sys/arch/mips/include/db_machdep.h

   1 /* $NetBSD: db_machdep.h,v 1.21 2007/02/22 05:28:53 matt Exp $ */
   2
   3 /*
   4  * Copyright (c) 1997 Jonathan Stone (hereinafter referred to as the author)
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by Jonathan Stone for
  18  *      the NetBSD Project.
  19  * 4. The name of the author may not be used to endorse or promote products
  20  *    derived from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34 #ifndef _MIPS_DB_MACHDEP_H_
  35 #define _MIPS_DB_MACHDEP_H_
  36
  37 #include <uvm/uvm_param.h>              /* XXX  boolean_t */
  38 #include <mips/trap.h>                  /* T_BREAK */
  39 #include <mips/reg.h>                   /* register state */
  40 #include <mips/regnum.h>                /* symbolic register indices */
  41 #include <mips/proc.h>                  /* register state */
  42
  43
  44 typedef vaddr_t         db_addr_t;      /* address - unsigned */
  45 typedef long            db_expr_t;      /* expression - signed */
  46
  47 typedef struct frame db_regs_t;
  48
  49 extern db_regs_t        ddb_regs;       /* register state */
  50 #define DDB_REGS        (&ddb_regs)
  51
  52 #define PC_REGS(regs)   ((regs)->f_regs[_R_PC])
  53
  54 #define PC_ADVANCE(regs) do {                                           \
  55         if ((db_get_value((regs)->f_regs[_R_PC], sizeof(int), false) &\
  56              0xfc00003f) == 0xd)                                        \
  57                 (regs)->f_regs[_R_PC] += BKPT_SIZE;                     \
  58 } while(0)
  59
  60 /* Similar to PC_ADVANCE(), except only advance on cpu_Debugger()'s bpt */
  61 #define PC_BREAK_ADVANCE(regs) do {                                      \
  62         if (db_get_value((regs)->f_regs[_R_PC], sizeof(int), false) == 0xd) \
  63                 (regs)->f_regs[_R_PC] += BKPT_SIZE;                      \
  64 } while(0)
  65
  66 #define BKPT_ADDR(addr) (addr)          /* breakpoint address */
  67 #define BKPT_INST       0x0001000D
  68 #define BKPT_SIZE       (4)             /* size of breakpoint inst */
  69 #define BKPT_SET(inst, addr)    (BKPT_INST)
  70
  71 #define IS_BREAKPOINT_TRAP(type, code)  ((type) == T_BREAK)
  72 #define IS_WATCHPOINT_TRAP(type, code)  (0)     /* XXX mips3 watchpoint */
  73
  74 /*
  75  * Interface to  disassembly (shared with mdb)
  76  */
  77 db_addr_t       db_disasm_insn(int insn, db_addr_t loc, bool altfmt);
  78
  79
  80 /*
  81  * Entrypoints to DDB for kernel, keyboard drivers, init hook
  82  */
  83 void    kdb_kbd_trap(db_regs_t *);
  84 void    db_set_ddb_regs(int type, mips_reg_t *);
  85 int     kdb_trap(int type, mips_reg_t *);
  86
  87
  88 /*
  89  * Constants for KGDB.
  90  */
  91 typedef mips_reg_t      kgdb_reg_t;
  92 #define KGDB_NUMREGS    90
  93 #define KGDB_BUFLEN     1024
  94
  95 /*
  96  * MIPS cpus have no hardware single-step.
  97  */
  98 #define SOFTWARE_SSTEP
  99
 100 #define inst_trap_return(ins)   ((ins)&0)
 101
 102 bool    inst_branch(int inst);
 103 bool    inst_call(int inst);
 104 bool    inst_return(int inst);
 105 bool    inst_load(int inst);
 106 bool    inst_store(int inst);
 107 bool    inst_unconditional_flow_transfer(int inst);
 108 db_addr_t branch_taken(int inst, db_addr_t pc, db_regs_t *regs);
 109 db_addr_t next_instr_address(db_addr_t pc, bool bd);
 110
 111 /*
 112  * We have machine-dependent commands.
 113  */
 114 #define DB_MACHINE_COMMANDS
 115
 116 #endif  /* _MIPS_DB_MACHDEP_H_ */