ppsspp

preserve-emulation/ppsspp

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Henrik RydgårdandClaude Opus 5.5 8e2bb1faed 32-bit: Keep the memory view range reserved, and mask guest addresses to it

Find4GBBase found 256 MB of free address space for the views and then
unmapped it, so the gaps between the views went back to the system. On a
32-bit Android device, a running game had malloc heaps between VRAM and RAM
and GPU driver buffers just past RAM, and masked guest addresses (bits 30-31
cleared) reach a whole GB above base, mostly heap. A stray guest access
landed in those silently instead of faulting, and another thread could even
map something where a view was about to go, which the view's MAP_FIXED then
replaced. That fits the 32-bit-only crashes deep in system libraries and in
our own heap structures.

Keep the range reserved as PROT_NONE and map the views over it, putting the
reservation back when a view is released. Mask out bits 28-29 too on 32-bit
(no valid address has them), so accesses stay inside the reservation.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

2026-10-20 23:21:11 +02:00

ArmIRAsm.cpp

CPU: Give each MIPSState an address space for its memory accesses

2026-10-20 18:41:28 +02:00

ArmIRCompALU.cpp

ARM32 IR JIT: Integer arithmetic, logic, shifts, compares, mult and div

2026-10-14 17:32:53 +02:00

ArmIRCompBranch.cpp

ARM32: Start an IR-based JIT

2026-10-14 17:32:53 +02:00

ArmIRCompFPU.cpp

ARM32 IR JIT: Pass float helper arguments the softfp way where needed