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

/** @file\r
  Default exception handler\r
\r
  Copyright (c) 2008 - 2010, Apple Inc. 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/UefiLib.h>\r
#include <Library/BaseLib.h>\r
#include <Library/DebugLib.h>\r
#include <Library/PeCoffGetEntryPointLib.h>\r
#include <Library/ArmDisassemblerLib.h>\r
\r
#include <Guid/DebugImageInfoTable.h>\r
#include <Protocol/DebugSupport.h>\r
#include <Protocol/LoadedImage.h>\r
\r
\r
EFI_DEBUG_IMAGE_INFO_TABLE_HEADER *gDebugImageTableHeader = NULL;\r
\r
\r
typedef struct {\r
  UINT32  BIT;\r
  CHAR8   Char;\r
} CPSR_CHAR;\r
\r
 \r
/**\r
  Use the EFI Debug Image Table to lookup the FaultAddress and find which PE/COFF image \r
  it came from. As long as the PE/COFF image contains a debug directory entry a \r
  string can be returned. For ELF and Mach-O images the string points to the Mach-O or ELF\r
  image. Microsoft tools contain a pointer to the PDB file that contains the debug information.\r
\r
  @param  FaultAddress         Address to find PE/COFF image for. \r
  @param  ImageBase            Return load address of found image\r
  @param  PeCoffSizeOfHeaders  Return the size of the PE/COFF header for the image that was found\r
\r
  @retval NULL                 FaultAddress not in a loaded PE/COFF image.\r
  @retval                      Path and file name of PE/COFF image.\r
  \r
**/\r
CHAR8 *\r
GetImageName (\r
  IN  UINT32  FaultAddress,\r
  OUT UINT32  *ImageBase,\r
  OUT UINT32  *PeCoffSizeOfHeaders\r
  )\r
{\r
  EFI_DEBUG_IMAGE_INFO  *DebugTable;\r
  UINTN                 Entry;\r
  CHAR8                 *Address;\r
\r
  DebugTable = gDebugImageTableHeader->EfiDebugImageInfoTable;\r
  if (DebugTable == NULL) {\r
    return NULL;\r
  }\r
\r
  Address = (CHAR8 *)(UINTN)FaultAddress;\r
  for (Entry = 0; Entry < gDebugImageTableHeader->TableSize; Entry++, DebugTable++) {\r
    if (DebugTable->NormalImage != NULL) {\r
      if ((DebugTable->NormalImage->ImageInfoType == EFI_DEBUG_IMAGE_INFO_TYPE_NORMAL) && \r
          (DebugTable->NormalImage->LoadedImageProtocolInstance != NULL)) {\r
        if ((Address >= (CHAR8 *)DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase) &&\r
            (Address <= ((CHAR8 *)DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase + DebugTable->NormalImage->LoadedImageProtocolInstance->ImageSize))) {\r
          *ImageBase = (UINT32)DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase;\r
          *PeCoffSizeOfHeaders = PeCoffGetSizeOfHeaders ((VOID *)(UINTN)*ImageBase);\r
          return PeCoffLoaderGetPdbPointer (DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase);\r
        }           \r
      }\r
    }  \r
  }\r
\r
  return NULL;\r
}\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
  "SWI",\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
  UINT32    DfsrStatus;\r
  UINT32    IfsrStatus;\r
  BOOLEAN   DfsrWrite;\r
  UINT32    PcAdjust = 0;\r
\r
  Print(L"\n%a Exception PC at 0x%08x  CPSR 0x%08x ", gExceptionTypeString[ExceptionType], SystemContext.SystemContextArm->PC, SystemContext.SystemContextArm->CPSR);\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
\r
\r
\r
\r
/**\r
  The constructor function caches EFI Debug table information for use in the exception handler.\r
  \r
\r
  @param  ImageHandle   The firmware allocated handle for the EFI image.\r
  @param  SystemTable   A pointer to the EFI System Table.\r
  \r
  @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
DefaultExceptionHandlerConstructor (\r
  IN EFI_HANDLE                ImageHandle,\r
  IN EFI_SYSTEM_TABLE          *SystemTable\r
  )\r
{\r
  EFI_STATUS  Status;\r
  \r
  \r
  Status = EfiGetSystemConfigurationTable (&gEfiDebugImageInfoTableGuid, (VOID **)&gDebugImageTableHeader);\r
  if (EFI_ERROR (Status)) {\r
    gDebugImageTableHeader = NULL;\r
  }\r
  return Status;\r
}\r
Commit	Line	Data
6f72e28d	1	/** @file\r
	2	Default exception handler\r
	3	\r
d6ebcab7	4	Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>\r
6f72e28d	5	\r
d6ebcab7	6	This program and the accompanying materials\r
6f72e28d	7	are licensed and made available under the terms and conditions of the BSD License\r
	8	which accompanies this distribution. The full text of the license may be found at\r
	9	http://opensource.org/licenses/bsd-license.php\r
	10	\r
	11	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	12	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	13	\r
	14	**/\r
	15	\r
	16	#include <Uefi.h>\r
	17	#include <Library/UefiLib.h>\r
	18	#include <Library/BaseLib.h>\r
	19	#include <Library/DebugLib.h>\r
	20	#include <Library/PeCoffGetEntryPointLib.h>\r
097bd461	21	#include <Library/ArmDisassemblerLib.h>\r
6f72e28d	22	\r
	23	#include <Guid/DebugImageInfoTable.h>\r
	24	#include <Protocol/DebugSupport.h>\r
	25	#include <Protocol/LoadedImage.h>\r
	26	\r
	27	\r
6f72e28d	28	EFI_DEBUG_IMAGE_INFO_TABLE_HEADER *gDebugImageTableHeader = NULL;\r
	29	\r
	30	\r
	31	typedef struct {\r
	32	UINT32 BIT;\r
	33	CHAR8 Char;\r
	34	} CPSR_CHAR;\r
	35	\r
6f72e28d	36	\r
	37	/**\r
	38	Use the EFI Debug Image Table to lookup the FaultAddress and find which PE/COFF image \r
	39	it came from. As long as the PE/COFF image contains a debug directory entry a \r
	40	string can be returned. For ELF and Mach-O images the string points to the Mach-O or ELF\r
	41	image. Microsoft tools contain a pointer to the PDB file that contains the debug information.\r
	42	\r
	43	@param FaultAddress Address to find PE/COFF image for. \r
	44	@param ImageBase Return load address of found image\r
	45	@param PeCoffSizeOfHeaders Return the size of the PE/COFF header for the image that was found\r
	46	\r
	47	@retval NULL FaultAddress not in a loaded PE/COFF image.\r
	48	@retval Path and file name of PE/COFF image.\r
	49	\r
	50	**/\r
	51	CHAR8 *\r
	52	GetImageName (\r
	53	IN UINT32 FaultAddress,\r
	54	OUT UINT32 *ImageBase,\r
	55	OUT UINT32 *PeCoffSizeOfHeaders\r
	56	)\r
	57	{\r
	58	EFI_DEBUG_IMAGE_INFO *DebugTable;\r
	59	UINTN Entry;\r
	60	CHAR8 *Address;\r
	61	\r
6f72e28d	62	DebugTable = gDebugImageTableHeader->EfiDebugImageInfoTable;\r
	63	if (DebugTable == NULL) {\r
	64	return NULL;\r
	65	}\r
	66	\r
	67	Address = (CHAR8 *)(UINTN)FaultAddress;\r
	68	for (Entry = 0; Entry < gDebugImageTableHeader->TableSize; Entry++, DebugTable++) {\r
	69	if (DebugTable->NormalImage != NULL) {\r
	70	if ((DebugTable->NormalImage->ImageInfoType == EFI_DEBUG_IMAGE_INFO_TYPE_NORMAL) && \r
	71	(DebugTable->NormalImage->LoadedImageProtocolInstance != NULL)) {\r
	72	if ((Address >= (CHAR8 *)DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase) &&\r
	73	(Address <= ((CHAR8 *)DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase + DebugTable->NormalImage->LoadedImageProtocolInstance->ImageSize))) {\r
	74	*ImageBase = (UINT32)DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase;\r
	75	PeCoffSizeOfHeaders = PeCoffGetSizeOfHeaders ((VOID )(UINTN)*ImageBase);\r
	76	return PeCoffLoaderGetPdbPointer (DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase);\r
	77	} \r
	78	}\r
	79	} \r
	80	}\r
	81	\r
	82	return NULL;\r
	83	}\r
	84	\r
	85	\r
	86	/**\r
	87	Convert the Current Program Status Register (CPSR) to a string. The string is \r
	88	a defacto standard in the ARM world. \r
	89	\r
	90	It is possible to add extra bits by adding them to CpsrChar array.\r
	91	\r
	92	@param Cpsr ARM CPSR register value\r
	93	@param ReturnStr 32 byte string that contains string version of CPSR\r
	94	\r
	95	**/\r
	96	VOID\r
	97	CpsrString (\r
	98	IN UINT32 Cpsr,\r
	99	OUT CHAR8 *ReturnStr\r
	100	)\r
	101	{\r
11c20f4e	102	UINTN Index;\r
	103	CHAR8* Str;\r
	104	CHAR8* ModeStr;\r
6f72e28d	105	CPSR_CHAR CpsrChar[] = {\r
	106	{ 31, 'n' },\r
	107	{ 30, 'z' },\r
	108	{ 29, 'c' },\r
	109	{ 28, 'v' },\r
	110	\r
	111	{ 9, 'e' },\r
	112	{ 8, 'a' },\r
	113	{ 7, 'i' },\r
	114	{ 6, 'f' },\r
	115	{ 5, 't' },\r
	116	{ 0, '?' }\r
	117	};\r
	118	\r
11c20f4e	119	Str = ReturnStr;\r
11c20f4e	120	\r
6f72e28d	121	for (Index = 0; CpsrChar[Index].BIT != 0; Index++, Str++) {\r
	122	*Str = CpsrChar[Index].Char;\r
	123	if ((Cpsr & (1 << CpsrChar[Index].BIT)) != 0) {\r
	124	// Concert to upper case if bit is set\r
	125	*Str &= ~0x20;\r
	126	}\r
	127	}\r
	128	\r
	129	*Str++ = '_';\r
	130	*Str = '\0';\r
	131	\r
	132	switch (Cpsr & 0x1f) {\r
	133	case 0x10:\r
	134	ModeStr = "usr";\r
	135	break;\r
	136	case 0x011:\r
	137	ModeStr = "fiq";\r
	138	break;\r
	139	case 0x12:\r
	140	ModeStr = "irq";\r
	141	break;\r
	142	case 0x13:\r
	143	ModeStr = "svc";\r
	144	break;\r
	145	case 0x16:\r
	146	ModeStr = "mon";\r
	147	break;\r
	148	case 0x17:\r
	149	ModeStr = "abt";\r
	150	break;\r
	151	case 0x1b:\r
	152	ModeStr = "und";\r
	153	break;\r
	154	case 0x1f:\r
	155	ModeStr = "sys";\r
	156	break;\r
	157	\r
	158	default:\r
	159	ModeStr = "???";\r
	160	break;\r
	161	}\r
	162	\r
	163	AsciiStrCat (Str, ModeStr);\r
	164	return;\r
	165	} \r
d5b0f232	166	\r
	167	CHAR8 *\r
	168	FaultStatusToString (\r
	169	IN UINT32 Status\r
	170	)\r
	171	{\r
	172	CHAR8 *FaultSource;\r
	173	\r
	174	switch (Status) {\r
	175	case 0x01: FaultSource = "Alignment fault"; break;\r
	176	case 0x02: FaultSource = "Debug event fault"; break;\r
	177	case 0x03: FaultSource = "Access Flag fault on Section"; break;\r
	178	case 0x04: FaultSource = "Cache maintenance operation fault[2]"; break;\r
	179	case 0x05: FaultSource = "Translation fault on Section"; break;\r
	180	case 0x06: FaultSource = "Access Flag fault on Page"; break;\r
	181	case 0x07: FaultSource = "Translation fault on Page"; break;\r
	182	case 0x08: FaultSource = "Precise External Abort"; break;\r
	183	case 0x09: FaultSource = "Domain fault on Section"; break;\r
	184	case 0x0b: FaultSource = "Domain fault on Page"; break;\r
	185	case 0x0c: FaultSource = "External abort on translation, first level"; break;\r
	186	case 0x0d: FaultSource = "Permission fault on Section"; break;\r
	187	case 0x0e: FaultSource = "External abort on translation, second level"; break;\r
	188	case 0x0f: FaultSource = "Permission fault on Page"; break;\r
	189	case 0x16: FaultSource = "Imprecise External Abort"; break;\r
	190	default: FaultSource = "No function"; break;\r
	191	}\r
	192	\r
	193	return FaultSource;\r
	194	}\r
	195	\r
11c20f4e	196	STATIC CHAR8 *gExceptionTypeString[] = {\r
6f72e28d	197	"Reset",\r
	198	"Undefined OpCode",\r
	199	"SWI",\r
	200	"Prefetch Abort",\r
	201	"Data Abort",\r
	202	"Undefined",\r
	203	"IRQ",\r
	204	"FIQ"\r
	205	};\r
	206	\r
6f72e28d	207	/**\r
	208	This is the default action to take on an unexpected exception\r
	209	\r
	210	Since this is exception context don't do anything crazy like try to allcoate memory.\r
	211	\r
	212	@param ExceptionType Type of the exception\r
	213	@param SystemContext Register state at the time of the Exception\r
	214	\r
	215	\r
	216	**/\r
	217	VOID\r
	218	DefaultExceptionHandler (\r
	219	IN EFI_EXCEPTION_TYPE ExceptionType,\r
	220	IN OUT EFI_SYSTEM_CONTEXT SystemContext\r
	221	)\r
	222	{\r
d5b0f232	223	UINT32 DfsrStatus;\r
65e27445	224	UINT32 IfsrStatus;\r
d5b0f232	225	BOOLEAN DfsrWrite;\r
d629c283	226	UINT32 PcAdjust = 0;\r
6f72e28d	227	\r
11c20f4e	228	Print(L"\n%a Exception PC at 0x%08x CPSR 0x%08x ", gExceptionTypeString[ExceptionType], SystemContext.SystemContextArm->PC, SystemContext.SystemContextArm->CPSR);\r
6f72e28d	229	DEBUG_CODE_BEGIN ();\r
	230	CHAR8 *Pdb;\r
	231	UINT32 ImageBase;\r
	232	UINT32 PeCoffSizeOfHeader;\r
	233	UINT32 Offset;\r
	234	CHAR8 CpsrStr[32]; // char per bit. Lower 5-bits are mode that is a 3 char string\r
	235	CHAR8 Buffer[80];\r
097bd461	236	UINT8 *DisAsm;\r
f3198cba	237	UINT32 ItBlock;\r
6f72e28d	238	\r
	239	CpsrString (SystemContext.SystemContextArm->CPSR, CpsrStr);\r
	240	DEBUG ((EFI_D_ERROR, "%a\n", CpsrStr));\r
	241	\r
	242	Pdb = GetImageName (SystemContext.SystemContextArm->PC, &ImageBase, &PeCoffSizeOfHeader);\r
	243	Offset = SystemContext.SystemContextArm->PC - ImageBase;\r
	244	if (Pdb != NULL) {\r
	245	DEBUG ((EFI_D_ERROR, "%a\n", Pdb));\r
	246	\r
	247	//\r
	248	// A PE/COFF image loads its headers into memory so the headers are \r
11c20f4e	249	// included in the linked addresses. ELF and Mach-O images do not\r
6f72e28d	250	// include the headers so the first byte of the image is usually\r
6f72e28d	251	// text (code). If you look at link maps from ELF or Mach-O images\r
11c20f4e	252	// you need to subtract out the size of the PE/COFF header to get\r
6f72e28d	253	// get the offset that matches the link map. \r
	254	//\r
	255	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
	256	\r
	257	// If we come from an image it is safe to show the instruction. We know it should not fault\r
097bd461	258	DisAsm = (UINT8 *)(UINTN)SystemContext.SystemContextArm->PC;\r
f3198cba	259	ItBlock = 0;\r
f3198cba	260	DisassembleInstruction (&DisAsm, (SystemContext.SystemContextArm->CPSR & BIT5) == BIT5, TRUE, &ItBlock, Buffer, sizeof (Buffer));\r
097bd461	261	DEBUG ((EFI_D_ERROR, "\n%a", Buffer));\r
d629c283	262	\r
	263	switch (ExceptionType) {\r
	264	case EXCEPT_ARM_UNDEFINED_INSTRUCTION:\r
	265	case EXCEPT_ARM_SOFTWARE_INTERRUPT:\r
	266	case EXCEPT_ARM_PREFETCH_ABORT:\r
	267	case EXCEPT_ARM_DATA_ABORT:\r
	268	// advance PC past the faulting instruction\r
	269	PcAdjust = (UINTN)DisAsm - SystemContext.SystemContextArm->PC;\r
	270	break;\r
	271	\r
	272	default:\r
	273	break;\r
	274	}\r
097bd461	275	\r
6f72e28d	276	}\r
	277	DEBUG_CODE_END ();\r
	278	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
	279	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
	280	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
	281	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
d5b0f232	282	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
	283	\r
	284	// Bit10 is Status[4] Bit3:0 is Status[3:0]\r
	285	DfsrStatus = (SystemContext.SystemContextArm->DFSR & 0xf) \| ((SystemContext.SystemContextArm->DFSR >> 6) & 0x10);\r
	286	DfsrWrite = (SystemContext.SystemContextArm->DFSR & BIT11) != 0;\r
	287	if (DfsrStatus != 0x00) {\r
	288	DEBUG ((EFI_D_ERROR, " %a: %a 0x%08x\n", FaultStatusToString (DfsrStatus), DfsrWrite ? "write to" : "read from", SystemContext.SystemContextArm->DFAR));\r
	289	}\r
65e27445	290	\r
	291	IfsrStatus = (SystemContext.SystemContextArm->IFSR & 0xf) \| ((SystemContext.SystemContextArm->IFSR >> 6) & 0x10);\r
	292	if (IfsrStatus != 0) {\r
	293	DEBUG ((EFI_D_ERROR, " Instruction %a at 0x%08x\n", FaultStatusToString (SystemContext.SystemContextArm->IFSR & 0xf), SystemContext.SystemContextArm->IFAR));\r
d5b0f232	294	}\r
6f72e28d	295	\r
d5b0f232	296	DEBUG ((EFI_D_ERROR, "\n"));\r
6f72e28d	297	ASSERT (FALSE);\r
d629c283	298	\r
bb02cb80	299	// Clear the error registers that we have already displayed incase some one wants to keep going\r
	300	SystemContext.SystemContextArm->DFSR = 0;\r
	301	SystemContext.SystemContextArm->IFSR = 0;\r
	302	\r
d629c283	303	// If some one is stepping past the exception handler adjust the PC to point to the next instruction \r
d629c283	304	SystemContext.SystemContextArm->PC += PcAdjust;\r
6f72e28d	305	}\r
	306	\r
	307	\r
	308	\r
	309	\r
	310	/**\r
	311	The constructor function caches EFI Debug table information for use in the exception handler.\r
	312	\r
	313	\r
	314	@param ImageHandle The firmware allocated handle for the EFI image.\r
	315	@param SystemTable A pointer to the EFI System Table.\r
	316	\r
	317	@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.\r
	318	\r
	319	**/\r
	320	EFI_STATUS\r
	321	EFIAPI\r
	322	DefaultExceptionHandlerConstructor (\r
	323	IN EFI_HANDLE ImageHandle,\r
	324	IN EFI_SYSTEM_TABLE *SystemTable\r
	325	)\r
	326	{\r
	327	EFI_STATUS Status;\r
	328	\r
	329	\r
	330	Status = EfiGetSystemConfigurationTable (&gEfiDebugImageInfoTableGuid, (VOID **)&gDebugImageTableHeader);\r
	331	if (EFI_ERROR (Status)) {\r
	332	gDebugImageTableHeader = NULL;\r
	333	}\r
	334	return Status;\r
	335	}\r