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// Copyright (c) 1995-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of the License "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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// e32\euser\epoc\arm\eka1_entry_stub.cia
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//
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//
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#include <e32cia.h>
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#include <u32std.h>
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#include <e32base.h>
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#include <e32rom.h>
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#include <e32svr.h>
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#include <u32exec.h>
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// Entry point stub to allow EKA1 binaries to be executed under EKA2
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extern "C" void RunV7Thread(TBool aNotFirst, SThreadCreateInfo& aInfo);
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extern "C" EXPORT_C __NAKED__ void Eka1ExeEntryStub()
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{
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// Process entry point
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// R4 = entry reason
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// SP points to information block
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asm("cmp r4, #%a0" : : "i" ((TInt)KModuleEntryReasonThreadInit) );
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asm("movls r0, r4 "); // r0 = aNotFirst
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asm("movls r1, sp "); // r1 -> parameter block
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asm("bls RunV7Thread "); // process or thread init
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asm("cmp r4, #%a0" : : "i" ((TInt)KModuleEntryReasonException) );
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asm("bne " CSM_ZN4User9InvariantEv ); // invalid entry reason
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// exception entry
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// !! stack layout not same as v7 !!
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asm("mov r0, sp "); // r0->parameter block
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asm("bl " CSM_ZN4User15HandleExceptionEPv );
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asm("ldr r0, [sp, #16] "); // r0 = saved CPSR
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asm("add sp, sp, #20 "); // skip exc type, exc code, FAR, FSR, CPSR
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#ifdef __SUPPORT_THUMB_INTERWORKING
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asm("tst r0, #0x20 "); // test for THUMB
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asm("bic r0, r0, #0x20 "); // clear THUMB bit
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asm("bne 1f "); // branch if THUMB
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#endif
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asm("msr cpsr, r0 "); // restore flags
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asm("ldmia sp, {r0-r15} "); // restore r0-r15
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#ifdef __SUPPORT_THUMB_INTERWORKING
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asm("1: "); // want to return in THUMB state
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asm("msr cpsr, r0 "); // restore flags
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asm("ldmia sp!, {r0-r12} "); // restore r0-r12
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asm("ldr lr, [sp, #4]! "); // skip saved r13, restore r14
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asm("str r0, [sp, #0] "); // push r0 again
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asm("add r0, pc, #1 "); // r0 = . + 8 + 1
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asm("bx r0 "); // go to next instruction in THUMB
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asm(".code 16 "); // get here in THUMB state
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asm("pop {r0,pc} "); // restore r0 and return in THUMB state
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asm("nop "); // pad
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asm(".code 32 ");
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#endif
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}
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