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annotate objgrep/mkpattern.c @ 173:77cd647375e5

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objgrep -r: dump symbols in other sections recovered through relocs
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Fri, 04 Jul 2014 06:34:33 +0000
parents ed1a06bf525d
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
167
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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1 /*
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2 * objgrep: preparation of matching pattern
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3 */
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4
c25367bb7656 objgrep: written, compiles
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5 #include <sys/types.h>
c25367bb7656 objgrep: written, compiles
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6 #include <stdio.h>
c25367bb7656 objgrep: written, compiles
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7 #include <stdint.h>
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8 #include <stdlib.h>
c25367bb7656 objgrep: written, compiles
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9 #include <string.h>
c25367bb7656 objgrep: written, compiles
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10 #include <strings.h>
c25367bb7656 objgrep: written, compiles
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11 #include "filestruct.h"
c25367bb7656 objgrep: written, compiles
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12 #include "intstruct.h"
c25367bb7656 objgrep: written, compiles
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13 #include "coffconst.h"
c25367bb7656 objgrep: written, compiles
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14 #include "globals.h"
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15
c25367bb7656 objgrep: written, compiles
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16 extern unsigned get_u16(), get_u32();
c25367bb7656 objgrep: written, compiles
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17
c25367bb7656 objgrep: written, compiles
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18 static unsigned
c25367bb7656 objgrep: written, compiles
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19 arm_branch_reloc(origbits, location)
c25367bb7656 objgrep: written, compiles
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20 u_char *origbits;
c25367bb7656 objgrep: written, compiles
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21 unsigned location;
c25367bb7656 objgrep: written, compiles
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22 {
c25367bb7656 objgrep: written, compiles
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23 unsigned word, dest;
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24
c25367bb7656 objgrep: written, compiles
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25 word = get_u32(origbits + location);
c25367bb7656 objgrep: written, compiles
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26 if ((word & 0x0E000000) != 0x0A000000) {
c25367bb7656 objgrep: written, compiles
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27 fprintf(stderr,
c25367bb7656 objgrep: written, compiles
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28 "error: invalid ARM_B reloc: opcode not B or BL\n");
c25367bb7656 objgrep: written, compiles
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29 exit(2);
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30 }
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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31 dest = (word & 0x00FFFFFF) << 2;
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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32 if (dest & 0x02000000)
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33 dest |= 0xFC000000;
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34 dest += location + 8;
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35 return(dest);
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36 }
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37
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38 static unsigned
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39 thumb_bl_reloc(origbits, location)
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40 u_char *origbits;
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41 unsigned location;
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42 {
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43 unsigned ins1, ins2;
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44 unsigned dest;
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45
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46 ins1 = get_u16(origbits + location);
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47 ins2 = get_u16(origbits + location + 2);
c25367bb7656 objgrep: written, compiles
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48 if ((ins1 & 0xF800) != 0xF000 || (ins2 & 0xF800) != 0xF800) {
c25367bb7656 objgrep: written, compiles
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49 fprintf(stderr,
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50 "error: invalid Thumb_BL reloc: opcode not BL\n");
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51 exit(2);
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52 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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53 dest = ((ins1 & 0x7FF) << 12) | ((ins2 & 0x7FF) << 1);
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54 if (dest & 0x00400000)
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55 dest |= 0xFF800000;
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56 dest += location + 4;
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57 return(dest);
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58 }
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59
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60 prepare_pattern()
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61 {
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62 u_char *origbits;
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63 unsigned pad, n;
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64 struct internal_reloc *irel;
c25367bb7656 objgrep: written, compiles
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65 struct external_reloc *xrel;
c25367bb7656 objgrep: written, compiles
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66 unsigned lastloc, symidx;
c25367bb7656 objgrep: written, compiles
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67 struct internal_syment *sym;
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68
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69 origbits = objfilemap + grep_section->data_offset;
c25367bb7656 objgrep: written, compiles
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70 pattern_len = (grep_section->size + 3) & ~3;
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71 pattern_match = malloc(pattern_len);
c25367bb7656 objgrep: written, compiles
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72 if (!pattern_match) {
c25367bb7656 objgrep: written, compiles
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73 perror("malloc");
c25367bb7656 objgrep: written, compiles
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74 exit(2);
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75 }
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76 bcopy(origbits, pattern_match, grep_section->size);
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77 pattern_mask = malloc(pattern_len);
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78 if (!pattern_mask) {
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79 perror("malloc");
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80 exit(2);
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81 }
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82 memset(pattern_mask, 0xFF, grep_section->size);
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83 pad = pattern_len - grep_section->size;
c25367bb7656 objgrep: written, compiles
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84 if (pad) {
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85 bzero(pattern_match + grep_section->size, pad);
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86 bzero(pattern_mask + grep_section->size, pad);
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87 }
c25367bb7656 objgrep: written, compiles
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88 if (!grep_section->nreloc)
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89 return(0);
c25367bb7656 objgrep: written, compiles
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90 xrel = (struct external_reloc *)
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91 (objfilemap + grep_section->reloc_offset);
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92 irel = malloc(sizeof(struct internal_reloc) * grep_section->nreloc);
c25367bb7656 objgrep: written, compiles
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93 if (!irel) {
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94 perror("malloc");
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95 exit(2);
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96 }
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97 relocs = irel;
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98 for (n = 0; n < grep_section->nreloc; n++, xrel++, irel++) {
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99 irel->location = get_u32(xrel->r_vaddr);
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100 if (n && irel->location < lastloc) {
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101 fprintf(stderr, "error: non-increasing reloc order\n");
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102 exit(2);
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103 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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104 lastloc = irel->location + 4;
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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105 if (lastloc > grep_section->size) {
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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106 fprintf(stderr,
c25367bb7656 objgrep: written, compiles
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107 "error: reloc spills past the end of the section\n");
c25367bb7656 objgrep: written, compiles
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108 exit(2);
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109 }
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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110 symidx = get_u32(xrel->r_symndx);
c25367bb7656 objgrep: written, compiles
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111 if (symidx == 0xFFFFFFFF)
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112 sym = 0;
c25367bb7656 objgrep: written, compiles
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113 else if (symidx >= nsymtab || !symtab[symidx]) {
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114 fprintf(stderr,
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115 "error: reloc references invalid symbol #%u\n",
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116 symidx);
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117 exit(2);
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118 } else
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119 sym = symtab[symidx];
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120 if (sym && sym->value) {
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121 fprintf(stderr,
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122 "error: symbol #%u referenced by reloc has nonzero value\n");
c25367bb7656 objgrep: written, compiles
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123 exit(2);
c25367bb7656 objgrep: written, compiles
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124 }
c25367bb7656 objgrep: written, compiles
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125 if (!sym) {
c25367bb7656 objgrep: written, compiles
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126 irel->secbase = grep_section;
c25367bb7656 objgrep: written, compiles
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127 irel->extsym = 0;
173
77cd647375e5 objgrep -r: dump symbols in other sections recovered through relocs
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parents: 168
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128 nreloc_int++;
168
ed1a06bf525d objgrep: works after fixing a buglet
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parents: 167
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129 } else if (sym->class == C_EXT && sym->scnum == 0) {
167
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130 irel->extsym = sym;
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131 irel->secbase = 0;
173
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132 nreloc_ext++;
167
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133 } else if (sym->class == C_STAT && sym->section &&
c25367bb7656 objgrep: written, compiles
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134 !strcmp(sym->name, sym->section->name)) {
c25367bb7656 objgrep: written, compiles
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135 irel->secbase = sym->section;
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136 irel->extsym = 0;
173
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137 nreloc_int++;
167
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138 } else {
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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139 fprintf(stderr, "error: unable to grok reloc\n");
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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140 exit(2);
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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141 }
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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142 irel->type = get_u16(xrel->r_type);
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
143 switch (irel->type) {
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
144 case RTYPE_LONG:
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
145 if (irel->location & 3) {
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
146 align_error: fprintf(stderr, "error: misaligned reloc\n");
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
147 exit(2);
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
148 }
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
149 irel->addend = get_u32(origbits + irel->location);
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
150 *(uint32_t *)(pattern_match + irel->location) = 0;
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
151 *(uint32_t *)(pattern_mask + irel->location) = 0;
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
152 break;
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
153 case RTYPE_ARM_B:
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
154 if (irel->location & 3)
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
155 goto align_error;
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
156 irel->addend = arm_branch_reloc(origbits,
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
157 irel->location);
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
158 bzero(pattern_match + irel->location, 3);
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
159 bzero(pattern_mask + irel->location, 3);
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
160 break;
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
161 case RTYPE_THUMB_BL:
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
162 if (irel->location & 1)
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
163 goto align_error;
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
164 irel->addend = thumb_bl_reloc(origbits, irel->location);
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
165 pattern_match[irel->location+0] = 0;
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
166 pattern_match[irel->location+1] &= 0xF8;
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
167 pattern_match[irel->location+2] = 0;
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
168 pattern_match[irel->location+3] &= 0xF8;
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
169 pattern_mask[irel->location+0] = 0;
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
170 pattern_mask[irel->location+1] = 0xF8;
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
171 pattern_mask[irel->location+2] = 0;
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
172 pattern_mask[irel->location+3] = 0xF8;
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
173 break;
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
174 default:
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
175 fprintf(stderr, "error: reloc type 0x%x unsupported\n",
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
176 irel->type);
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
177 exit(2);
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
178 }
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
179 }
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
180 return(1);
c25367bb7656 objgrep: written, compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
181 }