FreeBSD/Linux Kernel Cross Reference
sys/riscv/include/db_machdep.h

     /*-
      * Copyright (c) 2015-2016 Ruslan Bukin <br@bsdpad.com>
      * All rights reserved.
      *
      * Portions of this software were developed by SRI International and the
      * University of Cambridge Computer Laboratory under DARPA/AFRL contract
      * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
      *
      * Portions of this software were developed by the University of Cambridge
     * Computer Laboratory as part of the CTSRD Project, with support from the
     * UK Higher Education Innovation Fund (HEIF).
     *
     * 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.
     *
     * $FreeBSD: releng/11.0/sys/riscv/include/db_machdep.h 296614 2016-03-10 15:51:43Z br $
     */
    
    #ifndef _MACHINE_DB_MACHDEP_H_
    #define _MACHINE_DB_MACHDEP_H_
    
    #include <machine/riscvreg.h>
    #include <machine/frame.h>
    #include <machine/trap.h>
    
    #define T_BREAKPOINT    (EXCP_INSTR_BREAKPOINT)
    #define T_WATCHPOINT    (0)
    
    typedef vm_offset_t     db_addr_t;
    typedef long            db_expr_t;
    
    #define PC_REGS()       ((db_addr_t)kdb_thrctx->pcb_sepc)
    
    #define BKPT_INST       (0x00100073)
    #define BKPT_SIZE       (INSN_SIZE)
    #define BKPT_SET(inst)  (BKPT_INST)
    
    #define BKPT_SKIP do {                          \
            kdb_frame->tf_sepc += BKPT_SIZE;        \
    } while (0)
    
    #define db_clear_single_step    kdb_cpu_clear_singlestep
    #define db_set_single_step      kdb_cpu_set_singlestep
    
    #define IS_BREAKPOINT_TRAP(type, code)  (type == T_BREAKPOINT)
    #define IS_WATCHPOINT_TRAP(type, code)  (type == T_WATCHPOINT)
    
    #define inst_trap_return(ins)   (ins == 0x10000073)     /* eret */
    #define inst_return(ins)        (ins == 0x00008067)     /* ret */
    #define inst_call(ins)          (((ins) & 0x7f) == 111 || \
                                     ((ins) & 0x7f) == 103) /* jal, jalr */
    
    #define inst_load(ins) ({                                                       \
            uint32_t tmp_instr = db_get_value(PC_REGS(), sizeof(uint32_t), FALSE);  \
            is_load_instr(tmp_instr);                                               \
    })
    
    #define inst_store(ins) ({                                                      \
            uint32_t tmp_instr = db_get_value(PC_REGS(), sizeof(uint32_t), FALSE);  \
            is_store_instr(tmp_instr);                                              \
    })
    
    #define is_load_instr(ins)      (((ins) & 0x7f) == 3)
    #define is_store_instr(ins)     (((ins) & 0x7f) == 35)
    
    #define next_instr_address(pc, bd)      ((bd) ? (pc) : ((pc) + 4))
    
    #define DB_SMALL_VALUE_MAX      (0x7fffffff)
    #define DB_SMALL_VALUE_MIN      (-0x40001)
    
    #define DB_ELFSIZE              64
    
    #endif /* !_MACHINE_DB_MACHDEP_H_ */

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