Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 1991, 1992 Linus Torvalds | |
7 | * Copyright (C) 1994 - 2000 Ralf Baechle | |
8 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. | |
9 | */ | |
02416dcf | 10 | #include <linux/cache.h> |
1f717929 | 11 | #include <linux/irqflags.h> |
1da177e4 LT |
12 | #include <linux/sched.h> |
13 | #include <linux/mm.h> | |
14 | #include <linux/personality.h> | |
15 | #include <linux/smp.h> | |
1da177e4 LT |
16 | #include <linux/kernel.h> |
17 | #include <linux/signal.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/wait.h> | |
20 | #include <linux/ptrace.h> | |
21 | #include <linux/unistd.h> | |
22 | #include <linux/compiler.h> | |
dbda6ac0 | 23 | #include <linux/syscalls.h> |
faea6234 | 24 | #include <linux/uaccess.h> |
733e5e4b | 25 | #include <linux/tracehook.h> |
1da177e4 | 26 | |
e50c0a8f | 27 | #include <asm/abi.h> |
1da177e4 LT |
28 | #include <asm/asm.h> |
29 | #include <linux/bitops.h> | |
30 | #include <asm/cacheflush.h> | |
31 | #include <asm/fpu.h> | |
32 | #include <asm/sim.h> | |
1da177e4 LT |
33 | #include <asm/ucontext.h> |
34 | #include <asm/cpu-features.h> | |
02416dcf | 35 | #include <asm/war.h> |
d814c28c | 36 | #include <asm/vdso.h> |
b81947c6 | 37 | #include <asm/dsp.h> |
1da177e4 LT |
38 | |
39 | #include "signal-common.h" | |
40 | ||
137f6f3e RB |
41 | static int (*save_fp_context)(struct sigcontext __user *sc); |
42 | static int (*restore_fp_context)(struct sigcontext __user *sc); | |
43 | ||
44 | extern asmlinkage int _save_fp_context(struct sigcontext __user *sc); | |
45 | extern asmlinkage int _restore_fp_context(struct sigcontext __user *sc); | |
46 | ||
47 | extern asmlinkage int fpu_emulator_save_context(struct sigcontext __user *sc); | |
48 | extern asmlinkage int fpu_emulator_restore_context(struct sigcontext __user *sc); | |
49 | ||
66680583 RB |
50 | struct sigframe { |
51 | u32 sf_ass[4]; /* argument save space for o32 */ | |
d814c28c | 52 | u32 sf_pad[2]; /* Was: signal trampoline */ |
66680583 RB |
53 | struct sigcontext sf_sc; |
54 | sigset_t sf_mask; | |
55 | }; | |
56 | ||
c0b9bae9 FBH |
57 | struct rt_sigframe { |
58 | u32 rs_ass[4]; /* argument save space for o32 */ | |
d814c28c | 59 | u32 rs_pad[2]; /* Was: signal trampoline */ |
c0b9bae9 FBH |
60 | struct siginfo rs_info; |
61 | struct ucontext rs_uc; | |
62 | }; | |
63 | ||
c3fc4ab3 FBH |
64 | /* |
65 | * Helper routines | |
66 | */ | |
faea6234 AN |
67 | static int protected_save_fp_context(struct sigcontext __user *sc) |
68 | { | |
69 | int err; | |
70 | while (1) { | |
71 | lock_fpu_owner(); | |
72 | own_fpu_inatomic(1); | |
73 | err = save_fp_context(sc); /* this might fail */ | |
74 | unlock_fpu_owner(); | |
75 | if (likely(!err)) | |
76 | break; | |
77 | /* touch the sigcontext and try again */ | |
78 | err = __put_user(0, &sc->sc_fpregs[0]) | | |
79 | __put_user(0, &sc->sc_fpregs[31]) | | |
80 | __put_user(0, &sc->sc_fpc_csr); | |
81 | if (err) | |
82 | break; /* really bad sigcontext */ | |
83 | } | |
84 | return err; | |
85 | } | |
86 | ||
87 | static int protected_restore_fp_context(struct sigcontext __user *sc) | |
88 | { | |
c726b822 | 89 | int err, tmp __maybe_unused; |
faea6234 AN |
90 | while (1) { |
91 | lock_fpu_owner(); | |
92 | own_fpu_inatomic(0); | |
93 | err = restore_fp_context(sc); /* this might fail */ | |
94 | unlock_fpu_owner(); | |
95 | if (likely(!err)) | |
96 | break; | |
97 | /* touch the sigcontext and try again */ | |
98 | err = __get_user(tmp, &sc->sc_fpregs[0]) | | |
99 | __get_user(tmp, &sc->sc_fpregs[31]) | | |
100 | __get_user(tmp, &sc->sc_fpc_csr); | |
101 | if (err) | |
102 | break; /* really bad sigcontext */ | |
103 | } | |
104 | return err; | |
105 | } | |
106 | ||
c3fc4ab3 FBH |
107 | int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
108 | { | |
109 | int err = 0; | |
110 | int i; | |
53dc8028 | 111 | unsigned int used_math; |
c3fc4ab3 FBH |
112 | |
113 | err |= __put_user(regs->cp0_epc, &sc->sc_pc); | |
114 | ||
115 | err |= __put_user(0, &sc->sc_regs[0]); | |
116 | for (i = 1; i < 32; i++) | |
117 | err |= __put_user(regs->regs[i], &sc->sc_regs[i]); | |
118 | ||
9693a853 FBH |
119 | #ifdef CONFIG_CPU_HAS_SMARTMIPS |
120 | err |= __put_user(regs->acx, &sc->sc_acx); | |
121 | #endif | |
c3fc4ab3 FBH |
122 | err |= __put_user(regs->hi, &sc->sc_mdhi); |
123 | err |= __put_user(regs->lo, &sc->sc_mdlo); | |
124 | if (cpu_has_dsp) { | |
125 | err |= __put_user(mfhi1(), &sc->sc_hi1); | |
126 | err |= __put_user(mflo1(), &sc->sc_lo1); | |
127 | err |= __put_user(mfhi2(), &sc->sc_hi2); | |
128 | err |= __put_user(mflo2(), &sc->sc_lo2); | |
129 | err |= __put_user(mfhi3(), &sc->sc_hi3); | |
130 | err |= __put_user(mflo3(), &sc->sc_lo3); | |
131 | err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); | |
132 | } | |
133 | ||
53dc8028 AN |
134 | used_math = !!used_math(); |
135 | err |= __put_user(used_math, &sc->sc_used_math); | |
c3fc4ab3 | 136 | |
53dc8028 | 137 | if (used_math) { |
c3fc4ab3 FBH |
138 | /* |
139 | * Save FPU state to signal context. Signal handler | |
140 | * will "inherit" current FPU state. | |
141 | */ | |
faea6234 | 142 | err |= protected_save_fp_context(sc); |
c3fc4ab3 FBH |
143 | } |
144 | return err; | |
145 | } | |
146 | ||
c6a2f467 AN |
147 | int fpcsr_pending(unsigned int __user *fpcsr) |
148 | { | |
149 | int err, sig = 0; | |
150 | unsigned int csr, enabled; | |
151 | ||
152 | err = __get_user(csr, fpcsr); | |
153 | enabled = FPU_CSR_UNI_X | ((csr & FPU_CSR_ALL_E) << 5); | |
154 | /* | |
155 | * If the signal handler set some FPU exceptions, clear it and | |
156 | * send SIGFPE. | |
157 | */ | |
158 | if (csr & enabled) { | |
159 | csr &= ~enabled; | |
160 | err |= __put_user(csr, fpcsr); | |
161 | sig = SIGFPE; | |
162 | } | |
163 | return err ?: sig; | |
164 | } | |
165 | ||
166 | static int | |
167 | check_and_restore_fp_context(struct sigcontext __user *sc) | |
168 | { | |
169 | int err, sig; | |
170 | ||
171 | err = sig = fpcsr_pending(&sc->sc_fpc_csr); | |
172 | if (err > 0) | |
173 | err = 0; | |
faea6234 | 174 | err |= protected_restore_fp_context(sc); |
c6a2f467 AN |
175 | return err ?: sig; |
176 | } | |
177 | ||
c3fc4ab3 FBH |
178 | int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
179 | { | |
180 | unsigned int used_math; | |
181 | unsigned long treg; | |
182 | int err = 0; | |
183 | int i; | |
184 | ||
185 | /* Always make any pending restarted system calls return -EINTR */ | |
186 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
187 | ||
188 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); | |
9693a853 FBH |
189 | |
190 | #ifdef CONFIG_CPU_HAS_SMARTMIPS | |
191 | err |= __get_user(regs->acx, &sc->sc_acx); | |
192 | #endif | |
c3fc4ab3 FBH |
193 | err |= __get_user(regs->hi, &sc->sc_mdhi); |
194 | err |= __get_user(regs->lo, &sc->sc_mdlo); | |
195 | if (cpu_has_dsp) { | |
196 | err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); | |
197 | err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); | |
198 | err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); | |
199 | err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); | |
200 | err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); | |
201 | err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); | |
202 | err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); | |
203 | } | |
204 | ||
205 | for (i = 1; i < 32; i++) | |
206 | err |= __get_user(regs->regs[i], &sc->sc_regs[i]); | |
207 | ||
208 | err |= __get_user(used_math, &sc->sc_used_math); | |
209 | conditional_used_math(used_math); | |
210 | ||
53dc8028 | 211 | if (used_math) { |
c3fc4ab3 | 212 | /* restore fpu context if we have used it before */ |
c6a2f467 AN |
213 | if (!err) |
214 | err = check_and_restore_fp_context(sc); | |
c3fc4ab3 FBH |
215 | } else { |
216 | /* signal handler may have used FPU. Give it up. */ | |
53dc8028 | 217 | lose_fpu(0); |
c3fc4ab3 FBH |
218 | } |
219 | ||
c3fc4ab3 FBH |
220 | return err; |
221 | } | |
222 | ||
223 | void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, | |
224 | size_t frame_size) | |
225 | { | |
226 | unsigned long sp; | |
227 | ||
228 | /* Default to using normal stack */ | |
229 | sp = regs->regs[29]; | |
230 | ||
231 | /* | |
232 | * FPU emulator may have it's own trampoline active just | |
233 | * above the user stack, 16-bytes before the next lowest | |
234 | * 16 byte boundary. Try to avoid trashing it. | |
235 | */ | |
236 | sp -= 32; | |
237 | ||
238 | /* This is the X/Open sanctioned signal stack switching. */ | |
239 | if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0)) | |
240 | sp = current->sas_ss_sp + current->sas_ss_size; | |
241 | ||
242 | return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK)); | |
243 | } | |
244 | ||
1da177e4 LT |
245 | /* |
246 | * Atomically swap in the new signal mask, and wait for a signal. | |
247 | */ | |
248 | ||
249 | #ifdef CONFIG_TRAD_SIGNALS | |
1910f4ab | 250 | SYSCALL_DEFINE1(sigsuspend, sigset_t __user *, uset) |
1da177e4 | 251 | { |
1910f4ab | 252 | return sys_rt_sigsuspend(uset, sizeof(sigset_t)); |
1da177e4 LT |
253 | } |
254 | #endif | |
255 | ||
1da177e4 | 256 | #ifdef CONFIG_TRAD_SIGNALS |
dbda6ac0 RB |
257 | SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act, |
258 | struct sigaction __user *, oact) | |
1da177e4 LT |
259 | { |
260 | struct k_sigaction new_ka, old_ka; | |
261 | int ret; | |
262 | int err = 0; | |
263 | ||
264 | if (act) { | |
265 | old_sigset_t mask; | |
266 | ||
267 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
268 | return -EFAULT; | |
269 | err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler); | |
270 | err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
271 | err |= __get_user(mask, &act->sa_mask.sig[0]); | |
272 | if (err) | |
273 | return -EFAULT; | |
274 | ||
275 | siginitset(&new_ka.sa.sa_mask, mask); | |
276 | } | |
277 | ||
278 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
279 | ||
280 | if (!ret && oact) { | |
281 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
e0daad44 | 282 | return -EFAULT; |
1da177e4 LT |
283 | err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
284 | err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler); | |
285 | err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); | |
286 | err |= __put_user(0, &oact->sa_mask.sig[1]); | |
287 | err |= __put_user(0, &oact->sa_mask.sig[2]); | |
288 | err |= __put_user(0, &oact->sa_mask.sig[3]); | |
289 | if (err) | |
290 | return -EFAULT; | |
291 | } | |
292 | ||
293 | return ret; | |
294 | } | |
295 | #endif | |
296 | ||
1da177e4 | 297 | #ifdef CONFIG_TRAD_SIGNALS |
f90080a0 | 298 | asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 299 | { |
9bbf28a3 | 300 | struct sigframe __user *frame; |
1da177e4 | 301 | sigset_t blocked; |
c6a2f467 | 302 | int sig; |
1da177e4 | 303 | |
9bbf28a3 | 304 | frame = (struct sigframe __user *) regs.regs[29]; |
1da177e4 LT |
305 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
306 | goto badframe; | |
307 | if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked))) | |
308 | goto badframe; | |
309 | ||
8598f3cd | 310 | set_current_blocked(&blocked); |
1da177e4 | 311 | |
c6a2f467 AN |
312 | sig = restore_sigcontext(®s, &frame->sf_sc); |
313 | if (sig < 0) | |
1da177e4 | 314 | goto badframe; |
c6a2f467 AN |
315 | else if (sig) |
316 | force_sig(sig, current); | |
1da177e4 LT |
317 | |
318 | /* | |
319 | * Don't let your children do this ... | |
320 | */ | |
1da177e4 LT |
321 | __asm__ __volatile__( |
322 | "move\t$29, %0\n\t" | |
323 | "j\tsyscall_exit" | |
324 | :/* no outputs */ | |
325 | :"r" (®s)); | |
326 | /* Unreached */ | |
327 | ||
328 | badframe: | |
329 | force_sig(SIGSEGV, current); | |
330 | } | |
e50c0a8f | 331 | #endif /* CONFIG_TRAD_SIGNALS */ |
1da177e4 | 332 | |
f90080a0 | 333 | asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 334 | { |
9bbf28a3 | 335 | struct rt_sigframe __user *frame; |
1da177e4 | 336 | sigset_t set; |
c6a2f467 | 337 | int sig; |
1da177e4 | 338 | |
9bbf28a3 | 339 | frame = (struct rt_sigframe __user *) regs.regs[29]; |
1da177e4 LT |
340 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
341 | goto badframe; | |
342 | if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) | |
343 | goto badframe; | |
344 | ||
8598f3cd | 345 | set_current_blocked(&set); |
1da177e4 | 346 | |
c6a2f467 AN |
347 | sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext); |
348 | if (sig < 0) | |
1da177e4 | 349 | goto badframe; |
c6a2f467 AN |
350 | else if (sig) |
351 | force_sig(sig, current); | |
1da177e4 | 352 | |
ea536ad4 AV |
353 | if (restore_altstack(&frame->rs_uc.uc_stack)) |
354 | goto badframe; | |
1da177e4 LT |
355 | |
356 | /* | |
357 | * Don't let your children do this ... | |
358 | */ | |
359 | __asm__ __volatile__( | |
360 | "move\t$29, %0\n\t" | |
361 | "j\tsyscall_exit" | |
362 | :/* no outputs */ | |
363 | :"r" (®s)); | |
364 | /* Unreached */ | |
365 | ||
366 | badframe: | |
367 | force_sig(SIGSEGV, current); | |
368 | } | |
369 | ||
370 | #ifdef CONFIG_TRAD_SIGNALS | |
d814c28c DD |
371 | static int setup_frame(void *sig_return, struct k_sigaction *ka, |
372 | struct pt_regs *regs, int signr, sigset_t *set) | |
1da177e4 | 373 | { |
9bbf28a3 | 374 | struct sigframe __user *frame; |
1da177e4 LT |
375 | int err = 0; |
376 | ||
377 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
378 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
379 | goto give_sigsegv; | |
380 | ||
1da177e4 LT |
381 | err |= setup_sigcontext(regs, &frame->sf_sc); |
382 | err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set)); | |
383 | if (err) | |
384 | goto give_sigsegv; | |
385 | ||
386 | /* | |
387 | * Arguments to signal handler: | |
388 | * | |
389 | * a0 = signal number | |
390 | * a1 = 0 (should be cause) | |
391 | * a2 = pointer to struct sigcontext | |
392 | * | |
393 | * $25 and c0_epc point to the signal handler, $29 points to the | |
394 | * struct sigframe. | |
395 | */ | |
396 | regs->regs[ 4] = signr; | |
397 | regs->regs[ 5] = 0; | |
398 | regs->regs[ 6] = (unsigned long) &frame->sf_sc; | |
399 | regs->regs[29] = (unsigned long) frame; | |
d814c28c | 400 | regs->regs[31] = (unsigned long) sig_return; |
1da177e4 LT |
401 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; |
402 | ||
722bb63d | 403 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 | 404 | current->comm, current->pid, |
722bb63d | 405 | frame, regs->cp0_epc, regs->regs[31]); |
e0daad44 | 406 | return 0; |
1da177e4 LT |
407 | |
408 | give_sigsegv: | |
409 | force_sigsegv(signr, current); | |
7b3e2fc8 | 410 | return -EFAULT; |
1da177e4 LT |
411 | } |
412 | #endif | |
413 | ||
d814c28c | 414 | static int setup_rt_frame(void *sig_return, struct k_sigaction *ka, |
70342287 | 415 | struct pt_regs *regs, int signr, sigset_t *set, |
d814c28c | 416 | siginfo_t *info) |
1da177e4 | 417 | { |
9bbf28a3 | 418 | struct rt_sigframe __user *frame; |
1da177e4 LT |
419 | int err = 0; |
420 | ||
421 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
422 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
423 | goto give_sigsegv; | |
424 | ||
1da177e4 LT |
425 | /* Create siginfo. */ |
426 | err |= copy_siginfo_to_user(&frame->rs_info, info); | |
427 | ||
70342287 | 428 | /* Create the ucontext. */ |
1da177e4 | 429 | err |= __put_user(0, &frame->rs_uc.uc_flags); |
5665a0ac | 430 | err |= __put_user(NULL, &frame->rs_uc.uc_link); |
ea536ad4 | 431 | err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]); |
1da177e4 LT |
432 | err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); |
433 | err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); | |
434 | ||
435 | if (err) | |
436 | goto give_sigsegv; | |
437 | ||
438 | /* | |
439 | * Arguments to signal handler: | |
440 | * | |
441 | * a0 = signal number | |
442 | * a1 = 0 (should be cause) | |
443 | * a2 = pointer to ucontext | |
444 | * | |
445 | * $25 and c0_epc point to the signal handler, $29 points to | |
446 | * the struct rt_sigframe. | |
447 | */ | |
448 | regs->regs[ 4] = signr; | |
449 | regs->regs[ 5] = (unsigned long) &frame->rs_info; | |
450 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
451 | regs->regs[29] = (unsigned long) frame; | |
d814c28c | 452 | regs->regs[31] = (unsigned long) sig_return; |
1da177e4 LT |
453 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; |
454 | ||
722bb63d | 455 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 LT |
456 | current->comm, current->pid, |
457 | frame, regs->cp0_epc, regs->regs[31]); | |
722bb63d | 458 | |
7b3e2fc8 | 459 | return 0; |
1da177e4 LT |
460 | |
461 | give_sigsegv: | |
462 | force_sigsegv(signr, current); | |
7b3e2fc8 | 463 | return -EFAULT; |
1da177e4 LT |
464 | } |
465 | ||
151fd6ac RB |
466 | struct mips_abi mips_abi = { |
467 | #ifdef CONFIG_TRAD_SIGNALS | |
468 | .setup_frame = setup_frame, | |
d814c28c | 469 | .signal_return_offset = offsetof(struct mips_vdso, signal_trampoline), |
151fd6ac | 470 | #endif |
70342287 | 471 | .setup_rt_frame = setup_rt_frame, |
d814c28c DD |
472 | .rt_signal_return_offset = |
473 | offsetof(struct mips_vdso, rt_signal_trampoline), | |
151fd6ac RB |
474 | .restart = __NR_restart_syscall |
475 | }; | |
476 | ||
a610d6e6 | 477 | static void handle_signal(unsigned long sig, siginfo_t *info, |
b7f9a11a | 478 | struct k_sigaction *ka, struct pt_regs *regs) |
1da177e4 | 479 | { |
b7f9a11a | 480 | sigset_t *oldset = sigmask_to_save(); |
129bc8f7 | 481 | int ret; |
d814c28c DD |
482 | struct mips_abi *abi = current->thread.abi; |
483 | void *vdso = current->mm->context.vdso; | |
129bc8f7 | 484 | |
8f5a00eb AV |
485 | if (regs->regs[0]) { |
486 | switch(regs->regs[2]) { | |
487 | case ERESTART_RESTARTBLOCK: | |
488 | case ERESTARTNOHAND: | |
1da177e4 LT |
489 | regs->regs[2] = EINTR; |
490 | break; | |
8f5a00eb AV |
491 | case ERESTARTSYS: |
492 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
493 | regs->regs[2] = EINTR; | |
494 | break; | |
495 | } | |
496 | /* fallthrough */ | |
497 | case ERESTARTNOINTR: | |
498 | regs->regs[7] = regs->regs[26]; | |
499 | regs->regs[2] = regs->regs[0]; | |
500 | regs->cp0_epc -= 4; | |
1da177e4 | 501 | } |
1da177e4 | 502 | |
70342287 | 503 | regs->regs[0] = 0; /* Don't deal with this again. */ |
8f5a00eb | 504 | } |
1da177e4 | 505 | |
e50c0a8f | 506 | if (sig_uses_siginfo(ka)) |
d814c28c DD |
507 | ret = abi->setup_rt_frame(vdso + abi->rt_signal_return_offset, |
508 | ka, regs, sig, oldset, info); | |
1da177e4 | 509 | else |
d814c28c DD |
510 | ret = abi->setup_frame(vdso + abi->signal_return_offset, |
511 | ka, regs, sig, oldset); | |
1da177e4 | 512 | |
062ab57b | 513 | if (ret) |
a610d6e6 | 514 | return; |
062ab57b | 515 | |
efee984c | 516 | signal_delivered(sig, info, ka, regs, 0); |
1da177e4 LT |
517 | } |
518 | ||
151fd6ac | 519 | static void do_signal(struct pt_regs *regs) |
1da177e4 LT |
520 | { |
521 | struct k_sigaction ka; | |
522 | siginfo_t info; | |
523 | int signr; | |
524 | ||
1da177e4 | 525 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
7b3e2fc8 | 526 | if (signr > 0) { |
70342287 | 527 | /* Whee! Actually deliver the signal. */ |
a610d6e6 | 528 | handle_signal(signr, &info, &ka, regs); |
45887e12 | 529 | return; |
7b3e2fc8 | 530 | } |
1da177e4 | 531 | |
1da177e4 | 532 | if (regs->regs[0]) { |
9ec9b5ac RB |
533 | switch (regs->regs[2]) { |
534 | case ERESTARTNOHAND: | |
535 | case ERESTARTSYS: | |
536 | case ERESTARTNOINTR: | |
8f5a00eb | 537 | regs->regs[2] = regs->regs[0]; |
1da177e4 | 538 | regs->regs[7] = regs->regs[26]; |
8f5a00eb | 539 | regs->cp0_epc -= 4; |
9ec9b5ac RB |
540 | break; |
541 | ||
542 | case ERESTART_RESTARTBLOCK: | |
151fd6ac | 543 | regs->regs[2] = current->thread.abi->restart; |
1da177e4 LT |
544 | regs->regs[7] = regs->regs[26]; |
545 | regs->cp0_epc -= 4; | |
9ec9b5ac | 546 | break; |
1da177e4 | 547 | } |
70342287 | 548 | regs->regs[0] = 0; /* Don't deal with this again. */ |
1da177e4 | 549 | } |
7b3e2fc8 RB |
550 | |
551 | /* | |
552 | * If there's no signal to deliver, we just put the saved sigmask | |
553 | * back | |
554 | */ | |
51a7b448 | 555 | restore_saved_sigmask(); |
1da177e4 LT |
556 | } |
557 | ||
558 | /* | |
559 | * notification of userspace execution resumption | |
7b3e2fc8 | 560 | * - triggered by the TIF_WORK_MASK flags |
1da177e4 | 561 | */ |
7b3e2fc8 | 562 | asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, |
1da177e4 LT |
563 | __u32 thread_info_flags) |
564 | { | |
1f717929 RB |
565 | local_irq_enable(); |
566 | ||
1da177e4 | 567 | /* deal with pending signal delivery */ |
6fd84c08 | 568 | if (thread_info_flags & _TIF_SIGPENDING) |
151fd6ac | 569 | do_signal(regs); |
d0420c83 DH |
570 | |
571 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { | |
572 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
573 | tracehook_notify_resume(regs); | |
574 | } | |
1da177e4 | 575 | } |
137f6f3e RB |
576 | |
577 | #ifdef CONFIG_SMP | |
578 | static int smp_save_fp_context(struct sigcontext __user *sc) | |
579 | { | |
580 | return raw_cpu_has_fpu | |
581 | ? _save_fp_context(sc) | |
582 | : fpu_emulator_save_context(sc); | |
583 | } | |
584 | ||
585 | static int smp_restore_fp_context(struct sigcontext __user *sc) | |
586 | { | |
587 | return raw_cpu_has_fpu | |
588 | ? _restore_fp_context(sc) | |
589 | : fpu_emulator_restore_context(sc); | |
590 | } | |
591 | #endif | |
592 | ||
593 | static int signal_setup(void) | |
594 | { | |
595 | #ifdef CONFIG_SMP | |
596 | /* For now just do the cpu_has_fpu check when the functions are invoked */ | |
597 | save_fp_context = smp_save_fp_context; | |
598 | restore_fp_context = smp_restore_fp_context; | |
599 | #else | |
600 | if (cpu_has_fpu) { | |
601 | save_fp_context = _save_fp_context; | |
602 | restore_fp_context = _restore_fp_context; | |
603 | } else { | |
604 | save_fp_context = fpu_emulator_save_context; | |
605 | restore_fp_context = fpu_emulator_restore_context; | |
606 | } | |
607 | #endif | |
608 | ||
609 | return 0; | |
610 | } | |
611 | ||
612 | arch_initcall(signal_setup); |