text: /*	$NetBSD: SYS.h,v 1.19 2009/12/14 01:07:41 matt Exp $ */
  /* $FreeBSD: soc2013/dpl/head/lib/libc/mips/SYS.h 214303 2010-10-24 05:22:07Z jchandra $ */
  
  /*-
   * Copyright (c) 1996 Jonathan Stone
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *      This product includes software developed by Jonathan Stone for
   *      the NetBSD Project.
   * 4. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  /*-
   * Copyright (c) 1991, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * This code is derived from software contributed to Berkeley by
   * Ralph Campbell.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   *	from: @(#)SYS.h	8.1 (Berkeley) 6/4/93
   */
  
  #include <sys/syscall.h>
  
  #include <machine/asm.h>
  
  /*
   * If compiling for shared libs, Emit sysV ABI PIC segment pseudo-ops.
   *
   * i)  Emit .abicalls before .LEAF entrypoint, and .cpload/.cprestore after.
   * ii) Do interprocedure jumps indirectly via t9, with the side-effect of
   *     preserving the callee's entry address in t9.
   */
  #ifdef __ABICALLS__
  	.abicalls
  # if defined(__mips_o32) || defined(__mips_o64)
  #  define PIC_PROLOGUE(x)	SETUP_GP
  #  define PIC_TAILCALL(l)	PTR_LA t9, _C_LABEL(l); jr t9
  #  define PIC_RETURN()		j ra
  # else
  #  define PIC_PROLOGUE(x)	SETUP_GP64(t3, x)
  #  define PIC_TAILCALL(l)	PTR_LA t9, _C_LABEL(l); RESTORE_GP64; jr t9
  #  define PIC_RETURN()		RESTORE_GP64; j ra
  # endif
  #else
  # define PIC_PROLOGUE(x)
  # define PIC_TAILCALL(l)	j  _C_LABEL(l)
  # define PIC_RETURN()		j ra
  #endif /* __ABICALLS__ */
  
  # define SYSTRAP(x)	li v0,SYS_ ## x; syscall;
  
  /*
   * Do a syscall that cannot fail (sync, get{p,u,g,eu,eg)id)
   */
  #define RSYSCALL_NOERROR(x)						\
  	PSEUDO_NOERROR(x)
  
  /*
   * Do a normal syscall.
   */
  #define RSYSCALL(x)							\
  	PSEUDO(x)
  
  /*
   * Do a renamed or pseudo syscall (e.g., _exit()), where the entrypoint
   * and syscall name are not the same.
   */
  #define PSEUDO_NOERROR(x)						\
  LEAF(__sys_ ## x);							\
  	.weak _C_LABEL(x);						\
  	_C_LABEL(x) = _C_LABEL(__CONCAT(__sys_,x));			\
  	.weak _C_LABEL(__CONCAT(_,x));					\
  	_C_LABEL(__CONCAT(_,x)) = _C_LABEL(__CONCAT(__sys_,x));		\
  	SYSTRAP(x);							\
  	j ra;								\
  	END(__sys_ ## x)
  
  #define PSEUDO(x)							\
  LEAF(__sys_ ## x);							\
  	.weak _C_LABEL(x);						\
  	_C_LABEL(x) = _C_LABEL(__CONCAT(__sys_,x));			\
  	.weak _C_LABEL(__CONCAT(_,x));					\
  	_C_LABEL(__CONCAT(_,x)) = _C_LABEL(__CONCAT(__sys_,x));		\
  	PIC_PROLOGUE(__sys_ ## x);					\
  	SYSTRAP(x);							\
  	bne a3,zero,err;						\
  	PIC_RETURN();							\
  err:									\
  	PIC_TAILCALL(__cerror);						\
  END(__sys_ ## x)
  