sparc64: tracehook: TIF_NOTIFY_RESUME
[linux-2.6] / arch / sparc64 / kernel / signal.c
1 /*
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
11 #ifdef CONFIG_COMPAT
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>
20 #include <linux/tracehook.h>
21 #include <linux/unistd.h>
22 #include <linux/mm.h>
23 #include <linux/tty.h>
24 #include <linux/binfmts.h>
25 #include <linux/bitops.h>
26
27 #include <asm/uaccess.h>
28 #include <asm/ptrace.h>
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
35 #include "entry.h"
36 #include "systbls.h"
37
38 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
39
40 /* {set, get}context() needed for 64-bit SparcLinux userland. */
41 asmlinkage 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;
135 do_sigsegv:
136         force_sig(SIGSEGV, current);
137 }
138
139 asmlinkage 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;
226 do_sigsegv:
227         force_sig(SIGSEGV, current);
228 }
229
230 struct 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
240 static long _sigpause_common(old_sigset_t set)
241 {
242         set &= _BLOCKABLE;
243         spin_lock_irq(&current->sighand->siglock);
244         current->saved_sigmask = current->blocked;
245         siginitset(&current->blocked, set);
246         recalc_sigpending();
247         spin_unlock_irq(&current->sighand->siglock);
248
249         current->state = TASK_INTERRUPTIBLE;
250         schedule();
251
252         set_restore_sigmask();
253
254         return -ERESTARTNOHAND;
255 }
256
257 asmlinkage long sys_sigpause(unsigned int set)
258 {
259         return _sigpause_common(set);
260 }
261
262 asmlinkage long sys_sigsuspend(old_sigset_t set)
263 {
264         return _sigpause_common(set);
265 }
266
267 static inline int
268 restore_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
289 void 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;
294         sigset_t set;
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));
330         err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
331
332         if (err)
333                 goto segv;
334
335         regs->tpc = tpc;
336         regs->tnpc = tnpc;
337
338         /* Prevent syscall restart.  */
339         pt_regs_clear_syscall(regs);
340
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;
347 segv:
348         force_sig(SIGSEGV, current);
349 }
350
351 /* Checks if the fp is valid */
352 static int invalid_frame_pointer(void __user *fp, int fplen)
353 {
354         if (((unsigned long) fp) & 7)
355                 return 1;
356         return 0;
357 }
358
359 static inline int
360 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
361 {
362         unsigned long *fpregs = current_thread_info()->fpregs;
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
380 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
381 {
382         unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
383
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;
390
391         /* This is the X/Open sanctioned signal stack switching.  */
392         if (ka->sa.sa_flags & SA_ONSTACK) {
393                 if (sas_ss_flags(sp) == 0)
394                         sp = current->sas_ss_sp + current->sas_ss_size;
395         }
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
405         return (void __user *)(sp - framesize);
406 }
407
408 static inline void
409 setup_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         
419         sigframe_size = sizeof(struct rt_signal_frame);
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
484 sigill:
485         do_exit(SIGILL);
486 sigsegv:
487         force_sigsegv(signo, current);
488 }
489
490 static 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);
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))
499                 sigaddset(&current->blocked,signr);
500         recalc_sigpending();
501         spin_unlock_irq(&current->sighand->siglock);
502 }
503
504 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
505                                    struct sigaction *sa)
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  */
529 static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
530 {
531         struct k_sigaction ka;
532         int restart_syscall;
533         sigset_t *oldset;
534         siginfo_t info;
535         int signr;
536         
537         if (pt_regs_is_syscall(regs) &&
538             (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
539                 restart_syscall = 1;
540         } else
541                 restart_syscall = 0;
542
543         if (current_thread_info()->status & TS_RESTORE_SIGMASK)
544                 oldset = &current->saved_sigmask;
545         else
546                 oldset = &current->blocked;
547
548 #ifdef CONFIG_COMPAT
549         if (test_thread_flag(TIF_32BIT)) {
550                 extern void do_signal32(sigset_t *, struct pt_regs *,
551                                         int restart_syscall,
552                                         unsigned long orig_i0);
553                 do_signal32(oldset, regs, restart_syscall, orig_i0);
554                 return;
555         }
556 #endif  
557
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
567         if (signr > 0) {
568                 if (restart_syscall)
569                         syscall_restart(orig_i0, regs, &ka.sa);
570                 handle_signal(signr, &ka, &info, oldset, regs);
571
572                 /* A signal was successfully delivered; the saved
573                  * sigmask will have been stored in the signal frame,
574                  * and will be restored by sigreturn, so we can simply
575                  * clear the TS_RESTORE_SIGMASK flag.
576                  */
577                 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
578                 return;
579         }
580         if (restart_syscall &&
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 */
585                 regs->u_regs[UREG_I0] = orig_i0;
586                 regs->tpc -= 4;
587                 regs->tnpc -= 4;
588         }
589         if (restart_syscall &&
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         }
595
596         /* If there's no signal to deliver, we just put the saved sigmask
597          * back
598          */
599         if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
600                 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
601                 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
602         }
603 }
604
605 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
606 {
607         if (thread_info_flags & _TIF_SIGPENDING)
608                 do_signal(regs, orig_i0);
609         if (thread_info_flags & _TIF_NOTIFY_RESUME) {
610                 clear_thread_flag(TIF_NOTIFY_RESUME);
611                 tracehook_notify_resume(regs);
612         }
613 }