libphobos: Handle Darwin Arm and AArch64 in fibre context asm.

This code currently fails to build because it contains ELF-
specific directives.  This patch excludes those directives when
the platform is Darwin.

We do not expect switching fibres between threads to be safe here
either owing to the possible caching of TLS pointers.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

libphobos/ChangeLog:

	* libdruntime/config/aarch64/switchcontext.S: Exclude ELF-
	specific constructs for Darwin.
	* libdruntime/config/arm/switchcontext.S: Likewise.
	* libdruntime/core/thread/fiber.d: Disable switching fibres
	between threads.

3 files changed, 17 insertions, 1 deletions

diff --git a/libphobos/libdruntime/config/aarch64/switchcontext.S b/libphobos/libdruntime/config/aarch64/switchcontext.S
index 5cfa2f6..d3bd646 100644
--- a/libphobos/libdruntime/config/aarch64/switchcontext.S
+++ b/libphobos/libdruntime/config/aarch64/switchcontext.S
@@ -44,7 +44,9 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  */
     .text
     .global CSYM(fiber_switchContext)
+#ifndef __APPLE__
     .type CSYM(fiber_switchContext), %function
+#endif
     .align 4
 CSYM(fiber_switchContext):
     .cfi_startproc
@@ -77,8 +79,9 @@ CSYM(fiber_switchContext):
     ldp     d15, d14, [sp], #20*8
     ret
     .cfi_endproc
+#ifndef __APPLE__
     .size CSYM(fiber_switchContext),.-CSYM(fiber_switchContext)
-
+#endif
 /**
  * When generating any kind of backtrace (gdb, exception handling) for
  * a function called in a Fiber, we need to tell the unwinder to stop
@@ -93,11 +96,15 @@ CSYM(fiber_switchContext):
     .text
     .global CSYM(fiber_trampoline)
     .p2align  2
+#ifndef __APPLE__
     .type CSYM(fiber_trampoline), %function
+#endif
 CSYM(fiber_trampoline):
     .cfi_startproc
     .cfi_undefined x30
     // fiber_entryPoint never returns
     bl CSYM(fiber_entryPoint)
     .cfi_endproc
+#ifndef __APPLE__
     .size CSYM(fiber_trampoline),.-CSYM(fiber_trampoline)
+#endif
diff --git a/libphobos/libdruntime/config/arm/switchcontext.S b/libphobos/libdruntime/config/arm/switchcontext.S
index 3f9b35e..f1f2060 100644
--- a/libphobos/libdruntime/config/arm/switchcontext.S
+++ b/libphobos/libdruntime/config/arm/switchcontext.S
@@ -60,11 +60,15 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  */
 
     .text
+#ifndef __APPLE__
 #if defined(__ARM_PCS_VFP) || (defined(__ARM_PCS) && !defined(__SOFTFP__))
     .fpu vfp
 #endif
     .global CSYM(fiber_switchContext)
     .type CSYM(fiber_switchContext), %function
+#else
+    .global CSYM(fiber_switchContext)
+#endif
     .align 4
 CSYM(fiber_switchContext):
     .cfi_sections .debug_frame
@@ -111,8 +115,12 @@ CSYM(fiber_switchContext):
     mov lr, #0
     // return by writing lr into pc
     mov pc, r1
+#ifndef __APPLE__
     .fnend
     .cfi_endproc
     .size CSYM(fiber_switchContext),.-CSYM(fiber_switchContext)
+#else
+    .cfi_endproc
+#endif
 
 #endif
diff --git a/libphobos/libdruntime/core/thread/fiber.d b/libphobos/libdruntime/core/thread/fiber.d
index 4590ff1..66fb9da 100644
--- a/libphobos/libdruntime/core/thread/fiber.d
+++ b/libphobos/libdruntime/core/thread/fiber.d
@@ -1785,6 +1785,7 @@ version (OSX)
 {
     version (X86)    version = UnsafeFiberMigration;
     version (X86_64) version = UnsafeFiberMigration;
+    version (AArch64) version = UnsafeFiberMigration;
 }
 
 version (UnsafeFiberMigration)