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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2014-11-17 18:22:04 +1100
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2014-11-17 18:22:04 +1100
commit71664fd8d2d2550a56cc6a9c2b81797bfe90d613 (patch)
tree6f55e009ff6a8b00f9f1c7a905ad4075225dec93 /asm/misc.S
parent31d20fc02c8ee7c12d84bc28ce732bbc362ce369 (diff)
downloadtalos-skiboot-71664fd8d2d2550a56cc6a9c2b81797bfe90d613.tar.gz
talos-skiboot-71664fd8d2d2550a56cc6a9c2b81797bfe90d613.zip
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>
Diffstat (limited to 'asm/misc.S')
-rw-r--r--asm/misc.S9
1 files changed, 9 insertions, 0 deletions
diff --git a/asm/misc.S b/asm/misc.S
index ccb30d14..00c7f78e 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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