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/* Copyright (C) 1996, 1997, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by David Huggins-Daines <dhd@debian.org>, 2000.
Based on the Alpha version by Richard Henderson <rth@tamu.edu>, 1996.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
/* clone() is even more special than fork() as it mucks with stacks
and invokes a function in the right context after its all over. */
#include <asm/unistd.h>
#include <sysdep.h>
#define _ERRNO_H 1
#include <bits/errno.h>
/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg) */
.text
ENTRY(__clone)
/* FIXME: I have no idea how profiling works on hppa. */
/* Sanity check arguments. */
comib,= 0,%arg0,.Lerror /* no NULL function pointers */
ldi -EINVAL,%ret0
comib,= 0,%arg1,.Lerror /* no NULL stack pointers */
nop
/* Save the fn ptr and arg on the new stack. */
stwm %arg0,64(%arg1)
stw %arg3,-60(%arg1)
/* Save the PIC register. */
#ifdef PIC
stw %r19,-32(%sr0, %sp) /* parent */
#endif
/* Do the system call */
copy %arg2,%arg0
ble 0x100(%sr2,%r0)
ldi __NR_clone,%r20
ldi -4096,%r1
comclr,>>= %r1,%ret0,%r0 /* Note: unsigned compare. */
b,n .Lerror
comib,=,n 0,%ret0,thread_start
/* Successful return from the parent
No need to restore the PIC register,
since we return immediately. */
bv %r0(%rp)
nop
/* Something bad happened -- no child created */
.Lerror:
/* Restore the PIC register on error */
#ifdef PIC
ldw -32(%sr0, %sp), %r19 /* parent */
#endif
b __syscall_error
sub %r0,%ret0,%arg0
thread_start:
/* Load up the arguments. */
ldw -60(%sr0, %sp),%arg0
ldw -64(%sr0, %sp),%r22
/* $$dyncall fixes childs PIC register */
/* Call the user's function */
bl $$dyncall,%r31
copy %r31,%rp
bl _exit,%rp
copy %ret0,%arg0
/* Die horribly. */
iitlbp %r0,(%r0)
PSEUDO_END(__clone)
weak_alias(__clone, clone)
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