| 1 |
/* |
| 2 |
* mon.cpp - mon main program |
| 3 |
* |
| 4 |
* mon (C) 1997-2000 Christian Bauer, Marc Hellwig |
| 5 |
* |
| 6 |
* This program is free software; you can redistribute it and/or modify |
| 7 |
* it under the terms of the GNU General Public License as published by |
| 8 |
* the Free Software Foundation; either version 2 of the License, or |
| 9 |
* (at your option) any later version. |
| 10 |
* |
| 11 |
* This program is distributed in the hope that it will be useful, |
| 12 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
* GNU General Public License for more details. |
| 15 |
* |
| 16 |
* You should have received a copy of the GNU General Public License |
| 17 |
* along with this program; if not, write to the Free Software |
| 18 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 |
*/ |
| 20 |
|
| 21 |
#include "sysdeps.h" |
| 22 |
|
| 23 |
#include <stdio.h> |
| 24 |
#include <stdlib.h> |
| 25 |
#include <signal.h> |
| 26 |
#include <ctype.h> |
| 27 |
|
| 28 |
#if defined(HAVE_READLINE_H) |
| 29 |
extern "C" { |
| 30 |
#include <readline.h> |
| 31 |
} |
| 32 |
#elif defined(HAVE_READLINE_READLINE_H) |
| 33 |
extern "C" { |
| 34 |
#include <readline/readline.h> |
| 35 |
} |
| 36 |
#endif |
| 37 |
|
| 38 |
#if defined(HAVE_HISTORY_H) |
| 39 |
extern "C" { |
| 40 |
#include <history.h> |
| 41 |
} |
| 42 |
#elif defined(HAVE_READLINE_HISTORY_H) |
| 43 |
extern "C" { |
| 44 |
#include <readline/history.h> |
| 45 |
} |
| 46 |
#endif |
| 47 |
|
| 48 |
#include "mon.h" |
| 49 |
#include "mon_cmd.h" |
| 50 |
|
| 51 |
#ifndef VERSION |
| 52 |
#define VERSION "2" |
| 53 |
#endif |
| 54 |
|
| 55 |
|
| 56 |
// Buffer we're operating on |
| 57 |
bool mon_use_real_mem = false; |
| 58 |
uint32 mon_mem_size; |
| 59 |
static uint8 *mem; |
| 60 |
|
| 61 |
|
| 62 |
// Streams for input, output and error messages |
| 63 |
FILE *monin, *monout, *monerr; |
| 64 |
|
| 65 |
// Input line |
| 66 |
static char input[INPUT_LENGTH]; |
| 67 |
static char *in_ptr; |
| 68 |
char *mon_args_ptr; |
| 69 |
|
| 70 |
// Current address, value of '.' in expressions |
| 71 |
uint32 mon_dot_address; |
| 72 |
|
| 73 |
// Current value of ':' in expression |
| 74 |
static uint32 colon_value; |
| 75 |
|
| 76 |
|
| 77 |
// Scanner variables |
| 78 |
enum Token mon_token; // Last token read |
| 79 |
uint32 mon_number; // Contains the number if mon_token==T_NUMBER |
| 80 |
char mon_string[INPUT_LENGTH]; // Contains the string if mon_token==T_STRING |
| 81 |
char mon_name[INPUT_LENGTH]; // Contains the variable name if mon_token==T_NAME |
| 82 |
|
| 83 |
|
| 84 |
// List of installed commands |
| 85 |
struct CmdSpec { |
| 86 |
const char *name; // Name of command |
| 87 |
void (*func)(void); // Function that executes this command |
| 88 |
}; |
| 89 |
|
| 90 |
static CmdSpec *cmds; // Array of CmdSpecs |
| 91 |
static int num_cmds; // Number of installed commands |
| 92 |
static char *cmd_help; // Help text for commands |
| 93 |
|
| 94 |
|
| 95 |
// List of variables |
| 96 |
struct Variable { |
| 97 |
Variable *next; // Pointer to next variable (must be first element of struct) |
| 98 |
char *name; // Variable name |
| 99 |
uint32 value; // Variable value |
| 100 |
}; |
| 101 |
|
| 102 |
static Variable *first_var; // Pointer to first variable |
| 103 |
|
| 104 |
|
| 105 |
// Prototypes |
| 106 |
static void init_abort(void); |
| 107 |
static void exit_abort(void); |
| 108 |
|
| 109 |
static void read_line(char *prompt); // Scanner |
| 110 |
static char get_char(void); |
| 111 |
static void put_back(char c); |
| 112 |
static enum Token get_hex_number(uint32 &i); |
| 113 |
static enum Token get_dec_number(uint32 &i); |
| 114 |
static enum Token get_char_number(uint32 &i); |
| 115 |
static enum Token get_string(char *str); |
| 116 |
static enum Token get_hex_or_name(uint32 &i, char *name); |
| 117 |
|
| 118 |
static bool eor_expr(uint32 *number); // Parser |
| 119 |
static bool and_expr(uint32 *number); |
| 120 |
static bool shift_expr(uint32 *number); |
| 121 |
static bool add_expr(uint32 *number); |
| 122 |
static bool mul_expr(uint32 *number); |
| 123 |
static bool factor(uint32 *number); |
| 124 |
static Variable *lookup_var(const char *s); |
| 125 |
static Variable *insert_var(const char *s); |
| 126 |
static void remove_var(const char *s); |
| 127 |
|
| 128 |
|
| 129 |
/* |
| 130 |
* Add command to mon |
| 131 |
*/ |
| 132 |
|
| 133 |
void mon_add_command(const char *name, void (*func)(void), const char *help_text) |
| 134 |
{ |
| 135 |
num_cmds++; |
| 136 |
if (cmds) |
| 137 |
cmds = (CmdSpec *)realloc(cmds, num_cmds * sizeof(CmdSpec)); |
| 138 |
else |
| 139 |
cmds = (CmdSpec *)malloc(sizeof(CmdSpec)); |
| 140 |
cmds[num_cmds - 1].name = name; |
| 141 |
cmds[num_cmds - 1].func = func; |
| 142 |
if (help_text) { |
| 143 |
if (cmd_help) { |
| 144 |
cmd_help = (char *)realloc(cmd_help, strlen(cmd_help) + strlen(help_text) + 1); |
| 145 |
strcat(cmd_help, help_text); |
| 146 |
} else |
| 147 |
cmd_help = strdup(help_text); |
| 148 |
} |
| 149 |
} |
| 150 |
|
| 151 |
|
| 152 |
/* |
| 153 |
* Print error message |
| 154 |
*/ |
| 155 |
|
| 156 |
void mon_error(const char *s) |
| 157 |
{ |
| 158 |
fprintf(monerr, "*** %s\n", s); |
| 159 |
} |
| 160 |
|
| 161 |
|
| 162 |
/* |
| 163 |
* CTRL-C pressed? |
| 164 |
*/ |
| 165 |
|
| 166 |
static bool was_aborted; |
| 167 |
static struct sigaction my_sa; |
| 168 |
|
| 169 |
#ifdef __BEOS__ |
| 170 |
static void handle_abort(int sig, void *arg, vregs *r) |
| 171 |
#else |
| 172 |
static void handle_abort(int sig) |
| 173 |
#endif |
| 174 |
{ |
| 175 |
was_aborted = true; |
| 176 |
} |
| 177 |
|
| 178 |
static void init_abort(void) |
| 179 |
{ |
| 180 |
was_aborted = false; |
| 181 |
sigemptyset(&my_sa.sa_mask); |
| 182 |
#ifdef __BEOS__ |
| 183 |
my_sa.sa_handler = (__signal_func_ptr)handle_abort; |
| 184 |
my_sa.sa_userdata = 0; |
| 185 |
#else |
| 186 |
my_sa.sa_handler = handle_abort; |
| 187 |
#endif |
| 188 |
my_sa.sa_flags = 0; |
| 189 |
sigaction(SIGINT, &my_sa, NULL); |
| 190 |
} |
| 191 |
|
| 192 |
static void exit_abort(void) |
| 193 |
{ |
| 194 |
my_sa.sa_handler = SIG_DFL; |
| 195 |
sigaction(SIGINT, &my_sa, NULL); |
| 196 |
} |
| 197 |
|
| 198 |
bool mon_aborted(void) |
| 199 |
{ |
| 200 |
bool ret = was_aborted; |
| 201 |
was_aborted = false; |
| 202 |
return ret; |
| 203 |
} |
| 204 |
|
| 205 |
|
| 206 |
/* |
| 207 |
* Access to buffer |
| 208 |
*/ |
| 209 |
|
| 210 |
uint32 (*mon_read_byte)(uint32 adr); |
| 211 |
|
| 212 |
uint32 mon_read_byte_buffer(uint32 adr) |
| 213 |
{ |
| 214 |
return mem[adr % mon_mem_size]; |
| 215 |
} |
| 216 |
|
| 217 |
uint32 mon_read_byte_real(uint32 adr) |
| 218 |
{ |
| 219 |
return *(uint8 *)adr; |
| 220 |
} |
| 221 |
|
| 222 |
void (*mon_write_byte)(uint32 adr, uint32 b); |
| 223 |
|
| 224 |
void mon_write_byte_buffer(uint32 adr, uint32 b) |
| 225 |
{ |
| 226 |
mem[adr % mon_mem_size] = b; |
| 227 |
} |
| 228 |
|
| 229 |
void mon_write_byte_real(uint32 adr, uint32 b) |
| 230 |
{ |
| 231 |
*(uint8 *)adr = b; |
| 232 |
} |
| 233 |
|
| 234 |
uint32 mon_read_half(uint32 adr) |
| 235 |
{ |
| 236 |
return (mon_read_byte(adr) << 8) | mon_read_byte(adr+1); |
| 237 |
} |
| 238 |
|
| 239 |
void mon_write_half(uint32 adr, uint32 w) |
| 240 |
{ |
| 241 |
mon_write_byte(adr, w >> 8); |
| 242 |
mon_write_byte(adr+1, w); |
| 243 |
} |
| 244 |
|
| 245 |
uint32 mon_read_word(uint32 adr) |
| 246 |
{ |
| 247 |
return (mon_read_byte(adr) << 24) | (mon_read_byte(adr+1) << 16) | (mon_read_byte(adr+2) << 8) | mon_read_byte(adr+3); |
| 248 |
} |
| 249 |
|
| 250 |
void mon_write_word(uint32 adr, uint32 l) |
| 251 |
{ |
| 252 |
mon_write_byte(adr, l >> 24); |
| 253 |
mon_write_byte(adr+1, l >> 16); |
| 254 |
mon_write_byte(adr+2, l >> 8); |
| 255 |
mon_write_byte(adr+3, l); |
| 256 |
} |
| 257 |
|
| 258 |
|
| 259 |
/* |
| 260 |
* Read a line from the keyboard |
| 261 |
*/ |
| 262 |
|
| 263 |
static void read_line(char *prompt) |
| 264 |
{ |
| 265 |
#ifdef HAVE_LIBREADLINE |
| 266 |
static char *line_read = NULL; |
| 267 |
|
| 268 |
if (line_read) { |
| 269 |
free(line_read); |
| 270 |
line_read = NULL; |
| 271 |
} |
| 272 |
|
| 273 |
line_read = readline(prompt); |
| 274 |
|
| 275 |
if (line_read && *line_read) |
| 276 |
add_history(line_read); |
| 277 |
|
| 278 |
strncpy(in_ptr = input, line_read, INPUT_LENGTH); |
| 279 |
input[INPUT_LENGTH-1] = 0; |
| 280 |
#else |
| 281 |
fprintf(monout, prompt); |
| 282 |
fflush(monout); |
| 283 |
fgets(in_ptr = input, INPUT_LENGTH, monin); |
| 284 |
char *s = strchr(input, '\n'); |
| 285 |
if (s != NULL) |
| 286 |
*s = 0; |
| 287 |
#endif |
| 288 |
} |
| 289 |
|
| 290 |
|
| 291 |
/* |
| 292 |
* Read a character from the input line |
| 293 |
*/ |
| 294 |
|
| 295 |
static char get_char(void) |
| 296 |
{ |
| 297 |
return *in_ptr++; |
| 298 |
} |
| 299 |
|
| 300 |
|
| 301 |
/* |
| 302 |
* Stuff back a character into the input line |
| 303 |
*/ |
| 304 |
|
| 305 |
static void put_back(char c) |
| 306 |
{ |
| 307 |
*(--in_ptr) = c; |
| 308 |
} |
| 309 |
|
| 310 |
|
| 311 |
/* |
| 312 |
* Scanner: Get a token from the input line |
| 313 |
*/ |
| 314 |
|
| 315 |
enum Token mon_get_token(void) |
| 316 |
{ |
| 317 |
char c; |
| 318 |
|
| 319 |
// Skip spaces |
| 320 |
while ((c = get_char()) == ' ') ; |
| 321 |
|
| 322 |
switch (c) { |
| 323 |
case 0: |
| 324 |
return mon_token = T_END; |
| 325 |
case '(': |
| 326 |
return mon_token = T_LPAREN; |
| 327 |
case ')': |
| 328 |
return mon_token = T_RPAREN; |
| 329 |
case '.': |
| 330 |
return mon_token = T_DOT; |
| 331 |
case ':': |
| 332 |
return mon_token = T_COLON; |
| 333 |
case ',': |
| 334 |
return mon_token = T_COMMA; |
| 335 |
case '+': |
| 336 |
return mon_token = T_PLUS; |
| 337 |
case '-': |
| 338 |
return mon_token = T_MINUS; |
| 339 |
case '*': |
| 340 |
return mon_token = T_MUL; |
| 341 |
case '/': |
| 342 |
return mon_token = T_DIV; |
| 343 |
case '%': |
| 344 |
return mon_token = T_MOD; |
| 345 |
case '&': |
| 346 |
return mon_token = T_AND; |
| 347 |
case '|': |
| 348 |
return mon_token = T_OR; |
| 349 |
case '^': |
| 350 |
return mon_token = T_EOR; |
| 351 |
case '<': |
| 352 |
if (get_char() == '<') |
| 353 |
return mon_token = T_SHIFTL; |
| 354 |
else { |
| 355 |
mon_error("Unrecognized token"); |
| 356 |
return mon_token = T_NULL; |
| 357 |
} |
| 358 |
case '>': |
| 359 |
if (get_char() == '>') |
| 360 |
return mon_token = T_SHIFTR; |
| 361 |
else { |
| 362 |
mon_error("Unrecognized token"); |
| 363 |
return mon_token = T_NULL; |
| 364 |
} |
| 365 |
case '~': |
| 366 |
return mon_token = T_NOT; |
| 367 |
case '=': |
| 368 |
return mon_token = T_ASSIGN; |
| 369 |
|
| 370 |
case '$': |
| 371 |
if ((mon_token = get_hex_number(mon_number)) == T_NULL) |
| 372 |
mon_error("'$' must be followed by hexadecimal number"); |
| 373 |
return mon_token; |
| 374 |
case '_': |
| 375 |
if ((mon_token = get_dec_number(mon_number)) == T_NULL) |
| 376 |
mon_error("'_' must be followed by decimal number"); |
| 377 |
return mon_token; |
| 378 |
case '\'': |
| 379 |
return mon_token = get_char_number(mon_number); |
| 380 |
case '"': |
| 381 |
return mon_token = get_string(mon_string); |
| 382 |
|
| 383 |
default: |
| 384 |
if (isalnum(c)) { |
| 385 |
put_back(c); |
| 386 |
return mon_token = get_hex_or_name(mon_number, mon_name); |
| 387 |
} |
| 388 |
mon_error("Unrecognized token"); |
| 389 |
return mon_token = T_NULL; |
| 390 |
} |
| 391 |
} |
| 392 |
|
| 393 |
static enum Token get_hex_number(uint32 &i) |
| 394 |
{ |
| 395 |
char c = get_char(); |
| 396 |
|
| 397 |
i = 0; |
| 398 |
if (!isxdigit(c)) |
| 399 |
return T_NULL; |
| 400 |
|
| 401 |
do { |
| 402 |
if (c < 'a') |
| 403 |
i = (i << 4) + (c - '0'); |
| 404 |
else |
| 405 |
i = (i << 4) + (c - 'a' + 10); |
| 406 |
c = get_char(); |
| 407 |
} while (isxdigit(c)); |
| 408 |
|
| 409 |
if (isalnum(c)) |
| 410 |
return T_NULL; |
| 411 |
else { |
| 412 |
put_back(c); |
| 413 |
return T_NUMBER; |
| 414 |
} |
| 415 |
} |
| 416 |
|
| 417 |
static enum Token get_dec_number(uint32 &i) |
| 418 |
{ |
| 419 |
char c = get_char(); |
| 420 |
|
| 421 |
i = 0; |
| 422 |
if (!isdigit(c)) |
| 423 |
return T_NULL; |
| 424 |
|
| 425 |
do { |
| 426 |
i = (i * 10) + (c - '0'); |
| 427 |
c = get_char(); |
| 428 |
} while (isdigit(c)); |
| 429 |
|
| 430 |
if (isalnum(c)) |
| 431 |
return T_NULL; |
| 432 |
else { |
| 433 |
put_back(c); |
| 434 |
return T_NUMBER; |
| 435 |
} |
| 436 |
} |
| 437 |
|
| 438 |
static enum Token get_char_number(uint32 &i) |
| 439 |
{ |
| 440 |
char c; |
| 441 |
|
| 442 |
i = 0; |
| 443 |
while ((c = get_char()) != 0) { |
| 444 |
if (c == '\'') |
| 445 |
return T_NUMBER; |
| 446 |
i = (i << 8) + (uint8)c; |
| 447 |
} |
| 448 |
|
| 449 |
mon_error("Unterminated character constant"); |
| 450 |
return T_NULL; |
| 451 |
} |
| 452 |
|
| 453 |
static enum Token get_string(char *str) |
| 454 |
{ |
| 455 |
char c; |
| 456 |
|
| 457 |
while ((c = get_char()) != 0) { |
| 458 |
if (c == '"') { |
| 459 |
*str = 0; |
| 460 |
return T_STRING; |
| 461 |
} |
| 462 |
*str++ = c; |
| 463 |
} |
| 464 |
|
| 465 |
mon_error("Unterminated string"); |
| 466 |
return T_NULL; |
| 467 |
} |
| 468 |
|
| 469 |
static enum Token get_hex_or_name(uint32 &i, char *name) |
| 470 |
{ |
| 471 |
char *old_in_ptr = in_ptr; |
| 472 |
char c; |
| 473 |
|
| 474 |
// Try hex number first |
| 475 |
if (get_hex_number(i) == T_NUMBER) |
| 476 |
return T_NUMBER; |
| 477 |
|
| 478 |
// Not a hex number, must be a variable name |
| 479 |
in_ptr = old_in_ptr; |
| 480 |
c = get_char(); |
| 481 |
do { |
| 482 |
*name++ = c; |
| 483 |
c = get_char(); |
| 484 |
} while (isalnum(c)); |
| 485 |
|
| 486 |
*name = 0; |
| 487 |
put_back(c); |
| 488 |
return T_NAME; |
| 489 |
} |
| 490 |
|
| 491 |
|
| 492 |
/* |
| 493 |
* expression = eor_expr {OR eor_expr} |
| 494 |
* true: OK, false: Error |
| 495 |
*/ |
| 496 |
|
| 497 |
bool mon_expression(uint32 *number) |
| 498 |
{ |
| 499 |
uint32 accu, expr; |
| 500 |
|
| 501 |
if (!eor_expr(&accu)) |
| 502 |
return false; |
| 503 |
|
| 504 |
for (;;) |
| 505 |
switch (mon_token) { |
| 506 |
case T_OR: |
| 507 |
mon_get_token(); |
| 508 |
if (!eor_expr(&expr)) |
| 509 |
return false; |
| 510 |
accu |= expr; |
| 511 |
break; |
| 512 |
|
| 513 |
default: |
| 514 |
*number = accu; |
| 515 |
return true; |
| 516 |
} |
| 517 |
} |
| 518 |
|
| 519 |
|
| 520 |
/* |
| 521 |
* eor_expr = and_expr {EOR and_expr} |
| 522 |
* true: OK, false: Error |
| 523 |
*/ |
| 524 |
|
| 525 |
static bool eor_expr(uint32 *number) |
| 526 |
{ |
| 527 |
uint32 accu, expr; |
| 528 |
|
| 529 |
if (!and_expr(&accu)) |
| 530 |
return false; |
| 531 |
|
| 532 |
for (;;) |
| 533 |
switch (mon_token) { |
| 534 |
case T_EOR: |
| 535 |
mon_get_token(); |
| 536 |
if (!and_expr(&expr)) |
| 537 |
return false; |
| 538 |
accu ^= expr; |
| 539 |
break; |
| 540 |
|
| 541 |
default: |
| 542 |
*number = accu; |
| 543 |
return true; |
| 544 |
} |
| 545 |
} |
| 546 |
|
| 547 |
|
| 548 |
/* |
| 549 |
* and_expr = shift_expr {AND shift_expr} |
| 550 |
* true: OK, false: Error |
| 551 |
*/ |
| 552 |
|
| 553 |
static bool and_expr(uint32 *number) |
| 554 |
{ |
| 555 |
uint32 accu, expr; |
| 556 |
|
| 557 |
if (!shift_expr(&accu)) |
| 558 |
return false; |
| 559 |
|
| 560 |
for (;;) |
| 561 |
switch (mon_token) { |
| 562 |
case T_AND: |
| 563 |
mon_get_token(); |
| 564 |
if (!shift_expr(&expr)) |
| 565 |
return false; |
| 566 |
accu &= expr; |
| 567 |
break; |
| 568 |
|
| 569 |
default: |
| 570 |
*number = accu; |
| 571 |
return true; |
| 572 |
} |
| 573 |
} |
| 574 |
|
| 575 |
|
| 576 |
/* |
| 577 |
* shift_expr = add_expr {(SHIFTL | SHIFTR) add_expr} |
| 578 |
* true: OK, false: Error |
| 579 |
*/ |
| 580 |
|
| 581 |
static bool shift_expr(uint32 *number) |
| 582 |
{ |
| 583 |
uint32 accu, expr; |
| 584 |
|
| 585 |
if (!add_expr(&accu)) |
| 586 |
return false; |
| 587 |
|
| 588 |
for (;;) |
| 589 |
switch (mon_token) { |
| 590 |
case T_SHIFTL: |
| 591 |
mon_get_token(); |
| 592 |
if (!add_expr(&expr)) |
| 593 |
return false; |
| 594 |
accu <<= expr; |
| 595 |
break; |
| 596 |
|
| 597 |
case T_SHIFTR: |
| 598 |
mon_get_token(); |
| 599 |
if (!add_expr(&expr)) |
| 600 |
return false; |
| 601 |
accu >>= expr; |
| 602 |
break; |
| 603 |
|
| 604 |
default: |
| 605 |
*number = accu; |
| 606 |
return true; |
| 607 |
} |
| 608 |
} |
| 609 |
|
| 610 |
|
| 611 |
/* |
| 612 |
* add_expr = mul_expr {(PLUS | MINUS) mul_expr} |
| 613 |
* true: OK, false: Error |
| 614 |
*/ |
| 615 |
|
| 616 |
static bool add_expr(uint32 *number) |
| 617 |
{ |
| 618 |
uint32 accu, expr; |
| 619 |
|
| 620 |
if (!mul_expr(&accu)) |
| 621 |
return false; |
| 622 |
|
| 623 |
for (;;) |
| 624 |
switch (mon_token) { |
| 625 |
case T_PLUS: |
| 626 |
mon_get_token(); |
| 627 |
if (!mul_expr(&expr)) |
| 628 |
return false; |
| 629 |
accu += expr; |
| 630 |
break; |
| 631 |
|
| 632 |
case T_MINUS: |
| 633 |
mon_get_token(); |
| 634 |
if (!mul_expr(&expr)) |
| 635 |
return false; |
| 636 |
accu -= expr; |
| 637 |
break; |
| 638 |
|
| 639 |
default: |
| 640 |
*number = accu; |
| 641 |
return true; |
| 642 |
} |
| 643 |
} |
| 644 |
|
| 645 |
|
| 646 |
/* |
| 647 |
* mul_expr = factor {(MUL | DIV | MOD) factor} |
| 648 |
* true: OK, false: Error |
| 649 |
*/ |
| 650 |
|
| 651 |
static bool mul_expr(uint32 *number) |
| 652 |
{ |
| 653 |
uint32 accu, fact; |
| 654 |
|
| 655 |
if (!factor(&accu)) |
| 656 |
return false; |
| 657 |
|
| 658 |
for (;;) |
| 659 |
switch (mon_token) { |
| 660 |
case T_MUL: |
| 661 |
mon_get_token(); |
| 662 |
if (!factor(&fact)) |
| 663 |
return false; |
| 664 |
accu *= fact; |
| 665 |
break; |
| 666 |
|
| 667 |
case T_DIV: |
| 668 |
mon_get_token(); |
| 669 |
if (!factor(&fact)) |
| 670 |
return false; |
| 671 |
if (fact == 0) { |
| 672 |
mon_error("Division by 0"); |
| 673 |
return false; |
| 674 |
} |
| 675 |
accu /= fact; |
| 676 |
break; |
| 677 |
|
| 678 |
case T_MOD: |
| 679 |
mon_get_token(); |
| 680 |
if (!factor(&fact)) |
| 681 |
return false; |
| 682 |
if (fact == 0) { |
| 683 |
mon_error("Division by 0"); |
| 684 |
return false; |
| 685 |
} |
| 686 |
accu %= fact; |
| 687 |
break; |
| 688 |
|
| 689 |
default: |
| 690 |
*number = accu; |
| 691 |
return true; |
| 692 |
} |
| 693 |
} |
| 694 |
|
| 695 |
|
| 696 |
/* |
| 697 |
* factor = NUMBER | NAME | DOT | COLON | (PLUS | MINUS | NOT) factor | LPAREN expression RPAREN |
| 698 |
* true: OK, false: Error |
| 699 |
*/ |
| 700 |
|
| 701 |
static bool factor(uint32 *number) |
| 702 |
{ |
| 703 |
switch (mon_token) { |
| 704 |
case T_NUMBER: |
| 705 |
*number = mon_number; |
| 706 |
mon_get_token(); |
| 707 |
return true; |
| 708 |
|
| 709 |
case T_NAME:{ |
| 710 |
Variable *var; |
| 711 |
if ((var = lookup_var(mon_name)) != NULL) { |
| 712 |
*number = var->value; |
| 713 |
mon_get_token(); |
| 714 |
return true; |
| 715 |
} else |
| 716 |
return false; |
| 717 |
} |
| 718 |
|
| 719 |
case T_DOT: |
| 720 |
*number = mon_dot_address; |
| 721 |
mon_get_token(); |
| 722 |
return true; |
| 723 |
|
| 724 |
case T_COLON: |
| 725 |
*number = colon_value; |
| 726 |
mon_get_token(); |
| 727 |
return true; |
| 728 |
|
| 729 |
case T_PLUS: |
| 730 |
mon_get_token(); |
| 731 |
return factor(number); |
| 732 |
|
| 733 |
case T_MINUS: |
| 734 |
mon_get_token(); |
| 735 |
if (factor(number)) { |
| 736 |
*number = -*number; |
| 737 |
return true; |
| 738 |
} else |
| 739 |
return false; |
| 740 |
|
| 741 |
case T_NOT: |
| 742 |
mon_get_token(); |
| 743 |
if (factor(number)) { |
| 744 |
*number = ~*number; |
| 745 |
return true; |
| 746 |
} else |
| 747 |
return false; |
| 748 |
|
| 749 |
case T_LPAREN: |
| 750 |
mon_get_token(); |
| 751 |
if (mon_expression(number)) |
| 752 |
if (mon_token == T_RPAREN) { |
| 753 |
mon_get_token(); |
| 754 |
return true; |
| 755 |
} else { |
| 756 |
mon_error("Missing ')'"); |
| 757 |
return false; |
| 758 |
} |
| 759 |
else { |
| 760 |
mon_error("Error in expression"); |
| 761 |
return false; |
| 762 |
} |
| 763 |
|
| 764 |
case T_END: |
| 765 |
mon_error("Required argument missing"); |
| 766 |
return false; |
| 767 |
|
| 768 |
default: |
| 769 |
mon_error("'(' or number expected"); |
| 770 |
return false; |
| 771 |
} |
| 772 |
} |
| 773 |
|
| 774 |
|
| 775 |
/* |
| 776 |
* Lookup the value of a variable |
| 777 |
*/ |
| 778 |
|
| 779 |
static Variable *lookup_var(const char *s) |
| 780 |
{ |
| 781 |
// Lookup variable |
| 782 |
for (Variable *var=first_var; var; var=var->next) |
| 783 |
if (!strcmp(s, var->name)) |
| 784 |
return var; |
| 785 |
|
| 786 |
// Not found, error |
| 787 |
mon_error("Undefined variable"); |
| 788 |
return NULL; |
| 789 |
} |
| 790 |
|
| 791 |
|
| 792 |
/* |
| 793 |
* Insert new variable (or redefine old) |
| 794 |
*/ |
| 795 |
|
| 796 |
static Variable *insert_var(const char *s) |
| 797 |
{ |
| 798 |
// Lookup variable |
| 799 |
for (Variable *var=first_var; var; var=var->next) |
| 800 |
if (!strcmp(s, var->name)) |
| 801 |
return var; |
| 802 |
|
| 803 |
// Insert new variable |
| 804 |
Variable *var = new Variable; |
| 805 |
var->name = strdup(s); |
| 806 |
var->next = first_var; |
| 807 |
first_var = var; |
| 808 |
return var; |
| 809 |
} |
| 810 |
|
| 811 |
|
| 812 |
/* |
| 813 |
* Remove variable |
| 814 |
*/ |
| 815 |
|
| 816 |
static void remove_var(const char *s) |
| 817 |
{ |
| 818 |
Variable *var, *prev = (Variable *)&first_var; |
| 819 |
|
| 820 |
// Lookup variable and remove it |
| 821 |
for (var=prev->next; var; prev=var, var=var->next) |
| 822 |
if (!strcmp(s, var->name)) { |
| 823 |
prev->next = var->next; |
| 824 |
free(var->name); |
| 825 |
free(var); |
| 826 |
return; |
| 827 |
} |
| 828 |
} |
| 829 |
|
| 830 |
|
| 831 |
/* |
| 832 |
* Set/clear/show variables |
| 833 |
* set [var[=value]] |
| 834 |
*/ |
| 835 |
|
| 836 |
static void set_var(void) |
| 837 |
{ |
| 838 |
if (mon_token == T_END) { |
| 839 |
|
| 840 |
// Show all variables |
| 841 |
if (first_var == NULL) |
| 842 |
fprintf(monout, "No variables defined\n"); |
| 843 |
else |
| 844 |
for (Variable *v=first_var; v; v=v->next) |
| 845 |
fprintf(monout, "%s = %08x\n", v->name, v->value); |
| 846 |
|
| 847 |
} else if (mon_token == T_NAME) { |
| 848 |
char var_name[256]; |
| 849 |
strcpy(var_name, mon_name); |
| 850 |
mon_get_token(); |
| 851 |
if (mon_token == T_ASSIGN) { |
| 852 |
|
| 853 |
// Set variable |
| 854 |
uint32 value; |
| 855 |
mon_get_token(); |
| 856 |
if (!mon_expression(&value)) |
| 857 |
return; |
| 858 |
if (mon_token != T_END) { |
| 859 |
mon_error("Too many arguments"); |
| 860 |
return; |
| 861 |
} |
| 862 |
insert_var(var_name)->value = value; |
| 863 |
|
| 864 |
} else if (mon_token == T_END) { |
| 865 |
|
| 866 |
// Clear variable |
| 867 |
remove_var(var_name); |
| 868 |
|
| 869 |
} else |
| 870 |
mon_error("'=' expected"); |
| 871 |
} else |
| 872 |
mon_error("Variable name expected"); |
| 873 |
} |
| 874 |
|
| 875 |
|
| 876 |
/* |
| 877 |
* Clear all variables |
| 878 |
* cv |
| 879 |
*/ |
| 880 |
|
| 881 |
static void clear_vars(void) |
| 882 |
{ |
| 883 |
Variable *var, *next; |
| 884 |
for (var=first_var; var; var=next) { |
| 885 |
free(var->name); |
| 886 |
next = var->next; |
| 887 |
free(var); |
| 888 |
} |
| 889 |
first_var = NULL; |
| 890 |
} |
| 891 |
|
| 892 |
|
| 893 |
/* |
| 894 |
* Display help |
| 895 |
* h |
| 896 |
*/ |
| 897 |
|
| 898 |
static void help_or_hunt(void) |
| 899 |
{ |
| 900 |
if (mon_token != T_END) { |
| 901 |
hunt(); |
| 902 |
return; |
| 903 |
} |
| 904 |
fprintf(monout, "x Quit mon\n" |
| 905 |
"h This help text\n"); |
| 906 |
fprintf(monout, cmd_help); |
| 907 |
} |
| 908 |
|
| 909 |
|
| 910 |
/* |
| 911 |
* Display command list |
| 912 |
* ?? |
| 913 |
*/ |
| 914 |
|
| 915 |
static void mon_cmd_list(void) |
| 916 |
{ |
| 917 |
for (int i=0; i<num_cmds; i++) |
| 918 |
fprintf(monout, "%s ", cmds[i].name); |
| 919 |
fprintf(monout, "\n"); |
| 920 |
} |
| 921 |
|
| 922 |
|
| 923 |
/* |
| 924 |
* Reallocate buffer |
| 925 |
* @ [size] |
| 926 |
*/ |
| 927 |
|
| 928 |
static void reallocate(void) |
| 929 |
{ |
| 930 |
uint32 size; |
| 931 |
|
| 932 |
if (mon_use_real_mem) { |
| 933 |
fprintf(monerr, "Cannot reallocate buffer in real mode\n"); |
| 934 |
return; |
| 935 |
} |
| 936 |
|
| 937 |
if (mon_token == T_END) { |
| 938 |
fprintf(monerr, "Buffer size: %08x bytes\n", mon_mem_size); |
| 939 |
return; |
| 940 |
} |
| 941 |
|
| 942 |
if (!mon_expression(&size)) |
| 943 |
return; |
| 944 |
if (mon_token != T_END) { |
| 945 |
mon_error("Too many arguments"); |
| 946 |
return; |
| 947 |
} |
| 948 |
|
| 949 |
if ((mem = (uint8 *)realloc(mem, size)) != NULL) |
| 950 |
fprintf(monerr, "Buffer size: %08x bytes\n", mon_mem_size = size); |
| 951 |
else |
| 952 |
fprintf(monerr, "Unable to reallocate buffer\n"); |
| 953 |
} |
| 954 |
|
| 955 |
|
| 956 |
/* |
| 957 |
* Apply expression to memory |
| 958 |
* y[b|h|w] start end expression |
| 959 |
*/ |
| 960 |
|
| 961 |
static void apply(int size) |
| 962 |
{ |
| 963 |
uint32 adr, end_adr, value; |
| 964 |
char c; |
| 965 |
|
| 966 |
if (!mon_expression(&adr)) |
| 967 |
return; |
| 968 |
if (!mon_expression(&end_adr)) |
| 969 |
return; |
| 970 |
if (!mon_expression(&value)) |
| 971 |
return; |
| 972 |
if (mon_token != T_END) { |
| 973 |
mon_error("Too many arguments"); |
| 974 |
return; |
| 975 |
} |
| 976 |
|
| 977 |
uint32 (*read_func)(uint32 adr); |
| 978 |
void (*write_func)(uint32 adr, uint32 val); |
| 979 |
switch (size) { |
| 980 |
case 1: |
| 981 |
read_func = mon_read_byte; |
| 982 |
write_func = mon_write_byte; |
| 983 |
break; |
| 984 |
case 2: |
| 985 |
read_func = mon_read_half; |
| 986 |
write_func = mon_write_half; |
| 987 |
break; |
| 988 |
case 4: |
| 989 |
read_func = mon_read_word; |
| 990 |
write_func = mon_write_word; |
| 991 |
break; |
| 992 |
default: |
| 993 |
abort(); |
| 994 |
break; |
| 995 |
} |
| 996 |
|
| 997 |
while (adr<=end_adr) { |
| 998 |
colon_value = read_func(adr); |
| 999 |
mon_dot_address = adr; |
| 1000 |
|
| 1001 |
in_ptr = input; |
| 1002 |
while ((c = get_char()) == ' ') ; |
| 1003 |
while ((c = get_char()) != ' ') ; |
| 1004 |
while ((c = get_char()) == ' ') ; |
| 1005 |
put_back(c); |
| 1006 |
mon_get_token(); |
| 1007 |
mon_expression(&value); // Skip start address |
| 1008 |
mon_expression(&value); // Skip end address |
| 1009 |
mon_expression(&value); |
| 1010 |
|
| 1011 |
write_func(adr, value); |
| 1012 |
adr += size; |
| 1013 |
} |
| 1014 |
|
| 1015 |
mon_dot_address = adr; |
| 1016 |
} |
| 1017 |
|
| 1018 |
static void apply_byte(void) |
| 1019 |
{ |
| 1020 |
apply(1); |
| 1021 |
} |
| 1022 |
|
| 1023 |
static void apply_half(void) |
| 1024 |
{ |
| 1025 |
apply(2); |
| 1026 |
} |
| 1027 |
|
| 1028 |
static void apply_word(void) |
| 1029 |
{ |
| 1030 |
apply(4); |
| 1031 |
} |
| 1032 |
|
| 1033 |
|
| 1034 |
/* |
| 1035 |
* Execute command via system() (for ls, rm, etc.) |
| 1036 |
*/ |
| 1037 |
|
| 1038 |
static void mon_exec(void) |
| 1039 |
{ |
| 1040 |
system(input); |
| 1041 |
} |
| 1042 |
|
| 1043 |
|
| 1044 |
/* |
| 1045 |
* Change current directory |
| 1046 |
*/ |
| 1047 |
|
| 1048 |
static void mon_change_dir(void) |
| 1049 |
{ |
| 1050 |
char c; |
| 1051 |
in_ptr = input; |
| 1052 |
while ((c = get_char()) == ' ') ; |
| 1053 |
while ((c = get_char()) != ' ') ; |
| 1054 |
while ((c = get_char()) == ' ') ; |
| 1055 |
put_back(c); |
| 1056 |
if (chdir(in_ptr) != 0) |
| 1057 |
mon_error("Cannot change directory"); |
| 1058 |
} |
| 1059 |
|
| 1060 |
|
| 1061 |
/* |
| 1062 |
* Initialize mon |
| 1063 |
*/ |
| 1064 |
|
| 1065 |
void mon_init(void) |
| 1066 |
{ |
| 1067 |
cmds = NULL; |
| 1068 |
num_cmds = 0; |
| 1069 |
cmd_help = NULL; |
| 1070 |
|
| 1071 |
mon_add_command("??", mon_cmd_list, "?? Show list of commands\n"); |
| 1072 |
mon_add_command("ver", version, "ver Show version\n"); |
| 1073 |
mon_add_command("?", print_expr, "? expression Calculate expression\n"); |
| 1074 |
mon_add_command("@", reallocate, "@ [size] Reallocate buffer\n"); |
| 1075 |
mon_add_command("i", ascii_dump, "i [start [end]] ASCII memory dump\n"); |
| 1076 |
mon_add_command("m", memory_dump, "m [start [end]] Hex/ASCII memory dump\n"); |
| 1077 |
mon_add_command("b", binary_dump, "b [start [end]] Binary memory dump\n"); |
| 1078 |
mon_add_command("d", disassemble_ppc, "d [start [end]] Disassemble PowerPC code\n"); |
| 1079 |
mon_add_command("d65", disassemble_6502, "d65 [start [end]] Disassemble 6502 code\n"); |
| 1080 |
mon_add_command("d68", disassemble_680x0, "d68 [start [end]] Disassemble 680x0 code\n"); |
| 1081 |
mon_add_command("d80", disassemble_8080, "d80 [start [end]] Disassemble 8080 code\n"); |
| 1082 |
mon_add_command("d86", disassemble_80x86, "d86 [start [end]] Disassemble 80x86 code\n"); |
| 1083 |
mon_add_command(":", modify, ": start string Modify memory\n"); |
| 1084 |
mon_add_command("f", fill, "f start end string Fill memory\n"); |
| 1085 |
mon_add_command("y", apply_byte, "y[b|h|w] start end expr Apply expression to memory\n"); |
| 1086 |
mon_add_command("yb", apply_byte, NULL); |
| 1087 |
mon_add_command("yh", apply_half, NULL); |
| 1088 |
mon_add_command("yw", apply_word, NULL); |
| 1089 |
mon_add_command("t", transfer, "t start end dest Transfer memory\n"); |
| 1090 |
mon_add_command("c", compare, "c start end dest Compare memory\n"); |
| 1091 |
mon_add_command("h", help_or_hunt, "h start end string Search for byte string\n"); |
| 1092 |
mon_add_command("\\", shell_command, "\\ \"command\" Execute shell command\n"); |
| 1093 |
mon_add_command("ls", mon_exec, "ls [args] List directory contents\n"); |
| 1094 |
mon_add_command("rm", mon_exec, "rm [args] Remove file(s)\n"); |
| 1095 |
mon_add_command("cp", mon_exec, "cp [args] Copy file(s)\n"); |
| 1096 |
mon_add_command("mv", mon_exec, "mv [args] Move file(s)\n"); |
| 1097 |
mon_add_command("cd", mon_change_dir, "cd directory Change current directory\n"); |
| 1098 |
mon_add_command("o", redir_output, "o [\"file\"] Redirect output\n"); |
| 1099 |
mon_add_command("[", load_data, "[ start \"file\" Load data from file\n"); |
| 1100 |
mon_add_command("]", save_data, "] start size \"file\" Save data to file\n"); |
| 1101 |
mon_add_command("set", set_var, "set [var[=value]] Set/clear/show variables\n"); |
| 1102 |
mon_add_command("cv", clear_vars, "cv Clear all variables\n"); |
| 1103 |
|
| 1104 |
mon_read_byte = NULL; |
| 1105 |
mon_write_byte = NULL; |
| 1106 |
} |
| 1107 |
|
| 1108 |
|
| 1109 |
/* |
| 1110 |
* Deinitialize mon |
| 1111 |
*/ |
| 1112 |
|
| 1113 |
void mon_exit(void) |
| 1114 |
{ |
| 1115 |
free(cmds); |
| 1116 |
cmds = NULL; |
| 1117 |
num_cmds = 0; |
| 1118 |
cmd_help = NULL; |
| 1119 |
} |
| 1120 |
|
| 1121 |
|
| 1122 |
/* |
| 1123 |
* Main function, read-execute loop |
| 1124 |
*/ |
| 1125 |
|
| 1126 |
void mon(int argc, char **argv) |
| 1127 |
{ |
| 1128 |
bool done = false, interactive = true; |
| 1129 |
char c, cmd[INPUT_LENGTH]; |
| 1130 |
|
| 1131 |
// Setup input/output streams |
| 1132 |
monin = stdin; |
| 1133 |
monout = stdout; |
| 1134 |
monerr = stdout; |
| 1135 |
|
| 1136 |
if (argc) { |
| 1137 |
// Access real memory if mon was started as "rmon" |
| 1138 |
char *prgname = argv[0]; |
| 1139 |
char *lastslash; |
| 1140 |
if ((lastslash = strrchr(prgname, '/')) != NULL) |
| 1141 |
prgname = lastslash + 1; |
| 1142 |
if (strcmp(prgname, "rmon") == 0) |
| 1143 |
mon_use_real_mem = true; |
| 1144 |
|
| 1145 |
// Make argc/argv point to the actual arguments |
| 1146 |
argc--; |
| 1147 |
argv++; |
| 1148 |
interactive = (argc == 0); |
| 1149 |
} |
| 1150 |
|
| 1151 |
// Set up memory access functions if not supplied by the user |
| 1152 |
if (mon_read_byte == NULL) { |
| 1153 |
if (mon_use_real_mem) |
| 1154 |
mon_read_byte = mon_read_byte_real; |
| 1155 |
else |
| 1156 |
mon_read_byte = mon_read_byte_buffer; |
| 1157 |
} |
| 1158 |
if (mon_write_byte == NULL) { |
| 1159 |
if (mon_use_real_mem) |
| 1160 |
mon_write_byte = mon_write_byte_real; |
| 1161 |
else |
| 1162 |
mon_write_byte = mon_write_byte_buffer; |
| 1163 |
} |
| 1164 |
|
| 1165 |
// Allocate buffer |
| 1166 |
if (!mon_use_real_mem) { |
| 1167 |
mon_mem_size = 0x100000; |
| 1168 |
mem = (uint8 *)malloc(mon_mem_size); |
| 1169 |
|
| 1170 |
// Print banner |
| 1171 |
if (interactive) |
| 1172 |
fprintf(monerr, "\n *** mon V" VERSION " by Christian Bauer and Marc Hellwig ***\n" |
| 1173 |
" *** Press 'h' for help ***\n\n"); |
| 1174 |
} |
| 1175 |
|
| 1176 |
init_abort(); |
| 1177 |
|
| 1178 |
// Read and parse command line |
| 1179 |
while (!done) { |
| 1180 |
if (interactive) { |
| 1181 |
char prompt[16]; |
| 1182 |
sprintf(prompt, "[%08x]-> ", mon_dot_address); |
| 1183 |
read_line(prompt); |
| 1184 |
} else { |
| 1185 |
if (argc == 0) { |
| 1186 |
done = true; |
| 1187 |
break; |
| 1188 |
} else { |
| 1189 |
strncpy(in_ptr = input, argv[0], INPUT_LENGTH); |
| 1190 |
argc--; |
| 1191 |
argv++; |
| 1192 |
} |
| 1193 |
} |
| 1194 |
|
| 1195 |
// Skip leading spaces |
| 1196 |
while ((c = get_char()) == ' ') ; |
| 1197 |
|
| 1198 |
// Read command word |
| 1199 |
char *p = cmd; |
| 1200 |
do { |
| 1201 |
*p++ = c; |
| 1202 |
c = get_char(); |
| 1203 |
} while (isgraph(c)); |
| 1204 |
*p = 0; |
| 1205 |
put_back(c); |
| 1206 |
|
| 1207 |
// Execute command |
| 1208 |
if (cmd[0] == 0) // Blank line |
| 1209 |
continue; |
| 1210 |
if (strcmp(cmd, "x") == 0) { // Exit |
| 1211 |
done = true; |
| 1212 |
continue; |
| 1213 |
} |
| 1214 |
for (int i=0; i<num_cmds; i++) { |
| 1215 |
if (strcmp(cmd, cmds[i].name) == 0) { |
| 1216 |
mon_get_token(); |
| 1217 |
cmds[i].func(); |
| 1218 |
goto cmd_done; |
| 1219 |
} |
| 1220 |
} |
| 1221 |
mon_error("Unknown command"); |
| 1222 |
cmd_done: ; |
| 1223 |
} |
| 1224 |
|
| 1225 |
exit_abort(); |
| 1226 |
|
| 1227 |
// Free buffer |
| 1228 |
if (!mon_use_real_mem) |
| 1229 |
free(mem); |
| 1230 |
|
| 1231 |
// Close output file if redirected |
| 1232 |
if (monout != monerr) |
| 1233 |
fclose(monout); |
| 1234 |
} |
