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> |
1da177e4 LT |
11 | #include <linux/sched.h> |
12 | #include <linux/mm.h> | |
13 | #include <linux/personality.h> | |
14 | #include <linux/smp.h> | |
15 | #include <linux/smp_lock.h> | |
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> | |
23 | ||
e50c0a8f | 24 | #include <asm/abi.h> |
1da177e4 LT |
25 | #include <asm/asm.h> |
26 | #include <linux/bitops.h> | |
27 | #include <asm/cacheflush.h> | |
28 | #include <asm/fpu.h> | |
29 | #include <asm/sim.h> | |
30 | #include <asm/uaccess.h> | |
31 | #include <asm/ucontext.h> | |
32 | #include <asm/cpu-features.h> | |
02416dcf | 33 | #include <asm/war.h> |
1da177e4 LT |
34 | |
35 | #include "signal-common.h" | |
36 | ||
66680583 RB |
37 | /* |
38 | * Horribly complicated - with the bloody RM9000 workarounds enabled | |
39 | * the signal trampolines is moving to the end of the structure so we can | |
40 | * increase the alignment without breaking software compatibility. | |
41 | */ | |
c0b9bae9 FBH |
42 | #if ICACHE_REFILLS_WORKAROUND_WAR == 0 |
43 | ||
66680583 RB |
44 | struct sigframe { |
45 | u32 sf_ass[4]; /* argument save space for o32 */ | |
46 | u32 sf_code[2]; /* signal trampoline */ | |
47 | struct sigcontext sf_sc; | |
48 | sigset_t sf_mask; | |
49 | }; | |
50 | ||
c0b9bae9 FBH |
51 | struct rt_sigframe { |
52 | u32 rs_ass[4]; /* argument save space for o32 */ | |
53 | u32 rs_code[2]; /* signal trampoline */ | |
54 | struct siginfo rs_info; | |
55 | struct ucontext rs_uc; | |
56 | }; | |
57 | ||
58 | #else | |
59 | ||
66680583 RB |
60 | struct sigframe { |
61 | u32 sf_ass[4]; /* argument save space for o32 */ | |
62 | u32 sf_pad[2]; | |
63 | struct sigcontext sf_sc; /* hw context */ | |
64 | sigset_t sf_mask; | |
65 | u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */ | |
66 | }; | |
67 | ||
c0b9bae9 FBH |
68 | struct rt_sigframe { |
69 | u32 rs_ass[4]; /* argument save space for o32 */ | |
70 | u32 rs_pad[2]; | |
71 | struct siginfo rs_info; | |
72 | struct ucontext rs_uc; | |
73 | u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */ | |
74 | }; | |
75 | ||
76 | #endif | |
77 | ||
c3fc4ab3 FBH |
78 | /* |
79 | * Helper routines | |
80 | */ | |
81 | int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) | |
82 | { | |
83 | int err = 0; | |
84 | int i; | |
85 | ||
86 | err |= __put_user(regs->cp0_epc, &sc->sc_pc); | |
87 | ||
88 | err |= __put_user(0, &sc->sc_regs[0]); | |
89 | for (i = 1; i < 32; i++) | |
90 | err |= __put_user(regs->regs[i], &sc->sc_regs[i]); | |
91 | ||
9693a853 FBH |
92 | #ifdef CONFIG_CPU_HAS_SMARTMIPS |
93 | err |= __put_user(regs->acx, &sc->sc_acx); | |
94 | #endif | |
c3fc4ab3 FBH |
95 | err |= __put_user(regs->hi, &sc->sc_mdhi); |
96 | err |= __put_user(regs->lo, &sc->sc_mdlo); | |
97 | if (cpu_has_dsp) { | |
98 | err |= __put_user(mfhi1(), &sc->sc_hi1); | |
99 | err |= __put_user(mflo1(), &sc->sc_lo1); | |
100 | err |= __put_user(mfhi2(), &sc->sc_hi2); | |
101 | err |= __put_user(mflo2(), &sc->sc_lo2); | |
102 | err |= __put_user(mfhi3(), &sc->sc_hi3); | |
103 | err |= __put_user(mflo3(), &sc->sc_lo3); | |
104 | err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); | |
105 | } | |
106 | ||
107 | err |= __put_user(!!used_math(), &sc->sc_used_math); | |
108 | ||
109 | if (used_math()) { | |
110 | /* | |
111 | * Save FPU state to signal context. Signal handler | |
112 | * will "inherit" current FPU state. | |
113 | */ | |
114 | preempt_disable(); | |
115 | ||
116 | if (!is_fpu_owner()) { | |
117 | own_fpu(); | |
118 | restore_fp(current); | |
119 | } | |
120 | err |= save_fp_context(sc); | |
121 | ||
122 | preempt_enable(); | |
123 | } | |
124 | return err; | |
125 | } | |
126 | ||
127 | int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) | |
128 | { | |
129 | unsigned int used_math; | |
130 | unsigned long treg; | |
131 | int err = 0; | |
132 | int i; | |
133 | ||
134 | /* Always make any pending restarted system calls return -EINTR */ | |
135 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
136 | ||
137 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); | |
9693a853 FBH |
138 | |
139 | #ifdef CONFIG_CPU_HAS_SMARTMIPS | |
140 | err |= __get_user(regs->acx, &sc->sc_acx); | |
141 | #endif | |
c3fc4ab3 FBH |
142 | err |= __get_user(regs->hi, &sc->sc_mdhi); |
143 | err |= __get_user(regs->lo, &sc->sc_mdlo); | |
144 | if (cpu_has_dsp) { | |
145 | err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); | |
146 | err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); | |
147 | err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); | |
148 | err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); | |
149 | err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); | |
150 | err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); | |
151 | err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); | |
152 | } | |
153 | ||
154 | for (i = 1; i < 32; i++) | |
155 | err |= __get_user(regs->regs[i], &sc->sc_regs[i]); | |
156 | ||
157 | err |= __get_user(used_math, &sc->sc_used_math); | |
158 | conditional_used_math(used_math); | |
159 | ||
160 | preempt_disable(); | |
161 | ||
162 | if (used_math()) { | |
163 | /* restore fpu context if we have used it before */ | |
164 | own_fpu(); | |
165 | err |= restore_fp_context(sc); | |
166 | } else { | |
167 | /* signal handler may have used FPU. Give it up. */ | |
168 | lose_fpu(); | |
169 | } | |
170 | ||
171 | preempt_enable(); | |
172 | ||
173 | return err; | |
174 | } | |
175 | ||
176 | void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, | |
177 | size_t frame_size) | |
178 | { | |
179 | unsigned long sp; | |
180 | ||
181 | /* Default to using normal stack */ | |
182 | sp = regs->regs[29]; | |
183 | ||
184 | /* | |
185 | * FPU emulator may have it's own trampoline active just | |
186 | * above the user stack, 16-bytes before the next lowest | |
187 | * 16 byte boundary. Try to avoid trashing it. | |
188 | */ | |
189 | sp -= 32; | |
190 | ||
191 | /* This is the X/Open sanctioned signal stack switching. */ | |
192 | if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0)) | |
193 | sp = current->sas_ss_sp + current->sas_ss_size; | |
194 | ||
195 | return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK)); | |
196 | } | |
197 | ||
198 | int install_sigtramp(unsigned int __user *tramp, unsigned int syscall) | |
199 | { | |
200 | int err; | |
201 | ||
202 | /* | |
203 | * Set up the return code ... | |
204 | * | |
205 | * li v0, __NR__foo_sigreturn | |
206 | * syscall | |
207 | */ | |
208 | ||
209 | err = __put_user(0x24020000 + syscall, tramp + 0); | |
601dde45 | 210 | err |= __put_user(0x0000000c , tramp + 1); |
c3fc4ab3 FBH |
211 | if (ICACHE_REFILLS_WORKAROUND_WAR) { |
212 | err |= __put_user(0, tramp + 2); | |
213 | err |= __put_user(0, tramp + 3); | |
214 | err |= __put_user(0, tramp + 4); | |
215 | err |= __put_user(0, tramp + 5); | |
216 | err |= __put_user(0, tramp + 6); | |
217 | err |= __put_user(0, tramp + 7); | |
218 | } | |
219 | flush_cache_sigtramp((unsigned long) tramp); | |
220 | ||
221 | return err; | |
222 | } | |
223 | ||
1da177e4 LT |
224 | /* |
225 | * Atomically swap in the new signal mask, and wait for a signal. | |
226 | */ | |
227 | ||
228 | #ifdef CONFIG_TRAD_SIGNALS | |
f90080a0 | 229 | asmlinkage int sys_sigsuspend(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 230 | { |
7b3e2fc8 | 231 | sigset_t newset; |
fe00f943 | 232 | sigset_t __user *uset; |
1da177e4 | 233 | |
fe00f943 | 234 | uset = (sigset_t __user *) regs.regs[4]; |
1da177e4 LT |
235 | if (copy_from_user(&newset, uset, sizeof(sigset_t))) |
236 | return -EFAULT; | |
237 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
238 | ||
239 | spin_lock_irq(¤t->sighand->siglock); | |
7b3e2fc8 | 240 | current->saved_sigmask = current->blocked; |
1da177e4 LT |
241 | current->blocked = newset; |
242 | recalc_sigpending(); | |
243 | spin_unlock_irq(¤t->sighand->siglock); | |
244 | ||
7b3e2fc8 RB |
245 | current->state = TASK_INTERRUPTIBLE; |
246 | schedule(); | |
247 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
248 | return -ERESTARTNOHAND; | |
1da177e4 LT |
249 | } |
250 | #endif | |
251 | ||
f90080a0 | 252 | asmlinkage int sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 253 | { |
7b3e2fc8 | 254 | sigset_t newset; |
fe00f943 | 255 | sigset_t __user *unewset; |
1da177e4 LT |
256 | size_t sigsetsize; |
257 | ||
258 | /* XXX Don't preclude handling different sized sigset_t's. */ | |
259 | sigsetsize = regs.regs[5]; | |
260 | if (sigsetsize != sizeof(sigset_t)) | |
261 | return -EINVAL; | |
262 | ||
fe00f943 | 263 | unewset = (sigset_t __user *) regs.regs[4]; |
1da177e4 LT |
264 | if (copy_from_user(&newset, unewset, sizeof(newset))) |
265 | return -EFAULT; | |
266 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
267 | ||
268 | spin_lock_irq(¤t->sighand->siglock); | |
7b3e2fc8 | 269 | current->saved_sigmask = current->blocked; |
1da177e4 | 270 | current->blocked = newset; |
e0daad44 | 271 | recalc_sigpending(); |
1da177e4 LT |
272 | spin_unlock_irq(¤t->sighand->siglock); |
273 | ||
7b3e2fc8 RB |
274 | current->state = TASK_INTERRUPTIBLE; |
275 | schedule(); | |
276 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
277 | return -ERESTARTNOHAND; | |
1da177e4 LT |
278 | } |
279 | ||
280 | #ifdef CONFIG_TRAD_SIGNALS | |
9c6031cc AN |
281 | asmlinkage int sys_sigaction(int sig, const struct sigaction __user *act, |
282 | struct sigaction __user *oact) | |
1da177e4 LT |
283 | { |
284 | struct k_sigaction new_ka, old_ka; | |
285 | int ret; | |
286 | int err = 0; | |
287 | ||
288 | if (act) { | |
289 | old_sigset_t mask; | |
290 | ||
291 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
292 | return -EFAULT; | |
293 | err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler); | |
294 | err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
295 | err |= __get_user(mask, &act->sa_mask.sig[0]); | |
296 | if (err) | |
297 | return -EFAULT; | |
298 | ||
299 | siginitset(&new_ka.sa.sa_mask, mask); | |
300 | } | |
301 | ||
302 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
303 | ||
304 | if (!ret && oact) { | |
305 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
e0daad44 | 306 | return -EFAULT; |
1da177e4 LT |
307 | err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
308 | err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler); | |
309 | err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); | |
310 | err |= __put_user(0, &oact->sa_mask.sig[1]); | |
311 | err |= __put_user(0, &oact->sa_mask.sig[2]); | |
312 | err |= __put_user(0, &oact->sa_mask.sig[3]); | |
313 | if (err) | |
314 | return -EFAULT; | |
315 | } | |
316 | ||
317 | return ret; | |
318 | } | |
319 | #endif | |
320 | ||
321 | asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs) | |
322 | { | |
fe00f943 RB |
323 | const stack_t __user *uss = (const stack_t __user *) regs.regs[4]; |
324 | stack_t __user *uoss = (stack_t __user *) regs.regs[5]; | |
1da177e4 LT |
325 | unsigned long usp = regs.regs[29]; |
326 | ||
327 | return do_sigaltstack(uss, uoss, usp); | |
328 | } | |
329 | ||
1da177e4 | 330 | #ifdef CONFIG_TRAD_SIGNALS |
f90080a0 | 331 | asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 332 | { |
9bbf28a3 | 333 | struct sigframe __user *frame; |
1da177e4 LT |
334 | sigset_t blocked; |
335 | ||
9bbf28a3 | 336 | frame = (struct sigframe __user *) regs.regs[29]; |
1da177e4 LT |
337 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
338 | goto badframe; | |
339 | if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked))) | |
340 | goto badframe; | |
341 | ||
342 | sigdelsetmask(&blocked, ~_BLOCKABLE); | |
343 | spin_lock_irq(¤t->sighand->siglock); | |
344 | current->blocked = blocked; | |
345 | recalc_sigpending(); | |
346 | spin_unlock_irq(¤t->sighand->siglock); | |
347 | ||
348 | if (restore_sigcontext(®s, &frame->sf_sc)) | |
349 | goto badframe; | |
350 | ||
351 | /* | |
352 | * Don't let your children do this ... | |
353 | */ | |
1da177e4 LT |
354 | __asm__ __volatile__( |
355 | "move\t$29, %0\n\t" | |
356 | "j\tsyscall_exit" | |
357 | :/* no outputs */ | |
358 | :"r" (®s)); | |
359 | /* Unreached */ | |
360 | ||
361 | badframe: | |
362 | force_sig(SIGSEGV, current); | |
363 | } | |
e50c0a8f | 364 | #endif /* CONFIG_TRAD_SIGNALS */ |
1da177e4 | 365 | |
f90080a0 | 366 | asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 367 | { |
9bbf28a3 | 368 | struct rt_sigframe __user *frame; |
1da177e4 LT |
369 | sigset_t set; |
370 | stack_t st; | |
371 | ||
9bbf28a3 | 372 | frame = (struct rt_sigframe __user *) regs.regs[29]; |
1da177e4 LT |
373 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
374 | goto badframe; | |
375 | if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) | |
376 | goto badframe; | |
377 | ||
378 | sigdelsetmask(&set, ~_BLOCKABLE); | |
379 | spin_lock_irq(¤t->sighand->siglock); | |
380 | current->blocked = set; | |
381 | recalc_sigpending(); | |
382 | spin_unlock_irq(¤t->sighand->siglock); | |
383 | ||
384 | if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext)) | |
385 | goto badframe; | |
386 | ||
387 | if (__copy_from_user(&st, &frame->rs_uc.uc_stack, sizeof(st))) | |
388 | goto badframe; | |
389 | /* It is more difficult to avoid calling this function than to | |
390 | call it and ignore errors. */ | |
9bbf28a3 | 391 | do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]); |
1da177e4 LT |
392 | |
393 | /* | |
394 | * Don't let your children do this ... | |
395 | */ | |
396 | __asm__ __volatile__( | |
397 | "move\t$29, %0\n\t" | |
398 | "j\tsyscall_exit" | |
399 | :/* no outputs */ | |
400 | :"r" (®s)); | |
401 | /* Unreached */ | |
402 | ||
403 | badframe: | |
404 | force_sig(SIGSEGV, current); | |
405 | } | |
406 | ||
407 | #ifdef CONFIG_TRAD_SIGNALS | |
151fd6ac | 408 | static int setup_frame(struct k_sigaction * ka, struct pt_regs *regs, |
1da177e4 LT |
409 | int signr, sigset_t *set) |
410 | { | |
9bbf28a3 | 411 | struct sigframe __user *frame; |
1da177e4 LT |
412 | int err = 0; |
413 | ||
414 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
415 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
416 | goto give_sigsegv; | |
417 | ||
601dde45 | 418 | err |= install_sigtramp(frame->sf_code, __NR_sigreturn); |
1da177e4 LT |
419 | |
420 | err |= setup_sigcontext(regs, &frame->sf_sc); | |
421 | err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set)); | |
422 | if (err) | |
423 | goto give_sigsegv; | |
424 | ||
425 | /* | |
426 | * Arguments to signal handler: | |
427 | * | |
428 | * a0 = signal number | |
429 | * a1 = 0 (should be cause) | |
430 | * a2 = pointer to struct sigcontext | |
431 | * | |
432 | * $25 and c0_epc point to the signal handler, $29 points to the | |
433 | * struct sigframe. | |
434 | */ | |
435 | regs->regs[ 4] = signr; | |
436 | regs->regs[ 5] = 0; | |
437 | regs->regs[ 6] = (unsigned long) &frame->sf_sc; | |
438 | regs->regs[29] = (unsigned long) frame; | |
439 | regs->regs[31] = (unsigned long) frame->sf_code; | |
440 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; | |
441 | ||
722bb63d | 442 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 | 443 | current->comm, current->pid, |
722bb63d | 444 | frame, regs->cp0_epc, regs->regs[31]); |
e0daad44 | 445 | return 0; |
1da177e4 LT |
446 | |
447 | give_sigsegv: | |
448 | force_sigsegv(signr, current); | |
7b3e2fc8 | 449 | return -EFAULT; |
1da177e4 LT |
450 | } |
451 | #endif | |
452 | ||
151fd6ac | 453 | static int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs, |
1da177e4 LT |
454 | int signr, sigset_t *set, siginfo_t *info) |
455 | { | |
9bbf28a3 | 456 | struct rt_sigframe __user *frame; |
1da177e4 LT |
457 | int err = 0; |
458 | ||
459 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
460 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
461 | goto give_sigsegv; | |
462 | ||
601dde45 | 463 | err |= install_sigtramp(frame->rs_code, __NR_rt_sigreturn); |
1da177e4 LT |
464 | |
465 | /* Create siginfo. */ | |
466 | err |= copy_siginfo_to_user(&frame->rs_info, info); | |
467 | ||
468 | /* Create the ucontext. */ | |
469 | err |= __put_user(0, &frame->rs_uc.uc_flags); | |
5665a0ac | 470 | err |= __put_user(NULL, &frame->rs_uc.uc_link); |
9c6031cc | 471 | err |= __put_user((void __user *)current->sas_ss_sp, |
1da177e4 LT |
472 | &frame->rs_uc.uc_stack.ss_sp); |
473 | err |= __put_user(sas_ss_flags(regs->regs[29]), | |
474 | &frame->rs_uc.uc_stack.ss_flags); | |
475 | err |= __put_user(current->sas_ss_size, | |
476 | &frame->rs_uc.uc_stack.ss_size); | |
477 | err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); | |
478 | err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); | |
479 | ||
480 | if (err) | |
481 | goto give_sigsegv; | |
482 | ||
483 | /* | |
484 | * Arguments to signal handler: | |
485 | * | |
486 | * a0 = signal number | |
487 | * a1 = 0 (should be cause) | |
488 | * a2 = pointer to ucontext | |
489 | * | |
490 | * $25 and c0_epc point to the signal handler, $29 points to | |
491 | * the struct rt_sigframe. | |
492 | */ | |
493 | regs->regs[ 4] = signr; | |
494 | regs->regs[ 5] = (unsigned long) &frame->rs_info; | |
495 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
496 | regs->regs[29] = (unsigned long) frame; | |
497 | regs->regs[31] = (unsigned long) frame->rs_code; | |
498 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; | |
499 | ||
722bb63d | 500 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 LT |
501 | current->comm, current->pid, |
502 | frame, regs->cp0_epc, regs->regs[31]); | |
722bb63d | 503 | |
7b3e2fc8 | 504 | return 0; |
1da177e4 LT |
505 | |
506 | give_sigsegv: | |
507 | force_sigsegv(signr, current); | |
7b3e2fc8 | 508 | return -EFAULT; |
1da177e4 LT |
509 | } |
510 | ||
151fd6ac RB |
511 | struct mips_abi mips_abi = { |
512 | #ifdef CONFIG_TRAD_SIGNALS | |
513 | .setup_frame = setup_frame, | |
514 | #endif | |
515 | .setup_rt_frame = setup_rt_frame, | |
516 | .restart = __NR_restart_syscall | |
517 | }; | |
518 | ||
e692eb30 | 519 | static int handle_signal(unsigned long sig, siginfo_t *info, |
1da177e4 LT |
520 | struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs) |
521 | { | |
129bc8f7 RB |
522 | int ret; |
523 | ||
1da177e4 LT |
524 | switch(regs->regs[0]) { |
525 | case ERESTART_RESTARTBLOCK: | |
526 | case ERESTARTNOHAND: | |
527 | regs->regs[2] = EINTR; | |
528 | break; | |
529 | case ERESTARTSYS: | |
7b3e2fc8 | 530 | if (!(ka->sa.sa_flags & SA_RESTART)) { |
1da177e4 LT |
531 | regs->regs[2] = EINTR; |
532 | break; | |
533 | } | |
534 | /* fallthrough */ | |
535 | case ERESTARTNOINTR: /* Userland will reload $v0. */ | |
536 | regs->regs[7] = regs->regs[26]; | |
537 | regs->cp0_epc -= 8; | |
538 | } | |
539 | ||
540 | regs->regs[0] = 0; /* Don't deal with this again. */ | |
541 | ||
e50c0a8f | 542 | if (sig_uses_siginfo(ka)) |
129bc8f7 | 543 | ret = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info); |
1da177e4 | 544 | else |
129bc8f7 | 545 | ret = current->thread.abi->setup_frame(ka, regs, sig, oldset); |
1da177e4 | 546 | |
69be8f18 SR |
547 | spin_lock_irq(¤t->sighand->siglock); |
548 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
549 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
1da177e4 | 550 | sigaddset(¤t->blocked,sig); |
69be8f18 SR |
551 | recalc_sigpending(); |
552 | spin_unlock_irq(¤t->sighand->siglock); | |
129bc8f7 RB |
553 | |
554 | return ret; | |
1da177e4 LT |
555 | } |
556 | ||
151fd6ac | 557 | static void do_signal(struct pt_regs *regs) |
1da177e4 LT |
558 | { |
559 | struct k_sigaction ka; | |
7b3e2fc8 | 560 | sigset_t *oldset; |
1da177e4 LT |
561 | siginfo_t info; |
562 | int signr; | |
563 | ||
1da177e4 LT |
564 | /* |
565 | * We want the common case to go fast, which is why we may in certain | |
566 | * cases get here from kernel mode. Just return without doing anything | |
567 | * if so. | |
568 | */ | |
569 | if (!user_mode(regs)) | |
40ac5d47 | 570 | return; |
1da177e4 | 571 | |
7b3e2fc8 RB |
572 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
573 | oldset = ¤t->saved_sigmask; | |
574 | else | |
1da177e4 LT |
575 | oldset = ¤t->blocked; |
576 | ||
577 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
7b3e2fc8 RB |
578 | if (signr > 0) { |
579 | /* Whee! Actually deliver the signal. */ | |
580 | if (handle_signal(signr, &info, &ka, oldset, regs) == 0) { | |
581 | /* | |
582 | * A signal was successfully delivered; the saved | |
583 | * sigmask will have been stored in the signal frame, | |
584 | * and will be restored by sigreturn, so we can simply | |
585 | * clear the TIF_RESTORE_SIGMASK flag. | |
586 | */ | |
587 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
588 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
589 | } | |
45887e12 RB |
590 | |
591 | return; | |
7b3e2fc8 | 592 | } |
1da177e4 | 593 | |
1da177e4 LT |
594 | /* |
595 | * Who's code doesn't conform to the restartable syscall convention | |
596 | * dies here!!! The li instruction, a single machine instruction, | |
597 | * must directly be followed by the syscall instruction. | |
598 | */ | |
599 | if (regs->regs[0]) { | |
600 | if (regs->regs[2] == ERESTARTNOHAND || | |
601 | regs->regs[2] == ERESTARTSYS || | |
602 | regs->regs[2] == ERESTARTNOINTR) { | |
603 | regs->regs[7] = regs->regs[26]; | |
604 | regs->cp0_epc -= 8; | |
605 | } | |
606 | if (regs->regs[2] == ERESTART_RESTARTBLOCK) { | |
151fd6ac | 607 | regs->regs[2] = current->thread.abi->restart; |
1da177e4 LT |
608 | regs->regs[7] = regs->regs[26]; |
609 | regs->cp0_epc -= 4; | |
610 | } | |
13fdd31a | 611 | regs->regs[0] = 0; /* Don't deal with this again. */ |
1da177e4 | 612 | } |
7b3e2fc8 RB |
613 | |
614 | /* | |
615 | * If there's no signal to deliver, we just put the saved sigmask | |
616 | * back | |
617 | */ | |
618 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
619 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
620 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
621 | } | |
1da177e4 LT |
622 | } |
623 | ||
624 | /* | |
625 | * notification of userspace execution resumption | |
7b3e2fc8 | 626 | * - triggered by the TIF_WORK_MASK flags |
1da177e4 | 627 | */ |
7b3e2fc8 | 628 | asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, |
1da177e4 LT |
629 | __u32 thread_info_flags) |
630 | { | |
631 | /* deal with pending signal delivery */ | |
7b3e2fc8 | 632 | if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)) |
151fd6ac | 633 | do_signal(regs); |
1da177e4 | 634 | } |