2 * Written 2000,2002 by Andi Kleen.
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.
8 #include <linux/types.h>
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>
16 #include <linux/security.h>
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>
25 #include <asm/uaccess.h>
27 #include <asm/vsyscall32.h>
29 #define ELF_NAME "elf/i386"
32 #define AT_SYSINFO_EHDR 33
34 int sysctl_vsyscall32
= 1;
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); \
46 #define IA32_EMULATOR 1
48 #define ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE + 0x1000000)
51 #define ELF_ARCH EM_386
54 #define ELF_CLASS ELFCLASS32
56 #define ELF_DATA ELFDATA2LSB
58 #define USE_ELF_CORE_DUMP 1
60 /* Override elfcore.h */
61 #define _LINUX_ELFCORE_H 1
62 typedef unsigned int elf_greg_t
;
64 #define ELF_NGREG (sizeof (struct user_regs_struct32) / sizeof(elf_greg_t))
65 typedef elf_greg_t elf_gregset_t
[ELF_NGREG
];
69 int si_signo
; /* signal number */
70 int si_code
; /* extra code */
71 int si_errno
; /* errno */
74 #define jiffies_to_timeval(a,b) do { (b)->tv_usec = 0; (b)->tv_sec = (a)/HZ; }while(0)
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 */
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. */
94 #define ELF_PRARGSZ (80) /* Number of chars for args */
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 */
105 pid_t pr_pid
, pr_ppid
, pr_pgrp
, pr_sid
;
107 char pr_fname
[16]; /* filename of executable */
108 char pr_psargs
[ELF_PRARGSZ
]; /* initial part of arg list */
112 #define STR(x) __STR(x)
114 #define _GET_SEG(x) \
115 ({ __u32 seg; asm("movl %%" STR(x) ",%0" : "=r"(seg)); seg; })
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;
139 #define __ASM_X86_64_ELF_H 1
140 #define elf_read_implies_exec(ex, executable_stack) (executable_stack != EXSTACK_DISABLE_X)
141 //#include <asm/ia32.h>
142 #include <linux/elf.h>
144 typedef struct user_i387_ia32_struct elf_fpregset_t
;
145 typedef struct user32_fxsr_struct elf_fpxregset_t
;
148 static inline void elf_core_copy_regs(elf_gregset_t
*elfregs
, struct pt_regs
*regs
)
150 ELF_CORE_COPY_REGS((*elfregs
), regs
)
153 static inline int elf_core_copy_task_regs(struct task_struct
*t
, elf_gregset_t
* elfregs
)
155 struct pt_regs
*pp
= task_pt_regs(t
);
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
;
166 elf_core_copy_task_fpregs(struct task_struct
*tsk
, struct pt_regs
*regs
, elf_fpregset_t
*fpu
)
168 struct _fpstate_ia32
*fpstate
= (void*)fpu
;
169 mm_segment_t oldfs
= get_fs();
171 if (!tsk_used_math(tsk
))
174 regs
= task_pt_regs(tsk
);
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;
186 #define ELF_CORE_COPY_XFPREGS 1
188 elf_core_copy_task_xfpregs(struct task_struct
*t
, elf_fpxregset_t
*xfpu
)
190 struct pt_regs
*regs
= task_pt_regs(t
);
191 if (!tsk_used_math(t
))
195 memcpy(xfpu
, &t
->thread
.i387
.fxsave
, sizeof(elf_fpxregset_t
));
196 xfpu
->fcs
= regs
->cs
;
197 xfpu
->fos
= t
->thread
.ds
; /* right? */
201 #undef elf_check_arch
202 #define elf_check_arch(x) \
203 ((x)->e_machine == EM_386)
205 extern int force_personality32
;
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) \
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) \
217 set_thread_flag(TIF_ABI_PENDING); \
219 clear_thread_flag(TIF_ABI_PENDING); \
220 /* XXX This overwrites the user set personality */ \
221 current->personality |= force_personality32; \
224 /* Override some function names */
225 #define elf_format elf32_format
227 #define init_elf_binfmt init_elf32_binfmt
228 #define exit_elf_binfmt exit_elf32_binfmt
230 #define load_elf_binary load_elf32_binary
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
);
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)); \
242 (regs)->rip = (new_rip); \
243 (regs)->rsp = (new_rsp); \
244 (regs)->eflags = 0x200; \
245 (regs)->cs = __USER32_CS; \
246 (regs)->ss = __USER32_DS; \
251 #include <linux/module.h>
253 MODULE_DESCRIPTION("Binary format loader for compatibility with IA32 ELF binaries.");
254 MODULE_AUTHOR("Eric Youngdale, Andi Kleen");
256 #undef MODULE_DESCRIPTION
259 static void elf32_init(struct pt_regs
*);
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
);
265 #include "../../../fs/binfmt_elf.c"
267 static void elf32_init(struct pt_regs
*regs
)
269 struct task_struct
*me
= current
;
277 regs
->r8
= regs
->r9
= regs
->r10
= regs
->r11
= regs
->r12
=
278 regs
->r13
= regs
->r14
= regs
->r15
= 0;
281 me
->thread
.fsindex
= 0;
282 me
->thread
.gsindex
= 0;
283 me
->thread
.ds
= __USER_DS
;
284 me
->thread
.es
= __USER_DS
;
287 int ia32_setup_arg_pages(struct linux_binprm
*bprm
, unsigned long stack_top
,
288 int executable_stack
)
290 unsigned long stack_base
;
291 struct vm_area_struct
*mpnt
;
292 struct mm_struct
*mm
= current
->mm
;
295 stack_base
= stack_top
- MAX_ARG_PAGES
* PAGE_SIZE
;
296 mm
->arg_start
= bprm
->p
+ stack_base
;
298 bprm
->p
+= stack_base
;
300 bprm
->loader
+= stack_base
;
301 bprm
->exec
+= stack_base
;
303 mpnt
= kmem_cache_zalloc(vm_area_cachep
, GFP_KERNEL
);
307 down_write(&mm
->mmap_sem
);
310 mpnt
->vm_start
= PAGE_MASK
& (unsigned long) bprm
->p
;
311 mpnt
->vm_end
= stack_top
;
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
;
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
);
325 mm
->stack_vm
= mm
->total_vm
= vma_pages(mpnt
);
328 for (i
= 0 ; i
< MAX_ARG_PAGES
; i
++) {
329 struct page
*page
= bprm
->page
[i
];
331 bprm
->page
[i
] = NULL
;
332 install_arg_page(mpnt
, page
, stack_base
);
334 stack_base
+= PAGE_SIZE
;
336 up_write(&mm
->mmap_sem
);
340 EXPORT_SYMBOL(ia32_setup_arg_pages
);
343 /* Register vsyscall32 into the ABI table */
344 #include <linux/sysctl.h>
346 static ctl_table abi_table2
[] = {
347 { 99, "vsyscall32", &sysctl_vsyscall32
, sizeof(int), 0644, NULL
,
352 static ctl_table abi_root_table2
[] = {
353 { .ctl_name
= CTL_ABI
, .procname
= "abi", .mode
= 0555,
354 .child
= abi_table2
},
358 static __init
int ia32_binfmt_init(void)
360 register_sysctl_table(abi_root_table2
, 0);
363 __initcall(ia32_binfmt_init
);