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#!/usr/bin/env bash
#
# scripts/test-fault.sh — fault-diagnostics verification.
#
# Real hardware has no serial console, so a kernel crash previously left
# only a frozen screen ("unresponsive"). This test proves the fault-dump
# path: every CPU exception now prints a white-on-red band to the
# framebuffer *and* a parseable serial line (vector, error, RIP, CR2,
# task) before halting — so the next real-hardware failure identifies
# itself. The `fault` command deliberately writes to an unmapped
# address; the machine must halt with a full dump, not triple-fault.
#
# Usage: ./scripts/test-fault.sh
# Env: OVMF, QEMU (same defaults as other test scripts)
#
set -euo pipefail
SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
cd "$PROJECT_DIR"
OVMF="${OVMF:-/usr/share/edk2/x64/OVMF.4m.fd}"
QEMU="${QEMU:-qemu-system-x86_64}"
ESP_DIR="$PROJECT_DIR/esp"
QPID=/tmp/rsdos-fault-qpid
SOCK=/tmp/rsdos-fault-qmon.sock
LOG=/tmp/rsdos-fault-serial.log
QLOG=/tmp/rsdos-fault-qemu.log
trap 'kill "$(cat "$QPID" 2>/dev/null)" 2>/dev/null || true' EXIT
fail() {
echo "FAIL: $1"
[ -f "$LOG" ] && tail -40 "$LOG"
exit 1
}
wait_log() {
local i=0
while [ "$i" -lt $((${3:-60} * 10)) ]; do
grep -q "$2" "$1" 2>/dev/null && return 0
sleep 0.1
i=$((i + 1))
done
return 1
}
echo "==> 1/5 build kernel (debug)"
cargo build --package rsdos --target x86_64-unknown-uefi
echo "==> 2/5 deploy to ESP"
mkdir -p "$ESP_DIR/EFI/BOOT"
cp target/x86_64-unknown-uefi/debug/rsdos.efi "$ESP_DIR/EFI/BOOT/BOOTX64.EFI"
echo "==> 3/5 boot QEMU (headless)"
kill "$(cat "$QPID" 2>/dev/null)" 2>/dev/null || true
sleep 1
rm -f "$SOCK" "$LOG"
"$QEMU" -bios "$OVMF" \
-drive file=fat:rw:"$ESP_DIR",format=raw \
-serial file:"$LOG" \
-monitor unix:"$SOCK",server,nowait \
-m 256M -machine q35 -cpu qemu64 -no-reboot -display none \
>"$QLOG" 2>&1 &
echo $! >"$QPID"
wait_log "$LOG" "boot: entering shell" 90 || fail "kernel never reached the shell"
echo "==> 4/5 boot diagnostics present"
grep -aq "gop: fb base=" "$LOG" || fail "fb geometry diagnostic missing"
grep -aq "gop: mode .* selected" "$LOG" || fail "mode-selection diagnostic missing"
echo "==> 5/5 inject a page fault (fault command)"
python3 "$SCRIPT_DIR/sendkeys.py" --sock "$SOCK" \
"clear" \
"fault"
sleep 2
# The dump must appear on serial: vector 14, the CR2 we wrote, RIP, and
# the shell task identity — then the machine halts (never triple-faults).
grep -aq "!!! page fault vec=14 .*rip=" "$LOG" || fail "page-fault dump line missing"
grep -aq "cr2=0x400000000000" "$LOG" || fail "CR2 not reported (faulting address)"
grep -aq "task=0 \"shell\"" "$LOG" || fail "faulting task not identified"
grep -aq "!!! halting" "$LOG" || fail "no halt message"
# The screen dump itself is exercised in-kernel (dump_lines); the serial
# path sharing the same format line is verified above.
echo ""
echo "PASS — fault dump works (vec, err, rip, cr2, task → screen + serial)"
echo " every CPU exception now halts with a diagnosable dump, not a freeze"
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