/*-
 * Copyright (c) 2000, 2001 Ben Harris
 * Copyright (c) 1996 Scott K. Stevens
 *
 * Mach Operating System
 * Copyright (c) 1991,1990 Carnegie Mellon University
 * All Rights Reserved.
 *
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 */

#ifndef _MACHINE_STACK_H_
#define _MACHINE_STACK_H_

#define INKERNEL(va)    (((vm_offset_t)(va)) >= VM_MIN_KERNEL_ADDRESS)

#define FR_SCP  (0)
#define FR_RLV  (-1)
#define FR_RSP  (-2)
#define FR_RFP  (-3)

/* The state of the unwind process */
struct unwind_state {
        uint32_t registers[16];
        uint32_t start_pc;
        uint32_t *insn;
        u_int entries;
        u_int byte;
        uint16_t update_mask;
};

/* The register names */
#define FP      11
#define SP      13
#define LR      14
#define PC      15

#ifdef _KERNEL

int unwind_stack_one(struct unwind_state *, int);

struct linker_file;
void unwind_module_loaded(struct linker_file *);
void unwind_module_unloaded(struct linker_file *);

#ifdef _SYS_PROC_H_

#include <machine/pcb.h>

/* Get the current kernel thread stack usage. */
#define GET_STACK_USAGE(total, used) do {                               \
        struct thread *td = curthread;                                  \
        (total) = ptoa(td->td_kstack_pages) - sizeof(struct pcb);       \
        (used) = td->td_kstack + (total) - (char *)&td;                 \
} while (0)

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

#endif

#endif /* !_MACHINE_STACK_H_ */