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annotate lwasm/insn_tfm.c @ 577:e49d24f4a9a5

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Correct bug in the object file output code leading to stack corruption It turns out leaving a pointer to a stack allocated temporary in a persistent data structure is not conducive to correct program operation. Undo the export check setup in the object file output sequence so a pointer to stack allocated memory is not left hanging when the function returns. This seems to correct at least one mysterious crash bug, and possibly others. Thanks to Boisy Pitre for reporting the crash bug that led to this discovery, as well as a previous crash bug that likely has the same root cause. Additional thanks to Ciaran Anscomb whose debugger wielding wizardry revealed the exact location of this particular bit of unbrilliance.
author William Astle <lost@l-w.ca>
date Sat, 03 Aug 2024 14:30:06 -0600
parents 01bdad2118aa
children
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_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);
402
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136 lwasm_skip_to_next_token(l, p);
0
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137 if (r0 < 0 || *(*p)++ != ',')
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138 {
370
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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 {
402
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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 }