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authorDavid Howells <dhowells@redhat.com>2006-01-19 02:43:59 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-19 04:20:29 +0100
commita411aee96ea7fe6fe065df65bf29ea755bcdb554 (patch)
tree3a6cfece835c6d896a035e05fbcfe34a4c691bfc /arch/frv/kernel/signal.c
parent[PATCH] Generic sys_rt_sigsuspend() (diff)
downloadlinux-a411aee96ea7fe6fe065df65bf29ea755bcdb554.tar.xz
linux-a411aee96ea7fe6fe065df65bf29ea755bcdb554.zip
[PATCH] Handle TIF_RESTORE_SIGMASK for FRV
Handle TIF_RESTORE_SIGMASK as added by David Woodhouse's patch entitled: [PATCH] 2/3 Add TIF_RESTORE_SIGMASK support for arch/powerpc [PATCH] 3/3 Generic sys_rt_sigsuspend It does the following: (1) Declares TIF_RESTORE_SIGMASK for FRV. (2) Invokes it over to do_signal() when TIF_RESTORE_SIGMASK is set. (3) Makes do_signal() support TIF_RESTORE_SIGMASK, using the signal mask saved in current->saved_sigmask. (4) Discards sys_rt_sigsuspend() from the arch, using the generic one instead. (5) Makes sys_sigsuspend() save the signal mask and set TIF_RESTORE_SIGMASK rather than attempting to fudge the return registers. (6) Makes sys_sigsuspend() return -ERESTARTNOHAND rather than looping intrinsically. (7) Makes setup_frame(), setup_rt_frame() and handle_signal() return 0 or -EFAULT rather than true/false to be consistent with the rest of the kernel. Due to the fact do_signal() is then only called from one place: (8) Make do_signal() no longer have a return value is it was just being ignored; force_sig() takes care of this. (9) Discards the old sigmask argument to do_signal() as it's no longer necessary. This patch depends on the FRV signalling patches as well as the sys_rt_sigsuspend patch. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/frv/kernel/signal.c')
-rw-r--r--arch/frv/kernel/signal.c120
1 files changed, 44 insertions, 76 deletions
diff --git a/arch/frv/kernel/signal.c b/arch/frv/kernel/signal.c
index 5b7146f54fd5..679c1d5cc958 100644
--- a/arch/frv/kernel/signal.c
+++ b/arch/frv/kernel/signal.c
@@ -35,74 +35,22 @@ struct fdpic_func_descriptor {
unsigned long GOT;
};
-static int do_signal(sigset_t *oldset);
-
/*
* Atomically swap in the new signal mask, and wait for a signal.
*/
asmlinkage int sys_sigsuspend(int history0, int history1, old_sigset_t mask)
{
- 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);
- __frame->gr8 = -EINTR;
- while (1) {
- current->state = TASK_INTERRUPTIBLE;
- schedule();
- if (do_signal(&saveset))
- /* return the signal number as the return value of this function
- * - this is an utterly evil hack. syscalls should not invoke do_signal()
- * as entry.S sets regs->gr8 to the return value of the system call
- * - we can't just use sigpending() as we'd have to discard SIG_IGN signals
- * and call waitpid() if SIGCHLD needed discarding
- * - this only works on the i386 because it passes arguments to the signal
- * handler on the stack, and the return value in EAX is effectively
- * discarded
- */
- return __frame->gr8;
- }
-}
-
-asmlinkage int sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize)
-{
- 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);
-
- __frame->gr8 = -EINTR;
- while (1) {
- current->state = TASK_INTERRUPTIBLE;
- schedule();
- if (do_signal(&saveset))
- /* return the signal number as the return value of this function
- * - this is an utterly evil hack. syscalls should not invoke do_signal()
- * as entry.S sets regs->gr8 to the return value of the system call
- * - we can't just use sigpending() as we'd have to discard SIG_IGN signals
- * and call waitpid() if SIGCHLD needed discarding
- * - this only works on the i386 because it passes arguments to the signal
- * handler on the stack, and the return value in EAX is effectively
- * discarded
- */
- return __frame->gr8;
- }
+ current->state = TASK_INTERRUPTIBLE;
+ schedule();
+ set_thread_flag(TIF_RESTORE_SIGMASK);
+ return -ERESTARTNOHAND;
}
asmlinkage int sys_sigaction(int sig,
@@ -372,11 +320,11 @@ static int setup_frame(int sig, struct k_sigaction *ka, sigset_t *set)
frame->pretcode);
#endif
- return 1;
+ return 0;
give_sigsegv:
force_sig(SIGSEGV, current);
- return 0;
+ return -EFAULT;
} /* end setup_frame() */
@@ -471,11 +419,11 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
frame->pretcode);
#endif
- return 1;
+ return 0;
give_sigsegv:
force_sig(SIGSEGV, current);
- return 0;
+ return -EFAULT;
} /* end setup_rt_frame() */
@@ -516,7 +464,7 @@ static int handle_signal(unsigned long sig, siginfo_t *info,
else
ret = setup_frame(sig, ka, oldset);
- if (ret) {
+ if (ret == 0) {
spin_lock_irq(&current->sighand->siglock);
sigorsets(&current->blocked, &current->blocked,
&ka->sa.sa_mask);
@@ -536,10 +484,11 @@ static int handle_signal(unsigned long sig, siginfo_t *info,
* want to handle. Thus you cannot kill init even with a SIGKILL even by
* mistake.
*/
-static int do_signal(sigset_t *oldset)
+static void do_signal(void)
{
struct k_sigaction ka;
siginfo_t info;
+ sigset_t *oldset;
int signr;
/*
@@ -549,43 +498,62 @@ static int do_signal(sigset_t *oldset)
* if so.
*/
if (!user_mode(__frame))
- return 1;
+ return;
if (try_to_freeze())
goto no_signal;
- if (!oldset)
+ if (test_thread_flag(TIF_RESTORE_SIGMASK))
+ oldset = &current->saved_sigmask;
+ else
oldset = &current->blocked;
signr = get_signal_to_deliver(&info, &ka, __frame, NULL);
- if (signr > 0)
- return handle_signal(signr, &info, &ka, oldset);
+ if (signr > 0) {
+ if (handle_signal(signr, &info, &ka, oldset) == 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;
+ }
no_signal:
/* Did we come from a system call? */
if (__frame->syscallno >= 0) {
/* Restart the system call - no handlers present */
- if (__frame->gr8 == -ERESTARTNOHAND ||
- __frame->gr8 == -ERESTARTSYS ||
- __frame->gr8 == -ERESTARTNOINTR) {
+ switch (__frame->gr8) {
+ case -ERESTARTNOHAND:
+ case -ERESTARTSYS:
+ case -ERESTARTNOINTR:
__frame->gr8 = __frame->orig_gr8;
__frame->pc -= 4;
- }
+ break;
- if (__frame->gr8 == -ERESTART_RESTARTBLOCK){
+ case -ERESTART_RESTARTBLOCK:
__frame->gr8 = __NR_restart_syscall;
__frame->pc -= 4;
+ break;
}
}
- 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);
+ }
} /* end do_signal() */
/*****************************************************************************/
/*
* notification of userspace execution resumption
- * - triggered by current->work.notify_resume
+ * - triggered by the TIF_WORK_MASK flags
*/
asmlinkage void do_notify_resume(__u32 thread_info_flags)
{
@@ -594,7 +562,7 @@ asmlinkage void do_notify_resume(__u32 thread_info_flags)
clear_thread_flag(TIF_SINGLESTEP);
/* deal with pending signal delivery */
- if (thread_info_flags & _TIF_SIGPENDING)
- do_signal(NULL);
+ if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
+ do_signal();
} /* end do_notify_resume() */