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

/** @file\r
  Default exception handler\r
\r
  Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>\r
  Copyright (c) 2012, ARM Ltd. All rights reserved.<BR>\r
\r
  This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include <Uefi.h>\r
#include <Library/BaseLib.h>\r
#include <Library/DebugLib.h>\r
#include <Library/PeCoffGetEntryPointLib.h>\r
#include <Library/PrintLib.h>\r
#include <Library/ArmDisassemblerLib.h>\r
#include <Library/SerialPortLib.h>\r
#include <Library/UefiBootServicesTableLib.h>\r
#include <Library/UefiLib.h>\r
\r
#include <Guid/DebugImageInfoTable.h>\r
\r
#include <Protocol/DebugSupport.h>\r
#include <Library/DefaultExceptionHandlerLib.h>\r
\r
//\r
// The number of elements in a CHAR8 array, including the terminating NUL, that\r
// is meant to hold the string rendering of the CPSR.\r
//\r
#define CPSR_STRING_SIZE 32\r
\r
typedef struct {\r
  UINT32  BIT;\r
  CHAR8   Char;\r
} CPSR_CHAR;\r
\r
CHAR8 *\r
GetImageName (\r
  IN  UINTN  FaultAddress,\r
  OUT UINTN  *ImageBase,\r
  OUT UINTN  *PeCoffSizeOfHeaders\r
  );\r
\r
/**\r
  Convert the Current Program Status Register (CPSR) to a string. The string is\r
  a defacto standard in the ARM world.\r
\r
  It is possible to add extra bits by adding them to CpsrChar array.\r
\r
  @param  Cpsr         ARM CPSR register value\r
  @param  ReturnStr    CPSR_STRING_SIZE byte string that contains string\r
                       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
  //\r
  // See the interface contract in the leading comment block.\r
  //\r
  AsciiStrCatS (Str, CPSR_STRING_SIZE - (Str - ReturnStr), ModeStr);\r
}\r
\r
CHAR8 *\r
FaultStatusToString (\r
  IN  UINT32  Status\r
  )\r
{\r
  CHAR8 *FaultSource;\r
\r
  switch (Status) {\r
    case 0x01: FaultSource = "Alignment fault"; break;\r
    case 0x02: FaultSource = "Debug event fault"; break;\r
    case 0x03: FaultSource = "Access Flag fault on Section"; break;\r
    case 0x04: FaultSource = "Cache maintenance operation fault[2]"; break;\r
    case 0x05: FaultSource = "Translation fault on Section"; break;\r
    case 0x06: FaultSource = "Access Flag fault on Page"; break;\r
    case 0x07: FaultSource = "Translation fault on Page"; break;\r
    case 0x08: FaultSource = "Precise External Abort"; break;\r
    case 0x09: FaultSource = "Domain fault on Section"; break;\r
    case 0x0b: FaultSource = "Domain fault on Page"; break;\r
    case 0x0c: FaultSource = "External abort on translation, first level"; break;\r
    case 0x0d: FaultSource = "Permission fault on Section"; break;\r
    case 0x0e: FaultSource = "External abort on translation, second level"; break;\r
    case 0x0f: FaultSource = "Permission fault on Page"; break;\r
    case 0x16: FaultSource = "Imprecise External Abort"; break;\r
    default:   FaultSource = "No function"; break;\r
    }\r
\r
  return FaultSource;\r
}\r
\r
STATIC CHAR8 *gExceptionTypeString[] = {\r
  "Reset",\r
  "Undefined OpCode",\r
  "SVC",\r
  "Prefetch Abort",\r
  "Data Abort",\r
  "Undefined",\r
  "IRQ",\r
  "FIQ"\r
};\r
\r
/**\r
  This is the default action to take on an unexpected exception\r
\r
  Since this is exception context don't do anything crazy like try to allcoate memory.\r
\r
  @param  ExceptionType    Type of the exception\r
  @param  SystemContext    Register state at the time of the Exception\r
\r
\r
**/\r
VOID\r
DefaultExceptionHandler (\r
  IN     EFI_EXCEPTION_TYPE           ExceptionType,\r
  IN OUT EFI_SYSTEM_CONTEXT           SystemContext\r
  )\r
{\r
  CHAR8     Buffer[100];\r
  UINTN     CharCount;\r
  UINT32    DfsrStatus;\r
  UINT32    IfsrStatus;\r
  BOOLEAN   DfsrWrite;\r
  UINT32    PcAdjust = 0;\r
\r
  CharCount = AsciiSPrint (Buffer,sizeof (Buffer),"\n%a Exception PC at 0x%08x  CPSR 0x%08x ",\r
         gExceptionTypeString[ExceptionType], SystemContext.SystemContextArm->PC, SystemContext.SystemContextArm->CPSR);\r
  SerialPortWrite ((UINT8 *)Buffer, CharCount);\r
  if (gST->ConOut != NULL) {\r
    AsciiPrint (Buffer);\r
  }\r
\r
  DEBUG_CODE_BEGIN ();\r
    CHAR8   *Pdb;\r
    UINT32  ImageBase;\r
    UINT32  PeCoffSizeOfHeader;\r
    UINT32  Offset;\r
    CHAR8   CpsrStr[CPSR_STRING_SIZE];  // char per bit. Lower 5-bits are mode\r
                                        // 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
  CpuDeadLoop ();   // may return if executing under a debugger\r
\r
  // Clear the error registers that we have already displayed incase some one wants to keep going\r
  SystemContext.SystemContextArm->DFSR = 0;\r
  SystemContext.SystemContextArm->IFSR = 0;\r
\r
  // If some one is stepping past the exception handler adjust the PC to point to the next instruction\r
  SystemContext.SystemContextArm->PC += PcAdjust;\r
}\r
Commit	Line	Data
6f72e28d	1	/** @file\r
	2	Default exception handler\r
	3	\r
d6ebcab7	4	Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>\r
619b3998	5	Copyright (c) 2012, ARM Ltd. All rights reserved.<BR>\r
3402aac7	6	\r
d6ebcab7	7	This program and the accompanying materials\r
6f72e28d	8	are licensed and made available under the terms and conditions of the BSD License\r
	9	which accompanies this distribution. The full text of the license may be found at\r
	10	http://opensource.org/licenses/bsd-license.php\r
	11	\r
	12	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	13	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	14	\r
	15	**/\r
	16	\r
	17	#include <Uefi.h>\r
6f72e28d	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
31f53880	24	#include <Library/UefiBootServicesTableLib.h>\r
00755e1c	25	#include <Library/UefiLib.h>\r
6f72e28d	26	\r
6f72e28d	27	#include <Guid/DebugImageInfoTable.h>\r
6f72e28d	28	\r
619b3998	29	#include <Protocol/DebugSupport.h>\r
619b3998	30	#include <Library/DefaultExceptionHandlerLib.h>\r
6f72e28d	31	\r
a1848bc0 LE	32	//\r
	33	// The number of elements in a CHAR8 array, including the terminating NUL, that\r
	34	// is meant to hold the string rendering of the CPSR.\r
	35	//\r
	36	#define CPSR_STRING_SIZE 32\r
	37	\r
6f72e28d	38	typedef struct {\r
	39	UINT32 BIT;\r
	40	CHAR8 Char;\r
	41	} CPSR_CHAR;\r
	42	\r
6f72e28d	43	CHAR8 *\r
6f72e28d	44	GetImageName (\r
c63626b7	45	IN UINTN FaultAddress,\r
	46	OUT UINTN *ImageBase,\r
	47	OUT UINTN *PeCoffSizeOfHeaders\r
619b3998	48	);\r
6f72e28d	49	\r
6f72e28d	50	/**\r
3402aac7 RC	51	Convert the Current Program Status Register (CPSR) to a string. The string is\r
	52	a defacto standard in the ARM world.\r
	53	\r
6f72e28d	54	It is possible to add extra bits by adding them to CpsrChar array.\r
	55	\r
	56	@param Cpsr ARM CPSR register value\r
a1848bc0 LE	57	@param ReturnStr CPSR_STRING_SIZE byte string that contains string\r
a1848bc0 LE	58	version of CPSR\r
6f72e28d	59	\r
	60	**/\r
	61	VOID\r
	62	CpsrString (\r
	63	IN UINT32 Cpsr,\r
	64	OUT CHAR8 *ReturnStr\r
	65	)\r
	66	{\r
11c20f4e	67	UINTN Index;\r
	68	CHAR8* Str;\r
	69	CHAR8* ModeStr;\r
6f72e28d	70	CPSR_CHAR CpsrChar[] = {\r
	71	{ 31, 'n' },\r
	72	{ 30, 'z' },\r
	73	{ 29, 'c' },\r
	74	{ 28, 'v' },\r
	75	\r
	76	{ 9, 'e' },\r
	77	{ 8, 'a' },\r
	78	{ 7, 'i' },\r
	79	{ 6, 'f' },\r
	80	{ 5, 't' },\r
	81	{ 0, '?' }\r
	82	};\r
3402aac7	83	\r
11c20f4e	84	Str = ReturnStr;\r
11c20f4e	85	\r
6f72e28d	86	for (Index = 0; CpsrChar[Index].BIT != 0; Index++, Str++) {\r
	87	*Str = CpsrChar[Index].Char;\r
	88	if ((Cpsr & (1 << CpsrChar[Index].BIT)) != 0) {\r
	89	// Concert to upper case if bit is set\r
	90	*Str &= ~0x20;\r
	91	}\r
	92	}\r
3402aac7	93	\r
6f72e28d	94	*Str++ = '_';\r
6f72e28d	95	*Str = '\0';\r
3402aac7	96	\r
6f72e28d	97	switch (Cpsr & 0x1f) {\r
	98	case 0x10:\r
	99	ModeStr = "usr";\r
	100	break;\r
	101	case 0x011:\r
	102	ModeStr = "fiq";\r
	103	break;\r
	104	case 0x12:\r
	105	ModeStr = "irq";\r
	106	break;\r
	107	case 0x13:\r
	108	ModeStr = "svc";\r
	109	break;\r
	110	case 0x16:\r
	111	ModeStr = "mon";\r
	112	break;\r
	113	case 0x17:\r
	114	ModeStr = "abt";\r
	115	break;\r
	116	case 0x1b:\r
	117	ModeStr = "und";\r
	118	break;\r
	119	case 0x1f:\r
	120	ModeStr = "sys";\r
	121	break;\r
3402aac7	122	\r
6f72e28d	123	default:\r
	124	ModeStr = "???";\r
	125	break;\r
	126	}\r
3402aac7	127	\r
a1848bc0 LE	128	//\r
	129	// See the interface contract in the leading comment block.\r
	130	//\r
	131	AsciiStrCatS (Str, CPSR_STRING_SIZE - (Str - ReturnStr), ModeStr);\r
3402aac7	132	}\r
d5b0f232	133	\r
	134	CHAR8 *\r
	135	FaultStatusToString (\r
	136	IN UINT32 Status\r
	137	)\r
	138	{\r
	139	CHAR8 *FaultSource;\r
	140	\r
	141	switch (Status) {\r
	142	case 0x01: FaultSource = "Alignment fault"; break;\r
	143	case 0x02: FaultSource = "Debug event fault"; break;\r
	144	case 0x03: FaultSource = "Access Flag fault on Section"; break;\r
	145	case 0x04: FaultSource = "Cache maintenance operation fault[2]"; break;\r
	146	case 0x05: FaultSource = "Translation fault on Section"; break;\r
	147	case 0x06: FaultSource = "Access Flag fault on Page"; break;\r
	148	case 0x07: FaultSource = "Translation fault on Page"; break;\r
	149	case 0x08: FaultSource = "Precise External Abort"; break;\r
	150	case 0x09: FaultSource = "Domain fault on Section"; break;\r
	151	case 0x0b: FaultSource = "Domain fault on Page"; break;\r
	152	case 0x0c: FaultSource = "External abort on translation, first level"; break;\r
	153	case 0x0d: FaultSource = "Permission fault on Section"; break;\r
	154	case 0x0e: FaultSource = "External abort on translation, second level"; break;\r
	155	case 0x0f: FaultSource = "Permission fault on Page"; break;\r
	156	case 0x16: FaultSource = "Imprecise External Abort"; break;\r
	157	default: FaultSource = "No function"; break;\r
	158	}\r
	159	\r
	160	return FaultSource;\r
	161	}\r
	162	\r
11c20f4e	163	STATIC CHAR8 *gExceptionTypeString[] = {\r
6f72e28d	164	"Reset",\r
6f72e28d	165	"Undefined OpCode",\r
619b3998	166	"SVC",\r
6f72e28d	167	"Prefetch Abort",\r
	168	"Data Abort",\r
	169	"Undefined",\r
	170	"IRQ",\r
	171	"FIQ"\r
	172	};\r
	173	\r
6f72e28d	174	/**\r
6f72e28d	175	This is the default action to take on an unexpected exception\r
3402aac7	176	\r
6f72e28d	177	Since this is exception context don't do anything crazy like try to allcoate memory.\r
	178	\r
	179	@param ExceptionType Type of the exception\r
	180	@param SystemContext Register state at the time of the Exception\r
	181	\r
	182	\r
	183	**/\r
	184	VOID\r
	185	DefaultExceptionHandler (\r
	186	IN EFI_EXCEPTION_TYPE ExceptionType,\r
	187	IN OUT EFI_SYSTEM_CONTEXT SystemContext\r
	188	)\r
	189	{\r
7755dfd3	190	CHAR8 Buffer[100];\r
7755dfd3	191	UINTN CharCount;\r
d5b0f232	192	UINT32 DfsrStatus;\r
65e27445	193	UINT32 IfsrStatus;\r
d5b0f232	194	BOOLEAN DfsrWrite;\r
d629c283	195	UINT32 PcAdjust = 0;\r
6f72e28d	196	\r
7755dfd3	197	CharCount = AsciiSPrint (Buffer,sizeof (Buffer),"\n%a Exception PC at 0x%08x CPSR 0x%08x ",\r
91c38d4e	198	gExceptionTypeString[ExceptionType], SystemContext.SystemContextArm->PC, SystemContext.SystemContextArm->CPSR);\r
31f53880 AB	199	SerialPortWrite ((UINT8 *)Buffer, CharCount);\r
	200	if (gST->ConOut != NULL) {\r
	201	AsciiPrint (Buffer);\r
	202	}\r
7755dfd3	203	\r
6f72e28d	204	DEBUG_CODE_BEGIN ();\r
	205	CHAR8 *Pdb;\r
	206	UINT32 ImageBase;\r
	207	UINT32 PeCoffSizeOfHeader;\r
	208	UINT32 Offset;\r
a1848bc0 LE	209	CHAR8 CpsrStr[CPSR_STRING_SIZE]; // char per bit. Lower 5-bits are mode\r
a1848bc0 LE	210	// that is a 3 char string\r
6f72e28d	211	CHAR8 Buffer[80];\r
097bd461	212	UINT8 *DisAsm;\r
f3198cba	213	UINT32 ItBlock;\r
3402aac7	214	\r
6f72e28d	215	CpsrString (SystemContext.SystemContextArm->CPSR, CpsrStr);\r
6f72e28d	216	DEBUG ((EFI_D_ERROR, "%a\n", CpsrStr));\r
3402aac7	217	\r
6f72e28d	218	Pdb = GetImageName (SystemContext.SystemContextArm->PC, &ImageBase, &PeCoffSizeOfHeader);\r
	219	Offset = SystemContext.SystemContextArm->PC - ImageBase;\r
	220	if (Pdb != NULL) {\r
	221	DEBUG ((EFI_D_ERROR, "%a\n", Pdb));\r
	222	\r
	223	//\r
3402aac7	224	// A PE/COFF image loads its headers into memory so the headers are\r
11c20f4e	225	// included in the linked addresses. ELF and Mach-O images do not\r
6f72e28d	226	// include the headers so the first byte of the image is usually\r
6f72e28d	227	// text (code). If you look at link maps from ELF or Mach-O images\r
11c20f4e	228	// you need to subtract out the size of the PE/COFF header to get\r
3402aac7	229	// get the offset that matches the link map.\r
6f72e28d	230	//\r
6f72e28d	231	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
3402aac7	232	\r
6f72e28d	233	// If we come from an image it is safe to show the instruction. We know it should not fault\r
097bd461	234	DisAsm = (UINT8 *)(UINTN)SystemContext.SystemContextArm->PC;\r
f3198cba	235	ItBlock = 0;\r
f3198cba	236	DisassembleInstruction (&DisAsm, (SystemContext.SystemContextArm->CPSR & BIT5) == BIT5, TRUE, &ItBlock, Buffer, sizeof (Buffer));\r
097bd461	237	DEBUG ((EFI_D_ERROR, "\n%a", Buffer));\r
3402aac7	238	\r
d629c283	239	switch (ExceptionType) {\r
	240	case EXCEPT_ARM_UNDEFINED_INSTRUCTION:\r
	241	case EXCEPT_ARM_SOFTWARE_INTERRUPT:\r
	242	case EXCEPT_ARM_PREFETCH_ABORT:\r
	243	case EXCEPT_ARM_DATA_ABORT:\r
	244	// advance PC past the faulting instruction\r
	245	PcAdjust = (UINTN)DisAsm - SystemContext.SystemContextArm->PC;\r
	246	break;\r
3402aac7	247	\r
d629c283	248	default:\r
	249	break;\r
	250	}\r
097bd461	251	\r
6f72e28d	252	}\r
	253	DEBUG_CODE_END ();\r
	254	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
	255	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
	256	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
	257	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	258	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
	259	\r
	260	// Bit10 is Status[4] Bit3:0 is Status[3:0]\r
	261	DfsrStatus = (SystemContext.SystemContextArm->DFSR & 0xf) \| ((SystemContext.SystemContextArm->DFSR >> 6) & 0x10);\r
	262	DfsrWrite = (SystemContext.SystemContextArm->DFSR & BIT11) != 0;\r
	263	if (DfsrStatus != 0x00) {\r
	264	DEBUG ((EFI_D_ERROR, " %a: %a 0x%08x\n", FaultStatusToString (DfsrStatus), DfsrWrite ? "write to" : "read from", SystemContext.SystemContextArm->DFAR));\r
	265	}\r
65e27445	266	\r
	267	IfsrStatus = (SystemContext.SystemContextArm->IFSR & 0xf) \| ((SystemContext.SystemContextArm->IFSR >> 6) & 0x10);\r
	268	if (IfsrStatus != 0) {\r
	269	DEBUG ((EFI_D_ERROR, " Instruction %a at 0x%08x\n", FaultStatusToString (SystemContext.SystemContextArm->IFSR & 0xf), SystemContext.SystemContextArm->IFAR));\r
d5b0f232	270	}\r
6f72e28d	271	\r
d5b0f232	272	DEBUG ((EFI_D_ERROR, "\n"));\r
6f72e28d	273	ASSERT (FALSE);\r
3402aac7	274	\r
5c8bc8be AB	275	CpuDeadLoop (); // may return if executing under a debugger\r
5c8bc8be AB	276	\r
bb02cb80	277	// Clear the error registers that we have already displayed incase some one wants to keep going\r
	278	SystemContext.SystemContextArm->DFSR = 0;\r
	279	SystemContext.SystemContextArm->IFSR = 0;\r
	280	\r
3402aac7	281	// If some one is stepping past the exception handler adjust the PC to point to the next instruction\r
d629c283	282	SystemContext.SystemContextArm->PC += PcAdjust;\r
6f72e28d	283	}\r