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authorCyrill Gorcunov <gorcunov@gmail.com>2008-12-13 00:09:08 +0300
committerIngo Molnar <mingo@elte.hu>2008-12-17 00:26:38 +0100
commitd680fe44775ed17a80035462d9898f5e77bfd7dd (patch)
treedddee638e2a44d5008684c6a59b44edcae98ba8f /arch/x86/include/asm/ftrace.h
parent66896a85cf2890b6bbbc4c9ccdcd296600ffbf89 (diff)
x86: entry_64 - introduce FTRACE_ frame macro v2
Impact: clean up Itroduce MCOUNT_SAVE/RESTORE_FRAME which allow us to save a number of lines on source level. Also fix a comment in ftrace.h. Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/include/asm/ftrace.h')
-rw-r--r--arch/x86/include/asm/ftrace.h29
1 files changed, 28 insertions, 1 deletions
diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h
index 7e61b4ceb9a..b55b4a7fbef 100644
--- a/arch/x86/include/asm/ftrace.h
+++ b/arch/x86/include/asm/ftrace.h
@@ -1,6 +1,33 @@
#ifndef _ASM_X86_FTRACE_H
#define _ASM_X86_FTRACE_H
+#ifdef __ASSEMBLY__
+
+ .macro MCOUNT_SAVE_FRAME
+ /* taken from glibc */
+ subq $0x38, %rsp
+ movq %rax, (%rsp)
+ movq %rcx, 8(%rsp)
+ movq %rdx, 16(%rsp)
+ movq %rsi, 24(%rsp)
+ movq %rdi, 32(%rsp)
+ movq %r8, 40(%rsp)
+ movq %r9, 48(%rsp)
+ .endm
+
+ .macro MCOUNT_RESTORE_FRAME
+ movq 48(%rsp), %r9
+ movq 40(%rsp), %r8
+ movq 32(%rsp), %rdi
+ movq 24(%rsp), %rsi
+ movq 16(%rsp), %rdx
+ movq 8(%rsp), %rcx
+ movq (%rsp), %rax
+ addq $0x38, %rsp
+ .endm
+
+#endif
+
#ifdef CONFIG_FUNCTION_TRACER
#define MCOUNT_ADDR ((long)(mcount))
#define MCOUNT_INSN_SIZE 5 /* sizeof mcount call */
@@ -46,7 +73,7 @@ struct ftrace_ret_stack {
/*
* Primary handler of a function return.
* It relays on ftrace_return_to_handler.
- * Defined in entry32.S
+ * Defined in entry_32/64.S
*/
extern void return_to_handler(void);