| /* |
| * 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 |
| pushl %eax |
| |
| /* Put the run address in %eax */ |
| movl 8(%ebp), %eax |
| |
| /* Save off the rest of the registers */ |
| |
| pushl %esi |
| pushl %ecx |
| pushl %ebp |
| |
| /* Push the argc and argv pointers on to the stack */ |
| |
| movl 12(%ebp), %esi |
| movl 16(%ebp), %ecx |
| |
| pushl %esi |
| pushl %ecx |
| |
| /* Move a "magic" number on the stack - the other |
| * payload will use this as a clue that the argc |
| * and argv are sane |
| */ |
| |
| movl $12345678, %ecx |
| pushl %ecx |
| |
| /* Jump to the code */ |
| call *%eax |
| |
| /* %eax has the return value */ |
| |
| /* Skip over the argc/argv stuff still on the stack */ |
| addl $12, %esp |
| |
| /* Get back %ebp */ |
| popl %ebp |
| |
| /* Get the pointer to the return value |
| * and save the return value in it |
| */ |
| |
| movl 20(%ebp), %ecx |
| movl %eax, (%eax) |
| |
| /* Get the rest of the saved registers */ |
| popl %ecx |
| popl %esi |
| popl %eax |
| |
| /* Restore the stack pointer */ |
| movl %ebp,%esp |
| popl %ebp |
| ret |
| |
