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authorDavid Howells <dhowells@redhat.com>2006-01-06 11:11:44 +0300
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 19:33:33 +0300
commit8efc0ab50edbac5c65191b8a58dfdab3741b7901 (patch)
tree3598a874f715e89d475a9bc8a435a1096f19c58d /arch/frv
parent7ee1dd3fee22f15728f545d266403fc977e1eb99 (diff)
downloadlinux-8efc0ab50edbac5c65191b8a58dfdab3741b7901.tar.xz
[PATCH] frv: fix signal handling
The attached patch makes FRV signal handling work properly: (1) After do_notify_resume() has been called, the work flags must be checked again (there may be another signal to deliver or the process might require rescheduling for instance). (2) After the signal frame is set up on the userspace stack, ptrace() should be given an opportunity to single-step into the signal handler. (3) The error state from setting up a signal frame should be passed back up the call chain. (4) The segfault handler shouldn't be preemptively reset in the arch if we fail to deliver a SEGV signal: force_sig() will take care of that. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/frv')
-rw-r--r--arch/frv/kernel/entry.S2
-rw-r--r--arch/frv/kernel/signal.c73
2 files changed, 46 insertions, 29 deletions
diff --git a/arch/frv/kernel/entry.S b/arch/frv/kernel/entry.S
index ad10ea595459..5f6548388b74 100644
--- a/arch/frv/kernel/entry.S
+++ b/arch/frv/kernel/entry.S
@@ -1076,7 +1076,7 @@ __entry_work_notifysig:
LEDS 0x6410
ori.p gr4,#0,gr8
call do_notify_resume
- bra __entry_return_direct
+ bra __entry_resume_userspace
# perform syscall entry tracing
__syscall_trace_entry:
diff --git a/arch/frv/kernel/signal.c b/arch/frv/kernel/signal.c
index d4ccc0728dfe..89a1cf5c076a 100644
--- a/arch/frv/kernel/signal.c
+++ b/arch/frv/kernel/signal.c
@@ -297,7 +297,8 @@ static inline void __user *get_sigframe(struct k_sigaction *ka,
/*
*
*/
-static void setup_frame(int sig, struct k_sigaction *ka, sigset_t *set, struct pt_regs * regs)
+static int setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
+ struct pt_regs *regs)
{
struct sigframe __user *frame;
int rsig;
@@ -362,26 +363,30 @@ static void setup_frame(int sig, struct k_sigaction *ka, sigset_t *set, struct p
set_fs(USER_DS);
+ /* the tracer may want to single-step inside the handler */
+ if (test_thread_flag(TIF_SINGLESTEP))
+ ptrace_notify(SIGTRAP);
+
#if DEBUG_SIG
printk("SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
- sig, current->comm, current->pid, frame, regs->pc, frame->pretcode);
+ sig, current->comm, current->pid, frame, regs->pc,
+ frame->pretcode);
#endif
- return;
+ return 1;
give_sigsegv:
- if (sig == SIGSEGV)
- ka->sa.sa_handler = SIG_DFL;
-
force_sig(SIGSEGV, current);
+ return 0;
+
} /* end setup_frame() */
/*****************************************************************************/
/*
*
*/
-static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
- sigset_t *set, struct pt_regs * regs)
+static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+ sigset_t *set, struct pt_regs * regs)
{
struct rt_sigframe __user *frame;
int rsig;
@@ -457,17 +462,21 @@ static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
set_fs(USER_DS);
+ /* the tracer may want to single-step inside the handler */
+ if (test_thread_flag(TIF_SINGLESTEP))
+ ptrace_notify(SIGTRAP);
+
#if DEBUG_SIG
printk("SIG deliver %d (%s:%d): sp=%p pc=%lx ra=%p\n",
- sig, current->comm, current->pid, frame, regs->pc, frame->pretcode);
+ sig, current->comm, current->pid, frame, regs->pc,
+ frame->pretcode);
#endif
- return;
+ return 1;
give_sigsegv:
- if (sig == SIGSEGV)
- ka->sa.sa_handler = SIG_DFL;
force_sig(SIGSEGV, current);
+ return 0;
} /* end setup_rt_frame() */
@@ -475,10 +484,12 @@ give_sigsegv:
/*
* OK, we're invoking a handler
*/
-static void handle_signal(unsigned long sig, siginfo_t *info,
- struct k_sigaction *ka, sigset_t *oldset,
- struct pt_regs *regs)
+static int handle_signal(unsigned long sig, siginfo_t *info,
+ struct k_sigaction *ka, sigset_t *oldset,
+ struct pt_regs *regs)
{
+ int ret;
+
/* Are we from a system call? */
if (in_syscall(regs)) {
/* If so, check system call restarting.. */
@@ -493,6 +504,7 @@ static void handle_signal(unsigned long sig, siginfo_t *info,
regs->gr8 = -EINTR;
break;
}
+
/* fallthrough */
case -ERESTARTNOINTR:
regs->gr8 = regs->orig_gr8;
@@ -502,16 +514,22 @@ static void handle_signal(unsigned long sig, siginfo_t *info,
/* Set up the stack frame */
if (ka->sa.sa_flags & SA_SIGINFO)
- setup_rt_frame(sig, ka, info, oldset, regs);
+ ret = setup_rt_frame(sig, ka, info, oldset, regs);
else
- setup_frame(sig, ka, oldset, regs);
+ ret = setup_frame(sig, ka, oldset, regs);
+
+ if (ret) {
+ 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;
- 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);
} /* end handle_signal() */
/*****************************************************************************/
@@ -542,12 +560,10 @@ int do_signal(struct pt_regs *regs, sigset_t *oldset)
oldset = &current->blocked;
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
- if (signr > 0) {
- handle_signal(signr, &info, &ka, oldset, regs);
- return 1;
- }
+ if (signr > 0)
+ return handle_signal(signr, &info, &ka, oldset, regs);
- no_signal:
+no_signal:
/* Did we come from a system call? */
if (regs->syscallno >= 0) {
/* Restart the system call - no handlers present */
@@ -565,6 +581,7 @@ int do_signal(struct pt_regs *regs, sigset_t *oldset)
}
return 0;
+
} /* end do_signal() */
/*****************************************************************************/