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72 lines
1.9 KiB
ArmAsm
72 lines
1.9 KiB
ArmAsm
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/* Copyright (C) 2004 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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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/* Save the PID value. */
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stc gbr, r2
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mov.w .L2, r0
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mov.l @(r0,r2), r4
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neg r4, r1
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tst r1, r1
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bf 1f
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mov #1, r1
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rotr r1
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1:
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mov.l r1, @(r0,r2)
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mov.w .L1, r3
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trapa #0x10
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mov r0, r1
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/* Restore the old PID value in the parent. */
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tst r0, r0
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bt.s 2f
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stc gbr, r2
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mov.w .L2, r0
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mov.l r4, @(r0,r2)
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mov r1, r0
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2:
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mov #-12, r2
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shad r2, r1
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not r1, r1 // r1=0 means r0 = -1 to -4095
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tst r1, r1 // i.e. error in linux
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bf .Lpseudo_end
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SYSCALL_ERROR_HANDLER
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.Lpseudo_end:
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rts
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nop
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.L1:
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.word __NR_vfork
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.L2:
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.word PID - TLS_PRE_TCB_SIZE
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.align 2
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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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