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

/* Copyright (C) 1999, 2000 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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <sysdep.h>
#include <socketcall.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
#define __socket P(__,socket)
#endif

#define PUSHARGS_1	mov.l r4,@-r15
#define PUSHARGS_2	mov.l r5,@-r15; PUSHARGS_1
#define PUSHARGS_3	mov.l r6,@-r15; PUSHARGS_2
#define PUSHARGS_4	mov.l r7,@-r15; 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
#define POPARGS_2	add #8,r15
#define POPARGS_3	add #12,r15
#define POPARGS_4	add #16,r15
#define POPARGS_5	add #16,r15
#define POPARGS_6	add #16,r15 

#ifndef NARGS
#define NARGS 3			/* If we were called with no wrapper, this is really socket() */
#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)

        /* 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	1f

	mov.l .L2, r1
#ifdef SHARED
	mov	r0, r4
	mov.l	r12, @-r15
	sts.l	pr, @-r15
        mov.l	0f, r12
	mova	0f, r0
	add	r0, r12
	mova	.L2, r0
	add	r0, r1
	jsr @r1
	 nop
	lds.l	@r15+, pr
	rts
	 mov.l	@r15+, r12
	.align 2
0:
	.long	_GLOBAL_OFFSET_TABLE_
#else
	jmp @r1
	 mov	r0, r4
#endif
1:
	/* Successful; return the syscall's value.  */
	rts
	 nop
	.align 2
.L1:
	.long	SYS_ify(socketcall)
.L2:
	.long	PLTJMP(C_SYMBOL_NAME(__syscall_error))

PSEUDO_END (__socket)

weak_alias (__socket, socket)