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 */ |
f1fe2d21 PB |
50 | |
51 | /* Matches struct ucontext from its uc_mcontext field onwards */ | |
66680583 RB |
52 | struct sigcontext sf_sc; |
53 | sigset_t sf_mask; | |
f1fe2d21 | 54 | unsigned long long sf_extcontext[0]; |
66680583 RB |
55 | }; |
56 | ||
c0b9bae9 FBH |
57 | struct rt_sigframe { |
58 | u32 rs_ass[4]; /* argument save space for o32 */ | |
d814c28c | 59 | u32 rs_pad[2]; /* Was: signal trampoline */ |
c0b9bae9 FBH |
60 | struct siginfo rs_info; |
61 | struct ucontext rs_uc; | |
62 | }; | |
63 | ||
b2ead528 PB |
64 | /* |
65 | * Thread saved context copy to/from a signal context presumed to be on the | |
66 | * user stack, and therefore accessed with appropriate macros from uaccess.h. | |
67 | */ | |
2db9ca0a | 68 | static int copy_fp_to_sigcontext(void __user *sc) |
b2ead528 | 69 | { |
2db9ca0a PB |
70 | struct mips_abi *abi = current->thread.abi; |
71 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; | |
72 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; | |
b2ead528 PB |
73 | int i; |
74 | int err = 0; | |
6f0aba63 | 75 | int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1; |
b2ead528 | 76 | |
6f0aba63 | 77 | for (i = 0; i < NUM_FPU_REGS; i += inc) { |
b2ead528 PB |
78 | err |= |
79 | __put_user(get_fpr64(¤t->thread.fpu.fpr[i], 0), | |
2db9ca0a | 80 | &fpregs[i]); |
b2ead528 | 81 | } |
2db9ca0a | 82 | err |= __put_user(current->thread.fpu.fcr31, csr); |
b2ead528 PB |
83 | |
84 | return err; | |
85 | } | |
86 | ||
2db9ca0a | 87 | static int copy_fp_from_sigcontext(void __user *sc) |
b2ead528 | 88 | { |
2db9ca0a PB |
89 | struct mips_abi *abi = current->thread.abi; |
90 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; | |
91 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; | |
b2ead528 PB |
92 | int i; |
93 | int err = 0; | |
6f0aba63 | 94 | int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1; |
b2ead528 PB |
95 | u64 fpr_val; |
96 | ||
6f0aba63 | 97 | for (i = 0; i < NUM_FPU_REGS; i += inc) { |
2db9ca0a | 98 | err |= __get_user(fpr_val, &fpregs[i]); |
b2ead528 PB |
99 | set_fpr64(¤t->thread.fpu.fpr[i], 0, fpr_val); |
100 | } | |
2db9ca0a | 101 | err |= __get_user(current->thread.fpu.fcr31, csr); |
b2ead528 PB |
102 | |
103 | return err; | |
104 | } | |
105 | ||
2db9ca0a PB |
106 | /* |
107 | * Wrappers for the assembly _{save,restore}_fp_context functions. | |
108 | */ | |
109 | static int save_hw_fp_context(void __user *sc) | |
110 | { | |
111 | struct mips_abi *abi = current->thread.abi; | |
112 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; | |
113 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; | |
114 | ||
115 | return _save_fp_context(fpregs, csr); | |
116 | } | |
117 | ||
118 | static int restore_hw_fp_context(void __user *sc) | |
119 | { | |
120 | struct mips_abi *abi = current->thread.abi; | |
121 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; | |
122 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; | |
123 | ||
124 | return _restore_fp_context(fpregs, csr); | |
125 | } | |
126 | ||
c3fc4ab3 FBH |
127 | /* |
128 | * Helper routines | |
129 | */ | |
d02a40af | 130 | int protected_save_fp_context(void __user *sc) |
faea6234 | 131 | { |
2db9ca0a PB |
132 | struct mips_abi *abi = current->thread.abi; |
133 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; | |
134 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; | |
64243c2a PB |
135 | uint32_t __user *used_math = sc + abi->off_sc_used_math; |
136 | unsigned int used; | |
faea6234 | 137 | int err; |
689ee856 | 138 | |
0d071fa3 PB |
139 | used = used_math() ? USED_FP : 0; |
140 | if (used) { | |
141 | if (!test_thread_flag(TIF_32BIT_FPREGS)) | |
142 | used |= USED_FR1; | |
143 | if (test_thread_flag(TIF_HYBRID_FPREGS)) | |
144 | used |= USED_HYBRID_FPRS; | |
145 | } | |
146 | ||
64243c2a | 147 | err = __put_user(used, used_math); |
0d071fa3 | 148 | if (err || !(used & USED_FP)) |
64243c2a PB |
149 | return err; |
150 | ||
689ee856 PB |
151 | /* |
152 | * EVA does not have userland equivalents of ldc1 or sdc1, so | |
153 | * save to the kernel FP context & copy that to userland below. | |
154 | */ | |
155 | if (config_enabled(CONFIG_EVA)) | |
156 | lose_fpu(1); | |
157 | ||
faea6234 AN |
158 | while (1) { |
159 | lock_fpu_owner(); | |
ff3aa5f2 PB |
160 | if (is_fpu_owner()) { |
161 | err = save_fp_context(sc); | |
162 | unlock_fpu_owner(); | |
163 | } else { | |
164 | unlock_fpu_owner(); | |
165 | err = copy_fp_to_sigcontext(sc); | |
166 | } | |
faea6234 AN |
167 | if (likely(!err)) |
168 | break; | |
169 | /* touch the sigcontext and try again */ | |
2db9ca0a PB |
170 | err = __put_user(0, &fpregs[0]) | |
171 | __put_user(0, &fpregs[31]) | | |
172 | __put_user(0, csr); | |
faea6234 AN |
173 | if (err) |
174 | break; /* really bad sigcontext */ | |
175 | } | |
689ee856 | 176 | |
faea6234 AN |
177 | return err; |
178 | } | |
179 | ||
d02a40af | 180 | int protected_restore_fp_context(void __user *sc) |
faea6234 | 181 | { |
2db9ca0a PB |
182 | struct mips_abi *abi = current->thread.abi; |
183 | uint64_t __user *fpregs = sc + abi->off_sc_fpregs; | |
184 | uint32_t __user *csr = sc + abi->off_sc_fpc_csr; | |
64243c2a PB |
185 | uint32_t __user *used_math = sc + abi->off_sc_used_math; |
186 | unsigned int used; | |
187 | int err, sig, tmp __maybe_unused; | |
188 | ||
189 | err = __get_user(used, used_math); | |
0d071fa3 | 190 | conditional_used_math(used & USED_FP); |
64243c2a PB |
191 | |
192 | /* | |
193 | * The signal handler may have used FPU; give it up if the program | |
194 | * doesn't want it following sigreturn. | |
195 | */ | |
0d071fa3 | 196 | if (err || !(used & USED_FP)) { |
64243c2a PB |
197 | lose_fpu(0); |
198 | return err; | |
199 | } | |
200 | ||
201 | err = sig = fpcsr_pending(csr); | |
202 | if (err < 0) | |
203 | return err; | |
689ee856 PB |
204 | |
205 | /* | |
206 | * EVA does not have userland equivalents of ldc1 or sdc1, so we | |
207 | * disable the FPU here such that the code below simply copies to | |
208 | * the kernel FP context. | |
209 | */ | |
210 | if (config_enabled(CONFIG_EVA)) | |
211 | lose_fpu(0); | |
212 | ||
faea6234 AN |
213 | while (1) { |
214 | lock_fpu_owner(); | |
ff3aa5f2 PB |
215 | if (is_fpu_owner()) { |
216 | err = restore_fp_context(sc); | |
217 | unlock_fpu_owner(); | |
218 | } else { | |
219 | unlock_fpu_owner(); | |
220 | err = copy_fp_from_sigcontext(sc); | |
221 | } | |
faea6234 AN |
222 | if (likely(!err)) |
223 | break; | |
224 | /* touch the sigcontext and try again */ | |
2db9ca0a PB |
225 | err = __get_user(tmp, &fpregs[0]) | |
226 | __get_user(tmp, &fpregs[31]) | | |
227 | __get_user(tmp, csr); | |
faea6234 AN |
228 | if (err) |
229 | break; /* really bad sigcontext */ | |
230 | } | |
689ee856 | 231 | |
64243c2a | 232 | return err ?: sig; |
faea6234 AN |
233 | } |
234 | ||
c3fc4ab3 FBH |
235 | int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
236 | { | |
237 | int err = 0; | |
238 | int i; | |
239 | ||
240 | err |= __put_user(regs->cp0_epc, &sc->sc_pc); | |
241 | ||
242 | err |= __put_user(0, &sc->sc_regs[0]); | |
243 | for (i = 1; i < 32; i++) | |
244 | err |= __put_user(regs->regs[i], &sc->sc_regs[i]); | |
245 | ||
9693a853 FBH |
246 | #ifdef CONFIG_CPU_HAS_SMARTMIPS |
247 | err |= __put_user(regs->acx, &sc->sc_acx); | |
248 | #endif | |
c3fc4ab3 FBH |
249 | err |= __put_user(regs->hi, &sc->sc_mdhi); |
250 | err |= __put_user(regs->lo, &sc->sc_mdlo); | |
251 | if (cpu_has_dsp) { | |
252 | err |= __put_user(mfhi1(), &sc->sc_hi1); | |
253 | err |= __put_user(mflo1(), &sc->sc_lo1); | |
254 | err |= __put_user(mfhi2(), &sc->sc_hi2); | |
255 | err |= __put_user(mflo2(), &sc->sc_lo2); | |
256 | err |= __put_user(mfhi3(), &sc->sc_hi3); | |
257 | err |= __put_user(mflo3(), &sc->sc_lo3); | |
258 | err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); | |
259 | } | |
260 | ||
c3fc4ab3 | 261 | |
64243c2a PB |
262 | /* |
263 | * Save FPU state to signal context. Signal handler | |
264 | * will "inherit" current FPU state. | |
265 | */ | |
266 | err |= protected_save_fp_context(sc); | |
267 | ||
c3fc4ab3 FBH |
268 | return err; |
269 | } | |
270 | ||
c6a2f467 AN |
271 | int fpcsr_pending(unsigned int __user *fpcsr) |
272 | { | |
273 | int err, sig = 0; | |
274 | unsigned int csr, enabled; | |
275 | ||
276 | err = __get_user(csr, fpcsr); | |
277 | enabled = FPU_CSR_UNI_X | ((csr & FPU_CSR_ALL_E) << 5); | |
278 | /* | |
279 | * If the signal handler set some FPU exceptions, clear it and | |
280 | * send SIGFPE. | |
281 | */ | |
282 | if (csr & enabled) { | |
283 | csr &= ~enabled; | |
284 | err |= __put_user(csr, fpcsr); | |
285 | sig = SIGFPE; | |
286 | } | |
287 | return err ?: sig; | |
288 | } | |
289 | ||
c3fc4ab3 FBH |
290 | int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc) |
291 | { | |
c3fc4ab3 FBH |
292 | unsigned long treg; |
293 | int err = 0; | |
294 | int i; | |
295 | ||
296 | /* Always make any pending restarted system calls return -EINTR */ | |
f56141e3 | 297 | current->restart_block.fn = do_no_restart_syscall; |
c3fc4ab3 FBH |
298 | |
299 | err |= __get_user(regs->cp0_epc, &sc->sc_pc); | |
9693a853 FBH |
300 | |
301 | #ifdef CONFIG_CPU_HAS_SMARTMIPS | |
302 | err |= __get_user(regs->acx, &sc->sc_acx); | |
303 | #endif | |
c3fc4ab3 FBH |
304 | err |= __get_user(regs->hi, &sc->sc_mdhi); |
305 | err |= __get_user(regs->lo, &sc->sc_mdlo); | |
306 | if (cpu_has_dsp) { | |
307 | err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); | |
308 | err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); | |
309 | err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); | |
310 | err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); | |
311 | err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); | |
312 | err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); | |
313 | err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); | |
314 | } | |
315 | ||
316 | for (i = 1; i < 32; i++) | |
317 | err |= __get_user(regs->regs[i], &sc->sc_regs[i]); | |
318 | ||
64243c2a | 319 | return err ?: protected_restore_fp_context(sc); |
c3fc4ab3 FBH |
320 | } |
321 | ||
7c4f5635 | 322 | void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, |
c3fc4ab3 FBH |
323 | size_t frame_size) |
324 | { | |
325 | unsigned long sp; | |
326 | ||
327 | /* Default to using normal stack */ | |
328 | sp = regs->regs[29]; | |
329 | ||
330 | /* | |
331 | * FPU emulator may have it's own trampoline active just | |
332 | * above the user stack, 16-bytes before the next lowest | |
333 | * 16 byte boundary. Try to avoid trashing it. | |
334 | */ | |
335 | sp -= 32; | |
336 | ||
7c4f5635 | 337 | sp = sigsp(sp, ksig); |
c3fc4ab3 FBH |
338 | |
339 | return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK)); | |
340 | } | |
341 | ||
1da177e4 LT |
342 | /* |
343 | * Atomically swap in the new signal mask, and wait for a signal. | |
344 | */ | |
345 | ||
346 | #ifdef CONFIG_TRAD_SIGNALS | |
1910f4ab | 347 | SYSCALL_DEFINE1(sigsuspend, sigset_t __user *, uset) |
1da177e4 | 348 | { |
1910f4ab | 349 | return sys_rt_sigsuspend(uset, sizeof(sigset_t)); |
1da177e4 LT |
350 | } |
351 | #endif | |
352 | ||
1da177e4 | 353 | #ifdef CONFIG_TRAD_SIGNALS |
dbda6ac0 RB |
354 | SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act, |
355 | struct sigaction __user *, oact) | |
1da177e4 LT |
356 | { |
357 | struct k_sigaction new_ka, old_ka; | |
358 | int ret; | |
359 | int err = 0; | |
360 | ||
361 | if (act) { | |
362 | old_sigset_t mask; | |
363 | ||
364 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) | |
365 | return -EFAULT; | |
366 | err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler); | |
367 | err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); | |
368 | err |= __get_user(mask, &act->sa_mask.sig[0]); | |
369 | if (err) | |
370 | return -EFAULT; | |
371 | ||
372 | siginitset(&new_ka.sa.sa_mask, mask); | |
373 | } | |
374 | ||
375 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); | |
376 | ||
377 | if (!ret && oact) { | |
378 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact))) | |
e0daad44 | 379 | return -EFAULT; |
1da177e4 LT |
380 | err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
381 | err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler); | |
382 | err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); | |
383 | err |= __put_user(0, &oact->sa_mask.sig[1]); | |
384 | err |= __put_user(0, &oact->sa_mask.sig[2]); | |
385 | err |= __put_user(0, &oact->sa_mask.sig[3]); | |
386 | if (err) | |
387 | return -EFAULT; | |
388 | } | |
389 | ||
390 | return ret; | |
391 | } | |
392 | #endif | |
393 | ||
1da177e4 | 394 | #ifdef CONFIG_TRAD_SIGNALS |
f90080a0 | 395 | asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 396 | { |
9bbf28a3 | 397 | struct sigframe __user *frame; |
1da177e4 | 398 | sigset_t blocked; |
c6a2f467 | 399 | int sig; |
1da177e4 | 400 | |
9bbf28a3 | 401 | frame = (struct sigframe __user *) regs.regs[29]; |
1da177e4 LT |
402 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
403 | goto badframe; | |
404 | if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked))) | |
405 | goto badframe; | |
406 | ||
8598f3cd | 407 | set_current_blocked(&blocked); |
1da177e4 | 408 | |
c6a2f467 AN |
409 | sig = restore_sigcontext(®s, &frame->sf_sc); |
410 | if (sig < 0) | |
1da177e4 | 411 | goto badframe; |
c6a2f467 AN |
412 | else if (sig) |
413 | force_sig(sig, current); | |
1da177e4 LT |
414 | |
415 | /* | |
416 | * Don't let your children do this ... | |
417 | */ | |
1da177e4 LT |
418 | __asm__ __volatile__( |
419 | "move\t$29, %0\n\t" | |
420 | "j\tsyscall_exit" | |
421 | :/* no outputs */ | |
422 | :"r" (®s)); | |
423 | /* Unreached */ | |
424 | ||
425 | badframe: | |
426 | force_sig(SIGSEGV, current); | |
427 | } | |
e50c0a8f | 428 | #endif /* CONFIG_TRAD_SIGNALS */ |
1da177e4 | 429 | |
f90080a0 | 430 | asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs) |
1da177e4 | 431 | { |
9bbf28a3 | 432 | struct rt_sigframe __user *frame; |
1da177e4 | 433 | sigset_t set; |
c6a2f467 | 434 | int sig; |
1da177e4 | 435 | |
9bbf28a3 | 436 | frame = (struct rt_sigframe __user *) regs.regs[29]; |
1da177e4 LT |
437 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
438 | goto badframe; | |
439 | if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) | |
440 | goto badframe; | |
441 | ||
8598f3cd | 442 | set_current_blocked(&set); |
1da177e4 | 443 | |
c6a2f467 AN |
444 | sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext); |
445 | if (sig < 0) | |
1da177e4 | 446 | goto badframe; |
c6a2f467 AN |
447 | else if (sig) |
448 | force_sig(sig, current); | |
1da177e4 | 449 | |
ea536ad4 AV |
450 | if (restore_altstack(&frame->rs_uc.uc_stack)) |
451 | goto badframe; | |
1da177e4 LT |
452 | |
453 | /* | |
454 | * Don't let your children do this ... | |
455 | */ | |
456 | __asm__ __volatile__( | |
457 | "move\t$29, %0\n\t" | |
458 | "j\tsyscall_exit" | |
459 | :/* no outputs */ | |
460 | :"r" (®s)); | |
461 | /* Unreached */ | |
462 | ||
463 | badframe: | |
464 | force_sig(SIGSEGV, current); | |
465 | } | |
466 | ||
467 | #ifdef CONFIG_TRAD_SIGNALS | |
81d103bf RW |
468 | static int setup_frame(void *sig_return, struct ksignal *ksig, |
469 | struct pt_regs *regs, sigset_t *set) | |
1da177e4 | 470 | { |
9bbf28a3 | 471 | struct sigframe __user *frame; |
1da177e4 LT |
472 | int err = 0; |
473 | ||
7c4f5635 | 474 | frame = get_sigframe(ksig, regs, sizeof(*frame)); |
1da177e4 | 475 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) |
81d103bf | 476 | return -EFAULT; |
1da177e4 | 477 | |
1da177e4 LT |
478 | err |= setup_sigcontext(regs, &frame->sf_sc); |
479 | err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set)); | |
480 | if (err) | |
81d103bf | 481 | return -EFAULT; |
1da177e4 LT |
482 | |
483 | /* | |
484 | * Arguments to signal handler: | |
485 | * | |
486 | * a0 = signal number | |
487 | * a1 = 0 (should be cause) | |
488 | * a2 = pointer to struct sigcontext | |
489 | * | |
490 | * $25 and c0_epc point to the signal handler, $29 points to the | |
491 | * struct sigframe. | |
492 | */ | |
81d103bf | 493 | regs->regs[ 4] = ksig->sig; |
1da177e4 LT |
494 | regs->regs[ 5] = 0; |
495 | regs->regs[ 6] = (unsigned long) &frame->sf_sc; | |
496 | regs->regs[29] = (unsigned long) frame; | |
d814c28c | 497 | regs->regs[31] = (unsigned long) sig_return; |
81d103bf | 498 | regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 | 499 | |
722bb63d | 500 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 | 501 | current->comm, current->pid, |
722bb63d | 502 | frame, regs->cp0_epc, regs->regs[31]); |
e0daad44 | 503 | return 0; |
1da177e4 LT |
504 | } |
505 | #endif | |
506 | ||
81d103bf RW |
507 | static int setup_rt_frame(void *sig_return, struct ksignal *ksig, |
508 | struct pt_regs *regs, sigset_t *set) | |
1da177e4 | 509 | { |
9bbf28a3 | 510 | struct rt_sigframe __user *frame; |
1da177e4 LT |
511 | int err = 0; |
512 | ||
7c4f5635 | 513 | frame = get_sigframe(ksig, regs, sizeof(*frame)); |
1da177e4 | 514 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) |
81d103bf | 515 | return -EFAULT; |
1da177e4 | 516 | |
1da177e4 | 517 | /* Create siginfo. */ |
81d103bf | 518 | err |= copy_siginfo_to_user(&frame->rs_info, &ksig->info); |
1da177e4 | 519 | |
70342287 | 520 | /* Create the ucontext. */ |
1da177e4 | 521 | err |= __put_user(0, &frame->rs_uc.uc_flags); |
5665a0ac | 522 | err |= __put_user(NULL, &frame->rs_uc.uc_link); |
ea536ad4 | 523 | err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]); |
1da177e4 LT |
524 | err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); |
525 | err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); | |
526 | ||
527 | if (err) | |
81d103bf | 528 | return -EFAULT; |
1da177e4 LT |
529 | |
530 | /* | |
531 | * Arguments to signal handler: | |
532 | * | |
533 | * a0 = signal number | |
534 | * a1 = 0 (should be cause) | |
535 | * a2 = pointer to ucontext | |
536 | * | |
537 | * $25 and c0_epc point to the signal handler, $29 points to | |
538 | * the struct rt_sigframe. | |
539 | */ | |
81d103bf | 540 | regs->regs[ 4] = ksig->sig; |
1da177e4 LT |
541 | regs->regs[ 5] = (unsigned long) &frame->rs_info; |
542 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
543 | regs->regs[29] = (unsigned long) frame; | |
d814c28c | 544 | regs->regs[31] = (unsigned long) sig_return; |
81d103bf | 545 | regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler; |
1da177e4 | 546 | |
722bb63d | 547 | DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", |
1da177e4 LT |
548 | current->comm, current->pid, |
549 | frame, regs->cp0_epc, regs->regs[31]); | |
722bb63d | 550 | |
7b3e2fc8 | 551 | return 0; |
1da177e4 LT |
552 | } |
553 | ||
151fd6ac RB |
554 | struct mips_abi mips_abi = { |
555 | #ifdef CONFIG_TRAD_SIGNALS | |
556 | .setup_frame = setup_frame, | |
d814c28c | 557 | .signal_return_offset = offsetof(struct mips_vdso, signal_trampoline), |
151fd6ac | 558 | #endif |
70342287 | 559 | .setup_rt_frame = setup_rt_frame, |
d814c28c DD |
560 | .rt_signal_return_offset = |
561 | offsetof(struct mips_vdso, rt_signal_trampoline), | |
77856100 PB |
562 | .restart = __NR_restart_syscall, |
563 | ||
564 | .off_sc_fpregs = offsetof(struct sigcontext, sc_fpregs), | |
565 | .off_sc_fpc_csr = offsetof(struct sigcontext, sc_fpc_csr), | |
566 | .off_sc_used_math = offsetof(struct sigcontext, sc_used_math), | |
151fd6ac RB |
567 | }; |
568 | ||
81d103bf | 569 | static void handle_signal(struct ksignal *ksig, struct pt_regs *regs) |
1da177e4 | 570 | { |
b7f9a11a | 571 | sigset_t *oldset = sigmask_to_save(); |
129bc8f7 | 572 | int ret; |
d814c28c | 573 | struct mips_abi *abi = current->thread.abi; |
01be057b DL |
574 | #ifdef CONFIG_CPU_MICROMIPS |
575 | void *vdso; | |
2fabc7d2 | 576 | unsigned long tmp = (unsigned long)current->mm->context.vdso; |
01be057b DL |
577 | |
578 | set_isa16_mode(tmp); | |
579 | vdso = (void *)tmp; | |
580 | #else | |
d814c28c | 581 | void *vdso = current->mm->context.vdso; |
01be057b | 582 | #endif |
129bc8f7 | 583 | |
8f5a00eb AV |
584 | if (regs->regs[0]) { |
585 | switch(regs->regs[2]) { | |
586 | case ERESTART_RESTARTBLOCK: | |
587 | case ERESTARTNOHAND: | |
1da177e4 LT |
588 | regs->regs[2] = EINTR; |
589 | break; | |
8f5a00eb | 590 | case ERESTARTSYS: |
81d103bf | 591 | if (!(ksig->ka.sa.sa_flags & SA_RESTART)) { |
8f5a00eb AV |
592 | regs->regs[2] = EINTR; |
593 | break; | |
594 | } | |
595 | /* fallthrough */ | |
596 | case ERESTARTNOINTR: | |
597 | regs->regs[7] = regs->regs[26]; | |
598 | regs->regs[2] = regs->regs[0]; | |
599 | regs->cp0_epc -= 4; | |
1da177e4 | 600 | } |
1da177e4 | 601 | |
70342287 | 602 | regs->regs[0] = 0; /* Don't deal with this again. */ |
8f5a00eb | 603 | } |
1da177e4 | 604 | |
81d103bf | 605 | if (sig_uses_siginfo(&ksig->ka)) |
d814c28c | 606 | ret = abi->setup_rt_frame(vdso + abi->rt_signal_return_offset, |
81d103bf | 607 | ksig, regs, oldset); |
1da177e4 | 608 | else |
81d103bf RW |
609 | ret = abi->setup_frame(vdso + abi->signal_return_offset, ksig, |
610 | regs, oldset); | |
062ab57b | 611 | |
81d103bf | 612 | signal_setup_done(ret, ksig, 0); |
1da177e4 LT |
613 | } |
614 | ||
151fd6ac | 615 | static void do_signal(struct pt_regs *regs) |
1da177e4 | 616 | { |
81d103bf | 617 | struct ksignal ksig; |
1da177e4 | 618 | |
81d103bf | 619 | if (get_signal(&ksig)) { |
70342287 | 620 | /* Whee! Actually deliver the signal. */ |
81d103bf | 621 | handle_signal(&ksig, regs); |
45887e12 | 622 | return; |
7b3e2fc8 | 623 | } |
1da177e4 | 624 | |
1da177e4 | 625 | if (regs->regs[0]) { |
9ec9b5ac RB |
626 | switch (regs->regs[2]) { |
627 | case ERESTARTNOHAND: | |
628 | case ERESTARTSYS: | |
629 | case ERESTARTNOINTR: | |
8f5a00eb | 630 | regs->regs[2] = regs->regs[0]; |
1da177e4 | 631 | regs->regs[7] = regs->regs[26]; |
8f5a00eb | 632 | regs->cp0_epc -= 4; |
9ec9b5ac RB |
633 | break; |
634 | ||
635 | case ERESTART_RESTARTBLOCK: | |
151fd6ac | 636 | regs->regs[2] = current->thread.abi->restart; |
1da177e4 LT |
637 | regs->regs[7] = regs->regs[26]; |
638 | regs->cp0_epc -= 4; | |
9ec9b5ac | 639 | break; |
1da177e4 | 640 | } |
70342287 | 641 | regs->regs[0] = 0; /* Don't deal with this again. */ |
1da177e4 | 642 | } |
7b3e2fc8 RB |
643 | |
644 | /* | |
645 | * If there's no signal to deliver, we just put the saved sigmask | |
646 | * back | |
647 | */ | |
51a7b448 | 648 | restore_saved_sigmask(); |
1da177e4 LT |
649 | } |
650 | ||
651 | /* | |
652 | * notification of userspace execution resumption | |
7b3e2fc8 | 653 | * - triggered by the TIF_WORK_MASK flags |
1da177e4 | 654 | */ |
7b3e2fc8 | 655 | asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, |
1da177e4 LT |
656 | __u32 thread_info_flags) |
657 | { | |
1f717929 RB |
658 | local_irq_enable(); |
659 | ||
c3fc5cd5 RB |
660 | user_exit(); |
661 | ||
1da177e4 | 662 | /* deal with pending signal delivery */ |
6fd84c08 | 663 | if (thread_info_flags & _TIF_SIGPENDING) |
151fd6ac | 664 | do_signal(regs); |
d0420c83 DH |
665 | |
666 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { | |
667 | clear_thread_flag(TIF_NOTIFY_RESUME); | |
668 | tracehook_notify_resume(regs); | |
669 | } | |
c3fc5cd5 RB |
670 | |
671 | user_enter(); | |
1da177e4 | 672 | } |
137f6f3e RB |
673 | |
674 | #ifdef CONFIG_SMP | |
2db9ca0a | 675 | static int smp_save_fp_context(void __user *sc) |
137f6f3e RB |
676 | { |
677 | return raw_cpu_has_fpu | |
2db9ca0a | 678 | ? save_hw_fp_context(sc) |
b2ead528 | 679 | : copy_fp_to_sigcontext(sc); |
137f6f3e RB |
680 | } |
681 | ||
2db9ca0a | 682 | static int smp_restore_fp_context(void __user *sc) |
137f6f3e RB |
683 | { |
684 | return raw_cpu_has_fpu | |
2db9ca0a | 685 | ? restore_hw_fp_context(sc) |
b2ead528 | 686 | : copy_fp_from_sigcontext(sc); |
137f6f3e RB |
687 | } |
688 | #endif | |
689 | ||
690 | static int signal_setup(void) | |
691 | { | |
f1fe2d21 PB |
692 | /* |
693 | * The offset from sigcontext to extended context should be the same | |
694 | * regardless of the type of signal, such that userland can always know | |
695 | * where to look if it wishes to find the extended context structures. | |
696 | */ | |
697 | BUILD_BUG_ON((offsetof(struct sigframe, sf_extcontext) - | |
698 | offsetof(struct sigframe, sf_sc)) != | |
699 | (offsetof(struct rt_sigframe, rs_uc.uc_extcontext) - | |
700 | offsetof(struct rt_sigframe, rs_uc.uc_mcontext))); | |
701 | ||
137f6f3e RB |
702 | #ifdef CONFIG_SMP |
703 | /* For now just do the cpu_has_fpu check when the functions are invoked */ | |
704 | save_fp_context = smp_save_fp_context; | |
705 | restore_fp_context = smp_restore_fp_context; | |
706 | #else | |
707 | if (cpu_has_fpu) { | |
2db9ca0a PB |
708 | save_fp_context = save_hw_fp_context; |
709 | restore_fp_context = restore_hw_fp_context; | |
137f6f3e | 710 | } else { |
14fa12df PB |
711 | save_fp_context = copy_fp_to_sigcontext; |
712 | restore_fp_context = copy_fp_from_sigcontext; | |
137f6f3e | 713 | } |
ca750649 | 714 | #endif /* CONFIG_SMP */ |
137f6f3e RB |
715 | |
716 | return 0; | |
717 | } | |
718 | ||
719 | arch_initcall(signal_setup); |