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annotate lwasm/insn_tfm.c @ 374:8e25147c2aa8

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Clean up various "externs" Apparently some compilers seriously choke on the "extern" keyword in some circumstances where GCC does not. Remove most instances of "extern" to guard against that. Thanks to Erik G <erik@6809.org> for the patch.
author William Astle <lost@l-w.ca>
date Mon, 13 Jul 2015 20:31:56 -0600
parents 8764142b3192
children 2abcd82b455f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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_UNKNOWN_OPERATION);
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 if (*(*p)++ != ',')
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52 {
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53 lwasm_register_error(as, l, E_UNKNOWN_OPERATION);
0
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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, E_UNKNOWN_OPERATION);
0
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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, E_OPERAND_BAD);
0
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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, E_UNKNOWN_OPERATION);
0
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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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09021ba6d755 Fixed length bug in tfm
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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, E_OPERAND_BAD);
0
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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 {
370
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138 lwasm_register_error(as, l, E_OPERAND_BAD);
0
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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 }