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/* Copyright (C) 1996 Free Software Foundation, Inc.
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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 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
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, 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 <errnos.h>
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/* int clone (int (*fn) (), void *child_stack, int flags, int nargs, ...) */
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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
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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
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movel 16(%sp), %d1 /* no negative argument counts */
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jmi syscall_error
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/* Allocate space on the new stack and copy args over */
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movel %d1, %d0
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negl %d0
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lea (%a1,%d0.l*4), %a1
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jeq 2f
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1: movel 16(%sp,%d1.l*4), -4(%a1,%d1.l*4)
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subql #1, %d1
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jne 1b
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2:
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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
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jeq thread_start
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rts
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SYSCALL_ERROR_HANDLER
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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, -(%sp)
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#ifdef PIC
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bsrl _exit@PLTPC
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#else
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jbsr _exit
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#endif
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weak_alias (__clone, clone)
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