1 // Copyright (c) 1995-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of the License "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 // e32\euser\epoc\arm\uc_trp.cia

    15 // 

    16 //

    17 

    18 #include <e32cia.h>

    19 #include <u32std.h>

    20 #include <e32panic.h>

    21 #include <u32exec.h>

    22 #include "uc_std.h"

    23 

    24 //  With -fvtable-thunks

    25 const TInt KVTableTrapOffset=8;

    26 const TInt KVTableLeaveOffset=16;

    27 

    28 //  Without -fvtable-thunks

    29 //  const TInt KVTableTrapOffset=12;

    30 //  const TInt KVTableLeaveOffset=28;

    31 

    32 

    33 #ifndef __LEAVE_EQUALS_THROW__

    34 

    35 EXPORT_C __NAKED__ TInt TTrap::Trap(TInt & /*aResult*/)

    36 //

    37 // Save the enter frame state and return 0.

    38 //

    39 	{

    40 

    41 	asm("mov r2, #0 ");						// aResult==KErrNone

    42 	asm("str r2, [r1, #0] ");				// iResult=(&aResult)

    43 	asm("str r1, [r0, #%a0]" : : "i" _FOFF(TTrap,iResult));

    44 	asm("stmia r0, {r4-r11, sp, lr} ");		// Save the context

    45 	asm("stmfd sp!, {r4,lr} ");

    46 	asm("bl  " CSM_ZN4Exec13PushTrapFrameEP5TTrap);

    47 	asm("cmp r0, #0 ");						// == NULL

    48 	asm("ldrne r3, [r0, #%a0]" : : "i" (_TTRAPHANDLER_VPTR_OFFSET_));

    49 	asm("beq ttrap_trap_no_trap_handler ");

    50 #ifdef __SUPPORT_THUMB_INTERWORKING

    51 	asm("ldr r3, [r3, #%a0]" : : "i" (_TTRAPHANDLER_TRAP_OFFSET_));

    52 	asm("adr lr, __ttrap_trap_return ");	// iHandler->Trap()

    53 	asm("bx r3 ");

    54 #else

    55 	asm("adr lr, __ttrap_trap_return ");	// iHandler->Trap()

    56 	asm("ldr pc, [r3, #%a0]" : : "i" (_TTRAPHANDLER_TRAP_OFFSET_));

    57 #endif

    58 	asm("__ttrap_trap_return: ");

    59 	asm("mov r0, #0							");

    60 	asm("ttrap_trap_no_trap_handler: ");

    61 	__POPRET("r4,");

    62 	}

    63 

    64 extern void PanicNoTrapFrame();

    65 

    66 

    67 

    68 EXPORT_C __NAKED__ void User::Leave(TInt /*aReason*/)

    69 /**

    70 Leaves the currently executing function, unwinds the call stack, and returns

    71 from the most recently entered trap harness.

    72 

    73 @param aReason The value returned from the most recent call to TRAP or TRAPD.

    74                This is known as the reason code and, typically, it gives the

    75                reason for the environment or user error causing this leave

    76                to occur.

    77               

    78 @see TRAP

    79 @see TRAPD              

    80 */

    81 	{

    82 

    83 	asm("mov r4, r0 ");						// Save aReason

    84 	asm("bl  " CSM_ZN4Exec12PopTrapFrameEv);			// Returns the current TTrap

    85     asm("cmp r0, #0 ");

    86     asm("bleq  " CSM_Z16PanicNoTrapFramev);

    87 	asm("ldr r1, [r0, #%a0]" : : "i" _FOFF(TTrap,iResult));

    88 	asm("mov r5, r0 ");						// Save it for later

    89 	asm("ldr r0, [r0, #%a0]" : : "i" _FOFF(TTrap,iHandler));

    90 	asm("str r4, [r1, #0] ");				// *(pT->iResult)=aReason

    91 	asm("cmp r0, #0 ");

    92 	asm("ldrne r2, [r0, #%a0]" : : "i" (_TTRAPHANDLER_VPTR_OFFSET_));

    93 	asm("beq user_leave_no_trap_handler ");	// No trap handler

    94 	asm("mov r1, r4 ");						// Pass aReason

    95 #ifdef __SUPPORT_THUMB_INTERWORKING

    96 	asm("ldr r3, [r2, #%a0]" : : "i" (_TTRAPHANDLER_LEAVE_OFFSET_));

    97 	asm("adr lr, user_leave_no_trap_handler ");	// iHandler->Leave(aReason)

    98 	asm("bx r3 ");

    99 #else

   100 	asm("adr lr, user_leave_no_trap_handler ");	// iHandler->Leave(aReason)

   101 	asm("ldr pc, [r2, #%a0]" : : "i" (_TTRAPHANDLER_LEAVE_OFFSET_));

   102 #endif

   103 	asm("user_leave_no_trap_handler: ");

   104 	asm("ldmia	r5, {r4-r11, sp, lr} ");	// Restore the context

   105 	asm("mov	r0, #1 ");					// return(1)

   106 	__JUMP(,lr);							// return

   107 	}

   108 

   109 #endif // !__LEAVE_EQUALS_THROW__