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#!/usr/bin/env bash
MYDIR=$(dirname $0)
mkdir -p ${MYDIR}/.bins
DEFAULT_BASEROM=baserom.nds
DEFAULT_ARM9BUILDDIR=build/heartgold.us
DEFAULT_ARM7BUILDDIR=sub/build
DEFAULT_FSDIR=files
# Build C utils on demand
[[ $MYDIR/ntruncompbw -nt $MYDIR/ntruncompbw.c ]] || gcc -O3 -g -o $MYDIR/ntruncompbw $MYDIR/ntruncompbw.c
[[ $MYDIR/ntrextractfile -nt $MYDIR/ntrextractfile.c ]] || gcc -O3 -g -o $MYDIR/ntrextractfile $MYDIR/ntrextractfile.c
getword() {
od -j "$2" -N 4 -A n -t u "$1" | awk '{$1=$1};1'
}
[[ -n "$DEVKITARM" ]] && export PATH=${DEVKITARM}/bin:${PATH}
POSITIONAL=()
usage () {
echo "Diff segments of a Nintendo DS ROM"
echo "Usage: $0 [-h] [-7] [-m OVERLAY] [-r BASEROM] [-d BUILDDIR] [START [END]]"
echo ""
echo "Arguments:"
echo " START, END Start and end virtual addresses to diff"
echo ""
echo "Options:"
echo " -7 Diff the ARM7 module (default: ARM9)"
echo " -m OVERLAY Diff the indicated overlay module (default: static module)"
echo " -r BASEROM Use the indicated baserom (default: baserom.nds)"
echo " -d BUILDDIR Look for compiled binaries in this directory (default: build/heartgold.us)"
echo " -f FILE Dump the indicated file, and use hexdump instead"
echo " -F FSDIR Filesystem path on the home system"
echo " -t Force THUMB instructions (default: ARM)"
echo " -h Show this message and exit"
}
while [[ $# -gt 0 ]]; do
key="$1"
case $key in
-h)
usage
exit 0
;;
-7)
proc=armv4t
builddir=${builddir:-$DEFAULT_ARM7BUILDDIR}
basestem=${basestem}.sub
shift
;;
-m)
[[ -n $overlay ]] && { echo can only do one overlay at a time; exit 1; }
mode=overlay
overlay="$2"
basestem=${basestem}.o${overlay}
shift 2
;;
-r)
baserom="$2"
shift 2
;;
-t)
thumb=-Mforce-thumb
shift
;;
-f)
mode=file
filepath="$2"
shift 2
;;
-F)
fsdir="$2"
shift 2
;;
-d)
builddir="$2"
shift 2
;;
-*)
usage
echo unrecognized option flag: "$1" >&2
exit 1
;;
*)
POSITIONAL+=("$1")
shift
;;
esac
done
set -- "${POSITIONAL[@]}"
mode=${mode:-static}
proc=${proc:-armv5te}
builddir=${builddir:-$DEFAULT_ARM9BUILDDIR}
baserom=${baserom:-$DEFAULT_BASEROM}
fsdir=${fsdir:-$DEFAULT_FSDIR}
basefile=${MYDIR}/.bins/${baserom}${basestem}.sbin
case "$mode" in
overlay)
case $proc in
armv4t)
ovt=88
;;
armv5te)
ovt=80
;;
esac
ovtoff=$(getword "$baserom" "$ovt")
vma=$(getword "$baserom" "$((ovtoff+32*overlay+4))")
size=$(getword "$baserom" "$((ovtoff+32*overlay+8))")
[[ -f $basefile ]] || {
fileid=$(getword "$baserom" "$((ovtoff+32*overlay+24))")
param=$(getword "$baserom" "$((ovtoff+32*overlay+28))")
fatoff=$(getword "$baserom" 72)
fileoff=$(getword "$baserom" "$((fatoff+8*fileid))")
filesize=$(($(getword "$baserom" "$((fatoff+8*fileid+4))")-fileoff))
dd if="$baserom" of="$basefile" bs=1 skip="$fileoff" count="$filesize" 2>/dev/null
(( param & 16777216 )) && {
compsize=$((param & 16777215))
$MYDIR/ntruncompbw $basefile $vma $((vma+compsize)) || { rm -f $basefile; exit 1; }
}
}
buildfile=$builddir/OVY_${overlay}.sbin
;;
static)
case $proc in
armv4t)
romtab=48
compname=ichneumon_sub
;;
armv5te)
romtab=32
compname=main
;;
esac
fileoff=$(getword "$baserom" "$romtab")
vma=$(getword "$baserom" "$((romtab+8))")
size=$(getword "$baserom" "$((romtab+12))")
[[ -f $basefile ]] || {
dd if="$baserom" of="$basefile" bs=1 skip="$fileoff" count="$size" 2>/dev/null
[[ $proc == armv5te ]] && {
_start_ModuleParams=$(getword "$baserom" $((fileoff+size+4)))
compstatend=$(getword "$basefile" $((_start_ModuleParams+20)))
[[ $compstatend != "0" ]] && {
$MYDIR/ntruncompbw $basefile $vma $compstatend || { rm -f $basefile; exit 1; }
dd if=/dev/zero of="$basefile" bs=1 seek="$((_start_ModuleParams+20))" count=4 conv=notrunc 2>/dev/null
}
}
}
buildfile=${builddir}/${compname}.sbin
;;
file)
buildfile=${fsdir}/${filepath}
[[ -f "${buildfile}" ]] || { echo file not found: "${buildfile}"; exit 1; }
basefile=${MYDIR}/.files/${filepath}
[[ -f "${basefile}" ]] || {
mkdir -p $(dirname "${basefile}")
${MYDIR}/ntrextractfile ${baserom} ${filepath} >${basefile}
}
diff -u <(hexdump -Cv $basefile) <(hexdump -Cv $buildfile)
exit 0
;;
esac
[[ -n "$1" ]] && start=$(($1)) || start=$vma
[[ -n "$2" ]] && size=$(($2)) || size=$(wc -c <$basefile)
do-objdump () {
arm-none-eabi-objdump -Drz -bbinary -m$proc $thumb --adjust-vma=$vma --start-address=$start --stop-address=$((start+size)) $1
}
diff -u <(do-objdump $basefile) <(do-objdump $buildfile)
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