#!/bin/sh

set -e

in=$1
out=$2

# Add -s 0x1234 to te ndisasm command-line to specify that there is an
# instruction starting at 0x1234. Use this when ndisasm misinterprets
# some instructions due to db.
skip="-s 0x16F40C -s 0x16F415 -s 0x16FBD0"
for i in `seq 0 255`; do skip="$skip -s 0x7e$(printf %02x $i)"; done
(echo "[BITS 16]"; \
 echo "[ORG 0x7c00]"; \
 ndisasm -s 0x7c78 $skip -o 0x7C00 -b 16 "$in" \
 | uniq -s 8 -c \
 | sed -e 's/^\s*1 //' -e 't' -e 's/^\s*\([0-9]\+\) \([^ ]\+\s\+[^ ]\+\s\+\)/\2times \1 /' \
 | sed -e 's/\([^ ]\+\s\+[0-9A-F]\{4\}\s\+j[^ ]\+ \)0x/\1short 0x/') > "$out"
# The last sed line just above fixes an issue with ndisasm
# (it fails to annotate jz and jnc (and possibly other) with short).