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1 /*
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2 script.c
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300
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3 Copyright © 2009 William Astle
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299
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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 Read and parse linker scripts
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22 */
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23
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24 #ifdef HAVE_CONFIG_H
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25 #include "config.h"
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26 #endif
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27
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28 #include <errno.h>
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29 #include <stdio.h>
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30 #include <stdlib.h>
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31 #include <string.h>
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32
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33 #include "lwlink.h"
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34 #include "util.h"
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35
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36 // the built-in DECB target linker script
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37 static char *decb_script =
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38 "section init load at 2000\n"
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39 "section code\n"
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40 "section *,!bss\n"
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41 "section *,bss\n"
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303
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42 "entry 2000\n"
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299
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43 ;
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44
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45 // the built-in RAW target linker script
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46 static char *raw_script =
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47 "section init load at 0000\n"
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48 "section code\n"
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49 "section *,!bss\n"
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50 "section *,bss\n"
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51 ;
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52
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53 // the "simple" script
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54 static char *simple_script =
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55 "section *,!bss\n"
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56 "section *,bss\n"
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57 ;
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58
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59 linkscript_t linkscript = { 0, NULL, -1 };
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60
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61 void setup_script()
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62 {
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63 char *script;
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64 long size;
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65
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66 // read the file if needed
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67 if (scriptfile)
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68 {
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69 FILE *f;
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70 long bread;
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71
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72 f = fopen(scriptfile, "rb");
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73 if (!f)
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74 {
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75 fprintf(stderr, "Can't open file %s:", scriptfile);
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76 perror("");
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77 exit(1);
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78 }
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79 fseek(f, 0, SEEK_END);
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80 size = ftell(f);
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81 rewind(f);
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82
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83 script = lw_malloc(size + 2);
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84
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85 bread = fread(script, 1, size, f);
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86 if (bread < size)
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87 {
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88 fprintf(stderr, "Short read on file %s (%ld/%ld):", scriptfile, bread, size);
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89 perror("");
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90 exit(1);
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91 }
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92 fclose(f);
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93
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94 script[size] = '\n';
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95 script[size + 1] = '\0';
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96 }
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97 else
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98 {
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99 // fetch defaults based on output mode
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100 switch (outformat)
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101 {
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102 case OUTPUT_RAW:
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103 script = raw_script;
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104 break;
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105
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106 case OUTPUT_DECB:
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107 script = decb_script;
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108 break;
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109
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110 default:
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111 script = simple_script;
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112 break;
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113 }
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114
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115 size = strlen(script);
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116 }
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117
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118 // now parse the script file
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119 while (*script)
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120 {
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121 char *ptr, *ptr2, *line;
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122
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123 for (ptr = script; *ptr && *ptr != '\n' && *ptr != '\r'; ptr++)
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124 /* do nothing */ ;
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125
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126 line = lw_malloc(ptr - script + 1);
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127 memcpy(line, script, ptr - script);
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128 line[ptr - script] = '\0';
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129
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130 // skip line terms
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131 for (script = ptr + 1; *script == '\n' || *script == '\r'; script++)
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132 /* do nothing */ ;
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133
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134 // ignore leading whitespace
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135 for (ptr = line; *ptr && isspace(*ptr); ptr++)
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136 /* do nothing */ ;
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137
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138 // ignore blank lines
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139 if (!*ptr)
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140 continue;
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141
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142 for (ptr = line; *ptr && !isspace(*ptr); ptr++)
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143 /* do nothing */ ;
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144
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145 // now ptr points to the char past the first word
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146 // NUL it out
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147 if (*ptr)
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148 *ptr++ = '\0';
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149
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150 // skip spaces after the first word
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151 for ( ; *ptr && isspace(*ptr); ptr++)
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152 /* do nothing */ ;
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153
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154 if (!strcmp(line, "pad"))
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155 {
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156 // padding
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157 // parse the hex number and stow it
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158 linkscript.padsize = strtol(ptr, NULL, 16);
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159 if (linkscript.padsize < 0)
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160 linkscript.padsize = 0;
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161 }
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303
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162 else if (!strcmp(line, "entry"))
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163 {
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164 int eaddr;
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165
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166 eaddr = strtol(ptr, &ptr2, 16);
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167 if (*ptr2)
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168 {
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169 linkscript.execaddr = -1;
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170 linkscript.execsym = lw_strdup(ptr);
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171 }
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172 else
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173 {
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174 linkscript.execaddr = eaddr;
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175 linkscript.execsym = NULL;
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176 }
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177 }
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299
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178 else if (!strcmp(line, "section"))
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179 {
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180 // section
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181 // parse out the section name and flags
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182 for (ptr2 = ptr; *ptr2 && !isspace(*ptr2); ptr2++)
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183 /* do nothing */ ;
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184
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185 if (*ptr2)
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186 *ptr2++ = '\0';
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187
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188 while (*ptr2 && isspace(*ptr2))
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189 ptr2++;
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190
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191 // ptr now points to the section name and flags and ptr2
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192 // to the first non-space character following
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193
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194 // then look for "load <addr>" clause
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195 if (*ptr2)
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196 {
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197 if (!strncmp(ptr2, "load", 4))
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198 {
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199 ptr2 += 4;
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200 while (*ptr2 && isspace(*ptr2))
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201 ptr2++;
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202
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203 }
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204 else
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205 {
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206 fprintf(stderr, "%s: bad script\n", scriptfile);
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207 exit(1);
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208 }
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209 }
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210
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211 // now ptr2 points to the load address if there is one
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212 // or NUL if not
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213 linkscript.lines = lw_realloc(linkscript.lines, sizeof(struct scriptline_s) * (linkscript.nlines + 1));
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214
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215 linkscript.lines[linkscript.nlines].noflags = 0;
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216 linkscript.lines[linkscript.nlines].yesflags = 0;
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217 if (*ptr2)
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218 linkscript.lines[linkscript.nlines].loadat = strtol(ptr2, NULL, 16);
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219 else
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220 linkscript.lines[linkscript.nlines].loadat = -1;
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221 for (ptr2 = ptr; *ptr2 && *ptr2 != ','; ptr2++)
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222 /* do nothing */ ;
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223 if (*ptr2)
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224 {
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225 *ptr2++ = '\0';
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226 if (!strcmp(ptr2, "!bss"))
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227 {
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228 linkscript.lines[linkscript.nlines].noflags = SECTION_BSS;
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229 }
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230 else if (!strcmp(ptr2, "bss"))
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231 {
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232 linkscript.lines[linkscript.nlines].yesflags = SECTION_BSS;
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233 }
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234 else
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235 {
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236 fprintf(stderr, "%s: bad script\n", scriptfile);
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237 exit(1);
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238 }
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239 }
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301
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240 if (ptr[0] == '*' && ptr[1] == '\0')
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241 linkscript.lines[linkscript.nlines].sectname = NULL;
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242 else
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243 linkscript.lines[linkscript.nlines].sectname = lw_strdup(ptr);
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299
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244 linkscript.nlines++;
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245 }
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246 else
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247 {
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248 fprintf(stderr, "%s: bad script\n", scriptfile);
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249 exit(1);
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250 }
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251 lw_free(line);
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252 }
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253
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254 if (scriptfile)
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255 lw_free(script);
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256 }
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