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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
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children
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1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
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2 <HTML
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3 ><HEAD
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4 ><TITLE
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5 >Output Formats</TITLE
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6 ><META
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7 NAME="GENERATOR"
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8 CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
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9 REL="HOME"
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10 TITLE="LW Tool Chain"
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11 HREF="index.html"><LINK
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12 REL="PREVIOUS"
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13 TITLE="Introduction"
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14 HREF="c13.html"><LINK
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15 REL="NEXT"
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16 TITLE="DECB Binaries"
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17 HREF="x27.html"></HEAD
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18 ><BODY
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19 CLASS="CHAPTER"
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20 BGCOLOR="#FFFFFF"
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21 TEXT="#000000"
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22 LINK="#0000FF"
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23 VLINK="#840084"
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24 ALINK="#0000FF"
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25 ><DIV
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26 CLASS="NAVHEADER"
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27 ><TABLE
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28 SUMMARY="Header navigation table"
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29 WIDTH="100%"
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30 BORDER="0"
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31 CELLPADDING="0"
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32 CELLSPACING="0"
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33 ><TR
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34 ><TH
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35 COLSPAN="3"
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36 ALIGN="center"
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37 >LW Tool Chain</TH
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38 ></TR
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39 ><TR
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40 ><TD
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41 WIDTH="10%"
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42 ALIGN="left"
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43 VALIGN="bottom"
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44 ><A
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45 HREF="c13.html"
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46 ACCESSKEY="P"
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47 >Prev</A
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48 ></TD
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49 ><TD
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50 WIDTH="80%"
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51 ALIGN="center"
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52 VALIGN="bottom"
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53 ></TD
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54 ><TD
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55 WIDTH="10%"
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56 ALIGN="right"
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57 VALIGN="bottom"
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58 ><A
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59 HREF="x27.html"
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60 ACCESSKEY="N"
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61 >Next</A
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62 ></TD
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63 ></TR
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64 ></TABLE
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65 ><HR
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66 ALIGN="LEFT"
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67 WIDTH="100%"></DIV
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68 ><DIV
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69 CLASS="CHAPTER"
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70 ><H1
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71 ><A
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72 NAME="AEN21"
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73 ></A
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74 >Chapter 2. Output Formats</H1
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75 ><P
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76 >The LW tool chain supports multiple output formats. Each format has its
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77 advantages and disadvantages. Each format is described below.</P
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78 ><DIV
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79 CLASS="SECTION"
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80 ><H1
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81 CLASS="SECTION"
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82 ><A
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83 NAME="AEN24"
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84 >2.1. Raw Binaries</A
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85 ></H1
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86 ><P
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87 >A raw binary is simply a string of bytes. There are no headers or other
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88 niceties. Both LWLINK and LWASM support generating raw binaries. ORG directives
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89 in the source code only serve to set the addresses that will be used for
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90 symbols but otherwise have no direct impact on the resulting binary.</P
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91 ></DIV
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92 ></DIV
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93 ><DIV
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94 CLASS="NAVFOOTER"
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95 ><HR
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96 ALIGN="LEFT"
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97 WIDTH="100%"><TABLE
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98 SUMMARY="Footer navigation table"
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99 WIDTH="100%"
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100 BORDER="0"
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101 CELLPADDING="0"
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102 CELLSPACING="0"
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103 ><TR
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104 ><TD
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105 WIDTH="33%"
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106 ALIGN="left"
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107 VALIGN="top"
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108 ><A
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109 HREF="c13.html"
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110 ACCESSKEY="P"
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111 >Prev</A
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112 ></TD
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113 ><TD
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114 WIDTH="34%"
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116 VALIGN="top"
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117 ><A
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118 HREF="index.html"
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119 ACCESSKEY="H"
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120 >Home</A
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121 ></TD
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122 ><TD
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123 WIDTH="33%"
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124 ALIGN="right"
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125 VALIGN="top"
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126 ><A
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127 HREF="x27.html"
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128 ACCESSKEY="N"
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129 >Next</A
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130 ></TD
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131 ></TR
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132 ><TR
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133 ><TD
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134 WIDTH="33%"
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135 ALIGN="left"
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136 VALIGN="top"
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137 >Introduction</TD
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138 ><TD
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139 WIDTH="34%"
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140 ALIGN="center"
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141 VALIGN="top"
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142 >&nbsp;</TD
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143 ><TD
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144 WIDTH="33%"
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145 ALIGN="right"
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146 VALIGN="top"
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147 >DECB Binaries</TD
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148 ></TR
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149 ></TABLE
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150 ></DIV
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151 ></BODY
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152 ></HTML
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153 >