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Commit | Line | Data |
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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> |
a53bb24e | 22 | #include <linux/tracehook.h> |
29c4dfd9 | 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 | ||
5a0015d6 CZ |
32 | extern struct task_struct *coproc_owners[]; |
33 | ||
29c4dfd9 CZ |
34 | struct rt_sigframe |
35 | { | |
36 | struct siginfo info; | |
37 | struct ucontext uc; | |
c658eac6 CZ |
38 | struct { |
39 | xtregs_opt_t opt; | |
40 | xtregs_user_t user; | |
41 | #if XTENSA_HAVE_COPROCESSORS | |
42 | xtregs_coprocessor_t cp; | |
43 | #endif | |
44 | } xtregs; | |
29c4dfd9 CZ |
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. | |
5a0015d6 CZ |
52 | */ |
53 | ||
29c4dfd9 CZ |
54 | int |
55 | flush_window_regs_user(struct pt_regs *regs) | |
5a0015d6 | 56 | { |
29c4dfd9 CZ |
57 | const unsigned long ws = regs->windowstart; |
58 | const unsigned long wb = regs->windowbase; | |
59 | unsigned long sp = 0; | |
60 | unsigned long wm; | |
61 | int err = 1; | |
62 | int base; | |
5a0015d6 | 63 | |
29c4dfd9 | 64 | /* Return if no other frames. */ |
5a0015d6 | 65 | |
29c4dfd9 CZ |
66 | if (regs->wmask == 1) |
67 | return 0; | |
5a0015d6 | 68 | |
29c4dfd9 | 69 | /* Rotate windowmask and skip empty frames. */ |
5a0015d6 | 70 | |
29c4dfd9 CZ |
71 | wm = (ws >> wb) | (ws << (XCHAL_NUM_AREGS / 4 - wb)); |
72 | base = (XCHAL_NUM_AREGS / 4) - (regs->wmask >> 4); | |
73 | ||
74 | /* For call8 or call12 frames, we need the previous stack pointer. */ | |
5a0015d6 | 75 | |
29c4dfd9 CZ |
76 | if ((regs->wmask & 2) == 0) |
77 | if (__get_user(sp, (int*)(regs->areg[base * 4 + 1] - 12))) | |
78 | goto errout; | |
5a0015d6 | 79 | |
29c4dfd9 | 80 | /* Spill frames to stack. */ |
5a0015d6 | 81 | |
29c4dfd9 | 82 | while (base < XCHAL_NUM_AREGS / 4) { |
5a0015d6 | 83 | |
29c4dfd9 CZ |
84 | int m = (wm >> base); |
85 | int inc = 0; | |
5a0015d6 | 86 | |
29c4dfd9 | 87 | /* Save registers a4..a7 (call8) or a4...a11 (call12) */ |
5a0015d6 | 88 | |
29c4dfd9 CZ |
89 | if (m & 2) { /* call4 */ |
90 | inc = 1; | |
5a0015d6 | 91 | |
29c4dfd9 CZ |
92 | } else if (m & 4) { /* call8 */ |
93 | if (copy_to_user((void*)(sp - 32), | |
94 | ®s->areg[(base + 1) * 4], 16)) | |
95 | goto errout; | |
96 | inc = 2; | |
5a0015d6 | 97 | |
29c4dfd9 CZ |
98 | } else if (m & 8) { /* call12 */ |
99 | if (copy_to_user((void*)(sp - 48), | |
100 | ®s->areg[(base + 1) * 4], 32)) | |
101 | goto errout; | |
102 | inc = 3; | |
103 | } | |
5a0015d6 | 104 | |
29c4dfd9 | 105 | /* Save current frame a0..a3 under next SP */ |
5a0015d6 | 106 | |
29c4dfd9 CZ |
107 | sp = regs->areg[((base + inc) * 4 + 1) % XCHAL_NUM_AREGS]; |
108 | if (copy_to_user((void*)(sp - 16), ®s->areg[base * 4], 16)) | |
109 | goto errout; | |
110 | ||
111 | /* Get current stack pointer for next loop iteration. */ | |
112 | ||
113 | sp = regs->areg[base * 4 + 1]; | |
114 | base += inc; | |
115 | } | |
116 | ||
3befce8f CZ |
117 | regs->wmask = 1; |
118 | regs->windowstart = 1 << wb; | |
119 | ||
29c4dfd9 | 120 | return 0; |
5a0015d6 | 121 | |
29c4dfd9 CZ |
122 | errout: |
123 | return err; | |
124 | } | |
5a0015d6 CZ |
125 | |
126 | /* | |
29c4dfd9 CZ |
127 | * Note: We don't copy double exception 'regs', we have to finish double exc. |
128 | * first before we return to signal handler! This dbl.exc.handler might cause | |
129 | * another double exception, but I think we are fine as the situation is the | |
130 | * same as if we had returned to the signal handerl and got an interrupt | |
131 | * immediately... | |
5a0015d6 CZ |
132 | */ |
133 | ||
29c4dfd9 | 134 | static int |
c658eac6 | 135 | setup_sigcontext(struct rt_sigframe __user *frame, struct pt_regs *regs) |
5a0015d6 | 136 | { |
c658eac6 CZ |
137 | struct sigcontext __user *sc = &frame->uc.uc_mcontext; |
138 | struct thread_info *ti = current_thread_info(); | |
29c4dfd9 | 139 | int err = 0; |
5a0015d6 | 140 | |
29c4dfd9 CZ |
141 | #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) |
142 | COPY(pc); | |
143 | COPY(ps); | |
144 | COPY(lbeg); | |
145 | COPY(lend); | |
146 | COPY(lcount); | |
147 | COPY(sar); | |
148 | #undef COPY | |
5a0015d6 | 149 | |
29c4dfd9 CZ |
150 | err |= flush_window_regs_user(regs); |
151 | err |= __copy_to_user (sc->sc_a, regs->areg, 16 * 4); | |
c658eac6 | 152 | err |= __put_user(0, &sc->sc_xtregs); |
5a0015d6 | 153 | |
c658eac6 CZ |
154 | if (err) |
155 | return err; | |
5a0015d6 | 156 | |
c658eac6 CZ |
157 | #if XTENSA_HAVE_COPROCESSORS |
158 | coprocessor_flush_all(ti); | |
159 | coprocessor_release_all(ti); | |
160 | err |= __copy_to_user(&frame->xtregs.cp, &ti->xtregs_cp, | |
161 | sizeof (frame->xtregs.cp)); | |
5a0015d6 | 162 | #endif |
c658eac6 CZ |
163 | err |= __copy_to_user(&frame->xtregs.opt, ®s->xtregs_opt, |
164 | sizeof (xtregs_opt_t)); | |
165 | err |= __copy_to_user(&frame->xtregs.user, &ti->xtregs_user, | |
166 | sizeof (xtregs_user_t)); | |
167 | ||
168 | err |= __put_user(err ? NULL : &frame->xtregs, &sc->sc_xtregs); | |
5a0015d6 | 169 | |
29c4dfd9 CZ |
170 | return err; |
171 | } | |
5a0015d6 CZ |
172 | |
173 | static int | |
c658eac6 | 174 | restore_sigcontext(struct pt_regs *regs, struct rt_sigframe __user *frame) |
5a0015d6 | 175 | { |
c658eac6 CZ |
176 | struct sigcontext __user *sc = &frame->uc.uc_mcontext; |
177 | struct thread_info *ti = current_thread_info(); | |
5a0015d6 CZ |
178 | unsigned int err = 0; |
179 | unsigned long ps; | |
5a0015d6 CZ |
180 | |
181 | #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) | |
182 | COPY(pc); | |
5a0015d6 CZ |
183 | COPY(lbeg); |
184 | COPY(lend); | |
185 | COPY(lcount); | |
186 | COPY(sar); | |
5a0015d6 CZ |
187 | #undef COPY |
188 | ||
29c4dfd9 CZ |
189 | /* All registers were flushed to stack. Start with a prestine frame. */ |
190 | ||
191 | regs->wmask = 1; | |
192 | regs->windowbase = 0; | |
193 | regs->windowstart = 1; | |
194 | ||
c658eac6 CZ |
195 | regs->syscall = -1; /* disable syscall checks */ |
196 | ||
5a0015d6 CZ |
197 | /* For PS, restore only PS.CALLINC. |
198 | * Assume that all other bits are either the same as for the signal | |
199 | * handler, or the user mode value doesn't matter (e.g. PS.OWB). | |
200 | */ | |
201 | err |= __get_user(ps, &sc->sc_ps); | |
29c4dfd9 | 202 | regs->ps = (regs->ps & ~PS_CALLINC_MASK) | (ps & PS_CALLINC_MASK); |
5a0015d6 CZ |
203 | |
204 | /* Additional corruption checks */ | |
205 | ||
5a0015d6 | 206 | if ((regs->lcount > 0) |
29c4dfd9 | 207 | && ((regs->lbeg > TASK_SIZE) || (regs->lend > TASK_SIZE)) ) |
5a0015d6 CZ |
208 | err = 1; |
209 | ||
29c4dfd9 | 210 | err |= __copy_from_user(regs->areg, sc->sc_a, 16 * 4); |
5a0015d6 | 211 | |
c658eac6 CZ |
212 | if (err) |
213 | return err; | |
214 | ||
c4c4594b | 215 | /* The signal handler may have used coprocessors in which |
29c4dfd9 CZ |
216 | * case they are still enabled. We disable them to force a |
217 | * reloading of the original task's CP state by the lazy | |
218 | * context-switching mechanisms of CP exception handling. | |
219 | * Also, we essentially discard any coprocessor state that the | |
220 | * signal handler created. */ | |
5a0015d6 | 221 | |
c658eac6 CZ |
222 | #if XTENSA_HAVE_COPROCESSORS |
223 | coprocessor_release_all(ti); | |
224 | err |= __copy_from_user(&ti->xtregs_cp, &frame->xtregs.cp, | |
225 | sizeof (frame->xtregs.cp)); | |
5a0015d6 | 226 | #endif |
c658eac6 CZ |
227 | err |= __copy_from_user(&ti->xtregs_user, &frame->xtregs.user, |
228 | sizeof (xtregs_user_t)); | |
229 | err |= __copy_from_user(®s->xtregs_opt, &frame->xtregs.opt, | |
230 | sizeof (xtregs_opt_t)); | |
5a0015d6 CZ |
231 | |
232 | return err; | |
233 | } | |
234 | ||
5a0015d6 | 235 | |
29c4dfd9 CZ |
236 | /* |
237 | * Do a signal return; undo the signal stack. | |
238 | */ | |
5a0015d6 | 239 | |
29c4dfd9 CZ |
240 | asmlinkage long xtensa_rt_sigreturn(long a0, long a1, long a2, long a3, |
241 | long a4, long a5, struct pt_regs *regs) | |
5a0015d6 | 242 | { |
29c4dfd9 | 243 | struct rt_sigframe __user *frame; |
5a0015d6 | 244 | sigset_t set; |
5a0015d6 | 245 | int ret; |
29c4dfd9 | 246 | |
188f677f AV |
247 | /* Always make any pending restarted system calls return -EINTR */ |
248 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
249 | ||
5a0015d6 | 250 | if (regs->depc > 64) |
29c4dfd9 CZ |
251 | panic("rt_sigreturn in double exception!\n"); |
252 | ||
253 | frame = (struct rt_sigframe __user *) regs->areg[1]; | |
5a0015d6 | 254 | |
b9e122c8 | 255 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
5a0015d6 CZ |
256 | goto badframe; |
257 | ||
258 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
259 | goto badframe; | |
260 | ||
d12f7c4a | 261 | set_current_blocked(&set); |
5a0015d6 | 262 | |
c658eac6 | 263 | if (restore_sigcontext(regs, frame)) |
5a0015d6 | 264 | goto badframe; |
29c4dfd9 | 265 | |
5a0015d6 CZ |
266 | ret = regs->areg[2]; |
267 | ||
29c4dfd9 | 268 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->areg[1]) == -EFAULT) |
5a0015d6 | 269 | goto badframe; |
5a0015d6 CZ |
270 | |
271 | return ret; | |
272 | ||
273 | badframe: | |
274 | force_sig(SIGSEGV, current); | |
275 | return 0; | |
276 | } | |
277 | ||
29c4dfd9 | 278 | |
5a0015d6 CZ |
279 | |
280 | /* | |
29c4dfd9 | 281 | * Set up a signal frame. |
5a0015d6 | 282 | */ |
5a0015d6 CZ |
283 | |
284 | static int | |
29c4dfd9 | 285 | gen_return_code(unsigned char *codemem) |
5a0015d6 | 286 | { |
5a0015d6 CZ |
287 | int err = 0; |
288 | ||
29c4dfd9 CZ |
289 | /* |
290 | * The 12-bit immediate is really split up within the 24-bit MOVI | |
291 | * instruction. As long as the above system call numbers fit within | |
292 | * 8-bits, the following code works fine. See the Xtensa ISA for | |
293 | * details. | |
5a0015d6 | 294 | */ |
5a0015d6 | 295 | |
29c4dfd9 CZ |
296 | #if __NR_rt_sigreturn > 255 |
297 | # error Generating the MOVI instruction below breaks! | |
5a0015d6 CZ |
298 | #endif |
299 | ||
5a0015d6 | 300 | #ifdef __XTENSA_EB__ /* Big Endian version */ |
29c4dfd9 CZ |
301 | /* Generate instruction: MOVI a2, __NR_rt_sigreturn */ |
302 | err |= __put_user(0x22, &codemem[0]); | |
303 | err |= __put_user(0x0a, &codemem[1]); | |
304 | err |= __put_user(__NR_rt_sigreturn, &codemem[2]); | |
305 | /* Generate instruction: SYSCALL */ | |
306 | err |= __put_user(0x00, &codemem[3]); | |
307 | err |= __put_user(0x05, &codemem[4]); | |
308 | err |= __put_user(0x00, &codemem[5]); | |
5a0015d6 CZ |
309 | |
310 | #elif defined __XTENSA_EL__ /* Little Endian version */ | |
29c4dfd9 CZ |
311 | /* Generate instruction: MOVI a2, __NR_rt_sigreturn */ |
312 | err |= __put_user(0x22, &codemem[0]); | |
313 | err |= __put_user(0xa0, &codemem[1]); | |
314 | err |= __put_user(__NR_rt_sigreturn, &codemem[2]); | |
315 | /* Generate instruction: SYSCALL */ | |
316 | err |= __put_user(0x00, &codemem[3]); | |
317 | err |= __put_user(0x50, &codemem[4]); | |
318 | err |= __put_user(0x00, &codemem[5]); | |
5a0015d6 | 319 | #else |
29c4dfd9 | 320 | # error Must use compiler for Xtensa processors. |
5a0015d6 | 321 | #endif |
5a0015d6 CZ |
322 | |
323 | /* Flush generated code out of the data cache */ | |
324 | ||
173d6681 CZ |
325 | if (err == 0) { |
326 | __invalidate_icache_range((unsigned long)codemem, 6UL); | |
327 | __flush_invalidate_dcache_range((unsigned long)codemem, 6UL); | |
328 | } | |
5a0015d6 CZ |
329 | |
330 | return err; | |
331 | } | |
332 | ||
5a0015d6 | 333 | |
3785006a MF |
334 | static int setup_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
335 | sigset_t *set, struct pt_regs *regs) | |
5a0015d6 | 336 | { |
29c4dfd9 | 337 | struct rt_sigframe *frame; |
5a0015d6 CZ |
338 | int err = 0; |
339 | int signal; | |
29c4dfd9 | 340 | unsigned long sp, ra; |
5a0015d6 | 341 | |
29c4dfd9 | 342 | sp = regs->areg[1]; |
5a0015d6 | 343 | |
29c4dfd9 CZ |
344 | if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! on_sig_stack(sp)) { |
345 | sp = current->sas_ss_sp + current->sas_ss_size; | |
5a0015d6 CZ |
346 | } |
347 | ||
29c4dfd9 | 348 | frame = (void *)((sp - sizeof(*frame)) & -16ul); |
5a0015d6 | 349 | |
5a0015d6 CZ |
350 | if (regs->depc > 64) |
351 | panic ("Double exception sys_sigreturn\n"); | |
352 | ||
29c4dfd9 | 353 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) { |
5a0015d6 | 354 | goto give_sigsegv; |
29c4dfd9 | 355 | } |
5a0015d6 CZ |
356 | |
357 | signal = current_thread_info()->exec_domain | |
358 | && current_thread_info()->exec_domain->signal_invmap | |
359 | && sig < 32 | |
360 | ? current_thread_info()->exec_domain->signal_invmap[sig] | |
361 | : sig; | |
362 | ||
29c4dfd9 CZ |
363 | if (ka->sa.sa_flags & SA_SIGINFO) { |
364 | err |= copy_siginfo_to_user(&frame->info, info); | |
365 | } | |
366 | ||
367 | /* Create the user context. */ | |
5a0015d6 | 368 | |
5a0015d6 CZ |
369 | err |= __put_user(0, &frame->uc.uc_flags); |
370 | err |= __put_user(0, &frame->uc.uc_link); | |
371 | err |= __put_user((void *)current->sas_ss_sp, | |
372 | &frame->uc.uc_stack.ss_sp); | |
373 | err |= __put_user(sas_ss_flags(regs->areg[1]), | |
374 | &frame->uc.uc_stack.ss_flags); | |
375 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
c658eac6 | 376 | err |= setup_sigcontext(frame, regs); |
5a0015d6 CZ |
377 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
378 | ||
44c64e6b CZ |
379 | if (ka->sa.sa_flags & SA_RESTORER) { |
380 | ra = (unsigned long)ka->sa.sa_restorer; | |
381 | } else { | |
5a0015d6 | 382 | |
44c64e6b | 383 | /* Create sys_rt_sigreturn syscall in stack frame */ |
29c4dfd9 | 384 | |
44c64e6b CZ |
385 | err |= gen_return_code(frame->retcode); |
386 | ||
387 | if (err) { | |
388 | goto give_sigsegv; | |
389 | } | |
390 | ra = (unsigned long) frame->retcode; | |
29c4dfd9 | 391 | } |
5a0015d6 | 392 | |
29c4dfd9 CZ |
393 | /* |
394 | * Create signal handler execution context. | |
5a0015d6 CZ |
395 | * Return context not modified until this point. |
396 | */ | |
29c4dfd9 CZ |
397 | |
398 | /* Set up registers for signal handler */ | |
c4c4594b | 399 | start_thread(regs, (unsigned long) ka->sa.sa_handler, |
29c4dfd9 CZ |
400 | (unsigned long) frame); |
401 | ||
402 | /* Set up a stack frame for a call4 | |
403 | * Note: PS.CALLINC is set to one by start_thread | |
404 | */ | |
29c4dfd9 CZ |
405 | regs->areg[4] = (((unsigned long) ra) & 0x3fffffff) | 0x40000000; |
406 | regs->areg[6] = (unsigned long) signal; | |
407 | regs->areg[7] = (unsigned long) &frame->info; | |
408 | regs->areg[8] = (unsigned long) &frame->uc; | |
5a0015d6 CZ |
409 | |
410 | /* Set access mode to USER_DS. Nomenclature is outdated, but | |
411 | * functionality is used in uaccess.h | |
412 | */ | |
413 | set_fs(USER_DS); | |
414 | ||
415 | #if DEBUG_SIG | |
416 | printk("SIG rt deliver (%s:%d): signal=%d sp=%p pc=%08x\n", | |
417 | current->comm, current->pid, signal, frame, regs->pc); | |
418 | #endif | |
419 | ||
3785006a | 420 | return 0; |
5a0015d6 CZ |
421 | |
422 | give_sigsegv: | |
fa47ac59 | 423 | force_sigsegv(sig, current); |
3785006a | 424 | return -EFAULT; |
5a0015d6 CZ |
425 | } |
426 | ||
c4c4594b | 427 | asmlinkage long xtensa_sigaltstack(const stack_t __user *uss, |
29c4dfd9 | 428 | stack_t __user *uoss, |
c4c4594b | 429 | long a2, long a3, long a4, long a5, |
29c4dfd9 CZ |
430 | struct pt_regs *regs) |
431 | { | |
432 | return do_sigaltstack(uss, uoss, regs->areg[1]); | |
433 | } | |
434 | ||
5a0015d6 CZ |
435 | |
436 | ||
437 | /* | |
438 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
439 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
440 | * mistake. | |
441 | * | |
442 | * Note that we go through the signals twice: once to check the signals that | |
443 | * the kernel can handle, and then we build all the user-level signal handling | |
444 | * stack-frames in one go after that. | |
445 | */ | |
a53bb24e | 446 | static void do_signal(struct pt_regs *regs) |
5a0015d6 CZ |
447 | { |
448 | siginfo_t info; | |
449 | int signr; | |
450 | struct k_sigaction ka; | |
451 | ||
29c4dfd9 CZ |
452 | task_pt_regs(current)->icountlevel = 0; |
453 | ||
5a0015d6 CZ |
454 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
455 | ||
29c4dfd9 | 456 | if (signr > 0) { |
9112a6b2 | 457 | int ret; |
29c4dfd9 CZ |
458 | |
459 | /* Are we from a system call? */ | |
460 | ||
461 | if ((signed)regs->syscall >= 0) { | |
5a0015d6 | 462 | |
29c4dfd9 CZ |
463 | /* If so, check system call restarting.. */ |
464 | ||
465 | switch (regs->areg[2]) { | |
466 | case -ERESTARTNOHAND: | |
467 | case -ERESTART_RESTARTBLOCK: | |
5a0015d6 CZ |
468 | regs->areg[2] = -EINTR; |
469 | break; | |
29c4dfd9 CZ |
470 | |
471 | case -ERESTARTSYS: | |
472 | if (!(ka.sa.sa_flags & SA_RESTART)) { | |
473 | regs->areg[2] = -EINTR; | |
474 | break; | |
475 | } | |
476 | /* fallthrough */ | |
477 | case -ERESTARTNOINTR: | |
478 | regs->areg[2] = regs->syscall; | |
479 | regs->pc -= 3; | |
480 | break; | |
481 | ||
482 | default: | |
483 | /* nothing to do */ | |
484 | if (regs->areg[2] != 0) | |
485 | break; | |
486 | } | |
5a0015d6 | 487 | } |
5a0015d6 | 488 | |
29c4dfd9 CZ |
489 | /* Whee! Actually deliver the signal. */ |
490 | /* Set up the stack frame */ | |
b7f9a11a | 491 | ret = setup_frame(signr, &ka, &info, sigmask_to_save(), regs); |
3785006a | 492 | if (ret) |
9ccc9c75 | 493 | return; |
5a0015d6 | 494 | |
03240b27 | 495 | signal_delivered(signr, &info, &ka, regs, 0); |
29c4dfd9 CZ |
496 | if (current->ptrace & PT_SINGLESTEP) |
497 | task_pt_regs(current)->icountlevel = 1; | |
5a0015d6 | 498 | |
9ccc9c75 | 499 | return; |
29c4dfd9 | 500 | } |
5a0015d6 | 501 | |
29c4dfd9 CZ |
502 | /* Did we come from a system call? */ |
503 | if ((signed) regs->syscall >= 0) { | |
504 | /* Restart the system call - no handlers present */ | |
505 | switch (regs->areg[2]) { | |
506 | case -ERESTARTNOHAND: | |
507 | case -ERESTARTSYS: | |
508 | case -ERESTARTNOINTR: | |
509 | regs->areg[2] = regs->syscall; | |
510 | regs->pc -= 3; | |
511 | break; | |
512 | case -ERESTART_RESTARTBLOCK: | |
513 | regs->areg[2] = __NR_restart_syscall; | |
514 | regs->pc -= 3; | |
515 | break; | |
516 | } | |
517 | } | |
9ccc9c75 AV |
518 | |
519 | /* If there's no signal to deliver, we just restore the saved mask. */ | |
51a7b448 | 520 | restore_saved_sigmask(); |
9ccc9c75 | 521 | |
29c4dfd9 CZ |
522 | if (current->ptrace & PT_SINGLESTEP) |
523 | task_pt_regs(current)->icountlevel = 1; | |
9ccc9c75 | 524 | return; |
5a0015d6 | 525 | } |
29c4dfd9 | 526 | |
a53bb24e AV |
527 | void do_notify_resume(struct pt_regs *regs) |
528 | { | |
a53bb24e AV |
529 | if (test_thread_flag(TIF_SIGPENDING)) |
530 | do_signal(regs); | |
531 | ||
a42c6ded | 532 | if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) |
a53bb24e | 533 | tracehook_notify_resume(regs); |
a53bb24e | 534 | } |