db_machdep.h

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    1 /*-
    2  * Mach Operating System
    3  * Copyright (c) 1991,1990 Carnegie Mellon University
    4  * All Rights Reserved.
    5  *
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  *
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  *
   16  * Carnegie Mellon requests users of this software to return to
   17  *
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  *
   23  * any improvements or extensions that they make and grant Carnegie Mellon
   24  * the rights to redistribute these changes.
   25  *
   26  * $FreeBSD$
   27  */
   28 
   29 #ifndef _MACHINE_DB_MACHDEP_H_
   30 #define _MACHINE_DB_MACHDEP_H_
   31 
   32 #include <machine/frame.h>
   33 #include <machine/trap.h>
   34 
   35 typedef vm_offset_t     db_addr_t;      /* address - unsigned */
   36 typedef long            db_expr_t;      /* expression - signed */
   37 
   38 #define PC_REGS()       ((db_addr_t)kdb_thrctx->pcb_rip)
   39 
   40 #define BKPT_INST       0xcc            /* breakpoint instruction */
   41 #define BKPT_SIZE       (1)             /* size of breakpoint inst */
   42 #define BKPT_SET(inst)  (BKPT_INST)
   43 
   44 #define BKPT_SKIP                               \
   45 do {                                            \
   46         kdb_frame->tf_rip += 1;                 \
   47         kdb_thrctx->pcb_rip += 1;               \
   48 } while(0)
   49 
   50 #define FIXUP_PC_AFTER_BREAK                    \
   51 do {                                            \
   52         kdb_frame->tf_rip -= 1;                 \
   53         kdb_thrctx->pcb_rip -= 1;               \
   54 } while(0);
   55 
   56 #define db_clear_single_step    kdb_cpu_clear_singlestep
   57 #define db_set_single_step      kdb_cpu_set_singlestep
   58 
   59 /*
   60  * The debug exception type is copied from %dr6 to 'code' and used to
   61  * disambiguate single step traps.  Watchpoints have no special support.
   62  * Our hardware breakpoints are not well integrated with ddb and are too
   63  * different from watchpoints.  ddb treats them as unknown traps with
   64  * unknown addresses and doesn't turn them off while it is running.
   65  */
   66 #define IS_BREAKPOINT_TRAP(type, code)  ((type) == T_BPTFLT)
   67 #define IS_SSTEP_TRAP(type, code)                                       \
   68         ((type) == T_TRCTRAP && (code) & DBREG_DR6_BS)
   69 #define IS_WATCHPOINT_TRAP(type, code)  0
   70 
   71 #define I_CALL          0xe8
   72 #define I_CALLI         0xff
   73 #define i_calli(ins)    (((ins)&0xff) == I_CALLI && ((ins)&0x3800) == 0x1000)
   74 #define I_RET           0xc3
   75 #define I_IRET          0xcf
   76 #define i_rex(ins)      (((ins) & 0xff) == 0x41 || ((ins) & 0xff) == 0x43)
   77 
   78 #define inst_trap_return(ins)   (((ins)&0xff) == I_IRET)
   79 #define inst_return(ins)        (((ins)&0xff) == I_RET)
   80 #define inst_call(ins)          (((ins)&0xff) == I_CALL || i_calli(ins) || \
   81                                  (i_calli((ins) >> 8) && i_rex(ins)))
   82 #define inst_load(ins)          0
   83 #define inst_store(ins)         0
   84 
   85 #endif /* !_MACHINE_DB_MACHDEP_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/amd64/include/db_machdep.h

FreeBSD/Linux Kernel Cross Reference
sys/amd64/include/db_machdep.h