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authorAbhishek Sagar <sagar.abhishek@gmail.com>2008-06-21 23:47:27 +0530
committerIngo Molnar <mingo@elte.hu>2008-06-23 22:10:56 +0200
commit395a59d0f8e86bb39cd700c3d185d30c670bb958 (patch)
tree1558e635efcede901c5dbe9acd625d475db5b369 /arch/arm/kernel/entry-common.S
parentf34bfb1beef8a17ba3d46b60f8fa19ffedc1ed8d (diff)
downloadop-kernel-dev-395a59d0f8e86bb39cd700c3d185d30c670bb958.zip
op-kernel-dev-395a59d0f8e86bb39cd700c3d185d30c670bb958.tar.gz
ftrace: store mcount address in rec->ip
Record the address of the mcount call-site. Currently all archs except sparc64 record the address of the instruction following the mcount call-site. Some general cleanups are entailed. Storing mcount addresses in rec->ip enables looking them up in the kprobe hash table later on to check if they're kprobe'd. Signed-off-by: Abhishek Sagar <sagar.abhishek@gmail.com> Cc: davem@davemloft.net Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/arm/kernel/entry-common.S')
-rw-r--r--arch/arm/kernel/entry-common.S4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 8f79a47..84694e8 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -9,6 +9,7 @@
*/
#include <asm/unistd.h>
+#include <asm/ftrace.h>
#include <asm/arch/entry-macro.S>
#include "entry-header.S"
@@ -104,6 +105,7 @@ ENTRY(ret_from_fork)
ENTRY(mcount)
stmdb sp!, {r0-r3, lr}
mov r0, lr
+ sub r0, r0, #MCOUNT_INSN_SIZE
.globl mcount_call
mcount_call:
@@ -114,6 +116,7 @@ ENTRY(ftrace_caller)
stmdb sp!, {r0-r3, lr}
ldr r1, [fp, #-4]
mov r0, lr
+ sub r0, r0, #MCOUNT_INSN_SIZE
.globl ftrace_call
ftrace_call:
@@ -134,6 +137,7 @@ ENTRY(mcount)
trace:
ldr r1, [fp, #-4]
mov r0, lr
+ sub r0, r0, #MCOUNT_INSN_SIZE
mov lr, pc
mov pc, r2
ldmia sp!, {r0-r3, pc}
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