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> |
c3fc5cd5 | 11 | #include <linux/context_tracking.h> |
1f717929 | 12 | #include <linux/irqflags.h> |
1da177e4 LT |
13 | #include <linux/sched.h> |
14 | #include <linux/mm.h> | |
15 | #include <linux/personality.h> | |
16 | #include <linux/smp.h> | |
1da177e4 LT |
17 | #include <linux/kernel.h> |
18 | #include <linux/signal.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/wait.h> | |
21 | #include <linux/ptrace.h> | |
22 | #include <linux/unistd.h> | |
23 | #include <linux/compiler.h> | |
dbda6ac0 | 24 | #include <linux/syscalls.h> |
faea6234 | 25 | #include <linux/uaccess.h> |
733e5e4b | 26 | #include <linux/tracehook.h> |
1da177e4 | 27 | |
e50c0a8f | 28 | #include <asm/abi.h> |
1da177e4 LT |
29 | #include <asm/asm.h> |
30 | #include <linux/bitops.h> | |
31 | #include <asm/cacheflush.h> | |
32 | #include <asm/fpu.h> | |
33 | #include <asm/sim.h> | |
1da177e4 LT |
34 | #include <asm/ucontext.h> |
35 | #include <asm/cpu-features.h> | |
02416dcf | 36 | #include <asm/war.h> |
d814c28c | 37 | #include <asm/vdso.h> |
b81947c6 | 38 | #include <asm/dsp.h> |
01be057b | 39 | #include <asm/inst.h> |
1da177e4 LT |
40 | |
41 | #include "signal-common.h" | |
42 | ||
137f6f3e RB |
43 | static int (*save_fp_context)(struct sigcontext __user *sc); |
44 | static int (*restore_fp_context)(struct sigcontext __user *sc); | |
45 | ||
46 | extern asmlinkage int _save_fp_context(struct sigcontext __user *sc); | |
47 | extern asmlinkage int _restore_fp_context(struct sigcontext __user *sc); | |
48 | ||
66680583 RB |
49 | struct sigframe { |
50 | u32 sf_ass[4]; /* argument save space for o32 */ | |
d814c28c | 51 | u32 sf_pad[2]; /* Was: signal trampoline */ |
66680583 RB |
52 | struct sigcontext sf_sc; |
53 | sigset_t sf_mask; | |
54 | }; | |
55 | ||
c0b9bae9 FBH |
56 | struct rt_sigframe { |
57 | u32 rs_ass[4]; /* argument save space for o32 */ | |
d814c28c | 58 | u32 rs_pad[2]; /* Was: signal trampoline */ |
c0b9bae9 FBH |
59 | struct siginfo rs_info; |
60 | struct ucontext rs_uc; | |
61 | }; | |
62 | ||
b2ead528 PB |
63 | /* |
64 | * Thread saved context copy to/from a signal context presumed to be on the | |
65 | * user stack, and therefore accessed with appropriate macros from uaccess.h. | |
66 | */ | |
67 | static int copy_fp_to_sigcontext(struct sigcontext __user *sc) | |
68 | { | |
69 | int i; | |
70 | int err = 0; | |
71 | ||
72 | for (i = 0; i < 32; i++) { | |
73 | err |= | |
74 | __put_user(get_fpr64(¤t->thread.fpu.fpr[i], 0), | |
75 | &sc->sc_fpregs[i]); | |
76 | } | |
77 | err |= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr); | |
78 | ||
79 | return err; | |
80 | } | |
81 | ||
82 | static int copy_fp_from_sigcontext(struct sigcontext __user *sc) | |
83 | { | |
84 | int i; | |
85 | int err = 0; | |
86 | u64 fpr_val; | |
87 | ||
88 | for (i = 0; i < 32; i++) { | |
89 | err |= __get_user(fpr_val, &sc->sc_fpregs[i]); | |
90 | set_fpr64(¤t->thread.fpu.fpr[i], 0, fpr_val); | |
91 | } | |
92 | err |= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr); | |
93 | ||
94 | return err; | |
95 | } | |
96 | ||
c3fc4ab3 FBH |
97 | /* |
98 | * Helper routines | |
99 | */ | |
faea6234 AN |
100 | static int protected_save_fp_context(struct sigcontext __user *sc) |
101 | { | |
102 | int err; | |
103 | while (1) { | |
104 | lock_fpu_owner(); | |
597ce172 PB |
105 | err = own_fpu_inatomic(1); |
106 | if (!err) | |
107 | err = save_fp_context(sc); /* this might fail */ | |
faea6234 AN |
108 | unlock_fpu_owner(); |
109 | if (likely(!err)) | |
110 | break; | |
111 | /* touch the sigcontext and try again */ | |
112 | err = __put_user(0, &sc->sc_fpregs[0]) | | |
113 | __put_user(0, &sc->sc_fpregs[31]) | | |
114 | __put_user(0, &sc->sc_fpc_csr); | |
115 | if (err) | |
116 | break; /* really bad sigcontext */ | |
117 | } | |
118 | return err; | |
119 | } | |
120 | ||
121 | static int protected_restore_fp_context(struct sigcontext __user *sc) | |
122 | { | |
c726b822 | 123 | int err, tmp __maybe_unused; |
faea6234 AN |
124 | while (1) { |
125 | lock_fpu_owner(); | |
597ce172 PB |
126 | err = own_fpu_inatomic(0); |
127 | if (!err) | |
128 | err = restore_fp_context(sc); /* this might fail */ | |
faea6234 AN |
129 | unlock_fpu_owner(); |
130 | if (likely(!err)) | |
131 | break; | |
132 | /* touch the sigcontext and try again */ | |
133 | err = __get_user(tmp, &sc->sc_fpregs[0]) | | |
134 | __get_user(tmp, &sc->sc_fpregs[31]) | | |
135 | __get_user(tmp, &sc->sc_fpc_csr); | |
136 | if (err) | |
137 | break; /* really bad sigcontext */ | |
138 | } | |
139 | return err; | |
140 | } | |
141 | ||
c3fc4ab3 FBH |
142 | int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
143 | { | |
144 | int err = 0; | |
145 | int i; | |
53dc8028 | 146 | unsigned int used_math; |
c3fc4ab3 FBH |
147 | |
148 | err |= __put_user(regs->cp0_epc, &sc->sc_pc); | |
149 | ||
150 | err |= __put_user(0, &sc->sc_regs[0]); | |
151 | for (i = 1; i < 32; i++) | |
152 | err |= __put_user(regs->regs[i], &sc->sc_regs[i]); | |
153 | ||
9693a853 FBH |
154 | #ifdef CONFIG_CPU_HAS_SMARTMIPS |
155 | err |= __put_user(regs->acx, &sc->sc_acx); | |
156 | #endif | |
c3fc4ab3 FBH |
157 | err |= __put_user(regs->hi, &sc->sc_mdhi); |
158 | err |= __put_user(regs->lo, &sc->sc_mdlo); | |
159 | if (cpu_has_dsp) { | |
160 | err |= __put_user(mfhi1(), &sc->sc_hi1); | |
161 | err |= __put_user(mflo1(), &sc->sc_lo1); | |
162 | err |= __put_user(mfhi2(), &sc->sc_hi2); | |
163 | err |= __put_user(mflo2(), &sc->sc_lo2); | |
164 | err |= __put_user(mfhi3(), &sc->sc_hi3); | |
165 | err |= __put_user(mflo3(), &sc->sc_lo3); | |
166 | err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); | |
167 | } | |
168 | ||
53dc8028 AN |
169 | used_math = !!used_math(); |
170 | err |= __put_user(used_math, &sc->sc_used_math); | |
c3fc4ab3 | 171 | |
53dc8028 | 172 | if (used_math) { |
c3fc4ab3 FBH |
173 | /* |
174 | * Save FPU state to signal context. Signal handler | |
175 | * will "inherit" current FPU state. | |
176 | */ | |
faea6234 | 177 | err |= protected_save_fp_context(sc); |
c3fc4ab3 FBH |
178 | } |
179 | return err; | |
180 | } | |
181 | ||
c6a2f467 AN |
182 | int fpcsr_pending(unsigned int __user *fpcsr) |
183 | { | |
184 | int err, sig = 0; | |
185 | unsigned int csr, enabled; | |
186 | ||
187 | err = __get_user(csr, fpcsr); | |
188 | enabled = FPU_CSR_UNI_X | ((csr & FPU_CSR_ALL_E) << 5); | |
189 | /* | |
190 | * If the signal handler set some FPU exceptions, clear it and | |
191 | * send SIGFPE. | |
192 | */ | |
193 | if (csr & enabled) { | |
194 | csr &= ~enabled; | |
195 | err |= __put_user(csr, fpcsr); | |
196 | sig = SIGFPE; | |
197 | } | |
198 | return err ?: sig; | |
199 | } | |
200 | ||
201 | static int | |
202 | check_and_restore_fp_context(struct sigcontext __user *sc) | |
203 | { | |
204 | int err, sig; | |
205 | ||
206 | err = sig = fpcsr_pending(&sc->sc_fpc_csr); | |
207 | if (err > 0) | |
208 | err = 0; | |
faea6234 | 209 | err |= protected_restore_fp_context(sc); |
c6a2f467 AN |
210 | return err ?: sig; |
211 | } | |
212 | ||
c3fc4ab3 FBH |
213 | int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
214 | { | |
215 | unsigned int used_math; | |
216 | unsigned long treg; | |
217 | int err = 0; | |
218 | int i; | |
219 | ||
220 | /* Always make any pending restarted system calls return -EINTR */ | |
221 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
222 | ||
223 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); | |
9693a853 FBH |
224 | |
225 | #ifdef CONFIG_CPU_HAS_SMARTMIPS | |
226 | err |= __get_user(regs->acx, &sc->sc_acx); | |
227 | #endif | |
c3fc4ab3 FBH |
228 | err |= __get_user(regs->hi, &sc->sc_mdhi); |
229 | err |= __get_user(regs->lo, &sc->sc_mdlo); | |
230 | if (cpu_has_dsp) { | |
231 | err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); | |
232 | err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); | |
233 | err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); | |
234 | err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); | |
235 | err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); | |
236 | err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); | |
237 | err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); | |
238 | } | |
239 | ||
240 | for (i = 1; i < 32; i++) | |
241 | err |= __get_user(regs->regs[i], &sc->sc_regs[i]); | |
242 | ||
243 | err |= __get_user(used_math, &sc->sc_used_math); | |
244 | conditional_used_math(used_math); | |
245 | ||
53dc8028 | 246 | if (used_math) { |
c3fc4ab3 | 247 | /* restore fpu context if we have used it before */ |
c6a2f467 AN |
248 | if (!err) |
249 | err = check_and_restore_fp_context(sc); | |
c3fc4ab3 FBH |
250 | } else { |
251 | /* signal handler may have used FPU. Give it up. */ | |
53dc8028 | 252 | lose_fpu(0); |
c3fc4ab3 FBH |
253 | } |
254 | ||
c3fc4ab3 FBH |
255 | return err; |
256 | } | |
257 | ||
258 | void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, | |
259 | size_t frame_size) | |
260 | { | |
261 | unsigned long sp; | |
262 | ||
263 | /* Default to using normal stack */ | |
264 | sp = regs->regs[29]; | |
265 | ||
266 | /* | |
267 | * FPU emulator may have it's own trampoline active just | |
268 | * above the user stack, 16-bytes before the next lowest | |
269 | * 16 byte boundary. Try to avoid trashing it. | |
270 | */ | |
271 | sp -= 32; | |
272 | ||
273 | /* This is the X/Open sanctioned signal stack switching. */ | |
274 | if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0)) | |
275 | sp = current->sas_ss_sp + current->sas_ss_size; | |
276 | ||
277 | return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK)); | |
278 | } | |
279 | ||
1da177e4 LT |
280 | /* |
281 | * Atomically swap in the new signal mask, and wait for a signal. | |
282 | */ | |
283 | ||
284 | #ifdef CONFIG_TRAD_SIGNALS | |
1910f4ab | 285 | SYSCALL_DEFINE1(sigsuspend, sigset_t __user *, uset) |
1da177e4 | 286 | { |
1910f4ab | 287 | return sys_rt_sigsuspend(uset, sizeof(sigset_t)); |
1da177e4 LT |
288 | } |
289 | #endif | |
290 | ||
1da177e4 | 291 | #ifdef CONFIG_TRAD_SIGNALS |
dbda6ac0 RB |
292 | SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act, |
293 | struct sigaction __user *, oact) | |
1da177e4 LT |
294 | { |
295 | struct k_sigaction new_ka, old_ka; | |
296 | int ret; | |
297 | int err = 0; | |
298 | ||
299 | if (act) { | |
300 | old_sigset_t mask; | |
301 | ||
302 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
303 | return -EFAULT; | |
304 | err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler); | |
305 | err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
306 | err |= __get_user(mask, &act->sa_mask.sig[0]); | |
307 | if (err) | |
308 | return -EFAULT; | |
309 | ||
310 | siginitset(&new_ka.sa.sa_mask, mask); | |
311 | } | |
312 | ||
313 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
314 | ||
315 | if (!ret && oact) { | |
316 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
e0daad44 | 317 | return -EFAULT; |
1da177e4 LT |
318 | err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
319 | err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler); | |
320 | err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); | |
321 | err |= __put_user(0, &oact->sa_mask.sig[1]); | |
322 | err |= __put_user(0, &oact->sa_mask.sig[2]); | |
323 | err |= __put_user(0, &oact->sa_mask.sig[3]); | |
324 | if (err) | |
325 | return -EFAULT; | |
326 | } | |
327 | ||
328 | return ret; | |
329 | } | |
330 | #endif | |
331 | ||
1da177e4 | 332 | #ifdef CONFIG_TRAD_SIGNALS |
f90080a0 | 333 | asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 334 | { |
9bbf28a3 | 335 | struct sigframe __user *frame; |
1da177e4 | 336 | sigset_t blocked; |
c6a2f467 | 337 | int sig; |
1da177e4 | 338 | |
9bbf28a3 | 339 | frame = (struct sigframe __user *) regs.regs[29]; |
1da177e4 LT |
340 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
341 | goto badframe; | |
342 | if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked))) | |
343 | goto badframe; | |
344 | ||
8598f3cd | 345 | set_current_blocked(&blocked); |
1da177e4 | 346 | |
c6a2f467 AN |
347 | sig = restore_sigcontext(®s, &frame->sf_sc); |
348 | if (sig < 0) | |
1da177e4 | 349 | goto badframe; |
c6a2f467 AN |
350 | else if (sig) |
351 | force_sig(sig, current); | |
1da177e4 LT |
352 | |
353 | /* | |
354 | * Don't let your children do this ... | |
355 | */ | |
1da177e4 LT |
356 | __asm__ __volatile__( |
357 | "move\t$29, %0\n\t" | |
358 | "j\tsyscall_exit" | |
359 | :/* no outputs */ | |
360 | :"r" (®s)); | |
361 | /* Unreached */ | |
362 | ||
363 | badframe: | |
364 | force_sig(SIGSEGV, current); | |
365 | } | |
e50c0a8f | 366 | #endif /* CONFIG_TRAD_SIGNALS */ |
1da177e4 | 367 | |
f90080a0 | 368 | asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 369 | { |
9bbf28a3 | 370 | struct rt_sigframe __user *frame; |
1da177e4 | 371 | sigset_t set; |
c6a2f467 | 372 | int sig; |
1da177e4 | 373 | |
9bbf28a3 | 374 | frame = (struct rt_sigframe __user *) regs.regs[29]; |
1da177e4 LT |
375 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
376 | goto badframe; | |
377 | if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) | |
378 | goto badframe; | |
379 | ||
8598f3cd | 380 | set_current_blocked(&set); |
1da177e4 | 381 | |
c6a2f467 AN |
382 | sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext); |
383 | if (sig < 0) | |
1da177e4 | 384 | goto badframe; |
c6a2f467 AN |
385 | else if (sig) |
386 | force_sig(sig, current); | |
1da177e4 | 387 | |
ea536ad4 AV |
388 | if (restore_altstack(&frame->rs_uc.uc_stack)) |
389 | goto badframe; | |
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 | 449 | static int setup_rt_frame(void *sig_return, struct k_sigaction *ka, |
70342287 | 450 | struct pt_regs *regs, int signr, sigset_t *set, |
d814c28c | 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 | ||
70342287 | 463 | /* Create the ucontext. */ |
1da177e4 | 464 | err |= __put_user(0, &frame->rs_uc.uc_flags); |
5665a0ac | 465 | err |= __put_user(NULL, &frame->rs_uc.uc_link); |
ea536ad4 | 466 | err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]); |
1da177e4 LT |
467 | err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); |
468 | err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); | |
469 | ||
470 | if (err) | |
471 | goto give_sigsegv; | |
472 | ||
473 | /* | |
474 | * Arguments to signal handler: | |
475 | * | |
476 | * a0 = signal number | |
477 | * a1 = 0 (should be cause) | |
478 | * a2 = pointer to ucontext | |
479 | * | |
480 | * $25 and c0_epc point to the signal handler, $29 points to | |
481 | * the struct rt_sigframe. | |
482 | */ | |
483 | regs->regs[ 4] = signr; | |
484 | regs->regs[ 5] = (unsigned long) &frame->rs_info; | |
485 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
486 | regs->regs[29] = (unsigned long) frame; | |
d814c28c | 487 | regs->regs[31] = (unsigned long) sig_return; |
1da177e4 LT |
488 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; |
489 | ||
722bb63d | 490 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 LT |
491 | current->comm, current->pid, |
492 | frame, regs->cp0_epc, regs->regs[31]); | |
722bb63d | 493 | |
7b3e2fc8 | 494 | return 0; |
1da177e4 LT |
495 | |
496 | give_sigsegv: | |
497 | force_sigsegv(signr, current); | |
7b3e2fc8 | 498 | return -EFAULT; |
1da177e4 LT |
499 | } |
500 | ||
151fd6ac RB |
501 | struct mips_abi mips_abi = { |
502 | #ifdef CONFIG_TRAD_SIGNALS | |
503 | .setup_frame = setup_frame, | |
d814c28c | 504 | .signal_return_offset = offsetof(struct mips_vdso, signal_trampoline), |
151fd6ac | 505 | #endif |
70342287 | 506 | .setup_rt_frame = setup_rt_frame, |
d814c28c DD |
507 | .rt_signal_return_offset = |
508 | offsetof(struct mips_vdso, rt_signal_trampoline), | |
151fd6ac RB |
509 | .restart = __NR_restart_syscall |
510 | }; | |
511 | ||
a610d6e6 | 512 | static void handle_signal(unsigned long sig, siginfo_t *info, |
b7f9a11a | 513 | struct k_sigaction *ka, struct pt_regs *regs) |
1da177e4 | 514 | { |
b7f9a11a | 515 | sigset_t *oldset = sigmask_to_save(); |
129bc8f7 | 516 | int ret; |
d814c28c | 517 | struct mips_abi *abi = current->thread.abi; |
01be057b DL |
518 | #ifdef CONFIG_CPU_MICROMIPS |
519 | void *vdso; | |
520 | unsigned int tmp = (unsigned int)current->mm->context.vdso; | |
521 | ||
522 | set_isa16_mode(tmp); | |
523 | vdso = (void *)tmp; | |
524 | #else | |
d814c28c | 525 | void *vdso = current->mm->context.vdso; |
01be057b | 526 | #endif |
129bc8f7 | 527 | |
8f5a00eb AV |
528 | if (regs->regs[0]) { |
529 | switch(regs->regs[2]) { | |
530 | case ERESTART_RESTARTBLOCK: | |
531 | case ERESTARTNOHAND: | |
1da177e4 LT |
532 | regs->regs[2] = EINTR; |
533 | break; | |
8f5a00eb AV |
534 | case ERESTARTSYS: |
535 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
536 | regs->regs[2] = EINTR; | |
537 | break; | |
538 | } | |
539 | /* fallthrough */ | |
540 | case ERESTARTNOINTR: | |
541 | regs->regs[7] = regs->regs[26]; | |
542 | regs->regs[2] = regs->regs[0]; | |
543 | regs->cp0_epc -= 4; | |
1da177e4 | 544 | } |
1da177e4 | 545 | |
70342287 | 546 | regs->regs[0] = 0; /* Don't deal with this again. */ |
8f5a00eb | 547 | } |
1da177e4 | 548 | |
e50c0a8f | 549 | if (sig_uses_siginfo(ka)) |
d814c28c DD |
550 | ret = abi->setup_rt_frame(vdso + abi->rt_signal_return_offset, |
551 | ka, regs, sig, oldset, info); | |
1da177e4 | 552 | else |
d814c28c DD |
553 | ret = abi->setup_frame(vdso + abi->signal_return_offset, |
554 | ka, regs, sig, oldset); | |
1da177e4 | 555 | |
062ab57b | 556 | if (ret) |
a610d6e6 | 557 | return; |
062ab57b | 558 | |
efee984c | 559 | signal_delivered(sig, info, ka, regs, 0); |
1da177e4 LT |
560 | } |
561 | ||
151fd6ac | 562 | static void do_signal(struct pt_regs *regs) |
1da177e4 LT |
563 | { |
564 | struct k_sigaction ka; | |
565 | siginfo_t info; | |
566 | int signr; | |
567 | ||
1da177e4 | 568 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
7b3e2fc8 | 569 | if (signr > 0) { |
70342287 | 570 | /* Whee! Actually deliver the signal. */ |
a610d6e6 | 571 | handle_signal(signr, &info, &ka, regs); |
45887e12 | 572 | return; |
7b3e2fc8 | 573 | } |
1da177e4 | 574 | |
1da177e4 | 575 | if (regs->regs[0]) { |
9ec9b5ac RB |
576 | switch (regs->regs[2]) { |
577 | case ERESTARTNOHAND: | |
578 | case ERESTARTSYS: | |
579 | case ERESTARTNOINTR: | |
8f5a00eb | 580 | regs->regs[2] = regs->regs[0]; |
1da177e4 | 581 | regs->regs[7] = regs->regs[26]; |
8f5a00eb | 582 | regs->cp0_epc -= 4; |
9ec9b5ac RB |
583 | break; |
584 | ||
585 | case ERESTART_RESTARTBLOCK: | |
151fd6ac | 586 | regs->regs[2] = current->thread.abi->restart; |
1da177e4 LT |
587 | regs->regs[7] = regs->regs[26]; |
588 | regs->cp0_epc -= 4; | |
9ec9b5ac | 589 | break; |
1da177e4 | 590 | } |
70342287 | 591 | regs->regs[0] = 0; /* Don't deal with this again. */ |
1da177e4 | 592 | } |
7b3e2fc8 RB |
593 | |
594 | /* | |
595 | * If there's no signal to deliver, we just put the saved sigmask | |
596 | * back | |
597 | */ | |
51a7b448 | 598 | restore_saved_sigmask(); |
1da177e4 LT |
599 | } |
600 | ||
601 | /* | |
602 | * notification of userspace execution resumption | |
7b3e2fc8 | 603 | * - triggered by the TIF_WORK_MASK flags |
1da177e4 | 604 | */ |
7b3e2fc8 | 605 | asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, |
1da177e4 LT |
606 | __u32 thread_info_flags) |
607 | { | |
1f717929 RB |
608 | local_irq_enable(); |
609 | ||
c3fc5cd5 RB |
610 | user_exit(); |
611 | ||
1da177e4 | 612 | /* deal with pending signal delivery */ |
6fd84c08 | 613 | if (thread_info_flags & _TIF_SIGPENDING) |
151fd6ac | 614 | do_signal(regs); |
d0420c83 DH |
615 | |
616 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { | |
617 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
618 | tracehook_notify_resume(regs); | |
619 | } | |
c3fc5cd5 RB |
620 | |
621 | user_enter(); | |
1da177e4 | 622 | } |
137f6f3e RB |
623 | |
624 | #ifdef CONFIG_SMP | |
625 | static int smp_save_fp_context(struct sigcontext __user *sc) | |
626 | { | |
627 | return raw_cpu_has_fpu | |
628 | ? _save_fp_context(sc) | |
b2ead528 | 629 | : copy_fp_to_sigcontext(sc); |
137f6f3e RB |
630 | } |
631 | ||
632 | static int smp_restore_fp_context(struct sigcontext __user *sc) | |
633 | { | |
634 | return raw_cpu_has_fpu | |
635 | ? _restore_fp_context(sc) | |
b2ead528 | 636 | : copy_fp_from_sigcontext(sc); |
137f6f3e RB |
637 | } |
638 | #endif | |
639 | ||
640 | static int signal_setup(void) | |
641 | { | |
642 | #ifdef CONFIG_SMP | |
643 | /* For now just do the cpu_has_fpu check when the functions are invoked */ | |
644 | save_fp_context = smp_save_fp_context; | |
645 | restore_fp_context = smp_restore_fp_context; | |
646 | #else | |
647 | if (cpu_has_fpu) { | |
648 | save_fp_context = _save_fp_context; | |
649 | restore_fp_context = _restore_fp_context; | |
650 | } else { | |
b2ead528 PB |
651 | save_fp_context = copy_fp_from_sigcontext; |
652 | restore_fp_context = copy_fp_to_sigcontext; | |
137f6f3e RB |
653 | } |
654 | #endif | |
655 | ||
656 | return 0; | |
657 | } | |
658 | ||
659 | arch_initcall(signal_setup); |