lib/libc/arch/sparc64/SYS.h

   1 /*      $NetBSD: SYS.h,v 1.14 2011/03/28 11:19:13 martin Exp $  */
   2
   3 /*-
   4  * Copyright (c) 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This software was developed by the Computer Systems Engineering group
   8  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
   9  * contributed to Berkeley.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  *      @(#)SYS.h       8.1 (Berkeley) 6/4/93
  36  *
  37  *      from: Header: SYS.h,v 1.2 92/07/03 18:57:00 torek Exp
  38  */
  39
  40 #include <machine/asm.h>
  41 #include <sys/syscall.h>
  42 #include <machine/trap.h>
  43
  44 #ifdef __STDC__
  45 #define _CAT(x,y) x##y
  46 #else
  47 #define _CAT(x,y) x/**/y
  48 #endif
  49
  50 /*
  51  * ERROR branches to cerror.  This is done with a macro so that I can
  52  * change it to be position independent later, if need be.
  53  */
  54 #ifdef PIC
  55 #ifdef BIGPIC
  56 #define JUMP(name) \
  57         PIC_PROLOGUE(%g1,%g5); \
  58         sethi %hi(_C_LABEL(name)),%g5; \
  59         or %g5,%lo(_C_LABEL(name)),%g5; \
  60         ldx [%g1+%g5],%g5; \
  61         jmp %g5; \
  62         nop
  63 #else
  64 #define JUMP(name) \
  65         PIC_PROLOGUE(%g1,%g5); \
  66         ldx [%g1+_C_LABEL(name)],%g5; jmp %g5; nop
  67 #endif
  68 #else
  69 #define JUMP(name)      set _C_LABEL(name),%g1; jmp %g1; nop
  70 #endif
  71 #define ERROR()         JUMP(__cerror)
  72 /*
  73  * SYSCALL is used when further action must be taken before returning.
  74  * Note that it adds a `nop' over what we could do, if we only knew what
  75  * came at label 1....
  76  */
  77 #define _SYSCALL(x,y) \
  78         ENTRY(x); mov _CAT(SYS_,y),%g1; t ST_SYSCALL; bcc 1f; nop; ERROR(); 1:
  79
  80 #define SYSCALL(x) \
  81         _SYSCALL(x,x)
  82
  83 /*
  84  * RSYSCALL is used when the system call should just return.  Here
  85  * we use the SYSCALL_G5RFLAG to put the `success' return address in %g5
  86  * and avoid a branch.
  87  */
  88 #define RSYSCALL(x) \
  89         ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G5RFLAG,%g1; add %o7,8,%g5; \
  90         t ST_SYSCALL; ERROR()
  91
  92 /*
  93  * PSEUDO(x,y) is like RSYSCALL(y) except that the name is x.
  94  */
  95 #define PSEUDO(x,y) \
  96         ENTRY(x); mov (_CAT(SYS_,y))|SYSCALL_G5RFLAG,%g1; add %o7,8,%g5; \
  97         t ST_SYSCALL; ERROR()
  98
  99 /*
 100  * WSYSCALL(weak,strong) is like RSYSCALL(weak), except that weak is
 101  * a weak internal alias for the strong symbol.
 102  */
 103 #define WSYSCALL(weak,strong) \
 104         WEAK_ALIAS(weak,strong); \
 105         PSEUDO(strong,weak)
 106
 107 /*
 108  * SYSCALL_NOERROR is like SYSCALL, except it's used for syscalls
 109  * that never fail.
 110  *
 111  * XXX - This should be optimized.
 112  */
 113 #define SYSCALL_NOERROR(x) \
 114         ENTRY(x); mov _CAT(SYS_,x),%g1; t ST_SYSCALL
 115
 116 /*
 117  * RSYSCALL_NOERROR is like RSYSCALL, except it's used for syscalls
 118  * that never fail.
 119  *
 120  * XXX - This should be optimized.
 121  */
 122 #define RSYSCALL_NOERROR(x) \
 123         ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G5RFLAG,%g1; add %o7,8,%g5; \
 124         t ST_SYSCALL
 125
 126 /*
 127  * PSEUDO_NOERROR(x,y) is like RSYSCALL_NOERROR(y) except that the name is x.
 128  */
 129 #define PSEUDO_NOERROR(x,y) \
 130         ENTRY(x); mov (_CAT(SYS_,y))|SYSCALL_G5RFLAG,%g1; add %o7,8,%g5; \
 131         t ST_SYSCALL
 132
 133         .globl  _C_LABEL(__cerror)