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

   1 /*
   2  * swiv.h
   3  *
   4  * Interface to SWI veneer
   5  *
   6  * © 1997 Straylight
   7  */
   8
   9 #ifndef ___swis_h
  10 #define ___swis_h
  11
  12 #ifdef __cplusplus
  13   extern "C" {
  14 #endif
  15
  16 #ifndef __kernel_h
  17   #include "kernel.h"
  18 #endif
  19
  20 /* --- SWI veneer functions --- *
  21  *
  22  * Arguments:   int swi == the SWI to call
  23  *              unsigned flags == a definition of the SWIs registers
  24  *
  25  * Returns:     _swi returns the value of the `return' register in the flags
  26  *              _swix returns 0, or a pointer to an error block
  27  *
  28  * Use:         Calls a SWI, passing it a collection of registers, and
  29  *              filling in the registers as given in the function call.
  30  *
  31  *              Order of arguments is as follows:
  32  *
  33  *              Input registers:        One word for each input register
  34  *              Output registers:       Address to store each reg value
  35  *              Flags address:          Address to store PC+flags value
  36  *              Block contents:         Build contents of local block at end
  37  */
  38
  39 extern int _swi(int /*swi*/, unsigned /*flags*/,...);
  40 extern _kernel_oserror *_swix(int /*swi*/, unsigned /*flags*/,...);
  41
  42 /* --- Various flags settings --- *
  43  *
  44  * _in(n) -- declare Rn as an input register
  45  * _inr(m, n) -- declare Rm--Rn as input registers
  46  * _out(n) -- declare Rn as an output register
  47  * _outr(m, n) -- declare Rm--Rn as output registers
  48  * _return(n) -- return Rn from _swi
  49  * _block(n) -- point Rn at block containing remaining arguments
  50  */
  51
  52 #ifndef _FLAGS
  53
  54   /* --- _flags -- return or output processor flags --- */
  55
  56   #define _flags        (0x10)
  57
  58   /* --- _in and _inr -- input a register, or a range of registers --- */
  59
  60   #define _in(r)        (1u << (r))
  61   #define _inr(ra,rb)   (((~0) << (ra)) ^ ((~0) << ((rb)+1)))
  62
  63   /* --- _out and _outr -- output a register, or a range of registers --- */
  64
  65   #define _out(r)       (1u << (31-((r) == _flags ? 10 : (r))))
  66   #define _outr(ra,rb)  (((~0) << (31-(rb))) ^ ((~0) << (32-(ra))))
  67
  68   /* --- _block -- point a register at block built from arguments --- */
  69
  70   #define _block(r)     (((r) << 12) | 0x800)
  71
  72   /* --- _return -- return register from _swi (not _swix) --- */
  73
  74   #define _return(r)    ((r) == _flags ? 0xF0000 : (r) << 16)
  75
  76   /* --- Constants for ARM processor flags --- */
  77
  78   #define _n            (0x80000000u)
  79   #define _z            (0x40000000u)
  80   #define _c            (0x20000000u)
  81   #define _v            (0x10000000u)
  82
  83   /* --- Acorn style capital-letter macros --- */
  84
  85   #define _FLAGS        _flags
  86   #define _IN(x)        _in(x)
  87   #define _INR(x,y)     _inr(x,y)
  88   #define _OUT(x)       _out(x)
  89   #define _OUTR(x,y)    _outr(x,y)
  90   #define _BLOCK(x)     _block(x)
  91   #define _RETURN(x)    _return(x)
  92   #define _N            _n
  93   #define _Z            _z
  94   #define _C            _c
  95   #define _V            _v
  96
  97 #endif
  98
  99 #ifdef __cplusplus
 100   }
 101 #endif
 102
 103 #endif