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Annotation of qemu/roms/ipxe/src/arch/i386/image/elfboot.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (C) 2008 Michael Brown <[email protected]>.
                      3:  *
                      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.
                      8:  *
                      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.
                     13:  *
                     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., 675 Mass Ave, Cambridge, MA 02139, USA.
                     17:  */
                     18: 
                     19: FILE_LICENCE ( GPL2_OR_LATER );
                     20: 
                     21: #include <errno.h>
                     22: #include <elf.h>
                     23: #include <ipxe/image.h>
                     24: #include <ipxe/elf.h>
                     25: #include <ipxe/features.h>
                     26: #include <ipxe/init.h>
                     27: 
                     28: /**
                     29:  * @file
                     30:  *
                     31:  * ELF bootable image
                     32:  *
                     33:  */
                     34: 
                     35: FEATURE ( FEATURE_IMAGE, "ELF", DHCP_EB_FEATURE_ELF, 1 );
                     36: 
                     37: /**
                     38:  * Execute ELF image
                     39:  *
                     40:  * @v image            ELF image
                     41:  * @ret rc             Return status code
                     42:  */
                     43: static int elfboot_exec ( struct image *image ) {
                     44:        physaddr_t entry;
                     45:        int rc;
                     46: 
                     47:        /* Load the image using core ELF support */
                     48:        if ( ( rc = elf_load ( image, &entry ) ) != 0 ) {
                     49:                DBGC ( image, "ELF %p could not load: %s\n",
                     50:                       image, strerror ( rc ) );
                     51:                return rc;
                     52:        }
                     53: 
                     54:        /* An ELF image has no callback interface, so we need to shut
                     55:         * down before invoking it.
                     56:         */
                     57:        shutdown_boot();
                     58: 
                     59:        /* Jump to OS with flat physical addressing */
                     60:        DBGC ( image, "ELF %p starting execution at %lx\n", image, entry );
                     61:        __asm__ __volatile__ ( PHYS_CODE ( "call *%%edi\n\t" )
                     62:                               : : "D" ( entry )
                     63:                               : "eax", "ebx", "ecx", "edx", "esi", "ebp",
                     64:                                 "memory" );
                     65: 
                     66:        DBGC ( image, "ELF %p returned\n", image );
                     67: 
                     68:        /* It isn't safe to continue after calling shutdown() */
                     69:        while ( 1 ) {}
                     70: 
                     71:        return -ECANCELED;  /* -EIMPOSSIBLE, anyone? */
                     72: }
                     73: 
                     74: /**
                     75:  * Probe ELF image
                     76:  *
                     77:  * @v image            ELF file
                     78:  * @ret rc             Return status code
                     79:  */
                     80: static int elfboot_probe ( struct image *image ) {
                     81:        Elf32_Ehdr ehdr;
                     82:        static const uint8_t e_ident[] = {
                     83:                [EI_MAG0]       = ELFMAG0,
                     84:                [EI_MAG1]       = ELFMAG1,
                     85:                [EI_MAG2]       = ELFMAG2,
                     86:                [EI_MAG3]       = ELFMAG3,
                     87:                [EI_CLASS]      = ELFCLASS32,
                     88:                [EI_DATA]       = ELFDATA2LSB,
                     89:                [EI_VERSION]    = EV_CURRENT,
                     90:        };
                     91: 
                     92:        /* Read ELF header */
                     93:        copy_from_user ( &ehdr, image->data, 0, sizeof ( ehdr ) );
                     94:        if ( memcmp ( ehdr.e_ident, e_ident, sizeof ( e_ident ) ) != 0 ) {
                     95:                DBG ( "Invalid ELF identifier\n" );
                     96:                return -ENOEXEC;
                     97:        }
                     98: 
                     99:        return 0;
                    100: }
                    101: 
                    102: /** ELF image type */
                    103: struct image_type elfboot_image_type __image_type ( PROBE_NORMAL ) = {
                    104:        .name = "ELF",
                    105:        .probe = elfboot_probe,
                    106:        .exec = elfboot_exec,
                    107: };

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