| /* | |
| * 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) |