Initial support for iOS ARM64 (Aarch64)

* darwin_stop_world.c (GC_stack_range_for): Handle AARCH64 case.
* include/private/gc_priv.h (GC_THREAD_STATE_T, GC_MACH_THREAD_STATE,
GC_MACH_THREAD_STATE_COUNT): Define for AARCH64.
* include/private/gcconfig.h (OS_TYPE, DYNAMIC_LOADING, DATASTART,
DATAEND, STACKBOTTOM, USE_MMAP, USE_MMAP_ANON, MPROTECT_VDB,
GETPAGESIZE, NO_PTHREAD_TRYLOCK, NO_DYLD_BIND_FULLY_IMAGE): Likewise.
* include/private/gcconfig.h (AARCH64, mach_type_known,
DARWIN_DONT_PARSE_STACK): Define for Darwin/AArch64.

3 files changed, 72 insertions, 1 deletions

diff --git a/darwin_stop_world.c b/darwin_stop_world.c
index fc747f53..3c4f85bc 100644
--- a/darwin_stop_world.c
+++ b/darwin_stop_world.c
@@ -278,6 +278,46 @@ STATIC ptr_t GC_stack_range_for(ptr_t *phi, thread_act_t thread, GC_thread p,
       GC_push_one(state.THREAD_FLD(lr));
       GC_push_one(state.THREAD_FLD(cpsr));
 
+#   elif defined(AARCH64)
+      lo = (void *)state.__sp;
+#     ifndef DARWIN_DONT_PARSE_STACK
+        *phi = GC_FindTopOfStack(state.__sp);
+#     endif
+      GC_push_one(state.__x[0]);
+      GC_push_one(state.__x[1]);
+      GC_push_one(state.__x[2]);
+      GC_push_one(state.__x[3]);
+      GC_push_one(state.__x[4]);
+      GC_push_one(state.__x[5]);
+      GC_push_one(state.__x[6]);
+      GC_push_one(state.__x[7]);
+      GC_push_one(state.__x[8]);
+      GC_push_one(state.__x[9]);
+      GC_push_one(state.__x[10]);
+      GC_push_one(state.__x[11]);
+      GC_push_one(state.__x[12]);
+      GC_push_one(state.__x[13]);
+      GC_push_one(state.__x[14]);
+      GC_push_one(state.__x[15]);
+      GC_push_one(state.__x[16]);
+      GC_push_one(state.__x[17]);
+      GC_push_one(state.__x[18]);
+      GC_push_one(state.__x[19]);
+      GC_push_one(state.__x[20]);
+      GC_push_one(state.__x[21]);
+      GC_push_one(state.__x[22]);
+      GC_push_one(state.__x[23]);
+      GC_push_one(state.__x[24]);
+      GC_push_one(state.__x[25]);
+      GC_push_one(state.__x[26]);
+      GC_push_one(state.__x[27]);
+      GC_push_one(state.__x[28]);
+      GC_push_one(state.__fp);
+      GC_push_one(state.__lr);
+      /* GC_push_one(state.__sp); */
+      /* GC_push_one(state.__pc); */
+      /* GC_push_one(state.__cpsr); */
+
 #   else
 #     error FIXME for non-x86 || ppc || arm architectures
 #   endif
diff --git a/include/private/gc_priv.h b/include/private/gc_priv.h
index c4751d9b..ffbcc5ba 100644
--- a/include/private/gc_priv.h
+++ b/include/private/gc_priv.h
@@ -596,6 +596,10 @@ GC_EXTERN GC_warn_proc GC_current_warn_proc;
 #     define GC_MACH_THREAD_STATE       ARM_MACHINE_THREAD_STATE
 #     define GC_MACH_THREAD_STATE_COUNT ARM_MACHINE_THREAD_STATE_COUNT
 #   endif
+# elif defined(AARCH64)
+#   define GC_THREAD_STATE_T            arm_thread_state64_t
+#   define GC_MACH_THREAD_STATE         ARM_THREAD_STATE64
+#   define GC_MACH_THREAD_STATE_COUNT   ARM_THREAD_STATE64_COUNT
 # else
 #   error define GC_THREAD_STATE_T
 # endif
diff --git a/include/private/gcconfig.h b/include/private/gcconfig.h
index 989a7343..e5df5c09 100644
--- a/include/private/gcconfig.h
+++ b/include/private/gcconfig.h
@@ -97,7 +97,7 @@
 # endif
 # if defined(__aarch64__)
 #    define AARCH64
-#    if !defined(LINUX)
+#    if !defined(LINUX) && !defined(DARWIN)
 #      define NOSYS
 #      define mach_type_known
 #    endif
@@ -372,6 +372,10 @@
 #    define ARM32
 #    define mach_type_known
 #    define DARWIN_DONT_PARSE_STACK
+#   elif defined(__aarch64__)
+#    define AARCH64
+#    define mach_type_known
+#    define DARWIN_DONT_PARSE_STACK
 #   endif
 # endif
 # if defined(__rtems__) && (defined(i386) || defined(__i386__))
@@ -2040,6 +2044,29 @@
       extern char _end[];
 #     define DATAEND ((ptr_t)(&_end))
 #   endif
+#   ifdef DARWIN
+      /* iOS */
+#     define OS_TYPE "DARWIN"
+#     ifndef GC_DONT_REGISTER_MAIN_STATIC_DATA
+#       define DYNAMIC_LOADING
+#     endif
+#     define DATASTART ((ptr_t) get_etext())
+#     define DATAEND   ((ptr_t) get_end())
+#     define STACKBOTTOM ((ptr_t) 0x16fdfffff)
+#     ifndef USE_MMAP
+#       define USE_MMAP
+#     endif
+#     define USE_MMAP_ANON
+#     define MPROTECT_VDB
+#     include <unistd.h>
+#     define GETPAGESIZE() getpagesize()
+      /* FIXME: There seems to be some issues with trylock hanging on   */
+      /* darwin. This should be looked into some more.                  */
+#     define NO_PTHREAD_TRYLOCK
+#     ifndef NO_DYLD_BIND_FULLY_IMAGE
+#       define NO_DYLD_BIND_FULLY_IMAGE
+#     endif
+#   endif
 #   ifdef NOSYS
       /* __data_start is usually defined in the target linker script.   */
       extern int __data_start[];