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![Greg Ungerer](/assets/img/avatar_default.png)
Make restart blocks working, required for proper syscall restarting. Derived from same changes for m68k arch by Andreas Schwab <schwab@suse.de> Signed-off-by: Greg Ungerer <gerg@uclinux.org>
789 lines
20 KiB
C
789 lines
20 KiB
C
/*
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* linux/arch/m68knommu/kernel/signal.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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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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/*
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* Linux/m68k support by Hamish Macdonald
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*
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* 68060 fixes by Jesper Skov
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*
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* 1997-12-01 Modified for POSIX.1b signals by Andreas Schwab
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*
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* mathemu support by Roman Zippel
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* (Note: fpstate in the signal context is completely ignored for the emulator
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* and the internal floating point format is put on stack)
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*/
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/*
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* ++roman (07/09/96): implemented signal stacks (specially for tosemu on
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* Atari :-) Current limitation: Only one sigstack can be active at one time.
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* If a second signal with SA_ONSTACK set arrives while working on a sigstack,
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* SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested
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* signal handlers!
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*/
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/kernel.h>
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#include <linux/signal.h>
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#include <linux/syscalls.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/stddef.h>
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#include <linux/highuid.h>
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#include <linux/tty.h>
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#include <linux/personality.h>
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#include <linux/binfmts.h>
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#include <asm/setup.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/traps.h>
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#include <asm/ucontext.h>
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#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
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void ret_from_user_signal(void);
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void ret_from_user_rt_signal(void);
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asmlinkage 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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asmlinkage int do_sigsuspend(struct pt_regs *regs)
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{
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old_sigset_t mask = regs->d3;
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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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regs->d0 = -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 (do_signal(&saveset, regs))
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return -EINTR;
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}
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}
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asmlinkage int
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do_rt_sigsuspend(struct pt_regs *regs)
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{
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sigset_t *unewset = (sigset_t *)regs->d1;
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size_t sigsetsize = (size_t)regs->d2;
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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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regs->d0 = -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 (do_signal(&saveset, regs))
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return -EINTR;
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}
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}
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asmlinkage int
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sys_sigaction(int sig, const struct old_sigaction *act,
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struct old_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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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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__get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
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__get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
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return -EFAULT;
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__get_user(new_ka.sa.sa_flags, &act->sa_flags);
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__get_user(mask, &act->sa_mask);
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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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__put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
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__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
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return -EFAULT;
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__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
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__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
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}
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return ret;
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}
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asmlinkage int
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sys_sigaltstack(const stack_t *uss, stack_t *uoss)
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{
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return do_sigaltstack(uss, uoss, rdusp());
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}
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/*
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* Do a signal return; undo the signal stack.
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*
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* Keep the return code on the stack quadword aligned!
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* That makes the cache flush below easier.
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*/
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struct sigframe
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{
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char *pretcode;
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int sig;
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int code;
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struct sigcontext *psc;
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char retcode[8];
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unsigned long extramask[_NSIG_WORDS-1];
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struct sigcontext sc;
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};
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struct rt_sigframe
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{
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char *pretcode;
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int sig;
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struct siginfo *pinfo;
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void *puc;
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char retcode[8];
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struct siginfo info;
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struct ucontext uc;
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};
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#ifdef CONFIG_FPU
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static unsigned char fpu_version = 0; /* version number of fpu, set by setup_frame */
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static inline int restore_fpu_state(struct sigcontext *sc)
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{
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int err = 1;
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if (FPU_IS_EMU) {
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/* restore registers */
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memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12);
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memcpy(current->thread.fp, sc->sc_fpregs, 24);
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return 0;
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}
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if (sc->sc_fpstate[0]) {
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/* Verify the frame format. */
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if (sc->sc_fpstate[0] != fpu_version)
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goto out;
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__asm__ volatile (".chip 68k/68881\n\t"
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"fmovemx %0,%/fp0-%/fp1\n\t"
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"fmoveml %1,%/fpcr/%/fpsr/%/fpiar\n\t"
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".chip 68k"
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: /* no outputs */
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: "m" (*sc->sc_fpregs), "m" (*sc->sc_fpcntl));
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}
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__asm__ volatile (".chip 68k/68881\n\t"
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"frestore %0\n\t"
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".chip 68k" : : "m" (*sc->sc_fpstate));
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err = 0;
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out:
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return err;
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}
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#define FPCONTEXT_SIZE 216
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#define uc_fpstate uc_filler[0]
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#define uc_formatvec uc_filler[FPCONTEXT_SIZE/4]
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#define uc_extra uc_filler[FPCONTEXT_SIZE/4+1]
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static inline int rt_restore_fpu_state(struct ucontext *uc)
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{
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unsigned char fpstate[FPCONTEXT_SIZE];
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int context_size = 0;
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fpregset_t fpregs;
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int err = 1;
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if (FPU_IS_EMU) {
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/* restore fpu control register */
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if (__copy_from_user(current->thread.fpcntl,
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&uc->uc_mcontext.fpregs.f_pcr, 12))
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goto out;
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/* restore all other fpu register */
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if (__copy_from_user(current->thread.fp,
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uc->uc_mcontext.fpregs.f_fpregs, 96))
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goto out;
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return 0;
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}
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if (__get_user(*(long *)fpstate, (long *)&uc->uc_fpstate))
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goto out;
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if (fpstate[0]) {
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context_size = fpstate[1];
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/* Verify the frame format. */
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if (fpstate[0] != fpu_version)
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goto out;
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if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs,
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sizeof(fpregs)))
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goto out;
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__asm__ volatile (".chip 68k/68881\n\t"
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"fmovemx %0,%/fp0-%/fp7\n\t"
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"fmoveml %1,%/fpcr/%/fpsr/%/fpiar\n\t"
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".chip 68k"
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: /* no outputs */
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: "m" (*fpregs.f_fpregs),
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"m" (fpregs.f_pcr));
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}
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if (context_size &&
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__copy_from_user(fpstate + 4, (long *)&uc->uc_fpstate + 1,
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context_size))
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goto out;
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__asm__ volatile (".chip 68k/68881\n\t"
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"frestore %0\n\t"
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".chip 68k" : : "m" (*fpstate));
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err = 0;
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out:
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return err;
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}
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#endif
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static inline int
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restore_sigcontext(struct pt_regs *regs, struct sigcontext *usc, void *fp,
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int *pd0)
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{
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int formatvec;
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struct sigcontext context;
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int err = 0;
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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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/* get previous context */
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if (copy_from_user(&context, usc, sizeof(context)))
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goto badframe;
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/* restore passed registers */
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regs->d1 = context.sc_d1;
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regs->a0 = context.sc_a0;
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regs->a1 = context.sc_a1;
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((struct switch_stack *)regs - 1)->a5 = context.sc_a5;
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regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff);
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regs->pc = context.sc_pc;
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regs->orig_d0 = -1; /* disable syscall checks */
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wrusp(context.sc_usp);
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formatvec = context.sc_formatvec;
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regs->format = formatvec >> 12;
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regs->vector = formatvec & 0xfff;
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#ifdef CONFIG_FPU
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err = restore_fpu_state(&context);
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#endif
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*pd0 = context.sc_d0;
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return err;
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badframe:
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return 1;
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}
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static inline int
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rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
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struct ucontext *uc, int *pd0)
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{
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int temp;
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greg_t *gregs = uc->uc_mcontext.gregs;
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unsigned long usp;
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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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err = __get_user(temp, &uc->uc_mcontext.version);
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if (temp != MCONTEXT_VERSION)
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goto badframe;
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/* restore passed registers */
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err |= __get_user(regs->d0, &gregs[0]);
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err |= __get_user(regs->d1, &gregs[1]);
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err |= __get_user(regs->d2, &gregs[2]);
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err |= __get_user(regs->d3, &gregs[3]);
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err |= __get_user(regs->d4, &gregs[4]);
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err |= __get_user(regs->d5, &gregs[5]);
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err |= __get_user(sw->d6, &gregs[6]);
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err |= __get_user(sw->d7, &gregs[7]);
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err |= __get_user(regs->a0, &gregs[8]);
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err |= __get_user(regs->a1, &gregs[9]);
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err |= __get_user(regs->a2, &gregs[10]);
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err |= __get_user(sw->a3, &gregs[11]);
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err |= __get_user(sw->a4, &gregs[12]);
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err |= __get_user(sw->a5, &gregs[13]);
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err |= __get_user(sw->a6, &gregs[14]);
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err |= __get_user(usp, &gregs[15]);
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wrusp(usp);
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err |= __get_user(regs->pc, &gregs[16]);
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err |= __get_user(temp, &gregs[17]);
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regs->sr = (regs->sr & 0xff00) | (temp & 0xff);
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regs->orig_d0 = -1; /* disable syscall checks */
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regs->format = temp >> 12;
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regs->vector = temp & 0xfff;
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if (do_sigaltstack(&uc->uc_stack, NULL, usp) == -EFAULT)
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goto badframe;
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*pd0 = regs->d0;
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return err;
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badframe:
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return 1;
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}
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asmlinkage int do_sigreturn(unsigned long __unused)
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{
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struct switch_stack *sw = (struct switch_stack *) &__unused;
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struct pt_regs *regs = (struct pt_regs *) (sw + 1);
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unsigned long usp = rdusp();
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struct sigframe *frame = (struct sigframe *)(usp - 4);
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sigset_t set;
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int d0;
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if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
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goto badframe;
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if (__get_user(set.sig[0], &frame->sc.sc_mask) ||
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(_NSIG_WORDS > 1 &&
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__copy_from_user(&set.sig[1], &frame->extramask,
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sizeof(frame->extramask))))
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goto badframe;
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|
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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(regs, &frame->sc, frame + 1, &d0))
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goto badframe;
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return d0;
|
|
|
|
badframe:
|
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force_sig(SIGSEGV, current);
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return 0;
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}
|
|
|
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asmlinkage int do_rt_sigreturn(unsigned long __unused)
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{
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struct switch_stack *sw = (struct switch_stack *) &__unused;
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struct pt_regs *regs = (struct pt_regs *) (sw + 1);
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unsigned long usp = rdusp();
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struct rt_sigframe *frame = (struct rt_sigframe *)(usp - 4);
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sigset_t set;
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int d0;
|
|
|
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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->uc.uc_sigmask, sizeof(set)))
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|
goto badframe;
|
|
|
|
sigdelsetmask(&set, ~_BLOCKABLE);
|
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spin_lock_irq(¤t->sighand->siglock);
|
|
current->blocked = set;
|
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recalc_sigpending();
|
|
spin_unlock_irq(¤t->sighand->siglock);
|
|
|
|
if (rt_restore_ucontext(regs, sw, &frame->uc, &d0))
|
|
goto badframe;
|
|
return d0;
|
|
|
|
badframe:
|
|
force_sig(SIGSEGV, current);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_FPU
|
|
/*
|
|
* Set up a signal frame.
|
|
*/
|
|
|
|
static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
|
|
{
|
|
if (FPU_IS_EMU) {
|
|
/* save registers */
|
|
memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12);
|
|
memcpy(sc->sc_fpregs, current->thread.fp, 24);
|
|
return;
|
|
}
|
|
|
|
__asm__ volatile (".chip 68k/68881\n\t"
|
|
"fsave %0\n\t"
|
|
".chip 68k"
|
|
: : "m" (*sc->sc_fpstate) : "memory");
|
|
|
|
if (sc->sc_fpstate[0]) {
|
|
fpu_version = sc->sc_fpstate[0];
|
|
__asm__ volatile (".chip 68k/68881\n\t"
|
|
"fmovemx %/fp0-%/fp1,%0\n\t"
|
|
"fmoveml %/fpcr/%/fpsr/%/fpiar,%1\n\t"
|
|
".chip 68k"
|
|
: /* no outputs */
|
|
: "m" (*sc->sc_fpregs),
|
|
"m" (*sc->sc_fpcntl)
|
|
: "memory");
|
|
}
|
|
}
|
|
|
|
static inline int rt_save_fpu_state(struct ucontext *uc, struct pt_regs *regs)
|
|
{
|
|
unsigned char fpstate[FPCONTEXT_SIZE];
|
|
int context_size = 0;
|
|
int err = 0;
|
|
|
|
if (FPU_IS_EMU) {
|
|
/* save fpu control register */
|
|
err |= copy_to_user(&uc->uc_mcontext.fpregs.f_pcr,
|
|
current->thread.fpcntl, 12);
|
|
/* save all other fpu register */
|
|
err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs,
|
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current->thread.fp, 96);
|
|
return err;
|
|
}
|
|
|
|
__asm__ volatile (".chip 68k/68881\n\t"
|
|
"fsave %0\n\t"
|
|
".chip 68k"
|
|
: : "m" (*fpstate) : "memory");
|
|
|
|
err |= __put_user(*(long *)fpstate, (long *)&uc->uc_fpstate);
|
|
if (fpstate[0]) {
|
|
fpregset_t fpregs;
|
|
context_size = fpstate[1];
|
|
fpu_version = fpstate[0];
|
|
__asm__ volatile (".chip 68k/68881\n\t"
|
|
"fmovemx %/fp0-%/fp7,%0\n\t"
|
|
"fmoveml %/fpcr/%/fpsr/%/fpiar,%1\n\t"
|
|
".chip 68k"
|
|
: /* no outputs */
|
|
: "m" (*fpregs.f_fpregs),
|
|
"m" (fpregs.f_pcr)
|
|
: "memory");
|
|
err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs,
|
|
sizeof(fpregs));
|
|
}
|
|
if (context_size)
|
|
err |= copy_to_user((long *)&uc->uc_fpstate + 1, fpstate + 4,
|
|
context_size);
|
|
return err;
|
|
}
|
|
|
|
#endif
|
|
|
|
static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
|
|
unsigned long mask)
|
|
{
|
|
sc->sc_mask = mask;
|
|
sc->sc_usp = rdusp();
|
|
sc->sc_d0 = regs->d0;
|
|
sc->sc_d1 = regs->d1;
|
|
sc->sc_a0 = regs->a0;
|
|
sc->sc_a1 = regs->a1;
|
|
sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5;
|
|
sc->sc_sr = regs->sr;
|
|
sc->sc_pc = regs->pc;
|
|
sc->sc_formatvec = regs->format << 12 | regs->vector;
|
|
#ifdef CONFIG_FPU
|
|
save_fpu_state(sc, regs);
|
|
#endif
|
|
}
|
|
|
|
static inline int rt_setup_ucontext(struct ucontext *uc, struct pt_regs *regs)
|
|
{
|
|
struct switch_stack *sw = (struct switch_stack *)regs - 1;
|
|
greg_t *gregs = uc->uc_mcontext.gregs;
|
|
int err = 0;
|
|
|
|
err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version);
|
|
err |= __put_user(regs->d0, &gregs[0]);
|
|
err |= __put_user(regs->d1, &gregs[1]);
|
|
err |= __put_user(regs->d2, &gregs[2]);
|
|
err |= __put_user(regs->d3, &gregs[3]);
|
|
err |= __put_user(regs->d4, &gregs[4]);
|
|
err |= __put_user(regs->d5, &gregs[5]);
|
|
err |= __put_user(sw->d6, &gregs[6]);
|
|
err |= __put_user(sw->d7, &gregs[7]);
|
|
err |= __put_user(regs->a0, &gregs[8]);
|
|
err |= __put_user(regs->a1, &gregs[9]);
|
|
err |= __put_user(regs->a2, &gregs[10]);
|
|
err |= __put_user(sw->a3, &gregs[11]);
|
|
err |= __put_user(sw->a4, &gregs[12]);
|
|
err |= __put_user(sw->a5, &gregs[13]);
|
|
err |= __put_user(sw->a6, &gregs[14]);
|
|
err |= __put_user(rdusp(), &gregs[15]);
|
|
err |= __put_user(regs->pc, &gregs[16]);
|
|
err |= __put_user(regs->sr, &gregs[17]);
|
|
#ifdef CONFIG_FPU
|
|
err |= rt_save_fpu_state(uc, regs);
|
|
#endif
|
|
return err;
|
|
}
|
|
|
|
static inline void *
|
|
get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
|
|
{
|
|
unsigned long usp;
|
|
|
|
/* Default to using normal stack. */
|
|
usp = rdusp();
|
|
|
|
/* This is the X/Open sanctioned signal stack switching. */
|
|
if (ka->sa.sa_flags & SA_ONSTACK) {
|
|
if (!sas_ss_flags(usp))
|
|
usp = current->sas_ss_sp + current->sas_ss_size;
|
|
}
|
|
return (void *)((usp - frame_size) & -8UL);
|
|
}
|
|
|
|
static void setup_frame (int sig, struct k_sigaction *ka,
|
|
sigset_t *set, struct pt_regs *regs)
|
|
{
|
|
struct sigframe *frame;
|
|
struct sigcontext context;
|
|
int err = 0;
|
|
|
|
frame = get_sigframe(ka, regs, sizeof(*frame));
|
|
|
|
err |= __put_user((current_thread_info()->exec_domain
|
|
&& current_thread_info()->exec_domain->signal_invmap
|
|
&& sig < 32
|
|
? current_thread_info()->exec_domain->signal_invmap[sig]
|
|
: sig),
|
|
&frame->sig);
|
|
|
|
err |= __put_user(regs->vector, &frame->code);
|
|
err |= __put_user(&frame->sc, &frame->psc);
|
|
|
|
if (_NSIG_WORDS > 1)
|
|
err |= copy_to_user(frame->extramask, &set->sig[1],
|
|
sizeof(frame->extramask));
|
|
|
|
setup_sigcontext(&context, regs, set->sig[0]);
|
|
err |= copy_to_user (&frame->sc, &context, sizeof(context));
|
|
|
|
/* Set up to return from userspace. */
|
|
err |= __put_user((void *) ret_from_user_signal, &frame->pretcode);
|
|
|
|
if (err)
|
|
goto give_sigsegv;
|
|
|
|
/* Set up registers for signal handler */
|
|
wrusp ((unsigned long) frame);
|
|
regs->pc = (unsigned long) ka->sa.sa_handler;
|
|
((struct switch_stack *)regs - 1)->a5 = current->mm->start_data;
|
|
regs->format = 0x4; /*set format byte to make stack appear modulo 4
|
|
which it will be when doing the rte */
|
|
|
|
adjust_stack:
|
|
/* Prepare to skip over the extra stuff in the exception frame. */
|
|
if (regs->stkadj) {
|
|
struct pt_regs *tregs =
|
|
(struct pt_regs *)((ulong)regs + regs->stkadj);
|
|
#if defined(DEBUG)
|
|
printk(KERN_DEBUG "Performing stackadjust=%04x\n", regs->stkadj);
|
|
#endif
|
|
/* This must be copied with decreasing addresses to
|
|
handle overlaps. */
|
|
tregs->vector = 0;
|
|
tregs->format = 0;
|
|
tregs->pc = regs->pc;
|
|
tregs->sr = regs->sr;
|
|
}
|
|
return;
|
|
|
|
give_sigsegv:
|
|
force_sigsegv(sig, current);
|
|
goto adjust_stack;
|
|
}
|
|
|
|
static void setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info,
|
|
sigset_t *set, struct pt_regs *regs)
|
|
{
|
|
struct rt_sigframe *frame;
|
|
int err = 0;
|
|
|
|
frame = get_sigframe(ka, regs, sizeof(*frame));
|
|
|
|
err |= __put_user((current_thread_info()->exec_domain
|
|
&& current_thread_info()->exec_domain->signal_invmap
|
|
&& sig < 32
|
|
? current_thread_info()->exec_domain->signal_invmap[sig]
|
|
: sig),
|
|
&frame->sig);
|
|
err |= __put_user(&frame->info, &frame->pinfo);
|
|
err |= __put_user(&frame->uc, &frame->puc);
|
|
err |= copy_siginfo_to_user(&frame->info, info);
|
|
|
|
/* Create the ucontext. */
|
|
err |= __put_user(0, &frame->uc.uc_flags);
|
|
err |= __put_user(0, &frame->uc.uc_link);
|
|
err |= __put_user((void *)current->sas_ss_sp,
|
|
&frame->uc.uc_stack.ss_sp);
|
|
err |= __put_user(sas_ss_flags(rdusp()),
|
|
&frame->uc.uc_stack.ss_flags);
|
|
err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
|
|
err |= rt_setup_ucontext(&frame->uc, regs);
|
|
err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set));
|
|
|
|
/* Set up to return from userspace. */
|
|
err |= __put_user((void *) ret_from_user_rt_signal, &frame->pretcode);
|
|
|
|
if (err)
|
|
goto give_sigsegv;
|
|
|
|
/* Set up registers for signal handler */
|
|
wrusp ((unsigned long) frame);
|
|
regs->pc = (unsigned long) ka->sa.sa_handler;
|
|
((struct switch_stack *)regs - 1)->a5 = current->mm->start_data;
|
|
regs->format = 0x4; /*set format byte to make stack appear modulo 4
|
|
which it will be when doing the rte */
|
|
|
|
adjust_stack:
|
|
/* Prepare to skip over the extra stuff in the exception frame. */
|
|
if (regs->stkadj) {
|
|
struct pt_regs *tregs =
|
|
(struct pt_regs *)((ulong)regs + regs->stkadj);
|
|
#if defined(DEBUG)
|
|
printk(KERN_DEBUG "Performing stackadjust=%04x\n", regs->stkadj);
|
|
#endif
|
|
/* This must be copied with decreasing addresses to
|
|
handle overlaps. */
|
|
tregs->vector = 0;
|
|
tregs->format = 0;
|
|
tregs->pc = regs->pc;
|
|
tregs->sr = regs->sr;
|
|
}
|
|
return;
|
|
|
|
give_sigsegv:
|
|
force_sigsegv(sig, current);
|
|
goto adjust_stack;
|
|
}
|
|
|
|
static inline void
|
|
handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
|
|
{
|
|
switch (regs->d0) {
|
|
case -ERESTARTNOHAND:
|
|
if (!has_handler)
|
|
goto do_restart;
|
|
regs->d0 = -EINTR;
|
|
break;
|
|
|
|
case -ERESTART_RESTARTBLOCK:
|
|
if (!has_handler) {
|
|
regs->d0 = __NR_restart_syscall;
|
|
regs->pc -= 2;
|
|
break;
|
|
}
|
|
regs->d0 = -EINTR;
|
|
break;
|
|
|
|
case -ERESTARTSYS:
|
|
if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
|
|
regs->d0 = -EINTR;
|
|
break;
|
|
}
|
|
/* fallthrough */
|
|
case -ERESTARTNOINTR:
|
|
do_restart:
|
|
regs->d0 = regs->orig_d0;
|
|
regs->pc -= 2;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* OK, we're invoking a handler
|
|
*/
|
|
static void
|
|
handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
|
|
sigset_t *oldset, struct pt_regs *regs)
|
|
{
|
|
/* are we from a system call? */
|
|
if (regs->orig_d0 >= 0)
|
|
/* If so, check system call restarting.. */
|
|
handle_restart(regs, ka, 1);
|
|
|
|
/* set up the stack frame */
|
|
if (ka->sa.sa_flags & SA_SIGINFO)
|
|
setup_rt_frame(sig, ka, info, oldset, regs);
|
|
else
|
|
setup_frame(sig, ka, oldset, regs);
|
|
|
|
if (ka->sa.sa_flags & SA_ONESHOT)
|
|
ka->sa.sa_handler = SIG_DFL;
|
|
|
|
spin_lock_irq(¤t->sighand->siglock);
|
|
sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
|
|
if (!(ka->sa.sa_flags & SA_NODEFER))
|
|
sigaddset(¤t->blocked,sig);
|
|
recalc_sigpending();
|
|
spin_unlock_irq(¤t->sighand->siglock);
|
|
}
|
|
|
|
/*
|
|
* Note that 'init' is a special process: it doesn't get signals it doesn't
|
|
* want to handle. Thus you cannot kill init even with a SIGKILL even by
|
|
* mistake.
|
|
*/
|
|
asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs)
|
|
{
|
|
struct k_sigaction ka;
|
|
siginfo_t info;
|
|
int signr;
|
|
|
|
/*
|
|
* We want the common case to go fast, which
|
|
* is why we may in certain cases get here from
|
|
* kernel mode. Just return without doing anything
|
|
* if so.
|
|
*/
|
|
if (!user_mode(regs))
|
|
return 1;
|
|
|
|
if (!oldset)
|
|
oldset = ¤t->blocked;
|
|
|
|
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
|
|
if (signr > 0) {
|
|
/* Whee! Actually deliver the signal. */
|
|
handle_signal(signr, &ka, &info, oldset, regs);
|
|
return 1;
|
|
}
|
|
|
|
/* Did we come from a system call? */
|
|
if (regs->orig_d0 >= 0) {
|
|
/* Restart the system call - no handlers present */
|
|
handle_restart(regs, NULL, 0);
|
|
}
|
|
return 0;
|
|
}
|