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 CZ |
38 | struct rt_sigframe |
39 | { | |
40 | struct siginfo info; | |
41 | struct ucontext uc; | |
c658eac6 CZ |
42 | struct { |
43 | xtregs_opt_t opt; | |
44 | xtregs_user_t user; | |
45 | #if XTENSA_HAVE_COPROCESSORS | |
46 | xtregs_coprocessor_t cp; | |
47 | #endif | |
48 | } xtregs; | |
29c4dfd9 CZ |
49 | unsigned char retcode[6]; |
50 | unsigned int window[4]; | |
51 | }; | |
52 | ||
53 | /* | |
54 | * Flush register windows stored in pt_regs to stack. | |
55 | * Returns 1 for errors. | |
5a0015d6 CZ |
56 | */ |
57 | ||
29c4dfd9 CZ |
58 | int |
59 | flush_window_regs_user(struct pt_regs *regs) | |
5a0015d6 | 60 | { |
29c4dfd9 CZ |
61 | const unsigned long ws = regs->windowstart; |
62 | const unsigned long wb = regs->windowbase; | |
63 | unsigned long sp = 0; | |
64 | unsigned long wm; | |
65 | int err = 1; | |
66 | int base; | |
5a0015d6 | 67 | |
29c4dfd9 | 68 | /* Return if no other frames. */ |
5a0015d6 | 69 | |
29c4dfd9 CZ |
70 | if (regs->wmask == 1) |
71 | return 0; | |
5a0015d6 | 72 | |
29c4dfd9 | 73 | /* Rotate windowmask and skip empty frames. */ |
5a0015d6 | 74 | |
29c4dfd9 CZ |
75 | wm = (ws >> wb) | (ws << (XCHAL_NUM_AREGS / 4 - wb)); |
76 | base = (XCHAL_NUM_AREGS / 4) - (regs->wmask >> 4); | |
77 | ||
78 | /* For call8 or call12 frames, we need the previous stack pointer. */ | |
5a0015d6 | 79 | |
29c4dfd9 CZ |
80 | if ((regs->wmask & 2) == 0) |
81 | if (__get_user(sp, (int*)(regs->areg[base * 4 + 1] - 12))) | |
82 | goto errout; | |
5a0015d6 | 83 | |
29c4dfd9 | 84 | /* Spill frames to stack. */ |
5a0015d6 | 85 | |
29c4dfd9 | 86 | while (base < XCHAL_NUM_AREGS / 4) { |
5a0015d6 | 87 | |
29c4dfd9 CZ |
88 | int m = (wm >> base); |
89 | int inc = 0; | |
5a0015d6 | 90 | |
29c4dfd9 | 91 | /* Save registers a4..a7 (call8) or a4...a11 (call12) */ |
5a0015d6 | 92 | |
29c4dfd9 CZ |
93 | if (m & 2) { /* call4 */ |
94 | inc = 1; | |
5a0015d6 | 95 | |
29c4dfd9 CZ |
96 | } else if (m & 4) { /* call8 */ |
97 | if (copy_to_user((void*)(sp - 32), | |
98 | ®s->areg[(base + 1) * 4], 16)) | |
99 | goto errout; | |
100 | inc = 2; | |
5a0015d6 | 101 | |
29c4dfd9 CZ |
102 | } else if (m & 8) { /* call12 */ |
103 | if (copy_to_user((void*)(sp - 48), | |
104 | ®s->areg[(base + 1) * 4], 32)) | |
105 | goto errout; | |
106 | inc = 3; | |
107 | } | |
5a0015d6 | 108 | |
29c4dfd9 | 109 | /* Save current frame a0..a3 under next SP */ |
5a0015d6 | 110 | |
29c4dfd9 CZ |
111 | sp = regs->areg[((base + inc) * 4 + 1) % XCHAL_NUM_AREGS]; |
112 | if (copy_to_user((void*)(sp - 16), ®s->areg[base * 4], 16)) | |
113 | goto errout; | |
114 | ||
115 | /* Get current stack pointer for next loop iteration. */ | |
116 | ||
117 | sp = regs->areg[base * 4 + 1]; | |
118 | base += inc; | |
119 | } | |
120 | ||
3befce8f CZ |
121 | regs->wmask = 1; |
122 | regs->windowstart = 1 << wb; | |
123 | ||
29c4dfd9 | 124 | return 0; |
5a0015d6 | 125 | |
29c4dfd9 CZ |
126 | errout: |
127 | return err; | |
128 | } | |
5a0015d6 CZ |
129 | |
130 | /* | |
29c4dfd9 CZ |
131 | * Note: We don't copy double exception 'regs', we have to finish double exc. |
132 | * first before we return to signal handler! This dbl.exc.handler might cause | |
133 | * another double exception, but I think we are fine as the situation is the | |
134 | * same as if we had returned to the signal handerl and got an interrupt | |
135 | * immediately... | |
5a0015d6 CZ |
136 | */ |
137 | ||
29c4dfd9 | 138 | static int |
c658eac6 | 139 | setup_sigcontext(struct rt_sigframe __user *frame, struct pt_regs *regs) |
5a0015d6 | 140 | { |
c658eac6 CZ |
141 | struct sigcontext __user *sc = &frame->uc.uc_mcontext; |
142 | struct thread_info *ti = current_thread_info(); | |
29c4dfd9 | 143 | int err = 0; |
5a0015d6 | 144 | |
29c4dfd9 CZ |
145 | #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) |
146 | COPY(pc); | |
147 | COPY(ps); | |
148 | COPY(lbeg); | |
149 | COPY(lend); | |
150 | COPY(lcount); | |
151 | COPY(sar); | |
152 | #undef COPY | |
5a0015d6 | 153 | |
29c4dfd9 CZ |
154 | err |= flush_window_regs_user(regs); |
155 | err |= __copy_to_user (sc->sc_a, regs->areg, 16 * 4); | |
c658eac6 | 156 | err |= __put_user(0, &sc->sc_xtregs); |
5a0015d6 | 157 | |
c658eac6 CZ |
158 | if (err) |
159 | return err; | |
5a0015d6 | 160 | |
c658eac6 CZ |
161 | #if XTENSA_HAVE_COPROCESSORS |
162 | coprocessor_flush_all(ti); | |
163 | coprocessor_release_all(ti); | |
164 | err |= __copy_to_user(&frame->xtregs.cp, &ti->xtregs_cp, | |
165 | sizeof (frame->xtregs.cp)); | |
5a0015d6 | 166 | #endif |
c658eac6 CZ |
167 | err |= __copy_to_user(&frame->xtregs.opt, ®s->xtregs_opt, |
168 | sizeof (xtregs_opt_t)); | |
169 | err |= __copy_to_user(&frame->xtregs.user, &ti->xtregs_user, | |
170 | sizeof (xtregs_user_t)); | |
171 | ||
172 | err |= __put_user(err ? NULL : &frame->xtregs, &sc->sc_xtregs); | |
5a0015d6 | 173 | |
29c4dfd9 CZ |
174 | return err; |
175 | } | |
5a0015d6 CZ |
176 | |
177 | static int | |
c658eac6 | 178 | restore_sigcontext(struct pt_regs *regs, struct rt_sigframe __user *frame) |
5a0015d6 | 179 | { |
c658eac6 CZ |
180 | struct sigcontext __user *sc = &frame->uc.uc_mcontext; |
181 | struct thread_info *ti = current_thread_info(); | |
5a0015d6 CZ |
182 | unsigned int err = 0; |
183 | unsigned long ps; | |
5a0015d6 CZ |
184 | |
185 | #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) | |
186 | COPY(pc); | |
5a0015d6 CZ |
187 | COPY(lbeg); |
188 | COPY(lend); | |
189 | COPY(lcount); | |
190 | COPY(sar); | |
5a0015d6 CZ |
191 | #undef COPY |
192 | ||
29c4dfd9 CZ |
193 | /* All registers were flushed to stack. Start with a prestine frame. */ |
194 | ||
195 | regs->wmask = 1; | |
196 | regs->windowbase = 0; | |
197 | regs->windowstart = 1; | |
198 | ||
c658eac6 CZ |
199 | regs->syscall = -1; /* disable syscall checks */ |
200 | ||
5a0015d6 CZ |
201 | /* For PS, restore only PS.CALLINC. |
202 | * Assume that all other bits are either the same as for the signal | |
203 | * handler, or the user mode value doesn't matter (e.g. PS.OWB). | |
204 | */ | |
205 | err |= __get_user(ps, &sc->sc_ps); | |
29c4dfd9 | 206 | regs->ps = (regs->ps & ~PS_CALLINC_MASK) | (ps & PS_CALLINC_MASK); |
5a0015d6 CZ |
207 | |
208 | /* Additional corruption checks */ | |
209 | ||
5a0015d6 | 210 | if ((regs->lcount > 0) |
29c4dfd9 | 211 | && ((regs->lbeg > TASK_SIZE) || (regs->lend > TASK_SIZE)) ) |
5a0015d6 CZ |
212 | err = 1; |
213 | ||
29c4dfd9 | 214 | err |= __copy_from_user(regs->areg, sc->sc_a, 16 * 4); |
5a0015d6 | 215 | |
c658eac6 CZ |
216 | if (err) |
217 | return err; | |
218 | ||
29c4dfd9 CZ |
219 | /* The signal handler may have used coprocessors in which |
220 | * case they are still enabled. We disable them to force a | |
221 | * reloading of the original task's CP state by the lazy | |
222 | * context-switching mechanisms of CP exception handling. | |
223 | * Also, we essentially discard any coprocessor state that the | |
224 | * signal handler created. */ | |
5a0015d6 | 225 | |
c658eac6 CZ |
226 | #if XTENSA_HAVE_COPROCESSORS |
227 | coprocessor_release_all(ti); | |
228 | err |= __copy_from_user(&ti->xtregs_cp, &frame->xtregs.cp, | |
229 | sizeof (frame->xtregs.cp)); | |
5a0015d6 | 230 | #endif |
c658eac6 CZ |
231 | err |= __copy_from_user(&ti->xtregs_user, &frame->xtregs.user, |
232 | sizeof (xtregs_user_t)); | |
233 | err |= __copy_from_user(®s->xtregs_opt, &frame->xtregs.opt, | |
234 | sizeof (xtregs_opt_t)); | |
5a0015d6 CZ |
235 | |
236 | return err; | |
237 | } | |
238 | ||
5a0015d6 | 239 | |
29c4dfd9 CZ |
240 | /* |
241 | * Do a signal return; undo the signal stack. | |
242 | */ | |
5a0015d6 | 243 | |
29c4dfd9 CZ |
244 | asmlinkage long xtensa_rt_sigreturn(long a0, long a1, long a2, long a3, |
245 | long a4, long a5, struct pt_regs *regs) | |
5a0015d6 | 246 | { |
29c4dfd9 | 247 | struct rt_sigframe __user *frame; |
5a0015d6 | 248 | sigset_t set; |
5a0015d6 | 249 | int ret; |
29c4dfd9 | 250 | |
5a0015d6 | 251 | if (regs->depc > 64) |
29c4dfd9 CZ |
252 | panic("rt_sigreturn in double exception!\n"); |
253 | ||
254 | frame = (struct rt_sigframe __user *) regs->areg[1]; | |
5a0015d6 | 255 | |
b9e122c8 | 256 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
5a0015d6 CZ |
257 | goto badframe; |
258 | ||
259 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) | |
260 | goto badframe; | |
261 | ||
262 | sigdelsetmask(&set, ~_BLOCKABLE); | |
263 | spin_lock_irq(¤t->sighand->siglock); | |
264 | current->blocked = set; | |
265 | recalc_sigpending(); | |
266 | spin_unlock_irq(¤t->sighand->siglock); | |
267 | ||
c658eac6 | 268 | if (restore_sigcontext(regs, frame)) |
5a0015d6 | 269 | goto badframe; |
29c4dfd9 | 270 | |
5a0015d6 CZ |
271 | ret = regs->areg[2]; |
272 | ||
29c4dfd9 | 273 | if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->areg[1]) == -EFAULT) |
5a0015d6 | 274 | goto badframe; |
5a0015d6 CZ |
275 | |
276 | return ret; | |
277 | ||
278 | badframe: | |
279 | force_sig(SIGSEGV, current); | |
280 | return 0; | |
281 | } | |
282 | ||
29c4dfd9 | 283 | |
5a0015d6 CZ |
284 | |
285 | /* | |
29c4dfd9 | 286 | * Set up a signal frame. |
5a0015d6 | 287 | */ |
5a0015d6 CZ |
288 | |
289 | static int | |
29c4dfd9 | 290 | gen_return_code(unsigned char *codemem) |
5a0015d6 | 291 | { |
5a0015d6 CZ |
292 | int err = 0; |
293 | ||
29c4dfd9 CZ |
294 | /* |
295 | * The 12-bit immediate is really split up within the 24-bit MOVI | |
296 | * instruction. As long as the above system call numbers fit within | |
297 | * 8-bits, the following code works fine. See the Xtensa ISA for | |
298 | * details. | |
5a0015d6 | 299 | */ |
5a0015d6 | 300 | |
29c4dfd9 CZ |
301 | #if __NR_rt_sigreturn > 255 |
302 | # error Generating the MOVI instruction below breaks! | |
5a0015d6 CZ |
303 | #endif |
304 | ||
5a0015d6 | 305 | #ifdef __XTENSA_EB__ /* Big Endian version */ |
29c4dfd9 CZ |
306 | /* Generate instruction: MOVI a2, __NR_rt_sigreturn */ |
307 | err |= __put_user(0x22, &codemem[0]); | |
308 | err |= __put_user(0x0a, &codemem[1]); | |
309 | err |= __put_user(__NR_rt_sigreturn, &codemem[2]); | |
310 | /* Generate instruction: SYSCALL */ | |
311 | err |= __put_user(0x00, &codemem[3]); | |
312 | err |= __put_user(0x05, &codemem[4]); | |
313 | err |= __put_user(0x00, &codemem[5]); | |
5a0015d6 CZ |
314 | |
315 | #elif defined __XTENSA_EL__ /* Little Endian version */ | |
29c4dfd9 CZ |
316 | /* Generate instruction: MOVI a2, __NR_rt_sigreturn */ |
317 | err |= __put_user(0x22, &codemem[0]); | |
318 | err |= __put_user(0xa0, &codemem[1]); | |
319 | err |= __put_user(__NR_rt_sigreturn, &codemem[2]); | |
320 | /* Generate instruction: SYSCALL */ | |
321 | err |= __put_user(0x00, &codemem[3]); | |
322 | err |= __put_user(0x50, &codemem[4]); | |
323 | err |= __put_user(0x00, &codemem[5]); | |
5a0015d6 | 324 | #else |
29c4dfd9 | 325 | # error Must use compiler for Xtensa processors. |
5a0015d6 | 326 | #endif |
5a0015d6 CZ |
327 | |
328 | /* Flush generated code out of the data cache */ | |
329 | ||
173d6681 CZ |
330 | if (err == 0) { |
331 | __invalidate_icache_range((unsigned long)codemem, 6UL); | |
332 | __flush_invalidate_dcache_range((unsigned long)codemem, 6UL); | |
333 | } | |
5a0015d6 CZ |
334 | |
335 | return err; | |
336 | } | |
337 | ||
5a0015d6 | 338 | |
29c4dfd9 | 339 | static void setup_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
5a0015d6 CZ |
340 | sigset_t *set, struct pt_regs *regs) |
341 | { | |
29c4dfd9 | 342 | struct rt_sigframe *frame; |
5a0015d6 CZ |
343 | int err = 0; |
344 | int signal; | |
29c4dfd9 | 345 | unsigned long sp, ra; |
5a0015d6 | 346 | |
29c4dfd9 | 347 | sp = regs->areg[1]; |
5a0015d6 | 348 | |
29c4dfd9 CZ |
349 | if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! on_sig_stack(sp)) { |
350 | sp = current->sas_ss_sp + current->sas_ss_size; | |
5a0015d6 CZ |
351 | } |
352 | ||
29c4dfd9 | 353 | frame = (void *)((sp - sizeof(*frame)) & -16ul); |
5a0015d6 | 354 | |
5a0015d6 CZ |
355 | if (regs->depc > 64) |
356 | panic ("Double exception sys_sigreturn\n"); | |
357 | ||
29c4dfd9 | 358 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) { |
5a0015d6 | 359 | goto give_sigsegv; |
29c4dfd9 | 360 | } |
5a0015d6 CZ |
361 | |
362 | signal = current_thread_info()->exec_domain | |
363 | && current_thread_info()->exec_domain->signal_invmap | |
364 | && sig < 32 | |
365 | ? current_thread_info()->exec_domain->signal_invmap[sig] | |
366 | : sig; | |
367 | ||
29c4dfd9 CZ |
368 | if (ka->sa.sa_flags & SA_SIGINFO) { |
369 | err |= copy_siginfo_to_user(&frame->info, info); | |
370 | } | |
371 | ||
372 | /* Create the user context. */ | |
5a0015d6 | 373 | |
5a0015d6 CZ |
374 | err |= __put_user(0, &frame->uc.uc_flags); |
375 | err |= __put_user(0, &frame->uc.uc_link); | |
376 | err |= __put_user((void *)current->sas_ss_sp, | |
377 | &frame->uc.uc_stack.ss_sp); | |
378 | err |= __put_user(sas_ss_flags(regs->areg[1]), | |
379 | &frame->uc.uc_stack.ss_flags); | |
380 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); | |
c658eac6 | 381 | err |= setup_sigcontext(frame, regs); |
5a0015d6 CZ |
382 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
383 | ||
44c64e6b CZ |
384 | if (ka->sa.sa_flags & SA_RESTORER) { |
385 | ra = (unsigned long)ka->sa.sa_restorer; | |
386 | } else { | |
5a0015d6 | 387 | |
44c64e6b | 388 | /* Create sys_rt_sigreturn syscall in stack frame */ |
29c4dfd9 | 389 | |
44c64e6b CZ |
390 | err |= gen_return_code(frame->retcode); |
391 | ||
392 | if (err) { | |
393 | goto give_sigsegv; | |
394 | } | |
395 | ra = (unsigned long) frame->retcode; | |
29c4dfd9 | 396 | } |
5a0015d6 | 397 | |
29c4dfd9 CZ |
398 | /* |
399 | * Create signal handler execution context. | |
5a0015d6 CZ |
400 | * Return context not modified until this point. |
401 | */ | |
29c4dfd9 CZ |
402 | |
403 | /* Set up registers for signal handler */ | |
404 | start_thread(regs, (unsigned long) ka->sa.sa_handler, | |
405 | (unsigned long) frame); | |
406 | ||
407 | /* Set up a stack frame for a call4 | |
408 | * Note: PS.CALLINC is set to one by start_thread | |
409 | */ | |
29c4dfd9 CZ |
410 | regs->areg[4] = (((unsigned long) ra) & 0x3fffffff) | 0x40000000; |
411 | regs->areg[6] = (unsigned long) signal; | |
412 | regs->areg[7] = (unsigned long) &frame->info; | |
413 | regs->areg[8] = (unsigned long) &frame->uc; | |
5a0015d6 CZ |
414 | |
415 | /* Set access mode to USER_DS. Nomenclature is outdated, but | |
416 | * functionality is used in uaccess.h | |
417 | */ | |
418 | set_fs(USER_DS); | |
419 | ||
420 | #if DEBUG_SIG | |
421 | printk("SIG rt deliver (%s:%d): signal=%d sp=%p pc=%08x\n", | |
422 | current->comm, current->pid, signal, frame, regs->pc); | |
423 | #endif | |
424 | ||
425 | return; | |
426 | ||
427 | give_sigsegv: | |
428 | if (sig == SIGSEGV) | |
429 | ka->sa.sa_handler = SIG_DFL; | |
430 | force_sig(SIGSEGV, current); | |
431 | } | |
432 | ||
29c4dfd9 CZ |
433 | /* |
434 | * Atomically swap in the new signal mask, and wait for a signal. | |
435 | */ | |
436 | ||
437 | asmlinkage long xtensa_rt_sigsuspend(sigset_t __user *unewset, | |
438 | size_t sigsetsize, | |
439 | long a2, long a3, long a4, long a5, | |
440 | struct pt_regs *regs) | |
441 | { | |
442 | sigset_t saveset, newset; | |
443 | ||
444 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
445 | if (sigsetsize != sizeof(sigset_t)) | |
446 | return -EINVAL; | |
447 | ||
448 | if (copy_from_user(&newset, unewset, sizeof(newset))) | |
449 | return -EFAULT; | |
450 | ||
451 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
452 | spin_lock_irq(¤t->sighand->siglock); | |
453 | saveset = current->blocked; | |
454 | current->blocked = newset; | |
455 | recalc_sigpending(); | |
456 | spin_unlock_irq(¤t->sighand->siglock); | |
457 | ||
458 | regs->areg[2] = -EINTR; | |
459 | while (1) { | |
460 | current->state = TASK_INTERRUPTIBLE; | |
461 | schedule(); | |
462 | if (do_signal(regs, &saveset)) | |
463 | return -EINTR; | |
464 | } | |
465 | } | |
466 | ||
467 | asmlinkage long xtensa_sigaltstack(const stack_t __user *uss, | |
468 | stack_t __user *uoss, | |
469 | long a2, long a3, long a4, long a5, | |
470 | struct pt_regs *regs) | |
471 | { | |
472 | return do_sigaltstack(uss, uoss, regs->areg[1]); | |
473 | } | |
474 | ||
5a0015d6 CZ |
475 | |
476 | ||
477 | /* | |
478 | * Note that 'init' is a special process: it doesn't get signals it doesn't | |
479 | * want to handle. Thus you cannot kill init even with a SIGKILL even by | |
480 | * mistake. | |
481 | * | |
482 | * Note that we go through the signals twice: once to check the signals that | |
483 | * the kernel can handle, and then we build all the user-level signal handling | |
484 | * stack-frames in one go after that. | |
485 | */ | |
486 | int do_signal(struct pt_regs *regs, sigset_t *oldset) | |
487 | { | |
488 | siginfo_t info; | |
489 | int signr; | |
490 | struct k_sigaction ka; | |
491 | ||
29c4dfd9 CZ |
492 | if (!user_mode(regs)) |
493 | return 0; | |
494 | ||
495 | if (try_to_freeze()) | |
496 | goto no_signal; | |
497 | ||
5a0015d6 CZ |
498 | if (!oldset) |
499 | oldset = ¤t->blocked; | |
500 | ||
29c4dfd9 CZ |
501 | task_pt_regs(current)->icountlevel = 0; |
502 | ||
5a0015d6 CZ |
503 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
504 | ||
29c4dfd9 CZ |
505 | if (signr > 0) { |
506 | ||
507 | /* Are we from a system call? */ | |
508 | ||
509 | if ((signed)regs->syscall >= 0) { | |
5a0015d6 | 510 | |
29c4dfd9 CZ |
511 | /* If so, check system call restarting.. */ |
512 | ||
513 | switch (regs->areg[2]) { | |
514 | case -ERESTARTNOHAND: | |
515 | case -ERESTART_RESTARTBLOCK: | |
5a0015d6 CZ |
516 | regs->areg[2] = -EINTR; |
517 | break; | |
29c4dfd9 CZ |
518 | |
519 | case -ERESTARTSYS: | |
520 | if (!(ka.sa.sa_flags & SA_RESTART)) { | |
521 | regs->areg[2] = -EINTR; | |
522 | break; | |
523 | } | |
524 | /* fallthrough */ | |
525 | case -ERESTARTNOINTR: | |
526 | regs->areg[2] = regs->syscall; | |
527 | regs->pc -= 3; | |
528 | break; | |
529 | ||
530 | default: | |
531 | /* nothing to do */ | |
532 | if (regs->areg[2] != 0) | |
533 | break; | |
534 | } | |
5a0015d6 | 535 | } |
5a0015d6 | 536 | |
29c4dfd9 CZ |
537 | /* Whee! Actually deliver the signal. */ |
538 | /* Set up the stack frame */ | |
539 | setup_frame(signr, &ka, &info, oldset, regs); | |
5a0015d6 | 540 | |
29c4dfd9 CZ |
541 | if (ka.sa.sa_flags & SA_ONESHOT) |
542 | ka.sa.sa_handler = SIG_DFL; | |
5a0015d6 | 543 | |
29c4dfd9 CZ |
544 | spin_lock_irq(¤t->sighand->siglock); |
545 | sigorsets(¤t->blocked, ¤t->blocked, &ka.sa.sa_mask); | |
546 | if (!(ka.sa.sa_flags & SA_NODEFER)) | |
547 | sigaddset(¤t->blocked, signr); | |
548 | recalc_sigpending(); | |
549 | spin_unlock_irq(¤t->sighand->siglock); | |
550 | if (current->ptrace & PT_SINGLESTEP) | |
551 | task_pt_regs(current)->icountlevel = 1; | |
5a0015d6 | 552 | |
29c4dfd9 CZ |
553 | return 1; |
554 | } | |
5a0015d6 | 555 | |
29c4dfd9 CZ |
556 | no_signal: |
557 | /* Did we come from a system call? */ | |
558 | if ((signed) regs->syscall >= 0) { | |
559 | /* Restart the system call - no handlers present */ | |
560 | switch (regs->areg[2]) { | |
561 | case -ERESTARTNOHAND: | |
562 | case -ERESTARTSYS: | |
563 | case -ERESTARTNOINTR: | |
564 | regs->areg[2] = regs->syscall; | |
565 | regs->pc -= 3; | |
566 | break; | |
567 | case -ERESTART_RESTARTBLOCK: | |
568 | regs->areg[2] = __NR_restart_syscall; | |
569 | regs->pc -= 3; | |
570 | break; | |
571 | } | |
572 | } | |
573 | if (current->ptrace & PT_SINGLESTEP) | |
574 | task_pt_regs(current)->icountlevel = 1; | |
575 | return 0; | |
5a0015d6 | 576 | } |
29c4dfd9 | 577 |