# --- T2-COPYRIGHT-BEGIN ---
# t2/package/*/arcload/elf32-netboot.patch
# Copyright (C) 2020 - 2026 The T2 SDE Project
# SPDX-License-Identifier: GPL-2.0 or patched project license
# --- T2-COPYRIGHT-END ---

Fix loading 32-bit kernel on 32-bit Arcs over bootp / tftp on earlier Sgi
machines, like the precious and famous O2.

Signed-off-by: René Rebe <rene@exactcode.de>

--- arcload-0.5-patched/loader/main.c.vanilla	2020-08-28 21:38:30.189076493 +0200
+++ arcload-0.5-patched/loader/main.c	2020-08-30 14:42:32.672622589 +0200
@@ -325,7 +325,7 @@
 	printf("Loading %s...\n\r", fname);
 
 	/* Read ELF Header */
-	if(bread(&file, sizeof(hdr), &hdr)<0) {
+	if(bread(&file, sizeof(hdr.e_ident), &hdr)<0) {
 		printf("Error reading ELF header.\n\r");
 		goto close;
 	}
@@ -346,6 +346,14 @@
 		goto close;
 	}
 
+	/* read the rest of the header */
+	if(bread(&file, (hdr.e_ident[EI_CLASS] == ELFCLASS64 ?
+		 sizeof(Elf64_Ehdr) : sizeof(Elf32_Ehdr)) - EI_NIDENT,
+		 &hdr.e_ident[EI_NIDENT]) < 0) {
+		printf("Error reading remaining ELF header.\n\r");
+		return 0;
+	}
+
 	/* 32 or 64 bit? */
 	if(hdr.e_ident[EI_CLASS] == ELFCLASS64) {
 		kentry = load_elf64(&hdr.e64, &file);