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/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Thumb mode toolchain helpers for compact switch/case statement.
*/
#include "config.h"
.text
.syntax unified
.code 16
/*
* Helpers for compact switch
*
* r0: the table index
* lr: the table base address (need to clear bit 0)
*
* r0 and lr must be PRESERVED.
* r12 can be clobbered.
*/
.global __gnu_thumb1_case_uqi
.thumb_func
__gnu_thumb1_case_uqi:
mov r12, r1
mov r1, lr
lsrs r1, r1, #1
lsls r1, r1, #1
ldrb r1, [r1, r0]
lsls r1, r1, #1
add lr, lr, r1
mov r1, r12
bx lr
.global __gnu_thumb1_case_sqi
.thumb_func
__gnu_thumb1_case_sqi:
mov r12, r1
mov r1, lr
lsrs r1, r1, #1
lsls r1, r1, #1
ldrsb r1, [r1, r0]
lsls r1, r1, #1
add lr, lr, r1
mov r1, r12
bx lr
.global __gnu_thumb1_case_uhi
.thumb_func
__gnu_thumb1_case_uhi:
push {r0, r1}
mov r1, lr
lsrs r1, r1, #1
lsls r0, r0, #1
lsls r1, r1, #1
ldrh r1, [r1, r0]
lsls r1, r1, #1
add lr, lr, r1
pop {r0, r1}
bx lr
.global __gnu_thumb1_case_shi
.thumb_func
__gnu_thumb1_case_shi:
push {r0, r1}
mov r1, lr
lsrs r1, r1, #1
lsls r0, r0, #1
lsls r1, r1, #1
ldrsh r1, [r1, r0]
lsls r1, r1, #1
add lr, lr, r1
pop {r0, r1}
bx lr
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