808cf02c24
db_segsize(). Use db_segsize() to set the default operand/address size for disassembling. Allow overriding this with the "alternate" display format /I. The API of db_disasm() should be debooleanized to pass a more general request (amd64 needs overrides to sizes of 16, 32, and 64, but this commit doesn't implement anything for amd64 since much larger changes are needed to restore the amd64 disassmbler's support for non-default sizes). Fix db_print_loc_and_inst() to ask for the normal format and not the alternate in normal operation. This is most useful for vm86 mode, but also works for 16-bit protected mode. Use db_segsize() to avoid trying to print a garbage stack trace if %cs is 16 bits. Print something like the stack trace termination message for a trap boundary instead. Document that the alternate format is now useful on i386.
104 lines
3.5 KiB
C
104 lines
3.5 KiB
C
/*-
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* Mach Operating System
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* Copyright (c) 1991,1990 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_DB_MACHDEP_H_
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#define _MACHINE_DB_MACHDEP_H_
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#include <machine/frame.h>
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#include <machine/trap.h>
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typedef vm_offset_t db_addr_t; /* address - unsigned */
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typedef int db_expr_t; /* expression - signed */
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#define PC_REGS() ((db_addr_t)(kdb_frame->tf_eflags & PSL_VM ? \
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(kdb_frame->tf_eip & 0xffff) + \
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((kdb_frame->tf_cs & 0xffff) << 4) : \
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kdb_frame->tf_eip))
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#define BKPT_INST 0xcc /* breakpoint instruction */
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#define BKPT_SIZE (1) /* size of breakpoint inst */
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#define BKPT_SET(inst) (BKPT_INST)
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#define BKPT_SKIP \
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do { \
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kdb_frame->tf_eip += 1; \
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kdb_thrctx->pcb_eip += 1; \
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} while(0)
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#define FIXUP_PC_AFTER_BREAK \
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do { \
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kdb_frame->tf_eip -= 1; \
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kdb_thrctx->pcb_eip -= 1; \
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} while(0);
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#define db_clear_single_step kdb_cpu_clear_singlestep
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#define db_set_single_step kdb_cpu_set_singlestep
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/*
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* The debug exception type is copied from %dr6 to 'code' and used to
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* disambiguate single step traps. Watchpoints have no special support.
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* Our hardware breakpoints are not well integrated with ddb and are too
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* different from watchpoints. ddb treats them as unknown traps with
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* unknown addresses and doesn't turn them off while it is running.
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*/
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#define IS_BREAKPOINT_TRAP(type, code) ((type) == T_BPTFLT)
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#define IS_SSTEP_TRAP(type, code) ((type) == T_TRCTRAP && (code) & 0x4000)
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#define IS_WATCHPOINT_TRAP(type, code) 0
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#define I_CALL 0xe8
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#define I_CALLI 0xff
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#define I_RET 0xc3
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#define I_IRET 0xcf
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#define inst_trap_return(ins) (((ins)&0xff) == I_IRET)
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#define inst_return(ins) (((ins)&0xff) == I_RET)
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#define inst_call(ins) (((ins)&0xff) == I_CALL || \
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(((ins)&0xff) == I_CALLI && \
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((ins)&0x3800) == 0x1000))
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#define inst_load(ins) 0
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#define inst_store(ins) 0
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/*
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* There no interesting addresses below _kstack = 0xefbfe000. There
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* are small absolute values for GUPROF, but we don't want to see them.
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* Treat "negative" addresses below _kstack as non-small to allow for
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* future reductions of _kstack and to avoid sign extension problems.
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*
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* There is one interesting symbol above -db_maxoff = 0xffff0000,
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* namely _APTD = 0xfffff000. Accepting this would mess up the
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* printing of small negative offsets. The next largest symbol is
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* _APTmap = 0xffc00000. Accepting this is OK (unless db_maxoff is
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* set to >= 0x400000 - (max stack offset)).
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*/
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#define DB_SMALL_VALUE_MAX 0x7fffffff
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#define DB_SMALL_VALUE_MIN (-0x400001)
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int db_segsize(struct trapframe *tfp);
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#endif /* !_MACHINE_DB_MACHDEP_H_ */
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