xref: /src/sys/arch/sh3/include/db_machdep.h

/*	$NetBSD: db_machdep.h,v 1.2 2000/06/29 07:44:03 mrg Exp $	*/

/*
 * 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 (at) 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.
 */

#ifndef	_SH3_DB_MACHDEP_H_
#define	_SH3_DB_MACHDEP_H_

/*
 * Machine-dependent defines for new kernel debugger.
 */

#include <sys/param.h>
#include <uvm/uvm_extern.h>
#include <machine/trap.h>

typedef	vm_offset_t	db_addr_t;	/* address - unsigned */
#if 1
typedef	long		db_expr_t;	/* expression - signed */
#else
typedef	short		db_expr_t;	/* expression - signed */
#endif

typedef struct trapframe db_regs_t;
db_regs_t	ddb_regs;	/* register state */
#define	DDB_REGS	(&ddb_regs)

#define	PC_REGS(regs)	((db_addr_t)(regs)->tf_spc)

#define	BKPT_INST	0xc3c3		/* breakpoint instruction */
#define	BKPT_SIZE	(2)		/* size of breakpoint inst */
#define	BKPT_SET(inst)	(BKPT_INST)

#define	FIXUP_PC_AFTER_BREAK(regs)	((regs)->tf_spc -= BKPT_SIZE)

#define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_USERBREAK)
#define IS_WATCHPOINT_TRAP(type, code)	(0) /* XXX (msaitoh) */

#define	I_CALL		0xe8
#define	I_CALLI		0xff
#define	I_RET		0xc3
#define	I_IRET		0xcf

#define	inst_trap_return(ins)	(((ins)&0xff) == I_IRET)
#define	inst_return(ins)	(((ins)&0xff) == I_RET)
#define	inst_call(ins)		(((ins)&0xff) == I_CALL || \
				 (((ins)&0xff) == I_CALLI && \
				  ((ins)&0x3800) == 0x1000))
#define inst_load(ins)		0
#define inst_store(ins)		0

/* access capability and access macros */

#define DB_ACCESS_LEVEL		2	/* access any space */
#define DB_CHECK_ACCESS(addr, size, task)			\
	db_check_access(addr, size, task)
#define DB_PHYS_EQ(task1, addr1, task2, addr2)			\
	db_phys_eq(task1, addr1, task2, addr2)
#define DB_VALID_KERN_ADDR(addr)				\
	((addr) >= VM_MIN_KERNEL_ADDRESS && 			\
	 (addr) < VM_MAX_KERNEL_ADDRESS)
#define DB_VALID_ADDRESS(addr, user)				\
	((!(user) && DB_VALID_KERN_ADDR(addr)) ||		\
	 ((user) && (addr) < VM_MAX_ADDRESS))

#if 0
boolean_t 	db_check_access __P((vm_offset_t, int, task_t));
boolean_t	db_phys_eq __P((task_t, vm_offset_t, task_t, vm_offset_t));
#endif

/* macros for printing OS server dependent task name */

#define DB_TASK_NAME(task)	db_task_name(task)
#define DB_TASK_NAME_TITLE	"COMMAND                "
#define DB_TASK_NAME_LEN	23
#define DB_NULL_TASK_NAME	"?                      "

/*
 * Constants for KGDB.
 */
typedef	long		kgdb_reg_t;
#define	KGDB_NUMREGS	14
#define	KGDB_BUFLEN	512

#if 0
void		db_task_name(/* task_t */);
#endif

/* macro for checking if a thread has used floating-point */

#define db_thread_fp_used(thread)	((thread)->pcb->ims.ifps != 0)
#define	next_instr_address(v, b) ((db_addr_t) ((b) ? (v + 4) : ((v) + 2)))

int kdb_trap __P((int, int, db_regs_t *));

/*
 * We use ELF symbols in DDB.
 *
 */
#define	DB_ELF_SYMBOLS
#define	DB_ELFSIZE	32

/*
 * SH cpus have no hardware single-step.
 */
#define SOFTWARE_SSTEP

/* XXX following three functions is not implemented yet. (msaitoh) */
boolean_t inst_branch __P((int inst));
db_addr_t branch_taken __P((int inst, db_addr_t pc, db_regs_t *regs));
boolean_t inst_unconditional_flow_transfer __P((int inst));

#endif	/* _SH3_DB_MACHDEP_H_ */