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annotate lwasm/insn_tfm.c @ 558:7fb2047ccdee

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author William Astle <lost@l-w.ca>
date Fri, 08 Sep 2023 00:35:43 -0600
parents 01bdad2118aa
children
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0
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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 <ctype.h>
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22 #include <string.h>
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23
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24 #include "lwasm.h"
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25 #include "instab.h"
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26
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27 PARSEFUNC(insn_parse_tfm)
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28 {
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29 static const char *reglist = "DXYUS AB 00EF";
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30 int r0, r1;
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31 char *c;
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32 int tfm = 0;
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33
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34 c = strchr(reglist, toupper(*(*p)++));
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35 if (!c)
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36 {
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37 lwasm_register_error(as, l, E_REGISTER_BAD);
0
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38 return;
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39 }
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40 r0 = c - reglist;
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41 if (**p == '+')
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42 {
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43 (*p)++;
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44 tfm = 1;
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45 }
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46 else if (**p == '-')
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47 {
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48 (*p)++;
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49 tfm = 2;
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50 }
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51 lwasm_skip_to_next_token(l, p);
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52 if (*(*p)++ != ',')
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53 {
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54 lwasm_register_error(as, l, E_UNKNOWN_OPERATION);
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55 return;
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56 }
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57 lwasm_skip_to_next_token(l, p);
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58 c = strchr(reglist, toupper(*(*p)++));
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59 if (!c)
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60 {
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61 lwasm_register_error(as, l, E_REGISTER_BAD);
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62 return;
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63 }
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64 r1 = c - reglist;
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65
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66 if (**p == '+')
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67 {
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68 (*p)++;
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69 tfm |= 4;
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70 }
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71 else if (**p == '-')
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72 {
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73 (*p)++;
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74 tfm |= 8;
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75 }
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76
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77 if (**p && !isspace(**p))
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78 {
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79 lwasm_register_error(as, l, E_OPERAND_BAD);
0
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80 return;
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81 }
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82 /* only D, X, Y, U, S are valid tfm registers */
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83 if (r0 > 4 || r1 > 4)
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84 {
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85 if (r0 < r1) r0 = r1;
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86 lwasm_register_error2(as, l, E_REGISTER_BAD, "'%c'", reglist[r0]);
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87 }
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88
0
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89 // valid values of tfm here are:
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90 // 1: r0+,r1 (2)
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91 // 4: r0,r1+ (3)
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92 // 5: r0+,r1+ (0)
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93 // 10: r0-,r1- (1)
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94 switch (tfm)
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95 {
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96 case 5: //r0+,r1+
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97 l -> lint = instab[l -> insn].ops[0];
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98 break;
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99
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100 case 10: //r0-,r1-
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101 l -> lint = instab[l -> insn].ops[1];
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102 break;
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103
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104 case 1: // r0+,r1
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105 l -> lint = instab[l -> insn].ops[2];
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106 break;
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107
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108 case 4: // r0,r1+
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109 l -> lint = instab[l -> insn].ops[3];
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110 break;
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111
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112 default:
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113 lwasm_register_error(as, l, E_UNKNOWN_OPERATION);
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114 return;
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115 }
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116 l -> pb = (r0 << 4) | r1;
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09021ba6d755 Fixed length bug in tfm
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117 l -> len = OPLEN(l -> lint) + 1;
0
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118 }
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119
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120 EMITFUNC(insn_emit_tfm)
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121 {
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122 lwasm_emitop(l, l -> lint);
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123 lwasm_emit(l, l -> pb);
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124 }
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125
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126 PARSEFUNC(insn_parse_tfmrtor)
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127 {
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128 int r0, r1;
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129 static const char *regs = "D X Y U S A B 0 0 E F ";
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130
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131 // register to register (r0,r1)
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132 // registers are in order:
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133 // D,X,Y,U,S,PC,W,V
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134 // A,B,CC,DP,0,0,E,F
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135 r0 = lwasm_lookupreg2(regs, p);
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136 lwasm_skip_to_next_token(l, p);
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137 if (r0 < 0 || *(*p)++ != ',')
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138 {
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139 lwasm_register_error(as, l, E_OPERAND_BAD);
0
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140 r0 = r1 = 0;
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141 }
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142 else
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143 {
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144 lwasm_skip_to_next_token(l, p);
0
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145 r1 = lwasm_lookupreg2(regs, p);
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146 if (r1 < 0)
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147 {
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148 lwasm_register_error(as, l, E_OPERAND_BAD);
0
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149 r0 = r1 = 0;
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150 }
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151 }
522
01bdad2118aa Fix instruction length calculation for TFM compatibility operations
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152 l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
0
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153 l -> pb = (r0 << 4) | r1;
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154 }
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155
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156 EMITFUNC(insn_emit_tfmrtor)
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157 {
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158 lwasm_emitop(l, instab[l -> insn].ops[0]);
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159 lwasm_emit(l, l -> pb);
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160 }