mdw@git.distorted.org.uk Git - ssr/blob - StraySrc/Libraries/Core/h/swiv

   1 /*
   2  * swiv.h
   3  *
   4  * Interface to SWI veneer
   5  *
   6  * © 1997, 1998 Straylight
   7  */
   8
   9 /*----- Licensing note ----------------------------------------------------*
  10  *
  11  * This file is part of Straylight's core library (corelib).
  12  *
  13  * Corelib is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2, or (at your option)
  16  * any later version.
  17  *
  18  * Corelib is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with Corelib.  If not, write to the Free Software Foundation,
  25  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  */
  27
  28 #ifndef ___swis_h
  29 #define ___swis_h
  30
  31 #ifdef __cplusplus
  32   extern "C" {
  33 #endif
  34
  35 #ifndef __kernel_h
  36   #include "kernel.h"
  37 #endif
  38
  39 /* --- SWI veneer functions --- *
  40  *
  41  * Arguments:   int swi == the SWI to call
  42  *              unsigned flags == a definition of the SWIs registers
  43  *
  44  * Returns:     _swi returns the value of the `return' register in the flags
  45  *              _swix returns 0, or a pointer to an error block
  46  *
  47  * Use:         Calls a SWI, passing it a collection of registers, and
  48  *              filling in the registers as given in the function call.
  49  *
  50  *              Order of arguments is as follows:
  51  *
  52  *              Input registers:        One word for each input register
  53  *              Output registers:       Address to store each reg value
  54  *              Flags address:          Address to store PC+flags value
  55  *              Block contents:         Build contents of local block at end
  56  */
  57
  58 extern int _swi(int /*swi*/, unsigned /*flags*/,...);
  59 extern _kernel_oserror *_swix(int /*swi*/, unsigned /*flags*/,...);
  60
  61 /* --- Various flags settings --- *
  62  *
  63  * _in(n) -- declare Rn as an input register
  64  * _inr(m, n) -- declare Rm--Rn as input registers
  65  * _out(n) -- declare Rn as an output register
  66  * _outr(m, n) -- declare Rm--Rn as output registers
  67  * _return(n) -- return Rn from _swi
  68  * _block(n) -- point Rn at block containing remaining arguments
  69  */
  70
  71 #ifndef _FLAGS
  72
  73   /* --- _flags -- return or output processor flags --- */
  74
  75   #define _flags        (0x10)
  76
  77   /* --- _in and _inr -- input a register, or a range of registers --- */
  78
  79   #define _in(r)        (1u << (r))
  80   #define _inr(ra,rb)   (((~0) << (ra)) ^ ((~0) << ((rb)+1)))
  81
  82   /* --- _out and _outr -- output a register, or a range of registers --- */
  83
  84   #define _out(r)       (1u << (31-((r) == _flags ? 10 : (r))))
  85   #define _outr(ra,rb)  (((~0) << (31-(rb))) ^ ((~0) << (32-(ra))))
  86
  87   /* --- _block -- point a register at block built from arguments --- */
  88
  89   #define _block(r)     (((r) << 12) | 0x800)
  90
  91   /* --- _return -- return register from _swi (not _swix) --- */
  92
  93   #define _return(r)    ((r) == _flags ? 0xF0000 : (r) << 16)
  94
  95   /* --- Constants for ARM processor flags --- */
  96
  97   #define _n            (0x80000000u)
  98   #define _z            (0x40000000u)
  99   #define _c            (0x20000000u)
 100   #define _v            (0x10000000u)
 101
 102   /* --- Acorn style capital-letter macros --- */
 103
 104   #define _FLAGS        _flags
 105   #define _IN(x)        _in(x)
 106   #define _INR(x,y)     _inr(x,y)
 107   #define _OUT(x)       _out(x)
 108   #define _OUTR(x,y)    _outr(x,y)
 109   #define _BLOCK(x)     _block(x)
 110   #define _RETURN(x)    _return(x)
 111   #define _N            _n
 112   #define _Z            _z
 113   #define _C            _c
 114   #define _V            _v
 115
 116 #endif
 117
 118 #ifdef __cplusplus
 119   }
 120 #endif
 121
 122 #endif