[mirror_edk2.git] / ArmPkg / Library / DefaultExceptionHandlerLib / Arm / DefaultExceptionHandler.c

/** @file\r
  Default exception handler\r
\r
  Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>\r
  Copyright (c) 2012, ARM Ltd. All rights reserved.<BR>\r
\r
  This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include <Uefi.h>\r
#include <Library/BaseLib.h>\r
#include <Library/DebugLib.h>\r
#include <Library/PeCoffGetEntryPointLib.h>\r
#include <Library/PrintLib.h>\r
#include <Library/ArmDisassemblerLib.h>\r
#include <Library/SerialPortLib.h>\r
\r
#include <Guid/DebugImageInfoTable.h>\r
\r
#include <Protocol/DebugSupport.h>\r
#include <Library/DefaultExceptionHandlerLib.h>\r
\r
typedef struct {\r
  UINT32  BIT;\r
  CHAR8   Char;\r
} CPSR_CHAR;\r
\r
CHAR8 *\r
GetImageName (\r
  IN  UINTN  FaultAddress,\r
  OUT UINTN  *ImageBase,\r
  OUT UINTN  *PeCoffSizeOfHeaders\r
  );\r
\r
/**\r
  Convert the Current Program Status Register (CPSR) to a string. The string is\r
  a defacto standard in the ARM world.\r
\r
  It is possible to add extra bits by adding them to CpsrChar array.\r
\r
  @param  Cpsr         ARM CPSR register value\r
  @param  ReturnStr    32 byte string that contains string version of CPSR\r
\r
**/\r
VOID\r
CpsrString (\r
  IN  UINT32  Cpsr,\r
  OUT CHAR8   *ReturnStr\r
  )\r
{\r
  UINTN     Index;\r
  CHAR8*    Str;\r
  CHAR8*    ModeStr;\r
  CPSR_CHAR CpsrChar[] = {\r
    { 31, 'n' },\r
    { 30, 'z' },\r
    { 29, 'c' },\r
    { 28, 'v' },\r
\r
    { 9,  'e' },\r
    { 8,  'a' },\r
    { 7,  'i' },\r
    { 6,  'f' },\r
    { 5,  't' },\r
    { 0,  '?' }\r
  };\r
\r
  Str = ReturnStr;\r
\r
  for (Index = 0; CpsrChar[Index].BIT != 0; Index++, Str++) {\r
    *Str = CpsrChar[Index].Char;\r
    if ((Cpsr & (1 << CpsrChar[Index].BIT)) != 0) {\r
      // Concert to upper case if bit is set\r
      *Str &= ~0x20;\r
    }\r
  }\r
\r
  *Str++ = '_';\r
  *Str = '\0';\r
\r
  switch (Cpsr & 0x1f) {\r
  case 0x10:\r
    ModeStr = "usr";\r
    break;\r
  case 0x011:\r
    ModeStr = "fiq";\r
    break;\r
  case 0x12:\r
    ModeStr = "irq";\r
    break;\r
  case 0x13:\r
    ModeStr = "svc";\r
    break;\r
  case 0x16:\r
    ModeStr = "mon";\r
    break;\r
  case 0x17:\r
    ModeStr = "abt";\r
    break;\r
  case 0x1b:\r
    ModeStr = "und";\r
    break;\r
  case 0x1f:\r
    ModeStr = "sys";\r
    break;\r
\r
  default:\r
    ModeStr = "???";\r
    break;\r
  }\r
\r
  AsciiStrCat (Str, ModeStr);\r
  return;\r
}\r
\r
CHAR8 *\r
FaultStatusToString (\r
  IN  UINT32  Status\r
  )\r
{\r
  CHAR8 *FaultSource;\r
\r
  switch (Status) {\r
    case 0x01: FaultSource = "Alignment fault"; break;\r
    case 0x02: FaultSource = "Debug event fault"; break;\r
    case 0x03: FaultSource = "Access Flag fault on Section"; break;\r
    case 0x04: FaultSource = "Cache maintenance operation fault[2]"; break;\r
    case 0x05: FaultSource = "Translation fault on Section"; break;\r
    case 0x06: FaultSource = "Access Flag fault on Page"; break;\r
    case 0x07: FaultSource = "Translation fault on Page"; break;\r
    case 0x08: FaultSource = "Precise External Abort"; break;\r
    case 0x09: FaultSource = "Domain fault on Section"; break;\r
    case 0x0b: FaultSource = "Domain fault on Page"; break;\r
    case 0x0c: FaultSource = "External abort on translation, first level"; break;\r
    case 0x0d: FaultSource = "Permission fault on Section"; break;\r
    case 0x0e: FaultSource = "External abort on translation, second level"; break;\r
    case 0x0f: FaultSource = "Permission fault on Page"; break;\r
    case 0x16: FaultSource = "Imprecise External Abort"; break;\r
    default:   FaultSource = "No function"; break;\r
    }\r
\r
  return FaultSource;\r
}\r
\r
STATIC CHAR8 *gExceptionTypeString[] = {\r
  "Reset",\r
  "Undefined OpCode",\r
  "SVC",\r
  "Prefetch Abort",\r
  "Data Abort",\r
  "Undefined",\r
  "IRQ",\r
  "FIQ"\r
};\r
\r
/**\r
  This is the default action to take on an unexpected exception\r
\r
  Since this is exception context don't do anything crazy like try to allcoate memory.\r
\r
  @param  ExceptionType    Type of the exception\r
  @param  SystemContext    Register state at the time of the Exception\r
\r
\r
**/\r
VOID\r
DefaultExceptionHandler (\r
  IN     EFI_EXCEPTION_TYPE           ExceptionType,\r
  IN OUT EFI_SYSTEM_CONTEXT           SystemContext\r
  )\r
{\r
  CHAR8     Buffer[100];\r
  UINTN     CharCount;\r
  UINT32    DfsrStatus;\r
  UINT32    IfsrStatus;\r
  BOOLEAN   DfsrWrite;\r
  UINT32    PcAdjust = 0;\r
\r
  CharCount = AsciiSPrint (Buffer,sizeof (Buffer),"\n%a Exception PC at 0x%08x  CPSR 0x%08x ",\r
         gExceptionTypeString[ExceptionType], SystemContext.SystemContextArm->PC, SystemContext.SystemContextArm->CPSR);\r
  SerialPortWrite ((UINT8 *) Buffer, CharCount);\r
\r
  DEBUG_CODE_BEGIN ();\r
    CHAR8   *Pdb;\r
    UINT32  ImageBase;\r
    UINT32  PeCoffSizeOfHeader;\r
    UINT32  Offset;\r
    CHAR8   CpsrStr[32];  // char per bit. Lower 5-bits are mode that is a 3 char string\r
    CHAR8   Buffer[80];\r
    UINT8   *DisAsm;\r
    UINT32  ItBlock;\r
\r
    CpsrString (SystemContext.SystemContextArm->CPSR, CpsrStr);\r
    DEBUG ((EFI_D_ERROR, "%a\n", CpsrStr));\r
\r
    Pdb = GetImageName (SystemContext.SystemContextArm->PC, &ImageBase, &PeCoffSizeOfHeader);\r
    Offset = SystemContext.SystemContextArm->PC - ImageBase;\r
    if (Pdb != NULL) {\r
      DEBUG ((EFI_D_ERROR, "%a\n", Pdb));\r
\r
      //\r
      // A PE/COFF image loads its headers into memory so the headers are\r
      // included in the linked addresses. ELF and Mach-O images do not\r
      // include the headers so the first byte of the image is usually\r
      // text (code). If you look at link maps from ELF or Mach-O images\r
      // you need to subtract out the size of the PE/COFF header to get\r
      // get the offset that matches the link map.\r
      //\r
      DEBUG ((EFI_D_ERROR, "loaded at 0x%08x (PE/COFF offset) 0x%x (ELF or Mach-O offset) 0x%x", ImageBase, Offset, Offset - PeCoffSizeOfHeader));\r
\r
      // If we come from an image it is safe to show the instruction. We know it should not fault\r
      DisAsm = (UINT8 *)(UINTN)SystemContext.SystemContextArm->PC;\r
      ItBlock = 0;\r
      DisassembleInstruction (&DisAsm, (SystemContext.SystemContextArm->CPSR & BIT5) == BIT5, TRUE, &ItBlock, Buffer, sizeof (Buffer));\r
      DEBUG ((EFI_D_ERROR, "\n%a", Buffer));\r
\r
      switch (ExceptionType) {\r
      case EXCEPT_ARM_UNDEFINED_INSTRUCTION:\r
      case EXCEPT_ARM_SOFTWARE_INTERRUPT:\r
      case EXCEPT_ARM_PREFETCH_ABORT:\r
      case EXCEPT_ARM_DATA_ABORT:\r
        // advance PC past the faulting instruction\r
        PcAdjust = (UINTN)DisAsm - SystemContext.SystemContextArm->PC;\r
        break;\r
\r
      default:\r
        break;\r
      }\r
\r
    }\r
  DEBUG_CODE_END ();\r
  DEBUG ((EFI_D_ERROR, "\n  R0 0x%08x   R1 0x%08x   R2 0x%08x   R3 0x%08x\n", SystemContext.SystemContextArm->R0, SystemContext.SystemContextArm->R1, SystemContext.SystemContextArm->R2, SystemContext.SystemContextArm->R3));\r
  DEBUG ((EFI_D_ERROR, "  R4 0x%08x   R5 0x%08x   R6 0x%08x   R7 0x%08x\n", SystemContext.SystemContextArm->R4, SystemContext.SystemContextArm->R5, SystemContext.SystemContextArm->R6, SystemContext.SystemContextArm->R7));\r
  DEBUG ((EFI_D_ERROR, "  R8 0x%08x   R9 0x%08x  R10 0x%08x  R11 0x%08x\n", SystemContext.SystemContextArm->R8, SystemContext.SystemContextArm->R9, SystemContext.SystemContextArm->R10, SystemContext.SystemContextArm->R11));\r
  DEBUG ((EFI_D_ERROR, " R12 0x%08x   SP 0x%08x   LR 0x%08x   PC 0x%08x\n", SystemContext.SystemContextArm->R12, SystemContext.SystemContextArm->SP, SystemContext.SystemContextArm->LR, SystemContext.SystemContextArm->PC));\r
  DEBUG ((EFI_D_ERROR, "DFSR 0x%08x DFAR 0x%08x IFSR 0x%08x IFAR 0x%08x\n", SystemContext.SystemContextArm->DFSR, SystemContext.SystemContextArm->DFAR, SystemContext.SystemContextArm->IFSR, SystemContext.SystemContextArm->IFAR));\r
\r
  // Bit10 is Status[4] Bit3:0 is Status[3:0]\r
  DfsrStatus = (SystemContext.SystemContextArm->DFSR & 0xf) | ((SystemContext.SystemContextArm->DFSR >> 6) & 0x10);\r
  DfsrWrite = (SystemContext.SystemContextArm->DFSR & BIT11) != 0;\r
  if (DfsrStatus != 0x00) {\r
    DEBUG ((EFI_D_ERROR, " %a: %a 0x%08x\n", FaultStatusToString (DfsrStatus), DfsrWrite ? "write to" : "read from", SystemContext.SystemContextArm->DFAR));\r
  }\r
\r
  IfsrStatus = (SystemContext.SystemContextArm->IFSR & 0xf) | ((SystemContext.SystemContextArm->IFSR >> 6) & 0x10);\r
  if (IfsrStatus != 0) {\r
    DEBUG ((EFI_D_ERROR, " Instruction %a at 0x%08x\n", FaultStatusToString (SystemContext.SystemContextArm->IFSR & 0xf), SystemContext.SystemContextArm->IFAR));\r
  }\r
\r
  DEBUG ((EFI_D_ERROR, "\n"));\r
  ASSERT (FALSE);\r
\r
  // Clear the error registers that we have already displayed incase some one wants to keep going\r
  SystemContext.SystemContextArm->DFSR = 0;\r
  SystemContext.SystemContextArm->IFSR = 0;\r
\r
  // If some one is stepping past the exception handler adjust the PC to point to the next instruction\r
  SystemContext.SystemContextArm->PC += PcAdjust;\r
}\r
Commit	Line	Data
	1	/** @file\r
	2	Default exception handler\r
	3	\r
	4	Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>\r
	5	Copyright (c) 2012, ARM Ltd. All rights reserved.<BR>\r
	6	\r
	7	This program and the accompanying materials\r
	8	are licensed and made available under the terms and conditions of the BSD License\r
	9	which accompanies this distribution. The full text of the license may be found at\r
	10	http://opensource.org/licenses/bsd-license.php\r
	11	\r
	12	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	13	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	14	\r
	15	**/\r
	16	\r
	17	#include <Uefi.h>\r
	18	#include <Library/BaseLib.h>\r
	19	#include <Library/DebugLib.h>\r
	20	#include <Library/PeCoffGetEntryPointLib.h>\r
	21	#include <Library/PrintLib.h>\r
	22	#include <Library/ArmDisassemblerLib.h>\r
	23	#include <Library/SerialPortLib.h>\r
	24	\r
	25	#include <Guid/DebugImageInfoTable.h>\r
	26	\r
	27	#include <Protocol/DebugSupport.h>\r
	28	#include <Library/DefaultExceptionHandlerLib.h>\r
	29	\r
	30	typedef struct {\r
	31	UINT32 BIT;\r
	32	CHAR8 Char;\r
	33	} CPSR_CHAR;\r
	34	\r
	35	CHAR8 *\r
	36	GetImageName (\r
	37	IN UINTN FaultAddress,\r
	38	OUT UINTN *ImageBase,\r
	39	OUT UINTN *PeCoffSizeOfHeaders\r
	40	);\r
	41	\r
	42	/**\r
	43	Convert the Current Program Status Register (CPSR) to a string. The string is\r
	44	a defacto standard in the ARM world.\r
	45	\r
	46	It is possible to add extra bits by adding them to CpsrChar array.\r
	47	\r
	48	@param Cpsr ARM CPSR register value\r
	49	@param ReturnStr 32 byte string that contains string version of CPSR\r
	50	\r
	51	**/\r
	52	VOID\r
	53	CpsrString (\r
	54	IN UINT32 Cpsr,\r
	55	OUT CHAR8 *ReturnStr\r
	56	)\r
	57	{\r
	58	UINTN Index;\r
	59	CHAR8* Str;\r
	60	CHAR8* ModeStr;\r
	61	CPSR_CHAR CpsrChar[] = {\r
	62	{ 31, 'n' },\r
	63	{ 30, 'z' },\r
	64	{ 29, 'c' },\r
	65	{ 28, 'v' },\r
	66	\r
	67	{ 9, 'e' },\r
	68	{ 8, 'a' },\r
	69	{ 7, 'i' },\r
	70	{ 6, 'f' },\r
	71	{ 5, 't' },\r
	72	{ 0, '?' }\r
	73	};\r
	74	\r
	75	Str = ReturnStr;\r
	76	\r
	77	for (Index = 0; CpsrChar[Index].BIT != 0; Index++, Str++) {\r
	78	*Str = CpsrChar[Index].Char;\r
	79	if ((Cpsr & (1 << CpsrChar[Index].BIT)) != 0) {\r
	80	// Concert to upper case if bit is set\r
	81	*Str &= ~0x20;\r
	82	}\r
	83	}\r
	84	\r
	85	*Str++ = '_';\r
	86	*Str = '\0';\r
	87	\r
	88	switch (Cpsr & 0x1f) {\r
	89	case 0x10:\r
	90	ModeStr = "usr";\r
	91	break;\r
	92	case 0x011:\r
	93	ModeStr = "fiq";\r
	94	break;\r
	95	case 0x12:\r
	96	ModeStr = "irq";\r
	97	break;\r
	98	case 0x13:\r
	99	ModeStr = "svc";\r
	100	break;\r
	101	case 0x16:\r
	102	ModeStr = "mon";\r
	103	break;\r
	104	case 0x17:\r
	105	ModeStr = "abt";\r
	106	break;\r
	107	case 0x1b:\r
	108	ModeStr = "und";\r
	109	break;\r
	110	case 0x1f:\r
	111	ModeStr = "sys";\r
	112	break;\r
	113	\r
	114	default:\r
	115	ModeStr = "???";\r
	116	break;\r
	117	}\r
	118	\r
	119	AsciiStrCat (Str, ModeStr);\r
	120	return;\r
	121	}\r
	122	\r
	123	CHAR8 *\r
	124	FaultStatusToString (\r
	125	IN UINT32 Status\r
	126	)\r
	127	{\r
	128	CHAR8 *FaultSource;\r
	129	\r
	130	switch (Status) {\r
	131	case 0x01: FaultSource = "Alignment fault"; break;\r
	132	case 0x02: FaultSource = "Debug event fault"; break;\r
	133	case 0x03: FaultSource = "Access Flag fault on Section"; break;\r
	134	case 0x04: FaultSource = "Cache maintenance operation fault[2]"; break;\r
	135	case 0x05: FaultSource = "Translation fault on Section"; break;\r
	136	case 0x06: FaultSource = "Access Flag fault on Page"; break;\r
	137	case 0x07: FaultSource = "Translation fault on Page"; break;\r
	138	case 0x08: FaultSource = "Precise External Abort"; break;\r
	139	case 0x09: FaultSource = "Domain fault on Section"; break;\r
	140	case 0x0b: FaultSource = "Domain fault on Page"; break;\r
	141	case 0x0c: FaultSource = "External abort on translation, first level"; break;\r
	142	case 0x0d: FaultSource = "Permission fault on Section"; break;\r
	143	case 0x0e: FaultSource = "External abort on translation, second level"; break;\r
	144	case 0x0f: FaultSource = "Permission fault on Page"; break;\r
	145	case 0x16: FaultSource = "Imprecise External Abort"; break;\r
	146	default: FaultSource = "No function"; break;\r
	147	}\r
	148	\r
	149	return FaultSource;\r
	150	}\r
	151	\r
	152	STATIC CHAR8 *gExceptionTypeString[] = {\r
	153	"Reset",\r
	154	"Undefined OpCode",\r
	155	"SVC",\r
	156	"Prefetch Abort",\r
	157	"Data Abort",\r
	158	"Undefined",\r
	159	"IRQ",\r
	160	"FIQ"\r
	161	};\r
	162	\r
	163	/**\r
	164	This is the default action to take on an unexpected exception\r
	165	\r
	166	Since this is exception context don't do anything crazy like try to allcoate memory.\r
	167	\r
	168	@param ExceptionType Type of the exception\r
	169	@param SystemContext Register state at the time of the Exception\r
	170	\r
	171	\r
	172	**/\r
	173	VOID\r
	174	DefaultExceptionHandler (\r
	175	IN EFI_EXCEPTION_TYPE ExceptionType,\r
	176	IN OUT EFI_SYSTEM_CONTEXT SystemContext\r
	177	)\r
	178	{\r
	179	CHAR8 Buffer[100];\r
	180	UINTN CharCount;\r
	181	UINT32 DfsrStatus;\r
	182	UINT32 IfsrStatus;\r
	183	BOOLEAN DfsrWrite;\r
	184	UINT32 PcAdjust = 0;\r
	185	\r
	186	CharCount = AsciiSPrint (Buffer,sizeof (Buffer),"\n%a Exception PC at 0x%08x CPSR 0x%08x ",\r
	187	gExceptionTypeString[ExceptionType], SystemContext.SystemContextArm->PC, SystemContext.SystemContextArm->CPSR);\r
	188	SerialPortWrite ((UINT8 *) Buffer, CharCount);\r
	189	\r
	190	DEBUG_CODE_BEGIN ();\r
	191	CHAR8 *Pdb;\r
	192	UINT32 ImageBase;\r
	193	UINT32 PeCoffSizeOfHeader;\r
	194	UINT32 Offset;\r
	195	CHAR8 CpsrStr[32]; // char per bit. Lower 5-bits are mode that is a 3 char string\r
	196	CHAR8 Buffer[80];\r
	197	UINT8 *DisAsm;\r
	198	UINT32 ItBlock;\r
	199	\r
	200	CpsrString (SystemContext.SystemContextArm->CPSR, CpsrStr);\r
	201	DEBUG ((EFI_D_ERROR, "%a\n", CpsrStr));\r
	202	\r
	203	Pdb = GetImageName (SystemContext.SystemContextArm->PC, &ImageBase, &PeCoffSizeOfHeader);\r
	204	Offset = SystemContext.SystemContextArm->PC - ImageBase;\r
	205	if (Pdb != NULL) {\r
	206	DEBUG ((EFI_D_ERROR, "%a\n", Pdb));\r
	207	\r
	208	//\r
	209	// A PE/COFF image loads its headers into memory so the headers are\r
	210	// included in the linked addresses. ELF and Mach-O images do not\r
	211	// include the headers so the first byte of the image is usually\r
	212	// text (code). If you look at link maps from ELF or Mach-O images\r
	213	// you need to subtract out the size of the PE/COFF header to get\r
	214	// get the offset that matches the link map.\r
	215	//\r
	216	DEBUG ((EFI_D_ERROR, "loaded at 0x%08x (PE/COFF offset) 0x%x (ELF or Mach-O offset) 0x%x", ImageBase, Offset, Offset - PeCoffSizeOfHeader));\r
	217	\r
	218	// If we come from an image it is safe to show the instruction. We know it should not fault\r
	219	DisAsm = (UINT8 *)(UINTN)SystemContext.SystemContextArm->PC;\r
	220	ItBlock = 0;\r
	221	DisassembleInstruction (&DisAsm, (SystemContext.SystemContextArm->CPSR & BIT5) == BIT5, TRUE, &ItBlock, Buffer, sizeof (Buffer));\r
	222	DEBUG ((EFI_D_ERROR, "\n%a", Buffer));\r
	223	\r
	224	switch (ExceptionType) {\r
	225	case EXCEPT_ARM_UNDEFINED_INSTRUCTION:\r
	226	case EXCEPT_ARM_SOFTWARE_INTERRUPT:\r
	227	case EXCEPT_ARM_PREFETCH_ABORT:\r
	228	case EXCEPT_ARM_DATA_ABORT:\r
	229	// advance PC past the faulting instruction\r
	230	PcAdjust = (UINTN)DisAsm - SystemContext.SystemContextArm->PC;\r
	231	break;\r
	232	\r
	233	default:\r
	234	break;\r
	235	}\r
	236	\r
	237	}\r
	238	DEBUG_CODE_END ();\r
	239	DEBUG ((EFI_D_ERROR, "\n R0 0x%08x R1 0x%08x R2 0x%08x R3 0x%08x\n", SystemContext.SystemContextArm->R0, SystemContext.SystemContextArm->R1, SystemContext.SystemContextArm->R2, SystemContext.SystemContextArm->R3));\r
	240	DEBUG ((EFI_D_ERROR, " R4 0x%08x R5 0x%08x R6 0x%08x R7 0x%08x\n", SystemContext.SystemContextArm->R4, SystemContext.SystemContextArm->R5, SystemContext.SystemContextArm->R6, SystemContext.SystemContextArm->R7));\r
	241	DEBUG ((EFI_D_ERROR, " R8 0x%08x R9 0x%08x R10 0x%08x R11 0x%08x\n", SystemContext.SystemContextArm->R8, SystemContext.SystemContextArm->R9, SystemContext.SystemContextArm->R10, SystemContext.SystemContextArm->R11));\r
	242	DEBUG ((EFI_D_ERROR, " R12 0x%08x SP 0x%08x LR 0x%08x PC 0x%08x\n", SystemContext.SystemContextArm->R12, SystemContext.SystemContextArm->SP, SystemContext.SystemContextArm->LR, SystemContext.SystemContextArm->PC));\r
	243	DEBUG ((EFI_D_ERROR, "DFSR 0x%08x DFAR 0x%08x IFSR 0x%08x IFAR 0x%08x\n", SystemContext.SystemContextArm->DFSR, SystemContext.SystemContextArm->DFAR, SystemContext.SystemContextArm->IFSR, SystemContext.SystemContextArm->IFAR));\r
	244	\r
	245	// Bit10 is Status[4] Bit3:0 is Status[3:0]\r
	246	DfsrStatus = (SystemContext.SystemContextArm->DFSR & 0xf) \| ((SystemContext.SystemContextArm->DFSR >> 6) & 0x10);\r
	247	DfsrWrite = (SystemContext.SystemContextArm->DFSR & BIT11) != 0;\r
	248	if (DfsrStatus != 0x00) {\r
	249	DEBUG ((EFI_D_ERROR, " %a: %a 0x%08x\n", FaultStatusToString (DfsrStatus), DfsrWrite ? "write to" : "read from", SystemContext.SystemContextArm->DFAR));\r
	250	}\r
	251	\r
	252	IfsrStatus = (SystemContext.SystemContextArm->IFSR & 0xf) \| ((SystemContext.SystemContextArm->IFSR >> 6) & 0x10);\r
	253	if (IfsrStatus != 0) {\r
	254	DEBUG ((EFI_D_ERROR, " Instruction %a at 0x%08x\n", FaultStatusToString (SystemContext.SystemContextArm->IFSR & 0xf), SystemContext.SystemContextArm->IFAR));\r
	255	}\r
	256	\r
	257	DEBUG ((EFI_D_ERROR, "\n"));\r
	258	ASSERT (FALSE);\r
	259	\r
	260	// Clear the error registers that we have already displayed incase some one wants to keep going\r
	261	SystemContext.SystemContextArm->DFSR = 0;\r
	262	SystemContext.SystemContextArm->IFSR = 0;\r
	263	\r
	264	// If some one is stepping past the exception handler adjust the PC to point to the next instruction\r
	265	SystemContext.SystemContextArm->PC += PcAdjust;\r
	266	}\r