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;
  36 struct trace;
  37 struct command_context;
  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 working_area
 116 {
 117         uint32_t address;
 118         uint32_t size;
 119         int free;
 120         uint8_t *backup;
 121         struct working_area **user;
 122         struct working_area *next;
 123 };
 124
 125 // target_type.h contains the full definitionof struct targe_type
 126 struct target
 127 {
 128         struct target_type *type;                               /* target type definition (name, access functions) */
 129         const char *cmd_name;                           /* tcl Name of target */
 130         int target_number;                                      /* DO NOT USE!  field to be removed in 2010 */
 131         struct jtag_tap *tap;                                   /* where on the jtag chain is this */
 132         const char *variant;                            /* what varient of this chip is it? */
 133         struct target_event_action *event_action;
 134
 135         int reset_halt;                                         /* attempt resetting the CPU into the halted mode? */
 136         uint32_t working_area;                                  /* working area (initialized RAM). Evaluated
 137                                                                                  * upon first allocation from virtual/physical address. */
 138         bool working_area_virt_spec;            /* virtual address specified? */
 139         uint32_t working_area_virt;                     /* virtual address */
 140         bool working_area_phys_spec;            /* virtual address specified? */
 141         uint32_t working_area_phys;                     /* physical address */
 142         uint32_t working_area_size;                     /* size in bytes */
 143         uint32_t backup_working_area;                   /* whether the content of the working area has to be preserved */
 144         struct working_area *working_areas;/* list of allocated working areas */
 145         enum target_debug_reason debug_reason;/* reason why the target entered debug state */
 146         enum target_endianess endianness;       /* target endianess */
 147         // also see: target_state_name()
 148         enum target_state state;                        /* the current backend-state (running, halted, ...) */
 149         struct reg_cache *reg_cache;            /* the first register cache of the target (core regs) */
 150         struct breakpoint *breakpoints; /* list of breakpoints */
 151         struct watchpoint *watchpoints; /* list of watchpoints */
 152         struct trace *trace_info;                       /* generic trace information */
 153         struct debug_msg_receiver *dbgmsg;/* list of debug message receivers */
 154         uint32_t dbg_msg_enabled;                               /* debug message status */
 155         void *arch_info;                                        /* architecture specific information */
 156         struct target *next;                            /* next target in list */
 157
 158         int display;                                            /* display async info in telnet session. Do not display
 159                                                                                  * lots of halted/resumed info when stepping in debugger. */
 160         bool halt_issued;                                       /* did we transition to halted state? */
 161         long long halt_issued_time;                     /* Note time when halt was issued */
 162 };
 163
 164 enum target_event
 165 {
 166         /* LD historical names
 167          * - Prior to the great TCL change
 168          * - June/July/Aug 2008
 169          * - Duane Ellis */
 170         TARGET_EVENT_OLD_gdb_program_config,
 171         TARGET_EVENT_OLD_pre_reset,
 172         TARGET_EVENT_OLD_post_reset,
 173         TARGET_EVENT_OLD_pre_resume,
 174
 175         /* allow GDB to do stuff before others handle the halted event,
 176          * this is in lieu of defining ordering of invocation of events,
 177          * which would be more complicated
 178          *
 179          * Telling GDB to halt does not mean that the target stopped running,
 180          * simply that we're dropping out of GDB's waiting for step or continue.
 181          *
 182          * This can be useful when e.g. detecting power dropout.
 183          */
 184         TARGET_EVENT_GDB_HALT,
 185         TARGET_EVENT_HALTED,            /* target entered debug state from normal execution or reset */
 186         TARGET_EVENT_RESUMED,           /* target resumed to normal execution */
 187         TARGET_EVENT_RESUME_START,
 188         TARGET_EVENT_RESUME_END,
 189
 190         TARGET_EVENT_GDB_START, /* debugger started execution (step/run) */
 191         TARGET_EVENT_GDB_END, /* debugger stopped execution (step/run) */
 192
 193         TARGET_EVENT_RESET_START,
 194         TARGET_EVENT_RESET_ASSERT_PRE,
 195         TARGET_EVENT_RESET_ASSERT_POST,
 196         TARGET_EVENT_RESET_DEASSERT_PRE,
 197         TARGET_EVENT_RESET_DEASSERT_POST,
 198         TARGET_EVENT_RESET_HALT_PRE,
 199         TARGET_EVENT_RESET_HALT_POST,
 200         TARGET_EVENT_RESET_WAIT_PRE,
 201         TARGET_EVENT_RESET_WAIT_POST,
 202         TARGET_EVENT_RESET_INIT,
 203         TARGET_EVENT_RESET_END,
 204
 205         TARGET_EVENT_DEBUG_HALTED,      /* target entered debug state, but was executing on behalf of the debugger */
 206         TARGET_EVENT_DEBUG_RESUMED, /* target resumed to execute on behalf of the debugger */
 207
 208         TARGET_EVENT_EXAMINE_START,
 209         TARGET_EVENT_EXAMINE_END,
 210
 211         TARGET_EVENT_GDB_ATTACH,
 212         TARGET_EVENT_GDB_DETACH,
 213
 214         TARGET_EVENT_GDB_FLASH_ERASE_START,
 215         TARGET_EVENT_GDB_FLASH_ERASE_END,
 216         TARGET_EVENT_GDB_FLASH_WRITE_START,
 217         TARGET_EVENT_GDB_FLASH_WRITE_END,
 218 };
 219
 220 struct target_event_action {
 221         enum target_event event;
 222         Jim_Obj *body;
 223         int has_percent;
 224         struct target_event_action *next;
 225  };
 226
 227 struct target_event_callback
 228 {
 229         int (*callback)(struct target *target, enum target_event event, void *priv);
 230         void *priv;
 231         struct target_event_callback *next;
 232 };
 233
 234 struct target_timer_callback
 235 {
 236         int (*callback)(void *priv);
 237         int time_ms;
 238         int periodic;
 239         struct timeval when;
 240         void *priv;
 241         struct target_timer_callback *next;
 242 };
 243
 244 int target_register_commands(struct command_context *cmd_ctx);
 245 int target_register_user_commands(struct command_context *cmd_ctx);
 246 int target_init(struct command_context *cmd_ctx);
 247 int target_examine(void);
 248 int handle_target(void *priv);
 249 int target_process_reset(struct command_context *cmd_ctx,
 250                 enum target_reset_mode reset_mode);
 251
 252 int target_register_event_callback(
 253                 int (*callback)(struct target *target,
 254                                 enum target_event event, void *priv),
 255                 void *priv);
 256 int target_unregister_event_callback(
 257                 int (*callback)(struct target *target,
 258                                 enum target_event event, void *priv),
 259                 void *priv);
 260 int target_poll(struct target *target);
 261 int target_resume(struct target *target, int current, uint32_t address,
 262                 int handle_breakpoints, int debug_execution);
 263 int target_halt(struct target *target);
 264 int target_call_event_callbacks(struct target *target, enum target_event event);
 265
 266 /**
 267  * The period is very approximate, the callback can happen much more often
 268  * or much more rarely than specified
 269  */
 270 int target_register_timer_callback(int (*callback)(void *priv),
 271                 int time_ms, int periodic, void *priv);
 272 int target_unregister_timer_callback(int (*callback)(void *priv), void *priv);
 273
 274 int target_call_timer_callbacks(void);
 275 /**
 276  * Invoke this to ensure that e.g. polling timer callbacks happen before
 277  * a syncrhonous command completes.
 278  */
 279 int target_call_timer_callbacks_now(void);
 280
 281 struct target* get_current_target(struct command_context *cmd_ctx);
 282 struct target *get_target(const char *id);
 283
 284 /**
 285  * Get the target name.
 286  *
 287  * This routine is a wrapper for the target->type->name field.
 288  */
 289 const char *target_get_name(struct target *target);
 290
 291 /**
 292  * Examine the specified @a target.
 293  *
 294  * This routine is a wrapper for target->type->examine.
 295  */
 296 int target_examine_one(struct target *target);
 297 /// @returns @c true if the target has been examined.
 298 bool target_was_examined(struct target *target);
 299 /// Sets the @c examined flag for the given target.
 300 void target_set_examined(struct target *target);
 301 /// Reset the @c examined flag for the given target.
 302 void target_reset_examined(struct target *target);
 303
 304
 305 /**
 306  * Add the @a breakpoint for @a target.
 307  *
 308  * This routine is a wrapper for target->type->add_breakpoint.
 309  */
 310 int target_add_breakpoint(struct target *target,
 311                 struct breakpoint *breakpoint);
 312 /**
 313  * Remove the @a breakpoint for @a target.
 314  *
 315  * This routine is a wrapper for target->type->remove_breakpoint.
 316  */
 317 int target_remove_breakpoint(struct target *target,
 318                 struct breakpoint *breakpoint);
 319 /**
 320  * Add the @a watchpoint for @a target.
 321  *
 322  * This routine is a wrapper for target->type->add_watchpoint.
 323  */
 324 int target_add_watchpoint(struct target *target,
 325                 struct watchpoint *watchpoint);
 326 /**
 327  * Remove the @a watchpoint for @a target.
 328  *
 329  * This routine is a wrapper for target->type->remove_watchpoint.
 330  */
 331 int target_remove_watchpoint(struct target *target,
 332                 struct watchpoint *watchpoint);
 333
 334 /**
 335  * Obtain the registers for GDB.
 336  *
 337  * This routine is a wrapper for target->type->get_gdb_reg_list.
 338  */
 339 int target_get_gdb_reg_list(struct target *target,
 340                 struct reg **reg_list[], int *reg_list_size);
 341
 342 /**
 343  * Step the target.
 344  *
 345  * This routine is a wrapper for target->type->step.
 346  */
 347 int target_step(struct target *target,
 348                 int current, uint32_t address, int handle_breakpoints);
 349 /**
 350  * Run an algorithm on the @a target given.
 351  *
 352  * This routine is a wrapper for target->type->run_algorithm.
 353  */
 354 int target_run_algorithm(struct target *target,
 355                 int num_mem_params, struct mem_param *mem_params,
 356                 int num_reg_params, struct reg_param *reg_param,
 357                 uint32_t entry_point, uint32_t exit_point,
 358                 int timeout_ms, void *arch_info);
 359
 360 /**
 361  * Read @a count items of @a size bytes from the memory of @a target at
 362  * the @a address given.
 363  *
 364  * This routine is a wrapper for target->type->read_memory.
 365  */
 366 int target_read_memory(struct target *target,
 367                 uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer);
 368 /**
 369  * Write @a count items of @a size bytes to the memory of @a target at
 370  * the @a address given.
 371  *
 372  * This routine is wrapper for target->type->write_memory.
 373  */
 374 int target_write_memory(struct target *target,
 375                 uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer);
 376
 377 /**
 378  * Write @a count items of 4 bytes to the memory of @a target at
 379  * the @a address given.  Because it operates only on whole words,
 380  * this should be faster than target_write_memory().
 381  *
 382  * This routine is wrapper for target->type->bulk_write_memory.
 383  */
 384 int target_bulk_write_memory(struct target *target,
 385                 uint32_t address, uint32_t count, uint8_t *buffer);
 386
 387 /*
 388  * Write to target memory using the virtual address.
 389  *
 390  * Note that this fn is used to implement software breakpoints. Targets
 391  * can implement support for software breakpoints to memory marked as read
 392  * only by making this fn write to ram even if it is read only(MMU or
 393  * MPUs).
 394  *
 395  * It is sufficient to implement for writing a single word(16 or 32 in
 396  * ARM32/16 bit case) to write the breakpoint to ram.
 397  *
 398  * The target should also take care of "other things" to make sure that
 399  * software breakpoints can be written using this function. E.g.
 400  * when there is a separate instruction and data cache, this fn must
 401  * make sure that the instruction cache is synced up to the potential
 402  * code change that can happen as a result of the memory write(typically
 403  * by invalidating the cache).
 404  *
 405  * The high level wrapper fn in target.c will break down this memory write
 406  * request to multiple write requests to the target driver to e.g. guarantee
 407  * that writing 4 bytes to an aligned address happens with a single 32 bit
 408  * write operation, thus making this fn suitable to e.g. write to special
 409  * peripheral registers which do not support byte operations.
 410  */
 411 int target_write_buffer(struct target *target,
 412                 uint32_t address, uint32_t size, uint8_t *buffer);
 413 int target_read_buffer(struct target *target,
 414                 uint32_t address, uint32_t size, uint8_t *buffer);
 415 int target_checksum_memory(struct target *target,
 416                 uint32_t address, uint32_t size, uint32_t* crc);
 417 int target_blank_check_memory(struct target *target,
 418                 uint32_t address, uint32_t size, uint32_t* blank);
 419 int target_wait_state(struct target *target, enum target_state state, int ms);
 420
 421 /** Return the *name* of this targets current state */
 422 const char *target_state_name( struct target *target );
 423
 424 /* DANGER!!!!!
 425  *
 426  * if "area" passed in to target_alloc_working_area() points to a memory
 427  * location that goes out of scope (e.g. a pointer on the stack), then
 428  * the caller of target_alloc_working_area() is responsible for invoking
 429  * target_free_working_area() before "area" goes out of scope.
 430  *
 431  * target_free_all_working_areas() will NULL out the "area" pointer
 432  * upon resuming or resetting the CPU.
 433  *
 434  */
 435 int target_alloc_working_area(struct target *target,
 436                 uint32_t size, struct working_area **area);
 437 int target_free_working_area(struct target *target, struct working_area *area);
 438 int target_free_working_area_restore(struct target *target,
 439                 struct working_area *area, int restore);
 440 void target_free_all_working_areas(struct target *target);
 441 void target_free_all_working_areas_restore(struct target *target, int restore);
 442
 443 extern struct target *all_targets;
 444
 445 extern struct target_event_callback *target_event_callbacks;
 446 extern struct target_timer_callback *target_timer_callbacks;
 447
 448 uint32_t target_buffer_get_u32(struct target *target, const uint8_t *buffer);
 449 uint16_t target_buffer_get_u16(struct target *target, const uint8_t *buffer);
 450 uint8_t  target_buffer_get_u8 (struct target *target, const uint8_t *buffer);
 451 void target_buffer_set_u32(struct target *target, uint8_t *buffer, uint32_t value);
 452 void target_buffer_set_u16(struct target *target, uint8_t *buffer, uint16_t value);
 453 void target_buffer_set_u8 (struct target *target, uint8_t *buffer, uint8_t  value);
 454
 455 int target_read_u32(struct target *target, uint32_t address, uint32_t *value);
 456 int target_read_u16(struct target *target, uint32_t address, uint16_t *value);
 457 int target_read_u8(struct target *target, uint32_t address, uint8_t *value);
 458 int target_write_u32(struct target *target, uint32_t address, uint32_t value);
 459 int target_write_u16(struct target *target, uint32_t address, uint16_t value);
 460 int target_write_u8(struct target *target, uint32_t address, uint8_t value);
 461
 462 /* Issues USER() statements with target state information */
 463 int target_arch_state(struct target *target);
 464
 465 void target_handle_event(struct target *t, enum target_event e);
 466 void target_all_handle_event(enum target_event e);
 467
 468 #define ERROR_TARGET_INVALID    (-300)
 469 #define ERROR_TARGET_INIT_FAILED (-301)
 470 #define ERROR_TARGET_TIMEOUT    (-302)
 471 #define ERROR_TARGET_NOT_HALTED (-304)
 472 #define ERROR_TARGET_FAILURE    (-305)
 473 #define ERROR_TARGET_UNALIGNED_ACCESS   (-306)
 474 #define ERROR_TARGET_DATA_ABORT (-307)
 475 #define ERROR_TARGET_RESOURCE_NOT_AVAILABLE     (-308)
 476 #define ERROR_TARGET_TRANSLATION_FAULT  (-309)
 477 #define ERROR_TARGET_NOT_RUNNING (-310)
 478 #define ERROR_TARGET_NOT_EXAMINED (-311)
 479
 480 extern const Jim_Nvp nvp_error_target[];
 481
 482 const char *target_strerror_safe(int err);
 483
 484 #endif /* TARGET_H */