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annotate lwasm/insn_tfm.c @ 333:507f442dc71e

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Add support for 6800 compatibility instructions. The occasional program uses the 6800 compatibility instructions since they are actually specified by Motorola in at least some documentation. They advertised the 6809 as source compatible with the 6800. This mode is not enabled by default, however. It is my belief that receiving an error when using a non-6809 instruction is more useful since it is unlikely that much 6800 source code is being assembled for the 6809 these days. Nevertheless, the --6809compat option is present for just those purposes so one does not have to resort to using macros (which would work equally well in most cases).
author William Astle <lost@l-w.ca>
date Tue, 15 Apr 2014 10:57:34 -0600
parents 09021ba6d755
children 8764142b3192
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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, "Unknown operation");
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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 if (*(*p)++ != ',')
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52 {
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53 lwasm_register_error(as, l, "Unknown operation");
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54 return;
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55 }
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56 c = strchr(reglist, toupper(*(*p)++));
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57 if (!c)
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58 {
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59 lwasm_register_error(as, l, "Unknown operation");
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60 return;
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61 }
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62 r1 = c - reglist;
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63
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64 if (**p == '+')
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65 {
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66 (*p)++;
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67 tfm |= 4;
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68 }
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69 else if (**p == '-')
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70 {
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71 (*p)++;
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72 tfm |= 8;
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73 }
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74
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75 if (**p && !isspace(**p))
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76 {
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77 lwasm_register_error(as, l, "Bad operand");
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78 return;
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79 }
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80
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81 // valid values of tfm here are:
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82 // 1: r0+,r1 (2)
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83 // 4: r0,r1+ (3)
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84 // 5: r0+,r1+ (0)
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85 // 10: r0-,r1- (1)
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86 switch (tfm)
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87 {
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88 case 5: //r0+,r1+
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89 l -> lint = instab[l -> insn].ops[0];
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90 break;
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91
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92 case 10: //r0-,r1-
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93 l -> lint = instab[l -> insn].ops[1];
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94 break;
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95
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96 case 1: // r0+,r1
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97 l -> lint = instab[l -> insn].ops[2];
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98 break;
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99
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100 case 4: // r0,r1+
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101 l -> lint = instab[l -> insn].ops[3];
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102 break;
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103
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104 default:
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105 lwasm_register_error(as, l, "Unknown operation");
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106 return;
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107 }
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108 l -> pb = (r0 << 4) | r1;
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109 l -> len = OPLEN(l -> lint) + 1;
0
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110 }
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111
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112 EMITFUNC(insn_emit_tfm)
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113 {
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114 lwasm_emitop(l, l -> lint);
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115 lwasm_emit(l, l -> pb);
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116 }
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117
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118 PARSEFUNC(insn_parse_tfmrtor)
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119 {
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120 int r0, r1;
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121 static const char *regs = "D X Y U S A B 0 0 E F ";
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122
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123 // register to register (r0,r1)
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124 // registers are in order:
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125 // D,X,Y,U,S,PC,W,V
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126 // A,B,CC,DP,0,0,E,F
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127 r0 = lwasm_lookupreg2(regs, p);
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128 if (r0 < 0 || *(*p)++ != ',')
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129 {
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130 lwasm_register_error(as, l, "Bad operand");
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131 r0 = r1 = 0;
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132 }
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133 else
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134 {
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135 r1 = lwasm_lookupreg2(regs, p);
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136 if (r1 < 0)
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137 {
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138 lwasm_register_error(as, l, "Bad operand");
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139 r0 = r1 = 0;
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140 }
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141 }
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142 l -> len = instab[l -> insn].ops[0] + 1;
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143 l -> pb = (r0 << 4) | r1;
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144 }
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145
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146 EMITFUNC(insn_emit_tfmrtor)
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147 {
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148 lwasm_emitop(l, instab[l -> insn].ops[0]);
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149 lwasm_emit(l, l -> pb);
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150 }