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db_machdep.h revision 1.1 
      1 /* $NetBSD: db_machdep.h,v 1.1 2014/08/10 05:47:38 matt Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2014 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Matt Thomas of 3am Software Foundry.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _AARCH64_DB_MACHDEP_H_
     33 #define _AARCH64_DB_MACHDEP_H_
     34 
     35 #ifdef __aarch64__
     36 
     37 #include <aarch64/frame.h>
     38 
     39 typedef long long int db_expr_t;
     40 #define DDB_EXPR_FMT "llx"
     41 typedef uintptr_t db_addr_t;
     42 #define DDB_ADDR_FMT PRIxPTR
     43 
     44 #define BKPT_ADDR(addr)		(addr)
     45 #define BKPT_SIZE		4
     46 #define BKPT_INSN		0xd4200000
     47 #define	BKPT_SET(insn, addr)	(BKPT_INSN)
     48 
     49 typedef struct trapframe db_regs_t;
     50 extern db_regs_t ddb_regs;
     51 #define DDB_REGS		(&ddb_regs)
     52 #define PC_REGS(tf)		((tf)->tf_pc)
     53 
     54 #define	DB_TRAP_UNKNOWN		0
     55 #define	DB_TRAP_BREAKPOINT	1
     56 #define	DB_TRAP_BKPT_INSN	2
     57 #define	DB_TRAP_WATCHPOINT	3
     58 
     59 #define IS_BREAKPOINT_TRAP(type, code) \
     60 	((type) == DB_TRAP_BREAKPOINT || (type) == DB_TRAP_BKPT_INSN)
     61 #define IS_WATCHPOINT_TRAP(type, code) \
     62 	((type) == DB_TRAP_WATCHPOINT)
     63 
     64 static inline bool
     65 inst_call(db_expr_t insn)
     66 {
     67 	return (insn & 0xfc000000) == 0x92000000	/* bl */
     68 	    || (insn & 0xfffffcef) == 0xd63f0000;	/* blr */
     69 }
     70 
     71 static inline bool
     72 inst_load(db_expr_t insn)
     73 {
     74 	return (insn & 0x0b000000) == 0x08000000	/* ldr pc-rel */
     75 	    || (insn & 0x0b400000) == 0x08400000;
     76 }
     77 
     78 static inline bool
     79 inst_return(db_expr_t insn)
     80 {
     81 	return insn == 0xd65ffeff;			/* ret x30 */
     82 }
     83 
     84 static inline bool
     85 inst_store(db_expr_t insn)
     86 {
     87 	return (insn & 0x3b000000) != 0x18000000	/* !ldr pc-rel */
     88 	    && (insn & 0x0b400000) == 0x08000000;	/* str */
     89 }
     90 
     91 static inline bool
     92 inst_trap_return(db_expr_t insn)
     93 {
     94 	return insn == 0xd69f03e0;			/* eret */
     95 }
     96 
     97 #elif defined(__arm__)
     98 
     99 #include <arm/db_machdep.h>
    100 
    101 #endif
    102 
    103 #endif /* _AARCH64_DB_MACHDEP_H_ */
    104