sys/cpu/i386/include/db_machdep.h

   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: src/sys/i386/include/db_machdep.h,v 1.16 1999/10/04 13:55:35 marcel Exp $
  27  * $DragonFly: src/sys/cpu/i386/include/db_machdep.h,v 1.9 2006/11/07 06:43:22 dillon Exp $
  28  */
  29
  30 #ifndef _CPU_DB_MACHDEP_H_
  31 #define _CPU_DB_MACHDEP_H_
  32
  33 #include <cpu/frame.h>
  34 #include <cpu/psl.h>
  35 #include <cpu/trap.h>
  36
  37 #define i386_saved_state trapframe
  38
  39 typedef __uint32_t      db_addr_t;      /* address - unsigned */
  40 typedef int             db_expr_t;      /* expression - signed */
  41
  42 typedef struct i386_saved_state db_regs_t;
  43
  44 #ifdef _KERNEL
  45 extern db_regs_t        ddb_regs;       /* register state */
  46 #define DDB_REGS        (&ddb_regs)
  47
  48 extern  db_addr_t       PC_REGS(db_regs_t *regs);
  49 extern  db_addr_t       SP_REGS(db_regs_t *regs);
  50 extern  db_addr_t       BP_REGS(db_regs_t *regs);
  51 #endif
  52
  53 #define BKPT_INST       0xcc            /* breakpoint instruction */
  54 #define BKPT_SIZE       (1)             /* size of breakpoint inst */
  55 #define BKPT_SET(inst)  (BKPT_INST)
  56
  57 #define FIXUP_PC_AFTER_BREAK    ddb_regs.tf_eip -= 1;
  58
  59 #define db_clear_single_step(regs)      ((regs)->tf_eflags &= ~PSL_T)
  60 #define db_set_single_step(regs)        ((regs)->tf_eflags |=  PSL_T)
  61
  62 #define IS_BREAKPOINT_TRAP(type, code)  ((type) == T_BPTFLT)
  63 /*
  64  * Watchpoints are not supported.  The debug exception type is in %dr6
  65  * and not yet in the args to this macro.
  66  */
  67 #define IS_WATCHPOINT_TRAP(type, code)  0
  68
  69 #define I_CALL          0xe8
  70 #define I_CALLI         0xff
  71 #define I_RET           0xc3
  72 #define I_IRET          0xcf
  73
  74 #define inst_trap_return(ins)   (((ins)&0xff) == I_IRET)
  75 #define inst_return(ins)        (((ins)&0xff) == I_RET)
  76 #define inst_call(ins)          (((ins)&0xff) == I_CALL || \
  77                                  (((ins)&0xff) == I_CALLI && \
  78                                   ((ins)&0x3800) == 0x1000))
  79 #define inst_load(ins)          0
  80 #define inst_store(ins)         0
  81
  82 /*
  83  * There no interesting addresses below _kstack = 0xefbfe000.  There
  84  * are small absolute values for GUPROF, but we don't want to see them.
  85  * Treat "negative" addresses below _kstack as non-small to allow for
  86  * future reductions of _kstack and to avoid sign extension problems.
  87  *
  88  * There is one interesting symbol above -db_maxoff = 0xffff0000,
  89  * namely _APTD = 0xfffff000.  Accepting this would mess up the
  90  * printing of small negative offsets.  The next largest symbol is
  91  * _APTmap = 0xffc00000.  Accepting this is OK (unless db_maxoff is
  92  * set to >= 0x400000 - (max stack offset)).
  93  */
  94 #define DB_SMALL_VALUE_MAX      0x7fffffff
  95 #define DB_SMALL_VALUE_MIN      (-0x400001)
  96
  97 #endif /* !_CPU_DB_MACHDEP_H_ */