derek.holloway
7502bf64a4
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36 lines
1.2 KiB
ArmAsm
36 lines
1.2 KiB
ArmAsm
//===-- aeabi_uwrite4.S - ARM EABI Helper — Unaligned 4-Byte Memory Write--===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// Implements __aeabi_uwrite4 for unaligned memory accesses.
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// Reference: Arm RTABI32 Specification.
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// https://github.com/ARM-software/abi-aa/blob/main/rtabi32/rtabi32.rst#unaligned-memory-access
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//===-------------------------------------------------------------------------------------===//
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#include "../assembly.h"
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.syntax unified
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.p2align 2
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DEFINE_COMPILERRT_FUNCTION(__aeabi_uwrite4)
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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lsrs r2, r0, #24
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strb r0, [r1]
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strb r2, [r1, #3]
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lsrs r2, r0, #16
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strb r2, [r1, #2]
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lsrs r2, r0, #8
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strb r2, [r1, #1]
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#else
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lsrs r2, r0, #8
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strb r0, [r1, #3]
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strb r2, [r1, #2]
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lsrs r2, r0, #16
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strb r2, [r1, #1]
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lsrs r2, r0, #24
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strb r2, [r1]
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#endif
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bx lr
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END_COMPILERRT_FUNCTION(__aeabi_uwrite4)
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