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annotate ticoff/tables.c @ 106:a39a38bbec4d

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analysis of what osmocon's voodoo payloads disassemble to in ARM/Thumb
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Mon, 31 Mar 2014 06:33:14 +0000
parents da103b9377e3
children e650fdc743fe
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
71
c15cd3d695c0 tiobjd: successful parsing of the section header table
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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1 /*
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2 * This C module will contain functions for the initial parsing
c15cd3d695c0 tiobjd: successful parsing of the section header table
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3 * of the section and symbol tables.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <string.h>
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10 #include <strings.h>
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11 #include "filestruct.h"
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12 #include "intstruct.h"
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13 #include "globals.h"
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14
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15 extern unsigned get_u16(), get_u32();
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16
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17 static char *
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18 get_secorsym_name(ptr)
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19 u_char *ptr;
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20 {
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21 char *alloc;
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22
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23 if (ptr[0]) {
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24 if (ptr[7]) {
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25 alloc = malloc(9);
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26 if (!alloc) {
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27 perror("malloc");
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28 exit(1);
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29 }
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30 bcopy(ptr, alloc, 8);
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31 alloc[8] = '\0';
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32 return(alloc);
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33 } else
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34 return((char *) ptr);
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35 }
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36 if (ptr[1] || ptr[2] || ptr[3]) {
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37 fprintf(stderr, "error: malformed name in %s at offset 0x%x\n",
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38 objfilename, ptr - filemap);
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39 exit(1);
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40 }
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41 return(filemap + strtab_offset + get_u32(ptr+4));
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42 }
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43
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44 get_int_section_table()
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45 {
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46 unsigned n;
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47
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48 sections = malloc(sizeof(struct internal_scnhdr) * nsections);
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49 if (!sections) {
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50 perror("malloc");
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51 exit(1);
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52 }
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53 for (n = 0; n < nsections; n++) {
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54 sections[n].name = get_secorsym_name(sections_raw[n].s_name);
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55 if (get_u32(sections_raw[n].s_paddr))
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56 fprintf(stderr,
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57 "warning: section #%u (%s) has nonzero paddr\n",
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58 n, sections[n].name);
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59 if (get_u32(sections_raw[n].s_vaddr))
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60 fprintf(stderr,
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61 "warning: section #%u (%s) has nonzero vaddr\n",
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62 n, sections[n].name);
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63 sections[n].size = get_u32(sections_raw[n].s_size);
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64 sections[n].data_offset = get_u32(sections_raw[n].s_scnptr);
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65 sections[n].reloc_offset = get_u32(sections_raw[n].s_relptr);
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66 sections[n].line_offset = get_u32(sections_raw[n].s_lnnoptr);
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67 sections[n].nreloc = get_u32(sections_raw[n].s_nreloc);
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68 sections[n].nlineent = get_u32(sections_raw[n].s_nlnno);
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69 sections[n].flags = get_u32(sections_raw[n].s_flags);
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70 if (get_u16(sections_raw[n].s_reserved))
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71 fprintf(stderr,
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72 "warning: section #%u (%s): some nonzero value in s_reserved bytes\n",
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73 n, sections[n].name);
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74 if (get_u16(sections_raw[n].s_page))
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75 fprintf(stderr,
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76 "warning: section #%u (%s): some nonzero value in s_page bytes\n",
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77 n, sections[n].name);
80
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78 sections[n].nsymbols = 0;
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79 sections[n].sorted_symbols = 0;
71
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80 }
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81 }
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82
73
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83 get_int_symbol_table()
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84 {
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85 unsigned n;
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86 struct internal_syment *in;
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87
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88 symtab = malloc(sizeof(struct internal_syment *) * nsymtab);
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89 if (!symtab) {
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90 perror("malloc");
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91 exit(1);
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92 }
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93 for (n = 0; n < nsymtab; ) {
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94 in = malloc(sizeof(struct internal_syment));
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95 if (!in) {
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96 perror("malloc");
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97 exit(1);
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98 }
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99 symtab[n] = in;
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100 in->name = get_secorsym_name(symtab_raw[n].e_name);
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101 in->value = get_u32(symtab_raw[n].e_value);
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102 in->scnum = get_s16(symtab_raw[n].e_scnum);
80
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103 if (in->scnum > 0) {
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104 if (in->scnum > nsections) {
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105 fprintf(stderr,
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106 "symtab entry #%u: scnum too big\n", n);
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107 exit(1);
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108 }
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109 in->section = sections + in->scnum - 1;
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110 in->section->nsymbols++;
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111 } else if (in->scnum < -2) {
73
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112 fprintf(stderr,
80
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113 "symtab entry #%u: scnum < -2\n", n);
73
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114 exit(1);
80
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115 } else
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116 in->section = 0;
73
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117 in->type = get_u16(symtab_raw[n].e_type);
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118 in->class = symtab_raw[n].e_sclass;
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119 switch (symtab_raw[n++].e_numaux) {
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120 case 0:
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121 in->aux = 0;
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122 continue;
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123 case 1:
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124 if (n >= nsymtab) {
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125 fprintf(stderr,
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126 "error: last symbol's aux spills over\n");
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127 exit(1);
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128 }
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129 symtab[n] = 0;
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130 in->aux = (u_char *)(symtab_raw + n);
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131 n++;
10f3fbff5e97 tiobjd: symbol table parsing implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 71
diff changeset
132 continue;
10f3fbff5e97 tiobjd: symbol table parsing implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 71
diff changeset
133 default:
10f3fbff5e97 tiobjd: symbol table parsing implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 71
diff changeset
134 n--;
10f3fbff5e97 tiobjd: symbol table parsing implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 71
diff changeset
135 fprintf(stderr, "symtab entry #%u: invalid numaux\n",
10f3fbff5e97 tiobjd: symbol table parsing implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 71
diff changeset
136 n);
10f3fbff5e97 tiobjd: symbol table parsing implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 71
diff changeset
137 exit(1);
10f3fbff5e97 tiobjd: symbol table parsing implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 71
diff changeset
138 }
10f3fbff5e97 tiobjd: symbol table parsing implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 71
diff changeset
139 }
10f3fbff5e97 tiobjd: symbol table parsing implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 71
diff changeset
140 }