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> |
a53bb24e | 22 | #include <linux/tracehook.h> |
68db0cf1 | 23 | #include <linux/sched/task_stack.h> |
29c4dfd9 | 24 | |
5a0015d6 | 25 | #include <asm/ucontext.h> |
7c0f6ba6 | 26 | #include <linux/uaccess.h> |
5a0015d6 | 27 | #include <asm/cacheflush.h> |
29c4dfd9 CZ |
28 | #include <asm/coprocessor.h> |
29 | #include <asm/unistd.h> | |
5a0015d6 | 30 | |
5a0015d6 CZ |
31 | extern struct task_struct *coproc_owners[]; |
32 | ||
29c4dfd9 CZ |
33 | struct rt_sigframe |
34 | { | |
35 | struct siginfo info; | |
36 | struct ucontext uc; | |
c658eac6 CZ |
37 | struct { |
38 | xtregs_opt_t opt; | |
39 | xtregs_user_t user; | |
40 | #if XTENSA_HAVE_COPROCESSORS | |
41 | xtregs_coprocessor_t cp; | |
42 | #endif | |
43 | } xtregs; | |
29c4dfd9 CZ |
44 | unsigned char retcode[6]; |
45 | unsigned int window[4]; | |
46 | }; | |
47 | ||
48 | /* | |
49 | * Flush register windows stored in pt_regs to stack. | |
50 | * Returns 1 for errors. | |
5a0015d6 CZ |
51 | */ |
52 | ||
29c4dfd9 CZ |
53 | int |
54 | flush_window_regs_user(struct pt_regs *regs) | |
5a0015d6 | 55 | { |
29c4dfd9 CZ |
56 | const unsigned long ws = regs->windowstart; |
57 | const unsigned long wb = regs->windowbase; | |
58 | unsigned long sp = 0; | |
59 | unsigned long wm; | |
60 | int err = 1; | |
61 | int base; | |
5a0015d6 | 62 | |
29c4dfd9 | 63 | /* Return if no other frames. */ |
5a0015d6 | 64 | |
29c4dfd9 CZ |
65 | if (regs->wmask == 1) |
66 | return 0; | |
5a0015d6 | 67 | |
29c4dfd9 | 68 | /* Rotate windowmask and skip empty frames. */ |
5a0015d6 | 69 | |
29c4dfd9 CZ |
70 | wm = (ws >> wb) | (ws << (XCHAL_NUM_AREGS / 4 - wb)); |
71 | base = (XCHAL_NUM_AREGS / 4) - (regs->wmask >> 4); | |
72 | ||
73 | /* For call8 or call12 frames, we need the previous stack pointer. */ | |
5a0015d6 | 74 | |
29c4dfd9 CZ |
75 | if ((regs->wmask & 2) == 0) |
76 | if (__get_user(sp, (int*)(regs->areg[base * 4 + 1] - 12))) | |
77 | goto errout; | |
5a0015d6 | 78 | |
29c4dfd9 | 79 | /* Spill frames to stack. */ |
5a0015d6 | 80 | |
29c4dfd9 | 81 | while (base < XCHAL_NUM_AREGS / 4) { |
5a0015d6 | 82 | |
29c4dfd9 CZ |
83 | int m = (wm >> base); |
84 | int inc = 0; | |
5a0015d6 | 85 | |
29c4dfd9 | 86 | /* Save registers a4..a7 (call8) or a4...a11 (call12) */ |
5a0015d6 | 87 | |
29c4dfd9 CZ |
88 | if (m & 2) { /* call4 */ |
89 | inc = 1; | |
5a0015d6 | 90 | |
29c4dfd9 | 91 | } else if (m & 4) { /* call8 */ |
062b1c19 MF |
92 | if (copy_to_user(&SPILL_SLOT_CALL8(sp, 4), |
93 | ®s->areg[(base + 1) * 4], 16)) | |
29c4dfd9 CZ |
94 | goto errout; |
95 | inc = 2; | |
5a0015d6 | 96 | |
29c4dfd9 | 97 | } else if (m & 8) { /* call12 */ |
062b1c19 MF |
98 | if (copy_to_user(&SPILL_SLOT_CALL12(sp, 4), |
99 | ®s->areg[(base + 1) * 4], 32)) | |
29c4dfd9 CZ |
100 | goto errout; |
101 | inc = 3; | |
102 | } | |
5a0015d6 | 103 | |
29c4dfd9 | 104 | /* Save current frame a0..a3 under next SP */ |
5a0015d6 | 105 | |
29c4dfd9 | 106 | sp = regs->areg[((base + inc) * 4 + 1) % XCHAL_NUM_AREGS]; |
062b1c19 | 107 | if (copy_to_user(&SPILL_SLOT(sp, 0), ®s->areg[base * 4], 16)) |
29c4dfd9 CZ |
108 | goto errout; |
109 | ||
110 | /* Get current stack pointer for next loop iteration. */ | |
111 | ||
112 | sp = regs->areg[base * 4 + 1]; | |
113 | base += inc; | |
114 | } | |
115 | ||
3befce8f CZ |
116 | regs->wmask = 1; |
117 | regs->windowstart = 1 << wb; | |
118 | ||
29c4dfd9 | 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 | 133 | static int |
c658eac6 | 134 | setup_sigcontext(struct rt_sigframe __user *frame, struct pt_regs *regs) |
5a0015d6 | 135 | { |
c658eac6 CZ |
136 | struct sigcontext __user *sc = &frame->uc.uc_mcontext; |
137 | struct thread_info *ti = current_thread_info(); | |
29c4dfd9 | 138 | int err = 0; |
5a0015d6 | 139 | |
29c4dfd9 CZ |
140 | #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) |
141 | COPY(pc); | |
142 | COPY(ps); | |
143 | COPY(lbeg); | |
144 | COPY(lend); | |
145 | COPY(lcount); | |
146 | COPY(sar); | |
147 | #undef COPY | |
5a0015d6 | 148 | |
29c4dfd9 CZ |
149 | err |= flush_window_regs_user(regs); |
150 | err |= __copy_to_user (sc->sc_a, regs->areg, 16 * 4); | |
c658eac6 | 151 | err |= __put_user(0, &sc->sc_xtregs); |
5a0015d6 | 152 | |
c658eac6 CZ |
153 | if (err) |
154 | return err; | |
5a0015d6 | 155 | |
c658eac6 CZ |
156 | #if XTENSA_HAVE_COPROCESSORS |
157 | coprocessor_flush_all(ti); | |
158 | coprocessor_release_all(ti); | |
159 | err |= __copy_to_user(&frame->xtregs.cp, &ti->xtregs_cp, | |
160 | sizeof (frame->xtregs.cp)); | |
5a0015d6 | 161 | #endif |
c658eac6 CZ |
162 | err |= __copy_to_user(&frame->xtregs.opt, ®s->xtregs_opt, |
163 | sizeof (xtregs_opt_t)); | |
164 | err |= __copy_to_user(&frame->xtregs.user, &ti->xtregs_user, | |
165 | sizeof (xtregs_user_t)); | |
166 | ||
167 | err |= __put_user(err ? NULL : &frame->xtregs, &sc->sc_xtregs); | |
5a0015d6 | 168 | |
29c4dfd9 CZ |
169 | return err; |
170 | } | |
5a0015d6 CZ |
171 | |
172 | static int | |
c658eac6 | 173 | restore_sigcontext(struct pt_regs *regs, struct rt_sigframe __user *frame) |
5a0015d6 | 174 | { |
c658eac6 CZ |
175 | struct sigcontext __user *sc = &frame->uc.uc_mcontext; |
176 | struct thread_info *ti = current_thread_info(); | |
5a0015d6 CZ |
177 | unsigned int err = 0; |
178 | unsigned long ps; | |
5a0015d6 CZ |
179 | |
180 | #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) | |
181 | COPY(pc); | |
5a0015d6 CZ |
182 | COPY(lbeg); |
183 | COPY(lend); | |
184 | COPY(lcount); | |
185 | COPY(sar); | |
5a0015d6 CZ |
186 | #undef COPY |
187 | ||
29c4dfd9 CZ |
188 | /* All registers were flushed to stack. Start with a prestine frame. */ |
189 | ||
190 | regs->wmask = 1; | |
191 | regs->windowbase = 0; | |
192 | regs->windowstart = 1; | |
193 | ||
c658eac6 CZ |
194 | regs->syscall = -1; /* disable syscall checks */ |
195 | ||
5a0015d6 CZ |
196 | /* For PS, restore only PS.CALLINC. |
197 | * Assume that all other bits are either the same as for the signal | |
198 | * handler, or the user mode value doesn't matter (e.g. PS.OWB). | |
199 | */ | |
200 | err |= __get_user(ps, &sc->sc_ps); | |
29c4dfd9 | 201 | regs->ps = (regs->ps & ~PS_CALLINC_MASK) | (ps & PS_CALLINC_MASK); |
5a0015d6 CZ |
202 | |
203 | /* Additional corruption checks */ | |
204 | ||
5a0015d6 | 205 | if ((regs->lcount > 0) |
29c4dfd9 | 206 | && ((regs->lbeg > TASK_SIZE) || (regs->lend > TASK_SIZE)) ) |
5a0015d6 CZ |
207 | err = 1; |
208 | ||
29c4dfd9 | 209 | err |= __copy_from_user(regs->areg, sc->sc_a, 16 * 4); |
5a0015d6 | 210 | |
c658eac6 CZ |
211 | if (err) |
212 | return err; | |
213 | ||
c4c4594b | 214 | /* The signal handler may have used coprocessors in which |
29c4dfd9 CZ |
215 | * case they are still enabled. We disable them to force a |
216 | * reloading of the original task's CP state by the lazy | |
217 | * context-switching mechanisms of CP exception handling. | |
218 | * Also, we essentially discard any coprocessor state that the | |
219 | * signal handler created. */ | |
5a0015d6 | 220 | |
c658eac6 CZ |
221 | #if XTENSA_HAVE_COPROCESSORS |
222 | coprocessor_release_all(ti); | |
223 | err |= __copy_from_user(&ti->xtregs_cp, &frame->xtregs.cp, | |
224 | sizeof (frame->xtregs.cp)); | |
5a0015d6 | 225 | #endif |
c658eac6 CZ |
226 | err |= __copy_from_user(&ti->xtregs_user, &frame->xtregs.user, |
227 | sizeof (xtregs_user_t)); | |
228 | err |= __copy_from_user(®s->xtregs_opt, &frame->xtregs.opt, | |
229 | sizeof (xtregs_opt_t)); | |
5a0015d6 CZ |
230 | |
231 | return err; | |
232 | } | |
233 | ||
5a0015d6 | 234 | |
29c4dfd9 CZ |
235 | /* |
236 | * Do a signal return; undo the signal stack. | |
237 | */ | |
5a0015d6 | 238 | |
29c4dfd9 CZ |
239 | asmlinkage long xtensa_rt_sigreturn(long a0, long a1, long a2, long a3, |
240 | long a4, long a5, struct pt_regs *regs) | |
5a0015d6 | 241 | { |
29c4dfd9 | 242 | struct rt_sigframe __user *frame; |
5a0015d6 | 243 | sigset_t set; |
5a0015d6 | 244 | int ret; |
29c4dfd9 | 245 | |
188f677f | 246 | /* Always make any pending restarted system calls return -EINTR */ |
f56141e3 | 247 | current->restart_block.fn = do_no_restart_syscall; |
188f677f | 248 | |
5a0015d6 | 249 | if (regs->depc > 64) |
29c4dfd9 CZ |
250 | panic("rt_sigreturn in double exception!\n"); |
251 | ||
252 | frame = (struct rt_sigframe __user *) regs->areg[1]; | |
5a0015d6 | 253 | |
b9e122c8 | 254 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
5a0015d6 CZ |
255 | goto badframe; |
256 | ||
257 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
258 | goto badframe; | |
259 | ||
d12f7c4a | 260 | set_current_blocked(&set); |
5a0015d6 | 261 | |
c658eac6 | 262 | if (restore_sigcontext(regs, frame)) |
5a0015d6 | 263 | goto badframe; |
29c4dfd9 | 264 | |
5a0015d6 CZ |
265 | ret = regs->areg[2]; |
266 | ||
0430f2f2 | 267 | if (restore_altstack(&frame->uc.uc_stack)) |
5a0015d6 | 268 | goto badframe; |
5a0015d6 CZ |
269 | |
270 | return ret; | |
271 | ||
272 | badframe: | |
273 | force_sig(SIGSEGV, current); | |
274 | return 0; | |
275 | } | |
276 | ||
29c4dfd9 | 277 | |
5a0015d6 CZ |
278 | |
279 | /* | |
29c4dfd9 | 280 | * Set up a signal frame. |
5a0015d6 | 281 | */ |
5a0015d6 CZ |
282 | |
283 | static int | |
29c4dfd9 | 284 | gen_return_code(unsigned char *codemem) |
5a0015d6 | 285 | { |
5a0015d6 CZ |
286 | int err = 0; |
287 | ||
29c4dfd9 CZ |
288 | /* |
289 | * The 12-bit immediate is really split up within the 24-bit MOVI | |
290 | * instruction. As long as the above system call numbers fit within | |
291 | * 8-bits, the following code works fine. See the Xtensa ISA for | |
292 | * details. | |
5a0015d6 | 293 | */ |
5a0015d6 | 294 | |
29c4dfd9 CZ |
295 | #if __NR_rt_sigreturn > 255 |
296 | # error Generating the MOVI instruction below breaks! | |
5a0015d6 CZ |
297 | #endif |
298 | ||
5a0015d6 | 299 | #ifdef __XTENSA_EB__ /* Big Endian version */ |
29c4dfd9 CZ |
300 | /* Generate instruction: MOVI a2, __NR_rt_sigreturn */ |
301 | err |= __put_user(0x22, &codemem[0]); | |
302 | err |= __put_user(0x0a, &codemem[1]); | |
303 | err |= __put_user(__NR_rt_sigreturn, &codemem[2]); | |
304 | /* Generate instruction: SYSCALL */ | |
305 | err |= __put_user(0x00, &codemem[3]); | |
306 | err |= __put_user(0x05, &codemem[4]); | |
307 | err |= __put_user(0x00, &codemem[5]); | |
5a0015d6 CZ |
308 | |
309 | #elif defined __XTENSA_EL__ /* Little Endian version */ | |
29c4dfd9 CZ |
310 | /* Generate instruction: MOVI a2, __NR_rt_sigreturn */ |
311 | err |= __put_user(0x22, &codemem[0]); | |
312 | err |= __put_user(0xa0, &codemem[1]); | |
313 | err |= __put_user(__NR_rt_sigreturn, &codemem[2]); | |
314 | /* Generate instruction: SYSCALL */ | |
315 | err |= __put_user(0x00, &codemem[3]); | |
316 | err |= __put_user(0x50, &codemem[4]); | |
317 | err |= __put_user(0x00, &codemem[5]); | |
5a0015d6 | 318 | #else |
29c4dfd9 | 319 | # error Must use compiler for Xtensa processors. |
5a0015d6 | 320 | #endif |
5a0015d6 CZ |
321 | |
322 | /* Flush generated code out of the data cache */ | |
323 | ||
173d6681 CZ |
324 | if (err == 0) { |
325 | __invalidate_icache_range((unsigned long)codemem, 6UL); | |
326 | __flush_invalidate_dcache_range((unsigned long)codemem, 6UL); | |
327 | } | |
5a0015d6 CZ |
328 | |
329 | return err; | |
330 | } | |
331 | ||
5a0015d6 | 332 | |
5bdb7611 RW |
333 | static int setup_frame(struct ksignal *ksig, sigset_t *set, |
334 | struct pt_regs *regs) | |
5a0015d6 | 335 | { |
29c4dfd9 | 336 | struct rt_sigframe *frame; |
5bdb7611 | 337 | int err = 0, sig = ksig->sig; |
c50842df | 338 | unsigned long sp, ra, tp; |
5a0015d6 | 339 | |
29c4dfd9 | 340 | sp = regs->areg[1]; |
5a0015d6 | 341 | |
5bdb7611 | 342 | if ((ksig->ka.sa.sa_flags & SA_ONSTACK) != 0 && sas_ss_flags(sp) == 0) { |
29c4dfd9 | 343 | sp = current->sas_ss_sp + current->sas_ss_size; |
5a0015d6 CZ |
344 | } |
345 | ||
29c4dfd9 | 346 | frame = (void *)((sp - sizeof(*frame)) & -16ul); |
5a0015d6 | 347 | |
5a0015d6 CZ |
348 | if (regs->depc > 64) |
349 | panic ("Double exception sys_sigreturn\n"); | |
350 | ||
29c4dfd9 | 351 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) { |
5bdb7611 | 352 | return -EFAULT; |
29c4dfd9 | 353 | } |
5a0015d6 | 354 | |
5bdb7611 RW |
355 | if (ksig->ka.sa.sa_flags & SA_SIGINFO) { |
356 | err |= copy_siginfo_to_user(&frame->info, &ksig->info); | |
29c4dfd9 CZ |
357 | } |
358 | ||
359 | /* Create the user context. */ | |
5a0015d6 | 360 | |
5a0015d6 CZ |
361 | err |= __put_user(0, &frame->uc.uc_flags); |
362 | err |= __put_user(0, &frame->uc.uc_link); | |
0430f2f2 | 363 | err |= __save_altstack(&frame->uc.uc_stack, regs->areg[1]); |
c658eac6 | 364 | err |= setup_sigcontext(frame, regs); |
5a0015d6 CZ |
365 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
366 | ||
5bdb7611 RW |
367 | if (ksig->ka.sa.sa_flags & SA_RESTORER) { |
368 | ra = (unsigned long)ksig->ka.sa.sa_restorer; | |
44c64e6b | 369 | } else { |
5a0015d6 | 370 | |
44c64e6b | 371 | /* Create sys_rt_sigreturn syscall in stack frame */ |
29c4dfd9 | 372 | |
44c64e6b CZ |
373 | err |= gen_return_code(frame->retcode); |
374 | ||
375 | if (err) { | |
5bdb7611 | 376 | return -EFAULT; |
44c64e6b CZ |
377 | } |
378 | ra = (unsigned long) frame->retcode; | |
29c4dfd9 | 379 | } |
5a0015d6 | 380 | |
29c4dfd9 CZ |
381 | /* |
382 | * Create signal handler execution context. | |
5a0015d6 CZ |
383 | * Return context not modified until this point. |
384 | */ | |
29c4dfd9 | 385 | |
c50842df CZ |
386 | /* Set up registers for signal handler; preserve the threadptr */ |
387 | tp = regs->threadptr; | |
5bdb7611 | 388 | start_thread(regs, (unsigned long) ksig->ka.sa.sa_handler, |
29c4dfd9 CZ |
389 | (unsigned long) frame); |
390 | ||
391 | /* Set up a stack frame for a call4 | |
392 | * Note: PS.CALLINC is set to one by start_thread | |
393 | */ | |
29c4dfd9 | 394 | regs->areg[4] = (((unsigned long) ra) & 0x3fffffff) | 0x40000000; |
3e66701c | 395 | regs->areg[6] = (unsigned long) sig; |
29c4dfd9 CZ |
396 | regs->areg[7] = (unsigned long) &frame->info; |
397 | regs->areg[8] = (unsigned long) &frame->uc; | |
c50842df | 398 | regs->threadptr = tp; |
5a0015d6 | 399 | |
c130d3be MF |
400 | pr_debug("SIG rt deliver (%s:%d): signal=%d sp=%p pc=%08lx\n", |
401 | current->comm, current->pid, sig, frame, regs->pc); | |
5a0015d6 | 402 | |
3785006a | 403 | return 0; |
5a0015d6 CZ |
404 | } |
405 | ||
5a0015d6 CZ |
406 | /* |
407 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
408 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
409 | * mistake. | |
410 | * | |
411 | * Note that we go through the signals twice: once to check the signals that | |
412 | * the kernel can handle, and then we build all the user-level signal handling | |
413 | * stack-frames in one go after that. | |
414 | */ | |
a53bb24e | 415 | static void do_signal(struct pt_regs *regs) |
5a0015d6 | 416 | { |
5bdb7611 | 417 | struct ksignal ksig; |
5a0015d6 | 418 | |
29c4dfd9 CZ |
419 | task_pt_regs(current)->icountlevel = 0; |
420 | ||
5bdb7611 | 421 | if (get_signal(&ksig)) { |
9112a6b2 | 422 | int ret; |
29c4dfd9 CZ |
423 | |
424 | /* Are we from a system call? */ | |
425 | ||
426 | if ((signed)regs->syscall >= 0) { | |
5a0015d6 | 427 | |
29c4dfd9 CZ |
428 | /* If so, check system call restarting.. */ |
429 | ||
430 | switch (regs->areg[2]) { | |
431 | case -ERESTARTNOHAND: | |
432 | case -ERESTART_RESTARTBLOCK: | |
5a0015d6 CZ |
433 | regs->areg[2] = -EINTR; |
434 | break; | |
29c4dfd9 CZ |
435 | |
436 | case -ERESTARTSYS: | |
5bdb7611 | 437 | if (!(ksig.ka.sa.sa_flags & SA_RESTART)) { |
29c4dfd9 CZ |
438 | regs->areg[2] = -EINTR; |
439 | break; | |
440 | } | |
441 | /* fallthrough */ | |
442 | case -ERESTARTNOINTR: | |
443 | regs->areg[2] = regs->syscall; | |
444 | regs->pc -= 3; | |
445 | break; | |
446 | ||
447 | default: | |
448 | /* nothing to do */ | |
449 | if (regs->areg[2] != 0) | |
450 | break; | |
451 | } | |
5a0015d6 | 452 | } |
5a0015d6 | 453 | |
29c4dfd9 CZ |
454 | /* Whee! Actually deliver the signal. */ |
455 | /* Set up the stack frame */ | |
5bdb7611 RW |
456 | ret = setup_frame(&ksig, sigmask_to_save(), regs); |
457 | signal_setup_done(ret, &ksig, 0); | |
29c4dfd9 CZ |
458 | if (current->ptrace & PT_SINGLESTEP) |
459 | task_pt_regs(current)->icountlevel = 1; | |
5a0015d6 | 460 | |
9ccc9c75 | 461 | return; |
29c4dfd9 | 462 | } |
5a0015d6 | 463 | |
29c4dfd9 CZ |
464 | /* Did we come from a system call? */ |
465 | if ((signed) regs->syscall >= 0) { | |
466 | /* Restart the system call - no handlers present */ | |
467 | switch (regs->areg[2]) { | |
468 | case -ERESTARTNOHAND: | |
469 | case -ERESTARTSYS: | |
470 | case -ERESTARTNOINTR: | |
471 | regs->areg[2] = regs->syscall; | |
472 | regs->pc -= 3; | |
473 | break; | |
474 | case -ERESTART_RESTARTBLOCK: | |
475 | regs->areg[2] = __NR_restart_syscall; | |
476 | regs->pc -= 3; | |
477 | break; | |
478 | } | |
479 | } | |
9ccc9c75 AV |
480 | |
481 | /* If there's no signal to deliver, we just restore the saved mask. */ | |
51a7b448 | 482 | restore_saved_sigmask(); |
9ccc9c75 | 483 | |
29c4dfd9 CZ |
484 | if (current->ptrace & PT_SINGLESTEP) |
485 | task_pt_regs(current)->icountlevel = 1; | |
9ccc9c75 | 486 | return; |
5a0015d6 | 487 | } |
29c4dfd9 | 488 | |
a53bb24e AV |
489 | void do_notify_resume(struct pt_regs *regs) |
490 | { | |
a53bb24e AV |
491 | if (test_thread_flag(TIF_SIGPENDING)) |
492 | do_signal(regs); | |
493 | ||
a42c6ded | 494 | if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) |
a53bb24e | 495 | tracehook_notify_resume(regs); |
a53bb24e | 496 | } |