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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> | |
78f7f1e5 | 24 | #include <asm/fpu/internal.h> |
fcbc99c4 | 25 | #include <asm/fpu/signal.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 | |
ce395960 | 37 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) |
1da177e4 | 38 | { |
3b4b7570 | 39 | int err = 0; |
0b91f45b | 40 | bool ia32 = test_thread_flag(TIF_IA32); |
99b9cdf7 TG |
41 | |
42 | if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t))) | |
1da177e4 LT |
43 | return -EFAULT; |
44 | ||
3b4b7570 HS |
45 | put_user_try { |
46 | /* If you change siginfo_t structure, please make sure that | |
47 | this code is fixed accordingly. | |
48 | It should never copy any pad contained in the structure | |
49 | to avoid security leaks, but must copy the generic | |
50 | 3 ints plus the relevant union member. */ | |
51 | put_user_ex(from->si_signo, &to->si_signo); | |
52 | put_user_ex(from->si_errno, &to->si_errno); | |
53 | put_user_ex((short)from->si_code, &to->si_code); | |
54 | ||
55 | if (from->si_code < 0) { | |
56 | put_user_ex(from->si_pid, &to->si_pid); | |
57 | put_user_ex(from->si_uid, &to->si_uid); | |
58 | put_user_ex(ptr_to_compat(from->si_ptr), &to->si_ptr); | |
59 | } else { | |
60 | /* | |
61 | * First 32bits of unions are always present: | |
62 | * si_pid === si_band === si_tid === si_addr(LS half) | |
63 | */ | |
64 | put_user_ex(from->_sifields._pad[0], | |
65 | &to->_sifields._pad[0]); | |
66 | switch (from->si_code >> 16) { | |
67 | case __SI_FAULT >> 16: | |
68 | break; | |
a0727e8c WD |
69 | case __SI_SYS >> 16: |
70 | put_user_ex(from->si_syscall, &to->si_syscall); | |
71 | put_user_ex(from->si_arch, &to->si_arch); | |
72 | break; | |
3b4b7570 | 73 | case __SI_CHLD >> 16: |
e7084fd5 PA |
74 | if (ia32) { |
75 | put_user_ex(from->si_utime, &to->si_utime); | |
76 | put_user_ex(from->si_stime, &to->si_stime); | |
77 | } else { | |
78 | put_user_ex(from->si_utime, &to->_sifields._sigchld_x32._utime); | |
79 | put_user_ex(from->si_stime, &to->_sifields._sigchld_x32._stime); | |
80 | } | |
3b4b7570 HS |
81 | put_user_ex(from->si_status, &to->si_status); |
82 | /* FALL THROUGH */ | |
83 | default: | |
84 | case __SI_KILL >> 16: | |
85 | put_user_ex(from->si_uid, &to->si_uid); | |
86 | break; | |
87 | case __SI_POLL >> 16: | |
88 | put_user_ex(from->si_fd, &to->si_fd); | |
89 | break; | |
90 | case __SI_TIMER >> 16: | |
91 | put_user_ex(from->si_overrun, &to->si_overrun); | |
92 | put_user_ex(ptr_to_compat(from->si_ptr), | |
93 | &to->si_ptr); | |
94 | break; | |
95 | /* This is not generated by the kernel as of now. */ | |
96 | case __SI_RT >> 16: | |
97 | case __SI_MESGQ >> 16: | |
98 | put_user_ex(from->si_uid, &to->si_uid); | |
99 | put_user_ex(from->si_int, &to->si_int); | |
100 | break; | |
101 | } | |
1da177e4 | 102 | } |
3b4b7570 HS |
103 | } put_user_catch(err); |
104 | ||
1da177e4 LT |
105 | return err; |
106 | } | |
107 | ||
108 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) | |
109 | { | |
3b4b7570 | 110 | int err = 0; |
1da177e4 | 111 | u32 ptr32; |
99b9cdf7 TG |
112 | |
113 | if (!access_ok(VERIFY_READ, from, sizeof(compat_siginfo_t))) | |
1da177e4 LT |
114 | return -EFAULT; |
115 | ||
3b4b7570 HS |
116 | get_user_try { |
117 | get_user_ex(to->si_signo, &from->si_signo); | |
118 | get_user_ex(to->si_errno, &from->si_errno); | |
119 | get_user_ex(to->si_code, &from->si_code); | |
1da177e4 | 120 | |
3b4b7570 HS |
121 | get_user_ex(to->si_pid, &from->si_pid); |
122 | get_user_ex(to->si_uid, &from->si_uid); | |
123 | get_user_ex(ptr32, &from->si_ptr); | |
124 | to->si_ptr = compat_ptr(ptr32); | |
125 | } get_user_catch(err); | |
1da177e4 LT |
126 | |
127 | return err; | |
128 | } | |
129 | ||
1da177e4 LT |
130 | /* |
131 | * Do a signal return; undo the signal stack. | |
132 | */ | |
a967bb3f HS |
133 | #define loadsegment_gs(v) load_gs_index(v) |
134 | #define loadsegment_fs(v) loadsegment(fs, v) | |
135 | #define loadsegment_ds(v) loadsegment(ds, v) | |
136 | #define loadsegment_es(v) loadsegment(es, v) | |
137 | ||
138 | #define get_user_seg(seg) ({ unsigned int v; savesegment(seg, v); v; }) | |
139 | #define set_user_seg(seg, v) loadsegment_##seg(v) | |
140 | ||
b78a5b52 | 141 | #define COPY(x) { \ |
3b4b7570 | 142 | get_user_ex(regs->x, &sc->x); \ |
1da177e4 | 143 | } |
1da177e4 | 144 | |
8801ead4 HS |
145 | #define GET_SEG(seg) ({ \ |
146 | unsigned short tmp; \ | |
147 | get_user_ex(tmp, &sc->seg); \ | |
148 | tmp; \ | |
149 | }) | |
150 | ||
151 | #define COPY_SEG_CPL3(seg) do { \ | |
152 | regs->seg = GET_SEG(seg) | 3; \ | |
153 | } while (0) | |
1da177e4 | 154 | |
8c6e5ce0 | 155 | #define RELOAD_SEG(seg) { \ |
a967bb3f HS |
156 | unsigned int pre = GET_SEG(seg); \ |
157 | unsigned int cur = get_user_seg(seg); \ | |
8c6e5ce0 HS |
158 | pre |= 3; \ |
159 | if (pre != cur) \ | |
a967bb3f | 160 | set_user_seg(seg, pre); \ |
8c6e5ce0 | 161 | } |
99b9cdf7 TG |
162 | |
163 | static int ia32_restore_sigcontext(struct pt_regs *regs, | |
6a3713f0 | 164 | struct sigcontext_ia32 __user *sc) |
99b9cdf7 | 165 | { |
a967bb3f | 166 | unsigned int tmpflags, err = 0; |
ab513701 | 167 | void __user *buf; |
99b9cdf7 TG |
168 | u32 tmp; |
169 | ||
170 | /* Always make any pending restarted system calls return -EINTR */ | |
f56141e3 | 171 | current->restart_block.fn = do_no_restart_syscall; |
99b9cdf7 | 172 | |
3b4b7570 HS |
173 | get_user_try { |
174 | /* | |
175 | * Reload fs and gs if they have changed in the signal | |
176 | * handler. This does not handle long fs/gs base changes in | |
177 | * the handler, but does not clobber them at least in the | |
178 | * normal case. | |
179 | */ | |
a967bb3f | 180 | RELOAD_SEG(gs); |
3b4b7570 HS |
181 | RELOAD_SEG(fs); |
182 | RELOAD_SEG(ds); | |
183 | RELOAD_SEG(es); | |
184 | ||
185 | COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx); | |
6a3713f0 | 186 | COPY(dx); COPY(cx); COPY(ip); COPY(ax); |
3b4b7570 HS |
187 | /* Don't touch extended registers */ |
188 | ||
189 | COPY_SEG_CPL3(cs); | |
190 | COPY_SEG_CPL3(ss); | |
191 | ||
192 | get_user_ex(tmpflags, &sc->flags); | |
193 | regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS); | |
194 | /* disable syscall checks */ | |
195 | regs->orig_ax = -1; | |
196 | ||
197 | get_user_ex(tmp, &sc->fpstate); | |
198 | buf = compat_ptr(tmp); | |
3b4b7570 HS |
199 | } get_user_catch(err); |
200 | ||
9dfe99b7 | 201 | err |= fpu__restore_sig(buf, 1); |
5e88353d | 202 | |
1daeaa31 BG |
203 | force_iret(); |
204 | ||
1da177e4 | 205 | return err; |
1da177e4 LT |
206 | } |
207 | ||
3fe26fa3 | 208 | asmlinkage long sys32_sigreturn(void) |
1da177e4 | 209 | { |
3fe26fa3 | 210 | struct pt_regs *regs = current_pt_regs(); |
3b0d29ee | 211 | struct sigframe_ia32 __user *frame = (struct sigframe_ia32 __user *)(regs->sp-8); |
1da177e4 | 212 | sigset_t set; |
1da177e4 LT |
213 | |
214 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
215 | goto badframe; | |
216 | if (__get_user(set.sig[0], &frame->sc.oldmask) | |
217 | || (_COMPAT_NSIG_WORDS > 1 | |
99b9cdf7 TG |
218 | && __copy_from_user((((char *) &set.sig) + 4), |
219 | &frame->extramask, | |
1da177e4 LT |
220 | sizeof(frame->extramask)))) |
221 | goto badframe; | |
222 | ||
905f29e2 | 223 | set_current_blocked(&set); |
99b9cdf7 | 224 | |
6a3713f0 | 225 | if (ia32_restore_sigcontext(regs, &frame->sc)) |
1da177e4 | 226 | goto badframe; |
6a3713f0 | 227 | return regs->ax; |
1da177e4 LT |
228 | |
229 | badframe: | |
230 | signal_fault(regs, frame, "32bit sigreturn"); | |
231 | return 0; | |
99b9cdf7 | 232 | } |
1da177e4 | 233 | |
3fe26fa3 | 234 | asmlinkage long sys32_rt_sigreturn(void) |
1da177e4 | 235 | { |
3fe26fa3 | 236 | struct pt_regs *regs = current_pt_regs(); |
3b0d29ee | 237 | struct rt_sigframe_ia32 __user *frame; |
1da177e4 | 238 | sigset_t set; |
1da177e4 | 239 | |
3b0d29ee | 240 | frame = (struct rt_sigframe_ia32 __user *)(regs->sp - 4); |
1da177e4 LT |
241 | |
242 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
243 | goto badframe; | |
244 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
245 | goto badframe; | |
246 | ||
905f29e2 | 247 | set_current_blocked(&set); |
99b9cdf7 | 248 | |
6a3713f0 | 249 | if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext)) |
1da177e4 LT |
250 | goto badframe; |
251 | ||
90268439 | 252 | if (compat_restore_altstack(&frame->uc.uc_stack)) |
1da177e4 LT |
253 | goto badframe; |
254 | ||
6a3713f0 | 255 | return regs->ax; |
1da177e4 LT |
256 | |
257 | badframe: | |
99b9cdf7 | 258 | signal_fault(regs, frame, "32bit rt sigreturn"); |
1da177e4 | 259 | return 0; |
99b9cdf7 | 260 | } |
1da177e4 LT |
261 | |
262 | /* | |
263 | * Set up a signal frame. | |
264 | */ | |
265 | ||
99b9cdf7 | 266 | static int ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc, |
ab513701 | 267 | void __user *fpstate, |
99b9cdf7 | 268 | struct pt_regs *regs, unsigned int mask) |
1da177e4 | 269 | { |
a967bb3f | 270 | int err = 0; |
1da177e4 | 271 | |
3b4b7570 | 272 | put_user_try { |
a967bb3f HS |
273 | put_user_ex(get_user_seg(gs), (unsigned int __user *)&sc->gs); |
274 | put_user_ex(get_user_seg(fs), (unsigned int __user *)&sc->fs); | |
275 | put_user_ex(get_user_seg(ds), (unsigned int __user *)&sc->ds); | |
276 | put_user_ex(get_user_seg(es), (unsigned int __user *)&sc->es); | |
3b4b7570 HS |
277 | |
278 | put_user_ex(regs->di, &sc->di); | |
279 | put_user_ex(regs->si, &sc->si); | |
280 | put_user_ex(regs->bp, &sc->bp); | |
281 | put_user_ex(regs->sp, &sc->sp); | |
282 | put_user_ex(regs->bx, &sc->bx); | |
283 | put_user_ex(regs->dx, &sc->dx); | |
284 | put_user_ex(regs->cx, &sc->cx); | |
285 | put_user_ex(regs->ax, &sc->ax); | |
51e7dc70 | 286 | put_user_ex(current->thread.trap_nr, &sc->trapno); |
3b4b7570 HS |
287 | put_user_ex(current->thread.error_code, &sc->err); |
288 | put_user_ex(regs->ip, &sc->ip); | |
289 | put_user_ex(regs->cs, (unsigned int __user *)&sc->cs); | |
290 | put_user_ex(regs->flags, &sc->flags); | |
291 | put_user_ex(regs->sp, &sc->sp_at_signal); | |
292 | put_user_ex(regs->ss, (unsigned int __user *)&sc->ss); | |
293 | ||
294 | put_user_ex(ptr_to_compat(fpstate), &sc->fpstate); | |
295 | ||
296 | /* non-iBCS2 extensions.. */ | |
297 | put_user_ex(mask, &sc->oldmask); | |
298 | put_user_ex(current->thread.cr2, &sc->cr2); | |
299 | } put_user_catch(err); | |
1da177e4 LT |
300 | |
301 | return err; | |
302 | } | |
303 | ||
304 | /* | |
305 | * Determine which stack to use.. | |
306 | */ | |
235b8022 | 307 | static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, |
3c1c7f10 | 308 | size_t frame_size, |
0ff8fef4 | 309 | void __user **fpstate) |
1da177e4 | 310 | { |
c5bedc68 | 311 | struct fpu *fpu = ¤t->thread.fpu; |
65ea5b03 | 312 | unsigned long sp; |
1da177e4 LT |
313 | |
314 | /* Default to using normal stack */ | |
65ea5b03 | 315 | sp = regs->sp; |
1da177e4 LT |
316 | |
317 | /* This is the X/Open sanctioned signal stack switching. */ | |
235b8022 AV |
318 | if (ksig->ka.sa.sa_flags & SA_ONSTACK) |
319 | sp = sigsp(sp, ksig); | |
1da177e4 | 320 | /* This is the legacy signal stack switching. */ |
8bee3f0a | 321 | else if ((regs->ss & 0xffff) != __USER32_DS && |
235b8022 AV |
322 | !(ksig->ka.sa.sa_flags & SA_RESTORER) && |
323 | ksig->ka.sa.sa_restorer) | |
324 | sp = (unsigned long) ksig->ka.sa.sa_restorer; | |
1da177e4 | 325 | |
c5bedc68 | 326 | if (fpu->fpstate_active) { |
72a671ce SS |
327 | unsigned long fx_aligned, math_size; |
328 | ||
82c0e45e | 329 | sp = fpu__alloc_mathframe(sp, 1, &fx_aligned, &math_size); |
0ff8fef4 | 330 | *fpstate = (struct _fpstate_ia32 __user *) sp; |
c8e14041 | 331 | if (copy_fpstate_to_sigframe(*fpstate, (void __user *)fx_aligned, |
72a671ce | 332 | math_size) < 0) |
99ea1b93 | 333 | return (void __user *) -1L; |
3c1c7f10 SS |
334 | } |
335 | ||
65ea5b03 | 336 | sp -= frame_size; |
d347f372 MO |
337 | /* Align the stack pointer according to the i386 ABI, |
338 | * i.e. so that on function entry ((sp + 4) & 15) == 0. */ | |
65ea5b03 PA |
339 | sp = ((sp + 4) & -16ul) - 4; |
340 | return (void __user *) sp; | |
1da177e4 LT |
341 | } |
342 | ||
235b8022 | 343 | int ia32_setup_frame(int sig, struct ksignal *ksig, |
99b9cdf7 | 344 | compat_sigset_t *set, struct pt_regs *regs) |
1da177e4 | 345 | { |
3b0d29ee | 346 | struct sigframe_ia32 __user *frame; |
99b9cdf7 | 347 | void __user *restorer; |
1da177e4 | 348 | int err = 0; |
ab513701 | 349 | void __user *fpstate = NULL; |
1da177e4 | 350 | |
99b9cdf7 TG |
351 | /* copy_to_user optimizes that into a single 8 byte store */ |
352 | static const struct { | |
353 | u16 poplmovl; | |
354 | u32 val; | |
355 | u16 int80; | |
99b9cdf7 TG |
356 | } __attribute__((packed)) code = { |
357 | 0xb858, /* popl %eax ; movl $...,%eax */ | |
358 | __NR_ia32_sigreturn, | |
359 | 0x80cd, /* int $0x80 */ | |
99b9cdf7 TG |
360 | }; |
361 | ||
235b8022 | 362 | frame = get_sigframe(ksig, regs, sizeof(*frame), &fpstate); |
1da177e4 LT |
363 | |
364 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
3d0aedd9 | 365 | return -EFAULT; |
1da177e4 | 366 | |
2ba48e16 | 367 | if (__put_user(sig, &frame->sig)) |
3d0aedd9 | 368 | return -EFAULT; |
1da177e4 | 369 | |
2ba48e16 | 370 | if (ia32_setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0])) |
3d0aedd9 | 371 | return -EFAULT; |
1da177e4 LT |
372 | |
373 | if (_COMPAT_NSIG_WORDS > 1) { | |
2ba48e16 HS |
374 | if (__copy_to_user(frame->extramask, &set->sig[1], |
375 | sizeof(frame->extramask))) | |
3d0aedd9 | 376 | return -EFAULT; |
1da177e4 | 377 | } |
1da177e4 | 378 | |
235b8022 AV |
379 | if (ksig->ka.sa.sa_flags & SA_RESTORER) { |
380 | restorer = ksig->ka.sa.sa_restorer; | |
af65d648 RM |
381 | } else { |
382 | /* Return stub is in 32bit vsyscall page */ | |
1a3e4ca4 | 383 | if (current->mm->context.vdso) |
6f121e54 AL |
384 | restorer = current->mm->context.vdso + |
385 | selected_vdso32->sym___kernel_sigreturn; | |
af65d648 | 386 | else |
ade1af77 | 387 | restorer = &frame->retcode; |
af65d648 | 388 | } |
99b9cdf7 | 389 | |
3b4b7570 HS |
390 | put_user_try { |
391 | put_user_ex(ptr_to_compat(restorer), &frame->pretcode); | |
392 | ||
393 | /* | |
394 | * These are actually not used anymore, but left because some | |
395 | * gdb versions depend on them as a marker. | |
396 | */ | |
0ff8fef4 | 397 | put_user_ex(*((u64 *)&code), (u64 __user *)frame->retcode); |
3b4b7570 HS |
398 | } put_user_catch(err); |
399 | ||
1da177e4 | 400 | if (err) |
3d0aedd9 | 401 | return -EFAULT; |
1da177e4 LT |
402 | |
403 | /* Set up registers for signal handler */ | |
65ea5b03 | 404 | regs->sp = (unsigned long) frame; |
235b8022 | 405 | regs->ip = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 | 406 | |
536e3ee4 | 407 | /* Make -mregparm=3 work */ |
65ea5b03 PA |
408 | regs->ax = sig; |
409 | regs->dx = 0; | |
410 | regs->cx = 0; | |
536e3ee4 | 411 | |
b6edbb1e JF |
412 | loadsegment(ds, __USER32_DS); |
413 | loadsegment(es, __USER32_DS); | |
1da177e4 | 414 | |
99b9cdf7 TG |
415 | regs->cs = __USER32_CS; |
416 | regs->ss = __USER32_DS; | |
1da177e4 | 417 | |
1d001df1 | 418 | return 0; |
1da177e4 LT |
419 | } |
420 | ||
235b8022 | 421 | int ia32_setup_rt_frame(int sig, struct ksignal *ksig, |
99b9cdf7 | 422 | compat_sigset_t *set, struct pt_regs *regs) |
1da177e4 | 423 | { |
3b0d29ee | 424 | struct rt_sigframe_ia32 __user *frame; |
af65d648 | 425 | void __user *restorer; |
1da177e4 | 426 | int err = 0; |
ab513701 | 427 | void __user *fpstate = NULL; |
1da177e4 | 428 | |
99b9cdf7 TG |
429 | /* __copy_to_user optimizes that into a single 8 byte store */ |
430 | static const struct { | |
431 | u8 movl; | |
432 | u32 val; | |
433 | u16 int80; | |
9cc3c49e | 434 | u8 pad; |
99b9cdf7 TG |
435 | } __attribute__((packed)) code = { |
436 | 0xb8, | |
437 | __NR_ia32_rt_sigreturn, | |
438 | 0x80cd, | |
439 | 0, | |
440 | }; | |
441 | ||
235b8022 | 442 | frame = get_sigframe(ksig, regs, sizeof(*frame), &fpstate); |
1da177e4 LT |
443 | |
444 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
3d0aedd9 | 445 | return -EFAULT; |
1da177e4 | 446 | |
3b4b7570 HS |
447 | put_user_try { |
448 | put_user_ex(sig, &frame->sig); | |
449 | put_user_ex(ptr_to_compat(&frame->info), &frame->pinfo); | |
450 | put_user_ex(ptr_to_compat(&frame->uc), &frame->puc); | |
1da177e4 | 451 | |
3b4b7570 HS |
452 | /* Create the ucontext. */ |
453 | if (cpu_has_xsave) | |
454 | put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags); | |
455 | else | |
456 | put_user_ex(0, &frame->uc.uc_flags); | |
457 | put_user_ex(0, &frame->uc.uc_link); | |
bd1c149a | 458 | compat_save_altstack_ex(&frame->uc.uc_stack, regs->sp); |
3b4b7570 | 459 | |
235b8022 AV |
460 | if (ksig->ka.sa.sa_flags & SA_RESTORER) |
461 | restorer = ksig->ka.sa.sa_restorer; | |
3b4b7570 | 462 | else |
6f121e54 AL |
463 | restorer = current->mm->context.vdso + |
464 | selected_vdso32->sym___kernel_rt_sigreturn; | |
3b4b7570 HS |
465 | put_user_ex(ptr_to_compat(restorer), &frame->pretcode); |
466 | ||
467 | /* | |
468 | * Not actually used anymore, but left because some gdb | |
469 | * versions need it. | |
470 | */ | |
0ff8fef4 | 471 | put_user_ex(*((u64 *)&code), (u64 __user *)frame->retcode); |
3b4b7570 | 472 | } put_user_catch(err); |
1da177e4 | 473 | |
235b8022 | 474 | err |= copy_siginfo_to_user32(&frame->info, &ksig->info); |
5e88353d PA |
475 | err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, fpstate, |
476 | regs, set->sig[0]); | |
477 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
478 | ||
1da177e4 | 479 | if (err) |
3d0aedd9 | 480 | return -EFAULT; |
1da177e4 LT |
481 | |
482 | /* Set up registers for signal handler */ | |
65ea5b03 | 483 | regs->sp = (unsigned long) frame; |
235b8022 | 484 | regs->ip = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 | 485 | |
a7aacdf9 | 486 | /* Make -mregparm=3 work */ |
65ea5b03 PA |
487 | regs->ax = sig; |
488 | regs->dx = (unsigned long) &frame->info; | |
489 | regs->cx = (unsigned long) &frame->uc; | |
a7aacdf9 | 490 | |
b6edbb1e JF |
491 | loadsegment(ds, __USER32_DS); |
492 | loadsegment(es, __USER32_DS); | |
99b9cdf7 TG |
493 | |
494 | regs->cs = __USER32_CS; | |
495 | regs->ss = __USER32_DS; | |
1da177e4 | 496 | |
1d001df1 | 497 | return 0; |
1da177e4 | 498 | } |