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/* Copyright (C) 2003, 2004 Free Software Foudnation, Inc.
This file is part of the GNU C Library.
Contributed by Alexandre Oliva <aoliva@redhat.com>, 2003.
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, see
<http://www.gnu.org/licenses/>. */
/* 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 <features.h>
#include <asm/unistd.h>
#define _ERRNO_H 1
#include <bits/errno.h>
.text
.globl clone
.type clone,@function
/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg) */
clone:
/* Sanity check arguments. */
cmp.p gr8, gr0, icc0
cmp gr9, gr0, icc1
mov.p gr8, gr4
beq icc0, #0, .Lerror
mov.p gr11, gr5
beq icc1, #0, .Lerror
mov.p gr10, gr8
setlos #__NR_clone, gr7
tra gr0,gr0
cmp.p gr8, gr0, icc0
setlos #-4096, gr6
cmp.p gr8, gr6, icc1
beq icc0, #0, .Lthread_start
blslr icc1, #2
.Lsys_error:
sethi.p #gotofffuncdeschi(__syscall_error), gr14
setlo #gotofffuncdesclo(__syscall_error), gr14
ldd @(gr14, gr15), gr14
jmpl @(gr14, gr0)
.Lerror:
setlos.p #-EINVAL, gr8
bra .Lsys_error
###############################################################################
#
# come here as the new thread [GR4 is fn, GR5 is arg]
#
###############################################################################
.Lthread_start:
/* Save the PIC register. */
mov gr15, gr17
/* Call the user's function. */
ldd.p @(gr4, gr0), gr14
mov gr5, gr8
calll @(gr14, gr0)
/* Call _exit, rather simply inlining the syscall, such that
breakpoints work.*/
mov.p gr17, gr15
call HIDDEN_JUMPTARGET(_exit)
/* Should never get here. */
jmpl @(gr0, gr0)
.size clone,.-clone
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