macOS (Apple Silicon) support: native build running under Rosetta 2 with MoltenVK (#102)

* macos: POSIX platform layer (host fault handler, virtual memory)

- hostException: Mach/POSIX signal-based host fault handler mirroring the
  Windows vectored handler (SIGSEGV/SIGBUS/SIGILL), behind
  '#elif defined(__APPLE__)'. Windows and Linux branches are untouched.
- sysLinuxVirtual: mach_vm_region-based is_mapped (no /proc/self/maps on
  macOS), PTHREAD_MUTEX_NORMAL, and a MAP_FIXED carve-in-place allocator that
  never leaves an unmapped hole for dyld/Rosetta/Metal to claim. All
  __APPLE__-guarded; the original Linux allocator path is preserved verbatim.
- sysLinuxDbg/sysLinuxFileIO: libgen.h for basename(), and a POSIX
  opendir/readdir implementation of SysFileGetDents (previously a stub).

* macos: guest kernel backing, threads, and POSIX libs

- memory/memoryAddressSpace: anonymous shm_open backing (macOS has no
  memfd_create) and re-reserve-on-unmap so a guest MAP_FIXED remap never
  destroys a host mapping (__APPLE__-guarded). Drops host <sys/mman.h> MAP_*
  macros so the guest's constexpr MAP_* constants compile (no-op on Windows).
- pthread: undef the host PTHREAD_STACK_MIN macro; on non-Windows, pin the
  stack-switch asm's guest rsp/rbp to callee-saved r14/r15 (the template
  clobbers r12/r13); __APPLE__ no-op for the absent pthread_condattr_setclock.
  The Windows stack-switch asm is byte-identical.
- network: define SOCKET/INVALID_SOCKET for the non-Windows paths (were
  undefined at 20+ use sites), and rename the non-Windows kernel_clock_*
  helpers to the CamelCase names the callers already use. Both repair the
  shared non-Windows build. Integer reinterpret_cast -> static_cast.

* loader: pin stack-switch asm operands to callee-saved registers

RunEntry switches to the guest stack with an asm template that clobbers
r12/r13 before consuming its inputs. With plain "r" constraints the compiler
may place func/guest_rsp/guest_rbp into r12/r13, so 'callq *func' jumps
through the saved host rsp -- a latent miscompile on every platform that any
unrelated codegen change can trigger. Pin the inputs to rbx/r14/r15, which the
template never touches and the SysV callee preserves.

General correctness fix (not macOS-specific); the same fix is applied to
pthread RunOnGuestStack.

* macos: Vulkan/MoltenVK graphics enablement

- pageManager: GPU write-tracking via Mach VM queries + mprotect (mprotect
  cannot report the previous protection, so the expected-old check is dropped),
  thread id via pthread_mach_thread_np, 4 KB page-size check -- __APPLE__-guarded.
- shaders/renderDraw/vulkanWindow: MoltenVK lacks VK_EXT_color_write_enable,
  VK_EXT_depth_clip_enable and depthBounds; fall back to static color-write
  masks and default depth clipping, request VK_KHR_portability_subset, and
  reuse the graphics queue for present when only one queue is exposed. Non-Apple
  pipeline/extension setup is unchanged.
- window: optional borderless window (KYTY_BORDERLESS) to sidestep a Rosetta
  NSException in macOS window chrome.

* graphics: macOS thread identity for region tracking

Region-ownership locks resolve the current thread via GetCurrentThreadId()
on Windows and EXIT elsewhere. Use the Mach thread port on macOS (nonzero
per-thread id; 0 stays the no-owner sentinel).

* macos: marshal AppKit window operations to the main thread

The present worker thread shows the window, updates its icon and title, and
recreates a lost Vulkan surface. AppKit traps with 'Must only be used from the
main thread' when these run off the main thread. Route them through a small
task queue drained by the SDL main loop (an SDL_USEREVENT wakes the loop when
it is blocked in SDL_WaitEvent). Title updates are fire-and-forget; showing
the window and surface recreation wait for completion.

Windows and Linux call the SDL functions directly, as before.

* build: ignore the _Build output directory

_Build is the conventional out-of-tree build location (only _Build/vscode-clang
was ignored); a stray git add could sweep build artifacts into a commit.

* macos: isolate stack-switch workaround

---------

Co-authored-by: nmzik <Nmzik@mail.ru>

src/loader/runtimeLinker.cpp

@@ -345,28 +345,48 @@ static KYTY_SYSV_ABI void RunEntry(uint64_t addr, EntryParams* params, atexit_fu
 		guest_root_frame[0]    = 0;
 		guest_root_frame[1]    = 0;
 
-		asm volatile("pushq %%r12\n\t"
-		             "pushq %%r13\n\t"
-		             "movq %%rsp, %%r12\n\t"
-		             "movq %%rbp, %%r13\n\t"
-		             "movq %[guest_rsp], %%rsp\n\t"
-		             "movq %[guest_rbp], %%rbp\n\t"
-		             "callq *%[func]\n\t"
-		             "movq %%r13, %%rbp\n\t"
-		             "movq %%r12, %%rsp\n\t"
-		             "popq %%r13\n\t"
-		             "popq %%r12\n\t"
-		             :
-		             : [func] "r"(func), "D"(params),
-		               "S"(atexit_func), [guest_rsp] "r"(guest_rsp), [guest_rbp] "r"(guest_rbp)
-		             : "cc", "memory", "rax", "rcx", "rdx", "r8", "r9", "r10", "r11", "xmm0",
-		               "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7", "xmm8", "xmm9",
-		               "xmm10", "xmm11", "xmm12", "xmm13", "xmm14", "xmm15");
+#if defined(__APPLE__)
+		// Clang on macOS can allocate plain "r" inputs to r12/r13, which the template
+		// clobbers before consuming them. Pin the inputs to registers the SysV guest
+		// preserves without changing register allocation on Windows or Linux.
+		register entry_func_t func_reg asm("rbx")      = func;
+		register uintptr_t    guest_rsp_reg asm("r14") = guest_rsp;
+		register uintptr_t    guest_rbp_reg asm("r15") = guest_rbp;
+#endif
+
+		asm volatile(
+		    "pushq %%r12\n\t"
+		    "pushq %%r13\n\t"
+		    "movq %%rsp, %%r12\n\t"
+		    "movq %%rbp, %%r13\n\t"
+		    "movq %[guest_rsp], %%rsp\n\t"
+		    "movq %[guest_rbp], %%rbp\n\t"
+		    "callq *%[func]\n\t"
+		    "movq %%r13, %%rbp\n\t"
+		    "movq %%r12, %%rsp\n\t"
+		    "popq %%r13\n\t"
+		    "popq %%r12\n\t"
+		    :
+#if defined(__APPLE__)
+		    : [func] "r"(func_reg), "D"(params),
+		      "S"(atexit_func), [guest_rsp] "r"(guest_rsp_reg), [guest_rbp] "r"(guest_rbp_reg)
+#else
+		    : [func] "r"(func), "D"(params),
+		      "S"(atexit_func), [guest_rsp] "r"(guest_rsp), [guest_rbp] "r"(guest_rbp)
+#endif
+		    : "cc", "memory", "rax", "rcx", "rdx", "r8", "r9", "r10", "r11", "xmm0", "xmm1", "xmm2",
+		      "xmm3", "xmm4", "xmm5", "xmm6", "xmm7", "xmm8", "xmm9", "xmm10", "xmm11", "xmm12",
+		      "xmm13", "xmm14", "xmm15");
 		return;
 	}
 
 	uintptr_t guest_root_frame[2] = {};
 
+#if defined(__APPLE__)
+	register entry_func_t func_reg asm("rbx")      = func;
+	register uintptr_t    guest_rbp_reg asm("r14") = reinterpret_cast<uintptr_t>(guest_root_frame);
+#endif
+
 	asm volatile("pushq %%r12\n\t"
 	             "pushq %%r13\n\t"
 	             "movq %%rbp, %%r12\n\t"
@@ -376,8 +396,13 @@ static KYTY_SYSV_ABI void RunEntry(uint64_t addr, EntryParams* params, atexit_fu
 	             "popq %%r13\n\t"
 	             "popq %%r12\n\t"
 	             :
+#if defined(__APPLE__)
+	             : [func] "r"(func_reg), "D"(params),
+	               "S"(atexit_func), [guest_rbp] "r"(guest_rbp_reg)
+#else
 	             : [func] "r"(func), "D"(params),
 	               "S"(atexit_func), [guest_rbp] "r"(guest_root_frame)
+#endif
 	             : "cc", "memory", "rax", "rcx", "rdx", "r8", "r9", "r10", "r11", "xmm0", "xmm1",
 	               "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7", "xmm8", "xmm9", "xmm10", "xmm11",
 	               "xmm12", "xmm13", "xmm14", "xmm15");