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/cache.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>
26 #include <linux/bitops.h>
27 #include <asm/cacheflush.h>
30 #include <asm/uaccess.h>
31 #include <asm/ucontext.h>
32 #include <asm/cpu-features.h>
35 #include "signal-common.h"
38 * Horribly complicated - with the bloody RM9000 workarounds enabled
39 * the signal trampolines is moving to the end of the structure so we can
40 * increase the alignment without breaking software compatibility.
42 #if ICACHE_REFILLS_WORKAROUND_WAR == 0
45 u32 sf_ass[4]; /* argument save space for o32 */
46 u32 sf_code[2]; /* signal trampoline */
47 struct sigcontext sf_sc;
52 u32 rs_ass[4]; /* argument save space for o32 */
53 u32 rs_code[2]; /* signal trampoline */
54 struct siginfo rs_info;
55 struct ucontext rs_uc;
61 u32 sf_ass[4]; /* argument save space for o32 */
63 struct sigcontext sf_sc; /* hw context */
65 u32 sf_code[8] ____cacheline_aligned; /* signal trampoline */
69 u32 rs_ass[4]; /* argument save space for o32 */
71 struct siginfo rs_info;
72 struct ucontext rs_uc;
73 u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */
81 int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
86 err |= __put_user(regs->cp0_epc, &sc->sc_pc);
88 err |= __put_user(0, &sc->sc_regs[0]);
89 for (i = 1; i < 32; i++)
90 err |= __put_user(regs->regs[i], &sc->sc_regs[i]);
92 #ifdef CONFIG_CPU_HAS_SMARTMIPS
93 err |= __put_user(regs->acx, &sc->sc_acx);
95 err |= __put_user(regs->hi, &sc->sc_mdhi);
96 err |= __put_user(regs->lo, &sc->sc_mdlo);
98 err |= __put_user(mfhi1(), &sc->sc_hi1);
99 err |= __put_user(mflo1(), &sc->sc_lo1);
100 err |= __put_user(mfhi2(), &sc->sc_hi2);
101 err |= __put_user(mflo2(), &sc->sc_lo2);
102 err |= __put_user(mfhi3(), &sc->sc_hi3);
103 err |= __put_user(mflo3(), &sc->sc_lo3);
104 err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
107 err |= __put_user(!!used_math(), &sc->sc_used_math);
111 * Save FPU state to signal context. Signal handler
112 * will "inherit" current FPU state.
116 if (!is_fpu_owner()) {
120 err |= save_fp_context(sc);
127 int fpcsr_pending(unsigned int __user *fpcsr)
130 unsigned int csr, enabled;
132 err = __get_user(csr, fpcsr);
133 enabled = FPU_CSR_UNI_X | ((csr & FPU_CSR_ALL_E) << 5);
135 * If the signal handler set some FPU exceptions, clear it and
140 err |= __put_user(csr, fpcsr);
147 check_and_restore_fp_context(struct sigcontext __user *sc)
151 err = sig = fpcsr_pending(&sc->sc_fpc_csr);
154 err |= restore_fp_context(sc);
158 int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
160 unsigned int used_math;
165 /* Always make any pending restarted system calls return -EINTR */
166 current_thread_info()->restart_block.fn = do_no_restart_syscall;
168 err |= __get_user(regs->cp0_epc, &sc->sc_pc);
170 #ifdef CONFIG_CPU_HAS_SMARTMIPS
171 err |= __get_user(regs->acx, &sc->sc_acx);
173 err |= __get_user(regs->hi, &sc->sc_mdhi);
174 err |= __get_user(regs->lo, &sc->sc_mdlo);
176 err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
177 err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
178 err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
179 err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
180 err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
181 err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
182 err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
185 for (i = 1; i < 32; i++)
186 err |= __get_user(regs->regs[i], &sc->sc_regs[i]);
188 err |= __get_user(used_math, &sc->sc_used_math);
189 conditional_used_math(used_math);
194 /* restore fpu context if we have used it before */
197 err = check_and_restore_fp_context(sc);
199 /* signal handler may have used FPU. Give it up. */
208 void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
213 /* Default to using normal stack */
217 * FPU emulator may have it's own trampoline active just
218 * above the user stack, 16-bytes before the next lowest
219 * 16 byte boundary. Try to avoid trashing it.
223 /* This is the X/Open sanctioned signal stack switching. */
224 if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
225 sp = current->sas_ss_sp + current->sas_ss_size;
227 return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK));
230 int install_sigtramp(unsigned int __user *tramp, unsigned int syscall)
235 * Set up the return code ...
237 * li v0, __NR__foo_sigreturn
241 err = __put_user(0x24020000 + syscall, tramp + 0);
242 err |= __put_user(0x0000000c , tramp + 1);
243 if (ICACHE_REFILLS_WORKAROUND_WAR) {
244 err |= __put_user(0, tramp + 2);
245 err |= __put_user(0, tramp + 3);
246 err |= __put_user(0, tramp + 4);
247 err |= __put_user(0, tramp + 5);
248 err |= __put_user(0, tramp + 6);
249 err |= __put_user(0, tramp + 7);
251 flush_cache_sigtramp((unsigned long) tramp);
257 * Atomically swap in the new signal mask, and wait for a signal.
260 #ifdef CONFIG_TRAD_SIGNALS
261 asmlinkage int sys_sigsuspend(nabi_no_regargs struct pt_regs regs)
264 sigset_t __user *uset;
266 uset = (sigset_t __user *) regs.regs[4];
267 if (copy_from_user(&newset, uset, sizeof(sigset_t)))
269 sigdelsetmask(&newset, ~_BLOCKABLE);
271 spin_lock_irq(¤t->sighand->siglock);
272 current->saved_sigmask = current->blocked;
273 current->blocked = newset;
275 spin_unlock_irq(¤t->sighand->siglock);
277 current->state = TASK_INTERRUPTIBLE;
279 set_thread_flag(TIF_RESTORE_SIGMASK);
280 return -ERESTARTNOHAND;
284 asmlinkage int sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
287 sigset_t __user *unewset;
290 /* XXX Don't preclude handling different sized sigset_t's. */
291 sigsetsize = regs.regs[5];
292 if (sigsetsize != sizeof(sigset_t))
295 unewset = (sigset_t __user *) regs.regs[4];
296 if (copy_from_user(&newset, unewset, sizeof(newset)))
298 sigdelsetmask(&newset, ~_BLOCKABLE);
300 spin_lock_irq(¤t->sighand->siglock);
301 current->saved_sigmask = current->blocked;
302 current->blocked = newset;
304 spin_unlock_irq(¤t->sighand->siglock);
306 current->state = TASK_INTERRUPTIBLE;
308 set_thread_flag(TIF_RESTORE_SIGMASK);
309 return -ERESTARTNOHAND;
312 #ifdef CONFIG_TRAD_SIGNALS
313 asmlinkage int sys_sigaction(int sig, const struct sigaction __user *act,
314 struct sigaction __user *oact)
316 struct k_sigaction new_ka, old_ka;
323 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
325 err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler);
326 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
327 err |= __get_user(mask, &act->sa_mask.sig[0]);
331 siginitset(&new_ka.sa.sa_mask, mask);
334 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
337 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
339 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
340 err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
341 err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
342 err |= __put_user(0, &oact->sa_mask.sig[1]);
343 err |= __put_user(0, &oact->sa_mask.sig[2]);
344 err |= __put_user(0, &oact->sa_mask.sig[3]);
353 asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs)
355 const stack_t __user *uss = (const stack_t __user *) regs.regs[4];
356 stack_t __user *uoss = (stack_t __user *) regs.regs[5];
357 unsigned long usp = regs.regs[29];
359 return do_sigaltstack(uss, uoss, usp);
362 #ifdef CONFIG_TRAD_SIGNALS
363 asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs)
365 struct sigframe __user *frame;
369 frame = (struct sigframe __user *) regs.regs[29];
370 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
372 if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked)))
375 sigdelsetmask(&blocked, ~_BLOCKABLE);
376 spin_lock_irq(¤t->sighand->siglock);
377 current->blocked = blocked;
379 spin_unlock_irq(¤t->sighand->siglock);
381 sig = restore_sigcontext(®s, &frame->sf_sc);
385 force_sig(sig, current);
388 * Don't let your children do this ...
390 __asm__ __volatile__(
398 force_sig(SIGSEGV, current);
400 #endif /* CONFIG_TRAD_SIGNALS */
402 asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
404 struct rt_sigframe __user *frame;
409 frame = (struct rt_sigframe __user *) regs.regs[29];
410 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
412 if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
415 sigdelsetmask(&set, ~_BLOCKABLE);
416 spin_lock_irq(¤t->sighand->siglock);
417 current->blocked = set;
419 spin_unlock_irq(¤t->sighand->siglock);
421 sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext);
425 force_sig(sig, current);
427 if (__copy_from_user(&st, &frame->rs_uc.uc_stack, sizeof(st)))
429 /* It is more difficult to avoid calling this function than to
430 call it and ignore errors. */
431 do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]);
434 * Don't let your children do this ...
436 __asm__ __volatile__(
444 force_sig(SIGSEGV, current);
447 #ifdef CONFIG_TRAD_SIGNALS
448 static int setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
449 int signr, sigset_t *set)
451 struct sigframe __user *frame;
454 frame = get_sigframe(ka, regs, sizeof(*frame));
455 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
458 err |= install_sigtramp(frame->sf_code, __NR_sigreturn);
460 err |= setup_sigcontext(regs, &frame->sf_sc);
461 err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
466 * Arguments to signal handler:
469 * a1 = 0 (should be cause)
470 * a2 = pointer to struct sigcontext
472 * $25 and c0_epc point to the signal handler, $29 points to the
475 regs->regs[ 4] = signr;
477 regs->regs[ 6] = (unsigned long) &frame->sf_sc;
478 regs->regs[29] = (unsigned long) frame;
479 regs->regs[31] = (unsigned long) frame->sf_code;
480 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
482 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
483 current->comm, current->pid,
484 frame, regs->cp0_epc, regs->regs[31]);
488 force_sigsegv(signr, current);
493 static int setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
494 int signr, sigset_t *set, siginfo_t *info)
496 struct rt_sigframe __user *frame;
499 frame = get_sigframe(ka, regs, sizeof(*frame));
500 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
503 err |= install_sigtramp(frame->rs_code, __NR_rt_sigreturn);
505 /* Create siginfo. */
506 err |= copy_siginfo_to_user(&frame->rs_info, info);
508 /* Create the ucontext. */
509 err |= __put_user(0, &frame->rs_uc.uc_flags);
510 err |= __put_user(NULL, &frame->rs_uc.uc_link);
511 err |= __put_user((void __user *)current->sas_ss_sp,
512 &frame->rs_uc.uc_stack.ss_sp);
513 err |= __put_user(sas_ss_flags(regs->regs[29]),
514 &frame->rs_uc.uc_stack.ss_flags);
515 err |= __put_user(current->sas_ss_size,
516 &frame->rs_uc.uc_stack.ss_size);
517 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
518 err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
524 * Arguments to signal handler:
527 * a1 = 0 (should be cause)
528 * a2 = pointer to ucontext
530 * $25 and c0_epc point to the signal handler, $29 points to
531 * the struct rt_sigframe.
533 regs->regs[ 4] = signr;
534 regs->regs[ 5] = (unsigned long) &frame->rs_info;
535 regs->regs[ 6] = (unsigned long) &frame->rs_uc;
536 regs->regs[29] = (unsigned long) frame;
537 regs->regs[31] = (unsigned long) frame->rs_code;
538 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
540 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
541 current->comm, current->pid,
542 frame, regs->cp0_epc, regs->regs[31]);
547 force_sigsegv(signr, current);
551 struct mips_abi mips_abi = {
552 #ifdef CONFIG_TRAD_SIGNALS
553 .setup_frame = setup_frame,
555 .setup_rt_frame = setup_rt_frame,
556 .restart = __NR_restart_syscall
559 static int handle_signal(unsigned long sig, siginfo_t *info,
560 struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs)
564 switch(regs->regs[0]) {
565 case ERESTART_RESTARTBLOCK:
567 regs->regs[2] = EINTR;
570 if (!(ka->sa.sa_flags & SA_RESTART)) {
571 regs->regs[2] = EINTR;
575 case ERESTARTNOINTR: /* Userland will reload $v0. */
576 regs->regs[7] = regs->regs[26];
580 regs->regs[0] = 0; /* Don't deal with this again. */
582 if (sig_uses_siginfo(ka))
583 ret = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info);
585 ret = current->thread.abi->setup_frame(ka, regs, sig, oldset);
587 spin_lock_irq(¤t->sighand->siglock);
588 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
589 if (!(ka->sa.sa_flags & SA_NODEFER))
590 sigaddset(¤t->blocked,sig);
592 spin_unlock_irq(¤t->sighand->siglock);
597 static void do_signal(struct pt_regs *regs)
599 struct k_sigaction ka;
605 * We want the common case to go fast, which is why we may in certain
606 * cases get here from kernel mode. Just return without doing anything
609 if (!user_mode(regs))
612 if (test_thread_flag(TIF_RESTORE_SIGMASK))
613 oldset = ¤t->saved_sigmask;
615 oldset = ¤t->blocked;
617 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
619 /* Whee! Actually deliver the signal. */
620 if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
622 * A signal was successfully delivered; the saved
623 * sigmask will have been stored in the signal frame,
624 * and will be restored by sigreturn, so we can simply
625 * clear the TIF_RESTORE_SIGMASK flag.
627 if (test_thread_flag(TIF_RESTORE_SIGMASK))
628 clear_thread_flag(TIF_RESTORE_SIGMASK);
635 * Who's code doesn't conform to the restartable syscall convention
636 * dies here!!! The li instruction, a single machine instruction,
637 * must directly be followed by the syscall instruction.
640 if (regs->regs[2] == ERESTARTNOHAND ||
641 regs->regs[2] == ERESTARTSYS ||
642 regs->regs[2] == ERESTARTNOINTR) {
643 regs->regs[7] = regs->regs[26];
646 if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
647 regs->regs[2] = current->thread.abi->restart;
648 regs->regs[7] = regs->regs[26];
651 regs->regs[0] = 0; /* Don't deal with this again. */
655 * If there's no signal to deliver, we just put the saved sigmask
658 if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
659 clear_thread_flag(TIF_RESTORE_SIGMASK);
660 sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL);
665 * notification of userspace execution resumption
666 * - triggered by the TIF_WORK_MASK flags
668 asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused,
669 __u32 thread_info_flags)
671 /* deal with pending signal delivery */
672 if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))