Remove socket.S implementation

This patch removes the socket.S implementation for all ports and replace
it by a C implementation using socketcall.  For ports that implement
the syscall directly, there is no change.

The patch idea is to simplify the socket function implementation that
uses the socketcall to be based on C implemetation instead of a pseudo
assembly implementation with arch specific parts.  The patch then remove
the assembly implementatation for the ports which uses socketcall
(i386, microblaze, mips, powerpc, sparc, m68k, s390 and sh).

I have cross-build GLIBC for afore-mentioned ports and tested on both
i386 and ppc32 without regressions.

sysdeps/unix/sysv/linux/sh/socket.S

@@ -1,179 +0,0 @@
-/* Copyright (C) 1999-2015 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-cancel.h>
-#include <socketcall.h>
-#include <tls.h>
-
-#define P(a, b) P2(a, b)
-#define P2(a, b) a##b
-
-	.text
-/* The socket-oriented system calls are handled unusally in Linux.
-   They are all gated through the single `socketcall' system call number.
-   `socketcall' takes two arguments: the first is the subcode, specifying
-   which socket function is being called; and the second is a pointer to
-   the arguments to the specific function.
-
-   The .S files for the other calls just #define socket and #include this.  */
-
-#ifndef __socket
-#ifndef NO_WEAK_ALIAS
-#define __socket P(__,socket)
-#else
-#define __socket socket
-#endif
-#endif
-
-#define PUSHARGS_1	mov.l r4,@-r15;	\
-			cfi_adjust_cfa_offset (4); \
-			cfi_rel_offset (r4, 0)
-#define PUSHARGS_2	mov.l r5,@-r15; \
-			cfi_adjust_cfa_offset (4); \
-			cfi_rel_offset (r5, 0); \
-			PUSHARGS_1
-#define PUSHARGS_3	mov.l r6,@-r15; \
-			cfi_adjust_cfa_offset (4); \
-			cfi_rel_offset (r6, 0); \
-			PUSHARGS_2
-#define PUSHARGS_4	mov.l r7,@-r15; \
-			cfi_adjust_cfa_offset (4); \
-			cfi_rel_offset (r7, 0); \
-			PUSHARGS_3
-#define PUSHARGS_5	PUSHARGS_4	/* Caller has already pushed arg 5 */
-#define PUSHARGS_6	PUSHARGS_4	/* Caller has already pushed arg 5,6 */
-
-#define POPARGS_1	add #4,r15; cfi_adjust_cfa_offset (-4)
-#define POPARGS_2	add #8,r15; cfi_adjust_cfa_offset (-8)
-#define POPARGS_3	add #12,r15; cfi_adjust_cfa_offset (-12)
-#define POPARGS_4	add #16,r15; cfi_adjust_cfa_offset (-16)
-#define POPARGS_5	POPARGS_4
-#define POPARGS_6	POPARGS_4
-
-#define ADJUSTCFI_1	cfi_adjust_cfa_offset (4); \
-			cfi_offset (r4, -4)
-#define ADJUSTCFI_2	cfi_adjust_cfa_offset (8); \
-			cfi_offset (r4, -4); \
-			cfi_offset (r5, -8)
-#define ADJUSTCFI_3	cfi_adjust_cfa_offset (12); \
-			cfi_offset (r4, -4); \
-			cfi_offset (r5, -8); \
-			cfi_offset (r6, -12)
-#define ADJUSTCFI_4	cfi_adjust_cfa_offset (16); \
-			cfi_offset (r4, -4); \
-			cfi_offset (r5, -8); \
-			cfi_offset (r6, -12); \
-			cfi_offset (r7, -16)
-#define ADJUSTCFI_5	ADJUSTCFI_4
-#define ADJUSTCFI_6	ADJUSTCFI_4
-
-#ifndef NARGS
-/* If we were called with no wrapper, this is really socket().  */
-#define NARGS 3
-#endif
-
-.globl __socket
-ENTRY (__socket)
-	/* This will not work in the case of a socket call being interrupted
-	   by a signal.  If the signal handler uses any stack the arguments
-	   to socket will be trashed.  The results of a restart of any
-	   socket call are then unpredictable.  */
-
-	/* Push args onto the stack.  */
-	P(PUSHARGS_,NARGS)
-
-#if defined NEED_CANCELLATION && defined CENABLE
-	SINGLE_THREAD_P
-	bf .Lsocket_cancel
-#endif
-
-	/* Do the system call trap.  */
-	mov #+P(SOCKOP_,socket), r4
-	mov r15, r5
-	mov.l .L1,r3
-	trapa #0x12
-
-	/* Pop args off the stack */
-	P(POPARGS_,NARGS)
-
-	mov     r0, r1
-	mov	#-12, r2
-	shad	r2, r1
-	not	r1, r1			// r1=0 means r0 = -1 to -4095
-	tst	r1, r1			// i.e. error in linux
-	bf	.Lpseudo_end
-.Lsyscall_error:
-	SYSCALL_ERROR_HANDLER
-.Lpseudo_end:
-	/* Successful; return the syscall's value.  */
-	rts
-	 nop
-
-#if defined NEED_CANCELLATION && defined CENABLE
-.Lsocket_cancel:
-	/* Enable asynchronous cancellation.  */
-	P(ADJUSTCFI_,NARGS)
-	sts.l pr,@-r15
-	cfi_adjust_cfa_offset (4)
-	cfi_rel_offset (pr, 0)
-	CENABLE
-	lds.l @r15+,pr
-	cfi_adjust_cfa_offset (-4)
-	cfi_restore (pr)
-
-	/* Do the system call trap.  */
-	mov #+P(SOCKOP_,socket), r4
-	mov r15, r5
-	mov.l .L1,r3
-	trapa #0x12
-
-	sts.l pr,@-r15
-	cfi_adjust_cfa_offset (4)
-	cfi_rel_offset (pr, 0)
-	mov.l r0,@-r15
-	cfi_adjust_cfa_offset (4)
-	cfi_rel_offset (r0, 0)
-	CDISABLE
-	mov.l @r15+,r0
-	cfi_adjust_cfa_offset (-4)
-	cfi_restore (r0)
-	lds.l @r15+,pr
-	cfi_adjust_cfa_offset (-4)
-	cfi_restore (pr)
-
-	/* Pop args off the stack */
-	P(POPARGS_,NARGS)
-
-	mov     r0, r1
-	mov	#-12, r2
-	shad	r2, r1
-	not	r1, r1			// r1=0 means r0 = -1 to -4095
-	tst	r1, r1			// i.e. error in linux
-	bf	.Lpseudo_end
-	bra	.Lsyscall_error
-	 nop
-#endif
-
-	.align 2
-.L1:
-	.long	SYS_ify(socketcall)
-
-PSEUDO_END (__socket)
-
-#ifndef NO_WEAK_ALIAS
-weak_alias (__socket, socket)
-#endif