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136
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1 /*
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2 objdump.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 A standalone program to dump an object file in a text form to stdout
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22
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23 */
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24
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25 #include <stdio.h>
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26 #include <stdlib.h>
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27
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28 #include "util.h"
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29
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30 #ifdef HAVE_CONFIG_H
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31 #include "config.h"
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32 #endif
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33
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34 void read_lwobj16v0(unsigned char *filedata, long filesize);
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35
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36 /*
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37 The logic of reading the entire file into memory is simple. All the symbol
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38 names in the file are NUL terminated strings and can be used directly without
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39 making additional copies.
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40 */
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41 int main(int argc, char **argv)
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42 {
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43 int i;
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44 long size;
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45 FILE *f;
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46 long bread;
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47 unsigned char *filedata;
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48
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49 if (argc != 2)
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50 {
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51 fprintf(stderr, "Must specify exactly one input file.\n");
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52 exit(1);
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53 }
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54
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55 f = fopen(argv[1], "rb");
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56 if (!f)
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57 {
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58 fprintf(stderr, "Can't open file %s:", argv[1]);
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59 perror("");
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60 exit(1);
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61 }
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62 fseek(f, 0, SEEK_END);
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63 size = ftell(f);
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64 rewind(f);
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65
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66 filedata = lw_malloc(size);
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67
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68 bread = fread(filedata, 1, size, f);
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69 if (bread < size)
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70 {
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71 fprintf(stderr, "Short read on file %s (%ld/%ld):", argv[1], bread, size);
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72 perror("");
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73 exit(1);
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74 }
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75
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76 fclose(f);
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77
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78 if (!memcmp(filedata, "LWOBJ16", 8))
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79 {
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80 // read v0 LWOBJ16 file
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81 read_lwobj16v0(filedata, size);
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82 }
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83 else
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84 {
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85 fprintf(stderr, "%s: unknown file format\n", argv[1]);
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86 exit(1);
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87 }
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88 exit(0);
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89 }
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90
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91 // this macro is used to bail out if we run off the end of the file data
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92 // while parsing - it keeps the code below cleaner
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93 #define NEXTBYTE() do { cc++; if (cc > filesize) { fprintf(stderr, "***invalid file format\n"); exit(1); } } while (0)
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94 // this macro is used to refer to the current byte in the stream
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95 #define CURBYTE() (filedata[cc < filesize ? cc : filesize - 1])
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96 // this one will leave the input pointer past the trailing NUL
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97 #define CURSTR() read_lwobj16v0_str(&cc, &filedata, filesize)
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98 unsigned char *read_lwobj16v0_str(long *cc1, unsigned char **filedata1, long filesize)
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99 {
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100 int cc = *cc1;
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101 unsigned char *filedata = *filedata1;
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102 unsigned char *fp;
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103 fp = &CURBYTE();
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104 while (CURBYTE())
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105 NEXTBYTE();
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106 NEXTBYTE();
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107 *cc1 = cc;
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108 *filedata1 = filedata;
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109 return fp;
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110 }
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111 // the function below can be switched to dealing with data coming from a
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112 // source other than an in-memory byte pool by adjusting the input data
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113 // in "fn" and the above two macros
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114 void read_lwobj16v0(unsigned char *filedata, long filesize)
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115 {
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116 unsigned char *fp;
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117 long cc;
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118 int val;
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119 int bss;
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120
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121 static char *opernames[] = {
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122 "?",
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123 "PLUS",
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124 "MINUS",
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125 "TIMES",
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126 "DIVIDE",
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127 "MOD",
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128 "INTDIV",
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129 "BWAND",
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130 "BWOR",
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131 "BWXOR",
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132 "AND",
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133 "OR",
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134 "NEG",
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135 "COM"
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136 };
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137 static const int numopers = 13;
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138
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139 // start reading *after* the magic number
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140 cc = 8;
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141
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142 while (1)
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143 {
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144 bss = 0;
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145
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146 // bail out if no more sections
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147 if (!(CURBYTE()))
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148 break;
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149
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150 fp = CURSTR();
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151
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152 printf("SECTION %s\n", fp);
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153
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154 // read flags
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155 while (CURBYTE())
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156 {
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157 switch (CURBYTE())
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158 {
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159 case 0x01:
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160 printf(" FLAG: BSS\n");
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161 bss = 1;
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162 break;
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163
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164 default:
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165 printf(" FLAG: %02X (unknown)\n", CURBYTE());
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166 break;
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167 }
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168 NEXTBYTE();
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169 }
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170 // skip NUL terminating flags
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171 NEXTBYTE();
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172
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173 printf(" Local symbols:\n");
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174 // now parse the local symbol table
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175 while (CURBYTE())
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176 {
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177 fp = CURSTR();
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178
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179 // fp is the symbol name
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180 val = (CURBYTE()) << 8;
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181 NEXTBYTE();
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182 val |= (CURBYTE());
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183 NEXTBYTE();
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184 // val is now the symbol value
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185
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186 printf(" %s=%04X\n", fp, val);
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187
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188 }
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189 // skip terminating NUL
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190 NEXTBYTE();
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191
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192 printf(" Exported symbols\n");
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193
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194 // now parse the exported symbol table
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195 while (CURBYTE())
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196 {
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197 fp = CURSTR();
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198
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199 // fp is the symbol name
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200 val = (CURBYTE()) << 8;
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201 NEXTBYTE();
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202 val |= (CURBYTE());
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203 NEXTBYTE();
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204 // val is now the symbol value
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205
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206 printf(" %s=%04X\n", fp, val);
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207 }
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208 // skip terminating NUL
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209 NEXTBYTE();
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210
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211 // now parse the incomplete references and make a list of
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212 // external references that need resolution
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213 printf(" Incomplete references\n");
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214 while (CURBYTE())
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215 {
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216 printf(" (");
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217 // parse the expression
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218 while (CURBYTE())
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219 {
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220 int tt = CURBYTE();
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221 NEXTBYTE();
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222 switch (tt)
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223 {
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224 case 0x01:
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225 // 16 bit integer
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226 tt = CURBYTE() << 8;
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227 NEXTBYTE();
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228 tt |= CURBYTE();
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229 NEXTBYTE();
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230 // normalize for negatives...
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231 if (tt > 0x7fff)
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232 tt -= 0x10000;
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233 printf(" I16=%d", tt);
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234 break;
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235
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236 case 0x02:
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237 // external symbol reference
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238 printf(" ES=%s", CURSTR());
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239 break;
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240
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241 case 0x03:
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242 // internal symbol reference
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243 printf(" IS=%s", CURSTR());
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244 break;
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245
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246 case 0x04:
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247 // operator
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248 if (CURBYTE() > 0 && CURBYTE() <= numopers)
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249 printf(" OP=%s", opernames[CURBYTE()]);
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250 else
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251 printf(" OP=?");
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252 NEXTBYTE();
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253 break;
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254
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255 case 0x05:
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256 // section base reference (NULL internal reference is
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257 // the section base address
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258 printf(" SB");
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259 break;
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260
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261 default:
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262 printf(" ERR");
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263 }
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264 }
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265 // skip the NUL
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266 NEXTBYTE();
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267
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268 // fetch the offset
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269 val = CURBYTE() << 8;
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270 NEXTBYTE();
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271 val |= CURBYTE() & 0xff;
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272 NEXTBYTE();
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273 printf(" ) @ %04X\n", val);
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274 }
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275 // skip the NUL terminating the relocations
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276 NEXTBYTE();
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277
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278 // now set code location and size and verify that the file
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279 // contains data going to the end of the code (if !SECTION_BSS)
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280 val = CURBYTE() << 8;
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281 NEXTBYTE();
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282 val |= CURBYTE();
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283 NEXTBYTE();
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284
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285 printf(" CODE %04X bytes", val);
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286
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287 // skip the code if we're not in a BSS section
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288 if (!bss)
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289 {
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290 int i;
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291 for (i = 0; i < val; i++)
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292 {
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293 if (! (i % 16))
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294 {
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295 printf("\n %04X ", i);
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296 }
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297 printf("%02X", CURBYTE());
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298 NEXTBYTE();
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299 }
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300 }
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301 printf("\n");
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302 }
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303 }
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