From 71664fd8d2d2550a56cc6a9c2b81797bfe90d613 Mon Sep 17 00:00:00 2001
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Mon, 17 Nov 2014 18:22:04 +1100
Subject: Stack checking extensions

This patch adds:

 - Normal builds are done with -fstack-protector (we want to investigate
using -fstack-protector-strong on gcc4.9 but for now we just use that

 - Build with STACK_CHECK=1 will use -fstack-protector-all and -pg and
will check the stack in mcount

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 asm/misc.S | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'asm/misc.S')

diff --git a/asm/misc.S b/asm/misc.S
index ccb30d1..00c7f78 100644
--- a/asm/misc.S
+++ b/asm/misc.S
@@ -17,6 +17,7 @@
 #include <asm-utils.h>
 #include <asm-offsets.h>
 #include <processor.h>
+#include <stack.h>
 
 	.section ".text","ax"
 	.balign	0x10
@@ -41,3 +42,11 @@ trigger_attn:
 	isync
 	attn
 	blr
+
+#ifdef STACK_CHECK_ENABLED
+.global _mcount
+_mcount:
+	mr	%r3,%r1
+	mflr	%r4
+	b	__mcount_stack_check
+#endif
-- 
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