miscemu/emulate.c

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