[glibc/azanella/bz12683] nptl: x32: Fix Race conditions in pthread cancellation [BZ#12683]

[Adhemerval Zanella <azanella@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f43cde177323f0bdc71ec9ac78f1985984284af0

commit f43cde177323f0bdc71ec9ac78f1985984284af0
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Sat May 9 14:20:26 2015 -0300

    nptl: x32: Fix Race conditions in pthread cancellation [BZ#12683]
    
    This patches adds the x32 modification required for the BZ#12683.
    It follows the x86_64-x32 ABI and pointers are zero-extended.
    
    Checked on x86_64-linux-gnu-x32.

Diff:
---
 sysdeps/unix/sysv/linux/x86_64/x32/syscall_types.h | 36 ++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/syscall_types.h b/sysdeps/unix/sysv/linux/x86_64/x32/syscall_types.h
new file mode 100644
index 0000000000..fd9f14d566
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/syscall_types.h
@@ -0,0 +1,36 @@
+/* Types and macros used for syscall issuing.  x86_64/x32 version.
+   Copyright (C) 2020 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/>.  */
+
+#ifndef _SYSCALL_TYPES_H
+#define _SYSCALL_TYPES_H
+
+#include <libc-diag.h>
+
+typedef long long int __syscall_arg_t;
+
+/* Syscall arguments for x32 follows x86_64 ABI, however pointers are 32 bits
+   should be zero extended.  */
+#define __SSC(__x)						\
+  ({								\
+    __syscall_arg_t __arg = sizeof (1 ? (__x) : 0ULL) < 8	\
+      ? (unsigned long int) (uintptr_t)(__x) 			\
+      : (__syscall_arg_t) (__typeof__ ((__x) - (__x))) (__x);	\
+    __arg;							\
+  })
+
+#endif