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annotate ticoff/disasm.c @ 121:d88f2f40e3ae

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tiobjd: handling of symbol-less relocs
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Fri, 04 Apr 2014 07:19:15 +0000
parents 4d8dfdbd2ea1
children 5f9cc99930a8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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111
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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
118
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16 static void
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17 find_better_symbol(sec, symp, addp)
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18 struct internal_scnhdr *sec;
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19 struct internal_syment **symp;
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20 unsigned *addp;
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21 {
120
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22 unsigned addr, delta;
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23 struct internal_syment *sym;
118
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24 unsigned n;
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25
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26 addr = *addp;
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27 for (n = 0; n < sec->nsymbols; n++) {
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28 sym = sec->sorted_symbols[n];
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29 if (sym->value > addr)
120
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30 return;
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31 if (sym->class != C_EXT && sym->class != C_STAT)
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32 continue;
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33 delta = addr - sym->value;
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34 if (sym->name[0] == '_' && !delta ||
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35 sym->name[0] == '$' && delta <= 1) {
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36 *symp = sym;
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37 *addp = delta;
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38 }
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39 }
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40 }
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41
111
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42 void
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43 disasm_reloc_target(sec, rel, addend)
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44 struct internal_scnhdr *sec;
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45 struct internal_reloc *rel;
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46 unsigned addend;
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47 {
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48 struct internal_syment *sym = rel->sym;
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49
121
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50 if (sym)
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51 addend -= sym->value;
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52 if (!sym || sym->section && !strcmp(sym->name, sym->section->name))
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53 find_better_symbol(sym ? sym->section : sec, &sym, &addend);
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54 if (sym)
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55 fputs(sym->name, stdout);
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56 else
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57 fputs(sec->name, stdout);
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58 if (addend >= 10)
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59 printf("+0x%x", addend);
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60 else if (addend)
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61 printf("+%u", addend);
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62 }
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63
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64 void
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65 disasm_word32_reloc(sec, rel)
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66 struct internal_scnhdr *sec;
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67 struct internal_reloc *rel;
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68 {
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69 unsigned word;
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70
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71 word = get_u32(filemap + sec->data_offset + rel->location);
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72 printf("%08x R\t.word\t", word);
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73 disasm_reloc_target(sec, rel, word);
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74 putchar('\n');
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75 }
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76
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77 void
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78 disasm_text_section(sec)
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79 struct internal_scnhdr *sec;
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80 {
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81 unsigned symnum, relnum;
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82 unsigned pos, incr, headroom;
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83 int state = -1, linebrk = 0;
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84 struct internal_syment *sym;
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85 struct internal_reloc *rel;
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86 char *sym_comment;
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87
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88 printf("Disassembling code section:\n");
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89 if (sec->nsymbols)
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90 sort_symbols_of_sec(sec);
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91 if (sec->nreloc)
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92 get_relocs_of_sec(sec);
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93 symnum = relnum = 0;
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94 for (pos = 0; pos < sec->size; pos += incr) {
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95 headroom = sec->size - pos;
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96 while (symnum < sec->nsymbols) {
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97 sym = sec->sorted_symbols[symnum];
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98 if (sym->value > pos) {
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99 if (sym->value - pos < headroom)
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100 headroom = sym->value - pos;
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101 break;
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102 }
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103 /* hit symbol */
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104 if (!linebrk) {
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105 putchar('\n');
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106 linebrk = 1;
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107 }
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108 switch (sym->class) {
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109 case C_EXT:
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110 sym_comment = "Global";
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111 break;
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112 case C_STAT:
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113 sym_comment = "static";
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114 break;
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115 case C_LABEL:
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116 sym_comment = "label";
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117 if (!strcmp(sym->name, "$CODE16"))
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118 state = 1;
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119 else if (!strcmp(sym->name, "$CODE32"))
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120 state = 0;
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121 break;
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122 default:
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123 sym_comment = "unexpected class!";
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124 }
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125 printf("%s:\t; %s\n", sym->name, sym_comment);
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126 symnum++;
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127 }
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128 if (relnum < sec->nreloc) {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
129 rel = sec->int_relocs + relnum;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
130 if (rel->location == pos)
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
131 relnum++; /* it's ours */
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
132 else {
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
133 if (rel->location - pos < headroom)
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
134 headroom = rel->location - pos;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
135 rel = 0; /* no reloc for current pos */
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
136 }
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
137 } else
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
138 rel = 0;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
139 printf("%8x:\t", pos);
112
61a58677dc68 tiobjd disasm: beginning of reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 111
diff changeset
140 if (rel && rel->type == RTYPE_LONG) {
61a58677dc68 tiobjd disasm: beginning of reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 111
diff changeset
141 if (pos & 3) {
61a58677dc68 tiobjd disasm: beginning of reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 111
diff changeset
142 printf("MISALIGNED pos for word32 reloc, aborting\n");
61a58677dc68 tiobjd disasm: beginning of reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 111
diff changeset
143 return;
61a58677dc68 tiobjd disasm: beginning of reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 111
diff changeset
144 }
61a58677dc68 tiobjd disasm: beginning of reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 111
diff changeset
145 disasm_word32_reloc(sec, rel);
61a58677dc68 tiobjd disasm: beginning of reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 111
diff changeset
146 incr = 4;
61a58677dc68 tiobjd disasm: beginning of reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 111
diff changeset
147 goto next;
61a58677dc68 tiobjd disasm: beginning of reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 111
diff changeset
148 }
111
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
149 switch (state) {
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
150 case 0: /* ARM */
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
151 if (pos & 3) {
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
152 printf("MISALIGNED pos in CODE32 state, aborting\n");
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
153 return;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
154 }
114
ca8e43288836 tiobjd: ARM_B reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 112
diff changeset
155 if (rel) {
ca8e43288836 tiobjd: ARM_B reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 112
diff changeset
156 if (rel->type != RTYPE_ARM_B) {
ca8e43288836 tiobjd: ARM_B reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 112
diff changeset
157 printf("Wrong reloc type in CODE32 state, aborting\n");
ca8e43288836 tiobjd: ARM_B reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 112
diff changeset
158 return;
ca8e43288836 tiobjd: ARM_B reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 112
diff changeset
159 }
ca8e43288836 tiobjd: ARM_B reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 112
diff changeset
160 arm_branch_reloc(sec, rel);
ca8e43288836 tiobjd: ARM_B reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 112
diff changeset
161 } else
ca8e43288836 tiobjd: ARM_B reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 112
diff changeset
162 arm_disasm_line(sec, pos);
111
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
163 incr = 4;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
164 break;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
165 case 1: /* Thumb */
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
166 if (pos & 1) {
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
167 printf("MISALIGNED pos in CODE16 state, aborting\n");
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
168 return;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
169 }
117
f9fde7f36ae3 tiobjd: Thumb_BL reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 114
diff changeset
170 if (rel) {
f9fde7f36ae3 tiobjd: Thumb_BL reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 114
diff changeset
171 if (rel->type != RTYPE_THUMB_BL) {
f9fde7f36ae3 tiobjd: Thumb_BL reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 114
diff changeset
172 printf("Wrong reloc type in CODE16 state, aborting\n");
f9fde7f36ae3 tiobjd: Thumb_BL reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 114
diff changeset
173 return;
f9fde7f36ae3 tiobjd: Thumb_BL reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 114
diff changeset
174 }
f9fde7f36ae3 tiobjd: Thumb_BL reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 114
diff changeset
175 thumb_bl_reloc(sec, rel);
f9fde7f36ae3 tiobjd: Thumb_BL reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 114
diff changeset
176 incr = 4;
f9fde7f36ae3 tiobjd: Thumb_BL reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 114
diff changeset
177 } else if (headroom >= 4 && thumb_check_bl(sec, pos))
111
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
178 incr = 4;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
179 else {
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
180 thumb_disasm_line(sec, pos);
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
181 incr = 2;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
182 }
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
183 break;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
184 default:
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
185 printf("UNKNOWN T state, aborting\n");
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
186 return;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
187 }
112
61a58677dc68 tiobjd disasm: beginning of reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 111
diff changeset
188 next: linebrk = 0;
111
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
189 if (incr > headroom) {
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
190 printf("error: increment %u > headroom %u, aborting\n",
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
191 incr, headroom);
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
192 return;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
193 }
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
194 }
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
195 }
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
196
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
197 void
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
198 disasm_sectype_by_name(sec)
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
199 struct internal_scnhdr *sec;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
200 {
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
201 if (!strncmp(sec->name, ".text", 5))
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
202 disasm_text_section(sec);
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
203 /* other section types to be added */
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
204 else
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
205 printf("Unrecognized section type, skipped\n");
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
206 }
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
207
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
208 cmd_disasm()
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
209 {
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
210 struct internal_scnhdr *sec;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
211 unsigned secnum;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
212
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
213 printf("%s:\n", objfilename);
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
214 dump_filehdr_info();
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
215 putchar('\n');
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
216 get_int_section_table();
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
217 get_int_symbol_table();
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
218 extern_profile_report("Module");
118
193926ccd1ec tiobjd: better handling of section-relative relocs
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 117
diff changeset
219 sort_symbols_of_all_sec();
111
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
220 for (secnum = 0; secnum < nsections; secnum++) {
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
221 sec = sections + secnum;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
222 printf("=== %s ===\n", sec->name);
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
223 disasm_sectype_by_name(sec);
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
224 putchar('\n');
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
225 }
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
226 exit(0);
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
227 }