diff options
author | Yang Zhang <yang.z.zhang@intel.com> | 2015-08-28 09:58:54 +0800 |
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committer | Yang Zhang <yang.z.zhang@intel.com> | 2015-09-01 12:44:00 +0800 |
commit | e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb (patch) | |
tree | 66b09f592c55df2878107a468a91d21506104d3f /qemu/roms/ipxe/src/arch/i386/image/elfboot.c | |
parent | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (diff) |
Add qemu 2.4.0
Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Diffstat (limited to 'qemu/roms/ipxe/src/arch/i386/image/elfboot.c')
-rw-r--r-- | qemu/roms/ipxe/src/arch/i386/image/elfboot.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/qemu/roms/ipxe/src/arch/i386/image/elfboot.c b/qemu/roms/ipxe/src/arch/i386/image/elfboot.c new file mode 100644 index 000000000..0f6957f02 --- /dev/null +++ b/qemu/roms/ipxe/src/arch/i386/image/elfboot.c @@ -0,0 +1,110 @@ +/* + * Copyright (C) 2008 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., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +FILE_LICENCE ( GPL2_OR_LATER ); + +#include <errno.h> +#include <elf.h> +#include <ipxe/image.h> +#include <ipxe/elf.h> +#include <ipxe/features.h> +#include <ipxe/init.h> + +/** + * @file + * + * ELF bootable image + * + */ + +FEATURE ( FEATURE_IMAGE, "ELF", DHCP_EB_FEATURE_ELF, 1 ); + +/** + * Execute ELF image + * + * @v image ELF image + * @ret rc Return status code + */ +static int elfboot_exec ( struct image *image ) { + physaddr_t entry; + physaddr_t max; + int rc; + + /* Load the image using core ELF support */ + if ( ( rc = elf_load ( image, &entry, &max ) ) != 0 ) { + DBGC ( image, "ELF %p could not load: %s\n", + image, strerror ( rc ) ); + return rc; + } + + /* An ELF image has no callback interface, so we need to shut + * down before invoking it. + */ + shutdown_boot(); + + /* Jump to OS with flat physical addressing */ + DBGC ( image, "ELF %p starting execution at %lx\n", image, entry ); + __asm__ __volatile__ ( PHYS_CODE ( "pushl %%ebp\n\t" /* gcc bug */ + "call *%%edi\n\t" + "popl %%ebp\n\t" /* gcc bug */ ) + : : "D" ( entry ) + : "eax", "ebx", "ecx", "edx", "esi", "memory" ); + + DBGC ( image, "ELF %p returned\n", image ); + + /* It isn't safe to continue after calling shutdown() */ + while ( 1 ) {} + + return -ECANCELED; /* -EIMPOSSIBLE, anyone? */ +} + +/** + * Probe ELF image + * + * @v image ELF file + * @ret rc Return status code + */ +static int elfboot_probe ( struct image *image ) { + Elf32_Ehdr ehdr; + static const uint8_t e_ident[] = { + [EI_MAG0] = ELFMAG0, + [EI_MAG1] = ELFMAG1, + [EI_MAG2] = ELFMAG2, + [EI_MAG3] = ELFMAG3, + [EI_CLASS] = ELFCLASS32, + [EI_DATA] = ELFDATA2LSB, + [EI_VERSION] = EV_CURRENT, + }; + + /* Read ELF header */ + copy_from_user ( &ehdr, image->data, 0, sizeof ( ehdr ) ); + if ( memcmp ( ehdr.e_ident, e_ident, sizeof ( e_ident ) ) != 0 ) { + DBG ( "Invalid ELF identifier\n" ); + return -ENOEXEC; + } + + return 0; +} + +/** ELF image type */ +struct image_type elfboot_image_type __image_type ( PROBE_NORMAL ) = { + .name = "ELF", + .probe = elfboot_probe, + .exec = elfboot_exec, +}; |