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Fix bug in MED mapper protection bit implementation
author Michael Pavone <pavone@retrodev.com>
date Sun, 28 Apr 2024 23:33:11 -0700
parents bf1bb893f104
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 Copyright 2013 Michael Pavone
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3 This file is part of BlastEm.
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4 BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text.
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5 */
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6 #include "68kinst.h"
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <string.h>
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10 #include <stdarg.h>
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11 #include <ctype.h>
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12 #include "vos_program_module.h"
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13 #include "tern.h"
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14 #include "util.h"
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15 #include "disasm.h"
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16
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17 int headless;
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18 void render_errorbox(char *title, char *message) {}
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19 void render_warnbox(char *title, char *message) {}
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20 void render_infobox(char *title, char *message) {}
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21
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22 void check_reference(disasm_context *context, m68kinst * inst, m68k_op_info * op)
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23 {
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24 switch(op->addr_mode)
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25 {
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26 case MODE_PC_DISPLACE:
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27 reference(context, inst->address + 2 + op->params.regs.displacement);
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28 break;
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29 case MODE_ABSOLUTE:
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30 case MODE_ABSOLUTE_SHORT:
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31 reference(context, op->params.immed);
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32 break;
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33 }
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34 }
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35
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36 typedef struct {
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37 uint32_t address_off;
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38 uint32_t address_end;
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39 uint16_t *buffer;
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40 } rom_def;
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41
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42 uint16_t fetch(uint32_t address, void *data)
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43 {
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44 rom_def *rom = data;
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45 address &= 0xFFFFFF;
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46 if (address >= rom->address_off && address < rom->address_end) {
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47 return rom->buffer[(address - rom->address_off) >> 1];
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48 }
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49 return 0;
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50 }
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51
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52 void print_label_def(char *key, tern_val val, uint8_t valtype, void *data)
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53 {
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54 rom_def *rom = data;
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55 label_def *label = val.ptrval;
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56 uint32_t address = label->full_address & 0xFFFFFFF;
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57 if (address >= rom->address_off && address < rom->address_end) {
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58 return;
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59 }
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60 if (!label->referenced) {
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61 return;
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62 }
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63 if (label->num_labels) {
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64 for (int i = 0; i < label->num_labels; i++)
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65 {
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66 printf("%s equ $%X\n", label->labels[i], label->full_address);
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67 }
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68 } else {
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69 printf("ADR_%X equ $%X\n", label->full_address, label->full_address);
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70 }
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71 }
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72
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73 int main(int argc, char ** argv)
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74 {
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75 long filesize;
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76 unsigned short *filebuf = NULL;
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77 char disbuf[1024];
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78 m68kinst instbuf;
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79 unsigned short * cur;
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80
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81 uint8_t labels = 0, addr = 0, only = 0, vos = 0, reset = 0;
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82 disasm_context *context = create_68000_disasm();
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83
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84
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85 uint32_t address_off = 0, address_end;
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86 uint8_t do_cd_labels = 0, main_cpu = 0;
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87 for(uint8_t opt = 2; opt < argc; ++opt) {
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88 if (argv[opt][0] == '-') {
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89 FILE * address_log;
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90 switch (argv[opt][1])
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91 {
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92 case 'l':
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93 labels = 1;
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94 break;
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95 case 'a':
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96 addr = 1;
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97 break;
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98 case 'o':
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99 only = 1;
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100 break;
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101 case 'v':
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102 vos = 1;
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103 break;
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104 case 'r':
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105 reset = 1;
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106 break;
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107 case 'c':
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108 do_cd_labels = 1;
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109 break;
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110 case 'm':
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111 main_cpu = 1;
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112 break;
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113 case 's':
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114 opt++;
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115 if (opt >= argc) {
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116 fputs("-s must be followed by an offset\n", stderr);
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117 exit(1);
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118 }
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119 address_off = strtol(argv[opt], NULL, 0);
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120 break;
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121 case 'f':
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122 opt++;
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123 if (opt >= argc) {
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124 fputs("-f must be followed by a filename\n", stderr);
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125 exit(1);
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126 }
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127 address_log = fopen(argv[opt], "r");
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128 if (!address_log) {
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129 fprintf(stderr, "Failed to open %s for reading\n", argv[opt]);
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130 exit(1);
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131 }
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132 while (fgets(disbuf, sizeof(disbuf), address_log)) {
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133 if (disbuf[0]) {
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134 char *end;
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135 uint32_t address = strtol(disbuf, &end, 16);
197
7c227a8ec53d Add instruction address logging to translator and support for reading an address log to the disassembler
Mike Pavone <pavone@retrodev.com>
parents: 164
diff changeset
136 if (address) {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
137 defer_disasm(context, address);
947
d29722e3359c Allow specification of named labels as command line arguments to the 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 805
diff changeset
138 if (*end == '=') {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
139 add_label(context, strip_ws(end+1), address);
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
140 } else {
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
141 reference(context, address);
947
d29722e3359c Allow specification of named labels as command line arguments to the 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 805
diff changeset
142 }
197
7c227a8ec53d Add instruction address logging to translator and support for reading an address log to the disassembler
Mike Pavone <pavone@retrodev.com>
parents: 164
diff changeset
143 }
7c227a8ec53d Add instruction address logging to translator and support for reading an address log to the disassembler
Mike Pavone <pavone@retrodev.com>
parents: 164
diff changeset
144 }
7c227a8ec53d Add instruction address logging to translator and support for reading an address log to the disassembler
Mike Pavone <pavone@retrodev.com>
parents: 164
diff changeset
145 }
1594
137dbd05ceab Fix some issues identified by cppcheck
Michael Pavone <pavone@retrodev.com>
parents: 1078
diff changeset
146 fclose(address_log);
134
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
147 }
151
6b593ea0ed90 Implement MULU/MULS and DIVU/DIVS
Mike Pavone <pavone@retrodev.com>
parents: 148
diff changeset
148 } else {
947
d29722e3359c Allow specification of named labels as command line arguments to the 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 805
diff changeset
149 char *end;
d29722e3359c Allow specification of named labels as command line arguments to the 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 805
diff changeset
150 uint32_t address = strtol(argv[opt], &end, 16);
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
151 defer_disasm(context, address);
947
d29722e3359c Allow specification of named labels as command line arguments to the 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 805
diff changeset
152 if (*end == '=') {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
153 add_label(context, end+1, address);
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
154 } else {
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
155 reference(context, address);
947
d29722e3359c Allow specification of named labels as command line arguments to the 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 805
diff changeset
156 }
134
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
157 }
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
158 }
631
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
159 FILE * f = fopen(argv[1], "rb");
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
160 fseek(f, 0, SEEK_END);
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
161 filesize = ftell(f);
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
162 fseek(f, 0, SEEK_SET);
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
163
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
164 char int_key[MAX_INT_KEY_SIZE];
2091
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
165 uint8_t is_scd_iso = 0;
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
166 uint8_t has_manual_defs = !!context->deferred;
631
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
167 if (vos)
2
5df303bf72e6 Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
168 {
631
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
169 vos_program_module header;
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
170 vos_read_header(f, &header);
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
171 vos_read_alloc_module_map(f, &header);
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
172 address_off = header.user_boundary;
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
173 address_end = address_off + filesize - 0x1000;
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
174 defer_disasm(context, header.main_entry_link.code_address);
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
175 add_label(context, "main_entry_link", header.main_entry_link.code_address);
631
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
176 for (int i = 0; i < header.n_modules; i++)
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
177 {
632
80e111b48d4b Add -r option to indicate VOS program module contains a 68K reset vector
Michael Pavone <pavone@retrodev.com>
parents: 631
diff changeset
178 if (!reset || header.module_map_entries[i].code_address != header.user_boundary)
80e111b48d4b Add -r option to indicate VOS program module contains a 68K reset vector
Michael Pavone <pavone@retrodev.com>
parents: 631
diff changeset
179 {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
180 defer_disasm(context, header.module_map_entries[i].code_address);
632
80e111b48d4b Add -r option to indicate VOS program module contains a 68K reset vector
Michael Pavone <pavone@retrodev.com>
parents: 631
diff changeset
181 }
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
182 add_label(context, header.module_map_entries[i].name.str, header.module_map_entries[i].code_address);
631
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
183 }
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
184 fseek(f, 0x1000, SEEK_SET);
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
185 filebuf = malloc(filesize - 0x1000);
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
186 if (fread(filebuf, 2, (filesize - 0x1000)/2, f) != (filesize - 0x1000)/2)
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
187 {
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
188 fprintf(stderr, "Failure while reading file %s\n", argv[1]);
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
189 }
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
190 fclose(f);
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
191 for(cur = filebuf; cur - filebuf < ((filesize - 0x1000)/2); ++cur)
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
192 {
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
193 *cur = (*cur >> 8) | (*cur << 8);
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
194 }
632
80e111b48d4b Add -r option to indicate VOS program module contains a 68K reset vector
Michael Pavone <pavone@retrodev.com>
parents: 631
diff changeset
195 if (reset)
80e111b48d4b Add -r option to indicate VOS program module contains a 68K reset vector
Michael Pavone <pavone@retrodev.com>
parents: 631
diff changeset
196 {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
197 defer_disasm(context, filebuf[2] << 16 | filebuf[3]);
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
198 add_label(context, "reset", filebuf[2] << 16 | filebuf[3]);
632
80e111b48d4b Add -r option to indicate VOS program module contains a 68K reset vector
Michael Pavone <pavone@retrodev.com>
parents: 631
diff changeset
199 }
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
200 } else if (filesize > 0x1000) {
2251
80dde7fb445b Fix bug in disassembler SCD header handling
Michael Pavone <pavone@retrodev.com>
parents: 2213
diff changeset
201 long boot_size = filesize > (16*2352) ? 16*2352 : filesize;
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
202 filebuf = malloc(boot_size);
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
203 if (fread(filebuf, 1, boot_size, f) != boot_size) {
631
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
204 fprintf(stderr, "Failure while reading file %s\n", argv[1]);
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
205 return 1;
631
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
206 }
2091
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
207 is_scd_iso = !memcmp("SEGADISCSYSTEM ", filebuf, 0x10);
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
208 if (!is_scd_iso && !memcmp("SEGADISCSYSTEM ", filebuf + 0x8, 0x10)) {
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
209 is_scd_iso = 1;
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
210 uint32_t end = 16 * 2352;
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
211 if (end > filesize) {
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
212 end = (filesize / 2352) * 2352;
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
213 }
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
214 for(uint32_t offset = 0x10, dst_offset = 0; offset < end; offset += 2352, dst_offset += 2048)
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
215 {
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
216 memmove(filebuf + dst_offset/2, filebuf + offset/2, 2048);
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
217 }
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
218 boot_size = (end / 2352) * 2048;
631
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
219 }
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
220 if (is_scd_iso) {
2105
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
221 fclose(f);
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
222 for(cur = filebuf; cur - filebuf < (boot_size/2); ++cur)
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
223 {
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
224 *cur = (*cur >> 8) | (*cur << 8);
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
225 }
2105
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
226 if (main_cpu) {
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
227 uint32_t main_start = 0x200;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
228 uint32_t extra_start = filebuf[0x30/2] << 16 | filebuf[0x32/2];
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
229 uint32_t main_end = (filebuf[0x34/2] << 16 | filebuf[0x36/2]) + extra_start;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
230 if (main_end > boot_size) {
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
231 main_end = boot_size;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
232 }
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
233 address_off = 0xFF0000;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
234 address_end = address_off + main_end-main_start;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
235 filebuf += main_start / 2;
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
236 add_label(context, "start", 0xFF0000);
2105
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
237 if (!has_manual_defs || !only) {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
238 defer_disasm(context, 0xFF0000);
2105
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
239 }
2110
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
240 uint32_t user_start;
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
241 if (filebuf[0xA/2] == 0x57A) {
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
242 //US
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
243 user_start = 0xFF0584;
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
244 } else if (filebuf[0xA/2] == 0x564) {
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
245 //EU
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
246 user_start = 0xFF056E;
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
247 } else {
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
248 //JP
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
249 user_start = 0xFF0156;
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
250 }
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
251 add_label(context, "user_start", user_start);
2105
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
252 do_cd_labels = 1;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
253 } else {
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
254 uint32_t sub_start =filebuf[0x40/2] << 16 | filebuf[0x42/2];
2274
bf1bb893f104 Properly ignore low bits of SP start address in disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2273
diff changeset
255 sub_start &= ~0x7FF;
2146
0c0d4233d826 Fix SP end address in disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2132
diff changeset
256 uint32_t sub_end = sub_start + (filebuf[0x44/2] << 16 | filebuf[0x46/2]);
2105
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
257 if (sub_start > (boot_size - 0x20)) {
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
258 fprintf(stderr, "System Program start offset is %X, but image is only %X bytes\n", sub_start, (uint32_t)boot_size);
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
259 return 1;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
260 }
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
261 if (sub_end > boot_size) {
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
262 sub_end = boot_size;
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
263 }
2105
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
264 uint32_t offset_start = (filebuf[(sub_start + 0x18)/2] << 16 | filebuf[(sub_start + 0x1A)/2]) + sub_start;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
265 for(uint32_t cur = offset_start, index = 0; cur < sub_end && filebuf[cur/2]; cur+=2, ++index)
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
266 {
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
267 uint32_t offset = offset_start + filebuf[cur/2];
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
268 if (offset >= boot_size) {
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
269 break;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
270 }
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
271 static const char* fixed_names[3] = {
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
272 "init",
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
273 "main",
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
274 "int_2"
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
275 };
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
276 char namebuf[32];
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
277 const char *name;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
278 if (index < 3) {
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
279 name = fixed_names[index];
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
280 } else {
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
281 name = namebuf;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
282 sprintf(namebuf, "usercall%u", index);
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
283 }
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
284 uint32_t address = 0x6000 + offset - sub_start;
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
285 add_label(context, name, address);
2105
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
286 if (!has_manual_defs || !only) {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
287 defer_disasm(context, address);
2105
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
288 }
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
289 }
2105
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
290
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
291 do_cd_labels = 1;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
292 filebuf += sub_start / 2;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
293 address_off = 0x6000;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
294 address_end = sub_end-sub_start + address_off;
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
295 }
2091
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
296 }
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
297 }
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
298 if (!vos && !is_scd_iso) {
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
299 if (filebuf) {
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
300 if (filesize > (32*1024)) {
2091
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
301 filebuf = realloc(filebuf, filesize);
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
302 fseek(f, 32*1024, SEEK_SET);
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
303 uint32_t to_read = filesize/2 - 16*1024;
2091
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
304 if (fread(filebuf + 16*1024, 2, to_read, f) != to_read)
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
305 {
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
306 fprintf(stderr, "Failure while reading file %s\n", argv[1]);
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
307 }
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
308 }
2091
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
309 } else {
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
310 filebuf = malloc(filesize);
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
311 if (fread(filebuf, 2, filesize/2, f) != filesize/2)
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
312 {
2091
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
313 fprintf(stderr, "Failure while reading file %s\n", argv[1]);
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
314 }
2091
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
315 }
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
316 address_end = address_off + filesize;
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
317 fclose(f);
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
318 for(cur = filebuf; cur - filebuf < (filesize/2); ++cur)
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
319 {
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
320 *cur = (*cur >> 8) | (*cur << 8);
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
321 }
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
322 if (!address_off) {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
323 process_m68k_vectors(context, filebuf, context->deferred && only);
631
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
324 }
2
5df303bf72e6 Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
325 }
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
326 if (do_cd_labels) {
2105
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
327 if (main_cpu) {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
328 add_segacd_maincpu_labels(context);
2105
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
329 } else {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
330 add_segacd_subcpu_labels(context);
2105
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
331 }
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
332 }
631
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
333 uint32_t size, tmp_addr;
139
cce22fb4c450 Properly support references to odd addresses in label generation in disassembler. Add labels for start and interrupts.
Mike Pavone <pavone@retrodev.com>
parents: 134
diff changeset
334 uint32_t address;
2132
7451f970ee66 Add some weak labels for a few exception vectors in disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2110
diff changeset
335 rom_def rom = {
7451f970ee66 Add some weak labels for a few exception vectors in disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2110
diff changeset
336 .address_off = address_off,
7451f970ee66 Add some weak labels for a few exception vectors in disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2110
diff changeset
337 .address_end = address_end,
7451f970ee66 Add some weak labels for a few exception vectors in disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2110
diff changeset
338 .buffer = filebuf
7451f970ee66 Add some weak labels for a few exception vectors in disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2110
diff changeset
339 };
7451f970ee66 Add some weak labels for a few exception vectors in disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2110
diff changeset
340 uint8_t valid_address;
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
341 while(context->deferred) {
44
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
342 do {
2132
7451f970ee66 Add some weak labels for a few exception vectors in disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2110
diff changeset
343 valid_address = 0;
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
344 address = context->deferred->address;
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
345 if (!is_visited(context, address)) {
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
346 address &= context->address_mask;
2132
7451f970ee66 Add some weak labels for a few exception vectors in disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2110
diff changeset
347 if (address < address_end && address >= address_off) {
7451f970ee66 Add some weak labels for a few exception vectors in disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2110
diff changeset
348 valid_address = 1;
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
349 address = context->deferred->address;
2091
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
350 }
44
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
351 }
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
352 deferred_addr *tmpd = context->deferred;
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
353 context->deferred = context->deferred->next;
44
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
354 free(tmpd);
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
355 } while(context->deferred && !valid_address);
2132
7451f970ee66 Add some weak labels for a few exception vectors in disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2110
diff changeset
356 if (!valid_address) {
44
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
357 break;
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
358 }
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
359 for(;;) {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
360 if ((address & context->address_mask) > address_end || address < address_off) {
48
0bdda50c7364 Don't try to disassemble addresses beyond the end of the cartridge
Mike Pavone <pavone@retrodev.com>
parents: 47
diff changeset
361 break;
0bdda50c7364 Don't try to disassemble addresses beyond the end of the cartridge
Mike Pavone <pavone@retrodev.com>
parents: 47
diff changeset
362 }
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
363 visit(context, address);
2132
7451f970ee66 Add some weak labels for a few exception vectors in disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2110
diff changeset
364 address = m68k_decode(fetch, &rom, &instbuf, address);
111
8b50d2c975b2 Fix decoding of Scc
Mike Pavone <pavone@retrodev.com>
parents: 103
diff changeset
365 //m68k_disasm(&instbuf, disbuf);
8b50d2c975b2 Fix decoding of Scc
Mike Pavone <pavone@retrodev.com>
parents: 103
diff changeset
366 //printf("%X: %s\n", instbuf.address, disbuf);
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
367 check_reference(context, &instbuf, &(instbuf.src));
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
368 check_reference(context, &instbuf, &(instbuf.dst));
148
4a400aec81bb Bail out of disassembly of a particular stream when we hit an invalid instruction
Mike Pavone <pavone@retrodev.com>
parents: 139
diff changeset
369 if (instbuf.op == M68K_ILLEGAL || instbuf.op == M68K_RTS || instbuf.op == M68K_RTE || instbuf.op == M68K_INVALID) {
44
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
370 break;
164
afbfb0ac0256 Small fix to disassembler
Mike Pavone <pavone@retrodev.com>
parents: 151
diff changeset
371 }
afbfb0ac0256 Small fix to disassembler
Mike Pavone <pavone@retrodev.com>
parents: 151
diff changeset
372 if (instbuf.op == M68K_BCC || instbuf.op == M68K_DBCC || instbuf.op == M68K_BSR) {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
373 tmp_addr = instbuf.address + 2 + instbuf.src.params.immed;
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
374 reference(context, tmp_addr);
44
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
375 if (instbuf.op == M68K_BCC && instbuf.extra.cond == COND_TRUE) {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
376 address = tmp_addr;
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
377 if (is_visited(context, address)) {
44
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
378 break;
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
379 }
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
380 } else {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
381 defer_disasm(context, tmp_addr);
44
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
382 }
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
383 } else if(instbuf.op == M68K_JMP) {
80
7b1e16e981ef Fix bug in disassembler that caused it to disassemble addresses it shouldn't
Mike Pavone <pavone@retrodev.com>
parents: 48
diff changeset
384 if (instbuf.src.addr_mode == MODE_ABSOLUTE || instbuf.src.addr_mode == MODE_ABSOLUTE_SHORT) {
44
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
385 address = instbuf.src.params.immed;
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
386 if (is_visited(context, address)) {
44
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
387 break;
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
388 }
564
316facea756d Fix PC displacement mode check in disassembler so that jmps involving a register are handled correctly
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
389 } else if (instbuf.src.addr_mode == MODE_PC_DISPLACE) {
114
e821b6fde0e4 Allow jmp/jsr to follow pc-relative addresses in disassembler
Mike Pavone <pavone@retrodev.com>
parents: 111
diff changeset
390 address = instbuf.src.params.regs.displacement + instbuf.address + 2;
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
391 if (is_visited(context, address)) {
114
e821b6fde0e4 Allow jmp/jsr to follow pc-relative addresses in disassembler
Mike Pavone <pavone@retrodev.com>
parents: 111
diff changeset
392 break;
e821b6fde0e4 Allow jmp/jsr to follow pc-relative addresses in disassembler
Mike Pavone <pavone@retrodev.com>
parents: 111
diff changeset
393 }
44
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
394 } else {
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parents: 20
diff changeset
395 break;
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parents: 20
diff changeset
396 }
ec71370820f2 Add logic for following control flow based on logic in the translator
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parents: 20
diff changeset
397 } else if(instbuf.op == M68K_JSR) {
80
7b1e16e981ef Fix bug in disassembler that caused it to disassemble addresses it shouldn't
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parents: 48
diff changeset
398 if (instbuf.src.addr_mode == MODE_ABSOLUTE || instbuf.src.addr_mode == MODE_ABSOLUTE_SHORT) {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
399 defer_disasm(context, instbuf.src.params.immed);
164
afbfb0ac0256 Small fix to disassembler
Mike Pavone <pavone@retrodev.com>
parents: 151
diff changeset
400 } else if (instbuf.src.addr_mode == MODE_PC_DISPLACE) {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
401 defer_disasm(context, instbuf.src.params.regs.displacement + instbuf.address + 2);
44
ec71370820f2 Add logic for following control flow based on logic in the translator
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parents: 20
diff changeset
402 }
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
403 }
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
404 }
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
405 }
134
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
406 if (labels) {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
407 tern_foreach(context->labels, print_label_def, &rom);
134
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
408 puts("");
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
409 }
633
a759f4e38488 Fix translation of 68K address to buffer location when address_off != 0
Michael Pavone <pavone@retrodev.com>
parents: 632
diff changeset
410 for (address = address_off; address < address_end; address+=2) {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
411 if (is_visited(context, address)) {
2132
7451f970ee66 Add some weak labels for a few exception vectors in disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2110
diff changeset
412 m68k_decode(fetch, &rom, &instbuf, address);
134
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
413 if (labels) {
2213
53411df7fc71 More 68K disassembler refactoring and fix Windows build failure
Michael Pavone <pavone@retrodev.com>
parents: 2206
diff changeset
414 m68k_disasm_labels(&instbuf, disbuf, context);
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
415 label_def *label = find_label(context, address);
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
416 if (label) {
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
417 if (label->num_labels) {
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
418 for (int i = 0; i < label->num_labels; i++)
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
419 {
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
420 printf("%s:\n", label->labels[i]);
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
421 }
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
422 } else {
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
423 printf("ADR_%X:\n", label->full_address);
631
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
424 }
134
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
425 }
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
426 if (addr) {
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
427 printf("\t%s\t;%X\n", disbuf, instbuf.address);
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
428 } else {
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
429 printf("\t%s\n", disbuf);
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
430 }
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
431 } else {
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
432 m68k_disasm(&instbuf, disbuf);
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
433 printf("%X: %s\n", instbuf.address, disbuf);
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
434 }
44
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
435 }
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
436 }
2
5df303bf72e6 Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
437 return 0;
5df303bf72e6 Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
438 }