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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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117
arch/sparc/kernel/signal.c
View File

@@ -35,9 +35,6 @@ extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
void *fpqueue, unsigned long *fpqdepth);
extern void fpload(unsigned long *fpregs, unsigned long *fsr);
asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
unsigned long orig_o0, int restart_syscall);
/* Signal frames: the original one (compatible with SunOS):
*
* Set up a signal frame... Make the stack look the way SunOS
@@ -95,98 +92,30 @@ struct rt_signal_frame {
#define NF_ALIGNEDSZ (((sizeof(struct new_signal_frame) + 7) & (~7)))
#define RT_ALIGNEDSZ (((sizeof(struct rt_signal_frame) + 7) & (~7)))
/*
* atomically swap in the new signal mask, and wait for a signal.
* This is really tricky on the Sparc, watch out...
*/
asmlinkage void _sigpause_common(old_sigset_t set, struct pt_regs *regs)
static int _sigpause_common(old_sigset_t set)
{
sigset_t saveset;
set &= _BLOCKABLE;
spin_lock_irq(&current->sighand->siglock);
saveset = current->blocked;
current->saved_sigmask = current->blocked;
siginitset(&current->blocked, set);
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
regs->pc = regs->npc;
regs->npc += 4;
current->state = TASK_INTERRUPTIBLE;
schedule();
set_thread_flag(TIF_RESTORE_SIGMASK);
/* 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->psr |= PSR_C;
regs->u_regs[UREG_I0] = EINTR;
if (do_signal(&saveset, regs, 0, 0))
return;
}
return -ERESTARTNOHAND;
}
asmlinkage void do_sigpause(unsigned int set, struct pt_regs *regs)
asmlinkage int sys_sigpause(unsigned int set)
{
_sigpause_common(set, regs);
return _sigpause_common(set);
}
asmlinkage void do_sigsuspend (struct pt_regs *regs)
asmlinkage int sys_sigsuspend(old_sigset_t set)
{
_sigpause_common(regs->u_regs[UREG_I0], regs);
}
asmlinkage void do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize,
struct pt_regs *regs)
{
sigset_t oldset, set;
/* XXX: Don't preclude handling different sized sigset_t's. */
if (sigsetsize != sizeof(sigset_t)) {
regs->psr |= PSR_C;
regs->u_regs[UREG_I0] = EINVAL;
return;
}
if (copy_from_user(&set, uset, sizeof(set))) {
regs->psr |= PSR_C;
regs->u_regs[UREG_I0] = EFAULT;
return;
}
sigdelsetmask(&set, ~_BLOCKABLE);
spin_lock_irq(&current->sighand->siglock);
oldset = current->blocked;
current->blocked = set;
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
regs->pc = regs->npc;
regs->npc += 4;
/* 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->psr |= PSR_C;
regs->u_regs[UREG_I0] = EINTR;
if (do_signal(&oldset, regs, 0, 0))
return;
}
return _sigpause_common(set);
}
static inline int
@@ -1067,13 +996,13 @@ static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
* 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,
unsigned long orig_i0, int restart_syscall)
asmlinkage void do_signal(struct pt_regs * regs, unsigned long orig_i0, int restart_syscall)
{
siginfo_t info;
struct sparc_deliver_cookie cookie;
struct k_sigaction ka;
int signr;
sigset_t *oldset;
/*
* XXX Disable svr4 signal handling until solaris emulation works.
@@ -1089,7 +1018,9 @@ asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
cookie.restart_syscall = restart_syscall;
cookie.orig_i0 = orig_i0;
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, &cookie);
@@ -1098,7 +1029,14 @@ asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
syscall_restart(cookie.orig_i0, regs, &ka.sa);
handle_signal(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 ||
@@ -1115,7 +1053,14 @@ asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
regs->pc -= 4;
regs->npc -= 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);
}
}
asmlinkage int