b27934671c35324b713d355b6119541b3c8e69df
[linux-3.10.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 #include <linux/config.h>
12 #ifdef CONFIG_SPARC32_COMPAT
13 #include <linux/compat.h>       /* for compat_old_sigset_t */
14 #endif
15 #include <linux/sched.h>
16 #include <linux/kernel.h>
17 #include <linux/signal.h>
18 #include <linux/errno.h>
19 #include <linux/wait.h>
20 #include <linux/ptrace.h>
21 #include <linux/unistd.h>
22 #include <linux/mm.h>
23 #include <linux/tty.h>
24 #include <linux/smp_lock.h>
25 #include <linux/binfmts.h>
26 #include <linux/bitops.h>
27
28 #include <asm/uaccess.h>
29 #include <asm/ptrace.h>
30 #include <asm/svr4.h>
31 #include <asm/pgtable.h>
32 #include <asm/fpumacro.h>
33 #include <asm/uctx.h>
34 #include <asm/siginfo.h>
35 #include <asm/visasm.h>
36
37 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
38
39 static int do_signal(sigset_t *oldset, struct pt_regs * regs,
40                      unsigned long orig_o0, int ret_from_syscall);
41
42 /* {set, get}context() needed for 64-bit SparcLinux userland. */
43 asmlinkage void sparc64_set_context(struct pt_regs *regs)
44 {
45         struct ucontext __user *ucp = (struct ucontext __user *)
46                 regs->u_regs[UREG_I0];
47         mc_gregset_t __user *grp;
48         unsigned long pc, npc, tstate;
49         unsigned long fp, i7;
50         unsigned char fenab;
51         int err;
52
53         flush_user_windows();
54         if (get_thread_wsaved()                                 ||
55             (((unsigned long)ucp) & (sizeof(unsigned long)-1))  ||
56             (!__access_ok(ucp, sizeof(*ucp))))
57                 goto do_sigsegv;
58         grp  = &ucp->uc_mcontext.mc_gregs;
59         err  = __get_user(pc, &((*grp)[MC_PC]));
60         err |= __get_user(npc, &((*grp)[MC_NPC]));
61         if (err || ((pc | npc) & 3))
62                 goto do_sigsegv;
63         if (regs->u_regs[UREG_I1]) {
64                 sigset_t set;
65
66                 if (_NSIG_WORDS == 1) {
67                         if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
68                                 goto do_sigsegv;
69                 } else {
70                         if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
71                                 goto do_sigsegv;
72                 }
73                 sigdelsetmask(&set, ~_BLOCKABLE);
74                 spin_lock_irq(&current->sighand->siglock);
75                 current->blocked = set;
76                 recalc_sigpending();
77                 spin_unlock_irq(&current->sighand->siglock);
78         }
79         if (test_thread_flag(TIF_32BIT)) {
80                 pc &= 0xffffffff;
81                 npc &= 0xffffffff;
82         }
83         regs->tpc = pc;
84         regs->tnpc = npc;
85         err |= __get_user(regs->y, &((*grp)[MC_Y]));
86         err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
87         regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
88         regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
89         err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
90         err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
91         err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
92         err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
93         err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
94         err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
95         err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7]));
96         err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
97         err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
98         err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
99         err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
100         err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
101         err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
102         err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
103         err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
104
105         err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
106         err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
107         err |= __put_user(fp,
108               (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
109         err |= __put_user(i7,
110               (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
111
112         err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
113         if (fenab) {
114                 unsigned long *fpregs = current_thread_info()->fpregs;
115                 unsigned long fprs;
116                 
117                 fprs_write(0);
118                 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
119                 if (fprs & FPRS_DL)
120                         err |= copy_from_user(fpregs,
121                                               &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
122                                               (sizeof(unsigned int) * 32));
123                 if (fprs & FPRS_DU)
124                         err |= copy_from_user(fpregs+16,
125                          ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
126                          (sizeof(unsigned int) * 32));
127                 err |= __get_user(current_thread_info()->xfsr[0],
128                                   &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
129                 err |= __get_user(current_thread_info()->gsr[0],
130                                   &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
131                 regs->tstate &= ~TSTATE_PEF;
132         }
133         if (err)
134                 goto do_sigsegv;
135
136         return;
137 do_sigsegv:
138         force_sig(SIGSEGV, current);
139 }
140
141 asmlinkage void sparc64_get_context(struct pt_regs *regs)
142 {
143         struct ucontext __user *ucp = (struct ucontext __user *)
144                 regs->u_regs[UREG_I0];
145         mc_gregset_t __user *grp;
146         mcontext_t __user *mcp;
147         unsigned long fp, i7;
148         unsigned char fenab;
149         int err;
150
151         synchronize_user_stack();
152         if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
153                 goto do_sigsegv;
154
155 #if 1
156         fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
157 #else
158         fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
159 #endif
160                 
161         mcp = &ucp->uc_mcontext;
162         grp = &mcp->mc_gregs;
163
164         /* Skip over the trap instruction, first. */
165         if (test_thread_flag(TIF_32BIT)) {
166                 regs->tpc   = (regs->tnpc & 0xffffffff);
167                 regs->tnpc  = (regs->tnpc + 4) & 0xffffffff;
168         } else {
169                 regs->tpc   = regs->tnpc;
170                 regs->tnpc += 4;
171         }
172         err = 0;
173         if (_NSIG_WORDS == 1)
174                 err |= __put_user(current->blocked.sig[0],
175                                   (unsigned long __user *)&ucp->uc_sigmask);
176         else
177                 err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
178                                       sizeof(sigset_t));
179
180         err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
181         err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
182         err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
183         err |= __put_user(regs->y, &((*grp)[MC_Y]));
184         err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
185         err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
186         err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
187         err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
188         err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
189         err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
190         err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
191         err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
192         err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
193         err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
194         err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
195         err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
196         err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
197         err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
198         err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
199
200         err |= __get_user(fp,
201                  (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
202         err |= __get_user(i7,
203                  (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
204         err |= __put_user(fp, &(mcp->mc_fp));
205         err |= __put_user(i7, &(mcp->mc_i7));
206
207         err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
208         if (fenab) {
209                 unsigned long *fpregs = current_thread_info()->fpregs;
210                 unsigned long fprs;
211                 
212                 fprs = current_thread_info()->fpsaved[0];
213                 if (fprs & FPRS_DL)
214                         err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
215                                             (sizeof(unsigned int) * 32));
216                 if (fprs & FPRS_DU)
217                         err |= copy_to_user(
218                           ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
219                           (sizeof(unsigned int) * 32));
220                 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
221                 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
222                 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
223         }
224         if (err)
225                 goto do_sigsegv;
226
227         return;
228 do_sigsegv:
229         force_sig(SIGSEGV, current);
230 }
231
232 struct rt_signal_frame {
233         struct sparc_stackf     ss;
234         siginfo_t               info;
235         struct pt_regs          regs;
236         __siginfo_fpu_t __user  *fpu_save;
237         stack_t                 stack;
238         sigset_t                mask;
239         __siginfo_fpu_t         fpu_state;
240 };
241
242 /* Align macros */
243 #define RT_ALIGNEDSZ  (((sizeof(struct rt_signal_frame) + 7) & (~7)))
244
245 /*
246  * atomically swap in the new signal mask, and wait for a signal.
247  * This is really tricky on the Sparc, watch out...
248  */
249 asmlinkage void _sigpause_common(old_sigset_t set, struct pt_regs *regs)
250 {
251         sigset_t saveset;
252
253 #ifdef CONFIG_SPARC32_COMPAT
254         if (test_thread_flag(TIF_32BIT)) {
255                 extern asmlinkage void _sigpause32_common(compat_old_sigset_t,
256                                                           struct pt_regs *);
257                 _sigpause32_common(set, regs);
258                 return;
259         }
260 #endif
261         set &= _BLOCKABLE;
262         spin_lock_irq(&current->sighand->siglock);
263         saveset = current->blocked;
264         siginitset(&current->blocked, set);
265         recalc_sigpending();
266         spin_unlock_irq(&current->sighand->siglock);
267         
268         if (test_thread_flag(TIF_32BIT)) {
269                 regs->tpc = (regs->tnpc & 0xffffffff);
270                 regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
271         } else {
272                 regs->tpc = regs->tnpc;
273                 regs->tnpc += 4;
274         }
275
276         /* Condition codes and return value where set here for sigpause,
277          * and so got used by setup_frame, which again causes sigreturn()
278          * to return -EINTR.
279          */
280         while (1) {
281                 current->state = TASK_INTERRUPTIBLE;
282                 schedule();
283                 /*
284                  * Return -EINTR and set condition code here,
285                  * so the interrupted system call actually returns
286                  * these.
287                  */
288                 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
289                 regs->u_regs[UREG_I0] = EINTR;
290                 if (do_signal(&saveset, regs, 0, 0))
291                         return;
292         }
293 }
294
295 asmlinkage void do_sigpause(unsigned int set, struct pt_regs *regs)
296 {
297         _sigpause_common(set, regs);
298 }
299
300 asmlinkage void do_sigsuspend(struct pt_regs *regs)
301 {
302         _sigpause_common(regs->u_regs[UREG_I0], regs);
303 }
304
305 asmlinkage void do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize, struct pt_regs *regs)
306 {
307         sigset_t oldset, set;
308         
309         /* XXX: Don't preclude handling different sized sigset_t's.  */
310         if (sigsetsize != sizeof(sigset_t)) {
311                 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
312                 regs->u_regs[UREG_I0] = EINVAL;
313                 return;
314         }
315         if (copy_from_user(&set, uset, sizeof(set))) {
316                 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
317                 regs->u_regs[UREG_I0] = EFAULT;
318                 return;
319         }
320                                                                 
321         sigdelsetmask(&set, ~_BLOCKABLE);
322         spin_lock_irq(&current->sighand->siglock);
323         oldset = current->blocked;
324         current->blocked = set;
325         recalc_sigpending();
326         spin_unlock_irq(&current->sighand->siglock);
327         
328         if (test_thread_flag(TIF_32BIT)) {
329                 regs->tpc = (regs->tnpc & 0xffffffff);
330                 regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
331         } else {
332                 regs->tpc = regs->tnpc;
333                 regs->tnpc += 4;
334         }
335
336         /* Condition codes and return value where set here for sigpause,
337          * and so got used by setup_frame, which again causes sigreturn()
338          * to return -EINTR.
339          */
340         while (1) {
341                 current->state = TASK_INTERRUPTIBLE;
342                 schedule();
343                 /*
344                  * Return -EINTR and set condition code here,
345                  * so the interrupted system call actually returns
346                  * these.
347                  */
348                 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
349                 regs->u_regs[UREG_I0] = EINTR;
350                 if (do_signal(&oldset, regs, 0, 0))
351                         return;
352         }
353 }
354
355 static inline int
356 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
357 {
358         unsigned long *fpregs = current_thread_info()->fpregs;
359         unsigned long fprs;
360         int err;
361
362         err = __get_user(fprs, &fpu->si_fprs);
363         fprs_write(0);
364         regs->tstate &= ~TSTATE_PEF;
365         if (fprs & FPRS_DL)
366                 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
367                                (sizeof(unsigned int) * 32));
368         if (fprs & FPRS_DU)
369                 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
370                                (sizeof(unsigned int) * 32));
371         err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
372         err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
373         current_thread_info()->fpsaved[0] |= fprs;
374         return err;
375 }
376
377 void do_rt_sigreturn(struct pt_regs *regs)
378 {
379         struct rt_signal_frame __user *sf;
380         unsigned long tpc, tnpc, tstate;
381         __siginfo_fpu_t __user *fpu_save;
382         mm_segment_t old_fs;
383         sigset_t set;
384         stack_t st;
385         int err;
386
387         /* Always make any pending restarted system calls return -EINTR */
388         current_thread_info()->restart_block.fn = do_no_restart_syscall;
389
390         synchronize_user_stack ();
391         sf = (struct rt_signal_frame __user *)
392                 (regs->u_regs [UREG_FP] + STACK_BIAS);
393
394         /* 1. Make sure we are not getting garbage from the user */
395         if (((unsigned long) sf) & 3)
396                 goto segv;
397
398         err = get_user(tpc, &sf->regs.tpc);
399         err |= __get_user(tnpc, &sf->regs.tnpc);
400         if (test_thread_flag(TIF_32BIT)) {
401                 tpc &= 0xffffffff;
402                 tnpc &= 0xffffffff;
403         }
404         err |= ((tpc | tnpc) & 3);
405
406         /* 2. Restore the state */
407         err |= __get_user(regs->y, &sf->regs.y);
408         err |= __get_user(tstate, &sf->regs.tstate);
409         err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
410
411         /* User can only change condition codes and %asi in %tstate. */
412         regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
413         regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
414
415         err |= __get_user(fpu_save, &sf->fpu_save);
416         if (fpu_save)
417                 err |= restore_fpu_state(regs, &sf->fpu_state);
418
419         err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
420         err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
421         
422         if (err)
423                 goto segv;
424                 
425         regs->tpc = tpc;
426         regs->tnpc = tnpc;
427         
428         /* It is more difficult to avoid calling this function than to
429            call it and ignore errors.  */
430         old_fs = get_fs();
431         set_fs(KERNEL_DS);
432         do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf);
433         set_fs(old_fs);
434
435         sigdelsetmask(&set, ~_BLOCKABLE);
436         spin_lock_irq(&current->sighand->siglock);
437         current->blocked = set;
438         recalc_sigpending();
439         spin_unlock_irq(&current->sighand->siglock);
440         return;
441 segv:
442         force_sig(SIGSEGV, current);
443 }
444
445 /* Checks if the fp is valid */
446 static int invalid_frame_pointer(void __user *fp, int fplen)
447 {
448         if (((unsigned long) fp) & 7)
449                 return 1;
450         return 0;
451 }
452
453 static inline int
454 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
455 {
456         unsigned long *fpregs = (unsigned long *)(regs+1);
457         unsigned long fprs;
458         int err = 0;
459         
460         fprs = current_thread_info()->fpsaved[0];
461         if (fprs & FPRS_DL)
462                 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
463                                     (sizeof(unsigned int) * 32));
464         if (fprs & FPRS_DU)
465                 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
466                                     (sizeof(unsigned int) * 32));
467         err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
468         err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
469         err |= __put_user(fprs, &fpu->si_fprs);
470
471         return err;
472 }
473
474 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
475 {
476         unsigned long sp;
477
478         sp = regs->u_regs[UREG_FP] + STACK_BIAS;
479
480         /* This is the X/Open sanctioned signal stack switching.  */
481         if (ka->sa.sa_flags & SA_ONSTACK) {
482                 if (!on_sig_stack(sp) &&
483                     !((current->sas_ss_sp + current->sas_ss_size) & 7))
484                         sp = current->sas_ss_sp + current->sas_ss_size;
485         }
486         return (void __user *)(sp - framesize);
487 }
488
489 static inline void
490 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
491                int signo, sigset_t *oldset, siginfo_t *info)
492 {
493         struct rt_signal_frame __user *sf;
494         int sigframe_size, err;
495
496         /* 1. Make sure everything is clean */
497         synchronize_user_stack();
498         save_and_clear_fpu();
499         
500         sigframe_size = RT_ALIGNEDSZ;
501         if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
502                 sigframe_size -= sizeof(__siginfo_fpu_t);
503
504         sf = (struct rt_signal_frame __user *)
505                 get_sigframe(ka, regs, sigframe_size);
506         
507         if (invalid_frame_pointer (sf, sigframe_size))
508                 goto sigill;
509
510         if (get_thread_wsaved() != 0)
511                 goto sigill;
512
513         /* 2. Save the current process state */
514         err = copy_to_user(&sf->regs, regs, sizeof (*regs));
515
516         if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
517                 err |= save_fpu_state(regs, &sf->fpu_state);
518                 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
519         } else {
520                 err |= __put_user(0, &sf->fpu_save);
521         }
522         
523         /* Setup sigaltstack */
524         err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
525         err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
526         err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
527
528         err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
529
530         err |= copy_in_user((u64 __user *)sf,
531                             (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
532                             sizeof(struct reg_window));
533
534         if (info)
535                 err |= copy_siginfo_to_user(&sf->info, info);
536         else {
537                 err |= __put_user(signo, &sf->info.si_signo);
538                 err |= __put_user(SI_NOINFO, &sf->info.si_code);
539         }
540         if (err)
541                 goto sigsegv;
542         
543         /* 3. signal handler back-trampoline and parameters */
544         regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
545         regs->u_regs[UREG_I0] = signo;
546         regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
547
548         /* The sigcontext is passed in this way because of how it
549          * is defined in GLIBC's /usr/include/bits/sigcontext.h
550          * for sparc64.  It includes the 128 bytes of siginfo_t.
551          */
552         regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
553
554         /* 5. signal handler */
555         regs->tpc = (unsigned long) ka->sa.sa_handler;
556         regs->tnpc = (regs->tpc + 4);
557         if (test_thread_flag(TIF_32BIT)) {
558                 regs->tpc &= 0xffffffff;
559                 regs->tnpc &= 0xffffffff;
560         }
561         /* 4. return to kernel instructions */
562         regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
563         return;
564
565 sigill:
566         do_exit(SIGILL);
567 sigsegv:
568         force_sigsegv(signo, current);
569 }
570
571 static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
572                                  siginfo_t *info,
573                                  sigset_t *oldset, struct pt_regs *regs)
574 {
575         setup_rt_frame(ka, regs, signr, oldset,
576                        (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
577         if (!(ka->sa.sa_flags & SA_NOMASK)) {
578                 spin_lock_irq(&current->sighand->siglock);
579                 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
580                 sigaddset(&current->blocked,signr);
581                 recalc_sigpending();
582                 spin_unlock_irq(&current->sighand->siglock);
583         }
584 }
585
586 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
587                                      struct sigaction *sa)
588 {
589         switch (regs->u_regs[UREG_I0]) {
590         case ERESTART_RESTARTBLOCK:
591         case ERESTARTNOHAND:
592         no_system_call_restart:
593                 regs->u_regs[UREG_I0] = EINTR;
594                 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
595                 break;
596         case ERESTARTSYS:
597                 if (!(sa->sa_flags & SA_RESTART))
598                         goto no_system_call_restart;
599                 /* fallthrough */
600         case ERESTARTNOINTR:
601                 regs->u_regs[UREG_I0] = orig_i0;
602                 regs->tpc -= 4;
603                 regs->tnpc -= 4;
604         }
605 }
606
607 /* Note that 'init' is a special process: it doesn't get signals it doesn't
608  * want to handle. Thus you cannot kill init even with a SIGKILL even by
609  * mistake.
610  */
611 static int do_signal(sigset_t *oldset, struct pt_regs * regs,
612                      unsigned long orig_i0, int restart_syscall)
613 {
614         siginfo_t info;
615         struct signal_deliver_cookie cookie;
616         struct k_sigaction ka;
617         int signr;
618         
619         cookie.restart_syscall = restart_syscall;
620         cookie.orig_i0 = orig_i0;
621
622         if (!oldset)
623                 oldset = &current->blocked;
624
625 #ifdef CONFIG_SPARC32_COMPAT
626         if (test_thread_flag(TIF_32BIT)) {
627                 extern int do_signal32(sigset_t *, struct pt_regs *,
628                                        unsigned long, int);
629                 return do_signal32(oldset, regs, orig_i0,
630                                    cookie.restart_syscall);
631         }
632 #endif  
633
634         signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
635         if (signr > 0) {
636                 if (cookie.restart_syscall)
637                         syscall_restart(orig_i0, regs, &ka.sa);
638                 handle_signal(signr, &ka, &info, oldset, regs);
639                 return 1;
640         }
641         if (cookie.restart_syscall &&
642             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
643              regs->u_regs[UREG_I0] == ERESTARTSYS ||
644              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
645                 /* replay the system call when we are done */
646                 regs->u_regs[UREG_I0] = cookie.orig_i0;
647                 regs->tpc -= 4;
648                 regs->tnpc -= 4;
649         }
650         if (cookie.restart_syscall &&
651             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
652                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
653                 regs->tpc -= 4;
654                 regs->tnpc -= 4;
655         }
656         return 0;
657 }
658
659 void do_notify_resume(sigset_t *oldset, struct pt_regs *regs,
660                       unsigned long orig_i0, int restart_syscall,
661                       unsigned long thread_info_flags)
662 {
663         if (thread_info_flags & _TIF_SIGPENDING)
664                 do_signal(oldset, regs, orig_i0, restart_syscall);
665 }
666
667 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
668 {
669         struct signal_deliver_cookie *cp = cookie;
670
671         if (cp->restart_syscall &&
672             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
673              regs->u_regs[UREG_I0] == ERESTARTSYS ||
674              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
675                 /* replay the system call when we are done */
676                 regs->u_regs[UREG_I0] = cp->orig_i0;
677                 regs->tpc -= 4;
678                 regs->tnpc -= 4;
679                 cp->restart_syscall = 0;
680         }
681         if (cp->restart_syscall &&
682             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
683                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
684                 regs->tpc -= 4;
685                 regs->tnpc -= 4;
686                 cp->restart_syscall = 0;
687         }
688 }