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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 | 14 | #include <linux/kernel.h> |
1da177e4 LT |
15 | #include <linux/errno.h> |
16 | #include <linux/wait.h> | |
1da177e4 LT |
17 | #include <linux/unistd.h> |
18 | #include <linux/stddef.h> | |
19 | #include <linux/personality.h> | |
20 | #include <linux/compat.h> | |
9fbbd4dd | 21 | #include <linux/binfmts.h> |
1da177e4 LT |
22 | #include <asm/ucontext.h> |
23 | #include <asm/uaccess.h> | |
24 | #include <asm/i387.h> | |
1361b83a | 25 | #include <asm/fpu-internal.h> |
1da177e4 LT |
26 | #include <asm/ptrace.h> |
27 | #include <asm/ia32_unistd.h> | |
28 | #include <asm/user32.h> | |
29 | #include <asm/sigcontext32.h> | |
1da177e4 | 30 | #include <asm/proto.h> |
af65d648 | 31 | #include <asm/vdso.h> |
d98f9d84 | 32 | #include <asm/sigframe.h> |
f28f0c23 | 33 | #include <asm/sighandling.h> |
2f06de06 | 34 | #include <asm/sys_ia32.h> |
49b8c695 | 35 | #include <asm/smap.h> |
d98f9d84 | 36 | |
f28f0c23 | 37 | #define FIX_EFLAGS __FIX_EFLAGS |
1da177e4 LT |
38 | |
39 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) | |
40 | { | |
3b4b7570 | 41 | int err = 0; |
0b91f45b | 42 | bool ia32 = test_thread_flag(TIF_IA32); |
99b9cdf7 TG |
43 | |
44 | if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t))) | |
1da177e4 LT |
45 | return -EFAULT; |
46 | ||
3b4b7570 HS |
47 | put_user_try { |
48 | /* If you change siginfo_t structure, please make sure that | |
49 | this code is fixed accordingly. | |
50 | It should never copy any pad contained in the structure | |
51 | to avoid security leaks, but must copy the generic | |
52 | 3 ints plus the relevant union member. */ | |
53 | put_user_ex(from->si_signo, &to->si_signo); | |
54 | put_user_ex(from->si_errno, &to->si_errno); | |
55 | put_user_ex((short)from->si_code, &to->si_code); | |
56 | ||
57 | if (from->si_code < 0) { | |
58 | put_user_ex(from->si_pid, &to->si_pid); | |
59 | put_user_ex(from->si_uid, &to->si_uid); | |
60 | put_user_ex(ptr_to_compat(from->si_ptr), &to->si_ptr); | |
61 | } else { | |
62 | /* | |
63 | * First 32bits of unions are always present: | |
64 | * si_pid === si_band === si_tid === si_addr(LS half) | |
65 | */ | |
66 | put_user_ex(from->_sifields._pad[0], | |
67 | &to->_sifields._pad[0]); | |
68 | switch (from->si_code >> 16) { | |
69 | case __SI_FAULT >> 16: | |
70 | break; | |
a0727e8c WD |
71 | case __SI_SYS >> 16: |
72 | put_user_ex(from->si_syscall, &to->si_syscall); | |
73 | put_user_ex(from->si_arch, &to->si_arch); | |
74 | break; | |
3b4b7570 | 75 | case __SI_CHLD >> 16: |
e7084fd5 PA |
76 | if (ia32) { |
77 | put_user_ex(from->si_utime, &to->si_utime); | |
78 | put_user_ex(from->si_stime, &to->si_stime); | |
79 | } else { | |
80 | put_user_ex(from->si_utime, &to->_sifields._sigchld_x32._utime); | |
81 | put_user_ex(from->si_stime, &to->_sifields._sigchld_x32._stime); | |
82 | } | |
3b4b7570 HS |
83 | put_user_ex(from->si_status, &to->si_status); |
84 | /* FALL THROUGH */ | |
85 | default: | |
86 | case __SI_KILL >> 16: | |
87 | put_user_ex(from->si_uid, &to->si_uid); | |
88 | break; | |
89 | case __SI_POLL >> 16: | |
90 | put_user_ex(from->si_fd, &to->si_fd); | |
91 | break; | |
92 | case __SI_TIMER >> 16: | |
93 | put_user_ex(from->si_overrun, &to->si_overrun); | |
94 | put_user_ex(ptr_to_compat(from->si_ptr), | |
95 | &to->si_ptr); | |
96 | break; | |
97 | /* This is not generated by the kernel as of now. */ | |
98 | case __SI_RT >> 16: | |
99 | case __SI_MESGQ >> 16: | |
100 | put_user_ex(from->si_uid, &to->si_uid); | |
101 | put_user_ex(from->si_int, &to->si_int); | |
102 | break; | |
103 | } | |
1da177e4 | 104 | } |
3b4b7570 HS |
105 | } put_user_catch(err); |
106 | ||
1da177e4 LT |
107 | return err; |
108 | } | |
109 | ||
110 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) | |
111 | { | |
3b4b7570 | 112 | int err = 0; |
1da177e4 | 113 | u32 ptr32; |
99b9cdf7 TG |
114 | |
115 | if (!access_ok(VERIFY_READ, from, sizeof(compat_siginfo_t))) | |
1da177e4 LT |
116 | return -EFAULT; |
117 | ||
3b4b7570 HS |
118 | get_user_try { |
119 | get_user_ex(to->si_signo, &from->si_signo); | |
120 | get_user_ex(to->si_errno, &from->si_errno); | |
121 | get_user_ex(to->si_code, &from->si_code); | |
1da177e4 | 122 | |
3b4b7570 HS |
123 | get_user_ex(to->si_pid, &from->si_pid); |
124 | get_user_ex(to->si_uid, &from->si_uid); | |
125 | get_user_ex(ptr32, &from->si_ptr); | |
126 | to->si_ptr = compat_ptr(ptr32); | |
127 | } get_user_catch(err); | |
1da177e4 LT |
128 | |
129 | return err; | |
130 | } | |
131 | ||
1da177e4 LT |
132 | /* |
133 | * Do a signal return; undo the signal stack. | |
134 | */ | |
a967bb3f HS |
135 | #define loadsegment_gs(v) load_gs_index(v) |
136 | #define loadsegment_fs(v) loadsegment(fs, v) | |
137 | #define loadsegment_ds(v) loadsegment(ds, v) | |
138 | #define loadsegment_es(v) loadsegment(es, v) | |
139 | ||
140 | #define get_user_seg(seg) ({ unsigned int v; savesegment(seg, v); v; }) | |
141 | #define set_user_seg(seg, v) loadsegment_##seg(v) | |
142 | ||
b78a5b52 | 143 | #define COPY(x) { \ |
3b4b7570 | 144 | get_user_ex(regs->x, &sc->x); \ |
1da177e4 | 145 | } |
1da177e4 | 146 | |
8801ead4 HS |
147 | #define GET_SEG(seg) ({ \ |
148 | unsigned short tmp; \ | |
149 | get_user_ex(tmp, &sc->seg); \ | |
150 | tmp; \ | |
151 | }) | |
152 | ||
153 | #define COPY_SEG_CPL3(seg) do { \ | |
154 | regs->seg = GET_SEG(seg) | 3; \ | |
155 | } while (0) | |
1da177e4 | 156 | |
8c6e5ce0 | 157 | #define RELOAD_SEG(seg) { \ |
a967bb3f HS |
158 | unsigned int pre = GET_SEG(seg); \ |
159 | unsigned int cur = get_user_seg(seg); \ | |
8c6e5ce0 HS |
160 | pre |= 3; \ |
161 | if (pre != cur) \ | |
a967bb3f | 162 | set_user_seg(seg, pre); \ |
8c6e5ce0 | 163 | } |
99b9cdf7 TG |
164 | |
165 | static int ia32_restore_sigcontext(struct pt_regs *regs, | |
166 | struct sigcontext_ia32 __user *sc, | |
047ce935 | 167 | unsigned int *pax) |
99b9cdf7 | 168 | { |
a967bb3f | 169 | unsigned int tmpflags, err = 0; |
ab513701 | 170 | void __user *buf; |
99b9cdf7 TG |
171 | u32 tmp; |
172 | ||
173 | /* Always make any pending restarted system calls return -EINTR */ | |
174 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
175 | ||
3b4b7570 HS |
176 | get_user_try { |
177 | /* | |
178 | * Reload fs and gs if they have changed in the signal | |
179 | * handler. This does not handle long fs/gs base changes in | |
180 | * the handler, but does not clobber them at least in the | |
181 | * normal case. | |
182 | */ | |
a967bb3f | 183 | RELOAD_SEG(gs); |
3b4b7570 HS |
184 | RELOAD_SEG(fs); |
185 | RELOAD_SEG(ds); | |
186 | RELOAD_SEG(es); | |
187 | ||
188 | COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx); | |
189 | COPY(dx); COPY(cx); COPY(ip); | |
190 | /* Don't touch extended registers */ | |
191 | ||
192 | COPY_SEG_CPL3(cs); | |
193 | COPY_SEG_CPL3(ss); | |
194 | ||
195 | get_user_ex(tmpflags, &sc->flags); | |
196 | regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS); | |
197 | /* disable syscall checks */ | |
198 | regs->orig_ax = -1; | |
199 | ||
200 | get_user_ex(tmp, &sc->fpstate); | |
201 | buf = compat_ptr(tmp); | |
3b4b7570 HS |
202 | |
203 | get_user_ex(*pax, &sc->ax); | |
204 | } get_user_catch(err); | |
205 | ||
49b8c695 | 206 | err |= restore_xstate_sig(buf, 1); |
5e88353d | 207 | |
1da177e4 | 208 | return err; |
1da177e4 LT |
209 | } |
210 | ||
3fe26fa3 | 211 | asmlinkage long sys32_sigreturn(void) |
1da177e4 | 212 | { |
3fe26fa3 | 213 | struct pt_regs *regs = current_pt_regs(); |
3b0d29ee | 214 | struct sigframe_ia32 __user *frame = (struct sigframe_ia32 __user *)(regs->sp-8); |
1da177e4 | 215 | sigset_t set; |
65ea5b03 | 216 | unsigned int ax; |
1da177e4 LT |
217 | |
218 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
219 | goto badframe; | |
220 | if (__get_user(set.sig[0], &frame->sc.oldmask) | |
221 | || (_COMPAT_NSIG_WORDS > 1 | |
99b9cdf7 TG |
222 | && __copy_from_user((((char *) &set.sig) + 4), |
223 | &frame->extramask, | |
1da177e4 LT |
224 | sizeof(frame->extramask)))) |
225 | goto badframe; | |
226 | ||
905f29e2 | 227 | set_current_blocked(&set); |
99b9cdf7 | 228 | |
65ea5b03 | 229 | if (ia32_restore_sigcontext(regs, &frame->sc, &ax)) |
1da177e4 | 230 | goto badframe; |
65ea5b03 | 231 | return ax; |
1da177e4 LT |
232 | |
233 | badframe: | |
234 | signal_fault(regs, frame, "32bit sigreturn"); | |
235 | return 0; | |
99b9cdf7 | 236 | } |
1da177e4 | 237 | |
3fe26fa3 | 238 | asmlinkage long sys32_rt_sigreturn(void) |
1da177e4 | 239 | { |
3fe26fa3 | 240 | struct pt_regs *regs = current_pt_regs(); |
3b0d29ee | 241 | struct rt_sigframe_ia32 __user *frame; |
1da177e4 | 242 | sigset_t set; |
65ea5b03 | 243 | unsigned int ax; |
1da177e4 | 244 | |
3b0d29ee | 245 | frame = (struct rt_sigframe_ia32 __user *)(regs->sp - 4); |
1da177e4 LT |
246 | |
247 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
248 | goto badframe; | |
249 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
250 | goto badframe; | |
251 | ||
905f29e2 | 252 | set_current_blocked(&set); |
99b9cdf7 | 253 | |
65ea5b03 | 254 | if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax)) |
1da177e4 LT |
255 | goto badframe; |
256 | ||
90268439 | 257 | if (compat_restore_altstack(&frame->uc.uc_stack)) |
1da177e4 LT |
258 | goto badframe; |
259 | ||
65ea5b03 | 260 | return ax; |
1da177e4 LT |
261 | |
262 | badframe: | |
99b9cdf7 | 263 | signal_fault(regs, frame, "32bit rt sigreturn"); |
1da177e4 | 264 | return 0; |
99b9cdf7 | 265 | } |
1da177e4 LT |
266 | |
267 | /* | |
268 | * Set up a signal frame. | |
269 | */ | |
270 | ||
99b9cdf7 | 271 | static int ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc, |
ab513701 | 272 | void __user *fpstate, |
99b9cdf7 | 273 | struct pt_regs *regs, unsigned int mask) |
1da177e4 | 274 | { |
a967bb3f | 275 | int err = 0; |
1da177e4 | 276 | |
3b4b7570 | 277 | put_user_try { |
a967bb3f HS |
278 | put_user_ex(get_user_seg(gs), (unsigned int __user *)&sc->gs); |
279 | put_user_ex(get_user_seg(fs), (unsigned int __user *)&sc->fs); | |
280 | put_user_ex(get_user_seg(ds), (unsigned int __user *)&sc->ds); | |
281 | put_user_ex(get_user_seg(es), (unsigned int __user *)&sc->es); | |
3b4b7570 HS |
282 | |
283 | put_user_ex(regs->di, &sc->di); | |
284 | put_user_ex(regs->si, &sc->si); | |
285 | put_user_ex(regs->bp, &sc->bp); | |
286 | put_user_ex(regs->sp, &sc->sp); | |
287 | put_user_ex(regs->bx, &sc->bx); | |
288 | put_user_ex(regs->dx, &sc->dx); | |
289 | put_user_ex(regs->cx, &sc->cx); | |
290 | put_user_ex(regs->ax, &sc->ax); | |
51e7dc70 | 291 | put_user_ex(current->thread.trap_nr, &sc->trapno); |
3b4b7570 HS |
292 | put_user_ex(current->thread.error_code, &sc->err); |
293 | put_user_ex(regs->ip, &sc->ip); | |
294 | put_user_ex(regs->cs, (unsigned int __user *)&sc->cs); | |
295 | put_user_ex(regs->flags, &sc->flags); | |
296 | put_user_ex(regs->sp, &sc->sp_at_signal); | |
297 | put_user_ex(regs->ss, (unsigned int __user *)&sc->ss); | |
298 | ||
299 | put_user_ex(ptr_to_compat(fpstate), &sc->fpstate); | |
300 | ||
301 | /* non-iBCS2 extensions.. */ | |
302 | put_user_ex(mask, &sc->oldmask); | |
303 | put_user_ex(current->thread.cr2, &sc->cr2); | |
304 | } put_user_catch(err); | |
1da177e4 LT |
305 | |
306 | return err; | |
307 | } | |
308 | ||
309 | /* | |
310 | * Determine which stack to use.. | |
311 | */ | |
99b9cdf7 | 312 | static void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, |
3c1c7f10 | 313 | size_t frame_size, |
0ff8fef4 | 314 | void __user **fpstate) |
1da177e4 | 315 | { |
65ea5b03 | 316 | unsigned long sp; |
1da177e4 LT |
317 | |
318 | /* Default to using normal stack */ | |
65ea5b03 | 319 | sp = regs->sp; |
1da177e4 LT |
320 | |
321 | /* This is the X/Open sanctioned signal stack switching. */ | |
322 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
65ea5b03 PA |
323 | if (sas_ss_flags(sp) == 0) |
324 | sp = current->sas_ss_sp + current->sas_ss_size; | |
1da177e4 LT |
325 | } |
326 | ||
327 | /* This is the legacy signal stack switching. */ | |
8bee3f0a | 328 | else if ((regs->ss & 0xffff) != __USER32_DS && |
1da177e4 | 329 | !(ka->sa.sa_flags & SA_RESTORER) && |
99b9cdf7 | 330 | ka->sa.sa_restorer) |
65ea5b03 | 331 | sp = (unsigned long) ka->sa.sa_restorer; |
1da177e4 | 332 | |
3c1c7f10 | 333 | if (used_math()) { |
72a671ce SS |
334 | unsigned long fx_aligned, math_size; |
335 | ||
336 | sp = alloc_mathframe(sp, 1, &fx_aligned, &math_size); | |
0ff8fef4 | 337 | *fpstate = (struct _fpstate_ia32 __user *) sp; |
72a671ce SS |
338 | if (save_xstate_sig(*fpstate, (void __user *)fx_aligned, |
339 | math_size) < 0) | |
99ea1b93 | 340 | return (void __user *) -1L; |
3c1c7f10 SS |
341 | } |
342 | ||
65ea5b03 | 343 | sp -= frame_size; |
d347f372 MO |
344 | /* Align the stack pointer according to the i386 ABI, |
345 | * i.e. so that on function entry ((sp + 4) & 15) == 0. */ | |
65ea5b03 PA |
346 | sp = ((sp + 4) & -16ul) - 4; |
347 | return (void __user *) sp; | |
1da177e4 LT |
348 | } |
349 | ||
0928d6ef | 350 | int ia32_setup_frame(int sig, struct k_sigaction *ka, |
99b9cdf7 | 351 | compat_sigset_t *set, struct pt_regs *regs) |
1da177e4 | 352 | { |
3b0d29ee | 353 | struct sigframe_ia32 __user *frame; |
99b9cdf7 | 354 | void __user *restorer; |
1da177e4 | 355 | int err = 0; |
ab513701 | 356 | void __user *fpstate = NULL; |
1da177e4 | 357 | |
99b9cdf7 TG |
358 | /* copy_to_user optimizes that into a single 8 byte store */ |
359 | static const struct { | |
360 | u16 poplmovl; | |
361 | u32 val; | |
362 | u16 int80; | |
99b9cdf7 TG |
363 | } __attribute__((packed)) code = { |
364 | 0xb858, /* popl %eax ; movl $...,%eax */ | |
365 | __NR_ia32_sigreturn, | |
366 | 0x80cd, /* int $0x80 */ | |
99b9cdf7 TG |
367 | }; |
368 | ||
3c1c7f10 | 369 | frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate); |
1da177e4 LT |
370 | |
371 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
3d0aedd9 | 372 | return -EFAULT; |
1da177e4 | 373 | |
2ba48e16 | 374 | if (__put_user(sig, &frame->sig)) |
3d0aedd9 | 375 | return -EFAULT; |
1da177e4 | 376 | |
2ba48e16 | 377 | if (ia32_setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0])) |
3d0aedd9 | 378 | return -EFAULT; |
1da177e4 LT |
379 | |
380 | if (_COMPAT_NSIG_WORDS > 1) { | |
2ba48e16 HS |
381 | if (__copy_to_user(frame->extramask, &set->sig[1], |
382 | sizeof(frame->extramask))) | |
3d0aedd9 | 383 | return -EFAULT; |
1da177e4 | 384 | } |
1da177e4 | 385 | |
af65d648 | 386 | if (ka->sa.sa_flags & SA_RESTORER) { |
99b9cdf7 | 387 | restorer = ka->sa.sa_restorer; |
af65d648 RM |
388 | } else { |
389 | /* Return stub is in 32bit vsyscall page */ | |
1a3e4ca4 | 390 | if (current->mm->context.vdso) |
af65d648 RM |
391 | restorer = VDSO32_SYMBOL(current->mm->context.vdso, |
392 | sigreturn); | |
393 | else | |
ade1af77 | 394 | restorer = &frame->retcode; |
af65d648 | 395 | } |
99b9cdf7 | 396 | |
3b4b7570 HS |
397 | put_user_try { |
398 | put_user_ex(ptr_to_compat(restorer), &frame->pretcode); | |
399 | ||
400 | /* | |
401 | * These are actually not used anymore, but left because some | |
402 | * gdb versions depend on them as a marker. | |
403 | */ | |
0ff8fef4 | 404 | put_user_ex(*((u64 *)&code), (u64 __user *)frame->retcode); |
3b4b7570 HS |
405 | } put_user_catch(err); |
406 | ||
1da177e4 | 407 | if (err) |
3d0aedd9 | 408 | return -EFAULT; |
1da177e4 LT |
409 | |
410 | /* Set up registers for signal handler */ | |
65ea5b03 PA |
411 | regs->sp = (unsigned long) frame; |
412 | regs->ip = (unsigned long) ka->sa.sa_handler; | |
1da177e4 | 413 | |
536e3ee4 | 414 | /* Make -mregparm=3 work */ |
65ea5b03 PA |
415 | regs->ax = sig; |
416 | regs->dx = 0; | |
417 | regs->cx = 0; | |
536e3ee4 | 418 | |
b6edbb1e JF |
419 | loadsegment(ds, __USER32_DS); |
420 | loadsegment(es, __USER32_DS); | |
1da177e4 | 421 | |
99b9cdf7 TG |
422 | regs->cs = __USER32_CS; |
423 | regs->ss = __USER32_DS; | |
1da177e4 | 424 | |
1d001df1 | 425 | return 0; |
1da177e4 LT |
426 | } |
427 | ||
0928d6ef | 428 | int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
99b9cdf7 | 429 | compat_sigset_t *set, struct pt_regs *regs) |
1da177e4 | 430 | { |
3b0d29ee | 431 | struct rt_sigframe_ia32 __user *frame; |
af65d648 | 432 | void __user *restorer; |
1da177e4 | 433 | int err = 0; |
ab513701 | 434 | void __user *fpstate = NULL; |
1da177e4 | 435 | |
99b9cdf7 TG |
436 | /* __copy_to_user optimizes that into a single 8 byte store */ |
437 | static const struct { | |
438 | u8 movl; | |
439 | u32 val; | |
440 | u16 int80; | |
9cc3c49e | 441 | u8 pad; |
99b9cdf7 TG |
442 | } __attribute__((packed)) code = { |
443 | 0xb8, | |
444 | __NR_ia32_rt_sigreturn, | |
445 | 0x80cd, | |
446 | 0, | |
447 | }; | |
448 | ||
3c1c7f10 | 449 | frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate); |
1da177e4 LT |
450 | |
451 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
3d0aedd9 | 452 | return -EFAULT; |
1da177e4 | 453 | |
3b4b7570 HS |
454 | put_user_try { |
455 | put_user_ex(sig, &frame->sig); | |
456 | put_user_ex(ptr_to_compat(&frame->info), &frame->pinfo); | |
457 | put_user_ex(ptr_to_compat(&frame->uc), &frame->puc); | |
1da177e4 | 458 | |
3b4b7570 HS |
459 | /* Create the ucontext. */ |
460 | if (cpu_has_xsave) | |
461 | put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags); | |
462 | else | |
463 | put_user_ex(0, &frame->uc.uc_flags); | |
464 | put_user_ex(0, &frame->uc.uc_link); | |
c40702c4 | 465 | err |= __compat_save_altstack(&frame->uc.uc_stack, regs->sp); |
3b4b7570 HS |
466 | |
467 | if (ka->sa.sa_flags & SA_RESTORER) | |
468 | restorer = ka->sa.sa_restorer; | |
469 | else | |
470 | restorer = VDSO32_SYMBOL(current->mm->context.vdso, | |
471 | rt_sigreturn); | |
472 | put_user_ex(ptr_to_compat(restorer), &frame->pretcode); | |
473 | ||
474 | /* | |
475 | * Not actually used anymore, but left because some gdb | |
476 | * versions need it. | |
477 | */ | |
0ff8fef4 | 478 | put_user_ex(*((u64 *)&code), (u64 __user *)frame->retcode); |
3b4b7570 | 479 | } put_user_catch(err); |
1da177e4 | 480 | |
5e88353d PA |
481 | err |= copy_siginfo_to_user32(&frame->info, info); |
482 | err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, fpstate, | |
483 | regs, set->sig[0]); | |
484 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
485 | ||
1da177e4 | 486 | if (err) |
3d0aedd9 | 487 | return -EFAULT; |
1da177e4 LT |
488 | |
489 | /* Set up registers for signal handler */ | |
65ea5b03 PA |
490 | regs->sp = (unsigned long) frame; |
491 | regs->ip = (unsigned long) ka->sa.sa_handler; | |
1da177e4 | 492 | |
a7aacdf9 | 493 | /* Make -mregparm=3 work */ |
65ea5b03 PA |
494 | regs->ax = sig; |
495 | regs->dx = (unsigned long) &frame->info; | |
496 | regs->cx = (unsigned long) &frame->uc; | |
a7aacdf9 | 497 | |
b6edbb1e JF |
498 | loadsegment(ds, __USER32_DS); |
499 | loadsegment(es, __USER32_DS); | |
99b9cdf7 TG |
500 | |
501 | regs->cs = __USER32_CS; | |
502 | regs->ss = __USER32_DS; | |
1da177e4 | 503 | |
1d001df1 | 504 | return 0; |
1da177e4 | 505 | } |