src/target/target.h

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007,2008,2009 Øyvind Harboe                            *
   6  *   oyvind.harboe@zylin.com                                               *
   7  *                                                                         *
   8  *   Copyright (C) 2008 by Spencer Oliver                                  *
   9  *   spen@spen-soft.co.uk                                                  *
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  *   This program is distributed in the hope that it will be useful,       *
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  19  *   GNU General Public License for more details.                          *
  20  *                                                                         *
  21  *   You should have received a copy of the GNU General Public License     *
  22  *   along with this program; if not, write to the                         *
  23  *   Free Software Foundation, Inc.,                                       *
  24  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  25  ***************************************************************************/
  26 #ifndef TARGET_H
  27 #define TARGET_H
  28
  29 #include <stddef.h>
  30
  31 #include "breakpoints.h"
  32 #include "algorithm.h"
  33 #include "command.h"
  34
  35 struct reg_s;
  36 struct trace_s;
  37 struct command_context_s;
  38
  39
  40 /**
  41  * Cast a member of a structure out to the containing structure.
  42  * @param ptr The pointer to the member.
  43  * @param type The type of the container struct this is embedded in.
  44  * @param member The name of the member within the struct.
  45  *
  46  * This is a mechanism which is used throughout the Linux kernel.
  47  */
  48 #define container_of(ptr, type, member) ({                      \
  49         const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
  50         (type *)( (char *)__mptr - offsetof(type,member) );})
  51
  52 /*
  53  * TARGET_UNKNOWN = 0: we don't know anything about the target yet
  54  * TARGET_RUNNING = 1: the target is executing user code
  55  * TARGET_HALTED  = 2: the target is not executing code, and ready to talk to the
  56  * debugger. on an xscale it means that the debug handler is executing
  57  * TARGET_RESET   = 3: the target is being held in reset (only a temporary state,
  58  * not sure how this is used with all the recent changes)
  59  * TARGET_DEBUG_RUNNING = 4: the target is running, but it is executing code on
  60  * behalf of the debugger (e.g. algorithm for flashing)
  61  *
  62  * also see: target_state_name();
  63  */
  64
  65
  66 enum target_state
  67 {
  68         TARGET_UNKNOWN = 0,
  69         TARGET_RUNNING = 1,
  70         TARGET_HALTED = 2,
  71         TARGET_RESET = 3,
  72         TARGET_DEBUG_RUNNING = 4,
  73 };
  74
  75 extern const Jim_Nvp nvp_target_state[];
  76
  77 enum nvp_assert {
  78         NVP_DEASSERT,
  79         NVP_ASSERT,
  80 };
  81
  82 extern const Jim_Nvp nvp_assert[];
  83
  84 enum target_reset_mode
  85 {
  86         RESET_UNKNOWN = 0,
  87         RESET_RUN = 1,          /* reset and let target run */
  88         RESET_HALT = 2,         /* reset and halt target out of reset */
  89         RESET_INIT = 3,         /* reset and halt target out of reset, then run init script */
  90 };
  91
  92 extern const Jim_Nvp nvp_reset_mode[];
  93
  94 enum target_debug_reason
  95 {
  96         DBG_REASON_DBGRQ = 0,
  97         DBG_REASON_BREAKPOINT = 1,
  98         DBG_REASON_WATCHPOINT = 2,
  99         DBG_REASON_WPTANDBKPT = 3,
 100         DBG_REASON_SINGLESTEP = 4,
 101         DBG_REASON_NOTHALTED = 5,
 102         DBG_REASON_UNDEFINED = 6
 103 };
 104
 105 extern const Jim_Nvp nvp_target_debug_reason[];
 106
 107 enum target_endianess
 108 {
 109         TARGET_ENDIAN_UNKNOWN = 0,
 110         TARGET_BIG_ENDIAN = 1, TARGET_LITTLE_ENDIAN = 2
 111 };
 112
 113 extern const Jim_Nvp nvp_target_endian[];
 114
 115 struct target_s;
 116
 117 struct working_area
 118 {
 119         uint32_t address;
 120         uint32_t size;
 121         int free;
 122         uint8_t *backup;
 123         struct working_area **user;
 124         struct working_area *next;
 125 };
 126
 127 // target_type.h contains the full definitionof struct target_type_s
 128 struct target_type_s;
 129 typedef struct target_type_s target_type_t;
 130
 131 /* forward decloration */
 132 typedef struct target_event_action_s target_event_action_t;
 133
 134 typedef struct target_s
 135 {
 136         target_type_t *type;                            /* target type definition (name, access functions) */
 137         const char *cmd_name;                           /* tcl Name of target */
 138         int target_number;                                      /* DO NOT USE!  field to be removed in 2010 */
 139         struct jtag_tap *tap;                                   /* where on the jtag chain is this */
 140         const char *variant;                            /* what varient of this chip is it? */
 141         target_event_action_t *event_action;
 142
 143         int reset_halt;                                         /* attempt resetting the CPU into the halted mode? */
 144         uint32_t working_area;                                  /* working area (initialized RAM). Evaluated
 145                                                                                  * upon first allocation from virtual/physical address. */
 146         bool working_area_virt_spec;            /* virtual address specified? */
 147         uint32_t working_area_virt;                     /* virtual address */
 148         bool working_area_phys_spec;            /* virtual address specified? */
 149         uint32_t working_area_phys;                     /* physical address */
 150         uint32_t working_area_size;                     /* size in bytes */
 151         uint32_t backup_working_area;                   /* whether the content of the working area has to be preserved */
 152         struct working_area *working_areas;/* list of allocated working areas */
 153         enum target_debug_reason debug_reason;/* reason why the target entered debug state */
 154         enum target_endianess endianness;       /* target endianess */
 155         // also see: target_state_name()
 156         enum target_state state;                        /* the current backend-state (running, halted, ...) */
 157         struct reg_cache *reg_cache;            /* the first register cache of the target (core regs) */
 158         struct breakpoint_s *breakpoints;       /* list of breakpoints */
 159         struct watchpoint *watchpoints; /* list of watchpoints */
 160         struct trace_s *trace_info;                     /* generic trace information */
 161         struct debug_msg_receiver_s *dbgmsg;/* list of debug message receivers */
 162         uint32_t dbg_msg_enabled;                               /* debug message status */
 163         void *arch_info;                                        /* architecture specific information */
 164         struct target_s *next;                          /* next target in list */
 165
 166         int display;                                            /* display async info in telnet session. Do not display
 167                                                                                  * lots of halted/resumed info when stepping in debugger. */
 168         bool halt_issued;                                       /* did we transition to halted state? */
 169         long long halt_issued_time;                     /* Note time when halt was issued */
 170 } target_t;
 171
 172 enum target_event
 173 {
 174         /* LD historical names
 175          * - Prior to the great TCL change
 176          * - June/July/Aug 2008
 177          * - Duane Ellis */
 178         TARGET_EVENT_OLD_gdb_program_config,
 179         TARGET_EVENT_OLD_pre_reset,
 180         TARGET_EVENT_OLD_post_reset,
 181         TARGET_EVENT_OLD_pre_resume,
 182
 183         /* allow GDB to do stuff before others handle the halted event,
 184          * this is in lieu of defining ordering of invocation of events,
 185          * which would be more complicated
 186          *
 187          * Telling GDB to halt does not mean that the target stopped running,
 188          * simply that we're dropping out of GDB's waiting for step or continue.
 189          *
 190          * This can be useful when e.g. detecting power dropout.
 191          */
 192         TARGET_EVENT_GDB_HALT,
 193         TARGET_EVENT_HALTED,            /* target entered debug state from normal execution or reset */
 194         TARGET_EVENT_RESUMED,           /* target resumed to normal execution */
 195         TARGET_EVENT_RESUME_START,
 196         TARGET_EVENT_RESUME_END,
 197
 198         TARGET_EVENT_GDB_START, /* debugger started execution (step/run) */
 199         TARGET_EVENT_GDB_END, /* debugger stopped execution (step/run) */
 200
 201         TARGET_EVENT_RESET_START,
 202         TARGET_EVENT_RESET_ASSERT_PRE,
 203         TARGET_EVENT_RESET_ASSERT_POST,
 204         TARGET_EVENT_RESET_DEASSERT_PRE,
 205         TARGET_EVENT_RESET_DEASSERT_POST,
 206         TARGET_EVENT_RESET_HALT_PRE,
 207         TARGET_EVENT_RESET_HALT_POST,
 208         TARGET_EVENT_RESET_WAIT_PRE,
 209         TARGET_EVENT_RESET_WAIT_POST,
 210         TARGET_EVENT_RESET_INIT,
 211         TARGET_EVENT_RESET_END,
 212
 213         TARGET_EVENT_DEBUG_HALTED,      /* target entered debug state, but was executing on behalf of the debugger */
 214         TARGET_EVENT_DEBUG_RESUMED, /* target resumed to execute on behalf of the debugger */
 215
 216         TARGET_EVENT_EXAMINE_START,
 217         TARGET_EVENT_EXAMINE_END,
 218
 219         TARGET_EVENT_GDB_ATTACH,
 220         TARGET_EVENT_GDB_DETACH,
 221
 222         TARGET_EVENT_GDB_FLASH_ERASE_START,
 223         TARGET_EVENT_GDB_FLASH_ERASE_END,
 224         TARGET_EVENT_GDB_FLASH_WRITE_START,
 225         TARGET_EVENT_GDB_FLASH_WRITE_END,
 226 };
 227
 228 struct target_event_action_s {
 229         enum target_event event;
 230         Jim_Obj *body;
 231         int has_percent;
 232         target_event_action_t *next;
 233  };
 234
 235 struct target_event_callback
 236 {
 237         int (*callback)(struct target_s *target, enum target_event event, void *priv);
 238         void *priv;
 239         struct target_event_callback *next;
 240 };
 241
 242 typedef struct target_timer_callback_s
 243 {
 244         int (*callback)(void *priv);
 245         int time_ms;
 246         int periodic;
 247         struct timeval when;
 248         void *priv;
 249         struct target_timer_callback_s *next;
 250 } target_timer_callback_t;
 251
 252 int target_register_commands(struct command_context_s *cmd_ctx);
 253 int target_register_user_commands(struct command_context_s *cmd_ctx);
 254 int target_init(struct command_context_s *cmd_ctx);
 255 int target_examine(void);
 256 int handle_target(void *priv);
 257 int target_process_reset(struct command_context_s *cmd_ctx,
 258                 enum target_reset_mode reset_mode);
 259
 260 int target_register_event_callback(
 261                 int (*callback)(struct target_s *target,
 262                                 enum target_event event, void *priv),
 263                 void *priv);
 264 int target_unregister_event_callback(
 265                 int (*callback)(struct target_s *target,
 266                                 enum target_event event, void *priv),
 267                 void *priv);
 268 int target_poll(target_t *target);
 269 int target_resume(target_t *target, int current, uint32_t address,
 270                 int handle_breakpoints, int debug_execution);
 271 int target_halt(target_t *target);
 272 int target_call_event_callbacks(target_t *target, enum target_event event);
 273
 274 /**
 275  * The period is very approximate, the callback can happen much more often
 276  * or much more rarely than specified
 277  */
 278 int target_register_timer_callback(int (*callback)(void *priv),
 279                 int time_ms, int periodic, void *priv);
 280 int target_unregister_timer_callback(int (*callback)(void *priv), void *priv);
 281
 282 int target_call_timer_callbacks(void);
 283 /**
 284  * Invoke this to ensure that e.g. polling timer callbacks happen before
 285  * a syncrhonous command completes.
 286  */
 287 int target_call_timer_callbacks_now(void);
 288
 289 target_t* get_current_target(struct command_context_s *cmd_ctx);
 290 target_t *get_target(const char *id);
 291
 292 /**
 293  * Get the target name.
 294  *
 295  * This routine is a wrapper for the target->type->name field.
 296  */
 297 const char *target_get_name(struct target_s *target);
 298
 299 /**
 300  * Examine the specified @a target.
 301  *
 302  * This routine is a wrapper for target->type->examine.
 303  */
 304 int target_examine_one(struct target_s *target);
 305 /// @returns @c true if the target has been examined.
 306 bool target_was_examined(struct target_s *target);
 307 /// Sets the @c examined flag for the given target.
 308 void target_set_examined(struct target_s *target);
 309 /// Reset the @c examined flag for the given target.
 310 void target_reset_examined(struct target_s *target);
 311
 312
 313 /**
 314  * Add the @a breakpoint for @a target.
 315  *
 316  * This routine is a wrapper for target->type->add_breakpoint.
 317  */
 318 int target_add_breakpoint(struct target_s *target,
 319                 struct breakpoint_s *breakpoint);
 320 /**
 321  * Remove the @a breakpoint for @a target.
 322  *
 323  * This routine is a wrapper for target->type->remove_breakpoint.
 324  */
 325 int target_remove_breakpoint(struct target_s *target,
 326                 struct breakpoint_s *breakpoint);
 327 /**
 328  * Add the @a watchpoint for @a target.
 329  *
 330  * This routine is a wrapper for target->type->add_watchpoint.
 331  */
 332 int target_add_watchpoint(struct target_s *target,
 333                 struct watchpoint *watchpoint);
 334 /**
 335  * Remove the @a watchpoint for @a target.
 336  *
 337  * This routine is a wrapper for target->type->remove_watchpoint.
 338  */
 339 int target_remove_watchpoint(struct target_s *target,
 340                 struct watchpoint *watchpoint);
 341
 342 /**
 343  * Obtain the registers for GDB.
 344  *
 345  * This routine is a wrapper for target->type->get_gdb_reg_list.
 346  */
 347 int target_get_gdb_reg_list(struct target_s *target,
 348                 struct reg_s **reg_list[], int *reg_list_size);
 349
 350 /**
 351  * Step the target.
 352  *
 353  * This routine is a wrapper for target->type->step.
 354  */
 355 int target_step(struct target_s *target,
 356                 int current, uint32_t address, int handle_breakpoints);
 357 /**
 358  * Run an algorithm on the @a target given.
 359  *
 360  * This routine is a wrapper for target->type->run_algorithm.
 361  */
 362 int target_run_algorithm(struct target_s *target,
 363                 int num_mem_params, struct mem_param *mem_params,
 364                 int num_reg_params, struct reg_param *reg_param,
 365                 uint32_t entry_point, uint32_t exit_point,
 366                 int timeout_ms, void *arch_info);
 367
 368 /**
 369  * Read @a count items of @a size bytes from the memory of @a target at
 370  * the @a address given.
 371  *
 372  * This routine is a wrapper for target->type->read_memory.
 373  */
 374 int target_read_memory(struct target_s *target,
 375                 uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer);
 376 /**
 377  * Write @a count items of @a size bytes to the memory of @a target at
 378  * the @a address given.
 379  *
 380  * This routine is wrapper for target->type->write_memory.
 381  */
 382 int target_write_memory(struct target_s *target,
 383                 uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer);
 384
 385 /**
 386  * Write @a count items of 4 bytes to the memory of @a target at
 387  * the @a address given.  Because it operates only on whole words,
 388  * this should be faster than target_write_memory().
 389  *
 390  * This routine is wrapper for target->type->bulk_write_memory.
 391  */
 392 int target_bulk_write_memory(struct target_s *target,
 393                 uint32_t address, uint32_t count, uint8_t *buffer);
 394
 395 /*
 396  * Write to target memory using the virtual address.
 397  *
 398  * Note that this fn is used to implement software breakpoints. Targets
 399  * can implement support for software breakpoints to memory marked as read
 400  * only by making this fn write to ram even if it is read only(MMU or
 401  * MPUs).
 402  *
 403  * It is sufficient to implement for writing a single word(16 or 32 in
 404  * ARM32/16 bit case) to write the breakpoint to ram.
 405  *
 406  * The target should also take care of "other things" to make sure that
 407  * software breakpoints can be written using this function. E.g.
 408  * when there is a separate instruction and data cache, this fn must
 409  * make sure that the instruction cache is synced up to the potential
 410  * code change that can happen as a result of the memory write(typically
 411  * by invalidating the cache).
 412  *
 413  * The high level wrapper fn in target.c will break down this memory write
 414  * request to multiple write requests to the target driver to e.g. guarantee
 415  * that writing 4 bytes to an aligned address happens with a single 32 bit
 416  * write operation, thus making this fn suitable to e.g. write to special
 417  * peripheral registers which do not support byte operations.
 418  */
 419 int target_write_buffer(struct target_s *target,
 420                 uint32_t address, uint32_t size, uint8_t *buffer);
 421 int target_read_buffer(struct target_s *target,
 422                 uint32_t address, uint32_t size, uint8_t *buffer);
 423 int target_checksum_memory(struct target_s *target,
 424                 uint32_t address, uint32_t size, uint32_t* crc);
 425 int target_blank_check_memory(struct target_s *target,
 426                 uint32_t address, uint32_t size, uint32_t* blank);
 427 int target_wait_state(target_t *target, enum target_state state, int ms);
 428
 429 /** Return the *name* of this targets current state */
 430 const char *target_state_name( target_t *target );
 431
 432 /* DANGER!!!!!
 433  *
 434  * if "area" passed in to target_alloc_working_area() points to a memory
 435  * location that goes out of scope (e.g. a pointer on the stack), then
 436  * the caller of target_alloc_working_area() is responsible for invoking
 437  * target_free_working_area() before "area" goes out of scope.
 438  *
 439  * target_free_all_working_areas() will NULL out the "area" pointer
 440  * upon resuming or resetting the CPU.
 441  *
 442  */
 443 int target_alloc_working_area(struct target_s *target,
 444                 uint32_t size, struct working_area **area);
 445 int target_free_working_area(struct target_s *target, struct working_area *area);
 446 int target_free_working_area_restore(struct target_s *target,
 447                 struct working_area *area, int restore);
 448 void target_free_all_working_areas(struct target_s *target);
 449 void target_free_all_working_areas_restore(struct target_s *target, int restore);
 450
 451 extern target_t *all_targets;
 452
 453 extern struct target_event_callback *target_event_callbacks;
 454 extern target_timer_callback_t *target_timer_callbacks;
 455
 456 uint32_t target_buffer_get_u32(target_t *target, const uint8_t *buffer);
 457 uint16_t target_buffer_get_u16(target_t *target, const uint8_t *buffer);
 458 uint8_t  target_buffer_get_u8 (target_t *target, const uint8_t *buffer);
 459 void target_buffer_set_u32(target_t *target, uint8_t *buffer, uint32_t value);
 460 void target_buffer_set_u16(target_t *target, uint8_t *buffer, uint16_t value);
 461 void target_buffer_set_u8 (target_t *target, uint8_t *buffer, uint8_t  value);
 462
 463 int target_read_u32(struct target_s *target, uint32_t address, uint32_t *value);
 464 int target_read_u16(struct target_s *target, uint32_t address, uint16_t *value);
 465 int target_read_u8(struct target_s *target, uint32_t address, uint8_t *value);
 466 int target_write_u32(struct target_s *target, uint32_t address, uint32_t value);
 467 int target_write_u16(struct target_s *target, uint32_t address, uint16_t value);
 468 int target_write_u8(struct target_s *target, uint32_t address, uint8_t value);
 469
 470 /* Issues USER() statements with target state information */
 471 int target_arch_state(struct target_s *target);
 472
 473 void target_handle_event(target_t *t, enum target_event e);
 474 void target_all_handle_event(enum target_event e);
 475
 476 #define ERROR_TARGET_INVALID    (-300)
 477 #define ERROR_TARGET_INIT_FAILED (-301)
 478 #define ERROR_TARGET_TIMEOUT    (-302)
 479 #define ERROR_TARGET_NOT_HALTED (-304)
 480 #define ERROR_TARGET_FAILURE    (-305)
 481 #define ERROR_TARGET_UNALIGNED_ACCESS   (-306)
 482 #define ERROR_TARGET_DATA_ABORT (-307)
 483 #define ERROR_TARGET_RESOURCE_NOT_AVAILABLE     (-308)
 484 #define ERROR_TARGET_TRANSLATION_FAULT  (-309)
 485 #define ERROR_TARGET_NOT_RUNNING (-310)
 486 #define ERROR_TARGET_NOT_EXAMINED (-311)
 487
 488 extern const Jim_Nvp nvp_error_target[];
 489
 490 const char *target_strerror_safe(int err);
 491
 492 #endif /* TARGET_H */