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1 /*
2 * qemu bsd user mode definition
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
16 */
17 #ifndef QEMU_H
18 #define QEMU_H
19
20 #include "qemu/osdep.h"
21 #include "cpu.h"
22 #include "qemu/units.h"
23 #include "exec/cpu_ldst.h"
24 #include "exec/exec-all.h"
25
26 #undef DEBUG_REMAP
27
28 #include "exec/user/abitypes.h"
29
30 extern char **environ;
31
32 #include "exec/user/thunk.h"
33 #include "target_arch.h"
34 #include "syscall_defs.h"
35 #include "target_syscall.h"
36 #include "target_os_vmparam.h"
37 #include "target_os_signal.h"
38 #include "exec/gdbstub.h"
39
40 /*
41 * This struct is used to hold certain information about the image. Basically,
42 * it replicates in user space what would be certain task_struct fields in the
43 * kernel
44 */
45 struct image_info {
46 abi_ulong load_bias;
47 abi_ulong load_addr;
48 abi_ulong start_code;
49 abi_ulong end_code;
50 abi_ulong start_data;
51 abi_ulong end_data;
52 abi_ulong start_brk;
53 abi_ulong brk;
54 abi_ulong start_mmap;
55 abi_ulong mmap;
56 abi_ulong rss;
57 abi_ulong start_stack;
58 abi_ulong entry;
59 abi_ulong code_offset;
60 abi_ulong data_offset;
61 abi_ulong arg_start;
62 abi_ulong arg_end;
63 uint32_t elf_flags;
64 };
65
66 struct emulated_sigtable {
67 int pending; /* true if signal is pending */
68 target_siginfo_t info;
69 };
70
71 /*
72 * NOTE: we force a big alignment so that the stack stored after is aligned too
73 */
74 typedef struct TaskState {
75 pid_t ts_tid; /* tid (or pid) of this task */
76
77 struct TaskState *next;
78 struct bsd_binprm *bprm;
79 struct image_info *info;
80
81 struct emulated_sigtable sync_signal;
82 /*
83 * TODO: Since we block all signals while returning to the main CPU
84 * loop, this needn't be an array
85 */
86 struct emulated_sigtable sigtab[TARGET_NSIG];
87 /*
88 * Nonzero if process_pending_signals() needs to do something (either
89 * handle a pending signal or unblock signals).
90 * This flag is written from a signal handler so should be accessed via
91 * the qatomic_read() and qatomic_set() functions. (It is not accessed
92 * from multiple threads.)
93 */
94 int signal_pending;
95 /* True if we're leaving a sigsuspend and sigsuspend_mask is valid. */
96 bool in_sigsuspend;
97 /*
98 * This thread's signal mask, as requested by the guest program.
99 * The actual signal mask of this thread may differ:
100 * + we don't let SIGSEGV and SIGBUS be blocked while running guest code
101 * + sometimes we block all signals to avoid races
102 */
103 sigset_t signal_mask;
104 /*
105 * The signal mask imposed by a guest sigsuspend syscall, if we are
106 * currently in the middle of such a syscall
107 */
108 sigset_t sigsuspend_mask;
109
110 /* This thread's sigaltstack, if it has one */
111 struct target_sigaltstack sigaltstack_used;
112 } __attribute__((aligned(16))) TaskState;
113
114 void stop_all_tasks(void);
115 extern const char *qemu_uname_release;
116
117 /*
118 * TARGET_ARG_MAX defines the number of bytes allocated for arguments
119 * and envelope for the new program. 256k should suffice for a reasonable
120 * maxiumum env+arg in 32-bit environments, bump it up to 512k for !ILP32
121 * platforms.
122 */
123 #if TARGET_ABI_BITS > 32
124 #define TARGET_ARG_MAX (512 * KiB)
125 #else
126 #define TARGET_ARG_MAX (256 * KiB)
127 #endif
128 #define MAX_ARG_PAGES (TARGET_ARG_MAX / TARGET_PAGE_SIZE)
129
130 /*
131 * This structure is used to hold the arguments that are
132 * used when loading binaries.
133 */
134 struct bsd_binprm {
135 char buf[128];
136 void *page[MAX_ARG_PAGES];
137 abi_ulong p;
138 abi_ulong stringp;
139 int fd;
140 int e_uid, e_gid;
141 int argc, envc;
142 char **argv;
143 char **envp;
144 char *filename; /* (Given) Name of binary */
145 char *fullpath; /* Full path of binary */
146 int (*core_dump)(int, CPUArchState *);
147 };
148
149 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop);
150 abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
151 abi_ulong stringp);
152 int loader_exec(const char *filename, char **argv, char **envp,
153 struct target_pt_regs *regs, struct image_info *infop,
154 struct bsd_binprm *bprm);
155
156 int load_elf_binary(struct bsd_binprm *bprm, struct target_pt_regs *regs,
157 struct image_info *info);
158 int load_flt_binary(struct bsd_binprm *bprm, struct target_pt_regs *regs,
159 struct image_info *info);
160 int is_target_elf_binary(int fd);
161
162 abi_long memcpy_to_target(abi_ulong dest, const void *src,
163 unsigned long len);
164 void target_set_brk(abi_ulong new_brk);
165 abi_long do_brk(abi_ulong new_brk);
166 void syscall_init(void);
167 abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1,
168 abi_long arg2, abi_long arg3, abi_long arg4,
169 abi_long arg5, abi_long arg6, abi_long arg7,
170 abi_long arg8);
171 abi_long do_netbsd_syscall(void *cpu_env, int num, abi_long arg1,
172 abi_long arg2, abi_long arg3, abi_long arg4,
173 abi_long arg5, abi_long arg6);
174 abi_long do_openbsd_syscall(void *cpu_env, int num, abi_long arg1,
175 abi_long arg2, abi_long arg3, abi_long arg4,
176 abi_long arg5, abi_long arg6);
177 void gemu_log(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
178 extern __thread CPUState *thread_cpu;
179 void cpu_loop(CPUArchState *env);
180 char *target_strerror(int err);
181 int get_osversion(void);
182 void fork_start(void);
183 void fork_end(int child);
184
185 #include "qemu/log.h"
186
187 /* strace.c */
188 struct syscallname {
189 int nr;
190 const char *name;
191 const char *format;
192 void (*call)(const struct syscallname *,
193 abi_long, abi_long, abi_long,
194 abi_long, abi_long, abi_long);
195 void (*result)(const struct syscallname *, abi_long);
196 };
197
198 void
199 print_freebsd_syscall(int num,
200 abi_long arg1, abi_long arg2, abi_long arg3,
201 abi_long arg4, abi_long arg5, abi_long arg6);
202 void print_freebsd_syscall_ret(int num, abi_long ret);
203 void
204 print_netbsd_syscall(int num,
205 abi_long arg1, abi_long arg2, abi_long arg3,
206 abi_long arg4, abi_long arg5, abi_long arg6);
207 void print_netbsd_syscall_ret(int num, abi_long ret);
208 void
209 print_openbsd_syscall(int num,
210 abi_long arg1, abi_long arg2, abi_long arg3,
211 abi_long arg4, abi_long arg5, abi_long arg6);
212 void print_openbsd_syscall_ret(int num, abi_long ret);
213 /**
214 * print_taken_signal:
215 * @target_signum: target signal being taken
216 * @tinfo: target_siginfo_t which will be passed to the guest for the signal
217 *
218 * Print strace output indicating that this signal is being taken by the guest,
219 * in a format similar to:
220 * --- SIGSEGV {si_signo=SIGSEGV, si_code=SI_KERNEL, si_addr=0} ---
221 */
222 void print_taken_signal(int target_signum, const target_siginfo_t *tinfo);
223 extern int do_strace;
224
225 /* mmap.c */
226 int target_mprotect(abi_ulong start, abi_ulong len, int prot);
227 abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
228 int flags, int fd, off_t offset);
229 int target_munmap(abi_ulong start, abi_ulong len);
230 abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
231 abi_ulong new_size, unsigned long flags,
232 abi_ulong new_addr);
233 int target_msync(abi_ulong start, abi_ulong len, int flags);
234 extern unsigned long last_brk;
235 extern abi_ulong mmap_next_start;
236 abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size);
237 void mmap_fork_start(void);
238 void mmap_fork_end(int child);
239
240 /* main.c */
241 extern char qemu_proc_pathname[];
242 extern unsigned long target_maxtsiz;
243 extern unsigned long target_dfldsiz;
244 extern unsigned long target_maxdsiz;
245 extern unsigned long target_dflssiz;
246 extern unsigned long target_maxssiz;
247 extern unsigned long target_sgrowsiz;
248
249 /* syscall.c */
250 abi_long get_errno(abi_long ret);
251 bool is_error(abi_long ret);
252
253 /* os-sys.c */
254 abi_long do_freebsd_sysarch(void *cpu_env, abi_long arg1, abi_long arg2);
255
256 /* user access */
257
258 #define VERIFY_READ PAGE_READ
259 #define VERIFY_WRITE (PAGE_READ | PAGE_WRITE)
260
261 static inline bool access_ok(int type, abi_ulong addr, abi_ulong size)
262 {
263 return page_check_range((target_ulong)addr, size, type) == 0;
264 }
265
266 /*
267 * NOTE __get_user and __put_user use host pointers and don't check access.
268 *
269 * These are usually used to access struct data members once the struct has been
270 * locked - usually with lock_user_struct().
271 */
272 #define __put_user(x, hptr)\
273 ({\
274 int size = sizeof(*hptr);\
275 switch (size) {\
276 case 1:\
277 *(uint8_t *)(hptr) = (uint8_t)(typeof(*hptr))(x);\
278 break;\
279 case 2:\
280 *(uint16_t *)(hptr) = tswap16((typeof(*hptr))(x));\
281 break;\
282 case 4:\
283 *(uint32_t *)(hptr) = tswap32((typeof(*hptr))(x));\
284 break;\
285 case 8:\
286 *(uint64_t *)(hptr) = tswap64((typeof(*hptr))(x));\
287 break;\
288 default:\
289 abort();\
290 } \
291 0;\
292 })
293
294 #define __get_user(x, hptr) \
295 ({\
296 int size = sizeof(*hptr);\
297 switch (size) {\
298 case 1:\
299 x = (typeof(*hptr))*(uint8_t *)(hptr);\
300 break;\
301 case 2:\
302 x = (typeof(*hptr))tswap16(*(uint16_t *)(hptr));\
303 break;\
304 case 4:\
305 x = (typeof(*hptr))tswap32(*(uint32_t *)(hptr));\
306 break;\
307 case 8:\
308 x = (typeof(*hptr))tswap64(*(uint64_t *)(hptr));\
309 break;\
310 default:\
311 x = 0;\
312 abort();\
313 } \
314 0;\
315 })
316
317 /*
318 * put_user()/get_user() take a guest address and check access
319 *
320 * These are usually used to access an atomic data type, such as an int, that
321 * has been passed by address. These internally perform locking and unlocking
322 * on the data type.
323 */
324 #define put_user(x, gaddr, target_type) \
325 ({ \
326 abi_ulong __gaddr = (gaddr); \
327 target_type *__hptr; \
328 abi_long __ret; \
329 __hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0); \
330 if (__hptr) { \
331 __ret = __put_user((x), __hptr); \
332 unlock_user(__hptr, __gaddr, sizeof(target_type)); \
333 } else \
334 __ret = -TARGET_EFAULT; \
335 __ret; \
336 })
337
338 #define get_user(x, gaddr, target_type) \
339 ({ \
340 abi_ulong __gaddr = (gaddr); \
341 target_type *__hptr; \
342 abi_long __ret; \
343 __hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1); \
344 if (__hptr) { \
345 __ret = __get_user((x), __hptr); \
346 unlock_user(__hptr, __gaddr, 0); \
347 } else { \
348 (x) = 0; \
349 __ret = -TARGET_EFAULT; \
350 } \
351 __ret; \
352 })
353
354 #define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong)
355 #define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long)
356 #define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t)
357 #define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t)
358 #define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t)
359 #define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t)
360 #define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t)
361 #define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t)
362 #define put_user_u8(x, gaddr) put_user((x), (gaddr), uint8_t)
363 #define put_user_s8(x, gaddr) put_user((x), (gaddr), int8_t)
364
365 #define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong)
366 #define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long)
367 #define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t)
368 #define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t)
369 #define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t)
370 #define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t)
371 #define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t)
372 #define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t)
373 #define get_user_u8(x, gaddr) get_user((x), (gaddr), uint8_t)
374 #define get_user_s8(x, gaddr) get_user((x), (gaddr), int8_t)
375
376 /*
377 * copy_from_user() and copy_to_user() are usually used to copy data
378 * buffers between the target and host. These internally perform
379 * locking/unlocking of the memory.
380 */
381 abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
382 abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
383
384 /*
385 * Functions for accessing guest memory. The tget and tput functions
386 * read/write single values, byteswapping as necessary. The lock_user function
387 * gets a pointer to a contiguous area of guest memory, but does not perform
388 * any byteswapping. lock_user may return either a pointer to the guest
389 * memory, or a temporary buffer.
390 */
391
392 /*
393 * Lock an area of guest memory into the host. If copy is true then the
394 * host area will have the same contents as the guest.
395 */
396 static inline void *lock_user(int type, abi_ulong guest_addr, long len,
397 int copy)
398 {
399 if (!access_ok(type, guest_addr, len)) {
400 return NULL;
401 }
402 #ifdef DEBUG_REMAP
403 {
404 void *addr;
405 addr = g_malloc(len);
406 if (copy) {
407 memcpy(addr, g2h_untagged(guest_addr), len);
408 } else {
409 memset(addr, 0, len);
410 }
411 return addr;
412 }
413 #else
414 return g2h_untagged(guest_addr);
415 #endif
416 }
417
418 /*
419 * Unlock an area of guest memory. The first LEN bytes must be flushed back to
420 * guest memory. host_ptr = NULL is explicitly allowed and does nothing.
421 */
422 static inline void unlock_user(void *host_ptr, abi_ulong guest_addr,
423 long len)
424 {
425
426 #ifdef DEBUG_REMAP
427 if (!host_ptr) {
428 return;
429 }
430 if (host_ptr == g2h_untagged(guest_addr)) {
431 return;
432 }
433 if (len > 0) {
434 memcpy(g2h_untagged(guest_addr), host_ptr, len);
435 }
436 g_free(host_ptr);
437 #endif
438 }
439
440 /*
441 * Return the length of a string in target memory or -TARGET_EFAULT if access
442 * error.
443 */
444 abi_long target_strlen(abi_ulong gaddr);
445
446 /* Like lock_user but for null terminated strings. */
447 static inline void *lock_user_string(abi_ulong guest_addr)
448 {
449 abi_long len;
450 len = target_strlen(guest_addr);
451 if (len < 0) {
452 return NULL;
453 }
454 return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1);
455 }
456
457 /* Helper macros for locking/unlocking a target struct. */
458 #define lock_user_struct(type, host_ptr, guest_addr, copy) \
459 (host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy))
460 #define unlock_user_struct(host_ptr, guest_addr, copy) \
461 unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
462
463 #include <pthread.h>
464
465 #include "user/safe-syscall.h"
466
467 #endif /* QEMU_H */