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; | |
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), | |
2db9ca0a | 76 | &fpregs[i]); |
b2ead528 | 77 | } |
2db9ca0a | 78 | err |= __put_user(current->thread.fpu.fcr31, csr); |
b2ead528 PB |
79 | |
80 | return err; | |
81 | } | |
82 | ||
2db9ca0a | 83 | static int copy_fp_from_sigcontext(void __user *sc) |
b2ead528 | 84 | { |
2db9ca0a PB |
85 | struct mips_abi *abi = current->thread.abi; |
86 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; | |
87 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; | |
b2ead528 PB |
88 | int i; |
89 | int err = 0; | |
90 | u64 fpr_val; | |
91 | ||
6bbfd65e | 92 | for (i = 0; i < NUM_FPU_REGS; i++) { |
2db9ca0a | 93 | err |= __get_user(fpr_val, &fpregs[i]); |
b2ead528 PB |
94 | set_fpr64(¤t->thread.fpu.fpr[i], 0, fpr_val); |
95 | } | |
2db9ca0a | 96 | err |= __get_user(current->thread.fpu.fcr31, csr); |
b2ead528 PB |
97 | |
98 | return err; | |
99 | } | |
100 | ||
2db9ca0a PB |
101 | /* |
102 | * Wrappers for the assembly _{save,restore}_fp_context functions. | |
103 | */ | |
104 | static int save_hw_fp_context(void __user *sc) | |
105 | { | |
106 | struct mips_abi *abi = current->thread.abi; | |
107 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; | |
108 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; | |
109 | ||
110 | return _save_fp_context(fpregs, csr); | |
111 | } | |
112 | ||
113 | static int restore_hw_fp_context(void __user *sc) | |
114 | { | |
115 | struct mips_abi *abi = current->thread.abi; | |
116 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; | |
117 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; | |
118 | ||
119 | return _restore_fp_context(fpregs, csr); | |
120 | } | |
121 | ||
c3fc4ab3 FBH |
122 | /* |
123 | * Helper routines | |
124 | */ | |
2db9ca0a | 125 | static int protected_save_fp_context(void __user *sc) |
faea6234 | 126 | { |
2db9ca0a PB |
127 | struct mips_abi *abi = current->thread.abi; |
128 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; | |
129 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; | |
faea6234 | 130 | int err; |
689ee856 PB |
131 | |
132 | /* | |
133 | * EVA does not have userland equivalents of ldc1 or sdc1, so | |
134 | * save to the kernel FP context & copy that to userland below. | |
135 | */ | |
136 | if (config_enabled(CONFIG_EVA)) | |
137 | lose_fpu(1); | |
138 | ||
faea6234 AN |
139 | while (1) { |
140 | lock_fpu_owner(); | |
ff3aa5f2 PB |
141 | if (is_fpu_owner()) { |
142 | err = save_fp_context(sc); | |
143 | unlock_fpu_owner(); | |
144 | } else { | |
145 | unlock_fpu_owner(); | |
146 | err = copy_fp_to_sigcontext(sc); | |
147 | } | |
faea6234 AN |
148 | if (likely(!err)) |
149 | break; | |
150 | /* touch the sigcontext and try again */ | |
2db9ca0a PB |
151 | err = __put_user(0, &fpregs[0]) | |
152 | __put_user(0, &fpregs[31]) | | |
153 | __put_user(0, csr); | |
faea6234 AN |
154 | if (err) |
155 | break; /* really bad sigcontext */ | |
156 | } | |
689ee856 | 157 | |
faea6234 AN |
158 | return err; |
159 | } | |
160 | ||
2db9ca0a | 161 | static int protected_restore_fp_context(void __user *sc) |
faea6234 | 162 | { |
2db9ca0a PB |
163 | struct mips_abi *abi = current->thread.abi; |
164 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; | |
165 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; | |
c726b822 | 166 | int err, tmp __maybe_unused; |
689ee856 PB |
167 | |
168 | /* | |
169 | * EVA does not have userland equivalents of ldc1 or sdc1, so we | |
170 | * disable the FPU here such that the code below simply copies to | |
171 | * the kernel FP context. | |
172 | */ | |
173 | if (config_enabled(CONFIG_EVA)) | |
174 | lose_fpu(0); | |
175 | ||
faea6234 AN |
176 | while (1) { |
177 | lock_fpu_owner(); | |
ff3aa5f2 PB |
178 | if (is_fpu_owner()) { |
179 | err = restore_fp_context(sc); | |
180 | unlock_fpu_owner(); | |
181 | } else { | |
182 | unlock_fpu_owner(); | |
183 | err = copy_fp_from_sigcontext(sc); | |
184 | } | |
faea6234 AN |
185 | if (likely(!err)) |
186 | break; | |
187 | /* touch the sigcontext and try again */ | |
2db9ca0a PB |
188 | err = __get_user(tmp, &fpregs[0]) | |
189 | __get_user(tmp, &fpregs[31]) | | |
190 | __get_user(tmp, csr); | |
faea6234 AN |
191 | if (err) |
192 | break; /* really bad sigcontext */ | |
193 | } | |
689ee856 | 194 | |
faea6234 AN |
195 | return err; |
196 | } | |
197 | ||
c3fc4ab3 FBH |
198 | int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
199 | { | |
200 | int err = 0; | |
201 | int i; | |
53dc8028 | 202 | unsigned int used_math; |
c3fc4ab3 FBH |
203 | |
204 | err |= __put_user(regs->cp0_epc, &sc->sc_pc); | |
205 | ||
206 | err |= __put_user(0, &sc->sc_regs[0]); | |
207 | for (i = 1; i < 32; i++) | |
208 | err |= __put_user(regs->regs[i], &sc->sc_regs[i]); | |
209 | ||
9693a853 FBH |
210 | #ifdef CONFIG_CPU_HAS_SMARTMIPS |
211 | err |= __put_user(regs->acx, &sc->sc_acx); | |
212 | #endif | |
c3fc4ab3 FBH |
213 | err |= __put_user(regs->hi, &sc->sc_mdhi); |
214 | err |= __put_user(regs->lo, &sc->sc_mdlo); | |
215 | if (cpu_has_dsp) { | |
216 | err |= __put_user(mfhi1(), &sc->sc_hi1); | |
217 | err |= __put_user(mflo1(), &sc->sc_lo1); | |
218 | err |= __put_user(mfhi2(), &sc->sc_hi2); | |
219 | err |= __put_user(mflo2(), &sc->sc_lo2); | |
220 | err |= __put_user(mfhi3(), &sc->sc_hi3); | |
221 | err |= __put_user(mflo3(), &sc->sc_lo3); | |
222 | err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); | |
223 | } | |
224 | ||
16f77de8 | 225 | used_math = !!used_math(); |
53dc8028 | 226 | err |= __put_user(used_math, &sc->sc_used_math); |
c3fc4ab3 | 227 | |
53dc8028 | 228 | if (used_math) { |
c3fc4ab3 FBH |
229 | /* |
230 | * Save FPU state to signal context. Signal handler | |
231 | * will "inherit" current FPU state. | |
232 | */ | |
16f77de8 | 233 | err |= protected_save_fp_context(sc); |
c3fc4ab3 FBH |
234 | } |
235 | return err; | |
236 | } | |
237 | ||
c6a2f467 AN |
238 | int fpcsr_pending(unsigned int __user *fpcsr) |
239 | { | |
240 | int err, sig = 0; | |
241 | unsigned int csr, enabled; | |
242 | ||
243 | err = __get_user(csr, fpcsr); | |
244 | enabled = FPU_CSR_UNI_X | ((csr & FPU_CSR_ALL_E) << 5); | |
245 | /* | |
246 | * If the signal handler set some FPU exceptions, clear it and | |
247 | * send SIGFPE. | |
248 | */ | |
249 | if (csr & enabled) { | |
250 | csr &= ~enabled; | |
251 | err |= __put_user(csr, fpcsr); | |
252 | sig = SIGFPE; | |
253 | } | |
254 | return err ?: sig; | |
255 | } | |
256 | ||
257 | static int | |
2db9ca0a | 258 | check_and_restore_fp_context(void __user *sc) |
c6a2f467 | 259 | { |
2db9ca0a | 260 | struct mips_abi *abi = current->thread.abi; |
c6a2f467 AN |
261 | int err, sig; |
262 | ||
2db9ca0a | 263 | err = sig = fpcsr_pending(sc + abi->off_sc_fpc_csr); |
c6a2f467 AN |
264 | if (err > 0) |
265 | err = 0; | |
16f77de8 | 266 | err |= protected_restore_fp_context(sc); |
c6a2f467 AN |
267 | return err ?: sig; |
268 | } | |
269 | ||
c3fc4ab3 FBH |
270 | int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
271 | { | |
272 | unsigned int used_math; | |
273 | unsigned long treg; | |
274 | int err = 0; | |
275 | int i; | |
276 | ||
277 | /* Always make any pending restarted system calls return -EINTR */ | |
f56141e3 | 278 | current->restart_block.fn = do_no_restart_syscall; |
c3fc4ab3 FBH |
279 | |
280 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); | |
9693a853 FBH |
281 | |
282 | #ifdef CONFIG_CPU_HAS_SMARTMIPS | |
283 | err |= __get_user(regs->acx, &sc->sc_acx); | |
284 | #endif | |
c3fc4ab3 FBH |
285 | err |= __get_user(regs->hi, &sc->sc_mdhi); |
286 | err |= __get_user(regs->lo, &sc->sc_mdlo); | |
287 | if (cpu_has_dsp) { | |
288 | err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); | |
289 | err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); | |
290 | err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); | |
291 | err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); | |
292 | err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); | |
293 | err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); | |
294 | err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); | |
295 | } | |
296 | ||
297 | for (i = 1; i < 32; i++) | |
298 | err |= __get_user(regs->regs[i], &sc->sc_regs[i]); | |
299 | ||
300 | err |= __get_user(used_math, &sc->sc_used_math); | |
301 | conditional_used_math(used_math); | |
302 | ||
53dc8028 | 303 | if (used_math) { |
c3fc4ab3 | 304 | /* restore fpu context if we have used it before */ |
c6a2f467 | 305 | if (!err) |
16f77de8 | 306 | err = check_and_restore_fp_context(sc); |
c3fc4ab3 | 307 | } else { |
16f77de8 | 308 | /* signal handler may have used FPU. Give it up. */ |
53dc8028 | 309 | lose_fpu(0); |
c3fc4ab3 FBH |
310 | } |
311 | ||
c3fc4ab3 FBH |
312 | return err; |
313 | } | |
314 | ||
7c4f5635 | 315 | void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, |
c3fc4ab3 FBH |
316 | size_t frame_size) |
317 | { | |
318 | unsigned long sp; | |
319 | ||
320 | /* Default to using normal stack */ | |
321 | sp = regs->regs[29]; | |
322 | ||
323 | /* | |
324 | * FPU emulator may have it's own trampoline active just | |
325 | * above the user stack, 16-bytes before the next lowest | |
326 | * 16 byte boundary. Try to avoid trashing it. | |
327 | */ | |
328 | sp -= 32; | |
329 | ||
7c4f5635 | 330 | sp = sigsp(sp, ksig); |
c3fc4ab3 FBH |
331 | |
332 | return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK)); | |
333 | } | |
334 | ||
1da177e4 LT |
335 | /* |
336 | * Atomically swap in the new signal mask, and wait for a signal. | |
337 | */ | |
338 | ||
339 | #ifdef CONFIG_TRAD_SIGNALS | |
1910f4ab | 340 | SYSCALL_DEFINE1(sigsuspend, sigset_t __user *, uset) |
1da177e4 | 341 | { |
1910f4ab | 342 | return sys_rt_sigsuspend(uset, sizeof(sigset_t)); |
1da177e4 LT |
343 | } |
344 | #endif | |
345 | ||
1da177e4 | 346 | #ifdef CONFIG_TRAD_SIGNALS |
dbda6ac0 RB |
347 | SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act, |
348 | struct sigaction __user *, oact) | |
1da177e4 LT |
349 | { |
350 | struct k_sigaction new_ka, old_ka; | |
351 | int ret; | |
352 | int err = 0; | |
353 | ||
354 | if (act) { | |
355 | old_sigset_t mask; | |
356 | ||
357 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
358 | return -EFAULT; | |
359 | err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler); | |
360 | err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
361 | err |= __get_user(mask, &act->sa_mask.sig[0]); | |
362 | if (err) | |
363 | return -EFAULT; | |
364 | ||
365 | siginitset(&new_ka.sa.sa_mask, mask); | |
366 | } | |
367 | ||
368 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
369 | ||
370 | if (!ret && oact) { | |
371 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
e0daad44 | 372 | return -EFAULT; |
1da177e4 LT |
373 | err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
374 | err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler); | |
375 | err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); | |
376 | err |= __put_user(0, &oact->sa_mask.sig[1]); | |
377 | err |= __put_user(0, &oact->sa_mask.sig[2]); | |
378 | err |= __put_user(0, &oact->sa_mask.sig[3]); | |
379 | if (err) | |
380 | return -EFAULT; | |
381 | } | |
382 | ||
383 | return ret; | |
384 | } | |
385 | #endif | |
386 | ||
1da177e4 | 387 | #ifdef CONFIG_TRAD_SIGNALS |
f90080a0 | 388 | asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 389 | { |
9bbf28a3 | 390 | struct sigframe __user *frame; |
1da177e4 | 391 | sigset_t blocked; |
c6a2f467 | 392 | int sig; |
1da177e4 | 393 | |
9bbf28a3 | 394 | frame = (struct sigframe __user *) regs.regs[29]; |
1da177e4 LT |
395 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
396 | goto badframe; | |
397 | if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked))) | |
398 | goto badframe; | |
399 | ||
8598f3cd | 400 | set_current_blocked(&blocked); |
1da177e4 | 401 | |
c6a2f467 AN |
402 | sig = restore_sigcontext(®s, &frame->sf_sc); |
403 | if (sig < 0) | |
1da177e4 | 404 | goto badframe; |
c6a2f467 AN |
405 | else if (sig) |
406 | force_sig(sig, current); | |
1da177e4 LT |
407 | |
408 | /* | |
409 | * Don't let your children do this ... | |
410 | */ | |
1da177e4 LT |
411 | __asm__ __volatile__( |
412 | "move\t$29, %0\n\t" | |
413 | "j\tsyscall_exit" | |
414 | :/* no outputs */ | |
415 | :"r" (®s)); | |
416 | /* Unreached */ | |
417 | ||
418 | badframe: | |
419 | force_sig(SIGSEGV, current); | |
420 | } | |
e50c0a8f | 421 | #endif /* CONFIG_TRAD_SIGNALS */ |
1da177e4 | 422 | |
f90080a0 | 423 | asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 424 | { |
9bbf28a3 | 425 | struct rt_sigframe __user *frame; |
1da177e4 | 426 | sigset_t set; |
c6a2f467 | 427 | int sig; |
1da177e4 | 428 | |
9bbf28a3 | 429 | frame = (struct rt_sigframe __user *) regs.regs[29]; |
1da177e4 LT |
430 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
431 | goto badframe; | |
432 | if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) | |
433 | goto badframe; | |
434 | ||
8598f3cd | 435 | set_current_blocked(&set); |
1da177e4 | 436 | |
c6a2f467 AN |
437 | sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext); |
438 | if (sig < 0) | |
1da177e4 | 439 | goto badframe; |
c6a2f467 AN |
440 | else if (sig) |
441 | force_sig(sig, current); | |
1da177e4 | 442 | |
ea536ad4 AV |
443 | if (restore_altstack(&frame->rs_uc.uc_stack)) |
444 | goto badframe; | |
1da177e4 LT |
445 | |
446 | /* | |
447 | * Don't let your children do this ... | |
448 | */ | |
449 | __asm__ __volatile__( | |
450 | "move\t$29, %0\n\t" | |
451 | "j\tsyscall_exit" | |
452 | :/* no outputs */ | |
453 | :"r" (®s)); | |
454 | /* Unreached */ | |
455 | ||
456 | badframe: | |
457 | force_sig(SIGSEGV, current); | |
458 | } | |
459 | ||
460 | #ifdef CONFIG_TRAD_SIGNALS | |
81d103bf RW |
461 | static int setup_frame(void *sig_return, struct ksignal *ksig, |
462 | struct pt_regs *regs, sigset_t *set) | |
1da177e4 | 463 | { |
9bbf28a3 | 464 | struct sigframe __user *frame; |
1da177e4 LT |
465 | int err = 0; |
466 | ||
7c4f5635 | 467 | frame = get_sigframe(ksig, regs, sizeof(*frame)); |
1da177e4 | 468 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) |
81d103bf | 469 | return -EFAULT; |
1da177e4 | 470 | |
1da177e4 LT |
471 | err |= setup_sigcontext(regs, &frame->sf_sc); |
472 | err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set)); | |
473 | if (err) | |
81d103bf | 474 | return -EFAULT; |
1da177e4 LT |
475 | |
476 | /* | |
477 | * Arguments to signal handler: | |
478 | * | |
479 | * a0 = signal number | |
480 | * a1 = 0 (should be cause) | |
481 | * a2 = pointer to struct sigcontext | |
482 | * | |
483 | * $25 and c0_epc point to the signal handler, $29 points to the | |
484 | * struct sigframe. | |
485 | */ | |
81d103bf | 486 | regs->regs[ 4] = ksig->sig; |
1da177e4 LT |
487 | regs->regs[ 5] = 0; |
488 | regs->regs[ 6] = (unsigned long) &frame->sf_sc; | |
489 | regs->regs[29] = (unsigned long) frame; | |
d814c28c | 490 | regs->regs[31] = (unsigned long) sig_return; |
81d103bf | 491 | regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 | 492 | |
722bb63d | 493 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 | 494 | current->comm, current->pid, |
722bb63d | 495 | frame, regs->cp0_epc, regs->regs[31]); |
e0daad44 | 496 | return 0; |
1da177e4 LT |
497 | } |
498 | #endif | |
499 | ||
81d103bf RW |
500 | static int setup_rt_frame(void *sig_return, struct ksignal *ksig, |
501 | struct pt_regs *regs, sigset_t *set) | |
1da177e4 | 502 | { |
9bbf28a3 | 503 | struct rt_sigframe __user *frame; |
1da177e4 LT |
504 | int err = 0; |
505 | ||
7c4f5635 | 506 | frame = get_sigframe(ksig, regs, sizeof(*frame)); |
1da177e4 | 507 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) |
81d103bf | 508 | return -EFAULT; |
1da177e4 | 509 | |
1da177e4 | 510 | /* Create siginfo. */ |
81d103bf | 511 | err |= copy_siginfo_to_user(&frame->rs_info, &ksig->info); |
1da177e4 | 512 | |
70342287 | 513 | /* Create the ucontext. */ |
1da177e4 | 514 | err |= __put_user(0, &frame->rs_uc.uc_flags); |
5665a0ac | 515 | err |= __put_user(NULL, &frame->rs_uc.uc_link); |
ea536ad4 | 516 | err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]); |
1da177e4 LT |
517 | err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); |
518 | err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); | |
519 | ||
520 | if (err) | |
81d103bf | 521 | return -EFAULT; |
1da177e4 LT |
522 | |
523 | /* | |
524 | * Arguments to signal handler: | |
525 | * | |
526 | * a0 = signal number | |
527 | * a1 = 0 (should be cause) | |
528 | * a2 = pointer to ucontext | |
529 | * | |
530 | * $25 and c0_epc point to the signal handler, $29 points to | |
531 | * the struct rt_sigframe. | |
532 | */ | |
81d103bf | 533 | regs->regs[ 4] = ksig->sig; |
1da177e4 LT |
534 | regs->regs[ 5] = (unsigned long) &frame->rs_info; |
535 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
536 | regs->regs[29] = (unsigned long) frame; | |
d814c28c | 537 | regs->regs[31] = (unsigned long) sig_return; |
81d103bf | 538 | regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 | 539 | |
722bb63d | 540 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 LT |
541 | current->comm, current->pid, |
542 | frame, regs->cp0_epc, regs->regs[31]); | |
722bb63d | 543 | |
7b3e2fc8 | 544 | return 0; |
1da177e4 LT |
545 | } |
546 | ||
151fd6ac RB |
547 | struct mips_abi mips_abi = { |
548 | #ifdef CONFIG_TRAD_SIGNALS | |
549 | .setup_frame = setup_frame, | |
d814c28c | 550 | .signal_return_offset = offsetof(struct mips_vdso, signal_trampoline), |
151fd6ac | 551 | #endif |
70342287 | 552 | .setup_rt_frame = setup_rt_frame, |
d814c28c DD |
553 | .rt_signal_return_offset = |
554 | offsetof(struct mips_vdso, rt_signal_trampoline), | |
77856100 PB |
555 | .restart = __NR_restart_syscall, |
556 | ||
557 | .off_sc_fpregs = offsetof(struct sigcontext, sc_fpregs), | |
558 | .off_sc_fpc_csr = offsetof(struct sigcontext, sc_fpc_csr), | |
559 | .off_sc_used_math = offsetof(struct sigcontext, sc_used_math), | |
151fd6ac RB |
560 | }; |
561 | ||
81d103bf | 562 | static void handle_signal(struct ksignal *ksig, struct pt_regs *regs) |
1da177e4 | 563 | { |
b7f9a11a | 564 | sigset_t *oldset = sigmask_to_save(); |
129bc8f7 | 565 | int ret; |
d814c28c | 566 | struct mips_abi *abi = current->thread.abi; |
01be057b DL |
567 | #ifdef CONFIG_CPU_MICROMIPS |
568 | void *vdso; | |
2fabc7d2 | 569 | unsigned long tmp = (unsigned long)current->mm->context.vdso; |
01be057b DL |
570 | |
571 | set_isa16_mode(tmp); | |
572 | vdso = (void *)tmp; | |
573 | #else | |
d814c28c | 574 | void *vdso = current->mm->context.vdso; |
01be057b | 575 | #endif |
129bc8f7 | 576 | |
8f5a00eb AV |
577 | if (regs->regs[0]) { |
578 | switch(regs->regs[2]) { | |
579 | case ERESTART_RESTARTBLOCK: | |
580 | case ERESTARTNOHAND: | |
1da177e4 LT |
581 | regs->regs[2] = EINTR; |
582 | break; | |
8f5a00eb | 583 | case ERESTARTSYS: |
81d103bf | 584 | if (!(ksig->ka.sa.sa_flags & SA_RESTART)) { |
8f5a00eb AV |
585 | regs->regs[2] = EINTR; |
586 | break; | |
587 | } | |
588 | /* fallthrough */ | |
589 | case ERESTARTNOINTR: | |
590 | regs->regs[7] = regs->regs[26]; | |
591 | regs->regs[2] = regs->regs[0]; | |
592 | regs->cp0_epc -= 4; | |
1da177e4 | 593 | } |
1da177e4 | 594 | |
70342287 | 595 | regs->regs[0] = 0; /* Don't deal with this again. */ |
8f5a00eb | 596 | } |
1da177e4 | 597 | |
81d103bf | 598 | if (sig_uses_siginfo(&ksig->ka)) |
d814c28c | 599 | ret = abi->setup_rt_frame(vdso + abi->rt_signal_return_offset, |
81d103bf | 600 | ksig, regs, oldset); |
1da177e4 | 601 | else |
81d103bf RW |
602 | ret = abi->setup_frame(vdso + abi->signal_return_offset, ksig, |
603 | regs, oldset); | |
062ab57b | 604 | |
81d103bf | 605 | signal_setup_done(ret, ksig, 0); |
1da177e4 LT |
606 | } |
607 | ||
151fd6ac | 608 | static void do_signal(struct pt_regs *regs) |
1da177e4 | 609 | { |
81d103bf | 610 | struct ksignal ksig; |
1da177e4 | 611 | |
81d103bf | 612 | if (get_signal(&ksig)) { |
70342287 | 613 | /* Whee! Actually deliver the signal. */ |
81d103bf | 614 | handle_signal(&ksig, regs); |
45887e12 | 615 | return; |
7b3e2fc8 | 616 | } |
1da177e4 | 617 | |
1da177e4 | 618 | if (regs->regs[0]) { |
9ec9b5ac RB |
619 | switch (regs->regs[2]) { |
620 | case ERESTARTNOHAND: | |
621 | case ERESTARTSYS: | |
622 | case ERESTARTNOINTR: | |
8f5a00eb | 623 | regs->regs[2] = regs->regs[0]; |
1da177e4 | 624 | regs->regs[7] = regs->regs[26]; |
8f5a00eb | 625 | regs->cp0_epc -= 4; |
9ec9b5ac RB |
626 | break; |
627 | ||
628 | case ERESTART_RESTARTBLOCK: | |
151fd6ac | 629 | regs->regs[2] = current->thread.abi->restart; |
1da177e4 LT |
630 | regs->regs[7] = regs->regs[26]; |
631 | regs->cp0_epc -= 4; | |
9ec9b5ac | 632 | break; |
1da177e4 | 633 | } |
70342287 | 634 | regs->regs[0] = 0; /* Don't deal with this again. */ |
1da177e4 | 635 | } |
7b3e2fc8 RB |
636 | |
637 | /* | |
638 | * If there's no signal to deliver, we just put the saved sigmask | |
639 | * back | |
640 | */ | |
51a7b448 | 641 | restore_saved_sigmask(); |
1da177e4 LT |
642 | } |
643 | ||
644 | /* | |
645 | * notification of userspace execution resumption | |
7b3e2fc8 | 646 | * - triggered by the TIF_WORK_MASK flags |
1da177e4 | 647 | */ |
7b3e2fc8 | 648 | asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, |
1da177e4 LT |
649 | __u32 thread_info_flags) |
650 | { | |
1f717929 RB |
651 | local_irq_enable(); |
652 | ||
c3fc5cd5 RB |
653 | user_exit(); |
654 | ||
1da177e4 | 655 | /* deal with pending signal delivery */ |
6fd84c08 | 656 | if (thread_info_flags & _TIF_SIGPENDING) |
151fd6ac | 657 | do_signal(regs); |
d0420c83 DH |
658 | |
659 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { | |
660 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
661 | tracehook_notify_resume(regs); | |
662 | } | |
c3fc5cd5 RB |
663 | |
664 | user_enter(); | |
1da177e4 | 665 | } |
137f6f3e RB |
666 | |
667 | #ifdef CONFIG_SMP | |
2db9ca0a | 668 | static int smp_save_fp_context(void __user *sc) |
137f6f3e RB |
669 | { |
670 | return raw_cpu_has_fpu | |
2db9ca0a | 671 | ? save_hw_fp_context(sc) |
b2ead528 | 672 | : copy_fp_to_sigcontext(sc); |
137f6f3e RB |
673 | } |
674 | ||
2db9ca0a | 675 | static int smp_restore_fp_context(void __user *sc) |
137f6f3e RB |
676 | { |
677 | return raw_cpu_has_fpu | |
2db9ca0a | 678 | ? restore_hw_fp_context(sc) |
b2ead528 | 679 | : copy_fp_from_sigcontext(sc); |
137f6f3e RB |
680 | } |
681 | #endif | |
682 | ||
683 | static int signal_setup(void) | |
684 | { | |
685 | #ifdef CONFIG_SMP | |
686 | /* For now just do the cpu_has_fpu check when the functions are invoked */ | |
687 | save_fp_context = smp_save_fp_context; | |
688 | restore_fp_context = smp_restore_fp_context; | |
689 | #else | |
690 | if (cpu_has_fpu) { | |
2db9ca0a PB |
691 | save_fp_context = save_hw_fp_context; |
692 | restore_fp_context = restore_hw_fp_context; | |
137f6f3e | 693 | } else { |
14fa12df PB |
694 | save_fp_context = copy_fp_to_sigcontext; |
695 | restore_fp_context = copy_fp_from_sigcontext; | |
137f6f3e | 696 | } |
ca750649 | 697 | #endif /* CONFIG_SMP */ |
137f6f3e RB |
698 | |
699 | return 0; | |
700 | } | |
701 | ||
702 | arch_initcall(signal_setup); |