cosmopolitan/libc/nexgen32e/lolendian.S

79 lines
2.9 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
Permission to use, copy, modify, and/or distribute this software for
any purpose with or without fee is hereby granted, provided that the
above copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
*/
#include "libc/macros.h"
/ @fileoverview Byte-order conversion functions.
/
/ Endianness is deceptively complicated to the uninitiated. Many
/ helpers have been written by our top minds to address perceived
/ difficulties. These ones got through standardization processes.
/ To protect their legacy, all 19 functions have been implemented
/ in just 17 bytes.
/
/ @asyncsignalsafe
/ @see read32le(), read32be(), etc.
bswap_64:
htobe64:
htole64:
be64toh:
le64toh:mov %rdi,%rax
bswap %rax
ret
.endfn le64toh,globl
.endfn be64toh,globl
.endfn htole64,globl
.endfn htobe64,globl
.endfn bswap_64,globl
bswap_32:
htobe32:
htole32:
be32toh:
le32toh:
ntohl:
htonl: mov %edi,%eax
bswap %eax
ret
.endfn htonl,globl
.endfn htole32,globl
.endfn le32toh,globl
.endfn be32toh,globl
.endfn htobe32,globl
.endfn ntohl,globl
.endfn bswap_32,globl
bswap_16:
htobe16:
htole16:
be16toh:
le16toh:
ntohs:
htons: movzwl %di,%eax
xchg %al,%ah
ret
.endfn htobe16,globl
.endfn htons,globl
.endfn le16toh,globl
.endfn be16toh,globl
.endfn htole16,globl
.endfn ntohs,globl
.endfn bswap_16,globl
.source __FILE__