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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.
// ===========================================================================
// File: JITHelpersARM.CPP
// ===========================================================================
// This contains JITinterface routines that are specific to the
// ARM platform. They are modeled after the AMD64 specific routines
// found in JIThelpersAMD64.cpp
#include "common.h"
#include "jitinterface.h"
#include "eeconfig.h"
#include "excep.h"
#include "ecall.h"
#include "asmconstants.h"
EXTERN_C void JIT_TailCallHelperStub_ReturnAddress();
TailCallFrame * TailCallFrame::GetFrameFromContext(CONTEXT * pContext)
{
_ASSERTE((void*)::GetIP(pContext) == JIT_TailCallHelperStub_ReturnAddress);
return (TailCallFrame*)(pContext->R7 - offsetof(TailCallFrame, m_calleeSavedRegisters));
}
// Assuming pContext is a plain generic call-site, adjust it to look like
// it called into TailCallHelperStub, and is at the point of the call.
TailCallFrame * TailCallFrame::AdjustContextForTailCallHelperStub(CONTEXT * pContext, size_t cbNewArgArea, Thread * pThread)
{
TailCallFrame * pNewFrame = (TailCallFrame *) (GetSP(pContext) - sizeof(TailCallFrame));
// The return addres for the pseudo-call
pContext->Lr = (DWORD_PTR)JIT_TailCallHelperStub_ReturnAddress;
// The R11/ETW chain 'frame' pointer
pContext->R11 = GetSP(pContext) - (2 * sizeof(DWORD)); // LR & R11
// The unwind data frame pointer
pContext->R7 = pContext->R11 - (7 * sizeof(DWORD)); // r4-R10 non-volatile registers
// for the args and the remainder of the FrameWithCookie<TailCallFrame>
SetSP(pContext, (size_t) pNewFrame - (cbNewArgArea + sizeof(GSCookie)));
// For popping the Frame, store the Thread
pContext->R6 = (DWORD_PTR)pThread;
// And the current head/top
pContext->R5 = (DWORD_PTR)pThread->GetFrame();
return pNewFrame;
}
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