mirror of
https://github.com/jart/cosmopolitan.git
synced 2026-11-09 10:49:42 -10:00
44 lines
2.7 KiB
ArmAsm
44 lines
2.7 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.internal.h"
|
|
.source __FILE__
|
|
|
|
// Performs raw System Five system call.
|
|
//
|
|
// This function provides a direct path into system call support
|
|
// that's friendly to C code, since it doesn't need an intermediate
|
|
// thunk. It only supports arities up to six, since there's no way
|
|
// to do more safely; this isn't a problem with Linux, although
|
|
// certain BSD calls may not be available.
|
|
//
|
|
// @param %rdi is system call ordinal, which isn't translated,
|
|
// and must be correct for the underlying host system
|
|
// @param %rsi,%rdx,%rcx,%r8,%r9 may supply parameters 1 through 5
|
|
// @param sixth is optionally pushed on the stack before call
|
|
// @return %rax has result, or -1 w/ errno on failure
|
|
syscall:mov %rdi,%rax
|
|
mov %rsi,%rdi
|
|
mov %rdx,%rsi
|
|
mov %rcx,%rdx
|
|
mov %r8,%rcx # ← intended
|
|
mov %r9,%r8
|
|
mov 8(%rsp),%r9
|
|
jmp *__systemfive(%rip)
|
|
.endfn syscall,globl
|