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/*

 * Copyright (c) 2008 Jiri Svoboda

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/** @addtogroup generic

 * @{

 */

/** @file

 */

#ifndef KERN_UDEBUG_H_

#define KERN_UDEBUG_H_

#include <ipc/ipc.h>

typedef enum { /* udebug_method_t */

/** Start debugging the recipient.

 * Causes all threads in the receiving task to stop. When they

 * are all stoped, an answer with retval 0 is generated.

 */

UDEBUG_M_BEGIN = 1,

/** Finish debugging the recipient.

 * Answers all pending GO and GUARD messages.

 */

UDEBUG_M_END,

/** Set which events should be captured.

 */

UDEBUG_M_SET_EVMASK,

/** Make sure the debugged task is still there.

 * This message is answered when the debugged task dies

 * or the debugging session ends.

 */

UDEBUG_M_GUARD,

/** Run a thread until a debugging event occurs.

 * This message is answered when the thread stops

 * in a debugging event.

 *

 * - ARG2 - id of the thread to run

 */

UDEBUG_M_GO,

/** Stop a thread being debugged.

 * Creates a special STOP event in the thread, causing

 * it to answer a pending GO message (if any).

 */

UDEBUG_M_STOP,

/** Read arguments of a syscall.

 *

 * - ARG2 - thread identification

 * - ARG3 - destination address in the caller's address space

 *

 */

UDEBUG_M_ARGS_READ,

/** Read thread's userspace register state (istate_t).

 *

 * - ARG2 - thread identification

 * - ARG3 - destination address in the caller's address space

 *

 * or, on error, retval will be

 * - ENOENT - thread does not exist

 * - EBUSY - register state not available

 */

UDEBUG_M_REGS_READ,

/** Write thread's userspace register state (istate_t).

 *

 * - ARG2 - thread identification

 * - ARG3 - source address in the caller's address space

 *

 * or, on error, retval will be

 * - ENOENT - thread does not exist

 * - EBUSY - register state not available

 */

UDEBUG_M_REGS_WRITE,

/** Read the list of the debugged tasks's threads.

 *

 * - ARG2 - destination address in the caller's address space

 * - ARG3 - size of receiving buffer in bytes

 *

 * The kernel fills the buffer with a series of sysarg_t values

 * (thread ids). On answer, the kernel will set:

 *

 * - ARG2 - number of bytes that were actually copied

 * - ARG3 - number of bytes of the complete data

 *

 */

UDEBUG_M_THREAD_READ,

/** Read the debugged tasks's memory.

 *

 * - ARG2 - destination address in the caller's address space

 * - ARG3 - source address in the recipient's address space

 * - ARG4 - size of receiving buffer in bytes

 *

 */

UDEBUG_M_MEM_READ,

/** Write the debugged tasks's memory.

 *

 * - ARG2 - source address in the caller's address space

 * - ARG3 - destination address in the recipient's address space

 * - ARG4 - size of receiving buffer in bytes

 *

 */

UDEBUG_M_MEM_WRITE

} udebug_method_t;

typedef enum {

    UDEBUG_EVENT_FINISHED = 1,  /**< Debuging session has finished */

    UDEBUG_EVENT_STOP,      /**< Stopped on DEBUG_STOP request */

    UDEBUG_EVENT_SYSCALL_B,     /**< Before beginning syscall execution */

    UDEBUG_EVENT_SYSCALL_E,     /**< After finishing syscall execution */

    UDEBUG_EVENT_THREAD_B,      /**< The task created a new thread */

    UDEBUG_EVENT_THREAD_E,      /**< A thread exited */

    UDEBUG_EVENT_BREAKPOINT,    /**< Breakpoint instruction executed */

    UDEBUG_EVENT_TRAP       /**< Single-step trap */

} udebug_event_t;

#define UDEBUG_EVMASK(event) (1 << ((event) - 1))

typedef enum {

    UDEBUG_EM_FINISHED  = UDEBUG_EVMASK(UDEBUG_EVENT_FINISHED),

    UDEBUG_EM_STOP      = UDEBUG_EVMASK(UDEBUG_EVENT_STOP),

    UDEBUG_EM_SYSCALL_B = UDEBUG_EVMASK(UDEBUG_EVENT_SYSCALL_B),

    UDEBUG_EM_SYSCALL_E = UDEBUG_EVMASK(UDEBUG_EVENT_SYSCALL_E),

    UDEBUG_EM_THREAD_B  = UDEBUG_EVMASK(UDEBUG_EVENT_THREAD_B),

    UDEBUG_EM_THREAD_E  = UDEBUG_EVMASK(UDEBUG_EVENT_THREAD_E),

    UDEBUG_EM_BREAKPOINT    = UDEBUG_EVMASK(UDEBUG_EVENT_BREAKPOINT),

    UDEBUG_EM_TRAP      = UDEBUG_EVMASK(UDEBUG_EVENT_TRAP),

    UDEBUG_EM_ALL       =

        UDEBUG_EVMASK(UDEBUG_EVENT_FINISHED) |

        UDEBUG_EVMASK(UDEBUG_EVENT_STOP) |

        UDEBUG_EVMASK(UDEBUG_EVENT_SYSCALL_B) |

        UDEBUG_EVMASK(UDEBUG_EVENT_SYSCALL_E) |

        UDEBUG_EVMASK(UDEBUG_EVENT_THREAD_B) |

        UDEBUG_EVMASK(UDEBUG_EVENT_THREAD_E) |

        UDEBUG_EVMASK(UDEBUG_EVENT_BREAKPOINT) |

        UDEBUG_EVMASK(UDEBUG_EVENT_TRAP)

} udebug_evmask_t;

#ifdef KERNEL

#include <synch/mutex.h>

#include <arch/interrupt.h>

#include <atomic.h>

typedef enum {

    /** Task is not being debugged */

    UDEBUG_TS_INACTIVE,

    /** BEGIN operation in progress (waiting for threads to stop) */

    UDEBUG_TS_BEGINNING,

    /** Debugger fully connected */

    UDEBUG_TS_ACTIVE

} udebug_task_state_t;

/** Debugging part of task_t structure.

 */

typedef struct {

    /** Synchronize debug ops on this task / access to this structure */

    mutex_t lock;

    char *lock_owner;

    udebug_task_state_t dt_state;

    call_t *begin_call;

    int not_stoppable_count;

    struct task *debugger;

    udebug_evmask_t evmask;

} udebug_task_t;

/** Debugging part of thread_t structure.

 */

typedef struct {

    /** Synchronize debug ops on this thread / access to this structure. */

    mutex_t lock;

    waitq_t go_wq;

    call_t *go_call;

    unative_t syscall_args[6];

    istate_t *uspace_state;

    /** What type of event are we stopped in or 0 if none. */

    udebug_event_t cur_event;

    bool go;       /**< thread is GO */

    bool stoppable;    /**< thread is stoppable */

    bool debug_active; /**< thread is in a debugging session */

} udebug_thread_t;

struct task;

struct thread;

void udebug_task_init(udebug_task_t *ut);

void udebug_thread_initialize(udebug_thread_t *ut);

void udebug_syscall_event(unative_t a1, unative_t a2, unative_t a3,

    unative_t a4, unative_t a5, unative_t a6, unative_t id, unative_t rc,

    bool end_variant);

void udebug_thread_b_event_attach(struct thread *t, struct task *ta);

void udebug_thread_e_event(void);

void udebug_stoppable_begin(void);

void udebug_stoppable_end(void);

void udebug_before_thread_runs(void);

void udebug_breakpoint_event(uintptr_t addr);

void udebug_trap_event(uintptr_t addr);

int udebug_task_cleanup(struct task *ta);

#endif

#endif

/** @}

 */