sparc64: Kill bogus RT_ALIGNEDSZ macro from signal.c
[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 static long _sigpause_common(old_sigset_t set)
240 {
241         set &= _BLOCKABLE;
242         spin_lock_irq(&current->sighand->siglock);
243         current->saved_sigmask = current->blocked;
244         siginitset(&current->blocked, set);
245         recalc_sigpending();
246         spin_unlock_irq(&current->sighand->siglock);
247
248         current->state = TASK_INTERRUPTIBLE;
249         schedule();
250         set_thread_flag(TIF_RESTORE_SIGMASK);
251         return -ERESTARTNOHAND;
252 }
253
254 asmlinkage long sys_sigpause(unsigned int set)
255 {
256         return _sigpause_common(set);
257 }
258
259 asmlinkage long sys_sigsuspend(old_sigset_t set)
260 {
261         return _sigpause_common(set);
262 }
263
264 static inline int
265 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
266 {
267         unsigned long *fpregs = current_thread_info()->fpregs;
268         unsigned long fprs;
269         int err;
270
271         err = __get_user(fprs, &fpu->si_fprs);
272         fprs_write(0);
273         regs->tstate &= ~TSTATE_PEF;
274         if (fprs & FPRS_DL)
275                 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
276                                (sizeof(unsigned int) * 32));
277         if (fprs & FPRS_DU)
278                 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
279                                (sizeof(unsigned int) * 32));
280         err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
281         err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
282         current_thread_info()->fpsaved[0] |= fprs;
283         return err;
284 }
285
286 void do_rt_sigreturn(struct pt_regs *regs)
287 {
288         struct rt_signal_frame __user *sf;
289         unsigned long tpc, tnpc, tstate;
290         __siginfo_fpu_t __user *fpu_save;
291         sigset_t set;
292         int err;
293
294         /* Always make any pending restarted system calls return -EINTR */
295         current_thread_info()->restart_block.fn = do_no_restart_syscall;
296
297         synchronize_user_stack ();
298         sf = (struct rt_signal_frame __user *)
299                 (regs->u_regs [UREG_FP] + STACK_BIAS);
300
301         /* 1. Make sure we are not getting garbage from the user */
302         if (((unsigned long) sf) & 3)
303                 goto segv;
304
305         err = get_user(tpc, &sf->regs.tpc);
306         err |= __get_user(tnpc, &sf->regs.tnpc);
307         if (test_thread_flag(TIF_32BIT)) {
308                 tpc &= 0xffffffff;
309                 tnpc &= 0xffffffff;
310         }
311         err |= ((tpc | tnpc) & 3);
312
313         /* 2. Restore the state */
314         err |= __get_user(regs->y, &sf->regs.y);
315         err |= __get_user(tstate, &sf->regs.tstate);
316         err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
317
318         /* User can only change condition codes and %asi in %tstate. */
319         regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
320         regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
321
322         err |= __get_user(fpu_save, &sf->fpu_save);
323         if (fpu_save)
324                 err |= restore_fpu_state(regs, &sf->fpu_state);
325
326         err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
327         err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
328
329         if (err)
330                 goto segv;
331
332         regs->tpc = tpc;
333         regs->tnpc = tnpc;
334
335         sigdelsetmask(&set, ~_BLOCKABLE);
336         spin_lock_irq(&current->sighand->siglock);
337         current->blocked = set;
338         recalc_sigpending();
339         spin_unlock_irq(&current->sighand->siglock);
340         return;
341 segv:
342         force_sig(SIGSEGV, current);
343 }
344
345 /* Checks if the fp is valid */
346 static int invalid_frame_pointer(void __user *fp, int fplen)
347 {
348         if (((unsigned long) fp) & 7)
349                 return 1;
350         return 0;
351 }
352
353 static inline int
354 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
355 {
356         unsigned long *fpregs = current_thread_info()->fpregs;
357         unsigned long fprs;
358         int err = 0;
359         
360         fprs = current_thread_info()->fpsaved[0];
361         if (fprs & FPRS_DL)
362                 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
363                                     (sizeof(unsigned int) * 32));
364         if (fprs & FPRS_DU)
365                 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
366                                     (sizeof(unsigned int) * 32));
367         err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
368         err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
369         err |= __put_user(fprs, &fpu->si_fprs);
370
371         return err;
372 }
373
374 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
375 {
376         unsigned long sp;
377
378         sp = regs->u_regs[UREG_FP] + STACK_BIAS;
379
380         /* This is the X/Open sanctioned signal stack switching.  */
381         if (ka->sa.sa_flags & SA_ONSTACK) {
382                 if (!on_sig_stack(sp) &&
383                     !((current->sas_ss_sp + current->sas_ss_size) & 7))
384                         sp = current->sas_ss_sp + current->sas_ss_size;
385         }
386         return (void __user *)(sp - framesize);
387 }
388
389 static inline void
390 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
391                int signo, sigset_t *oldset, siginfo_t *info)
392 {
393         struct rt_signal_frame __user *sf;
394         int sigframe_size, err;
395
396         /* 1. Make sure everything is clean */
397         synchronize_user_stack();
398         save_and_clear_fpu();
399         
400         sigframe_size = sizeof(struct rt_signal_frame);
401         if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
402                 sigframe_size -= sizeof(__siginfo_fpu_t);
403
404         sf = (struct rt_signal_frame __user *)
405                 get_sigframe(ka, regs, sigframe_size);
406         
407         if (invalid_frame_pointer (sf, sigframe_size))
408                 goto sigill;
409
410         if (get_thread_wsaved() != 0)
411                 goto sigill;
412
413         /* 2. Save the current process state */
414         err = copy_to_user(&sf->regs, regs, sizeof (*regs));
415
416         if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
417                 err |= save_fpu_state(regs, &sf->fpu_state);
418                 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
419         } else {
420                 err |= __put_user(0, &sf->fpu_save);
421         }
422         
423         /* Setup sigaltstack */
424         err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
425         err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
426         err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
427
428         err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
429
430         err |= copy_in_user((u64 __user *)sf,
431                             (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
432                             sizeof(struct reg_window));
433
434         if (info)
435                 err |= copy_siginfo_to_user(&sf->info, info);
436         else {
437                 err |= __put_user(signo, &sf->info.si_signo);
438                 err |= __put_user(SI_NOINFO, &sf->info.si_code);
439         }
440         if (err)
441                 goto sigsegv;
442         
443         /* 3. signal handler back-trampoline and parameters */
444         regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
445         regs->u_regs[UREG_I0] = signo;
446         regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
447
448         /* The sigcontext is passed in this way because of how it
449          * is defined in GLIBC's /usr/include/bits/sigcontext.h
450          * for sparc64.  It includes the 128 bytes of siginfo_t.
451          */
452         regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
453
454         /* 5. signal handler */
455         regs->tpc = (unsigned long) ka->sa.sa_handler;
456         regs->tnpc = (regs->tpc + 4);
457         if (test_thread_flag(TIF_32BIT)) {
458                 regs->tpc &= 0xffffffff;
459                 regs->tnpc &= 0xffffffff;
460         }
461         /* 4. return to kernel instructions */
462         regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
463         return;
464
465 sigill:
466         do_exit(SIGILL);
467 sigsegv:
468         force_sigsegv(signo, current);
469 }
470
471 static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
472                                  siginfo_t *info,
473                                  sigset_t *oldset, struct pt_regs *regs)
474 {
475         setup_rt_frame(ka, regs, signr, oldset,
476                        (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
477         spin_lock_irq(&current->sighand->siglock);
478         sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
479         if (!(ka->sa.sa_flags & SA_NOMASK))
480                 sigaddset(&current->blocked,signr);
481         recalc_sigpending();
482         spin_unlock_irq(&current->sighand->siglock);
483 }
484
485 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
486                                      struct sigaction *sa)
487 {
488         switch (regs->u_regs[UREG_I0]) {
489         case ERESTART_RESTARTBLOCK:
490         case ERESTARTNOHAND:
491         no_system_call_restart:
492                 regs->u_regs[UREG_I0] = EINTR;
493                 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
494                 break;
495         case ERESTARTSYS:
496                 if (!(sa->sa_flags & SA_RESTART))
497                         goto no_system_call_restart;
498                 /* fallthrough */
499         case ERESTARTNOINTR:
500                 regs->u_regs[UREG_I0] = orig_i0;
501                 regs->tpc -= 4;
502                 regs->tnpc -= 4;
503         }
504 }
505
506 /* Note that 'init' is a special process: it doesn't get signals it doesn't
507  * want to handle. Thus you cannot kill init even with a SIGKILL even by
508  * mistake.
509  */
510 static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
511 {
512         struct signal_deliver_cookie cookie;
513         struct k_sigaction ka;
514         sigset_t *oldset;
515         siginfo_t info;
516         int signr, tt;
517         
518         tt = regs->magic & 0x1ff;
519         if (tt == 0x110 || tt == 0x111 || tt == 0x16d) {
520                 regs->magic &= ~0x1ff;
521                 cookie.restart_syscall = 1;
522         } else
523                 cookie.restart_syscall = 0;
524         cookie.orig_i0 = orig_i0;
525
526         if (test_thread_flag(TIF_RESTORE_SIGMASK))
527                 oldset = &current->saved_sigmask;
528         else
529                 oldset = &current->blocked;
530
531 #ifdef CONFIG_COMPAT
532         if (test_thread_flag(TIF_32BIT)) {
533                 extern void do_signal32(sigset_t *, struct pt_regs *,
534                                         struct signal_deliver_cookie *);
535                 do_signal32(oldset, regs, &cookie);
536                 return;
537         }
538 #endif  
539
540         signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
541         if (signr > 0) {
542                 if (cookie.restart_syscall)
543                         syscall_restart(cookie.orig_i0, regs, &ka.sa);
544                 handle_signal(signr, &ka, &info, oldset, regs);
545
546                 /* a signal was successfully delivered; the saved
547                  * sigmask will have been stored in the signal frame,
548                  * and will be restored by sigreturn, so we can simply
549                  * clear the TIF_RESTORE_SIGMASK flag.
550                  */
551                 if (test_thread_flag(TIF_RESTORE_SIGMASK))
552                         clear_thread_flag(TIF_RESTORE_SIGMASK);
553                 return;
554         }
555         if (cookie.restart_syscall &&
556             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
557              regs->u_regs[UREG_I0] == ERESTARTSYS ||
558              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
559                 /* replay the system call when we are done */
560                 regs->u_regs[UREG_I0] = cookie.orig_i0;
561                 regs->tpc -= 4;
562                 regs->tnpc -= 4;
563         }
564         if (cookie.restart_syscall &&
565             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
566                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
567                 regs->tpc -= 4;
568                 regs->tnpc -= 4;
569         }
570
571         /* if there's no signal to deliver, we just put the saved sigmask
572          * back
573          */
574         if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
575                 clear_thread_flag(TIF_RESTORE_SIGMASK);
576                 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
577         }
578 }
579
580 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
581 {
582         if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
583                 do_signal(regs, orig_i0);
584 }
585
586 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
587 {
588         struct signal_deliver_cookie *cp = cookie;
589
590         if (cp->restart_syscall &&
591             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
592              regs->u_regs[UREG_I0] == ERESTARTSYS ||
593              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
594                 /* replay the system call when we are done */
595                 regs->u_regs[UREG_I0] = cp->orig_i0;
596                 regs->tpc -= 4;
597                 regs->tnpc -= 4;
598                 cp->restart_syscall = 0;
599         }
600         if (cp->restart_syscall &&
601             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
602                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
603                 regs->tpc -= 4;
604                 regs->tnpc -= 4;
605                 cp->restart_syscall = 0;
606         }
607 }