lib/libc/arch/mips/SYS.h

   1 /*      $NetBSD: SYS.h,v 1.19 2009/12/14 01:07:41 matt Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1996 Jonathan Stone
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by Jonathan Stone for
  18  *      the NetBSD Project.
  19  * 4. The name of the author may not be used to endorse or promote products
  20  *    derived from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 /*-
  35  * Copyright (c) 1991, 1993
  36  *      The Regents of the University of California.  All rights reserved.
  37  *
  38  * This code is derived from software contributed to Berkeley by
  39  * Ralph Campbell.
  40  *
  41  * Redistribution and use in source and binary forms, with or without
  42  * modification, are permitted provided that the following conditions
  43  * are met:
  44  * 1. Redistributions of source code must retain the above copyright
  45  *    notice, this list of conditions and the following disclaimer.
  46  * 2. Redistributions in binary form must reproduce the above copyright
  47  *    notice, this list of conditions and the following disclaimer in the
  48  *    documentation and/or other materials provided with the distribution.
  49  * 3. Neither the name of the University nor the names of its contributors
  50  *    may be used to endorse or promote products derived from this software
  51  *    without specific prior written permission.
  52  *
  53  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  54  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  55  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  56  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  57  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  58  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  59  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  60  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  61  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  62  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  63  * SUCH DAMAGE.
  64  *
  65  *      from: @(#)SYS.h 8.1 (Berkeley) 6/4/93
  66  */
  67
  68 #include <sys/syscall.h>
  69 #include <mips/asm.h>
  70
  71
  72 /*
  73  * If compiling for shared libs, Emit sysV ABI PIC segment pseudo-ops.
  74  *
  75  * i)  Emit .abicalls before .LEAF entrypoint, and .cpload/.cprestore after.
  76  * ii) Do interprocedure jumps indirectly via t9, with the side-effect of
  77  *     preserving the callee's entry address in t9.
  78  */
  79 #ifdef __ABICALLS__
  80         .abicalls
  81 # if defined(__mips_o32) || defined(__mips_o64)
  82 #  define PIC_PROLOGUE(x)       SETUP_GP
  83 #  define PIC_TAILCALL(l)       PTR_LA t9, _C_LABEL(l); jr t9
  84 #  define PIC_RETURN()          j ra
  85 # else
  86 #  define PIC_PROLOGUE(x)       SETUP_GP64(t3, x)
  87 #  define PIC_TAILCALL(l)       PTR_LA t9, _C_LABEL(l); RESTORE_GP64; jr t9
  88 #  define PIC_RETURN()          RESTORE_GP64; j ra
  89 # endif
  90 #else
  91 # define PIC_PROLOGUE(x)
  92 # define PIC_TAILCALL(l)        j  _C_LABEL(l)
  93 # define PIC_RETURN()
  94 #endif /* __ABICALLS__ */
  95
  96
  97 #ifdef __STDC__
  98 # define SYSTRAP(x)     li v0,SYS_ ## x; syscall;
  99 #else
 100 # define SYSTRAP(x)     li v0,SYS_/**/x; syscall;
 101 #endif
 102
 103
 104 /*
 105  * Do a syscall that cannot fail (sync, get{p,u,g,eu,eg)id)
 106  */
 107 #define RSYSCALL_NOERROR(x)                                             \
 108         PSEUDO_NOERROR(x,x)
 109
 110 /*
 111  * Do a normal syscall.
 112  */
 113 #define RSYSCALL(x)                                                     \
 114         PSEUDO(x,x)
 115
 116 /*
 117  * Do a syscall that has an internal name and a weak external alias.
 118  */
 119 #define WSYSCALL(weak,strong)                                           \
 120         WEAK_ALIAS(weak,strong);                                        \
 121         PSEUDO(strong,weak)
 122
 123 /*
 124  * Do a renamed or pseudo syscall (e.g., _exit()), where the entrypoint
 125  * and syscall name are not the same.
 126  */
 127 #define PSEUDO_NOERROR(x,y)                                             \
 128 LEAF(x);                                                                \
 129         SYSTRAP(y);                                                     \
 130         j ra;                                                           \
 131         END(x)
 132
 133 #define PSEUDO(x,y)                                                     \
 134 LEAF(x);                                                                \
 135         PIC_PROLOGUE(x);                                                \
 136         SYSTRAP(y);                                                     \
 137         bne a3,zero,err;                                                \
 138         PIC_RETURN();                                                   \
 139 err:                                                                    \
 140         PIC_TAILCALL(__cerror);                                         \
 141 END(x)