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Justine Tunney 2020-06-15 07:18:57 -07:00
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libc/nexgen32e/memmove.S Normal file
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/*-*- mode:asm; 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
_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,hidden
.endfn memmove,globl
.yoink __FILE__