# $NetBSD: stack,v 1.4 2023/08/01 21:26:27 andvar 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 interpreted 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
