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ea14fad0d4
* 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm: (76 commits) [ARM] 4002/1: S3C24XX: leave parent IRQs unmasked [ARM] 4001/1: S3C24XX: shorten reboot time [ARM] 3983/2: remove unused argument to __bug() [ARM] 4000/1: Osiris: add third serial port in [ARM] 3999/1: RX3715: suspend to RAM support [ARM] 3998/1: VR1000: LED platform devices [ARM] 3995/1: iop13xx: add iop13xx support [ARM] 3968/1: iop13xx: add iop13xx_defconfig [ARM] Update mach-types [ARM] Allow gcc to optimise arm_add_memory a little more [ARM] 3991/1: i.MX/MX1 high resolution time source [ARM] 3990/1: i.MX/MX1 more precise PLL decode [ARM] 3986/1: H1940: suspend to RAM support [ARM] 3985/1: ixp4xx clocksource cleanup [ARM] 3984/1: ixp4xx/nslu2: Fix disk LED numbering (take 2) [ARM] 3994/1: ixp23xx: fix handling of pci master aborts [ARM] 3981/1: sched_clock for PXA2xx [ARM] 3980/1: extend the ARM Versatile sched_clock implementation from 32 to 63 bit [ARM] 3979/1: extend the SA11x0 sched_clock implementation from 32 to 63 bit period [ARM] 3978/1: macro to provide a 63-bit value from a 32-bit hardware counter ...
719 lines
19 KiB
C
719 lines
19 KiB
C
/*
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* linux/arch/arm/kernel/signal.c
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*
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* Copyright (C) 1995-2002 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/errno.h>
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#include <linux/signal.h>
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#include <linux/ptrace.h>
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#include <linux/personality.h>
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#include <linux/freezer.h>
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#include <asm/elf.h>
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#include <asm/cacheflush.h>
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#include <asm/ucontext.h>
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#include <asm/uaccess.h>
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#include <asm/unistd.h>
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#include "ptrace.h"
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#include "signal.h"
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#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
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/*
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* For ARM syscalls, we encode the syscall number into the instruction.
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*/
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#define SWI_SYS_SIGRETURN (0xef000000|(__NR_sigreturn))
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#define SWI_SYS_RT_SIGRETURN (0xef000000|(__NR_rt_sigreturn))
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/*
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* With EABI, the syscall number has to be loaded into r7.
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*/
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#define MOV_R7_NR_SIGRETURN (0xe3a07000 | (__NR_sigreturn - __NR_SYSCALL_BASE))
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#define MOV_R7_NR_RT_SIGRETURN (0xe3a07000 | (__NR_rt_sigreturn - __NR_SYSCALL_BASE))
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/*
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* For Thumb syscalls, we pass the syscall number via r7. We therefore
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* need two 16-bit instructions.
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*/
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#define SWI_THUMB_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_sigreturn - __NR_SYSCALL_BASE))
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#define SWI_THUMB_RT_SIGRETURN (0xdf00 << 16 | 0x2700 | (__NR_rt_sigreturn - __NR_SYSCALL_BASE))
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const unsigned long sigreturn_codes[7] = {
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MOV_R7_NR_SIGRETURN, SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN,
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MOV_R7_NR_RT_SIGRETURN, SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN,
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};
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static int do_signal(sigset_t *oldset, struct pt_regs * regs, int syscall);
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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 sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask, struct pt_regs *regs)
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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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regs->ARM_r0 = -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, 0))
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return regs->ARM_r0;
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}
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}
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asmlinkage int
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sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize, struct pt_regs *regs)
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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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regs->ARM_r0 = -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, 0))
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return regs->ARM_r0;
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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 __user *act,
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struct old_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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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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#ifdef CONFIG_CRUNCH
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static int preserve_crunch_context(struct crunch_sigframe *frame)
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{
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char kbuf[sizeof(*frame) + 8];
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struct crunch_sigframe *kframe;
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/* the crunch context must be 64 bit aligned */
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kframe = (struct crunch_sigframe *)((unsigned long)(kbuf + 8) & ~7);
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kframe->magic = CRUNCH_MAGIC;
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kframe->size = CRUNCH_STORAGE_SIZE;
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crunch_task_copy(current_thread_info(), &kframe->storage);
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return __copy_to_user(frame, kframe, sizeof(*frame));
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}
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static int restore_crunch_context(struct crunch_sigframe *frame)
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{
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char kbuf[sizeof(*frame) + 8];
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struct crunch_sigframe *kframe;
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/* the crunch context must be 64 bit aligned */
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kframe = (struct crunch_sigframe *)((unsigned long)(kbuf + 8) & ~7);
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if (__copy_from_user(kframe, frame, sizeof(*frame)))
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return -1;
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if (kframe->magic != CRUNCH_MAGIC ||
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kframe->size != CRUNCH_STORAGE_SIZE)
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return -1;
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crunch_task_restore(current_thread_info(), &kframe->storage);
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return 0;
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}
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#endif
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#ifdef CONFIG_IWMMXT
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static int preserve_iwmmxt_context(struct iwmmxt_sigframe *frame)
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{
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char kbuf[sizeof(*frame) + 8];
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struct iwmmxt_sigframe *kframe;
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/* the iWMMXt context must be 64 bit aligned */
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kframe = (struct iwmmxt_sigframe *)((unsigned long)(kbuf + 8) & ~7);
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kframe->magic = IWMMXT_MAGIC;
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kframe->size = IWMMXT_STORAGE_SIZE;
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iwmmxt_task_copy(current_thread_info(), &kframe->storage);
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return __copy_to_user(frame, kframe, sizeof(*frame));
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}
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static int restore_iwmmxt_context(struct iwmmxt_sigframe *frame)
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{
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char kbuf[sizeof(*frame) + 8];
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struct iwmmxt_sigframe *kframe;
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/* the iWMMXt context must be 64 bit aligned */
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kframe = (struct iwmmxt_sigframe *)((unsigned long)(kbuf + 8) & ~7);
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if (__copy_from_user(kframe, frame, sizeof(*frame)))
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return -1;
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if (kframe->magic != IWMMXT_MAGIC ||
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kframe->size != IWMMXT_STORAGE_SIZE)
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return -1;
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iwmmxt_task_restore(current_thread_info(), &kframe->storage);
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return 0;
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}
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#endif
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/*
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* Do a signal return; undo the signal stack. These are aligned to 64-bit.
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*/
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struct sigframe {
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struct ucontext uc;
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unsigned long retcode[2];
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};
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struct rt_sigframe {
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struct siginfo info;
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struct sigframe sig;
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};
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static int restore_sigframe(struct pt_regs *regs, struct sigframe __user *sf)
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{
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struct aux_sigframe __user *aux;
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sigset_t set;
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int err;
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err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set));
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if (err == 0) {
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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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}
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__get_user_error(regs->ARM_r0, &sf->uc.uc_mcontext.arm_r0, err);
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__get_user_error(regs->ARM_r1, &sf->uc.uc_mcontext.arm_r1, err);
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__get_user_error(regs->ARM_r2, &sf->uc.uc_mcontext.arm_r2, err);
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__get_user_error(regs->ARM_r3, &sf->uc.uc_mcontext.arm_r3, err);
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__get_user_error(regs->ARM_r4, &sf->uc.uc_mcontext.arm_r4, err);
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__get_user_error(regs->ARM_r5, &sf->uc.uc_mcontext.arm_r5, err);
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__get_user_error(regs->ARM_r6, &sf->uc.uc_mcontext.arm_r6, err);
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__get_user_error(regs->ARM_r7, &sf->uc.uc_mcontext.arm_r7, err);
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__get_user_error(regs->ARM_r8, &sf->uc.uc_mcontext.arm_r8, err);
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__get_user_error(regs->ARM_r9, &sf->uc.uc_mcontext.arm_r9, err);
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__get_user_error(regs->ARM_r10, &sf->uc.uc_mcontext.arm_r10, err);
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__get_user_error(regs->ARM_fp, &sf->uc.uc_mcontext.arm_fp, err);
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__get_user_error(regs->ARM_ip, &sf->uc.uc_mcontext.arm_ip, err);
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__get_user_error(regs->ARM_sp, &sf->uc.uc_mcontext.arm_sp, err);
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__get_user_error(regs->ARM_lr, &sf->uc.uc_mcontext.arm_lr, err);
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__get_user_error(regs->ARM_pc, &sf->uc.uc_mcontext.arm_pc, err);
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__get_user_error(regs->ARM_cpsr, &sf->uc.uc_mcontext.arm_cpsr, err);
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err |= !valid_user_regs(regs);
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aux = (struct aux_sigframe __user *) sf->uc.uc_regspace;
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#ifdef CONFIG_CRUNCH
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if (err == 0)
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err |= restore_crunch_context(&aux->crunch);
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#endif
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#ifdef CONFIG_IWMMXT
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if (err == 0 && test_thread_flag(TIF_USING_IWMMXT))
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err |= restore_iwmmxt_context(&aux->iwmmxt);
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#endif
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#ifdef CONFIG_VFP
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// if (err == 0)
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// err |= vfp_restore_state(&sf->aux.vfp);
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#endif
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return err;
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}
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asmlinkage int sys_sigreturn(struct pt_regs *regs)
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{
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struct sigframe __user *frame;
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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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/*
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* Since we stacked the signal on a 64-bit boundary,
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* then 'sp' should be word aligned here. If it's
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* not, then the user is trying to mess with us.
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*/
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if (regs->ARM_sp & 7)
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goto badframe;
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frame = (struct sigframe __user *)regs->ARM_sp;
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if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
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goto badframe;
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if (restore_sigframe(regs, frame))
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goto badframe;
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/* Send SIGTRAP if we're single-stepping */
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if (current->ptrace & PT_SINGLESTEP) {
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ptrace_cancel_bpt(current);
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send_sig(SIGTRAP, current, 1);
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}
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return regs->ARM_r0;
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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 sys_rt_sigreturn(struct pt_regs *regs)
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{
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struct rt_sigframe __user *frame;
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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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/*
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* Since we stacked the signal on a 64-bit boundary,
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* then 'sp' should be word aligned here. If it's
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* not, then the user is trying to mess with us.
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*/
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if (regs->ARM_sp & 7)
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goto badframe;
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frame = (struct rt_sigframe __user *)regs->ARM_sp;
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if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
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goto badframe;
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if (restore_sigframe(regs, &frame->sig))
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goto badframe;
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if (do_sigaltstack(&frame->sig.uc.uc_stack, NULL, regs->ARM_sp) == -EFAULT)
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goto badframe;
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/* Send SIGTRAP if we're single-stepping */
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if (current->ptrace & PT_SINGLESTEP) {
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ptrace_cancel_bpt(current);
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send_sig(SIGTRAP, current, 1);
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}
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return regs->ARM_r0;
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badframe:
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force_sig(SIGSEGV, current);
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return 0;
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}
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static int
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setup_sigframe(struct sigframe __user *sf, struct pt_regs *regs, sigset_t *set)
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{
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struct aux_sigframe __user *aux;
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int err = 0;
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__put_user_error(regs->ARM_r0, &sf->uc.uc_mcontext.arm_r0, err);
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__put_user_error(regs->ARM_r1, &sf->uc.uc_mcontext.arm_r1, err);
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__put_user_error(regs->ARM_r2, &sf->uc.uc_mcontext.arm_r2, err);
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__put_user_error(regs->ARM_r3, &sf->uc.uc_mcontext.arm_r3, err);
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__put_user_error(regs->ARM_r4, &sf->uc.uc_mcontext.arm_r4, err);
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__put_user_error(regs->ARM_r5, &sf->uc.uc_mcontext.arm_r5, err);
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__put_user_error(regs->ARM_r6, &sf->uc.uc_mcontext.arm_r6, err);
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__put_user_error(regs->ARM_r7, &sf->uc.uc_mcontext.arm_r7, err);
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__put_user_error(regs->ARM_r8, &sf->uc.uc_mcontext.arm_r8, err);
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__put_user_error(regs->ARM_r9, &sf->uc.uc_mcontext.arm_r9, err);
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__put_user_error(regs->ARM_r10, &sf->uc.uc_mcontext.arm_r10, err);
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__put_user_error(regs->ARM_fp, &sf->uc.uc_mcontext.arm_fp, err);
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__put_user_error(regs->ARM_ip, &sf->uc.uc_mcontext.arm_ip, err);
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__put_user_error(regs->ARM_sp, &sf->uc.uc_mcontext.arm_sp, err);
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__put_user_error(regs->ARM_lr, &sf->uc.uc_mcontext.arm_lr, err);
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__put_user_error(regs->ARM_pc, &sf->uc.uc_mcontext.arm_pc, err);
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__put_user_error(regs->ARM_cpsr, &sf->uc.uc_mcontext.arm_cpsr, err);
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|
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__put_user_error(current->thread.trap_no, &sf->uc.uc_mcontext.trap_no, err);
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__put_user_error(current->thread.error_code, &sf->uc.uc_mcontext.error_code, err);
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__put_user_error(current->thread.address, &sf->uc.uc_mcontext.fault_address, err);
|
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__put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err);
|
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|
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err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(*set));
|
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|
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aux = (struct aux_sigframe __user *) sf->uc.uc_regspace;
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#ifdef CONFIG_CRUNCH
|
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if (err == 0)
|
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err |= preserve_crunch_context(&aux->crunch);
|
|
#endif
|
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#ifdef CONFIG_IWMMXT
|
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if (err == 0 && test_thread_flag(TIF_USING_IWMMXT))
|
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err |= preserve_iwmmxt_context(&aux->iwmmxt);
|
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#endif
|
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#ifdef CONFIG_VFP
|
|
// if (err == 0)
|
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// err |= vfp_save_state(&sf->aux.vfp);
|
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#endif
|
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__put_user_error(0, &aux->end_magic, err);
|
|
|
|
return err;
|
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}
|
|
|
|
static inline void __user *
|
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get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, int framesize)
|
|
{
|
|
unsigned long sp = regs->ARM_sp;
|
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void __user *frame;
|
|
|
|
/*
|
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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))
|
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sp = current->sas_ss_sp + current->sas_ss_size;
|
|
|
|
/*
|
|
* ATPCS B01 mandates 8-byte alignment
|
|
*/
|
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frame = (void __user *)((sp - framesize) & ~7);
|
|
|
|
/*
|
|
* Check that we can actually write to the signal frame.
|
|
*/
|
|
if (!access_ok(VERIFY_WRITE, frame, framesize))
|
|
frame = NULL;
|
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|
|
return frame;
|
|
}
|
|
|
|
static int
|
|
setup_return(struct pt_regs *regs, struct k_sigaction *ka,
|
|
unsigned long __user *rc, void __user *frame, int usig)
|
|
{
|
|
unsigned long handler = (unsigned long)ka->sa.sa_handler;
|
|
unsigned long retcode;
|
|
int thumb = 0;
|
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unsigned long cpsr = regs->ARM_cpsr & ~PSR_f;
|
|
|
|
/*
|
|
* Maybe we need to deliver a 32-bit signal to a 26-bit task.
|
|
*/
|
|
if (ka->sa.sa_flags & SA_THIRTYTWO)
|
|
cpsr = (cpsr & ~MODE_MASK) | USR_MODE;
|
|
|
|
#ifdef CONFIG_ARM_THUMB
|
|
if (elf_hwcap & HWCAP_THUMB) {
|
|
/*
|
|
* The LSB of the handler determines if we're going to
|
|
* be using THUMB or ARM mode for this signal handler.
|
|
*/
|
|
thumb = handler & 1;
|
|
|
|
if (thumb)
|
|
cpsr |= PSR_T_BIT;
|
|
else
|
|
cpsr &= ~PSR_T_BIT;
|
|
}
|
|
#endif
|
|
|
|
if (ka->sa.sa_flags & SA_RESTORER) {
|
|
retcode = (unsigned long)ka->sa.sa_restorer;
|
|
} else {
|
|
unsigned int idx = thumb << 1;
|
|
|
|
if (ka->sa.sa_flags & SA_SIGINFO)
|
|
idx += 3;
|
|
|
|
if (__put_user(sigreturn_codes[idx], rc) ||
|
|
__put_user(sigreturn_codes[idx+1], rc+1))
|
|
return 1;
|
|
|
|
if (cpsr & MODE32_BIT) {
|
|
/*
|
|
* 32-bit code can use the new high-page
|
|
* signal return code support.
|
|
*/
|
|
retcode = KERN_SIGRETURN_CODE + (idx << 2) + thumb;
|
|
} else {
|
|
/*
|
|
* Ensure that the instruction cache sees
|
|
* the return code written onto the stack.
|
|
*/
|
|
flush_icache_range((unsigned long)rc,
|
|
(unsigned long)(rc + 2));
|
|
|
|
retcode = ((unsigned long)rc) + thumb;
|
|
}
|
|
}
|
|
|
|
regs->ARM_r0 = usig;
|
|
regs->ARM_sp = (unsigned long)frame;
|
|
regs->ARM_lr = retcode;
|
|
regs->ARM_pc = handler;
|
|
regs->ARM_cpsr = cpsr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
setup_frame(int usig, struct k_sigaction *ka, sigset_t *set, struct pt_regs *regs)
|
|
{
|
|
struct sigframe __user *frame = get_sigframe(ka, regs, sizeof(*frame));
|
|
int err = 0;
|
|
|
|
if (!frame)
|
|
return 1;
|
|
|
|
/*
|
|
* Set uc.uc_flags to a value which sc.trap_no would never have.
|
|
*/
|
|
__put_user_error(0x5ac3c35a, &frame->uc.uc_flags, err);
|
|
|
|
err |= setup_sigframe(frame, regs, set);
|
|
if (err == 0)
|
|
err = setup_return(regs, ka, frame->retcode, frame, usig);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
|
|
sigset_t *set, struct pt_regs *regs)
|
|
{
|
|
struct rt_sigframe __user *frame = get_sigframe(ka, regs, sizeof(*frame));
|
|
stack_t stack;
|
|
int err = 0;
|
|
|
|
if (!frame)
|
|
return 1;
|
|
|
|
err |= copy_siginfo_to_user(&frame->info, info);
|
|
|
|
__put_user_error(0, &frame->sig.uc.uc_flags, err);
|
|
__put_user_error(NULL, &frame->sig.uc.uc_link, err);
|
|
|
|
memset(&stack, 0, sizeof(stack));
|
|
stack.ss_sp = (void __user *)current->sas_ss_sp;
|
|
stack.ss_flags = sas_ss_flags(regs->ARM_sp);
|
|
stack.ss_size = current->sas_ss_size;
|
|
err |= __copy_to_user(&frame->sig.uc.uc_stack, &stack, sizeof(stack));
|
|
|
|
err |= setup_sigframe(&frame->sig, regs, set);
|
|
if (err == 0)
|
|
err = setup_return(regs, ka, frame->sig.retcode, frame, usig);
|
|
|
|
if (err == 0) {
|
|
/*
|
|
* For realtime signals we must also set the second and third
|
|
* arguments for the signal handler.
|
|
* -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06
|
|
*/
|
|
regs->ARM_r1 = (unsigned long)&frame->info;
|
|
regs->ARM_r2 = (unsigned long)&frame->sig.uc;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static inline void restart_syscall(struct pt_regs *regs)
|
|
{
|
|
regs->ARM_r0 = regs->ARM_ORIG_r0;
|
|
regs->ARM_pc -= thumb_mode(regs) ? 2 : 4;
|
|
}
|
|
|
|
/*
|
|
* OK, we're invoking a handler
|
|
*/
|
|
static void
|
|
handle_signal(unsigned long sig, struct k_sigaction *ka,
|
|
siginfo_t *info, sigset_t *oldset,
|
|
struct pt_regs * regs, int syscall)
|
|
{
|
|
struct thread_info *thread = current_thread_info();
|
|
struct task_struct *tsk = current;
|
|
int usig = sig;
|
|
int ret;
|
|
|
|
/*
|
|
* If we were from a system call, check for system call restarting...
|
|
*/
|
|
if (syscall) {
|
|
switch (regs->ARM_r0) {
|
|
case -ERESTART_RESTARTBLOCK:
|
|
case -ERESTARTNOHAND:
|
|
regs->ARM_r0 = -EINTR;
|
|
break;
|
|
case -ERESTARTSYS:
|
|
if (!(ka->sa.sa_flags & SA_RESTART)) {
|
|
regs->ARM_r0 = -EINTR;
|
|
break;
|
|
}
|
|
/* fallthrough */
|
|
case -ERESTARTNOINTR:
|
|
restart_syscall(regs);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* translate the signal
|
|
*/
|
|
if (usig < 32 && thread->exec_domain && thread->exec_domain->signal_invmap)
|
|
usig = thread->exec_domain->signal_invmap[usig];
|
|
|
|
/*
|
|
* Set up the stack frame
|
|
*/
|
|
if (ka->sa.sa_flags & SA_SIGINFO)
|
|
ret = setup_rt_frame(usig, ka, info, oldset, regs);
|
|
else
|
|
ret = setup_frame(usig, ka, oldset, regs);
|
|
|
|
/*
|
|
* Check that the resulting registers are actually sane.
|
|
*/
|
|
ret |= !valid_user_regs(regs);
|
|
|
|
if (ret != 0) {
|
|
force_sigsegv(sig, tsk);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Block the signal if we were successful.
|
|
*/
|
|
spin_lock_irq(&tsk->sighand->siglock);
|
|
sigorsets(&tsk->blocked, &tsk->blocked,
|
|
&ka->sa.sa_mask);
|
|
if (!(ka->sa.sa_flags & SA_NODEFER))
|
|
sigaddset(&tsk->blocked, sig);
|
|
recalc_sigpending();
|
|
spin_unlock_irq(&tsk->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.
|
|
*
|
|
* Note that we go through the signals twice: once to check the signals that
|
|
* the kernel can handle, and then we build all the user-level signal handling
|
|
* stack-frames in one go after that.
|
|
*/
|
|
static int do_signal(sigset_t *oldset, struct pt_regs *regs, int syscall)
|
|
{
|
|
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 0;
|
|
|
|
if (try_to_freeze())
|
|
goto no_signal;
|
|
|
|
if (current->ptrace & PT_SINGLESTEP)
|
|
ptrace_cancel_bpt(current);
|
|
|
|
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
|
|
if (signr > 0) {
|
|
handle_signal(signr, &ka, &info, oldset, regs, syscall);
|
|
if (current->ptrace & PT_SINGLESTEP)
|
|
ptrace_set_bpt(current);
|
|
return 1;
|
|
}
|
|
|
|
no_signal:
|
|
/*
|
|
* No signal to deliver to the process - restart the syscall.
|
|
*/
|
|
if (syscall) {
|
|
if (regs->ARM_r0 == -ERESTART_RESTARTBLOCK) {
|
|
if (thumb_mode(regs)) {
|
|
regs->ARM_r7 = __NR_restart_syscall - __NR_SYSCALL_BASE;
|
|
regs->ARM_pc -= 2;
|
|
} else {
|
|
#if defined(CONFIG_AEABI) && !defined(CONFIG_OABI_COMPAT)
|
|
regs->ARM_r7 = __NR_restart_syscall;
|
|
regs->ARM_pc -= 4;
|
|
#else
|
|
u32 __user *usp;
|
|
u32 swival = __NR_restart_syscall;
|
|
|
|
regs->ARM_sp -= 12;
|
|
usp = (u32 __user *)regs->ARM_sp;
|
|
|
|
/*
|
|
* Either we supports OABI only, or we have
|
|
* EABI with the OABI compat layer enabled.
|
|
* In the later case we don't know if user
|
|
* space is EABI or not, and if not we must
|
|
* not clobber r7. Always using the OABI
|
|
* syscall solves that issue and works for
|
|
* all those cases.
|
|
*/
|
|
swival = swival - __NR_SYSCALL_BASE + __NR_OABI_SYSCALL_BASE;
|
|
|
|
put_user(regs->ARM_pc, &usp[0]);
|
|
/* swi __NR_restart_syscall */
|
|
put_user(0xef000000 | swival, &usp[1]);
|
|
/* ldr pc, [sp], #12 */
|
|
put_user(0xe49df00c, &usp[2]);
|
|
|
|
flush_icache_range((unsigned long)usp,
|
|
(unsigned long)(usp + 3));
|
|
|
|
regs->ARM_pc = regs->ARM_sp + 4;
|
|
#endif
|
|
}
|
|
}
|
|
if (regs->ARM_r0 == -ERESTARTNOHAND ||
|
|
regs->ARM_r0 == -ERESTARTSYS ||
|
|
regs->ARM_r0 == -ERESTARTNOINTR) {
|
|
restart_syscall(regs);
|
|
}
|
|
}
|
|
if (current->ptrace & PT_SINGLESTEP)
|
|
ptrace_set_bpt(current);
|
|
return 0;
|
|
}
|
|
|
|
asmlinkage void
|
|
do_notify_resume(struct pt_regs *regs, unsigned int thread_flags, int syscall)
|
|
{
|
|
if (thread_flags & _TIF_SIGPENDING)
|
|
do_signal(¤t->blocked, regs, syscall);
|
|
}
|