| 1 | /* |
| 2 | * Copyright (c) 2008 The DragonFly Project. All rights reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 7 | * |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in |
| 12 | * the documentation and/or other materials provided with the |
| 13 | * distribution. |
| 14 | * 3. Neither the name of The DragonFly Project nor the names of its |
| 15 | * contributors may be used to endorse or promote products derived |
| 16 | * from this software without specific, prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 19 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 20 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 21 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 22 | * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 23 | * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 24 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 25 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| 26 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 27 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 28 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 29 | * SUCH DAMAGE. |
| 30 | * |
| 31 | * -- |
| 32 | * |
| 33 | * Mach Operating System |
| 34 | * Copyright (c) 1991,1990 Carnegie Mellon University |
| 35 | * All Rights Reserved. |
| 36 | * |
| 37 | * Permission to use, copy, modify and distribute this software and its |
| 38 | * documentation is hereby granted, provided that both the copyright |
| 39 | * notice and this permission notice appear in all copies of the |
| 40 | * software, derivative works or modified versions, and any portions |
| 41 | * thereof, and that both notices appear in supporting documentation. |
| 42 | * |
| 43 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS |
| 44 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR |
| 45 | * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. |
| 46 | * |
| 47 | * Carnegie Mellon requests users of this software to return to |
| 48 | * |
| 49 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU |
| 50 | * School of Computer Science |
| 51 | * Carnegie Mellon University |
| 52 | * Pittsburgh PA 15213-3890 |
| 53 | * |
| 54 | * any improvements or extensions that they make and grant Carnegie the |
| 55 | * rights to redistribute these changes. |
| 56 | * |
| 57 | * $FreeBSD: src/sys/i386/i386/db_trace.c,v 1.35.2.3 2002/02/21 22:31:25 silby Exp $ |
| 58 | * $DragonFly: src/sys/platform/pc64/amd64/db_trace.c,v 1.3 2008/08/29 17:07:10 dillon Exp $ |
| 59 | */ |
| 60 | |
| 61 | #include <sys/param.h> |
| 62 | #include <sys/systm.h> |
| 63 | #include <sys/linker_set.h> |
| 64 | #include <sys/lock.h> |
| 65 | #include <sys/proc.h> |
| 66 | #include <sys/reg.h> |
| 67 | |
| 68 | #include <machine/cpu.h> |
| 69 | #include <machine/md_var.h> |
| 70 | |
| 71 | #include <vm/vm.h> |
| 72 | #include <vm/vm_param.h> |
| 73 | #include <vm/pmap.h> |
| 74 | #include <vm/vm_map.h> |
| 75 | #include <ddb/ddb.h> |
| 76 | #include <dlfcn.h> /* DLL */ |
| 77 | |
| 78 | #include <sys/user.h> |
| 79 | |
| 80 | #include <ddb/db_access.h> |
| 81 | #include <ddb/db_sym.h> |
| 82 | #include <ddb/db_variables.h> |
| 83 | |
| 84 | db_varfcn_t db_dr0; |
| 85 | db_varfcn_t db_dr1; |
| 86 | db_varfcn_t db_dr2; |
| 87 | db_varfcn_t db_dr3; |
| 88 | db_varfcn_t db_dr4; |
| 89 | db_varfcn_t db_dr5; |
| 90 | db_varfcn_t db_dr6; |
| 91 | db_varfcn_t db_dr7; |
| 92 | |
| 93 | /* |
| 94 | * Machine register set. |
| 95 | */ |
| 96 | struct db_variable db_regs[] = { |
| 97 | { "cs", &ddb_regs.tf_cs, NULL }, |
| 98 | /* { "ds", &ddb_regs.tf_ds, NULL }, |
| 99 | { "es", &ddb_regs.tf_es, NULL }, |
| 100 | { "fs", &ddb_regs.tf_fs, NULL }, |
| 101 | { "gs", &ddb_regs.tf_gs, NULL }, */ |
| 102 | { "ss", &ddb_regs.tf_ss, NULL }, |
| 103 | { "rax", &ddb_regs.tf_rax, NULL }, |
| 104 | { "rcx", &ddb_regs.tf_rcx, NULL }, |
| 105 | { "rdx", &ddb_regs.tf_rdx, NULL }, |
| 106 | { "rbx", &ddb_regs.tf_rbx, NULL }, |
| 107 | { "rsp", &ddb_regs.tf_rsp, NULL }, |
| 108 | { "rbp", &ddb_regs.tf_rbp, NULL }, |
| 109 | { "rsi", &ddb_regs.tf_rsi, NULL }, |
| 110 | { "rdi", &ddb_regs.tf_rdi, NULL }, |
| 111 | { "rip", &ddb_regs.tf_rip, NULL }, |
| 112 | { "rfl", &ddb_regs.tf_rflags, NULL }, |
| 113 | { "r8", &ddb_regs.tf_r8, NULL }, |
| 114 | { "r9", &ddb_regs.tf_r9, NULL }, |
| 115 | { "r10", &ddb_regs.tf_r10, NULL }, |
| 116 | { "r11", &ddb_regs.tf_r11, NULL }, |
| 117 | { "r12", &ddb_regs.tf_r12, NULL }, |
| 118 | { "r13", &ddb_regs.tf_r13, NULL }, |
| 119 | { "r14", &ddb_regs.tf_r14, NULL }, |
| 120 | { "r15", &ddb_regs.tf_r15, NULL }, |
| 121 | { "dr0", NULL, db_dr0 }, |
| 122 | { "dr1", NULL, db_dr1 }, |
| 123 | { "dr2", NULL, db_dr2 }, |
| 124 | { "dr3", NULL, db_dr3 }, |
| 125 | { "dr4", NULL, db_dr4 }, |
| 126 | { "dr5", NULL, db_dr5 }, |
| 127 | { "dr6", NULL, db_dr6 }, |
| 128 | { "dr7", NULL, db_dr7 }, |
| 129 | }; |
| 130 | struct db_variable *db_eregs = db_regs + sizeof(db_regs)/sizeof(db_regs[0]); |
| 131 | |
| 132 | /* |
| 133 | * Stack trace. |
| 134 | */ |
| 135 | #define INKERNEL(va) (((vm_offset_t)(va)) >= USRSTACK) |
| 136 | |
| 137 | struct amd64_frame { |
| 138 | struct amd64_frame *f_frame; |
| 139 | long f_retaddr; |
| 140 | long f_arg0; |
| 141 | }; |
| 142 | |
| 143 | #define NORMAL 0 |
| 144 | #define TRAP 1 |
| 145 | #define INTERRUPT 2 |
| 146 | #define SYSCALL 3 |
| 147 | |
| 148 | static void db_nextframe(struct amd64_frame **, db_addr_t *); |
| 149 | static int db_numargs(struct amd64_frame *); |
| 150 | static void db_print_stack_entry(const char *, int, char **, long *, db_addr_t); |
| 151 | static void dl_symbol_values(long callpc, const char **name); |
| 152 | |
| 153 | |
| 154 | static char *watchtype_str(int type); |
| 155 | static int kamd64_set_watch(int watchnum, unsigned int watchaddr, |
| 156 | int size, int access, struct dbreg * d); |
| 157 | static int kamd64_clr_watch(int watchnum, struct dbreg * d); |
| 158 | int db_md_set_watchpoint(db_expr_t addr, db_expr_t size); |
| 159 | int db_md_clr_watchpoint(db_expr_t addr, db_expr_t size); |
| 160 | void db_md_list_watchpoints(void); |
| 161 | |
| 162 | |
| 163 | /* |
| 164 | * Figure out how many arguments were passed into the frame at "fp". |
| 165 | */ |
| 166 | static int |
| 167 | db_numargs(struct amd64_frame *fp) |
| 168 | { |
| 169 | #if 1 |
| 170 | return (0); /* regparm, needs dwarf2 info */ |
| 171 | #else |
| 172 | int args; |
| 173 | #if 0 |
| 174 | int *argp; |
| 175 | int inst; |
| 176 | |
| 177 | argp = (int *)db_get_value((int)&fp->f_retaddr, 4, FALSE); |
| 178 | /* |
| 179 | * XXX etext is wrong for LKMs. We should attempt to interpret |
| 180 | * the instruction at the return address in all cases. This |
| 181 | * may require better fault handling. |
| 182 | */ |
| 183 | if (argp < (int *)btext || argp >= (int *)etext) { |
| 184 | args = 5; |
| 185 | } else { |
| 186 | inst = db_get_value((int)argp, 4, FALSE); |
| 187 | if ((inst & 0xff) == 0x59) /* popl %ecx */ |
| 188 | args = 1; |
| 189 | else if ((inst & 0xffff) == 0xc483) /* addl $Ibs, %esp */ |
| 190 | args = ((inst >> 16) & 0xff) / 4; |
| 191 | else |
| 192 | args = 5; |
| 193 | } |
| 194 | #endif |
| 195 | args = 5; |
| 196 | return(args); |
| 197 | #endif |
| 198 | } |
| 199 | |
| 200 | static void |
| 201 | db_print_stack_entry(const char *name, int narg, char **argnp, long *argp, |
| 202 | db_addr_t callpc) |
| 203 | { |
| 204 | db_printf("%s(", name); |
| 205 | while (narg) { |
| 206 | if (argnp) |
| 207 | db_printf("%s=", *argnp++); |
| 208 | db_printf("%ld", (long)db_get_value((long)argp, 8, FALSE)); |
| 209 | argp++; |
| 210 | if (--narg != 0) |
| 211 | db_printf(","); |
| 212 | } |
| 213 | db_printf(") at "); |
| 214 | db_printsym(callpc, DB_STGY_PROC); |
| 215 | db_printf("\n"); |
| 216 | } |
| 217 | |
| 218 | /* |
| 219 | * Figure out the next frame up in the call stack. |
| 220 | */ |
| 221 | static void |
| 222 | db_nextframe(struct amd64_frame **fp, db_addr_t *ip) |
| 223 | { |
| 224 | struct trapframe *tf; |
| 225 | int frame_type; |
| 226 | long rip, rsp, rbp; |
| 227 | db_expr_t offset; |
| 228 | const char *sym, *name; |
| 229 | |
| 230 | rip = db_get_value((long) &(*fp)->f_retaddr, 8, FALSE); |
| 231 | rbp = db_get_value((long) &(*fp)->f_frame, 8, FALSE); |
| 232 | |
| 233 | /* |
| 234 | * Figure out frame type. |
| 235 | */ |
| 236 | |
| 237 | frame_type = NORMAL; |
| 238 | |
| 239 | sym = db_search_symbol(rip, DB_STGY_ANY, &offset); |
| 240 | db_symbol_values(sym, &name, NULL); |
| 241 | dl_symbol_values(rip, &name); |
| 242 | if (name != NULL) { |
| 243 | if (!strcmp(name, "calltrap")) { |
| 244 | frame_type = TRAP; |
| 245 | } else if (!strncmp(name, "Xresume", 7)) { |
| 246 | frame_type = INTERRUPT; |
| 247 | } else if (!strcmp(name, "_Xsyscall")) { |
| 248 | frame_type = SYSCALL; |
| 249 | } |
| 250 | } |
| 251 | |
| 252 | /* |
| 253 | * Normal frames need no special processing. |
| 254 | */ |
| 255 | if (frame_type == NORMAL) { |
| 256 | *ip = (db_addr_t) rip; |
| 257 | *fp = (struct amd64_frame *) rbp; |
| 258 | return; |
| 259 | } |
| 260 | |
| 261 | db_print_stack_entry(name, 0, 0, 0, rip); |
| 262 | |
| 263 | /* |
| 264 | * Point to base of trapframe which is just above the |
| 265 | * current frame. |
| 266 | */ |
| 267 | tf = (struct trapframe *)((long)*fp + 16); |
| 268 | |
| 269 | #if 0 |
| 270 | rsp = (ISPL(tf->tf_cs) == SEL_UPL) ? tf->tf_rsp : (long)&tf->tf_rsp; |
| 271 | #endif |
| 272 | rsp = (long)&tf->tf_rsp; |
| 273 | |
| 274 | switch (frame_type) { |
| 275 | case TRAP: |
| 276 | { |
| 277 | rip = tf->tf_rip; |
| 278 | rbp = tf->tf_rbp; |
| 279 | db_printf( |
| 280 | "--- trap %016lx, rip = %016lx, rsp = %016lx, rbp = %016lx ---\n", |
| 281 | tf->tf_trapno, rip, rsp, rbp); |
| 282 | } |
| 283 | break; |
| 284 | case SYSCALL: |
| 285 | { |
| 286 | rip = tf->tf_rip; |
| 287 | rbp = tf->tf_rbp; |
| 288 | db_printf( |
| 289 | "--- syscall %016lx, rip = %016lx, rsp = %016lx, rbp = %016lx ---\n", |
| 290 | tf->tf_rax, rip, rsp, rbp); |
| 291 | } |
| 292 | break; |
| 293 | case INTERRUPT: |
| 294 | tf = (struct trapframe *)((long)*fp + 16); |
| 295 | { |
| 296 | rip = tf->tf_rip; |
| 297 | rbp = tf->tf_rbp; |
| 298 | db_printf( |
| 299 | "--- interrupt, rip = %016lx, rsp = %016lx, rbp = %016lx ---\n", |
| 300 | rip, rsp, rbp); |
| 301 | } |
| 302 | break; |
| 303 | default: |
| 304 | break; |
| 305 | } |
| 306 | |
| 307 | *ip = (db_addr_t) rip; |
| 308 | *fp = (struct amd64_frame *) rbp; |
| 309 | } |
| 310 | |
| 311 | void |
| 312 | db_stack_trace_cmd(db_expr_t addr, boolean_t have_addr, db_expr_t count, |
| 313 | char *modif) |
| 314 | { |
| 315 | struct amd64_frame *frame; |
| 316 | long *argp; |
| 317 | db_addr_t callpc; |
| 318 | boolean_t first; |
| 319 | int i; |
| 320 | |
| 321 | if (count == -1) |
| 322 | count = 1024; |
| 323 | |
| 324 | if (!have_addr) { |
| 325 | frame = (struct amd64_frame *)BP_REGS(&ddb_regs); |
| 326 | if (frame == NULL) |
| 327 | frame = (struct amd64_frame *)(SP_REGS(&ddb_regs) - 8); |
| 328 | callpc = PC_REGS(&ddb_regs); |
| 329 | } else { |
| 330 | /* |
| 331 | * Look for something that might be a frame pointer, just as |
| 332 | * a convenience. |
| 333 | */ |
| 334 | frame = (struct amd64_frame *)addr; |
| 335 | for (i = 0; i < 4096; i += 8) { |
| 336 | struct amd64_frame *check; |
| 337 | |
| 338 | check = (struct amd64_frame *)db_get_value((long)((char *)&frame->f_frame + i), 8, FALSE); |
| 339 | if ((char *)check - (char *)frame >= 0 && |
| 340 | (char *)check - (char *)frame < 4096 |
| 341 | ) { |
| 342 | break; |
| 343 | } |
| 344 | db_printf("%p does not look like a stack frame, skipping\n", (char *)&frame->f_frame + i); |
| 345 | } |
| 346 | if (i == 4096) { |
| 347 | db_printf("Unable to find anything that looks like a stack frame\n"); |
| 348 | return; |
| 349 | } |
| 350 | frame = (void *)((char *)frame + i); |
| 351 | db_printf("Trace beginning at frame %p\n", frame); |
| 352 | callpc = (db_addr_t)db_get_value((long)&frame->f_retaddr, 8, FALSE); |
| 353 | } |
| 354 | |
| 355 | first = TRUE; |
| 356 | while (count--) { |
| 357 | struct amd64_frame *actframe; |
| 358 | int narg; |
| 359 | const char * name; |
| 360 | db_expr_t offset; |
| 361 | c_db_sym_t sym; |
| 362 | #define MAXNARG 16 |
| 363 | char *argnames[MAXNARG], **argnp = NULL; |
| 364 | |
| 365 | sym = db_search_symbol(callpc, DB_STGY_ANY, &offset); |
| 366 | db_symbol_values(sym, &name, NULL); |
| 367 | dl_symbol_values(callpc, &name); |
| 368 | |
| 369 | /* |
| 370 | * Attempt to determine a (possibly fake) frame that gives |
| 371 | * the caller's pc. It may differ from `frame' if the |
| 372 | * current function never sets up a standard frame or hasn't |
| 373 | * set one up yet or has just discarded one. The last two |
| 374 | * cases can be guessed fairly reliably for code generated |
| 375 | * by gcc. The first case is too much trouble to handle in |
| 376 | * general because the amount of junk on the stack depends |
| 377 | * on the pc (the special handling of "calltrap", etc. in |
| 378 | * db_nextframe() works because the `next' pc is special). |
| 379 | */ |
| 380 | actframe = frame; |
| 381 | if (first) { |
| 382 | if (!have_addr) { |
| 383 | int instr; |
| 384 | |
| 385 | instr = db_get_value(callpc, 4, FALSE); |
| 386 | if ((instr & 0xffffffff) == 0xe5894855) { |
| 387 | /* pushq %rbp; movq %rsp, %rbp */ |
| 388 | actframe = (struct amd64_frame *) |
| 389 | (SP_REGS(&ddb_regs) - 8); |
| 390 | } else if ((instr & 0xffffff) == 0xe58948) { |
| 391 | /* movq %rsp, %rbp */ |
| 392 | actframe = (struct amd64_frame *) |
| 393 | SP_REGS(&ddb_regs); |
| 394 | if (ddb_regs.tf_rbp == 0) { |
| 395 | /* Fake caller's frame better. */ |
| 396 | frame = actframe; |
| 397 | } |
| 398 | } else if ((instr & 0xff) == 0xc3) { |
| 399 | /* ret */ |
| 400 | actframe = (struct amd64_frame *) |
| 401 | (SP_REGS(&ddb_regs) - 8); |
| 402 | } else if (offset == 0) { |
| 403 | /* Probably a symbol in assembler code. */ |
| 404 | actframe = (struct amd64_frame *) |
| 405 | (SP_REGS(&ddb_regs) - 8); |
| 406 | } |
| 407 | } else if (name != NULL && |
| 408 | strcmp(name, "fork_trampoline") == 0) { |
| 409 | /* |
| 410 | * Don't try to walk back on a stack for a |
| 411 | * process that hasn't actually been run yet. |
| 412 | */ |
| 413 | db_print_stack_entry(name, 0, 0, 0, callpc); |
| 414 | break; |
| 415 | } |
| 416 | first = FALSE; |
| 417 | } |
| 418 | |
| 419 | argp = &actframe->f_arg0; |
| 420 | narg = MAXNARG; |
| 421 | if (sym != NULL && db_sym_numargs(sym, &narg, argnames)) { |
| 422 | argnp = argnames; |
| 423 | } else { |
| 424 | narg = db_numargs(frame); |
| 425 | } |
| 426 | |
| 427 | db_print_stack_entry(name, narg, argnp, argp, callpc); |
| 428 | |
| 429 | if (actframe != frame) { |
| 430 | /* `frame' belongs to caller. */ |
| 431 | callpc = (db_addr_t) |
| 432 | db_get_value((long)&actframe->f_retaddr, 8, FALSE); |
| 433 | continue; |
| 434 | } |
| 435 | |
| 436 | db_nextframe(&frame, &callpc); |
| 437 | if (frame == 0) |
| 438 | break; |
| 439 | } |
| 440 | } |
| 441 | |
| 442 | void |
| 443 | print_backtrace(void) |
| 444 | { |
| 445 | register_t rbp; |
| 446 | |
| 447 | __asm __volatile("movq %%rbp, %0" : "=r" (rbp)); |
| 448 | db_stack_trace_cmd(rbp, 1, -1, NULL); |
| 449 | } |
| 450 | |
| 451 | #define DB_DRX_FUNC(reg) \ |
| 452 | int \ |
| 453 | db_ ## reg (struct db_variable *vp, db_expr_t *valuep, int op) \ |
| 454 | { \ |
| 455 | if (op == DB_VAR_GET) \ |
| 456 | *valuep = r ## reg (); \ |
| 457 | else \ |
| 458 | load_ ## reg (*valuep); \ |
| 459 | \ |
| 460 | return(0); \ |
| 461 | } |
| 462 | |
| 463 | DB_DRX_FUNC(dr0) |
| 464 | DB_DRX_FUNC(dr1) |
| 465 | DB_DRX_FUNC(dr2) |
| 466 | DB_DRX_FUNC(dr3) |
| 467 | DB_DRX_FUNC(dr4) |
| 468 | DB_DRX_FUNC(dr5) |
| 469 | DB_DRX_FUNC(dr6) |
| 470 | DB_DRX_FUNC(dr7) |
| 471 | |
| 472 | static int |
| 473 | kamd64_set_watch(int watchnum, unsigned int watchaddr, int size, int access, |
| 474 | struct dbreg *d) |
| 475 | { |
| 476 | int i; |
| 477 | unsigned int mask; |
| 478 | |
| 479 | if (watchnum == -1) { |
| 480 | for (i = 0, mask = 0x3; i < 4; i++, mask <<= 2) |
| 481 | if ((d->dr[7] & mask) == 0) |
| 482 | break; |
| 483 | if (i < 4) |
| 484 | watchnum = i; |
| 485 | else |
| 486 | return(-1); |
| 487 | } |
| 488 | |
| 489 | switch (access) { |
| 490 | case DBREG_DR7_EXEC: |
| 491 | size = 1; /* size must be 1 for an execution breakpoint */ |
| 492 | /* fall through */ |
| 493 | case DBREG_DR7_WRONLY: |
| 494 | case DBREG_DR7_RDWR: |
| 495 | break; |
| 496 | default: |
| 497 | return(-1); |
| 498 | } |
| 499 | |
| 500 | /* |
| 501 | * we can watch a 1, 2, 4, or 8 byte sized location |
| 502 | */ |
| 503 | switch (size) { |
| 504 | case 1: |
| 505 | mask = 0x00; |
| 506 | break; |
| 507 | case 2: |
| 508 | mask = 0x01 << 2; |
| 509 | break; |
| 510 | case 4: |
| 511 | mask = 0x03 << 2; |
| 512 | case 8: |
| 513 | mask = 0x02 << 2; |
| 514 | break; |
| 515 | default: |
| 516 | return(-1); |
| 517 | } |
| 518 | |
| 519 | mask |= access; |
| 520 | |
| 521 | /* clear the bits we are about to affect */ |
| 522 | d->dr[7] &= ~((0x3 << (watchnum * 2)) | (0x0f << (watchnum * 4 + 16))); |
| 523 | |
| 524 | /* set drN register to the address, N=watchnum */ |
| 525 | DBREG_DRX(d, watchnum) = watchaddr; |
| 526 | |
| 527 | /* enable the watchpoint */ |
| 528 | d->dr[7] |= (0x2 << (watchnum * 2)) | (mask << (watchnum * 4 + 16)); |
| 529 | |
| 530 | return(watchnum); |
| 531 | } |
| 532 | |
| 533 | |
| 534 | int |
| 535 | kamd64_clr_watch(int watchnum, struct dbreg *d) |
| 536 | { |
| 537 | if (watchnum < 0 || watchnum >= 4) |
| 538 | return(-1); |
| 539 | |
| 540 | d->dr[7] &= ~((0x3 << (watchnum * 2)) | (0x0f << (watchnum * 4 + 16))); |
| 541 | DBREG_DRX(d, watchnum) = 0; |
| 542 | |
| 543 | return(0); |
| 544 | } |
| 545 | |
| 546 | |
| 547 | int |
| 548 | db_md_set_watchpoint(db_expr_t addr, db_expr_t size) |
| 549 | { |
| 550 | int avail, wsize; |
| 551 | int i; |
| 552 | struct dbreg d; |
| 553 | |
| 554 | fill_dbregs(NULL, &d); |
| 555 | |
| 556 | avail = 0; |
| 557 | for (i = 0; i < 4; i++) { |
| 558 | if ((d.dr[7] & (3 << (i * 2))) == 0) |
| 559 | avail++; |
| 560 | } |
| 561 | |
| 562 | if (avail * 8 < size) |
| 563 | return(-1); |
| 564 | |
| 565 | for (i=0; i < 4 && (size != 0); i++) { |
| 566 | if ((d.dr[7] & (3 << (i * 2))) == 0) { |
| 567 | if (size >= 8 || (avail == 1 && size > 4)) |
| 568 | wsize = 8; |
| 569 | else if (size > 2) |
| 570 | wsize = 4; |
| 571 | else |
| 572 | wsize = size; |
| 573 | if (wsize == 3) |
| 574 | wsize++; |
| 575 | kamd64_set_watch(i, addr, wsize, DBREG_DR7_WRONLY, &d); |
| 576 | addr += wsize; |
| 577 | size -= wsize; |
| 578 | } |
| 579 | } |
| 580 | |
| 581 | set_dbregs(NULL, &d); |
| 582 | |
| 583 | return(0); |
| 584 | } |
| 585 | |
| 586 | int |
| 587 | db_md_clr_watchpoint(db_expr_t addr, db_expr_t size) |
| 588 | { |
| 589 | struct dbreg d; |
| 590 | int i; |
| 591 | |
| 592 | fill_dbregs(NULL, &d); |
| 593 | |
| 594 | for(i = 0; i < 4; i++) { |
| 595 | if (d.dr[7] & (3 << (i * 2))) { |
| 596 | if ((DBREG_DRX((&d), i) >= addr) && |
| 597 | (DBREG_DRX((&d), i) < addr + size)) |
| 598 | kamd64_clr_watch(i, &d); |
| 599 | } |
| 600 | } |
| 601 | |
| 602 | set_dbregs(NULL, &d); |
| 603 | |
| 604 | return(0); |
| 605 | } |
| 606 | |
| 607 | static char * |
| 608 | watchtype_str(int type) |
| 609 | { |
| 610 | switch (type) { |
| 611 | case DBREG_DR7_EXEC: |
| 612 | return "execute"; |
| 613 | case DBREG_DR7_RDWR: |
| 614 | return "read/write"; |
| 615 | case DBREG_DR7_WRONLY: |
| 616 | return "write"; |
| 617 | default: |
| 618 | return "invalid"; |
| 619 | } |
| 620 | } |
| 621 | |
| 622 | void |
| 623 | db_md_list_watchpoints(void) |
| 624 | { |
| 625 | int i; |
| 626 | struct dbreg d; |
| 627 | |
| 628 | fill_dbregs(NULL, &d); |
| 629 | |
| 630 | db_printf("\nhardware watchpoints:\n"); |
| 631 | db_printf(" watch status type len address\n" |
| 632 | " ----- -------- ---------- --- ----------\n"); |
| 633 | for (i = 0; i < 4; i++) { |
| 634 | if (d.dr[7] & (0x03 << (i * 2))) { |
| 635 | unsigned type, len; |
| 636 | type = (d.dr[7] >> (16 + (i * 4))) & 3; |
| 637 | len = (d.dr[7] >> (16 + (i * 4) + 2)) & 3; |
| 638 | db_printf(" %-5d %-8s %10s %3d 0x%08lx\n", |
| 639 | i, "enabled", watchtype_str(type), |
| 640 | len + 1, DBREG_DRX((&d), i)); |
| 641 | } else { |
| 642 | db_printf(" %-5d disabled\n", i); |
| 643 | } |
| 644 | } |
| 645 | |
| 646 | db_printf("\ndebug register values:\n"); |
| 647 | for (i = 0; i < 8; i++) |
| 648 | db_printf(" dr%d 0x%08lx\n", i, DBREG_DRX((&d),i)); |
| 649 | db_printf("\n"); |
| 650 | } |
| 651 | |
| 652 | /* |
| 653 | * See if dladdr() can get the symbol name via the standard dynamic loader. |
| 654 | */ |
| 655 | static |
| 656 | void |
| 657 | dl_symbol_values(long callpc, const char **name) |
| 658 | { |
| 659 | Dl_info info; |
| 660 | |
| 661 | /* |
| 662 | if (*name == NULL) { |
| 663 | if (dladdr((const void *)callpc, &info) != 0) { |
| 664 | if (info.dli_saddr <= (const void *)callpc) |
| 665 | *name = info.dli_sname; |
| 666 | } |
| 667 | } |
| 668 | */ |
| 669 | } |
| 670 | |