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339
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1 /*
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2 insn_tfm.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 #include <config.h>
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22 #include <ctype.h>
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23 #include <string.h>
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24
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25 #include "lwasm.h"
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26 #include "instab.h"
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27
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357
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28 PARSEFUNC(insn_parse_tfm)
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339
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29 {
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30 static const char *reglist = "DXYUS AB 00EF";
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31 int r0, r1;
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32 char *c;
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33 int tfm = 0;
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34
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35 c = strchr(reglist, toupper(*(*p)++));
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36 if (!c)
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37 {
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357
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38 lwasm_register_error(as, l, "Unknown operation");
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339
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39 return;
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40 }
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41 r0 = c - reglist;
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42 if (**p == '+')
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43 {
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44 (*p)++;
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45 tfm = 1;
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46 }
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47 else if (**p == '-')
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48 {
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49 (*p)++;
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50 tfm = 2;
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51 }
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52 if (*(*p)++ != ',')
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53 {
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357
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54 lwasm_register_error(as, l, "Unknown operation");
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339
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55 return;
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56 }
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57 c = strchr(reglist, toupper(*(*p)++));
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58 if (!c)
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59 {
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357
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60 lwasm_register_error(as, l, "Unknown operation");
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339
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61 return;
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62 }
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63 r1 = c - reglist;
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64
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65 if (**p == '+')
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66 {
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67 (*p)++;
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68 tfm |= 4;
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69 }
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70 else if (**p == '-')
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71 {
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72 (*p)++;
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73 tfm |= 8;
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74 }
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75
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76 if (**p && !isspace(**p))
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77 {
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357
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78 lwasm_register_error(as, l, "Bad operand");
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339
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79 return;
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80 }
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81
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82 // valid values of tfm here are:
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83 // 1: r0+,r1 (2)
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84 // 4: r0,r1+ (3)
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85 // 5: r0+,r1+ (0)
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86 // 10: r0-,r1- (1)
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87 switch (tfm)
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88 {
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89 case 5: //r0+,r1+
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357
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90 l -> lint = instab[l -> insn].ops[0];
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339
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91 break;
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357
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92
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339
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93 case 10: //r0-,r1-
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357
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94 l -> lint = instab[l -> insn].ops[1];
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339
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95 break;
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357
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96
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339
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97 case 1: // r0+,r1
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357
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98 l -> lint = instab[l -> insn].ops[2];
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339
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99 break;
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357
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100
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339
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101 case 4: // r0,r1+
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357
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102 l -> lint = instab[l -> insn].ops[3];
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103 break;
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357
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104
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339
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105 default:
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357
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106 lwasm_register_error(as, l, "Unknown operation");
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339
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107 return;
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108 }
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357
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109 l -> pb = (r0 << 4) | r1;
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110 l -> len = OPLEN(l -> lint);
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339
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111 }
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112
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357
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113 EMITFUNC(insn_emit_tfm)
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114 {
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115 lwasm_emitop(l, l -> lint);
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116 lwasm_emit(l, l -> pb);
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117 }
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118
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119 PARSEFUNC(insn_parse_tfmrtor)
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339
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120 {
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121 int r0, r1;
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122 static const char *regs = "D X Y U S A B 0 0 E F ";
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123
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124 // register to register (r0,r1)
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125 // registers are in order:
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126 // D,X,Y,U,S,PC,W,V
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127 // A,B,CC,DP,0,0,E,F
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128 r0 = lwasm_lookupreg2(regs, p);
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129 if (r0 < 0 || *(*p)++ != ',')
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130 {
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357
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131 lwasm_register_error(as, l, "Bad operand");
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339
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132 r0 = r1 = 0;
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133 }
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134 else
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135 {
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136 r1 = lwasm_lookupreg2(regs, p);
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137 if (r1 < 0)
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138 {
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357
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139 lwasm_register_error(as, l, "Bad operand");
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339
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140 r0 = r1 = 0;
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141 }
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142 }
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357
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143 l -> len = instab[l -> insn].ops[0] + 1;
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144 l -> pb = (r0 << 4) | r1;
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339
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145 }
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357
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146
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147 EMITFUNC(insn_emit_tfmrtor)
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148 {
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149 lwasm_emitop(l, instab[l -> insn].ops[0]);
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150 lwasm_emit(l, l -> pb);
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151 }
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