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113 lines
2.4 KiB
ArmAsm
113 lines
2.4 KiB
ArmAsm
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/* Copyright (C) 1999, 2000 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 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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/* 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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#ifdef __NR_vfork
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mov #+__NR_vfork, r0
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trapa #0
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mov r0, r1
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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 1f
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mov.w .L1, r1
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cmp/eq r1, r0
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bt 2f
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mov.l .L2, r1
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#ifdef SHARED
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mov r0, r4
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mov.l r12, @-r15
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sts.l pr, @-r15
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mov.l 0f, r12
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mova 0f, r0
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add r0, r12
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mova .L2, r0
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add r0, r1
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jsr @r1
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nop
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lds.l @r15+, pr
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rts
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mov.l @r15+, r12
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.align 2
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0:
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.long _GLOBAL_OFFSET_TABLE_
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#else
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jmp @r1
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mov r0, r4
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#endif
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.L1:
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.word -ENOSYS
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1:
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rts
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nop
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2:
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#endif
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/* If we don't have vfork, fork is close enough. */
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mov #+__NR_fork, r0
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trapa #0
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mov r0, r1
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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 1f
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mov.l .L2, r1
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#ifdef SHARED
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mov r0, r4
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mov.l r12, @-r15
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sts.l pr, @-r15
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mov.l 0f, r12
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mova 0f, r0
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add r0, r12
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mova .L2, r0
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add r0, r1
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jsr @r1
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nop
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lds.l @r15+, pr
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rts
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mov.l @r15+, r12
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.align 2
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0:
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.long _GLOBAL_OFFSET_TABLE_
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#else
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jmp @r1
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mov r0, r4
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#endif
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.align 2
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.L2:
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.long PLTJMP(C_SYMBOL_NAME(__syscall_error))
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1:
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rts
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nop
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PSEUDO_END (__vfork)
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weak_alias (__vfork, vfork)
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