FreeCalypso > hg > freecalypso-reveng
annotate objgrep/mkpattern.c @ 302:844ebeb9a5c6
dsample-fw-disasm: rf_program() and l1dmacro_agc() analysed
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 05 Oct 2019 23:47:32 +0000 |
parents | 77cd647375e5 |
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rev | line source |
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167
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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 |
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5 #include <sys/types.h> |
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6 #include <stdio.h> |
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7 #include <stdint.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 "coffconst.h" |
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14 #include "globals.h" |
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15 |
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16 extern unsigned get_u16(), get_u32(); |
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17 |
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18 static unsigned |
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19 arm_branch_reloc(origbits, location) |
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20 u_char *origbits; |
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21 unsigned location; |
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22 { |
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23 unsigned word, dest; |
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24 |
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25 word = get_u32(origbits + location); |
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26 if ((word & 0x0E000000) != 0x0A000000) { |
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27 fprintf(stderr, |
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28 "error: invalid ARM_B reloc: opcode not B or BL\n"); |
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29 exit(2); |
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30 } |
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31 dest = (word & 0x00FFFFFF) << 2; |
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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); |
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48 if ((ins1 & 0xF800) != 0xF000 || (ins2 & 0xF800) != 0xF800) { |
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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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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; |
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65 struct external_reloc *xrel; |
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66 unsigned lastloc, symidx; |
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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; |
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70 pattern_len = (grep_section->size + 3) & ~3; |
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71 pattern_match = malloc(pattern_len); |
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72 if (!pattern_match) { |
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73 perror("malloc"); |
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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; |
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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 } |
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88 if (!grep_section->nreloc) |
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89 return(0); |
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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); |
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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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104 lastloc = irel->location + 4; |
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105 if (lastloc > grep_section->size) { |
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106 fprintf(stderr, |
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107 "error: reloc spills past the end of the section\n"); |
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108 exit(2); |
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109 } |
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110 symidx = get_u32(xrel->r_symndx); |
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111 if (symidx == 0xFFFFFFFF) |
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112 sym = 0; |
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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"); |
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123 exit(2); |
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124 } |
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125 if (!sym) { |
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126 irel->secbase = grep_section; |
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127 irel->extsym = 0; |
173
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128 nreloc_int++; |
168
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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 && |
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134 !strcmp(sym->name, sym->section->name)) { |
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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 { |
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139 fprintf(stderr, "error: unable to grok reloc\n"); |
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140 exit(2); |
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141 } |
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142 irel->type = get_u16(xrel->r_type); |
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143 switch (irel->type) { |
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144 case RTYPE_LONG: |
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145 if (irel->location & 3) { |
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146 align_error: fprintf(stderr, "error: misaligned reloc\n"); |
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147 exit(2); |
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148 } |
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149 irel->addend = get_u32(origbits + irel->location); |
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150 *(uint32_t *)(pattern_match + irel->location) = 0; |
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151 *(uint32_t *)(pattern_mask + irel->location) = 0; |
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152 break; |
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153 case RTYPE_ARM_B: |
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154 if (irel->location & 3) |
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155 goto align_error; |
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156 irel->addend = arm_branch_reloc(origbits, |
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157 irel->location); |
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158 bzero(pattern_match + irel->location, 3); |
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159 bzero(pattern_mask + irel->location, 3); |
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160 break; |
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161 case RTYPE_THUMB_BL: |
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162 if (irel->location & 1) |
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163 goto align_error; |
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164 irel->addend = thumb_bl_reloc(origbits, irel->location); |
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165 pattern_match[irel->location+0] = 0; |
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166 pattern_match[irel->location+1] &= 0xF8; |
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167 pattern_match[irel->location+2] = 0; |
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168 pattern_match[irel->location+3] &= 0xF8; |
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169 pattern_mask[irel->location+0] = 0; |
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170 pattern_mask[irel->location+1] = 0xF8; |
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171 pattern_mask[irel->location+2] = 0; |
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172 pattern_mask[irel->location+3] = 0xF8; |
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173 break; |
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174 default: |
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175 fprintf(stderr, "error: reloc type 0x%x unsupported\n", |
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176 irel->type); |
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177 exit(2); |
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178 } |
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179 } |
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180 return(1); |
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181 } |