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fix: stacks at top of user VA in own 1 MiB band (guard, heap kept below), 8/16 pages default; kernel fault msg names pid, kind, flags stack overflow; flaky OVERFLOW + spawntest/test-qemu check it

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This commit is contained in:
Gabriel Kaszewski
2026-10-28 16:03:06 +01:00
parent 18e8b3ecb8
commit 495bf03484
12 changed files with 93 additions and 22 deletions
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22
crates/adapter-riscv/src/trap/mod.rs
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@@ -182,17 +182,29 @@ fn handle_exception(frame: &mut TrapFrame, scause: usize) {
.is_some_and(|ctx| fp::first_use(frame, ctx)) => {}
_ => {
let uart = crate::hw::uart::Uart::new();
uart.write_str("FAULT: scause=");
uart.write_hex(scause);
let stval: usize;
unsafe { core::arch::asm!("csrr {0}, stval", out(reg) stval) };
uart.write_str(" stval=");
let kern = kern();
uart.write_str("FAULT pid=");
let pid = kern.current_thread().and_then(|t| kern.thread_process(t));
uart.write_hex(pid.map_or(usize::MAX, |p| p.raw() as usize));
uart.write_str(": ");
uart.write_str(match scause {
2 => "illegal instruction",
5 | 13 => "load fault",
7 | 15 => "store fault",
12 => "instruction fetch fault",
_ => "fault",
});
uart.write_str(" at ");
uart.write_hex(stval);
uart.write_str(" sepc=");
if matches!(scause, 5 | 7 | 13 | 15) && types::layout::is_stack_overflow(stval) {
uart.write_str(" (stack overflow: give it more stack)");
}
uart.write_str(", pc ");
uart.write_hex(frame.sepc);
uart.put_char(b'\n');
let kern = kern();
if let Some(current_tid) = kern.current_thread() {
let fault = match scause {
2 => domain::fault::Fault::IllegalInstruction,