![Al Viro](/assets/img/avatar_default.png)
Does block_sigmask() + tracehook_signal_handler(); called when sigframe has been successfully built. All architectures converted to it; block_sigmask() itself is gone now (merged into this one). I'm still not too happy with the signature, but that's a separate story (IMO we need a structure that would contain signal number + siginfo + k_sigaction, so that get_signal_to_deliver() would fill one, signal_delivered(), handle_signal() and probably setup...frame() - take one). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
656 lines
16 KiB
C
656 lines
16 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/cache.h>
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#include <linux/irqflags.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/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 <linux/syscalls.h>
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#include <linux/uaccess.h>
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#include <linux/tracehook.h>
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#include <asm/abi.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/ucontext.h>
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#include <asm/cpu-features.h>
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#include <asm/war.h>
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#include <asm/vdso.h>
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#include <asm/dsp.h>
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#include "signal-common.h"
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static int (*save_fp_context)(struct sigcontext __user *sc);
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static int (*restore_fp_context)(struct sigcontext __user *sc);
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extern asmlinkage int _save_fp_context(struct sigcontext __user *sc);
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extern asmlinkage int _restore_fp_context(struct sigcontext __user *sc);
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extern asmlinkage int fpu_emulator_save_context(struct sigcontext __user *sc);
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extern asmlinkage int fpu_emulator_restore_context(struct sigcontext __user *sc);
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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_pad[2]; /* Was: signal trampoline */
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struct sigcontext sf_sc;
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sigset_t sf_mask;
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};
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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_pad[2]; /* Was: signal trampoline */
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struct siginfo rs_info;
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struct ucontext rs_uc;
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};
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/*
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* Helper routines
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*/
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static int protected_save_fp_context(struct sigcontext __user *sc)
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{
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int err;
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while (1) {
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lock_fpu_owner();
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own_fpu_inatomic(1);
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err = save_fp_context(sc); /* this might fail */
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unlock_fpu_owner();
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if (likely(!err))
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break;
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/* touch the sigcontext and try again */
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err = __put_user(0, &sc->sc_fpregs[0]) |
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__put_user(0, &sc->sc_fpregs[31]) |
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__put_user(0, &sc->sc_fpc_csr);
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if (err)
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break; /* really bad sigcontext */
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}
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return err;
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}
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static int protected_restore_fp_context(struct sigcontext __user *sc)
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{
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int err, tmp __maybe_unused;
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while (1) {
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lock_fpu_owner();
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own_fpu_inatomic(0);
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err = restore_fp_context(sc); /* this might fail */
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unlock_fpu_owner();
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if (likely(!err))
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break;
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/* touch the sigcontext and try again */
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err = __get_user(tmp, &sc->sc_fpregs[0]) |
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__get_user(tmp, &sc->sc_fpregs[31]) |
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__get_user(tmp, &sc->sc_fpc_csr);
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if (err)
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break; /* really bad sigcontext */
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}
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return err;
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}
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int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
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{
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int err = 0;
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int i;
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unsigned int used_math;
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err |= __put_user(regs->cp0_epc, &sc->sc_pc);
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err |= __put_user(0, &sc->sc_regs[0]);
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for (i = 1; i < 32; i++)
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err |= __put_user(regs->regs[i], &sc->sc_regs[i]);
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#ifdef CONFIG_CPU_HAS_SMARTMIPS
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err |= __put_user(regs->acx, &sc->sc_acx);
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#endif
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err |= __put_user(regs->hi, &sc->sc_mdhi);
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err |= __put_user(regs->lo, &sc->sc_mdlo);
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if (cpu_has_dsp) {
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err |= __put_user(mfhi1(), &sc->sc_hi1);
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err |= __put_user(mflo1(), &sc->sc_lo1);
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err |= __put_user(mfhi2(), &sc->sc_hi2);
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err |= __put_user(mflo2(), &sc->sc_lo2);
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err |= __put_user(mfhi3(), &sc->sc_hi3);
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err |= __put_user(mflo3(), &sc->sc_lo3);
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err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
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}
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used_math = !!used_math();
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err |= __put_user(used_math, &sc->sc_used_math);
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if (used_math) {
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/*
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* Save FPU state to signal context. Signal handler
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* will "inherit" current FPU state.
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*/
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err |= protected_save_fp_context(sc);
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}
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return err;
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}
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int fpcsr_pending(unsigned int __user *fpcsr)
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{
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int err, sig = 0;
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unsigned int csr, enabled;
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err = __get_user(csr, fpcsr);
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enabled = FPU_CSR_UNI_X | ((csr & FPU_CSR_ALL_E) << 5);
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/*
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* If the signal handler set some FPU exceptions, clear it and
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* send SIGFPE.
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*/
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if (csr & enabled) {
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csr &= ~enabled;
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err |= __put_user(csr, fpcsr);
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sig = SIGFPE;
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}
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return err ?: sig;
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}
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static int
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check_and_restore_fp_context(struct sigcontext __user *sc)
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{
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int err, sig;
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err = sig = fpcsr_pending(&sc->sc_fpc_csr);
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if (err > 0)
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err = 0;
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err |= protected_restore_fp_context(sc);
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return err ?: sig;
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}
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int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
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{
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unsigned int used_math;
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unsigned long treg;
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int err = 0;
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int i;
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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(regs->cp0_epc, &sc->sc_pc);
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#ifdef CONFIG_CPU_HAS_SMARTMIPS
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err |= __get_user(regs->acx, &sc->sc_acx);
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#endif
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err |= __get_user(regs->hi, &sc->sc_mdhi);
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err |= __get_user(regs->lo, &sc->sc_mdlo);
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if (cpu_has_dsp) {
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err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
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err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
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err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
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err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
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err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
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err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
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err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
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}
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for (i = 1; i < 32; i++)
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err |= __get_user(regs->regs[i], &sc->sc_regs[i]);
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err |= __get_user(used_math, &sc->sc_used_math);
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conditional_used_math(used_math);
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if (used_math) {
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/* restore fpu context if we have used it before */
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if (!err)
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err = check_and_restore_fp_context(sc);
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} else {
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/* signal handler may have used FPU. Give it up. */
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lose_fpu(0);
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}
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return err;
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}
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void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
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size_t frame_size)
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{
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unsigned long sp;
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/* Default to using normal stack */
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sp = regs->regs[29];
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/*
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* FPU emulator may have it's own trampoline active just
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* above the user stack, 16-bytes before the next lowest
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* 16 byte boundary. Try to avoid trashing it.
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*/
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sp -= 32;
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/* This is the X/Open sanctioned signal stack switching. */
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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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return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK));
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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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#ifdef CONFIG_TRAD_SIGNALS
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asmlinkage int sys_sigsuspend(nabi_no_regargs struct pt_regs regs)
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{
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sigset_t newset;
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sigset_t __user *uset;
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uset = (sigset_t __user *) 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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return sigsuspend(&newset);
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}
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#endif
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asmlinkage int sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
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{
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sigset_t newset;
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sigset_t __user *unewset;
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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 __user *) 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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return sigsuspend(&newset);
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}
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#ifdef CONFIG_TRAD_SIGNALS
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SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act,
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struct sigaction __user *, 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 __user *uss = (const stack_t __user *) regs.regs[4];
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stack_t __user *uoss = (stack_t __user *) 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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#ifdef CONFIG_TRAD_SIGNALS
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asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs)
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{
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struct sigframe __user *frame;
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sigset_t blocked;
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int sig;
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frame = (struct sigframe __user *) 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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set_current_blocked(&blocked);
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sig = restore_sigcontext(®s, &frame->sf_sc);
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if (sig < 0)
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goto badframe;
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else if (sig)
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force_sig(sig, current);
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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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#endif /* CONFIG_TRAD_SIGNALS */
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asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
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{
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struct rt_sigframe __user *frame;
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sigset_t set;
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int sig;
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frame = (struct rt_sigframe __user *) 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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set_current_blocked(&set);
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sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext);
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if (sig < 0)
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goto badframe;
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else if (sig)
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force_sig(sig, current);
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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(&frame->rs_uc.uc_stack, 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 int setup_frame(void *sig_return, struct k_sigaction *ka,
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struct pt_regs *regs, int signr, sigset_t *set)
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{
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struct sigframe __user *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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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) sig_return;
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regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
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DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
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current->comm, current->pid,
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frame, regs->cp0_epc, regs->regs[31]);
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return 0;
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give_sigsegv:
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force_sigsegv(signr, current);
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return -EFAULT;
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}
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#endif
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static int setup_rt_frame(void *sig_return, struct k_sigaction *ka,
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struct pt_regs *regs, int signr, sigset_t *set,
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siginfo_t *info)
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{
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struct rt_sigframe __user *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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/* 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(NULL, &frame->rs_uc.uc_link);
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err |= __put_user((void __user *)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
|
|
*
|
|
* $25 and c0_epc point to the signal handler, $29 points to
|
|
* the struct rt_sigframe.
|
|
*/
|
|
regs->regs[ 4] = signr;
|
|
regs->regs[ 5] = (unsigned long) &frame->rs_info;
|
|
regs->regs[ 6] = (unsigned long) &frame->rs_uc;
|
|
regs->regs[29] = (unsigned long) frame;
|
|
regs->regs[31] = (unsigned long) sig_return;
|
|
regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
|
|
|
|
DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
|
|
current->comm, current->pid,
|
|
frame, regs->cp0_epc, regs->regs[31]);
|
|
|
|
return 0;
|
|
|
|
give_sigsegv:
|
|
force_sigsegv(signr, current);
|
|
return -EFAULT;
|
|
}
|
|
|
|
struct mips_abi mips_abi = {
|
|
#ifdef CONFIG_TRAD_SIGNALS
|
|
.setup_frame = setup_frame,
|
|
.signal_return_offset = offsetof(struct mips_vdso, signal_trampoline),
|
|
#endif
|
|
.setup_rt_frame = setup_rt_frame,
|
|
.rt_signal_return_offset =
|
|
offsetof(struct mips_vdso, rt_signal_trampoline),
|
|
.restart = __NR_restart_syscall
|
|
};
|
|
|
|
static void handle_signal(unsigned long sig, siginfo_t *info,
|
|
struct k_sigaction *ka, struct pt_regs *regs)
|
|
{
|
|
sigset_t *oldset = sigmask_to_save();
|
|
int ret;
|
|
struct mips_abi *abi = current->thread.abi;
|
|
void *vdso = current->mm->context.vdso;
|
|
|
|
if (regs->regs[0]) {
|
|
switch(regs->regs[2]) {
|
|
case ERESTART_RESTARTBLOCK:
|
|
case ERESTARTNOHAND:
|
|
regs->regs[2] = EINTR;
|
|
break;
|
|
case ERESTARTSYS:
|
|
if (!(ka->sa.sa_flags & SA_RESTART)) {
|
|
regs->regs[2] = EINTR;
|
|
break;
|
|
}
|
|
/* fallthrough */
|
|
case ERESTARTNOINTR:
|
|
regs->regs[7] = regs->regs[26];
|
|
regs->regs[2] = regs->regs[0];
|
|
regs->cp0_epc -= 4;
|
|
}
|
|
|
|
regs->regs[0] = 0; /* Don't deal with this again. */
|
|
}
|
|
|
|
if (sig_uses_siginfo(ka))
|
|
ret = abi->setup_rt_frame(vdso + abi->rt_signal_return_offset,
|
|
ka, regs, sig, oldset, info);
|
|
else
|
|
ret = abi->setup_frame(vdso + abi->signal_return_offset,
|
|
ka, regs, sig, oldset);
|
|
|
|
if (ret)
|
|
return;
|
|
|
|
signal_delivered(sig, info, ka, regs, 0);
|
|
}
|
|
|
|
static void do_signal(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;
|
|
|
|
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
|
|
if (signr > 0) {
|
|
/* Whee! Actually deliver the signal. */
|
|
handle_signal(signr, &info, &ka, regs);
|
|
return;
|
|
}
|
|
|
|
if (regs->regs[0]) {
|
|
if (regs->regs[2] == ERESTARTNOHAND ||
|
|
regs->regs[2] == ERESTARTSYS ||
|
|
regs->regs[2] == ERESTARTNOINTR) {
|
|
regs->regs[2] = regs->regs[0];
|
|
regs->regs[7] = regs->regs[26];
|
|
regs->cp0_epc -= 4;
|
|
}
|
|
if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
|
|
regs->regs[2] = current->thread.abi->restart;
|
|
regs->regs[7] = regs->regs[26];
|
|
regs->cp0_epc -= 4;
|
|
}
|
|
regs->regs[0] = 0; /* Don't deal with this again. */
|
|
}
|
|
|
|
/*
|
|
* If there's no signal to deliver, we just put the saved sigmask
|
|
* back
|
|
*/
|
|
restore_saved_sigmask();
|
|
}
|
|
|
|
/*
|
|
* notification of userspace execution resumption
|
|
* - triggered by the TIF_WORK_MASK flags
|
|
*/
|
|
asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused,
|
|
__u32 thread_info_flags)
|
|
{
|
|
local_irq_enable();
|
|
|
|
/* deal with pending signal delivery */
|
|
if (thread_info_flags & _TIF_SIGPENDING)
|
|
do_signal(regs);
|
|
|
|
if (thread_info_flags & _TIF_NOTIFY_RESUME) {
|
|
clear_thread_flag(TIF_NOTIFY_RESUME);
|
|
tracehook_notify_resume(regs);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
static int smp_save_fp_context(struct sigcontext __user *sc)
|
|
{
|
|
return raw_cpu_has_fpu
|
|
? _save_fp_context(sc)
|
|
: fpu_emulator_save_context(sc);
|
|
}
|
|
|
|
static int smp_restore_fp_context(struct sigcontext __user *sc)
|
|
{
|
|
return raw_cpu_has_fpu
|
|
? _restore_fp_context(sc)
|
|
: fpu_emulator_restore_context(sc);
|
|
}
|
|
#endif
|
|
|
|
static int signal_setup(void)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
/* For now just do the cpu_has_fpu check when the functions are invoked */
|
|
save_fp_context = smp_save_fp_context;
|
|
restore_fp_context = smp_restore_fp_context;
|
|
#else
|
|
if (cpu_has_fpu) {
|
|
save_fp_context = _save_fp_context;
|
|
restore_fp_context = _restore_fp_context;
|
|
} else {
|
|
save_fp_context = fpu_emulator_save_context;
|
|
restore_fp_context = fpu_emulator_restore_context;
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
arch_initcall(signal_setup);
|