mirror of
https://github.com/torvalds/linux.git
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1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
518 lines
13 KiB
C
518 lines
13 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 1994 - 2000 Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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*/
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#include <linux/config.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/personality.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/kernel.h>
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#include <linux/signal.h>
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#include <linux/errno.h>
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#include <linux/wait.h>
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#include <linux/ptrace.h>
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#include <linux/unistd.h>
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#include <linux/compiler.h>
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#include <asm/asm.h>
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#include <linux/bitops.h>
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#include <asm/cacheflush.h>
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#include <asm/fpu.h>
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#include <asm/sim.h>
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#include <asm/uaccess.h>
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#include <asm/ucontext.h>
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#include <asm/cpu-features.h>
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#include "signal-common.h"
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#define DEBUG_SIG 0
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#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
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static int do_signal(sigset_t *oldset, struct pt_regs *regs);
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/*
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* Atomically swap in the new signal mask, and wait for a signal.
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*/
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#ifdef CONFIG_TRAD_SIGNALS
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save_static_function(sys_sigsuspend);
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__attribute_used__ noinline static int
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_sys_sigsuspend(nabi_no_regargs struct pt_regs regs)
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{
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sigset_t *uset, saveset, newset;
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uset = (sigset_t *) regs.regs[4];
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if (copy_from_user(&newset, uset, sizeof(sigset_t)))
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return -EFAULT;
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sigdelsetmask(&newset, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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saveset = current->blocked;
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current->blocked = newset;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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regs.regs[2] = EINTR;
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regs.regs[7] = 1;
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while (1) {
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current->state = TASK_INTERRUPTIBLE;
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schedule();
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if (do_signal(&saveset, ®s))
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return -EINTR;
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}
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}
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#endif
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save_static_function(sys_rt_sigsuspend);
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__attribute_used__ noinline static int
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_sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
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{
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sigset_t *unewset, saveset, newset;
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size_t sigsetsize;
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/* XXX Don't preclude handling different sized sigset_t's. */
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sigsetsize = regs.regs[5];
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if (sigsetsize != sizeof(sigset_t))
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return -EINVAL;
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unewset = (sigset_t *) regs.regs[4];
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if (copy_from_user(&newset, unewset, sizeof(newset)))
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return -EFAULT;
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sigdelsetmask(&newset, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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saveset = current->blocked;
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current->blocked = newset;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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regs.regs[2] = EINTR;
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regs.regs[7] = 1;
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while (1) {
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current->state = TASK_INTERRUPTIBLE;
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schedule();
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if (do_signal(&saveset, ®s))
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return -EINTR;
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}
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}
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#ifdef CONFIG_TRAD_SIGNALS
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asmlinkage int sys_sigaction(int sig, const struct sigaction *act,
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struct sigaction *oact)
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{
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struct k_sigaction new_ka, old_ka;
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int ret;
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int err = 0;
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if (act) {
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old_sigset_t mask;
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if (!access_ok(VERIFY_READ, act, sizeof(*act)))
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return -EFAULT;
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err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler);
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err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
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err |= __get_user(mask, &act->sa_mask.sig[0]);
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if (err)
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return -EFAULT;
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siginitset(&new_ka.sa.sa_mask, mask);
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}
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ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
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if (!ret && oact) {
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if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
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return -EFAULT;
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err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
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err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
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err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
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err |= __put_user(0, &oact->sa_mask.sig[1]);
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err |= __put_user(0, &oact->sa_mask.sig[2]);
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err |= __put_user(0, &oact->sa_mask.sig[3]);
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if (err)
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return -EFAULT;
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}
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return ret;
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}
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#endif
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asmlinkage int sys_sigaltstack(nabi_no_regargs struct pt_regs regs)
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{
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const stack_t *uss = (const stack_t *) regs.regs[4];
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stack_t *uoss = (stack_t *) regs.regs[5];
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unsigned long usp = regs.regs[29];
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return do_sigaltstack(uss, uoss, usp);
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}
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#if PLAT_TRAMPOLINE_STUFF_LINE
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#define __tramp __attribute__((aligned(PLAT_TRAMPOLINE_STUFF_LINE)))
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#else
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#define __tramp
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#endif
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#ifdef CONFIG_TRAD_SIGNALS
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struct sigframe {
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u32 sf_ass[4]; /* argument save space for o32 */
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u32 sf_code[2] __tramp; /* signal trampoline */
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struct sigcontext sf_sc __tramp;
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sigset_t sf_mask;
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};
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#endif
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struct rt_sigframe {
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u32 rs_ass[4]; /* argument save space for o32 */
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u32 rs_code[2] __tramp; /* signal trampoline */
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struct siginfo rs_info __tramp;
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struct ucontext rs_uc;
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};
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#ifdef CONFIG_TRAD_SIGNALS
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save_static_function(sys_sigreturn);
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__attribute_used__ noinline static void
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_sys_sigreturn(nabi_no_regargs struct pt_regs regs)
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{
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struct sigframe *frame;
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sigset_t blocked;
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frame = (struct sigframe *) regs.regs[29];
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if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
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goto badframe;
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if (__copy_from_user(&blocked, &frame->sf_mask, sizeof(blocked)))
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goto badframe;
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sigdelsetmask(&blocked, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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current->blocked = blocked;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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if (restore_sigcontext(®s, &frame->sf_sc))
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goto badframe;
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/*
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* Don't let your children do this ...
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*/
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if (current_thread_info()->flags & TIF_SYSCALL_TRACE)
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do_syscall_trace(®s, 1);
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__asm__ __volatile__(
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"move\t$29, %0\n\t"
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"j\tsyscall_exit"
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:/* no outputs */
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:"r" (®s));
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/* Unreached */
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badframe:
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force_sig(SIGSEGV, current);
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}
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#endif
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save_static_function(sys_rt_sigreturn);
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__attribute_used__ noinline static void
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_sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
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{
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struct rt_sigframe *frame;
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sigset_t set;
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stack_t st;
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frame = (struct rt_sigframe *) regs.regs[29];
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if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
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goto badframe;
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if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
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goto badframe;
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sigdelsetmask(&set, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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current->blocked = set;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext))
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goto badframe;
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if (__copy_from_user(&st, &frame->rs_uc.uc_stack, sizeof(st)))
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goto badframe;
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/* It is more difficult to avoid calling this function than to
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call it and ignore errors. */
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do_sigaltstack(&st, NULL, regs.regs[29]);
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/*
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* Don't let your children do this ...
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*/
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__asm__ __volatile__(
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"move\t$29, %0\n\t"
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"j\tsyscall_exit"
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:/* no outputs */
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:"r" (®s));
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/* Unreached */
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badframe:
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force_sig(SIGSEGV, current);
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}
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#ifdef CONFIG_TRAD_SIGNALS
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static void inline setup_frame(struct k_sigaction * ka, struct pt_regs *regs,
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int signr, sigset_t *set)
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{
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struct sigframe *frame;
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int err = 0;
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frame = get_sigframe(ka, regs, sizeof(*frame));
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if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
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goto give_sigsegv;
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/*
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* Set up the return code ...
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*
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* li v0, __NR_sigreturn
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* syscall
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*/
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if (PLAT_TRAMPOLINE_STUFF_LINE)
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__clear_user(frame->sf_code, PLAT_TRAMPOLINE_STUFF_LINE);
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err |= __put_user(0x24020000 + __NR_sigreturn, frame->sf_code + 0);
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err |= __put_user(0x0000000c , frame->sf_code + 1);
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flush_cache_sigtramp((unsigned long) frame->sf_code);
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err |= setup_sigcontext(regs, &frame->sf_sc);
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err |= __copy_to_user(&frame->sf_mask, set, sizeof(*set));
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if (err)
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goto give_sigsegv;
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/*
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* Arguments to signal handler:
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*
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* a0 = signal number
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* a1 = 0 (should be cause)
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* a2 = pointer to struct sigcontext
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*
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* $25 and c0_epc point to the signal handler, $29 points to the
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* struct sigframe.
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*/
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regs->regs[ 4] = signr;
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regs->regs[ 5] = 0;
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regs->regs[ 6] = (unsigned long) &frame->sf_sc;
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regs->regs[29] = (unsigned long) frame;
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regs->regs[31] = (unsigned long) frame->sf_code;
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regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
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#if DEBUG_SIG
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printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
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current->comm, current->pid,
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frame, regs->cp0_epc, frame->regs[31]);
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#endif
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return;
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give_sigsegv:
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force_sigsegv(signr, current);
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}
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#endif
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static void inline setup_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
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int signr, sigset_t *set, siginfo_t *info)
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{
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struct rt_sigframe *frame;
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int err = 0;
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frame = get_sigframe(ka, regs, sizeof(*frame));
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if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
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goto give_sigsegv;
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/*
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* Set up the return code ...
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*
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* li v0, __NR_rt_sigreturn
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* syscall
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*/
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if (PLAT_TRAMPOLINE_STUFF_LINE)
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__clear_user(frame->rs_code, PLAT_TRAMPOLINE_STUFF_LINE);
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err |= __put_user(0x24020000 + __NR_rt_sigreturn, frame->rs_code + 0);
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err |= __put_user(0x0000000c , frame->rs_code + 1);
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flush_cache_sigtramp((unsigned long) frame->rs_code);
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/* Create siginfo. */
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err |= copy_siginfo_to_user(&frame->rs_info, info);
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/* Create the ucontext. */
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err |= __put_user(0, &frame->rs_uc.uc_flags);
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err |= __put_user(0, &frame->rs_uc.uc_link);
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err |= __put_user((void *)current->sas_ss_sp,
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&frame->rs_uc.uc_stack.ss_sp);
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err |= __put_user(sas_ss_flags(regs->regs[29]),
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&frame->rs_uc.uc_stack.ss_flags);
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err |= __put_user(current->sas_ss_size,
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&frame->rs_uc.uc_stack.ss_size);
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err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
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err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
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if (err)
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goto give_sigsegv;
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/*
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* Arguments to signal handler:
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*
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* a0 = signal number
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* a1 = 0 (should be cause)
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* a2 = pointer to ucontext
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*
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* $25 and c0_epc point to the signal handler, $29 points to
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* the struct rt_sigframe.
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*/
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regs->regs[ 4] = signr;
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regs->regs[ 5] = (unsigned long) &frame->rs_info;
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regs->regs[ 6] = (unsigned long) &frame->rs_uc;
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regs->regs[29] = (unsigned long) frame;
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regs->regs[31] = (unsigned long) frame->rs_code;
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regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
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#if DEBUG_SIG
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printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n",
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current->comm, current->pid,
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frame, regs->cp0_epc, regs->regs[31]);
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#endif
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return;
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give_sigsegv:
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force_sigsegv(signr, current);
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}
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extern void setup_rt_frame_n32(struct k_sigaction * ka,
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struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info);
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static inline void handle_signal(unsigned long sig, siginfo_t *info,
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struct k_sigaction *ka, sigset_t *oldset, struct pt_regs *regs)
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{
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switch(regs->regs[0]) {
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case ERESTART_RESTARTBLOCK:
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case ERESTARTNOHAND:
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regs->regs[2] = EINTR;
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break;
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case ERESTARTSYS:
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if(!(ka->sa.sa_flags & SA_RESTART)) {
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regs->regs[2] = EINTR;
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break;
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}
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/* fallthrough */
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case ERESTARTNOINTR: /* Userland will reload $v0. */
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regs->regs[7] = regs->regs[26];
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regs->cp0_epc -= 8;
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}
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regs->regs[0] = 0; /* Don't deal with this again. */
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#ifdef CONFIG_TRAD_SIGNALS
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if (ka->sa.sa_flags & SA_SIGINFO) {
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#else
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if (1) {
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#endif
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#ifdef CONFIG_MIPS32_N32
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if ((current->thread.mflags & MF_ABI_MASK) == MF_N32)
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setup_rt_frame_n32 (ka, regs, sig, oldset, info);
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else
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#endif
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setup_rt_frame(ka, regs, sig, oldset, info);
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}
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#ifdef CONFIG_TRAD_SIGNALS
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else
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setup_frame(ka, regs, sig, oldset);
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#endif
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if (!(ka->sa.sa_flags & SA_NODEFER)) {
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spin_lock_irq(¤t->sighand->siglock);
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sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
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sigaddset(¤t->blocked,sig);
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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}
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}
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extern int do_signal32(sigset_t *oldset, struct pt_regs *regs);
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extern int do_irix_signal(sigset_t *oldset, struct pt_regs *regs);
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static int do_signal(sigset_t *oldset, struct pt_regs *regs)
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{
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struct k_sigaction ka;
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siginfo_t info;
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int signr;
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#ifdef CONFIG_BINFMT_ELF32
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if ((current->thread.mflags & MF_ABI_MASK) == MF_O32) {
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return do_signal32(oldset, regs);
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}
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#endif
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/*
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* We want the common case to go fast, which is why we may in certain
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* cases get here from kernel mode. Just return without doing anything
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* if so.
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*/
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if (!user_mode(regs))
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return 1;
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if (try_to_freeze(0))
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goto no_signal;
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if (!oldset)
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oldset = ¤t->blocked;
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signr = get_signal_to_deliver(&info, &ka, regs, NULL);
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if (signr > 0) {
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handle_signal(signr, &info, &ka, oldset, regs);
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return 1;
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}
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no_signal:
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/*
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* Who's code doesn't conform to the restartable syscall convention
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* dies here!!! The li instruction, a single machine instruction,
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* must directly be followed by the syscall instruction.
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*/
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if (regs->regs[0]) {
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if (regs->regs[2] == ERESTARTNOHAND ||
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regs->regs[2] == ERESTARTSYS ||
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regs->regs[2] == ERESTARTNOINTR) {
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regs->regs[7] = regs->regs[26];
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regs->cp0_epc -= 8;
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}
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if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
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|
regs->regs[2] = __NR_restart_syscall;
|
|
regs->regs[7] = regs->regs[26];
|
|
regs->cp0_epc -= 4;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* notification of userspace execution resumption
|
|
* - triggered by current->work.notify_resume
|
|
*/
|
|
asmlinkage void do_notify_resume(struct pt_regs *regs, sigset_t *oldset,
|
|
__u32 thread_info_flags)
|
|
{
|
|
/* deal with pending signal delivery */
|
|
if (thread_info_flags & _TIF_SIGPENDING) {
|
|
#ifdef CONFIG_BINFMT_ELF32
|
|
if (likely((current->thread.mflags & MF_ABI_MASK) == MF_O32)) {
|
|
do_signal32(oldset, regs);
|
|
return;
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_BINFMT_IRIX
|
|
if (unlikely(current->personality != PER_LINUX)) {
|
|
do_irix_signal(oldset, regs);
|
|
return;
|
|
}
|
|
#endif
|
|
do_signal(oldset, regs);
|
|
}
|
|
}
|