Mercurial > repos > blastem
annotate dis.c @ 46:f2aaaf36c875
Add support for dbcc instruction
author | Mike Pavone <pavone@retrodev.com> |
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date | Wed, 12 Dec 2012 20:18:06 -0800 |
parents | ec71370820f2 |
children | 4b6c667326a1 |
rev | line source |
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2
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1 #include "68kinst.h" |
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2 #include <stdio.h> |
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3 #include <stdlib.h> |
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4 |
44
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5 uint8_t visited[(16*1024*1024)/16]; |
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6 |
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7 void visit(uint32_t address) |
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8 { |
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9 address &= 0xFFFFFF; |
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10 visited[address/16] |= 1 << ((address / 2) % 8); |
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11 } |
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12 |
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13 uint8_t is_visited(uint32_t address) |
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14 { |
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15 address &= 0xFFFFFF; |
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16 return visited[address/16] & (1 << ((address / 2) % 8)); |
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17 } |
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18 |
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19 typedef struct deferred { |
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20 uint32_t address; |
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21 struct deferred *next; |
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22 } deferred; |
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23 |
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24 deferred * defer(uint32_t address, deferred * next) |
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25 { |
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26 if (is_visited(address)) { |
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27 return next; |
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28 } |
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29 deferred * d = malloc(sizeof(deferred)); |
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30 d->address = address; |
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31 d->next = next; |
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32 return d; |
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33 } |
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34 |
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35 #define SIMPLE 0 |
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36 |
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37 int main(int argc, char ** argv) |
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38 { |
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39 long filesize; |
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40 unsigned short *filebuf; |
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41 char disbuf[1024]; |
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42 m68kinst instbuf; |
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43 unsigned short * cur; |
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44 FILE * f = fopen(argv[1], "rb"); |
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45 fseek(f, 0, SEEK_END); |
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46 filesize = ftell(f); |
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47 fseek(f, 0, SEEK_SET); |
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48 filebuf = malloc(filesize); |
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49 fread(filebuf, 2, filesize/2, f); |
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50 fclose(f); |
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51 for(cur = filebuf; cur - filebuf < (filesize/2); ++cur) |
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52 { |
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53 *cur = (*cur >> 8) | (*cur << 8); |
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54 } |
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55 uint32_t address = filebuf[2] << 16 | filebuf[3], tmp_addr; |
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56 #if !SIMPLE |
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57 uint16_t *encoded, *next; |
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58 uint32_t size; |
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59 deferred *def = NULL, *tmpd; |
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60 def = defer(address, def); |
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61 def = defer(filebuf[0x68/2] << 16 | filebuf[0x6A/2], def); |
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62 def = defer(filebuf[0x70/2] << 16 | filebuf[0x72/2], def); |
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63 def = defer(filebuf[0x78/2] << 16 | filebuf[0x7A/2], def); |
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64 while(def) { |
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65 do { |
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66 encoded = NULL; |
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67 address = def->address; |
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68 if (!is_visited(address)) { |
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69 encoded = filebuf + address/2; |
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70 } |
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71 tmpd = def; |
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72 def = def->next; |
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73 free(tmpd); |
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74 } while(def && encoded == NULL); |
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75 if (!encoded) { |
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76 break; |
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77 } |
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78 for(;;) { |
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79 visit(instbuf.address); |
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80 next = m68k_decode(encoded, &instbuf, address); |
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81 address += (next-encoded)*2; |
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82 encoded = next; |
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83 m68k_disasm(&instbuf, disbuf); |
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84 if (instbuf.op == M68K_ILLEGAL || instbuf.op == M68K_RTS || instbuf.op == M68K_RTE) { |
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85 break; |
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86 } else if (instbuf.op == M68K_BCC || instbuf.op == M68K_DBCC || instbuf.op == M68K_BSR) { |
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87 if (instbuf.op == M68K_BCC && instbuf.extra.cond == COND_TRUE) { |
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88 address = instbuf.address + 2 + instbuf.src.params.immed; |
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89 encoded = filebuf + address/2; |
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90 if (is_visited(address)) { |
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91 break; |
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92 } |
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93 } else { |
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94 tmp_addr = instbuf.address + 2 + instbuf.src.params.immed; |
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95 def = defer(tmp_addr, def); |
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96 } |
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97 } else if(instbuf.op == M68K_JMP) { |
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98 if (instbuf.src.addr_mode == MODE_ABSOLUTE || MODE_ABSOLUTE_SHORT) { |
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99 address = instbuf.src.params.immed; |
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100 encoded = filebuf + address/2; |
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101 if (is_visited(address)) { |
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102 break; |
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103 } |
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104 } else { |
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105 break; |
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106 } |
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107 } else if(instbuf.op == M68K_JSR) { |
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108 if (instbuf.src.addr_mode == MODE_ABSOLUTE || MODE_ABSOLUTE_SHORT) { |
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109 def = defer(instbuf.src.params.immed, def); |
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110 } |
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111 } |
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112 } |
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113 } |
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114 for (address = 0; address < filesize; address+=2) { |
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115 if (is_visited(address)) { |
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116 encoded = filebuf + address/2; |
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117 m68k_decode(encoded, &instbuf, address); |
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118 m68k_disasm(&instbuf, disbuf); |
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119 printf("%X: %s\n", instbuf.address, disbuf); |
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120 } |
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121 } |
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122 #else |
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123 for(cur = filebuf + 0x100; (cur - filebuf) < (filesize/2); ) |
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124 { |
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125 //printf("cur: %p: %x\n", cur, *cur); |
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126 unsigned short * start = cur; |
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127 cur = m68k_decode(cur, &instbuf, (start - filebuf)*2); |
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128 m68k_disasm(&instbuf, disbuf); |
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129 printf("%X: %s\n", instbuf.address, disbuf); |
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130 } |
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131 #endif |
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132 return 0; |
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133 } |