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sparc64: tracehook: TIF_NOTIFY_RESUME
[net-next-2.6.git] / arch / sparc64 / kernel / signal.c
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b00dc837 1/*
1da177e4
LT		 2 * arch/sparc64/kernel/signal.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
7 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
8 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
9 */
10
09337f50 11#ifdef CONFIG_COMPAT
1da177e4
LT		 12#include <linux/compat.h> /* for compat_old_sigset_t */
13#endif
14#include <linux/sched.h>
15#include <linux/kernel.h>
16#include <linux/signal.h>
17#include <linux/errno.h>
18#include <linux/wait.h>
19#include <linux/ptrace.h>
e35a8925 20#include <linux/tracehook.h>
1da177e4
LT		 21#include <linux/unistd.h>
22#include <linux/mm.h>
23#include <linux/tty.h>
1da177e4
LT		 24#include <linux/binfmts.h>
25#include <linux/bitops.h>
26
27#include <asm/uaccess.h>
28#include <asm/ptrace.h>
1da177e4
LT		 29#include <asm/pgtable.h>
30#include <asm/fpumacro.h>
31#include <asm/uctx.h>
32#include <asm/siginfo.h>
33#include <asm/visasm.h>
34
062ea6d3
DM		 35#include "entry.h"
36#include "systbls.h"
37
1da177e4
LT		 38#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
39
1da177e4
LT		 40/* {set, get}context() needed for 64-bit SparcLinux userland. */
41asmlinkage void sparc64_set_context(struct pt_regs *regs)
42{
43 struct ucontext __user *ucp = (struct ucontext __user *)
44 regs->u_regs[UREG_I0];
45 mc_gregset_t __user *grp;
46 unsigned long pc, npc, tstate;
47 unsigned long fp, i7;
48 unsigned char fenab;
49 int err;
50
51 flush_user_windows();
52 if (get_thread_wsaved() ||
53 (((unsigned long)ucp) & (sizeof(unsigned long)-1)) ||
54 (!__access_ok(ucp, sizeof(*ucp))))
55 goto do_sigsegv;
56 grp = &ucp->uc_mcontext.mc_gregs;
57 err = __get_user(pc, &((*grp)[MC_PC]));
58 err |= __get_user(npc, &((*grp)[MC_NPC]));
59 if (err || ((pc | npc) & 3))
60 goto do_sigsegv;
61 if (regs->u_regs[UREG_I1]) {
62 sigset_t set;
63
64 if (_NSIG_WORDS == 1) {
65 if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
66 goto do_sigsegv;
67 } else {
68 if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
69 goto do_sigsegv;
70 }
71 sigdelsetmask(&set, ~_BLOCKABLE);
72 spin_lock_irq(&current->sighand->siglock);
73 current->blocked = set;
74 recalc_sigpending();
75 spin_unlock_irq(&current->sighand->siglock);
76 }
77 if (test_thread_flag(TIF_32BIT)) {
78 pc &= 0xffffffff;
79 npc &= 0xffffffff;
80 }
81 regs->tpc = pc;
82 regs->tnpc = npc;
83 err |= __get_user(regs->y, &((*grp)[MC_Y]));
84 err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
85 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
86 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
87 err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
88 err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
89 err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
90 err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
91 err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
92 err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
93 err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7]));
94 err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
95 err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
96 err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
97 err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
98 err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
99 err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
100 err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
101 err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
102
103 err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
104 err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
105 err |= __put_user(fp,
106 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
107 err |= __put_user(i7,
108 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
109
110 err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
111 if (fenab) {
112 unsigned long *fpregs = current_thread_info()->fpregs;
113 unsigned long fprs;
114
115 fprs_write(0);
116 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
117 if (fprs & FPRS_DL)
118 err |= copy_from_user(fpregs,
119 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
120 (sizeof(unsigned int) * 32));
121 if (fprs & FPRS_DU)
122 err |= copy_from_user(fpregs+16,
123 ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
124 (sizeof(unsigned int) * 32));
125 err |= __get_user(current_thread_info()->xfsr[0],
126 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
127 err |= __get_user(current_thread_info()->gsr[0],
128 &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
129 regs->tstate &= ~TSTATE_PEF;
130 }
131 if (err)
132 goto do_sigsegv;
133
134 return;
135do_sigsegv:
136 force_sig(SIGSEGV, current);
137}
138
139asmlinkage void sparc64_get_context(struct pt_regs *regs)
140{
141 struct ucontext __user *ucp = (struct ucontext __user *)
142 regs->u_regs[UREG_I0];
143 mc_gregset_t __user *grp;
144 mcontext_t __user *mcp;
145 unsigned long fp, i7;
146 unsigned char fenab;
147 int err;
148
149 synchronize_user_stack();
150 if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
151 goto do_sigsegv;
152
153#if 1
154 fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
155#else
156 fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
157#endif
158
159 mcp = &ucp->uc_mcontext;
160 grp = &mcp->mc_gregs;
161
162 /* Skip over the trap instruction, first. */
163 if (test_thread_flag(TIF_32BIT)) {
164 regs->tpc = (regs->tnpc & 0xffffffff);
165 regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
166 } else {
167 regs->tpc = regs->tnpc;
168 regs->tnpc += 4;
169 }
170 err = 0;
171 if (_NSIG_WORDS == 1)
172 err |= __put_user(current->blocked.sig[0],
173 (unsigned long __user *)&ucp->uc_sigmask);
174 else
175 err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
176 sizeof(sigset_t));
177
178 err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
179 err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
180 err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
181 err |= __put_user(regs->y, &((*grp)[MC_Y]));
182 err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
183 err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
184 err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
185 err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
186 err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
187 err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
188 err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
189 err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
190 err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
191 err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
192 err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
193 err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
194 err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
195 err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
196 err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
197
198 err |= __get_user(fp,
199 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
200 err |= __get_user(i7,
201 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
202 err |= __put_user(fp, &(mcp->mc_fp));
203 err |= __put_user(i7, &(mcp->mc_i7));
204
205 err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
206 if (fenab) {
207 unsigned long *fpregs = current_thread_info()->fpregs;
208 unsigned long fprs;
209
210 fprs = current_thread_info()->fpsaved[0];
211 if (fprs & FPRS_DL)
212 err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
213 (sizeof(unsigned int) * 32));
214 if (fprs & FPRS_DU)
215 err |= copy_to_user(
216 ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
217 (sizeof(unsigned int) * 32));
218 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
219 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
220 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
221 }
222 if (err)
223 goto do_sigsegv;
224
225 return;
226do_sigsegv:
227 force_sig(SIGSEGV, current);
228}
229
230struct rt_signal_frame {
231 struct sparc_stackf ss;
232 siginfo_t info;
233 struct pt_regs regs;
234 __siginfo_fpu_t __user *fpu_save;
235 stack_t stack;
236 sigset_t mask;
237 __siginfo_fpu_t fpu_state;
238};
239
2d7d5f05 240static long _sigpause_common(old_sigset_t set)
1da177e4 241{
1da177e4
LT		 242 set &= _BLOCKABLE;
243 spin_lock_irq(&current->sighand->siglock);
2d7d5f05 244 current->saved_sigmask = current->blocked;
1da177e4
LT		 245 siginitset(&current->blocked, set);
246 recalc_sigpending();
247 spin_unlock_irq(&current->sighand->siglock);
1da177e4 248
2d7d5f05
DM		 249 current->state = TASK_INTERRUPTIBLE;
250 schedule();
9a28dbf8
DM		 251
252 set_restore_sigmask();
253
2d7d5f05 254 return -ERESTARTNOHAND;
1da177e4
LT		 255}
256
2d7d5f05 257asmlinkage long sys_sigpause(unsigned int set)
1da177e4 258{
2d7d5f05 259 return _sigpause_common(set);
1da177e4
LT		 260}
261
2d7d5f05 262asmlinkage long sys_sigsuspend(old_sigset_t set)
1da177e4 263{
2d7d5f05 264 return _sigpause_common(set);
1da177e4
LT		 265}
266
267static inline int
268restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
269{
270 unsigned long *fpregs = current_thread_info()->fpregs;
271 unsigned long fprs;
272 int err;
273
274 err = __get_user(fprs, &fpu->si_fprs);
275 fprs_write(0);
276 regs->tstate &= ~TSTATE_PEF;
277 if (fprs & FPRS_DL)
278 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
279 (sizeof(unsigned int) * 32));
280 if (fprs & FPRS_DU)
281 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
282 (sizeof(unsigned int) * 32));
283 err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
284 err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
285 current_thread_info()->fpsaved[0] |= fprs;
286 return err;
287}
288
289void do_rt_sigreturn(struct pt_regs *regs)
290{
291 struct rt_signal_frame __user *sf;
292 unsigned long tpc, tnpc, tstate;
293 __siginfo_fpu_t __user *fpu_save;
1da177e4 294 sigset_t set;
1da177e4
LT		 295 int err;
296
297 /* Always make any pending restarted system calls return -EINTR */
298 current_thread_info()->restart_block.fn = do_no_restart_syscall;
299
300 synchronize_user_stack ();
301 sf = (struct rt_signal_frame __user *)
302 (regs->u_regs [UREG_FP] + STACK_BIAS);
303
304 /* 1. Make sure we are not getting garbage from the user */
305 if (((unsigned long) sf) & 3)
306 goto segv;
307
308 err = get_user(tpc, &sf->regs.tpc);
309 err |= __get_user(tnpc, &sf->regs.tnpc);
310 if (test_thread_flag(TIF_32BIT)) {
311 tpc &= 0xffffffff;
312 tnpc &= 0xffffffff;
313 }
314 err |= ((tpc | tnpc) & 3);
315
316 /* 2. Restore the state */
317 err |= __get_user(regs->y, &sf->regs.y);
318 err |= __get_user(tstate, &sf->regs.tstate);
319 err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
320
321 /* User can only change condition codes and %asi in %tstate. */
322 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
323 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
324
325 err |= __get_user(fpu_save, &sf->fpu_save);
326 if (fpu_save)
327 err |= restore_fpu_state(regs, &sf->fpu_state);
328
329 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
62715ec8
ON		 330 err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
331
1da177e4
LT		 332 if (err)
333 goto segv;
62715ec8 334
1da177e4
LT		 335 regs->tpc = tpc;
336 regs->tnpc = tnpc;
1da177e4 337
2678fefe 338 /* Prevent syscall restart. */
28e61036 339 pt_regs_clear_syscall(regs);
2678fefe 340
1da177e4
LT		 341 sigdelsetmask(&set, ~_BLOCKABLE);
342 spin_lock_irq(&current->sighand->siglock);
343 current->blocked = set;
344 recalc_sigpending();
345 spin_unlock_irq(&current->sighand->siglock);
346 return;
347segv:
348 force_sig(SIGSEGV, current);
349}
350
351/* Checks if the fp is valid */
352static int invalid_frame_pointer(void __user *fp, int fplen)
353{
354 if (((unsigned long) fp) & 7)
355 return 1;
356 return 0;
357}
358
359static inline int
360save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
361{
7c3cce97 362 unsigned long *fpregs = current_thread_info()->fpregs;
1da177e4
LT		 363 unsigned long fprs;
364 int err = 0;
365
366 fprs = current_thread_info()->fpsaved[0];
367 if (fprs & FPRS_DL)
368 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
369 (sizeof(unsigned int) * 32));
370 if (fprs & FPRS_DU)
371 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
372 (sizeof(unsigned int) * 32));
373 err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
374 err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
375 err |= __put_user(fprs, &fpu->si_fprs);
376
377 return err;
378}
379
380static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
381{
dc5dc7e6 382 unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
1da177e4 383
dc5dc7e6
DM		 384 /*
385 * If we are on the alternate signal stack and would overflow it, don't.
386 * Return an always-bogus address instead so we will die with SIGSEGV.
387 */
388 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
389 return (void __user *) -1L;
1da177e4
LT		 390
391 /* This is the X/Open sanctioned signal stack switching. */
392 if (ka->sa.sa_flags & SA_ONSTACK) {
dc5dc7e6 393 if (sas_ss_flags(sp) == 0)
1da177e4
LT		 394 sp = current->sas_ss_sp + current->sas_ss_size;
395 }
dc5dc7e6
DM		 396
397 /* Always align the stack frame. This handles two cases. First,
398 * sigaltstack need not be mindful of platform specific stack
399 * alignment. Second, if we took this signal because the stack
400 * is not aligned properly, we'd like to take the signal cleanly
401 * and report that.
402 */
403 sp &= ~7UL;
404
1da177e4
LT		 405 return (void __user *)(sp - framesize);
406}
407
408static inline void
409setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
410 int signo, sigset_t *oldset, siginfo_t *info)
411{
412 struct rt_signal_frame __user *sf;
413 int sigframe_size, err;
414
415 /* 1. Make sure everything is clean */
416 synchronize_user_stack();
417 save_and_clear_fpu();
418
7cf06995 419 sigframe_size = sizeof(struct rt_signal_frame);
1da177e4
LT		 420 if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
421 sigframe_size -= sizeof(__siginfo_fpu_t);
422
423 sf = (struct rt_signal_frame __user *)
424 get_sigframe(ka, regs, sigframe_size);
425
426 if (invalid_frame_pointer (sf, sigframe_size))
427 goto sigill;
428
429 if (get_thread_wsaved() != 0)
430 goto sigill;
431
432 /* 2. Save the current process state */
433 err = copy_to_user(&sf->regs, regs, sizeof (*regs));
434
435 if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
436 err |= save_fpu_state(regs, &sf->fpu_state);
437 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
438 } else {
439 err |= __put_user(0, &sf->fpu_save);
440 }
441
442 /* Setup sigaltstack */
443 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
444 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
445 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
446
447 err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
448
449 err |= copy_in_user((u64 __user *)sf,
450 (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
451 sizeof(struct reg_window));
452
453 if (info)
454 err |= copy_siginfo_to_user(&sf->info, info);
455 else {
456 err |= __put_user(signo, &sf->info.si_signo);
457 err |= __put_user(SI_NOINFO, &sf->info.si_code);
458 }
459 if (err)
460 goto sigsegv;
461
462 /* 3. signal handler back-trampoline and parameters */
463 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
464 regs->u_regs[UREG_I0] = signo;
465 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
466
467 /* The sigcontext is passed in this way because of how it
468 * is defined in GLIBC's /usr/include/bits/sigcontext.h
469 * for sparc64. It includes the 128 bytes of siginfo_t.
470 */
471 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
472
473 /* 5. signal handler */
474 regs->tpc = (unsigned long) ka->sa.sa_handler;
475 regs->tnpc = (regs->tpc + 4);
476 if (test_thread_flag(TIF_32BIT)) {
477 regs->tpc &= 0xffffffff;
478 regs->tnpc &= 0xffffffff;
479 }
480 /* 4. return to kernel instructions */
481 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
482 return;
483
484sigill:
485 do_exit(SIGILL);
486sigsegv:
487 force_sigsegv(signo, current);
488}
489
490static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
491 siginfo_t *info,
492 sigset_t *oldset, struct pt_regs *regs)
493{
494 setup_rt_frame(ka, regs, signr, oldset,
495 (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
69be8f18
SR		 496 spin_lock_irq(&current->sighand->siglock);
497 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
498 if (!(ka->sa.sa_flags & SA_NOMASK))
1da177e4 499 sigaddset(&current->blocked,signr);
69be8f18
SR		 500 recalc_sigpending();
501 spin_unlock_irq(&current->sighand->siglock);
1da177e4
LT		 502}
503
504static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
28e61036 505 struct sigaction *sa)
1da177e4
LT		 506{
507 switch (regs->u_regs[UREG_I0]) {
508 case ERESTART_RESTARTBLOCK:
509 case ERESTARTNOHAND:
510 no_system_call_restart:
511 regs->u_regs[UREG_I0] = EINTR;
512 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
513 break;
514 case ERESTARTSYS:
515 if (!(sa->sa_flags & SA_RESTART))
516 goto no_system_call_restart;
517 /* fallthrough */
518 case ERESTARTNOINTR:
519 regs->u_regs[UREG_I0] = orig_i0;
520 regs->tpc -= 4;
521 regs->tnpc -= 4;
522 }
523}
524
525/* Note that 'init' is a special process: it doesn't get signals it doesn't
526 * want to handle. Thus you cannot kill init even with a SIGKILL even by
527 * mistake.
528 */
238468b2 529static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
1da177e4 530{
1da177e4 531 struct k_sigaction ka;
28e61036 532 int restart_syscall;
2d7d5f05 533 sigset_t *oldset;
238468b2 534 siginfo_t info;
90888816 535 int signr;
1da177e4 536
2678fefe
DM		 537 if (pt_regs_is_syscall(regs) &&
538 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
28e61036 539 restart_syscall = 1;
238468b2 540 } else
28e61036 541 restart_syscall = 0;
1da177e4 542
9a28dbf8 543 if (current_thread_info()->status & TS_RESTORE_SIGMASK)
2d7d5f05
DM		 544 oldset = &current->saved_sigmask;
545 else
1da177e4
LT		 546 oldset = &current->blocked;
547
09337f50 548#ifdef CONFIG_COMPAT
1da177e4 549 if (test_thread_flag(TIF_32BIT)) {
2d7d5f05 550 extern void do_signal32(sigset_t *, struct pt_regs *,
28e61036
DM		 551 int restart_syscall,
552 unsigned long orig_i0);
553 do_signal32(oldset, regs, restart_syscall, orig_i0);
2d7d5f05 554 return;
1da177e4
LT		 555 }
556#endif
557
28e61036
DM		 558 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
559
560 /* If the debugger messes with the program counter, it clears
561 * the software "in syscall" bit, directing us to not perform
562 * a syscall restart.
563 */
564 if (restart_syscall && !pt_regs_is_syscall(regs))
565 restart_syscall = 0;
566
1da177e4 567 if (signr > 0) {
28e61036
DM		 568 if (restart_syscall)
569 syscall_restart(orig_i0, regs, &ka.sa);
1da177e4 570 handle_signal(signr, &ka, &info, oldset, regs);
2d7d5f05 571
9a28dbf8 572 /* A signal was successfully delivered; the saved
2d7d5f05
DM		 573 * sigmask will have been stored in the signal frame,
574 * and will be restored by sigreturn, so we can simply
9a28dbf8 575 * clear the TS_RESTORE_SIGMASK flag.
2d7d5f05 576 */
9a28dbf8 577 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
2d7d5f05 578 return;
1da177e4 579 }
28e61036 580 if (restart_syscall &&
1da177e4
LT		 581 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
582 regs->u_regs[UREG_I0] == ERESTARTSYS ||
583 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
584 /* replay the system call when we are done */
28e61036 585 regs->u_regs[UREG_I0] = orig_i0;
1da177e4
LT		 586 regs->tpc -= 4;
587 regs->tnpc -= 4;
588 }
28e61036 589 if (restart_syscall &&
1da177e4
LT		 590 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
591 regs->u_regs[UREG_G1] = __NR_restart_syscall;
592 regs->tpc -= 4;
593 regs->tnpc -= 4;
594 }
2d7d5f05 595
9a28dbf8 596 /* If there's no signal to deliver, we just put the saved sigmask
2d7d5f05
DM		 597 * back
598 */
9a28dbf8
DM		 599 if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
600 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
2d7d5f05
DM		 601 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
602 }
1da177e4
LT		 603}
604
7697daaa 605void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
1da177e4 606{
9a28dbf8 607 if (thread_info_flags & _TIF_SIGPENDING)
238468b2 608 do_signal(regs, orig_i0);
e35a8925
RM		 609 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
610 clear_thread_flag(TIF_NOTIFY_RESUME);
611 tracehook_notify_resume(regs);
612 }
1da177e4 613}
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