aboutsummaryrefslogtreecommitdiffstats
path: root/arch/x86/ia32/ia32_binfmt.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/ia32/ia32_binfmt.c')
-rw-r--r--arch/x86/ia32/ia32_binfmt.c320
1 files changed, 320 insertions, 0 deletions
diff --git a/arch/x86/ia32/ia32_binfmt.c b/arch/x86/ia32/ia32_binfmt.c
new file mode 100644
index 000000000000..dffd2ac72747
--- /dev/null
+++ b/arch/x86/ia32/ia32_binfmt.c
@@ -0,0 +1,320 @@
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#define __ASM_X86_64_ELF_H 1
9
10#undef ELF_CLASS
11#define ELF_CLASS ELFCLASS32
12
13#include <linux/types.h>
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
39int sysctl_vsyscall32 = 1;
40
41#undef ARCH_DLINFO
42#define ARCH_DLINFO do { \
43 if (sysctl_vsyscall32) { \
44 current->mm->context.vdso = (void *)VSYSCALL32_BASE; \
45 NEW_AUX_ENT(AT_SYSINFO, (u32)(u64)VSYSCALL32_VSYSCALL); \
46 NEW_AUX_ENT(AT_SYSINFO_EHDR, VSYSCALL32_BASE); \
47 } \
48} while(0)
49
50struct file;
51struct elf_phdr;
52
53#define IA32_EMULATOR 1
54
55#define ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE + 0x1000000)
56
57#undef ELF_ARCH
58#define ELF_ARCH EM_386
59
60#define ELF_DATA ELFDATA2LSB
61
62#define USE_ELF_CORE_DUMP 1
63
64/* Override elfcore.h */
65#define _LINUX_ELFCORE_H 1
66typedef unsigned int elf_greg_t;
67
68#define ELF_NGREG (sizeof (struct user_regs_struct32) / sizeof(elf_greg_t))
69typedef elf_greg_t elf_gregset_t[ELF_NGREG];
70
71struct elf_siginfo
72{
73 int si_signo; /* signal number */
74 int si_code; /* extra code */
75 int si_errno; /* errno */
76};
77
78#define jiffies_to_timeval(a,b) do { (b)->tv_usec = 0; (b)->tv_sec = (a)/HZ; }while(0)
79
80struct elf_prstatus
81{
82 struct elf_siginfo pr_info; /* Info associated with signal */
83 short pr_cursig; /* Current signal */
84 unsigned int pr_sigpend; /* Set of pending signals */
85 unsigned int pr_sighold; /* Set of held signals */
86 pid_t pr_pid;
87 pid_t pr_ppid;
88 pid_t pr_pgrp;
89 pid_t pr_sid;
90 struct compat_timeval pr_utime; /* User time */
91 struct compat_timeval pr_stime; /* System time */
92 struct compat_timeval pr_cutime; /* Cumulative user time */
93 struct compat_timeval pr_cstime; /* Cumulative system time */
94 elf_gregset_t pr_reg; /* GP registers */
95 int pr_fpvalid; /* True if math co-processor being used. */
96};
97
98#define ELF_PRARGSZ (80) /* Number of chars for args */
99
100struct elf_prpsinfo
101{
102 char pr_state; /* numeric process state */
103 char pr_sname; /* char for pr_state */
104 char pr_zomb; /* zombie */
105 char pr_nice; /* nice val */
106 unsigned int pr_flag; /* flags */
107 __u16 pr_uid;
108 __u16 pr_gid;
109 pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
110 /* Lots missing */
111 char pr_fname[16]; /* filename of executable */
112 char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
113};
114
115#define __STR(x) #x
116#define STR(x) __STR(x)
117
118#define _GET_SEG(x) \
119 ({ __u32 seg; asm("movl %%" STR(x) ",%0" : "=r"(seg)); seg; })
120
121/* Assumes current==process to be dumped */
122#define ELF_CORE_COPY_REGS(pr_reg, regs) \
123 pr_reg[0] = regs->rbx; \
124 pr_reg[1] = regs->rcx; \
125 pr_reg[2] = regs->rdx; \
126 pr_reg[3] = regs->rsi; \
127 pr_reg[4] = regs->rdi; \
128 pr_reg[5] = regs->rbp; \
129 pr_reg[6] = regs->rax; \
130 pr_reg[7] = _GET_SEG(ds); \
131 pr_reg[8] = _GET_SEG(es); \
132 pr_reg[9] = _GET_SEG(fs); \
133 pr_reg[10] = _GET_SEG(gs); \
134 pr_reg[11] = regs->orig_rax; \
135 pr_reg[12] = regs->rip; \
136 pr_reg[13] = regs->cs; \
137 pr_reg[14] = regs->eflags; \
138 pr_reg[15] = regs->rsp; \
139 pr_reg[16] = regs->ss;
140
141#define user user32
142
143#undef elf_read_implies_exec
144#define elf_read_implies_exec(ex, executable_stack) (executable_stack != EXSTACK_DISABLE_X)
145//#include <asm/ia32.h>
146#include <linux/elf.h>
147
148typedef struct user_i387_ia32_struct elf_fpregset_t;
149typedef struct user32_fxsr_struct elf_fpxregset_t;
150
151
152static inline void elf_core_copy_regs(elf_gregset_t *elfregs, struct pt_regs *regs)
153{
154 ELF_CORE_COPY_REGS((*elfregs), regs)
155}
156
157static inline int elf_core_copy_task_regs(struct task_struct *t, elf_gregset_t* elfregs)
158{
159 struct pt_regs *pp = task_pt_regs(t);
160 ELF_CORE_COPY_REGS((*elfregs), pp);
161 /* fix wrong segments */
162 (*elfregs)[7] = t->thread.ds;
163 (*elfregs)[9] = t->thread.fsindex;
164 (*elfregs)[10] = t->thread.gsindex;
165 (*elfregs)[8] = t->thread.es;
166 return 1;
167}
168
169static inline int
170elf_core_copy_task_fpregs(struct task_struct *tsk, struct pt_regs *regs, elf_fpregset_t *fpu)
171{
172 struct _fpstate_ia32 *fpstate = (void*)fpu;
173 mm_segment_t oldfs = get_fs();
174
175 if (!tsk_used_math(tsk))
176 return 0;
177 if (!regs)
178 regs = task_pt_regs(tsk);
179 if (tsk == current)
180 unlazy_fpu(tsk);
181 set_fs(KERNEL_DS);
182 save_i387_ia32(tsk, fpstate, regs, 1);
183 /* Correct for i386 bug. It puts the fop into the upper 16bits of
184 the tag word (like FXSAVE), not into the fcs*/
185 fpstate->cssel |= fpstate->tag & 0xffff0000;
186 set_fs(oldfs);
187 return 1;
188}
189
190#define ELF_CORE_COPY_XFPREGS 1
191static inline int
192elf_core_copy_task_xfpregs(struct task_struct *t, elf_fpxregset_t *xfpu)
193{
194 struct pt_regs *regs = task_pt_regs(t);
195 if (!tsk_used_math(t))
196 return 0;
197 if (t == current)
198 unlazy_fpu(t);
199 memcpy(xfpu, &t->thread.i387.fxsave, sizeof(elf_fpxregset_t));
200 xfpu->fcs = regs->cs;
201 xfpu->fos = t->thread.ds; /* right? */
202 return 1;
203}
204
205#undef elf_check_arch
206#define elf_check_arch(x) \
207 ((x)->e_machine == EM_386)
208
209extern int force_personality32;
210
211#define ELF_EXEC_PAGESIZE PAGE_SIZE
212#define ELF_HWCAP (boot_cpu_data.x86_capability[0])
213#define ELF_PLATFORM ("i686")
214#define SET_PERSONALITY(ex, ibcs2) \
215do { \
216 unsigned long new_flags = 0; \
217 if ((ex).e_ident[EI_CLASS] == ELFCLASS32) \
218 new_flags = _TIF_IA32; \
219 if ((current_thread_info()->flags & _TIF_IA32) \
220 != new_flags) \
221 set_thread_flag(TIF_ABI_PENDING); \
222 else \
223 clear_thread_flag(TIF_ABI_PENDING); \
224 /* XXX This overwrites the user set personality */ \
225 current->personality |= force_personality32; \
226} while (0)
227
228/* Override some function names */
229#define elf_format elf32_format
230
231#define init_elf_binfmt init_elf32_binfmt
232#define exit_elf_binfmt exit_elf32_binfmt
233
234#define load_elf_binary load_elf32_binary
235
236#define ELF_PLAT_INIT(r, load_addr) elf32_init(r)
237
238#undef start_thread
239#define start_thread(regs,new_rip,new_rsp) do { \
240 asm volatile("movl %0,%%fs" :: "r" (0)); \
241 asm volatile("movl %0,%%es; movl %0,%%ds": :"r" (__USER32_DS)); \
242 load_gs_index(0); \
243 (regs)->rip = (new_rip); \
244 (regs)->rsp = (new_rsp); \
245 (regs)->eflags = 0x200; \
246 (regs)->cs = __USER32_CS; \
247 (regs)->ss = __USER32_DS; \
248 set_fs(USER_DS); \
249} while(0)
250
251
252#include <linux/module.h>
253
254MODULE_DESCRIPTION("Binary format loader for compatibility with IA32 ELF binaries.");
255MODULE_AUTHOR("Eric Youngdale, Andi Kleen");
256
257#undef MODULE_DESCRIPTION
258#undef MODULE_AUTHOR
259
260static void elf32_init(struct pt_regs *);
261
262#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
263#define arch_setup_additional_pages syscall32_setup_pages
264extern int syscall32_setup_pages(struct linux_binprm *, int exstack);
265
266#include "../../../fs/binfmt_elf.c"
267
268static void elf32_init(struct pt_regs *regs)
269{
270 struct task_struct *me = current;
271 regs->rdi = 0;
272 regs->rsi = 0;
273 regs->rdx = 0;
274 regs->rcx = 0;
275 regs->rax = 0;
276 regs->rbx = 0;
277 regs->rbp = 0;
278 regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
279 regs->r13 = regs->r14 = regs->r15 = 0;
280 me->thread.fs = 0;
281 me->thread.gs = 0;
282 me->thread.fsindex = 0;
283 me->thread.gsindex = 0;
284 me->thread.ds = __USER_DS;
285 me->thread.es = __USER_DS;
286}
287
288#ifdef CONFIG_SYSCTL
289/* Register vsyscall32 into the ABI table */
290#include <linux/sysctl.h>
291
292static ctl_table abi_table2[] = {
293 {
294 .ctl_name = 99,
295 .procname = "vsyscall32",
296 .data = &sysctl_vsyscall32,
297 .maxlen = sizeof(int),
298 .mode = 0644,
299 .proc_handler = proc_dointvec
300 },
301 {}
302};
303
304static ctl_table abi_root_table2[] = {
305 {
306 .ctl_name = CTL_ABI,
307 .procname = "abi",
308 .mode = 0555,
309 .child = abi_table2
310 },
311 {}
312};
313
314static __init int ia32_binfmt_init(void)
315{
316 register_sysctl_table(abi_root_table2);
317 return 0;
318}
319__initcall(ia32_binfmt_init);
320#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-15 07:19:59 -0500