From: Ross Lagerwall <ross.lagerwall@citrix.com>
Date: Tue, 20 Oct 2015 11:12:16 +0000 (+0100)
Subject: Add space for reverting the each applied function
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=639c478f84c495292b071aab9391c20b62c20839;p=livepatch-build-tools.git

Add space for reverting the each applied function

Add an undo buffer to each xsplice_patch_func object to making reverting
functions easy.
---

diff --git a/create-diff-object.c b/create-diff-object.c
index 5064881..fe185c1 100644
--- a/create-diff-object.c
+++ b/create-diff-object.c
@@ -160,6 +160,7 @@ struct xsplice_patch_func {
 	unsigned long old_addr;
 	unsigned long old_size;
 	char *name;
+	unsigned char undo[8];
 };
 
 struct special_section {
@@ -2000,6 +2001,7 @@ void xsplice_create_patches_sections(struct xsplice_elf *kelf,
 			funcs[index].old_size = result.size;
 			funcs[index].new_addr = 0;
 			funcs[index].new_size = sym->sym.st_size;
+			memset(funcs[index].undo, 0, sizeof funcs[index].undo);
 
 			/*
 			 * Add a relocation that will populate