Merge branch 'tracing/kmemtrace' into tracing/kmemtrace2
[linux-2.6] / arch / sparc / kernel / signal_64.c
1 /*
2  *  arch/sparc64/kernel/signal.c
3  *
4  *  Copyright (C) 1991, 1992  Linus Torvalds
5  *  Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
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
94         /* Skip %g7 as that's the thread register in userspace.  */
95
96         err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
97         err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
98         err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
99         err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
100         err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
101         err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
102         err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
103         err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
104
105         err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
106         err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
107         err |= __put_user(fp,
108               (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
109         err |= __put_user(i7,
110               (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
111
112         err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
113         if (fenab) {
114                 unsigned long *fpregs = current_thread_info()->fpregs;
115                 unsigned long fprs;
116                 
117                 fprs_write(0);
118                 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
119                 if (fprs & FPRS_DL)
120                         err |= copy_from_user(fpregs,
121                                               &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
122                                               (sizeof(unsigned int) * 32));
123                 if (fprs & FPRS_DU)
124                         err |= copy_from_user(fpregs+16,
125                          ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
126                          (sizeof(unsigned int) * 32));
127                 err |= __get_user(current_thread_info()->xfsr[0],
128                                   &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
129                 err |= __get_user(current_thread_info()->gsr[0],
130                                   &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
131                 regs->tstate &= ~TSTATE_PEF;
132         }
133         if (err)
134                 goto do_sigsegv;
135
136         return;
137 do_sigsegv:
138         force_sig(SIGSEGV, current);
139 }
140
141 asmlinkage void sparc64_get_context(struct pt_regs *regs)
142 {
143         struct ucontext __user *ucp = (struct ucontext __user *)
144                 regs->u_regs[UREG_I0];
145         mc_gregset_t __user *grp;
146         mcontext_t __user *mcp;
147         unsigned long fp, i7;
148         unsigned char fenab;
149         int err;
150
151         synchronize_user_stack();
152         if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
153                 goto do_sigsegv;
154
155 #if 1
156         fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
157 #else
158         fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
159 #endif
160                 
161         mcp = &ucp->uc_mcontext;
162         grp = &mcp->mc_gregs;
163
164         /* Skip over the trap instruction, first. */
165         if (test_thread_flag(TIF_32BIT)) {
166                 regs->tpc   = (regs->tnpc & 0xffffffff);
167                 regs->tnpc  = (regs->tnpc + 4) & 0xffffffff;
168         } else {
169                 regs->tpc   = regs->tnpc;
170                 regs->tnpc += 4;
171         }
172         err = 0;
173         if (_NSIG_WORDS == 1)
174                 err |= __put_user(current->blocked.sig[0],
175                                   (unsigned long __user *)&ucp->uc_sigmask);
176         else
177                 err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
178                                       sizeof(sigset_t));
179
180         err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
181         err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
182         err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
183         err |= __put_user(regs->y, &((*grp)[MC_Y]));
184         err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
185         err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
186         err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
187         err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
188         err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
189         err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
190         err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
191         err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
192         err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
193         err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
194         err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
195         err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
196         err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
197         err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
198         err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
199
200         err |= __get_user(fp,
201                  (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
202         err |= __get_user(i7,
203                  (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
204         err |= __put_user(fp, &(mcp->mc_fp));
205         err |= __put_user(i7, &(mcp->mc_i7));
206
207         err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
208         if (fenab) {
209                 unsigned long *fpregs = current_thread_info()->fpregs;
210                 unsigned long fprs;
211                 
212                 fprs = current_thread_info()->fpsaved[0];
213                 if (fprs & FPRS_DL)
214                         err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
215                                             (sizeof(unsigned int) * 32));
216                 if (fprs & FPRS_DU)
217                         err |= copy_to_user(
218                           ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
219                           (sizeof(unsigned int) * 32));
220                 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
221                 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
222                 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
223         }
224         if (err)
225                 goto do_sigsegv;
226
227         return;
228 do_sigsegv:
229         force_sig(SIGSEGV, current);
230 }
231
232 struct rt_signal_frame {
233         struct sparc_stackf     ss;
234         siginfo_t               info;
235         struct pt_regs          regs;
236         __siginfo_fpu_t __user  *fpu_save;
237         stack_t                 stack;
238         sigset_t                mask;
239         __siginfo_fpu_t         fpu_state;
240 };
241
242 static long _sigpause_common(old_sigset_t set)
243 {
244         set &= _BLOCKABLE;
245         spin_lock_irq(&current->sighand->siglock);
246         current->saved_sigmask = current->blocked;
247         siginitset(&current->blocked, set);
248         recalc_sigpending();
249         spin_unlock_irq(&current->sighand->siglock);
250
251         current->state = TASK_INTERRUPTIBLE;
252         schedule();
253
254         set_restore_sigmask();
255
256         return -ERESTARTNOHAND;
257 }
258
259 asmlinkage long sys_sigpause(unsigned int set)
260 {
261         return _sigpause_common(set);
262 }
263
264 asmlinkage long sys_sigsuspend(old_sigset_t set)
265 {
266         return _sigpause_common(set);
267 }
268
269 static inline int
270 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
271 {
272         unsigned long *fpregs = current_thread_info()->fpregs;
273         unsigned long fprs;
274         int err;
275
276         err = __get_user(fprs, &fpu->si_fprs);
277         fprs_write(0);
278         regs->tstate &= ~TSTATE_PEF;
279         if (fprs & FPRS_DL)
280                 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
281                                (sizeof(unsigned int) * 32));
282         if (fprs & FPRS_DU)
283                 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
284                                (sizeof(unsigned int) * 32));
285         err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
286         err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
287         current_thread_info()->fpsaved[0] |= fprs;
288         return err;
289 }
290
291 void do_rt_sigreturn(struct pt_regs *regs)
292 {
293         struct rt_signal_frame __user *sf;
294         unsigned long tpc, tnpc, tstate;
295         __siginfo_fpu_t __user *fpu_save;
296         sigset_t set;
297         int err;
298
299         /* Always make any pending restarted system calls return -EINTR */
300         current_thread_info()->restart_block.fn = do_no_restart_syscall;
301
302         synchronize_user_stack ();
303         sf = (struct rt_signal_frame __user *)
304                 (regs->u_regs [UREG_FP] + STACK_BIAS);
305
306         /* 1. Make sure we are not getting garbage from the user */
307         if (((unsigned long) sf) & 3)
308                 goto segv;
309
310         err = get_user(tpc, &sf->regs.tpc);
311         err |= __get_user(tnpc, &sf->regs.tnpc);
312         if (test_thread_flag(TIF_32BIT)) {
313                 tpc &= 0xffffffff;
314                 tnpc &= 0xffffffff;
315         }
316         err |= ((tpc | tnpc) & 3);
317
318         /* 2. Restore the state */
319         err |= __get_user(regs->y, &sf->regs.y);
320         err |= __get_user(tstate, &sf->regs.tstate);
321         err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
322
323         /* User can only change condition codes and %asi in %tstate. */
324         regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
325         regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
326
327         err |= __get_user(fpu_save, &sf->fpu_save);
328         if (fpu_save)
329                 err |= restore_fpu_state(regs, &sf->fpu_state);
330
331         err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
332         err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
333
334         if (err)
335                 goto segv;
336
337         regs->tpc = tpc;
338         regs->tnpc = tnpc;
339
340         /* Prevent syscall restart.  */
341         pt_regs_clear_syscall(regs);
342
343         sigdelsetmask(&set, ~_BLOCKABLE);
344         spin_lock_irq(&current->sighand->siglock);
345         current->blocked = set;
346         recalc_sigpending();
347         spin_unlock_irq(&current->sighand->siglock);
348         return;
349 segv:
350         force_sig(SIGSEGV, current);
351 }
352
353 /* Checks if the fp is valid */
354 static int invalid_frame_pointer(void __user *fp, int fplen)
355 {
356         if (((unsigned long) fp) & 7)
357                 return 1;
358         return 0;
359 }
360
361 static inline int
362 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
363 {
364         unsigned long *fpregs = current_thread_info()->fpregs;
365         unsigned long fprs;
366         int err = 0;
367         
368         fprs = current_thread_info()->fpsaved[0];
369         if (fprs & FPRS_DL)
370                 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
371                                     (sizeof(unsigned int) * 32));
372         if (fprs & FPRS_DU)
373                 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
374                                     (sizeof(unsigned int) * 32));
375         err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
376         err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
377         err |= __put_user(fprs, &fpu->si_fprs);
378
379         return err;
380 }
381
382 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
383 {
384         unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
385
386         /*
387          * If we are on the alternate signal stack and would overflow it, don't.
388          * Return an always-bogus address instead so we will die with SIGSEGV.
389          */
390         if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
391                 return (void __user *) -1L;
392
393         /* This is the X/Open sanctioned signal stack switching.  */
394         if (ka->sa.sa_flags & SA_ONSTACK) {
395                 if (sas_ss_flags(sp) == 0)
396                         sp = current->sas_ss_sp + current->sas_ss_size;
397         }
398
399         /* Always align the stack frame.  This handles two cases.  First,
400          * sigaltstack need not be mindful of platform specific stack
401          * alignment.  Second, if we took this signal because the stack
402          * is not aligned properly, we'd like to take the signal cleanly
403          * and report that.
404          */
405         sp &= ~7UL;
406
407         return (void __user *)(sp - framesize);
408 }
409
410 static inline void
411 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
412                int signo, sigset_t *oldset, siginfo_t *info)
413 {
414         struct rt_signal_frame __user *sf;
415         int sigframe_size, err;
416
417         /* 1. Make sure everything is clean */
418         synchronize_user_stack();
419         save_and_clear_fpu();
420         
421         sigframe_size = sizeof(struct rt_signal_frame);
422         if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
423                 sigframe_size -= sizeof(__siginfo_fpu_t);
424
425         sf = (struct rt_signal_frame __user *)
426                 get_sigframe(ka, regs, sigframe_size);
427         
428         if (invalid_frame_pointer (sf, sigframe_size))
429                 goto sigill;
430
431         if (get_thread_wsaved() != 0)
432                 goto sigill;
433
434         /* 2. Save the current process state */
435         err = copy_to_user(&sf->regs, regs, sizeof (*regs));
436
437         if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
438                 err |= save_fpu_state(regs, &sf->fpu_state);
439                 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
440         } else {
441                 err |= __put_user(0, &sf->fpu_save);
442         }
443         
444         /* Setup sigaltstack */
445         err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
446         err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
447         err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
448
449         err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
450
451         err |= copy_in_user((u64 __user *)sf,
452                             (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
453                             sizeof(struct reg_window));
454
455         if (info)
456                 err |= copy_siginfo_to_user(&sf->info, info);
457         else {
458                 err |= __put_user(signo, &sf->info.si_signo);
459                 err |= __put_user(SI_NOINFO, &sf->info.si_code);
460         }
461         if (err)
462                 goto sigsegv;
463         
464         /* 3. signal handler back-trampoline and parameters */
465         regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
466         regs->u_regs[UREG_I0] = signo;
467         regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
468
469         /* The sigcontext is passed in this way because of how it
470          * is defined in GLIBC's /usr/include/bits/sigcontext.h
471          * for sparc64.  It includes the 128 bytes of siginfo_t.
472          */
473         regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
474
475         /* 5. signal handler */
476         regs->tpc = (unsigned long) ka->sa.sa_handler;
477         regs->tnpc = (regs->tpc + 4);
478         if (test_thread_flag(TIF_32BIT)) {
479                 regs->tpc &= 0xffffffff;
480                 regs->tnpc &= 0xffffffff;
481         }
482         /* 4. return to kernel instructions */
483         regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
484         return;
485
486 sigill:
487         do_exit(SIGILL);
488 sigsegv:
489         force_sigsegv(signo, current);
490 }
491
492 static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
493                                  siginfo_t *info,
494                                  sigset_t *oldset, struct pt_regs *regs)
495 {
496         setup_rt_frame(ka, regs, signr, oldset,
497                        (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
498         spin_lock_irq(&current->sighand->siglock);
499         sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
500         if (!(ka->sa.sa_flags & SA_NOMASK))
501                 sigaddset(&current->blocked,signr);
502         recalc_sigpending();
503         spin_unlock_irq(&current->sighand->siglock);
504 }
505
506 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
507                                    struct sigaction *sa)
508 {
509         switch (regs->u_regs[UREG_I0]) {
510         case ERESTART_RESTARTBLOCK:
511         case ERESTARTNOHAND:
512         no_system_call_restart:
513                 regs->u_regs[UREG_I0] = EINTR;
514                 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
515                 break;
516         case ERESTARTSYS:
517                 if (!(sa->sa_flags & SA_RESTART))
518                         goto no_system_call_restart;
519                 /* fallthrough */
520         case ERESTARTNOINTR:
521                 regs->u_regs[UREG_I0] = orig_i0;
522                 regs->tpc -= 4;
523                 regs->tnpc -= 4;
524         }
525 }
526
527 /* Note that 'init' is a special process: it doesn't get signals it doesn't
528  * want to handle. Thus you cannot kill init even with a SIGKILL even by
529  * mistake.
530  */
531 static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
532 {
533         struct k_sigaction ka;
534         int restart_syscall;
535         sigset_t *oldset;
536         siginfo_t info;
537         int signr;
538         
539         if (pt_regs_is_syscall(regs) &&
540             (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
541                 restart_syscall = 1;
542         } else
543                 restart_syscall = 0;
544
545         if (current_thread_info()->status & TS_RESTORE_SIGMASK)
546                 oldset = &current->saved_sigmask;
547         else
548                 oldset = &current->blocked;
549
550 #ifdef CONFIG_COMPAT
551         if (test_thread_flag(TIF_32BIT)) {
552                 extern void do_signal32(sigset_t *, struct pt_regs *,
553                                         int restart_syscall,
554                                         unsigned long orig_i0);
555                 do_signal32(oldset, regs, restart_syscall, orig_i0);
556                 return;
557         }
558 #endif  
559
560         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
561
562         /* If the debugger messes with the program counter, it clears
563          * the software "in syscall" bit, directing us to not perform
564          * a syscall restart.
565          */
566         if (restart_syscall && !pt_regs_is_syscall(regs))
567                 restart_syscall = 0;
568
569         if (signr > 0) {
570                 if (restart_syscall)
571                         syscall_restart(orig_i0, regs, &ka.sa);
572                 handle_signal(signr, &ka, &info, oldset, regs);
573
574                 /* A signal was successfully delivered; the saved
575                  * sigmask will have been stored in the signal frame,
576                  * and will be restored by sigreturn, so we can simply
577                  * clear the TS_RESTORE_SIGMASK flag.
578                  */
579                 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
580
581                 tracehook_signal_handler(signr, &info, &ka, regs, 0);
582                 return;
583         }
584         if (restart_syscall &&
585             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
586              regs->u_regs[UREG_I0] == ERESTARTSYS ||
587              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
588                 /* replay the system call when we are done */
589                 regs->u_regs[UREG_I0] = orig_i0;
590                 regs->tpc -= 4;
591                 regs->tnpc -= 4;
592         }
593         if (restart_syscall &&
594             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
595                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
596                 regs->tpc -= 4;
597                 regs->tnpc -= 4;
598         }
599
600         /* If there's no signal to deliver, we just put the saved sigmask
601          * back
602          */
603         if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
604                 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
605                 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
606         }
607 }
608
609 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
610 {
611         if (thread_info_flags & _TIF_SIGPENDING)
612                 do_signal(regs, orig_i0);
613         if (thread_info_flags & _TIF_NOTIFY_RESUME) {
614                 clear_thread_flag(TIF_NOTIFY_RESUME);
615                 tracehook_notify_resume(regs);
616         }
617 }