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[PATCH] ocfs2: zero_user_page conversion
[wrt350n-kernel.git] / arch / sparc64 / kernel / signal.c
blob203e87301005c985a95d08208c94def7222d47a2
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_SPARC32_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/svr4.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 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
36
37 /* {set, get}context() needed for 64-bit SparcLinux userland. */
38 asmlinkage void sparc64_set_context(struct pt_regs *regs)
39 {
40 struct ucontext __user *ucp = (struct ucontext __user *)
41 regs->u_regs[UREG_I0];
42 mc_gregset_t __user *grp;
43 unsigned long pc, npc, tstate;
44 unsigned long fp, i7;
45 unsigned char fenab;
46 int err;
47
48 flush_user_windows();
49 if (get_thread_wsaved() ||
50 (((unsigned long)ucp) & (sizeof(unsigned long)-1)) ||
51 (!__access_ok(ucp, sizeof(*ucp))))
52 goto do_sigsegv;
53 grp = &ucp->uc_mcontext.mc_gregs;
54 err = __get_user(pc, &((*grp)[MC_PC]));
55 err |= __get_user(npc, &((*grp)[MC_NPC]));
56 if (err || ((pc | npc) & 3))
57 goto do_sigsegv;
58 if (regs->u_regs[UREG_I1]) {
59 sigset_t set;
60
61 if (_NSIG_WORDS == 1) {
62 if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
63 goto do_sigsegv;
64 } else {
65 if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
66 goto do_sigsegv;
67 }
68 sigdelsetmask(&set, ~_BLOCKABLE);
69 spin_lock_irq(&current->sighand->siglock);
70 current->blocked = set;
71 recalc_sigpending();
72 spin_unlock_irq(&current->sighand->siglock);
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 err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7]));
91 err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
92 err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
93 err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
94 err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
95 err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
96 err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
97 err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
98 err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
99
100 err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
101 err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
102 err |= __put_user(fp,
103 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
104 err |= __put_user(i7,
105 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
106
107 err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
108 if (fenab) {
109 unsigned long *fpregs = current_thread_info()->fpregs;
110 unsigned long fprs;
111
112 fprs_write(0);
113 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
114 if (fprs & FPRS_DL)
115 err |= copy_from_user(fpregs,
116 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
117 (sizeof(unsigned int) * 32));
118 if (fprs & FPRS_DU)
119 err |= copy_from_user(fpregs+16,
120 ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
121 (sizeof(unsigned int) * 32));
122 err |= __get_user(current_thread_info()->xfsr[0],
123 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
124 err |= __get_user(current_thread_info()->gsr[0],
125 &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
126 regs->tstate &= ~TSTATE_PEF;
127 }
128 if (err)
129 goto do_sigsegv;
130
131 return;
132 do_sigsegv:
133 force_sig(SIGSEGV, current);
134 }
135
136 asmlinkage void sparc64_get_context(struct pt_regs *regs)
137 {
138 struct ucontext __user *ucp = (struct ucontext __user *)
139 regs->u_regs[UREG_I0];
140 mc_gregset_t __user *grp;
141 mcontext_t __user *mcp;
142 unsigned long fp, i7;
143 unsigned char fenab;
144 int err;
145
146 synchronize_user_stack();
147 if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
148 goto do_sigsegv;
149
150 #if 1
151 fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
152 #else
153 fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
154 #endif
155
156 mcp = &ucp->uc_mcontext;
157 grp = &mcp->mc_gregs;
158
159 /* Skip over the trap instruction, first. */
160 if (test_thread_flag(TIF_32BIT)) {
161 regs->tpc = (regs->tnpc & 0xffffffff);
162 regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
163 } else {
164 regs->tpc = regs->tnpc;
165 regs->tnpc += 4;
166 }
167 err = 0;
168 if (_NSIG_WORDS == 1)
169 err |= __put_user(current->blocked.sig[0],
170 (unsigned long __user *)&ucp->uc_sigmask);
171 else
172 err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
173 sizeof(sigset_t));
174
175 err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
176 err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
177 err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
178 err |= __put_user(regs->y, &((*grp)[MC_Y]));
179 err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
180 err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
181 err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
182 err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
183 err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
184 err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
185 err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
186 err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
187 err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
188 err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
189 err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
190 err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
191 err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
192 err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
193 err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
194
195 err |= __get_user(fp,
196 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
197 err |= __get_user(i7,
198 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
199 err |= __put_user(fp, &(mcp->mc_fp));
200 err |= __put_user(i7, &(mcp->mc_i7));
201
202 err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
203 if (fenab) {
204 unsigned long *fpregs = current_thread_info()->fpregs;
205 unsigned long fprs;
206
207 fprs = current_thread_info()->fpsaved[0];
208 if (fprs & FPRS_DL)
209 err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
210 (sizeof(unsigned int) * 32));
211 if (fprs & FPRS_DU)
212 err |= copy_to_user(
213 ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
214 (sizeof(unsigned int) * 32));
215 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
216 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
217 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
218 }
219 if (err)
220 goto do_sigsegv;
221
222 return;
223 do_sigsegv:
224 force_sig(SIGSEGV, current);
225 }
226
227 struct rt_signal_frame {
228 struct sparc_stackf ss;
229 siginfo_t info;
230 struct pt_regs regs;
231 __siginfo_fpu_t __user *fpu_save;
232 stack_t stack;
233 sigset_t mask;
234 __siginfo_fpu_t fpu_state;
235 };
236
237 /* Align macros */
238 #define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7)))
239
240 static long _sigpause_common(old_sigset_t set)
241 {
242 set &= _BLOCKABLE;
243 spin_lock_irq(&current->sighand->siglock);
244 current->saved_sigmask = current->blocked;
245 siginitset(&current->blocked, set);
246 recalc_sigpending();
247 spin_unlock_irq(&current->sighand->siglock);
248
249 current->state = TASK_INTERRUPTIBLE;
250 schedule();
251 set_thread_flag(TIF_RESTORE_SIGMASK);
252 return -ERESTARTNOHAND;
253 }
254
255 asmlinkage long sys_sigpause(unsigned int set)
256 {
257 return _sigpause_common(set);
258 }
259
260 asmlinkage long sys_sigsuspend(old_sigset_t set)
261 {
262 return _sigpause_common(set);
263 }
264
265 static inline int
266 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
267 {
268 unsigned long *fpregs = current_thread_info()->fpregs;
269 unsigned long fprs;
270 int err;
271
272 err = __get_user(fprs, &fpu->si_fprs);
273 fprs_write(0);
274 regs->tstate &= ~TSTATE_PEF;
275 if (fprs & FPRS_DL)
276 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
277 (sizeof(unsigned int) * 32));
278 if (fprs & FPRS_DU)
279 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
280 (sizeof(unsigned int) * 32));
281 err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
282 err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
283 current_thread_info()->fpsaved[0] |= fprs;
284 return err;
285 }
286
287 void do_rt_sigreturn(struct pt_regs *regs)
288 {
289 struct rt_signal_frame __user *sf;
290 unsigned long tpc, tnpc, tstate;
291 __siginfo_fpu_t __user *fpu_save;
292 mm_segment_t old_fs;
293 sigset_t set;
294 stack_t st;
295 int err;
296
297 /* Always make any pending restarted system calls return -EINTR */
298 current_thread_info()->restart_block.fn = do_no_restart_syscall;
299
300 synchronize_user_stack ();
301 sf = (struct rt_signal_frame __user *)
302 (regs->u_regs [UREG_FP] + STACK_BIAS);
303
304 /* 1. Make sure we are not getting garbage from the user */
305 if (((unsigned long) sf) & 3)
306 goto segv;
307
308 err = get_user(tpc, &sf->regs.tpc);
309 err |= __get_user(tnpc, &sf->regs.tnpc);
310 if (test_thread_flag(TIF_32BIT)) {
311 tpc &= 0xffffffff;
312 tnpc &= 0xffffffff;
313 }
314 err |= ((tpc | tnpc) & 3);
315
316 /* 2. Restore the state */
317 err |= __get_user(regs->y, &sf->regs.y);
318 err |= __get_user(tstate, &sf->regs.tstate);
319 err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
320
321 /* User can only change condition codes and %asi in %tstate. */
322 regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
323 regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
324
325 err |= __get_user(fpu_save, &sf->fpu_save);
326 if (fpu_save)
327 err |= restore_fpu_state(regs, &sf->fpu_state);
328
329 err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
330 err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
331
332 if (err)
333 goto segv;
334
335 regs->tpc = tpc;
336 regs->tnpc = tnpc;
337
338 /* It is more difficult to avoid calling this function than to
339 call it and ignore errors. */
340 old_fs = get_fs();
341 set_fs(KERNEL_DS);
342 do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf);
343 set_fs(old_fs);
344
345 sigdelsetmask(&set, ~_BLOCKABLE);
346 spin_lock_irq(&current->sighand->siglock);
347 current->blocked = set;
348 recalc_sigpending();
349 spin_unlock_irq(&current->sighand->siglock);
350 return;
351 segv:
352 force_sig(SIGSEGV, current);
353 }
354
355 /* Checks if the fp is valid */
356 static int invalid_frame_pointer(void __user *fp, int fplen)
357 {
358 if (((unsigned long) fp) & 7)
359 return 1;
360 return 0;
361 }
362
363 static inline int
364 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
365 {
366 unsigned long *fpregs = (unsigned long *)(regs+1);
367 unsigned long fprs;
368 int err = 0;
369
370 fprs = current_thread_info()->fpsaved[0];
371 if (fprs & FPRS_DL)
372 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
373 (sizeof(unsigned int) * 32));
374 if (fprs & FPRS_DU)
375 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
376 (sizeof(unsigned int) * 32));
377 err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
378 err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
379 err |= __put_user(fprs, &fpu->si_fprs);
380
381 return err;
382 }
383
384 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
385 {
386 unsigned long sp;
387
388 sp = regs->u_regs[UREG_FP] + STACK_BIAS;
389
390 /* This is the X/Open sanctioned signal stack switching. */
391 if (ka->sa.sa_flags & SA_ONSTACK) {
392 if (!on_sig_stack(sp) &&
393 !((current->sas_ss_sp + current->sas_ss_size) & 7))
394 sp = current->sas_ss_sp + current->sas_ss_size;
395 }
396 return (void __user *)(sp - framesize);
397 }
398
399 static inline void
400 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
401 int signo, sigset_t *oldset, siginfo_t *info)
402 {
403 struct rt_signal_frame __user *sf;
404 int sigframe_size, err;
405
406 /* 1. Make sure everything is clean */
407 synchronize_user_stack();
408 save_and_clear_fpu();
409
410 sigframe_size = RT_ALIGNEDSZ;
411 if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
412 sigframe_size -= sizeof(__siginfo_fpu_t);
413
414 sf = (struct rt_signal_frame __user *)
415 get_sigframe(ka, regs, sigframe_size);
416
417 if (invalid_frame_pointer (sf, sigframe_size))
418 goto sigill;
419
420 if (get_thread_wsaved() != 0)
421 goto sigill;
422
423 /* 2. Save the current process state */
424 err = copy_to_user(&sf->regs, regs, sizeof (*regs));
425
426 if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
427 err |= save_fpu_state(regs, &sf->fpu_state);
428 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
429 } else {
430 err |= __put_user(0, &sf->fpu_save);
431 }
432
433 /* Setup sigaltstack */
434 err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
435 err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
436 err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
437
438 err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
439
440 err |= copy_in_user((u64 __user *)sf,
441 (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
442 sizeof(struct reg_window));
443
444 if (info)
445 err |= copy_siginfo_to_user(&sf->info, info);
446 else {
447 err |= __put_user(signo, &sf->info.si_signo);
448 err |= __put_user(SI_NOINFO, &sf->info.si_code);
449 }
450 if (err)
451 goto sigsegv;
452
453 /* 3. signal handler back-trampoline and parameters */
454 regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
455 regs->u_regs[UREG_I0] = signo;
456 regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
457
458 /* The sigcontext is passed in this way because of how it
459 * is defined in GLIBC's /usr/include/bits/sigcontext.h
460 * for sparc64. It includes the 128 bytes of siginfo_t.
461 */
462 regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
463
464 /* 5. signal handler */
465 regs->tpc = (unsigned long) ka->sa.sa_handler;
466 regs->tnpc = (regs->tpc + 4);
467 if (test_thread_flag(TIF_32BIT)) {
468 regs->tpc &= 0xffffffff;
469 regs->tnpc &= 0xffffffff;
470 }
471 /* 4. return to kernel instructions */
472 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
473 return;
474
475 sigill:
476 do_exit(SIGILL);
477 sigsegv:
478 force_sigsegv(signo, current);
479 }
480
481 static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
482 siginfo_t *info,
483 sigset_t *oldset, struct pt_regs *regs)
484 {
485 setup_rt_frame(ka, regs, signr, oldset,
486 (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
487 spin_lock_irq(&current->sighand->siglock);
488 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
489 if (!(ka->sa.sa_flags & SA_NOMASK))
490 sigaddset(&current->blocked,signr);
491 recalc_sigpending();
492 spin_unlock_irq(&current->sighand->siglock);
493 }
494
495 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
496 struct sigaction *sa)
497 {
498 switch (regs->u_regs[UREG_I0]) {
499 case ERESTART_RESTARTBLOCK:
500 case ERESTARTNOHAND:
501 no_system_call_restart:
502 regs->u_regs[UREG_I0] = EINTR;
503 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
504 break;
505 case ERESTARTSYS:
506 if (!(sa->sa_flags & SA_RESTART))
507 goto no_system_call_restart;
508 /* fallthrough */
509 case ERESTARTNOINTR:
510 regs->u_regs[UREG_I0] = orig_i0;
511 regs->tpc -= 4;
512 regs->tnpc -= 4;
513 }
514 }
515
516 /* Note that 'init' is a special process: it doesn't get signals it doesn't
517 * want to handle. Thus you cannot kill init even with a SIGKILL even by
518 * mistake.
519 */
520 static void do_signal(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall)
521 {
522 siginfo_t info;
523 struct signal_deliver_cookie cookie;
524 struct k_sigaction ka;
525 int signr;
526 sigset_t *oldset;
527
528 cookie.restart_syscall = restart_syscall;
529 cookie.orig_i0 = orig_i0;
530
531 if (test_thread_flag(TIF_RESTORE_SIGMASK))
532 oldset = &current->saved_sigmask;
533 else
534 oldset = &current->blocked;
535
536 #ifdef CONFIG_SPARC32_COMPAT
537 if (test_thread_flag(TIF_32BIT)) {
538 extern void do_signal32(sigset_t *, struct pt_regs *,
539 unsigned long, int);
540 do_signal32(oldset, regs, orig_i0,
541 cookie.restart_syscall);
542 return;
543 }
544 #endif
545
546 signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
547 if (signr > 0) {
548 if (cookie.restart_syscall)
549 syscall_restart(orig_i0, regs, &ka.sa);
550 handle_signal(signr, &ka, &info, oldset, regs);
551
552 /* a signal was successfully delivered; the saved
553 * sigmask will have been stored in the signal frame,
554 * and will be restored by sigreturn, so we can simply
555 * clear the TIF_RESTORE_SIGMASK flag.
556 */
557 if (test_thread_flag(TIF_RESTORE_SIGMASK))
558 clear_thread_flag(TIF_RESTORE_SIGMASK);
559 return;
560 }
561 if (cookie.restart_syscall &&
562 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
563 regs->u_regs[UREG_I0] == ERESTARTSYS ||
564 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
565 /* replay the system call when we are done */
566 regs->u_regs[UREG_I0] = cookie.orig_i0;
567 regs->tpc -= 4;
568 regs->tnpc -= 4;
569 }
570 if (cookie.restart_syscall &&
571 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
572 regs->u_regs[UREG_G1] = __NR_restart_syscall;
573 regs->tpc -= 4;
574 regs->tnpc -= 4;
575 }
576
577 /* if there's no signal to deliver, we just put the saved sigmask
578 * back
579 */
580 if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
581 clear_thread_flag(TIF_RESTORE_SIGMASK);
582 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
583 }
584 }
585
586 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall,
587 unsigned long thread_info_flags)
588 {
589 if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
590 do_signal(regs, orig_i0, restart_syscall);
591 }
592
593 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
594 {
595 struct signal_deliver_cookie *cp = cookie;
596
597 if (cp->restart_syscall &&
598 (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
599 regs->u_regs[UREG_I0] == ERESTARTSYS ||
600 regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
601 /* replay the system call when we are done */
602 regs->u_regs[UREG_I0] = cp->orig_i0;
603 regs->tpc -= 4;
604 regs->tnpc -= 4;
605 cp->restart_syscall = 0;
606 }
607 if (cp->restart_syscall &&
608 regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
609 regs->u_regs[UREG_G1] = __NR_restart_syscall;
610 regs->tpc -= 4;
611 regs->tnpc -= 4;
612 cp->restart_syscall = 0;
613 }
614 }
WRT350N Kernel Patches