PCem patch to get things working on Apple Silicon, partially at least

pcem_apple_silicon.patch

diff --git a/configure.ac b/configure.ac
index 407b057..b237e9e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -72,6 +72,9 @@ case "${host_cpu}" in
     CPU=arm64
     AC_MSG_RESULT(${host_cpu})
     ;;
+    arm)
+    CPU=arm64 # MacOS has "arm" in the host string
+    ;;
     *)
     AC_MSG_ERROR([Unsupported CPU. ${host_cpu}])
     ;;
diff --git a/src/386_dynarec.c b/src/386_dynarec.c
index 9dedf44..6a59d76 100644
--- a/src/386_dynarec.c
+++ b/src/386_dynarec.c
@@ -1,6 +1,9 @@
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
+#if defined __APPLE__ && defined __aarch64__
+#include <pthread.h>
+#endif
 #include "ibm.h"
 #include "x86.h"
 #include "x86_ops.h"
@@ -410,6 +413,10 @@ static inline void exec_recompiler(void)
 
                 cpu_new_blocks++;
 
+#if defined __APPLE__ && defined __aarch64__
+                pthread_jit_write_protect_np(0);
+#endif
+
                 codegen_block_start_recompile(block);
                 codegen_in_recompile = 1;
 
@@ -481,6 +488,10 @@ static inline void exec_recompiler(void)
                         codegen_reset();
 
                 codegen_in_recompile = 0;
+
+#if defined __APPLE__ && defined __aarch64__
+                pthread_jit_write_protect_np(1);
+#endif
         }
         else if (!cpu_state.abrt)
         {
diff --git a/src/Makefile.am b/src/Makefile.am
index 8197093..2a5d7ce 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -125,6 +125,7 @@ pcem_SOURCES += cdrom-ioctl-dummy.c wx-sdl2-display.c
 endif
 
 if OS_MACOSX
+DEFAULT_INCLUDES = -iquote /opt/homebrew/include
 pcem_SOURCES += cdrom-ioctl-osx.c wx-sdl2-display.c
 pcem_CFLAGS += -DPCEM_RENDER_WITH_TIMER -DPCEM_RENDER_TIMER_LOOP
 pcem_CXXFLAGS += -DPCEM_RENDER_WITH_TIMER -DPCEM_RENDER_TIMER_LOOP
@@ -137,7 +138,7 @@ pcem_LDADD += wx.res
 endif
 
 if !HAS_OFF64T
-#pcem_CFLAGS += -Doff64_t=off_t -Dfopen64=fopen -Dfseeko64=fseek -Dftello64=ftell
+pcem_CFLAGS += -Doff64_t=off_t -Dfopen64=fopen -Dfseeko64=fseek -Dftello64=ftell
 endif
 
 if RELEASE_BUILD
diff --git a/src/codegen_allocator.c b/src/codegen_allocator.c
index 5807b5d..fa5ea17 100644
--- a/src/codegen_allocator.c
+++ b/src/codegen_allocator.c
@@ -3,6 +3,9 @@
 #include <unistd.h>
 #include <stdlib.h>
 #endif
+#ifdef __APPLE__
+#include <libkern/OSCacheControl.h>
+#endif
 #if defined WIN32 || defined _WIN32 || defined _WIN32
 #include <windows.h>
 #endif
@@ -30,6 +33,8 @@ void codegen_allocator_init()
 
 #if defined WIN32 || defined _WIN32 || defined _WIN32
         mem_block_alloc = VirtualAlloc(NULL, MEM_BLOCK_NR * MEM_BLOCK_SIZE, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
+#elif defined __APPLE__
+        mem_block_alloc = mmap(0, MEM_BLOCK_NR * MEM_BLOCK_SIZE, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE|MAP_JIT, 0, 0);
 #else
         mem_block_alloc = mmap(0, MEM_BLOCK_NR * MEM_BLOCK_SIZE, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, 0, 0);
 #endif
@@ -117,7 +122,11 @@ void codegen_allocator_clean_blocks(struct mem_block_t *block)
 #if defined __ARM_EABI__ || defined __aarch64__
         while (1)
         {
+#if defined(IOS) || defined(__APPLE__)
+		sys_cache_control(kCacheFunctionPrepareForExecution, &mem_block_alloc[block->offset], MEM_BLOCK_SIZE);
+#else
 		__clear_cache(&mem_block_alloc[block->offset], &mem_block_alloc[block->offset + MEM_BLOCK_SIZE]);
+#endif
 		if (block->next)
 			block = &mem_blocks[block->next - 1];
 		else
diff --git a/src/pc.c b/src/pc.c
index 6ed0be9..1dc85d5 100644
--- a/src/pc.c
+++ b/src/pc.c
@@ -1,6 +1,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
+#if defined __APPLE__ && defined __aarch64__
+#include <pthread.h>
+#endif
 #include "ibm.h"
 #include "device.h"
 
@@ -306,9 +309,17 @@ void initpc(int argc, char *argv[])
         mem_init();
         loadbios();
         mem_add_bios();
-                        
+
+#if defined __APPLE__ && defined __aarch64__
+        pthread_jit_write_protect_np(0);
+#endif
+
         codegen_init();
-        
+
+#if defined __APPLE__ && defined __aarch64__
+        pthread_jit_write_protect_np(1);
+#endif
+
         timer_reset();
         sound_reset();
         io_init();
diff --git a/src/wx-thread.c b/src/wx-thread.c
index b5958ad..7900941 100644
--- a/src/wx-thread.c
+++ b/src/wx-thread.c
@@ -1,6 +1,9 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <time.h>
+#if defined __APPLE__
+#include <sys/time.h>
+#endif
 #include "thread.h"
 #if defined WIN32 || defined _WIN32 || defined _WIN32
 #include <windows.h>