[mirror_edk2.git] / ArmPkg / Library / CompilerIntrinsicsLib / Arm / switchu8.S

#/** @file\r
#  Compiler intrinsic for ARM compiler\r
#\r
#  Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r
#  This program and the accompanying materials\r
#  are licensed and made available under the terms and conditions of the BSD License\r
#  which accompanies this distribution.  The full text of the license may be found at\r
#  http)://opensource.org/licenses/bsd-license.php\r
#\r
#  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
#  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.;\r
#\r
#**/\r
#        \r
\r
.text\r
.p2align 2\r
\r
GCC_ASM_EXPORT(__switchu8)\r
\r
\r
ASM_PFX(__switchu8):\r
    ldrb      ip,[lr,#-1]\r
    cmp       r0,ip\r
    ldrccb    r0,[lr,r0]\r
    ldrcsb    r0,[lr,ip]\r
    add       ip,lr,r0,LSL #1\r
    bx        ip\r
\r
Commit	Line	Data
1e57a462	1	#/** @file\r
	2	# Compiler intrinsic for ARM compiler\r
	3	#\r
	4	# Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r
	5	# This program and the accompanying materials\r
	6	# are licensed and made available under the terms and conditions of the BSD License\r
	7	# which accompanies this distribution. The full text of the license may be found at\r
	8	# http)://opensource.org/licenses/bsd-license.php\r
	9	#\r
	10	# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	11	# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.;\r
	12	#\r
	13	#**/\r
	14	# \r
	15	\r
	16	.text\r
	17	.p2align 2\r
	18	\r
	19	GCC_ASM_EXPORT(__switchu8)\r
	20	\r
	21	\r
	22	ASM_PFX(__switchu8):\r
	23	ldrb ip,[lr,#-1]\r
	24	cmp r0,ip\r
	25	ldrccb r0,[lr,r0]\r
	26	ldrcsb r0,[lr,ip]\r
	27	add ip,lr,r0,LSL #1\r
	28	bx ip\r
	29	\r