mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-12-27 05:21:08 +01:00
89 lines
3.5 KiB
ArmAsm
89 lines
3.5 KiB
ArmAsm
/*-
|
|
* Copyright 1996-1998 John D. Polstra.
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
.text
|
|
.align 4
|
|
.globl .rtld_start
|
|
.type .rtld_start,@function
|
|
.rtld_start:
|
|
xorl %ebp,%ebp # Clear frame pointer for good form
|
|
movl %esp,%eax # Save initial stack pointer
|
|
subl $8,%esp # A place to store exit procedure addr
|
|
movl %esp,%ebx # save address of exit proc
|
|
movl %esp,%ecx # construct address of obj_main
|
|
addl $4,%ecx
|
|
pushl %ecx # Pass address of obj_main
|
|
pushl %ebx # Pass address of exit proc
|
|
pushl %eax # Pass initial stack pointer to rtld
|
|
call _rtld@PLT # Call rtld(sp); returns entry point
|
|
addl $12,%esp # Remove arguments from stack
|
|
popl %edx # Get exit procedure address
|
|
addl $4,%esp # Ignore obj_main
|
|
/*
|
|
* At this point, %eax contains the entry point of the main program, and
|
|
* %edx contains a pointer to a termination function that should be
|
|
* registered with atexit(). (crt1.o registers it.)
|
|
*/
|
|
.globl .rtld_goto_main
|
|
.rtld_goto_main: # This symbol exists just to make debugging easier.
|
|
jmp *%eax # Enter main program
|
|
|
|
|
|
/*
|
|
* Binder entry point. Control is transferred to here by code in the PLT.
|
|
* On entry, there are two arguments on the stack. In ascending address
|
|
* order, they are (1) "obj", a pointer to the calling object's Obj_Entry,
|
|
* and (2) "reloff", the byte offset of the appropriate relocation entry
|
|
* in the PLT relocation table.
|
|
*
|
|
* We are careful to preserve all registers, even the the caller-save
|
|
* registers. That is because this code may be invoked by low-level
|
|
* assembly-language code that is not ABI-compliant.
|
|
*/
|
|
.align 4
|
|
.globl _rtld_bind_start
|
|
.type _rtld_bind_start,@function
|
|
_rtld_bind_start:
|
|
pushf # Save eflags
|
|
pushl %eax # Save %eax
|
|
pushl %edx # Save %edx
|
|
pushl %ecx # Save %ecx
|
|
pushl 20(%esp) # Copy reloff argument
|
|
pushl 20(%esp) # Copy obj argument
|
|
|
|
call _rtld_bind@PLT # Transfer control to the binder
|
|
/* Now %eax contains the entry point of the function being called. */
|
|
|
|
addl $8,%esp # Discard binder arguments
|
|
movl %eax,20(%esp) # Store target over obj argument
|
|
popl %ecx # Restore %ecx
|
|
popl %edx # Restore %edx
|
|
popl %eax # Restore %eax
|
|
popf # Restore eflags
|
|
leal 4(%esp),%esp # Discard reloff, do not change eflags
|
|
ret # "Return" to target address
|