Linux-2.6.12-rc2
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!
This commit is contained in:
Linus Torvalds
213
arch/um/kernel/signal_kern.c
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213
arch/um/kernel/signal_kern.c
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/*
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* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include "linux/config.h"
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#include "linux/stddef.h"
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#include "linux/sys.h"
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#include "linux/sched.h"
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#include "linux/wait.h"
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#include "linux/kernel.h"
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#include "linux/smp_lock.h"
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#include "linux/module.h"
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#include "linux/slab.h"
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#include "linux/tty.h"
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#include "linux/binfmts.h"
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#include "linux/ptrace.h"
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#include "asm/signal.h"
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#include "asm/uaccess.h"
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#include "asm/unistd.h"
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#include "user_util.h"
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#include "asm/ucontext.h"
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#include "kern_util.h"
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#include "signal_kern.h"
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#include "signal_user.h"
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#include "kern.h"
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#include "frame_kern.h"
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#include "sigcontext.h"
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#include "mode.h"
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EXPORT_SYMBOL(block_signals);
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EXPORT_SYMBOL(unblock_signals);
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#define _S(nr) (1<<((nr)-1))
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#define _BLOCKABLE (~(_S(SIGKILL) | _S(SIGSTOP)))
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/*
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* OK, we're invoking a handler
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*/
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static int handle_signal(struct pt_regs *regs, unsigned long signr,
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struct k_sigaction *ka, siginfo_t *info,
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sigset_t *oldset)
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{
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unsigned long sp;
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int err;
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/* Always make any pending restarted system calls return -EINTR */
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current_thread_info()->restart_block.fn = do_no_restart_syscall;
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/* Did we come from a system call? */
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if(PT_REGS_SYSCALL_NR(regs) >= 0){
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/* If so, check system call restarting.. */
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switch(PT_REGS_SYSCALL_RET(regs)){
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case -ERESTART_RESTARTBLOCK:
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case -ERESTARTNOHAND:
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PT_REGS_SYSCALL_RET(regs) = -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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PT_REGS_SYSCALL_RET(regs) = -EINTR;
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break;
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}
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/* fallthrough */
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case -ERESTARTNOINTR:
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PT_REGS_RESTART_SYSCALL(regs);
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PT_REGS_ORIG_SYSCALL(regs) = PT_REGS_SYSCALL_NR(regs);
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break;
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}
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}
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sp = PT_REGS_SP(regs);
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if((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags(sp) == 0))
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sp = current->sas_ss_sp + current->sas_ss_size;
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#ifdef CONFIG_ARCH_HAS_SC_SIGNALS
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if(!(ka->sa.sa_flags & SA_SIGINFO))
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err = setup_signal_stack_sc(sp, signr, ka, regs, oldset);
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else
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#endif
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err = setup_signal_stack_si(sp, signr, ka, regs, info, oldset);
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if(err){
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spin_lock_irq(¤t->sighand->siglock);
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current->blocked = *oldset;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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force_sigsegv(signr, current);
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}
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else 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,
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&ka->sa.sa_mask);
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sigaddset(¤t->blocked, signr);
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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}
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return err;
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}
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static int kern_do_signal(struct pt_regs *regs, sigset_t *oldset)
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{
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struct k_sigaction ka_copy;
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siginfo_t info;
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int sig, handled_sig = 0;
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while((sig = get_signal_to_deliver(&info, &ka_copy, regs, NULL)) > 0){
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handled_sig = 1;
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/* Whee! Actually deliver the signal. */
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if(!handle_signal(regs, sig, &ka_copy, &info, oldset))
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break;
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}
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/* Did we come from a system call? */
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if(!handled_sig && (PT_REGS_SYSCALL_NR(regs) >= 0)){
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/* Restart the system call - no handlers present */
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if(PT_REGS_SYSCALL_RET(regs) == -ERESTARTNOHAND ||
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PT_REGS_SYSCALL_RET(regs) == -ERESTARTSYS ||
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PT_REGS_SYSCALL_RET(regs) == -ERESTARTNOINTR){
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PT_REGS_ORIG_SYSCALL(regs) = PT_REGS_SYSCALL_NR(regs);
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PT_REGS_RESTART_SYSCALL(regs);
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}
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else if(PT_REGS_SYSCALL_RET(regs) == -ERESTART_RESTARTBLOCK){
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PT_REGS_SYSCALL_RET(regs) = __NR_restart_syscall;
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PT_REGS_RESTART_SYSCALL(regs);
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}
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}
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/* This closes a way to execute a system call on the host. If
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* you set a breakpoint on a system call instruction and singlestep
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* from it, the tracing thread used to PTRACE_SINGLESTEP the process
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* rather than PTRACE_SYSCALL it, allowing the system call to execute
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* on the host. The tracing thread will check this flag and
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* PTRACE_SYSCALL if necessary.
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*/
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if(current->ptrace & PT_DTRACE)
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current->thread.singlestep_syscall =
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is_syscall(PT_REGS_IP(¤t->thread.regs));
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return(handled_sig);
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}
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int do_signal(void)
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{
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return(kern_do_signal(¤t->thread.regs, ¤t->blocked));
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}
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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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long sys_sigsuspend(int history0, int history1, old_sigset_t mask)
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{
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sigset_t saveset;
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mask &= _BLOCKABLE;
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spin_lock_irq(¤t->sighand->siglock);
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saveset = current->blocked;
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siginitset(¤t->blocked, mask);
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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PT_REGS_SYSCALL_RET(¤t->thread.regs) = -EINTR;
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while (1) {
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current->state = TASK_INTERRUPTIBLE;
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schedule();
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if(kern_do_signal(¤t->thread.regs, &saveset))
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return(-EINTR);
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}
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}
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long sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize)
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{
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sigset_t saveset, newset;
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/* XXX: Don't preclude handling different sized sigset_t's. */
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if (sigsetsize != sizeof(sigset_t))
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return -EINVAL;
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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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PT_REGS_SYSCALL_RET(¤t->thread.regs) = -EINTR;
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while (1) {
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current->state = TASK_INTERRUPTIBLE;
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schedule();
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if (kern_do_signal(¤t->thread.regs, &saveset))
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return(-EINTR);
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}
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}
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long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
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{
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return(do_sigaltstack(uss, uoss, PT_REGS_SP(¤t->thread.regs)));
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}
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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