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> | |
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> | |
dbda6ac0 | 22 | #include <linux/syscalls.h> |
faea6234 | 23 | #include <linux/uaccess.h> |
1da177e4 | 24 | |
e50c0a8f | 25 | #include <asm/abi.h> |
1da177e4 LT |
26 | #include <asm/asm.h> |
27 | #include <linux/bitops.h> | |
28 | #include <asm/cacheflush.h> | |
29 | #include <asm/fpu.h> | |
30 | #include <asm/sim.h> | |
1da177e4 LT |
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 | */ | |
faea6234 AN |
81 | static int protected_save_fp_context(struct sigcontext __user *sc) |
82 | { | |
83 | int err; | |
84 | while (1) { | |
85 | lock_fpu_owner(); | |
86 | own_fpu_inatomic(1); | |
87 | err = save_fp_context(sc); /* this might fail */ | |
88 | unlock_fpu_owner(); | |
89 | if (likely(!err)) | |
90 | break; | |
91 | /* touch the sigcontext and try again */ | |
92 | err = __put_user(0, &sc->sc_fpregs[0]) | | |
93 | __put_user(0, &sc->sc_fpregs[31]) | | |
94 | __put_user(0, &sc->sc_fpc_csr); | |
95 | if (err) | |
96 | break; /* really bad sigcontext */ | |
97 | } | |
98 | return err; | |
99 | } | |
100 | ||
101 | static int protected_restore_fp_context(struct sigcontext __user *sc) | |
102 | { | |
103 | int err, tmp; | |
104 | while (1) { | |
105 | lock_fpu_owner(); | |
106 | own_fpu_inatomic(0); | |
107 | err = restore_fp_context(sc); /* this might fail */ | |
108 | unlock_fpu_owner(); | |
109 | if (likely(!err)) | |
110 | break; | |
111 | /* touch the sigcontext and try again */ | |
112 | err = __get_user(tmp, &sc->sc_fpregs[0]) | | |
113 | __get_user(tmp, &sc->sc_fpregs[31]) | | |
114 | __get_user(tmp, &sc->sc_fpc_csr); | |
115 | if (err) | |
116 | break; /* really bad sigcontext */ | |
117 | } | |
118 | return err; | |
119 | } | |
120 | ||
c3fc4ab3 FBH |
121 | int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
122 | { | |
123 | int err = 0; | |
124 | int i; | |
53dc8028 | 125 | unsigned int used_math; |
c3fc4ab3 FBH |
126 | |
127 | err |= __put_user(regs->cp0_epc, &sc->sc_pc); | |
128 | ||
129 | err |= __put_user(0, &sc->sc_regs[0]); | |
130 | for (i = 1; i < 32; i++) | |
131 | err |= __put_user(regs->regs[i], &sc->sc_regs[i]); | |
132 | ||
9693a853 FBH |
133 | #ifdef CONFIG_CPU_HAS_SMARTMIPS |
134 | err |= __put_user(regs->acx, &sc->sc_acx); | |
135 | #endif | |
c3fc4ab3 FBH |
136 | err |= __put_user(regs->hi, &sc->sc_mdhi); |
137 | err |= __put_user(regs->lo, &sc->sc_mdlo); | |
138 | if (cpu_has_dsp) { | |
139 | err |= __put_user(mfhi1(), &sc->sc_hi1); | |
140 | err |= __put_user(mflo1(), &sc->sc_lo1); | |
141 | err |= __put_user(mfhi2(), &sc->sc_hi2); | |
142 | err |= __put_user(mflo2(), &sc->sc_lo2); | |
143 | err |= __put_user(mfhi3(), &sc->sc_hi3); | |
144 | err |= __put_user(mflo3(), &sc->sc_lo3); | |
145 | err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); | |
146 | } | |
147 | ||
53dc8028 AN |
148 | used_math = !!used_math(); |
149 | err |= __put_user(used_math, &sc->sc_used_math); | |
c3fc4ab3 | 150 | |
53dc8028 | 151 | if (used_math) { |
c3fc4ab3 FBH |
152 | /* |
153 | * Save FPU state to signal context. Signal handler | |
154 | * will "inherit" current FPU state. | |
155 | */ | |
faea6234 | 156 | err |= protected_save_fp_context(sc); |
c3fc4ab3 FBH |
157 | } |
158 | return err; | |
159 | } | |
160 | ||
c6a2f467 AN |
161 | int fpcsr_pending(unsigned int __user *fpcsr) |
162 | { | |
163 | int err, sig = 0; | |
164 | unsigned int csr, enabled; | |
165 | ||
166 | err = __get_user(csr, fpcsr); | |
167 | enabled = FPU_CSR_UNI_X | ((csr & FPU_CSR_ALL_E) << 5); | |
168 | /* | |
169 | * If the signal handler set some FPU exceptions, clear it and | |
170 | * send SIGFPE. | |
171 | */ | |
172 | if (csr & enabled) { | |
173 | csr &= ~enabled; | |
174 | err |= __put_user(csr, fpcsr); | |
175 | sig = SIGFPE; | |
176 | } | |
177 | return err ?: sig; | |
178 | } | |
179 | ||
180 | static int | |
181 | check_and_restore_fp_context(struct sigcontext __user *sc) | |
182 | { | |
183 | int err, sig; | |
184 | ||
185 | err = sig = fpcsr_pending(&sc->sc_fpc_csr); | |
186 | if (err > 0) | |
187 | err = 0; | |
faea6234 | 188 | err |= protected_restore_fp_context(sc); |
c6a2f467 AN |
189 | return err ?: sig; |
190 | } | |
191 | ||
c3fc4ab3 FBH |
192 | int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
193 | { | |
194 | unsigned int used_math; | |
195 | unsigned long treg; | |
196 | int err = 0; | |
197 | int i; | |
198 | ||
199 | /* Always make any pending restarted system calls return -EINTR */ | |
200 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
201 | ||
202 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); | |
9693a853 FBH |
203 | |
204 | #ifdef CONFIG_CPU_HAS_SMARTMIPS | |
205 | err |= __get_user(regs->acx, &sc->sc_acx); | |
206 | #endif | |
c3fc4ab3 FBH |
207 | err |= __get_user(regs->hi, &sc->sc_mdhi); |
208 | err |= __get_user(regs->lo, &sc->sc_mdlo); | |
209 | if (cpu_has_dsp) { | |
210 | err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); | |
211 | err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); | |
212 | err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); | |
213 | err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); | |
214 | err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); | |
215 | err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); | |
216 | err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); | |
217 | } | |
218 | ||
219 | for (i = 1; i < 32; i++) | |
220 | err |= __get_user(regs->regs[i], &sc->sc_regs[i]); | |
221 | ||
222 | err |= __get_user(used_math, &sc->sc_used_math); | |
223 | conditional_used_math(used_math); | |
224 | ||
53dc8028 | 225 | if (used_math) { |
c3fc4ab3 | 226 | /* restore fpu context if we have used it before */ |
c6a2f467 AN |
227 | if (!err) |
228 | err = check_and_restore_fp_context(sc); | |
c3fc4ab3 FBH |
229 | } else { |
230 | /* signal handler may have used FPU. Give it up. */ | |
53dc8028 | 231 | lose_fpu(0); |
c3fc4ab3 FBH |
232 | } |
233 | ||
c3fc4ab3 FBH |
234 | return err; |
235 | } | |
236 | ||
237 | void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, | |
238 | size_t frame_size) | |
239 | { | |
240 | unsigned long sp; | |
241 | ||
242 | /* Default to using normal stack */ | |
243 | sp = regs->regs[29]; | |
244 | ||
245 | /* | |
246 | * FPU emulator may have it's own trampoline active just | |
247 | * above the user stack, 16-bytes before the next lowest | |
248 | * 16 byte boundary. Try to avoid trashing it. | |
249 | */ | |
250 | sp -= 32; | |
251 | ||
252 | /* This is the X/Open sanctioned signal stack switching. */ | |
253 | if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0)) | |
254 | sp = current->sas_ss_sp + current->sas_ss_size; | |
255 | ||
256 | return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK)); | |
257 | } | |
258 | ||
259 | int install_sigtramp(unsigned int __user *tramp, unsigned int syscall) | |
260 | { | |
261 | int err; | |
262 | ||
263 | /* | |
264 | * Set up the return code ... | |
265 | * | |
266 | * li v0, __NR__foo_sigreturn | |
267 | * syscall | |
268 | */ | |
269 | ||
270 | err = __put_user(0x24020000 + syscall, tramp + 0); | |
601dde45 | 271 | err |= __put_user(0x0000000c , tramp + 1); |
c3fc4ab3 FBH |
272 | if (ICACHE_REFILLS_WORKAROUND_WAR) { |
273 | err |= __put_user(0, tramp + 2); | |
274 | err |= __put_user(0, tramp + 3); | |
275 | err |= __put_user(0, tramp + 4); | |
276 | err |= __put_user(0, tramp + 5); | |
277 | err |= __put_user(0, tramp + 6); | |
278 | err |= __put_user(0, tramp + 7); | |
279 | } | |
280 | flush_cache_sigtramp((unsigned long) tramp); | |
281 | ||
282 | return err; | |
283 | } | |
284 | ||
1da177e4 LT |
285 | /* |
286 | * Atomically swap in the new signal mask, and wait for a signal. | |
287 | */ | |
288 | ||
289 | #ifdef CONFIG_TRAD_SIGNALS | |
f90080a0 | 290 | asmlinkage int sys_sigsuspend(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 291 | { |
7b3e2fc8 | 292 | sigset_t newset; |
fe00f943 | 293 | sigset_t __user *uset; |
1da177e4 | 294 | |
fe00f943 | 295 | uset = (sigset_t __user *) regs.regs[4]; |
1da177e4 LT |
296 | if (copy_from_user(&newset, uset, sizeof(sigset_t))) |
297 | return -EFAULT; | |
298 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
299 | ||
300 | spin_lock_irq(¤t->sighand->siglock); | |
7b3e2fc8 | 301 | current->saved_sigmask = current->blocked; |
1da177e4 LT |
302 | current->blocked = newset; |
303 | recalc_sigpending(); | |
304 | spin_unlock_irq(¤t->sighand->siglock); | |
305 | ||
7b3e2fc8 RB |
306 | current->state = TASK_INTERRUPTIBLE; |
307 | schedule(); | |
308 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
309 | return -ERESTARTNOHAND; | |
1da177e4 LT |
310 | } |
311 | #endif | |
312 | ||
f90080a0 | 313 | asmlinkage int sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 314 | { |
7b3e2fc8 | 315 | sigset_t newset; |
fe00f943 | 316 | sigset_t __user *unewset; |
1da177e4 LT |
317 | size_t sigsetsize; |
318 | ||
319 | /* XXX Don't preclude handling different sized sigset_t's. */ | |
320 | sigsetsize = regs.regs[5]; | |
321 | if (sigsetsize != sizeof(sigset_t)) | |
322 | return -EINVAL; | |
323 | ||
fe00f943 | 324 | unewset = (sigset_t __user *) regs.regs[4]; |
1da177e4 LT |
325 | if (copy_from_user(&newset, unewset, sizeof(newset))) |
326 | return -EFAULT; | |
327 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
328 | ||
329 | spin_lock_irq(¤t->sighand->siglock); | |
7b3e2fc8 | 330 | current->saved_sigmask = current->blocked; |
1da177e4 | 331 | current->blocked = newset; |
e0daad44 | 332 | recalc_sigpending(); |
1da177e4 LT |
333 | spin_unlock_irq(¤t->sighand->siglock); |
334 | ||
7b3e2fc8 RB |
335 | current->state = TASK_INTERRUPTIBLE; |
336 | schedule(); | |
337 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
338 | return -ERESTARTNOHAND; | |
1da177e4 LT |
339 | } |
340 | ||
341 | #ifdef CONFIG_TRAD_SIGNALS | |
dbda6ac0 RB |
342 | SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act, |
343 | struct sigaction __user *, oact) | |
1da177e4 LT |
344 | { |
345 | struct k_sigaction new_ka, old_ka; | |
346 | int ret; | |
347 | int err = 0; | |
348 | ||
349 | if (act) { | |
350 | old_sigset_t mask; | |
351 | ||
352 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
353 | return -EFAULT; | |
354 | err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler); | |
355 | err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
356 | err |= __get_user(mask, &act->sa_mask.sig[0]); | |
357 | if (err) | |
358 | return -EFAULT; | |
359 | ||
360 | siginitset(&new_ka.sa.sa_mask, mask); | |
361 | } | |
362 | ||
363 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
364 | ||
365 | if (!ret && oact) { | |
366 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
e0daad44 | 367 | return -EFAULT; |
1da177e4 LT |
368 | err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
369 | err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler); | |
370 | err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); | |
371 | err |= __put_user(0, &oact->sa_mask.sig[1]); | |
372 | err |= __put_user(0, &oact->sa_mask.sig[2]); | |
373 | err |= __put_user(0, &oact->sa_mask.sig[3]); | |
374 | if (err) | |
375 | return -EFAULT; | |
376 | } | |
377 | ||
378 | return ret; | |
379 | } | |
380 | #endif | |
381 | ||
382 | asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs) | |
383 | { | |
fe00f943 RB |
384 | const stack_t __user *uss = (const stack_t __user *) regs.regs[4]; |
385 | stack_t __user *uoss = (stack_t __user *) regs.regs[5]; | |
1da177e4 LT |
386 | unsigned long usp = regs.regs[29]; |
387 | ||
388 | return do_sigaltstack(uss, uoss, usp); | |
389 | } | |
390 | ||
1da177e4 | 391 | #ifdef CONFIG_TRAD_SIGNALS |
f90080a0 | 392 | asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 393 | { |
9bbf28a3 | 394 | struct sigframe __user *frame; |
1da177e4 | 395 | sigset_t blocked; |
c6a2f467 | 396 | int sig; |
1da177e4 | 397 | |
9bbf28a3 | 398 | frame = (struct sigframe __user *) regs.regs[29]; |
1da177e4 LT |
399 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
400 | goto badframe; | |
401 | if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked))) | |
402 | goto badframe; | |
403 | ||
404 | sigdelsetmask(&blocked, ~_BLOCKABLE); | |
405 | spin_lock_irq(¤t->sighand->siglock); | |
406 | current->blocked = blocked; | |
407 | recalc_sigpending(); | |
408 | spin_unlock_irq(¤t->sighand->siglock); | |
409 | ||
c6a2f467 AN |
410 | sig = restore_sigcontext(®s, &frame->sf_sc); |
411 | if (sig < 0) | |
1da177e4 | 412 | goto badframe; |
c6a2f467 AN |
413 | else if (sig) |
414 | force_sig(sig, current); | |
1da177e4 LT |
415 | |
416 | /* | |
417 | * Don't let your children do this ... | |
418 | */ | |
1da177e4 LT |
419 | __asm__ __volatile__( |
420 | "move\t$29, %0\n\t" | |
421 | "j\tsyscall_exit" | |
422 | :/* no outputs */ | |
423 | :"r" (®s)); | |
424 | /* Unreached */ | |
425 | ||
426 | badframe: | |
427 | force_sig(SIGSEGV, current); | |
428 | } | |
e50c0a8f | 429 | #endif /* CONFIG_TRAD_SIGNALS */ |
1da177e4 | 430 | |
f90080a0 | 431 | asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 432 | { |
9bbf28a3 | 433 | struct rt_sigframe __user *frame; |
1da177e4 LT |
434 | sigset_t set; |
435 | stack_t st; | |
c6a2f467 | 436 | int sig; |
1da177e4 | 437 | |
9bbf28a3 | 438 | frame = (struct rt_sigframe __user *) regs.regs[29]; |
1da177e4 LT |
439 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
440 | goto badframe; | |
441 | if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) | |
442 | goto badframe; | |
443 | ||
444 | sigdelsetmask(&set, ~_BLOCKABLE); | |
445 | spin_lock_irq(¤t->sighand->siglock); | |
446 | current->blocked = set; | |
447 | recalc_sigpending(); | |
448 | spin_unlock_irq(¤t->sighand->siglock); | |
449 | ||
c6a2f467 AN |
450 | sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext); |
451 | if (sig < 0) | |
1da177e4 | 452 | goto badframe; |
c6a2f467 AN |
453 | else if (sig) |
454 | force_sig(sig, current); | |
1da177e4 LT |
455 | |
456 | if (__copy_from_user(&st, &frame->rs_uc.uc_stack, sizeof(st))) | |
457 | goto badframe; | |
458 | /* It is more difficult to avoid calling this function than to | |
459 | call it and ignore errors. */ | |
9bbf28a3 | 460 | do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]); |
1da177e4 LT |
461 | |
462 | /* | |
463 | * Don't let your children do this ... | |
464 | */ | |
465 | __asm__ __volatile__( | |
466 | "move\t$29, %0\n\t" | |
467 | "j\tsyscall_exit" | |
468 | :/* no outputs */ | |
469 | :"r" (®s)); | |
470 | /* Unreached */ | |
471 | ||
472 | badframe: | |
473 | force_sig(SIGSEGV, current); | |
474 | } | |
475 | ||
476 | #ifdef CONFIG_TRAD_SIGNALS | |
151fd6ac | 477 | static int setup_frame(struct k_sigaction * ka, struct pt_regs *regs, |
1da177e4 LT |
478 | int signr, sigset_t *set) |
479 | { | |
9bbf28a3 | 480 | struct sigframe __user *frame; |
1da177e4 LT |
481 | int err = 0; |
482 | ||
483 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
484 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
485 | goto give_sigsegv; | |
486 | ||
601dde45 | 487 | err |= install_sigtramp(frame->sf_code, __NR_sigreturn); |
1da177e4 LT |
488 | |
489 | err |= setup_sigcontext(regs, &frame->sf_sc); | |
490 | err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set)); | |
491 | if (err) | |
492 | goto give_sigsegv; | |
493 | ||
494 | /* | |
495 | * Arguments to signal handler: | |
496 | * | |
497 | * a0 = signal number | |
498 | * a1 = 0 (should be cause) | |
499 | * a2 = pointer to struct sigcontext | |
500 | * | |
501 | * $25 and c0_epc point to the signal handler, $29 points to the | |
502 | * struct sigframe. | |
503 | */ | |
504 | regs->regs[ 4] = signr; | |
505 | regs->regs[ 5] = 0; | |
506 | regs->regs[ 6] = (unsigned long) &frame->sf_sc; | |
507 | regs->regs[29] = (unsigned long) frame; | |
508 | regs->regs[31] = (unsigned long) frame->sf_code; | |
509 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; | |
510 | ||
722bb63d | 511 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 | 512 | current->comm, current->pid, |
722bb63d | 513 | frame, regs->cp0_epc, regs->regs[31]); |
e0daad44 | 514 | return 0; |
1da177e4 LT |
515 | |
516 | give_sigsegv: | |
517 | force_sigsegv(signr, current); | |
7b3e2fc8 | 518 | return -EFAULT; |
1da177e4 LT |
519 | } |
520 | #endif | |
521 | ||
151fd6ac | 522 | static int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs, |
1da177e4 LT |
523 | int signr, sigset_t *set, siginfo_t *info) |
524 | { | |
9bbf28a3 | 525 | struct rt_sigframe __user *frame; |
1da177e4 LT |
526 | int err = 0; |
527 | ||
528 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
529 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
530 | goto give_sigsegv; | |
531 | ||
601dde45 | 532 | err |= install_sigtramp(frame->rs_code, __NR_rt_sigreturn); |
1da177e4 LT |
533 | |
534 | /* Create siginfo. */ | |
535 | err |= copy_siginfo_to_user(&frame->rs_info, info); | |
536 | ||
537 | /* Create the ucontext. */ | |
538 | err |= __put_user(0, &frame->rs_uc.uc_flags); | |
5665a0ac | 539 | err |= __put_user(NULL, &frame->rs_uc.uc_link); |
9c6031cc | 540 | err |= __put_user((void __user *)current->sas_ss_sp, |
1da177e4 LT |
541 | &frame->rs_uc.uc_stack.ss_sp); |
542 | err |= __put_user(sas_ss_flags(regs->regs[29]), | |
543 | &frame->rs_uc.uc_stack.ss_flags); | |
544 | err |= __put_user(current->sas_ss_size, | |
545 | &frame->rs_uc.uc_stack.ss_size); | |
546 | err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); | |
547 | err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); | |
548 | ||
549 | if (err) | |
550 | goto give_sigsegv; | |
551 | ||
552 | /* | |
553 | * Arguments to signal handler: | |
554 | * | |
555 | * a0 = signal number | |
556 | * a1 = 0 (should be cause) | |
557 | * a2 = pointer to ucontext | |
558 | * | |
559 | * $25 and c0_epc point to the signal handler, $29 points to | |
560 | * the struct rt_sigframe. | |
561 | */ | |
562 | regs->regs[ 4] = signr; | |
563 | regs->regs[ 5] = (unsigned long) &frame->rs_info; | |
564 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
565 | regs->regs[29] = (unsigned long) frame; | |
566 | regs->regs[31] = (unsigned long) frame->rs_code; | |
567 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; | |
568 | ||
722bb63d | 569 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 LT |
570 | current->comm, current->pid, |
571 | frame, regs->cp0_epc, regs->regs[31]); | |
722bb63d | 572 | |
7b3e2fc8 | 573 | return 0; |
1da177e4 LT |
574 | |
575 | give_sigsegv: | |
576 | force_sigsegv(signr, current); | |
7b3e2fc8 | 577 | return -EFAULT; |
1da177e4 LT |
578 | } |
579 | ||
151fd6ac RB |
580 | struct mips_abi mips_abi = { |
581 | #ifdef CONFIG_TRAD_SIGNALS | |
582 | .setup_frame = setup_frame, | |
583 | #endif | |
584 | .setup_rt_frame = setup_rt_frame, | |
585 | .restart = __NR_restart_syscall | |
586 | }; | |
587 | ||
e692eb30 | 588 | static int handle_signal(unsigned long sig, siginfo_t *info, |
1da177e4 LT |
589 | struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs) |
590 | { | |
129bc8f7 RB |
591 | int ret; |
592 | ||
1da177e4 LT |
593 | switch(regs->regs[0]) { |
594 | case ERESTART_RESTARTBLOCK: | |
595 | case ERESTARTNOHAND: | |
596 | regs->regs[2] = EINTR; | |
597 | break; | |
598 | case ERESTARTSYS: | |
7b3e2fc8 | 599 | if (!(ka->sa.sa_flags & SA_RESTART)) { |
1da177e4 LT |
600 | regs->regs[2] = EINTR; |
601 | break; | |
602 | } | |
603 | /* fallthrough */ | |
604 | case ERESTARTNOINTR: /* Userland will reload $v0. */ | |
605 | regs->regs[7] = regs->regs[26]; | |
606 | regs->cp0_epc -= 8; | |
607 | } | |
608 | ||
609 | regs->regs[0] = 0; /* Don't deal with this again. */ | |
610 | ||
e50c0a8f | 611 | if (sig_uses_siginfo(ka)) |
129bc8f7 | 612 | ret = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info); |
1da177e4 | 613 | else |
129bc8f7 | 614 | ret = current->thread.abi->setup_frame(ka, regs, sig, oldset); |
1da177e4 | 615 | |
69be8f18 | 616 | spin_lock_irq(¤t->sighand->siglock); |
21a151d8 | 617 | sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask); |
69be8f18 | 618 | if (!(ka->sa.sa_flags & SA_NODEFER)) |
21a151d8 | 619 | sigaddset(¤t->blocked, sig); |
69be8f18 SR |
620 | recalc_sigpending(); |
621 | spin_unlock_irq(¤t->sighand->siglock); | |
129bc8f7 RB |
622 | |
623 | return ret; | |
1da177e4 LT |
624 | } |
625 | ||
151fd6ac | 626 | static void do_signal(struct pt_regs *regs) |
1da177e4 LT |
627 | { |
628 | struct k_sigaction ka; | |
7b3e2fc8 | 629 | sigset_t *oldset; |
1da177e4 LT |
630 | siginfo_t info; |
631 | int signr; | |
632 | ||
1da177e4 LT |
633 | /* |
634 | * We want the common case to go fast, which is why we may in certain | |
635 | * cases get here from kernel mode. Just return without doing anything | |
636 | * if so. | |
637 | */ | |
638 | if (!user_mode(regs)) | |
40ac5d47 | 639 | return; |
1da177e4 | 640 | |
7b3e2fc8 RB |
641 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
642 | oldset = ¤t->saved_sigmask; | |
643 | else | |
1da177e4 LT |
644 | oldset = ¤t->blocked; |
645 | ||
646 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
7b3e2fc8 RB |
647 | if (signr > 0) { |
648 | /* Whee! Actually deliver the signal. */ | |
649 | if (handle_signal(signr, &info, &ka, oldset, regs) == 0) { | |
650 | /* | |
651 | * A signal was successfully delivered; the saved | |
652 | * sigmask will have been stored in the signal frame, | |
653 | * and will be restored by sigreturn, so we can simply | |
654 | * clear the TIF_RESTORE_SIGMASK flag. | |
655 | */ | |
656 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
657 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
658 | } | |
45887e12 RB |
659 | |
660 | return; | |
7b3e2fc8 | 661 | } |
1da177e4 | 662 | |
1da177e4 LT |
663 | /* |
664 | * Who's code doesn't conform to the restartable syscall convention | |
665 | * dies here!!! The li instruction, a single machine instruction, | |
666 | * must directly be followed by the syscall instruction. | |
667 | */ | |
668 | if (regs->regs[0]) { | |
669 | if (regs->regs[2] == ERESTARTNOHAND || | |
670 | regs->regs[2] == ERESTARTSYS || | |
671 | regs->regs[2] == ERESTARTNOINTR) { | |
672 | regs->regs[7] = regs->regs[26]; | |
673 | regs->cp0_epc -= 8; | |
674 | } | |
675 | if (regs->regs[2] == ERESTART_RESTARTBLOCK) { | |
151fd6ac | 676 | regs->regs[2] = current->thread.abi->restart; |
1da177e4 LT |
677 | regs->regs[7] = regs->regs[26]; |
678 | regs->cp0_epc -= 4; | |
679 | } | |
13fdd31a | 680 | regs->regs[0] = 0; /* Don't deal with this again. */ |
1da177e4 | 681 | } |
7b3e2fc8 RB |
682 | |
683 | /* | |
684 | * If there's no signal to deliver, we just put the saved sigmask | |
685 | * back | |
686 | */ | |
687 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
688 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
689 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
690 | } | |
1da177e4 LT |
691 | } |
692 | ||
693 | /* | |
694 | * notification of userspace execution resumption | |
7b3e2fc8 | 695 | * - triggered by the TIF_WORK_MASK flags |
1da177e4 | 696 | */ |
7b3e2fc8 | 697 | asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, |
1da177e4 LT |
698 | __u32 thread_info_flags) |
699 | { | |
700 | /* deal with pending signal delivery */ | |
7b3e2fc8 | 701 | if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)) |
151fd6ac | 702 | do_signal(regs); |
1da177e4 | 703 | } |