| 1 | /* Target description support for GDB. |
| 2 | |
| 3 | Copyright (C) 2006, 2007 Free Software Foundation, Inc. |
| 4 | |
| 5 | Contributed by CodeSourcery. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 2 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program; if not, write to the Free Software |
| 21 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 22 | Boston, MA 02110-1301, USA. */ |
| 23 | |
| 24 | #include "defs.h" |
| 25 | #include "arch-utils.h" |
| 26 | #include "gdbcmd.h" |
| 27 | #include "gdbtypes.h" |
| 28 | #include "reggroups.h" |
| 29 | #include "target.h" |
| 30 | #include "target-descriptions.h" |
| 31 | #include "vec.h" |
| 32 | #include "xml-support.h" |
| 33 | #include "xml-tdesc.h" |
| 34 | |
| 35 | #include "gdb_assert.h" |
| 36 | #include "gdb_obstack.h" |
| 37 | #include "hashtab.h" |
| 38 | |
| 39 | /* Types. */ |
| 40 | |
| 41 | typedef struct property |
| 42 | { |
| 43 | char *key; |
| 44 | char *value; |
| 45 | } property_s; |
| 46 | DEF_VEC_O(property_s); |
| 47 | |
| 48 | /* An individual register from a target description. */ |
| 49 | |
| 50 | typedef struct tdesc_reg |
| 51 | { |
| 52 | /* The name of this register. In standard features, it may be |
| 53 | recognized by the architecture support code, or it may be purely |
| 54 | for the user. */ |
| 55 | char *name; |
| 56 | |
| 57 | /* The register number used by this target to refer to this |
| 58 | register. This is used for remote p/P packets and to determine |
| 59 | the ordering of registers in the remote g/G packets. */ |
| 60 | long target_regnum; |
| 61 | |
| 62 | /* If this flag is set, GDB should save and restore this register |
| 63 | around calls to an inferior function. */ |
| 64 | int save_restore; |
| 65 | |
| 66 | /* The name of the register group containing this register, or NULL |
| 67 | if the group should be automatically determined from the |
| 68 | register's type. If this is "general", "float", or "vector", the |
| 69 | corresponding "info" command should display this register's |
| 70 | value. It can be an arbitrary string, but should be limited to |
| 71 | alphanumeric characters and internal hyphens. Currently other |
| 72 | strings are ignored (treated as NULL). */ |
| 73 | char *group; |
| 74 | |
| 75 | /* The size of the register, in bits. */ |
| 76 | int bitsize; |
| 77 | |
| 78 | /* The type of the register. This string corresponds to either |
| 79 | a named type from the target description or a predefined |
| 80 | type from GDB. */ |
| 81 | char *type; |
| 82 | |
| 83 | /* The target-described type corresponding to TYPE, if found. */ |
| 84 | struct type *gdb_type; |
| 85 | } *tdesc_reg_p; |
| 86 | DEF_VEC_P(tdesc_reg_p); |
| 87 | |
| 88 | /* A named type from a target description. */ |
| 89 | typedef struct type *type_p; |
| 90 | DEF_VEC_P(type_p); |
| 91 | |
| 92 | /* A feature from a target description. Each feature is a collection |
| 93 | of other elements, e.g. registers and types. */ |
| 94 | |
| 95 | typedef struct tdesc_feature |
| 96 | { |
| 97 | /* The name of this feature. It may be recognized by the architecture |
| 98 | support code. */ |
| 99 | char *name; |
| 100 | |
| 101 | /* The registers associated with this feature. */ |
| 102 | VEC(tdesc_reg_p) *registers; |
| 103 | |
| 104 | /* The types associated with this feature. */ |
| 105 | VEC(type_p) *types; |
| 106 | } *tdesc_feature_p; |
| 107 | DEF_VEC_P(tdesc_feature_p); |
| 108 | |
| 109 | /* A target description. */ |
| 110 | |
| 111 | struct target_desc |
| 112 | { |
| 113 | /* The architecture reported by the target, if any. */ |
| 114 | const struct bfd_arch_info *arch; |
| 115 | |
| 116 | /* Any architecture-specific properties specified by the target. */ |
| 117 | VEC(property_s) *properties; |
| 118 | |
| 119 | /* The features associated with this target. */ |
| 120 | VEC(tdesc_feature_p) *features; |
| 121 | }; |
| 122 | |
| 123 | /* Per-architecture data associated with a target description. The |
| 124 | target description may be shared by multiple architectures, but |
| 125 | this data is private to one gdbarch. */ |
| 126 | |
| 127 | struct tdesc_arch_data |
| 128 | { |
| 129 | /* A list of registers, indexed by GDB's internal register number. |
| 130 | During initialization of the gdbarch this list is used to store |
| 131 | registers which the architecture assigns a fixed register number. |
| 132 | Registers which are NULL in this array, or off the end, are |
| 133 | treated as zero-sized and nameless (i.e. placeholders in the |
| 134 | numbering). */ |
| 135 | VEC(tdesc_reg_p) *registers; |
| 136 | |
| 137 | /* Functions which report the register name, type, and reggroups for |
| 138 | pseudo-registers. */ |
| 139 | gdbarch_register_name_ftype *pseudo_register_name; |
| 140 | gdbarch_register_type_ftype *pseudo_register_type; |
| 141 | gdbarch_register_reggroup_p_ftype *pseudo_register_reggroup_p; |
| 142 | }; |
| 143 | |
| 144 | /* Global state. These variables are associated with the current |
| 145 | target; if GDB adds support for multiple simultaneous targets, then |
| 146 | these variables should become target-specific data. */ |
| 147 | |
| 148 | /* A flag indicating that a description has already been fetched from |
| 149 | the current target, so it should not be queried again. */ |
| 150 | |
| 151 | static int target_desc_fetched; |
| 152 | |
| 153 | /* The description fetched from the current target, or NULL if the |
| 154 | current target did not supply any description. Only valid when |
| 155 | target_desc_fetched is set. Only the description initialization |
| 156 | code should access this; normally, the description should be |
| 157 | accessed through the gdbarch object. */ |
| 158 | |
| 159 | static const struct target_desc *current_target_desc; |
| 160 | |
| 161 | /* Other global variables. */ |
| 162 | |
| 163 | /* The filename to read a target description from. */ |
| 164 | |
| 165 | static char *target_description_filename; |
| 166 | |
| 167 | /* A handle for architecture-specific data associated with the |
| 168 | target description (see struct tdesc_arch_data). */ |
| 169 | |
| 170 | static struct gdbarch_data *tdesc_data; |
| 171 | |
| 172 | /* Fetch the current target's description, and switch the current |
| 173 | architecture to one which incorporates that description. */ |
| 174 | |
| 175 | void |
| 176 | target_find_description (void) |
| 177 | { |
| 178 | /* If we've already fetched a description from the target, don't do |
| 179 | it again. This allows a target to fetch the description early, |
| 180 | during its to_open or to_create_inferior, if it needs extra |
| 181 | information about the target to initialize. */ |
| 182 | if (target_desc_fetched) |
| 183 | return; |
| 184 | |
| 185 | /* The current architecture should not have any target description |
| 186 | specified. It should have been cleared, e.g. when we |
| 187 | disconnected from the previous target. */ |
| 188 | gdb_assert (gdbarch_target_desc (current_gdbarch) == NULL); |
| 189 | |
| 190 | /* First try to fetch an XML description from the user-specified |
| 191 | file. */ |
| 192 | current_target_desc = NULL; |
| 193 | if (target_description_filename != NULL |
| 194 | && *target_description_filename != '\0') |
| 195 | current_target_desc |
| 196 | = file_read_description_xml (target_description_filename); |
| 197 | |
| 198 | /* Next try to read the description from the current target using |
| 199 | target objects. */ |
| 200 | if (current_target_desc == NULL) |
| 201 | current_target_desc = target_read_description_xml (¤t_target); |
| 202 | |
| 203 | /* If that failed try a target-specific hook. */ |
| 204 | if (current_target_desc == NULL) |
| 205 | current_target_desc = target_read_description (¤t_target); |
| 206 | |
| 207 | /* If a non-NULL description was returned, then update the current |
| 208 | architecture. */ |
| 209 | if (current_target_desc) |
| 210 | { |
| 211 | struct gdbarch_info info; |
| 212 | |
| 213 | gdbarch_info_init (&info); |
| 214 | info.target_desc = current_target_desc; |
| 215 | if (!gdbarch_update_p (info)) |
| 216 | warning (_("Architecture rejected target-supplied description")); |
| 217 | else |
| 218 | { |
| 219 | struct tdesc_arch_data *data; |
| 220 | |
| 221 | data = gdbarch_data (current_gdbarch, tdesc_data); |
| 222 | if (tdesc_has_registers (current_target_desc) |
| 223 | && data->registers == NULL) |
| 224 | warning (_("Target-supplied registers are not supported " |
| 225 | "by the current architecture")); |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | /* Now that we know this description is usable, record that we |
| 230 | fetched it. */ |
| 231 | target_desc_fetched = 1; |
| 232 | } |
| 233 | |
| 234 | /* Discard any description fetched from the current target, and switch |
| 235 | the current architecture to one with no target description. */ |
| 236 | |
| 237 | void |
| 238 | target_clear_description (void) |
| 239 | { |
| 240 | struct gdbarch_info info; |
| 241 | |
| 242 | if (!target_desc_fetched) |
| 243 | return; |
| 244 | |
| 245 | target_desc_fetched = 0; |
| 246 | current_target_desc = NULL; |
| 247 | |
| 248 | gdbarch_info_init (&info); |
| 249 | if (!gdbarch_update_p (info)) |
| 250 | internal_error (__FILE__, __LINE__, |
| 251 | _("Could not remove target-supplied description")); |
| 252 | } |
| 253 | |
| 254 | /* Return the global current target description. This should only be |
| 255 | used by gdbarch initialization code; most access should be through |
| 256 | an existing gdbarch. */ |
| 257 | |
| 258 | const struct target_desc * |
| 259 | target_current_description (void) |
| 260 | { |
| 261 | if (target_desc_fetched) |
| 262 | return current_target_desc; |
| 263 | |
| 264 | return NULL; |
| 265 | } |
| 266 | \f |
| 267 | |
| 268 | /* Direct accessors for target descriptions. */ |
| 269 | |
| 270 | /* Return the string value of a property named KEY, or NULL if the |
| 271 | property was not specified. */ |
| 272 | |
| 273 | const char * |
| 274 | tdesc_property (const struct target_desc *target_desc, const char *key) |
| 275 | { |
| 276 | struct property *prop; |
| 277 | int ix; |
| 278 | |
| 279 | for (ix = 0; VEC_iterate (property_s, target_desc->properties, ix, prop); |
| 280 | ix++) |
| 281 | if (strcmp (prop->key, key) == 0) |
| 282 | return prop->value; |
| 283 | |
| 284 | return NULL; |
| 285 | } |
| 286 | |
| 287 | /* Return the BFD architecture associated with this target |
| 288 | description, or NULL if no architecture was specified. */ |
| 289 | |
| 290 | const struct bfd_arch_info * |
| 291 | tdesc_architecture (const struct target_desc *target_desc) |
| 292 | { |
| 293 | return target_desc->arch; |
| 294 | } |
| 295 | \f |
| 296 | |
| 297 | /* Return 1 if this target description includes any registers. */ |
| 298 | |
| 299 | int |
| 300 | tdesc_has_registers (const struct target_desc *target_desc) |
| 301 | { |
| 302 | int ix; |
| 303 | struct tdesc_feature *feature; |
| 304 | |
| 305 | if (target_desc == NULL) |
| 306 | return 0; |
| 307 | |
| 308 | for (ix = 0; |
| 309 | VEC_iterate (tdesc_feature_p, target_desc->features, ix, feature); |
| 310 | ix++) |
| 311 | if (! VEC_empty (tdesc_reg_p, feature->registers)) |
| 312 | return 1; |
| 313 | |
| 314 | return 0; |
| 315 | } |
| 316 | |
| 317 | /* Return the feature with the given name, if present, or NULL if |
| 318 | the named feature is not found. */ |
| 319 | |
| 320 | const struct tdesc_feature * |
| 321 | tdesc_find_feature (const struct target_desc *target_desc, |
| 322 | const char *name) |
| 323 | { |
| 324 | int ix; |
| 325 | struct tdesc_feature *feature; |
| 326 | |
| 327 | for (ix = 0; |
| 328 | VEC_iterate (tdesc_feature_p, target_desc->features, ix, feature); |
| 329 | ix++) |
| 330 | if (strcmp (feature->name, name) == 0) |
| 331 | return feature; |
| 332 | |
| 333 | return NULL; |
| 334 | } |
| 335 | |
| 336 | /* Return the name of FEATURE. */ |
| 337 | |
| 338 | const char * |
| 339 | tdesc_feature_name (const struct tdesc_feature *feature) |
| 340 | { |
| 341 | return feature->name; |
| 342 | } |
| 343 | |
| 344 | /* Return the type associated with ID in the context of FEATURE, or |
| 345 | NULL if none. */ |
| 346 | |
| 347 | struct type * |
| 348 | tdesc_named_type (const struct tdesc_feature *feature, const char *id) |
| 349 | { |
| 350 | int ix; |
| 351 | struct type *gdb_type; |
| 352 | |
| 353 | /* First try target-defined types. */ |
| 354 | for (ix = 0; VEC_iterate (type_p, feature->types, ix, gdb_type); ix++) |
| 355 | if (strcmp (TYPE_NAME (gdb_type), id) == 0) |
| 356 | return gdb_type; |
| 357 | |
| 358 | /* Next try some predefined types. Note that none of these types |
| 359 | depend on the current architecture; some of the builtin_type_foo |
| 360 | variables are swapped based on the architecture. */ |
| 361 | if (strcmp (id, "int8") == 0) |
| 362 | return builtin_type_int8; |
| 363 | |
| 364 | if (strcmp (id, "int16") == 0) |
| 365 | return builtin_type_int16; |
| 366 | |
| 367 | if (strcmp (id, "int32") == 0) |
| 368 | return builtin_type_int32; |
| 369 | |
| 370 | if (strcmp (id, "int64") == 0) |
| 371 | return builtin_type_int64; |
| 372 | |
| 373 | if (strcmp (id, "uint8") == 0) |
| 374 | return builtin_type_uint8; |
| 375 | |
| 376 | if (strcmp (id, "uint16") == 0) |
| 377 | return builtin_type_uint16; |
| 378 | |
| 379 | if (strcmp (id, "uint32") == 0) |
| 380 | return builtin_type_uint32; |
| 381 | |
| 382 | if (strcmp (id, "uint64") == 0) |
| 383 | return builtin_type_uint64; |
| 384 | |
| 385 | if (strcmp (id, "ieee_single") == 0) |
| 386 | return builtin_type_ieee_single; |
| 387 | |
| 388 | if (strcmp (id, "ieee_double") == 0) |
| 389 | return builtin_type_ieee_double; |
| 390 | |
| 391 | if (strcmp (id, "arm_fpa_ext") == 0) |
| 392 | return builtin_type_arm_ext; |
| 393 | |
| 394 | return NULL; |
| 395 | } |
| 396 | \f |
| 397 | |
| 398 | /* Support for registers from target descriptions. */ |
| 399 | |
| 400 | /* Construct the per-gdbarch data. */ |
| 401 | |
| 402 | static void * |
| 403 | tdesc_data_init (struct obstack *obstack) |
| 404 | { |
| 405 | struct tdesc_arch_data *data; |
| 406 | |
| 407 | data = OBSTACK_ZALLOC (obstack, struct tdesc_arch_data); |
| 408 | return data; |
| 409 | } |
| 410 | |
| 411 | /* Similar, but for the temporary copy used during architecture |
| 412 | initialization. */ |
| 413 | |
| 414 | struct tdesc_arch_data * |
| 415 | tdesc_data_alloc (void) |
| 416 | { |
| 417 | return XZALLOC (struct tdesc_arch_data); |
| 418 | } |
| 419 | |
| 420 | /* Free something allocated by tdesc_data_alloc, if it is not going |
| 421 | to be used (for instance if it was unsuitable for the |
| 422 | architecture). */ |
| 423 | |
| 424 | void |
| 425 | tdesc_data_cleanup (void *data_untyped) |
| 426 | { |
| 427 | struct tdesc_arch_data *data = data_untyped; |
| 428 | |
| 429 | VEC_free (tdesc_reg_p, data->registers); |
| 430 | xfree (data); |
| 431 | } |
| 432 | |
| 433 | /* Search FEATURE for a register named NAME. */ |
| 434 | |
| 435 | int |
| 436 | tdesc_numbered_register (const struct tdesc_feature *feature, |
| 437 | struct tdesc_arch_data *data, |
| 438 | int regno, const char *name) |
| 439 | { |
| 440 | int ixr; |
| 441 | struct tdesc_reg *reg; |
| 442 | |
| 443 | for (ixr = 0; |
| 444 | VEC_iterate (tdesc_reg_p, feature->registers, ixr, reg); |
| 445 | ixr++) |
| 446 | if (strcasecmp (reg->name, name) == 0) |
| 447 | { |
| 448 | /* Make sure the vector includes a REGNO'th element. */ |
| 449 | while (regno >= VEC_length (tdesc_reg_p, data->registers)) |
| 450 | VEC_safe_push (tdesc_reg_p, data->registers, NULL); |
| 451 | VEC_replace (tdesc_reg_p, data->registers, regno, reg); |
| 452 | return 1; |
| 453 | } |
| 454 | |
| 455 | return 0; |
| 456 | } |
| 457 | |
| 458 | /* Search FEATURE for a register whose name is in NAMES. */ |
| 459 | |
| 460 | int |
| 461 | tdesc_numbered_register_choices (const struct tdesc_feature *feature, |
| 462 | struct tdesc_arch_data *data, |
| 463 | int regno, const char *const names[]) |
| 464 | { |
| 465 | int i; |
| 466 | |
| 467 | for (i = 0; names[i] != NULL; i++) |
| 468 | if (tdesc_numbered_register (feature, data, regno, names[i])) |
| 469 | return 1; |
| 470 | |
| 471 | return 0; |
| 472 | } |
| 473 | |
| 474 | /* Look up a register by its GDB internal register number. */ |
| 475 | |
| 476 | static struct tdesc_reg * |
| 477 | tdesc_find_register (struct gdbarch *gdbarch, int regno) |
| 478 | { |
| 479 | struct tdesc_reg *reg; |
| 480 | struct tdesc_arch_data *data; |
| 481 | |
| 482 | data = gdbarch_data (gdbarch, tdesc_data); |
| 483 | if (regno < VEC_length (tdesc_reg_p, data->registers)) |
| 484 | return VEC_index (tdesc_reg_p, data->registers, regno); |
| 485 | else |
| 486 | return NULL; |
| 487 | } |
| 488 | |
| 489 | /* Return the name of register REGNO, from the target description or |
| 490 | from an architecture-provided pseudo_register_name method. */ |
| 491 | |
| 492 | const char * |
| 493 | tdesc_register_name (int regno) |
| 494 | { |
| 495 | struct tdesc_reg *reg = tdesc_find_register (current_gdbarch, regno); |
| 496 | int num_regs = gdbarch_num_regs (current_gdbarch); |
| 497 | int num_pseudo_regs = gdbarch_num_pseudo_regs (current_gdbarch); |
| 498 | |
| 499 | if (reg != NULL) |
| 500 | return reg->name; |
| 501 | |
| 502 | if (regno >= num_regs && regno < num_regs + num_pseudo_regs) |
| 503 | { |
| 504 | struct tdesc_arch_data *data = gdbarch_data (current_gdbarch, |
| 505 | tdesc_data); |
| 506 | gdb_assert (data->pseudo_register_name != NULL); |
| 507 | return data->pseudo_register_name (regno); |
| 508 | } |
| 509 | |
| 510 | return ""; |
| 511 | } |
| 512 | |
| 513 | static struct type * |
| 514 | tdesc_register_type (struct gdbarch *gdbarch, int regno) |
| 515 | { |
| 516 | struct tdesc_reg *reg = tdesc_find_register (gdbarch, regno); |
| 517 | int num_regs = gdbarch_num_regs (gdbarch); |
| 518 | int num_pseudo_regs = gdbarch_num_pseudo_regs (gdbarch); |
| 519 | |
| 520 | if (reg == NULL && regno >= num_regs && regno < num_regs + num_pseudo_regs) |
| 521 | { |
| 522 | struct tdesc_arch_data *data = gdbarch_data (gdbarch, tdesc_data); |
| 523 | gdb_assert (data->pseudo_register_type != NULL); |
| 524 | return data->pseudo_register_type (gdbarch, regno); |
| 525 | } |
| 526 | |
| 527 | if (reg == NULL) |
| 528 | /* Return "int0_t", since "void" has a misleading size of one. */ |
| 529 | return builtin_type_int0; |
| 530 | |
| 531 | /* First check for a predefined or target defined type. */ |
| 532 | if (reg->gdb_type) |
| 533 | return reg->gdb_type; |
| 534 | |
| 535 | /* Next try size-sensitive type shortcuts. */ |
| 536 | if (strcmp (reg->type, "float") == 0) |
| 537 | { |
| 538 | if (reg->bitsize == gdbarch_float_bit (gdbarch)) |
| 539 | return builtin_type_float; |
| 540 | else if (reg->bitsize == gdbarch_double_bit (gdbarch)) |
| 541 | return builtin_type_double; |
| 542 | else if (reg->bitsize == gdbarch_long_double_bit (gdbarch)) |
| 543 | return builtin_type_long_double; |
| 544 | } |
| 545 | else if (strcmp (reg->type, "int") == 0) |
| 546 | { |
| 547 | if (reg->bitsize == gdbarch_long_bit (gdbarch)) |
| 548 | return builtin_type_long; |
| 549 | else if (reg->bitsize == TARGET_CHAR_BIT) |
| 550 | return builtin_type_char; |
| 551 | else if (reg->bitsize == gdbarch_short_bit (gdbarch)) |
| 552 | return builtin_type_short; |
| 553 | else if (reg->bitsize == gdbarch_int_bit (gdbarch)) |
| 554 | return builtin_type_int; |
| 555 | else if (reg->bitsize == gdbarch_long_long_bit (gdbarch)) |
| 556 | return builtin_type_long_long; |
| 557 | else if (reg->bitsize == gdbarch_ptr_bit (gdbarch)) |
| 558 | /* A bit desperate by this point... */ |
| 559 | return builtin_type_void_data_ptr; |
| 560 | } |
| 561 | else if (strcmp (reg->type, "code_ptr") == 0) |
| 562 | return builtin_type_void_func_ptr; |
| 563 | else if (strcmp (reg->type, "data_ptr") == 0) |
| 564 | return builtin_type_void_data_ptr; |
| 565 | else |
| 566 | internal_error (__FILE__, __LINE__, |
| 567 | "Register \"%s\" has an unknown type \"%s\"", |
| 568 | reg->name, reg->type); |
| 569 | |
| 570 | warning (_("Register \"%s\" has an unsupported size (%d bits)"), |
| 571 | reg->name, reg->bitsize); |
| 572 | return builtin_type_long; |
| 573 | } |
| 574 | |
| 575 | static int |
| 576 | tdesc_remote_register_number (struct gdbarch *gdbarch, int regno) |
| 577 | { |
| 578 | struct tdesc_reg *reg = tdesc_find_register (gdbarch, regno); |
| 579 | |
| 580 | if (reg != NULL) |
| 581 | return reg->target_regnum; |
| 582 | else |
| 583 | return -1; |
| 584 | } |
| 585 | |
| 586 | /* Check whether REGNUM is a member of REGGROUP. Registers from the |
| 587 | target description may be classified as general, float, or vector. |
| 588 | Unlike a gdbarch register_reggroup_p method, this function will |
| 589 | return -1 if it does not know; the caller should handle registers |
| 590 | with no specified group. |
| 591 | |
| 592 | Arbitrary strings (other than "general", "float", and "vector") |
| 593 | from the description are not used; they cause the register to be |
| 594 | displayed in "info all-registers" but excluded from "info |
| 595 | registers" et al. The names of containing features are also not |
| 596 | used. This might be extended to display registers in some more |
| 597 | useful groupings. |
| 598 | |
| 599 | The save-restore flag is also implemented here. */ |
| 600 | |
| 601 | int |
| 602 | tdesc_register_in_reggroup_p (struct gdbarch *gdbarch, int regno, |
| 603 | struct reggroup *reggroup) |
| 604 | { |
| 605 | struct tdesc_reg *reg = tdesc_find_register (gdbarch, regno); |
| 606 | |
| 607 | if (reg != NULL && reg->group != NULL) |
| 608 | { |
| 609 | int general_p = 0, float_p = 0, vector_p = 0; |
| 610 | |
| 611 | if (strcmp (reg->group, "general") == 0) |
| 612 | general_p = 1; |
| 613 | else if (strcmp (reg->group, "float") == 0) |
| 614 | float_p = 1; |
| 615 | else if (strcmp (reg->group, "vector") == 0) |
| 616 | vector_p = 1; |
| 617 | |
| 618 | if (reggroup == float_reggroup) |
| 619 | return float_p; |
| 620 | |
| 621 | if (reggroup == vector_reggroup) |
| 622 | return vector_p; |
| 623 | |
| 624 | if (reggroup == general_reggroup) |
| 625 | return general_p; |
| 626 | } |
| 627 | |
| 628 | if (reg != NULL |
| 629 | && (reggroup == save_reggroup || reggroup == restore_reggroup)) |
| 630 | return reg->save_restore; |
| 631 | |
| 632 | return -1; |
| 633 | } |
| 634 | |
| 635 | /* Check whether REGNUM is a member of REGGROUP. Registers with no |
| 636 | group specified go to the default reggroup function and are handled |
| 637 | by type. */ |
| 638 | |
| 639 | static int |
| 640 | tdesc_register_reggroup_p (struct gdbarch *gdbarch, int regno, |
| 641 | struct reggroup *reggroup) |
| 642 | { |
| 643 | int num_regs = gdbarch_num_regs (gdbarch); |
| 644 | int num_pseudo_regs = gdbarch_num_pseudo_regs (gdbarch); |
| 645 | int ret; |
| 646 | |
| 647 | if (regno >= num_regs && regno < num_regs + num_pseudo_regs) |
| 648 | { |
| 649 | struct tdesc_arch_data *data = gdbarch_data (gdbarch, tdesc_data); |
| 650 | gdb_assert (data->pseudo_register_reggroup_p != NULL); |
| 651 | return data->pseudo_register_reggroup_p (gdbarch, regno, reggroup); |
| 652 | } |
| 653 | |
| 654 | ret = tdesc_register_in_reggroup_p (gdbarch, regno, reggroup); |
| 655 | if (ret != -1) |
| 656 | return ret; |
| 657 | |
| 658 | return default_register_reggroup_p (gdbarch, regno, reggroup); |
| 659 | } |
| 660 | |
| 661 | /* Record architecture-specific functions to call for pseudo-register |
| 662 | support. */ |
| 663 | |
| 664 | void |
| 665 | set_tdesc_pseudo_register_name (struct gdbarch *gdbarch, |
| 666 | gdbarch_register_name_ftype *pseudo_name) |
| 667 | { |
| 668 | struct tdesc_arch_data *data = gdbarch_data (gdbarch, tdesc_data); |
| 669 | |
| 670 | data->pseudo_register_name = pseudo_name; |
| 671 | } |
| 672 | |
| 673 | void |
| 674 | set_tdesc_pseudo_register_type (struct gdbarch *gdbarch, |
| 675 | gdbarch_register_type_ftype *pseudo_type) |
| 676 | { |
| 677 | struct tdesc_arch_data *data = gdbarch_data (gdbarch, tdesc_data); |
| 678 | |
| 679 | data->pseudo_register_type = pseudo_type; |
| 680 | } |
| 681 | |
| 682 | void |
| 683 | set_tdesc_pseudo_register_reggroup_p |
| 684 | (struct gdbarch *gdbarch, |
| 685 | gdbarch_register_reggroup_p_ftype *pseudo_reggroup_p) |
| 686 | { |
| 687 | struct tdesc_arch_data *data = gdbarch_data (gdbarch, tdesc_data); |
| 688 | |
| 689 | data->pseudo_register_reggroup_p = pseudo_reggroup_p; |
| 690 | } |
| 691 | |
| 692 | /* Update GDBARCH to use the target description for registers. */ |
| 693 | |
| 694 | void |
| 695 | tdesc_use_registers (struct gdbarch *gdbarch, |
| 696 | struct tdesc_arch_data *early_data) |
| 697 | { |
| 698 | int num_regs = gdbarch_num_regs (gdbarch); |
| 699 | int i, ixf, ixr; |
| 700 | const struct target_desc *target_desc; |
| 701 | struct tdesc_feature *feature; |
| 702 | struct tdesc_reg *reg; |
| 703 | struct tdesc_arch_data *data; |
| 704 | htab_t reg_hash; |
| 705 | |
| 706 | target_desc = gdbarch_target_desc (gdbarch); |
| 707 | |
| 708 | /* We can't use the description for registers if it doesn't describe |
| 709 | any. This function should only be called after validating |
| 710 | registers, so the caller should know that registers are |
| 711 | included. */ |
| 712 | gdb_assert (tdesc_has_registers (target_desc)); |
| 713 | |
| 714 | data = gdbarch_data (gdbarch, tdesc_data); |
| 715 | data->registers = early_data->registers; |
| 716 | xfree (early_data); |
| 717 | |
| 718 | /* Build up a set of all registers, so that we can assign register |
| 719 | numbers where needed. The hash table expands as necessary, so |
| 720 | the initial size is arbitrary. */ |
| 721 | reg_hash = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL); |
| 722 | for (ixf = 0; |
| 723 | VEC_iterate (tdesc_feature_p, target_desc->features, ixf, feature); |
| 724 | ixf++) |
| 725 | for (ixr = 0; |
| 726 | VEC_iterate (tdesc_reg_p, feature->registers, ixr, reg); |
| 727 | ixr++) |
| 728 | { |
| 729 | void **slot = htab_find_slot (reg_hash, reg, INSERT); |
| 730 | |
| 731 | *slot = reg; |
| 732 | } |
| 733 | |
| 734 | /* Remove any registers which were assigned numbers by the |
| 735 | architecture. */ |
| 736 | for (ixr = 0; VEC_iterate (tdesc_reg_p, data->registers, ixr, reg); ixr++) |
| 737 | if (reg) |
| 738 | htab_remove_elt (reg_hash, reg); |
| 739 | |
| 740 | /* Assign numbers to the remaining registers and add them to the |
| 741 | list of registers. The new numbers are always above gdbarch_num_regs. |
| 742 | Iterate over the features, not the hash table, so that the order |
| 743 | matches that in the target description. */ |
| 744 | |
| 745 | gdb_assert (VEC_length (tdesc_reg_p, data->registers) <= num_regs); |
| 746 | while (VEC_length (tdesc_reg_p, data->registers) < num_regs) |
| 747 | VEC_safe_push (tdesc_reg_p, data->registers, NULL); |
| 748 | for (ixf = 0; |
| 749 | VEC_iterate (tdesc_feature_p, target_desc->features, ixf, feature); |
| 750 | ixf++) |
| 751 | for (ixr = 0; |
| 752 | VEC_iterate (tdesc_reg_p, feature->registers, ixr, reg); |
| 753 | ixr++) |
| 754 | if (htab_find (reg_hash, reg) != NULL) |
| 755 | { |
| 756 | VEC_safe_push (tdesc_reg_p, data->registers, reg); |
| 757 | num_regs++; |
| 758 | } |
| 759 | |
| 760 | htab_delete (reg_hash); |
| 761 | |
| 762 | /* Update the architecture. */ |
| 763 | set_gdbarch_num_regs (gdbarch, num_regs); |
| 764 | set_gdbarch_register_name (gdbarch, tdesc_register_name); |
| 765 | set_gdbarch_register_type (gdbarch, tdesc_register_type); |
| 766 | set_gdbarch_remote_register_number (gdbarch, |
| 767 | tdesc_remote_register_number); |
| 768 | set_gdbarch_register_reggroup_p (gdbarch, tdesc_register_reggroup_p); |
| 769 | } |
| 770 | \f |
| 771 | |
| 772 | /* Methods for constructing a target description. */ |
| 773 | |
| 774 | static void |
| 775 | tdesc_free_reg (struct tdesc_reg *reg) |
| 776 | { |
| 777 | xfree (reg->name); |
| 778 | xfree (reg->type); |
| 779 | xfree (reg->group); |
| 780 | xfree (reg); |
| 781 | } |
| 782 | |
| 783 | void |
| 784 | tdesc_create_reg (struct tdesc_feature *feature, const char *name, |
| 785 | int regnum, int save_restore, const char *group, |
| 786 | int bitsize, const char *type) |
| 787 | { |
| 788 | struct tdesc_reg *reg = XZALLOC (struct tdesc_reg); |
| 789 | |
| 790 | reg->name = xstrdup (name); |
| 791 | reg->target_regnum = regnum; |
| 792 | reg->save_restore = save_restore; |
| 793 | reg->group = group ? xstrdup (group) : NULL; |
| 794 | reg->bitsize = bitsize; |
| 795 | reg->type = type ? xstrdup (type) : NULL; |
| 796 | |
| 797 | /* If the register's type is target-defined, look it up now. We may not |
| 798 | have easy access to the containing feature when we want it later. */ |
| 799 | reg->gdb_type = tdesc_named_type (feature, reg->type); |
| 800 | |
| 801 | VEC_safe_push (tdesc_reg_p, feature->registers, reg); |
| 802 | } |
| 803 | |
| 804 | static void |
| 805 | tdesc_free_feature (struct tdesc_feature *feature) |
| 806 | { |
| 807 | struct tdesc_reg *reg; |
| 808 | int ix; |
| 809 | |
| 810 | for (ix = 0; VEC_iterate (tdesc_reg_p, feature->registers, ix, reg); ix++) |
| 811 | tdesc_free_reg (reg); |
| 812 | VEC_free (tdesc_reg_p, feature->registers); |
| 813 | |
| 814 | /* There is no easy way to free xmalloc-allocated types, nor is |
| 815 | there a way to allocate types on an obstack not associated with |
| 816 | an objfile. Therefore we never free types. Since we only ever |
| 817 | parse an identical XML document once, this memory leak is mostly |
| 818 | contained. */ |
| 819 | VEC_free (type_p, feature->types); |
| 820 | |
| 821 | xfree (feature->name); |
| 822 | xfree (feature); |
| 823 | } |
| 824 | |
| 825 | struct tdesc_feature * |
| 826 | tdesc_create_feature (struct target_desc *tdesc, const char *name) |
| 827 | { |
| 828 | struct tdesc_feature *new_feature = XZALLOC (struct tdesc_feature); |
| 829 | |
| 830 | new_feature->name = xstrdup (name); |
| 831 | |
| 832 | VEC_safe_push (tdesc_feature_p, tdesc->features, new_feature); |
| 833 | return new_feature; |
| 834 | } |
| 835 | |
| 836 | void |
| 837 | tdesc_record_type (struct tdesc_feature *feature, struct type *type) |
| 838 | { |
| 839 | /* The type's ID should be used as its TYPE_NAME. */ |
| 840 | gdb_assert (TYPE_NAME (type) != NULL); |
| 841 | |
| 842 | VEC_safe_push (type_p, feature->types, type); |
| 843 | } |
| 844 | |
| 845 | struct target_desc * |
| 846 | allocate_target_description (void) |
| 847 | { |
| 848 | return XZALLOC (struct target_desc); |
| 849 | } |
| 850 | |
| 851 | static void |
| 852 | free_target_description (void *arg) |
| 853 | { |
| 854 | struct target_desc *target_desc = arg; |
| 855 | struct tdesc_feature *feature; |
| 856 | struct property *prop; |
| 857 | int ix; |
| 858 | |
| 859 | for (ix = 0; |
| 860 | VEC_iterate (tdesc_feature_p, target_desc->features, ix, feature); |
| 861 | ix++) |
| 862 | tdesc_free_feature (feature); |
| 863 | VEC_free (tdesc_feature_p, target_desc->features); |
| 864 | |
| 865 | for (ix = 0; |
| 866 | VEC_iterate (property_s, target_desc->properties, ix, prop); |
| 867 | ix++) |
| 868 | { |
| 869 | xfree (prop->key); |
| 870 | xfree (prop->value); |
| 871 | } |
| 872 | VEC_free (property_s, target_desc->properties); |
| 873 | |
| 874 | xfree (target_desc); |
| 875 | } |
| 876 | |
| 877 | struct cleanup * |
| 878 | make_cleanup_free_target_description (struct target_desc *target_desc) |
| 879 | { |
| 880 | return make_cleanup (free_target_description, target_desc); |
| 881 | } |
| 882 | |
| 883 | void |
| 884 | set_tdesc_property (struct target_desc *target_desc, |
| 885 | const char *key, const char *value) |
| 886 | { |
| 887 | struct property *prop, new_prop; |
| 888 | int ix; |
| 889 | |
| 890 | gdb_assert (key != NULL && value != NULL); |
| 891 | |
| 892 | for (ix = 0; VEC_iterate (property_s, target_desc->properties, ix, prop); |
| 893 | ix++) |
| 894 | if (strcmp (prop->key, key) == 0) |
| 895 | internal_error (__FILE__, __LINE__, |
| 896 | _("Attempted to add duplicate property \"%s\""), key); |
| 897 | |
| 898 | new_prop.key = xstrdup (key); |
| 899 | new_prop.value = xstrdup (value); |
| 900 | VEC_safe_push (property_s, target_desc->properties, &new_prop); |
| 901 | } |
| 902 | |
| 903 | void |
| 904 | set_tdesc_architecture (struct target_desc *target_desc, |
| 905 | const struct bfd_arch_info *arch) |
| 906 | { |
| 907 | target_desc->arch = arch; |
| 908 | } |
| 909 | \f |
| 910 | |
| 911 | static struct cmd_list_element *tdesc_set_cmdlist, *tdesc_show_cmdlist; |
| 912 | static struct cmd_list_element *tdesc_unset_cmdlist; |
| 913 | |
| 914 | /* Helper functions for the CLI commands. */ |
| 915 | |
| 916 | static void |
| 917 | set_tdesc_cmd (char *args, int from_tty) |
| 918 | { |
| 919 | help_list (tdesc_set_cmdlist, "set tdesc ", -1, gdb_stdout); |
| 920 | } |
| 921 | |
| 922 | static void |
| 923 | show_tdesc_cmd (char *args, int from_tty) |
| 924 | { |
| 925 | cmd_show_list (tdesc_show_cmdlist, from_tty, ""); |
| 926 | } |
| 927 | |
| 928 | static void |
| 929 | unset_tdesc_cmd (char *args, int from_tty) |
| 930 | { |
| 931 | help_list (tdesc_unset_cmdlist, "unset tdesc ", -1, gdb_stdout); |
| 932 | } |
| 933 | |
| 934 | static void |
| 935 | set_tdesc_filename_cmd (char *args, int from_tty, |
| 936 | struct cmd_list_element *c) |
| 937 | { |
| 938 | target_clear_description (); |
| 939 | target_find_description (); |
| 940 | } |
| 941 | |
| 942 | static void |
| 943 | show_tdesc_filename_cmd (struct ui_file *file, int from_tty, |
| 944 | struct cmd_list_element *c, |
| 945 | const char *value) |
| 946 | { |
| 947 | if (value != NULL && *value != '\0') |
| 948 | printf_filtered (_("\ |
| 949 | The target description will be read from \"%s\".\n"), |
| 950 | value); |
| 951 | else |
| 952 | printf_filtered (_("\ |
| 953 | The target description will be read from the target.\n")); |
| 954 | } |
| 955 | |
| 956 | static void |
| 957 | unset_tdesc_filename_cmd (char *args, int from_tty) |
| 958 | { |
| 959 | xfree (target_description_filename); |
| 960 | target_description_filename = NULL; |
| 961 | target_clear_description (); |
| 962 | target_find_description (); |
| 963 | } |
| 964 | |
| 965 | void |
| 966 | _initialize_target_descriptions (void) |
| 967 | { |
| 968 | tdesc_data = gdbarch_data_register_pre_init (tdesc_data_init); |
| 969 | |
| 970 | add_prefix_cmd ("tdesc", class_maintenance, set_tdesc_cmd, _("\ |
| 971 | Set target description specific variables."), |
| 972 | &tdesc_set_cmdlist, "set tdesc ", |
| 973 | 0 /* allow-unknown */, &setlist); |
| 974 | add_prefix_cmd ("tdesc", class_maintenance, show_tdesc_cmd, _("\ |
| 975 | Show target description specific variables."), |
| 976 | &tdesc_show_cmdlist, "show tdesc ", |
| 977 | 0 /* allow-unknown */, &showlist); |
| 978 | add_prefix_cmd ("tdesc", class_maintenance, unset_tdesc_cmd, _("\ |
| 979 | Unset target description specific variables."), |
| 980 | &tdesc_unset_cmdlist, "unset tdesc ", |
| 981 | 0 /* allow-unknown */, &unsetlist); |
| 982 | |
| 983 | add_setshow_filename_cmd ("filename", class_obscure, |
| 984 | &target_description_filename, |
| 985 | _("\ |
| 986 | Set the file to read for an XML target description"), _("\ |
| 987 | Show the file to read for an XML target description"), _("\ |
| 988 | When set, GDB will read the target description from a local\n\ |
| 989 | file instead of querying the remote target."), |
| 990 | set_tdesc_filename_cmd, |
| 991 | show_tdesc_filename_cmd, |
| 992 | &tdesc_set_cmdlist, &tdesc_show_cmdlist); |
| 993 | |
| 994 | add_cmd ("filename", class_obscure, unset_tdesc_filename_cmd, _("\ |
| 995 | Unset the file to read for an XML target description. When unset,\n\ |
| 996 | GDB will read the description from the target."), |
| 997 | &tdesc_unset_cmdlist); |
| 998 | } |