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/*
* 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)
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