/* | |
* 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/asmmacro.h> | |
#include <asm/ftrace.h> | |
/* | |
* Entry condition: | |
* | |
* a2: a0 of the caller | |
*/ | |
ENTRY(_mcount) | |
abi_entry_default | |
movi a4, ftrace_trace_function | |
l32i a4, a4, 0 | |
movi a3, ftrace_stub | |
bne a3, a4, 1f | |
abi_ret_default | |
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 | |
abi_ret_default | |
ENDPROC(_mcount) | |
ENTRY(ftrace_stub) | |
abi_entry_default | |
abi_ret_default | |
ENDPROC(ftrace_stub) |