2 * Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 * You can also choose to distribute this program under the terms of
20 * the Unmodified Binary Distribution Licence (as given in the file
21 * COPYING.UBDL), provided that you have satisfied its requirements.
24 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
28 #include <ipxe/image.h>
30 #include <ipxe/features.h>
31 #include <ipxe/init.h>
40 FEATURE ( FEATURE_IMAGE, "ELF", DHCP_EB_FEATURE_ELF, 1 );
46 * @ret rc Return status code
48 static int elfboot_exec ( struct image *image ) {
53 /* Load the image using core ELF support */
54 if ( ( rc = elf_load ( image, &entry, &max ) ) != 0 ) {
55 DBGC ( image, "ELF %p could not load: %s\n",
56 image, strerror ( rc ) );
60 /* An ELF image has no callback interface, so we need to shut
61 * down before invoking it.
65 /* Jump to OS with flat physical addressing */
66 DBGC ( image, "ELF %p starting execution at %lx\n", image, entry );
67 __asm__ __volatile__ ( PHYS_CODE ( "pushl %%ebp\n\t" /* gcc bug */
69 "popl %%ebp\n\t" /* gcc bug */ )
71 : "eax", "ebx", "ecx", "edx", "esi", "memory" );
73 DBGC ( image, "ELF %p returned\n", image );
75 /* It isn't safe to continue after calling shutdown() */
78 return -ECANCELED; /* -EIMPOSSIBLE, anyone? */
82 * Check that ELF segment uses flat physical addressing
85 * @v phdr ELF program header
86 * @v dest Destination address
87 * @ret rc Return status code
89 static int elfboot_check_segment ( struct image *image, Elf_Phdr *phdr,
92 /* Check that ELF segment uses flat physical addressing */
93 if ( phdr->p_vaddr != dest ) {
94 DBGC ( image, "ELF %p uses virtual addressing (phys %x, "
95 "virt %x)\n", image, phdr->p_paddr, phdr->p_vaddr );
106 * @ret rc Return status code
108 static int elfboot_probe ( struct image *image ) {
110 static const uint8_t e_ident[] = {
115 [EI_CLASS] = ELFCLASS32,
116 [EI_DATA] = ELFDATA2LSB,
117 [EI_VERSION] = EV_CURRENT,
123 /* Read ELF header */
124 copy_from_user ( &ehdr, image->data, 0, sizeof ( ehdr ) );
125 if ( memcmp ( ehdr.e_ident, e_ident, sizeof ( e_ident ) ) != 0 ) {
126 DBGC ( image, "Invalid ELF identifier\n" );
130 /* Check that this image uses flat physical addressing */
131 if ( ( rc = elf_segments ( image, &ehdr, elfboot_check_segment,
132 &entry, &max ) ) != 0 ) {
133 DBGC ( image, "Unloadable ELF image\n" );
140 /** ELF image type */
141 struct image_type elfboot_image_type __image_type ( PROBE_NORMAL ) = {
143 .probe = elfboot_probe,
144 .exec = elfboot_exec,