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[SPARC]: Add support for *at(), ppoll, and pselect syscalls.

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This also includes by necessity _TIF_RESTORE_SIGMASK support,
which actually resulted in a lot of cleanups.

The sparc signal handling code is quite a mess and I should
clean it up some day.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2006-01-19 02:42:49 -08:00
parent f7111ceb52
commit 2d7d5f0511
16 changed files with 189 additions and 427 deletions
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122
arch/sparc64/kernel/signal32.c
View File

@@ -32,9 +32,6 @@
#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
int do_signal32(sigset_t *oldset, struct pt_regs *regs,
unsigned long orig_o0, int ret_from_syscall);
/* Signal frames: the original one (compatible with SunOS):
*
* Set up a signal frame... Make the stack look the way SunOS
@@ -226,102 +223,6 @@ int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
return 0;
}
/*
* atomically swap in the new signal mask, and wait for a signal.
* This is really tricky on the Sparc, watch out...
*/
asmlinkage void _sigpause32_common(compat_old_sigset_t set, struct pt_regs *regs)
{
sigset_t saveset;
set &= _BLOCKABLE;
spin_lock_irq(&current->sighand->siglock);
saveset = current->blocked;
siginitset(&current->blocked, set);
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
regs->tpc = regs->tnpc;
regs->tnpc += 4;
if (test_thread_flag(TIF_32BIT)) {
regs->tpc &= 0xffffffff;
regs->tnpc &= 0xffffffff;
}
/* Condition codes and return value where set here for sigpause,
* and so got used by setup_frame, which again causes sigreturn()
* to return -EINTR.
*/
while (1) {
current->state = TASK_INTERRUPTIBLE;
schedule();
/*
* Return -EINTR and set condition code here,
* so the interrupted system call actually returns
* these.
*/
regs->tstate |= TSTATE_ICARRY;
regs->u_regs[UREG_I0] = EINTR;
if (do_signal32(&saveset, regs, 0, 0))
return;
}
}
asmlinkage void do_rt_sigsuspend32(u32 uset, size_t sigsetsize, struct pt_regs *regs)
{
sigset_t oldset, set;
compat_sigset_t set32;
/* XXX: Don't preclude handling different sized sigset_t's. */
if (((compat_size_t)sigsetsize) != sizeof(sigset_t)) {
regs->tstate |= TSTATE_ICARRY;
regs->u_regs[UREG_I0] = EINVAL;
return;
}
if (copy_from_user(&set32, compat_ptr(uset), sizeof(set32))) {
regs->tstate |= TSTATE_ICARRY;
regs->u_regs[UREG_I0] = EFAULT;
return;
}
switch (_NSIG_WORDS) {
case 4: set.sig[3] = set32.sig[6] + (((long)set32.sig[7]) << 32);
case 3: set.sig[2] = set32.sig[4] + (((long)set32.sig[5]) << 32);
case 2: set.sig[1] = set32.sig[2] + (((long)set32.sig[3]) << 32);
case 1: set.sig[0] = set32.sig[0] + (((long)set32.sig[1]) << 32);
}
sigdelsetmask(&set, ~_BLOCKABLE);
spin_lock_irq(&current->sighand->siglock);
oldset = current->blocked;
current->blocked = set;
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
regs->tpc = regs->tnpc;
regs->tnpc += 4;
if (test_thread_flag(TIF_32BIT)) {
regs->tpc &= 0xffffffff;
regs->tnpc &= 0xffffffff;
}
/* Condition codes and return value where set here for sigpause,
* and so got used by setup_frame, which again causes sigreturn()
* to return -EINTR.
*/
while (1) {
current->state = TASK_INTERRUPTIBLE;
schedule();
/*
* Return -EINTR and set condition code here,
* so the interrupted system call actually returns
* these.
*/
regs->tstate |= TSTATE_ICARRY;
regs->u_regs[UREG_I0] = EINTR;
if (do_signal32(&oldset, regs, 0, 0))
return;
}
}
static int restore_fpu_state32(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
{
unsigned long *fpregs = current_thread_info()->fpregs;
@@ -1362,8 +1263,8 @@ static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs
* want to handle. Thus you cannot kill init even with a SIGKILL even by
* mistake.
*/
int do_signal32(sigset_t *oldset, struct pt_regs * regs,
unsigned long orig_i0, int restart_syscall)
void do_signal32(sigset_t *oldset, struct pt_regs * regs,
unsigned long orig_i0, int restart_syscall)
{
siginfo_t info;
struct signal_deliver_cookie cookie;
@@ -1380,7 +1281,15 @@ int do_signal32(sigset_t *oldset, struct pt_regs * regs,
syscall_restart32(orig_i0, regs, &ka.sa);
handle_signal32(signr, &ka, &info, oldset,
regs, svr4_signal);
return 1;
/* 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;
}
if (cookie.restart_syscall &&
(regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
@@ -1397,7 +1306,14 @@ int do_signal32(sigset_t *oldset, struct pt_regs * regs,
regs->tpc -= 4;
regs->tnpc -= 4;
}
return 0;
/* 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);
}
}
struct sigstack32 {