forked from Ports/goldeneye-pc-port
Dan Turner
d4cc71af0a
Adds native arm64 macOS support on top of #88's Intel macOS layer. The one structural change arm64 needs is an address model. The port realises the N64's 32-bit address space *as host addresses* — DRAM at 0x70000000, cart at 0x10000000, plus ~1700 linker-absolute symbols — which is only sound while host addresses fit in 32 bits. Native arm64 cannot map below 4 GiB (__PAGEZERO; a shrunken pagezero is SIGKILLed at exec; PIE is mandatory; MAP_32BIT fails). So the whole space is relocated to a fixed host base, PORT_ADDR_BASE (16 TiB), with portN64ToHost / portHostToN64 / PORT_N64PTR as the conversion chokepoints. PORT_ADDR_BASE is 0 on every other platform, so all of this is an identity there. That relocation then surfaces a class of latent 64-bit bugs that are invisible at base 0 — any place the decomp round-trips a pointer through a 32-bit integer. The src/ changes here are that class: pointer-width/layout only, no behaviour change, N64 branch textually unchanged, each documented in docs/dev/findings.md (D298/M2). Also: Mach-O absolute-symbol generation at the same base, #pragma weak -> symbol equates, __x86_64__ -> PLATFORM_64BIT, Darwin crash handler/ucontext, shm_open DRAM, the AppKit main-thread guard, and the sidecar generation that was the real boot blocker. Verified: 21/21 solo levels boot, render and run crash-free.