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339
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1 /*
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2 insn_indexed.c
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3 Copyright © 2009 William Astle
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4
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5 This file is part of LWASM.
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6
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7 LWASM is free software: you can redistribute it and/or modify it under the
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation, either version 3 of the License, or (at your option) any later
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10 version.
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11
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12 This program is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 more details.
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16
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17 You should have received a copy of the GNU General Public License along with
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18 this program. If not, see <http://www.gnu.org/licenses/>.
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19 */
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20
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21 /*
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22 for handling indexed mode instructions
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23 */
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24
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25 #include <config.h>
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26
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27 #include <ctype.h>
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28 #include <string.h>
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29
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359
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30 #include <lw_expr.h>
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31
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339
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32 #include "lwasm.h"
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33 #include "instab.h"
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34
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359
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35 /*
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36 l -> lint: size of operand (0, 1, 2, -1 if not determined)
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37 l -> pb: actual post byte (from "resolve" stage) or info passed
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38 forward to the resolve stage (if l -> line is -1); 0x80 is indir
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39 bits 0-2 are register number
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40 */
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41 void insn_parse_indexed_aux(asmstate_t *as, line_t *l, char **p)
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339
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42 {
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43 struct opvals { char *opstr; int pb; };
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44
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45 static const char *regs = "X Y U S W PCRPC ";
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46 static const struct opvals simpleindex[] =
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47 {
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48 {",x", 0x84}, {",y", 0xa4}, {",u", 0xc4}, {",s", 0xe4},
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49 {",x+", 0x80}, {",y+", 0xa0}, {",u+", 0xc0}, {",s+", 0xe0},
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50 {",x++", 0x81}, {",y++", 0xa1}, {",u++", 0xc1}, {",s++", 0xe1},
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51 {",-x", 0x82}, {",-y", 0xa2}, {",-u", 0xc2}, {",-s", 0xe2},
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52 {",--x", 0x83}, {",--y", 0xa3}, {",--u", 0xc3}, {",--s", 0xe3},
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53 {"a,x", 0x86}, {"a,y", 0xa6}, {"a,u", 0xc6}, {"a,s", 0xe6},
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54 {"b,x", 0x85}, {"b,y", 0xa5}, {"b,u", 0xc5}, {"b,s", 0xe5},
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55 {"e,x", 0x87}, {"e,y", 0xa7}, {"e,u", 0xc7}, {"e,s", 0xe7},
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56 {"f,x", 0x8a}, {"f,y", 0xaa}, {"f,u", 0xca}, {"f,s", 0xea},
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57 {"d,x", 0x8b}, {"d,y", 0xab}, {"d,u", 0xcb}, {"d,s", 0xed},
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58 {"w,x", 0x8e}, {"w,y", 0xae}, {"w,u", 0xce}, {"w,s", 0xee},
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59 {",w", 0x8f}, {",w++", 0xcf}, {",--w", 0xef},
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60
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61 {"[,x]", 0x94}, {"[,y]", 0xb4}, {"[,u", 0xd4}, {"[,s]", 0xf4},
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62 {"[,x++]", 0x91}, {"[,y++]", 0xb1}, {"[,u++]", 0xd1}, {"[,s++]", 0xf1},
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63 {"[,--x]", 0x93}, {"[,--y]", 0xb3}, {"[,--u]", 0xd3}, {"[,--s]", 0xf3},
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64 {"[a,x]", 0x96}, {"[a,y]", 0xb6}, {"[a,u]", 0xd6}, {"[a,s]", 0xf6},
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65 {"[b,x]", 0x95}, {"[b,y]", 0xb5}, {"[b,u]", 0xd5}, {"[b,s]", 0xf5},
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66 {"[e,x]", 0x97}, {"[e,y]", 0xb7}, {"[e,u]", 0xd7}, {"[e,s]", 0xf7},
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67 {"[f,x]", 0x9a}, {"[f,y]", 0xba}, {"[f,u]", 0xda}, {"[f,s]", 0xfa},
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68 {"[d,x]", 0x9b}, {"[d,y]", 0xbb}, {"[d,u]", 0xdb}, {"[d,s]", 0xfd},
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69 {"[w,x]", 0x9e}, {"[w,y]", 0xbe}, {"[w,u]", 0xde}, {"[w,s]", 0xfe},
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70 {"[,w]", 0x90}, {"[,w++]", 0xd0}, {"[,--w]", 0xf0},
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71
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72 { "", -1 }
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73 };
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74
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75 static const char *regs9 = "X Y U S PCRPC ";
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76 static const struct opvals simpleindex9[] =
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77 {
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78 {",x", 0x84}, {",y", 0xa4}, {",u", 0xc4}, {",s", 0xe4},
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79 {",x+", 0x80}, {",y+", 0xa0}, {",u+", 0xc0}, {",s+", 0xe0},
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80 {",x++", 0x81}, {",y++", 0xa1}, {",u++", 0xc1}, {",s++", 0xe1},
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81 {",-x", 0x82}, {",-y", 0xa2}, {",-u", 0xc2}, {",-s", 0xe2},
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82 {",--x", 0x83}, {",--y", 0xa3}, {",--u", 0xc3}, {",--s", 0xe3},
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83 {"a,x", 0x86}, {"a,y", 0xa6}, {"a,u", 0xc6}, {"a,s", 0xe6},
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84 {"b,x", 0x85}, {"b,y", 0xa5}, {"b,u", 0xc5}, {"b,s", 0xe5},
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85 {"d,x", 0x8b}, {"d,y", 0xab}, {"d,u", 0xcb}, {"d,s", 0xed},
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86
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87 {"[,x]", 0x94}, {"[,y]", 0xb4}, {"[,u", 0xd4}, {"[,s]", 0xf4},
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88 {"[,x++]", 0x91}, {"[,y++]", 0xb1}, {"[,u++]", 0xd1}, {"[,s++]", 0xf1},
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89 {"[,--x]", 0x93}, {"[,--y]", 0xb3}, {"[,--u]", 0xd3}, {"[,--s]", 0xf3},
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90 {"[a,x]", 0x96}, {"[a,y]", 0xb6}, {"[a,u]", 0xd6}, {"[a,s]", 0xf6},
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91 {"[b,x]", 0x95}, {"[b,y]", 0xb5}, {"[b,u]", 0xd5}, {"[b,s]", 0xf5},
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92 {"[d,x]", 0x9b}, {"[d,y]", 0xbb}, {"[d,u]", 0xdb}, {"[d,s]", 0xfd},
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93
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94 { "", -1 }
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95 };
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96 char stbuf[25];
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97 int i, j, rn;
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98 int indir = 0;
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359
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99 int f0 = 1;
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339
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100 const struct opvals *simples;
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101 const char *reglist;
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359
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102 lw_expr_t e;
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103
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104 if (as -> target == TARGET_6809)
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339
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105 {
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106 simples = simpleindex9;
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107 reglist = regs9;
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108 }
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109 else
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110 {
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111 simples = simpleindex;
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112 reglist = regs;
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113 }
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114
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115 // fetch out operand for lookup
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116 for (i = 0; i < 24; i++)
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117 {
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118 if (*((*p) + i) && !isspace(*((*p) + i)))
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119 stbuf[i] = *((*p) + i);
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120 else
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121 break;
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122 }
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123 stbuf[i] = '\0';
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124
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125 // now look up operand in "simple" table
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126 if (!*((*p) + i) || isspace(*((*p) + i)))
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127 {
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128 // do simple lookup
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129 for (j = 0; simples[j].opstr[0]; j++)
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130 {
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131 if (!strcasecmp(stbuf, simples[j].opstr))
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132 break;
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133 }
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134 if (simples[j].opstr[0])
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135 {
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359
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136 l -> pb = simples[j].pb;
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137 l -> lint = 0;
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339
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138 (*p) += i;
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139 return;
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140 }
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141 }
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142
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143 // now do the "hard" ones
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144
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145 // is it indirect?
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146 if (**p == '[')
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147 {
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148 indir = 1;
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149 (*p)++;
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150 }
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151
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152 // look for a "," - all indexed modes have a "," except extended indir
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153 rn = 0;
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154 for (i = 0; (*p)[i] && !isspace((*p)[i]); i++)
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155 {
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156 if ((*p)[i] == ',')
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157 {
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158 rn = 1;
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159 break;
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160 }
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161 }
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162
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163 // if no "," and indirect, do extended indir
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164 if (!rn && indir)
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165 {
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166 // extended indir
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359
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167 l -> pb = 0x9f;
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168 e = lwasm_parse_expr(as, p);
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169 if (!e || **p != ']')
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339
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170 {
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359
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171 lwasm_register_error(as, l, "Bad operand");
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339
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172 return;
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173 }
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174
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175 (*p)++;
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359
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176 l -> lint = 2;
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339
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177 return;
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178 }
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179
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180 if (**p == '<')
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181 {
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359
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182 l -> lint = 1;
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339
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183 (*p)++;
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184 }
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185 else if (**p == '>')
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186 {
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359
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187 l -> lint = 2;
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339
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188 (*p)++;
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189 }
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190
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191 if (**p == '0' && *(*p+1) == ',')
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192 {
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193 f0 = 1;
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194 }
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195
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196 // now we have to evaluate the expression
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359
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197 e = lwasm_parse_expr(as, p);
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198 if (!e)
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339
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199 {
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359
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200 lwasm_register_error(as, l, "Bad operand");
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339
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201 return;
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202 }
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359
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203 lwasm_save_expr(l, 0, e);
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204
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339
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205 // now look for a comma; if not present, explode
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206 if (*(*p)++ != ',')
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207 {
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359
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208 lwasm_register_error(as, l, "Bad operand");
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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 // now get the register
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213 rn = lwasm_lookupreg3(reglist, p);
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214 if (rn < 0)
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215 {
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359
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216 lwasm_register_error(as, l, "Bad register");
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339
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217 return;
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218 }
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219
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220 if (indir)
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221 {
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222 if (**p != ']')
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223 {
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359
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224 lwasm_register_error(as, l, "Bad operand");
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339
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225 return;
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226 }
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227 else
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228 (*p)++;
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229 }
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230
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231 // nnnn,W is only 16 bit (or 0 bit)
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232 if (rn == 4)
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233 {
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359
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234 if (l -> lint == 1)
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339
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235 {
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359
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236 lwasm_register_error(as, l, "n,W cannot be 8 bit");
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339
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237 return;
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238 }
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359
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239
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240 if (l -> lint == 2)
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339
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241 {
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359
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242 l -> pb = indir ? 0xb0 : 0xcf;
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243 l -> lint = 2;
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244 return;
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245 }
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246
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247 l -> pb = (0x80 * indir) | rn;
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248
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249 /* [,w] and ,w
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339
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250 if (indir)
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251 *b1 = 0x90;
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252 else
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253 *b1 = 0x8f;
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359
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254 */
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339
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255 return;
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256 }
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257
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258 // PCR? then we have PC relative addressing (like B??, LB??)
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259 if (rn == 5)
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260 {
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359
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261 lw_expr_t e1, e2;
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339
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262 // external references are handled exactly the same as for
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263 // relative addressing modes
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264 // on pass 1, adjust the expression for a subtraction of the
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265 // current address
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266
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359
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267 e1 = lw_expr_build(lw_expr_type_special, lwasm_expr_linelen, l);
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268 e2 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_plus, l -> addr, e1);
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269 lw_expr_destroy(e1);
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270 e1 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_minus, e, l -> addr);
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271 lwasm_save_expr(l, 0, e1);
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272 lw_expr_destroy(e2);
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339
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273 }
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274
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359
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275 l -> pb = (indir * 0x80) | rn | (f0 * 0x40);
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276 }
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339
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277
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359
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278 PARSEFUNC(insn_parse_indexed)
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279 {
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280 l -> lint = -1;
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281 insn_parse_indexed_aux(as, l, p);
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282
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283 if (l -> lint != -1)
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339
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284 {
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359
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285 l -> len = OPLEN(instab[l -> insn].ops[0]) + l -> lint + 1;
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339
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286 }
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359
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287 }
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339
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288
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359
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289 void insn_resolve_indexed_aux(asmstate_t *as, line_t *l)
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290 {
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339
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291 }
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292
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359
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293 RESOLVEFUNC(insn_resolve_indexed)
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339
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294 {
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359
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295 insn_resolve_indexed_aux(as, l);
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339
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296
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359
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297 if (l -> lint != -1 && l -> pb != -1)
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298 {
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299 l -> len = OPLEN(instab[l -> insn].ops[0]) + l -> lint + 1;
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300 }
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301 }
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339
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302
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359
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303 void insn_emit_indexed_aux(asmstate_t *as, line_t *l)
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304 {
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305 lw_expr_t e;
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306
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307 lwasm_emitop(l, instab[l -> insn].ops[0]);
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308 lwasm_emitop(l, l -> pb);
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309 if (l -> lint > 0)
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310 {
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311 e = lwasm_fetch_expr(l, 0);
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312 lwasm_emitexpr(l, e, l -> lint);
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313 }
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339
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314 }
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359
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315
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316 EMITFUNC(insn_emit_indexed)
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317 {
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318 insn_emit_indexed_aux(as, l);
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319 }
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