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/* Copyright (C) 1996, 1997, 1998, 2000, 2003, 2004, 2007
Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Richard Henderson (rth@tamu.edu).
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 <asm/errno.h>
#include <asm/unistd.h>
#include <tcb-offsets.h>
#include <sysdep.h>
#define CLONE_VM 0x00000100
#define CLONE_THREAD 0x00010000
/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
pid_t *ptid, void *tls, pid_t *ctid); */
.text
ENTRY (__clone)
save %sp,-96,%sp
cfi_def_cfa_register(%fp)
cfi_window_save
cfi_register(%o7, %i7)
/* sanity check arguments */
orcc %i0,%g0,%g2
be .Leinval
orcc %i1,%g0,%o1
be .Leinval
mov %i2,%o0
/* The child_stack is the top of the stack, allocate one
whole stack frame from that as this is what the kernel
expects. */
sub %o1, 96, %o1
mov %i3, %g3
mov %i2, %g4
/* ptid */
mov %i4,%o2
/* tls */
mov %i5,%o3
/* ctid */
ld [%fp+92],%o4
/* Do the system call */
set __NR_clone,%g1
ta 0x10
bcs .Lerror
tst %o1
bne __thread_start
nop
jmpl %i7 + 8, %g0
restore %o0,%g0,%o0
.Leinval:
mov EINVAL, %o0
.Lerror:
call HIDDEN_JUMPTARGET(__errno_location)
mov %o0, %i0
st %i0,[%o0]
jmpl %i7 + 8, %g0
restore %g0,-1,%o0
END(__clone)
.type __thread_start,@function
__thread_start:
#ifdef RESET_PID
sethi %hi(CLONE_THREAD), %l0
andcc %g4, %l0, %g0
bne 1f
andcc %g4, CLONE_VM, %g0
bne,a 2f
mov -1,%o0
set __NR_getpid,%g1
ta 0x10
2:
st %o0,[%g7 + PID]
st %o0,[%g7 + TID]
1:
#endif
mov %g0, %fp /* terminate backtrace */
call %g2
mov %g3,%o0
call HIDDEN_JUMPTARGET(_exit),0
nop
.size __thread_start, .-__thread_start
weak_alias (__clone, clone)
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