1 // Copyright (c) 2008-2009 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".
8 // Initial Contributors:
9 // Nokia Corporation - initial contribution.
14 // e32/include/nkern/arm/entry.h
20 extern void __ArmVectorReset();
21 extern void __ArmVectorUndef();
22 extern void __ArmVectorSwi();
23 extern void __ArmVectorAbortPrefetch();
24 extern void __ArmVectorAbortData();
25 extern void __ArmVectorReserved();
26 extern void __ArmVectorIrq();
27 extern void __ArmVectorFiq();
29 #define __DECLARE_UNDEFINED_INSTRUCTION_HANDLER asm(".word __ArmVectorUndef ")
30 #define __DECLARE_PREFETCH_ABORT_HANDLER asm(".word __ArmVectorAbortPrefetch ")
31 #define __DECLARE_DATA_ABORT_HANDLER asm(".word __ArmVectorAbortData ")
33 /* NOTE: We must ensure that this code goes at the beginning of the kernel image.
35 __NAKED__ void __this_must_go_at_the_beginning_of_the_kernel_image()
37 asm("ldr pc, __reset_vector "); // 00 = Reset vector
38 asm("ldr pc, __undef_vector "); // 04 = Undefined instruction vector
39 asm("ldr pc, __swi_vector "); // 08 = SWI vector
40 asm("ldr pc, __pabt_vector "); // 0C = Prefetch abort vector
41 asm("ldr pc, __dabt_vector "); // 10 = Data abort vector
42 asm("ldr pc, __unused_vector "); // 14 = unused
43 asm("b HandleIrq "); // 18 = IRQ vector
44 // 1C = FIQ vector, code in situ
45 asm("ldr r12, __ArmInterrupt "); // THIS MUST BE AN IDEMPOTENT INSTRUCTION TO AVOID A PROBLEM WITH XSCALE PXA255
46 asm("sub lr, lr, #4 ");
47 asm("str lr, [sp, #-4]! ");
48 // we assume FIQ handler preserves r0-r7 but not r8-r12
49 // hence must be assembler, so stack misalignment OK
50 #if defined(__CPU_ARM_HAS_WORKING_CLREX)
52 #elif defined(__CPU_ARM_HAS_LDREX_STREX)
53 STREX(8,14, 13); // dummy STREX to reset exclusivity monitor
55 #ifdef __USER_MEMORY_GUARDS_ENABLED__
56 USER_MEMORY_GUARD_ON(,lr,r8);
57 asm("str lr, [sp, #-4]! ");
59 #ifdef BTRACE_CPU_USAGE
60 asm("ldrb r8, [r12,#%a0]" : : "i" _FOFF(SArmInterruptInfo,iCpuUsageFilter));
61 asm("ldr lr, _ArmVectorFiq ");
62 asm("mov r10, #%a0" : : "i" ((TInt)(BTrace::ECpuUsage<<BTrace::ECategoryIndex*8)+(BTrace::EFiqStart<<BTrace::ESubCategoryIndex*8)) );
64 asm("bne btrace_fiq");
65 asm("ldr pc, [r12,#%a0]" : : "i" _FOFF(SArmInterruptInfo,iFiqHandler)); // call FIQ handler, return to ArmVectorFiq
67 asm("btrace_fiq:"); // call trace handler before fiq handler...
68 asm("stmdb sp!, {r0-r3} ");
69 asm("add r0, r10, #%a0" : : "i" ((TInt)4) ); // add size of trace into header
71 asm("ldr pc, [r12,#%a0]" : : "i" _FOFF(SArmInterruptInfo,iBTraceHandler));
72 asm("ldr r12, __ArmInterrupt ");
73 asm("ldmia sp!, {r0-r3} ");
75 asm("ldr lr, _ArmVectorFiq ");
76 asm("ldr pc, [r12,#%a0]" : : "i" _FOFF(SArmInterruptInfo,iFiqHandler)); // call FIQ handler, return to ArmVectorFiq
79 asm("sub lr, lr, #4 ");
80 asm("stmfd sp!, {r0-r3,r12,lr} ");
81 #if defined(__CPU_ARM_HAS_WORKING_CLREX)
83 #elif defined(__CPU_ARM_HAS_LDREX_STREX)
84 STREX(12, 0, 13); // dummy STREX to reset exclusivity monitor
86 #ifdef __USER_MEMORY_GUARDS_ENABLED__
87 USER_MEMORY_GUARD_ON(,lr,r12);
88 asm("str lr, [sp, #-8]! ");
90 asm("ldr r12, __ArmInterrupt ");
91 #ifdef BTRACE_CPU_USAGE
92 asm("mov r0, #%a0" : : "i" ((TInt)(BTrace::ECpuUsage<<BTrace::ECategoryIndex*8)+(BTrace::EIrqStart<<BTrace::ESubCategoryIndex*8)) );
93 asm("add r0, r0, #%a0" : : "i" ((TInt)4) ); // add size of trace into header
94 asm("ldrb r1, [r12,#%a0]" : : "i" _FOFF(SArmInterruptInfo,iCpuUsageFilter));
95 asm("ldr lr, _ArmVectorIrq ");
97 asm("bne btrace_irq");
98 asm("ldr pc, [r12,#%a0]" : : "i" _FOFF(SArmInterruptInfo,iIrqHandler)); // call IRQ handler, return to ArmVectorIrq
100 asm("btrace_irq:"); // call trace handler before irq handler...
102 asm("ldr pc, [r12,#%a0]" : : "i" _FOFF(SArmInterruptInfo,iBTraceHandler));
103 asm("ldr r12, __ArmInterrupt ");
105 asm("ldr lr, _ArmVectorIrq ");
106 asm("ldr pc, [r12,#%a0]" : : "i" _FOFF(SArmInterruptInfo,iIrqHandler)); // call IRQ handler, return to ArmVectorIrq
108 asm("__reset_vector:");
109 asm(".word __ArmVectorReset ");
110 asm("__undef_vector:");
111 __DECLARE_UNDEFINED_INSTRUCTION_HANDLER;
112 asm("__swi_vector:");
113 asm(".word __ArmVectorSwi ");
114 asm("__pabt_vector:");
115 __DECLARE_PREFETCH_ABORT_HANDLER;
116 asm("__dabt_vector:");
117 __DECLARE_DATA_ABORT_HANDLER;
118 asm("__unused_vector:");
119 asm(".word __ArmVectorReserved ");
121 asm("__ArmInterrupt: ");
122 asm(".word ArmInterruptInfo ");
123 asm("_ArmVectorIrq:");
124 asm(".word __ArmVectorIrq");
125 asm("_ArmVectorFiq:");
126 asm(".word __ArmVectorFiq ");