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