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 | ||
2db9ca0a PB |
44 | static int (*save_fp_context)(void __user *sc); |
45 | static int (*restore_fp_context)(void __user *sc); | |
137f6f3e | 46 | |
66680583 RB |
47 | struct sigframe { |
48 | u32 sf_ass[4]; /* argument save space for o32 */ | |
d814c28c | 49 | u32 sf_pad[2]; /* Was: signal trampoline */ |
66680583 RB |
50 | struct sigcontext sf_sc; |
51 | sigset_t sf_mask; | |
52 | }; | |
53 | ||
c0b9bae9 FBH |
54 | struct rt_sigframe { |
55 | u32 rs_ass[4]; /* argument save space for o32 */ | |
d814c28c | 56 | u32 rs_pad[2]; /* Was: signal trampoline */ |
c0b9bae9 FBH |
57 | struct siginfo rs_info; |
58 | struct ucontext rs_uc; | |
59 | }; | |
60 | ||
b2ead528 PB |
61 | /* |
62 | * Thread saved context copy to/from a signal context presumed to be on the | |
63 | * user stack, and therefore accessed with appropriate macros from uaccess.h. | |
64 | */ | |
2db9ca0a | 65 | static int copy_fp_to_sigcontext(void __user *sc) |
b2ead528 | 66 | { |
2db9ca0a PB |
67 | struct mips_abi *abi = current->thread.abi; |
68 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; | |
69 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; | |
b2ead528 PB |
70 | int i; |
71 | int err = 0; | |
6f0aba63 | 72 | int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1; |
b2ead528 | 73 | |
6f0aba63 | 74 | for (i = 0; i < NUM_FPU_REGS; i += inc) { |
b2ead528 PB |
75 | err |= |
76 | __put_user(get_fpr64(¤t->thread.fpu.fpr[i], 0), | |
2db9ca0a | 77 | &fpregs[i]); |
b2ead528 | 78 | } |
2db9ca0a | 79 | err |= __put_user(current->thread.fpu.fcr31, csr); |
b2ead528 PB |
80 | |
81 | return err; | |
82 | } | |
83 | ||
2db9ca0a | 84 | static int copy_fp_from_sigcontext(void __user *sc) |
b2ead528 | 85 | { |
2db9ca0a PB |
86 | struct mips_abi *abi = current->thread.abi; |
87 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; | |
88 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; | |
b2ead528 PB |
89 | int i; |
90 | int err = 0; | |
6f0aba63 | 91 | int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1; |
b2ead528 PB |
92 | u64 fpr_val; |
93 | ||
6f0aba63 | 94 | for (i = 0; i < NUM_FPU_REGS; i += inc) { |
2db9ca0a | 95 | err |= __get_user(fpr_val, &fpregs[i]); |
b2ead528 PB |
96 | set_fpr64(¤t->thread.fpu.fpr[i], 0, fpr_val); |
97 | } | |
2db9ca0a | 98 | err |= __get_user(current->thread.fpu.fcr31, csr); |
b2ead528 PB |
99 | |
100 | return err; | |
101 | } | |
102 | ||
2db9ca0a PB |
103 | /* |
104 | * Wrappers for the assembly _{save,restore}_fp_context functions. | |
105 | */ | |
106 | static int save_hw_fp_context(void __user *sc) | |
107 | { | |
108 | struct mips_abi *abi = current->thread.abi; | |
109 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; | |
110 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; | |
111 | ||
112 | return _save_fp_context(fpregs, csr); | |
113 | } | |
114 | ||
115 | static int restore_hw_fp_context(void __user *sc) | |
116 | { | |
117 | struct mips_abi *abi = current->thread.abi; | |
118 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; | |
119 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; | |
120 | ||
121 | return _restore_fp_context(fpregs, csr); | |
122 | } | |
123 | ||
c3fc4ab3 FBH |
124 | /* |
125 | * Helper routines | |
126 | */ | |
2db9ca0a | 127 | static int protected_save_fp_context(void __user *sc) |
faea6234 | 128 | { |
2db9ca0a PB |
129 | struct mips_abi *abi = current->thread.abi; |
130 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; | |
131 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; | |
64243c2a PB |
132 | uint32_t __user *used_math = sc + abi->off_sc_used_math; |
133 | unsigned int used; | |
faea6234 | 134 | int err; |
689ee856 | 135 | |
64243c2a PB |
136 | used = !!used_math(); |
137 | err = __put_user(used, used_math); | |
138 | if (err || !used) | |
139 | return err; | |
140 | ||
689ee856 PB |
141 | /* |
142 | * EVA does not have userland equivalents of ldc1 or sdc1, so | |
143 | * save to the kernel FP context & copy that to userland below. | |
144 | */ | |
145 | if (config_enabled(CONFIG_EVA)) | |
146 | lose_fpu(1); | |
147 | ||
faea6234 AN |
148 | while (1) { |
149 | lock_fpu_owner(); | |
ff3aa5f2 PB |
150 | if (is_fpu_owner()) { |
151 | err = save_fp_context(sc); | |
152 | unlock_fpu_owner(); | |
153 | } else { | |
154 | unlock_fpu_owner(); | |
155 | err = copy_fp_to_sigcontext(sc); | |
156 | } | |
faea6234 AN |
157 | if (likely(!err)) |
158 | break; | |
159 | /* touch the sigcontext and try again */ | |
2db9ca0a PB |
160 | err = __put_user(0, &fpregs[0]) | |
161 | __put_user(0, &fpregs[31]) | | |
162 | __put_user(0, csr); | |
faea6234 AN |
163 | if (err) |
164 | break; /* really bad sigcontext */ | |
165 | } | |
689ee856 | 166 | |
faea6234 AN |
167 | return err; |
168 | } | |
169 | ||
2db9ca0a | 170 | static int protected_restore_fp_context(void __user *sc) |
faea6234 | 171 | { |
2db9ca0a PB |
172 | struct mips_abi *abi = current->thread.abi; |
173 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; | |
174 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; | |
64243c2a PB |
175 | uint32_t __user *used_math = sc + abi->off_sc_used_math; |
176 | unsigned int used; | |
177 | int err, sig, tmp __maybe_unused; | |
178 | ||
179 | err = __get_user(used, used_math); | |
180 | conditional_used_math(used); | |
181 | ||
182 | /* | |
183 | * The signal handler may have used FPU; give it up if the program | |
184 | * doesn't want it following sigreturn. | |
185 | */ | |
186 | if (err || !used) { | |
187 | lose_fpu(0); | |
188 | return err; | |
189 | } | |
190 | ||
191 | err = sig = fpcsr_pending(csr); | |
192 | if (err < 0) | |
193 | return err; | |
689ee856 PB |
194 | |
195 | /* | |
196 | * EVA does not have userland equivalents of ldc1 or sdc1, so we | |
197 | * disable the FPU here such that the code below simply copies to | |
198 | * the kernel FP context. | |
199 | */ | |
200 | if (config_enabled(CONFIG_EVA)) | |
201 | lose_fpu(0); | |
202 | ||
faea6234 AN |
203 | while (1) { |
204 | lock_fpu_owner(); | |
ff3aa5f2 PB |
205 | if (is_fpu_owner()) { |
206 | err = restore_fp_context(sc); | |
207 | unlock_fpu_owner(); | |
208 | } else { | |
209 | unlock_fpu_owner(); | |
210 | err = copy_fp_from_sigcontext(sc); | |
211 | } | |
faea6234 AN |
212 | if (likely(!err)) |
213 | break; | |
214 | /* touch the sigcontext and try again */ | |
2db9ca0a PB |
215 | err = __get_user(tmp, &fpregs[0]) | |
216 | __get_user(tmp, &fpregs[31]) | | |
217 | __get_user(tmp, csr); | |
faea6234 AN |
218 | if (err) |
219 | break; /* really bad sigcontext */ | |
220 | } | |
689ee856 | 221 | |
64243c2a | 222 | return err ?: sig; |
faea6234 AN |
223 | } |
224 | ||
c3fc4ab3 FBH |
225 | int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
226 | { | |
227 | int err = 0; | |
228 | int i; | |
229 | ||
230 | err |= __put_user(regs->cp0_epc, &sc->sc_pc); | |
231 | ||
232 | err |= __put_user(0, &sc->sc_regs[0]); | |
233 | for (i = 1; i < 32; i++) | |
234 | err |= __put_user(regs->regs[i], &sc->sc_regs[i]); | |
235 | ||
9693a853 FBH |
236 | #ifdef CONFIG_CPU_HAS_SMARTMIPS |
237 | err |= __put_user(regs->acx, &sc->sc_acx); | |
238 | #endif | |
c3fc4ab3 FBH |
239 | err |= __put_user(regs->hi, &sc->sc_mdhi); |
240 | err |= __put_user(regs->lo, &sc->sc_mdlo); | |
241 | if (cpu_has_dsp) { | |
242 | err |= __put_user(mfhi1(), &sc->sc_hi1); | |
243 | err |= __put_user(mflo1(), &sc->sc_lo1); | |
244 | err |= __put_user(mfhi2(), &sc->sc_hi2); | |
245 | err |= __put_user(mflo2(), &sc->sc_lo2); | |
246 | err |= __put_user(mfhi3(), &sc->sc_hi3); | |
247 | err |= __put_user(mflo3(), &sc->sc_lo3); | |
248 | err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); | |
249 | } | |
250 | ||
c3fc4ab3 | 251 | |
64243c2a PB |
252 | /* |
253 | * Save FPU state to signal context. Signal handler | |
254 | * will "inherit" current FPU state. | |
255 | */ | |
256 | err |= protected_save_fp_context(sc); | |
257 | ||
c3fc4ab3 FBH |
258 | return err; |
259 | } | |
260 | ||
c6a2f467 AN |
261 | int fpcsr_pending(unsigned int __user *fpcsr) |
262 | { | |
263 | int err, sig = 0; | |
264 | unsigned int csr, enabled; | |
265 | ||
266 | err = __get_user(csr, fpcsr); | |
267 | enabled = FPU_CSR_UNI_X | ((csr & FPU_CSR_ALL_E) << 5); | |
268 | /* | |
269 | * If the signal handler set some FPU exceptions, clear it and | |
270 | * send SIGFPE. | |
271 | */ | |
272 | if (csr & enabled) { | |
273 | csr &= ~enabled; | |
274 | err |= __put_user(csr, fpcsr); | |
275 | sig = SIGFPE; | |
276 | } | |
277 | return err ?: sig; | |
278 | } | |
279 | ||
c3fc4ab3 FBH |
280 | int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
281 | { | |
c3fc4ab3 FBH |
282 | unsigned long treg; |
283 | int err = 0; | |
284 | int i; | |
285 | ||
286 | /* Always make any pending restarted system calls return -EINTR */ | |
f56141e3 | 287 | current->restart_block.fn = do_no_restart_syscall; |
c3fc4ab3 FBH |
288 | |
289 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); | |
9693a853 FBH |
290 | |
291 | #ifdef CONFIG_CPU_HAS_SMARTMIPS | |
292 | err |= __get_user(regs->acx, &sc->sc_acx); | |
293 | #endif | |
c3fc4ab3 FBH |
294 | err |= __get_user(regs->hi, &sc->sc_mdhi); |
295 | err |= __get_user(regs->lo, &sc->sc_mdlo); | |
296 | if (cpu_has_dsp) { | |
297 | err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); | |
298 | err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); | |
299 | err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); | |
300 | err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); | |
301 | err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); | |
302 | err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); | |
303 | err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); | |
304 | } | |
305 | ||
306 | for (i = 1; i < 32; i++) | |
307 | err |= __get_user(regs->regs[i], &sc->sc_regs[i]); | |
308 | ||
64243c2a | 309 | return err ?: protected_restore_fp_context(sc); |
c3fc4ab3 FBH |
310 | } |
311 | ||
7c4f5635 | 312 | void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, |
c3fc4ab3 FBH |
313 | size_t frame_size) |
314 | { | |
315 | unsigned long sp; | |
316 | ||
317 | /* Default to using normal stack */ | |
318 | sp = regs->regs[29]; | |
319 | ||
320 | /* | |
321 | * FPU emulator may have it's own trampoline active just | |
322 | * above the user stack, 16-bytes before the next lowest | |
323 | * 16 byte boundary. Try to avoid trashing it. | |
324 | */ | |
325 | sp -= 32; | |
326 | ||
7c4f5635 | 327 | sp = sigsp(sp, ksig); |
c3fc4ab3 FBH |
328 | |
329 | return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK)); | |
330 | } | |
331 | ||
1da177e4 LT |
332 | /* |
333 | * Atomically swap in the new signal mask, and wait for a signal. | |
334 | */ | |
335 | ||
336 | #ifdef CONFIG_TRAD_SIGNALS | |
1910f4ab | 337 | SYSCALL_DEFINE1(sigsuspend, sigset_t __user *, uset) |
1da177e4 | 338 | { |
1910f4ab | 339 | return sys_rt_sigsuspend(uset, sizeof(sigset_t)); |
1da177e4 LT |
340 | } |
341 | #endif | |
342 | ||
1da177e4 | 343 | #ifdef CONFIG_TRAD_SIGNALS |
dbda6ac0 RB |
344 | SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act, |
345 | struct sigaction __user *, oact) | |
1da177e4 LT |
346 | { |
347 | struct k_sigaction new_ka, old_ka; | |
348 | int ret; | |
349 | int err = 0; | |
350 | ||
351 | if (act) { | |
352 | old_sigset_t mask; | |
353 | ||
354 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
355 | return -EFAULT; | |
356 | err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler); | |
357 | err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
358 | err |= __get_user(mask, &act->sa_mask.sig[0]); | |
359 | if (err) | |
360 | return -EFAULT; | |
361 | ||
362 | siginitset(&new_ka.sa.sa_mask, mask); | |
363 | } | |
364 | ||
365 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
366 | ||
367 | if (!ret && oact) { | |
368 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
e0daad44 | 369 | return -EFAULT; |
1da177e4 LT |
370 | err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
371 | err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler); | |
372 | err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); | |
373 | err |= __put_user(0, &oact->sa_mask.sig[1]); | |
374 | err |= __put_user(0, &oact->sa_mask.sig[2]); | |
375 | err |= __put_user(0, &oact->sa_mask.sig[3]); | |
376 | if (err) | |
377 | return -EFAULT; | |
378 | } | |
379 | ||
380 | return ret; | |
381 | } | |
382 | #endif | |
383 | ||
1da177e4 | 384 | #ifdef CONFIG_TRAD_SIGNALS |
f90080a0 | 385 | asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 386 | { |
9bbf28a3 | 387 | struct sigframe __user *frame; |
1da177e4 | 388 | sigset_t blocked; |
c6a2f467 | 389 | int sig; |
1da177e4 | 390 | |
9bbf28a3 | 391 | frame = (struct sigframe __user *) regs.regs[29]; |
1da177e4 LT |
392 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
393 | goto badframe; | |
394 | if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked))) | |
395 | goto badframe; | |
396 | ||
8598f3cd | 397 | set_current_blocked(&blocked); |
1da177e4 | 398 | |
c6a2f467 AN |
399 | sig = restore_sigcontext(®s, &frame->sf_sc); |
400 | if (sig < 0) | |
1da177e4 | 401 | goto badframe; |
c6a2f467 AN |
402 | else if (sig) |
403 | force_sig(sig, current); | |
1da177e4 LT |
404 | |
405 | /* | |
406 | * Don't let your children do this ... | |
407 | */ | |
1da177e4 LT |
408 | __asm__ __volatile__( |
409 | "move\t$29, %0\n\t" | |
410 | "j\tsyscall_exit" | |
411 | :/* no outputs */ | |
412 | :"r" (®s)); | |
413 | /* Unreached */ | |
414 | ||
415 | badframe: | |
416 | force_sig(SIGSEGV, current); | |
417 | } | |
e50c0a8f | 418 | #endif /* CONFIG_TRAD_SIGNALS */ |
1da177e4 | 419 | |
f90080a0 | 420 | asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 421 | { |
9bbf28a3 | 422 | struct rt_sigframe __user *frame; |
1da177e4 | 423 | sigset_t set; |
c6a2f467 | 424 | int sig; |
1da177e4 | 425 | |
9bbf28a3 | 426 | frame = (struct rt_sigframe __user *) regs.regs[29]; |
1da177e4 LT |
427 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
428 | goto badframe; | |
429 | if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) | |
430 | goto badframe; | |
431 | ||
8598f3cd | 432 | set_current_blocked(&set); |
1da177e4 | 433 | |
c6a2f467 AN |
434 | sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext); |
435 | if (sig < 0) | |
1da177e4 | 436 | goto badframe; |
c6a2f467 AN |
437 | else if (sig) |
438 | force_sig(sig, current); | |
1da177e4 | 439 | |
ea536ad4 AV |
440 | if (restore_altstack(&frame->rs_uc.uc_stack)) |
441 | goto badframe; | |
1da177e4 LT |
442 | |
443 | /* | |
444 | * Don't let your children do this ... | |
445 | */ | |
446 | __asm__ __volatile__( | |
447 | "move\t$29, %0\n\t" | |
448 | "j\tsyscall_exit" | |
449 | :/* no outputs */ | |
450 | :"r" (®s)); | |
451 | /* Unreached */ | |
452 | ||
453 | badframe: | |
454 | force_sig(SIGSEGV, current); | |
455 | } | |
456 | ||
457 | #ifdef CONFIG_TRAD_SIGNALS | |
81d103bf RW |
458 | static int setup_frame(void *sig_return, struct ksignal *ksig, |
459 | struct pt_regs *regs, sigset_t *set) | |
1da177e4 | 460 | { |
9bbf28a3 | 461 | struct sigframe __user *frame; |
1da177e4 LT |
462 | int err = 0; |
463 | ||
7c4f5635 | 464 | frame = get_sigframe(ksig, regs, sizeof(*frame)); |
1da177e4 | 465 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) |
81d103bf | 466 | return -EFAULT; |
1da177e4 | 467 | |
1da177e4 LT |
468 | err |= setup_sigcontext(regs, &frame->sf_sc); |
469 | err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set)); | |
470 | if (err) | |
81d103bf | 471 | return -EFAULT; |
1da177e4 LT |
472 | |
473 | /* | |
474 | * Arguments to signal handler: | |
475 | * | |
476 | * a0 = signal number | |
477 | * a1 = 0 (should be cause) | |
478 | * a2 = pointer to struct sigcontext | |
479 | * | |
480 | * $25 and c0_epc point to the signal handler, $29 points to the | |
481 | * struct sigframe. | |
482 | */ | |
81d103bf | 483 | regs->regs[ 4] = ksig->sig; |
1da177e4 LT |
484 | regs->regs[ 5] = 0; |
485 | regs->regs[ 6] = (unsigned long) &frame->sf_sc; | |
486 | regs->regs[29] = (unsigned long) frame; | |
d814c28c | 487 | regs->regs[31] = (unsigned long) sig_return; |
81d103bf | 488 | regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 | 489 | |
722bb63d | 490 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 | 491 | current->comm, current->pid, |
722bb63d | 492 | frame, regs->cp0_epc, regs->regs[31]); |
e0daad44 | 493 | return 0; |
1da177e4 LT |
494 | } |
495 | #endif | |
496 | ||
81d103bf RW |
497 | static int setup_rt_frame(void *sig_return, struct ksignal *ksig, |
498 | struct pt_regs *regs, sigset_t *set) | |
1da177e4 | 499 | { |
9bbf28a3 | 500 | struct rt_sigframe __user *frame; |
1da177e4 LT |
501 | int err = 0; |
502 | ||
7c4f5635 | 503 | frame = get_sigframe(ksig, regs, sizeof(*frame)); |
1da177e4 | 504 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) |
81d103bf | 505 | return -EFAULT; |
1da177e4 | 506 | |
1da177e4 | 507 | /* Create siginfo. */ |
81d103bf | 508 | err |= copy_siginfo_to_user(&frame->rs_info, &ksig->info); |
1da177e4 | 509 | |
70342287 | 510 | /* Create the ucontext. */ |
1da177e4 | 511 | err |= __put_user(0, &frame->rs_uc.uc_flags); |
5665a0ac | 512 | err |= __put_user(NULL, &frame->rs_uc.uc_link); |
ea536ad4 | 513 | err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]); |
1da177e4 LT |
514 | err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); |
515 | err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); | |
516 | ||
517 | if (err) | |
81d103bf | 518 | return -EFAULT; |
1da177e4 LT |
519 | |
520 | /* | |
521 | * Arguments to signal handler: | |
522 | * | |
523 | * a0 = signal number | |
524 | * a1 = 0 (should be cause) | |
525 | * a2 = pointer to ucontext | |
526 | * | |
527 | * $25 and c0_epc point to the signal handler, $29 points to | |
528 | * the struct rt_sigframe. | |
529 | */ | |
81d103bf | 530 | regs->regs[ 4] = ksig->sig; |
1da177e4 LT |
531 | regs->regs[ 5] = (unsigned long) &frame->rs_info; |
532 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
533 | regs->regs[29] = (unsigned long) frame; | |
d814c28c | 534 | regs->regs[31] = (unsigned long) sig_return; |
81d103bf | 535 | regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 | 536 | |
722bb63d | 537 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 LT |
538 | current->comm, current->pid, |
539 | frame, regs->cp0_epc, regs->regs[31]); | |
722bb63d | 540 | |
7b3e2fc8 | 541 | return 0; |
1da177e4 LT |
542 | } |
543 | ||
151fd6ac RB |
544 | struct mips_abi mips_abi = { |
545 | #ifdef CONFIG_TRAD_SIGNALS | |
546 | .setup_frame = setup_frame, | |
d814c28c | 547 | .signal_return_offset = offsetof(struct mips_vdso, signal_trampoline), |
151fd6ac | 548 | #endif |
70342287 | 549 | .setup_rt_frame = setup_rt_frame, |
d814c28c DD |
550 | .rt_signal_return_offset = |
551 | offsetof(struct mips_vdso, rt_signal_trampoline), | |
77856100 PB |
552 | .restart = __NR_restart_syscall, |
553 | ||
554 | .off_sc_fpregs = offsetof(struct sigcontext, sc_fpregs), | |
555 | .off_sc_fpc_csr = offsetof(struct sigcontext, sc_fpc_csr), | |
556 | .off_sc_used_math = offsetof(struct sigcontext, sc_used_math), | |
151fd6ac RB |
557 | }; |
558 | ||
81d103bf | 559 | static void handle_signal(struct ksignal *ksig, struct pt_regs *regs) |
1da177e4 | 560 | { |
b7f9a11a | 561 | sigset_t *oldset = sigmask_to_save(); |
129bc8f7 | 562 | int ret; |
d814c28c | 563 | struct mips_abi *abi = current->thread.abi; |
01be057b DL |
564 | #ifdef CONFIG_CPU_MICROMIPS |
565 | void *vdso; | |
2fabc7d2 | 566 | unsigned long tmp = (unsigned long)current->mm->context.vdso; |
01be057b DL |
567 | |
568 | set_isa16_mode(tmp); | |
569 | vdso = (void *)tmp; | |
570 | #else | |
d814c28c | 571 | void *vdso = current->mm->context.vdso; |
01be057b | 572 | #endif |
129bc8f7 | 573 | |
8f5a00eb AV |
574 | if (regs->regs[0]) { |
575 | switch(regs->regs[2]) { | |
576 | case ERESTART_RESTARTBLOCK: | |
577 | case ERESTARTNOHAND: | |
1da177e4 LT |
578 | regs->regs[2] = EINTR; |
579 | break; | |
8f5a00eb | 580 | case ERESTARTSYS: |
81d103bf | 581 | if (!(ksig->ka.sa.sa_flags & SA_RESTART)) { |
8f5a00eb AV |
582 | regs->regs[2] = EINTR; |
583 | break; | |
584 | } | |
585 | /* fallthrough */ | |
586 | case ERESTARTNOINTR: | |
587 | regs->regs[7] = regs->regs[26]; | |
588 | regs->regs[2] = regs->regs[0]; | |
589 | regs->cp0_epc -= 4; | |
1da177e4 | 590 | } |
1da177e4 | 591 | |
70342287 | 592 | regs->regs[0] = 0; /* Don't deal with this again. */ |
8f5a00eb | 593 | } |
1da177e4 | 594 | |
81d103bf | 595 | if (sig_uses_siginfo(&ksig->ka)) |
d814c28c | 596 | ret = abi->setup_rt_frame(vdso + abi->rt_signal_return_offset, |
81d103bf | 597 | ksig, regs, oldset); |
1da177e4 | 598 | else |
81d103bf RW |
599 | ret = abi->setup_frame(vdso + abi->signal_return_offset, ksig, |
600 | regs, oldset); | |
062ab57b | 601 | |
81d103bf | 602 | signal_setup_done(ret, ksig, 0); |
1da177e4 LT |
603 | } |
604 | ||
151fd6ac | 605 | static void do_signal(struct pt_regs *regs) |
1da177e4 | 606 | { |
81d103bf | 607 | struct ksignal ksig; |
1da177e4 | 608 | |
81d103bf | 609 | if (get_signal(&ksig)) { |
70342287 | 610 | /* Whee! Actually deliver the signal. */ |
81d103bf | 611 | handle_signal(&ksig, regs); |
45887e12 | 612 | return; |
7b3e2fc8 | 613 | } |
1da177e4 | 614 | |
1da177e4 | 615 | if (regs->regs[0]) { |
9ec9b5ac RB |
616 | switch (regs->regs[2]) { |
617 | case ERESTARTNOHAND: | |
618 | case ERESTARTSYS: | |
619 | case ERESTARTNOINTR: | |
8f5a00eb | 620 | regs->regs[2] = regs->regs[0]; |
1da177e4 | 621 | regs->regs[7] = regs->regs[26]; |
8f5a00eb | 622 | regs->cp0_epc -= 4; |
9ec9b5ac RB |
623 | break; |
624 | ||
625 | case ERESTART_RESTARTBLOCK: | |
151fd6ac | 626 | regs->regs[2] = current->thread.abi->restart; |
1da177e4 LT |
627 | regs->regs[7] = regs->regs[26]; |
628 | regs->cp0_epc -= 4; | |
9ec9b5ac | 629 | break; |
1da177e4 | 630 | } |
70342287 | 631 | regs->regs[0] = 0; /* Don't deal with this again. */ |
1da177e4 | 632 | } |
7b3e2fc8 RB |
633 | |
634 | /* | |
635 | * If there's no signal to deliver, we just put the saved sigmask | |
636 | * back | |
637 | */ | |
51a7b448 | 638 | restore_saved_sigmask(); |
1da177e4 LT |
639 | } |
640 | ||
641 | /* | |
642 | * notification of userspace execution resumption | |
7b3e2fc8 | 643 | * - triggered by the TIF_WORK_MASK flags |
1da177e4 | 644 | */ |
7b3e2fc8 | 645 | asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, |
1da177e4 LT |
646 | __u32 thread_info_flags) |
647 | { | |
1f717929 RB |
648 | local_irq_enable(); |
649 | ||
c3fc5cd5 RB |
650 | user_exit(); |
651 | ||
1da177e4 | 652 | /* deal with pending signal delivery */ |
6fd84c08 | 653 | if (thread_info_flags & _TIF_SIGPENDING) |
151fd6ac | 654 | do_signal(regs); |
d0420c83 DH |
655 | |
656 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { | |
657 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
658 | tracehook_notify_resume(regs); | |
659 | } | |
c3fc5cd5 RB |
660 | |
661 | user_enter(); | |
1da177e4 | 662 | } |
137f6f3e RB |
663 | |
664 | #ifdef CONFIG_SMP | |
2db9ca0a | 665 | static int smp_save_fp_context(void __user *sc) |
137f6f3e RB |
666 | { |
667 | return raw_cpu_has_fpu | |
2db9ca0a | 668 | ? save_hw_fp_context(sc) |
b2ead528 | 669 | : copy_fp_to_sigcontext(sc); |
137f6f3e RB |
670 | } |
671 | ||
2db9ca0a | 672 | static int smp_restore_fp_context(void __user *sc) |
137f6f3e RB |
673 | { |
674 | return raw_cpu_has_fpu | |
2db9ca0a | 675 | ? restore_hw_fp_context(sc) |
b2ead528 | 676 | : copy_fp_from_sigcontext(sc); |
137f6f3e RB |
677 | } |
678 | #endif | |
679 | ||
680 | static int signal_setup(void) | |
681 | { | |
682 | #ifdef CONFIG_SMP | |
683 | /* For now just do the cpu_has_fpu check when the functions are invoked */ | |
684 | save_fp_context = smp_save_fp_context; | |
685 | restore_fp_context = smp_restore_fp_context; | |
686 | #else | |
687 | if (cpu_has_fpu) { | |
2db9ca0a PB |
688 | save_fp_context = save_hw_fp_context; |
689 | restore_fp_context = restore_hw_fp_context; | |
137f6f3e | 690 | } else { |
14fa12df PB |
691 | save_fp_context = copy_fp_to_sigcontext; |
692 | restore_fp_context = copy_fp_from_sigcontext; | |
137f6f3e | 693 | } |
ca750649 | 694 | #endif /* CONFIG_SMP */ |
137f6f3e RB |
695 | |
696 | return 0; | |
697 | } | |
698 | ||
699 | arch_initcall(signal_setup); |