From 5e7223504d356cbb48c397bed0cd0012eb075935 Mon Sep 17 00:00:00 2001
From: Cliff Click <cliffc@acm.org>
Date: Mon, 14 Apr 2025 10:42:50 -0700
Subject: win64 shadow stack killed by calls

---
 .../java/com/seaofnodes/simple/node/cpus/x86_64_v2/x86_64_v2.java  | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/chapter21/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/x86_64_v2.java b/chapter21/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/x86_64_v2.java
index 53671eae..b8688f53 100644
--- a/chapter21/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/x86_64_v2.java
+++ b/chapter21/src/main/java/com/seaofnodes/simple/node/cpus/x86_64_v2/x86_64_v2.java
@@ -316,7 +316,12 @@ public class x86_64_v2 extends Machine {
         (1L<<FLAGS)|           // Flags are killed
         // Only XMM0-XMM5 are killed; XMM6-XMM15 are preserved
         (1L<<XMM0) | (1L<<XMM1) | (1L<<XMM2) | (1L<<XMM3) |
-        (1L<<XMM4) | (1L<<XMM5);
+        (1L<<XMM4) | (1L<<XMM5) |
+        // Shadow arg space is killed by caller: 1st 4 stack slots past RPC
+        (1L<<(MAX_REG+1))  |
+        (1L<<(MAX_REG+2))  |
+        (1L<<(MAX_REG+3))  |
+        (1L<<(MAX_REG+4))  ;
     static final RegMask WIN64_CALLER_SAVE_MASK = new RegMask(WIN64_CALLER_SAVE);
 
     static RegMask x86CallerSave() {
-- 
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