[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
\r
#include <Guid/DebugImageInfoTable.h>\r
#include <Protocol/DebugSupport.h>\r
#include <Protocol/LoadedImage.h>\r
\r
\r
VOID\r
DisassembleArmInstruction (\r
  IN  UINT32    *OpCodePtr,\r
  OUT CHAR8     *Buf,\r
  OUT UINTN     Size\r
  );\r
\r
VOID\r
DisassembleThumbInstruction (\r
  IN  UINT16    *OpCodePtr,\r
  OUT CHAR8     *Buf,\r
  OUT UINTN     Size\r
  );\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 *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
\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
    \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
      if ((SystemContext.SystemContextArm->CPSR & 0x20) == 0) {\r
        // ARM\r
        DisassembleArmInstruction ((UINT32 *)(UINTN)SystemContext.SystemContextArm->PC, Buffer, sizeof (Buffer));\r
        DEBUG ((EFI_D_ERROR, "\n%a", Buffer));\r
      } else {\r
        // Thumb\r
        DEBUG ((EFI_D_ERROR, "\nFaulting Instruction 0x%04x", (UINT16 *)(UINTN)SystemContext.SystemContextArm->PC));\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\n", SystemContext.SystemContextArm->DFSR, SystemContext.SystemContextArm->DFAR, SystemContext.SystemContextArm->IFSR, SystemContext.SystemContextArm->IFAR));\r
\r
  ASSERT (FALSE);\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
	21	\r
	22	#include <Guid/DebugImageInfoTable.h>\r
	23	#include <Protocol/DebugSupport.h>\r
	24	#include <Protocol/LoadedImage.h>\r
	25	\r
	26	\r
	27	VOID\r
	28	DisassembleArmInstruction (\r
	29	IN UINT32 *OpCodePtr,\r
	30	OUT CHAR8 *Buf,\r
	31	OUT UINTN Size\r
	32	);\r
	33	\r
	34	VOID\r
	35	DisassembleThumbInstruction (\r
	36	IN UINT16 *OpCodePtr,\r
	37	OUT CHAR8 *Buf,\r
	38	OUT UINTN Size\r
	39	);\r
	40	\r
	41	\r
	42	EFI_DEBUG_IMAGE_INFO_TABLE_HEADER *gDebugImageTableHeader = NULL;\r
	43	\r
	44	\r
	45	typedef struct {\r
	46	UINT32 BIT;\r
	47	CHAR8 Char;\r
	48	} CPSR_CHAR;\r
	49	\r
	50	\r
	51	\r
	52	\r
	53	/**\r
	54	Use the EFI Debug Image Table to lookup the FaultAddress and find which PE/COFF image \r
	55	it came from. As long as the PE/COFF image contains a debug directory entry a \r
	56	string can be returned. For ELF and Mach-O images the string points to the Mach-O or ELF\r
	57	image. Microsoft tools contain a pointer to the PDB file that contains the debug information.\r
	58	\r
	59	@param FaultAddress Address to find PE/COFF image for. \r
	60	@param ImageBase Return load address of found image\r
	61	@param PeCoffSizeOfHeaders Return the size of the PE/COFF header for the image that was found\r
	62	\r
	63	@retval NULL FaultAddress not in a loaded PE/COFF image.\r
	64	@retval Path and file name of PE/COFF image.\r
65	\r
66	**/\r
67	CHAR8 *\r
68	GetImageName (\r
69	IN UINT32 FaultAddress,\r
70	OUT UINT32 *ImageBase,\r
71	OUT UINT32 *PeCoffSizeOfHeaders\r
72	)\r
73	{\r
74	EFI_DEBUG_IMAGE_INFO *DebugTable;\r
75	UINTN Entry;\r
76	CHAR8 *Address;\r
77	\r
78	\r
79	DebugTable = gDebugImageTableHeader->EfiDebugImageInfoTable;\r
80	if (DebugTable == NULL) {\r
81	return NULL;\r
82	}\r
83	\r
84	Address = (CHAR8 *)(UINTN)FaultAddress;\r
85	for (Entry = 0; Entry < gDebugImageTableHeader->TableSize; Entry++, DebugTable++) {\r
86	if (DebugTable->NormalImage != NULL) {\r
87	if ((DebugTable->NormalImage->ImageInfoType == EFI_DEBUG_IMAGE_INFO_TYPE_NORMAL) && \r
88	(DebugTable->NormalImage->LoadedImageProtocolInstance != NULL)) {\r
89	if ((Address >= (CHAR8 *)DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase) &&\r
90	(Address <= ((CHAR8 *)DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase + DebugTable->NormalImage->LoadedImageProtocolInstance->ImageSize))) {\r
91	*ImageBase = (UINT32)DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase;\r
92	PeCoffSizeOfHeaders = PeCoffGetSizeOfHeaders ((VOID )(UINTN)*ImageBase);\r
93	return PeCoffLoaderGetPdbPointer (DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase);\r
94	} \r
95	}\r
96	} \r
97	}\r
98	\r
99	return NULL;\r
100	}\r
101	\r
102	\r
103	/**\r
104	Convert the Current Program Status Register (CPSR) to a string. The string is \r
105	a defacto standard in the ARM world. \r
106	\r
107	It is possible to add extra bits by adding them to CpsrChar array.\r
108	\r
109	@param Cpsr ARM CPSR register value\r
110	@param ReturnStr 32 byte string that contains string version of CPSR\r
111	\r
112	**/\r
113	VOID\r
114	CpsrString (\r
115	IN UINT32 Cpsr,\r
116	OUT CHAR8 *ReturnStr\r
117	)\r
118	{\r
119	UINTN Index;\r
120	CHAR8 *Str = ReturnStr;\r
121	CHAR8 *ModeStr;\r
122	CPSR_CHAR CpsrChar[] = {\r
123	{ 31, 'n' },\r
124	{ 30, 'z' },\r
125	{ 29, 'c' },\r
126	{ 28, 'v' },\r
127	\r
128	{ 9, 'e' },\r
129	{ 8, 'a' },\r
130	{ 7, 'i' },\r
131	{ 6, 'f' },\r
132	{ 5, 't' },\r
133	{ 0, '?' }\r
134	};\r
135	\r
136	for (Index = 0; CpsrChar[Index].BIT != 0; Index++, Str++) {\r
137	*Str = CpsrChar[Index].Char;\r
138	if ((Cpsr & (1 << CpsrChar[Index].BIT)) != 0) {\r
139	// Concert to upper case if bit is set\r
140	*Str &= ~0x20;\r
141	}\r
142	}\r
143	\r
144	*Str++ = '_';\r
145	*Str = '\0';\r
146	\r
147	switch (Cpsr & 0x1f) {\r
148	case 0x10:\r
149	ModeStr = "usr";\r
150	break;\r
151	case 0x011:\r
152	ModeStr = "fiq";\r
153	break;\r
154	case 0x12:\r
155	ModeStr = "irq";\r
156	break;\r
157	case 0x13:\r
158	ModeStr = "svc";\r
159	break;\r
160	case 0x16:\r
161	ModeStr = "mon";\r
162	break;\r
163	case 0x17:\r
164	ModeStr = "abt";\r
165	break;\r
166	case 0x1b:\r
167	ModeStr = "und";\r
168	break;\r
169	case 0x1f:\r
170	ModeStr = "sys";\r
171	break;\r
172	\r
173	default:\r
174	ModeStr = "???";\r
175	break;\r
176	}\r
177	\r
178	AsciiStrCat (Str, ModeStr);\r
179	return;\r
180	} \r
181	\r
182	CHAR8 *gExceptionTypeString[] = {\r
183	"Reset",\r
184	"Undefined OpCode",\r
185	"SWI",\r
186	"Prefetch Abort",\r
187	"Data Abort",\r
188	"Undefined",\r
189	"IRQ",\r
190	"FIQ"\r
191	};\r
192	\r
193	\r
194	/**\r
195	This is the default action to take on an unexpected exception\r
196	\r
197	Since this is exception context don't do anything crazy like try to allcoate memory.\r
198	\r
199	@param ExceptionType Type of the exception\r
200	@param SystemContext Register state at the time of the Exception\r
201	\r
202	\r
203	**/\r
204	VOID\r
205	DefaultExceptionHandler (\r
206	IN EFI_EXCEPTION_TYPE ExceptionType,\r
207	IN OUT EFI_SYSTEM_CONTEXT SystemContext\r
208	)\r
209	{\r
210	\r
211	DEBUG ((EFI_D_ERROR, "\n%a Exception PC at 0x%08x CPSR 0x%08x ", gExceptionTypeString[ExceptionType], SystemContext.SystemContextArm->PC, SystemContext.SystemContextArm->CPSR));\r
212	DEBUG_CODE_BEGIN ();\r
213	CHAR8 *Pdb;\r
214	UINT32 ImageBase;\r
215	UINT32 PeCoffSizeOfHeader;\r
216	UINT32 Offset;\r
217	CHAR8 CpsrStr[32]; // char per bit. Lower 5-bits are mode that is a 3 char string\r
218	CHAR8 Buffer[80];\r
219	\r
220	CpsrString (SystemContext.SystemContextArm->CPSR, CpsrStr);\r
221	DEBUG ((EFI_D_ERROR, "%a\n", CpsrStr));\r
222	\r
223	Pdb = GetImageName (SystemContext.SystemContextArm->PC, &ImageBase, &PeCoffSizeOfHeader);\r
224	Offset = SystemContext.SystemContextArm->PC - ImageBase;\r
225	if (Pdb != NULL) {\r
226	DEBUG ((EFI_D_ERROR, "%a\n", Pdb));\r
227	\r
228	//\r
229	// A PE/COFF image loads its headers into memory so the headers are \r
230	// included in the linked addressess. ELF and Mach-O images do not\r
231	// include the headers so the first byte of the image is usually\r
232	// text (code). If you look at link maps from ELF or Mach-O images\r
233	// you need to subtact out the size of the PE/COFF header to get\r
234	// get the offset that matches the link map. \r
235	//\r
236	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
237	\r
238	// If we come from an image it is safe to show the instruction. We know it should not fault\r
239	if ((SystemContext.SystemContextArm->CPSR & 0x20) == 0) {\r
240	// ARM\r
241	DisassembleArmInstruction ((UINT32 *)(UINTN)SystemContext.SystemContextArm->PC, Buffer, sizeof (Buffer));\r
242	DEBUG ((EFI_D_ERROR, "\n%a", Buffer));\r
243	} else {\r
244	// Thumb\r
245	DEBUG ((EFI_D_ERROR, "\nFaulting Instruction 0x%04x", (UINT16 *)(UINTN)SystemContext.SystemContextArm->PC));\r
246	}\r
247	}\r
248	DEBUG_CODE_END ();\r
249	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
250	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
251	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
252	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
253	DEBUG ((EFI_D_ERROR, "DFSR 0x%08x DFAR 0x%08x IFSR 0x%08x IFAR 0x%08x\n\n", SystemContext.SystemContextArm->DFSR, SystemContext.SystemContextArm->DFAR, SystemContext.SystemContextArm->IFSR, SystemContext.SystemContextArm->IFAR));\r
254	\r
255	ASSERT (FALSE);\r
256	}\r
257	\r
258	\r
259	\r
260	\r
261	/**\r
262	The constructor function caches EFI Debug table information for use in the exception handler.\r
263	\r
264	\r
265	@param ImageHandle The firmware allocated handle for the EFI image.\r
266	@param SystemTable A pointer to the EFI System Table.\r
267	\r
268	@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.\r
269	\r
270	**/\r
271	EFI_STATUS\r
272	EFIAPI\r
273	DefaultExceptionHandlerConstructor (\r
274	IN EFI_HANDLE ImageHandle,\r
275	IN EFI_SYSTEM_TABLE *SystemTable\r
276	)\r
277	{\r
278	EFI_STATUS Status;\r
279	\r
280	\r
281	Status = EfiGetSystemConfigurationTable (&gEfiDebugImageInfoTableGuid, (VOID **)&gDebugImageTableHeader);\r
282	if (EFI_ERROR (Status)) {\r
283	gDebugImageTableHeader = NULL;\r
284	}\r
285	return Status;\r
286	}\r