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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/compiler.h>
12#include <linux/errno.h>
13#include <linux/kernel.h>
14#include <linux/signal.h>
15#include <linux/syscalls.h>
16
17#include <asm/compat.h>
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(VERIFY_READ, 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(VERIFY_WRITE, 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/system.h>
33#include <asm/fpu.h>
34#include <asm/war.h>
35#include <asm/vdso.h>
36
37#include "signal-common.h"
38
39static int (*save_fp_context32)(struct sigcontext32 __user *sc);
40static int (*restore_fp_context32)(struct sigcontext32 __user *sc);
41
42extern asmlinkage int _save_fp_context32(struct sigcontext32 __user *sc);
43extern asmlinkage int _restore_fp_context32(struct sigcontext32 __user *sc);
44
45extern asmlinkage int fpu_emulator_save_context32(struct sigcontext32 __user *sc);
46extern asmlinkage int fpu_emulator_restore_context32(struct sigcontext32 __user *sc);
47
48/*
49 * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
50 */
51#define __NR_O32_restart_syscall 4253
52
53/* 32-bit compatibility types */
54
55typedef unsigned int __sighandler32_t;
56typedef void (*vfptr_t)(void);
57
58struct sigaction32 {
59 unsigned int sa_flags;
60 __sighandler32_t sa_handler;
61 compat_sigset_t sa_mask;
62};
63
64/* IRIX compatible stack_t */
65typedef struct sigaltstack32 {
66 s32 ss_sp;
67 compat_size_t ss_size;
68 int ss_flags;
69} stack32_t;
70
71struct ucontext32 {
72 u32 uc_flags;
73 s32 uc_link;
74 stack32_t uc_stack;
75 struct sigcontext32 uc_mcontext;
76 compat_sigset_t uc_sigmask; /* mask last for extensibility */
77};
78
79struct sigframe32 {
80 u32 sf_ass[4]; /* argument save space for o32 */
81 u32 sf_pad[2]; /* Was: signal trampoline */
82 struct sigcontext32 sf_sc;
83 compat_sigset_t sf_mask;
84};
85
86struct rt_sigframe32 {
87 u32 rs_ass[4]; /* argument save space for o32 */
88 u32 rs_pad[2]; /* Was: signal trampoline */
89 compat_siginfo_t rs_info;
90 struct ucontext32 rs_uc;
91};
92
93/*
94 * sigcontext handlers
95 */
96static int protected_save_fp_context32(struct sigcontext32 __user *sc)
97{
98 int err;
99 while (1) {
100 lock_fpu_owner();
101 own_fpu_inatomic(1);
102 err = save_fp_context32(sc); /* this might fail */
103 unlock_fpu_owner();
104 if (likely(!err))
105 break;
106 /* touch the sigcontext and try again */
107 err = __put_user(0, &sc->sc_fpregs[0]) |
108 __put_user(0, &sc->sc_fpregs[31]) |
109 __put_user(0, &sc->sc_fpc_csr);
110 if (err)
111 break; /* really bad sigcontext */
112 }
113 return err;
114}
115
116static int protected_restore_fp_context32(struct sigcontext32 __user *sc)
117{
118 int err, tmp __maybe_unused;
119 while (1) {
120 lock_fpu_owner();
121 own_fpu_inatomic(0);
122 err = restore_fp_context32(sc); /* this might fail */
123 unlock_fpu_owner();
124 if (likely(!err))
125 break;
126 /* touch the sigcontext and try again */
127 err = __get_user(tmp, &sc->sc_fpregs[0]) |
128 __get_user(tmp, &sc->sc_fpregs[31]) |
129 __get_user(tmp, &sc->sc_fpc_csr);
130 if (err)
131 break; /* really bad sigcontext */
132 }
133 return err;
134}
135
136static int setup_sigcontext32(struct pt_regs *regs,
137 struct sigcontext32 __user *sc)
138{
139 int err = 0;
140 int i;
141 u32 used_math;
142
143 err |= __put_user(regs->cp0_epc, &sc->sc_pc);
144
145 err |= __put_user(0, &sc->sc_regs[0]);
146 for (i = 1; i < 32; i++)
147 err |= __put_user(regs->regs[i], &sc->sc_regs[i]);
148
149 err |= __put_user(regs->hi, &sc->sc_mdhi);
150 err |= __put_user(regs->lo, &sc->sc_mdlo);
151 if (cpu_has_dsp) {
152 err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
153 err |= __put_user(mfhi1(), &sc->sc_hi1);
154 err |= __put_user(mflo1(), &sc->sc_lo1);
155 err |= __put_user(mfhi2(), &sc->sc_hi2);
156 err |= __put_user(mflo2(), &sc->sc_lo2);
157 err |= __put_user(mfhi3(), &sc->sc_hi3);
158 err |= __put_user(mflo3(), &sc->sc_lo3);
159 }
160
161 used_math = !!used_math();
162 err |= __put_user(used_math, &sc->sc_used_math);
163
164 if (used_math) {
165 /*
166 * Save FPU state to signal context. Signal handler
167 * will "inherit" current FPU state.
168 */
169 err |= protected_save_fp_context32(sc);
170 }
171 return err;
172}
173
174static int
175check_and_restore_fp_context32(struct sigcontext32 __user *sc)
176{
177 int err, sig;
178
179 err = sig = fpcsr_pending(&sc->sc_fpc_csr);
180 if (err > 0)
181 err = 0;
182 err |= protected_restore_fp_context32(sc);
183 return err ?: sig;
184}
185
186static int restore_sigcontext32(struct pt_regs *regs,
187 struct sigcontext32 __user *sc)
188{
189 u32 used_math;
190 int err = 0;
191 s32 treg;
192 int i;
193
194 /* Always make any pending restarted system calls return -EINTR */
195 current_thread_info()->restart_block.fn = do_no_restart_syscall;
196
197 err |= __get_user(regs->cp0_epc, &sc->sc_pc);
198 err |= __get_user(regs->hi, &sc->sc_mdhi);
199 err |= __get_user(regs->lo, &sc->sc_mdlo);
200 if (cpu_has_dsp) {
201 err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
202 err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
203 err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
204 err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
205 err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
206 err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
207 err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
208 }
209
210 for (i = 1; i < 32; i++)
211 err |= __get_user(regs->regs[i], &sc->sc_regs[i]);
212
213 err |= __get_user(used_math, &sc->sc_used_math);
214 conditional_used_math(used_math);
215
216 if (used_math) {
217 /* restore fpu context if we have used it before */
218 if (!err)
219 err = check_and_restore_fp_context32(sc);
220 } else {
221 /* signal handler may have used FPU. Give it up. */
222 lose_fpu(0);
223 }
224
225 return err;
226}
227
228/*
229 *
230 */
231extern void __put_sigset_unknown_nsig(void);
232extern void __get_sigset_unknown_nsig(void);
233
234static inline int put_sigset(const sigset_t *kbuf, compat_sigset_t __user *ubuf)
235{
236 int err = 0;
237
238 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)))
239 return -EFAULT;
240
241 switch (_NSIG_WORDS) {
242 default:
243 __put_sigset_unknown_nsig();
244 case 2:
245 err |= __put_user(kbuf->sig[1] >> 32, &ubuf->sig[3]);
246 err |= __put_user(kbuf->sig[1] & 0xffffffff, &ubuf->sig[2]);
247 case 1:
248 err |= __put_user(kbuf->sig[0] >> 32, &ubuf->sig[1]);
249 err |= __put_user(kbuf->sig[0] & 0xffffffff, &ubuf->sig[0]);
250 }
251
252 return err;
253}
254
255static inline int get_sigset(sigset_t *kbuf, const compat_sigset_t __user *ubuf)
256{
257 int err = 0;
258 unsigned long sig[4];
259
260 if (!access_ok(VERIFY_READ, ubuf, sizeof(*ubuf)))
261 return -EFAULT;
262
263 switch (_NSIG_WORDS) {
264 default:
265 __get_sigset_unknown_nsig();
266 case 2:
267 err |= __get_user(sig[3], &ubuf->sig[3]);
268 err |= __get_user(sig[2], &ubuf->sig[2]);
269 kbuf->sig[1] = sig[2] | (sig[3] << 32);
270 case 1:
271 err |= __get_user(sig[1], &ubuf->sig[1]);
272 err |= __get_user(sig[0], &ubuf->sig[0]);
273 kbuf->sig[0] = sig[0] | (sig[1] << 32);
274 }
275
276 return err;
277}
278
279/*
280 * Atomically swap in the new signal mask, and wait for a signal.
281 */
282
283asmlinkage int sys32_sigsuspend(nabi_no_regargs struct pt_regs regs)
284{
285 compat_sigset_t __user *uset;
286 sigset_t newset;
287
288 uset = (compat_sigset_t __user *) regs.regs[4];
289 if (get_sigset(&newset, uset))
290 return -EFAULT;
291 sigdelsetmask(&newset, ~_BLOCKABLE);
292
293 spin_lock_irq(¤t->sighand->siglock);
294 current->saved_sigmask = current->blocked;
295 current->blocked = newset;
296 recalc_sigpending();
297 spin_unlock_irq(¤t->sighand->siglock);
298
299 current->state = TASK_INTERRUPTIBLE;
300 schedule();
301 set_thread_flag(TIF_RESTORE_SIGMASK);
302 return -ERESTARTNOHAND;
303}
304
305asmlinkage int sys32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
306{
307 compat_sigset_t __user *uset;
308 sigset_t newset;
309 size_t sigsetsize;
310
311 /* XXX Don't preclude handling different sized sigset_t's. */
312 sigsetsize = regs.regs[5];
313 if (sigsetsize != sizeof(compat_sigset_t))
314 return -EINVAL;
315
316 uset = (compat_sigset_t __user *) regs.regs[4];
317 if (get_sigset(&newset, uset))
318 return -EFAULT;
319 sigdelsetmask(&newset, ~_BLOCKABLE);
320
321 spin_lock_irq(¤t->sighand->siglock);
322 current->saved_sigmask = current->blocked;
323 current->blocked = newset;
324 recalc_sigpending();
325 spin_unlock_irq(¤t->sighand->siglock);
326
327 current->state = TASK_INTERRUPTIBLE;
328 schedule();
329 set_thread_flag(TIF_RESTORE_SIGMASK);
330 return -ERESTARTNOHAND;
331}
332
333SYSCALL_DEFINE3(32_sigaction, long, sig, const struct sigaction32 __user *, act,
334 struct sigaction32 __user *, oact)
335{
336 struct k_sigaction new_ka, old_ka;
337 int ret;
338 int err = 0;
339
340 if (act) {
341 old_sigset_t mask;
342 s32 handler;
343
344 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
345 return -EFAULT;
346 err |= __get_user(handler, &act->sa_handler);
347 new_ka.sa.sa_handler = (void __user *)(s64)handler;
348 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
349 err |= __get_user(mask, &act->sa_mask.sig[0]);
350 if (err)
351 return -EFAULT;
352
353 siginitset(&new_ka.sa.sa_mask, mask);
354 }
355
356 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
357
358 if (!ret && oact) {
359 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
360 return -EFAULT;
361 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
362 err |= __put_user((u32)(u64)old_ka.sa.sa_handler,
363 &oact->sa_handler);
364 err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
365 err |= __put_user(0, &oact->sa_mask.sig[1]);
366 err |= __put_user(0, &oact->sa_mask.sig[2]);
367 err |= __put_user(0, &oact->sa_mask.sig[3]);
368 if (err)
369 return -EFAULT;
370 }
371
372 return ret;
373}
374
375asmlinkage int sys32_sigaltstack(nabi_no_regargs struct pt_regs regs)
376{
377 const stack32_t __user *uss = (const stack32_t __user *) regs.regs[4];
378 stack32_t __user *uoss = (stack32_t __user *) regs.regs[5];
379 unsigned long usp = regs.regs[29];
380 stack_t kss, koss;
381 int ret, err = 0;
382 mm_segment_t old_fs = get_fs();
383 s32 sp;
384
385 if (uss) {
386 if (!access_ok(VERIFY_READ, uss, sizeof(*uss)))
387 return -EFAULT;
388 err |= __get_user(sp, &uss->ss_sp);
389 kss.ss_sp = (void __user *) (long) sp;
390 err |= __get_user(kss.ss_size, &uss->ss_size);
391 err |= __get_user(kss.ss_flags, &uss->ss_flags);
392 if (err)
393 return -EFAULT;
394 }
395
396 set_fs(KERNEL_DS);
397 ret = do_sigaltstack(uss ? (stack_t __user *)&kss : NULL,
398 uoss ? (stack_t __user *)&koss : NULL, usp);
399 set_fs(old_fs);
400
401 if (!ret && uoss) {
402 if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss)))
403 return -EFAULT;
404 sp = (int) (unsigned long) koss.ss_sp;
405 err |= __put_user(sp, &uoss->ss_sp);
406 err |= __put_user(koss.ss_size, &uoss->ss_size);
407 err |= __put_user(koss.ss_flags, &uoss->ss_flags);
408 if (err)
409 return -EFAULT;
410 }
411 return ret;
412}
413
414int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
415{
416 int err;
417
418 if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
419 return -EFAULT;
420
421 /* If you change siginfo_t structure, please be sure
422 this code is fixed accordingly.
423 It should never copy any pad contained in the structure
424 to avoid security leaks, but must copy the generic
425 3 ints plus the relevant union member.
426 This routine must convert siginfo from 64bit to 32bit as well
427 at the same time. */
428 err = __put_user(from->si_signo, &to->si_signo);
429 err |= __put_user(from->si_errno, &to->si_errno);
430 err |= __put_user((short)from->si_code, &to->si_code);
431 if (from->si_code < 0)
432 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
433 else {
434 switch (from->si_code >> 16) {
435 case __SI_TIMER >> 16:
436 err |= __put_user(from->si_tid, &to->si_tid);
437 err |= __put_user(from->si_overrun, &to->si_overrun);
438 err |= __put_user(from->si_int, &to->si_int);
439 break;
440 case __SI_CHLD >> 16:
441 err |= __put_user(from->si_utime, &to->si_utime);
442 err |= __put_user(from->si_stime, &to->si_stime);
443 err |= __put_user(from->si_status, &to->si_status);
444 default:
445 err |= __put_user(from->si_pid, &to->si_pid);
446 err |= __put_user(from->si_uid, &to->si_uid);
447 break;
448 case __SI_FAULT >> 16:
449 err |= __put_user((unsigned long)from->si_addr, &to->si_addr);
450 break;
451 case __SI_POLL >> 16:
452 err |= __put_user(from->si_band, &to->si_band);
453 err |= __put_user(from->si_fd, &to->si_fd);
454 break;
455 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
456 case __SI_MESGQ >> 16:
457 err |= __put_user(from->si_pid, &to->si_pid);
458 err |= __put_user(from->si_uid, &to->si_uid);
459 err |= __put_user(from->si_int, &to->si_int);
460 break;
461 }
462 }
463 return err;
464}
465
466int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
467{
468 memset(to, 0, sizeof *to);
469
470 if (copy_from_user(to, from, 3*sizeof(int)) ||
471 copy_from_user(to->_sifields._pad,
472 from->_sifields._pad, SI_PAD_SIZE32))
473 return -EFAULT;
474
475 return 0;
476}
477
478asmlinkage void sys32_sigreturn(nabi_no_regargs struct pt_regs regs)
479{
480 struct sigframe32 __user *frame;
481 sigset_t blocked;
482 int sig;
483
484 frame = (struct sigframe32 __user *) regs.regs[29];
485 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
486 goto badframe;
487 if (__copy_conv_sigset_from_user(&blocked, &frame->sf_mask))
488 goto badframe;
489
490 sigdelsetmask(&blocked, ~_BLOCKABLE);
491 spin_lock_irq(¤t->sighand->siglock);
492 current->blocked = blocked;
493 recalc_sigpending();
494 spin_unlock_irq(¤t->sighand->siglock);
495
496 sig = restore_sigcontext32(®s, &frame->sf_sc);
497 if (sig < 0)
498 goto badframe;
499 else if (sig)
500 force_sig(sig, current);
501
502 /*
503 * Don't let your children do this ...
504 */
505 __asm__ __volatile__(
506 "move\t$29, %0\n\t"
507 "j\tsyscall_exit"
508 :/* no outputs */
509 :"r" (®s));
510 /* Unreached */
511
512badframe:
513 force_sig(SIGSEGV, current);
514}
515
516asmlinkage void sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
517{
518 struct rt_sigframe32 __user *frame;
519 mm_segment_t old_fs;
520 sigset_t set;
521 stack_t st;
522 s32 sp;
523 int sig;
524
525 frame = (struct rt_sigframe32 __user *) regs.regs[29];
526 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
527 goto badframe;
528 if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
529 goto badframe;
530
531 sigdelsetmask(&set, ~_BLOCKABLE);
532 spin_lock_irq(¤t->sighand->siglock);
533 current->blocked = set;
534 recalc_sigpending();
535 spin_unlock_irq(¤t->sighand->siglock);
536
537 sig = restore_sigcontext32(®s, &frame->rs_uc.uc_mcontext);
538 if (sig < 0)
539 goto badframe;
540 else if (sig)
541 force_sig(sig, current);
542
543 /* The ucontext contains a stack32_t, so we must convert! */
544 if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp))
545 goto badframe;
546 st.ss_sp = (void __user *)(long) sp;
547 if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size))
548 goto badframe;
549 if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags))
550 goto badframe;
551
552 /* It is more difficult to avoid calling this function than to
553 call it and ignore errors. */
554 old_fs = get_fs();
555 set_fs(KERNEL_DS);
556 do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]);
557 set_fs(old_fs);
558
559 /*
560 * Don't let your children do this ...
561 */
562 __asm__ __volatile__(
563 "move\t$29, %0\n\t"
564 "j\tsyscall_exit"
565 :/* no outputs */
566 :"r" (®s));
567 /* Unreached */
568
569badframe:
570 force_sig(SIGSEGV, current);
571}
572
573static int setup_frame_32(void *sig_return, struct k_sigaction *ka,
574 struct pt_regs *regs, int signr, sigset_t *set)
575{
576 struct sigframe32 __user *frame;
577 int err = 0;
578
579 frame = get_sigframe(ka, regs, sizeof(*frame));
580 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
581 goto give_sigsegv;
582
583 err |= setup_sigcontext32(regs, &frame->sf_sc);
584 err |= __copy_conv_sigset_to_user(&frame->sf_mask, set);
585
586 if (err)
587 goto give_sigsegv;
588
589 /*
590 * Arguments to signal handler:
591 *
592 * a0 = signal number
593 * a1 = 0 (should be cause)
594 * a2 = pointer to struct sigcontext
595 *
596 * $25 and c0_epc point to the signal handler, $29 points to the
597 * struct sigframe.
598 */
599 regs->regs[ 4] = signr;
600 regs->regs[ 5] = 0;
601 regs->regs[ 6] = (unsigned long) &frame->sf_sc;
602 regs->regs[29] = (unsigned long) frame;
603 regs->regs[31] = (unsigned long) sig_return;
604 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
605
606 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
607 current->comm, current->pid,
608 frame, regs->cp0_epc, regs->regs[31]);
609
610 return 0;
611
612give_sigsegv:
613 force_sigsegv(signr, current);
614 return -EFAULT;
615}
616
617static int setup_rt_frame_32(void *sig_return, struct k_sigaction *ka,
618 struct pt_regs *regs, int signr, sigset_t *set,
619 siginfo_t *info)
620{
621 struct rt_sigframe32 __user *frame;
622 int err = 0;
623 s32 sp;
624
625 frame = get_sigframe(ka, regs, sizeof(*frame));
626 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
627 goto give_sigsegv;
628
629 /* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */
630 err |= copy_siginfo_to_user32(&frame->rs_info, info);
631
632 /* Create the ucontext. */
633 err |= __put_user(0, &frame->rs_uc.uc_flags);
634 err |= __put_user(0, &frame->rs_uc.uc_link);
635 sp = (int) (long) current->sas_ss_sp;
636 err |= __put_user(sp,
637 &frame->rs_uc.uc_stack.ss_sp);
638 err |= __put_user(sas_ss_flags(regs->regs[29]),
639 &frame->rs_uc.uc_stack.ss_flags);
640 err |= __put_user(current->sas_ss_size,
641 &frame->rs_uc.uc_stack.ss_size);
642 err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext);
643 err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
644
645 if (err)
646 goto give_sigsegv;
647
648 /*
649 * Arguments to signal handler:
650 *
651 * a0 = signal number
652 * a1 = 0 (should be cause)
653 * a2 = pointer to ucontext
654 *
655 * $25 and c0_epc point to the signal handler, $29 points to
656 * the struct rt_sigframe32.
657 */
658 regs->regs[ 4] = signr;
659 regs->regs[ 5] = (unsigned long) &frame->rs_info;
660 regs->regs[ 6] = (unsigned long) &frame->rs_uc;
661 regs->regs[29] = (unsigned long) frame;
662 regs->regs[31] = (unsigned long) sig_return;
663 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
664
665 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
666 current->comm, current->pid,
667 frame, regs->cp0_epc, regs->regs[31]);
668
669 return 0;
670
671give_sigsegv:
672 force_sigsegv(signr, current);
673 return -EFAULT;
674}
675
676/*
677 * o32 compatibility on 64-bit kernels, without DSP ASE
678 */
679struct mips_abi mips_abi_32 = {
680 .setup_frame = setup_frame_32,
681 .signal_return_offset =
682 offsetof(struct mips_vdso, o32_signal_trampoline),
683 .setup_rt_frame = setup_rt_frame_32,
684 .rt_signal_return_offset =
685 offsetof(struct mips_vdso, o32_rt_signal_trampoline),
686 .restart = __NR_O32_restart_syscall
687};
688
689SYSCALL_DEFINE4(32_rt_sigaction, int, sig,
690 const struct sigaction32 __user *, act,
691 struct sigaction32 __user *, oact, unsigned int, sigsetsize)
692{
693 struct k_sigaction new_sa, old_sa;
694 int ret = -EINVAL;
695
696 /* XXX: Don't preclude handling different sized sigset_t's. */
697 if (sigsetsize != sizeof(sigset_t))
698 goto out;
699
700 if (act) {
701 s32 handler;
702 int err = 0;
703
704 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
705 return -EFAULT;
706 err |= __get_user(handler, &act->sa_handler);
707 new_sa.sa.sa_handler = (void __user *)(s64)handler;
708 err |= __get_user(new_sa.sa.sa_flags, &act->sa_flags);
709 err |= get_sigset(&new_sa.sa.sa_mask, &act->sa_mask);
710 if (err)
711 return -EFAULT;
712 }
713
714 ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL);
715
716 if (!ret && oact) {
717 int err = 0;
718
719 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
720 return -EFAULT;
721
722 err |= __put_user((u32)(u64)old_sa.sa.sa_handler,
723 &oact->sa_handler);
724 err |= __put_user(old_sa.sa.sa_flags, &oact->sa_flags);
725 err |= put_sigset(&old_sa.sa.sa_mask, &oact->sa_mask);
726 if (err)
727 return -EFAULT;
728 }
729out:
730 return ret;
731}
732
733SYSCALL_DEFINE4(32_rt_sigprocmask, int, how, compat_sigset_t __user *, set,
734 compat_sigset_t __user *, oset, unsigned int, sigsetsize)
735{
736 sigset_t old_set, new_set;
737 int ret;
738 mm_segment_t old_fs = get_fs();
739
740 if (set && get_sigset(&new_set, set))
741 return -EFAULT;
742
743 set_fs(KERNEL_DS);
744 ret = sys_rt_sigprocmask(how, set ? (sigset_t __user *)&new_set : NULL,
745 oset ? (sigset_t __user *)&old_set : NULL,
746 sigsetsize);
747 set_fs(old_fs);
748
749 if (!ret && oset && put_sigset(&old_set, oset))
750 return -EFAULT;
751
752 return ret;
753}
754
755SYSCALL_DEFINE2(32_rt_sigpending, compat_sigset_t __user *, uset,
756 unsigned int, sigsetsize)
757{
758 int ret;
759 sigset_t set;
760 mm_segment_t old_fs = get_fs();
761
762 set_fs(KERNEL_DS);
763 ret = sys_rt_sigpending((sigset_t __user *)&set, sigsetsize);
764 set_fs(old_fs);
765
766 if (!ret && put_sigset(&set, uset))
767 return -EFAULT;
768
769 return ret;
770}
771
772SYSCALL_DEFINE3(32_rt_sigqueueinfo, int, pid, int, sig,
773 compat_siginfo_t __user *, uinfo)
774{
775 siginfo_t info;
776 int ret;
777 mm_segment_t old_fs = get_fs();
778
779 if (copy_from_user(&info, uinfo, 3*sizeof(int)) ||
780 copy_from_user(info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE))
781 return -EFAULT;
782 set_fs(KERNEL_DS);
783 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *)&info);
784 set_fs(old_fs);
785 return ret;
786}
787
788SYSCALL_DEFINE5(32_waitid, int, which, compat_pid_t, pid,
789 compat_siginfo_t __user *, uinfo, int, options,
790 struct compat_rusage __user *, uru)
791{
792 siginfo_t info;
793 struct rusage ru;
794 long ret;
795 mm_segment_t old_fs = get_fs();
796
797 info.si_signo = 0;
798 set_fs(KERNEL_DS);
799 ret = sys_waitid(which, pid, (siginfo_t __user *) &info, options,
800 uru ? (struct rusage __user *) &ru : NULL);
801 set_fs(old_fs);
802
803 if (ret < 0 || info.si_signo == 0)
804 return ret;
805
806 if (uru && (ret = put_compat_rusage(&ru, uru)))
807 return ret;
808
809 BUG_ON(info.si_code & __SI_MASK);
810 info.si_code |= __SI_CHLD;
811 return copy_siginfo_to_user32(uinfo, &info);
812}
813
814static int signal32_init(void)
815{
816 if (cpu_has_fpu) {
817 save_fp_context32 = _save_fp_context32;
818 restore_fp_context32 = _restore_fp_context32;
819 } else {
820 save_fp_context32 = fpu_emulator_save_context32;
821 restore_fp_context32 = fpu_emulator_restore_context32;
822 }
823
824 return 0;
825}
826
827arch_initcall(signal32_init);