| 1 | /* |
| 2 | * Mach Operating System |
| 3 | * Copyright (c) 1991,1990 Carnegie Mellon University |
| 4 | * All Rights Reserved. |
| 5 | * |
| 6 | * Permission to use, copy, modify and distribute this software and its |
| 7 | * documentation is hereby granted, provided that both the copyright |
| 8 | * notice and this permission notice appear in all copies of the |
| 9 | * software, derivative works or modified versions, and any portions |
| 10 | * thereof, and that both notices appear in supporting documentation. |
| 11 | * |
| 12 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS |
| 13 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR |
| 14 | * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. |
| 15 | * |
| 16 | * Carnegie Mellon requests users of this software to return to |
| 17 | * |
| 18 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU |
| 19 | * School of Computer Science |
| 20 | * Carnegie Mellon University |
| 21 | * Pittsburgh PA 15213-3890 |
| 22 | * |
| 23 | * any improvements or extensions that they make and grant Carnegie the |
| 24 | * rights to redistribute these changes. |
| 25 | * |
| 26 | * $FreeBSD: src/sys/i386/i386/db_trace.c,v 1.35.2.3 2002/02/21 22:31:25 silby Exp $ |
| 27 | * $DragonFly: src/sys/platform/pc32/i386/db_trace.c,v 1.6 2003/08/26 21:42:18 rob Exp $ |
| 28 | */ |
| 29 | |
| 30 | #include <sys/param.h> |
| 31 | #include <sys/systm.h> |
| 32 | #include <sys/linker_set.h> |
| 33 | #include <sys/lock.h> |
| 34 | #include <sys/proc.h> |
| 35 | |
| 36 | #include <machine/cpu.h> |
| 37 | #include <machine/md_var.h> |
| 38 | #include <machine/reg.h> |
| 39 | |
| 40 | #include <vm/vm.h> |
| 41 | #include <vm/vm_param.h> |
| 42 | #include <vm/pmap.h> |
| 43 | #include <vm/vm_map.h> |
| 44 | #include <ddb/ddb.h> |
| 45 | |
| 46 | #include <sys/user.h> |
| 47 | |
| 48 | #include <ddb/db_access.h> |
| 49 | #include <ddb/db_sym.h> |
| 50 | #include <ddb/db_variables.h> |
| 51 | |
| 52 | db_varfcn_t db_dr0; |
| 53 | db_varfcn_t db_dr1; |
| 54 | db_varfcn_t db_dr2; |
| 55 | db_varfcn_t db_dr3; |
| 56 | db_varfcn_t db_dr4; |
| 57 | db_varfcn_t db_dr5; |
| 58 | db_varfcn_t db_dr6; |
| 59 | db_varfcn_t db_dr7; |
| 60 | |
| 61 | /* |
| 62 | * Machine register set. |
| 63 | */ |
| 64 | struct db_variable db_regs[] = { |
| 65 | { "cs", &ddb_regs.tf_cs, FCN_NULL }, |
| 66 | { "ds", &ddb_regs.tf_ds, FCN_NULL }, |
| 67 | { "es", &ddb_regs.tf_es, FCN_NULL }, |
| 68 | { "fs", &ddb_regs.tf_fs, FCN_NULL }, |
| 69 | #if 0 |
| 70 | { "gs", &ddb_regs.tf_gs, FCN_NULL }, |
| 71 | #endif |
| 72 | { "ss", &ddb_regs.tf_ss, FCN_NULL }, |
| 73 | { "eax", &ddb_regs.tf_eax, FCN_NULL }, |
| 74 | { "ecx", &ddb_regs.tf_ecx, FCN_NULL }, |
| 75 | { "edx", &ddb_regs.tf_edx, FCN_NULL }, |
| 76 | { "ebx", &ddb_regs.tf_ebx, FCN_NULL }, |
| 77 | { "esp", &ddb_regs.tf_esp, FCN_NULL }, |
| 78 | { "ebp", &ddb_regs.tf_ebp, FCN_NULL }, |
| 79 | { "esi", &ddb_regs.tf_esi, FCN_NULL }, |
| 80 | { "edi", &ddb_regs.tf_edi, FCN_NULL }, |
| 81 | { "eip", &ddb_regs.tf_eip, FCN_NULL }, |
| 82 | { "efl", &ddb_regs.tf_eflags, FCN_NULL }, |
| 83 | { "dr0", NULL, db_dr0 }, |
| 84 | { "dr1", NULL, db_dr1 }, |
| 85 | { "dr2", NULL, db_dr2 }, |
| 86 | { "dr3", NULL, db_dr3 }, |
| 87 | { "dr4", NULL, db_dr4 }, |
| 88 | { "dr5", NULL, db_dr5 }, |
| 89 | { "dr6", NULL, db_dr6 }, |
| 90 | { "dr7", NULL, db_dr7 }, |
| 91 | }; |
| 92 | struct db_variable *db_eregs = db_regs + sizeof(db_regs)/sizeof(db_regs[0]); |
| 93 | |
| 94 | /* |
| 95 | * Stack trace. |
| 96 | */ |
| 97 | #define INKERNEL(va) (((vm_offset_t)(va)) >= USRSTACK) |
| 98 | |
| 99 | struct i386_frame { |
| 100 | struct i386_frame *f_frame; |
| 101 | int f_retaddr; |
| 102 | int f_arg0; |
| 103 | }; |
| 104 | |
| 105 | #define NORMAL 0 |
| 106 | #define TRAP 1 |
| 107 | #define INTERRUPT 2 |
| 108 | #define SYSCALL 3 |
| 109 | |
| 110 | static void db_nextframe (struct i386_frame **, db_addr_t *); |
| 111 | static int db_numargs (struct i386_frame *); |
| 112 | static void db_print_stack_entry (const char *, int, char **, int *, db_addr_t); |
| 113 | |
| 114 | |
| 115 | static char * watchtype_str (int type); |
| 116 | int i386_set_watch (int watchnum, unsigned int watchaddr, |
| 117 | int size, int access, struct dbreg * d); |
| 118 | int i386_clr_watch (int watchnum, struct dbreg * d); |
| 119 | int db_md_set_watchpoint (db_expr_t addr, db_expr_t size); |
| 120 | int db_md_clr_watchpoint (db_expr_t addr, db_expr_t size); |
| 121 | void db_md_list_watchpoints (void); |
| 122 | |
| 123 | |
| 124 | /* |
| 125 | * Figure out how many arguments were passed into the frame at "fp". |
| 126 | */ |
| 127 | static int |
| 128 | db_numargs(fp) |
| 129 | struct i386_frame *fp; |
| 130 | { |
| 131 | int *argp; |
| 132 | int inst; |
| 133 | int args; |
| 134 | |
| 135 | argp = (int *)db_get_value((int)&fp->f_retaddr, 4, FALSE); |
| 136 | /* |
| 137 | * XXX etext is wrong for LKMs. We should attempt to interpret |
| 138 | * the instruction at the return address in all cases. This |
| 139 | * may require better fault handling. |
| 140 | */ |
| 141 | if (argp < (int *)btext || argp >= (int *)etext) { |
| 142 | args = 5; |
| 143 | } else { |
| 144 | inst = db_get_value((int)argp, 4, FALSE); |
| 145 | if ((inst & 0xff) == 0x59) /* popl %ecx */ |
| 146 | args = 1; |
| 147 | else if ((inst & 0xffff) == 0xc483) /* addl $Ibs, %esp */ |
| 148 | args = ((inst >> 16) & 0xff) / 4; |
| 149 | else |
| 150 | args = 5; |
| 151 | } |
| 152 | return (args); |
| 153 | } |
| 154 | |
| 155 | static void |
| 156 | db_print_stack_entry(name, narg, argnp, argp, callpc) |
| 157 | const char *name; |
| 158 | int narg; |
| 159 | char **argnp; |
| 160 | int *argp; |
| 161 | db_addr_t callpc; |
| 162 | { |
| 163 | db_printf("%s(", name); |
| 164 | while (narg) { |
| 165 | if (argnp) |
| 166 | db_printf("%s=", *argnp++); |
| 167 | db_printf("%r", db_get_value((int)argp, 4, FALSE)); |
| 168 | argp++; |
| 169 | if (--narg != 0) |
| 170 | db_printf(","); |
| 171 | } |
| 172 | db_printf(") at "); |
| 173 | db_printsym(callpc, DB_STGY_PROC); |
| 174 | db_printf("\n"); |
| 175 | } |
| 176 | |
| 177 | /* |
| 178 | * Figure out the next frame up in the call stack. |
| 179 | */ |
| 180 | static void |
| 181 | db_nextframe(fp, ip) |
| 182 | struct i386_frame **fp; /* in/out */ |
| 183 | db_addr_t *ip; /* out */ |
| 184 | { |
| 185 | struct trapframe *tf; |
| 186 | int frame_type; |
| 187 | int eip, esp, ebp; |
| 188 | db_expr_t offset; |
| 189 | const char *sym, *name; |
| 190 | |
| 191 | eip = db_get_value((int) &(*fp)->f_retaddr, 4, FALSE); |
| 192 | ebp = db_get_value((int) &(*fp)->f_frame, 4, FALSE); |
| 193 | |
| 194 | /* |
| 195 | * Figure out frame type. |
| 196 | */ |
| 197 | |
| 198 | frame_type = NORMAL; |
| 199 | |
| 200 | sym = db_search_symbol(eip, DB_STGY_ANY, &offset); |
| 201 | db_symbol_values(sym, &name, NULL); |
| 202 | if (name != NULL) { |
| 203 | if (!strcmp(name, "calltrap")) { |
| 204 | frame_type = TRAP; |
| 205 | } else if (!strncmp(name, "Xresume", 7)) { |
| 206 | frame_type = INTERRUPT; |
| 207 | } else if (!strcmp(name, "_Xsyscall")) { |
| 208 | frame_type = SYSCALL; |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | /* |
| 213 | * Normal frames need no special processing. |
| 214 | */ |
| 215 | if (frame_type == NORMAL) { |
| 216 | *ip = (db_addr_t) eip; |
| 217 | *fp = (struct i386_frame *) ebp; |
| 218 | return; |
| 219 | } |
| 220 | |
| 221 | db_print_stack_entry(name, 0, 0, 0, eip); |
| 222 | |
| 223 | /* |
| 224 | * Point to base of trapframe which is just above the |
| 225 | * current frame. |
| 226 | */ |
| 227 | tf = (struct trapframe *) ((int)*fp + 8); |
| 228 | |
| 229 | esp = (ISPL(tf->tf_cs) == SEL_UPL) ? tf->tf_esp : (int)&tf->tf_esp; |
| 230 | switch (frame_type) { |
| 231 | case TRAP: |
| 232 | if (INKERNEL((int) tf)) { |
| 233 | eip = tf->tf_eip; |
| 234 | ebp = tf->tf_ebp; |
| 235 | db_printf( |
| 236 | "--- trap %#r, eip = %#r, esp = %#r, ebp = %#r ---\n", |
| 237 | tf->tf_trapno, eip, esp, ebp); |
| 238 | } |
| 239 | break; |
| 240 | case SYSCALL: |
| 241 | if (INKERNEL((int) tf)) { |
| 242 | eip = tf->tf_eip; |
| 243 | ebp = tf->tf_ebp; |
| 244 | db_printf( |
| 245 | "--- syscall %#r, eip = %#r, esp = %#r, ebp = %#r ---\n", |
| 246 | tf->tf_eax, eip, esp, ebp); |
| 247 | } |
| 248 | break; |
| 249 | case INTERRUPT: |
| 250 | tf = (struct trapframe *)((int)*fp + 16); |
| 251 | if (INKERNEL((int) tf)) { |
| 252 | eip = tf->tf_eip; |
| 253 | ebp = tf->tf_ebp; |
| 254 | db_printf( |
| 255 | "--- interrupt, eip = %#r, esp = %#r, ebp = %#r ---\n", |
| 256 | eip, esp, ebp); |
| 257 | } |
| 258 | break; |
| 259 | default: |
| 260 | break; |
| 261 | } |
| 262 | |
| 263 | *ip = (db_addr_t) eip; |
| 264 | *fp = (struct i386_frame *) ebp; |
| 265 | } |
| 266 | |
| 267 | void |
| 268 | db_stack_trace_cmd(addr, have_addr, count, modif) |
| 269 | db_expr_t addr; |
| 270 | boolean_t have_addr; |
| 271 | db_expr_t count; |
| 272 | char *modif; |
| 273 | { |
| 274 | struct i386_frame *frame; |
| 275 | int *argp; |
| 276 | db_addr_t callpc; |
| 277 | boolean_t first; |
| 278 | struct pcb *pcb; |
| 279 | struct proc *p; |
| 280 | pid_t pid; |
| 281 | |
| 282 | if (count == -1) |
| 283 | count = 1024; |
| 284 | |
| 285 | if (!have_addr) { |
| 286 | frame = (struct i386_frame *)ddb_regs.tf_ebp; |
| 287 | if (frame == NULL) |
| 288 | frame = (struct i386_frame *)(ddb_regs.tf_esp - 4); |
| 289 | callpc = (db_addr_t)ddb_regs.tf_eip; |
| 290 | } else if (!INKERNEL(addr)) { |
| 291 | pid = (addr % 16) + ((addr >> 4) % 16) * 10 + |
| 292 | ((addr >> 8) % 16) * 100 + ((addr >> 12) % 16) * 1000 + |
| 293 | ((addr >> 16) % 16) * 10000; |
| 294 | /* |
| 295 | * The pcb for curproc is not valid at this point, |
| 296 | * so fall back to the default case. |
| 297 | */ |
| 298 | if ((curproc != NULL) && (pid == curproc->p_pid)) { |
| 299 | frame = (struct i386_frame *)ddb_regs.tf_ebp; |
| 300 | if (frame == NULL) |
| 301 | frame = (struct i386_frame *) |
| 302 | (ddb_regs.tf_esp - 4); |
| 303 | callpc = (db_addr_t)ddb_regs.tf_eip; |
| 304 | } else { |
| 305 | |
| 306 | /* sx_slock(&allproc_lock); */ |
| 307 | FOREACH_PROC_IN_SYSTEM(p) { |
| 308 | if (p->p_pid == pid) |
| 309 | break; |
| 310 | } |
| 311 | /* sx_sunlock(&allproc_lock); */ |
| 312 | if (p == NULL) { |
| 313 | db_printf("pid %d not found\n", pid); |
| 314 | return; |
| 315 | } |
| 316 | if ((p->p_flag & P_INMEM) == 0) { |
| 317 | db_printf("pid %d swapped out\n", pid); |
| 318 | return; |
| 319 | } |
| 320 | pcb = p->p_thread->td_pcb; |
| 321 | frame = (struct i386_frame *)pcb->pcb_ebp; |
| 322 | if (frame == NULL) |
| 323 | frame = (struct i386_frame *) |
| 324 | (pcb->pcb_esp - 4); |
| 325 | callpc = (db_addr_t)pcb->pcb_eip; |
| 326 | } |
| 327 | } else { |
| 328 | frame = (struct i386_frame *)addr; |
| 329 | callpc = (db_addr_t)db_get_value((int)&frame->f_retaddr, 4, FALSE); |
| 330 | } |
| 331 | |
| 332 | first = TRUE; |
| 333 | while (count--) { |
| 334 | struct i386_frame *actframe; |
| 335 | int narg; |
| 336 | const char * name; |
| 337 | db_expr_t offset; |
| 338 | c_db_sym_t sym; |
| 339 | #define MAXNARG 16 |
| 340 | char *argnames[MAXNARG], **argnp = NULL; |
| 341 | |
| 342 | sym = db_search_symbol(callpc, DB_STGY_ANY, &offset); |
| 343 | db_symbol_values(sym, &name, NULL); |
| 344 | |
| 345 | /* |
| 346 | * Attempt to determine a (possibly fake) frame that gives |
| 347 | * the caller's pc. It may differ from `frame' if the |
| 348 | * current function never sets up a standard frame or hasn't |
| 349 | * set one up yet or has just discarded one. The last two |
| 350 | * cases can be guessed fairly reliably for code generated |
| 351 | * by gcc. The first case is too much trouble to handle in |
| 352 | * general because the amount of junk on the stack depends |
| 353 | * on the pc (the special handling of "calltrap", etc. in |
| 354 | * db_nextframe() works because the `next' pc is special). |
| 355 | */ |
| 356 | actframe = frame; |
| 357 | if (first) { |
| 358 | if (!have_addr) { |
| 359 | int instr; |
| 360 | |
| 361 | instr = db_get_value(callpc, 4, FALSE); |
| 362 | if ((instr & 0x00ffffff) == 0x00e58955) { |
| 363 | /* pushl %ebp; movl %esp, %ebp */ |
| 364 | actframe = (struct i386_frame *) |
| 365 | (ddb_regs.tf_esp - 4); |
| 366 | } else if ((instr & 0x0000ffff) == 0x0000e589) { |
| 367 | /* movl %esp, %ebp */ |
| 368 | actframe = (struct i386_frame *) |
| 369 | ddb_regs.tf_esp; |
| 370 | if (ddb_regs.tf_ebp == 0) { |
| 371 | /* Fake caller's frame better. */ |
| 372 | frame = actframe; |
| 373 | } |
| 374 | } else if ((instr & 0x000000ff) == 0x000000c3) { |
| 375 | /* ret */ |
| 376 | actframe = (struct i386_frame *) |
| 377 | (ddb_regs.tf_esp - 4); |
| 378 | } else if (offset == 0) { |
| 379 | /* Probably a symbol in assembler code. */ |
| 380 | actframe = (struct i386_frame *) |
| 381 | (ddb_regs.tf_esp - 4); |
| 382 | } |
| 383 | } else if (!strcmp(name, "fork_trampoline")) { |
| 384 | /* |
| 385 | * Don't try to walk back on a stack for a |
| 386 | * process that hasn't actually been run yet. |
| 387 | */ |
| 388 | db_print_stack_entry(name, 0, 0, 0, callpc); |
| 389 | break; |
| 390 | } |
| 391 | first = FALSE; |
| 392 | } |
| 393 | |
| 394 | argp = &actframe->f_arg0; |
| 395 | narg = MAXNARG; |
| 396 | if (sym != NULL && db_sym_numargs(sym, &narg, argnames)) { |
| 397 | argnp = argnames; |
| 398 | } else { |
| 399 | narg = db_numargs(frame); |
| 400 | } |
| 401 | |
| 402 | db_print_stack_entry(name, narg, argnp, argp, callpc); |
| 403 | |
| 404 | if (actframe != frame) { |
| 405 | /* `frame' belongs to caller. */ |
| 406 | callpc = (db_addr_t) |
| 407 | db_get_value((int)&actframe->f_retaddr, 4, FALSE); |
| 408 | continue; |
| 409 | } |
| 410 | |
| 411 | db_nextframe(&frame, &callpc); |
| 412 | |
| 413 | if (INKERNEL((int) callpc) && !INKERNEL((int) frame)) { |
| 414 | sym = db_search_symbol(callpc, DB_STGY_ANY, &offset); |
| 415 | db_symbol_values(sym, &name, NULL); |
| 416 | db_print_stack_entry(name, 0, 0, 0, callpc); |
| 417 | break; |
| 418 | } |
| 419 | if (!INKERNEL((int) frame)) { |
| 420 | break; |
| 421 | } |
| 422 | } |
| 423 | } |
| 424 | |
| 425 | void |
| 426 | db_print_backtrace(void) |
| 427 | { |
| 428 | register_t ebp; |
| 429 | |
| 430 | __asm __volatile("movl %%ebp, %0" : "=r" (ebp)); |
| 431 | db_stack_trace_cmd(ebp, 1, -1, NULL); |
| 432 | } |
| 433 | |
| 434 | #define DB_DRX_FUNC(reg) \ |
| 435 | int \ |
| 436 | db_ ## reg (vp, valuep, op) \ |
| 437 | struct db_variable *vp; \ |
| 438 | db_expr_t * valuep; \ |
| 439 | int op; \ |
| 440 | { \ |
| 441 | if (op == DB_VAR_GET) \ |
| 442 | *valuep = r ## reg (); \ |
| 443 | else \ |
| 444 | load_ ## reg (*valuep); \ |
| 445 | \ |
| 446 | return(0); \ |
| 447 | } |
| 448 | |
| 449 | DB_DRX_FUNC(dr0) |
| 450 | DB_DRX_FUNC(dr1) |
| 451 | DB_DRX_FUNC(dr2) |
| 452 | DB_DRX_FUNC(dr3) |
| 453 | DB_DRX_FUNC(dr4) |
| 454 | DB_DRX_FUNC(dr5) |
| 455 | DB_DRX_FUNC(dr6) |
| 456 | DB_DRX_FUNC(dr7) |
| 457 | |
| 458 | |
| 459 | |
| 460 | int |
| 461 | i386_set_watch(watchnum, watchaddr, size, access, d) |
| 462 | int watchnum; |
| 463 | unsigned int watchaddr; |
| 464 | int size; |
| 465 | int access; |
| 466 | struct dbreg * d; |
| 467 | { |
| 468 | int i; |
| 469 | unsigned int mask; |
| 470 | |
| 471 | if (watchnum == -1) { |
| 472 | for (i = 0, mask = 0x3; i < 4; i++, mask <<= 2) |
| 473 | if ((d->dr7 & mask) == 0) |
| 474 | break; |
| 475 | if (i < 4) |
| 476 | watchnum = i; |
| 477 | else |
| 478 | return (-1); |
| 479 | } |
| 480 | |
| 481 | switch (access) { |
| 482 | case DBREG_DR7_EXEC: |
| 483 | size = 1; /* size must be 1 for an execution breakpoint */ |
| 484 | /* fall through */ |
| 485 | case DBREG_DR7_WRONLY: |
| 486 | case DBREG_DR7_RDWR: |
| 487 | break; |
| 488 | default : return (-1); break; |
| 489 | } |
| 490 | |
| 491 | /* |
| 492 | * we can watch a 1, 2, or 4 byte sized location |
| 493 | */ |
| 494 | switch (size) { |
| 495 | case 1 : mask = 0x00; break; |
| 496 | case 2 : mask = 0x01 << 2; break; |
| 497 | case 4 : mask = 0x03 << 2; break; |
| 498 | default : return (-1); break; |
| 499 | } |
| 500 | |
| 501 | mask |= access; |
| 502 | |
| 503 | /* clear the bits we are about to affect */ |
| 504 | d->dr7 &= ~((0x3 << (watchnum*2)) | (0x0f << (watchnum*4+16))); |
| 505 | |
| 506 | /* set drN register to the address, N=watchnum */ |
| 507 | DBREG_DRX(d,watchnum) = watchaddr; |
| 508 | |
| 509 | /* enable the watchpoint */ |
| 510 | d->dr7 |= (0x2 << (watchnum*2)) | (mask << (watchnum*4+16)); |
| 511 | |
| 512 | return (watchnum); |
| 513 | } |
| 514 | |
| 515 | |
| 516 | int |
| 517 | i386_clr_watch(watchnum, d) |
| 518 | int watchnum; |
| 519 | struct dbreg * d; |
| 520 | { |
| 521 | |
| 522 | if (watchnum < 0 || watchnum >= 4) |
| 523 | return (-1); |
| 524 | |
| 525 | d->dr7 = d->dr7 & ~((0x3 << (watchnum*2)) | (0x0f << (watchnum*4+16))); |
| 526 | DBREG_DRX(d,watchnum) = 0; |
| 527 | |
| 528 | return (0); |
| 529 | } |
| 530 | |
| 531 | |
| 532 | int |
| 533 | db_md_set_watchpoint(addr, size) |
| 534 | db_expr_t addr; |
| 535 | db_expr_t size; |
| 536 | { |
| 537 | int avail, wsize; |
| 538 | int i; |
| 539 | struct dbreg d; |
| 540 | |
| 541 | fill_dbregs(NULL, &d); |
| 542 | |
| 543 | avail = 0; |
| 544 | for(i=0; i<4; i++) { |
| 545 | if ((d.dr7 & (3 << (i*2))) == 0) |
| 546 | avail++; |
| 547 | } |
| 548 | |
| 549 | if (avail*4 < size) |
| 550 | return (-1); |
| 551 | |
| 552 | for (i=0; i<4 && (size != 0); i++) { |
| 553 | if ((d.dr7 & (3<<(i*2))) == 0) { |
| 554 | if (size > 4) |
| 555 | wsize = 4; |
| 556 | else |
| 557 | wsize = size; |
| 558 | if (wsize == 3) |
| 559 | wsize++; |
| 560 | i386_set_watch(i, addr, wsize, |
| 561 | DBREG_DR7_WRONLY, &d); |
| 562 | addr += wsize; |
| 563 | size -= wsize; |
| 564 | } |
| 565 | } |
| 566 | |
| 567 | set_dbregs(NULL, &d); |
| 568 | |
| 569 | return(0); |
| 570 | } |
| 571 | |
| 572 | |
| 573 | int |
| 574 | db_md_clr_watchpoint(addr, size) |
| 575 | db_expr_t addr; |
| 576 | db_expr_t size; |
| 577 | { |
| 578 | int i; |
| 579 | struct dbreg d; |
| 580 | |
| 581 | fill_dbregs(NULL, &d); |
| 582 | |
| 583 | for(i=0; i<4; i++) { |
| 584 | if (d.dr7 & (3 << (i*2))) { |
| 585 | if ((DBREG_DRX((&d), i) >= addr) && |
| 586 | (DBREG_DRX((&d), i) < addr+size)) |
| 587 | i386_clr_watch(i, &d); |
| 588 | |
| 589 | } |
| 590 | } |
| 591 | |
| 592 | set_dbregs(NULL, &d); |
| 593 | |
| 594 | return(0); |
| 595 | } |
| 596 | |
| 597 | |
| 598 | static |
| 599 | char * |
| 600 | watchtype_str(type) |
| 601 | int type; |
| 602 | { |
| 603 | switch (type) { |
| 604 | case DBREG_DR7_EXEC : return "execute"; break; |
| 605 | case DBREG_DR7_RDWR : return "read/write"; break; |
| 606 | case DBREG_DR7_WRONLY : return "write"; break; |
| 607 | default : return "invalid"; break; |
| 608 | } |
| 609 | } |
| 610 | |
| 611 | |
| 612 | void |
| 613 | db_md_list_watchpoints() |
| 614 | { |
| 615 | int i; |
| 616 | struct dbreg d; |
| 617 | |
| 618 | fill_dbregs(NULL, &d); |
| 619 | |
| 620 | db_printf("\nhardware watchpoints:\n"); |
| 621 | db_printf(" watch status type len address\n" |
| 622 | " ----- -------- ---------- --- ----------\n"); |
| 623 | for (i=0; i<4; i++) { |
| 624 | if (d.dr7 & (0x03 << (i*2))) { |
| 625 | unsigned type, len; |
| 626 | type = (d.dr7 >> (16+(i*4))) & 3; |
| 627 | len = (d.dr7 >> (16+(i*4)+2)) & 3; |
| 628 | db_printf(" %-5d %-8s %10s %3d 0x%08x\n", |
| 629 | i, "enabled", watchtype_str(type), |
| 630 | len+1, DBREG_DRX((&d),i)); |
| 631 | } |
| 632 | else { |
| 633 | db_printf(" %-5d disabled\n", i); |
| 634 | } |
| 635 | } |
| 636 | |
| 637 | db_printf("\ndebug register values:\n"); |
| 638 | for (i=0; i<8; i++) { |
| 639 | db_printf(" dr%d 0x%08x\n", i, DBREG_DRX((&d),i)); |
| 640 | } |
| 641 | db_printf("\n"); |
| 642 | } |
| 643 | |
| 644 | |