nptl: Introduce <tcb-access.h> for THREAD_* accessors

These are common between most architectures.  Only the x86 targets
are outliers.

Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/sysdeps/nptl/tcb-access.h b/sysdeps/nptl/tcb-access.h
new file mode 100644
index 0000000000..b4137b8ab8
--- /dev/null
+++ b/sysdeps/nptl/tcb-access.h
@@ -0,0 +1,30 @@
+/* THREAD_* accessors.  Generic version based on struct pthread pointers.
+   Copyright (C) 2002-2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* Note: These are for accessing the TCB of the *current* thread.
+   descr can be disregarded on some targets as an optimization.  See
+   i386 for an example.  */
+
+#define THREAD_GETMEM(descr, member) \
+  descr->member
+#define THREAD_GETMEM_NC(descr, member, idx) \
+  descr->member[idx]
+#define THREAD_SETMEM(descr, member, value) \
+  descr->member = (value)
+#define THREAD_SETMEM_NC(descr, member, idx, value) \
+  descr->member[idx] = (value)