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m68knommu: Switch to saner sigsuspend

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Al Viro 2010-10-11 17:09:20 -04:00 committed by Geert Uytterhoeven
parent bf814b45d5
commit 710e91e455
6 changed files with 22 additions and 68 deletions
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2
arch/m68k/include/asm/unistd.h
View file

@ -373,9 +373,7 @@
#define __ARCH_WANT_SYS_SIGPENDING
#define __ARCH_WANT_SYS_SIGPROCMASK
#define __ARCH_WANT_SYS_RT_SIGACTION
#ifndef __uClinux__
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#endif
/*
* "Conditional" syscalls

16
arch/m68knommu/kernel/entry.S
View file

@ -112,22 +112,6 @@ ENTRY(sys_clone)
RESTORE_SWITCH_STACK
rts
ENTRY(sys_sigsuspend)
SAVE_SWITCH_STACK
pea %sp@(SWITCH_STACK_SIZE)
jbsr do_sigsuspend
addql #4,%sp
RESTORE_SWITCH_STACK
rts
ENTRY(sys_rt_sigsuspend)
SAVE_SWITCH_STACK
pea %sp@(SWITCH_STACK_SIZE)
jbsr do_rt_sigsuspend
addql #4,%sp
RESTORE_SWITCH_STACK
rts
ENTRY(sys_sigreturn)
SAVE_SWITCH_STACK
jbsr do_sigreturn

63
arch/m68knommu/kernel/signal.c
View file

@ -53,60 +53,25 @@
void ret_from_user_signal(void);
void ret_from_user_rt_signal(void);
asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs);
/*
* Atomically swap in the new signal mask, and wait for a signal.
*/
asmlinkage int do_sigsuspend(struct pt_regs *regs)
asmlinkage int
sys_sigsuspend(int unused0, int unused1, old_sigset_t mask)
{
old_sigset_t mask = regs->d3;
sigset_t saveset;
mask &= _BLOCKABLE;
spin_lock_irq(&current->sighand->siglock);
saveset = current->blocked;
current->saved_sigmask = current->blocked;
siginitset(&current->blocked, mask);
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
regs->d0 = -EINTR;
while (1) {
current->state = TASK_INTERRUPTIBLE;
schedule();
if (do_signal(&saveset, regs))
return -EINTR;
}
}
current->state = TASK_INTERRUPTIBLE;
schedule();
set_restore_sigmask();
asmlinkage int
do_rt_sigsuspend(struct pt_regs *regs)
{
sigset_t *unewset = (sigset_t *)regs->d1;
size_t sigsetsize = (size_t)regs->d2;
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(&current->sighand->siglock);
saveset = current->blocked;
current->blocked = newset;
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
regs->d0 = -EINTR;
while (1) {
current->state = TASK_INTERRUPTIBLE;
schedule();
if (do_signal(&saveset, regs))
return -EINTR;
}
return -ERESTARTNOHAND;
}
asmlinkage int
@ -752,11 +717,12 @@ handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
* want to handle. Thus you cannot kill init even with a SIGKILL even by
* mistake.
*/
asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs)
asmlinkage int do_signal(struct pt_regs *regs)
{
struct k_sigaction ka;
siginfo_t info;
int signr;
sigset_t *oldset;
/*
* We want the common case to go fast, which
@ -767,13 +733,16 @@ asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs)
if (!user_mode(regs))
return 1;
if (!oldset)
if (test_thread_flag(TIF_RESTORE_SIGMASK))
oldset = &current->saved_sigmask;
else
oldset = &current->blocked;
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
if (signr > 0) {
/* Whee! Actually deliver the signal. */
handle_signal(signr, &ka, &info, oldset, regs);
clear_thread_flag(TIF_RESTORE_SIGMASK);
return 1;
}
@ -782,5 +751,11 @@ asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs)
/* Restart the system call - no handlers present */
handle_restart(regs, NULL, 0);
}
/* If there's no signal to deliver, we just restore the saved mask. */
if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
clear_thread_flag(TIF_RESTORE_SIGMASK);
sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
}
return 0;
}

3
arch/m68knommu/platform/68328/entry.S
View file

@ -120,9 +120,8 @@ Lsignal_return:
subql #4,%sp /* dummy return address*/
SAVE_SWITCH_STACK
pea %sp@(SWITCH_STACK_SIZE)
clrl %sp@-
bsrw do_signal
addql #8,%sp
addql #4,%sp
RESTORE_SWITCH_STACK
addql #4,%sp
Lreturn:

3
arch/m68knommu/platform/68360/entry.S
View file

@ -116,9 +116,8 @@ Lsignal_return:
subql #4,%sp /* dummy return address*/
SAVE_SWITCH_STACK
pea %sp@(SWITCH_STACK_SIZE)
clrl %sp@-
bsrw do_signal
addql #8,%sp
addql #4,%sp
RESTORE_SWITCH_STACK
addql #4,%sp
Lreturn:

3
arch/m68knommu/platform/coldfire/entry.S
View file

@ -167,9 +167,8 @@ Lsignal_return:
subql #4,%sp /* dummy return address */
SAVE_SWITCH_STACK
pea %sp@(SWITCH_STACK_SIZE)
clrl %sp@-
jsr do_signal
addql #8,%sp
addql #4,%sp
RESTORE_SWITCH_STACK
addql #4,%sp
jmp Lreturn