2 * Mach Operating System
3 * Copyright (c) 1991,1990 Carnegie Mellon University
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7 * documentation is hereby granted, provided that both the copyright
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19 * School of Computer Science
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26 * $FreeBSD: src/sys/i386/include/db_machdep.h,v 1.16 1999/10/04 13:55:35 marcel Exp $
27 * $DragonFly: src/sys/i386/include/Attic/db_machdep.h,v 1.7 2003/11/15 21:05:43 dillon Exp $
30 #ifndef _MACHINE_DB_MACHDEP_H_
31 #define _MACHINE_DB_MACHDEP_H_
36 #include "globaldata.h"
38 #define i386_saved_state trapframe
40 typedef __uint32_t db_addr_t; /* address - unsigned */
41 typedef int db_expr_t; /* expression - signed */
43 typedef struct i386_saved_state db_regs_t;
46 extern db_regs_t ddb_regs; /* register state */
47 #define DDB_REGS (&ddb_regs)
49 extern db_addr_t PC_REGS(db_regs_t *regs);
50 extern db_addr_t SP_REGS(db_regs_t *regs);
51 extern db_addr_t BP_REGS(db_regs_t *regs);
54 #define BKPT_INST 0xcc /* breakpoint instruction */
55 #define BKPT_SIZE (1) /* size of breakpoint inst */
56 #define BKPT_SET(inst) (BKPT_INST)
58 #define FIXUP_PC_AFTER_BREAK ddb_regs.tf_eip -= 1;
60 #define db_clear_single_step(regs) ((regs)->tf_eflags &= ~PSL_T)
61 #define db_set_single_step(regs) ((regs)->tf_eflags |= PSL_T)
63 #define IS_BREAKPOINT_TRAP(type, code) ((type) == T_BPTFLT)
65 * Watchpoints are not supported. The debug exception type is in %dr6
66 * and not yet in the args to this macro.
68 #define IS_WATCHPOINT_TRAP(type, code) 0
75 #define inst_trap_return(ins) (((ins)&0xff) == I_IRET)
76 #define inst_return(ins) (((ins)&0xff) == I_RET)
77 #define inst_call(ins) (((ins)&0xff) == I_CALL || \
78 (((ins)&0xff) == I_CALLI && \
79 ((ins)&0x3800) == 0x1000))
80 #define inst_load(ins) 0
81 #define inst_store(ins) 0
84 * There no interesting addresses below _kstack = 0xefbfe000. There
85 * are small absolute values for GUPROF, but we don't want to see them.
86 * Treat "negative" addresses below _kstack as non-small to allow for
87 * future reductions of _kstack and to avoid sign extension problems.
89 * There is one interesting symbol above -db_maxoff = 0xffff0000,
90 * namely _APTD = 0xfffff000. Accepting this would mess up the
91 * printing of small negative offsets. The next largest symbol is
92 * _APTmap = 0xffc00000. Accepting this is OK (unless db_maxoff is
93 * set to >= 0x400000 - (max stack offset)).
95 #define DB_SMALL_VALUE_MAX 0x7fffffff
96 #define DB_SMALL_VALUE_MIN (-0x400001)
98 #endif /* !_MACHINE_DB_MACHDEP_H_ */