6ab3d5624e
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
540 lines
15 KiB
C
540 lines
15 KiB
C
/*
|
|
* linux/arch/arm26/kernel/signal.c
|
|
*
|
|
* Copyright (C) 1995-2002 Russell King
|
|
* Copyright (C) 2003 Ian Molton (ARM26)
|
|
*
|
|
* FIXME!!! This is probably very broken (13/05/2003)
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/personality.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/binfmts.h>
|
|
#include <linux/elf.h>
|
|
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/ucontext.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/unistd.h>
|
|
|
|
#include "ptrace.h"
|
|
|
|
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
|
|
|
|
/*
|
|
* For ARM syscalls, we encode the syscall number into the instruction.
|
|
*/
|
|
#define SWI_SYS_SIGRETURN (0xef000000|(__NR_sigreturn))
|
|
#define SWI_SYS_RT_SIGRETURN (0xef000000|(__NR_rt_sigreturn))
|
|
|
|
static int do_signal(sigset_t *oldset, struct pt_regs * regs, int syscall);
|
|
|
|
/*
|
|
* atomically swap in the new signal mask, and wait for a signal.
|
|
*/
|
|
asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask, struct pt_regs *regs)
|
|
{
|
|
sigset_t saveset;
|
|
|
|
mask &= _BLOCKABLE;
|
|
spin_lock_irq(¤t->sighand->siglock);
|
|
saveset = current->blocked;
|
|
siginitset(¤t->blocked, mask);
|
|
recalc_sigpending();
|
|
spin_unlock_irq(¤t->sighand->siglock);
|
|
regs->ARM_r0 = -EINTR;
|
|
|
|
while (1) {
|
|
current->state = TASK_INTERRUPTIBLE;
|
|
schedule();
|
|
if (do_signal(&saveset, regs, 0))
|
|
return regs->ARM_r0;
|
|
}
|
|
}
|
|
|
|
asmlinkage int
|
|
sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, struct pt_regs *regs)
|
|
{
|
|
sigset_t saveset, newset;
|
|
|
|
/* XXX: Don't preclude handling different sized sigset_t's. */
|
|
if (sigsetsize != sizeof(sigset_t))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(&newset, unewset, sizeof(newset)))
|
|
return -EFAULT;
|
|
sigdelsetmask(&newset, ~_BLOCKABLE);
|
|
|
|
spin_lock_irq(¤t->sighand->siglock);
|
|
saveset = current->blocked;
|
|
current->blocked = newset;
|
|
recalc_sigpending();
|
|
spin_unlock_irq(¤t->sighand->siglock);
|
|
regs->ARM_r0 = -EINTR;
|
|
|
|
while (1) {
|
|
current->state = TASK_INTERRUPTIBLE;
|
|
schedule();
|
|
if (do_signal(&saveset, regs, 0))
|
|
return regs->ARM_r0;
|
|
}
|
|
}
|
|
|
|
asmlinkage int
|
|
sys_sigaction(int sig, const struct old_sigaction *act,
|
|
struct old_sigaction *oact)
|
|
{
|
|
struct k_sigaction new_ka, old_ka;
|
|
int ret;
|
|
|
|
if (act) {
|
|
old_sigset_t mask;
|
|
if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
|
|
__get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
|
|
__get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
|
|
return -EFAULT;
|
|
__get_user(new_ka.sa.sa_flags, &act->sa_flags);
|
|
__get_user(mask, &act->sa_mask);
|
|
siginitset(&new_ka.sa.sa_mask, mask);
|
|
}
|
|
|
|
ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
|
|
|
|
if (!ret && oact) {
|
|
if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
|
|
__put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
|
|
__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
|
|
return -EFAULT;
|
|
__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
|
|
__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Do a signal return; undo the signal stack.
|
|
*/
|
|
struct sigframe
|
|
{
|
|
struct sigcontext sc;
|
|
unsigned long extramask[_NSIG_WORDS-1];
|
|
unsigned long retcode;
|
|
};
|
|
|
|
struct rt_sigframe
|
|
{
|
|
struct siginfo *pinfo;
|
|
void *puc;
|
|
struct siginfo info;
|
|
struct ucontext uc;
|
|
unsigned long retcode;
|
|
};
|
|
|
|
static int
|
|
restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
|
|
{
|
|
int err = 0;
|
|
|
|
__get_user_error(regs->ARM_r0, &sc->arm_r0, err);
|
|
__get_user_error(regs->ARM_r1, &sc->arm_r1, err);
|
|
__get_user_error(regs->ARM_r2, &sc->arm_r2, err);
|
|
__get_user_error(regs->ARM_r3, &sc->arm_r3, err);
|
|
__get_user_error(regs->ARM_r4, &sc->arm_r4, err);
|
|
__get_user_error(regs->ARM_r5, &sc->arm_r5, err);
|
|
__get_user_error(regs->ARM_r6, &sc->arm_r6, err);
|
|
__get_user_error(regs->ARM_r7, &sc->arm_r7, err);
|
|
__get_user_error(regs->ARM_r8, &sc->arm_r8, err);
|
|
__get_user_error(regs->ARM_r9, &sc->arm_r9, err);
|
|
__get_user_error(regs->ARM_r10, &sc->arm_r10, err);
|
|
__get_user_error(regs->ARM_fp, &sc->arm_fp, err);
|
|
__get_user_error(regs->ARM_ip, &sc->arm_ip, err);
|
|
__get_user_error(regs->ARM_sp, &sc->arm_sp, err);
|
|
__get_user_error(regs->ARM_lr, &sc->arm_lr, err);
|
|
__get_user_error(regs->ARM_pc, &sc->arm_pc, err);
|
|
|
|
err |= !valid_user_regs(regs);
|
|
|
|
return err;
|
|
}
|
|
|
|
asmlinkage int sys_sigreturn(struct pt_regs *regs)
|
|
{
|
|
struct sigframe *frame;
|
|
sigset_t set;
|
|
|
|
/*
|
|
* Since we stacked the signal on a 64-bit boundary,
|
|
* then 'sp' should be word aligned here. If it's
|
|
* not, then the user is trying to mess with us.
|
|
*/
|
|
if (regs->ARM_sp & 7)
|
|
goto badframe;
|
|
|
|
frame = (struct sigframe *)regs->ARM_sp;
|
|
|
|
if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
|
|
goto badframe;
|
|
if (__get_user(set.sig[0], &frame->sc.oldmask)
|
|
|| (_NSIG_WORDS > 1
|
|
&& __copy_from_user(&set.sig[1], &frame->extramask,
|
|
sizeof(frame->extramask))))
|
|
goto badframe;
|
|
|
|
sigdelsetmask(&set, ~_BLOCKABLE);
|
|
spin_lock_irq(¤t->sighand->siglock);
|
|
current->blocked = set;
|
|
recalc_sigpending();
|
|
spin_unlock_irq(¤t->sighand->siglock);
|
|
|
|
if (restore_sigcontext(regs, &frame->sc))
|
|
goto badframe;
|
|
|
|
/* Send SIGTRAP if we're single-stepping */
|
|
if (current->ptrace & PT_SINGLESTEP) {
|
|
ptrace_cancel_bpt(current);
|
|
send_sig(SIGTRAP, current, 1);
|
|
}
|
|
|
|
return regs->ARM_r0;
|
|
|
|
badframe:
|
|
force_sig(SIGSEGV, current);
|
|
return 0;
|
|
}
|
|
|
|
asmlinkage int sys_rt_sigreturn(struct pt_regs *regs)
|
|
{
|
|
struct rt_sigframe *frame;
|
|
sigset_t set;
|
|
|
|
/*
|
|
* Since we stacked the signal on a 64-bit boundary,
|
|
* then 'sp' should be word aligned here. If it's
|
|
* not, then the user is trying to mess with us.
|
|
*/
|
|
if (regs->ARM_sp & 7)
|
|
goto badframe;
|
|
|
|
frame = (struct rt_sigframe *)regs->ARM_sp;
|
|
|
|
if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
|
|
goto badframe;
|
|
if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
|
|
goto badframe;
|
|
|
|
sigdelsetmask(&set, ~_BLOCKABLE);
|
|
spin_lock_irq(¤t->sighand->siglock);
|
|
current->blocked = set;
|
|
recalc_sigpending();
|
|
spin_unlock_irq(¤t->sighand->siglock);
|
|
|
|
if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
|
|
goto badframe;
|
|
|
|
/* Send SIGTRAP if we're single-stepping */
|
|
if (current->ptrace & PT_SINGLESTEP) {
|
|
ptrace_cancel_bpt(current);
|
|
send_sig(SIGTRAP, current, 1);
|
|
}
|
|
|
|
return regs->ARM_r0;
|
|
|
|
badframe:
|
|
force_sig(SIGSEGV, current);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
setup_sigcontext(struct sigcontext *sc, /*struct _fpstate *fpstate,*/
|
|
struct pt_regs *regs, unsigned long mask)
|
|
{
|
|
int err = 0;
|
|
|
|
__put_user_error(regs->ARM_r0, &sc->arm_r0, err);
|
|
__put_user_error(regs->ARM_r1, &sc->arm_r1, err);
|
|
__put_user_error(regs->ARM_r2, &sc->arm_r2, err);
|
|
__put_user_error(regs->ARM_r3, &sc->arm_r3, err);
|
|
__put_user_error(regs->ARM_r4, &sc->arm_r4, err);
|
|
__put_user_error(regs->ARM_r5, &sc->arm_r5, err);
|
|
__put_user_error(regs->ARM_r6, &sc->arm_r6, err);
|
|
__put_user_error(regs->ARM_r7, &sc->arm_r7, err);
|
|
__put_user_error(regs->ARM_r8, &sc->arm_r8, err);
|
|
__put_user_error(regs->ARM_r9, &sc->arm_r9, err);
|
|
__put_user_error(regs->ARM_r10, &sc->arm_r10, err);
|
|
__put_user_error(regs->ARM_fp, &sc->arm_fp, err);
|
|
__put_user_error(regs->ARM_ip, &sc->arm_ip, err);
|
|
__put_user_error(regs->ARM_sp, &sc->arm_sp, err);
|
|
__put_user_error(regs->ARM_lr, &sc->arm_lr, err);
|
|
__put_user_error(regs->ARM_pc, &sc->arm_pc, err);
|
|
|
|
__put_user_error(current->thread.trap_no, &sc->trap_no, err);
|
|
__put_user_error(current->thread.error_code, &sc->error_code, err);
|
|
__put_user_error(current->thread.address, &sc->fault_address, err);
|
|
__put_user_error(mask, &sc->oldmask, err);
|
|
|
|
return err;
|
|
}
|
|
|
|
static inline void *
|
|
get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, int framesize)
|
|
{
|
|
unsigned long sp = regs->ARM_sp;
|
|
|
|
/*
|
|
* This is the X/Open sanctioned signal stack switching.
|
|
*/
|
|
if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
|
|
sp = current->sas_ss_sp + current->sas_ss_size;
|
|
|
|
/*
|
|
* ATPCS B01 mandates 8-byte alignment
|
|
*/
|
|
return (void *)((sp - framesize) & ~7);
|
|
}
|
|
|
|
static int
|
|
setup_return(struct pt_regs *regs, struct k_sigaction *ka,
|
|
unsigned long *rc, void *frame, int usig)
|
|
{
|
|
unsigned long handler = (unsigned long)ka->sa.sa_handler;
|
|
unsigned long retcode;
|
|
|
|
if (ka->sa.sa_flags & SA_RESTORER) {
|
|
retcode = (unsigned long)ka->sa.sa_restorer;
|
|
} else {
|
|
|
|
if (__put_user((ka->sa.sa_flags & SA_SIGINFO)?SWI_SYS_RT_SIGRETURN:SWI_SYS_SIGRETURN, rc))
|
|
return 1;
|
|
|
|
retcode = ((unsigned long)rc);
|
|
}
|
|
|
|
regs->ARM_r0 = usig;
|
|
regs->ARM_sp = (unsigned long)frame;
|
|
regs->ARM_lr = retcode;
|
|
regs->ARM_pc = handler & ~3;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
setup_frame(int usig, struct k_sigaction *ka, sigset_t *set, struct pt_regs *regs)
|
|
{
|
|
struct sigframe *frame = get_sigframe(ka, regs, sizeof(*frame));
|
|
int err = 0;
|
|
|
|
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
|
|
return 1;
|
|
|
|
err |= setup_sigcontext(&frame->sc, /*&frame->fpstate,*/ regs, set->sig[0]);
|
|
|
|
if (_NSIG_WORDS > 1) {
|
|
err |= __copy_to_user(frame->extramask, &set->sig[1],
|
|
sizeof(frame->extramask));
|
|
}
|
|
|
|
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 *frame = get_sigframe(ka, regs, sizeof(*frame));
|
|
int err = 0;
|
|
|
|
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
|
|
return 1;
|
|
|
|
__put_user_error(&frame->info, &frame->pinfo, err);
|
|
__put_user_error(&frame->uc, &frame->puc, err);
|
|
err |= copy_siginfo_to_user(&frame->info, info);
|
|
|
|
/* Clear all the bits of the ucontext we don't use. */
|
|
err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));
|
|
|
|
err |= setup_sigcontext(&frame->uc.uc_mcontext, /*&frame->fpstate,*/
|
|
regs, set->sig[0]);
|
|
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
|
|
|
|
if (err == 0)
|
|
err = setup_return(regs, ka, &frame->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->pinfo;
|
|
regs->ARM_r2 = (unsigned long)frame->puc;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static inline void restart_syscall(struct pt_regs *regs)
|
|
{
|
|
regs->ARM_r0 = regs->ARM_ORIG_r0;
|
|
regs->ARM_pc -= 4;
|
|
}
|
|
|
|
/*
|
|
* OK, we're invoking a handler
|
|
*/
|
|
static void
|
|
handle_signal(unsigned long sig, siginfo_t *info, sigset_t *oldset,
|
|
struct pt_regs * regs, int syscall)
|
|
{
|
|
struct thread_info *thread = current_thread_info();
|
|
struct task_struct *tsk = current;
|
|
struct k_sigaction *ka = &tsk->sighand->action[sig-1];
|
|
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:
|
|
current_thread_info()->restart_block.fn =
|
|
do_no_restart_syscall;
|
|
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) {
|
|
if (ka->sa.sa_flags & SA_ONESHOT)
|
|
ka->sa.sa_handler = SIG_DFL;
|
|
|
|
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);
|
|
return;
|
|
}
|
|
|
|
force_sigsegv(sig, tsk);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
siginfo_t info;
|
|
int signr;
|
|
struct k_sigaction ka;
|
|
|
|
/*
|
|
* 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 (current->ptrace & PT_SINGLESTEP)
|
|
ptrace_cancel_bpt(current);
|
|
|
|
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
|
|
if (signr > 0) {
|
|
handle_signal(signr, &info, oldset, regs, syscall);
|
|
if (current->ptrace & PT_SINGLESTEP)
|
|
ptrace_set_bpt(current);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* No signal to deliver to the process - restart the syscall.
|
|
*/
|
|
if (syscall) {
|
|
if (regs->ARM_r0 == -ERESTART_RESTARTBLOCK) {
|
|
u32 *usp;
|
|
|
|
regs->ARM_sp -= 12;
|
|
usp = (u32 *)regs->ARM_sp;
|
|
|
|
put_user(regs->ARM_pc, &usp[0]);
|
|
/* swi __NR_restart_syscall */
|
|
put_user(0xef000000 | __NR_restart_syscall, &usp[1]);
|
|
/* ldr pc, [sp], #12 */
|
|
// FIXME!!! is #12 correct there?
|
|
put_user(0xe49df00c, &usp[2]);
|
|
|
|
regs->ARM_pc = regs->ARM_sp + 4;
|
|
}
|
|
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);
|
|
}
|