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60 lines
1.8 KiB
ArmAsm
60 lines
1.8 KiB
ArmAsm
/* Copyright (C) 2000-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#define _SIGNAL_H
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#include <bits/signum.h>
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#include <tcb-offsets.h>
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/* The following are defined in linux/sched.h, which unfortunately */
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/* is not safe for inclusion in an assembly file. */
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#define CLONE_VM 0x00000100 /* set if VM shared between processes */
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#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
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/* pid_t vfork(void); */
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/* Implemented as __clone_syscall(CLONE_VFORK | CLONE_VM | SIGCHLD, 0) */
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ENTRY(__vfork)
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.prologue // work around a GAS bug which triggers if
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.body // first .prologue is not at the beginning of proc.
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alloc r2=ar.pfs,0,0,2,0
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adds r14=PID,r13
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;;
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ld4 r16=[r14]
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;;
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sub r15=0,r16
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mov out0=CLONE_VM+CLONE_VFORK+SIGCHLD
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mov out1=0 /* Standard sp value. */
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;;
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st4 [r14]=r15
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DO_CALL (SYS_ify (clone))
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cmp.eq p0,p7=0,r8
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adds r14=PID,r13
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;;
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(p7) ld4 r16=[r14]
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cmp.eq p6,p0=-1,r10
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;;
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(p7) sub r15=0,r16
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;;
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(p7) st4 [r14]=r15
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(p6) br.cond.spnt.few __syscall_error
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ret
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PSEUDO_END(__vfork)
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weak_alias (__vfork, vfork)
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