FreeCalypso > hg > freecalypso-reveng
annotate arm7dis/armdis.c @ 89:c5d52666d2eb
armdis: BX/MRS/MSR decoding implemented
author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
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date | Sat, 29 Mar 2014 21:36:22 +0000 |
parents | 691551f0635b |
children | f68d8e7a904f |
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1 #include <sys/types.h> |
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2 #include <stdio.h> |
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3 #include <stdlib.h> |
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4 #include <string.h> |
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5 #include <strings.h> |
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6 |
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7 extern char *binfilename; |
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8 extern u_char *filemap; |
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9 extern unsigned disasm_len, base_vma; |
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10 |
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11 extern unsigned get_u16(), get_u32(); |
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12 |
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13 extern char *regnames[16], *condition_decode[16]; |
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14 |
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15 static char *dataproc_ops[16] = {"and", "eor", "sub", "rsb", |
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16 "add", "adc", "sbc", "rsc", |
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17 "tst", "teq", "cmp", "cmn", |
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18 "orr", "mov", "bic", "mvn"}; |
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19 static char *shift_types[4] = {"lsl", "lsr", "asr", "ror"}; |
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20 |
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21 static void |
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22 arm_branch(off, word) |
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23 unsigned off, word; |
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24 { |
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25 unsigned dest; |
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26 |
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27 dest = (word & 0x00FFFFFF) << 2; |
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28 if (dest & 0x02000000) |
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29 dest |= 0xFC000000; |
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30 dest += base_vma + off + 8; |
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31 printf("b%s%s\t0x%x\n", word&0x1000000 ? "l" : "", |
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32 condition_decode[word>>28], dest); |
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33 } |
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34 |
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35 static void |
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36 op2_immed(word) |
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37 unsigned word; |
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38 { |
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39 unsigned low8, rot, val; |
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40 |
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41 low8 = word & 0xFF; |
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42 rot = (word & 0xF00) >> 7; |
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43 val = (low8 << (32 - rot)) | (low8 >> rot); |
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44 if (val <= 9) |
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45 printf("#%u\n", val); |
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46 else |
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47 printf("#%u\t; 0x%x\n", val, val); |
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48 } |
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49 |
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50 static void |
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51 op2_regbyconst(word) |
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52 unsigned word; |
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53 { |
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54 unsigned c, t; |
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55 |
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56 c = (word >> 7) & 0x1F; |
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57 t = (word >> 5) & 3; |
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58 if (!c) { |
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59 switch (t) { |
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60 case 0: |
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61 printf("%s\n", regnames[word&0xF]); |
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62 return; |
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63 case 3: |
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64 printf("%s, rrx\n", regnames[word&0xF]); |
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65 return; |
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66 default: |
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67 c = 32; |
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68 } |
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69 } |
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70 printf("%s, %s #%u\n", regnames[word&0xF], shift_types[t], c); |
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71 } |
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72 |
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73 static void |
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74 op2_regbyreg(word) |
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75 unsigned word; |
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76 { |
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77 printf("%s, %s %s\n", regnames[word&0xF], shift_types[(word>>5)&3], |
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78 regnames[(word>>8)&0xF]); |
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79 } |
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80 |
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81 static void |
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82 op2_regshift(word) |
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83 unsigned word; |
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84 { |
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85 if (word & 0x10) |
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86 op2_regbyreg(word); |
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87 else |
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88 op2_regbyconst(word); |
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89 } |
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90 |
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91 static void |
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92 dataproc_op2(word) |
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93 unsigned word; |
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94 { |
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95 if (word & 0x02000000) |
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96 op2_immed(word); |
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97 else |
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98 op2_regshift(word); |
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99 } |
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100 |
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101 static void |
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102 dataproc_74_overlay(off, word) |
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103 unsigned off, word; |
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104 { |
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105 printf("<dataproc overlay with 7&4 set>\n"); |
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106 } |
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107 |
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108 static void |
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109 dataproc_tstcmp_overlay(off, word) |
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110 unsigned off, word; |
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111 { |
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112 char msrmask[5], *cp; |
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113 |
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114 if ((word & 0x0FFFFFF0) == 0x012FFF10) { |
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115 printf("bx%s\t%s\n", condition_decode[word>>28], |
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116 regnames[word&0xF]); |
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117 return; |
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118 } else if ((word & 0x0FBF0FFF) == 0x010F0000) { |
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119 printf("mrs%s\t%s, %cPSR\n", condition_decode[word>>28], |
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120 regnames[(word>>12)&0xF], word&0x400000 ? 'S' : 'C'); |
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121 return; |
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122 } else if ((word & 0x0DB0F000) == 0x0120F000) { |
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123 if (!(word & 0x02000000) && (word & 0xFF0)) { |
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124 printf("<invalid MSR>\n"); |
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125 return; |
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126 } |
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127 if (word & 0xF0000) { |
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128 cp = msrmask; |
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129 if (word & 0x80000) |
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130 *cp++ = 'f'; |
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131 if (word & 0x40000) |
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132 *cp++ = 's'; |
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133 if (word & 0x20000) |
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134 *cp++ = 'x'; |
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135 if (word & 0x10000) |
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|
136 *cp++ = 'c'; |
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137 *cp = '\0'; |
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138 } else |
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|
139 strcpy(msrmask, "null"); |
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140 printf("msr%s\t%cPSR_%s, ", condition_decode[word>>28], |
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|
141 word&0x400000 ? 'S' : 'C', msrmask); |
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142 dataproc_op2(word); |
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143 return; |
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|
144 } |
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145 printf("<invalid BX/MRS/MSR>\n"); |
88
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146 } |
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|
147 |
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148 static void |
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149 dataproc(off, word) |
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150 unsigned off, word; |
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151 { |
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152 unsigned opc; |
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153 |
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154 opc = (word >> 21) & 0xF; |
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155 switch (opc) { |
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156 case 0: |
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157 case 1: |
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158 case 2: |
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159 case 3: |
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160 case 4: |
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161 case 5: |
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162 case 6: |
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163 case 7: |
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164 case 0xC: |
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165 case 0xE: |
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166 printf("%s%s%s\t%s, %s, ", dataproc_ops[opc], |
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167 condition_decode[word>>28], word&0x100000 ? "s" : "", |
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168 regnames[(word>>12)&0xF], regnames[(word>>16)&0xF]); |
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169 dataproc_op2(word); |
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170 return; |
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|
171 case 0xD: |
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172 case 0xF: |
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173 printf("%s%s%s\t%s, ", dataproc_ops[opc], |
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|
174 condition_decode[word>>28], word&0x100000 ? "s" : "", |
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|
175 regnames[(word>>12)&0xF]); |
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|
176 dataproc_op2(word); |
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177 return; |
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|
178 case 8: |
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|
179 case 9: |
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|
180 case 0xA: |
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|
181 case 0xB: |
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|
182 if (word & 0x100000) { |
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|
183 printf("%s%s\t%s, ", dataproc_ops[opc], |
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87
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|
184 condition_decode[word>>28], |
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|
185 regnames[(word>>16)&0xF]); |
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|
186 dataproc_op2(word); |
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|
187 } else |
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|
188 dataproc_tstcmp_overlay(off, word); |
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|
189 return; |
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|
190 } |
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87
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|
191 } |
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87
diff
changeset
|
192 |
86
537cf2245d98
beginning of ARM7 disassembler
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
changeset
|
193 void |
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diff
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|
194 arm_disasm_line(off) |
87
f7fba8518fa2
armdis: skeleton compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
86
diff
changeset
|
195 unsigned off; |
86
537cf2245d98
beginning of ARM7 disassembler
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
changeset
|
196 { |
87
f7fba8518fa2
armdis: skeleton compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
86
diff
changeset
|
197 unsigned word; |
86
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beginning of ARM7 disassembler
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
changeset
|
198 |
537cf2245d98
beginning of ARM7 disassembler
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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|
199 word = get_u32(filemap + off); |
537cf2245d98
beginning of ARM7 disassembler
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diff
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|
200 printf("%8x:\t%08x\t", base_vma + off, word); |
537cf2245d98
beginning of ARM7 disassembler
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
changeset
|
201 if ((word >> 28) == 0xF) { |
87
f7fba8518fa2
armdis: skeleton compiles
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86
diff
changeset
|
202 printf("invalid-F\n"); |
86
537cf2245d98
beginning of ARM7 disassembler
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
changeset
|
203 return; |
537cf2245d98
beginning of ARM7 disassembler
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff
changeset
|
204 } |
87
f7fba8518fa2
armdis: skeleton compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
86
diff
changeset
|
205 switch ((word >> 24) & 0xF) { |
f7fba8518fa2
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86
diff
changeset
|
206 case 0: |
f7fba8518fa2
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86
diff
changeset
|
207 case 1: |
88
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87
diff
changeset
|
208 if ((word & 0x90) == 0x90) |
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87
diff
changeset
|
209 dataproc_74_overlay(off, word); |
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87
diff
changeset
|
210 else |
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parents:
87
diff
changeset
|
211 dataproc(off, word); |
87
f7fba8518fa2
armdis: skeleton compiles
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86
diff
changeset
|
212 return; |
f7fba8518fa2
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86
diff
changeset
|
213 case 2: |
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parents:
86
diff
changeset
|
214 case 3: |
88
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diff
changeset
|
215 dataproc(off, word); |
87
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armdis: skeleton compiles
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parents:
86
diff
changeset
|
216 return; |
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86
diff
changeset
|
217 case 4: |
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86
diff
changeset
|
218 case 5: |
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86
diff
changeset
|
219 printf("<ldr/str, immediate offset>\n"); |
f7fba8518fa2
armdis: skeleton compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
86
diff
changeset
|
220 return; |
f7fba8518fa2
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
86
diff
changeset
|
221 case 6: |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
86
diff
changeset
|
222 case 7: |
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
86
diff
changeset
|
223 printf("<ldr/str, register offset>\n"); |
f7fba8518fa2
armdis: skeleton compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
86
diff
changeset
|
224 return; |
f7fba8518fa2
armdis: skeleton compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
86
diff
changeset
|
225 case 8: |
f7fba8518fa2
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
86
diff
changeset
|
226 case 9: |
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parents:
86
diff
changeset
|
227 printf("<ldm/stm>\n"); |
f7fba8518fa2
armdis: skeleton compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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86
diff
changeset
|
228 return; |
f7fba8518fa2
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
86
diff
changeset
|
229 case 0xA: |
f7fba8518fa2
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
86
diff
changeset
|
230 case 0xB: |
f7fba8518fa2
armdis: skeleton compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
86
diff
changeset
|
231 arm_branch(off, word); |
f7fba8518fa2
armdis: skeleton compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
86
diff
changeset
|
232 return; |
f7fba8518fa2
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
86
diff
changeset
|
233 case 0xC: |
f7fba8518fa2
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
86
diff
changeset
|
234 case 0xD: |
f7fba8518fa2
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
86
diff
changeset
|
235 case 0xE: |
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armdis: skeleton compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
86
diff
changeset
|
236 printf("<COPROCESSOR>\n"); |
f7fba8518fa2
armdis: skeleton compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
86
diff
changeset
|
237 return; |
f7fba8518fa2
armdis: skeleton compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
86
diff
changeset
|
238 case 0xF: |
f7fba8518fa2
armdis: skeleton compiles
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
86
diff
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239 printf("swi%s\t0x%x\n", condition_decode[word>>28], |
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240 word & 0xFFFFFF); |
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241 return; |
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242 } |
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243 } |
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244 |
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245 main(argc, argv) |
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246 char **argv; |
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247 { |
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248 unsigned off; |
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249 |
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250 common_init(argc, argv, 4); |
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251 for (off = 0; off < disasm_len; off += 4) |
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252 arm_disasm_line(off); |
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253 exit(0); |
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254 } |