[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/PrintLib.h>\r
#include <Library/ArmDisassemblerLib.h>\r
#include <Library/SerialPortLib.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
  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
\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
7755dfd3	21	#include <Library/PrintLib.h>\r
097bd461	22	#include <Library/ArmDisassemblerLib.h>\r
7755dfd3	23	#include <Library/SerialPortLib.h>\r
6f72e28d	24	\r
	25	#include <Guid/DebugImageInfoTable.h>\r
	26	#include <Protocol/DebugSupport.h>\r
	27	#include <Protocol/LoadedImage.h>\r
	28	\r
	29	\r
6f72e28d	30	EFI_DEBUG_IMAGE_INFO_TABLE_HEADER *gDebugImageTableHeader = NULL;\r
	31	\r
	32	\r
	33	typedef struct {\r
	34	UINT32 BIT;\r
	35	CHAR8 Char;\r
	36	} CPSR_CHAR;\r
	37	\r
6f72e28d	38	\r
	39	/**\r
	40	Use the EFI Debug Image Table to lookup the FaultAddress and find which PE/COFF image \r
	41	it came from. As long as the PE/COFF image contains a debug directory entry a \r
	42	string can be returned. For ELF and Mach-O images the string points to the Mach-O or ELF\r
	43	image. Microsoft tools contain a pointer to the PDB file that contains the debug information.\r
	44	\r
	45	@param FaultAddress Address to find PE/COFF image for. \r
	46	@param ImageBase Return load address of found image\r
	47	@param PeCoffSizeOfHeaders Return the size of the PE/COFF header for the image that was found\r
	48	\r
	49	@retval NULL FaultAddress not in a loaded PE/COFF image.\r
	50	@retval Path and file name of PE/COFF image.\r
	51	\r
	52	**/\r
	53	CHAR8 *\r
	54	GetImageName (\r
	55	IN UINT32 FaultAddress,\r
	56	OUT UINT32 *ImageBase,\r
	57	OUT UINT32 *PeCoffSizeOfHeaders\r
	58	)\r
	59	{\r
	60	EFI_DEBUG_IMAGE_INFO *DebugTable;\r
	61	UINTN Entry;\r
	62	CHAR8 *Address;\r
	63	\r
6f72e28d	64	DebugTable = gDebugImageTableHeader->EfiDebugImageInfoTable;\r
	65	if (DebugTable == NULL) {\r
	66	return NULL;\r
	67	}\r
	68	\r
	69	Address = (CHAR8 *)(UINTN)FaultAddress;\r
	70	for (Entry = 0; Entry < gDebugImageTableHeader->TableSize; Entry++, DebugTable++) {\r
	71	if (DebugTable->NormalImage != NULL) {\r
	72	if ((DebugTable->NormalImage->ImageInfoType == EFI_DEBUG_IMAGE_INFO_TYPE_NORMAL) && \r
	73	(DebugTable->NormalImage->LoadedImageProtocolInstance != NULL)) {\r
	74	if ((Address >= (CHAR8 *)DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase) &&\r
	75	(Address <= ((CHAR8 *)DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase + DebugTable->NormalImage->LoadedImageProtocolInstance->ImageSize))) {\r
	76	*ImageBase = (UINT32)DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase;\r
	77	PeCoffSizeOfHeaders = PeCoffGetSizeOfHeaders ((VOID )(UINTN)*ImageBase);\r
	78	return PeCoffLoaderGetPdbPointer (DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase);\r
	79	} \r
	80	}\r
	81	} \r
	82	}\r
	83	\r
	84	return NULL;\r
	85	}\r
	86	\r
	87	\r
	88	/**\r
	89	Convert the Current Program Status Register (CPSR) to a string. The string is \r
	90	a defacto standard in the ARM world. \r
	91	\r
	92	It is possible to add extra bits by adding them to CpsrChar array.\r
	93	\r
	94	@param Cpsr ARM CPSR register value\r
	95	@param ReturnStr 32 byte string that contains string version of CPSR\r
	96	\r
	97	**/\r
	98	VOID\r
	99	CpsrString (\r
	100	IN UINT32 Cpsr,\r
	101	OUT CHAR8 *ReturnStr\r
	102	)\r
	103	{\r
11c20f4e	104	UINTN Index;\r
	105	CHAR8* Str;\r
	106	CHAR8* ModeStr;\r
6f72e28d	107	CPSR_CHAR CpsrChar[] = {\r
	108	{ 31, 'n' },\r
	109	{ 30, 'z' },\r
	110	{ 29, 'c' },\r
	111	{ 28, 'v' },\r
	112	\r
	113	{ 9, 'e' },\r
	114	{ 8, 'a' },\r
	115	{ 7, 'i' },\r
	116	{ 6, 'f' },\r
	117	{ 5, 't' },\r
	118	{ 0, '?' }\r
	119	};\r
	120	\r
11c20f4e	121	Str = ReturnStr;\r
11c20f4e	122	\r
6f72e28d	123	for (Index = 0; CpsrChar[Index].BIT != 0; Index++, Str++) {\r
	124	*Str = CpsrChar[Index].Char;\r
	125	if ((Cpsr & (1 << CpsrChar[Index].BIT)) != 0) {\r
	126	// Concert to upper case if bit is set\r
	127	*Str &= ~0x20;\r
	128	}\r
	129	}\r
	130	\r
	131	*Str++ = '_';\r
	132	*Str = '\0';\r
	133	\r
	134	switch (Cpsr & 0x1f) {\r
	135	case 0x10:\r
	136	ModeStr = "usr";\r
	137	break;\r
	138	case 0x011:\r
	139	ModeStr = "fiq";\r
	140	break;\r
	141	case 0x12:\r
	142	ModeStr = "irq";\r
	143	break;\r
	144	case 0x13:\r
	145	ModeStr = "svc";\r
	146	break;\r
	147	case 0x16:\r
	148	ModeStr = "mon";\r
	149	break;\r
	150	case 0x17:\r
	151	ModeStr = "abt";\r
	152	break;\r
	153	case 0x1b:\r
	154	ModeStr = "und";\r
	155	break;\r
	156	case 0x1f:\r
	157	ModeStr = "sys";\r
	158	break;\r
	159	\r
	160	default:\r
	161	ModeStr = "???";\r
	162	break;\r
	163	}\r
	164	\r
	165	AsciiStrCat (Str, ModeStr);\r
	166	return;\r
	167	} \r
d5b0f232	168	\r
	169	CHAR8 *\r
	170	FaultStatusToString (\r
	171	IN UINT32 Status\r
	172	)\r
	173	{\r
	174	CHAR8 *FaultSource;\r
	175	\r
	176	switch (Status) {\r
	177	case 0x01: FaultSource = "Alignment fault"; break;\r
	178	case 0x02: FaultSource = "Debug event fault"; break;\r
	179	case 0x03: FaultSource = "Access Flag fault on Section"; break;\r
	180	case 0x04: FaultSource = "Cache maintenance operation fault[2]"; break;\r
	181	case 0x05: FaultSource = "Translation fault on Section"; break;\r
	182	case 0x06: FaultSource = "Access Flag fault on Page"; break;\r
	183	case 0x07: FaultSource = "Translation fault on Page"; break;\r
	184	case 0x08: FaultSource = "Precise External Abort"; break;\r
	185	case 0x09: FaultSource = "Domain fault on Section"; break;\r
	186	case 0x0b: FaultSource = "Domain fault on Page"; break;\r
	187	case 0x0c: FaultSource = "External abort on translation, first level"; break;\r
	188	case 0x0d: FaultSource = "Permission fault on Section"; break;\r
	189	case 0x0e: FaultSource = "External abort on translation, second level"; break;\r
	190	case 0x0f: FaultSource = "Permission fault on Page"; break;\r
	191	case 0x16: FaultSource = "Imprecise External Abort"; break;\r
	192	default: FaultSource = "No function"; break;\r
	193	}\r
	194	\r
	195	return FaultSource;\r
	196	}\r
	197	\r
11c20f4e	198	STATIC CHAR8 *gExceptionTypeString[] = {\r
6f72e28d	199	"Reset",\r
	200	"Undefined OpCode",\r
	201	"SWI",\r
	202	"Prefetch Abort",\r
	203	"Data Abort",\r
	204	"Undefined",\r
	205	"IRQ",\r
	206	"FIQ"\r
	207	};\r
	208	\r
6f72e28d	209	/**\r
	210	This is the default action to take on an unexpected exception\r
	211	\r
	212	Since this is exception context don't do anything crazy like try to allcoate memory.\r
	213	\r
	214	@param ExceptionType Type of the exception\r
	215	@param SystemContext Register state at the time of the Exception\r
	216	\r
	217	\r
	218	**/\r
	219	VOID\r
	220	DefaultExceptionHandler (\r
	221	IN EFI_EXCEPTION_TYPE ExceptionType,\r
	222	IN OUT EFI_SYSTEM_CONTEXT SystemContext\r
	223	)\r
	224	{\r
7755dfd3	225	CHAR8 Buffer[100];\r
7755dfd3	226	UINTN CharCount;\r
d5b0f232	227	UINT32 DfsrStatus;\r
65e27445	228	UINT32 IfsrStatus;\r
d5b0f232	229	BOOLEAN DfsrWrite;\r
d629c283	230	UINT32 PcAdjust = 0;\r
6f72e28d	231	\r
7755dfd3	232	CharCount = AsciiSPrint (Buffer,sizeof (Buffer),"\n%a Exception PC at 0x%08x CPSR 0x%08x ",\r
	233	gExceptionTypeString[ExceptionType], SystemContext.SystemContextArm->PC, SystemContext.SystemContextArm->CPSR);\r
	234	SerialPortWrite ((UINT8 *) Buffer, CharCount);\r
	235	\r
6f72e28d	236	DEBUG_CODE_BEGIN ();\r
	237	CHAR8 *Pdb;\r
	238	UINT32 ImageBase;\r
	239	UINT32 PeCoffSizeOfHeader;\r
	240	UINT32 Offset;\r
	241	CHAR8 CpsrStr[32]; // char per bit. Lower 5-bits are mode that is a 3 char string\r
	242	CHAR8 Buffer[80];\r
097bd461	243	UINT8 *DisAsm;\r
f3198cba	244	UINT32 ItBlock;\r
6f72e28d	245	\r
	246	CpsrString (SystemContext.SystemContextArm->CPSR, CpsrStr);\r
	247	DEBUG ((EFI_D_ERROR, "%a\n", CpsrStr));\r
	248	\r
	249	Pdb = GetImageName (SystemContext.SystemContextArm->PC, &ImageBase, &PeCoffSizeOfHeader);\r
	250	Offset = SystemContext.SystemContextArm->PC - ImageBase;\r
	251	if (Pdb != NULL) {\r
	252	DEBUG ((EFI_D_ERROR, "%a\n", Pdb));\r
	253	\r
	254	//\r
	255	// A PE/COFF image loads its headers into memory so the headers are \r
11c20f4e	256	// included in the linked addresses. ELF and Mach-O images do not\r
6f72e28d	257	// include the headers so the first byte of the image is usually\r
6f72e28d	258	// text (code). If you look at link maps from ELF or Mach-O images\r
11c20f4e	259	// you need to subtract out the size of the PE/COFF header to get\r
6f72e28d	260	// get the offset that matches the link map. \r
	261	//\r
	262	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
	263	\r
	264	// If we come from an image it is safe to show the instruction. We know it should not fault\r
097bd461	265	DisAsm = (UINT8 *)(UINTN)SystemContext.SystemContextArm->PC;\r
f3198cba	266	ItBlock = 0;\r
f3198cba	267	DisassembleInstruction (&DisAsm, (SystemContext.SystemContextArm->CPSR & BIT5) == BIT5, TRUE, &ItBlock, Buffer, sizeof (Buffer));\r
097bd461	268	DEBUG ((EFI_D_ERROR, "\n%a", Buffer));\r
d629c283	269	\r
	270	switch (ExceptionType) {\r
	271	case EXCEPT_ARM_UNDEFINED_INSTRUCTION:\r
	272	case EXCEPT_ARM_SOFTWARE_INTERRUPT:\r
	273	case EXCEPT_ARM_PREFETCH_ABORT:\r
	274	case EXCEPT_ARM_DATA_ABORT:\r
	275	// advance PC past the faulting instruction\r
	276	PcAdjust = (UINTN)DisAsm - SystemContext.SystemContextArm->PC;\r
	277	break;\r
	278	\r
	279	default:\r
	280	break;\r
	281	}\r
097bd461	282	\r
6f72e28d	283	}\r
	284	DEBUG_CODE_END ();\r
	285	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
	286	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
	287	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
	288	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	289	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
	290	\r
	291	// Bit10 is Status[4] Bit3:0 is Status[3:0]\r
	292	DfsrStatus = (SystemContext.SystemContextArm->DFSR & 0xf) \| ((SystemContext.SystemContextArm->DFSR >> 6) & 0x10);\r
	293	DfsrWrite = (SystemContext.SystemContextArm->DFSR & BIT11) != 0;\r
	294	if (DfsrStatus != 0x00) {\r
	295	DEBUG ((EFI_D_ERROR, " %a: %a 0x%08x\n", FaultStatusToString (DfsrStatus), DfsrWrite ? "write to" : "read from", SystemContext.SystemContextArm->DFAR));\r
	296	}\r
65e27445	297	\r
	298	IfsrStatus = (SystemContext.SystemContextArm->IFSR & 0xf) \| ((SystemContext.SystemContextArm->IFSR >> 6) & 0x10);\r
	299	if (IfsrStatus != 0) {\r
	300	DEBUG ((EFI_D_ERROR, " Instruction %a at 0x%08x\n", FaultStatusToString (SystemContext.SystemContextArm->IFSR & 0xf), SystemContext.SystemContextArm->IFAR));\r
d5b0f232	301	}\r
6f72e28d	302	\r
d5b0f232	303	DEBUG ((EFI_D_ERROR, "\n"));\r
6f72e28d	304	ASSERT (FALSE);\r
d629c283	305	\r
bb02cb80	306	// Clear the error registers that we have already displayed incase some one wants to keep going\r
	307	SystemContext.SystemContextArm->DFSR = 0;\r
	308	SystemContext.SystemContextArm->IFSR = 0;\r
	309	\r
d629c283	310	// If some one is stepping past the exception handler adjust the PC to point to the next instruction \r
d629c283	311	SystemContext.SystemContextArm->PC += PcAdjust;\r
6f72e28d	312	}\r
	313	\r
	314	\r
	315	\r
	316	\r
	317	/**\r
	318	The constructor function caches EFI Debug table information for use in the exception handler.\r
	319	\r
	320	\r
	321	@param ImageHandle The firmware allocated handle for the EFI image.\r
	322	@param SystemTable A pointer to the EFI System Table.\r
	323	\r
	324	@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.\r
	325	\r
	326	**/\r
	327	EFI_STATUS\r
	328	EFIAPI\r
	329	DefaultExceptionHandlerConstructor (\r
	330	IN EFI_HANDLE ImageHandle,\r
	331	IN EFI_SYSTEM_TABLE *SystemTable\r
	332	)\r
	333	{\r
	334	EFI_STATUS Status;\r
	335	\r
	336	\r
	337	Status = EfiGetSystemConfigurationTable (&gEfiDebugImageInfoTableGuid, (VOID **)&gDebugImageTableHeader);\r
	338	if (EFI_ERROR (Status)) {\r
	339	gDebugImageTableHeader = NULL;\r
	340	}\r
	341	return Status;\r
	342	}\r