mirror of
https://github.com/jart/cosmopolitan.git
synced 2026-11-07 10:36:04 -10:00
50 lines
2.4 KiB
ArmAsm
50 lines
2.4 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
|
|
│ vi: set noet ft=asm ts=8 sw=8 fenc=utf-8 :vi │
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2023 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"
|
|
|
|
// Invokes system call.
|
|
//
|
|
// This function has eight parameters. The first seven are for
|
|
// arguments passed along to the system call. The eight is for
|
|
// the magic number that indicates which system call is called
|
|
//
|
|
// The return value follows the Linux kernel convention, where
|
|
// errors are returned as `-errno`. BSD systems are normalized
|
|
// to follow this convention automatically.
|
|
SystemCall:
|
|
#ifdef __aarch64__
|
|
mov x8,x7
|
|
mov x9,0
|
|
adds x9,x9,0
|
|
svc 0
|
|
bcs 1f
|
|
ret
|
|
1: neg x0,x0
|
|
ret
|
|
#else
|
|
mov %rcx,%r10
|
|
mov 16(%rsp),%eax
|
|
clc
|
|
syscall
|
|
jnc 1f
|
|
neg %rax
|
|
1: ret
|
|
#endif
|
|
.endfn SystemCall,globl
|