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annotate ticoff/disasm.c @ 114:ca8e43288836

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tiobjd: ARM_B reloc handling
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Thu, 03 Apr 2014 06:42:39 +0000
parents 61a58677dc68
children f9fde7f36ae3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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
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16 void
112
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17 disasm_reloc_target(sec, rel, addend)
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18 struct internal_scnhdr *sec;
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19 struct internal_reloc *rel;
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20 unsigned addend;
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21 {
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22 struct internal_syment *sym = rel->sym;
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23
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24 addend -= sym->value;
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25 if (addend >= 10)
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26 printf("%s+0x%x", sym->name, addend);
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27 else if (addend)
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28 printf("%s+%u", sym->name, addend);
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29 else
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30 fputs(sym->name, stdout);
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31 }
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32
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33 void
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34 disasm_word32_reloc(sec, rel)
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35 struct internal_scnhdr *sec;
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36 struct internal_reloc *rel;
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37 {
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38 unsigned word;
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39
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40 word = get_u32(filemap + sec->data_offset + rel->location);
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41 printf("%08x R\t.word\t", word);
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42 disasm_reloc_target(sec, rel, word);
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43 putchar('\n');
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44 }
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45
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46 void
111
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47 disasm_text_section(sec)
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48 struct internal_scnhdr *sec;
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49 {
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50 unsigned symnum, relnum;
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51 unsigned pos, incr, headroom;
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52 int state = -1, linebrk = 0;
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53 struct internal_syment *sym;
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54 struct internal_reloc *rel;
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55 char *sym_comment;
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56
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57 printf("Disassembling code section:\n");
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58 if (sec->nsymbols)
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59 sort_symbols_of_sec(sec);
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60 if (sec->nreloc)
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61 get_relocs_of_sec(sec);
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62 symnum = relnum = 0;
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63 for (pos = 0; pos < sec->size; pos += incr) {
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64 headroom = sec->size - pos;
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65 while (symnum < sec->nsymbols) {
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66 sym = sec->sorted_symbols[symnum];
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67 if (sym->value > pos) {
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68 if (sym->value - pos < headroom)
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69 headroom = sym->value - pos;
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70 break;
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71 }
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72 /* hit symbol */
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73 if (!linebrk) {
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74 putchar('\n');
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75 linebrk = 1;
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76 }
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77 switch (sym->class) {
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78 case C_EXT:
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79 sym_comment = "Global";
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80 break;
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81 case C_STAT:
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82 sym_comment = "static";
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83 break;
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84 case C_LABEL:
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85 sym_comment = "label";
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86 if (!strcmp(sym->name, "$CODE16"))
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87 state = 1;
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88 else if (!strcmp(sym->name, "$CODE32"))
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89 state = 0;
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90 break;
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91 default:
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92 sym_comment = "unexpected class!";
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93 }
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94 printf("%s:\t; %s\n", sym->name, sym_comment);
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95 symnum++;
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96 }
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97 if (relnum < sec->nreloc) {
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98 rel = sec->int_relocs + relnum;
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99 if (rel->location == pos)
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100 relnum++; /* it's ours */
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101 else {
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102 if (rel->location - pos < headroom)
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103 headroom = rel->location - pos;
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104 rel = 0; /* no reloc for current pos */
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105 }
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106 } else
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107 rel = 0;
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108 printf("%8x:\t", pos);
112
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109 if (rel && rel->type == RTYPE_LONG) {
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110 if (pos & 3) {
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111 printf("MISALIGNED pos for word32 reloc, aborting\n");
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112 return;
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113 }
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114 disasm_word32_reloc(sec, rel);
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115 incr = 4;
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116 goto next;
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117 }
111
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118 switch (state) {
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119 case 0: /* ARM */
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120 if (pos & 3) {
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121 printf("MISALIGNED pos in CODE32 state, aborting\n");
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122 return;
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123 }
114
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124 if (rel) {
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125 if (rel->type != RTYPE_ARM_B) {
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126 printf("Wrong reloc type in CODE32 state, aborting\n");
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127 return;
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128 }
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129 arm_branch_reloc(sec, rel);
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130 } else
ca8e43288836 tiobjd: ARM_B reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 112
diff changeset
131 arm_disasm_line(sec, pos);
111
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
132 incr = 4;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
133 break;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
134 case 1: /* Thumb */
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
135 if (pos & 1) {
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
136 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
137 return;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
138 }
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
139 /* reloc handling to be added */
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
140 if (headroom >= 4 && thumb_check_bl(sec, pos))
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
141 incr = 4;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
142 else {
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
143 thumb_disasm_line(sec, pos);
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
144 incr = 2;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
145 }
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
146 break;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
147 default:
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
148 printf("UNKNOWN T state, aborting\n");
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
149 return;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
150 }
112
61a58677dc68 tiobjd disasm: beginning of reloc handling
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 111
diff changeset
151 next: linebrk = 0;
111
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
152 if (incr > headroom) {
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
153 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
154 incr, headroom);
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
155 return;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
156 }
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
157 }
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
158 }
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
159
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
160 void
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
161 disasm_sectype_by_name(sec)
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
162 struct internal_scnhdr *sec;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
163 {
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
164 if (!strncmp(sec->name, ".text", 5))
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
165 disasm_text_section(sec);
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
166 /* other section types to be added */
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
167 else
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
168 printf("Unrecognized section type, skipped\n");
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
169 }
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
170
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
171 cmd_disasm()
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
172 {
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
173 struct internal_scnhdr *sec;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
174 unsigned secnum;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
175
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
176 printf("%s:\n", objfilename);
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
177 dump_filehdr_info();
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
178 putchar('\n');
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
179 get_int_section_table();
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
180 get_int_symbol_table();
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
181 extern_profile_report("Module");
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
182 for (secnum = 0; secnum < nsections; secnum++) {
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
183 sec = sections + secnum;
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
184 printf("=== %s ===\n", sec->name);
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
185 disasm_sectype_by_name(sec);
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
186 putchar('\n');
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
187 }
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
188 exit(0);
0f94d17899b3 tiobjd: disassembly integrated, no relocs or hints yet
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
189 }