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ArmPkg: update CpuDxe to use CpuExceptionHandlerLib 

Use the new ARM/AArch64 implementation of the base
CpuExceptionHandlerLib library from CpuDxe to centralize
exception handling.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Eugene Cohen <eugene@hp.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
This commit is contained in:
Cohen, Eugene 2016-03-07 15:16:38 +00:00 committed by Ard Biesheuvel
parent 8a47a6cb9e
commit 5811eea0fd
7 changed files with 98 additions and 1402 deletions
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154
ArmPkg/Drivers/CpuDxe/AArch64/Exception.c
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@ -1,154 +0,0 @@
/** @file
Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
Portions Copyright (c) 2011 - 2014, ARM Ltd. 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.
**/
#include "CpuDxe.h"
#include <Chipset/AArch64.h>
VOID
ExceptionHandlersStart (
VOID
);
VOID
ExceptionHandlersEnd (
VOID
);
VOID
CommonExceptionEntry (
VOID
);
VOID
AsmCommonExceptionEntry (
VOID
);
EFI_EXCEPTION_CALLBACK gExceptionHandlers[MAX_AARCH64_EXCEPTION + 1];
EFI_EXCEPTION_CALLBACK gDebuggerExceptionHandlers[MAX_AARCH64_EXCEPTION + 1];
/**
This function registers and enables the handler specified by InterruptHandler for a processor
interrupt or exception type specified by InterruptType. If InterruptHandler is NULL, then the
handler for the processor interrupt or exception type specified by InterruptType is uninstalled.
The installed handler is called once for each processor interrupt or exception.
@param InterruptType A pointer to the processor's current interrupt state. Set to TRUE if interrupts
are enabled and FALSE if interrupts are disabled.
@param InterruptHandler A pointer to a function of type EFI_CPU_INTERRUPT_HANDLER that is called
when a processor interrupt occurs. If this parameter is NULL, then the handler
will be uninstalled.
@retval EFI_SUCCESS The handler for the processor interrupt was successfully installed or uninstalled.
@retval EFI_ALREADY_STARTED InterruptHandler is not NULL, and a handler for InterruptType was
previously installed.
@retval EFI_INVALID_PARAMETER InterruptHandler is NULL, and a handler for InterruptType was not
previously installed.
@retval EFI_UNSUPPORTED The interrupt specified by InterruptType is not supported.
**/
EFI_STATUS
RegisterInterruptHandler (
IN EFI_EXCEPTION_TYPE InterruptType,
IN EFI_CPU_INTERRUPT_HANDLER InterruptHandler
)
{
if (InterruptType > MAX_AARCH64_EXCEPTION) {
return EFI_UNSUPPORTED;
}
if ((InterruptHandler != NULL) && (gExceptionHandlers[InterruptType] != NULL)) {
return EFI_ALREADY_STARTED;
}
gExceptionHandlers[InterruptType] = InterruptHandler;
return EFI_SUCCESS;
}
VOID
EFIAPI
CommonCExceptionHandler (
IN EFI_EXCEPTION_TYPE ExceptionType,
IN OUT EFI_SYSTEM_CONTEXT SystemContext
)
{
if (ExceptionType <= MAX_AARCH64_EXCEPTION) {
if (gExceptionHandlers[ExceptionType]) {
gExceptionHandlers[ExceptionType] (ExceptionType, SystemContext);
return;
}
} else {
DEBUG ((EFI_D_ERROR, "Unknown exception type %d from %016lx\n", ExceptionType, SystemContext.SystemContextAArch64->ELR));
ASSERT (FALSE);
}
DefaultExceptionHandler (ExceptionType, SystemContext);
}
EFI_STATUS
InitializeExceptions (
IN EFI_CPU_ARCH_PROTOCOL *Cpu
)
{
EFI_STATUS Status;
BOOLEAN IrqEnabled;
BOOLEAN FiqEnabled;
Status = EFI_SUCCESS;
ZeroMem (gExceptionHandlers,sizeof(*gExceptionHandlers));
//
// Disable interrupts
//
Cpu->GetInterruptState (Cpu, &IrqEnabled);
Cpu->DisableInterrupt (Cpu);
//
// EFI does not use the FIQ, but a debugger might so we must disable
// as we take over the exception vectors.
//
FiqEnabled = ArmGetFiqState ();
ArmDisableFiq ();
// The AArch64 Vector table must be 2k-byte aligned - if this assertion fails ensure 'Align=4K'
// is defined into your FDF for this module.
ASSERT (((UINTN)ExceptionHandlersStart & ARM_VECTOR_TABLE_ALIGNMENT) == 0);
// We do not copy the Exception Table at PcdGet32(PcdCpuVectorBaseAddress). We just set Vector
// Base Address to point into CpuDxe code.
ArmWriteVBar ((UINTN)ExceptionHandlersStart);
if (FiqEnabled) {
ArmEnableFiq ();
}
if (IrqEnabled) {
//
// Restore interrupt state
//
Status = Cpu->EnableInterrupt (Cpu);
}
return Status;
}

402
ArmPkg/Drivers/CpuDxe/AArch64/ExceptionSupport.S
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@ -1,402 +0,0 @@
//
// Copyright (c) 2011 - 2014 ARM LTD. All rights reserved.<BR>
// Portion of Copyright (c) 2014 NVIDIA Corporation. 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.
//
//------------------------------------------------------------------------------
#include <Chipset/AArch64.h>
#include <Library/PcdLib.h>
#include <AsmMacroIoLibV8.h>
/*
This is the stack constructed by the exception handler (low address to high address).
X0 to FAR makes up the EFI_SYSTEM_CONTEXT for AArch64.
UINT64 X0; 0x000
UINT64 X1; 0x008
UINT64 X2; 0x010
UINT64 X3; 0x018
UINT64 X4; 0x020
UINT64 X5; 0x028
UINT64 X6; 0x030
UINT64 X7; 0x038
UINT64 X8; 0x040
UINT64 X9; 0x048
UINT64 X10; 0x050
UINT64 X11; 0x058
UINT64 X12; 0x060
UINT64 X13; 0x068
UINT64 X14; 0x070
UINT64 X15; 0x078
UINT64 X16; 0x080
UINT64 X17; 0x088
UINT64 X18; 0x090
UINT64 X19; 0x098
UINT64 X20; 0x0a0
UINT64 X21; 0x0a8
UINT64 X22; 0x0b0
UINT64 X23; 0x0b8
UINT64 X24; 0x0c0
UINT64 X25; 0x0c8
UINT64 X26; 0x0d0
UINT64 X27; 0x0d8
UINT64 X28; 0x0e0
UINT64 FP; 0x0e8 // x29 - Frame Pointer
UINT64 LR; 0x0f0 // x30 - Link Register
UINT64 SP; 0x0f8 // x31 - Stack Pointer
// FP/SIMD Registers. 128bit if used as Q-regs.
UINT64 V0[2]; 0x100
UINT64 V1[2]; 0x110
UINT64 V2[2]; 0x120
UINT64 V3[2]; 0x130
UINT64 V4[2]; 0x140
UINT64 V5[2]; 0x150
UINT64 V6[2]; 0x160
UINT64 V7[2]; 0x170
UINT64 V8[2]; 0x180
UINT64 V9[2]; 0x190
UINT64 V10[2]; 0x1a0
UINT64 V11[2]; 0x1b0
UINT64 V12[2]; 0x1c0
UINT64 V13[2]; 0x1d0
UINT64 V14[2]; 0x1e0
UINT64 V15[2]; 0x1f0
UINT64 V16[2]; 0x200
UINT64 V17[2]; 0x210
UINT64 V18[2]; 0x220
UINT64 V19[2]; 0x230
UINT64 V20[2]; 0x240
UINT64 V21[2]; 0x250
UINT64 V22[2]; 0x260
UINT64 V23[2]; 0x270
UINT64 V24[2]; 0x280
UINT64 V25[2]; 0x290
UINT64 V26[2]; 0x2a0
UINT64 V27[2]; 0x2b0
UINT64 V28[2]; 0x2c0
UINT64 V29[2]; 0x2d0
UINT64 V30[2]; 0x2e0
UINT64 V31[2]; 0x2f0
// System Context
UINT64 ELR; 0x300 // Exception Link Register
UINT64 SPSR; 0x308 // Saved Processor Status Register
UINT64 FPSR; 0x310 // Floating Point Status Register
UINT64 ESR; 0x318 // Exception syndrome register
UINT64 FAR; 0x320 // Fault Address Register
UINT64 Padding;0x328 // Required for stack alignment
*/
GCC_ASM_EXPORT(ExceptionHandlersEnd)
GCC_ASM_EXPORT(CommonExceptionEntry)
GCC_ASM_EXPORT(AsmCommonExceptionEntry)
GCC_ASM_EXPORT(CommonCExceptionHandler)
.text
#define GP_CONTEXT_SIZE (32 * 8)
#define FP_CONTEXT_SIZE (32 * 16)
#define SYS_CONTEXT_SIZE ( 6 * 8) // 5 SYS regs + Alignment requirement (ie: the stack must be aligned on 0x10)
// Cannot str x31 directly
#define ALL_GP_REGS \
REG_PAIR (x0, x1, 0x000, GP_CONTEXT_SIZE); \
REG_PAIR (x2, x3, 0x010, GP_CONTEXT_SIZE); \
REG_PAIR (x4, x5, 0x020, GP_CONTEXT_SIZE); \
REG_PAIR (x6, x7, 0x030, GP_CONTEXT_SIZE); \
REG_PAIR (x8, x9, 0x040, GP_CONTEXT_SIZE); \
REG_PAIR (x10, x11, 0x050, GP_CONTEXT_SIZE); \
REG_PAIR (x12, x13, 0x060, GP_CONTEXT_SIZE); \
REG_PAIR (x14, x15, 0x070, GP_CONTEXT_SIZE); \
REG_PAIR (x16, x17, 0x080, GP_CONTEXT_SIZE); \
REG_PAIR (x18, x19, 0x090, GP_CONTEXT_SIZE); \
REG_PAIR (x20, x21, 0x0a0, GP_CONTEXT_SIZE); \
REG_PAIR (x22, x23, 0x0b0, GP_CONTEXT_SIZE); \
REG_PAIR (x24, x25, 0x0c0, GP_CONTEXT_SIZE); \
REG_PAIR (x26, x27, 0x0d0, GP_CONTEXT_SIZE); \
REG_PAIR (x28, x29, 0x0e0, GP_CONTEXT_SIZE); \
REG_ONE (x30, 0x0f0, GP_CONTEXT_SIZE);
// In order to save the SP we need to put it somewhere else first.
// STR only works with XZR/WZR directly
#define SAVE_SP \
add x1, sp, #(FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE); \
REG_ONE (x1, 0x0f8, GP_CONTEXT_SIZE);
#define ALL_FP_REGS \
REG_PAIR (q0, q1, 0x000, FP_CONTEXT_SIZE); \
REG_PAIR (q2, q3, 0x020, FP_CONTEXT_SIZE); \
REG_PAIR (q4, q5, 0x040, FP_CONTEXT_SIZE); \
REG_PAIR (q6, q7, 0x060, FP_CONTEXT_SIZE); \
REG_PAIR (q8, q9, 0x080, FP_CONTEXT_SIZE); \
REG_PAIR (q10, q11, 0x0a0, FP_CONTEXT_SIZE); \
REG_PAIR (q12, q13, 0x0c0, FP_CONTEXT_SIZE); \
REG_PAIR (q14, q15, 0x0e0, FP_CONTEXT_SIZE); \
REG_PAIR (q16, q17, 0x100, FP_CONTEXT_SIZE); \
REG_PAIR (q18, q19, 0x120, FP_CONTEXT_SIZE); \
REG_PAIR (q20, q21, 0x140, FP_CONTEXT_SIZE); \
REG_PAIR (q22, q23, 0x160, FP_CONTEXT_SIZE); \
REG_PAIR (q24, q25, 0x180, FP_CONTEXT_SIZE); \
REG_PAIR (q26, q27, 0x1a0, FP_CONTEXT_SIZE); \
REG_PAIR (q28, q29, 0x1c0, FP_CONTEXT_SIZE); \
REG_PAIR (q30, q31, 0x1e0, FP_CONTEXT_SIZE);
#define ALL_SYS_REGS \
REG_PAIR (x1, x2, 0x000, SYS_CONTEXT_SIZE); \
REG_PAIR (x3, x4, 0x010, SYS_CONTEXT_SIZE); \
REG_ONE (x5, 0x020, SYS_CONTEXT_SIZE);
//
// This code gets copied to the ARM vector table
// VectorTableStart - VectorTableEnd gets copied
//
VECTOR_BASE(ExceptionHandlersStart)
//
// Current EL with SP0 : 0x0 - 0x180
//
VECTOR_ENTRY(ExceptionHandlersStart, ARM_VECTOR_CUR_SP0_SYNC)
ASM_PFX(SynchronousExceptionSP0):
b ASM_PFX(SynchronousExceptionEntry)
VECTOR_ENTRY(ExceptionHandlersStart, ARM_VECTOR_CUR_SP0_IRQ)
ASM_PFX(IrqSP0):
b ASM_PFX(IrqEntry)
VECTOR_ENTRY(ExceptionHandlersStart, ARM_VECTOR_CUR_SP0_FIQ)
ASM_PFX(FiqSP0):
b ASM_PFX(FiqEntry)
VECTOR_ENTRY(ExceptionHandlersStart, ARM_VECTOR_CUR_SP0_SERR)
ASM_PFX(SErrorSP0):
b ASM_PFX(SErrorEntry)
//
// Current EL with SPx: 0x200 - 0x380
//
VECTOR_ENTRY(ExceptionHandlersStart, ARM_VECTOR_CUR_SPx_SYNC)
ASM_PFX(SynchronousExceptionSPx):
b ASM_PFX(SynchronousExceptionEntry)
VECTOR_ENTRY(ExceptionHandlersStart, ARM_VECTOR_CUR_SPx_IRQ)
ASM_PFX(IrqSPx):
b ASM_PFX(IrqEntry)
VECTOR_ENTRY(ExceptionHandlersStart, ARM_VECTOR_CUR_SPx_FIQ)
ASM_PFX(FiqSPx):
b ASM_PFX(FiqEntry)
VECTOR_ENTRY(ExceptionHandlersStart, ARM_VECTOR_CUR_SPx_SERR)
ASM_PFX(SErrorSPx):
b ASM_PFX(SErrorEntry)
//
// Lower EL using AArch64 : 0x400 - 0x580
//
VECTOR_ENTRY(ExceptionHandlersStart, ARM_VECTOR_LOW_A64_SYNC)
ASM_PFX(SynchronousExceptionA64):
b ASM_PFX(SynchronousExceptionEntry)
VECTOR_ENTRY(ExceptionHandlersStart, ARM_VECTOR_LOW_A64_IRQ)
ASM_PFX(IrqA64):
b ASM_PFX(IrqEntry)
VECTOR_ENTRY(ExceptionHandlersStart, ARM_VECTOR_LOW_A64_FIQ)
ASM_PFX(FiqA64):
b ASM_PFX(FiqEntry)
VECTOR_ENTRY(ExceptionHandlersStart, ARM_VECTOR_LOW_A64_SERR)
ASM_PFX(SErrorA64):
b ASM_PFX(SErrorEntry)
//
// Lower EL using AArch32 : 0x600 - 0x780
//
VECTOR_ENTRY(ExceptionHandlersStart, ARM_VECTOR_LOW_A32_SYNC)
ASM_PFX(SynchronousExceptionA32):
b ASM_PFX(SynchronousExceptionEntry)
VECTOR_ENTRY(ExceptionHandlersStart, ARM_VECTOR_LOW_A32_IRQ)
ASM_PFX(IrqA32):
b ASM_PFX(IrqEntry)
VECTOR_ENTRY(ExceptionHandlersStart, ARM_VECTOR_LOW_A32_FIQ)
ASM_PFX(FiqA32):
b ASM_PFX(FiqEntry)
VECTOR_ENTRY(ExceptionHandlersStart, ARM_VECTOR_LOW_A32_SERR)
ASM_PFX(SErrorA32):
b ASM_PFX(SErrorEntry)
VECTOR_END(ExceptionHandlersStart)
#undef REG_PAIR
#undef REG_ONE
#define REG_PAIR(REG1, REG2, OFFSET, CONTEXT_SIZE) stp REG1, REG2, [sp, #(OFFSET-CONTEXT_SIZE)]
#define REG_ONE(REG1, OFFSET, CONTEXT_SIZE) stur REG1, [sp, #(OFFSET-CONTEXT_SIZE)]
ASM_PFX(SynchronousExceptionEntry):
// Move the stackpointer so we can reach our structure with the str instruction.
sub sp, sp, #(FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE)
// Save all the General regs before touching x0 and x1.
// This does not save r31(SP) as it is special. We do that later.
ALL_GP_REGS
// Record the type of exception that occurred.
mov x0, #EXCEPT_AARCH64_SYNCHRONOUS_EXCEPTIONS
// Jump to our general handler to deal with all the common parts and process the exception.
ldr x1, ASM_PFX(CommonExceptionEntry)
br x1
ASM_PFX(IrqEntry):
sub sp, sp, #(FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE)
ALL_GP_REGS
mov x0, #EXCEPT_AARCH64_IRQ
ldr x1, ASM_PFX(CommonExceptionEntry)
br x1
ASM_PFX(FiqEntry):
sub sp, sp, #(FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE)
ALL_GP_REGS
mov x0, #EXCEPT_AARCH64_FIQ
ldr x1, ASM_PFX(CommonExceptionEntry)
br x1
ASM_PFX(SErrorEntry):
sub sp, sp, #(FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE)
ALL_GP_REGS
mov x0, #EXCEPT_AARCH64_SERROR
ldr x1, ASM_PFX(CommonExceptionEntry)
br x1
//
// This gets patched by the C code that patches in the vector table
//
.align 3
ASM_PFX(CommonExceptionEntry):
.8byte ASM_PFX(AsmCommonExceptionEntry)
ASM_PFX(ExceptionHandlersEnd):
//
// This code runs from CpuDxe driver loaded address. It is patched into
// CommonExceptionEntry.
//
ASM_PFX(AsmCommonExceptionEntry):
/* NOTE:
We have to break up the save code because the immediate value to be used
with the SP is too big to do it all in one step so we need to shuffle the SP
along as we go. (we only have 9bits of immediate to work with) */
// Save the current Stack pointer before we start modifying it.
SAVE_SP
// Preserve the stack pointer we came in with before we modify it
EL1_OR_EL2(x1)
1:mrs x1, elr_el1 // Exception Link Register
mrs x2, spsr_el1 // Saved Processor Status Register 32bit
mrs x3, fpsr // Floating point Status Register 32bit
mrs x4, esr_el1 // EL1 Exception syndrome register 32bit
mrs x5, far_el1 // EL1 Fault Address Register
b 3f
2:mrs x1, elr_el2 // Exception Link Register
mrs x2, spsr_el2 // Saved Processor Status Register 32bit
mrs x3, fpsr // Floating point Status Register 32bit
mrs x4, esr_el2 // EL2 Exception syndrome register 32bit
mrs x5, far_el2 // EL2 Fault Address Register
// Adjust SP to save next set
3:add sp, sp, #FP_CONTEXT_SIZE
// Push FP regs to Stack.
ALL_FP_REGS
// Adjust SP to save next set
add sp, sp, #SYS_CONTEXT_SIZE
// Save the SYS regs
ALL_SYS_REGS
// Point to top of struct after all regs saved
sub sp, sp, #(GP_CONTEXT_SIZE + FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE)
// x0 still holds the exception type.
// Set x1 to point to the top of our struct on the Stack
mov x1, sp
// CommonCExceptionHandler (
// IN EFI_EXCEPTION_TYPE ExceptionType, R0
// IN OUT EFI_SYSTEM_CONTEXT SystemContext R1
// )
// Call the handler as defined above
// For now we spin in the handler if we received an abort of some kind.
// We do not try to recover.
bl ASM_PFX(CommonCExceptionHandler) // Call exception handler
// Defines for popping from stack
#undef REG_PAIR
#undef REG_ONE
#define REG_PAIR(REG1, REG2, OFFSET, CONTEXT_SIZE) ldp REG1, REG2, [sp, #(OFFSET-CONTEXT_SIZE)]
#define REG_ONE(REG1, OFFSET, CONTEXT_SIZE) ldur REG1, [sp, #(OFFSET-CONTEXT_SIZE)]
//
// Disable interrupt(IRQ and FIQ) before restoring context,
// or else the context will be corrupted by interrupt reentrance.
// Interrupt mask will be restored from spsr by hardware when we call eret
//
msr daifset, #3
isb
// Adjust SP to pop system registers
add sp, sp, #(GP_CONTEXT_SIZE + FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE)
ALL_SYS_REGS
EL1_OR_EL2(x6)
1:msr elr_el1, x1 // Exception Link Register
msr spsr_el1,x2 // Saved Processor Status Register 32bit
msr fpsr, x3 // Floating point Status Register 32bit
msr esr_el1, x4 // EL1 Exception syndrome register 32bit
msr far_el1, x5 // EL1 Fault Address Register
b 3f
2:msr elr_el2, x1 // Exception Link Register
msr spsr_el2,x2 // Saved Processor Status Register 32bit
msr fpsr, x3 // Floating point Status Register 32bit
msr esr_el2, x4 // EL2 Exception syndrome register 32bit
msr far_el2, x5 // EL2 Fault Address Register
3:// pop all regs and return from exception.
sub sp, sp, #(FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE)
ALL_GP_REGS
// Adjust SP to pop next set
add sp, sp, #FP_CONTEXT_SIZE
// Pop FP regs to Stack.
ALL_FP_REGS
// Adjust SP to be where we started from when we came into the handler.
// The handler can not change the SP.
add sp, sp, #SYS_CONTEXT_SIZE
eret
#undef REG_PAIR
#undef REG_ONE

234
ArmPkg/Drivers/CpuDxe/Arm/Exception.c
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@ -1,234 +0,0 @@
/** @file
Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
Copyright (c) 2014, ARM Limited. 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.
**/
#include "CpuDxe.h"
//FIXME: Will not compile on non-ARMv7 builds
#include <Chipset/ArmV7.h>
VOID
ExceptionHandlersStart (
VOID
);
VOID
ExceptionHandlersEnd (
VOID
);
VOID
CommonExceptionEntry (
VOID
);
VOID
AsmCommonExceptionEntry (
VOID
);
EFI_EXCEPTION_CALLBACK gExceptionHandlers[MAX_ARM_EXCEPTION + 1];
EFI_EXCEPTION_CALLBACK gDebuggerExceptionHandlers[MAX_ARM_EXCEPTION + 1];
/**
This function registers and enables the handler specified by InterruptHandler for a processor
interrupt or exception type specified by InterruptType. If InterruptHandler is NULL, then the
handler for the processor interrupt or exception type specified by InterruptType is uninstalled.
The installed handler is called once for each processor interrupt or exception.
@param InterruptType A pointer to the processor's current interrupt state. Set to TRUE if interrupts
are enabled and FALSE if interrupts are disabled.
@param InterruptHandler A pointer to a function of type EFI_CPU_INTERRUPT_HANDLER that is called
when a processor interrupt occurs. If this parameter is NULL, then the handler
will be uninstalled.
@retval EFI_SUCCESS The handler for the processor interrupt was successfully installed or uninstalled.
@retval EFI_ALREADY_STARTED InterruptHandler is not NULL, and a handler for InterruptType was
previously installed.
@retval EFI_INVALID_PARAMETER InterruptHandler is NULL, and a handler for InterruptType was not
previously installed.
@retval EFI_UNSUPPORTED The interrupt specified by InterruptType is not supported.
**/
EFI_STATUS
RegisterInterruptHandler (
IN EFI_EXCEPTION_TYPE InterruptType,
IN EFI_CPU_INTERRUPT_HANDLER InterruptHandler
)
{
if (InterruptType > MAX_ARM_EXCEPTION) {
return EFI_UNSUPPORTED;
}
if ((InterruptHandler != NULL) && (gExceptionHandlers[InterruptType] != NULL)) {
return EFI_ALREADY_STARTED;
}
gExceptionHandlers[InterruptType] = InterruptHandler;
return EFI_SUCCESS;
}
VOID
EFIAPI
CommonCExceptionHandler (
IN EFI_EXCEPTION_TYPE ExceptionType,
IN OUT EFI_SYSTEM_CONTEXT SystemContext
)
{
if (ExceptionType <= MAX_ARM_EXCEPTION) {
if (gExceptionHandlers[ExceptionType]) {
gExceptionHandlers[ExceptionType] (ExceptionType, SystemContext);
return;
}
} else {
DEBUG ((EFI_D_ERROR, "Unknown exception type %d from %08x\n", ExceptionType, SystemContext.SystemContextArm->PC));
ASSERT (FALSE);
}
if (ExceptionType == EXCEPT_ARM_SOFTWARE_INTERRUPT) {
//
// ARM JTAG debuggers some times use this vector, so it is not an error to get one
//
return;
}
DefaultExceptionHandler (ExceptionType, SystemContext);
}
EFI_STATUS
InitializeExceptions (
IN EFI_CPU_ARCH_PROTOCOL *Cpu
)
{
EFI_STATUS Status;
UINTN Offset;
UINTN Length;
UINTN Index;
BOOLEAN IrqEnabled;
BOOLEAN FiqEnabled;
EFI_PHYSICAL_ADDRESS Base;
UINT32 *VectorBase;
Status = EFI_SUCCESS;
ZeroMem (gExceptionHandlers,sizeof(*gExceptionHandlers));
//
// Disable interrupts
//
Cpu->GetInterruptState (Cpu, &IrqEnabled);
Cpu->DisableInterrupt (Cpu);
//
// EFI does not use the FIQ, but a debugger might so we must disable
// as we take over the exception vectors.
//
FiqEnabled = ArmGetFiqState ();
ArmDisableFiq ();
if (FeaturePcdGet(PcdRelocateVectorTable) == TRUE) {
//
// Copy an implementation of the ARM exception vectors to PcdCpuVectorBaseAddress.
//
Length = (UINTN)ExceptionHandlersEnd - (UINTN)ExceptionHandlersStart;
// Check if the exception vector is in the low address
if (PcdGet32 (PcdCpuVectorBaseAddress) == 0x0) {
// Set SCTLR.V to 0 to enable VBAR to be used
ArmSetLowVectors ();
} else {
ArmSetHighVectors ();
}
//
// Reserve space for the exception handlers
//
Base = (EFI_PHYSICAL_ADDRESS)PcdGet32 (PcdCpuVectorBaseAddress);
VectorBase = (UINT32 *)(UINTN)Base;
Status = gBS->AllocatePages (AllocateAddress, EfiBootServicesCode, EFI_SIZE_TO_PAGES (Length), &Base);
// If the request was for memory that's not in the memory map (which is often the case for 0x00000000
// on embedded systems, for example, we don't want to hang up. So we'll check here for a status of
// EFI_NOT_FOUND, and continue in that case.
if (EFI_ERROR(Status) && (Status != EFI_NOT_FOUND)) {
ASSERT_EFI_ERROR (Status);
}
if (FeaturePcdGet(PcdDebuggerExceptionSupport) == TRUE) {
// Save existing vector table, in case debugger is already hooked in
CopyMem ((VOID *)gDebuggerExceptionHandlers, (VOID *)VectorBase, sizeof (gDebuggerExceptionHandlers));
}
// 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 *)(UINTN)PcdGet32 (PcdCpuVectorBaseAddress) + Offset) = (UINTN)AsmCommonExceptionEntry;
//
// Initialize the C entry points for interrupts
//
for (Index = 0; Index <= MAX_ARM_EXCEPTION; Index++) {
if (!FeaturePcdGet(PcdDebuggerExceptionSupport) ||
(gDebuggerExceptionHandlers[Index] == 0) || (gDebuggerExceptionHandlers[Index] == (VOID *)(UINTN)0xEAFFFFFE)) {
// Exception handler contains branch to vector location (jmp $) so no handler
// NOTE: This code assumes vectors are ARM and not Thumb code
Status = RegisterInterruptHandler (Index, NULL);
ASSERT_EFI_ERROR (Status);
} else {
// If the debugger has already hooked put its vector back
VectorBase[Index] = (UINT32)(UINTN)gDebuggerExceptionHandlers[Index];
}
}
// Flush Caches since we updated executable stuff
InvalidateInstructionCacheRange ((VOID *)PcdGet32(PcdCpuVectorBaseAddress), Length);
//Note: On ARM processor with the Security Extension, the Vector Table can be located anywhere in the memory.
// The Vector Base Address Register defines the location
ArmWriteVBar (PcdGet32(PcdCpuVectorBaseAddress));
} else {
// The Vector table must be 32-byte aligned
if (((UINT32)ExceptionHandlersStart & ARM_VECTOR_TABLE_ALIGNMENT) != 0) {
ASSERT (0);
return EFI_INVALID_PARAMETER;
}
// We do not copy the Exception Table at PcdGet32(PcdCpuVectorBaseAddress). We just set Vector Base Address to point into CpuDxe code.
ArmWriteVBar ((UINT32)ExceptionHandlersStart);
}
if (FiqEnabled) {
ArmEnableFiq ();
}
if (IrqEnabled) {
//
// Restore interrupt state
//
Status = Cpu->EnableInterrupt (Cpu);
}
return Status;
}

304
ArmPkg/Drivers/CpuDxe/Arm/ExceptionSupport.S
View File

@ -1,304 +0,0 @@
#------------------------------------------------------------------------------
#
# Use ARMv6 instruction to operate on a single stack
#
# Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
# Copyright (c) 2014, ARM Limited. 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.
#
#------------------------------------------------------------------------------
#include <Library/PcdLib.h>
/*
This is the stack constructed by the exception handler (low address to high address)
# R0 - IFAR is EFI_SYSTEM_CONTEXT for ARM
Reg Offset
=== ======
R0 0x00 # stmfd SP!,{R0-R12}
R1 0x04
R2 0x08
R3 0x0c
R4 0x10
R5 0x14
R6 0x18
R7 0x1c
R8 0x20
R9 0x24
R10 0x28
R11 0x2c
R12 0x30
SP 0x34 # reserved via subtraction 0x20 (32) from SP
LR 0x38
PC 0x3c
CPSR 0x40
DFSR 0x44
DFAR 0x48
IFSR 0x4c
IFAR 0x50
LR 0x54 # SVC Link register (we need to restore it)
LR 0x58 # pushed by srsfd
CPSR 0x5c
*/
GCC_ASM_EXPORT(ExceptionHandlersStart)
GCC_ASM_EXPORT(ExceptionHandlersEnd)
GCC_ASM_EXPORT(CommonExceptionEntry)
GCC_ASM_EXPORT(AsmCommonExceptionEntry)
GCC_ASM_EXPORT(CommonCExceptionHandler)
.text
.syntax unified
#if !defined(__APPLE__)
.fpu neon @ makes vpush/vpop assemble
#endif
.align 5
//
// This code gets copied to the ARM vector table
// ExceptionHandlersStart - ExceptionHandlersEnd gets copied
//
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
@ 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,#0 @ ExceptionType
ldr R1,ASM_PFX(CommonExceptionEntry)
bx R1
ASM_PFX(UndefinedInstructionEntry):
sub LR, LR, #4 @ Only -2 for Thumb, adjust in CommonExceptionEntry
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 @ ExceptionType
ldr R1,ASM_PFX(CommonExceptionEntry)
bx R1
ASM_PFX(SoftwareInterruptEntry):
srsdb #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,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 @ ExceptionType
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 @ ExceptionType
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
@ Since we have already switch to SVC R8_fiq - R12_fiq
@ never get used or saved
mov R0,#7 @ ExceptionType
ldr R1,ASM_PFX(CommonExceptionEntry)
bx R1
//
// This gets patched by the C code that patches in the vector table
//
ASM_PFX(CommonExceptionEntry):
.word ASM_PFX(AsmCommonExceptionEntry)
ASM_PFX(ExceptionHandlersEnd):
//
// This code runs from CpuDxe driver loaded address. It is patched into
// CommonExceptionEntry.
//
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
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 == 0x1f))
cmpne R3, #0x10 @
stmdaeq R2, {lr}^ @ save unbanked lr
@ else
stmdane 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;
strne R5,[SP,#0x58] @ Update LR value pushed by srsfd
NoAdjustNeeded:
str R5, [SP, #0x3c] @ Store it in EFI_SYSTEM_CONTEXT_ARM.PC
add R1, SP, #0x60 @ We pushed 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
#if (FixedPcdGet32(PcdVFPEnabled))
vpush {d0-d15} @ save vstm registers in case they are used in optimizations
#endif
mov R4, SP @ Save current SP
tst R4, #4
subne SP, SP, #4 @ Adjust SP if not 8-byte aligned
/*
VOID
EFIAPI
CommonCExceptionHandler (
IN EFI_EXCEPTION_TYPE ExceptionType, R0
IN OUT EFI_SYSTEM_CONTEXT SystemContext R1
)
*/
blx ASM_PFX(CommonCExceptionHandler) @ Call exception handler
mov SP, R4 @ Restore SP
#if (FixedPcdGet32(PcdVFPEnabled))
vpop {d0-d15}
#endif
ldr R1, [SP, #0x4c] @ Restore EFI_SYSTEM_CONTEXT_ARM.IFSR
mcr p15, 0, R1, c5, c0, 1 @ Write IFSR
ldr R1, [SP, #0x44] @ Restore EFI_SYSTEM_CONTEXT_ARM.DFSR
mcr p15, 0, R1, c5, c0, 0 @ Write DFSR
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 @
ldmibeq R2, {lr}^ @ restore unbanked lr
@ else
ldmibne 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

301
ArmPkg/Drivers/CpuDxe/Arm/ExceptionSupport.asm
View File

@ -1,301 +0,0 @@
//------------------------------------------------------------------------------
//
// Use ARMv6 instruction to operate on a single stack
//
// Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
// Copyright (c) 2014, ARM Limited. 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.
//
//------------------------------------------------------------------------------
#include <Library/PcdLib.h>
/*
This is the stack constructed by the exception handler (low address to high address)
# R0 - IFAR is EFI_SYSTEM_CONTEXT for ARM
Reg Offset
=== ======
R0 0x00 # stmfd SP!,{R0-R12}
R1 0x04
R2 0x08
R3 0x0c
R4 0x10
R5 0x14
R6 0x18
R7 0x1c
R8 0x20
R9 0x24
R10 0x28
R11 0x2c
R12 0x30
SP 0x34 # reserved via subtraction 0x20 (32) from SP
LR 0x38
PC 0x3c
CPSR 0x40
DFSR 0x44
DFAR 0x48
IFSR 0x4c
IFAR 0x50
LR 0x54 # SVC Link register (we need to restore it)
LR 0x58 # pushed by srsfd
CPSR 0x5c
*/
EXPORT ExceptionHandlersStart
EXPORT ExceptionHandlersEnd
EXPORT CommonExceptionEntry
EXPORT AsmCommonExceptionEntry
IMPORT CommonCExceptionHandler
PRESERVE8
AREA DxeExceptionHandlers, CODE, READONLY, CODEALIGN, ALIGN=5
//
// This code gets copied to the ARM vector table
// ExceptionHandlersStart - ExceptionHandlersEnd gets copied
//
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
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,#0 ; ExceptionType
ldr R1,CommonExceptionEntry
bx R1
UndefinedInstructionEntry
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
ldr R1,CommonExceptionEntry;
bx R1
SoftwareInterruptEntry
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
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
IrqEntry
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,#6 ; 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 AsmCommonExceptionEntry
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 == 0x1f))
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;
strne R5,[SP,#0x58] ; Update LR value pushed by srsfd
NoAdjustNeeded
str R5, [SP, #0x3c] ; Store it in EFI_SYSTEM_CONTEXT_ARM.PC
add R1, SP, #0x60 ; We pushed 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
#if (FixedPcdGet32(PcdVFPEnabled))
vpush {d0-d15} ; save vstm registers in case they are used in optimizations
#endif
mov R4, SP ; Save current SP
tst R4, #4
subne SP, SP, #4 ; Adjust SP if not 8-byte aligned
/*
VOID
EFIAPI
CommonCExceptionHandler (
IN EFI_EXCEPTION_TYPE ExceptionType, R0
IN OUT EFI_SYSTEM_CONTEXT SystemContext R1
)
*/
blx CommonCExceptionHandler ; Call exception handler
mov SP, R4 ; Restore SP
#if (FixedPcdGet32(PcdVFPEnabled))
vpop {d0-d15}
#endif
ldr R1, [SP, #0x4c] ; Restore EFI_SYSTEM_CONTEXT_ARM.IFSR
mcr p15, 0, R1, c5, c0, 1 ; Write IFSR
ldr R1, [SP, #0x44] ; Restore EFI_SYSTEM_CONTEXT_ARM.DFSR
mcr p15, 0, R1, c5, c0, 0 ; Write DFSR
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

10
ArmPkg/Drivers/CpuDxe/CpuDxe.inf
View File

@ -29,17 +29,13 @@
CpuDxe.h
CpuMpCore.c
CpuMmuCommon.c
Exception.c
[Sources.ARM]
Arm/Mmu.c
Arm/Exception.c
Arm/ExceptionSupport.asm | RVCT
Arm/ExceptionSupport.S | GCC
[Sources.AARCH64]
AArch64/Mmu.c
AArch64/Exception.c
AArch64/ExceptionSupport.S
[Packages]
ArmPkg/ArmPkg.dec
@ -52,6 +48,7 @@
BaseMemoryLib
CacheMaintenanceLib
CpuLib
CpuExceptionHandlerLib
DebugLib
DefaultExceptionHandlerLib
DxeServicesTableLib
@ -69,14 +66,13 @@
gEfiDebugImageInfoTableGuid
gArmMpCoreInfoGuid
gIdleLoopEventGuid
gEfiVectorHandoffTableGuid
[Pcd.common]
gArmTokenSpaceGuid.PcdVFPEnabled
gArmTokenSpaceGuid.PcdCpuVectorBaseAddress
[FeaturePcd.common]
gArmTokenSpaceGuid.PcdCpuDxeProduceDebugSupport
gArmTokenSpaceGuid.PcdRelocateVectorTable
gArmTokenSpaceGuid.PcdDebuggerExceptionSupport
[Depex]

95
ArmPkg/Drivers/CpuDxe/Exception.c Normal file
View File

@ -0,0 +1,95 @@
/** @file
Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
Portions Copyright (c) 2011 - 2014, ARM Ltd. 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.
**/
#include "CpuDxe.h"
#include <Library/CpuExceptionHandlerLib.h>
#include <Guid/VectorHandoffTable.h>
EFI_STATUS
InitializeExceptions (
IN EFI_CPU_ARCH_PROTOCOL *Cpu
) {
EFI_STATUS Status;
EFI_VECTOR_HANDOFF_INFO *VectorInfoList;
EFI_VECTOR_HANDOFF_INFO *VectorInfo;
BOOLEAN IrqEnabled;
BOOLEAN FiqEnabled;
VectorInfo = (EFI_VECTOR_HANDOFF_INFO *)NULL;
Status = EfiGetSystemConfigurationTable(&gEfiVectorHandoffTableGuid, (VOID **)&VectorInfoList);
if (Status == EFI_SUCCESS && VectorInfoList != NULL) {
VectorInfo = VectorInfoList;
}
// intialize the CpuExceptionHandlerLib so we take over the exception vector table from the DXE Core
InitializeCpuExceptionHandlers(VectorInfo);
Status = EFI_SUCCESS;
//
// Disable interrupts
//
Cpu->GetInterruptState (Cpu, &IrqEnabled);
Cpu->DisableInterrupt (Cpu);
//
// EFI does not use the FIQ, but a debugger might so we must disable
// as we take over the exception vectors.
//
FiqEnabled = ArmGetFiqState ();
ArmDisableFiq ();
if (FiqEnabled) {
ArmEnableFiq ();
}
if (IrqEnabled) {
//
// Restore interrupt state
//
Status = Cpu->EnableInterrupt (Cpu);
}
return Status;
}
/**
This function registers and enables the handler specified by InterruptHandler for a processor
interrupt or exception type specified by InterruptType. If InterruptHandler is NULL, then the
handler for the processor interrupt or exception type specified by InterruptType is uninstalled.
The installed handler is called once for each processor interrupt or exception.
@param InterruptType A pointer to the processor's current interrupt state. Set to TRUE if interrupts
are enabled and FALSE if interrupts are disabled.
@param InterruptHandler A pointer to a function of type EFI_CPU_INTERRUPT_HANDLER that is called
when a processor interrupt occurs. If this parameter is NULL, then the handler
will be uninstalled.
@retval EFI_SUCCESS The handler for the processor interrupt was successfully installed or uninstalled.
@retval EFI_ALREADY_STARTED InterruptHandler is not NULL, and a handler for InterruptType was
previously installed.
@retval EFI_INVALID_PARAMETER InterruptHandler is NULL, and a handler for InterruptType was not
previously installed.
@retval EFI_UNSUPPORTED The interrupt specified by InterruptType is not supported.
**/
EFI_STATUS
RegisterInterruptHandler(
IN EFI_EXCEPTION_TYPE InterruptType,
IN EFI_CPU_INTERRUPT_HANDLER InterruptHandler
) {
// pass down to CpuExceptionHandlerLib
return (EFI_STATUS)RegisterCpuInterruptHandler(InterruptType, InterruptHandler);
}