Pinball FX2 VR (32-bit, through the a32 bridge) died ~2 s after its loading
screen with "a32: block at 0xf68587a0 overflowed the code buffer" (exit 127):
OpenSSL's sha1_block_data_order_armv8 (reached from RAND_poll) has ~60 SHA-1
crypto instructions in a row, each translated through the interpreter with
its own exit stub, and the block loop only stopped at 96 instructions or half
the code buffer, so the 64-entry stub table overflowed and fatal() ended the
process. The loop now also ends a block while 8 stubs are left.
Headless on the dev Frame the game now runs on past that point (menu-size
swapchains, recenter, its save files written) instead of exiting.
tests/programs/sha1ce.c (72 crypto instructions in a row + an unrolled SHA-1)
failed with the old a32run and passes with the new one, JIT = interpreter.
Triage signature a32-jit-overflow, PLAYBOOK row; frame.a32_bridge marks only
Pinball FX2 VR "Update on Frame" (package_revisions).
Interpreter + JIT for ARM, Thumb-2, VFPv4 and NEON, ARM EABI syscall
translation, signals, threads and self-modifying code. Runs static bionic
programs on the Frame. Tests: A64 encoders vs llvm-mc, a differential
instruction fuzzer and program tests against qemu-arm. Not shipped; the
README lists the steps towards running 32-bit-only APKs.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
spoopyghosty0