[PATCH v3 13/21] nptl: hppa: Fix Race conditions in pthread cancellation (BZ#12683)

[Adhemerval Zanella <adhemerval dot zanella at linaro dot org>]

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

Checked on hppa-linux-gnu.
---
 sysdeps/unix/sysv/linux/hppa/syscall_cancel.S | 82 +++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 sysdeps/unix/sysv/linux/hppa/syscall_cancel.S

diff --git a/sysdeps/unix/sysv/linux/hppa/syscall_cancel.S b/sysdeps/unix/sysv/linux/hppa/syscall_cancel.S
new file mode 100644
index 0000000000..14e1f5f0a7
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/hppa/syscall_cancel.S
@@ -0,0 +1,82 @@
+/* Cancellable syscall wrapper.  Linux/hppa 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
+   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
+   <http://www.gnu.org/licenses/>.  */
+
+#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)  */
+
+	.text
+ENTRY(__syscall_cancel_arch)
+	stw	%r2,-20(%r30)
+	ldo	128(%r30),%r30
+	cfi_def_cfa_offset (-128)
+	cfi_offset (2, -20)
+	ldw	-180(%r30),%r28
+	copy	%r24,%r31
+	stw	%r28,-104(%r30)
+	ldw	-184(%r30),%r28
+	stw	%r28,-108(%r30)
+	ldw	-188(%r30),%r28
+	stw	%r28,-112(%r30)
+	ldw	-192(%r30),%r28
+	stw	%r4,-100(%r30)
+	stw	%r28,-116(%r30)
+	copy	%r25,%r28
+	copy	%r23,%r25
+	stw	%r19,-32(%r30)
+	cfi_offset (4, 28)
+
+	.global __syscall_cancel_arch_start
+	.type   __syscall_cancel_arch_start,@function
+__syscall_cancel_arch_start:
+
+	ldw	0(%r26),%r20
+	stw	%r20,-120(%r30)
+	ldw	-120(%r30),%r20
+	bb,<	%r20,29,1f
+	ldw	-116(%r30),%r21
+	ldw	-112(%r30),%r22
+	copy	%r31,%r26
+	ldw	-108(%r30),%r23
+	ldw	-104(%r30),%r24
+	copy	%r19, %r4
+	ble	0x100(%sr2, %r0)
+
+	.global __syscall_cancel_arch_end
+	.type   __syscall_cancel_arch_end,@function
+__syscall_cancel_arch_end:
+
+	copy	%r28, %r20
+	copy	%r4, %r19
+	ldw	-148(%r30),%r2
+	ldw	-100(%r30),%r4
+	bv	%r0(%r2)
+	ldo	-128(%r30),%r30
+1:
+	bl	__syscall_do_cancel,%r2
+	nop
+	nop
+END(__syscall_cancel_arch)
+libc_hidden_def (__syscall_cancel_arch)
-- 
2.17.1