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SUNRPC: Fix a memory leak in the backchannel code
[linux/fpc-iii.git] / arch / sparc / kernel / signal_64.c
blobd58d3edd05b36cedd4dc405407b373dc1c05a566
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. */
42 asmlinkage 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;
135 do_sigsegv:
136 force_sig(SIGSEGV, current);
137 }
138
139 asmlinkage 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, &current->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;
226 do_sigsegv:
227 force_sig(SIGSEGV, current);
228 }
229
230 struct 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
240 static 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
258 asmlinkage long sys_sigpause(unsigned int set)
259 {
260 return _sigpause_common(set);
261 }
262
263 asmlinkage long sys_sigsuspend(old_sigset_t set)
264 {
265 return _sigpause_common(set);
266 }
267
268 void 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 if (err || do_sigaltstack(&sf->stack, NULL, (unsigned long)sf) == -EFAULT)
311 goto segv;
312
313 err |= __get_user(rwin_save, &sf->rwin_save);
314 if (!err && rwin_save) {
315 if (restore_rwin_state(rwin_save))
316 goto segv;
317 }
318
319 regs->tpc = tpc;
320 regs->tnpc = tnpc;
321
322 /* Prevent syscall restart. */
323 pt_regs_clear_syscall(regs);
324
325 sigdelsetmask(&set, ~_BLOCKABLE);
326 set_current_blocked(&set);
327 return;
328 segv:
329 force_sig(SIGSEGV, current);
330 }
331
332 /* Checks if the fp is valid */
333 static int invalid_frame_pointer(void __user *fp)
334 {
335 if (((unsigned long) fp) & 15)
336 return 1;
337 return 0;
338 }
339
340 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
341 {
342 unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
343
344 /*
345 * If we are on the alternate signal stack and would overflow it, don't.
346 * Return an always-bogus address instead so we will die with SIGSEGV.
347 */
348 if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
349 return (void __user *) -1L;
350
351 /* This is the X/Open sanctioned signal stack switching. */
352 if (ka->sa.sa_flags & SA_ONSTACK) {
353 if (sas_ss_flags(sp) == 0)
354 sp = current->sas_ss_sp + current->sas_ss_size;
355 }
356
357 sp -= framesize;
358
359 /* Always align the stack frame. This handles two cases. First,
360 * sigaltstack need not be mindful of platform specific stack
361 * alignment. Second, if we took this signal because the stack
362 * is not aligned properly, we'd like to take the signal cleanly
363 * and report that.
364 */
365 sp &= ~15UL;
366
367 return (void __user *) sp;
368 }
369
370 static inline int
371 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
372 int signo, sigset_t *oldset, siginfo_t *info)
373 {
374 struct rt_signal_frame __user *sf;
375 int wsaved, err, sf_size;
376 void __user *tail;
377
378 /* 1. Make sure everything is clean */
379 synchronize_user_stack();
380 save_and_clear_fpu();
381
382 wsaved = get_thread_wsaved();
383
384 sf_size = sizeof(struct rt_signal_frame);
385 if (current_thread_info()->fpsaved[0] & FPRS_FEF)
386 sf_size += sizeof(__siginfo_fpu_t);
387 if (wsaved)
388 sf_size += sizeof(__siginfo_rwin_t);
389 sf = (struct rt_signal_frame __user *)
390 get_sigframe(ka, regs, sf_size);
391
392 if (invalid_frame_pointer (sf))
393 goto sigill;
394
395 tail = (sf + 1);
396
397 /* 2. Save the current process state */
398 err = copy_to_user(&sf->regs, regs, sizeof (*regs));
399
400 if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
401 __siginfo_fpu_t __user *fpu_save = tail;
402 tail += sizeof(__siginfo_fpu_t);
403 err |= save_fpu_state(regs, fpu_save);
404 err |= __put_user((u64)fpu_save, &sf->fpu_save);
405 } else {
406 err |= __put_user(0, &sf->fpu_save);
407 }
408 if (wsaved) {
409 __siginfo_rwin_t __user *rwin_save = tail;
410 tail += sizeof(__siginfo_rwin_t);
411 err |= save_rwin_state(wsaved, rwin_save);
412 err |= __put_user((u64)rwin_save, &sf->rwin_save);
413 set_thread_wsaved(0);
414 } else {
415 err |= __put_user(0, &sf->rwin_save);
416 }
417
418 /* Setup sigaltstack */
419 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
420 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
421 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
422
423 err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
424
425 if (!wsaved) {
426 err |= copy_in_user((u64 __user *)sf,
427 (u64 __user *)(regs->u_regs[UREG_FP] +
428 STACK_BIAS),
429 sizeof(struct reg_window));
430 } else {
431 struct reg_window *rp;
432
433 rp = &current_thread_info()->reg_window[wsaved - 1];
434 err |= copy_to_user(sf, rp, sizeof(struct reg_window));
435 }
436 if (info)
437 err |= copy_siginfo_to_user(&sf->info, info);
438 else {
439 err |= __put_user(signo, &sf->info.si_signo);
440 err |= __put_user(SI_NOINFO, &sf->info.si_code);
441 }
442 if (err)
443 goto sigsegv;
444
445 /* 3. signal handler back-trampoline and parameters */
446 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
447 regs->u_regs[UREG_I0] = signo;
448 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
449
450 /* The sigcontext is passed in this way because of how it
451 * is defined in GLIBC's /usr/include/bits/sigcontext.h
452 * for sparc64. It includes the 128 bytes of siginfo_t.
453 */
454 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
455
456 /* 5. signal handler */
457 regs->tpc = (unsigned long) ka->sa.sa_handler;
458 regs->tnpc = (regs->tpc + 4);
459 if (test_thread_flag(TIF_32BIT)) {
460 regs->tpc &= 0xffffffff;
461 regs->tnpc &= 0xffffffff;
462 }
463 /* 4. return to kernel instructions */
464 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
465 return 0;
466
467 sigill:
468 do_exit(SIGILL);
469 return -EINVAL;
470
471 sigsegv:
472 force_sigsegv(signo, current);
473 return -EFAULT;
474 }
475
476 static inline int handle_signal(unsigned long signr, struct k_sigaction *ka,
477 siginfo_t *info,
478 sigset_t *oldset, struct pt_regs *regs)
479 {
480 sigset_t blocked;
481 int err;
482
483 err = setup_rt_frame(ka, regs, signr, oldset,
484 (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
485 if (err)
486 return err;
487 sigorsets(&blocked, &current->blocked, &ka->sa.sa_mask);
488 if (!(ka->sa.sa_flags & SA_NOMASK))
489 sigaddset(&blocked, signr);
490 set_current_blocked(&blocked);
491
492 tracehook_signal_handler(signr, info, ka, regs, 0);
493
494 return 0;
495 }
496
497 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
498 struct sigaction *sa)
499 {
500 switch (regs->u_regs[UREG_I0]) {
501 case ERESTART_RESTARTBLOCK:
502 case ERESTARTNOHAND:
503 no_system_call_restart:
504 regs->u_regs[UREG_I0] = EINTR;
505 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
506 break;
507 case ERESTARTSYS:
508 if (!(sa->sa_flags & SA_RESTART))
509 goto no_system_call_restart;
510 /* fallthrough */
511 case ERESTARTNOINTR:
512 regs->u_regs[UREG_I0] = orig_i0;
513 regs->tpc -= 4;
514 regs->tnpc -= 4;
515 }
516 }
517
518 /* Note that 'init' is a special process: it doesn't get signals it doesn't
519 * want to handle. Thus you cannot kill init even with a SIGKILL even by
520 * mistake.
521 */
522 static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
523 {
524 struct k_sigaction ka;
525 int restart_syscall;
526 sigset_t *oldset;
527 siginfo_t info;
528 int signr;
529
530 /* It's a lot of work and synchronization to add a new ptrace
531 * register for GDB to save and restore in order to get
532 * orig_i0 correct for syscall restarts when debugging.
533 *
534 * Although it should be the case that most of the global
535 * registers are volatile across a system call, glibc already
536 * depends upon that fact that we preserve them. So we can't
537 * just use any global register to save away the orig_i0 value.
538 *
539 * In particular %g2, %g3, %g4, and %g5 are all assumed to be
540 * preserved across a system call trap by various pieces of
541 * code in glibc.
542 *
543 * %g7 is used as the "thread register". %g6 is not used in
544 * any fixed manner. %g6 is used as a scratch register and
545 * a compiler temporary, but it's value is never used across
546 * a system call. Therefore %g6 is usable for orig_i0 storage.
547 */
548 if (pt_regs_is_syscall(regs) &&
549 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
550 regs->u_regs[UREG_G6] = orig_i0;
551
552 if (current_thread_info()->status & TS_RESTORE_SIGMASK)
553 oldset = &current->saved_sigmask;
554 else
555 oldset = &current->blocked;
556
557 #ifdef CONFIG_COMPAT
558 if (test_thread_flag(TIF_32BIT)) {
559 extern void do_signal32(sigset_t *, struct pt_regs *);
560 do_signal32(oldset, regs);
561 return;
562 }
563 #endif
564
565 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
566
567 restart_syscall = 0;
568 if (pt_regs_is_syscall(regs) &&
569 (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
570 restart_syscall = 1;
571 orig_i0 = regs->u_regs[UREG_G6];
572 }
573
574 if (signr > 0) {
575 if (restart_syscall)
576 syscall_restart(orig_i0, regs, &ka.sa);
577 if (handle_signal(signr, &ka, &info, oldset, regs) == 0) {
578 /* A signal was successfully delivered; the saved
579 * sigmask will have been stored in the signal frame,
580 * and will be restored by sigreturn, so we can simply
581 * clear the TS_RESTORE_SIGMASK flag.
582 */
583 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
584 }
585 return;
586 }
587 if (restart_syscall &&
588 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
589 regs->u_regs[UREG_I0] == ERESTARTSYS ||
590 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
591 /* replay the system call when we are done */
592 regs->u_regs[UREG_I0] = orig_i0;
593 regs->tpc -= 4;
594 regs->tnpc -= 4;
595 pt_regs_clear_syscall(regs);
596 }
597 if (restart_syscall &&
598 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
599 regs->u_regs[UREG_G1] = __NR_restart_syscall;
600 regs->tpc -= 4;
601 regs->tnpc -= 4;
602 pt_regs_clear_syscall(regs);
603 }
604
605 /* If there's no signal to deliver, we just put the saved sigmask
606 * back
607 */
608 if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
609 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
610 set_current_blocked(&current->saved_sigmask);
611 }
612 }
613
614 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
615 {
616 if (thread_info_flags & _TIF_SIGPENDING)
617 do_signal(regs, orig_i0);
618 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
619 clear_thread_flag(TIF_NOTIFY_RESUME);
620 tracehook_notify_resume(regs);
621 if (current->replacement_session_keyring)
622 key_replace_session_keyring();
623 }
624 }
625
Linux with added FPC-III support