Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / ipxe / src / arch / i386 / image / elfboot.c

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 (file)
index 0000000..0f6957f
--- /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,
+};