blob: f01cd65ce061b17c51adda91c4cd87793e3792b5 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
/*
Copyright 2022 Gabriel Jensen.
This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
#include <rgo.h>
.global rgo_memfill
rgo_memfill:
/*
void const * ptr
size_t num
uint8_t val
*/
#if defined(__i386__)
/* eax: Address of the current element. */
movl 0x4(%esp),%eax
/* ecx: Address of the element after the last element. */
movl 0x4(%esp),%ecx
addl 0x8(%esp),%ecx
/* rdx: Byte value. */
movb 0xC(%esp),%dl
.loop:
cmpl %eax,%ecx
je .done /* Exit loop if we have reached the final element. */
movb %dl,(%eax)
incl %eax
jmp .loop /* Continue to next element. */
.done:
ret
#elif defined(__x86_64__)
/* rdi: Address of the current element. */
/* rsi: Address of the element after the last element. */
addq %rdi,%rsi
.loop:
cmpq %rsi,%rdi
je .done /* Exit loop if we have reached the final element. */
movb %dl,(%rdi)
incq %rdi
jmp .loop /* Continue to next element. */
.done:
ret
#endif
|
