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Justine Tunney 2020-06-15 07:18:57 -07:00
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libc/sysv/syscall.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"
/ 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
.yoink __FILE__