alpha: Use Linux generic sigaction implementation

Alpha rt_sigaction syscall uses a slight different kernel ABI than
generic one:

arch/alpha/kernel/signal.c

 90 SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
 91                 struct sigaction __user *, oact,
 92                 size_t, sigsetsize, void __user *, restorer)

Similar as sparc, the syscall expects a restorer function.  However
different than sparc, alpha defines the restorer as the 5th argument
(sparc defines as the 4th).

This patch removes the arch-specific alpha sigaction implementation,
adapt the Linux generic one to different restore placements (through
STUB macro), and make alpha use the Linux generic kernel_sigaction
definition.

Checked on alpha-linux-gnu and x86_64-linux-gnu (for sanity).

	* sysdeps/unix/sysv/linux/alpha/Makefile: Update comment about
	__syscall_rt_sigaction.
	* sysdeps/unix/sysv/linux/alpha/kernel_sigaction.h
	(kernel_sigaction): Use Linux generic defintion.
	(STUB): Define.
	(__syscall_rt_sigreturn, __syscall_sigreturn): Add prototype.
	* sysdeps/unix/sysv/linux/alpha/rt_sigaction.S
	(__syscall_rt_sigaction): Remove implementation.
	(__syscall_sigreturn, __syscall_rt_sigreturn): Define as global and
	hidden.
	* sysdeps/unix/sysv/linux/alpha/sigaction.c: Remove file.
	* sysdeps/unix/sysv/linux/alpha/sysdep.h (INLINE_SYSCALL,
	INTERNAL_SYSCALL): Remove definitions.
	* sysdeps/unix/sysv/linux/sigaction.c: Define STUB to accept both the
	action and signal set size.
	* sysdeps/unix/sysv/linux/sparc/sparc32/sigaction.c (STUB): Redefine.
	* sysdeps/unix/sysv/linux/sparc/sparc64/sigaction.c (STUB): Likewise.

1 files changed, 0 insertions, 38 deletions

diff --git a/sysdeps/unix/sysv/linux/alpha/sigaction.c b/sysdeps/unix/sysv/linux/alpha/sigaction.c
deleted file mode 100644
index 8051043587..0000000000
--- a/sysdeps/unix/sysv/linux/alpha/sigaction.c
+++ /dev/null
@@ -1,38 +0,0 @@
-/* Copyright (C) 2003-2018 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>
-#include <sys/cdefs.h>
-#include <stddef.h>
-
-/*
- * In order to get the hidden arguments for rt_sigaction set up
- * properly, we need to call the assembly version.  Detect this in the
- * INLINE_SYSCALL macro, and fail to expand inline in that case.
- */
-
-#undef INLINE_SYSCALL
-#define INLINE_SYSCALL(name, nr, args...)       \
-        (__NR_##name == __NR_rt_sigaction       \
-         ? __syscall_rt_sigaction(args)         \
-         : INLINE_SYSCALL1(name, nr, args))
-
-struct kernel_sigaction;
-extern int __syscall_rt_sigaction (int, const struct kernel_sigaction *,
-				   struct kernel_sigaction *, size_t);
-
-#include <sysdeps/unix/sysv/linux/sigaction.c>