| 1 | /* Memory breakpoint operations for the remote server for GDB. |
| 2 | Copyright (C) 2002-2020 Free Software Foundation, Inc. |
| 3 | |
| 4 | Contributed by MontaVista Software. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #include "server.h" |
| 22 | #include "regcache.h" |
| 23 | #include "ax.h" |
| 24 | |
| 25 | #define MAX_BREAKPOINT_LEN 8 |
| 26 | |
| 27 | /* Helper macro used in loops that append multiple items to a singly-linked |
| 28 | list instead of inserting items at the head of the list, as, say, in the |
| 29 | breakpoint lists. LISTPP is a pointer to the pointer that is the head of |
| 30 | the new list. ITEMP is a pointer to the item to be added to the list. |
| 31 | TAILP must be defined to be the same type as ITEMP, and initialized to |
| 32 | NULL. */ |
| 33 | |
| 34 | #define APPEND_TO_LIST(listpp, itemp, tailp) \ |
| 35 | do \ |
| 36 | { \ |
| 37 | if ((tailp) == NULL) \ |
| 38 | *(listpp) = (itemp); \ |
| 39 | else \ |
| 40 | (tailp)->next = (itemp); \ |
| 41 | (tailp) = (itemp); \ |
| 42 | } \ |
| 43 | while (0) |
| 44 | |
| 45 | /* GDB will never try to install multiple breakpoints at the same |
| 46 | address. However, we can see GDB requesting to insert a breakpoint |
| 47 | at an address is had already inserted one previously in a few |
| 48 | situations. |
| 49 | |
| 50 | - The RSP documentation on Z packets says that to avoid potential |
| 51 | problems with duplicate packets, the operations should be |
| 52 | implemented in an idempotent way. |
| 53 | |
| 54 | - A breakpoint is set at ADDR, an address in a shared library. |
| 55 | Then the shared library is unloaded. And then another, unrelated, |
| 56 | breakpoint at ADDR is set. There is not breakpoint removal request |
| 57 | between the first and the second breakpoint. |
| 58 | |
| 59 | - When GDB wants to update the target-side breakpoint conditions or |
| 60 | commands, it re-inserts the breakpoint, with updated |
| 61 | conditions/commands associated. |
| 62 | |
| 63 | Also, we need to keep track of internal breakpoints too, so we do |
| 64 | need to be able to install multiple breakpoints at the same address |
| 65 | transparently. |
| 66 | |
| 67 | We keep track of two different, and closely related structures. A |
| 68 | raw breakpoint, which manages the low level, close to the metal |
| 69 | aspect of a breakpoint. It holds the breakpoint address, and for |
| 70 | software breakpoints, a buffer holding a copy of the instructions |
| 71 | that would be in memory had not been a breakpoint there (we call |
| 72 | that the shadow memory of the breakpoint). We occasionally need to |
| 73 | temporarilly uninsert a breakpoint without the client knowing about |
| 74 | it (e.g., to step over an internal breakpoint), so we keep an |
| 75 | `inserted' state associated with this low level breakpoint |
| 76 | structure. There can only be one such object for a given address. |
| 77 | Then, we have (a bit higher level) breakpoints. This structure |
| 78 | holds a callback to be called whenever a breakpoint is hit, a |
| 79 | high-level type, and a link to a low level raw breakpoint. There |
| 80 | can be many high-level breakpoints at the same address, and all of |
| 81 | them will point to the same raw breakpoint, which is reference |
| 82 | counted. */ |
| 83 | |
| 84 | /* The low level, physical, raw breakpoint. */ |
| 85 | struct raw_breakpoint |
| 86 | { |
| 87 | struct raw_breakpoint *next; |
| 88 | |
| 89 | /* The low level type of the breakpoint (software breakpoint, |
| 90 | watchpoint, etc.) */ |
| 91 | enum raw_bkpt_type raw_type; |
| 92 | |
| 93 | /* A reference count. Each high level breakpoint referencing this |
| 94 | raw breakpoint accounts for one reference. */ |
| 95 | int refcount; |
| 96 | |
| 97 | /* The breakpoint's insertion address. There can only be one raw |
| 98 | breakpoint for a given PC. */ |
| 99 | CORE_ADDR pc; |
| 100 | |
| 101 | /* The breakpoint's kind. This is target specific. Most |
| 102 | architectures only use one specific instruction for breakpoints, while |
| 103 | others may use more than one. E.g., on ARM, we need to use different |
| 104 | breakpoint instructions on Thumb, Thumb-2, and ARM code. Likewise for |
| 105 | hardware breakpoints -- some architectures (including ARM) need to |
| 106 | setup debug registers differently depending on mode. */ |
| 107 | int kind; |
| 108 | |
| 109 | /* The breakpoint's shadow memory. */ |
| 110 | unsigned char old_data[MAX_BREAKPOINT_LEN]; |
| 111 | |
| 112 | /* Positive if this breakpoint is currently inserted in the |
| 113 | inferior. Negative if it was, but we've detected that it's now |
| 114 | gone. Zero if not inserted. */ |
| 115 | int inserted; |
| 116 | }; |
| 117 | |
| 118 | /* The type of a breakpoint. */ |
| 119 | enum bkpt_type |
| 120 | { |
| 121 | /* A GDB breakpoint, requested with a Z0 packet. */ |
| 122 | gdb_breakpoint_Z0, |
| 123 | |
| 124 | /* A GDB hardware breakpoint, requested with a Z1 packet. */ |
| 125 | gdb_breakpoint_Z1, |
| 126 | |
| 127 | /* A GDB write watchpoint, requested with a Z2 packet. */ |
| 128 | gdb_breakpoint_Z2, |
| 129 | |
| 130 | /* A GDB read watchpoint, requested with a Z3 packet. */ |
| 131 | gdb_breakpoint_Z3, |
| 132 | |
| 133 | /* A GDB access watchpoint, requested with a Z4 packet. */ |
| 134 | gdb_breakpoint_Z4, |
| 135 | |
| 136 | /* A software single-step breakpoint. */ |
| 137 | single_step_breakpoint, |
| 138 | |
| 139 | /* Any other breakpoint type that doesn't require specific |
| 140 | treatment goes here. E.g., an event breakpoint. */ |
| 141 | other_breakpoint, |
| 142 | }; |
| 143 | |
| 144 | struct point_cond_list |
| 145 | { |
| 146 | /* Pointer to the agent expression that is the breakpoint's |
| 147 | conditional. */ |
| 148 | struct agent_expr *cond; |
| 149 | |
| 150 | /* Pointer to the next condition. */ |
| 151 | struct point_cond_list *next; |
| 152 | }; |
| 153 | |
| 154 | struct point_command_list |
| 155 | { |
| 156 | /* Pointer to the agent expression that is the breakpoint's |
| 157 | commands. */ |
| 158 | struct agent_expr *cmd; |
| 159 | |
| 160 | /* Flag that is true if this command should run even while GDB is |
| 161 | disconnected. */ |
| 162 | int persistence; |
| 163 | |
| 164 | /* Pointer to the next command. */ |
| 165 | struct point_command_list *next; |
| 166 | }; |
| 167 | |
| 168 | /* A high level (in gdbserver's perspective) breakpoint. */ |
| 169 | struct breakpoint |
| 170 | { |
| 171 | struct breakpoint *next; |
| 172 | |
| 173 | /* The breakpoint's type. */ |
| 174 | enum bkpt_type type; |
| 175 | |
| 176 | /* Link to this breakpoint's raw breakpoint. This is always |
| 177 | non-NULL. */ |
| 178 | struct raw_breakpoint *raw; |
| 179 | }; |
| 180 | |
| 181 | /* Breakpoint requested by GDB. */ |
| 182 | |
| 183 | struct gdb_breakpoint |
| 184 | { |
| 185 | struct breakpoint base; |
| 186 | |
| 187 | /* Pointer to the condition list that should be evaluated on |
| 188 | the target or NULL if the breakpoint is unconditional or |
| 189 | if GDB doesn't want us to evaluate the conditionals on the |
| 190 | target's side. */ |
| 191 | struct point_cond_list *cond_list; |
| 192 | |
| 193 | /* Point to the list of commands to run when this is hit. */ |
| 194 | struct point_command_list *command_list; |
| 195 | }; |
| 196 | |
| 197 | /* Breakpoint used by GDBserver. */ |
| 198 | |
| 199 | struct other_breakpoint |
| 200 | { |
| 201 | struct breakpoint base; |
| 202 | |
| 203 | /* Function to call when we hit this breakpoint. If it returns 1, |
| 204 | the breakpoint shall be deleted; 0 or if this callback is NULL, |
| 205 | it will be left inserted. */ |
| 206 | int (*handler) (CORE_ADDR); |
| 207 | }; |
| 208 | |
| 209 | /* Breakpoint for single step. */ |
| 210 | |
| 211 | struct single_step_breakpoint |
| 212 | { |
| 213 | struct breakpoint base; |
| 214 | |
| 215 | /* Thread the reinsert breakpoint belongs to. */ |
| 216 | ptid_t ptid; |
| 217 | }; |
| 218 | |
| 219 | /* Return the breakpoint size from its kind. */ |
| 220 | |
| 221 | static int |
| 222 | bp_size (struct raw_breakpoint *bp) |
| 223 | { |
| 224 | int size = 0; |
| 225 | |
| 226 | the_target->sw_breakpoint_from_kind (bp->kind, &size); |
| 227 | return size; |
| 228 | } |
| 229 | |
| 230 | /* Return the breakpoint opcode from its kind. */ |
| 231 | |
| 232 | static const gdb_byte * |
| 233 | bp_opcode (struct raw_breakpoint *bp) |
| 234 | { |
| 235 | int size = 0; |
| 236 | |
| 237 | return the_target->sw_breakpoint_from_kind (bp->kind, &size); |
| 238 | } |
| 239 | |
| 240 | /* See mem-break.h. */ |
| 241 | |
| 242 | enum target_hw_bp_type |
| 243 | raw_bkpt_type_to_target_hw_bp_type (enum raw_bkpt_type raw_type) |
| 244 | { |
| 245 | switch (raw_type) |
| 246 | { |
| 247 | case raw_bkpt_type_hw: |
| 248 | return hw_execute; |
| 249 | case raw_bkpt_type_write_wp: |
| 250 | return hw_write; |
| 251 | case raw_bkpt_type_read_wp: |
| 252 | return hw_read; |
| 253 | case raw_bkpt_type_access_wp: |
| 254 | return hw_access; |
| 255 | default: |
| 256 | internal_error (__FILE__, __LINE__, |
| 257 | "bad raw breakpoint type %d", (int) raw_type); |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | /* See mem-break.h. */ |
| 262 | |
| 263 | static enum bkpt_type |
| 264 | Z_packet_to_bkpt_type (char z_type) |
| 265 | { |
| 266 | gdb_assert ('0' <= z_type && z_type <= '4'); |
| 267 | |
| 268 | return (enum bkpt_type) (gdb_breakpoint_Z0 + (z_type - '0')); |
| 269 | } |
| 270 | |
| 271 | /* See mem-break.h. */ |
| 272 | |
| 273 | enum raw_bkpt_type |
| 274 | Z_packet_to_raw_bkpt_type (char z_type) |
| 275 | { |
| 276 | switch (z_type) |
| 277 | { |
| 278 | case Z_PACKET_SW_BP: |
| 279 | return raw_bkpt_type_sw; |
| 280 | case Z_PACKET_HW_BP: |
| 281 | return raw_bkpt_type_hw; |
| 282 | case Z_PACKET_WRITE_WP: |
| 283 | return raw_bkpt_type_write_wp; |
| 284 | case Z_PACKET_READ_WP: |
| 285 | return raw_bkpt_type_read_wp; |
| 286 | case Z_PACKET_ACCESS_WP: |
| 287 | return raw_bkpt_type_access_wp; |
| 288 | default: |
| 289 | gdb_assert_not_reached ("unhandled Z packet type."); |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | /* Return true if breakpoint TYPE is a GDB breakpoint. */ |
| 294 | |
| 295 | static int |
| 296 | is_gdb_breakpoint (enum bkpt_type type) |
| 297 | { |
| 298 | return (type == gdb_breakpoint_Z0 |
| 299 | || type == gdb_breakpoint_Z1 |
| 300 | || type == gdb_breakpoint_Z2 |
| 301 | || type == gdb_breakpoint_Z3 |
| 302 | || type == gdb_breakpoint_Z4); |
| 303 | } |
| 304 | |
| 305 | bool |
| 306 | any_persistent_commands (process_info *proc) |
| 307 | { |
| 308 | struct breakpoint *bp; |
| 309 | struct point_command_list *cl; |
| 310 | |
| 311 | for (bp = proc->breakpoints; bp != NULL; bp = bp->next) |
| 312 | { |
| 313 | if (is_gdb_breakpoint (bp->type)) |
| 314 | { |
| 315 | struct gdb_breakpoint *gdb_bp = (struct gdb_breakpoint *) bp; |
| 316 | |
| 317 | for (cl = gdb_bp->command_list; cl != NULL; cl = cl->next) |
| 318 | if (cl->persistence) |
| 319 | return true; |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | return false; |
| 324 | } |
| 325 | |
| 326 | /* Find low-level breakpoint of type TYPE at address ADDR that is not |
| 327 | insert-disabled. Returns NULL if not found. */ |
| 328 | |
| 329 | static struct raw_breakpoint * |
| 330 | find_enabled_raw_code_breakpoint_at (CORE_ADDR addr, enum raw_bkpt_type type) |
| 331 | { |
| 332 | struct process_info *proc = current_process (); |
| 333 | struct raw_breakpoint *bp; |
| 334 | |
| 335 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) |
| 336 | if (bp->pc == addr |
| 337 | && bp->raw_type == type |
| 338 | && bp->inserted >= 0) |
| 339 | return bp; |
| 340 | |
| 341 | return NULL; |
| 342 | } |
| 343 | |
| 344 | /* Find low-level breakpoint of type TYPE at address ADDR. Returns |
| 345 | NULL if not found. */ |
| 346 | |
| 347 | static struct raw_breakpoint * |
| 348 | find_raw_breakpoint_at (CORE_ADDR addr, enum raw_bkpt_type type, int kind) |
| 349 | { |
| 350 | struct process_info *proc = current_process (); |
| 351 | struct raw_breakpoint *bp; |
| 352 | |
| 353 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) |
| 354 | if (bp->pc == addr && bp->raw_type == type && bp->kind == kind) |
| 355 | return bp; |
| 356 | |
| 357 | return NULL; |
| 358 | } |
| 359 | |
| 360 | /* See mem-break.h. */ |
| 361 | |
| 362 | int |
| 363 | insert_memory_breakpoint (struct raw_breakpoint *bp) |
| 364 | { |
| 365 | unsigned char buf[MAX_BREAKPOINT_LEN]; |
| 366 | int err; |
| 367 | |
| 368 | /* Note that there can be fast tracepoint jumps installed in the |
| 369 | same memory range, so to get at the original memory, we need to |
| 370 | use read_inferior_memory, which masks those out. */ |
| 371 | err = read_inferior_memory (bp->pc, buf, bp_size (bp)); |
| 372 | if (err != 0) |
| 373 | { |
| 374 | if (debug_threads) |
| 375 | debug_printf ("Failed to read shadow memory of" |
| 376 | " breakpoint at 0x%s (%s).\n", |
| 377 | paddress (bp->pc), safe_strerror (err)); |
| 378 | } |
| 379 | else |
| 380 | { |
| 381 | memcpy (bp->old_data, buf, bp_size (bp)); |
| 382 | |
| 383 | err = the_target->write_memory (bp->pc, bp_opcode (bp), |
| 384 | bp_size (bp)); |
| 385 | if (err != 0) |
| 386 | { |
| 387 | if (debug_threads) |
| 388 | debug_printf ("Failed to insert breakpoint at 0x%s (%s).\n", |
| 389 | paddress (bp->pc), safe_strerror (err)); |
| 390 | } |
| 391 | } |
| 392 | return err != 0 ? -1 : 0; |
| 393 | } |
| 394 | |
| 395 | /* See mem-break.h */ |
| 396 | |
| 397 | int |
| 398 | remove_memory_breakpoint (struct raw_breakpoint *bp) |
| 399 | { |
| 400 | unsigned char buf[MAX_BREAKPOINT_LEN]; |
| 401 | int err; |
| 402 | |
| 403 | /* Since there can be trap breakpoints inserted in the same address |
| 404 | range, we use `target_write_memory', which takes care of |
| 405 | layering breakpoints on top of fast tracepoints, and on top of |
| 406 | the buffer we pass it. This works because the caller has already |
| 407 | either unlinked the breakpoint or marked it uninserted. Also |
| 408 | note that we need to pass the current shadow contents, because |
| 409 | target_write_memory updates any shadow memory with what we pass |
| 410 | here, and we want that to be a nop. */ |
| 411 | memcpy (buf, bp->old_data, bp_size (bp)); |
| 412 | err = target_write_memory (bp->pc, buf, bp_size (bp)); |
| 413 | if (err != 0) |
| 414 | { |
| 415 | if (debug_threads) |
| 416 | debug_printf ("Failed to uninsert raw breakpoint " |
| 417 | "at 0x%s (%s) while deleting it.\n", |
| 418 | paddress (bp->pc), safe_strerror (err)); |
| 419 | } |
| 420 | return err != 0 ? -1 : 0; |
| 421 | } |
| 422 | |
| 423 | /* Set a RAW breakpoint of type TYPE and kind KIND at WHERE. On |
| 424 | success, a pointer to the new breakpoint is returned. On failure, |
| 425 | returns NULL and writes the error code to *ERR. */ |
| 426 | |
| 427 | static struct raw_breakpoint * |
| 428 | set_raw_breakpoint_at (enum raw_bkpt_type type, CORE_ADDR where, int kind, |
| 429 | int *err) |
| 430 | { |
| 431 | struct process_info *proc = current_process (); |
| 432 | struct raw_breakpoint *bp; |
| 433 | |
| 434 | if (type == raw_bkpt_type_sw || type == raw_bkpt_type_hw) |
| 435 | { |
| 436 | bp = find_enabled_raw_code_breakpoint_at (where, type); |
| 437 | if (bp != NULL && bp->kind != kind) |
| 438 | { |
| 439 | /* A different kind than previously seen. The previous |
| 440 | breakpoint must be gone then. */ |
| 441 | if (debug_threads) |
| 442 | debug_printf ("Inconsistent breakpoint kind? Was %d, now %d.\n", |
| 443 | bp->kind, kind); |
| 444 | bp->inserted = -1; |
| 445 | bp = NULL; |
| 446 | } |
| 447 | } |
| 448 | else |
| 449 | bp = find_raw_breakpoint_at (where, type, kind); |
| 450 | |
| 451 | gdb::unique_xmalloc_ptr<struct raw_breakpoint> bp_holder; |
| 452 | if (bp == NULL) |
| 453 | { |
| 454 | bp_holder.reset (XCNEW (struct raw_breakpoint)); |
| 455 | bp = bp_holder.get (); |
| 456 | bp->pc = where; |
| 457 | bp->kind = kind; |
| 458 | bp->raw_type = type; |
| 459 | } |
| 460 | |
| 461 | if (!bp->inserted) |
| 462 | { |
| 463 | *err = the_target->insert_point (bp->raw_type, bp->pc, bp->kind, bp); |
| 464 | if (*err != 0) |
| 465 | { |
| 466 | if (debug_threads) |
| 467 | debug_printf ("Failed to insert breakpoint at 0x%s (%d).\n", |
| 468 | paddress (where), *err); |
| 469 | |
| 470 | return NULL; |
| 471 | } |
| 472 | |
| 473 | bp->inserted = 1; |
| 474 | } |
| 475 | |
| 476 | /* If the breakpoint was allocated above, we know we want to keep it |
| 477 | now. */ |
| 478 | bp_holder.release (); |
| 479 | |
| 480 | /* Link the breakpoint in, if this is the first reference. */ |
| 481 | if (++bp->refcount == 1) |
| 482 | { |
| 483 | bp->next = proc->raw_breakpoints; |
| 484 | proc->raw_breakpoints = bp; |
| 485 | } |
| 486 | return bp; |
| 487 | } |
| 488 | |
| 489 | /* Notice that breakpoint traps are always installed on top of fast |
| 490 | tracepoint jumps. This is even if the fast tracepoint is installed |
| 491 | at a later time compared to when the breakpoint was installed. |
| 492 | This means that a stopping breakpoint or tracepoint has higher |
| 493 | "priority". In turn, this allows having fast and slow tracepoints |
| 494 | (and breakpoints) at the same address behave correctly. */ |
| 495 | |
| 496 | |
| 497 | /* A fast tracepoint jump. */ |
| 498 | |
| 499 | struct fast_tracepoint_jump |
| 500 | { |
| 501 | struct fast_tracepoint_jump *next; |
| 502 | |
| 503 | /* A reference count. GDB can install more than one fast tracepoint |
| 504 | at the same address (each with its own action list, for |
| 505 | example). */ |
| 506 | int refcount; |
| 507 | |
| 508 | /* The fast tracepoint's insertion address. There can only be one |
| 509 | of these for a given PC. */ |
| 510 | CORE_ADDR pc; |
| 511 | |
| 512 | /* Non-zero if this fast tracepoint jump is currently inserted in |
| 513 | the inferior. */ |
| 514 | int inserted; |
| 515 | |
| 516 | /* The length of the jump instruction. */ |
| 517 | int length; |
| 518 | |
| 519 | /* A poor-man's flexible array member, holding both the jump |
| 520 | instruction to insert, and a copy of the instruction that would |
| 521 | be in memory had not been a jump there (the shadow memory of the |
| 522 | tracepoint jump). */ |
| 523 | unsigned char insn_and_shadow[0]; |
| 524 | }; |
| 525 | |
| 526 | /* Fast tracepoint FP's jump instruction to insert. */ |
| 527 | #define fast_tracepoint_jump_insn(fp) \ |
| 528 | ((fp)->insn_and_shadow + 0) |
| 529 | |
| 530 | /* The shadow memory of fast tracepoint jump FP. */ |
| 531 | #define fast_tracepoint_jump_shadow(fp) \ |
| 532 | ((fp)->insn_and_shadow + (fp)->length) |
| 533 | |
| 534 | |
| 535 | /* Return the fast tracepoint jump set at WHERE. */ |
| 536 | |
| 537 | static struct fast_tracepoint_jump * |
| 538 | find_fast_tracepoint_jump_at (CORE_ADDR where) |
| 539 | { |
| 540 | struct process_info *proc = current_process (); |
| 541 | struct fast_tracepoint_jump *jp; |
| 542 | |
| 543 | for (jp = proc->fast_tracepoint_jumps; jp != NULL; jp = jp->next) |
| 544 | if (jp->pc == where) |
| 545 | return jp; |
| 546 | |
| 547 | return NULL; |
| 548 | } |
| 549 | |
| 550 | int |
| 551 | fast_tracepoint_jump_here (CORE_ADDR where) |
| 552 | { |
| 553 | struct fast_tracepoint_jump *jp = find_fast_tracepoint_jump_at (where); |
| 554 | |
| 555 | return (jp != NULL); |
| 556 | } |
| 557 | |
| 558 | int |
| 559 | delete_fast_tracepoint_jump (struct fast_tracepoint_jump *todel) |
| 560 | { |
| 561 | struct fast_tracepoint_jump *bp, **bp_link; |
| 562 | int ret; |
| 563 | struct process_info *proc = current_process (); |
| 564 | |
| 565 | bp = proc->fast_tracepoint_jumps; |
| 566 | bp_link = &proc->fast_tracepoint_jumps; |
| 567 | |
| 568 | while (bp) |
| 569 | { |
| 570 | if (bp == todel) |
| 571 | { |
| 572 | if (--bp->refcount == 0) |
| 573 | { |
| 574 | struct fast_tracepoint_jump *prev_bp_link = *bp_link; |
| 575 | unsigned char *buf; |
| 576 | |
| 577 | /* Unlink it. */ |
| 578 | *bp_link = bp->next; |
| 579 | |
| 580 | /* Since there can be breakpoints inserted in the same |
| 581 | address range, we use `target_write_memory', which |
| 582 | takes care of layering breakpoints on top of fast |
| 583 | tracepoints, and on top of the buffer we pass it. |
| 584 | This works because we've already unlinked the fast |
| 585 | tracepoint jump above. Also note that we need to |
| 586 | pass the current shadow contents, because |
| 587 | target_write_memory updates any shadow memory with |
| 588 | what we pass here, and we want that to be a nop. */ |
| 589 | buf = (unsigned char *) alloca (bp->length); |
| 590 | memcpy (buf, fast_tracepoint_jump_shadow (bp), bp->length); |
| 591 | ret = target_write_memory (bp->pc, buf, bp->length); |
| 592 | if (ret != 0) |
| 593 | { |
| 594 | /* Something went wrong, relink the jump. */ |
| 595 | *bp_link = prev_bp_link; |
| 596 | |
| 597 | if (debug_threads) |
| 598 | debug_printf ("Failed to uninsert fast tracepoint jump " |
| 599 | "at 0x%s (%s) while deleting it.\n", |
| 600 | paddress (bp->pc), safe_strerror (ret)); |
| 601 | return ret; |
| 602 | } |
| 603 | |
| 604 | free (bp); |
| 605 | } |
| 606 | |
| 607 | return 0; |
| 608 | } |
| 609 | else |
| 610 | { |
| 611 | bp_link = &bp->next; |
| 612 | bp = *bp_link; |
| 613 | } |
| 614 | } |
| 615 | |
| 616 | warning ("Could not find fast tracepoint jump in list."); |
| 617 | return ENOENT; |
| 618 | } |
| 619 | |
| 620 | void |
| 621 | inc_ref_fast_tracepoint_jump (struct fast_tracepoint_jump *jp) |
| 622 | { |
| 623 | jp->refcount++; |
| 624 | } |
| 625 | |
| 626 | struct fast_tracepoint_jump * |
| 627 | set_fast_tracepoint_jump (CORE_ADDR where, |
| 628 | unsigned char *insn, ULONGEST length) |
| 629 | { |
| 630 | struct process_info *proc = current_process (); |
| 631 | struct fast_tracepoint_jump *jp; |
| 632 | int err; |
| 633 | unsigned char *buf; |
| 634 | |
| 635 | /* We refcount fast tracepoint jumps. Check if we already know |
| 636 | about a jump at this address. */ |
| 637 | jp = find_fast_tracepoint_jump_at (where); |
| 638 | if (jp != NULL) |
| 639 | { |
| 640 | jp->refcount++; |
| 641 | return jp; |
| 642 | } |
| 643 | |
| 644 | /* We don't, so create a new object. Double the length, because the |
| 645 | flexible array member holds both the jump insn, and the |
| 646 | shadow. */ |
| 647 | jp = (struct fast_tracepoint_jump *) xcalloc (1, sizeof (*jp) + (length * 2)); |
| 648 | jp->pc = where; |
| 649 | jp->length = length; |
| 650 | memcpy (fast_tracepoint_jump_insn (jp), insn, length); |
| 651 | jp->refcount = 1; |
| 652 | buf = (unsigned char *) alloca (length); |
| 653 | |
| 654 | /* Note that there can be trap breakpoints inserted in the same |
| 655 | address range. To access the original memory contents, we use |
| 656 | `read_inferior_memory', which masks out breakpoints. */ |
| 657 | err = read_inferior_memory (where, buf, length); |
| 658 | if (err != 0) |
| 659 | { |
| 660 | if (debug_threads) |
| 661 | debug_printf ("Failed to read shadow memory of" |
| 662 | " fast tracepoint at 0x%s (%s).\n", |
| 663 | paddress (where), safe_strerror (err)); |
| 664 | free (jp); |
| 665 | return NULL; |
| 666 | } |
| 667 | memcpy (fast_tracepoint_jump_shadow (jp), buf, length); |
| 668 | |
| 669 | /* Link the jump in. */ |
| 670 | jp->inserted = 1; |
| 671 | jp->next = proc->fast_tracepoint_jumps; |
| 672 | proc->fast_tracepoint_jumps = jp; |
| 673 | |
| 674 | /* Since there can be trap breakpoints inserted in the same address |
| 675 | range, we use use `target_write_memory', which takes care of |
| 676 | layering breakpoints on top of fast tracepoints, on top of the |
| 677 | buffer we pass it. This works because we've already linked in |
| 678 | the fast tracepoint jump above. Also note that we need to pass |
| 679 | the current shadow contents, because target_write_memory |
| 680 | updates any shadow memory with what we pass here, and we want |
| 681 | that to be a nop. */ |
| 682 | err = target_write_memory (where, buf, length); |
| 683 | if (err != 0) |
| 684 | { |
| 685 | if (debug_threads) |
| 686 | debug_printf ("Failed to insert fast tracepoint jump at 0x%s (%s).\n", |
| 687 | paddress (where), safe_strerror (err)); |
| 688 | |
| 689 | /* Unlink it. */ |
| 690 | proc->fast_tracepoint_jumps = jp->next; |
| 691 | free (jp); |
| 692 | |
| 693 | return NULL; |
| 694 | } |
| 695 | |
| 696 | return jp; |
| 697 | } |
| 698 | |
| 699 | void |
| 700 | uninsert_fast_tracepoint_jumps_at (CORE_ADDR pc) |
| 701 | { |
| 702 | struct fast_tracepoint_jump *jp; |
| 703 | int err; |
| 704 | |
| 705 | jp = find_fast_tracepoint_jump_at (pc); |
| 706 | if (jp == NULL) |
| 707 | { |
| 708 | /* This can happen when we remove all breakpoints while handling |
| 709 | a step-over. */ |
| 710 | if (debug_threads) |
| 711 | debug_printf ("Could not find fast tracepoint jump at 0x%s " |
| 712 | "in list (uninserting).\n", |
| 713 | paddress (pc)); |
| 714 | return; |
| 715 | } |
| 716 | |
| 717 | if (jp->inserted) |
| 718 | { |
| 719 | unsigned char *buf; |
| 720 | |
| 721 | jp->inserted = 0; |
| 722 | |
| 723 | /* Since there can be trap breakpoints inserted in the same |
| 724 | address range, we use use `target_write_memory', which |
| 725 | takes care of layering breakpoints on top of fast |
| 726 | tracepoints, and on top of the buffer we pass it. This works |
| 727 | because we've already marked the fast tracepoint fast |
| 728 | tracepoint jump uninserted above. Also note that we need to |
| 729 | pass the current shadow contents, because |
| 730 | target_write_memory updates any shadow memory with what we |
| 731 | pass here, and we want that to be a nop. */ |
| 732 | buf = (unsigned char *) alloca (jp->length); |
| 733 | memcpy (buf, fast_tracepoint_jump_shadow (jp), jp->length); |
| 734 | err = target_write_memory (jp->pc, buf, jp->length); |
| 735 | if (err != 0) |
| 736 | { |
| 737 | jp->inserted = 1; |
| 738 | |
| 739 | if (debug_threads) |
| 740 | debug_printf ("Failed to uninsert fast tracepoint jump at" |
| 741 | " 0x%s (%s).\n", |
| 742 | paddress (pc), safe_strerror (err)); |
| 743 | } |
| 744 | } |
| 745 | } |
| 746 | |
| 747 | void |
| 748 | reinsert_fast_tracepoint_jumps_at (CORE_ADDR where) |
| 749 | { |
| 750 | struct fast_tracepoint_jump *jp; |
| 751 | int err; |
| 752 | unsigned char *buf; |
| 753 | |
| 754 | jp = find_fast_tracepoint_jump_at (where); |
| 755 | if (jp == NULL) |
| 756 | { |
| 757 | /* This can happen when we remove breakpoints when a tracepoint |
| 758 | hit causes a tracing stop, while handling a step-over. */ |
| 759 | if (debug_threads) |
| 760 | debug_printf ("Could not find fast tracepoint jump at 0x%s " |
| 761 | "in list (reinserting).\n", |
| 762 | paddress (where)); |
| 763 | return; |
| 764 | } |
| 765 | |
| 766 | if (jp->inserted) |
| 767 | error ("Jump already inserted at reinsert time."); |
| 768 | |
| 769 | jp->inserted = 1; |
| 770 | |
| 771 | /* Since there can be trap breakpoints inserted in the same address |
| 772 | range, we use `target_write_memory', which takes care of |
| 773 | layering breakpoints on top of fast tracepoints, and on top of |
| 774 | the buffer we pass it. This works because we've already marked |
| 775 | the fast tracepoint jump inserted above. Also note that we need |
| 776 | to pass the current shadow contents, because |
| 777 | target_write_memory updates any shadow memory with what we pass |
| 778 | here, and we want that to be a nop. */ |
| 779 | buf = (unsigned char *) alloca (jp->length); |
| 780 | memcpy (buf, fast_tracepoint_jump_shadow (jp), jp->length); |
| 781 | err = target_write_memory (where, buf, jp->length); |
| 782 | if (err != 0) |
| 783 | { |
| 784 | jp->inserted = 0; |
| 785 | |
| 786 | if (debug_threads) |
| 787 | debug_printf ("Failed to reinsert fast tracepoint jump at" |
| 788 | " 0x%s (%s).\n", |
| 789 | paddress (where), safe_strerror (err)); |
| 790 | } |
| 791 | } |
| 792 | |
| 793 | /* Set a high-level breakpoint of type TYPE, with low level type |
| 794 | RAW_TYPE and kind KIND, at WHERE. On success, a pointer to the new |
| 795 | breakpoint is returned. On failure, returns NULL and writes the |
| 796 | error code to *ERR. HANDLER is called when the breakpoint is hit. |
| 797 | HANDLER should return 1 if the breakpoint should be deleted, 0 |
| 798 | otherwise. */ |
| 799 | |
| 800 | static struct breakpoint * |
| 801 | set_breakpoint (enum bkpt_type type, enum raw_bkpt_type raw_type, |
| 802 | CORE_ADDR where, int kind, |
| 803 | int (*handler) (CORE_ADDR), int *err) |
| 804 | { |
| 805 | struct process_info *proc = current_process (); |
| 806 | struct breakpoint *bp; |
| 807 | struct raw_breakpoint *raw; |
| 808 | |
| 809 | raw = set_raw_breakpoint_at (raw_type, where, kind, err); |
| 810 | |
| 811 | if (raw == NULL) |
| 812 | { |
| 813 | /* warn? */ |
| 814 | return NULL; |
| 815 | } |
| 816 | |
| 817 | if (is_gdb_breakpoint (type)) |
| 818 | { |
| 819 | struct gdb_breakpoint *gdb_bp = XCNEW (struct gdb_breakpoint); |
| 820 | |
| 821 | bp = (struct breakpoint *) gdb_bp; |
| 822 | gdb_assert (handler == NULL); |
| 823 | } |
| 824 | else if (type == other_breakpoint) |
| 825 | { |
| 826 | struct other_breakpoint *other_bp = XCNEW (struct other_breakpoint); |
| 827 | |
| 828 | other_bp->handler = handler; |
| 829 | bp = (struct breakpoint *) other_bp; |
| 830 | } |
| 831 | else if (type == single_step_breakpoint) |
| 832 | { |
| 833 | struct single_step_breakpoint *ss_bp |
| 834 | = XCNEW (struct single_step_breakpoint); |
| 835 | |
| 836 | bp = (struct breakpoint *) ss_bp; |
| 837 | } |
| 838 | else |
| 839 | gdb_assert_not_reached ("unhandled breakpoint type"); |
| 840 | |
| 841 | bp->type = type; |
| 842 | bp->raw = raw; |
| 843 | |
| 844 | bp->next = proc->breakpoints; |
| 845 | proc->breakpoints = bp; |
| 846 | |
| 847 | return bp; |
| 848 | } |
| 849 | |
| 850 | /* Set breakpoint of TYPE on address WHERE with handler HANDLER. */ |
| 851 | |
| 852 | static struct breakpoint * |
| 853 | set_breakpoint_type_at (enum bkpt_type type, CORE_ADDR where, |
| 854 | int (*handler) (CORE_ADDR)) |
| 855 | { |
| 856 | int err_ignored; |
| 857 | CORE_ADDR placed_address = where; |
| 858 | int breakpoint_kind = target_breakpoint_kind_from_pc (&placed_address); |
| 859 | |
| 860 | return set_breakpoint (type, raw_bkpt_type_sw, |
| 861 | placed_address, breakpoint_kind, handler, |
| 862 | &err_ignored); |
| 863 | } |
| 864 | |
| 865 | /* See mem-break.h */ |
| 866 | |
| 867 | struct breakpoint * |
| 868 | set_breakpoint_at (CORE_ADDR where, int (*handler) (CORE_ADDR)) |
| 869 | { |
| 870 | return set_breakpoint_type_at (other_breakpoint, where, handler); |
| 871 | } |
| 872 | |
| 873 | |
| 874 | static int |
| 875 | delete_raw_breakpoint (struct process_info *proc, struct raw_breakpoint *todel) |
| 876 | { |
| 877 | struct raw_breakpoint *bp, **bp_link; |
| 878 | int ret; |
| 879 | |
| 880 | bp = proc->raw_breakpoints; |
| 881 | bp_link = &proc->raw_breakpoints; |
| 882 | |
| 883 | while (bp) |
| 884 | { |
| 885 | if (bp == todel) |
| 886 | { |
| 887 | if (bp->inserted > 0) |
| 888 | { |
| 889 | struct raw_breakpoint *prev_bp_link = *bp_link; |
| 890 | |
| 891 | *bp_link = bp->next; |
| 892 | |
| 893 | ret = the_target->remove_point (bp->raw_type, bp->pc, |
| 894 | bp->kind, bp); |
| 895 | if (ret != 0) |
| 896 | { |
| 897 | /* Something went wrong, relink the breakpoint. */ |
| 898 | *bp_link = prev_bp_link; |
| 899 | |
| 900 | if (debug_threads) |
| 901 | debug_printf ("Failed to uninsert raw breakpoint " |
| 902 | "at 0x%s while deleting it.\n", |
| 903 | paddress (bp->pc)); |
| 904 | return ret; |
| 905 | } |
| 906 | } |
| 907 | else |
| 908 | *bp_link = bp->next; |
| 909 | |
| 910 | free (bp); |
| 911 | return 0; |
| 912 | } |
| 913 | else |
| 914 | { |
| 915 | bp_link = &bp->next; |
| 916 | bp = *bp_link; |
| 917 | } |
| 918 | } |
| 919 | |
| 920 | warning ("Could not find raw breakpoint in list."); |
| 921 | return ENOENT; |
| 922 | } |
| 923 | |
| 924 | static int |
| 925 | release_breakpoint (struct process_info *proc, struct breakpoint *bp) |
| 926 | { |
| 927 | int newrefcount; |
| 928 | int ret; |
| 929 | |
| 930 | newrefcount = bp->raw->refcount - 1; |
| 931 | if (newrefcount == 0) |
| 932 | { |
| 933 | ret = delete_raw_breakpoint (proc, bp->raw); |
| 934 | if (ret != 0) |
| 935 | return ret; |
| 936 | } |
| 937 | else |
| 938 | bp->raw->refcount = newrefcount; |
| 939 | |
| 940 | free (bp); |
| 941 | |
| 942 | return 0; |
| 943 | } |
| 944 | |
| 945 | static int |
| 946 | delete_breakpoint_1 (struct process_info *proc, struct breakpoint *todel) |
| 947 | { |
| 948 | struct breakpoint *bp, **bp_link; |
| 949 | int err; |
| 950 | |
| 951 | bp = proc->breakpoints; |
| 952 | bp_link = &proc->breakpoints; |
| 953 | |
| 954 | while (bp) |
| 955 | { |
| 956 | if (bp == todel) |
| 957 | { |
| 958 | *bp_link = bp->next; |
| 959 | |
| 960 | err = release_breakpoint (proc, bp); |
| 961 | if (err != 0) |
| 962 | return err; |
| 963 | |
| 964 | bp = *bp_link; |
| 965 | return 0; |
| 966 | } |
| 967 | else |
| 968 | { |
| 969 | bp_link = &bp->next; |
| 970 | bp = *bp_link; |
| 971 | } |
| 972 | } |
| 973 | |
| 974 | warning ("Could not find breakpoint in list."); |
| 975 | return ENOENT; |
| 976 | } |
| 977 | |
| 978 | int |
| 979 | delete_breakpoint (struct breakpoint *todel) |
| 980 | { |
| 981 | struct process_info *proc = current_process (); |
| 982 | return delete_breakpoint_1 (proc, todel); |
| 983 | } |
| 984 | |
| 985 | /* Locate a GDB breakpoint of type Z_TYPE and kind KIND placed at |
| 986 | address ADDR and return a pointer to its structure. If KIND is -1, |
| 987 | the breakpoint's kind is ignored. */ |
| 988 | |
| 989 | static struct gdb_breakpoint * |
| 990 | find_gdb_breakpoint (char z_type, CORE_ADDR addr, int kind) |
| 991 | { |
| 992 | struct process_info *proc = current_process (); |
| 993 | struct breakpoint *bp; |
| 994 | enum bkpt_type type = Z_packet_to_bkpt_type (z_type); |
| 995 | |
| 996 | for (bp = proc->breakpoints; bp != NULL; bp = bp->next) |
| 997 | if (bp->type == type && bp->raw->pc == addr |
| 998 | && (kind == -1 || bp->raw->kind == kind)) |
| 999 | return (struct gdb_breakpoint *) bp; |
| 1000 | |
| 1001 | return NULL; |
| 1002 | } |
| 1003 | |
| 1004 | static int |
| 1005 | z_type_supported (char z_type) |
| 1006 | { |
| 1007 | return (z_type >= '0' && z_type <= '4' |
| 1008 | && the_target->supports_z_point_type (z_type)); |
| 1009 | } |
| 1010 | |
| 1011 | /* Create a new GDB breakpoint of type Z_TYPE at ADDR with kind KIND. |
| 1012 | Returns a pointer to the newly created breakpoint on success. On |
| 1013 | failure returns NULL and sets *ERR to either -1 for error, or 1 if |
| 1014 | Z_TYPE breakpoints are not supported on this target. */ |
| 1015 | |
| 1016 | static struct gdb_breakpoint * |
| 1017 | set_gdb_breakpoint_1 (char z_type, CORE_ADDR addr, int kind, int *err) |
| 1018 | { |
| 1019 | struct gdb_breakpoint *bp; |
| 1020 | enum bkpt_type type; |
| 1021 | enum raw_bkpt_type raw_type; |
| 1022 | |
| 1023 | /* If we see GDB inserting a second code breakpoint at the same |
| 1024 | address, then either: GDB is updating the breakpoint's conditions |
| 1025 | or commands; or, the first breakpoint must have disappeared due |
| 1026 | to a shared library unload. On targets where the shared |
| 1027 | libraries are handled by userspace, like SVR4, for example, |
| 1028 | GDBserver can't tell if a library was loaded or unloaded. Since |
| 1029 | we refcount raw breakpoints, we must be careful to make sure GDB |
| 1030 | breakpoints never contribute more than one reference. if we |
| 1031 | didn't do this, in case the previous breakpoint is gone due to a |
| 1032 | shared library unload, we'd just increase the refcount of the |
| 1033 | previous breakpoint at this address, but the trap was not planted |
| 1034 | in the inferior anymore, thus the breakpoint would never be hit. |
| 1035 | Note this must be careful to not create a window where |
| 1036 | breakpoints are removed from the target, for non-stop, in case |
| 1037 | the target can poke at memory while the program is running. */ |
| 1038 | if (z_type == Z_PACKET_SW_BP |
| 1039 | || z_type == Z_PACKET_HW_BP) |
| 1040 | { |
| 1041 | bp = find_gdb_breakpoint (z_type, addr, -1); |
| 1042 | |
| 1043 | if (bp != NULL) |
| 1044 | { |
| 1045 | if (bp->base.raw->kind != kind) |
| 1046 | { |
| 1047 | /* A different kind than previously seen. The previous |
| 1048 | breakpoint must be gone then. */ |
| 1049 | bp->base.raw->inserted = -1; |
| 1050 | delete_breakpoint ((struct breakpoint *) bp); |
| 1051 | bp = NULL; |
| 1052 | } |
| 1053 | else if (z_type == Z_PACKET_SW_BP) |
| 1054 | { |
| 1055 | /* Check if the breakpoint is actually gone from the |
| 1056 | target, due to an solib unload, for example. Might |
| 1057 | as well validate _all_ breakpoints. */ |
| 1058 | validate_breakpoints (); |
| 1059 | |
| 1060 | /* Breakpoints that don't pass validation are |
| 1061 | deleted. */ |
| 1062 | bp = find_gdb_breakpoint (z_type, addr, -1); |
| 1063 | } |
| 1064 | } |
| 1065 | } |
| 1066 | else |
| 1067 | { |
| 1068 | /* Data breakpoints for the same address but different kind are |
| 1069 | expected. GDB doesn't merge these. The backend gets to do |
| 1070 | that if it wants/can. */ |
| 1071 | bp = find_gdb_breakpoint (z_type, addr, kind); |
| 1072 | } |
| 1073 | |
| 1074 | if (bp != NULL) |
| 1075 | { |
| 1076 | /* We already know about this breakpoint, there's nothing else |
| 1077 | to do - GDB's reference is already accounted for. Note that |
| 1078 | whether the breakpoint inserted is left as is - we may be |
| 1079 | stepping over it, for example, in which case we don't want to |
| 1080 | force-reinsert it. */ |
| 1081 | return bp; |
| 1082 | } |
| 1083 | |
| 1084 | raw_type = Z_packet_to_raw_bkpt_type (z_type); |
| 1085 | type = Z_packet_to_bkpt_type (z_type); |
| 1086 | return (struct gdb_breakpoint *) set_breakpoint (type, raw_type, addr, |
| 1087 | kind, NULL, err); |
| 1088 | } |
| 1089 | |
| 1090 | static int |
| 1091 | check_gdb_bp_preconditions (char z_type, int *err) |
| 1092 | { |
| 1093 | /* As software/memory breakpoints work by poking at memory, we need |
| 1094 | to prepare to access memory. If that operation fails, we need to |
| 1095 | return error. Seeing an error, if this is the first breakpoint |
| 1096 | of that type that GDB tries to insert, GDB would then assume the |
| 1097 | breakpoint type is supported, but it may actually not be. So we |
| 1098 | need to check whether the type is supported at all before |
| 1099 | preparing to access memory. */ |
| 1100 | if (!z_type_supported (z_type)) |
| 1101 | { |
| 1102 | *err = 1; |
| 1103 | return 0; |
| 1104 | } |
| 1105 | |
| 1106 | return 1; |
| 1107 | } |
| 1108 | |
| 1109 | /* See mem-break.h. This is a wrapper for set_gdb_breakpoint_1 that |
| 1110 | knows to prepare to access memory for Z0 breakpoints. */ |
| 1111 | |
| 1112 | struct gdb_breakpoint * |
| 1113 | set_gdb_breakpoint (char z_type, CORE_ADDR addr, int kind, int *err) |
| 1114 | { |
| 1115 | struct gdb_breakpoint *bp; |
| 1116 | |
| 1117 | if (!check_gdb_bp_preconditions (z_type, err)) |
| 1118 | return NULL; |
| 1119 | |
| 1120 | /* If inserting a software/memory breakpoint, need to prepare to |
| 1121 | access memory. */ |
| 1122 | if (z_type == Z_PACKET_SW_BP) |
| 1123 | { |
| 1124 | if (prepare_to_access_memory () != 0) |
| 1125 | { |
| 1126 | *err = -1; |
| 1127 | return NULL; |
| 1128 | } |
| 1129 | } |
| 1130 | |
| 1131 | bp = set_gdb_breakpoint_1 (z_type, addr, kind, err); |
| 1132 | |
| 1133 | if (z_type == Z_PACKET_SW_BP) |
| 1134 | done_accessing_memory (); |
| 1135 | |
| 1136 | return bp; |
| 1137 | } |
| 1138 | |
| 1139 | /* Delete a GDB breakpoint of type Z_TYPE and kind KIND previously |
| 1140 | inserted at ADDR with set_gdb_breakpoint_at. Returns 0 on success, |
| 1141 | -1 on error, and 1 if Z_TYPE breakpoints are not supported on this |
| 1142 | target. */ |
| 1143 | |
| 1144 | static int |
| 1145 | delete_gdb_breakpoint_1 (char z_type, CORE_ADDR addr, int kind) |
| 1146 | { |
| 1147 | struct gdb_breakpoint *bp; |
| 1148 | int err; |
| 1149 | |
| 1150 | bp = find_gdb_breakpoint (z_type, addr, kind); |
| 1151 | if (bp == NULL) |
| 1152 | return -1; |
| 1153 | |
| 1154 | /* Before deleting the breakpoint, make sure to free its condition |
| 1155 | and command lists. */ |
| 1156 | clear_breakpoint_conditions_and_commands (bp); |
| 1157 | err = delete_breakpoint ((struct breakpoint *) bp); |
| 1158 | if (err != 0) |
| 1159 | return -1; |
| 1160 | |
| 1161 | return 0; |
| 1162 | } |
| 1163 | |
| 1164 | /* See mem-break.h. This is a wrapper for delete_gdb_breakpoint that |
| 1165 | knows to prepare to access memory for Z0 breakpoints. */ |
| 1166 | |
| 1167 | int |
| 1168 | delete_gdb_breakpoint (char z_type, CORE_ADDR addr, int kind) |
| 1169 | { |
| 1170 | int ret; |
| 1171 | |
| 1172 | if (!check_gdb_bp_preconditions (z_type, &ret)) |
| 1173 | return ret; |
| 1174 | |
| 1175 | /* If inserting a software/memory breakpoint, need to prepare to |
| 1176 | access memory. */ |
| 1177 | if (z_type == Z_PACKET_SW_BP) |
| 1178 | { |
| 1179 | int err; |
| 1180 | |
| 1181 | err = prepare_to_access_memory (); |
| 1182 | if (err != 0) |
| 1183 | return -1; |
| 1184 | } |
| 1185 | |
| 1186 | ret = delete_gdb_breakpoint_1 (z_type, addr, kind); |
| 1187 | |
| 1188 | if (z_type == Z_PACKET_SW_BP) |
| 1189 | done_accessing_memory (); |
| 1190 | |
| 1191 | return ret; |
| 1192 | } |
| 1193 | |
| 1194 | /* Clear all conditions associated with a breakpoint. */ |
| 1195 | |
| 1196 | static void |
| 1197 | clear_breakpoint_conditions (struct gdb_breakpoint *bp) |
| 1198 | { |
| 1199 | struct point_cond_list *cond; |
| 1200 | |
| 1201 | if (bp->cond_list == NULL) |
| 1202 | return; |
| 1203 | |
| 1204 | cond = bp->cond_list; |
| 1205 | |
| 1206 | while (cond != NULL) |
| 1207 | { |
| 1208 | struct point_cond_list *cond_next; |
| 1209 | |
| 1210 | cond_next = cond->next; |
| 1211 | gdb_free_agent_expr (cond->cond); |
| 1212 | free (cond); |
| 1213 | cond = cond_next; |
| 1214 | } |
| 1215 | |
| 1216 | bp->cond_list = NULL; |
| 1217 | } |
| 1218 | |
| 1219 | /* Clear all commands associated with a breakpoint. */ |
| 1220 | |
| 1221 | static void |
| 1222 | clear_breakpoint_commands (struct gdb_breakpoint *bp) |
| 1223 | { |
| 1224 | struct point_command_list *cmd; |
| 1225 | |
| 1226 | if (bp->command_list == NULL) |
| 1227 | return; |
| 1228 | |
| 1229 | cmd = bp->command_list; |
| 1230 | |
| 1231 | while (cmd != NULL) |
| 1232 | { |
| 1233 | struct point_command_list *cmd_next; |
| 1234 | |
| 1235 | cmd_next = cmd->next; |
| 1236 | gdb_free_agent_expr (cmd->cmd); |
| 1237 | free (cmd); |
| 1238 | cmd = cmd_next; |
| 1239 | } |
| 1240 | |
| 1241 | bp->command_list = NULL; |
| 1242 | } |
| 1243 | |
| 1244 | void |
| 1245 | clear_breakpoint_conditions_and_commands (struct gdb_breakpoint *bp) |
| 1246 | { |
| 1247 | clear_breakpoint_conditions (bp); |
| 1248 | clear_breakpoint_commands (bp); |
| 1249 | } |
| 1250 | |
| 1251 | /* Add condition CONDITION to GDBserver's breakpoint BP. */ |
| 1252 | |
| 1253 | static void |
| 1254 | add_condition_to_breakpoint (struct gdb_breakpoint *bp, |
| 1255 | struct agent_expr *condition) |
| 1256 | { |
| 1257 | struct point_cond_list *new_cond; |
| 1258 | |
| 1259 | /* Create new condition. */ |
| 1260 | new_cond = XCNEW (struct point_cond_list); |
| 1261 | new_cond->cond = condition; |
| 1262 | |
| 1263 | /* Add condition to the list. */ |
| 1264 | new_cond->next = bp->cond_list; |
| 1265 | bp->cond_list = new_cond; |
| 1266 | } |
| 1267 | |
| 1268 | /* Add a target-side condition CONDITION to a breakpoint. */ |
| 1269 | |
| 1270 | int |
| 1271 | add_breakpoint_condition (struct gdb_breakpoint *bp, const char **condition) |
| 1272 | { |
| 1273 | const char *actparm = *condition; |
| 1274 | struct agent_expr *cond; |
| 1275 | |
| 1276 | if (condition == NULL) |
| 1277 | return 1; |
| 1278 | |
| 1279 | if (bp == NULL) |
| 1280 | return 0; |
| 1281 | |
| 1282 | cond = gdb_parse_agent_expr (&actparm); |
| 1283 | |
| 1284 | if (cond == NULL) |
| 1285 | { |
| 1286 | warning ("Condition evaluation failed. Assuming unconditional."); |
| 1287 | return 0; |
| 1288 | } |
| 1289 | |
| 1290 | add_condition_to_breakpoint (bp, cond); |
| 1291 | |
| 1292 | *condition = actparm; |
| 1293 | |
| 1294 | return 1; |
| 1295 | } |
| 1296 | |
| 1297 | /* Evaluate condition (if any) at breakpoint BP. Return 1 if |
| 1298 | true and 0 otherwise. */ |
| 1299 | |
| 1300 | static int |
| 1301 | gdb_condition_true_at_breakpoint_z_type (char z_type, CORE_ADDR addr) |
| 1302 | { |
| 1303 | /* Fetch registers for the current inferior. */ |
| 1304 | struct gdb_breakpoint *bp = find_gdb_breakpoint (z_type, addr, -1); |
| 1305 | ULONGEST value = 0; |
| 1306 | struct point_cond_list *cl; |
| 1307 | int err = 0; |
| 1308 | struct eval_agent_expr_context ctx; |
| 1309 | |
| 1310 | if (bp == NULL) |
| 1311 | return 0; |
| 1312 | |
| 1313 | /* Check if the breakpoint is unconditional. If it is, |
| 1314 | the condition always evaluates to TRUE. */ |
| 1315 | if (bp->cond_list == NULL) |
| 1316 | return 1; |
| 1317 | |
| 1318 | ctx.regcache = get_thread_regcache (current_thread, 1); |
| 1319 | ctx.tframe = NULL; |
| 1320 | ctx.tpoint = NULL; |
| 1321 | |
| 1322 | /* Evaluate each condition in the breakpoint's list of conditions. |
| 1323 | Return true if any of the conditions evaluates to TRUE. |
| 1324 | |
| 1325 | If we failed to evaluate the expression, TRUE is returned. This |
| 1326 | forces GDB to reevaluate the conditions. */ |
| 1327 | for (cl = bp->cond_list; |
| 1328 | cl && !value && !err; cl = cl->next) |
| 1329 | { |
| 1330 | /* Evaluate the condition. */ |
| 1331 | err = gdb_eval_agent_expr (&ctx, cl->cond, &value); |
| 1332 | } |
| 1333 | |
| 1334 | if (err) |
| 1335 | return 1; |
| 1336 | |
| 1337 | return (value != 0); |
| 1338 | } |
| 1339 | |
| 1340 | int |
| 1341 | gdb_condition_true_at_breakpoint (CORE_ADDR where) |
| 1342 | { |
| 1343 | /* Only check code (software or hardware) breakpoints. */ |
| 1344 | return (gdb_condition_true_at_breakpoint_z_type (Z_PACKET_SW_BP, where) |
| 1345 | || gdb_condition_true_at_breakpoint_z_type (Z_PACKET_HW_BP, where)); |
| 1346 | } |
| 1347 | |
| 1348 | /* Add commands COMMANDS to GDBserver's breakpoint BP. */ |
| 1349 | |
| 1350 | static void |
| 1351 | add_commands_to_breakpoint (struct gdb_breakpoint *bp, |
| 1352 | struct agent_expr *commands, int persist) |
| 1353 | { |
| 1354 | struct point_command_list *new_cmd; |
| 1355 | |
| 1356 | /* Create new command. */ |
| 1357 | new_cmd = XCNEW (struct point_command_list); |
| 1358 | new_cmd->cmd = commands; |
| 1359 | new_cmd->persistence = persist; |
| 1360 | |
| 1361 | /* Add commands to the list. */ |
| 1362 | new_cmd->next = bp->command_list; |
| 1363 | bp->command_list = new_cmd; |
| 1364 | } |
| 1365 | |
| 1366 | /* Add a target-side command COMMAND to the breakpoint at ADDR. */ |
| 1367 | |
| 1368 | int |
| 1369 | add_breakpoint_commands (struct gdb_breakpoint *bp, const char **command, |
| 1370 | int persist) |
| 1371 | { |
| 1372 | const char *actparm = *command; |
| 1373 | struct agent_expr *cmd; |
| 1374 | |
| 1375 | if (command == NULL) |
| 1376 | return 1; |
| 1377 | |
| 1378 | if (bp == NULL) |
| 1379 | return 0; |
| 1380 | |
| 1381 | cmd = gdb_parse_agent_expr (&actparm); |
| 1382 | |
| 1383 | if (cmd == NULL) |
| 1384 | { |
| 1385 | warning ("Command evaluation failed. Disabling."); |
| 1386 | return 0; |
| 1387 | } |
| 1388 | |
| 1389 | add_commands_to_breakpoint (bp, cmd, persist); |
| 1390 | |
| 1391 | *command = actparm; |
| 1392 | |
| 1393 | return 1; |
| 1394 | } |
| 1395 | |
| 1396 | /* Return true if there are no commands to run at this location, |
| 1397 | which likely means we want to report back to GDB. */ |
| 1398 | |
| 1399 | static int |
| 1400 | gdb_no_commands_at_breakpoint_z_type (char z_type, CORE_ADDR addr) |
| 1401 | { |
| 1402 | struct gdb_breakpoint *bp = find_gdb_breakpoint (z_type, addr, -1); |
| 1403 | |
| 1404 | if (bp == NULL) |
| 1405 | return 1; |
| 1406 | |
| 1407 | if (debug_threads) |
| 1408 | debug_printf ("at 0x%s, type Z%c, bp command_list is 0x%s\n", |
| 1409 | paddress (addr), z_type, |
| 1410 | phex_nz ((uintptr_t) bp->command_list, 0)); |
| 1411 | return (bp->command_list == NULL); |
| 1412 | } |
| 1413 | |
| 1414 | /* Return true if there are no commands to run at this location, |
| 1415 | which likely means we want to report back to GDB. */ |
| 1416 | |
| 1417 | int |
| 1418 | gdb_no_commands_at_breakpoint (CORE_ADDR where) |
| 1419 | { |
| 1420 | /* Only check code (software or hardware) breakpoints. */ |
| 1421 | return (gdb_no_commands_at_breakpoint_z_type (Z_PACKET_SW_BP, where) |
| 1422 | && gdb_no_commands_at_breakpoint_z_type (Z_PACKET_HW_BP, where)); |
| 1423 | } |
| 1424 | |
| 1425 | /* Run a breakpoint's commands. Returns 0 if there was a problem |
| 1426 | running any command, 1 otherwise. */ |
| 1427 | |
| 1428 | static int |
| 1429 | run_breakpoint_commands_z_type (char z_type, CORE_ADDR addr) |
| 1430 | { |
| 1431 | /* Fetch registers for the current inferior. */ |
| 1432 | struct gdb_breakpoint *bp = find_gdb_breakpoint (z_type, addr, -1); |
| 1433 | ULONGEST value = 0; |
| 1434 | struct point_command_list *cl; |
| 1435 | int err = 0; |
| 1436 | struct eval_agent_expr_context ctx; |
| 1437 | |
| 1438 | if (bp == NULL) |
| 1439 | return 1; |
| 1440 | |
| 1441 | ctx.regcache = get_thread_regcache (current_thread, 1); |
| 1442 | ctx.tframe = NULL; |
| 1443 | ctx.tpoint = NULL; |
| 1444 | |
| 1445 | for (cl = bp->command_list; |
| 1446 | cl && !value && !err; cl = cl->next) |
| 1447 | { |
| 1448 | /* Run the command. */ |
| 1449 | err = gdb_eval_agent_expr (&ctx, cl->cmd, &value); |
| 1450 | |
| 1451 | /* If one command has a problem, stop digging the hole deeper. */ |
| 1452 | if (err) |
| 1453 | return 0; |
| 1454 | } |
| 1455 | |
| 1456 | return 1; |
| 1457 | } |
| 1458 | |
| 1459 | void |
| 1460 | run_breakpoint_commands (CORE_ADDR where) |
| 1461 | { |
| 1462 | /* Only check code (software or hardware) breakpoints. If one |
| 1463 | command has a problem, stop digging the hole deeper. */ |
| 1464 | if (run_breakpoint_commands_z_type (Z_PACKET_SW_BP, where)) |
| 1465 | run_breakpoint_commands_z_type (Z_PACKET_HW_BP, where); |
| 1466 | } |
| 1467 | |
| 1468 | /* See mem-break.h. */ |
| 1469 | |
| 1470 | int |
| 1471 | gdb_breakpoint_here (CORE_ADDR where) |
| 1472 | { |
| 1473 | /* Only check code (software or hardware) breakpoints. */ |
| 1474 | return (find_gdb_breakpoint (Z_PACKET_SW_BP, where, -1) != NULL |
| 1475 | || find_gdb_breakpoint (Z_PACKET_HW_BP, where, -1) != NULL); |
| 1476 | } |
| 1477 | |
| 1478 | void |
| 1479 | set_single_step_breakpoint (CORE_ADDR stop_at, ptid_t ptid) |
| 1480 | { |
| 1481 | struct single_step_breakpoint *bp; |
| 1482 | |
| 1483 | gdb_assert (current_ptid.pid () == ptid.pid ()); |
| 1484 | |
| 1485 | bp = (struct single_step_breakpoint *) set_breakpoint_type_at (single_step_breakpoint, |
| 1486 | stop_at, NULL); |
| 1487 | bp->ptid = ptid; |
| 1488 | } |
| 1489 | |
| 1490 | void |
| 1491 | delete_single_step_breakpoints (struct thread_info *thread) |
| 1492 | { |
| 1493 | struct process_info *proc = get_thread_process (thread); |
| 1494 | struct breakpoint *bp, **bp_link; |
| 1495 | |
| 1496 | bp = proc->breakpoints; |
| 1497 | bp_link = &proc->breakpoints; |
| 1498 | |
| 1499 | while (bp) |
| 1500 | { |
| 1501 | if (bp->type == single_step_breakpoint |
| 1502 | && ((struct single_step_breakpoint *) bp)->ptid == ptid_of (thread)) |
| 1503 | { |
| 1504 | struct thread_info *saved_thread = current_thread; |
| 1505 | |
| 1506 | current_thread = thread; |
| 1507 | *bp_link = bp->next; |
| 1508 | release_breakpoint (proc, bp); |
| 1509 | bp = *bp_link; |
| 1510 | current_thread = saved_thread; |
| 1511 | } |
| 1512 | else |
| 1513 | { |
| 1514 | bp_link = &bp->next; |
| 1515 | bp = *bp_link; |
| 1516 | } |
| 1517 | } |
| 1518 | } |
| 1519 | |
| 1520 | static void |
| 1521 | uninsert_raw_breakpoint (struct raw_breakpoint *bp) |
| 1522 | { |
| 1523 | if (bp->inserted < 0) |
| 1524 | { |
| 1525 | if (debug_threads) |
| 1526 | debug_printf ("Breakpoint at %s is marked insert-disabled.\n", |
| 1527 | paddress (bp->pc)); |
| 1528 | } |
| 1529 | else if (bp->inserted > 0) |
| 1530 | { |
| 1531 | int err; |
| 1532 | |
| 1533 | bp->inserted = 0; |
| 1534 | |
| 1535 | err = the_target->remove_point (bp->raw_type, bp->pc, bp->kind, bp); |
| 1536 | if (err != 0) |
| 1537 | { |
| 1538 | bp->inserted = 1; |
| 1539 | |
| 1540 | if (debug_threads) |
| 1541 | debug_printf ("Failed to uninsert raw breakpoint at 0x%s.\n", |
| 1542 | paddress (bp->pc)); |
| 1543 | } |
| 1544 | } |
| 1545 | } |
| 1546 | |
| 1547 | void |
| 1548 | uninsert_breakpoints_at (CORE_ADDR pc) |
| 1549 | { |
| 1550 | struct process_info *proc = current_process (); |
| 1551 | struct raw_breakpoint *bp; |
| 1552 | int found = 0; |
| 1553 | |
| 1554 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) |
| 1555 | if ((bp->raw_type == raw_bkpt_type_sw |
| 1556 | || bp->raw_type == raw_bkpt_type_hw) |
| 1557 | && bp->pc == pc) |
| 1558 | { |
| 1559 | found = 1; |
| 1560 | |
| 1561 | if (bp->inserted) |
| 1562 | uninsert_raw_breakpoint (bp); |
| 1563 | } |
| 1564 | |
| 1565 | if (!found) |
| 1566 | { |
| 1567 | /* This can happen when we remove all breakpoints while handling |
| 1568 | a step-over. */ |
| 1569 | if (debug_threads) |
| 1570 | debug_printf ("Could not find breakpoint at 0x%s " |
| 1571 | "in list (uninserting).\n", |
| 1572 | paddress (pc)); |
| 1573 | } |
| 1574 | } |
| 1575 | |
| 1576 | void |
| 1577 | uninsert_all_breakpoints (void) |
| 1578 | { |
| 1579 | struct process_info *proc = current_process (); |
| 1580 | struct raw_breakpoint *bp; |
| 1581 | |
| 1582 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) |
| 1583 | if ((bp->raw_type == raw_bkpt_type_sw |
| 1584 | || bp->raw_type == raw_bkpt_type_hw) |
| 1585 | && bp->inserted) |
| 1586 | uninsert_raw_breakpoint (bp); |
| 1587 | } |
| 1588 | |
| 1589 | void |
| 1590 | uninsert_single_step_breakpoints (struct thread_info *thread) |
| 1591 | { |
| 1592 | struct process_info *proc = get_thread_process (thread); |
| 1593 | struct breakpoint *bp; |
| 1594 | |
| 1595 | for (bp = proc->breakpoints; bp != NULL; bp = bp->next) |
| 1596 | { |
| 1597 | if (bp->type == single_step_breakpoint |
| 1598 | && ((struct single_step_breakpoint *) bp)->ptid == ptid_of (thread)) |
| 1599 | { |
| 1600 | gdb_assert (bp->raw->inserted > 0); |
| 1601 | |
| 1602 | /* Only uninsert the raw breakpoint if it only belongs to a |
| 1603 | reinsert breakpoint. */ |
| 1604 | if (bp->raw->refcount == 1) |
| 1605 | { |
| 1606 | struct thread_info *saved_thread = current_thread; |
| 1607 | |
| 1608 | current_thread = thread; |
| 1609 | uninsert_raw_breakpoint (bp->raw); |
| 1610 | current_thread = saved_thread; |
| 1611 | } |
| 1612 | } |
| 1613 | } |
| 1614 | } |
| 1615 | |
| 1616 | static void |
| 1617 | reinsert_raw_breakpoint (struct raw_breakpoint *bp) |
| 1618 | { |
| 1619 | int err; |
| 1620 | |
| 1621 | if (bp->inserted) |
| 1622 | return; |
| 1623 | |
| 1624 | err = the_target->insert_point (bp->raw_type, bp->pc, bp->kind, bp); |
| 1625 | if (err == 0) |
| 1626 | bp->inserted = 1; |
| 1627 | else if (debug_threads) |
| 1628 | debug_printf ("Failed to reinsert breakpoint at 0x%s (%d).\n", |
| 1629 | paddress (bp->pc), err); |
| 1630 | } |
| 1631 | |
| 1632 | void |
| 1633 | reinsert_breakpoints_at (CORE_ADDR pc) |
| 1634 | { |
| 1635 | struct process_info *proc = current_process (); |
| 1636 | struct raw_breakpoint *bp; |
| 1637 | int found = 0; |
| 1638 | |
| 1639 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) |
| 1640 | if ((bp->raw_type == raw_bkpt_type_sw |
| 1641 | || bp->raw_type == raw_bkpt_type_hw) |
| 1642 | && bp->pc == pc) |
| 1643 | { |
| 1644 | found = 1; |
| 1645 | |
| 1646 | reinsert_raw_breakpoint (bp); |
| 1647 | } |
| 1648 | |
| 1649 | if (!found) |
| 1650 | { |
| 1651 | /* This can happen when we remove all breakpoints while handling |
| 1652 | a step-over. */ |
| 1653 | if (debug_threads) |
| 1654 | debug_printf ("Could not find raw breakpoint at 0x%s " |
| 1655 | "in list (reinserting).\n", |
| 1656 | paddress (pc)); |
| 1657 | } |
| 1658 | } |
| 1659 | |
| 1660 | int |
| 1661 | has_single_step_breakpoints (struct thread_info *thread) |
| 1662 | { |
| 1663 | struct process_info *proc = get_thread_process (thread); |
| 1664 | struct breakpoint *bp, **bp_link; |
| 1665 | |
| 1666 | bp = proc->breakpoints; |
| 1667 | bp_link = &proc->breakpoints; |
| 1668 | |
| 1669 | while (bp) |
| 1670 | { |
| 1671 | if (bp->type == single_step_breakpoint |
| 1672 | && ((struct single_step_breakpoint *) bp)->ptid == ptid_of (thread)) |
| 1673 | return 1; |
| 1674 | else |
| 1675 | { |
| 1676 | bp_link = &bp->next; |
| 1677 | bp = *bp_link; |
| 1678 | } |
| 1679 | } |
| 1680 | |
| 1681 | return 0; |
| 1682 | } |
| 1683 | |
| 1684 | void |
| 1685 | reinsert_all_breakpoints (void) |
| 1686 | { |
| 1687 | struct process_info *proc = current_process (); |
| 1688 | struct raw_breakpoint *bp; |
| 1689 | |
| 1690 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) |
| 1691 | if ((bp->raw_type == raw_bkpt_type_sw |
| 1692 | || bp->raw_type == raw_bkpt_type_hw) |
| 1693 | && !bp->inserted) |
| 1694 | reinsert_raw_breakpoint (bp); |
| 1695 | } |
| 1696 | |
| 1697 | void |
| 1698 | reinsert_single_step_breakpoints (struct thread_info *thread) |
| 1699 | { |
| 1700 | struct process_info *proc = get_thread_process (thread); |
| 1701 | struct breakpoint *bp; |
| 1702 | |
| 1703 | for (bp = proc->breakpoints; bp != NULL; bp = bp->next) |
| 1704 | { |
| 1705 | if (bp->type == single_step_breakpoint |
| 1706 | && ((struct single_step_breakpoint *) bp)->ptid == ptid_of (thread)) |
| 1707 | { |
| 1708 | gdb_assert (bp->raw->inserted > 0); |
| 1709 | |
| 1710 | if (bp->raw->refcount == 1) |
| 1711 | { |
| 1712 | struct thread_info *saved_thread = current_thread; |
| 1713 | |
| 1714 | current_thread = thread; |
| 1715 | reinsert_raw_breakpoint (bp->raw); |
| 1716 | current_thread = saved_thread; |
| 1717 | } |
| 1718 | } |
| 1719 | } |
| 1720 | } |
| 1721 | |
| 1722 | void |
| 1723 | check_breakpoints (CORE_ADDR stop_pc) |
| 1724 | { |
| 1725 | struct process_info *proc = current_process (); |
| 1726 | struct breakpoint *bp, **bp_link; |
| 1727 | |
| 1728 | bp = proc->breakpoints; |
| 1729 | bp_link = &proc->breakpoints; |
| 1730 | |
| 1731 | while (bp) |
| 1732 | { |
| 1733 | struct raw_breakpoint *raw = bp->raw; |
| 1734 | |
| 1735 | if ((raw->raw_type == raw_bkpt_type_sw |
| 1736 | || raw->raw_type == raw_bkpt_type_hw) |
| 1737 | && raw->pc == stop_pc) |
| 1738 | { |
| 1739 | if (!raw->inserted) |
| 1740 | { |
| 1741 | warning ("Hit a removed breakpoint?"); |
| 1742 | return; |
| 1743 | } |
| 1744 | |
| 1745 | if (bp->type == other_breakpoint) |
| 1746 | { |
| 1747 | struct other_breakpoint *other_bp |
| 1748 | = (struct other_breakpoint *) bp; |
| 1749 | |
| 1750 | if (other_bp->handler != NULL && (*other_bp->handler) (stop_pc)) |
| 1751 | { |
| 1752 | *bp_link = bp->next; |
| 1753 | |
| 1754 | release_breakpoint (proc, bp); |
| 1755 | |
| 1756 | bp = *bp_link; |
| 1757 | continue; |
| 1758 | } |
| 1759 | } |
| 1760 | } |
| 1761 | |
| 1762 | bp_link = &bp->next; |
| 1763 | bp = *bp_link; |
| 1764 | } |
| 1765 | } |
| 1766 | |
| 1767 | int |
| 1768 | breakpoint_here (CORE_ADDR addr) |
| 1769 | { |
| 1770 | struct process_info *proc = current_process (); |
| 1771 | struct raw_breakpoint *bp; |
| 1772 | |
| 1773 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) |
| 1774 | if ((bp->raw_type == raw_bkpt_type_sw |
| 1775 | || bp->raw_type == raw_bkpt_type_hw) |
| 1776 | && bp->pc == addr) |
| 1777 | return 1; |
| 1778 | |
| 1779 | return 0; |
| 1780 | } |
| 1781 | |
| 1782 | int |
| 1783 | breakpoint_inserted_here (CORE_ADDR addr) |
| 1784 | { |
| 1785 | struct process_info *proc = current_process (); |
| 1786 | struct raw_breakpoint *bp; |
| 1787 | |
| 1788 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) |
| 1789 | if ((bp->raw_type == raw_bkpt_type_sw |
| 1790 | || bp->raw_type == raw_bkpt_type_hw) |
| 1791 | && bp->pc == addr |
| 1792 | && bp->inserted) |
| 1793 | return 1; |
| 1794 | |
| 1795 | return 0; |
| 1796 | } |
| 1797 | |
| 1798 | /* See mem-break.h. */ |
| 1799 | |
| 1800 | int |
| 1801 | software_breakpoint_inserted_here (CORE_ADDR addr) |
| 1802 | { |
| 1803 | struct process_info *proc = current_process (); |
| 1804 | struct raw_breakpoint *bp; |
| 1805 | |
| 1806 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) |
| 1807 | if (bp->raw_type == raw_bkpt_type_sw |
| 1808 | && bp->pc == addr |
| 1809 | && bp->inserted) |
| 1810 | return 1; |
| 1811 | |
| 1812 | return 0; |
| 1813 | } |
| 1814 | |
| 1815 | /* See mem-break.h. */ |
| 1816 | |
| 1817 | int |
| 1818 | hardware_breakpoint_inserted_here (CORE_ADDR addr) |
| 1819 | { |
| 1820 | struct process_info *proc = current_process (); |
| 1821 | struct raw_breakpoint *bp; |
| 1822 | |
| 1823 | for (bp = proc->raw_breakpoints; bp != NULL; bp = bp->next) |
| 1824 | if (bp->raw_type == raw_bkpt_type_hw |
| 1825 | && bp->pc == addr |
| 1826 | && bp->inserted) |
| 1827 | return 1; |
| 1828 | |
| 1829 | return 0; |
| 1830 | } |
| 1831 | |
| 1832 | /* See mem-break.h. */ |
| 1833 | |
| 1834 | int |
| 1835 | single_step_breakpoint_inserted_here (CORE_ADDR addr) |
| 1836 | { |
| 1837 | struct process_info *proc = current_process (); |
| 1838 | struct breakpoint *bp; |
| 1839 | |
| 1840 | for (bp = proc->breakpoints; bp != NULL; bp = bp->next) |
| 1841 | if (bp->type == single_step_breakpoint |
| 1842 | && bp->raw->pc == addr |
| 1843 | && bp->raw->inserted) |
| 1844 | return 1; |
| 1845 | |
| 1846 | return 0; |
| 1847 | } |
| 1848 | |
| 1849 | static int |
| 1850 | validate_inserted_breakpoint (struct raw_breakpoint *bp) |
| 1851 | { |
| 1852 | unsigned char *buf; |
| 1853 | int err; |
| 1854 | |
| 1855 | gdb_assert (bp->inserted); |
| 1856 | gdb_assert (bp->raw_type == raw_bkpt_type_sw); |
| 1857 | |
| 1858 | buf = (unsigned char *) alloca (bp_size (bp)); |
| 1859 | err = the_target->read_memory (bp->pc, buf, bp_size (bp)); |
| 1860 | if (err || memcmp (buf, bp_opcode (bp), bp_size (bp)) != 0) |
| 1861 | { |
| 1862 | /* Tag it as gone. */ |
| 1863 | bp->inserted = -1; |
| 1864 | return 0; |
| 1865 | } |
| 1866 | |
| 1867 | return 1; |
| 1868 | } |
| 1869 | |
| 1870 | static void |
| 1871 | delete_disabled_breakpoints (void) |
| 1872 | { |
| 1873 | struct process_info *proc = current_process (); |
| 1874 | struct breakpoint *bp, *next; |
| 1875 | |
| 1876 | for (bp = proc->breakpoints; bp != NULL; bp = next) |
| 1877 | { |
| 1878 | next = bp->next; |
| 1879 | if (bp->raw->inserted < 0) |
| 1880 | { |
| 1881 | /* If single_step_breakpoints become disabled, that means the |
| 1882 | manipulations (insertion and removal) of them are wrong. */ |
| 1883 | gdb_assert (bp->type != single_step_breakpoint); |
| 1884 | delete_breakpoint_1 (proc, bp); |
| 1885 | } |
| 1886 | } |
| 1887 | } |
| 1888 | |
| 1889 | /* Check if breakpoints we inserted still appear to be inserted. They |
| 1890 | may disappear due to a shared library unload, and worse, a new |
| 1891 | shared library may be reloaded at the same address as the |
| 1892 | previously unloaded one. If that happens, we should make sure that |
| 1893 | the shadow memory of the old breakpoints isn't used when reading or |
| 1894 | writing memory. */ |
| 1895 | |
| 1896 | void |
| 1897 | validate_breakpoints (void) |
| 1898 | { |
| 1899 | struct process_info *proc = current_process (); |
| 1900 | struct breakpoint *bp; |
| 1901 | |
| 1902 | for (bp = proc->breakpoints; bp != NULL; bp = bp->next) |
| 1903 | { |
| 1904 | struct raw_breakpoint *raw = bp->raw; |
| 1905 | |
| 1906 | if (raw->raw_type == raw_bkpt_type_sw && raw->inserted > 0) |
| 1907 | validate_inserted_breakpoint (raw); |
| 1908 | } |
| 1909 | |
| 1910 | delete_disabled_breakpoints (); |
| 1911 | } |
| 1912 | |
| 1913 | void |
| 1914 | check_mem_read (CORE_ADDR mem_addr, unsigned char *buf, int mem_len) |
| 1915 | { |
| 1916 | struct process_info *proc = current_process (); |
| 1917 | struct raw_breakpoint *bp = proc->raw_breakpoints; |
| 1918 | struct fast_tracepoint_jump *jp = proc->fast_tracepoint_jumps; |
| 1919 | CORE_ADDR mem_end = mem_addr + mem_len; |
| 1920 | int disabled_one = 0; |
| 1921 | |
| 1922 | for (; jp != NULL; jp = jp->next) |
| 1923 | { |
| 1924 | CORE_ADDR bp_end = jp->pc + jp->length; |
| 1925 | CORE_ADDR start, end; |
| 1926 | int copy_offset, copy_len, buf_offset; |
| 1927 | |
| 1928 | gdb_assert (fast_tracepoint_jump_shadow (jp) >= buf + mem_len |
| 1929 | || buf >= fast_tracepoint_jump_shadow (jp) + (jp)->length); |
| 1930 | |
| 1931 | if (mem_addr >= bp_end) |
| 1932 | continue; |
| 1933 | if (jp->pc >= mem_end) |
| 1934 | continue; |
| 1935 | |
| 1936 | start = jp->pc; |
| 1937 | if (mem_addr > start) |
| 1938 | start = mem_addr; |
| 1939 | |
| 1940 | end = bp_end; |
| 1941 | if (end > mem_end) |
| 1942 | end = mem_end; |
| 1943 | |
| 1944 | copy_len = end - start; |
| 1945 | copy_offset = start - jp->pc; |
| 1946 | buf_offset = start - mem_addr; |
| 1947 | |
| 1948 | if (jp->inserted) |
| 1949 | memcpy (buf + buf_offset, |
| 1950 | fast_tracepoint_jump_shadow (jp) + copy_offset, |
| 1951 | copy_len); |
| 1952 | } |
| 1953 | |
| 1954 | for (; bp != NULL; bp = bp->next) |
| 1955 | { |
| 1956 | CORE_ADDR bp_end = bp->pc + bp_size (bp); |
| 1957 | CORE_ADDR start, end; |
| 1958 | int copy_offset, copy_len, buf_offset; |
| 1959 | |
| 1960 | if (bp->raw_type != raw_bkpt_type_sw) |
| 1961 | continue; |
| 1962 | |
| 1963 | gdb_assert (bp->old_data >= buf + mem_len |
| 1964 | || buf >= &bp->old_data[sizeof (bp->old_data)]); |
| 1965 | |
| 1966 | if (mem_addr >= bp_end) |
| 1967 | continue; |
| 1968 | if (bp->pc >= mem_end) |
| 1969 | continue; |
| 1970 | |
| 1971 | start = bp->pc; |
| 1972 | if (mem_addr > start) |
| 1973 | start = mem_addr; |
| 1974 | |
| 1975 | end = bp_end; |
| 1976 | if (end > mem_end) |
| 1977 | end = mem_end; |
| 1978 | |
| 1979 | copy_len = end - start; |
| 1980 | copy_offset = start - bp->pc; |
| 1981 | buf_offset = start - mem_addr; |
| 1982 | |
| 1983 | if (bp->inserted > 0) |
| 1984 | { |
| 1985 | if (validate_inserted_breakpoint (bp)) |
| 1986 | memcpy (buf + buf_offset, bp->old_data + copy_offset, copy_len); |
| 1987 | else |
| 1988 | disabled_one = 1; |
| 1989 | } |
| 1990 | } |
| 1991 | |
| 1992 | if (disabled_one) |
| 1993 | delete_disabled_breakpoints (); |
| 1994 | } |
| 1995 | |
| 1996 | void |
| 1997 | check_mem_write (CORE_ADDR mem_addr, unsigned char *buf, |
| 1998 | const unsigned char *myaddr, int mem_len) |
| 1999 | { |
| 2000 | struct process_info *proc = current_process (); |
| 2001 | struct raw_breakpoint *bp = proc->raw_breakpoints; |
| 2002 | struct fast_tracepoint_jump *jp = proc->fast_tracepoint_jumps; |
| 2003 | CORE_ADDR mem_end = mem_addr + mem_len; |
| 2004 | int disabled_one = 0; |
| 2005 | |
| 2006 | /* First fast tracepoint jumps, then breakpoint traps on top. */ |
| 2007 | |
| 2008 | for (; jp != NULL; jp = jp->next) |
| 2009 | { |
| 2010 | CORE_ADDR jp_end = jp->pc + jp->length; |
| 2011 | CORE_ADDR start, end; |
| 2012 | int copy_offset, copy_len, buf_offset; |
| 2013 | |
| 2014 | gdb_assert (fast_tracepoint_jump_shadow (jp) >= myaddr + mem_len |
| 2015 | || myaddr >= fast_tracepoint_jump_shadow (jp) + (jp)->length); |
| 2016 | gdb_assert (fast_tracepoint_jump_insn (jp) >= buf + mem_len |
| 2017 | || buf >= fast_tracepoint_jump_insn (jp) + (jp)->length); |
| 2018 | |
| 2019 | if (mem_addr >= jp_end) |
| 2020 | continue; |
| 2021 | if (jp->pc >= mem_end) |
| 2022 | continue; |
| 2023 | |
| 2024 | start = jp->pc; |
| 2025 | if (mem_addr > start) |
| 2026 | start = mem_addr; |
| 2027 | |
| 2028 | end = jp_end; |
| 2029 | if (end > mem_end) |
| 2030 | end = mem_end; |
| 2031 | |
| 2032 | copy_len = end - start; |
| 2033 | copy_offset = start - jp->pc; |
| 2034 | buf_offset = start - mem_addr; |
| 2035 | |
| 2036 | memcpy (fast_tracepoint_jump_shadow (jp) + copy_offset, |
| 2037 | myaddr + buf_offset, copy_len); |
| 2038 | if (jp->inserted) |
| 2039 | memcpy (buf + buf_offset, |
| 2040 | fast_tracepoint_jump_insn (jp) + copy_offset, copy_len); |
| 2041 | } |
| 2042 | |
| 2043 | for (; bp != NULL; bp = bp->next) |
| 2044 | { |
| 2045 | CORE_ADDR bp_end = bp->pc + bp_size (bp); |
| 2046 | CORE_ADDR start, end; |
| 2047 | int copy_offset, copy_len, buf_offset; |
| 2048 | |
| 2049 | if (bp->raw_type != raw_bkpt_type_sw) |
| 2050 | continue; |
| 2051 | |
| 2052 | gdb_assert (bp->old_data >= myaddr + mem_len |
| 2053 | || myaddr >= &bp->old_data[sizeof (bp->old_data)]); |
| 2054 | |
| 2055 | if (mem_addr >= bp_end) |
| 2056 | continue; |
| 2057 | if (bp->pc >= mem_end) |
| 2058 | continue; |
| 2059 | |
| 2060 | start = bp->pc; |
| 2061 | if (mem_addr > start) |
| 2062 | start = mem_addr; |
| 2063 | |
| 2064 | end = bp_end; |
| 2065 | if (end > mem_end) |
| 2066 | end = mem_end; |
| 2067 | |
| 2068 | copy_len = end - start; |
| 2069 | copy_offset = start - bp->pc; |
| 2070 | buf_offset = start - mem_addr; |
| 2071 | |
| 2072 | memcpy (bp->old_data + copy_offset, myaddr + buf_offset, copy_len); |
| 2073 | if (bp->inserted > 0) |
| 2074 | { |
| 2075 | if (validate_inserted_breakpoint (bp)) |
| 2076 | memcpy (buf + buf_offset, bp_opcode (bp) + copy_offset, copy_len); |
| 2077 | else |
| 2078 | disabled_one = 1; |
| 2079 | } |
| 2080 | } |
| 2081 | |
| 2082 | if (disabled_one) |
| 2083 | delete_disabled_breakpoints (); |
| 2084 | } |
| 2085 | |
| 2086 | /* Delete all breakpoints, and un-insert them from the inferior. */ |
| 2087 | |
| 2088 | void |
| 2089 | delete_all_breakpoints (void) |
| 2090 | { |
| 2091 | struct process_info *proc = current_process (); |
| 2092 | |
| 2093 | while (proc->breakpoints) |
| 2094 | delete_breakpoint_1 (proc, proc->breakpoints); |
| 2095 | } |
| 2096 | |
| 2097 | /* Clear the "inserted" flag in all breakpoints. */ |
| 2098 | |
| 2099 | void |
| 2100 | mark_breakpoints_out (struct process_info *proc) |
| 2101 | { |
| 2102 | struct raw_breakpoint *raw_bp; |
| 2103 | |
| 2104 | for (raw_bp = proc->raw_breakpoints; raw_bp != NULL; raw_bp = raw_bp->next) |
| 2105 | raw_bp->inserted = 0; |
| 2106 | } |
| 2107 | |
| 2108 | /* Release all breakpoints, but do not try to un-insert them from the |
| 2109 | inferior. */ |
| 2110 | |
| 2111 | void |
| 2112 | free_all_breakpoints (struct process_info *proc) |
| 2113 | { |
| 2114 | mark_breakpoints_out (proc); |
| 2115 | |
| 2116 | /* Note: use PROC explicitly instead of deferring to |
| 2117 | delete_all_breakpoints --- CURRENT_INFERIOR may already have been |
| 2118 | released when we get here. There should be no call to |
| 2119 | current_process from here on. */ |
| 2120 | while (proc->breakpoints) |
| 2121 | delete_breakpoint_1 (proc, proc->breakpoints); |
| 2122 | } |
| 2123 | |
| 2124 | /* Clone an agent expression. */ |
| 2125 | |
| 2126 | static struct agent_expr * |
| 2127 | clone_agent_expr (const struct agent_expr *src_ax) |
| 2128 | { |
| 2129 | struct agent_expr *ax; |
| 2130 | |
| 2131 | ax = XCNEW (struct agent_expr); |
| 2132 | ax->length = src_ax->length; |
| 2133 | ax->bytes = (unsigned char *) xcalloc (ax->length, 1); |
| 2134 | memcpy (ax->bytes, src_ax->bytes, ax->length); |
| 2135 | return ax; |
| 2136 | } |
| 2137 | |
| 2138 | /* Deep-copy the contents of one breakpoint to another. */ |
| 2139 | |
| 2140 | static struct breakpoint * |
| 2141 | clone_one_breakpoint (const struct breakpoint *src, ptid_t ptid) |
| 2142 | { |
| 2143 | struct breakpoint *dest; |
| 2144 | struct raw_breakpoint *dest_raw; |
| 2145 | |
| 2146 | /* Clone the raw breakpoint. */ |
| 2147 | dest_raw = XCNEW (struct raw_breakpoint); |
| 2148 | dest_raw->raw_type = src->raw->raw_type; |
| 2149 | dest_raw->refcount = src->raw->refcount; |
| 2150 | dest_raw->pc = src->raw->pc; |
| 2151 | dest_raw->kind = src->raw->kind; |
| 2152 | memcpy (dest_raw->old_data, src->raw->old_data, MAX_BREAKPOINT_LEN); |
| 2153 | dest_raw->inserted = src->raw->inserted; |
| 2154 | |
| 2155 | /* Clone the high-level breakpoint. */ |
| 2156 | if (is_gdb_breakpoint (src->type)) |
| 2157 | { |
| 2158 | struct gdb_breakpoint *gdb_dest = XCNEW (struct gdb_breakpoint); |
| 2159 | struct point_cond_list *current_cond; |
| 2160 | struct point_cond_list *new_cond; |
| 2161 | struct point_cond_list *cond_tail = NULL; |
| 2162 | struct point_command_list *current_cmd; |
| 2163 | struct point_command_list *new_cmd; |
| 2164 | struct point_command_list *cmd_tail = NULL; |
| 2165 | |
| 2166 | /* Clone the condition list. */ |
| 2167 | for (current_cond = ((struct gdb_breakpoint *) src)->cond_list; |
| 2168 | current_cond != NULL; |
| 2169 | current_cond = current_cond->next) |
| 2170 | { |
| 2171 | new_cond = XCNEW (struct point_cond_list); |
| 2172 | new_cond->cond = clone_agent_expr (current_cond->cond); |
| 2173 | APPEND_TO_LIST (&gdb_dest->cond_list, new_cond, cond_tail); |
| 2174 | } |
| 2175 | |
| 2176 | /* Clone the command list. */ |
| 2177 | for (current_cmd = ((struct gdb_breakpoint *) src)->command_list; |
| 2178 | current_cmd != NULL; |
| 2179 | current_cmd = current_cmd->next) |
| 2180 | { |
| 2181 | new_cmd = XCNEW (struct point_command_list); |
| 2182 | new_cmd->cmd = clone_agent_expr (current_cmd->cmd); |
| 2183 | new_cmd->persistence = current_cmd->persistence; |
| 2184 | APPEND_TO_LIST (&gdb_dest->command_list, new_cmd, cmd_tail); |
| 2185 | } |
| 2186 | |
| 2187 | dest = (struct breakpoint *) gdb_dest; |
| 2188 | } |
| 2189 | else if (src->type == other_breakpoint) |
| 2190 | { |
| 2191 | struct other_breakpoint *other_dest = XCNEW (struct other_breakpoint); |
| 2192 | |
| 2193 | other_dest->handler = ((struct other_breakpoint *) src)->handler; |
| 2194 | dest = (struct breakpoint *) other_dest; |
| 2195 | } |
| 2196 | else if (src->type == single_step_breakpoint) |
| 2197 | { |
| 2198 | struct single_step_breakpoint *ss_dest |
| 2199 | = XCNEW (struct single_step_breakpoint); |
| 2200 | |
| 2201 | dest = (struct breakpoint *) ss_dest; |
| 2202 | /* Since single-step breakpoint is thread specific, don't copy |
| 2203 | thread id from SRC, use ID instead. */ |
| 2204 | ss_dest->ptid = ptid; |
| 2205 | } |
| 2206 | else |
| 2207 | gdb_assert_not_reached ("unhandled breakpoint type"); |
| 2208 | |
| 2209 | dest->type = src->type; |
| 2210 | dest->raw = dest_raw; |
| 2211 | |
| 2212 | return dest; |
| 2213 | } |
| 2214 | |
| 2215 | /* See mem-break.h. */ |
| 2216 | |
| 2217 | void |
| 2218 | clone_all_breakpoints (struct thread_info *child_thread, |
| 2219 | const struct thread_info *parent_thread) |
| 2220 | { |
| 2221 | const struct breakpoint *bp; |
| 2222 | struct breakpoint *new_bkpt; |
| 2223 | struct breakpoint *bkpt_tail = NULL; |
| 2224 | struct raw_breakpoint *raw_bkpt_tail = NULL; |
| 2225 | struct process_info *child_proc = get_thread_process (child_thread); |
| 2226 | struct process_info *parent_proc = get_thread_process (parent_thread); |
| 2227 | struct breakpoint **new_list = &child_proc->breakpoints; |
| 2228 | struct raw_breakpoint **new_raw_list = &child_proc->raw_breakpoints; |
| 2229 | |
| 2230 | for (bp = parent_proc->breakpoints; bp != NULL; bp = bp->next) |
| 2231 | { |
| 2232 | new_bkpt = clone_one_breakpoint (bp, ptid_of (child_thread)); |
| 2233 | APPEND_TO_LIST (new_list, new_bkpt, bkpt_tail); |
| 2234 | APPEND_TO_LIST (new_raw_list, new_bkpt->raw, raw_bkpt_tail); |
| 2235 | } |
| 2236 | } |