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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 | |
9 | * | |
10 | * $Id: ia32_signal.c,v 1.22 2002/07/29 10:34:03 ak Exp $ | |
11 | */ | |
12 | ||
13 | #include <linux/sched.h> | |
14 | #include <linux/mm.h> | |
15 | #include <linux/smp.h> | |
16 | #include <linux/smp_lock.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/signal.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/wait.h> | |
21 | #include <linux/ptrace.h> | |
22 | #include <linux/unistd.h> | |
23 | #include <linux/stddef.h> | |
24 | #include <linux/personality.h> | |
25 | #include <linux/compat.h> | |
26 | #include <asm/ucontext.h> | |
27 | #include <asm/uaccess.h> | |
28 | #include <asm/i387.h> | |
29 | #include <asm/ia32.h> | |
30 | #include <asm/ptrace.h> | |
31 | #include <asm/ia32_unistd.h> | |
32 | #include <asm/user32.h> | |
33 | #include <asm/sigcontext32.h> | |
34 | #include <asm/fpu32.h> | |
35 | #include <asm/proto.h> | |
36 | #include <asm/vsyscall32.h> | |
37 | ||
38 | #define DEBUG_SIG 0 | |
39 | ||
40 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
41 | ||
42 | asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset); | |
43 | void signal_fault(struct pt_regs *regs, void __user *frame, char *where); | |
44 | ||
45 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) | |
46 | { | |
47 | int err; | |
48 | if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t))) | |
49 | return -EFAULT; | |
50 | ||
51 | /* If you change siginfo_t structure, please make sure that | |
52 | this code is fixed accordingly. | |
53 | It should never copy any pad contained in the structure | |
54 | to avoid security leaks, but must copy the generic | |
55 | 3 ints plus the relevant union member. */ | |
56 | err = __put_user(from->si_signo, &to->si_signo); | |
57 | err |= __put_user(from->si_errno, &to->si_errno); | |
58 | err |= __put_user((short)from->si_code, &to->si_code); | |
59 | ||
60 | if (from->si_code < 0) { | |
61 | err |= __put_user(from->si_pid, &to->si_pid); | |
62 | err |= __put_user(from->si_uid, &to->si_uid); | |
63 | err |= __put_user(ptr_to_compat(from->si_ptr), &to->si_ptr); | |
64 | } else { | |
65 | /* First 32bits of unions are always present: | |
66 | * si_pid === si_band === si_tid === si_addr(LS half) */ | |
67 | err |= __put_user(from->_sifields._pad[0], &to->_sifields._pad[0]); | |
68 | switch (from->si_code >> 16) { | |
69 | case __SI_FAULT >> 16: | |
70 | break; | |
71 | case __SI_CHLD >> 16: | |
72 | err |= __put_user(from->si_utime, &to->si_utime); | |
73 | err |= __put_user(from->si_stime, &to->si_stime); | |
74 | err |= __put_user(from->si_status, &to->si_status); | |
75 | /* FALL THROUGH */ | |
76 | default: | |
77 | case __SI_KILL >> 16: | |
78 | err |= __put_user(from->si_uid, &to->si_uid); | |
79 | break; | |
80 | case __SI_POLL >> 16: | |
81 | err |= __put_user(from->si_fd, &to->si_fd); | |
82 | break; | |
83 | case __SI_TIMER >> 16: | |
84 | err |= __put_user(from->si_overrun, &to->si_overrun); | |
85 | err |= __put_user(ptr_to_compat(from->si_ptr), | |
86 | &to->si_ptr); | |
87 | break; | |
88 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
89 | case __SI_MESGQ >> 16: | |
90 | err |= __put_user(from->si_uid, &to->si_uid); | |
91 | err |= __put_user(from->si_int, &to->si_int); | |
92 | break; | |
93 | } | |
94 | } | |
95 | return err; | |
96 | } | |
97 | ||
98 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) | |
99 | { | |
100 | int err; | |
101 | u32 ptr32; | |
102 | if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t))) | |
103 | return -EFAULT; | |
104 | ||
105 | err = __get_user(to->si_signo, &from->si_signo); | |
106 | err |= __get_user(to->si_errno, &from->si_errno); | |
107 | err |= __get_user(to->si_code, &from->si_code); | |
108 | ||
109 | err |= __get_user(to->si_pid, &from->si_pid); | |
110 | err |= __get_user(to->si_uid, &from->si_uid); | |
111 | err |= __get_user(ptr32, &from->si_ptr); | |
112 | to->si_ptr = compat_ptr(ptr32); | |
113 | ||
114 | return err; | |
115 | } | |
116 | ||
117 | asmlinkage long | |
118 | sys32_sigsuspend(int history0, int history1, old_sigset_t mask, | |
119 | struct pt_regs *regs) | |
120 | { | |
121 | sigset_t saveset; | |
122 | ||
123 | mask &= _BLOCKABLE; | |
124 | spin_lock_irq(¤t->sighand->siglock); | |
125 | saveset = current->blocked; | |
126 | siginitset(¤t->blocked, mask); | |
127 | recalc_sigpending(); | |
128 | spin_unlock_irq(¤t->sighand->siglock); | |
129 | ||
130 | regs->rax = -EINTR; | |
131 | while (1) { | |
132 | current->state = TASK_INTERRUPTIBLE; | |
133 | schedule(); | |
134 | if (do_signal(regs, &saveset)) | |
135 | return -EINTR; | |
136 | } | |
137 | } | |
138 | ||
139 | asmlinkage long | |
140 | sys32_sigaltstack(const stack_ia32_t __user *uss_ptr, | |
141 | stack_ia32_t __user *uoss_ptr, | |
142 | struct pt_regs *regs) | |
143 | { | |
144 | stack_t uss,uoss; | |
145 | int ret; | |
146 | mm_segment_t seg; | |
147 | if (uss_ptr) { | |
148 | u32 ptr; | |
149 | memset(&uss,0,sizeof(stack_t)); | |
150 | if (!access_ok(VERIFY_READ,uss_ptr,sizeof(stack_ia32_t)) || | |
151 | __get_user(ptr, &uss_ptr->ss_sp) || | |
152 | __get_user(uss.ss_flags, &uss_ptr->ss_flags) || | |
153 | __get_user(uss.ss_size, &uss_ptr->ss_size)) | |
154 | return -EFAULT; | |
155 | uss.ss_sp = compat_ptr(ptr); | |
156 | } | |
157 | seg = get_fs(); | |
158 | set_fs(KERNEL_DS); | |
159 | ret = do_sigaltstack(uss_ptr ? &uss : NULL, &uoss, regs->rsp); | |
160 | set_fs(seg); | |
161 | if (ret >= 0 && uoss_ptr) { | |
162 | if (!access_ok(VERIFY_WRITE,uoss_ptr,sizeof(stack_ia32_t)) || | |
163 | __put_user(ptr_to_compat(uoss.ss_sp), &uoss_ptr->ss_sp) || | |
164 | __put_user(uoss.ss_flags, &uoss_ptr->ss_flags) || | |
165 | __put_user(uoss.ss_size, &uoss_ptr->ss_size)) | |
166 | ret = -EFAULT; | |
167 | } | |
168 | return ret; | |
169 | } | |
170 | ||
171 | /* | |
172 | * Do a signal return; undo the signal stack. | |
173 | */ | |
174 | ||
175 | struct sigframe | |
176 | { | |
177 | u32 pretcode; | |
178 | int sig; | |
179 | struct sigcontext_ia32 sc; | |
180 | struct _fpstate_ia32 fpstate; | |
181 | unsigned int extramask[_COMPAT_NSIG_WORDS-1]; | |
182 | char retcode[8]; | |
183 | }; | |
184 | ||
185 | struct rt_sigframe | |
186 | { | |
187 | u32 pretcode; | |
188 | int sig; | |
189 | u32 pinfo; | |
190 | u32 puc; | |
191 | compat_siginfo_t info; | |
192 | struct ucontext_ia32 uc; | |
193 | struct _fpstate_ia32 fpstate; | |
194 | char retcode[8]; | |
195 | }; | |
196 | ||
197 | static int | |
198 | ia32_restore_sigcontext(struct pt_regs *regs, struct sigcontext_ia32 __user *sc, unsigned int *peax) | |
199 | { | |
200 | unsigned int err = 0; | |
201 | ||
202 | /* Always make any pending restarted system calls return -EINTR */ | |
203 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
204 | ||
205 | #if DEBUG_SIG | |
206 | printk("SIG restore_sigcontext: sc=%p err(%x) eip(%x) cs(%x) flg(%x)\n", | |
207 | sc, sc->err, sc->eip, sc->cs, sc->eflags); | |
208 | #endif | |
209 | #define COPY(x) { \ | |
210 | unsigned int reg; \ | |
211 | err |= __get_user(reg, &sc->e ##x); \ | |
212 | regs->r ## x = reg; \ | |
213 | } | |
214 | ||
215 | #define RELOAD_SEG(seg,mask) \ | |
216 | { unsigned int cur; \ | |
217 | unsigned short pre; \ | |
218 | err |= __get_user(pre, &sc->seg); \ | |
219 | asm volatile("movl %%" #seg ",%0" : "=r" (cur)); \ | |
220 | pre |= mask; \ | |
221 | if (pre != cur) loadsegment(seg,pre); } | |
222 | ||
223 | /* Reload fs and gs if they have changed in the signal handler. | |
224 | This does not handle long fs/gs base changes in the handler, but | |
225 | does not clobber them at least in the normal case. */ | |
226 | ||
227 | { | |
228 | unsigned gs, oldgs; | |
229 | err |= __get_user(gs, &sc->gs); | |
230 | gs |= 3; | |
231 | asm("movl %%gs,%0" : "=r" (oldgs)); | |
232 | if (gs != oldgs) | |
233 | load_gs_index(gs); | |
234 | } | |
235 | RELOAD_SEG(fs,3); | |
236 | RELOAD_SEG(ds,3); | |
237 | RELOAD_SEG(es,3); | |
238 | ||
239 | COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx); | |
240 | COPY(dx); COPY(cx); COPY(ip); | |
241 | /* Don't touch extended registers */ | |
242 | ||
243 | err |= __get_user(regs->cs, &sc->cs); | |
244 | regs->cs |= 3; | |
245 | err |= __get_user(regs->ss, &sc->ss); | |
246 | regs->ss |= 3; | |
247 | ||
248 | { | |
249 | unsigned int tmpflags; | |
250 | err |= __get_user(tmpflags, &sc->eflags); | |
251 | regs->eflags = (regs->eflags & ~0x40DD5) | (tmpflags & 0x40DD5); | |
252 | regs->orig_rax = -1; /* disable syscall checks */ | |
253 | } | |
254 | ||
255 | { | |
256 | u32 tmp; | |
257 | struct _fpstate_ia32 __user * buf; | |
258 | err |= __get_user(tmp, &sc->fpstate); | |
259 | buf = compat_ptr(tmp); | |
260 | if (buf) { | |
261 | if (!access_ok(VERIFY_READ, buf, sizeof(*buf))) | |
262 | goto badframe; | |
263 | err |= restore_i387_ia32(current, buf, 0); | |
264 | } else { | |
265 | struct task_struct *me = current; | |
266 | if (used_math()) { | |
267 | clear_fpu(me); | |
268 | clear_used_math(); | |
269 | } | |
270 | } | |
271 | } | |
272 | ||
273 | { | |
274 | u32 tmp; | |
275 | err |= __get_user(tmp, &sc->eax); | |
276 | *peax = tmp; | |
277 | } | |
278 | return err; | |
279 | ||
280 | badframe: | |
281 | return 1; | |
282 | } | |
283 | ||
284 | asmlinkage long sys32_sigreturn(struct pt_regs *regs) | |
285 | { | |
286 | struct sigframe __user *frame = (struct sigframe __user *)(regs->rsp-8); | |
287 | sigset_t set; | |
288 | unsigned int eax; | |
289 | ||
290 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
291 | goto badframe; | |
292 | if (__get_user(set.sig[0], &frame->sc.oldmask) | |
293 | || (_COMPAT_NSIG_WORDS > 1 | |
294 | && __copy_from_user((((char *) &set.sig) + 4), &frame->extramask, | |
295 | sizeof(frame->extramask)))) | |
296 | goto badframe; | |
297 | ||
298 | sigdelsetmask(&set, ~_BLOCKABLE); | |
299 | spin_lock_irq(¤t->sighand->siglock); | |
300 | current->blocked = set; | |
301 | recalc_sigpending(); | |
302 | spin_unlock_irq(¤t->sighand->siglock); | |
303 | ||
304 | if (ia32_restore_sigcontext(regs, &frame->sc, &eax)) | |
305 | goto badframe; | |
306 | return eax; | |
307 | ||
308 | badframe: | |
309 | signal_fault(regs, frame, "32bit sigreturn"); | |
310 | return 0; | |
311 | } | |
312 | ||
313 | asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs) | |
314 | { | |
315 | struct rt_sigframe __user *frame; | |
316 | sigset_t set; | |
317 | unsigned int eax; | |
318 | struct pt_regs tregs; | |
319 | ||
320 | frame = (struct rt_sigframe __user *)(regs->rsp - 4); | |
321 | ||
322 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
323 | goto badframe; | |
324 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
325 | goto badframe; | |
326 | ||
327 | sigdelsetmask(&set, ~_BLOCKABLE); | |
328 | spin_lock_irq(¤t->sighand->siglock); | |
329 | current->blocked = set; | |
330 | recalc_sigpending(); | |
331 | spin_unlock_irq(¤t->sighand->siglock); | |
332 | ||
333 | if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext, &eax)) | |
334 | goto badframe; | |
335 | ||
336 | tregs = *regs; | |
337 | if (sys32_sigaltstack(&frame->uc.uc_stack, NULL, &tregs) == -EFAULT) | |
338 | goto badframe; | |
339 | ||
340 | return eax; | |
341 | ||
342 | badframe: | |
343 | signal_fault(regs,frame,"32bit rt sigreturn"); | |
344 | return 0; | |
345 | } | |
346 | ||
347 | /* | |
348 | * Set up a signal frame. | |
349 | */ | |
350 | ||
351 | static int | |
352 | ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc, struct _fpstate_ia32 __user *fpstate, | |
353 | struct pt_regs *regs, unsigned int mask) | |
354 | { | |
355 | int tmp, err = 0; | |
356 | u32 eflags; | |
357 | ||
358 | tmp = 0; | |
359 | __asm__("movl %%gs,%0" : "=r"(tmp): "0"(tmp)); | |
360 | err |= __put_user(tmp, (unsigned int __user *)&sc->gs); | |
361 | __asm__("movl %%fs,%0" : "=r"(tmp): "0"(tmp)); | |
362 | err |= __put_user(tmp, (unsigned int __user *)&sc->fs); | |
363 | __asm__("movl %%ds,%0" : "=r"(tmp): "0"(tmp)); | |
364 | err |= __put_user(tmp, (unsigned int __user *)&sc->ds); | |
365 | __asm__("movl %%es,%0" : "=r"(tmp): "0"(tmp)); | |
366 | err |= __put_user(tmp, (unsigned int __user *)&sc->es); | |
367 | ||
368 | err |= __put_user((u32)regs->rdi, &sc->edi); | |
369 | err |= __put_user((u32)regs->rsi, &sc->esi); | |
370 | err |= __put_user((u32)regs->rbp, &sc->ebp); | |
371 | err |= __put_user((u32)regs->rsp, &sc->esp); | |
372 | err |= __put_user((u32)regs->rbx, &sc->ebx); | |
373 | err |= __put_user((u32)regs->rdx, &sc->edx); | |
374 | err |= __put_user((u32)regs->rcx, &sc->ecx); | |
375 | err |= __put_user((u32)regs->rax, &sc->eax); | |
376 | err |= __put_user((u32)regs->cs, &sc->cs); | |
377 | err |= __put_user((u32)regs->ss, &sc->ss); | |
378 | err |= __put_user(current->thread.trap_no, &sc->trapno); | |
379 | err |= __put_user(current->thread.error_code, &sc->err); | |
380 | err |= __put_user((u32)regs->rip, &sc->eip); | |
381 | eflags = regs->eflags; | |
382 | if (current->ptrace & PT_PTRACED) | |
383 | eflags &= ~TF_MASK; | |
384 | err |= __put_user((u32)eflags, &sc->eflags); | |
385 | err |= __put_user((u32)regs->rsp, &sc->esp_at_signal); | |
386 | ||
387 | tmp = save_i387_ia32(current, fpstate, regs, 0); | |
388 | if (tmp < 0) | |
389 | err = -EFAULT; | |
390 | else { | |
391 | clear_used_math(); | |
392 | stts(); | |
393 | err |= __put_user(ptr_to_compat(tmp ? fpstate : NULL), | |
394 | &sc->fpstate); | |
395 | } | |
396 | ||
397 | /* non-iBCS2 extensions.. */ | |
398 | err |= __put_user(mask, &sc->oldmask); | |
399 | err |= __put_user(current->thread.cr2, &sc->cr2); | |
400 | ||
401 | return err; | |
402 | } | |
403 | ||
404 | /* | |
405 | * Determine which stack to use.. | |
406 | */ | |
407 | static void __user * | |
408 | get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) | |
409 | { | |
410 | unsigned long rsp; | |
411 | ||
412 | /* Default to using normal stack */ | |
413 | rsp = regs->rsp; | |
414 | ||
415 | /* This is the X/Open sanctioned signal stack switching. */ | |
416 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
417 | if (sas_ss_flags(rsp) == 0) | |
418 | rsp = current->sas_ss_sp + current->sas_ss_size; | |
419 | } | |
420 | ||
421 | /* This is the legacy signal stack switching. */ | |
422 | else if ((regs->ss & 0xffff) != __USER_DS && | |
423 | !(ka->sa.sa_flags & SA_RESTORER) && | |
424 | ka->sa.sa_restorer) { | |
425 | rsp = (unsigned long) ka->sa.sa_restorer; | |
426 | } | |
427 | ||
428 | return (void __user *)((rsp - frame_size) & -8UL); | |
429 | } | |
430 | ||
431 | void ia32_setup_frame(int sig, struct k_sigaction *ka, | |
432 | compat_sigset_t *set, struct pt_regs * regs) | |
433 | { | |
434 | struct sigframe __user *frame; | |
435 | int err = 0; | |
436 | ||
437 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
438 | ||
439 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
440 | goto give_sigsegv; | |
441 | ||
442 | { | |
443 | struct exec_domain *ed = current_thread_info()->exec_domain; | |
444 | err |= __put_user((ed | |
445 | && ed->signal_invmap | |
446 | && sig < 32 | |
447 | ? ed->signal_invmap[sig] | |
448 | : sig), | |
449 | &frame->sig); | |
450 | } | |
451 | if (err) | |
452 | goto give_sigsegv; | |
453 | ||
454 | err |= ia32_setup_sigcontext(&frame->sc, &frame->fpstate, regs, | |
455 | set->sig[0]); | |
456 | if (err) | |
457 | goto give_sigsegv; | |
458 | ||
459 | if (_COMPAT_NSIG_WORDS > 1) { | |
460 | err |= __copy_to_user(frame->extramask, &set->sig[1], | |
461 | sizeof(frame->extramask)); | |
462 | } | |
463 | if (err) | |
464 | goto give_sigsegv; | |
465 | ||
466 | /* Return stub is in 32bit vsyscall page */ | |
467 | { | |
468 | void __user *restorer = VSYSCALL32_SIGRETURN; | |
469 | if (ka->sa.sa_flags & SA_RESTORER) | |
470 | restorer = ka->sa.sa_restorer; | |
471 | err |= __put_user(ptr_to_compat(restorer), &frame->pretcode); | |
472 | } | |
473 | /* These are actually not used anymore, but left because some | |
474 | gdb versions depend on them as a marker. */ | |
475 | { | |
476 | /* copy_to_user optimizes that into a single 8 byte store */ | |
477 | static const struct { | |
478 | u16 poplmovl; | |
479 | u32 val; | |
480 | u16 int80; | |
481 | u16 pad; | |
482 | } __attribute__((packed)) code = { | |
483 | 0xb858, /* popl %eax ; movl $...,%eax */ | |
484 | __NR_ia32_sigreturn, | |
485 | 0x80cd, /* int $0x80 */ | |
486 | 0, | |
487 | }; | |
488 | err |= __copy_to_user(frame->retcode, &code, 8); | |
489 | } | |
490 | if (err) | |
491 | goto give_sigsegv; | |
492 | ||
493 | /* Set up registers for signal handler */ | |
494 | regs->rsp = (unsigned long) frame; | |
495 | regs->rip = (unsigned long) ka->sa.sa_handler; | |
496 | ||
497 | asm volatile("movl %0,%%ds" :: "r" (__USER32_DS)); | |
498 | asm volatile("movl %0,%%es" :: "r" (__USER32_DS)); | |
499 | ||
500 | regs->cs = __USER32_CS; | |
501 | regs->ss = __USER32_DS; | |
502 | ||
503 | set_fs(USER_DS); | |
504 | if (regs->eflags & TF_MASK) { | |
505 | if (current->ptrace & PT_PTRACED) { | |
506 | ptrace_notify(SIGTRAP); | |
507 | } else { | |
508 | regs->eflags &= ~TF_MASK; | |
509 | } | |
510 | } | |
511 | ||
512 | #if DEBUG_SIG | |
513 | printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n", | |
514 | current->comm, current->pid, frame, regs->rip, frame->pretcode); | |
515 | #endif | |
516 | ||
517 | return; | |
518 | ||
519 | give_sigsegv: | |
520 | force_sigsegv(sig, current); | |
521 | } | |
522 | ||
523 | void ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, | |
524 | compat_sigset_t *set, struct pt_regs * regs) | |
525 | { | |
526 | struct rt_sigframe __user *frame; | |
527 | int err = 0; | |
528 | ||
529 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
530 | ||
531 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
532 | goto give_sigsegv; | |
533 | ||
534 | { | |
535 | struct exec_domain *ed = current_thread_info()->exec_domain; | |
536 | err |= __put_user((ed | |
537 | && ed->signal_invmap | |
538 | && sig < 32 | |
539 | ? ed->signal_invmap[sig] | |
540 | : sig), | |
541 | &frame->sig); | |
542 | } | |
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); | |
553 | err |= __put_user(sas_ss_flags(regs->rsp), | |
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, | |
557 | regs, set->sig[0]); | |
558 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
559 | if (err) | |
560 | goto give_sigsegv; | |
561 | ||
562 | ||
563 | { | |
564 | void __user *restorer = VSYSCALL32_RTSIGRETURN; | |
565 | if (ka->sa.sa_flags & SA_RESTORER) | |
566 | restorer = ka->sa.sa_restorer; | |
567 | err |= __put_user(ptr_to_compat(restorer), &frame->pretcode); | |
568 | } | |
569 | ||
570 | /* This is movl $,%eax ; int $0x80 */ | |
571 | /* Not actually used anymore, but left because some gdb versions | |
572 | need it. */ | |
573 | { | |
574 | /* __copy_to_user optimizes that into a single 8 byte store */ | |
575 | static const struct { | |
576 | u8 movl; | |
577 | u32 val; | |
578 | u16 int80; | |
579 | u16 pad; | |
580 | u8 pad2; | |
581 | } __attribute__((packed)) code = { | |
582 | 0xb8, | |
583 | __NR_ia32_rt_sigreturn, | |
584 | 0x80cd, | |
585 | 0, | |
586 | }; | |
587 | err |= __copy_to_user(frame->retcode, &code, 8); | |
588 | } | |
589 | if (err) | |
590 | goto give_sigsegv; | |
591 | ||
592 | /* Set up registers for signal handler */ | |
593 | regs->rsp = (unsigned long) frame; | |
594 | regs->rip = (unsigned long) ka->sa.sa_handler; | |
595 | ||
596 | asm volatile("movl %0,%%ds" :: "r" (__USER32_DS)); | |
597 | asm volatile("movl %0,%%es" :: "r" (__USER32_DS)); | |
598 | ||
599 | regs->cs = __USER32_CS; | |
600 | regs->ss = __USER32_DS; | |
601 | ||
602 | set_fs(USER_DS); | |
603 | if (regs->eflags & TF_MASK) { | |
604 | if (current->ptrace & PT_PTRACED) { | |
605 | ptrace_notify(SIGTRAP); | |
606 | } else { | |
607 | regs->eflags &= ~TF_MASK; | |
608 | } | |
609 | } | |
610 | ||
611 | #if DEBUG_SIG | |
612 | printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n", | |
613 | current->comm, current->pid, frame, regs->rip, frame->pretcode); | |
614 | #endif | |
615 | ||
616 | return; | |
617 | ||
618 | give_sigsegv: | |
619 | force_sigsegv(sig, current); | |
620 | } | |
621 |