| /* SPDX-License-Identifier: GPL-2.0 */ |
| |
| #include <linux/linkage.h> |
| #include <asm/asm.h> |
| |
| ENTRY(__memmove) |
| WEAK(memmove) |
| move t0, a0 |
| move t1, a1 |
| |
| beq a0, a1, exit_memcpy |
| beqz a2, exit_memcpy |
| srli t2, a2, 0x2 |
| |
| slt t3, a0, a1 |
| beqz t3, do_reverse |
| |
| andi a2, a2, 0x3 |
| li t4, 1 |
| beqz t2, byte_copy |
| |
| word_copy: |
| lw t3, 0(a1) |
| addi t2, t2, -1 |
| addi a1, a1, 4 |
| sw t3, 0(a0) |
| addi a0, a0, 4 |
| bnez t2, word_copy |
| beqz a2, exit_memcpy |
| j byte_copy |
| |
| do_reverse: |
| add a0, a0, a2 |
| add a1, a1, a2 |
| andi a2, a2, 0x3 |
| li t4, -1 |
| beqz t2, reverse_byte_copy |
| |
| reverse_word_copy: |
| addi a1, a1, -4 |
| addi t2, t2, -1 |
| lw t3, 0(a1) |
| addi a0, a0, -4 |
| sw t3, 0(a0) |
| bnez t2, reverse_word_copy |
| beqz a2, exit_memcpy |
| |
| reverse_byte_copy: |
| addi a0, a0, -1 |
| addi a1, a1, -1 |
| |
| byte_copy: |
| lb t3, 0(a1) |
| addi a2, a2, -1 |
| sb t3, 0(a0) |
| add a1, a1, t4 |
| add a0, a0, t4 |
| bnez a2, byte_copy |
| |
| exit_memcpy: |
| move a0, t0 |
| move a1, t1 |
| ret |
| END(__memmove) |
