Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/x86_64/ia32/ia32_signal.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * | |
6 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson | |
7 | * 2000-06-20 Pentium III FXSR, SSE support by Gareth Hughes | |
8 | * 2000-12-* x86-64 compatibility mode signal handling by Andi Kleen | |
1da177e4 LT |
9 | */ |
10 | ||
11 | #include <linux/sched.h> | |
12 | #include <linux/mm.h> | |
13 | #include <linux/smp.h> | |
1da177e4 LT |
14 | #include <linux/kernel.h> |
15 | #include <linux/signal.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/wait.h> | |
18 | #include <linux/ptrace.h> | |
19 | #include <linux/unistd.h> | |
20 | #include <linux/stddef.h> | |
21 | #include <linux/personality.h> | |
22 | #include <linux/compat.h> | |
9fbbd4dd | 23 | #include <linux/binfmts.h> |
1da177e4 LT |
24 | #include <asm/ucontext.h> |
25 | #include <asm/uaccess.h> | |
26 | #include <asm/i387.h> | |
27 | #include <asm/ia32.h> | |
28 | #include <asm/ptrace.h> | |
29 | #include <asm/ia32_unistd.h> | |
30 | #include <asm/user32.h> | |
31 | #include <asm/sigcontext32.h> | |
1da177e4 | 32 | #include <asm/proto.h> |
af65d648 | 33 | #include <asm/vdso.h> |
1da177e4 LT |
34 | |
35 | #define DEBUG_SIG 0 | |
36 | ||
37 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
38 | ||
fbdb7da9 HS |
39 | #define FIX_EFLAGS (X86_EFLAGS_AC | X86_EFLAGS_OF | \ |
40 | X86_EFLAGS_DF | X86_EFLAGS_TF | X86_EFLAGS_SF | \ | |
41 | X86_EFLAGS_ZF | X86_EFLAGS_AF | X86_EFLAGS_PF | \ | |
42 | X86_EFLAGS_CF) | |
43 | ||
1da177e4 LT |
44 | asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset); |
45 | void signal_fault(struct pt_regs *regs, void __user *frame, char *where); | |
46 | ||
47 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) | |
48 | { | |
49 | int err; | |
99b9cdf7 TG |
50 | |
51 | if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t))) | |
1da177e4 LT |
52 | return -EFAULT; |
53 | ||
54 | /* If you change siginfo_t structure, please make sure that | |
55 | this code is fixed accordingly. | |
56 | It should never copy any pad contained in the structure | |
57 | to avoid security leaks, but must copy the generic | |
58 | 3 ints plus the relevant union member. */ | |
59 | err = __put_user(from->si_signo, &to->si_signo); | |
60 | err |= __put_user(from->si_errno, &to->si_errno); | |
99b9cdf7 | 61 | err |= __put_user((short)from->si_code, &to->si_code); |
1da177e4 LT |
62 | |
63 | if (from->si_code < 0) { | |
64 | err |= __put_user(from->si_pid, &to->si_pid); | |
99b9cdf7 TG |
65 | err |= __put_user(from->si_uid, &to->si_uid); |
66 | err |= __put_user(ptr_to_compat(from->si_ptr), &to->si_ptr); | |
1da177e4 | 67 | } else { |
99b9cdf7 TG |
68 | /* |
69 | * First 32bits of unions are always present: | |
70 | * si_pid === si_band === si_tid === si_addr(LS half) | |
71 | */ | |
72 | err |= __put_user(from->_sifields._pad[0], | |
73 | &to->_sifields._pad[0]); | |
1da177e4 LT |
74 | switch (from->si_code >> 16) { |
75 | case __SI_FAULT >> 16: | |
76 | break; | |
77 | case __SI_CHLD >> 16: | |
78 | err |= __put_user(from->si_utime, &to->si_utime); | |
79 | err |= __put_user(from->si_stime, &to->si_stime); | |
80 | err |= __put_user(from->si_status, &to->si_status); | |
81 | /* FALL THROUGH */ | |
82 | default: | |
83 | case __SI_KILL >> 16: | |
84 | err |= __put_user(from->si_uid, &to->si_uid); | |
85 | break; | |
86 | case __SI_POLL >> 16: | |
99b9cdf7 | 87 | err |= __put_user(from->si_fd, &to->si_fd); |
1da177e4 LT |
88 | break; |
89 | case __SI_TIMER >> 16: | |
99b9cdf7 | 90 | err |= __put_user(from->si_overrun, &to->si_overrun); |
1da177e4 | 91 | err |= __put_user(ptr_to_compat(from->si_ptr), |
99b9cdf7 | 92 | &to->si_ptr); |
1da177e4 | 93 | break; |
99b9cdf7 TG |
94 | /* This is not generated by the kernel as of now. */ |
95 | case __SI_RT >> 16: | |
1da177e4 LT |
96 | case __SI_MESGQ >> 16: |
97 | err |= __put_user(from->si_uid, &to->si_uid); | |
98 | err |= __put_user(from->si_int, &to->si_int); | |
99 | break; | |
100 | } | |
101 | } | |
102 | return err; | |
103 | } | |
104 | ||
105 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) | |
106 | { | |
107 | int err; | |
108 | u32 ptr32; | |
99b9cdf7 TG |
109 | |
110 | if (!access_ok(VERIFY_READ, from, sizeof(compat_siginfo_t))) | |
1da177e4 LT |
111 | return -EFAULT; |
112 | ||
113 | err = __get_user(to->si_signo, &from->si_signo); | |
114 | err |= __get_user(to->si_errno, &from->si_errno); | |
115 | err |= __get_user(to->si_code, &from->si_code); | |
116 | ||
117 | err |= __get_user(to->si_pid, &from->si_pid); | |
118 | err |= __get_user(to->si_uid, &from->si_uid); | |
119 | err |= __get_user(ptr32, &from->si_ptr); | |
120 | to->si_ptr = compat_ptr(ptr32); | |
121 | ||
122 | return err; | |
123 | } | |
124 | ||
99b9cdf7 | 125 | asmlinkage long sys32_sigsuspend(int history0, int history1, old_sigset_t mask) |
1da177e4 | 126 | { |
1da177e4 LT |
127 | mask &= _BLOCKABLE; |
128 | spin_lock_irq(¤t->sighand->siglock); | |
1d001df1 | 129 | current->saved_sigmask = current->blocked; |
1da177e4 LT |
130 | siginitset(¤t->blocked, mask); |
131 | recalc_sigpending(); | |
132 | spin_unlock_irq(¤t->sighand->siglock); | |
133 | ||
1d001df1 AK |
134 | current->state = TASK_INTERRUPTIBLE; |
135 | schedule(); | |
5a8da0ea | 136 | set_restore_sigmask(); |
1d001df1 | 137 | return -ERESTARTNOHAND; |
1da177e4 LT |
138 | } |
139 | ||
99b9cdf7 TG |
140 | asmlinkage long sys32_sigaltstack(const stack_ia32_t __user *uss_ptr, |
141 | stack_ia32_t __user *uoss_ptr, | |
142 | struct pt_regs *regs) | |
1da177e4 | 143 | { |
99b9cdf7 | 144 | stack_t uss, uoss; |
1da177e4 | 145 | int ret; |
99b9cdf7 TG |
146 | mm_segment_t seg; |
147 | ||
148 | if (uss_ptr) { | |
1da177e4 | 149 | u32 ptr; |
99b9cdf7 TG |
150 | |
151 | memset(&uss, 0, sizeof(stack_t)); | |
152 | if (!access_ok(VERIFY_READ, uss_ptr, sizeof(stack_ia32_t)) || | |
1da177e4 LT |
153 | __get_user(ptr, &uss_ptr->ss_sp) || |
154 | __get_user(uss.ss_flags, &uss_ptr->ss_flags) || | |
155 | __get_user(uss.ss_size, &uss_ptr->ss_size)) | |
156 | return -EFAULT; | |
157 | uss.ss_sp = compat_ptr(ptr); | |
158 | } | |
99b9cdf7 TG |
159 | seg = get_fs(); |
160 | set_fs(KERNEL_DS); | |
65ea5b03 | 161 | ret = do_sigaltstack(uss_ptr ? &uss : NULL, &uoss, regs->sp); |
99b9cdf7 | 162 | set_fs(seg); |
1da177e4 | 163 | if (ret >= 0 && uoss_ptr) { |
99b9cdf7 | 164 | if (!access_ok(VERIFY_WRITE, uoss_ptr, sizeof(stack_ia32_t)) || |
1da177e4 LT |
165 | __put_user(ptr_to_compat(uoss.ss_sp), &uoss_ptr->ss_sp) || |
166 | __put_user(uoss.ss_flags, &uoss_ptr->ss_flags) || | |
167 | __put_user(uoss.ss_size, &uoss_ptr->ss_size)) | |
168 | ret = -EFAULT; | |
99b9cdf7 TG |
169 | } |
170 | return ret; | |
1da177e4 LT |
171 | } |
172 | ||
173 | /* | |
174 | * Do a signal return; undo the signal stack. | |
175 | */ | |
176 | ||
177 | struct sigframe | |
178 | { | |
179 | u32 pretcode; | |
180 | int sig; | |
181 | struct sigcontext_ia32 sc; | |
3c1c7f10 | 182 | struct _fpstate_ia32 fpstate_unused; /* look at kernel/sigframe.h */ |
1da177e4 LT |
183 | unsigned int extramask[_COMPAT_NSIG_WORDS-1]; |
184 | char retcode[8]; | |
3c1c7f10 | 185 | /* fp state follows here */ |
1da177e4 LT |
186 | }; |
187 | ||
188 | struct rt_sigframe | |
189 | { | |
190 | u32 pretcode; | |
191 | int sig; | |
192 | u32 pinfo; | |
193 | u32 puc; | |
194 | compat_siginfo_t info; | |
195 | struct ucontext_ia32 uc; | |
1da177e4 | 196 | char retcode[8]; |
3c1c7f10 | 197 | /* fp state follows here */ |
1da177e4 LT |
198 | }; |
199 | ||
b78a5b52 HS |
200 | #define COPY(x) { \ |
201 | err |= __get_user(regs->x, &sc->x); \ | |
1da177e4 LT |
202 | } |
203 | ||
d71a68dc HS |
204 | #define COPY_SEG_CPL3(seg) { \ |
205 | unsigned short tmp; \ | |
206 | err |= __get_user(tmp, &sc->seg); \ | |
207 | regs->seg = tmp | 3; \ | |
208 | } | |
209 | ||
8c6e5ce0 HS |
210 | #define RELOAD_SEG(seg) { \ |
211 | unsigned int cur, pre; \ | |
212 | err |= __get_user(pre, &sc->seg); \ | |
213 | savesegment(seg, cur); \ | |
214 | pre |= 3; \ | |
215 | if (pre != cur) \ | |
216 | loadsegment(seg, pre); \ | |
217 | } | |
99b9cdf7 TG |
218 | |
219 | static int ia32_restore_sigcontext(struct pt_regs *regs, | |
220 | struct sigcontext_ia32 __user *sc, | |
221 | unsigned int *peax) | |
222 | { | |
223 | unsigned int tmpflags, gs, oldgs, err = 0; | |
ab513701 | 224 | void __user *buf; |
99b9cdf7 TG |
225 | u32 tmp; |
226 | ||
227 | /* Always make any pending restarted system calls return -EINTR */ | |
228 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
229 | ||
230 | #if DEBUG_SIG | |
231 | printk(KERN_DEBUG "SIG restore_sigcontext: " | |
232 | "sc=%p err(%x) eip(%x) cs(%x) flg(%x)\n", | |
65ea5b03 | 233 | sc, sc->err, sc->ip, sc->cs, sc->flags); |
99b9cdf7 TG |
234 | #endif |
235 | ||
236 | /* | |
237 | * Reload fs and gs if they have changed in the signal | |
238 | * handler. This does not handle long fs/gs base changes in | |
239 | * the handler, but does not clobber them at least in the | |
240 | * normal case. | |
241 | */ | |
242 | err |= __get_user(gs, &sc->gs); | |
243 | gs |= 3; | |
b6edbb1e | 244 | savesegment(gs, oldgs); |
99b9cdf7 TG |
245 | if (gs != oldgs) |
246 | load_gs_index(gs); | |
247 | ||
8c6e5ce0 HS |
248 | RELOAD_SEG(fs); |
249 | RELOAD_SEG(ds); | |
250 | RELOAD_SEG(es); | |
1da177e4 LT |
251 | |
252 | COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx); | |
253 | COPY(dx); COPY(cx); COPY(ip); | |
99b9cdf7 TG |
254 | /* Don't touch extended registers */ |
255 | ||
d71a68dc HS |
256 | COPY_SEG_CPL3(cs); |
257 | COPY_SEG_CPL3(ss); | |
99b9cdf7 | 258 | |
742fa54a | 259 | err |= __get_user(tmpflags, &sc->flags); |
fbdb7da9 | 260 | regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS); |
99b9cdf7 | 261 | /* disable syscall checks */ |
65ea5b03 | 262 | regs->orig_ax = -1; |
99b9cdf7 TG |
263 | |
264 | err |= __get_user(tmp, &sc->fpstate); | |
265 | buf = compat_ptr(tmp); | |
ab513701 | 266 | err |= restore_i387_xstate_ia32(buf); |
1da177e4 | 267 | |
742fa54a | 268 | err |= __get_user(tmp, &sc->ax); |
99b9cdf7 TG |
269 | *peax = tmp; |
270 | ||
1da177e4 | 271 | return err; |
1da177e4 LT |
272 | } |
273 | ||
274 | asmlinkage long sys32_sigreturn(struct pt_regs *regs) | |
275 | { | |
65ea5b03 | 276 | struct sigframe __user *frame = (struct sigframe __user *)(regs->sp-8); |
1da177e4 | 277 | sigset_t set; |
65ea5b03 | 278 | unsigned int ax; |
1da177e4 LT |
279 | |
280 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
281 | goto badframe; | |
282 | if (__get_user(set.sig[0], &frame->sc.oldmask) | |
283 | || (_COMPAT_NSIG_WORDS > 1 | |
99b9cdf7 TG |
284 | && __copy_from_user((((char *) &set.sig) + 4), |
285 | &frame->extramask, | |
1da177e4 LT |
286 | sizeof(frame->extramask)))) |
287 | goto badframe; | |
288 | ||
289 | sigdelsetmask(&set, ~_BLOCKABLE); | |
290 | spin_lock_irq(¤t->sighand->siglock); | |
291 | current->blocked = set; | |
292 | recalc_sigpending(); | |
293 | spin_unlock_irq(¤t->sighand->siglock); | |
99b9cdf7 | 294 | |
65ea5b03 | 295 | if (ia32_restore_sigcontext(regs, &frame->sc, &ax)) |
1da177e4 | 296 | goto badframe; |
65ea5b03 | 297 | return ax; |
1da177e4 LT |
298 | |
299 | badframe: | |
300 | signal_fault(regs, frame, "32bit sigreturn"); | |
301 | return 0; | |
99b9cdf7 | 302 | } |
1da177e4 LT |
303 | |
304 | asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs) | |
305 | { | |
306 | struct rt_sigframe __user *frame; | |
307 | sigset_t set; | |
65ea5b03 | 308 | unsigned int ax; |
1da177e4 LT |
309 | struct pt_regs tregs; |
310 | ||
65ea5b03 | 311 | frame = (struct rt_sigframe __user *)(regs->sp - 4); |
1da177e4 LT |
312 | |
313 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
314 | goto badframe; | |
315 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
316 | goto badframe; | |
317 | ||
318 | sigdelsetmask(&set, ~_BLOCKABLE); | |
319 | spin_lock_irq(¤t->sighand->siglock); | |
320 | current->blocked = set; | |
321 | recalc_sigpending(); | |
322 | spin_unlock_irq(¤t->sighand->siglock); | |
99b9cdf7 | 323 | |
65ea5b03 | 324 | if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax)) |
1da177e4 LT |
325 | goto badframe; |
326 | ||
327 | tregs = *regs; | |
328 | if (sys32_sigaltstack(&frame->uc.uc_stack, NULL, &tregs) == -EFAULT) | |
329 | goto badframe; | |
330 | ||
65ea5b03 | 331 | return ax; |
1da177e4 LT |
332 | |
333 | badframe: | |
99b9cdf7 | 334 | signal_fault(regs, frame, "32bit rt sigreturn"); |
1da177e4 | 335 | return 0; |
99b9cdf7 | 336 | } |
1da177e4 LT |
337 | |
338 | /* | |
339 | * Set up a signal frame. | |
340 | */ | |
341 | ||
99b9cdf7 | 342 | static int ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc, |
ab513701 | 343 | void __user *fpstate, |
99b9cdf7 | 344 | struct pt_regs *regs, unsigned int mask) |
1da177e4 LT |
345 | { |
346 | int tmp, err = 0; | |
1da177e4 | 347 | |
b6edbb1e | 348 | savesegment(gs, tmp); |
1da177e4 | 349 | err |= __put_user(tmp, (unsigned int __user *)&sc->gs); |
b6edbb1e | 350 | savesegment(fs, tmp); |
1da177e4 | 351 | err |= __put_user(tmp, (unsigned int __user *)&sc->fs); |
b6edbb1e | 352 | savesegment(ds, tmp); |
1da177e4 | 353 | err |= __put_user(tmp, (unsigned int __user *)&sc->ds); |
b6edbb1e | 354 | savesegment(es, tmp); |
1da177e4 LT |
355 | err |= __put_user(tmp, (unsigned int __user *)&sc->es); |
356 | ||
bff0aa4b HS |
357 | err |= __put_user(regs->di, &sc->di); |
358 | err |= __put_user(regs->si, &sc->si); | |
359 | err |= __put_user(regs->bp, &sc->bp); | |
360 | err |= __put_user(regs->sp, &sc->sp); | |
361 | err |= __put_user(regs->bx, &sc->bx); | |
362 | err |= __put_user(regs->dx, &sc->dx); | |
363 | err |= __put_user(regs->cx, &sc->cx); | |
364 | err |= __put_user(regs->ax, &sc->ax); | |
365 | err |= __put_user(regs->cs, &sc->cs); | |
366 | err |= __put_user(regs->ss, &sc->ss); | |
1da177e4 LT |
367 | err |= __put_user(current->thread.trap_no, &sc->trapno); |
368 | err |= __put_user(current->thread.error_code, &sc->err); | |
bff0aa4b HS |
369 | err |= __put_user(regs->ip, &sc->ip); |
370 | err |= __put_user(regs->flags, &sc->flags); | |
371 | err |= __put_user(regs->sp, &sc->sp_at_signal); | |
1da177e4 | 372 | |
99ea1b93 | 373 | err |= __put_user(ptr_to_compat(fpstate), &sc->fpstate); |
1da177e4 LT |
374 | |
375 | /* non-iBCS2 extensions.. */ | |
376 | err |= __put_user(mask, &sc->oldmask); | |
377 | err |= __put_user(current->thread.cr2, &sc->cr2); | |
378 | ||
379 | return err; | |
380 | } | |
381 | ||
382 | /* | |
383 | * Determine which stack to use.. | |
384 | */ | |
99b9cdf7 | 385 | static void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, |
3c1c7f10 | 386 | size_t frame_size, |
ab513701 | 387 | void **fpstate) |
1da177e4 | 388 | { |
65ea5b03 | 389 | unsigned long sp; |
1da177e4 LT |
390 | |
391 | /* Default to using normal stack */ | |
65ea5b03 | 392 | sp = regs->sp; |
1da177e4 LT |
393 | |
394 | /* This is the X/Open sanctioned signal stack switching. */ | |
395 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
65ea5b03 PA |
396 | if (sas_ss_flags(sp) == 0) |
397 | sp = current->sas_ss_sp + current->sas_ss_size; | |
1da177e4 LT |
398 | } |
399 | ||
400 | /* This is the legacy signal stack switching. */ | |
401 | else if ((regs->ss & 0xffff) != __USER_DS && | |
402 | !(ka->sa.sa_flags & SA_RESTORER) && | |
99b9cdf7 | 403 | ka->sa.sa_restorer) |
65ea5b03 | 404 | sp = (unsigned long) ka->sa.sa_restorer; |
1da177e4 | 405 | |
3c1c7f10 SS |
406 | if (used_math()) { |
407 | sp = sp - sig_xstate_ia32_size; | |
408 | *fpstate = (struct _fpstate_ia32 *) sp; | |
99ea1b93 HS |
409 | if (save_i387_xstate_ia32(*fpstate) < 0) |
410 | return (void __user *) -1L; | |
3c1c7f10 SS |
411 | } |
412 | ||
65ea5b03 | 413 | sp -= frame_size; |
d347f372 MO |
414 | /* Align the stack pointer according to the i386 ABI, |
415 | * i.e. so that on function entry ((sp + 4) & 15) == 0. */ | |
65ea5b03 PA |
416 | sp = ((sp + 4) & -16ul) - 4; |
417 | return (void __user *) sp; | |
1da177e4 LT |
418 | } |
419 | ||
0928d6ef | 420 | int ia32_setup_frame(int sig, struct k_sigaction *ka, |
99b9cdf7 | 421 | compat_sigset_t *set, struct pt_regs *regs) |
1da177e4 LT |
422 | { |
423 | struct sigframe __user *frame; | |
99b9cdf7 | 424 | void __user *restorer; |
1da177e4 | 425 | int err = 0; |
ab513701 | 426 | void __user *fpstate = NULL; |
1da177e4 | 427 | |
99b9cdf7 TG |
428 | /* copy_to_user optimizes that into a single 8 byte store */ |
429 | static const struct { | |
430 | u16 poplmovl; | |
431 | u32 val; | |
432 | u16 int80; | |
99b9cdf7 TG |
433 | } __attribute__((packed)) code = { |
434 | 0xb858, /* popl %eax ; movl $...,%eax */ | |
435 | __NR_ia32_sigreturn, | |
436 | 0x80cd, /* int $0x80 */ | |
99b9cdf7 TG |
437 | }; |
438 | ||
3c1c7f10 | 439 | frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate); |
1da177e4 LT |
440 | |
441 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
3d0aedd9 | 442 | return -EFAULT; |
1da177e4 | 443 | |
2ba48e16 | 444 | if (__put_user(sig, &frame->sig)) |
3d0aedd9 | 445 | return -EFAULT; |
1da177e4 | 446 | |
2ba48e16 | 447 | if (ia32_setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0])) |
3d0aedd9 | 448 | return -EFAULT; |
1da177e4 LT |
449 | |
450 | if (_COMPAT_NSIG_WORDS > 1) { | |
2ba48e16 HS |
451 | if (__copy_to_user(frame->extramask, &set->sig[1], |
452 | sizeof(frame->extramask))) | |
3d0aedd9 | 453 | return -EFAULT; |
1da177e4 | 454 | } |
1da177e4 | 455 | |
af65d648 | 456 | if (ka->sa.sa_flags & SA_RESTORER) { |
99b9cdf7 | 457 | restorer = ka->sa.sa_restorer; |
af65d648 RM |
458 | } else { |
459 | /* Return stub is in 32bit vsyscall page */ | |
1a3e4ca4 | 460 | if (current->mm->context.vdso) |
af65d648 RM |
461 | restorer = VDSO32_SYMBOL(current->mm->context.vdso, |
462 | sigreturn); | |
463 | else | |
ade1af77 | 464 | restorer = &frame->retcode; |
af65d648 | 465 | } |
99b9cdf7 TG |
466 | err |= __put_user(ptr_to_compat(restorer), &frame->pretcode); |
467 | ||
468 | /* | |
469 | * These are actually not used anymore, but left because some | |
470 | * gdb versions depend on them as a marker. | |
471 | */ | |
472 | err |= __copy_to_user(frame->retcode, &code, 8); | |
1da177e4 | 473 | if (err) |
3d0aedd9 | 474 | return -EFAULT; |
1da177e4 LT |
475 | |
476 | /* Set up registers for signal handler */ | |
65ea5b03 PA |
477 | regs->sp = (unsigned long) frame; |
478 | regs->ip = (unsigned long) ka->sa.sa_handler; | |
1da177e4 | 479 | |
536e3ee4 | 480 | /* Make -mregparm=3 work */ |
65ea5b03 PA |
481 | regs->ax = sig; |
482 | regs->dx = 0; | |
483 | regs->cx = 0; | |
536e3ee4 | 484 | |
b6edbb1e JF |
485 | loadsegment(ds, __USER32_DS); |
486 | loadsegment(es, __USER32_DS); | |
1da177e4 | 487 | |
99b9cdf7 TG |
488 | regs->cs = __USER32_CS; |
489 | regs->ss = __USER32_DS; | |
1da177e4 | 490 | |
1da177e4 | 491 | #if DEBUG_SIG |
99b9cdf7 | 492 | printk(KERN_DEBUG "SIG deliver (%s:%d): sp=%p pc=%lx ra=%u\n", |
65ea5b03 | 493 | current->comm, current->pid, frame, regs->ip, frame->pretcode); |
1da177e4 LT |
494 | #endif |
495 | ||
1d001df1 | 496 | return 0; |
1da177e4 LT |
497 | } |
498 | ||
0928d6ef | 499 | int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
99b9cdf7 | 500 | compat_sigset_t *set, struct pt_regs *regs) |
1da177e4 LT |
501 | { |
502 | struct rt_sigframe __user *frame; | |
af65d648 | 503 | void __user *restorer; |
1da177e4 | 504 | int err = 0; |
ab513701 | 505 | void __user *fpstate = NULL; |
1da177e4 | 506 | |
99b9cdf7 TG |
507 | /* __copy_to_user optimizes that into a single 8 byte store */ |
508 | static const struct { | |
509 | u8 movl; | |
510 | u32 val; | |
511 | u16 int80; | |
9cc3c49e | 512 | u8 pad; |
99b9cdf7 TG |
513 | } __attribute__((packed)) code = { |
514 | 0xb8, | |
515 | __NR_ia32_rt_sigreturn, | |
516 | 0x80cd, | |
517 | 0, | |
518 | }; | |
519 | ||
3c1c7f10 | 520 | frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate); |
1da177e4 LT |
521 | |
522 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
3d0aedd9 | 523 | return -EFAULT; |
1da177e4 | 524 | |
812b121d | 525 | err |= __put_user(sig, &frame->sig); |
1da177e4 LT |
526 | err |= __put_user(ptr_to_compat(&frame->info), &frame->pinfo); |
527 | err |= __put_user(ptr_to_compat(&frame->uc), &frame->puc); | |
528 | err |= copy_siginfo_to_user32(&frame->info, info); | |
529 | if (err) | |
3d0aedd9 | 530 | return -EFAULT; |
1da177e4 LT |
531 | |
532 | /* Create the ucontext. */ | |
c37b5efe SS |
533 | if (cpu_has_xsave) |
534 | err |= __put_user(UC_FP_XSTATE, &frame->uc.uc_flags); | |
535 | else | |
536 | err |= __put_user(0, &frame->uc.uc_flags); | |
1da177e4 LT |
537 | err |= __put_user(0, &frame->uc.uc_link); |
538 | err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); | |
65ea5b03 | 539 | err |= __put_user(sas_ss_flags(regs->sp), |
1da177e4 LT |
540 | &frame->uc.uc_stack.ss_flags); |
541 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
3c1c7f10 | 542 | err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, fpstate, |
99b9cdf7 | 543 | regs, set->sig[0]); |
1da177e4 LT |
544 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
545 | if (err) | |
3d0aedd9 | 546 | return -EFAULT; |
1da177e4 | 547 | |
99b9cdf7 TG |
548 | if (ka->sa.sa_flags & SA_RESTORER) |
549 | restorer = ka->sa.sa_restorer; | |
af65d648 RM |
550 | else |
551 | restorer = VDSO32_SYMBOL(current->mm->context.vdso, | |
552 | rt_sigreturn); | |
99b9cdf7 | 553 | err |= __put_user(ptr_to_compat(restorer), &frame->pretcode); |
1da177e4 | 554 | |
99b9cdf7 TG |
555 | /* |
556 | * Not actually used anymore, but left because some gdb | |
557 | * versions need it. | |
558 | */ | |
559 | err |= __copy_to_user(frame->retcode, &code, 8); | |
1da177e4 | 560 | if (err) |
3d0aedd9 | 561 | return -EFAULT; |
1da177e4 LT |
562 | |
563 | /* Set up registers for signal handler */ | |
65ea5b03 PA |
564 | regs->sp = (unsigned long) frame; |
565 | regs->ip = (unsigned long) ka->sa.sa_handler; | |
1da177e4 | 566 | |
a7aacdf9 | 567 | /* Make -mregparm=3 work */ |
65ea5b03 PA |
568 | regs->ax = sig; |
569 | regs->dx = (unsigned long) &frame->info; | |
570 | regs->cx = (unsigned long) &frame->uc; | |
a7aacdf9 | 571 | |
8e3de538 | 572 | /* Make -mregparm=3 work */ |
65ea5b03 PA |
573 | regs->ax = sig; |
574 | regs->dx = (unsigned long) &frame->info; | |
575 | regs->cx = (unsigned long) &frame->uc; | |
8e3de538 | 576 | |
b6edbb1e JF |
577 | loadsegment(ds, __USER32_DS); |
578 | loadsegment(es, __USER32_DS); | |
99b9cdf7 TG |
579 | |
580 | regs->cs = __USER32_CS; | |
581 | regs->ss = __USER32_DS; | |
1da177e4 | 582 | |
1da177e4 | 583 | #if DEBUG_SIG |
99b9cdf7 | 584 | printk(KERN_DEBUG "SIG deliver (%s:%d): sp=%p pc=%lx ra=%u\n", |
65ea5b03 | 585 | current->comm, current->pid, frame, regs->ip, frame->pretcode); |
1da177e4 LT |
586 | #endif |
587 | ||
1d001df1 | 588 | return 0; |
1da177e4 | 589 | } |