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0
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1 /* 6809 Simulator V09.
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2
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3 created 1993,1994 by L.C. Benschop.
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4 copyleft (c) 1994-2014 by the sbc09 team, see AUTHORS for more details.
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5 license: GNU General Public License version 2, see LICENSE for more details.
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6
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7 This program simulates a 6809 processor.
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8
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9 System dependencies: short must be 16 bits.
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10 char must be 8 bits.
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11 long must be more than 16 bits.
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12 arrays up to 65536 bytes must be supported.
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13 machine must be twos complement.
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14 Most Unix machines will work. For MSODS you need long pointers
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15 and you may have to malloc() the mem array of 65536 bytes.
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16
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17 Define BIG_ENDIAN if you have a big-endian machine (680x0 etc)
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18
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19 Special instructions:
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20 SWI2 writes char to stdout from register B.
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21 SWI3 reads char from stdout to register B, sets carry at EOF.
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22 (or when no key available when using term control).
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23 SWI retains its normal function.
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24 CWAI and SYNC stop simulator.
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25
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26 */
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27
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28 #include<stdio.h>
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29 #include<stdlib.h>
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30 #include<ctype.h>
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31 #include<signal.h>
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32 #include<sys/time.h>
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33
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34 #include <unistd.h>
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35 #include <fcntl.h>
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36 #include <string.h>
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37
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38 #ifdef USE_TERMIOS
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39 #include <termios.h>
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40 #endif
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41
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42 #define engine extern
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43 #include "v09.h"
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44
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45 int tflags;
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46 int timer = 1;
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47 struct termios termsetting;
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48
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49 int xmstat; /* 0= no XMODEM transfer, 1=send, 2=receiver */
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50 unsigned char xmbuf[132];
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51 int xidx;
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52 int acknak;
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53 int rcvdnak;
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54 int blocknum;
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55
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56 FILE *logfile;
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57 FILE *infile;
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58 FILE *xfile;
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59
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60 extern void hexadump( unsigned char *b, int l, int loc, int w);
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61 extern void disasm(int,int);
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62
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63
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64 int char_input(void) {
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65 int c, w, sum;
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66 if (!xmstat) {
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67 if (infile) {
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68 c = getc(infile);
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69 if (c == EOF) {
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70 fclose(infile);
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71 infile = 0;
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72 return char_input();
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73 }
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74 if (c == '\n')
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75 c = '\r';
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76 return c;
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77 } else
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78 return getchar();
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79 } else if (xmstat == 1) {
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80 if (xidx) {
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81 c = xmbuf[xidx++];
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82 if (xidx == 132) {
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83 xidx = 0;
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84 rcvdnak = EOF;
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85 acknak = 6;
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86 }
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87 } else {
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88 if ((acknak == 21 && rcvdnak == 21) || (acknak == 6 && rcvdnak == 6)) {
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89 rcvdnak = 0;
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90 memset(xmbuf, 0, 132);
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91 w = fread(xmbuf + 3, 1, 128, xfile);
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92 if (w) {
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93 printf("Block %3d transmitted, ", blocknum);
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94 xmbuf[0] = 1;
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95 xmbuf[1] = blocknum;
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96 xmbuf[2] = 255 - blocknum;
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97 blocknum = (blocknum + 1) & 255;
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98 sum = 0;
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99 for (w = 3; w < 131; w++)
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100 sum = (sum + xmbuf[w]) & 255;
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101 xmbuf[131] = sum;
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102 acknak = 6;
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103 c = 1;
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104 xidx = 1;
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105 } else {
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106 printf("EOT transmitted, ");
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107 acknak = 4;
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108 c = 4;
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109 }
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110 } else if (rcvdnak == 21) {
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111 rcvdnak = 0;
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112 printf("Block %3d retransmitted, ", xmbuf[1]);
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113 c = xmbuf[xidx++]; /*retransmit the same block */
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114 } else
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115 c = EOF;
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116 }
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117 return c;
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118 } else {
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119 if (acknak == 4) {
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120 c = 6;
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121 acknak = 0;
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122 fclose(xfile);
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123 xfile = 0;
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124 xmstat = 0;
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125 } else if (acknak) {
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126 c = acknak;
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127 acknak = 0;
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128 } else
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129 c = EOF;
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130 if (c == 6)
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131 printf("ACK\n");
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132 if (c == 21)
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133 printf("NAK\n");
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134 return c;
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135 }
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136 }
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137
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138 int do_input( a) {
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139 static int c, f = EOF;
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140 if (a == 0) {
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141 if (f == EOF)
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142 f = char_input();
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143 if (f != EOF)
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144 c = f;
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145 return 2 + (f != EOF);
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146 } else if (a == 1) { /*data port*/
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147 if (f == EOF)
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148 f = char_input();
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149 if (f != EOF) {
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150 c = f;
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151 f = EOF;
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152 }
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153 return c;
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154 }
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155 return 0;
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156 }
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157
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158 void do_output(int a, int c) {
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159 int i, sum;
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160 if (a == 1) { /* ACIA data port,ignore address */
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161 if (!xmstat) {
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162 if (logfile && c != 127 && (c >= ' ' || c == '\n'))
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163 putc(c, logfile);
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164 putchar(c);
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165 fflush(stdout);
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166 } else if (xmstat == 1) {
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167 rcvdnak = c;
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168 if (c == 6 && acknak == 4) {
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169 fclose(xfile);
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170 xfile = 0;
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171 xmstat = 0;
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172 }
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173 if (c == 6)
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174 printf("ACK\n");
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175 if (c == 21)
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176 printf("NAK\n");
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177 if (c == 24) {
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178 printf("CAN\n");
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179 fclose(xfile);
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180 xmstat = 0;
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181 xfile = 0;
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182 }
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183 } else {
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184 if (xidx == 0 && c == 4) {
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185 acknak = 4;
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186 printf("EOT received, ");
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187 }
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188 xmbuf[xidx++] = c;
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189 if (xidx == 132) {
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190 sum = 0;
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191 for (i = 3; i < 131; i++)
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192 sum = (sum + xmbuf[i]) & 255;
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193 if (xmbuf[0] == 1 && xmbuf[1] == 255 - xmbuf[2]
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194 && sum == xmbuf[131])
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195 acknak = 6;
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196 else
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197 acknak = 21;
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198 printf("Block %3d received, ", xmbuf[1]);
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199 if (blocknum == xmbuf[1]) {
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200 blocknum = (blocknum + 1) & 255;
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201 fwrite(xmbuf + 3, 1, 128, xfile);
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202 }
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203 xidx = 0;
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204 }
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205 }
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206 }
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207 }
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208
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209 void restore_term(void) {
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210 tcsetattr(0, TCSAFLUSH, &termsetting);
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211 fcntl(0, F_SETFL, tflags);
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212 signal(SIGALRM, SIG_IGN);
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213 }
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214
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215 void do_exit(void) {
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216 restore_term();
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217 exit(0);
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218 }
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219
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220 typedef struct bp {
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221 int address;
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222 int count;
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223 struct bp *next;
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224 } BP, *BPTR;
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225
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226 BPTR breakpoint = 0;
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227 int bpskip = 0;
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228 int trskip = 0;
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229 int stkskip = 0;
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230
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231 int getarg(char *buf, char** next) {
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232 return strtol(buf,(char**)next,0);
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233 }
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234
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235 void printhelp(void)
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236 {
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237 printf(
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238 " s [count] one step trace\n"
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239 " n step over\n"
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240 " f finish this call (until stack pop)\n"
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241 " b [adr] set break point\n"
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242 " l break point list\n"
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243 " d [n] delte break point list\n"
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244 " c [count] continue;\n"
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245 " x [adr] dump\n"
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246 " xi [adr] disassemble\n"
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247 " L file start log to file\n"
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248 " S file set input file\n"
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249 " X exit\n"
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250 " q exit\n"
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251 " U file upload from srecord file \n"
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252 " D file download to srecord file \n"
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253 " R do reset\n"
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254 " h,? print this\n"
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255 );
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256 }
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257
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258 void do_escape(void) {
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259 char s[80];
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260 int adr,skip;
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261 if (bpskip) { // skip unbreak instruction
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262 bpskip--;
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263 for(BPTR b = breakpoint; b ; b=b->next) {
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264 if (pcreg==b->address) {
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265 if (b->count) b->count--;
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266 if (b->count==0) {
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267 goto restart0;
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268 }
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269 }
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270 }
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271 return;
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272 }
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273 if (stkskip) { // skip until return
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274 if (sreg < stkskip ) return;
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275 }
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276 restart0:
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277 stkskip = 0;
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278 restore_term();
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279 do_trace(stdout);
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280 if (trskip>1) { // show trace and step
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281 trskip--;
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282 set_term(escchar);
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283 return;
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284 }
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285 restart:
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286 printf("v09>");
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287 fgets(s, 80, stdin);
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288 if (s[0])
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289 s[strlen(s) - 1] = 0;
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290 switch (s[0]) {
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291 case 's': // one step trace
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292 trskip = 1;
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293 if (s[1]) {
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294 trskip = getarg(s+1,0);
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295 }
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296 bpskip = 0;
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297 attention = escape = 1;
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298 break;
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299 case 'n': // step over
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300 stkskip = sreg;
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301 attention = escape = 1;
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302 break;
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303 case 'f': // finish this call (until stack pop)
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304 stkskip = sreg + 2;
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305 attention = escape = 1;
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306 break;
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307 case 'b': // set break point
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308 {
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309 BPTR bp = calloc(1,sizeof(BP));
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310 bp->next = breakpoint;
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311 breakpoint = bp;
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312 bp->count = 1;
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313 if (s[1]) {
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314 char *next;
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315 bp->address = getarg(s+1,&next);
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316 if (next[0]) {
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317 bp->count = getarg(next,&next);
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318 }
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319 } else {
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320 bp->address = pcreg;
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321 }
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322 }
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323 bpskip = -1;
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324 goto restart;
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325 case 'l': // break point list
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326 for(BPTR bp = breakpoint; bp ; bp = bp->next) {
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327 printf("%x %i\n", bp->address, bp->count);
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328 }
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329 goto restart;
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330 case 'd': // delte break point list
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331 if (s[1]) {
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332 int trskip = getarg(s+1,0);
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333 BPTR *prev = &breakpoint;
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334 for(BPTR bp = breakpoint; bp ; bp = bp->next) {
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335 if (trskip-- == 0) {
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336 if (bp) {
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337 *prev = bp->next;
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338 }
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339 break;
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340 }
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341 prev = &bp->next;
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342 }
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343 }
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344 goto restart;
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345 case 'c': // continue;
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346 bpskip = -1;
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347 attention = escape = 1;
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348 if (s[1]) {
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349 bpskip = getarg(s+1,0);
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350 }
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351 break;
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352 case 'x': // dump
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353 skip = 1;
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354 if (s[1]=='i') skip=2;
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355 if (s[skip]) {
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356 char *next;
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357 int adr = getarg(s+skip,&next);
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358 int len = 32;
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359 if (next[0]) {
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360 len = getarg(next,&next);
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361 }
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362 if (skip==2) {
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363 disasm(adr,adr+len);
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364 } else {
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365 for(int i=0; len > 0 ; i+=16, len-=16) {
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366 hexadump(mem+adr+i,len>16?16:len,adr+i,16);
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367 }
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368 }
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369 } else
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370 disasm(pcreg,pcreg+32);
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371 goto restart;
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372 case 'L':
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373 if (logfile)
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374 fclose(logfile);
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375 logfile = 0;
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376 if (s[1]) {
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377 logfile = fopen(s + 1, "w");
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378 }
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379 break;
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380 case 'S':
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381 if (infile)
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382 fclose(infile);
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383 infile = 0;
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384 if (s[1]) {
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385 infile = fopen(s + 1, "r");
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386 }
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387 break;
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388 case 'h':
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389 case '?':
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390 printhelp();
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391 goto restart;
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392 case 'X':
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393 case 'q':
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394 if (!xmstat)
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395 do_exit();
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396 else {
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397 xmstat = 0;
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398 fclose(xfile);
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399 xfile = 0;
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400 }
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401 break;
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402 case 'U':
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403 if (xfile)
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404 fclose(xfile);
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405 xfile = 0;
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406 if (s[1]) {
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407 xfile = fopen(s + 1, "rb");
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408 }
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409 if (xfile)
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410 xmstat = 1;
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411 else
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412 xmstat = 0;
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413 xidx = 0;
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414 acknak = 21;
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415 rcvdnak = EOF;
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416 blocknum = 1;
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417 break;
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418 case 'D':
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419 if (xfile)
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420 fclose(xfile);
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421 xfile = 0;
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422 if (s[1]) {
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423 xfile = fopen(s + 1, "wb");
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424 }
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425 if (xfile)
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426 xmstat = 2;
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427 else
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428 xmstat = 0;
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429 xidx = 0;
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430 acknak = 21;
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431 blocknum = 1;
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432 break;
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433 case 'R':
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434 pcreg = (mem[0xfffe] << 8) + mem[0xffff];
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435 break;
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436 }
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437 if (tracing||breakpoint||trskip||bpskip||stkskip) { attention = escape = 1; }
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438 else attention = 0;
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439 set_term(escchar);
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440 }
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441
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442 void timehandler(int sig) {
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443 attention = 1;
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444 irq = 2;
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445 signal(SIGALRM, timehandler);
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446 }
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447
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448 void handler(int sig) {
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449 escape = 1;
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450 attention = 1;
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451 bpskip = 0;
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452 stkskip = 0;
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453 }
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454
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455 void set_term(char c) {
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456 struct termios newterm;
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457 struct itimerval timercontrol;
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458 signal(SIGQUIT, SIG_IGN);
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459 signal(SIGTSTP, SIG_IGN);
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460 signal(SIGINT, handler);
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461 signal(SIGUSR1, handler);
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462 tcgetattr(0, &termsetting);
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463 newterm = termsetting;
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464 newterm.c_iflag = newterm.c_iflag & ~INLCR & ~ICRNL;
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465 newterm.c_lflag = newterm.c_lflag & ~ECHO & ~ICANON;
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466 newterm.c_cc[VTIME] = 0;
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467 newterm.c_cc[VMIN] = 1;
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468 newterm.c_cc[VINTR] = escchar;
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469 tcsetattr(0, TCSAFLUSH, &newterm);
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470 tflags = fcntl(0, F_GETFL, 0);
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471 fcntl(0, F_SETFL, tflags | O_NDELAY); /* Make input from stdin non-blocking */
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472 signal(SIGALRM, timehandler);
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473 timercontrol.it_interval.tv_sec = 0;
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474 timercontrol.it_interval.tv_usec = 20000;
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475 timercontrol.it_value.tv_sec = 0;
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476 timercontrol.it_value.tv_usec = 20000;
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477 if (timer)
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478 setitimer(ITIMER_REAL, &timercontrol, NULL);
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479 }
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