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a15e5bc2 JB |
1 | /** @file\r |
2 | This module contains EBC support routines that are customized based on\r | |
3 | the target AArch64 processor.\r | |
4 | \r | |
4d1f5a21 AB |
5 | Copyright (c) 2016, Linaro, Ltd. All rights reserved.<BR>\r |
6 | Copyright (c) 2015, The Linux Foundation. All rights reserved.<BR>\r | |
a15e5bc2 | 7 | Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>\r |
4d1f5a21 | 8 | \r |
a15e5bc2 JB |
9 | This program and the accompanying materials\r |
10 | are licensed and made available under the terms and conditions of the BSD License\r | |
11 | which accompanies this distribution. The full text of the license may be found at\r | |
12 | http://opensource.org/licenses/bsd-license.php\r | |
13 | \r | |
14 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
15 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
16 | \r | |
17 | **/\r | |
18 | \r | |
19 | #include "EbcInt.h"\r | |
20 | #include "EbcExecute.h"\r | |
21 | \r | |
22 | //\r | |
23 | // Amount of space that is not used in the stack\r | |
24 | //\r | |
25 | #define STACK_REMAIN_SIZE (1024 * 4)\r | |
26 | \r | |
4d1f5a21 AB |
27 | #pragma pack(1)\r |
28 | typedef struct {\r | |
29 | UINT32 Instr[3];\r | |
30 | UINT32 Magic;\r | |
31 | UINT64 EbcEntryPoint;\r | |
32 | UINT64 EbcLlEntryPoint;\r | |
33 | } EBC_INSTRUCTION_BUFFER;\r | |
34 | #pragma pack()\r | |
35 | \r | |
36 | extern CONST EBC_INSTRUCTION_BUFFER mEbcInstructionBufferTemplate;\r | |
a15e5bc2 JB |
37 | \r |
38 | /**\r | |
39 | Begin executing an EBC image.\r | |
40 | This is used for Ebc Thunk call.\r | |
41 | \r | |
42 | @return The value returned by the EBC application we're going to run.\r | |
43 | \r | |
44 | **/\r | |
45 | UINT64\r | |
46 | EFIAPI\r | |
47 | EbcLLEbcInterpret (\r | |
48 | VOID\r | |
49 | );\r | |
50 | \r | |
51 | /**\r | |
52 | Begin executing an EBC image.\r | |
53 | This is used for Ebc image entrypoint.\r | |
54 | \r | |
55 | @return The value returned by the EBC application we're going to run.\r | |
56 | \r | |
57 | **/\r | |
58 | UINT64\r | |
59 | EFIAPI\r | |
60 | EbcLLExecuteEbcImageEntryPoint (\r | |
61 | VOID\r | |
62 | );\r | |
63 | \r | |
64 | /**\r | |
65 | Pushes a 64 bit unsigned value to the VM stack.\r | |
66 | \r | |
67 | @param VmPtr The pointer to current VM context.\r | |
68 | @param Arg The value to be pushed.\r | |
69 | \r | |
70 | **/\r | |
71 | VOID\r | |
72 | PushU64 (\r | |
73 | IN VM_CONTEXT *VmPtr,\r | |
74 | IN UINT64 Arg\r | |
75 | )\r | |
76 | {\r | |
77 | //\r | |
78 | // Advance the VM stack down, and then copy the argument to the stack.\r | |
79 | // Hope it's aligned.\r | |
80 | //\r | |
81 | VmPtr->Gpr[0] -= sizeof (UINT64);\r | |
82 | *(UINT64 *) VmPtr->Gpr[0] = Arg;\r | |
83 | return;\r | |
84 | }\r | |
85 | \r | |
86 | \r | |
87 | /**\r | |
88 | Begin executing an EBC image.\r | |
89 | \r | |
90 | This is a thunk function.\r | |
91 | \r | |
a15e5bc2 JB |
92 | @param Arg1 The 1st argument.\r |
93 | @param Arg2 The 2nd argument.\r | |
94 | @param Arg3 The 3rd argument.\r | |
95 | @param Arg4 The 4th argument.\r | |
96 | @param Arg5 The 5th argument.\r | |
97 | @param Arg6 The 6th argument.\r | |
98 | @param Arg7 The 7th argument.\r | |
99 | @param Arg8 The 8th argument.\r | |
4a2aaff2 AB |
100 | @param EntryPoint The entrypoint of EBC code.\r |
101 | @param Args9_16[] Array containing arguments #9 to #16.\r | |
a15e5bc2 JB |
102 | \r |
103 | @return The value returned by the EBC application we're going to run.\r | |
104 | \r | |
105 | **/\r | |
106 | UINT64\r | |
107 | EFIAPI\r | |
108 | EbcInterpret (\r | |
4a2aaff2 AB |
109 | IN UINTN Arg1,\r |
110 | IN UINTN Arg2,\r | |
111 | IN UINTN Arg3,\r | |
112 | IN UINTN Arg4,\r | |
113 | IN UINTN Arg5,\r | |
114 | IN UINTN Arg6,\r | |
115 | IN UINTN Arg7,\r | |
116 | IN UINTN Arg8,\r | |
117 | IN UINTN EntryPoint,\r | |
118 | IN CONST UINTN Args9_16[]\r | |
a15e5bc2 JB |
119 | )\r |
120 | {\r | |
121 | //\r | |
122 | // Create a new VM context on the stack\r | |
123 | //\r | |
124 | VM_CONTEXT VmContext;\r | |
125 | UINTN Addr;\r | |
126 | EFI_STATUS Status;\r | |
127 | UINTN StackIndex;\r | |
128 | \r | |
129 | //\r | |
130 | // Get the EBC entry point\r | |
131 | //\r | |
132 | Addr = EntryPoint;\r | |
133 | \r | |
134 | //\r | |
135 | // Now clear out our context\r | |
136 | //\r | |
137 | ZeroMem ((VOID *) &VmContext, sizeof (VM_CONTEXT));\r | |
138 | \r | |
139 | //\r | |
140 | // Set the VM instruction pointer to the correct location in memory.\r | |
141 | //\r | |
142 | VmContext.Ip = (VMIP) Addr;\r | |
143 | \r | |
144 | //\r | |
145 | // Initialize the stack pointer for the EBC. Get the current system stack\r | |
146 | // pointer and adjust it down by the max needed for the interpreter.\r | |
147 | //\r | |
148 | \r | |
149 | //\r | |
150 | // Adjust the VM's stack pointer down.\r | |
151 | //\r | |
152 | \r | |
153 | Status = GetEBCStack((EFI_HANDLE)(UINTN)-1, &VmContext.StackPool, &StackIndex);\r | |
154 | if (EFI_ERROR(Status)) {\r | |
155 | return Status;\r | |
156 | }\r | |
157 | VmContext.StackTop = (UINT8*)VmContext.StackPool + (STACK_REMAIN_SIZE);\r | |
158 | VmContext.Gpr[0] = (UINT64) ((UINT8*)VmContext.StackPool + STACK_POOL_SIZE);\r | |
159 | VmContext.HighStackBottom = (UINTN) VmContext.Gpr[0];\r | |
160 | VmContext.Gpr[0] -= sizeof (UINTN);\r | |
161 | \r | |
162 | //\r | |
163 | // Align the stack on a natural boundary.\r | |
164 | //\r | |
165 | VmContext.Gpr[0] &= ~(VM_REGISTER)(sizeof (UINTN) - 1);\r | |
166 | \r | |
167 | //\r | |
168 | // Put a magic value in the stack gap, then adjust down again.\r | |
169 | //\r | |
170 | *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) VM_STACK_KEY_VALUE;\r | |
171 | VmContext.StackMagicPtr = (UINTN *) (UINTN) VmContext.Gpr[0];\r | |
172 | \r | |
173 | //\r | |
174 | // The stack upper to LowStackTop is belong to the VM.\r | |
175 | //\r | |
176 | VmContext.LowStackTop = (UINTN) VmContext.Gpr[0];\r | |
177 | \r | |
178 | //\r | |
179 | // For the worst case, assume there are 4 arguments passed in registers, store\r | |
180 | // them to VM's stack.\r | |
181 | //\r | |
4a2aaff2 AB |
182 | PushU64 (&VmContext, (UINT64) Args9_16[7]);\r |
183 | PushU64 (&VmContext, (UINT64) Args9_16[6]);\r | |
184 | PushU64 (&VmContext, (UINT64) Args9_16[5]);\r | |
185 | PushU64 (&VmContext, (UINT64) Args9_16[4]);\r | |
186 | PushU64 (&VmContext, (UINT64) Args9_16[3]);\r | |
187 | PushU64 (&VmContext, (UINT64) Args9_16[2]);\r | |
188 | PushU64 (&VmContext, (UINT64) Args9_16[1]);\r | |
189 | PushU64 (&VmContext, (UINT64) Args9_16[0]);\r | |
a15e5bc2 JB |
190 | PushU64 (&VmContext, (UINT64) Arg8);\r |
191 | PushU64 (&VmContext, (UINT64) Arg7);\r | |
192 | PushU64 (&VmContext, (UINT64) Arg6);\r | |
193 | PushU64 (&VmContext, (UINT64) Arg5);\r | |
194 | PushU64 (&VmContext, (UINT64) Arg4);\r | |
195 | PushU64 (&VmContext, (UINT64) Arg3);\r | |
196 | PushU64 (&VmContext, (UINT64) Arg2);\r | |
197 | PushU64 (&VmContext, (UINT64) Arg1);\r | |
198 | \r | |
199 | //\r | |
200 | // Interpreter assumes 64-bit return address is pushed on the stack.\r | |
201 | // AArch64 does not do this so pad the stack accordingly.\r | |
202 | //\r | |
203 | PushU64 (&VmContext, (UINT64) 0);\r | |
204 | PushU64 (&VmContext, (UINT64) 0x1234567887654321ULL);\r | |
205 | \r | |
206 | //\r | |
207 | // For AArch64, this is where we say our return address is\r | |
208 | //\r | |
209 | VmContext.StackRetAddr = (UINT64) VmContext.Gpr[0];\r | |
210 | \r | |
211 | //\r | |
212 | // We need to keep track of where the EBC stack starts. This way, if the EBC\r | |
213 | // accesses any stack variables above its initial stack setting, then we know\r | |
214 | // it's accessing variables passed into it, which means the data is on the\r | |
215 | // VM's stack.\r | |
216 | // When we're called, on the stack (high to low) we have the parameters, the\r | |
217 | // return address, then the saved ebp. Save the pointer to the return address.\r | |
218 | // EBC code knows that's there, so should look above it for function parameters.\r | |
219 | // The offset is the size of locals (VMContext + Addr + saved ebp).\r | |
220 | // Note that the interpreter assumes there is a 16 bytes of return address on\r | |
221 | // the stack too, so adjust accordingly.\r | |
222 | // VmContext.HighStackBottom = (UINTN)(Addr + sizeof (VmContext) + sizeof (Addr));\r | |
223 | //\r | |
224 | \r | |
225 | //\r | |
226 | // Begin executing the EBC code\r | |
227 | //\r | |
228 | EbcExecute (&VmContext);\r | |
229 | \r | |
230 | //\r | |
231 | // Return the value in R[7] unless there was an error\r | |
232 | //\r | |
233 | ReturnEBCStack(StackIndex);\r | |
234 | return (UINT64) VmContext.Gpr[7];\r | |
235 | }\r | |
236 | \r | |
237 | \r | |
238 | /**\r | |
239 | Begin executing an EBC image.\r | |
240 | \r | |
a15e5bc2 JB |
241 | @param ImageHandle image handle for the EBC application we're executing\r |
242 | @param SystemTable standard system table passed into an driver's entry\r | |
243 | point\r | |
4a2aaff2 | 244 | @param EntryPoint The entrypoint of EBC code.\r |
a15e5bc2 JB |
245 | \r |
246 | @return The value returned by the EBC application we're going to run.\r | |
247 | \r | |
248 | **/\r | |
249 | UINT64\r | |
250 | EFIAPI\r | |
251 | ExecuteEbcImageEntryPoint (\r | |
a15e5bc2 | 252 | IN EFI_HANDLE ImageHandle,\r |
4a2aaff2 AB |
253 | IN EFI_SYSTEM_TABLE *SystemTable,\r |
254 | IN UINTN EntryPoint\r | |
a15e5bc2 JB |
255 | )\r |
256 | {\r | |
257 | //\r | |
258 | // Create a new VM context on the stack\r | |
259 | //\r | |
260 | VM_CONTEXT VmContext;\r | |
261 | UINTN Addr;\r | |
262 | EFI_STATUS Status;\r | |
263 | UINTN StackIndex;\r | |
264 | \r | |
265 | //\r | |
266 | // Get the EBC entry point\r | |
267 | //\r | |
268 | Addr = EntryPoint;\r | |
269 | \r | |
270 | //\r | |
271 | // Now clear out our context\r | |
272 | //\r | |
273 | ZeroMem ((VOID *) &VmContext, sizeof (VM_CONTEXT));\r | |
274 | \r | |
275 | //\r | |
276 | // Save the image handle so we can track the thunks created for this image\r | |
277 | //\r | |
278 | VmContext.ImageHandle = ImageHandle;\r | |
279 | VmContext.SystemTable = SystemTable;\r | |
280 | \r | |
281 | //\r | |
282 | // Set the VM instruction pointer to the correct location in memory.\r | |
283 | //\r | |
284 | VmContext.Ip = (VMIP) Addr;\r | |
285 | \r | |
286 | //\r | |
287 | // Initialize the stack pointer for the EBC. Get the current system stack\r | |
288 | // pointer and adjust it down by the max needed for the interpreter.\r | |
289 | //\r | |
290 | \r | |
291 | Status = GetEBCStack(ImageHandle, &VmContext.StackPool, &StackIndex);\r | |
292 | if (EFI_ERROR(Status)) {\r | |
293 | return Status;\r | |
294 | }\r | |
295 | VmContext.StackTop = (UINT8*)VmContext.StackPool + (STACK_REMAIN_SIZE);\r | |
296 | VmContext.Gpr[0] = (UINT64) ((UINT8*)VmContext.StackPool + STACK_POOL_SIZE);\r | |
297 | VmContext.HighStackBottom = (UINTN) VmContext.Gpr[0];\r | |
298 | VmContext.Gpr[0] -= sizeof (UINTN);\r | |
299 | \r | |
300 | \r | |
301 | //\r | |
302 | // Put a magic value in the stack gap, then adjust down again\r | |
303 | //\r | |
304 | *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) VM_STACK_KEY_VALUE;\r | |
305 | VmContext.StackMagicPtr = (UINTN *) (UINTN) VmContext.Gpr[0];\r | |
306 | \r | |
307 | //\r | |
308 | // Align the stack on a natural boundary\r | |
309 | VmContext.Gpr[0] &= ~(VM_REGISTER)(sizeof(UINTN) - 1);\r | |
310 | //\r | |
311 | VmContext.LowStackTop = (UINTN) VmContext.Gpr[0];\r | |
312 | \r | |
313 | //\r | |
314 | // Simply copy the image handle and system table onto the EBC stack.\r | |
315 | // Greatly simplifies things by not having to spill the args.\r | |
316 | //\r | |
317 | PushU64 (&VmContext, (UINT64) SystemTable);\r | |
318 | PushU64 (&VmContext, (UINT64) ImageHandle);\r | |
319 | \r | |
320 | //\r | |
321 | // VM pushes 16-bytes for return address. Simulate that here.\r | |
322 | //\r | |
323 | PushU64 (&VmContext, (UINT64) 0);\r | |
324 | PushU64 (&VmContext, (UINT64) 0x1234567887654321ULL);\r | |
325 | \r | |
326 | //\r | |
327 | // For AArch64, this is where we say our return address is\r | |
328 | //\r | |
329 | VmContext.StackRetAddr = (UINT64) VmContext.Gpr[0];\r | |
330 | \r | |
331 | //\r | |
332 | // Entry function needn't access high stack context, simply\r | |
333 | // put the stack pointer here.\r | |
334 | //\r | |
335 | \r | |
336 | //\r | |
337 | // Begin executing the EBC code\r | |
338 | //\r | |
339 | EbcExecute (&VmContext);\r | |
340 | \r | |
341 | //\r | |
342 | // Return the value in R[7] unless there was an error\r | |
343 | //\r | |
344 | ReturnEBCStack(StackIndex);\r | |
345 | return (UINT64) VmContext.Gpr[7];\r | |
346 | }\r | |
347 | \r | |
348 | \r | |
349 | /**\r | |
350 | Create thunks for an EBC image entry point, or an EBC protocol service.\r | |
351 | \r | |
352 | @param ImageHandle Image handle for the EBC image. If not null, then\r | |
353 | we're creating a thunk for an image entry point.\r | |
354 | @param EbcEntryPoint Address of the EBC code that the thunk is to call\r | |
355 | @param Thunk Returned thunk we create here\r | |
356 | @param Flags Flags indicating options for creating the thunk\r | |
357 | \r | |
358 | @retval EFI_SUCCESS The thunk was created successfully.\r | |
359 | @retval EFI_INVALID_PARAMETER The parameter of EbcEntryPoint is not 16-bit\r | |
360 | aligned.\r | |
361 | @retval EFI_OUT_OF_RESOURCES There is not enough memory to created the EBC\r | |
362 | Thunk.\r | |
363 | @retval EFI_BUFFER_TOO_SMALL EBC_THUNK_SIZE is not larger enough.\r | |
364 | \r | |
365 | **/\r | |
366 | EFI_STATUS\r | |
367 | EbcCreateThunks (\r | |
368 | IN EFI_HANDLE ImageHandle,\r | |
369 | IN VOID *EbcEntryPoint,\r | |
370 | OUT VOID **Thunk,\r | |
371 | IN UINT32 Flags\r | |
372 | )\r | |
373 | {\r | |
4d1f5a21 | 374 | EBC_INSTRUCTION_BUFFER *InstructionBuffer;\r |
a15e5bc2 JB |
375 | \r |
376 | //\r | |
377 | // Check alignment of pointer to EBC code\r | |
378 | //\r | |
379 | if ((UINT32) (UINTN) EbcEntryPoint & 0x01) {\r | |
380 | return EFI_INVALID_PARAMETER;\r | |
381 | }\r | |
382 | \r | |
4d1f5a21 AB |
383 | InstructionBuffer = AllocatePool (sizeof (EBC_INSTRUCTION_BUFFER));\r |
384 | if (InstructionBuffer == NULL) {\r | |
a15e5bc2 JB |
385 | return EFI_OUT_OF_RESOURCES;\r |
386 | }\r | |
a15e5bc2 JB |
387 | \r |
388 | //\r | |
389 | // Give them the address of our buffer we're going to fix up\r | |
390 | //\r | |
4d1f5a21 | 391 | *Thunk = InstructionBuffer;\r |
a15e5bc2 JB |
392 | \r |
393 | //\r | |
394 | // Copy whole thunk instruction buffer template\r | |
395 | //\r | |
4d1f5a21 AB |
396 | CopyMem (InstructionBuffer, &mEbcInstructionBufferTemplate,\r |
397 | sizeof (EBC_INSTRUCTION_BUFFER));\r | |
a15e5bc2 JB |
398 | \r |
399 | //\r | |
400 | // Patch EbcEntryPoint and EbcLLEbcInterpret\r | |
401 | //\r | |
4d1f5a21 AB |
402 | InstructionBuffer->EbcEntryPoint = (UINT64)EbcEntryPoint;\r |
403 | if ((Flags & FLAG_THUNK_ENTRY_POINT) != 0) {\r | |
404 | InstructionBuffer->EbcLlEntryPoint = (UINT64)EbcLLExecuteEbcImageEntryPoint;\r | |
405 | } else {\r | |
406 | InstructionBuffer->EbcLlEntryPoint = (UINT64)EbcLLEbcInterpret;\r | |
a15e5bc2 JB |
407 | }\r |
408 | \r | |
409 | //\r | |
410 | // Add the thunk to the list for this image. Do this last since the add\r | |
411 | // function flushes the cache for us.\r | |
412 | //\r | |
4d1f5a21 AB |
413 | EbcAddImageThunk (ImageHandle, InstructionBuffer,\r |
414 | sizeof (EBC_INSTRUCTION_BUFFER));\r | |
a15e5bc2 JB |
415 | \r |
416 | return EFI_SUCCESS;\r | |
417 | }\r | |
418 | \r | |
419 | \r | |
420 | /**\r | |
421 | This function is called to execute an EBC CALLEX instruction.\r | |
422 | The function check the callee's content to see whether it is common native\r | |
423 | code or a thunk to another piece of EBC code.\r | |
424 | If the callee is common native code, use EbcLLCAllEXASM to manipulate,\r | |
425 | otherwise, set the VM->IP to target EBC code directly to avoid another VM\r | |
426 | be startup which cost time and stack space.\r | |
427 | \r | |
428 | @param VmPtr Pointer to a VM context.\r | |
429 | @param FuncAddr Callee's address\r | |
430 | @param NewStackPointer New stack pointer after the call\r | |
431 | @param FramePtr New frame pointer after the call\r | |
432 | @param Size The size of call instruction\r | |
433 | \r | |
434 | **/\r | |
435 | VOID\r | |
436 | EbcLLCALLEX (\r | |
437 | IN VM_CONTEXT *VmPtr,\r | |
438 | IN UINTN FuncAddr,\r | |
439 | IN UINTN NewStackPointer,\r | |
440 | IN VOID *FramePtr,\r | |
441 | IN UINT8 Size\r | |
442 | )\r | |
443 | {\r | |
4d1f5a21 | 444 | CONST EBC_INSTRUCTION_BUFFER *InstructionBuffer;\r |
a15e5bc2 JB |
445 | \r |
446 | //\r | |
447 | // Processor specific code to check whether the callee is a thunk to EBC.\r | |
448 | //\r | |
4d1f5a21 | 449 | InstructionBuffer = (EBC_INSTRUCTION_BUFFER *)FuncAddr;\r |
a15e5bc2 | 450 | \r |
4d1f5a21 AB |
451 | if (CompareMem (InstructionBuffer, &mEbcInstructionBufferTemplate,\r |
452 | sizeof(EBC_INSTRUCTION_BUFFER) - 2 * sizeof (UINT64)) == 0) {\r | |
a15e5bc2 JB |
453 | //\r |
454 | // The callee is a thunk to EBC, adjust the stack pointer down 16 bytes and\r | |
455 | // put our return address and frame pointer on the VM stack.\r | |
456 | // Then set the VM's IP to new EBC code.\r | |
457 | //\r | |
458 | VmPtr->Gpr[0] -= 8;\r | |
459 | VmWriteMemN (VmPtr, (UINTN) VmPtr->Gpr[0], (UINTN) FramePtr);\r | |
460 | VmPtr->FramePtr = (VOID *) (UINTN) VmPtr->Gpr[0];\r | |
461 | VmPtr->Gpr[0] -= 8;\r | |
462 | VmWriteMem64 (VmPtr, (UINTN) VmPtr->Gpr[0], (UINT64) (UINTN) (VmPtr->Ip + Size));\r | |
463 | \r | |
4d1f5a21 | 464 | VmPtr->Ip = (VMIP) InstructionBuffer->EbcEntryPoint;\r |
a15e5bc2 JB |
465 | } else {\r |
466 | //\r | |
467 | // The callee is not a thunk to EBC, call native code,\r | |
468 | // and get return value.\r | |
469 | //\r | |
470 | VmPtr->Gpr[7] = EbcLLCALLEXNative (FuncAddr, NewStackPointer, FramePtr);\r | |
471 | \r | |
472 | //\r | |
473 | // Advance the IP.\r | |
474 | //\r | |
475 | VmPtr->Ip += Size;\r | |
476 | }\r | |
477 | }\r | |
478 | \r |