Replace image->entry with image->priv.

src/arch/i386/image/multiboot.c

  * @ret rc		Return status code
  */
 static int multiboot_exec ( struct image *image ) {
+	physaddr_t entry = image->priv.phys;
 
 	/* Populate multiboot information structure */
 	memset ( &mbinfo, 0, sizeof ( mbinfo ) );
 	__asm__ __volatile__ ( PHYS_CODE ( "call *%%edi\n\t" )
 			       : : "a" ( MULTIBOOT_BOOTLOADER_MAGIC ),
 			           "b" ( virt_to_phys ( &mbinfo ) ),
-			           "D" ( image->entry )
+			           "D" ( entry )
 			       : "ecx", "edx", "esi", "ebp", "memory" );
 
 	DBGC ( image, "MULTIBOOT %p returned\n", image );
 	/* Copy image to segment */
 	memcpy_user ( buffer, 0, image->data, offset, filesz );
 
-	/* Record execution entry point */
-	image->entry = hdr->mb.entry_addr;
+	/* Record execution entry point in image private data field */
+	image->priv.phys = hdr->mb.entry_addr;
 
 	return 0;
 }

src/arch/i386/image/nbi.c

 					   nbi_load_segment ) ) != 0 )
 		return rc;
 
+	/* Record header address in image private data field */
+	image->priv.user = real_to_user ( imgheader.location.segment,
+					  imgheader.location.offset );
+
 	return 0;
 }
 
 static int nbi_exec ( struct image *image ) {
 	struct imgheader imgheader;
 
-	copy_from_user ( &imgheader, phys_to_user ( image->entry ), 0,
+	copy_from_user ( &imgheader, image->priv.user, 0,
 			 sizeof ( imgheader ) );
 
 	if ( NBI_LINEAR_EXEC_ADDR ( imgheader.flags ) ) {

src/image/elf.c

 			return rc;
 	}
 
-	/* Fill in entry point address */
-	image->entry = ehdr.e_entry;
+	/* Record execution entry point in image private data field */
+	image->priv.phys = ehdr.e_entry;
 
 	return 0;
 }

src/include/gpxe/image.h

 
 	/** Image type, if known */
 	struct image_type *type;
-	/** Entry point */
-	physaddr_t entry;
+	/** Image type private data */
+	union {
+		physaddr_t phys;
+		userptr_t user;
+	} priv;
 };
 
 /** Image is loaded */