[PATCH v3 14/21] nptl: m68k: 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 m68k-linux-gnu.
---
 sysdeps/unix/sysv/linux/m68k/syscall_cancel.S | 87 +++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 sysdeps/unix/sysv/linux/m68k/syscall_cancel.S

diff --git a/sysdeps/unix/sysv/linux/m68k/syscall_cancel.S b/sysdeps/unix/sysv/linux/m68k/syscall_cancel.S
new file mode 100644
index 0000000000..4e5223ee7b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/m68k/syscall_cancel.S
@@ -0,0 +1,87 @@
+/* Cancellable syscall wrapper.  Linux/m68k 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,
+				   __syscall_arg_t nr,
+				   __syscall_arg_t arg1,
+				   __syscall_arg_t arg2,
+				   __syscall_arg_t arg3,
+				   __syscall_arg_t arg4,
+				   __syscall_arg_t arg5,
+				   __syscall_arg_t arg6,
+				   __syscall_arg_t arg7)  */
+
+
+ENTRY (__syscall_cancel_arch)
+#ifdef __mcoldfire__
+	lea	(-16,%sp),%sp
+	movem.l	#60,(%sp)
+#else
+	movem.l	#15360,-(%sp)
+#endif
+	cfi_def_cfa_offset (20)
+	cfi_offset (2, -20)
+	cfi_offset (3, -16)
+	cfi_offset (4, -12)
+	cfi_offset (5, -8)
+
+	.global __syscall_cancel_arch_start
+	.type	__syscall_cancel_arch_start,%function
+__syscall_cancel_arch_start:
+
+	move.l	20(%sp),%a0
+	move.l	(%a0),%d0
+#ifdef __mcoldfire__
+	move.w	%d0,%ccr
+	jeq	1f
+#else
+	btst	#2,%d0
+	jne 	1f
+#endif
+
+	move.l	48(%sp),%a0
+	move.l	44(%sp),%d5
+	move.l	40(%sp),%d4
+	move.l	36(%sp),%d3
+	move.l	32(%sp),%d2
+	move.l	28(%sp),%d1
+	move.l	24(%sp),%d0
+	trap #0
+
+	.global __syscall_cancel_arch_end
+	.type	__syscall_cancel_arch_end,%function
+__syscall_cancel_arch_end:
+
+#ifdef __mcoldfire__
+	movem.l	(%sp),#60
+	lea	(16,%sp),%sp
+#else
+	movem.l	(%sp)+,#60
+#endif
+	rts
+
+1:
+#ifdef PIC
+	bsr.l __syscall_do_cancel
+#else
+	jsr __syscall_do_cancel
+#endif
+END (__syscall_cancel_arch)
+libc_hidden_def (__syscall_cancel_arch)
-- 
2.17.1