Commit | Line | Data |
---|---|---|
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> | |
1da177e4 LT |
15 | #include <linux/kernel.h> |
16 | #include <linux/signal.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/wait.h> | |
19 | #include <linux/ptrace.h> | |
20 | #include <linux/unistd.h> | |
21 | #include <linux/compiler.h> | |
faea6234 | 22 | #include <linux/uaccess.h> |
1da177e4 | 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> | |
1da177e4 LT |
30 | #include <asm/ucontext.h> |
31 | #include <asm/cpu-features.h> | |
02416dcf | 32 | #include <asm/war.h> |
1da177e4 LT |
33 | |
34 | #include "signal-common.h" | |
35 | ||
66680583 RB |
36 | /* |
37 | * Horribly complicated - with the bloody RM9000 workarounds enabled | |
38 | * the signal trampolines is moving to the end of the structure so we can | |
39 | * increase the alignment without breaking software compatibility. | |
40 | */ | |
c0b9bae9 FBH |
41 | #if ICACHE_REFILLS_WORKAROUND_WAR == 0 |
42 | ||
66680583 RB |
43 | struct sigframe { |
44 | u32 sf_ass[4]; /* argument save space for o32 */ | |
45 | u32 sf_code[2]; /* signal trampoline */ | |
46 | struct sigcontext sf_sc; | |
47 | sigset_t sf_mask; | |
48 | }; | |
49 | ||
c0b9bae9 FBH |
50 | struct rt_sigframe { |
51 | u32 rs_ass[4]; /* argument save space for o32 */ | |
52 | u32 rs_code[2]; /* signal trampoline */ | |
53 | struct siginfo rs_info; | |
54 | struct ucontext rs_uc; | |
55 | }; | |
56 | ||
57 | #else | |
58 | ||
66680583 RB |
59 | struct sigframe { |
60 | u32 sf_ass[4]; /* argument save space for o32 */ | |
61 | u32 sf_pad[2]; | |
62 | struct sigcontext sf_sc; /* hw context */ | |
63 | sigset_t sf_mask; | |
64 | u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */ | |
65 | }; | |
66 | ||
c0b9bae9 FBH |
67 | struct rt_sigframe { |
68 | u32 rs_ass[4]; /* argument save space for o32 */ | |
69 | u32 rs_pad[2]; | |
70 | struct siginfo rs_info; | |
71 | struct ucontext rs_uc; | |
72 | u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */ | |
73 | }; | |
74 | ||
75 | #endif | |
76 | ||
c3fc4ab3 FBH |
77 | /* |
78 | * Helper routines | |
79 | */ | |
faea6234 AN |
80 | static int protected_save_fp_context(struct sigcontext __user *sc) |
81 | { | |
82 | int err; | |
83 | while (1) { | |
84 | lock_fpu_owner(); | |
85 | own_fpu_inatomic(1); | |
86 | err = save_fp_context(sc); /* this might fail */ | |
87 | unlock_fpu_owner(); | |
88 | if (likely(!err)) | |
89 | break; | |
90 | /* touch the sigcontext and try again */ | |
91 | err = __put_user(0, &sc->sc_fpregs[0]) | | |
92 | __put_user(0, &sc->sc_fpregs[31]) | | |
93 | __put_user(0, &sc->sc_fpc_csr); | |
94 | if (err) | |
95 | break; /* really bad sigcontext */ | |
96 | } | |
97 | return err; | |
98 | } | |
99 | ||
100 | static int protected_restore_fp_context(struct sigcontext __user *sc) | |
101 | { | |
102 | int err, tmp; | |
103 | while (1) { | |
104 | lock_fpu_owner(); | |
105 | own_fpu_inatomic(0); | |
106 | err = restore_fp_context(sc); /* this might fail */ | |
107 | unlock_fpu_owner(); | |
108 | if (likely(!err)) | |
109 | break; | |
110 | /* touch the sigcontext and try again */ | |
111 | err = __get_user(tmp, &sc->sc_fpregs[0]) | | |
112 | __get_user(tmp, &sc->sc_fpregs[31]) | | |
113 | __get_user(tmp, &sc->sc_fpc_csr); | |
114 | if (err) | |
115 | break; /* really bad sigcontext */ | |
116 | } | |
117 | return err; | |
118 | } | |
119 | ||
c3fc4ab3 FBH |
120 | int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
121 | { | |
122 | int err = 0; | |
123 | int i; | |
53dc8028 | 124 | unsigned int used_math; |
c3fc4ab3 FBH |
125 | |
126 | err |= __put_user(regs->cp0_epc, &sc->sc_pc); | |
127 | ||
128 | err |= __put_user(0, &sc->sc_regs[0]); | |
129 | for (i = 1; i < 32; i++) | |
130 | err |= __put_user(regs->regs[i], &sc->sc_regs[i]); | |
131 | ||
9693a853 FBH |
132 | #ifdef CONFIG_CPU_HAS_SMARTMIPS |
133 | err |= __put_user(regs->acx, &sc->sc_acx); | |
134 | #endif | |
c3fc4ab3 FBH |
135 | err |= __put_user(regs->hi, &sc->sc_mdhi); |
136 | err |= __put_user(regs->lo, &sc->sc_mdlo); | |
137 | if (cpu_has_dsp) { | |
138 | err |= __put_user(mfhi1(), &sc->sc_hi1); | |
139 | err |= __put_user(mflo1(), &sc->sc_lo1); | |
140 | err |= __put_user(mfhi2(), &sc->sc_hi2); | |
141 | err |= __put_user(mflo2(), &sc->sc_lo2); | |
142 | err |= __put_user(mfhi3(), &sc->sc_hi3); | |
143 | err |= __put_user(mflo3(), &sc->sc_lo3); | |
144 | err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); | |
145 | } | |
146 | ||
53dc8028 AN |
147 | used_math = !!used_math(); |
148 | err |= __put_user(used_math, &sc->sc_used_math); | |
c3fc4ab3 | 149 | |
53dc8028 | 150 | if (used_math) { |
c3fc4ab3 FBH |
151 | /* |
152 | * Save FPU state to signal context. Signal handler | |
153 | * will "inherit" current FPU state. | |
154 | */ | |
faea6234 | 155 | err |= protected_save_fp_context(sc); |
c3fc4ab3 FBH |
156 | } |
157 | return err; | |
158 | } | |
159 | ||
c6a2f467 AN |
160 | int fpcsr_pending(unsigned int __user *fpcsr) |
161 | { | |
162 | int err, sig = 0; | |
163 | unsigned int csr, enabled; | |
164 | ||
165 | err = __get_user(csr, fpcsr); | |
166 | enabled = FPU_CSR_UNI_X | ((csr & FPU_CSR_ALL_E) << 5); | |
167 | /* | |
168 | * If the signal handler set some FPU exceptions, clear it and | |
169 | * send SIGFPE. | |
170 | */ | |
171 | if (csr & enabled) { | |
172 | csr &= ~enabled; | |
173 | err |= __put_user(csr, fpcsr); | |
174 | sig = SIGFPE; | |
175 | } | |
176 | return err ?: sig; | |
177 | } | |
178 | ||
179 | static int | |
180 | check_and_restore_fp_context(struct sigcontext __user *sc) | |
181 | { | |
182 | int err, sig; | |
183 | ||
184 | err = sig = fpcsr_pending(&sc->sc_fpc_csr); | |
185 | if (err > 0) | |
186 | err = 0; | |
faea6234 | 187 | err |= protected_restore_fp_context(sc); |
c6a2f467 AN |
188 | return err ?: sig; |
189 | } | |
190 | ||
c3fc4ab3 FBH |
191 | int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
192 | { | |
193 | unsigned int used_math; | |
194 | unsigned long treg; | |
195 | int err = 0; | |
196 | int i; | |
197 | ||
198 | /* Always make any pending restarted system calls return -EINTR */ | |
199 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
200 | ||
201 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); | |
9693a853 FBH |
202 | |
203 | #ifdef CONFIG_CPU_HAS_SMARTMIPS | |
204 | err |= __get_user(regs->acx, &sc->sc_acx); | |
205 | #endif | |
c3fc4ab3 FBH |
206 | err |= __get_user(regs->hi, &sc->sc_mdhi); |
207 | err |= __get_user(regs->lo, &sc->sc_mdlo); | |
208 | if (cpu_has_dsp) { | |
209 | err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); | |
210 | err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); | |
211 | err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); | |
212 | err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); | |
213 | err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); | |
214 | err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); | |
215 | err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); | |
216 | } | |
217 | ||
218 | for (i = 1; i < 32; i++) | |
219 | err |= __get_user(regs->regs[i], &sc->sc_regs[i]); | |
220 | ||
221 | err |= __get_user(used_math, &sc->sc_used_math); | |
222 | conditional_used_math(used_math); | |
223 | ||
53dc8028 | 224 | if (used_math) { |
c3fc4ab3 | 225 | /* restore fpu context if we have used it before */ |
c6a2f467 AN |
226 | if (!err) |
227 | err = check_and_restore_fp_context(sc); | |
c3fc4ab3 FBH |
228 | } else { |
229 | /* signal handler may have used FPU. Give it up. */ | |
53dc8028 | 230 | lose_fpu(0); |
c3fc4ab3 FBH |
231 | } |
232 | ||
c3fc4ab3 FBH |
233 | return err; |
234 | } | |
235 | ||
236 | void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, | |
237 | size_t frame_size) | |
238 | { | |
239 | unsigned long sp; | |
240 | ||
241 | /* Default to using normal stack */ | |
242 | sp = regs->regs[29]; | |
243 | ||
244 | /* | |
245 | * FPU emulator may have it's own trampoline active just | |
246 | * above the user stack, 16-bytes before the next lowest | |
247 | * 16 byte boundary. Try to avoid trashing it. | |
248 | */ | |
249 | sp -= 32; | |
250 | ||
251 | /* This is the X/Open sanctioned signal stack switching. */ | |
252 | if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0)) | |
253 | sp = current->sas_ss_sp + current->sas_ss_size; | |
254 | ||
255 | return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK)); | |
256 | } | |
257 | ||
258 | int install_sigtramp(unsigned int __user *tramp, unsigned int syscall) | |
259 | { | |
260 | int err; | |
261 | ||
262 | /* | |
263 | * Set up the return code ... | |
264 | * | |
265 | * li v0, __NR__foo_sigreturn | |
266 | * syscall | |
267 | */ | |
268 | ||
269 | err = __put_user(0x24020000 + syscall, tramp + 0); | |
601dde45 | 270 | err |= __put_user(0x0000000c , tramp + 1); |
c3fc4ab3 FBH |
271 | if (ICACHE_REFILLS_WORKAROUND_WAR) { |
272 | err |= __put_user(0, tramp + 2); | |
273 | err |= __put_user(0, tramp + 3); | |
274 | err |= __put_user(0, tramp + 4); | |
275 | err |= __put_user(0, tramp + 5); | |
276 | err |= __put_user(0, tramp + 6); | |
277 | err |= __put_user(0, tramp + 7); | |
278 | } | |
279 | flush_cache_sigtramp((unsigned long) tramp); | |
280 | ||
281 | return err; | |
282 | } | |
283 | ||
1da177e4 LT |
284 | /* |
285 | * Atomically swap in the new signal mask, and wait for a signal. | |
286 | */ | |
287 | ||
288 | #ifdef CONFIG_TRAD_SIGNALS | |
f90080a0 | 289 | asmlinkage int sys_sigsuspend(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 290 | { |
7b3e2fc8 | 291 | sigset_t newset; |
fe00f943 | 292 | sigset_t __user *uset; |
1da177e4 | 293 | |
fe00f943 | 294 | uset = (sigset_t __user *) regs.regs[4]; |
1da177e4 LT |
295 | if (copy_from_user(&newset, uset, sizeof(sigset_t))) |
296 | return -EFAULT; | |
297 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
298 | ||
299 | spin_lock_irq(¤t->sighand->siglock); | |
7b3e2fc8 | 300 | current->saved_sigmask = current->blocked; |
1da177e4 LT |
301 | current->blocked = newset; |
302 | recalc_sigpending(); | |
303 | spin_unlock_irq(¤t->sighand->siglock); | |
304 | ||
7b3e2fc8 RB |
305 | current->state = TASK_INTERRUPTIBLE; |
306 | schedule(); | |
307 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
308 | return -ERESTARTNOHAND; | |
1da177e4 LT |
309 | } |
310 | #endif | |
311 | ||
f90080a0 | 312 | asmlinkage int sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 313 | { |
7b3e2fc8 | 314 | sigset_t newset; |
fe00f943 | 315 | sigset_t __user *unewset; |
1da177e4 LT |
316 | size_t sigsetsize; |
317 | ||
318 | /* XXX Don't preclude handling different sized sigset_t's. */ | |
319 | sigsetsize = regs.regs[5]; | |
320 | if (sigsetsize != sizeof(sigset_t)) | |
321 | return -EINVAL; | |
322 | ||
fe00f943 | 323 | unewset = (sigset_t __user *) regs.regs[4]; |
1da177e4 LT |
324 | if (copy_from_user(&newset, unewset, sizeof(newset))) |
325 | return -EFAULT; | |
326 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
327 | ||
328 | spin_lock_irq(¤t->sighand->siglock); | |
7b3e2fc8 | 329 | current->saved_sigmask = current->blocked; |
1da177e4 | 330 | current->blocked = newset; |
e0daad44 | 331 | recalc_sigpending(); |
1da177e4 LT |
332 | spin_unlock_irq(¤t->sighand->siglock); |
333 | ||
7b3e2fc8 RB |
334 | current->state = TASK_INTERRUPTIBLE; |
335 | schedule(); | |
336 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
337 | return -ERESTARTNOHAND; | |
1da177e4 LT |
338 | } |
339 | ||
340 | #ifdef CONFIG_TRAD_SIGNALS | |
9c6031cc AN |
341 | asmlinkage int sys_sigaction(int sig, const struct sigaction __user *act, |
342 | struct sigaction __user *oact) | |
1da177e4 LT |
343 | { |
344 | struct k_sigaction new_ka, old_ka; | |
345 | int ret; | |
346 | int err = 0; | |
347 | ||
348 | if (act) { | |
349 | old_sigset_t mask; | |
350 | ||
351 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
352 | return -EFAULT; | |
353 | err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler); | |
354 | err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
355 | err |= __get_user(mask, &act->sa_mask.sig[0]); | |
356 | if (err) | |
357 | return -EFAULT; | |
358 | ||
359 | siginitset(&new_ka.sa.sa_mask, mask); | |
360 | } | |
361 | ||
362 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
363 | ||
364 | if (!ret && oact) { | |
365 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
e0daad44 | 366 | return -EFAULT; |
1da177e4 LT |
367 | err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
368 | err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler); | |
369 | err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); | |
370 | err |= __put_user(0, &oact->sa_mask.sig[1]); | |
371 | err |= __put_user(0, &oact->sa_mask.sig[2]); | |
372 | err |= __put_user(0, &oact->sa_mask.sig[3]); | |
373 | if (err) | |
374 | return -EFAULT; | |
375 | } | |
376 | ||
377 | return ret; | |
378 | } | |
379 | #endif | |
380 | ||
381 | asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs) | |
382 | { | |
fe00f943 RB |
383 | const stack_t __user *uss = (const stack_t __user *) regs.regs[4]; |
384 | stack_t __user *uoss = (stack_t __user *) regs.regs[5]; | |
1da177e4 LT |
385 | unsigned long usp = regs.regs[29]; |
386 | ||
387 | return do_sigaltstack(uss, uoss, usp); | |
388 | } | |
389 | ||
1da177e4 | 390 | #ifdef CONFIG_TRAD_SIGNALS |
f90080a0 | 391 | asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 392 | { |
9bbf28a3 | 393 | struct sigframe __user *frame; |
1da177e4 | 394 | sigset_t blocked; |
c6a2f467 | 395 | int sig; |
1da177e4 | 396 | |
9bbf28a3 | 397 | frame = (struct sigframe __user *) regs.regs[29]; |
1da177e4 LT |
398 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
399 | goto badframe; | |
400 | if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked))) | |
401 | goto badframe; | |
402 | ||
403 | sigdelsetmask(&blocked, ~_BLOCKABLE); | |
404 | spin_lock_irq(¤t->sighand->siglock); | |
405 | current->blocked = blocked; | |
406 | recalc_sigpending(); | |
407 | spin_unlock_irq(¤t->sighand->siglock); | |
408 | ||
c6a2f467 AN |
409 | sig = restore_sigcontext(®s, &frame->sf_sc); |
410 | if (sig < 0) | |
1da177e4 | 411 | goto badframe; |
c6a2f467 AN |
412 | else if (sig) |
413 | force_sig(sig, current); | |
1da177e4 LT |
414 | |
415 | /* | |
416 | * Don't let your children do this ... | |
417 | */ | |
1da177e4 LT |
418 | __asm__ __volatile__( |
419 | "move\t$29, %0\n\t" | |
420 | "j\tsyscall_exit" | |
421 | :/* no outputs */ | |
422 | :"r" (®s)); | |
423 | /* Unreached */ | |
424 | ||
425 | badframe: | |
426 | force_sig(SIGSEGV, current); | |
427 | } | |
e50c0a8f | 428 | #endif /* CONFIG_TRAD_SIGNALS */ |
1da177e4 | 429 | |
f90080a0 | 430 | asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 431 | { |
9bbf28a3 | 432 | struct rt_sigframe __user *frame; |
1da177e4 LT |
433 | sigset_t set; |
434 | stack_t st; | |
c6a2f467 | 435 | int sig; |
1da177e4 | 436 | |
9bbf28a3 | 437 | frame = (struct rt_sigframe __user *) regs.regs[29]; |
1da177e4 LT |
438 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
439 | goto badframe; | |
440 | if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) | |
441 | goto badframe; | |
442 | ||
443 | sigdelsetmask(&set, ~_BLOCKABLE); | |
444 | spin_lock_irq(¤t->sighand->siglock); | |
445 | current->blocked = set; | |
446 | recalc_sigpending(); | |
447 | spin_unlock_irq(¤t->sighand->siglock); | |
448 | ||
c6a2f467 AN |
449 | sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext); |
450 | if (sig < 0) | |
1da177e4 | 451 | goto badframe; |
c6a2f467 AN |
452 | else if (sig) |
453 | force_sig(sig, current); | |
1da177e4 LT |
454 | |
455 | if (__copy_from_user(&st, &frame->rs_uc.uc_stack, sizeof(st))) | |
456 | goto badframe; | |
457 | /* It is more difficult to avoid calling this function than to | |
458 | call it and ignore errors. */ | |
9bbf28a3 | 459 | do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]); |
1da177e4 LT |
460 | |
461 | /* | |
462 | * Don't let your children do this ... | |
463 | */ | |
464 | __asm__ __volatile__( | |
465 | "move\t$29, %0\n\t" | |
466 | "j\tsyscall_exit" | |
467 | :/* no outputs */ | |
468 | :"r" (®s)); | |
469 | /* Unreached */ | |
470 | ||
471 | badframe: | |
472 | force_sig(SIGSEGV, current); | |
473 | } | |
474 | ||
475 | #ifdef CONFIG_TRAD_SIGNALS | |
151fd6ac | 476 | static int setup_frame(struct k_sigaction * ka, struct pt_regs *regs, |
1da177e4 LT |
477 | int signr, sigset_t *set) |
478 | { | |
9bbf28a3 | 479 | struct sigframe __user *frame; |
1da177e4 LT |
480 | int err = 0; |
481 | ||
482 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
483 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
484 | goto give_sigsegv; | |
485 | ||
601dde45 | 486 | err |= install_sigtramp(frame->sf_code, __NR_sigreturn); |
1da177e4 LT |
487 | |
488 | err |= setup_sigcontext(regs, &frame->sf_sc); | |
489 | err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set)); | |
490 | if (err) | |
491 | goto give_sigsegv; | |
492 | ||
493 | /* | |
494 | * Arguments to signal handler: | |
495 | * | |
496 | * a0 = signal number | |
497 | * a1 = 0 (should be cause) | |
498 | * a2 = pointer to struct sigcontext | |
499 | * | |
500 | * $25 and c0_epc point to the signal handler, $29 points to the | |
501 | * struct sigframe. | |
502 | */ | |
503 | regs->regs[ 4] = signr; | |
504 | regs->regs[ 5] = 0; | |
505 | regs->regs[ 6] = (unsigned long) &frame->sf_sc; | |
506 | regs->regs[29] = (unsigned long) frame; | |
507 | regs->regs[31] = (unsigned long) frame->sf_code; | |
508 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; | |
509 | ||
722bb63d | 510 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 | 511 | current->comm, current->pid, |
722bb63d | 512 | frame, regs->cp0_epc, regs->regs[31]); |
e0daad44 | 513 | return 0; |
1da177e4 LT |
514 | |
515 | give_sigsegv: | |
516 | force_sigsegv(signr, current); | |
7b3e2fc8 | 517 | return -EFAULT; |
1da177e4 LT |
518 | } |
519 | #endif | |
520 | ||
151fd6ac | 521 | static int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs, |
1da177e4 LT |
522 | int signr, sigset_t *set, siginfo_t *info) |
523 | { | |
9bbf28a3 | 524 | struct rt_sigframe __user *frame; |
1da177e4 LT |
525 | int err = 0; |
526 | ||
527 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
528 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
529 | goto give_sigsegv; | |
530 | ||
601dde45 | 531 | err |= install_sigtramp(frame->rs_code, __NR_rt_sigreturn); |
1da177e4 LT |
532 | |
533 | /* Create siginfo. */ | |
534 | err |= copy_siginfo_to_user(&frame->rs_info, info); | |
535 | ||
536 | /* Create the ucontext. */ | |
537 | err |= __put_user(0, &frame->rs_uc.uc_flags); | |
5665a0ac | 538 | err |= __put_user(NULL, &frame->rs_uc.uc_link); |
9c6031cc | 539 | err |= __put_user((void __user *)current->sas_ss_sp, |
1da177e4 LT |
540 | &frame->rs_uc.uc_stack.ss_sp); |
541 | err |= __put_user(sas_ss_flags(regs->regs[29]), | |
542 | &frame->rs_uc.uc_stack.ss_flags); | |
543 | err |= __put_user(current->sas_ss_size, | |
544 | &frame->rs_uc.uc_stack.ss_size); | |
545 | err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); | |
546 | err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); | |
547 | ||
548 | if (err) | |
549 | goto give_sigsegv; | |
550 | ||
551 | /* | |
552 | * Arguments to signal handler: | |
553 | * | |
554 | * a0 = signal number | |
555 | * a1 = 0 (should be cause) | |
556 | * a2 = pointer to ucontext | |
557 | * | |
558 | * $25 and c0_epc point to the signal handler, $29 points to | |
559 | * the struct rt_sigframe. | |
560 | */ | |
561 | regs->regs[ 4] = signr; | |
562 | regs->regs[ 5] = (unsigned long) &frame->rs_info; | |
563 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
564 | regs->regs[29] = (unsigned long) frame; | |
565 | regs->regs[31] = (unsigned long) frame->rs_code; | |
566 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; | |
567 | ||
722bb63d | 568 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 LT |
569 | current->comm, current->pid, |
570 | frame, regs->cp0_epc, regs->regs[31]); | |
722bb63d | 571 | |
7b3e2fc8 | 572 | return 0; |
1da177e4 LT |
573 | |
574 | give_sigsegv: | |
575 | force_sigsegv(signr, current); | |
7b3e2fc8 | 576 | return -EFAULT; |
1da177e4 LT |
577 | } |
578 | ||
151fd6ac RB |
579 | struct mips_abi mips_abi = { |
580 | #ifdef CONFIG_TRAD_SIGNALS | |
581 | .setup_frame = setup_frame, | |
582 | #endif | |
583 | .setup_rt_frame = setup_rt_frame, | |
584 | .restart = __NR_restart_syscall | |
585 | }; | |
586 | ||
e692eb30 | 587 | static int handle_signal(unsigned long sig, siginfo_t *info, |
1da177e4 LT |
588 | struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs) |
589 | { | |
129bc8f7 RB |
590 | int ret; |
591 | ||
1da177e4 LT |
592 | switch(regs->regs[0]) { |
593 | case ERESTART_RESTARTBLOCK: | |
594 | case ERESTARTNOHAND: | |
595 | regs->regs[2] = EINTR; | |
596 | break; | |
597 | case ERESTARTSYS: | |
7b3e2fc8 | 598 | if (!(ka->sa.sa_flags & SA_RESTART)) { |
1da177e4 LT |
599 | regs->regs[2] = EINTR; |
600 | break; | |
601 | } | |
602 | /* fallthrough */ | |
603 | case ERESTARTNOINTR: /* Userland will reload $v0. */ | |
604 | regs->regs[7] = regs->regs[26]; | |
605 | regs->cp0_epc -= 8; | |
606 | } | |
607 | ||
608 | regs->regs[0] = 0; /* Don't deal with this again. */ | |
609 | ||
e50c0a8f | 610 | if (sig_uses_siginfo(ka)) |
129bc8f7 | 611 | ret = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info); |
1da177e4 | 612 | else |
129bc8f7 | 613 | ret = current->thread.abi->setup_frame(ka, regs, sig, oldset); |
1da177e4 | 614 | |
69be8f18 SR |
615 | spin_lock_irq(¤t->sighand->siglock); |
616 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); | |
617 | if (!(ka->sa.sa_flags & SA_NODEFER)) | |
1da177e4 | 618 | sigaddset(¤t->blocked,sig); |
69be8f18 SR |
619 | recalc_sigpending(); |
620 | spin_unlock_irq(¤t->sighand->siglock); | |
129bc8f7 RB |
621 | |
622 | return ret; | |
1da177e4 LT |
623 | } |
624 | ||
151fd6ac | 625 | static void do_signal(struct pt_regs *regs) |
1da177e4 LT |
626 | { |
627 | struct k_sigaction ka; | |
7b3e2fc8 | 628 | sigset_t *oldset; |
1da177e4 LT |
629 | siginfo_t info; |
630 | int signr; | |
631 | ||
1da177e4 LT |
632 | /* |
633 | * We want the common case to go fast, which is why we may in certain | |
634 | * cases get here from kernel mode. Just return without doing anything | |
635 | * if so. | |
636 | */ | |
637 | if (!user_mode(regs)) | |
40ac5d47 | 638 | return; |
1da177e4 | 639 | |
7b3e2fc8 RB |
640 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
641 | oldset = ¤t->saved_sigmask; | |
642 | else | |
1da177e4 LT |
643 | oldset = ¤t->blocked; |
644 | ||
645 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
7b3e2fc8 RB |
646 | if (signr > 0) { |
647 | /* Whee! Actually deliver the signal. */ | |
648 | if (handle_signal(signr, &info, &ka, oldset, regs) == 0) { | |
649 | /* | |
650 | * A signal was successfully delivered; the saved | |
651 | * sigmask will have been stored in the signal frame, | |
652 | * and will be restored by sigreturn, so we can simply | |
653 | * clear the TIF_RESTORE_SIGMASK flag. | |
654 | */ | |
655 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
656 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
657 | } | |
45887e12 RB |
658 | |
659 | return; | |
7b3e2fc8 | 660 | } |
1da177e4 | 661 | |
1da177e4 LT |
662 | /* |
663 | * Who's code doesn't conform to the restartable syscall convention | |
664 | * dies here!!! The li instruction, a single machine instruction, | |
665 | * must directly be followed by the syscall instruction. | |
666 | */ | |
667 | if (regs->regs[0]) { | |
668 | if (regs->regs[2] == ERESTARTNOHAND || | |
669 | regs->regs[2] == ERESTARTSYS || | |
670 | regs->regs[2] == ERESTARTNOINTR) { | |
671 | regs->regs[7] = regs->regs[26]; | |
672 | regs->cp0_epc -= 8; | |
673 | } | |
674 | if (regs->regs[2] == ERESTART_RESTARTBLOCK) { | |
151fd6ac | 675 | regs->regs[2] = current->thread.abi->restart; |
1da177e4 LT |
676 | regs->regs[7] = regs->regs[26]; |
677 | regs->cp0_epc -= 4; | |
678 | } | |
13fdd31a | 679 | regs->regs[0] = 0; /* Don't deal with this again. */ |
1da177e4 | 680 | } |
7b3e2fc8 RB |
681 | |
682 | /* | |
683 | * If there's no signal to deliver, we just put the saved sigmask | |
684 | * back | |
685 | */ | |
686 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
687 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
688 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
689 | } | |
1da177e4 LT |
690 | } |
691 | ||
692 | /* | |
693 | * notification of userspace execution resumption | |
7b3e2fc8 | 694 | * - triggered by the TIF_WORK_MASK flags |
1da177e4 | 695 | */ |
7b3e2fc8 | 696 | asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, |
1da177e4 LT |
697 | __u32 thread_info_flags) |
698 | { | |
699 | /* deal with pending signal delivery */ | |
7b3e2fc8 | 700 | if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)) |
151fd6ac | 701 | do_signal(regs); |
1da177e4 | 702 | } |