Remove AppDomain unload (#20250)

* Remove AppDomain unload

This change removes all code in AppDomain that's related to AppDomain
unloading which is obsolete in CoreCLR. It also removes all calls to the
removed methods.
In few places, I have made the change simpler by taking into account the
fact that there is always just one AppDomain.

3 files changed, 4 insertions, 51 deletions

diff --git a/src/vm/i386/asmconstants.h b/src/vm/i386/asmconstants.h
index 70f6e30c4a..e17cec7227 100644
--- a/src/vm/i386/asmconstants.h
+++ b/src/vm/i386/asmconstants.h
@@ -175,7 +175,7 @@ ASMCONSTANTS_C_ASSERT(CORINFO_ArgumentException_ASM == CORINFO_ArgumentException
 #ifndef CROSSGEN_COMPILE
 
 // from clr/src/vm/threads.h
-#define Thread_m_Context    0x38
+#define Thread_m_Context    0x34
 ASMCONSTANTS_C_ASSERT(Thread_m_Context == offsetof(Thread, m_Context))
 
 #define Thread_m_State      0x04
@@ -193,10 +193,10 @@ ASMCONSTANTS_C_ASSERT(Thread_m_pFrame == offsetof(Thread, m_pFrame))
 #endif // CROSSGEN_COMPILE
 
 #ifndef CROSSGEN_COMPILE
-#define Thread_m_dwLockCount 0x18
+#define Thread_m_dwLockCount 0x14
 ASMCONSTANTS_C_ASSERT(Thread_m_dwLockCount == offsetof(Thread, m_dwLockCount))
 
-#define Thread_m_ThreadId 0x1C
+#define Thread_m_ThreadId 0x18
 ASMCONSTANTS_C_ASSERT(Thread_m_ThreadId == offsetof(Thread, m_ThreadId))
 
 #ifdef FEATURE_HIJACK
@@ -338,7 +338,7 @@ ASMCONSTANTS_C_ASSERT(UMThunkMarshInfo__m_cbRetPop == offsetof(UMThunkMarshInfo,
 #endif //FEATURE_STUBS_AS_IL
 
 #ifndef CROSSGEN_COMPILE
-#define               Thread__m_pDomain                     0x14
+#define               Thread__m_pDomain                     0x10
 ASMCONSTANTS_C_ASSERT(Thread__m_pDomain == offsetof(Thread, m_pDomain));
 
 #endif
diff --git a/src/vm/i386/asmhelpers.S b/src/vm/i386/asmhelpers.S
index 2052088f51..09fb50266f 100644
--- a/src/vm/i386/asmhelpers.S
+++ b/src/vm/i386/asmhelpers.S
@@ -555,28 +555,6 @@ LEAF_ENTRY PrecodeFixupThunk, _TEXT
     jmp     C_FUNC(ThePreStub)
 LEAF_END PrecodeFixupThunk, _TEXT
 
-// void __stdcall UM2MThunk_WrapperHelper(void *pThunkArgs,
-//                                        int argLen,
-//                                        void *pAddr,
-//                                        UMEntryThunk *pEntryThunk,
-//                                        Thread *pThread)
-NESTED_ENTRY UM2MThunk_WrapperHelper, _TEXT, NoHandler
-    push    ebx
-
-    mov     eax, [esp + 20] // pEntryThunk
-    mov     ecx, [esp + 24] // pThread
-    mov     ebx, [esp + 8]  // pThunkArgs
-
-    sub     esp, 8
-    CHECK_STACK_ALIGNMENT
-    call    [esp + 16 + 8]      // pAddr
-    add     esp, 8
-
-    pop     ebx
-
-    ret     20
-NESTED_END UM2MThunk_WrapperHelper, _TEXT
-
 NESTED_ENTRY UMThunkStubRareDisable, _TEXT, NoHandler
     push    eax
     push    ecx
diff --git a/src/vm/i386/asmhelpers.asm b/src/vm/i386/asmhelpers.asm
index 17d521fb92..18b5c6eb98 100644
--- a/src/vm/i386/asmhelpers.asm
+++ b/src/vm/i386/asmhelpers.asm
@@ -926,31 +926,6 @@ getFPReturn4:
    retn    8
 _getFPReturn@8 endp
 
-; void __stdcall UM2MThunk_WrapperHelper(void *pThunkArgs,
-;                                        int argLen,
-;                                        void *pAddr,
-;                                        UMEntryThunk *pEntryThunk,
-;                                        Thread *pThread)
-UM2MThunk_WrapperHelper proc stdcall public,
-                        pThunkArgs : DWORD,
-                        argLen : DWORD,
-                        pAddr : DWORD,
-                        pEntryThunk : DWORD,
-                        pThread : DWORD
-    UNREFERENCED argLen
-
-    push    ebx
-
-    mov     eax, pEntryThunk
-    mov     ecx, pThread
-    mov     ebx, pThunkArgs
-    call    pAddr
-
-    pop     ebx
-
-    ret
-UM2MThunk_WrapperHelper endp
-
 ; VOID __cdecl UMThunkStubRareDisable()
 ;<TODO>
 ; @todo: this is very similar to StubRareDisable