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1/*
2 * arch/sparc64/kernel/signal.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
6 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
7 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
8 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
9 */
10
11#ifdef CONFIG_COMPAT
12#include <linux/compat.h> /* for compat_old_sigset_t */
13#endif
14#include <linux/sched.h>
15#include <linux/kernel.h>
16#include <linux/signal.h>
17#include <linux/errno.h>
18#include <linux/wait.h>
19#include <linux/ptrace.h>
20#include <linux/tracehook.h>
21#include <linux/unistd.h>
22#include <linux/mm.h>
23#include <linux/tty.h>
24#include <linux/binfmts.h>
25#include <linux/bitops.h>
26
27#include <asm/uaccess.h>
28#include <asm/ptrace.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#include <asm/switch_to.h>
35#include <asm/cacheflush.h>
36
37#include "entry.h"
38#include "systbls.h"
39#include "sigutil.h"
40
41/* {set, get}context() needed for 64-bit SparcLinux userland. */
42asmlinkage void sparc64_set_context(struct pt_regs *regs)
43{
44 struct ucontext __user *ucp = (struct ucontext __user *)
45 regs->u_regs[UREG_I0];
46 mc_gregset_t __user *grp;
47 unsigned long pc, npc, tstate;
48 unsigned long fp, i7;
49 unsigned char fenab;
50 int err;
51
52 flush_user_windows();
53 if (get_thread_wsaved() ||
54 (((unsigned long)ucp) & (sizeof(unsigned long)-1)) ||
55 (!__access_ok(ucp, sizeof(*ucp))))
56 goto do_sigsegv;
57 grp = &ucp->uc_mcontext.mc_gregs;
58 err = __get_user(pc, &((*grp)[MC_PC]));
59 err |= __get_user(npc, &((*grp)[MC_NPC]));
60 if (err || ((pc | npc) & 3))
61 goto do_sigsegv;
62 if (regs->u_regs[UREG_I1]) {
63 sigset_t set;
64
65 if (_NSIG_WORDS == 1) {
66 if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
67 goto do_sigsegv;
68 } else {
69 if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
70 goto do_sigsegv;
71 }
72 set_current_blocked(&set);
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
91 /* Skip %g7 as that's the thread register in userspace. */
92
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;
134do_sigsegv:
135 force_sig(SIGSEGV, current);
136}
137
138asmlinkage 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, ¤t->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;
225do_sigsegv:
226 force_sig(SIGSEGV, current);
227}
228
229struct 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_rwin_t *rwin_save;
237};
238
239static long _sigpause_common(old_sigset_t set)
240{
241 sigset_t blocked;
242 siginitset(&blocked, set);
243 return sigsuspend(&blocked);
244}
245
246asmlinkage long sys_sigpause(unsigned int set)
247{
248 return _sigpause_common(set);
249}
250
251asmlinkage long sys_sigsuspend(old_sigset_t set)
252{
253 return _sigpause_common(set);
254}
255
256void do_rt_sigreturn(struct pt_regs *regs)
257{
258 struct rt_signal_frame __user *sf;
259 unsigned long tpc, tnpc, tstate;
260 __siginfo_fpu_t __user *fpu_save;
261 __siginfo_rwin_t __user *rwin_save;
262 sigset_t set;
263 int err;
264
265 /* Always make any pending restarted system calls return -EINTR */
266 current_thread_info()->restart_block.fn = do_no_restart_syscall;
267
268 synchronize_user_stack ();
269 sf = (struct rt_signal_frame __user *)
270 (regs->u_regs [UREG_FP] + STACK_BIAS);
271
272 /* 1. Make sure we are not getting garbage from the user */
273 if (((unsigned long) sf) & 3)
274 goto segv;
275
276 err = get_user(tpc, &sf->regs.tpc);
277 err |= __get_user(tnpc, &sf->regs.tnpc);
278 if (test_thread_flag(TIF_32BIT)) {
279 tpc &= 0xffffffff;
280 tnpc &= 0xffffffff;
281 }
282 err |= ((tpc | tnpc) & 3);
283
284 /* 2. Restore the state */
285 err |= __get_user(regs->y, &sf->regs.y);
286 err |= __get_user(tstate, &sf->regs.tstate);
287 err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
288
289 /* User can only change condition codes and %asi in %tstate. */
290 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
291 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
292
293 err |= __get_user(fpu_save, &sf->fpu_save);
294 if (!err && fpu_save)
295 err |= restore_fpu_state(regs, fpu_save);
296
297 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
298 err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
299
300 if (err)
301 goto segv;
302
303 err |= __get_user(rwin_save, &sf->rwin_save);
304 if (!err && rwin_save) {
305 if (restore_rwin_state(rwin_save))
306 goto segv;
307 }
308
309 regs->tpc = tpc;
310 regs->tnpc = tnpc;
311
312 /* Prevent syscall restart. */
313 pt_regs_clear_syscall(regs);
314
315 set_current_blocked(&set);
316 return;
317segv:
318 force_sig(SIGSEGV, current);
319}
320
321/* Checks if the fp is valid */
322static int invalid_frame_pointer(void __user *fp)
323{
324 if (((unsigned long) fp) & 15)
325 return 1;
326 return 0;
327}
328
329static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
330{
331 unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
332
333 /*
334 * If we are on the alternate signal stack and would overflow it, don't.
335 * Return an always-bogus address instead so we will die with SIGSEGV.
336 */
337 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
338 return (void __user *) -1L;
339
340 /* This is the X/Open sanctioned signal stack switching. */
341 if (ka->sa.sa_flags & SA_ONSTACK) {
342 if (sas_ss_flags(sp) == 0)
343 sp = current->sas_ss_sp + current->sas_ss_size;
344 }
345
346 sp -= framesize;
347
348 /* Always align the stack frame. This handles two cases. First,
349 * sigaltstack need not be mindful of platform specific stack
350 * alignment. Second, if we took this signal because the stack
351 * is not aligned properly, we'd like to take the signal cleanly
352 * and report that.
353 */
354 sp &= ~15UL;
355
356 return (void __user *) sp;
357}
358
359static inline int
360setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
361 int signo, sigset_t *oldset, siginfo_t *info)
362{
363 struct rt_signal_frame __user *sf;
364 int wsaved, err, sf_size;
365 void __user *tail;
366
367 /* 1. Make sure everything is clean */
368 synchronize_user_stack();
369 save_and_clear_fpu();
370
371 wsaved = get_thread_wsaved();
372
373 sf_size = sizeof(struct rt_signal_frame);
374 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
375 sf_size += sizeof(__siginfo_fpu_t);
376 if (wsaved)
377 sf_size += sizeof(__siginfo_rwin_t);
378 sf = (struct rt_signal_frame __user *)
379 get_sigframe(ka, regs, sf_size);
380
381 if (invalid_frame_pointer (sf))
382 goto sigill;
383
384 tail = (sf + 1);
385
386 /* 2. Save the current process state */
387 err = copy_to_user(&sf->regs, regs, sizeof (*regs));
388
389 if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
390 __siginfo_fpu_t __user *fpu_save = tail;
391 tail += sizeof(__siginfo_fpu_t);
392 err |= save_fpu_state(regs, fpu_save);
393 err |= __put_user((u64)fpu_save, &sf->fpu_save);
394 } else {
395 err |= __put_user(0, &sf->fpu_save);
396 }
397 if (wsaved) {
398 __siginfo_rwin_t __user *rwin_save = tail;
399 tail += sizeof(__siginfo_rwin_t);
400 err |= save_rwin_state(wsaved, rwin_save);
401 err |= __put_user((u64)rwin_save, &sf->rwin_save);
402 set_thread_wsaved(0);
403 } else {
404 err |= __put_user(0, &sf->rwin_save);
405 }
406
407 /* Setup sigaltstack */
408 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
409 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
410 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
411
412 err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
413
414 if (!wsaved) {
415 err |= copy_in_user((u64 __user *)sf,
416 (u64 __user *)(regs->u_regs[UREG_FP] +
417 STACK_BIAS),
418 sizeof(struct reg_window));
419 } else {
420 struct reg_window *rp;
421
422 rp = ¤t_thread_info()->reg_window[wsaved - 1];
423 err |= copy_to_user(sf, rp, sizeof(struct reg_window));
424 }
425 if (info)
426 err |= copy_siginfo_to_user(&sf->info, info);
427 else {
428 err |= __put_user(signo, &sf->info.si_signo);
429 err |= __put_user(SI_NOINFO, &sf->info.si_code);
430 }
431 if (err)
432 goto sigsegv;
433
434 /* 3. signal handler back-trampoline and parameters */
435 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
436 regs->u_regs[UREG_I0] = signo;
437 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
438
439 /* The sigcontext is passed in this way because of how it
440 * is defined in GLIBC's /usr/include/bits/sigcontext.h
441 * for sparc64. It includes the 128 bytes of siginfo_t.
442 */
443 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
444
445 /* 5. signal handler */
446 regs->tpc = (unsigned long) ka->sa.sa_handler;
447 regs->tnpc = (regs->tpc + 4);
448 if (test_thread_flag(TIF_32BIT)) {
449 regs->tpc &= 0xffffffff;
450 regs->tnpc &= 0xffffffff;
451 }
452 /* 4. return to kernel instructions */
453 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
454 return 0;
455
456sigill:
457 do_exit(SIGILL);
458 return -EINVAL;
459
460sigsegv:
461 force_sigsegv(signo, current);
462 return -EFAULT;
463}
464
465static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
466 siginfo_t *info,
467 sigset_t *oldset, struct pt_regs *regs)
468{
469 int err;
470
471 err = setup_rt_frame(ka, regs, signr, oldset,
472 (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
473 if (err)
474 return;
475
476 signal_delivered(signr, info, ka, regs, 0);
477}
478
479static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
480 struct sigaction *sa)
481{
482 switch (regs->u_regs[UREG_I0]) {
483 case ERESTART_RESTARTBLOCK:
484 case ERESTARTNOHAND:
485 no_system_call_restart:
486 regs->u_regs[UREG_I0] = EINTR;
487 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
488 break;
489 case ERESTARTSYS:
490 if (!(sa->sa_flags & SA_RESTART))
491 goto no_system_call_restart;
492 /* fallthrough */
493 case ERESTARTNOINTR:
494 regs->u_regs[UREG_I0] = orig_i0;
495 regs->tpc -= 4;
496 regs->tnpc -= 4;
497 }
498}
499
500/* Note that 'init' is a special process: it doesn't get signals it doesn't
501 * want to handle. Thus you cannot kill init even with a SIGKILL even by
502 * mistake.
503 */
504static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
505{
506 struct k_sigaction ka;
507 int restart_syscall;
508 sigset_t *oldset = sigmask_to_save();
509 siginfo_t info;
510 int signr;
511
512 /* It's a lot of work and synchronization to add a new ptrace
513 * register for GDB to save and restore in order to get
514 * orig_i0 correct for syscall restarts when debugging.
515 *
516 * Although it should be the case that most of the global
517 * registers are volatile across a system call, glibc already
518 * depends upon that fact that we preserve them. So we can't
519 * just use any global register to save away the orig_i0 value.
520 *
521 * In particular %g2, %g3, %g4, and %g5 are all assumed to be
522 * preserved across a system call trap by various pieces of
523 * code in glibc.
524 *
525 * %g7 is used as the "thread register". %g6 is not used in
526 * any fixed manner. %g6 is used as a scratch register and
527 * a compiler temporary, but it's value is never used across
528 * a system call. Therefore %g6 is usable for orig_i0 storage.
529 */
530 if (pt_regs_is_syscall(regs) &&
531 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
532 regs->u_regs[UREG_G6] = orig_i0;
533
534#ifdef CONFIG_COMPAT
535 if (test_thread_flag(TIF_32BIT)) {
536 extern void do_signal32(sigset_t *, struct pt_regs *);
537 do_signal32(oldset, regs);
538 return;
539 }
540#endif
541
542 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
543
544 restart_syscall = 0;
545 if (pt_regs_is_syscall(regs) &&
546 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
547 restart_syscall = 1;
548 orig_i0 = regs->u_regs[UREG_G6];
549 }
550
551 if (signr > 0) {
552 if (restart_syscall)
553 syscall_restart(orig_i0, regs, &ka.sa);
554 handle_signal(signr, &ka, &info, oldset, regs);
555 return;
556 }
557 if (restart_syscall &&
558 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
559 regs->u_regs[UREG_I0] == ERESTARTSYS ||
560 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
561 /* replay the system call when we are done */
562 regs->u_regs[UREG_I0] = orig_i0;
563 regs->tpc -= 4;
564 regs->tnpc -= 4;
565 pt_regs_clear_syscall(regs);
566 }
567 if (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 pt_regs_clear_syscall(regs);
573 }
574
575 /* If there's no signal to deliver, we just put the saved sigmask
576 * back
577 */
578 restore_saved_sigmask();
579}
580
581void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
582{
583 if (thread_info_flags & _TIF_SIGPENDING)
584 do_signal(regs, orig_i0);
585 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
586 clear_thread_flag(TIF_NOTIFY_RESUME);
587 tracehook_notify_resume(regs);
588 }
589}
590
1/*
2 * arch/sparc64/kernel/signal.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
6 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
7 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
8 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
9 */
10
11#ifdef CONFIG_COMPAT
12#include <linux/compat.h> /* for compat_old_sigset_t */
13#endif
14#include <linux/sched.h>
15#include <linux/kernel.h>
16#include <linux/signal.h>
17#include <linux/errno.h>
18#include <linux/wait.h>
19#include <linux/ptrace.h>
20#include <linux/tracehook.h>
21#include <linux/unistd.h>
22#include <linux/mm.h>
23#include <linux/tty.h>
24#include <linux/binfmts.h>
25#include <linux/bitops.h>
26
27#include <asm/uaccess.h>
28#include <asm/ptrace.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#include "entry.h"
36#include "systbls.h"
37#include "sigutil.h"
38
39#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
40
41/* {set, get}context() needed for 64-bit SparcLinux userland. */
42asmlinkage void sparc64_set_context(struct pt_regs *regs)
43{
44 struct ucontext __user *ucp = (struct ucontext __user *)
45 regs->u_regs[UREG_I0];
46 mc_gregset_t __user *grp;
47 unsigned long pc, npc, tstate;
48 unsigned long fp, i7;
49 unsigned char fenab;
50 int err;
51
52 flush_user_windows();
53 if (get_thread_wsaved() ||
54 (((unsigned long)ucp) & (sizeof(unsigned long)-1)) ||
55 (!__access_ok(ucp, sizeof(*ucp))))
56 goto do_sigsegv;
57 grp = &ucp->uc_mcontext.mc_gregs;
58 err = __get_user(pc, &((*grp)[MC_PC]));
59 err |= __get_user(npc, &((*grp)[MC_NPC]));
60 if (err || ((pc | npc) & 3))
61 goto do_sigsegv;
62 if (regs->u_regs[UREG_I1]) {
63 sigset_t set;
64
65 if (_NSIG_WORDS == 1) {
66 if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
67 goto do_sigsegv;
68 } else {
69 if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
70 goto do_sigsegv;
71 }
72 sigdelsetmask(&set, ~_BLOCKABLE);
73 set_current_blocked(&set);
74 }
75 if (test_thread_flag(TIF_32BIT)) {
76 pc &= 0xffffffff;
77 npc &= 0xffffffff;
78 }
79 regs->tpc = pc;
80 regs->tnpc = npc;
81 err |= __get_user(regs->y, &((*grp)[MC_Y]));
82 err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
83 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
84 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
85 err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
86 err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
87 err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
88 err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
89 err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
90 err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
91
92 /* Skip %g7 as that's the thread register in userspace. */
93
94 err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
95 err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
96 err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
97 err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
98 err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
99 err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
100 err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
101 err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
102
103 err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
104 err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
105 err |= __put_user(fp,
106 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
107 err |= __put_user(i7,
108 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
109
110 err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
111 if (fenab) {
112 unsigned long *fpregs = current_thread_info()->fpregs;
113 unsigned long fprs;
114
115 fprs_write(0);
116 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
117 if (fprs & FPRS_DL)
118 err |= copy_from_user(fpregs,
119 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
120 (sizeof(unsigned int) * 32));
121 if (fprs & FPRS_DU)
122 err |= copy_from_user(fpregs+16,
123 ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
124 (sizeof(unsigned int) * 32));
125 err |= __get_user(current_thread_info()->xfsr[0],
126 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
127 err |= __get_user(current_thread_info()->gsr[0],
128 &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
129 regs->tstate &= ~TSTATE_PEF;
130 }
131 if (err)
132 goto do_sigsegv;
133
134 return;
135do_sigsegv:
136 force_sig(SIGSEGV, current);
137}
138
139asmlinkage void sparc64_get_context(struct pt_regs *regs)
140{
141 struct ucontext __user *ucp = (struct ucontext __user *)
142 regs->u_regs[UREG_I0];
143 mc_gregset_t __user *grp;
144 mcontext_t __user *mcp;
145 unsigned long fp, i7;
146 unsigned char fenab;
147 int err;
148
149 synchronize_user_stack();
150 if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
151 goto do_sigsegv;
152
153#if 1
154 fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
155#else
156 fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
157#endif
158
159 mcp = &ucp->uc_mcontext;
160 grp = &mcp->mc_gregs;
161
162 /* Skip over the trap instruction, first. */
163 if (test_thread_flag(TIF_32BIT)) {
164 regs->tpc = (regs->tnpc & 0xffffffff);
165 regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
166 } else {
167 regs->tpc = regs->tnpc;
168 regs->tnpc += 4;
169 }
170 err = 0;
171 if (_NSIG_WORDS == 1)
172 err |= __put_user(current->blocked.sig[0],
173 (unsigned long __user *)&ucp->uc_sigmask);
174 else
175 err |= __copy_to_user(&ucp->uc_sigmask, ¤t->blocked,
176 sizeof(sigset_t));
177
178 err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
179 err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
180 err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
181 err |= __put_user(regs->y, &((*grp)[MC_Y]));
182 err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
183 err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
184 err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
185 err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
186 err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
187 err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
188 err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
189 err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
190 err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
191 err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
192 err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
193 err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
194 err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
195 err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
196 err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
197
198 err |= __get_user(fp,
199 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
200 err |= __get_user(i7,
201 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
202 err |= __put_user(fp, &(mcp->mc_fp));
203 err |= __put_user(i7, &(mcp->mc_i7));
204
205 err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
206 if (fenab) {
207 unsigned long *fpregs = current_thread_info()->fpregs;
208 unsigned long fprs;
209
210 fprs = current_thread_info()->fpsaved[0];
211 if (fprs & FPRS_DL)
212 err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
213 (sizeof(unsigned int) * 32));
214 if (fprs & FPRS_DU)
215 err |= copy_to_user(
216 ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
217 (sizeof(unsigned int) * 32));
218 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
219 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
220 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
221 }
222 if (err)
223 goto do_sigsegv;
224
225 return;
226do_sigsegv:
227 force_sig(SIGSEGV, current);
228}
229
230struct rt_signal_frame {
231 struct sparc_stackf ss;
232 siginfo_t info;
233 struct pt_regs regs;
234 __siginfo_fpu_t __user *fpu_save;
235 stack_t stack;
236 sigset_t mask;
237 __siginfo_rwin_t *rwin_save;
238};
239
240static long _sigpause_common(old_sigset_t set)
241{
242 sigset_t blocked;
243
244 current->saved_sigmask = current->blocked;
245
246 set &= _BLOCKABLE;
247 siginitset(&blocked, set);
248 set_current_blocked(&blocked);
249
250 current->state = TASK_INTERRUPTIBLE;
251 schedule();
252
253 set_restore_sigmask();
254
255 return -ERESTARTNOHAND;
256}
257
258asmlinkage long sys_sigpause(unsigned int set)
259{
260 return _sigpause_common(set);
261}
262
263asmlinkage long sys_sigsuspend(old_sigset_t set)
264{
265 return _sigpause_common(set);
266}
267
268void do_rt_sigreturn(struct pt_regs *regs)
269{
270 struct rt_signal_frame __user *sf;
271 unsigned long tpc, tnpc, tstate;
272 __siginfo_fpu_t __user *fpu_save;
273 __siginfo_rwin_t __user *rwin_save;
274 sigset_t set;
275 int err;
276
277 /* Always make any pending restarted system calls return -EINTR */
278 current_thread_info()->restart_block.fn = do_no_restart_syscall;
279
280 synchronize_user_stack ();
281 sf = (struct rt_signal_frame __user *)
282 (regs->u_regs [UREG_FP] + STACK_BIAS);
283
284 /* 1. Make sure we are not getting garbage from the user */
285 if (((unsigned long) sf) & 3)
286 goto segv;
287
288 err = get_user(tpc, &sf->regs.tpc);
289 err |= __get_user(tnpc, &sf->regs.tnpc);
290 if (test_thread_flag(TIF_32BIT)) {
291 tpc &= 0xffffffff;
292 tnpc &= 0xffffffff;
293 }
294 err |= ((tpc | tnpc) & 3);
295
296 /* 2. Restore the state */
297 err |= __get_user(regs->y, &sf->regs.y);
298 err |= __get_user(tstate, &sf->regs.tstate);
299 err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
300
301 /* User can only change condition codes and %asi in %tstate. */
302 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
303 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
304
305 err |= __get_user(fpu_save, &sf->fpu_save);
306 if (!err && fpu_save)
307 err |= restore_fpu_state(regs, fpu_save);
308
309 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
310 err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
311
312 if (err)
313 goto segv;
314
315 err |= __get_user(rwin_save, &sf->rwin_save);
316 if (!err && rwin_save) {
317 if (restore_rwin_state(rwin_save))
318 goto segv;
319 }
320
321 regs->tpc = tpc;
322 regs->tnpc = tnpc;
323
324 /* Prevent syscall restart. */
325 pt_regs_clear_syscall(regs);
326
327 sigdelsetmask(&set, ~_BLOCKABLE);
328 set_current_blocked(&set);
329 return;
330segv:
331 force_sig(SIGSEGV, current);
332}
333
334/* Checks if the fp is valid */
335static int invalid_frame_pointer(void __user *fp)
336{
337 if (((unsigned long) fp) & 15)
338 return 1;
339 return 0;
340}
341
342static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
343{
344 unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
345
346 /*
347 * If we are on the alternate signal stack and would overflow it, don't.
348 * Return an always-bogus address instead so we will die with SIGSEGV.
349 */
350 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
351 return (void __user *) -1L;
352
353 /* This is the X/Open sanctioned signal stack switching. */
354 if (ka->sa.sa_flags & SA_ONSTACK) {
355 if (sas_ss_flags(sp) == 0)
356 sp = current->sas_ss_sp + current->sas_ss_size;
357 }
358
359 sp -= framesize;
360
361 /* Always align the stack frame. This handles two cases. First,
362 * sigaltstack need not be mindful of platform specific stack
363 * alignment. Second, if we took this signal because the stack
364 * is not aligned properly, we'd like to take the signal cleanly
365 * and report that.
366 */
367 sp &= ~15UL;
368
369 return (void __user *) sp;
370}
371
372static inline int
373setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
374 int signo, sigset_t *oldset, siginfo_t *info)
375{
376 struct rt_signal_frame __user *sf;
377 int wsaved, err, sf_size;
378 void __user *tail;
379
380 /* 1. Make sure everything is clean */
381 synchronize_user_stack();
382 save_and_clear_fpu();
383
384 wsaved = get_thread_wsaved();
385
386 sf_size = sizeof(struct rt_signal_frame);
387 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
388 sf_size += sizeof(__siginfo_fpu_t);
389 if (wsaved)
390 sf_size += sizeof(__siginfo_rwin_t);
391 sf = (struct rt_signal_frame __user *)
392 get_sigframe(ka, regs, sf_size);
393
394 if (invalid_frame_pointer (sf))
395 goto sigill;
396
397 tail = (sf + 1);
398
399 /* 2. Save the current process state */
400 err = copy_to_user(&sf->regs, regs, sizeof (*regs));
401
402 if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
403 __siginfo_fpu_t __user *fpu_save = tail;
404 tail += sizeof(__siginfo_fpu_t);
405 err |= save_fpu_state(regs, fpu_save);
406 err |= __put_user((u64)fpu_save, &sf->fpu_save);
407 } else {
408 err |= __put_user(0, &sf->fpu_save);
409 }
410 if (wsaved) {
411 __siginfo_rwin_t __user *rwin_save = tail;
412 tail += sizeof(__siginfo_rwin_t);
413 err |= save_rwin_state(wsaved, rwin_save);
414 err |= __put_user((u64)rwin_save, &sf->rwin_save);
415 set_thread_wsaved(0);
416 } else {
417 err |= __put_user(0, &sf->rwin_save);
418 }
419
420 /* Setup sigaltstack */
421 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
422 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
423 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
424
425 err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
426
427 if (!wsaved) {
428 err |= copy_in_user((u64 __user *)sf,
429 (u64 __user *)(regs->u_regs[UREG_FP] +
430 STACK_BIAS),
431 sizeof(struct reg_window));
432 } else {
433 struct reg_window *rp;
434
435 rp = ¤t_thread_info()->reg_window[wsaved - 1];
436 err |= copy_to_user(sf, rp, sizeof(struct reg_window));
437 }
438 if (info)
439 err |= copy_siginfo_to_user(&sf->info, info);
440 else {
441 err |= __put_user(signo, &sf->info.si_signo);
442 err |= __put_user(SI_NOINFO, &sf->info.si_code);
443 }
444 if (err)
445 goto sigsegv;
446
447 /* 3. signal handler back-trampoline and parameters */
448 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
449 regs->u_regs[UREG_I0] = signo;
450 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
451
452 /* The sigcontext is passed in this way because of how it
453 * is defined in GLIBC's /usr/include/bits/sigcontext.h
454 * for sparc64. It includes the 128 bytes of siginfo_t.
455 */
456 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
457
458 /* 5. signal handler */
459 regs->tpc = (unsigned long) ka->sa.sa_handler;
460 regs->tnpc = (regs->tpc + 4);
461 if (test_thread_flag(TIF_32BIT)) {
462 regs->tpc &= 0xffffffff;
463 regs->tnpc &= 0xffffffff;
464 }
465 /* 4. return to kernel instructions */
466 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
467 return 0;
468
469sigill:
470 do_exit(SIGILL);
471 return -EINVAL;
472
473sigsegv:
474 force_sigsegv(signo, current);
475 return -EFAULT;
476}
477
478static inline int handle_signal(unsigned long signr, struct k_sigaction *ka,
479 siginfo_t *info,
480 sigset_t *oldset, struct pt_regs *regs)
481{
482 sigset_t blocked;
483 int err;
484
485 err = setup_rt_frame(ka, regs, signr, oldset,
486 (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
487 if (err)
488 return err;
489 sigorsets(&blocked, ¤t->blocked, &ka->sa.sa_mask);
490 if (!(ka->sa.sa_flags & SA_NOMASK))
491 sigaddset(&blocked, signr);
492 set_current_blocked(&blocked);
493
494 tracehook_signal_handler(signr, info, ka, regs, 0);
495
496 return 0;
497}
498
499static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
500 struct sigaction *sa)
501{
502 switch (regs->u_regs[UREG_I0]) {
503 case ERESTART_RESTARTBLOCK:
504 case ERESTARTNOHAND:
505 no_system_call_restart:
506 regs->u_regs[UREG_I0] = EINTR;
507 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
508 break;
509 case ERESTARTSYS:
510 if (!(sa->sa_flags & SA_RESTART))
511 goto no_system_call_restart;
512 /* fallthrough */
513 case ERESTARTNOINTR:
514 regs->u_regs[UREG_I0] = orig_i0;
515 regs->tpc -= 4;
516 regs->tnpc -= 4;
517 }
518}
519
520/* Note that 'init' is a special process: it doesn't get signals it doesn't
521 * want to handle. Thus you cannot kill init even with a SIGKILL even by
522 * mistake.
523 */
524static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
525{
526 struct k_sigaction ka;
527 int restart_syscall;
528 sigset_t *oldset;
529 siginfo_t info;
530 int signr;
531
532 if (pt_regs_is_syscall(regs) &&
533 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
534 restart_syscall = 1;
535 } else
536 restart_syscall = 0;
537
538 if (current_thread_info()->status & TS_RESTORE_SIGMASK)
539 oldset = ¤t->saved_sigmask;
540 else
541 oldset = ¤t->blocked;
542
543#ifdef CONFIG_COMPAT
544 if (test_thread_flag(TIF_32BIT)) {
545 extern void do_signal32(sigset_t *, struct pt_regs *,
546 int restart_syscall,
547 unsigned long orig_i0);
548 do_signal32(oldset, regs, restart_syscall, orig_i0);
549 return;
550 }
551#endif
552
553 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
554
555 /* If the debugger messes with the program counter, it clears
556 * the software "in syscall" bit, directing us to not perform
557 * a syscall restart.
558 */
559 if (restart_syscall && !pt_regs_is_syscall(regs))
560 restart_syscall = 0;
561
562 if (signr > 0) {
563 if (restart_syscall)
564 syscall_restart(orig_i0, regs, &ka.sa);
565 if (handle_signal(signr, &ka, &info, oldset, regs) == 0) {
566 /* A signal was successfully delivered; the saved
567 * sigmask will have been stored in the signal frame,
568 * and will be restored by sigreturn, so we can simply
569 * clear the TS_RESTORE_SIGMASK flag.
570 */
571 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
572 }
573 return;
574 }
575 if (restart_syscall &&
576 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
577 regs->u_regs[UREG_I0] == ERESTARTSYS ||
578 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
579 /* replay the system call when we are done */
580 regs->u_regs[UREG_I0] = orig_i0;
581 regs->tpc -= 4;
582 regs->tnpc -= 4;
583 pt_regs_clear_syscall(regs);
584 }
585 if (restart_syscall &&
586 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
587 regs->u_regs[UREG_G1] = __NR_restart_syscall;
588 regs->tpc -= 4;
589 regs->tnpc -= 4;
590 pt_regs_clear_syscall(regs);
591 }
592
593 /* If there's no signal to deliver, we just put the saved sigmask
594 * back
595 */
596 if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
597 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
598 set_current_blocked(¤t->saved_sigmask);
599 }
600}
601
602void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
603{
604 if (thread_info_flags & _TIF_SIGPENDING)
605 do_signal(regs, orig_i0);
606 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
607 clear_thread_flag(TIF_NOTIFY_RESUME);
608 tracehook_notify_resume(regs);
609 if (current->replacement_session_keyring)
610 key_replace_session_keyring();
611 }
612}
613