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annotate ticoff/disasm.c @ 111:0f94d17899b3

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tiobjd: disassembly integrated, no relocs or hints yet
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Thu, 03 Apr 2014 05:14:15 +0000
parents
children 61a58677dc68
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
111
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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1 /*
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2 * Putting it all together: section-, symbol- and reloc-aware disassembly
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3 */
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4
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5 #include <sys/types.h>
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6 #include <stdio.h>
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7 #include <stdlib.h>
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8 #include <string.h>
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9 #include <strings.h>
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10 #include "intstruct.h"
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11 #include "coffconst.h"
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12 #include "globals.h"
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13
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14 extern unsigned get_u16(), get_u32();
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15
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16 void
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17 disasm_text_section(sec)
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18 struct internal_scnhdr *sec;
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19 {
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20 unsigned symnum, relnum;
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21 unsigned pos, incr, headroom;
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22 int state = -1, linebrk = 0;
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23 struct internal_syment *sym;
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24 struct internal_reloc *rel;
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25 char *sym_comment;
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26
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27 printf("Disassembling code section:\n");
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28 if (sec->nsymbols)
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29 sort_symbols_of_sec(sec);
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30 if (sec->nreloc)
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31 get_relocs_of_sec(sec);
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32 symnum = relnum = 0;
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33 for (pos = 0; pos < sec->size; pos += incr) {
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34 headroom = sec->size - pos;
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35 while (symnum < sec->nsymbols) {
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36 sym = sec->sorted_symbols[symnum];
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37 if (sym->value > pos) {
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38 if (sym->value - pos < headroom)
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39 headroom = sym->value - pos;
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40 break;
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41 }
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42 /* hit symbol */
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43 if (!linebrk) {
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44 putchar('\n');
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45 linebrk = 1;
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46 }
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47 switch (sym->class) {
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48 case C_EXT:
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49 sym_comment = "Global";
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50 break;
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51 case C_STAT:
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52 sym_comment = "static";
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53 break;
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54 case C_LABEL:
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55 sym_comment = "label";
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56 if (!strcmp(sym->name, "$CODE16"))
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57 state = 1;
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58 else if (!strcmp(sym->name, "$CODE32"))
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59 state = 0;
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60 break;
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61 default:
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62 sym_comment = "unexpected class!";
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63 }
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64 printf("%s:\t; %s\n", sym->name, sym_comment);
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65 symnum++;
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66 }
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67 if (relnum < sec->nreloc) {
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68 rel = sec->int_relocs + relnum;
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69 if (rel->location == pos)
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70 relnum++; /* it's ours */
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71 else {
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72 if (rel->location - pos < headroom)
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73 headroom = rel->location - pos;
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74 rel = 0; /* no reloc for current pos */
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75 }
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76 } else
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77 rel = 0;
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78 printf("%8x:\t", pos);
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79 switch (state) {
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80 case 0: /* ARM */
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81 if (pos & 3) {
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82 printf("MISALIGNED pos in CODE32 state, aborting\n");
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83 return;
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84 }
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85 /* reloc handling to be added */
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86 arm_disasm_line(sec, pos);
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87 incr = 4;
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88 break;
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89 case 1: /* Thumb */
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90 if (pos & 1) {
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91 printf("MISALIGNED pos in CODE16 state, aborting\n");
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92 return;
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93 }
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94 /* reloc handling to be added */
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95 if (headroom >= 4 && thumb_check_bl(sec, pos))
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96 incr = 4;
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97 else {
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98 thumb_disasm_line(sec, pos);
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99 incr = 2;
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100 }
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101 break;
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102 default:
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103 printf("UNKNOWN T state, aborting\n");
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104 return;
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105 }
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106 linebrk = 0;
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107 if (incr > headroom) {
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108 printf("error: increment %u > headroom %u, aborting\n",
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109 incr, headroom);
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110 return;
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111 }
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112 }
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113 }
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114
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115 void
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116 disasm_sectype_by_name(sec)
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117 struct internal_scnhdr *sec;
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118 {
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119 if (!strncmp(sec->name, ".text", 5))
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120 disasm_text_section(sec);
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121 /* other section types to be added */
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122 else
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123 printf("Unrecognized section type, skipped\n");
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124 }
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125
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126 cmd_disasm()
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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127 {
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128 struct internal_scnhdr *sec;
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129 unsigned secnum;
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130
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131 printf("%s:\n", objfilename);
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132 dump_filehdr_info();
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133 putchar('\n');
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134 get_int_section_table();
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135 get_int_symbol_table();
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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136 extern_profile_report("Module");
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137 for (secnum = 0; secnum < nsections; secnum++) {
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138 sec = sections + secnum;
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139 printf("=== %s ===\n", sec->name);
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140 disasm_sectype_by_name(sec);
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141 putchar('\n');
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142 }
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143 exit(0);
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144 }