1/* 2 * arch/xtensa/kernel/mcount.S 3 * 4 * Xtensa specific mcount support 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file "COPYING" in the main directory of this archive 8 * for more details. 9 * 10 * Copyright (C) 2013 Tensilica Inc. 11 */ 12 13#include <linux/linkage.h> 14#include <asm/ftrace.h> 15 16/* 17 * Entry condition: 18 * 19 * a2: a0 of the caller 20 */ 21 22ENTRY(_mcount) 23 24 entry a1, 16 25 26 movi a4, ftrace_trace_function 27 l32i a4, a4, 0 28 movi a3, ftrace_stub 29 bne a3, a4, 1f 30 retw 31 321: xor a7, a2, a1 33 movi a3, 0x3fffffff 34 and a7, a7, a3 35 xor a7, a7, a1 36 37 xor a6, a0, a1 38 and a6, a6, a3 39 xor a6, a6, a1 40 addi a6, a6, -MCOUNT_INSN_SIZE 41 callx4 a4 42 43 retw 44 45ENDPROC(_mcount) 46 47ENTRY(ftrace_stub) 48 entry a1, 16 49 retw 50ENDPROC(ftrace_stub) 51