Commit | Line | Data |
---|---|---|
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 | 12 | #include <linux/kernel.h> |
1da177e4 LT |
13 | #include <linux/errno.h> |
14 | #include <linux/wait.h> | |
36a03308 | 15 | #include <linux/tracehook.h> |
5c9b3a0c HS |
16 | #include <linux/unistd.h> |
17 | #include <linux/stddef.h> | |
18 | #include <linux/personality.h> | |
19 | #include <linux/uaccess.h> | |
7c68af6e | 20 | #include <linux/user-return-notifier.h> |
7e907f48 | 21 | |
1da177e4 LT |
22 | #include <asm/processor.h> |
23 | #include <asm/ucontext.h> | |
1da177e4 | 24 | #include <asm/i387.h> |
6c3652ef | 25 | #include <asm/vdso.h> |
4efc0670 | 26 | #include <asm/mce.h> |
f28f0c23 | 27 | #include <asm/sighandling.h> |
5c9b3a0c HS |
28 | |
29 | #ifdef CONFIG_X86_64 | |
30 | #include <asm/proto.h> | |
31 | #include <asm/ia32_unistd.h> | |
c5a37394 | 32 | #include <asm/sys_ia32.h> |
5c9b3a0c HS |
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 | |
1a176803 HH |
40 | #ifdef CONFIG_X86_32 |
41 | # define FIX_EFLAGS (__FIX_EFLAGS | X86_EFLAGS_RF) | |
42 | #else | |
43 | # define FIX_EFLAGS __FIX_EFLAGS | |
44 | #endif | |
45 | ||
d9a89a26 TH |
46 | #define COPY(x) do { \ |
47 | get_user_ex(regs->x, &sc->x); \ | |
48 | } while (0) | |
2601657d | 49 | |
d9a89a26 TH |
50 | #define GET_SEG(seg) ({ \ |
51 | unsigned short tmp; \ | |
52 | get_user_ex(tmp, &sc->seg); \ | |
53 | tmp; \ | |
54 | }) | |
2601657d | 55 | |
d9a89a26 TH |
56 | #define COPY_SEG(seg) do { \ |
57 | regs->seg = GET_SEG(seg); \ | |
58 | } while (0) | |
2601657d | 59 | |
d9a89a26 TH |
60 | #define COPY_SEG_CPL3(seg) do { \ |
61 | regs->seg = GET_SEG(seg) | 3; \ | |
62 | } while (0) | |
2601657d | 63 | |
85139422 PA |
64 | int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, |
65 | unsigned long *pax) | |
2601657d HS |
66 | { |
67 | void __user *buf; | |
68 | unsigned int tmpflags; | |
69 | unsigned int err = 0; | |
70 | ||
71 | /* Always make any pending restarted system calls return -EINTR */ | |
72 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
73 | ||
98e3d45e HS |
74 | get_user_try { |
75 | ||
2601657d | 76 | #ifdef CONFIG_X86_32 |
d9a89a26 | 77 | set_user_gs(regs, GET_SEG(gs)); |
98e3d45e HS |
78 | COPY_SEG(fs); |
79 | COPY_SEG(es); | |
80 | COPY_SEG(ds); | |
2601657d HS |
81 | #endif /* CONFIG_X86_32 */ |
82 | ||
98e3d45e HS |
83 | COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx); |
84 | COPY(dx); COPY(cx); COPY(ip); | |
2601657d HS |
85 | |
86 | #ifdef CONFIG_X86_64 | |
98e3d45e HS |
87 | COPY(r8); |
88 | COPY(r9); | |
89 | COPY(r10); | |
90 | COPY(r11); | |
91 | COPY(r12); | |
92 | COPY(r13); | |
93 | COPY(r14); | |
94 | COPY(r15); | |
2601657d HS |
95 | #endif /* CONFIG_X86_64 */ |
96 | ||
97 | #ifdef CONFIG_X86_32 | |
98e3d45e HS |
98 | COPY_SEG_CPL3(cs); |
99 | COPY_SEG_CPL3(ss); | |
2601657d | 100 | #else /* !CONFIG_X86_32 */ |
98e3d45e HS |
101 | /* Kernel saves and restores only the CS segment register on signals, |
102 | * which is the bare minimum needed to allow mixed 32/64-bit code. | |
103 | * App's signal handler can save/restore other segments if needed. */ | |
104 | COPY_SEG_CPL3(cs); | |
2601657d HS |
105 | #endif /* CONFIG_X86_32 */ |
106 | ||
98e3d45e HS |
107 | get_user_ex(tmpflags, &sc->flags); |
108 | regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS); | |
109 | regs->orig_ax = -1; /* disable syscall checks */ | |
110 | ||
111 | get_user_ex(buf, &sc->fpstate); | |
112 | err |= restore_i387_xstate(buf); | |
2601657d | 113 | |
98e3d45e HS |
114 | get_user_ex(*pax, &sc->ax); |
115 | } get_user_catch(err); | |
2601657d | 116 | |
2601657d HS |
117 | return err; |
118 | } | |
119 | ||
85139422 PA |
120 | int setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate, |
121 | struct pt_regs *regs, unsigned long mask) | |
2601657d HS |
122 | { |
123 | int err = 0; | |
124 | ||
98e3d45e | 125 | put_user_try { |
2601657d | 126 | |
98e3d45e | 127 | #ifdef CONFIG_X86_32 |
d9a89a26 | 128 | put_user_ex(get_user_gs(regs), (unsigned int __user *)&sc->gs); |
98e3d45e HS |
129 | put_user_ex(regs->fs, (unsigned int __user *)&sc->fs); |
130 | put_user_ex(regs->es, (unsigned int __user *)&sc->es); | |
131 | put_user_ex(regs->ds, (unsigned int __user *)&sc->ds); | |
2601657d HS |
132 | #endif /* CONFIG_X86_32 */ |
133 | ||
98e3d45e HS |
134 | put_user_ex(regs->di, &sc->di); |
135 | put_user_ex(regs->si, &sc->si); | |
136 | put_user_ex(regs->bp, &sc->bp); | |
137 | put_user_ex(regs->sp, &sc->sp); | |
138 | put_user_ex(regs->bx, &sc->bx); | |
139 | put_user_ex(regs->dx, &sc->dx); | |
140 | put_user_ex(regs->cx, &sc->cx); | |
141 | put_user_ex(regs->ax, &sc->ax); | |
2601657d | 142 | #ifdef CONFIG_X86_64 |
98e3d45e HS |
143 | put_user_ex(regs->r8, &sc->r8); |
144 | put_user_ex(regs->r9, &sc->r9); | |
145 | put_user_ex(regs->r10, &sc->r10); | |
146 | put_user_ex(regs->r11, &sc->r11); | |
147 | put_user_ex(regs->r12, &sc->r12); | |
148 | put_user_ex(regs->r13, &sc->r13); | |
149 | put_user_ex(regs->r14, &sc->r14); | |
150 | put_user_ex(regs->r15, &sc->r15); | |
2601657d HS |
151 | #endif /* CONFIG_X86_64 */ |
152 | ||
98e3d45e HS |
153 | put_user_ex(current->thread.trap_no, &sc->trapno); |
154 | put_user_ex(current->thread.error_code, &sc->err); | |
155 | put_user_ex(regs->ip, &sc->ip); | |
2601657d | 156 | #ifdef CONFIG_X86_32 |
98e3d45e HS |
157 | put_user_ex(regs->cs, (unsigned int __user *)&sc->cs); |
158 | put_user_ex(regs->flags, &sc->flags); | |
159 | put_user_ex(regs->sp, &sc->sp_at_signal); | |
160 | put_user_ex(regs->ss, (unsigned int __user *)&sc->ss); | |
2601657d | 161 | #else /* !CONFIG_X86_32 */ |
98e3d45e HS |
162 | put_user_ex(regs->flags, &sc->flags); |
163 | put_user_ex(regs->cs, &sc->cs); | |
164 | put_user_ex(0, &sc->gs); | |
165 | put_user_ex(0, &sc->fs); | |
2601657d HS |
166 | #endif /* CONFIG_X86_32 */ |
167 | ||
98e3d45e | 168 | put_user_ex(fpstate, &sc->fpstate); |
2601657d | 169 | |
98e3d45e HS |
170 | /* non-iBCS2 extensions.. */ |
171 | put_user_ex(mask, &sc->oldmask); | |
172 | put_user_ex(current->thread.cr2, &sc->cr2); | |
173 | } put_user_catch(err); | |
2601657d HS |
174 | |
175 | return err; | |
176 | } | |
177 | ||
1da177e4 | 178 | /* |
bfeb91a9 | 179 | * Set up a signal frame. |
1da177e4 | 180 | */ |
1da177e4 LT |
181 | |
182 | /* | |
183 | * Determine which stack to use.. | |
184 | */ | |
1fae0279 HS |
185 | static unsigned long align_sigframe(unsigned long sp) |
186 | { | |
187 | #ifdef CONFIG_X86_32 | |
188 | /* | |
189 | * Align the stack pointer according to the i386 ABI, | |
190 | * i.e. so that on function entry ((sp + 4) & 15) == 0. | |
191 | */ | |
192 | sp = ((sp + 4) & -16ul) - 4; | |
193 | #else /* !CONFIG_X86_32 */ | |
194 | sp = round_down(sp, 16) - 8; | |
195 | #endif | |
196 | return sp; | |
197 | } | |
198 | ||
1da177e4 | 199 | static inline void __user * |
3c1c7f10 | 200 | get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size, |
144b0712 | 201 | void __user **fpstate) |
1da177e4 | 202 | { |
1da177e4 | 203 | /* Default to using normal stack */ |
75779f05 | 204 | unsigned long sp = regs->sp; |
14fc9fbc | 205 | int onsigstack = on_sig_stack(sp); |
75779f05 HS |
206 | |
207 | #ifdef CONFIG_X86_64 | |
208 | /* redzone */ | |
209 | sp -= 128; | |
210 | #endif /* CONFIG_X86_64 */ | |
1da177e4 | 211 | |
14fc9fbc HS |
212 | if (!onsigstack) { |
213 | /* This is the X/Open sanctioned signal stack switching. */ | |
214 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
0f8f3089 | 215 | if (current->sas_ss_size) |
14fc9fbc HS |
216 | sp = current->sas_ss_sp + current->sas_ss_size; |
217 | } else { | |
75779f05 | 218 | #ifdef CONFIG_X86_32 |
14fc9fbc HS |
219 | /* This is the legacy signal stack switching. */ |
220 | if ((regs->ss & 0xffff) != __USER_DS && | |
221 | !(ka->sa.sa_flags & SA_RESTORER) && | |
222 | ka->sa.sa_restorer) | |
223 | sp = (unsigned long) ka->sa.sa_restorer; | |
75779f05 | 224 | #endif /* CONFIG_X86_32 */ |
14fc9fbc | 225 | } |
1da177e4 LT |
226 | } |
227 | ||
3c1c7f10 | 228 | if (used_math()) { |
75779f05 | 229 | sp -= sig_xstate_size; |
25051702 HS |
230 | #ifdef CONFIG_X86_64 |
231 | sp = round_down(sp, 64); | |
232 | #endif /* CONFIG_X86_64 */ | |
233 | *fpstate = (void __user *)sp; | |
3c1c7f10 SS |
234 | } |
235 | ||
14fc9fbc HS |
236 | sp = align_sigframe(sp - frame_size); |
237 | ||
238 | /* | |
239 | * If we are on the alternate signal stack and would overflow it, don't. | |
240 | * Return an always-bogus address instead so we will die with SIGSEGV. | |
241 | */ | |
242 | if (onsigstack && !likely(on_sig_stack(sp))) | |
243 | return (void __user *)-1L; | |
244 | ||
245 | /* save i387 state */ | |
246 | if (used_math() && save_i387_xstate(*fpstate) < 0) | |
247 | return (void __user *)-1L; | |
248 | ||
249 | return (void __user *)sp; | |
1da177e4 LT |
250 | } |
251 | ||
75779f05 HS |
252 | #ifdef CONFIG_X86_32 |
253 | static const struct { | |
254 | u16 poplmovl; | |
255 | u32 val; | |
256 | u16 int80; | |
257 | } __attribute__((packed)) retcode = { | |
258 | 0xb858, /* popl %eax; movl $..., %eax */ | |
259 | __NR_sigreturn, | |
260 | 0x80cd, /* int $0x80 */ | |
261 | }; | |
262 | ||
263 | static const struct { | |
264 | u8 movl; | |
265 | u32 val; | |
266 | u16 int80; | |
267 | u8 pad; | |
268 | } __attribute__((packed)) rt_retcode = { | |
269 | 0xb8, /* movl $..., %eax */ | |
270 | __NR_rt_sigreturn, | |
271 | 0x80cd, /* int $0x80 */ | |
272 | 0 | |
273 | }; | |
274 | ||
7e907f48 | 275 | static int |
1d13024e HS |
276 | __setup_frame(int sig, struct k_sigaction *ka, sigset_t *set, |
277 | struct pt_regs *regs) | |
1da177e4 | 278 | { |
1da177e4 | 279 | struct sigframe __user *frame; |
7e907f48 | 280 | void __user *restorer; |
1da177e4 | 281 | int err = 0; |
ab513701 | 282 | void __user *fpstate = NULL; |
1da177e4 | 283 | |
3c1c7f10 | 284 | frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate); |
1da177e4 LT |
285 | |
286 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
3d0aedd9 | 287 | return -EFAULT; |
1da177e4 | 288 | |
2ba48e16 | 289 | if (__put_user(sig, &frame->sig)) |
3d0aedd9 | 290 | return -EFAULT; |
1da177e4 | 291 | |
2ba48e16 | 292 | if (setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0])) |
3d0aedd9 | 293 | return -EFAULT; |
1da177e4 LT |
294 | |
295 | if (_NSIG_WORDS > 1) { | |
2ba48e16 HS |
296 | if (__copy_to_user(&frame->extramask, &set->sig[1], |
297 | sizeof(frame->extramask))) | |
3d0aedd9 | 298 | return -EFAULT; |
1da177e4 LT |
299 | } |
300 | ||
1a3e4ca4 | 301 | if (current->mm->context.vdso) |
6c3652ef | 302 | restorer = VDSO32_SYMBOL(current->mm->context.vdso, sigreturn); |
9fbbd4dd | 303 | else |
ade1af77 | 304 | restorer = &frame->retcode; |
1da177e4 LT |
305 | if (ka->sa.sa_flags & SA_RESTORER) |
306 | restorer = ka->sa.sa_restorer; | |
307 | ||
308 | /* Set up to return from userspace. */ | |
309 | err |= __put_user(restorer, &frame->pretcode); | |
7e907f48 | 310 | |
1da177e4 | 311 | /* |
7e907f48 | 312 | * This is popl %eax ; movl $__NR_sigreturn, %eax ; int $0x80 |
1da177e4 LT |
313 | * |
314 | * WE DO NOT USE IT ANY MORE! It's only left here for historical | |
315 | * reasons and because gdb uses it as a signature to notice | |
316 | * signal handler stack frames. | |
317 | */ | |
4a612048 | 318 | err |= __put_user(*((u64 *)&retcode), (u64 *)frame->retcode); |
1da177e4 LT |
319 | |
320 | if (err) | |
3d0aedd9 | 321 | return -EFAULT; |
1da177e4 LT |
322 | |
323 | /* Set up registers for signal handler */ | |
7e907f48 IM |
324 | regs->sp = (unsigned long)frame; |
325 | regs->ip = (unsigned long)ka->sa.sa_handler; | |
326 | regs->ax = (unsigned long)sig; | |
92bc2056 HH |
327 | regs->dx = 0; |
328 | regs->cx = 0; | |
1da177e4 | 329 | |
65ea5b03 PA |
330 | regs->ds = __USER_DS; |
331 | regs->es = __USER_DS; | |
332 | regs->ss = __USER_DS; | |
333 | regs->cs = __USER_CS; | |
1da177e4 | 334 | |
283828f3 | 335 | return 0; |
1da177e4 LT |
336 | } |
337 | ||
1d13024e HS |
338 | static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
339 | sigset_t *set, struct pt_regs *regs) | |
1da177e4 | 340 | { |
1da177e4 | 341 | struct rt_sigframe __user *frame; |
7e907f48 | 342 | void __user *restorer; |
1da177e4 | 343 | int err = 0; |
ab513701 | 344 | void __user *fpstate = NULL; |
1da177e4 | 345 | |
3c1c7f10 | 346 | frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate); |
1da177e4 LT |
347 | |
348 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
3d0aedd9 | 349 | return -EFAULT; |
1da177e4 | 350 | |
98e3d45e HS |
351 | put_user_try { |
352 | put_user_ex(sig, &frame->sig); | |
353 | put_user_ex(&frame->info, &frame->pinfo); | |
354 | put_user_ex(&frame->uc, &frame->puc); | |
355 | err |= copy_siginfo_to_user(&frame->info, info); | |
356 | ||
357 | /* Create the ucontext. */ | |
358 | if (cpu_has_xsave) | |
359 | put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags); | |
360 | else | |
361 | put_user_ex(0, &frame->uc.uc_flags); | |
362 | put_user_ex(0, &frame->uc.uc_link); | |
363 | put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
364 | put_user_ex(sas_ss_flags(regs->sp), | |
365 | &frame->uc.uc_stack.ss_flags); | |
366 | put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
367 | err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate, | |
368 | regs, set->sig[0]); | |
369 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
370 | ||
371 | /* Set up to return from userspace. */ | |
372 | restorer = VDSO32_SYMBOL(current->mm->context.vdso, rt_sigreturn); | |
373 | if (ka->sa.sa_flags & SA_RESTORER) | |
374 | restorer = ka->sa.sa_restorer; | |
375 | put_user_ex(restorer, &frame->pretcode); | |
376 | ||
377 | /* | |
378 | * This is movl $__NR_rt_sigreturn, %ax ; int $0x80 | |
379 | * | |
380 | * WE DO NOT USE IT ANY MORE! It's only left here for historical | |
381 | * reasons and because gdb uses it as a signature to notice | |
382 | * signal handler stack frames. | |
383 | */ | |
384 | put_user_ex(*((u64 *)&rt_retcode), (u64 *)frame->retcode); | |
385 | } put_user_catch(err); | |
1da177e4 LT |
386 | |
387 | if (err) | |
3d0aedd9 | 388 | return -EFAULT; |
1da177e4 LT |
389 | |
390 | /* Set up registers for signal handler */ | |
7e907f48 IM |
391 | regs->sp = (unsigned long)frame; |
392 | regs->ip = (unsigned long)ka->sa.sa_handler; | |
13ad7725 | 393 | regs->ax = (unsigned long)sig; |
7e907f48 IM |
394 | regs->dx = (unsigned long)&frame->info; |
395 | regs->cx = (unsigned long)&frame->uc; | |
1da177e4 | 396 | |
65ea5b03 PA |
397 | regs->ds = __USER_DS; |
398 | regs->es = __USER_DS; | |
399 | regs->ss = __USER_DS; | |
400 | regs->cs = __USER_CS; | |
1da177e4 | 401 | |
283828f3 | 402 | return 0; |
1da177e4 | 403 | } |
bfeb91a9 | 404 | #else /* !CONFIG_X86_32 */ |
bfeb91a9 HS |
405 | static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
406 | sigset_t *set, struct pt_regs *regs) | |
407 | { | |
408 | struct rt_sigframe __user *frame; | |
409 | void __user *fp = NULL; | |
410 | int err = 0; | |
411 | struct task_struct *me = current; | |
412 | ||
97286a2b | 413 | frame = get_sigframe(ka, regs, sizeof(struct rt_sigframe), &fp); |
bfeb91a9 HS |
414 | |
415 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
416 | return -EFAULT; | |
417 | ||
418 | if (ka->sa.sa_flags & SA_SIGINFO) { | |
419 | if (copy_siginfo_to_user(&frame->info, info)) | |
420 | return -EFAULT; | |
421 | } | |
422 | ||
98e3d45e HS |
423 | put_user_try { |
424 | /* Create the ucontext. */ | |
425 | if (cpu_has_xsave) | |
426 | put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags); | |
427 | else | |
428 | put_user_ex(0, &frame->uc.uc_flags); | |
429 | put_user_ex(0, &frame->uc.uc_link); | |
430 | put_user_ex(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
431 | put_user_ex(sas_ss_flags(regs->sp), | |
432 | &frame->uc.uc_stack.ss_flags); | |
433 | put_user_ex(me->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
434 | err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]); | |
435 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
436 | ||
437 | /* Set up to return from userspace. If provided, use a stub | |
438 | already in userspace. */ | |
439 | /* x86-64 should always use SA_RESTORER. */ | |
440 | if (ka->sa.sa_flags & SA_RESTORER) { | |
441 | put_user_ex(ka->sa.sa_restorer, &frame->pretcode); | |
442 | } else { | |
443 | /* could use a vstub here */ | |
444 | err |= -EFAULT; | |
445 | } | |
446 | } put_user_catch(err); | |
bfeb91a9 HS |
447 | |
448 | if (err) | |
449 | return -EFAULT; | |
450 | ||
451 | /* Set up registers for signal handler */ | |
452 | regs->di = sig; | |
453 | /* In case the signal handler was declared without prototypes */ | |
454 | regs->ax = 0; | |
455 | ||
456 | /* This also works for non SA_SIGINFO handlers because they expect the | |
457 | next argument after the signal number on the stack. */ | |
458 | regs->si = (unsigned long)&frame->info; | |
459 | regs->dx = (unsigned long)&frame->uc; | |
460 | regs->ip = (unsigned long) ka->sa.sa_handler; | |
461 | ||
462 | regs->sp = (unsigned long)frame; | |
463 | ||
464 | /* Set up the CS register to run signal handlers in 64-bit mode, | |
465 | even if the handler happens to be interrupting 32-bit code. */ | |
466 | regs->cs = __USER_CS; | |
467 | ||
468 | return 0; | |
469 | } | |
470 | #endif /* CONFIG_X86_32 */ | |
471 | ||
e5fa2d06 | 472 | #ifdef CONFIG_X86_32 |
bfeb91a9 HS |
473 | /* |
474 | * Atomically swap in the new signal mask, and wait for a signal. | |
475 | */ | |
476 | asmlinkage int | |
477 | sys_sigsuspend(int history0, int history1, old_sigset_t mask) | |
478 | { | |
3982294b ON |
479 | sigset_t blocked; |
480 | ||
bfeb91a9 | 481 | current->saved_sigmask = current->blocked; |
3982294b ON |
482 | |
483 | mask &= _BLOCKABLE; | |
484 | siginitset(&blocked, mask); | |
485 | set_current_blocked(&blocked); | |
bfeb91a9 HS |
486 | |
487 | current->state = TASK_INTERRUPTIBLE; | |
488 | schedule(); | |
bfeb91a9 | 489 | |
3982294b | 490 | set_restore_sigmask(); |
bfeb91a9 HS |
491 | return -ERESTARTNOHAND; |
492 | } | |
493 | ||
494 | asmlinkage int | |
495 | sys_sigaction(int sig, const struct old_sigaction __user *act, | |
496 | struct old_sigaction __user *oact) | |
497 | { | |
498 | struct k_sigaction new_ka, old_ka; | |
98e3d45e | 499 | int ret = 0; |
bfeb91a9 HS |
500 | |
501 | if (act) { | |
502 | old_sigset_t mask; | |
503 | ||
98e3d45e | 504 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) |
bfeb91a9 HS |
505 | return -EFAULT; |
506 | ||
98e3d45e HS |
507 | get_user_try { |
508 | get_user_ex(new_ka.sa.sa_handler, &act->sa_handler); | |
509 | get_user_ex(new_ka.sa.sa_flags, &act->sa_flags); | |
510 | get_user_ex(mask, &act->sa_mask); | |
511 | get_user_ex(new_ka.sa.sa_restorer, &act->sa_restorer); | |
512 | } get_user_catch(ret); | |
513 | ||
514 | if (ret) | |
515 | return -EFAULT; | |
bfeb91a9 HS |
516 | siginitset(&new_ka.sa.sa_mask, mask); |
517 | } | |
518 | ||
519 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
520 | ||
521 | if (!ret && oact) { | |
98e3d45e | 522 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) |
bfeb91a9 HS |
523 | return -EFAULT; |
524 | ||
98e3d45e HS |
525 | put_user_try { |
526 | put_user_ex(old_ka.sa.sa_handler, &oact->sa_handler); | |
527 | put_user_ex(old_ka.sa.sa_flags, &oact->sa_flags); | |
528 | put_user_ex(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); | |
529 | put_user_ex(old_ka.sa.sa_restorer, &oact->sa_restorer); | |
530 | } put_user_catch(ret); | |
531 | ||
532 | if (ret) | |
533 | return -EFAULT; | |
bfeb91a9 HS |
534 | } |
535 | ||
536 | return ret; | |
537 | } | |
e5fa2d06 | 538 | #endif /* CONFIG_X86_32 */ |
bfeb91a9 | 539 | |
052acad4 | 540 | long |
bfeb91a9 HS |
541 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, |
542 | struct pt_regs *regs) | |
543 | { | |
544 | return do_sigaltstack(uss, uoss, regs->sp); | |
545 | } | |
bfeb91a9 HS |
546 | |
547 | /* | |
548 | * Do a signal return; undo the signal stack. | |
549 | */ | |
e5fa2d06 | 550 | #ifdef CONFIG_X86_32 |
b12bdaf1 | 551 | unsigned long sys_sigreturn(struct pt_regs *regs) |
bfeb91a9 HS |
552 | { |
553 | struct sigframe __user *frame; | |
bfeb91a9 HS |
554 | unsigned long ax; |
555 | sigset_t set; | |
556 | ||
bfeb91a9 HS |
557 | frame = (struct sigframe __user *)(regs->sp - 8); |
558 | ||
559 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
560 | goto badframe; | |
561 | if (__get_user(set.sig[0], &frame->sc.oldmask) || (_NSIG_WORDS > 1 | |
562 | && __copy_from_user(&set.sig[1], &frame->extramask, | |
563 | sizeof(frame->extramask)))) | |
564 | goto badframe; | |
565 | ||
566 | sigdelsetmask(&set, ~_BLOCKABLE); | |
3982294b | 567 | set_current_blocked(&set); |
bfeb91a9 HS |
568 | |
569 | if (restore_sigcontext(regs, &frame->sc, &ax)) | |
570 | goto badframe; | |
571 | return ax; | |
572 | ||
573 | badframe: | |
ae417bb4 | 574 | signal_fault(regs, frame, "sigreturn"); |
bfeb91a9 HS |
575 | |
576 | return 0; | |
577 | } | |
e5fa2d06 | 578 | #endif /* CONFIG_X86_32 */ |
bfeb91a9 | 579 | |
74452509 | 580 | long sys_rt_sigreturn(struct pt_regs *regs) |
bfeb91a9 HS |
581 | { |
582 | struct rt_sigframe __user *frame; | |
583 | unsigned long ax; | |
584 | sigset_t set; | |
585 | ||
586 | frame = (struct rt_sigframe __user *)(regs->sp - sizeof(long)); | |
587 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
588 | goto badframe; | |
589 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
590 | goto badframe; | |
591 | ||
592 | sigdelsetmask(&set, ~_BLOCKABLE); | |
e9bd3f0f | 593 | set_current_blocked(&set); |
bfeb91a9 HS |
594 | |
595 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax)) | |
596 | goto badframe; | |
597 | ||
598 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT) | |
599 | goto badframe; | |
600 | ||
601 | return ax; | |
602 | ||
603 | badframe: | |
604 | signal_fault(regs, frame, "rt_sigreturn"); | |
605 | return 0; | |
606 | } | |
607 | ||
1da177e4 | 608 | /* |
7e907f48 IM |
609 | * OK, we're invoking a handler: |
610 | */ | |
8d8c13bd HS |
611 | static int signr_convert(int sig) |
612 | { | |
96bf84b7 | 613 | #ifdef CONFIG_X86_32 |
8d8c13bd HS |
614 | struct thread_info *info = current_thread_info(); |
615 | ||
616 | if (info->exec_domain && info->exec_domain->signal_invmap && sig < 32) | |
617 | return info->exec_domain->signal_invmap[sig]; | |
96bf84b7 | 618 | #endif /* CONFIG_X86_32 */ |
8d8c13bd HS |
619 | return sig; |
620 | } | |
621 | ||
cabf5035 HS |
622 | #ifdef CONFIG_X86_32 |
623 | ||
455edbc4 | 624 | #define is_ia32 1 |
4694d239 HS |
625 | #define ia32_setup_frame __setup_frame |
626 | #define ia32_setup_rt_frame __setup_rt_frame | |
455edbc4 | 627 | |
cabf5035 HS |
628 | #else /* !CONFIG_X86_32 */ |
629 | ||
630 | #ifdef CONFIG_IA32_EMULATION | |
631 | #define is_ia32 test_thread_flag(TIF_IA32) | |
632 | #else /* !CONFIG_IA32_EMULATION */ | |
633 | #define is_ia32 0 | |
634 | #endif /* CONFIG_IA32_EMULATION */ | |
635 | ||
c5a37394 PA |
636 | #ifdef CONFIG_X86_X32_ABI |
637 | #define is_x32 test_thread_flag(TIF_X32) | |
638 | ||
639 | static int x32_setup_rt_frame(int sig, struct k_sigaction *ka, | |
640 | siginfo_t *info, compat_sigset_t *set, | |
641 | struct pt_regs *regs); | |
642 | #else /* !CONFIG_X86_X32_ABI */ | |
643 | #define is_x32 0 | |
644 | #endif /* CONFIG_X86_X32_ABI */ | |
645 | ||
f5223763 HS |
646 | int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
647 | sigset_t *set, struct pt_regs *regs); | |
648 | int ia32_setup_frame(int sig, struct k_sigaction *ka, | |
649 | sigset_t *set, struct pt_regs *regs); | |
650 | ||
cabf5035 HS |
651 | #endif /* CONFIG_X86_32 */ |
652 | ||
1d13024e HS |
653 | static int |
654 | setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, | |
9b429620 | 655 | struct pt_regs *regs) |
1d13024e | 656 | { |
8d8c13bd | 657 | int usig = signr_convert(sig); |
9b429620 | 658 | sigset_t *set = ¤t->blocked; |
1d13024e HS |
659 | int ret; |
660 | ||
9b429620 ON |
661 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) |
662 | set = ¤t->saved_sigmask; | |
663 | ||
1d13024e | 664 | /* Set up the stack frame */ |
455edbc4 HS |
665 | if (is_ia32) { |
666 | if (ka->sa.sa_flags & SA_SIGINFO) | |
4694d239 | 667 | ret = ia32_setup_rt_frame(usig, ka, info, set, regs); |
455edbc4 | 668 | else |
4694d239 | 669 | ret = ia32_setup_frame(usig, ka, set, regs); |
c5a37394 PA |
670 | #ifdef CONFIG_X86_X32_ABI |
671 | } else if (is_x32) { | |
672 | ret = x32_setup_rt_frame(usig, ka, info, | |
673 | (compat_sigset_t *)set, regs); | |
674 | #endif | |
675 | } else { | |
455edbc4 | 676 | ret = __setup_rt_frame(sig, ka, info, set, regs); |
c5a37394 | 677 | } |
1d13024e | 678 | |
3d0aedd9 HS |
679 | if (ret) { |
680 | force_sigsegv(sig, current); | |
681 | return -EFAULT; | |
682 | } | |
683 | ||
9b429620 | 684 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; |
1d13024e HS |
685 | return ret; |
686 | } | |
687 | ||
7c1def16 | 688 | static int |
1da177e4 | 689 | handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, |
9b429620 | 690 | struct pt_regs *regs) |
1da177e4 | 691 | { |
7c1def16 RM |
692 | int ret; |
693 | ||
1da177e4 | 694 | /* Are we from a system call? */ |
bb57925f | 695 | if (syscall_get_nr(current, regs) >= 0) { |
1da177e4 | 696 | /* If so, check system call restarting.. */ |
bb57925f | 697 | switch (syscall_get_error(current, regs)) { |
ac66f3fd HH |
698 | case -ERESTART_RESTARTBLOCK: |
699 | case -ERESTARTNOHAND: | |
700 | regs->ax = -EINTR; | |
701 | break; | |
702 | ||
703 | case -ERESTARTSYS: | |
704 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
65ea5b03 | 705 | regs->ax = -EINTR; |
1da177e4 | 706 | break; |
ac66f3fd HH |
707 | } |
708 | /* fallthrough */ | |
709 | case -ERESTARTNOINTR: | |
710 | regs->ax = regs->orig_ax; | |
711 | regs->ip -= 2; | |
712 | break; | |
1da177e4 LT |
713 | } |
714 | } | |
715 | ||
716 | /* | |
e1f28773 RM |
717 | * If TF is set due to a debugger (TIF_FORCED_TF), clear the TF |
718 | * flag so that register information in the sigcontext is correct. | |
1da177e4 | 719 | */ |
65ea5b03 | 720 | if (unlikely(regs->flags & X86_EFLAGS_TF) && |
e1f28773 | 721 | likely(test_and_clear_thread_flag(TIF_FORCED_TF))) |
65ea5b03 | 722 | regs->flags &= ~X86_EFLAGS_TF; |
1da177e4 | 723 | |
9b429620 | 724 | ret = setup_rt_frame(sig, ka, info, regs); |
1da177e4 | 725 | |
7e907f48 IM |
726 | if (ret) |
727 | return ret; | |
7c1def16 | 728 | |
8b9c5ff3 RM |
729 | /* |
730 | * Clear the direction flag as per the ABI for function entry. | |
731 | */ | |
732 | regs->flags &= ~X86_EFLAGS_DF; | |
733 | ||
734 | /* | |
735 | * Clear TF when entering the signal handler, but | |
736 | * notify any tracer that was single-stepping it. | |
737 | * The tracer may want to single-step inside the | |
738 | * handler too. | |
739 | */ | |
740 | regs->flags &= ~X86_EFLAGS_TF; | |
8b9c5ff3 | 741 | |
5e6292c0 | 742 | block_sigmask(ka, sig); |
7e907f48 | 743 | |
36a03308 RM |
744 | tracehook_signal_handler(sig, info, ka, regs, |
745 | test_thread_flag(TIF_SINGLESTEP)); | |
746 | ||
7e907f48 | 747 | return 0; |
1da177e4 LT |
748 | } |
749 | ||
57917752 | 750 | #ifdef CONFIG_X86_32 |
8fcd8e20 | 751 | #define NR_restart_syscall __NR_restart_syscall |
57917752 HS |
752 | #else /* !CONFIG_X86_32 */ |
753 | #define NR_restart_syscall \ | |
754 | test_thread_flag(TIF_IA32) ? __NR_ia32_restart_syscall : __NR_restart_syscall | |
755 | #endif /* CONFIG_X86_32 */ | |
756 | ||
1da177e4 LT |
757 | /* |
758 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
759 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
760 | * mistake. | |
761 | */ | |
75604d7f | 762 | static void do_signal(struct pt_regs *regs) |
1da177e4 | 763 | { |
ac66f3fd | 764 | struct k_sigaction ka; |
1da177e4 LT |
765 | siginfo_t info; |
766 | int signr; | |
1da177e4 LT |
767 | |
768 | /* | |
ac66f3fd HH |
769 | * We want the common case to go fast, which is why we may in certain |
770 | * cases get here from kernel mode. Just return without doing anything | |
771 | * if so. | |
772 | * X86_32: vm86 regs switched out by assembly code before reaching | |
773 | * here, so testing against kernel CS suffices. | |
1da177e4 | 774 | */ |
717b594a | 775 | if (!user_mode(regs)) |
283828f3 | 776 | return; |
1da177e4 | 777 | |
1da177e4 LT |
778 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
779 | if (signr > 0) { | |
7e907f48 | 780 | /* Whee! Actually deliver the signal. */ |
9b429620 | 781 | handle_signal(signr, &info, &ka, regs); |
283828f3 | 782 | return; |
1da177e4 LT |
783 | } |
784 | ||
1da177e4 | 785 | /* Did we come from a system call? */ |
bb57925f | 786 | if (syscall_get_nr(current, regs) >= 0) { |
1da177e4 | 787 | /* Restart the system call - no handlers present */ |
bb57925f | 788 | switch (syscall_get_error(current, regs)) { |
283828f3 DH |
789 | case -ERESTARTNOHAND: |
790 | case -ERESTARTSYS: | |
791 | case -ERESTARTNOINTR: | |
65ea5b03 PA |
792 | regs->ax = regs->orig_ax; |
793 | regs->ip -= 2; | |
283828f3 DH |
794 | break; |
795 | ||
796 | case -ERESTART_RESTARTBLOCK: | |
8fcd8e20 | 797 | regs->ax = NR_restart_syscall; |
65ea5b03 | 798 | regs->ip -= 2; |
283828f3 | 799 | break; |
1da177e4 LT |
800 | } |
801 | } | |
283828f3 | 802 | |
ac66f3fd HH |
803 | /* |
804 | * If there's no signal to deliver, we just put the saved sigmask | |
805 | * back. | |
806 | */ | |
5a8da0ea RM |
807 | if (current_thread_info()->status & TS_RESTORE_SIGMASK) { |
808 | current_thread_info()->status &= ~TS_RESTORE_SIGMASK; | |
9b429620 | 809 | set_current_blocked(¤t->saved_sigmask); |
283828f3 | 810 | } |
1da177e4 LT |
811 | } |
812 | ||
813 | /* | |
814 | * notification of userspace execution resumption | |
283828f3 | 815 | * - triggered by the TIF_WORK_MASK flags |
1da177e4 | 816 | */ |
7e907f48 IM |
817 | void |
818 | do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags) | |
1da177e4 | 819 | { |
c1ebf835 | 820 | #ifdef CONFIG_X86_MCE |
ee847c54 HS |
821 | /* notify userspace of pending MCEs */ |
822 | if (thread_info_flags & _TIF_MCE_NOTIFY) | |
9b1beaf2 | 823 | mce_notify_process(); |
ee847c54 HS |
824 | #endif /* CONFIG_X86_64 && CONFIG_X86_MCE */ |
825 | ||
1da177e4 | 826 | /* deal with pending signal delivery */ |
5a8da0ea | 827 | if (thread_info_flags & _TIF_SIGPENDING) |
283828f3 | 828 | do_signal(regs); |
8f4d37ec | 829 | |
59e52130 RM |
830 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { |
831 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
832 | tracehook_notify_resume(regs); | |
ee18d64c DH |
833 | if (current->replacement_session_keyring) |
834 | key_replace_session_keyring(); | |
59e52130 | 835 | } |
7c68af6e AK |
836 | if (thread_info_flags & _TIF_USER_RETURN_NOTIFY) |
837 | fire_user_return_notifiers(); | |
59e52130 | 838 | |
ee847c54 | 839 | #ifdef CONFIG_X86_32 |
1da177e4 | 840 | clear_thread_flag(TIF_IRET); |
ee847c54 | 841 | #endif /* CONFIG_X86_32 */ |
1da177e4 | 842 | } |
72fa50f4 HS |
843 | |
844 | void signal_fault(struct pt_regs *regs, void __user *frame, char *where) | |
845 | { | |
846 | struct task_struct *me = current; | |
847 | ||
848 | if (show_unhandled_signals && printk_ratelimit()) { | |
ae417bb4 | 849 | printk("%s" |
72fa50f4 | 850 | "%s[%d] bad frame in %s frame:%p ip:%lx sp:%lx orax:%lx", |
ae417bb4 | 851 | task_pid_nr(current) > 1 ? KERN_INFO : KERN_EMERG, |
72fa50f4 HS |
852 | me->comm, me->pid, where, frame, |
853 | regs->ip, regs->sp, regs->orig_ax); | |
854 | print_vma_addr(" in ", regs->ip); | |
855 | printk(KERN_CONT "\n"); | |
856 | } | |
857 | ||
858 | force_sig(SIGSEGV, me); | |
859 | } | |
c5a37394 PA |
860 | |
861 | #ifdef CONFIG_X86_X32_ABI | |
862 | static int x32_setup_rt_frame(int sig, struct k_sigaction *ka, | |
863 | siginfo_t *info, compat_sigset_t *set, | |
864 | struct pt_regs *regs) | |
865 | { | |
866 | struct rt_sigframe_x32 __user *frame; | |
867 | void __user *restorer; | |
868 | int err = 0; | |
869 | void __user *fpstate = NULL; | |
870 | ||
871 | frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate); | |
872 | ||
873 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
874 | return -EFAULT; | |
875 | ||
876 | if (ka->sa.sa_flags & SA_SIGINFO) { | |
877 | if (copy_siginfo_to_user32(&frame->info, info)) | |
878 | return -EFAULT; | |
879 | } | |
880 | ||
881 | put_user_try { | |
882 | /* Create the ucontext. */ | |
883 | if (cpu_has_xsave) | |
884 | put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags); | |
885 | else | |
886 | put_user_ex(0, &frame->uc.uc_flags); | |
887 | put_user_ex(0, &frame->uc.uc_link); | |
888 | put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
889 | put_user_ex(sas_ss_flags(regs->sp), | |
890 | &frame->uc.uc_stack.ss_flags); | |
891 | put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
892 | put_user_ex(0, &frame->uc.uc__pad0); | |
893 | err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate, | |
894 | regs, set->sig[0]); | |
895 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
896 | ||
897 | if (ka->sa.sa_flags & SA_RESTORER) { | |
898 | restorer = ka->sa.sa_restorer; | |
899 | } else { | |
900 | /* could use a vstub here */ | |
901 | restorer = NULL; | |
902 | err |= -EFAULT; | |
903 | } | |
904 | put_user_ex(restorer, &frame->pretcode); | |
905 | } put_user_catch(err); | |
906 | ||
907 | if (err) | |
908 | return -EFAULT; | |
909 | ||
910 | /* Set up registers for signal handler */ | |
911 | regs->sp = (unsigned long) frame; | |
912 | regs->ip = (unsigned long) ka->sa.sa_handler; | |
913 | ||
914 | /* We use the x32 calling convention here... */ | |
915 | regs->di = sig; | |
916 | regs->si = (unsigned long) &frame->info; | |
917 | regs->dx = (unsigned long) &frame->uc; | |
918 | ||
919 | loadsegment(ds, __USER_DS); | |
920 | loadsegment(es, __USER_DS); | |
921 | ||
922 | regs->cs = __USER_CS; | |
923 | regs->ss = __USER_DS; | |
924 | ||
925 | return 0; | |
926 | } | |
927 | ||
928 | asmlinkage long sys32_x32_rt_sigreturn(struct pt_regs *regs) | |
929 | { | |
930 | struct rt_sigframe_x32 __user *frame; | |
931 | sigset_t set; | |
932 | unsigned long ax; | |
933 | struct pt_regs tregs; | |
934 | ||
935 | frame = (struct rt_sigframe_x32 __user *)(regs->sp - 8); | |
936 | ||
937 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
938 | goto badframe; | |
939 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
940 | goto badframe; | |
941 | ||
942 | sigdelsetmask(&set, ~_BLOCKABLE); | |
943 | set_current_blocked(&set); | |
944 | ||
945 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax)) | |
946 | goto badframe; | |
947 | ||
948 | tregs = *regs; | |
949 | if (sys32_sigaltstack(&frame->uc.uc_stack, NULL, &tregs) == -EFAULT) | |
950 | goto badframe; | |
951 | ||
952 | return ax; | |
953 | ||
954 | badframe: | |
955 | signal_fault(regs, frame, "x32 rt_sigreturn"); | |
956 | return 0; | |
957 | } | |
958 | #endif |