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1 /* 6809 Simulator V09.
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2
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3 Copyright 1994, L.C. Benschop, Eidnhoven The Netherlands.
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4 This version of the program is distributed under the terms and conditions
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5 of the GNU General Public License version 2. See the file COPYING.
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6 THERE IS NO WARRANTY ON THIS PROGRAM!!!
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7
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8 This program simulates a 6809 processor.
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9
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10 System dependencies: short must be 16 bits.
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11 char must be 8 bits.
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12 long must be more than 16 bits.
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13 arrays up to 65536 bytes must be supported.
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14 machine must be twos complement.
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15 Most Unix machines will work. For MSODS you need long pointers
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16 and you may have to malloc() the mem array of 65536 bytes.
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17
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18 Define BIG_ENDIAN if you have a big-endian machine (680x0 etc)
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19
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20 Special instructions:
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21 SWI2 writes char to stdout from register B.
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22 SWI3 reads char from stdout to register B, sets carry at EOF.
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23 (or when no key available when using term control).
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24 SWI retains its normal function.
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25 CWAI and SYNC stop simulator.
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26
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27 */
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28
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29
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30 #include <stdio.h>
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31 #include <stdlib.h>
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32 #include <strings.h>
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33 #include <sys/stat.h>
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34
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35 #define engine extern
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36
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37 #include "v09.h"
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38
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39 FILE *tracefile;
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40
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41 extern FILE *fp;
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42 extern char *prog;
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43 extern void disasm(int,int);
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44
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45 void do_trace(FILE *tracefile)
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46 {
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47 Word pc=pcreg;
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48 Byte ir;
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49 // fprintf(tracefile,"pc=%04x ",pc);
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50 // ir=mem[pc++];
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51 // fprintf(tracefile,"i=%02x ",ir); if((ir&0xfe)==0x10) fprintf(tracefile,"%02x ",mem[pc]);else
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52 // fprintf(tracefile," ");
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53 fprintf(tracefile,"x=%04x y=%04x u=%04x s=%04x a=%02x b=%02x cc=%02x pc=",
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54 xreg,yreg,ureg,sreg,*areg,*breg,ccreg);
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55 fp = tracefile;
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56 prog = (char*)mem;
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57 disasm(pc,pc);
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58 }
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59
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60 char *romfile = "v09.rom";
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61 int romstart = 0x8000;
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62
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63 long
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64 filesize(FILE *image)
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65 {
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66 struct stat buf;
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67 fstat(fileno(image),&buf);
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68 return buf.st_size;
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69 }
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70
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71
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72 void
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73 read_image()
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74 {
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75 FILE *image;
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76 if((image=fopen(romfile,"rb"))==NULL)
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77 if((image=fopen("../v09.rom","rb"))==NULL)
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78 if((image=fopen("..\\v09.rom","rb"))==NULL) {
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79 perror("v09, image file");
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80 exit(2);
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81 }
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82 long len = filesize(image);
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83 fread(mem+romstart,len,1,image);
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84 fclose(image);
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85 }
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86
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87 void usage(void)
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88 {
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89 fprintf(stderr,"Usage: v09 [-l romstart] [-rom rom-image] [-t tracefile [-tl addr] [-nt]"
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90 "[-th addr] ]\n[-e escchar] \n");
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91 exit(1);
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92 }
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93
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94
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95 #define CHECKARG if(i==argc)usage();else i++;
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96
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97 int
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98 main(int argc,char *argv[])
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99 {
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100 Word loadaddr=0x100;
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101 char *imagename=0;
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102 int i;
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103 int setterm = 1;
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104 escchar='\x1d';
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105 tracelo=0;tracehi=0xffff;
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106 for(i=1;i<argc;i++) {
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107 if (strcmp(argv[i],"-t")==0) {
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108 i++;
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109 if((tracefile=fopen(argv[i],"w"))==NULL) {
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110 perror("v09, tracefile");
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111 exit(2);
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112 }
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113 tracing=1;attention=1;
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114 } else if (strcmp(argv[i],"-rom")==0) {
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115 i++;
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116 romfile = argv[i];
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117 } else if (strcmp(argv[i],"-tl")==0) {
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118 i++;
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119 tracelo=strtol(argv[i],(char**)0,0);
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120 } else if (strcmp(argv[i],"-th")==0) {
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121 i++;
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122 tracehi=strtol(argv[i],(char**)0,0);
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123 } else if (strcmp(argv[i],"-e")==0) {
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124 i++;
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125 escchar=strtol(argv[i],(char**)0,0);
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126 } else if (strcmp(argv[i],"-l")==0) {
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127 i++;
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128 romstart=strtol(argv[i],(char**)0,0);
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129 } else if (strcmp(argv[i],"-nt")==0) {
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130 attention = escape = 1;
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131 timer = 0;
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132 } else usage();
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133 }
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134 #ifdef MSDOS
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135 if((mem=farmalloc(65535))==0) {
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136 fprintf(stderr,"Not enough memory\n");
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137 exit(2);
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138 }
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139 #endif
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140 read_image();
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141 if (setterm) set_term(escchar);
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142 pcreg=(mem[0xfffe]<<8)+mem[0xffff];
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143 interpr();
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144 return 0;
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145 }
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146
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