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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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362
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180 void insn_emit_gen_aux(asmstate_t *as, line_t *l, int extra)
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361
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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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362
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186
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187 if (extra != -1)
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188 lwasm_emit(l, extra);
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189
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361
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190 if (l, l -> lint2 == 1)
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191 {
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192 lwasm_emit(l, l -> pb);
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193 lwasm_emitexpr(l, e, l -> lint);
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194 return;
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195 }
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196
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197 if (l -> lint2 == 2)
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198 lwasm_emitexpr(l, e, 2);
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199 else
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200 lwasm_emitexpr(l, e, 1);
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339
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201 }
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202
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203 // the various insn_gen? functions have an immediate mode of ? bits
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361
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204 PARSEFUNC(insn_parse_gen0)
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339
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205 {
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206 if (**p == '#')
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207 {
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361
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208 lwasm_register_error(as, l, "Immediate mode not allowed");
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339
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209 return;
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210 }
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211
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212 // handle non-immediate
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361
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213 insn_parse_gen_aux(as, l, p);
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339
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214 }
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215
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361
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216 RESOLVEFUNC(insn_resolve_gen0)
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339
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217 {
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361
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218 if (l -> len != -1)
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219 return;
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220
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221 // handle non-immediate
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222 insn_resolve_gen_aux(as, l, force);
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223 }
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224
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225 EMITFUNC(insn_emit_gen0)
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226 {
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362
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227 insn_emit_gen_aux(as, l, -1);
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361
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228 }
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229
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230 PARSEFUNC(insn_parse_gen8)
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231 {
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339
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232 if (**p == '#')
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233 {
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361
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234 lw_expr_t e;
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235
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339
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236 (*p)++;
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361
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237 e = lwasm_parse_expr(as, p);
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238 if (!e)
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339
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239 {
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361
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240 lwasm_register_error(as, l, "Bad operand");
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241 return;
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339
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242 }
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361
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243 l -> len = OPLEN(instab[l -> insn].ops[3]) + 1;
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244 l -> lint2 = 3;
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245 lwasm_save_expr(l, 0, e);
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339
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246 return;
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247 }
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248
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361
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249 // handle non-immediate
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250 insn_parse_gen_aux(as, l, p);
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251 if (l -> lint2 != -1)
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252 {
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253 if (l -> lint2 == 0)
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254 {
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255 l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
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256 }
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257 else if (l -> lint2 == 2)
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258 {
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259 l -> len = OPLEN(instab[l -> insn].ops[2]) + 2;
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260 }
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261 else if (l -> lint2 == 1 && l -> lint != -1)
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262 {
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263 l -> len = OPLEN(instab[l -> insn].ops[1]) + l -> lint + 1;
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264 }
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265 }
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339
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266 }
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267
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361
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268 RESOLVEFUNC(insn_resolve_gen8)
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269 {
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270 if (l -> len != -1)
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271 return;
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272
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273 // handle non-immediate
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274 insn_resolve_gen_aux(as, l, force);
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275 }
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276
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277 EMITFUNC(insn_emit_gen8)
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339
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278 {
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361
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279 if (l -> lint2 == 3)
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280 {
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281 lw_expr_t e;
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282 e = lwasm_fetch_expr(l, 0);
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283 lwasm_emitop(l, instab[l -> insn].ops[3]);
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284 lwasm_emitexpr(l, e, 1);
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285 return;
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286 }
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287
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362
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288 insn_emit_gen_aux(as, l, -1);
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361
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289 }
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290
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291 PARSEFUNC(insn_parse_gen16)
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292 {
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339
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293 if (**p == '#')
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294 {
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361
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295 lw_expr_t e;
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296
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339
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297 (*p)++;
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361
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298 e = lwasm_parse_expr(as, p);
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299 if (!e)
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339
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300 {
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361
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301 lwasm_register_error(as, l, "Bad operand");
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302 return;
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339
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303 }
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361
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304 l -> len = OPLEN(instab[l -> insn].ops[3]) + 2;
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305 l -> lint2 = 3;
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306 lwasm_save_expr(l, 0, e);
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339
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307 return;
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308 }
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309
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361
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310 // handle non-immediate
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311 insn_parse_gen_aux(as, l, p);
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312 if (l -> lint2 != -1)
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313 {
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314 if (l -> lint2 == 0)
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315 {
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316 l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
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317 }
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318 else if (l -> lint2 == 2)
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319 {
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320 l -> len = OPLEN(instab[l -> insn].ops[2]) + 2;
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321 }
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322 else if (l -> lint2 == 1 && l -> lint != -1)
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323 {
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324 l -> len = OPLEN(instab[l -> insn].ops[1]) + l -> lint + 1;
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325 }
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326 }
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339
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327 }
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328
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361
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329 RESOLVEFUNC(insn_resolve_gen16)
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330 {
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331 if (l -> len != -1)
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332 return;
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333
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334 // handle non-immediate
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335 insn_resolve_gen_aux(as, l, force);
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336 }
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337
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338 EMITFUNC(insn_emit_gen16)
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339
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339 {
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361
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340 if (l -> lint2 == 3)
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341 {
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342 lw_expr_t e;
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343 e = lwasm_fetch_expr(l, 0);
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344 lwasm_emitop(l, instab[l -> insn].ops[3]);
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345 lwasm_emitexpr(l, e, 2);
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346 return;
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347 }
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348
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362
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349 insn_emit_gen_aux(as, l, -1);
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361
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350 }
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351
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352 PARSEFUNC(insn_parse_gen32)
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353 {
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339
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354 if (**p == '#')
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355 {
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361
|
356 lw_expr_t e;
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357
|
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339
|
358 (*p)++;
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361
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359 e = lwasm_parse_expr(as, p);
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360 if (!e)
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339
|
361 {
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361
|
362 lwasm_register_error(as, l, "Bad operand");
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363 return;
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339
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364 }
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|
361
|
365 l -> len = OPLEN(instab[l -> insn].ops[3]) + 4;
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366 l -> lint2 = 3;
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|
367 lwasm_save_expr(l, 0, e);
|
|
339
|
368 return;
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369 }
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|
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370
|
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361
|
371 // handle non-immediate
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372 insn_parse_gen_aux(as, l, p);
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|
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373 if (l -> lint2 != -1)
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374 {
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375 if (l -> lint2 == 0)
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376 {
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|
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377 l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
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378 }
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379 else if (l -> lint2 == 2)
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380 {
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381 l -> len = OPLEN(instab[l -> insn].ops[2]) + 2;
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382 }
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383 else if (l -> lint2 == 1 && l -> lint != -1)
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384 {
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385 l -> len = OPLEN(instab[l -> insn].ops[1]) + l -> lint + 1;
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386 }
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387 }
|
|
339
|
388 }
|
|
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389
|
|
361
|
390 RESOLVEFUNC(insn_resolve_gen32)
|
|
|
391 {
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|
|
392 if (l -> len != -1)
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|
393 return;
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|
|
394
|
|
|
395 // handle non-immediate
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|
|
396 insn_resolve_gen_aux(as, l, force);
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|
|
397 }
|
|
|
398
|
|
|
399 EMITFUNC(insn_emit_gen32)
|
|
339
|
400 {
|
|
361
|
401 if (l -> lint2 == 3)
|
|
|
402 {
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|
|
403 lw_expr_t e;
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|
404 e = lwasm_fetch_expr(l, 0);
|
|
|
405 lwasm_emitop(l, instab[l -> insn].ops[3]);
|
|
|
406 lwasm_emitexpr(l, e, 4);
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|
|
407 return;
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|
|
408 }
|
|
|
409
|
|
362
|
410 insn_emit_gen_aux(as, l, -1);
|
|
361
|
411 }
|
|
|
412
|
|
|
413 PARSEFUNC(insn_parse_imm8)
|
|
|
414 {
|
|
|
415 lw_expr_t e;
|
|
339
|
416
|
|
|
417 if (**p == '#')
|
|
|
418 {
|
|
|
419 (*p)++;
|
|
|
420
|
|
361
|
421 e = lwasm_parse_expr(as, p);
|
|
|
422 if (!e)
|
|
|
423 {
|
|
|
424 lwasm_register_error(as, l, "Bad operand");
|
|
|
425 return;
|
|
|
426 }
|
|
|
427 l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
|
|
|
428 lwasm_save_expr(l, 0, e);
|
|
|
429 }
|
|
|
430 }
|
|
339
|
431
|
|
361
|
432 EMITFUNC(insn_emit_imm8)
|
|
|
433 {
|
|
|
434 lw_expr_t e;
|
|
|
435
|
|
|
436 lwasm_emitop(l, instab[l -> insn].ops[0]);
|
|
|
437 lwasm_emitexpr(l, e, 1);
|
|
339
|
438 }
|
