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/* Copyright (C) 1997, 2000 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, 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/errno.h>
#include <asm/unistd.h>
#include <tcb-offsets.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); */
.register %g2,#scratch
.register %g3,#scratch
.text
.align 4
.globl __clone
.type __clone,@function
__clone:
save %sp, -192, %sp
/* sanity check arguments */
brz,pn %i0, 99f /* fn non-NULL? */
mov %i0, %g2
brz,pn %i1, 99f /* child_stack non-NULL? */
mov %i2, %o0 /* clone flags */
/* The child_stack is the top of the stack, allocate one
whole stack frame from that as this is what the kernel
expects. Also, subtract STACK_BIAS. */
sub %i1, 192 + 0x7ff, %o1
mov %i3, %g3
mov %i2, %g4
mov %i4,%o2 /* PTID */
mov %i5,%o3 /* TLS */
ldx [%fp+0x7ff+176],%o4 /* CTID */
/* Do the system call */
set __NR_clone, %g1
ta 0x6d
bcs,pn %xcc, 99f
nop
brnz,pn %o1, __thread_start
nop
ret
restore %o0, %g0, %o0
99:
#ifndef _LIBC_REENTRANT
#ifdef PIC
call 1f
sethi %hi(_GLOBAL_OFFSET_TABLE_-(99b-.)), %l7
1: or %l7, %lo(_GLOBAL_OFFSET_TABLE_-(99b-.)), %l7
add %l7, %o7, %l7
set EINVAL, %i0
sethi %hi(errno), %g2
or %g2, %lo(errno), %g2
st %i0, [%l7+%g2]
#else
sethi %hi(errno), %g2
set EINVAL, %i0
st %i0, [%g2+%lo(errno)]
#endif
#else
call __errno_location
nop
st %i0, [%o0]
#endif
ret
restore %g0,-1,%o0
.size __clone, .-__clone
.type __thread_start,@function
__thread_start:
#ifdef RESET_PID
sethi %hi(CLONE_THREAD), %l0
andcc %g4, %l0, %g0
bne,pt %icc, 1f
andcc %g4, CLONE_VM, %g0
bne,a,pn %icc, 2f
mov -1,%o0
set __NR_getpid,%g1
ta 0x6d
2: st %o0,[%g7 + PID]
st %o0,[%g7 + TID]
1:
#endif
mov %g0, %fp /* terminate backtrace */
call %g2
mov %g3,%o0
call _exit,0
nop
.size __thread_start, .-__thread_start
weak_alias(__clone, clone)
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