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969eba7b | 1 | /** @file\r |
2 | Processor specific parts of the GDB stub\r | |
3 | \r | |
60274cca | 4 | Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>\r |
3402aac7 | 5 | \r |
60274cca | 6 | This program and the accompanying materials\r |
969eba7b | 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 | \r | |
17 | #include <GdbDebugAgent.h>\r | |
969eba7b | 18 | #include <Library/PrintLib.h>\r |
19 | #include <Library/ArmLib.h>\r | |
20 | \r | |
21 | //\r | |
22 | // Externs from the exception handler assembly file\r | |
23 | //\r | |
24 | VOID\r | |
25 | ExceptionHandlersStart (\r | |
26 | VOID\r | |
27 | );\r | |
28 | \r | |
29 | VOID\r | |
30 | ExceptionHandlersEnd (\r | |
31 | VOID\r | |
32 | );\r | |
33 | \r | |
34 | VOID\r | |
35 | CommonExceptionEntry (\r | |
36 | VOID\r | |
37 | );\r | |
38 | \r | |
39 | VOID\r | |
40 | AsmCommonExceptionEntry (\r | |
41 | VOID\r | |
42 | );\r | |
43 | \r | |
44 | \r | |
45 | //\r | |
46 | // Array of exception types that need to be hooked by the debugger\r | |
47 | // (efi, gdb) //efi number\r | |
48 | //\r | |
49 | EFI_EXCEPTION_TYPE_ENTRY gExceptionType[] = {\r | |
50 | { EXCEPT_ARM_SOFTWARE_INTERRUPT, GDB_SIGTRAP },\r | |
3402aac7 RC |
51 | { EXCEPT_ARM_UNDEFINED_INSTRUCTION, GDB_SIGTRAP },\r |
52 | { EXCEPT_ARM_PREFETCH_ABORT, GDB_SIGTRAP },\r | |
969eba7b | 53 | { EXCEPT_ARM_DATA_ABORT, GDB_SIGTRAP }, // GDB_SIGEMT\r |
54 | { EXCEPT_ARM_RESERVED, GDB_SIGTRAP }, // GDB_SIGILL\r | |
55 | { EXCEPT_ARM_FIQ, GDB_SIGINT } // Used for ctrl-c\r | |
56 | };\r | |
57 | \r | |
58 | // Shut up some annoying RVCT warnings\r | |
59 | #ifdef __CC_ARM\r | |
60 | #pragma diag_suppress 1296\r | |
61 | #endif\r | |
62 | \r | |
63 | UINTN gRegisterOffsets[] = {\r | |
64 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R0),\r | |
65 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R1),\r | |
66 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R2),\r | |
67 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R3),\r | |
68 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R4),\r | |
69 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R5),\r | |
70 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R6),\r | |
71 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R7),\r | |
72 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R8),\r | |
73 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R9),\r | |
74 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R10),\r | |
75 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R11),\r | |
76 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R12),\r | |
77 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, SP),\r | |
78 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, LR),\r | |
79 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, PC),\r | |
80 | 0x00000F01, // f0\r | |
81 | 0x00000F02,\r | |
82 | 0x00000F03,\r | |
83 | 0x00000F11, // f1\r | |
84 | 0x00000F12,\r | |
85 | 0x00000F13,\r | |
86 | 0x00000F21, // f2\r | |
87 | 0x00000F22,\r | |
88 | 0x00000F23,\r | |
89 | 0x00000F31, // f3\r | |
90 | 0x00000F32,\r | |
91 | 0x00000F33,\r | |
92 | 0x00000F41, // f4\r | |
93 | 0x00000F42,\r | |
94 | 0x00000F43,\r | |
95 | 0x00000F51, // f5\r | |
96 | 0x00000F52,\r | |
97 | 0x00000F53,\r | |
98 | 0x00000F61, // f6\r | |
99 | 0x00000F62,\r | |
100 | 0x00000F63,\r | |
101 | 0x00000F71, // f7\r | |
102 | 0x00000F72,\r | |
103 | 0x00000F73,\r | |
104 | 0x00000FFF, // fps\r | |
105 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, CPSR)\r | |
106 | };\r | |
107 | \r | |
108 | // restore warnings for RVCT\r | |
109 | #ifdef __CC_ARM\r | |
110 | #pragma diag_default 1296\r | |
111 | #endif\r | |
112 | \r | |
113 | \r | |
114 | /**\r | |
115 | Return the number of entries in the gExceptionType[]\r | |
3402aac7 RC |
116 | \r |
117 | @retval UINTN, the number of entries in the gExceptionType[] array.\r | |
969eba7b | 118 | **/\r |
119 | UINTN\r | |
120 | MaxEfiException (\r | |
121 | VOID\r | |
122 | )\r | |
123 | {\r | |
124 | return sizeof (gExceptionType)/sizeof (EFI_EXCEPTION_TYPE_ENTRY);\r | |
125 | }\r | |
126 | \r | |
127 | \r | |
128 | \r | |
129 | \r | |
130 | /**\r | |
3402aac7 | 131 | Check to see if the ISA is supported.\r |
969eba7b | 132 | ISA = Instruction Set Architecture\r |
133 | \r | |
3402aac7 | 134 | @retval TRUE if Isa is supported\r |
969eba7b | 135 | \r |
136 | **/\r | |
137 | BOOLEAN\r | |
138 | CheckIsa (\r | |
139 | IN EFI_INSTRUCTION_SET_ARCHITECTURE Isa\r | |
140 | )\r | |
141 | {\r | |
142 | if (Isa == IsaArm) {\r | |
143 | return TRUE;\r | |
144 | } else {\r | |
145 | return FALSE;\r | |
146 | }\r | |
147 | }\r | |
148 | \r | |
149 | \r | |
150 | /**\r | |
151 | This takes in the register number and the System Context, and returns a pointer to the RegNumber-th register in gdb ordering\r | |
152 | It is, by default, set to find the register pointer of the ARM member\r | |
3402aac7 | 153 | @param SystemContext Register content at time of the exception\r |
969eba7b | 154 | @param RegNumber The register to which we want to find a pointer\r |
155 | @retval the pointer to the RegNumber-th pointer\r | |
3402aac7 | 156 | **/\r |
969eba7b | 157 | UINTN *\r |
158 | FindPointerToRegister(\r | |
159 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
3402aac7 | 160 | IN UINTN RegNumber\r |
969eba7b | 161 | )\r |
162 | {\r | |
163 | UINT8 *TempPtr;\r | |
164 | ASSERT(gRegisterOffsets[RegNumber] < 0xF00);\r | |
165 | TempPtr = ((UINT8 *)SystemContext.SystemContextArm) + gRegisterOffsets[RegNumber];\r | |
166 | return (UINT32 *)TempPtr;\r | |
167 | }\r | |
168 | \r | |
169 | \r | |
170 | /**\r | |
171 | Adds the RegNumber-th register's value to the output buffer, starting at the given OutBufPtr\r | |
172 | @param SystemContext Register content at time of the exception\r | |
173 | @param RegNumber the number of the register that we want to read\r | |
174 | @param OutBufPtr pointer to the output buffer's end. the new data will be added from this point on.\r | |
175 | @retval the pointer to the next character of the output buffer that is available to be written on.\r | |
176 | **/\r | |
177 | CHAR8 *\r | |
178 | BasicReadRegister (\r | |
179 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
180 | IN UINTN RegNumber,\r | |
181 | IN CHAR8 *OutBufPtr\r | |
182 | )\r | |
183 | {\r | |
184 | UINTN RegSize;\r | |
185 | CHAR8 Char;\r | |
3402aac7 | 186 | \r |
969eba7b | 187 | if (gRegisterOffsets[RegNumber] > 0xF00) {\r |
188 | AsciiSPrint(OutBufPtr, 9, "00000000");\r | |
189 | OutBufPtr += 8;\r | |
190 | return OutBufPtr;\r | |
191 | }\r | |
192 | \r | |
193 | RegSize = 0;\r | |
194 | while (RegSize < 32) {\r | |
195 | Char = mHexToStr[(UINT8)((*FindPointerToRegister(SystemContext, RegNumber) >> (RegSize+4)) & 0xf)];\r | |
196 | if ((Char >= 'A') && (Char <= 'F')) {\r | |
197 | Char = Char - 'A' + 'a';\r | |
198 | }\r | |
199 | *OutBufPtr++ = Char;\r | |
3402aac7 | 200 | \r |
969eba7b | 201 | Char = mHexToStr[(UINT8)((*FindPointerToRegister(SystemContext, RegNumber) >> RegSize) & 0xf)];\r |
202 | if ((Char >= 'A') && (Char <= 'F')) {\r | |
203 | Char = Char - 'A' + 'a';\r | |
204 | }\r | |
205 | *OutBufPtr++ = Char;\r | |
3402aac7 | 206 | \r |
969eba7b | 207 | RegSize = RegSize + 8;\r |
208 | }\r | |
209 | return OutBufPtr;\r | |
210 | }\r | |
211 | \r | |
212 | \r | |
11c20f4e | 213 | /**\r |
3402aac7 | 214 | Reads the n-th register's value into an output buffer and sends it as a packet\r |
969eba7b | 215 | @param SystemContext Register content at time of the exception\r |
216 | @param InBuffer Pointer to the input buffer received from gdb server\r | |
217 | **/\r | |
218 | VOID\r | |
219 | ReadNthRegister (\r | |
220 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
221 | IN CHAR8 *InBuffer\r | |
222 | )\r | |
223 | {\r | |
224 | UINTN RegNumber;\r | |
225 | CHAR8 OutBuffer[9]; // 1 reg=8 hex chars, and the end '\0' (escape seq)\r | |
226 | CHAR8 *OutBufPtr; // pointer to the output buffer\r | |
3402aac7 | 227 | \r |
969eba7b | 228 | RegNumber = AsciiStrHexToUintn (&InBuffer[1]);\r |
3402aac7 | 229 | \r |
969eba7b | 230 | if (RegNumber >= (sizeof (gRegisterOffsets)/sizeof (UINTN))) {\r |
3402aac7 | 231 | SendError (GDB_EINVALIDREGNUM);\r |
969eba7b | 232 | return;\r |
233 | }\r | |
3402aac7 | 234 | \r |
969eba7b | 235 | OutBufPtr = OutBuffer;\r |
236 | OutBufPtr = BasicReadRegister (SystemContext, RegNumber, OutBufPtr);\r | |
3402aac7 | 237 | \r |
969eba7b | 238 | *OutBufPtr = '\0'; // the end of the buffer\r |
239 | SendPacket(OutBuffer);\r | |
240 | }\r | |
241 | \r | |
242 | \r | |
11c20f4e | 243 | /**\r |
3402aac7 | 244 | Reads the general registers into an output buffer and sends it as a packet\r |
969eba7b | 245 | @param SystemContext Register content at time of the exception\r |
246 | **/\r | |
247 | VOID\r | |
248 | EFIAPI\r | |
3402aac7 | 249 | ReadGeneralRegisters (\r |
969eba7b | 250 | IN EFI_SYSTEM_CONTEXT SystemContext\r |
251 | )\r | |
252 | {\r | |
253 | UINTN Index;\r | |
254 | // a UINT32 takes 8 ascii characters\r | |
255 | CHAR8 OutBuffer[(sizeof (gRegisterOffsets) * 2) + 1];\r | |
256 | CHAR8 *OutBufPtr;\r | |
3402aac7 | 257 | \r |
969eba7b | 258 | // It is not safe to allocate pool here....\r |
259 | OutBufPtr = OutBuffer;\r | |
260 | for (Index = 0; Index < (sizeof (gRegisterOffsets)/sizeof (UINTN)); Index++) {\r | |
261 | OutBufPtr = BasicReadRegister (SystemContext, Index, OutBufPtr);\r | |
262 | }\r | |
3402aac7 | 263 | \r |
969eba7b | 264 | *OutBufPtr = '\0';\r |
265 | SendPacket(OutBuffer);\r | |
266 | }\r | |
267 | \r | |
268 | \r | |
269 | /**\r | |
270 | Adds the RegNumber-th register's value to the output buffer, starting at the given OutBufPtr\r | |
271 | @param SystemContext Register content at time of the exception\r | |
272 | @param RegNumber the number of the register that we want to write\r | |
273 | @param InBufPtr pointer to the output buffer. the new data will be extracted from the input buffer from this point on.\r | |
274 | @retval the pointer to the next character of the input buffer that can be used\r | |
275 | **/\r | |
276 | CHAR8 *\r | |
277 | BasicWriteRegister (\r | |
278 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
279 | IN UINTN RegNumber,\r | |
280 | IN CHAR8 *InBufPtr\r | |
281 | )\r | |
282 | {\r | |
283 | UINTN RegSize;\r | |
284 | UINTN TempValue; // the value transferred from a hex char\r | |
285 | UINT32 NewValue; // the new value of the RegNumber-th Register\r | |
3402aac7 | 286 | \r |
969eba7b | 287 | if (gRegisterOffsets[RegNumber] > 0xF00) {\r |
288 | return InBufPtr + 8;\r | |
289 | }\r | |
290 | \r | |
291 | NewValue = 0;\r | |
292 | RegSize = 0;\r | |
293 | while (RegSize < 32) {\r | |
294 | TempValue = HexCharToInt(*InBufPtr++);\r | |
3402aac7 | 295 | \r |
969eba7b | 296 | if ((INTN)TempValue < 0) {\r |
3402aac7 | 297 | SendError (GDB_EBADMEMDATA);\r |
969eba7b | 298 | return NULL;\r |
299 | }\r | |
3402aac7 | 300 | \r |
969eba7b | 301 | NewValue += (TempValue << (RegSize+4));\r |
302 | TempValue = HexCharToInt(*InBufPtr++);\r | |
3402aac7 | 303 | \r |
969eba7b | 304 | if ((INTN)TempValue < 0) {\r |
3402aac7 | 305 | SendError (GDB_EBADMEMDATA);\r |
969eba7b | 306 | return NULL;\r |
307 | }\r | |
3402aac7 RC |
308 | \r |
309 | NewValue += (TempValue << RegSize);\r | |
969eba7b | 310 | RegSize = RegSize + 8;\r |
311 | }\r | |
312 | *(FindPointerToRegister(SystemContext, RegNumber)) = NewValue;\r | |
313 | return InBufPtr;\r | |
314 | }\r | |
315 | \r | |
316 | \r | |
317 | /** ‘P n...=r...’\r | |
318 | Writes the new value of n-th register received into the input buffer to the n-th register\r | |
319 | @param SystemContext Register content at time of the exception\r | |
320 | @param InBuffer Ponter to the input buffer received from gdb server\r | |
321 | **/\r | |
322 | VOID\r | |
323 | WriteNthRegister (\r | |
324 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
325 | IN CHAR8 *InBuffer\r | |
326 | )\r | |
327 | {\r | |
328 | UINTN RegNumber;\r | |
329 | CHAR8 RegNumBuffer[MAX_REG_NUM_BUF_SIZE]; // put the 'n..' part of the message into this array\r | |
330 | CHAR8 *RegNumBufPtr;\r | |
331 | CHAR8 *InBufPtr; // pointer to the input buffer\r | |
3402aac7 | 332 | \r |
969eba7b | 333 | // find the register number to write\r |
334 | InBufPtr = &InBuffer[1];\r | |
335 | RegNumBufPtr = RegNumBuffer;\r | |
336 | while (*InBufPtr != '=') {\r | |
337 | *RegNumBufPtr++ = *InBufPtr++;\r | |
3402aac7 | 338 | }\r |
969eba7b | 339 | *RegNumBufPtr = '\0';\r |
3402aac7 RC |
340 | RegNumber = AsciiStrHexToUintn (RegNumBuffer);\r |
341 | \r | |
969eba7b | 342 | // check if this is a valid Register Number\r |
343 | if (RegNumber >= (sizeof (gRegisterOffsets)/sizeof (UINTN))) {\r | |
3402aac7 | 344 | SendError (GDB_EINVALIDREGNUM);\r |
969eba7b | 345 | return;\r |
346 | }\r | |
347 | InBufPtr++; // skips the '=' character\r | |
348 | BasicWriteRegister (SystemContext, RegNumber, InBufPtr);\r | |
349 | SendSuccess();\r | |
350 | }\r | |
351 | \r | |
352 | \r | |
353 | /** ‘G XX...’\r | |
354 | Writes the new values received into the input buffer to the general registers\r | |
355 | @param SystemContext Register content at time of the exception\r | |
356 | @param InBuffer Pointer to the input buffer received from gdb server\r | |
357 | **/\r | |
358 | \r | |
359 | VOID\r | |
360 | EFIAPI\r | |
361 | WriteGeneralRegisters (\r | |
362 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
363 | IN CHAR8 *InBuffer\r | |
364 | )\r | |
365 | {\r | |
366 | UINTN i;\r | |
367 | CHAR8 *InBufPtr; /// pointer to the input buffer\r | |
368 | UINTN MinLength;\r | |
369 | UINTN RegisterCount = (sizeof (gRegisterOffsets)/sizeof (UINTN));\r | |
370 | \r | |
371 | MinLength = (RegisterCount * 8) + 1; // 'G' plus the registers in ASCII format\r | |
3402aac7 | 372 | \r |
969eba7b | 373 | if (AsciiStrLen(InBuffer) < MinLength) {\r |
3402aac7 RC |
374 | //Bad message. Message is not the right length\r |
375 | SendError (GDB_EBADBUFSIZE);\r | |
969eba7b | 376 | return;\r |
377 | }\r | |
3402aac7 | 378 | \r |
969eba7b | 379 | InBufPtr = &InBuffer[1];\r |
3402aac7 | 380 | \r |
969eba7b | 381 | // Read the new values for the registers from the input buffer to an array, NewValueArray.\r |
382 | // The values in the array are in the gdb ordering\r | |
383 | for(i = 0; i < RegisterCount; i++) {\r | |
384 | InBufPtr = BasicWriteRegister (SystemContext, i, InBufPtr);\r | |
385 | }\r | |
3402aac7 | 386 | \r |
969eba7b | 387 | SendSuccess ();\r |
388 | }\r | |
389 | \r | |
390 | \r | |
391 | \r | |
392 | \r | |
11c20f4e | 393 | /**\r |
3402aac7 | 394 | Continue. addr is Address to resume. If addr is omitted, resume at current\r |
969eba7b | 395 | Address.\r |
3402aac7 RC |
396 | \r |
397 | @param SystemContext Register content at time of the exception\r | |
969eba7b | 398 | **/\r |
399 | VOID\r | |
400 | EFIAPI\r | |
401 | ContinueAtAddress (\r | |
402 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
403 | IN CHAR8 *PacketData\r | |
404 | )\r | |
405 | {\r | |
406 | if (PacketData[1] != '\0') {\r | |
407 | SystemContext.SystemContextArm->PC = AsciiStrHexToUintn(&PacketData[1]);\r | |
3402aac7 | 408 | }\r |
969eba7b | 409 | }\r |
410 | \r | |
411 | \r | |
412 | /** ‘s [addr ]’\r | |
3402aac7 | 413 | Single step. addr is the Address at which to resume. If addr is omitted, resume\r |
969eba7b | 414 | at same Address.\r |
3402aac7 RC |
415 | \r |
416 | @param SystemContext Register content at time of the exception\r | |
969eba7b | 417 | **/\r |
418 | VOID\r | |
419 | EFIAPI\r | |
420 | SingleStep (\r | |
421 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
422 | IN CHAR8 *PacketData\r | |
423 | )\r | |
424 | {\r | |
425 | SendNotSupported();\r | |
426 | }\r | |
427 | \r | |
428 | \r | |
429 | VOID\r | |
430 | EFIAPI\r | |
431 | InsertBreakPoint (\r | |
432 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
433 | IN CHAR8 *PacketData\r | |
434 | )\r | |
435 | {\r | |
436 | SendNotSupported ();\r | |
437 | }\r | |
438 | \r | |
439 | VOID\r | |
440 | EFIAPI\r | |
441 | RemoveBreakPoint (\r | |
442 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
443 | IN CHAR8 *PacketData\r | |
444 | )\r | |
445 | {\r | |
446 | SendNotSupported ();\r | |
447 | }\r | |
448 | \r | |
449 | \r | |
1e57a462 | 450 | /**\r |
3402aac7 | 451 | Send the T signal with the given exception type (in gdb order) and possibly\r |
1e57a462 | 452 | with n:r pairs related to the watchpoints\r |
3402aac7 | 453 | \r |
1e57a462 | 454 | @param SystemContext Register content at time of the exception\r |
455 | @param GdbExceptionType GDB exception type\r | |
456 | **/\r | |
457 | VOID\r | |
458 | ProcessorSendTSignal (\r | |
459 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
460 | IN UINT8 GdbExceptionType,\r | |
461 | IN OUT CHAR8 *TSignalPtr,\r | |
462 | IN UINTN SizeOfBuffer\r | |
463 | )\r | |
464 | {\r | |
465 | *TSignalPtr = '\0';\r | |
466 | }\r | |
969eba7b | 467 | \r |
bb5127ae | 468 | /**\r |
469 | FIQ state is only changed by FIQ exception. We don't want to take FIQ\r | |
3402aac7 | 470 | ticks in the GDB stub. The stub disables FIQ on entry, but this is the\r |
bb5127ae | 471 | third instruction that executes in the execption handler. Thus we have\r |
472 | a crack we need to test for.\r | |
473 | \r | |
474 | @param PC PC of execption\r | |
475 | \r | |
3402aac7 | 476 | @return TRUE We are in the GDB stub exception preamble\r |
bb5127ae | 477 | @return FALSE We are not in GDB stub code\r |
1e57a462 | 478 | **/\r |
479 | BOOLEAN\r | |
480 | InFiqCrack (\r | |
481 | IN UINT32 PC\r | |
482 | )\r | |
483 | {\r | |
f0bbcdf8 | 484 | UINT64 VectorBase = PcdGet64 (PcdCpuVectorBaseAddress);\r |
1e57a462 | 485 | UINT32 Length = (UINTN)ExceptionHandlersEnd - (UINTN)ExceptionHandlersStart;\r |
486 | \r | |
487 | if ((PC >= VectorBase) && (PC <= (VectorBase + Length))) {\r | |
488 | return TRUE;\r | |
489 | }\r | |
490 | \r | |
491 | return FALSE;\r | |
492 | }\r | |
bb5127ae | 493 | \r |
494 | \r | |
969eba7b | 495 | /**\r |
496 | Check to see if this exception is related to ctrl-c handling.\r | |
497 | \r | |
3402aac7 RC |
498 | In this scheme we dedicate FIQ to the ctrl-c handler so it is\r |
499 | independent of the rest of the system.\r | |
500 | \r | |
501 | SaveAndSetDebugTimerInterrupt () can be used to\r | |
969eba7b | 502 | \r |
503 | @param ExceptionType Exception that is being processed\r | |
3402aac7 | 504 | @param SystemContext Register content at time of the exception\r |
969eba7b | 505 | \r |
506 | @return TRUE This was a ctrl-c check that did not find a ctrl-c\r | |
507 | @return FALSE This was not a ctrl-c check or some one hit ctrl-c\r | |
508 | **/\r | |
509 | BOOLEAN\r | |
3402aac7 RC |
510 | ProcessorControlC (\r |
511 | IN EFI_EXCEPTION_TYPE ExceptionType,\r | |
512 | IN OUT EFI_SYSTEM_CONTEXT SystemContext\r | |
969eba7b | 513 | )\r |
514 | {\r | |
bb5127ae | 515 | CHAR8 Char;\r |
969eba7b | 516 | BOOLEAN Return = TRUE;\r |
517 | \r | |
518 | if (ExceptionType != EXCEPT_ARM_FIQ) {\r | |
519 | // Skip it as it is not related to ctrl-c\r | |
520 | return FALSE;\r | |
521 | }\r | |
522 | \r | |
bb5127ae | 523 | if (InFiqCrack (SystemContext.SystemContextArm->PC)) {\r |
524 | // We are in our own interrupt preable, so skip this tick.\r | |
525 | // We never want to let gdb see the debug stub running if we can help it\r | |
526 | return FALSE;\r | |
527 | }\r | |
528 | \r | |
1e57a462 | 529 | while (TRUE) {\r |
530 | if (!GdbIsCharAvailable ()) {\r | |
531 | //\r | |
532 | // No characters are pending so exit the loop\r | |
533 | //\r | |
534 | Return = TRUE;\r | |
535 | break;\r | |
536 | }\r | |
3402aac7 | 537 | \r |
1e57a462 | 538 | Char = GdbGetChar ();\r |
539 | if (Char == 0x03) {\r | |
540 | //\r | |
541 | // We have a ctrl-c so exit and process exception for ctrl-c\r | |
542 | //\r | |
543 | Return = FALSE;\r | |
544 | break;\r | |
545 | }\r | |
546 | }\r | |
969eba7b | 547 | \r |
548 | DebugAgentTimerEndOfInterrupt ();\r | |
549 | \r | |
550 | // Force an exit from the exception handler as we are done\r | |
551 | return Return;\r | |
552 | }\r | |
553 | \r | |
554 | \r | |
555 | /**\r | |
556 | Enable/Disable the interrupt of debug timer and return the interrupt state\r | |
557 | prior to the operation.\r | |
558 | \r | |
559 | If EnableStatus is TRUE, enable the interrupt of debug timer.\r | |
560 | If EnableStatus is FALSE, disable the interrupt of debug timer.\r | |
561 | \r | |
562 | @param[in] EnableStatus Enable/Disable.\r | |
563 | \r | |
bb5127ae | 564 | @retval TRUE Debug timer interrupt were enabled on entry to this call.\r |
565 | @retval FALSE Debug timer interrupt were disabled on entry to this call.\r | |
969eba7b | 566 | \r |
567 | **/\r | |
568 | BOOLEAN\r | |
569 | EFIAPI\r | |
570 | SaveAndSetDebugTimerInterrupt (\r | |
571 | IN BOOLEAN EnableStatus\r | |
572 | )\r | |
573 | {\r | |
574 | BOOLEAN FiqEnabled;\r | |
575 | \r | |
576 | FiqEnabled = ArmGetFiqState ();\r | |
577 | \r | |
578 | if (EnableStatus) {\r | |
bb5127ae | 579 | DebugAgentTimerSetPeriod (PcdGet32 (PcdGdbTimerPeriodMilliseconds));\r |
969eba7b | 580 | ArmEnableFiq ();\r |
581 | } else {\r | |
582 | DebugAgentTimerSetPeriod (0);\r | |
583 | ArmDisableFiq ();\r | |
584 | }\r | |
585 | \r | |
586 | return FiqEnabled;\r | |
587 | }\r | |
588 | \r | |
bb5127ae | 589 | \r |
590 | \r | |
969eba7b | 591 | VOID\r |
592 | GdbFPutString (\r | |
593 | IN CHAR8 *String\r | |
594 | );\r | |
595 | \r | |
596 | /**\r | |
597 | Initialize debug agent.\r | |
598 | \r | |
685f8c76 | 599 | This function is used to set up debug environment to support source level debugging.\r |
600 | If certain Debug Agent Library instance has to save some private data in the stack,\r | |
601 | this function must work on the mode that doesn't return to the caller, then\r | |
602 | the caller needs to wrap up all rest of logic after InitializeDebugAgent() into one\r | |
603 | function and pass it into InitializeDebugAgent(). InitializeDebugAgent() is\r | |
604 | responsible to invoke the passing-in function at the end of InitializeDebugAgent().\r | |
969eba7b | 605 | \r |
4f0624e8 | 606 | If the parameter Function is not NULL, Debug Agent Library instance will invoke it by\r |
685f8c76 | 607 | passing in the Context to be its parameter.\r |
608 | \r | |
609 | If Function() is NULL, Debug Agent Library instance will return after setup debug\r | |
610 | environment.\r | |
611 | \r | |
612 | @param[in] InitFlag Init flag is used to decide the initialize process.\r | |
613 | @param[in] Context Context needed according to InitFlag; it was optional.\r | |
614 | @param[in] Function Continue function called by debug agent library; it was\r | |
615 | optional.\r | |
969eba7b | 616 | \r |
617 | **/\r | |
618 | VOID\r | |
619 | EFIAPI\r | |
620 | InitializeDebugAgent (\r | |
621 | IN UINT32 InitFlag,\r | |
685f8c76 | 622 | IN VOID *Context, OPTIONAL\r |
623 | IN DEBUG_AGENT_CONTINUE Function OPTIONAL\r | |
969eba7b | 624 | )\r |
3402aac7 | 625 | {\r |
969eba7b | 626 | UINTN Offset;\r |
627 | UINTN Length;\r | |
628 | BOOLEAN IrqEnabled;\r | |
f0bbcdf8 | 629 | UINT64 *VectorBase;\r |
969eba7b | 630 | \r |
1e57a462 | 631 | \r |
969eba7b | 632 | //\r |
633 | // Disable interrupts\r | |
634 | //\r | |
635 | IrqEnabled = ArmGetInterruptState ();\r | |
636 | ArmDisableInterrupts ();\r | |
969eba7b | 637 | ArmDisableFiq ();\r |
638 | \r | |
639 | //\r | |
640 | // Copy an implementation of the ARM exception vectors to PcdCpuVectorBaseAddress.\r | |
641 | //\r | |
642 | Length = (UINTN)ExceptionHandlersEnd - (UINTN)ExceptionHandlersStart;\r | |
643 | \r | |
644 | //\r | |
645 | // Reserve space for the exception handlers\r | |
646 | //\r | |
f0bbcdf8 | 647 | VectorBase = (UINT64 *)(UINTN)PcdGet64 (PcdCpuVectorBaseAddress);\r |
969eba7b | 648 | \r |
649 | \r | |
3402aac7 | 650 | // Copy our assembly code into the page that contains the exception vectors.\r |
969eba7b | 651 | CopyMem ((VOID *)VectorBase, (VOID *)ExceptionHandlersStart, Length);\r |
652 | \r | |
653 | //\r | |
654 | // Patch in the common Assembly exception handler\r | |
655 | //\r | |
656 | Offset = (UINTN)CommonExceptionEntry - (UINTN)ExceptionHandlersStart;\r | |
657 | *(UINTN *) (((UINT8 *)VectorBase) + Offset) = (UINTN)AsmCommonExceptionEntry;\r | |
658 | \r | |
659 | // Flush Caches since we updated executable stuff\r | |
f0bbcdf8 | 660 | InvalidateInstructionCacheRange ((VOID *)PcdGet64(PcdCpuVectorBaseAddress), Length);\r |
969eba7b | 661 | \r |
bb5127ae | 662 | // setup a timer so gdb can break in via ctrl-c\r |
969eba7b | 663 | DebugAgentTimerIntialize ();\r |
664 | \r | |
969eba7b | 665 | if (IrqEnabled) {\r |
666 | ArmEnableInterrupts ();\r | |
667 | }\r | |
668 | \r | |
685f8c76 | 669 | if (Function != NULL) {\r |
670 | Function (Context);\r | |
671 | }\r | |
672 | \r | |
969eba7b | 673 | return;\r |
674 | }\r | |
675 | \r |