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3438 svoboda 1
/*
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 * Copyright (c) 2008 Jiri Svoboda
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup generic
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 * @{
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 */
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/** @file
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 */
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#ifndef KERN_UDEBUG_H_
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#define KERN_UDEBUG_H_
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#include <ipc/ipc.h>
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typedef enum { /* udebug_method_t */
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/** Start debugging the recipient.
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 * Causes all threads in the receiving task to stop. When they
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 * are all stoped, an answer with retval 0 is generated.
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 */
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UDEBUG_M_BEGIN = 1,
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/** Finish debugging the recipient.
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 * Answers all pending GO and GUARD messages.
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 */
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UDEBUG_M_END,
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/** Set which events should be captured.
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 */
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UDEBUG_M_SET_EVMASK,
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/** Make sure the debugged task is still there.
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 * This message is answered when the debugged task dies
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 * or the debugging session ends.
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 */
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UDEBUG_M_GUARD,
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/** Run a thread until a debugging event occurs.
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 * This message is answered when the thread stops
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 * in a debugging event.
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 *
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 * - ARG2 - id of the thread to run
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 */
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UDEBUG_M_GO,
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/** Stop a thread being debugged.
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 * Creates a special STOP event in the thread, causing
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 * it to answer a pending GO message (if any).
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 */
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UDEBUG_M_STOP,
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/** Read arguments of a syscall.
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 *
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 * - ARG2 - thread identification
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 * - ARG3 - destination address in the caller's address space
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 *
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 */
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UDEBUG_M_ARGS_READ,
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/** Read the list of the debugged tasks's threads.
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 *
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 * - ARG2 - destination address in the caller's address space
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 * - ARG3 - size of receiving buffer in bytes
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 *
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 * The kernel fills the buffer with a series of sysarg_t values
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 * (thread ids). On answer, the kernel will set:
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 *
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 * - ARG2 - number of bytes that were actually copied
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 * - ARG3 - number of bytes of the complete data
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 *
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 */
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UDEBUG_M_THREAD_READ,
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/** Read the debugged tasks's memory.
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 *
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 * - ARG2 - destination address in the caller's address space
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 * - ARG3 - source address in the recipient's address space
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 * - ARG4 - size of receiving buffer in bytes
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 *
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 */
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UDEBUG_M_MEM_READ,
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} udebug_method_t;
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typedef enum {
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    UDEBUG_EVENT_FINISHED = 1/**< Debuging session has finished */
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    UDEBUG_EVENT_STOP,      /**< Stopped on DEBUG_STOP request */
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    UDEBUG_EVENT_SYSCALL_B,     /**< Before beginning syscall execution */
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    UDEBUG_EVENT_SYSCALL_E,     /**< After finishing syscall execution */
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    UDEBUG_EVENT_THREAD_B,      /**< The task created a new thread */
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    UDEBUG_EVENT_THREAD_E       /**< A thread exited */
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} udebug_event_t;
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#define UDEBUG_EVMASK(event) (1 << ((event) - 1))
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typedef enum {
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    UDEBUG_EM_FINISHED  = UDEBUG_EVMASK(UDEBUG_EVENT_FINISHED),
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    UDEBUG_EM_STOP      = UDEBUG_EVMASK(UDEBUG_EVENT_STOP),
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    UDEBUG_EM_SYSCALL_B = UDEBUG_EVMASK(UDEBUG_EVENT_SYSCALL_B),
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    UDEBUG_EM_SYSCALL_E = UDEBUG_EVMASK(UDEBUG_EVENT_SYSCALL_E),
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    UDEBUG_EM_THREAD_B  = UDEBUG_EVMASK(UDEBUG_EVENT_THREAD_B),
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    UDEBUG_EM_THREAD_E  = UDEBUG_EVMASK(UDEBUG_EVENT_THREAD_E),
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    UDEBUG_EM_ALL       =
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        UDEBUG_EVMASK(UDEBUG_EVENT_FINISHED) |
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        UDEBUG_EVMASK(UDEBUG_EVENT_STOP) |
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        UDEBUG_EVMASK(UDEBUG_EVENT_SYSCALL_B) |
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        UDEBUG_EVMASK(UDEBUG_EVENT_SYSCALL_E) |
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        UDEBUG_EVMASK(UDEBUG_EVENT_THREAD_B) |
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        UDEBUG_EVMASK(UDEBUG_EVENT_THREAD_E)
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} udebug_evmask_t;
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#ifdef KERNEL
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#include <synch/mutex.h>
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#include <arch/interrupt.h>
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#include <atomic.h>
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typedef enum {
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    /** Task is not being debugged */
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    UDEBUG_TS_INACTIVE,
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    /** BEGIN operation in progress (waiting for threads to stop) */
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    UDEBUG_TS_BEGINNING,
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    /** Debugger fully connected */
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    UDEBUG_TS_ACTIVE,
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    /** Task is shutting down, no more debug activities allowed */
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    UDEBUG_TS_SHUTDOWN
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} udebug_task_state_t;
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/** Debugging part of task_t structure.
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 */
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typedef struct {
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    /** Synchronize debug ops on this task / access to this structure */
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    mutex_t lock;
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    char *lock_owner;
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    udebug_task_state_t dt_state;
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    call_t *begin_call;
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    int not_stoppable_count;
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    struct task *debugger;
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    udebug_evmask_t evmask;
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} udebug_task_t;
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/** Debugging part of thread_t structure.
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 */
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typedef struct {
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    /**
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     * Prevent deadlock with udebug_before_thread_runs() in interrupt
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     * handler, without actually disabling interrupts.
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     * ==0 means "unlocked", >0 means "locked"
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     */
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    atomic_t int_lock;
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    /** Synchronize debug ops on this thread / access to this structure. */
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    mutex_t lock;
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    waitq_t go_wq;
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    call_t *go_call;
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    unative_t syscall_args[6];
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    /** What type of event are we stopped in or 0 if none. */
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    udebug_event_t cur_event;
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    bool go;       /**< thread is GO */
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    bool stoppable;    /**< thread is stoppable */
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    bool debug_active; /**< thread is in a debugging session */
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} udebug_thread_t;
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struct task;
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struct thread;
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void udebug_task_init(udebug_task_t *ut);
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void udebug_thread_initialize(udebug_thread_t *ut);
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void udebug_syscall_event(unative_t a1, unative_t a2, unative_t a3,
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    unative_t a4, unative_t a5, unative_t a6, unative_t id, unative_t rc,
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    bool end_variant);
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void udebug_thread_b_event(struct thread *t);
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void udebug_thread_e_event(void);
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void udebug_stoppable_begin(void);
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void udebug_stoppable_end(void);
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void udebug_before_thread_runs(void);
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int udebug_task_cleanup(struct task *ta);
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#endif
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#endif
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/** @}
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 */