From 4a2d94b24f6c114d4f5515899a3254df78d58f34 Mon Sep 17 00:00:00 2001
From: visa <>
Date: Thu, 20 Apr 2017 16:07:52 +0000
Subject: Get TCB address using the RDHWR instruction instead of __get_tcb().
 This gives fast access to the address on systems that implement the UserLocal
 register. TCB caching is still used when running in the single-threaded mode
 in order not to penalize old systems.

The kernel counterpart of this change must be in place before
using this diff!

With guenther@
---
 src/lib/libc/include/cancel.h | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

(limited to 'src')

diff --git a/src/lib/libc/include/cancel.h b/src/lib/libc/include/cancel.h
index a858b80a1c..ada417d3e1 100644
--- a/src/lib/libc/include/cancel.h
+++ b/src/lib/libc/include/cancel.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: cancel.h,v 1.2 2016/05/10 05:42:31 guenther Exp $ */
+/*	$OpenBSD: cancel.h,v 1.3 2017/04/20 16:07:52 visa Exp $ */
 /*
  * Copyright (c) 2015 Philip Guenther <guenther@openbsd.org>
  *
@@ -26,11 +26,12 @@ __BEGIN_HIDDEN_DECLS
 __dead void	_thread_canceled(void);
 __END_HIDDEN_DECLS
 
-#ifdef __LIBC__
+#if defined(__LIBC__) && !defined(TCB_HAVE_MD_SET)
 /*
- * Redirect macros that would use the syscall to instead use our callback
+ * Override TIB_GET macro to use the caching callback
  */
-#define __get_tcb()	_thread_cb.tc_tcb()
+#undef TIB_GET
+#define TIB_GET()	TCB_TO_TIB(_thread_cb.tc_tcb())
 #endif
 
 #define PREP_CANCEL_POINT(tib)						\
-- 
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