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463 lines
17 KiB
Plaintext
463 lines
17 KiB
Plaintext
1File: AS68INIT.C Page 1
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1 /*
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2 Copyright 1981
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3 Alcyon Corporation
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4 8716 Production Ave.
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5 San Diego, Ca. 92121
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6 */
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7
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8 #include "machine.h"
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9 #include "ctype.h"
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10
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11 #ifdef PDP11
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12 struct {
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13 char lobyte;
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14 char hibyte;
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15 };
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16 struct {
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17 char *ptrw1;
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18 char *ptrw2;
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19 };
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20 struct {
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21 int wd1;
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22 int wd2;
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23 };
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24 struct {
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25 int swd1;
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26 };
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27 #endif
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28
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29 #ifdef MC68000
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30 struct {
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31 char hibyte;
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32 char lobyte;
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33 };
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34 struct {
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35 char *ptrw2;
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36 };
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37 struct {
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38 int wd1;
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39 int wd2;
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40 };
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41 struct {
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42 int swd1;
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43 };
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44 #endif
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45
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46 #ifdef VAX
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47 struct {
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48 short wd2;
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49 short wd1;
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50 };
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51 struct {
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52 short swd1;
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53 };
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54
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55 struct {
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56 char lobyte;
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57 char hibyte;
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58 };
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59 struct {
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1File: AS68INIT.C Page 2
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60 char *ptrw2;
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61 };
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62 #endif
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63
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64 /* format of a symbol entry in the main table*/
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65
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66 # define NAMELEN 8 /*length of name in symbol table*/
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67 struct symtab {
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68 char name[NAMELEN]; /*symbol name*/
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69 int flags; /*bit flags*/
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70 char *tlnk; /*table link*/
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71 long vl1; /*symbol value*/
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72 };
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73
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74 struct symtab *symtptr;
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75 # define STESIZE (sizeof *symtptr) /*byte length of symbol table entry*/
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76
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77 /* flags for symbols*/
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78 # define SYDF 0100000 /*defined*/
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79 # define SYEQ 0040000 /*equated*/
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80 # define SYGL 0020000 /*global - entry or external*/
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81 # define SYER 0010000 /*equated register*/
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82 # define SYXR 0004000 /*external reference*/
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83 # define SYRA 0002000 /*DATA based relocatable*/
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84 # define SYRO 0001000 /*TEXT based relocatable*/
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85 # define SYBS 0000400 /*BSS based relocatable*/
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86 # define SYIN 0000200 /*internal symbol -- opcode, directive or equ*/
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87 # define SYPC 0000100 /*[vlh]equated using star '*' expression*/
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88 # define SYRM 0000040 /*[vlh]register mask equate*/
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89
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90 /*flags for opcodes and directives*/
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91 # define OPDR 0100000 /*0=>opcode, 1=>directive*/
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92 # define OPFF 037 /*type of instruction (used as mask)*/
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93
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94 struct irts {
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95 char *irle; /*ptr to last entry in chain*/
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96 char *irfe; /*ptr to first entry in chain*/
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97 };
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98
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99 long stlen; /*length of symbol table*/
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100
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101 /*
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102 * intermediate text file
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103 * format of the intermediate text for one statement:
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104 *
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105 * ******************************************************
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106 * * it type = ITBS * # it entries * 0
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107 * ******************************************************
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108 * * absolute line number (long) *
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109 * ******************************************************
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110 * * it type = ITSY * instr length * 1
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111 * ******************************************************
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112 * * symbol table pointer for stmt label (long) *
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113 * ******************************************************
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114 * * it type = ITSY * instr mode length * 2
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115 * ******************************************************
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116 * * opcode ptr (long) *
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117 * ******************************************************
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118 * * it type = ITCN * relocation base * 3
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1File: AS68INIT.C Page 3
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119 * ******************************************************
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120 * * location counter (pass 1) *
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121 * ******************************************************
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122 * * it type * relocation flag * 4 - oprnds
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123 * ******************************************************
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124 * * value (long) *
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125 * ******************************************************
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126 * .
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127 * .
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128 * .
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129 * ******************************************************
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130 * * it type * relocation flag * n - oprnds
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131 * ******************************************************
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132 * * value (long) *
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133 * ******************************************************
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134 */
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135
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136 #define ITOP1 4 /*first it entry for operands*/
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137
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138 /*
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139 * it type meaning
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140 * 0 beginning of statement
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141 * 1 value is pointer to symbol table
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142 * 2 value is a constant
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143 * 3 value is a specal char
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144 *
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145 * relocation flag for opcode it entry is operand length:
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146 * 'b' => byte
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147 * 'w' => word
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148 * 'l' => long
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149 */
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150
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151 struct it {
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152 char itty; /*it type*/
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153 char itrl; /*relocation flag or # it entries*/
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154 long itop;
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155 };
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156
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157 int mode=0; /*operand mode (byte, word, long)*/
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158 int modelen=0; /*operand length per mode*/
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159 #define BYTE 'b'
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160 #define WORD 'w'
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161 #define LONG 'l'
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162
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163 /* parameters that define the main table*/
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164 #define SZMT 300 /*initial size of the main table */
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165 /*must be large enough to initialize*/
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166 #ifdef PDP11
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167 #define ICRSZMT 10 /*add to main table when run out*/
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168 #else
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169 #define ICRSZMT 50 /*add to main table when run out*/
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170 #endif
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171 int cszmt=0; /*current size of main table*/
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172 char *bmte=0; /*beginning of main table*/
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173 char *emte=0; /*end of main table*/
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174
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175 /* intermediate text types*/
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176 #define ITBS 0 /*beginning of statement*/
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177 #define ITSY 1 /*pointer to symbol table*/
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1File: AS68INIT.C Page 4
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178 #define ITCN 2 /*constant*/
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179 #define ITSP 3 /*special*/
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180 #define ITRM 4 /*[vlh]register mask!*/
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181 #define ITPC 5 /*[vlh]pc relative argument*/
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182
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183 # define ITBSZ 256 /*size of the it buffer*/
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184 int itbuf[ITBSZ]={0}; /*it buffer*/
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185
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186 #define STMAX 200 /*size of intermediate text buffer*/
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187 struct it stbuf[STMAX]={0}; /*holds it for one statement*/
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188
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189 char sbuf[512]={0}; /*holds one block of source*/
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190
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191 /*initial reference table for symbols*/
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192 # define SZIRT 128
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193 char *sirt[SZIRT]={0};
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194
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195 /*initial reference table to opcodes*/
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196 char *oirt[SZIRT]={0};
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197
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198 /*external symbol table*/
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199 #define EXTSZ 512
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200 char *extbl[EXTSZ]={0};
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201 int extindx=0; /*index to external symbol table*/
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202 char **pexti=0; /*ptr to external symbol table*/
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203
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204 int absln=0; /*absolute line number*/
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205 int p2absln=0; /*pass 2 line number*/
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206 int fcflg=0; /*0=>passed an item. 1=>first char*/
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207 int fchr=0; /*first char in term*/
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208 int ifn=0; /*source file descriptor*/
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209 int *pitix=0; /*ptr to it buffer*/
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210 int itwc=0; /*number of words in it buffer*/
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211 struct it *pitw=0; /*ptr to it buffer next entry*/
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212 int itype=0; /*type of item*/
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213 long ival=0; /*value of item*/
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214 char *lblpt=0; /*label pointer*/
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215 char lbt[NAMELEN]={0}; /*holds label name*/
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216 char *lmte=0; /*last entry in main table*/
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217 long loctr=0; /*location counter*/
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218 long savelc[4]={0}; /*save relocation counters for 3 bases*/
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219 int nite=0; /*number of entries in stbuf*/
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220 struct it *pnite=0;
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221 int lfn=0; /*loader output file descriptor*/
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222 char *opcpt=0; /*pointer to opcode entry in main table*/
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223 int p2flg=0; /*0=>pass 1 1=>pass 2*/
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224 char **pirt=0; /*entry in initial reference table*/
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225 int reloc=0; /*relocation value returned by expression evaluator (expr)*/
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226 int rlflg=0; /*relocation value of current location counter*/
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227 /*relocation values*/
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228 # define ABS 0 /*absolute*/
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229 # define DATA 1
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230 # define TEXT 2
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231 # define BSS 3
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232 # define EXTRN 4 /*externally defined*/
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233
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234 #define EOLC '\n' /*end of line character*/
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235 #define EOF 0 /*end of file indicator*/
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236 #define NULL 0 /* [vlh] character null '\0' */
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1File: AS68INIT.C Page 5
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237 #define TRUE 1 /* [vlh] boolean values */
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238 #define FALSE 0 /* [vlh] boolean values */
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239
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240 int format=0;
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241 int sbuflen=0; /*number of chars in sbuf*/
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242 char *psbuf=0; /*ptr into sbuf*/
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243 int itfn=0; /*it file number*/
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244 char itfnc=0; /*last char of it file name*/
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245 int trbfn=0; /*temp for text relocation bits*/
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246 char trbfnc=0; /*last char of text rb file*/
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247 int dafn=0; /*file for data stuff*/
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248 char dafnc=0; /*last char of data file*/
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249 int drbfn=0; /*file for data relocation bits*/
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250 char drbfnc=0; /*last char*/
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251 int prtflg=0; /*print output flag*/
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252 int undflg=0; /*make undefined symbols external flag*/
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253
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254 int starmul=0; /* * is multiply operator*/
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255
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256 char *endptr=0, *addptr=0;
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257 char *orgptr=0;
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258 char *subptr=0, *addiptr=0, *addqptr=0, *subiptr=0, *subqptr=0;
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259 char *cmpptr=0, *addaptr=0, *cmpaptr=0, *subaptr=0, *cmpmptr=0;
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260 char *equptr=0;
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261 char *andptr=0, *andiptr=0, *eorptr=0, *eoriptr=0, *orptr=0, *oriptr=0;
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262 char *cmpiptr=0;
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263 char *moveptr=0, *moveqptr=0;
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264 char *exgptr=0;
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265 char *evenptr=0;
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266 char *jsrptr=0, *bsrptr=0, *nopptr=0;
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267
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268 char peekc=0;
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269 int numcon[2]=0, numsym[2]=0, indir[2]=0, immed[2]=0, numreg[2]=0;
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270 int plevel=0; /*parenthesis level counter*/
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271 int opdix=0; /*operand index counter*/
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272 int p1inlen=0; /*pass 1 instr length*/
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273 int instrlen=0; /*pass 2 bytes in current instruction*/
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274
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275 /* effective address mode bits*/
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276 #define DDIR 000
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277 #define ADIR 010
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278 #define INDIRECT 020
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279 #define INDINC 030
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280 #define DECIND 040
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281 #define INDDISP 050
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282 #define INDINX 060
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283 #define SADDR 070
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284 #define LADDR 071
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285 #define IMM 074
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286
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287 #define AREGLO 8
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288 #define AREGHI 15
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289
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290 /* relocation bit definitions:*/
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291 #define RBMASK 07 /*tells type of relocation*/
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292 #define INSABS 7 /*first word of instr -- absolute*/
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293 #define DABS 0 /*data word absolute*/
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294 #define TRELOC 2 /* TEXT relocatable*/
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295 #define DRELOC 1 /* DATA relocatable*/
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1File: AS68INIT.C Page 6
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296 #define BRELOC 3 /* BSS relocatable*/
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297 #define EXTVAR 4 /* ref to external variable*/
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298 #define LUPPER 5 /* upper word of long*/
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299 #define EXTREL 6 /* external relative mode*/
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300
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301 /* ptrs to ins[] and rlbits[]*/
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302 int *pins=0;
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303 int *prlb=0;
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304 int ins[5]={0}; /*holds instruction words*/
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305
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306 #define PRTCHLEN 128
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307 char prtchars[PRTCHLEN]={0}; /*line buffer for putchar*/
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308 char *prtchidx=0; /*index for putchar*/
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309
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310 int extflg=0, extref=0; /*external in expr*/
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311
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312 #define CCR 16
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313 #define SR 17
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314 #define USP 18
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315 #define MOVECCR 042300
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316 #define MOVESR 043300
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317 #define SRMOVE 040300
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318 #define MOVEUSP 047140
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319
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320 struct op {
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321 int ea; /* effective address bits*/
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322 int len; /* effective address length in bytes*/
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323 long con; /*constant or reloc part of operand*/
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324 int drlc; /*reloc of con*/
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325 int ext; /*external variable #*/
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326 int idx; /*index register if any*/
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327 int xmod; /*mode of index reg*/
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328 } opnd[2]={0};
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329 #define OPSTLEN 10
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330 #define TREELEN 20
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331 struct buf{
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332 int fildes;
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333 int nunused;
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334 char *xfree;
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335 char buff[512];
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336 };
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337
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338 struct buf lbuf={0};
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339 struct buf tbuf={0};
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340 struct buf dabuf={0};
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341 struct buf drbuf={0};
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342
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343 int nerror=0; /*# of assembler errors*/
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344 int in_err=0; /*[vlh] don't generate instrlen err if already err state*/
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345 int shortadr=0; /*short addresses if set*/
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346
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347 #define CLRFOR 24
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348 #define CLRVAL 041000
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349
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350 long itoffset=0;
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351
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352 #define LASTCHTFN tfilname[11]
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353 #define PC 22
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354
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1File: AS68INIT.C Page 7
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355 int equflg=0; /*doing an equate stmt*/
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356
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357 #define ANDI 01000
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358 #define AND 0140000
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359 #define ORI 0
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360 #define OR 0100000
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361 #define EORI 05000
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362 #define EOR 0130000
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363 #define MOVE 0
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364
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365 long lseek();
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366 char *sbrk();
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367 char *lemt();
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368
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369 int refpc=0; /* * referenced in expr*/
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370 #define SOH 1
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371
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372 /* Conditional Assembly variables and constants [vlh] */
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373 #define LOW_CA 21 /* [vlh] */
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374 #define HI_CA 30 /* [vlh] */
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375
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376 int ca_true=0; /* true unless in a false CA*/
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377 int ca=0; /* depth of conditional assembly, none = 0*/
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378 int ca_level=0; /* at what CA depth did CA go false?*/
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379
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380 /* pass 1 global variables */
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381 int numops=0; /*number of operands*/
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382 int inoffset=0; /*[vlh]offset directive*/
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383 int didorg=0;
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384 int initflg=0; /*initialize flag*/
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385
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386 /* defines */
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387 #define igblk() while(fchr==' ') fchr=gchr()
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388 #define ckein() ((pitw >= pnite))
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389
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390 /* is it an alterable operand */
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391 #define memalt(ap) (memea(ap) && altea(ap))
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392 #define dataalt(ap) (dataea(ap) && altea(ap))
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393 #define altea(ap) ((((ap)->ea&070)!=SADDR || ((ap)->ea&6)==0))
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394
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395 /* is it the specific type of operand */
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396 #define memea(ap) (((ap)->ea&070) >= INDIRECT)
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397 #define dataea(ap) (((ap)->ea&070) != ADIR)
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398 #define pcea(ap) ((ap)->ea==072 || (ap)->ea==073)
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399 #define ckdreg(ap) ((ap)->ea>=0 && (ap)->ea<AREGLO)
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400 #define ckareg(ap) ((ap)->ea>=AREGLO && (ap)->ea<=AREGHI)
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401 /*
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402 * DRI Listing Hacks:
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403 */
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404 char *sfname=0; /* -> Source filename */
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405 int xline=0; /* Current line number */
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406 int xpage=0; /* Current page number */
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407 /*
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408 * More Initializations:
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409 */
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410 char *tfilname[80] = {0}; /* Temp filename area */
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411 char *initfnam[80] = {0}; /* Init filename area */
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412 struct it exitm={0};
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413 int prcnt=0;
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1File: AS68INIT.C Page 8
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414 int rval=0;
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415 int lpflg=0;
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416 int lastopr=0;
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417 int rlbits[5]={0};
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418 int pline=0;
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419 int prsp=0;
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420 int amode=0;
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421 long stlen=0;
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422 int udfct=0;
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423 int errno=0;
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424 int nitleft=0;
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425 int hibytflg[4]={0};
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426 int hibytw[4]={0};
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427 struct it *piop=0;
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428 struct it *pitr=0;
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429 struct it opstk[OPSTLEN]={0};
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430 struct it tree[TREELEN]={0};
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431 int chmvq=0;
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432 int explmod=0;
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433 int ftudp=0;
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434 int iop=0;
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435 int itr=0;
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436 char ldfn[40]={0};
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437 int opcval=0;
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438 int poslab=0;
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439 int symcon=0;
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440 char *tfilptr=0;
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441 int tlab1=0;
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442 #define HDSIZE (sizeof couthd) /**.o file header size*/
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443 struct hdr {
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444 short ch_magic; /*c.out magic number 060016 = $600E*/
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445 long ch_tsize; /*text size*/
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446 long ch_dsize; /*data size*/
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447 long ch_bsize; /*bss size*/
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448 long ch_ssize; /*symbol table size*/
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449 long ch_stksize; /*stack size*/
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450 long ch_entry; /*entry point*/
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451 short ch_rlbflg; /*relocation bits suppressed flag*/
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452 } couthd={0};
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453
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454 #define MAGIC 0x601a /* bra .+26 instruction*/
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