Added kernel_debugger command for entering the kernel debugger.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@31966 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/bin/debug/Jamfile

@@ -7,6 +7,12 @@ UsePrivateSystemHeaders ;
 
 StaticLibrary <bin>debug_utils.a : debug_utils.cpp ;
 
+BinCommand kernel_debugger : kernel_debugger.cpp
+	:
+	$(TARGET_LIBSUPC++)
+;
+
+
 HaikuSubInclude ltrace ;
 HaikuSubInclude profile ;
 HaikuSubInclude scheduling_recorder ;

src/bin/debug/kernel_debugger.cpp

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2009, Ingo Weinhold, ingo_weinhold@gmx.de.
+ * Distributed under the terms of the MIT License.
+ */
+
+
+#include <stdio.h>
+#include <string.h>
+
+
+#include <syscalls.h>
+
+
+extern const char* __progname;
+
+static const char* const kUsage =
+	"Usage: %s [ <message> ]\n"
+	"Enters the kernel debugger with the optional message.\n";
+
+
+int
+main(int argc, const char* const* argv)
+{
+	const char* message = "User command requested kernel debugger.";
+
+	if (argc > 1) {
+		if (strcmp(argv[1], "-h") == 0 || strcmp(argv[1], "--help") == 0) {
+			printf(kUsage, __progname);
+			return 0;
+		}
+
+		message = argv[1];
+	}
+
+	status_t error = _kern_kernel_debugger(message);
+	if (error != B_OK) {
+		fprintf(stderr, "Error: Entering the kernel debugger failed: %s\n",
+			strerror(error));
+		return 1;
+	}
+
+	return 0;
+}