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annotate dis.c @ 95:dd3c680c618c

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Initial work on allowing dynamic branches and code in RAM plus a small fix to effective address decoding
author Mike Pavone <pavone@retrodev.com>
date Thu, 27 Dec 2012 21:19:58 -0800
parents 7b1e16e981ef
children a71544cd01ea
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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
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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 //printf("deferring %X\n", address);
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30 deferred * d = malloc(sizeof(deferred));
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31 d->address = address;
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32 d->next = next;
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33 return d;
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34 }
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35
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36 #define SIMPLE 0
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37
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38 int main(int argc, char ** argv)
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39 {
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40 long filesize;
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41 unsigned short *filebuf;
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42 char disbuf[1024];
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43 m68kinst instbuf;
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44 unsigned short * cur;
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45 FILE * f = fopen(argv[1], "rb");
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46 fseek(f, 0, SEEK_END);
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47 filesize = ftell(f);
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48 fseek(f, 0, SEEK_SET);
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49 filebuf = malloc(filesize);
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50 fread(filebuf, 2, filesize/2, f);
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51 fclose(f);
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52 for(cur = filebuf; cur - filebuf < (filesize/2); ++cur)
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53 {
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54 *cur = (*cur >> 8) | (*cur << 8);
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55 }
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56 uint32_t address = filebuf[2] << 16 | filebuf[3], tmp_addr;
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57 #if !SIMPLE
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58 uint16_t *encoded, *next;
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59 uint32_t size;
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60 deferred *def = NULL, *tmpd;
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61 def = defer(address, def);
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62 def = defer(filebuf[0x68/2] << 16 | filebuf[0x6A/2], def);
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63 def = defer(filebuf[0x70/2] << 16 | filebuf[0x72/2], def);
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64 def = defer(filebuf[0x78/2] << 16 | filebuf[0x7A/2], def);
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65 while(def) {
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66 do {
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67 encoded = NULL;
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68 address = def->address;
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69 if (!is_visited(address)) {
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70 encoded = filebuf + address/2;
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71 }
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72 tmpd = def;
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73 def = def->next;
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74 free(tmpd);
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75 } while(def && encoded == NULL);
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76 if (!encoded) {
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77 break;
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78 }
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79 for(;;) {
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80 if (address > filesize) {
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81 break;
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82 }
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83 visit(address);
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84 next = m68k_decode(encoded, &instbuf, address);
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85 address += (next-encoded)*2;
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86 encoded = next;
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87 //m68k_disasm(&instbuf, disbuf);
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88 //printf("%X: %s\n", instbuf.address, disbuf);
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89 if (instbuf.op == M68K_ILLEGAL || instbuf.op == M68K_RTS || instbuf.op == M68K_RTE) {
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90 break;
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91 } else if (instbuf.op == M68K_BCC || instbuf.op == M68K_DBCC || instbuf.op == M68K_BSR) {
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92 if (instbuf.op == M68K_BCC && instbuf.extra.cond == COND_TRUE) {
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93 address = instbuf.address + 2 + instbuf.src.params.immed;
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94 encoded = filebuf + address/2;
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95 if (is_visited(address)) {
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96 break;
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97 }
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98 } else {
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99 tmp_addr = instbuf.address + 2 + instbuf.src.params.immed;
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100 def = defer(tmp_addr, def);
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101 }
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102 } else if(instbuf.op == M68K_JMP) {
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103 if (instbuf.src.addr_mode == MODE_ABSOLUTE || instbuf.src.addr_mode == MODE_ABSOLUTE_SHORT) {
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104 address = instbuf.src.params.immed;
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105 encoded = filebuf + address/2;
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106 if (is_visited(address)) {
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107 break;
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108 }
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109 } else {
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110 break;
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111 }
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112 } else if(instbuf.op == M68K_JSR) {
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113 if (instbuf.src.addr_mode == MODE_ABSOLUTE || instbuf.src.addr_mode == MODE_ABSOLUTE_SHORT) {
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114 def = defer(instbuf.src.params.immed, def);
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115 }
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116 }
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117 }
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118 }
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119 for (address = 0; address < filesize; address+=2) {
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120 if (is_visited(address)) {
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121 encoded = filebuf + address/2;
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122 m68k_decode(encoded, &instbuf, address);
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123 m68k_disasm(&instbuf, disbuf);
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124 printf("%X: %s\n", instbuf.address, disbuf);
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125 }
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126 }
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127 #else
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128 for(cur = filebuf + 0x100; (cur - filebuf) < (filesize/2); )
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129 {
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130 unsigned short * start = cur;
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131 cur = m68k_decode(cur, &instbuf, (start - filebuf)*2);
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132 m68k_disasm(&instbuf, disbuf);
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133 printf("%X: %s\n", instbuf.address, disbuf);
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134 }
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135 #endif
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136 return 0;
5df303bf72e6 Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
137 }