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authorLin Yongting <linyongting@gmail.com>2014-11-16 03:14:58 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2014-11-21 15:24:49 +0000
commitc2459d35f5b8de077fde859b8c96a23f309b9ab2 (patch)
tree7ee1b10de74cc045af8eea51d676a473ac59db7b /arch/arm/lib
parenta391263cd84e6ae2da26a54383f3abf80c18d9df (diff)
downloadlinux-linaro-stable-c2459d35f5b8de077fde859b8c96a23f309b9ab2.tar.gz
ARM: 8204/1: Add unwinding support for memset function
The memset function never had unwinding annotations added. Currently, when accessing NULL pointer by memset occurs the backtrace shown will stop at memset or some completely unrelated function. Add unwinding annotations in hopes of getting a more useful backtrace when accessing NULL pointer by memset, kprobe or interrupt. Signed-off-by: Lin Yongting <linyongting@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/lib')
-rw-r--r--arch/arm/lib/memset.S12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/arm/lib/memset.S b/arch/arm/lib/memset.S
index 671455c854fa..a4ee97b5a2bf 100644
--- a/arch/arm/lib/memset.S
+++ b/arch/arm/lib/memset.S
@@ -11,11 +11,13 @@
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
+#include <asm/unwind.h>
.text
.align 5
ENTRY(memset)
+UNWIND( .fnstart )
ands r3, r0, #3 @ 1 unaligned?
mov ip, r0 @ preserve r0 as return value
bne 6f @ 1
@@ -34,6 +36,9 @@ ENTRY(memset)
* We need 2 extra registers for this loop - use r8 and the LR
*/
stmfd sp!, {r8, lr}
+UNWIND( .fnend )
+UNWIND( .fnstart )
+UNWIND( .save {r8, lr} )
mov r8, r1
mov lr, r1
@@ -53,6 +58,7 @@ ENTRY(memset)
tst r2, #16
stmneia ip!, {r1, r3, r8, lr}
ldmfd sp!, {r8, lr}
+UNWIND( .fnend )
#else
@@ -62,6 +68,9 @@ ENTRY(memset)
*/
stmfd sp!, {r4-r8, lr}
+UNWIND( .fnend )
+UNWIND( .fnstart )
+UNWIND( .save {r4-r8, lr} )
mov r4, r1
mov r5, r1
mov r6, r1
@@ -94,9 +103,11 @@ ENTRY(memset)
tst r2, #16
stmneia ip!, {r4-r7}
ldmfd sp!, {r4-r8, lr}
+UNWIND( .fnend )
#endif
+UNWIND( .fnstart )
4: tst r2, #8
stmneia ip!, {r1, r3}
tst r2, #4
@@ -120,4 +131,5 @@ ENTRY(memset)
strb r1, [ip], #1 @ 1
add r2, r2, r3 @ 1 (r2 = r2 - (4 - r3))
b 1b
+UNWIND( .fnend )
ENDPROC(memset)