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1 // Copyright (c) 1995-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of the License "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // e32\euser\epoc\arm\eka1_entry_stub.cia |
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15 // |
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16 // |
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17 |
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18 #include <e32cia.h> |
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19 #include <u32std.h> |
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20 #include <e32base.h> |
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21 #include <e32rom.h> |
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22 #include <e32svr.h> |
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23 #include <u32exec.h> |
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24 |
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25 |
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26 // Entry point stub to allow EKA1 binaries to be executed under EKA2 |
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27 |
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28 extern "C" void RunV7Thread(TBool aNotFirst, SThreadCreateInfo& aInfo); |
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29 |
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30 extern "C" EXPORT_C __NAKED__ void Eka1ExeEntryStub() |
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31 { |
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32 // Process entry point |
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33 // R4 = entry reason |
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34 // SP points to information block |
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35 asm("cmp r4, #%a0" : : "i" ((TInt)KModuleEntryReasonThreadInit) ); |
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36 asm("movls r0, r4 "); // r0 = aNotFirst |
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37 asm("movls r1, sp "); // r1 -> parameter block |
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38 asm("bls RunV7Thread "); // process or thread init |
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39 asm("cmp r4, #%a0" : : "i" ((TInt)KModuleEntryReasonException) ); |
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40 asm("bne " CSM_ZN4User9InvariantEv ); // invalid entry reason |
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41 |
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42 // exception entry |
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43 // !! stack layout not same as v7 !! |
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44 asm("mov r0, sp "); // r0->parameter block |
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45 asm("bl " CSM_ZN4User15HandleExceptionEPv ); |
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46 asm("ldr r0, [sp, #16] "); // r0 = saved CPSR |
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47 asm("add sp, sp, #20 "); // skip exc type, exc code, FAR, FSR, CPSR |
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48 #ifdef __SUPPORT_THUMB_INTERWORKING |
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49 asm("tst r0, #0x20 "); // test for THUMB |
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50 asm("bic r0, r0, #0x20 "); // clear THUMB bit |
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51 asm("bne 1f "); // branch if THUMB |
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52 #endif |
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53 asm("msr cpsr, r0 "); // restore flags |
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54 asm("ldmia sp, {r0-r15} "); // restore r0-r15 |
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55 #ifdef __SUPPORT_THUMB_INTERWORKING |
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56 asm("1: "); // want to return in THUMB state |
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57 asm("msr cpsr, r0 "); // restore flags |
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58 asm("ldmia sp!, {r0-r12} "); // restore r0-r12 |
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59 asm("ldr lr, [sp, #4]! "); // skip saved r13, restore r14 |
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60 asm("str r0, [sp, #0] "); // push r0 again |
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61 asm("add r0, pc, #1 "); // r0 = . + 8 + 1 |
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62 asm("bx r0 "); // go to next instruction in THUMB |
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63 asm(".code 16 "); // get here in THUMB state |
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64 asm("pop {r0,pc} "); // restore r0 and return in THUMB state |
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65 asm("nop "); // pad |
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66 asm(".code 32 "); |
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67 #endif |
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68 } |
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69 |