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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, 2006 Ralf Baechle
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
9 * Copyright (C) 2016, Imagination Technologies Ltd.
10 */
11#include <linux/compat.h>
12#include <linux/compiler.h>
13#include <linux/errno.h>
14#include <linux/kernel.h>
15#include <linux/signal.h>
16#include <linux/syscalls.h>
17
18#include <asm/compat-signal.h>
19#include <linux/uaccess.h>
20#include <asm/unistd.h>
21
22#include "signal-common.h"
23
24/* 32-bit compatibility types */
25
26typedef unsigned int __sighandler32_t;
27typedef void (*vfptr_t)(void);
28
29/*
30 * Atomically swap in the new signal mask, and wait for a signal.
31 */
32
33asmlinkage int sys32_sigsuspend(compat_sigset_t __user *uset)
34{
35 return compat_sys_rt_sigsuspend(uset, sizeof(compat_sigset_t));
36}
37
38SYSCALL_DEFINE3(32_sigaction, long, sig, const struct compat_sigaction __user *, act,
39 struct compat_sigaction __user *, oact)
40{
41 struct k_sigaction new_ka, old_ka;
42 int ret;
43 int err = 0;
44
45 if (act) {
46 old_sigset_t mask;
47 s32 handler;
48
49 if (!access_ok(act, sizeof(*act)))
50 return -EFAULT;
51 err |= __get_user(handler, &act->sa_handler);
52 new_ka.sa.sa_handler = (void __user *)(s64)handler;
53 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
54 err |= __get_user(mask, &act->sa_mask.sig[0]);
55 if (err)
56 return -EFAULT;
57
58 siginitset(&new_ka.sa.sa_mask, mask);
59 }
60
61 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
62
63 if (!ret && oact) {
64 if (!access_ok(oact, sizeof(*oact)))
65 return -EFAULT;
66 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
67 err |= __put_user((u32)(u64)old_ka.sa.sa_handler,
68 &oact->sa_handler);
69 err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
70 err |= __put_user(0, &oact->sa_mask.sig[1]);
71 err |= __put_user(0, &oact->sa_mask.sig[2]);
72 err |= __put_user(0, &oact->sa_mask.sig[3]);
73 if (err)
74 return -EFAULT;
75 }
76
77 return ret;
78}
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, 2006 Ralf Baechle
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
9 */
10#include <linux/cache.h>
11#include <linux/compat.h>
12#include <linux/sched.h>
13#include <linux/mm.h>
14#include <linux/smp.h>
15#include <linux/kernel.h>
16#include <linux/signal.h>
17#include <linux/syscalls.h>
18#include <linux/errno.h>
19#include <linux/wait.h>
20#include <linux/ptrace.h>
21#include <linux/suspend.h>
22#include <linux/compiler.h>
23#include <linux/uaccess.h>
24
25#include <asm/abi.h>
26#include <asm/asm.h>
27#include <asm/compat-signal.h>
28#include <linux/bitops.h>
29#include <asm/cacheflush.h>
30#include <asm/sim.h>
31#include <asm/ucontext.h>
32#include <asm/fpu.h>
33#include <asm/msa.h>
34#include <asm/war.h>
35#include <asm/vdso.h>
36#include <asm/dsp.h>
37
38#include "signal-common.h"
39
40static int (*save_fp_context32)(struct sigcontext32 __user *sc);
41static int (*restore_fp_context32)(struct sigcontext32 __user *sc);
42
43extern asmlinkage int _save_fp_context32(struct sigcontext32 __user *sc);
44extern asmlinkage int _restore_fp_context32(struct sigcontext32 __user *sc);
45
46extern asmlinkage int _save_msa_context32(struct sigcontext32 __user *sc);
47extern asmlinkage int _restore_msa_context32(struct sigcontext32 __user *sc);
48
49/*
50 * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
51 */
52#define __NR_O32_restart_syscall 4253
53
54/* 32-bit compatibility types */
55
56typedef unsigned int __sighandler32_t;
57typedef void (*vfptr_t)(void);
58
59struct ucontext32 {
60 u32 uc_flags;
61 s32 uc_link;
62 compat_stack_t uc_stack;
63 struct sigcontext32 uc_mcontext;
64 compat_sigset_t uc_sigmask; /* mask last for extensibility */
65};
66
67struct sigframe32 {
68 u32 sf_ass[4]; /* argument save space for o32 */
69 u32 sf_pad[2]; /* Was: signal trampoline */
70 struct sigcontext32 sf_sc;
71 compat_sigset_t sf_mask;
72};
73
74struct rt_sigframe32 {
75 u32 rs_ass[4]; /* argument save space for o32 */
76 u32 rs_pad[2]; /* Was: signal trampoline */
77 compat_siginfo_t rs_info;
78 struct ucontext32 rs_uc;
79};
80
81/*
82 * Thread saved context copy to/from a signal context presumed to be on the
83 * user stack, and therefore accessed with appropriate macros from uaccess.h.
84 */
85static int copy_fp_to_sigcontext32(struct sigcontext32 __user *sc)
86{
87 int i;
88 int err = 0;
89 int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1;
90
91 for (i = 0; i < NUM_FPU_REGS; i += inc) {
92 err |=
93 __put_user(get_fpr64(¤t->thread.fpu.fpr[i], 0),
94 &sc->sc_fpregs[i]);
95 }
96 err |= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
97
98 return err;
99}
100
101static int copy_fp_from_sigcontext32(struct sigcontext32 __user *sc)
102{
103 int i;
104 int err = 0;
105 int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1;
106 u64 fpr_val;
107
108 for (i = 0; i < NUM_FPU_REGS; i += inc) {
109 err |= __get_user(fpr_val, &sc->sc_fpregs[i]);
110 set_fpr64(¤t->thread.fpu.fpr[i], 0, fpr_val);
111 }
112 err |= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
113
114 return err;
115}
116
117/*
118 * These functions will save only the upper 64 bits of the vector registers,
119 * since the lower 64 bits have already been saved as the scalar FP context.
120 */
121static int copy_msa_to_sigcontext32(struct sigcontext32 __user *sc)
122{
123 int i;
124 int err = 0;
125
126 for (i = 0; i < NUM_FPU_REGS; i++) {
127 err |=
128 __put_user(get_fpr64(¤t->thread.fpu.fpr[i], 1),
129 &sc->sc_msaregs[i]);
130 }
131 err |= __put_user(current->thread.fpu.msacsr, &sc->sc_msa_csr);
132
133 return err;
134}
135
136static int copy_msa_from_sigcontext32(struct sigcontext32 __user *sc)
137{
138 int i;
139 int err = 0;
140 u64 val;
141
142 for (i = 0; i < NUM_FPU_REGS; i++) {
143 err |= __get_user(val, &sc->sc_msaregs[i]);
144 set_fpr64(¤t->thread.fpu.fpr[i], 1, val);
145 }
146 err |= __get_user(current->thread.fpu.msacsr, &sc->sc_msa_csr);
147
148 return err;
149}
150
151/*
152 * sigcontext handlers
153 */
154static int protected_save_fp_context32(struct sigcontext32 __user *sc,
155 unsigned used_math)
156{
157 int err;
158 bool save_msa = cpu_has_msa && (used_math & USEDMATH_MSA);
159 while (1) {
160 lock_fpu_owner();
161 if (is_fpu_owner()) {
162 err = save_fp_context32(sc);
163 if (save_msa && !err)
164 err = _save_msa_context32(sc);
165 unlock_fpu_owner();
166 } else {
167 unlock_fpu_owner();
168 err = copy_fp_to_sigcontext32(sc);
169 if (save_msa && !err)
170 err = copy_msa_to_sigcontext32(sc);
171 }
172 if (likely(!err))
173 break;
174 /* touch the sigcontext and try again */
175 err = __put_user(0, &sc->sc_fpregs[0]) |
176 __put_user(0, &sc->sc_fpregs[31]) |
177 __put_user(0, &sc->sc_fpc_csr);
178 if (err)
179 break; /* really bad sigcontext */
180 }
181 return err;
182}
183
184static int protected_restore_fp_context32(struct sigcontext32 __user *sc,
185 unsigned used_math)
186{
187 int err, tmp __maybe_unused;
188 bool restore_msa = cpu_has_msa && (used_math & USEDMATH_MSA);
189 while (1) {
190 lock_fpu_owner();
191 if (is_fpu_owner()) {
192 err = restore_fp_context32(sc);
193 if (restore_msa && !err) {
194 enable_msa();
195 err = _restore_msa_context32(sc);
196 } else {
197 /* signal handler may have used MSA */
198 disable_msa();
199 }
200 unlock_fpu_owner();
201 } else {
202 unlock_fpu_owner();
203 err = copy_fp_from_sigcontext32(sc);
204 if (restore_msa && !err)
205 err = copy_msa_from_sigcontext32(sc);
206 }
207 if (likely(!err))
208 break;
209 /* touch the sigcontext and try again */
210 err = __get_user(tmp, &sc->sc_fpregs[0]) |
211 __get_user(tmp, &sc->sc_fpregs[31]) |
212 __get_user(tmp, &sc->sc_fpc_csr);
213 if (err)
214 break; /* really bad sigcontext */
215 }
216 return err;
217}
218
219static int setup_sigcontext32(struct pt_regs *regs,
220 struct sigcontext32 __user *sc)
221{
222 int err = 0;
223 int i;
224 u32 used_math;
225
226 err |= __put_user(regs->cp0_epc, &sc->sc_pc);
227
228 err |= __put_user(0, &sc->sc_regs[0]);
229 for (i = 1; i < 32; i++)
230 err |= __put_user(regs->regs[i], &sc->sc_regs[i]);
231
232 err |= __put_user(regs->hi, &sc->sc_mdhi);
233 err |= __put_user(regs->lo, &sc->sc_mdlo);
234 if (cpu_has_dsp) {
235 err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
236 err |= __put_user(mfhi1(), &sc->sc_hi1);
237 err |= __put_user(mflo1(), &sc->sc_lo1);
238 err |= __put_user(mfhi2(), &sc->sc_hi2);
239 err |= __put_user(mflo2(), &sc->sc_lo2);
240 err |= __put_user(mfhi3(), &sc->sc_hi3);
241 err |= __put_user(mflo3(), &sc->sc_lo3);
242 }
243
244 used_math = used_math() ? USEDMATH_FP : 0;
245 used_math |= thread_msa_context_live() ? USEDMATH_MSA : 0;
246 err |= __put_user(used_math, &sc->sc_used_math);
247
248 if (used_math) {
249 /*
250 * Save FPU state to signal context. Signal handler
251 * will "inherit" current FPU state.
252 */
253 err |= protected_save_fp_context32(sc, used_math);
254 }
255 return err;
256}
257
258static int
259check_and_restore_fp_context32(struct sigcontext32 __user *sc,
260 unsigned used_math)
261{
262 int err, sig;
263
264 err = sig = fpcsr_pending(&sc->sc_fpc_csr);
265 if (err > 0)
266 err = 0;
267 err |= protected_restore_fp_context32(sc, used_math);
268 return err ?: sig;
269}
270
271static int restore_sigcontext32(struct pt_regs *regs,
272 struct sigcontext32 __user *sc)
273{
274 u32 used_math;
275 int err = 0;
276 s32 treg;
277 int i;
278
279 /* Always make any pending restarted system calls return -EINTR */
280 current_thread_info()->restart_block.fn = do_no_restart_syscall;
281
282 err |= __get_user(regs->cp0_epc, &sc->sc_pc);
283 err |= __get_user(regs->hi, &sc->sc_mdhi);
284 err |= __get_user(regs->lo, &sc->sc_mdlo);
285 if (cpu_has_dsp) {
286 err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
287 err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
288 err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
289 err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
290 err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
291 err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
292 err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
293 }
294
295 for (i = 1; i < 32; i++)
296 err |= __get_user(regs->regs[i], &sc->sc_regs[i]);
297
298 err |= __get_user(used_math, &sc->sc_used_math);
299 conditional_used_math(used_math);
300
301 if (used_math) {
302 /* restore fpu context if we have used it before */
303 if (!err)
304 err = check_and_restore_fp_context32(sc, used_math);
305 } else {
306 /* signal handler may have used FPU or MSA. Disable them. */
307 disable_msa();
308 lose_fpu(0);
309 }
310
311 return err;
312}
313
314/*
315 *
316 */
317extern void __put_sigset_unknown_nsig(void);
318extern void __get_sigset_unknown_nsig(void);
319
320static inline int put_sigset(const sigset_t *kbuf, compat_sigset_t __user *ubuf)
321{
322 int err = 0;
323
324 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)))
325 return -EFAULT;
326
327 switch (_NSIG_WORDS) {
328 default:
329 __put_sigset_unknown_nsig();
330 case 2:
331 err |= __put_user(kbuf->sig[1] >> 32, &ubuf->sig[3]);
332 err |= __put_user(kbuf->sig[1] & 0xffffffff, &ubuf->sig[2]);
333 case 1:
334 err |= __put_user(kbuf->sig[0] >> 32, &ubuf->sig[1]);
335 err |= __put_user(kbuf->sig[0] & 0xffffffff, &ubuf->sig[0]);
336 }
337
338 return err;
339}
340
341static inline int get_sigset(sigset_t *kbuf, const compat_sigset_t __user *ubuf)
342{
343 int err = 0;
344 unsigned long sig[4];
345
346 if (!access_ok(VERIFY_READ, ubuf, sizeof(*ubuf)))
347 return -EFAULT;
348
349 switch (_NSIG_WORDS) {
350 default:
351 __get_sigset_unknown_nsig();
352 case 2:
353 err |= __get_user(sig[3], &ubuf->sig[3]);
354 err |= __get_user(sig[2], &ubuf->sig[2]);
355 kbuf->sig[1] = sig[2] | (sig[3] << 32);
356 case 1:
357 err |= __get_user(sig[1], &ubuf->sig[1]);
358 err |= __get_user(sig[0], &ubuf->sig[0]);
359 kbuf->sig[0] = sig[0] | (sig[1] << 32);
360 }
361
362 return err;
363}
364
365/*
366 * Atomically swap in the new signal mask, and wait for a signal.
367 */
368
369asmlinkage int sys32_sigsuspend(compat_sigset_t __user *uset)
370{
371 return compat_sys_rt_sigsuspend(uset, sizeof(compat_sigset_t));
372}
373
374SYSCALL_DEFINE3(32_sigaction, long, sig, const struct compat_sigaction __user *, act,
375 struct compat_sigaction __user *, oact)
376{
377 struct k_sigaction new_ka, old_ka;
378 int ret;
379 int err = 0;
380
381 if (act) {
382 old_sigset_t mask;
383 s32 handler;
384
385 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
386 return -EFAULT;
387 err |= __get_user(handler, &act->sa_handler);
388 new_ka.sa.sa_handler = (void __user *)(s64)handler;
389 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
390 err |= __get_user(mask, &act->sa_mask.sig[0]);
391 if (err)
392 return -EFAULT;
393
394 siginitset(&new_ka.sa.sa_mask, mask);
395 }
396
397 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
398
399 if (!ret && oact) {
400 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
401 return -EFAULT;
402 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
403 err |= __put_user((u32)(u64)old_ka.sa.sa_handler,
404 &oact->sa_handler);
405 err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
406 err |= __put_user(0, &oact->sa_mask.sig[1]);
407 err |= __put_user(0, &oact->sa_mask.sig[2]);
408 err |= __put_user(0, &oact->sa_mask.sig[3]);
409 if (err)
410 return -EFAULT;
411 }
412
413 return ret;
414}
415
416int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from)
417{
418 int err;
419
420 if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
421 return -EFAULT;
422
423 /* If you change siginfo_t structure, please be sure
424 this code is fixed accordingly.
425 It should never copy any pad contained in the structure
426 to avoid security leaks, but must copy the generic
427 3 ints plus the relevant union member.
428 This routine must convert siginfo from 64bit to 32bit as well
429 at the same time. */
430 err = __put_user(from->si_signo, &to->si_signo);
431 err |= __put_user(from->si_errno, &to->si_errno);
432 err |= __put_user((short)from->si_code, &to->si_code);
433 if (from->si_code < 0)
434 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
435 else {
436 switch (from->si_code >> 16) {
437 case __SI_TIMER >> 16:
438 err |= __put_user(from->si_tid, &to->si_tid);
439 err |= __put_user(from->si_overrun, &to->si_overrun);
440 err |= __put_user(from->si_int, &to->si_int);
441 break;
442 case __SI_CHLD >> 16:
443 err |= __put_user(from->si_utime, &to->si_utime);
444 err |= __put_user(from->si_stime, &to->si_stime);
445 err |= __put_user(from->si_status, &to->si_status);
446 default:
447 err |= __put_user(from->si_pid, &to->si_pid);
448 err |= __put_user(from->si_uid, &to->si_uid);
449 break;
450 case __SI_FAULT >> 16:
451 err |= __put_user((unsigned long)from->si_addr, &to->si_addr);
452 break;
453 case __SI_POLL >> 16:
454 err |= __put_user(from->si_band, &to->si_band);
455 err |= __put_user(from->si_fd, &to->si_fd);
456 break;
457 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
458 case __SI_MESGQ >> 16:
459 err |= __put_user(from->si_pid, &to->si_pid);
460 err |= __put_user(from->si_uid, &to->si_uid);
461 err |= __put_user(from->si_int, &to->si_int);
462 break;
463 }
464 }
465 return err;
466}
467
468int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
469{
470 memset(to, 0, sizeof *to);
471
472 if (copy_from_user(to, from, 3*sizeof(int)) ||
473 copy_from_user(to->_sifields._pad,
474 from->_sifields._pad, SI_PAD_SIZE32))
475 return -EFAULT;
476
477 return 0;
478}
479
480asmlinkage void sys32_sigreturn(nabi_no_regargs struct pt_regs regs)
481{
482 struct sigframe32 __user *frame;
483 sigset_t blocked;
484 int sig;
485
486 frame = (struct sigframe32 __user *) regs.regs[29];
487 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
488 goto badframe;
489 if (__copy_conv_sigset_from_user(&blocked, &frame->sf_mask))
490 goto badframe;
491
492 set_current_blocked(&blocked);
493
494 sig = restore_sigcontext32(®s, &frame->sf_sc);
495 if (sig < 0)
496 goto badframe;
497 else if (sig)
498 force_sig(sig, current);
499
500 /*
501 * Don't let your children do this ...
502 */
503 __asm__ __volatile__(
504 "move\t$29, %0\n\t"
505 "j\tsyscall_exit"
506 :/* no outputs */
507 :"r" (®s));
508 /* Unreached */
509
510badframe:
511 force_sig(SIGSEGV, current);
512}
513
514asmlinkage void sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
515{
516 struct rt_sigframe32 __user *frame;
517 sigset_t set;
518 int sig;
519
520 frame = (struct rt_sigframe32 __user *) regs.regs[29];
521 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
522 goto badframe;
523 if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
524 goto badframe;
525
526 set_current_blocked(&set);
527
528 sig = restore_sigcontext32(®s, &frame->rs_uc.uc_mcontext);
529 if (sig < 0)
530 goto badframe;
531 else if (sig)
532 force_sig(sig, current);
533
534 if (compat_restore_altstack(&frame->rs_uc.uc_stack))
535 goto badframe;
536
537 /*
538 * Don't let your children do this ...
539 */
540 __asm__ __volatile__(
541 "move\t$29, %0\n\t"
542 "j\tsyscall_exit"
543 :/* no outputs */
544 :"r" (®s));
545 /* Unreached */
546
547badframe:
548 force_sig(SIGSEGV, current);
549}
550
551static int setup_frame_32(void *sig_return, struct k_sigaction *ka,
552 struct pt_regs *regs, int signr, sigset_t *set)
553{
554 struct sigframe32 __user *frame;
555 int err = 0;
556
557 frame = get_sigframe(ka, regs, sizeof(*frame));
558 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
559 goto give_sigsegv;
560
561 err |= setup_sigcontext32(regs, &frame->sf_sc);
562 err |= __copy_conv_sigset_to_user(&frame->sf_mask, set);
563
564 if (err)
565 goto give_sigsegv;
566
567 /*
568 * Arguments to signal handler:
569 *
570 * a0 = signal number
571 * a1 = 0 (should be cause)
572 * a2 = pointer to struct sigcontext
573 *
574 * $25 and c0_epc point to the signal handler, $29 points to the
575 * struct sigframe.
576 */
577 regs->regs[ 4] = signr;
578 regs->regs[ 5] = 0;
579 regs->regs[ 6] = (unsigned long) &frame->sf_sc;
580 regs->regs[29] = (unsigned long) frame;
581 regs->regs[31] = (unsigned long) sig_return;
582 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
583
584 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
585 current->comm, current->pid,
586 frame, regs->cp0_epc, regs->regs[31]);
587
588 return 0;
589
590give_sigsegv:
591 force_sigsegv(signr, current);
592 return -EFAULT;
593}
594
595static int setup_rt_frame_32(void *sig_return, struct k_sigaction *ka,
596 struct pt_regs *regs, int signr, sigset_t *set,
597 siginfo_t *info)
598{
599 struct rt_sigframe32 __user *frame;
600 int err = 0;
601
602 frame = get_sigframe(ka, regs, sizeof(*frame));
603 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
604 goto give_sigsegv;
605
606 /* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */
607 err |= copy_siginfo_to_user32(&frame->rs_info, info);
608
609 /* Create the ucontext. */
610 err |= __put_user(0, &frame->rs_uc.uc_flags);
611 err |= __put_user(0, &frame->rs_uc.uc_link);
612 err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
613 err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext);
614 err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
615
616 if (err)
617 goto give_sigsegv;
618
619 /*
620 * Arguments to signal handler:
621 *
622 * a0 = signal number
623 * a1 = 0 (should be cause)
624 * a2 = pointer to ucontext
625 *
626 * $25 and c0_epc point to the signal handler, $29 points to
627 * the struct rt_sigframe32.
628 */
629 regs->regs[ 4] = signr;
630 regs->regs[ 5] = (unsigned long) &frame->rs_info;
631 regs->regs[ 6] = (unsigned long) &frame->rs_uc;
632 regs->regs[29] = (unsigned long) frame;
633 regs->regs[31] = (unsigned long) sig_return;
634 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
635
636 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
637 current->comm, current->pid,
638 frame, regs->cp0_epc, regs->regs[31]);
639
640 return 0;
641
642give_sigsegv:
643 force_sigsegv(signr, current);
644 return -EFAULT;
645}
646
647/*
648 * o32 compatibility on 64-bit kernels, without DSP ASE
649 */
650struct mips_abi mips_abi_32 = {
651 .setup_frame = setup_frame_32,
652 .signal_return_offset =
653 offsetof(struct mips_vdso, o32_signal_trampoline),
654 .setup_rt_frame = setup_rt_frame_32,
655 .rt_signal_return_offset =
656 offsetof(struct mips_vdso, o32_rt_signal_trampoline),
657 .restart = __NR_O32_restart_syscall
658};
659
660static int signal32_init(void)
661{
662 if (cpu_has_fpu) {
663 save_fp_context32 = _save_fp_context32;
664 restore_fp_context32 = _restore_fp_context32;
665 } else {
666 save_fp_context32 = copy_fp_to_sigcontext32;
667 restore_fp_context32 = copy_fp_from_sigcontext32;
668 }
669
670 return 0;
671}
672
673arch_initcall(signal32_init);