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/suspend.h>
22 #include <linux/unistd.h>
25 #include <asm/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 static_unused int _sys_sigsuspend(struct pt_regs regs)
46 sigset_t *uset, saveset, newset;
48 uset = (sigset_t *) regs.regs[4];
49 if (copy_from_user(&newset, uset, sizeof(sigset_t)))
51 sigdelsetmask(&newset, ~_BLOCKABLE);
53 spin_lock_irq(¤t->sighand->siglock);
54 saveset = current->blocked;
55 current->blocked = newset;
57 spin_unlock_irq(¤t->sighand->siglock);
62 current->state = TASK_INTERRUPTIBLE;
64 if (do_signal(&saveset, ®s))
70 save_static_function(sys_rt_sigsuspend);
71 static_unused int _sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
73 sigset_t *unewset, saveset, newset;
76 /* XXX Don't preclude handling different sized sigset_t's. */
77 sigsetsize = regs.regs[5];
78 if (sigsetsize != sizeof(sigset_t))
81 unewset = (sigset_t *) regs.regs[4];
82 if (copy_from_user(&newset, unewset, sizeof(newset)))
84 sigdelsetmask(&newset, ~_BLOCKABLE);
86 spin_lock_irq(¤t->sighand->siglock);
87 saveset = current->blocked;
88 current->blocked = newset;
90 spin_unlock_irq(¤t->sighand->siglock);
95 current->state = TASK_INTERRUPTIBLE;
97 if (do_signal(&saveset, ®s))
102 #ifdef CONFIG_TRAD_SIGNALS
103 asmlinkage int sys_sigaction(int sig, const struct sigaction *act,
104 struct sigaction *oact)
106 struct k_sigaction new_ka, old_ka;
113 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
115 err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler);
116 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
117 err |= __get_user(mask, &act->sa_mask.sig[0]);
121 siginitset(&new_ka.sa.sa_mask, mask);
124 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
127 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
129 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
130 err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
131 err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
132 err |= __put_user(0, &oact->sa_mask.sig[1]);
133 err |= __put_user(0, &oact->sa_mask.sig[2]);
134 err |= __put_user(0, &oact->sa_mask.sig[3]);
143 asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs)
145 const stack_t *uss = (const stack_t *) regs.regs[4];
146 stack_t *uoss = (stack_t *) regs.regs[5];
147 unsigned long usp = regs.regs[29];
149 return do_sigaltstack(uss, uoss, usp);
152 asmlinkage int restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
156 /* Always make any pending restarted system calls return -EINTR */
157 current_thread_info()->restart_block.fn = do_no_restart_syscall;
159 err |= __get_user(regs->cp0_epc, &sc->sc_pc);
160 err |= __get_user(regs->hi, &sc->sc_mdhi);
161 err |= __get_user(regs->lo, &sc->sc_mdlo);
163 #define restore_gp_reg(i) do { \
164 err |= __get_user(regs->regs[i], &sc->sc_regs[i]); \
166 restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3);
167 restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6);
168 restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9);
169 restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12);
170 restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15);
171 restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18);
172 restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21);
173 restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24);
174 restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27);
175 restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30);
177 #undef restore_gp_reg
179 err |= __get_user(current->used_math, &sc->sc_used_math);
181 if (current->used_math) {
182 /* restore fpu context if we have used it before */
184 err |= restore_fp_context(sc);
186 /* signal handler may have used FPU. Give it up. */
193 #ifdef CONFIG_TRAD_SIGNALS
195 u32 sf_ass[4]; /* argument save space for o32 */
196 u32 sf_code[2]; /* signal trampoline */
197 struct sigcontext sf_sc;
203 u32 rs_ass[4]; /* argument save space for o32 */
204 u32 rs_code[2]; /* signal trampoline */
205 struct siginfo rs_info;
206 struct ucontext rs_uc;
209 #ifdef CONFIG_TRAD_SIGNALS
210 asmlinkage void sys_sigreturn(struct pt_regs regs)
212 struct sigframe *frame;
215 frame = (struct sigframe *) regs.regs[29];
216 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
218 if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked)))
221 sigdelsetmask(&blocked, ~_BLOCKABLE);
222 spin_lock_irq(¤t->sighand->siglock);
223 current->blocked = blocked;
225 spin_unlock_irq(¤t->sighand->siglock);
227 if (restore_sigcontext(®s, &frame->sf_sc))
231 * Don't let your children do this ...
233 if (current_thread_info()->flags & TIF_SYSCALL_TRACE)
234 do_syscall_trace(®s, 1);
235 __asm__ __volatile__(
243 force_sig(SIGSEGV, current);
247 asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
249 struct rt_sigframe *frame;
253 frame = (struct rt_sigframe *) regs.regs[29];
254 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
256 if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
259 sigdelsetmask(&set, ~_BLOCKABLE);
260 spin_lock_irq(¤t->sighand->siglock);
261 current->blocked = set;
263 spin_unlock_irq(¤t->sighand->siglock);
265 if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext))
268 if (__copy_from_user(&st, &frame->rs_uc.uc_stack, sizeof(st)))
270 /* It is more difficult to avoid calling this function than to
271 call it and ignore errors. */
272 do_sigaltstack(&st, NULL, regs.regs[29]);
275 * Don't let your children do this ...
277 __asm__ __volatile__(
285 force_sig(SIGSEGV, current);
288 inline int setup_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
292 err |= __put_user(regs->cp0_epc, &sc->sc_pc);
293 err |= __put_user(regs->cp0_status, &sc->sc_status);
295 #define save_gp_reg(i) do { \
296 err |= __put_user(regs->regs[i], &sc->sc_regs[i]); \
298 __put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2);
299 save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6);
300 save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10);
301 save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14);
302 save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18);
303 save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22);
304 save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26);
305 save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30);
309 err |= __put_user(regs->hi, &sc->sc_mdhi);
310 err |= __put_user(regs->lo, &sc->sc_mdlo);
311 err |= __put_user(regs->cp0_cause, &sc->sc_cause);
312 err |= __put_user(regs->cp0_badvaddr, &sc->sc_badvaddr);
314 err |= __put_user(current->used_math, &sc->sc_used_math);
316 if (!current->used_math)
320 * Save FPU state to signal context. Signal handler will "inherit"
323 if (!is_fpu_owner()) {
327 err |= save_fp_context(sc);
334 * Determine which stack to use..
336 static inline void *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
341 /* Default to using normal stack */
345 * FPU emulator may have it's own trampoline active just
346 * above the user stack, 16-bytes before the next lowest
347 * 16 byte boundary. Try to avoid trashing it.
351 /* This is the X/Open sanctioned signal stack switching. */
352 if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
353 sp = current->sas_ss_sp + current->sas_ss_size;
355 return (void *)((sp - frame_size) & ALMASK);
358 #ifdef CONFIG_TRAD_SIGNALS
359 static void inline setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
360 int signr, sigset_t *set)
362 struct sigframe *frame;
365 frame = get_sigframe(ka, regs, sizeof(*frame));
366 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
370 * Set up the return code ...
372 * li v0, __NR_sigreturn
375 err |= __put_user(0x24020000 + __NR_sigreturn, frame->sf_code + 0);
376 err |= __put_user(0x0000000c , frame->sf_code + 1);
377 flush_cache_sigtramp((unsigned long) frame->sf_code);
379 err |= setup_sigcontext(regs, &frame->sf_sc);
380 err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
385 * Arguments to signal handler:
388 * a1 = 0 (should be cause)
389 * a2 = pointer to struct sigcontext
391 * $25 and c0_epc point to the signal handler, $29 points to the
394 regs->regs[ 4] = signr;
396 regs->regs[ 6] = (unsigned long) &frame->sf_sc;
397 regs->regs[29] = (unsigned long) frame;
398 regs->regs[31] = (unsigned long) frame->sf_code;
399 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
402 printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
403 current->comm, current->pid,
404 frame, regs->cp0_epc, frame->regs[31]);
409 if (signr == SIGSEGV)
410 ka->sa.sa_handler = SIG_DFL;
411 force_sig(SIGSEGV, current);
415 static void inline setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
416 int signr, sigset_t *set, siginfo_t *info)
418 struct rt_sigframe *frame;
421 frame = get_sigframe(ka, regs, sizeof(*frame));
422 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
426 * Set up the return code ...
428 * li v0, __NR_rt_sigreturn
431 err |= __put_user(0x24020000 + __NR_rt_sigreturn, frame->rs_code + 0);
432 err |= __put_user(0x0000000c , frame->rs_code + 1);
433 flush_cache_sigtramp((unsigned long) frame->rs_code);
435 /* Create siginfo. */
436 err |= copy_siginfo_to_user(&frame->rs_info, info);
438 /* Create the ucontext. */
439 err |= __put_user(0, &frame->rs_uc.uc_flags);
440 err |= __put_user(0, &frame->rs_uc.uc_link);
441 err |= __put_user((void *)current->sas_ss_sp,
442 &frame->rs_uc.uc_stack.ss_sp);
443 err |= __put_user(sas_ss_flags(regs->regs[29]),
444 &frame->rs_uc.uc_stack.ss_flags);
445 err |= __put_user(current->sas_ss_size,
446 &frame->rs_uc.uc_stack.ss_size);
447 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
448 err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
454 * Arguments to signal handler:
457 * a1 = 0 (should be cause)
458 * a2 = pointer to ucontext
460 * $25 and c0_epc point to the signal handler, $29 points to
461 * the struct rt_sigframe.
463 regs->regs[ 4] = signr;
464 regs->regs[ 5] = (unsigned long) &frame->rs_info;
465 regs->regs[ 6] = (unsigned long) &frame->rs_uc;
466 regs->regs[29] = (unsigned long) frame;
467 regs->regs[31] = (unsigned long) frame->rs_code;
468 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
471 printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
472 current->comm, current->pid,
473 frame, regs->cp0_epc, regs->regs[31]);
478 if (signr == SIGSEGV)
479 ka->sa.sa_handler = SIG_DFL;
480 force_sig(SIGSEGV, current);
483 extern void setup_rt_frame_n32(struct k_sigaction * ka,
484 struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info);
486 static inline void handle_signal(unsigned long sig, siginfo_t *info,
487 sigset_t *oldset, struct pt_regs *regs)
489 struct k_sigaction *ka = ¤t->sighand->action[sig-1];
491 switch(regs->regs[0]) {
492 case ERESTART_RESTARTBLOCK:
494 regs->regs[2] = EINTR;
497 if(!(ka->sa.sa_flags & SA_RESTART)) {
498 regs->regs[2] = EINTR;
502 case ERESTARTNOINTR: /* Userland will reload $v0. */
503 regs->regs[7] = regs->regs[26];
507 regs->regs[0] = 0; /* Don't deal with this again. */
509 #ifdef CONFIG_TRAD_SIGNALS
510 if (ka->sa.sa_flags & SA_SIGINFO) {
514 #ifdef CONFIG_MIPS32_N32
515 if ((current->thread.mflags & MF_ABI_MASK) == MF_N32)
516 setup_rt_frame_n32 (ka, regs, sig, oldset, info);
519 setup_rt_frame(ka, regs, sig, oldset, info);
521 #ifdef CONFIG_TRAD_SIGNALS
523 setup_frame(ka, regs, sig, oldset);
526 if (ka->sa.sa_flags & SA_ONESHOT)
527 ka->sa.sa_handler = SIG_DFL;
528 if (!(ka->sa.sa_flags & SA_NODEFER)) {
529 spin_lock_irq(¤t->sighand->siglock);
530 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
531 sigaddset(¤t->blocked,sig);
533 spin_unlock_irq(¤t->sighand->siglock);
537 extern int do_signal32(sigset_t *oldset, struct pt_regs *regs);
538 extern int do_irix_signal(sigset_t *oldset, struct pt_regs *regs);
540 asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs)
545 #ifdef CONFIG_BINFMT_ELF32
546 if ((current->thread.mflags & MF_ABI_MASK) == MF_O32) {
547 return do_signal32(oldset, regs);
552 * We want the common case to go fast, which is why we may in certain
553 * cases get here from kernel mode. Just return without doing anything
556 if (!user_mode(regs))
559 if (current->flags & PF_FREEZE) {
565 oldset = ¤t->blocked;
567 signr = get_signal_to_deliver(&info, regs, NULL);
569 handle_signal(signr, &info, oldset, regs);
575 * Who's code doesn't conform to the restartable syscall convention
576 * dies here!!! The li instruction, a single machine instruction,
577 * must directly be followed by the syscall instruction.
580 if (regs->regs[2] == ERESTARTNOHAND ||
581 regs->regs[2] == ERESTARTSYS ||
582 regs->regs[2] == ERESTARTNOINTR) {
583 regs->regs[7] = regs->regs[26];
586 if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
587 regs->regs[2] = __NR_restart_syscall;
588 regs->regs[7] = regs->regs[26];
595 extern int do_irix_signal(sigset_t *oldset, struct pt_regs *regs);
598 * notification of userspace execution resumption
599 * - triggered by current->work.notify_resume
601 asmlinkage void do_notify_resume(struct pt_regs *regs, sigset_t *oldset,
602 __u32 thread_info_flags)
604 /* deal with pending signal delivery */
605 if (thread_info_flags & _TIF_SIGPENDING) {
606 #ifdef CONFIG_BINFMT_ELF32
607 if (likely((current->thread.mflags & MF_ABI_MASK) == MF_O32)) {
608 do_signal32(oldset, regs);
612 #ifdef CONFIG_BINFMT_IRIX
613 if (unlikely(current->personality != PER_LINUX)) {
614 do_irix_signal(oldset, regs);
618 do_signal(oldset, regs);