1 files changed, 111 insertions, 0 deletions
diff --git a/src/vm/i386/PInvokeStubs.asm b/src/vm/i386/PInvokeStubs.asm
new file mode 100644
index 0000000000..7295c568e7
--- /dev/null
+++ b/src/vm/i386/PInvokeStubs.asm
@@ -0,0 +1,111 @@
+; Licensed to the .NET Foundation under one or more agreements.
+; The .NET Foundation licenses this file to you under the MIT license.
+; See the LICENSE file in the project root for more information.
+
+; ***********************************************************************
+; File: PInvokeStubs.asm
+;
+; ***********************************************************************
+;
+;  *** NOTE:  If you make changes to this file, propagate the changes to
+;             PInvokeStubs.s in this directory                            
+
+; This contains JITinterface routines that are 100% x86 assembly
+
+        .586
+        .model  flat
+
+        include asmconstants.inc
+        include asmmacros.inc
+
+        option  casemap:none
+        .code
+        
+extern _s_gsCookie:DWORD
+extern ??_7InlinedCallFrame@@6B@:DWORD
+extern _g_TrapReturningThreads:DWORD
+
+extern @JIT_PInvokeEndRarePath@0:proc
+
+.686P
+.XMM
+
+;
+; in:
+; InlinedCallFrame (ecx) = pointer to the InlinedCallFrame data, including the GS cookie slot (GS cookie right 
+;                          before actual InlinedCallFrame data)
+;
+;
+_JIT_PInvokeBegin@4 PROC public
+        
+        mov             eax, dword ptr [_s_gsCookie]
+        mov             dword ptr [ecx], eax
+        add             ecx, SIZEOF_GSCookie
+
+        ;; set first slot to the value of InlinedCallFrame::`vftable' (checked by runtime code)
+        lea             eax,[??_7InlinedCallFrame@@6B@]
+        mov             dword ptr [ecx], eax
+
+        mov             dword ptr [ecx + InlinedCallFrame__m_Datum], 0
+
+        
+        mov             eax, esp
+        add             eax, 4
+        mov             dword ptr [ecx + InlinedCallFrame__m_pCallSiteSP], eax
+        mov             dword ptr [ecx + InlinedCallFrame__m_pCalleeSavedFP], ebp
+
+        mov             eax, [esp]
+        mov             dword ptr [ecx + InlinedCallFrame__m_pCallerReturnAddress], eax
+
+        ;; edx = GetThread(). Trashes eax
+        INLINE_GETTHREAD edx, eax
+
+        ;; pFrame->m_Next = pThread->m_pFrame;
+        mov             eax, dword ptr [edx + Thread_m_pFrame]
+        mov             dword ptr [ecx + Frame__m_Next], eax
+
+        ;; pThread->m_pFrame = pFrame;
+        mov             dword ptr [edx + Thread_m_pFrame], ecx
+
+        ;; pThread->m_fPreemptiveGCDisabled = 0
+        mov             dword ptr [edx + Thread_m_fPreemptiveGCDisabled], 0
+
+        ret
+
+_JIT_PInvokeBegin@4 ENDP
+
+;
+; in:
+; InlinedCallFrame (ecx) = pointer to the InlinedCallFrame data, including the GS cookie slot (GS cookie right 
+;                          before actual InlinedCallFrame data)
+;
+;
+_JIT_PInvokeEnd@4 PROC public
+
+        add             ecx, SIZEOF_GSCookie
+
+        ;; edx = GetThread(). Trashes eax
+        INLINE_GETTHREAD edx, eax
+
+        ;; ecx = pFrame
+        ;; edx = pThread
+
+        ;; pThread->m_fPreemptiveGCDisabled = 1
+        mov             dword ptr [edx + Thread_m_fPreemptiveGCDisabled], 1
+
+        ;; Check return trap
+        cmp             [_g_TrapReturningThreads], 0
+        jnz             RarePath
+
+        ;; pThread->m_pFrame = pFrame->m_Next
+        mov             eax, dword ptr [ecx + Frame__m_Next]
+        mov             dword ptr [edx + Thread_m_pFrame], eax
+
+        ret
+
+RarePath:
+        jmp             @JIT_PInvokeEndRarePath@0
+
+_JIT_PInvokeEnd@4 ENDP
+
+        end