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/* Wrapper around clone system call.
Copyright (C) 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <sysdep.h>
#define _ERRNO_H 1
#include <errnos.h>
/* This is the only really unusual system call in PPC linux, but not
because of any weirdness in the system call itself; because of
all the freaky stuff we have to do to make the call useful. */
/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
ENTRY(clone)
/* Set up stack frame, save registers. */
stwu 1,-20(1)
stw 31,16(1)
/* Check for child_stack == NULL, fn == NULL. */
mr. 31,4
cmpwi 1,3,0
cror 2+0*4,2+0*4,2+1*4
beq- 0,badargs
/* Save 'fn' and its argument on the new stack. */
stw 3,0(4)
stw 6,4(4)
/* 'flags' argument is (only) parameter to clone syscall. */
mr 3,5
/* Do the call. */
DO_CALL(SYS_ify(clone))
bso- error
beq child
/* Parent. Restore registers & return. */
lwz 31,20(1)
addi 1,1,20
blr
child:
/* Get address of procedure to call. */
lwz 0,0(31)
/* Set up argument register. */
lwz 3,4(31)
mtlr 0
/* Switch to new stack. */
mr 1,31
/* Call procedure. */
blrl
/* Call _exit with result from procedure. */
DO_CALL (SYS_ify (exit))
badargs:
li 3,-EINVAL
error:
b __syscall_error
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