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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.
.586
.model flat
option casemap:none
.code
include AsmMacros.inc
ifdef FEATURE_DYNAMIC_CODE
;;;;;;;;;;;;;;;;;;;;;;; CallingConventionConverter Thunks Helpers ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;------------------------------------------------------------------------------
; This helper routine enregisters the appropriate arguments and makes the
; actual call.
;------------------------------------------------------------------------------
; void __fastcall CallDescrWorker(CallDescrWorkerParams * pParams)
FASTCALL_FUNC RhCallDescrWorker, 4
push ebp
mov ebp, esp
push ebx
mov ebx, ecx
mov ecx, [ebx + OFFSETOF__CallDescrData__numStackSlots]
mov eax, [ebx + OFFSETOF__CallDescrData__pSrc] ; copy the stack
test ecx, ecx
jz donestack
lea eax, [eax + 4 * ecx - 4] ; last argument
push dword ptr [eax]
dec ecx
jz donestack
sub eax, 4
push dword ptr [eax]
dec ecx
jz donestack
stackloop:
sub eax, 4
push dword ptr [eax]
dec ecx
jnz stackloop
donestack:
; now we must push each field of the ArgumentRegister structure
mov eax, [ebx + OFFSETOF__CallDescrData__pArgumentRegisters]
mov edx, dword ptr [eax]
mov ecx, dword ptr [eax + 4]
mov eax,[ebx + OFFSETOF__CallDescrData__pTarget]
call eax
EXPORT_POINTER_TO_ADDRESS _PointerToReturnFromCallDescrThunk
; Symbol used to identify thunk call to managed function so the special
; case unwinder can unwind through this function. Sadly we cannot directly
; export this symbol right now because it confuses DIA unwinder to believe
; it's the beginning of a new method, therefore we export the address
; by means of an auxiliary variable.
; Save FP return value if necessary
mov ecx, [ebx + OFFSETOF__CallDescrData__fpReturnSize]
cmp ecx, 0
je ReturnsInt
cmp ecx, 4
je ReturnsFloat
cmp ecx, 8
je ReturnsDouble
; unexpected
jmp Epilog
ReturnsInt:
; Unlike desktop returnValue is a pointer to a return buffer, not the buffer itself
mov ebx, [ebx + OFFSETOF__CallDescrData__pReturnBuffer]
mov [ebx], eax
mov [ebx + 4], edx
Epilog:
pop ebx
pop ebp
retn
ReturnsFloat:
mov ebx, [ebx + OFFSETOF__CallDescrData__pReturnBuffer]
fstp dword ptr [ebx] ; Spill the Float return value
jmp Epilog
ReturnsDouble:
mov ebx, [ebx + OFFSETOF__CallDescrData__pReturnBuffer]
fstp qword ptr [ebx] ; Spill the Double return value
jmp Epilog
FASTCALL_ENDFUNC
endif
end
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