xref: /freebsd/sys/riscv/include/gdb_machdep.h (revision 4d846d260e2b9a3d4d0a701462568268cbfe7a5b)

/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2021 Mitchell Horne <mhorne@FreeBSD.org>
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 _MACHINE_GDB_MACHDEP_H_
#define	_MACHINE_GDB_MACHDEP_H_

#define	GDB_BUFSZ		4096
#define	GDB_NREGS		33
#define	GDB_REG_ZERO		0
#define	GDB_REG_RA		1
#define	GDB_REG_SP		2
#define	GDB_REG_GP		3
#define	GDB_REG_TP		4
#define	GDB_REG_T0		5
#define	GDB_REG_FP		8
#define	GDB_REG_S1		9
#define	GDB_REG_A0		10
#define	GDB_REG_S2		18
#define	GDB_REG_T3		28
#define	GDB_REG_PC		32
#define	GDB_REG_CSR_BASE	65
#define	GDB_REG_SSTATUS		(GDB_REG_CSR_BASE + 0x100)
#define	GDB_REG_SCAUSE		(GDB_REG_CSR_BASE + 0x142)
#define	GDB_REG_STVAL		(GDB_REG_CSR_BASE + 0x143)
_Static_assert(GDB_BUFSZ >= (GDB_NREGS * 8), "buffer fits 'g' regs");

static __inline size_t
gdb_cpu_regsz(int regnum __unused)
{

	return (8);
}

static __inline int
gdb_cpu_query(void)
{
	return (0);
}

static __inline void *
gdb_begin_write(void)
{

	return (NULL);
}

static __inline void
gdb_end_write(void *arg __unused)
{

}

static __inline void
gdb_cpu_stop_reason(int type __unused, int code __unused)
{

}

void	*gdb_cpu_getreg(int, size_t *);
void	 gdb_cpu_setreg(int, void *);
int	 gdb_cpu_signal(int, int);

#endif /* !_MACHINE_GDB_MACHDEP_H_ */