/*-
 * Mach Operating System
 * Copyright (c) 1992 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 Mellon
 * the rights to redistribute these changes.
 *
 *      $OpenBSD: db_machdep.h,v 1.2 1997/03/21 00:48:48 niklas Exp $
 *      $NetBSD: db_machdep.h,v 1.4.22.1 2000/08/05 11:10:43 wiz Exp $
 */

/*
 * Machine-dependent defines for new kernel debugger.
 */
#ifndef _POWERPC_DB_MACHDEP_H_
#define _POWERPC_DB_MACHDEP_H_

#include <vm/vm_param.h>
#include <machine/elf.h>

#define DB_ELF_SYMBOLS
#define DB_ELFSIZE      __ELF_WORD_SIZE

typedef vm_offset_t     db_addr_t;      /* address - unsigned */
typedef intptr_t        db_expr_t;      /* expression - signed */

#define PC_REGS(regs)   ((db_addr_t)kdb_thrctx->pcb_lr)

#define BKPT_INST       0x7C810808      /* breakpoint instruction */

#define BKPT_SIZE       (4)             /* size of breakpoint inst */
#define BKPT_SET(inst)  (BKPT_INST)

#define db_clear_single_step    kdb_cpu_clear_singlestep
#define db_set_single_step      kdb_cpu_set_singlestep

#if 0
#define SR_SINGLESTEP   0x400
#define db_clear_single_step(regs)      ((regs)->msr &= ~SR_SINGLESTEP)
#define db_set_single_step(regs)        ((regs)->msr |=  SR_SINGLESTEP)
#endif

#define T_BREAKPOINT    0xffff
#define IS_BREAKPOINT_TRAP(type, code)  ((type) == T_BREAKPOINT)

#define T_WATCHPOINT    0xeeee
#ifdef T_WATCHPOINT
#define IS_WATCHPOINT_TRAP(type, code)  ((type) == T_WATCHPOINT)
#else
#define IS_WATCHPOINT_TRAP(type, code)  0
#endif

#define M_RTS           0xfc0007fe
#define I_RTS           0x4c000020
#define M_BC            0xfc000000
#define I_BC            0x40000000
#define M_B             0xfc000000
#define I_B             0x50000000
#define M_RFI           0xfc0007fe
#define I_RFI           0x4c000064

#define inst_trap_return(ins)   (((ins)&M_RFI) == I_RFI)
#define inst_return(ins)        (((ins)&M_RTS) == I_RTS)
#define inst_call(ins)          (((ins)&M_BC ) == I_BC  || \
                                 ((ins)&M_B  ) == I_B )
#define inst_load(ins)          0
#define inst_store(ins)         0

#endif  /* _POWERPC_DB_MACHDEP_H_ */