Add the beginning of a GDB based Debug Agent. IA-32 and X64 don't have low level interrupt code yet. I've been testing on ARM.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10334 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
258
EmbeddedPkg/Library/GdbDebugAgent/Arm/ExceptionSupport.ARMv6.S
Executable file
258
EmbeddedPkg/Library/GdbDebugAgent/Arm/ExceptionSupport.ARMv6.S
Executable file
@ -0,0 +1,258 @@
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#------------------------------------------------------------------------------
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#
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# Use ARMv6 instruction to operate on a single stack
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#
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# Copyright (c) 2008-2010 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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/*
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This is the stack constructed by the exception handler (low address to high address)
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# R0 - IFAR is EFI_SYSTEM_CONTEXT for ARM
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Reg Offset
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=== ======
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R0 0x00 # stmfd SP!,{R0-R12}
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R1 0x04
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R2 0x08
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R3 0x0c
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R4 0x10
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R5 0x14
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R6 0x18
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R7 0x1c
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R8 0x20
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R9 0x24
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R10 0x28
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R11 0x2c
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R12 0x30
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SP 0x34 # reserved via adding 0x20 (32) to the SP
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LR 0x38
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PC 0x3c
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CPSR 0x40
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DFSR 0x44
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DFAR 0x48
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IFSR 0x4c
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IFAR 0x50
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LR 0x54 # SVC Link register (we need to restore it)
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LR 0x58 # pushed by srsfd
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CPSR 0x5c
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*/
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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(GdbExceptionHandler)
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.text
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.align 3
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//
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// This code gets copied to the ARM vector table
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// ExceptionHandlersStart - ExceptionHandlersEnd gets copied
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//
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ASM_PFX(ExceptionHandlersStart):
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ASM_PFX(Reset):
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b ASM_PFX(Reset)
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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(Irq)
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ASM_PFX(Fiq):
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b ASM_PFX(FiqEntry)
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ASM_PFX(UndefinedInstructionEntry):
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sub LR, LR, #4 @ Only -2 for Thumb, adjust in CommonExceptionEntry
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srsdb #0x13! @ Store return state on SVC stack
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cps #0x13 @ Switch to SVC for common stack
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stmfd SP!,{LR} @ Store the link register for the current mode
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sub SP,SP,#0x20 @ Save space for SP, LR, PC, IFAR - CPSR
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stmfd SP!,{R0-R12} @ Store the register state
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mov R0,#1 @ ExceptionType
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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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sub LR, LR, #4 @ Only -2 for Thumb, adjust in CommonExceptionEntry
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srsdb #0x13! @ Store return state on SVC stack
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@ We are already in SVC mode
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stmfd SP!,{LR} @ Store the link register for the current mode
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sub SP,SP,#0x20 @ Save space for SP, LR, PC, IFAR - CPSR
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stmfd SP!,{R0-R12} @ Store the register state
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mov R0,#2 @ ExceptionType
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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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sub LR,LR,#4
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srsdb #0x13! @ Store return state on SVC stack
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cps #0x13 @ Switch to SVC for common stack
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stmfd SP!,{LR} @ Store the link register for the current mode
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sub SP,SP,#0x20 @ Save space for SP, LR, PC, IFAR - CPSR
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stmfd SP!,{R0-R12} @ Store the register state
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mov R0,#3 @ ExceptionType
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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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sub LR,LR,#8
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srsdb #0x13! @ Store return state on SVC stack
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cps #0x13 @ Switch to SVC for common stack
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stmfd SP!,{LR} @ Store the link register for the current mode
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sub SP,SP,#0x20 @ Save space for SP, LR, PC, IFAR - CPSR
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stmfd SP!,{R0-R12} @ Store the register state
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mov R0,#4
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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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srsdb #0x13! @ Store return state on SVC stack
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cps #0x13 @ Switch to SVC for common stack
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stmfd SP!,{LR} @ Store the link register for the current mode
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sub SP,SP,#0x20 @ Save space for SP, LR, PC, IFAR - CPSR
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stmfd SP!,{R0-R12} @ Store the register state
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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(FiqEntry):
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sub LR,LR,#4
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srsdb #0x13! @ Store return state on SVC stack
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cps #0x13 @ Switch to SVC for common stack
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stmfd SP!,{LR} @ Store the link register for the current mode
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sub SP,SP,#0x20 @ Save space for SP, LR, PC, IFAR - CPSR
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stmfd SP!,{R0-R12} @ Store the register state
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@ Since we have already switch to SVC R8_fiq - R12_fiq
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@ never get used or saved
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mov R0,#7 @ ExceptionType
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ldr R1,ASM_PFX(CommonExceptionEntry)
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bx R1
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//
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// This gets patched by the C code that patches in the vector table
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//
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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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//
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// This code runs from CpuDxe driver loaded address. It is patched into
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// CommonExceptionEntry.
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//
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ASM_PFX(AsmCommonExceptionEntry):
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mrc p15, 0, R1, c6, c0, 2 @ Read IFAR
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str R1, [SP, #0x50] @ Store it in EFI_SYSTEM_CONTEXT_ARM.IFAR
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mrc p15, 0, R1, c5, c0, 1 @ Read IFSR
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str R1, [SP, #0x4c] @ Store it in EFI_SYSTEM_CONTEXT_ARM.IFSR
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mrc p15, 0, R1, c6, c0, 0 @ Read DFAR
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str R1, [SP, #0x48] @ Store it in EFI_SYSTEM_CONTEXT_ARM.DFAR
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mrc p15, 0, R1, c5, c0, 0 @ Read DFSR
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str R1, [SP, #0x44] @ Store it in EFI_SYSTEM_CONTEXT_ARM.DFSR
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ldr R1, [SP, #0x5c] @ srsdb saved pre-exception CPSR on the stack
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str R1, [SP, #0x40] @ Store it in EFI_SYSTEM_CONTEXT_ARM.CPSR
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add R2, SP, #0x38 @ Make R2 point to EFI_SYSTEM_CONTEXT_ARM.LR
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and R3, R1, #0x1f @ Check CPSR to see if User or System Mode
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cmp R3, #0x1f @ if ((CPSR == 0x10) || (CPSR == 0x1df))
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cmpne R3, #0x10 @
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stmeqed R2, {lr}^ @ save unbanked lr
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@ else
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stmneed R2, {lr} @ save SVC lr
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ldr R5, [SP, #0x58] @ PC is the LR pushed by srsfd
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@ Check to see if we have to adjust for Thumb entry
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sub r4, r0, #1 @ if (ExceptionType == 1 || ExceptionType ==2)) {
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cmp r4, #1 @ // UND & SVC have differnt LR adjust for Thumb
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bhi NoAdjustNeeded
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tst r1, #0x20 @ if ((CPSR & T)) == T) { // Thumb Mode on entry
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addne R5, R5, #2 @ PC += 2@
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str R5,[SP,#0x58] @ Update LR value pused by srsfd
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NoAdjustNeeded:
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str R5, [SP, #0x3c] @ Store it in EFI_SYSTEM_CONTEXT_ARM.PC
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sub R1, SP, #0x60 @ We pused 0x60 bytes on the stack
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str R1, [SP, #0x34] @ Store it in EFI_SYSTEM_CONTEXT_ARM.SP
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@ R0 is ExceptionType
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mov R1,SP @ R1 is SystemContext
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/*
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VOID
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EFIAPI
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GdbExceptionHandler (
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IN EFI_EXCEPTION_TYPE ExceptionType, R0
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IN OUT EFI_SYSTEM_CONTEXT SystemContext R1
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)
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*/
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blx ASM_PFX(GdbExceptionHandler) @ Call exception handler
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ldr R1,[SP,#0x3c] @ EFI_SYSTEM_CONTEXT_ARM.PC
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str R1,[SP,#0x58] @ Store it back to srsfd stack slot so it can be restored
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ldr R1,[SP,#0x40] @ EFI_SYSTEM_CONTEXT_ARM.CPSR
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str R1,[SP,#0x5c] @ Store it back to srsfd stack slot so it can be restored
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add R3, SP, #0x54 @ Make R3 point to SVC LR saved on entry
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add R2, SP, #0x38 @ Make R2 point to EFI_SYSTEM_CONTEXT_ARM.LR
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and R1, R1, #0x1f @ Check to see if User or System Mode
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cmp R1, #0x1f @ if ((CPSR == 0x10) || (CPSR == 0x1f))
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cmpne R1, #0x10 @
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ldmeqed R2, {lr}^ @ restore unbanked lr
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@ else
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ldmneed R3, {lr} @ restore SVC lr, via ldmfd SP!, {LR}
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ldmfd SP!,{R0-R12} @ Restore general purpose registers
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@ Exception handler can not change SP
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add SP,SP,#0x20 @ Clear out the remaining stack space
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ldmfd SP!,{LR} @ restore the link register for this context
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rfefd SP! @ return from exception via srsfd stack slot
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|
259
EmbeddedPkg/Library/GdbDebugAgent/Arm/ExceptionSupport.ARMv6.asm
Executable file
259
EmbeddedPkg/Library/GdbDebugAgent/Arm/ExceptionSupport.ARMv6.asm
Executable file
@ -0,0 +1,259 @@
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//------------------------------------------------------------------------------
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//
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// Use ARMv6 instruction to operate on a single stack
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//
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// Copyright (c) 2008-2010 Apple Inc. All rights reserved.
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//
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||||
// 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.
|
||||
//
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||||
//------------------------------------------------------------------------------
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/*
|
||||
|
||||
This is the stack constructed by the exception handler (low address to high address)
|
||||
# R0 - IFAR is EFI_SYSTEM_CONTEXT for ARM
|
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Reg Offset
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||||
=== ======
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||||
R0 0x00 # stmfd SP!,{R0-R12}
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R1 0x04
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R2 0x08
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R3 0x0c
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R4 0x10
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R5 0x14
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R6 0x18
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R7 0x1c
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R8 0x20
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R9 0x24
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R10 0x28
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R11 0x2c
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R12 0x30
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SP 0x34 # reserved via adding 0x20 (32) to the SP
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LR 0x38
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PC 0x3c
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CPSR 0x40
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DFSR 0x44
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DFAR 0x48
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IFSR 0x4c
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IFAR 0x50
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LR 0x54 # SVC Link register (we need to restore it)
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LR 0x58 # pushed by srsfd
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CPSR 0x5c
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*/
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EXPORT ExceptionHandlersStart
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EXPORT ExceptionHandlersEnd
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EXPORT CommonExceptionEntry
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EXPORT AsmCommonExceptionEntry
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IMPORT GdbExceptionHandler
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PRESERVE8
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AREA DxeExceptionHandlers, CODE, READONLY
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//
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// This code gets copied to the ARM vector table
|
||||
// ExceptionHandlersStart - ExceptionHandlersEnd gets copied
|
||||
//
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ExceptionHandlersStart
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Reset
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b Reset
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UndefinedInstruction
|
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b UndefinedInstructionEntry
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SoftwareInterrupt
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b SoftwareInterruptEntry
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PrefetchAbort
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b PrefetchAbortEntry
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DataAbort
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b DataAbortEntry
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||||
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ReservedException
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b ReservedExceptionEntry
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||||
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Irq
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b Irq
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||||
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Fiq
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b FiqEntry
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UndefinedInstructionEntry
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sub LR, LR, #4 ; Only -2 for Thumb, adjust in CommonExceptionEntry
|
||||
srsfd #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 ; ExceptionType
|
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ldr R1,CommonExceptionEntry;
|
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bx R1
|
||||
|
||||
SoftwareInterruptEntry
|
||||
sub LR, LR, #4 ; Only -2 for Thumb, adjust in CommonExceptionEntry
|
||||
srsfd #0x13! ; Store return state on SVC stack
|
||||
; We are already in SVC mode
|
||||
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 ; ExceptionType
|
||||
ldr R1,CommonExceptionEntry
|
||||
bx R1
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||||
|
||||
PrefetchAbortEntry
|
||||
sub LR,LR,#4
|
||||
srsfd #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 ; ExceptionType
|
||||
ldr R1,CommonExceptionEntry
|
||||
bx R1
|
||||
|
||||
DataAbortEntry
|
||||
sub LR,LR,#8
|
||||
srsfd #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 ; ExceptionType
|
||||
ldr R1,CommonExceptionEntry
|
||||
bx R1
|
||||
|
||||
ReservedExceptionEntry
|
||||
srsfd #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 ; ExceptionType
|
||||
ldr R1,CommonExceptionEntry
|
||||
bx R1
|
||||
|
||||
FiqEntry
|
||||
sub LR,LR,#4
|
||||
srsfd #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
|
||||
; Since we have already switch to SVC R8_fiq - R12_fiq
|
||||
; never get used or saved
|
||||
mov R0,#7 ; ExceptionType
|
||||
ldr R1,CommonExceptionEntry
|
||||
bx R1
|
||||
|
||||
//
|
||||
// This gets patched by the C code that patches in the vector table
|
||||
//
|
||||
CommonExceptionEntry
|
||||
dcd 0x12345678
|
||||
|
||||
ExceptionHandlersEnd
|
||||
|
||||
//
|
||||
// This code runs from CpuDxe driver loaded address. It is patched into
|
||||
// CommonExceptionEntry.
|
||||
//
|
||||
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] ; srsfd saved pre-exception CPSR on the stack
|
||||
str R1, [SP, #0x40] ; Store it in EFI_SYSTEM_CONTEXT_ARM.CPSR
|
||||
|
||||
add R2, SP, #0x38 ; Make R2 point to EFI_SYSTEM_CONTEXT_ARM.LR
|
||||
and R3, R1, #0x1f ; Check CPSR to see if User or System Mode
|
||||
cmp R3, #0x1f ; if ((CPSR == 0x10) || (CPSR == 0x1df))
|
||||
cmpne R3, #0x10 ;
|
||||
stmeqed R2, {lr}^ ; save unbanked lr
|
||||
; else
|
||||
stmneed R2, {lr} ; save SVC lr
|
||||
|
||||
|
||||
ldr R5, [SP, #0x58] ; PC is the LR pushed by srsfd
|
||||
; Check to see if we have to adjust for Thumb entry
|
||||
sub r4, r0, #1 ; if (ExceptionType == 1 || ExceptionType ==2)) {
|
||||
cmp r4, #1 ; // UND & SVC have differnt LR adjust for Thumb
|
||||
bhi NoAdjustNeeded
|
||||
|
||||
tst r1, #0x20 ; if ((CPSR & T)) == T) { // Thumb Mode on entry
|
||||
addne R5, R5, #2 ; PC += 2;
|
||||
str R5,[SP,#0x58] ; Update LR value pused by srsfd
|
||||
|
||||
NoAdjustNeeded
|
||||
|
||||
str R5, [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 ExceptionType
|
||||
mov R1,SP ; R1 is SystemContext
|
||||
|
||||
/*
|
||||
VOID
|
||||
EFIAPI
|
||||
GdbExceptionHandler (
|
||||
IN EFI_EXCEPTION_TYPE ExceptionType, R0
|
||||
IN OUT EFI_SYSTEM_CONTEXT SystemContext R1
|
||||
)
|
||||
|
||||
*/
|
||||
blx GdbExceptionHandler ; Call exception handler
|
||||
|
||||
ldr R1,[SP,#0x3c] ; EFI_SYSTEM_CONTEXT_ARM.PC
|
||||
str R1,[SP,#0x58] ; Store it back to srsfd stack slot so it can be restored
|
||||
|
||||
ldr R1,[SP,#0x40] ; EFI_SYSTEM_CONTEXT_ARM.CPSR
|
||||
str R1,[SP,#0x5c] ; Store it back to srsfd stack slot so it can be restored
|
||||
|
||||
add R3, SP, #0x54 ; Make R3 point to SVC LR saved on entry
|
||||
add R2, SP, #0x38 ; Make R2 point to EFI_SYSTEM_CONTEXT_ARM.LR
|
||||
and R1, R1, #0x1f ; Check to see if User or System Mode
|
||||
cmp R1, #0x1f ; if ((CPSR == 0x10) || (CPSR == 0x1f))
|
||||
cmpne R1, #0x10 ;
|
||||
ldmeqed R2, {lr}^ ; restore unbanked lr
|
||||
; else
|
||||
ldmneed R3, {lr} ; restore SVC lr, via ldmfd SP!, {LR}
|
||||
|
||||
ldmfd SP!,{R0-R12} ; Restore general purpose registers
|
||||
; Exception handler can not change SP
|
||||
|
||||
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 srsfd stack slot
|
||||
|
||||
END
|
||||
|
||||
|
630
EmbeddedPkg/Library/GdbDebugAgent/Arm/Processor.c
Executable file
630
EmbeddedPkg/Library/GdbDebugAgent/Arm/Processor.c
Executable file
@ -0,0 +1,630 @@
|
||||
/** @file
|
||||
Processor specific parts of the GDB stub
|
||||
|
||||
Copyright (c) 2008-2010, 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.
|
||||
|
||||
**/
|
||||
|
||||
|
||||
#include <GdbDebugAgent.h>
|
||||
#include <Library/CacheMaintenanceLib.h>
|
||||
#include <Library/PrintLib.h>
|
||||
#include <Library/ArmLib.h>
|
||||
|
||||
//
|
||||
// Externs from the exception handler assembly file
|
||||
//
|
||||
VOID
|
||||
ExceptionHandlersStart (
|
||||
VOID
|
||||
);
|
||||
|
||||
VOID
|
||||
ExceptionHandlersEnd (
|
||||
VOID
|
||||
);
|
||||
|
||||
VOID
|
||||
CommonExceptionEntry (
|
||||
VOID
|
||||
);
|
||||
|
||||
VOID
|
||||
AsmCommonExceptionEntry (
|
||||
VOID
|
||||
);
|
||||
|
||||
|
||||
//
|
||||
// Array of exception types that need to be hooked by the debugger
|
||||
// (efi, gdb) //efi number
|
||||
//
|
||||
EFI_EXCEPTION_TYPE_ENTRY gExceptionType[] = {
|
||||
{ EXCEPT_ARM_SOFTWARE_INTERRUPT, GDB_SIGTRAP },
|
||||
{ EXCEPT_ARM_UNDEFINED_INSTRUCTION, GDB_SIGTRAP },
|
||||
{ EXCEPT_ARM_PREFETCH_ABORT, GDB_SIGTRAP },
|
||||
{ EXCEPT_ARM_DATA_ABORT, GDB_SIGTRAP }, // GDB_SIGEMT
|
||||
{ EXCEPT_ARM_RESERVED, GDB_SIGTRAP }, // GDB_SIGILL
|
||||
{ EXCEPT_ARM_FIQ, GDB_SIGINT } // Used for ctrl-c
|
||||
};
|
||||
|
||||
// Shut up some annoying RVCT warnings
|
||||
#ifdef __CC_ARM
|
||||
#pragma diag_suppress 1296
|
||||
#endif
|
||||
|
||||
UINTN gRegisterOffsets[] = {
|
||||
OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R0),
|
||||
OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R1),
|
||||
OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R2),
|
||||
OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R3),
|
||||
OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R4),
|
||||
OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R5),
|
||||
OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R6),
|
||||
OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R7),
|
||||
OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R8),
|
||||
OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R9),
|
||||
OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R10),
|
||||
OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R11),
|
||||
OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R12),
|
||||
OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, SP),
|
||||
OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, LR),
|
||||
OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, PC),
|
||||
0x00000F01, // f0
|
||||
0x00000F02,
|
||||
0x00000F03,
|
||||
0x00000F11, // f1
|
||||
0x00000F12,
|
||||
0x00000F13,
|
||||
0x00000F21, // f2
|
||||
0x00000F22,
|
||||
0x00000F23,
|
||||
0x00000F31, // f3
|
||||
0x00000F32,
|
||||
0x00000F33,
|
||||
0x00000F41, // f4
|
||||
0x00000F42,
|
||||
0x00000F43,
|
||||
0x00000F51, // f5
|
||||
0x00000F52,
|
||||
0x00000F53,
|
||||
0x00000F61, // f6
|
||||
0x00000F62,
|
||||
0x00000F63,
|
||||
0x00000F71, // f7
|
||||
0x00000F72,
|
||||
0x00000F73,
|
||||
0x00000FFF, // fps
|
||||
OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, CPSR)
|
||||
};
|
||||
|
||||
// restore warnings for RVCT
|
||||
#ifdef __CC_ARM
|
||||
#pragma diag_default 1296
|
||||
#endif
|
||||
|
||||
|
||||
/**
|
||||
Return the number of entries in the gExceptionType[]
|
||||
|
||||
@retval UINTN, the number of entries in the gExceptionType[] array.
|
||||
**/
|
||||
UINTN
|
||||
MaxEfiException (
|
||||
VOID
|
||||
)
|
||||
{
|
||||
return sizeof (gExceptionType)/sizeof (EFI_EXCEPTION_TYPE_ENTRY);
|
||||
}
|
||||
|
||||
|
||||
|
||||
|
||||
/**
|
||||
Check to see if the ISA is supported.
|
||||
ISA = Instruction Set Architecture
|
||||
|
||||
@retval TRUE if Isa is supported
|
||||
|
||||
**/
|
||||
BOOLEAN
|
||||
CheckIsa (
|
||||
IN EFI_INSTRUCTION_SET_ARCHITECTURE Isa
|
||||
)
|
||||
{
|
||||
if (Isa == IsaArm) {
|
||||
return TRUE;
|
||||
} else {
|
||||
return FALSE;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
This takes in the register number and the System Context, and returns a pointer to the RegNumber-th register in gdb ordering
|
||||
It is, by default, set to find the register pointer of the ARM member
|
||||
@param SystemContext Register content at time of the exception
|
||||
@param RegNumber The register to which we want to find a pointer
|
||||
@retval the pointer to the RegNumber-th pointer
|
||||
**/
|
||||
UINTN *
|
||||
FindPointerToRegister(
|
||||
IN EFI_SYSTEM_CONTEXT SystemContext,
|
||||
IN UINTN RegNumber
|
||||
)
|
||||
{
|
||||
UINT8 *TempPtr;
|
||||
ASSERT(gRegisterOffsets[RegNumber] < 0xF00);
|
||||
TempPtr = ((UINT8 *)SystemContext.SystemContextArm) + gRegisterOffsets[RegNumber];
|
||||
return (UINT32 *)TempPtr;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
Adds the RegNumber-th register's value to the output buffer, starting at the given OutBufPtr
|
||||
@param SystemContext Register content at time of the exception
|
||||
@param RegNumber the number of the register that we want to read
|
||||
@param OutBufPtr pointer to the output buffer's end. the new data will be added from this point on.
|
||||
@retval the pointer to the next character of the output buffer that is available to be written on.
|
||||
**/
|
||||
CHAR8 *
|
||||
BasicReadRegister (
|
||||
IN EFI_SYSTEM_CONTEXT SystemContext,
|
||||
IN UINTN RegNumber,
|
||||
IN CHAR8 *OutBufPtr
|
||||
)
|
||||
{
|
||||
UINTN RegSize;
|
||||
CHAR8 Char;
|
||||
|
||||
if (gRegisterOffsets[RegNumber] > 0xF00) {
|
||||
AsciiSPrint(OutBufPtr, 9, "00000000");
|
||||
OutBufPtr += 8;
|
||||
return OutBufPtr;
|
||||
}
|
||||
|
||||
RegSize = 0;
|
||||
while (RegSize < 32) {
|
||||
Char = mHexToStr[(UINT8)((*FindPointerToRegister(SystemContext, RegNumber) >> (RegSize+4)) & 0xf)];
|
||||
if ((Char >= 'A') && (Char <= 'F')) {
|
||||
Char = Char - 'A' + 'a';
|
||||
}
|
||||
*OutBufPtr++ = Char;
|
||||
|
||||
Char = mHexToStr[(UINT8)((*FindPointerToRegister(SystemContext, RegNumber) >> RegSize) & 0xf)];
|
||||
if ((Char >= 'A') && (Char <= 'F')) {
|
||||
Char = Char - 'A' + 'a';
|
||||
}
|
||||
*OutBufPtr++ = Char;
|
||||
|
||||
RegSize = RegSize + 8;
|
||||
}
|
||||
return OutBufPtr;
|
||||
}
|
||||
|
||||
|
||||
/** ‘p n’
|
||||
Reads the n-th register's value into an output buffer and sends it as a packet
|
||||
@param SystemContext Register content at time of the exception
|
||||
@param InBuffer Pointer to the input buffer received from gdb server
|
||||
**/
|
||||
VOID
|
||||
ReadNthRegister (
|
||||
IN EFI_SYSTEM_CONTEXT SystemContext,
|
||||
IN CHAR8 *InBuffer
|
||||
)
|
||||
{
|
||||
UINTN RegNumber;
|
||||
CHAR8 OutBuffer[9]; // 1 reg=8 hex chars, and the end '\0' (escape seq)
|
||||
CHAR8 *OutBufPtr; // pointer to the output buffer
|
||||
|
||||
RegNumber = AsciiStrHexToUintn (&InBuffer[1]);
|
||||
|
||||
if (RegNumber >= (sizeof (gRegisterOffsets)/sizeof (UINTN))) {
|
||||
SendError (GDB_EINVALIDREGNUM);
|
||||
return;
|
||||
}
|
||||
|
||||
OutBufPtr = OutBuffer;
|
||||
OutBufPtr = BasicReadRegister (SystemContext, RegNumber, OutBufPtr);
|
||||
|
||||
*OutBufPtr = '\0'; // the end of the buffer
|
||||
SendPacket(OutBuffer);
|
||||
}
|
||||
|
||||
|
||||
/** ‘g’
|
||||
Reads the general registers into an output buffer and sends it as a packet
|
||||
@param SystemContext Register content at time of the exception
|
||||
**/
|
||||
VOID
|
||||
EFIAPI
|
||||
ReadGeneralRegisters (
|
||||
IN EFI_SYSTEM_CONTEXT SystemContext
|
||||
)
|
||||
{
|
||||
UINTN Index;
|
||||
// a UINT32 takes 8 ascii characters
|
||||
CHAR8 OutBuffer[(sizeof (gRegisterOffsets) * 2) + 1];
|
||||
CHAR8 *OutBufPtr;
|
||||
|
||||
// It is not safe to allocate pool here....
|
||||
OutBufPtr = OutBuffer;
|
||||
for (Index = 0; Index < (sizeof (gRegisterOffsets)/sizeof (UINTN)); Index++) {
|
||||
OutBufPtr = BasicReadRegister (SystemContext, Index, OutBufPtr);
|
||||
}
|
||||
|
||||
*OutBufPtr = '\0';
|
||||
SendPacket(OutBuffer);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
Adds the RegNumber-th register's value to the output buffer, starting at the given OutBufPtr
|
||||
@param SystemContext Register content at time of the exception
|
||||
@param RegNumber the number of the register that we want to write
|
||||
@param InBufPtr pointer to the output buffer. the new data will be extracted from the input buffer from this point on.
|
||||
@retval the pointer to the next character of the input buffer that can be used
|
||||
**/
|
||||
CHAR8 *
|
||||
BasicWriteRegister (
|
||||
IN EFI_SYSTEM_CONTEXT SystemContext,
|
||||
IN UINTN RegNumber,
|
||||
IN CHAR8 *InBufPtr
|
||||
)
|
||||
{
|
||||
UINTN RegSize;
|
||||
UINTN TempValue; // the value transferred from a hex char
|
||||
UINT32 NewValue; // the new value of the RegNumber-th Register
|
||||
|
||||
if (gRegisterOffsets[RegNumber] > 0xF00) {
|
||||
return InBufPtr + 8;
|
||||
}
|
||||
|
||||
NewValue = 0;
|
||||
RegSize = 0;
|
||||
while (RegSize < 32) {
|
||||
TempValue = HexCharToInt(*InBufPtr++);
|
||||
|
||||
if ((INTN)TempValue < 0) {
|
||||
SendError (GDB_EBADMEMDATA);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
NewValue += (TempValue << (RegSize+4));
|
||||
TempValue = HexCharToInt(*InBufPtr++);
|
||||
|
||||
if ((INTN)TempValue < 0) {
|
||||
SendError (GDB_EBADMEMDATA);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
NewValue += (TempValue << RegSize);
|
||||
RegSize = RegSize + 8;
|
||||
}
|
||||
*(FindPointerToRegister(SystemContext, RegNumber)) = NewValue;
|
||||
return InBufPtr;
|
||||
}
|
||||
|
||||
|
||||
/** ‘P n...=r...’
|
||||
Writes the new value of n-th register received into the input buffer to the n-th register
|
||||
@param SystemContext Register content at time of the exception
|
||||
@param InBuffer Ponter to the input buffer received from gdb server
|
||||
**/
|
||||
VOID
|
||||
WriteNthRegister (
|
||||
IN EFI_SYSTEM_CONTEXT SystemContext,
|
||||
IN CHAR8 *InBuffer
|
||||
)
|
||||
{
|
||||
UINTN RegNumber;
|
||||
CHAR8 RegNumBuffer[MAX_REG_NUM_BUF_SIZE]; // put the 'n..' part of the message into this array
|
||||
CHAR8 *RegNumBufPtr;
|
||||
CHAR8 *InBufPtr; // pointer to the input buffer
|
||||
|
||||
// find the register number to write
|
||||
InBufPtr = &InBuffer[1];
|
||||
RegNumBufPtr = RegNumBuffer;
|
||||
while (*InBufPtr != '=') {
|
||||
*RegNumBufPtr++ = *InBufPtr++;
|
||||
}
|
||||
*RegNumBufPtr = '\0';
|
||||
RegNumber = AsciiStrHexToUintn (RegNumBuffer);
|
||||
|
||||
// check if this is a valid Register Number
|
||||
if (RegNumber >= (sizeof (gRegisterOffsets)/sizeof (UINTN))) {
|
||||
SendError (GDB_EINVALIDREGNUM);
|
||||
return;
|
||||
}
|
||||
InBufPtr++; // skips the '=' character
|
||||
BasicWriteRegister (SystemContext, RegNumber, InBufPtr);
|
||||
SendSuccess();
|
||||
}
|
||||
|
||||
|
||||
/** ‘G XX...’
|
||||
Writes the new values received into the input buffer to the general registers
|
||||
@param SystemContext Register content at time of the exception
|
||||
@param InBuffer Pointer to the input buffer received from gdb server
|
||||
**/
|
||||
|
||||
VOID
|
||||
EFIAPI
|
||||
WriteGeneralRegisters (
|
||||
IN EFI_SYSTEM_CONTEXT SystemContext,
|
||||
IN CHAR8 *InBuffer
|
||||
)
|
||||
{
|
||||
UINTN i;
|
||||
CHAR8 *InBufPtr; /// pointer to the input buffer
|
||||
UINTN MinLength;
|
||||
UINTN RegisterCount = (sizeof (gRegisterOffsets)/sizeof (UINTN));
|
||||
|
||||
MinLength = (RegisterCount * 8) + 1; // 'G' plus the registers in ASCII format
|
||||
|
||||
if (AsciiStrLen(InBuffer) < MinLength) {
|
||||
//Bad message. Message is not the right length
|
||||
SendError (GDB_EBADBUFSIZE);
|
||||
return;
|
||||
}
|
||||
|
||||
InBufPtr = &InBuffer[1];
|
||||
|
||||
// Read the new values for the registers from the input buffer to an array, NewValueArray.
|
||||
// The values in the array are in the gdb ordering
|
||||
for(i = 0; i < RegisterCount; i++) {
|
||||
InBufPtr = BasicWriteRegister (SystemContext, i, InBufPtr);
|
||||
}
|
||||
|
||||
SendSuccess ();
|
||||
}
|
||||
|
||||
|
||||
|
||||
|
||||
/** ‘c [addr ]’
|
||||
Continue. addr is Address to resume. If addr is omitted, resume at current
|
||||
Address.
|
||||
|
||||
@param SystemContext Register content at time of the exception
|
||||
**/
|
||||
VOID
|
||||
EFIAPI
|
||||
ContinueAtAddress (
|
||||
IN EFI_SYSTEM_CONTEXT SystemContext,
|
||||
IN CHAR8 *PacketData
|
||||
)
|
||||
{
|
||||
if (PacketData[1] != '\0') {
|
||||
SystemContext.SystemContextArm->PC = AsciiStrHexToUintn(&PacketData[1]);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/** ‘s [addr ]’
|
||||
Single step. addr is the Address at which to resume. If addr is omitted, resume
|
||||
at same Address.
|
||||
|
||||
@param SystemContext Register content at time of the exception
|
||||
**/
|
||||
VOID
|
||||
EFIAPI
|
||||
SingleStep (
|
||||
IN EFI_SYSTEM_CONTEXT SystemContext,
|
||||
IN CHAR8 *PacketData
|
||||
)
|
||||
{
|
||||
SendNotSupported();
|
||||
}
|
||||
|
||||
|
||||
VOID
|
||||
EFIAPI
|
||||
InsertBreakPoint (
|
||||
IN EFI_SYSTEM_CONTEXT SystemContext,
|
||||
IN CHAR8 *PacketData
|
||||
)
|
||||
{
|
||||
SendNotSupported ();
|
||||
}
|
||||
|
||||
VOID
|
||||
EFIAPI
|
||||
RemoveBreakPoint (
|
||||
IN EFI_SYSTEM_CONTEXT SystemContext,
|
||||
IN CHAR8 *PacketData
|
||||
)
|
||||
{
|
||||
SendNotSupported ();
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
Send the T signal with the given exception type (in gdb order) and possibly
|
||||
with n:r pairs related to the watchpoints
|
||||
|
||||
@param SystemContext Register content at time of the exception
|
||||
@param GdbExceptionType GDB exception type
|
||||
**/
|
||||
VOID
|
||||
ProcessorSendTSignal (
|
||||
IN EFI_SYSTEM_CONTEXT SystemContext,
|
||||
IN UINT8 GdbExceptionType,
|
||||
IN OUT CHAR8 *TSignalPtr,
|
||||
IN UINTN SizeOfBuffer
|
||||
)
|
||||
{
|
||||
*TSignalPtr = '\0';
|
||||
}
|
||||
|
||||
/**
|
||||
Check to see if this exception is related to ctrl-c handling.
|
||||
|
||||
In this scheme we dedicate FIQ to the ctrl-c handler so it is
|
||||
independent of the rest of the system.
|
||||
|
||||
SaveAndSetDebugTimerInterrupt () can be used to
|
||||
|
||||
@param ExceptionType Exception that is being processed
|
||||
@param SystemContext Register content at time of the exception
|
||||
|
||||
@return TRUE This was a ctrl-c check that did not find a ctrl-c
|
||||
@return FALSE This was not a ctrl-c check or some one hit ctrl-c
|
||||
**/
|
||||
BOOLEAN
|
||||
ProcessorControlC (
|
||||
IN EFI_EXCEPTION_TYPE ExceptionType,
|
||||
IN OUT EFI_SYSTEM_CONTEXT SystemContext
|
||||
)
|
||||
{
|
||||
BOOLEAN Return = TRUE;
|
||||
|
||||
if (ExceptionType != EXCEPT_ARM_FIQ) {
|
||||
// Skip it as it is not related to ctrl-c
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
while (TRUE) {
|
||||
if (!GdbIsCharAvailable ()) {
|
||||
//
|
||||
// No characters are pending so exit the loop
|
||||
//
|
||||
Return = TRUE;
|
||||
break;
|
||||
}
|
||||
|
||||
if (GdbGetChar () == 0x03) {
|
||||
//
|
||||
// We have a ctrl-c so exit and process exception for ctrl-c
|
||||
//
|
||||
Return = FALSE;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
DebugAgentTimerEndOfInterrupt ();
|
||||
|
||||
// Force an exit from the exception handler as we are done
|
||||
return Return;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
Enable/Disable the interrupt of debug timer and return the interrupt state
|
||||
prior to the operation.
|
||||
|
||||
If EnableStatus is TRUE, enable the interrupt of debug timer.
|
||||
If EnableStatus is FALSE, disable the interrupt of debug timer.
|
||||
|
||||
@param[in] EnableStatus Enable/Disable.
|
||||
|
||||
@return FALSE always.
|
||||
|
||||
**/
|
||||
BOOLEAN
|
||||
EFIAPI
|
||||
SaveAndSetDebugTimerInterrupt (
|
||||
IN BOOLEAN EnableStatus
|
||||
)
|
||||
{
|
||||
BOOLEAN FiqEnabled;
|
||||
|
||||
FiqEnabled = ArmGetFiqState ();
|
||||
|
||||
if (EnableStatus) {
|
||||
DebugAgentTimerSetPeriod (100);
|
||||
ArmEnableFiq ();
|
||||
} else {
|
||||
DebugAgentTimerSetPeriod (0);
|
||||
ArmDisableFiq ();
|
||||
}
|
||||
|
||||
return FiqEnabled;
|
||||
}
|
||||
|
||||
VOID
|
||||
GdbFPutString (
|
||||
IN CHAR8 *String
|
||||
);
|
||||
|
||||
/**
|
||||
Initialize debug agent.
|
||||
|
||||
This function is used to set up debug enviroment. It may enable interrupts.
|
||||
|
||||
@param[in] InitFlag Init flag is used to decide initialize process.
|
||||
@param[in] Context Context needed according to InitFlag, it was optional.
|
||||
|
||||
**/
|
||||
VOID
|
||||
EFIAPI
|
||||
InitializeDebugAgent (
|
||||
IN UINT32 InitFlag,
|
||||
IN VOID *Context OPTIONAL
|
||||
)
|
||||
{
|
||||
UINTN Offset;
|
||||
UINTN Length;
|
||||
BOOLEAN IrqEnabled;
|
||||
BOOLEAN FiqEnabled;
|
||||
UINT32 *VectorBase;
|
||||
|
||||
|
||||
//
|
||||
// Disable interrupts
|
||||
//
|
||||
IrqEnabled = ArmGetInterruptState ();
|
||||
ArmDisableInterrupts ();
|
||||
|
||||
//
|
||||
// EFI does not use the FIQ, but a debugger might so we must disable
|
||||
// as we take over the exception vectors.
|
||||
//
|
||||
FiqEnabled = ArmGetFiqState ();
|
||||
ArmDisableFiq ();
|
||||
|
||||
//
|
||||
// Copy an implementation of the ARM exception vectors to PcdCpuVectorBaseAddress.
|
||||
//
|
||||
Length = (UINTN)ExceptionHandlersEnd - (UINTN)ExceptionHandlersStart;
|
||||
|
||||
//
|
||||
// Reserve space for the exception handlers
|
||||
//
|
||||
VectorBase = (UINT32 *)(UINTN)PcdGet32 (PcdCpuVectorBaseAddress);
|
||||
|
||||
|
||||
// Copy our assembly code into the page that contains the exception vectors.
|
||||
CopyMem ((VOID *)VectorBase, (VOID *)ExceptionHandlersStart, Length);
|
||||
|
||||
//
|
||||
// Patch in the common Assembly exception handler
|
||||
//
|
||||
Offset = (UINTN)CommonExceptionEntry - (UINTN)ExceptionHandlersStart;
|
||||
*(UINTN *) (((UINT8 *)VectorBase) + Offset) = (UINTN)AsmCommonExceptionEntry;
|
||||
|
||||
// Flush Caches since we updated executable stuff
|
||||
InvalidateInstructionCacheRange ((VOID *)PcdGet32(PcdCpuVectorBaseAddress), Length);
|
||||
|
||||
DebugAgentTimerIntialize ();
|
||||
|
||||
if (FiqEnabled) {
|
||||
ArmEnableFiq ();
|
||||
}
|
||||
|
||||
if (IrqEnabled) {
|
||||
ArmEnableInterrupts ();
|
||||
}
|
||||
|
||||
return;
|
||||
}
|
||||
|
Reference in New Issue
Block a user