| /* SPDX-License-Identifier: GPL-2.0-only */ | |
| #include <arch/asm.h> | |
| /* | |
| * Copy a buffer from src to dest (alignment handled by the hardware) | |
| * | |
| * Parameters: | |
| * x0 - dest | |
| * x1 - src | |
| * x2 - n | |
| * Returns: | |
| * x0 - dest | |
| */ | |
| ENTRY(memcpy) | |
| mov x4, x0 | |
| subs x2, x2, #8 | |
| b.mi 2f | |
| 1: ldr x3, [x1], #8 | |
| subs x2, x2, #8 | |
| str x3, [x4], #8 | |
| b.pl 1b | |
| 2: adds x2, x2, #4 | |
| b.mi 3f | |
| ldr w3, [x1], #4 | |
| sub x2, x2, #4 | |
| str w3, [x4], #4 | |
| 3: adds x2, x2, #2 | |
| b.mi 4f | |
| ldrh w3, [x1], #2 | |
| sub x2, x2, #2 | |
| strh w3, [x4], #2 | |
| 4: adds x2, x2, #1 | |
| b.mi 5f | |
| ldrb w3, [x1] | |
| strb w3, [x4] | |
| 5: ret | |
| ENDPROC(memcpy) |