84 lines
2.6 KiB
ArmAsm
84 lines
2.6 KiB
ArmAsm
/*
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*
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* Copyright (C) 2008 Advanced Micro Devices, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* calling syntax: i386_do_exec(long addr, int argc, char **argv, int *ret) */
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/* This implements the payload API detailed here:
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* https://www.coreboot.org/Payload_API
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*/
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.align 4
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.text
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.global i386_do_exec
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.type i386_do_exec,@function
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i386_do_exec:
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pushl %ebp
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movl %esp, %ebp
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/* Save the remaining callee preserved registers */
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pushl %ebx
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pushl %esi
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pushl %edi
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/* Push argc and argv on to the stack.
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*
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* We need to put a dummy value inbetween, as argc should be at offset
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* 0x10, according to the payload API.
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*/
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pushl 12(%ebp)
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pushl $0
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pushl 16(%ebp)
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/* Push a "magic" number on the stack - the other payload will use this
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* as a clue that the argc and argv values on the stack are sane.
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*/
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pushl $0x12345678
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/* Jump to the code */
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call *8(%ebp)
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/* %eax has the return value */
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/* Skip over the argc/argv stuff still on the stack.
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* Don't assume %ebp is sane, here. Restore it from the stack.
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*/
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addl $0x10, %esp
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/* Restore the saved registers */
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popl %edi
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popl %esi
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popl %ebx
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popl %ebp
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/* Get pointer to return value and save the return value in it. */
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movl 16(%esp), %ecx
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movl %eax, (%ecx)
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ret
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