Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/x86_64/ia32/ia32_signal.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * | |
6 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson | |
7 | * 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes | |
8 | * 2000-12-* x86-64 compatibility mode signal handling by Andi Kleen | |
1da177e4 LT |
9 | */ |
10 | ||
11 | #include <linux/sched.h> | |
12 | #include <linux/mm.h> | |
13 | #include <linux/smp.h> | |
1da177e4 LT |
14 | #include <linux/kernel.h> |
15 | #include <linux/signal.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/wait.h> | |
18 | #include <linux/ptrace.h> | |
19 | #include <linux/unistd.h> | |
20 | #include <linux/stddef.h> | |
21 | #include <linux/personality.h> | |
22 | #include <linux/compat.h> | |
9fbbd4dd | 23 | #include <linux/binfmts.h> |
1da177e4 LT |
24 | #include <asm/ucontext.h> |
25 | #include <asm/uaccess.h> | |
26 | #include <asm/i387.h> | |
27 | #include <asm/ia32.h> | |
28 | #include <asm/ptrace.h> | |
29 | #include <asm/ia32_unistd.h> | |
30 | #include <asm/user32.h> | |
31 | #include <asm/sigcontext32.h> | |
1da177e4 | 32 | #include <asm/proto.h> |
af65d648 | 33 | #include <asm/vdso.h> |
1da177e4 LT |
34 | |
35 | #define DEBUG_SIG 0 | |
36 | ||
37 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
38 | ||
39 | asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset); | |
40 | void signal_fault(struct pt_regs *regs, void __user *frame, char *where); | |
41 | ||
42 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) | |
43 | { | |
44 | int err; | |
99b9cdf7 TG |
45 | |
46 | if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t))) | |
1da177e4 LT |
47 | return -EFAULT; |
48 | ||
49 | /* If you change siginfo_t structure, please make sure that | |
50 | this code is fixed accordingly. | |
51 | It should never copy any pad contained in the structure | |
52 | to avoid security leaks, but must copy the generic | |
53 | 3 ints plus the relevant union member. */ | |
54 | err = __put_user(from->si_signo, &to->si_signo); | |
55 | err |= __put_user(from->si_errno, &to->si_errno); | |
99b9cdf7 | 56 | err |= __put_user((short)from->si_code, &to->si_code); |
1da177e4 LT |
57 | |
58 | if (from->si_code < 0) { | |
59 | err |= __put_user(from->si_pid, &to->si_pid); | |
99b9cdf7 TG |
60 | err |= __put_user(from->si_uid, &to->si_uid); |
61 | err |= __put_user(ptr_to_compat(from->si_ptr), &to->si_ptr); | |
1da177e4 | 62 | } else { |
99b9cdf7 TG |
63 | /* |
64 | * First 32bits of unions are always present: | |
65 | * si_pid === si_band === si_tid === si_addr(LS half) | |
66 | */ | |
67 | err |= __put_user(from->_sifields._pad[0], | |
68 | &to->_sifields._pad[0]); | |
1da177e4 LT |
69 | switch (from->si_code >> 16) { |
70 | case __SI_FAULT >> 16: | |
71 | break; | |
72 | case __SI_CHLD >> 16: | |
73 | err |= __put_user(from->si_utime, &to->si_utime); | |
74 | err |= __put_user(from->si_stime, &to->si_stime); | |
75 | err |= __put_user(from->si_status, &to->si_status); | |
76 | /* FALL THROUGH */ | |
77 | default: | |
78 | case __SI_KILL >> 16: | |
79 | err |= __put_user(from->si_uid, &to->si_uid); | |
80 | break; | |
81 | case __SI_POLL >> 16: | |
99b9cdf7 | 82 | err |= __put_user(from->si_fd, &to->si_fd); |
1da177e4 LT |
83 | break; |
84 | case __SI_TIMER >> 16: | |
99b9cdf7 | 85 | err |= __put_user(from->si_overrun, &to->si_overrun); |
1da177e4 | 86 | err |= __put_user(ptr_to_compat(from->si_ptr), |
99b9cdf7 | 87 | &to->si_ptr); |
1da177e4 | 88 | break; |
99b9cdf7 TG |
89 | /* This is not generated by the kernel as of now. */ |
90 | case __SI_RT >> 16: | |
1da177e4 LT |
91 | case __SI_MESGQ >> 16: |
92 | err |= __put_user(from->si_uid, &to->si_uid); | |
93 | err |= __put_user(from->si_int, &to->si_int); | |
94 | break; | |
95 | } | |
96 | } | |
97 | return err; | |
98 | } | |
99 | ||
100 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) | |
101 | { | |
102 | int err; | |
103 | u32 ptr32; | |
99b9cdf7 TG |
104 | |
105 | if (!access_ok(VERIFY_READ, from, sizeof(compat_siginfo_t))) | |
1da177e4 LT |
106 | return -EFAULT; |
107 | ||
108 | err = __get_user(to->si_signo, &from->si_signo); | |
109 | err |= __get_user(to->si_errno, &from->si_errno); | |
110 | err |= __get_user(to->si_code, &from->si_code); | |
111 | ||
112 | err |= __get_user(to->si_pid, &from->si_pid); | |
113 | err |= __get_user(to->si_uid, &from->si_uid); | |
114 | err |= __get_user(ptr32, &from->si_ptr); | |
115 | to->si_ptr = compat_ptr(ptr32); | |
116 | ||
117 | return err; | |
118 | } | |
119 | ||
99b9cdf7 | 120 | asmlinkage long sys32_sigsuspend(int history0, int history1, old_sigset_t mask) |
1da177e4 | 121 | { |
1da177e4 LT |
122 | mask &= _BLOCKABLE; |
123 | spin_lock_irq(¤t->sighand->siglock); | |
1d001df1 | 124 | current->saved_sigmask = current->blocked; |
1da177e4 LT |
125 | siginitset(¤t->blocked, mask); |
126 | recalc_sigpending(); | |
127 | spin_unlock_irq(¤t->sighand->siglock); | |
128 | ||
1d001df1 AK |
129 | current->state = TASK_INTERRUPTIBLE; |
130 | schedule(); | |
5a8da0ea | 131 | set_restore_sigmask(); |
1d001df1 | 132 | return -ERESTARTNOHAND; |
1da177e4 LT |
133 | } |
134 | ||
99b9cdf7 TG |
135 | asmlinkage long sys32_sigaltstack(const stack_ia32_t __user *uss_ptr, |
136 | stack_ia32_t __user *uoss_ptr, | |
137 | struct pt_regs *regs) | |
1da177e4 | 138 | { |
99b9cdf7 | 139 | stack_t uss, uoss; |
1da177e4 | 140 | int ret; |
99b9cdf7 TG |
141 | mm_segment_t seg; |
142 | ||
143 | if (uss_ptr) { | |
1da177e4 | 144 | u32 ptr; |
99b9cdf7 TG |
145 | |
146 | memset(&uss, 0, sizeof(stack_t)); | |
147 | if (!access_ok(VERIFY_READ, uss_ptr, sizeof(stack_ia32_t)) || | |
1da177e4 LT |
148 | __get_user(ptr, &uss_ptr->ss_sp) || |
149 | __get_user(uss.ss_flags, &uss_ptr->ss_flags) || | |
150 | __get_user(uss.ss_size, &uss_ptr->ss_size)) | |
151 | return -EFAULT; | |
152 | uss.ss_sp = compat_ptr(ptr); | |
153 | } | |
99b9cdf7 TG |
154 | seg = get_fs(); |
155 | set_fs(KERNEL_DS); | |
65ea5b03 | 156 | ret = do_sigaltstack(uss_ptr ? &uss : NULL, &uoss, regs->sp); |
99b9cdf7 | 157 | set_fs(seg); |
1da177e4 | 158 | if (ret >= 0 && uoss_ptr) { |
99b9cdf7 | 159 | if (!access_ok(VERIFY_WRITE, uoss_ptr, sizeof(stack_ia32_t)) || |
1da177e4 LT |
160 | __put_user(ptr_to_compat(uoss.ss_sp), &uoss_ptr->ss_sp) || |
161 | __put_user(uoss.ss_flags, &uoss_ptr->ss_flags) || | |
162 | __put_user(uoss.ss_size, &uoss_ptr->ss_size)) | |
163 | ret = -EFAULT; | |
99b9cdf7 TG |
164 | } |
165 | return ret; | |
1da177e4 LT |
166 | } |
167 | ||
168 | /* | |
169 | * Do a signal return; undo the signal stack. | |
170 | */ | |
171 | ||
172 | struct sigframe | |
173 | { | |
174 | u32 pretcode; | |
175 | int sig; | |
176 | struct sigcontext_ia32 sc; | |
177 | struct _fpstate_ia32 fpstate; | |
178 | unsigned int extramask[_COMPAT_NSIG_WORDS-1]; | |
179 | char retcode[8]; | |
180 | }; | |
181 | ||
182 | struct rt_sigframe | |
183 | { | |
184 | u32 pretcode; | |
185 | int sig; | |
186 | u32 pinfo; | |
187 | u32 puc; | |
188 | compat_siginfo_t info; | |
189 | struct ucontext_ia32 uc; | |
190 | struct _fpstate_ia32 fpstate; | |
191 | char retcode[8]; | |
192 | }; | |
193 | ||
742fa54a PA |
194 | #define COPY(x) { \ |
195 | unsigned int reg; \ | |
196 | err |= __get_user(reg, &sc->x); \ | |
65ea5b03 | 197 | regs->x = reg; \ |
1da177e4 LT |
198 | } |
199 | ||
200 | #define RELOAD_SEG(seg,mask) \ | |
99b9cdf7 | 201 | { unsigned int cur; \ |
1da177e4 LT |
202 | unsigned short pre; \ |
203 | err |= __get_user(pre, &sc->seg); \ | |
99b9cdf7 TG |
204 | asm volatile("movl %%" #seg ",%0" : "=r" (cur)); \ |
205 | pre |= mask; \ | |
206 | if (pre != cur) loadsegment(seg, pre); } | |
207 | ||
208 | static int ia32_restore_sigcontext(struct pt_regs *regs, | |
209 | struct sigcontext_ia32 __user *sc, | |
210 | unsigned int *peax) | |
211 | { | |
212 | unsigned int tmpflags, gs, oldgs, err = 0; | |
213 | struct _fpstate_ia32 __user *buf; | |
214 | u32 tmp; | |
215 | ||
216 | /* Always make any pending restarted system calls return -EINTR */ | |
217 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
218 | ||
219 | #if DEBUG_SIG | |
220 | printk(KERN_DEBUG "SIG restore_sigcontext: " | |
221 | "sc=%p err(%x) eip(%x) cs(%x) flg(%x)\n", | |
65ea5b03 | 222 | sc, sc->err, sc->ip, sc->cs, sc->flags); |
99b9cdf7 TG |
223 | #endif |
224 | ||
225 | /* | |
226 | * Reload fs and gs if they have changed in the signal | |
227 | * handler. This does not handle long fs/gs base changes in | |
228 | * the handler, but does not clobber them at least in the | |
229 | * normal case. | |
230 | */ | |
231 | err |= __get_user(gs, &sc->gs); | |
232 | gs |= 3; | |
233 | asm("movl %%gs,%0" : "=r" (oldgs)); | |
234 | if (gs != oldgs) | |
235 | load_gs_index(gs); | |
236 | ||
237 | RELOAD_SEG(fs, 3); | |
238 | RELOAD_SEG(ds, 3); | |
239 | RELOAD_SEG(es, 3); | |
1da177e4 LT |
240 | |
241 | COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx); | |
242 | COPY(dx); COPY(cx); COPY(ip); | |
99b9cdf7 TG |
243 | /* Don't touch extended registers */ |
244 | ||
245 | err |= __get_user(regs->cs, &sc->cs); | |
246 | regs->cs |= 3; | |
247 | err |= __get_user(regs->ss, &sc->ss); | |
248 | regs->ss |= 3; | |
249 | ||
742fa54a | 250 | err |= __get_user(tmpflags, &sc->flags); |
65ea5b03 | 251 | regs->flags = (regs->flags & ~0x40DD5) | (tmpflags & 0x40DD5); |
99b9cdf7 | 252 | /* disable syscall checks */ |
65ea5b03 | 253 | regs->orig_ax = -1; |
99b9cdf7 TG |
254 | |
255 | err |= __get_user(tmp, &sc->fpstate); | |
256 | buf = compat_ptr(tmp); | |
257 | if (buf) { | |
258 | if (!access_ok(VERIFY_READ, buf, sizeof(*buf))) | |
259 | goto badframe; | |
44210111 | 260 | err |= restore_i387_ia32(buf); |
99b9cdf7 TG |
261 | } else { |
262 | struct task_struct *me = current; | |
1da177e4 | 263 | |
99b9cdf7 TG |
264 | if (used_math()) { |
265 | clear_fpu(me); | |
266 | clear_used_math(); | |
1da177e4 LT |
267 | } |
268 | } | |
269 | ||
742fa54a | 270 | err |= __get_user(tmp, &sc->ax); |
99b9cdf7 TG |
271 | *peax = tmp; |
272 | ||
1da177e4 LT |
273 | return err; |
274 | ||
275 | badframe: | |
276 | return 1; | |
277 | } | |
278 | ||
279 | asmlinkage long sys32_sigreturn(struct pt_regs *regs) | |
280 | { | |
65ea5b03 | 281 | struct sigframe __user *frame = (struct sigframe __user *)(regs->sp-8); |
1da177e4 | 282 | sigset_t set; |
65ea5b03 | 283 | unsigned int ax; |
1da177e4 LT |
284 | |
285 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
286 | goto badframe; | |
287 | if (__get_user(set.sig[0], &frame->sc.oldmask) | |
288 | || (_COMPAT_NSIG_WORDS > 1 | |
99b9cdf7 TG |
289 | && __copy_from_user((((char *) &set.sig) + 4), |
290 | &frame->extramask, | |
1da177e4 LT |
291 | sizeof(frame->extramask)))) |
292 | goto badframe; | |
293 | ||
294 | sigdelsetmask(&set, ~_BLOCKABLE); | |
295 | spin_lock_irq(¤t->sighand->siglock); | |
296 | current->blocked = set; | |
297 | recalc_sigpending(); | |
298 | spin_unlock_irq(¤t->sighand->siglock); | |
99b9cdf7 | 299 | |
65ea5b03 | 300 | if (ia32_restore_sigcontext(regs, &frame->sc, &ax)) |
1da177e4 | 301 | goto badframe; |
65ea5b03 | 302 | return ax; |
1da177e4 LT |
303 | |
304 | badframe: | |
305 | signal_fault(regs, frame, "32bit sigreturn"); | |
306 | return 0; | |
99b9cdf7 | 307 | } |
1da177e4 LT |
308 | |
309 | asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs) | |
310 | { | |
311 | struct rt_sigframe __user *frame; | |
312 | sigset_t set; | |
65ea5b03 | 313 | unsigned int ax; |
1da177e4 LT |
314 | struct pt_regs tregs; |
315 | ||
65ea5b03 | 316 | frame = (struct rt_sigframe __user *)(regs->sp - 4); |
1da177e4 LT |
317 | |
318 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
319 | goto badframe; | |
320 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
321 | goto badframe; | |
322 | ||
323 | sigdelsetmask(&set, ~_BLOCKABLE); | |
324 | spin_lock_irq(¤t->sighand->siglock); | |
325 | current->blocked = set; | |
326 | recalc_sigpending(); | |
327 | spin_unlock_irq(¤t->sighand->siglock); | |
99b9cdf7 | 328 | |
65ea5b03 | 329 | if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax)) |
1da177e4 LT |
330 | goto badframe; |
331 | ||
332 | tregs = *regs; | |
333 | if (sys32_sigaltstack(&frame->uc.uc_stack, NULL, &tregs) == -EFAULT) | |
334 | goto badframe; | |
335 | ||
65ea5b03 | 336 | return ax; |
1da177e4 LT |
337 | |
338 | badframe: | |
99b9cdf7 | 339 | signal_fault(regs, frame, "32bit rt sigreturn"); |
1da177e4 | 340 | return 0; |
99b9cdf7 | 341 | } |
1da177e4 LT |
342 | |
343 | /* | |
344 | * Set up a signal frame. | |
345 | */ | |
346 | ||
99b9cdf7 TG |
347 | static int ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc, |
348 | struct _fpstate_ia32 __user *fpstate, | |
349 | struct pt_regs *regs, unsigned int mask) | |
1da177e4 LT |
350 | { |
351 | int tmp, err = 0; | |
1da177e4 LT |
352 | |
353 | tmp = 0; | |
354 | __asm__("movl %%gs,%0" : "=r"(tmp): "0"(tmp)); | |
355 | err |= __put_user(tmp, (unsigned int __user *)&sc->gs); | |
356 | __asm__("movl %%fs,%0" : "=r"(tmp): "0"(tmp)); | |
357 | err |= __put_user(tmp, (unsigned int __user *)&sc->fs); | |
358 | __asm__("movl %%ds,%0" : "=r"(tmp): "0"(tmp)); | |
359 | err |= __put_user(tmp, (unsigned int __user *)&sc->ds); | |
360 | __asm__("movl %%es,%0" : "=r"(tmp): "0"(tmp)); | |
361 | err |= __put_user(tmp, (unsigned int __user *)&sc->es); | |
362 | ||
742fa54a PA |
363 | err |= __put_user((u32)regs->di, &sc->di); |
364 | err |= __put_user((u32)regs->si, &sc->si); | |
365 | err |= __put_user((u32)regs->bp, &sc->bp); | |
366 | err |= __put_user((u32)regs->sp, &sc->sp); | |
367 | err |= __put_user((u32)regs->bx, &sc->bx); | |
368 | err |= __put_user((u32)regs->dx, &sc->dx); | |
369 | err |= __put_user((u32)regs->cx, &sc->cx); | |
370 | err |= __put_user((u32)regs->ax, &sc->ax); | |
1da177e4 LT |
371 | err |= __put_user((u32)regs->cs, &sc->cs); |
372 | err |= __put_user((u32)regs->ss, &sc->ss); | |
373 | err |= __put_user(current->thread.trap_no, &sc->trapno); | |
374 | err |= __put_user(current->thread.error_code, &sc->err); | |
742fa54a PA |
375 | err |= __put_user((u32)regs->ip, &sc->ip); |
376 | err |= __put_user((u32)regs->flags, &sc->flags); | |
377 | err |= __put_user((u32)regs->sp, &sc->sp_at_signal); | |
1da177e4 | 378 | |
44210111 | 379 | tmp = save_i387_ia32(fpstate); |
1da177e4 LT |
380 | if (tmp < 0) |
381 | err = -EFAULT; | |
99b9cdf7 | 382 | else { |
1da177e4 LT |
383 | clear_used_math(); |
384 | stts(); | |
385 | err |= __put_user(ptr_to_compat(tmp ? fpstate : NULL), | |
386 | &sc->fpstate); | |
387 | } | |
388 | ||
389 | /* non-iBCS2 extensions.. */ | |
390 | err |= __put_user(mask, &sc->oldmask); | |
391 | err |= __put_user(current->thread.cr2, &sc->cr2); | |
392 | ||
393 | return err; | |
394 | } | |
395 | ||
396 | /* | |
397 | * Determine which stack to use.. | |
398 | */ | |
99b9cdf7 TG |
399 | static void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, |
400 | size_t frame_size) | |
1da177e4 | 401 | { |
65ea5b03 | 402 | unsigned long sp; |
1da177e4 LT |
403 | |
404 | /* Default to using normal stack */ | |
65ea5b03 | 405 | sp = regs->sp; |
1da177e4 LT |
406 | |
407 | /* This is the X/Open sanctioned signal stack switching. */ | |
408 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
65ea5b03 PA |
409 | if (sas_ss_flags(sp) == 0) |
410 | sp = current->sas_ss_sp + current->sas_ss_size; | |
1da177e4 LT |
411 | } |
412 | ||
413 | /* This is the legacy signal stack switching. */ | |
414 | else if ((regs->ss & 0xffff) != __USER_DS && | |
415 | !(ka->sa.sa_flags & SA_RESTORER) && | |
99b9cdf7 | 416 | ka->sa.sa_restorer) |
65ea5b03 | 417 | sp = (unsigned long) ka->sa.sa_restorer; |
1da177e4 | 418 | |
65ea5b03 | 419 | sp -= frame_size; |
d347f372 MO |
420 | /* Align the stack pointer according to the i386 ABI, |
421 | * i.e. so that on function entry ((sp + 4) & 15) == 0. */ | |
65ea5b03 PA |
422 | sp = ((sp + 4) & -16ul) - 4; |
423 | return (void __user *) sp; | |
1da177e4 LT |
424 | } |
425 | ||
0928d6ef | 426 | int ia32_setup_frame(int sig, struct k_sigaction *ka, |
99b9cdf7 | 427 | compat_sigset_t *set, struct pt_regs *regs) |
1da177e4 LT |
428 | { |
429 | struct sigframe __user *frame; | |
99b9cdf7 | 430 | void __user *restorer; |
1da177e4 LT |
431 | int err = 0; |
432 | ||
99b9cdf7 TG |
433 | /* copy_to_user optimizes that into a single 8 byte store */ |
434 | static const struct { | |
435 | u16 poplmovl; | |
436 | u32 val; | |
437 | u16 int80; | |
438 | u16 pad; | |
439 | } __attribute__((packed)) code = { | |
440 | 0xb858, /* popl %eax ; movl $...,%eax */ | |
441 | __NR_ia32_sigreturn, | |
442 | 0x80cd, /* int $0x80 */ | |
443 | 0, | |
444 | }; | |
445 | ||
1da177e4 LT |
446 | frame = get_sigframe(ka, regs, sizeof(*frame)); |
447 | ||
448 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
449 | goto give_sigsegv; | |
450 | ||
dd54a110 | 451 | err |= __put_user(sig, &frame->sig); |
1da177e4 LT |
452 | if (err) |
453 | goto give_sigsegv; | |
454 | ||
455 | err |= ia32_setup_sigcontext(&frame->sc, &frame->fpstate, regs, | |
456 | set->sig[0]); | |
457 | if (err) | |
458 | goto give_sigsegv; | |
459 | ||
460 | if (_COMPAT_NSIG_WORDS > 1) { | |
461 | err |= __copy_to_user(frame->extramask, &set->sig[1], | |
462 | sizeof(frame->extramask)); | |
99b9cdf7 TG |
463 | if (err) |
464 | goto give_sigsegv; | |
1da177e4 | 465 | } |
1da177e4 | 466 | |
af65d648 | 467 | if (ka->sa.sa_flags & SA_RESTORER) { |
99b9cdf7 | 468 | restorer = ka->sa.sa_restorer; |
af65d648 RM |
469 | } else { |
470 | /* Return stub is in 32bit vsyscall page */ | |
1a3e4ca4 | 471 | if (current->mm->context.vdso) |
af65d648 RM |
472 | restorer = VDSO32_SYMBOL(current->mm->context.vdso, |
473 | sigreturn); | |
474 | else | |
ade1af77 | 475 | restorer = &frame->retcode; |
af65d648 | 476 | } |
99b9cdf7 TG |
477 | err |= __put_user(ptr_to_compat(restorer), &frame->pretcode); |
478 | ||
479 | /* | |
480 | * These are actually not used anymore, but left because some | |
481 | * gdb versions depend on them as a marker. | |
482 | */ | |
483 | err |= __copy_to_user(frame->retcode, &code, 8); | |
1da177e4 LT |
484 | if (err) |
485 | goto give_sigsegv; | |
486 | ||
487 | /* Set up registers for signal handler */ | |
65ea5b03 PA |
488 | regs->sp = (unsigned long) frame; |
489 | regs->ip = (unsigned long) ka->sa.sa_handler; | |
1da177e4 | 490 | |
536e3ee4 | 491 | /* Make -mregparm=3 work */ |
65ea5b03 PA |
492 | regs->ax = sig; |
493 | regs->dx = 0; | |
494 | regs->cx = 0; | |
536e3ee4 | 495 | |
99b9cdf7 TG |
496 | asm volatile("movl %0,%%ds" :: "r" (__USER32_DS)); |
497 | asm volatile("movl %0,%%es" :: "r" (__USER32_DS)); | |
1da177e4 | 498 | |
99b9cdf7 TG |
499 | regs->cs = __USER32_CS; |
500 | regs->ss = __USER32_DS; | |
1da177e4 | 501 | |
1da177e4 | 502 | #if DEBUG_SIG |
99b9cdf7 | 503 | printk(KERN_DEBUG "SIG deliver (%s:%d): sp=%p pc=%lx ra=%u\n", |
65ea5b03 | 504 | current->comm, current->pid, frame, regs->ip, frame->pretcode); |
1da177e4 LT |
505 | #endif |
506 | ||
1d001df1 | 507 | return 0; |
1da177e4 LT |
508 | |
509 | give_sigsegv: | |
510 | force_sigsegv(sig, current); | |
1d001df1 | 511 | return -EFAULT; |
1da177e4 LT |
512 | } |
513 | ||
0928d6ef | 514 | int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
99b9cdf7 | 515 | compat_sigset_t *set, struct pt_regs *regs) |
1da177e4 LT |
516 | { |
517 | struct rt_sigframe __user *frame; | |
99b9cdf7 | 518 | struct exec_domain *ed = current_thread_info()->exec_domain; |
af65d648 | 519 | void __user *restorer; |
1da177e4 LT |
520 | int err = 0; |
521 | ||
99b9cdf7 TG |
522 | /* __copy_to_user optimizes that into a single 8 byte store */ |
523 | static const struct { | |
524 | u8 movl; | |
525 | u32 val; | |
526 | u16 int80; | |
527 | u16 pad; | |
528 | u8 pad2; | |
529 | } __attribute__((packed)) code = { | |
530 | 0xb8, | |
531 | __NR_ia32_rt_sigreturn, | |
532 | 0x80cd, | |
533 | 0, | |
534 | }; | |
535 | ||
1da177e4 LT |
536 | frame = get_sigframe(ka, regs, sizeof(*frame)); |
537 | ||
538 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
539 | goto give_sigsegv; | |
540 | ||
99b9cdf7 TG |
541 | err |= __put_user((ed && ed->signal_invmap && sig < 32 |
542 | ? ed->signal_invmap[sig] : sig), &frame->sig); | |
1da177e4 LT |
543 | err |= __put_user(ptr_to_compat(&frame->info), &frame->pinfo); |
544 | err |= __put_user(ptr_to_compat(&frame->uc), &frame->puc); | |
545 | err |= copy_siginfo_to_user32(&frame->info, info); | |
546 | if (err) | |
547 | goto give_sigsegv; | |
548 | ||
549 | /* Create the ucontext. */ | |
550 | err |= __put_user(0, &frame->uc.uc_flags); | |
551 | err |= __put_user(0, &frame->uc.uc_link); | |
552 | err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
65ea5b03 | 553 | err |= __put_user(sas_ss_flags(regs->sp), |
1da177e4 LT |
554 | &frame->uc.uc_stack.ss_flags); |
555 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
556 | err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate, | |
99b9cdf7 | 557 | regs, set->sig[0]); |
1da177e4 LT |
558 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
559 | if (err) | |
560 | goto give_sigsegv; | |
561 | ||
99b9cdf7 TG |
562 | if (ka->sa.sa_flags & SA_RESTORER) |
563 | restorer = ka->sa.sa_restorer; | |
af65d648 RM |
564 | else |
565 | restorer = VDSO32_SYMBOL(current->mm->context.vdso, | |
566 | rt_sigreturn); | |
99b9cdf7 | 567 | err |= __put_user(ptr_to_compat(restorer), &frame->pretcode); |
1da177e4 | 568 | |
99b9cdf7 TG |
569 | /* |
570 | * Not actually used anymore, but left because some gdb | |
571 | * versions need it. | |
572 | */ | |
573 | err |= __copy_to_user(frame->retcode, &code, 8); | |
1da177e4 LT |
574 | if (err) |
575 | goto give_sigsegv; | |
576 | ||
577 | /* Set up registers for signal handler */ | |
65ea5b03 PA |
578 | regs->sp = (unsigned long) frame; |
579 | regs->ip = (unsigned long) ka->sa.sa_handler; | |
1da177e4 | 580 | |
a7aacdf9 | 581 | /* Make -mregparm=3 work */ |
65ea5b03 PA |
582 | regs->ax = sig; |
583 | regs->dx = (unsigned long) &frame->info; | |
584 | regs->cx = (unsigned long) &frame->uc; | |
a7aacdf9 | 585 | |
8e3de538 | 586 | /* Make -mregparm=3 work */ |
65ea5b03 PA |
587 | regs->ax = sig; |
588 | regs->dx = (unsigned long) &frame->info; | |
589 | regs->cx = (unsigned long) &frame->uc; | |
8e3de538 | 590 | |
99b9cdf7 TG |
591 | asm volatile("movl %0,%%ds" :: "r" (__USER32_DS)); |
592 | asm volatile("movl %0,%%es" :: "r" (__USER32_DS)); | |
593 | ||
594 | regs->cs = __USER32_CS; | |
595 | regs->ss = __USER32_DS; | |
1da177e4 | 596 | |
1da177e4 | 597 | #if DEBUG_SIG |
99b9cdf7 | 598 | printk(KERN_DEBUG "SIG deliver (%s:%d): sp=%p pc=%lx ra=%u\n", |
65ea5b03 | 599 | current->comm, current->pid, frame, regs->ip, frame->pretcode); |
1da177e4 LT |
600 | #endif |
601 | ||
1d001df1 | 602 | return 0; |
1da177e4 LT |
603 | |
604 | give_sigsegv: | |
605 | force_sigsegv(sig, current); | |
1d001df1 | 606 | return -EFAULT; |
1da177e4 | 607 | } |