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[PATCH v3 11/21] nptl: microblaze: Fix Race conditions in pthread cancellation (BZ#12683)

This patch adds the microblaze modifications required for the BZ#12683 fix
by adding the arch-specific cancellation syscall bridge.

Checked against a build and make check run-built-tests=no for
 .../sysv/linux/microblaze/syscall_cancel.S    | 64 +++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 sysdeps/unix/sysv/linux/microblaze/syscall_cancel.S

diff --git a/sysdeps/unix/sysv/linux/microblaze/syscall_cancel.S b/sysdeps/unix/sysv/linux/microblaze/syscall_cancel.S
new file mode 100644
index 0000000000..19f566ba61
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/microblaze/syscall_cancel.S
@@ -0,0 +1,64 @@
+/* Cancellable syscall wrapper.  Linux/microblaze version.
+   Copyright (C) 2019 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
+   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
+   <>.  */
+#include <sysdep.h>
+/* long int __syscall_cancel_arch (int *cancelhandling,
+				   long int nr,
+				   long int arg1,
+				   long int arg2,
+				   long int arg3,
+				   long int arg4,
+				   long int arg5,
+				   long int arg6)  */
+ENTRY (__syscall_cancel_arch)
+	.globl __syscall_cancel_arch_start
+	.type  __syscall_cancel_arch_start, @function
+	lwi	r3,r5,0
+	andi	r3,r3,4 #and1
+	bneid	r3,1f
+	addk	r12,r6,r0
+	addk	r5,r7,r0
+	addk	r6,r8,r0
+	addk	r7,r9,r0
+	addk	r8,r10,r0
+	lwi	r9,r1,56
+	lwi	r10,r1,60
+	brki	r14,8
+	.globl __syscall_cancel_arch_end
+	.type  __syscall_cancel_arch_end, @function
+	nop
+	lwi	r15,r1,0
+	rtsd	r15,8
+	addik	r1,r1,28
+	brlid	r15, __syscall_do_cancel
+	nop
+END (__syscall_cancel_arch)
+libc_hidden_def (__syscall_cancel_arch)

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