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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 |
4059386c | 7 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
6f72e28d | 8 | \r |
9 | **/\r | |
10 | \r | |
11 | #include <Uefi.h>\r | |
6f72e28d | 12 | #include <Library/BaseLib.h>\r |
13 | #include <Library/DebugLib.h>\r | |
14 | #include <Library/PeCoffGetEntryPointLib.h>\r | |
7755dfd3 | 15 | #include <Library/PrintLib.h>\r |
097bd461 | 16 | #include <Library/ArmDisassemblerLib.h>\r |
7755dfd3 | 17 | #include <Library/SerialPortLib.h>\r |
31f53880 | 18 | #include <Library/UefiBootServicesTableLib.h>\r |
00755e1c | 19 | #include <Library/UefiLib.h>\r |
6f72e28d | 20 | \r |
21 | #include <Guid/DebugImageInfoTable.h>\r | |
6f72e28d | 22 | \r |
619b3998 | 23 | #include <Protocol/DebugSupport.h>\r |
24 | #include <Library/DefaultExceptionHandlerLib.h>\r | |
6f72e28d | 25 | \r |
a1848bc0 LE |
26 | //\r |
27 | // The number of elements in a CHAR8 array, including the terminating NUL, that\r | |
28 | // is meant to hold the string rendering of the CPSR.\r | |
29 | //\r | |
30 | #define CPSR_STRING_SIZE 32\r | |
31 | \r | |
6f72e28d | 32 | typedef struct {\r |
33 | UINT32 BIT;\r | |
34 | CHAR8 Char;\r | |
35 | } CPSR_CHAR;\r | |
36 | \r | |
6f72e28d | 37 | CHAR8 *\r |
38 | GetImageName (\r | |
c63626b7 | 39 | IN UINTN FaultAddress,\r |
40 | OUT UINTN *ImageBase,\r | |
41 | OUT UINTN *PeCoffSizeOfHeaders\r | |
619b3998 | 42 | );\r |
6f72e28d | 43 | \r |
44 | /**\r | |
3402aac7 RC |
45 | Convert the Current Program Status Register (CPSR) to a string. The string is\r |
46 | a defacto standard in the ARM world.\r | |
47 | \r | |
6f72e28d | 48 | It is possible to add extra bits by adding them to CpsrChar array.\r |
49 | \r | |
50 | @param Cpsr ARM CPSR register value\r | |
a1848bc0 LE |
51 | @param ReturnStr CPSR_STRING_SIZE byte string that contains string\r |
52 | version of CPSR\r | |
6f72e28d | 53 | \r |
54 | **/\r | |
55 | VOID\r | |
56 | CpsrString (\r | |
57 | IN UINT32 Cpsr,\r | |
58 | OUT CHAR8 *ReturnStr\r | |
59 | )\r | |
60 | {\r | |
11c20f4e | 61 | UINTN Index;\r |
62 | CHAR8* Str;\r | |
63 | CHAR8* ModeStr;\r | |
6f72e28d | 64 | CPSR_CHAR CpsrChar[] = {\r |
65 | { 31, 'n' },\r | |
66 | { 30, 'z' },\r | |
67 | { 29, 'c' },\r | |
68 | { 28, 'v' },\r | |
69 | \r | |
70 | { 9, 'e' },\r | |
71 | { 8, 'a' },\r | |
72 | { 7, 'i' },\r | |
73 | { 6, 'f' },\r | |
74 | { 5, 't' },\r | |
75 | { 0, '?' }\r | |
76 | };\r | |
3402aac7 | 77 | \r |
11c20f4e | 78 | Str = ReturnStr;\r |
79 | \r | |
6f72e28d | 80 | for (Index = 0; CpsrChar[Index].BIT != 0; Index++, Str++) {\r |
81 | *Str = CpsrChar[Index].Char;\r | |
82 | if ((Cpsr & (1 << CpsrChar[Index].BIT)) != 0) {\r | |
83 | // Concert to upper case if bit is set\r | |
84 | *Str &= ~0x20;\r | |
85 | }\r | |
86 | }\r | |
3402aac7 | 87 | \r |
6f72e28d | 88 | *Str++ = '_';\r |
89 | *Str = '\0';\r | |
3402aac7 | 90 | \r |
6f72e28d | 91 | switch (Cpsr & 0x1f) {\r |
92 | case 0x10:\r | |
93 | ModeStr = "usr";\r | |
94 | break;\r | |
95 | case 0x011:\r | |
96 | ModeStr = "fiq";\r | |
97 | break;\r | |
98 | case 0x12:\r | |
99 | ModeStr = "irq";\r | |
100 | break;\r | |
101 | case 0x13:\r | |
102 | ModeStr = "svc";\r | |
103 | break;\r | |
104 | case 0x16:\r | |
105 | ModeStr = "mon";\r | |
106 | break;\r | |
107 | case 0x17:\r | |
108 | ModeStr = "abt";\r | |
109 | break;\r | |
110 | case 0x1b:\r | |
111 | ModeStr = "und";\r | |
112 | break;\r | |
113 | case 0x1f:\r | |
114 | ModeStr = "sys";\r | |
115 | break;\r | |
3402aac7 | 116 | \r |
6f72e28d | 117 | default:\r |
118 | ModeStr = "???";\r | |
119 | break;\r | |
120 | }\r | |
3402aac7 | 121 | \r |
a1848bc0 LE |
122 | //\r |
123 | // See the interface contract in the leading comment block.\r | |
124 | //\r | |
125 | AsciiStrCatS (Str, CPSR_STRING_SIZE - (Str - ReturnStr), ModeStr);\r | |
3402aac7 | 126 | }\r |
d5b0f232 | 127 | \r |
128 | CHAR8 *\r | |
129 | FaultStatusToString (\r | |
130 | IN UINT32 Status\r | |
131 | )\r | |
132 | {\r | |
133 | CHAR8 *FaultSource;\r | |
134 | \r | |
135 | switch (Status) {\r | |
136 | case 0x01: FaultSource = "Alignment fault"; break;\r | |
137 | case 0x02: FaultSource = "Debug event fault"; break;\r | |
138 | case 0x03: FaultSource = "Access Flag fault on Section"; break;\r | |
139 | case 0x04: FaultSource = "Cache maintenance operation fault[2]"; break;\r | |
140 | case 0x05: FaultSource = "Translation fault on Section"; break;\r | |
141 | case 0x06: FaultSource = "Access Flag fault on Page"; break;\r | |
142 | case 0x07: FaultSource = "Translation fault on Page"; break;\r | |
143 | case 0x08: FaultSource = "Precise External Abort"; break;\r | |
144 | case 0x09: FaultSource = "Domain fault on Section"; break;\r | |
145 | case 0x0b: FaultSource = "Domain fault on Page"; break;\r | |
146 | case 0x0c: FaultSource = "External abort on translation, first level"; break;\r | |
147 | case 0x0d: FaultSource = "Permission fault on Section"; break;\r | |
148 | case 0x0e: FaultSource = "External abort on translation, second level"; break;\r | |
149 | case 0x0f: FaultSource = "Permission fault on Page"; break;\r | |
150 | case 0x16: FaultSource = "Imprecise External Abort"; break;\r | |
151 | default: FaultSource = "No function"; break;\r | |
152 | }\r | |
153 | \r | |
154 | return FaultSource;\r | |
155 | }\r | |
156 | \r | |
11c20f4e | 157 | STATIC CHAR8 *gExceptionTypeString[] = {\r |
6f72e28d | 158 | "Reset",\r |
159 | "Undefined OpCode",\r | |
619b3998 | 160 | "SVC",\r |
6f72e28d | 161 | "Prefetch Abort",\r |
162 | "Data Abort",\r | |
163 | "Undefined",\r | |
164 | "IRQ",\r | |
165 | "FIQ"\r | |
166 | };\r | |
167 | \r | |
6f72e28d | 168 | /**\r |
169 | This is the default action to take on an unexpected exception\r | |
3402aac7 | 170 | \r |
ff5fef14 | 171 | Since this is exception context don't do anything crazy like try to allocate memory.\r |
6f72e28d | 172 | \r |
173 | @param ExceptionType Type of the exception\r | |
174 | @param SystemContext Register state at the time of the Exception\r | |
175 | \r | |
176 | \r | |
177 | **/\r | |
178 | VOID\r | |
179 | DefaultExceptionHandler (\r | |
180 | IN EFI_EXCEPTION_TYPE ExceptionType,\r | |
181 | IN OUT EFI_SYSTEM_CONTEXT SystemContext\r | |
182 | )\r | |
183 | {\r | |
7755dfd3 | 184 | CHAR8 Buffer[100];\r |
185 | UINTN CharCount;\r | |
d5b0f232 | 186 | UINT32 DfsrStatus;\r |
65e27445 | 187 | UINT32 IfsrStatus;\r |
d5b0f232 | 188 | BOOLEAN DfsrWrite;\r |
d629c283 | 189 | UINT32 PcAdjust = 0;\r |
6f72e28d | 190 | \r |
7755dfd3 | 191 | CharCount = AsciiSPrint (Buffer,sizeof (Buffer),"\n%a Exception PC at 0x%08x CPSR 0x%08x ",\r |
91c38d4e | 192 | gExceptionTypeString[ExceptionType], SystemContext.SystemContextArm->PC, SystemContext.SystemContextArm->CPSR);\r |
31f53880 AB |
193 | SerialPortWrite ((UINT8 *)Buffer, CharCount);\r |
194 | if (gST->ConOut != NULL) {\r | |
195 | AsciiPrint (Buffer);\r | |
196 | }\r | |
7755dfd3 | 197 | \r |
6f72e28d | 198 | DEBUG_CODE_BEGIN ();\r |
199 | CHAR8 *Pdb;\r | |
200 | UINT32 ImageBase;\r | |
201 | UINT32 PeCoffSizeOfHeader;\r | |
202 | UINT32 Offset;\r | |
a1848bc0 LE |
203 | CHAR8 CpsrStr[CPSR_STRING_SIZE]; // char per bit. Lower 5-bits are mode\r |
204 | // that is a 3 char string\r | |
6f72e28d | 205 | CHAR8 Buffer[80];\r |
097bd461 | 206 | UINT8 *DisAsm;\r |
f3198cba | 207 | UINT32 ItBlock;\r |
3402aac7 | 208 | \r |
6f72e28d | 209 | CpsrString (SystemContext.SystemContextArm->CPSR, CpsrStr);\r |
210 | DEBUG ((EFI_D_ERROR, "%a\n", CpsrStr));\r | |
3402aac7 | 211 | \r |
6f72e28d | 212 | Pdb = GetImageName (SystemContext.SystemContextArm->PC, &ImageBase, &PeCoffSizeOfHeader);\r |
213 | Offset = SystemContext.SystemContextArm->PC - ImageBase;\r | |
214 | if (Pdb != NULL) {\r | |
215 | DEBUG ((EFI_D_ERROR, "%a\n", Pdb));\r | |
216 | \r | |
217 | //\r | |
3402aac7 | 218 | // A PE/COFF image loads its headers into memory so the headers are\r |
11c20f4e | 219 | // included in the linked addresses. ELF and Mach-O images do not\r |
6f72e28d | 220 | // include the headers so the first byte of the image is usually\r |
221 | // text (code). If you look at link maps from ELF or Mach-O images\r | |
11c20f4e | 222 | // you need to subtract out the size of the PE/COFF header to get\r |
3402aac7 | 223 | // get the offset that matches the link map.\r |
6f72e28d | 224 | //\r |
225 | 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 | 226 | \r |
6f72e28d | 227 | // If we come from an image it is safe to show the instruction. We know it should not fault\r |
097bd461 | 228 | DisAsm = (UINT8 *)(UINTN)SystemContext.SystemContextArm->PC;\r |
f3198cba | 229 | ItBlock = 0;\r |
230 | DisassembleInstruction (&DisAsm, (SystemContext.SystemContextArm->CPSR & BIT5) == BIT5, TRUE, &ItBlock, Buffer, sizeof (Buffer));\r | |
097bd461 | 231 | DEBUG ((EFI_D_ERROR, "\n%a", Buffer));\r |
3402aac7 | 232 | \r |
d629c283 | 233 | switch (ExceptionType) {\r |
234 | case EXCEPT_ARM_UNDEFINED_INSTRUCTION:\r | |
235 | case EXCEPT_ARM_SOFTWARE_INTERRUPT:\r | |
236 | case EXCEPT_ARM_PREFETCH_ABORT:\r | |
237 | case EXCEPT_ARM_DATA_ABORT:\r | |
238 | // advance PC past the faulting instruction\r | |
239 | PcAdjust = (UINTN)DisAsm - SystemContext.SystemContextArm->PC;\r | |
240 | break;\r | |
3402aac7 | 241 | \r |
d629c283 | 242 | default:\r |
243 | break;\r | |
244 | }\r | |
097bd461 | 245 | \r |
6f72e28d | 246 | }\r |
247 | DEBUG_CODE_END ();\r | |
248 | 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 | |
249 | 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 | |
250 | 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 | |
251 | 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 | 252 | 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 |
253 | \r | |
254 | // Bit10 is Status[4] Bit3:0 is Status[3:0]\r | |
255 | DfsrStatus = (SystemContext.SystemContextArm->DFSR & 0xf) | ((SystemContext.SystemContextArm->DFSR >> 6) & 0x10);\r | |
256 | DfsrWrite = (SystemContext.SystemContextArm->DFSR & BIT11) != 0;\r | |
257 | if (DfsrStatus != 0x00) {\r | |
258 | DEBUG ((EFI_D_ERROR, " %a: %a 0x%08x\n", FaultStatusToString (DfsrStatus), DfsrWrite ? "write to" : "read from", SystemContext.SystemContextArm->DFAR));\r | |
259 | }\r | |
65e27445 | 260 | \r |
261 | IfsrStatus = (SystemContext.SystemContextArm->IFSR & 0xf) | ((SystemContext.SystemContextArm->IFSR >> 6) & 0x10);\r | |
262 | if (IfsrStatus != 0) {\r | |
263 | DEBUG ((EFI_D_ERROR, " Instruction %a at 0x%08x\n", FaultStatusToString (SystemContext.SystemContextArm->IFSR & 0xf), SystemContext.SystemContextArm->IFAR));\r | |
d5b0f232 | 264 | }\r |
6f72e28d | 265 | \r |
d5b0f232 | 266 | DEBUG ((EFI_D_ERROR, "\n"));\r |
6f72e28d | 267 | ASSERT (FALSE);\r |
3402aac7 | 268 | \r |
5c8bc8be AB |
269 | CpuDeadLoop (); // may return if executing under a debugger\r |
270 | \r | |
bb02cb80 | 271 | // Clear the error registers that we have already displayed incase some one wants to keep going\r |
272 | SystemContext.SystemContextArm->DFSR = 0;\r | |
273 | SystemContext.SystemContextArm->IFSR = 0;\r | |
274 | \r | |
3402aac7 | 275 | // If some one is stepping past the exception handler adjust the PC to point to the next instruction\r |
d629c283 | 276 | SystemContext.SystemContextArm->PC += PcAdjust;\r |
6f72e28d | 277 | }\r |