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65 lines
2.0 KiB
ArmAsm
65 lines
2.0 KiB
ArmAsm
/* Copyright (C) 2003-2015 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 _ERRNO_H 1
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#include <bits/errno.h>
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#include <tcb-offsets.h>
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/* Clone the calling process, but without copying the whole address space.
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The calling process is suspended until the new process exits or is
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replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
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and the process ID of the new process to the old process. */
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ENTRY (__vfork)
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/* Load the TCB-cached PID value and negates it. If It it is zero
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sets it to 0x800000. And then sets its value again on TCB field.
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See raise.c for the logic that relies on this value. */
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lwz r0,PID(r2)
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cmpwi cr0,r0,0
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neg r0,r0
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bne- cr0,1f
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lis r0,0x8000
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1: stw r0,PID(r2)
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DO_CALL (SYS_ify (vfork))
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cmpwi cr1,r3,0
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beqlr- 1
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/* Restore the original value of the TCB cache of the PID, if we're
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the parent. But in the child (syscall return value equals zero),
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leave things as they are. */
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lwz r0,PID(r2)
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/* Cannot use clrlwi. here, because cr0 needs to be preserved
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until PSEUDO_RET. */
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clrlwi r4,r0,1
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cmpwi cr1,r4,0
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beq- cr1,1f
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neg r4,r0
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1: stw r4,PID(r2)
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PSEUDO_RET
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PSEUDO_END (__vfork)
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libc_hidden_def (__vfork)
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weak_alias (__vfork, vfork)
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strong_alias (__vfork, __libc_vfork)
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