Commit | Line | Data |
---|---|---|
5a0015d6 | 1 | /* |
29c4dfd9 | 2 | * arch/xtensa/kernel/signal.c |
5a0015d6 | 3 | * |
29c4dfd9 | 4 | * Default platform functions. |
5a0015d6 | 5 | * |
29c4dfd9 CZ |
6 | * This file is subject to the terms and conditions of the GNU General Public |
7 | * License. See the file "COPYING" in the main directory of this archive | |
8 | * for more details. | |
5a0015d6 | 9 | * |
29c4dfd9 CZ |
10 | * Copyright (C) 2005, 2006 Tensilica Inc. |
11 | * Copyright (C) 1991, 1992 Linus Torvalds | |
12 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson | |
5a0015d6 | 13 | * |
29c4dfd9 CZ |
14 | * Chris Zankel <chris@zankel.net> |
15 | * Joe Taylor <joe@tensilica.com> | |
5a0015d6 CZ |
16 | */ |
17 | ||
5a0015d6 CZ |
18 | #include <linux/signal.h> |
19 | #include <linux/errno.h> | |
5a0015d6 | 20 | #include <linux/ptrace.h> |
5a0015d6 | 21 | #include <linux/personality.h> |
29c4dfd9 CZ |
22 | #include <linux/freezer.h> |
23 | ||
5a0015d6 CZ |
24 | #include <asm/ucontext.h> |
25 | #include <asm/uaccess.h> | |
5a0015d6 | 26 | #include <asm/cacheflush.h> |
29c4dfd9 CZ |
27 | #include <asm/coprocessor.h> |
28 | #include <asm/unistd.h> | |
5a0015d6 CZ |
29 | |
30 | #define DEBUG_SIG 0 | |
31 | ||
32 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
33 | ||
5a0015d6 CZ |
34 | asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset); |
35 | ||
36 | extern struct task_struct *coproc_owners[]; | |
37 | ||
29c4dfd9 | 38 | extern void release_all_cp (struct task_struct *); |
5a0015d6 | 39 | |
29c4dfd9 CZ |
40 | struct rt_sigframe |
41 | { | |
42 | struct siginfo info; | |
43 | struct ucontext uc; | |
44 | cp_state_t cpstate; | |
45 | unsigned char retcode[6]; | |
46 | unsigned int window[4]; | |
47 | }; | |
48 | ||
49 | /* | |
50 | * Flush register windows stored in pt_regs to stack. | |
51 | * Returns 1 for errors. | |
52 | * | |
53 | * Note that windowbase, windowstart, and wmask are not updated! | |
5a0015d6 CZ |
54 | */ |
55 | ||
29c4dfd9 CZ |
56 | int |
57 | flush_window_regs_user(struct pt_regs *regs) | |
5a0015d6 | 58 | { |
29c4dfd9 CZ |
59 | const unsigned long ws = regs->windowstart; |
60 | const unsigned long wb = regs->windowbase; | |
61 | unsigned long sp = 0; | |
62 | unsigned long wm; | |
63 | int err = 1; | |
64 | int base; | |
5a0015d6 | 65 | |
29c4dfd9 | 66 | /* Return if no other frames. */ |
5a0015d6 | 67 | |
29c4dfd9 CZ |
68 | if (regs->wmask == 1) |
69 | return 0; | |
5a0015d6 | 70 | |
29c4dfd9 | 71 | /* Rotate windowmask and skip empty frames. */ |
5a0015d6 | 72 | |
29c4dfd9 CZ |
73 | wm = (ws >> wb) | (ws << (XCHAL_NUM_AREGS / 4 - wb)); |
74 | base = (XCHAL_NUM_AREGS / 4) - (regs->wmask >> 4); | |
75 | ||
76 | /* For call8 or call12 frames, we need the previous stack pointer. */ | |
5a0015d6 | 77 | |
29c4dfd9 CZ |
78 | if ((regs->wmask & 2) == 0) |
79 | if (__get_user(sp, (int*)(regs->areg[base * 4 + 1] - 12))) | |
80 | goto errout; | |
5a0015d6 | 81 | |
29c4dfd9 | 82 | /* Spill frames to stack. */ |
5a0015d6 | 83 | |
29c4dfd9 | 84 | while (base < XCHAL_NUM_AREGS / 4) { |
5a0015d6 | 85 | |
29c4dfd9 CZ |
86 | int m = (wm >> base); |
87 | int inc = 0; | |
5a0015d6 | 88 | |
29c4dfd9 | 89 | /* Save registers a4..a7 (call8) or a4...a11 (call12) */ |
5a0015d6 | 90 | |
29c4dfd9 CZ |
91 | if (m & 2) { /* call4 */ |
92 | inc = 1; | |
5a0015d6 | 93 | |
29c4dfd9 CZ |
94 | } else if (m & 4) { /* call8 */ |
95 | if (copy_to_user((void*)(sp - 32), | |
96 | ®s->areg[(base + 1) * 4], 16)) | |
97 | goto errout; | |
98 | inc = 2; | |
5a0015d6 | 99 | |
29c4dfd9 CZ |
100 | } else if (m & 8) { /* call12 */ |
101 | if (copy_to_user((void*)(sp - 48), | |
102 | ®s->areg[(base + 1) * 4], 32)) | |
103 | goto errout; | |
104 | inc = 3; | |
105 | } | |
5a0015d6 | 106 | |
29c4dfd9 | 107 | /* Save current frame a0..a3 under next SP */ |
5a0015d6 | 108 | |
29c4dfd9 CZ |
109 | sp = regs->areg[((base + inc) * 4 + 1) % XCHAL_NUM_AREGS]; |
110 | if (copy_to_user((void*)(sp - 16), ®s->areg[base * 4], 16)) | |
111 | goto errout; | |
112 | ||
113 | /* Get current stack pointer for next loop iteration. */ | |
114 | ||
115 | sp = regs->areg[base * 4 + 1]; | |
116 | base += inc; | |
117 | } | |
118 | ||
119 | return 0; | |
5a0015d6 | 120 | |
29c4dfd9 CZ |
121 | errout: |
122 | return err; | |
123 | } | |
5a0015d6 CZ |
124 | |
125 | /* | |
29c4dfd9 CZ |
126 | * Note: We don't copy double exception 'regs', we have to finish double exc. |
127 | * first before we return to signal handler! This dbl.exc.handler might cause | |
128 | * another double exception, but I think we are fine as the situation is the | |
129 | * same as if we had returned to the signal handerl and got an interrupt | |
130 | * immediately... | |
5a0015d6 CZ |
131 | */ |
132 | ||
29c4dfd9 CZ |
133 | static int |
134 | setup_sigcontext(struct sigcontext __user *sc, cp_state_t *cpstate, | |
135 | struct pt_regs *regs, unsigned long mask) | |
5a0015d6 | 136 | { |
29c4dfd9 | 137 | int err = 0; |
5a0015d6 | 138 | |
29c4dfd9 CZ |
139 | #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) |
140 | COPY(pc); | |
141 | COPY(ps); | |
142 | COPY(lbeg); | |
143 | COPY(lend); | |
144 | COPY(lcount); | |
145 | COPY(sar); | |
146 | #undef COPY | |
5a0015d6 | 147 | |
29c4dfd9 CZ |
148 | err |= flush_window_regs_user(regs); |
149 | err |= __copy_to_user (sc->sc_a, regs->areg, 16 * 4); | |
5a0015d6 | 150 | |
29c4dfd9 | 151 | // err |= __copy_to_user (sc->sc_a, regs->areg, XCHAL_NUM_AREGS * 4) |
5a0015d6 | 152 | |
29c4dfd9 CZ |
153 | #if XCHAL_HAVE_CP |
154 | # error Coprocessors unsupported | |
155 | err |= save_cpextra(cpstate); | |
156 | err |= __put_user(err ? NULL : cpstate, &sc->sc_cpstate); | |
5a0015d6 | 157 | #endif |
29c4dfd9 CZ |
158 | /* non-iBCS2 extensions.. */ |
159 | err |= __put_user(mask, &sc->oldmask); | |
5a0015d6 | 160 | |
29c4dfd9 CZ |
161 | return err; |
162 | } | |
5a0015d6 CZ |
163 | |
164 | static int | |
29c4dfd9 | 165 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
5a0015d6 | 166 | { |
5a0015d6 CZ |
167 | unsigned int err = 0; |
168 | unsigned long ps; | |
5a0015d6 CZ |
169 | |
170 | #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) | |
171 | COPY(pc); | |
5a0015d6 CZ |
172 | COPY(lbeg); |
173 | COPY(lend); | |
174 | COPY(lcount); | |
175 | COPY(sar); | |
5a0015d6 CZ |
176 | #undef COPY |
177 | ||
29c4dfd9 CZ |
178 | /* All registers were flushed to stack. Start with a prestine frame. */ |
179 | ||
180 | regs->wmask = 1; | |
181 | regs->windowbase = 0; | |
182 | regs->windowstart = 1; | |
183 | ||
5a0015d6 CZ |
184 | /* For PS, restore only PS.CALLINC. |
185 | * Assume that all other bits are either the same as for the signal | |
186 | * handler, or the user mode value doesn't matter (e.g. PS.OWB). | |
187 | */ | |
188 | err |= __get_user(ps, &sc->sc_ps); | |
29c4dfd9 | 189 | regs->ps = (regs->ps & ~PS_CALLINC_MASK) | (ps & PS_CALLINC_MASK); |
5a0015d6 CZ |
190 | |
191 | /* Additional corruption checks */ | |
192 | ||
5a0015d6 | 193 | if ((regs->lcount > 0) |
29c4dfd9 | 194 | && ((regs->lbeg > TASK_SIZE) || (regs->lend > TASK_SIZE)) ) |
5a0015d6 CZ |
195 | err = 1; |
196 | ||
29c4dfd9 | 197 | err |= __copy_from_user(regs->areg, sc->sc_a, 16 * 4); |
5a0015d6 | 198 | |
29c4dfd9 CZ |
199 | #if XCHAL_HAVE_CP |
200 | # error Coprocessors unsupported | |
201 | /* The signal handler may have used coprocessors in which | |
202 | * case they are still enabled. We disable them to force a | |
203 | * reloading of the original task's CP state by the lazy | |
204 | * context-switching mechanisms of CP exception handling. | |
205 | * Also, we essentially discard any coprocessor state that the | |
206 | * signal handler created. */ | |
5a0015d6 | 207 | |
29c4dfd9 CZ |
208 | if (!err) { |
209 | struct task_struct *tsk = current; | |
210 | release_all_cp(tsk); | |
211 | err |= __copy_from_user(tsk->thread.cpextra, sc->sc_cpstate, | |
212 | XTENSA_CP_EXTRA_SIZE); | |
5a0015d6 CZ |
213 | } |
214 | #endif | |
5a0015d6 | 215 | |
29c4dfd9 | 216 | regs->syscall = -1; /* disable syscall checks */ |
5a0015d6 CZ |
217 | return err; |
218 | } | |
219 | ||
5a0015d6 | 220 | |
5a0015d6 | 221 | |
29c4dfd9 CZ |
222 | /* |
223 | * Do a signal return; undo the signal stack. | |
224 | */ | |
5a0015d6 | 225 | |
29c4dfd9 CZ |
226 | asmlinkage long xtensa_rt_sigreturn(long a0, long a1, long a2, long a3, |
227 | long a4, long a5, struct pt_regs *regs) | |
5a0015d6 | 228 | { |
29c4dfd9 | 229 | struct rt_sigframe __user *frame; |
5a0015d6 | 230 | sigset_t set; |
5a0015d6 | 231 | int ret; |
29c4dfd9 | 232 | |
5a0015d6 | 233 | if (regs->depc > 64) |
29c4dfd9 CZ |
234 | panic("rt_sigreturn in double exception!\n"); |
235 | ||
236 | frame = (struct rt_sigframe __user *) regs->areg[1]; | |
5a0015d6 | 237 | |
b9e122c8 | 238 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
5a0015d6 CZ |
239 | goto badframe; |
240 | ||
241 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
242 | goto badframe; | |
243 | ||
244 | sigdelsetmask(&set, ~_BLOCKABLE); | |
245 | spin_lock_irq(¤t->sighand->siglock); | |
246 | current->blocked = set; | |
247 | recalc_sigpending(); | |
248 | spin_unlock_irq(¤t->sighand->siglock); | |
249 | ||
250 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext)) | |
251 | goto badframe; | |
29c4dfd9 | 252 | |
5a0015d6 CZ |
253 | ret = regs->areg[2]; |
254 | ||
29c4dfd9 | 255 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->areg[1]) == -EFAULT) |
5a0015d6 | 256 | goto badframe; |
5a0015d6 CZ |
257 | |
258 | return ret; | |
259 | ||
260 | badframe: | |
261 | force_sig(SIGSEGV, current); | |
262 | return 0; | |
263 | } | |
264 | ||
29c4dfd9 | 265 | |
5a0015d6 CZ |
266 | |
267 | /* | |
29c4dfd9 | 268 | * Set up a signal frame. |
5a0015d6 | 269 | */ |
5a0015d6 CZ |
270 | |
271 | static int | |
29c4dfd9 | 272 | gen_return_code(unsigned char *codemem) |
5a0015d6 | 273 | { |
5a0015d6 CZ |
274 | int err = 0; |
275 | ||
29c4dfd9 CZ |
276 | /* |
277 | * The 12-bit immediate is really split up within the 24-bit MOVI | |
278 | * instruction. As long as the above system call numbers fit within | |
279 | * 8-bits, the following code works fine. See the Xtensa ISA for | |
280 | * details. | |
5a0015d6 | 281 | */ |
5a0015d6 | 282 | |
29c4dfd9 CZ |
283 | #if __NR_rt_sigreturn > 255 |
284 | # error Generating the MOVI instruction below breaks! | |
5a0015d6 CZ |
285 | #endif |
286 | ||
5a0015d6 | 287 | #ifdef __XTENSA_EB__ /* Big Endian version */ |
29c4dfd9 CZ |
288 | /* Generate instruction: MOVI a2, __NR_rt_sigreturn */ |
289 | err |= __put_user(0x22, &codemem[0]); | |
290 | err |= __put_user(0x0a, &codemem[1]); | |
291 | err |= __put_user(__NR_rt_sigreturn, &codemem[2]); | |
292 | /* Generate instruction: SYSCALL */ | |
293 | err |= __put_user(0x00, &codemem[3]); | |
294 | err |= __put_user(0x05, &codemem[4]); | |
295 | err |= __put_user(0x00, &codemem[5]); | |
5a0015d6 CZ |
296 | |
297 | #elif defined __XTENSA_EL__ /* Little Endian version */ | |
29c4dfd9 CZ |
298 | /* Generate instruction: MOVI a2, __NR_rt_sigreturn */ |
299 | err |= __put_user(0x22, &codemem[0]); | |
300 | err |= __put_user(0xa0, &codemem[1]); | |
301 | err |= __put_user(__NR_rt_sigreturn, &codemem[2]); | |
302 | /* Generate instruction: SYSCALL */ | |
303 | err |= __put_user(0x00, &codemem[3]); | |
304 | err |= __put_user(0x50, &codemem[4]); | |
305 | err |= __put_user(0x00, &codemem[5]); | |
5a0015d6 | 306 | #else |
29c4dfd9 | 307 | # error Must use compiler for Xtensa processors. |
5a0015d6 | 308 | #endif |
5a0015d6 CZ |
309 | |
310 | /* Flush generated code out of the data cache */ | |
311 | ||
173d6681 CZ |
312 | if (err == 0) { |
313 | __invalidate_icache_range((unsigned long)codemem, 6UL); | |
314 | __flush_invalidate_dcache_range((unsigned long)codemem, 6UL); | |
315 | } | |
5a0015d6 CZ |
316 | |
317 | return err; | |
318 | } | |
319 | ||
5a0015d6 | 320 | |
29c4dfd9 | 321 | static void setup_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
5a0015d6 CZ |
322 | sigset_t *set, struct pt_regs *regs) |
323 | { | |
29c4dfd9 | 324 | struct rt_sigframe *frame; |
5a0015d6 CZ |
325 | int err = 0; |
326 | int signal; | |
29c4dfd9 | 327 | unsigned long sp, ra; |
5a0015d6 | 328 | |
29c4dfd9 | 329 | sp = regs->areg[1]; |
5a0015d6 | 330 | |
29c4dfd9 CZ |
331 | if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! on_sig_stack(sp)) { |
332 | sp = current->sas_ss_sp + current->sas_ss_size; | |
5a0015d6 CZ |
333 | } |
334 | ||
29c4dfd9 | 335 | frame = (void *)((sp - sizeof(*frame)) & -16ul); |
5a0015d6 | 336 | |
5a0015d6 CZ |
337 | if (regs->depc > 64) |
338 | panic ("Double exception sys_sigreturn\n"); | |
339 | ||
29c4dfd9 | 340 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) { |
5a0015d6 | 341 | goto give_sigsegv; |
29c4dfd9 | 342 | } |
5a0015d6 CZ |
343 | |
344 | signal = current_thread_info()->exec_domain | |
345 | && current_thread_info()->exec_domain->signal_invmap | |
346 | && sig < 32 | |
347 | ? current_thread_info()->exec_domain->signal_invmap[sig] | |
348 | : sig; | |
349 | ||
29c4dfd9 CZ |
350 | if (ka->sa.sa_flags & SA_SIGINFO) { |
351 | err |= copy_siginfo_to_user(&frame->info, info); | |
352 | } | |
353 | ||
354 | /* Create the user context. */ | |
5a0015d6 | 355 | |
5a0015d6 CZ |
356 | err |= __put_user(0, &frame->uc.uc_flags); |
357 | err |= __put_user(0, &frame->uc.uc_link); | |
358 | err |= __put_user((void *)current->sas_ss_sp, | |
359 | &frame->uc.uc_stack.ss_sp); | |
360 | err |= __put_user(sas_ss_flags(regs->areg[1]), | |
361 | &frame->uc.uc_stack.ss_flags); | |
362 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
363 | err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->cpstate, | |
364 | regs, set->sig[0]); | |
365 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
366 | ||
367 | /* Create sys_rt_sigreturn syscall in stack frame */ | |
5a0015d6 | 368 | |
29c4dfd9 CZ |
369 | err |= gen_return_code(frame->retcode); |
370 | ||
371 | if (err) { | |
5a0015d6 | 372 | goto give_sigsegv; |
29c4dfd9 CZ |
373 | } |
374 | ||
5a0015d6 | 375 | |
29c4dfd9 CZ |
376 | /* |
377 | * Create signal handler execution context. | |
5a0015d6 CZ |
378 | * Return context not modified until this point. |
379 | */ | |
29c4dfd9 CZ |
380 | |
381 | /* Set up registers for signal handler */ | |
382 | start_thread(regs, (unsigned long) ka->sa.sa_handler, | |
383 | (unsigned long) frame); | |
384 | ||
385 | /* Set up a stack frame for a call4 | |
386 | * Note: PS.CALLINC is set to one by start_thread | |
387 | */ | |
388 | ra = (unsigned long) frame->retcode; | |
389 | regs->areg[4] = (((unsigned long) ra) & 0x3fffffff) | 0x40000000; | |
390 | regs->areg[6] = (unsigned long) signal; | |
391 | regs->areg[7] = (unsigned long) &frame->info; | |
392 | regs->areg[8] = (unsigned long) &frame->uc; | |
5a0015d6 CZ |
393 | |
394 | /* Set access mode to USER_DS. Nomenclature is outdated, but | |
395 | * functionality is used in uaccess.h | |
396 | */ | |
397 | set_fs(USER_DS); | |
398 | ||
399 | #if DEBUG_SIG | |
400 | printk("SIG rt deliver (%s:%d): signal=%d sp=%p pc=%08x\n", | |
401 | current->comm, current->pid, signal, frame, regs->pc); | |
402 | #endif | |
403 | ||
404 | return; | |
405 | ||
406 | give_sigsegv: | |
407 | if (sig == SIGSEGV) | |
408 | ka->sa.sa_handler = SIG_DFL; | |
409 | force_sig(SIGSEGV, current); | |
410 | } | |
411 | ||
29c4dfd9 CZ |
412 | /* |
413 | * Atomically swap in the new signal mask, and wait for a signal. | |
414 | */ | |
415 | ||
416 | asmlinkage long xtensa_rt_sigsuspend(sigset_t __user *unewset, | |
417 | size_t sigsetsize, | |
418 | long a2, long a3, long a4, long a5, | |
419 | struct pt_regs *regs) | |
420 | { | |
421 | sigset_t saveset, newset; | |
422 | ||
423 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
424 | if (sigsetsize != sizeof(sigset_t)) | |
425 | return -EINVAL; | |
426 | ||
427 | if (copy_from_user(&newset, unewset, sizeof(newset))) | |
428 | return -EFAULT; | |
429 | ||
430 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
431 | spin_lock_irq(¤t->sighand->siglock); | |
432 | saveset = current->blocked; | |
433 | current->blocked = newset; | |
434 | recalc_sigpending(); | |
435 | spin_unlock_irq(¤t->sighand->siglock); | |
436 | ||
437 | regs->areg[2] = -EINTR; | |
438 | while (1) { | |
439 | current->state = TASK_INTERRUPTIBLE; | |
440 | schedule(); | |
441 | if (do_signal(regs, &saveset)) | |
442 | return -EINTR; | |
443 | } | |
444 | } | |
445 | ||
446 | asmlinkage long xtensa_sigaltstack(const stack_t __user *uss, | |
447 | stack_t __user *uoss, | |
448 | long a2, long a3, long a4, long a5, | |
449 | struct pt_regs *regs) | |
450 | { | |
451 | return do_sigaltstack(uss, uoss, regs->areg[1]); | |
452 | } | |
453 | ||
5a0015d6 CZ |
454 | |
455 | ||
456 | /* | |
457 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
458 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
459 | * mistake. | |
460 | * | |
461 | * Note that we go through the signals twice: once to check the signals that | |
462 | * the kernel can handle, and then we build all the user-level signal handling | |
463 | * stack-frames in one go after that. | |
464 | */ | |
465 | int do_signal(struct pt_regs *regs, sigset_t *oldset) | |
466 | { | |
467 | siginfo_t info; | |
468 | int signr; | |
469 | struct k_sigaction ka; | |
470 | ||
29c4dfd9 CZ |
471 | if (!user_mode(regs)) |
472 | return 0; | |
473 | ||
474 | if (try_to_freeze()) | |
475 | goto no_signal; | |
476 | ||
5a0015d6 CZ |
477 | if (!oldset) |
478 | oldset = ¤t->blocked; | |
479 | ||
29c4dfd9 CZ |
480 | task_pt_regs(current)->icountlevel = 0; |
481 | ||
5a0015d6 CZ |
482 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
483 | ||
29c4dfd9 CZ |
484 | if (signr > 0) { |
485 | ||
486 | /* Are we from a system call? */ | |
487 | ||
488 | if ((signed)regs->syscall >= 0) { | |
5a0015d6 | 489 | |
29c4dfd9 CZ |
490 | /* If so, check system call restarting.. */ |
491 | ||
492 | switch (regs->areg[2]) { | |
493 | case -ERESTARTNOHAND: | |
494 | case -ERESTART_RESTARTBLOCK: | |
5a0015d6 CZ |
495 | regs->areg[2] = -EINTR; |
496 | break; | |
29c4dfd9 CZ |
497 | |
498 | case -ERESTARTSYS: | |
499 | if (!(ka.sa.sa_flags & SA_RESTART)) { | |
500 | regs->areg[2] = -EINTR; | |
501 | break; | |
502 | } | |
503 | /* fallthrough */ | |
504 | case -ERESTARTNOINTR: | |
505 | regs->areg[2] = regs->syscall; | |
506 | regs->pc -= 3; | |
507 | break; | |
508 | ||
509 | default: | |
510 | /* nothing to do */ | |
511 | if (regs->areg[2] != 0) | |
512 | break; | |
513 | } | |
5a0015d6 | 514 | } |
5a0015d6 | 515 | |
29c4dfd9 CZ |
516 | /* Whee! Actually deliver the signal. */ |
517 | /* Set up the stack frame */ | |
518 | setup_frame(signr, &ka, &info, oldset, regs); | |
5a0015d6 | 519 | |
29c4dfd9 CZ |
520 | if (ka.sa.sa_flags & SA_ONESHOT) |
521 | ka.sa.sa_handler = SIG_DFL; | |
5a0015d6 | 522 | |
29c4dfd9 CZ |
523 | spin_lock_irq(¤t->sighand->siglock); |
524 | sigorsets(¤t->blocked, ¤t->blocked, &ka.sa.sa_mask); | |
525 | if (!(ka.sa.sa_flags & SA_NODEFER)) | |
526 | sigaddset(¤t->blocked, signr); | |
527 | recalc_sigpending(); | |
528 | spin_unlock_irq(¤t->sighand->siglock); | |
529 | if (current->ptrace & PT_SINGLESTEP) | |
530 | task_pt_regs(current)->icountlevel = 1; | |
5a0015d6 | 531 | |
29c4dfd9 CZ |
532 | return 1; |
533 | } | |
5a0015d6 | 534 | |
29c4dfd9 CZ |
535 | no_signal: |
536 | /* Did we come from a system call? */ | |
537 | if ((signed) regs->syscall >= 0) { | |
538 | /* Restart the system call - no handlers present */ | |
539 | switch (regs->areg[2]) { | |
540 | case -ERESTARTNOHAND: | |
541 | case -ERESTARTSYS: | |
542 | case -ERESTARTNOINTR: | |
543 | regs->areg[2] = regs->syscall; | |
544 | regs->pc -= 3; | |
545 | break; | |
546 | case -ERESTART_RESTARTBLOCK: | |
547 | regs->areg[2] = __NR_restart_syscall; | |
548 | regs->pc -= 3; | |
549 | break; | |
550 | } | |
551 | } | |
552 | if (current->ptrace & PT_SINGLESTEP) | |
553 | task_pt_regs(current)->icountlevel = 1; | |
554 | return 0; | |
5a0015d6 | 555 | } |
29c4dfd9 | 556 |