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67 lines
1.9 KiB
ArmAsm
67 lines
1.9 KiB
ArmAsm
/* Copyright (C) 1996,97,98,2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Andreas Schwab (schwab@issan.informatik.uni-dortmund.de)
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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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/* clone is even more special than fork as it mucks with stacks
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and invokes a function in the right context after its all over. */
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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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/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
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.text
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ENTRY (__clone)
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/* Sanity check arguments. */
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movel #-EINVAL, %d0
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movel 4(%sp), %a0 /* no NULL function pointers */
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tstl %a0
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jeq SYSCALL_ERROR_LABEL
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movel 8(%sp), %a1 /* no NULL stack pointers */
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tstl %a1
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jeq SYSCALL_ERROR_LABEL
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/* Allocate space and copy the argument onto the new stack. */
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movel 16(%sp), -(%a1)
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/* Do the system call */
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exg %d2, %a1 /* save %d2 and get stack pointer */
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movel 12(%sp), %d1 /* get flags */
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movel #SYS_ify (clone), %d0
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trap #0
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exg %d2, %a1 /* restore %d2 */
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tstl %d0
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jmi SYSCALL_ERROR_LABEL
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jeq thread_start
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rts
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thread_start:
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subl %fp, %fp /* terminate the stack frame */
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jsr (%a0)
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movel %d0, %d1
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movel #SYS_ify (exit), %d0
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trap #0
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PSEUDO_END (__clone)
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weak_alias (__clone, clone)
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