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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/x86/kernel/entry_32.S
parentf34bfb1beef8a17ba3d46b60f8fa19ffedc1ed8d (diff)
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/x86/kernel/entry_32.S')
-rw-r--r--arch/x86/kernel/entry_32.S4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index 04ea83ccb97..95e6bbe3665 100644
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -51,6 +51,7 @@
#include <asm/percpu.h>
#include <asm/dwarf2.h>
#include <asm/processor-flags.h>
+#include <asm/ftrace.h>
#include "irq_vectors.h"
/*
@@ -1118,6 +1119,7 @@ ENTRY(mcount)
pushl %ecx
pushl %edx
movl 0xc(%esp), %eax
+ subl $MCOUNT_INSN_SIZE, %eax
.globl mcount_call
mcount_call:
@@ -1136,6 +1138,7 @@ ENTRY(ftrace_caller)
pushl %edx
movl 0xc(%esp), %eax
movl 0x4(%ebp), %edx
+ subl $MCOUNT_INSN_SIZE, %eax
.globl ftrace_call
ftrace_call:
@@ -1166,6 +1169,7 @@ trace:
pushl %edx
movl 0xc(%esp), %eax
movl 0x4(%ebp), %edx
+ subl $MCOUNT_INSN_SIZE, %eax
call *ftrace_trace_function