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339
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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 #include <config.h>
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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 char *program_name;
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36
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37 /*
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38 The logic of reading the entire file into memory is simple. All the symbol
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39 names in the file are NUL terminated strings and can be used directly without
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40 making additional copies.
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41 */
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42 int main(int argc, char **argv)
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43 {
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44 int i;
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45 long size;
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46 FILE *f;
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47 long bread;
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48 unsigned char *filedata;
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49
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50 program_name = argv[0];
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51 if (argc != 2)
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52 {
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53 fprintf(stderr, "Must specify exactly one input file.\n");
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54 exit(1);
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55 }
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56
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57 f = fopen(argv[1], "rb");
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58 if (!f)
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59 {
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60 fprintf(stderr, "Can't open file %s:", argv[1]);
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61 perror("");
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62 exit(1);
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63 }
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64 fseek(f, 0, SEEK_END);
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65 size = ftell(f);
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66 rewind(f);
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67
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68 filedata = lw_malloc(size);
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69
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70 bread = fread(filedata, 1, size, f);
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71 if (bread < size)
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72 {
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73 fprintf(stderr, "Short read on file %s (%ld/%ld):", argv[1], bread, size);
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74 perror("");
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75 exit(1);
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76 }
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77
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78 fclose(f);
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79
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80 if (!memcmp(filedata, "LWOBJ16", 8))
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81 {
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82 // read v0 LWOBJ16 file
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83 read_lwobj16v0(filedata, size);
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84 }
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85 else
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86 {
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87 fprintf(stderr, "%s: unknown file format\n", argv[1]);
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88 exit(1);
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89 }
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90 exit(0);
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91 }
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92
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93 // this macro is used to bail out if we run off the end of the file data
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94 // while parsing - it keeps the code below cleaner
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95 #define NEXTBYTE() do { cc++; if (cc > filesize) { fprintf(stderr, "***invalid file format\n"); exit(1); } } while (0)
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96 // this macro is used to refer to the current byte in the stream
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97 #define CURBYTE() (filedata[cc < filesize ? cc : filesize - 1])
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98 // this one will leave the input pointer past the trailing NUL
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99 #define CURSTR() read_lwobj16v0_str(&cc, &filedata, filesize)
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100 unsigned char *read_lwobj16v0_str(long *cc1, unsigned char **filedata1, long filesize)
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101 {
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102 int cc = *cc1;
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103 unsigned char *filedata = *filedata1;
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104 unsigned char *fp;
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105 fp = &CURBYTE();
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106 while (CURBYTE())
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107 NEXTBYTE();
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108 NEXTBYTE();
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109 *cc1 = cc;
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110 *filedata1 = filedata;
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111 return fp;
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112 }
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113 // the function below can be switched to dealing with data coming from a
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114 // source other than an in-memory byte pool by adjusting the input data
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115 // in "fn" and the above two macros
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116 void read_lwobj16v0(unsigned char *filedata, long filesize)
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117 {
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118 unsigned char *fp;
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119 long cc;
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120 int val;
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121 int bss;
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122
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123 static char *opernames[] = {
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124 "?",
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125 "PLUS",
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126 "MINUS",
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127 "TIMES",
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128 "DIVIDE",
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129 "MOD",
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130 "INTDIV",
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131 "BWAND",
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132 "BWOR",
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133 "BWXOR",
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134 "AND",
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135 "OR",
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136 "NEG",
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137 "COM"
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138 };
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139 static const int numopers = 13;
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140
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141 // start reading *after* the magic number
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142 cc = 8;
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143
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144 while (1)
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145 {
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146 bss = 0;
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147
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148 // bail out if no more sections
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149 if (!(CURBYTE()))
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150 break;
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151
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152 fp = CURSTR();
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153
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154 printf("SECTION %s\n", fp);
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155
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156 // read flags
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157 while (CURBYTE())
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158 {
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159 switch (CURBYTE())
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160 {
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161 case 0x01:
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162 printf(" FLAG: BSS\n");
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163 bss = 1;
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164 break;
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165
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166 default:
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167 printf(" FLAG: %02X (unknown)\n", CURBYTE());
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168 break;
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169 }
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170 NEXTBYTE();
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171 }
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172 // skip NUL terminating flags
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173 NEXTBYTE();
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174
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175 printf(" Local symbols:\n");
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176 // now parse the local symbol table
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177 while (CURBYTE())
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178 {
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179 fp = CURSTR();
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180
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181 // fp is the symbol name
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182 val = (CURBYTE()) << 8;
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183 NEXTBYTE();
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184 val |= (CURBYTE());
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185 NEXTBYTE();
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186 // val is now the symbol value
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187
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188 printf(" %s=%04X\n", fp, val);
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189
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190 }
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191 // skip terminating NUL
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192 NEXTBYTE();
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193
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194 printf(" Exported symbols\n");
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195
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196 // now parse the exported symbol table
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197 while (CURBYTE())
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198 {
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199 fp = CURSTR();
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200
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201 // fp is the symbol name
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202 val = (CURBYTE()) << 8;
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203 NEXTBYTE();
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204 val |= (CURBYTE());
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205 NEXTBYTE();
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206 // val is now the symbol value
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207
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208 printf(" %s=%04X\n", fp, val);
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209 }
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210 // skip terminating NUL
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211 NEXTBYTE();
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212
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213 // now parse the incomplete references and make a list of
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214 // external references that need resolution
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215 printf(" Incomplete references\n");
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216 while (CURBYTE())
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217 {
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218 printf(" (");
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219 // parse the expression
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220 while (CURBYTE())
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221 {
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222 int tt = CURBYTE();
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223 NEXTBYTE();
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224 switch (tt)
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225 {
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226 case 0x01:
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227 // 16 bit integer
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228 tt = CURBYTE() << 8;
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229 NEXTBYTE();
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230 tt |= CURBYTE();
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231 NEXTBYTE();
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232 // normalize for negatives...
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233 if (tt > 0x7fff)
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234 tt -= 0x10000;
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235 printf(" I16=%d", tt);
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236 break;
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237
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238 case 0x02:
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239 // external symbol reference
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240 printf(" ES=%s", CURSTR());
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241 break;
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242
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243 case 0x03:
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244 // internal symbol reference
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245 printf(" IS=%s", CURSTR());
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246 break;
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247
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248 case 0x04:
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249 // operator
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250 if (CURBYTE() > 0 && CURBYTE() <= numopers)
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251 printf(" OP=%s", opernames[CURBYTE()]);
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252 else
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253 printf(" OP=?");
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254 NEXTBYTE();
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255 break;
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256
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257 case 0x05:
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258 // section base reference (NULL internal reference is
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259 // the section base address
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260 printf(" SB");
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261 break;
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262
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263 case 0xFF:
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264 // section flags
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265 printf(" FLAGS=%02X", CURBYTE());
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266 NEXTBYTE();
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267 break;
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268
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269 default:
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270 printf(" ERR");
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271 }
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272 }
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273 // skip the NUL
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274 NEXTBYTE();
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275
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276 // fetch the offset
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277 val = CURBYTE() << 8;
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278 NEXTBYTE();
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279 val |= CURBYTE() & 0xff;
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280 NEXTBYTE();
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281 printf(" ) @ %04X\n", val);
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282 }
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283 // skip the NUL terminating the relocations
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284 NEXTBYTE();
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285
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286 // now set code location and size and verify that the file
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287 // contains data going to the end of the code (if !SECTION_BSS)
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288 val = CURBYTE() << 8;
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289 NEXTBYTE();
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290 val |= CURBYTE();
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291 NEXTBYTE();
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292
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293 printf(" CODE %04X bytes", val);
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294
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295 // skip the code if we're not in a BSS section
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296 if (!bss)
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297 {
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298 int i;
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299 for (i = 0; i < val; i++)
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300 {
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301 if (! (i % 16))
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302 {
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303 printf("\n %04X ", i);
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304 }
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305 printf("%02X", CURBYTE());
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306 NEXTBYTE();
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307 }
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308 }
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309 printf("\n");
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310 }
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311 }
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