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/* $OpenBSD: ldasm.S,v 1.32 2017/08/27 21:59:52 deraadt Exp $ */
/*
* Copyright (c) 2002 Dale Rahn
* 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.
*
* 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.
*
*/
#define DL_DATA_SIZE (16*4)
#include <sys/syscall.h>
#include <machine/asm.h>
.text
.align 16,0xcc
.globl _dl_start
.type _dl_start,@function
_dl_start:
movl %esp,%eax # save stack pointer for _rtld
subl $DL_DATA_SIZE,%esp # allocate dl_data
call 1f # push &_DYNAMIC...
1: addl $(_DYNAMIC-1b),(%esp) # ...for dl_boot_bind
movl %esp,%ebx
movl %ebx,%edi # save dl_data arg for dl_boot
pushl %ebx # push dl_data for dl_boot_bind
mov %eax, %esi # save stack for dl_boot
pushl %eax # load saved SP for dl_boot_bind
call _dl_boot_bind@PLT # _dl_boot_bind(sp,dl_data)
pushl %edi # push saved dl_data
movl %edi,%ebp
movl (7*4)(%ebp),%eax
pushl %eax # push loff from dl_data
movl %esi,%ebp
movl $4,%eax
imull 0(%ebp),%eax
addl $8,%eax
addl %ebp,%eax
push %eax # push envp
leal 4(%ebp),%eax
push %eax # push argv
call _dl_boot@PLT # _dl_boot(argv,envp,loff,dl_data)
addl $7*4,%esp # pop args
addl $DL_DATA_SIZE,%esp # return dl_data
call 1f # %edx = cleanup
1: popl %ebx
addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ebx
leal _dl_dtors@GOTOFF(%ebx), %edx
jmp *%eax
.align 16,0xcc
.global _dl_bind_start
.type _dl_bind_start,@function
_dl_bind_start:
pushf # save registers
pushl %eax
pushl %ecx
pushl %edx
pushl %ebx
pushl %ebp
pushl %esi
pushl %edi
pushl %ds
pushl %es
pushl 44(%esp) # Copy of reloff
pushl 44(%esp) # Copy of obj
call _dl_bind@PLT # Call the binder
addl $8,%esp # pop binder args
movl %eax,44(%esp) # Store function to be called in obj
popl %es # restore registers
popl %ds
popl %edi
popl %esi
popl %ebp
popl %ebx
popl %edx
popl %ecx
popl %eax
popf
leal 4(%esp),%esp # Discard reloff, do not change eflags
ret
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