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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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382
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33 extern void insn_indexed_resolve_aux(asmstate_t *as, line_t *l, int force, int elen);
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361
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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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382
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127 void insn_resolve_gen_aux(asmstate_t *as, line_t *l, int force, int elen)
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361
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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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382
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134 insn_resolve_indexed_aux(as, l, force, elen);
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361
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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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382
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190 if (l -> lint2 == 1)
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361
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191 {
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192 lwasm_emit(l, l -> pb);
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382
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193 if (l -> lint > 0)
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194 lwasm_emitexpr(l, e, l -> lint);
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361
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195 return;
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196 }
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197
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198 if (l -> lint2 == 2)
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199 lwasm_emitexpr(l, e, 2);
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200 else
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201 lwasm_emitexpr(l, e, 1);
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339
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202 }
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203
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204 // the various insn_gen? functions have an immediate mode of ? bits
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361
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205 PARSEFUNC(insn_parse_gen0)
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339
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206 {
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207 if (**p == '#')
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208 {
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361
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209 lwasm_register_error(as, l, "Immediate mode not allowed");
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339
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210 return;
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211 }
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212
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213 // handle non-immediate
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361
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214 insn_parse_gen_aux(as, l, p);
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339
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215 }
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216
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361
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217 RESOLVEFUNC(insn_resolve_gen0)
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339
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218 {
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361
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219 if (l -> len != -1)
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220 return;
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221
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222 // handle non-immediate
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382
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223 insn_resolve_gen_aux(as, l, force, 0);
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361
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224 }
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225
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226 EMITFUNC(insn_emit_gen0)
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227 {
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362
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228 insn_emit_gen_aux(as, l, -1);
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361
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229 }
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230
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231 PARSEFUNC(insn_parse_gen8)
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232 {
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339
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233 if (**p == '#')
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234 {
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361
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235 lw_expr_t e;
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236
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339
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237 (*p)++;
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361
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238 e = lwasm_parse_expr(as, p);
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239 if (!e)
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339
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240 {
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361
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241 lwasm_register_error(as, l, "Bad operand");
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242 return;
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339
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243 }
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361
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244 l -> len = OPLEN(instab[l -> insn].ops[3]) + 1;
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245 l -> lint2 = 3;
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246 lwasm_save_expr(l, 0, e);
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339
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247 return;
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248 }
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249
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361
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250 // handle non-immediate
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251 insn_parse_gen_aux(as, l, p);
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252 if (l -> lint2 != -1)
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253 {
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254 if (l -> lint2 == 0)
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255 {
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256 l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
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257 }
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258 else if (l -> lint2 == 2)
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259 {
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260 l -> len = OPLEN(instab[l -> insn].ops[2]) + 2;
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261 }
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262 else if (l -> lint2 == 1 && l -> lint != -1)
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263 {
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264 l -> len = OPLEN(instab[l -> insn].ops[1]) + l -> lint + 1;
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265 }
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266 }
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339
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267 }
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268
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361
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269 RESOLVEFUNC(insn_resolve_gen8)
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270 {
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271 if (l -> len != -1)
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272 return;
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273
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274 // handle non-immediate
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382
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275 insn_resolve_gen_aux(as, l, force, 0);
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361
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276 }
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277
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278 EMITFUNC(insn_emit_gen8)
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339
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279 {
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361
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280 if (l -> lint2 == 3)
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281 {
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282 lw_expr_t e;
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283 e = lwasm_fetch_expr(l, 0);
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284 lwasm_emitop(l, instab[l -> insn].ops[3]);
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285 lwasm_emitexpr(l, e, 1);
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286 return;
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287 }
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288
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362
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289 insn_emit_gen_aux(as, l, -1);
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361
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290 }
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291
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292 PARSEFUNC(insn_parse_gen16)
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293 {
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339
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294 if (**p == '#')
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295 {
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361
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296 lw_expr_t e;
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297
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339
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298 (*p)++;
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361
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299 e = lwasm_parse_expr(as, p);
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300 if (!e)
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339
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301 {
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361
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302 lwasm_register_error(as, l, "Bad operand");
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303 return;
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339
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304 }
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361
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305 l -> len = OPLEN(instab[l -> insn].ops[3]) + 2;
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306 l -> lint2 = 3;
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307 lwasm_save_expr(l, 0, e);
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339
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308 return;
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309 }
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310
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361
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311 // handle non-immediate
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312 insn_parse_gen_aux(as, l, p);
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313 if (l -> lint2 != -1)
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314 {
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315 if (l -> lint2 == 0)
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316 {
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317 l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
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318 }
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319 else if (l -> lint2 == 2)
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320 {
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321 l -> len = OPLEN(instab[l -> insn].ops[2]) + 2;
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322 }
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323 else if (l -> lint2 == 1 && l -> lint != -1)
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324 {
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325 l -> len = OPLEN(instab[l -> insn].ops[1]) + l -> lint + 1;
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326 }
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327 }
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339
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328 }
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329
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361
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330 RESOLVEFUNC(insn_resolve_gen16)
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331 {
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332 if (l -> len != -1)
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333 return;
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334
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335 // handle non-immediate
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382
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336 insn_resolve_gen_aux(as, l, force, 0);
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361
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337 }
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338
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339 EMITFUNC(insn_emit_gen16)
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339
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340 {
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361
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341 if (l -> lint2 == 3)
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342 {
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343 lw_expr_t e;
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344 e = lwasm_fetch_expr(l, 0);
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345 lwasm_emitop(l, instab[l -> insn].ops[3]);
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346 lwasm_emitexpr(l, e, 2);
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347 return;
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348 }
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349
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362
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350 insn_emit_gen_aux(as, l, -1);
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361
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351 }
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352
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353 PARSEFUNC(insn_parse_gen32)
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354 {
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339
|
355 if (**p == '#')
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356 {
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361
|
357 lw_expr_t e;
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358
|
|
339
|
359 (*p)++;
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361
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360 e = lwasm_parse_expr(as, p);
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|
|
361 if (!e)
|
|
339
|
362 {
|
|
361
|
363 lwasm_register_error(as, l, "Bad operand");
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|
364 return;
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|
339
|
365 }
|
|
361
|
366 l -> len = OPLEN(instab[l -> insn].ops[3]) + 4;
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|
367 l -> lint2 = 3;
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|
|
368 lwasm_save_expr(l, 0, e);
|
|
339
|
369 return;
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|
|
370 }
|
|
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371
|
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361
|
372 // handle non-immediate
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|
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373 insn_parse_gen_aux(as, l, p);
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374 if (l -> lint2 != -1)
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|
|
375 {
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|
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376 if (l -> lint2 == 0)
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|
|
377 {
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|
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378 l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
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|
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379 }
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380 else if (l -> lint2 == 2)
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|
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381 {
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382 l -> len = OPLEN(instab[l -> insn].ops[2]) + 2;
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383 }
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384 else if (l -> lint2 == 1 && l -> lint != -1)
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|
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385 {
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386 l -> len = OPLEN(instab[l -> insn].ops[1]) + l -> lint + 1;
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|
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387 }
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|
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388 }
|
|
339
|
389 }
|
|
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390
|
|
361
|
391 RESOLVEFUNC(insn_resolve_gen32)
|
|
|
392 {
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|
|
393 if (l -> len != -1)
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|
|
394 return;
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|
|
395
|
|
|
396 // handle non-immediate
|
|
382
|
397 insn_resolve_gen_aux(as, l, force, 0);
|
|
361
|
398 }
|
|
|
399
|
|
|
400 EMITFUNC(insn_emit_gen32)
|
|
339
|
401 {
|
|
361
|
402 if (l -> lint2 == 3)
|
|
|
403 {
|
|
|
404 lw_expr_t e;
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|
|
405 e = lwasm_fetch_expr(l, 0);
|
|
|
406 lwasm_emitop(l, instab[l -> insn].ops[3]);
|
|
|
407 lwasm_emitexpr(l, e, 4);
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|
|
408 return;
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|
|
409 }
|
|
|
410
|
|
362
|
411 insn_emit_gen_aux(as, l, -1);
|
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361
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412 }
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413
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414 PARSEFUNC(insn_parse_imm8)
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415 {
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416 lw_expr_t e;
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339
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417
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418 if (**p == '#')
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419 {
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420 (*p)++;
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421
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361
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422 e = lwasm_parse_expr(as, p);
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423 if (!e)
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424 {
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425 lwasm_register_error(as, l, "Bad operand");
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426 return;
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427 }
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428 l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
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429 lwasm_save_expr(l, 0, e);
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430 }
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431 }
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339
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432
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361
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433 EMITFUNC(insn_emit_imm8)
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434 {
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435 lw_expr_t e;
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436
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437 lwasm_emitop(l, instab[l -> insn].ops[0]);
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438 lwasm_emitexpr(l, e, 1);
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339
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439 }
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