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fb0b259e | 1 | /** @file\r |
53c71d09 | 2 | This module contains EBC support routines that are customized based on\r |
3 | the target x64 processor.\r | |
4 | \r | |
fb0b259e | 5 | Copyright (c) 2006, Intel Corporation\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 | |
53c71d09 | 15 | \r |
16 | #include "EbcInt.h"\r | |
17 | #include "EbcExecute.h"\r | |
18 | \r | |
19 | //\r | |
20 | // NOTE: This is the stack size allocated for the interpreter\r | |
21 | // when it executes an EBC image. The requirements can change\r | |
22 | // based on whether or not a debugger is present, and other\r | |
23 | // platform-specific configurations.\r | |
24 | //\r | |
25 | #define VM_STACK_SIZE (1024 * 8)\r | |
26 | #define EBC_THUNK_SIZE 64\r | |
27 | \r | |
28 | #define STACK_REMAIN_SIZE (1024 * 4)\r | |
29 | \r | |
30 | STATIC\r | |
31 | VOID\r | |
32 | PushU64 (\r | |
33 | VM_CONTEXT *VmPtr,\r | |
34 | UINT64 Arg\r | |
35 | )\r | |
36 | /*++\r | |
37 | \r | |
38 | Routine Description:\r | |
39 | \r | |
40 | Push a 64 bit unsigned value to the VM stack.\r | |
fb0b259e | 41 | \r |
53c71d09 | 42 | Arguments:\r |
43 | \r | |
44 | VmPtr - The pointer to current VM context.\r | |
45 | Arg - The value to be pushed\r | |
46 | \r | |
47 | Returns:\r | |
48 | \r | |
49 | VOID\r | |
fb0b259e | 50 | \r |
53c71d09 | 51 | --*/\r |
52 | {\r | |
53 | //\r | |
54 | // Advance the VM stack down, and then copy the argument to the stack.\r | |
55 | // Hope it's aligned.\r | |
56 | //\r | |
57 | VmPtr->R[0] -= sizeof (UINT64);\r | |
58 | *(UINT64 *) VmPtr->R[0] = Arg;\r | |
59 | return;\r | |
60 | }\r | |
61 | \r | |
fb0b259e | 62 | \r |
63 | /**\r | |
64 | Begin executing an EBC image. The address of the entry point is passed\r | |
65 | in via a processor register, so we'll need to make a call to get the\r | |
66 | value.\r | |
67 | \r | |
68 | This is a thunk function. Microsoft x64 compiler only provide fast_call\r | |
69 | calling convention, so the first four arguments are passed by rcx, rdx,\r | |
70 | r8, and r9, while other arguments are passed in stack.\r | |
71 | \r | |
72 | @return The value returned by the EBC application we're going to run.\r | |
73 | \r | |
74 | **/\r | |
53c71d09 | 75 | STATIC\r |
76 | UINT64\r | |
77 | EbcInterpret (\r | |
78 | UINTN Arg1,\r | |
79 | UINTN Arg2,\r | |
80 | UINTN Arg3,\r | |
81 | UINTN Arg4,\r | |
82 | UINTN Arg5,\r | |
83 | UINTN Arg6,\r | |
84 | UINTN Arg7,\r | |
85 | UINTN Arg8,\r | |
86 | UINTN Arg9,\r | |
87 | UINTN Arg10,\r | |
88 | UINTN Arg11,\r | |
89 | UINTN Arg12,\r | |
90 | UINTN Arg13,\r | |
91 | UINTN Arg14,\r | |
92 | UINTN Arg15,\r | |
93 | UINTN Arg16\r | |
94 | )\r | |
53c71d09 | 95 | {\r |
96 | //\r | |
97 | // Create a new VM context on the stack\r | |
98 | //\r | |
99 | VM_CONTEXT VmContext;\r | |
100 | UINTN Addr;\r | |
101 | EFI_STATUS Status;\r | |
102 | UINTN StackIndex;\r | |
103 | \r | |
104 | //\r | |
105 | // Get the EBC entry point from the processor register.\r | |
106 | // Don't call any function before getting the EBC entry\r | |
107 | // point because this will collab the return register.\r | |
108 | //\r | |
109 | Addr = EbcLLGetEbcEntryPoint ();\r | |
110 | \r | |
111 | //\r | |
112 | // Now clear out our context\r | |
113 | //\r | |
114 | ZeroMem ((VOID *) &VmContext, sizeof (VM_CONTEXT));\r | |
115 | \r | |
116 | //\r | |
117 | // Set the VM instruction pointer to the correct location in memory.\r | |
118 | //\r | |
119 | VmContext.Ip = (VMIP) Addr;\r | |
120 | \r | |
121 | //\r | |
122 | // Initialize the stack pointer for the EBC. Get the current system stack\r | |
123 | // pointer and adjust it down by the max needed for the interpreter.\r | |
124 | //\r | |
125 | Addr = EbcLLGetStackPointer ();\r | |
126 | \r | |
127 | //\r | |
128 | // Adjust the VM's stack pointer down.\r | |
129 | //\r | |
fb0b259e | 130 | \r |
53c71d09 | 131 | Status = GetEBCStack((EFI_HANDLE)(UINTN)-1, &VmContext.StackPool, &StackIndex);\r |
132 | if (EFI_ERROR(Status)) {\r | |
133 | return Status;\r | |
134 | }\r | |
135 | VmContext.StackTop = (UINT8*)VmContext.StackPool + (STACK_REMAIN_SIZE);\r | |
136 | VmContext.R[0] = (UINT64) ((UINT8*)VmContext.StackPool + STACK_POOL_SIZE);\r | |
137 | VmContext.HighStackBottom = (UINTN) VmContext.R[0];\r | |
138 | VmContext.R[0] -= sizeof (UINTN);\r | |
139 | \r | |
140 | //\r | |
141 | // Align the stack on a natural boundary.\r | |
142 | //\r | |
143 | VmContext.R[0] &= ~(sizeof (UINTN) - 1);\r | |
144 | \r | |
145 | //\r | |
146 | // Put a magic value in the stack gap, then adjust down again.\r | |
147 | //\r | |
148 | *(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) VM_STACK_KEY_VALUE;\r | |
149 | VmContext.StackMagicPtr = (UINTN *) (UINTN) VmContext.R[0];\r | |
150 | \r | |
151 | //\r | |
152 | // The stack upper to LowStackTop is belong to the VM.\r | |
153 | //\r | |
154 | VmContext.LowStackTop = (UINTN) VmContext.R[0];\r | |
155 | \r | |
156 | //\r | |
157 | // For the worst case, assume there are 4 arguments passed in registers, store\r | |
158 | // them to VM's stack.\r | |
159 | //\r | |
160 | PushU64 (&VmContext, (UINT64) Arg16);\r | |
161 | PushU64 (&VmContext, (UINT64) Arg15);\r | |
162 | PushU64 (&VmContext, (UINT64) Arg14);\r | |
163 | PushU64 (&VmContext, (UINT64) Arg13);\r | |
164 | PushU64 (&VmContext, (UINT64) Arg12);\r | |
165 | PushU64 (&VmContext, (UINT64) Arg11);\r | |
166 | PushU64 (&VmContext, (UINT64) Arg10);\r | |
167 | PushU64 (&VmContext, (UINT64) Arg9);\r | |
168 | PushU64 (&VmContext, (UINT64) Arg8);\r | |
169 | PushU64 (&VmContext, (UINT64) Arg7);\r | |
170 | PushU64 (&VmContext, (UINT64) Arg6);\r | |
171 | PushU64 (&VmContext, (UINT64) Arg5);\r | |
172 | PushU64 (&VmContext, (UINT64) Arg4);\r | |
173 | PushU64 (&VmContext, (UINT64) Arg3);\r | |
174 | PushU64 (&VmContext, (UINT64) Arg2);\r | |
175 | PushU64 (&VmContext, (UINT64) Arg1);\r | |
176 | \r | |
177 | //\r | |
178 | // Interpreter assumes 64-bit return address is pushed on the stack.\r | |
179 | // The x64 does not do this so pad the stack accordingly.\r | |
180 | //\r | |
181 | PushU64 (&VmContext, (UINT64) 0);\r | |
182 | PushU64 (&VmContext, (UINT64) 0x1234567887654321ULL);\r | |
183 | \r | |
184 | //\r | |
185 | // For x64, this is where we say our return address is\r | |
186 | //\r | |
187 | VmContext.StackRetAddr = (UINT64) VmContext.R[0];\r | |
188 | \r | |
189 | //\r | |
190 | // We need to keep track of where the EBC stack starts. This way, if the EBC\r | |
191 | // accesses any stack variables above its initial stack setting, then we know\r | |
192 | // it's accessing variables passed into it, which means the data is on the\r | |
193 | // VM's stack.\r | |
194 | // When we're called, on the stack (high to low) we have the parameters, the\r | |
195 | // return address, then the saved ebp. Save the pointer to the return address.\r | |
196 | // EBC code knows that's there, so should look above it for function parameters.\r | |
197 | // The offset is the size of locals (VMContext + Addr + saved ebp).\r | |
198 | // Note that the interpreter assumes there is a 16 bytes of return address on\r | |
199 | // the stack too, so adjust accordingly.\r | |
200 | // VmContext.HighStackBottom = (UINTN)(Addr + sizeof (VmContext) + sizeof (Addr));\r | |
201 | //\r | |
202 | \r | |
203 | //\r | |
204 | // Begin executing the EBC code\r | |
205 | //\r | |
206 | EbcExecute (&VmContext);\r | |
207 | \r | |
208 | //\r | |
209 | // Return the value in R[7] unless there was an error\r | |
210 | //\r | |
211 | ReturnEBCStack(StackIndex);\r | |
212 | return (UINT64) VmContext.R[7];\r | |
213 | }\r | |
214 | \r | |
53c71d09 | 215 | \r |
fb0b259e | 216 | /**\r |
53c71d09 | 217 | Begin executing an EBC image. The address of the entry point is passed\r |
218 | in via a processor register, so we'll need to make a call to get the\r | |
219 | value.\r | |
53c71d09 | 220 | \r |
fb0b259e | 221 | @param ImageHandle image handle for the EBC application we're executing\r |
222 | @param SystemTable standard system table passed into an driver's entry\r | |
223 | point\r | |
53c71d09 | 224 | \r |
fb0b259e | 225 | @return The value returned by the EBC application we're going to run.\r |
53c71d09 | 226 | \r |
fb0b259e | 227 | **/\r |
228 | STATIC\r | |
229 | UINT64\r | |
230 | ExecuteEbcImageEntryPoint (\r | |
231 | IN EFI_HANDLE ImageHandle,\r | |
232 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
233 | )\r | |
53c71d09 | 234 | {\r |
235 | //\r | |
236 | // Create a new VM context on the stack\r | |
237 | //\r | |
238 | VM_CONTEXT VmContext;\r | |
239 | UINTN Addr;\r | |
240 | EFI_STATUS Status;\r | |
241 | UINTN StackIndex;\r | |
242 | \r | |
243 | //\r | |
244 | // Get the EBC entry point from the processor register. Make sure you don't\r | |
245 | // call any functions before this or you could mess up the register the\r | |
246 | // entry point is passed in.\r | |
247 | //\r | |
248 | Addr = EbcLLGetEbcEntryPoint ();\r | |
249 | \r | |
250 | //\r | |
251 | // Now clear out our context\r | |
252 | //\r | |
253 | ZeroMem ((VOID *) &VmContext, sizeof (VM_CONTEXT));\r | |
254 | \r | |
255 | //\r | |
256 | // Save the image handle so we can track the thunks created for this image\r | |
257 | //\r | |
258 | VmContext.ImageHandle = ImageHandle;\r | |
259 | VmContext.SystemTable = SystemTable;\r | |
260 | \r | |
261 | //\r | |
262 | // Set the VM instruction pointer to the correct location in memory.\r | |
263 | //\r | |
264 | VmContext.Ip = (VMIP) Addr;\r | |
265 | \r | |
266 | //\r | |
267 | // Initialize the stack pointer for the EBC. Get the current system stack\r | |
268 | // pointer and adjust it down by the max needed for the interpreter.\r | |
269 | //\r | |
270 | Addr = EbcLLGetStackPointer ();\r | |
271 | \r | |
272 | Status = GetEBCStack(ImageHandle, &VmContext.StackPool, &StackIndex);\r | |
273 | if (EFI_ERROR(Status)) {\r | |
274 | return Status;\r | |
275 | }\r | |
276 | VmContext.StackTop = (UINT8*)VmContext.StackPool + (STACK_REMAIN_SIZE);\r | |
277 | VmContext.R[0] = (UINT64) ((UINT8*)VmContext.StackPool + STACK_POOL_SIZE);\r | |
278 | VmContext.HighStackBottom = (UINTN) VmContext.R[0];\r | |
279 | VmContext.R[0] -= sizeof (UINTN);\r | |
280 | \r | |
281 | \r | |
282 | //\r | |
283 | // Put a magic value in the stack gap, then adjust down again\r | |
284 | //\r | |
285 | *(UINTN *) (UINTN) (VmContext.R[0]) = (UINTN) VM_STACK_KEY_VALUE;\r | |
286 | VmContext.StackMagicPtr = (UINTN *) (UINTN) VmContext.R[0];\r | |
287 | \r | |
288 | //\r | |
289 | // Align the stack on a natural boundary\r | |
290 | VmContext.R[0] &= ~(sizeof(UINTN) - 1);\r | |
291 | //\r | |
292 | VmContext.LowStackTop = (UINTN) VmContext.R[0];\r | |
293 | \r | |
294 | //\r | |
295 | // Simply copy the image handle and system table onto the EBC stack.\r | |
296 | // Greatly simplifies things by not having to spill the args.\r | |
297 | //\r | |
298 | PushU64 (&VmContext, (UINT64) SystemTable);\r | |
299 | PushU64 (&VmContext, (UINT64) ImageHandle);\r | |
300 | \r | |
301 | //\r | |
302 | // VM pushes 16-bytes for return address. Simulate that here.\r | |
303 | //\r | |
304 | PushU64 (&VmContext, (UINT64) 0);\r | |
305 | PushU64 (&VmContext, (UINT64) 0x1234567887654321ULL);\r | |
306 | \r | |
307 | //\r | |
308 | // For x64, this is where we say our return address is\r | |
309 | //\r | |
310 | VmContext.StackRetAddr = (UINT64) VmContext.R[0];\r | |
311 | \r | |
312 | //\r | |
313 | // Entry function needn't access high stack context, simply\r | |
314 | // put the stack pointer here.\r | |
315 | //\r | |
316 | \r | |
317 | //\r | |
318 | // Begin executing the EBC code\r | |
319 | //\r | |
320 | EbcExecute (&VmContext);\r | |
321 | \r | |
322 | //\r | |
323 | // Return the value in R[7] unless there was an error\r | |
324 | //\r | |
325 | ReturnEBCStack(StackIndex);\r | |
326 | return (UINT64) VmContext.R[7];\r | |
327 | }\r | |
328 | \r | |
fb0b259e | 329 | \r |
330 | /**\r | |
331 | Create an IA32 thunk for the given EBC entry point.\r | |
332 | \r | |
333 | @param ImageHandle Handle of image for which this thunk is being created\r | |
334 | @param EbcEntryPoint Address of the EBC code that the thunk is to call\r | |
335 | @param Thunk Returned thunk we create here\r | |
336 | \r | |
337 | @return Standard EFI status.\r | |
338 | \r | |
339 | **/\r | |
53c71d09 | 340 | EFI_STATUS\r |
341 | EbcCreateThunks (\r | |
342 | IN EFI_HANDLE ImageHandle,\r | |
343 | IN VOID *EbcEntryPoint,\r | |
344 | OUT VOID **Thunk,\r | |
345 | IN UINT32 Flags\r | |
346 | )\r | |
53c71d09 | 347 | {\r |
348 | UINT8 *Ptr;\r | |
349 | UINT8 *ThunkBase;\r | |
350 | UINT32 I;\r | |
351 | UINT64 Addr;\r | |
352 | INT32 Size;\r | |
353 | INT32 ThunkSize;\r | |
354 | \r | |
355 | //\r | |
356 | // Check alignment of pointer to EBC code\r | |
357 | //\r | |
358 | if ((UINT32) (UINTN) EbcEntryPoint & 0x01) {\r | |
359 | return EFI_INVALID_PARAMETER;\r | |
360 | }\r | |
361 | \r | |
362 | Size = EBC_THUNK_SIZE;\r | |
363 | ThunkSize = Size;\r | |
364 | \r | |
365 | Ptr = AllocatePool (Size);\r | |
366 | \r | |
367 | if (Ptr == NULL) {\r | |
368 | return EFI_OUT_OF_RESOURCES;\r | |
369 | }\r | |
370 | //\r | |
371 | // Print(L"Allocate TH: 0x%X\n", (UINT32)Ptr);\r | |
372 | //\r | |
373 | // Save the start address so we can add a pointer to it to a list later.\r | |
374 | //\r | |
375 | ThunkBase = Ptr;\r | |
376 | \r | |
377 | //\r | |
378 | // Give them the address of our buffer we're going to fix up\r | |
379 | //\r | |
380 | *Thunk = (VOID *) Ptr;\r | |
381 | \r | |
382 | //\r | |
383 | // Add a magic code here to help the VM recognize the thunk..\r | |
384 | // mov rax, ca112ebccall2ebch => 48 B8 BC 2E 11 CA BC 2E 11 CA\r | |
385 | //\r | |
386 | *Ptr = 0x48;\r | |
387 | Ptr++;\r | |
388 | Size--;\r | |
389 | *Ptr = 0xB8;\r | |
390 | Ptr++;\r | |
391 | Size--;\r | |
392 | Addr = (UINT64) 0xCA112EBCCA112EBCULL;\r | |
393 | for (I = 0; I < sizeof (Addr); I++) {\r | |
394 | *Ptr = (UINT8) (UINTN) Addr;\r | |
395 | Addr >>= 8;\r | |
396 | Ptr++;\r | |
397 | Size--;\r | |
398 | }\r | |
399 | \r | |
400 | //\r | |
401 | // Add code bytes to load up a processor register with the EBC entry point.\r | |
402 | // mov rax, 123456789abcdef0h => 48 B8 F0 DE BC 9A 78 56 34 12\r | |
403 | // The first 8 bytes of the thunk entry is the address of the EBC\r | |
404 | // entry point.\r | |
405 | //\r | |
406 | *Ptr = 0x48;\r | |
407 | Ptr++;\r | |
408 | Size--;\r | |
409 | *Ptr = 0xB8;\r | |
410 | Ptr++;\r | |
411 | Size--;\r | |
412 | Addr = (UINT64) EbcEntryPoint;\r | |
413 | for (I = 0; I < sizeof (Addr); I++) {\r | |
414 | *Ptr = (UINT8) (UINTN) Addr;\r | |
415 | Addr >>= 8;\r | |
416 | Ptr++;\r | |
417 | Size--;\r | |
418 | }\r | |
419 | \r | |
420 | //\r | |
421 | // Stick in a load of ecx with the address of appropriate VM function.\r | |
422 | // Using r11 because it's a volatile register and won't be used in this\r | |
423 | // point.\r | |
424 | // mov r11 123456789abcdef0h => 49 BB F0 DE BC 9A 78 56 34 12\r | |
425 | //\r | |
426 | if (Flags & FLAG_THUNK_ENTRY_POINT) {\r | |
427 | Addr = (UINTN) ExecuteEbcImageEntryPoint;\r | |
428 | } else {\r | |
429 | Addr = (UINTN) EbcInterpret;\r | |
430 | }\r | |
431 | \r | |
432 | //\r | |
433 | // mov r11 Addr => 0x49 0xBB\r | |
434 | //\r | |
435 | *Ptr = 0x49;\r | |
436 | Ptr++;\r | |
437 | Size--;\r | |
438 | *Ptr = 0xBB;\r | |
439 | Ptr++;\r | |
440 | Size--;\r | |
441 | for (I = 0; I < sizeof (Addr); I++) {\r | |
442 | *Ptr = (UINT8) Addr;\r | |
443 | Addr >>= 8;\r | |
444 | Ptr++;\r | |
445 | Size--;\r | |
446 | }\r | |
447 | //\r | |
448 | // Stick in jump opcode bytes for jmp r11 => 0x41 0xFF 0xE3\r | |
449 | //\r | |
450 | *Ptr = 0x41;\r | |
451 | Ptr++;\r | |
452 | Size--;\r | |
453 | *Ptr = 0xFF;\r | |
454 | Ptr++;\r | |
455 | Size--;\r | |
456 | *Ptr = 0xE3;\r | |
457 | Size--;\r | |
458 | \r | |
459 | //\r | |
460 | // Double check that our defined size is ok (application error)\r | |
461 | //\r | |
462 | if (Size < 0) {\r | |
463 | ASSERT (FALSE);\r | |
464 | return EFI_BUFFER_TOO_SMALL;\r | |
465 | }\r | |
466 | //\r | |
467 | // Add the thunk to the list for this image. Do this last since the add\r | |
468 | // function flushes the cache for us.\r | |
469 | //\r | |
470 | EbcAddImageThunk (ImageHandle, (VOID *) ThunkBase, ThunkSize);\r | |
471 | \r | |
472 | return EFI_SUCCESS;\r | |
473 | }\r | |
474 | \r | |
53c71d09 | 475 | \r |
fb0b259e | 476 | /**\r |
477 | This function is called to execute an EBC CALLEX instruction.\r | |
53c71d09 | 478 | The function check the callee's content to see whether it is common native\r |
479 | code or a thunk to another piece of EBC code.\r | |
480 | If the callee is common native code, use EbcLLCAllEXASM to manipulate,\r | |
481 | otherwise, set the VM->IP to target EBC code directly to avoid another VM\r | |
482 | be startup which cost time and stack space.\r | |
53c71d09 | 483 | \r |
fb0b259e | 484 | @param VmPtr Pointer to a VM context.\r |
485 | @param FuncAddr Callee's address\r | |
486 | @param NewStackPointer New stack pointer after the call\r | |
487 | @param FramePtr New frame pointer after the call\r | |
488 | @param Size The size of call instruction\r | |
53c71d09 | 489 | \r |
fb0b259e | 490 | @return None.\r |
53c71d09 | 491 | \r |
fb0b259e | 492 | **/\r |
493 | VOID\r | |
494 | EbcLLCALLEX (\r | |
495 | IN VM_CONTEXT *VmPtr,\r | |
496 | IN UINTN FuncAddr,\r | |
497 | IN UINTN NewStackPointer,\r | |
498 | IN VOID *FramePtr,\r | |
499 | IN UINT8 Size\r | |
500 | )\r | |
53c71d09 | 501 | {\r |
502 | UINTN IsThunk;\r | |
503 | UINTN TargetEbcAddr;\r | |
504 | \r | |
505 | IsThunk = 1;\r | |
506 | TargetEbcAddr = 0;\r | |
507 | \r | |
508 | //\r | |
509 | // Processor specific code to check whether the callee is a thunk to EBC.\r | |
510 | //\r | |
511 | if (*((UINT8 *)FuncAddr) != 0x48) {\r | |
512 | IsThunk = 0;\r | |
513 | goto Action;\r | |
514 | }\r | |
515 | if (*((UINT8 *)FuncAddr + 1) != 0xB8) {\r | |
516 | IsThunk = 0;\r | |
517 | goto Action;\r | |
518 | }\r | |
519 | if (*((UINT8 *)FuncAddr + 2) != 0xBC) {\r | |
520 | IsThunk = 0;\r | |
521 | goto Action;\r | |
522 | }\r | |
523 | if (*((UINT8 *)FuncAddr + 3) != 0x2E) {\r | |
524 | IsThunk = 0;\r | |
525 | goto Action;\r | |
526 | }\r | |
527 | if (*((UINT8 *)FuncAddr + 4) != 0x11) {\r | |
528 | IsThunk = 0;\r | |
529 | goto Action;\r | |
530 | }\r | |
531 | if (*((UINT8 *)FuncAddr + 5) != 0xCA) {\r | |
532 | IsThunk = 0;\r | |
533 | goto Action;\r | |
534 | }\r | |
535 | if (*((UINT8 *)FuncAddr + 6) != 0xBC) {\r | |
536 | IsThunk = 0;\r | |
537 | goto Action;\r | |
538 | }\r | |
539 | if (*((UINT8 *)FuncAddr + 7) != 0x2E) {\r | |
540 | IsThunk = 0;\r | |
541 | goto Action;\r | |
542 | }\r | |
543 | if (*((UINT8 *)FuncAddr + 8) != 0x11) {\r | |
544 | IsThunk = 0;\r | |
545 | goto Action;\r | |
546 | }\r | |
547 | if (*((UINT8 *)FuncAddr + 9) != 0xCA) {\r | |
548 | IsThunk = 0;\r | |
549 | goto Action;\r | |
550 | }\r | |
551 | if (*((UINT8 *)FuncAddr + 10) != 0x48) {\r | |
552 | IsThunk = 0;\r | |
553 | goto Action;\r | |
554 | }\r | |
555 | if (*((UINT8 *)FuncAddr + 11) != 0xB8) {\r | |
556 | IsThunk = 0;\r | |
557 | goto Action;\r | |
558 | }\r | |
559 | \r | |
560 | CopyMem (&TargetEbcAddr, (UINT8 *)FuncAddr + 12, 8);\r | |
561 | \r | |
562 | Action:\r | |
563 | if (IsThunk == 1){\r | |
564 | //\r | |
565 | // The callee is a thunk to EBC, adjust the stack pointer down 16 bytes and\r | |
566 | // put our return address and frame pointer on the VM stack.\r | |
567 | // Then set the VM's IP to new EBC code.\r | |
568 | //\r | |
569 | VmPtr->R[0] -= 8;\r | |
570 | VmWriteMemN (VmPtr, (UINTN) VmPtr->R[0], (UINTN) FramePtr);\r | |
571 | VmPtr->FramePtr = (VOID *) (UINTN) VmPtr->R[0];\r | |
572 | VmPtr->R[0] -= 8;\r | |
573 | VmWriteMem64 (VmPtr, (UINTN) VmPtr->R[0], (UINT64) (VmPtr->Ip + Size));\r | |
574 | \r | |
575 | VmPtr->Ip = (VMIP) (UINTN) TargetEbcAddr;\r | |
576 | } else {\r | |
577 | //\r | |
578 | // The callee is not a thunk to EBC, call native code.\r | |
579 | //\r | |
580 | EbcLLCALLEXNative (FuncAddr, NewStackPointer, FramePtr);\r | |
581 | \r | |
582 | //\r | |
583 | // Get return value and advance the IP.\r | |
584 | //\r | |
585 | VmPtr->R[7] = EbcLLGetReturnValue ();\r | |
586 | VmPtr->Ip += Size;\r | |
587 | }\r | |
588 | }\r | |
589 | \r |