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 | |
f90080a0 | 250 | asmlinkage int sys_sigsuspend(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 251 | { |
7b3e2fc8 | 252 | sigset_t newset; |
fe00f943 | 253 | sigset_t __user *uset; |
1da177e4 | 254 | |
fe00f943 | 255 | uset = (sigset_t __user *) regs.regs[4]; |
1da177e4 LT |
256 | if (copy_from_user(&newset, uset, sizeof(sigset_t))) |
257 | return -EFAULT; | |
68f3f16d | 258 | return sigsuspend(&newset); |
1da177e4 LT |
259 | } |
260 | #endif | |
261 | ||
f90080a0 | 262 | asmlinkage int sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 263 | { |
7b3e2fc8 | 264 | sigset_t newset; |
fe00f943 | 265 | sigset_t __user *unewset; |
1da177e4 LT |
266 | size_t sigsetsize; |
267 | ||
268 | /* XXX Don't preclude handling different sized sigset_t's. */ | |
269 | sigsetsize = regs.regs[5]; | |
270 | if (sigsetsize != sizeof(sigset_t)) | |
271 | return -EINVAL; | |
272 | ||
fe00f943 | 273 | unewset = (sigset_t __user *) regs.regs[4]; |
1da177e4 LT |
274 | if (copy_from_user(&newset, unewset, sizeof(newset))) |
275 | return -EFAULT; | |
68f3f16d | 276 | return sigsuspend(&newset); |
1da177e4 LT |
277 | } |
278 | ||
279 | #ifdef CONFIG_TRAD_SIGNALS | |
dbda6ac0 RB |
280 | SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act, |
281 | struct sigaction __user *, oact) | |
1da177e4 LT |
282 | { |
283 | struct k_sigaction new_ka, old_ka; | |
284 | int ret; | |
285 | int err = 0; | |
286 | ||
287 | if (act) { | |
288 | old_sigset_t mask; | |
289 | ||
290 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
291 | return -EFAULT; | |
292 | err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler); | |
293 | err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
294 | err |= __get_user(mask, &act->sa_mask.sig[0]); | |
295 | if (err) | |
296 | return -EFAULT; | |
297 | ||
298 | siginitset(&new_ka.sa.sa_mask, mask); | |
299 | } | |
300 | ||
301 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
302 | ||
303 | if (!ret && oact) { | |
304 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
e0daad44 | 305 | return -EFAULT; |
1da177e4 LT |
306 | err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
307 | err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler); | |
308 | err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); | |
309 | err |= __put_user(0, &oact->sa_mask.sig[1]); | |
310 | err |= __put_user(0, &oact->sa_mask.sig[2]); | |
311 | err |= __put_user(0, &oact->sa_mask.sig[3]); | |
312 | if (err) | |
313 | return -EFAULT; | |
314 | } | |
315 | ||
316 | return ret; | |
317 | } | |
318 | #endif | |
319 | ||
320 | asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs) | |
321 | { | |
fe00f943 RB |
322 | const stack_t __user *uss = (const stack_t __user *) regs.regs[4]; |
323 | stack_t __user *uoss = (stack_t __user *) regs.regs[5]; | |
1da177e4 LT |
324 | unsigned long usp = regs.regs[29]; |
325 | ||
326 | return do_sigaltstack(uss, uoss, usp); | |
327 | } | |
328 | ||
1da177e4 | 329 | #ifdef CONFIG_TRAD_SIGNALS |
f90080a0 | 330 | asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 331 | { |
9bbf28a3 | 332 | struct sigframe __user *frame; |
1da177e4 | 333 | sigset_t blocked; |
c6a2f467 | 334 | int sig; |
1da177e4 | 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); | |
8598f3cd | 343 | set_current_blocked(&blocked); |
1da177e4 | 344 | |
c6a2f467 AN |
345 | sig = restore_sigcontext(®s, &frame->sf_sc); |
346 | if (sig < 0) | |
1da177e4 | 347 | goto badframe; |
c6a2f467 AN |
348 | else if (sig) |
349 | force_sig(sig, current); | |
1da177e4 LT |
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 | 369 | sigset_t set; |
c6a2f467 | 370 | int sig; |
1da177e4 | 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); | |
8598f3cd | 379 | set_current_blocked(&set); |
1da177e4 | 380 | |
c6a2f467 AN |
381 | sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext); |
382 | if (sig < 0) | |
1da177e4 | 383 | goto badframe; |
c6a2f467 AN |
384 | else if (sig) |
385 | force_sig(sig, current); | |
1da177e4 | 386 | |
1da177e4 LT |
387 | /* It is more difficult to avoid calling this function than to |
388 | call it and ignore errors. */ | |
4bfb8c5c | 389 | do_sigaltstack(&frame->rs_uc.uc_stack, NULL, regs.regs[29]); |
1da177e4 LT |
390 | |
391 | /* | |
392 | * Don't let your children do this ... | |
393 | */ | |
394 | __asm__ __volatile__( | |
395 | "move\t$29, %0\n\t" | |
396 | "j\tsyscall_exit" | |
397 | :/* no outputs */ | |
398 | :"r" (®s)); | |
399 | /* Unreached */ | |
400 | ||
401 | badframe: | |
402 | force_sig(SIGSEGV, current); | |
403 | } | |
404 | ||
405 | #ifdef CONFIG_TRAD_SIGNALS | |
d814c28c DD |
406 | static int setup_frame(void *sig_return, struct k_sigaction *ka, |
407 | struct pt_regs *regs, int signr, sigset_t *set) | |
1da177e4 | 408 | { |
9bbf28a3 | 409 | struct sigframe __user *frame; |
1da177e4 LT |
410 | int err = 0; |
411 | ||
412 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
413 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
414 | goto give_sigsegv; | |
415 | ||
1da177e4 LT |
416 | err |= setup_sigcontext(regs, &frame->sf_sc); |
417 | err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set)); | |
418 | if (err) | |
419 | goto give_sigsegv; | |
420 | ||
421 | /* | |
422 | * Arguments to signal handler: | |
423 | * | |
424 | * a0 = signal number | |
425 | * a1 = 0 (should be cause) | |
426 | * a2 = pointer to struct sigcontext | |
427 | * | |
428 | * $25 and c0_epc point to the signal handler, $29 points to the | |
429 | * struct sigframe. | |
430 | */ | |
431 | regs->regs[ 4] = signr; | |
432 | regs->regs[ 5] = 0; | |
433 | regs->regs[ 6] = (unsigned long) &frame->sf_sc; | |
434 | regs->regs[29] = (unsigned long) frame; | |
d814c28c | 435 | regs->regs[31] = (unsigned long) sig_return; |
1da177e4 LT |
436 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; |
437 | ||
722bb63d | 438 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 | 439 | current->comm, current->pid, |
722bb63d | 440 | frame, regs->cp0_epc, regs->regs[31]); |
e0daad44 | 441 | return 0; |
1da177e4 LT |
442 | |
443 | give_sigsegv: | |
444 | force_sigsegv(signr, current); | |
7b3e2fc8 | 445 | return -EFAULT; |
1da177e4 LT |
446 | } |
447 | #endif | |
448 | ||
d814c28c DD |
449 | static int setup_rt_frame(void *sig_return, struct k_sigaction *ka, |
450 | struct pt_regs *regs, int signr, sigset_t *set, | |
451 | siginfo_t *info) | |
1da177e4 | 452 | { |
9bbf28a3 | 453 | struct rt_sigframe __user *frame; |
1da177e4 LT |
454 | int err = 0; |
455 | ||
456 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
457 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
458 | goto give_sigsegv; | |
459 | ||
1da177e4 LT |
460 | /* Create siginfo. */ |
461 | err |= copy_siginfo_to_user(&frame->rs_info, info); | |
462 | ||
463 | /* Create the ucontext. */ | |
464 | err |= __put_user(0, &frame->rs_uc.uc_flags); | |
5665a0ac | 465 | err |= __put_user(NULL, &frame->rs_uc.uc_link); |
9c6031cc | 466 | err |= __put_user((void __user *)current->sas_ss_sp, |
1da177e4 LT |
467 | &frame->rs_uc.uc_stack.ss_sp); |
468 | err |= __put_user(sas_ss_flags(regs->regs[29]), | |
469 | &frame->rs_uc.uc_stack.ss_flags); | |
470 | err |= __put_user(current->sas_ss_size, | |
471 | &frame->rs_uc.uc_stack.ss_size); | |
472 | err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); | |
473 | err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); | |
474 | ||
475 | if (err) | |
476 | goto give_sigsegv; | |
477 | ||
478 | /* | |
479 | * Arguments to signal handler: | |
480 | * | |
481 | * a0 = signal number | |
482 | * a1 = 0 (should be cause) | |
483 | * a2 = pointer to ucontext | |
484 | * | |
485 | * $25 and c0_epc point to the signal handler, $29 points to | |
486 | * the struct rt_sigframe. | |
487 | */ | |
488 | regs->regs[ 4] = signr; | |
489 | regs->regs[ 5] = (unsigned long) &frame->rs_info; | |
490 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
491 | regs->regs[29] = (unsigned long) frame; | |
d814c28c | 492 | regs->regs[31] = (unsigned long) sig_return; |
1da177e4 LT |
493 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; |
494 | ||
722bb63d | 495 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 LT |
496 | current->comm, current->pid, |
497 | frame, regs->cp0_epc, regs->regs[31]); | |
722bb63d | 498 | |
7b3e2fc8 | 499 | return 0; |
1da177e4 LT |
500 | |
501 | give_sigsegv: | |
502 | force_sigsegv(signr, current); | |
7b3e2fc8 | 503 | return -EFAULT; |
1da177e4 LT |
504 | } |
505 | ||
151fd6ac RB |
506 | struct mips_abi mips_abi = { |
507 | #ifdef CONFIG_TRAD_SIGNALS | |
508 | .setup_frame = setup_frame, | |
d814c28c | 509 | .signal_return_offset = offsetof(struct mips_vdso, signal_trampoline), |
151fd6ac RB |
510 | #endif |
511 | .setup_rt_frame = setup_rt_frame, | |
d814c28c DD |
512 | .rt_signal_return_offset = |
513 | offsetof(struct mips_vdso, rt_signal_trampoline), | |
151fd6ac RB |
514 | .restart = __NR_restart_syscall |
515 | }; | |
516 | ||
e692eb30 | 517 | static int handle_signal(unsigned long sig, siginfo_t *info, |
1da177e4 LT |
518 | struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs) |
519 | { | |
129bc8f7 | 520 | int ret; |
d814c28c DD |
521 | struct mips_abi *abi = current->thread.abi; |
522 | void *vdso = current->mm->context.vdso; | |
129bc8f7 | 523 | |
8f5a00eb AV |
524 | if (regs->regs[0]) { |
525 | switch(regs->regs[2]) { | |
526 | case ERESTART_RESTARTBLOCK: | |
527 | case ERESTARTNOHAND: | |
1da177e4 LT |
528 | regs->regs[2] = EINTR; |
529 | break; | |
8f5a00eb AV |
530 | case ERESTARTSYS: |
531 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
532 | regs->regs[2] = EINTR; | |
533 | break; | |
534 | } | |
535 | /* fallthrough */ | |
536 | case ERESTARTNOINTR: | |
537 | regs->regs[7] = regs->regs[26]; | |
538 | regs->regs[2] = regs->regs[0]; | |
539 | regs->cp0_epc -= 4; | |
1da177e4 | 540 | } |
1da177e4 | 541 | |
8f5a00eb AV |
542 | regs->regs[0] = 0; /* Don't deal with this again. */ |
543 | } | |
1da177e4 | 544 | |
e50c0a8f | 545 | if (sig_uses_siginfo(ka)) |
d814c28c DD |
546 | ret = abi->setup_rt_frame(vdso + abi->rt_signal_return_offset, |
547 | ka, regs, sig, oldset, info); | |
1da177e4 | 548 | else |
d814c28c DD |
549 | ret = abi->setup_frame(vdso + abi->signal_return_offset, |
550 | ka, regs, sig, oldset); | |
1da177e4 | 551 | |
062ab57b AV |
552 | if (ret) |
553 | return ret; | |
554 | ||
8598f3cd | 555 | block_sigmask(ka, sig); |
129bc8f7 RB |
556 | |
557 | return ret; | |
1da177e4 LT |
558 | } |
559 | ||
151fd6ac | 560 | static void do_signal(struct pt_regs *regs) |
1da177e4 LT |
561 | { |
562 | struct k_sigaction ka; | |
7b3e2fc8 | 563 | sigset_t *oldset; |
1da177e4 LT |
564 | siginfo_t info; |
565 | int signr; | |
566 | ||
1da177e4 LT |
567 | /* |
568 | * We want the common case to go fast, which is why we may in certain | |
569 | * cases get here from kernel mode. Just return without doing anything | |
570 | * if so. | |
571 | */ | |
572 | if (!user_mode(regs)) | |
40ac5d47 | 573 | return; |
1da177e4 | 574 | |
7b3e2fc8 RB |
575 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
576 | oldset = ¤t->saved_sigmask; | |
577 | else | |
1da177e4 LT |
578 | oldset = ¤t->blocked; |
579 | ||
580 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
7b3e2fc8 RB |
581 | if (signr > 0) { |
582 | /* Whee! Actually deliver the signal. */ | |
583 | if (handle_signal(signr, &info, &ka, oldset, regs) == 0) { | |
584 | /* | |
585 | * A signal was successfully delivered; the saved | |
586 | * sigmask will have been stored in the signal frame, | |
587 | * and will be restored by sigreturn, so we can simply | |
588 | * clear the TIF_RESTORE_SIGMASK flag. | |
589 | */ | |
590 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
591 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
592 | } | |
45887e12 RB |
593 | |
594 | return; | |
7b3e2fc8 | 595 | } |
1da177e4 | 596 | |
1da177e4 LT |
597 | if (regs->regs[0]) { |
598 | if (regs->regs[2] == ERESTARTNOHAND || | |
599 | regs->regs[2] == ERESTARTSYS || | |
600 | regs->regs[2] == ERESTARTNOINTR) { | |
8f5a00eb | 601 | regs->regs[2] = regs->regs[0]; |
1da177e4 | 602 | regs->regs[7] = regs->regs[26]; |
8f5a00eb | 603 | regs->cp0_epc -= 4; |
1da177e4 LT |
604 | } |
605 | if (regs->regs[2] == ERESTART_RESTARTBLOCK) { | |
151fd6ac | 606 | regs->regs[2] = current->thread.abi->restart; |
1da177e4 LT |
607 | regs->regs[7] = regs->regs[26]; |
608 | regs->cp0_epc -= 4; | |
609 | } | |
13fdd31a | 610 | regs->regs[0] = 0; /* Don't deal with this again. */ |
1da177e4 | 611 | } |
7b3e2fc8 RB |
612 | |
613 | /* | |
614 | * If there's no signal to deliver, we just put the saved sigmask | |
615 | * back | |
616 | */ | |
51a7b448 | 617 | restore_saved_sigmask(); |
1da177e4 LT |
618 | } |
619 | ||
620 | /* | |
621 | * notification of userspace execution resumption | |
7b3e2fc8 | 622 | * - triggered by the TIF_WORK_MASK flags |
1da177e4 | 623 | */ |
7b3e2fc8 | 624 | asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, |
1da177e4 LT |
625 | __u32 thread_info_flags) |
626 | { | |
1f717929 RB |
627 | local_irq_enable(); |
628 | ||
1da177e4 | 629 | /* deal with pending signal delivery */ |
7b3e2fc8 | 630 | if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)) |
151fd6ac | 631 | do_signal(regs); |
d0420c83 DH |
632 | |
633 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { | |
634 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
635 | tracehook_notify_resume(regs); | |
636 | } | |
1da177e4 | 637 | } |
137f6f3e RB |
638 | |
639 | #ifdef CONFIG_SMP | |
640 | static int smp_save_fp_context(struct sigcontext __user *sc) | |
641 | { | |
642 | return raw_cpu_has_fpu | |
643 | ? _save_fp_context(sc) | |
644 | : fpu_emulator_save_context(sc); | |
645 | } | |
646 | ||
647 | static int smp_restore_fp_context(struct sigcontext __user *sc) | |
648 | { | |
649 | return raw_cpu_has_fpu | |
650 | ? _restore_fp_context(sc) | |
651 | : fpu_emulator_restore_context(sc); | |
652 | } | |
653 | #endif | |
654 | ||
655 | static int signal_setup(void) | |
656 | { | |
657 | #ifdef CONFIG_SMP | |
658 | /* For now just do the cpu_has_fpu check when the functions are invoked */ | |
659 | save_fp_context = smp_save_fp_context; | |
660 | restore_fp_context = smp_restore_fp_context; | |
661 | #else | |
662 | if (cpu_has_fpu) { | |
663 | save_fp_context = _save_fp_context; | |
664 | restore_fp_context = _restore_fp_context; | |
665 | } else { | |
666 | save_fp_context = fpu_emulator_save_context; | |
667 | restore_fp_context = fpu_emulator_restore_context; | |
668 | } | |
669 | #endif | |
670 | ||
671 | return 0; | |
672 | } | |
673 | ||
674 | arch_initcall(signal_setup); |