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>
24 #include <asm/bitops.h>
25 #include <asm/cacheflush.h>
28 #include <asm/uaccess.h>
29 #include <asm/ucontext.h>
33 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
35 extern asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs);
37 extern asmlinkage void do_syscall_trace(void);
40 * Atomically swap in the new signal mask, and wait for a signal.
43 #ifdef CONFIG_TRAD_SIGNALS
44 save_static_function(sys_sigsuspend);
45 static_unused int _sys_sigsuspend(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 static_unused int _sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
74 sigset_t *unewset, saveset, newset;
77 /* XXX Don't preclude handling different sized sigset_t's. */
78 sigsetsize = regs.regs[5];
79 if (sigsetsize != sizeof(sigset_t))
82 unewset = (sigset_t *) regs.regs[4];
83 if (copy_from_user(&newset, unewset, sizeof(newset)))
85 sigdelsetmask(&newset, ~_BLOCKABLE);
87 spin_lock_irq(¤t->sighand->siglock);
88 saveset = current->blocked;
89 current->blocked = newset;
91 spin_unlock_irq(¤t->sighand->siglock);
96 current->state = TASK_INTERRUPTIBLE;
98 if (do_signal(&saveset, ®s))
103 #ifdef CONFIG_TRAD_SIGNALS
104 asmlinkage int sys_sigaction(int sig, const struct sigaction *act,
105 struct sigaction *oact)
107 struct k_sigaction new_ka, old_ka;
114 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
116 err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler);
117 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
118 err |= __get_user(mask, &act->sa_mask.sig[0]);
122 siginitset(&new_ka.sa.sa_mask, mask);
125 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
128 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
130 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
131 err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
132 err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
133 err |= __put_user(0, &oact->sa_mask.sig[1]);
134 err |= __put_user(0, &oact->sa_mask.sig[2]);
135 err |= __put_user(0, &oact->sa_mask.sig[3]);
144 asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs)
146 const stack_t *uss = (const stack_t *) regs.regs[4];
147 stack_t *uoss = (stack_t *) regs.regs[5];
148 unsigned long usp = regs.regs[29];
150 return do_sigaltstack(uss, uoss, usp);
153 asmlinkage int restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
157 /* Always make any pending restarted system calls return -EINTR */
158 current_thread_info()->restart_block.fn = do_no_restart_syscall;
160 err |= __get_user(regs->cp0_epc, &sc->sc_pc);
161 err |= __get_user(regs->hi, &sc->sc_mdhi);
162 err |= __get_user(regs->lo, &sc->sc_mdlo);
164 #define restore_gp_reg(i) do { \
165 err |= __get_user(regs->regs[i], &sc->sc_regs[i]); \
167 restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3);
168 restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6);
169 restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9);
170 restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12);
171 restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15);
172 restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18);
173 restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21);
174 restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24);
175 restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27);
176 restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30);
178 #undef restore_gp_reg
180 err |= __get_user(current->used_math, &sc->sc_used_math);
182 if (current->used_math) {
183 /* restore fpu context if we have used it before */
185 err |= restore_fp_context(sc);
187 /* signal handler may have used FPU. Give it up. */
194 #ifdef CONFIG_TRAD_SIGNALS
196 u32 sf_ass[4]; /* argument save space for o32 */
197 u32 sf_code[2]; /* signal trampoline */
198 struct sigcontext sf_sc;
204 u32 rs_ass[4]; /* argument save space for o32 */
205 u32 rs_code[2]; /* signal trampoline */
206 struct siginfo rs_info;
207 struct ucontext rs_uc;
210 #ifdef CONFIG_TRAD_SIGNALS
211 asmlinkage void sys_sigreturn(struct pt_regs regs)
213 struct sigframe *frame;
216 frame = (struct sigframe *) regs.regs[29];
217 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
219 if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked)))
222 sigdelsetmask(&blocked, ~_BLOCKABLE);
223 spin_lock_irq(¤t->sighand->siglock);
224 current->blocked = blocked;
226 spin_unlock_irq(¤t->sighand->siglock);
228 if (restore_sigcontext(®s, &frame->sf_sc))
232 * Don't let your children do this ...
234 if (current_thread_info()->flags & TIF_SYSCALL_TRACE)
236 __asm__ __volatile__(
244 force_sig(SIGSEGV, current);
248 asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
250 struct rt_sigframe *frame;
254 frame = (struct rt_sigframe *) regs.regs[29];
255 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
257 if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
260 sigdelsetmask(&set, ~_BLOCKABLE);
261 spin_lock_irq(¤t->sighand->siglock);
262 current->blocked = set;
264 spin_unlock_irq(¤t->sighand->siglock);
266 if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext))
269 if (__copy_from_user(&st, &frame->rs_uc.uc_stack, sizeof(st)))
271 /* It is more difficult to avoid calling this function than to
272 call it and ignore errors. */
273 do_sigaltstack(&st, NULL, regs.regs[29]);
276 * Don't let your children do this ...
278 __asm__ __volatile__(
286 force_sig(SIGSEGV, current);
289 inline int setup_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
293 err |= __put_user(regs->cp0_epc, &sc->sc_pc);
294 err |= __put_user(regs->cp0_status, &sc->sc_status);
296 #define save_gp_reg(i) do { \
297 err |= __put_user(regs->regs[i], &sc->sc_regs[i]); \
299 __put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2);
300 save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6);
301 save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10);
302 save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14);
303 save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18);
304 save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22);
305 save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26);
306 save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30);
310 err |= __put_user(regs->hi, &sc->sc_mdhi);
311 err |= __put_user(regs->lo, &sc->sc_mdlo);
312 err |= __put_user(regs->cp0_cause, &sc->sc_cause);
313 err |= __put_user(regs->cp0_badvaddr, &sc->sc_badvaddr);
315 err |= __put_user(current->used_math, &sc->sc_used_math);
317 if (!current->used_math)
321 * Save FPU state to signal context. Signal handler will "inherit"
324 if (!is_fpu_owner()) {
328 err |= save_fp_context(sc);
335 * Determine which stack to use..
337 static inline void *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
342 /* Default to using normal stack */
346 * FPU emulator may have it's own trampoline active just
347 * above the user stack, 16-bytes before the next lowest
348 * 16 byte boundary. Try to avoid trashing it.
352 /* This is the X/Open sanctioned signal stack switching. */
353 if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
354 sp = current->sas_ss_sp + current->sas_ss_size;
356 return (void *)((sp - frame_size) & ALMASK);
359 #ifdef CONFIG_TRAD_SIGNALS
360 static void inline setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
361 int signr, sigset_t *set)
363 struct sigframe *frame;
366 frame = get_sigframe(ka, regs, sizeof(*frame));
367 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
371 * Set up the return code ...
373 * li v0, __NR_sigreturn
376 err |= __put_user(0x24020000 + __NR_sigreturn, frame->sf_code + 0);
377 err |= __put_user(0x0000000c , frame->sf_code + 1);
378 flush_cache_sigtramp((unsigned long) frame->sf_code);
380 err |= setup_sigcontext(regs, &frame->sf_sc);
381 err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
386 * Arguments to signal handler:
389 * a1 = 0 (should be cause)
390 * a2 = pointer to struct sigcontext
392 * $25 and c0_epc point to the signal handler, $29 points to the
395 regs->regs[ 4] = signr;
397 regs->regs[ 6] = (unsigned long) &frame->sf_sc;
398 regs->regs[29] = (unsigned long) frame;
399 regs->regs[31] = (unsigned long) frame->sf_code;
400 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
403 printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
404 current->comm, current->pid,
405 frame, regs->cp0_epc, frame->regs[31]);
410 if (signr == SIGSEGV)
411 ka->sa.sa_handler = SIG_DFL;
412 force_sig(SIGSEGV, current);
416 static void inline setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
417 int signr, sigset_t *set, siginfo_t *info)
419 struct rt_sigframe *frame;
422 frame = get_sigframe(ka, regs, sizeof(*frame));
423 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
427 * Set up the return code ...
429 * li v0, __NR_rt_sigreturn
432 err |= __put_user(0x24020000 + __NR_rt_sigreturn, frame->rs_code + 0);
433 err |= __put_user(0x0000000c , frame->rs_code + 1);
434 flush_cache_sigtramp((unsigned long) frame->rs_code);
436 /* Create siginfo. */
437 err |= copy_siginfo_to_user(&frame->rs_info, info);
439 /* Create the ucontext. */
440 err |= __put_user(0, &frame->rs_uc.uc_flags);
441 err |= __put_user(0, &frame->rs_uc.uc_link);
442 err |= __put_user((void *)current->sas_ss_sp,
443 &frame->rs_uc.uc_stack.ss_sp);
444 err |= __put_user(sas_ss_flags(regs->regs[29]),
445 &frame->rs_uc.uc_stack.ss_flags);
446 err |= __put_user(current->sas_ss_size,
447 &frame->rs_uc.uc_stack.ss_size);
448 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
449 err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
455 * Arguments to signal handler:
458 * a1 = 0 (should be cause)
459 * a2 = pointer to ucontext
461 * $25 and c0_epc point to the signal handler, $29 points to
462 * the struct rt_sigframe.
464 regs->regs[ 4] = signr;
465 regs->regs[ 5] = (unsigned long) &frame->rs_info;
466 regs->regs[ 6] = (unsigned long) &frame->rs_uc;
467 regs->regs[29] = (unsigned long) frame;
468 regs->regs[31] = (unsigned long) frame->rs_code;
469 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
472 printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
473 current->comm, current->pid,
474 frame, regs->cp0_epc, regs->regs[31]);
479 if (signr == SIGSEGV)
480 ka->sa.sa_handler = SIG_DFL;
481 force_sig(SIGSEGV, current);
484 extern void setup_rt_frame_n32(struct k_sigaction * ka,
485 struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info);
487 static inline void handle_signal(unsigned long sig, siginfo_t *info,
488 sigset_t *oldset, struct pt_regs *regs)
490 struct k_sigaction *ka = ¤t->sighand->action[sig-1];
492 switch(regs->regs[0]) {
493 case ERESTART_RESTARTBLOCK:
495 regs->regs[2] = EINTR;
498 if(!(ka->sa.sa_flags & SA_RESTART)) {
499 regs->regs[2] = EINTR;
503 case ERESTARTNOINTR: /* Userland will reload $v0. */
504 regs->regs[7] = regs->regs[26];
508 regs->regs[0] = 0; /* Don't deal with this again. */
510 #ifdef CONFIG_TRAD_SIGNALS
511 if (ka->sa.sa_flags & SA_SIGINFO) {
515 #ifdef CONFIG_MIPS32_N32
516 if ((current->thread.mflags & MF_ABI_MASK) == MF_N32)
517 setup_rt_frame_n32 (ka, regs, sig, oldset, info);
520 setup_rt_frame(ka, regs, sig, oldset, info);
522 #ifdef CONFIG_TRAD_SIGNALS
524 setup_frame(ka, regs, sig, oldset);
527 if (ka->sa.sa_flags & SA_ONESHOT)
528 ka->sa.sa_handler = SIG_DFL;
529 if (!(ka->sa.sa_flags & SA_NODEFER)) {
530 spin_lock_irq(¤t->sighand->siglock);
531 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
532 sigaddset(¤t->blocked,sig);
534 spin_unlock_irq(¤t->sighand->siglock);
538 extern int do_signal32(sigset_t *oldset, struct pt_regs *regs);
539 extern int do_irix_signal(sigset_t *oldset, struct pt_regs *regs);
541 asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs)
546 #ifdef CONFIG_BINFMT_ELF32
547 if ((current->thread.mflags & MF_ABI_MASK) == MF_O32) {
548 return do_signal32(oldset, regs);
553 oldset = ¤t->blocked;
555 signr = get_signal_to_deliver(&info, regs, NULL);
557 handle_signal(signr, &info, oldset, regs);
562 * Who's code doesn't conform to the restartable syscall convention
563 * dies here!!! The li instruction, a single machine instruction,
564 * must directly be followed by the syscall instruction.
567 if (regs->regs[2] == ERESTARTNOHAND ||
568 regs->regs[2] == ERESTARTSYS ||
569 regs->regs[2] == ERESTARTNOINTR) {
570 regs->regs[7] = regs->regs[26];
573 if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
574 regs->regs[2] = __NR_restart_syscall;
575 regs->regs[7] = regs->regs[26];
582 extern int do_irix_signal(sigset_t *oldset, struct pt_regs *regs);
585 * notification of userspace execution resumption
586 * - triggered by current->work.notify_resume
588 asmlinkage void do_notify_resume(struct pt_regs *regs, sigset_t *oldset,
589 __u32 thread_info_flags)
591 /* deal with pending signal delivery */
592 if (thread_info_flags & _TIF_SIGPENDING) {
593 #ifdef CONFIG_BINFMT_ELF32
594 if (likely((current->thread.mflags & MF_ABI_MASK) == MF_O32)) {
595 do_signal32(oldset, regs);
599 #ifdef CONFIG_BINFMT_IRIX
600 if (unlikely(current->personality != PER_LINUX)) {
601 do_irix_signal(oldset, regs);
605 do_signal(oldset, regs);