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> |
03248add | 22 | #include <linux/resume_user_mode.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 | 28 | #include <asm/coprocessor.h> |
4ec4b8b1 RD |
29 | #include <asm/processor.h> |
30 | #include <asm/syscall.h> | |
29c4dfd9 | 31 | #include <asm/unistd.h> |
5a0015d6 | 32 | |
5a0015d6 CZ |
33 | extern struct task_struct *coproc_owners[]; |
34 | ||
29c4dfd9 CZ |
35 | struct rt_sigframe |
36 | { | |
37 | struct siginfo info; | |
38 | struct ucontext uc; | |
c658eac6 CZ |
39 | struct { |
40 | xtregs_opt_t opt; | |
41 | xtregs_user_t user; | |
42 | #if XTENSA_HAVE_COPROCESSORS | |
43 | xtregs_coprocessor_t cp; | |
44 | #endif | |
45 | } xtregs; | |
29c4dfd9 CZ |
46 | unsigned char retcode[6]; |
47 | unsigned int window[4]; | |
48 | }; | |
49 | ||
da0a4e5c MF |
50 | #if defined(USER_SUPPORT_WINDOWED) |
51 | /* | |
29c4dfd9 CZ |
52 | * Flush register windows stored in pt_regs to stack. |
53 | * Returns 1 for errors. | |
5a0015d6 CZ |
54 | */ |
55 | ||
da0a4e5c | 56 | static int |
29c4dfd9 | 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 | 94 | } else if (m & 4) { /* call8 */ |
062b1c19 MF |
95 | if (copy_to_user(&SPILL_SLOT_CALL8(sp, 4), |
96 | ®s->areg[(base + 1) * 4], 16)) | |
29c4dfd9 CZ |
97 | goto errout; |
98 | inc = 2; | |
5a0015d6 | 99 | |
29c4dfd9 | 100 | } else if (m & 8) { /* call12 */ |
062b1c19 MF |
101 | if (copy_to_user(&SPILL_SLOT_CALL12(sp, 4), |
102 | ®s->areg[(base + 1) * 4], 32)) | |
29c4dfd9 CZ |
103 | goto errout; |
104 | inc = 3; | |
105 | } | |
5a0015d6 | 106 | |
29c4dfd9 | 107 | /* Save current frame a0..a3 under next SP */ |
5a0015d6 | 108 | |
29c4dfd9 | 109 | sp = regs->areg[((base + inc) * 4 + 1) % XCHAL_NUM_AREGS]; |
062b1c19 | 110 | if (copy_to_user(&SPILL_SLOT(sp, 0), ®s->areg[base * 4], 16)) |
29c4dfd9 CZ |
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 | ||
3befce8f CZ |
119 | regs->wmask = 1; |
120 | regs->windowstart = 1 << wb; | |
121 | ||
29c4dfd9 | 122 | return 0; |
5a0015d6 | 123 | |
29c4dfd9 CZ |
124 | errout: |
125 | return err; | |
126 | } | |
da0a4e5c MF |
127 | #else |
128 | static int | |
129 | flush_window_regs_user(struct pt_regs *regs) | |
130 | { | |
131 | return 0; | |
132 | } | |
133 | #endif | |
5a0015d6 CZ |
134 | |
135 | /* | |
29c4dfd9 CZ |
136 | * Note: We don't copy double exception 'regs', we have to finish double exc. |
137 | * first before we return to signal handler! This dbl.exc.handler might cause | |
138 | * another double exception, but I think we are fine as the situation is the | |
139 | * same as if we had returned to the signal handerl and got an interrupt | |
140 | * immediately... | |
5a0015d6 CZ |
141 | */ |
142 | ||
29c4dfd9 | 143 | static int |
c658eac6 | 144 | setup_sigcontext(struct rt_sigframe __user *frame, struct pt_regs *regs) |
5a0015d6 | 145 | { |
c658eac6 CZ |
146 | struct sigcontext __user *sc = &frame->uc.uc_mcontext; |
147 | struct thread_info *ti = current_thread_info(); | |
29c4dfd9 | 148 | int err = 0; |
5a0015d6 | 149 | |
29c4dfd9 CZ |
150 | #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) |
151 | COPY(pc); | |
152 | COPY(ps); | |
153 | COPY(lbeg); | |
154 | COPY(lend); | |
155 | COPY(lcount); | |
156 | COPY(sar); | |
157 | #undef COPY | |
5a0015d6 | 158 | |
29c4dfd9 CZ |
159 | err |= flush_window_regs_user(regs); |
160 | err |= __copy_to_user (sc->sc_a, regs->areg, 16 * 4); | |
c658eac6 | 161 | err |= __put_user(0, &sc->sc_xtregs); |
5a0015d6 | 162 | |
c658eac6 CZ |
163 | if (err) |
164 | return err; | |
5a0015d6 | 165 | |
c658eac6 | 166 | #if XTENSA_HAVE_COPROCESSORS |
11e969bc | 167 | coprocessor_flush_release_all(ti); |
c658eac6 CZ |
168 | err |= __copy_to_user(&frame->xtregs.cp, &ti->xtregs_cp, |
169 | sizeof (frame->xtregs.cp)); | |
5a0015d6 | 170 | #endif |
c658eac6 CZ |
171 | err |= __copy_to_user(&frame->xtregs.opt, ®s->xtregs_opt, |
172 | sizeof (xtregs_opt_t)); | |
173 | err |= __copy_to_user(&frame->xtregs.user, &ti->xtregs_user, | |
174 | sizeof (xtregs_user_t)); | |
175 | ||
176 | err |= __put_user(err ? NULL : &frame->xtregs, &sc->sc_xtregs); | |
5a0015d6 | 177 | |
29c4dfd9 CZ |
178 | return err; |
179 | } | |
5a0015d6 CZ |
180 | |
181 | static int | |
c658eac6 | 182 | restore_sigcontext(struct pt_regs *regs, struct rt_sigframe __user *frame) |
5a0015d6 | 183 | { |
c658eac6 CZ |
184 | struct sigcontext __user *sc = &frame->uc.uc_mcontext; |
185 | struct thread_info *ti = current_thread_info(); | |
5a0015d6 CZ |
186 | unsigned int err = 0; |
187 | unsigned long ps; | |
5a0015d6 CZ |
188 | |
189 | #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) | |
190 | COPY(pc); | |
5a0015d6 CZ |
191 | COPY(lbeg); |
192 | COPY(lend); | |
193 | COPY(lcount); | |
194 | COPY(sar); | |
5a0015d6 CZ |
195 | #undef COPY |
196 | ||
6a986984 | 197 | /* All registers were flushed to stack. Start with a pristine frame. */ |
29c4dfd9 CZ |
198 | |
199 | regs->wmask = 1; | |
200 | regs->windowbase = 0; | |
201 | regs->windowstart = 1; | |
202 | ||
6a986984 | 203 | regs->syscall = NO_SYSCALL; /* disable syscall checks */ |
c658eac6 | 204 | |
5a0015d6 CZ |
205 | /* For PS, restore only PS.CALLINC. |
206 | * Assume that all other bits are either the same as for the signal | |
207 | * handler, or the user mode value doesn't matter (e.g. PS.OWB). | |
208 | */ | |
209 | err |= __get_user(ps, &sc->sc_ps); | |
29c4dfd9 | 210 | regs->ps = (regs->ps & ~PS_CALLINC_MASK) | (ps & PS_CALLINC_MASK); |
5a0015d6 CZ |
211 | |
212 | /* Additional corruption checks */ | |
213 | ||
5a0015d6 | 214 | if ((regs->lcount > 0) |
29c4dfd9 | 215 | && ((regs->lbeg > TASK_SIZE) || (regs->lend > TASK_SIZE)) ) |
5a0015d6 CZ |
216 | err = 1; |
217 | ||
29c4dfd9 | 218 | err |= __copy_from_user(regs->areg, sc->sc_a, 16 * 4); |
5a0015d6 | 219 | |
c658eac6 CZ |
220 | if (err) |
221 | return err; | |
222 | ||
c4c4594b | 223 | /* The signal handler may have used coprocessors in which |
29c4dfd9 CZ |
224 | * case they are still enabled. We disable them to force a |
225 | * reloading of the original task's CP state by the lazy | |
226 | * context-switching mechanisms of CP exception handling. | |
227 | * Also, we essentially discard any coprocessor state that the | |
228 | * signal handler created. */ | |
5a0015d6 | 229 | |
c658eac6 CZ |
230 | #if XTENSA_HAVE_COPROCESSORS |
231 | coprocessor_release_all(ti); | |
232 | err |= __copy_from_user(&ti->xtregs_cp, &frame->xtregs.cp, | |
233 | sizeof (frame->xtregs.cp)); | |
5a0015d6 | 234 | #endif |
c658eac6 CZ |
235 | err |= __copy_from_user(&ti->xtregs_user, &frame->xtregs.user, |
236 | sizeof (xtregs_user_t)); | |
237 | err |= __copy_from_user(®s->xtregs_opt, &frame->xtregs.opt, | |
238 | sizeof (xtregs_opt_t)); | |
5a0015d6 CZ |
239 | |
240 | return err; | |
241 | } | |
242 | ||
5a0015d6 | 243 | |
29c4dfd9 CZ |
244 | /* |
245 | * Do a signal return; undo the signal stack. | |
246 | */ | |
5a0015d6 | 247 | |
9d9043f6 | 248 | asmlinkage long xtensa_rt_sigreturn(void) |
5a0015d6 | 249 | { |
9d9043f6 | 250 | struct pt_regs *regs = current_pt_regs(); |
29c4dfd9 | 251 | struct rt_sigframe __user *frame; |
5a0015d6 | 252 | sigset_t set; |
5a0015d6 | 253 | int ret; |
29c4dfd9 | 254 | |
188f677f | 255 | /* Always make any pending restarted system calls return -EINTR */ |
f56141e3 | 256 | current->restart_block.fn = do_no_restart_syscall; |
188f677f | 257 | |
5a0015d6 | 258 | if (regs->depc > 64) |
29c4dfd9 CZ |
259 | panic("rt_sigreturn in double exception!\n"); |
260 | ||
261 | frame = (struct rt_sigframe __user *) regs->areg[1]; | |
5a0015d6 | 262 | |
96d4f267 | 263 | if (!access_ok(frame, sizeof(*frame))) |
5a0015d6 CZ |
264 | goto badframe; |
265 | ||
266 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
267 | goto badframe; | |
268 | ||
d12f7c4a | 269 | set_current_blocked(&set); |
5a0015d6 | 270 | |
c658eac6 | 271 | if (restore_sigcontext(regs, frame)) |
5a0015d6 | 272 | goto badframe; |
29c4dfd9 | 273 | |
5a0015d6 CZ |
274 | ret = regs->areg[2]; |
275 | ||
0430f2f2 | 276 | if (restore_altstack(&frame->uc.uc_stack)) |
5a0015d6 | 277 | goto badframe; |
5a0015d6 CZ |
278 | |
279 | return ret; | |
280 | ||
281 | badframe: | |
3cf5d076 | 282 | force_sig(SIGSEGV); |
5a0015d6 CZ |
283 | return 0; |
284 | } | |
285 | ||
29c4dfd9 | 286 | |
5a0015d6 CZ |
287 | |
288 | /* | |
29c4dfd9 | 289 | * Set up a signal frame. |
5a0015d6 | 290 | */ |
5a0015d6 CZ |
291 | |
292 | static int | |
29c4dfd9 | 293 | gen_return_code(unsigned char *codemem) |
5a0015d6 | 294 | { |
5a0015d6 CZ |
295 | int err = 0; |
296 | ||
29c4dfd9 CZ |
297 | /* |
298 | * The 12-bit immediate is really split up within the 24-bit MOVI | |
299 | * instruction. As long as the above system call numbers fit within | |
300 | * 8-bits, the following code works fine. See the Xtensa ISA for | |
301 | * details. | |
5a0015d6 | 302 | */ |
5a0015d6 | 303 | |
29c4dfd9 CZ |
304 | #if __NR_rt_sigreturn > 255 |
305 | # error Generating the MOVI instruction below breaks! | |
5a0015d6 CZ |
306 | #endif |
307 | ||
5a0015d6 | 308 | #ifdef __XTENSA_EB__ /* Big Endian version */ |
29c4dfd9 CZ |
309 | /* Generate instruction: MOVI a2, __NR_rt_sigreturn */ |
310 | err |= __put_user(0x22, &codemem[0]); | |
311 | err |= __put_user(0x0a, &codemem[1]); | |
312 | err |= __put_user(__NR_rt_sigreturn, &codemem[2]); | |
313 | /* Generate instruction: SYSCALL */ | |
314 | err |= __put_user(0x00, &codemem[3]); | |
315 | err |= __put_user(0x05, &codemem[4]); | |
316 | err |= __put_user(0x00, &codemem[5]); | |
5a0015d6 CZ |
317 | |
318 | #elif defined __XTENSA_EL__ /* Little Endian version */ | |
29c4dfd9 CZ |
319 | /* Generate instruction: MOVI a2, __NR_rt_sigreturn */ |
320 | err |= __put_user(0x22, &codemem[0]); | |
321 | err |= __put_user(0xa0, &codemem[1]); | |
322 | err |= __put_user(__NR_rt_sigreturn, &codemem[2]); | |
323 | /* Generate instruction: SYSCALL */ | |
324 | err |= __put_user(0x00, &codemem[3]); | |
325 | err |= __put_user(0x50, &codemem[4]); | |
326 | err |= __put_user(0x00, &codemem[5]); | |
5a0015d6 | 327 | #else |
29c4dfd9 | 328 | # error Must use compiler for Xtensa processors. |
5a0015d6 | 329 | #endif |
5a0015d6 CZ |
330 | |
331 | /* Flush generated code out of the data cache */ | |
332 | ||
173d6681 CZ |
333 | if (err == 0) { |
334 | __invalidate_icache_range((unsigned long)codemem, 6UL); | |
335 | __flush_invalidate_dcache_range((unsigned long)codemem, 6UL); | |
336 | } | |
5a0015d6 CZ |
337 | |
338 | return err; | |
339 | } | |
340 | ||
5a0015d6 | 341 | |
5bdb7611 RW |
342 | static int setup_frame(struct ksignal *ksig, sigset_t *set, |
343 | struct pt_regs *regs) | |
5a0015d6 | 344 | { |
29c4dfd9 | 345 | struct rt_sigframe *frame; |
5bdb7611 | 346 | int err = 0, sig = ksig->sig; |
09f8a6db | 347 | unsigned long sp, ra, tp, ps; |
9c2cc74f MF |
348 | unsigned long handler = (unsigned long)ksig->ka.sa.sa_handler; |
349 | unsigned long handler_fdpic_GOT = 0; | |
09f8a6db | 350 | unsigned int base; |
9c2cc74f MF |
351 | bool fdpic = IS_ENABLED(CONFIG_BINFMT_ELF_FDPIC) && |
352 | (current->personality & FDPIC_FUNCPTRS); | |
353 | ||
354 | if (fdpic) { | |
355 | unsigned long __user *fdpic_func_desc = | |
356 | (unsigned long __user *)handler; | |
357 | if (__get_user(handler, &fdpic_func_desc[0]) || | |
358 | __get_user(handler_fdpic_GOT, &fdpic_func_desc[1])) | |
359 | return -EFAULT; | |
360 | } | |
5a0015d6 | 361 | |
29c4dfd9 | 362 | sp = regs->areg[1]; |
5a0015d6 | 363 | |
5bdb7611 | 364 | if ((ksig->ka.sa.sa_flags & SA_ONSTACK) != 0 && sas_ss_flags(sp) == 0) { |
29c4dfd9 | 365 | sp = current->sas_ss_sp + current->sas_ss_size; |
5a0015d6 CZ |
366 | } |
367 | ||
29c4dfd9 | 368 | frame = (void *)((sp - sizeof(*frame)) & -16ul); |
5a0015d6 | 369 | |
5a0015d6 CZ |
370 | if (regs->depc > 64) |
371 | panic ("Double exception sys_sigreturn\n"); | |
372 | ||
96d4f267 | 373 | if (!access_ok(frame, sizeof(*frame))) { |
5bdb7611 | 374 | return -EFAULT; |
29c4dfd9 | 375 | } |
5a0015d6 | 376 | |
5bdb7611 RW |
377 | if (ksig->ka.sa.sa_flags & SA_SIGINFO) { |
378 | err |= copy_siginfo_to_user(&frame->info, &ksig->info); | |
29c4dfd9 CZ |
379 | } |
380 | ||
381 | /* Create the user context. */ | |
5a0015d6 | 382 | |
5a0015d6 CZ |
383 | err |= __put_user(0, &frame->uc.uc_flags); |
384 | err |= __put_user(0, &frame->uc.uc_link); | |
0430f2f2 | 385 | err |= __save_altstack(&frame->uc.uc_stack, regs->areg[1]); |
c658eac6 | 386 | err |= setup_sigcontext(frame, regs); |
5a0015d6 CZ |
387 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
388 | ||
5bdb7611 | 389 | if (ksig->ka.sa.sa_flags & SA_RESTORER) { |
9c2cc74f MF |
390 | if (fdpic) { |
391 | unsigned long __user *fdpic_func_desc = | |
392 | (unsigned long __user *)ksig->ka.sa.sa_restorer; | |
393 | ||
394 | err |= __get_user(ra, fdpic_func_desc); | |
395 | } else { | |
396 | ra = (unsigned long)ksig->ka.sa.sa_restorer; | |
397 | } | |
44c64e6b | 398 | } else { |
5a0015d6 | 399 | |
44c64e6b | 400 | /* Create sys_rt_sigreturn syscall in stack frame */ |
29c4dfd9 | 401 | |
44c64e6b | 402 | err |= gen_return_code(frame->retcode); |
44c64e6b | 403 | ra = (unsigned long) frame->retcode; |
29c4dfd9 | 404 | } |
5a0015d6 | 405 | |
9c2cc74f MF |
406 | if (err) |
407 | return -EFAULT; | |
408 | ||
409 | /* | |
29c4dfd9 | 410 | * Create signal handler execution context. |
5a0015d6 CZ |
411 | * Return context not modified until this point. |
412 | */ | |
29c4dfd9 | 413 | |
c50842df CZ |
414 | /* Set up registers for signal handler; preserve the threadptr */ |
415 | tp = regs->threadptr; | |
09f8a6db | 416 | ps = regs->ps; |
9c2cc74f | 417 | start_thread(regs, handler, (unsigned long)frame); |
29c4dfd9 | 418 | |
09f8a6db MF |
419 | /* Set up a stack frame for a call4 if userspace uses windowed ABI */ |
420 | if (ps & PS_WOE_MASK) { | |
421 | base = 4; | |
422 | regs->areg[base] = | |
423 | (((unsigned long) ra) & 0x3fffffff) | 0x40000000; | |
424 | ps = (ps & ~(PS_CALLINC_MASK | PS_OWB_MASK)) | | |
425 | (1 << PS_CALLINC_SHIFT); | |
426 | } else { | |
427 | base = 0; | |
428 | regs->areg[base] = (unsigned long) ra; | |
429 | } | |
430 | regs->areg[base + 2] = (unsigned long) sig; | |
431 | regs->areg[base + 3] = (unsigned long) &frame->info; | |
432 | regs->areg[base + 4] = (unsigned long) &frame->uc; | |
c50842df | 433 | regs->threadptr = tp; |
09f8a6db | 434 | regs->ps = ps; |
9c2cc74f MF |
435 | if (fdpic) |
436 | regs->areg[base + 11] = handler_fdpic_GOT; | |
5a0015d6 | 437 | |
c130d3be MF |
438 | pr_debug("SIG rt deliver (%s:%d): signal=%d sp=%p pc=%08lx\n", |
439 | current->comm, current->pid, sig, frame, regs->pc); | |
5a0015d6 | 440 | |
3785006a | 441 | return 0; |
5a0015d6 CZ |
442 | } |
443 | ||
5a0015d6 CZ |
444 | /* |
445 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
446 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
447 | * mistake. | |
448 | * | |
449 | * Note that we go through the signals twice: once to check the signals that | |
450 | * the kernel can handle, and then we build all the user-level signal handling | |
451 | * stack-frames in one go after that. | |
452 | */ | |
a53bb24e | 453 | static void do_signal(struct pt_regs *regs) |
5a0015d6 | 454 | { |
5bdb7611 | 455 | struct ksignal ksig; |
5a0015d6 | 456 | |
29c4dfd9 CZ |
457 | task_pt_regs(current)->icountlevel = 0; |
458 | ||
5bdb7611 | 459 | if (get_signal(&ksig)) { |
9112a6b2 | 460 | int ret; |
29c4dfd9 CZ |
461 | |
462 | /* Are we from a system call? */ | |
463 | ||
6a986984 | 464 | if (regs->syscall != NO_SYSCALL) { |
5a0015d6 | 465 | |
29c4dfd9 CZ |
466 | /* If so, check system call restarting.. */ |
467 | ||
468 | switch (regs->areg[2]) { | |
469 | case -ERESTARTNOHAND: | |
470 | case -ERESTART_RESTARTBLOCK: | |
5a0015d6 CZ |
471 | regs->areg[2] = -EINTR; |
472 | break; | |
29c4dfd9 CZ |
473 | |
474 | case -ERESTARTSYS: | |
5bdb7611 | 475 | if (!(ksig.ka.sa.sa_flags & SA_RESTART)) { |
29c4dfd9 CZ |
476 | regs->areg[2] = -EINTR; |
477 | break; | |
478 | } | |
df561f66 | 479 | fallthrough; |
29c4dfd9 CZ |
480 | case -ERESTARTNOINTR: |
481 | regs->areg[2] = regs->syscall; | |
482 | regs->pc -= 3; | |
483 | break; | |
484 | ||
485 | default: | |
486 | /* nothing to do */ | |
487 | if (regs->areg[2] != 0) | |
488 | break; | |
489 | } | |
5a0015d6 | 490 | } |
5a0015d6 | 491 | |
29c4dfd9 CZ |
492 | /* Whee! Actually deliver the signal. */ |
493 | /* Set up the stack frame */ | |
5bdb7611 RW |
494 | ret = setup_frame(&ksig, sigmask_to_save(), regs); |
495 | signal_setup_done(ret, &ksig, 0); | |
4a3d2717 | 496 | if (test_thread_flag(TIF_SINGLESTEP)) |
29c4dfd9 | 497 | task_pt_regs(current)->icountlevel = 1; |
5a0015d6 | 498 | |
9ccc9c75 | 499 | return; |
29c4dfd9 | 500 | } |
5a0015d6 | 501 | |
29c4dfd9 | 502 | /* Did we come from a system call? */ |
6a986984 | 503 | if (regs->syscall != NO_SYSCALL) { |
29c4dfd9 CZ |
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 | |
4a3d2717 | 522 | if (test_thread_flag(TIF_SINGLESTEP)) |
29c4dfd9 | 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 | { | |
bec58f40 JA |
529 | if (test_thread_flag(TIF_SIGPENDING) || |
530 | test_thread_flag(TIF_NOTIFY_SIGNAL)) | |
a53bb24e AV |
531 | do_signal(regs); |
532 | ||
3c532798 | 533 | if (test_thread_flag(TIF_NOTIFY_RESUME)) |
03248add | 534 | resume_user_mode_work(regs); |
a53bb24e | 535 | } |