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Annotation of 43BSDTahoe/man/man4/kdb.4, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1986 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)kdb.4       6.1 (Berkeley) 11/24/86
        !             6: .\"
        !             7: .TH KDB 4 "November 24, 1986"
        !             8: .UC 7
        !             9: .SH NAME
        !            10: kdb \- kernel debugging facility
        !            11: .SH SYNOPSIS
        !            12: .B "options KDB"
        !            13: .SH DESCRIPTION
        !            14: .lg
        !            15: .I Kdb
        !            16: is a debugging facility for the kernel based on
        !            17: .IR adb (1).
        !            18: .I Kdb
        !            19: may be used to symbolically examine and modify memory locations,
        !            20: set breakpoints, and single step the system.
        !            21: .PP
        !            22: Several boot time options are used in conjunction
        !            23: with the debugger.  To ``enable'' the debugger, the system
        !            24: must be booted with the RB_KDB flag (0x40) specified in the 
        !            25: .I boothowto
        !            26: register.  When the debugger is
        !            27: enabled the system will read
        !            28: in and initialize the symbol table from the booted system.
        !            29: If the RB_HALT flag (0x08) is also specified, the system will
        !            30: enter the debugger at the earliest possible time to allow
        !            31: breakpoints to be set before the system starts operation.
        !            32: From that point on, if the RB_NOSYNC flag (0x04) is set,
        !            33: typing ``^[k'', ``^[K'', or ``^[^K'' at the
        !            34: console causes a trap into the debugger.
        !            35: .PP
        !            36: .I Kdb
        !            37: supports most of the 
        !            38: .I adb
        !            39: command language.  The output formats `f', `F', `Y', are not
        !            40: supported.  The address space maps do not exist, thus the
        !            41: `/m', `?m', and `$m' commands do not exist.  Shell escapes
        !            42: and command files are not supported.  The `:r' and `:k'
        !            43: commands make no sense and are not recognized.  Finally, the
        !            44: signal arguments to the continue and single step commands are
        !            45: ignored.
        !            46: .SH NOTES
        !            47: .I Kdb
        !            48: normally runs at a priority level below the interrupt
        !            49: level of the clock and all devices; the level of the highest priority
        !            50: software interrupt.  If the debugger is entered on the kernel's
        !            51: per-process stack at an ipl below its normal operating level it
        !            52: automatically switches to the interrupt stack to avoid potential
        !            53: overflow of the kernel stack.  Should the debugger operate on
        !            54: the kernel stack the message ``(on kernel stack)'' will be printed
        !            55: on entry.
        !            56: .PP
        !            57: Note also that because
        !            58: .I kdb
        !            59: use input from the console to force entry to the debugger it may
        !            60: not be possible to force entry if the system hangs at a priority
        !            61: level higher than the console receiver interrupt.
        !            62: .SH "SEE ALSO"
        !            63: adb(1)

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