# HG changeset patch
# User Bernhard Urban <bernhard.urban@jku.at>
# Date 1417613344 -3600
# Node ID d806707624bbdf5910a42d0d750b530781883545
# Parent  95ec1f6723ac3133116612c0dedbc9cbc0b9dfbc
amd64 register config: reserve "home space" on windows in frame.

diff -r 95ec1f6723ac -r d806707624bb graal/com.oracle.graal.hotspot.amd64/src/com/oracle/graal/hotspot/amd64/AMD64HotSpotRegisterConfig.java
--- a/graal/com.oracle.graal.hotspot.amd64/src/com/oracle/graal/hotspot/amd64/AMD64HotSpotRegisterConfig.java	Wed Dec 03 09:53:46 2014 +0100
+++ b/graal/com.oracle.graal.hotspot.amd64/src/com/oracle/graal/hotspot/amd64/AMD64HotSpotRegisterConfig.java	Wed Dec 03 14:29:04 2014 +0100
@@ -90,6 +90,12 @@
     private final Register[] nativeGeneralParameterRegisters;
     private final Register[] xmmParameterRegisters = {xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7};
 
+    /*
+     * Some ABIs (e.g. Windows) require a so-called "home space", that is a save area on the stack
+     * to store the argument registers
+     */
+    private final boolean needsNativeStackHomeSpace;
+
     private final CalleeSaveLayout csl;
 
     private static Register findRegister(String name, Register[] all) {
@@ -143,9 +149,11 @@
         if (config.windowsOs) {
             javaGeneralParameterRegisters = new Register[]{rdx, r8, r9, rdi, rsi, rcx};
             nativeGeneralParameterRegisters = new Register[]{rcx, rdx, r8, r9};
+            this.needsNativeStackHomeSpace = true;
         } else {
             javaGeneralParameterRegisters = new Register[]{rsi, rdx, rcx, r8, r9, rdi};
             nativeGeneralParameterRegisters = new Register[]{rdi, rsi, rdx, rcx, r8, r9};
+            this.needsNativeStackHomeSpace = false;
         }
 
         csl = null;
@@ -199,7 +207,7 @@
 
         int currentGeneral = 0;
         int currentXMM = 0;
-        int currentStackOffset = 0;
+        int currentStackOffset = type == Type.NativeCall && needsNativeStackHomeSpace ? generalParameterRegisters.length * target.wordSize : 0;
 
         for (int i = 0; i < parameterTypes.length; i++) {
             final Kind kind = parameterTypes[i].getKind();