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annotate lwlink/main.c @ 377:67373a053c49

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Add ?rts target for branch instructions Add a ?rts target for branch instructions, which brances to the nearest RTS or inverts the branch logic to branch around a generated RTS. Activated by a pragma "qrts". Thanks to Erik G <erik@6809.org> for the patch.
author William Astle <lost@l-w.ca>
date Mon, 13 Jul 2015 20:50:02 -0600
parents 4130ffdeb5c8
children 221b5f58d8ad
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>
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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 #include <lw_version.h>
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33
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34 #include "lwlink.h"
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35
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36 char *program_name;
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37
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38 // command line option handling
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39 #define PROGVER "lwlink from " PACKAGE_STRING
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40
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41 static int parse_opts(int key, char *arg, void *state)
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42 {
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43 switch (key)
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44 {
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45 case 'o':
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46 // output
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47 outfile = arg;
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48 break;
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49
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50 case 's':
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51 // script file
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52 scriptfile = arg;
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53 break;
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54
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55 case 'd':
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56 // debug
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57 debug_level++;
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58 break;
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59
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60 case 'e':
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61 // entry symbol
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62 entrysym = arg;
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63 break;
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64
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65 case 'b':
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66 // decb output
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67 outformat = OUTPUT_DECB;
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68 break;
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69
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70 case 'r':
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71 // raw binary output
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72 outformat = OUTPUT_RAW;
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73 break;
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74
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75 case 'f':
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76 // output format
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77 if (!strcasecmp(arg, "decb"))
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78 outformat = OUTPUT_DECB;
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79 else if (!strcasecmp(arg, "raw"))
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80 outformat = OUTPUT_RAW;
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81 else if (!strcasecmp(arg, "lwex0") || !strcasecmp(arg, "lwex"))
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82 outformat = OUTPUT_LWEX0;
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83 else if (!strcasecmp(arg, "os9"))
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84 outformat = OUTPUT_OS9;
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85 else if (!strcasecmp(arg, "srec"))
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86 outformat = OUTPUT_SREC;
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87 else
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88 {
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89 fprintf(stderr, "Invalid output format: %s\n", arg);
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90 exit(1);
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91 }
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92 break;
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93 case lw_cmdline_key_end:
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94 // done; sanity check
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95 if (!outfile)
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96 outfile = "a.out";
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97 break;
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98
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99 case 'l':
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100 add_input_library(arg);
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101 break;
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102
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103 case 'L':
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104 add_library_search(arg);
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105 break;
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106
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107 case 0x100:
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108 add_section_base(arg);
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109 break;
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110
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111 case 0x101:
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112 sysroot = arg;
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113 break;
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114
0
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115 case 'm':
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116 map_file = arg;
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117 break;
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118
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119 case lw_cmdline_key_arg:
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120 add_input_file(arg);
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121 break;
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122
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123 default:
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124 return lw_cmdline_err_unknown;
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125 }
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126 return 0;
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127 }
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128
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129 static struct lw_cmdline_options options[] =
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130 {
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131 { "output", 'o', "FILE", 0,
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132 "Output to FILE"},
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133 { "debug", 'd', 0, 0,
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134 "Set debug mode"},
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135 { "format", 'f', "TYPE", 0,
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136 "Select output format: decb, raw, lwex, os9, srec"},
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137 { "decb", 'b', 0, 0,
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138 "Generate DECB .bin format output, equivalent of --format=decb"},
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139 { "raw", 'r', 0, 0,
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140 "Generate raw binary format output, equivalent of --format=raw"},
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141 { "script", 's', "FILE", 0,
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142 "Specify the linking script (overrides the built in defaults)"},
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143 { "library", 'l', "LIBSPEC", 0,
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144 "Read library libLIBSPEC.a from the search path" },
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145 { "library-path", 'L', "DIR", 0,
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146 "Add DIR to the library search path" },
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147 { "section-base", 0x100, "SECT=BASE", 0,
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148 "Load section SECT at BASE" },
183
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149 { "entry", 'e', "SYM", 0,
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150 "Specify SYM as program entry point" },
179
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151 { "sysroot", 0x101, "DIR", 0,
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152 "Specify the path to replace an initial = with in library paths" },
0
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153 { "map", 'm', "FILE", 0,
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154 "Output informaiton about the link" },
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155 { 0 }
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156 };
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157
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158 static struct lw_cmdline_parser cmdline_parser =
0
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159 {
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160 options,
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161 parse_opts,
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162 "INPUTFILE ...",
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163 "lwlink, a HD6309 and MC6809 cross-linker",
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164 PROGVER
0
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165 };
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166
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167 extern void read_files(void);
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168 extern void setup_script(void);
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169 extern void resolve_files(void);
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170 extern void resolve_sections(void);
234
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171 extern void generate_symbols(void);
0
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172 extern void resolve_references(void);
236
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173 extern void resolve_padding(void);
0
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174 extern void do_output(void);
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175 extern void display_map(void);
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176
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177 // main function; parse command line, set up assembler state, and run the
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178 // assembler on the first file
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179 int main(int argc, char **argv)
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180 {
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181 program_name = argv[0];
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182
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183 lw_cmdline_parse(&cmdline_parser, argc, argv, 0, 0, NULL);
0
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184 if (ninputfiles == 0)
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185 {
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186 fprintf(stderr, "No input files\n");
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187 exit(1);
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188 }
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189
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190 unlink(outfile);
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191
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192 // handle the linker script
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193 setup_script();
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194
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195 // read the input files
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196 read_files();
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197
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198 // trace unresolved references and determine which non-forced
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199 // objects must be included
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200 resolve_files();
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201
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202 // resolve section bases and section order
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203 resolve_sections();
234
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204
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205 // generate symbols
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206 generate_symbols();
0
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207
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208 // resolve incomplete references
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209 resolve_references();
236
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210
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211 // resolve section padding bits
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212 resolve_padding();
0
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213
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214 // do the actual output
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215 do_output();
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216
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217 // display/output the link map
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218 if (map_file)
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219 display_map();
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220
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221 exit(0);
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222 }