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Commit d680fe44 authored by Cyrill Gorcunov's avatar Cyrill Gorcunov Committed by Ingo Molnar
Browse files

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: default avatarIngo Molnar <mingo@elte.hu>
parent 66896a85

arch/x86/include/asm/ftrace.h

+28 −1
Original line number Diff line number Diff line 
#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);

arch/x86/kernel/entry_64.S

+7 −50
Original line number Diff line number Diff line
@@ -71,15 +71,7 @@ ENTRY(ftrace_caller) 
	cmpl $0, function_trace_stop

	jne  ftrace_stub



	/* 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)

	MCOUNT_SAVE_FRAME



	movq 0x38(%rsp), %rdi

	movq 8(%rbp), %rsi
@@ -89,14 +81,7 @@ ENTRY(ftrace_caller) 
ftrace_call:

	call ftrace_stub



	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

	MCOUNT_RESTORE_FRAME



#ifdef CONFIG_FUNCTION_GRAPH_TRACER

.globl ftrace_graph_call
@@ -130,15 +115,7 @@ ftrace_stub: 
	retq



trace:

	/* 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)

	MCOUNT_SAVE_FRAME



	movq 0x38(%rsp), %rdi

	movq 8(%rbp), %rsi
@@ -146,14 +123,7 @@ trace: 


	call   *ftrace_trace_function



	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

	MCOUNT_RESTORE_FRAME



	jmp ftrace_stub

END(mcount)
@@ -165,14 +135,7 @@ ENTRY(ftrace_graph_caller) 
	cmpl $0, function_trace_stop

	jne ftrace_stub



	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)

	MCOUNT_SAVE_FRAME



	leaq 8(%rbp), %rdi

	movq 0x38(%rsp), %rsi
@@ -180,14 +143,8 @@ ENTRY(ftrace_graph_caller) 


	call	prepare_ftrace_return



	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

	MCOUNT_RESTORE_FRAME



	retq

END(ftrace_graph_caller)