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[MIPS] signals: Share even more code.

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native and compat do_signal and handle_signal are identical and can easily
be unified.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle
2007-02-15 11:40:37 +00:00
parent 38201fb23c
commit 151fd6acd9
7 changed files with 35 additions and 164 deletions
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118
arch/mips/kernel/signal32.c
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@ -104,7 +104,7 @@ typedef struct compat_siginfo {
*/
#define __NR_O32_sigreturn 4119
#define __NR_O32_rt_sigreturn 4193
#define __NR_O32_restart_syscall 4253
#define __NR_O32_restart_syscall 4253
/* 32-bit compatibility types */
@ -598,7 +598,7 @@ badframe:
force_sig(SIGSEGV, current);
}
int setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
static int setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
int signr, sigset_t *set)
{
struct sigframe32 __user *frame;
@ -644,7 +644,7 @@ give_sigsegv:
return -EFAULT;
}
int setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
static int setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
int signr, sigset_t *set, siginfo_t *info)
{
struct rt_sigframe32 __user *frame;
@ -704,110 +704,14 @@ give_sigsegv:
return -EFAULT;
}
static inline int handle_signal(unsigned long sig, siginfo_t *info,
struct k_sigaction *ka, sigset_t *oldset, struct pt_regs * regs)
{
int ret;
switch (regs->regs[0]) {
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: /* Userland will reload $v0. */
regs->regs[7] = regs->regs[26];
regs->cp0_epc -= 8;
}
regs->regs[0] = 0; /* Don't deal with this again. */
if (ka->sa.sa_flags & SA_SIGINFO)
ret = current->thread.abi->setup_rt_frame(ka, regs, sig, oldset, info);
else
ret = current->thread.abi->setup_frame(ka, regs, sig, oldset);
spin_lock_irq(&current->sighand->siglock);
sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
if (!(ka->sa.sa_flags & SA_NODEFER))
sigaddset(&current->blocked,sig);
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
return ret;
}
void do_signal32(struct pt_regs *regs)
{
struct k_sigaction ka;
sigset_t *oldset;
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;
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. */
if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
/*
* A signal was successfully delivered; the saved
* sigmask will have been stored in the signal frame,
* and will be restored by sigreturn, so we can simply
* clear the TIF_RESTORE_SIGMASK flag.
*/
if (test_thread_flag(TIF_RESTORE_SIGMASK))
clear_thread_flag(TIF_RESTORE_SIGMASK);
}
return;
}
/*
* Who's code doesn't conform to the restartable syscall convention
* dies here!!! The li instruction, a single machine instruction,
* must directly be followed by the syscall instruction.
*/
if (regs->regs[0]) {
if (regs->regs[2] == ERESTARTNOHAND ||
regs->regs[2] == ERESTARTSYS ||
regs->regs[2] == ERESTARTNOINTR) {
regs->regs[7] = regs->regs[26];
regs->cp0_epc -= 8;
}
if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
regs->regs[2] = __NR_O32_restart_syscall;
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
*/
if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
clear_thread_flag(TIF_RESTORE_SIGMASK);
sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
}
}
/*
* o32 compatibility on 64-bit kernels, without DSP ASE
*/
struct mips_abi mips_abi_32 = {
.setup_frame = setup_frame_32,
.setup_rt_frame = setup_rt_frame_32,
.restart = __NR_O32_restart_syscall
};
asmlinkage int sys32_rt_sigaction(int sig, const struct sigaction32 __user *act,
struct sigaction32 __user *oact,