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>
23 #include <linux/compiler.h>
26 #include <linux/bitops.h>
27 #include <asm/cacheflush.h>
30 #include <asm/uaccess.h>
31 #include <asm/ucontext.h>
35 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
37 extern asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs);
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 __attribute_used__ noinline static int
46 _sys_sigsuspend(nabi_no_regargs struct pt_regs regs)
48 sigset_t *uset, saveset, newset;
50 uset = (sigset_t *) regs.regs[4];
51 if (copy_from_user(&newset, uset, sizeof(sigset_t)))
53 sigdelsetmask(&newset, ~_BLOCKABLE);
55 spin_lock_irq(¤t->sighand->siglock);
56 saveset = current->blocked;
57 current->blocked = newset;
59 spin_unlock_irq(¤t->sighand->siglock);
64 current->state = TASK_INTERRUPTIBLE;
66 if (do_signal(&saveset, ®s))
72 save_static_function(sys_rt_sigsuspend);
73 __attribute_used__ noinline static int
74 _sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
76 sigset_t *unewset, saveset, newset;
79 /* XXX Don't preclude handling different sized sigset_t's. */
80 sigsetsize = regs.regs[5];
81 if (sigsetsize != sizeof(sigset_t))
84 unewset = (sigset_t *) regs.regs[4];
85 if (copy_from_user(&newset, unewset, sizeof(newset)))
87 sigdelsetmask(&newset, ~_BLOCKABLE);
89 spin_lock_irq(¤t->sighand->siglock);
90 saveset = current->blocked;
91 current->blocked = newset;
93 spin_unlock_irq(¤t->sighand->siglock);
98 current->state = TASK_INTERRUPTIBLE;
100 if (do_signal(&saveset, ®s))
105 #ifdef CONFIG_TRAD_SIGNALS
106 asmlinkage int sys_sigaction(int sig, const struct sigaction *act,
107 struct sigaction *oact)
109 struct k_sigaction new_ka, old_ka;
116 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
118 err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler);
119 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
120 err |= __get_user(mask, &act->sa_mask.sig[0]);
124 siginitset(&new_ka.sa.sa_mask, mask);
127 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
130 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
132 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
133 err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
134 err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
135 err |= __put_user(0, &oact->sa_mask.sig[1]);
136 err |= __put_user(0, &oact->sa_mask.sig[2]);
137 err |= __put_user(0, &oact->sa_mask.sig[3]);
146 asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs)
148 const stack_t *uss = (const stack_t *) regs.regs[4];
149 stack_t *uoss = (stack_t *) regs.regs[5];
150 unsigned long usp = regs.regs[29];
152 return do_sigaltstack(uss, uoss, usp);
155 asmlinkage int restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
159 /* Always make any pending restarted system calls return -EINTR */
160 current_thread_info()->restart_block.fn = do_no_restart_syscall;
162 err |= __get_user(regs->cp0_epc, &sc->sc_pc);
163 err |= __get_user(regs->hi, &sc->sc_mdhi);
164 err |= __get_user(regs->lo, &sc->sc_mdlo);
166 #define restore_gp_reg(i) do { \
167 err |= __get_user(regs->regs[i], &sc->sc_regs[i]); \
169 restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3);
170 restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6);
171 restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9);
172 restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12);
173 restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15);
174 restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18);
175 restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21);
176 restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24);
177 restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27);
178 restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30);
180 #undef restore_gp_reg
182 err |= __get_user(current->used_math, &sc->sc_used_math);
186 if (current->used_math) {
187 /* restore fpu context if we have used it before */
189 err |= restore_fp_context(sc);
191 /* signal handler may have used FPU. Give it up. */
200 #if PLAT_TRAMPOLINE_STUFF_LINE
201 #define __tramp __attribute__((aligned(PLAT_TRAMPOLINE_STUFF_LINE)))
206 #ifdef CONFIG_TRAD_SIGNALS
208 u32 sf_ass[4]; /* argument save space for o32 */
209 u32 sf_code[2] __tramp; /* signal trampoline */
210 struct sigcontext sf_sc __tramp;
216 u32 rs_ass[4]; /* argument save space for o32 */
217 u32 rs_code[2] __tramp; /* signal trampoline */
218 struct siginfo rs_info __tramp;
219 struct ucontext rs_uc;
222 #ifdef CONFIG_TRAD_SIGNALS
223 asmlinkage void sys_sigreturn(struct pt_regs regs)
225 struct sigframe *frame;
228 frame = (struct sigframe *) regs.regs[29];
229 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
231 if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked)))
234 sigdelsetmask(&blocked, ~_BLOCKABLE);
235 spin_lock_irq(¤t->sighand->siglock);
236 current->blocked = blocked;
238 spin_unlock_irq(¤t->sighand->siglock);
240 if (restore_sigcontext(®s, &frame->sf_sc))
244 * Don't let your children do this ...
246 if (current_thread_info()->flags & TIF_SYSCALL_TRACE)
247 do_syscall_trace(®s, 1);
248 __asm__ __volatile__(
256 force_sig(SIGSEGV, current);
260 asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
262 struct rt_sigframe *frame;
266 frame = (struct rt_sigframe *) regs.regs[29];
267 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
269 if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
272 sigdelsetmask(&set, ~_BLOCKABLE);
273 spin_lock_irq(¤t->sighand->siglock);
274 current->blocked = set;
276 spin_unlock_irq(¤t->sighand->siglock);
278 if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext))
281 if (__copy_from_user(&st, &frame->rs_uc.uc_stack, sizeof(st)))
283 /* It is more difficult to avoid calling this function than to
284 call it and ignore errors. */
285 do_sigaltstack(&st, NULL, regs.regs[29]);
288 * Don't let your children do this ...
290 __asm__ __volatile__(
298 force_sig(SIGSEGV, current);
301 inline int setup_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
305 err |= __put_user(regs->cp0_epc, &sc->sc_pc);
306 err |= __put_user(regs->cp0_status, &sc->sc_status);
308 #define save_gp_reg(i) do { \
309 err |= __put_user(regs->regs[i], &sc->sc_regs[i]); \
311 __put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2);
312 save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6);
313 save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10);
314 save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14);
315 save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18);
316 save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22);
317 save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26);
318 save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30);
322 err |= __put_user(regs->hi, &sc->sc_mdhi);
323 err |= __put_user(regs->lo, &sc->sc_mdlo);
324 err |= __put_user(regs->cp0_cause, &sc->sc_cause);
325 err |= __put_user(regs->cp0_badvaddr, &sc->sc_badvaddr);
327 err |= __put_user(current->used_math, &sc->sc_used_math);
329 if (!current->used_math)
333 * Save FPU state to signal context. Signal handler will "inherit"
338 if (!is_fpu_owner()) {
342 err |= save_fp_context(sc);
351 * Determine which stack to use..
353 static inline void *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
356 unsigned long sp, almask;
358 /* Default to using normal stack */
362 * FPU emulator may have it's own trampoline active just
363 * above the user stack, 16-bytes before the next lowest
364 * 16 byte boundary. Try to avoid trashing it.
368 /* This is the X/Open sanctioned signal stack switching. */
369 if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
370 sp = current->sas_ss_sp + current->sas_ss_size;
372 if (PLAT_TRAMPOLINE_STUFF_LINE)
373 almask = ~(PLAT_TRAMPOLINE_STUFF_LINE - 1);
377 return (void *)((sp - frame_size) & ~(PLAT_TRAMPOLINE_STUFF_LINE - 1));
380 #ifdef CONFIG_TRAD_SIGNALS
381 static void inline setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
382 int signr, sigset_t *set)
384 struct sigframe *frame;
387 frame = get_sigframe(ka, regs, sizeof(*frame));
388 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
392 * Set up the return code ...
394 * li v0, __NR_sigreturn
397 if (PLAT_TRAMPOLINE_STUFF_LINE)
398 __builtin_memset(frame->sf_code, '0',
399 PLAT_TRAMPOLINE_STUFF_LINE);
400 err |= __put_user(0x24020000 + __NR_sigreturn, frame->sf_code + 0);
401 err |= __put_user(0x0000000c , frame->sf_code + 1);
402 flush_cache_sigtramp((unsigned long) frame->sf_code);
404 err |= setup_sigcontext(regs, &frame->sf_sc);
405 err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
410 * Arguments to signal handler:
413 * a1 = 0 (should be cause)
414 * a2 = pointer to struct sigcontext
416 * $25 and c0_epc point to the signal handler, $29 points to the
419 regs->regs[ 4] = signr;
421 regs->regs[ 6] = (unsigned long) &frame->sf_sc;
422 regs->regs[29] = (unsigned long) frame;
423 regs->regs[31] = (unsigned long) frame->sf_code;
424 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
427 printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
428 current->comm, current->pid,
429 frame, regs->cp0_epc, frame->regs[31]);
434 force_sigsegv(signr, current);
438 static void inline setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
439 int signr, sigset_t *set, siginfo_t *info)
441 struct rt_sigframe *frame;
444 frame = get_sigframe(ka, regs, sizeof(*frame));
445 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
449 * Set up the return code ...
451 * li v0, __NR_rt_sigreturn
454 if (PLAT_TRAMPOLINE_STUFF_LINE)
455 __builtin_memset(frame->rs_code, '0',
456 PLAT_TRAMPOLINE_STUFF_LINE);
457 err |= __put_user(0x24020000 + __NR_rt_sigreturn, frame->rs_code + 0);
458 err |= __put_user(0x0000000c , frame->rs_code + 1);
459 flush_cache_sigtramp((unsigned long) frame->rs_code);
461 /* Create siginfo. */
462 err |= copy_siginfo_to_user(&frame->rs_info, info);
464 /* Create the ucontext. */
465 err |= __put_user(0, &frame->rs_uc.uc_flags);
466 err |= __put_user(0, &frame->rs_uc.uc_link);
467 err |= __put_user((void *)current->sas_ss_sp,
468 &frame->rs_uc.uc_stack.ss_sp);
469 err |= __put_user(sas_ss_flags(regs->regs[29]),
470 &frame->rs_uc.uc_stack.ss_flags);
471 err |= __put_user(current->sas_ss_size,
472 &frame->rs_uc.uc_stack.ss_size);
473 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
474 err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
480 * Arguments to signal handler:
483 * a1 = 0 (should be cause)
484 * a2 = pointer to ucontext
486 * $25 and c0_epc point to the signal handler, $29 points to
487 * the struct rt_sigframe.
489 regs->regs[ 4] = signr;
490 regs->regs[ 5] = (unsigned long) &frame->rs_info;
491 regs->regs[ 6] = (unsigned long) &frame->rs_uc;
492 regs->regs[29] = (unsigned long) frame;
493 regs->regs[31] = (unsigned long) frame->rs_code;
494 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
497 printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
498 current->comm, current->pid,
499 frame, regs->cp0_epc, regs->regs[31]);
504 force_sigsegv(signr, current);
507 extern void setup_rt_frame_n32(struct k_sigaction * ka,
508 struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info);
510 static inline void handle_signal(unsigned long sig, siginfo_t *info,
511 struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs)
513 switch(regs->regs[0]) {
514 case ERESTART_RESTARTBLOCK:
516 regs->regs[2] = EINTR;
519 if(!(ka->sa.sa_flags & SA_RESTART)) {
520 regs->regs[2] = EINTR;
524 case ERESTARTNOINTR: /* Userland will reload $v0. */
525 regs->regs[7] = regs->regs[26];
529 regs->regs[0] = 0; /* Don't deal with this again. */
531 #ifdef CONFIG_TRAD_SIGNALS
532 if (ka->sa.sa_flags & SA_SIGINFO) {
536 #ifdef CONFIG_MIPS32_N32
537 if ((current->thread.mflags & MF_ABI_MASK) == MF_N32)
538 setup_rt_frame_n32 (ka, regs, sig, oldset, info);
541 setup_rt_frame(ka, regs, sig, oldset, info);
543 #ifdef CONFIG_TRAD_SIGNALS
545 setup_frame(ka, regs, sig, oldset);
548 if (!(ka->sa.sa_flags & SA_NODEFER)) {
549 spin_lock_irq(¤t->sighand->siglock);
550 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
551 sigaddset(¤t->blocked,sig);
553 spin_unlock_irq(¤t->sighand->siglock);
557 extern int do_signal32(sigset_t *oldset, struct pt_regs *regs);
558 extern int do_irix_signal(sigset_t *oldset, struct pt_regs *regs);
560 asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs)
562 struct k_sigaction ka;
566 #ifdef CONFIG_BINFMT_ELF32
567 if ((current->thread.mflags & MF_ABI_MASK) == MF_O32) {
568 return do_signal32(oldset, regs);
573 * We want the common case to go fast, which is why we may in certain
574 * cases get here from kernel mode. Just return without doing anything
577 if (!user_mode(regs))
580 if (current->flags & PF_FREEZE) {
586 oldset = ¤t->blocked;
588 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
590 handle_signal(signr, &info, &ka, oldset, regs);
596 * Who's code doesn't conform to the restartable syscall convention
597 * dies here!!! The li instruction, a single machine instruction,
598 * must directly be followed by the syscall instruction.
601 if (regs->regs[2] == ERESTARTNOHAND ||
602 regs->regs[2] == ERESTARTSYS ||
603 regs->regs[2] == ERESTARTNOINTR) {
604 regs->regs[7] = regs->regs[26];
607 if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
608 regs->regs[2] = __NR_restart_syscall;
609 regs->regs[7] = regs->regs[26];
616 extern int do_irix_signal(sigset_t *oldset, struct pt_regs *regs);
619 * notification of userspace execution resumption
620 * - triggered by current->work.notify_resume
622 asmlinkage void do_notify_resume(struct pt_regs *regs, sigset_t *oldset,
623 __u32 thread_info_flags)
625 /* deal with pending signal delivery */
626 if (thread_info_flags & _TIF_SIGPENDING) {
627 #ifdef CONFIG_BINFMT_ELF32
628 if (likely((current->thread.mflags & MF_ABI_MASK) == MF_O32)) {
629 do_signal32(oldset, regs);
633 #ifdef CONFIG_BINFMT_IRIX
634 if (unlikely(current->personality != PER_LINUX)) {
635 do_irix_signal(oldset, regs);
639 do_signal(oldset, regs);