?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[MIPS] Add support for TIF_RESTORE_SIGMASK for signal32
[linux-2.6/mini2440.git] / arch / mips / kernel / signal32.c
blobc07019575214a9c9be85edcbd72bc6589af6a687
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.
9 */
10 #include <linux/cache.h>
11 #include <linux/sched.h>
12 #include <linux/mm.h>
13 #include <linux/smp.h>
14 #include <linux/smp_lock.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/compat.h>
22 #include <linux/suspend.h>
23 #include <linux/compiler.h>
24
25 #include <asm/abi.h>
26 #include <asm/asm.h>
27 #include <linux/bitops.h>
28 #include <asm/cacheflush.h>
29 #include <asm/sim.h>
30 #include <asm/uaccess.h>
31 #include <asm/ucontext.h>
32 #include <asm/system.h>
33 #include <asm/fpu.h>
34 #include <asm/war.h>
35
36 #define SI_PAD_SIZE32 ((SI_MAX_SIZE/sizeof(int)) - 3)
37
38 typedef struct compat_siginfo {
39 int si_signo;
40 int si_code;
41 int si_errno;
42
43 union {
44 int _pad[SI_PAD_SIZE32];
45
46 /* kill() */
47 struct {
48 compat_pid_t _pid; /* sender's pid */
49 compat_uid_t _uid; /* sender's uid */
50 } _kill;
51
52 /* SIGCHLD */
53 struct {
54 compat_pid_t _pid; /* which child */
55 compat_uid_t _uid; /* sender's uid */
56 int _status; /* exit code */
57 compat_clock_t _utime;
58 compat_clock_t _stime;
59 } _sigchld;
60
61 /* IRIX SIGCHLD */
62 struct {
63 compat_pid_t _pid; /* which child */
64 compat_clock_t _utime;
65 int _status; /* exit code */
66 compat_clock_t _stime;
67 } _irix_sigchld;
68
69 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
70 struct {
71 s32 _addr; /* faulting insn/memory ref. */
72 } _sigfault;
73
74 /* SIGPOLL, SIGXFSZ (To do ...) */
75 struct {
76 int _band; /* POLL_IN, POLL_OUT, POLL_MSG */
77 int _fd;
78 } _sigpoll;
79
80 /* POSIX.1b timers */
81 struct {
82 timer_t _tid; /* timer id */
83 int _overrun; /* overrun count */
84 compat_sigval_t _sigval;/* same as below */
85 int _sys_private; /* not to be passed to user */
86 } _timer;
87
88 /* POSIX.1b signals */
89 struct {
90 compat_pid_t _pid; /* sender's pid */
91 compat_uid_t _uid; /* sender's uid */
92 compat_sigval_t _sigval;
93 } _rt;
94
95 } _sifields;
96 } compat_siginfo_t;
97
98 /*
99 * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
100 */
101 #define __NR_O32_sigreturn 4119
102 #define __NR_O32_rt_sigreturn 4193
103 #define __NR_O32_restart_syscall 4253
104
105 #define DEBUG_SIG 0
106
107 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
108
109 /* 32-bit compatibility types */
110
111 #define _NSIG_BPW32 32
112 #define _NSIG_WORDS32 (_NSIG / _NSIG_BPW32)
113
114 typedef struct {
115 unsigned int sig[_NSIG_WORDS32];
116 } sigset_t32;
117
118 typedef unsigned int __sighandler32_t;
119 typedef void (*vfptr_t)(void);
120
121 struct sigaction32 {
122 unsigned int sa_flags;
123 __sighandler32_t sa_handler;
124 compat_sigset_t sa_mask;
125 };
126
127 /* IRIX compatible stack_t */
128 typedef struct sigaltstack32 {
129 s32 ss_sp;
130 compat_size_t ss_size;
131 int ss_flags;
132 } stack32_t;
133
134 struct ucontext32 {
135 u32 uc_flags;
136 s32 uc_link;
137 stack32_t uc_stack;
138 struct sigcontext32 uc_mcontext;
139 sigset_t32 uc_sigmask; /* mask last for extensibility */
140 };
141
142 extern void __put_sigset_unknown_nsig(void);
143 extern void __get_sigset_unknown_nsig(void);
144
145 static inline int put_sigset(const sigset_t *kbuf, compat_sigset_t __user *ubuf)
146 {
147 int err = 0;
148
149 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)))
150 return -EFAULT;
151
152 switch (_NSIG_WORDS) {
153 default:
154 __put_sigset_unknown_nsig();
155 case 2:
156 err |= __put_user (kbuf->sig[1] >> 32, &ubuf->sig[3]);
157 err |= __put_user (kbuf->sig[1] & 0xffffffff, &ubuf->sig[2]);
158 case 1:
159 err |= __put_user (kbuf->sig[0] >> 32, &ubuf->sig[1]);
160 err |= __put_user (kbuf->sig[0] & 0xffffffff, &ubuf->sig[0]);
161 }
162
163 return err;
164 }
165
166 static inline int get_sigset(sigset_t *kbuf, const compat_sigset_t *ubuf)
167 {
168 int err = 0;
169 unsigned long sig[4];
170
171 if (!access_ok(VERIFY_READ, ubuf, sizeof(*ubuf)))
172 return -EFAULT;
173
174 switch (_NSIG_WORDS) {
175 default:
176 __get_sigset_unknown_nsig();
177 case 2:
178 err |= __get_user (sig[3], &ubuf->sig[3]);
179 err |= __get_user (sig[2], &ubuf->sig[2]);
180 kbuf->sig[1] = sig[2] | (sig[3] << 32);
181 case 1:
182 err |= __get_user (sig[1], &ubuf->sig[1]);
183 err |= __get_user (sig[0], &ubuf->sig[0]);
184 kbuf->sig[0] = sig[0] | (sig[1] << 32);
185 }
186
187 return err;
188 }
189
190 /*
191 * Atomically swap in the new signal mask, and wait for a signal.
192 */
193
194 save_static_function(sys32_sigsuspend);
195 __attribute_used__ noinline static int
196 _sys32_sigsuspend(nabi_no_regargs struct pt_regs regs)
197 {
198 compat_sigset_t *uset;
199 sigset_t newset;
200
201 uset = (compat_sigset_t *) regs.regs[4];
202 if (get_sigset(&newset, uset))
203 return -EFAULT;
204 sigdelsetmask(&newset, ~_BLOCKABLE);
205
206 spin_lock_irq(&current->sighand->siglock);
207 current->saved_sigmask = current->blocked;
208 current->blocked = newset;
209 recalc_sigpending();
210 spin_unlock_irq(&current->sighand->siglock);
211
212 current->state = TASK_INTERRUPTIBLE;
213 schedule();
214 set_thread_flag(TIF_RESTORE_SIGMASK);
215 return -ERESTARTNOHAND;
216 }
217
218 save_static_function(sys32_rt_sigsuspend);
219 __attribute_used__ noinline static int
220 _sys32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
221 {
222 compat_sigset_t *uset;
223 sigset_t newset;
224 size_t sigsetsize;
225
226 /* XXX Don't preclude handling different sized sigset_t's. */
227 sigsetsize = regs.regs[5];
228 if (sigsetsize != sizeof(compat_sigset_t))
229 return -EINVAL;
230
231 uset = (compat_sigset_t *) regs.regs[4];
232 if (get_sigset(&newset, uset))
233 return -EFAULT;
234 sigdelsetmask(&newset, ~_BLOCKABLE);
235
236 spin_lock_irq(&current->sighand->siglock);
237 current->saved_sigmask = current->blocked;
238 current->blocked = newset;
239 recalc_sigpending();
240 spin_unlock_irq(&current->sighand->siglock);
241
242 current->state = TASK_INTERRUPTIBLE;
243 schedule();
244 set_thread_flag(TIF_RESTORE_SIGMASK);
245 return -ERESTARTNOHAND;
246 }
247
248 asmlinkage int sys32_sigaction(int sig, const struct sigaction32 *act,
249 struct sigaction32 *oact)
250 {
251 struct k_sigaction new_ka, old_ka;
252 int ret;
253 int err = 0;
254
255 if (act) {
256 old_sigset_t mask;
257 s32 handler;
258
259 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
260 return -EFAULT;
261 err |= __get_user(handler, &act->sa_handler);
262 new_ka.sa.sa_handler = (void __user *)(s64)handler;
263 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
264 err |= __get_user(mask, &act->sa_mask.sig[0]);
265 if (err)
266 return -EFAULT;
267
268 siginitset(&new_ka.sa.sa_mask, mask);
269 }
270
271 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
272
273 if (!ret && oact) {
274 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
275 return -EFAULT;
276 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
277 err |= __put_user((u32)(u64)old_ka.sa.sa_handler,
278 &oact->sa_handler);
279 err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
280 err |= __put_user(0, &oact->sa_mask.sig[1]);
281 err |= __put_user(0, &oact->sa_mask.sig[2]);
282 err |= __put_user(0, &oact->sa_mask.sig[3]);
283 if (err)
284 return -EFAULT;
285 }
286
287 return ret;
288 }
289
290 asmlinkage int sys32_sigaltstack(nabi_no_regargs struct pt_regs regs)
291 {
292 const stack32_t __user *uss = (const stack32_t __user *) regs.regs[4];
293 stack32_t __user *uoss = (stack32_t __user *) regs.regs[5];
294 unsigned long usp = regs.regs[29];
295 stack_t kss, koss;
296 int ret, err = 0;
297 mm_segment_t old_fs = get_fs();
298 s32 sp;
299
300 if (uss) {
301 if (!access_ok(VERIFY_READ, uss, sizeof(*uss)))
302 return -EFAULT;
303 err |= __get_user(sp, &uss->ss_sp);
304 kss.ss_sp = (void *) (long) sp;
305 err |= __get_user(kss.ss_size, &uss->ss_size);
306 err |= __get_user(kss.ss_flags, &uss->ss_flags);
307 if (err)
308 return -EFAULT;
309 }
310
311 set_fs (KERNEL_DS);
312 ret = do_sigaltstack(uss ? (stack_t __user *)&kss : NULL,
313 uoss ? (stack_t __user *)&koss : NULL, usp);
314 set_fs (old_fs);
315
316 if (!ret && uoss) {
317 if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss)))
318 return -EFAULT;
319 sp = (int) (long) koss.ss_sp;
320 err |= __put_user(sp, &uoss->ss_sp);
321 err |= __put_user(koss.ss_size, &uoss->ss_size);
322 err |= __put_user(koss.ss_flags, &uoss->ss_flags);
323 if (err)
324 return -EFAULT;
325 }
326 return ret;
327 }
328
329 static int restore_sigcontext32(struct pt_regs *regs, struct sigcontext32 __user *sc)
330 {
331 u32 used_math;
332 int err = 0;
333 s32 treg;
334
335 /* Always make any pending restarted system calls return -EINTR */
336 current_thread_info()->restart_block.fn = do_no_restart_syscall;
337
338 err |= __get_user(regs->cp0_epc, &sc->sc_pc);
339 err |= __get_user(regs->hi, &sc->sc_mdhi);
340 err |= __get_user(regs->lo, &sc->sc_mdlo);
341 if (cpu_has_dsp) {
342 err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
343 err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
344 err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
345 err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
346 err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
347 err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
348 err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
349 }
350
351 #define restore_gp_reg(i) do { \
352 err |= __get_user(regs->regs[i], &sc->sc_regs[i]); \
353 } while(0)
354 restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3);
355 restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6);
356 restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9);
357 restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12);
358 restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15);
359 restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18);
360 restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21);
361 restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24);
362 restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27);
363 restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30);
364 restore_gp_reg(31);
365 #undef restore_gp_reg
366
367 err |= __get_user(used_math, &sc->sc_used_math);
368 conditional_used_math(used_math);
369
370 preempt_disable();
371
372 if (used_math()) {
373 /* restore fpu context if we have used it before */
374 own_fpu();
375 err |= restore_fp_context32(sc);
376 } else {
377 /* signal handler may have used FPU. Give it up. */
378 lose_fpu();
379 }
380
381 preempt_enable();
382
383 return err;
384 }
385
386 struct sigframe {
387 u32 sf_ass[4]; /* argument save space for o32 */
388 #if ICACHE_REFILLS_WORKAROUND_WAR
389 u32 sf_pad[2];
390 #else
391 u32 sf_code[2]; /* signal trampoline */
392 #endif
393 struct sigcontext32 sf_sc;
394 sigset_t sf_mask;
395 #if ICACHE_REFILLS_WORKAROUND_WAR
396 u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */
397 #endif
398 };
399
400 struct rt_sigframe32 {
401 u32 rs_ass[4]; /* argument save space for o32 */
402 #if ICACHE_REFILLS_WORKAROUND_WAR
403 u32 rs_pad[2];
404 #else
405 u32 rs_code[2]; /* signal trampoline */
406 #endif
407 compat_siginfo_t rs_info;
408 struct ucontext32 rs_uc;
409 #if ICACHE_REFILLS_WORKAROUND_WAR
410 u32 rs_code[8] __attribute__((aligned(32))); /* signal trampoline */
411 #endif
412 };
413
414 int 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
466 save_static_function(sys32_sigreturn);
467 __attribute_used__ noinline static void
468 _sys32_sigreturn(nabi_no_regargs struct pt_regs regs)
469 {
470 struct sigframe __user *frame;
471 sigset_t blocked;
472
473 frame = (struct sigframe __user *) regs.regs[29];
474 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
475 goto badframe;
476 if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked)))
477 goto badframe;
478
479 sigdelsetmask(&blocked, ~_BLOCKABLE);
480 spin_lock_irq(&current->sighand->siglock);
481 current->blocked = blocked;
482 recalc_sigpending();
483 spin_unlock_irq(&current->sighand->siglock);
484
485 if (restore_sigcontext32(&regs, &frame->sf_sc))
486 goto badframe;
487
488 /*
489 * Don't let your children do this ...
490 */
491 __asm__ __volatile__(
492 "move\t$29, %0\n\t"
493 "j\tsyscall_exit"
494 :/* no outputs */
495 :"r" (&regs));
496 /* Unreached */
497
498 badframe:
499 force_sig(SIGSEGV, current);
500 }
501
502 save_static_function(sys32_rt_sigreturn);
503 __attribute_used__ noinline static void
504 _sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
505 {
506 struct rt_sigframe32 __user *frame;
507 mm_segment_t old_fs;
508 sigset_t set;
509 stack_t st;
510 s32 sp;
511
512 frame = (struct rt_sigframe32 __user *) regs.regs[29];
513 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
514 goto badframe;
515 if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
516 goto badframe;
517
518 sigdelsetmask(&set, ~_BLOCKABLE);
519 spin_lock_irq(&current->sighand->siglock);
520 current->blocked = set;
521 recalc_sigpending();
522 spin_unlock_irq(&current->sighand->siglock);
523
524 if (restore_sigcontext32(&regs, &frame->rs_uc.uc_mcontext))
525 goto badframe;
526
527 /* The ucontext contains a stack32_t, so we must convert! */
528 if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp))
529 goto badframe;
530 st.ss_sp = (void *)(long) sp;
531 if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size))
532 goto badframe;
533 if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags))
534 goto badframe;
535
536 /* It is more difficult to avoid calling this function than to
537 call it and ignore errors. */
538 old_fs = get_fs();
539 set_fs (KERNEL_DS);
540 do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]);
541 set_fs (old_fs);
542
543 /*
544 * Don't let your children do this ...
545 */
546 __asm__ __volatile__(
547 "move\t$29, %0\n\t"
548 "j\tsyscall_exit"
549 :/* no outputs */
550 :"r" (&regs));
551 /* Unreached */
552
553 badframe:
554 force_sig(SIGSEGV, current);
555 }
556
557 static inline int setup_sigcontext32(struct pt_regs *regs,
558 struct sigcontext32 __user *sc)
559 {
560 int err = 0;
561
562 err |= __put_user(regs->cp0_epc, &sc->sc_pc);
563 err |= __put_user(regs->cp0_status, &sc->sc_status);
564
565 #define save_gp_reg(i) { \
566 err |= __put_user(regs->regs[i], &sc->sc_regs[i]); \
567 } while(0)
568 __put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2);
569 save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6);
570 save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10);
571 save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14);
572 save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18);
573 save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22);
574 save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26);
575 save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30);
576 save_gp_reg(31);
577 #undef save_gp_reg
578
579 err |= __put_user(regs->hi, &sc->sc_mdhi);
580 err |= __put_user(regs->lo, &sc->sc_mdlo);
581 if (cpu_has_dsp) {
582 err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
583 err |= __put_user(mfhi1(), &sc->sc_hi1);
584 err |= __put_user(mflo1(), &sc->sc_lo1);
585 err |= __put_user(mfhi2(), &sc->sc_hi2);
586 err |= __put_user(mflo2(), &sc->sc_lo2);
587 err |= __put_user(mfhi3(), &sc->sc_hi3);
588 err |= __put_user(mflo3(), &sc->sc_lo3);
589 }
590
591 err |= __put_user(!!used_math(), &sc->sc_used_math);
592
593 if (!used_math())
594 goto out;
595
596 /*
597 * Save FPU state to signal context. Signal handler will "inherit"
598 * current FPU state.
599 */
600 preempt_disable();
601
602 if (!is_fpu_owner()) {
603 own_fpu();
604 restore_fp(current);
605 }
606 err |= save_fp_context32(sc);
607
608 preempt_enable();
609
610 out:
611 return err;
612 }
613
614 /*
615 * Determine which stack to use..
616 */
617 static inline void __user *get_sigframe(struct k_sigaction *ka,
618 struct pt_regs *regs,
619 size_t frame_size)
620 {
621 unsigned long sp;
622
623 /* Default to using normal stack */
624 sp = regs->regs[29];
625
626 /*
627 * FPU emulator may have it's own trampoline active just
628 * above the user stack, 16-bytes before the next lowest
629 * 16 byte boundary. Try to avoid trashing it.
630 */
631 sp -= 32;
632
633 /* This is the X/Open sanctioned signal stack switching. */
634 if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
635 sp = current->sas_ss_sp + current->sas_ss_size;
636
637 return (void __user *)((sp - frame_size) & ALMASK);
638 }
639
640 int setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
641 int signr, sigset_t *set)
642 {
643 struct sigframe __user *frame;
644 int err = 0;
645
646 frame = get_sigframe(ka, regs, sizeof(*frame));
647 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
648 goto give_sigsegv;
649
650 /*
651 * Set up the return code ...
652 *
653 * li v0, __NR_O32_sigreturn
654 * syscall
655 */
656 err |= __put_user(0x24020000 + __NR_O32_sigreturn, frame->sf_code + 0);
657 err |= __put_user(0x0000000c , frame->sf_code + 1);
658 flush_cache_sigtramp((unsigned long) frame->sf_code);
659
660 err |= setup_sigcontext32(regs, &frame->sf_sc);
661 err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
662 if (err)
663 goto give_sigsegv;
664
665 /*
666 * Arguments to signal handler:
667 *
668 * a0 = signal number
669 * a1 = 0 (should be cause)
670 * a2 = pointer to struct sigcontext
671 *
672 * $25 and c0_epc point to the signal handler, $29 points to the
673 * struct sigframe.
674 */
675 regs->regs[ 4] = signr;
676 regs->regs[ 5] = 0;
677 regs->regs[ 6] = (unsigned long) &frame->sf_sc;
678 regs->regs[29] = (unsigned long) frame;
679 regs->regs[31] = (unsigned long) frame->sf_code;
680 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
681
682 #if DEBUG_SIG
683 printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
684 current->comm, current->pid,
685 frame, regs->cp0_epc, frame->sf_code);
686 #endif
687 return 0;
688
689 give_sigsegv:
690 force_sigsegv(signr, current);
691 return -EFAULT;
692 }
693
694 int setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
695 int signr, sigset_t *set, siginfo_t *info)
696 {
697 struct rt_sigframe32 __user *frame;
698 int err = 0;
699 s32 sp;
700
701 frame = get_sigframe(ka, regs, sizeof(*frame));
702 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
703 goto give_sigsegv;
704
705 /* Set up to return from userspace. If provided, use a stub already
706 in userspace. */
707 /*
708 * Set up the return code ...
709 *
710 * li v0, __NR_O32_rt_sigreturn
711 * syscall
712 */
713 err |= __put_user(0x24020000 + __NR_O32_rt_sigreturn, frame->rs_code + 0);
714 err |= __put_user(0x0000000c , frame->rs_code + 1);
715 flush_cache_sigtramp((unsigned long) frame->rs_code);
716
717 /* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */
718 err |= copy_siginfo_to_user32(&frame->rs_info, info);
719
720 /* Create the ucontext. */
721 err |= __put_user(0, &frame->rs_uc.uc_flags);
722 err |= __put_user(0, &frame->rs_uc.uc_link);
723 sp = (int) (long) current->sas_ss_sp;
724 err |= __put_user(sp,
725 &frame->rs_uc.uc_stack.ss_sp);
726 err |= __put_user(sas_ss_flags(regs->regs[29]),
727 &frame->rs_uc.uc_stack.ss_flags);
728 err |= __put_user(current->sas_ss_size,
729 &frame->rs_uc.uc_stack.ss_size);
730 err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext);
731 err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
732
733 if (err)
734 goto give_sigsegv;
735
736 /*
737 * Arguments to signal handler:
738 *
739 * a0 = signal number
740 * a1 = 0 (should be cause)
741 * a2 = pointer to ucontext
742 *
743 * $25 and c0_epc point to the signal handler, $29 points to
744 * the struct rt_sigframe32.
745 */
746 regs->regs[ 4] = signr;
747 regs->regs[ 5] = (unsigned long) &frame->rs_info;
748 regs->regs[ 6] = (unsigned long) &frame->rs_uc;
749 regs->regs[29] = (unsigned long) frame;
750 regs->regs[31] = (unsigned long) frame->rs_code;
751 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
752
753 #if DEBUG_SIG
754 printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
755 current->comm, current->pid,
756 frame, regs->cp0_epc, frame->rs_code);
757 #endif
758 return 0;
759
760 give_sigsegv:
761 force_sigsegv(signr, current);
762 return -EFAULT;
763 }
764
765 static inline int handle_signal(unsigned long sig, siginfo_t *info,
766 struct k_sigaction *ka, sigset_t *oldset, struct pt_regs * regs)
767 {
768 int ret;
769
770 switch (regs->regs[0]) {
771 case ERESTART_RESTARTBLOCK:
772 case ERESTARTNOHAND:
773 regs->regs[2] = EINTR;
774 break;
775 case ERESTARTSYS:
776 if (!(ka->sa.sa_flags & SA_RESTART)) {
777 regs->regs[2] = EINTR;
778 break;
779 }
780 /* fallthrough */
781 case ERESTARTNOINTR: /* Userland will reload $v0. */
782 regs->regs[7] = regs->regs[26];
783 regs->cp0_epc -= 8;
784 }
785
786 regs->regs[0] = 0; /* Don't deal with this again. */
787
788 if (ka->sa.sa_flags & SA_SIGINFO)
789 ret = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info);
790 else
791 ret = current->thread.abi->setup_frame(ka, regs, sig, oldset);
792
793 spin_lock_irq(&current->sighand->siglock);
794 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
795 if (!(ka->sa.sa_flags & SA_NODEFER))
796 sigaddset(&current->blocked,sig);
797 recalc_sigpending();
798 spin_unlock_irq(&current->sighand->siglock);
799
800 return ret;
801 }
802
803 int do_signal32(struct pt_regs *regs)
804 {
805 struct k_sigaction ka;
806 sigset_t *oldset;
807 siginfo_t info;
808 int signr;
809
810 /*
811 * We want the common case to go fast, which is why we may in certain
812 * cases get here from kernel mode. Just return without doing anything
813 * if so.
814 */
815 if (!user_mode(regs))
816 return 1;
817
818 if (try_to_freeze())
819 goto no_signal;
820
821 if (test_thread_flag(TIF_RESTORE_SIGMASK))
822 oldset = &current->saved_sigmask;
823 else
824 oldset = &current->blocked;
825
826 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
827 if (signr > 0) {
828 /* Whee! Actually deliver the signal. */
829 if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
830 /*
831 * A signal was successfully delivered; the saved
832 * sigmask will have been stored in the signal frame,
833 * and will be restored by sigreturn, so we can simply
834 * clear the TIF_RESTORE_SIGMASK flag.
835 */
836 if (test_thread_flag(TIF_RESTORE_SIGMASK))
837 clear_thread_flag(TIF_RESTORE_SIGMASK);
838 }
839 }
840
841 no_signal:
842 /*
843 * Who's code doesn't conform to the restartable syscall convention
844 * dies here!!! The li instruction, a single machine instruction,
845 * must directly be followed by the syscall instruction.
846 */
847 if (regs->regs[0]) {
848 if (regs->regs[2] == ERESTARTNOHAND ||
849 regs->regs[2] == ERESTARTSYS ||
850 regs->regs[2] == ERESTARTNOINTR) {
851 regs->regs[7] = regs->regs[26];
852 regs->cp0_epc -= 8;
853 }
854 if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
855 regs->regs[2] = __NR_O32_restart_syscall;
856 regs->regs[7] = regs->regs[26];
857 regs->cp0_epc -= 4;
858 }
859 }
860
861 /*
862 * If there's no signal to deliver, we just put the saved sigmask
863 * back
864 */
865 if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
866 clear_thread_flag(TIF_RESTORE_SIGMASK);
867 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
868 }
869
870 return 0;
871 }
872
873 asmlinkage int sys32_rt_sigaction(int sig, const struct sigaction32 *act,
874 struct sigaction32 __user *oact,
875 unsigned int sigsetsize)
876 {
877 struct k_sigaction new_sa, old_sa;
878 int ret = -EINVAL;
879
880 /* XXX: Don't preclude handling different sized sigset_t's. */
881 if (sigsetsize != sizeof(sigset_t))
882 goto out;
883
884 if (act) {
885 s32 handler;
886 int err = 0;
887
888 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
889 return -EFAULT;
890 err |= __get_user(handler, &act->sa_handler);
891 new_sa.sa.sa_handler = (void __user *)(s64)handler;
892 err |= __get_user(new_sa.sa.sa_flags, &act->sa_flags);
893 err |= get_sigset(&new_sa.sa.sa_mask, &act->sa_mask);
894 if (err)
895 return -EFAULT;
896 }
897
898 ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL);
899
900 if (!ret && oact) {
901 int err = 0;
902
903 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
904 return -EFAULT;
905
906 err |= __put_user((u32)(u64)old_sa.sa.sa_handler,
907 &oact->sa_handler);
908 err |= __put_user(old_sa.sa.sa_flags, &oact->sa_flags);
909 err |= put_sigset(&old_sa.sa.sa_mask, &oact->sa_mask);
910 if (err)
911 return -EFAULT;
912 }
913 out:
914 return ret;
915 }
916
917 asmlinkage int sys32_rt_sigprocmask(int how, compat_sigset_t *set,
918 compat_sigset_t __user *oset, unsigned int sigsetsize)
919 {
920 sigset_t old_set, new_set;
921 int ret;
922 mm_segment_t old_fs = get_fs();
923
924 if (set && get_sigset(&new_set, set))
925 return -EFAULT;
926
927 set_fs (KERNEL_DS);
928 ret = sys_rt_sigprocmask(how, set ? (sigset_t __user *)&new_set : NULL,
929 oset ? (sigset_t __user *)&old_set : NULL,
930 sigsetsize);
931 set_fs (old_fs);
932
933 if (!ret && oset && put_sigset(&old_set, oset))
934 return -EFAULT;
935
936 return ret;
937 }
938
939 asmlinkage int sys32_rt_sigpending(compat_sigset_t __user *uset,
940 unsigned int sigsetsize)
941 {
942 int ret;
943 sigset_t set;
944 mm_segment_t old_fs = get_fs();
945
946 set_fs (KERNEL_DS);
947 ret = sys_rt_sigpending((sigset_t __user *)&set, sigsetsize);
948 set_fs (old_fs);
949
950 if (!ret && put_sigset(&set, uset))
951 return -EFAULT;
952
953 return ret;
954 }
955
956 asmlinkage int sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
957 {
958 siginfo_t info;
959 int ret;
960 mm_segment_t old_fs = get_fs();
961
962 if (copy_from_user (&info, uinfo, 3*sizeof(int)) ||
963 copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE))
964 return -EFAULT;
965 set_fs (KERNEL_DS);
966 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *)&info);
967 set_fs (old_fs);
968 return ret;
969 }
970
971 asmlinkage long
972 sys32_waitid(int which, compat_pid_t pid,
973 compat_siginfo_t __user *uinfo, int options,
974 struct compat_rusage __user *uru)
975 {
976 siginfo_t info;
977 struct rusage ru;
978 long ret;
979 mm_segment_t old_fs = get_fs();
980
981 info.si_signo = 0;
982 set_fs (KERNEL_DS);
983 ret = sys_waitid(which, pid, (siginfo_t __user *) &info, options,
984 uru ? (struct rusage __user *) &ru : NULL);
985 set_fs (old_fs);
986
987 if (ret < 0 || info.si_signo == 0)
988 return ret;
989
990 if (uru && (ret = put_compat_rusage(&ru, uru)))
991 return ret;
992
993 BUG_ON(info.si_code & __SI_MASK);
994 info.si_code |= __SI_CHLD;
995 return copy_siginfo_to_user32(uinfo, &info);
996 }
Support for the Chinese Samsung S3C2440 based development boards