mirror of https://github.com/ipxe/ipxe.git
146 lines
3.7 KiB
C
146 lines
3.7 KiB
C
/*
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* Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <errno.h>
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#include <elf.h>
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#include <ipxe/image.h>
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#include <ipxe/elf.h>
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#include <ipxe/features.h>
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#include <ipxe/init.h>
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/**
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* @file
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*
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* ELF bootable image
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*
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*/
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FEATURE ( FEATURE_IMAGE, "ELF", DHCP_EB_FEATURE_ELF, 1 );
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/**
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* Execute ELF image
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*
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* @v image ELF image
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* @ret rc Return status code
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*/
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static int elfboot_exec ( struct image *image ) {
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physaddr_t entry;
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physaddr_t max;
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int rc;
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/* Load the image using core ELF support */
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if ( ( rc = elf_load ( image, &entry, &max ) ) != 0 ) {
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DBGC ( image, "ELF %p could not load: %s\n",
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image, strerror ( rc ) );
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return rc;
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}
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/* An ELF image has no callback interface, so we need to shut
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* down before invoking it.
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*/
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shutdown_boot();
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/* Jump to OS with flat physical addressing */
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DBGC ( image, "ELF %p starting execution at %lx\n", image, entry );
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__asm__ __volatile__ ( PHYS_CODE ( "pushl %%ebp\n\t" /* gcc bug */
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"call *%%edi\n\t"
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"popl %%ebp\n\t" /* gcc bug */ )
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: : "D" ( entry )
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: "eax", "ebx", "ecx", "edx", "esi", "memory" );
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DBGC ( image, "ELF %p returned\n", image );
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/* It isn't safe to continue after calling shutdown() */
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while ( 1 ) {}
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return -ECANCELED; /* -EIMPOSSIBLE, anyone? */
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}
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/**
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* Check that ELF segment uses flat physical addressing
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*
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* @v image ELF file
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* @v phdr ELF program header
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* @v dest Destination address
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* @ret rc Return status code
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*/
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static int elfboot_check_segment ( struct image *image, Elf_Phdr *phdr,
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physaddr_t dest ) {
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/* Check that ELF segment uses flat physical addressing */
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if ( phdr->p_vaddr != dest ) {
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DBGC ( image, "ELF %p uses virtual addressing (phys %x, "
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"virt %x)\n", image, phdr->p_paddr, phdr->p_vaddr );
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return -ENOEXEC;
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}
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return 0;
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}
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/**
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* Probe ELF image
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*
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* @v image ELF file
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* @ret rc Return status code
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*/
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static int elfboot_probe ( struct image *image ) {
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Elf32_Ehdr ehdr;
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static const uint8_t e_ident[] = {
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[EI_MAG0] = ELFMAG0,
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[EI_MAG1] = ELFMAG1,
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[EI_MAG2] = ELFMAG2,
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[EI_MAG3] = ELFMAG3,
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[EI_CLASS] = ELFCLASS32,
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[EI_DATA] = ELFDATA2LSB,
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[EI_VERSION] = EV_CURRENT,
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};
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physaddr_t entry;
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physaddr_t max;
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int rc;
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/* Read ELF header */
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copy_from_user ( &ehdr, image->data, 0, sizeof ( ehdr ) );
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if ( memcmp ( ehdr.e_ident, e_ident, sizeof ( e_ident ) ) != 0 ) {
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DBGC ( image, "Invalid ELF identifier\n" );
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return -ENOEXEC;
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}
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/* Check that this image uses flat physical addressing */
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if ( ( rc = elf_segments ( image, &ehdr, elfboot_check_segment,
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&entry, &max ) ) != 0 ) {
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DBGC ( image, "Unloadable ELF image\n" );
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return rc;
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}
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return 0;
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}
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/** ELF image type */
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struct image_type elfboot_image_type __image_type ( PROBE_NORMAL ) = {
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.name = "ELF",
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.probe = elfboot_probe,
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.exec = elfboot_exec,
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};
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