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annotate zdis.c @ 1637:95880d947257

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Fix for VRAM byte write order broke VDP FIFO testing ROM results. This change cleans up VRAM writes and fixes the regression while preserving the correct VRAM byte write order
author Michael Pavone <pavone@retrodev.com>
date Sun, 11 Nov 2018 22:39:29 -0800
parents 137dbd05ceab
children 92dc3e24f309
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
467
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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 "z80inst.h"
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <stdarg.h>
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10
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11 uint8_t visited[(64*1024)/8];
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12 uint8_t label[(64*1024)/8];
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13
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14 void fatal_error(char *format, ...)
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15 {
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16 va_list args;
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17 va_start(args, format);
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18 vfprintf(stderr, format, args);
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19 va_end(args);
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20 exit(1);
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21 }
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22
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23 void visit(uint16_t address)
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24 {
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25 visited[address/8] |= 1 << (address % 8);
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26 }
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27
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28 void reference(uint16_t address)
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29 {
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30 //printf("referenced: %X\n", address);
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31 label[address/8] |= 1 << (address % 8);
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32 }
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33
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34 uint8_t is_visited(uint16_t address)
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35 {
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36 return visited[address/8] & (1 << (address % 8));
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37 }
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38
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39 uint8_t is_label(uint16_t address)
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40 {
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41 return label[address/8] & (1 << (address % 8));
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42 }
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43
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44 typedef struct deferred {
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45 uint16_t address;
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46 struct deferred *next;
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47 } deferred;
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48
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49 deferred * defer(uint16_t address, deferred * next)
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50 {
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51 if (is_visited(address)) {
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52 return next;
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53 }
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54 //printf("deferring %X\n", address);
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55 deferred * d = malloc(sizeof(deferred));
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56 d->address = address;
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57 d->next = next;
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58 return d;
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59 }
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60
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61 uint8_t labels = 0;
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62 uint8_t addr = 0;
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63 uint8_t only = 0;
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64
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65 int main(int argc, char ** argv)
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66 {
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67 long filesize;
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68 uint8_t *filebuf;
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69 char disbuf[1024];
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70 z80inst instbuf;
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71 uint8_t * cur;
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72 FILE * f = fopen(argv[1], "rb");
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73 fseek(f, 0, SEEK_END);
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74 filesize = ftell(f);
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75 fseek(f, 0, SEEK_SET);
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76 filebuf = malloc(filesize);
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77 fread(filebuf, 1, filesize, f);
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78 fclose(f);
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79 deferred *def = NULL, *tmpd;
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80 uint16_t offset = 0;
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81 for(uint8_t opt = 2; opt < argc; ++opt) {
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82 if (argv[opt][0] == '-') {
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83 FILE * address_log;
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84 switch (argv[opt][1])
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85 {
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86 case 'l':
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87 labels = 1;
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88 break;
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89 case 'a':
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90 addr = 1;
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91 break;
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92 case 'o':
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93 only = 1;
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94 break;
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95 case 'f':
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96 opt++;
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97 if (opt >= argc) {
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98 fputs("-f must be followed by a filename\n", stderr);
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99 exit(1);
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100 }
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101 address_log = fopen(argv[opt], "r");
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102 if (!address_log) {
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103 fprintf(stderr, "Failed to open %s for reading\n", argv[opt]);
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104 exit(1);
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105 }
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106 while (fgets(disbuf, sizeof(disbuf), address_log)) {
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107 if (disbuf[0]) {
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108 uint16_t address = strtol(disbuf, NULL, 16);
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109 if (address) {
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110 def = defer(address, def);
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111 reference(address);
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112 }
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113 }
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114 }
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115 fclose(address_log);
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116 break;
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117 case 's':
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118 opt++;
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119 if (opt >= argc) {
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120 fputs("-s must be followed by a start offset in hex\n", stderr);
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121 exit(1);
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122 }
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123 offset = strtol(argv[opt], NULL, 16);
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124 break;
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125 }
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126 } else {
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127 uint16_t address = strtol(argv[opt], NULL, 16);
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128 def = defer(address, def);
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129 reference(address);
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130 }
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131 }
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132 uint16_t start = offset;
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133 uint8_t *encoded, *next;
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134 uint32_t size;
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135 if (!def || !only) {
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136 def = defer(start, def);
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137 }
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138 uint16_t address;
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139 while(def) {
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140 do {
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141 encoded = NULL;
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142 address = def->address;
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143 if (!is_visited(address)) {
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Michael Pavone <pavone@retrodev.com>
parents: 805
diff changeset
144 encoded = filebuf + address - offset;
199
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145 }
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146 tmpd = def;
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parents:
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147 def = def->next;
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parents:
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148 free(tmpd);
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parents:
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149 } while(def && encoded == NULL);
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parents:
diff changeset
150 if (!encoded) {
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parents:
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151 break;
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152 }
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153 for(;;) {
817
e95978c0988c Added a -s paramter for specifying a start offset in the Z80 disassembler
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parents: 805
diff changeset
154 if ((address - offset) > filesize || is_visited(address) || address < offset) {
199
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parents:
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155 break;
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parents:
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156 }
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parents:
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157 visit(address);
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parents:
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158 next = z80_decode(encoded, &instbuf);
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159 address += (next-encoded);
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160 encoded = next;
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161
258
852b8765bba6 Fix infinite loop in Z80 disassembler
Mike Pavone <pavone@retrodev.com>
parents: 199
diff changeset
162 //z80_disasm(&instbuf, disbuf);
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parents: 199
diff changeset
163 //printf("%X: %s\n", address, disbuf);
199
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parents:
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164 switch (instbuf.op)
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parents:
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165 {
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166 case Z80_JR:
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parents:
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167 address += instbuf.immed;
817
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parents: 805
diff changeset
168 encoded = filebuf + address - offset;
199
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parents:
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169 break;
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parents:
diff changeset
170 case Z80_JRCC:
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Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
171 reference(address + instbuf.immed);
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parents:
diff changeset
172 def = defer(address + instbuf.immed, def);
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Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
173 break;
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Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
174 case Z80_JP:
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parents:
diff changeset
175 address = instbuf.immed;
817
e95978c0988c Added a -s paramter for specifying a start offset in the Z80 disassembler
Michael Pavone <pavone@retrodev.com>
parents: 805
diff changeset
176 encoded = filebuf + address - offset;
199
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parents:
diff changeset
177 break;
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Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
178 case Z80_JPCC:
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parents:
diff changeset
179 case Z80_CALL:
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parents:
diff changeset
180 case Z80_CALLCC:
313
a13329645ea3 Fix terminal instruction detection in disassembler
Mike Pavone <pavone@retrodev.com>
parents: 258
diff changeset
181 case Z80_RST:
199
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parents:
diff changeset
182 reference(instbuf.immed);
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parents:
diff changeset
183 def = defer(instbuf.immed, def);
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Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
184 break;
313
a13329645ea3 Fix terminal instruction detection in disassembler
Mike Pavone <pavone@retrodev.com>
parents: 258
diff changeset
185 default:
a13329645ea3 Fix terminal instruction detection in disassembler
Mike Pavone <pavone@retrodev.com>
parents: 258
diff changeset
186 if (z80_is_terminal(&instbuf)) {
a13329645ea3 Fix terminal instruction detection in disassembler
Mike Pavone <pavone@retrodev.com>
parents: 258
diff changeset
187 address = filesize + 1;
a13329645ea3 Fix terminal instruction detection in disassembler
Mike Pavone <pavone@retrodev.com>
parents: 258
diff changeset
188 }
199
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
189 }
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
190 }
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
191 }
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
192 if (labels) {
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
193 for (address = filesize; address < (64*1024); address++) {
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
194 if (is_label(address)) {
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
195 printf("ADR_%X equ $%X\n", address, address);
69585e7d474f Add initial stab at Z80 decoder and disassembler
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parents:
diff changeset
196 }
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
197 }
69585e7d474f Add initial stab at Z80 decoder and disassembler
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parents:
diff changeset
198 puts("");
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
199 }
818
a634ed0a92cf Small fix to start offset support in Z80 disassembler
Michael Pavone <pavone@retrodev.com>
parents: 817
diff changeset
200 for (address = offset; address < filesize + offset; address++) {
199
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
201 if (is_visited(address)) {
817
e95978c0988c Added a -s paramter for specifying a start offset in the Z80 disassembler
Michael Pavone <pavone@retrodev.com>
parents: 805
diff changeset
202 encoded = filebuf + address - offset;
199
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
203 z80_decode(encoded, &instbuf);
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
204 if (labels) {
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
205 /*m68k_disasm_labels(&instbuf, disbuf);
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
206 if (is_label(instbuf.address)) {
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
207 printf("ADR_%X:\n", instbuf.address);
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
208 }
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
209 if (addr) {
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
210 printf("\t%s\t;%X\n", disbuf, instbuf.address);
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
211 } else {
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
212 printf("\t%s\n", disbuf);
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
213 }*/
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
214 } else {
314
54c0e5f22198 Show absolute addresses for JR, JRCC and DJNZ in Z80 disassembler
Mike Pavone <pavone@retrodev.com>
parents: 313
diff changeset
215 z80_disasm(&instbuf, disbuf, address);
199
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
216 printf("%X: %s\n", address, disbuf);
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
217 }
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
218 }
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
219 }
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
220 return 0;
69585e7d474f Add initial stab at Z80 decoder and disassembler
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
221 }