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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 b30091890d62
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 >Intel Hex</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="UP"
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13 TITLE="Output Formats"
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14 HREF="c21.html"><LINK
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15 REL="PREVIOUS"
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16 TITLE="Motorola S-Record"
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17 HREF="x36.html"><LINK
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18 REL="NEXT"
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19 TITLE="OS9 Modules"
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20 HREF="x46.html"></HEAD
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21 ><BODY
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22 CLASS="SECTION"
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23 BGCOLOR="#FFFFFF"
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24 TEXT="#000000"
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25 LINK="#0000FF"
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26 VLINK="#840084"
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27 ALINK="#0000FF"
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28 ><DIV
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29 CLASS="NAVHEADER"
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30 ><TABLE
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31 SUMMARY="Header navigation table"
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32 WIDTH="100%"
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33 BORDER="0"
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34 CELLPADDING="0"
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35 CELLSPACING="0"
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36 ><TR
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37 ><TH
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38 COLSPAN="3"
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39 ALIGN="center"
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40 >LW Tool Chain</TH
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41 ></TR
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42 ><TR
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43 ><TD
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44 WIDTH="10%"
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45 ALIGN="left"
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46 VALIGN="bottom"
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47 ><A
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48 HREF="x36.html"
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49 ACCESSKEY="P"
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50 >Prev</A
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51 ></TD
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52 ><TD
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53 WIDTH="80%"
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54 ALIGN="center"
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55 VALIGN="bottom"
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56 >Chapter 2. Output Formats</TD
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57 ><TD
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58 WIDTH="10%"
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59 ALIGN="right"
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60 VALIGN="bottom"
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61 ><A
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62 HREF="x46.html"
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63 ACCESSKEY="N"
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64 >Next</A
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65 ></TD
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66 ></TR
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67 ></TABLE
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68 ><HR
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69 ALIGN="LEFT"
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70 WIDTH="100%"></DIV
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71 ><DIV
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72 CLASS="SECTION"
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73 ><H1
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74 CLASS="SECTION"
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75 ><A
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76 NAME="AEN41"
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77 >2.5. Intel Hex</A
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78 ></H1
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79 ><P
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80 >This ASCII format consists of a series of CR+LF terminated "records" of ASCII
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81 text. Each record has the following structure: a start-of-record character
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82 ":", a two-digit ASCII hex byte count, a four-digit ASCII hex address, a two-
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83 digit ASCII hex record type, an optional sequence of two-digit ASCII hex data
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84 values, and a two-digit ASCII hex checksum. The LW tool chain issues only 00,
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85 and 01 Intel Hex record types. Data records are limited to maximum of 16
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86 data bytes in length, and paragraph alignment of addresses is favored. The
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87 address sequence of the Intel hex records directly follows that of the source
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88 file; multiple ORG directives in the source code may result in out-of-sequence
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89 addresses in the Intel Hex output. </P
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90 ><P
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91 >Intel Hex format is the other standard ASCII format accepted by most memory
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92 device programming equipment, it and the Motorola S-Record format are used for
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93 similar purposes.</P
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94 ><P
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95 >LWASM can output this format since version 4.10.</P
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96 ></DIV
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97 ><DIV
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98 CLASS="NAVFOOTER"
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99 ><HR
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100 ALIGN="LEFT"
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101 WIDTH="100%"><TABLE
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102 SUMMARY="Footer navigation table"
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103 WIDTH="100%"
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104 BORDER="0"
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105 CELLPADDING="0"
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106 CELLSPACING="0"
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107 ><TR
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108 ><TD
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109 WIDTH="33%"
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110 ALIGN="left"
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111 VALIGN="top"
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112 ><A
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113 HREF="x36.html"
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114 ACCESSKEY="P"
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115 >Prev</A
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116 ></TD
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117 ><TD
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118 WIDTH="34%"
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119 ALIGN="center"
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120 VALIGN="top"
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121 ><A
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122 HREF="index.html"
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123 ACCESSKEY="H"
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124 >Home</A
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125 ></TD
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126 ><TD
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127 WIDTH="33%"
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128 ALIGN="right"
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129 VALIGN="top"
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130 ><A
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131 HREF="x46.html"
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132 ACCESSKEY="N"
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133 >Next</A
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134 ></TD
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135 ></TR
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136 ><TR
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137 ><TD
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138 WIDTH="33%"
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139 ALIGN="left"
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140 VALIGN="top"
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141 >Motorola S-Record</TD
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142 ><TD
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143 WIDTH="34%"
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144 ALIGN="center"
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145 VALIGN="top"
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146 ><A
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147 HREF="c21.html"
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148 ACCESSKEY="U"
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149 >Up</A
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150 ></TD
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151 ><TD
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152 WIDTH="33%"
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153 ALIGN="right"
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154 VALIGN="top"
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155 >OS9 Modules</TD
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156 ></TR
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157 ></TABLE
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158 ></DIV
b30091890d62 Add documentation of the new hex output formats.
William Astle <lost@l-w.ca>
parents:
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159 ></BODY
b30091890d62 Add documentation of the new hex output formats.
William Astle <lost@l-w.ca>
parents:
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160 ></HTML
b30091890d62 Add documentation of the new hex output formats.
William Astle <lost@l-w.ca>
parents:
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161 >