1997-07-12 23:32:57 +00:00
|
|
|
/* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
|
|
|
|
|
This file is part of the GNU C Library.
|
|
|
|
|
Contributed by Ralf Baechle <ralf@gnu.ai.mit.edu>, 1996.
|
|
|
|
|
|
|
|
|
|
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 <sys/asm.h>
|
|
|
|
|
#include <asm/unistd.h>
|
|
|
|
|
#include <sysdep.h>
|
|
|
|
|
#define _ERRNO_H 1
|
|
|
|
|
#include <bits/errno.h>
|
|
|
|
|
|
|
|
|
|
/* int clone(int (*fn)(), void *child_stack, int flags, int nargs, ...) */
|
|
|
|
|
|
|
|
|
|
#define FRAMESZ 4*SZREG
|
|
|
|
|
#if _MIPS_SIM == _MIPS_SIM_ABI32
|
|
|
|
|
#define MAX_REG_ARGS 4
|
|
|
|
|
#else
|
|
|
|
|
#define MAX_REG_ARGS 6
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
.text
|
|
|
|
|
NESTED(__clone,4*SZREG,sp)
|
1997-07-26 02:33:13 +00:00
|
|
|
#ifdef PIC
|
1997-07-12 23:32:57 +00:00
|
|
|
.set noreorder
|
|
|
|
|
.cpload $25
|
|
|
|
|
.set reorder
|
|
|
|
|
.cprestore 16
|
|
|
|
|
#endif
|
|
|
|
|
PTR_SUBIU sp,FRAMESZ
|
|
|
|
|
#ifdef PROF
|
|
|
|
|
.set noat
|
|
|
|
|
move $1,ra
|
|
|
|
|
jal _mcount
|
|
|
|
|
.set at
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
/* Sanity check arguments. */
|
|
|
|
|
li v0,EINVAL
|
|
|
|
|
beqz a0,error /* no NULL function pointers */
|
|
|
|
|
beqz a1,error /* no NULL stack pointers */
|
|
|
|
|
bltz a3,error /* no negative argument counts */
|
|
|
|
|
|
|
|
|
|
/* Allocate space on the new stack and copy args over */
|
|
|
|
|
move t0,a3 # save nargs for __thread_start
|
|
|
|
|
PTR_SLL t1,a3,PTR_SCALESHIFT
|
|
|
|
|
PTR_ADDU t1,a3,sp
|
|
|
|
|
1: REG_L t2,-SZREG(t1)
|
|
|
|
|
PTR_SUBIU t1,SZREG
|
|
|
|
|
REG_S t2,-SZREG(a1)
|
|
|
|
|
PTR_SUBIU a3,1
|
|
|
|
|
PTR_SUBIU a1,SZREG
|
|
|
|
|
bnez a3,1b
|
|
|
|
|
|
|
|
|
|
/* Do the system call */
|
|
|
|
|
move t9,a0 # get fn ptr out of the way
|
|
|
|
|
move a0,a2
|
|
|
|
|
li v0,__NR_clone
|
|
|
|
|
syscall
|
|
|
|
|
|
|
|
|
|
bnez a3,error
|
|
|
|
|
beqz v0,__thread_start
|
|
|
|
|
|
|
|
|
|
/* Successful return from the parent */
|
|
|
|
|
PTR_ADDIU sp,FRAMESZ
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
/* Something bad happened -- no child created */
|
|
|
|
|
error:
|
|
|
|
|
PTR_ADDIU sp,FRAMESZ
|
|
|
|
|
#ifdef PIC
|
|
|
|
|
la t9,__syscall_error
|
|
|
|
|
jr t9
|
|
|
|
|
#else
|
|
|
|
|
j __syscall_error
|
|
|
|
|
#endif
|
|
|
|
|
END(__clone)
|
|
|
|
|
|
|
|
|
|
/* Load up the arguments to the function. Put this block of code in
|
|
|
|
|
its own function so that we can terminate the stack trace with our
|
|
|
|
|
debug info.
|
|
|
|
|
|
|
|
|
|
At this point we have t0=nargs, t9=fn, sp=&arg[0]. */
|
|
|
|
|
|
|
|
|
|
NESTED(__thread_start,32,sp)
|
|
|
|
|
/* Stackframe has been created on entry of clone() */
|
|
|
|
|
/* Calculate address of jump into argument loading code */
|
|
|
|
|
li t1,MAX_REG_ARGS
|
|
|
|
|
slt t0,t1,t2 /* max MAX_REG_ARGS args in registers */
|
|
|
|
|
MOVN (t2,t1,t0)
|
|
|
|
|
la v0,arg0
|
|
|
|
|
PTR_SLL t1,t0,PTR_SCALESHIFT
|
|
|
|
|
PTR_SUBU v0,t1
|
|
|
|
|
jr v0
|
|
|
|
|
|
|
|
|
|
/* Load the integer register arguments */
|
|
|
|
|
REG_L a0,SZREG(sp)
|
|
|
|
|
arg0:
|
|
|
|
|
|
|
|
|
|
/* Call the user's function */
|
|
|
|
|
jalr t9
|
|
|
|
|
|
|
|
|
|
/* Call _exit rather than doing it inline for breakpoint purposes */
|
|
|
|
|
move a0,v0
|
|
|
|
|
jal _exit
|
|
|
|
|
|
|
|
|
|
END(__thread_start)
|
|
|
|
|
|
|
|
|
|
weak_alias(__clone, clone)
|
