xref: /src/sys/arch/mips/include/db_machdep.h

/* $NetBSD: db_machdep.h,v 1.37 2021/03/29 03:09:41 simonb Exp $ */

/*
 * Copyright (c) 1997 Jonathan Stone (hereinafter referred to as the author)
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Jonathan Stone for
 *      the NetBSD Project.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
#ifndef	_MIPS_DB_MACHDEP_H_
#define	_MIPS_DB_MACHDEP_H_

#include <sys/types.h>
#include <sys/stdbool.h>

#include <uvm/uvm_param.h>		/* XXX  boolean_t */

#include <mips/trap.h>			/* T_BREAK */
#include <mips/reg.h>			/* register state */
#include <mips/regnum.h>		/* symbolic register indices */
#include <mips/pcb.h>

#define	DB_ELF_SYMBOLS

typedef	vaddr_t		db_addr_t;	/* address - unsigned */
#ifdef __mips_n32
#define	DDB_EXPR_FMT	"ll"		/* expression is long long */
typedef	int64_t		db_expr_t;	/* expression - signed */
#else
#define	DDB_EXPR_FMT	"l"		/* expression is long */
typedef	long		db_expr_t;	/* expression - signed */
#endif

typedef struct reg db_regs_t;

extern db_regs_t	ddb_regs;	/* register state */
#define	DDB_REGS	(&ddb_regs)

#define	PC_REGS(regs)	((regs)->r_regs[_R_PC])

#define	PC_ADVANCE(regs) do {						\
	if ((db_get_value((regs)->r_regs[_R_PC], sizeof(int), false) &\
	     0xfc00003f) == 0xd)					\
		(regs)->r_regs[_R_PC] += BKPT_SIZE;			\
} while(0)

/* Similar to PC_ADVANCE(), except only advance on cpu_Debugger()'s bpt */
#define	PC_BREAK_ADVANCE(regs) do {					 \
	if (db_get_value((regs)->r_regs[_R_PC], sizeof(int), false) == 0xd) \
		(regs)->r_regs[_R_PC] += BKPT_SIZE;			 \
} while(0)

#define	BKPT_ADDR(addr)	(addr)		/* breakpoint address */
#define	BKPT_INST	0x0001000D
#define	BKPT_SIZE	(4)		/* size of breakpoint inst */
#define	BKPT_SET(inst, addr)	(BKPT_INST)

#define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_BREAK)
#define	IS_WATCHPOINT_TRAP(type, code)	(0)	/* XXX mips3 watchpoint */

/*
 * Interface to disassembly (shared with mdb)
 */
db_addr_t	db_disasm_insn(int insn, db_addr_t loc, bool altfmt);

/*
 * Entrypoints to DDB for kernel, keyboard drivers, init hook
 */
void 	kdb_kbd_trap(db_regs_t *);
int 	kdb_trap(int type, struct reg *);

static inline void
db_set_ddb_regs(int type, struct reg *regs)
{
	ddb_regs = *regs;
}

/*
 * Helper functions for fetching 32-bit and 64-bit kernel memory.
 */
bool		kdbpeek(vaddr_t, unsigned *);
mips_reg_t	kdbrpeek(vaddr_t addr, size_t n);


/*
 * Constants for KGDB.
 */
typedef	mips_reg_t	kgdb_reg_t;
#define	KGDB_NUMREGS	90
#define	KGDB_BUFLEN	1024

/*
 * MIPS cpus have no hardware single-step.
 */
#define	SOFTWARE_SSTEP

#define	inst_trap_return(ins)	((ins)&0)

bool	inst_branch(int inst);
bool	inst_call(int inst);
bool	inst_return(int inst);
bool	inst_load(int inst);
bool	inst_store(int inst);
bool	inst_unconditional_flow_transfer(int inst);
db_addr_t branch_taken(int inst, db_addr_t pc, db_regs_t *regs);
db_addr_t next_instr_address(db_addr_t pc, bool bd);

bool ddb_running_on_this_cpu_p(void);
bool ddb_running_on_any_cpu_p(void);
void db_resume_others(void);
void db_mips_stack_trace(void *, void *, void (*pr)(const char *, ...));


#ifdef _KERNEL
/*
 * Optional function to perform machine- or cpu-specific reset.
 * Called from ddb "machine reset".
 */
extern void (*cpu_reset_address)(void);

/*
 * We have machine-dependent commands.
 */
#define	DB_MACHINE_COMMANDS
#endif

#define	db_stacktrace_print(prfunc) \
    db_mips_stack_trace(__builtin_return_address(0), \
	__builtin_frame_address(0), prfunc)

#endif	/* _MIPS_DB_MACHDEP_H_ */