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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/sys/i386/include/db_machdep.h
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/*-

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 * Mach Operating System

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 * Copyright (c) 1991,1990 Carnegie Mellon University

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 * All Rights Reserved.

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 *

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 * Permission to use, copy, modify and distribute this software and its

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 * documentation is hereby granted, provided that both the copyright

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 * notice and this permission notice appear in all copies of the

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 * software, derivative works or modified versions, and any portions

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 * thereof, and that both notices appear in supporting documentation.

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 *

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 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"

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 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR

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 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.

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 *

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 * Carnegie Mellon requests users of this software to return to

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 *

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 *  Software Distribution Coordinator  or  [email protected]

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 *  School of Computer Science

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 *  Carnegie Mellon University

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 *  Pittsburgh PA 15213-3890

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 *

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 * any improvements or extensions that they make and grant Carnegie Mellon

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 * the rights to redistribute these changes.

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 */

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#ifndef _MACHINE_DB_MACHDEP_H_

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#define	_MACHINE_DB_MACHDEP_H_

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#include <machine/frame.h>

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#include <machine/trap.h>

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typedef	vm_offset_t	db_addr_t;	/* address - unsigned */

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typedef	int		db_expr_t;	/* expression - signed */

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#define	PC_REGS()	((db_addr_t)(kdb_frame->tf_eflags & PSL_VM ?	\

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			    (kdb_frame->tf_eip & 0xffff) +		\

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			    ((kdb_frame->tf_cs & 0xffff) << 4) :	\

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			    kdb_frame->tf_eip))

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#define	BKPT_INST	0xcc		/* breakpoint instruction */

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#define	BKPT_SIZE	(1)		/* size of breakpoint inst */

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#define	BKPT_SET(inst)	(BKPT_INST)

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#define BKPT_SKIP				\

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do {						\

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	kdb_frame->tf_eip += 1;			\

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	kdb_thrctx->pcb_eip += 1;		\

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} while(0)

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#define	FIXUP_PC_AFTER_BREAK			\

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do {						\

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	kdb_frame->tf_eip -= 1;			\

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	kdb_thrctx->pcb_eip -= 1;		\

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} while(0);

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#define	db_clear_single_step	kdb_cpu_clear_singlestep

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#define	db_set_single_step	kdb_cpu_set_singlestep

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/*

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 * The debug exception type is copied from %dr6 to 'code' and used to

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 * disambiguate single step traps.  Watchpoints have no special support.

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 * Our hardware breakpoints are not well integrated with ddb and are too

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 * different from watchpoints.  ddb treats them as unknown traps with

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 * unknown addresses and doesn't turn them off while it is running.

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 */

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#define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_BPTFLT)

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#define	IS_SSTEP_TRAP(type, code)					\

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	((type) == T_TRCTRAP && (code) & DBREG_DR6_BS)

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#define	IS_WATCHPOINT_TRAP(type, code)	0

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#define	I_CALL		0xe8

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#define	I_CALLI		0xff

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#define	I_RET		0xc3

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#define	I_IRET		0xcf

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#define	inst_trap_return(ins)	(((ins)&0xff) == I_IRET)

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#define	inst_return(ins)	(((ins)&0xff) == I_RET)

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#define	inst_call(ins)		(((ins)&0xff) == I_CALL || \

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				 (((ins)&0xff) == I_CALLI && \

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				  ((ins)&0x3800) == 0x1000))

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#define inst_load(ins)		0

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#define inst_store(ins)		0

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int	db_segsize(struct trapframe *tfp);

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#endif /* !_MACHINE_DB_MACHDEP_H_ */

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