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 | 22 | #include <linux/freezer.h> |
a53bb24e | 23 | #include <linux/tracehook.h> |
29c4dfd9 | 24 | |
5a0015d6 CZ |
25 | #include <asm/ucontext.h> |
26 | #include <asm/uaccess.h> | |
5a0015d6 | 27 | #include <asm/cacheflush.h> |
29c4dfd9 CZ |
28 | #include <asm/coprocessor.h> |
29 | #include <asm/unistd.h> | |
5a0015d6 CZ |
30 | |
31 | #define DEBUG_SIG 0 | |
32 | ||
33 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
34 | ||
5a0015d6 CZ |
35 | extern struct task_struct *coproc_owners[]; |
36 | ||
29c4dfd9 CZ |
37 | struct rt_sigframe |
38 | { | |
39 | struct siginfo info; | |
40 | struct ucontext uc; | |
c658eac6 CZ |
41 | struct { |
42 | xtregs_opt_t opt; | |
43 | xtregs_user_t user; | |
44 | #if XTENSA_HAVE_COPROCESSORS | |
45 | xtregs_coprocessor_t cp; | |
46 | #endif | |
47 | } xtregs; | |
29c4dfd9 CZ |
48 | unsigned char retcode[6]; |
49 | unsigned int window[4]; | |
50 | }; | |
51 | ||
52 | /* | |
53 | * Flush register windows stored in pt_regs to stack. | |
54 | * Returns 1 for errors. | |
5a0015d6 CZ |
55 | */ |
56 | ||
29c4dfd9 CZ |
57 | int |
58 | flush_window_regs_user(struct pt_regs *regs) | |
5a0015d6 | 59 | { |
29c4dfd9 CZ |
60 | const unsigned long ws = regs->windowstart; |
61 | const unsigned long wb = regs->windowbase; | |
62 | unsigned long sp = 0; | |
63 | unsigned long wm; | |
64 | int err = 1; | |
65 | int base; | |
5a0015d6 | 66 | |
29c4dfd9 | 67 | /* Return if no other frames. */ |
5a0015d6 | 68 | |
29c4dfd9 CZ |
69 | if (regs->wmask == 1) |
70 | return 0; | |
5a0015d6 | 71 | |
29c4dfd9 | 72 | /* Rotate windowmask and skip empty frames. */ |
5a0015d6 | 73 | |
29c4dfd9 CZ |
74 | wm = (ws >> wb) | (ws << (XCHAL_NUM_AREGS / 4 - wb)); |
75 | base = (XCHAL_NUM_AREGS / 4) - (regs->wmask >> 4); | |
76 | ||
77 | /* For call8 or call12 frames, we need the previous stack pointer. */ | |
5a0015d6 | 78 | |
29c4dfd9 CZ |
79 | if ((regs->wmask & 2) == 0) |
80 | if (__get_user(sp, (int*)(regs->areg[base * 4 + 1] - 12))) | |
81 | goto errout; | |
5a0015d6 | 82 | |
29c4dfd9 | 83 | /* Spill frames to stack. */ |
5a0015d6 | 84 | |
29c4dfd9 | 85 | while (base < XCHAL_NUM_AREGS / 4) { |
5a0015d6 | 86 | |
29c4dfd9 CZ |
87 | int m = (wm >> base); |
88 | int inc = 0; | |
5a0015d6 | 89 | |
29c4dfd9 | 90 | /* Save registers a4..a7 (call8) or a4...a11 (call12) */ |
5a0015d6 | 91 | |
29c4dfd9 CZ |
92 | if (m & 2) { /* call4 */ |
93 | inc = 1; | |
5a0015d6 | 94 | |
29c4dfd9 CZ |
95 | } else if (m & 4) { /* call8 */ |
96 | if (copy_to_user((void*)(sp - 32), | |
97 | ®s->areg[(base + 1) * 4], 16)) | |
98 | goto errout; | |
99 | inc = 2; | |
5a0015d6 | 100 | |
29c4dfd9 CZ |
101 | } else if (m & 8) { /* call12 */ |
102 | if (copy_to_user((void*)(sp - 48), | |
103 | ®s->areg[(base + 1) * 4], 32)) | |
104 | goto errout; | |
105 | inc = 3; | |
106 | } | |
5a0015d6 | 107 | |
29c4dfd9 | 108 | /* Save current frame a0..a3 under next SP */ |
5a0015d6 | 109 | |
29c4dfd9 CZ |
110 | sp = regs->areg[((base + inc) * 4 + 1) % XCHAL_NUM_AREGS]; |
111 | if (copy_to_user((void*)(sp - 16), ®s->areg[base * 4], 16)) | |
112 | goto errout; | |
113 | ||
114 | /* Get current stack pointer for next loop iteration. */ | |
115 | ||
116 | sp = regs->areg[base * 4 + 1]; | |
117 | base += inc; | |
118 | } | |
119 | ||
3befce8f CZ |
120 | regs->wmask = 1; |
121 | regs->windowstart = 1 << wb; | |
122 | ||
29c4dfd9 | 123 | return 0; |
5a0015d6 | 124 | |
29c4dfd9 CZ |
125 | errout: |
126 | return err; | |
127 | } | |
5a0015d6 CZ |
128 | |
129 | /* | |
29c4dfd9 CZ |
130 | * Note: We don't copy double exception 'regs', we have to finish double exc. |
131 | * first before we return to signal handler! This dbl.exc.handler might cause | |
132 | * another double exception, but I think we are fine as the situation is the | |
133 | * same as if we had returned to the signal handerl and got an interrupt | |
134 | * immediately... | |
5a0015d6 CZ |
135 | */ |
136 | ||
29c4dfd9 | 137 | static int |
c658eac6 | 138 | setup_sigcontext(struct rt_sigframe __user *frame, struct pt_regs *regs) |
5a0015d6 | 139 | { |
c658eac6 CZ |
140 | struct sigcontext __user *sc = &frame->uc.uc_mcontext; |
141 | struct thread_info *ti = current_thread_info(); | |
29c4dfd9 | 142 | int err = 0; |
5a0015d6 | 143 | |
29c4dfd9 CZ |
144 | #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) |
145 | COPY(pc); | |
146 | COPY(ps); | |
147 | COPY(lbeg); | |
148 | COPY(lend); | |
149 | COPY(lcount); | |
150 | COPY(sar); | |
151 | #undef COPY | |
5a0015d6 | 152 | |
29c4dfd9 CZ |
153 | err |= flush_window_regs_user(regs); |
154 | err |= __copy_to_user (sc->sc_a, regs->areg, 16 * 4); | |
c658eac6 | 155 | err |= __put_user(0, &sc->sc_xtregs); |
5a0015d6 | 156 | |
c658eac6 CZ |
157 | if (err) |
158 | return err; | |
5a0015d6 | 159 | |
c658eac6 CZ |
160 | #if XTENSA_HAVE_COPROCESSORS |
161 | coprocessor_flush_all(ti); | |
162 | coprocessor_release_all(ti); | |
163 | err |= __copy_to_user(&frame->xtregs.cp, &ti->xtregs_cp, | |
164 | sizeof (frame->xtregs.cp)); | |
5a0015d6 | 165 | #endif |
c658eac6 CZ |
166 | err |= __copy_to_user(&frame->xtregs.opt, ®s->xtregs_opt, |
167 | sizeof (xtregs_opt_t)); | |
168 | err |= __copy_to_user(&frame->xtregs.user, &ti->xtregs_user, | |
169 | sizeof (xtregs_user_t)); | |
170 | ||
171 | err |= __put_user(err ? NULL : &frame->xtregs, &sc->sc_xtregs); | |
5a0015d6 | 172 | |
29c4dfd9 CZ |
173 | return err; |
174 | } | |
5a0015d6 CZ |
175 | |
176 | static int | |
c658eac6 | 177 | restore_sigcontext(struct pt_regs *regs, struct rt_sigframe __user *frame) |
5a0015d6 | 178 | { |
c658eac6 CZ |
179 | struct sigcontext __user *sc = &frame->uc.uc_mcontext; |
180 | struct thread_info *ti = current_thread_info(); | |
5a0015d6 CZ |
181 | unsigned int err = 0; |
182 | unsigned long ps; | |
5a0015d6 CZ |
183 | |
184 | #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) | |
185 | COPY(pc); | |
5a0015d6 CZ |
186 | COPY(lbeg); |
187 | COPY(lend); | |
188 | COPY(lcount); | |
189 | COPY(sar); | |
5a0015d6 CZ |
190 | #undef COPY |
191 | ||
29c4dfd9 CZ |
192 | /* All registers were flushed to stack. Start with a prestine frame. */ |
193 | ||
194 | regs->wmask = 1; | |
195 | regs->windowbase = 0; | |
196 | regs->windowstart = 1; | |
197 | ||
c658eac6 CZ |
198 | regs->syscall = -1; /* disable syscall checks */ |
199 | ||
5a0015d6 CZ |
200 | /* For PS, restore only PS.CALLINC. |
201 | * Assume that all other bits are either the same as for the signal | |
202 | * handler, or the user mode value doesn't matter (e.g. PS.OWB). | |
203 | */ | |
204 | err |= __get_user(ps, &sc->sc_ps); | |
29c4dfd9 | 205 | regs->ps = (regs->ps & ~PS_CALLINC_MASK) | (ps & PS_CALLINC_MASK); |
5a0015d6 CZ |
206 | |
207 | /* Additional corruption checks */ | |
208 | ||
5a0015d6 | 209 | if ((regs->lcount > 0) |
29c4dfd9 | 210 | && ((regs->lbeg > TASK_SIZE) || (regs->lend > TASK_SIZE)) ) |
5a0015d6 CZ |
211 | err = 1; |
212 | ||
29c4dfd9 | 213 | err |= __copy_from_user(regs->areg, sc->sc_a, 16 * 4); |
5a0015d6 | 214 | |
c658eac6 CZ |
215 | if (err) |
216 | return err; | |
217 | ||
29c4dfd9 CZ |
218 | /* The signal handler may have used coprocessors in which |
219 | * case they are still enabled. We disable them to force a | |
220 | * reloading of the original task's CP state by the lazy | |
221 | * context-switching mechanisms of CP exception handling. | |
222 | * Also, we essentially discard any coprocessor state that the | |
223 | * signal handler created. */ | |
5a0015d6 | 224 | |
c658eac6 CZ |
225 | #if XTENSA_HAVE_COPROCESSORS |
226 | coprocessor_release_all(ti); | |
227 | err |= __copy_from_user(&ti->xtregs_cp, &frame->xtregs.cp, | |
228 | sizeof (frame->xtregs.cp)); | |
5a0015d6 | 229 | #endif |
c658eac6 CZ |
230 | err |= __copy_from_user(&ti->xtregs_user, &frame->xtregs.user, |
231 | sizeof (xtregs_user_t)); | |
232 | err |= __copy_from_user(®s->xtregs_opt, &frame->xtregs.opt, | |
233 | sizeof (xtregs_opt_t)); | |
5a0015d6 CZ |
234 | |
235 | return err; | |
236 | } | |
237 | ||
5a0015d6 | 238 | |
29c4dfd9 CZ |
239 | /* |
240 | * Do a signal return; undo the signal stack. | |
241 | */ | |
5a0015d6 | 242 | |
29c4dfd9 CZ |
243 | asmlinkage long xtensa_rt_sigreturn(long a0, long a1, long a2, long a3, |
244 | long a4, long a5, struct pt_regs *regs) | |
5a0015d6 | 245 | { |
29c4dfd9 | 246 | struct rt_sigframe __user *frame; |
5a0015d6 | 247 | sigset_t set; |
5a0015d6 | 248 | int ret; |
29c4dfd9 | 249 | |
188f677f AV |
250 | /* Always make any pending restarted system calls return -EINTR */ |
251 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
252 | ||
5a0015d6 | 253 | if (regs->depc > 64) |
29c4dfd9 CZ |
254 | panic("rt_sigreturn in double exception!\n"); |
255 | ||
256 | frame = (struct rt_sigframe __user *) regs->areg[1]; | |
5a0015d6 | 257 | |
b9e122c8 | 258 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
5a0015d6 CZ |
259 | goto badframe; |
260 | ||
261 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
262 | goto badframe; | |
263 | ||
264 | sigdelsetmask(&set, ~_BLOCKABLE); | |
d12f7c4a | 265 | set_current_blocked(&set); |
5a0015d6 | 266 | |
c658eac6 | 267 | if (restore_sigcontext(regs, frame)) |
5a0015d6 | 268 | goto badframe; |
29c4dfd9 | 269 | |
5a0015d6 CZ |
270 | ret = regs->areg[2]; |
271 | ||
29c4dfd9 | 272 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->areg[1]) == -EFAULT) |
5a0015d6 | 273 | goto badframe; |
5a0015d6 CZ |
274 | |
275 | return ret; | |
276 | ||
277 | badframe: | |
278 | force_sig(SIGSEGV, current); | |
279 | return 0; | |
280 | } | |
281 | ||
29c4dfd9 | 282 | |
5a0015d6 CZ |
283 | |
284 | /* | |
29c4dfd9 | 285 | * Set up a signal frame. |
5a0015d6 | 286 | */ |
5a0015d6 CZ |
287 | |
288 | static int | |
29c4dfd9 | 289 | gen_return_code(unsigned char *codemem) |
5a0015d6 | 290 | { |
5a0015d6 CZ |
291 | int err = 0; |
292 | ||
29c4dfd9 CZ |
293 | /* |
294 | * The 12-bit immediate is really split up within the 24-bit MOVI | |
295 | * instruction. As long as the above system call numbers fit within | |
296 | * 8-bits, the following code works fine. See the Xtensa ISA for | |
297 | * details. | |
5a0015d6 | 298 | */ |
5a0015d6 | 299 | |
29c4dfd9 CZ |
300 | #if __NR_rt_sigreturn > 255 |
301 | # error Generating the MOVI instruction below breaks! | |
5a0015d6 CZ |
302 | #endif |
303 | ||
5a0015d6 | 304 | #ifdef __XTENSA_EB__ /* Big Endian version */ |
29c4dfd9 CZ |
305 | /* Generate instruction: MOVI a2, __NR_rt_sigreturn */ |
306 | err |= __put_user(0x22, &codemem[0]); | |
307 | err |= __put_user(0x0a, &codemem[1]); | |
308 | err |= __put_user(__NR_rt_sigreturn, &codemem[2]); | |
309 | /* Generate instruction: SYSCALL */ | |
310 | err |= __put_user(0x00, &codemem[3]); | |
311 | err |= __put_user(0x05, &codemem[4]); | |
312 | err |= __put_user(0x00, &codemem[5]); | |
5a0015d6 CZ |
313 | |
314 | #elif defined __XTENSA_EL__ /* Little Endian version */ | |
29c4dfd9 CZ |
315 | /* Generate instruction: MOVI a2, __NR_rt_sigreturn */ |
316 | err |= __put_user(0x22, &codemem[0]); | |
317 | err |= __put_user(0xa0, &codemem[1]); | |
318 | err |= __put_user(__NR_rt_sigreturn, &codemem[2]); | |
319 | /* Generate instruction: SYSCALL */ | |
320 | err |= __put_user(0x00, &codemem[3]); | |
321 | err |= __put_user(0x50, &codemem[4]); | |
322 | err |= __put_user(0x00, &codemem[5]); | |
5a0015d6 | 323 | #else |
29c4dfd9 | 324 | # error Must use compiler for Xtensa processors. |
5a0015d6 | 325 | #endif |
5a0015d6 CZ |
326 | |
327 | /* Flush generated code out of the data cache */ | |
328 | ||
173d6681 CZ |
329 | if (err == 0) { |
330 | __invalidate_icache_range((unsigned long)codemem, 6UL); | |
331 | __flush_invalidate_dcache_range((unsigned long)codemem, 6UL); | |
332 | } | |
5a0015d6 CZ |
333 | |
334 | return err; | |
335 | } | |
336 | ||
5a0015d6 | 337 | |
3785006a MF |
338 | static int setup_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
339 | sigset_t *set, struct pt_regs *regs) | |
5a0015d6 | 340 | { |
29c4dfd9 | 341 | struct rt_sigframe *frame; |
5a0015d6 CZ |
342 | int err = 0; |
343 | int signal; | |
29c4dfd9 | 344 | unsigned long sp, ra; |
5a0015d6 | 345 | |
29c4dfd9 | 346 | sp = regs->areg[1]; |
5a0015d6 | 347 | |
29c4dfd9 CZ |
348 | if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! on_sig_stack(sp)) { |
349 | sp = current->sas_ss_sp + current->sas_ss_size; | |
5a0015d6 CZ |
350 | } |
351 | ||
29c4dfd9 | 352 | frame = (void *)((sp - sizeof(*frame)) & -16ul); |
5a0015d6 | 353 | |
5a0015d6 CZ |
354 | if (regs->depc > 64) |
355 | panic ("Double exception sys_sigreturn\n"); | |
356 | ||
29c4dfd9 | 357 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) { |
5a0015d6 | 358 | goto give_sigsegv; |
29c4dfd9 | 359 | } |
5a0015d6 CZ |
360 | |
361 | signal = current_thread_info()->exec_domain | |
362 | && current_thread_info()->exec_domain->signal_invmap | |
363 | && sig < 32 | |
364 | ? current_thread_info()->exec_domain->signal_invmap[sig] | |
365 | : sig; | |
366 | ||
29c4dfd9 CZ |
367 | if (ka->sa.sa_flags & SA_SIGINFO) { |
368 | err |= copy_siginfo_to_user(&frame->info, info); | |
369 | } | |
370 | ||
371 | /* Create the user context. */ | |
5a0015d6 | 372 | |
5a0015d6 CZ |
373 | err |= __put_user(0, &frame->uc.uc_flags); |
374 | err |= __put_user(0, &frame->uc.uc_link); | |
375 | err |= __put_user((void *)current->sas_ss_sp, | |
376 | &frame->uc.uc_stack.ss_sp); | |
377 | err |= __put_user(sas_ss_flags(regs->areg[1]), | |
378 | &frame->uc.uc_stack.ss_flags); | |
379 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
c658eac6 | 380 | err |= setup_sigcontext(frame, regs); |
5a0015d6 CZ |
381 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
382 | ||
44c64e6b CZ |
383 | if (ka->sa.sa_flags & SA_RESTORER) { |
384 | ra = (unsigned long)ka->sa.sa_restorer; | |
385 | } else { | |
5a0015d6 | 386 | |
44c64e6b | 387 | /* Create sys_rt_sigreturn syscall in stack frame */ |
29c4dfd9 | 388 | |
44c64e6b CZ |
389 | err |= gen_return_code(frame->retcode); |
390 | ||
391 | if (err) { | |
392 | goto give_sigsegv; | |
393 | } | |
394 | ra = (unsigned long) frame->retcode; | |
29c4dfd9 | 395 | } |
5a0015d6 | 396 | |
29c4dfd9 CZ |
397 | /* |
398 | * Create signal handler execution context. | |
5a0015d6 CZ |
399 | * Return context not modified until this point. |
400 | */ | |
29c4dfd9 CZ |
401 | |
402 | /* Set up registers for signal handler */ | |
403 | start_thread(regs, (unsigned long) ka->sa.sa_handler, | |
404 | (unsigned long) frame); | |
405 | ||
406 | /* Set up a stack frame for a call4 | |
407 | * Note: PS.CALLINC is set to one by start_thread | |
408 | */ | |
29c4dfd9 CZ |
409 | regs->areg[4] = (((unsigned long) ra) & 0x3fffffff) | 0x40000000; |
410 | regs->areg[6] = (unsigned long) signal; | |
411 | regs->areg[7] = (unsigned long) &frame->info; | |
412 | regs->areg[8] = (unsigned long) &frame->uc; | |
5a0015d6 CZ |
413 | |
414 | /* Set access mode to USER_DS. Nomenclature is outdated, but | |
415 | * functionality is used in uaccess.h | |
416 | */ | |
417 | set_fs(USER_DS); | |
418 | ||
419 | #if DEBUG_SIG | |
420 | printk("SIG rt deliver (%s:%d): signal=%d sp=%p pc=%08x\n", | |
421 | current->comm, current->pid, signal, frame, regs->pc); | |
422 | #endif | |
423 | ||
3785006a | 424 | return 0; |
5a0015d6 CZ |
425 | |
426 | give_sigsegv: | |
fa47ac59 | 427 | force_sigsegv(sig, current); |
3785006a | 428 | return -EFAULT; |
5a0015d6 CZ |
429 | } |
430 | ||
29c4dfd9 CZ |
431 | asmlinkage long xtensa_sigaltstack(const stack_t __user *uss, |
432 | stack_t __user *uoss, | |
433 | long a2, long a3, long a4, long a5, | |
434 | struct pt_regs *regs) | |
435 | { | |
436 | return do_sigaltstack(uss, uoss, regs->areg[1]); | |
437 | } | |
438 | ||
5a0015d6 CZ |
439 | |
440 | ||
441 | /* | |
442 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
443 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
444 | * mistake. | |
445 | * | |
446 | * Note that we go through the signals twice: once to check the signals that | |
447 | * the kernel can handle, and then we build all the user-level signal handling | |
448 | * stack-frames in one go after that. | |
449 | */ | |
a53bb24e | 450 | static void do_signal(struct pt_regs *regs) |
5a0015d6 CZ |
451 | { |
452 | siginfo_t info; | |
453 | int signr; | |
454 | struct k_sigaction ka; | |
455 | ||
29c4dfd9 CZ |
456 | if (try_to_freeze()) |
457 | goto no_signal; | |
458 | ||
29c4dfd9 CZ |
459 | task_pt_regs(current)->icountlevel = 0; |
460 | ||
5a0015d6 CZ |
461 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
462 | ||
29c4dfd9 | 463 | if (signr > 0) { |
9112a6b2 | 464 | int ret; |
29c4dfd9 CZ |
465 | |
466 | /* Are we from a system call? */ | |
467 | ||
468 | if ((signed)regs->syscall >= 0) { | |
5a0015d6 | 469 | |
29c4dfd9 CZ |
470 | /* If so, check system call restarting.. */ |
471 | ||
472 | switch (regs->areg[2]) { | |
473 | case -ERESTARTNOHAND: | |
474 | case -ERESTART_RESTARTBLOCK: | |
5a0015d6 CZ |
475 | regs->areg[2] = -EINTR; |
476 | break; | |
29c4dfd9 CZ |
477 | |
478 | case -ERESTARTSYS: | |
479 | if (!(ka.sa.sa_flags & SA_RESTART)) { | |
480 | regs->areg[2] = -EINTR; | |
481 | break; | |
482 | } | |
483 | /* fallthrough */ | |
484 | case -ERESTARTNOINTR: | |
485 | regs->areg[2] = regs->syscall; | |
486 | regs->pc -= 3; | |
487 | break; | |
488 | ||
489 | default: | |
490 | /* nothing to do */ | |
491 | if (regs->areg[2] != 0) | |
492 | break; | |
493 | } | |
5a0015d6 | 494 | } |
5a0015d6 | 495 | |
29c4dfd9 CZ |
496 | /* Whee! Actually deliver the signal. */ |
497 | /* Set up the stack frame */ | |
b7f9a11a | 498 | ret = setup_frame(signr, &ka, &info, sigmask_to_save(), regs); |
3785006a | 499 | if (ret) |
9ccc9c75 | 500 | return; |
5a0015d6 | 501 | |
9ccc9c75 | 502 | clear_thread_flag(TIF_RESTORE_SIGMASK); |
d12f7c4a | 503 | block_sigmask(&ka, signr); |
29c4dfd9 CZ |
504 | if (current->ptrace & PT_SINGLESTEP) |
505 | task_pt_regs(current)->icountlevel = 1; | |
5a0015d6 | 506 | |
9ccc9c75 | 507 | return; |
29c4dfd9 | 508 | } |
5a0015d6 | 509 | |
29c4dfd9 CZ |
510 | no_signal: |
511 | /* Did we come from a system call? */ | |
512 | if ((signed) regs->syscall >= 0) { | |
513 | /* Restart the system call - no handlers present */ | |
514 | switch (regs->areg[2]) { | |
515 | case -ERESTARTNOHAND: | |
516 | case -ERESTARTSYS: | |
517 | case -ERESTARTNOINTR: | |
518 | regs->areg[2] = regs->syscall; | |
519 | regs->pc -= 3; | |
520 | break; | |
521 | case -ERESTART_RESTARTBLOCK: | |
522 | regs->areg[2] = __NR_restart_syscall; | |
523 | regs->pc -= 3; | |
524 | break; | |
525 | } | |
526 | } | |
9ccc9c75 AV |
527 | |
528 | /* If there's no signal to deliver, we just restore the saved mask. */ | |
51a7b448 | 529 | restore_saved_sigmask(); |
9ccc9c75 | 530 | |
29c4dfd9 CZ |
531 | if (current->ptrace & PT_SINGLESTEP) |
532 | task_pt_regs(current)->icountlevel = 1; | |
9ccc9c75 | 533 | return; |
5a0015d6 | 534 | } |
29c4dfd9 | 535 | |
a53bb24e AV |
536 | void do_notify_resume(struct pt_regs *regs) |
537 | { | |
538 | if (!user_mode(regs)) | |
539 | return; | |
540 | ||
541 | if (test_thread_flag(TIF_SIGPENDING)) | |
542 | do_signal(regs); | |
543 | ||
a42c6ded | 544 | if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) |
a53bb24e | 545 | tracehook_notify_resume(regs); |
a53bb24e | 546 | } |