[PATCH v4 04/21] nptl: x32: Fix Race conditions in pthread cancellation [BZ#12683]

[Adhemerval Zanella]

This patches adds the x32 modification required for the BZ#12683.
It follows the x86_64-x32 ABI and pointers are zero-extended.
However, compiler may not see such cases and accuse a cast from pointer
to integer of different size and for such cases the warning is
explict disabled.

Checked on x86_64-linux-gnu-x32.
---
 .../sysv/linux/x86_64/x32/syscall_types.h     | 40 +++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 sysdeps/unix/sysv/linux/x86_64/x32/syscall_types.h

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..25b10a0b28
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/syscall_types.h
@@ -0,0 +1,40 @@
+/* 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.  However compiler may not see such cases and
+   accuse a cast from pointer to integer of different size.  */
+#define __SSC(__x)						\
+  ({								\
+    DIAG_PUSH_NEEDS_COMMENT;					\
+    DIAG_IGNORE_NEEDS_COMMENT (5, "-Wpointer-to-int-cast");	\
+    __syscall_arg_t __arg = sizeof (1 ? (__x) : 0ULL) < 8	\
+			    ? (unsigned long int) (__x) 	\
+			    : (long long int) ((__x));		\
+    DIAG_POP_NEEDS_COMMENT;					\
+    __arg;							\
+  })
+
+#endif
-- 
2.17.1