path: root/src/target/target.h

/***************************************************************************
 *   Copyright (C) 2005 by Dominic Rath                                    *
 *   Dominic.Rath@gmx.de                                                   *
 *                                                                         *
 *   Copyright (C) 2007-2010 Øyvind Harboe                                 *
 *   oyvind.harboe@zylin.com                                               *
 *                                                                         *
 *   Copyright (C) 2008 by Spencer Oliver                                  *
 *   spen@spen-soft.co.uk                                                  *
 *                                                                         *
 *   Copyright (C) 2011 by Broadcom Corporation                            *
 *   Evan Hunter - ehunter@broadcom.com                                    *
 *                                                                         *
 *   Copyright (C) ST-Ericsson SA 2011                                     *
 *   michel.jaouen@stericsson.com : smp minimum support                    *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
 ***************************************************************************/

#ifndef TARGET_H
#define TARGET_H

#include <helper/list.h>

struct reg;
struct trace;
struct command_context;
struct breakpoint;
struct watchpoint;
struct mem_param;
struct reg_param;
struct target_list;
struct gdb_fileio_info;

/*
 * TARGET_UNKNOWN = 0: we don't know anything about the target yet
 * TARGET_RUNNING = 1: the target is executing user code
 * TARGET_HALTED  = 2: the target is not executing code, and ready to talk to the
 * debugger. on an xscale it means that the debug handler is executing
 * TARGET_RESET   = 3: the target is being held in reset (only a temporary state,
 * not sure how this is used with all the recent changes)
 * TARGET_DEBUG_RUNNING = 4: the target is running, but it is executing code on
 * behalf of the debugger (e.g. algorithm for flashing)
 *
 * also see: target_state_name();
 */

enum target_state {
	TARGET_UNKNOWN = 0,
	TARGET_RUNNING = 1,
	TARGET_HALTED = 2,
	TARGET_RESET = 3,
	TARGET_DEBUG_RUNNING = 4,
};

enum nvp_assert {
	NVP_DEASSERT,
	NVP_ASSERT,
};

enum target_reset_mode {
	RESET_UNKNOWN = 0,
	RESET_RUN = 1,		/* reset and let target run */
	RESET_HALT = 2,		/* reset and halt target out of reset */
	RESET_INIT = 3,		/* reset and halt target out of reset, then run init script */
};

enum target_debug_reason {
	DBG_REASON_DBGRQ = 0,
	DBG_REASON_BREAKPOINT = 1,
	DBG_REASON_WATCHPOINT = 2,
	DBG_REASON_WPTANDBKPT = 3,
	DBG_REASON_SINGLESTEP = 4,
	DBG_REASON_NOTHALTED = 5,
	DBG_REASON_EXIT = 6,
	DBG_REASON_UNDEFINED = 7,
};

enum target_endianness {
	TARGET_ENDIAN_UNKNOWN = 0,
	TARGET_BIG_ENDIAN = 1, TARGET_LITTLE_ENDIAN = 2
};

struct working_area {
	uint32_t address;
	uint32_t size;
	bool free;
	uint8_t *backup;
	struct working_area **user;
	struct working_area *next;
};

struct gdb_service {
	struct target *target;
	/*  field for smp display  */
	/*  element 0 coreid currently displayed ( 1 till n) */
	/*  element 1 coreid to be displayed at next resume 1 till n 0 means resume
	 *  all cores core displayed  */
	int32_t core[2];
};

/* target back off timer */
struct backoff_timer {
	int times;
	int count;
};

/* split target registers into multiple class */
enum target_register_class {
	REG_CLASS_ALL,
	REG_CLASS_GENERAL,
};

/* target_type.h contains the full definition of struct target_type */
struct target {
	struct target_type *type;			/* target type definition (name, access functions) */
	const char *cmd_name;				/* tcl Name of target */
	int target_number;					/* DO NOT USE!  field to be removed in 2010 */
	struct jtag_tap *tap;				/* where on the jtag chain is this */
	int32_t coreid;						/* which device on the TAP? */

	/**
	 * Indicates whether this target has been examined.
	 *
	 * Do @b not access this field directly, use target_was_examined()
	 * or target_set_examined().
	 */
	bool examined;

	/**
	 * true if the  target is currently running a downloaded
	 * "algorithm" instead of arbitrary user code. OpenOCD code
	 * invoking algorithms is trusted to maintain correctness of
	 * any cached state (e.g. for flash status), which arbitrary
	 * code will have no reason to know about.
	 */
	bool running_alg;

	struct target_event_action *event_action;

	int reset_halt;						/* attempt resetting the CPU into the halted mode? */
	uint32_t working_area;				/* working area (initialised RAM). Evaluated
										 * upon first allocation from virtual/physical address. */
	bool working_area_virt_spec;		/* virtual address specified? */
	uint32_t working_area_virt;			/* virtual address */
	bool working_area_phys_spec;		/* virtual address specified? */
	uint32_t working_area_phys;			/* physical address */
	uint32_t working_area_size;			/* size in bytes */
	uint32_t backup_working_area;		/* whether the content of the working area has to be preserved */
	struct working_area *working_areas;/* list of allocated working areas */
	enum target_debug_reason debug_reason;/* reason why the target entered debug state */
	enum target_endianness endianness;	/* target endianness */
	/* also see: target_state_name() */
	enum target_state state;			/* the current backend-state (running, halted, ...) */
	struct reg_cache *reg_cache;		/* the first register cache of the target (core regs) */
	struct breakpoint *breakpoints;		/* list of breakpoints */
	struct watchpoint *watchpoints;		/* list of watchpoints */
	struct trace *trace_info;			/* generic trace information */
	struct debug_msg_receiver *dbgmsg;	/* list of debug message receivers */
	uint32_t dbg_msg_enabled;			/* debug message status */
	void *arch_info;					/* architecture specific information */
	struct target *next;				/* next target in list */

	int display;						/* display async info in telnet session. Do not display
										 * lots of halted/resumed info when stepping in debugger. */
	bool halt_issued;					/* did we transition to halted state? */
	long long halt_issued_time;			/* Note time when halt was issued */

	bool dbgbase_set;					/* By default the debug base is not set */
	uint32_t dbgbase;					/* Really a Cortex-A specific option, but there is no
										 * system in place to support target specific options
										 * currently. */
	struct rtos *rtos;					/* Instance of Real Time Operating System support */
	bool rtos_auto_detect;				/* A flag that indicates that the RTOS has been specified as "auto"
										 * and must be detected when symbols are offered */
	struct backoff_timer backoff;
	int smp;							/* add some target attributes for smp support */
	struct target_list *head;
	/* the gdb service is there in case of smp, we have only one gdb server
	 * for all smp target
	 * the target attached to the gdb is changing dynamically by changing
	 * gdb_service->target pointer */
	struct gdb_service *gdb_service;

	/* file-I/O information for host to do syscall */
	struct gdb_fileio_info *fileio_info;
};

struct target_list {
	struct target *target;
	struct target_list *next;
};

struct gdb_fileio_info {
	char *identifier;
	uint32_t param_1;
	uint32_t param_2;
	uint32_t param_3;
	uint32_t param_4;
};

/** Returns the instance-specific name of the specified target. */
static inline const char *target_name(struct target *target)
{
	return target->cmd_name;
}

const char *debug_reason_name(struct target *t);

enum target_event {

	/* allow GDB to do stuff before others handle the halted event,
	 * this is in lieu of defining ordering of invocation of events,
	 * which would be more complicated
	 *
	 * Telling GDB to halt does not mean that the target stopped running,
	 * simply that we're dropping out of GDB's waiting for step or continue.
	 *
	 * This can be useful when e.g. detecting power dropout.
	 */
	TARGET_EVENT_GDB_HALT,
	TARGET_EVENT_HALTED,		/* target entered debug state from normal execution or reset */
	TARGET_EVENT_RESUMED,		/* target resumed to normal execution */
	TARGET_EVENT_RESUME_START,
	TARGET_EVENT_RESUME_END,

	TARGET_EVENT_GDB_START, /* debugger started execution (step/run) */
	TARGET_EVENT_GDB_END, /* debugger stopped execution (step/run) */

	TARGET_EVENT_RESET_START,
	TARGET_EVENT_RESET_ASSERT_PRE,
	TARGET_EVENT_RESET_ASSERT,	/* C code uses this instead of SRST */
	TARGET_EVENT_RESET_ASSERT_POST,
	TARGET_EVENT_RESET_DEASSERT_PRE,
	TARGET_EVENT_RESET_DEASSERT_POST,
	TARGET_EVENT_RESET_HALT_PRE,
	TARGET_EVENT_RESET_HALT_POST,
	TARGET_EVENT_RESET_WAIT_PRE,
	TARGET_EVENT_RESET_WAIT_POST,
	TARGET_EVENT_RESET_INIT,
	TARGET_EVENT_RESET_END,

	TARGET_EVENT_DEBUG_HALTED,	/* target entered debug state, but was executing on behalf of the debugger */
	TARGET_EVENT_DEBUG_RESUMED, /* target resumed to execute on behalf of the debugger */

	TARGET_EVENT_EXAMINE_START,
	TARGET_EVENT_EXAMINE_END,

	TARGET_EVENT_GDB_ATTACH,
	TARGET_EVENT_GDB_DETACH,

	TARGET_EVENT_GDB_FLASH_ERASE_START,
	TARGET_EVENT_GDB_FLASH_ERASE_END,
	TARGET_EVENT_GDB_FLASH_WRITE_START,
	TARGET_EVENT_GDB_FLASH_WRITE_END,

	TARGET_EVENT_TRACE_CONFIG,
};

struct target_event_action {
	enum target_event event;
	struct Jim_Interp *interp;
	struct Jim_Obj *body;
	int has_percent;
	struct target_event_action *next;
};

bool target_has_event_action(struct target *target, enum target_event event);

struct target_event_callback {
	int (*callback)(struct target *target, enum