diff options
Diffstat (limited to 'gpxe/src/image/elf.c')
| -rw-r--r-- | gpxe/src/image/elf.c | 162 |
1 files changed, 0 insertions, 162 deletions
diff --git a/gpxe/src/image/elf.c b/gpxe/src/image/elf.c deleted file mode 100644 index a0ec065e..00000000 --- a/gpxe/src/image/elf.c +++ /dev/null @@ -1,162 +0,0 @@ -/* - * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of the - * License, or any later version. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -FILE_LICENCE ( GPL2_OR_LATER ); - -/** - * @file - * - * ELF image format - * - * A "pure" ELF image is not a bootable image. There are various - * bootable formats based upon ELF (e.g. Multiboot), which share - * common ELF-related functionality. - */ - -#include <errno.h> -#include <elf.h> -#include <gpxe/uaccess.h> -#include <gpxe/segment.h> -#include <gpxe/image.h> -#include <gpxe/elf.h> - -typedef Elf32_Ehdr Elf_Ehdr; -typedef Elf32_Phdr Elf_Phdr; -typedef Elf32_Off Elf_Off; - -/** - * Load ELF segment into memory - * - * @v image ELF file - * @v phdr ELF program header - * @v ehdr ELF executable header - * @ret rc Return status code - */ -static int elf_load_segment ( struct image *image, Elf_Phdr *phdr, - Elf_Ehdr *ehdr ) { - physaddr_t dest; - userptr_t buffer; - unsigned long e_offset; - int rc; - - /* Do nothing for non-PT_LOAD segments */ - if ( phdr->p_type != PT_LOAD ) - return 0; - - /* Check segment lies within image */ - if ( ( phdr->p_offset + phdr->p_filesz ) > image->len ) { - DBGC ( image, "ELF %p segment outside image\n", image ); - return -ENOEXEC; - } - - /* Find start address: use physical address for preference, - * fall back to virtual address if no physical address - * supplied. - */ - dest = phdr->p_paddr; - if ( ! dest ) - dest = phdr->p_vaddr; - if ( ! dest ) { - DBGC ( image, "ELF %p segment loads to physical address 0\n", - image ); - return -ENOEXEC; - } - buffer = phys_to_user ( dest ); - - DBGC ( image, "ELF %p loading segment [%x,%x) to [%x,%x,%x)\n", image, - phdr->p_offset, ( phdr->p_offset + phdr->p_filesz ), - phdr->p_paddr, ( phdr->p_paddr + phdr->p_filesz ), - ( phdr->p_paddr + phdr->p_memsz ) ); - - /* Verify and prepare segment */ - if ( ( rc = prep_segment ( buffer, phdr->p_filesz, - phdr->p_memsz ) ) != 0 ) { - DBGC ( image, "ELF %p could not prepare segment: %s\n", - image, strerror ( rc ) ); - return rc; - } - - /* Copy image to segment */ - memcpy_user ( buffer, 0, image->data, phdr->p_offset, phdr->p_filesz ); - - /* Set execution address, if it lies within this segment */ - if ( ( e_offset = ( ehdr->e_entry - dest ) ) < phdr->p_filesz ) { - image->priv.phys = ehdr->e_entry; - DBGC ( image, "ELF %p found physical entry point at %lx\n", - image, image->priv.phys ); - } else if ( ( e_offset = ( ehdr->e_entry - phdr->p_vaddr ) ) - < phdr->p_filesz ) { - if ( ! image->priv.phys ) { - image->priv.phys = ( dest + e_offset ); - DBGC ( image, "ELF %p found virtual entry point at %lx" - " (virt %lx)\n", image, image->priv.phys, - ( ( unsigned long ) ehdr->e_entry ) ); - } - } - - return 0; -} - -/** - * Load ELF image into memory - * - * @v image ELF file - * @ret rc Return status code - */ -int elf_load ( struct image *image ) { - Elf_Ehdr ehdr; - Elf_Phdr phdr; - Elf_Off phoff; - unsigned int phnum; - int rc; - - /* Image type must already have been set by caller */ - assert ( image->type != NULL ); - - /* Read ELF header */ - copy_from_user ( &ehdr, image->data, 0, sizeof ( ehdr ) ); - if ( memcmp ( &ehdr.e_ident[EI_MAG0], ELFMAG, SELFMAG ) != 0 ) { - DBGC ( image, "ELF %p has invalid signature\n", image ); - return -ENOEXEC; - } - - /* Invalidate execution address */ - image->priv.phys = 0; - - /* Read ELF program headers */ - for ( phoff = ehdr.e_phoff , phnum = ehdr.e_phnum ; phnum ; - phoff += ehdr.e_phentsize, phnum-- ) { - if ( phoff > image->len ) { - DBGC ( image, "ELF %p program header %d outside " - "image\n", image, phnum ); - return -ENOEXEC; - } - copy_from_user ( &phdr, image->data, phoff, sizeof ( phdr ) ); - if ( ( rc = elf_load_segment ( image, &phdr, &ehdr ) ) != 0 ) - return rc; - } - - /* Check for a valid execution address */ - if ( ! image->priv.phys ) { - DBGC ( image, "ELF %p entry point %lx outside image\n", - image, ( ( unsigned long ) ehdr.e_entry ) ); - return -ENOEXEC; - } - - return 0; -} |