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

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

[Adhemerval Zanella]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f1abcb2c1bbc558a5728d9ddaabbcb755fe7808d

commit f1abcb2c1bbc558a5728d9ddaabbcb755fe7808d
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Wed Jun 2 10:43:37 2021 -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 kABI for the _SSC macro.
    
    Checked on x86_64-linux-gnu-x32.

Diff:
---
 sysdeps/unix/sysv/linux/x86_64/x32/syscall_types.h | 32 ++++++++++++++++++++++
 1 file changed, 32 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..bc8baa281a
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/syscall_types.h
@@ -0,0 +1,32 @@
+/* Types and macros used for syscall issuing.
+   Copyright (C) 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/>.  */
+
+#ifndef _SYSCALL_TYPES_H
+#define _SYSCALL_TYPES_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) \
+ ({					\
+    TYPEFY (__x, __tmp) = ARGIFY (__x);	\
+    (__syscall_arg_t) __tmp;		\
+  })
+
+#endif