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