#!/bin/sh
# Build a VT1200 payload/app with the 1987 TI TMS34010 SDK (GSPA/GSPLNK under
# DOSBox), keeping the linked COFF so dwt/loader/coff.py can inspect it.
#
#   dwt/loader/build.sh SOURCE.asm [TEXT_ORIGIN [DATA_ORIGIN [BSS_ORIGIN]]]
#
# Origins are BIT addresses (the TMS34010 and GSPLNK's SECTIONS origins are
# bit addresses).  With only TEXT_ORIGIN the linker command binds .text alone,
# exactly like dwt/gui/build.sh.  With DATA_ORIGIN/BSS_ORIGIN it binds all
# three sections, which is what the marker app needs.
#
# Outputs, all under dwt/loader/build/:
#   <name>.bin    the linked .text bytes (convenience; not a COFF)
#   <name>.coff   the GSPLNK output, byte-for-byte (the loader's real input)
#   <name>.map    the link map
#   <name>.lst    the assembler listing (addresses in bits)
#
# ENTRY_SYM=<symbol> adds `-e <symbol>`; default is `_start` if the symbol
# exists, otherwise no -e (GSPLNK then writes entry = 0).
set -eu

ROOT=$(cd "$(dirname "$0")/../.." && pwd)
DIR=$(cd "$(dirname "$0")" && pwd)
SRC=${1:?usage: build.sh SOURCE.asm [TEXT_ORIGIN [DATA_ORIGIN [BSS_ORIGIN]]]}
TEXT=${2:-01800000}
DATA=${3:-}
BSS=${4:-}
NAME=$(basename "$SRC" .asm)
BASE=$(printf '%s' "$NAME" | tr 'a-z' 'A-Z')
WORK="$DIR/work"
OUT="$DIR/build"
IMG="$ROOT/tools/tms34010-sdk/1987-05 TMS34010 SDK/1987-11-06 TMS34010 Simulator-C Tools-ASM Tools.img"
DOSBOX_CONF="$ROOT/harness/sdk-scratch/dosbox-bench.conf"

mkdir -p "$WORK" "$OUT"

if [ ! -x "$WORK/GSPA.EXE" ]; then
    mcopy -s -n -i "$IMG" "::/A2/*" "$WORK/"
    mcopy -s -n -i "$IMG" "::/C2/*" "$WORK/"
fi

cp "$SRC" "$WORK/$BASE.ASM"

# TI hex constants must begin with a decimal digit.
tihex() {
    case "$1" in
        [0-9]*) printf '%s' "$1" ;;
        *) printf '0%s' "$1" ;;
    esac
}

TEXT=$(tihex "$TEXT")
ENTRY=${ENTRY_SYM:-_start}

{
    printf '%s\n' '-a'
    printf '%s\n' '-o '"$BASE"'.out'
    printf '%s\n' '-m '"$BASE"'.map'
    [ -n "${ENTRY:-}" ] && printf '%s\n' '-e '"$ENTRY"
    printf '%s\n' "$BASE.obj"
    printf '%s\n' 'SECTIONS'
    printf '%s\n' '{'
    printf '%s\n' "  .text ${TEXT}h: {}"
    if [ -n "$DATA" ]; then
        printf '%s\n' "  .data $(tihex "$DATA")h: {}"
    fi
    if [ -n "$BSS" ]; then
        printf '%s\n' "  .bss  $(tihex "$BSS")h: {}"
    fi
    printf '%s\n' '}'
} > "$WORK/$BASE.CMD"
sed -i 's/$/\r/' "$WORK/$BASE.CMD"

rm -f "$WORK/$BASE.OBJ" "$WORK/$BASE.OUT" "$WORK/$BASE.LST" \
      "$WORK/$BASE.MAP" "$WORK/$BASE.HI" "$WORK/$BASE.LO"

SDL_VIDEODRIVER=dummy SDL_AUDIODRIVER=dummy \
timeout 180 dosbox -conf "$DOSBOX_CONF" -noprimaryconf -nolocalconf \
    -c "mount c $WORK" -c "c:" \
    -c "gspa $BASE $BASE.obj $BASE.lst -l" \
    -c "gsplnk $BASE.cmd" \
    -c "exit" -exit >/dev/null 2>&1

if [ ! -f "$WORK/$BASE.OUT" ]; then
    echo "build.sh: GSPLNK produced no $BASE.OUT" >&2
    sed 's/\r$//' "$WORK/$BASE.MAP" 2>/dev/null | tail -20 >&2 || true
    exit 1
fi
if [ ! -f "$WORK/$BASE.OBJ" ]; then
    echo "build.sh: GSPA produced no $BASE.OBJ" >&2
    grep -n '\*\*\*\*\*' "$WORK/$BASE.LST" >&2 || true
    exit 1
fi
if grep -q '\*\*\*\*\*' "$WORK/$BASE.LST"; then
    echo "build.sh: assembler diagnostics:" >&2
    grep -n '\*\*\*\*\*' "$WORK/$BASE.LST" >&2
    exit 1
fi

cp "$WORK/$BASE.OUT" "$OUT/$NAME.coff"
cp "$WORK/$BASE.OBJ" "$OUT/$NAME.obj"
sed 's/\r$//' "$WORK/$BASE.MAP" > "$OUT/$NAME.map"
cp "$WORK/$BASE.LST" "$OUT/$NAME.lst"
python3 "$ROOT/harness/hello-world/cofextract.py" "$WORK/$BASE.OUT" "$OUT/$NAME.bin"
echo "build.sh: $OUT/$NAME.coff ($(wc -c < "$OUT/$NAME.coff") bytes); .bin $(wc -c < "$OUT/$NAME.bin") bytes at bit $TEXT"