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