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1da177e4 | 1 | /* |
1da177e4 | 2 | * Copyright (C) 1991, 1992 Linus Torvalds |
e5fa2d06 | 3 | * Copyright (C) 2000, 2001, 2002 Andi Kleen SuSE Labs |
1da177e4 LT |
4 | * |
5 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson | |
6 | * 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes | |
e5fa2d06 | 7 | * 2000-2002 x86-64 support by Andi Kleen |
1da177e4 LT |
8 | */ |
9 | ||
5c9b3a0c HS |
10 | #include <linux/sched.h> |
11 | #include <linux/mm.h> | |
12 | #include <linux/smp.h> | |
1da177e4 LT |
13 | #include <linux/kernel.h> |
14 | #include <linux/signal.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/wait.h> | |
5c9b3a0c | 17 | #include <linux/ptrace.h> |
36a03308 | 18 | #include <linux/tracehook.h> |
5c9b3a0c HS |
19 | #include <linux/unistd.h> |
20 | #include <linux/stddef.h> | |
21 | #include <linux/personality.h> | |
22 | #include <linux/uaccess.h> | |
7e907f48 | 23 | |
1da177e4 LT |
24 | #include <asm/processor.h> |
25 | #include <asm/ucontext.h> | |
1da177e4 | 26 | #include <asm/i387.h> |
6c3652ef | 27 | #include <asm/vdso.h> |
5c9b3a0c HS |
28 | |
29 | #ifdef CONFIG_X86_64 | |
30 | #include <asm/proto.h> | |
31 | #include <asm/ia32_unistd.h> | |
32 | #include <asm/mce.h> | |
33 | #endif /* CONFIG_X86_64 */ | |
34 | ||
bb57925f | 35 | #include <asm/syscall.h> |
bbc1f698 | 36 | #include <asm/syscalls.h> |
7e907f48 | 37 | |
41af86fa | 38 | #include <asm/sigframe.h> |
1da177e4 | 39 | |
1da177e4 LT |
40 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
41 | ||
1a176803 HH |
42 | #define __FIX_EFLAGS (X86_EFLAGS_AC | X86_EFLAGS_OF | \ |
43 | X86_EFLAGS_DF | X86_EFLAGS_TF | X86_EFLAGS_SF | \ | |
44 | X86_EFLAGS_ZF | X86_EFLAGS_AF | X86_EFLAGS_PF | \ | |
45 | X86_EFLAGS_CF) | |
46 | ||
47 | #ifdef CONFIG_X86_32 | |
48 | # define FIX_EFLAGS (__FIX_EFLAGS | X86_EFLAGS_RF) | |
49 | #else | |
50 | # define FIX_EFLAGS __FIX_EFLAGS | |
51 | #endif | |
52 | ||
2601657d HS |
53 | #define COPY(x) { \ |
54 | err |= __get_user(regs->x, &sc->x); \ | |
55 | } | |
56 | ||
57 | #define COPY_SEG(seg) { \ | |
58 | unsigned short tmp; \ | |
59 | err |= __get_user(tmp, &sc->seg); \ | |
60 | regs->seg = tmp; \ | |
61 | } | |
62 | ||
63 | #define COPY_SEG_CPL3(seg) { \ | |
64 | unsigned short tmp; \ | |
65 | err |= __get_user(tmp, &sc->seg); \ | |
66 | regs->seg = tmp | 3; \ | |
67 | } | |
68 | ||
69 | #define GET_SEG(seg) { \ | |
70 | unsigned short tmp; \ | |
71 | err |= __get_user(tmp, &sc->seg); \ | |
72 | loadsegment(seg, tmp); \ | |
73 | } | |
74 | ||
75 | static int | |
76 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, | |
77 | unsigned long *pax) | |
78 | { | |
79 | void __user *buf; | |
80 | unsigned int tmpflags; | |
81 | unsigned int err = 0; | |
82 | ||
83 | /* Always make any pending restarted system calls return -EINTR */ | |
84 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
85 | ||
86 | #ifdef CONFIG_X86_32 | |
87 | GET_SEG(gs); | |
88 | COPY_SEG(fs); | |
89 | COPY_SEG(es); | |
90 | COPY_SEG(ds); | |
91 | #endif /* CONFIG_X86_32 */ | |
92 | ||
93 | COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx); | |
94 | COPY(dx); COPY(cx); COPY(ip); | |
95 | ||
96 | #ifdef CONFIG_X86_64 | |
97 | COPY(r8); | |
98 | COPY(r9); | |
99 | COPY(r10); | |
100 | COPY(r11); | |
101 | COPY(r12); | |
102 | COPY(r13); | |
103 | COPY(r14); | |
104 | COPY(r15); | |
105 | #endif /* CONFIG_X86_64 */ | |
106 | ||
107 | #ifdef CONFIG_X86_32 | |
108 | COPY_SEG_CPL3(cs); | |
109 | COPY_SEG_CPL3(ss); | |
110 | #else /* !CONFIG_X86_32 */ | |
111 | /* Kernel saves and restores only the CS segment register on signals, | |
112 | * which is the bare minimum needed to allow mixed 32/64-bit code. | |
113 | * App's signal handler can save/restore other segments if needed. */ | |
114 | COPY_SEG_CPL3(cs); | |
115 | #endif /* CONFIG_X86_32 */ | |
116 | ||
117 | err |= __get_user(tmpflags, &sc->flags); | |
118 | regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS); | |
119 | regs->orig_ax = -1; /* disable syscall checks */ | |
120 | ||
121 | err |= __get_user(buf, &sc->fpstate); | |
122 | err |= restore_i387_xstate(buf); | |
123 | ||
124 | err |= __get_user(*pax, &sc->ax); | |
125 | return err; | |
126 | } | |
127 | ||
128 | static int | |
129 | setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate, | |
130 | struct pt_regs *regs, unsigned long mask) | |
131 | { | |
132 | int err = 0; | |
133 | ||
134 | #ifdef CONFIG_X86_32 | |
135 | { | |
136 | unsigned int tmp; | |
137 | ||
138 | savesegment(gs, tmp); | |
139 | err |= __put_user(tmp, (unsigned int __user *)&sc->gs); | |
140 | } | |
141 | err |= __put_user(regs->fs, (unsigned int __user *)&sc->fs); | |
142 | err |= __put_user(regs->es, (unsigned int __user *)&sc->es); | |
143 | err |= __put_user(regs->ds, (unsigned int __user *)&sc->ds); | |
144 | #endif /* CONFIG_X86_32 */ | |
145 | ||
146 | err |= __put_user(regs->di, &sc->di); | |
147 | err |= __put_user(regs->si, &sc->si); | |
148 | err |= __put_user(regs->bp, &sc->bp); | |
149 | err |= __put_user(regs->sp, &sc->sp); | |
150 | err |= __put_user(regs->bx, &sc->bx); | |
151 | err |= __put_user(regs->dx, &sc->dx); | |
152 | err |= __put_user(regs->cx, &sc->cx); | |
153 | err |= __put_user(regs->ax, &sc->ax); | |
154 | #ifdef CONFIG_X86_64 | |
155 | err |= __put_user(regs->r8, &sc->r8); | |
156 | err |= __put_user(regs->r9, &sc->r9); | |
157 | err |= __put_user(regs->r10, &sc->r10); | |
158 | err |= __put_user(regs->r11, &sc->r11); | |
159 | err |= __put_user(regs->r12, &sc->r12); | |
160 | err |= __put_user(regs->r13, &sc->r13); | |
161 | err |= __put_user(regs->r14, &sc->r14); | |
162 | err |= __put_user(regs->r15, &sc->r15); | |
163 | #endif /* CONFIG_X86_64 */ | |
164 | ||
165 | err |= __put_user(current->thread.trap_no, &sc->trapno); | |
166 | err |= __put_user(current->thread.error_code, &sc->err); | |
167 | err |= __put_user(regs->ip, &sc->ip); | |
168 | #ifdef CONFIG_X86_32 | |
169 | err |= __put_user(regs->cs, (unsigned int __user *)&sc->cs); | |
170 | err |= __put_user(regs->flags, &sc->flags); | |
171 | err |= __put_user(regs->sp, &sc->sp_at_signal); | |
172 | err |= __put_user(regs->ss, (unsigned int __user *)&sc->ss); | |
173 | #else /* !CONFIG_X86_32 */ | |
174 | err |= __put_user(regs->flags, &sc->flags); | |
175 | err |= __put_user(regs->cs, &sc->cs); | |
176 | err |= __put_user(0, &sc->gs); | |
177 | err |= __put_user(0, &sc->fs); | |
178 | #endif /* CONFIG_X86_32 */ | |
179 | ||
180 | err |= __put_user(fpstate, &sc->fpstate); | |
181 | ||
182 | /* non-iBCS2 extensions.. */ | |
183 | err |= __put_user(mask, &sc->oldmask); | |
184 | err |= __put_user(current->thread.cr2, &sc->cr2); | |
185 | ||
186 | return err; | |
187 | } | |
188 | ||
1da177e4 | 189 | /* |
bfeb91a9 | 190 | * Set up a signal frame. |
1da177e4 | 191 | */ |
2456d738 | 192 | #ifdef CONFIG_X86_32 |
bfeb91a9 HS |
193 | static const struct { |
194 | u16 poplmovl; | |
195 | u32 val; | |
196 | u16 int80; | |
197 | } __attribute__((packed)) retcode = { | |
198 | 0xb858, /* popl %eax; movl $..., %eax */ | |
199 | __NR_sigreturn, | |
200 | 0x80cd, /* int $0x80 */ | |
201 | }; | |
e6babb6b | 202 | |
bfeb91a9 HS |
203 | static const struct { |
204 | u8 movl; | |
205 | u32 val; | |
206 | u16 int80; | |
207 | u8 pad; | |
208 | } __attribute__((packed)) rt_retcode = { | |
209 | 0xb8, /* movl $..., %eax */ | |
210 | __NR_rt_sigreturn, | |
211 | 0x80cd, /* int $0x80 */ | |
212 | 0 | |
213 | }; | |
1da177e4 LT |
214 | |
215 | /* | |
216 | * Determine which stack to use.. | |
217 | */ | |
218 | static inline void __user * | |
3c1c7f10 | 219 | get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size, |
ab513701 | 220 | void **fpstate) |
1da177e4 | 221 | { |
65ea5b03 | 222 | unsigned long sp; |
1da177e4 LT |
223 | |
224 | /* Default to using normal stack */ | |
65ea5b03 | 225 | sp = regs->sp; |
1da177e4 | 226 | |
83bd0102 RM |
227 | /* |
228 | * If we are on the alternate signal stack and would overflow it, don't. | |
229 | * Return an always-bogus address instead so we will die with SIGSEGV. | |
230 | */ | |
65ea5b03 | 231 | if (on_sig_stack(sp) && !likely(on_sig_stack(sp - frame_size))) |
83bd0102 RM |
232 | return (void __user *) -1L; |
233 | ||
1da177e4 LT |
234 | /* This is the X/Open sanctioned signal stack switching. */ |
235 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
65ea5b03 PA |
236 | if (sas_ss_flags(sp) == 0) |
237 | sp = current->sas_ss_sp + current->sas_ss_size; | |
7e907f48 IM |
238 | } else { |
239 | /* This is the legacy signal stack switching. */ | |
240 | if ((regs->ss & 0xffff) != __USER_DS && | |
241 | !(ka->sa.sa_flags & SA_RESTORER) && | |
242 | ka->sa.sa_restorer) | |
243 | sp = (unsigned long) ka->sa.sa_restorer; | |
1da177e4 LT |
244 | } |
245 | ||
3c1c7f10 SS |
246 | if (used_math()) { |
247 | sp = sp - sig_xstate_size; | |
248 | *fpstate = (struct _fpstate *) sp; | |
4b33669e HS |
249 | if (save_i387_xstate(*fpstate) < 0) |
250 | return (void __user *)-1L; | |
3c1c7f10 SS |
251 | } |
252 | ||
65ea5b03 | 253 | sp -= frame_size; |
7e907f48 IM |
254 | /* |
255 | * Align the stack pointer according to the i386 ABI, | |
256 | * i.e. so that on function entry ((sp + 4) & 15) == 0. | |
257 | */ | |
65ea5b03 | 258 | sp = ((sp + 4) & -16ul) - 4; |
7e907f48 | 259 | |
65ea5b03 | 260 | return (void __user *) sp; |
1da177e4 LT |
261 | } |
262 | ||
7e907f48 | 263 | static int |
1d13024e HS |
264 | __setup_frame(int sig, struct k_sigaction *ka, sigset_t *set, |
265 | struct pt_regs *regs) | |
1da177e4 | 266 | { |
1da177e4 | 267 | struct sigframe __user *frame; |
7e907f48 | 268 | void __user *restorer; |
1da177e4 | 269 | int err = 0; |
ab513701 | 270 | void __user *fpstate = NULL; |
1da177e4 | 271 | |
3c1c7f10 | 272 | frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate); |
1da177e4 LT |
273 | |
274 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
3d0aedd9 | 275 | return -EFAULT; |
1da177e4 | 276 | |
2ba48e16 | 277 | if (__put_user(sig, &frame->sig)) |
3d0aedd9 | 278 | return -EFAULT; |
1da177e4 | 279 | |
2ba48e16 | 280 | if (setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0])) |
3d0aedd9 | 281 | return -EFAULT; |
1da177e4 LT |
282 | |
283 | if (_NSIG_WORDS > 1) { | |
2ba48e16 HS |
284 | if (__copy_to_user(&frame->extramask, &set->sig[1], |
285 | sizeof(frame->extramask))) | |
3d0aedd9 | 286 | return -EFAULT; |
1da177e4 LT |
287 | } |
288 | ||
1a3e4ca4 | 289 | if (current->mm->context.vdso) |
6c3652ef | 290 | restorer = VDSO32_SYMBOL(current->mm->context.vdso, sigreturn); |
9fbbd4dd | 291 | else |
ade1af77 | 292 | restorer = &frame->retcode; |
1da177e4 LT |
293 | if (ka->sa.sa_flags & SA_RESTORER) |
294 | restorer = ka->sa.sa_restorer; | |
295 | ||
296 | /* Set up to return from userspace. */ | |
297 | err |= __put_user(restorer, &frame->pretcode); | |
7e907f48 | 298 | |
1da177e4 | 299 | /* |
7e907f48 | 300 | * This is popl %eax ; movl $__NR_sigreturn, %eax ; int $0x80 |
1da177e4 LT |
301 | * |
302 | * WE DO NOT USE IT ANY MORE! It's only left here for historical | |
303 | * reasons and because gdb uses it as a signature to notice | |
304 | * signal handler stack frames. | |
305 | */ | |
4a612048 | 306 | err |= __put_user(*((u64 *)&retcode), (u64 *)frame->retcode); |
1da177e4 LT |
307 | |
308 | if (err) | |
3d0aedd9 | 309 | return -EFAULT; |
1da177e4 LT |
310 | |
311 | /* Set up registers for signal handler */ | |
7e907f48 IM |
312 | regs->sp = (unsigned long)frame; |
313 | regs->ip = (unsigned long)ka->sa.sa_handler; | |
314 | regs->ax = (unsigned long)sig; | |
92bc2056 HH |
315 | regs->dx = 0; |
316 | regs->cx = 0; | |
1da177e4 | 317 | |
65ea5b03 PA |
318 | regs->ds = __USER_DS; |
319 | regs->es = __USER_DS; | |
320 | regs->ss = __USER_DS; | |
321 | regs->cs = __USER_CS; | |
1da177e4 | 322 | |
283828f3 | 323 | return 0; |
1da177e4 LT |
324 | } |
325 | ||
1d13024e HS |
326 | static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
327 | sigset_t *set, struct pt_regs *regs) | |
1da177e4 | 328 | { |
1da177e4 | 329 | struct rt_sigframe __user *frame; |
7e907f48 | 330 | void __user *restorer; |
1da177e4 | 331 | int err = 0; |
ab513701 | 332 | void __user *fpstate = NULL; |
1da177e4 | 333 | |
3c1c7f10 | 334 | frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate); |
1da177e4 LT |
335 | |
336 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
3d0aedd9 | 337 | return -EFAULT; |
1da177e4 | 338 | |
13ad7725 | 339 | err |= __put_user(sig, &frame->sig); |
1da177e4 LT |
340 | err |= __put_user(&frame->info, &frame->pinfo); |
341 | err |= __put_user(&frame->uc, &frame->puc); | |
342 | err |= copy_siginfo_to_user(&frame->info, info); | |
343 | if (err) | |
3d0aedd9 | 344 | return -EFAULT; |
1da177e4 LT |
345 | |
346 | /* Create the ucontext. */ | |
c37b5efe SS |
347 | if (cpu_has_xsave) |
348 | err |= __put_user(UC_FP_XSTATE, &frame->uc.uc_flags); | |
349 | else | |
350 | err |= __put_user(0, &frame->uc.uc_flags); | |
1da177e4 LT |
351 | err |= __put_user(0, &frame->uc.uc_link); |
352 | err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
65ea5b03 | 353 | err |= __put_user(sas_ss_flags(regs->sp), |
1da177e4 LT |
354 | &frame->uc.uc_stack.ss_flags); |
355 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
3c1c7f10 | 356 | err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate, |
7e907f48 | 357 | regs, set->sig[0]); |
1da177e4 LT |
358 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
359 | if (err) | |
3d0aedd9 | 360 | return -EFAULT; |
1da177e4 LT |
361 | |
362 | /* Set up to return from userspace. */ | |
6c3652ef | 363 | restorer = VDSO32_SYMBOL(current->mm->context.vdso, rt_sigreturn); |
1da177e4 LT |
364 | if (ka->sa.sa_flags & SA_RESTORER) |
365 | restorer = ka->sa.sa_restorer; | |
366 | err |= __put_user(restorer, &frame->pretcode); | |
7e907f48 | 367 | |
1da177e4 | 368 | /* |
7e907f48 | 369 | * This is movl $__NR_rt_sigreturn, %ax ; int $0x80 |
1da177e4 LT |
370 | * |
371 | * WE DO NOT USE IT ANY MORE! It's only left here for historical | |
372 | * reasons and because gdb uses it as a signature to notice | |
373 | * signal handler stack frames. | |
374 | */ | |
4a612048 | 375 | err |= __put_user(*((u64 *)&rt_retcode), (u64 *)frame->retcode); |
1da177e4 LT |
376 | |
377 | if (err) | |
3d0aedd9 | 378 | return -EFAULT; |
1da177e4 LT |
379 | |
380 | /* Set up registers for signal handler */ | |
7e907f48 IM |
381 | regs->sp = (unsigned long)frame; |
382 | regs->ip = (unsigned long)ka->sa.sa_handler; | |
13ad7725 | 383 | regs->ax = (unsigned long)sig; |
7e907f48 IM |
384 | regs->dx = (unsigned long)&frame->info; |
385 | regs->cx = (unsigned long)&frame->uc; | |
1da177e4 | 386 | |
65ea5b03 PA |
387 | regs->ds = __USER_DS; |
388 | regs->es = __USER_DS; | |
389 | regs->ss = __USER_DS; | |
390 | regs->cs = __USER_CS; | |
1da177e4 | 391 | |
283828f3 | 392 | return 0; |
1da177e4 | 393 | } |
bfeb91a9 HS |
394 | #else /* !CONFIG_X86_32 */ |
395 | /* | |
396 | * Determine which stack to use.. | |
397 | */ | |
398 | static void __user * | |
399 | get_stack(struct k_sigaction *ka, unsigned long sp, unsigned long size) | |
400 | { | |
401 | /* Default to using normal stack - redzone*/ | |
402 | sp -= 128; | |
403 | ||
404 | /* This is the X/Open sanctioned signal stack switching. */ | |
405 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
406 | if (sas_ss_flags(sp) == 0) | |
407 | sp = current->sas_ss_sp + current->sas_ss_size; | |
408 | } | |
409 | ||
410 | return (void __user *)round_down(sp - size, 64); | |
411 | } | |
412 | ||
413 | static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, | |
414 | sigset_t *set, struct pt_regs *regs) | |
415 | { | |
416 | struct rt_sigframe __user *frame; | |
417 | void __user *fp = NULL; | |
418 | int err = 0; | |
419 | struct task_struct *me = current; | |
420 | ||
421 | if (used_math()) { | |
422 | fp = get_stack(ka, regs->sp, sig_xstate_size); | |
423 | frame = (void __user *)round_down( | |
424 | (unsigned long)fp - sizeof(struct rt_sigframe), 16) - 8; | |
425 | ||
426 | if (save_i387_xstate(fp) < 0) | |
427 | return -EFAULT; | |
428 | } else | |
429 | frame = get_stack(ka, regs->sp, sizeof(struct rt_sigframe)) - 8; | |
430 | ||
431 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
432 | return -EFAULT; | |
433 | ||
434 | if (ka->sa.sa_flags & SA_SIGINFO) { | |
435 | if (copy_siginfo_to_user(&frame->info, info)) | |
436 | return -EFAULT; | |
437 | } | |
438 | ||
439 | /* Create the ucontext. */ | |
440 | if (cpu_has_xsave) | |
441 | err |= __put_user(UC_FP_XSTATE, &frame->uc.uc_flags); | |
442 | else | |
443 | err |= __put_user(0, &frame->uc.uc_flags); | |
444 | err |= __put_user(0, &frame->uc.uc_link); | |
445 | err |= __put_user(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
446 | err |= __put_user(sas_ss_flags(regs->sp), | |
447 | &frame->uc.uc_stack.ss_flags); | |
448 | err |= __put_user(me->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
449 | err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]); | |
450 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
451 | ||
452 | /* Set up to return from userspace. If provided, use a stub | |
453 | already in userspace. */ | |
454 | /* x86-64 should always use SA_RESTORER. */ | |
455 | if (ka->sa.sa_flags & SA_RESTORER) { | |
456 | err |= __put_user(ka->sa.sa_restorer, &frame->pretcode); | |
457 | } else { | |
458 | /* could use a vstub here */ | |
459 | return -EFAULT; | |
460 | } | |
461 | ||
462 | if (err) | |
463 | return -EFAULT; | |
464 | ||
465 | /* Set up registers for signal handler */ | |
466 | regs->di = sig; | |
467 | /* In case the signal handler was declared without prototypes */ | |
468 | regs->ax = 0; | |
469 | ||
470 | /* This also works for non SA_SIGINFO handlers because they expect the | |
471 | next argument after the signal number on the stack. */ | |
472 | regs->si = (unsigned long)&frame->info; | |
473 | regs->dx = (unsigned long)&frame->uc; | |
474 | regs->ip = (unsigned long) ka->sa.sa_handler; | |
475 | ||
476 | regs->sp = (unsigned long)frame; | |
477 | ||
478 | /* Set up the CS register to run signal handlers in 64-bit mode, | |
479 | even if the handler happens to be interrupting 32-bit code. */ | |
480 | regs->cs = __USER_CS; | |
481 | ||
482 | return 0; | |
483 | } | |
484 | #endif /* CONFIG_X86_32 */ | |
485 | ||
e5fa2d06 | 486 | #ifdef CONFIG_X86_32 |
bfeb91a9 HS |
487 | /* |
488 | * Atomically swap in the new signal mask, and wait for a signal. | |
489 | */ | |
490 | asmlinkage int | |
491 | sys_sigsuspend(int history0, int history1, old_sigset_t mask) | |
492 | { | |
493 | mask &= _BLOCKABLE; | |
494 | spin_lock_irq(¤t->sighand->siglock); | |
495 | current->saved_sigmask = current->blocked; | |
496 | siginitset(¤t->blocked, mask); | |
497 | recalc_sigpending(); | |
498 | spin_unlock_irq(¤t->sighand->siglock); | |
499 | ||
500 | current->state = TASK_INTERRUPTIBLE; | |
501 | schedule(); | |
502 | set_restore_sigmask(); | |
503 | ||
504 | return -ERESTARTNOHAND; | |
505 | } | |
506 | ||
507 | asmlinkage int | |
508 | sys_sigaction(int sig, const struct old_sigaction __user *act, | |
509 | struct old_sigaction __user *oact) | |
510 | { | |
511 | struct k_sigaction new_ka, old_ka; | |
512 | int ret; | |
513 | ||
514 | if (act) { | |
515 | old_sigset_t mask; | |
516 | ||
517 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || | |
518 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || | |
519 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) | |
520 | return -EFAULT; | |
521 | ||
522 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
523 | __get_user(mask, &act->sa_mask); | |
524 | siginitset(&new_ka.sa.sa_mask, mask); | |
525 | } | |
526 | ||
527 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
528 | ||
529 | if (!ret && oact) { | |
530 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || | |
531 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || | |
532 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) | |
533 | return -EFAULT; | |
534 | ||
535 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); | |
536 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); | |
537 | } | |
538 | ||
539 | return ret; | |
540 | } | |
e5fa2d06 | 541 | #endif /* CONFIG_X86_32 */ |
bfeb91a9 HS |
542 | |
543 | #ifdef CONFIG_X86_32 | |
544 | asmlinkage int sys_sigaltstack(unsigned long bx) | |
545 | { | |
546 | /* | |
547 | * This is needed to make gcc realize it doesn't own the | |
548 | * "struct pt_regs" | |
549 | */ | |
550 | struct pt_regs *regs = (struct pt_regs *)&bx; | |
551 | const stack_t __user *uss = (const stack_t __user *)bx; | |
552 | stack_t __user *uoss = (stack_t __user *)regs->cx; | |
553 | ||
554 | return do_sigaltstack(uss, uoss, regs->sp); | |
555 | } | |
556 | #else /* !CONFIG_X86_32 */ | |
557 | asmlinkage long | |
558 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, | |
559 | struct pt_regs *regs) | |
560 | { | |
561 | return do_sigaltstack(uss, uoss, regs->sp); | |
562 | } | |
563 | #endif /* CONFIG_X86_32 */ | |
564 | ||
565 | /* | |
566 | * Do a signal return; undo the signal stack. | |
567 | */ | |
e5fa2d06 | 568 | #ifdef CONFIG_X86_32 |
bfeb91a9 HS |
569 | asmlinkage unsigned long sys_sigreturn(unsigned long __unused) |
570 | { | |
571 | struct sigframe __user *frame; | |
572 | struct pt_regs *regs; | |
573 | unsigned long ax; | |
574 | sigset_t set; | |
575 | ||
576 | regs = (struct pt_regs *) &__unused; | |
577 | frame = (struct sigframe __user *)(regs->sp - 8); | |
578 | ||
579 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
580 | goto badframe; | |
581 | if (__get_user(set.sig[0], &frame->sc.oldmask) || (_NSIG_WORDS > 1 | |
582 | && __copy_from_user(&set.sig[1], &frame->extramask, | |
583 | sizeof(frame->extramask)))) | |
584 | goto badframe; | |
585 | ||
586 | sigdelsetmask(&set, ~_BLOCKABLE); | |
587 | spin_lock_irq(¤t->sighand->siglock); | |
588 | current->blocked = set; | |
589 | recalc_sigpending(); | |
590 | spin_unlock_irq(¤t->sighand->siglock); | |
591 | ||
592 | if (restore_sigcontext(regs, &frame->sc, &ax)) | |
593 | goto badframe; | |
594 | return ax; | |
595 | ||
596 | badframe: | |
ae417bb4 | 597 | signal_fault(regs, frame, "sigreturn"); |
bfeb91a9 HS |
598 | |
599 | return 0; | |
600 | } | |
e5fa2d06 | 601 | #endif /* CONFIG_X86_32 */ |
bfeb91a9 HS |
602 | |
603 | static long do_rt_sigreturn(struct pt_regs *regs) | |
604 | { | |
605 | struct rt_sigframe __user *frame; | |
606 | unsigned long ax; | |
607 | sigset_t set; | |
608 | ||
609 | frame = (struct rt_sigframe __user *)(regs->sp - sizeof(long)); | |
610 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
611 | goto badframe; | |
612 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
613 | goto badframe; | |
614 | ||
615 | sigdelsetmask(&set, ~_BLOCKABLE); | |
616 | spin_lock_irq(¤t->sighand->siglock); | |
617 | current->blocked = set; | |
618 | recalc_sigpending(); | |
619 | spin_unlock_irq(¤t->sighand->siglock); | |
620 | ||
621 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax)) | |
622 | goto badframe; | |
623 | ||
624 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT) | |
625 | goto badframe; | |
626 | ||
627 | return ax; | |
628 | ||
629 | badframe: | |
630 | signal_fault(regs, frame, "rt_sigreturn"); | |
631 | return 0; | |
632 | } | |
633 | ||
634 | #ifdef CONFIG_X86_32 | |
4217458d | 635 | asmlinkage int sys_rt_sigreturn(struct pt_regs regs) |
bfeb91a9 | 636 | { |
4217458d | 637 | return do_rt_sigreturn(®s); |
bfeb91a9 HS |
638 | } |
639 | #else /* !CONFIG_X86_32 */ | |
640 | asmlinkage long sys_rt_sigreturn(struct pt_regs *regs) | |
641 | { | |
642 | return do_rt_sigreturn(regs); | |
643 | } | |
644 | #endif /* CONFIG_X86_32 */ | |
1da177e4 LT |
645 | |
646 | /* | |
7e907f48 IM |
647 | * OK, we're invoking a handler: |
648 | */ | |
8d8c13bd HS |
649 | static int signr_convert(int sig) |
650 | { | |
96bf84b7 | 651 | #ifdef CONFIG_X86_32 |
8d8c13bd HS |
652 | struct thread_info *info = current_thread_info(); |
653 | ||
654 | if (info->exec_domain && info->exec_domain->signal_invmap && sig < 32) | |
655 | return info->exec_domain->signal_invmap[sig]; | |
96bf84b7 | 656 | #endif /* CONFIG_X86_32 */ |
8d8c13bd HS |
657 | return sig; |
658 | } | |
659 | ||
cabf5035 HS |
660 | #ifdef CONFIG_X86_32 |
661 | ||
455edbc4 | 662 | #define is_ia32 1 |
4694d239 HS |
663 | #define ia32_setup_frame __setup_frame |
664 | #define ia32_setup_rt_frame __setup_rt_frame | |
455edbc4 | 665 | |
cabf5035 HS |
666 | #else /* !CONFIG_X86_32 */ |
667 | ||
668 | #ifdef CONFIG_IA32_EMULATION | |
669 | #define is_ia32 test_thread_flag(TIF_IA32) | |
670 | #else /* !CONFIG_IA32_EMULATION */ | |
671 | #define is_ia32 0 | |
672 | #endif /* CONFIG_IA32_EMULATION */ | |
673 | ||
f5223763 HS |
674 | int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
675 | sigset_t *set, struct pt_regs *regs); | |
676 | int ia32_setup_frame(int sig, struct k_sigaction *ka, | |
677 | sigset_t *set, struct pt_regs *regs); | |
678 | ||
cabf5035 HS |
679 | #endif /* CONFIG_X86_32 */ |
680 | ||
1d13024e HS |
681 | static int |
682 | setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, | |
683 | sigset_t *set, struct pt_regs *regs) | |
684 | { | |
8d8c13bd | 685 | int usig = signr_convert(sig); |
1d13024e HS |
686 | int ret; |
687 | ||
688 | /* Set up the stack frame */ | |
455edbc4 HS |
689 | if (is_ia32) { |
690 | if (ka->sa.sa_flags & SA_SIGINFO) | |
4694d239 | 691 | ret = ia32_setup_rt_frame(usig, ka, info, set, regs); |
455edbc4 | 692 | else |
4694d239 | 693 | ret = ia32_setup_frame(usig, ka, set, regs); |
455edbc4 HS |
694 | } else |
695 | ret = __setup_rt_frame(sig, ka, info, set, regs); | |
1d13024e | 696 | |
3d0aedd9 HS |
697 | if (ret) { |
698 | force_sigsegv(sig, current); | |
699 | return -EFAULT; | |
700 | } | |
701 | ||
1d13024e HS |
702 | return ret; |
703 | } | |
704 | ||
7c1def16 | 705 | static int |
1da177e4 | 706 | handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, |
ac66f3fd | 707 | sigset_t *oldset, struct pt_regs *regs) |
1da177e4 | 708 | { |
7c1def16 RM |
709 | int ret; |
710 | ||
1da177e4 | 711 | /* Are we from a system call? */ |
bb57925f | 712 | if (syscall_get_nr(current, regs) >= 0) { |
1da177e4 | 713 | /* If so, check system call restarting.. */ |
bb57925f | 714 | switch (syscall_get_error(current, regs)) { |
ac66f3fd HH |
715 | case -ERESTART_RESTARTBLOCK: |
716 | case -ERESTARTNOHAND: | |
717 | regs->ax = -EINTR; | |
718 | break; | |
719 | ||
720 | case -ERESTARTSYS: | |
721 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
65ea5b03 | 722 | regs->ax = -EINTR; |
1da177e4 | 723 | break; |
ac66f3fd HH |
724 | } |
725 | /* fallthrough */ | |
726 | case -ERESTARTNOINTR: | |
727 | regs->ax = regs->orig_ax; | |
728 | regs->ip -= 2; | |
729 | break; | |
1da177e4 LT |
730 | } |
731 | } | |
732 | ||
733 | /* | |
e1f28773 RM |
734 | * If TF is set due to a debugger (TIF_FORCED_TF), clear the TF |
735 | * flag so that register information in the sigcontext is correct. | |
1da177e4 | 736 | */ |
65ea5b03 | 737 | if (unlikely(regs->flags & X86_EFLAGS_TF) && |
e1f28773 | 738 | likely(test_and_clear_thread_flag(TIF_FORCED_TF))) |
65ea5b03 | 739 | regs->flags &= ~X86_EFLAGS_TF; |
1da177e4 | 740 | |
1d13024e | 741 | ret = setup_rt_frame(sig, ka, info, oldset, regs); |
1da177e4 | 742 | |
7e907f48 IM |
743 | if (ret) |
744 | return ret; | |
7c1def16 | 745 | |
86d3237c HS |
746 | #ifdef CONFIG_X86_64 |
747 | /* | |
748 | * This has nothing to do with segment registers, | |
749 | * despite the name. This magic affects uaccess.h | |
750 | * macros' behavior. Reset it to the normal setting. | |
751 | */ | |
752 | set_fs(USER_DS); | |
753 | #endif | |
754 | ||
8b9c5ff3 RM |
755 | /* |
756 | * Clear the direction flag as per the ABI for function entry. | |
757 | */ | |
758 | regs->flags &= ~X86_EFLAGS_DF; | |
759 | ||
760 | /* | |
761 | * Clear TF when entering the signal handler, but | |
762 | * notify any tracer that was single-stepping it. | |
763 | * The tracer may want to single-step inside the | |
764 | * handler too. | |
765 | */ | |
766 | regs->flags &= ~X86_EFLAGS_TF; | |
8b9c5ff3 | 767 | |
7e907f48 IM |
768 | spin_lock_irq(¤t->sighand->siglock); |
769 | sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask); | |
770 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
771 | sigaddset(¤t->blocked, sig); | |
772 | recalc_sigpending(); | |
773 | spin_unlock_irq(¤t->sighand->siglock); | |
774 | ||
36a03308 RM |
775 | tracehook_signal_handler(sig, info, ka, regs, |
776 | test_thread_flag(TIF_SINGLESTEP)); | |
777 | ||
7e907f48 | 778 | return 0; |
1da177e4 LT |
779 | } |
780 | ||
57917752 | 781 | #ifdef CONFIG_X86_32 |
8fcd8e20 | 782 | #define NR_restart_syscall __NR_restart_syscall |
57917752 HS |
783 | #else /* !CONFIG_X86_32 */ |
784 | #define NR_restart_syscall \ | |
785 | test_thread_flag(TIF_IA32) ? __NR_ia32_restart_syscall : __NR_restart_syscall | |
786 | #endif /* CONFIG_X86_32 */ | |
787 | ||
1da177e4 LT |
788 | /* |
789 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
790 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
791 | * mistake. | |
792 | */ | |
75604d7f | 793 | static void do_signal(struct pt_regs *regs) |
1da177e4 | 794 | { |
ac66f3fd | 795 | struct k_sigaction ka; |
1da177e4 LT |
796 | siginfo_t info; |
797 | int signr; | |
283828f3 | 798 | sigset_t *oldset; |
1da177e4 LT |
799 | |
800 | /* | |
ac66f3fd HH |
801 | * We want the common case to go fast, which is why we may in certain |
802 | * cases get here from kernel mode. Just return without doing anything | |
803 | * if so. | |
804 | * X86_32: vm86 regs switched out by assembly code before reaching | |
805 | * here, so testing against kernel CS suffices. | |
1da177e4 | 806 | */ |
717b594a | 807 | if (!user_mode(regs)) |
283828f3 | 808 | return; |
1da177e4 | 809 | |
5a8da0ea | 810 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) |
283828f3 DH |
811 | oldset = ¤t->saved_sigmask; |
812 | else | |
1da177e4 LT |
813 | oldset = ¤t->blocked; |
814 | ||
815 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
816 | if (signr > 0) { | |
7e907f48 IM |
817 | /* |
818 | * Re-enable any watchpoints before delivering the | |
1da177e4 LT |
819 | * signal to user space. The processor register will |
820 | * have been cleared if the watchpoint triggered | |
821 | * inside the kernel. | |
822 | */ | |
ac66f3fd | 823 | if (current->thread.debugreg7) |
0f534093 | 824 | set_debugreg(current->thread.debugreg7, 7); |
1da177e4 | 825 | |
7e907f48 | 826 | /* Whee! Actually deliver the signal. */ |
283828f3 | 827 | if (handle_signal(signr, &info, &ka, oldset, regs) == 0) { |
7e907f48 | 828 | /* |
5a8da0ea | 829 | * A signal was successfully delivered; the saved |
283828f3 DH |
830 | * sigmask will have been stored in the signal frame, |
831 | * and will be restored by sigreturn, so we can simply | |
5a8da0ea | 832 | * clear the TS_RESTORE_SIGMASK flag. |
7e907f48 | 833 | */ |
5a8da0ea | 834 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; |
283828f3 | 835 | } |
283828f3 | 836 | return; |
1da177e4 LT |
837 | } |
838 | ||
1da177e4 | 839 | /* Did we come from a system call? */ |
bb57925f | 840 | if (syscall_get_nr(current, regs) >= 0) { |
1da177e4 | 841 | /* Restart the system call - no handlers present */ |
bb57925f | 842 | switch (syscall_get_error(current, regs)) { |
283828f3 DH |
843 | case -ERESTARTNOHAND: |
844 | case -ERESTARTSYS: | |
845 | case -ERESTARTNOINTR: | |
65ea5b03 PA |
846 | regs->ax = regs->orig_ax; |
847 | regs->ip -= 2; | |
283828f3 DH |
848 | break; |
849 | ||
850 | case -ERESTART_RESTARTBLOCK: | |
8fcd8e20 | 851 | regs->ax = NR_restart_syscall; |
65ea5b03 | 852 | regs->ip -= 2; |
283828f3 | 853 | break; |
1da177e4 LT |
854 | } |
855 | } | |
283828f3 | 856 | |
ac66f3fd HH |
857 | /* |
858 | * If there's no signal to deliver, we just put the saved sigmask | |
859 | * back. | |
860 | */ | |
5a8da0ea RM |
861 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) { |
862 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; | |
283828f3 DH |
863 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); |
864 | } | |
1da177e4 LT |
865 | } |
866 | ||
867 | /* | |
868 | * notification of userspace execution resumption | |
283828f3 | 869 | * - triggered by the TIF_WORK_MASK flags |
1da177e4 | 870 | */ |
7e907f48 IM |
871 | void |
872 | do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags) | |
1da177e4 | 873 | { |
ee847c54 HS |
874 | #if defined(CONFIG_X86_64) && defined(CONFIG_X86_MCE) |
875 | /* notify userspace of pending MCEs */ | |
876 | if (thread_info_flags & _TIF_MCE_NOTIFY) | |
877 | mce_notify_user(); | |
878 | #endif /* CONFIG_X86_64 && CONFIG_X86_MCE */ | |
879 | ||
1da177e4 | 880 | /* deal with pending signal delivery */ |
5a8da0ea | 881 | if (thread_info_flags & _TIF_SIGPENDING) |
283828f3 | 882 | do_signal(regs); |
8f4d37ec | 883 | |
59e52130 RM |
884 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { |
885 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
886 | tracehook_notify_resume(regs); | |
887 | } | |
888 | ||
ee847c54 | 889 | #ifdef CONFIG_X86_32 |
1da177e4 | 890 | clear_thread_flag(TIF_IRET); |
ee847c54 | 891 | #endif /* CONFIG_X86_32 */ |
1da177e4 | 892 | } |
72fa50f4 HS |
893 | |
894 | void signal_fault(struct pt_regs *regs, void __user *frame, char *where) | |
895 | { | |
896 | struct task_struct *me = current; | |
897 | ||
898 | if (show_unhandled_signals && printk_ratelimit()) { | |
ae417bb4 | 899 | printk("%s" |
72fa50f4 | 900 | "%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx", |
ae417bb4 | 901 | task_pid_nr(current) > 1 ? KERN_INFO : KERN_EMERG, |
72fa50f4 HS |
902 | me->comm, me->pid, where, frame, |
903 | regs->ip, regs->sp, regs->orig_ax); | |
904 | print_vma_addr(" in ", regs->ip); | |
905 | printk(KERN_CONT "\n"); | |
906 | } | |
907 | ||
908 | force_sig(SIGSEGV, me); | |
909 | } |