Commit | Line | Data |
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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 | */ | |
9f7290ed RB |
8 | #define __ASM_X86_64_ELF_H 1 |
9 | ||
10 | #undef ELF_CLASS | |
11 | #define ELF_CLASS ELFCLASS32 | |
12 | ||
1da177e4 | 13 | #include <linux/types.h> |
1da177e4 LT |
14 | #include <linux/stddef.h> |
15 | #include <linux/rwsem.h> | |
16 | #include <linux/sched.h> | |
17 | #include <linux/compat.h> | |
18 | #include <linux/string.h> | |
19 | #include <linux/binfmts.h> | |
20 | #include <linux/mm.h> | |
21 | #include <linux/security.h> | |
22 | ||
23 | #include <asm/segment.h> | |
24 | #include <asm/ptrace.h> | |
25 | #include <asm/processor.h> | |
26 | #include <asm/user32.h> | |
27 | #include <asm/sigcontext32.h> | |
28 | #include <asm/fpu32.h> | |
29 | #include <asm/i387.h> | |
30 | #include <asm/uaccess.h> | |
31 | #include <asm/ia32.h> | |
32 | #include <asm/vsyscall32.h> | |
33 | ||
34 | #define ELF_NAME "elf/i386" | |
35 | ||
36 | #define AT_SYSINFO 32 | |
37 | #define AT_SYSINFO_EHDR 33 | |
38 | ||
39 | int sysctl_vsyscall32 = 1; | |
40 | ||
41 | #define ARCH_DLINFO do { \ | |
42 | if (sysctl_vsyscall32) { \ | |
43 | NEW_AUX_ENT(AT_SYSINFO, (u32)(u64)VSYSCALL32_VSYSCALL); \ | |
44 | NEW_AUX_ENT(AT_SYSINFO_EHDR, VSYSCALL32_BASE); \ | |
45 | } \ | |
46 | } while(0) | |
47 | ||
48 | struct file; | |
49 | struct elf_phdr; | |
50 | ||
51 | #define IA32_EMULATOR 1 | |
52 | ||
84929801 | 53 | #define ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE + 0x1000000) |
1da177e4 LT |
54 | |
55 | #undef ELF_ARCH | |
56 | #define ELF_ARCH EM_386 | |
57 | ||
1da177e4 LT |
58 | #define ELF_DATA ELFDATA2LSB |
59 | ||
60 | #define USE_ELF_CORE_DUMP 1 | |
61 | ||
e6fc99c6 | 62 | /* Override elfcore.h */ |
1da177e4 LT |
63 | #define _LINUX_ELFCORE_H 1 |
64 | typedef unsigned int elf_greg_t; | |
65 | ||
66 | #define ELF_NGREG (sizeof (struct user_regs_struct32) / sizeof(elf_greg_t)) | |
67 | typedef elf_greg_t elf_gregset_t[ELF_NGREG]; | |
68 | ||
1da177e4 LT |
69 | struct elf_siginfo |
70 | { | |
71 | int si_signo; /* signal number */ | |
72 | int si_code; /* extra code */ | |
73 | int si_errno; /* errno */ | |
74 | }; | |
75 | ||
76 | #define jiffies_to_timeval(a,b) do { (b)->tv_usec = 0; (b)->tv_sec = (a)/HZ; }while(0) | |
77 | ||
78 | struct elf_prstatus | |
79 | { | |
80 | struct elf_siginfo pr_info; /* Info associated with signal */ | |
81 | short pr_cursig; /* Current signal */ | |
82 | unsigned int pr_sigpend; /* Set of pending signals */ | |
83 | unsigned int pr_sighold; /* Set of held signals */ | |
84 | pid_t pr_pid; | |
85 | pid_t pr_ppid; | |
86 | pid_t pr_pgrp; | |
87 | pid_t pr_sid; | |
88 | struct compat_timeval pr_utime; /* User time */ | |
89 | struct compat_timeval pr_stime; /* System time */ | |
90 | struct compat_timeval pr_cutime; /* Cumulative user time */ | |
91 | struct compat_timeval pr_cstime; /* Cumulative system time */ | |
92 | elf_gregset_t pr_reg; /* GP registers */ | |
93 | int pr_fpvalid; /* True if math co-processor being used. */ | |
94 | }; | |
95 | ||
96 | #define ELF_PRARGSZ (80) /* Number of chars for args */ | |
97 | ||
98 | struct elf_prpsinfo | |
99 | { | |
100 | char pr_state; /* numeric process state */ | |
101 | char pr_sname; /* char for pr_state */ | |
102 | char pr_zomb; /* zombie */ | |
103 | char pr_nice; /* nice val */ | |
104 | unsigned int pr_flag; /* flags */ | |
105 | __u16 pr_uid; | |
106 | __u16 pr_gid; | |
107 | pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid; | |
108 | /* Lots missing */ | |
109 | char pr_fname[16]; /* filename of executable */ | |
110 | char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */ | |
111 | }; | |
112 | ||
113 | #define __STR(x) #x | |
114 | #define STR(x) __STR(x) | |
115 | ||
116 | #define _GET_SEG(x) \ | |
117 | ({ __u32 seg; asm("movl %%" STR(x) ",%0" : "=r"(seg)); seg; }) | |
118 | ||
119 | /* Assumes current==process to be dumped */ | |
120 | #define ELF_CORE_COPY_REGS(pr_reg, regs) \ | |
121 | pr_reg[0] = regs->rbx; \ | |
122 | pr_reg[1] = regs->rcx; \ | |
123 | pr_reg[2] = regs->rdx; \ | |
124 | pr_reg[3] = regs->rsi; \ | |
125 | pr_reg[4] = regs->rdi; \ | |
126 | pr_reg[5] = regs->rbp; \ | |
127 | pr_reg[6] = regs->rax; \ | |
128 | pr_reg[7] = _GET_SEG(ds); \ | |
129 | pr_reg[8] = _GET_SEG(es); \ | |
130 | pr_reg[9] = _GET_SEG(fs); \ | |
131 | pr_reg[10] = _GET_SEG(gs); \ | |
132 | pr_reg[11] = regs->orig_rax; \ | |
133 | pr_reg[12] = regs->rip; \ | |
134 | pr_reg[13] = regs->cs; \ | |
135 | pr_reg[14] = regs->eflags; \ | |
136 | pr_reg[15] = regs->rsp; \ | |
137 | pr_reg[16] = regs->ss; | |
138 | ||
139 | #define user user32 | |
140 | ||
9f7290ed | 141 | #undef elf_read_implies_exec |
3391c22e | 142 | #define elf_read_implies_exec(ex, executable_stack) (executable_stack != EXSTACK_DISABLE_X) |
1da177e4 LT |
143 | //#include <asm/ia32.h> |
144 | #include <linux/elf.h> | |
145 | ||
146 | typedef struct user_i387_ia32_struct elf_fpregset_t; | |
147 | typedef struct user32_fxsr_struct elf_fpxregset_t; | |
148 | ||
149 | ||
150 | static inline void elf_core_copy_regs(elf_gregset_t *elfregs, struct pt_regs *regs) | |
151 | { | |
152 | ELF_CORE_COPY_REGS((*elfregs), regs) | |
153 | } | |
154 | ||
155 | static inline int elf_core_copy_task_regs(struct task_struct *t, elf_gregset_t* elfregs) | |
156 | { | |
bb049232 | 157 | struct pt_regs *pp = task_pt_regs(t); |
1da177e4 LT |
158 | ELF_CORE_COPY_REGS((*elfregs), pp); |
159 | /* fix wrong segments */ | |
160 | (*elfregs)[7] = t->thread.ds; | |
161 | (*elfregs)[9] = t->thread.fsindex; | |
162 | (*elfregs)[10] = t->thread.gsindex; | |
163 | (*elfregs)[8] = t->thread.es; | |
164 | return 1; | |
165 | } | |
166 | ||
167 | static inline int | |
168 | elf_core_copy_task_fpregs(struct task_struct *tsk, struct pt_regs *regs, elf_fpregset_t *fpu) | |
169 | { | |
170 | struct _fpstate_ia32 *fpstate = (void*)fpu; | |
171 | mm_segment_t oldfs = get_fs(); | |
172 | ||
173 | if (!tsk_used_math(tsk)) | |
174 | return 0; | |
175 | if (!regs) | |
bb049232 | 176 | regs = task_pt_regs(tsk); |
1da177e4 LT |
177 | if (tsk == current) |
178 | unlazy_fpu(tsk); | |
179 | set_fs(KERNEL_DS); | |
180 | save_i387_ia32(tsk, fpstate, regs, 1); | |
181 | /* Correct for i386 bug. It puts the fop into the upper 16bits of | |
182 | the tag word (like FXSAVE), not into the fcs*/ | |
183 | fpstate->cssel |= fpstate->tag & 0xffff0000; | |
184 | set_fs(oldfs); | |
185 | return 1; | |
186 | } | |
187 | ||
188 | #define ELF_CORE_COPY_XFPREGS 1 | |
189 | static inline int | |
190 | elf_core_copy_task_xfpregs(struct task_struct *t, elf_fpxregset_t *xfpu) | |
191 | { | |
bb049232 | 192 | struct pt_regs *regs = task_pt_regs(t); |
1da177e4 LT |
193 | if (!tsk_used_math(t)) |
194 | return 0; | |
195 | if (t == current) | |
196 | unlazy_fpu(t); | |
197 | memcpy(xfpu, &t->thread.i387.fxsave, sizeof(elf_fpxregset_t)); | |
198 | xfpu->fcs = regs->cs; | |
199 | xfpu->fos = t->thread.ds; /* right? */ | |
200 | return 1; | |
201 | } | |
202 | ||
203 | #undef elf_check_arch | |
204 | #define elf_check_arch(x) \ | |
205 | ((x)->e_machine == EM_386) | |
206 | ||
207 | extern int force_personality32; | |
208 | ||
209 | #define ELF_EXEC_PAGESIZE PAGE_SIZE | |
210 | #define ELF_HWCAP (boot_cpu_data.x86_capability[0]) | |
211 | #define ELF_PLATFORM ("i686") | |
212 | #define SET_PERSONALITY(ex, ibcs2) \ | |
213 | do { \ | |
214 | unsigned long new_flags = 0; \ | |
215 | if ((ex).e_ident[EI_CLASS] == ELFCLASS32) \ | |
216 | new_flags = _TIF_IA32; \ | |
217 | if ((current_thread_info()->flags & _TIF_IA32) \ | |
218 | != new_flags) \ | |
219 | set_thread_flag(TIF_ABI_PENDING); \ | |
220 | else \ | |
221 | clear_thread_flag(TIF_ABI_PENDING); \ | |
222 | /* XXX This overwrites the user set personality */ \ | |
223 | current->personality |= force_personality32; \ | |
224 | } while (0) | |
225 | ||
226 | /* Override some function names */ | |
227 | #define elf_format elf32_format | |
228 | ||
229 | #define init_elf_binfmt init_elf32_binfmt | |
230 | #define exit_elf_binfmt exit_elf32_binfmt | |
231 | ||
232 | #define load_elf_binary load_elf32_binary | |
233 | ||
234 | #define ELF_PLAT_INIT(r, load_addr) elf32_init(r) | |
1da177e4 LT |
235 | |
236 | #undef start_thread | |
237 | #define start_thread(regs,new_rip,new_rsp) do { \ | |
238 | asm volatile("movl %0,%%fs" :: "r" (0)); \ | |
239 | asm volatile("movl %0,%%es; movl %0,%%ds": :"r" (__USER32_DS)); \ | |
240 | load_gs_index(0); \ | |
241 | (regs)->rip = (new_rip); \ | |
242 | (regs)->rsp = (new_rsp); \ | |
243 | (regs)->eflags = 0x200; \ | |
244 | (regs)->cs = __USER32_CS; \ | |
245 | (regs)->ss = __USER32_DS; \ | |
246 | set_fs(USER_DS); \ | |
247 | } while(0) | |
248 | ||
249 | ||
1da177e4 LT |
250 | #include <linux/module.h> |
251 | ||
252 | MODULE_DESCRIPTION("Binary format loader for compatibility with IA32 ELF binaries."); | |
253 | MODULE_AUTHOR("Eric Youngdale, Andi Kleen"); | |
254 | ||
255 | #undef MODULE_DESCRIPTION | |
256 | #undef MODULE_AUTHOR | |
257 | ||
1da177e4 LT |
258 | static void elf32_init(struct pt_regs *); |
259 | ||
1e014410 AK |
260 | #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 |
261 | #define arch_setup_additional_pages syscall32_setup_pages | |
262 | extern int syscall32_setup_pages(struct linux_binprm *, int exstack); | |
263 | ||
1da177e4 LT |
264 | #include "../../../fs/binfmt_elf.c" |
265 | ||
266 | static void elf32_init(struct pt_regs *regs) | |
267 | { | |
268 | struct task_struct *me = current; | |
269 | regs->rdi = 0; | |
270 | regs->rsi = 0; | |
271 | regs->rdx = 0; | |
272 | regs->rcx = 0; | |
273 | regs->rax = 0; | |
274 | regs->rbx = 0; | |
275 | regs->rbp = 0; | |
276 | regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 = | |
277 | regs->r13 = regs->r14 = regs->r15 = 0; | |
278 | me->thread.fs = 0; | |
279 | me->thread.gs = 0; | |
280 | me->thread.fsindex = 0; | |
281 | me->thread.gsindex = 0; | |
282 | me->thread.ds = __USER_DS; | |
283 | me->thread.es = __USER_DS; | |
284 | } | |
285 | ||
1da177e4 LT |
286 | #ifdef CONFIG_SYSCTL |
287 | /* Register vsyscall32 into the ABI table */ | |
288 | #include <linux/sysctl.h> | |
289 | ||
290 | static ctl_table abi_table2[] = { | |
306421f3 EB |
291 | { |
292 | .ctl_name = 99, | |
293 | .procname = "vsyscall32", | |
294 | .data = &sysctl_vsyscall32, | |
295 | .maxlen = sizeof(int), | |
296 | .mode = 0644, | |
297 | .proc_handler = proc_dointvec | |
298 | }, | |
299 | {} | |
300 | }; | |
301 | ||
302 | static ctl_table abi_root_table2[] = { | |
303 | { | |
304 | .ctl_name = CTL_ABI, | |
305 | .procname = "abi", | |
306 | .mode = 0555, | |
307 | .child = abi_table2 | |
308 | }, | |
309 | {} | |
310 | }; | |
1da177e4 LT |
311 | |
312 | static __init int ia32_binfmt_init(void) | |
313 | { | |
0b4d4147 | 314 | register_sysctl_table(abi_root_table2); |
1da177e4 LT |
315 | return 0; |
316 | } | |
317 | __initcall(ia32_binfmt_init); | |
318 | #endif |