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annotate lwlink/main.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 ce1fdc8d6568
children 55c1f9a321e9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
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1 /*
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2 main.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 LWLINK.
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6
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7 LWLINK 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 Implements the program startup code
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22
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23 */
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24
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25 #include <errno.h>
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26 #include <stdio.h>
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27 #include <stdlib.h>
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28 #include <unistd.h>
2
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29 #include <string.h>
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30
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31 #include <lw_cmdline.h>
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32
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33 #include "lwlink.h"
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34
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35 char *program_name;
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36
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37 // command line option handling
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38 #define PROGVER "lwlink from " PACKAGE_STRING
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39
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40 static int parse_opts(int key, char *arg, void *state)
0
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41 {
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42 switch (key)
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43 {
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44 case 'o':
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45 // output
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46 outfile = arg;
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47 break;
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48
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49 case 's':
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50 // script file
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51 scriptfile = arg;
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52 break;
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53
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54 case 'd':
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55 // debug
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56 debug_level++;
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57 break;
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58
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59 case 'e':
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60 // entry symbol
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61 entrysym = arg;
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62 break;
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63
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64 case 'b':
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65 // decb output
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66 outformat = OUTPUT_DECB;
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67 break;
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68
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69 case 'r':
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70 // raw binary output
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71 outformat = OUTPUT_RAW;
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72 break;
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73
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74 case 'f':
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75 // output format
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76 if (!strcasecmp(arg, "decb"))
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77 outformat = OUTPUT_DECB;
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78 else if (!strcasecmp(arg, "raw"))
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79 outformat = OUTPUT_RAW;
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80 else if (!strcasecmp(arg, "lwex0") || !strcasecmp(arg, "lwex"))
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81 outformat = OUTPUT_LWEX0;
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82 else if (!strcasecmp(arg, "os9"))
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83 outformat = OUTPUT_OS9;
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84 else
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85 {
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86 fprintf(stderr, "Invalid output format: %s\n", arg);
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87 exit(1);
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88 }
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89 break;
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90 case lw_cmdline_key_end:
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91 // done; sanity check
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92 if (!outfile)
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93 outfile = "a.out";
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94 break;
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95
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96 case 'l':
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97 add_input_library(arg);
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98 break;
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99
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100 case 'L':
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101 add_library_search(arg);
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102 break;
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103
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104 case 0x100:
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105 add_section_base(arg);
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106 break;
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107
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108 case 0x101:
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109 sysroot = arg;
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110 break;
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111
0
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112 case 'm':
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113 map_file = arg;
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114 break;
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115
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116 case lw_cmdline_key_arg:
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117 add_input_file(arg);
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118 break;
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119
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120 default:
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121 return lw_cmdline_err_unknown;
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122 }
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123 return 0;
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124 }
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125
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126 static struct lw_cmdline_options options[] =
0
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127 {
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128 { "output", 'o', "FILE", 0,
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129 "Output to FILE"},
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130 { "debug", 'd', 0, 0,
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131 "Set debug mode"},
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132 { "format", 'f', "TYPE", 0,
148
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133 "Select output format: decb, raw, lwex, os9"},
0
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134 { "decb", 'b', 0, 0,
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135 "Generate DECB .bin format output, equivalent of --format=decb"},
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136 { "raw", 'r', 0, 0,
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137 "Generate raw binary format output, equivalent of --format=raw"},
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138 { "script", 's', "FILE", 0,
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139 "Specify the linking script (overrides the built in defaults)"},
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140 { "library", 'l', "LIBSPEC", 0,
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141 "Read library libLIBSPEC.a from the search path" },
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142 { "library-path", 'L', "DIR", 0,
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143 "Add DIR to the library search path" },
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144 { "section-base", 0x100, "SECT=BASE", 0,
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145 "Load section SECT at BASE" },
183
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146 { "entry", 'e', "SYM", 0,
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147 "Specify SYM as program entry point" },
179
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148 { "sysroot", 0x101, "DIR", 0,
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149 "Specify the path to replace an initial = with in library paths" },
0
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150 { "map", 'm', "FILE", 0,
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151 "Output informaiton about the link" },
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152 { 0 }
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153 };
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154
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155 static struct lw_cmdline_parser cmdline_parser =
0
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156 {
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157 options,
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158 parse_opts,
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159 "INPUTFILE ...",
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160 "lwlink, a HD6309 and MC6809 cross-linker",
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161 PROGVER
0
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162 };
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163
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164 extern void read_files(void);
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165 extern void setup_script(void);
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166 extern void resolve_files(void);
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167 extern void resolve_sections(void);
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168 extern void generate_symbols(void);
0
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169 extern void resolve_references(void);
236
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170 extern void resolve_padding(void);
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171 extern void do_output(void);
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172 extern void display_map(void);
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173
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174 // main function; parse command line, set up assembler state, and run the
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175 // assembler on the first file
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176 int main(int argc, char **argv)
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177 {
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178 program_name = argv[0];
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179
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180 lw_cmdline_parse(&cmdline_parser, argc, argv, 0, 0, NULL);
0
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181 if (ninputfiles == 0)
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182 {
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183 fprintf(stderr, "No input files\n");
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184 exit(1);
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185 }
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186
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187 unlink(outfile);
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188
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189 // handle the linker script
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190 setup_script();
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191
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192 // read the input files
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193 read_files();
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194
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195 // trace unresolved references and determine which non-forced
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196 // objects must be included
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197 resolve_files();
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198
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199 // resolve section bases and section order
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200 resolve_sections();
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201
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202 // generate symbols
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203 generate_symbols();
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204
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205 // resolve incomplete references
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206 resolve_references();
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207
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208 // resolve section padding bits
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209 resolve_padding();
0
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210
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211 // do the actual output
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212 do_output();
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213
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214 // display/output the link map
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215 if (map_file)
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216 display_map();
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217
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218 exit(0);
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219 }