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: head/sys/i386/include/db_machdep.h 334009 2018-05-22 00:45:00Z jhb $
   27  */
   28 
   29 #ifndef _MACHINE_DB_MACHDEP_H_
   30 #define _MACHINE_DB_MACHDEP_H_
   31 
   32 #include <machine/frame.h>
   33 #include <machine/reg.h>
   34 #include <machine/trap.h>
   35 
   36 typedef vm_offset_t     db_addr_t;      /* address - unsigned */
   37 typedef int             db_expr_t;      /* expression - signed */
   38 
   39 #define PC_REGS()       ((db_addr_t)(kdb_frame->tf_eflags & PSL_VM ?    \
   40                             (kdb_frame->tf_eip & 0xffff) +              \
   41                             ((kdb_frame->tf_cs & 0xffff) << 4) :        \
   42                             kdb_frame->tf_eip))
   43 
   44 #define BKPT_INST       0xcc            /* breakpoint instruction */
   45 #define BKPT_SIZE       (1)             /* size of breakpoint inst */
   46 #define BKPT_SET(inst)  (BKPT_INST)
   47 
   48 #define BKPT_SKIP                               \
   49 do {                                            \
   50         kdb_frame->tf_eip += 1;                 \
   51         kdb_thrctx->pcb_eip += 1;               \
   52 } while(0)
   53 
   54 #define FIXUP_PC_AFTER_BREAK                    \
   55 do {                                            \
   56         kdb_frame->tf_eip -= 1;                 \
   57         kdb_thrctx->pcb_eip -= 1;               \
   58 } while(0);
   59 
   60 #define db_clear_single_step    kdb_cpu_clear_singlestep
   61 #define db_set_single_step      kdb_cpu_set_singlestep
   62 
   63 /*
   64  * The debug exception type is copied from %dr6 to 'code' and used to
   65  * disambiguate single step traps.  Watchpoints have no special support.
   66  * Our hardware breakpoints are not well integrated with ddb and are too
   67  * different from watchpoints.  ddb treats them as unknown traps with
   68  * unknown addresses and doesn't turn them off while it is running.
   69  */
   70 #define IS_BREAKPOINT_TRAP(type, code)  ((type) == T_BPTFLT)
   71 #define IS_SSTEP_TRAP(type, code)                                       \
   72         ((type) == T_TRCTRAP && (code) & DBREG_DR6_BS)
   73 #define IS_WATCHPOINT_TRAP(type, code)  0
   74 
   75 #define I_CALL          0xe8
   76 #define I_CALLI         0xff
   77 #define I_RET           0xc3
   78 #define I_IRET          0xcf
   79 
   80 #define inst_trap_return(ins)   (((ins)&0xff) == I_IRET)
   81 #define inst_return(ins)        (((ins)&0xff) == I_RET)
   82 #define inst_call(ins)          (((ins)&0xff) == I_CALL || \
   83                                  (((ins)&0xff) == I_CALLI && \
   84                                   ((ins)&0x3800) == 0x1000))
   85 #define inst_load(ins)          0
   86 #define inst_store(ins)         0
   87 
   88 int     db_segsize(struct trapframe *tfp);
   89 
   90 #endif /* !_MACHINE_DB_MACHDEP_H_ */

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