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annotate dis.c @ 2268:5b308c7b098c

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Avoid code mem allocation bomb when a div instruction gets rewritten
author Michael Pavone <pavone@retrodev.com>
date Sun, 25 Dec 2022 18:16:44 -0800
parents 80dde7fb445b
children ff726f53d75a
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 if (address >= rom->address_off && address < rom->address_end) {
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46 return rom->buffer[((address & 0xFFFFFF) - rom->address_off) >> 1];
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47 }
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48 return 0;
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49 }
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50
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51 void print_label_def(char *key, tern_val val, uint8_t valtype, void *data)
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52 {
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53 rom_def *rom = data;
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54 label_def *label = val.ptrval;
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55 uint32_t address = label->full_address & 0xFFFFFFF;
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56 if (address >= rom->address_off && address < rom->address_end) {
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57 return;
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58 }
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59 if (!label->referenced) {
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60 return;
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61 }
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62 if (label->num_labels) {
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63 for (int i = 0; i < label->num_labels; i++)
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64 {
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65 printf("%s equ $%X\n", label->labels[i], label->full_address);
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66 }
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67 } else {
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68 printf("ADR_%X equ $%X\n", label->full_address, label->full_address);
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69 }
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70 }
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71
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72 int main(int argc, char ** argv)
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73 {
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74 long filesize;
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75 unsigned short *filebuf = NULL;
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76 char disbuf[1024];
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77 m68kinst instbuf;
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78 unsigned short * cur;
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79
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80 uint8_t labels = 0, addr = 0, only = 0, vos = 0, reset = 0;
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81 disasm_context *context = create_68000_disasm();
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82
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83
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84 uint32_t address_off = 0, address_end;
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85 uint8_t do_cd_labels = 0, main_cpu = 0;
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86 for(uint8_t opt = 2; opt < argc; ++opt) {
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87 if (argv[opt][0] == '-') {
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88 FILE * address_log;
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89 switch (argv[opt][1])
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90 {
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91 case 'l':
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92 labels = 1;
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93 break;
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94 case 'a':
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95 addr = 1;
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96 break;
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97 case 'o':
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98 only = 1;
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99 break;
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100 case 'v':
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101 vos = 1;
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102 break;
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103 case 'r':
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104 reset = 1;
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105 break;
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106 case 'c':
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107 do_cd_labels = 1;
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108 break;
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109 case 'm':
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110 main_cpu = 1;
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111 break;
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112 case 's':
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113 opt++;
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114 if (opt >= argc) {
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115 fputs("-s must be followed by an offset\n", stderr);
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116 exit(1);
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117 }
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118 address_off = strtol(argv[opt], NULL, 0);
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119 break;
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120 case 'f':
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121 opt++;
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122 if (opt >= argc) {
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123 fputs("-f must be followed by a filename\n", stderr);
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124 exit(1);
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125 }
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126 address_log = fopen(argv[opt], "r");
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127 if (!address_log) {
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128 fprintf(stderr, "Failed to open %s for reading\n", argv[opt]);
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129 exit(1);
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130 }
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131 while (fgets(disbuf, sizeof(disbuf), address_log)) {
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132 if (disbuf[0]) {
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133 char *end;
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134 uint32_t address = strtol(disbuf, &end, 16);
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135 if (address) {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
136 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
137 if (*end == '=') {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
138 add_label(context, strip_ws(end+1), address);
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
139 } else {
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
140 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
141 }
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
142 }
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 }
1594
137dbd05ceab Fix some issues identified by cppcheck
Michael Pavone <pavone@retrodev.com>
parents: 1078
diff changeset
145 fclose(address_log);
134
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
146 }
151
6b593ea0ed90 Implement MULU/MULS and DIVU/DIVS
Mike Pavone <pavone@retrodev.com>
parents: 148
diff changeset
147 } 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
148 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
149 uint32_t address = strtol(argv[opt], &end, 16);
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
150 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
151 if (*end == '=') {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
152 add_label(context, end+1, address);
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
153 } else {
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
154 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
155 }
134
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
156 }
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
157 }
631
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
158 FILE * f = fopen(argv[1], "rb");
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
159 fseek(f, 0, SEEK_END);
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
160 filesize = ftell(f);
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
161 fseek(f, 0, SEEK_SET);
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
162
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
163 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
164 uint8_t is_scd_iso = 0;
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
165 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
166 if (vos)
2
5df303bf72e6 Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
167 {
631
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
168 vos_program_module header;
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
169 vos_read_header(f, &header);
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
170 vos_read_alloc_module_map(f, &header);
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
171 address_off = header.user_boundary;
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
172 address_end = address_off + filesize - 0x1000;
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
173 defer_disasm(context, header.main_entry_link.code_address);
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
174 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
175 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
176 {
632
80e111b48d4b Add -r option to indicate VOS program module contains a 68K reset vector
Michael Pavone <pavone@retrodev.com>
parents: 631
diff changeset
177 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
178 {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
179 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
180 }
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
181 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
182 }
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
183 fseek(f, 0x1000, SEEK_SET);
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
184 filebuf = malloc(filesize - 0x1000);
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
185 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
186 {
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
187 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
188 }
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
189 fclose(f);
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
190 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
191 {
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
192 *cur = (*cur >> 8) | (*cur << 8);
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
193 }
632
80e111b48d4b Add -r option to indicate VOS program module contains a 68K reset vector
Michael Pavone <pavone@retrodev.com>
parents: 631
diff changeset
194 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
195 {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
196 defer_disasm(context, filebuf[2] << 16 | filebuf[3]);
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
197 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
198 }
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
199 } else if (filesize > 0x1000) {
2251
80dde7fb445b Fix bug in disassembler SCD header handling
Michael Pavone <pavone@retrodev.com>
parents: 2213
diff changeset
200 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
201 filebuf = malloc(boot_size);
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
202 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
203 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
204 return 1;
631
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
205 }
2091
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
206 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
207 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
208 is_scd_iso = 1;
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
209 uint32_t end = 16 * 2352;
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
210 if (end > filesize) {
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
211 end = (filesize / 2352) * 2352;
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
212 }
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
213 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
214 {
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
215 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
216 }
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
217 boot_size = (end / 2352) * 2048;
631
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
218 }
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
219 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
220 fclose(f);
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
221 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
222 {
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
223 *cur = (*cur >> 8) | (*cur << 8);
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
224 }
2105
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
225 if (main_cpu) {
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
226 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
227 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
228 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
229 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
230 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 }
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
232 address_off = 0xFF0000;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
233 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
234 filebuf += main_start / 2;
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
235 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
236 if (!has_manual_defs || !only) {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
237 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
238 }
2110
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
239 uint32_t user_start;
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
240 if (filebuf[0xA/2] == 0x57A) {
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
241 //US
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
242 user_start = 0xFF0584;
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
243 } else if (filebuf[0xA/2] == 0x564) {
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
244 //EU
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
245 user_start = 0xFF056E;
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
246 } else {
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
247 //JP
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
248 user_start = 0xFF0156;
f1238ffb30a3 Some very minor Sega CD disassembler improvements
Michael Pavone <pavone@retrodev.com>
parents: 2105
diff changeset
249 }
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
250 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
251 do_cd_labels = 1;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
252 } else {
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
253 uint32_t sub_start =filebuf[0x40/2] << 16 | filebuf[0x42/2];
2146
0c0d4233d826 Fix SP end address in disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2132
diff changeset
254 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
255 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
256 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
257 return 1;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
258 }
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
259 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
260 sub_end = boot_size;
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
261 }
2105
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
262 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
263 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
264 {
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
265 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
266 if (offset >= boot_size) {
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
267 break;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
268 }
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
269 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
270 "init",
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
271 "main",
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
272 "int_2"
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
273 };
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
274 char namebuf[32];
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
275 const char *name;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
276 if (index < 3) {
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
277 name = fixed_names[index];
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
278 } else {
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
279 name = namebuf;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
280 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
281 }
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
282 uint32_t address = 0x6000 + offset - sub_start;
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
283 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
284 if (!has_manual_defs || !only) {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
285 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
286 }
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
287 }
2105
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
288
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
289 do_cd_labels = 1;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
290 filebuf += sub_start / 2;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
291 address_off = 0x6000;
1bda10d60b29 Add some enhancements for disassembling Main CPU Sega CD code
Michael Pavone <pavone@retrodev.com>
parents: 2102
diff changeset
292 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
293 }
2091
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
294 }
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
295 }
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
296 if (!vos && !is_scd_iso) {
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
297 if (filebuf) {
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
298 if (filesize > (32*1024)) {
2091
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
299 filebuf = realloc(filebuf, filesize);
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
300 fseek(f, 32*1024, SEEK_SET);
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
301 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
302 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
303 {
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
304 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
305 }
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
306 }
2091
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
307 } else {
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
308 filebuf = malloc(filesize);
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
309 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
310 {
2091
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
311 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
312 }
2091
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
313 }
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
314 address_end = address_off + filesize;
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
315 fclose(f);
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
316 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
317 {
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
318 *cur = (*cur >> 8) | (*cur << 8);
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 if (!address_off) {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
321 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
322 }
2
5df303bf72e6 Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
323 }
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
324 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
325 if (main_cpu) {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
326 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
327 } else {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
328 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
329 }
2085
1ff67ce37085 Add some Sega CD specific enhancements to disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2044
diff changeset
330 }
631
de6f00204fa2 Add support for disassembling VOS program modules
Michael Pavone <pavone@retrodev.com>
parents: 467
diff changeset
331 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
332 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
333 rom_def rom = {
7451f970ee66 Add some weak labels for a few exception vectors in disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2110
diff changeset
334 .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
335 .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
336 .buffer = filebuf
7451f970ee66 Add some weak labels for a few exception vectors in disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2110
diff changeset
337 };
7451f970ee66 Add some weak labels for a few exception vectors in disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2110
diff changeset
338 uint8_t valid_address;
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
339 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
340 do {
2132
7451f970ee66 Add some weak labels for a few exception vectors in disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2110
diff changeset
341 valid_address = 0;
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
342 address = context->deferred->address;
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
343 if (!is_visited(context, address)) {
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
344 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
345 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
346 valid_address = 1;
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
347 address = context->deferred->address;
2091
36a9cf4db65f Fix some disassembler bugs introduced with Sega CD changes
Michael Pavone <pavone@retrodev.com>
parents: 2085
diff changeset
348 }
44
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
349 }
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
350 deferred_addr *tmpd = context->deferred;
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
351 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
352 free(tmpd);
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
353 } 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
354 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
355 break;
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
356 }
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
357 for(;;) {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
358 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
359 break;
0bdda50c7364 Don't try to disassemble addresses beyond the end of the cartridge
Mike Pavone <pavone@retrodev.com>
parents: 47
diff changeset
360 }
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
361 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
362 address = m68k_decode(fetch, &rom, &instbuf, address);
111
8b50d2c975b2 Fix decoding of Scc
Mike Pavone <pavone@retrodev.com>
parents: 103
diff changeset
363 //m68k_disasm(&instbuf, disbuf);
8b50d2c975b2 Fix decoding of Scc
Mike Pavone <pavone@retrodev.com>
parents: 103
diff changeset
364 //printf("%X: %s\n", instbuf.address, disbuf);
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
365 check_reference(context, &instbuf, &(instbuf.src));
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
366 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
367 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
368 break;
164
afbfb0ac0256 Small fix to disassembler
Mike Pavone <pavone@retrodev.com>
parents: 151
diff changeset
369 }
afbfb0ac0256 Small fix to disassembler
Mike Pavone <pavone@retrodev.com>
parents: 151
diff changeset
370 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
371 tmp_addr = instbuf.address + 2 + instbuf.src.params.immed;
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
372 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
373 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
374 address = tmp_addr;
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
375 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
376 break;
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
377 }
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
378 } else {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
379 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
380 }
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
381 } 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
382 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
383 address = instbuf.src.params.immed;
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
384 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
385 break;
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
386 }
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
387 } 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
388 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
389 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
390 break;
e821b6fde0e4 Allow jmp/jsr to follow pc-relative addresses in disassembler
Mike Pavone <pavone@retrodev.com>
parents: 111
diff changeset
391 }
44
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
392 } else {
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
393 break;
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
394 }
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
395 } else if(instbuf.op == M68K_JSR) {
80
7b1e16e981ef Fix bug in disassembler that caused it to disassemble addresses it shouldn't
Mike Pavone <pavone@retrodev.com>
parents: 48
diff changeset
396 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
397 defer_disasm(context, instbuf.src.params.immed);
164
afbfb0ac0256 Small fix to disassembler
Mike Pavone <pavone@retrodev.com>
parents: 151
diff changeset
398 } 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
399 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
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
400 }
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
401 }
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
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 }
134
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
404 if (labels) {
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
405 tern_foreach(context->labels, print_label_def, &rom);
134
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
406 puts("");
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
407 }
633
a759f4e38488 Fix translation of 68K address to buffer location when address_off != 0
Michael Pavone <pavone@retrodev.com>
parents: 632
diff changeset
408 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
409 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
410 m68k_decode(fetch, &rom, &instbuf, address);
134
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
411 if (labels) {
2213
53411df7fc71 More 68K disassembler refactoring and fix Windows build failure
Michael Pavone <pavone@retrodev.com>
parents: 2206
diff changeset
412 m68k_disasm_labels(&instbuf, disbuf, context);
2206
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
413 label_def *label = find_label(context, address);
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
414 if (label) {
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
415 if (label->num_labels) {
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
416 for (int i = 0; i < label->num_labels; i++)
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
417 {
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
418 printf("%s:\n", label->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 } else {
4c265d2f6c88 Minor refactor of 68K disassembler
Michael Pavone <pavone@retrodev.com>
parents: 2146
diff changeset
421 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
422 }
134
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
423 }
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
424 if (addr) {
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
425 printf("\t%s\t;%X\n", disbuf, instbuf.address);
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
426 } else {
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
427 printf("\t%s\n", disbuf);
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
428 }
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
429 } else {
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
430 m68k_disasm(&instbuf, disbuf);
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
431 printf("%X: %s\n", instbuf.address, disbuf);
ab50421b1b7a Improve disassembler
Mike Pavone <pavone@retrodev.com>
parents: 114
diff changeset
432 }
44
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
433 }
ec71370820f2 Add logic for following control flow based on logic in the translator
Mike Pavone <pavone@retrodev.com>
parents: 20
diff changeset
434 }
2
5df303bf72e6 Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
435 return 0;
5df303bf72e6 Improve 68K instruction decoding. Add simple disassembler.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
436 }