lib/libc/arch/sparc/SYS.h

   1 /*-
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This software was developed by the Computer Systems Engineering group
   6  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
   7  * contributed to Berkeley.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)SYS.h       8.1 (Berkeley) 6/4/93
  34  *
  35  *      from: Header: SYS.h,v 1.2 92/07/03 18:57:00 torek Exp
  36  *      $NetBSD: SYS.h,v 1.18 2011/03/28 11:19:12 martin Exp $
  37  */
  38
  39 #include <machine/asm.h>
  40 #include <sys/syscall.h>
  41 #include <machine/trap.h>
  42
  43 #ifdef __STDC__
  44 #define _CAT(x,y) x##y
  45 #else
  46 #define _CAT(x,y) x/**/y
  47 #endif
  48
  49 #ifdef __ELF__
  50 #define CERROR          _C_LABEL(__cerror)
  51 #define CURBRK          _C_LABEL(__curbrk)
  52 #else
  53 #define CERROR          _ASM_LABEL(cerror)
  54 #define CURBRK          _ASM_LABEL(curbrk)
  55 #endif
  56
  57 /*
  58  * ERROR branches to cerror.
  59  */
  60 #ifdef PIC
  61 #define CALL(name)                              \
  62         PIC_PROLOGUE(%g1, %g5);                 \
  63         set     name, %g5;                      \
  64         ld      [%g1 + %g5], %g5;               \
  65         jmp     %g5;                            \
  66          nop
  67 #else
  68 #define CALL(name)                              \
  69         set     name, %g1;                      \
  70         jmp     %g1;                            \
  71          nop
  72 #endif
  73 #define ERROR() CALL(CERROR)
  74
  75 /*
  76  * SYSCALL is used when further action must be taken before returning.
  77  * Note that it adds a `nop' over what we could do, if we only knew
  78  * what came at label 1....
  79  */
  80 #define _SYSCALL(x,y)                           \
  81 ENTRY(x);                                       \
  82         mov     _CAT(SYS_,y), %g1;              \
  83         t       ST_SYSCALL;                     \
  84         bcc     1f;                             \
  85          nop;                                   \
  86         ERROR();                                \
  87 1:      /* next insn */
  88
  89 #define SYSCALL(x)                              \
  90         _SYSCALL(x,x)
  91
  92 /*
  93  * RSYSCALL is used when the system call should just return.  Here we
  94  * use the SYSCALL_G5RFLAG to put the `success' return address in %g5
  95  * and avoid a branch.
  96  *
  97  * PSEUDO(x,y) is like RSYSCALL(y), except that the name is x.
  98  */
  99 #define _RSYSCALL(x,y)                                  \
 100 ENTRY(x);                                               \
 101         mov     (_CAT(SYS_,y)) | SYSCALL_G5RFLAG, %g1;  \
 102         add     %o7, 8, %g5;                            \
 103         t       ST_SYSCALL;                             \
 104         ERROR()
 105
 106 #define RSYSCALL(x)     _RSYSCALL(x,x)
 107 #define PSEUDO(x,y)     _RSYSCALL(x,y)
 108
 109 /*
 110  * WSYSCALL(weak,strong) is like RSYSCALL(weak),
 111  * except that weak is a weak internal alias for the strong symbol.
 112  */
 113 #ifdef WEAK_ALIAS
 114 #define WSYSCALL(weak,strong)                   \
 115         WEAK_ALIAS(weak,strong);                \
 116         PSEUDO(strong,weak)
 117 #else
 118 #define WSYSCALL(weak,strong)                   \
 119         RSYSCALL(weak)
 120 #endif
 121
 122 /*
 123  * SYSCALL_NOERROR is like SYSCALL, except it's used for syscalls that
 124  * never fail.
 125  *
 126  * XXX - This should be optimized.
 127  */
 128 #define SYSCALL_NOERROR(x)                      \
 129 ENTRY(x);                                       \
 130         mov     _CAT(SYS_,x), %g1;              \
 131         t       ST_SYSCALL
 132
 133 /*
 134  * RSYSCALL_NOERROR is like RSYSCALL, except it's used for syscalls
 135  * that never fail.
 136  *
 137  * PSEUDO_NOERROR(x,y) is like RSYSCALL_NOERROR(y), except that the
 138  * name is x.
 139  *
 140  * XXX - This should be optimized.
 141  */
 142 #define _RSYSCALL_NOERROR(x,y)                          \
 143 ENTRY(x);                                               \
 144         mov     (_CAT(SYS_,y)) | SYSCALL_G5RFLAG, %g1;  \
 145         add     %o7, 8, %g5;                            \
 146         t       ST_SYSCALL
 147
 148 #define RSYSCALL_NOERROR(x)     _RSYSCALL_NOERROR(x,x)
 149 #define PSEUDO_NOERROR(x,y)     _RSYSCALL_NOERROR(x,y)
 150
 151         .globl  CERROR