Merge branch 'release' of git://lm-sensors.org/kernel/mhoffman/hwmon-2.6
[linux-2.6] / arch / sparc64 / kernel / signal.c
1 /*  $Id: signal.c,v 1.60 2002/02/09 19:49:31 davem Exp $
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_SPARC32_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/unistd.h>
21 #include <linux/mm.h>
22 #include <linux/tty.h>
23 #include <linux/binfmts.h>
24 #include <linux/bitops.h>
25
26 #include <asm/uaccess.h>
27 #include <asm/ptrace.h>
28 #include <asm/svr4.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 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
36
37 /* {set, get}context() needed for 64-bit SparcLinux userland. */
38 asmlinkage void sparc64_set_context(struct pt_regs *regs)
39 {
40         struct ucontext __user *ucp = (struct ucontext __user *)
41                 regs->u_regs[UREG_I0];
42         mc_gregset_t __user *grp;
43         unsigned long pc, npc, tstate;
44         unsigned long fp, i7;
45         unsigned char fenab;
46         int err;
47
48         flush_user_windows();
49         if (get_thread_wsaved()                                 ||
50             (((unsigned long)ucp) & (sizeof(unsigned long)-1))  ||
51             (!__access_ok(ucp, sizeof(*ucp))))
52                 goto do_sigsegv;
53         grp  = &ucp->uc_mcontext.mc_gregs;
54         err  = __get_user(pc, &((*grp)[MC_PC]));
55         err |= __get_user(npc, &((*grp)[MC_NPC]));
56         if (err || ((pc | npc) & 3))
57                 goto do_sigsegv;
58         if (regs->u_regs[UREG_I1]) {
59                 sigset_t set;
60
61                 if (_NSIG_WORDS == 1) {
62                         if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
63                                 goto do_sigsegv;
64                 } else {
65                         if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
66                                 goto do_sigsegv;
67                 }
68                 sigdelsetmask(&set, ~_BLOCKABLE);
69                 spin_lock_irq(&current->sighand->siglock);
70                 current->blocked = set;
71                 recalc_sigpending();
72                 spin_unlock_irq(&current->sighand->siglock);
73         }
74         if (test_thread_flag(TIF_32BIT)) {
75                 pc &= 0xffffffff;
76                 npc &= 0xffffffff;
77         }
78         regs->tpc = pc;
79         regs->tnpc = npc;
80         err |= __get_user(regs->y, &((*grp)[MC_Y]));
81         err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
82         regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
83         regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
84         err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
85         err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
86         err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
87         err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
88         err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
89         err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
90         err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7]));
91         err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
92         err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
93         err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
94         err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
95         err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
96         err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
97         err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
98         err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
99
100         err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
101         err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
102         err |= __put_user(fp,
103               (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
104         err |= __put_user(i7,
105               (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
106
107         err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
108         if (fenab) {
109                 unsigned long *fpregs = current_thread_info()->fpregs;
110                 unsigned long fprs;
111                 
112                 fprs_write(0);
113                 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
114                 if (fprs & FPRS_DL)
115                         err |= copy_from_user(fpregs,
116                                               &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
117                                               (sizeof(unsigned int) * 32));
118                 if (fprs & FPRS_DU)
119                         err |= copy_from_user(fpregs+16,
120                          ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
121                          (sizeof(unsigned int) * 32));
122                 err |= __get_user(current_thread_info()->xfsr[0],
123                                   &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
124                 err |= __get_user(current_thread_info()->gsr[0],
125                                   &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
126                 regs->tstate &= ~TSTATE_PEF;
127         }
128         if (err)
129                 goto do_sigsegv;
130
131         return;
132 do_sigsegv:
133         force_sig(SIGSEGV, current);
134 }
135
136 asmlinkage void sparc64_get_context(struct pt_regs *regs)
137 {
138         struct ucontext __user *ucp = (struct ucontext __user *)
139                 regs->u_regs[UREG_I0];
140         mc_gregset_t __user *grp;
141         mcontext_t __user *mcp;
142         unsigned long fp, i7;
143         unsigned char fenab;
144         int err;
145
146         synchronize_user_stack();
147         if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
148                 goto do_sigsegv;
149
150 #if 1
151         fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
152 #else
153         fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
154 #endif
155                 
156         mcp = &ucp->uc_mcontext;
157         grp = &mcp->mc_gregs;
158
159         /* Skip over the trap instruction, first. */
160         if (test_thread_flag(TIF_32BIT)) {
161                 regs->tpc   = (regs->tnpc & 0xffffffff);
162                 regs->tnpc  = (regs->tnpc + 4) & 0xffffffff;
163         } else {
164                 regs->tpc   = regs->tnpc;
165                 regs->tnpc += 4;
166         }
167         err = 0;
168         if (_NSIG_WORDS == 1)
169                 err |= __put_user(current->blocked.sig[0],
170                                   (unsigned long __user *)&ucp->uc_sigmask);
171         else
172                 err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
173                                       sizeof(sigset_t));
174
175         err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
176         err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
177         err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
178         err |= __put_user(regs->y, &((*grp)[MC_Y]));
179         err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
180         err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
181         err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
182         err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
183         err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
184         err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
185         err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
186         err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
187         err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
188         err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
189         err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
190         err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
191         err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
192         err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
193         err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
194
195         err |= __get_user(fp,
196                  (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
197         err |= __get_user(i7,
198                  (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
199         err |= __put_user(fp, &(mcp->mc_fp));
200         err |= __put_user(i7, &(mcp->mc_i7));
201
202         err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
203         if (fenab) {
204                 unsigned long *fpregs = current_thread_info()->fpregs;
205                 unsigned long fprs;
206                 
207                 fprs = current_thread_info()->fpsaved[0];
208                 if (fprs & FPRS_DL)
209                         err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
210                                             (sizeof(unsigned int) * 32));
211                 if (fprs & FPRS_DU)
212                         err |= copy_to_user(
213                           ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
214                           (sizeof(unsigned int) * 32));
215                 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
216                 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
217                 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
218         }
219         if (err)
220                 goto do_sigsegv;
221
222         return;
223 do_sigsegv:
224         force_sig(SIGSEGV, current);
225 }
226
227 struct rt_signal_frame {
228         struct sparc_stackf     ss;
229         siginfo_t               info;
230         struct pt_regs          regs;
231         __siginfo_fpu_t __user  *fpu_save;
232         stack_t                 stack;
233         sigset_t                mask;
234         __siginfo_fpu_t         fpu_state;
235 };
236
237 /* Align macros */
238 #define RT_ALIGNEDSZ  (((sizeof(struct rt_signal_frame) + 7) & (~7)))
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         set_thread_flag(TIF_RESTORE_SIGMASK);
252         return -ERESTARTNOHAND;
253 }
254
255 asmlinkage long sys_sigpause(unsigned int set)
256 {
257         return _sigpause_common(set);
258 }
259
260 asmlinkage long sys_sigsuspend(old_sigset_t set)
261 {
262         return _sigpause_common(set);
263 }
264
265 static inline int
266 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
267 {
268         unsigned long *fpregs = current_thread_info()->fpregs;
269         unsigned long fprs;
270         int err;
271
272         err = __get_user(fprs, &fpu->si_fprs);
273         fprs_write(0);
274         regs->tstate &= ~TSTATE_PEF;
275         if (fprs & FPRS_DL)
276                 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
277                                (sizeof(unsigned int) * 32));
278         if (fprs & FPRS_DU)
279                 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
280                                (sizeof(unsigned int) * 32));
281         err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
282         err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
283         current_thread_info()->fpsaved[0] |= fprs;
284         return err;
285 }
286
287 void do_rt_sigreturn(struct pt_regs *regs)
288 {
289         struct rt_signal_frame __user *sf;
290         unsigned long tpc, tnpc, tstate;
291         __siginfo_fpu_t __user *fpu_save;
292         sigset_t set;
293         int err;
294
295         /* Always make any pending restarted system calls return -EINTR */
296         current_thread_info()->restart_block.fn = do_no_restart_syscall;
297
298         synchronize_user_stack ();
299         sf = (struct rt_signal_frame __user *)
300                 (regs->u_regs [UREG_FP] + STACK_BIAS);
301
302         /* 1. Make sure we are not getting garbage from the user */
303         if (((unsigned long) sf) & 3)
304                 goto segv;
305
306         err = get_user(tpc, &sf->regs.tpc);
307         err |= __get_user(tnpc, &sf->regs.tnpc);
308         if (test_thread_flag(TIF_32BIT)) {
309                 tpc &= 0xffffffff;
310                 tnpc &= 0xffffffff;
311         }
312         err |= ((tpc | tnpc) & 3);
313
314         /* 2. Restore the state */
315         err |= __get_user(regs->y, &sf->regs.y);
316         err |= __get_user(tstate, &sf->regs.tstate);
317         err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
318
319         /* User can only change condition codes and %asi in %tstate. */
320         regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
321         regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
322
323         err |= __get_user(fpu_save, &sf->fpu_save);
324         if (fpu_save)
325                 err |= restore_fpu_state(regs, &sf->fpu_state);
326
327         err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
328         err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
329
330         if (err)
331                 goto segv;
332
333         regs->tpc = tpc;
334         regs->tnpc = tnpc;
335
336         sigdelsetmask(&set, ~_BLOCKABLE);
337         spin_lock_irq(&current->sighand->siglock);
338         current->blocked = set;
339         recalc_sigpending();
340         spin_unlock_irq(&current->sighand->siglock);
341         return;
342 segv:
343         force_sig(SIGSEGV, current);
344 }
345
346 /* Checks if the fp is valid */
347 static int invalid_frame_pointer(void __user *fp, int fplen)
348 {
349         if (((unsigned long) fp) & 7)
350                 return 1;
351         return 0;
352 }
353
354 static inline int
355 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
356 {
357         unsigned long *fpregs = (unsigned long *)(regs+1);
358         unsigned long fprs;
359         int err = 0;
360         
361         fprs = current_thread_info()->fpsaved[0];
362         if (fprs & FPRS_DL)
363                 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
364                                     (sizeof(unsigned int) * 32));
365         if (fprs & FPRS_DU)
366                 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
367                                     (sizeof(unsigned int) * 32));
368         err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
369         err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
370         err |= __put_user(fprs, &fpu->si_fprs);
371
372         return err;
373 }
374
375 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
376 {
377         unsigned long sp;
378
379         sp = regs->u_regs[UREG_FP] + STACK_BIAS;
380
381         /* This is the X/Open sanctioned signal stack switching.  */
382         if (ka->sa.sa_flags & SA_ONSTACK) {
383                 if (!on_sig_stack(sp) &&
384                     !((current->sas_ss_sp + current->sas_ss_size) & 7))
385                         sp = current->sas_ss_sp + current->sas_ss_size;
386         }
387         return (void __user *)(sp - framesize);
388 }
389
390 static inline void
391 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
392                int signo, sigset_t *oldset, siginfo_t *info)
393 {
394         struct rt_signal_frame __user *sf;
395         int sigframe_size, err;
396
397         /* 1. Make sure everything is clean */
398         synchronize_user_stack();
399         save_and_clear_fpu();
400         
401         sigframe_size = RT_ALIGNEDSZ;
402         if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
403                 sigframe_size -= sizeof(__siginfo_fpu_t);
404
405         sf = (struct rt_signal_frame __user *)
406                 get_sigframe(ka, regs, sigframe_size);
407         
408         if (invalid_frame_pointer (sf, sigframe_size))
409                 goto sigill;
410
411         if (get_thread_wsaved() != 0)
412                 goto sigill;
413
414         /* 2. Save the current process state */
415         err = copy_to_user(&sf->regs, regs, sizeof (*regs));
416
417         if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
418                 err |= save_fpu_state(regs, &sf->fpu_state);
419                 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
420         } else {
421                 err |= __put_user(0, &sf->fpu_save);
422         }
423         
424         /* Setup sigaltstack */
425         err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
426         err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
427         err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
428
429         err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
430
431         err |= copy_in_user((u64 __user *)sf,
432                             (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
433                             sizeof(struct reg_window));
434
435         if (info)
436                 err |= copy_siginfo_to_user(&sf->info, info);
437         else {
438                 err |= __put_user(signo, &sf->info.si_signo);
439                 err |= __put_user(SI_NOINFO, &sf->info.si_code);
440         }
441         if (err)
442                 goto sigsegv;
443         
444         /* 3. signal handler back-trampoline and parameters */
445         regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
446         regs->u_regs[UREG_I0] = signo;
447         regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
448
449         /* The sigcontext is passed in this way because of how it
450          * is defined in GLIBC's /usr/include/bits/sigcontext.h
451          * for sparc64.  It includes the 128 bytes of siginfo_t.
452          */
453         regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
454
455         /* 5. signal handler */
456         regs->tpc = (unsigned long) ka->sa.sa_handler;
457         regs->tnpc = (regs->tpc + 4);
458         if (test_thread_flag(TIF_32BIT)) {
459                 regs->tpc &= 0xffffffff;
460                 regs->tnpc &= 0xffffffff;
461         }
462         /* 4. return to kernel instructions */
463         regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
464         return;
465
466 sigill:
467         do_exit(SIGILL);
468 sigsegv:
469         force_sigsegv(signo, current);
470 }
471
472 static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
473                                  siginfo_t *info,
474                                  sigset_t *oldset, struct pt_regs *regs)
475 {
476         setup_rt_frame(ka, regs, signr, oldset,
477                        (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
478         spin_lock_irq(&current->sighand->siglock);
479         sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
480         if (!(ka->sa.sa_flags & SA_NOMASK))
481                 sigaddset(&current->blocked,signr);
482         recalc_sigpending();
483         spin_unlock_irq(&current->sighand->siglock);
484 }
485
486 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
487                                      struct sigaction *sa)
488 {
489         switch (regs->u_regs[UREG_I0]) {
490         case ERESTART_RESTARTBLOCK:
491         case ERESTARTNOHAND:
492         no_system_call_restart:
493                 regs->u_regs[UREG_I0] = EINTR;
494                 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
495                 break;
496         case ERESTARTSYS:
497                 if (!(sa->sa_flags & SA_RESTART))
498                         goto no_system_call_restart;
499                 /* fallthrough */
500         case ERESTARTNOINTR:
501                 regs->u_regs[UREG_I0] = orig_i0;
502                 regs->tpc -= 4;
503                 regs->tnpc -= 4;
504         }
505 }
506
507 /* Note that 'init' is a special process: it doesn't get signals it doesn't
508  * want to handle. Thus you cannot kill init even with a SIGKILL even by
509  * mistake.
510  */
511 static void do_signal(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall)
512 {
513         siginfo_t info;
514         struct signal_deliver_cookie cookie;
515         struct k_sigaction ka;
516         int signr;
517         sigset_t *oldset;
518         
519         cookie.restart_syscall = restart_syscall;
520         cookie.orig_i0 = orig_i0;
521
522         if (test_thread_flag(TIF_RESTORE_SIGMASK))
523                 oldset = &current->saved_sigmask;
524         else
525                 oldset = &current->blocked;
526
527 #ifdef CONFIG_SPARC32_COMPAT
528         if (test_thread_flag(TIF_32BIT)) {
529                 extern void do_signal32(sigset_t *, struct pt_regs *,
530                                         unsigned long, int);
531                 do_signal32(oldset, regs, orig_i0,
532                             cookie.restart_syscall);
533                 return;
534         }
535 #endif  
536
537         signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
538         if (signr > 0) {
539                 if (cookie.restart_syscall)
540                         syscall_restart(orig_i0, regs, &ka.sa);
541                 handle_signal(signr, &ka, &info, oldset, regs);
542
543                 /* a signal was successfully delivered; the saved
544                  * sigmask will have been stored in the signal frame,
545                  * and will be restored by sigreturn, so we can simply
546                  * clear the TIF_RESTORE_SIGMASK flag.
547                  */
548                 if (test_thread_flag(TIF_RESTORE_SIGMASK))
549                         clear_thread_flag(TIF_RESTORE_SIGMASK);
550                 return;
551         }
552         if (cookie.restart_syscall &&
553             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
554              regs->u_regs[UREG_I0] == ERESTARTSYS ||
555              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
556                 /* replay the system call when we are done */
557                 regs->u_regs[UREG_I0] = cookie.orig_i0;
558                 regs->tpc -= 4;
559                 regs->tnpc -= 4;
560         }
561         if (cookie.restart_syscall &&
562             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
563                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
564                 regs->tpc -= 4;
565                 regs->tnpc -= 4;
566         }
567
568         /* if there's no signal to deliver, we just put the saved sigmask
569          * back
570          */
571         if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
572                 clear_thread_flag(TIF_RESTORE_SIGMASK);
573                 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
574         }
575 }
576
577 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall,
578                       unsigned long thread_info_flags)
579 {
580         if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
581                 do_signal(regs, orig_i0, restart_syscall);
582 }
583
584 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
585 {
586         struct signal_deliver_cookie *cp = cookie;
587
588         if (cp->restart_syscall &&
589             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
590              regs->u_regs[UREG_I0] == ERESTARTSYS ||
591              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
592                 /* replay the system call when we are done */
593                 regs->u_regs[UREG_I0] = cp->orig_i0;
594                 regs->tpc -= 4;
595                 regs->tnpc -= 4;
596                 cp->restart_syscall = 0;
597         }
598         if (cp->restart_syscall &&
599             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
600                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
601                 regs->tpc -= 4;
602                 regs->tnpc -= 4;
603                 cp->restart_syscall = 0;
604         }
605 }