kernel_main on riscv64 ran directly on EDK2's UEFI boot-time stack, with
no dedicated stack switch — amd64 has always had a kernel_entry.S
trampoline for exactly this reason (its own comment: "the FORTH
interpreter + DOE experiment loop can easily exceed that depth").
aarch64 happens to get away without one because its firmware's default
stack is apparently larger, but that was never a guarantee.
On riscv64 the VM bootstrap's call depth (27 word-registration modules
-> physics/SSM init -> Tripod capsule birth) overflowed that small
stack, corrupting a return address and producing a wild jump / page
fault right after vm_init_with_host() returned — reproduced consistently
across the 2026-08-01 DoE campaign logs.
- src/starkernel/arch/riscv64/kernel_entry.S (new): RISC-V stack-switch
trampoline mirroring amd64's, giving the kernel a dedicated 2 MiB BSS
stack before anything deep runs.
- kernel_main.c: riscv64 now builds kernel_main_impl (invoked via the
trampoline) instead of kernel_main directly, same pattern as amd64.
- Makefile.starkernel: wires the new file into the riscv64 build.
- uefi_loader.c: RAW_LOG() was silently a no-op on every non-amd64 arch;
added a real raw-UART writer for riscv64 (QEMU virt's uart8250 at MMIO
0x10000000) so existing loader diagnostics actually produce output.
Verified: all three architectures boot clean to [Hera] ok> in the
required order (amd64, aarch64, riscv64); logs and DoE CSVs from these
runs included.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
The aarch64 loader link step hardcoded the unversioned "lld-link", which
isn't on PATH by default on this Debian/Ubuntu setup (the package only
installs lld-link-18 under /usr/bin; unversioned lld-link lives under
/usr/lib/llvm-18/bin). CI worked around this with an explicit PATH prefix
in the workflow; a local build without that PATH override failed. Now
auto-detects whichever name resolves, falling back to the versioned name.
Verified: aarch64 builds clean with the default PATH.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Kernel version only — the embedded StarForth engine version (3.1.0) is left
alone since it tracks a vendored copy that has genuinely diverged from the
standalone StarForth repo, not something to auto-sync. Verified builds on
amd64, aarch64, and riscv64.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
