mirror of https://github.com/acidanthera/audk.git
153 lines
4.8 KiB
ArmAsm
153 lines
4.8 KiB
ArmAsm
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#------------------------------------------------------------------------------
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#
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# Copyright (c) 2008-2009 Apple Inc. All rights reserved.
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#
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# All rights reserved. This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php
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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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#------------------------------------------------------------------------------
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.text
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.align 3
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.globl ASM_PFX(ExceptionHandlersStart)
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.globl ASM_PFX(ExceptionHandlersEnd)
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.globl ASM_PFX(CommonExceptionEntry)
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.globl ASM_PFX(AsmCommonExceptionEntry)
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.globl ASM_PFX(CommonCExceptionHandler)
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ASM_PFX(ExceptionHandlersStart):
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ASM_PFX(Reset):
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b ASM_PFX(ResetEntry)
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ASM_PFX(UndefinedInstruction):
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b ASM_PFX(UndefinedInstructionEntry)
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ASM_PFX(SoftwareInterrupt):
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b ASM_PFX(SoftwareInterruptEntry)
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ASM_PFX(PrefetchAbort):
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b ASM_PFX(PrefetchAbortEntry)
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ASM_PFX(DataAbort):
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b ASM_PFX(DataAbortEntry)
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ASM_PFX(ReservedException):
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b ASM_PFX(ReservedExceptionEntry)
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ASM_PFX(Irq):
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b ASM_PFX(IrqEntry)
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ASM_PFX(Fiq):
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b ASM_PFX(FiqEntry)
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ASM_PFX(ResetEntry):
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stmfd sp!,{r0-r1}
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mov r0,#0
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ldr r1,ASM_PFX(CommonExceptionEntry)
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bx r1
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ASM_PFX(UndefinedInstructionEntry):
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stmfd sp!,{r0-r1}
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mov r0,#1
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ldr r1,ASM_PFX(CommonExceptionEntry)
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bx r1
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ASM_PFX(SoftwareInterruptEntry):
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stmfd sp!,{r0-r1}
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mov r0,#2
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ldr r1,ASM_PFX(CommonExceptionEntry)
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bx r1
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ASM_PFX(PrefetchAbortEntry):
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stmfd sp!,{r0-r1}
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mov r0,#3
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sub lr,lr,#4
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ldr r1,ASM_PFX(CommonExceptionEntry)
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bx r1
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ASM_PFX(DataAbortEntry):
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stmfd sp!,{r0-r1}
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mov r0,#4
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sub lr,lr,#8
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ldr r1,ASM_PFX(CommonExceptionEntry)
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bx r1
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ASM_PFX(ReservedExceptionEntry):
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stmfd sp!,{r0-r1}
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mov r0,#5
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ldr r1,ASM_PFX(CommonExceptionEntry)
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bx r1
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ASM_PFX(IrqEntry):
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stmfd sp!,{r0-r1}
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mov r0,#6
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sub lr,lr,#4
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ldr r1,ASM_PFX(CommonExceptionEntry)
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bx r1
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ASM_PFX(FiqEntry):
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stmfd sp!,{r0-r1}
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mov r0,#7
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sub lr,lr,#4
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ldr r1,ASM_PFX(CommonExceptionEntry)
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bx r1
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ASM_PFX(CommonExceptionEntry):
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.byte 0x12
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.byte 0x34
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.byte 0x56
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.byte 0x78
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ASM_PFX(ExceptionHandlersEnd):
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ASM_PFX(AsmCommonExceptionEntry):
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mrc p15, 0, r1, c6, c0, 2 @ Read IFAR
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stmfd sp!,{r1} @ Store the IFAR
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mrc p15, 0, r1, c5, c0, 1 @ Read IFSR
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stmfd sp!,{r1} @ Store the IFSR
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mrc p15, 0, r1, c6, c0, 0 @ Read DFAR
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stmfd sp!,{r1} @ Store the DFAR
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mrc p15, 0, r1, c5, c0, 0 @ Read DFSR
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stmfd sp!,{r1} @ Store the DFSR
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mrs r1,spsr @ Read SPSR (which is the pre-exception CPSR)
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stmfd sp!,{r1} @ Store the SPSR
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stmfd sp!,{lr} @ Store the link register (which is the pre-exception PC)
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stmfd sp,{sp,lr}^ @ Store user/system mode stack pointer and link register
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nop @ Required by ARM architecture
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sub sp,sp,#0x08 @ Adjust stack pointer
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stmfd sp!,{r2-r12} @ Store general purpose registers
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ldr r3,[sp,#0x50] @ Read saved R1 from the stack (it was saved by the exception entry routine)
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ldr r2,[sp,#0x4C] @ Read saved R0 from the stack (it was saved by the exception entry routine)
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stmfd sp!,{r2-r3} @ Store general purpose registers R0 and R1
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mov r1,sp @ Prepare System Context pointer as an argument for the exception handler
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sub sp,sp,#4 @ Adjust SP to preserve 8-byte alignment
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bl ASM_PFX(CommonCExceptionHandler) @ Call exception handler
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add sp,sp,#4 @ Adjust SP back to where we were
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ldr r2,[sp,#0x40] @ Load CPSR from context, in case it has changed
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msr SPSR_cxsf,r2 @ Store it back to the SPSR to be restored when exiting this handler
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ldmfd sp!,{r0-r12} @ Restore general purpose registers
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ldmia sp,{sp,lr}^ @ Restore user/system mode stack pointer and link register
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nop @ Required by ARM architecture
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add sp,sp,#0x08 @ Adjust stack pointer
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ldmfd sp!,{lr} @ Restore the link register (which is the pre-exception PC)
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add sp,sp,#0x1C @ Clear out the remaining stack space
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movs pc,lr @ Return from exception
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