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339
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1 /*
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2 script.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 Read and parse linker scripts
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22 */
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23
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24 #include <config.h>
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25
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26 #include <errno.h>
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27 #include <stdio.h>
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28 #include <stdlib.h>
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29 #include <string.h>
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30
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31 #include "lwlink.h"
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32 #include "util.h"
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33
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34 // the built-in DECB target linker script
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35 static char *decb_script =
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36 "section init load 2000\n"
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37 "section code\n"
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38 "section *,!bss\n"
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39 "section *,bss\n"
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40 "entry 2000\n"
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41 ;
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42
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43 // the built-in RAW target linker script
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44 static char *raw_script =
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45 "section init load 0000\n"
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46 "section code\n"
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47 "section *,!bss\n"
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48 "section *,bss\n"
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49 ;
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50
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51 static char *lwex0_script =
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52 "section init load 0100\n"
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53 "section .text\n"
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54 "section .data\n"
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55 "section *,!bss\n"
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56 "section *,bss\n"
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57 "entry __start\n"
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58 "stacksize 0100\n" // default 256 byte stack
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59 ;
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60
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61 // the "simple" script
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62 static char *simple_script =
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63 "section *,!bss\n"
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64 "section *,bss\n"
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65 ;
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66
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67 linkscript_t linkscript = { 0, NULL, -1 };
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68
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69 void setup_script()
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70 {
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71 char *script, *oscript;
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72 long size;
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73
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74 // read the file if needed
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75 if (scriptfile)
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76 {
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77 FILE *f;
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78 long bread;
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79
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80 f = fopen(scriptfile, "rb");
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81 if (!f)
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82 {
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83 fprintf(stderr, "Can't open file %s:", scriptfile);
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84 perror("");
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85 exit(1);
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86 }
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87 fseek(f, 0, SEEK_END);
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88 size = ftell(f);
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89 rewind(f);
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90
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91 script = lw_malloc(size + 2);
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92
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93 bread = fread(script, 1, size, f);
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94 if (bread < size)
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95 {
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96 fprintf(stderr, "Short read on file %s (%ld/%ld):", scriptfile, bread, size);
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97 perror("");
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98 exit(1);
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99 }
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100 fclose(f);
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101
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102 script[size] = '\n';
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103 script[size + 1] = '\0';
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104 }
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105 else
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106 {
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107 // fetch defaults based on output mode
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108 switch (outformat)
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109 {
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110 case OUTPUT_RAW:
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111 script = raw_script;
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112 break;
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113
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114 case OUTPUT_DECB:
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115 script = decb_script;
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116 break;
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117
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118 case OUTPUT_LWEX0:
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119 script = lwex0_script;
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120 break;
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121
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122 default:
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123 script = simple_script;
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124 break;
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125 }
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126
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127 size = strlen(script);
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128 if (nscriptls)
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129 {
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130 char *rscript;
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131 int i;
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132 // prepend the "extra" script lines
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133 for (i = 0; i < nscriptls; i++)
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134 size += strlen(scriptls[i]) + 1;
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135
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136 rscript = lw_malloc(size + 1);
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137 oscript = rscript;
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138 for (i = 0; i < nscriptls; i++)
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139 {
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140 oscript += sprintf(oscript, "%s\n", scriptls[i]);
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141 }
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142 strcpy(oscript, script);
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143 script = rscript;
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144 }
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145 }
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146
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147 if (outformat == OUTPUT_LWEX0)
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148 linkscript.stacksize = 0x100;
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149
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150 oscript = script;
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151 // now parse the script file
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152 while (*script)
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153 {
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154 char *ptr, *ptr2, *line;
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155
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156 for (ptr = script; *ptr && *ptr != '\n' && *ptr != '\r'; ptr++)
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157 /* do nothing */ ;
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158
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159 line = lw_malloc(ptr - script + 1);
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160 memcpy(line, script, ptr - script);
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161 line[ptr - script] = '\0';
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162
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163 // skip line terms
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164 for (script = ptr + 1; *script == '\n' || *script == '\r'; script++)
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165 /* do nothing */ ;
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166
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167 // ignore leading whitespace
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168 for (ptr = line; *ptr && isspace(*ptr); ptr++)
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169 /* do nothing */ ;
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170
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171 // ignore blank lines
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172 if (!*ptr)
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173 continue;
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174
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175 for (ptr = line; *ptr && !isspace(*ptr); ptr++)
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176 /* do nothing */ ;
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177
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178 // now ptr points to the char past the first word
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179 // NUL it out
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180 if (*ptr)
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181 *ptr++ = '\0';
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182
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183 // skip spaces after the first word
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184 for ( ; *ptr && isspace(*ptr); ptr++)
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185 /* do nothing */ ;
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186
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187 if (!strcmp(line, "pad"))
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188 {
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189 // padding
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190 // parse the hex number and stow it
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191 linkscript.padsize = strtol(ptr, NULL, 16);
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192 if (linkscript.padsize < 0)
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193 linkscript.padsize = 0;
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194 }
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195 else if (!strcmp(line, "stacksize"))
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196 {
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197 // stack size for targets that support it
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198 // parse the hex number and stow it
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199 linkscript.padsize = strtol(ptr, NULL, 16);
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200 if (linkscript.stacksize < 0)
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201 linkscript.stacksize = 0x100;
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202 }
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203 else if (!strcmp(line, "entry"))
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204 {
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205 int eaddr;
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206
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207 eaddr = strtol(ptr, &ptr2, 16);
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208 if (*ptr2)
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209 {
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210 linkscript.execaddr = -1;
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211 linkscript.execsym = lw_strdup(ptr);
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212 }
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213 else
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214 {
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215 linkscript.execaddr = eaddr;
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216 linkscript.execsym = NULL;
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217 }
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218 }
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219 else if (!strcmp(line, "section"))
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220 {
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221 // section
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222 // parse out the section name and flags
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223 for (ptr2 = ptr; *ptr2 && !isspace(*ptr2); ptr2++)
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224 /* do nothing */ ;
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225
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226 if (*ptr2)
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227 *ptr2++ = '\0';
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228
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229 while (*ptr2 && isspace(*ptr2))
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230 ptr2++;
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231
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232 // ptr now points to the section name and flags and ptr2
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233 // to the first non-space character following
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234
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235 // then look for "load <addr>" clause
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236 if (*ptr2)
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237 {
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238 if (!strncmp(ptr2, "load", 4))
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239 {
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240 ptr2 += 4;
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241 while (*ptr2 && isspace(*ptr2))
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242 ptr2++;
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243
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244 }
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245 else
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246 {
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247 fprintf(stderr, "%s: bad script\n", scriptfile);
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248 exit(1);
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249 }
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250 }
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251
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252 // now ptr2 points to the load address if there is one
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253 // or NUL if not
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254 linkscript.lines = lw_realloc(linkscript.lines, sizeof(struct scriptline_s) * (linkscript.nlines + 1));
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255
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256 linkscript.lines[linkscript.nlines].noflags = 0;
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257 linkscript.lines[linkscript.nlines].yesflags = 0;
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258 if (*ptr2)
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259 linkscript.lines[linkscript.nlines].loadat = strtol(ptr2, NULL, 16);
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260 else
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261 linkscript.lines[linkscript.nlines].loadat = -1;
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262 for (ptr2 = ptr; *ptr2 && *ptr2 != ','; ptr2++)
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263 /* do nothing */ ;
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264 if (*ptr2)
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265 {
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266 *ptr2++ = '\0';
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267 if (!strcmp(ptr2, "!bss"))
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268 {
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269 linkscript.lines[linkscript.nlines].noflags = SECTION_BSS;
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270 }
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271 else if (!strcmp(ptr2, "bss"))
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272 {
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273 linkscript.lines[linkscript.nlines].yesflags = SECTION_BSS;
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274 }
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275 else
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276 {
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277 fprintf(stderr, "%s: bad script\n", scriptfile);
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278 exit(1);
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279 }
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280 }
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281 if (ptr[0] == '*' && ptr[1] == '\0')
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282 linkscript.lines[linkscript.nlines].sectname = NULL;
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283 else
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284 linkscript.lines[linkscript.nlines].sectname = lw_strdup(ptr);
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285 linkscript.nlines++;
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286 }
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287 else
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288 {
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289 fprintf(stderr, "%s: bad script\n", scriptfile);
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290 exit(1);
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291 }
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292 lw_free(line);
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293 }
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294
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295 if (scriptfile || nscriptls)
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296 lw_free(oscript);
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297 }
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