/*-
 * Copyright (c) 2015 The FreeBSD Foundation
 *
 * This software was developed by Andrew Turner under
 * sponsorship from the FreeBSD Foundation.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
 *
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/stack.h>

#include <machine/vmparam.h>
#include <machine/pcb.h>
#include <machine/stack.h>

static void
stack_capture(struct thread *td, struct stack *st, struct unwind_state *frame)
{

        stack_zero(st);
        while (1) {
                if (!unwind_frame(td, frame))
                        break;
                if (!INKERNEL((vm_offset_t)frame->pc))
                        break;
                if (stack_put(st, frame->pc) == -1)
                        break;
        }
}

int
stack_save_td(struct stack *st, struct thread *td)
{
        struct unwind_state frame;

        THREAD_LOCK_ASSERT(td, MA_OWNED);

        if (TD_IS_RUNNING(td))
                return (EOPNOTSUPP);

        frame.fp = td->td_pcb->pcb_x[PCB_FP];
        frame.pc = ADDR_MAKE_CANONICAL(td->td_pcb->pcb_x[PCB_LR]);

        stack_capture(td, st, &frame);
        return (0);
}

void
stack_save(struct stack *st)
{
        struct unwind_state frame;

        frame.fp = (uintptr_t)__builtin_frame_address(0);
        frame.pc = (uintptr_t)stack_save;

        stack_capture(curthread, st, &frame);
}