From 84b464bb23734b1d2dbaa4eada95d1282ff664ae Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Mon, 5 Jul 2010 17:18:11 +0200
Subject: [PATCH] Box: Let 32-/64-bit mode be configurable

---
 box/Makefile         | 7 +++++--
 box/box.c            | 2 ++
 box/mk-syscall-table | 1 +
 default.cfg          | 5 +++++
 4 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/box/Makefile b/box/Makefile
index b44fe3a..c5d6b2a 100644
--- a/box/Makefile
+++ b/box/Makefile
@@ -4,7 +4,10 @@
 DIRS+=box
 PROGS+=$(o)/box/box
 
-BOX_CFLAGS=-m64 -DCONFIG_BOX_KERNEL_AMD64 #-DCONFIG_BOX_USER_AMD64
+BOX_CFLAGS=
+ifdef CONFIG_BOX_KERNEL_AMD64
+BOX_CFLAGS += -m64
+endif
 
 $(o)/box/box: $(o)/box/box.o
 $(o)/box/box.o: $(o)/box/syscall-table.h
@@ -13,7 +16,7 @@ $(o)/box/box: LDFLAGS+=$(BOX_CFLAGS)
 $(o)/box/box.o: CFLAGS+=$(BOX_CFLAGS)
 
 $(o)/box/syscall-table.h: $(s)/box/mk-syscall-table
-	sh $^ >$@ $(BOX_CFLAGS)
+	sh $^ >$@ $(CFLAGS) $(BOX_CFLAGS)
 
 box-tests: $(addprefix $(o)/box/test-sys,32-int80 64-int80 32-syscall 64-syscall 32-sysenter 64-sysenter)
 
diff --git a/box/box.c b/box/box.c
index fb62376..0788ac4 100644
--- a/box/box.c
+++ b/box/box.c
@@ -7,6 +7,8 @@
 #define _LARGEFILE64_SOURCE
 #define _GNU_SOURCE
 
+#include "autoconf.h"
+
 #include <errno.h>
 #include <stdio.h>
 #include <fcntl.h>
diff --git a/box/mk-syscall-table b/box/mk-syscall-table
index ec16571..2439805 100755
--- a/box/mk-syscall-table
+++ b/box/mk-syscall-table
@@ -3,6 +3,7 @@ set -e
 echo '/* Syscall table automatically generated by mk-syscall-table */'
 echo
 cat <<FOE |
+#include "autoconf.h"
 #if defined(CONFIG_BOX_KERNEL_AMD64) && !defined(CONFIG_BOX_USER_AMD64)
 #include <asm/unistd_32.h>
 #else
diff --git a/default.cfg b/default.cfg
index 6e35e17..7df0978 100644
--- a/default.cfg
+++ b/default.cfg
@@ -6,6 +6,11 @@ Set("CONFIG_SUBMIT" => 1);
 # Build MO-P contest environment
 Set("CONFIG_MOP" => 1);
 
+# If you are running a 64-bit Linux kernel, you need to build a 64-bit
+# sandbox and decide whether your userspace is 32- or 64-bit.
+Set("CONFIG_BOX_KERNEL_AMD64" => 1);
+#Set("CONFIG_BOX_USER_AMD64" => 1);
+
 # Settings of libucw
 UnSet("CONFIG_SHARED");
 UnSet("CONFIG_UCW_THREADS");
-- 
2.39.2