51 lines
2.5 KiB
ArmAsm
51 lines
2.5 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/dce.h"
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#include "libc/macros.h"
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/ Forks process without copying page tables.
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/
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/ This is the same as fork() except it's optimized for the case
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/ where the caller invokes exec() immediately afterwards.
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/
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/ @return pid of child process or 0 if forked process
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/ @returnstwice
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vfork: testb IsWindows()
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jnz fork$nt
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mov __NR_vfork(%rip),%eax
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cmp $-1,%eax
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je systemfive.enosys
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pop %rsi
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testb IsBsd()
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jnz vfork.bsd
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syscall
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push %rsi
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cmp $-4095,%rax
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jae systemfive.error
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ret
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.endfn vfork,globl
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vfork.bsd:
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syscall
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push %rsi
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jc systemfive.errno
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ret
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.endfn vfork.bsd
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