Mac x86_64: Mach exception support

src/trusted/service_runtime/osx/mach_thread_map.h

+/*
+ * 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.
+ */
+
+#ifndef NATIVE_CLIENT_SERVICE_RUNTIME_OSX_MACH_THREAD_MAP_H_
+#define NATIVE_CLIENT_SERVICE_RUNTIME_OSX_MACH_THREAD_MAP_H_ 1
+
+#if NACL_OSX
+
+#include <mach/mach.h>
+#include <stdint.h>
+
+#include "native_client/src/include/nacl_base.h"
+#include "native_client/src/include/nacl_compiler_annotations.h"
+#include "native_client/src/trusted/service_runtime/nacl_tls.h"
+
+EXTERN_C_BEGIN
+
+#if NACL_ARCH(NACL_BUILD_ARCH) == NACL_x86 && NACL_BUILD_SUBARCH == 64
+
+/*
+ * Retrieves the Native Client thread index for a given Mach thread, or
+ * NACL_TLS_INDEX_INVALID if the Mach thread is unknown to Native Client.
+ */
+uint32_t NaClGetThreadIndexForMachThread(mach_port_t mach_thread);
+
+/*
+ * Establishes a mapping from the currently executing Mach thread to the
+ * given Native Client thread index.
+ */
+void NaClSetCurrentMachThreadForThreadIndex(uint32_t nacl_thread_index);
+
+/*
+ * Clears any existing mapping to any Mach thread for the given Native Client
+ * thread index. A thread's mapping must be cleared by itself, not by another
+ * thread.
+ */
+void NaClClearMachThreadForThreadIndex(uint32_t nacl_thread_index);
+
+#else
+
+/*
+ * NaClGetThreadIndexForMachThread is not implemented for x86-32, although it
+ * it could be implemented by using thread_get_state to obtain the thread's
+ * state and returning %gs >> 3. It's left unimplemented because the only
+ * prospective call sites already have access to the thread state and thus %gs
+ * themselves, and directing them through this function would add system call
+ * overhead for a redundant thread_get_state.
+ */
+
+static INLINE void NaClSetCurrentMachThreadForThreadIndex(
+    uint32_t nacl_thread_index) {
+  /* No-op for x86-32. */
+  UNREFERENCED_PARAMETER(nacl_thread_index);
+}
+
+static INLINE void NaClClearMachThreadForThreadIndex(
+    uint32_t nacl_thread_index) {
+  /* No-op for x86-32. */
+  UNREFERENCED_PARAMETER(nacl_thread_index);
+}
+
+#endif
+
+EXTERN_C_END
+
+#endif  /* NACL_OSX */
+
+#endif  /* NATIVE_CLIENT_SERVICE_RUNTIME_OSX_MACH_THREAD_MAP_H_ */