| /* crt0-efi-ia32.S - x86 EFI startup code. |
| Copyright (C) 1999 Hewlett-Packard Co. |
| Contributed by David Mosberger <davidm@hpl.hp.com>. |
| |
| All rights reserved. |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions |
| are met: |
| |
| * Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| * 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. |
| * Neither the name of Hewlett-Packard Co. nor the names of its |
| contributors may be used to endorse or promote products derived |
| from this software without specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER OR CONTRIBUTORS |
| BE LIABLE FOR ANYDIRECT, 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. |
| */ |
| |
| .text |
| .align 4 |
| |
| .globl _start |
| _start: |
| pushl %ebp |
| movl %esp,%ebp |
| |
| pushl 12(%ebp) # copy "image" argument |
| pushl 8(%ebp) # copy "systab" argument |
| |
| call 0f |
| 0: popl %eax |
| movl %eax,%ebx |
| |
| addl $ImageBase-0b,%eax # %eax = ldbase |
| addl $_DYNAMIC-0b,%ebx # %ebx = _DYNAMIC |
| |
| pushl %ebx # pass _DYNAMIC as second argument |
| pushl %eax # pass ldbase as first argument |
| call _relocate |
| popl %ebx |
| popl %ebx |
| testl %eax,%eax |
| jne .exit |
| |
| call efi_main # call app with "image" and "systab" argument |
| |
| .exit: leave |
| ret |
| |
| // hand-craft a dummy .reloc section so EFI knows it's a relocatable executable: |
| |
| .data |
| dummy: .long 0 |
| |
| #define IMAGE_REL_ABSOLUTE 0 |
| .section .reloc |
| .long dummy // Page RVA |
| .long 10 // Block Size (2*4+2) |
| .word (IMAGE_REL_ABSOLUTE<<12) + 0 // reloc for dummy |
