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/* * $OpenBSD: mdprologue.S,v 1.3 2001/09/05 08:22:36 espie Exp $*/
/*
* Copyright (c) 1993 Paul Kranenburg
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Paul Kranenburg.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/*
* i386 run-time link editor entry points.
*/
#include <sys/syscall.h>
.text
.globl _binder, _binder_entry
/*
* _rtl(int version, struct crt_ldso *crtp)
*/
_rtl: # crt0 calls us here
pushl %ebp # Allocate stack frame
movl %esp,%ebp
pushl %ebx
call 1f # PIC function prologue
1:
popl %ebx
addl $__GLOBAL_OFFSET_TABLE_+[.-1b],%ebx
movl 12(%ebp),%eax # Extract data from interface structure
movl (%eax),%eax # base address of ld.so (first field)
# setup arguments for rtld()
movl (%ebx),%ecx # 1st entry in GOT is our __DYNAMIC
addl %eax,%ecx # add load address
pushl %ecx # 3rd arg
pushl 12(%ebp) # 2nd arg == &crt.
pushl 8(%ebp) # 1st arg == version
addl _rtld@GOT(%ebx),%eax # relocate address of function
call %eax # _rtld(version, crtp, DYNAMIC)
addl $12,%esp # pop arguments
popl %ebx
leave # remove stack frame
ret
# First call to a procedure generally comes through here for
# binding.
_binder_entry:
pushl %ebp # setup a stack frame
movl %esp,%ebp
pusha # save all regs
xorl %eax,%eax # clear
movl 4(%ebp),%esi # return address in PLT
movw (%esi),%ax # get hold of relocation number
subl $6,%esi # make it point to the jmpslot
pushl %eax # pushd arguments
pushl %esi #
call _binder@PLT # _binder(rpc, index)
addl $8,%esp # pop arguments
movl %eax,4(%ebp) # return value from _binder() == actual
# address of function
popa # restore regs
leave # remove our stack frame
ret
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