[gcc r13-7527] libphobos: Handle Darwin Arm and AArch64 in fibre context asm.

[gcc r13-7527] libphobos: Handle Darwin Arm and AArch64 in fibre context asm.

[Iain D Sandoe]

https://gcc.gnu.org/g:50180d4afc430f03999685be4fa51125fab74fb1

commit r13-7527-g50180d4afc430f03999685be4fa51125fab74fb1
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Sun Jul 2 11:14:08 2023 +0100

    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.
    
    (cherry picked from commit 6757bf86142a61c7b4ebabb713d17231e86e12f7)

Diff:
---
 libphobos/libdruntime/config/aarch64/switchcontext.S | 9 ++++++++-
 libphobos/libdruntime/config/arm/switchcontext.S     | 8 ++++++++
 libphobos/libdruntime/core/thread/fiber.d            | 1 +
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/libphobos/libdruntime/config/aarch64/switchcontext.S b/libphobos/libdruntime/config/aarch64/switchcontext.S
index 5cfa2f698e8..d3bd646bc56 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 3f9b35e7334..f1f2060fd97 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 4590ff1c052..66fb9dad89d 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)