| /* |
| * 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) |
