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

/** @file\r
  Default exception handler\r
\r
  Copyright (c) 2008-2010, Apple Inc. All rights reserved.\r
  \r
  All rights reserved. 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
 \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
  \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 = ReturnStr;\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
  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
\r
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
/**\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
  DEBUG ((EFI_D_ERROR, "\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 addressess. 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 subtact 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
	4	Copyright (c) 2008-2010, Apple Inc. All rights reserved.\r
	5	\r
	6	All rights reserved. This program and the accompanying materials\r
	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
	36	\r
	37	\r
	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
	64	\r
	65	DebugTable = gDebugImageTableHeader->EfiDebugImageInfoTable;\r
	66	if (DebugTable == NULL) {\r
	67	return NULL;\r
	68	}\r
	69	\r
	70	Address = (CHAR8 *)(UINTN)FaultAddress;\r
	71	for (Entry = 0; Entry < gDebugImageTableHeader->TableSize; Entry++, DebugTable++) {\r
	72	if (DebugTable->NormalImage != NULL) {\r
	73	if ((DebugTable->NormalImage->ImageInfoType == EFI_DEBUG_IMAGE_INFO_TYPE_NORMAL) && \r
	74	(DebugTable->NormalImage->LoadedImageProtocolInstance != NULL)) {\r
	75	if ((Address >= (CHAR8 *)DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase) &&\r
	76	(Address <= ((CHAR8 *)DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase + DebugTable->NormalImage->LoadedImageProtocolInstance->ImageSize))) {\r
	77	*ImageBase = (UINT32)DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase;\r
	78	PeCoffSizeOfHeaders = PeCoffGetSizeOfHeaders ((VOID )(UINTN)*ImageBase);\r
	79	return PeCoffLoaderGetPdbPointer (DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase);\r
	80	} \r
	81	}\r
	82	} \r
	83	}\r
	84	\r
	85	return NULL;\r
	86	}\r
	87	\r
	88	\r
	89	/**\r
	90	Convert the Current Program Status Register (CPSR) to a string. The string is \r
	91	a defacto standard in the ARM world. \r
92	\r
93	It is possible to add extra bits by adding them to CpsrChar array.\r
94	\r
95	@param Cpsr ARM CPSR register value\r
96	@param ReturnStr 32 byte string that contains string version of CPSR\r
97	\r
98	**/\r
99	VOID\r
100	CpsrString (\r
101	IN UINT32 Cpsr,\r
102	OUT CHAR8 *ReturnStr\r
103	)\r
104	{\r
105	UINTN Index;\r
106	CHAR8 *Str = ReturnStr;\r
107	CHAR8 *ModeStr;\r
108	CPSR_CHAR CpsrChar[] = {\r
109	{ 31, 'n' },\r
110	{ 30, 'z' },\r
111	{ 29, 'c' },\r
112	{ 28, 'v' },\r
113	\r
114	{ 9, 'e' },\r
115	{ 8, 'a' },\r
116	{ 7, 'i' },\r
117	{ 6, 'f' },\r
118	{ 5, 't' },\r
119	{ 0, '?' }\r
120	};\r
121	\r
122	for (Index = 0; CpsrChar[Index].BIT != 0; Index++, Str++) {\r
123	*Str = CpsrChar[Index].Char;\r
124	if ((Cpsr & (1 << CpsrChar[Index].BIT)) != 0) {\r
125	// Concert to upper case if bit is set\r
126	*Str &= ~0x20;\r
127	}\r
128	}\r
129	\r
130	*Str++ = '_';\r
131	*Str = '\0';\r
132	\r
133	switch (Cpsr & 0x1f) {\r
134	case 0x10:\r
135	ModeStr = "usr";\r
136	break;\r
137	case 0x011:\r
138	ModeStr = "fiq";\r
139	break;\r
140	case 0x12:\r
141	ModeStr = "irq";\r
142	break;\r
143	case 0x13:\r
144	ModeStr = "svc";\r
145	break;\r
146	case 0x16:\r
147	ModeStr = "mon";\r
148	break;\r
149	case 0x17:\r
150	ModeStr = "abt";\r
151	break;\r
152	case 0x1b:\r
153	ModeStr = "und";\r
154	break;\r
155	case 0x1f:\r
156	ModeStr = "sys";\r
157	break;\r
158	\r
159	default:\r
160	ModeStr = "???";\r
161	break;\r
162	}\r
163	\r
164	AsciiStrCat (Str, ModeStr);\r
165	return;\r
166	} \r
d5b0f232	167	\r
	168	CHAR8 *\r
	169	FaultStatusToString (\r
	170	IN UINT32 Status\r
	171	)\r
	172	{\r
	173	CHAR8 *FaultSource;\r
	174	\r
	175	switch (Status) {\r
	176	case 0x01: FaultSource = "Alignment fault"; break;\r
	177	case 0x02: FaultSource = "Debug event fault"; break;\r
	178	case 0x03: FaultSource = "Access Flag fault on Section"; break;\r
	179	case 0x04: FaultSource = "Cache maintenance operation fault[2]"; break;\r
	180	case 0x05: FaultSource = "Translation fault on Section"; break;\r
	181	case 0x06: FaultSource = "Access Flag fault on Page"; break;\r
	182	case 0x07: FaultSource = "Translation fault on Page"; break;\r
	183	case 0x08: FaultSource = "Precise External Abort"; break;\r
	184	case 0x09: FaultSource = "Domain fault on Section"; break;\r
	185	case 0x0b: FaultSource = "Domain fault on Page"; break;\r
	186	case 0x0c: FaultSource = "External abort on translation, first level"; break;\r
	187	case 0x0d: FaultSource = "Permission fault on Section"; break;\r
	188	case 0x0e: FaultSource = "External abort on translation, second level"; break;\r
	189	case 0x0f: FaultSource = "Permission fault on Page"; break;\r
	190	case 0x16: FaultSource = "Imprecise External Abort"; break;\r
	191	default: FaultSource = "No function"; break;\r
	192	}\r
	193	\r
	194	return FaultSource;\r
	195	}\r
	196	\r
	197	\r
6f72e28d	198	CHAR8 *gExceptionTypeString[] = {\r
	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
	209	\r
	210	/**\r
	211	This is the default action to take on an unexpected exception\r
	212	\r
	213	Since this is exception context don't do anything crazy like try to allcoate memory.\r
	214	\r
	215	@param ExceptionType Type of the exception\r
	216	@param SystemContext Register state at the time of the Exception\r
	217	\r
	218	\r
	219	**/\r
	220	VOID\r
	221	DefaultExceptionHandler (\r
	222	IN EFI_EXCEPTION_TYPE ExceptionType,\r
	223	IN OUT EFI_SYSTEM_CONTEXT SystemContext\r
	224	)\r
	225	{\r
d5b0f232	226	UINT32 DfsrStatus;\r
65e27445	227	UINT32 IfsrStatus;\r
d5b0f232	228	BOOLEAN DfsrWrite;\r
d629c283	229	UINT32 PcAdjust = 0;\r
6f72e28d	230	\r
	231	DEBUG ((EFI_D_ERROR, "\n%a Exception PC at 0x%08x CPSR 0x%08x ", gExceptionTypeString[ExceptionType], SystemContext.SystemContextArm->PC, SystemContext.SystemContextArm->CPSR));\r
	232	DEBUG_CODE_BEGIN ();\r
	233	CHAR8 *Pdb;\r
	234	UINT32 ImageBase;\r
	235	UINT32 PeCoffSizeOfHeader;\r
	236	UINT32 Offset;\r
	237	CHAR8 CpsrStr[32]; // char per bit. Lower 5-bits are mode that is a 3 char string\r
	238	CHAR8 Buffer[80];\r
097bd461	239	UINT8 *DisAsm;\r
f3198cba	240	UINT32 ItBlock;\r
6f72e28d	241	\r
	242	CpsrString (SystemContext.SystemContextArm->CPSR, CpsrStr);\r
	243	DEBUG ((EFI_D_ERROR, "%a\n", CpsrStr));\r
	244	\r
	245	Pdb = GetImageName (SystemContext.SystemContextArm->PC, &ImageBase, &PeCoffSizeOfHeader);\r
	246	Offset = SystemContext.SystemContextArm->PC - ImageBase;\r
	247	if (Pdb != NULL) {\r
	248	DEBUG ((EFI_D_ERROR, "%a\n", Pdb));\r
	249	\r
	250	//\r
	251	// A PE/COFF image loads its headers into memory so the headers are \r
	252	// included in the linked addressess. ELF and Mach-O images do not\r
	253	// include the headers so the first byte of the image is usually\r
	254	// text (code). If you look at link maps from ELF or Mach-O images\r
	255	// you need to subtact out the size of the PE/COFF header to get\r
	256	// get the offset that matches the link map. \r
	257	//\r
	258	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
	259	\r
	260	// If we come from an image it is safe to show the instruction. We know it should not fault\r
097bd461	261	DisAsm = (UINT8 *)(UINTN)SystemContext.SystemContextArm->PC;\r
f3198cba	262	ItBlock = 0;\r
f3198cba	263	DisassembleInstruction (&DisAsm, (SystemContext.SystemContextArm->CPSR & BIT5) == BIT5, TRUE, &ItBlock, Buffer, sizeof (Buffer));\r
097bd461	264	DEBUG ((EFI_D_ERROR, "\n%a", Buffer));\r
d629c283	265	\r
	266	switch (ExceptionType) {\r
	267	case EXCEPT_ARM_UNDEFINED_INSTRUCTION:\r
	268	case EXCEPT_ARM_SOFTWARE_INTERRUPT:\r
	269	case EXCEPT_ARM_PREFETCH_ABORT:\r
	270	case EXCEPT_ARM_DATA_ABORT:\r
	271	// advance PC past the faulting instruction\r
	272	PcAdjust = (UINTN)DisAsm - SystemContext.SystemContextArm->PC;\r
	273	break;\r
	274	\r
	275	default:\r
	276	break;\r
	277	}\r
097bd461	278	\r
6f72e28d	279	}\r
	280	DEBUG_CODE_END ();\r
	281	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
	282	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
	283	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
	284	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	285	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
	286	\r
	287	// Bit10 is Status[4] Bit3:0 is Status[3:0]\r
	288	DfsrStatus = (SystemContext.SystemContextArm->DFSR & 0xf) \| ((SystemContext.SystemContextArm->DFSR >> 6) & 0x10);\r
	289	DfsrWrite = (SystemContext.SystemContextArm->DFSR & BIT11) != 0;\r
	290	if (DfsrStatus != 0x00) {\r
	291	DEBUG ((EFI_D_ERROR, " %a: %a 0x%08x\n", FaultStatusToString (DfsrStatus), DfsrWrite ? "write to" : "read from", SystemContext.SystemContextArm->DFAR));\r
	292	}\r
65e27445	293	\r
	294	IfsrStatus = (SystemContext.SystemContextArm->IFSR & 0xf) \| ((SystemContext.SystemContextArm->IFSR >> 6) & 0x10);\r
	295	if (IfsrStatus != 0) {\r
	296	DEBUG ((EFI_D_ERROR, " Instruction %a at 0x%08x\n", FaultStatusToString (SystemContext.SystemContextArm->IFSR & 0xf), SystemContext.SystemContextArm->IFAR));\r
d5b0f232	297	}\r
6f72e28d	298	\r
d5b0f232	299	DEBUG ((EFI_D_ERROR, "\n"));\r
6f72e28d	300	ASSERT (FALSE);\r
d629c283	301	\r
bb02cb80	302	// Clear the error registers that we have already displayed incase some one wants to keep going\r
	303	SystemContext.SystemContextArm->DFSR = 0;\r
	304	SystemContext.SystemContextArm->IFSR = 0;\r
	305	\r
d629c283	306	// If some one is stepping past the exception handler adjust the PC to point to the next instruction \r
d629c283	307	SystemContext.SystemContextArm->PC += PcAdjust;\r
6f72e28d	308	}\r
	309	\r
	310	\r
	311	\r
	312	\r
	313	/**\r
	314	The constructor function caches EFI Debug table information for use in the exception handler.\r
	315	\r
	316	\r
	317	@param ImageHandle The firmware allocated handle for the EFI image.\r
	318	@param SystemTable A pointer to the EFI System Table.\r
	319	\r
	320	@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.\r
	321	\r
	322	**/\r
	323	EFI_STATUS\r
	324	EFIAPI\r
	325	DefaultExceptionHandlerConstructor (\r
	326	IN EFI_HANDLE ImageHandle,\r
	327	IN EFI_SYSTEM_TABLE *SystemTable\r
	328	)\r
	329	{\r
	330	EFI_STATUS Status;\r
	331	\r
	332	\r
	333	Status = EfiGetSystemConfigurationTable (&gEfiDebugImageInfoTableGuid, (VOID **)&gDebugImageTableHeader);\r
	334	if (EFI_ERROR (Status)) {\r
	335	gDebugImageTableHeader = NULL;\r
	336	}\r
	337	return Status;\r
	338	}\r