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Commit | Line | Data |
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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 | 8 | */ |
5c9b3a0c HS |
9 | #include <linux/sched.h> |
10 | #include <linux/mm.h> | |
11 | #include <linux/smp.h> | |
1da177e4 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/signal.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/wait.h> | |
5c9b3a0c | 16 | #include <linux/ptrace.h> |
36a03308 | 17 | #include <linux/tracehook.h> |
5c9b3a0c HS |
18 | #include <linux/unistd.h> |
19 | #include <linux/stddef.h> | |
20 | #include <linux/personality.h> | |
21 | #include <linux/uaccess.h> | |
7e907f48 | 22 | |
1da177e4 LT |
23 | #include <asm/processor.h> |
24 | #include <asm/ucontext.h> | |
1da177e4 | 25 | #include <asm/i387.h> |
6c3652ef | 26 | #include <asm/vdso.h> |
4efc0670 | 27 | #include <asm/mce.h> |
5c9b3a0c HS |
28 | |
29 | #ifdef CONFIG_X86_64 | |
30 | #include <asm/proto.h> | |
31 | #include <asm/ia32_unistd.h> | |
5c9b3a0c HS |
32 | #endif /* CONFIG_X86_64 */ |
33 | ||
bb57925f | 34 | #include <asm/syscall.h> |
bbc1f698 | 35 | #include <asm/syscalls.h> |
7e907f48 | 36 | |
41af86fa | 37 | #include <asm/sigframe.h> |
1da177e4 | 38 | |
1da177e4 LT |
39 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
40 | ||
1a176803 HH |
41 | #define __FIX_EFLAGS (X86_EFLAGS_AC | X86_EFLAGS_OF | \ |
42 | X86_EFLAGS_DF | X86_EFLAGS_TF | X86_EFLAGS_SF | \ | |
43 | X86_EFLAGS_ZF | X86_EFLAGS_AF | X86_EFLAGS_PF | \ | |
44 | X86_EFLAGS_CF) | |
45 | ||
46 | #ifdef CONFIG_X86_32 | |
47 | # define FIX_EFLAGS (__FIX_EFLAGS | X86_EFLAGS_RF) | |
48 | #else | |
49 | # define FIX_EFLAGS __FIX_EFLAGS | |
50 | #endif | |
51 | ||
d9a89a26 TH |
52 | #define COPY(x) do { \ |
53 | get_user_ex(regs->x, &sc->x); \ | |
54 | } while (0) | |
2601657d | 55 | |
d9a89a26 TH |
56 | #define GET_SEG(seg) ({ \ |
57 | unsigned short tmp; \ | |
58 | get_user_ex(tmp, &sc->seg); \ | |
59 | tmp; \ | |
60 | }) | |
2601657d | 61 | |
d9a89a26 TH |
62 | #define COPY_SEG(seg) do { \ |
63 | regs->seg = GET_SEG(seg); \ | |
64 | } while (0) | |
2601657d | 65 | |
d9a89a26 TH |
66 | #define COPY_SEG_CPL3(seg) do { \ |
67 | regs->seg = GET_SEG(seg) | 3; \ | |
68 | } while (0) | |
2601657d HS |
69 | |
70 | static int | |
71 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, | |
72 | unsigned long *pax) | |
73 | { | |
74 | void __user *buf; | |
75 | unsigned int tmpflags; | |
76 | unsigned int err = 0; | |
77 | ||
78 | /* Always make any pending restarted system calls return -EINTR */ | |
79 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
80 | ||
98e3d45e HS |
81 | get_user_try { |
82 | ||
2601657d | 83 | #ifdef CONFIG_X86_32 |
d9a89a26 | 84 | set_user_gs(regs, GET_SEG(gs)); |
98e3d45e HS |
85 | COPY_SEG(fs); |
86 | COPY_SEG(es); | |
87 | COPY_SEG(ds); | |
2601657d HS |
88 | #endif /* CONFIG_X86_32 */ |
89 | ||
98e3d45e HS |
90 | COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx); |
91 | COPY(dx); COPY(cx); COPY(ip); | |
2601657d HS |
92 | |
93 | #ifdef CONFIG_X86_64 | |
98e3d45e HS |
94 | COPY(r8); |
95 | COPY(r9); | |
96 | COPY(r10); | |
97 | COPY(r11); | |
98 | COPY(r12); | |
99 | COPY(r13); | |
100 | COPY(r14); | |
101 | COPY(r15); | |
2601657d HS |
102 | #endif /* CONFIG_X86_64 */ |
103 | ||
104 | #ifdef CONFIG_X86_32 | |
98e3d45e HS |
105 | COPY_SEG_CPL3(cs); |
106 | COPY_SEG_CPL3(ss); | |
2601657d | 107 | #else /* !CONFIG_X86_32 */ |
98e3d45e HS |
108 | /* Kernel saves and restores only the CS segment register on signals, |
109 | * which is the bare minimum needed to allow mixed 32/64-bit code. | |
110 | * App's signal handler can save/restore other segments if needed. */ | |
111 | COPY_SEG_CPL3(cs); | |
2601657d HS |
112 | #endif /* CONFIG_X86_32 */ |
113 | ||
98e3d45e HS |
114 | get_user_ex(tmpflags, &sc->flags); |
115 | regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS); | |
116 | regs->orig_ax = -1; /* disable syscall checks */ | |
117 | ||
118 | get_user_ex(buf, &sc->fpstate); | |
119 | err |= restore_i387_xstate(buf); | |
2601657d | 120 | |
98e3d45e HS |
121 | get_user_ex(*pax, &sc->ax); |
122 | } get_user_catch(err); | |
2601657d | 123 | |
2601657d HS |
124 | return err; |
125 | } | |
126 | ||
127 | static int | |
128 | setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate, | |
129 | struct pt_regs *regs, unsigned long mask) | |
130 | { | |
131 | int err = 0; | |
132 | ||
98e3d45e | 133 | put_user_try { |
2601657d | 134 | |
98e3d45e | 135 | #ifdef CONFIG_X86_32 |
d9a89a26 | 136 | put_user_ex(get_user_gs(regs), (unsigned int __user *)&sc->gs); |
98e3d45e HS |
137 | put_user_ex(regs->fs, (unsigned int __user *)&sc->fs); |
138 | put_user_ex(regs->es, (unsigned int __user *)&sc->es); | |
139 | put_user_ex(regs->ds, (unsigned int __user *)&sc->ds); | |
2601657d HS |
140 | #endif /* CONFIG_X86_32 */ |
141 | ||
98e3d45e HS |
142 | put_user_ex(regs->di, &sc->di); |
143 | put_user_ex(regs->si, &sc->si); | |
144 | put_user_ex(regs->bp, &sc->bp); | |
145 | put_user_ex(regs->sp, &sc->sp); | |
146 | put_user_ex(regs->bx, &sc->bx); | |
147 | put_user_ex(regs->dx, &sc->dx); | |
148 | put_user_ex(regs->cx, &sc->cx); | |
149 | put_user_ex(regs->ax, &sc->ax); | |
2601657d | 150 | #ifdef CONFIG_X86_64 |
98e3d45e HS |
151 | put_user_ex(regs->r8, &sc->r8); |
152 | put_user_ex(regs->r9, &sc->r9); | |
153 | put_user_ex(regs->r10, &sc->r10); | |
154 | put_user_ex(regs->r11, &sc->r11); | |
155 | put_user_ex(regs->r12, &sc->r12); | |
156 | put_user_ex(regs->r13, &sc->r13); | |
157 | put_user_ex(regs->r14, &sc->r14); | |
158 | put_user_ex(regs->r15, &sc->r15); | |
2601657d HS |
159 | #endif /* CONFIG_X86_64 */ |
160 | ||
98e3d45e HS |
161 | put_user_ex(current->thread.trap_no, &sc->trapno); |
162 | put_user_ex(current->thread.error_code, &sc->err); | |
163 | put_user_ex(regs->ip, &sc->ip); | |
2601657d | 164 | #ifdef CONFIG_X86_32 |
98e3d45e HS |
165 | put_user_ex(regs->cs, (unsigned int __user *)&sc->cs); |
166 | put_user_ex(regs->flags, &sc->flags); | |
167 | put_user_ex(regs->sp, &sc->sp_at_signal); | |
168 | put_user_ex(regs->ss, (unsigned int __user *)&sc->ss); | |
2601657d | 169 | #else /* !CONFIG_X86_32 */ |
98e3d45e HS |
170 | put_user_ex(regs->flags, &sc->flags); |
171 | put_user_ex(regs->cs, &sc->cs); | |
172 | put_user_ex(0, &sc->gs); | |
173 | put_user_ex(0, &sc->fs); | |
2601657d HS |
174 | #endif /* CONFIG_X86_32 */ |
175 | ||
98e3d45e | 176 | put_user_ex(fpstate, &sc->fpstate); |
2601657d | 177 | |
98e3d45e HS |
178 | /* non-iBCS2 extensions.. */ |
179 | put_user_ex(mask, &sc->oldmask); | |
180 | put_user_ex(current->thread.cr2, &sc->cr2); | |
181 | } put_user_catch(err); | |
2601657d HS |
182 | |
183 | return err; | |
184 | } | |
185 | ||
1da177e4 | 186 | /* |
bfeb91a9 | 187 | * Set up a signal frame. |
1da177e4 | 188 | */ |
1da177e4 LT |
189 | |
190 | /* | |
191 | * Determine which stack to use.. | |
192 | */ | |
1fae0279 HS |
193 | static unsigned long align_sigframe(unsigned long sp) |
194 | { | |
195 | #ifdef CONFIG_X86_32 | |
196 | /* | |
197 | * Align the stack pointer according to the i386 ABI, | |
198 | * i.e. so that on function entry ((sp + 4) & 15) == 0. | |
199 | */ | |
200 | sp = ((sp + 4) & -16ul) - 4; | |
201 | #else /* !CONFIG_X86_32 */ | |
202 | sp = round_down(sp, 16) - 8; | |
203 | #endif | |
204 | return sp; | |
205 | } | |
206 | ||
1da177e4 | 207 | static inline void __user * |
3c1c7f10 | 208 | get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size, |
144b0712 | 209 | void __user **fpstate) |
1da177e4 | 210 | { |
1da177e4 | 211 | /* Default to using normal stack */ |
75779f05 | 212 | unsigned long sp = regs->sp; |
14fc9fbc | 213 | int onsigstack = on_sig_stack(sp); |
75779f05 HS |
214 | |
215 | #ifdef CONFIG_X86_64 | |
216 | /* redzone */ | |
217 | sp -= 128; | |
218 | #endif /* CONFIG_X86_64 */ | |
1da177e4 | 219 | |
14fc9fbc HS |
220 | if (!onsigstack) { |
221 | /* This is the X/Open sanctioned signal stack switching. */ | |
222 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
0f8f3089 | 223 | if (current->sas_ss_size) |
14fc9fbc HS |
224 | sp = current->sas_ss_sp + current->sas_ss_size; |
225 | } else { | |
75779f05 | 226 | #ifdef CONFIG_X86_32 |
14fc9fbc HS |
227 | /* This is the legacy signal stack switching. */ |
228 | if ((regs->ss & 0xffff) != __USER_DS && | |
229 | !(ka->sa.sa_flags & SA_RESTORER) && | |
230 | ka->sa.sa_restorer) | |
231 | sp = (unsigned long) ka->sa.sa_restorer; | |
75779f05 | 232 | #endif /* CONFIG_X86_32 */ |
14fc9fbc | 233 | } |
1da177e4 LT |
234 | } |
235 | ||
3c1c7f10 | 236 | if (used_math()) { |
75779f05 | 237 | sp -= sig_xstate_size; |
25051702 HS |
238 | #ifdef CONFIG_X86_64 |
239 | sp = round_down(sp, 64); | |
240 | #endif /* CONFIG_X86_64 */ | |
241 | *fpstate = (void __user *)sp; | |
3c1c7f10 SS |
242 | } |
243 | ||
14fc9fbc HS |
244 | sp = align_sigframe(sp - frame_size); |
245 | ||
246 | /* | |
247 | * If we are on the alternate signal stack and would overflow it, don't. | |
248 | * Return an always-bogus address instead so we will die with SIGSEGV. | |
249 | */ | |
250 | if (onsigstack && !likely(on_sig_stack(sp))) | |
251 | return (void __user *)-1L; | |
252 | ||
253 | /* save i387 state */ | |
254 | if (used_math() && save_i387_xstate(*fpstate) < 0) | |
255 | return (void __user *)-1L; | |
256 | ||
257 | return (void __user *)sp; | |
1da177e4 LT |
258 | } |
259 | ||
75779f05 HS |
260 | #ifdef CONFIG_X86_32 |
261 | static const struct { | |
262 | u16 poplmovl; | |
263 | u32 val; | |
264 | u16 int80; | |
265 | } __attribute__((packed)) retcode = { | |
266 | 0xb858, /* popl %eax; movl $..., %eax */ | |
267 | __NR_sigreturn, | |
268 | 0x80cd, /* int $0x80 */ | |
269 | }; | |
270 | ||
271 | static const struct { | |
272 | u8 movl; | |
273 | u32 val; | |
274 | u16 int80; | |
275 | u8 pad; | |
276 | } __attribute__((packed)) rt_retcode = { | |
277 | 0xb8, /* movl $..., %eax */ | |
278 | __NR_rt_sigreturn, | |
279 | 0x80cd, /* int $0x80 */ | |
280 | 0 | |
281 | }; | |
282 | ||
7e907f48 | 283 | static int |
1d13024e HS |
284 | __setup_frame(int sig, struct k_sigaction *ka, sigset_t *set, |
285 | struct pt_regs *regs) | |
1da177e4 | 286 | { |
1da177e4 | 287 | struct sigframe __user *frame; |
7e907f48 | 288 | void __user *restorer; |
1da177e4 | 289 | int err = 0; |
ab513701 | 290 | void __user *fpstate = NULL; |
1da177e4 | 291 | |
3c1c7f10 | 292 | frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate); |
1da177e4 LT |
293 | |
294 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
3d0aedd9 | 295 | return -EFAULT; |
1da177e4 | 296 | |
2ba48e16 | 297 | if (__put_user(sig, &frame->sig)) |
3d0aedd9 | 298 | return -EFAULT; |
1da177e4 | 299 | |
2ba48e16 | 300 | if (setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0])) |
3d0aedd9 | 301 | return -EFAULT; |
1da177e4 LT |
302 | |
303 | if (_NSIG_WORDS > 1) { | |
2ba48e16 HS |
304 | if (__copy_to_user(&frame->extramask, &set->sig[1], |
305 | sizeof(frame->extramask))) | |
3d0aedd9 | 306 | return -EFAULT; |
1da177e4 LT |
307 | } |
308 | ||
1a3e4ca4 | 309 | if (current->mm->context.vdso) |
6c3652ef | 310 | restorer = VDSO32_SYMBOL(current->mm->context.vdso, sigreturn); |
9fbbd4dd | 311 | else |
ade1af77 | 312 | restorer = &frame->retcode; |
1da177e4 LT |
313 | if (ka->sa.sa_flags & SA_RESTORER) |
314 | restorer = ka->sa.sa_restorer; | |
315 | ||
316 | /* Set up to return from userspace. */ | |
317 | err |= __put_user(restorer, &frame->pretcode); | |
7e907f48 | 318 | |
1da177e4 | 319 | /* |
7e907f48 | 320 | * This is popl %eax ; movl $__NR_sigreturn, %eax ; int $0x80 |
1da177e4 LT |
321 | * |
322 | * WE DO NOT USE IT ANY MORE! It's only left here for historical | |
323 | * reasons and because gdb uses it as a signature to notice | |
324 | * signal handler stack frames. | |
325 | */ | |
4a612048 | 326 | err |= __put_user(*((u64 *)&retcode), (u64 *)frame->retcode); |
1da177e4 LT |
327 | |
328 | if (err) | |
3d0aedd9 | 329 | return -EFAULT; |
1da177e4 LT |
330 | |
331 | /* Set up registers for signal handler */ | |
7e907f48 IM |
332 | regs->sp = (unsigned long)frame; |
333 | regs->ip = (unsigned long)ka->sa.sa_handler; | |
334 | regs->ax = (unsigned long)sig; | |
92bc2056 HH |
335 | regs->dx = 0; |
336 | regs->cx = 0; | |
1da177e4 | 337 | |
65ea5b03 PA |
338 | regs->ds = __USER_DS; |
339 | regs->es = __USER_DS; | |
340 | regs->ss = __USER_DS; | |
341 | regs->cs = __USER_CS; | |
1da177e4 | 342 | |
283828f3 | 343 | return 0; |
1da177e4 LT |
344 | } |
345 | ||
1d13024e HS |
346 | static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
347 | sigset_t *set, struct pt_regs *regs) | |
1da177e4 | 348 | { |
1da177e4 | 349 | struct rt_sigframe __user *frame; |
7e907f48 | 350 | void __user *restorer; |
1da177e4 | 351 | int err = 0; |
ab513701 | 352 | void __user *fpstate = NULL; |
1da177e4 | 353 | |
3c1c7f10 | 354 | frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate); |
1da177e4 LT |
355 | |
356 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
3d0aedd9 | 357 | return -EFAULT; |
1da177e4 | 358 | |
98e3d45e HS |
359 | put_user_try { |
360 | put_user_ex(sig, &frame->sig); | |
361 | put_user_ex(&frame->info, &frame->pinfo); | |
362 | put_user_ex(&frame->uc, &frame->puc); | |
363 | err |= copy_siginfo_to_user(&frame->info, info); | |
364 | ||
365 | /* Create the ucontext. */ | |
366 | if (cpu_has_xsave) | |
367 | put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags); | |
368 | else | |
369 | put_user_ex(0, &frame->uc.uc_flags); | |
370 | put_user_ex(0, &frame->uc.uc_link); | |
371 | put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
372 | put_user_ex(sas_ss_flags(regs->sp), | |
373 | &frame->uc.uc_stack.ss_flags); | |
374 | put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
375 | err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate, | |
376 | regs, set->sig[0]); | |
377 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
378 | ||
379 | /* Set up to return from userspace. */ | |
380 | restorer = VDSO32_SYMBOL(current->mm->context.vdso, rt_sigreturn); | |
381 | if (ka->sa.sa_flags & SA_RESTORER) | |
382 | restorer = ka->sa.sa_restorer; | |
383 | put_user_ex(restorer, &frame->pretcode); | |
384 | ||
385 | /* | |
386 | * This is movl $__NR_rt_sigreturn, %ax ; int $0x80 | |
387 | * | |
388 | * WE DO NOT USE IT ANY MORE! It's only left here for historical | |
389 | * reasons and because gdb uses it as a signature to notice | |
390 | * signal handler stack frames. | |
391 | */ | |
392 | put_user_ex(*((u64 *)&rt_retcode), (u64 *)frame->retcode); | |
393 | } put_user_catch(err); | |
1da177e4 LT |
394 | |
395 | if (err) | |
3d0aedd9 | 396 | return -EFAULT; |
1da177e4 LT |
397 | |
398 | /* Set up registers for signal handler */ | |
7e907f48 IM |
399 | regs->sp = (unsigned long)frame; |
400 | regs->ip = (unsigned long)ka->sa.sa_handler; | |
13ad7725 | 401 | regs->ax = (unsigned long)sig; |
7e907f48 IM |
402 | regs->dx = (unsigned long)&frame->info; |
403 | regs->cx = (unsigned long)&frame->uc; | |
1da177e4 | 404 | |
65ea5b03 PA |
405 | regs->ds = __USER_DS; |
406 | regs->es = __USER_DS; | |
407 | regs->ss = __USER_DS; | |
408 | regs->cs = __USER_CS; | |
1da177e4 | 409 | |
283828f3 | 410 | return 0; |
1da177e4 | 411 | } |
bfeb91a9 | 412 | #else /* !CONFIG_X86_32 */ |
bfeb91a9 HS |
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 | ||
97286a2b | 421 | frame = get_sigframe(ka, regs, sizeof(struct rt_sigframe), &fp); |
bfeb91a9 HS |
422 | |
423 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
424 | return -EFAULT; | |
425 | ||
426 | if (ka->sa.sa_flags & SA_SIGINFO) { | |
427 | if (copy_siginfo_to_user(&frame->info, info)) | |
428 | return -EFAULT; | |
429 | } | |
430 | ||
98e3d45e HS |
431 | put_user_try { |
432 | /* Create the ucontext. */ | |
433 | if (cpu_has_xsave) | |
434 | put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags); | |
435 | else | |
436 | put_user_ex(0, &frame->uc.uc_flags); | |
437 | put_user_ex(0, &frame->uc.uc_link); | |
438 | put_user_ex(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
439 | put_user_ex(sas_ss_flags(regs->sp), | |
440 | &frame->uc.uc_stack.ss_flags); | |
441 | put_user_ex(me->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
442 | err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]); | |
443 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
444 | ||
445 | /* Set up to return from userspace. If provided, use a stub | |
446 | already in userspace. */ | |
447 | /* x86-64 should always use SA_RESTORER. */ | |
448 | if (ka->sa.sa_flags & SA_RESTORER) { | |
449 | put_user_ex(ka->sa.sa_restorer, &frame->pretcode); | |
450 | } else { | |
451 | /* could use a vstub here */ | |
452 | err |= -EFAULT; | |
453 | } | |
454 | } put_user_catch(err); | |
bfeb91a9 HS |
455 | |
456 | if (err) | |
457 | return -EFAULT; | |
458 | ||
459 | /* Set up registers for signal handler */ | |
460 | regs->di = sig; | |
461 | /* In case the signal handler was declared without prototypes */ | |
462 | regs->ax = 0; | |
463 | ||
464 | /* This also works for non SA_SIGINFO handlers because they expect the | |
465 | next argument after the signal number on the stack. */ | |
466 | regs->si = (unsigned long)&frame->info; | |
467 | regs->dx = (unsigned long)&frame->uc; | |
468 | regs->ip = (unsigned long) ka->sa.sa_handler; | |
469 | ||
470 | regs->sp = (unsigned long)frame; | |
471 | ||
472 | /* Set up the CS register to run signal handlers in 64-bit mode, | |
473 | even if the handler happens to be interrupting 32-bit code. */ | |
474 | regs->cs = __USER_CS; | |
475 | ||
476 | return 0; | |
477 | } | |
478 | #endif /* CONFIG_X86_32 */ | |
479 | ||
e5fa2d06 | 480 | #ifdef CONFIG_X86_32 |
bfeb91a9 HS |
481 | /* |
482 | * Atomically swap in the new signal mask, and wait for a signal. | |
483 | */ | |
484 | asmlinkage int | |
485 | sys_sigsuspend(int history0, int history1, old_sigset_t mask) | |
486 | { | |
487 | mask &= _BLOCKABLE; | |
488 | spin_lock_irq(¤t->sighand->siglock); | |
489 | current->saved_sigmask = current->blocked; | |
490 | siginitset(¤t->blocked, mask); | |
491 | recalc_sigpending(); | |
492 | spin_unlock_irq(¤t->sighand->siglock); | |
493 | ||
494 | current->state = TASK_INTERRUPTIBLE; | |
495 | schedule(); | |
496 | set_restore_sigmask(); | |
497 | ||
498 | return -ERESTARTNOHAND; | |
499 | } | |
500 | ||
501 | asmlinkage int | |
502 | sys_sigaction(int sig, const struct old_sigaction __user *act, | |
503 | struct old_sigaction __user *oact) | |
504 | { | |
505 | struct k_sigaction new_ka, old_ka; | |
98e3d45e | 506 | int ret = 0; |
bfeb91a9 HS |
507 | |
508 | if (act) { | |
509 | old_sigset_t mask; | |
510 | ||
98e3d45e | 511 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) |
bfeb91a9 HS |
512 | return -EFAULT; |
513 | ||
98e3d45e HS |
514 | get_user_try { |
515 | get_user_ex(new_ka.sa.sa_handler, &act->sa_handler); | |
516 | get_user_ex(new_ka.sa.sa_flags, &act->sa_flags); | |
517 | get_user_ex(mask, &act->sa_mask); | |
518 | get_user_ex(new_ka.sa.sa_restorer, &act->sa_restorer); | |
519 | } get_user_catch(ret); | |
520 | ||
521 | if (ret) | |
522 | return -EFAULT; | |
bfeb91a9 HS |
523 | siginitset(&new_ka.sa.sa_mask, mask); |
524 | } | |
525 | ||
526 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
527 | ||
528 | if (!ret && oact) { | |
98e3d45e | 529 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) |
bfeb91a9 HS |
530 | return -EFAULT; |
531 | ||
98e3d45e HS |
532 | put_user_try { |
533 | put_user_ex(old_ka.sa.sa_handler, &oact->sa_handler); | |
534 | put_user_ex(old_ka.sa.sa_flags, &oact->sa_flags); | |
535 | put_user_ex(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); | |
536 | put_user_ex(old_ka.sa.sa_restorer, &oact->sa_restorer); | |
537 | } put_user_catch(ret); | |
538 | ||
539 | if (ret) | |
540 | return -EFAULT; | |
bfeb91a9 HS |
541 | } |
542 | ||
543 | return ret; | |
544 | } | |
e5fa2d06 | 545 | #endif /* CONFIG_X86_32 */ |
bfeb91a9 HS |
546 | |
547 | #ifdef CONFIG_X86_32 | |
b12bdaf1 BG |
548 | int sys_sigaltstack(struct pt_regs *regs) |
549 | { | |
550 | const stack_t __user *uss = (const stack_t __user *)regs->bx; | |
551 | stack_t __user *uoss = (stack_t __user *)regs->cx; | |
552 | ||
553 | return do_sigaltstack(uss, uoss, regs->sp); | |
554 | } | |
bfeb91a9 HS |
555 | #else /* !CONFIG_X86_32 */ |
556 | asmlinkage long | |
557 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, | |
558 | struct pt_regs *regs) | |
559 | { | |
560 | return do_sigaltstack(uss, uoss, regs->sp); | |
561 | } | |
b12bdaf1 | 562 | #endif /* CONFIG_X86_32 */ |
bfeb91a9 HS |
563 | |
564 | /* | |
565 | * Do a signal return; undo the signal stack. | |
566 | */ | |
e5fa2d06 | 567 | #ifdef CONFIG_X86_32 |
b12bdaf1 | 568 | unsigned long sys_sigreturn(struct pt_regs *regs) |
bfeb91a9 HS |
569 | { |
570 | struct sigframe __user *frame; | |
bfeb91a9 HS |
571 | unsigned long ax; |
572 | sigset_t set; | |
573 | ||
bfeb91a9 HS |
574 | frame = (struct sigframe __user *)(regs->sp - 8); |
575 | ||
576 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
577 | goto badframe; | |
578 | if (__get_user(set.sig[0], &frame->sc.oldmask) || (_NSIG_WORDS > 1 | |
579 | && __copy_from_user(&set.sig[1], &frame->extramask, | |
580 | sizeof(frame->extramask)))) | |
581 | goto badframe; | |
582 | ||
583 | sigdelsetmask(&set, ~_BLOCKABLE); | |
584 | spin_lock_irq(¤t->sighand->siglock); | |
585 | current->blocked = set; | |
586 | recalc_sigpending(); | |
587 | spin_unlock_irq(¤t->sighand->siglock); | |
588 | ||
589 | if (restore_sigcontext(regs, &frame->sc, &ax)) | |
590 | goto badframe; | |
591 | return ax; | |
592 | ||
593 | badframe: | |
ae417bb4 | 594 | signal_fault(regs, frame, "sigreturn"); |
bfeb91a9 HS |
595 | |
596 | return 0; | |
597 | } | |
e5fa2d06 | 598 | #endif /* CONFIG_X86_32 */ |
bfeb91a9 | 599 | |
74452509 | 600 | long sys_rt_sigreturn(struct pt_regs *regs) |
bfeb91a9 HS |
601 | { |
602 | struct rt_sigframe __user *frame; | |
603 | unsigned long ax; | |
604 | sigset_t set; | |
605 | ||
606 | frame = (struct rt_sigframe __user *)(regs->sp - sizeof(long)); | |
607 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
608 | goto badframe; | |
609 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
610 | goto badframe; | |
611 | ||
612 | sigdelsetmask(&set, ~_BLOCKABLE); | |
613 | spin_lock_irq(¤t->sighand->siglock); | |
614 | current->blocked = set; | |
615 | recalc_sigpending(); | |
616 | spin_unlock_irq(¤t->sighand->siglock); | |
617 | ||
618 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax)) | |
619 | goto badframe; | |
620 | ||
621 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT) | |
622 | goto badframe; | |
623 | ||
624 | return ax; | |
625 | ||
626 | badframe: | |
627 | signal_fault(regs, frame, "rt_sigreturn"); | |
628 | return 0; | |
629 | } | |
630 | ||
1da177e4 | 631 | /* |
7e907f48 IM |
632 | * OK, we're invoking a handler: |
633 | */ | |
8d8c13bd HS |
634 | static int signr_convert(int sig) |
635 | { | |
96bf84b7 | 636 | #ifdef CONFIG_X86_32 |
8d8c13bd HS |
637 | struct thread_info *info = current_thread_info(); |
638 | ||
639 | if (info->exec_domain && info->exec_domain->signal_invmap && sig < 32) | |
640 | return info->exec_domain->signal_invmap[sig]; | |
96bf84b7 | 641 | #endif /* CONFIG_X86_32 */ |
8d8c13bd HS |
642 | return sig; |
643 | } | |
644 | ||
cabf5035 HS |
645 | #ifdef CONFIG_X86_32 |
646 | ||
455edbc4 | 647 | #define is_ia32 1 |
4694d239 HS |
648 | #define ia32_setup_frame __setup_frame |
649 | #define ia32_setup_rt_frame __setup_rt_frame | |
455edbc4 | 650 | |
cabf5035 HS |
651 | #else /* !CONFIG_X86_32 */ |
652 | ||
653 | #ifdef CONFIG_IA32_EMULATION | |
654 | #define is_ia32 test_thread_flag(TIF_IA32) | |
655 | #else /* !CONFIG_IA32_EMULATION */ | |
656 | #define is_ia32 0 | |
657 | #endif /* CONFIG_IA32_EMULATION */ | |
658 | ||
f5223763 HS |
659 | int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
660 | sigset_t *set, struct pt_regs *regs); | |
661 | int ia32_setup_frame(int sig, struct k_sigaction *ka, | |
662 | sigset_t *set, struct pt_regs *regs); | |
663 | ||
cabf5035 HS |
664 | #endif /* CONFIG_X86_32 */ |
665 | ||
1d13024e HS |
666 | static int |
667 | setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, | |
668 | sigset_t *set, struct pt_regs *regs) | |
669 | { | |
8d8c13bd | 670 | int usig = signr_convert(sig); |
1d13024e HS |
671 | int ret; |
672 | ||
673 | /* Set up the stack frame */ | |
455edbc4 HS |
674 | if (is_ia32) { |
675 | if (ka->sa.sa_flags & SA_SIGINFO) | |
4694d239 | 676 | ret = ia32_setup_rt_frame(usig, ka, info, set, regs); |
455edbc4 | 677 | else |
4694d239 | 678 | ret = ia32_setup_frame(usig, ka, set, regs); |
455edbc4 HS |
679 | } else |
680 | ret = __setup_rt_frame(sig, ka, info, set, regs); | |
1d13024e | 681 | |
3d0aedd9 HS |
682 | if (ret) { |
683 | force_sigsegv(sig, current); | |
684 | return -EFAULT; | |
685 | } | |
686 | ||
1d13024e HS |
687 | return ret; |
688 | } | |
689 | ||
7c1def16 | 690 | static int |
1da177e4 | 691 | handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, |
ac66f3fd | 692 | sigset_t *oldset, struct pt_regs *regs) |
1da177e4 | 693 | { |
7c1def16 RM |
694 | int ret; |
695 | ||
1da177e4 | 696 | /* Are we from a system call? */ |
bb57925f | 697 | if (syscall_get_nr(current, regs) >= 0) { |
1da177e4 | 698 | /* If so, check system call restarting.. */ |
bb57925f | 699 | switch (syscall_get_error(current, regs)) { |
ac66f3fd HH |
700 | case -ERESTART_RESTARTBLOCK: |
701 | case -ERESTARTNOHAND: | |
702 | regs->ax = -EINTR; | |
703 | break; | |
704 | ||
705 | case -ERESTARTSYS: | |
706 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
65ea5b03 | 707 | regs->ax = -EINTR; |
1da177e4 | 708 | break; |
ac66f3fd HH |
709 | } |
710 | /* fallthrough */ | |
711 | case -ERESTARTNOINTR: | |
712 | regs->ax = regs->orig_ax; | |
713 | regs->ip -= 2; | |
714 | break; | |
1da177e4 LT |
715 | } |
716 | } | |
717 | ||
718 | /* | |
e1f28773 RM |
719 | * If TF is set due to a debugger (TIF_FORCED_TF), clear the TF |
720 | * flag so that register information in the sigcontext is correct. | |
1da177e4 | 721 | */ |
65ea5b03 | 722 | if (unlikely(regs->flags & X86_EFLAGS_TF) && |
e1f28773 | 723 | likely(test_and_clear_thread_flag(TIF_FORCED_TF))) |
65ea5b03 | 724 | regs->flags &= ~X86_EFLAGS_TF; |
1da177e4 | 725 | |
1d13024e | 726 | ret = setup_rt_frame(sig, ka, info, oldset, regs); |
1da177e4 | 727 | |
7e907f48 IM |
728 | if (ret) |
729 | return ret; | |
7c1def16 | 730 | |
86d3237c HS |
731 | #ifdef CONFIG_X86_64 |
732 | /* | |
733 | * This has nothing to do with segment registers, | |
734 | * despite the name. This magic affects uaccess.h | |
735 | * macros' behavior. Reset it to the normal setting. | |
736 | */ | |
737 | set_fs(USER_DS); | |
738 | #endif | |
739 | ||
8b9c5ff3 RM |
740 | /* |
741 | * Clear the direction flag as per the ABI for function entry. | |
742 | */ | |
743 | regs->flags &= ~X86_EFLAGS_DF; | |
744 | ||
745 | /* | |
746 | * Clear TF when entering the signal handler, but | |
747 | * notify any tracer that was single-stepping it. | |
748 | * The tracer may want to single-step inside the | |
749 | * handler too. | |
750 | */ | |
751 | regs->flags &= ~X86_EFLAGS_TF; | |
8b9c5ff3 | 752 | |
7e907f48 IM |
753 | spin_lock_irq(¤t->sighand->siglock); |
754 | sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask); | |
755 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
756 | sigaddset(¤t->blocked, sig); | |
757 | recalc_sigpending(); | |
758 | spin_unlock_irq(¤t->sighand->siglock); | |
759 | ||
36a03308 RM |
760 | tracehook_signal_handler(sig, info, ka, regs, |
761 | test_thread_flag(TIF_SINGLESTEP)); | |
762 | ||
7e907f48 | 763 | return 0; |
1da177e4 LT |
764 | } |
765 | ||
57917752 | 766 | #ifdef CONFIG_X86_32 |
8fcd8e20 | 767 | #define NR_restart_syscall __NR_restart_syscall |
57917752 HS |
768 | #else /* !CONFIG_X86_32 */ |
769 | #define NR_restart_syscall \ | |
770 | test_thread_flag(TIF_IA32) ? __NR_ia32_restart_syscall : __NR_restart_syscall | |
771 | #endif /* CONFIG_X86_32 */ | |
772 | ||
1da177e4 LT |
773 | /* |
774 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
775 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
776 | * mistake. | |
777 | */ | |
75604d7f | 778 | static void do_signal(struct pt_regs *regs) |
1da177e4 | 779 | { |
ac66f3fd | 780 | struct k_sigaction ka; |
1da177e4 LT |
781 | siginfo_t info; |
782 | int signr; | |
283828f3 | 783 | sigset_t *oldset; |
1da177e4 LT |
784 | |
785 | /* | |
ac66f3fd HH |
786 | * We want the common case to go fast, which is why we may in certain |
787 | * cases get here from kernel mode. Just return without doing anything | |
788 | * if so. | |
789 | * X86_32: vm86 regs switched out by assembly code before reaching | |
790 | * here, so testing against kernel CS suffices. | |
1da177e4 | 791 | */ |
717b594a | 792 | if (!user_mode(regs)) |
283828f3 | 793 | return; |
1da177e4 | 794 | |
5a8da0ea | 795 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) |
283828f3 DH |
796 | oldset = ¤t->saved_sigmask; |
797 | else | |
1da177e4 LT |
798 | oldset = ¤t->blocked; |
799 | ||
800 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
801 | if (signr > 0) { | |
7e907f48 IM |
802 | /* |
803 | * Re-enable any watchpoints before delivering the | |
1da177e4 LT |
804 | * signal to user space. The processor register will |
805 | * have been cleared if the watchpoint triggered | |
806 | * inside the kernel. | |
807 | */ | |
ac66f3fd | 808 | if (current->thread.debugreg7) |
0f534093 | 809 | set_debugreg(current->thread.debugreg7, 7); |
1da177e4 | 810 | |
7e907f48 | 811 | /* Whee! Actually deliver the signal. */ |
283828f3 | 812 | if (handle_signal(signr, &info, &ka, oldset, regs) == 0) { |
7e907f48 | 813 | /* |
5a8da0ea | 814 | * A signal was successfully delivered; the saved |
283828f3 DH |
815 | * sigmask will have been stored in the signal frame, |
816 | * and will be restored by sigreturn, so we can simply | |
5a8da0ea | 817 | * clear the TS_RESTORE_SIGMASK flag. |
7e907f48 | 818 | */ |
5a8da0ea | 819 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; |
283828f3 | 820 | } |
283828f3 | 821 | return; |
1da177e4 LT |
822 | } |
823 | ||
1da177e4 | 824 | /* Did we come from a system call? */ |
bb57925f | 825 | if (syscall_get_nr(current, regs) >= 0) { |
1da177e4 | 826 | /* Restart the system call - no handlers present */ |
bb57925f | 827 | switch (syscall_get_error(current, regs)) { |
283828f3 DH |
828 | case -ERESTARTNOHAND: |
829 | case -ERESTARTSYS: | |
830 | case -ERESTARTNOINTR: | |
65ea5b03 PA |
831 | regs->ax = regs->orig_ax; |
832 | regs->ip -= 2; | |
283828f3 DH |
833 | break; |
834 | ||
835 | case -ERESTART_RESTARTBLOCK: | |
8fcd8e20 | 836 | regs->ax = NR_restart_syscall; |
65ea5b03 | 837 | regs->ip -= 2; |
283828f3 | 838 | break; |
1da177e4 LT |
839 | } |
840 | } | |
283828f3 | 841 | |
ac66f3fd HH |
842 | /* |
843 | * If there's no signal to deliver, we just put the saved sigmask | |
844 | * back. | |
845 | */ | |
5a8da0ea RM |
846 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) { |
847 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; | |
283828f3 DH |
848 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); |
849 | } | |
1da177e4 LT |
850 | } |
851 | ||
852 | /* | |
853 | * notification of userspace execution resumption | |
283828f3 | 854 | * - triggered by the TIF_WORK_MASK flags |
1da177e4 | 855 | */ |
7e907f48 IM |
856 | void |
857 | do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags) | |
1da177e4 | 858 | { |
c1ebf835 | 859 | #ifdef CONFIG_X86_MCE |
ee847c54 HS |
860 | /* notify userspace of pending MCEs */ |
861 | if (thread_info_flags & _TIF_MCE_NOTIFY) | |
9b1beaf2 | 862 | mce_notify_process(); |
ee847c54 HS |
863 | #endif /* CONFIG_X86_64 && CONFIG_X86_MCE */ |
864 | ||
1da177e4 | 865 | /* deal with pending signal delivery */ |
5a8da0ea | 866 | if (thread_info_flags & _TIF_SIGPENDING) |
283828f3 | 867 | do_signal(regs); |
8f4d37ec | 868 | |
59e52130 RM |
869 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { |
870 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
871 | tracehook_notify_resume(regs); | |
ee18d64c DH |
872 | if (current->replacement_session_keyring) |
873 | key_replace_session_keyring(); | |
59e52130 RM |
874 | } |
875 | ||
ee847c54 | 876 | #ifdef CONFIG_X86_32 |
1da177e4 | 877 | clear_thread_flag(TIF_IRET); |
ee847c54 | 878 | #endif /* CONFIG_X86_32 */ |
1da177e4 | 879 | } |
72fa50f4 HS |
880 | |
881 | void signal_fault(struct pt_regs *regs, void __user *frame, char *where) | |
882 | { | |
883 | struct task_struct *me = current; | |
884 | ||
885 | if (show_unhandled_signals && printk_ratelimit()) { | |
ae417bb4 | 886 | printk("%s" |
72fa50f4 | 887 | "%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx", |
ae417bb4 | 888 | task_pid_nr(current) > 1 ? KERN_INFO : KERN_EMERG, |
72fa50f4 HS |
889 | me->comm, me->pid, where, frame, |
890 | regs->ip, regs->sp, regs->orig_ax); | |
891 | print_vma_addr(" in ", regs->ip); | |
892 | printk(KERN_CONT "\n"); | |
893 | } | |
894 | ||
895 | force_sig(SIGSEGV, me); | |
896 | } |