From c1a3d8f4705c50c88ad018e64d1b332e4104dd14 Mon Sep 17 00:00:00 2001
From: David Chisnall <github@theravensnest.org>
Date: Thu, 22 Aug 2019 15:12:52 +0100
Subject: [PATCH] Fix stack resetting for objc_msgSend on ARM.

If we called into C to find the IMP (e.g. for forwarding), we were then
reloading all of the arguments but failing to adjust the stack pointer
by the correct amount, leaving it around 192 bytes offset from its
correct location.  This, unsurprisingly, led to crashing and other
exciting behaviour.
---
 objc_msgSend.aarch64.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/objc_msgSend.aarch64.S b/objc_msgSend.aarch64.S
index 31b6b52..6d0b327 100644
--- a/objc_msgSend.aarch64.S
+++ b/objc_msgSend.aarch64.S
@@ -76,7 +76,7 @@
 	ldp    q4, q5, [sp, #144]
 	ldp    q6, q7, [sp, #176]
 	ldp    fp, lr, [sp, #208]
-	ldp    \receiver, x8, [sp], #16
+	ldp    \receiver, x8, [sp], #(ARGUMENT_SPILL_SIZE + 16)
 	br     x9
 6:
 	adr    x10, SmallObjectClasses