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Add operandsizewarning pragma Add operandsizewarning pragma that will raise warnings for certain operands if the operand size could be smaller. (Long branch used instead of short branch, for instance.)
author William Astle <lost@l-w.ca>
date Fri, 16 Feb 2018 22:53:46 -0700
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455
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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 >Object Files</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="OS9 Modules"
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17 HREF="x46.html"><LINK
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18 REL="NEXT"
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19 TITLE="LWASM"
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20 HREF="c62.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="x46.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="c62.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="AEN54"
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77 >2.7. Object Files</A
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78 ></H1
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79 ><P
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80 >LWASM supports generating a proprietary object file format which is
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81 described in <A
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82 HREF="c1068.html"
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83 >Chapter 6</A
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84 >. LWLINK is then used to link these
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85 object files into a final binary in any of LWLINK's supported binary
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86 formats.</P
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87 ><P
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88 >Object files also support the concept of sections which are not valid
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89 for other output types. This allows related code from each object file
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90 linked to be collapsed together in the final binary.</P
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91 ><P
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92 >Object files are very flexible in that they allow references that are not
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93 known at assembly time to be resolved at link time. However, because the
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94 addresses of such references are not known at assembly time, there is no way
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95 for the assembler to deduce that an eight bit addressing mode is possible.
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96 That means the assember will default to using sixteen bit addressing
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97 whenever an external or cross-section reference is used.</P
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98 ><P
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99 >As of LWASM 2.4, it is possible to force direct page addressing for an
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100 external reference. Care must be taken to ensure the resulting addresses
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101 are really in the direct page since the linker does not know what the direct
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102 page is supposed to be and does not emit errors for byte overflows.</P
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103 ><P
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104 >It is also possible to use external references in an eight bit immediate
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105 mode instruction. In this case, only the low order eight bits will be used.
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106 Again, no byte overflows will be flagged.</P
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107 ></DIV
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108 ><DIV
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109 CLASS="NAVFOOTER"
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110 ><HR
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111 ALIGN="LEFT"
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112 WIDTH="100%"><TABLE
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113 SUMMARY="Footer navigation table"
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114 WIDTH="100%"
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115 BORDER="0"
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116 CELLPADDING="0"
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117 CELLSPACING="0"
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118 ><TR
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119 ><TD
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120 WIDTH="33%"
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121 ALIGN="left"
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122 VALIGN="top"
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123 ><A
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124 HREF="x46.html"
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125 ACCESSKEY="P"
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126 >Prev</A
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127 ></TD
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128 ><TD
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129 WIDTH="34%"
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130 ALIGN="center"
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131 VALIGN="top"
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132 ><A
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133 HREF="index.html"
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134 ACCESSKEY="H"
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135 >Home</A
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136 ></TD
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137 ><TD
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138 WIDTH="33%"
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139 ALIGN="right"
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140 VALIGN="top"
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141 ><A
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142 HREF="c62.html"
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143 ACCESSKEY="N"
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144 >Next</A
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145 ></TD
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146 ></TR
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147 ><TR
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148 ><TD
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149 WIDTH="33%"
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150 ALIGN="left"
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151 VALIGN="top"
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152 >OS9 Modules</TD
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153 ><TD
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154 WIDTH="34%"
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155 ALIGN="center"
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156 VALIGN="top"
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157 ><A
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158 HREF="c21.html"
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159 ACCESSKEY="U"
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160 >Up</A
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161 ></TD
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162 ><TD
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163 WIDTH="33%"
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164 ALIGN="right"
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165 VALIGN="top"
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166 >LWASM</TD
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167 ></TR
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168 ></TABLE
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169 ></DIV
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170 ></BODY
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171 ></HTML
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172 >