derek.holloway
7502bf64a4
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101 lines
2.9 KiB
ArmAsm
101 lines
2.9 KiB
ArmAsm
//===-- aeabi_uread8.S - ARM EABI Helper — Unaligned 8-Byte Memory Read----===//
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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_uread8 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_uread8)
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#if defined(__thumb__) && !defined(__thumb2__)
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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ldrb r1, [r0]
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ldrb r2, [r0, #1]
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lsls r2, r2, #8
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adds r1, r2, r1
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ldrb r2, [r0, #2]
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lsls r2, r2, #16
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ldrb r3, [r0, #3]
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lsls r3, r3, #24
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adds r2, r3, r2
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adds r2, r2, r1
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ldrb r1, [r0, #4]
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ldrb r3, [r0, #5]
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lsls r3, r3, #8
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adds r1, r3, r1
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ldrb r3, [r0, #6]
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lsls r3, r3, #16
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ldrb r0, [r0, #7]
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lsls r0, r0, #24
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adds r0, r0, r3
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adds r1, r0, r1
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#else
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ldrb r1, [r0, #3]
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ldrb r2, [r0, #2]
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lsls r2, r2, #8
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adds r1, r2, r1
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ldrb r2, [r0, #1]
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lsls r2, r2, #16
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ldrb r3, [r0]
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lsls r3, r3, #24
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adds r2, r3, r2
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adds r2, r2, r1
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ldrb r1, [r0, #7]
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ldrb r3, [r0, #6]
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lsls r3, r3, #8
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adds r1, r3, r1
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ldrb r3, [r0, #5]
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lsls r3, r3, #16
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ldrb r0, [r0, #4]
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lsls r0, r0, #24
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adds r0, r0, r3
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adds r1, r0, r1
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#endif
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mov r0, r2
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bx lr
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#else
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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ldrb r12, [r0]
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ldrb r2, [r0, #1]
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ldrb r3, [r0, #2]
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ldrb r1, [r0, #3]
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orr r1, r3, r1, lsl #8
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orr r2, r12, r2, lsl #8
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orr r2, r2, r1, lsl #16
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ldrb r1, [r0, #5]
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ldrb r3, [r0, #4]!
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orr r1, r3, r1, lsl #8
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ldrb r3, [r0, #2]
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ldrb r0, [r0, #3]
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orr r0, r3, r0, lsl #8
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orr r1, r1, r0, lsl #16
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#else
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ldrb r12, [r0]
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ldrb r2, [r0, #1]
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ldrb r3, [r0, #2]
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ldrb r1, [r0, #3]
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orr r2, r2, r12, lsl #8
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orr r1, r1, r3, lsl #8
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orr r2, r1, r2, lsl #16
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mov r1, r0
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ldrb r0, [r0, #5]
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ldrb r3, [r1, #4]!
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orr r0, r0, r3, lsl #8
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ldrb r3, [r1, #2]
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ldrb r1, [r1, #3]
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orr r1, r1, r3, lsl #8
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orr r1, r1, r0, lsl #16
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#endif
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mov r0, r2
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bx lr
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#endif
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END_COMPILERRT_FUNCTION(__aeabi_uread8)
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