Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 1991, 1992 Linus Torvalds | |
7 | * Copyright (C) 1994 - 2000 Ralf Baechle | |
8 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. | |
9 | */ | |
02416dcf | 10 | #include <linux/cache.h> |
1da177e4 LT |
11 | #include <linux/sched.h> |
12 | #include <linux/mm.h> | |
13 | #include <linux/personality.h> | |
14 | #include <linux/smp.h> | |
1da177e4 LT |
15 | #include <linux/kernel.h> |
16 | #include <linux/signal.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/wait.h> | |
19 | #include <linux/ptrace.h> | |
20 | #include <linux/unistd.h> | |
21 | #include <linux/compiler.h> | |
dbda6ac0 | 22 | #include <linux/syscalls.h> |
faea6234 | 23 | #include <linux/uaccess.h> |
733e5e4b | 24 | #include <linux/tracehook.h> |
1da177e4 | 25 | |
e50c0a8f | 26 | #include <asm/abi.h> |
1da177e4 LT |
27 | #include <asm/asm.h> |
28 | #include <linux/bitops.h> | |
29 | #include <asm/cacheflush.h> | |
30 | #include <asm/fpu.h> | |
31 | #include <asm/sim.h> | |
1da177e4 LT |
32 | #include <asm/ucontext.h> |
33 | #include <asm/cpu-features.h> | |
02416dcf | 34 | #include <asm/war.h> |
1da177e4 LT |
35 | |
36 | #include "signal-common.h" | |
37 | ||
137f6f3e RB |
38 | static int (*save_fp_context)(struct sigcontext __user *sc); |
39 | static int (*restore_fp_context)(struct sigcontext __user *sc); | |
40 | ||
41 | extern asmlinkage int _save_fp_context(struct sigcontext __user *sc); | |
42 | extern asmlinkage int _restore_fp_context(struct sigcontext __user *sc); | |
43 | ||
44 | extern asmlinkage int fpu_emulator_save_context(struct sigcontext __user *sc); | |
45 | extern asmlinkage int fpu_emulator_restore_context(struct sigcontext __user *sc); | |
46 | ||
66680583 RB |
47 | /* |
48 | * Horribly complicated - with the bloody RM9000 workarounds enabled | |
49 | * the signal trampolines is moving to the end of the structure so we can | |
50 | * increase the alignment without breaking software compatibility. | |
51 | */ | |
c0b9bae9 FBH |
52 | #if ICACHE_REFILLS_WORKAROUND_WAR == 0 |
53 | ||
66680583 RB |
54 | struct sigframe { |
55 | u32 sf_ass[4]; /* argument save space for o32 */ | |
56 | u32 sf_code[2]; /* signal trampoline */ | |
57 | struct sigcontext sf_sc; | |
58 | sigset_t sf_mask; | |
59 | }; | |
60 | ||
c0b9bae9 FBH |
61 | struct rt_sigframe { |
62 | u32 rs_ass[4]; /* argument save space for o32 */ | |
63 | u32 rs_code[2]; /* signal trampoline */ | |
64 | struct siginfo rs_info; | |
65 | struct ucontext rs_uc; | |
66 | }; | |
67 | ||
68 | #else | |
69 | ||
66680583 RB |
70 | struct sigframe { |
71 | u32 sf_ass[4]; /* argument save space for o32 */ | |
72 | u32 sf_pad[2]; | |
73 | struct sigcontext sf_sc; /* hw context */ | |
74 | sigset_t sf_mask; | |
75 | u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */ | |
76 | }; | |
77 | ||
c0b9bae9 FBH |
78 | struct rt_sigframe { |
79 | u32 rs_ass[4]; /* argument save space for o32 */ | |
80 | u32 rs_pad[2]; | |
81 | struct siginfo rs_info; | |
82 | struct ucontext rs_uc; | |
83 | u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */ | |
84 | }; | |
85 | ||
86 | #endif | |
87 | ||
c3fc4ab3 FBH |
88 | /* |
89 | * Helper routines | |
90 | */ | |
faea6234 AN |
91 | static int protected_save_fp_context(struct sigcontext __user *sc) |
92 | { | |
93 | int err; | |
94 | while (1) { | |
95 | lock_fpu_owner(); | |
96 | own_fpu_inatomic(1); | |
97 | err = save_fp_context(sc); /* this might fail */ | |
98 | unlock_fpu_owner(); | |
99 | if (likely(!err)) | |
100 | break; | |
101 | /* touch the sigcontext and try again */ | |
102 | err = __put_user(0, &sc->sc_fpregs[0]) | | |
103 | __put_user(0, &sc->sc_fpregs[31]) | | |
104 | __put_user(0, &sc->sc_fpc_csr); | |
105 | if (err) | |
106 | break; /* really bad sigcontext */ | |
107 | } | |
108 | return err; | |
109 | } | |
110 | ||
111 | static int protected_restore_fp_context(struct sigcontext __user *sc) | |
112 | { | |
113 | int err, tmp; | |
114 | while (1) { | |
115 | lock_fpu_owner(); | |
116 | own_fpu_inatomic(0); | |
117 | err = restore_fp_context(sc); /* this might fail */ | |
118 | unlock_fpu_owner(); | |
119 | if (likely(!err)) | |
120 | break; | |
121 | /* touch the sigcontext and try again */ | |
122 | err = __get_user(tmp, &sc->sc_fpregs[0]) | | |
123 | __get_user(tmp, &sc->sc_fpregs[31]) | | |
124 | __get_user(tmp, &sc->sc_fpc_csr); | |
125 | if (err) | |
126 | break; /* really bad sigcontext */ | |
127 | } | |
128 | return err; | |
129 | } | |
130 | ||
c3fc4ab3 FBH |
131 | int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
132 | { | |
133 | int err = 0; | |
134 | int i; | |
53dc8028 | 135 | unsigned int used_math; |
c3fc4ab3 FBH |
136 | |
137 | err |= __put_user(regs->cp0_epc, &sc->sc_pc); | |
138 | ||
139 | err |= __put_user(0, &sc->sc_regs[0]); | |
140 | for (i = 1; i < 32; i++) | |
141 | err |= __put_user(regs->regs[i], &sc->sc_regs[i]); | |
142 | ||
9693a853 FBH |
143 | #ifdef CONFIG_CPU_HAS_SMARTMIPS |
144 | err |= __put_user(regs->acx, &sc->sc_acx); | |
145 | #endif | |
c3fc4ab3 FBH |
146 | err |= __put_user(regs->hi, &sc->sc_mdhi); |
147 | err |= __put_user(regs->lo, &sc->sc_mdlo); | |
148 | if (cpu_has_dsp) { | |
149 | err |= __put_user(mfhi1(), &sc->sc_hi1); | |
150 | err |= __put_user(mflo1(), &sc->sc_lo1); | |
151 | err |= __put_user(mfhi2(), &sc->sc_hi2); | |
152 | err |= __put_user(mflo2(), &sc->sc_lo2); | |
153 | err |= __put_user(mfhi3(), &sc->sc_hi3); | |
154 | err |= __put_user(mflo3(), &sc->sc_lo3); | |
155 | err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); | |
156 | } | |
157 | ||
53dc8028 AN |
158 | used_math = !!used_math(); |
159 | err |= __put_user(used_math, &sc->sc_used_math); | |
c3fc4ab3 | 160 | |
53dc8028 | 161 | if (used_math) { |
c3fc4ab3 FBH |
162 | /* |
163 | * Save FPU state to signal context. Signal handler | |
164 | * will "inherit" current FPU state. | |
165 | */ | |
faea6234 | 166 | err |= protected_save_fp_context(sc); |
c3fc4ab3 FBH |
167 | } |
168 | return err; | |
169 | } | |
170 | ||
c6a2f467 AN |
171 | int fpcsr_pending(unsigned int __user *fpcsr) |
172 | { | |
173 | int err, sig = 0; | |
174 | unsigned int csr, enabled; | |
175 | ||
176 | err = __get_user(csr, fpcsr); | |
177 | enabled = FPU_CSR_UNI_X | ((csr & FPU_CSR_ALL_E) << 5); | |
178 | /* | |
179 | * If the signal handler set some FPU exceptions, clear it and | |
180 | * send SIGFPE. | |
181 | */ | |
182 | if (csr & enabled) { | |
183 | csr &= ~enabled; | |
184 | err |= __put_user(csr, fpcsr); | |
185 | sig = SIGFPE; | |
186 | } | |
187 | return err ?: sig; | |
188 | } | |
189 | ||
190 | static int | |
191 | check_and_restore_fp_context(struct sigcontext __user *sc) | |
192 | { | |
193 | int err, sig; | |
194 | ||
195 | err = sig = fpcsr_pending(&sc->sc_fpc_csr); | |
196 | if (err > 0) | |
197 | err = 0; | |
faea6234 | 198 | err |= protected_restore_fp_context(sc); |
c6a2f467 AN |
199 | return err ?: sig; |
200 | } | |
201 | ||
c3fc4ab3 FBH |
202 | int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
203 | { | |
204 | unsigned int used_math; | |
205 | unsigned long treg; | |
206 | int err = 0; | |
207 | int i; | |
208 | ||
209 | /* Always make any pending restarted system calls return -EINTR */ | |
210 | current_thread_info()->restart_block.fn = do_no_restart_syscall; | |
211 | ||
212 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); | |
9693a853 FBH |
213 | |
214 | #ifdef CONFIG_CPU_HAS_SMARTMIPS | |
215 | err |= __get_user(regs->acx, &sc->sc_acx); | |
216 | #endif | |
c3fc4ab3 FBH |
217 | err |= __get_user(regs->hi, &sc->sc_mdhi); |
218 | err |= __get_user(regs->lo, &sc->sc_mdlo); | |
219 | if (cpu_has_dsp) { | |
220 | err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); | |
221 | err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); | |
222 | err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); | |
223 | err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); | |
224 | err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); | |
225 | err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); | |
226 | err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); | |
227 | } | |
228 | ||
229 | for (i = 1; i < 32; i++) | |
230 | err |= __get_user(regs->regs[i], &sc->sc_regs[i]); | |
231 | ||
232 | err |= __get_user(used_math, &sc->sc_used_math); | |
233 | conditional_used_math(used_math); | |
234 | ||
53dc8028 | 235 | if (used_math) { |
c3fc4ab3 | 236 | /* restore fpu context if we have used it before */ |
c6a2f467 AN |
237 | if (!err) |
238 | err = check_and_restore_fp_context(sc); | |
c3fc4ab3 FBH |
239 | } else { |
240 | /* signal handler may have used FPU. Give it up. */ | |
53dc8028 | 241 | lose_fpu(0); |
c3fc4ab3 FBH |
242 | } |
243 | ||
c3fc4ab3 FBH |
244 | return err; |
245 | } | |
246 | ||
247 | void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, | |
248 | size_t frame_size) | |
249 | { | |
250 | unsigned long sp; | |
251 | ||
252 | /* Default to using normal stack */ | |
253 | sp = regs->regs[29]; | |
254 | ||
255 | /* | |
256 | * FPU emulator may have it's own trampoline active just | |
257 | * above the user stack, 16-bytes before the next lowest | |
258 | * 16 byte boundary. Try to avoid trashing it. | |
259 | */ | |
260 | sp -= 32; | |
261 | ||
262 | /* This is the X/Open sanctioned signal stack switching. */ | |
263 | if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0)) | |
264 | sp = current->sas_ss_sp + current->sas_ss_size; | |
265 | ||
266 | return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK)); | |
267 | } | |
268 | ||
269 | int install_sigtramp(unsigned int __user *tramp, unsigned int syscall) | |
270 | { | |
271 | int err; | |
272 | ||
273 | /* | |
274 | * Set up the return code ... | |
275 | * | |
276 | * li v0, __NR__foo_sigreturn | |
277 | * syscall | |
278 | */ | |
279 | ||
280 | err = __put_user(0x24020000 + syscall, tramp + 0); | |
601dde45 | 281 | err |= __put_user(0x0000000c , tramp + 1); |
c3fc4ab3 FBH |
282 | if (ICACHE_REFILLS_WORKAROUND_WAR) { |
283 | err |= __put_user(0, tramp + 2); | |
284 | err |= __put_user(0, tramp + 3); | |
285 | err |= __put_user(0, tramp + 4); | |
286 | err |= __put_user(0, tramp + 5); | |
287 | err |= __put_user(0, tramp + 6); | |
288 | err |= __put_user(0, tramp + 7); | |
289 | } | |
290 | flush_cache_sigtramp((unsigned long) tramp); | |
291 | ||
292 | return err; | |
293 | } | |
294 | ||
1da177e4 LT |
295 | /* |
296 | * Atomically swap in the new signal mask, and wait for a signal. | |
297 | */ | |
298 | ||
299 | #ifdef CONFIG_TRAD_SIGNALS | |
f90080a0 | 300 | asmlinkage int sys_sigsuspend(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 301 | { |
7b3e2fc8 | 302 | sigset_t newset; |
fe00f943 | 303 | sigset_t __user *uset; |
1da177e4 | 304 | |
fe00f943 | 305 | uset = (sigset_t __user *) regs.regs[4]; |
1da177e4 LT |
306 | if (copy_from_user(&newset, uset, sizeof(sigset_t))) |
307 | return -EFAULT; | |
308 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
309 | ||
310 | spin_lock_irq(¤t->sighand->siglock); | |
7b3e2fc8 | 311 | current->saved_sigmask = current->blocked; |
1da177e4 LT |
312 | current->blocked = newset; |
313 | recalc_sigpending(); | |
314 | spin_unlock_irq(¤t->sighand->siglock); | |
315 | ||
7b3e2fc8 RB |
316 | current->state = TASK_INTERRUPTIBLE; |
317 | schedule(); | |
318 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
319 | return -ERESTARTNOHAND; | |
1da177e4 LT |
320 | } |
321 | #endif | |
322 | ||
f90080a0 | 323 | asmlinkage int sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 324 | { |
7b3e2fc8 | 325 | sigset_t newset; |
fe00f943 | 326 | sigset_t __user *unewset; |
1da177e4 LT |
327 | size_t sigsetsize; |
328 | ||
329 | /* XXX Don't preclude handling different sized sigset_t's. */ | |
330 | sigsetsize = regs.regs[5]; | |
331 | if (sigsetsize != sizeof(sigset_t)) | |
332 | return -EINVAL; | |
333 | ||
fe00f943 | 334 | unewset = (sigset_t __user *) regs.regs[4]; |
1da177e4 LT |
335 | if (copy_from_user(&newset, unewset, sizeof(newset))) |
336 | return -EFAULT; | |
337 | sigdelsetmask(&newset, ~_BLOCKABLE); | |
338 | ||
339 | spin_lock_irq(¤t->sighand->siglock); | |
7b3e2fc8 | 340 | current->saved_sigmask = current->blocked; |
1da177e4 | 341 | current->blocked = newset; |
e0daad44 | 342 | recalc_sigpending(); |
1da177e4 LT |
343 | spin_unlock_irq(¤t->sighand->siglock); |
344 | ||
7b3e2fc8 RB |
345 | current->state = TASK_INTERRUPTIBLE; |
346 | schedule(); | |
347 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
348 | return -ERESTARTNOHAND; | |
1da177e4 LT |
349 | } |
350 | ||
351 | #ifdef CONFIG_TRAD_SIGNALS | |
dbda6ac0 RB |
352 | SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act, |
353 | struct sigaction __user *, oact) | |
1da177e4 LT |
354 | { |
355 | struct k_sigaction new_ka, old_ka; | |
356 | int ret; | |
357 | int err = 0; | |
358 | ||
359 | if (act) { | |
360 | old_sigset_t mask; | |
361 | ||
362 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
363 | return -EFAULT; | |
364 | err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler); | |
365 | err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
366 | err |= __get_user(mask, &act->sa_mask.sig[0]); | |
367 | if (err) | |
368 | return -EFAULT; | |
369 | ||
370 | siginitset(&new_ka.sa.sa_mask, mask); | |
371 | } | |
372 | ||
373 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
374 | ||
375 | if (!ret && oact) { | |
376 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
e0daad44 | 377 | return -EFAULT; |
1da177e4 LT |
378 | err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
379 | err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler); | |
380 | err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); | |
381 | err |= __put_user(0, &oact->sa_mask.sig[1]); | |
382 | err |= __put_user(0, &oact->sa_mask.sig[2]); | |
383 | err |= __put_user(0, &oact->sa_mask.sig[3]); | |
384 | if (err) | |
385 | return -EFAULT; | |
386 | } | |
387 | ||
388 | return ret; | |
389 | } | |
390 | #endif | |
391 | ||
392 | asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs) | |
393 | { | |
fe00f943 RB |
394 | const stack_t __user *uss = (const stack_t __user *) regs.regs[4]; |
395 | stack_t __user *uoss = (stack_t __user *) regs.regs[5]; | |
1da177e4 LT |
396 | unsigned long usp = regs.regs[29]; |
397 | ||
398 | return do_sigaltstack(uss, uoss, usp); | |
399 | } | |
400 | ||
1da177e4 | 401 | #ifdef CONFIG_TRAD_SIGNALS |
f90080a0 | 402 | asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 403 | { |
9bbf28a3 | 404 | struct sigframe __user *frame; |
1da177e4 | 405 | sigset_t blocked; |
c6a2f467 | 406 | int sig; |
1da177e4 | 407 | |
9bbf28a3 | 408 | frame = (struct sigframe __user *) regs.regs[29]; |
1da177e4 LT |
409 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
410 | goto badframe; | |
411 | if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked))) | |
412 | goto badframe; | |
413 | ||
414 | sigdelsetmask(&blocked, ~_BLOCKABLE); | |
415 | spin_lock_irq(¤t->sighand->siglock); | |
416 | current->blocked = blocked; | |
417 | recalc_sigpending(); | |
418 | spin_unlock_irq(¤t->sighand->siglock); | |
419 | ||
c6a2f467 AN |
420 | sig = restore_sigcontext(®s, &frame->sf_sc); |
421 | if (sig < 0) | |
1da177e4 | 422 | goto badframe; |
c6a2f467 AN |
423 | else if (sig) |
424 | force_sig(sig, current); | |
1da177e4 LT |
425 | |
426 | /* | |
427 | * Don't let your children do this ... | |
428 | */ | |
1da177e4 LT |
429 | __asm__ __volatile__( |
430 | "move\t$29, %0\n\t" | |
431 | "j\tsyscall_exit" | |
432 | :/* no outputs */ | |
433 | :"r" (®s)); | |
434 | /* Unreached */ | |
435 | ||
436 | badframe: | |
437 | force_sig(SIGSEGV, current); | |
438 | } | |
e50c0a8f | 439 | #endif /* CONFIG_TRAD_SIGNALS */ |
1da177e4 | 440 | |
f90080a0 | 441 | asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 442 | { |
9bbf28a3 | 443 | struct rt_sigframe __user *frame; |
1da177e4 LT |
444 | sigset_t set; |
445 | stack_t st; | |
c6a2f467 | 446 | int sig; |
1da177e4 | 447 | |
9bbf28a3 | 448 | frame = (struct rt_sigframe __user *) regs.regs[29]; |
1da177e4 LT |
449 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
450 | goto badframe; | |
451 | if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) | |
452 | goto badframe; | |
453 | ||
454 | sigdelsetmask(&set, ~_BLOCKABLE); | |
455 | spin_lock_irq(¤t->sighand->siglock); | |
456 | current->blocked = set; | |
457 | recalc_sigpending(); | |
458 | spin_unlock_irq(¤t->sighand->siglock); | |
459 | ||
c6a2f467 AN |
460 | sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext); |
461 | if (sig < 0) | |
1da177e4 | 462 | goto badframe; |
c6a2f467 AN |
463 | else if (sig) |
464 | force_sig(sig, current); | |
1da177e4 LT |
465 | |
466 | if (__copy_from_user(&st, &frame->rs_uc.uc_stack, sizeof(st))) | |
467 | goto badframe; | |
468 | /* It is more difficult to avoid calling this function than to | |
469 | call it and ignore errors. */ | |
9bbf28a3 | 470 | do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]); |
1da177e4 LT |
471 | |
472 | /* | |
473 | * Don't let your children do this ... | |
474 | */ | |
475 | __asm__ __volatile__( | |
476 | "move\t$29, %0\n\t" | |
477 | "j\tsyscall_exit" | |
478 | :/* no outputs */ | |
479 | :"r" (®s)); | |
480 | /* Unreached */ | |
481 | ||
482 | badframe: | |
483 | force_sig(SIGSEGV, current); | |
484 | } | |
485 | ||
486 | #ifdef CONFIG_TRAD_SIGNALS | |
151fd6ac | 487 | static int setup_frame(struct k_sigaction * ka, struct pt_regs *regs, |
1da177e4 LT |
488 | int signr, sigset_t *set) |
489 | { | |
9bbf28a3 | 490 | struct sigframe __user *frame; |
1da177e4 LT |
491 | int err = 0; |
492 | ||
493 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
494 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
495 | goto give_sigsegv; | |
496 | ||
601dde45 | 497 | err |= install_sigtramp(frame->sf_code, __NR_sigreturn); |
1da177e4 LT |
498 | |
499 | err |= setup_sigcontext(regs, &frame->sf_sc); | |
500 | err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set)); | |
501 | if (err) | |
502 | goto give_sigsegv; | |
503 | ||
504 | /* | |
505 | * Arguments to signal handler: | |
506 | * | |
507 | * a0 = signal number | |
508 | * a1 = 0 (should be cause) | |
509 | * a2 = pointer to struct sigcontext | |
510 | * | |
511 | * $25 and c0_epc point to the signal handler, $29 points to the | |
512 | * struct sigframe. | |
513 | */ | |
514 | regs->regs[ 4] = signr; | |
515 | regs->regs[ 5] = 0; | |
516 | regs->regs[ 6] = (unsigned long) &frame->sf_sc; | |
517 | regs->regs[29] = (unsigned long) frame; | |
518 | regs->regs[31] = (unsigned long) frame->sf_code; | |
519 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; | |
520 | ||
722bb63d | 521 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 | 522 | current->comm, current->pid, |
722bb63d | 523 | frame, regs->cp0_epc, regs->regs[31]); |
e0daad44 | 524 | return 0; |
1da177e4 LT |
525 | |
526 | give_sigsegv: | |
527 | force_sigsegv(signr, current); | |
7b3e2fc8 | 528 | return -EFAULT; |
1da177e4 LT |
529 | } |
530 | #endif | |
531 | ||
151fd6ac | 532 | static int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs, |
1da177e4 LT |
533 | int signr, sigset_t *set, siginfo_t *info) |
534 | { | |
9bbf28a3 | 535 | struct rt_sigframe __user *frame; |
1da177e4 LT |
536 | int err = 0; |
537 | ||
538 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
539 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
540 | goto give_sigsegv; | |
541 | ||
601dde45 | 542 | err |= install_sigtramp(frame->rs_code, __NR_rt_sigreturn); |
1da177e4 LT |
543 | |
544 | /* Create siginfo. */ | |
545 | err |= copy_siginfo_to_user(&frame->rs_info, info); | |
546 | ||
547 | /* Create the ucontext. */ | |
548 | err |= __put_user(0, &frame->rs_uc.uc_flags); | |
5665a0ac | 549 | err |= __put_user(NULL, &frame->rs_uc.uc_link); |
9c6031cc | 550 | err |= __put_user((void __user *)current->sas_ss_sp, |
1da177e4 LT |
551 | &frame->rs_uc.uc_stack.ss_sp); |
552 | err |= __put_user(sas_ss_flags(regs->regs[29]), | |
553 | &frame->rs_uc.uc_stack.ss_flags); | |
554 | err |= __put_user(current->sas_ss_size, | |
555 | &frame->rs_uc.uc_stack.ss_size); | |
556 | err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); | |
557 | err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); | |
558 | ||
559 | if (err) | |
560 | goto give_sigsegv; | |
561 | ||
562 | /* | |
563 | * Arguments to signal handler: | |
564 | * | |
565 | * a0 = signal number | |
566 | * a1 = 0 (should be cause) | |
567 | * a2 = pointer to ucontext | |
568 | * | |
569 | * $25 and c0_epc point to the signal handler, $29 points to | |
570 | * the struct rt_sigframe. | |
571 | */ | |
572 | regs->regs[ 4] = signr; | |
573 | regs->regs[ 5] = (unsigned long) &frame->rs_info; | |
574 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
575 | regs->regs[29] = (unsigned long) frame; | |
576 | regs->regs[31] = (unsigned long) frame->rs_code; | |
577 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; | |
578 | ||
722bb63d | 579 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 LT |
580 | current->comm, current->pid, |
581 | frame, regs->cp0_epc, regs->regs[31]); | |
722bb63d | 582 | |
7b3e2fc8 | 583 | return 0; |
1da177e4 LT |
584 | |
585 | give_sigsegv: | |
586 | force_sigsegv(signr, current); | |
7b3e2fc8 | 587 | return -EFAULT; |
1da177e4 LT |
588 | } |
589 | ||
151fd6ac RB |
590 | struct mips_abi mips_abi = { |
591 | #ifdef CONFIG_TRAD_SIGNALS | |
592 | .setup_frame = setup_frame, | |
593 | #endif | |
594 | .setup_rt_frame = setup_rt_frame, | |
595 | .restart = __NR_restart_syscall | |
596 | }; | |
597 | ||
e692eb30 | 598 | static int handle_signal(unsigned long sig, siginfo_t *info, |
1da177e4 LT |
599 | struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs) |
600 | { | |
129bc8f7 RB |
601 | int ret; |
602 | ||
1da177e4 LT |
603 | switch(regs->regs[0]) { |
604 | case ERESTART_RESTARTBLOCK: | |
605 | case ERESTARTNOHAND: | |
606 | regs->regs[2] = EINTR; | |
607 | break; | |
608 | case ERESTARTSYS: | |
7b3e2fc8 | 609 | if (!(ka->sa.sa_flags & SA_RESTART)) { |
1da177e4 LT |
610 | regs->regs[2] = EINTR; |
611 | break; | |
612 | } | |
613 | /* fallthrough */ | |
614 | case ERESTARTNOINTR: /* Userland will reload $v0. */ | |
615 | regs->regs[7] = regs->regs[26]; | |
616 | regs->cp0_epc -= 8; | |
617 | } | |
618 | ||
619 | regs->regs[0] = 0; /* Don't deal with this again. */ | |
620 | ||
e50c0a8f | 621 | if (sig_uses_siginfo(ka)) |
129bc8f7 | 622 | ret = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info); |
1da177e4 | 623 | else |
129bc8f7 | 624 | ret = current->thread.abi->setup_frame(ka, regs, sig, oldset); |
1da177e4 | 625 | |
69be8f18 | 626 | spin_lock_irq(¤t->sighand->siglock); |
21a151d8 | 627 | sigorsets(¤t->blocked, ¤t->blocked, &ka->sa.sa_mask); |
69be8f18 | 628 | if (!(ka->sa.sa_flags & SA_NODEFER)) |
21a151d8 | 629 | sigaddset(¤t->blocked, sig); |
69be8f18 SR |
630 | recalc_sigpending(); |
631 | spin_unlock_irq(¤t->sighand->siglock); | |
129bc8f7 RB |
632 | |
633 | return ret; | |
1da177e4 LT |
634 | } |
635 | ||
151fd6ac | 636 | static void do_signal(struct pt_regs *regs) |
1da177e4 LT |
637 | { |
638 | struct k_sigaction ka; | |
7b3e2fc8 | 639 | sigset_t *oldset; |
1da177e4 LT |
640 | siginfo_t info; |
641 | int signr; | |
642 | ||
1da177e4 LT |
643 | /* |
644 | * We want the common case to go fast, which is why we may in certain | |
645 | * cases get here from kernel mode. Just return without doing anything | |
646 | * if so. | |
647 | */ | |
648 | if (!user_mode(regs)) | |
40ac5d47 | 649 | return; |
1da177e4 | 650 | |
7b3e2fc8 RB |
651 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) |
652 | oldset = ¤t->saved_sigmask; | |
653 | else | |
1da177e4 LT |
654 | oldset = ¤t->blocked; |
655 | ||
656 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); | |
7b3e2fc8 RB |
657 | if (signr > 0) { |
658 | /* Whee! Actually deliver the signal. */ | |
659 | if (handle_signal(signr, &info, &ka, oldset, regs) == 0) { | |
660 | /* | |
661 | * A signal was successfully delivered; the saved | |
662 | * sigmask will have been stored in the signal frame, | |
663 | * and will be restored by sigreturn, so we can simply | |
664 | * clear the TIF_RESTORE_SIGMASK flag. | |
665 | */ | |
666 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) | |
667 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
668 | } | |
45887e12 RB |
669 | |
670 | return; | |
7b3e2fc8 | 671 | } |
1da177e4 | 672 | |
1da177e4 LT |
673 | /* |
674 | * Who's code doesn't conform to the restartable syscall convention | |
675 | * dies here!!! The li instruction, a single machine instruction, | |
676 | * must directly be followed by the syscall instruction. | |
677 | */ | |
678 | if (regs->regs[0]) { | |
679 | if (regs->regs[2] == ERESTARTNOHAND || | |
680 | regs->regs[2] == ERESTARTSYS || | |
681 | regs->regs[2] == ERESTARTNOINTR) { | |
682 | regs->regs[7] = regs->regs[26]; | |
683 | regs->cp0_epc -= 8; | |
684 | } | |
685 | if (regs->regs[2] == ERESTART_RESTARTBLOCK) { | |
151fd6ac | 686 | regs->regs[2] = current->thread.abi->restart; |
1da177e4 LT |
687 | regs->regs[7] = regs->regs[26]; |
688 | regs->cp0_epc -= 4; | |
689 | } | |
13fdd31a | 690 | regs->regs[0] = 0; /* Don't deal with this again. */ |
1da177e4 | 691 | } |
7b3e2fc8 RB |
692 | |
693 | /* | |
694 | * If there's no signal to deliver, we just put the saved sigmask | |
695 | * back | |
696 | */ | |
697 | if (test_thread_flag(TIF_RESTORE_SIGMASK)) { | |
698 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
699 | sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); | |
700 | } | |
1da177e4 LT |
701 | } |
702 | ||
703 | /* | |
704 | * notification of userspace execution resumption | |
7b3e2fc8 | 705 | * - triggered by the TIF_WORK_MASK flags |
1da177e4 | 706 | */ |
7b3e2fc8 | 707 | asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, |
1da177e4 LT |
708 | __u32 thread_info_flags) |
709 | { | |
710 | /* deal with pending signal delivery */ | |
7b3e2fc8 | 711 | if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)) |
151fd6ac | 712 | do_signal(regs); |
d0420c83 DH |
713 | |
714 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { | |
715 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
716 | tracehook_notify_resume(regs); | |
ee18d64c DH |
717 | if (current->replacement_session_keyring) |
718 | key_replace_session_keyring(); | |
d0420c83 | 719 | } |
1da177e4 | 720 | } |
137f6f3e RB |
721 | |
722 | #ifdef CONFIG_SMP | |
723 | static int smp_save_fp_context(struct sigcontext __user *sc) | |
724 | { | |
725 | return raw_cpu_has_fpu | |
726 | ? _save_fp_context(sc) | |
727 | : fpu_emulator_save_context(sc); | |
728 | } | |
729 | ||
730 | static int smp_restore_fp_context(struct sigcontext __user *sc) | |
731 | { | |
732 | return raw_cpu_has_fpu | |
733 | ? _restore_fp_context(sc) | |
734 | : fpu_emulator_restore_context(sc); | |
735 | } | |
736 | #endif | |
737 | ||
738 | static int signal_setup(void) | |
739 | { | |
740 | #ifdef CONFIG_SMP | |
741 | /* For now just do the cpu_has_fpu check when the functions are invoked */ | |
742 | save_fp_context = smp_save_fp_context; | |
743 | restore_fp_context = smp_restore_fp_context; | |
744 | #else | |
745 | if (cpu_has_fpu) { | |
746 | save_fp_context = _save_fp_context; | |
747 | restore_fp_context = _restore_fp_context; | |
748 | } else { | |
749 | save_fp_context = fpu_emulator_save_context; | |
750 | restore_fp_context = fpu_emulator_restore_context; | |
751 | } | |
752 | #endif | |
753 | ||
754 | return 0; | |
755 | } | |
756 | ||
757 | arch_initcall(signal_setup); |