Mac x86_64: Mach exception support

src/trusted/service_runtime/osx/mach_thread_map.c

+/*
+ * Copyright (c) 2013 The Native Client Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "native_client/src/trusted/service_runtime/osx/mach_thread_map.h"
+
+#include <pthread.h>
+
+#include "native_client/src/shared/platform/nacl_check.h"
+#include "native_client/src/trusted/service_runtime/arch/sel_ldr_arch.h"
+#include "native_client/src/trusted/service_runtime/nacl_globals.h"
+
+#if NACL_ARCH(NACL_BUILD_ARCH) == NACL_x86 && NACL_BUILD_SUBARCH == 64
+
+static mach_port_t mach_threads[NACL_THREAD_MAX];
+
+uint32_t NaClGetThreadIndexForMachThread(mach_port_t mach_thread) {
+  uint32_t nacl_thread_index;
+
+  DCHECK(mach_thread != MACH_PORT_NULL);
+
+  CHECK(NACL_TLS_INDEX_INVALID < NACL_THREAD_MAX);  /* Skip the invalid slot. */
+  for (nacl_thread_index = NACL_TLS_INDEX_INVALID + 1;
+       nacl_thread_index < NACL_THREAD_MAX;
+       ++nacl_thread_index) {
+    if (mach_threads[nacl_thread_index] == mach_thread) {
+      break;
+    }
+  }
+
+  return nacl_thread_index == NACL_THREAD_MAX ? NACL_TLS_INDEX_INVALID :
+                                                nacl_thread_index;
+}
+
+void NaClSetCurrentMachThreadForThreadIndex(uint32_t nacl_thread_index) {
+  mach_port_t mach_thread = pthread_mach_thread_np(pthread_self());
+  CHECK(mach_thread != MACH_PORT_NULL);
+
+  DCHECK(nacl_thread_index > NACL_TLS_INDEX_INVALID &&
+         nacl_thread_index < NACL_THREAD_MAX);
+  DCHECK(mach_threads[nacl_thread_index] == MACH_PORT_NULL);
+  DCHECK(NaClGetThreadIndexForMachThread(mach_thread) ==
+         NACL_TLS_INDEX_INVALID);
+
+  mach_threads[nacl_thread_index] = mach_thread;
+}
+
+void NaClClearMachThreadForThreadIndex(uint32_t nacl_thread_index) {
+  DCHECK(nacl_thread_index > NACL_TLS_INDEX_INVALID &&
+         nacl_thread_index < NACL_THREAD_MAX);
+  DCHECK(mach_threads[nacl_thread_index] ==
+         pthread_mach_thread_np(pthread_self()));
+
+  mach_threads[nacl_thread_index] = MACH_PORT_NULL;
+}
+
+#endif