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annotate lwlink/main.c @ 236:ce1fdc8d6568

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Added ability to add padding after a section when linking. Added the ability for lwlink to automatically append padding bytes to the end of a section (once the section instances are merged). This behaviour is controlled by the link script. See the updated documentation for more information.
author William Astle <lost@l-w.ca>
date Sat, 11 Aug 2012 23:29:57 -0600
parents d389adbcc4ab
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
179
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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();
234
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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();
236
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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 }