sparc: sunzilog.c remove unused argument
[linux-2.6.git] / 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_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/pgtable.h>
29 #include <asm/fpumacro.h>
30 #include <asm/uctx.h>
31 #include <asm/siginfo.h>
32 #include <asm/visasm.h>
33
34 #include "entry.h"
35 #include "systbls.h"
36
37 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
38
39 /* {set, get}context() needed for 64-bit SparcLinux userland. */
40 asmlinkage void sparc64_set_context(struct pt_regs *regs)
41 {
42         struct ucontext __user *ucp = (struct ucontext __user *)
43                 regs->u_regs[UREG_I0];
44         mc_gregset_t __user *grp;
45         unsigned long pc, npc, tstate;
46         unsigned long fp, i7;
47         unsigned char fenab;
48         int err;
49
50         flush_user_windows();
51         if (get_thread_wsaved()                                 ||
52             (((unsigned long)ucp) & (sizeof(unsigned long)-1))  ||
53             (!__access_ok(ucp, sizeof(*ucp))))
54                 goto do_sigsegv;
55         grp  = &ucp->uc_mcontext.mc_gregs;
56         err  = __get_user(pc, &((*grp)[MC_PC]));
57         err |= __get_user(npc, &((*grp)[MC_NPC]));
58         if (err || ((pc | npc) & 3))
59                 goto do_sigsegv;
60         if (regs->u_regs[UREG_I1]) {
61                 sigset_t set;
62
63                 if (_NSIG_WORDS == 1) {
64                         if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
65                                 goto do_sigsegv;
66                 } else {
67                         if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
68                                 goto do_sigsegv;
69                 }
70                 sigdelsetmask(&set, ~_BLOCKABLE);
71                 spin_lock_irq(&current->sighand->siglock);
72                 current->blocked = set;
73                 recalc_sigpending();
74                 spin_unlock_irq(&current->sighand->siglock);
75         }
76         if (test_thread_flag(TIF_32BIT)) {
77                 pc &= 0xffffffff;
78                 npc &= 0xffffffff;
79         }
80         regs->tpc = pc;
81         regs->tnpc = npc;
82         err |= __get_user(regs->y, &((*grp)[MC_Y]));
83         err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
84         regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
85         regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
86         err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
87         err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
88         err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
89         err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
90         err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
91         err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
92         err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7]));
93         err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
94         err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
95         err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
96         err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
97         err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
98         err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
99         err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
100         err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
101
102         err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
103         err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
104         err |= __put_user(fp,
105               (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
106         err |= __put_user(i7,
107               (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
108
109         err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
110         if (fenab) {
111                 unsigned long *fpregs = current_thread_info()->fpregs;
112                 unsigned long fprs;
113                 
114                 fprs_write(0);
115                 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
116                 if (fprs & FPRS_DL)
117                         err |= copy_from_user(fpregs,
118                                               &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
119                                               (sizeof(unsigned int) * 32));
120                 if (fprs & FPRS_DU)
121                         err |= copy_from_user(fpregs+16,
122                          ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
123                          (sizeof(unsigned int) * 32));
124                 err |= __get_user(current_thread_info()->xfsr[0],
125                                   &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
126                 err |= __get_user(current_thread_info()->gsr[0],
127                                   &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
128                 regs->tstate &= ~TSTATE_PEF;
129         }
130         if (err)
131                 goto do_sigsegv;
132
133         return;
134 do_sigsegv:
135         force_sig(SIGSEGV, current);
136 }
137
138 asmlinkage void sparc64_get_context(struct pt_regs *regs)
139 {
140         struct ucontext __user *ucp = (struct ucontext __user *)
141                 regs->u_regs[UREG_I0];
142         mc_gregset_t __user *grp;
143         mcontext_t __user *mcp;
144         unsigned long fp, i7;
145         unsigned char fenab;
146         int err;
147
148         synchronize_user_stack();
149         if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
150                 goto do_sigsegv;
151
152 #if 1
153         fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
154 #else
155         fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
156 #endif
157                 
158         mcp = &ucp->uc_mcontext;
159         grp = &mcp->mc_gregs;
160
161         /* Skip over the trap instruction, first. */
162         if (test_thread_flag(TIF_32BIT)) {
163                 regs->tpc   = (regs->tnpc & 0xffffffff);
164                 regs->tnpc  = (regs->tnpc + 4) & 0xffffffff;
165         } else {
166                 regs->tpc   = regs->tnpc;
167                 regs->tnpc += 4;
168         }
169         err = 0;
170         if (_NSIG_WORDS == 1)
171                 err |= __put_user(current->blocked.sig[0],
172                                   (unsigned long __user *)&ucp->uc_sigmask);
173         else
174                 err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
175                                       sizeof(sigset_t));
176
177         err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
178         err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
179         err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
180         err |= __put_user(regs->y, &((*grp)[MC_Y]));
181         err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
182         err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
183         err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
184         err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
185         err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
186         err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
187         err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
188         err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
189         err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
190         err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
191         err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
192         err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
193         err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
194         err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
195         err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
196
197         err |= __get_user(fp,
198                  (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
199         err |= __get_user(i7,
200                  (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
201         err |= __put_user(fp, &(mcp->mc_fp));
202         err |= __put_user(i7, &(mcp->mc_i7));
203
204         err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
205         if (fenab) {
206                 unsigned long *fpregs = current_thread_info()->fpregs;
207                 unsigned long fprs;
208                 
209                 fprs = current_thread_info()->fpsaved[0];
210                 if (fprs & FPRS_DL)
211                         err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
212                                             (sizeof(unsigned int) * 32));
213                 if (fprs & FPRS_DU)
214                         err |= copy_to_user(
215                           ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
216                           (sizeof(unsigned int) * 32));
217                 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
218                 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
219                 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
220         }
221         if (err)
222                 goto do_sigsegv;
223
224         return;
225 do_sigsegv:
226         force_sig(SIGSEGV, current);
227 }
228
229 struct rt_signal_frame {
230         struct sparc_stackf     ss;
231         siginfo_t               info;
232         struct pt_regs          regs;
233         __siginfo_fpu_t __user  *fpu_save;
234         stack_t                 stack;
235         sigset_t                mask;
236         __siginfo_fpu_t         fpu_state;
237 };
238
239 /* Align macros */
240 #define RT_ALIGNEDSZ  (((sizeof(struct rt_signal_frame) + 7) & (~7)))
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         set_thread_flag(TIF_RESTORE_SIGMASK);
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         sigdelsetmask(&set, ~_BLOCKABLE);
339         spin_lock_irq(&current->sighand->siglock);
340         current->blocked = set;
341         recalc_sigpending();
342         spin_unlock_irq(&current->sighand->siglock);
343         return;
344 segv:
345         force_sig(SIGSEGV, current);
346 }
347
348 /* Checks if the fp is valid */
349 static int invalid_frame_pointer(void __user *fp, int fplen)
350 {
351         if (((unsigned long) fp) & 7)
352                 return 1;
353         return 0;
354 }
355
356 static inline int
357 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
358 {
359         unsigned long *fpregs = current_thread_info()->fpregs;
360         unsigned long fprs;
361         int err = 0;
362         
363         fprs = current_thread_info()->fpsaved[0];
364         if (fprs & FPRS_DL)
365                 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
366                                     (sizeof(unsigned int) * 32));
367         if (fprs & FPRS_DU)
368                 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
369                                     (sizeof(unsigned int) * 32));
370         err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
371         err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
372         err |= __put_user(fprs, &fpu->si_fprs);
373
374         return err;
375 }
376
377 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
378 {
379         unsigned long sp;
380
381         sp = regs->u_regs[UREG_FP] + STACK_BIAS;
382
383         /* This is the X/Open sanctioned signal stack switching.  */
384         if (ka->sa.sa_flags & SA_ONSTACK) {
385                 if (!on_sig_stack(sp) &&
386                     !((current->sas_ss_sp + current->sas_ss_size) & 7))
387                         sp = current->sas_ss_sp + current->sas_ss_size;
388         }
389         return (void __user *)(sp - framesize);
390 }
391
392 static inline void
393 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
394                int signo, sigset_t *oldset, siginfo_t *info)
395 {
396         struct rt_signal_frame __user *sf;
397         int sigframe_size, err;
398
399         /* 1. Make sure everything is clean */
400         synchronize_user_stack();
401         save_and_clear_fpu();
402         
403         sigframe_size = RT_ALIGNEDSZ;
404         if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
405                 sigframe_size -= sizeof(__siginfo_fpu_t);
406
407         sf = (struct rt_signal_frame __user *)
408                 get_sigframe(ka, regs, sigframe_size);
409         
410         if (invalid_frame_pointer (sf, sigframe_size))
411                 goto sigill;
412
413         if (get_thread_wsaved() != 0)
414                 goto sigill;
415
416         /* 2. Save the current process state */
417         err = copy_to_user(&sf->regs, regs, sizeof (*regs));
418
419         if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
420                 err |= save_fpu_state(regs, &sf->fpu_state);
421                 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
422         } else {
423                 err |= __put_user(0, &sf->fpu_save);
424         }
425         
426         /* Setup sigaltstack */
427         err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
428         err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
429         err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
430
431         err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
432
433         err |= copy_in_user((u64 __user *)sf,
434                             (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
435                             sizeof(struct reg_window));
436
437         if (info)
438                 err |= copy_siginfo_to_user(&sf->info, info);
439         else {
440                 err |= __put_user(signo, &sf->info.si_signo);
441                 err |= __put_user(SI_NOINFO, &sf->info.si_code);
442         }
443         if (err)
444                 goto sigsegv;
445         
446         /* 3. signal handler back-trampoline and parameters */
447         regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
448         regs->u_regs[UREG_I0] = signo;
449         regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
450
451         /* The sigcontext is passed in this way because of how it
452          * is defined in GLIBC's /usr/include/bits/sigcontext.h
453          * for sparc64.  It includes the 128 bytes of siginfo_t.
454          */
455         regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
456
457         /* 5. signal handler */
458         regs->tpc = (unsigned long) ka->sa.sa_handler;
459         regs->tnpc = (regs->tpc + 4);
460         if (test_thread_flag(TIF_32BIT)) {
461                 regs->tpc &= 0xffffffff;
462                 regs->tnpc &= 0xffffffff;
463         }
464         /* 4. return to kernel instructions */
465         regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
466         return;
467
468 sigill:
469         do_exit(SIGILL);
470 sigsegv:
471         force_sigsegv(signo, current);
472 }
473
474 static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
475                                  siginfo_t *info,
476                                  sigset_t *oldset, struct pt_regs *regs)
477 {
478         setup_rt_frame(ka, regs, signr, oldset,
479                        (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
480         spin_lock_irq(&current->sighand->siglock);
481         sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
482         if (!(ka->sa.sa_flags & SA_NOMASK))
483                 sigaddset(&current->blocked,signr);
484         recalc_sigpending();
485         spin_unlock_irq(&current->sighand->siglock);
486 }
487
488 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
489                                      struct sigaction *sa)
490 {
491         switch (regs->u_regs[UREG_I0]) {
492         case ERESTART_RESTARTBLOCK:
493         case ERESTARTNOHAND:
494         no_system_call_restart:
495                 regs->u_regs[UREG_I0] = EINTR;
496                 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
497                 break;
498         case ERESTARTSYS:
499                 if (!(sa->sa_flags & SA_RESTART))
500                         goto no_system_call_restart;
501                 /* fallthrough */
502         case ERESTARTNOINTR:
503                 regs->u_regs[UREG_I0] = orig_i0;
504                 regs->tpc -= 4;
505                 regs->tnpc -= 4;
506         }
507 }
508
509 /* Note that 'init' is a special process: it doesn't get signals it doesn't
510  * want to handle. Thus you cannot kill init even with a SIGKILL even by
511  * mistake.
512  */
513 static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
514 {
515         struct signal_deliver_cookie cookie;
516         struct k_sigaction ka;
517         sigset_t *oldset;
518         siginfo_t info;
519         int signr, tt;
520         
521         tt = regs->magic & 0x1ff;
522         if (tt == 0x110 || tt == 0x111 || tt == 0x16d) {
523                 regs->magic &= ~0x1ff;
524                 cookie.restart_syscall = 1;
525         } else
526                 cookie.restart_syscall = 0;
527         cookie.orig_i0 = orig_i0;
528
529         if (test_thread_flag(TIF_RESTORE_SIGMASK))
530                 oldset = &current->saved_sigmask;
531         else
532                 oldset = &current->blocked;
533
534 #ifdef CONFIG_COMPAT
535         if (test_thread_flag(TIF_32BIT)) {
536                 extern void do_signal32(sigset_t *, struct pt_regs *,
537                                         struct signal_deliver_cookie *);
538                 do_signal32(oldset, regs, &cookie);
539                 return;
540         }
541 #endif  
542
543         signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
544         if (signr > 0) {
545                 if (cookie.restart_syscall)
546                         syscall_restart(cookie.orig_i0, regs, &ka.sa);
547                 handle_signal(signr, &ka, &info, oldset, regs);
548
549                 /* a signal was successfully delivered; the saved
550                  * sigmask will have been stored in the signal frame,
551                  * and will be restored by sigreturn, so we can simply
552                  * clear the TIF_RESTORE_SIGMASK flag.
553                  */
554                 if (test_thread_flag(TIF_RESTORE_SIGMASK))
555                         clear_thread_flag(TIF_RESTORE_SIGMASK);
556                 return;
557         }
558         if (cookie.restart_syscall &&
559             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
560              regs->u_regs[UREG_I0] == ERESTARTSYS ||
561              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
562                 /* replay the system call when we are done */
563                 regs->u_regs[UREG_I0] = cookie.orig_i0;
564                 regs->tpc -= 4;
565                 regs->tnpc -= 4;
566         }
567         if (cookie.restart_syscall &&
568             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
569                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
570                 regs->tpc -= 4;
571                 regs->tnpc -= 4;
572         }
573
574         /* if there's no signal to deliver, we just put the saved sigmask
575          * back
576          */
577         if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
578                 clear_thread_flag(TIF_RESTORE_SIGMASK);
579                 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
580         }
581 }
582
583 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
584 {
585         if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
586                 do_signal(regs, orig_i0);
587 }
588
589 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
590 {
591         struct signal_deliver_cookie *cp = cookie;
592
593         if (cp->restart_syscall &&
594             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
595              regs->u_regs[UREG_I0] == ERESTARTSYS ||
596              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
597                 /* replay the system call when we are done */
598                 regs->u_regs[UREG_I0] = cp->orig_i0;
599                 regs->tpc -= 4;
600                 regs->tnpc -= 4;
601                 cp->restart_syscall = 0;
602         }
603         if (cp->restart_syscall &&
604             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
605                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
606                 regs->tpc -= 4;
607                 regs->tnpc -= 4;
608                 cp->restart_syscall = 0;
609         }
610 }