miscemu/emulate.c

   1 #include <stdlib.h>
   2 #include <stdio.h>
   3 #include "wine.h"
   4 #include "miscemu.h"
   5 #include "registers.h"
   6 #include "stddebug.h"
   7 /* #define DEBUG_INT */
   8 #include "debug.h"
   9
  10 struct Win87EmInfoStruct
  11 {
  12     unsigned short Version;
  13     unsigned short SizeSaveArea;
  14     unsigned short WinDataSeg;
  15     unsigned short WinCodeSeg;
  16     unsigned short Have80x87;
  17     unsigned short Unused;
  18 };
  19
  20 /* Implementing this is easy cause Linux and *BSD* ALWAYS have a numerical
  21  * coprocessor. (either real or emulated on kernellevel)
  22  */
  23 /* win87em.dll also sets interrupt vectors: 2 (NMI), 0x34 - 0x3f (emulator
  24  * calls of standard libraries, see Ralph Browns interrupt list), 0x75
  25  * (int13 error reporting of coprocessor)
  26  */
  27
  28 /* have a look at /usr/src/linux/arch/i386/math-emu/ *.[ch] for more info
  29  * especially control_w.h and status_w.h
  30  */
  31 /* FIXME: Only skeletal implementation for now */
  32
  33 void WIN87_fpmath( struct sigcontext_struct context )
  34 {
  35     dprintf_int(stddeb, "_fpmath: (cs:eip=%x:%lx es=%x bx=%04x ax=%04x dx==%04x)\n",
  36                  CS_reg(&context), EIP_reg(&context),
  37                  ES_reg(&context), BX_reg(&context),
  38                  AX_reg(&context), DX_reg(&context) );
  39
  40     switch(BX_reg(&context))
  41     {
  42     case 0: /* install (increase instanceref) emulator, install NMI vector */
  43         AX_reg(&context) = 0;
  44         break;
  45
  46     case 1: /* Init Emulator */
  47         AX_reg(&context) = 0;
  48         break;
  49
  50     case 2: /* deinstall emulator (decrease instanceref), deinstall NMI vector
  51              * if zero. Every '0' call should have a matching '2' call.
  52              */
  53         AX_reg(&context) = 0;
  54         break;
  55
  56     case 3:
  57         /*INT_SetHandler(0x3E,MAKELONG(AX,DX));*/
  58         break;
  59
  60     case 4: /* set control word (& ~(CW_Denormal|CW_Invalid)) */
  61         /* OUT: newset control word in AX */
  62         break;
  63
  64     case 5: /* return internal control word in AX */
  65         break;
  66
  67     case 6: /* round top of stack to integer using method AX & 0x0C00 */
  68         /* returns current controlword */
  69         break;
  70
  71     case 7: /* POP top of stack as integer into DX:AX */
  72         /* IN: AX&0x0C00 rounding protocol */
  73         /* OUT: DX:AX variable popped */
  74         {
  75             DWORD dw=0;
  76             /* I don't know much about asm() programming. This could be
  77              * wrong.
  78              */
  79 /* FIXME: could someone who really understands asm() fix this please? --AJ */
  80 /*            __asm__("fistp %0;wait" : "=m" (dw) : : "memory"); */
  81             dprintf_int(stddeb,"emulate.c:On top of stack was %ld\n",dw);
  82             AX_reg(&context) = LOWORD(dw);
  83             DX_reg(&context) = HIWORD(dw);
  84         }
  85         break;
  86
  87     case 8: /* restore internal control words from emulator control word */
  88         break;
  89
  90     case 9: /* clear emu control word and some other things */
  91         break;
  92
  93     case 10: /* dunno. but looks like returning nr. of things on stack in AX */
  94         AX_reg(&context) = 0;
  95         break;
  96
  97     case 11: /* just returns the installed flag in DX:AX */
  98         DX_reg(&context) = 0;
  99         AX_reg(&context) = 1;
 100         break;
 101
 102     case 12: /* save AX in some internal state var */
 103         break;
 104
 105     default: /* error. Say that loud and clear */
 106         AX_reg(&context) = DX_reg(&context) = 0xFFFF;
 107         break;
 108     }
 109 }
 110
 111
 112 void
 113 WIN87_WinEm87Info(struct Win87EmInfoStruct *pWIS, int cbWin87EmInfoStruct)
 114 {
 115   dprintf_int(stddeb, "__WinEm87Info(%p,%d)\n",pWIS,cbWin87EmInfoStruct);
 116 }
 117
 118 void
 119 WIN87_WinEm87Restore(void *pWin87EmSaveArea, int cbWin87EmSaveArea)
 120 {
 121   dprintf_int(stddeb, "__WinEm87Restore(%p,%d)\n",
 122         pWin87EmSaveArea,cbWin87EmSaveArea);
 123 }
 124
 125 void
 126 WIN87_WinEm87Save(void *pWin87EmSaveArea, int cbWin87EmSaveArea)
 127 {
 128   dprintf_int(stddeb, "__WinEm87Save(%p,%d)\n",
 129         pWin87EmSaveArea,cbWin87EmSaveArea);
 130 }