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annotate lwasm/insn_tfm.c @ 273:1409debcb1a0

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Fix crash on listing when nested noexpand macros are used Macros flagged noexpand were causing a segfault during listing. The problem was incorrect accounting for nesting levels for noexpand macros causing the listing handler to fall off the end of the program in certain circumstances and in other circumstances it would fail to suppress expansion. Both the segfault in the case of misbehaviour and the misbhaviour itself are corrected with this update. If you do not use nested noexpand macros, this bug has no effect.
author William Astle <lost@l-w.ca>
date Sat, 25 May 2013 13:35:46 -0600
parents 09021ba6d755
children 8764142b3192
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, "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;
134
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, "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 }