]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Written 2000,2002 by Andi Kleen. | |
3 | * | |
4 | * Loosely based on the sparc64 and IA64 32bit emulation loaders. | |
5 | * This tricks binfmt_elf.c into loading 32bit binaries using lots | |
6 | * of ugly preprocessor tricks. Talk about very very poor man's inheritance. | |
7 | */ | |
8 | #include <linux/types.h> | |
1da177e4 LT |
9 | #include <linux/stddef.h> |
10 | #include <linux/rwsem.h> | |
11 | #include <linux/sched.h> | |
12 | #include <linux/compat.h> | |
13 | #include <linux/string.h> | |
14 | #include <linux/binfmts.h> | |
15 | #include <linux/mm.h> | |
16 | #include <linux/security.h> | |
17 | ||
18 | #include <asm/segment.h> | |
19 | #include <asm/ptrace.h> | |
20 | #include <asm/processor.h> | |
21 | #include <asm/user32.h> | |
22 | #include <asm/sigcontext32.h> | |
23 | #include <asm/fpu32.h> | |
24 | #include <asm/i387.h> | |
25 | #include <asm/uaccess.h> | |
26 | #include <asm/ia32.h> | |
27 | #include <asm/vsyscall32.h> | |
28 | ||
29 | #define ELF_NAME "elf/i386" | |
30 | ||
31 | #define AT_SYSINFO 32 | |
32 | #define AT_SYSINFO_EHDR 33 | |
33 | ||
34 | int sysctl_vsyscall32 = 1; | |
35 | ||
36 | #define ARCH_DLINFO do { \ | |
37 | if (sysctl_vsyscall32) { \ | |
38 | NEW_AUX_ENT(AT_SYSINFO, (u32)(u64)VSYSCALL32_VSYSCALL); \ | |
39 | NEW_AUX_ENT(AT_SYSINFO_EHDR, VSYSCALL32_BASE); \ | |
40 | } \ | |
41 | } while(0) | |
42 | ||
43 | struct file; | |
44 | struct elf_phdr; | |
45 | ||
46 | #define IA32_EMULATOR 1 | |
47 | ||
84929801 | 48 | #define ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE + 0x1000000) |
1da177e4 LT |
49 | |
50 | #undef ELF_ARCH | |
51 | #define ELF_ARCH EM_386 | |
52 | ||
53 | #undef ELF_CLASS | |
54 | #define ELF_CLASS ELFCLASS32 | |
55 | ||
56 | #define ELF_DATA ELFDATA2LSB | |
57 | ||
58 | #define USE_ELF_CORE_DUMP 1 | |
59 | ||
e6fc99c6 | 60 | /* Override elfcore.h */ |
1da177e4 LT |
61 | #define _LINUX_ELFCORE_H 1 |
62 | typedef unsigned int elf_greg_t; | |
63 | ||
64 | #define ELF_NGREG (sizeof (struct user_regs_struct32) / sizeof(elf_greg_t)) | |
65 | typedef elf_greg_t elf_gregset_t[ELF_NGREG]; | |
66 | ||
1da177e4 LT |
67 | struct elf_siginfo |
68 | { | |
69 | int si_signo; /* signal number */ | |
70 | int si_code; /* extra code */ | |
71 | int si_errno; /* errno */ | |
72 | }; | |
73 | ||
74 | #define jiffies_to_timeval(a,b) do { (b)->tv_usec = 0; (b)->tv_sec = (a)/HZ; }while(0) | |
75 | ||
76 | struct elf_prstatus | |
77 | { | |
78 | struct elf_siginfo pr_info; /* Info associated with signal */ | |
79 | short pr_cursig; /* Current signal */ | |
80 | unsigned int pr_sigpend; /* Set of pending signals */ | |
81 | unsigned int pr_sighold; /* Set of held signals */ | |
82 | pid_t pr_pid; | |
83 | pid_t pr_ppid; | |
84 | pid_t pr_pgrp; | |
85 | pid_t pr_sid; | |
86 | struct compat_timeval pr_utime; /* User time */ | |
87 | struct compat_timeval pr_stime; /* System time */ | |
88 | struct compat_timeval pr_cutime; /* Cumulative user time */ | |
89 | struct compat_timeval pr_cstime; /* Cumulative system time */ | |
90 | elf_gregset_t pr_reg; /* GP registers */ | |
91 | int pr_fpvalid; /* True if math co-processor being used. */ | |
92 | }; | |
93 | ||
94 | #define ELF_PRARGSZ (80) /* Number of chars for args */ | |
95 | ||
96 | struct elf_prpsinfo | |
97 | { | |
98 | char pr_state; /* numeric process state */ | |
99 | char pr_sname; /* char for pr_state */ | |
100 | char pr_zomb; /* zombie */ | |
101 | char pr_nice; /* nice val */ | |
102 | unsigned int pr_flag; /* flags */ | |
103 | __u16 pr_uid; | |
104 | __u16 pr_gid; | |
105 | pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid; | |
106 | /* Lots missing */ | |
107 | char pr_fname[16]; /* filename of executable */ | |
108 | char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */ | |
109 | }; | |
110 | ||
111 | #define __STR(x) #x | |
112 | #define STR(x) __STR(x) | |
113 | ||
114 | #define _GET_SEG(x) \ | |
115 | ({ __u32 seg; asm("movl %%" STR(x) ",%0" : "=r"(seg)); seg; }) | |
116 | ||
117 | /* Assumes current==process to be dumped */ | |
118 | #define ELF_CORE_COPY_REGS(pr_reg, regs) \ | |
119 | pr_reg[0] = regs->rbx; \ | |
120 | pr_reg[1] = regs->rcx; \ | |
121 | pr_reg[2] = regs->rdx; \ | |
122 | pr_reg[3] = regs->rsi; \ | |
123 | pr_reg[4] = regs->rdi; \ | |
124 | pr_reg[5] = regs->rbp; \ | |
125 | pr_reg[6] = regs->rax; \ | |
126 | pr_reg[7] = _GET_SEG(ds); \ | |
127 | pr_reg[8] = _GET_SEG(es); \ | |
128 | pr_reg[9] = _GET_SEG(fs); \ | |
129 | pr_reg[10] = _GET_SEG(gs); \ | |
130 | pr_reg[11] = regs->orig_rax; \ | |
131 | pr_reg[12] = regs->rip; \ | |
132 | pr_reg[13] = regs->cs; \ | |
133 | pr_reg[14] = regs->eflags; \ | |
134 | pr_reg[15] = regs->rsp; \ | |
135 | pr_reg[16] = regs->ss; | |
136 | ||
137 | #define user user32 | |
138 | ||
139 | #define __ASM_X86_64_ELF_H 1 | |
3391c22e | 140 | #define elf_read_implies_exec(ex, executable_stack) (executable_stack != EXSTACK_DISABLE_X) |
1da177e4 LT |
141 | //#include <asm/ia32.h> |
142 | #include <linux/elf.h> | |
143 | ||
144 | typedef struct user_i387_ia32_struct elf_fpregset_t; | |
145 | typedef struct user32_fxsr_struct elf_fpxregset_t; | |
146 | ||
147 | ||
148 | static inline void elf_core_copy_regs(elf_gregset_t *elfregs, struct pt_regs *regs) | |
149 | { | |
150 | ELF_CORE_COPY_REGS((*elfregs), regs) | |
151 | } | |
152 | ||
153 | static inline int elf_core_copy_task_regs(struct task_struct *t, elf_gregset_t* elfregs) | |
154 | { | |
bb049232 | 155 | struct pt_regs *pp = task_pt_regs(t); |
1da177e4 LT |
156 | ELF_CORE_COPY_REGS((*elfregs), pp); |
157 | /* fix wrong segments */ | |
158 | (*elfregs)[7] = t->thread.ds; | |
159 | (*elfregs)[9] = t->thread.fsindex; | |
160 | (*elfregs)[10] = t->thread.gsindex; | |
161 | (*elfregs)[8] = t->thread.es; | |
162 | return 1; | |
163 | } | |
164 | ||
165 | static inline int | |
166 | elf_core_copy_task_fpregs(struct task_struct *tsk, struct pt_regs *regs, elf_fpregset_t *fpu) | |
167 | { | |
168 | struct _fpstate_ia32 *fpstate = (void*)fpu; | |
169 | mm_segment_t oldfs = get_fs(); | |
170 | ||
171 | if (!tsk_used_math(tsk)) | |
172 | return 0; | |
173 | if (!regs) | |
bb049232 | 174 | regs = task_pt_regs(tsk); |
1da177e4 LT |
175 | if (tsk == current) |
176 | unlazy_fpu(tsk); | |
177 | set_fs(KERNEL_DS); | |
178 | save_i387_ia32(tsk, fpstate, regs, 1); | |
179 | /* Correct for i386 bug. It puts the fop into the upper 16bits of | |
180 | the tag word (like FXSAVE), not into the fcs*/ | |
181 | fpstate->cssel |= fpstate->tag & 0xffff0000; | |
182 | set_fs(oldfs); | |
183 | return 1; | |
184 | } | |
185 | ||
186 | #define ELF_CORE_COPY_XFPREGS 1 | |
187 | static inline int | |
188 | elf_core_copy_task_xfpregs(struct task_struct *t, elf_fpxregset_t *xfpu) | |
189 | { | |
bb049232 | 190 | struct pt_regs *regs = task_pt_regs(t); |
1da177e4 LT |
191 | if (!tsk_used_math(t)) |
192 | return 0; | |
193 | if (t == current) | |
194 | unlazy_fpu(t); | |
195 | memcpy(xfpu, &t->thread.i387.fxsave, sizeof(elf_fpxregset_t)); | |
196 | xfpu->fcs = regs->cs; | |
197 | xfpu->fos = t->thread.ds; /* right? */ | |
198 | return 1; | |
199 | } | |
200 | ||
201 | #undef elf_check_arch | |
202 | #define elf_check_arch(x) \ | |
203 | ((x)->e_machine == EM_386) | |
204 | ||
205 | extern int force_personality32; | |
206 | ||
207 | #define ELF_EXEC_PAGESIZE PAGE_SIZE | |
208 | #define ELF_HWCAP (boot_cpu_data.x86_capability[0]) | |
209 | #define ELF_PLATFORM ("i686") | |
210 | #define SET_PERSONALITY(ex, ibcs2) \ | |
211 | do { \ | |
212 | unsigned long new_flags = 0; \ | |
213 | if ((ex).e_ident[EI_CLASS] == ELFCLASS32) \ | |
214 | new_flags = _TIF_IA32; \ | |
215 | if ((current_thread_info()->flags & _TIF_IA32) \ | |
216 | != new_flags) \ | |
217 | set_thread_flag(TIF_ABI_PENDING); \ | |
218 | else \ | |
219 | clear_thread_flag(TIF_ABI_PENDING); \ | |
220 | /* XXX This overwrites the user set personality */ \ | |
221 | current->personality |= force_personality32; \ | |
222 | } while (0) | |
223 | ||
224 | /* Override some function names */ | |
225 | #define elf_format elf32_format | |
226 | ||
227 | #define init_elf_binfmt init_elf32_binfmt | |
228 | #define exit_elf_binfmt exit_elf32_binfmt | |
229 | ||
230 | #define load_elf_binary load_elf32_binary | |
231 | ||
232 | #define ELF_PLAT_INIT(r, load_addr) elf32_init(r) | |
233 | #define setup_arg_pages(bprm, stack_top, exec_stack) \ | |
234 | ia32_setup_arg_pages(bprm, stack_top, exec_stack) | |
235 | int ia32_setup_arg_pages(struct linux_binprm *bprm, unsigned long stack_top, int executable_stack); | |
236 | ||
237 | #undef start_thread | |
238 | #define start_thread(regs,new_rip,new_rsp) do { \ | |
239 | asm volatile("movl %0,%%fs" :: "r" (0)); \ | |
240 | asm volatile("movl %0,%%es; movl %0,%%ds": :"r" (__USER32_DS)); \ | |
241 | load_gs_index(0); \ | |
242 | (regs)->rip = (new_rip); \ | |
243 | (regs)->rsp = (new_rsp); \ | |
244 | (regs)->eflags = 0x200; \ | |
245 | (regs)->cs = __USER32_CS; \ | |
246 | (regs)->ss = __USER32_DS; \ | |
247 | set_fs(USER_DS); \ | |
248 | } while(0) | |
249 | ||
250 | ||
1da177e4 LT |
251 | #include <linux/module.h> |
252 | ||
253 | MODULE_DESCRIPTION("Binary format loader for compatibility with IA32 ELF binaries."); | |
254 | MODULE_AUTHOR("Eric Youngdale, Andi Kleen"); | |
255 | ||
256 | #undef MODULE_DESCRIPTION | |
257 | #undef MODULE_AUTHOR | |
258 | ||
1da177e4 LT |
259 | static void elf32_init(struct pt_regs *); |
260 | ||
1e014410 AK |
261 | #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 |
262 | #define arch_setup_additional_pages syscall32_setup_pages | |
263 | extern int syscall32_setup_pages(struct linux_binprm *, int exstack); | |
264 | ||
1da177e4 LT |
265 | #include "../../../fs/binfmt_elf.c" |
266 | ||
267 | static void elf32_init(struct pt_regs *regs) | |
268 | { | |
269 | struct task_struct *me = current; | |
270 | regs->rdi = 0; | |
271 | regs->rsi = 0; | |
272 | regs->rdx = 0; | |
273 | regs->rcx = 0; | |
274 | regs->rax = 0; | |
275 | regs->rbx = 0; | |
276 | regs->rbp = 0; | |
277 | regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 = | |
278 | regs->r13 = regs->r14 = regs->r15 = 0; | |
279 | me->thread.fs = 0; | |
280 | me->thread.gs = 0; | |
281 | me->thread.fsindex = 0; | |
282 | me->thread.gsindex = 0; | |
283 | me->thread.ds = __USER_DS; | |
284 | me->thread.es = __USER_DS; | |
285 | } | |
286 | ||
ea0be473 AK |
287 | int ia32_setup_arg_pages(struct linux_binprm *bprm, unsigned long stack_top, |
288 | int executable_stack) | |
1da177e4 LT |
289 | { |
290 | unsigned long stack_base; | |
291 | struct vm_area_struct *mpnt; | |
292 | struct mm_struct *mm = current->mm; | |
293 | int i, ret; | |
294 | ||
6ae53cd4 | 295 | stack_base = stack_top - MAX_ARG_PAGES * PAGE_SIZE; |
1da177e4 LT |
296 | mm->arg_start = bprm->p + stack_base; |
297 | ||
298 | bprm->p += stack_base; | |
299 | if (bprm->loader) | |
300 | bprm->loader += stack_base; | |
301 | bprm->exec += stack_base; | |
302 | ||
c3762229 | 303 | mpnt = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL); |
1da177e4 LT |
304 | if (!mpnt) |
305 | return -ENOMEM; | |
1da177e4 | 306 | |
1da177e4 LT |
307 | down_write(&mm->mmap_sem); |
308 | { | |
309 | mpnt->vm_mm = mm; | |
310 | mpnt->vm_start = PAGE_MASK & (unsigned long) bprm->p; | |
6ae53cd4 | 311 | mpnt->vm_end = stack_top; |
1da177e4 LT |
312 | if (executable_stack == EXSTACK_ENABLE_X) |
313 | mpnt->vm_flags = VM_STACK_FLAGS | VM_EXEC; | |
314 | else if (executable_stack == EXSTACK_DISABLE_X) | |
315 | mpnt->vm_flags = VM_STACK_FLAGS & ~VM_EXEC; | |
316 | else | |
317 | mpnt->vm_flags = VM_STACK_FLAGS; | |
318 | mpnt->vm_page_prot = (mpnt->vm_flags & VM_EXEC) ? | |
319 | PAGE_COPY_EXEC : PAGE_COPY; | |
320 | if ((ret = insert_vm_struct(mm, mpnt))) { | |
321 | up_write(&mm->mmap_sem); | |
322 | kmem_cache_free(vm_area_cachep, mpnt); | |
323 | return ret; | |
324 | } | |
325 | mm->stack_vm = mm->total_vm = vma_pages(mpnt); | |
326 | } | |
327 | ||
328 | for (i = 0 ; i < MAX_ARG_PAGES ; i++) { | |
329 | struct page *page = bprm->page[i]; | |
330 | if (page) { | |
331 | bprm->page[i] = NULL; | |
332 | install_arg_page(mpnt, page, stack_base); | |
333 | } | |
334 | stack_base += PAGE_SIZE; | |
335 | } | |
336 | up_write(&mm->mmap_sem); | |
337 | ||
338 | return 0; | |
339 | } | |
ea0be473 | 340 | EXPORT_SYMBOL(ia32_setup_arg_pages); |
1da177e4 | 341 | |
1da177e4 LT |
342 | #ifdef CONFIG_SYSCTL |
343 | /* Register vsyscall32 into the ABI table */ | |
344 | #include <linux/sysctl.h> | |
345 | ||
346 | static ctl_table abi_table2[] = { | |
306421f3 EB |
347 | { |
348 | .ctl_name = 99, | |
349 | .procname = "vsyscall32", | |
350 | .data = &sysctl_vsyscall32, | |
351 | .maxlen = sizeof(int), | |
352 | .mode = 0644, | |
353 | .proc_handler = proc_dointvec | |
354 | }, | |
355 | {} | |
356 | }; | |
357 | ||
358 | static ctl_table abi_root_table2[] = { | |
359 | { | |
360 | .ctl_name = CTL_ABI, | |
361 | .procname = "abi", | |
362 | .mode = 0555, | |
363 | .child = abi_table2 | |
364 | }, | |
365 | {} | |
366 | }; | |
1da177e4 LT |
367 | |
368 | static __init int ia32_binfmt_init(void) | |
369 | { | |
0b4d4147 | 370 | register_sysctl_table(abi_root_table2); |
1da177e4 LT |
371 | return 0; |
372 | } | |
373 | __initcall(ia32_binfmt_init); | |
374 | #endif |