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/* Copyright (C) 2000, 2001, 2003 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 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. */
#include <sysdep.h>
#include <asm/errno.h>
/* int __clone2(int (*fn) (void *arg), void *child_stack_base, */
/* size_t child_stack_size, int flags, void *arg, */
/* pid_t *child_tid, pid_t *parent_tid, */
/* struct user_desc *tls) */
ENTRY(__clone2)
alloc r2=ar.pfs,8,2,6,0
cmp.eq p6,p0=0,in0
mov r8=EINVAL
(p6) br.cond.spnt.few __syscall_error
;;
flushrs /* This is necessary, since the child */
/* will be running with the same */
/* register backing store for a few */
/* instructions. We need to ensure */
/* that it will not read or write the */
/* backing store. */
mov loc0=in0 /* save fn */
mov loc1=in4 /* save arg */
mov out0=in3 /* Flags are first syscall argument. */
mov out1=in1 /* Stack address. */
mov out2=in2 /* Stack size. */
mov out3=in5 /* Child TID Pointer */
mov out4=in6 /* Parent TID Pointer */
mov out5=in7 /* TLS pointer */
DO_CALL (SYS_ify (clone2))
cmp.eq p6,p0=-1,r10
;;
(p6) br.cond.spnt.few __syscall_error
# define CHILD p6
# define PARENT p7
cmp.eq CHILD,PARENT=0,r8 /* Are we the child? */
;;
(CHILD) ld8 out1=[loc0],8 /* Retrieve code pointer. */
(CHILD) mov out0=loc1 /* Pass proper argument to fn */
(PARENT) ret
;;
ld8 gp=[loc0] /* Load function gp. */
mov b6=out1
;;
br.call.dptk.few rp=b6 /* Call fn(arg) in the child */
;;
mov out0=r8 /* Argument to _exit */
.globl _exit
br.call.dpnt.few rp=_exit /* call _exit with result from fn. */
ret /* Not reached. */
PSEUDO_END(__clone2)
/* For now we leave __clone undefined. This is unlikely to be a */
/* problem, since at least the i386 __clone in glibc always failed */
/* with a 0 sp (eventhough the kernel explicitly handled it). */
/* Thus all such calls needed to pass an explicit sp, and as a result, */
/* would be unlikely to work on ia64. */
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