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/* Copyright (C) 1999,2000 Free Software Foundation, Inc.
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. */
/* 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 <sysdep.h>
/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
/*
* Used for both clone and fork system calls. Note that if fn is NULL
* then clone was called from fork.
*/
ENTRY(__clone)
add r2 = -16, r33 // save space for fn and arg
cmp.ne p6,p0 = 0,r33
;;
(p6) add r33 = -16, r33
add r12 = -16, r12
;;
(p6) st8 [r2] = r32, 8 // save fn for child
st8 [r12] = r32 // save fn for parent
;;
(p6) st8 [r2] = r35 // save arg for child
mov r32 = r34 // put flags in out0
DO_CALL (SYS_ify (clone))
1:
ld8 r33 = [r12], 8 // recover fn
;;
ld8 r32 = [r12], 8 // recover arg
cmp.eq p6,p0=-1,r10
(p6) br.cond.spnt.many __syscall_error // handle error
cmp.ne p7,p0=0,r8
(p7) ret // parent process, just return
cmp.eq p8,p0=0,r33
(p8) ret // fork call, return
alloc loc0 = ar.pfs,2,2,2,0
;;
ld8 r2 = [in1], 8 // get address of fn
mov out0 = in0
mov loc1 = gp // save gp across indirect call
;;
ld8 gp = [in1] // set new gp
mov b6 = r2
br.call.sptk b0 = b6 // call thread routine
;;
mov ar.pfs = loc0
mov gp = loc1
mov r32 = r8 // exit value
br.call.sptk b0 = _exit // we're out of here
PSEUDO_END(__clone)
weak_alias (__clone, clone)
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