| 1 | /* Native debugging support for Intel x86 running DJGPP. |
| 2 | Copyright 1997, 1999 Free Software Foundation, Inc. |
| 3 | Written by Robert Hoehne. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include <fcntl.h> |
| 22 | |
| 23 | #include "defs.h" |
| 24 | #include "frame.h" /* required by inferior.h */ |
| 25 | #include "inferior.h" |
| 26 | #include "target.h" |
| 27 | #include "wait.h" |
| 28 | #include "gdbcore.h" |
| 29 | #include "command.h" |
| 30 | #include "floatformat.h" |
| 31 | |
| 32 | #include <stdlib.h> |
| 33 | #include <string.h> |
| 34 | #include <unistd.h> |
| 35 | #include <debug/v2load.h> |
| 36 | #include <debug/dbgcom.h> |
| 37 | |
| 38 | extern void _initialize_go32_nat (void); |
| 39 | |
| 40 | struct env387 |
| 41 | { |
| 42 | unsigned short control; |
| 43 | unsigned short r0; |
| 44 | unsigned short status; |
| 45 | unsigned short r1; |
| 46 | unsigned short tag; |
| 47 | unsigned short r2; |
| 48 | unsigned long eip; |
| 49 | unsigned short code_seg; |
| 50 | unsigned short opcode; |
| 51 | unsigned long operand; |
| 52 | unsigned short operand_seg; |
| 53 | unsigned short r3; |
| 54 | unsigned char regs[8][10]; |
| 55 | }; |
| 56 | |
| 57 | extern char **environ; |
| 58 | |
| 59 | #define SOME_PID 42 |
| 60 | |
| 61 | /* FIXME add decls of all static functions here */ |
| 62 | |
| 63 | static int prog_has_started = 0; |
| 64 | |
| 65 | static void |
| 66 | print_387_status (unsigned short status, struct env387 *ep) |
| 67 | { |
| 68 | int i; |
| 69 | int bothstatus; |
| 70 | int top; |
| 71 | int fpreg; |
| 72 | |
| 73 | bothstatus = ((status != 0) && (ep->status != 0)); |
| 74 | if (status != 0) |
| 75 | { |
| 76 | if (bothstatus) |
| 77 | printf_unfiltered ("u: "); |
| 78 | print_387_status_word (status); |
| 79 | } |
| 80 | |
| 81 | if (ep->status != 0) |
| 82 | { |
| 83 | if (bothstatus) |
| 84 | printf_unfiltered ("e: "); |
| 85 | print_387_status_word (ep->status); |
| 86 | } |
| 87 | |
| 88 | print_387_control_word (ep->control & 0xffff); |
| 89 | printf_unfiltered ("last exception: "); |
| 90 | printf_unfiltered ("opcode %s; ", local_hex_string (ep->opcode)); |
| 91 | printf_unfiltered ("pc %s:", local_hex_string (ep->code_seg)); |
| 92 | printf_unfiltered ("%s; ", local_hex_string (ep->eip)); |
| 93 | printf_unfiltered ("operand %s", local_hex_string (ep->operand_seg)); |
| 94 | printf_unfiltered (":%s\n", local_hex_string (ep->operand)); |
| 95 | |
| 96 | top = (ep->status >> 11) & 7; |
| 97 | |
| 98 | printf_unfiltered ("regno tag msb lsb value\n"); |
| 99 | for (fpreg = 0; fpreg < 8; fpreg++) |
| 100 | { |
| 101 | long double val; |
| 102 | |
| 103 | printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg); |
| 104 | |
| 105 | switch ((ep->tag >> (fpreg * 2)) & 3) |
| 106 | { |
| 107 | case 0: |
| 108 | printf_unfiltered ("valid "); |
| 109 | break; |
| 110 | case 1: |
| 111 | printf_unfiltered ("zero "); |
| 112 | break; |
| 113 | case 2: |
| 114 | printf_unfiltered ("trap "); |
| 115 | break; |
| 116 | case 3: |
| 117 | printf_unfiltered ("empty "); |
| 118 | break; |
| 119 | } |
| 120 | for (i = 0; i < 8; i++) |
| 121 | printf_unfiltered ("%02x", ep->regs[fpreg][i]); |
| 122 | |
| 123 | REGISTER_CONVERT_TO_VIRTUAL (FP0_REGNUM + fpreg, builtin_type_long_double, |
| 124 | &ep->regs[fpreg], &val); |
| 125 | |
| 126 | printf_unfiltered (" %LG\n", val); |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | void |
| 131 | i386_go32_float_info (void) |
| 132 | { |
| 133 | print_387_status (0, (struct env387 *) &npx); |
| 134 | } |
| 135 | |
| 136 | #define r_ofs(x) ((int)(&(((TSS *)0)->x))) |
| 137 | |
| 138 | static struct |
| 139 | { |
| 140 | int tss_ofs; |
| 141 | int size; |
| 142 | } |
| 143 | regno_mapping[] = |
| 144 | { |
| 145 | r_ofs (tss_eax), 4, |
| 146 | r_ofs (tss_ecx), 4, |
| 147 | r_ofs (tss_edx), 4, |
| 148 | r_ofs (tss_ebx), 4, |
| 149 | r_ofs (tss_esp), 4, |
| 150 | r_ofs (tss_ebp), 4, |
| 151 | r_ofs (tss_esi), 4, |
| 152 | r_ofs (tss_edi), 4, |
| 153 | r_ofs (tss_eip), 4, |
| 154 | r_ofs (tss_eflags), 4, |
| 155 | r_ofs (tss_cs), 2, |
| 156 | r_ofs (tss_ss), 2, |
| 157 | r_ofs (tss_ds), 2, |
| 158 | r_ofs (tss_es), 2, |
| 159 | r_ofs (tss_fs), 2, |
| 160 | r_ofs (tss_gs), 2, |
| 161 | 0, 10, |
| 162 | 1, 10, |
| 163 | 2, 10, |
| 164 | 3, 10, |
| 165 | 4, 10, |
| 166 | 5, 10, |
| 167 | 6, 10, |
| 168 | 7, 10, |
| 169 | 0, 2, |
| 170 | 4, 2, |
| 171 | 8, 2, |
| 172 | 12, 4, |
| 173 | 16, 2, |
| 174 | 20, 4, |
| 175 | 24, 2 |
| 176 | }; |
| 177 | |
| 178 | static struct |
| 179 | { |
| 180 | int go32_sig; |
| 181 | int gdb_sig; |
| 182 | } |
| 183 | sig_map[] = |
| 184 | { |
| 185 | 0, TARGET_SIGNAL_FPE, |
| 186 | 1, TARGET_SIGNAL_TRAP, |
| 187 | 2, TARGET_SIGNAL_UNKNOWN, |
| 188 | 3, TARGET_SIGNAL_TRAP, |
| 189 | 4, TARGET_SIGNAL_FPE, |
| 190 | 5, TARGET_SIGNAL_SEGV, |
| 191 | 6, TARGET_SIGNAL_ILL, |
| 192 | 7, TARGET_SIGNAL_FPE, |
| 193 | 8, TARGET_SIGNAL_SEGV, |
| 194 | 9, TARGET_SIGNAL_SEGV, |
| 195 | 10, TARGET_SIGNAL_BUS, |
| 196 | 11, TARGET_SIGNAL_SEGV, |
| 197 | 12, TARGET_SIGNAL_SEGV, |
| 198 | 13, TARGET_SIGNAL_ABRT, |
| 199 | 14, TARGET_SIGNAL_SEGV, |
| 200 | 16, TARGET_SIGNAL_FPE, |
| 201 | 31, TARGET_SIGNAL_ILL, |
| 202 | 0x75, TARGET_SIGNAL_FPE, |
| 203 | 0x79, TARGET_SIGNAL_INT, |
| 204 | 0x1b, TARGET_SIGNAL_INT, |
| 205 | -1, -1 |
| 206 | }; |
| 207 | |
| 208 | static void |
| 209 | go32_open (char *name, int from_tty) |
| 210 | { |
| 211 | printf_unfiltered ("Use the `run' command to run go32 programs\n"); |
| 212 | } |
| 213 | |
| 214 | static void |
| 215 | go32_close (int quitting) |
| 216 | { |
| 217 | } |
| 218 | |
| 219 | static void |
| 220 | go32_attach (char *args, int from_tty) |
| 221 | { |
| 222 | printf_unfiltered ("Use the `run' command to run go32 programs\n"); |
| 223 | } |
| 224 | |
| 225 | static void |
| 226 | go32_detach (char *args, int from_tty) |
| 227 | { |
| 228 | } |
| 229 | |
| 230 | static int resume_is_step; |
| 231 | |
| 232 | static void |
| 233 | go32_resume (int pid, int step, enum target_signal siggnal) |
| 234 | { |
| 235 | resume_is_step = step; |
| 236 | } |
| 237 | |
| 238 | static int |
| 239 | go32_wait (int pid, struct target_waitstatus *status) |
| 240 | { |
| 241 | int i; |
| 242 | |
| 243 | if (resume_is_step) |
| 244 | a_tss.tss_eflags |= 0x0100; |
| 245 | else |
| 246 | a_tss.tss_eflags &= 0xfeff; |
| 247 | |
| 248 | run_child (); |
| 249 | |
| 250 | if (a_tss.tss_irqn == 0x21) |
| 251 | { |
| 252 | status->kind = TARGET_WAITKIND_EXITED; |
| 253 | status->value.integer = a_tss.tss_eax & 0xff; |
| 254 | } |
| 255 | else |
| 256 | { |
| 257 | status->value.sig = TARGET_SIGNAL_UNKNOWN; |
| 258 | status->kind = TARGET_WAITKIND_STOPPED; |
| 259 | for (i = 0; sig_map[i].go32_sig != -1; i++) |
| 260 | { |
| 261 | if (a_tss.tss_irqn == sig_map[i].go32_sig) |
| 262 | { |
| 263 | if ((status->value.sig = sig_map[i].gdb_sig) != |
| 264 | TARGET_SIGNAL_TRAP) |
| 265 | status->kind = TARGET_WAITKIND_SIGNALLED; |
| 266 | break; |
| 267 | } |
| 268 | } |
| 269 | } |
| 270 | return SOME_PID; |
| 271 | } |
| 272 | |
| 273 | static void |
| 274 | go32_fetch_registers (int regno) |
| 275 | { |
| 276 | /*JHW*/ |
| 277 | int end_reg = regno + 1; /* just one reg initially */ |
| 278 | |
| 279 | if (regno < 0) /* do the all registers */ |
| 280 | { |
| 281 | regno = 0; /* start at first register */ |
| 282 | /* # regs in table */ |
| 283 | end_reg = sizeof (regno_mapping) / sizeof (regno_mapping[0]); |
| 284 | } |
| 285 | |
| 286 | for (; regno < end_reg; regno++) |
| 287 | { |
| 288 | if (regno < 16) |
| 289 | supply_register (regno, |
| 290 | (char *) &a_tss + regno_mapping[regno].tss_ofs); |
| 291 | else if (regno < 24) |
| 292 | supply_register (regno, |
| 293 | (char *) &npx.reg[regno_mapping[regno].tss_ofs]); |
| 294 | else if (regno < 31) |
| 295 | supply_register (regno, |
| 296 | (char *) &npx.reg + regno_mapping[regno].tss_ofs); |
| 297 | else |
| 298 | { |
| 299 | printf_unfiltered ("Invalid register in go32_fetch_register(%d)", |
| 300 | regno); |
| 301 | exit (1); |
| 302 | } |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | static void |
| 307 | store_register (int regno) |
| 308 | { |
| 309 | void *rp; |
| 310 | void *v = (void *) ®isters[REGISTER_BYTE (regno)]; |
| 311 | |
| 312 | if (regno < 16) |
| 313 | rp = (char *) &a_tss + regno_mapping[regno].tss_ofs; |
| 314 | else if (regno < 24) |
| 315 | rp = (char *) &npx.reg[regno_mapping[regno].tss_ofs]; |
| 316 | else if (regno > 31) |
| 317 | rp = (char *) &npx + regno_mapping[regno].tss_ofs; |
| 318 | else |
| 319 | { |
| 320 | printf_unfiltered ("Invalid register in store_register(%d)", regno); |
| 321 | exit (1); |
| 322 | } |
| 323 | memcpy (rp, v, regno_mapping[regno].size); |
| 324 | } |
| 325 | |
| 326 | static void |
| 327 | go32_store_registers (int regno) |
| 328 | { |
| 329 | int r; |
| 330 | |
| 331 | if (regno >= 0) |
| 332 | store_register (regno); |
| 333 | else |
| 334 | { |
| 335 | for (r = 0; r < sizeof (regno_mapping) / sizeof (regno_mapping[0]); r++) |
| 336 | store_register (r); |
| 337 | } |
| 338 | } |
| 339 | |
| 340 | static void |
| 341 | go32_prepare_to_store (void) |
| 342 | { |
| 343 | } |
| 344 | |
| 345 | static int |
| 346 | go32_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, |
| 347 | struct target_ops *target) |
| 348 | { |
| 349 | if (write) |
| 350 | { |
| 351 | if (write_child (memaddr, myaddr, len)) |
| 352 | { |
| 353 | return 0; |
| 354 | } |
| 355 | else |
| 356 | { |
| 357 | return len; |
| 358 | } |
| 359 | } |
| 360 | else |
| 361 | { |
| 362 | if (read_child (memaddr, myaddr, len)) |
| 363 | { |
| 364 | return 0; |
| 365 | } |
| 366 | else |
| 367 | { |
| 368 | return len; |
| 369 | } |
| 370 | } |
| 371 | } |
| 372 | |
| 373 | static void |
| 374 | go32_files_info (struct target_ops *target) |
| 375 | { |
| 376 | printf_unfiltered ("You are running a DJGPP V2 program\n"); |
| 377 | } |
| 378 | |
| 379 | static void |
| 380 | go32_stop (void) |
| 381 | { |
| 382 | normal_stop (); |
| 383 | cleanup_client (); |
| 384 | inferior_pid = 0; |
| 385 | prog_has_started = 0; |
| 386 | } |
| 387 | |
| 388 | static void |
| 389 | go32_kill_inferior (void) |
| 390 | { |
| 391 | go32_stop (); |
| 392 | unpush_target (&go32_ops); |
| 393 | } |
| 394 | |
| 395 | static void |
| 396 | go32_create_inferior (char *exec_file, char *args, char **env) |
| 397 | { |
| 398 | jmp_buf start_state; |
| 399 | char *cmdline; |
| 400 | char **env_save = environ; |
| 401 | |
| 402 | if (prog_has_started) |
| 403 | { |
| 404 | go32_kill_inferior (); |
| 405 | } |
| 406 | |
| 407 | cmdline = (char *) alloca (strlen (args) + 4); |
| 408 | cmdline[0] = strlen (args); |
| 409 | strcpy (cmdline + 1, args); |
| 410 | cmdline[strlen (args) + 1] = 13; |
| 411 | |
| 412 | environ = env; |
| 413 | |
| 414 | if (v2loadimage (exec_file, cmdline, start_state)) |
| 415 | { |
| 416 | environ = env_save; |
| 417 | printf_unfiltered ("Load failed for image %s\n", exec_file); |
| 418 | exit (1); |
| 419 | } |
| 420 | environ = env_save; |
| 421 | |
| 422 | edi_init (start_state); |
| 423 | |
| 424 | inferior_pid = SOME_PID; |
| 425 | push_target (&go32_ops); |
| 426 | clear_proceed_status (); |
| 427 | insert_breakpoints (); |
| 428 | proceed ((CORE_ADDR) - 1, TARGET_SIGNAL_0, 0); |
| 429 | } |
| 430 | |
| 431 | static void |
| 432 | go32_mourn_inferior (void) |
| 433 | { |
| 434 | go32_kill_inferior (); |
| 435 | generic_mourn_inferior (); |
| 436 | } |
| 437 | |
| 438 | static int |
| 439 | go32_can_run (void) |
| 440 | { |
| 441 | return 1; |
| 442 | } |
| 443 | |
| 444 | static void |
| 445 | ignore (void) |
| 446 | { |
| 447 | } |
| 448 | |
| 449 | static void |
| 450 | ignore2 (char *a, int b) |
| 451 | { |
| 452 | } |
| 453 | |
| 454 | /* Hardware watchpoint support. */ |
| 455 | |
| 456 | #define DR_STATUS 6 |
| 457 | #define DR_CONTROL 7 |
| 458 | #define DR_ENABLE_SIZE 2 |
| 459 | #define DR_LOCAL_ENABLE_SHIFT 0 |
| 460 | #define DR_GLOBAL_ENABLE_SHIFT 1 |
| 461 | #define DR_LOCAL_SLOWDOWN 0x100 |
| 462 | #define DR_GLOBAL_SLOWDOWN 0x200 |
| 463 | #define DR_CONTROL_SHIFT 16 |
| 464 | #define DR_CONTROL_SIZE 4 |
| 465 | #define DR_RW_READ 0x3 |
| 466 | #define DR_RW_WRITE 0x1 |
| 467 | #define DR_CONTROL_MASK 0xf |
| 468 | #define DR_ENABLE_MASK 0x3 |
| 469 | #define DR_LEN_1 0x0 |
| 470 | #define DR_LEN_2 0x4 |
| 471 | #define DR_LEN_4 0xc |
| 472 | |
| 473 | #define D_REGS edi.dr |
| 474 | #define CONTROL D_REGS[DR_CONTROL] |
| 475 | #define STATUS D_REGS[DR_STATUS] |
| 476 | |
| 477 | #define IS_REG_FREE(index) \ |
| 478 | (!(CONTROL & (3 << (DR_ENABLE_SIZE * index)))) |
| 479 | |
| 480 | #define LOCAL_ENABLE_REG(index) \ |
| 481 | (CONTROL |= (1 << (DR_LOCAL_ENABLE_SHIFT + DR_ENABLE_SIZE * index))) |
| 482 | |
| 483 | #define GLOBAL_ENABLE_REG(index) \ |
| 484 | (CONTROL |= (1 << (DR_GLOBAL_ENABLE_SHIFT + DR_ENABLE_SIZE * index))) |
| 485 | |
| 486 | #define DISABLE_REG(index) \ |
| 487 | (CONTROL &= ~(3 << (DR_ENABLE_SIZE * index))) |
| 488 | |
| 489 | #define SET_LOCAL_EXACT() \ |
| 490 | (CONTROL |= DR_LOCAL_SLOWDOWN) |
| 491 | |
| 492 | #define SET_GLOBAL_EXACT() \ |
| 493 | (CONTROL |= DR_GLOBAL_SLOWDOWN) |
| 494 | |
| 495 | #define SET_BREAK(index,address) \ |
| 496 | do {\ |
| 497 | CONTROL &= ~(DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * index));\ |
| 498 | D_REGS[index] = address;\ |
| 499 | } while(0) |
| 500 | |
| 501 | #define SET_WATCH(index,address,rw,len) \ |
| 502 | do {\ |
| 503 | SET_BREAK(index,address);\ |
| 504 | CONTROL |= (len | rw) << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * index);\ |
| 505 | } while (0) |
| 506 | |
| 507 | #define WATCH_HIT(index) \ |
| 508 | (\ |
| 509 | (STATUS & (1 << index)) && \ |
| 510 | (CONTROL & (DR_CONTROL_MASK << (DR_CONTROL_SHIFT + DR_CONTROL_SIZE * index)))\ |
| 511 | ) |
| 512 | |
| 513 | #if 0 /* use debugging macro */ |
| 514 | #define SHOW_DR(text) \ |
| 515 | do { \ |
| 516 | fprintf(stderr,"%08x %08x ",edi.dr[7],edi.dr[6]); \ |
| 517 | fprintf(stderr,"%08x %08x ",edi.dr[0],edi.dr[1]); \ |
| 518 | fprintf(stderr,"%08x %08x ",edi.dr[2],edi.dr[3]); \ |
| 519 | fprintf(stderr,"(%s)\n",#text); \ |
| 520 | } while (0) |
| 521 | #else |
| 522 | #define SHOW_DR(text) do {} while (0) |
| 523 | #endif |
| 524 | |
| 525 | static int go32_insert_aligned_watchpoint (int pid, CORE_ADDR waddr, |
| 526 | CORE_ADDR addr, int len, int rw); |
| 527 | |
| 528 | static int go32_insert_nonaligned_watchpoint (int pid, CORE_ADDR waddr, |
| 529 | CORE_ADDR addr, int len, int rw); |
| 530 | |
| 531 | /* Insert a watchpoint. */ |
| 532 | |
| 533 | int |
| 534 | go32_insert_watchpoint (int pid, CORE_ADDR addr, int len, int rw) |
| 535 | { |
| 536 | int ret = go32_insert_aligned_watchpoint (pid, addr, addr, len, rw); |
| 537 | |
| 538 | SHOW_DR (insert_watch); |
| 539 | return ret; |
| 540 | } |
| 541 | |
| 542 | static int |
| 543 | go32_insert_aligned_watchpoint (int pid, CORE_ADDR waddr, CORE_ADDR addr, |
| 544 | int len, int rw) |
| 545 | { |
| 546 | int i; |
| 547 | int read_write_bits, len_bits; |
| 548 | |
| 549 | /* Look for a free debug register. */ |
| 550 | for (i = 0; i <= 3; i++) |
| 551 | { |
| 552 | if (IS_REG_FREE (i)) |
| 553 | break; |
| 554 | } |
| 555 | |
| 556 | /* No more debug registers! */ |
| 557 | if (i > 3) |
| 558 | return -1; |
| 559 | |
| 560 | read_write_bits = ((rw & 1) ? DR_RW_READ : 0) | ((rw & 2) ? DR_RW_WRITE : 0); |
| 561 | |
| 562 | if (len == 1) |
| 563 | len_bits = DR_LEN_1; |
| 564 | else if (len == 2) |
| 565 | { |
| 566 | if (addr % 2) |
| 567 | return go32_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw); |
| 568 | len_bits = DR_LEN_2; |
| 569 | } |
| 570 | else if (len == 4) |
| 571 | { |
| 572 | if (addr % 4) |
| 573 | return go32_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw); |
| 574 | len_bits = DR_LEN_4; |
| 575 | } |
| 576 | else |
| 577 | return go32_insert_nonaligned_watchpoint (pid, waddr, addr, len, rw); |
| 578 | |
| 579 | SET_WATCH (i, addr, read_write_bits, len_bits); |
| 580 | LOCAL_ENABLE_REG (i); |
| 581 | SET_LOCAL_EXACT (); |
| 582 | } |
| 583 | |
| 584 | static int |
| 585 | go32_insert_nonaligned_watchpoint (int pid, CORE_ADDR waddr, CORE_ADDR addr, |
| 586 | int len, int rw) |
| 587 | { |
| 588 | int align; |
| 589 | int size; |
| 590 | int rv = 0; |
| 591 | |
| 592 | static int size_try_array[16] = |
| 593 | { |
| 594 | 1, 1, 1, 1, /* trying size one */ |
| 595 | 2, 1, 2, 1, /* trying size two */ |
| 596 | 2, 1, 2, 1, /* trying size three */ |
| 597 | 4, 1, 2, 1 /* trying size four */ |
| 598 | }; |
| 599 | |
| 600 | while (len > 0) |
| 601 | { |
| 602 | align = addr % 4; |
| 603 | /* Four is the maximum length for 386. */ |
| 604 | size = (len > 4) ? 3 : len - 1; |
| 605 | size = size_try_array[size * 4 + align]; |
| 606 | rv = go32_insert_aligned_watchpoint (pid, waddr, addr, size, rw); |
| 607 | if (rv) |
| 608 | { |
| 609 | go32_remove_watchpoint (pid, waddr, size); |
| 610 | return rv; |
| 611 | } |
| 612 | addr += size; |
| 613 | len -= size; |
| 614 | } |
| 615 | return rv; |
| 616 | } |
| 617 | |
| 618 | /* Remove a watchpoint. */ |
| 619 | |
| 620 | int |
| 621 | go32_remove_watchpoint (int pid, CORE_ADDR addr, int len) |
| 622 | { |
| 623 | int i; |
| 624 | |
| 625 | for (i = 0; i <= 3; i++) |
| 626 | { |
| 627 | if (D_REGS[i] == addr) |
| 628 | { |
| 629 | DISABLE_REG (i); |
| 630 | } |
| 631 | } |
| 632 | SHOW_DR (remove_watch); |
| 633 | |
| 634 | return 0; |
| 635 | } |
| 636 | |
| 637 | /* Check if stopped by a watchpoint. */ |
| 638 | |
| 639 | CORE_ADDR |
| 640 | go32_stopped_by_watchpoint (int pid) |
| 641 | { |
| 642 | int i, ret = 0; |
| 643 | int status; |
| 644 | |
| 645 | status = edi.dr[DR_STATUS]; |
| 646 | SHOW_DR (stopped_by); |
| 647 | for (i = 0; i <= 3; i++) |
| 648 | { |
| 649 | if (WATCH_HIT (i)) |
| 650 | { |
| 651 | SHOW_DR (HIT); |
| 652 | ret = D_REGS[i]; |
| 653 | } |
| 654 | } |
| 655 | /* this is a hack to GDB. If we stopped at a hardware breakpoint, |
| 656 | the stop_pc must incremented by DECR_PC_AFTER_BREAK. I tried everything |
| 657 | with the DECR_PC_AFTER_HW_BREAK, but nothing works. */ |
| 658 | /* This is probably fixed by jtc's recent patch -sts 2/19/99 */ |
| 659 | if (STATUS && !ret) |
| 660 | stop_pc += DECR_PC_AFTER_BREAK; |
| 661 | STATUS = 0; |
| 662 | |
| 663 | return ret; |
| 664 | } |
| 665 | |
| 666 | /* Remove a breakpoint. */ |
| 667 | |
| 668 | int |
| 669 | go32_remove_hw_breakpoint (CORE_ADDR addr, CORE_ADDR shadow) |
| 670 | { |
| 671 | int i; |
| 672 | for (i = 0; i <= 3; i++) |
| 673 | { |
| 674 | if (D_REGS[i] == addr) |
| 675 | { |
| 676 | DISABLE_REG (i); |
| 677 | } |
| 678 | } |
| 679 | SHOW_DR (remove_hw); |
| 680 | return 0; |
| 681 | } |
| 682 | |
| 683 | int |
| 684 | go32_insert_hw_breakpoint (CORE_ADDR addr, CORE_ADDR shadow) |
| 685 | { |
| 686 | int i; |
| 687 | int read_write_bits, len_bits; |
| 688 | int free_debug_register; |
| 689 | int register_number; |
| 690 | |
| 691 | /* Look for a free debug register. */ |
| 692 | for (i = 0; i <= 3; i++) |
| 693 | { |
| 694 | if (IS_REG_FREE (i)) |
| 695 | break; |
| 696 | } |
| 697 | |
| 698 | /* No more debug registers! */ |
| 699 | if (i > 3) |
| 700 | return -1; |
| 701 | |
| 702 | SET_BREAK (i, addr); |
| 703 | LOCAL_ENABLE_REG (i); |
| 704 | SHOW_DR (insert_hw); |
| 705 | |
| 706 | return 0; |
| 707 | } |
| 708 | |
| 709 | static struct target_ops go32_ops; |
| 710 | |
| 711 | static void |
| 712 | init_go32_ops (void) |
| 713 | { |
| 714 | go32_ops.to_shortname = "djgpp"; |
| 715 | go32_ops.to_longname = "djgpp target process"; |
| 716 | go32_ops.to_doc = |
| 717 | "Program loaded by djgpp, when gdb is used as an external debugger"; |
| 718 | go32_ops.to_open = go32_open; |
| 719 | go32_ops.to_close = go32_close; |
| 720 | go32_ops.to_detach = go32_detach; |
| 721 | go32_ops.to_resume = go32_resume; |
| 722 | go32_ops.to_wait = go32_wait; |
| 723 | go32_ops.to_fetch_registers = go32_fetch_registers; |
| 724 | go32_ops.to_store_registers = go32_store_registers; |
| 725 | go32_ops.to_prepare_to_store = go32_prepare_to_store; |
| 726 | go32_ops.to_xfer_memory = go32_xfer_memory; |
| 727 | go32_ops.to_files_info = go32_files_info; |
| 728 | go32_ops.to_insert_breakpoint = memory_insert_breakpoint; |
| 729 | go32_ops.to_remove_breakpoint = memory_remove_breakpoint; |
| 730 | go32_ops.to_terminal_init = ignore; |
| 731 | go32_ops.to_terminal_inferior = ignore; |
| 732 | go32_ops.to_terminal_ours_for_output = ignore; |
| 733 | go32_ops.to_terminal_ours = ignore; |
| 734 | go32_ops.to_terminal_info = ignore2; |
| 735 | go32_ops.to_kill = go32_kill_inferior; |
| 736 | go32_ops.to_create_inferior = go32_create_inferior; |
| 737 | go32_ops.to_mourn_inferior = go32_mourn_inferior; |
| 738 | go32_ops.to_can_run = go32_can_run; |
| 739 | go32_ops.to_stop = go32_stop; |
| 740 | go32_ops.to_stratum = process_stratum; |
| 741 | go32_ops.to_has_all_memory = 1; |
| 742 | go32_ops.to_has_memory = 1; |
| 743 | go32_ops.to_has_stack = 1; |
| 744 | go32_ops.to_has_registers = 1; |
| 745 | go32_ops.to_has_execution = 1; |
| 746 | go32_ops.to_magic = OPS_MAGIC; |
| 747 | } |
| 748 | |
| 749 | void |
| 750 | _initialize_go32_nat (void) |
| 751 | { |
| 752 | init_go32_ops (); |
| 753 | add_target (&go32_ops); |
| 754 | } |