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2000-02-10 Andreas Jaeger <aj@suse.de> * sysdeps/unix/sysv/linux/mips/clone.S: Rewritten. Based on a patch by Hiroyuki Machida <machida@sm.sony.co.jp>.
122 lines
3.0 KiB
ArmAsm
122 lines
3.0 KiB
ArmAsm
/* Copyright (C) 1996, 1997, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ralf Baechle <ralf@gnu.ai.mit.edu>, 1996.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* clone() is even more special than fork() as it mucks with stacks
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and invokes a function in the right context after its all over. */
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#include <sys/asm.h>
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#include <asm/unistd.h>
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#include <sysdep.h>
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#define _ERRNO_H 1
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#include <bits/errno.h>
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/* int clone(int (*fn)(), void *child_stack, int flags, void *arg) */
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#define FRAMESZ 8*SZREG
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#if _MIPS_SIM == _MIPS_SIM_ABI32
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#define MAX_REG_ARGS 4
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#else
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#define MAX_REG_ARGS 6
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#endif
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.text
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NESTED(__clone,FRAMESZ,sp)
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#ifdef __PIC__
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.set noreorder
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.cpload $25
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.set reorder
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PTR_SUBIU sp,FRAMESZ
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.cprestore SZREG*4
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#else
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PTR_SUBIU sp,FRAMESZ
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#endif
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#ifdef PROF
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.set noat
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move $1,ra
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jal _mcount
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.set at
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#endif
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REG_S s0,FRAMESZ-SZREG*2(sp)
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REG_S s1,FRAMESZ-SZREG*3(sp)
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/* Sanity check arguments. */
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li v0,EINVAL
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beqz a0,error /* no NULL function pointers */
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beqz a1,error /* no NULL stack pointers */
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/* Allocate space on the new stack and copy args over */
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/* Save the arg for user's function */
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move s0,a3 /* Save arg __thread_start. */
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move s1,a0 /* Save func. pointer. */
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/* Do the system call */
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move a0,a2
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li v0,__NR_clone
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syscall
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bnez a3,error
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beqz v0,__thread_start
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/* Successful return from the parent */
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REG_L s0,FRAMESZ-SZREG*2(sp)
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REG_L s1,FRAMESZ-SZREG*3(sp)
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PTR_ADDIU sp,FRAMESZ
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ret
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/* Something bad happened -- no child created */
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error:
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REG_L s0,FRAMESZ-SZREG*2(sp)
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REG_L s1,FRAMESZ-SZREG*3(sp)
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PTR_ADDIU sp,FRAMESZ
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#ifdef PIC
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la t9,__syscall_error
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jr t9
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#else
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j __syscall_error
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#endif
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END(__clone)
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/* Load up the arguments to the function. Put this block of code in
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its own function so that we can terminate the stack trace with our
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debug info.
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At this point we have s0=arg, s1=fn. */
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NESTED(__thread_start,FRAMESZ,sp)
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/* The stackframe has been created on entry of clone(). */
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/* Resort the arg for user's function. */
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move a0,s0
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move t9,s1
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/* Call the user's function. */
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jalr t9
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/* Call _exit rather than doing it inline for breakpoint purposes. */
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move a0,v0
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#ifdef __PIC__
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la t9,_exit
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jalr t9
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#else
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jal _exit
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#endif
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END(__thread_start)
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weak_alias(__clone, clone)
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