2013-01-25 12:28:06 +01:00
|
|
|
#------------------------------------------------------------------------------
|
|
|
|
|
#
|
|
|
|
|
# Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
|
|
|
|
|
#
|
|
|
|
|
# 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 3
|
|
|
|
|
|
|
|
|
|
GCC_ASM_EXPORT(ExceptionHandlersStart)
|
|
|
|
|
GCC_ASM_EXPORT(ExceptionHandlersEnd)
|
|
|
|
|
GCC_ASM_EXPORT(CommonExceptionEntry)
|
|
|
|
|
GCC_ASM_EXPORT(AsmCommonExceptionEntry)
|
|
|
|
|
GCC_ASM_EXPORT(CommonCExceptionHandler)
|
|
|
|
|
|
|
|
|
|
ASM_PFX(ExceptionHandlersStart):
|
|
|
|
|
|
|
|
|
|
ASM_PFX(Reset):
|
|
|
|
|
b ASM_PFX(ResetEntry)
|
|
|
|
|
|
|
|
|
|
ASM_PFX(UndefinedInstruction):
|
|
|
|
|
b ASM_PFX(UndefinedInstructionEntry)
|
|
|
|
|
|
|
|
|
|
ASM_PFX(SoftwareInterrupt):
|
|
|
|
|
b ASM_PFX(SoftwareInterruptEntry)
|
|
|
|
|
|
|
|
|
|
ASM_PFX(PrefetchAbort):
|
|
|
|
|
b ASM_PFX(PrefetchAbortEntry)
|
|
|
|
|
|
|
|
|
|
ASM_PFX(DataAbort):
|
|
|
|
|
b ASM_PFX(DataAbortEntry)
|
|
|
|
|
|
|
|
|
|
ASM_PFX(ReservedException):
|
|
|
|
|
b ASM_PFX(ReservedExceptionEntry)
|
|
|
|
|
|
|
|
|
|
ASM_PFX(Irq):
|
|
|
|
|
b ASM_PFX(IrqEntry)
|
|
|
|
|
|
|
|
|
|
ASM_PFX(Fiq):
|
|
|
|
|
b ASM_PFX(FiqEntry)
|
|
|
|
|
|
|
|
|
|
ASM_PFX(ResetEntry):
|
|
|
|
|
srsdb #0x13! @ Store return state on SVC stack
|
|
|
|
|
stmfd SP!,{LR} @ Store the link register for the current mode
|
|
|
|
|
sub SP,SP,#0x20 @ Save space for SP, LR, PC, IFAR - CPSR
|
|
|
|
|
stmfd SP!,{R0-R12} @ Store the register state
|
|
|
|
|
|
|
|
|
|
mov R0,#0
|
|
|
|
|
ldr R1,ASM_PFX(CommonExceptionEntry)
|
|
|
|
|
bx R1
|
|
|
|
|
|
|
|
|
|
ASM_PFX(UndefinedInstructionEntry):
|
|
|
|
|
srsdb #0x13! @ Store return state on SVC stack
|
|
|
|
|
cps #0x13 @ Switch to SVC for common stack
|
|
|
|
|
stmfd SP!,{LR} @ Store the link register for the current mode
|
|
|
|
|
sub SP,SP,#0x20 @ Save space for SP, LR, PC, IFAR - CPSR
|
|
|
|
|
stmfd SP!,{R0-R12} @ Store the register state
|
|
|
|
|
|
|
|
|
|
mov r0,#1
|
|
|
|
|
ldr r1,ASM_PFX(CommonExceptionEntry)
|
|
|
|
|
bx r1
|
|
|
|
|
|
|
|
|
|
ASM_PFX(SoftwareInterruptEntry):
|
|
|
|
|
srsdb #0x13! @ Store return state on SVC stack
|
|
|
|
|
stmfd SP!,{LR} @ Store the link register for the current mode
|
|
|
|
|
sub SP,SP,#0x20 @ Save space for SP, LR, PC, IFAR - CPSR
|
|
|
|
|
stmfd SP!,{R0-R12} @ Store the register state
|
|
|
|
|
|
|
|
|
|
mov r0,#2
|
|
|
|
|
ldr r1,ASM_PFX(CommonExceptionEntry)
|
|
|
|
|
bx r1
|
|
|
|
|
|
|
|
|
|
ASM_PFX(PrefetchAbortEntry):
|
|
|
|
|
sub LR,LR,#4
|
|
|
|
|
srsdb #0x13! @ Store return state on SVC stack
|
|
|
|
|
cps #0x13 @ Switch to SVC for common stack
|
|
|
|
|
stmfd SP!,{LR} @ Store the link register for the current mode
|
|
|
|
|
sub SP,SP,#0x20 @ Save space for SP, LR, PC, IFAR - CPSR
|
|
|
|
|
stmfd SP!,{R0-R12} @ Store the register state
|
|
|
|
|
|
|
|
|
|
mov r0,#3
|
|
|
|
|
ldr r1,ASM_PFX(CommonExceptionEntry)
|
|
|
|
|
bx r1
|
|
|
|
|
|
|
|
|
|
ASM_PFX(DataAbortEntry):
|
|
|
|
|
sub LR,LR,#8
|
|
|
|
|
srsdb #0x13! @ Store return state on SVC stack
|
|
|
|
|
cps #0x13 @ Switch to SVC for common stack
|
|
|
|
|
stmfd SP!,{LR} @ Store the link register for the current mode
|
|
|
|
|
sub SP,SP,#0x20 @ Save space for SP, LR, PC, IFAR - CPSR
|
|
|
|
|
stmfd SP!,{R0-R12} @ Store the register state
|
|
|
|
|
|
|
|
|
|
mov r0,#4
|
|
|
|
|
ldr r1,ASM_PFX(CommonExceptionEntry)
|
|
|
|
|
bx r1
|
|
|
|
|
|
|
|
|
|
ASM_PFX(ReservedExceptionEntry):
|
|
|
|
|
srsdb #0x13! @ Store return state on SVC stack
|
|
|
|
|
cps #0x13 @ Switch to SVC for common stack
|
|
|
|
|
stmfd SP!,{LR} @ Store the link register for the current mode
|
|
|
|
|
sub SP,SP,#0x20 @ Save space for SP, LR, PC, IFAR - CPSR
|
|
|
|
|
stmfd SP!,{R0-R12} @ Store the register state
|
|
|
|
|
|
|
|
|
|
mov r0,#5
|
|
|
|
|
ldr r1,ASM_PFX(CommonExceptionEntry)
|
|
|
|
|
bx r1
|
|
|
|
|
|
|
|
|
|
ASM_PFX(IrqEntry):
|
|
|
|
|
sub LR,LR,#4
|
|
|
|
|
srsdb #0x13! @ Store return state on SVC stack
|
|
|
|
|
cps #0x13 @ Switch to SVC for common stack
|
|
|
|
|
stmfd SP!,{LR} @ Store the link register for the current mode
|
|
|
|
|
sub SP,SP,#0x20 @ Save space for SP, LR, PC, IFAR - CPSR
|
|
|
|
|
stmfd SP!,{R0-R12} @ Store the register state
|
|
|
|
|
|
|
|
|
|
mov r0,#6
|
|
|
|
|
ldr r1,ASM_PFX(CommonExceptionEntry)
|
|
|
|
|
bx r1
|
|
|
|
|
|
|
|
|
|
ASM_PFX(FiqEntry):
|
|
|
|
|
sub LR,LR,#4
|
|
|
|
|
srsdb #0x13! @ Store return state on SVC stack
|
|
|
|
|
cps #0x13 @ Switch to SVC for common stack
|
|
|
|
|
stmfd SP!,{LR} @ Store the link register for the current mode
|
|
|
|
|
sub SP,SP,#0x20 @ Save space for SP, LR, PC, IFAR - CPSR
|
|
|
|
|
stmfd SP!,{R0-R12} @ Store the register state
|
|
|
|
|
|
|
|
|
|
mov r0,#7
|
|
|
|
|
ldr r1,ASM_PFX(CommonExceptionEntry)
|
|
|
|
|
bx r1
|
|
|
|
|
|
|
|
|
|
ASM_PFX(CommonExceptionEntry):
|
|
|
|
|
.byte 0x12
|
|
|
|
|
.byte 0x34
|
|
|
|
|
.byte 0x56
|
|
|
|
|
.byte 0x78
|
|
|
|
|
|
|
|
|
|
ASM_PFX(ExceptionHandlersEnd):
|
|
|
|
|
|
|
|
|
|
ASM_PFX(AsmCommonExceptionEntry):
|
|
|
|
|
mrc p15, 0, R1, c6, c0, 2 @ Read IFAR
|
|
|
|
|
str R1, [SP, #0x50] @ Store it in EFI_SYSTEM_CONTEXT_ARM.IFAR
|
|
|
|
|
|
|
|
|
|
mrc p15, 0, R1, c5, c0, 1 @ Read IFSR
|
|
|
|
|
str R1, [SP, #0x4c] @ Store it in EFI_SYSTEM_CONTEXT_ARM.IFSR
|
|
|
|
|
|
|
|
|
|
mrc p15, 0, R1, c6, c0, 0 @ Read DFAR
|
|
|
|
|
str R1, [SP, #0x48] @ Store it in EFI_SYSTEM_CONTEXT_ARM.DFAR
|
|
|
|
|
|
|
|
|
|
mrc p15, 0, R1, c5, c0, 0 @ Read DFSR
|
|
|
|
|
str R1, [SP, #0x44] @ Store it in EFI_SYSTEM_CONTEXT_ARM.DFSR
|
|
|
|
|
|
|
|
|
|
ldr R1, [SP, #0x5c] @ srsdb saved pre-exception CPSR on the stack
|
|
|
|
|
str R1, [SP, #0x40] @ Store it in EFI_SYSTEM_CONTEXT_ARM.CPSR
|
|
|
|
|
and r1, r1, #0x1f @ Check to see if User or System Mode
|
|
|
|
|
cmp r1, #0x1f
|
|
|
|
|
cmpne r1, #0x10
|
|
|
|
|
add R2, SP, #0x38 @ Store it in EFI_SYSTEM_CONTEXT_ARM.LR
|
|
|
|
|
ldmneed r2, {lr}^ @ User or System mode, use unbanked register
|
|
|
|
|
ldmneed r2, {lr} @ All other modes used banked register
|
|
|
|
|
|
|
|
|
|
ldr R1, [SP, #0x58] @ PC is the LR pushed by srsdb
|
|
|
|
|
str R1, [SP, #0x3c] @ Store it in EFI_SYSTEM_CONTEXT_ARM.PC
|
|
|
|
|
|
|
|
|
|
sub R1, SP, #0x60 @ We pused 0x60 bytes on the stack
|
|
|
|
|
str R1, [SP, #0x34] @ Store it in EFI_SYSTEM_CONTEXT_ARM.SP
|
|
|
|
|
|
|
|
|
|
@ R0 is exception type
|
|
|
|
|
mov R1,SP @ Prepare System Context pointer as an argument for the exception handler
|
|
|
|
|
blx ASM_PFX(CommonCExceptionHandler) @ Call exception handler
|
|
|
|
|
|
|
|
|
|
ldr R2,[SP,#0x40] @ EFI_SYSTEM_CONTEXT_ARM.CPSR
|
|
|
|
|
str R2,[SP,#0x5c] @ Store it back to srsdb stack slot so it can be restored
|
|
|
|
|
|
|
|
|
|
ldr R2,[SP,#0x3c] @ EFI_SYSTEM_CONTEXT_ARM.PC
|
|
|
|
|
str R2,[SP,#0x58] @ Store it back to srsdb stack slot so it can be restored
|
|
|
|
|
|
|
|
|
|
ldmfd SP!,{R0-R12} @ Restore general purpose registers
|
|
|
|
|
@ Exception handler can not change SP or LR as we would blow chunks
|
|
|
|
|
|
|
|
|
|
add SP,SP,#0x20 @ Clear out the remaining stack space
|
|
|
|
|
ldmfd SP!,{LR} @ restore the link register for this context
|
|
|
|
|
rfefd SP! @ return from exception via srsdb stack slot
|
