posix: Consolidate Linux sigsuspend implementation

This patch consolidates the sigsuspend Linux syscall generation on
sysdeps/unix/sysv/linux/sigsuspend.c.  It basically removes the alpha
assembly version which call the old sigsusped interface using only
the first doubleword from sigset. Current minimum supported kernel
on alpha (3.2) enforces rt_sigsuspend on the architecture
(__ARCH_WANT_SYS_RT_SIGSUSPEND option on kernel), so it is possible
to use the default implementation.

Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32,
arch64-linux-gnu, arm-linux-gnueabihf, powerpc64le-linux-gnu,
sparc64-linux-gnu, and sparcv9-linux-gnu.

	* sysdeps/unix/sysv/linux/alpha/sigsuspend.S: Remove file.
	* sysdeps/unix/sysv/linux/sigsuspend.c: Simplify include list.
	* nptl/Makefile (CFLAGS-sigsuspend.c): New rule.
	* sysdeps/unix/sysv/linux/sparc/sparc64/Makefile
	(CFLAGS-sigsuspend.c): Remove rule.

5 files changed, 7 insertions, 40 deletions

diff --git a/ChangeLog b/ChangeLog
index 0c30af6ccd..92e1c10dd7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
 2017-05-18  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
 
+	* sysdeps/unix/sysv/linux/alpha/sigsuspend.S: Remove file.
+	* sysdeps/unix/sysv/linux/sigsuspend.c: Simplify include list.
+	* nptl/Makefile (CFLAGS-sigsuspend.c): New rule.
+	* sysdeps/unix/sysv/linux/sparc/sparc64/Makefile
+	(CFLAGS-sigsuspend.c): Remove rule.
+
 	* sysdeps/unix/sysv/linux/Makefile (sysdeps_routines): Add tee.
 	(CFLAGS-tee.c): New rule.
 	* sysdeps/unix/sysv/linux/syscalls.list: Remove tee from
diff --git a/nptl/Makefile b/nptl/Makefile
index cdf69bd033..57eab33ac5 100644
--- a/nptl/Makefile
+++ b/nptl/Makefile
@@ -217,6 +217,7 @@ CFLAGS-close.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-read.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-write.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-nanosleep.c = -fexceptions -fasynchronous-unwind-tables
+CFLAGS-sigsuspend.c = -fexceptions -fasynchronous-unwind-tables
 
 CFLAGS-pt-system.c = -fexceptions
 
diff --git a/sysdeps/unix/sysv/linux/alpha/sigsuspend.S b/sysdeps/unix/sysv/linux/alpha/sigsuspend.S
deleted file mode 100644
index c226be14a2..0000000000
--- a/sysdeps/unix/sysv/linux/alpha/sigsuspend.S
+++ /dev/null
@@ -1,32 +0,0 @@
-/* Copyright (C) 1993-2017 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by David Mosberger <davidm@cs.arizona.edu>, 1995.
-
-   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/>.  */
-
-/* sigsuspend is a special syscall since it needs to dereference the
-   sigset.  This will have to change when we have more than 64 signals.  */
-
-#include <sysdep-cancel.h>
-
-#undef PSEUDO_PREPARE_ARGS
-#define PSEUDO_PREPARE_ARGS	ldq	a0, 0(a0);
-
-PSEUDO(__sigsuspend, sigsuspend, 1)
-	ret
-PSEUDO_END(__sigsuspend)
-libc_hidden_def (__sigsuspend)
-weak_alias (__sigsuspend, sigsuspend)
-strong_alias (__sigsuspend, __libc_sigsuspend)
diff --git a/sysdeps/unix/sysv/linux/sigsuspend.c b/sysdeps/unix/sysv/linux/sigsuspend.c
index 8bb0cd4915..df29abfbe9 100644
--- a/sysdeps/unix/sysv/linux/sigsuspend.c
+++ b/sysdeps/unix/sysv/linux/sigsuspend.c
@@ -15,12 +15,8 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <errno.h>
 #include <signal.h>
-#include <unistd.h>
-
 #include <sysdep-cancel.h>
-#include <sys/syscall.h>
 
 /* Change the set of blocked signals to SET,
    wait until a signal arrives, and restore the set of blocked signals.  */
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/Makefile b/sysdeps/unix/sysv/linux/sparc/sparc64/Makefile
index 3a7f4aa84a..715af3df7b 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/Makefile
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/Makefile
@@ -7,7 +7,3 @@ LD += -melf64_sparc
 ifeq ($(subdir),stdlib)
 sysdep_routines += __start_context
 endif
-
-ifeq ($(subdir),nptl)
-CFLAGS-sigsuspend.c += -fexceptions
-endif