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339
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1 /*
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2 readfiles.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 Reads input files
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22
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23 */
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24
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25 #include <config.h>
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26
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27 #include <argp.h>
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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 void read_lwobj16v0(fileinfo_t *fn);
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37 void read_lwar1v(fileinfo_t *fn);
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38
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39 /*
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40 The logic of reading the entire file into memory is simple. All the symbol
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41 names in the file are NUL terminated strings and can be used directly without
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42 making additional copies.
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43 */
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44 void read_file(fileinfo_t *fn)
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45 {
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46 if (!memcmp(fn -> filedata, "LWOBJ16", 8))
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47 {
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48 // read v0 LWOBJ16 file
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49 read_lwobj16v0(fn);
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50 }
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51 else if (!memcmp(fn -> filedata, "LWAR1V", 6))
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52 {
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53 // archive file
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54 read_lwar1v(fn);
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55 }
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56 else
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57 {
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58 fprintf(stderr, "%s: unknown file format\n", fn -> filename);
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59 exit(1);
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60 }
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61 }
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62
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63 void read_files(void)
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64 {
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65 int i;
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66 long size;
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67 FILE *f;
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68 long bread;
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69 for (i = 0; i < ninputfiles; i++)
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70 {
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71 if (inputfiles[i] -> islib)
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72 {
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73 char *tf;
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74 int s;
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75 int j;
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76
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77 f = NULL;
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78
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79 for (j = 0; j < nlibdirs; j++)
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80 {
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81 s = strlen(libdirs[j]) + 7 + strlen(inputfiles[i] -> filename);
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82 tf = lw_malloc(s + 1);
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83 sprintf(tf, "%s/lib%s.a", libdirs[j], inputfiles[i] -> filename);
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84 f = fopen(tf, "rb");
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85 if (!f)
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86 {
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87 free(tf);
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88 continue;
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89 }
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90 free(tf);
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91 break;
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92 }
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93 if (!f)
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94 {
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95 fprintf(stderr, "Can't open library: -l%s\n", inputfiles[i] -> filename);
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96 exit(1);
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97 }
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98 }
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99 else
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100 {
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101 f = fopen(inputfiles[i] -> filename, "rb");
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102 if (!f)
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103 {
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104 fprintf(stderr, "Can't open file %s:", inputfiles[i] -> filename);
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105 perror("");
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106 exit(1);
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107 }
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108 }
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109 fseek(f, 0, SEEK_END);
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110 size = ftell(f);
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111 rewind(f);
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112
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113 inputfiles[i] -> filedata = lw_malloc(size);
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114 inputfiles[i] -> filesize = size;
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115
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116 bread = fread(inputfiles[i] -> filedata, 1, size, f);
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117 if (bread < size)
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118 {
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119 fprintf(stderr, "Short read on file %s (%ld/%ld):", inputfiles[i] -> filename, bread, size);
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120 perror("");
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121 exit(1);
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122 }
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123
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124 fclose(f);
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125
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126 read_file(inputfiles[i]);
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127 }
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128 }
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129
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130 // this macro is used to bail out if we run off the end of the file data
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131 // while parsing - it keeps the code below cleaner
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132 #define NEXTBYTE() do { cc++; if (cc > fn -> filesize) { fprintf(stderr, "%s: invalid file format\n", fn -> filename); exit(1); } } while (0)
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133 // this macro is used to refer to the current byte in the stream
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134 #define CURBYTE() (fn -> filedata[cc < fn -> filesize ? cc : fn -> filesize - 1])
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135 // this one will leave the input pointer past the trailing NUL
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136 #define CURSTR() read_lwobj16v0_str(&cc, fn)
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137 unsigned char *read_lwobj16v0_str(long *cc1, fileinfo_t *fn)
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138 {
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139 int cc = *cc1;
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140 unsigned char *fp;
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141 fp = &CURBYTE();
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142 while (CURBYTE())
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143 NEXTBYTE();
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144 NEXTBYTE();
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145 *cc1 = cc;
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146 return fp;
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147 }
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148 // the function below can be switched to dealing with data coming from a
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149 // source other than an in-memory byte pool by adjusting the input data
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150 // in "fn" and the above two macros
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151
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152 void read_lwobj16v0(fileinfo_t *fn)
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153 {
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154 unsigned char *fp;
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155 long cc;
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156 section_t *s;
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157 int val;
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158 symtab_t *se;
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159
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160 // start reading *after* the magic number
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161 cc = 8;
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162
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163 // init data
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164 fn -> sections = NULL;
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165 fn -> nsections = 0;
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166
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167 while (1)
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168 {
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169 // NEXTBYTE();
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170 // bail out if no more sections
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171 if (!(CURBYTE()))
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172 break;
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173
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174 fp = CURSTR();
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175
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176 // we now have a section name in fp
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177 // create new section entry
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178 fn -> sections = lw_realloc(fn -> sections, sizeof(section_t) * (fn -> nsections + 1));
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179 s = &(fn -> sections[fn -> nsections]);
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180 fn -> nsections += 1;
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181
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182 s -> localsyms = NULL;
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183 s -> flags = 0;
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184 s -> codesize = 0;
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185 s -> name = fp;
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186 s -> loadaddress = 0;
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187 s -> localsyms = NULL;
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188 s -> exportedsyms = NULL;
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189 s -> incompletes = NULL;
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190 s -> processed = 0;
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191 s -> file = fn;
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192
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193 // read flags
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194 while (CURBYTE())
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195 {
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196 switch (CURBYTE())
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197 {
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198 case 0x01:
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199 s -> flags |= SECTION_BSS;
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200 break;
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201
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202 default:
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203 fprintf(stderr, "%s (%s): unrecognized section flag %02X\n", fn -> filename, s -> name, (int)(CURBYTE()));
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204 exit(1);
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205 }
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206 NEXTBYTE();
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207 }
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208 // skip NUL terminating flags
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209 NEXTBYTE();
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210
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211 // now parse the local symbol table
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212 while (CURBYTE())
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213 {
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214 fp = CURSTR();
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215
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216 // fp is the symbol name
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217 val = (CURBYTE()) << 8;
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218 NEXTBYTE();
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219 val |= (CURBYTE());
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220 NEXTBYTE();
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221 // val is now the symbol value
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222
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223 // create symbol table entry
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224 se = lw_malloc(sizeof(symtab_t));
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225 se -> next = s -> localsyms;
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226 s -> localsyms = se;
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227 se -> sym = fp;
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228 se -> offset = val;
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229 }
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230 // skip terminating NUL
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231 NEXTBYTE();
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232
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233 // now parse the exported symbol table
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234 while (CURBYTE())
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235 {
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236 fp = CURSTR();
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237
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238 // fp is the symbol name
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239 val = (CURBYTE()) << 8;
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240 NEXTBYTE();
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241 val |= (CURBYTE());
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242 NEXTBYTE();
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243 // val is now the symbol value
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244
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245 // create symbol table entry
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246 se = lw_malloc(sizeof(symtab_t));
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247 se -> next = s -> exportedsyms;
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248 s -> exportedsyms = se;
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249 se -> sym = fp;
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250 se -> offset = val;
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251 }
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252 // skip terminating NUL
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253 NEXTBYTE();
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254
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255 // now parse the incomplete references and make a list of
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256 // external references that need resolution
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257 while (CURBYTE())
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258 {
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259 reloc_t *rp;
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260 lw_expr_term_t *term;
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261
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262 // we have a reference
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263 rp = lw_malloc(sizeof(reloc_t));
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264 rp -> next = s -> incompletes;
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265 s -> incompletes = rp;
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266 rp -> offset = 0;
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267 rp -> expr = lw_expr_stack_create();
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268 rp -> flags = RELOC_NORM;
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269
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270 // parse the expression
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271 while (CURBYTE())
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272 {
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273 int tt = CURBYTE();
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274 NEXTBYTE();
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275 switch (tt)
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276 {
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277 case 0xFF:
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278 // a flag specifier
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279 tt = CURBYTE();
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280 rp -> flags = tt;
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281 NEXTBYTE();
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282 term = NULL;
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283 break;
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284
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285 case 0x01:
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286 // 16 bit integer
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287 tt = CURBYTE() << 8;
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288 NEXTBYTE();
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289 tt |= CURBYTE();
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290 NEXTBYTE();
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291 // normalize for negatives...
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292 if (tt > 0x7fff)
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293 tt -= 0x10000;
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294 term = lw_expr_term_create_int(tt);
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295 break;
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296
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297 case 0x02:
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298 // external symbol reference
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299 term = lw_expr_term_create_sym(CURSTR(), 0);
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300 break;
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301
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302 case 0x03:
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303 // internal symbol reference
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304 term = lw_expr_term_create_sym(CURSTR(), 1);
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305 break;
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306
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307 case 0x04:
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308 // operator
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309 term = lw_expr_term_create_oper(CURBYTE());
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310 NEXTBYTE();
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311 break;
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312
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313 case 0x05:
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314 // section base reference (NULL internal reference is
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315 // the section base address
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316 term = lw_expr_term_create_sym(NULL, 1);
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317 break;
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318
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319 default:
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320 fprintf(stderr, "%s (%s): bad relocation expression (%02X)\n", fn -> filename, s -> name, tt);
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321 exit(1);
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322 }
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323 if (term)
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324 {
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325 lw_expr_stack_push(rp -> expr, term);
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326 lw_expr_term_free(term);
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327 }
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328 }
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329 // skip the NUL
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330 NEXTBYTE();
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331
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332 // fetch the offset
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333 rp -> offset = CURBYTE() << 8;
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334 NEXTBYTE();
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335 rp -> offset |= CURBYTE() & 0xff;
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336 NEXTBYTE();
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337 }
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338 // skip the NUL terminating the relocations
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339 NEXTBYTE();
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340
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341 // now set code location and size and verify that the file
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342 // contains data going to the end of the code (if !SECTION_BSS)
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343 s -> codesize = CURBYTE() << 8;
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344 NEXTBYTE();
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345 s -> codesize |= CURBYTE();
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346 NEXTBYTE();
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347
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348 s -> code = &(CURBYTE());
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349
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350 // skip the code if we're not in a BSS section
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351 if (!(s -> flags & SECTION_BSS))
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352 {
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353 int i;
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354 for (i = 0; i < s -> codesize; i++)
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355 NEXTBYTE();
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356 }
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357 }
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358 }
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359
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360 /*
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361 Read an archive file - this will create a "sub" record and farm out the
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362 parsing of the sub files to the regular file parsers
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363
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364 The archive file format consists of the 6 byte magic number followed by a
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365 series of records as follows:
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366
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367 - NUL terminated file name
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368 - 32 bit file length in big endian order
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369 - the file data
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370
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371 An empty file name indicates the end of the file.
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372
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373 */
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374 void read_lwar1v(fileinfo_t *fn)
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375 {
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376 unsigned long cc = 6;
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377 unsigned long flen;
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378 unsigned long l;
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379 for (;;)
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380 {
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381 if (cc >= fn -> filesize || !(fn -> filedata[cc]))
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382 return;
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383
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384 for (l = cc; cc < fn -> filesize && fn -> filedata[cc]; cc++)
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385 /* do nothing */ ;
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386
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387 cc++;
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388
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389 if (cc >= fn -> filesize)
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390 {
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391 fprintf(stderr, "Malformed archive file %s.\n", fn -> filename);
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392 exit(1);
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393 }
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394
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395 if (cc + 4 > fn -> filesize)
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396 return;
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397
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398 flen = (fn -> filedata[cc++] << 24);
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399 flen |= (fn -> filedata[cc++] << 16);
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400 flen |= (fn -> filedata[cc++] << 8);
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401 flen |= (fn -> filedata[cc++]);
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402
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403 if (flen == 0)
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404 return;
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405
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406 if (cc + flen > fn -> filesize)
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407 {
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408 fprintf(stderr, "Malformed archive file %s.\n", fn -> filename);
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409 exit(1);
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410 }
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411
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412 // add the "sub" input file
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413 fn -> subs = lw_realloc(fn -> subs, sizeof(fileinfo_t *) * (fn -> nsubs + 1));
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414 fn -> subs[fn -> nsubs] = lw_malloc(sizeof(fileinfo_t));
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415 memset(fn -> subs[fn -> nsubs], 0, sizeof(fileinfo_t));
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416 fn -> subs[fn -> nsubs] -> filedata = fn -> filedata + cc;
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417 fn -> subs[fn -> nsubs] -> filesize = flen;
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418 fn -> subs[fn -> nsubs] -> filename = lw_strdup(fn -> filedata + l);
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419 fn -> subs[fn -> nsubs] -> parent = fn;
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420 fn -> subs[fn -> nsubs] -> forced = fn -> forced;
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421 read_file(fn -> subs[fn -> nsubs]);
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422 fn -> nsubs++;
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423 cc += flen;
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424 }
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425 }
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