1 files changed, 113 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/gpxe/src/arch/i386/image/elfboot.c b/contrib/syslinux-4.02/gpxe/src/arch/i386/image/elfboot.c
new file mode 100644
index 0000000..a41040e
--- /dev/null
+++ b/contrib/syslinux-4.02/gpxe/src/arch/i386/image/elfboot.c
@@ -0,0 +1,113 @@
+/*
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <errno.h>
+#include <elf.h>
+#include <gpxe/image.h>
+#include <gpxe/elf.h>
+#include <gpxe/features.h>
+#include <gpxe/init.h>
+
+/**
+ * @file
+ *
+ * ELF bootable image
+ *
+ */
+
+FEATURE ( FEATURE_IMAGE, "ELF", DHCP_EB_FEATURE_ELF, 1 );
+
+struct image_type elfboot_image_type __image_type ( PROBE_NORMAL );
+
+/**
+ * Execute ELF image
+ *
+ * @v image		ELF image
+ * @ret rc		Return status code
+ */
+static int elfboot_exec ( struct image *image ) {
+	physaddr_t entry = image->priv.phys;
+
+	/* An ELF image has no callback interface, so we need to shut
+	 * down before invoking it.
+	 */
+	shutdown ( SHUTDOWN_BOOT );
+
+	/* Jump to OS with flat physical addressing */
+	DBGC ( image, "ELF %p starting execution at %lx\n", image, entry );
+	__asm__ __volatile__ ( PHYS_CODE ( "call *%%edi\n\t" )
+			       : : "D" ( entry )
+			       : "eax", "ebx", "ecx", "edx", "esi", "ebp",
+			         "memory" );
+
+	DBGC ( image, "ELF %p returned\n", image );
+
+	/* It isn't safe to continue after calling shutdown() */
+	while ( 1 ) {}
+
+	return -ECANCELED;  /* -EIMPOSSIBLE, anyone? */
+}
+
+/**
+ * Load ELF image into memory
+ *
+ * @v image		ELF file
+ * @ret rc		Return status code
+ */
+static int elfboot_load ( 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,
+	};
+	int rc;
+
+	/* 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;
+	}
+
+	/* This is an ELF image, valid or otherwise */
+	if ( ! image->type )
+		image->type = &elfboot_image_type;
+
+	/* Load the image using core ELF support */
+	if ( ( rc = elf_load ( image ) ) != 0 ) {
+		DBGC ( image, "ELF %p could not load: %s\n",
+		       image, strerror ( rc ) );
+		return rc;
+	}
+
+	return 0;
+}
+
+/** ELF image type */
+struct image_type elfboot_image_type __image_type ( PROBE_NORMAL ) = {
+	.name = "ELF",
+	.load = elfboot_load,
+	.exec = elfboot_exec,
+};