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
6 * Copyright (C) 1991, 1992 Linus Torvalds
7 * Copyright (C) 1994 - 2000 Ralf Baechle
8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
10 #include <linux/config.h>
11 #include <linux/sched.h>
13 #include <linux/personality.h>
14 #include <linux/smp.h>
15 #include <linux/smp_lock.h>
16 #include <linux/kernel.h>
17 #include <linux/signal.h>
18 #include <linux/errno.h>
19 #include <linux/wait.h>
20 #include <linux/ptrace.h>
21 #include <linux/unistd.h>
22 #include <linux/compiler.h>
25 #include <linux/bitops.h>
26 #include <asm/cacheflush.h>
29 #include <asm/uaccess.h>
30 #include <asm/ucontext.h>
34 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
36 extern asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs);
39 * Atomically swap in the new signal mask, and wait for a signal.
42 #ifdef CONFIG_TRAD_SIGNALS
43 save_static_function(sys_sigsuspend);
44 __attribute_used__ noinline static int
45 _sys_sigsuspend(nabi_no_regargs struct pt_regs regs)
47 sigset_t *uset, saveset, newset;
49 uset = (sigset_t *) regs.regs[4];
50 if (copy_from_user(&newset, uset, sizeof(sigset_t)))
52 sigdelsetmask(&newset, ~_BLOCKABLE);
54 spin_lock_irq(¤t->sighand->siglock);
55 saveset = current->blocked;
56 current->blocked = newset;
58 spin_unlock_irq(¤t->sighand->siglock);
63 current->state = TASK_INTERRUPTIBLE;
65 if (do_signal(&saveset, ®s))
71 save_static_function(sys_rt_sigsuspend);
72 __attribute_used__ noinline static int
73 _sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
75 sigset_t *unewset, saveset, newset;
78 /* XXX Don't preclude handling different sized sigset_t's. */
79 sigsetsize = regs.regs[5];
80 if (sigsetsize != sizeof(sigset_t))
83 unewset = (sigset_t *) regs.regs[4];
84 if (copy_from_user(&newset, unewset, sizeof(newset)))
86 sigdelsetmask(&newset, ~_BLOCKABLE);
88 spin_lock_irq(¤t->sighand->siglock);
89 saveset = current->blocked;
90 current->blocked = newset;
92 spin_unlock_irq(¤t->sighand->siglock);
97 current->state = TASK_INTERRUPTIBLE;
99 if (do_signal(&saveset, ®s))
104 #ifdef CONFIG_TRAD_SIGNALS
105 asmlinkage int sys_sigaction(int sig, const struct sigaction *act,
106 struct sigaction *oact)
108 struct k_sigaction new_ka, old_ka;
115 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
117 err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler);
118 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
119 err |= __get_user(mask, &act->sa_mask.sig[0]);
123 siginitset(&new_ka.sa.sa_mask, mask);
126 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
129 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
131 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
132 err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
133 err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
134 err |= __put_user(0, &oact->sa_mask.sig[1]);
135 err |= __put_user(0, &oact->sa_mask.sig[2]);
136 err |= __put_user(0, &oact->sa_mask.sig[3]);
145 asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs)
147 const stack_t *uss = (const stack_t *) regs.regs[4];
148 stack_t *uoss = (stack_t *) regs.regs[5];
149 unsigned long usp = regs.regs[29];
151 return do_sigaltstack(uss, uoss, usp);
154 asmlinkage int restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
158 /* Always make any pending restarted system calls return -EINTR */
159 current_thread_info()->restart_block.fn = do_no_restart_syscall;
161 err |= __get_user(regs->cp0_epc, &sc->sc_pc);
162 err |= __get_user(regs->hi, &sc->sc_mdhi);
163 err |= __get_user(regs->lo, &sc->sc_mdlo);
165 #define restore_gp_reg(i) do { \
166 err |= __get_user(regs->regs[i], &sc->sc_regs[i]); \
168 restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3);
169 restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6);
170 restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9);
171 restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12);
172 restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15);
173 restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18);
174 restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21);
175 restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24);
176 restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27);
177 restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30);
179 #undef restore_gp_reg
181 err |= __get_user(current->used_math, &sc->sc_used_math);
185 if (current->used_math) {
186 /* restore fpu context if we have used it before */
188 err |= restore_fp_context(sc);
190 /* signal handler may have used FPU. Give it up. */
199 #if PLAT_TRAMPOLINE_STUFF_LINE
200 #define __tramp __attribute__((aligned(PLAT_TRAMPOLINE_STUFF_LINE)))
205 #ifdef CONFIG_TRAD_SIGNALS
207 u32 sf_ass[4]; /* argument save space for o32 */
208 u32 sf_code[2] __tramp; /* signal trampoline */
209 struct sigcontext sf_sc __tramp;
215 u32 rs_ass[4]; /* argument save space for o32 */
216 u32 rs_code[2] __tramp; /* signal trampoline */
217 struct siginfo rs_info __tramp;
218 struct ucontext rs_uc;
221 #ifdef CONFIG_TRAD_SIGNALS
222 asmlinkage void sys_sigreturn(struct pt_regs regs)
224 struct sigframe *frame;
227 frame = (struct sigframe *) regs.regs[29];
228 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
230 if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked)))
233 sigdelsetmask(&blocked, ~_BLOCKABLE);
234 spin_lock_irq(¤t->sighand->siglock);
235 current->blocked = blocked;
237 spin_unlock_irq(¤t->sighand->siglock);
239 if (restore_sigcontext(®s, &frame->sf_sc))
243 * Don't let your children do this ...
245 if (current_thread_info()->flags & TIF_SYSCALL_TRACE)
246 do_syscall_trace(®s, 1);
247 __asm__ __volatile__(
255 force_sig(SIGSEGV, current);
259 asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
261 struct rt_sigframe *frame;
265 frame = (struct rt_sigframe *) regs.regs[29];
266 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
268 if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
271 sigdelsetmask(&set, ~_BLOCKABLE);
272 spin_lock_irq(¤t->sighand->siglock);
273 current->blocked = set;
275 spin_unlock_irq(¤t->sighand->siglock);
277 if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext))
280 if (__copy_from_user(&st, &frame->rs_uc.uc_stack, sizeof(st)))
282 /* It is more difficult to avoid calling this function than to
283 call it and ignore errors. */
284 do_sigaltstack(&st, NULL, regs.regs[29]);
287 * Don't let your children do this ...
289 __asm__ __volatile__(
297 force_sig(SIGSEGV, current);
300 inline int setup_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
304 err |= __put_user(regs->cp0_epc, &sc->sc_pc);
305 err |= __put_user(regs->cp0_status, &sc->sc_status);
307 #define save_gp_reg(i) do { \
308 err |= __put_user(regs->regs[i], &sc->sc_regs[i]); \
310 __put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2);
311 save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6);
312 save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10);
313 save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14);
314 save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18);
315 save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22);
316 save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26);
317 save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30);
321 err |= __put_user(regs->hi, &sc->sc_mdhi);
322 err |= __put_user(regs->lo, &sc->sc_mdlo);
323 err |= __put_user(regs->cp0_cause, &sc->sc_cause);
324 err |= __put_user(regs->cp0_badvaddr, &sc->sc_badvaddr);
326 err |= __put_user(current->used_math, &sc->sc_used_math);
328 if (!current->used_math)
332 * Save FPU state to signal context. Signal handler will "inherit"
337 if (!is_fpu_owner()) {
341 err |= save_fp_context(sc);
350 * Determine which stack to use..
352 static inline void *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
355 unsigned long sp, almask;
357 /* Default to using normal stack */
361 * FPU emulator may have it's own trampoline active just
362 * above the user stack, 16-bytes before the next lowest
363 * 16 byte boundary. Try to avoid trashing it.
367 /* This is the X/Open sanctioned signal stack switching. */
368 if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
369 sp = current->sas_ss_sp + current->sas_ss_size;
371 if (PLAT_TRAMPOLINE_STUFF_LINE)
372 almask = ~(PLAT_TRAMPOLINE_STUFF_LINE - 1);
376 return (void *)((sp - frame_size) & ~(PLAT_TRAMPOLINE_STUFF_LINE - 1));
379 #ifdef CONFIG_TRAD_SIGNALS
380 static void inline setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
381 int signr, sigset_t *set)
383 struct sigframe *frame;
386 frame = get_sigframe(ka, regs, sizeof(*frame));
387 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
391 * Set up the return code ...
393 * li v0, __NR_sigreturn
396 if (PLAT_TRAMPOLINE_STUFF_LINE)
397 __builtin_memset(frame->sf_code, '0',
398 PLAT_TRAMPOLINE_STUFF_LINE);
399 err |= __put_user(0x24020000 + __NR_sigreturn, frame->sf_code + 0);
400 err |= __put_user(0x0000000c , frame->sf_code + 1);
401 flush_cache_sigtramp((unsigned long) frame->sf_code);
403 err |= setup_sigcontext(regs, &frame->sf_sc);
404 err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
409 * Arguments to signal handler:
412 * a1 = 0 (should be cause)
413 * a2 = pointer to struct sigcontext
415 * $25 and c0_epc point to the signal handler, $29 points to the
418 regs->regs[ 4] = signr;
420 regs->regs[ 6] = (unsigned long) &frame->sf_sc;
421 regs->regs[29] = (unsigned long) frame;
422 regs->regs[31] = (unsigned long) frame->sf_code;
423 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
426 printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
427 current->comm, current->pid,
428 frame, regs->cp0_epc, frame->regs[31]);
433 force_sigsegv(signr, current);
437 static void inline setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
438 int signr, sigset_t *set, siginfo_t *info)
440 struct rt_sigframe *frame;
443 frame = get_sigframe(ka, regs, sizeof(*frame));
444 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
448 * Set up the return code ...
450 * li v0, __NR_rt_sigreturn
453 if (PLAT_TRAMPOLINE_STUFF_LINE)
454 __builtin_memset(frame->rs_code, '0',
455 PLAT_TRAMPOLINE_STUFF_LINE);
456 err |= __put_user(0x24020000 + __NR_rt_sigreturn, frame->rs_code + 0);
457 err |= __put_user(0x0000000c , frame->rs_code + 1);
458 flush_cache_sigtramp((unsigned long) frame->rs_code);
460 /* Create siginfo. */
461 err |= copy_siginfo_to_user(&frame->rs_info, info);
463 /* Create the ucontext. */
464 err |= __put_user(0, &frame->rs_uc.uc_flags);
465 err |= __put_user(0, &frame->rs_uc.uc_link);
466 err |= __put_user((void *)current->sas_ss_sp,
467 &frame->rs_uc.uc_stack.ss_sp);
468 err |= __put_user(sas_ss_flags(regs->regs[29]),
469 &frame->rs_uc.uc_stack.ss_flags);
470 err |= __put_user(current->sas_ss_size,
471 &frame->rs_uc.uc_stack.ss_size);
472 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
473 err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
479 * Arguments to signal handler:
482 * a1 = 0 (should be cause)
483 * a2 = pointer to ucontext
485 * $25 and c0_epc point to the signal handler, $29 points to
486 * the struct rt_sigframe.
488 regs->regs[ 4] = signr;
489 regs->regs[ 5] = (unsigned long) &frame->rs_info;
490 regs->regs[ 6] = (unsigned long) &frame->rs_uc;
491 regs->regs[29] = (unsigned long) frame;
492 regs->regs[31] = (unsigned long) frame->rs_code;
493 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
496 printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
497 current->comm, current->pid,
498 frame, regs->cp0_epc, regs->regs[31]);
503 force_sigsegv(signr, current);
506 extern void setup_rt_frame_n32(struct k_sigaction * ka,
507 struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info);
509 static inline void handle_signal(unsigned long sig, siginfo_t *info,
510 struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs)
512 switch(regs->regs[0]) {
513 case ERESTART_RESTARTBLOCK:
515 regs->regs[2] = EINTR;
518 if(!(ka->sa.sa_flags & SA_RESTART)) {
519 regs->regs[2] = EINTR;
523 case ERESTARTNOINTR: /* Userland will reload $v0. */
524 regs->regs[7] = regs->regs[26];
528 regs->regs[0] = 0; /* Don't deal with this again. */
530 #ifdef CONFIG_TRAD_SIGNALS
531 if (ka->sa.sa_flags & SA_SIGINFO) {
535 #ifdef CONFIG_MIPS32_N32
536 if ((current->thread.mflags & MF_ABI_MASK) == MF_N32)
537 setup_rt_frame_n32 (ka, regs, sig, oldset, info);
540 setup_rt_frame(ka, regs, sig, oldset, info);
542 #ifdef CONFIG_TRAD_SIGNALS
544 setup_frame(ka, regs, sig, oldset);
547 if (!(ka->sa.sa_flags & SA_NODEFER)) {
548 spin_lock_irq(¤t->sighand->siglock);
549 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
550 sigaddset(¤t->blocked,sig);
552 spin_unlock_irq(¤t->sighand->siglock);
556 extern int do_signal32(sigset_t *oldset, struct pt_regs *regs);
557 extern int do_irix_signal(sigset_t *oldset, struct pt_regs *regs);
559 asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs)
561 struct k_sigaction ka;
565 #ifdef CONFIG_BINFMT_ELF32
566 if ((current->thread.mflags & MF_ABI_MASK) == MF_O32) {
567 return do_signal32(oldset, regs);
572 * We want the common case to go fast, which is why we may in certain
573 * cases get here from kernel mode. Just return without doing anything
576 if (!user_mode(regs))
579 if (try_to_freeze(0))
583 oldset = ¤t->blocked;
585 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
587 handle_signal(signr, &info, &ka, oldset, regs);
593 * Who's code doesn't conform to the restartable syscall convention
594 * dies here!!! The li instruction, a single machine instruction,
595 * must directly be followed by the syscall instruction.
598 if (regs->regs[2] == ERESTARTNOHAND ||
599 regs->regs[2] == ERESTARTSYS ||
600 regs->regs[2] == ERESTARTNOINTR) {
601 regs->regs[7] = regs->regs[26];
604 if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
605 regs->regs[2] = __NR_restart_syscall;
606 regs->regs[7] = regs->regs[26];
613 extern int do_irix_signal(sigset_t *oldset, struct pt_regs *regs);
616 * notification of userspace execution resumption
617 * - triggered by current->work.notify_resume
619 asmlinkage void do_notify_resume(struct pt_regs *regs, sigset_t *oldset,
620 __u32 thread_info_flags)
622 /* deal with pending signal delivery */
623 if (thread_info_flags & _TIF_SIGPENDING) {
624 #ifdef CONFIG_BINFMT_ELF32
625 if (likely((current->thread.mflags & MF_ABI_MASK) == MF_O32)) {
626 do_signal32(oldset, regs);
630 #ifdef CONFIG_BINFMT_IRIX
631 if (unlikely(current->personality != PER_LINUX)) {
632 do_irix_signal(oldset, regs);
636 do_signal(oldset, regs);