Fixes #18 -- call the kerne's BUG macro when we panic

Author: alex

build.rs

@@ -13,6 +13,7 @@ const INCLUDED_FUNCTIONS: &[&str] = &[
     "kfree",
     "mount_nodev",
     "kill_litter_super",
+    "BINDINGS_BUG",
 ];
 const INCLUDED_VARS: &[&str] = &[
     "EINVAL",

hello-world/Makefile

@@ -1,5 +1,5 @@
 obj-m := helloworld.o
-helloworld-objs := target/x86_64-linux-kernel-module/debug/libhello_world.a ../src/printk_helper.o
+helloworld-objs := target/x86_64-linux-kernel-module/debug/libhello_world.a ../src/helpers.o
 EXTRA_LDFLAGS += --gc-sections --entry=init_module --undefined=cleanup_module
 
 all:

src/helpers.c

@@ -0,0 +1,11 @@
+#include <linux/printk.h>
+
+int printk_helper(const unsigned char *s, int len)
+{
+    return printk(KERN_INFO "%.*s", len, (const char *)s);
+}
+
+void bug_helper()
+{
+    BUG();
+}

src/lib.rs

@@ -64,12 +64,18 @@ pub trait KernelModule: Sized {
     fn init() -> KernelResult<Self>;
 }
 
+extern "C" {
+    fn bug_helper() -> !;
+}
+
 #[lang = "eh_personality"]
 extern "C" fn eh_personality() {}
 
 #[lang = "panic_fmt"]
 extern "C" fn panic_fmt() -> ! {
-    loop {}
+    unsafe {
+        bug_helper();
+    }
 }
 
 #[global_allocator]

src/printk_helper.c

@@ -1,5 +1,5 @@
 obj-m := staticfilesystem.o
-staticfilesystem-objs := target/x86_64-linux-kernel-module/debug/libstatic_filesystem.a ../src/printk_helper.o
+staticfilesystem-objs := target/x86_64-linux-kernel-module/debug/libstatic_filesystem.a ../src/helpers.o
 EXTRA_LDFLAGS += --gc-sections --entry=init_module --undefined=cleanup_module
 
 all: