From 6558ba2b5cc3a2f22039db30616fcd07c1b28ac8 Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@redhat.com>
Date: Sun, 27 Jul 2008 16:49:50 +1000
Subject: powerpc: Call tracehook_signal_handler() when setting up signal
 frames

This makes the powerpc signal handling code call tracehook_signal_handler()
after a handler is set up.  This means that using PTRACE_SINGLESTEP to
enter a signal handler will report to ptrace on the first instruction of
the handler, instead of the second.  This is consistent with what x86 and
other machines do, and what users and debuggers want.

BenH: Fixed up the test for the trap value.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/kernel/signal.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c
index 2b5eaa6c8f3..e74aa0ed4e9 100644
--- a/arch/powerpc/kernel/signal.c
+++ b/arch/powerpc/kernel/signal.c
@@ -9,7 +9,7 @@
  * this archive for more details.
  */
 
-#include <linux/ptrace.h>
+#include <linux/tracehook.h>
 #include <linux/signal.h>
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
@@ -177,6 +177,12 @@ int do_signal(sigset_t *oldset, struct pt_regs *regs)
 		 * its frame, and we can clear the TLF_RESTORE_SIGMASK flag.
 		 */
 		current_thread_info()->local_flags &= ~_TLF_RESTORE_SIGMASK;
+
+		/*
+		 * Let tracing know that we've done the handler setup.
+		 */
+		tracehook_signal_handler(signr, &info, &ka, regs,
+					 test_thread_flag(TIF_SINGLESTEP));
 	}
 
 	return ret;
-- 
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