xref: /openbsd-src/sys/arch/i386/include/db_machdep.h (revision 42cc995287453fe7fb6ceff91e03eacadaa32611)

/*	$OpenBSD: db_machdep.h,v 1.30 2021/08/30 08:11:12 jasper Exp $	*/
/*	$NetBSD: db_machdep.h,v 1.9 1996/05/03 19:23:59 christos 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@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	_MACHINE_DB_MACHDEP_H_
#define	_MACHINE_DB_MACHDEP_H_

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

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

typedef	long		db_expr_t;	/* expression - signed */

typedef struct trapframe db_regs_t;
extern db_regs_t	ddb_regs;	/* register state */

#define	PC_REGS(regs)	((vaddr_t)(regs)->tf_eip)
#define	SET_PC_REGS(regs, value) (regs)->tf_eip = (int)(value)

#define	BKPT_INST	0xcc		/* breakpoint instruction */
#define	BKPT_SIZE	(1)		/* size of breakpoint inst */
#define	BKPT_SET(inst)	(BKPT_INST)

#define	SSF_INST	0x55
#define	SSF_SIZE	(1)

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

#define	db_clear_single_step(regs)	((regs)->tf_eflags &= ~PSL_T)
#define	db_set_single_step(regs)	((regs)->tf_eflags |=  PSL_T)

#define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_BPTFLT)
#define IS_WATCHPOINT_TRAP(type, code)	((type) == T_TRCTRAP && (code) & 15)

#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 DB_MACHINE_COMMANDS

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

int db_ktrap(int, int, db_regs_t *);

void db_machine_init(void);
int db_enter_ddb(void);
void db_startcpu(int);
void db_stopcpu(int);
void i386_ipi_db(struct cpu_info *);

extern struct db_mutex ddb_mp_mutex;

/* For ddb_state */
#define DDB_STATE_NOT_RUNNING	0
#define DDB_STATE_RUNNING	1
#define DDB_STATE_EXITING	2

#endif	/* _MACHINE_DB_MACHDEP_H_ */