# $NetBSD: stack,v 1.3 2008/04/28 20:23:23 martin Exp $

# Copyright (c) 2000 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by John A. Hawkinson.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.


# Follow an i386 kernel stack trace.
# This code makes presumptions about the way frames look, consistent
# with arch/i386/i386/db_trace.c. It also steals algorithms from there.

# Output looks like:
#
#  0xc03049cb <cpu_reboot+99>(0x100,0x0,0xc04fd728,0x0,0x6)
#	      at 0xc01bc97d <panic+197> (frame at 0xc5633bd0)
#
# In this case, the initial hex number and offset should be disregarded,
# and it should be interprted as if it were:
#
#  cpu_reboot(0x100,0x0,0xc04fd728,0x0,0x6)
#	      at 0xc01bc97d <panic+197> (frame at 0xc5633bd0)
#
# due to limitations of gdb scripting.

define stacktrace
  set $frame=$arg0
  set $retaddr=$arg1

  while ($frame != 0)
    set $callpc = $retaddr
    set $retaddr = *(long*)($frame+sizeof(long*))

    set $inst=*(long*)$retaddr
    if (($inst & 0xff) == 0x59)
# (popl %ecx)
	set $narg=1
    else if (($inst & 0xffff) == 0xc483)
# (addl %n, %esp)
	   set $narg = (($inst >> 16) & 0xff) / 4
         else
	   set $narg = 5
    end

    set $argp = $frame+sizeof(long*)+sizeof(int)
    printf "  "
    output/a $callpc
    printf "("
    while ($narg != 0)
      printf "0x%lx", *(long*)$argp
      set $argp = $argp+sizeof(long*)
      set $narg = $narg-1
      if ($narg != 0)
	printf ","
      end
    end
    printf ")\n             at "
    output/a $retaddr
    printf " (frame at %#x)\n", $frame

    set $frame=*(long*)$frame
  end
end

document stacktrace
  ==> (gdb) stacktrace FP IP
  print a backtrace of all stack frames, starting at frame pointer FP,
  and instruction pointer IP.
end

define stack
  stacktrace $ebp $eip
end

document stack
  => (gdb) stack
  Print a backtrace of all strack frames, starting at the current $ebp
  and $eip.
end