85 lines
2.6 KiB
ArmAsm
85 lines
2.6 KiB
ArmAsm
/*
|
|
* This file is part of the libpayload project.
|
|
*
|
|
* Copyright (C) 2008 Advanced Micro Devices, Inc.
|
|
*
|
|
* 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. 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 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 AUTHOR 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.
|
|
*/
|
|
|
|
/* calling syntax: i386_do_exec(long addr, int argc, char **argv, int *ret) */
|
|
|
|
/* This implements the payload API detailed here:
|
|
* http://www.coreboot.org/Payload_API
|
|
*/
|
|
|
|
.align 4
|
|
.text
|
|
|
|
.global i386_do_exec
|
|
.type i386_do_exec,@function
|
|
|
|
i386_do_exec:
|
|
pushl %ebp
|
|
movl %esp, %ebp
|
|
|
|
/* Save the remaining callee preserved registers */
|
|
pushl %ebx
|
|
pushl %esi
|
|
pushl %edi
|
|
|
|
/* Push argc and argv on to the stack.
|
|
*
|
|
* We need to put a dummy value inbetween, as argc should be at offset
|
|
* 0x10, according to the payload API.
|
|
*/
|
|
pushl 12(%ebp)
|
|
pushl $0
|
|
pushl 16(%ebp)
|
|
|
|
/* Push a "magic" number on the stack - the other payload will use this
|
|
* as a clue that the argc and argv values on the stack are sane.
|
|
*/
|
|
pushl $0x12345678
|
|
|
|
/* Jump to the code */
|
|
call *8(%ebp)
|
|
/* %eax has the return value */
|
|
|
|
/* Skip over the argc/argv stuff still on the stack.
|
|
* Don't assume %ebp is sane, here. Restore it from the stack.
|
|
*/
|
|
addl $0x10, %esp
|
|
|
|
/* Restore the saved registers */
|
|
popl %edi
|
|
popl %esi
|
|
popl %ebx
|
|
popl %ebp
|
|
|
|
/* Get pointer to return value and save the return value in it. */
|
|
movl 16(%esp), %ecx
|
|
movl %eax, (%ecx)
|
|
|
|
ret
|