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2dc7016541
Add other helpers for compact switch on ARMv6-M. Signed-off-by: Vincent Palatin <vpalatin@chromium.org> BRANCH=none BUG=none TEST=none Change-Id: I711ee8361ff1545acd978974d9f9fc306ca43b78 Reviewed-on: https://chromium-review.googlesource.com/190711 Tested-by: Vincent Palatin <vpalatin@chromium.org> Reviewed-by: Randall Spangler <rspangler@chromium.org> Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
78 lines
1.4 KiB
ArmAsm
78 lines
1.4 KiB
ArmAsm
/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Thumb mode toolchain helpers for compact switch/case statement.
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*/
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#include "config.h"
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.text
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.syntax unified
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.code 16
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/*
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* Helpers for compact switch
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*
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* r0: the table index
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* lr: the table base address (need to clear bit 0)
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*
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* r0 and lr must be PRESERVED.
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* r12 can be clobbered.
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*/
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.global __gnu_thumb1_case_uqi
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.thumb_func
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__gnu_thumb1_case_uqi:
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mov r12, r1
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mov r1, lr
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lsrs r1, r1, #1
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lsls r1, r1, #1
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ldrb r1, [r1, r0]
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lsls r1, r1, #1
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add lr, lr, r1
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mov r1, r12
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bx lr
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.global __gnu_thumb1_case_sqi
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.thumb_func
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__gnu_thumb1_case_sqi:
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mov r12, r1
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mov r1, lr
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lsrs r1, r1, #1
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lsls r1, r1, #1
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ldrsb r1, [r1, r0]
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lsls r1, r1, #1
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add lr, lr, r1
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mov r1, r12
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bx lr
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.global __gnu_thumb1_case_uhi
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.thumb_func
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__gnu_thumb1_case_uhi:
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push {r0, r1}
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mov r1, lr
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lsrs r1, r1, #1
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lsls r0, r0, #1
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lsls r1, r1, #1
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ldrh r1, [r1, r0]
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lsls r1, r1, #1
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add lr, lr, r1
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pop {r0, r1}
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bx lr
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.global __gnu_thumb1_case_shi
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.thumb_func
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__gnu_thumb1_case_shi:
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push {r0, r1}
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mov r1, lr
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lsrs r1, r1, #1
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lsls r0, r0, #1
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lsls r1, r1, #1
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ldrsh r1, [r1, r0]
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lsls r1, r1, #1
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add lr, lr, r1
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pop {r0, r1}
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bx lr
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