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db_machdep.h revision 1.4 
      1 /* $NetBSD: db_machdep.h,v 1.4 2021/05/18 06:40:16 skrll 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	_RISCV_DB_MACHDEP_H_
     33 #define	_RISCV_DB_MACHDEP_H_
     34 
     35 #include <riscv/locore.h>		/* T_BREAK */
     36 
     37 #define	DB_ELF_SYMBOLS
     38 
     39 typedef	vaddr_t		db_addr_t;	/* address - unsigned */
     40 #define	DDB_EXPR_FMT	"l"		/* expression is long */
     41 typedef	long		db_expr_t;	/* expression - signed */
     42 
     43 typedef struct trapframe db_regs_t;
     44 
     45 extern const uint32_t __cpu_Debugger_insn[1];
     46 #define	DDB_REGS	(curcpu()->ci_ddb_regs)
     47 
     48 #define	PC_REGS(tf)	((tf)->tf_pc)
     49 
     50 #define PC_ADVANCE(tf) do {						\
     51 	if (db_get_value((tf)->tf_pc, sizeof(uint32_t), false) == BKPT_INST) \
     52 		(tf)->tf_pc += BKPT_SIZE;			\
     53 } while(0)
     54 
     55 /* Similar to PC_ADVANCE(), except only advance on cpu_Debugger()'s bpt */
     56 #define PC_BREAK_ADVANCE(tf) do {				\
     57 	if ((tf)->tf_pc == (register_t) __cpu_Debugger_insn)	\
     58 		(tf)->tf_pc += BKPT_SIZE;			\
     59 } while(0)
     60 
     61 #define	BKPT_ADDR(addr)		(addr)			/* breakpoint address */
     62 #define BKPT_INST		0x00100073
     63 #define	BKPT_SIZE		(sizeof(uint32_t))	/* size of bkpt inst */
     64 #define	BKPT_SET(inst, addr)	(BKPT_INST)
     65 
     66 /*
     67  * XXX with the C extension there's also a 16-bit-wide breakpoint
     68  * instruction, the idea being that you use it when inserting a
     69  * breakpoint into a stream of 16-bit instructions, but it looks like
     70  * MI ddb can't cope with having two sizes :-(
     71  */
     72 #if 0
     73 #define BKPT_INST_2	0x9002
     74 #define BKPT_SIZE_2	(sizeof(uint16_t))
     75 #endif
     76 
     77 #define	IS_BREAKPOINT_TRAP(type, code)	((type) == CAUSE_BREAKPOINT)
     78 #define IS_WATCHPOINT_TRAP(type, code)	(0)
     79 
     80 /*
     81  * Interface to disassembly
     82  */
     83 db_addr_t	db_disasm_insn(uint32_t, db_addr_t, bool);
     84 
     85 
     86 /*
     87  * Entrypoints to DDB for kernel, keyboard drivers, init hook
     88  */
     89 void 	kdb_kbd_trap(db_regs_t *);
     90 int 	kdb_trap(int, struct trapframe *);
     91 
     92 static inline void
     93 db_set_ddb_regs(int type, struct trapframe *tf)
     94 {
     95 	*curcpu()->ci_ddb_regs = *tf;
     96 }
     97 
     98 
     99 /*
    100  * Constants for KGDB.
    101  */
    102 typedef	register_t	kgdb_reg_t;
    103 #define	KGDB_NUMREGS	90
    104 #define	KGDB_BUFLEN	1024
    105 
    106 /*
    107  * RISCV cpus have no hardware single-step.
    108  */
    109 #define SOFTWARE_SSTEP
    110 
    111 #define inst_trap_return(ins)	((ins)&0)
    112 
    113 bool	inst_branch(uint32_t inst);
    114 bool	inst_call(uint32_t inst);
    115 bool	inst_return(uint32_t inst);
    116 bool	inst_load(uint32_t inst);
    117 bool	inst_store(uint32_t inst);
    118 bool	inst_unconditional_flow_transfer(uint32_t inst);
    119 db_addr_t branch_taken(uint32_t inst, db_addr_t pc, db_regs_t *regs);
    120 db_addr_t next_instr_address(db_addr_t pc, bool bd);
    121 
    122 bool ddb_running_on_this_cpu_p(void);
    123 bool ddb_running_on_any_cpu_p(void);
    124 void db_resume_others(void);
    125 
    126 #if 0
    127 /*
    128  * We have machine-dependent commands.
    129  */
    130 #define DB_MACHINE_COMMANDS
    131 #endif
    132 
    133 #endif	/* _RISCV_DB_MACHDEP_H_ */
    134