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// 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.
.intel_syntax noprefix
#include "unixasmmacros.inc"
#include "asmconstants.h"
//
// eax = UMEntryThunk*
//
NESTED_ENTRY TheUMEntryPrestub, _TEXT, UnhandledExceptionHandlerUnix
push eax // UMEntryThunk*
call C_FUNC(TheUMEntryPrestubWorker)
add esp, 4
// eax = PCODE
jmp eax // Tail Jmp
NESTED_END TheUMEntryPrestub, _TEXT
//
// eax: UMEntryThunk*
//
NESTED_ENTRY UMThunkStub, _TEXT, UnhandledExceptionHandlerUnix
#define UMThunkStub_SAVEDREG (3*4) // ebx, esi, edi
#define UMThunkStub_LOCALVARS (2*4) // UMEntryThunk*, Thread*
#define UMThunkStub_UMENTRYTHUNK_OFFSET (UMThunkStub_SAVEDREG+4)
#define UMThunkStub_THREAD_OFFSET (UMThunkStub_UMENTRYTHUNK_OFFSET+4)
#define UMThunkStub_INT_ARG_OFFSET (UMThunkStub_THREAD_OFFSET+4)
#define UMThunkStub_FIXEDALLOCSIZE (UMThunkStub_LOCALVARS+4) // extra 4 is for stack alignment
// return address <-- entry ESP
// saved ebp <-- EBP
// saved ebx
// saved esi
// saved edi
// UMEntryThunk*
// Thread*
// dummy 4 byte for 16 byte stack alignment
// {optional stack args passed to callee} <-- new esp
PROLOG_BEG
PROLOG_PUSH ebx
PROLOG_PUSH esi
PROLOG_PUSH edi
PROLOG_END
sub esp, UMThunkStub_FIXEDALLOCSIZE
mov dword ptr [ebp - UMThunkStub_UMENTRYTHUNK_OFFSET], eax
call C_FUNC(GetThread)
test eax, eax
jz LOCAL_LABEL(DoThreadSetup)
LOCAL_LABEL(HaveThread):
mov dword ptr [ebp - UMThunkStub_THREAD_OFFSET], eax
// FailFast if a native callable method is invoked via ldftn and calli.
cmp dword ptr [eax + Thread_m_fPreemptiveGCDisabled], 1
jz LOCAL_LABEL(InvalidTransition)
// disable preemptive GC
mov dword ptr [eax + Thread_m_fPreemptiveGCDisabled], 1
// catch returning thread here if a GC is in progress
PREPARE_EXTERNAL_VAR g_TrapReturningThreads, eax
cmp eax, 0
jnz LOCAL_LABEL(DoTrapReturningThreadsTHROW)
LOCAL_LABEL(InCooperativeMode):
#if _DEBUG
mov eax, dword ptr [ebp - UMThunkStub_THREAD_OFFSET]
mov eax, dword ptr [eax + Thread__m_pDomain]
mov esi, dword ptr [eax + AppDomain__m_dwId]
mov eax, dword ptr [ebp - UMThunkStub_UMENTRYTHUNK_OFFSET]
mov edi, dword ptr [eax + UMEntryThunk__m_dwDomainId]
cmp esi, edi
jne LOCAL_LABEL(WrongAppDomain)
#endif
mov eax, dword ptr [ebp - UMThunkStub_UMENTRYTHUNK_OFFSET]
mov ebx, dword ptr [eax + UMEntryThunk__m_pUMThunkMarshInfo]
mov eax, dword ptr [ebx + UMThunkMarshInfo__m_cbActualArgSize]
test eax, eax
jnz LOCAL_LABEL(UMThunkStub_CopyStackArgs)
LOCAL_LABEL(UMThunkStub_ArgumentsSetup):
mov eax, dword ptr [ebp - UMThunkStub_UMENTRYTHUNK_OFFSET]
mov ebx, dword ptr [eax + UMEntryThunk__m_pUMThunkMarshInfo]
mov ebx, dword ptr [ebx + UMThunkMarshInfo__m_pILStub]
call ebx
LOCAL_LABEL(PostCall):
mov ebx, dword ptr [ebp - UMThunkStub_THREAD_OFFSET]
mov dword ptr [ebx + Thread_m_fPreemptiveGCDisabled], 0
lea esp, [ebp - UMThunkStub_SAVEDREG] // deallocate arguments
EPILOG_BEG
EPILOG_POP edi
EPILOG_POP esi
EPILOG_POP ebx
EPILOG_END
ret
LOCAL_LABEL(DoThreadSetup):
call C_FUNC(CreateThreadBlockThrow)
jmp LOCAL_LABEL(HaveThread)
LOCAL_LABEL(InvalidTransition):
//No arguments to setup , ReversePInvokeBadTransition will failfast
call C_FUNC(ReversePInvokeBadTransition)
LOCAL_LABEL(DoTrapReturningThreadsTHROW):
// extern "C" VOID STDCALL UMThunkStubRareDisableWorker(Thread *pThread, UMEntryThunk *pUMEntryThunk)
sub esp, (2*4) // add padding to ensure 16 byte stack alignment
mov eax, dword ptr [ebp - UMThunkStub_UMENTRYTHUNK_OFFSET]
push eax
mov eax, dword ptr [ebp - UMThunkStub_THREAD_OFFSET]
push eax
call C_FUNC(UMThunkStubRareDisableWorker)
add esp, (2*4) // restore to before stack alignment
jmp LOCAL_LABEL(InCooperativeMode)
LOCAL_LABEL(UMThunkStub_CopyStackArgs):
// eax = m_cbActualArgSize, in bytes
// esi = src
// edi = dest
// ebx = scratch
lea esi, [ebp + 0x08]
// first [esi] goes to ecx, in LTR
add eax, -4
mov ecx, dword ptr [esi]
jz LOCAL_LABEL(UMThunkStub_ArgumentsSetup)
// second [esi+04] goes to edx
add eax, -4
mov edx, dword ptr [esi + 0x04]
jz LOCAL_LABEL(UMThunkStub_ArgumentsSetup)
sub esp, eax
and esp, -16 // align with 16 byte
lea edi, [esp]
LOCAL_LABEL(CopyLoop):
// copy rest of the arguments to [esp+08+n], in RTL
add eax, -4
mov ebx, dword ptr [esi + 0x08 + eax]
mov dword ptr [edi + eax], ebx
jnz LOCAL_LABEL(CopyLoop)
jmp LOCAL_LABEL(UMThunkStub_ArgumentsSetup)
#if _DEBUG
LOCAL_LABEL(WrongAppDomain):
int3
#endif
NESTED_END UMThunkStub, _TEXT
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