minix/libexec/ld.elf_so/arch/i386/rtld_start.S

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/* $NetBSD: rtld_start.S,v 1.11 2010/12/05 00:56:07 joerg Exp $ */
/*-
* Copyright (c) 1998, 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas and by Charles M. Hannum.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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.
*/
#include <machine/asm.h>
.text
.align 4
.globl .rtld_start
.hidden .rtld_start
.type .rtld_start,@function
.rtld_start:
subl $8,%esp # make room of obj_main and exit proc
pushl %ebx # save ps_strings
call 1f
1:
popl %edx
leal _DYNAMIC-1b(%edx),%ecx # &_DYNAMIC
movl %ecx,%ebx
subl _GLOBAL_OFFSET_TABLE_-1b(%edx),%ebx
pushl %ebx # relocbase
pushl %ecx # &_DYNAMIC
call _rtld_relocate_nonplt_self
leal 12(%esp),%eax # &cleanup
pushl %ebx # relocbase
pushl %eax # sp
call _rtld # _rtld(sp, relocbase)
addl $16,%esp # pop args
popl %ebx # %ebx = ps_strings
popl %edx # %edx = cleanup
popl %ecx # %ecx = obj_main
jmp *%eax
.align 4
.globl _rtld_bind_start
.hidden _rtld_bind_start
.type _rtld_bind_start,@function
_rtld_bind_start: # (obj, reloff)
pushf # save registers
pushl %eax
pushl %ecx
pushl %edx
pushl 20(%esp) # Copy of reloff
pushl 20(%esp) # Copy of obj
call _rtld_bind # Call the binder
addl $8,%esp # pop binder args
movl %eax,20(%esp) # Store function to be called in obj
popl %edx
popl %ecx
popl %eax
popf
leal 4(%esp),%esp # Discard reloff, do not change eflags
ret