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-rw-r--r--arch/x86_64/ia32/ia32_binfmt.c434
1 files changed, 434 insertions, 0 deletions
diff --git a/arch/x86_64/ia32/ia32_binfmt.c b/arch/x86_64/ia32/ia32_binfmt.c
new file mode 100644
index 000000000000..93d568dfa762
--- /dev/null
+++ b/arch/x86_64/ia32/ia32_binfmt.c
@@ -0,0 +1,434 @@
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>
9#include <linux/config.h>
10#include <linux/stddef.h>
11#include <linux/rwsem.h>
12#include <linux/sched.h>
13#include <linux/compat.h>
14#include <linux/string.h>
15#include <linux/binfmts.h>
16#include <linux/mm.h>
17#include <linux/security.h>
18
19#include <asm/segment.h>
20#include <asm/ptrace.h>
21#include <asm/processor.h>
22#include <asm/user32.h>
23#include <asm/sigcontext32.h>
24#include <asm/fpu32.h>
25#include <asm/i387.h>
26#include <asm/uaccess.h>
27#include <asm/ia32.h>
28#include <asm/vsyscall32.h>
29
30#define ELF_NAME "elf/i386"
31
32#define AT_SYSINFO 32
33#define AT_SYSINFO_EHDR 33
34
35int sysctl_vsyscall32 = 1;
36
37#define ARCH_DLINFO do { \
38 if (sysctl_vsyscall32) { \
39 NEW_AUX_ENT(AT_SYSINFO, (u32)(u64)VSYSCALL32_VSYSCALL); \
40 NEW_AUX_ENT(AT_SYSINFO_EHDR, VSYSCALL32_BASE); \
41 } \
42} while(0)
43
44struct file;
45struct elf_phdr;
46
47#define IA32_EMULATOR 1
48
49#define ELF_ET_DYN_BASE (TASK_UNMAPPED_32 + 0x1000000)
50
51#undef ELF_ARCH
52#define ELF_ARCH EM_386
53
54#undef ELF_CLASS
55#define ELF_CLASS ELFCLASS32
56
57#define ELF_DATA ELFDATA2LSB
58
59#define USE_ELF_CORE_DUMP 1
60
61/* Overwrite elfcore.h */
62#define _LINUX_ELFCORE_H 1
63typedef unsigned int elf_greg_t;
64
65#define ELF_NGREG (sizeof (struct user_regs_struct32) / sizeof(elf_greg_t))
66typedef elf_greg_t elf_gregset_t[ELF_NGREG];
67
68/*
69 * These macros parameterize elf_core_dump in fs/binfmt_elf.c to write out
70 * extra segments containing the vsyscall DSO contents. Dumping its
71 * contents makes post-mortem fully interpretable later without matching up
72 * the same kernel and hardware config to see what PC values meant.
73 * Dumping its extra ELF program headers includes all the other information
74 * a debugger needs to easily find how the vsyscall DSO was being used.
75 */
76#define ELF_CORE_EXTRA_PHDRS (VSYSCALL32_EHDR->e_phnum)
77#define ELF_CORE_WRITE_EXTRA_PHDRS \
78do { \
79 const struct elf32_phdr *const vsyscall_phdrs = \
80 (const struct elf32_phdr *) (VSYSCALL32_BASE \
81 + VSYSCALL32_EHDR->e_phoff); \
82 int i; \
83 Elf32_Off ofs = 0; \
84 for (i = 0; i < VSYSCALL32_EHDR->e_phnum; ++i) { \
85 struct elf32_phdr phdr = vsyscall_phdrs[i]; \
86 if (phdr.p_type == PT_LOAD) { \
87 BUG_ON(ofs != 0); \
88 ofs = phdr.p_offset = offset; \
89 phdr.p_memsz = PAGE_ALIGN(phdr.p_memsz); \
90 phdr.p_filesz = phdr.p_memsz; \
91 offset += phdr.p_filesz; \
92 } \
93 else \
94 phdr.p_offset += ofs; \
95 phdr.p_paddr = 0; /* match other core phdrs */ \
96 DUMP_WRITE(&phdr, sizeof(phdr)); \
97 } \
98} while (0)
99#define ELF_CORE_WRITE_EXTRA_DATA \
100do { \
101 const struct elf32_phdr *const vsyscall_phdrs = \
102 (const struct elf32_phdr *) (VSYSCALL32_BASE \
103 + VSYSCALL32_EHDR->e_phoff); \
104 int i; \
105 for (i = 0; i < VSYSCALL32_EHDR->e_phnum; ++i) { \
106 if (vsyscall_phdrs[i].p_type == PT_LOAD) \
107 DUMP_WRITE((void *) (u64) vsyscall_phdrs[i].p_vaddr, \
108 PAGE_ALIGN(vsyscall_phdrs[i].p_memsz)); \
109 } \
110} while (0)
111
112struct elf_siginfo
113{
114 int si_signo; /* signal number */
115 int si_code; /* extra code */
116 int si_errno; /* errno */
117};
118
119#define jiffies_to_timeval(a,b) do { (b)->tv_usec = 0; (b)->tv_sec = (a)/HZ; }while(0)
120
121struct elf_prstatus
122{
123 struct elf_siginfo pr_info; /* Info associated with signal */
124 short pr_cursig; /* Current signal */
125 unsigned int pr_sigpend; /* Set of pending signals */
126 unsigned int pr_sighold; /* Set of held signals */
127 pid_t pr_pid;
128 pid_t pr_ppid;
129 pid_t pr_pgrp;
130 pid_t pr_sid;
131 struct compat_timeval pr_utime; /* User time */
132 struct compat_timeval pr_stime; /* System time */
133 struct compat_timeval pr_cutime; /* Cumulative user time */
134 struct compat_timeval pr_cstime; /* Cumulative system time */
135 elf_gregset_t pr_reg; /* GP registers */
136 int pr_fpvalid; /* True if math co-processor being used. */
137};
138
139#define ELF_PRARGSZ (80) /* Number of chars for args */
140
141struct elf_prpsinfo
142{
143 char pr_state; /* numeric process state */
144 char pr_sname; /* char for pr_state */
145 char pr_zomb; /* zombie */
146 char pr_nice; /* nice val */
147 unsigned int pr_flag; /* flags */
148 __u16 pr_uid;
149 __u16 pr_gid;
150 pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
151 /* Lots missing */
152 char pr_fname[16]; /* filename of executable */
153 char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
154};
155
156#define __STR(x) #x
157#define STR(x) __STR(x)
158
159#define _GET_SEG(x) \
160 ({ __u32 seg; asm("movl %%" STR(x) ",%0" : "=r"(seg)); seg; })
161
162/* Assumes current==process to be dumped */
163#define ELF_CORE_COPY_REGS(pr_reg, regs) \
164 pr_reg[0] = regs->rbx; \
165 pr_reg[1] = regs->rcx; \
166 pr_reg[2] = regs->rdx; \
167 pr_reg[3] = regs->rsi; \
168 pr_reg[4] = regs->rdi; \
169 pr_reg[5] = regs->rbp; \
170 pr_reg[6] = regs->rax; \
171 pr_reg[7] = _GET_SEG(ds); \
172 pr_reg[8] = _GET_SEG(es); \
173 pr_reg[9] = _GET_SEG(fs); \
174 pr_reg[10] = _GET_SEG(gs); \
175 pr_reg[11] = regs->orig_rax; \
176 pr_reg[12] = regs->rip; \
177 pr_reg[13] = regs->cs; \
178 pr_reg[14] = regs->eflags; \
179 pr_reg[15] = regs->rsp; \
180 pr_reg[16] = regs->ss;
181
182#define user user32
183
184#define __ASM_X86_64_ELF_H 1
185#define elf_read_implies_exec(ex, have_pt_gnu_stack) (!(have_pt_gnu_stack))
186//#include <asm/ia32.h>
187#include <linux/elf.h>
188
189typedef struct user_i387_ia32_struct elf_fpregset_t;
190typedef struct user32_fxsr_struct elf_fpxregset_t;
191
192
193static inline void elf_core_copy_regs(elf_gregset_t *elfregs, struct pt_regs *regs)
194{
195 ELF_CORE_COPY_REGS((*elfregs), regs)
196}
197
198static inline int elf_core_copy_task_regs(struct task_struct *t, elf_gregset_t* elfregs)
199{
200 struct pt_regs *pp = (struct pt_regs *)(t->thread.rsp0);
201 --pp;
202 ELF_CORE_COPY_REGS((*elfregs), pp);
203 /* fix wrong segments */
204 (*elfregs)[7] = t->thread.ds;
205 (*elfregs)[9] = t->thread.fsindex;
206 (*elfregs)[10] = t->thread.gsindex;
207 (*elfregs)[8] = t->thread.es;
208 return 1;
209}
210
211static inline int
212elf_core_copy_task_fpregs(struct task_struct *tsk, struct pt_regs *regs, elf_fpregset_t *fpu)
213{
214 struct _fpstate_ia32 *fpstate = (void*)fpu;
215 mm_segment_t oldfs = get_fs();
216
217 if (!tsk_used_math(tsk))
218 return 0;
219 if (!regs)
220 regs = (struct pt_regs *)tsk->thread.rsp0;
221 --regs;
222 if (tsk == current)
223 unlazy_fpu(tsk);
224 set_fs(KERNEL_DS);
225 save_i387_ia32(tsk, fpstate, regs, 1);
226 /* Correct for i386 bug. It puts the fop into the upper 16bits of
227 the tag word (like FXSAVE), not into the fcs*/
228 fpstate->cssel |= fpstate->tag & 0xffff0000;
229 set_fs(oldfs);
230 return 1;
231}
232
233#define ELF_CORE_COPY_XFPREGS 1
234static inline int
235elf_core_copy_task_xfpregs(struct task_struct *t, elf_fpxregset_t *xfpu)
236{
237 struct pt_regs *regs = ((struct pt_regs *)(t->thread.rsp0))-1;
238 if (!tsk_used_math(t))
239 return 0;
240 if (t == current)
241 unlazy_fpu(t);
242 memcpy(xfpu, &t->thread.i387.fxsave, sizeof(elf_fpxregset_t));
243 xfpu->fcs = regs->cs;
244 xfpu->fos = t->thread.ds; /* right? */
245 return 1;
246}
247
248#undef elf_check_arch
249#define elf_check_arch(x) \
250 ((x)->e_machine == EM_386)
251
252extern int force_personality32;
253
254#define ELF_EXEC_PAGESIZE PAGE_SIZE
255#define ELF_HWCAP (boot_cpu_data.x86_capability[0])
256#define ELF_PLATFORM ("i686")
257#define SET_PERSONALITY(ex, ibcs2) \
258do { \
259 unsigned long new_flags = 0; \
260 if ((ex).e_ident[EI_CLASS] == ELFCLASS32) \
261 new_flags = _TIF_IA32; \
262 if ((current_thread_info()->flags & _TIF_IA32) \
263 != new_flags) \
264 set_thread_flag(TIF_ABI_PENDING); \
265 else \
266 clear_thread_flag(TIF_ABI_PENDING); \
267 /* XXX This overwrites the user set personality */ \
268 current->personality |= force_personality32; \
269} while (0)
270
271/* Override some function names */
272#define elf_format elf32_format
273
274#define init_elf_binfmt init_elf32_binfmt
275#define exit_elf_binfmt exit_elf32_binfmt
276
277#define load_elf_binary load_elf32_binary
278
279#define ELF_PLAT_INIT(r, load_addr) elf32_init(r)
280#define setup_arg_pages(bprm, stack_top, exec_stack) \
281 ia32_setup_arg_pages(bprm, stack_top, exec_stack)
282int ia32_setup_arg_pages(struct linux_binprm *bprm, unsigned long stack_top, int executable_stack);
283
284#undef start_thread
285#define start_thread(regs,new_rip,new_rsp) do { \
286 asm volatile("movl %0,%%fs" :: "r" (0)); \
287 asm volatile("movl %0,%%es; movl %0,%%ds": :"r" (__USER32_DS)); \
288 load_gs_index(0); \
289 (regs)->rip = (new_rip); \
290 (regs)->rsp = (new_rsp); \
291 (regs)->eflags = 0x200; \
292 (regs)->cs = __USER32_CS; \
293 (regs)->ss = __USER32_DS; \
294 set_fs(USER_DS); \
295} while(0)
296
297
298#define elf_map elf32_map
299
300#include <linux/module.h>
301
302MODULE_DESCRIPTION("Binary format loader for compatibility with IA32 ELF binaries.");
303MODULE_AUTHOR("Eric Youngdale, Andi Kleen");
304
305#undef MODULE_DESCRIPTION
306#undef MODULE_AUTHOR
307
308#define elf_addr_t __u32
309
310#undef TASK_SIZE
311#define TASK_SIZE 0xffffffff
312
313static void elf32_init(struct pt_regs *);
314
315#include "../../../fs/binfmt_elf.c"
316
317static void elf32_init(struct pt_regs *regs)
318{
319 struct task_struct *me = current;
320 regs->rdi = 0;
321 regs->rsi = 0;
322 regs->rdx = 0;
323 regs->rcx = 0;
324 regs->rax = 0;
325 regs->rbx = 0;
326 regs->rbp = 0;
327 regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
328 regs->r13 = regs->r14 = regs->r15 = 0;
329 me->thread.fs = 0;
330 me->thread.gs = 0;
331 me->thread.fsindex = 0;
332 me->thread.gsindex = 0;
333 me->thread.ds = __USER_DS;
334 me->thread.es = __USER_DS;
335}
336
337int setup_arg_pages(struct linux_binprm *bprm, unsigned long stack_top, int executable_stack)
338{
339 unsigned long stack_base;
340 struct vm_area_struct *mpnt;
341 struct mm_struct *mm = current->mm;
342 int i, ret;
343
344 stack_base = IA32_STACK_TOP - MAX_ARG_PAGES * PAGE_SIZE;
345 mm->arg_start = bprm->p + stack_base;
346
347 bprm->p += stack_base;
348 if (bprm->loader)
349 bprm->loader += stack_base;
350 bprm->exec += stack_base;
351
352 mpnt = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
353 if (!mpnt)
354 return -ENOMEM;
355
356 if (security_vm_enough_memory((IA32_STACK_TOP - (PAGE_MASK & (unsigned long) bprm->p))>>PAGE_SHIFT)) {
357 kmem_cache_free(vm_area_cachep, mpnt);
358 return -ENOMEM;
359 }
360
361 memset(mpnt, 0, sizeof(*mpnt));
362
363 down_write(&mm->mmap_sem);
364 {
365 mpnt->vm_mm = mm;
366 mpnt->vm_start = PAGE_MASK & (unsigned long) bprm->p;
367 mpnt->vm_end = IA32_STACK_TOP;
368 if (executable_stack == EXSTACK_ENABLE_X)
369 mpnt->vm_flags = VM_STACK_FLAGS | VM_EXEC;
370 else if (executable_stack == EXSTACK_DISABLE_X)
371 mpnt->vm_flags = VM_STACK_FLAGS & ~VM_EXEC;
372 else
373 mpnt->vm_flags = VM_STACK_FLAGS;
374 mpnt->vm_page_prot = (mpnt->vm_flags & VM_EXEC) ?
375 PAGE_COPY_EXEC : PAGE_COPY;
376 if ((ret = insert_vm_struct(mm, mpnt))) {
377 up_write(&mm->mmap_sem);
378 kmem_cache_free(vm_area_cachep, mpnt);
379 return ret;
380 }
381 mm->stack_vm = mm->total_vm = vma_pages(mpnt);
382 }
383
384 for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
385 struct page *page = bprm->page[i];
386 if (page) {
387 bprm->page[i] = NULL;
388 install_arg_page(mpnt, page, stack_base);
389 }
390 stack_base += PAGE_SIZE;
391 }
392 up_write(&mm->mmap_sem);
393
394 return 0;
395}
396
397static unsigned long
398elf32_map (struct file *filep, unsigned long addr, struct elf_phdr *eppnt, int prot, int type)
399{
400 unsigned long map_addr;
401 struct task_struct *me = current;
402
403 down_write(&me->mm->mmap_sem);
404 map_addr = do_mmap(filep, ELF_PAGESTART(addr),
405 eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr), prot,
406 type,
407 eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr));
408 up_write(&me->mm->mmap_sem);
409 return(map_addr);
410}
411
412#ifdef CONFIG_SYSCTL
413/* Register vsyscall32 into the ABI table */
414#include <linux/sysctl.h>
415
416static ctl_table abi_table2[] = {
417 { 99, "vsyscall32", &sysctl_vsyscall32, sizeof(int), 0644, NULL,
418 proc_dointvec },
419 { 0, }
420};
421
422static ctl_table abi_root_table2[] = {
423 { .ctl_name = CTL_ABI, .procname = "abi", .mode = 0555,
424 .child = abi_table2 },
425 { 0 },
426};
427
428static __init int ia32_binfmt_init(void)
429{
430 register_sysctl_table(abi_root_table2, 1);
431 return 0;
432}
433__initcall(ia32_binfmt_init);
434#endif
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