/* * 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 in windowed ABI *   a10:	a0 of the caller in call0 ABI * * In call0 ABI the function _mcount is called with the special ABI: * its argument is in a10 and all the usual argument registers (a2 - a7) * must be preserved in addition to callee-saved a12 - a15. */ ENTRY(_mcount)#if defined(__XTENSA_WINDOWED_ABI__)	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#elif defined(__XTENSA_CALL0_ABI__)	abi_entry_default 	movi	a9, ftrace_trace_function	l32i	a9, a9, 0	movi	a11, ftrace_stub	bne	a9, a11, 1f	abi_ret_default 1:	abi_entry(28)	s32i	a0, sp, 0	s32i	a2, sp, 4	s32i	a3, sp, 8	s32i	a4, sp, 12	s32i	a5, sp, 16	s32i	a6, sp, 20	s32i	a7, sp, 24	addi	a2, a10, -MCOUNT_INSN_SIZE	callx0	a9	l32i	a0, sp, 0	l32i	a2, sp, 4	l32i	a3, sp, 8	l32i	a4, sp, 12	l32i	a5, sp, 16	l32i	a6, sp, 20	l32i	a7, sp, 24	abi_ret(28)#else#error Unsupported Xtensa ABI#endifENDPROC(_mcount)EXPORT_SYMBOL(_mcount) ENTRY(ftrace_stub)	abi_entry_default	abi_ret_defaultENDPROC(ftrace_stub)