Qemu CPU Freeze Bug in Slackware 13 x86_64

So, I have this requirement to debug BIOS in Qemu, so I need to "freeze" the CPU on Qemu in the very first instruction. I've tried using Qemu version 0.9.x, 0.12.x and 0.13.x in Slackware 13 x86_64, passing the "-s -S" (without quote) as qemu parameter but none of them worked.

In frustration, I tried version 0.14.1 and it finally worked as expected. The following is a modified slackbuild script (originally coded by Andrew Brouwers for Slackware 13 i486) to build Qemu 0.14.1 in Slackware 13 x86_64.

#!/bin/sh

# Slackware build script for qemu

# Copyright 2009, 2010  Andrew Brouwers 
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''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 AUTHOR 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.

# Modified by the SlackBuilds.org project

PRGNAM=qemu
VERSION=0.14.1
ARCH=${ARCH:-x86_64}
BUILD=${BUILD:-1}
TAG=${TAG:-_SBo}

CWD=$(pwd)
TMP=${TMP:-/tmp/SBo}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}

if [ "$ARCH" = "i486" ]; then
  SLKCFLAGS="-O2 -march=i486 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
fi

set -e

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $PRGNAM-$VERSION
tar xvf $CWD/$PRGNAM-$VERSION.tar.gz
cd $PRGNAM-$VERSION
chown -R root:root .
chmod -R u+w,go+r-w,a-s .

# --libdir isn't recognized and isn't needed anyway
CFLAGS="$SLKCFLAGS" \
CXXFLAGS="$SLKCFLAGS" \
./configure \
  --prefix=/usr \
  --enable-system \
  --enable-user \
  --audio-drv-list=alsa,oss,sdl,esd

make OS_CFLAGS="$SLKCFLAGS"
make install DESTDIR=$PKG

find $PKG | xargs file | grep -e "executable" -e "shared object" | grep ELF \
  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true

# move any generated man pages to their proper location
if [ -d $PKG/usr/share/man ]; then
  mv $PKG/usr/share/man $PKG/usr
  gzip -9 $PKG/usr/man/man?/*.?
fi

# Add docs, and if present, built documentation to the proper location
mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cp -a TODO README LICENSE COPYING COPYING.LIB MAINTAINERS \
  $PKG/usr/doc/$PRGNAM-$VERSION
if [ -d $PKG/usr/share/doc ]; then
  mv $PKG/usr/share/doc/qemu/* $PKG/usr/doc/$PRGNAM-$VERSION/
  rm -rf $PKG/usr/share/doc
fi

cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild

mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc

cd $PKG
/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-tgz}

The changes that I made to the original slackbuild script as follows:

...
VERSION=0.14.1
ARCH=${ARCH:-x86_64}
...
./configure \
  --prefix=/usr \
  --enable-system \
  --enable-user \
  --audio-drv-list=alsa,oss,sdl,esd
...

I added "--enable-user" switch to configure script invocation.

That's it. After these changes, Qemu works as expected. I was using coreboot binary as a test case for "-s -S" Qemu parameters and it worked.

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