annotate src/insn_gen.c @ 4:34568fab6058

Fixed package to include all required files; also added copyright preamble to all source files
author lost
date Sat, 04 Oct 2008 03:14:20 +0000
parents 57495da01900
children 74a3fef7c8d0
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1 /*
4
34568fab6058 Fixed package to include all required files; also added copyright preamble to all source files
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2 insn_gen.c, Copyright © 2008 William Astle
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3
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4 This file is part of LWASM.
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5
34568fab6058 Fixed package to include all required files; also added copyright preamble to all source files
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6 LWASM is free software: you can redistribute it and/or modify it under the
34568fab6058 Fixed package to include all required files; also added copyright preamble to all source files
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7 terms of the GNU General Public License as published by the Free Software
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8 Foundation, either version 3 of the License, or (at your option) any later
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9 version.
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10
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11 This program is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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14 more details.
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15
34568fab6058 Fixed package to include all required files; also added copyright preamble to all source files
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16 You should have received a copy of the GNU General Public License along with
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17 this program. If not, see <http://www.gnu.org/licenses/>.
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18
34568fab6058 Fixed package to include all required files; also added copyright preamble to all source files
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19 Contains code for parsing general addressing modes (IMM+DIR+EXT+IND)
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20 */
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21
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22 #include <ctype.h>
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23 #include "lwasm.h"
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24 #include "instab.h"
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25
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26 extern void insn_indexed_aux(asmstate_t *as, sourceline_t *cl, char **optr, int *b1, int *b2, int *b3);
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27
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28 void insn_gen_aux(asmstate_t *as, sourceline_t *cl, char **optr, int *b1, int *b2, int *b3, int *op)
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29 {
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30 *b1 = *b2 = *b3 = -1;
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31 char *optr2;
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32 int v1, tv, rval;
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33
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34 optr2 = *optr;
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35 while (*optr2 && !isspace(*optr2) && *optr2 != ',') optr2++
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36 ;
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37 if (*optr2 != ',' && **optr != '[')
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38 {
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39 // not indexed
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40 if (**optr == '<')
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41 {
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42 (*optr)++;
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43 rval = eval_expr(as, cl, optr, &v1);
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44 v1 = v1 & 0xffff;
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45 tv = v1 - ((cl -> dpval) << 8);
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46 if (tv < 0 || tv > 0xff)
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47 {
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48 errorp2(ERR_OVERFLOW);
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49 }
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50 v1 = v1 & 0xff;
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51 goto ins_gen_dir;
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52 }
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53 else if (**optr == '>')
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54 {
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55 // extended mode
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56 (*optr)++;
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57 rval = eval_expr(as, cl, optr, &v1);
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58 goto ins_gen_ext;
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59 }
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60 else
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61 {
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62 // eval expr and see how big it is
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63 rval = eval_expr(as, cl, optr, &v1);
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64 v1 = v1 & 0xFFFF;
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65
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66 if (cl -> undef && as -> passnum == 1)
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67 {
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68 cl -> p1f16 = 1;
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69 goto ins_gen_ext;
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70 }
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71
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72 tv = v1 - (cl -> dpval << 8);
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73
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74 if (tv < 0 || tv > 0xff || cl -> p1f16)
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75 goto ins_gen_ext;
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76 else
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77 {
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78 v1 = v1 & 0xff;
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79 goto ins_gen_dir;
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80 }
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81 }
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82 return;
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83 }
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84
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85 *op = instab[cl -> opcode].ops[1];
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86 insn_indexed_aux(as, cl, optr, b1, b2, b3);
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87 return;
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88
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89 ins_gen_dir:
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90 *op = instab[cl -> opcode].ops[0];
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91 // cl -> code_operlen = 1;
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92 cl -> addrmode = OPER_DIR;
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93 if ((v1 & 0xFFFF) > 0xff)
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94 errorp2(ERR_OVERFLOW);
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95 *b1 = (v1);
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96 return;
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97
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98 ins_gen_ext:
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99 *op = instab[cl -> opcode].ops[2];
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100 // cl -> code_operlen = 2;
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101 cl -> addrmode = OPER_EXT;
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102 *b1 = (v1 >> 8);
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103 *b2 = (v1 & 0xff);
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104 return;
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105 }
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106
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107 void insn_gen(asmstate_t *as, sourceline_t *cl, char **optr)
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108 {
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109 int rval;
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110 int v1;
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111 int b1, b2, b3, op;
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112
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113 if (**optr == '#')
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114 {
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115 // immediate mode has perterbations on instruction size
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116 (*optr)++;
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117 emitop(instab[cl -> opcode].ops[3]);
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118 rval = eval_expr(as, cl, optr, &v1);
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119
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120 switch (instab[cl -> opcode].instype)
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121 {
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122 case INSTYPE_GEN8:
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123 case INSTYPE_IMM8:
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124 cl -> addrmode = OPER_IMM8;
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125 // cl -> code_operlen = 1;
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126 emit(v1 & 0xff);
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127 if (v1 < -128 || v1 > 255)
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128 errorp2(ERR_OVERFLOW);
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129 return;
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130
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131 case INSTYPE_GEN:
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132 cl -> addrmode = OPER_IMM16;
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133 // cl -> code_operlen = 2;
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134 emit(v1 >> 8);
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135 emit(v1 & 0xff);
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136 return;
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137
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138 case INSTYPE_GEN32:
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139 cl -> addrmode = OPER_IMM32;
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140 // cl -> code_operlen = 4;
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141 emit(v1 >> 24);
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142 emit((v1 >> 16) & 0xff);
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143 emit((v1 >> 8) & 0xff);
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144 emit(v1 & 0xff);
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145 return;
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146
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147 default:
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148 errorp1(ERR_BADOPER);
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149 return;
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150
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151 }
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152
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153 return;
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154 }
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155 if (instab[cl -> opcode].instype == INSTYPE_IMM8)
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156 {
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157 errorp1(ERR_BADOPER);
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158 return;
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159 }
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160
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161 insn_gen_aux(as, cl, optr, &b1, &b2, &b3, &op);
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162 emitop(op);
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163 if (b1 != -1)
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164 emit(b1);
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165 if (b2 != -1)
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166 emit(b2);
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167 if (b3 != -1)
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168 emit(b3);
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169 }