Commit | Line | Data |
---|---|---|
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 | */ | |
d02a40af | 127 | 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 | |
0d071fa3 PB |
136 | used = used_math() ? USED_FP : 0; |
137 | if (used) { | |
138 | if (!test_thread_flag(TIF_32BIT_FPREGS)) | |
139 | used |= USED_FR1; | |
140 | if (test_thread_flag(TIF_HYBRID_FPREGS)) | |
141 | used |= USED_HYBRID_FPRS; | |
142 | } | |
143 | ||
64243c2a | 144 | err = __put_user(used, used_math); |
0d071fa3 | 145 | if (err || !(used & USED_FP)) |
64243c2a PB |
146 | return err; |
147 | ||
689ee856 PB |
148 | /* |
149 | * EVA does not have userland equivalents of ldc1 or sdc1, so | |
150 | * save to the kernel FP context & copy that to userland below. | |
151 | */ | |
152 | if (config_enabled(CONFIG_EVA)) | |
153 | lose_fpu(1); | |
154 | ||
faea6234 AN |
155 | while (1) { |
156 | lock_fpu_owner(); | |
ff3aa5f2 PB |
157 | if (is_fpu_owner()) { |
158 | err = save_fp_context(sc); | |
159 | unlock_fpu_owner(); | |
160 | } else { | |
161 | unlock_fpu_owner(); | |
162 | err = copy_fp_to_sigcontext(sc); | |
163 | } | |
faea6234 AN |
164 | if (likely(!err)) |
165 | break; | |
166 | /* touch the sigcontext and try again */ | |
2db9ca0a PB |
167 | err = __put_user(0, &fpregs[0]) | |
168 | __put_user(0, &fpregs[31]) | | |
169 | __put_user(0, csr); | |
faea6234 AN |
170 | if (err) |
171 | break; /* really bad sigcontext */ | |
172 | } | |
689ee856 | 173 | |
faea6234 AN |
174 | return err; |
175 | } | |
176 | ||
d02a40af | 177 | int protected_restore_fp_context(void __user *sc) |
faea6234 | 178 | { |
2db9ca0a PB |
179 | struct mips_abi *abi = current->thread.abi; |
180 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; | |
181 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; | |
64243c2a PB |
182 | uint32_t __user *used_math = sc + abi->off_sc_used_math; |
183 | unsigned int used; | |
184 | int err, sig, tmp __maybe_unused; | |
185 | ||
186 | err = __get_user(used, used_math); | |
0d071fa3 | 187 | conditional_used_math(used & USED_FP); |
64243c2a PB |
188 | |
189 | /* | |
190 | * The signal handler may have used FPU; give it up if the program | |
191 | * doesn't want it following sigreturn. | |
192 | */ | |
0d071fa3 | 193 | if (err || !(used & USED_FP)) { |
64243c2a PB |
194 | lose_fpu(0); |
195 | return err; | |
196 | } | |
197 | ||
198 | err = sig = fpcsr_pending(csr); | |
199 | if (err < 0) | |
200 | return err; | |
689ee856 PB |
201 | |
202 | /* | |
203 | * EVA does not have userland equivalents of ldc1 or sdc1, so we | |
204 | * disable the FPU here such that the code below simply copies to | |
205 | * the kernel FP context. | |
206 | */ | |
207 | if (config_enabled(CONFIG_EVA)) | |
208 | lose_fpu(0); | |
209 | ||
faea6234 AN |
210 | while (1) { |
211 | lock_fpu_owner(); | |
ff3aa5f2 PB |
212 | if (is_fpu_owner()) { |
213 | err = restore_fp_context(sc); | |
214 | unlock_fpu_owner(); | |
215 | } else { | |
216 | unlock_fpu_owner(); | |
217 | err = copy_fp_from_sigcontext(sc); | |
218 | } | |
faea6234 AN |
219 | if (likely(!err)) |
220 | break; | |
221 | /* touch the sigcontext and try again */ | |
2db9ca0a PB |
222 | err = __get_user(tmp, &fpregs[0]) | |
223 | __get_user(tmp, &fpregs[31]) | | |
224 | __get_user(tmp, csr); | |
faea6234 AN |
225 | if (err) |
226 | break; /* really bad sigcontext */ | |
227 | } | |
689ee856 | 228 | |
64243c2a | 229 | return err ?: sig; |
faea6234 AN |
230 | } |
231 | ||
c3fc4ab3 FBH |
232 | int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
233 | { | |
234 | int err = 0; | |
235 | int i; | |
236 | ||
237 | err |= __put_user(regs->cp0_epc, &sc->sc_pc); | |
238 | ||
239 | err |= __put_user(0, &sc->sc_regs[0]); | |
240 | for (i = 1; i < 32; i++) | |
241 | err |= __put_user(regs->regs[i], &sc->sc_regs[i]); | |
242 | ||
9693a853 FBH |
243 | #ifdef CONFIG_CPU_HAS_SMARTMIPS |
244 | err |= __put_user(regs->acx, &sc->sc_acx); | |
245 | #endif | |
c3fc4ab3 FBH |
246 | err |= __put_user(regs->hi, &sc->sc_mdhi); |
247 | err |= __put_user(regs->lo, &sc->sc_mdlo); | |
248 | if (cpu_has_dsp) { | |
249 | err |= __put_user(mfhi1(), &sc->sc_hi1); | |
250 | err |= __put_user(mflo1(), &sc->sc_lo1); | |
251 | err |= __put_user(mfhi2(), &sc->sc_hi2); | |
252 | err |= __put_user(mflo2(), &sc->sc_lo2); | |
253 | err |= __put_user(mfhi3(), &sc->sc_hi3); | |
254 | err |= __put_user(mflo3(), &sc->sc_lo3); | |
255 | err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); | |
256 | } | |
257 | ||
c3fc4ab3 | 258 | |
64243c2a PB |
259 | /* |
260 | * Save FPU state to signal context. Signal handler | |
261 | * will "inherit" current FPU state. | |
262 | */ | |
263 | err |= protected_save_fp_context(sc); | |
264 | ||
c3fc4ab3 FBH |
265 | return err; |
266 | } | |
267 | ||
c6a2f467 AN |
268 | int fpcsr_pending(unsigned int __user *fpcsr) |
269 | { | |
270 | int err, sig = 0; | |
271 | unsigned int csr, enabled; | |
272 | ||
273 | err = __get_user(csr, fpcsr); | |
274 | enabled = FPU_CSR_UNI_X | ((csr & FPU_CSR_ALL_E) << 5); | |
275 | /* | |
276 | * If the signal handler set some FPU exceptions, clear it and | |
277 | * send SIGFPE. | |
278 | */ | |
279 | if (csr & enabled) { | |
280 | csr &= ~enabled; | |
281 | err |= __put_user(csr, fpcsr); | |
282 | sig = SIGFPE; | |
283 | } | |
284 | return err ?: sig; | |
285 | } | |
286 | ||
c3fc4ab3 FBH |
287 | int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
288 | { | |
c3fc4ab3 FBH |
289 | unsigned long treg; |
290 | int err = 0; | |
291 | int i; | |
292 | ||
293 | /* Always make any pending restarted system calls return -EINTR */ | |
f56141e3 | 294 | current->restart_block.fn = do_no_restart_syscall; |
c3fc4ab3 FBH |
295 | |
296 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); | |
9693a853 FBH |
297 | |
298 | #ifdef CONFIG_CPU_HAS_SMARTMIPS | |
299 | err |= __get_user(regs->acx, &sc->sc_acx); | |
300 | #endif | |
c3fc4ab3 FBH |
301 | err |= __get_user(regs->hi, &sc->sc_mdhi); |
302 | err |= __get_user(regs->lo, &sc->sc_mdlo); | |
303 | if (cpu_has_dsp) { | |
304 | err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); | |
305 | err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); | |
306 | err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); | |
307 | err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); | |
308 | err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); | |
309 | err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); | |
310 | err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); | |
311 | } | |
312 | ||
313 | for (i = 1; i < 32; i++) | |
314 | err |= __get_user(regs->regs[i], &sc->sc_regs[i]); | |
315 | ||
64243c2a | 316 | return err ?: protected_restore_fp_context(sc); |
c3fc4ab3 FBH |
317 | } |
318 | ||
7c4f5635 | 319 | void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, |
c3fc4ab3 FBH |
320 | size_t frame_size) |
321 | { | |
322 | unsigned long sp; | |
323 | ||
324 | /* Default to using normal stack */ | |
325 | sp = regs->regs[29]; | |
326 | ||
327 | /* | |
328 | * FPU emulator may have it's own trampoline active just | |
329 | * above the user stack, 16-bytes before the next lowest | |
330 | * 16 byte boundary. Try to avoid trashing it. | |
331 | */ | |
332 | sp -= 32; | |
333 | ||
7c4f5635 | 334 | sp = sigsp(sp, ksig); |
c3fc4ab3 FBH |
335 | |
336 | return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK)); | |
337 | } | |
338 | ||
1da177e4 LT |
339 | /* |
340 | * Atomically swap in the new signal mask, and wait for a signal. | |
341 | */ | |
342 | ||
343 | #ifdef CONFIG_TRAD_SIGNALS | |
1910f4ab | 344 | SYSCALL_DEFINE1(sigsuspend, sigset_t __user *, uset) |
1da177e4 | 345 | { |
1910f4ab | 346 | return sys_rt_sigsuspend(uset, sizeof(sigset_t)); |
1da177e4 LT |
347 | } |
348 | #endif | |
349 | ||
1da177e4 | 350 | #ifdef CONFIG_TRAD_SIGNALS |
dbda6ac0 RB |
351 | SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act, |
352 | struct sigaction __user *, oact) | |
1da177e4 LT |
353 | { |
354 | struct k_sigaction new_ka, old_ka; | |
355 | int ret; | |
356 | int err = 0; | |
357 | ||
358 | if (act) { | |
359 | old_sigset_t mask; | |
360 | ||
361 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
362 | return -EFAULT; | |
363 | err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler); | |
364 | err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
365 | err |= __get_user(mask, &act->sa_mask.sig[0]); | |
366 | if (err) | |
367 | return -EFAULT; | |
368 | ||
369 | siginitset(&new_ka.sa.sa_mask, mask); | |
370 | } | |
371 | ||
372 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
373 | ||
374 | if (!ret && oact) { | |
375 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
e0daad44 | 376 | return -EFAULT; |
1da177e4 LT |
377 | err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
378 | err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler); | |
379 | err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); | |
380 | err |= __put_user(0, &oact->sa_mask.sig[1]); | |
381 | err |= __put_user(0, &oact->sa_mask.sig[2]); | |
382 | err |= __put_user(0, &oact->sa_mask.sig[3]); | |
383 | if (err) | |
384 | return -EFAULT; | |
385 | } | |
386 | ||
387 | return ret; | |
388 | } | |
389 | #endif | |
390 | ||
1da177e4 | 391 | #ifdef CONFIG_TRAD_SIGNALS |
f90080a0 | 392 | asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 393 | { |
9bbf28a3 | 394 | struct sigframe __user *frame; |
1da177e4 | 395 | sigset_t blocked; |
c6a2f467 | 396 | int sig; |
1da177e4 | 397 | |
9bbf28a3 | 398 | frame = (struct sigframe __user *) regs.regs[29]; |
1da177e4 LT |
399 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
400 | goto badframe; | |
401 | if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked))) | |
402 | goto badframe; | |
403 | ||
8598f3cd | 404 | set_current_blocked(&blocked); |
1da177e4 | 405 | |
c6a2f467 AN |
406 | sig = restore_sigcontext(®s, &frame->sf_sc); |
407 | if (sig < 0) | |
1da177e4 | 408 | goto badframe; |
c6a2f467 AN |
409 | else if (sig) |
410 | force_sig(sig, current); | |
1da177e4 LT |
411 | |
412 | /* | |
413 | * Don't let your children do this ... | |
414 | */ | |
1da177e4 LT |
415 | __asm__ __volatile__( |
416 | "move\t$29, %0\n\t" | |
417 | "j\tsyscall_exit" | |
418 | :/* no outputs */ | |
419 | :"r" (®s)); | |
420 | /* Unreached */ | |
421 | ||
422 | badframe: | |
423 | force_sig(SIGSEGV, current); | |
424 | } | |
e50c0a8f | 425 | #endif /* CONFIG_TRAD_SIGNALS */ |
1da177e4 | 426 | |
f90080a0 | 427 | asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 428 | { |
9bbf28a3 | 429 | struct rt_sigframe __user *frame; |
1da177e4 | 430 | sigset_t set; |
c6a2f467 | 431 | int sig; |
1da177e4 | 432 | |
9bbf28a3 | 433 | frame = (struct rt_sigframe __user *) regs.regs[29]; |
1da177e4 LT |
434 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
435 | goto badframe; | |
436 | if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) | |
437 | goto badframe; | |
438 | ||
8598f3cd | 439 | set_current_blocked(&set); |
1da177e4 | 440 | |
c6a2f467 AN |
441 | sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext); |
442 | if (sig < 0) | |
1da177e4 | 443 | goto badframe; |
c6a2f467 AN |
444 | else if (sig) |
445 | force_sig(sig, current); | |
1da177e4 | 446 | |
ea536ad4 AV |
447 | if (restore_altstack(&frame->rs_uc.uc_stack)) |
448 | goto badframe; | |
1da177e4 LT |
449 | |
450 | /* | |
451 | * Don't let your children do this ... | |
452 | */ | |
453 | __asm__ __volatile__( | |
454 | "move\t$29, %0\n\t" | |
455 | "j\tsyscall_exit" | |
456 | :/* no outputs */ | |
457 | :"r" (®s)); | |
458 | /* Unreached */ | |
459 | ||
460 | badframe: | |
461 | force_sig(SIGSEGV, current); | |
462 | } | |
463 | ||
464 | #ifdef CONFIG_TRAD_SIGNALS | |
81d103bf RW |
465 | static int setup_frame(void *sig_return, struct ksignal *ksig, |
466 | struct pt_regs *regs, sigset_t *set) | |
1da177e4 | 467 | { |
9bbf28a3 | 468 | struct sigframe __user *frame; |
1da177e4 LT |
469 | int err = 0; |
470 | ||
7c4f5635 | 471 | frame = get_sigframe(ksig, regs, sizeof(*frame)); |
1da177e4 | 472 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) |
81d103bf | 473 | return -EFAULT; |
1da177e4 | 474 | |
1da177e4 LT |
475 | err |= setup_sigcontext(regs, &frame->sf_sc); |
476 | err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set)); | |
477 | if (err) | |
81d103bf | 478 | return -EFAULT; |
1da177e4 LT |
479 | |
480 | /* | |
481 | * Arguments to signal handler: | |
482 | * | |
483 | * a0 = signal number | |
484 | * a1 = 0 (should be cause) | |
485 | * a2 = pointer to struct sigcontext | |
486 | * | |
487 | * $25 and c0_epc point to the signal handler, $29 points to the | |
488 | * struct sigframe. | |
489 | */ | |
81d103bf | 490 | regs->regs[ 4] = ksig->sig; |
1da177e4 LT |
491 | regs->regs[ 5] = 0; |
492 | regs->regs[ 6] = (unsigned long) &frame->sf_sc; | |
493 | regs->regs[29] = (unsigned long) frame; | |
d814c28c | 494 | regs->regs[31] = (unsigned long) sig_return; |
81d103bf | 495 | regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 | 496 | |
722bb63d | 497 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 | 498 | current->comm, current->pid, |
722bb63d | 499 | frame, regs->cp0_epc, regs->regs[31]); |
e0daad44 | 500 | return 0; |
1da177e4 LT |
501 | } |
502 | #endif | |
503 | ||
81d103bf RW |
504 | static int setup_rt_frame(void *sig_return, struct ksignal *ksig, |
505 | struct pt_regs *regs, sigset_t *set) | |
1da177e4 | 506 | { |
9bbf28a3 | 507 | struct rt_sigframe __user *frame; |
1da177e4 LT |
508 | int err = 0; |
509 | ||
7c4f5635 | 510 | frame = get_sigframe(ksig, regs, sizeof(*frame)); |
1da177e4 | 511 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) |
81d103bf | 512 | return -EFAULT; |
1da177e4 | 513 | |
1da177e4 | 514 | /* Create siginfo. */ |
81d103bf | 515 | err |= copy_siginfo_to_user(&frame->rs_info, &ksig->info); |
1da177e4 | 516 | |
70342287 | 517 | /* Create the ucontext. */ |
1da177e4 | 518 | err |= __put_user(0, &frame->rs_uc.uc_flags); |
5665a0ac | 519 | err |= __put_user(NULL, &frame->rs_uc.uc_link); |
ea536ad4 | 520 | err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]); |
1da177e4 LT |
521 | err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); |
522 | err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); | |
523 | ||
524 | if (err) | |
81d103bf | 525 | return -EFAULT; |
1da177e4 LT |
526 | |
527 | /* | |
528 | * Arguments to signal handler: | |
529 | * | |
530 | * a0 = signal number | |
531 | * a1 = 0 (should be cause) | |
532 | * a2 = pointer to ucontext | |
533 | * | |
534 | * $25 and c0_epc point to the signal handler, $29 points to | |
535 | * the struct rt_sigframe. | |
536 | */ | |
81d103bf | 537 | regs->regs[ 4] = ksig->sig; |
1da177e4 LT |
538 | regs->regs[ 5] = (unsigned long) &frame->rs_info; |
539 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
540 | regs->regs[29] = (unsigned long) frame; | |
d814c28c | 541 | regs->regs[31] = (unsigned long) sig_return; |
81d103bf | 542 | regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 | 543 | |
722bb63d | 544 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 LT |
545 | current->comm, current->pid, |
546 | frame, regs->cp0_epc, regs->regs[31]); | |
722bb63d | 547 | |
7b3e2fc8 | 548 | return 0; |
1da177e4 LT |
549 | } |
550 | ||
151fd6ac RB |
551 | struct mips_abi mips_abi = { |
552 | #ifdef CONFIG_TRAD_SIGNALS | |
553 | .setup_frame = setup_frame, | |
d814c28c | 554 | .signal_return_offset = offsetof(struct mips_vdso, signal_trampoline), |
151fd6ac | 555 | #endif |
70342287 | 556 | .setup_rt_frame = setup_rt_frame, |
d814c28c DD |
557 | .rt_signal_return_offset = |
558 | offsetof(struct mips_vdso, rt_signal_trampoline), | |
77856100 PB |
559 | .restart = __NR_restart_syscall, |
560 | ||
561 | .off_sc_fpregs = offsetof(struct sigcontext, sc_fpregs), | |
562 | .off_sc_fpc_csr = offsetof(struct sigcontext, sc_fpc_csr), | |
563 | .off_sc_used_math = offsetof(struct sigcontext, sc_used_math), | |
151fd6ac RB |
564 | }; |
565 | ||
81d103bf | 566 | static void handle_signal(struct ksignal *ksig, struct pt_regs *regs) |
1da177e4 | 567 | { |
b7f9a11a | 568 | sigset_t *oldset = sigmask_to_save(); |
129bc8f7 | 569 | int ret; |
d814c28c | 570 | struct mips_abi *abi = current->thread.abi; |
01be057b DL |
571 | #ifdef CONFIG_CPU_MICROMIPS |
572 | void *vdso; | |
2fabc7d2 | 573 | unsigned long tmp = (unsigned long)current->mm->context.vdso; |
01be057b DL |
574 | |
575 | set_isa16_mode(tmp); | |
576 | vdso = (void *)tmp; | |
577 | #else | |
d814c28c | 578 | void *vdso = current->mm->context.vdso; |
01be057b | 579 | #endif |
129bc8f7 | 580 | |
8f5a00eb AV |
581 | if (regs->regs[0]) { |
582 | switch(regs->regs[2]) { | |
583 | case ERESTART_RESTARTBLOCK: | |
584 | case ERESTARTNOHAND: | |
1da177e4 LT |
585 | regs->regs[2] = EINTR; |
586 | break; | |
8f5a00eb | 587 | case ERESTARTSYS: |
81d103bf | 588 | if (!(ksig->ka.sa.sa_flags & SA_RESTART)) { |
8f5a00eb AV |
589 | regs->regs[2] = EINTR; |
590 | break; | |
591 | } | |
592 | /* fallthrough */ | |
593 | case ERESTARTNOINTR: | |
594 | regs->regs[7] = regs->regs[26]; | |
595 | regs->regs[2] = regs->regs[0]; | |
596 | regs->cp0_epc -= 4; | |
1da177e4 | 597 | } |
1da177e4 | 598 | |
70342287 | 599 | regs->regs[0] = 0; /* Don't deal with this again. */ |
8f5a00eb | 600 | } |
1da177e4 | 601 | |
81d103bf | 602 | if (sig_uses_siginfo(&ksig->ka)) |
d814c28c | 603 | ret = abi->setup_rt_frame(vdso + abi->rt_signal_return_offset, |
81d103bf | 604 | ksig, regs, oldset); |
1da177e4 | 605 | else |
81d103bf RW |
606 | ret = abi->setup_frame(vdso + abi->signal_return_offset, ksig, |
607 | regs, oldset); | |
062ab57b | 608 | |
81d103bf | 609 | signal_setup_done(ret, ksig, 0); |
1da177e4 LT |
610 | } |
611 | ||
151fd6ac | 612 | static void do_signal(struct pt_regs *regs) |
1da177e4 | 613 | { |
81d103bf | 614 | struct ksignal ksig; |
1da177e4 | 615 | |
81d103bf | 616 | if (get_signal(&ksig)) { |
70342287 | 617 | /* Whee! Actually deliver the signal. */ |
81d103bf | 618 | handle_signal(&ksig, regs); |
45887e12 | 619 | return; |
7b3e2fc8 | 620 | } |
1da177e4 | 621 | |
1da177e4 | 622 | if (regs->regs[0]) { |
9ec9b5ac RB |
623 | switch (regs->regs[2]) { |
624 | case ERESTARTNOHAND: | |
625 | case ERESTARTSYS: | |
626 | case ERESTARTNOINTR: | |
8f5a00eb | 627 | regs->regs[2] = regs->regs[0]; |
1da177e4 | 628 | regs->regs[7] = regs->regs[26]; |
8f5a00eb | 629 | regs->cp0_epc -= 4; |
9ec9b5ac RB |
630 | break; |
631 | ||
632 | case ERESTART_RESTARTBLOCK: | |
151fd6ac | 633 | regs->regs[2] = current->thread.abi->restart; |
1da177e4 LT |
634 | regs->regs[7] = regs->regs[26]; |
635 | regs->cp0_epc -= 4; | |
9ec9b5ac | 636 | break; |
1da177e4 | 637 | } |
70342287 | 638 | regs->regs[0] = 0; /* Don't deal with this again. */ |
1da177e4 | 639 | } |
7b3e2fc8 RB |
640 | |
641 | /* | |
642 | * If there's no signal to deliver, we just put the saved sigmask | |
643 | * back | |
644 | */ | |
51a7b448 | 645 | restore_saved_sigmask(); |
1da177e4 LT |
646 | } |
647 | ||
648 | /* | |
649 | * notification of userspace execution resumption | |
7b3e2fc8 | 650 | * - triggered by the TIF_WORK_MASK flags |
1da177e4 | 651 | */ |
7b3e2fc8 | 652 | asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, |
1da177e4 LT |
653 | __u32 thread_info_flags) |
654 | { | |
1f717929 RB |
655 | local_irq_enable(); |
656 | ||
c3fc5cd5 RB |
657 | user_exit(); |
658 | ||
1da177e4 | 659 | /* deal with pending signal delivery */ |
6fd84c08 | 660 | if (thread_info_flags & _TIF_SIGPENDING) |
151fd6ac | 661 | do_signal(regs); |
d0420c83 DH |
662 | |
663 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { | |
664 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
665 | tracehook_notify_resume(regs); | |
666 | } | |
c3fc5cd5 RB |
667 | |
668 | user_enter(); | |
1da177e4 | 669 | } |
137f6f3e RB |
670 | |
671 | #ifdef CONFIG_SMP | |
2db9ca0a | 672 | static int smp_save_fp_context(void __user *sc) |
137f6f3e RB |
673 | { |
674 | return raw_cpu_has_fpu | |
2db9ca0a | 675 | ? save_hw_fp_context(sc) |
b2ead528 | 676 | : copy_fp_to_sigcontext(sc); |
137f6f3e RB |
677 | } |
678 | ||
2db9ca0a | 679 | static int smp_restore_fp_context(void __user *sc) |
137f6f3e RB |
680 | { |
681 | return raw_cpu_has_fpu | |
2db9ca0a | 682 | ? restore_hw_fp_context(sc) |
b2ead528 | 683 | : copy_fp_from_sigcontext(sc); |
137f6f3e RB |
684 | } |
685 | #endif | |
686 | ||
687 | static int signal_setup(void) | |
688 | { | |
689 | #ifdef CONFIG_SMP | |
690 | /* For now just do the cpu_has_fpu check when the functions are invoked */ | |
691 | save_fp_context = smp_save_fp_context; | |
692 | restore_fp_context = smp_restore_fp_context; | |
693 | #else | |
694 | if (cpu_has_fpu) { | |
2db9ca0a PB |
695 | save_fp_context = save_hw_fp_context; |
696 | restore_fp_context = restore_hw_fp_context; | |
137f6f3e | 697 | } else { |
14fa12df PB |
698 | save_fp_context = copy_fp_to_sigcontext; |
699 | restore_fp_context = copy_fp_from_sigcontext; | |
137f6f3e | 700 | } |
ca750649 | 701 | #endif /* CONFIG_SMP */ |
137f6f3e RB |
702 | |
703 | return 0; | |
704 | } | |
705 | ||
706 | arch_initcall(signal_setup); |