Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm
[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, 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 #include <linux/tracehook.h>
27
28 #include <asm/uaccess.h>
29 #include <asm/ptrace.h>
30 #include <asm/pgtable.h>
31 #include <asm/fpumacro.h>
32 #include <asm/uctx.h>
33 #include <asm/siginfo.h>
34 #include <asm/visasm.h>
35
36 #include "entry.h"
37 #include "systbls.h"
38
39 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
40
41 /* {set, get}context() needed for 64-bit SparcLinux userland. */
42 asmlinkage void sparc64_set_context(struct pt_regs *regs)
43 {
44         struct ucontext __user *ucp = (struct ucontext __user *)
45                 regs->u_regs[UREG_I0];
46         mc_gregset_t __user *grp;
47         unsigned long pc, npc, tstate;
48         unsigned long fp, i7;
49         unsigned char fenab;
50         int err;
51
52         flush_user_windows();
53         if (get_thread_wsaved()                                 ||
54             (((unsigned long)ucp) & (sizeof(unsigned long)-1))  ||
55             (!__access_ok(ucp, sizeof(*ucp))))
56                 goto do_sigsegv;
57         grp  = &ucp->uc_mcontext.mc_gregs;
58         err  = __get_user(pc, &((*grp)[MC_PC]));
59         err |= __get_user(npc, &((*grp)[MC_NPC]));
60         if (err || ((pc | npc) & 3))
61                 goto do_sigsegv;
62         if (regs->u_regs[UREG_I1]) {
63                 sigset_t set;
64
65                 if (_NSIG_WORDS == 1) {
66                         if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
67                                 goto do_sigsegv;
68                 } else {
69                         if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
70                                 goto do_sigsegv;
71                 }
72                 sigdelsetmask(&set, ~_BLOCKABLE);
73                 spin_lock_irq(&current->sighand->siglock);
74                 current->blocked = set;
75                 recalc_sigpending();
76                 spin_unlock_irq(&current->sighand->siglock);
77         }
78         if (test_thread_flag(TIF_32BIT)) {
79                 pc &= 0xffffffff;
80                 npc &= 0xffffffff;
81         }
82         regs->tpc = pc;
83         regs->tnpc = npc;
84         err |= __get_user(regs->y, &((*grp)[MC_Y]));
85         err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
86         regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
87         regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
88         err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
89         err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
90         err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
91         err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
92         err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
93         err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
94
95         /* Skip %g7 as that's the thread register in userspace.  */
96
97         err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
98         err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
99         err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
100         err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
101         err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
102         err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
103         err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
104         err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
105
106         err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
107         err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
108         err |= __put_user(fp,
109               (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
110         err |= __put_user(i7,
111               (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
112
113         err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
114         if (fenab) {
115                 unsigned long *fpregs = current_thread_info()->fpregs;
116                 unsigned long fprs;
117                 
118                 fprs_write(0);
119                 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
120                 if (fprs & FPRS_DL)
121                         err |= copy_from_user(fpregs,
122                                               &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
123                                               (sizeof(unsigned int) * 32));
124                 if (fprs & FPRS_DU)
125                         err |= copy_from_user(fpregs+16,
126                          ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
127                          (sizeof(unsigned int) * 32));
128                 err |= __get_user(current_thread_info()->xfsr[0],
129                                   &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
130                 err |= __get_user(current_thread_info()->gsr[0],
131                                   &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
132                 regs->tstate &= ~TSTATE_PEF;
133         }
134         if (err)
135                 goto do_sigsegv;
136
137         return;
138 do_sigsegv:
139         force_sig(SIGSEGV, current);
140 }
141
142 asmlinkage void sparc64_get_context(struct pt_regs *regs)
143 {
144         struct ucontext __user *ucp = (struct ucontext __user *)
145                 regs->u_regs[UREG_I0];
146         mc_gregset_t __user *grp;
147         mcontext_t __user *mcp;
148         unsigned long fp, i7;
149         unsigned char fenab;
150         int err;
151
152         synchronize_user_stack();
153         if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
154                 goto do_sigsegv;
155
156 #if 1
157         fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
158 #else
159         fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
160 #endif
161                 
162         mcp = &ucp->uc_mcontext;
163         grp = &mcp->mc_gregs;
164
165         /* Skip over the trap instruction, first. */
166         if (test_thread_flag(TIF_32BIT)) {
167                 regs->tpc   = (regs->tnpc & 0xffffffff);
168                 regs->tnpc  = (regs->tnpc + 4) & 0xffffffff;
169         } else {
170                 regs->tpc   = regs->tnpc;
171                 regs->tnpc += 4;
172         }
173         err = 0;
174         if (_NSIG_WORDS == 1)
175                 err |= __put_user(current->blocked.sig[0],
176                                   (unsigned long __user *)&ucp->uc_sigmask);
177         else
178                 err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
179                                       sizeof(sigset_t));
180
181         err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
182         err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
183         err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
184         err |= __put_user(regs->y, &((*grp)[MC_Y]));
185         err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
186         err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
187         err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
188         err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
189         err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
190         err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
191         err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
192         err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
193         err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
194         err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
195         err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
196         err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
197         err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
198         err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
199         err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
200
201         err |= __get_user(fp,
202                  (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
203         err |= __get_user(i7,
204                  (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
205         err |= __put_user(fp, &(mcp->mc_fp));
206         err |= __put_user(i7, &(mcp->mc_i7));
207
208         err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
209         if (fenab) {
210                 unsigned long *fpregs = current_thread_info()->fpregs;
211                 unsigned long fprs;
212                 
213                 fprs = current_thread_info()->fpsaved[0];
214                 if (fprs & FPRS_DL)
215                         err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
216                                             (sizeof(unsigned int) * 32));
217                 if (fprs & FPRS_DU)
218                         err |= copy_to_user(
219                           ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
220                           (sizeof(unsigned int) * 32));
221                 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
222                 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
223                 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
224         }
225         if (err)
226                 goto do_sigsegv;
227
228         return;
229 do_sigsegv:
230         force_sig(SIGSEGV, current);
231 }
232
233 struct rt_signal_frame {
234         struct sparc_stackf     ss;
235         siginfo_t               info;
236         struct pt_regs          regs;
237         __siginfo_fpu_t __user  *fpu_save;
238         stack_t                 stack;
239         sigset_t                mask;
240         __siginfo_fpu_t         fpu_state;
241 };
242
243 static long _sigpause_common(old_sigset_t set)
244 {
245         set &= _BLOCKABLE;
246         spin_lock_irq(&current->sighand->siglock);
247         current->saved_sigmask = current->blocked;
248         siginitset(&current->blocked, set);
249         recalc_sigpending();
250         spin_unlock_irq(&current->sighand->siglock);
251
252         current->state = TASK_INTERRUPTIBLE;
253         schedule();
254
255         set_restore_sigmask();
256
257         return -ERESTARTNOHAND;
258 }
259
260 asmlinkage long sys_sigpause(unsigned int set)
261 {
262         return _sigpause_common(set);
263 }
264
265 asmlinkage long sys_sigsuspend(old_sigset_t set)
266 {
267         return _sigpause_common(set);
268 }
269
270 static inline int
271 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
272 {
273         unsigned long *fpregs = current_thread_info()->fpregs;
274         unsigned long fprs;
275         int err;
276
277         err = __get_user(fprs, &fpu->si_fprs);
278         fprs_write(0);
279         regs->tstate &= ~TSTATE_PEF;
280         if (fprs & FPRS_DL)
281                 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
282                                (sizeof(unsigned int) * 32));
283         if (fprs & FPRS_DU)
284                 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
285                                (sizeof(unsigned int) * 32));
286         err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
287         err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
288         current_thread_info()->fpsaved[0] |= fprs;
289         return err;
290 }
291
292 void do_rt_sigreturn(struct pt_regs *regs)
293 {
294         struct rt_signal_frame __user *sf;
295         unsigned long tpc, tnpc, tstate;
296         __siginfo_fpu_t __user *fpu_save;
297         sigset_t set;
298         int err;
299
300         /* Always make any pending restarted system calls return -EINTR */
301         current_thread_info()->restart_block.fn = do_no_restart_syscall;
302
303         synchronize_user_stack ();
304         sf = (struct rt_signal_frame __user *)
305                 (regs->u_regs [UREG_FP] + STACK_BIAS);
306
307         /* 1. Make sure we are not getting garbage from the user */
308         if (((unsigned long) sf) & 3)
309                 goto segv;
310
311         err = get_user(tpc, &sf->regs.tpc);
312         err |= __get_user(tnpc, &sf->regs.tnpc);
313         if (test_thread_flag(TIF_32BIT)) {
314                 tpc &= 0xffffffff;
315                 tnpc &= 0xffffffff;
316         }
317         err |= ((tpc | tnpc) & 3);
318
319         /* 2. Restore the state */
320         err |= __get_user(regs->y, &sf->regs.y);
321         err |= __get_user(tstate, &sf->regs.tstate);
322         err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
323
324         /* User can only change condition codes and %asi in %tstate. */
325         regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
326         regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
327
328         err |= __get_user(fpu_save, &sf->fpu_save);
329         if (fpu_save)
330                 err |= restore_fpu_state(regs, &sf->fpu_state);
331
332         err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
333         err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
334
335         if (err)
336                 goto segv;
337
338         regs->tpc = tpc;
339         regs->tnpc = tnpc;
340
341         /* Prevent syscall restart.  */
342         pt_regs_clear_syscall(regs);
343
344         sigdelsetmask(&set, ~_BLOCKABLE);
345         spin_lock_irq(&current->sighand->siglock);
346         current->blocked = set;
347         recalc_sigpending();
348         spin_unlock_irq(&current->sighand->siglock);
349         return;
350 segv:
351         force_sig(SIGSEGV, current);
352 }
353
354 /* Checks if the fp is valid */
355 static int invalid_frame_pointer(void __user *fp, int fplen)
356 {
357         if (((unsigned long) fp) & 7)
358                 return 1;
359         return 0;
360 }
361
362 static inline int
363 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
364 {
365         unsigned long *fpregs = current_thread_info()->fpregs;
366         unsigned long fprs;
367         int err = 0;
368         
369         fprs = current_thread_info()->fpsaved[0];
370         if (fprs & FPRS_DL)
371                 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
372                                     (sizeof(unsigned int) * 32));
373         if (fprs & FPRS_DU)
374                 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
375                                     (sizeof(unsigned int) * 32));
376         err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
377         err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
378         err |= __put_user(fprs, &fpu->si_fprs);
379
380         return err;
381 }
382
383 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
384 {
385         unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
386
387         /*
388          * If we are on the alternate signal stack and would overflow it, don't.
389          * Return an always-bogus address instead so we will die with SIGSEGV.
390          */
391         if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
392                 return (void __user *) -1L;
393
394         /* This is the X/Open sanctioned signal stack switching.  */
395         if (ka->sa.sa_flags & SA_ONSTACK) {
396                 if (sas_ss_flags(sp) == 0)
397                         sp = current->sas_ss_sp + current->sas_ss_size;
398         }
399
400         /* Always align the stack frame.  This handles two cases.  First,
401          * sigaltstack need not be mindful of platform specific stack
402          * alignment.  Second, if we took this signal because the stack
403          * is not aligned properly, we'd like to take the signal cleanly
404          * and report that.
405          */
406         sp &= ~7UL;
407
408         return (void __user *)(sp - framesize);
409 }
410
411 static inline void
412 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
413                int signo, sigset_t *oldset, siginfo_t *info)
414 {
415         struct rt_signal_frame __user *sf;
416         int sigframe_size, err;
417
418         /* 1. Make sure everything is clean */
419         synchronize_user_stack();
420         save_and_clear_fpu();
421         
422         sigframe_size = sizeof(struct rt_signal_frame);
423         if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
424                 sigframe_size -= sizeof(__siginfo_fpu_t);
425
426         sf = (struct rt_signal_frame __user *)
427                 get_sigframe(ka, regs, sigframe_size);
428         
429         if (invalid_frame_pointer (sf, sigframe_size))
430                 goto sigill;
431
432         if (get_thread_wsaved() != 0)
433                 goto sigill;
434
435         /* 2. Save the current process state */
436         err = copy_to_user(&sf->regs, regs, sizeof (*regs));
437
438         if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
439                 err |= save_fpu_state(regs, &sf->fpu_state);
440                 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
441         } else {
442                 err |= __put_user(0, &sf->fpu_save);
443         }
444         
445         /* Setup sigaltstack */
446         err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
447         err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
448         err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
449
450         err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
451
452         err |= copy_in_user((u64 __user *)sf,
453                             (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
454                             sizeof(struct reg_window));
455
456         if (info)
457                 err |= copy_siginfo_to_user(&sf->info, info);
458         else {
459                 err |= __put_user(signo, &sf->info.si_signo);
460                 err |= __put_user(SI_NOINFO, &sf->info.si_code);
461         }
462         if (err)
463                 goto sigsegv;
464         
465         /* 3. signal handler back-trampoline and parameters */
466         regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
467         regs->u_regs[UREG_I0] = signo;
468         regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
469
470         /* The sigcontext is passed in this way because of how it
471          * is defined in GLIBC's /usr/include/bits/sigcontext.h
472          * for sparc64.  It includes the 128 bytes of siginfo_t.
473          */
474         regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
475
476         /* 5. signal handler */
477         regs->tpc = (unsigned long) ka->sa.sa_handler;
478         regs->tnpc = (regs->tpc + 4);
479         if (test_thread_flag(TIF_32BIT)) {
480                 regs->tpc &= 0xffffffff;
481                 regs->tnpc &= 0xffffffff;
482         }
483         /* 4. return to kernel instructions */
484         regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
485         return;
486
487 sigill:
488         do_exit(SIGILL);
489 sigsegv:
490         force_sigsegv(signo, current);
491 }
492
493 static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
494                                  siginfo_t *info,
495                                  sigset_t *oldset, struct pt_regs *regs)
496 {
497         setup_rt_frame(ka, regs, signr, oldset,
498                        (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
499         spin_lock_irq(&current->sighand->siglock);
500         sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
501         if (!(ka->sa.sa_flags & SA_NOMASK))
502                 sigaddset(&current->blocked,signr);
503         recalc_sigpending();
504         spin_unlock_irq(&current->sighand->siglock);
505 }
506
507 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
508                                    struct sigaction *sa)
509 {
510         switch (regs->u_regs[UREG_I0]) {
511         case ERESTART_RESTARTBLOCK:
512         case ERESTARTNOHAND:
513         no_system_call_restart:
514                 regs->u_regs[UREG_I0] = EINTR;
515                 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
516                 break;
517         case ERESTARTSYS:
518                 if (!(sa->sa_flags & SA_RESTART))
519                         goto no_system_call_restart;
520                 /* fallthrough */
521         case ERESTARTNOINTR:
522                 regs->u_regs[UREG_I0] = orig_i0;
523                 regs->tpc -= 4;
524                 regs->tnpc -= 4;
525         }
526 }
527
528 /* Note that 'init' is a special process: it doesn't get signals it doesn't
529  * want to handle. Thus you cannot kill init even with a SIGKILL even by
530  * mistake.
531  */
532 static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
533 {
534         struct k_sigaction ka;
535         int restart_syscall;
536         sigset_t *oldset;
537         siginfo_t info;
538         int signr;
539         
540         if (pt_regs_is_syscall(regs) &&
541             (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
542                 restart_syscall = 1;
543         } else
544                 restart_syscall = 0;
545
546         if (current_thread_info()->status & TS_RESTORE_SIGMASK)
547                 oldset = &current->saved_sigmask;
548         else
549                 oldset = &current->blocked;
550
551 #ifdef CONFIG_COMPAT
552         if (test_thread_flag(TIF_32BIT)) {
553                 extern void do_signal32(sigset_t *, struct pt_regs *,
554                                         int restart_syscall,
555                                         unsigned long orig_i0);
556                 do_signal32(oldset, regs, restart_syscall, orig_i0);
557                 return;
558         }
559 #endif  
560
561         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
562
563         /* If the debugger messes with the program counter, it clears
564          * the software "in syscall" bit, directing us to not perform
565          * a syscall restart.
566          */
567         if (restart_syscall && !pt_regs_is_syscall(regs))
568                 restart_syscall = 0;
569
570         if (signr > 0) {
571                 if (restart_syscall)
572                         syscall_restart(orig_i0, regs, &ka.sa);
573                 handle_signal(signr, &ka, &info, oldset, regs);
574
575                 /* A signal was successfully delivered; the saved
576                  * sigmask will have been stored in the signal frame,
577                  * and will be restored by sigreturn, so we can simply
578                  * clear the TS_RESTORE_SIGMASK flag.
579                  */
580                 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
581
582                 tracehook_signal_handler(signr, &info, &ka, regs, 0);
583                 return;
584         }
585         if (restart_syscall &&
586             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
587              regs->u_regs[UREG_I0] == ERESTARTSYS ||
588              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
589                 /* replay the system call when we are done */
590                 regs->u_regs[UREG_I0] = orig_i0;
591                 regs->tpc -= 4;
592                 regs->tnpc -= 4;
593         }
594         if (restart_syscall &&
595             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
596                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
597                 regs->tpc -= 4;
598                 regs->tnpc -= 4;
599         }
600
601         /* If there's no signal to deliver, we just put the saved sigmask
602          * back
603          */
604         if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
605                 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
606                 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
607         }
608 }
609
610 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
611 {
612         if (thread_info_flags & _TIF_SIGPENDING)
613                 do_signal(regs, orig_i0);
614         if (thread_info_flags & _TIF_NOTIFY_RESUME) {
615                 clear_thread_flag(TIF_NOTIFY_RESUME);
616                 tracehook_notify_resume(regs);
617         }
618 }