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. | |
ca750649 | 9 | * Copyright (C) 2014, Imagination Technologies Ltd. |
1da177e4 | 10 | */ |
02416dcf | 11 | #include <linux/cache.h> |
c3fc5cd5 | 12 | #include <linux/context_tracking.h> |
1f717929 | 13 | #include <linux/irqflags.h> |
1da177e4 LT |
14 | #include <linux/sched.h> |
15 | #include <linux/mm.h> | |
16 | #include <linux/personality.h> | |
17 | #include <linux/smp.h> | |
1da177e4 LT |
18 | #include <linux/kernel.h> |
19 | #include <linux/signal.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/wait.h> | |
22 | #include <linux/ptrace.h> | |
23 | #include <linux/unistd.h> | |
24 | #include <linux/compiler.h> | |
dbda6ac0 | 25 | #include <linux/syscalls.h> |
faea6234 | 26 | #include <linux/uaccess.h> |
733e5e4b | 27 | #include <linux/tracehook.h> |
1da177e4 | 28 | |
e50c0a8f | 29 | #include <asm/abi.h> |
1da177e4 LT |
30 | #include <asm/asm.h> |
31 | #include <linux/bitops.h> | |
32 | #include <asm/cacheflush.h> | |
33 | #include <asm/fpu.h> | |
34 | #include <asm/sim.h> | |
1da177e4 LT |
35 | #include <asm/ucontext.h> |
36 | #include <asm/cpu-features.h> | |
02416dcf | 37 | #include <asm/war.h> |
d814c28c | 38 | #include <asm/vdso.h> |
b81947c6 | 39 | #include <asm/dsp.h> |
01be057b | 40 | #include <asm/inst.h> |
1da177e4 LT |
41 | |
42 | #include "signal-common.h" | |
43 | ||
137f6f3e RB |
44 | static int (*save_fp_context)(struct sigcontext __user *sc); |
45 | static int (*restore_fp_context)(struct sigcontext __user *sc); | |
46 | ||
47 | extern asmlinkage int _save_fp_context(struct sigcontext __user *sc); | |
48 | extern asmlinkage int _restore_fp_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 | ||
b2ead528 PB |
64 | /* |
65 | * Thread saved context copy to/from a signal context presumed to be on the | |
66 | * user stack, and therefore accessed with appropriate macros from uaccess.h. | |
67 | */ | |
68 | static int copy_fp_to_sigcontext(struct sigcontext __user *sc) | |
69 | { | |
70 | int i; | |
71 | int err = 0; | |
72 | ||
6bbfd65e | 73 | for (i = 0; i < NUM_FPU_REGS; i++) { |
b2ead528 PB |
74 | err |= |
75 | __put_user(get_fpr64(¤t->thread.fpu.fpr[i], 0), | |
76 | &sc->sc_fpregs[i]); | |
77 | } | |
78 | err |= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr); | |
79 | ||
80 | return err; | |
81 | } | |
82 | ||
83 | static int copy_fp_from_sigcontext(struct sigcontext __user *sc) | |
84 | { | |
85 | int i; | |
86 | int err = 0; | |
87 | u64 fpr_val; | |
88 | ||
6bbfd65e | 89 | for (i = 0; i < NUM_FPU_REGS; i++) { |
b2ead528 PB |
90 | err |= __get_user(fpr_val, &sc->sc_fpregs[i]); |
91 | set_fpr64(¤t->thread.fpu.fpr[i], 0, fpr_val); | |
92 | } | |
93 | err |= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr); | |
94 | ||
95 | return err; | |
96 | } | |
97 | ||
c3fc4ab3 FBH |
98 | /* |
99 | * Helper routines | |
100 | */ | |
16f77de8 | 101 | static int protected_save_fp_context(struct sigcontext __user *sc) |
faea6234 AN |
102 | { |
103 | int err; | |
ca750649 | 104 | #ifndef CONFIG_EVA |
faea6234 AN |
105 | while (1) { |
106 | lock_fpu_owner(); | |
ff3aa5f2 PB |
107 | if (is_fpu_owner()) { |
108 | err = save_fp_context(sc); | |
109 | unlock_fpu_owner(); | |
110 | } else { | |
111 | unlock_fpu_owner(); | |
112 | err = copy_fp_to_sigcontext(sc); | |
113 | } | |
faea6234 AN |
114 | if (likely(!err)) |
115 | break; | |
116 | /* touch the sigcontext and try again */ | |
117 | err = __put_user(0, &sc->sc_fpregs[0]) | | |
118 | __put_user(0, &sc->sc_fpregs[31]) | | |
119 | __put_user(0, &sc->sc_fpc_csr); | |
120 | if (err) | |
121 | break; /* really bad sigcontext */ | |
122 | } | |
ca750649 LY |
123 | #else |
124 | /* | |
125 | * EVA does not have FPU EVA instructions so saving fpu context directly | |
126 | * does not work. | |
127 | */ | |
ca750649 LY |
128 | lose_fpu(1); |
129 | err = save_fp_context(sc); /* this might fail */ | |
ca750649 | 130 | #endif |
faea6234 AN |
131 | return err; |
132 | } | |
133 | ||
16f77de8 | 134 | static int protected_restore_fp_context(struct sigcontext __user *sc) |
faea6234 | 135 | { |
c726b822 | 136 | int err, tmp __maybe_unused; |
ca750649 | 137 | #ifndef CONFIG_EVA |
faea6234 AN |
138 | while (1) { |
139 | lock_fpu_owner(); | |
ff3aa5f2 PB |
140 | if (is_fpu_owner()) { |
141 | err = restore_fp_context(sc); | |
142 | unlock_fpu_owner(); | |
143 | } else { | |
144 | unlock_fpu_owner(); | |
145 | err = copy_fp_from_sigcontext(sc); | |
146 | } | |
faea6234 AN |
147 | if (likely(!err)) |
148 | break; | |
149 | /* touch the sigcontext and try again */ | |
150 | err = __get_user(tmp, &sc->sc_fpregs[0]) | | |
151 | __get_user(tmp, &sc->sc_fpregs[31]) | | |
152 | __get_user(tmp, &sc->sc_fpc_csr); | |
153 | if (err) | |
154 | break; /* really bad sigcontext */ | |
155 | } | |
ca750649 LY |
156 | #else |
157 | /* | |
158 | * EVA does not have FPU EVA instructions so restoring fpu context | |
159 | * directly does not work. | |
160 | */ | |
ca750649 LY |
161 | lose_fpu(0); |
162 | err = restore_fp_context(sc); /* this might fail */ | |
ca750649 | 163 | #endif |
faea6234 AN |
164 | return err; |
165 | } | |
166 | ||
c3fc4ab3 FBH |
167 | int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
168 | { | |
169 | int err = 0; | |
170 | int i; | |
53dc8028 | 171 | unsigned int used_math; |
c3fc4ab3 FBH |
172 | |
173 | err |= __put_user(regs->cp0_epc, &sc->sc_pc); | |
174 | ||
175 | err |= __put_user(0, &sc->sc_regs[0]); | |
176 | for (i = 1; i < 32; i++) | |
177 | err |= __put_user(regs->regs[i], &sc->sc_regs[i]); | |
178 | ||
9693a853 FBH |
179 | #ifdef CONFIG_CPU_HAS_SMARTMIPS |
180 | err |= __put_user(regs->acx, &sc->sc_acx); | |
181 | #endif | |
c3fc4ab3 FBH |
182 | err |= __put_user(regs->hi, &sc->sc_mdhi); |
183 | err |= __put_user(regs->lo, &sc->sc_mdlo); | |
184 | if (cpu_has_dsp) { | |
185 | err |= __put_user(mfhi1(), &sc->sc_hi1); | |
186 | err |= __put_user(mflo1(), &sc->sc_lo1); | |
187 | err |= __put_user(mfhi2(), &sc->sc_hi2); | |
188 | err |= __put_user(mflo2(), &sc->sc_lo2); | |
189 | err |= __put_user(mfhi3(), &sc->sc_hi3); | |
190 | err |= __put_user(mflo3(), &sc->sc_lo3); | |
191 | err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); | |
192 | } | |
193 | ||
16f77de8 | 194 | used_math = !!used_math(); |
53dc8028 | 195 | err |= __put_user(used_math, &sc->sc_used_math); |
c3fc4ab3 | 196 | |
53dc8028 | 197 | if (used_math) { |
c3fc4ab3 FBH |
198 | /* |
199 | * Save FPU state to signal context. Signal handler | |
200 | * will "inherit" current FPU state. | |
201 | */ | |
16f77de8 | 202 | err |= protected_save_fp_context(sc); |
c3fc4ab3 FBH |
203 | } |
204 | return err; | |
205 | } | |
206 | ||
c6a2f467 AN |
207 | int fpcsr_pending(unsigned int __user *fpcsr) |
208 | { | |
209 | int err, sig = 0; | |
210 | unsigned int csr, enabled; | |
211 | ||
212 | err = __get_user(csr, fpcsr); | |
213 | enabled = FPU_CSR_UNI_X | ((csr & FPU_CSR_ALL_E) << 5); | |
214 | /* | |
215 | * If the signal handler set some FPU exceptions, clear it and | |
216 | * send SIGFPE. | |
217 | */ | |
218 | if (csr & enabled) { | |
219 | csr &= ~enabled; | |
220 | err |= __put_user(csr, fpcsr); | |
221 | sig = SIGFPE; | |
222 | } | |
223 | return err ?: sig; | |
224 | } | |
225 | ||
226 | static int | |
16f77de8 | 227 | check_and_restore_fp_context(struct sigcontext __user *sc) |
c6a2f467 AN |
228 | { |
229 | int err, sig; | |
230 | ||
231 | err = sig = fpcsr_pending(&sc->sc_fpc_csr); | |
232 | if (err > 0) | |
233 | err = 0; | |
16f77de8 | 234 | err |= protected_restore_fp_context(sc); |
c6a2f467 AN |
235 | return err ?: sig; |
236 | } | |
237 | ||
c3fc4ab3 FBH |
238 | int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
239 | { | |
240 | unsigned int used_math; | |
241 | unsigned long treg; | |
242 | int err = 0; | |
243 | int i; | |
244 | ||
245 | /* Always make any pending restarted system calls return -EINTR */ | |
246 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
247 | ||
248 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); | |
9693a853 FBH |
249 | |
250 | #ifdef CONFIG_CPU_HAS_SMARTMIPS | |
251 | err |= __get_user(regs->acx, &sc->sc_acx); | |
252 | #endif | |
c3fc4ab3 FBH |
253 | err |= __get_user(regs->hi, &sc->sc_mdhi); |
254 | err |= __get_user(regs->lo, &sc->sc_mdlo); | |
255 | if (cpu_has_dsp) { | |
256 | err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); | |
257 | err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); | |
258 | err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); | |
259 | err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); | |
260 | err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); | |
261 | err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); | |
262 | err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); | |
263 | } | |
264 | ||
265 | for (i = 1; i < 32; i++) | |
266 | err |= __get_user(regs->regs[i], &sc->sc_regs[i]); | |
267 | ||
268 | err |= __get_user(used_math, &sc->sc_used_math); | |
269 | conditional_used_math(used_math); | |
270 | ||
53dc8028 | 271 | if (used_math) { |
c3fc4ab3 | 272 | /* restore fpu context if we have used it before */ |
c6a2f467 | 273 | if (!err) |
16f77de8 | 274 | err = check_and_restore_fp_context(sc); |
c3fc4ab3 | 275 | } else { |
16f77de8 | 276 | /* signal handler may have used FPU. Give it up. */ |
53dc8028 | 277 | lose_fpu(0); |
c3fc4ab3 FBH |
278 | } |
279 | ||
c3fc4ab3 FBH |
280 | return err; |
281 | } | |
282 | ||
7c4f5635 | 283 | void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, |
c3fc4ab3 FBH |
284 | size_t frame_size) |
285 | { | |
286 | unsigned long sp; | |
287 | ||
288 | /* Default to using normal stack */ | |
289 | sp = regs->regs[29]; | |
290 | ||
291 | /* | |
292 | * FPU emulator may have it's own trampoline active just | |
293 | * above the user stack, 16-bytes before the next lowest | |
294 | * 16 byte boundary. Try to avoid trashing it. | |
295 | */ | |
296 | sp -= 32; | |
297 | ||
7c4f5635 | 298 | sp = sigsp(sp, ksig); |
c3fc4ab3 FBH |
299 | |
300 | return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK)); | |
301 | } | |
302 | ||
1da177e4 LT |
303 | /* |
304 | * Atomically swap in the new signal mask, and wait for a signal. | |
305 | */ | |
306 | ||
307 | #ifdef CONFIG_TRAD_SIGNALS | |
1910f4ab | 308 | SYSCALL_DEFINE1(sigsuspend, sigset_t __user *, uset) |
1da177e4 | 309 | { |
1910f4ab | 310 | return sys_rt_sigsuspend(uset, sizeof(sigset_t)); |
1da177e4 LT |
311 | } |
312 | #endif | |
313 | ||
1da177e4 | 314 | #ifdef CONFIG_TRAD_SIGNALS |
dbda6ac0 RB |
315 | SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act, |
316 | struct sigaction __user *, oact) | |
1da177e4 LT |
317 | { |
318 | struct k_sigaction new_ka, old_ka; | |
319 | int ret; | |
320 | int err = 0; | |
321 | ||
322 | if (act) { | |
323 | old_sigset_t mask; | |
324 | ||
325 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
326 | return -EFAULT; | |
327 | err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler); | |
328 | err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
329 | err |= __get_user(mask, &act->sa_mask.sig[0]); | |
330 | if (err) | |
331 | return -EFAULT; | |
332 | ||
333 | siginitset(&new_ka.sa.sa_mask, mask); | |
334 | } | |
335 | ||
336 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
337 | ||
338 | if (!ret && oact) { | |
339 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
e0daad44 | 340 | return -EFAULT; |
1da177e4 LT |
341 | err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
342 | err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler); | |
343 | err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); | |
344 | err |= __put_user(0, &oact->sa_mask.sig[1]); | |
345 | err |= __put_user(0, &oact->sa_mask.sig[2]); | |
346 | err |= __put_user(0, &oact->sa_mask.sig[3]); | |
347 | if (err) | |
348 | return -EFAULT; | |
349 | } | |
350 | ||
351 | return ret; | |
352 | } | |
353 | #endif | |
354 | ||
1da177e4 | 355 | #ifdef CONFIG_TRAD_SIGNALS |
f90080a0 | 356 | asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 357 | { |
9bbf28a3 | 358 | struct sigframe __user *frame; |
1da177e4 | 359 | sigset_t blocked; |
c6a2f467 | 360 | int sig; |
1da177e4 | 361 | |
9bbf28a3 | 362 | frame = (struct sigframe __user *) regs.regs[29]; |
1da177e4 LT |
363 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
364 | goto badframe; | |
365 | if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked))) | |
366 | goto badframe; | |
367 | ||
8598f3cd | 368 | set_current_blocked(&blocked); |
1da177e4 | 369 | |
c6a2f467 AN |
370 | sig = restore_sigcontext(®s, &frame->sf_sc); |
371 | if (sig < 0) | |
1da177e4 | 372 | goto badframe; |
c6a2f467 AN |
373 | else if (sig) |
374 | force_sig(sig, current); | |
1da177e4 LT |
375 | |
376 | /* | |
377 | * Don't let your children do this ... | |
378 | */ | |
1da177e4 LT |
379 | __asm__ __volatile__( |
380 | "move\t$29, %0\n\t" | |
381 | "j\tsyscall_exit" | |
382 | :/* no outputs */ | |
383 | :"r" (®s)); | |
384 | /* Unreached */ | |
385 | ||
386 | badframe: | |
387 | force_sig(SIGSEGV, current); | |
388 | } | |
e50c0a8f | 389 | #endif /* CONFIG_TRAD_SIGNALS */ |
1da177e4 | 390 | |
f90080a0 | 391 | asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 392 | { |
9bbf28a3 | 393 | struct rt_sigframe __user *frame; |
1da177e4 | 394 | sigset_t set; |
c6a2f467 | 395 | int sig; |
1da177e4 | 396 | |
9bbf28a3 | 397 | frame = (struct rt_sigframe __user *) regs.regs[29]; |
1da177e4 LT |
398 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
399 | goto badframe; | |
400 | if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) | |
401 | goto badframe; | |
402 | ||
8598f3cd | 403 | set_current_blocked(&set); |
1da177e4 | 404 | |
c6a2f467 AN |
405 | sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext); |
406 | if (sig < 0) | |
1da177e4 | 407 | goto badframe; |
c6a2f467 AN |
408 | else if (sig) |
409 | force_sig(sig, current); | |
1da177e4 | 410 | |
ea536ad4 AV |
411 | if (restore_altstack(&frame->rs_uc.uc_stack)) |
412 | goto badframe; | |
1da177e4 LT |
413 | |
414 | /* | |
415 | * Don't let your children do this ... | |
416 | */ | |
417 | __asm__ __volatile__( | |
418 | "move\t$29, %0\n\t" | |
419 | "j\tsyscall_exit" | |
420 | :/* no outputs */ | |
421 | :"r" (®s)); | |
422 | /* Unreached */ | |
423 | ||
424 | badframe: | |
425 | force_sig(SIGSEGV, current); | |
426 | } | |
427 | ||
428 | #ifdef CONFIG_TRAD_SIGNALS | |
81d103bf RW |
429 | static int setup_frame(void *sig_return, struct ksignal *ksig, |
430 | struct pt_regs *regs, sigset_t *set) | |
1da177e4 | 431 | { |
9bbf28a3 | 432 | struct sigframe __user *frame; |
1da177e4 LT |
433 | int err = 0; |
434 | ||
7c4f5635 | 435 | frame = get_sigframe(ksig, regs, sizeof(*frame)); |
1da177e4 | 436 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) |
81d103bf | 437 | return -EFAULT; |
1da177e4 | 438 | |
1da177e4 LT |
439 | err |= setup_sigcontext(regs, &frame->sf_sc); |
440 | err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set)); | |
441 | if (err) | |
81d103bf | 442 | return -EFAULT; |
1da177e4 LT |
443 | |
444 | /* | |
445 | * Arguments to signal handler: | |
446 | * | |
447 | * a0 = signal number | |
448 | * a1 = 0 (should be cause) | |
449 | * a2 = pointer to struct sigcontext | |
450 | * | |
451 | * $25 and c0_epc point to the signal handler, $29 points to the | |
452 | * struct sigframe. | |
453 | */ | |
81d103bf | 454 | regs->regs[ 4] = ksig->sig; |
1da177e4 LT |
455 | regs->regs[ 5] = 0; |
456 | regs->regs[ 6] = (unsigned long) &frame->sf_sc; | |
457 | regs->regs[29] = (unsigned long) frame; | |
d814c28c | 458 | regs->regs[31] = (unsigned long) sig_return; |
81d103bf | 459 | regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 | 460 | |
722bb63d | 461 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 | 462 | current->comm, current->pid, |
722bb63d | 463 | frame, regs->cp0_epc, regs->regs[31]); |
e0daad44 | 464 | return 0; |
1da177e4 LT |
465 | } |
466 | #endif | |
467 | ||
81d103bf RW |
468 | static int setup_rt_frame(void *sig_return, struct ksignal *ksig, |
469 | struct pt_regs *regs, sigset_t *set) | |
1da177e4 | 470 | { |
9bbf28a3 | 471 | struct rt_sigframe __user *frame; |
1da177e4 LT |
472 | int err = 0; |
473 | ||
7c4f5635 | 474 | frame = get_sigframe(ksig, regs, sizeof(*frame)); |
1da177e4 | 475 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) |
81d103bf | 476 | return -EFAULT; |
1da177e4 | 477 | |
1da177e4 | 478 | /* Create siginfo. */ |
81d103bf | 479 | err |= copy_siginfo_to_user(&frame->rs_info, &ksig->info); |
1da177e4 | 480 | |
70342287 | 481 | /* Create the ucontext. */ |
1da177e4 | 482 | err |= __put_user(0, &frame->rs_uc.uc_flags); |
5665a0ac | 483 | err |= __put_user(NULL, &frame->rs_uc.uc_link); |
ea536ad4 | 484 | err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]); |
1da177e4 LT |
485 | err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); |
486 | err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); | |
487 | ||
488 | if (err) | |
81d103bf | 489 | return -EFAULT; |
1da177e4 LT |
490 | |
491 | /* | |
492 | * Arguments to signal handler: | |
493 | * | |
494 | * a0 = signal number | |
495 | * a1 = 0 (should be cause) | |
496 | * a2 = pointer to ucontext | |
497 | * | |
498 | * $25 and c0_epc point to the signal handler, $29 points to | |
499 | * the struct rt_sigframe. | |
500 | */ | |
81d103bf | 501 | regs->regs[ 4] = ksig->sig; |
1da177e4 LT |
502 | regs->regs[ 5] = (unsigned long) &frame->rs_info; |
503 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
504 | regs->regs[29] = (unsigned long) frame; | |
d814c28c | 505 | regs->regs[31] = (unsigned long) sig_return; |
81d103bf | 506 | regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 | 507 | |
722bb63d | 508 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 LT |
509 | current->comm, current->pid, |
510 | frame, regs->cp0_epc, regs->regs[31]); | |
722bb63d | 511 | |
7b3e2fc8 | 512 | return 0; |
1da177e4 LT |
513 | } |
514 | ||
151fd6ac RB |
515 | struct mips_abi mips_abi = { |
516 | #ifdef CONFIG_TRAD_SIGNALS | |
517 | .setup_frame = setup_frame, | |
d814c28c | 518 | .signal_return_offset = offsetof(struct mips_vdso, signal_trampoline), |
151fd6ac | 519 | #endif |
70342287 | 520 | .setup_rt_frame = setup_rt_frame, |
d814c28c DD |
521 | .rt_signal_return_offset = |
522 | offsetof(struct mips_vdso, rt_signal_trampoline), | |
151fd6ac RB |
523 | .restart = __NR_restart_syscall |
524 | }; | |
525 | ||
81d103bf | 526 | static void handle_signal(struct ksignal *ksig, struct pt_regs *regs) |
1da177e4 | 527 | { |
b7f9a11a | 528 | sigset_t *oldset = sigmask_to_save(); |
129bc8f7 | 529 | int ret; |
d814c28c | 530 | struct mips_abi *abi = current->thread.abi; |
01be057b DL |
531 | #ifdef CONFIG_CPU_MICROMIPS |
532 | void *vdso; | |
2fabc7d2 | 533 | unsigned long tmp = (unsigned long)current->mm->context.vdso; |
01be057b DL |
534 | |
535 | set_isa16_mode(tmp); | |
536 | vdso = (void *)tmp; | |
537 | #else | |
d814c28c | 538 | void *vdso = current->mm->context.vdso; |
01be057b | 539 | #endif |
129bc8f7 | 540 | |
8f5a00eb AV |
541 | if (regs->regs[0]) { |
542 | switch(regs->regs[2]) { | |
543 | case ERESTART_RESTARTBLOCK: | |
544 | case ERESTARTNOHAND: | |
1da177e4 LT |
545 | regs->regs[2] = EINTR; |
546 | break; | |
8f5a00eb | 547 | case ERESTARTSYS: |
81d103bf | 548 | if (!(ksig->ka.sa.sa_flags & SA_RESTART)) { |
8f5a00eb AV |
549 | regs->regs[2] = EINTR; |
550 | break; | |
551 | } | |
552 | /* fallthrough */ | |
553 | case ERESTARTNOINTR: | |
554 | regs->regs[7] = regs->regs[26]; | |
555 | regs->regs[2] = regs->regs[0]; | |
556 | regs->cp0_epc -= 4; | |
1da177e4 | 557 | } |
1da177e4 | 558 | |
70342287 | 559 | regs->regs[0] = 0; /* Don't deal with this again. */ |
8f5a00eb | 560 | } |
1da177e4 | 561 | |
81d103bf | 562 | if (sig_uses_siginfo(&ksig->ka)) |
d814c28c | 563 | ret = abi->setup_rt_frame(vdso + abi->rt_signal_return_offset, |
81d103bf | 564 | ksig, regs, oldset); |
1da177e4 | 565 | else |
81d103bf RW |
566 | ret = abi->setup_frame(vdso + abi->signal_return_offset, ksig, |
567 | regs, oldset); | |
062ab57b | 568 | |
81d103bf | 569 | signal_setup_done(ret, ksig, 0); |
1da177e4 LT |
570 | } |
571 | ||
151fd6ac | 572 | static void do_signal(struct pt_regs *regs) |
1da177e4 | 573 | { |
81d103bf | 574 | struct ksignal ksig; |
1da177e4 | 575 | |
81d103bf | 576 | if (get_signal(&ksig)) { |
70342287 | 577 | /* Whee! Actually deliver the signal. */ |
81d103bf | 578 | handle_signal(&ksig, regs); |
45887e12 | 579 | return; |
7b3e2fc8 | 580 | } |
1da177e4 | 581 | |
1da177e4 | 582 | if (regs->regs[0]) { |
9ec9b5ac RB |
583 | switch (regs->regs[2]) { |
584 | case ERESTARTNOHAND: | |
585 | case ERESTARTSYS: | |
586 | case ERESTARTNOINTR: | |
8f5a00eb | 587 | regs->regs[2] = regs->regs[0]; |
1da177e4 | 588 | regs->regs[7] = regs->regs[26]; |
8f5a00eb | 589 | regs->cp0_epc -= 4; |
9ec9b5ac RB |
590 | break; |
591 | ||
592 | case ERESTART_RESTARTBLOCK: | |
151fd6ac | 593 | regs->regs[2] = current->thread.abi->restart; |
1da177e4 LT |
594 | regs->regs[7] = regs->regs[26]; |
595 | regs->cp0_epc -= 4; | |
9ec9b5ac | 596 | break; |
1da177e4 | 597 | } |
70342287 | 598 | regs->regs[0] = 0; /* Don't deal with this again. */ |
1da177e4 | 599 | } |
7b3e2fc8 RB |
600 | |
601 | /* | |
602 | * If there's no signal to deliver, we just put the saved sigmask | |
603 | * back | |
604 | */ | |
51a7b448 | 605 | restore_saved_sigmask(); |
1da177e4 LT |
606 | } |
607 | ||
608 | /* | |
609 | * notification of userspace execution resumption | |
7b3e2fc8 | 610 | * - triggered by the TIF_WORK_MASK flags |
1da177e4 | 611 | */ |
7b3e2fc8 | 612 | asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, |
1da177e4 LT |
613 | __u32 thread_info_flags) |
614 | { | |
1f717929 RB |
615 | local_irq_enable(); |
616 | ||
c3fc5cd5 RB |
617 | user_exit(); |
618 | ||
1da177e4 | 619 | /* deal with pending signal delivery */ |
6fd84c08 | 620 | if (thread_info_flags & _TIF_SIGPENDING) |
151fd6ac | 621 | do_signal(regs); |
d0420c83 DH |
622 | |
623 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { | |
624 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
625 | tracehook_notify_resume(regs); | |
626 | } | |
c3fc5cd5 RB |
627 | |
628 | user_enter(); | |
1da177e4 | 629 | } |
137f6f3e RB |
630 | |
631 | #ifdef CONFIG_SMP | |
ca750649 | 632 | #ifndef CONFIG_EVA |
137f6f3e RB |
633 | static int smp_save_fp_context(struct sigcontext __user *sc) |
634 | { | |
635 | return raw_cpu_has_fpu | |
636 | ? _save_fp_context(sc) | |
b2ead528 | 637 | : copy_fp_to_sigcontext(sc); |
137f6f3e RB |
638 | } |
639 | ||
640 | static int smp_restore_fp_context(struct sigcontext __user *sc) | |
641 | { | |
642 | return raw_cpu_has_fpu | |
643 | ? _restore_fp_context(sc) | |
b2ead528 | 644 | : copy_fp_from_sigcontext(sc); |
137f6f3e | 645 | } |
ca750649 | 646 | #endif /* CONFIG_EVA */ |
137f6f3e RB |
647 | #endif |
648 | ||
649 | static int signal_setup(void) | |
650 | { | |
ca750649 | 651 | #ifndef CONFIG_EVA |
137f6f3e RB |
652 | #ifdef CONFIG_SMP |
653 | /* For now just do the cpu_has_fpu check when the functions are invoked */ | |
654 | save_fp_context = smp_save_fp_context; | |
655 | restore_fp_context = smp_restore_fp_context; | |
656 | #else | |
657 | if (cpu_has_fpu) { | |
658 | save_fp_context = _save_fp_context; | |
659 | restore_fp_context = _restore_fp_context; | |
660 | } else { | |
14fa12df PB |
661 | save_fp_context = copy_fp_to_sigcontext; |
662 | restore_fp_context = copy_fp_from_sigcontext; | |
137f6f3e | 663 | } |
ca750649 LY |
664 | #endif /* CONFIG_SMP */ |
665 | #else | |
14fa12df PB |
666 | save_fp_context = copy_fp_to_sigcontext; |
667 | restore_fp_context = copy_fp_from_sigcontext; | |
137f6f3e RB |
668 | #endif |
669 | ||
670 | return 0; | |
671 | } | |
672 | ||
673 | arch_initcall(signal_setup); |