#!/usr/bin/env bash
# Build the kernel's ABI test programs ("fixtures") from the pinned kernel
# source (out/kernel-src/user, exported by build-kernel.sh), with exactly the
# commands the kernel's build.rs uses. Under boot contract v1 the image
# carries them in /bin because the self-test runs them; they are *not* part
# of Foundry OS and their source stays in the kernel repo.
#
# Usage: scripts/build-fixtures.sh KERNEL_SRC OUT_DIR "rust names" "c names" "musl name:kind ..."
set -euo pipefail
SRC=$(realpath "$1")/user OUT=$(realpath -m "$2")
RUST=$3 C=$4 MUSL=$5
mkdir -p "$OUT"
RUSTC=${RUSTC:-rustc}
# Use the kernel's toolchain (rust-toolchain.toml in KERNEL_SRC): run from there.
cd "$SRC/.."
for p in $RUST; do
    "$RUSTC" --edition 2024 --target x86_64-unknown-none \
        -C panic=abort -C opt-level=2 -C debuginfo=0 -C strip=debuginfo \
        -C relocation-model=static -C code-model=large \
        -C "link-arg=-T$SRC/link.ld" -o "$OUT/$p" "$SRC/$p.rs"
done
# No libc at all: raw Linux syscalls, an ordinary static ET_EXEC at the
# usual 0x400000 (user space since Rustbelt 0.20.0).
for p in $C; do
    ${CC:-cc} -O2 -static -nostdlib -ffreestanding -fno-stack-protector \
        -no-pie -Wall -Wextra \
        -Wl,--build-id=none -z noexecstack \
        -o "$OUT/$p" "$SRC/$p.c"
done
# musl (Debian's musl-tools), always the stock recipes: "pie" is
# `musl-gcc -static-pie`, "exec" is plain `musl-gcc -static` (an ET_EXEC at
# 0x400000; Rustbelt runs that since 0.20.0), "dyn" must be refused.
# Entries are name:kind[:source] (source file in user/, default = name).
for entry in $MUSL; do
    IFS=: read -r p kind src <<< "$entry"
    src=$SRC/${src:-$p}.c
    common=(-O2 -Wall -Wextra -pthread -Wl,--build-id=none)
    case $kind in
        pie)  musl-gcc "${common[@]}" -static-pie "$src" -o "$OUT/$p" ;;
        dyn)  musl-gcc "${common[@]}" -fPIE -pie "$src" -o "$OUT/$p" ;;
        exec) musl-gcc "${common[@]}" -static "$src" -o "$OUT/$p" ;;
        *) echo "unknown musl kind $kind for $p"; exit 1 ;;
    esac
done
echo "[fixtures] $(ls "$OUT" | wc -l) programs in $OUT"