From ef161ab2bb87207f52c7db9472fd5a027dbe5f12 Mon Sep 17 00:00:00 2001
From: Rahul Kumar <rahku@microsoft.com>
Date: Wed, 20 Apr 2016 16:27:04 -0700
Subject: Enable ReadyToRun feature for arm64

---
 src/zap/zapimport.cpp | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)

(limited to 'src/zap/zapimport.cpp')

diff --git a/src/zap/zapimport.cpp b/src/zap/zapimport.cpp
index 4e7b151d74..98e7afee6a 100644
--- a/src/zap/zapimport.cpp
+++ b/src/zap/zapimport.cpp
@@ -2082,6 +2082,72 @@ DWORD ZapIndirectHelperThunk::SaveWorker(ZapWriter * pZapWriter)
     // bx r12
     *(WORD *)p = 0x4760;
     p += 2;
+#elif defined(_TARGET_ARM64_)
+    if (IsDelayLoadHelper())
+    {
+        if (IsVSD())
+        {
+			// x11 contains indirection cell
+			// Do nothing x11 contains our first param
+        }
+        else
+        {
+            // mov x11, x12
+			*(DWORD*)p = 0xaa0c03eb;
+			p += 4;
+        }
+
+        //  movz x8, #index
+		DWORD index = GetSectionIndex();
+		_ASSERTE(index <= 0x7F);
+		*(DWORD*)p = 0xd2800008 | (index << 5);
+		p += 4;
+
+        // move Module* -> x9
+		// ldr x9, [PC+0x14]
+		*(DWORD*)p = 0x58000289;
+		p += 4;
+		
+		//ldr x9, [x9]
+		*(DWORD*)p = 0xf9400129;
+		p += 4;
+	}
+    else
+    if (IsLazyHelper())
+    {
+		// Move Module* -> x1
+        // ldr x1, [PC+0x14]
+		*(DWORD*)p = 0x58000289;
+		p += 4;
+
+		// ldr x1, [x1]
+		*(DWORD*)p = 0xf9400021;
+		p += 4;
+	}
+
+    // branch to helper
+	
+    // mov x12, [helper]
+	// ldr x12, [PC+0x14]
+	*(DWORD*)p = 0x58000289;
+	p += 4;
+
+    // ldr x12, [x12]
+    *(DWORD *)p = 0xf940018c;
+    p += 4;
+
+    // br x12
+    *(DWORD *)p = 0xd61f0180;
+    p += 4;	
+
+	// [Module*]
+	if (pImage != NULL)
+		pImage->WriteReloc(buffer, (int)(p - buffer), pImage->GetImportTable()->GetHelperImport(READYTORUN_HELPER_Module), 0, IMAGE_REL_BASED_PTR);
+	p += 8;
+    // [helper]
+	if (pImage != NULL)
+		pImage->WriteReloc(buffer, (int)(p - buffer), pImage->GetImportTable()->GetHelperImport(GetReadyToRunHelper()), 0, IMAGE_REL_BASED_PTR);
+	p += 8;
 #else
     PORTABILITY_ASSERT("ZapIndirectHelperThunk::SaveWorker");
 #endif
-- 
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