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| author | Abhishek Sagar <sagar.abhishek@gmail.com> | 2008-06-21 23:47:27 +0530 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-06-23 22:10:56 +0200 |
| commit | 395a59d0f8e86bb39cd700c3d185d30c670bb958 (patch) | |
| tree | 1558e635efcede901c5dbe9acd625d475db5b369 /arch/x86/kernel/entry_32.S | |
| parent | f34bfb1beef8a17ba3d46b60f8fa19ffedc1ed8d (diff) | |
| download | lwn-395a59d0f8e86bb39cd700c3d185d30c670bb958.tar.gz lwn-395a59d0f8e86bb39cd700c3d185d30c670bb958.zip | |
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.S | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S index 04ea83ccb979..95e6bbe3665e 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 |