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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)
|
|
