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linux-user: Fixes for zero_bss
[mirror_qemu.git] / linux-user / elfload.c
1 /* This is the Linux kernel elf-loading code, ported into user space */
2 #include "qemu/osdep.h"
3 #include <sys/param.h>
4
5 #include <sys/resource.h>
6 #include <sys/shm.h>
7
8 #include "qemu.h"
9 #include "user-internals.h"
10 #include "signal-common.h"
11 #include "loader.h"
12 #include "user-mmap.h"
13 #include "disas/disas.h"
14 #include "qemu/bitops.h"
15 #include "qemu/path.h"
16 #include "qemu/queue.h"
17 #include "qemu/guest-random.h"
18 #include "qemu/units.h"
19 #include "qemu/selfmap.h"
20 #include "qemu/lockable.h"
21 #include "qapi/error.h"
22 #include "qemu/error-report.h"
23 #include "target_signal.h"
24 #include "accel/tcg/debuginfo.h"
25
26 #ifdef _ARCH_PPC64
27 #undef ARCH_DLINFO
28 #undef ELF_PLATFORM
29 #undef ELF_HWCAP
30 #undef ELF_HWCAP2
31 #undef ELF_CLASS
32 #undef ELF_DATA
33 #undef ELF_ARCH
34 #endif
35
36 #define ELF_OSABI ELFOSABI_SYSV
37
38 /* from personality.h */
39
40 /*
41 * Flags for bug emulation.
42 *
43 * These occupy the top three bytes.
44 */
45 enum {
46 ADDR_NO_RANDOMIZE = 0x0040000, /* disable randomization of VA space */
47 FDPIC_FUNCPTRS = 0x0080000, /* userspace function ptrs point to
48 descriptors (signal handling) */
49 MMAP_PAGE_ZERO = 0x0100000,
50 ADDR_COMPAT_LAYOUT = 0x0200000,
51 READ_IMPLIES_EXEC = 0x0400000,
52 ADDR_LIMIT_32BIT = 0x0800000,
53 SHORT_INODE = 0x1000000,
54 WHOLE_SECONDS = 0x2000000,
55 STICKY_TIMEOUTS = 0x4000000,
56 ADDR_LIMIT_3GB = 0x8000000,
57 };
58
59 /*
60 * Personality types.
61 *
62 * These go in the low byte. Avoid using the top bit, it will
63 * conflict with error returns.
64 */
65 enum {
66 PER_LINUX = 0x0000,
67 PER_LINUX_32BIT = 0x0000 | ADDR_LIMIT_32BIT,
68 PER_LINUX_FDPIC = 0x0000 | FDPIC_FUNCPTRS,
69 PER_SVR4 = 0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
70 PER_SVR3 = 0x0002 | STICKY_TIMEOUTS | SHORT_INODE,
71 PER_SCOSVR3 = 0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS | SHORT_INODE,
72 PER_OSR5 = 0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS,
73 PER_WYSEV386 = 0x0004 | STICKY_TIMEOUTS | SHORT_INODE,
74 PER_ISCR4 = 0x0005 | STICKY_TIMEOUTS,
75 PER_BSD = 0x0006,
76 PER_SUNOS = 0x0006 | STICKY_TIMEOUTS,
77 PER_XENIX = 0x0007 | STICKY_TIMEOUTS | SHORT_INODE,
78 PER_LINUX32 = 0x0008,
79 PER_LINUX32_3GB = 0x0008 | ADDR_LIMIT_3GB,
80 PER_IRIX32 = 0x0009 | STICKY_TIMEOUTS,/* IRIX5 32-bit */
81 PER_IRIXN32 = 0x000a | STICKY_TIMEOUTS,/* IRIX6 new 32-bit */
82 PER_IRIX64 = 0x000b | STICKY_TIMEOUTS,/* IRIX6 64-bit */
83 PER_RISCOS = 0x000c,
84 PER_SOLARIS = 0x000d | STICKY_TIMEOUTS,
85 PER_UW7 = 0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
86 PER_OSF4 = 0x000f, /* OSF/1 v4 */
87 PER_HPUX = 0x0010,
88 PER_MASK = 0x00ff,
89 };
90
91 /*
92 * Return the base personality without flags.
93 */
94 #define personality(pers) (pers & PER_MASK)
95
96 int info_is_fdpic(struct image_info *info)
97 {
98 return info->personality == PER_LINUX_FDPIC;
99 }
100
101 /* this flag is uneffective under linux too, should be deleted */
102 #ifndef MAP_DENYWRITE
103 #define MAP_DENYWRITE 0
104 #endif
105
106 /* should probably go in elf.h */
107 #ifndef ELIBBAD
108 #define ELIBBAD 80
109 #endif
110
111 #if TARGET_BIG_ENDIAN
112 #define ELF_DATA ELFDATA2MSB
113 #else
114 #define ELF_DATA ELFDATA2LSB
115 #endif
116
117 #ifdef TARGET_ABI_MIPSN32
118 typedef abi_ullong target_elf_greg_t;
119 #define tswapreg(ptr) tswap64(ptr)
120 #else
121 typedef abi_ulong target_elf_greg_t;
122 #define tswapreg(ptr) tswapal(ptr)
123 #endif
124
125 #ifdef USE_UID16
126 typedef abi_ushort target_uid_t;
127 typedef abi_ushort target_gid_t;
128 #else
129 typedef abi_uint target_uid_t;
130 typedef abi_uint target_gid_t;
131 #endif
132 typedef abi_int target_pid_t;
133
134 #ifdef TARGET_I386
135
136 #define ELF_HWCAP get_elf_hwcap()
137
138 static uint32_t get_elf_hwcap(void)
139 {
140 X86CPU *cpu = X86_CPU(thread_cpu);
141
142 return cpu->env.features[FEAT_1_EDX];
143 }
144
145 #ifdef TARGET_X86_64
146 #define ELF_CLASS ELFCLASS64
147 #define ELF_ARCH EM_X86_64
148
149 #define ELF_PLATFORM "x86_64"
150
151 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
152 {
153 regs->rax = 0;
154 regs->rsp = infop->start_stack;
155 regs->rip = infop->entry;
156 }
157
158 #define ELF_NREG 27
159 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
160
161 /*
162 * Note that ELF_NREG should be 29 as there should be place for
163 * TRAPNO and ERR "registers" as well but linux doesn't dump
164 * those.
165 *
166 * See linux kernel: arch/x86/include/asm/elf.h
167 */
168 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *env)
169 {
170 (*regs)[0] = tswapreg(env->regs[15]);
171 (*regs)[1] = tswapreg(env->regs[14]);
172 (*regs)[2] = tswapreg(env->regs[13]);
173 (*regs)[3] = tswapreg(env->regs[12]);
174 (*regs)[4] = tswapreg(env->regs[R_EBP]);
175 (*regs)[5] = tswapreg(env->regs[R_EBX]);
176 (*regs)[6] = tswapreg(env->regs[11]);
177 (*regs)[7] = tswapreg(env->regs[10]);
178 (*regs)[8] = tswapreg(env->regs[9]);
179 (*regs)[9] = tswapreg(env->regs[8]);
180 (*regs)[10] = tswapreg(env->regs[R_EAX]);
181 (*regs)[11] = tswapreg(env->regs[R_ECX]);
182 (*regs)[12] = tswapreg(env->regs[R_EDX]);
183 (*regs)[13] = tswapreg(env->regs[R_ESI]);
184 (*regs)[14] = tswapreg(env->regs[R_EDI]);
185 (*regs)[15] = tswapreg(env->regs[R_EAX]); /* XXX */
186 (*regs)[16] = tswapreg(env->eip);
187 (*regs)[17] = tswapreg(env->segs[R_CS].selector & 0xffff);
188 (*regs)[18] = tswapreg(env->eflags);
189 (*regs)[19] = tswapreg(env->regs[R_ESP]);
190 (*regs)[20] = tswapreg(env->segs[R_SS].selector & 0xffff);
191 (*regs)[21] = tswapreg(env->segs[R_FS].selector & 0xffff);
192 (*regs)[22] = tswapreg(env->segs[R_GS].selector & 0xffff);
193 (*regs)[23] = tswapreg(env->segs[R_DS].selector & 0xffff);
194 (*regs)[24] = tswapreg(env->segs[R_ES].selector & 0xffff);
195 (*regs)[25] = tswapreg(env->segs[R_FS].selector & 0xffff);
196 (*regs)[26] = tswapreg(env->segs[R_GS].selector & 0xffff);
197 }
198
199 #if ULONG_MAX > UINT32_MAX
200 #define INIT_GUEST_COMMPAGE
201 static bool init_guest_commpage(void)
202 {
203 /*
204 * The vsyscall page is at a high negative address aka kernel space,
205 * which means that we cannot actually allocate it with target_mmap.
206 * We still should be able to use page_set_flags, unless the user
207 * has specified -R reserved_va, which would trigger an assert().
208 */
209 if (reserved_va != 0 &&
210 TARGET_VSYSCALL_PAGE + TARGET_PAGE_SIZE - 1 > reserved_va) {
211 error_report("Cannot allocate vsyscall page");
212 exit(EXIT_FAILURE);
213 }
214 page_set_flags(TARGET_VSYSCALL_PAGE,
215 TARGET_VSYSCALL_PAGE | ~TARGET_PAGE_MASK,
216 PAGE_EXEC | PAGE_VALID);
217 return true;
218 }
219 #endif
220 #else
221
222 /*
223 * This is used to ensure we don't load something for the wrong architecture.
224 */
225 #define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) )
226
227 /*
228 * These are used to set parameters in the core dumps.
229 */
230 #define ELF_CLASS ELFCLASS32
231 #define ELF_ARCH EM_386
232
233 #define ELF_PLATFORM get_elf_platform()
234 #define EXSTACK_DEFAULT true
235
236 static const char *get_elf_platform(void)
237 {
238 static char elf_platform[] = "i386";
239 int family = object_property_get_int(OBJECT(thread_cpu), "family", NULL);
240 if (family > 6) {
241 family = 6;
242 }
243 if (family >= 3) {
244 elf_platform[1] = '0' + family;
245 }
246 return elf_platform;
247 }
248
249 static inline void init_thread(struct target_pt_regs *regs,
250 struct image_info *infop)
251 {
252 regs->esp = infop->start_stack;
253 regs->eip = infop->entry;
254
255 /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program
256 starts %edx contains a pointer to a function which might be
257 registered using `atexit'. This provides a mean for the
258 dynamic linker to call DT_FINI functions for shared libraries
259 that have been loaded before the code runs.
260
261 A value of 0 tells we have no such handler. */
262 regs->edx = 0;
263 }
264
265 #define ELF_NREG 17
266 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
267
268 /*
269 * Note that ELF_NREG should be 19 as there should be place for
270 * TRAPNO and ERR "registers" as well but linux doesn't dump
271 * those.
272 *
273 * See linux kernel: arch/x86/include/asm/elf.h
274 */
275 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *env)
276 {
277 (*regs)[0] = tswapreg(env->regs[R_EBX]);
278 (*regs)[1] = tswapreg(env->regs[R_ECX]);
279 (*regs)[2] = tswapreg(env->regs[R_EDX]);
280 (*regs)[3] = tswapreg(env->regs[R_ESI]);
281 (*regs)[4] = tswapreg(env->regs[R_EDI]);
282 (*regs)[5] = tswapreg(env->regs[R_EBP]);
283 (*regs)[6] = tswapreg(env->regs[R_EAX]);
284 (*regs)[7] = tswapreg(env->segs[R_DS].selector & 0xffff);
285 (*regs)[8] = tswapreg(env->segs[R_ES].selector & 0xffff);
286 (*regs)[9] = tswapreg(env->segs[R_FS].selector & 0xffff);
287 (*regs)[10] = tswapreg(env->segs[R_GS].selector & 0xffff);
288 (*regs)[11] = tswapreg(env->regs[R_EAX]); /* XXX */
289 (*regs)[12] = tswapreg(env->eip);
290 (*regs)[13] = tswapreg(env->segs[R_CS].selector & 0xffff);
291 (*regs)[14] = tswapreg(env->eflags);
292 (*regs)[15] = tswapreg(env->regs[R_ESP]);
293 (*regs)[16] = tswapreg(env->segs[R_SS].selector & 0xffff);
294 }
295 #endif
296
297 #define USE_ELF_CORE_DUMP
298 #define ELF_EXEC_PAGESIZE 4096
299
300 #endif
301
302 #ifdef TARGET_ARM
303
304 #ifndef TARGET_AARCH64
305 /* 32 bit ARM definitions */
306
307 #define ELF_ARCH EM_ARM
308 #define ELF_CLASS ELFCLASS32
309 #define EXSTACK_DEFAULT true
310
311 static inline void init_thread(struct target_pt_regs *regs,
312 struct image_info *infop)
313 {
314 abi_long stack = infop->start_stack;
315 memset(regs, 0, sizeof(*regs));
316
317 regs->uregs[16] = ARM_CPU_MODE_USR;
318 if (infop->entry & 1) {
319 regs->uregs[16] |= CPSR_T;
320 }
321 regs->uregs[15] = infop->entry & 0xfffffffe;
322 regs->uregs[13] = infop->start_stack;
323 /* FIXME - what to for failure of get_user()? */
324 get_user_ual(regs->uregs[2], stack + 8); /* envp */
325 get_user_ual(regs->uregs[1], stack + 4); /* envp */
326 /* XXX: it seems that r0 is zeroed after ! */
327 regs->uregs[0] = 0;
328 /* For uClinux PIC binaries. */
329 /* XXX: Linux does this only on ARM with no MMU (do we care ?) */
330 regs->uregs[10] = infop->start_data;
331
332 /* Support ARM FDPIC. */
333 if (info_is_fdpic(infop)) {
334 /* As described in the ABI document, r7 points to the loadmap info
335 * prepared by the kernel. If an interpreter is needed, r8 points
336 * to the interpreter loadmap and r9 points to the interpreter
337 * PT_DYNAMIC info. If no interpreter is needed, r8 is zero, and
338 * r9 points to the main program PT_DYNAMIC info.
339 */
340 regs->uregs[7] = infop->loadmap_addr;
341 if (infop->interpreter_loadmap_addr) {
342 /* Executable is dynamically loaded. */
343 regs->uregs[8] = infop->interpreter_loadmap_addr;
344 regs->uregs[9] = infop->interpreter_pt_dynamic_addr;
345 } else {
346 regs->uregs[8] = 0;
347 regs->uregs[9] = infop->pt_dynamic_addr;
348 }
349 }
350 }
351
352 #define ELF_NREG 18
353 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
354
355 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUARMState *env)
356 {
357 (*regs)[0] = tswapreg(env->regs[0]);
358 (*regs)[1] = tswapreg(env->regs[1]);
359 (*regs)[2] = tswapreg(env->regs[2]);
360 (*regs)[3] = tswapreg(env->regs[3]);
361 (*regs)[4] = tswapreg(env->regs[4]);
362 (*regs)[5] = tswapreg(env->regs[5]);
363 (*regs)[6] = tswapreg(env->regs[6]);
364 (*regs)[7] = tswapreg(env->regs[7]);
365 (*regs)[8] = tswapreg(env->regs[8]);
366 (*regs)[9] = tswapreg(env->regs[9]);
367 (*regs)[10] = tswapreg(env->regs[10]);
368 (*regs)[11] = tswapreg(env->regs[11]);
369 (*regs)[12] = tswapreg(env->regs[12]);
370 (*regs)[13] = tswapreg(env->regs[13]);
371 (*regs)[14] = tswapreg(env->regs[14]);
372 (*regs)[15] = tswapreg(env->regs[15]);
373
374 (*regs)[16] = tswapreg(cpsr_read((CPUARMState *)env));
375 (*regs)[17] = tswapreg(env->regs[0]); /* XXX */
376 }
377
378 #define USE_ELF_CORE_DUMP
379 #define ELF_EXEC_PAGESIZE 4096
380
381 enum
382 {
383 ARM_HWCAP_ARM_SWP = 1 << 0,
384 ARM_HWCAP_ARM_HALF = 1 << 1,
385 ARM_HWCAP_ARM_THUMB = 1 << 2,
386 ARM_HWCAP_ARM_26BIT = 1 << 3,
387 ARM_HWCAP_ARM_FAST_MULT = 1 << 4,
388 ARM_HWCAP_ARM_FPA = 1 << 5,
389 ARM_HWCAP_ARM_VFP = 1 << 6,
390 ARM_HWCAP_ARM_EDSP = 1 << 7,
391 ARM_HWCAP_ARM_JAVA = 1 << 8,
392 ARM_HWCAP_ARM_IWMMXT = 1 << 9,
393 ARM_HWCAP_ARM_CRUNCH = 1 << 10,
394 ARM_HWCAP_ARM_THUMBEE = 1 << 11,
395 ARM_HWCAP_ARM_NEON = 1 << 12,
396 ARM_HWCAP_ARM_VFPv3 = 1 << 13,
397 ARM_HWCAP_ARM_VFPv3D16 = 1 << 14,
398 ARM_HWCAP_ARM_TLS = 1 << 15,
399 ARM_HWCAP_ARM_VFPv4 = 1 << 16,
400 ARM_HWCAP_ARM_IDIVA = 1 << 17,
401 ARM_HWCAP_ARM_IDIVT = 1 << 18,
402 ARM_HWCAP_ARM_VFPD32 = 1 << 19,
403 ARM_HWCAP_ARM_LPAE = 1 << 20,
404 ARM_HWCAP_ARM_EVTSTRM = 1 << 21,
405 ARM_HWCAP_ARM_FPHP = 1 << 22,
406 ARM_HWCAP_ARM_ASIMDHP = 1 << 23,
407 ARM_HWCAP_ARM_ASIMDDP = 1 << 24,
408 ARM_HWCAP_ARM_ASIMDFHM = 1 << 25,
409 ARM_HWCAP_ARM_ASIMDBF16 = 1 << 26,
410 ARM_HWCAP_ARM_I8MM = 1 << 27,
411 };
412
413 enum {
414 ARM_HWCAP2_ARM_AES = 1 << 0,
415 ARM_HWCAP2_ARM_PMULL = 1 << 1,
416 ARM_HWCAP2_ARM_SHA1 = 1 << 2,
417 ARM_HWCAP2_ARM_SHA2 = 1 << 3,
418 ARM_HWCAP2_ARM_CRC32 = 1 << 4,
419 ARM_HWCAP2_ARM_SB = 1 << 5,
420 ARM_HWCAP2_ARM_SSBS = 1 << 6,
421 };
422
423 /* The commpage only exists for 32 bit kernels */
424
425 #define HI_COMMPAGE (intptr_t)0xffff0f00u
426
427 static bool init_guest_commpage(void)
428 {
429 ARMCPU *cpu = ARM_CPU(thread_cpu);
430 abi_ptr commpage;
431 void *want;
432 void *addr;
433
434 /*
435 * M-profile allocates maximum of 2GB address space, so can never
436 * allocate the commpage. Skip it.
437 */
438 if (arm_feature(&cpu->env, ARM_FEATURE_M)) {
439 return true;
440 }
441
442 commpage = HI_COMMPAGE & -qemu_host_page_size;
443 want = g2h_untagged(commpage);
444 addr = mmap(want, qemu_host_page_size, PROT_READ | PROT_WRITE,
445 MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
446
447 if (addr == MAP_FAILED) {
448 perror("Allocating guest commpage");
449 exit(EXIT_FAILURE);
450 }
451 if (addr != want) {
452 return false;
453 }
454
455 /* Set kernel helper versions; rest of page is 0. */
456 __put_user(5, (uint32_t *)g2h_untagged(0xffff0ffcu));
457
458 if (mprotect(addr, qemu_host_page_size, PROT_READ)) {
459 perror("Protecting guest commpage");
460 exit(EXIT_FAILURE);
461 }
462
463 page_set_flags(commpage, commpage | ~qemu_host_page_mask,
464 PAGE_READ | PAGE_EXEC | PAGE_VALID);
465 return true;
466 }
467
468 #define ELF_HWCAP get_elf_hwcap()
469 #define ELF_HWCAP2 get_elf_hwcap2()
470
471 uint32_t get_elf_hwcap(void)
472 {
473 ARMCPU *cpu = ARM_CPU(thread_cpu);
474 uint32_t hwcaps = 0;
475
476 hwcaps |= ARM_HWCAP_ARM_SWP;
477 hwcaps |= ARM_HWCAP_ARM_HALF;
478 hwcaps |= ARM_HWCAP_ARM_THUMB;
479 hwcaps |= ARM_HWCAP_ARM_FAST_MULT;
480
481 /* probe for the extra features */
482 #define GET_FEATURE(feat, hwcap) \
483 do { if (arm_feature(&cpu->env, feat)) { hwcaps |= hwcap; } } while (0)
484
485 #define GET_FEATURE_ID(feat, hwcap) \
486 do { if (cpu_isar_feature(feat, cpu)) { hwcaps |= hwcap; } } while (0)
487
488 /* EDSP is in v5TE and above, but all our v5 CPUs are v5TE */
489 GET_FEATURE(ARM_FEATURE_V5, ARM_HWCAP_ARM_EDSP);
490 GET_FEATURE(ARM_FEATURE_IWMMXT, ARM_HWCAP_ARM_IWMMXT);
491 GET_FEATURE(ARM_FEATURE_THUMB2EE, ARM_HWCAP_ARM_THUMBEE);
492 GET_FEATURE(ARM_FEATURE_NEON, ARM_HWCAP_ARM_NEON);
493 GET_FEATURE(ARM_FEATURE_V6K, ARM_HWCAP_ARM_TLS);
494 GET_FEATURE(ARM_FEATURE_LPAE, ARM_HWCAP_ARM_LPAE);
495 GET_FEATURE_ID(aa32_arm_div, ARM_HWCAP_ARM_IDIVA);
496 GET_FEATURE_ID(aa32_thumb_div, ARM_HWCAP_ARM_IDIVT);
497 GET_FEATURE_ID(aa32_vfp, ARM_HWCAP_ARM_VFP);
498
499 if (cpu_isar_feature(aa32_fpsp_v3, cpu) ||
500 cpu_isar_feature(aa32_fpdp_v3, cpu)) {
501 hwcaps |= ARM_HWCAP_ARM_VFPv3;
502 if (cpu_isar_feature(aa32_simd_r32, cpu)) {
503 hwcaps |= ARM_HWCAP_ARM_VFPD32;
504 } else {
505 hwcaps |= ARM_HWCAP_ARM_VFPv3D16;
506 }
507 }
508 GET_FEATURE_ID(aa32_simdfmac, ARM_HWCAP_ARM_VFPv4);
509 /*
510 * MVFR1.FPHP and .SIMDHP must be in sync, and QEMU uses the same
511 * isar_feature function for both. The kernel reports them as two hwcaps.
512 */
513 GET_FEATURE_ID(aa32_fp16_arith, ARM_HWCAP_ARM_FPHP);
514 GET_FEATURE_ID(aa32_fp16_arith, ARM_HWCAP_ARM_ASIMDHP);
515 GET_FEATURE_ID(aa32_dp, ARM_HWCAP_ARM_ASIMDDP);
516 GET_FEATURE_ID(aa32_fhm, ARM_HWCAP_ARM_ASIMDFHM);
517 GET_FEATURE_ID(aa32_bf16, ARM_HWCAP_ARM_ASIMDBF16);
518 GET_FEATURE_ID(aa32_i8mm, ARM_HWCAP_ARM_I8MM);
519
520 return hwcaps;
521 }
522
523 uint32_t get_elf_hwcap2(void)
524 {
525 ARMCPU *cpu = ARM_CPU(thread_cpu);
526 uint32_t hwcaps = 0;
527
528 GET_FEATURE_ID(aa32_aes, ARM_HWCAP2_ARM_AES);
529 GET_FEATURE_ID(aa32_pmull, ARM_HWCAP2_ARM_PMULL);
530 GET_FEATURE_ID(aa32_sha1, ARM_HWCAP2_ARM_SHA1);
531 GET_FEATURE_ID(aa32_sha2, ARM_HWCAP2_ARM_SHA2);
532 GET_FEATURE_ID(aa32_crc32, ARM_HWCAP2_ARM_CRC32);
533 GET_FEATURE_ID(aa32_sb, ARM_HWCAP2_ARM_SB);
534 GET_FEATURE_ID(aa32_ssbs, ARM_HWCAP2_ARM_SSBS);
535 return hwcaps;
536 }
537
538 const char *elf_hwcap_str(uint32_t bit)
539 {
540 static const char *hwcap_str[] = {
541 [__builtin_ctz(ARM_HWCAP_ARM_SWP )] = "swp",
542 [__builtin_ctz(ARM_HWCAP_ARM_HALF )] = "half",
543 [__builtin_ctz(ARM_HWCAP_ARM_THUMB )] = "thumb",
544 [__builtin_ctz(ARM_HWCAP_ARM_26BIT )] = "26bit",
545 [__builtin_ctz(ARM_HWCAP_ARM_FAST_MULT)] = "fast_mult",
546 [__builtin_ctz(ARM_HWCAP_ARM_FPA )] = "fpa",
547 [__builtin_ctz(ARM_HWCAP_ARM_VFP )] = "vfp",
548 [__builtin_ctz(ARM_HWCAP_ARM_EDSP )] = "edsp",
549 [__builtin_ctz(ARM_HWCAP_ARM_JAVA )] = "java",
550 [__builtin_ctz(ARM_HWCAP_ARM_IWMMXT )] = "iwmmxt",
551 [__builtin_ctz(ARM_HWCAP_ARM_CRUNCH )] = "crunch",
552 [__builtin_ctz(ARM_HWCAP_ARM_THUMBEE )] = "thumbee",
553 [__builtin_ctz(ARM_HWCAP_ARM_NEON )] = "neon",
554 [__builtin_ctz(ARM_HWCAP_ARM_VFPv3 )] = "vfpv3",
555 [__builtin_ctz(ARM_HWCAP_ARM_VFPv3D16 )] = "vfpv3d16",
556 [__builtin_ctz(ARM_HWCAP_ARM_TLS )] = "tls",
557 [__builtin_ctz(ARM_HWCAP_ARM_VFPv4 )] = "vfpv4",
558 [__builtin_ctz(ARM_HWCAP_ARM_IDIVA )] = "idiva",
559 [__builtin_ctz(ARM_HWCAP_ARM_IDIVT )] = "idivt",
560 [__builtin_ctz(ARM_HWCAP_ARM_VFPD32 )] = "vfpd32",
561 [__builtin_ctz(ARM_HWCAP_ARM_LPAE )] = "lpae",
562 [__builtin_ctz(ARM_HWCAP_ARM_EVTSTRM )] = "evtstrm",
563 [__builtin_ctz(ARM_HWCAP_ARM_FPHP )] = "fphp",
564 [__builtin_ctz(ARM_HWCAP_ARM_ASIMDHP )] = "asimdhp",
565 [__builtin_ctz(ARM_HWCAP_ARM_ASIMDDP )] = "asimddp",
566 [__builtin_ctz(ARM_HWCAP_ARM_ASIMDFHM )] = "asimdfhm",
567 [__builtin_ctz(ARM_HWCAP_ARM_ASIMDBF16)] = "asimdbf16",
568 [__builtin_ctz(ARM_HWCAP_ARM_I8MM )] = "i8mm",
569 };
570
571 return bit < ARRAY_SIZE(hwcap_str) ? hwcap_str[bit] : NULL;
572 }
573
574 const char *elf_hwcap2_str(uint32_t bit)
575 {
576 static const char *hwcap_str[] = {
577 [__builtin_ctz(ARM_HWCAP2_ARM_AES )] = "aes",
578 [__builtin_ctz(ARM_HWCAP2_ARM_PMULL)] = "pmull",
579 [__builtin_ctz(ARM_HWCAP2_ARM_SHA1 )] = "sha1",
580 [__builtin_ctz(ARM_HWCAP2_ARM_SHA2 )] = "sha2",
581 [__builtin_ctz(ARM_HWCAP2_ARM_CRC32)] = "crc32",
582 [__builtin_ctz(ARM_HWCAP2_ARM_SB )] = "sb",
583 [__builtin_ctz(ARM_HWCAP2_ARM_SSBS )] = "ssbs",
584 };
585
586 return bit < ARRAY_SIZE(hwcap_str) ? hwcap_str[bit] : NULL;
587 }
588
589 #undef GET_FEATURE
590 #undef GET_FEATURE_ID
591
592 #define ELF_PLATFORM get_elf_platform()
593
594 static const char *get_elf_platform(void)
595 {
596 CPUARMState *env = cpu_env(thread_cpu);
597
598 #if TARGET_BIG_ENDIAN
599 # define END "b"
600 #else
601 # define END "l"
602 #endif
603
604 if (arm_feature(env, ARM_FEATURE_V8)) {
605 return "v8" END;
606 } else if (arm_feature(env, ARM_FEATURE_V7)) {
607 if (arm_feature(env, ARM_FEATURE_M)) {
608 return "v7m" END;
609 } else {
610 return "v7" END;
611 }
612 } else if (arm_feature(env, ARM_FEATURE_V6)) {
613 return "v6" END;
614 } else if (arm_feature(env, ARM_FEATURE_V5)) {
615 return "v5" END;
616 } else {
617 return "v4" END;
618 }
619
620 #undef END
621 }
622
623 #else
624 /* 64 bit ARM definitions */
625
626 #define ELF_ARCH EM_AARCH64
627 #define ELF_CLASS ELFCLASS64
628 #if TARGET_BIG_ENDIAN
629 # define ELF_PLATFORM "aarch64_be"
630 #else
631 # define ELF_PLATFORM "aarch64"
632 #endif
633
634 static inline void init_thread(struct target_pt_regs *regs,
635 struct image_info *infop)
636 {
637 abi_long stack = infop->start_stack;
638 memset(regs, 0, sizeof(*regs));
639
640 regs->pc = infop->entry & ~0x3ULL;
641 regs->sp = stack;
642 }
643
644 #define ELF_NREG 34
645 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
646
647 static void elf_core_copy_regs(target_elf_gregset_t *regs,
648 const CPUARMState *env)
649 {
650 int i;
651
652 for (i = 0; i < 32; i++) {
653 (*regs)[i] = tswapreg(env->xregs[i]);
654 }
655 (*regs)[32] = tswapreg(env->pc);
656 (*regs)[33] = tswapreg(pstate_read((CPUARMState *)env));
657 }
658
659 #define USE_ELF_CORE_DUMP
660 #define ELF_EXEC_PAGESIZE 4096
661
662 enum {
663 ARM_HWCAP_A64_FP = 1 << 0,
664 ARM_HWCAP_A64_ASIMD = 1 << 1,
665 ARM_HWCAP_A64_EVTSTRM = 1 << 2,
666 ARM_HWCAP_A64_AES = 1 << 3,
667 ARM_HWCAP_A64_PMULL = 1 << 4,
668 ARM_HWCAP_A64_SHA1 = 1 << 5,
669 ARM_HWCAP_A64_SHA2 = 1 << 6,
670 ARM_HWCAP_A64_CRC32 = 1 << 7,
671 ARM_HWCAP_A64_ATOMICS = 1 << 8,
672 ARM_HWCAP_A64_FPHP = 1 << 9,
673 ARM_HWCAP_A64_ASIMDHP = 1 << 10,
674 ARM_HWCAP_A64_CPUID = 1 << 11,
675 ARM_HWCAP_A64_ASIMDRDM = 1 << 12,
676 ARM_HWCAP_A64_JSCVT = 1 << 13,
677 ARM_HWCAP_A64_FCMA = 1 << 14,
678 ARM_HWCAP_A64_LRCPC = 1 << 15,
679 ARM_HWCAP_A64_DCPOP = 1 << 16,
680 ARM_HWCAP_A64_SHA3 = 1 << 17,
681 ARM_HWCAP_A64_SM3 = 1 << 18,
682 ARM_HWCAP_A64_SM4 = 1 << 19,
683 ARM_HWCAP_A64_ASIMDDP = 1 << 20,
684 ARM_HWCAP_A64_SHA512 = 1 << 21,
685 ARM_HWCAP_A64_SVE = 1 << 22,
686 ARM_HWCAP_A64_ASIMDFHM = 1 << 23,
687 ARM_HWCAP_A64_DIT = 1 << 24,
688 ARM_HWCAP_A64_USCAT = 1 << 25,
689 ARM_HWCAP_A64_ILRCPC = 1 << 26,
690 ARM_HWCAP_A64_FLAGM = 1 << 27,
691 ARM_HWCAP_A64_SSBS = 1 << 28,
692 ARM_HWCAP_A64_SB = 1 << 29,
693 ARM_HWCAP_A64_PACA = 1 << 30,
694 ARM_HWCAP_A64_PACG = 1UL << 31,
695
696 ARM_HWCAP2_A64_DCPODP = 1 << 0,
697 ARM_HWCAP2_A64_SVE2 = 1 << 1,
698 ARM_HWCAP2_A64_SVEAES = 1 << 2,
699 ARM_HWCAP2_A64_SVEPMULL = 1 << 3,
700 ARM_HWCAP2_A64_SVEBITPERM = 1 << 4,
701 ARM_HWCAP2_A64_SVESHA3 = 1 << 5,
702 ARM_HWCAP2_A64_SVESM4 = 1 << 6,
703 ARM_HWCAP2_A64_FLAGM2 = 1 << 7,
704 ARM_HWCAP2_A64_FRINT = 1 << 8,
705 ARM_HWCAP2_A64_SVEI8MM = 1 << 9,
706 ARM_HWCAP2_A64_SVEF32MM = 1 << 10,
707 ARM_HWCAP2_A64_SVEF64MM = 1 << 11,
708 ARM_HWCAP2_A64_SVEBF16 = 1 << 12,
709 ARM_HWCAP2_A64_I8MM = 1 << 13,
710 ARM_HWCAP2_A64_BF16 = 1 << 14,
711 ARM_HWCAP2_A64_DGH = 1 << 15,
712 ARM_HWCAP2_A64_RNG = 1 << 16,
713 ARM_HWCAP2_A64_BTI = 1 << 17,
714 ARM_HWCAP2_A64_MTE = 1 << 18,
715 ARM_HWCAP2_A64_ECV = 1 << 19,
716 ARM_HWCAP2_A64_AFP = 1 << 20,
717 ARM_HWCAP2_A64_RPRES = 1 << 21,
718 ARM_HWCAP2_A64_MTE3 = 1 << 22,
719 ARM_HWCAP2_A64_SME = 1 << 23,
720 ARM_HWCAP2_A64_SME_I16I64 = 1 << 24,
721 ARM_HWCAP2_A64_SME_F64F64 = 1 << 25,
722 ARM_HWCAP2_A64_SME_I8I32 = 1 << 26,
723 ARM_HWCAP2_A64_SME_F16F32 = 1 << 27,
724 ARM_HWCAP2_A64_SME_B16F32 = 1 << 28,
725 ARM_HWCAP2_A64_SME_F32F32 = 1 << 29,
726 ARM_HWCAP2_A64_SME_FA64 = 1 << 30,
727 ARM_HWCAP2_A64_WFXT = 1ULL << 31,
728 ARM_HWCAP2_A64_EBF16 = 1ULL << 32,
729 ARM_HWCAP2_A64_SVE_EBF16 = 1ULL << 33,
730 ARM_HWCAP2_A64_CSSC = 1ULL << 34,
731 ARM_HWCAP2_A64_RPRFM = 1ULL << 35,
732 ARM_HWCAP2_A64_SVE2P1 = 1ULL << 36,
733 ARM_HWCAP2_A64_SME2 = 1ULL << 37,
734 ARM_HWCAP2_A64_SME2P1 = 1ULL << 38,
735 ARM_HWCAP2_A64_SME_I16I32 = 1ULL << 39,
736 ARM_HWCAP2_A64_SME_BI32I32 = 1ULL << 40,
737 ARM_HWCAP2_A64_SME_B16B16 = 1ULL << 41,
738 ARM_HWCAP2_A64_SME_F16F16 = 1ULL << 42,
739 ARM_HWCAP2_A64_MOPS = 1ULL << 43,
740 ARM_HWCAP2_A64_HBC = 1ULL << 44,
741 };
742
743 #define ELF_HWCAP get_elf_hwcap()
744 #define ELF_HWCAP2 get_elf_hwcap2()
745
746 #define GET_FEATURE_ID(feat, hwcap) \
747 do { if (cpu_isar_feature(feat, cpu)) { hwcaps |= hwcap; } } while (0)
748
749 uint32_t get_elf_hwcap(void)
750 {
751 ARMCPU *cpu = ARM_CPU(thread_cpu);
752 uint32_t hwcaps = 0;
753
754 hwcaps |= ARM_HWCAP_A64_FP;
755 hwcaps |= ARM_HWCAP_A64_ASIMD;
756 hwcaps |= ARM_HWCAP_A64_CPUID;
757
758 /* probe for the extra features */
759
760 GET_FEATURE_ID(aa64_aes, ARM_HWCAP_A64_AES);
761 GET_FEATURE_ID(aa64_pmull, ARM_HWCAP_A64_PMULL);
762 GET_FEATURE_ID(aa64_sha1, ARM_HWCAP_A64_SHA1);
763 GET_FEATURE_ID(aa64_sha256, ARM_HWCAP_A64_SHA2);
764 GET_FEATURE_ID(aa64_sha512, ARM_HWCAP_A64_SHA512);
765 GET_FEATURE_ID(aa64_crc32, ARM_HWCAP_A64_CRC32);
766 GET_FEATURE_ID(aa64_sha3, ARM_HWCAP_A64_SHA3);
767 GET_FEATURE_ID(aa64_sm3, ARM_HWCAP_A64_SM3);
768 GET_FEATURE_ID(aa64_sm4, ARM_HWCAP_A64_SM4);
769 GET_FEATURE_ID(aa64_fp16, ARM_HWCAP_A64_FPHP | ARM_HWCAP_A64_ASIMDHP);
770 GET_FEATURE_ID(aa64_atomics, ARM_HWCAP_A64_ATOMICS);
771 GET_FEATURE_ID(aa64_rdm, ARM_HWCAP_A64_ASIMDRDM);
772 GET_FEATURE_ID(aa64_dp, ARM_HWCAP_A64_ASIMDDP);
773 GET_FEATURE_ID(aa64_fcma, ARM_HWCAP_A64_FCMA);
774 GET_FEATURE_ID(aa64_sve, ARM_HWCAP_A64_SVE);
775 GET_FEATURE_ID(aa64_pauth, ARM_HWCAP_A64_PACA | ARM_HWCAP_A64_PACG);
776 GET_FEATURE_ID(aa64_fhm, ARM_HWCAP_A64_ASIMDFHM);
777 GET_FEATURE_ID(aa64_jscvt, ARM_HWCAP_A64_JSCVT);
778 GET_FEATURE_ID(aa64_sb, ARM_HWCAP_A64_SB);
779 GET_FEATURE_ID(aa64_condm_4, ARM_HWCAP_A64_FLAGM);
780 GET_FEATURE_ID(aa64_dcpop, ARM_HWCAP_A64_DCPOP);
781 GET_FEATURE_ID(aa64_rcpc_8_3, ARM_HWCAP_A64_LRCPC);
782 GET_FEATURE_ID(aa64_rcpc_8_4, ARM_HWCAP_A64_ILRCPC);
783
784 return hwcaps;
785 }
786
787 uint32_t get_elf_hwcap2(void)
788 {
789 ARMCPU *cpu = ARM_CPU(thread_cpu);
790 uint32_t hwcaps = 0;
791
792 GET_FEATURE_ID(aa64_dcpodp, ARM_HWCAP2_A64_DCPODP);
793 GET_FEATURE_ID(aa64_sve2, ARM_HWCAP2_A64_SVE2);
794 GET_FEATURE_ID(aa64_sve2_aes, ARM_HWCAP2_A64_SVEAES);
795 GET_FEATURE_ID(aa64_sve2_pmull128, ARM_HWCAP2_A64_SVEPMULL);
796 GET_FEATURE_ID(aa64_sve2_bitperm, ARM_HWCAP2_A64_SVEBITPERM);
797 GET_FEATURE_ID(aa64_sve2_sha3, ARM_HWCAP2_A64_SVESHA3);
798 GET_FEATURE_ID(aa64_sve2_sm4, ARM_HWCAP2_A64_SVESM4);
799 GET_FEATURE_ID(aa64_condm_5, ARM_HWCAP2_A64_FLAGM2);
800 GET_FEATURE_ID(aa64_frint, ARM_HWCAP2_A64_FRINT);
801 GET_FEATURE_ID(aa64_sve_i8mm, ARM_HWCAP2_A64_SVEI8MM);
802 GET_FEATURE_ID(aa64_sve_f32mm, ARM_HWCAP2_A64_SVEF32MM);
803 GET_FEATURE_ID(aa64_sve_f64mm, ARM_HWCAP2_A64_SVEF64MM);
804 GET_FEATURE_ID(aa64_sve_bf16, ARM_HWCAP2_A64_SVEBF16);
805 GET_FEATURE_ID(aa64_i8mm, ARM_HWCAP2_A64_I8MM);
806 GET_FEATURE_ID(aa64_bf16, ARM_HWCAP2_A64_BF16);
807 GET_FEATURE_ID(aa64_rndr, ARM_HWCAP2_A64_RNG);
808 GET_FEATURE_ID(aa64_bti, ARM_HWCAP2_A64_BTI);
809 GET_FEATURE_ID(aa64_mte, ARM_HWCAP2_A64_MTE);
810 GET_FEATURE_ID(aa64_sme, (ARM_HWCAP2_A64_SME |
811 ARM_HWCAP2_A64_SME_F32F32 |
812 ARM_HWCAP2_A64_SME_B16F32 |
813 ARM_HWCAP2_A64_SME_F16F32 |
814 ARM_HWCAP2_A64_SME_I8I32));
815 GET_FEATURE_ID(aa64_sme_f64f64, ARM_HWCAP2_A64_SME_F64F64);
816 GET_FEATURE_ID(aa64_sme_i16i64, ARM_HWCAP2_A64_SME_I16I64);
817 GET_FEATURE_ID(aa64_sme_fa64, ARM_HWCAP2_A64_SME_FA64);
818 GET_FEATURE_ID(aa64_hbc, ARM_HWCAP2_A64_HBC);
819 GET_FEATURE_ID(aa64_mops, ARM_HWCAP2_A64_MOPS);
820
821 return hwcaps;
822 }
823
824 const char *elf_hwcap_str(uint32_t bit)
825 {
826 static const char *hwcap_str[] = {
827 [__builtin_ctz(ARM_HWCAP_A64_FP )] = "fp",
828 [__builtin_ctz(ARM_HWCAP_A64_ASIMD )] = "asimd",
829 [__builtin_ctz(ARM_HWCAP_A64_EVTSTRM )] = "evtstrm",
830 [__builtin_ctz(ARM_HWCAP_A64_AES )] = "aes",
831 [__builtin_ctz(ARM_HWCAP_A64_PMULL )] = "pmull",
832 [__builtin_ctz(ARM_HWCAP_A64_SHA1 )] = "sha1",
833 [__builtin_ctz(ARM_HWCAP_A64_SHA2 )] = "sha2",
834 [__builtin_ctz(ARM_HWCAP_A64_CRC32 )] = "crc32",
835 [__builtin_ctz(ARM_HWCAP_A64_ATOMICS )] = "atomics",
836 [__builtin_ctz(ARM_HWCAP_A64_FPHP )] = "fphp",
837 [__builtin_ctz(ARM_HWCAP_A64_ASIMDHP )] = "asimdhp",
838 [__builtin_ctz(ARM_HWCAP_A64_CPUID )] = "cpuid",
839 [__builtin_ctz(ARM_HWCAP_A64_ASIMDRDM)] = "asimdrdm",
840 [__builtin_ctz(ARM_HWCAP_A64_JSCVT )] = "jscvt",
841 [__builtin_ctz(ARM_HWCAP_A64_FCMA )] = "fcma",
842 [__builtin_ctz(ARM_HWCAP_A64_LRCPC )] = "lrcpc",
843 [__builtin_ctz(ARM_HWCAP_A64_DCPOP )] = "dcpop",
844 [__builtin_ctz(ARM_HWCAP_A64_SHA3 )] = "sha3",
845 [__builtin_ctz(ARM_HWCAP_A64_SM3 )] = "sm3",
846 [__builtin_ctz(ARM_HWCAP_A64_SM4 )] = "sm4",
847 [__builtin_ctz(ARM_HWCAP_A64_ASIMDDP )] = "asimddp",
848 [__builtin_ctz(ARM_HWCAP_A64_SHA512 )] = "sha512",
849 [__builtin_ctz(ARM_HWCAP_A64_SVE )] = "sve",
850 [__builtin_ctz(ARM_HWCAP_A64_ASIMDFHM)] = "asimdfhm",
851 [__builtin_ctz(ARM_HWCAP_A64_DIT )] = "dit",
852 [__builtin_ctz(ARM_HWCAP_A64_USCAT )] = "uscat",
853 [__builtin_ctz(ARM_HWCAP_A64_ILRCPC )] = "ilrcpc",
854 [__builtin_ctz(ARM_HWCAP_A64_FLAGM )] = "flagm",
855 [__builtin_ctz(ARM_HWCAP_A64_SSBS )] = "ssbs",
856 [__builtin_ctz(ARM_HWCAP_A64_SB )] = "sb",
857 [__builtin_ctz(ARM_HWCAP_A64_PACA )] = "paca",
858 [__builtin_ctz(ARM_HWCAP_A64_PACG )] = "pacg",
859 };
860
861 return bit < ARRAY_SIZE(hwcap_str) ? hwcap_str[bit] : NULL;
862 }
863
864 const char *elf_hwcap2_str(uint32_t bit)
865 {
866 static const char *hwcap_str[] = {
867 [__builtin_ctz(ARM_HWCAP2_A64_DCPODP )] = "dcpodp",
868 [__builtin_ctz(ARM_HWCAP2_A64_SVE2 )] = "sve2",
869 [__builtin_ctz(ARM_HWCAP2_A64_SVEAES )] = "sveaes",
870 [__builtin_ctz(ARM_HWCAP2_A64_SVEPMULL )] = "svepmull",
871 [__builtin_ctz(ARM_HWCAP2_A64_SVEBITPERM )] = "svebitperm",
872 [__builtin_ctz(ARM_HWCAP2_A64_SVESHA3 )] = "svesha3",
873 [__builtin_ctz(ARM_HWCAP2_A64_SVESM4 )] = "svesm4",
874 [__builtin_ctz(ARM_HWCAP2_A64_FLAGM2 )] = "flagm2",
875 [__builtin_ctz(ARM_HWCAP2_A64_FRINT )] = "frint",
876 [__builtin_ctz(ARM_HWCAP2_A64_SVEI8MM )] = "svei8mm",
877 [__builtin_ctz(ARM_HWCAP2_A64_SVEF32MM )] = "svef32mm",
878 [__builtin_ctz(ARM_HWCAP2_A64_SVEF64MM )] = "svef64mm",
879 [__builtin_ctz(ARM_HWCAP2_A64_SVEBF16 )] = "svebf16",
880 [__builtin_ctz(ARM_HWCAP2_A64_I8MM )] = "i8mm",
881 [__builtin_ctz(ARM_HWCAP2_A64_BF16 )] = "bf16",
882 [__builtin_ctz(ARM_HWCAP2_A64_DGH )] = "dgh",
883 [__builtin_ctz(ARM_HWCAP2_A64_RNG )] = "rng",
884 [__builtin_ctz(ARM_HWCAP2_A64_BTI )] = "bti",
885 [__builtin_ctz(ARM_HWCAP2_A64_MTE )] = "mte",
886 [__builtin_ctz(ARM_HWCAP2_A64_ECV )] = "ecv",
887 [__builtin_ctz(ARM_HWCAP2_A64_AFP )] = "afp",
888 [__builtin_ctz(ARM_HWCAP2_A64_RPRES )] = "rpres",
889 [__builtin_ctz(ARM_HWCAP2_A64_MTE3 )] = "mte3",
890 [__builtin_ctz(ARM_HWCAP2_A64_SME )] = "sme",
891 [__builtin_ctz(ARM_HWCAP2_A64_SME_I16I64 )] = "smei16i64",
892 [__builtin_ctz(ARM_HWCAP2_A64_SME_F64F64 )] = "smef64f64",
893 [__builtin_ctz(ARM_HWCAP2_A64_SME_I8I32 )] = "smei8i32",
894 [__builtin_ctz(ARM_HWCAP2_A64_SME_F16F32 )] = "smef16f32",
895 [__builtin_ctz(ARM_HWCAP2_A64_SME_B16F32 )] = "smeb16f32",
896 [__builtin_ctz(ARM_HWCAP2_A64_SME_F32F32 )] = "smef32f32",
897 [__builtin_ctz(ARM_HWCAP2_A64_SME_FA64 )] = "smefa64",
898 [__builtin_ctz(ARM_HWCAP2_A64_WFXT )] = "wfxt",
899 [__builtin_ctzll(ARM_HWCAP2_A64_EBF16 )] = "ebf16",
900 [__builtin_ctzll(ARM_HWCAP2_A64_SVE_EBF16 )] = "sveebf16",
901 [__builtin_ctzll(ARM_HWCAP2_A64_CSSC )] = "cssc",
902 [__builtin_ctzll(ARM_HWCAP2_A64_RPRFM )] = "rprfm",
903 [__builtin_ctzll(ARM_HWCAP2_A64_SVE2P1 )] = "sve2p1",
904 [__builtin_ctzll(ARM_HWCAP2_A64_SME2 )] = "sme2",
905 [__builtin_ctzll(ARM_HWCAP2_A64_SME2P1 )] = "sme2p1",
906 [__builtin_ctzll(ARM_HWCAP2_A64_SME_I16I32 )] = "smei16i32",
907 [__builtin_ctzll(ARM_HWCAP2_A64_SME_BI32I32)] = "smebi32i32",
908 [__builtin_ctzll(ARM_HWCAP2_A64_SME_B16B16 )] = "smeb16b16",
909 [__builtin_ctzll(ARM_HWCAP2_A64_SME_F16F16 )] = "smef16f16",
910 [__builtin_ctzll(ARM_HWCAP2_A64_MOPS )] = "mops",
911 [__builtin_ctzll(ARM_HWCAP2_A64_HBC )] = "hbc",
912 };
913
914 return bit < ARRAY_SIZE(hwcap_str) ? hwcap_str[bit] : NULL;
915 }
916
917 #undef GET_FEATURE_ID
918
919 #endif /* not TARGET_AARCH64 */
920 #endif /* TARGET_ARM */
921
922 #ifdef TARGET_SPARC
923 #ifdef TARGET_SPARC64
924
925 #define ELF_HWCAP (HWCAP_SPARC_FLUSH | HWCAP_SPARC_STBAR | HWCAP_SPARC_SWAP \
926 | HWCAP_SPARC_MULDIV | HWCAP_SPARC_V9)
927 #ifndef TARGET_ABI32
928 #define elf_check_arch(x) ( (x) == EM_SPARCV9 || (x) == EM_SPARC32PLUS )
929 #else
930 #define elf_check_arch(x) ( (x) == EM_SPARC32PLUS || (x) == EM_SPARC )
931 #endif
932
933 #define ELF_CLASS ELFCLASS64
934 #define ELF_ARCH EM_SPARCV9
935 #else
936 #define ELF_HWCAP (HWCAP_SPARC_FLUSH | HWCAP_SPARC_STBAR | HWCAP_SPARC_SWAP \
937 | HWCAP_SPARC_MULDIV)
938 #define ELF_CLASS ELFCLASS32
939 #define ELF_ARCH EM_SPARC
940 #endif /* TARGET_SPARC64 */
941
942 static inline void init_thread(struct target_pt_regs *regs,
943 struct image_info *infop)
944 {
945 /* Note that target_cpu_copy_regs does not read psr/tstate. */
946 regs->pc = infop->entry;
947 regs->npc = regs->pc + 4;
948 regs->y = 0;
949 regs->u_regs[14] = (infop->start_stack - 16 * sizeof(abi_ulong)
950 - TARGET_STACK_BIAS);
951 }
952 #endif /* TARGET_SPARC */
953
954 #ifdef TARGET_PPC
955
956 #define ELF_MACHINE PPC_ELF_MACHINE
957
958 #if defined(TARGET_PPC64)
959
960 #define elf_check_arch(x) ( (x) == EM_PPC64 )
961
962 #define ELF_CLASS ELFCLASS64
963
964 #else
965
966 #define ELF_CLASS ELFCLASS32
967 #define EXSTACK_DEFAULT true
968
969 #endif
970
971 #define ELF_ARCH EM_PPC
972
973 /* Feature masks for the Aux Vector Hardware Capabilities (AT_HWCAP).
974 See arch/powerpc/include/asm/cputable.h. */
975 enum {
976 QEMU_PPC_FEATURE_32 = 0x80000000,
977 QEMU_PPC_FEATURE_64 = 0x40000000,
978 QEMU_PPC_FEATURE_601_INSTR = 0x20000000,
979 QEMU_PPC_FEATURE_HAS_ALTIVEC = 0x10000000,
980 QEMU_PPC_FEATURE_HAS_FPU = 0x08000000,
981 QEMU_PPC_FEATURE_HAS_MMU = 0x04000000,
982 QEMU_PPC_FEATURE_HAS_4xxMAC = 0x02000000,
983 QEMU_PPC_FEATURE_UNIFIED_CACHE = 0x01000000,
984 QEMU_PPC_FEATURE_HAS_SPE = 0x00800000,
985 QEMU_PPC_FEATURE_HAS_EFP_SINGLE = 0x00400000,
986 QEMU_PPC_FEATURE_HAS_EFP_DOUBLE = 0x00200000,
987 QEMU_PPC_FEATURE_NO_TB = 0x00100000,
988 QEMU_PPC_FEATURE_POWER4 = 0x00080000,
989 QEMU_PPC_FEATURE_POWER5 = 0x00040000,
990 QEMU_PPC_FEATURE_POWER5_PLUS = 0x00020000,
991 QEMU_PPC_FEATURE_CELL = 0x00010000,
992 QEMU_PPC_FEATURE_BOOKE = 0x00008000,
993 QEMU_PPC_FEATURE_SMT = 0x00004000,
994 QEMU_PPC_FEATURE_ICACHE_SNOOP = 0x00002000,
995 QEMU_PPC_FEATURE_ARCH_2_05 = 0x00001000,
996 QEMU_PPC_FEATURE_PA6T = 0x00000800,
997 QEMU_PPC_FEATURE_HAS_DFP = 0x00000400,
998 QEMU_PPC_FEATURE_POWER6_EXT = 0x00000200,
999 QEMU_PPC_FEATURE_ARCH_2_06 = 0x00000100,
1000 QEMU_PPC_FEATURE_HAS_VSX = 0x00000080,
1001 QEMU_PPC_FEATURE_PSERIES_PERFMON_COMPAT = 0x00000040,
1002
1003 QEMU_PPC_FEATURE_TRUE_LE = 0x00000002,
1004 QEMU_PPC_FEATURE_PPC_LE = 0x00000001,
1005
1006 /* Feature definitions in AT_HWCAP2. */
1007 QEMU_PPC_FEATURE2_ARCH_2_07 = 0x80000000, /* ISA 2.07 */
1008 QEMU_PPC_FEATURE2_HAS_HTM = 0x40000000, /* Hardware Transactional Memory */
1009 QEMU_PPC_FEATURE2_HAS_DSCR = 0x20000000, /* Data Stream Control Register */
1010 QEMU_PPC_FEATURE2_HAS_EBB = 0x10000000, /* Event Base Branching */
1011 QEMU_PPC_FEATURE2_HAS_ISEL = 0x08000000, /* Integer Select */
1012 QEMU_PPC_FEATURE2_HAS_TAR = 0x04000000, /* Target Address Register */
1013 QEMU_PPC_FEATURE2_VEC_CRYPTO = 0x02000000,
1014 QEMU_PPC_FEATURE2_HTM_NOSC = 0x01000000,
1015 QEMU_PPC_FEATURE2_ARCH_3_00 = 0x00800000, /* ISA 3.00 */
1016 QEMU_PPC_FEATURE2_HAS_IEEE128 = 0x00400000, /* VSX IEEE Bin Float 128-bit */
1017 QEMU_PPC_FEATURE2_DARN = 0x00200000, /* darn random number insn */
1018 QEMU_PPC_FEATURE2_SCV = 0x00100000, /* scv syscall */
1019 QEMU_PPC_FEATURE2_HTM_NO_SUSPEND = 0x00080000, /* TM w/o suspended state */
1020 QEMU_PPC_FEATURE2_ARCH_3_1 = 0x00040000, /* ISA 3.1 */
1021 QEMU_PPC_FEATURE2_MMA = 0x00020000, /* Matrix-Multiply Assist */
1022 };
1023
1024 #define ELF_HWCAP get_elf_hwcap()
1025
1026 static uint32_t get_elf_hwcap(void)
1027 {
1028 PowerPCCPU *cpu = POWERPC_CPU(thread_cpu);
1029 uint32_t features = 0;
1030
1031 /* We don't have to be terribly complete here; the high points are
1032 Altivec/FP/SPE support. Anything else is just a bonus. */
1033 #define GET_FEATURE(flag, feature) \
1034 do { if (cpu->env.insns_flags & flag) { features |= feature; } } while (0)
1035 #define GET_FEATURE2(flags, feature) \
1036 do { \
1037 if ((cpu->env.insns_flags2 & flags) == flags) { \
1038 features |= feature; \
1039 } \
1040 } while (0)
1041 GET_FEATURE(PPC_64B, QEMU_PPC_FEATURE_64);
1042 GET_FEATURE(PPC_FLOAT, QEMU_PPC_FEATURE_HAS_FPU);
1043 GET_FEATURE(PPC_ALTIVEC, QEMU_PPC_FEATURE_HAS_ALTIVEC);
1044 GET_FEATURE(PPC_SPE, QEMU_PPC_FEATURE_HAS_SPE);
1045 GET_FEATURE(PPC_SPE_SINGLE, QEMU_PPC_FEATURE_HAS_EFP_SINGLE);
1046 GET_FEATURE(PPC_SPE_DOUBLE, QEMU_PPC_FEATURE_HAS_EFP_DOUBLE);
1047 GET_FEATURE(PPC_BOOKE, QEMU_PPC_FEATURE_BOOKE);
1048 GET_FEATURE(PPC_405_MAC, QEMU_PPC_FEATURE_HAS_4xxMAC);
1049 GET_FEATURE2(PPC2_DFP, QEMU_PPC_FEATURE_HAS_DFP);
1050 GET_FEATURE2(PPC2_VSX, QEMU_PPC_FEATURE_HAS_VSX);
1051 GET_FEATURE2((PPC2_PERM_ISA206 | PPC2_DIVE_ISA206 | PPC2_ATOMIC_ISA206 |
1052 PPC2_FP_CVT_ISA206 | PPC2_FP_TST_ISA206),
1053 QEMU_PPC_FEATURE_ARCH_2_06);
1054 #undef GET_FEATURE
1055 #undef GET_FEATURE2
1056
1057 return features;
1058 }
1059
1060 #define ELF_HWCAP2 get_elf_hwcap2()
1061
1062 static uint32_t get_elf_hwcap2(void)
1063 {
1064 PowerPCCPU *cpu = POWERPC_CPU(thread_cpu);
1065 uint32_t features = 0;
1066
1067 #define GET_FEATURE(flag, feature) \
1068 do { if (cpu->env.insns_flags & flag) { features |= feature; } } while (0)
1069 #define GET_FEATURE2(flag, feature) \
1070 do { if (cpu->env.insns_flags2 & flag) { features |= feature; } } while (0)
1071
1072 GET_FEATURE(PPC_ISEL, QEMU_PPC_FEATURE2_HAS_ISEL);
1073 GET_FEATURE2(PPC2_BCTAR_ISA207, QEMU_PPC_FEATURE2_HAS_TAR);
1074 GET_FEATURE2((PPC2_BCTAR_ISA207 | PPC2_LSQ_ISA207 | PPC2_ALTIVEC_207 |
1075 PPC2_ISA207S), QEMU_PPC_FEATURE2_ARCH_2_07 |
1076 QEMU_PPC_FEATURE2_VEC_CRYPTO);
1077 GET_FEATURE2(PPC2_ISA300, QEMU_PPC_FEATURE2_ARCH_3_00 |
1078 QEMU_PPC_FEATURE2_DARN | QEMU_PPC_FEATURE2_HAS_IEEE128);
1079 GET_FEATURE2(PPC2_ISA310, QEMU_PPC_FEATURE2_ARCH_3_1 |
1080 QEMU_PPC_FEATURE2_MMA);
1081
1082 #undef GET_FEATURE
1083 #undef GET_FEATURE2
1084
1085 return features;
1086 }
1087
1088 /*
1089 * The requirements here are:
1090 * - keep the final alignment of sp (sp & 0xf)
1091 * - make sure the 32-bit value at the first 16 byte aligned position of
1092 * AUXV is greater than 16 for glibc compatibility.
1093 * AT_IGNOREPPC is used for that.
1094 * - for compatibility with glibc ARCH_DLINFO must always be defined on PPC,
1095 * even if DLINFO_ARCH_ITEMS goes to zero or is undefined.
1096 */
1097 #define DLINFO_ARCH_ITEMS 5
1098 #define ARCH_DLINFO \
1099 do { \
1100 PowerPCCPU *cpu = POWERPC_CPU(thread_cpu); \
1101 /* \
1102 * Handle glibc compatibility: these magic entries must \
1103 * be at the lowest addresses in the final auxv. \
1104 */ \
1105 NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \
1106 NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \
1107 NEW_AUX_ENT(AT_DCACHEBSIZE, cpu->env.dcache_line_size); \
1108 NEW_AUX_ENT(AT_ICACHEBSIZE, cpu->env.icache_line_size); \
1109 NEW_AUX_ENT(AT_UCACHEBSIZE, 0); \
1110 } while (0)
1111
1112 static inline void init_thread(struct target_pt_regs *_regs, struct image_info *infop)
1113 {
1114 _regs->gpr[1] = infop->start_stack;
1115 #if defined(TARGET_PPC64)
1116 if (get_ppc64_abi(infop) < 2) {
1117 uint64_t val;
1118 get_user_u64(val, infop->entry + 8);
1119 _regs->gpr[2] = val + infop->load_bias;
1120 get_user_u64(val, infop->entry);
1121 infop->entry = val + infop->load_bias;
1122 } else {
1123 _regs->gpr[12] = infop->entry; /* r12 set to global entry address */
1124 }
1125 #endif
1126 _regs->nip = infop->entry;
1127 }
1128
1129 /* See linux kernel: arch/powerpc/include/asm/elf.h. */
1130 #define ELF_NREG 48
1131 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1132
1133 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUPPCState *env)
1134 {
1135 int i;
1136 target_ulong ccr = 0;
1137
1138 for (i = 0; i < ARRAY_SIZE(env->gpr); i++) {
1139 (*regs)[i] = tswapreg(env->gpr[i]);
1140 }
1141
1142 (*regs)[32] = tswapreg(env->nip);
1143 (*regs)[33] = tswapreg(env->msr);
1144 (*regs)[35] = tswapreg(env->ctr);
1145 (*regs)[36] = tswapreg(env->lr);
1146 (*regs)[37] = tswapreg(cpu_read_xer(env));
1147
1148 ccr = ppc_get_cr(env);
1149 (*regs)[38] = tswapreg(ccr);
1150 }
1151
1152 #define USE_ELF_CORE_DUMP
1153 #define ELF_EXEC_PAGESIZE 4096
1154
1155 #endif
1156
1157 #ifdef TARGET_LOONGARCH64
1158
1159 #define ELF_CLASS ELFCLASS64
1160 #define ELF_ARCH EM_LOONGARCH
1161 #define EXSTACK_DEFAULT true
1162
1163 #define elf_check_arch(x) ((x) == EM_LOONGARCH)
1164
1165 static inline void init_thread(struct target_pt_regs *regs,
1166 struct image_info *infop)
1167 {
1168 /*Set crmd PG,DA = 1,0 */
1169 regs->csr.crmd = 2 << 3;
1170 regs->csr.era = infop->entry;
1171 regs->regs[3] = infop->start_stack;
1172 }
1173
1174 /* See linux kernel: arch/loongarch/include/asm/elf.h */
1175 #define ELF_NREG 45
1176 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1177
1178 enum {
1179 TARGET_EF_R0 = 0,
1180 TARGET_EF_CSR_ERA = TARGET_EF_R0 + 33,
1181 TARGET_EF_CSR_BADV = TARGET_EF_R0 + 34,
1182 };
1183
1184 static void elf_core_copy_regs(target_elf_gregset_t *regs,
1185 const CPULoongArchState *env)
1186 {
1187 int i;
1188
1189 (*regs)[TARGET_EF_R0] = 0;
1190
1191 for (i = 1; i < ARRAY_SIZE(env->gpr); i++) {
1192 (*regs)[TARGET_EF_R0 + i] = tswapreg(env->gpr[i]);
1193 }
1194
1195 (*regs)[TARGET_EF_CSR_ERA] = tswapreg(env->pc);
1196 (*regs)[TARGET_EF_CSR_BADV] = tswapreg(env->CSR_BADV);
1197 }
1198
1199 #define USE_ELF_CORE_DUMP
1200 #define ELF_EXEC_PAGESIZE 4096
1201
1202 #define ELF_HWCAP get_elf_hwcap()
1203
1204 /* See arch/loongarch/include/uapi/asm/hwcap.h */
1205 enum {
1206 HWCAP_LOONGARCH_CPUCFG = (1 << 0),
1207 HWCAP_LOONGARCH_LAM = (1 << 1),
1208 HWCAP_LOONGARCH_UAL = (1 << 2),
1209 HWCAP_LOONGARCH_FPU = (1 << 3),
1210 HWCAP_LOONGARCH_LSX = (1 << 4),
1211 HWCAP_LOONGARCH_LASX = (1 << 5),
1212 HWCAP_LOONGARCH_CRC32 = (1 << 6),
1213 HWCAP_LOONGARCH_COMPLEX = (1 << 7),
1214 HWCAP_LOONGARCH_CRYPTO = (1 << 8),
1215 HWCAP_LOONGARCH_LVZ = (1 << 9),
1216 HWCAP_LOONGARCH_LBT_X86 = (1 << 10),
1217 HWCAP_LOONGARCH_LBT_ARM = (1 << 11),
1218 HWCAP_LOONGARCH_LBT_MIPS = (1 << 12),
1219 };
1220
1221 static uint32_t get_elf_hwcap(void)
1222 {
1223 LoongArchCPU *cpu = LOONGARCH_CPU(thread_cpu);
1224 uint32_t hwcaps = 0;
1225
1226 hwcaps |= HWCAP_LOONGARCH_CRC32;
1227
1228 if (FIELD_EX32(cpu->env.cpucfg[1], CPUCFG1, UAL)) {
1229 hwcaps |= HWCAP_LOONGARCH_UAL;
1230 }
1231
1232 if (FIELD_EX32(cpu->env.cpucfg[2], CPUCFG2, FP)) {
1233 hwcaps |= HWCAP_LOONGARCH_FPU;
1234 }
1235
1236 if (FIELD_EX32(cpu->env.cpucfg[2], CPUCFG2, LAM)) {
1237 hwcaps |= HWCAP_LOONGARCH_LAM;
1238 }
1239
1240 return hwcaps;
1241 }
1242
1243 #define ELF_PLATFORM "loongarch"
1244
1245 #endif /* TARGET_LOONGARCH64 */
1246
1247 #ifdef TARGET_MIPS
1248
1249 #ifdef TARGET_MIPS64
1250 #define ELF_CLASS ELFCLASS64
1251 #else
1252 #define ELF_CLASS ELFCLASS32
1253 #endif
1254 #define ELF_ARCH EM_MIPS
1255 #define EXSTACK_DEFAULT true
1256
1257 #ifdef TARGET_ABI_MIPSN32
1258 #define elf_check_abi(x) ((x) & EF_MIPS_ABI2)
1259 #else
1260 #define elf_check_abi(x) (!((x) & EF_MIPS_ABI2))
1261 #endif
1262
1263 #define ELF_BASE_PLATFORM get_elf_base_platform()
1264
1265 #define MATCH_PLATFORM_INSN(_flags, _base_platform) \
1266 do { if ((cpu->env.insn_flags & (_flags)) == _flags) \
1267 { return _base_platform; } } while (0)
1268
1269 static const char *get_elf_base_platform(void)
1270 {
1271 MIPSCPU *cpu = MIPS_CPU(thread_cpu);
1272
1273 /* 64 bit ISAs goes first */
1274 MATCH_PLATFORM_INSN(CPU_MIPS64R6, "mips64r6");
1275 MATCH_PLATFORM_INSN(CPU_MIPS64R5, "mips64r5");
1276 MATCH_PLATFORM_INSN(CPU_MIPS64R2, "mips64r2");
1277 MATCH_PLATFORM_INSN(CPU_MIPS64R1, "mips64");
1278 MATCH_PLATFORM_INSN(CPU_MIPS5, "mips5");
1279 MATCH_PLATFORM_INSN(CPU_MIPS4, "mips4");
1280 MATCH_PLATFORM_INSN(CPU_MIPS3, "mips3");
1281
1282 /* 32 bit ISAs */
1283 MATCH_PLATFORM_INSN(CPU_MIPS32R6, "mips32r6");
1284 MATCH_PLATFORM_INSN(CPU_MIPS32R5, "mips32r5");
1285 MATCH_PLATFORM_INSN(CPU_MIPS32R2, "mips32r2");
1286 MATCH_PLATFORM_INSN(CPU_MIPS32R1, "mips32");
1287 MATCH_PLATFORM_INSN(CPU_MIPS2, "mips2");
1288
1289 /* Fallback */
1290 return "mips";
1291 }
1292 #undef MATCH_PLATFORM_INSN
1293
1294 static inline void init_thread(struct target_pt_regs *regs,
1295 struct image_info *infop)
1296 {
1297 regs->cp0_status = 2 << CP0St_KSU;
1298 regs->cp0_epc = infop->entry;
1299 regs->regs[29] = infop->start_stack;
1300 }
1301
1302 /* See linux kernel: arch/mips/include/asm/elf.h. */
1303 #define ELF_NREG 45
1304 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1305
1306 /* See linux kernel: arch/mips/include/asm/reg.h. */
1307 enum {
1308 #ifdef TARGET_MIPS64
1309 TARGET_EF_R0 = 0,
1310 #else
1311 TARGET_EF_R0 = 6,
1312 #endif
1313 TARGET_EF_R26 = TARGET_EF_R0 + 26,
1314 TARGET_EF_R27 = TARGET_EF_R0 + 27,
1315 TARGET_EF_LO = TARGET_EF_R0 + 32,
1316 TARGET_EF_HI = TARGET_EF_R0 + 33,
1317 TARGET_EF_CP0_EPC = TARGET_EF_R0 + 34,
1318 TARGET_EF_CP0_BADVADDR = TARGET_EF_R0 + 35,
1319 TARGET_EF_CP0_STATUS = TARGET_EF_R0 + 36,
1320 TARGET_EF_CP0_CAUSE = TARGET_EF_R0 + 37
1321 };
1322
1323 /* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs. */
1324 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUMIPSState *env)
1325 {
1326 int i;
1327
1328 for (i = 0; i < TARGET_EF_R0; i++) {
1329 (*regs)[i] = 0;
1330 }
1331 (*regs)[TARGET_EF_R0] = 0;
1332
1333 for (i = 1; i < ARRAY_SIZE(env->active_tc.gpr); i++) {
1334 (*regs)[TARGET_EF_R0 + i] = tswapreg(env->active_tc.gpr[i]);
1335 }
1336
1337 (*regs)[TARGET_EF_R26] = 0;
1338 (*regs)[TARGET_EF_R27] = 0;
1339 (*regs)[TARGET_EF_LO] = tswapreg(env->active_tc.LO[0]);
1340 (*regs)[TARGET_EF_HI] = tswapreg(env->active_tc.HI[0]);
1341 (*regs)[TARGET_EF_CP0_EPC] = tswapreg(env->active_tc.PC);
1342 (*regs)[TARGET_EF_CP0_BADVADDR] = tswapreg(env->CP0_BadVAddr);
1343 (*regs)[TARGET_EF_CP0_STATUS] = tswapreg(env->CP0_Status);
1344 (*regs)[TARGET_EF_CP0_CAUSE] = tswapreg(env->CP0_Cause);
1345 }
1346
1347 #define USE_ELF_CORE_DUMP
1348 #define ELF_EXEC_PAGESIZE 4096
1349
1350 /* See arch/mips/include/uapi/asm/hwcap.h. */
1351 enum {
1352 HWCAP_MIPS_R6 = (1 << 0),
1353 HWCAP_MIPS_MSA = (1 << 1),
1354 HWCAP_MIPS_CRC32 = (1 << 2),
1355 HWCAP_MIPS_MIPS16 = (1 << 3),
1356 HWCAP_MIPS_MDMX = (1 << 4),
1357 HWCAP_MIPS_MIPS3D = (1 << 5),
1358 HWCAP_MIPS_SMARTMIPS = (1 << 6),
1359 HWCAP_MIPS_DSP = (1 << 7),
1360 HWCAP_MIPS_DSP2 = (1 << 8),
1361 HWCAP_MIPS_DSP3 = (1 << 9),
1362 HWCAP_MIPS_MIPS16E2 = (1 << 10),
1363 HWCAP_LOONGSON_MMI = (1 << 11),
1364 HWCAP_LOONGSON_EXT = (1 << 12),
1365 HWCAP_LOONGSON_EXT2 = (1 << 13),
1366 HWCAP_LOONGSON_CPUCFG = (1 << 14),
1367 };
1368
1369 #define ELF_HWCAP get_elf_hwcap()
1370
1371 #define GET_FEATURE_INSN(_flag, _hwcap) \
1372 do { if (cpu->env.insn_flags & (_flag)) { hwcaps |= _hwcap; } } while (0)
1373
1374 #define GET_FEATURE_REG_SET(_reg, _mask, _hwcap) \
1375 do { if (cpu->env._reg & (_mask)) { hwcaps |= _hwcap; } } while (0)
1376
1377 #define GET_FEATURE_REG_EQU(_reg, _start, _length, _val, _hwcap) \
1378 do { \
1379 if (extract32(cpu->env._reg, (_start), (_length)) == (_val)) { \
1380 hwcaps |= _hwcap; \
1381 } \
1382 } while (0)
1383
1384 static uint32_t get_elf_hwcap(void)
1385 {
1386 MIPSCPU *cpu = MIPS_CPU(thread_cpu);
1387 uint32_t hwcaps = 0;
1388
1389 GET_FEATURE_REG_EQU(CP0_Config0, CP0C0_AR, CP0C0_AR_LENGTH,
1390 2, HWCAP_MIPS_R6);
1391 GET_FEATURE_REG_SET(CP0_Config3, 1 << CP0C3_MSAP, HWCAP_MIPS_MSA);
1392 GET_FEATURE_INSN(ASE_LMMI, HWCAP_LOONGSON_MMI);
1393 GET_FEATURE_INSN(ASE_LEXT, HWCAP_LOONGSON_EXT);
1394
1395 return hwcaps;
1396 }
1397
1398 #undef GET_FEATURE_REG_EQU
1399 #undef GET_FEATURE_REG_SET
1400 #undef GET_FEATURE_INSN
1401
1402 #endif /* TARGET_MIPS */
1403
1404 #ifdef TARGET_MICROBLAZE
1405
1406 #define elf_check_arch(x) ( (x) == EM_MICROBLAZE || (x) == EM_MICROBLAZE_OLD)
1407
1408 #define ELF_CLASS ELFCLASS32
1409 #define ELF_ARCH EM_MICROBLAZE
1410
1411 static inline void init_thread(struct target_pt_regs *regs,
1412 struct image_info *infop)
1413 {
1414 regs->pc = infop->entry;
1415 regs->r1 = infop->start_stack;
1416
1417 }
1418
1419 #define ELF_EXEC_PAGESIZE 4096
1420
1421 #define USE_ELF_CORE_DUMP
1422 #define ELF_NREG 38
1423 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1424
1425 /* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs. */
1426 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUMBState *env)
1427 {
1428 int i, pos = 0;
1429
1430 for (i = 0; i < 32; i++) {
1431 (*regs)[pos++] = tswapreg(env->regs[i]);
1432 }
1433
1434 (*regs)[pos++] = tswapreg(env->pc);
1435 (*regs)[pos++] = tswapreg(mb_cpu_read_msr(env));
1436 (*regs)[pos++] = 0;
1437 (*regs)[pos++] = tswapreg(env->ear);
1438 (*regs)[pos++] = 0;
1439 (*regs)[pos++] = tswapreg(env->esr);
1440 }
1441
1442 #endif /* TARGET_MICROBLAZE */
1443
1444 #ifdef TARGET_NIOS2
1445
1446 #define elf_check_arch(x) ((x) == EM_ALTERA_NIOS2)
1447
1448 #define ELF_CLASS ELFCLASS32
1449 #define ELF_ARCH EM_ALTERA_NIOS2
1450
1451 static void init_thread(struct target_pt_regs *regs, struct image_info *infop)
1452 {
1453 regs->ea = infop->entry;
1454 regs->sp = infop->start_stack;
1455 }
1456
1457 #define LO_COMMPAGE TARGET_PAGE_SIZE
1458
1459 static bool init_guest_commpage(void)
1460 {
1461 static const uint8_t kuser_page[4 + 2 * 64] = {
1462 /* __kuser_helper_version */
1463 [0x00] = 0x02, 0x00, 0x00, 0x00,
1464
1465 /* __kuser_cmpxchg */
1466 [0x04] = 0x3a, 0x6c, 0x3b, 0x00, /* trap 16 */
1467 0x3a, 0x28, 0x00, 0xf8, /* ret */
1468
1469 /* __kuser_sigtramp */
1470 [0x44] = 0xc4, 0x22, 0x80, 0x00, /* movi r2, __NR_rt_sigreturn */
1471 0x3a, 0x68, 0x3b, 0x00, /* trap 0 */
1472 };
1473
1474 void *want = g2h_untagged(LO_COMMPAGE & -qemu_host_page_size);
1475 void *addr = mmap(want, qemu_host_page_size, PROT_READ | PROT_WRITE,
1476 MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
1477
1478 if (addr == MAP_FAILED) {
1479 perror("Allocating guest commpage");
1480 exit(EXIT_FAILURE);
1481 }
1482 if (addr != want) {
1483 return false;
1484 }
1485
1486 memcpy(addr, kuser_page, sizeof(kuser_page));
1487
1488 if (mprotect(addr, qemu_host_page_size, PROT_READ)) {
1489 perror("Protecting guest commpage");
1490 exit(EXIT_FAILURE);
1491 }
1492
1493 page_set_flags(LO_COMMPAGE, LO_COMMPAGE | ~TARGET_PAGE_MASK,
1494 PAGE_READ | PAGE_EXEC | PAGE_VALID);
1495 return true;
1496 }
1497
1498 #define ELF_EXEC_PAGESIZE 4096
1499
1500 #define USE_ELF_CORE_DUMP
1501 #define ELF_NREG 49
1502 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1503
1504 /* See linux kernel: arch/mips/kernel/process.c:elf_dump_regs. */
1505 static void elf_core_copy_regs(target_elf_gregset_t *regs,
1506 const CPUNios2State *env)
1507 {
1508 int i;
1509
1510 (*regs)[0] = -1;
1511 for (i = 1; i < 8; i++) /* r0-r7 */
1512 (*regs)[i] = tswapreg(env->regs[i + 7]);
1513
1514 for (i = 8; i < 16; i++) /* r8-r15 */
1515 (*regs)[i] = tswapreg(env->regs[i - 8]);
1516
1517 for (i = 16; i < 24; i++) /* r16-r23 */
1518 (*regs)[i] = tswapreg(env->regs[i + 7]);
1519 (*regs)[24] = -1; /* R_ET */
1520 (*regs)[25] = -1; /* R_BT */
1521 (*regs)[26] = tswapreg(env->regs[R_GP]);
1522 (*regs)[27] = tswapreg(env->regs[R_SP]);
1523 (*regs)[28] = tswapreg(env->regs[R_FP]);
1524 (*regs)[29] = tswapreg(env->regs[R_EA]);
1525 (*regs)[30] = -1; /* R_SSTATUS */
1526 (*regs)[31] = tswapreg(env->regs[R_RA]);
1527
1528 (*regs)[32] = tswapreg(env->pc);
1529
1530 (*regs)[33] = -1; /* R_STATUS */
1531 (*regs)[34] = tswapreg(env->regs[CR_ESTATUS]);
1532
1533 for (i = 35; i < 49; i++) /* ... */
1534 (*regs)[i] = -1;
1535 }
1536
1537 #endif /* TARGET_NIOS2 */
1538
1539 #ifdef TARGET_OPENRISC
1540
1541 #define ELF_ARCH EM_OPENRISC
1542 #define ELF_CLASS ELFCLASS32
1543 #define ELF_DATA ELFDATA2MSB
1544
1545 static inline void init_thread(struct target_pt_regs *regs,
1546 struct image_info *infop)
1547 {
1548 regs->pc = infop->entry;
1549 regs->gpr[1] = infop->start_stack;
1550 }
1551
1552 #define USE_ELF_CORE_DUMP
1553 #define ELF_EXEC_PAGESIZE 8192
1554
1555 /* See linux kernel arch/openrisc/include/asm/elf.h. */
1556 #define ELF_NREG 34 /* gprs and pc, sr */
1557 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1558
1559 static void elf_core_copy_regs(target_elf_gregset_t *regs,
1560 const CPUOpenRISCState *env)
1561 {
1562 int i;
1563
1564 for (i = 0; i < 32; i++) {
1565 (*regs)[i] = tswapreg(cpu_get_gpr(env, i));
1566 }
1567 (*regs)[32] = tswapreg(env->pc);
1568 (*regs)[33] = tswapreg(cpu_get_sr(env));
1569 }
1570 #define ELF_HWCAP 0
1571 #define ELF_PLATFORM NULL
1572
1573 #endif /* TARGET_OPENRISC */
1574
1575 #ifdef TARGET_SH4
1576
1577 #define ELF_CLASS ELFCLASS32
1578 #define ELF_ARCH EM_SH
1579
1580 static inline void init_thread(struct target_pt_regs *regs,
1581 struct image_info *infop)
1582 {
1583 /* Check other registers XXXXX */
1584 regs->pc = infop->entry;
1585 regs->regs[15] = infop->start_stack;
1586 }
1587
1588 /* See linux kernel: arch/sh/include/asm/elf.h. */
1589 #define ELF_NREG 23
1590 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1591
1592 /* See linux kernel: arch/sh/include/asm/ptrace.h. */
1593 enum {
1594 TARGET_REG_PC = 16,
1595 TARGET_REG_PR = 17,
1596 TARGET_REG_SR = 18,
1597 TARGET_REG_GBR = 19,
1598 TARGET_REG_MACH = 20,
1599 TARGET_REG_MACL = 21,
1600 TARGET_REG_SYSCALL = 22
1601 };
1602
1603 static inline void elf_core_copy_regs(target_elf_gregset_t *regs,
1604 const CPUSH4State *env)
1605 {
1606 int i;
1607
1608 for (i = 0; i < 16; i++) {
1609 (*regs)[i] = tswapreg(env->gregs[i]);
1610 }
1611
1612 (*regs)[TARGET_REG_PC] = tswapreg(env->pc);
1613 (*regs)[TARGET_REG_PR] = tswapreg(env->pr);
1614 (*regs)[TARGET_REG_SR] = tswapreg(env->sr);
1615 (*regs)[TARGET_REG_GBR] = tswapreg(env->gbr);
1616 (*regs)[TARGET_REG_MACH] = tswapreg(env->mach);
1617 (*regs)[TARGET_REG_MACL] = tswapreg(env->macl);
1618 (*regs)[TARGET_REG_SYSCALL] = 0; /* FIXME */
1619 }
1620
1621 #define USE_ELF_CORE_DUMP
1622 #define ELF_EXEC_PAGESIZE 4096
1623
1624 enum {
1625 SH_CPU_HAS_FPU = 0x0001, /* Hardware FPU support */
1626 SH_CPU_HAS_P2_FLUSH_BUG = 0x0002, /* Need to flush the cache in P2 area */
1627 SH_CPU_HAS_MMU_PAGE_ASSOC = 0x0004, /* SH3: TLB way selection bit support */
1628 SH_CPU_HAS_DSP = 0x0008, /* SH-DSP: DSP support */
1629 SH_CPU_HAS_PERF_COUNTER = 0x0010, /* Hardware performance counters */
1630 SH_CPU_HAS_PTEA = 0x0020, /* PTEA register */
1631 SH_CPU_HAS_LLSC = 0x0040, /* movli.l/movco.l */
1632 SH_CPU_HAS_L2_CACHE = 0x0080, /* Secondary cache / URAM */
1633 SH_CPU_HAS_OP32 = 0x0100, /* 32-bit instruction support */
1634 SH_CPU_HAS_PTEAEX = 0x0200, /* PTE ASID Extension support */
1635 };
1636
1637 #define ELF_HWCAP get_elf_hwcap()
1638
1639 static uint32_t get_elf_hwcap(void)
1640 {
1641 SuperHCPU *cpu = SUPERH_CPU(thread_cpu);
1642 uint32_t hwcap = 0;
1643
1644 hwcap |= SH_CPU_HAS_FPU;
1645
1646 if (cpu->env.features & SH_FEATURE_SH4A) {
1647 hwcap |= SH_CPU_HAS_LLSC;
1648 }
1649
1650 return hwcap;
1651 }
1652
1653 #endif
1654
1655 #ifdef TARGET_CRIS
1656
1657 #define ELF_CLASS ELFCLASS32
1658 #define ELF_ARCH EM_CRIS
1659
1660 static inline void init_thread(struct target_pt_regs *regs,
1661 struct image_info *infop)
1662 {
1663 regs->erp = infop->entry;
1664 }
1665
1666 #define ELF_EXEC_PAGESIZE 8192
1667
1668 #endif
1669
1670 #ifdef TARGET_M68K
1671
1672 #define ELF_CLASS ELFCLASS32
1673 #define ELF_ARCH EM_68K
1674
1675 /* ??? Does this need to do anything?
1676 #define ELF_PLAT_INIT(_r) */
1677
1678 static inline void init_thread(struct target_pt_regs *regs,
1679 struct image_info *infop)
1680 {
1681 regs->usp = infop->start_stack;
1682 regs->sr = 0;
1683 regs->pc = infop->entry;
1684 }
1685
1686 /* See linux kernel: arch/m68k/include/asm/elf.h. */
1687 #define ELF_NREG 20
1688 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1689
1690 static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUM68KState *env)
1691 {
1692 (*regs)[0] = tswapreg(env->dregs[1]);
1693 (*regs)[1] = tswapreg(env->dregs[2]);
1694 (*regs)[2] = tswapreg(env->dregs[3]);
1695 (*regs)[3] = tswapreg(env->dregs[4]);
1696 (*regs)[4] = tswapreg(env->dregs[5]);
1697 (*regs)[5] = tswapreg(env->dregs[6]);
1698 (*regs)[6] = tswapreg(env->dregs[7]);
1699 (*regs)[7] = tswapreg(env->aregs[0]);
1700 (*regs)[8] = tswapreg(env->aregs[1]);
1701 (*regs)[9] = tswapreg(env->aregs[2]);
1702 (*regs)[10] = tswapreg(env->aregs[3]);
1703 (*regs)[11] = tswapreg(env->aregs[4]);
1704 (*regs)[12] = tswapreg(env->aregs[5]);
1705 (*regs)[13] = tswapreg(env->aregs[6]);
1706 (*regs)[14] = tswapreg(env->dregs[0]);
1707 (*regs)[15] = tswapreg(env->aregs[7]);
1708 (*regs)[16] = tswapreg(env->dregs[0]); /* FIXME: orig_d0 */
1709 (*regs)[17] = tswapreg(env->sr);
1710 (*regs)[18] = tswapreg(env->pc);
1711 (*regs)[19] = 0; /* FIXME: regs->format | regs->vector */
1712 }
1713
1714 #define USE_ELF_CORE_DUMP
1715 #define ELF_EXEC_PAGESIZE 8192
1716
1717 #endif
1718
1719 #ifdef TARGET_ALPHA
1720
1721 #define ELF_CLASS ELFCLASS64
1722 #define ELF_ARCH EM_ALPHA
1723
1724 static inline void init_thread(struct target_pt_regs *regs,
1725 struct image_info *infop)
1726 {
1727 regs->pc = infop->entry;
1728 regs->ps = 8;
1729 regs->usp = infop->start_stack;
1730 }
1731
1732 #define ELF_EXEC_PAGESIZE 8192
1733
1734 #endif /* TARGET_ALPHA */
1735
1736 #ifdef TARGET_S390X
1737
1738 #define ELF_CLASS ELFCLASS64
1739 #define ELF_DATA ELFDATA2MSB
1740 #define ELF_ARCH EM_S390
1741
1742 #include "elf.h"
1743
1744 #define ELF_HWCAP get_elf_hwcap()
1745
1746 #define GET_FEATURE(_feat, _hwcap) \
1747 do { if (s390_has_feat(_feat)) { hwcap |= _hwcap; } } while (0)
1748
1749 uint32_t get_elf_hwcap(void)
1750 {
1751 /*
1752 * Let's assume we always have esan3 and zarch.
1753 * 31-bit processes can use 64-bit registers (high gprs).
1754 */
1755 uint32_t hwcap = HWCAP_S390_ESAN3 | HWCAP_S390_ZARCH | HWCAP_S390_HIGH_GPRS;
1756
1757 GET_FEATURE(S390_FEAT_STFLE, HWCAP_S390_STFLE);
1758 GET_FEATURE(S390_FEAT_MSA, HWCAP_S390_MSA);
1759 GET_FEATURE(S390_FEAT_LONG_DISPLACEMENT, HWCAP_S390_LDISP);
1760 GET_FEATURE(S390_FEAT_EXTENDED_IMMEDIATE, HWCAP_S390_EIMM);
1761 if (s390_has_feat(S390_FEAT_EXTENDED_TRANSLATION_3) &&
1762 s390_has_feat(S390_FEAT_ETF3_ENH)) {
1763 hwcap |= HWCAP_S390_ETF3EH;
1764 }
1765 GET_FEATURE(S390_FEAT_VECTOR, HWCAP_S390_VXRS);
1766 GET_FEATURE(S390_FEAT_VECTOR_ENH, HWCAP_S390_VXRS_EXT);
1767 GET_FEATURE(S390_FEAT_VECTOR_ENH2, HWCAP_S390_VXRS_EXT2);
1768
1769 return hwcap;
1770 }
1771
1772 const char *elf_hwcap_str(uint32_t bit)
1773 {
1774 static const char *hwcap_str[] = {
1775 [HWCAP_S390_NR_ESAN3] = "esan3",
1776 [HWCAP_S390_NR_ZARCH] = "zarch",
1777 [HWCAP_S390_NR_STFLE] = "stfle",
1778 [HWCAP_S390_NR_MSA] = "msa",
1779 [HWCAP_S390_NR_LDISP] = "ldisp",
1780 [HWCAP_S390_NR_EIMM] = "eimm",
1781 [HWCAP_S390_NR_DFP] = "dfp",
1782 [HWCAP_S390_NR_HPAGE] = "edat",
1783 [HWCAP_S390_NR_ETF3EH] = "etf3eh",
1784 [HWCAP_S390_NR_HIGH_GPRS] = "highgprs",
1785 [HWCAP_S390_NR_TE] = "te",
1786 [HWCAP_S390_NR_VXRS] = "vx",
1787 [HWCAP_S390_NR_VXRS_BCD] = "vxd",
1788 [HWCAP_S390_NR_VXRS_EXT] = "vxe",
1789 [HWCAP_S390_NR_GS] = "gs",
1790 [HWCAP_S390_NR_VXRS_EXT2] = "vxe2",
1791 [HWCAP_S390_NR_VXRS_PDE] = "vxp",
1792 [HWCAP_S390_NR_SORT] = "sort",
1793 [HWCAP_S390_NR_DFLT] = "dflt",
1794 [HWCAP_S390_NR_NNPA] = "nnpa",
1795 [HWCAP_S390_NR_PCI_MIO] = "pcimio",
1796 [HWCAP_S390_NR_SIE] = "sie",
1797 };
1798
1799 return bit < ARRAY_SIZE(hwcap_str) ? hwcap_str[bit] : NULL;
1800 }
1801
1802 static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
1803 {
1804 regs->psw.addr = infop->entry;
1805 regs->psw.mask = PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | \
1806 PSW_MASK_MCHECK | PSW_MASK_PSTATE | PSW_MASK_64 | \
1807 PSW_MASK_32;
1808 regs->gprs[15] = infop->start_stack;
1809 }
1810
1811 /* See linux kernel: arch/s390/include/uapi/asm/ptrace.h (s390_regs). */
1812 #define ELF_NREG 27
1813 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1814
1815 enum {
1816 TARGET_REG_PSWM = 0,
1817 TARGET_REG_PSWA = 1,
1818 TARGET_REG_GPRS = 2,
1819 TARGET_REG_ARS = 18,
1820 TARGET_REG_ORIG_R2 = 26,
1821 };
1822
1823 static void elf_core_copy_regs(target_elf_gregset_t *regs,
1824 const CPUS390XState *env)
1825 {
1826 int i;
1827 uint32_t *aregs;
1828
1829 (*regs)[TARGET_REG_PSWM] = tswapreg(env->psw.mask);
1830 (*regs)[TARGET_REG_PSWA] = tswapreg(env->psw.addr);
1831 for (i = 0; i < 16; i++) {
1832 (*regs)[TARGET_REG_GPRS + i] = tswapreg(env->regs[i]);
1833 }
1834 aregs = (uint32_t *)&((*regs)[TARGET_REG_ARS]);
1835 for (i = 0; i < 16; i++) {
1836 aregs[i] = tswap32(env->aregs[i]);
1837 }
1838 (*regs)[TARGET_REG_ORIG_R2] = 0;
1839 }
1840
1841 #define USE_ELF_CORE_DUMP
1842 #define ELF_EXEC_PAGESIZE 4096
1843
1844 #endif /* TARGET_S390X */
1845
1846 #ifdef TARGET_RISCV
1847
1848 #define ELF_ARCH EM_RISCV
1849
1850 #ifdef TARGET_RISCV32
1851 #define ELF_CLASS ELFCLASS32
1852 #else
1853 #define ELF_CLASS ELFCLASS64
1854 #endif
1855
1856 #define ELF_HWCAP get_elf_hwcap()
1857
1858 static uint32_t get_elf_hwcap(void)
1859 {
1860 #define MISA_BIT(EXT) (1 << (EXT - 'A'))
1861 RISCVCPU *cpu = RISCV_CPU(thread_cpu);
1862 uint32_t mask = MISA_BIT('I') | MISA_BIT('M') | MISA_BIT('A')
1863 | MISA_BIT('F') | MISA_BIT('D') | MISA_BIT('C')
1864 | MISA_BIT('V');
1865
1866 return cpu->env.misa_ext & mask;
1867 #undef MISA_BIT
1868 }
1869
1870 static inline void init_thread(struct target_pt_regs *regs,
1871 struct image_info *infop)
1872 {
1873 regs->sepc = infop->entry;
1874 regs->sp = infop->start_stack;
1875 }
1876
1877 #define ELF_EXEC_PAGESIZE 4096
1878
1879 #endif /* TARGET_RISCV */
1880
1881 #ifdef TARGET_HPPA
1882
1883 #define ELF_CLASS ELFCLASS32
1884 #define ELF_ARCH EM_PARISC
1885 #define ELF_PLATFORM "PARISC"
1886 #define STACK_GROWS_DOWN 0
1887 #define STACK_ALIGNMENT 64
1888
1889 static inline void init_thread(struct target_pt_regs *regs,
1890 struct image_info *infop)
1891 {
1892 regs->iaoq[0] = infop->entry;
1893 regs->iaoq[1] = infop->entry + 4;
1894 regs->gr[23] = 0;
1895 regs->gr[24] = infop->argv;
1896 regs->gr[25] = infop->argc;
1897 /* The top-of-stack contains a linkage buffer. */
1898 regs->gr[30] = infop->start_stack + 64;
1899 regs->gr[31] = infop->entry;
1900 }
1901
1902 #define LO_COMMPAGE 0
1903
1904 static bool init_guest_commpage(void)
1905 {
1906 void *want = g2h_untagged(LO_COMMPAGE);
1907 void *addr = mmap(want, qemu_host_page_size, PROT_NONE,
1908 MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
1909
1910 if (addr == MAP_FAILED) {
1911 perror("Allocating guest commpage");
1912 exit(EXIT_FAILURE);
1913 }
1914 if (addr != want) {
1915 return false;
1916 }
1917
1918 /*
1919 * On Linux, page zero is normally marked execute only + gateway.
1920 * Normal read or write is supposed to fail (thus PROT_NONE above),
1921 * but specific offsets have kernel code mapped to raise permissions
1922 * and implement syscalls. Here, simply mark the page executable.
1923 * Special case the entry points during translation (see do_page_zero).
1924 */
1925 page_set_flags(LO_COMMPAGE, LO_COMMPAGE | ~TARGET_PAGE_MASK,
1926 PAGE_EXEC | PAGE_VALID);
1927 return true;
1928 }
1929
1930 #endif /* TARGET_HPPA */
1931
1932 #ifdef TARGET_XTENSA
1933
1934 #define ELF_CLASS ELFCLASS32
1935 #define ELF_ARCH EM_XTENSA
1936
1937 static inline void init_thread(struct target_pt_regs *regs,
1938 struct image_info *infop)
1939 {
1940 regs->windowbase = 0;
1941 regs->windowstart = 1;
1942 regs->areg[1] = infop->start_stack;
1943 regs->pc = infop->entry;
1944 if (info_is_fdpic(infop)) {
1945 regs->areg[4] = infop->loadmap_addr;
1946 regs->areg[5] = infop->interpreter_loadmap_addr;
1947 if (infop->interpreter_loadmap_addr) {
1948 regs->areg[6] = infop->interpreter_pt_dynamic_addr;
1949 } else {
1950 regs->areg[6] = infop->pt_dynamic_addr;
1951 }
1952 }
1953 }
1954
1955 /* See linux kernel: arch/xtensa/include/asm/elf.h. */
1956 #define ELF_NREG 128
1957 typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
1958
1959 enum {
1960 TARGET_REG_PC,
1961 TARGET_REG_PS,
1962 TARGET_REG_LBEG,
1963 TARGET_REG_LEND,
1964 TARGET_REG_LCOUNT,
1965 TARGET_REG_SAR,
1966 TARGET_REG_WINDOWSTART,
1967 TARGET_REG_WINDOWBASE,
1968 TARGET_REG_THREADPTR,
1969 TARGET_REG_AR0 = 64,
1970 };
1971
1972 static void elf_core_copy_regs(target_elf_gregset_t *regs,
1973 const CPUXtensaState *env)
1974 {
1975 unsigned i;
1976
1977 (*regs)[TARGET_REG_PC] = tswapreg(env->pc);
1978 (*regs)[TARGET_REG_PS] = tswapreg(env->sregs[PS] & ~PS_EXCM);
1979 (*regs)[TARGET_REG_LBEG] = tswapreg(env->sregs[LBEG]);
1980 (*regs)[TARGET_REG_LEND] = tswapreg(env->sregs[LEND]);
1981 (*regs)[TARGET_REG_LCOUNT] = tswapreg(env->sregs[LCOUNT]);
1982 (*regs)[TARGET_REG_SAR] = tswapreg(env->sregs[SAR]);
1983 (*regs)[TARGET_REG_WINDOWSTART] = tswapreg(env->sregs[WINDOW_START]);
1984 (*regs)[TARGET_REG_WINDOWBASE] = tswapreg(env->sregs[WINDOW_BASE]);
1985 (*regs)[TARGET_REG_THREADPTR] = tswapreg(env->uregs[THREADPTR]);
1986 xtensa_sync_phys_from_window((CPUXtensaState *)env);
1987 for (i = 0; i < env->config->nareg; ++i) {
1988 (*regs)[TARGET_REG_AR0 + i] = tswapreg(env->phys_regs[i]);
1989 }
1990 }
1991
1992 #define USE_ELF_CORE_DUMP
1993 #define ELF_EXEC_PAGESIZE 4096
1994
1995 #endif /* TARGET_XTENSA */
1996
1997 #ifdef TARGET_HEXAGON
1998
1999 #define ELF_CLASS ELFCLASS32
2000 #define ELF_ARCH EM_HEXAGON
2001
2002 static inline void init_thread(struct target_pt_regs *regs,
2003 struct image_info *infop)
2004 {
2005 regs->sepc = infop->entry;
2006 regs->sp = infop->start_stack;
2007 }
2008
2009 #endif /* TARGET_HEXAGON */
2010
2011 #ifndef ELF_BASE_PLATFORM
2012 #define ELF_BASE_PLATFORM (NULL)
2013 #endif
2014
2015 #ifndef ELF_PLATFORM
2016 #define ELF_PLATFORM (NULL)
2017 #endif
2018
2019 #ifndef ELF_MACHINE
2020 #define ELF_MACHINE ELF_ARCH
2021 #endif
2022
2023 #ifndef elf_check_arch
2024 #define elf_check_arch(x) ((x) == ELF_ARCH)
2025 #endif
2026
2027 #ifndef elf_check_abi
2028 #define elf_check_abi(x) (1)
2029 #endif
2030
2031 #ifndef ELF_HWCAP
2032 #define ELF_HWCAP 0
2033 #endif
2034
2035 #ifndef STACK_GROWS_DOWN
2036 #define STACK_GROWS_DOWN 1
2037 #endif
2038
2039 #ifndef STACK_ALIGNMENT
2040 #define STACK_ALIGNMENT 16
2041 #endif
2042
2043 #ifdef TARGET_ABI32
2044 #undef ELF_CLASS
2045 #define ELF_CLASS ELFCLASS32
2046 #undef bswaptls
2047 #define bswaptls(ptr) bswap32s(ptr)
2048 #endif
2049
2050 #ifndef EXSTACK_DEFAULT
2051 #define EXSTACK_DEFAULT false
2052 #endif
2053
2054 #include "elf.h"
2055
2056 /* We must delay the following stanzas until after "elf.h". */
2057 #if defined(TARGET_AARCH64)
2058
2059 static bool arch_parse_elf_property(uint32_t pr_type, uint32_t pr_datasz,
2060 const uint32_t *data,
2061 struct image_info *info,
2062 Error **errp)
2063 {
2064 if (pr_type == GNU_PROPERTY_AARCH64_FEATURE_1_AND) {
2065 if (pr_datasz != sizeof(uint32_t)) {
2066 error_setg(errp, "Ill-formed GNU_PROPERTY_AARCH64_FEATURE_1_AND");
2067 return false;
2068 }
2069 /* We will extract GNU_PROPERTY_AARCH64_FEATURE_1_BTI later. */
2070 info->note_flags = *data;
2071 }
2072 return true;
2073 }
2074 #define ARCH_USE_GNU_PROPERTY 1
2075
2076 #else
2077
2078 static bool arch_parse_elf_property(uint32_t pr_type, uint32_t pr_datasz,
2079 const uint32_t *data,
2080 struct image_info *info,
2081 Error **errp)
2082 {
2083 g_assert_not_reached();
2084 }
2085 #define ARCH_USE_GNU_PROPERTY 0
2086
2087 #endif
2088
2089 struct exec
2090 {
2091 unsigned int a_info; /* Use macros N_MAGIC, etc for access */
2092 unsigned int a_text; /* length of text, in bytes */
2093 unsigned int a_data; /* length of data, in bytes */
2094 unsigned int a_bss; /* length of uninitialized data area, in bytes */
2095 unsigned int a_syms; /* length of symbol table data in file, in bytes */
2096 unsigned int a_entry; /* start address */
2097 unsigned int a_trsize; /* length of relocation info for text, in bytes */
2098 unsigned int a_drsize; /* length of relocation info for data, in bytes */
2099 };
2100
2101
2102 #define N_MAGIC(exec) ((exec).a_info & 0xffff)
2103 #define OMAGIC 0407
2104 #define NMAGIC 0410
2105 #define ZMAGIC 0413
2106 #define QMAGIC 0314
2107
2108 #define DLINFO_ITEMS 16
2109
2110 static inline void memcpy_fromfs(void * to, const void * from, unsigned long n)
2111 {
2112 memcpy(to, from, n);
2113 }
2114
2115 #ifdef BSWAP_NEEDED
2116 static void bswap_ehdr(struct elfhdr *ehdr)
2117 {
2118 bswap16s(&ehdr->e_type); /* Object file type */
2119 bswap16s(&ehdr->e_machine); /* Architecture */
2120 bswap32s(&ehdr->e_version); /* Object file version */
2121 bswaptls(&ehdr->e_entry); /* Entry point virtual address */
2122 bswaptls(&ehdr->e_phoff); /* Program header table file offset */
2123 bswaptls(&ehdr->e_shoff); /* Section header table file offset */
2124 bswap32s(&ehdr->e_flags); /* Processor-specific flags */
2125 bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */
2126 bswap16s(&ehdr->e_phentsize); /* Program header table entry size */
2127 bswap16s(&ehdr->e_phnum); /* Program header table entry count */
2128 bswap16s(&ehdr->e_shentsize); /* Section header table entry size */
2129 bswap16s(&ehdr->e_shnum); /* Section header table entry count */
2130 bswap16s(&ehdr->e_shstrndx); /* Section header string table index */
2131 }
2132
2133 static void bswap_phdr(struct elf_phdr *phdr, int phnum)
2134 {
2135 int i;
2136 for (i = 0; i < phnum; ++i, ++phdr) {
2137 bswap32s(&phdr->p_type); /* Segment type */
2138 bswap32s(&phdr->p_flags); /* Segment flags */
2139 bswaptls(&phdr->p_offset); /* Segment file offset */
2140 bswaptls(&phdr->p_vaddr); /* Segment virtual address */
2141 bswaptls(&phdr->p_paddr); /* Segment physical address */
2142 bswaptls(&phdr->p_filesz); /* Segment size in file */
2143 bswaptls(&phdr->p_memsz); /* Segment size in memory */
2144 bswaptls(&phdr->p_align); /* Segment alignment */
2145 }
2146 }
2147
2148 static void bswap_shdr(struct elf_shdr *shdr, int shnum)
2149 {
2150 int i;
2151 for (i = 0; i < shnum; ++i, ++shdr) {
2152 bswap32s(&shdr->sh_name);
2153 bswap32s(&shdr->sh_type);
2154 bswaptls(&shdr->sh_flags);
2155 bswaptls(&shdr->sh_addr);
2156 bswaptls(&shdr->sh_offset);
2157 bswaptls(&shdr->sh_size);
2158 bswap32s(&shdr->sh_link);
2159 bswap32s(&shdr->sh_info);
2160 bswaptls(&shdr->sh_addralign);
2161 bswaptls(&shdr->sh_entsize);
2162 }
2163 }
2164
2165 static void bswap_sym(struct elf_sym *sym)
2166 {
2167 bswap32s(&sym->st_name);
2168 bswaptls(&sym->st_value);
2169 bswaptls(&sym->st_size);
2170 bswap16s(&sym->st_shndx);
2171 }
2172
2173 #ifdef TARGET_MIPS
2174 static void bswap_mips_abiflags(Mips_elf_abiflags_v0 *abiflags)
2175 {
2176 bswap16s(&abiflags->version);
2177 bswap32s(&abiflags->ases);
2178 bswap32s(&abiflags->isa_ext);
2179 bswap32s(&abiflags->flags1);
2180 bswap32s(&abiflags->flags2);
2181 }
2182 #endif
2183 #else
2184 static inline void bswap_ehdr(struct elfhdr *ehdr) { }
2185 static inline void bswap_phdr(struct elf_phdr *phdr, int phnum) { }
2186 static inline void bswap_shdr(struct elf_shdr *shdr, int shnum) { }
2187 static inline void bswap_sym(struct elf_sym *sym) { }
2188 #ifdef TARGET_MIPS
2189 static inline void bswap_mips_abiflags(Mips_elf_abiflags_v0 *abiflags) { }
2190 #endif
2191 #endif
2192
2193 #ifdef USE_ELF_CORE_DUMP
2194 static int elf_core_dump(int, const CPUArchState *);
2195 #endif /* USE_ELF_CORE_DUMP */
2196 static void load_symbols(struct elfhdr *hdr, int fd, abi_ulong load_bias);
2197
2198 /* Verify the portions of EHDR within E_IDENT for the target.
2199 This can be performed before bswapping the entire header. */
2200 static bool elf_check_ident(struct elfhdr *ehdr)
2201 {
2202 return (ehdr->e_ident[EI_MAG0] == ELFMAG0
2203 && ehdr->e_ident[EI_MAG1] == ELFMAG1
2204 && ehdr->e_ident[EI_MAG2] == ELFMAG2
2205 && ehdr->e_ident[EI_MAG3] == ELFMAG3
2206 && ehdr->e_ident[EI_CLASS] == ELF_CLASS
2207 && ehdr->e_ident[EI_DATA] == ELF_DATA
2208 && ehdr->e_ident[EI_VERSION] == EV_CURRENT);
2209 }
2210
2211 /* Verify the portions of EHDR outside of E_IDENT for the target.
2212 This has to wait until after bswapping the header. */
2213 static bool elf_check_ehdr(struct elfhdr *ehdr)
2214 {
2215 return (elf_check_arch(ehdr->e_machine)
2216 && elf_check_abi(ehdr->e_flags)
2217 && ehdr->e_ehsize == sizeof(struct elfhdr)
2218 && ehdr->e_phentsize == sizeof(struct elf_phdr)
2219 && (ehdr->e_type == ET_EXEC || ehdr->e_type == ET_DYN));
2220 }
2221
2222 /*
2223 * 'copy_elf_strings()' copies argument/envelope strings from user
2224 * memory to free pages in kernel mem. These are in a format ready
2225 * to be put directly into the top of new user memory.
2226 *
2227 */
2228 static abi_ulong copy_elf_strings(int argc, char **argv, char *scratch,
2229 abi_ulong p, abi_ulong stack_limit)
2230 {
2231 char *tmp;
2232 int len, i;
2233 abi_ulong top = p;
2234
2235 if (!p) {
2236 return 0; /* bullet-proofing */
2237 }
2238
2239 if (STACK_GROWS_DOWN) {
2240 int offset = ((p - 1) % TARGET_PAGE_SIZE) + 1;
2241 for (i = argc - 1; i >= 0; --i) {
2242 tmp = argv[i];
2243 if (!tmp) {
2244 fprintf(stderr, "VFS: argc is wrong");
2245 exit(-1);
2246 }
2247 len = strlen(tmp) + 1;
2248 tmp += len;
2249
2250 if (len > (p - stack_limit)) {
2251 return 0;
2252 }
2253 while (len) {
2254 int bytes_to_copy = (len > offset) ? offset : len;
2255 tmp -= bytes_to_copy;
2256 p -= bytes_to_copy;
2257 offset -= bytes_to_copy;
2258 len -= bytes_to_copy;
2259
2260 memcpy_fromfs(scratch + offset, tmp, bytes_to_copy);
2261
2262 if (offset == 0) {
2263 memcpy_to_target(p, scratch, top - p);
2264 top = p;
2265 offset = TARGET_PAGE_SIZE;
2266 }
2267 }
2268 }
2269 if (p != top) {
2270 memcpy_to_target(p, scratch + offset, top - p);
2271 }
2272 } else {
2273 int remaining = TARGET_PAGE_SIZE - (p % TARGET_PAGE_SIZE);
2274 for (i = 0; i < argc; ++i) {
2275 tmp = argv[i];
2276 if (!tmp) {
2277 fprintf(stderr, "VFS: argc is wrong");
2278 exit(-1);
2279 }
2280 len = strlen(tmp) + 1;
2281 if (len > (stack_limit - p)) {
2282 return 0;
2283 }
2284 while (len) {
2285 int bytes_to_copy = (len > remaining) ? remaining : len;
2286
2287 memcpy_fromfs(scratch + (p - top), tmp, bytes_to_copy);
2288
2289 tmp += bytes_to_copy;
2290 remaining -= bytes_to_copy;
2291 p += bytes_to_copy;
2292 len -= bytes_to_copy;
2293
2294 if (remaining == 0) {
2295 memcpy_to_target(top, scratch, p - top);
2296 top = p;
2297 remaining = TARGET_PAGE_SIZE;
2298 }
2299 }
2300 }
2301 if (p != top) {
2302 memcpy_to_target(top, scratch, p - top);
2303 }
2304 }
2305
2306 return p;
2307 }
2308
2309 /* Older linux kernels provide up to MAX_ARG_PAGES (default: 32) of
2310 * argument/environment space. Newer kernels (>2.6.33) allow more,
2311 * dependent on stack size, but guarantee at least 32 pages for
2312 * backwards compatibility.
2313 */
2314 #define STACK_LOWER_LIMIT (32 * TARGET_PAGE_SIZE)
2315
2316 static abi_ulong setup_arg_pages(struct linux_binprm *bprm,
2317 struct image_info *info)
2318 {
2319 abi_ulong size, error, guard;
2320 int prot;
2321
2322 size = guest_stack_size;
2323 if (size < STACK_LOWER_LIMIT) {
2324 size = STACK_LOWER_LIMIT;
2325 }
2326
2327 if (STACK_GROWS_DOWN) {
2328 guard = TARGET_PAGE_SIZE;
2329 if (guard < qemu_real_host_page_size()) {
2330 guard = qemu_real_host_page_size();
2331 }
2332 } else {
2333 /* no guard page for hppa target where stack grows upwards. */
2334 guard = 0;
2335 }
2336
2337 prot = PROT_READ | PROT_WRITE;
2338 if (info->exec_stack) {
2339 prot |= PROT_EXEC;
2340 }
2341 error = target_mmap(0, size + guard, prot,
2342 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
2343 if (error == -1) {
2344 perror("mmap stack");
2345 exit(-1);
2346 }
2347
2348 /* We reserve one extra page at the top of the stack as guard. */
2349 if (STACK_GROWS_DOWN) {
2350 target_mprotect(error, guard, PROT_NONE);
2351 info->stack_limit = error + guard;
2352 return info->stack_limit + size - sizeof(void *);
2353 } else {
2354 info->stack_limit = error + size;
2355 return error;
2356 }
2357 }
2358
2359 /**
2360 * zero_bss:
2361 *
2362 * Map and zero the bss. We need to explicitly zero any fractional pages
2363 * after the data section (i.e. bss). Return false on mapping failure.
2364 */
2365 static bool zero_bss(abi_ulong start_bss, abi_ulong end_bss,
2366 int prot, Error **errp)
2367 {
2368 abi_ulong align_bss;
2369
2370 /* We only expect writable bss; the code segment shouldn't need this. */
2371 if (!(prot & PROT_WRITE)) {
2372 error_setg(errp, "PT_LOAD with non-writable bss");
2373 return false;
2374 }
2375
2376 align_bss = TARGET_PAGE_ALIGN(start_bss);
2377 end_bss = TARGET_PAGE_ALIGN(end_bss);
2378
2379 if (start_bss < align_bss) {
2380 int flags = page_get_flags(start_bss);
2381
2382 if (!(flags & PAGE_BITS)) {
2383 /*
2384 * The whole address space of the executable was reserved
2385 * at the start, therefore all pages will be VALID.
2386 * But assuming there are no PROT_NONE PT_LOAD segments,
2387 * a PROT_NONE page means no data all bss, and we can
2388 * simply extend the new anon mapping back to the start
2389 * of the page of bss.
2390 */
2391 align_bss -= TARGET_PAGE_SIZE;
2392 } else {
2393 /*
2394 * The start of the bss shares a page with something.
2395 * The only thing that we expect is the data section,
2396 * which would already be marked writable.
2397 * Overlapping the RX code segment seems malformed.
2398 */
2399 if (!(flags & PAGE_WRITE)) {
2400 error_setg(errp, "PT_LOAD with bss overlapping "
2401 "non-writable page");
2402 return false;
2403 }
2404
2405 /* The page is already mapped and writable. */
2406 memset(g2h_untagged(start_bss), 0, align_bss - start_bss);
2407 }
2408 }
2409
2410 if (align_bss < end_bss &&
2411 target_mmap(align_bss, end_bss - align_bss, prot,
2412 MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0) == -1) {
2413 error_setg_errno(errp, errno, "Error mapping bss");
2414 return false;
2415 }
2416 return true;
2417 }
2418
2419 #if defined(TARGET_ARM)
2420 static int elf_is_fdpic(struct elfhdr *exec)
2421 {
2422 return exec->e_ident[EI_OSABI] == ELFOSABI_ARM_FDPIC;
2423 }
2424 #elif defined(TARGET_XTENSA)
2425 static int elf_is_fdpic(struct elfhdr *exec)
2426 {
2427 return exec->e_ident[EI_OSABI] == ELFOSABI_XTENSA_FDPIC;
2428 }
2429 #else
2430 /* Default implementation, always false. */
2431 static int elf_is_fdpic(struct elfhdr *exec)
2432 {
2433 return 0;
2434 }
2435 #endif
2436
2437 static abi_ulong loader_build_fdpic_loadmap(struct image_info *info, abi_ulong sp)
2438 {
2439 uint16_t n;
2440 struct elf32_fdpic_loadseg *loadsegs = info->loadsegs;
2441
2442 /* elf32_fdpic_loadseg */
2443 n = info->nsegs;
2444 while (n--) {
2445 sp -= 12;
2446 put_user_u32(loadsegs[n].addr, sp+0);
2447 put_user_u32(loadsegs[n].p_vaddr, sp+4);
2448 put_user_u32(loadsegs[n].p_memsz, sp+8);
2449 }
2450
2451 /* elf32_fdpic_loadmap */
2452 sp -= 4;
2453 put_user_u16(0, sp+0); /* version */
2454 put_user_u16(info->nsegs, sp+2); /* nsegs */
2455
2456 info->personality = PER_LINUX_FDPIC;
2457 info->loadmap_addr = sp;
2458
2459 return sp;
2460 }
2461
2462 static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
2463 struct elfhdr *exec,
2464 struct image_info *info,
2465 struct image_info *interp_info)
2466 {
2467 abi_ulong sp;
2468 abi_ulong u_argc, u_argv, u_envp, u_auxv;
2469 int size;
2470 int i;
2471 abi_ulong u_rand_bytes;
2472 uint8_t k_rand_bytes[16];
2473 abi_ulong u_platform, u_base_platform;
2474 const char *k_platform, *k_base_platform;
2475 const int n = sizeof(elf_addr_t);
2476
2477 sp = p;
2478
2479 /* Needs to be before we load the env/argc/... */
2480 if (elf_is_fdpic(exec)) {
2481 /* Need 4 byte alignment for these structs */
2482 sp &= ~3;
2483 sp = loader_build_fdpic_loadmap(info, sp);
2484 info->other_info = interp_info;
2485 if (interp_info) {
2486 interp_info->other_info = info;
2487 sp = loader_build_fdpic_loadmap(interp_info, sp);
2488 info->interpreter_loadmap_addr = interp_info->loadmap_addr;
2489 info->interpreter_pt_dynamic_addr = interp_info->pt_dynamic_addr;
2490 } else {
2491 info->interpreter_loadmap_addr = 0;
2492 info->interpreter_pt_dynamic_addr = 0;
2493 }
2494 }
2495
2496 u_base_platform = 0;
2497 k_base_platform = ELF_BASE_PLATFORM;
2498 if (k_base_platform) {
2499 size_t len = strlen(k_base_platform) + 1;
2500 if (STACK_GROWS_DOWN) {
2501 sp -= (len + n - 1) & ~(n - 1);
2502 u_base_platform = sp;
2503 /* FIXME - check return value of memcpy_to_target() for failure */
2504 memcpy_to_target(sp, k_base_platform, len);
2505 } else {
2506 memcpy_to_target(sp, k_base_platform, len);
2507 u_base_platform = sp;
2508 sp += len + 1;
2509 }
2510 }
2511
2512 u_platform = 0;
2513 k_platform = ELF_PLATFORM;
2514 if (k_platform) {
2515 size_t len = strlen(k_platform) + 1;
2516 if (STACK_GROWS_DOWN) {
2517 sp -= (len + n - 1) & ~(n - 1);
2518 u_platform = sp;
2519 /* FIXME - check return value of memcpy_to_target() for failure */
2520 memcpy_to_target(sp, k_platform, len);
2521 } else {
2522 memcpy_to_target(sp, k_platform, len);
2523 u_platform = sp;
2524 sp += len + 1;
2525 }
2526 }
2527
2528 /* Provide 16 byte alignment for the PRNG, and basic alignment for
2529 * the argv and envp pointers.
2530 */
2531 if (STACK_GROWS_DOWN) {
2532 sp = QEMU_ALIGN_DOWN(sp, 16);
2533 } else {
2534 sp = QEMU_ALIGN_UP(sp, 16);
2535 }
2536
2537 /*
2538 * Generate 16 random bytes for userspace PRNG seeding.
2539 */
2540 qemu_guest_getrandom_nofail(k_rand_bytes, sizeof(k_rand_bytes));
2541 if (STACK_GROWS_DOWN) {
2542 sp -= 16;
2543 u_rand_bytes = sp;
2544 /* FIXME - check return value of memcpy_to_target() for failure */
2545 memcpy_to_target(sp, k_rand_bytes, 16);
2546 } else {
2547 memcpy_to_target(sp, k_rand_bytes, 16);
2548 u_rand_bytes = sp;
2549 sp += 16;
2550 }
2551
2552 size = (DLINFO_ITEMS + 1) * 2;
2553 if (k_base_platform)
2554 size += 2;
2555 if (k_platform)
2556 size += 2;
2557 #ifdef DLINFO_ARCH_ITEMS
2558 size += DLINFO_ARCH_ITEMS * 2;
2559 #endif
2560 #ifdef ELF_HWCAP2
2561 size += 2;
2562 #endif
2563 info->auxv_len = size * n;
2564
2565 size += envc + argc + 2;
2566 size += 1; /* argc itself */
2567 size *= n;
2568
2569 /* Allocate space and finalize stack alignment for entry now. */
2570 if (STACK_GROWS_DOWN) {
2571 u_argc = QEMU_ALIGN_DOWN(sp - size, STACK_ALIGNMENT);
2572 sp = u_argc;
2573 } else {
2574 u_argc = sp;
2575 sp = QEMU_ALIGN_UP(sp + size, STACK_ALIGNMENT);
2576 }
2577
2578 u_argv = u_argc + n;
2579 u_envp = u_argv + (argc + 1) * n;
2580 u_auxv = u_envp + (envc + 1) * n;
2581 info->saved_auxv = u_auxv;
2582 info->argc = argc;
2583 info->envc = envc;
2584 info->argv = u_argv;
2585 info->envp = u_envp;
2586
2587 /* This is correct because Linux defines
2588 * elf_addr_t as Elf32_Off / Elf64_Off
2589 */
2590 #define NEW_AUX_ENT(id, val) do { \
2591 put_user_ual(id, u_auxv); u_auxv += n; \
2592 put_user_ual(val, u_auxv); u_auxv += n; \
2593 } while(0)
2594
2595 #ifdef ARCH_DLINFO
2596 /*
2597 * ARCH_DLINFO must come first so platform specific code can enforce
2598 * special alignment requirements on the AUXV if necessary (eg. PPC).
2599 */
2600 ARCH_DLINFO;
2601 #endif
2602 /* There must be exactly DLINFO_ITEMS entries here, or the assert
2603 * on info->auxv_len will trigger.
2604 */
2605 NEW_AUX_ENT(AT_PHDR, (abi_ulong)(info->load_addr + exec->e_phoff));
2606 NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof (struct elf_phdr)));
2607 NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum));
2608 if ((info->alignment & ~qemu_host_page_mask) != 0) {
2609 /* Target doesn't support host page size alignment */
2610 NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE));
2611 } else {
2612 NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(MAX(TARGET_PAGE_SIZE,
2613 qemu_host_page_size)));
2614 }
2615 NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_info ? interp_info->load_addr : 0));
2616 NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0);
2617 NEW_AUX_ENT(AT_ENTRY, info->entry);
2618 NEW_AUX_ENT(AT_UID, (abi_ulong) getuid());
2619 NEW_AUX_ENT(AT_EUID, (abi_ulong) geteuid());
2620 NEW_AUX_ENT(AT_GID, (abi_ulong) getgid());
2621 NEW_AUX_ENT(AT_EGID, (abi_ulong) getegid());
2622 NEW_AUX_ENT(AT_HWCAP, (abi_ulong) ELF_HWCAP);
2623 NEW_AUX_ENT(AT_CLKTCK, (abi_ulong) sysconf(_SC_CLK_TCK));
2624 NEW_AUX_ENT(AT_RANDOM, (abi_ulong) u_rand_bytes);
2625 NEW_AUX_ENT(AT_SECURE, (abi_ulong) qemu_getauxval(AT_SECURE));
2626 NEW_AUX_ENT(AT_EXECFN, info->file_string);
2627
2628 #ifdef ELF_HWCAP2
2629 NEW_AUX_ENT(AT_HWCAP2, (abi_ulong) ELF_HWCAP2);
2630 #endif
2631
2632 if (u_base_platform) {
2633 NEW_AUX_ENT(AT_BASE_PLATFORM, u_base_platform);
2634 }
2635 if (u_platform) {
2636 NEW_AUX_ENT(AT_PLATFORM, u_platform);
2637 }
2638 NEW_AUX_ENT (AT_NULL, 0);
2639 #undef NEW_AUX_ENT
2640
2641 /* Check that our initial calculation of the auxv length matches how much
2642 * we actually put into it.
2643 */
2644 assert(info->auxv_len == u_auxv - info->saved_auxv);
2645
2646 put_user_ual(argc, u_argc);
2647
2648 p = info->arg_strings;
2649 for (i = 0; i < argc; ++i) {
2650 put_user_ual(p, u_argv);
2651 u_argv += n;
2652 p += target_strlen(p) + 1;
2653 }
2654 put_user_ual(0, u_argv);
2655
2656 p = info->env_strings;
2657 for (i = 0; i < envc; ++i) {
2658 put_user_ual(p, u_envp);
2659 u_envp += n;
2660 p += target_strlen(p) + 1;
2661 }
2662 put_user_ual(0, u_envp);
2663
2664 return sp;
2665 }
2666
2667 #if defined(HI_COMMPAGE)
2668 #define LO_COMMPAGE -1
2669 #elif defined(LO_COMMPAGE)
2670 #define HI_COMMPAGE 0
2671 #else
2672 #define HI_COMMPAGE 0
2673 #define LO_COMMPAGE -1
2674 #ifndef INIT_GUEST_COMMPAGE
2675 #define init_guest_commpage() true
2676 #endif
2677 #endif
2678
2679 /**
2680 * pgb_try_mmap:
2681 * @addr: host start address
2682 * @addr_last: host last address
2683 * @keep: do not unmap the probe region
2684 *
2685 * Return 1 if [@addr, @addr_last] is not mapped in the host,
2686 * return 0 if it is not available to map, and -1 on mmap error.
2687 * If @keep, the region is left mapped on success, otherwise unmapped.
2688 */
2689 static int pgb_try_mmap(uintptr_t addr, uintptr_t addr_last, bool keep)
2690 {
2691 size_t size = addr_last - addr + 1;
2692 void *p = mmap((void *)addr, size, PROT_NONE,
2693 MAP_ANONYMOUS | MAP_PRIVATE |
2694 MAP_NORESERVE | MAP_FIXED_NOREPLACE, -1, 0);
2695 int ret;
2696
2697 if (p == MAP_FAILED) {
2698 return errno == EEXIST ? 0 : -1;
2699 }
2700 ret = p == (void *)addr;
2701 if (!keep || !ret) {
2702 munmap(p, size);
2703 }
2704 return ret;
2705 }
2706
2707 /**
2708 * pgb_try_mmap_skip_brk(uintptr_t addr, uintptr_t size, uintptr_t brk)
2709 * @addr: host address
2710 * @addr_last: host last address
2711 * @brk: host brk
2712 *
2713 * Like pgb_try_mmap, but additionally reserve some memory following brk.
2714 */
2715 static int pgb_try_mmap_skip_brk(uintptr_t addr, uintptr_t addr_last,
2716 uintptr_t brk, bool keep)
2717 {
2718 uintptr_t brk_last = brk + 16 * MiB - 1;
2719
2720 /* Do not map anything close to the host brk. */
2721 if (addr <= brk_last && brk <= addr_last) {
2722 return 0;
2723 }
2724 return pgb_try_mmap(addr, addr_last, keep);
2725 }
2726
2727 /**
2728 * pgb_try_mmap_set:
2729 * @ga: set of guest addrs
2730 * @base: guest_base
2731 * @brk: host brk
2732 *
2733 * Return true if all @ga can be mapped by the host at @base.
2734 * On success, retain the mapping at index 0 for reserved_va.
2735 */
2736
2737 typedef struct PGBAddrs {
2738 uintptr_t bounds[3][2]; /* start/last pairs */
2739 int nbounds;
2740 } PGBAddrs;
2741
2742 static bool pgb_try_mmap_set(const PGBAddrs *ga, uintptr_t base, uintptr_t brk)
2743 {
2744 for (int i = ga->nbounds - 1; i >= 0; --i) {
2745 if (pgb_try_mmap_skip_brk(ga->bounds[i][0] + base,
2746 ga->bounds[i][1] + base,
2747 brk, i == 0 && reserved_va) <= 0) {
2748 return false;
2749 }
2750 }
2751 return true;
2752 }
2753
2754 /**
2755 * pgb_addr_set:
2756 * @ga: output set of guest addrs
2757 * @guest_loaddr: guest image low address
2758 * @guest_loaddr: guest image high address
2759 * @identity: create for identity mapping
2760 *
2761 * Fill in @ga with the image, COMMPAGE and NULL page.
2762 */
2763 static bool pgb_addr_set(PGBAddrs *ga, abi_ulong guest_loaddr,
2764 abi_ulong guest_hiaddr, bool try_identity)
2765 {
2766 int n;
2767
2768 /*
2769 * With a low commpage, or a guest mapped very low,
2770 * we may not be able to use the identity map.
2771 */
2772 if (try_identity) {
2773 if (LO_COMMPAGE != -1 && LO_COMMPAGE < mmap_min_addr) {
2774 return false;
2775 }
2776 if (guest_loaddr != 0 && guest_loaddr < mmap_min_addr) {
2777 return false;
2778 }
2779 }
2780
2781 memset(ga, 0, sizeof(*ga));
2782 n = 0;
2783
2784 if (reserved_va) {
2785 ga->bounds[n][0] = try_identity ? mmap_min_addr : 0;
2786 ga->bounds[n][1] = reserved_va;
2787 n++;
2788 /* LO_COMMPAGE and NULL handled by reserving from 0. */
2789 } else {
2790 /* Add any LO_COMMPAGE or NULL page. */
2791 if (LO_COMMPAGE != -1) {
2792 ga->bounds[n][0] = 0;
2793 ga->bounds[n][1] = LO_COMMPAGE + TARGET_PAGE_SIZE - 1;
2794 n++;
2795 } else if (!try_identity) {
2796 ga->bounds[n][0] = 0;
2797 ga->bounds[n][1] = TARGET_PAGE_SIZE - 1;
2798 n++;
2799 }
2800
2801 /* Add the guest image for ET_EXEC. */
2802 if (guest_loaddr) {
2803 ga->bounds[n][0] = guest_loaddr;
2804 ga->bounds[n][1] = guest_hiaddr;
2805 n++;
2806 }
2807 }
2808
2809 /*
2810 * Temporarily disable
2811 * "comparison is always false due to limited range of data type"
2812 * due to comparison between unsigned and (possible) 0.
2813 */
2814 #pragma GCC diagnostic push
2815 #pragma GCC diagnostic ignored "-Wtype-limits"
2816
2817 /* Add any HI_COMMPAGE not covered by reserved_va. */
2818 if (reserved_va < HI_COMMPAGE) {
2819 ga->bounds[n][0] = HI_COMMPAGE & qemu_host_page_mask;
2820 ga->bounds[n][1] = HI_COMMPAGE + TARGET_PAGE_SIZE - 1;
2821 n++;
2822 }
2823
2824 #pragma GCC diagnostic pop
2825
2826 ga->nbounds = n;
2827 return true;
2828 }
2829
2830 static void pgb_fail_in_use(const char *image_name)
2831 {
2832 error_report("%s: requires virtual address space that is in use "
2833 "(omit the -B option or choose a different value)",
2834 image_name);
2835 exit(EXIT_FAILURE);
2836 }
2837
2838 static void pgb_fixed(const char *image_name, uintptr_t guest_loaddr,
2839 uintptr_t guest_hiaddr, uintptr_t align)
2840 {
2841 PGBAddrs ga;
2842 uintptr_t brk = (uintptr_t)sbrk(0);
2843
2844 if (!QEMU_IS_ALIGNED(guest_base, align)) {
2845 fprintf(stderr, "Requested guest base %p does not satisfy "
2846 "host minimum alignment (0x%" PRIxPTR ")\n",
2847 (void *)guest_base, align);
2848 exit(EXIT_FAILURE);
2849 }
2850
2851 if (!pgb_addr_set(&ga, guest_loaddr, guest_hiaddr, !guest_base)
2852 || !pgb_try_mmap_set(&ga, guest_base, brk)) {
2853 pgb_fail_in_use(image_name);
2854 }
2855 }
2856
2857 /**
2858 * pgb_find_fallback:
2859 *
2860 * This is a fallback method for finding holes in the host address space
2861 * if we don't have the benefit of being able to access /proc/self/map.
2862 * It can potentially take a very long time as we can only dumbly iterate
2863 * up the host address space seeing if the allocation would work.
2864 */
2865 static uintptr_t pgb_find_fallback(const PGBAddrs *ga, uintptr_t align,
2866 uintptr_t brk)
2867 {
2868 /* TODO: come up with a better estimate of how much to skip. */
2869 uintptr_t skip = sizeof(uintptr_t) == 4 ? MiB : GiB;
2870
2871 for (uintptr_t base = skip; ; base += skip) {
2872 base = ROUND_UP(base, align);
2873 if (pgb_try_mmap_set(ga, base, brk)) {
2874 return base;
2875 }
2876 if (base >= -skip) {
2877 return -1;
2878 }
2879 }
2880 }
2881
2882 static uintptr_t pgb_try_itree(const PGBAddrs *ga, uintptr_t base,
2883 IntervalTreeRoot *root)
2884 {
2885 for (int i = ga->nbounds - 1; i >= 0; --i) {
2886 uintptr_t s = base + ga->bounds[i][0];
2887 uintptr_t l = base + ga->bounds[i][1];
2888 IntervalTreeNode *n;
2889
2890 if (l < s) {
2891 /* Wraparound. Skip to advance S to mmap_min_addr. */
2892 return mmap_min_addr - s;
2893 }
2894
2895 n = interval_tree_iter_first(root, s, l);
2896 if (n != NULL) {
2897 /* Conflict. Skip to advance S to LAST + 1. */
2898 return n->last - s + 1;
2899 }
2900 }
2901 return 0; /* success */
2902 }
2903
2904 static uintptr_t pgb_find_itree(const PGBAddrs *ga, IntervalTreeRoot *root,
2905 uintptr_t align, uintptr_t brk)
2906 {
2907 uintptr_t last = mmap_min_addr;
2908 uintptr_t base, skip;
2909
2910 while (true) {
2911 base = ROUND_UP(last, align);
2912 if (base < last) {
2913 return -1;
2914 }
2915
2916 skip = pgb_try_itree(ga, base, root);
2917 if (skip == 0) {
2918 break;
2919 }
2920
2921 last = base + skip;
2922 if (last < base) {
2923 return -1;
2924 }
2925 }
2926
2927 /*
2928 * We've chosen 'base' based on holes in the interval tree,
2929 * but we don't yet know if it is a valid host address.
2930 * Because it is the first matching hole, if the host addresses
2931 * are invalid we know there are no further matches.
2932 */
2933 return pgb_try_mmap_set(ga, base, brk) ? base : -1;
2934 }
2935
2936 static void pgb_dynamic(const char *image_name, uintptr_t guest_loaddr,
2937 uintptr_t guest_hiaddr, uintptr_t align)
2938 {
2939 IntervalTreeRoot *root;
2940 uintptr_t brk, ret;
2941 PGBAddrs ga;
2942
2943 assert(QEMU_IS_ALIGNED(guest_loaddr, align));
2944
2945 /* Try the identity map first. */
2946 if (pgb_addr_set(&ga, guest_loaddr, guest_hiaddr, true)) {
2947 brk = (uintptr_t)sbrk(0);
2948 if (pgb_try_mmap_set(&ga, 0, brk)) {
2949 guest_base = 0;
2950 return;
2951 }
2952 }
2953
2954 /*
2955 * Rebuild the address set for non-identity map.
2956 * This differs in the mapping of the guest NULL page.
2957 */
2958 pgb_addr_set(&ga, guest_loaddr, guest_hiaddr, false);
2959
2960 root = read_self_maps();
2961
2962 /* Read brk after we've read the maps, which will malloc. */
2963 brk = (uintptr_t)sbrk(0);
2964
2965 if (!root) {
2966 ret = pgb_find_fallback(&ga, align, brk);
2967 } else {
2968 /*
2969 * Reserve the area close to the host brk.
2970 * This will be freed with the rest of the tree.
2971 */
2972 IntervalTreeNode *b = g_new0(IntervalTreeNode, 1);
2973 b->start = brk;
2974 b->last = brk + 16 * MiB - 1;
2975 interval_tree_insert(b, root);
2976
2977 ret = pgb_find_itree(&ga, root, align, brk);
2978 free_self_maps(root);
2979 }
2980
2981 if (ret == -1) {
2982 int w = TARGET_LONG_BITS / 4;
2983
2984 error_report("%s: Unable to find a guest_base to satisfy all "
2985 "guest address mapping requirements", image_name);
2986
2987 for (int i = 0; i < ga.nbounds; ++i) {
2988 error_printf(" %0*" PRIx64 "-%0*" PRIx64 "\n",
2989 w, (uint64_t)ga.bounds[i][0],
2990 w, (uint64_t)ga.bounds[i][1]);
2991 }
2992 exit(EXIT_FAILURE);
2993 }
2994 guest_base = ret;
2995 }
2996
2997 void probe_guest_base(const char *image_name, abi_ulong guest_loaddr,
2998 abi_ulong guest_hiaddr)
2999 {
3000 /* In order to use host shmat, we must be able to honor SHMLBA. */
3001 uintptr_t align = MAX(SHMLBA, qemu_host_page_size);
3002
3003 /* Sanity check the guest binary. */
3004 if (reserved_va) {
3005 if (guest_hiaddr > reserved_va) {
3006 error_report("%s: requires more than reserved virtual "
3007 "address space (0x%" PRIx64 " > 0x%lx)",
3008 image_name, (uint64_t)guest_hiaddr, reserved_va);
3009 exit(EXIT_FAILURE);
3010 }
3011 } else {
3012 if (guest_hiaddr != (uintptr_t)guest_hiaddr) {
3013 error_report("%s: requires more virtual address space "
3014 "than the host can provide (0x%" PRIx64 ")",
3015 image_name, (uint64_t)guest_hiaddr + 1);
3016 exit(EXIT_FAILURE);
3017 }
3018 }
3019
3020 if (have_guest_base) {
3021 pgb_fixed(image_name, guest_loaddr, guest_hiaddr, align);
3022 } else {
3023 pgb_dynamic(image_name, guest_loaddr, guest_hiaddr, align);
3024 }
3025
3026 /* Reserve and initialize the commpage. */
3027 if (!init_guest_commpage()) {
3028 /* We have already probed for the commpage being free. */
3029 g_assert_not_reached();
3030 }
3031
3032 assert(QEMU_IS_ALIGNED(guest_base, align));
3033 qemu_log_mask(CPU_LOG_PAGE, "Locating guest address space "
3034 "@ 0x%" PRIx64 "\n", (uint64_t)guest_base);
3035 }
3036
3037 enum {
3038 /* The string "GNU\0" as a magic number. */
3039 GNU0_MAGIC = const_le32('G' | 'N' << 8 | 'U' << 16),
3040 NOTE_DATA_SZ = 1 * KiB,
3041 NOTE_NAME_SZ = 4,
3042 ELF_GNU_PROPERTY_ALIGN = ELF_CLASS == ELFCLASS32 ? 4 : 8,
3043 };
3044
3045 /*
3046 * Process a single gnu_property entry.
3047 * Return false for error.
3048 */
3049 static bool parse_elf_property(const uint32_t *data, int *off, int datasz,
3050 struct image_info *info, bool have_prev_type,
3051 uint32_t *prev_type, Error **errp)
3052 {
3053 uint32_t pr_type, pr_datasz, step;
3054
3055 if (*off > datasz || !QEMU_IS_ALIGNED(*off, ELF_GNU_PROPERTY_ALIGN)) {
3056 goto error_data;
3057 }
3058 datasz -= *off;
3059 data += *off / sizeof(uint32_t);
3060
3061 if (datasz < 2 * sizeof(uint32_t)) {
3062 goto error_data;
3063 }
3064 pr_type = data[0];
3065 pr_datasz = data[1];
3066 data += 2;
3067 datasz -= 2 * sizeof(uint32_t);
3068 step = ROUND_UP(pr_datasz, ELF_GNU_PROPERTY_ALIGN);
3069 if (step > datasz) {
3070 goto error_data;
3071 }
3072
3073 /* Properties are supposed to be unique and sorted on pr_type. */
3074 if (have_prev_type && pr_type <= *prev_type) {
3075 if (pr_type == *prev_type) {
3076 error_setg(errp, "Duplicate property in PT_GNU_PROPERTY");
3077 } else {
3078 error_setg(errp, "Unsorted property in PT_GNU_PROPERTY");
3079 }
3080 return false;
3081 }
3082 *prev_type = pr_type;
3083
3084 if (!arch_parse_elf_property(pr_type, pr_datasz, data, info, errp)) {
3085 return false;
3086 }
3087
3088 *off += 2 * sizeof(uint32_t) + step;
3089 return true;
3090
3091 error_data:
3092 error_setg(errp, "Ill-formed property in PT_GNU_PROPERTY");
3093 return false;
3094 }
3095
3096 /* Process NT_GNU_PROPERTY_TYPE_0. */
3097 static bool parse_elf_properties(int image_fd,
3098 struct image_info *info,
3099 const struct elf_phdr *phdr,
3100 char bprm_buf[BPRM_BUF_SIZE],
3101 Error **errp)
3102 {
3103 union {
3104 struct elf_note nhdr;
3105 uint32_t data[NOTE_DATA_SZ / sizeof(uint32_t)];
3106 } note;
3107
3108 int n, off, datasz;
3109 bool have_prev_type;
3110 uint32_t prev_type;
3111
3112 /* Unless the arch requires properties, ignore them. */
3113 if (!ARCH_USE_GNU_PROPERTY) {
3114 return true;
3115 }
3116
3117 /* If the properties are crazy large, that's too bad. */
3118 n = phdr->p_filesz;
3119 if (n > sizeof(note)) {
3120 error_setg(errp, "PT_GNU_PROPERTY too large");
3121 return false;
3122 }
3123 if (n < sizeof(note.nhdr)) {
3124 error_setg(errp, "PT_GNU_PROPERTY too small");
3125 return false;
3126 }
3127
3128 if (phdr->p_offset + n <= BPRM_BUF_SIZE) {
3129 memcpy(&note, bprm_buf + phdr->p_offset, n);
3130 } else {
3131 ssize_t len = pread(image_fd, &note, n, phdr->p_offset);
3132 if (len != n) {
3133 error_setg_errno(errp, errno, "Error reading file header");
3134 return false;
3135 }
3136 }
3137
3138 /*
3139 * The contents of a valid PT_GNU_PROPERTY is a sequence
3140 * of uint32_t -- swap them all now.
3141 */
3142 #ifdef BSWAP_NEEDED
3143 for (int i = 0; i < n / 4; i++) {
3144 bswap32s(note.data + i);
3145 }
3146 #endif
3147
3148 /*
3149 * Note that nhdr is 3 words, and that the "name" described by namesz
3150 * immediately follows nhdr and is thus at the 4th word. Further, all
3151 * of the inputs to the kernel's round_up are multiples of 4.
3152 */
3153 if (note.nhdr.n_type != NT_GNU_PROPERTY_TYPE_0 ||
3154 note.nhdr.n_namesz != NOTE_NAME_SZ ||
3155 note.data[3] != GNU0_MAGIC) {
3156 error_setg(errp, "Invalid note in PT_GNU_PROPERTY");
3157 return false;
3158 }
3159 off = sizeof(note.nhdr) + NOTE_NAME_SZ;
3160
3161 datasz = note.nhdr.n_descsz + off;
3162 if (datasz > n) {
3163 error_setg(errp, "Invalid note size in PT_GNU_PROPERTY");
3164 return false;
3165 }
3166
3167 have_prev_type = false;
3168 prev_type = 0;
3169 while (1) {
3170 if (off == datasz) {
3171 return true; /* end, exit ok */
3172 }
3173 if (!parse_elf_property(note.data, &off, datasz, info,
3174 have_prev_type, &prev_type, errp)) {
3175 return false;
3176 }
3177 have_prev_type = true;
3178 }
3179 }
3180
3181 /* Load an ELF image into the address space.
3182
3183 IMAGE_NAME is the filename of the image, to use in error messages.
3184 IMAGE_FD is the open file descriptor for the image.
3185
3186 BPRM_BUF is a copy of the beginning of the file; this of course
3187 contains the elf file header at offset 0. It is assumed that this
3188 buffer is sufficiently aligned to present no problems to the host
3189 in accessing data at aligned offsets within the buffer.
3190
3191 On return: INFO values will be filled in, as necessary or available. */
3192
3193 static void load_elf_image(const char *image_name, int image_fd,
3194 struct image_info *info, char **pinterp_name,
3195 char bprm_buf[BPRM_BUF_SIZE])
3196 {
3197 struct elfhdr *ehdr = (struct elfhdr *)bprm_buf;
3198 struct elf_phdr *phdr;
3199 abi_ulong load_addr, load_bias, loaddr, hiaddr, error;
3200 int i, retval, prot_exec;
3201 Error *err = NULL;
3202
3203 /* First of all, some simple consistency checks */
3204 if (!elf_check_ident(ehdr)) {
3205 error_setg(&err, "Invalid ELF image for this architecture");
3206 goto exit_errmsg;
3207 }
3208 bswap_ehdr(ehdr);
3209 if (!elf_check_ehdr(ehdr)) {
3210 error_setg(&err, "Invalid ELF image for this architecture");
3211 goto exit_errmsg;
3212 }
3213
3214 i = ehdr->e_phnum * sizeof(struct elf_phdr);
3215 if (ehdr->e_phoff + i <= BPRM_BUF_SIZE) {
3216 phdr = (struct elf_phdr *)(bprm_buf + ehdr->e_phoff);
3217 } else {
3218 phdr = (struct elf_phdr *) alloca(i);
3219 retval = pread(image_fd, phdr, i, ehdr->e_phoff);
3220 if (retval != i) {
3221 goto exit_read;
3222 }
3223 }
3224 bswap_phdr(phdr, ehdr->e_phnum);
3225
3226 info->nsegs = 0;
3227 info->pt_dynamic_addr = 0;
3228
3229 mmap_lock();
3230
3231 /*
3232 * Find the maximum size of the image and allocate an appropriate
3233 * amount of memory to handle that. Locate the interpreter, if any.
3234 */
3235 loaddr = -1, hiaddr = 0;
3236 info->alignment = 0;
3237 info->exec_stack = EXSTACK_DEFAULT;
3238 for (i = 0; i < ehdr->e_phnum; ++i) {
3239 struct elf_phdr *eppnt = phdr + i;
3240 if (eppnt->p_type == PT_LOAD) {
3241 abi_ulong a = eppnt->p_vaddr - eppnt->p_offset;
3242 if (a < loaddr) {
3243 loaddr = a;
3244 }
3245 a = eppnt->p_vaddr + eppnt->p_memsz - 1;
3246 if (a > hiaddr) {
3247 hiaddr = a;
3248 }
3249 ++info->nsegs;
3250 info->alignment |= eppnt->p_align;
3251 } else if (eppnt->p_type == PT_INTERP && pinterp_name) {
3252 g_autofree char *interp_name = NULL;
3253
3254 if (*pinterp_name) {
3255 error_setg(&err, "Multiple PT_INTERP entries");
3256 goto exit_errmsg;
3257 }
3258
3259 interp_name = g_malloc(eppnt->p_filesz);
3260
3261 if (eppnt->p_offset + eppnt->p_filesz <= BPRM_BUF_SIZE) {
3262 memcpy(interp_name, bprm_buf + eppnt->p_offset,
3263 eppnt->p_filesz);
3264 } else {
3265 retval = pread(image_fd, interp_name, eppnt->p_filesz,
3266 eppnt->p_offset);
3267 if (retval != eppnt->p_filesz) {
3268 goto exit_read;
3269 }
3270 }
3271 if (interp_name[eppnt->p_filesz - 1] != 0) {
3272 error_setg(&err, "Invalid PT_INTERP entry");
3273 goto exit_errmsg;
3274 }
3275 *pinterp_name = g_steal_pointer(&interp_name);
3276 } else if (eppnt->p_type == PT_GNU_PROPERTY) {
3277 if (!parse_elf_properties(image_fd, info, eppnt, bprm_buf, &err)) {
3278 goto exit_errmsg;
3279 }
3280 } else if (eppnt->p_type == PT_GNU_STACK) {
3281 info->exec_stack = eppnt->p_flags & PF_X;
3282 }
3283 }
3284
3285 load_addr = loaddr;
3286
3287 if (pinterp_name != NULL) {
3288 if (ehdr->e_type == ET_EXEC) {
3289 /*
3290 * Make sure that the low address does not conflict with
3291 * MMAP_MIN_ADDR or the QEMU application itself.
3292 */
3293 probe_guest_base(image_name, loaddr, hiaddr);
3294 } else {
3295 abi_ulong align;
3296
3297 /*
3298 * The binary is dynamic, but we still need to
3299 * select guest_base. In this case we pass a size.
3300 */
3301 probe_guest_base(image_name, 0, hiaddr - loaddr);
3302
3303 /*
3304 * Avoid collision with the loader by providing a different
3305 * default load address.
3306 */
3307 load_addr += elf_et_dyn_base;
3308
3309 /*
3310 * TODO: Better support for mmap alignment is desirable.
3311 * Since we do not have complete control over the guest
3312 * address space, we prefer the kernel to choose some address
3313 * rather than force the use of LOAD_ADDR via MAP_FIXED.
3314 * But without MAP_FIXED we cannot guarantee alignment,
3315 * only suggest it.
3316 */
3317 align = pow2ceil(info->alignment);
3318 if (align) {
3319 load_addr &= -align;
3320 }
3321 }
3322 }
3323
3324 /*
3325 * Reserve address space for all of this.
3326 *
3327 * In the case of ET_EXEC, we supply MAP_FIXED_NOREPLACE so that we get
3328 * exactly the address range that is required. Without reserved_va,
3329 * the guest address space is not isolated. We have attempted to avoid
3330 * conflict with the host program itself via probe_guest_base, but using
3331 * MAP_FIXED_NOREPLACE instead of MAP_FIXED provides an extra check.
3332 *
3333 * Otherwise this is ET_DYN, and we are searching for a location
3334 * that can hold the memory space required. If the image is
3335 * pre-linked, LOAD_ADDR will be non-zero, and the kernel should
3336 * honor that address if it happens to be free.
3337 *
3338 * In both cases, we will overwrite pages in this range with mappings
3339 * from the executable.
3340 */
3341 load_addr = target_mmap(load_addr, (size_t)hiaddr - loaddr + 1, PROT_NONE,
3342 MAP_PRIVATE | MAP_ANON | MAP_NORESERVE |
3343 (ehdr->e_type == ET_EXEC ? MAP_FIXED_NOREPLACE : 0),
3344 -1, 0);
3345 if (load_addr == -1) {
3346 goto exit_mmap;
3347 }
3348 load_bias = load_addr - loaddr;
3349
3350 if (elf_is_fdpic(ehdr)) {
3351 struct elf32_fdpic_loadseg *loadsegs = info->loadsegs =
3352 g_malloc(sizeof(*loadsegs) * info->nsegs);
3353
3354 for (i = 0; i < ehdr->e_phnum; ++i) {
3355 switch (phdr[i].p_type) {
3356 case PT_DYNAMIC:
3357 info->pt_dynamic_addr = phdr[i].p_vaddr + load_bias;
3358 break;
3359 case PT_LOAD:
3360 loadsegs->addr = phdr[i].p_vaddr + load_bias;
3361 loadsegs->p_vaddr = phdr[i].p_vaddr;
3362 loadsegs->p_memsz = phdr[i].p_memsz;
3363 ++loadsegs;
3364 break;
3365 }
3366 }
3367 }
3368
3369 info->load_bias = load_bias;
3370 info->code_offset = load_bias;
3371 info->data_offset = load_bias;
3372 info->load_addr = load_addr;
3373 info->entry = ehdr->e_entry + load_bias;
3374 info->start_code = -1;
3375 info->end_code = 0;
3376 info->start_data = -1;
3377 info->end_data = 0;
3378 /* Usual start for brk is after all sections of the main executable. */
3379 info->brk = TARGET_PAGE_ALIGN(hiaddr + load_bias);
3380 info->elf_flags = ehdr->e_flags;
3381
3382 prot_exec = PROT_EXEC;
3383 #ifdef TARGET_AARCH64
3384 /*
3385 * If the BTI feature is present, this indicates that the executable
3386 * pages of the startup binary should be mapped with PROT_BTI, so that
3387 * branch targets are enforced.
3388 *
3389 * The startup binary is either the interpreter or the static executable.
3390 * The interpreter is responsible for all pages of a dynamic executable.
3391 *
3392 * Elf notes are backward compatible to older cpus.
3393 * Do not enable BTI unless it is supported.
3394 */
3395 if ((info->note_flags & GNU_PROPERTY_AARCH64_FEATURE_1_BTI)
3396 && (pinterp_name == NULL || *pinterp_name == 0)
3397 && cpu_isar_feature(aa64_bti, ARM_CPU(thread_cpu))) {
3398 prot_exec |= TARGET_PROT_BTI;
3399 }
3400 #endif
3401
3402 for (i = 0; i < ehdr->e_phnum; i++) {
3403 struct elf_phdr *eppnt = phdr + i;
3404 if (eppnt->p_type == PT_LOAD) {
3405 abi_ulong vaddr, vaddr_po, vaddr_ps, vaddr_ef, vaddr_em;
3406 int elf_prot = 0;
3407
3408 if (eppnt->p_flags & PF_R) {
3409 elf_prot |= PROT_READ;
3410 }
3411 if (eppnt->p_flags & PF_W) {
3412 elf_prot |= PROT_WRITE;
3413 }
3414 if (eppnt->p_flags & PF_X) {
3415 elf_prot |= prot_exec;
3416 }
3417
3418 vaddr = load_bias + eppnt->p_vaddr;
3419 vaddr_po = vaddr & ~TARGET_PAGE_MASK;
3420 vaddr_ps = vaddr & TARGET_PAGE_MASK;
3421
3422 vaddr_ef = vaddr + eppnt->p_filesz;
3423 vaddr_em = vaddr + eppnt->p_memsz;
3424
3425 /*
3426 * Some segments may be completely empty, with a non-zero p_memsz
3427 * but no backing file segment.
3428 */
3429 if (eppnt->p_filesz != 0) {
3430 error = target_mmap(vaddr_ps, eppnt->p_filesz + vaddr_po,
3431 elf_prot, MAP_PRIVATE | MAP_FIXED,
3432 image_fd, eppnt->p_offset - vaddr_po);
3433 if (error == -1) {
3434 goto exit_mmap;
3435 }
3436 }
3437
3438 /* If the load segment requests extra zeros (e.g. bss), map it. */
3439 if (vaddr_ef < vaddr_em &&
3440 !zero_bss(vaddr_ef, vaddr_em, elf_prot, &err)) {
3441 goto exit_errmsg;
3442 }
3443
3444 /* Find the full program boundaries. */
3445 if (elf_prot & PROT_EXEC) {
3446 if (vaddr < info->start_code) {
3447 info->start_code = vaddr;
3448 }
3449 if (vaddr_ef > info->end_code) {
3450 info->end_code = vaddr_ef;
3451 }
3452 }
3453 if (elf_prot & PROT_WRITE) {
3454 if (vaddr < info->start_data) {
3455 info->start_data = vaddr;
3456 }
3457 if (vaddr_ef > info->end_data) {
3458 info->end_data = vaddr_ef;
3459 }
3460 }
3461 #ifdef TARGET_MIPS
3462 } else if (eppnt->p_type == PT_MIPS_ABIFLAGS) {
3463 Mips_elf_abiflags_v0 abiflags;
3464 if (eppnt->p_filesz < sizeof(Mips_elf_abiflags_v0)) {
3465 error_setg(&err, "Invalid PT_MIPS_ABIFLAGS entry");
3466 goto exit_errmsg;
3467 }
3468 if (eppnt->p_offset + eppnt->p_filesz <= BPRM_BUF_SIZE) {
3469 memcpy(&abiflags, bprm_buf + eppnt->p_offset,
3470 sizeof(Mips_elf_abiflags_v0));
3471 } else {
3472 retval = pread(image_fd, &abiflags, sizeof(Mips_elf_abiflags_v0),
3473 eppnt->p_offset);
3474 if (retval != sizeof(Mips_elf_abiflags_v0)) {
3475 goto exit_read;
3476 }
3477 }
3478 bswap_mips_abiflags(&abiflags);
3479 info->fp_abi = abiflags.fp_abi;
3480 #endif
3481 }
3482 }
3483
3484 if (info->end_data == 0) {
3485 info->start_data = info->end_code;
3486 info->end_data = info->end_code;
3487 }
3488
3489 if (qemu_log_enabled()) {
3490 load_symbols(ehdr, image_fd, load_bias);
3491 }
3492
3493 debuginfo_report_elf(image_name, image_fd, load_bias);
3494
3495 mmap_unlock();
3496
3497 close(image_fd);
3498 return;
3499
3500 exit_read:
3501 if (retval >= 0) {
3502 error_setg(&err, "Incomplete read of file header");
3503 } else {
3504 error_setg_errno(&err, errno, "Error reading file header");
3505 }
3506 goto exit_errmsg;
3507 exit_mmap:
3508 error_setg_errno(&err, errno, "Error mapping file");
3509 goto exit_errmsg;
3510 exit_errmsg:
3511 error_reportf_err(err, "%s: ", image_name);
3512 exit(-1);
3513 }
3514
3515 static void load_elf_interp(const char *filename, struct image_info *info,
3516 char bprm_buf[BPRM_BUF_SIZE])
3517 {
3518 int fd, retval;
3519 Error *err = NULL;
3520
3521 fd = open(path(filename), O_RDONLY);
3522 if (fd < 0) {
3523 error_setg_file_open(&err, errno, filename);
3524 error_report_err(err);
3525 exit(-1);
3526 }
3527
3528 retval = read(fd, bprm_buf, BPRM_BUF_SIZE);
3529 if (retval < 0) {
3530 error_setg_errno(&err, errno, "Error reading file header");
3531 error_reportf_err(err, "%s: ", filename);
3532 exit(-1);
3533 }
3534
3535 if (retval < BPRM_BUF_SIZE) {
3536 memset(bprm_buf + retval, 0, BPRM_BUF_SIZE - retval);
3537 }
3538
3539 load_elf_image(filename, fd, info, NULL, bprm_buf);
3540 }
3541
3542 static int symfind(const void *s0, const void *s1)
3543 {
3544 struct elf_sym *sym = (struct elf_sym *)s1;
3545 __typeof(sym->st_value) addr = *(uint64_t *)s0;
3546 int result = 0;
3547
3548 if (addr < sym->st_value) {
3549 result = -1;
3550 } else if (addr >= sym->st_value + sym->st_size) {
3551 result = 1;
3552 }
3553 return result;
3554 }
3555
3556 static const char *lookup_symbolxx(struct syminfo *s, uint64_t orig_addr)
3557 {
3558 #if ELF_CLASS == ELFCLASS32
3559 struct elf_sym *syms = s->disas_symtab.elf32;
3560 #else
3561 struct elf_sym *syms = s->disas_symtab.elf64;
3562 #endif
3563
3564 // binary search
3565 struct elf_sym *sym;
3566
3567 sym = bsearch(&orig_addr, syms, s->disas_num_syms, sizeof(*syms), symfind);
3568 if (sym != NULL) {
3569 return s->disas_strtab + sym->st_name;
3570 }
3571
3572 return "";
3573 }
3574
3575 /* FIXME: This should use elf_ops.h */
3576 static int symcmp(const void *s0, const void *s1)
3577 {
3578 struct elf_sym *sym0 = (struct elf_sym *)s0;
3579 struct elf_sym *sym1 = (struct elf_sym *)s1;
3580 return (sym0->st_value < sym1->st_value)
3581 ? -1
3582 : ((sym0->st_value > sym1->st_value) ? 1 : 0);
3583 }
3584
3585 /* Best attempt to load symbols from this ELF object. */
3586 static void load_symbols(struct elfhdr *hdr, int fd, abi_ulong load_bias)
3587 {
3588 int i, shnum, nsyms, sym_idx = 0, str_idx = 0;
3589 uint64_t segsz;
3590 struct elf_shdr *shdr;
3591 char *strings = NULL;
3592 struct syminfo *s = NULL;
3593 struct elf_sym *new_syms, *syms = NULL;
3594
3595 shnum = hdr->e_shnum;
3596 i = shnum * sizeof(struct elf_shdr);
3597 shdr = (struct elf_shdr *)alloca(i);
3598 if (pread(fd, shdr, i, hdr->e_shoff) != i) {
3599 return;
3600 }
3601
3602 bswap_shdr(shdr, shnum);
3603 for (i = 0; i < shnum; ++i) {
3604 if (shdr[i].sh_type == SHT_SYMTAB) {
3605 sym_idx = i;
3606 str_idx = shdr[i].sh_link;
3607 goto found;
3608 }
3609 }
3610
3611 /* There will be no symbol table if the file was stripped. */
3612 return;
3613
3614 found:
3615 /* Now know where the strtab and symtab are. Snarf them. */
3616 s = g_try_new(struct syminfo, 1);
3617 if (!s) {
3618 goto give_up;
3619 }
3620
3621 segsz = shdr[str_idx].sh_size;
3622 s->disas_strtab = strings = g_try_malloc(segsz);
3623 if (!strings ||
3624 pread(fd, strings, segsz, shdr[str_idx].sh_offset) != segsz) {
3625 goto give_up;
3626 }
3627
3628 segsz = shdr[sym_idx].sh_size;
3629 syms = g_try_malloc(segsz);
3630 if (!syms || pread(fd, syms, segsz, shdr[sym_idx].sh_offset) != segsz) {
3631 goto give_up;
3632 }
3633
3634 if (segsz / sizeof(struct elf_sym) > INT_MAX) {
3635 /* Implausibly large symbol table: give up rather than ploughing
3636 * on with the number of symbols calculation overflowing
3637 */
3638 goto give_up;
3639 }
3640 nsyms = segsz / sizeof(struct elf_sym);
3641 for (i = 0; i < nsyms; ) {
3642 bswap_sym(syms + i);
3643 /* Throw away entries which we do not need. */
3644 if (syms[i].st_shndx == SHN_UNDEF
3645 || syms[i].st_shndx >= SHN_LORESERVE
3646 || ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) {
3647 if (i < --nsyms) {
3648 syms[i] = syms[nsyms];
3649 }
3650 } else {
3651 #if defined(TARGET_ARM) || defined (TARGET_MIPS)
3652 /* The bottom address bit marks a Thumb or MIPS16 symbol. */
3653 syms[i].st_value &= ~(target_ulong)1;
3654 #endif
3655 syms[i].st_value += load_bias;
3656 i++;
3657 }
3658 }
3659
3660 /* No "useful" symbol. */
3661 if (nsyms == 0) {
3662 goto give_up;
3663 }
3664
3665 /* Attempt to free the storage associated with the local symbols
3666 that we threw away. Whether or not this has any effect on the
3667 memory allocation depends on the malloc implementation and how
3668 many symbols we managed to discard. */
3669 new_syms = g_try_renew(struct elf_sym, syms, nsyms);
3670 if (new_syms == NULL) {
3671 goto give_up;
3672 }
3673 syms = new_syms;
3674
3675 qsort(syms, nsyms, sizeof(*syms), symcmp);
3676
3677 s->disas_num_syms = nsyms;
3678 #if ELF_CLASS == ELFCLASS32
3679 s->disas_symtab.elf32 = syms;
3680 #else
3681 s->disas_symtab.elf64 = syms;
3682 #endif
3683 s->lookup_symbol = lookup_symbolxx;
3684 s->next = syminfos;
3685 syminfos = s;
3686
3687 return;
3688
3689 give_up:
3690 g_free(s);
3691 g_free(strings);
3692 g_free(syms);
3693 }
3694
3695 uint32_t get_elf_eflags(int fd)
3696 {
3697 struct elfhdr ehdr;
3698 off_t offset;
3699 int ret;
3700
3701 /* Read ELF header */
3702 offset = lseek(fd, 0, SEEK_SET);
3703 if (offset == (off_t) -1) {
3704 return 0;
3705 }
3706 ret = read(fd, &ehdr, sizeof(ehdr));
3707 if (ret < sizeof(ehdr)) {
3708 return 0;
3709 }
3710 offset = lseek(fd, offset, SEEK_SET);
3711 if (offset == (off_t) -1) {
3712 return 0;
3713 }
3714
3715 /* Check ELF signature */
3716 if (!elf_check_ident(&ehdr)) {
3717 return 0;
3718 }
3719
3720 /* check header */
3721 bswap_ehdr(&ehdr);
3722 if (!elf_check_ehdr(&ehdr)) {
3723 return 0;
3724 }
3725
3726 /* return architecture id */
3727 return ehdr.e_flags;
3728 }
3729
3730 int load_elf_binary(struct linux_binprm *bprm, struct image_info *info)
3731 {
3732 struct image_info interp_info;
3733 struct elfhdr elf_ex;
3734 char *elf_interpreter = NULL;
3735 char *scratch;
3736
3737 memset(&interp_info, 0, sizeof(interp_info));
3738 #ifdef TARGET_MIPS
3739 interp_info.fp_abi = MIPS_ABI_FP_UNKNOWN;
3740 #endif
3741
3742 load_elf_image(bprm->filename, bprm->fd, info,
3743 &elf_interpreter, bprm->buf);
3744
3745 /* ??? We need a copy of the elf header for passing to create_elf_tables.
3746 If we do nothing, we'll have overwritten this when we re-use bprm->buf
3747 when we load the interpreter. */
3748 elf_ex = *(struct elfhdr *)bprm->buf;
3749
3750 /* Do this so that we can load the interpreter, if need be. We will
3751 change some of these later */
3752 bprm->p = setup_arg_pages(bprm, info);
3753
3754 scratch = g_new0(char, TARGET_PAGE_SIZE);
3755 if (STACK_GROWS_DOWN) {
3756 bprm->p = copy_elf_strings(1, &bprm->filename, scratch,
3757 bprm->p, info->stack_limit);
3758 info->file_string = bprm->p;
3759 bprm->p = copy_elf_strings(bprm->envc, bprm->envp, scratch,
3760 bprm->p, info->stack_limit);
3761 info->env_strings = bprm->p;
3762 bprm->p = copy_elf_strings(bprm->argc, bprm->argv, scratch,
3763 bprm->p, info->stack_limit);
3764 info->arg_strings = bprm->p;
3765 } else {
3766 info->arg_strings = bprm->p;
3767 bprm->p = copy_elf_strings(bprm->argc, bprm->argv, scratch,
3768 bprm->p, info->stack_limit);
3769 info->env_strings = bprm->p;
3770 bprm->p = copy_elf_strings(bprm->envc, bprm->envp, scratch,
3771 bprm->p, info->stack_limit);
3772 info->file_string = bprm->p;
3773 bprm->p = copy_elf_strings(1, &bprm->filename, scratch,
3774 bprm->p, info->stack_limit);
3775 }
3776
3777 g_free(scratch);
3778
3779 if (!bprm->p) {
3780 fprintf(stderr, "%s: %s\n", bprm->filename, strerror(E2BIG));
3781 exit(-1);
3782 }
3783
3784 if (elf_interpreter) {
3785 load_elf_interp(elf_interpreter, &interp_info, bprm->buf);
3786
3787 /*
3788 * While unusual because of ELF_ET_DYN_BASE, if we are unlucky
3789 * with the mappings the interpreter can be loaded above but
3790 * near the main executable, which can leave very little room
3791 * for the heap.
3792 * If the current brk has less than 16MB, use the end of the
3793 * interpreter.
3794 */
3795 if (interp_info.brk > info->brk &&
3796 interp_info.load_bias - info->brk < 16 * MiB) {
3797 info->brk = interp_info.brk;
3798 }
3799
3800 /* If the program interpreter is one of these two, then assume
3801 an iBCS2 image. Otherwise assume a native linux image. */
3802
3803 if (strcmp(elf_interpreter, "/usr/lib/libc.so.1") == 0
3804 || strcmp(elf_interpreter, "/usr/lib/ld.so.1") == 0) {
3805 info->personality = PER_SVR4;
3806
3807 /* Why this, you ask??? Well SVr4 maps page 0 as read-only,
3808 and some applications "depend" upon this behavior. Since
3809 we do not have the power to recompile these, we emulate
3810 the SVr4 behavior. Sigh. */
3811 target_mmap(0, qemu_host_page_size, PROT_READ | PROT_EXEC,
3812 MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
3813 }
3814 #ifdef TARGET_MIPS
3815 info->interp_fp_abi = interp_info.fp_abi;
3816 #endif
3817 }
3818
3819 /*
3820 * TODO: load a vdso, which would also contain the signal trampolines.
3821 * Otherwise, allocate a private page to hold them.
3822 */
3823 if (TARGET_ARCH_HAS_SIGTRAMP_PAGE) {
3824 abi_long tramp_page = target_mmap(0, TARGET_PAGE_SIZE,
3825 PROT_READ | PROT_WRITE,
3826 MAP_PRIVATE | MAP_ANON, -1, 0);
3827 if (tramp_page == -1) {
3828 return -errno;
3829 }
3830
3831 setup_sigtramp(tramp_page);
3832 target_mprotect(tramp_page, TARGET_PAGE_SIZE, PROT_READ | PROT_EXEC);
3833 }
3834
3835 bprm->p = create_elf_tables(bprm->p, bprm->argc, bprm->envc, &elf_ex,
3836 info, (elf_interpreter ? &interp_info : NULL));
3837 info->start_stack = bprm->p;
3838
3839 /* If we have an interpreter, set that as the program's entry point.
3840 Copy the load_bias as well, to help PPC64 interpret the entry
3841 point as a function descriptor. Do this after creating elf tables
3842 so that we copy the original program entry point into the AUXV. */
3843 if (elf_interpreter) {
3844 info->load_bias = interp_info.load_bias;
3845 info->entry = interp_info.entry;
3846 g_free(elf_interpreter);
3847 }
3848
3849 #ifdef USE_ELF_CORE_DUMP
3850 bprm->core_dump = &elf_core_dump;
3851 #endif
3852
3853 return 0;
3854 }
3855
3856 #ifdef USE_ELF_CORE_DUMP
3857 /*
3858 * Definitions to generate Intel SVR4-like core files.
3859 * These mostly have the same names as the SVR4 types with "target_elf_"
3860 * tacked on the front to prevent clashes with linux definitions,
3861 * and the typedef forms have been avoided. This is mostly like
3862 * the SVR4 structure, but more Linuxy, with things that Linux does
3863 * not support and which gdb doesn't really use excluded.
3864 *
3865 * Fields we don't dump (their contents is zero) in linux-user qemu
3866 * are marked with XXX.
3867 *
3868 * Core dump code is copied from linux kernel (fs/binfmt_elf.c).
3869 *
3870 * Porting ELF coredump for target is (quite) simple process. First you
3871 * define USE_ELF_CORE_DUMP in target ELF code (where init_thread() for
3872 * the target resides):
3873 *
3874 * #define USE_ELF_CORE_DUMP
3875 *
3876 * Next you define type of register set used for dumping. ELF specification
3877 * says that it needs to be array of elf_greg_t that has size of ELF_NREG.
3878 *
3879 * typedef <target_regtype> target_elf_greg_t;
3880 * #define ELF_NREG <number of registers>
3881 * typedef taret_elf_greg_t target_elf_gregset_t[ELF_NREG];
3882 *
3883 * Last step is to implement target specific function that copies registers
3884 * from given cpu into just specified register set. Prototype is:
3885 *
3886 * static void elf_core_copy_regs(taret_elf_gregset_t *regs,
3887 * const CPUArchState *env);
3888 *
3889 * Parameters:
3890 * regs - copy register values into here (allocated and zeroed by caller)
3891 * env - copy registers from here
3892 *
3893 * Example for ARM target is provided in this file.
3894 */
3895
3896 /* An ELF note in memory */
3897 struct memelfnote {
3898 const char *name;
3899 size_t namesz;
3900 size_t namesz_rounded;
3901 int type;
3902 size_t datasz;
3903 size_t datasz_rounded;
3904 void *data;
3905 size_t notesz;
3906 };
3907
3908 struct target_elf_siginfo {
3909 abi_int si_signo; /* signal number */
3910 abi_int si_code; /* extra code */
3911 abi_int si_errno; /* errno */
3912 };
3913
3914 struct target_elf_prstatus {
3915 struct target_elf_siginfo pr_info; /* Info associated with signal */
3916 abi_short pr_cursig; /* Current signal */
3917 abi_ulong pr_sigpend; /* XXX */
3918 abi_ulong pr_sighold; /* XXX */
3919 target_pid_t pr_pid;
3920 target_pid_t pr_ppid;
3921 target_pid_t pr_pgrp;
3922 target_pid_t pr_sid;
3923 struct target_timeval pr_utime; /* XXX User time */
3924 struct target_timeval pr_stime; /* XXX System time */
3925 struct target_timeval pr_cutime; /* XXX Cumulative user time */
3926 struct target_timeval pr_cstime; /* XXX Cumulative system time */
3927 target_elf_gregset_t pr_reg; /* GP registers */
3928 abi_int pr_fpvalid; /* XXX */
3929 };
3930
3931 #define ELF_PRARGSZ (80) /* Number of chars for args */
3932
3933 struct target_elf_prpsinfo {
3934 char pr_state; /* numeric process state */
3935 char pr_sname; /* char for pr_state */
3936 char pr_zomb; /* zombie */
3937 char pr_nice; /* nice val */
3938 abi_ulong pr_flag; /* flags */
3939 target_uid_t pr_uid;
3940 target_gid_t pr_gid;
3941 target_pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
3942 /* Lots missing */
3943 char pr_fname[16] QEMU_NONSTRING; /* filename of executable */
3944 char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
3945 };
3946
3947 /* Here is the structure in which status of each thread is captured. */
3948 struct elf_thread_status {
3949 QTAILQ_ENTRY(elf_thread_status) ets_link;
3950 struct target_elf_prstatus prstatus; /* NT_PRSTATUS */
3951 #if 0
3952 elf_fpregset_t fpu; /* NT_PRFPREG */
3953 struct task_struct *thread;
3954 elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */
3955 #endif
3956 struct memelfnote notes[1];
3957 int num_notes;
3958 };
3959
3960 struct elf_note_info {
3961 struct memelfnote *notes;
3962 struct target_elf_prstatus *prstatus; /* NT_PRSTATUS */
3963 struct target_elf_prpsinfo *psinfo; /* NT_PRPSINFO */
3964
3965 QTAILQ_HEAD(, elf_thread_status) thread_list;
3966 #if 0
3967 /*
3968 * Current version of ELF coredump doesn't support
3969 * dumping fp regs etc.
3970 */
3971 elf_fpregset_t *fpu;
3972 elf_fpxregset_t *xfpu;
3973 int thread_status_size;
3974 #endif
3975 int notes_size;
3976 int numnote;
3977 };
3978
3979 struct vm_area_struct {
3980 target_ulong vma_start; /* start vaddr of memory region */
3981 target_ulong vma_end; /* end vaddr of memory region */
3982 abi_ulong vma_flags; /* protection etc. flags for the region */
3983 QTAILQ_ENTRY(vm_area_struct) vma_link;
3984 };
3985
3986 struct mm_struct {
3987 QTAILQ_HEAD(, vm_area_struct) mm_mmap;
3988 int mm_count; /* number of mappings */
3989 };
3990
3991 static struct mm_struct *vma_init(void);
3992 static void vma_delete(struct mm_struct *);
3993 static int vma_add_mapping(struct mm_struct *, target_ulong,
3994 target_ulong, abi_ulong);
3995 static int vma_get_mapping_count(const struct mm_struct *);
3996 static struct vm_area_struct *vma_first(const struct mm_struct *);
3997 static struct vm_area_struct *vma_next(struct vm_area_struct *);
3998 static abi_ulong vma_dump_size(const struct vm_area_struct *);
3999 static int vma_walker(void *priv, target_ulong start, target_ulong end,
4000 unsigned long flags);
4001
4002 static void fill_elf_header(struct elfhdr *, int, uint16_t, uint32_t);
4003 static void fill_note(struct memelfnote *, const char *, int,
4004 unsigned int, void *);
4005 static void fill_prstatus(struct target_elf_prstatus *, const TaskState *, int);
4006 static int fill_psinfo(struct target_elf_prpsinfo *, const TaskState *);
4007 static void fill_auxv_note(struct memelfnote *, const TaskState *);
4008 static void fill_elf_note_phdr(struct elf_phdr *, int, off_t);
4009 static size_t note_size(const struct memelfnote *);
4010 static void free_note_info(struct elf_note_info *);
4011 static int fill_note_info(struct elf_note_info *, long, const CPUArchState *);
4012 static void fill_thread_info(struct elf_note_info *, const CPUArchState *);
4013
4014 static int dump_write(int, const void *, size_t);
4015 static int write_note(struct memelfnote *, int);
4016 static int write_note_info(struct elf_note_info *, int);
4017
4018 #ifdef BSWAP_NEEDED
4019 static void bswap_prstatus(struct target_elf_prstatus *prstatus)
4020 {
4021 prstatus->pr_info.si_signo = tswap32(prstatus->pr_info.si_signo);
4022 prstatus->pr_info.si_code = tswap32(prstatus->pr_info.si_code);
4023 prstatus->pr_info.si_errno = tswap32(prstatus->pr_info.si_errno);
4024 prstatus->pr_cursig = tswap16(prstatus->pr_cursig);
4025 prstatus->pr_sigpend = tswapal(prstatus->pr_sigpend);
4026 prstatus->pr_sighold = tswapal(prstatus->pr_sighold);
4027 prstatus->pr_pid = tswap32(prstatus->pr_pid);
4028 prstatus->pr_ppid = tswap32(prstatus->pr_ppid);
4029 prstatus->pr_pgrp = tswap32(prstatus->pr_pgrp);
4030 prstatus->pr_sid = tswap32(prstatus->pr_sid);
4031 /* cpu times are not filled, so we skip them */
4032 /* regs should be in correct format already */
4033 prstatus->pr_fpvalid = tswap32(prstatus->pr_fpvalid);
4034 }
4035
4036 static void bswap_psinfo(struct target_elf_prpsinfo *psinfo)
4037 {
4038 psinfo->pr_flag = tswapal(psinfo->pr_flag);
4039 psinfo->pr_uid = tswap16(psinfo->pr_uid);
4040 psinfo->pr_gid = tswap16(psinfo->pr_gid);
4041 psinfo->pr_pid = tswap32(psinfo->pr_pid);
4042 psinfo->pr_ppid = tswap32(psinfo->pr_ppid);
4043 psinfo->pr_pgrp = tswap32(psinfo->pr_pgrp);
4044 psinfo->pr_sid = tswap32(psinfo->pr_sid);
4045 }
4046
4047 static void bswap_note(struct elf_note *en)
4048 {
4049 bswap32s(&en->n_namesz);
4050 bswap32s(&en->n_descsz);
4051 bswap32s(&en->n_type);
4052 }
4053 #else
4054 static inline void bswap_prstatus(struct target_elf_prstatus *p) { }
4055 static inline void bswap_psinfo(struct target_elf_prpsinfo *p) {}
4056 static inline void bswap_note(struct elf_note *en) { }
4057 #endif /* BSWAP_NEEDED */
4058
4059 /*
4060 * Minimal support for linux memory regions. These are needed
4061 * when we are finding out what memory exactly belongs to
4062 * emulated process. No locks needed here, as long as
4063 * thread that received the signal is stopped.
4064 */
4065
4066 static struct mm_struct *vma_init(void)
4067 {
4068 struct mm_struct *mm;
4069
4070 if ((mm = g_malloc(sizeof (*mm))) == NULL)
4071 return (NULL);
4072
4073 mm->mm_count = 0;
4074 QTAILQ_INIT(&mm->mm_mmap);
4075
4076 return (mm);
4077 }
4078
4079 static void vma_delete(struct mm_struct *mm)
4080 {
4081 struct vm_area_struct *vma;
4082
4083 while ((vma = vma_first(mm)) != NULL) {
4084 QTAILQ_REMOVE(&mm->mm_mmap, vma, vma_link);
4085 g_free(vma);
4086 }
4087 g_free(mm);
4088 }
4089
4090 static int vma_add_mapping(struct mm_struct *mm, target_ulong start,
4091 target_ulong end, abi_ulong flags)
4092 {
4093 struct vm_area_struct *vma;
4094
4095 if ((vma = g_malloc0(sizeof (*vma))) == NULL)
4096 return (-1);
4097
4098 vma->vma_start = start;
4099 vma->vma_end = end;
4100 vma->vma_flags = flags;
4101
4102 QTAILQ_INSERT_TAIL(&mm->mm_mmap, vma, vma_link);
4103 mm->mm_count++;
4104
4105 return (0);
4106 }
4107
4108 static struct vm_area_struct *vma_first(const struct mm_struct *mm)
4109 {
4110 return (QTAILQ_FIRST(&mm->mm_mmap));
4111 }
4112
4113 static struct vm_area_struct *vma_next(struct vm_area_struct *vma)
4114 {
4115 return (QTAILQ_NEXT(vma, vma_link));
4116 }
4117
4118 static int vma_get_mapping_count(const struct mm_struct *mm)
4119 {
4120 return (mm->mm_count);
4121 }
4122
4123 /*
4124 * Calculate file (dump) size of given memory region.
4125 */
4126 static abi_ulong vma_dump_size(const struct vm_area_struct *vma)
4127 {
4128 /* if we cannot even read the first page, skip it */
4129 if (!access_ok_untagged(VERIFY_READ, vma->vma_start, TARGET_PAGE_SIZE))
4130 return (0);
4131
4132 /*
4133 * Usually we don't dump executable pages as they contain
4134 * non-writable code that debugger can read directly from
4135 * target library etc. However, thread stacks are marked
4136 * also executable so we read in first page of given region
4137 * and check whether it contains elf header. If there is
4138 * no elf header, we dump it.
4139 */
4140 if (vma->vma_flags & PROT_EXEC) {
4141 char page[TARGET_PAGE_SIZE];
4142
4143 if (copy_from_user(page, vma->vma_start, sizeof (page))) {
4144 return 0;
4145 }
4146 if ((page[EI_MAG0] == ELFMAG0) &&
4147 (page[EI_MAG1] == ELFMAG1) &&
4148 (page[EI_MAG2] == ELFMAG2) &&
4149 (page[EI_MAG3] == ELFMAG3)) {
4150 /*
4151 * Mappings are possibly from ELF binary. Don't dump
4152 * them.
4153 */
4154 return (0);
4155 }
4156 }
4157
4158 return (vma->vma_end - vma->vma_start);
4159 }
4160
4161 static int vma_walker(void *priv, target_ulong start, target_ulong end,
4162 unsigned long flags)
4163 {
4164 struct mm_struct *mm = (struct mm_struct *)priv;
4165
4166 vma_add_mapping(mm, start, end, flags);
4167 return (0);
4168 }
4169
4170 static void fill_note(struct memelfnote *note, const char *name, int type,
4171 unsigned int sz, void *data)
4172 {
4173 unsigned int namesz;
4174
4175 namesz = strlen(name) + 1;
4176 note->name = name;
4177 note->namesz = namesz;
4178 note->namesz_rounded = roundup(namesz, sizeof (int32_t));
4179 note->type = type;
4180 note->datasz = sz;
4181 note->datasz_rounded = roundup(sz, sizeof (int32_t));
4182
4183 note->data = data;
4184
4185 /*
4186 * We calculate rounded up note size here as specified by
4187 * ELF document.
4188 */
4189 note->notesz = sizeof (struct elf_note) +
4190 note->namesz_rounded + note->datasz_rounded;
4191 }
4192
4193 static void fill_elf_header(struct elfhdr *elf, int segs, uint16_t machine,
4194 uint32_t flags)
4195 {
4196 (void) memset(elf, 0, sizeof(*elf));
4197
4198 (void) memcpy(elf->e_ident, ELFMAG, SELFMAG);
4199 elf->e_ident[EI_CLASS] = ELF_CLASS;
4200 elf->e_ident[EI_DATA] = ELF_DATA;
4201 elf->e_ident[EI_VERSION] = EV_CURRENT;
4202 elf->e_ident[EI_OSABI] = ELF_OSABI;
4203
4204 elf->e_type = ET_CORE;
4205 elf->e_machine = machine;
4206 elf->e_version = EV_CURRENT;
4207 elf->e_phoff = sizeof(struct elfhdr);
4208 elf->e_flags = flags;
4209 elf->e_ehsize = sizeof(struct elfhdr);
4210 elf->e_phentsize = sizeof(struct elf_phdr);
4211 elf->e_phnum = segs;
4212
4213 bswap_ehdr(elf);
4214 }
4215
4216 static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, off_t offset)
4217 {
4218 phdr->p_type = PT_NOTE;
4219 phdr->p_offset = offset;
4220 phdr->p_vaddr = 0;
4221 phdr->p_paddr = 0;
4222 phdr->p_filesz = sz;
4223 phdr->p_memsz = 0;
4224 phdr->p_flags = 0;
4225 phdr->p_align = 0;
4226
4227 bswap_phdr(phdr, 1);
4228 }
4229
4230 static size_t note_size(const struct memelfnote *note)
4231 {
4232 return (note->notesz);
4233 }
4234
4235 static void fill_prstatus(struct target_elf_prstatus *prstatus,
4236 const TaskState *ts, int signr)
4237 {
4238 (void) memset(prstatus, 0, sizeof (*prstatus));
4239 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
4240 prstatus->pr_pid = ts->ts_tid;
4241 prstatus->pr_ppid = getppid();
4242 prstatus->pr_pgrp = getpgrp();
4243 prstatus->pr_sid = getsid(0);
4244
4245 bswap_prstatus(prstatus);
4246 }
4247
4248 static int fill_psinfo(struct target_elf_prpsinfo *psinfo, const TaskState *ts)
4249 {
4250 char *base_filename;
4251 unsigned int i, len;
4252
4253 (void) memset(psinfo, 0, sizeof (*psinfo));
4254
4255 len = ts->info->env_strings - ts->info->arg_strings;
4256 if (len >= ELF_PRARGSZ)
4257 len = ELF_PRARGSZ - 1;
4258 if (copy_from_user(&psinfo->pr_psargs, ts->info->arg_strings, len)) {
4259 return -EFAULT;
4260 }
4261 for (i = 0; i < len; i++)
4262 if (psinfo->pr_psargs[i] == 0)
4263 psinfo->pr_psargs[i] = ' ';
4264 psinfo->pr_psargs[len] = 0;
4265
4266 psinfo->pr_pid = getpid();
4267 psinfo->pr_ppid = getppid();
4268 psinfo->pr_pgrp = getpgrp();
4269 psinfo->pr_sid = getsid(0);
4270 psinfo->pr_uid = getuid();
4271 psinfo->pr_gid = getgid();
4272
4273 base_filename = g_path_get_basename(ts->bprm->filename);
4274 /*
4275 * Using strncpy here is fine: at max-length,
4276 * this field is not NUL-terminated.
4277 */
4278 (void) strncpy(psinfo->pr_fname, base_filename,
4279 sizeof(psinfo->pr_fname));
4280
4281 g_free(base_filename);
4282 bswap_psinfo(psinfo);
4283 return (0);
4284 }
4285
4286 static void fill_auxv_note(struct memelfnote *note, const TaskState *ts)
4287 {
4288 elf_addr_t auxv = (elf_addr_t)ts->info->saved_auxv;
4289 elf_addr_t orig_auxv = auxv;
4290 void *ptr;
4291 int len = ts->info->auxv_len;
4292
4293 /*
4294 * Auxiliary vector is stored in target process stack. It contains
4295 * {type, value} pairs that we need to dump into note. This is not
4296 * strictly necessary but we do it here for sake of completeness.
4297 */
4298
4299 /* read in whole auxv vector and copy it to memelfnote */
4300 ptr = lock_user(VERIFY_READ, orig_auxv, len, 0);
4301 if (ptr != NULL) {
4302 fill_note(note, "CORE", NT_AUXV, len, ptr);
4303 unlock_user(ptr, auxv, len);
4304 }
4305 }
4306
4307 /*
4308 * Constructs name of coredump file. We have following convention
4309 * for the name:
4310 * qemu_<basename-of-target-binary>_<date>-<time>_<pid>.core
4311 *
4312 * Returns the filename
4313 */
4314 static char *core_dump_filename(const TaskState *ts)
4315 {
4316 g_autoptr(GDateTime) now = g_date_time_new_now_local();
4317 g_autofree char *nowstr = g_date_time_format(now, "%Y%m%d-%H%M%S");
4318 g_autofree char *base_filename = g_path_get_basename(ts->bprm->filename);
4319
4320 return g_strdup_printf("qemu_%s_%s_%d.core",
4321 base_filename, nowstr, (int)getpid());
4322 }
4323
4324 static int dump_write(int fd, const void *ptr, size_t size)
4325 {
4326 const char *bufp = (const char *)ptr;
4327 ssize_t bytes_written, bytes_left;
4328 struct rlimit dumpsize;
4329 off_t pos;
4330
4331 bytes_written = 0;
4332 getrlimit(RLIMIT_CORE, &dumpsize);
4333 if ((pos = lseek(fd, 0, SEEK_CUR))==-1) {
4334 if (errno == ESPIPE) { /* not a seekable stream */
4335 bytes_left = size;
4336 } else {
4337 return pos;
4338 }
4339 } else {
4340 if (dumpsize.rlim_cur <= pos) {
4341 return -1;
4342 } else if (dumpsize.rlim_cur == RLIM_INFINITY) {
4343 bytes_left = size;
4344 } else {
4345 size_t limit_left=dumpsize.rlim_cur - pos;
4346 bytes_left = limit_left >= size ? size : limit_left ;
4347 }
4348 }
4349
4350 /*
4351 * In normal conditions, single write(2) should do but
4352 * in case of socket etc. this mechanism is more portable.
4353 */
4354 do {
4355 bytes_written = write(fd, bufp, bytes_left);
4356 if (bytes_written < 0) {
4357 if (errno == EINTR)
4358 continue;
4359 return (-1);
4360 } else if (bytes_written == 0) { /* eof */
4361 return (-1);
4362 }
4363 bufp += bytes_written;
4364 bytes_left -= bytes_written;
4365 } while (bytes_left > 0);
4366
4367 return (0);
4368 }
4369
4370 static int write_note(struct memelfnote *men, int fd)
4371 {
4372 struct elf_note en;
4373
4374 en.n_namesz = men->namesz;
4375 en.n_type = men->type;
4376 en.n_descsz = men->datasz;
4377
4378 bswap_note(&en);
4379
4380 if (dump_write(fd, &en, sizeof(en)) != 0)
4381 return (-1);
4382 if (dump_write(fd, men->name, men->namesz_rounded) != 0)
4383 return (-1);
4384 if (dump_write(fd, men->data, men->datasz_rounded) != 0)
4385 return (-1);
4386
4387 return (0);
4388 }
4389
4390 static void fill_thread_info(struct elf_note_info *info, const CPUArchState *env)
4391 {
4392 CPUState *cpu = env_cpu((CPUArchState *)env);
4393 TaskState *ts = (TaskState *)cpu->opaque;
4394 struct elf_thread_status *ets;
4395
4396 ets = g_malloc0(sizeof (*ets));
4397 ets->num_notes = 1; /* only prstatus is dumped */
4398 fill_prstatus(&ets->prstatus, ts, 0);
4399 elf_core_copy_regs(&ets->prstatus.pr_reg, env);
4400 fill_note(&ets->notes[0], "CORE", NT_PRSTATUS, sizeof (ets->prstatus),
4401 &ets->prstatus);
4402
4403 QTAILQ_INSERT_TAIL(&info->thread_list, ets, ets_link);
4404
4405 info->notes_size += note_size(&ets->notes[0]);
4406 }
4407
4408 static void init_note_info(struct elf_note_info *info)
4409 {
4410 /* Initialize the elf_note_info structure so that it is at
4411 * least safe to call free_note_info() on it. Must be
4412 * called before calling fill_note_info().
4413 */
4414 memset(info, 0, sizeof (*info));
4415 QTAILQ_INIT(&info->thread_list);
4416 }
4417
4418 static int fill_note_info(struct elf_note_info *info,
4419 long signr, const CPUArchState *env)
4420 {
4421 #define NUMNOTES 3
4422 CPUState *cpu = env_cpu((CPUArchState *)env);
4423 TaskState *ts = (TaskState *)cpu->opaque;
4424 int i;
4425
4426 info->notes = g_new0(struct memelfnote, NUMNOTES);
4427 if (info->notes == NULL)
4428 return (-ENOMEM);
4429 info->prstatus = g_malloc0(sizeof (*info->prstatus));
4430 if (info->prstatus == NULL)
4431 return (-ENOMEM);
4432 info->psinfo = g_malloc0(sizeof (*info->psinfo));
4433 if (info->prstatus == NULL)
4434 return (-ENOMEM);
4435
4436 /*
4437 * First fill in status (and registers) of current thread
4438 * including process info & aux vector.
4439 */
4440 fill_prstatus(info->prstatus, ts, signr);
4441 elf_core_copy_regs(&info->prstatus->pr_reg, env);
4442 fill_note(&info->notes[0], "CORE", NT_PRSTATUS,
4443 sizeof (*info->prstatus), info->prstatus);
4444 fill_psinfo(info->psinfo, ts);
4445 fill_note(&info->notes[1], "CORE", NT_PRPSINFO,
4446 sizeof (*info->psinfo), info->psinfo);
4447 fill_auxv_note(&info->notes[2], ts);
4448 info->numnote = 3;
4449
4450 info->notes_size = 0;
4451 for (i = 0; i < info->numnote; i++)
4452 info->notes_size += note_size(&info->notes[i]);
4453
4454 /* read and fill status of all threads */
4455 WITH_QEMU_LOCK_GUARD(&qemu_cpu_list_lock) {
4456 CPU_FOREACH(cpu) {
4457 if (cpu == thread_cpu) {
4458 continue;
4459 }
4460 fill_thread_info(info, cpu_env(cpu));
4461 }
4462 }
4463
4464 return (0);
4465 }
4466
4467 static void free_note_info(struct elf_note_info *info)
4468 {
4469 struct elf_thread_status *ets;
4470
4471 while (!QTAILQ_EMPTY(&info->thread_list)) {
4472 ets = QTAILQ_FIRST(&info->thread_list);
4473 QTAILQ_REMOVE(&info->thread_list, ets, ets_link);
4474 g_free(ets);
4475 }
4476
4477 g_free(info->prstatus);
4478 g_free(info->psinfo);
4479 g_free(info->notes);
4480 }
4481
4482 static int write_note_info(struct elf_note_info *info, int fd)
4483 {
4484 struct elf_thread_status *ets;
4485 int i, error = 0;
4486
4487 /* write prstatus, psinfo and auxv for current thread */
4488 for (i = 0; i < info->numnote; i++)
4489 if ((error = write_note(&info->notes[i], fd)) != 0)
4490 return (error);
4491
4492 /* write prstatus for each thread */
4493 QTAILQ_FOREACH(ets, &info->thread_list, ets_link) {
4494 if ((error = write_note(&ets->notes[0], fd)) != 0)
4495 return (error);
4496 }
4497
4498 return (0);
4499 }
4500
4501 /*
4502 * Write out ELF coredump.
4503 *
4504 * See documentation of ELF object file format in:
4505 * http://www.caldera.com/developers/devspecs/gabi41.pdf
4506 *
4507 * Coredump format in linux is following:
4508 *
4509 * 0 +----------------------+ \
4510 * | ELF header | ET_CORE |
4511 * +----------------------+ |
4512 * | ELF program headers | |--- headers
4513 * | - NOTE section | |
4514 * | - PT_LOAD sections | |
4515 * +----------------------+ /
4516 * | NOTEs: |
4517 * | - NT_PRSTATUS |
4518 * | - NT_PRSINFO |
4519 * | - NT_AUXV |
4520 * +----------------------+ <-- aligned to target page
4521 * | Process memory dump |
4522 * : :
4523 * . .
4524 * : :
4525 * | |
4526 * +----------------------+
4527 *
4528 * NT_PRSTATUS -> struct elf_prstatus (per thread)
4529 * NT_PRSINFO -> struct elf_prpsinfo
4530 * NT_AUXV is array of { type, value } pairs (see fill_auxv_note()).
4531 *
4532 * Format follows System V format as close as possible. Current
4533 * version limitations are as follows:
4534 * - no floating point registers are dumped
4535 *
4536 * Function returns 0 in case of success, negative errno otherwise.
4537 *
4538 * TODO: make this work also during runtime: it should be
4539 * possible to force coredump from running process and then
4540 * continue processing. For example qemu could set up SIGUSR2
4541 * handler (provided that target process haven't registered
4542 * handler for that) that does the dump when signal is received.
4543 */
4544 static int elf_core_dump(int signr, const CPUArchState *env)
4545 {
4546 const CPUState *cpu = env_cpu((CPUArchState *)env);
4547 const TaskState *ts = (const TaskState *)cpu->opaque;
4548 struct vm_area_struct *vma = NULL;
4549 g_autofree char *corefile = NULL;
4550 struct elf_note_info info;
4551 struct elfhdr elf;
4552 struct elf_phdr phdr;
4553 struct rlimit dumpsize;
4554 struct mm_struct *mm = NULL;
4555 off_t offset = 0, data_offset = 0;
4556 int segs = 0;
4557 int fd = -1;
4558
4559 init_note_info(&info);
4560
4561 errno = 0;
4562 getrlimit(RLIMIT_CORE, &dumpsize);
4563 if (dumpsize.rlim_cur == 0)
4564 return 0;
4565
4566 corefile = core_dump_filename(ts);
4567
4568 if ((fd = open(corefile, O_WRONLY | O_CREAT,
4569 S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)) < 0)
4570 return (-errno);
4571
4572 /*
4573 * Walk through target process memory mappings and
4574 * set up structure containing this information. After
4575 * this point vma_xxx functions can be used.
4576 */
4577 if ((mm = vma_init()) == NULL)
4578 goto out;
4579
4580 walk_memory_regions(mm, vma_walker);
4581 segs = vma_get_mapping_count(mm);
4582
4583 /*
4584 * Construct valid coredump ELF header. We also
4585 * add one more segment for notes.
4586 */
4587 fill_elf_header(&elf, segs + 1, ELF_MACHINE, 0);
4588 if (dump_write(fd, &elf, sizeof (elf)) != 0)
4589 goto out;
4590
4591 /* fill in the in-memory version of notes */
4592 if (fill_note_info(&info, signr, env) < 0)
4593 goto out;
4594
4595 offset += sizeof (elf); /* elf header */
4596 offset += (segs + 1) * sizeof (struct elf_phdr); /* program headers */
4597
4598 /* write out notes program header */
4599 fill_elf_note_phdr(&phdr, info.notes_size, offset);
4600
4601 offset += info.notes_size;
4602 if (dump_write(fd, &phdr, sizeof (phdr)) != 0)
4603 goto out;
4604
4605 /*
4606 * ELF specification wants data to start at page boundary so
4607 * we align it here.
4608 */
4609 data_offset = offset = roundup(offset, ELF_EXEC_PAGESIZE);
4610
4611 /*
4612 * Write program headers for memory regions mapped in
4613 * the target process.
4614 */
4615 for (vma = vma_first(mm); vma != NULL; vma = vma_next(vma)) {
4616 (void) memset(&phdr, 0, sizeof (phdr));
4617
4618 phdr.p_type = PT_LOAD;
4619 phdr.p_offset = offset;
4620 phdr.p_vaddr = vma->vma_start;
4621 phdr.p_paddr = 0;
4622 phdr.p_filesz = vma_dump_size(vma);
4623 offset += phdr.p_filesz;
4624 phdr.p_memsz = vma->vma_end - vma->vma_start;
4625 phdr.p_flags = vma->vma_flags & PROT_READ ? PF_R : 0;
4626 if (vma->vma_flags & PROT_WRITE)
4627 phdr.p_flags |= PF_W;
4628 if (vma->vma_flags & PROT_EXEC)
4629 phdr.p_flags |= PF_X;
4630 phdr.p_align = ELF_EXEC_PAGESIZE;
4631
4632 bswap_phdr(&phdr, 1);
4633 if (dump_write(fd, &phdr, sizeof(phdr)) != 0) {
4634 goto out;
4635 }
4636 }
4637
4638 /*
4639 * Next we write notes just after program headers. No
4640 * alignment needed here.
4641 */
4642 if (write_note_info(&info, fd) < 0)
4643 goto out;
4644
4645 /* align data to page boundary */
4646 if (lseek(fd, data_offset, SEEK_SET) != data_offset)
4647 goto out;
4648
4649 /*
4650 * Finally we can dump process memory into corefile as well.
4651 */
4652 for (vma = vma_first(mm); vma != NULL; vma = vma_next(vma)) {
4653 abi_ulong addr;
4654 abi_ulong end;
4655
4656 end = vma->vma_start + vma_dump_size(vma);
4657
4658 for (addr = vma->vma_start; addr < end;
4659 addr += TARGET_PAGE_SIZE) {
4660 char page[TARGET_PAGE_SIZE];
4661 int error;
4662
4663 /*
4664 * Read in page from target process memory and
4665 * write it to coredump file.
4666 */
4667 error = copy_from_user(page, addr, sizeof (page));
4668 if (error != 0) {
4669 (void) fprintf(stderr, "unable to dump " TARGET_ABI_FMT_lx "\n",
4670 addr);
4671 errno = -error;
4672 goto out;
4673 }
4674 if (dump_write(fd, page, TARGET_PAGE_SIZE) < 0)
4675 goto out;
4676 }
4677 }
4678
4679 out:
4680 free_note_info(&info);
4681 if (mm != NULL)
4682 vma_delete(mm);
4683 (void) close(fd);
4684
4685 if (errno != 0)
4686 return (-errno);
4687 return (0);
4688 }
4689 #endif /* USE_ELF_CORE_DUMP */
4690
4691 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop)
4692 {
4693 init_thread(regs, infop);
4694 }
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