FreeBSD/Linux Kernel Cross Reference
sys/i386/include/db_machdep.h

     /*
      * Mach Operating System
      * Copyright (c) 1991,1990 Carnegie Mellon University
      * All Rights Reserved.
      *
      * Permission to use, copy, modify and distribute this software and its
      * documentation is hereby granted, provided that both the copyright
      * notice and this permission notice appear in all copies of the
      * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     *
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     *
     * Carnegie Mellon requests users of this software to return to
     *
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     *
     * any improvements or extensions that they make and grant Carnegie Mellon
     * the rights to redistribute these changes.
     *
     * $FreeBSD: releng/5.0/sys/i386/include/db_machdep.h 83506 2001-09-15 11:06:07Z dfr $
     */
    
    #ifndef _MACHINE_DB_MACHDEP_H_
    #define _MACHINE_DB_MACHDEP_H_
    
    #include <machine/frame.h>
    #include <machine/psl.h>
    #include <machine/trap.h>
    
    #define i386_saved_state trapframe
    
    typedef vm_offset_t     db_addr_t;      /* address - unsigned */
    typedef int             db_expr_t;      /* expression - signed */
    
    typedef struct i386_saved_state db_regs_t;
    extern db_regs_t        ddb_regs;       /* register state */
    #define DDB_REGS        (&ddb_regs)
    
    #define PC_REGS(regs)   ((db_addr_t)(regs)->tf_eip)
    
    #define BKPT_INST       0xcc            /* breakpoint instruction */
    #define BKPT_SIZE       (1)             /* size of breakpoint inst */
    #define BKPT_SET(inst)  (BKPT_INST)
    
    #define BKPT_SKIP               ddb_regs.tf_eip += 1
    
    #define FIXUP_PC_AFTER_BREAK    ddb_regs.tf_eip -= 1;
    
    #define db_clear_single_step(regs)      ((regs)->tf_eflags &= ~PSL_T)
    #define db_set_single_step(regs)        ((regs)->tf_eflags |=  PSL_T)
    
    #define IS_BREAKPOINT_TRAP(type, code)  ((type) == T_BPTFLT)
    /*
     * Watchpoints are not supported.  The debug exception type is in %dr6
     * and not yet in the args to this macro.
     */
    #define IS_WATCHPOINT_TRAP(type, code)  0
    
    #define I_CALL          0xe8
    #define I_CALLI         0xff
    #define I_RET           0xc3
    #define I_IRET          0xcf
    
    #define inst_trap_return(ins)   (((ins)&0xff) == I_IRET)
    #define inst_return(ins)        (((ins)&0xff) == I_RET)
    #define inst_call(ins)          (((ins)&0xff) == I_CALL || \
                                     (((ins)&0xff) == I_CALLI && \
                                      ((ins)&0x3800) == 0x1000))
    #define inst_load(ins)          0
    #define inst_store(ins)         0
    
    /*
     * There no interesting addresses below _kstack = 0xefbfe000.  There
     * are small absolute values for GUPROF, but we don't want to see them.
     * Treat "negative" addresses below _kstack as non-small to allow for
     * future reductions of _kstack and to avoid sign extension problems.
     *
     * There is one interesting symbol above -db_maxoff = 0xffff0000,
     * namely _APTD = 0xfffff000.  Accepting this would mess up the
     * printing of small negative offsets.  The next largest symbol is
     * _APTmap = 0xffc00000.  Accepting this is OK (unless db_maxoff is
     * set to >= 0x400000 - (max stack offset)).
     */
    #define DB_SMALL_VALUE_MAX      0x7fffffff
    #define DB_SMALL_VALUE_MIN      (-0x400001)
    
    #endif /* !_MACHINE_DB_MACHDEP_H_ */

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