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#!/bin/sh
# Build a gbos C program into a self-contained 16 KiB ROM-bank image.
# SDCC native toolchain; crt0 linked FIRST so _start is the $4000 entry.
# usage: c/build.sh <prog.c> <out.bin>
set -e
SRC="$1"; OUT="$2"; B=build/c
LIBDIR=/usr/share/sdcc/lib/sm83
mkdir -p "$B"
sdasgb -o "$B/crt0.rel" c/crt0.s
sdasgb -o "$B/libc.rel" c/libc.s
sdcc -msm83 -c -Ic c/libc.c -o "$B/libc_c.rel"
sdcc -msm83 -c -Ic "$SRC" -o "$B/prog.rel"
# link: crt0 first (=> _start at 0x4000), then libc, program, and sm83 lib
sdldgb -n -m -w -j -i "$B/prog.ihx" \
-b _CODE=0x4000 -b _DATA=0xa000 \
-k "$LIBDIR" -l sm83 \
"$B/crt0.rel" "$B/libc.rel" "$B/libc_c.rel" "$B/prog.rel"
makebin -Z -p "$B/prog.ihx" "$B/prog.bin"
dd if="$B/prog.bin" of="$OUT" bs=1024 skip=16 count=16 2>/dev/null
echo "wrote $OUT ($(wc -c < "$OUT") bytes); entry:"
grep -iE ' _start| _main' "$B/prog.map" | head -2
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