The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/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: releng/6.4/sys/i386/include/db_machdep.h 139790 2005-01-06 22:18:23Z imp $
   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 int             db_expr_t;      /* expression - signed */
   37 
   38 #define PC_REGS()       ((db_addr_t)kdb_thrctx->pcb_eip)
   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_eip += 1;                 \
   47         kdb_thrctx->pcb_eip += 1;               \
   48 } while(0)
   49 
   50 #define FIXUP_PC_AFTER_BREAK                    \
   51 do {                                            \
   52         kdb_frame->tf_eip -= 1;                 \
   53         kdb_thrctx->pcb_eip -= 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 #define IS_BREAKPOINT_TRAP(type, code)  ((type) == T_BPTFLT)
   60 /*
   61  * Watchpoints are not supported.  The debug exception type is in %dr6
   62  * and not yet in the args to this macro.
   63  */
   64 #define IS_WATCHPOINT_TRAP(type, code)  0
   65 
   66 #define I_CALL          0xe8
   67 #define I_CALLI         0xff
   68 #define I_RET           0xc3
   69 #define I_IRET          0xcf
   70 
   71 #define inst_trap_return(ins)   (((ins)&0xff) == I_IRET)
   72 #define inst_return(ins)        (((ins)&0xff) == I_RET)
   73 #define inst_call(ins)          (((ins)&0xff) == I_CALL || \
   74                                  (((ins)&0xff) == I_CALLI && \
   75                                   ((ins)&0x3800) == 0x1000))
   76 #define inst_load(ins)          0
   77 #define inst_store(ins)         0
   78 
   79 /*
   80  * There no interesting addresses below _kstack = 0xefbfe000.  There
   81  * are small absolute values for GUPROF, but we don't want to see them.
   82  * Treat "negative" addresses below _kstack as non-small to allow for
   83  * future reductions of _kstack and to avoid sign extension problems.
   84  *
   85  * There is one interesting symbol above -db_maxoff = 0xffff0000,
   86  * namely _APTD = 0xfffff000.  Accepting this would mess up the
   87  * printing of small negative offsets.  The next largest symbol is
   88  * _APTmap = 0xffc00000.  Accepting this is OK (unless db_maxoff is
   89  * set to >= 0x400000 - (max stack offset)).
   90  */
   91 #define DB_SMALL_VALUE_MAX      0x7fffffff
   92 #define DB_SMALL_VALUE_MIN      (-0x400001)
   93 
   94 #endif /* !_MACHINE_DB_MACHDEP_H_ */

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