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1 | /** @file\r |
2 | Processor specific parts of the GDB stub\r | |
3 | \r | |
4 | Copyright (c) 2008-2009, 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 | /** @file\r | |
16 | \r | |
17 | Copyright (c) 2008, Apple, Inc \r | |
18 | All rights reserved. This program and the accompanying materials \r | |
19 | are licensed and made available under the terms and conditions of the BSD License \r | |
20 | which accompanies this distribution. The full text of the license may be found at \r | |
21 | http://opensource.org/licenses/bsd-license.php \r | |
22 | \r | |
23 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
24 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
25 | \r | |
26 | **/\r | |
27 | \r | |
28 | #include <GdbStubInternal.h>\r | |
29 | #include <Library/CacheMaintenanceLib.h>\r | |
30 | #include <Library/PrintLib.h>\r | |
31 | \r | |
32 | //\r | |
33 | // Array of exception types that need to be hooked by the debugger\r | |
34 | // (efi, gdb) //efi number\r | |
35 | //\r | |
36 | EFI_EXCEPTION_TYPE_ENTRY gExceptionType[] = {\r | |
37 | { EXCEPT_ARM_SOFTWARE_INTERRUPT, GDB_SIGTRAP }\r | |
38 | // { EXCEPT_ARM_UNDEFINED_INSTRUCTION, GDB_SIGTRAP }, \r | |
39 | // { EXCEPT_ARM_PREFETCH_ABORT, GDB_SIGTRAP }, \r | |
40 | // { EXCEPT_ARM_DATA_ABORT, GDB_SIGEMT }, \r | |
41 | // { EXCEPT_ARM_RESERVED, GDB_SIGILL } \r | |
42 | };\r | |
43 | \r | |
44 | // Shut up some annoying RVCT warnings\r | |
45 | #ifdef __CC_ARM\r | |
46 | #pragma diag_suppress 1296\r | |
47 | #endif\r | |
48 | \r | |
49 | UINTN gRegisterOffsets[] = {\r | |
50 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R0),\r | |
51 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R1),\r | |
52 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R2),\r | |
53 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R3),\r | |
54 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R4),\r | |
55 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R5),\r | |
56 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R6),\r | |
57 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R7),\r | |
58 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R8),\r | |
59 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R9),\r | |
60 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R10),\r | |
61 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R11),\r | |
62 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, R12),\r | |
63 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, SP),\r | |
64 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, LR),\r | |
65 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, PC),\r | |
66 | 0x00000F01, // f0\r | |
67 | 0x00000F02,\r | |
68 | 0x00000F03,\r | |
69 | 0x00000F11, // f1\r | |
70 | 0x00000F12,\r | |
71 | 0x00000F13,\r | |
72 | 0x00000F21, // f2\r | |
73 | 0x00000F22,\r | |
74 | 0x00000F23,\r | |
75 | 0x00000F31, // f3\r | |
76 | 0x00000F32,\r | |
77 | 0x00000F33,\r | |
78 | 0x00000F41, // f4\r | |
79 | 0x00000F42,\r | |
80 | 0x00000F43,\r | |
81 | 0x00000F51, // f5\r | |
82 | 0x00000F52,\r | |
83 | 0x00000F53,\r | |
84 | 0x00000F61, // f6\r | |
85 | 0x00000F62,\r | |
86 | 0x00000F63,\r | |
87 | 0x00000F71, // f7\r | |
88 | 0x00000F72,\r | |
89 | 0x00000F73,\r | |
90 | 0x00000FFF, // fps\r | |
91 | 0x00000FFF, \r | |
92 | 0x00000FFF, \r | |
93 | OFFSET_OF(EFI_SYSTEM_CONTEXT_ARM, CPSR)\r | |
94 | };\r | |
95 | \r | |
96 | // restore warnings for RVCT\r | |
97 | #ifdef __CC_ARM\r | |
98 | #pragma diag_default 1296\r | |
99 | #endif\r | |
100 | \r | |
101 | /**\r | |
102 | Return the number of entries in the gExceptionType[]\r | |
103 | \r | |
104 | @retval UINTN, the number of entries in the gExceptionType[] array. \r | |
105 | **/\r | |
106 | UINTN\r | |
107 | MaxEfiException (\r | |
108 | VOID\r | |
109 | )\r | |
110 | {\r | |
111 | return sizeof (gExceptionType)/sizeof (EFI_EXCEPTION_TYPE_ENTRY);\r | |
112 | }\r | |
113 | \r | |
114 | \r | |
115 | /**\r | |
116 | Return the number of entries in the gRegisters[]\r | |
117 | \r | |
118 | @retval UINTN, the number of entries (registers) in the gRegisters[] array. \r | |
119 | **/\r | |
120 | UINTN\r | |
121 | MaxRegisterCount (\r | |
122 | VOID\r | |
123 | )\r | |
124 | {\r | |
125 | return sizeof (gRegisterOffsets)/sizeof (UINTN);\r | |
126 | }\r | |
127 | \r | |
128 | \r | |
129 | /**\r | |
130 | Check to see if the ISA is supported. \r | |
131 | ISA = Instruction Set Architecture\r | |
132 | \r | |
133 | @retval TRUE if Isa is supported \r | |
134 | \r | |
135 | **/\r | |
136 | BOOLEAN\r | |
137 | CheckIsa (\r | |
138 | IN EFI_INSTRUCTION_SET_ARCHITECTURE Isa\r | |
139 | )\r | |
140 | {\r | |
141 | if (Isa == IsaArm) {\r | |
142 | return TRUE;\r | |
143 | } else {\r | |
144 | return FALSE;\r | |
145 | }\r | |
146 | }\r | |
147 | \r | |
148 | \r | |
149 | /**\r | |
150 | This takes in the register number and the System Context, and returns a pointer to the RegNumber-th register in gdb ordering\r | |
151 | It is, by default, set to find the register pointer of the ARM member\r | |
152 | @param SystemContext Register content at time of the exception \r | |
153 | @param RegNumber The register to which we want to find a pointer\r | |
154 | @retval the pointer to the RegNumber-th pointer\r | |
155 | **/ \r | |
156 | UINTN *\r | |
157 | FindPointerToRegister(\r | |
158 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
159 | IN UINTN RegNumber \r | |
160 | )\r | |
161 | {\r | |
162 | UINT8 *TempPtr;\r | |
163 | ASSERT(gRegisterOffsets[RegNumber] < 0xF00);\r | |
164 | TempPtr = ((UINT8 *)SystemContext.SystemContextArm) + gRegisterOffsets[RegNumber];\r | |
165 | return (UINT32 *)TempPtr;\r | |
166 | }\r | |
167 | \r | |
168 | \r | |
169 | /**\r | |
170 | Adds the RegNumber-th register's value to the output buffer, starting at the given OutBufPtr\r | |
171 | @param SystemContext Register content at time of the exception\r | |
172 | @param RegNumber the number of the register that we want to read\r | |
173 | @param OutBufPtr pointer to the output buffer's end. the new data will be added from this point on.\r | |
174 | @retval the pointer to the next character of the output buffer that is available to be written on.\r | |
175 | **/\r | |
176 | CHAR8 *\r | |
177 | BasicReadRegister (\r | |
178 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
179 | IN UINTN RegNumber,\r | |
180 | IN CHAR8 *OutBufPtr\r | |
181 | )\r | |
182 | {\r | |
183 | UINTN RegSize;\r | |
184 | CHAR8 Char;\r | |
185 | \r | |
186 | if (gRegisterOffsets[RegNumber] > 0xF00) {\r | |
187 | AsciiSPrint(OutBufPtr, 9, "00000000");\r | |
188 | OutBufPtr += 8;\r | |
189 | return OutBufPtr;\r | |
190 | }\r | |
191 | \r | |
192 | RegSize = 0;\r | |
193 | while (RegSize < 32) {\r | |
194 | Char = mHexToStr[(UINT8)((*FindPointerToRegister(SystemContext, RegNumber) >> (RegSize+4)) & 0xf)];\r | |
195 | if ((Char >= 'A') && (Char <= 'F')) {\r | |
196 | Char = Char - 'A' + 'a';\r | |
197 | }\r | |
198 | *OutBufPtr++ = Char;\r | |
199 | \r | |
200 | Char = mHexToStr[(UINT8)((*FindPointerToRegister(SystemContext, RegNumber) >> RegSize) & 0xf)];\r | |
201 | if ((Char >= 'A') && (Char <= 'F')) {\r | |
202 | Char = Char - 'A' + 'a';\r | |
203 | }\r | |
204 | *OutBufPtr++ = Char;\r | |
205 | \r | |
206 | RegSize = RegSize + 8;\r | |
207 | }\r | |
208 | return OutBufPtr;\r | |
209 | }\r | |
210 | \r | |
211 | \r | |
212 | /** ‘p n’ \r | |
213 | Reads the n-th register's value into an output buffer and sends it as a packet \r | |
214 | @param SystemContext Register content at time of the exception\r | |
215 | @param InBuffer Pointer to the input buffer received from gdb server\r | |
216 | **/\r | |
217 | VOID\r | |
218 | ReadNthRegister (\r | |
219 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
220 | IN CHAR8 *InBuffer\r | |
221 | )\r | |
222 | {\r | |
223 | UINTN RegNumber;\r | |
224 | CHAR8 OutBuffer[9]; // 1 reg=8 hex chars, and the end '\0' (escape seq)\r | |
225 | CHAR8 *OutBufPtr; // pointer to the output buffer\r | |
226 | \r | |
227 | RegNumber = AsciiStrHexToUintn (&InBuffer[1]);\r | |
228 | \r | |
229 | if (RegNumber >= MaxRegisterCount()) {\r | |
230 | SendError (GDB_EINVALIDREGNUM); \r | |
231 | return;\r | |
232 | }\r | |
233 | \r | |
234 | OutBufPtr = OutBuffer;\r | |
235 | OutBufPtr = BasicReadRegister (SystemContext, RegNumber, OutBufPtr);\r | |
236 | \r | |
237 | *OutBufPtr = '\0'; // the end of the buffer\r | |
238 | SendPacket(OutBuffer);\r | |
239 | }\r | |
240 | \r | |
241 | \r | |
242 | /** ‘g’ \r | |
243 | Reads the general registers into an output buffer and sends it as a packet \r | |
244 | @param SystemContext Register content at time of the exception\r | |
245 | **/\r | |
246 | VOID\r | |
247 | EFIAPI\r | |
248 | ReadGeneralRegisters ( \r | |
249 | IN EFI_SYSTEM_CONTEXT SystemContext\r | |
250 | )\r | |
251 | {\r | |
252 | UINTN Index;\r | |
253 | CHAR8 *OutBuffer;\r | |
254 | CHAR8 *OutBufPtr;\r | |
255 | UINTN RegisterCount = MaxRegisterCount();\r | |
256 | \r | |
257 | // It is not safe to allocate pool here....\r | |
258 | OutBuffer = AllocatePool((RegisterCount * 8) + 1); // 8 bytes per register in string format plus a null to terminate\r | |
259 | OutBufPtr = OutBuffer;\r | |
260 | for (Index = 0; Index < RegisterCount; Index++) {\r | |
261 | OutBufPtr = BasicReadRegister (SystemContext, Index, OutBufPtr);\r | |
262 | }\r | |
263 | \r | |
264 | *OutBufPtr = '\0';\r | |
265 | SendPacket(OutBuffer);\r | |
266 | FreePool(OutBuffer);\r | |
267 | }\r | |
268 | \r | |
269 | \r | |
270 | /**\r | |
271 | Adds the RegNumber-th register's value to the output buffer, starting at the given OutBufPtr\r | |
272 | @param SystemContext Register content at time of the exception\r | |
273 | @param RegNumber the number of the register that we want to write\r | |
274 | @param InBufPtr pointer to the output buffer. the new data will be extracted from the input buffer from this point on.\r | |
275 | @retval the pointer to the next character of the input buffer that can be used\r | |
276 | **/\r | |
277 | CHAR8\r | |
278 | *BasicWriteRegister (\r | |
279 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
280 | IN UINTN RegNumber,\r | |
281 | IN CHAR8 *InBufPtr\r | |
282 | )\r | |
283 | {\r | |
284 | UINTN RegSize;\r | |
285 | UINTN TempValue; // the value transferred from a hex char\r | |
286 | UINT32 NewValue; // the new value of the RegNumber-th Register\r | |
287 | \r | |
288 | if (gRegisterOffsets[RegNumber] > 0xF00) {\r | |
289 | return InBufPtr + 8;\r | |
290 | }\r | |
291 | \r | |
292 | NewValue = 0;\r | |
293 | RegSize = 0;\r | |
294 | while (RegSize < 32) {\r | |
295 | TempValue = HexCharToInt(*InBufPtr++);\r | |
296 | \r | |
297 | if ((INTN)TempValue < 0) {\r | |
298 | SendError (GDB_EBADMEMDATA); \r | |
299 | return NULL;\r | |
300 | }\r | |
301 | \r | |
302 | NewValue += (TempValue << (RegSize+4));\r | |
303 | TempValue = HexCharToInt(*InBufPtr++);\r | |
304 | \r | |
305 | if ((INTN)TempValue < 0) {\r | |
306 | SendError (GDB_EBADMEMDATA); \r | |
307 | return NULL;\r | |
308 | }\r | |
309 | \r | |
310 | NewValue += (TempValue << RegSize); \r | |
311 | RegSize = RegSize + 8;\r | |
312 | }\r | |
313 | *(FindPointerToRegister(SystemContext, RegNumber)) = NewValue;\r | |
314 | return InBufPtr;\r | |
315 | }\r | |
316 | \r | |
317 | \r | |
318 | /** ‘P n...=r...’\r | |
319 | Writes the new value of n-th register received into the input buffer to the n-th register\r | |
320 | @param SystemContext Register content at time of the exception\r | |
321 | @param InBuffer Ponter to the input buffer received from gdb server\r | |
322 | **/\r | |
323 | VOID\r | |
324 | WriteNthRegister (\r | |
325 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
326 | IN CHAR8 *InBuffer\r | |
327 | )\r | |
328 | {\r | |
329 | UINTN RegNumber;\r | |
330 | CHAR8 RegNumBuffer[MAX_REG_NUM_BUF_SIZE]; // put the 'n..' part of the message into this array\r | |
331 | CHAR8 *RegNumBufPtr;\r | |
332 | CHAR8 *InBufPtr; // pointer to the input buffer\r | |
333 | \r | |
334 | // find the register number to write\r | |
335 | InBufPtr = &InBuffer[1];\r | |
336 | RegNumBufPtr = RegNumBuffer;\r | |
337 | while (*InBufPtr != '=') {\r | |
338 | *RegNumBufPtr++ = *InBufPtr++;\r | |
339 | } \r | |
340 | *RegNumBufPtr = '\0';\r | |
341 | RegNumber = AsciiStrHexToUintn (RegNumBuffer); \r | |
342 | \r | |
343 | // check if this is a valid Register Number\r | |
344 | if (RegNumber >= MaxRegisterCount()) {\r | |
345 | SendError (GDB_EINVALIDREGNUM); \r | |
346 | return;\r | |
347 | }\r | |
348 | InBufPtr++; // skips the '=' character\r | |
349 | BasicWriteRegister (SystemContext, RegNumber, InBufPtr);\r | |
350 | SendSuccess();\r | |
351 | }\r | |
352 | \r | |
353 | \r | |
354 | /** ‘G XX...’\r | |
355 | Writes the new values received into the input buffer to the general registers\r | |
356 | @param SystemContext Register content at time of the exception\r | |
357 | @param InBuffer Pointer to the input buffer received from gdb server\r | |
358 | **/\r | |
359 | \r | |
360 | VOID\r | |
361 | EFIAPI\r | |
362 | WriteGeneralRegisters (\r | |
363 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
364 | IN CHAR8 *InBuffer\r | |
365 | )\r | |
366 | {\r | |
367 | UINTN i;\r | |
368 | CHAR8 *InBufPtr; /// pointer to the input buffer\r | |
369 | UINTN MinLength;\r | |
370 | UINTN RegisterCount = MaxRegisterCount();\r | |
371 | \r | |
372 | MinLength = (RegisterCount * 8) + 1; // 'G' plus the registers in ASCII format\r | |
373 | \r | |
374 | if (AsciiStrLen(InBuffer) < MinLength) {\r | |
375 | //Bad message. Message is not the right length \r | |
376 | SendError (GDB_EBADBUFSIZE); \r | |
377 | return;\r | |
378 | }\r | |
379 | \r | |
380 | InBufPtr = &InBuffer[1];\r | |
381 | \r | |
382 | // Read the new values for the registers from the input buffer to an array, NewValueArray.\r | |
383 | // The values in the array are in the gdb ordering\r | |
384 | for(i = 0; i < RegisterCount; i++) {\r | |
385 | InBufPtr = BasicWriteRegister (SystemContext, i, InBufPtr);\r | |
386 | }\r | |
387 | \r | |
388 | SendSuccess ();\r | |
389 | }\r | |
390 | \r | |
391 | // What about Thumb?\r | |
392 | // Use SWI 0xdbdbdb as the debug instruction\r | |
393 | #define GDB_ARM_BKPT 0xefdbdbdb\r | |
394 | \r | |
395 | BOOLEAN mSingleStepActive = FALSE;\r | |
396 | UINT32 mSingleStepPC;\r | |
397 | UINT32 mSingleStepData;\r | |
398 | UINTN mSingleStepDataSize;\r | |
399 | \r | |
400 | typedef struct {\r | |
401 | LIST_ENTRY Link;\r | |
402 | UINT64 Signature;\r | |
403 | UINT32 Address;\r | |
404 | UINT32 Instruction;\r | |
405 | } ARM_SOFTWARE_BREAKPOINT;\r | |
406 | \r | |
407 | #define ARM_SOFTWARE_BREAKPOINT_SIGNATURE SIGNATURE_64('A', 'R', 'M', 'B', 'R', 'K', 'P', 'T')\r | |
408 | #define ARM_SOFTWARE_BREAKPOINT_FROM_LINK(a) CR(a, ARM_SOFTWARE_BREAKPOINT, Link, ARM_SOFTWARE_BREAKPOINT_SIGNATURE)\r | |
409 | \r | |
410 | LIST_ENTRY BreakpointList;\r | |
411 | \r | |
412 | /** \r | |
413 | Insert Single Step in the SystemContext\r | |
414 | \r | |
415 | @param SystemContext Register content at time of the exception\r | |
416 | **/\r | |
417 | VOID\r | |
418 | AddSingleStep (\r | |
419 | IN EFI_SYSTEM_CONTEXT SystemContext\r | |
420 | )\r | |
421 | {\r | |
422 | if (mSingleStepActive) {\r | |
423 | // Currently don't support nesting\r | |
424 | return;\r | |
425 | }\r | |
426 | mSingleStepActive = TRUE;\r | |
427 | \r | |
428 | mSingleStepPC = SystemContext.SystemContextArm->PC;\r | |
429 | \r | |
430 | mSingleStepDataSize = sizeof (UINT32);\r | |
431 | mSingleStepData = (*(UINT32 *)mSingleStepPC); \r | |
432 | *(UINT32 *)mSingleStepPC = GDB_ARM_BKPT;\r | |
433 | if (*(UINT32 *)mSingleStepPC != GDB_ARM_BKPT) {\r | |
434 | // For some reason our breakpoint did not take\r | |
435 | mSingleStepActive = FALSE;\r | |
436 | }\r | |
437 | \r | |
438 | InvalidateInstructionCacheRange((VOID *)mSingleStepPC, mSingleStepDataSize);\r | |
439 | //DEBUG((EFI_D_ERROR, "AddSingleStep at 0x%08x (was: 0x%08x is:0x%08x)\n", SystemContext.SystemContextArm->PC, mSingleStepData, *(UINT32 *)mSingleStepPC));\r | |
440 | }\r | |
441 | \r | |
442 | \r | |
443 | /** \r | |
444 | Remove Single Step in the SystemContext\r | |
445 | \r | |
446 | @param SystemContext Register content at time of the exception\r | |
447 | **/\r | |
448 | VOID\r | |
449 | RemoveSingleStep (\r | |
450 | IN EFI_SYSTEM_CONTEXT SystemContext\r | |
451 | )\r | |
452 | {\r | |
453 | if (!mSingleStepActive) {\r | |
454 | return;\r | |
455 | }\r | |
456 | \r | |
457 | if (mSingleStepDataSize == sizeof (UINT16)) {\r | |
458 | *(UINT16 *)mSingleStepPC = (UINT16)mSingleStepData;\r | |
459 | } else {\r | |
460 | //DEBUG((EFI_D_ERROR, "RemoveSingleStep at 0x%08x (was: 0x%08x is:0x%08x)\n", SystemContext.SystemContextArm->PC, *(UINT32 *)mSingleStepPC, mSingleStepData));\r | |
461 | *(UINT32 *)mSingleStepPC = mSingleStepData;\r | |
462 | }\r | |
463 | InvalidateInstructionCacheRange((VOID *)mSingleStepPC, mSingleStepDataSize);\r | |
464 | mSingleStepActive = FALSE;\r | |
465 | }\r | |
466 | \r | |
467 | \r | |
468 | \r | |
469 | /** ‘c [addr ]’ \r | |
470 | Continue. addr is Address to resume. If addr is omitted, resume at current \r | |
471 | Address.\r | |
472 | \r | |
473 | @param SystemContext Register content at time of the exception \r | |
474 | **/\r | |
475 | VOID\r | |
476 | EFIAPI\r | |
477 | ContinueAtAddress (\r | |
478 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
479 | IN CHAR8 *PacketData\r | |
480 | )\r | |
481 | {\r | |
482 | if (PacketData[1] != '\0') {\r | |
483 | SystemContext.SystemContextArm->PC = AsciiStrHexToUintn(&PacketData[1]);\r | |
484 | } \r | |
485 | }\r | |
486 | \r | |
487 | \r | |
488 | /** ‘s [addr ]’\r | |
489 | Single step. addr is the Address at which to resume. If addr is omitted, resume \r | |
490 | at same Address.\r | |
491 | \r | |
492 | @param SystemContext Register content at time of the exception \r | |
493 | **/\r | |
494 | VOID\r | |
495 | EFIAPI\r | |
496 | SingleStep (\r | |
497 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
498 | IN CHAR8 *PacketData\r | |
499 | )\r | |
500 | {\r | |
501 | SendNotSupported();\r | |
502 | }\r | |
503 | \r | |
504 | UINTN\r | |
505 | GetBreakpointDataAddress (\r | |
506 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
507 | IN UINTN BreakpointNumber\r | |
508 | )\r | |
509 | {\r | |
510 | return 0;\r | |
511 | }\r | |
512 | \r | |
513 | UINTN\r | |
514 | GetBreakpointDetected (\r | |
515 | IN EFI_SYSTEM_CONTEXT SystemContext\r | |
516 | )\r | |
517 | {\r | |
518 | return 0;\r | |
519 | }\r | |
520 | \r | |
521 | BREAK_TYPE\r | |
522 | GetBreakpointType (\r | |
523 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
524 | IN UINTN BreakpointNumber\r | |
525 | )\r | |
526 | {\r | |
527 | return NotSupported;\r | |
528 | }\r | |
529 | \r | |
530 | ARM_SOFTWARE_BREAKPOINT *\r | |
531 | SearchBreakpointList (\r | |
532 | IN UINT32 Address\r | |
533 | )\r | |
534 | {\r | |
535 | LIST_ENTRY *Current;\r | |
536 | ARM_SOFTWARE_BREAKPOINT *Breakpoint;\r | |
537 | \r | |
538 | Current = GetFirstNode(&BreakpointList);\r | |
539 | while (!IsNull(&BreakpointList, Current)) {\r | |
540 | Breakpoint = ARM_SOFTWARE_BREAKPOINT_FROM_LINK(Current);\r | |
541 | \r | |
542 | if (Address == Breakpoint->Address) {\r | |
543 | return Breakpoint;\r | |
544 | }\r | |
545 | \r | |
546 | Current = GetNextNode(&BreakpointList, Current);\r | |
547 | }\r | |
548 | \r | |
549 | return NULL;\r | |
550 | }\r | |
551 | \r | |
552 | VOID\r | |
553 | SetBreakpoint (\r | |
554 | IN UINT32 Address\r | |
555 | )\r | |
556 | {\r | |
557 | ARM_SOFTWARE_BREAKPOINT *Breakpoint;\r | |
558 | \r | |
559 | Breakpoint = SearchBreakpointList(Address);\r | |
560 | \r | |
561 | if (Breakpoint != NULL) {\r | |
562 | return;\r | |
563 | }\r | |
564 | \r | |
565 | // create and fill breakpoint structure\r | |
566 | Breakpoint = AllocatePool(sizeof(ARM_SOFTWARE_BREAKPOINT));\r | |
567 | \r | |
568 | Breakpoint->Signature = ARM_SOFTWARE_BREAKPOINT_SIGNATURE;\r | |
569 | Breakpoint->Address = Address;\r | |
570 | Breakpoint->Instruction = *(UINT32 *)Address;\r | |
571 | \r | |
572 | // Add it to the list\r | |
573 | InsertTailList(&BreakpointList, &Breakpoint->Link);\r | |
574 | \r | |
575 | // Insert the software breakpoint\r | |
576 | *(UINT32 *)Address = GDB_ARM_BKPT;\r | |
577 | InvalidateInstructionCacheRange((VOID *)Address, 4);\r | |
578 | \r | |
579 | //DEBUG((EFI_D_ERROR, "SetBreakpoint at 0x%08x (was: 0x%08x is:0x%08x)\n", Address, Breakpoint->Instruction, *(UINT32 *)Address));\r | |
580 | }\r | |
581 | \r | |
582 | VOID\r | |
583 | ClearBreakpoint (\r | |
584 | IN UINT32 Address\r | |
585 | )\r | |
586 | {\r | |
587 | ARM_SOFTWARE_BREAKPOINT *Breakpoint;\r | |
588 | \r | |
589 | Breakpoint = SearchBreakpointList(Address);\r | |
590 | \r | |
591 | if (Breakpoint == NULL) {\r | |
592 | return;\r | |
593 | }\r | |
594 | \r | |
595 | // Add it to the list\r | |
596 | RemoveEntryList(&Breakpoint->Link);\r | |
597 | \r | |
598 | // Restore the original instruction\r | |
599 | *(UINT32 *)Address = Breakpoint->Instruction;\r | |
600 | InvalidateInstructionCacheRange((VOID *)Address, 4);\r | |
601 | \r | |
602 | //DEBUG((EFI_D_ERROR, "ClearBreakpoint at 0x%08x (was: 0x%08x is:0x%08x)\n", Address, GDB_ARM_BKPT, *(UINT32 *)Address));\r | |
603 | \r | |
604 | FreePool(Breakpoint);\r | |
605 | }\r | |
606 | \r | |
607 | VOID\r | |
608 | EFIAPI\r | |
609 | InsertBreakPoint (\r | |
610 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
611 | IN CHAR8 *PacketData\r | |
612 | )\r | |
613 | {\r | |
614 | UINTN Type;\r | |
615 | UINTN Address;\r | |
616 | UINTN Length;\r | |
617 | UINTN ErrorCode;\r | |
618 | \r | |
619 | ErrorCode = ParseBreakpointPacket(PacketData, &Type, &Address, &Length);\r | |
620 | if (ErrorCode > 0) {\r | |
621 | SendError ((UINT8)ErrorCode);\r | |
622 | return;\r | |
623 | }\r | |
624 | \r | |
625 | switch (Type) {\r | |
626 | case 0: //Software breakpoint\r | |
627 | break;\r | |
628 | \r | |
629 | default :\r | |
630 | DEBUG((EFI_D_ERROR, "Insert breakpoint default: %x\n", Type));\r | |
631 | SendError (GDB_EINVALIDBRKPOINTTYPE);\r | |
632 | return;\r | |
633 | }\r | |
634 | \r | |
635 | SetBreakpoint(Address);\r | |
636 | \r | |
637 | SendSuccess ();\r | |
638 | }\r | |
639 | \r | |
640 | VOID\r | |
641 | EFIAPI\r | |
642 | RemoveBreakPoint (\r | |
643 | IN EFI_SYSTEM_CONTEXT SystemContext,\r | |
644 | IN CHAR8 *PacketData\r | |
645 | )\r | |
646 | {\r | |
647 | UINTN Type;\r | |
648 | UINTN Address;\r | |
649 | UINTN Length;\r | |
650 | UINTN ErrorCode;\r | |
651 | \r | |
652 | //Parse breakpoint packet data\r | |
653 | ErrorCode = ParseBreakpointPacket (PacketData, &Type, &Address, &Length);\r | |
654 | if (ErrorCode > 0) {\r | |
655 | SendError ((UINT8)ErrorCode);\r | |
656 | return;\r | |
657 | }\r | |
658 | \r | |
659 | switch (Type) {\r | |
660 | case 0: //Software breakpoint\r | |
661 | break;\r | |
662 | \r | |
663 | default:\r | |
664 | SendError (GDB_EINVALIDBRKPOINTTYPE);\r | |
665 | return;\r | |
666 | }\r | |
667 | \r | |
668 | ClearBreakpoint(Address);\r | |
669 | \r | |
670 | SendSuccess ();\r | |
671 | }\r | |
672 | \r | |
673 | VOID\r | |
674 | InitializeProcessor (\r | |
675 | VOID\r | |
676 | )\r | |
677 | {\r | |
678 | // Initialize breakpoint list\r | |
679 | InitializeListHead(&BreakpointList);\r | |
680 | }\r | |
681 | \r | |
682 | BOOLEAN\r | |
683 | ValidateAddress (\r | |
684 | IN VOID *Address\r | |
685 | )\r | |
686 | {\r | |
687 | if ((UINT32)Address < 0x80000000) {\r | |
688 | return FALSE;\r | |
689 | } else {\r | |
690 | return TRUE;\r | |
691 | }\r | |
692 | }\r | |
693 | \r | |
694 | BOOLEAN\r | |
695 | ValidateException (\r | |
696 | IN EFI_EXCEPTION_TYPE ExceptionType, \r | |
697 | IN OUT EFI_SYSTEM_CONTEXT SystemContext \r | |
698 | )\r | |
699 | {\r | |
700 | UINT32 ExceptionAddress;\r | |
701 | UINT32 Instruction;\r | |
702 | \r | |
703 | // Is it a debugger SWI?\r | |
704 | ExceptionAddress = SystemContext.SystemContextArm->PC -= 4;\r | |
705 | Instruction = *(UINT32 *)ExceptionAddress;\r | |
706 | if (Instruction != GDB_ARM_BKPT) {\r | |
707 | return FALSE;\r | |
708 | }\r | |
709 | \r | |
710 | // Special for SWI-based exception handling. SWI sets up the context\r | |
711 | // to return to the instruction following the SWI instruction - NOT what we want\r | |
712 | // for a debugger!\r | |
713 | SystemContext.SystemContextArm->PC = ExceptionAddress;\r | |
714 | \r | |
715 | return TRUE;\r | |
716 | }\r | |
717 | \r |