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> |
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> | |
eec43a22 | 33 | #include <asm/msa.h> |
1da177e4 | 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 | ||
eec43a22 PB |
50 | extern asmlinkage int _save_msa_context(struct sigcontext __user *sc); |
51 | extern asmlinkage int _restore_msa_context(struct sigcontext __user *sc); | |
52 | ||
66680583 RB |
53 | struct sigframe { |
54 | u32 sf_ass[4]; /* argument save space for o32 */ | |
d814c28c | 55 | u32 sf_pad[2]; /* Was: signal trampoline */ |
66680583 RB |
56 | struct sigcontext sf_sc; |
57 | sigset_t sf_mask; | |
58 | }; | |
59 | ||
c0b9bae9 FBH |
60 | struct rt_sigframe { |
61 | u32 rs_ass[4]; /* argument save space for o32 */ | |
d814c28c | 62 | u32 rs_pad[2]; /* Was: signal trampoline */ |
c0b9bae9 FBH |
63 | struct siginfo rs_info; |
64 | struct ucontext rs_uc; | |
65 | }; | |
66 | ||
b2ead528 PB |
67 | /* |
68 | * Thread saved context copy to/from a signal context presumed to be on the | |
69 | * user stack, and therefore accessed with appropriate macros from uaccess.h. | |
70 | */ | |
71 | static int copy_fp_to_sigcontext(struct sigcontext __user *sc) | |
72 | { | |
73 | int i; | |
74 | int err = 0; | |
75 | ||
6bbfd65e | 76 | for (i = 0; i < NUM_FPU_REGS; i++) { |
b2ead528 PB |
77 | err |= |
78 | __put_user(get_fpr64(¤t->thread.fpu.fpr[i], 0), | |
79 | &sc->sc_fpregs[i]); | |
80 | } | |
81 | err |= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr); | |
82 | ||
83 | return err; | |
84 | } | |
85 | ||
86 | static int copy_fp_from_sigcontext(struct sigcontext __user *sc) | |
87 | { | |
88 | int i; | |
89 | int err = 0; | |
90 | u64 fpr_val; | |
91 | ||
6bbfd65e | 92 | for (i = 0; i < NUM_FPU_REGS; i++) { |
b2ead528 PB |
93 | err |= __get_user(fpr_val, &sc->sc_fpregs[i]); |
94 | set_fpr64(¤t->thread.fpu.fpr[i], 0, fpr_val); | |
95 | } | |
96 | err |= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr); | |
97 | ||
98 | return err; | |
99 | } | |
100 | ||
eec43a22 PB |
101 | /* |
102 | * These functions will save only the upper 64 bits of the vector registers, | |
103 | * since the lower 64 bits have already been saved as the scalar FP context. | |
104 | */ | |
105 | static int copy_msa_to_sigcontext(struct sigcontext __user *sc) | |
106 | { | |
107 | int i; | |
108 | int err = 0; | |
109 | ||
110 | for (i = 0; i < NUM_FPU_REGS; i++) { | |
111 | err |= | |
112 | __put_user(get_fpr64(¤t->thread.fpu.fpr[i], 1), | |
113 | &sc->sc_msaregs[i]); | |
114 | } | |
115 | err |= __put_user(current->thread.fpu.msacsr, &sc->sc_msa_csr); | |
116 | ||
117 | return err; | |
118 | } | |
119 | ||
120 | static int copy_msa_from_sigcontext(struct sigcontext __user *sc) | |
121 | { | |
122 | int i; | |
123 | int err = 0; | |
124 | u64 val; | |
125 | ||
126 | for (i = 0; i < NUM_FPU_REGS; i++) { | |
127 | err |= __get_user(val, &sc->sc_msaregs[i]); | |
128 | set_fpr64(¤t->thread.fpu.fpr[i], 1, val); | |
129 | } | |
130 | err |= __get_user(current->thread.fpu.msacsr, &sc->sc_msa_csr); | |
131 | ||
132 | return err; | |
133 | } | |
134 | ||
c3fc4ab3 FBH |
135 | /* |
136 | * Helper routines | |
137 | */ | |
eec43a22 PB |
138 | static int protected_save_fp_context(struct sigcontext __user *sc, |
139 | unsigned used_math) | |
faea6234 AN |
140 | { |
141 | int err; | |
eec43a22 | 142 | bool save_msa = cpu_has_msa && (used_math & USEDMATH_MSA); |
faea6234 AN |
143 | while (1) { |
144 | lock_fpu_owner(); | |
ff3aa5f2 PB |
145 | if (is_fpu_owner()) { |
146 | err = save_fp_context(sc); | |
eec43a22 PB |
147 | if (save_msa && !err) |
148 | err = _save_msa_context(sc); | |
ff3aa5f2 PB |
149 | unlock_fpu_owner(); |
150 | } else { | |
151 | unlock_fpu_owner(); | |
152 | err = copy_fp_to_sigcontext(sc); | |
eec43a22 PB |
153 | if (save_msa && !err) |
154 | err = copy_msa_to_sigcontext(sc); | |
ff3aa5f2 | 155 | } |
faea6234 AN |
156 | if (likely(!err)) |
157 | break; | |
158 | /* touch the sigcontext and try again */ | |
159 | err = __put_user(0, &sc->sc_fpregs[0]) | | |
160 | __put_user(0, &sc->sc_fpregs[31]) | | |
161 | __put_user(0, &sc->sc_fpc_csr); | |
162 | if (err) | |
163 | break; /* really bad sigcontext */ | |
164 | } | |
165 | return err; | |
166 | } | |
167 | ||
eec43a22 PB |
168 | static int protected_restore_fp_context(struct sigcontext __user *sc, |
169 | unsigned used_math) | |
faea6234 | 170 | { |
c726b822 | 171 | int err, tmp __maybe_unused; |
eec43a22 | 172 | bool restore_msa = cpu_has_msa && (used_math & USEDMATH_MSA); |
faea6234 AN |
173 | while (1) { |
174 | lock_fpu_owner(); | |
ff3aa5f2 PB |
175 | if (is_fpu_owner()) { |
176 | err = restore_fp_context(sc); | |
eec43a22 PB |
177 | if (restore_msa && !err) { |
178 | enable_msa(); | |
179 | err = _restore_msa_context(sc); | |
180 | } else { | |
181 | /* signal handler may have used MSA */ | |
182 | disable_msa(); | |
183 | } | |
ff3aa5f2 PB |
184 | unlock_fpu_owner(); |
185 | } else { | |
186 | unlock_fpu_owner(); | |
187 | err = copy_fp_from_sigcontext(sc); | |
eec43a22 PB |
188 | if (!err && (used_math & USEDMATH_MSA)) |
189 | err = copy_msa_from_sigcontext(sc); | |
ff3aa5f2 | 190 | } |
faea6234 AN |
191 | if (likely(!err)) |
192 | break; | |
193 | /* touch the sigcontext and try again */ | |
194 | err = __get_user(tmp, &sc->sc_fpregs[0]) | | |
195 | __get_user(tmp, &sc->sc_fpregs[31]) | | |
196 | __get_user(tmp, &sc->sc_fpc_csr); | |
197 | if (err) | |
198 | break; /* really bad sigcontext */ | |
199 | } | |
200 | return err; | |
201 | } | |
202 | ||
c3fc4ab3 FBH |
203 | int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
204 | { | |
205 | int err = 0; | |
206 | int i; | |
53dc8028 | 207 | unsigned int used_math; |
c3fc4ab3 FBH |
208 | |
209 | err |= __put_user(regs->cp0_epc, &sc->sc_pc); | |
210 | ||
211 | err |= __put_user(0, &sc->sc_regs[0]); | |
212 | for (i = 1; i < 32; i++) | |
213 | err |= __put_user(regs->regs[i], &sc->sc_regs[i]); | |
214 | ||
9693a853 FBH |
215 | #ifdef CONFIG_CPU_HAS_SMARTMIPS |
216 | err |= __put_user(regs->acx, &sc->sc_acx); | |
217 | #endif | |
c3fc4ab3 FBH |
218 | err |= __put_user(regs->hi, &sc->sc_mdhi); |
219 | err |= __put_user(regs->lo, &sc->sc_mdlo); | |
220 | if (cpu_has_dsp) { | |
221 | err |= __put_user(mfhi1(), &sc->sc_hi1); | |
222 | err |= __put_user(mflo1(), &sc->sc_lo1); | |
223 | err |= __put_user(mfhi2(), &sc->sc_hi2); | |
224 | err |= __put_user(mflo2(), &sc->sc_lo2); | |
225 | err |= __put_user(mfhi3(), &sc->sc_hi3); | |
226 | err |= __put_user(mflo3(), &sc->sc_lo3); | |
227 | err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); | |
228 | } | |
229 | ||
eec43a22 PB |
230 | used_math = used_math() ? USEDMATH_FP : 0; |
231 | used_math |= thread_msa_context_live() ? USEDMATH_MSA : 0; | |
53dc8028 | 232 | err |= __put_user(used_math, &sc->sc_used_math); |
c3fc4ab3 | 233 | |
53dc8028 | 234 | if (used_math) { |
c3fc4ab3 FBH |
235 | /* |
236 | * Save FPU state to signal context. Signal handler | |
237 | * will "inherit" current FPU state. | |
238 | */ | |
eec43a22 | 239 | err |= protected_save_fp_context(sc, used_math); |
c3fc4ab3 FBH |
240 | } |
241 | return err; | |
242 | } | |
243 | ||
c6a2f467 AN |
244 | int fpcsr_pending(unsigned int __user *fpcsr) |
245 | { | |
246 | int err, sig = 0; | |
247 | unsigned int csr, enabled; | |
248 | ||
249 | err = __get_user(csr, fpcsr); | |
250 | enabled = FPU_CSR_UNI_X | ((csr & FPU_CSR_ALL_E) << 5); | |
251 | /* | |
252 | * If the signal handler set some FPU exceptions, clear it and | |
253 | * send SIGFPE. | |
254 | */ | |
255 | if (csr & enabled) { | |
256 | csr &= ~enabled; | |
257 | err |= __put_user(csr, fpcsr); | |
258 | sig = SIGFPE; | |
259 | } | |
260 | return err ?: sig; | |
261 | } | |
262 | ||
263 | static int | |
eec43a22 | 264 | check_and_restore_fp_context(struct sigcontext __user *sc, unsigned used_math) |
c6a2f467 AN |
265 | { |
266 | int err, sig; | |
267 | ||
268 | err = sig = fpcsr_pending(&sc->sc_fpc_csr); | |
269 | if (err > 0) | |
270 | err = 0; | |
eec43a22 | 271 | err |= protected_restore_fp_context(sc, used_math); |
c6a2f467 AN |
272 | return err ?: sig; |
273 | } | |
274 | ||
c3fc4ab3 FBH |
275 | int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
276 | { | |
277 | unsigned int used_math; | |
278 | unsigned long treg; | |
279 | int err = 0; | |
280 | int i; | |
281 | ||
282 | /* Always make any pending restarted system calls return -EINTR */ | |
283 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
284 | ||
285 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); | |
9693a853 FBH |
286 | |
287 | #ifdef CONFIG_CPU_HAS_SMARTMIPS | |
288 | err |= __get_user(regs->acx, &sc->sc_acx); | |
289 | #endif | |
c3fc4ab3 FBH |
290 | err |= __get_user(regs->hi, &sc->sc_mdhi); |
291 | err |= __get_user(regs->lo, &sc->sc_mdlo); | |
292 | if (cpu_has_dsp) { | |
293 | err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); | |
294 | err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); | |
295 | err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); | |
296 | err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); | |
297 | err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); | |
298 | err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); | |
299 | err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); | |
300 | } | |
301 | ||
302 | for (i = 1; i < 32; i++) | |
303 | err |= __get_user(regs->regs[i], &sc->sc_regs[i]); | |
304 | ||
305 | err |= __get_user(used_math, &sc->sc_used_math); | |
306 | conditional_used_math(used_math); | |
307 | ||
53dc8028 | 308 | if (used_math) { |
c3fc4ab3 | 309 | /* restore fpu context if we have used it before */ |
c6a2f467 | 310 | if (!err) |
eec43a22 | 311 | err = check_and_restore_fp_context(sc, used_math); |
c3fc4ab3 | 312 | } else { |
eec43a22 PB |
313 | /* signal handler may have used FPU or MSA. Disable them. */ |
314 | disable_msa(); | |
53dc8028 | 315 | lose_fpu(0); |
c3fc4ab3 FBH |
316 | } |
317 | ||
c3fc4ab3 FBH |
318 | return err; |
319 | } | |
320 | ||
321 | void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, | |
322 | size_t frame_size) | |
323 | { | |
324 | unsigned long sp; | |
325 | ||
326 | /* Default to using normal stack */ | |
327 | sp = regs->regs[29]; | |
328 | ||
329 | /* | |
330 | * FPU emulator may have it's own trampoline active just | |
331 | * above the user stack, 16-bytes before the next lowest | |
332 | * 16 byte boundary. Try to avoid trashing it. | |
333 | */ | |
334 | sp -= 32; | |
335 | ||
336 | /* This is the X/Open sanctioned signal stack switching. */ | |
337 | if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0)) | |
338 | sp = current->sas_ss_sp + current->sas_ss_size; | |
339 | ||
340 | return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK)); | |
341 | } | |
342 | ||
1da177e4 LT |
343 | /* |
344 | * Atomically swap in the new signal mask, and wait for a signal. | |
345 | */ | |
346 | ||
347 | #ifdef CONFIG_TRAD_SIGNALS | |
1910f4ab | 348 | SYSCALL_DEFINE1(sigsuspend, sigset_t __user *, uset) |
1da177e4 | 349 | { |
1910f4ab | 350 | return sys_rt_sigsuspend(uset, sizeof(sigset_t)); |
1da177e4 LT |
351 | } |
352 | #endif | |
353 | ||
1da177e4 | 354 | #ifdef CONFIG_TRAD_SIGNALS |
dbda6ac0 RB |
355 | SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act, |
356 | struct sigaction __user *, oact) | |
1da177e4 LT |
357 | { |
358 | struct k_sigaction new_ka, old_ka; | |
359 | int ret; | |
360 | int err = 0; | |
361 | ||
362 | if (act) { | |
363 | old_sigset_t mask; | |
364 | ||
365 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
366 | return -EFAULT; | |
367 | err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler); | |
368 | err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
369 | err |= __get_user(mask, &act->sa_mask.sig[0]); | |
370 | if (err) | |
371 | return -EFAULT; | |
372 | ||
373 | siginitset(&new_ka.sa.sa_mask, mask); | |
374 | } | |
375 | ||
376 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
377 | ||
378 | if (!ret && oact) { | |
379 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
e0daad44 | 380 | return -EFAULT; |
1da177e4 LT |
381 | err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
382 | err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler); | |
383 | err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); | |
384 | err |= __put_user(0, &oact->sa_mask.sig[1]); | |
385 | err |= __put_user(0, &oact->sa_mask.sig[2]); | |
386 | err |= __put_user(0, &oact->sa_mask.sig[3]); | |
387 | if (err) | |
388 | return -EFAULT; | |
389 | } | |
390 | ||
391 | return ret; | |
392 | } | |
393 | #endif | |
394 | ||
1da177e4 | 395 | #ifdef CONFIG_TRAD_SIGNALS |
f90080a0 | 396 | asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 397 | { |
9bbf28a3 | 398 | struct sigframe __user *frame; |
1da177e4 | 399 | sigset_t blocked; |
c6a2f467 | 400 | int sig; |
1da177e4 | 401 | |
9bbf28a3 | 402 | frame = (struct sigframe __user *) regs.regs[29]; |
1da177e4 LT |
403 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
404 | goto badframe; | |
405 | if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked))) | |
406 | goto badframe; | |
407 | ||
8598f3cd | 408 | set_current_blocked(&blocked); |
1da177e4 | 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 | 434 | sigset_t set; |
c6a2f467 | 435 | int sig; |
1da177e4 | 436 | |
9bbf28a3 | 437 | frame = (struct rt_sigframe __user *) regs.regs[29]; |
1da177e4 LT |
438 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
439 | goto badframe; | |
440 | if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) | |
441 | goto badframe; | |
442 | ||
8598f3cd | 443 | set_current_blocked(&set); |
1da177e4 | 444 | |
c6a2f467 AN |
445 | sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext); |
446 | if (sig < 0) | |
1da177e4 | 447 | goto badframe; |
c6a2f467 AN |
448 | else if (sig) |
449 | force_sig(sig, current); | |
1da177e4 | 450 | |
ea536ad4 AV |
451 | if (restore_altstack(&frame->rs_uc.uc_stack)) |
452 | goto badframe; | |
1da177e4 LT |
453 | |
454 | /* | |
455 | * Don't let your children do this ... | |
456 | */ | |
457 | __asm__ __volatile__( | |
458 | "move\t$29, %0\n\t" | |
459 | "j\tsyscall_exit" | |
460 | :/* no outputs */ | |
461 | :"r" (®s)); | |
462 | /* Unreached */ | |
463 | ||
464 | badframe: | |
465 | force_sig(SIGSEGV, current); | |
466 | } | |
467 | ||
468 | #ifdef CONFIG_TRAD_SIGNALS | |
d814c28c DD |
469 | static int setup_frame(void *sig_return, struct k_sigaction *ka, |
470 | struct pt_regs *regs, int signr, sigset_t *set) | |
1da177e4 | 471 | { |
9bbf28a3 | 472 | struct sigframe __user *frame; |
1da177e4 LT |
473 | int err = 0; |
474 | ||
475 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
476 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
477 | goto give_sigsegv; | |
478 | ||
1da177e4 LT |
479 | err |= setup_sigcontext(regs, &frame->sf_sc); |
480 | err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set)); | |
481 | if (err) | |
482 | goto give_sigsegv; | |
483 | ||
484 | /* | |
485 | * Arguments to signal handler: | |
486 | * | |
487 | * a0 = signal number | |
488 | * a1 = 0 (should be cause) | |
489 | * a2 = pointer to struct sigcontext | |
490 | * | |
491 | * $25 and c0_epc point to the signal handler, $29 points to the | |
492 | * struct sigframe. | |
493 | */ | |
494 | regs->regs[ 4] = signr; | |
495 | regs->regs[ 5] = 0; | |
496 | regs->regs[ 6] = (unsigned long) &frame->sf_sc; | |
497 | regs->regs[29] = (unsigned long) frame; | |
d814c28c | 498 | regs->regs[31] = (unsigned long) sig_return; |
1da177e4 LT |
499 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; |
500 | ||
722bb63d | 501 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 | 502 | current->comm, current->pid, |
722bb63d | 503 | frame, regs->cp0_epc, regs->regs[31]); |
e0daad44 | 504 | return 0; |
1da177e4 LT |
505 | |
506 | give_sigsegv: | |
507 | force_sigsegv(signr, current); | |
7b3e2fc8 | 508 | return -EFAULT; |
1da177e4 LT |
509 | } |
510 | #endif | |
511 | ||
d814c28c | 512 | static int setup_rt_frame(void *sig_return, struct k_sigaction *ka, |
70342287 | 513 | struct pt_regs *regs, int signr, sigset_t *set, |
d814c28c | 514 | siginfo_t *info) |
1da177e4 | 515 | { |
9bbf28a3 | 516 | struct rt_sigframe __user *frame; |
1da177e4 LT |
517 | int err = 0; |
518 | ||
519 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
520 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
521 | goto give_sigsegv; | |
522 | ||
1da177e4 LT |
523 | /* Create siginfo. */ |
524 | err |= copy_siginfo_to_user(&frame->rs_info, info); | |
525 | ||
70342287 | 526 | /* Create the ucontext. */ |
1da177e4 | 527 | err |= __put_user(0, &frame->rs_uc.uc_flags); |
5665a0ac | 528 | err |= __put_user(NULL, &frame->rs_uc.uc_link); |
ea536ad4 | 529 | err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]); |
1da177e4 LT |
530 | err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); |
531 | err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); | |
532 | ||
533 | if (err) | |
534 | goto give_sigsegv; | |
535 | ||
536 | /* | |
537 | * Arguments to signal handler: | |
538 | * | |
539 | * a0 = signal number | |
540 | * a1 = 0 (should be cause) | |
541 | * a2 = pointer to ucontext | |
542 | * | |
543 | * $25 and c0_epc point to the signal handler, $29 points to | |
544 | * the struct rt_sigframe. | |
545 | */ | |
546 | regs->regs[ 4] = signr; | |
547 | regs->regs[ 5] = (unsigned long) &frame->rs_info; | |
548 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
549 | regs->regs[29] = (unsigned long) frame; | |
d814c28c | 550 | regs->regs[31] = (unsigned long) sig_return; |
1da177e4 LT |
551 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; |
552 | ||
722bb63d | 553 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 LT |
554 | current->comm, current->pid, |
555 | frame, regs->cp0_epc, regs->regs[31]); | |
722bb63d | 556 | |
7b3e2fc8 | 557 | return 0; |
1da177e4 LT |
558 | |
559 | give_sigsegv: | |
560 | force_sigsegv(signr, current); | |
7b3e2fc8 | 561 | return -EFAULT; |
1da177e4 LT |
562 | } |
563 | ||
151fd6ac RB |
564 | struct mips_abi mips_abi = { |
565 | #ifdef CONFIG_TRAD_SIGNALS | |
566 | .setup_frame = setup_frame, | |
d814c28c | 567 | .signal_return_offset = offsetof(struct mips_vdso, signal_trampoline), |
151fd6ac | 568 | #endif |
70342287 | 569 | .setup_rt_frame = setup_rt_frame, |
d814c28c DD |
570 | .rt_signal_return_offset = |
571 | offsetof(struct mips_vdso, rt_signal_trampoline), | |
151fd6ac RB |
572 | .restart = __NR_restart_syscall |
573 | }; | |
574 | ||
a610d6e6 | 575 | static void handle_signal(unsigned long sig, siginfo_t *info, |
b7f9a11a | 576 | struct k_sigaction *ka, struct pt_regs *regs) |
1da177e4 | 577 | { |
b7f9a11a | 578 | sigset_t *oldset = sigmask_to_save(); |
129bc8f7 | 579 | int ret; |
d814c28c | 580 | struct mips_abi *abi = current->thread.abi; |
01be057b DL |
581 | #ifdef CONFIG_CPU_MICROMIPS |
582 | void *vdso; | |
583 | unsigned int tmp = (unsigned int)current->mm->context.vdso; | |
584 | ||
585 | set_isa16_mode(tmp); | |
586 | vdso = (void *)tmp; | |
587 | #else | |
d814c28c | 588 | void *vdso = current->mm->context.vdso; |
01be057b | 589 | #endif |
129bc8f7 | 590 | |
8f5a00eb AV |
591 | if (regs->regs[0]) { |
592 | switch(regs->regs[2]) { | |
593 | case ERESTART_RESTARTBLOCK: | |
594 | case ERESTARTNOHAND: | |
1da177e4 LT |
595 | regs->regs[2] = EINTR; |
596 | break; | |
8f5a00eb AV |
597 | case ERESTARTSYS: |
598 | if (!(ka->sa.sa_flags & SA_RESTART)) { | |
599 | regs->regs[2] = EINTR; | |
600 | break; | |
601 | } | |
602 | /* fallthrough */ | |
603 | case ERESTARTNOINTR: | |
604 | regs->regs[7] = regs->regs[26]; | |
605 | regs->regs[2] = regs->regs[0]; | |
606 | regs->cp0_epc -= 4; | |
1da177e4 | 607 | } |
1da177e4 | 608 | |
70342287 | 609 | regs->regs[0] = 0; /* Don't deal with this again. */ |
8f5a00eb | 610 | } |
1da177e4 | 611 | |
e50c0a8f | 612 | if (sig_uses_siginfo(ka)) |
d814c28c DD |
613 | ret = abi->setup_rt_frame(vdso + abi->rt_signal_return_offset, |
614 | ka, regs, sig, oldset, info); | |
1da177e4 | 615 | else |
d814c28c DD |
616 | ret = abi->setup_frame(vdso + abi->signal_return_offset, |
617 | ka, regs, sig, oldset); | |
1da177e4 | 618 | |
062ab57b | 619 | if (ret) |
a610d6e6 | 620 | return; |
062ab57b | 621 | |
efee984c | 622 | signal_delivered(sig, info, ka, regs, 0); |
1da177e4 LT |
623 | } |
624 | ||
151fd6ac | 625 | static void do_signal(struct pt_regs *regs) |
1da177e4 LT |
626 | { |
627 | struct k_sigaction ka; | |
628 | siginfo_t info; | |
629 | int signr; | |
630 | ||
1da177e4 | 631 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
7b3e2fc8 | 632 | if (signr > 0) { |
70342287 | 633 | /* Whee! Actually deliver the signal. */ |
a610d6e6 | 634 | handle_signal(signr, &info, &ka, regs); |
45887e12 | 635 | return; |
7b3e2fc8 | 636 | } |
1da177e4 | 637 | |
1da177e4 | 638 | if (regs->regs[0]) { |
9ec9b5ac RB |
639 | switch (regs->regs[2]) { |
640 | case ERESTARTNOHAND: | |
641 | case ERESTARTSYS: | |
642 | case ERESTARTNOINTR: | |
8f5a00eb | 643 | regs->regs[2] = regs->regs[0]; |
1da177e4 | 644 | regs->regs[7] = regs->regs[26]; |
8f5a00eb | 645 | regs->cp0_epc -= 4; |
9ec9b5ac RB |
646 | break; |
647 | ||
648 | case ERESTART_RESTARTBLOCK: | |
151fd6ac | 649 | regs->regs[2] = current->thread.abi->restart; |
1da177e4 LT |
650 | regs->regs[7] = regs->regs[26]; |
651 | regs->cp0_epc -= 4; | |
9ec9b5ac | 652 | break; |
1da177e4 | 653 | } |
70342287 | 654 | regs->regs[0] = 0; /* Don't deal with this again. */ |
1da177e4 | 655 | } |
7b3e2fc8 RB |
656 | |
657 | /* | |
658 | * If there's no signal to deliver, we just put the saved sigmask | |
659 | * back | |
660 | */ | |
51a7b448 | 661 | restore_saved_sigmask(); |
1da177e4 LT |
662 | } |
663 | ||
664 | /* | |
665 | * notification of userspace execution resumption | |
7b3e2fc8 | 666 | * - triggered by the TIF_WORK_MASK flags |
1da177e4 | 667 | */ |
7b3e2fc8 | 668 | asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, |
1da177e4 LT |
669 | __u32 thread_info_flags) |
670 | { | |
1f717929 RB |
671 | local_irq_enable(); |
672 | ||
c3fc5cd5 RB |
673 | user_exit(); |
674 | ||
1da177e4 | 675 | /* deal with pending signal delivery */ |
6fd84c08 | 676 | if (thread_info_flags & _TIF_SIGPENDING) |
151fd6ac | 677 | do_signal(regs); |
d0420c83 DH |
678 | |
679 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { | |
680 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
681 | tracehook_notify_resume(regs); | |
682 | } | |
c3fc5cd5 RB |
683 | |
684 | user_enter(); | |
1da177e4 | 685 | } |
137f6f3e RB |
686 | |
687 | #ifdef CONFIG_SMP | |
688 | static int smp_save_fp_context(struct sigcontext __user *sc) | |
689 | { | |
690 | return raw_cpu_has_fpu | |
691 | ? _save_fp_context(sc) | |
b2ead528 | 692 | : copy_fp_to_sigcontext(sc); |
137f6f3e RB |
693 | } |
694 | ||
695 | static int smp_restore_fp_context(struct sigcontext __user *sc) | |
696 | { | |
697 | return raw_cpu_has_fpu | |
698 | ? _restore_fp_context(sc) | |
b2ead528 | 699 | : copy_fp_from_sigcontext(sc); |
137f6f3e RB |
700 | } |
701 | #endif | |
702 | ||
703 | static int signal_setup(void) | |
704 | { | |
705 | #ifdef CONFIG_SMP | |
706 | /* For now just do the cpu_has_fpu check when the functions are invoked */ | |
707 | save_fp_context = smp_save_fp_context; | |
708 | restore_fp_context = smp_restore_fp_context; | |
709 | #else | |
710 | if (cpu_has_fpu) { | |
711 | save_fp_context = _save_fp_context; | |
712 | restore_fp_context = _restore_fp_context; | |
713 | } else { | |
b2ead528 PB |
714 | save_fp_context = copy_fp_from_sigcontext; |
715 | restore_fp_context = copy_fp_to_sigcontext; | |
137f6f3e RB |
716 | } |
717 | #endif | |
718 | ||
719 | return 0; | |
720 | } | |
721 | ||
722 | arch_initcall(signal_setup); |