* files for more information.
*/
+#include "thread.h"
#include "sbcl.h"
#include "globals.h"
#include "runtime.h"
#include <signal.h>
-#include <ucontext.h>
#include <limits.h>
#include <mach-o/dyld.h>
-#include "bsd-os.h"
#include <errno.h>
+#include <dlfcn.h>
+
+#ifdef LISP_FEATURE_MACH_EXCEPTION_HANDLER
+#include <mach/mach.h>
+#endif
char *
-os_get_runtime_executable_path()
+os_get_runtime_executable_path(int external)
{
char path[PATH_MAX + 1];
- size_t size = sizeof(path);
+ uint32_t size = sizeof(path);
if (_NSGetExecutablePath(path, &size) == -1)
return NULL;
- else
- path[size] = '\0';
return copied_string(path);
}
+#ifdef LISP_FEATURE_MACH_EXCEPTION_HANDLER
+
+/* exc_server handles mach exception messages from the kernel and
+ * calls catch exception raise. We use the system-provided
+ * mach_msg_server, which, I assume, calls exc_server in a loop.
+ *
+ */
+extern boolean_t exc_server();
+
+void *
+mach_exception_handler(void *port)
+{
+ mach_msg_server(exc_server, 2048, (mach_port_t) port, 0);
+ /* mach_msg_server should never return, but it should dispatch mach
+ * exceptions to our catch_exception_raise function
+ */
+ lose("mach_msg_server returned");
+}
+
+/* Sets up the thread that will listen for mach exceptions. note that
+ the exception handlers will be run on this thread. This is
+ different from the BSD-style signal handling situation in which the
+ signal handlers run in the relevant thread directly. */
+
+mach_port_t mach_exception_handler_port_set = MACH_PORT_NULL;
+mach_port_t current_mach_task = MACH_PORT_NULL;
+
+pthread_t
+setup_mach_exception_handling_thread()
+{
+ kern_return_t ret;
+ pthread_t mach_exception_handling_thread = NULL;
+ pthread_attr_t attr;
+
+ current_mach_task = mach_task_self();
+
+ /* allocate a mach_port for this process */
+ ret = mach_port_allocate(current_mach_task,
+ MACH_PORT_RIGHT_PORT_SET,
+ &mach_exception_handler_port_set);
+
+ /* create the thread that will receive the mach exceptions */
+
+ FSHOW((stderr, "Creating mach_exception_handler thread!\n"));
+
+ pthread_attr_init(&attr);
+ pthread_create(&mach_exception_handling_thread,
+ &attr,
+ mach_exception_handler,
+ (void*) mach_exception_handler_port_set);
+ pthread_attr_destroy(&attr);
+
+ return mach_exception_handling_thread;
+}
+
+/* tell the kernel that we want EXC_BAD_ACCESS exceptions sent to the
+ exception port (which is being listened to do by the mach
+ exception handling thread). */
+kern_return_t
+mach_thread_init(mach_port_t thread_exception_port)
+{
+ kern_return_t ret;
+ mach_port_t current_mach_thread;
+
+ /* allocate a named port for the thread */
+ FSHOW((stderr, "Allocating mach port %x\n", thread_exception_port));
+ ret = mach_port_allocate_name(current_mach_task,
+ MACH_PORT_RIGHT_RECEIVE,
+ thread_exception_port);
+ if (ret) {
+ lose("mach_port_allocate_name failed with return_code %d\n", ret);
+ }
+
+ /* establish the right for the thread_exception_port to send messages */
+ ret = mach_port_insert_right(current_mach_task,
+ thread_exception_port,
+ thread_exception_port,
+ MACH_MSG_TYPE_MAKE_SEND);
+ if (ret) {
+ lose("mach_port_insert_right failed with return_code %d\n", ret);
+ }
+
+ current_mach_thread = mach_thread_self();
+ ret = thread_set_exception_ports(current_mach_thread,
+ EXC_MASK_BAD_ACCESS | EXC_MASK_BAD_INSTRUCTION,
+ thread_exception_port,
+ EXCEPTION_DEFAULT,
+ THREAD_STATE_NONE);
+ if (ret) {
+ lose("thread_set_exception_ports failed with return_code %d\n", ret);
+ }
+
+ ret = mach_port_deallocate (current_mach_task, current_mach_thread);
+ if (ret) {
+ lose("mach_port_deallocate failed with return_code %d\n", ret);
+ }
+
+ ret = mach_port_move_member(current_mach_task,
+ thread_exception_port,
+ mach_exception_handler_port_set);
+ if (ret) {
+ lose("mach_port_move_member failed with return_code %d\n", ret);
+ }
+
+ return ret;
+}
+
+void
+setup_mach_exceptions() {
+ setup_mach_exception_handling_thread();
+ mach_thread_init(THREAD_STRUCT_TO_EXCEPTION_PORT(all_threads));
+}
+
+pid_t
+mach_fork() {
+ pid_t pid = fork();
+ if (pid == 0) {
+ setup_mach_exceptions();
+ return pid;
+ } else {
+ return pid;
+ }
+}
+
+#endif
+