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339
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1 /*
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2 insn_gen.c, Copyright © 2009 William Astle
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3
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4 This file is part of LWASM.
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5
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6 LWASM is free software: you can redistribute it and/or modify it under the
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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
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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
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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 <config.h>
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23
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24 #include <ctype.h>
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25 #include <stdlib.h>
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26
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361
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27 #include <lw_expr.h>
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28
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339
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29 #include "lwasm.h"
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30 #include "instab.h"
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31
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361
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32 extern void insn_indexed_parse_aux(asmstate_t *as, line_t *l, char **p);
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33 extern void insn_indexed_resolve_aux(asmstate_t *as, line_t *l, int force);
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34 extern void insn_indexed_emit_aux(asmstate_t *as, line_t *l);
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339
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35
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36 // "extra" is required due to the way OIM, EIM, TIM, and AIM work
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361
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37 void insn_parse_gen_aux(asmstate_t *as, line_t *l, char **p)
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339
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38 {
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39 const char *optr2;
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40 int v1, tv, rval;
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361
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41 lw_expr_t *s;
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339
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42
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361
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43 optr2 = *p;
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339
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44 while (*optr2 && !isspace(*optr2) && *optr2 != ',') optr2++
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45 /* do nothing */ ;
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46
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361
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47 if (*optr2 == ',' || **p == '[')
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339
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48 {
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361
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49 l -> lint = -1;
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50 l -> lint2 = 1;
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51 insn_parse_indexed_aux(as, l, p);
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52 goto out;
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53 }
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339
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54
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361
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55 if (**p == '<')
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56 {
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57 (*p)++;
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58 l -> lint2 = 0;
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59 }
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60
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61 // for compatibility with asxxxx
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62 // * followed by a digit, alpha, or _, or ., or ?, or another * is "f8"
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63 else if (**p == '*')
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64 {
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65 tv = *(*p + 1);
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66 if (isdigit(tv) || isalpha(tv) || tv == '_' || tv == '.' || tv == '?' || tv == '@' || tv == '*' || tv == '+' || tv == '-')
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339
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67 {
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361
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68 l -> lint2 = 0;
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69 (*p)++;
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339
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70 }
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361
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71 }
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72 else if (**p == '>')
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73 {
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74 (*p)++;
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75 l -> lint2 = 2;
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76 }
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77 else
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78 {
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79 l -> lint2 = -1;
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80 }
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81
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82 s = lwasm_parse_expr(as, p);
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83 if (!s)
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84 {
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85 lwasm_register_error(as, l, "Bad operand");
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86 return;
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87 }
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88
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89 lwasm_save_expr(l, 0, s);
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90
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91 if (as -> output_format == OUTPUT_OBJ && l -> lint2 == -1)
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92 {
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93 l -> lint2 = 2;
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94 goto out;
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95 }
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96
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97 // if we have a constant now, figure out dp vs nondp
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98 if (lw_expr_istype(s, lw_expr_type_int))
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99 {
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100 v1 = lw_expr_intval(s);
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101 if (((v1 >> 8) & 0xff) == (l -> dpval & 0xff))
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339
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102 {
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361
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103 l -> lint2 = 0;
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104 goto out;
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339
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105 }
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361
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106 l -> lint2 = 2;
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107 }
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108
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109 out:
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110 if (l -> lint2 != -1)
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111 {
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112 if (l -> lint2 == 0)
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113 {
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114 l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
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115 }
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116 else if (l -> lint2 == 2)
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117 {
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118 l -> len = OPLEN(instab[l -> insn].ops[2]) + 2;
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119 }
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120 else if (l -> lint2 == 1 && l -> lint != -1)
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339
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121 {
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361
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122 l -> len = OPLEN(instab[l -> insn].ops[1]) + l -> lint + 1;
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339
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123 }
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361
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124 }
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125 }
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339
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126
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361
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127 void insn_resolve_gen_aux(asmstate_t *as, line_t *l, int force)
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128 {
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129 lw_expr_t *e;
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130
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131 if (l -> lint2 == 1)
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132 {
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133 // indexed
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134 insn_resolve_indexed_aux(as, l, force);
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135 goto out;
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136 }
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137
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138 if (l -> lint2 != -1)
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139 return;
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140
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141 e = lwasm_fetch_expr(l, 0);
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142 if (lw_expr_istype(e, lw_expr_type_int))
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143 {
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144 int v;
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339
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145
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361
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146 v = lw_expr_intval(e);
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147
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148 if (((v >> 8) & 0xff) == (l -> dpval & 0xff))
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339
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149 {
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361
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150 l -> lint2 = 0;
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151 goto out;
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339
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152 }
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361
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153 l -> lint2 = 2;
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154 goto out;
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155 }
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156
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157 if (force)
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158 {
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159 l -> lint2 = 2;
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160 }
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161
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162 out:
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163 if (l -> lint2 != -1)
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164 {
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165 if (l -> lint2 == 0)
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166 {
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167 l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
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168 }
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169 else if (l -> lint2 == 2)
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339
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170 {
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361
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171 l -> len = OPLEN(instab[l -> insn].ops[2]) + 2;
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339
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172 }
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361
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173 else if (l -> lint2 == 1 && l -> lint != -1)
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174 {
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175 l -> len = OPLEN(instab[l -> insn].ops[1]) + l -> lint + 1;
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176 }
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177 }
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178 }
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339
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179
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361
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180 void insn_emit_gen_aux(asmstate_t *as, line_t *l)
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181 {
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182 lw_expr_t e;
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183
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184 e = lwasm_fetch_expr(l, 0);
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185 lwasm_emitop(l, instab[l -> insn].ops[l -> lint2]);
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186 if (l, l -> lint2 == 1)
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187 {
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188 lwasm_emit(l, l -> pb);
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189 lwasm_emitexpr(l, e, l -> lint);
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190 return;
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191 }
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192
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193 if (l -> lint2 == 2)
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194 lwasm_emitexpr(l, e, 2);
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195 else
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196 lwasm_emitexpr(l, e, 1);
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339
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197 }
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198
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199 // the various insn_gen? functions have an immediate mode of ? bits
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361
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200 PARSEFUNC(insn_parse_gen0)
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339
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201 {
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202 if (**p == '#')
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203 {
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361
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204 lwasm_register_error(as, l, "Immediate mode not allowed");
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339
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205 return;
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206 }
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207
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208 // handle non-immediate
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361
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209 insn_parse_gen_aux(as, l, p);
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339
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210 }
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211
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361
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212 RESOLVEFUNC(insn_resolve_gen0)
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339
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213 {
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361
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214 if (l -> len != -1)
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215 return;
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216
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217 // handle non-immediate
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218 insn_resolve_gen_aux(as, l, force);
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219 }
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220
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221 EMITFUNC(insn_emit_gen0)
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222 {
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223 insn_emit_gen_aux(as, l);
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224 }
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225
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226 PARSEFUNC(insn_parse_gen8)
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227 {
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339
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228 if (**p == '#')
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229 {
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361
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230 lw_expr_t e;
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231
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339
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232 (*p)++;
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361
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233 e = lwasm_parse_expr(as, p);
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234 if (!e)
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339
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235 {
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361
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236 lwasm_register_error(as, l, "Bad operand");
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237 return;
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339
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238 }
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361
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239 l -> len = OPLEN(instab[l -> insn].ops[3]) + 1;
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240 l -> lint2 = 3;
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241 lwasm_save_expr(l, 0, e);
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339
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242 return;
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243 }
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244
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361
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245 // handle non-immediate
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246 insn_parse_gen_aux(as, l, p);
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247 if (l -> lint2 != -1)
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248 {
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249 if (l -> lint2 == 0)
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250 {
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251 l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
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252 }
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253 else if (l -> lint2 == 2)
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254 {
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255 l -> len = OPLEN(instab[l -> insn].ops[2]) + 2;
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256 }
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257 else if (l -> lint2 == 1 && l -> lint != -1)
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258 {
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259 l -> len = OPLEN(instab[l -> insn].ops[1]) + l -> lint + 1;
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260 }
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261 }
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339
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262 }
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263
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361
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264 RESOLVEFUNC(insn_resolve_gen8)
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265 {
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266 if (l -> len != -1)
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267 return;
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268
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269 // handle non-immediate
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270 insn_resolve_gen_aux(as, l, force);
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271 }
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272
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273 EMITFUNC(insn_emit_gen8)
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339
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274 {
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361
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275 if (l -> lint2 == 3)
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276 {
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277 lw_expr_t e;
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278 e = lwasm_fetch_expr(l, 0);
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279 lwasm_emitop(l, instab[l -> insn].ops[3]);
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280 lwasm_emitexpr(l, e, 1);
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281 return;
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282 }
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283
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284 insn_emit_gen_aux(as, l);
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285 }
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286
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287 PARSEFUNC(insn_parse_gen16)
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288 {
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339
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289 if (**p == '#')
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290 {
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361
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291 lw_expr_t e;
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292
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339
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293 (*p)++;
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361
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294 e = lwasm_parse_expr(as, p);
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295 if (!e)
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339
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296 {
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361
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297 lwasm_register_error(as, l, "Bad operand");
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298 return;
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339
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299 }
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361
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300 l -> len = OPLEN(instab[l -> insn].ops[3]) + 2;
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301 l -> lint2 = 3;
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302 lwasm_save_expr(l, 0, e);
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339
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303 return;
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304 }
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305
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361
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306 // handle non-immediate
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307 insn_parse_gen_aux(as, l, p);
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308 if (l -> lint2 != -1)
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309 {
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310 if (l -> lint2 == 0)
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311 {
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312 l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
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313 }
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314 else if (l -> lint2 == 2)
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315 {
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316 l -> len = OPLEN(instab[l -> insn].ops[2]) + 2;
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317 }
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318 else if (l -> lint2 == 1 && l -> lint != -1)
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319 {
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320 l -> len = OPLEN(instab[l -> insn].ops[1]) + l -> lint + 1;
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321 }
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322 }
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339
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323 }
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324
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361
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325 RESOLVEFUNC(insn_resolve_gen16)
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326 {
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327 if (l -> len != -1)
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328 return;
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329
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330 // handle non-immediate
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331 insn_resolve_gen_aux(as, l, force);
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332 }
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333
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334 EMITFUNC(insn_emit_gen16)
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339
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335 {
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361
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336 if (l -> lint2 == 3)
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337 {
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338 lw_expr_t e;
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339 e = lwasm_fetch_expr(l, 0);
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340 lwasm_emitop(l, instab[l -> insn].ops[3]);
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341 lwasm_emitexpr(l, e, 2);
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342 return;
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343 }
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344
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345 insn_emit_gen_aux(as, l);
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346 }
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347
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348 PARSEFUNC(insn_parse_gen32)
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349 {
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339
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350 if (**p == '#')
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351 {
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361
|
352 lw_expr_t e;
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353
|
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339
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354 (*p)++;
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361
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355 e = lwasm_parse_expr(as, p);
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356 if (!e)
|
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339
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357 {
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361
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358 lwasm_register_error(as, l, "Bad operand");
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359 return;
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339
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360 }
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361
|
361 l -> len = OPLEN(instab[l -> insn].ops[3]) + 4;
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362 l -> lint2 = 3;
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363 lwasm_save_expr(l, 0, e);
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339
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364 return;
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|
365 }
|
|
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366
|
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361
|
367 // handle non-immediate
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368 insn_parse_gen_aux(as, l, p);
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369 if (l -> lint2 != -1)
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370 {
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371 if (l -> lint2 == 0)
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372 {
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373 l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
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374 }
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375 else if (l -> lint2 == 2)
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376 {
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377 l -> len = OPLEN(instab[l -> insn].ops[2]) + 2;
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378 }
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379 else if (l -> lint2 == 1 && l -> lint != -1)
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380 {
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381 l -> len = OPLEN(instab[l -> insn].ops[1]) + l -> lint + 1;
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382 }
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383 }
|
|
339
|
384 }
|
|
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385
|
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361
|
386 RESOLVEFUNC(insn_resolve_gen32)
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|
|
387 {
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388 if (l -> len != -1)
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|
389 return;
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|
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390
|
|
|
391 // handle non-immediate
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|
|
392 insn_resolve_gen_aux(as, l, force);
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|
|
393 }
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|
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394
|
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395 EMITFUNC(insn_emit_gen32)
|
|
339
|
396 {
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|
361
|
397 if (l -> lint2 == 3)
|
|
|
398 {
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|
|
399 lw_expr_t e;
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|
400 e = lwasm_fetch_expr(l, 0);
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|
401 lwasm_emitop(l, instab[l -> insn].ops[3]);
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|
402 lwasm_emitexpr(l, e, 4);
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|
403 return;
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|
404 }
|
|
|
405
|
|
|
406 insn_emit_gen_aux(as, l);
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|
|
407 }
|
|
|
408
|
|
|
409 PARSEFUNC(insn_parse_imm8)
|
|
|
410 {
|
|
|
411 lw_expr_t e;
|
|
339
|
412
|
|
|
413 if (**p == '#')
|
|
|
414 {
|
|
|
415 (*p)++;
|
|
|
416
|
|
361
|
417 e = lwasm_parse_expr(as, p);
|
|
|
418 if (!e)
|
|
|
419 {
|
|
|
420 lwasm_register_error(as, l, "Bad operand");
|
|
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421 return;
|
|
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422 }
|
|
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423 l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
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|
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424 lwasm_save_expr(l, 0, e);
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|
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425 }
|
|
|
426 }
|
|
339
|
427
|
|
361
|
428 EMITFUNC(insn_emit_imm8)
|
|
|
429 {
|
|
|
430 lw_expr_t e;
|
|
|
431
|
|
|
432 lwasm_emitop(l, instab[l -> insn].ops[0]);
|
|
|
433 lwasm_emitexpr(l, e, 1);
|
|
339
|
434 }
|
