/*-
 * Copyright (c) 2001 Jake Burkholder.
 * All rights reserved.
 *
 * 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.
 */

#ifndef _MACHINE_STACK_H_
#define _MACHINE_STACK_H_

#define INKERNEL(va) \
        ((va) >= VM_MIN_KERNEL_ADDRESS && (va) <= VM_MAX_KERNEL_ADDRESS)

struct unwind_state {
        uintptr_t fp;
        uintptr_t pc;
};

bool unwind_frame(struct thread *, struct unwind_state *);

#ifdef _SYS_PROC_H_

#include <machine/pcb.h>

#define GET_STACK_USAGE(total, used) do {                               \
        struct thread *td = curthread;                                  \
        (total) = td->td_kstack_pages * PAGE_SIZE - sizeof(struct pcb); \
        (used) = td->td_kstack + (total) - (vm_offset_t)&td;            \
} while (0)

static __inline bool
kstack_contains(struct thread *td, vm_offset_t va, size_t len)
{
        return (va >= td->td_kstack && va + len >= va &&
            va + len <= td->td_kstack + td->td_kstack_pages * PAGE_SIZE -
            sizeof(struct pcb));
}
#endif  /* _SYS_PROC_H_ */

#endif /* !_MACHINE_STACK_H_ */