From f335f738078a35dd48a0aaacbe58a0b7b11c86ce Mon Sep 17 00:00:00 2001
From: Iain Sandoe <iain@sandoe.co.uk>
Date: Tue, 18 Aug 2020 21:50:49 +0100
Subject: [PATCH] Darwin, Arm64 : Initial changes to libitm.

Just add Arm64 as a target and adjust the SjLj code to allow mach-o
assembler.
---
 libitm/config/aarch64/sjlj.S | 27 ++++++++++++++++++++++++++-
 libitm/configure.tgt         |  2 +-
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/libitm/config/aarch64/sjlj.S b/libitm/config/aarch64/sjlj.S
index c84e98aecad5..702a19f52e1e 100644
--- a/libitm/config/aarch64/sjlj.S
+++ b/libitm/config/aarch64/sjlj.S
@@ -57,10 +57,19 @@
 
 	.text
 	.align	2
+#if __ELF__
 	.global	_ITM_beginTransaction
 	.type	_ITM_beginTransaction, %function
 
 _ITM_beginTransaction:
+
+#elif __MACH__
+	.global	__ITM_beginTransaction
+
+__ITM_beginTransaction:
+
+#endif
+
 	cfi_startproc
 	CFI_PAC_KEY
 	PAC_AND_BTI
@@ -84,8 +93,13 @@ _ITM_beginTransaction:
 
 	/* Invoke GTM_begin_transaction with the struct we just built.  */
 	mov	x1, sp
+#if __ELF__
 	bl	GTM_begin_transaction
-
+#elif __MACH__
+	bl	_GTM_begin_transaction
+#else
+#error "unexpected object format"
+#endif
 	/* Return; we don't need to restore any of the call-saved regs.  */
 	ldp	x29, x30, [sp], 11*16
 	cfi_adjust_cfa_offset(-11*16)
@@ -95,14 +109,23 @@ _ITM_beginTransaction:
 	CFI_PAC_TOGGLE
 	ret
 	cfi_endproc
+#if __ELF__
 	.size	_ITM_beginTransaction, . - _ITM_beginTransaction
+#endif
 
 	.align	2
+#if __ELF__
 	.global	GTM_longjmp
 	.hidden	GTM_longjmp
 	.type	GTM_longjmp, %function
 
 GTM_longjmp:
+
+#elif __MACH__
+	.private_extern _GTM_longjmp
+
+_GTM_longjmp:
+#endif
 	/* The first parameter becomes the return value (x0).
 	   The third parameter is ignored for now.  */
 	cfi_startproc
@@ -126,7 +149,9 @@ GTM_longjmp:
 	CFI_PAC_TOGGLE
 	br	x30
 	cfi_endproc
+#if __ELF__
 	.size	GTM_longjmp, . - GTM_longjmp
+#endif
 
 /* GNU_PROPERTY_AARCH64_* macros from elf.h for use in asm code.  */
 #define FEATURE_1_AND 0xc0000000
diff --git a/libitm/configure.tgt b/libitm/configure.tgt
index d1beb5c9ec85..e0c952b6431b 100644
--- a/libitm/configure.tgt
+++ b/libitm/configure.tgt
@@ -50,7 +50,7 @@ fi
 # Map the target cpu to an ARCH sub-directory.  At the same time,
 # work out any special compilation flags as necessary.
 case "${target_cpu}" in
-  aarch64*)		ARCH=aarch64 ;;
+  aarch64* | arm64*)	ARCH=aarch64 ;;
   alpha*)		ARCH=alpha ;;
   rs6000 | powerpc*)
 	XCFLAGS="${XCFLAGS} -mhtm"