| 1 | /* Cache and manage the values of registers for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1986-2016 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "inferior.h" |
| 22 | #include "target.h" |
| 23 | #include "gdbarch.h" |
| 24 | #include "gdbcmd.h" |
| 25 | #include "regcache.h" |
| 26 | #include "reggroups.h" |
| 27 | #include "observer.h" |
| 28 | #include "remote.h" |
| 29 | #include "valprint.h" |
| 30 | #include "regset.h" |
| 31 | |
| 32 | /* |
| 33 | * DATA STRUCTURE |
| 34 | * |
| 35 | * Here is the actual register cache. |
| 36 | */ |
| 37 | |
| 38 | /* Per-architecture object describing the layout of a register cache. |
| 39 | Computed once when the architecture is created. */ |
| 40 | |
| 41 | struct gdbarch_data *regcache_descr_handle; |
| 42 | |
| 43 | struct regcache_descr |
| 44 | { |
| 45 | /* The architecture this descriptor belongs to. */ |
| 46 | struct gdbarch *gdbarch; |
| 47 | |
| 48 | /* The raw register cache. Each raw (or hard) register is supplied |
| 49 | by the target interface. The raw cache should not contain |
| 50 | redundant information - if the PC is constructed from two |
| 51 | registers then those registers and not the PC lives in the raw |
| 52 | cache. */ |
| 53 | int nr_raw_registers; |
| 54 | long sizeof_raw_registers; |
| 55 | long sizeof_raw_register_status; |
| 56 | |
| 57 | /* The cooked register space. Each cooked register in the range |
| 58 | [0..NR_RAW_REGISTERS) is direct-mapped onto the corresponding raw |
| 59 | register. The remaining [NR_RAW_REGISTERS |
| 60 | .. NR_COOKED_REGISTERS) (a.k.a. pseudo registers) are mapped onto |
| 61 | both raw registers and memory by the architecture methods |
| 62 | gdbarch_pseudo_register_read and gdbarch_pseudo_register_write. */ |
| 63 | int nr_cooked_registers; |
| 64 | long sizeof_cooked_registers; |
| 65 | long sizeof_cooked_register_status; |
| 66 | |
| 67 | /* Offset and size (in 8 bit bytes), of each register in the |
| 68 | register cache. All registers (including those in the range |
| 69 | [NR_RAW_REGISTERS .. NR_COOKED_REGISTERS) are given an |
| 70 | offset. */ |
| 71 | long *register_offset; |
| 72 | long *sizeof_register; |
| 73 | |
| 74 | /* Cached table containing the type of each register. */ |
| 75 | struct type **register_type; |
| 76 | }; |
| 77 | |
| 78 | static void * |
| 79 | init_regcache_descr (struct gdbarch *gdbarch) |
| 80 | { |
| 81 | int i; |
| 82 | struct regcache_descr *descr; |
| 83 | gdb_assert (gdbarch != NULL); |
| 84 | |
| 85 | /* Create an initial, zero filled, table. */ |
| 86 | descr = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct regcache_descr); |
| 87 | descr->gdbarch = gdbarch; |
| 88 | |
| 89 | /* Total size of the register space. The raw registers are mapped |
| 90 | directly onto the raw register cache while the pseudo's are |
| 91 | either mapped onto raw-registers or memory. */ |
| 92 | descr->nr_cooked_registers = gdbarch_num_regs (gdbarch) |
| 93 | + gdbarch_num_pseudo_regs (gdbarch); |
| 94 | descr->sizeof_cooked_register_status |
| 95 | = gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch); |
| 96 | |
| 97 | /* Fill in a table of register types. */ |
| 98 | descr->register_type |
| 99 | = GDBARCH_OBSTACK_CALLOC (gdbarch, descr->nr_cooked_registers, |
| 100 | struct type *); |
| 101 | for (i = 0; i < descr->nr_cooked_registers; i++) |
| 102 | descr->register_type[i] = gdbarch_register_type (gdbarch, i); |
| 103 | |
| 104 | /* Construct a strictly RAW register cache. Don't allow pseudo's |
| 105 | into the register cache. */ |
| 106 | descr->nr_raw_registers = gdbarch_num_regs (gdbarch); |
| 107 | descr->sizeof_raw_register_status = gdbarch_num_regs (gdbarch); |
| 108 | |
| 109 | /* Lay out the register cache. |
| 110 | |
| 111 | NOTE: cagney/2002-05-22: Only register_type() is used when |
| 112 | constructing the register cache. It is assumed that the |
| 113 | register's raw size, virtual size and type length are all the |
| 114 | same. */ |
| 115 | |
| 116 | { |
| 117 | long offset = 0; |
| 118 | |
| 119 | descr->sizeof_register |
| 120 | = GDBARCH_OBSTACK_CALLOC (gdbarch, descr->nr_cooked_registers, long); |
| 121 | descr->register_offset |
| 122 | = GDBARCH_OBSTACK_CALLOC (gdbarch, descr->nr_cooked_registers, long); |
| 123 | for (i = 0; i < descr->nr_raw_registers; i++) |
| 124 | { |
| 125 | descr->sizeof_register[i] = TYPE_LENGTH (descr->register_type[i]); |
| 126 | descr->register_offset[i] = offset; |
| 127 | offset += descr->sizeof_register[i]; |
| 128 | gdb_assert (MAX_REGISTER_SIZE >= descr->sizeof_register[i]); |
| 129 | } |
| 130 | /* Set the real size of the raw register cache buffer. */ |
| 131 | descr->sizeof_raw_registers = offset; |
| 132 | |
| 133 | for (; i < descr->nr_cooked_registers; i++) |
| 134 | { |
| 135 | descr->sizeof_register[i] = TYPE_LENGTH (descr->register_type[i]); |
| 136 | descr->register_offset[i] = offset; |
| 137 | offset += descr->sizeof_register[i]; |
| 138 | gdb_assert (MAX_REGISTER_SIZE >= descr->sizeof_register[i]); |
| 139 | } |
| 140 | /* Set the real size of the readonly register cache buffer. */ |
| 141 | descr->sizeof_cooked_registers = offset; |
| 142 | } |
| 143 | |
| 144 | return descr; |
| 145 | } |
| 146 | |
| 147 | static struct regcache_descr * |
| 148 | regcache_descr (struct gdbarch *gdbarch) |
| 149 | { |
| 150 | return (struct regcache_descr *) gdbarch_data (gdbarch, |
| 151 | regcache_descr_handle); |
| 152 | } |
| 153 | |
| 154 | /* Utility functions returning useful register attributes stored in |
| 155 | the regcache descr. */ |
| 156 | |
| 157 | struct type * |
| 158 | register_type (struct gdbarch *gdbarch, int regnum) |
| 159 | { |
| 160 | struct regcache_descr *descr = regcache_descr (gdbarch); |
| 161 | |
| 162 | gdb_assert (regnum >= 0 && regnum < descr->nr_cooked_registers); |
| 163 | return descr->register_type[regnum]; |
| 164 | } |
| 165 | |
| 166 | /* Utility functions returning useful register attributes stored in |
| 167 | the regcache descr. */ |
| 168 | |
| 169 | int |
| 170 | register_size (struct gdbarch *gdbarch, int regnum) |
| 171 | { |
| 172 | struct regcache_descr *descr = regcache_descr (gdbarch); |
| 173 | int size; |
| 174 | |
| 175 | gdb_assert (regnum >= 0 |
| 176 | && regnum < (gdbarch_num_regs (gdbarch) |
| 177 | + gdbarch_num_pseudo_regs (gdbarch))); |
| 178 | size = descr->sizeof_register[regnum]; |
| 179 | return size; |
| 180 | } |
| 181 | |
| 182 | /* See common/common-regcache.h. */ |
| 183 | |
| 184 | int |
| 185 | regcache_register_size (const struct regcache *regcache, int n) |
| 186 | { |
| 187 | return register_size (get_regcache_arch (regcache), n); |
| 188 | } |
| 189 | |
| 190 | /* The register cache for storing raw register values. */ |
| 191 | |
| 192 | struct regcache |
| 193 | { |
| 194 | struct regcache_descr *descr; |
| 195 | |
| 196 | /* The address space of this register cache (for registers where it |
| 197 | makes sense, like PC or SP). */ |
| 198 | struct address_space *aspace; |
| 199 | |
| 200 | /* The register buffers. A read-only register cache can hold the |
| 201 | full [0 .. gdbarch_num_regs + gdbarch_num_pseudo_regs) while a read/write |
| 202 | register cache can only hold [0 .. gdbarch_num_regs). */ |
| 203 | gdb_byte *registers; |
| 204 | /* Register cache status. */ |
| 205 | signed char *register_status; |
| 206 | /* Is this a read-only cache? A read-only cache is used for saving |
| 207 | the target's register state (e.g, across an inferior function |
| 208 | call or just before forcing a function return). A read-only |
| 209 | cache can only be updated via the methods regcache_dup() and |
| 210 | regcache_cpy(). The actual contents are determined by the |
| 211 | reggroup_save and reggroup_restore methods. */ |
| 212 | int readonly_p; |
| 213 | /* If this is a read-write cache, which thread's registers is |
| 214 | it connected to? */ |
| 215 | ptid_t ptid; |
| 216 | }; |
| 217 | |
| 218 | static struct regcache * |
| 219 | regcache_xmalloc_1 (struct gdbarch *gdbarch, struct address_space *aspace, |
| 220 | int readonly_p) |
| 221 | { |
| 222 | struct regcache_descr *descr; |
| 223 | struct regcache *regcache; |
| 224 | |
| 225 | gdb_assert (gdbarch != NULL); |
| 226 | descr = regcache_descr (gdbarch); |
| 227 | regcache = XNEW (struct regcache); |
| 228 | regcache->descr = descr; |
| 229 | regcache->readonly_p = readonly_p; |
| 230 | if (readonly_p) |
| 231 | { |
| 232 | regcache->registers |
| 233 | = XCNEWVEC (gdb_byte, descr->sizeof_cooked_registers); |
| 234 | regcache->register_status |
| 235 | = XCNEWVEC (signed char, descr->sizeof_cooked_register_status); |
| 236 | } |
| 237 | else |
| 238 | { |
| 239 | regcache->registers |
| 240 | = XCNEWVEC (gdb_byte, descr->sizeof_raw_registers); |
| 241 | regcache->register_status |
| 242 | = XCNEWVEC (signed char, descr->sizeof_raw_register_status); |
| 243 | } |
| 244 | regcache->aspace = aspace; |
| 245 | regcache->ptid = minus_one_ptid; |
| 246 | return regcache; |
| 247 | } |
| 248 | |
| 249 | struct regcache * |
| 250 | regcache_xmalloc (struct gdbarch *gdbarch, struct address_space *aspace) |
| 251 | { |
| 252 | return regcache_xmalloc_1 (gdbarch, aspace, 1); |
| 253 | } |
| 254 | |
| 255 | void |
| 256 | regcache_xfree (struct regcache *regcache) |
| 257 | { |
| 258 | if (regcache == NULL) |
| 259 | return; |
| 260 | xfree (regcache->registers); |
| 261 | xfree (regcache->register_status); |
| 262 | xfree (regcache); |
| 263 | } |
| 264 | |
| 265 | static void |
| 266 | do_regcache_xfree (void *data) |
| 267 | { |
| 268 | regcache_xfree ((struct regcache *) data); |
| 269 | } |
| 270 | |
| 271 | struct cleanup * |
| 272 | make_cleanup_regcache_xfree (struct regcache *regcache) |
| 273 | { |
| 274 | return make_cleanup (do_regcache_xfree, regcache); |
| 275 | } |
| 276 | |
| 277 | /* Cleanup routines for invalidating a register. */ |
| 278 | |
| 279 | struct register_to_invalidate |
| 280 | { |
| 281 | struct regcache *regcache; |
| 282 | int regnum; |
| 283 | }; |
| 284 | |
| 285 | static void |
| 286 | do_regcache_invalidate (void *data) |
| 287 | { |
| 288 | struct register_to_invalidate *reg = (struct register_to_invalidate *) data; |
| 289 | |
| 290 | regcache_invalidate (reg->regcache, reg->regnum); |
| 291 | } |
| 292 | |
| 293 | static struct cleanup * |
| 294 | make_cleanup_regcache_invalidate (struct regcache *regcache, int regnum) |
| 295 | { |
| 296 | struct register_to_invalidate* reg = XNEW (struct register_to_invalidate); |
| 297 | |
| 298 | reg->regcache = regcache; |
| 299 | reg->regnum = regnum; |
| 300 | return make_cleanup_dtor (do_regcache_invalidate, (void *) reg, xfree); |
| 301 | } |
| 302 | |
| 303 | /* Return REGCACHE's architecture. */ |
| 304 | |
| 305 | struct gdbarch * |
| 306 | get_regcache_arch (const struct regcache *regcache) |
| 307 | { |
| 308 | return regcache->descr->gdbarch; |
| 309 | } |
| 310 | |
| 311 | struct address_space * |
| 312 | get_regcache_aspace (const struct regcache *regcache) |
| 313 | { |
| 314 | return regcache->aspace; |
| 315 | } |
| 316 | |
| 317 | /* Return a pointer to register REGNUM's buffer cache. */ |
| 318 | |
| 319 | static gdb_byte * |
| 320 | register_buffer (const struct regcache *regcache, int regnum) |
| 321 | { |
| 322 | return regcache->registers + regcache->descr->register_offset[regnum]; |
| 323 | } |
| 324 | |
| 325 | void |
| 326 | regcache_save (struct regcache *dst, regcache_cooked_read_ftype *cooked_read, |
| 327 | void *src) |
| 328 | { |
| 329 | struct gdbarch *gdbarch = dst->descr->gdbarch; |
| 330 | gdb_byte buf[MAX_REGISTER_SIZE]; |
| 331 | int regnum; |
| 332 | |
| 333 | /* The DST should be `read-only', if it wasn't then the save would |
| 334 | end up trying to write the register values back out to the |
| 335 | target. */ |
| 336 | gdb_assert (dst->readonly_p); |
| 337 | /* Clear the dest. */ |
| 338 | memset (dst->registers, 0, dst->descr->sizeof_cooked_registers); |
| 339 | memset (dst->register_status, 0, |
| 340 | dst->descr->sizeof_cooked_register_status); |
| 341 | /* Copy over any registers (identified by their membership in the |
| 342 | save_reggroup) and mark them as valid. The full [0 .. gdbarch_num_regs + |
| 343 | gdbarch_num_pseudo_regs) range is checked since some architectures need |
| 344 | to save/restore `cooked' registers that live in memory. */ |
| 345 | for (regnum = 0; regnum < dst->descr->nr_cooked_registers; regnum++) |
| 346 | { |
| 347 | if (gdbarch_register_reggroup_p (gdbarch, regnum, save_reggroup)) |
| 348 | { |
| 349 | enum register_status status = cooked_read (src, regnum, buf); |
| 350 | |
| 351 | if (status == REG_VALID) |
| 352 | memcpy (register_buffer (dst, regnum), buf, |
| 353 | register_size (gdbarch, regnum)); |
| 354 | else |
| 355 | { |
| 356 | gdb_assert (status != REG_UNKNOWN); |
| 357 | |
| 358 | memset (register_buffer (dst, regnum), 0, |
| 359 | register_size (gdbarch, regnum)); |
| 360 | } |
| 361 | dst->register_status[regnum] = status; |
| 362 | } |
| 363 | } |
| 364 | } |
| 365 | |
| 366 | static void |
| 367 | regcache_restore (struct regcache *dst, |
| 368 | regcache_cooked_read_ftype *cooked_read, |
| 369 | void *cooked_read_context) |
| 370 | { |
| 371 | struct gdbarch *gdbarch = dst->descr->gdbarch; |
| 372 | gdb_byte buf[MAX_REGISTER_SIZE]; |
| 373 | int regnum; |
| 374 | |
| 375 | /* The dst had better not be read-only. If it is, the `restore' |
| 376 | doesn't make much sense. */ |
| 377 | gdb_assert (!dst->readonly_p); |
| 378 | /* Copy over any registers, being careful to only restore those that |
| 379 | were both saved and need to be restored. The full [0 .. gdbarch_num_regs |
| 380 | + gdbarch_num_pseudo_regs) range is checked since some architectures need |
| 381 | to save/restore `cooked' registers that live in memory. */ |
| 382 | for (regnum = 0; regnum < dst->descr->nr_cooked_registers; regnum++) |
| 383 | { |
| 384 | if (gdbarch_register_reggroup_p (gdbarch, regnum, restore_reggroup)) |
| 385 | { |
| 386 | enum register_status status; |
| 387 | |
| 388 | status = cooked_read (cooked_read_context, regnum, buf); |
| 389 | if (status == REG_VALID) |
| 390 | regcache_cooked_write (dst, regnum, buf); |
| 391 | } |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | static enum register_status |
| 396 | do_cooked_read (void *src, int regnum, gdb_byte *buf) |
| 397 | { |
| 398 | struct regcache *regcache = (struct regcache *) src; |
| 399 | |
| 400 | return regcache_cooked_read (regcache, regnum, buf); |
| 401 | } |
| 402 | |
| 403 | static void regcache_cpy_no_passthrough (struct regcache *dst, |
| 404 | struct regcache *src); |
| 405 | |
| 406 | void |
| 407 | regcache_cpy (struct regcache *dst, struct regcache *src) |
| 408 | { |
| 409 | gdb_assert (src != NULL && dst != NULL); |
| 410 | gdb_assert (src->descr->gdbarch == dst->descr->gdbarch); |
| 411 | gdb_assert (src != dst); |
| 412 | gdb_assert (src->readonly_p || dst->readonly_p); |
| 413 | |
| 414 | if (!src->readonly_p) |
| 415 | regcache_save (dst, do_cooked_read, src); |
| 416 | else if (!dst->readonly_p) |
| 417 | regcache_restore (dst, do_cooked_read, src); |
| 418 | else |
| 419 | regcache_cpy_no_passthrough (dst, src); |
| 420 | } |
| 421 | |
| 422 | /* Copy/duplicate the contents of a register cache. Unlike regcache_cpy, |
| 423 | which is pass-through, this does not go through to the target. |
| 424 | Only values values already in the cache are transferred. The SRC and DST |
| 425 | buffers must not overlap. */ |
| 426 | |
| 427 | static void |
| 428 | regcache_cpy_no_passthrough (struct regcache *dst, struct regcache *src) |
| 429 | { |
| 430 | gdb_assert (src != NULL && dst != NULL); |
| 431 | gdb_assert (src->descr->gdbarch == dst->descr->gdbarch); |
| 432 | /* NOTE: cagney/2002-05-17: Don't let the caller do a no-passthrough |
| 433 | move of data into a thread's regcache. Doing this would be silly |
| 434 | - it would mean that regcache->register_status would be |
| 435 | completely invalid. */ |
| 436 | gdb_assert (dst->readonly_p && src->readonly_p); |
| 437 | |
| 438 | memcpy (dst->registers, src->registers, |
| 439 | dst->descr->sizeof_cooked_registers); |
| 440 | memcpy (dst->register_status, src->register_status, |
| 441 | dst->descr->sizeof_cooked_register_status); |
| 442 | } |
| 443 | |
| 444 | struct regcache * |
| 445 | regcache_dup (struct regcache *src) |
| 446 | { |
| 447 | struct regcache *newbuf; |
| 448 | |
| 449 | newbuf = regcache_xmalloc (src->descr->gdbarch, get_regcache_aspace (src)); |
| 450 | regcache_cpy (newbuf, src); |
| 451 | return newbuf; |
| 452 | } |
| 453 | |
| 454 | enum register_status |
| 455 | regcache_register_status (const struct regcache *regcache, int regnum) |
| 456 | { |
| 457 | gdb_assert (regcache != NULL); |
| 458 | gdb_assert (regnum >= 0); |
| 459 | if (regcache->readonly_p) |
| 460 | gdb_assert (regnum < regcache->descr->nr_cooked_registers); |
| 461 | else |
| 462 | gdb_assert (regnum < regcache->descr->nr_raw_registers); |
| 463 | |
| 464 | return (enum register_status) regcache->register_status[regnum]; |
| 465 | } |
| 466 | |
| 467 | void |
| 468 | regcache_invalidate (struct regcache *regcache, int regnum) |
| 469 | { |
| 470 | gdb_assert (regcache != NULL); |
| 471 | gdb_assert (regnum >= 0); |
| 472 | gdb_assert (!regcache->readonly_p); |
| 473 | gdb_assert (regnum < regcache->descr->nr_raw_registers); |
| 474 | regcache->register_status[regnum] = REG_UNKNOWN; |
| 475 | } |
| 476 | |
| 477 | |
| 478 | /* Global structure containing the current regcache. */ |
| 479 | |
| 480 | /* NOTE: this is a write-through cache. There is no "dirty" bit for |
| 481 | recording if the register values have been changed (eg. by the |
| 482 | user). Therefore all registers must be written back to the |
| 483 | target when appropriate. */ |
| 484 | |
| 485 | struct regcache_list |
| 486 | { |
| 487 | struct regcache *regcache; |
| 488 | struct regcache_list *next; |
| 489 | }; |
| 490 | |
| 491 | static struct regcache_list *current_regcache; |
| 492 | |
| 493 | struct regcache * |
| 494 | get_thread_arch_aspace_regcache (ptid_t ptid, struct gdbarch *gdbarch, |
| 495 | struct address_space *aspace) |
| 496 | { |
| 497 | struct regcache_list *list; |
| 498 | struct regcache *new_regcache; |
| 499 | |
| 500 | for (list = current_regcache; list; list = list->next) |
| 501 | if (ptid_equal (list->regcache->ptid, ptid) |
| 502 | && get_regcache_arch (list->regcache) == gdbarch) |
| 503 | return list->regcache; |
| 504 | |
| 505 | new_regcache = regcache_xmalloc_1 (gdbarch, aspace, 0); |
| 506 | new_regcache->ptid = ptid; |
| 507 | |
| 508 | list = XNEW (struct regcache_list); |
| 509 | list->regcache = new_regcache; |
| 510 | list->next = current_regcache; |
| 511 | current_regcache = list; |
| 512 | |
| 513 | return new_regcache; |
| 514 | } |
| 515 | |
| 516 | struct regcache * |
| 517 | get_thread_arch_regcache (ptid_t ptid, struct gdbarch *gdbarch) |
| 518 | { |
| 519 | struct address_space *aspace; |
| 520 | |
| 521 | /* For the benefit of "maint print registers" & co when debugging an |
| 522 | executable, allow dumping the regcache even when there is no |
| 523 | thread selected (target_thread_address_space internal-errors if |
| 524 | no address space is found). Note that normal user commands will |
| 525 | fail higher up on the call stack due to no |
| 526 | target_has_registers. */ |
| 527 | aspace = (ptid_equal (null_ptid, ptid) |
| 528 | ? NULL |
| 529 | : target_thread_address_space (ptid)); |
| 530 | |
| 531 | return get_thread_arch_aspace_regcache (ptid, gdbarch, aspace); |
| 532 | } |
| 533 | |
| 534 | static ptid_t current_thread_ptid; |
| 535 | static struct gdbarch *current_thread_arch; |
| 536 | |
| 537 | struct regcache * |
| 538 | get_thread_regcache (ptid_t ptid) |
| 539 | { |
| 540 | if (!current_thread_arch || !ptid_equal (current_thread_ptid, ptid)) |
| 541 | { |
| 542 | current_thread_ptid = ptid; |
| 543 | current_thread_arch = target_thread_architecture (ptid); |
| 544 | } |
| 545 | |
| 546 | return get_thread_arch_regcache (ptid, current_thread_arch); |
| 547 | } |
| 548 | |
| 549 | struct regcache * |
| 550 | get_current_regcache (void) |
| 551 | { |
| 552 | return get_thread_regcache (inferior_ptid); |
| 553 | } |
| 554 | |
| 555 | /* See common/common-regcache.h. */ |
| 556 | |
| 557 | struct regcache * |
| 558 | get_thread_regcache_for_ptid (ptid_t ptid) |
| 559 | { |
| 560 | return get_thread_regcache (ptid); |
| 561 | } |
| 562 | |
| 563 | /* Observer for the target_changed event. */ |
| 564 | |
| 565 | static void |
| 566 | regcache_observer_target_changed (struct target_ops *target) |
| 567 | { |
| 568 | registers_changed (); |
| 569 | } |
| 570 | |
| 571 | /* Update global variables old ptids to hold NEW_PTID if they were |
| 572 | holding OLD_PTID. */ |
| 573 | static void |
| 574 | regcache_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) |
| 575 | { |
| 576 | struct regcache_list *list; |
| 577 | |
| 578 | for (list = current_regcache; list; list = list->next) |
| 579 | if (ptid_equal (list->regcache->ptid, old_ptid)) |
| 580 | list->regcache->ptid = new_ptid; |
| 581 | } |
| 582 | |
| 583 | /* Low level examining and depositing of registers. |
| 584 | |
| 585 | The caller is responsible for making sure that the inferior is |
| 586 | stopped before calling the fetching routines, or it will get |
| 587 | garbage. (a change from GDB version 3, in which the caller got the |
| 588 | value from the last stop). */ |
| 589 | |
| 590 | /* REGISTERS_CHANGED () |
| 591 | |
| 592 | Indicate that registers may have changed, so invalidate the cache. */ |
| 593 | |
| 594 | void |
| 595 | registers_changed_ptid (ptid_t ptid) |
| 596 | { |
| 597 | struct regcache_list *list, **list_link; |
| 598 | |
| 599 | list = current_regcache; |
| 600 | list_link = ¤t_regcache; |
| 601 | while (list) |
| 602 | { |
| 603 | if (ptid_match (list->regcache->ptid, ptid)) |
| 604 | { |
| 605 | struct regcache_list *dead = list; |
| 606 | |
| 607 | *list_link = list->next; |
| 608 | regcache_xfree (list->regcache); |
| 609 | list = *list_link; |
| 610 | xfree (dead); |
| 611 | continue; |
| 612 | } |
| 613 | |
| 614 | list_link = &list->next; |
| 615 | list = *list_link; |
| 616 | } |
| 617 | |
| 618 | if (ptid_match (current_thread_ptid, ptid)) |
| 619 | { |
| 620 | current_thread_ptid = null_ptid; |
| 621 | current_thread_arch = NULL; |
| 622 | } |
| 623 | |
| 624 | if (ptid_match (inferior_ptid, ptid)) |
| 625 | { |
| 626 | /* We just deleted the regcache of the current thread. Need to |
| 627 | forget about any frames we have cached, too. */ |
| 628 | reinit_frame_cache (); |
| 629 | } |
| 630 | } |
| 631 | |
| 632 | void |
| 633 | registers_changed (void) |
| 634 | { |
| 635 | registers_changed_ptid (minus_one_ptid); |
| 636 | |
| 637 | /* Force cleanup of any alloca areas if using C alloca instead of |
| 638 | a builtin alloca. This particular call is used to clean up |
| 639 | areas allocated by low level target code which may build up |
| 640 | during lengthy interactions between gdb and the target before |
| 641 | gdb gives control to the user (ie watchpoints). */ |
| 642 | alloca (0); |
| 643 | } |
| 644 | |
| 645 | enum register_status |
| 646 | regcache_raw_read (struct regcache *regcache, int regnum, gdb_byte *buf) |
| 647 | { |
| 648 | gdb_assert (regcache != NULL && buf != NULL); |
| 649 | gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers); |
| 650 | /* Make certain that the register cache is up-to-date with respect |
| 651 | to the current thread. This switching shouldn't be necessary |
| 652 | only there is still only one target side register cache. Sigh! |
| 653 | On the bright side, at least there is a regcache object. */ |
| 654 | if (!regcache->readonly_p |
| 655 | && regcache_register_status (regcache, regnum) == REG_UNKNOWN) |
| 656 | { |
| 657 | struct cleanup *old_chain = save_inferior_ptid (); |
| 658 | |
| 659 | inferior_ptid = regcache->ptid; |
| 660 | target_fetch_registers (regcache, regnum); |
| 661 | do_cleanups (old_chain); |
| 662 | |
| 663 | /* A number of targets can't access the whole set of raw |
| 664 | registers (because the debug API provides no means to get at |
| 665 | them). */ |
| 666 | if (regcache->register_status[regnum] == REG_UNKNOWN) |
| 667 | regcache->register_status[regnum] = REG_UNAVAILABLE; |
| 668 | } |
| 669 | |
| 670 | if (regcache->register_status[regnum] != REG_VALID) |
| 671 | memset (buf, 0, regcache->descr->sizeof_register[regnum]); |
| 672 | else |
| 673 | memcpy (buf, register_buffer (regcache, regnum), |
| 674 | regcache->descr->sizeof_register[regnum]); |
| 675 | |
| 676 | return (enum register_status) regcache->register_status[regnum]; |
| 677 | } |
| 678 | |
| 679 | enum register_status |
| 680 | regcache_raw_read_signed (struct regcache *regcache, int regnum, LONGEST *val) |
| 681 | { |
| 682 | gdb_byte *buf; |
| 683 | enum register_status status; |
| 684 | |
| 685 | gdb_assert (regcache != NULL); |
| 686 | gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers); |
| 687 | buf = (gdb_byte *) alloca (regcache->descr->sizeof_register[regnum]); |
| 688 | status = regcache_raw_read (regcache, regnum, buf); |
| 689 | if (status == REG_VALID) |
| 690 | *val = extract_signed_integer |
| 691 | (buf, regcache->descr->sizeof_register[regnum], |
| 692 | gdbarch_byte_order (regcache->descr->gdbarch)); |
| 693 | else |
| 694 | *val = 0; |
| 695 | return status; |
| 696 | } |
| 697 | |
| 698 | enum register_status |
| 699 | regcache_raw_read_unsigned (struct regcache *regcache, int regnum, |
| 700 | ULONGEST *val) |
| 701 | { |
| 702 | gdb_byte *buf; |
| 703 | enum register_status status; |
| 704 | |
| 705 | gdb_assert (regcache != NULL); |
| 706 | gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers); |
| 707 | buf = (gdb_byte *) alloca (regcache->descr->sizeof_register[regnum]); |
| 708 | status = regcache_raw_read (regcache, regnum, buf); |
| 709 | if (status == REG_VALID) |
| 710 | *val = extract_unsigned_integer |
| 711 | (buf, regcache->descr->sizeof_register[regnum], |
| 712 | gdbarch_byte_order (regcache->descr->gdbarch)); |
| 713 | else |
| 714 | *val = 0; |
| 715 | return status; |
| 716 | } |
| 717 | |
| 718 | void |
| 719 | regcache_raw_write_signed (struct regcache *regcache, int regnum, LONGEST val) |
| 720 | { |
| 721 | gdb_byte *buf; |
| 722 | |
| 723 | gdb_assert (regcache != NULL); |
| 724 | gdb_assert (regnum >=0 && regnum < regcache->descr->nr_raw_registers); |
| 725 | buf = (gdb_byte *) alloca (regcache->descr->sizeof_register[regnum]); |
| 726 | store_signed_integer (buf, regcache->descr->sizeof_register[regnum], |
| 727 | gdbarch_byte_order (regcache->descr->gdbarch), val); |
| 728 | regcache_raw_write (regcache, regnum, buf); |
| 729 | } |
| 730 | |
| 731 | void |
| 732 | regcache_raw_write_unsigned (struct regcache *regcache, int regnum, |
| 733 | ULONGEST val) |
| 734 | { |
| 735 | gdb_byte *buf; |
| 736 | |
| 737 | gdb_assert (regcache != NULL); |
| 738 | gdb_assert (regnum >=0 && regnum < regcache->descr->nr_raw_registers); |
| 739 | buf = (gdb_byte *) alloca (regcache->descr->sizeof_register[regnum]); |
| 740 | store_unsigned_integer (buf, regcache->descr->sizeof_register[regnum], |
| 741 | gdbarch_byte_order (regcache->descr->gdbarch), val); |
| 742 | regcache_raw_write (regcache, regnum, buf); |
| 743 | } |
| 744 | |
| 745 | enum register_status |
| 746 | regcache_cooked_read (struct regcache *regcache, int regnum, gdb_byte *buf) |
| 747 | { |
| 748 | gdb_assert (regnum >= 0); |
| 749 | gdb_assert (regnum < regcache->descr->nr_cooked_registers); |
| 750 | if (regnum < regcache->descr->nr_raw_registers) |
| 751 | return regcache_raw_read (regcache, regnum, buf); |
| 752 | else if (regcache->readonly_p |
| 753 | && regcache->register_status[regnum] != REG_UNKNOWN) |
| 754 | { |
| 755 | /* Read-only register cache, perhaps the cooked value was |
| 756 | cached? */ |
| 757 | if (regcache->register_status[regnum] == REG_VALID) |
| 758 | memcpy (buf, register_buffer (regcache, regnum), |
| 759 | regcache->descr->sizeof_register[regnum]); |
| 760 | else |
| 761 | memset (buf, 0, regcache->descr->sizeof_register[regnum]); |
| 762 | |
| 763 | return (enum register_status) regcache->register_status[regnum]; |
| 764 | } |
| 765 | else if (gdbarch_pseudo_register_read_value_p (regcache->descr->gdbarch)) |
| 766 | { |
| 767 | struct value *mark, *computed; |
| 768 | enum register_status result = REG_VALID; |
| 769 | |
| 770 | mark = value_mark (); |
| 771 | |
| 772 | computed = gdbarch_pseudo_register_read_value (regcache->descr->gdbarch, |
| 773 | regcache, regnum); |
| 774 | if (value_entirely_available (computed)) |
| 775 | memcpy (buf, value_contents_raw (computed), |
| 776 | regcache->descr->sizeof_register[regnum]); |
| 777 | else |
| 778 | { |
| 779 | memset (buf, 0, regcache->descr->sizeof_register[regnum]); |
| 780 | result = REG_UNAVAILABLE; |
| 781 | } |
| 782 | |
| 783 | value_free_to_mark (mark); |
| 784 | |
| 785 | return result; |
| 786 | } |
| 787 | else |
| 788 | return gdbarch_pseudo_register_read (regcache->descr->gdbarch, regcache, |
| 789 | regnum, buf); |
| 790 | } |
| 791 | |
| 792 | struct value * |
| 793 | regcache_cooked_read_value (struct regcache *regcache, int regnum) |
| 794 | { |
| 795 | gdb_assert (regnum >= 0); |
| 796 | gdb_assert (regnum < regcache->descr->nr_cooked_registers); |
| 797 | |
| 798 | if (regnum < regcache->descr->nr_raw_registers |
| 799 | || (regcache->readonly_p |
| 800 | && regcache->register_status[regnum] != REG_UNKNOWN) |
| 801 | || !gdbarch_pseudo_register_read_value_p (regcache->descr->gdbarch)) |
| 802 | { |
| 803 | struct value *result; |
| 804 | |
| 805 | result = allocate_value (register_type (regcache->descr->gdbarch, |
| 806 | regnum)); |
| 807 | VALUE_LVAL (result) = lval_register; |
| 808 | VALUE_REGNUM (result) = regnum; |
| 809 | |
| 810 | /* It is more efficient in general to do this delegation in this |
| 811 | direction than in the other one, even though the value-based |
| 812 | API is preferred. */ |
| 813 | if (regcache_cooked_read (regcache, regnum, |
| 814 | value_contents_raw (result)) == REG_UNAVAILABLE) |
| 815 | mark_value_bytes_unavailable (result, 0, |
| 816 | TYPE_LENGTH (value_type (result))); |
| 817 | |
| 818 | return result; |
| 819 | } |
| 820 | else |
| 821 | return gdbarch_pseudo_register_read_value (regcache->descr->gdbarch, |
| 822 | regcache, regnum); |
| 823 | } |
| 824 | |
| 825 | enum register_status |
| 826 | regcache_cooked_read_signed (struct regcache *regcache, int regnum, |
| 827 | LONGEST *val) |
| 828 | { |
| 829 | enum register_status status; |
| 830 | gdb_byte *buf; |
| 831 | |
| 832 | gdb_assert (regcache != NULL); |
| 833 | gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_cooked_registers); |
| 834 | buf = (gdb_byte *) alloca (regcache->descr->sizeof_register[regnum]); |
| 835 | status = regcache_cooked_read (regcache, regnum, buf); |
| 836 | if (status == REG_VALID) |
| 837 | *val = extract_signed_integer |
| 838 | (buf, regcache->descr->sizeof_register[regnum], |
| 839 | gdbarch_byte_order (regcache->descr->gdbarch)); |
| 840 | else |
| 841 | *val = 0; |
| 842 | return status; |
| 843 | } |
| 844 | |
| 845 | enum register_status |
| 846 | regcache_cooked_read_unsigned (struct regcache *regcache, int regnum, |
| 847 | ULONGEST *val) |
| 848 | { |
| 849 | enum register_status status; |
| 850 | gdb_byte *buf; |
| 851 | |
| 852 | gdb_assert (regcache != NULL); |
| 853 | gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_cooked_registers); |
| 854 | buf = (gdb_byte *) alloca (regcache->descr->sizeof_register[regnum]); |
| 855 | status = regcache_cooked_read (regcache, regnum, buf); |
| 856 | if (status == REG_VALID) |
| 857 | *val = extract_unsigned_integer |
| 858 | (buf, regcache->descr->sizeof_register[regnum], |
| 859 | gdbarch_byte_order (regcache->descr->gdbarch)); |
| 860 | else |
| 861 | *val = 0; |
| 862 | return status; |
| 863 | } |
| 864 | |
| 865 | void |
| 866 | regcache_cooked_write_signed (struct regcache *regcache, int regnum, |
| 867 | LONGEST val) |
| 868 | { |
| 869 | gdb_byte *buf; |
| 870 | |
| 871 | gdb_assert (regcache != NULL); |
| 872 | gdb_assert (regnum >=0 && regnum < regcache->descr->nr_cooked_registers); |
| 873 | buf = (gdb_byte *) alloca (regcache->descr->sizeof_register[regnum]); |
| 874 | store_signed_integer (buf, regcache->descr->sizeof_register[regnum], |
| 875 | gdbarch_byte_order (regcache->descr->gdbarch), val); |
| 876 | regcache_cooked_write (regcache, regnum, buf); |
| 877 | } |
| 878 | |
| 879 | void |
| 880 | regcache_cooked_write_unsigned (struct regcache *regcache, int regnum, |
| 881 | ULONGEST val) |
| 882 | { |
| 883 | gdb_byte *buf; |
| 884 | |
| 885 | gdb_assert (regcache != NULL); |
| 886 | gdb_assert (regnum >=0 && regnum < regcache->descr->nr_cooked_registers); |
| 887 | buf = (gdb_byte *) alloca (regcache->descr->sizeof_register[regnum]); |
| 888 | store_unsigned_integer (buf, regcache->descr->sizeof_register[regnum], |
| 889 | gdbarch_byte_order (regcache->descr->gdbarch), val); |
| 890 | regcache_cooked_write (regcache, regnum, buf); |
| 891 | } |
| 892 | |
| 893 | void |
| 894 | regcache_raw_write (struct regcache *regcache, int regnum, |
| 895 | const gdb_byte *buf) |
| 896 | { |
| 897 | struct cleanup *chain_before_save_inferior; |
| 898 | struct cleanup *chain_before_invalidate_register; |
| 899 | |
| 900 | gdb_assert (regcache != NULL && buf != NULL); |
| 901 | gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers); |
| 902 | gdb_assert (!regcache->readonly_p); |
| 903 | |
| 904 | /* On the sparc, writing %g0 is a no-op, so we don't even want to |
| 905 | change the registers array if something writes to this register. */ |
| 906 | if (gdbarch_cannot_store_register (get_regcache_arch (regcache), regnum)) |
| 907 | return; |
| 908 | |
| 909 | /* If we have a valid copy of the register, and new value == old |
| 910 | value, then don't bother doing the actual store. */ |
| 911 | if (regcache_register_status (regcache, regnum) == REG_VALID |
| 912 | && (memcmp (register_buffer (regcache, regnum), buf, |
| 913 | regcache->descr->sizeof_register[regnum]) == 0)) |
| 914 | return; |
| 915 | |
| 916 | chain_before_save_inferior = save_inferior_ptid (); |
| 917 | inferior_ptid = regcache->ptid; |
| 918 | |
| 919 | target_prepare_to_store (regcache); |
| 920 | memcpy (register_buffer (regcache, regnum), buf, |
| 921 | regcache->descr->sizeof_register[regnum]); |
| 922 | regcache->register_status[regnum] = REG_VALID; |
| 923 | |
| 924 | /* Register a cleanup function for invalidating the register after it is |
| 925 | written, in case of a failure. */ |
| 926 | chain_before_invalidate_register |
| 927 | = make_cleanup_regcache_invalidate (regcache, regnum); |
| 928 | |
| 929 | target_store_registers (regcache, regnum); |
| 930 | |
| 931 | /* The target did not throw an error so we can discard invalidating the |
| 932 | register and restore the cleanup chain to what it was. */ |
| 933 | discard_cleanups (chain_before_invalidate_register); |
| 934 | |
| 935 | do_cleanups (chain_before_save_inferior); |
| 936 | } |
| 937 | |
| 938 | void |
| 939 | regcache_cooked_write (struct regcache *regcache, int regnum, |
| 940 | const gdb_byte *buf) |
| 941 | { |
| 942 | gdb_assert (regnum >= 0); |
| 943 | gdb_assert (regnum < regcache->descr->nr_cooked_registers); |
| 944 | if (regnum < regcache->descr->nr_raw_registers) |
| 945 | regcache_raw_write (regcache, regnum, buf); |
| 946 | else |
| 947 | gdbarch_pseudo_register_write (regcache->descr->gdbarch, regcache, |
| 948 | regnum, buf); |
| 949 | } |
| 950 | |
| 951 | /* Perform a partial register transfer using a read, modify, write |
| 952 | operation. */ |
| 953 | |
| 954 | typedef void (regcache_read_ftype) (struct regcache *regcache, int regnum, |
| 955 | void *buf); |
| 956 | typedef void (regcache_write_ftype) (struct regcache *regcache, int regnum, |
| 957 | const void *buf); |
| 958 | |
| 959 | static enum register_status |
| 960 | regcache_xfer_part (struct regcache *regcache, int regnum, |
| 961 | int offset, int len, void *in, const void *out, |
| 962 | enum register_status (*read) (struct regcache *regcache, |
| 963 | int regnum, |
| 964 | gdb_byte *buf), |
| 965 | void (*write) (struct regcache *regcache, int regnum, |
| 966 | const gdb_byte *buf)) |
| 967 | { |
| 968 | struct regcache_descr *descr = regcache->descr; |
| 969 | gdb_byte reg[MAX_REGISTER_SIZE]; |
| 970 | |
| 971 | gdb_assert (offset >= 0 && offset <= descr->sizeof_register[regnum]); |
| 972 | gdb_assert (len >= 0 && offset + len <= descr->sizeof_register[regnum]); |
| 973 | /* Something to do? */ |
| 974 | if (offset + len == 0) |
| 975 | return REG_VALID; |
| 976 | /* Read (when needed) ... */ |
| 977 | if (in != NULL |
| 978 | || offset > 0 |
| 979 | || offset + len < descr->sizeof_register[regnum]) |
| 980 | { |
| 981 | enum register_status status; |
| 982 | |
| 983 | gdb_assert (read != NULL); |
| 984 | status = read (regcache, regnum, reg); |
| 985 | if (status != REG_VALID) |
| 986 | return status; |
| 987 | } |
| 988 | /* ... modify ... */ |
| 989 | if (in != NULL) |
| 990 | memcpy (in, reg + offset, len); |
| 991 | if (out != NULL) |
| 992 | memcpy (reg + offset, out, len); |
| 993 | /* ... write (when needed). */ |
| 994 | if (out != NULL) |
| 995 | { |
| 996 | gdb_assert (write != NULL); |
| 997 | write (regcache, regnum, reg); |
| 998 | } |
| 999 | |
| 1000 | return REG_VALID; |
| 1001 | } |
| 1002 | |
| 1003 | enum register_status |
| 1004 | regcache_raw_read_part (struct regcache *regcache, int regnum, |
| 1005 | int offset, int len, gdb_byte *buf) |
| 1006 | { |
| 1007 | struct regcache_descr *descr = regcache->descr; |
| 1008 | |
| 1009 | gdb_assert (regnum >= 0 && regnum < descr->nr_raw_registers); |
| 1010 | return regcache_xfer_part (regcache, regnum, offset, len, buf, NULL, |
| 1011 | regcache_raw_read, regcache_raw_write); |
| 1012 | } |
| 1013 | |
| 1014 | void |
| 1015 | regcache_raw_write_part (struct regcache *regcache, int regnum, |
| 1016 | int offset, int len, const gdb_byte *buf) |
| 1017 | { |
| 1018 | struct regcache_descr *descr = regcache->descr; |
| 1019 | |
| 1020 | gdb_assert (regnum >= 0 && regnum < descr->nr_raw_registers); |
| 1021 | regcache_xfer_part (regcache, regnum, offset, len, NULL, buf, |
| 1022 | regcache_raw_read, regcache_raw_write); |
| 1023 | } |
| 1024 | |
| 1025 | enum register_status |
| 1026 | regcache_cooked_read_part (struct regcache *regcache, int regnum, |
| 1027 | int offset, int len, gdb_byte *buf) |
| 1028 | { |
| 1029 | struct regcache_descr *descr = regcache->descr; |
| 1030 | |
| 1031 | gdb_assert (regnum >= 0 && regnum < descr->nr_cooked_registers); |
| 1032 | return regcache_xfer_part (regcache, regnum, offset, len, buf, NULL, |
| 1033 | regcache_cooked_read, regcache_cooked_write); |
| 1034 | } |
| 1035 | |
| 1036 | void |
| 1037 | regcache_cooked_write_part (struct regcache *regcache, int regnum, |
| 1038 | int offset, int len, const gdb_byte *buf) |
| 1039 | { |
| 1040 | struct regcache_descr *descr = regcache->descr; |
| 1041 | |
| 1042 | gdb_assert (regnum >= 0 && regnum < descr->nr_cooked_registers); |
| 1043 | regcache_xfer_part (regcache, regnum, offset, len, NULL, buf, |
| 1044 | regcache_cooked_read, regcache_cooked_write); |
| 1045 | } |
| 1046 | |
| 1047 | /* Supply register REGNUM, whose contents are stored in BUF, to REGCACHE. */ |
| 1048 | |
| 1049 | void |
| 1050 | regcache_raw_supply (struct regcache *regcache, int regnum, const void *buf) |
| 1051 | { |
| 1052 | void *regbuf; |
| 1053 | size_t size; |
| 1054 | |
| 1055 | gdb_assert (regcache != NULL); |
| 1056 | gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers); |
| 1057 | gdb_assert (!regcache->readonly_p); |
| 1058 | |
| 1059 | regbuf = register_buffer (regcache, regnum); |
| 1060 | size = regcache->descr->sizeof_register[regnum]; |
| 1061 | |
| 1062 | if (buf) |
| 1063 | { |
| 1064 | memcpy (regbuf, buf, size); |
| 1065 | regcache->register_status[regnum] = REG_VALID; |
| 1066 | } |
| 1067 | else |
| 1068 | { |
| 1069 | /* This memset not strictly necessary, but better than garbage |
| 1070 | in case the register value manages to escape somewhere (due |
| 1071 | to a bug, no less). */ |
| 1072 | memset (regbuf, 0, size); |
| 1073 | regcache->register_status[regnum] = REG_UNAVAILABLE; |
| 1074 | } |
| 1075 | } |
| 1076 | |
| 1077 | /* Collect register REGNUM from REGCACHE and store its contents in BUF. */ |
| 1078 | |
| 1079 | void |
| 1080 | regcache_raw_collect (const struct regcache *regcache, int regnum, void *buf) |
| 1081 | { |
| 1082 | const void *regbuf; |
| 1083 | size_t size; |
| 1084 | |
| 1085 | gdb_assert (regcache != NULL && buf != NULL); |
| 1086 | gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers); |
| 1087 | |
| 1088 | regbuf = register_buffer (regcache, regnum); |
| 1089 | size = regcache->descr->sizeof_register[regnum]; |
| 1090 | memcpy (buf, regbuf, size); |
| 1091 | } |
| 1092 | |
| 1093 | /* Transfer a single or all registers belonging to a certain register |
| 1094 | set to or from a buffer. This is the main worker function for |
| 1095 | regcache_supply_regset and regcache_collect_regset. */ |
| 1096 | |
| 1097 | static void |
| 1098 | regcache_transfer_regset (const struct regset *regset, |
| 1099 | const struct regcache *regcache, |
| 1100 | struct regcache *out_regcache, |
| 1101 | int regnum, const void *in_buf, |
| 1102 | void *out_buf, size_t size) |
| 1103 | { |
| 1104 | const struct regcache_map_entry *map; |
| 1105 | int offs = 0, count; |
| 1106 | |
| 1107 | for (map = (const struct regcache_map_entry *) regset->regmap; |
| 1108 | (count = map->count) != 0; |
| 1109 | map++) |
| 1110 | { |
| 1111 | int regno = map->regno; |
| 1112 | int slot_size = map->size; |
| 1113 | |
| 1114 | if (slot_size == 0 && regno != REGCACHE_MAP_SKIP) |
| 1115 | slot_size = regcache->descr->sizeof_register[regno]; |
| 1116 | |
| 1117 | if (regno == REGCACHE_MAP_SKIP |
| 1118 | || (regnum != -1 |
| 1119 | && (regnum < regno || regnum >= regno + count))) |
| 1120 | offs += count * slot_size; |
| 1121 | |
| 1122 | else if (regnum == -1) |
| 1123 | for (; count--; regno++, offs += slot_size) |
| 1124 | { |
| 1125 | if (offs + slot_size > size) |
| 1126 | break; |
| 1127 | |
| 1128 | if (out_buf) |
| 1129 | regcache_raw_collect (regcache, regno, |
| 1130 | (gdb_byte *) out_buf + offs); |
| 1131 | else |
| 1132 | regcache_raw_supply (out_regcache, regno, in_buf |
| 1133 | ? (const gdb_byte *) in_buf + offs |
| 1134 | : NULL); |
| 1135 | } |
| 1136 | else |
| 1137 | { |
| 1138 | /* Transfer a single register and return. */ |
| 1139 | offs += (regnum - regno) * slot_size; |
| 1140 | if (offs + slot_size > size) |
| 1141 | return; |
| 1142 | |
| 1143 | if (out_buf) |
| 1144 | regcache_raw_collect (regcache, regnum, |
| 1145 | (gdb_byte *) out_buf + offs); |
| 1146 | else |
| 1147 | regcache_raw_supply (out_regcache, regnum, in_buf |
| 1148 | ? (const gdb_byte *) in_buf + offs |
| 1149 | : NULL); |
| 1150 | return; |
| 1151 | } |
| 1152 | } |
| 1153 | } |
| 1154 | |
| 1155 | /* Supply register REGNUM from BUF to REGCACHE, using the register map |
| 1156 | in REGSET. If REGNUM is -1, do this for all registers in REGSET. |
| 1157 | If BUF is NULL, set the register(s) to "unavailable" status. */ |
| 1158 | |
| 1159 | void |
| 1160 | regcache_supply_regset (const struct regset *regset, |
| 1161 | struct regcache *regcache, |
| 1162 | int regnum, const void *buf, size_t size) |
| 1163 | { |
| 1164 | regcache_transfer_regset (regset, regcache, regcache, regnum, |
| 1165 | buf, NULL, size); |
| 1166 | } |
| 1167 | |
| 1168 | /* Collect register REGNUM from REGCACHE to BUF, using the register |
| 1169 | map in REGSET. If REGNUM is -1, do this for all registers in |
| 1170 | REGSET. */ |
| 1171 | |
| 1172 | void |
| 1173 | regcache_collect_regset (const struct regset *regset, |
| 1174 | const struct regcache *regcache, |
| 1175 | int regnum, void *buf, size_t size) |
| 1176 | { |
| 1177 | regcache_transfer_regset (regset, regcache, NULL, regnum, |
| 1178 | NULL, buf, size); |
| 1179 | } |
| 1180 | |
| 1181 | |
| 1182 | /* Special handling for register PC. */ |
| 1183 | |
| 1184 | CORE_ADDR |
| 1185 | regcache_read_pc (struct regcache *regcache) |
| 1186 | { |
| 1187 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 1188 | |
| 1189 | CORE_ADDR pc_val; |
| 1190 | |
| 1191 | if (gdbarch_read_pc_p (gdbarch)) |
| 1192 | pc_val = gdbarch_read_pc (gdbarch, regcache); |
| 1193 | /* Else use per-frame method on get_current_frame. */ |
| 1194 | else if (gdbarch_pc_regnum (gdbarch) >= 0) |
| 1195 | { |
| 1196 | ULONGEST raw_val; |
| 1197 | |
| 1198 | if (regcache_cooked_read_unsigned (regcache, |
| 1199 | gdbarch_pc_regnum (gdbarch), |
| 1200 | &raw_val) == REG_UNAVAILABLE) |
| 1201 | throw_error (NOT_AVAILABLE_ERROR, _("PC register is not available")); |
| 1202 | |
| 1203 | pc_val = gdbarch_addr_bits_remove (gdbarch, raw_val); |
| 1204 | } |
| 1205 | else |
| 1206 | internal_error (__FILE__, __LINE__, |
| 1207 | _("regcache_read_pc: Unable to find PC")); |
| 1208 | return pc_val; |
| 1209 | } |
| 1210 | |
| 1211 | void |
| 1212 | regcache_write_pc (struct regcache *regcache, CORE_ADDR pc) |
| 1213 | { |
| 1214 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 1215 | |
| 1216 | if (gdbarch_write_pc_p (gdbarch)) |
| 1217 | gdbarch_write_pc (gdbarch, regcache, pc); |
| 1218 | else if (gdbarch_pc_regnum (gdbarch) >= 0) |
| 1219 | regcache_cooked_write_unsigned (regcache, |
| 1220 | gdbarch_pc_regnum (gdbarch), pc); |
| 1221 | else |
| 1222 | internal_error (__FILE__, __LINE__, |
| 1223 | _("regcache_write_pc: Unable to update PC")); |
| 1224 | |
| 1225 | /* Writing the PC (for instance, from "load") invalidates the |
| 1226 | current frame. */ |
| 1227 | reinit_frame_cache (); |
| 1228 | } |
| 1229 | |
| 1230 | |
| 1231 | static void |
| 1232 | reg_flush_command (char *command, int from_tty) |
| 1233 | { |
| 1234 | /* Force-flush the register cache. */ |
| 1235 | registers_changed (); |
| 1236 | if (from_tty) |
| 1237 | printf_filtered (_("Register cache flushed.\n")); |
| 1238 | } |
| 1239 | |
| 1240 | enum regcache_dump_what |
| 1241 | { |
| 1242 | regcache_dump_none, regcache_dump_raw, |
| 1243 | regcache_dump_cooked, regcache_dump_groups, |
| 1244 | regcache_dump_remote |
| 1245 | }; |
| 1246 | |
| 1247 | static void |
| 1248 | regcache_dump (struct regcache *regcache, struct ui_file *file, |
| 1249 | enum regcache_dump_what what_to_dump) |
| 1250 | { |
| 1251 | struct cleanup *cleanups = make_cleanup (null_cleanup, NULL); |
| 1252 | struct gdbarch *gdbarch = regcache->descr->gdbarch; |
| 1253 | int regnum; |
| 1254 | int footnote_nr = 0; |
| 1255 | int footnote_register_size = 0; |
| 1256 | int footnote_register_offset = 0; |
| 1257 | int footnote_register_type_name_null = 0; |
| 1258 | long register_offset = 0; |
| 1259 | gdb_byte buf[MAX_REGISTER_SIZE]; |
| 1260 | |
| 1261 | #if 0 |
| 1262 | fprintf_unfiltered (file, "nr_raw_registers %d\n", |
| 1263 | regcache->descr->nr_raw_registers); |
| 1264 | fprintf_unfiltered (file, "nr_cooked_registers %d\n", |
| 1265 | regcache->descr->nr_cooked_registers); |
| 1266 | fprintf_unfiltered (file, "sizeof_raw_registers %ld\n", |
| 1267 | regcache->descr->sizeof_raw_registers); |
| 1268 | fprintf_unfiltered (file, "sizeof_raw_register_status %ld\n", |
| 1269 | regcache->descr->sizeof_raw_register_status); |
| 1270 | fprintf_unfiltered (file, "gdbarch_num_regs %d\n", |
| 1271 | gdbarch_num_regs (gdbarch)); |
| 1272 | fprintf_unfiltered (file, "gdbarch_num_pseudo_regs %d\n", |
| 1273 | gdbarch_num_pseudo_regs (gdbarch)); |
| 1274 | #endif |
| 1275 | |
| 1276 | gdb_assert (regcache->descr->nr_cooked_registers |
| 1277 | == (gdbarch_num_regs (gdbarch) |
| 1278 | + gdbarch_num_pseudo_regs (gdbarch))); |
| 1279 | |
| 1280 | for (regnum = -1; regnum < regcache->descr->nr_cooked_registers; regnum++) |
| 1281 | { |
| 1282 | /* Name. */ |
| 1283 | if (regnum < 0) |
| 1284 | fprintf_unfiltered (file, " %-10s", "Name"); |
| 1285 | else |
| 1286 | { |
| 1287 | const char *p = gdbarch_register_name (gdbarch, regnum); |
| 1288 | |
| 1289 | if (p == NULL) |
| 1290 | p = ""; |
| 1291 | else if (p[0] == '\0') |
| 1292 | p = "''"; |
| 1293 | fprintf_unfiltered (file, " %-10s", p); |
| 1294 | } |
| 1295 | |
| 1296 | /* Number. */ |
| 1297 | if (regnum < 0) |
| 1298 | fprintf_unfiltered (file, " %4s", "Nr"); |
| 1299 | else |
| 1300 | fprintf_unfiltered (file, " %4d", regnum); |
| 1301 | |
| 1302 | /* Relative number. */ |
| 1303 | if (regnum < 0) |
| 1304 | fprintf_unfiltered (file, " %4s", "Rel"); |
| 1305 | else if (regnum < gdbarch_num_regs (gdbarch)) |
| 1306 | fprintf_unfiltered (file, " %4d", regnum); |
| 1307 | else |
| 1308 | fprintf_unfiltered (file, " %4d", |
| 1309 | (regnum - gdbarch_num_regs (gdbarch))); |
| 1310 | |
| 1311 | /* Offset. */ |
| 1312 | if (regnum < 0) |
| 1313 | fprintf_unfiltered (file, " %6s ", "Offset"); |
| 1314 | else |
| 1315 | { |
| 1316 | fprintf_unfiltered (file, " %6ld", |
| 1317 | regcache->descr->register_offset[regnum]); |
| 1318 | if (register_offset != regcache->descr->register_offset[regnum] |
| 1319 | || (regnum > 0 |
| 1320 | && (regcache->descr->register_offset[regnum] |
| 1321 | != (regcache->descr->register_offset[regnum - 1] |
| 1322 | + regcache->descr->sizeof_register[regnum - 1]))) |
| 1323 | ) |
| 1324 | { |
| 1325 | if (!footnote_register_offset) |
| 1326 | footnote_register_offset = ++footnote_nr; |
| 1327 | fprintf_unfiltered (file, "*%d", footnote_register_offset); |
| 1328 | } |
| 1329 | else |
| 1330 | fprintf_unfiltered (file, " "); |
| 1331 | register_offset = (regcache->descr->register_offset[regnum] |
| 1332 | + regcache->descr->sizeof_register[regnum]); |
| 1333 | } |
| 1334 | |
| 1335 | /* Size. */ |
| 1336 | if (regnum < 0) |
| 1337 | fprintf_unfiltered (file, " %5s ", "Size"); |
| 1338 | else |
| 1339 | fprintf_unfiltered (file, " %5ld", |
| 1340 | regcache->descr->sizeof_register[regnum]); |
| 1341 | |
| 1342 | /* Type. */ |
| 1343 | { |
| 1344 | const char *t; |
| 1345 | |
| 1346 | if (regnum < 0) |
| 1347 | t = "Type"; |
| 1348 | else |
| 1349 | { |
| 1350 | static const char blt[] = "builtin_type"; |
| 1351 | |
| 1352 | t = TYPE_NAME (register_type (regcache->descr->gdbarch, regnum)); |
| 1353 | if (t == NULL) |
| 1354 | { |
| 1355 | char *n; |
| 1356 | |
| 1357 | if (!footnote_register_type_name_null) |
| 1358 | footnote_register_type_name_null = ++footnote_nr; |
| 1359 | n = xstrprintf ("*%d", footnote_register_type_name_null); |
| 1360 | make_cleanup (xfree, n); |
| 1361 | t = n; |
| 1362 | } |
| 1363 | /* Chop a leading builtin_type. */ |
| 1364 | if (startswith (t, blt)) |
| 1365 | t += strlen (blt); |
| 1366 | } |
| 1367 | fprintf_unfiltered (file, " %-15s", t); |
| 1368 | } |
| 1369 | |
| 1370 | /* Leading space always present. */ |
| 1371 | fprintf_unfiltered (file, " "); |
| 1372 | |
| 1373 | /* Value, raw. */ |
| 1374 | if (what_to_dump == regcache_dump_raw) |
| 1375 | { |
| 1376 | if (regnum < 0) |
| 1377 | fprintf_unfiltered (file, "Raw value"); |
| 1378 | else if (regnum >= regcache->descr->nr_raw_registers) |
| 1379 | fprintf_unfiltered (file, "<cooked>"); |
| 1380 | else if (regcache_register_status (regcache, regnum) == REG_UNKNOWN) |
| 1381 | fprintf_unfiltered (file, "<invalid>"); |
| 1382 | else if (regcache_register_status (regcache, regnum) == REG_UNAVAILABLE) |
| 1383 | fprintf_unfiltered (file, "<unavailable>"); |
| 1384 | else |
| 1385 | { |
| 1386 | regcache_raw_read (regcache, regnum, buf); |
| 1387 | print_hex_chars (file, buf, |
| 1388 | regcache->descr->sizeof_register[regnum], |
| 1389 | gdbarch_byte_order (gdbarch)); |
| 1390 | } |
| 1391 | } |
| 1392 | |
| 1393 | /* Value, cooked. */ |
| 1394 | if (what_to_dump == regcache_dump_cooked) |
| 1395 | { |
| 1396 | if (regnum < 0) |
| 1397 | fprintf_unfiltered (file, "Cooked value"); |
| 1398 | else |
| 1399 | { |
| 1400 | enum register_status status; |
| 1401 | |
| 1402 | status = regcache_cooked_read (regcache, regnum, buf); |
| 1403 | if (status == REG_UNKNOWN) |
| 1404 | fprintf_unfiltered (file, "<invalid>"); |
| 1405 | else if (status == REG_UNAVAILABLE) |
| 1406 | fprintf_unfiltered (file, "<unavailable>"); |
| 1407 | else |
| 1408 | print_hex_chars (file, buf, |
| 1409 | regcache->descr->sizeof_register[regnum], |
| 1410 | gdbarch_byte_order (gdbarch)); |
| 1411 | } |
| 1412 | } |
| 1413 | |
| 1414 | /* Group members. */ |
| 1415 | if (what_to_dump == regcache_dump_groups) |
| 1416 | { |
| 1417 | if (regnum < 0) |
| 1418 | fprintf_unfiltered (file, "Groups"); |
| 1419 | else |
| 1420 | { |
| 1421 | const char *sep = ""; |
| 1422 | struct reggroup *group; |
| 1423 | |
| 1424 | for (group = reggroup_next (gdbarch, NULL); |
| 1425 | group != NULL; |
| 1426 | group = reggroup_next (gdbarch, group)) |
| 1427 | { |
| 1428 | if (gdbarch_register_reggroup_p (gdbarch, regnum, group)) |
| 1429 | { |
| 1430 | fprintf_unfiltered (file, |
| 1431 | "%s%s", sep, reggroup_name (group)); |
| 1432 | sep = ","; |
| 1433 | } |
| 1434 | } |
| 1435 | } |
| 1436 | } |
| 1437 | |
| 1438 | /* Remote packet configuration. */ |
| 1439 | if (what_to_dump == regcache_dump_remote) |
| 1440 | { |
| 1441 | if (regnum < 0) |
| 1442 | { |
| 1443 | fprintf_unfiltered (file, "Rmt Nr g/G Offset"); |
| 1444 | } |
| 1445 | else if (regnum < regcache->descr->nr_raw_registers) |
| 1446 | { |
| 1447 | int pnum, poffset; |
| 1448 | |
| 1449 | if (remote_register_number_and_offset (get_regcache_arch (regcache), regnum, |
| 1450 | &pnum, &poffset)) |
| 1451 | fprintf_unfiltered (file, "%7d %11d", pnum, poffset); |
| 1452 | } |
| 1453 | } |
| 1454 | |
| 1455 | fprintf_unfiltered (file, "\n"); |
| 1456 | } |
| 1457 | |
| 1458 | if (footnote_register_size) |
| 1459 | fprintf_unfiltered (file, "*%d: Inconsistent register sizes.\n", |
| 1460 | footnote_register_size); |
| 1461 | if (footnote_register_offset) |
| 1462 | fprintf_unfiltered (file, "*%d: Inconsistent register offsets.\n", |
| 1463 | footnote_register_offset); |
| 1464 | if (footnote_register_type_name_null) |
| 1465 | fprintf_unfiltered (file, |
| 1466 | "*%d: Register type's name NULL.\n", |
| 1467 | footnote_register_type_name_null); |
| 1468 | do_cleanups (cleanups); |
| 1469 | } |
| 1470 | |
| 1471 | static void |
| 1472 | regcache_print (char *args, enum regcache_dump_what what_to_dump) |
| 1473 | { |
| 1474 | if (args == NULL) |
| 1475 | regcache_dump (get_current_regcache (), gdb_stdout, what_to_dump); |
| 1476 | else |
| 1477 | { |
| 1478 | struct cleanup *cleanups; |
| 1479 | struct ui_file *file = gdb_fopen (args, "w"); |
| 1480 | |
| 1481 | if (file == NULL) |
| 1482 | perror_with_name (_("maintenance print architecture")); |
| 1483 | cleanups = make_cleanup_ui_file_delete (file); |
| 1484 | regcache_dump (get_current_regcache (), file, what_to_dump); |
| 1485 | do_cleanups (cleanups); |
| 1486 | } |
| 1487 | } |
| 1488 | |
| 1489 | static void |
| 1490 | maintenance_print_registers (char *args, int from_tty) |
| 1491 | { |
| 1492 | regcache_print (args, regcache_dump_none); |
| 1493 | } |
| 1494 | |
| 1495 | static void |
| 1496 | maintenance_print_raw_registers (char *args, int from_tty) |
| 1497 | { |
| 1498 | regcache_print (args, regcache_dump_raw); |
| 1499 | } |
| 1500 | |
| 1501 | static void |
| 1502 | maintenance_print_cooked_registers (char *args, int from_tty) |
| 1503 | { |
| 1504 | regcache_print (args, regcache_dump_cooked); |
| 1505 | } |
| 1506 | |
| 1507 | static void |
| 1508 | maintenance_print_register_groups (char *args, int from_tty) |
| 1509 | { |
| 1510 | regcache_print (args, regcache_dump_groups); |
| 1511 | } |
| 1512 | |
| 1513 | static void |
| 1514 | maintenance_print_remote_registers (char *args, int from_tty) |
| 1515 | { |
| 1516 | regcache_print (args, regcache_dump_remote); |
| 1517 | } |
| 1518 | |
| 1519 | extern initialize_file_ftype _initialize_regcache; /* -Wmissing-prototype */ |
| 1520 | |
| 1521 | void |
| 1522 | _initialize_regcache (void) |
| 1523 | { |
| 1524 | regcache_descr_handle |
| 1525 | = gdbarch_data_register_post_init (init_regcache_descr); |
| 1526 | |
| 1527 | observer_attach_target_changed (regcache_observer_target_changed); |
| 1528 | observer_attach_thread_ptid_changed (regcache_thread_ptid_changed); |
| 1529 | |
| 1530 | add_com ("flushregs", class_maintenance, reg_flush_command, |
| 1531 | _("Force gdb to flush its register cache (maintainer command)")); |
| 1532 | |
| 1533 | add_cmd ("registers", class_maintenance, maintenance_print_registers, |
| 1534 | _("Print the internal register configuration.\n" |
| 1535 | "Takes an optional file parameter."), &maintenanceprintlist); |
| 1536 | add_cmd ("raw-registers", class_maintenance, |
| 1537 | maintenance_print_raw_registers, |
| 1538 | _("Print the internal register configuration " |
| 1539 | "including raw values.\n" |
| 1540 | "Takes an optional file parameter."), &maintenanceprintlist); |
| 1541 | add_cmd ("cooked-registers", class_maintenance, |
| 1542 | maintenance_print_cooked_registers, |
| 1543 | _("Print the internal register configuration " |
| 1544 | "including cooked values.\n" |
| 1545 | "Takes an optional file parameter."), &maintenanceprintlist); |
| 1546 | add_cmd ("register-groups", class_maintenance, |
| 1547 | maintenance_print_register_groups, |
| 1548 | _("Print the internal register configuration " |
| 1549 | "including each register's group.\n" |
| 1550 | "Takes an optional file parameter."), |
| 1551 | &maintenanceprintlist); |
| 1552 | add_cmd ("remote-registers", class_maintenance, |
| 1553 | maintenance_print_remote_registers, _("\ |
| 1554 | Print the internal register configuration including each register's\n\ |
| 1555 | remote register number and buffer offset in the g/G packets.\n\ |
| 1556 | Takes an optional file parameter."), |
| 1557 | &maintenanceprintlist); |
| 1558 | |
| 1559 | } |