56 lines
2.4 KiB
ArmAsm
56 lines
2.4 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
|
||
│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
|
||
╞══════════════════════════════════════════════════════════════════════════════╡
|
||
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
||
│ │
|
||
│ This program is free software; you can redistribute it and/or modify │
|
||
│ it under the terms of the GNU General Public License as published by │
|
||
│ the Free Software Foundation; version 2 of the License. │
|
||
│ │
|
||
│ This program 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 │
|
||
│ General Public License for more details. │
|
||
│ │
|
||
│ You should have received a copy of the GNU General Public License │
|
||
│ along with this program; if not, write to the Free Software │
|
||
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
|
||
│ 02110-1301 USA │
|
||
╚─────────────────────────────────────────────────────────────────────────────*/
|
||
#include "libc/macros.h"
|
||
|
||
/ Copies memory.
|
||
/
|
||
/ DEST and SRC may overlap.
|
||
/
|
||
/ @param rdi is dest
|
||
/ @param rsi is src
|
||
/ @param rdx is number of bytes
|
||
/ @return original rdi copied to rax
|
||
/ @asyncsignalsafe
|
||
memmove:
|
||
mov %rdi,%rax
|
||
/ 𝑠𝑙𝑖𝑑𝑒
|
||
.endfn MemMove,globl,hidden
|
||
|
||
MemMove:
|
||
.leafprologue
|
||
.profilable
|
||
push %rcx
|
||
push %rdi
|
||
push %rsi
|
||
mov %rdx,%rcx
|
||
cmp %rsi,%rdi
|
||
jb 1f
|
||
lea -1(%rdi,%rcx),%rdi
|
||
lea -1(%rsi,%rcx),%rsi
|
||
std
|
||
1: rep movsb
|
||
cld
|
||
pop %rsi
|
||
pop %rdi
|
||
pop %rcx
|
||
.leafepilogue
|
||
.endfn memmove,globl
|
||
.source __FILE__
|