+++ /dev/null
-#------------------------------------------------------------------------------
-#
-# Copyright (c) 2008-2009 Apple Inc. All rights reserved.
-#
-# All rights reserved. This program and the accompanying materials
-# are licensed and made available under the terms and conditions of the BSD License
-# which accompanies this distribution. The full text of the license may be found at
-# http://opensource.org/licenses/bsd-license.php
-#
-# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
-# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
-#
-#------------------------------------------------------------------------------
-
-.text
-.align 2
-
-.globl _ExceptionHandlersStart
-.globl _ExceptionHandlersEnd
-.globl _CommonExceptionEntry
-.globl _AsmCommonExceptionEntry
-.globl _gExceptionHandlers
-
-_ExceptionHandlersStart:
-
-_Reset:
- b _ResetEntry
-
-_UndefinedInstruction:
- b _UndefinedInstructionEntry
-
-_SoftwareInterrupt:
- b _SoftwareInterruptEntry
-
-_PrefetchAbort:
- b _PrefetchAbortEntry
-
-_DataAbort:
- b _DataAbortEntry
-
-_ReservedException:
- b _ReservedExceptionEntry
-
-_Irq:
- b _IrqEntry
-
-_Fiq:
- b _FiqEntry
-
-_ResetEntry:
- stmfd sp!,{r0-r1}
- mov r0,#0
- ldr r1,_CommonExceptionEntry
- bx r1
-
-_UndefinedInstructionEntry:
- stmfd sp!,{r0-r1}
- mov r0,#1
- ldr r1,_CommonExceptionEntry
- bx r1
-
-_SoftwareInterruptEntry:
- stmfd sp!,{r0-r1}
- mov r0,#2
- ldr r1,_CommonExceptionEntry
- bx r1
-
-_PrefetchAbortEntry:
- stmfd sp!,{r0-r1}
- mov r0,#3
- sub lr,lr,#4
- ldr r1,_CommonExceptionEntry
- bx r1
-
-_DataAbortEntry:
- stmfd sp!,{r0-r1}
- mov r0,#4
- sub lr,lr,#8
- ldr r1,_CommonExceptionEntry
- bx r1
-
-_ReservedExceptionEntry:
- stmfd sp!,{r0-r1}
- mov r0,#5
- ldr r1,_CommonExceptionEntry
- bx r1
-
-_IrqEntry:
- stmfd sp!,{r0-r1}
- mov r0,#6
- sub lr,lr,#4
- ldr r1,_CommonExceptionEntry
- bx r1
-
-_FiqEntry:
- stmfd sp!,{r0-r1}
- mov r0,#7
- sub lr,lr,#4
- ldr r1,_CommonExceptionEntry
- bx r1
-
-_CommonExceptionEntry:
- .byte 0x12
- .byte 0x34
- .byte 0x56
- .byte 0x78
-
-_ExceptionHandlersEnd:
-
-LIndirectgExceptionHandlers:
- .long _gExceptionHandlers
-
-_AsmCommonExceptionEntry:
- mrc p15, 0, r1, c6, c0, 2 @ Read IFAR
- stmfd sp!,{r1} @ Store the IFAR
-
- mrc p15, 0, r1, c5, c0, 1 @ Read IFSR
- stmfd sp!,{r1} @ Store the IFSR
-
- mrc p15, 0, r1, c6, c0, 0 @ Read DFAR
- stmfd sp!,{r1} @ Store the DFAR
-
- mrc p15, 0, r1, c5, c0, 0 @ Read DFSR
- stmfd sp!,{r1} @ Store the DFSR
-
- mrs r1,spsr @ Read SPSR (which is the pre-exception CPSR)
- stmfd sp!,{r1} @ Store the SPSR
-
- stmfd sp!,{lr} @ Store the link register (which is the pre-exception PC)
- stmfd sp,{sp,lr}^ @ Store user/system mode stack pointer and link register
- nop @ Required by ARM architecture
- sub sp,sp,#0x08 @ Adjust stack pointer
- stmfd sp!,{r2-r12} @ Store general purpose registers
-
- ldr r3,[sp,#0x40] @ Read saved R1 from the stack (it was saved by the exception entry routine)
- ldr r2,[sp,#0x3C] @ Read saved R0 from the stack (it was saved by the exception entry routine)
- stmfd sp!,{r2-r3} @ Store general purpose registers R0 and R1
-
- mov r1,sp @ Prepare System Context pointer as an argument for the exception handler
-
- ldr r2,LIndirectgExceptionHandlers @ Offset to 32-bit address of exception handler
- ldr r2,[r2] @ Load exception handler table
- ldr r3,[r2,r0,lsl #2] @ Index to find the handler for this exception
-
-// blx r3 @ Call exception handler
- bx r3 @ Call exception handler
-
- ldr r2,[sp,#0x40] @ Load CPSR from context, in case it has changed
- msr SPSR_cxsf,r2 @ Store it back to the SPSR to be restored when exiting this handler
-
- ldmfd sp!,{r0-r12} @ Restore general purpose registers
- ldmia sp,{sp,lr}^ @ Restore user/system mode stack pointer and link register
- nop @ Required by ARM architecture
- add sp,sp,#0x08 @ Adjust stack pointer
- ldmfd sp!,{lr} @ Restore the link register (which is the pre-exception PC)
- add sp,sp,#0x1C @ Clear out the remaining stack space
- movs pc,lr @ Return from exception
-
projects / mirror_edk2.git / blobdiff