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/*
Copyright 2022 Gabriel Jensen
This file is part of rgo.
rgo is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
rgo is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along with rgo. If not, see <https://www.gnu.org/licenses/>.
*/
#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__)
/* rax: Address of the current element. */
movq %rdi,%rax
/* rax: Address of the element after the last element. */
movq %rdi,%rcx
addq %rsi,%rcx
.loop:
cmpq %rcx,%rax
je .done /* Exit loop if we have reached the final element. */
movb %dl,(%rax)
incq %rax
jmp .loop /* Continue to next element. */
.done:
ret
#endif
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