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Brian Degenhardt
77d008af1d
Port the W^X protocol from the previous ARMSX2 recompilers (aR*/aVU) onto the transplanted JIT so it runs under all four DarwinMisc JIT modes: Simulator (MAP_JIT + pthread_jit_write_protect_np toggle), iOS 26 LuckTXM and LuckNoTXM (vm_remap dual-mapping, writes at rx + g_code_rw_offset), and Legacy (mprotect RW/RX toggle, iOS <= 18). - AsmHelpers: export armGetWritableCodePtr (RX -> RW alias, identity off Apple); armStartBlock/armEndBlock switch to BeginCodeWriteRange with a 1 MiB Legacy write window and construct the MacroAssembler over the RW alias while armAsmPtr stays the RX base, so armGetCurrentCodePointer() and all displacement math remain in execute space; armEmitJmpPtr and the constant-pool trampoline/literal writes go through the alias with their own write scopes. - Arm64BaseBlocks::PatchAtomic (block linking + exception-path unlink) and recPatchIslandB store via the alias; displacements/icache flushes stay RX. - RecStubs fastmem backpatch stores the redirect B via the alias. - microVU: the persistent per-VU MacroAssembler is built over the alias of prog.x86start; ProgCache hydration fixups patch through the alias while Rel26/ADRP math keeps using the RX chunk address. - recExecute re-arms Legacy-mode execute protection via DarwinMisc::LegacyEnsureExecutable (mirrors the previous recompiler). - BeginCodeWrite/EndCodeWrite skip the macOS MAP_JIT toggle when a dual-mapping is active (offset != 0), matching the iOS branches. - CI validation without an iOS device: ARMSX2_FORCE_DUAL_MAP=1 now also works on macOS (Memory.cpp routes the code arena through DarwinMisc::MmapCodeDualMap, which builds the vm_remap RW alias there), and the macOS workflow reruns recompiler_tests under it, forcing every emission/patch path through the alias. Production macOS keeps MAP_JIT with offset 0, unchanged. Linux/Android paths compile to identity no-ops. Gates: recompiler_tests 1359/1359, gs_vertex_tests 21/21, mvu_progcache_versioning_tests 13/13.