mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-20 10:44:23 +08:00
478ba61afc
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
51 lines
775 B
ArmAsm
51 lines
775 B
ArmAsm
/*
|
|
* arch/xtensa/kernel/mcount.S
|
|
*
|
|
* Xtensa specific mcount support
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2013 Tensilica Inc.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/ftrace.h>
|
|
|
|
/*
|
|
* Entry condition:
|
|
*
|
|
* a2: a0 of the caller
|
|
*/
|
|
|
|
ENTRY(_mcount)
|
|
|
|
entry a1, 16
|
|
|
|
movi a4, ftrace_trace_function
|
|
l32i a4, a4, 0
|
|
movi a3, ftrace_stub
|
|
bne a3, a4, 1f
|
|
retw
|
|
|
|
1: xor a7, a2, a1
|
|
movi a3, 0x3fffffff
|
|
and a7, a7, a3
|
|
xor a7, a7, a1
|
|
|
|
xor a6, a0, a1
|
|
and a6, a6, a3
|
|
xor a6, a6, a1
|
|
addi a6, a6, -MCOUNT_INSN_SIZE
|
|
callx4 a4
|
|
|
|
retw
|
|
|
|
ENDPROC(_mcount)
|
|
|
|
ENTRY(ftrace_stub)
|
|
entry a1, 16
|
|
retw
|
|
ENDPROC(ftrace_stub)
|