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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9 * software, derivative works or modified versions, and any portions
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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.
16 * Carnegie Mellon requests users of this software to return to
18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
19 * School of Computer Science
20 * Carnegie Mellon University
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23 * any improvements or extensions that they make and grant Carnegie Mellon
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29 #ifndef _MACHINE_DB_MACHDEP_H_
30 #define _MACHINE_DB_MACHDEP_H_
32 #include <machine/frame.h>
33 #include <machine/trap.h>
35 typedef vm_offset_t db_addr_t; /* address - unsigned */
36 typedef long db_expr_t; /* expression - signed */
38 #define PC_REGS() ((db_addr_t)kdb_thrctx->pcb_rip)
40 #define BKPT_INST 0xcc /* breakpoint instruction */
41 #define BKPT_SIZE (1) /* size of breakpoint inst */
42 #define BKPT_SET(inst) (BKPT_INST)
46 kdb_frame->tf_rip += 1; \
47 kdb_thrctx->pcb_rip += 1; \
50 #define FIXUP_PC_AFTER_BREAK \
52 kdb_frame->tf_rip -= 1; \
53 kdb_thrctx->pcb_rip -= 1; \
56 #define db_clear_single_step kdb_cpu_clear_singlestep
57 #define db_set_single_step kdb_cpu_set_singlestep
60 * The debug exception type is copied from %dr6 to 'code' and used to
61 * disambiguate single step traps. Watchpoints have no special support.
62 * Our hardware breakpoints are not well integrated with ddb and are too
63 * different from watchpoints. ddb treats them as unknown traps with
64 * unknown addresses and doesn't turn them off while it is running.
66 #define IS_BREAKPOINT_TRAP(type, code) ((type) == T_BPTFLT)
67 #define IS_SSTEP_TRAP(type, code) ((type) == T_TRCTRAP && (code) & 0x4000)
68 #define IS_WATCHPOINT_TRAP(type, code) 0
72 #define i_calli(ins) (((ins)&0xff) == I_CALLI && ((ins)&0x3800) == 0x1000)
75 #define i_rex(ins) (((ins) & 0xff) == 0x41 || ((ins) & 0xff) == 0x43)
77 #define inst_trap_return(ins) (((ins)&0xff) == I_IRET)
78 #define inst_return(ins) (((ins)&0xff) == I_RET)
79 #define inst_call(ins) (((ins)&0xff) == I_CALL || i_calli(ins) || \
80 (i_calli((ins) >> 8) && i_rex(ins)))
81 #define inst_load(ins) 0
82 #define inst_store(ins) 0
85 * There no interesting addresses below _kstack = 0xefbfe000. There
86 * are small absolute values for GUPROF, but we don't want to see them.
87 * Treat "negative" addresses below _kstack as non-small to allow for
88 * future reductions of _kstack and to avoid sign extension problems.
90 * There is one interesting symbol above -db_maxoff = 0xffff0000,
91 * namely _APTD = 0xfffff000. Accepting this would mess up the
92 * printing of small negative offsets. The next largest symbol is
93 * _APTmap = 0xffc00000. Accepting this is OK (unless db_maxoff is
94 * set to >= 0x400000 - (max stack offset)).
96 #define DB_SMALL_VALUE_MAX 0x7fffffff
97 #define DB_SMALL_VALUE_MIN (-0x400001)
99 #endif /* !_MACHINE_DB_MACHDEP_H_ */