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      1 /*	$NetBSD: db_machdep.h,v 1.35 2023/09/26 14:33:55 tsutsui Exp $	*/
      2 
      3 /*
      4  * Mach Operating System
      5  * Copyright (c) 1992 Carnegie Mellon University
      6  * All Rights Reserved.
      7  *
      8  * Permission to use, copy, modify and distribute this software and its
      9  * documentation is hereby granted, provided that both the copyright
     10  * notice and this permission notice appear in all copies of the
     11  * software, derivative works or modified versions, and any portions
     12  * thereof, and that both notices appear in supporting documentation.
     13  *
     14  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     15  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     16  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     17  *
     18  * Carnegie Mellon requests users of this software to return to
     19  *
     20  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     21  *  School of Computer Science
     22  *  Carnegie Mellon University
     23  *  Pittsburgh PA 15213-3890
     24  *
     25  * any improvements or extensions that they make and grant Carnegie Mellon
     26  * the rights to redistribute these changes.
     27  */
     28 
     29 /*
     30  * Machine-dependent defines for new kernel debugger.
     31  */
     32 #ifndef	_M68K_DB_MACHDEP_H_
     33 #define	_M68K_DB_MACHDEP_H_
     34 
     35 #if !defined(_KERNEL) && !defined(_STANDALONE)
     36 #include <stddef.h>
     37 #include <stdbool.h>
     38 #include <string.h>
     39 #endif /* _KERNEL || _STANDALONE */
     40 
     41 #include <sys/types.h>
     42 
     43 #include <uvm/uvm_extern.h>
     44 
     45 #include <machine/frame.h>
     46 #include <machine/pcb.h>
     47 #include <machine/psl.h>
     48 #include <machine/trap.h>
     49 
     50 typedef	vaddr_t		db_addr_t;	/* address - unsigned */
     51 #define	DDB_EXPR_FMT	"l"		/* expression is long */
     52 typedef	long		db_expr_t;	/* expression - signed */
     53 typedef struct trapframe db_regs_t;
     54 
     55 extern db_regs_t	ddb_regs;	/* register state */
     56 #define DDB_REGS	(&ddb_regs)
     57 
     58 #define	PC_REGS(regs)	((regs)->tf_pc)
     59 
     60 #define	BKPT_ADDR(addr)	(addr)		/* breakpoint address */
     61 #define	BKPT_INST	0x4e4f		/* breakpoint instruction */
     62 #define	BKPT_SIZE	(2)		/* size of breakpoint inst */
     63 #define	BKPT_SET(inst, addr)	(BKPT_INST)
     64 
     65 #define	FIXUP_PC_AFTER_BREAK(regs)	((regs)->tf_pc -= BKPT_SIZE)
     66 
     67 #define	db_clear_single_step(regs)	((regs)->tf_sr &= ~PSL_T)
     68 #define	db_set_single_step(regs)	((regs)->tf_sr |=  PSL_T)
     69 
     70 #define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_BREAKPOINT)
     71 #ifdef T_WATCHPOINT
     72 #define	IS_WATCHPOINT_TRAP(type, code)	((type) == T_WATCHPOINT)
     73 #else
     74 #define	IS_WATCHPOINT_TRAP(type, code)	0
     75 #endif
     76 
     77 #define	M_RTS		0xffff0000
     78 #define I_RTS		0x4e750000
     79 #define M_JSR		0xffc00000
     80 #define I_JSR		0x4e800000
     81 #define M_BSR		0xff000000
     82 #define I_BSR		0x61000000
     83 #define	M_RTE		0xffff0000
     84 #define	I_RTE		0x4e730000
     85 
     86 #define	inst_trap_return(ins)	(((ins)&M_RTE) == I_RTE)
     87 #define	inst_return(ins)	(((ins)&M_RTS) == I_RTS)
     88 #define	inst_call(ins)		(((ins)&M_JSR) == I_JSR || \
     89 				 ((ins)&M_BSR) == I_BSR)
     90 #define inst_load(ins)		0
     91 #define inst_store(ins)		0
     92 
     93 /*
     94  * Things needed by kgdb:
     95  */
     96 typedef long kgdb_reg_t;
     97 #define KGDB_NUMREGS	(16+2)
     98 #define KGDB_BUFLEN	512
     99 
    100 
    101 #ifdef _KERNEL
    102 
    103 void	Debugger(void);		/* XXX */
    104 void	kdb_kintr(db_regs_t *);
    105 int	kdb_trap(int, db_regs_t *);
    106 
    107 #endif /* _KERNEL */
    108 
    109 /*
    110  * We use Elf32 symbols in DDB.
    111  */
    112 #define	DB_ELF_SYMBOLS
    113 
    114 #endif	/* _M68K_DB_MACHDEP_H_ */
    115