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109 lines
2.7 KiB
ArmAsm
109 lines
2.7 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 *arg), void *child_stack, int flags, void *arg) */
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.text
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NESTED(__clone,4*SZREG,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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subu sp,32
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.cprestore 16
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#else
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subu sp,32
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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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/* 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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subu a1,32 /* Reserve argument save space. */
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sw a0,0(a1) /* Save function pointer. */
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sw a3,4(a1) /* Save argument 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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addiu sp,32
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ret
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/* Something bad happened -- no child created */
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error:
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addiu sp,32
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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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ENTRY(__thread_start)
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/* cp is already loaded. */
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.cprestore 16
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/* The stackframe has been created on entry of clone(). */
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/* Restore the arg for user's function. */
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lw t9,0(sp) /* Function pointer. */
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lw a0,4(sp) /* Argument pointer. */
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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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