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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 | |
d1102dba | 5 | Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r |
9d510e61 | 6 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
fb0b259e | 7 | \r |
8 | **/\r | |
53c71d09 | 9 | \r |
10 | #include "EbcInt.h"\r | |
11 | #include "EbcExecute.h"\r | |
6f0a3cd2 | 12 | #include "EbcDebuggerHook.h"\r |
53c71d09 | 13 | \r |
14 | //\r | |
15 | // NOTE: This is the stack size allocated for the interpreter\r | |
16 | // when it executes an EBC image. The requirements can change\r | |
17 | // based on whether or not a debugger is present, and other\r | |
18 | // platform-specific configurations.\r | |
19 | //\r | |
20 | #define VM_STACK_SIZE (1024 * 8)\r | |
53c71d09 | 21 | \r |
22 | #define STACK_REMAIN_SIZE (1024 * 4)\r | |
23 | \r | |
21d13c61 JY |
24 | //\r |
25 | // This is instruction buffer used to create EBC thunk\r | |
26 | //\r | |
27 | #define EBC_ENTRYPOINT_SIGNATURE 0xAFAFAFAFAFAFAFAFull\r | |
28 | #define EBC_LL_EBC_ENTRYPOINT_SIGNATURE 0xFAFAFAFAFAFAFAFAull\r | |
29 | UINT8 mInstructionBufferTemplate[] = {\r | |
30 | //\r | |
31 | // Add a magic code here to help the VM recognize the thunk..\r | |
32 | // mov rax, 0xca112ebcca112ebc => 48 B8 BC 2E 11 CA BC 2E 11 CA\r | |
33 | //\r | |
34 | 0x48, 0xB8, 0xBC, 0x2E, 0x11, 0xCA, 0xBC, 0x2E, 0x11, 0xCA,\r | |
35 | //\r | |
36 | // Add code bytes to load up a processor register with the EBC entry point.\r | |
37 | // mov r10, EbcEntryPoint => 49 BA XX XX XX XX XX XX XX XX (To be fixed at runtime)\r | |
38 | // These 8 bytes of the thunk entry is the address of the EBC\r | |
39 | // entry point.\r | |
40 | //\r | |
d1102dba | 41 | 0x49, 0xBA,\r |
21d13c61 JY |
42 | (UINT8)(EBC_ENTRYPOINT_SIGNATURE & 0xFF),\r |
43 | (UINT8)((EBC_ENTRYPOINT_SIGNATURE >> 8) & 0xFF),\r | |
44 | (UINT8)((EBC_ENTRYPOINT_SIGNATURE >> 16) & 0xFF),\r | |
45 | (UINT8)((EBC_ENTRYPOINT_SIGNATURE >> 24) & 0xFF),\r | |
46 | (UINT8)((EBC_ENTRYPOINT_SIGNATURE >> 32) & 0xFF),\r | |
47 | (UINT8)((EBC_ENTRYPOINT_SIGNATURE >> 40) & 0xFF),\r | |
48 | (UINT8)((EBC_ENTRYPOINT_SIGNATURE >> 48) & 0xFF),\r | |
49 | (UINT8)((EBC_ENTRYPOINT_SIGNATURE >> 56) & 0xFF),\r | |
50 | //\r | |
51 | // Stick in a load of r11 with the address of appropriate VM function.\r | |
52 | // mov r11, EbcLLEbcInterpret => 49 BB XX XX XX XX XX XX XX XX (To be fixed at runtime)\r | |
53 | //\r | |
54 | 0x49, 0xBB,\r | |
55 | (UINT8)(EBC_LL_EBC_ENTRYPOINT_SIGNATURE & 0xFF),\r | |
56 | (UINT8)((EBC_LL_EBC_ENTRYPOINT_SIGNATURE >> 8) & 0xFF),\r | |
57 | (UINT8)((EBC_LL_EBC_ENTRYPOINT_SIGNATURE >> 16) & 0xFF),\r | |
58 | (UINT8)((EBC_LL_EBC_ENTRYPOINT_SIGNATURE >> 24) & 0xFF),\r | |
59 | (UINT8)((EBC_LL_EBC_ENTRYPOINT_SIGNATURE >> 32) & 0xFF),\r | |
60 | (UINT8)((EBC_LL_EBC_ENTRYPOINT_SIGNATURE >> 40) & 0xFF),\r | |
61 | (UINT8)((EBC_LL_EBC_ENTRYPOINT_SIGNATURE >> 48) & 0xFF),\r | |
62 | (UINT8)((EBC_LL_EBC_ENTRYPOINT_SIGNATURE >> 56) & 0xFF),\r | |
63 | //\r | |
64 | // Stick in jump opcode bytes\r | |
65 | // jmp r11 => 41 FF E3\r | |
66 | //\r | |
67 | 0x41, 0xFF, 0xE3,\r | |
68 | };\r | |
69 | \r | |
7102b199 JY |
70 | /**\r |
71 | Begin executing an EBC image.\r | |
72 | This is used for Ebc Thunk call.\r | |
73 | \r | |
74 | @return The value returned by the EBC application we're going to run.\r | |
75 | \r | |
76 | **/\r | |
77 | UINT64\r | |
78 | EFIAPI\r | |
79 | EbcLLEbcInterpret (\r | |
80 | VOID\r | |
81 | );\r | |
82 | \r | |
83 | /**\r | |
84 | Begin executing an EBC image.\r | |
85 | This is used for Ebc image entrypoint.\r | |
86 | \r | |
87 | @return The value returned by the EBC application we're going to run.\r | |
88 | \r | |
89 | **/\r | |
90 | UINT64\r | |
91 | EFIAPI\r | |
92 | EbcLLExecuteEbcImageEntryPoint (\r | |
93 | VOID\r | |
94 | );\r | |
8e3bc754 | 95 | \r |
96 | /**\r | |
97 | Pushes a 64 bit unsigned value to the VM stack.\r | |
98 | \r | |
99 | @param VmPtr The pointer to current VM context.\r | |
100 | @param Arg The value to be pushed.\r | |
101 | \r | |
102 | **/\r | |
53c71d09 | 103 | VOID\r |
104 | PushU64 (\r | |
8e3bc754 | 105 | IN VM_CONTEXT *VmPtr,\r |
106 | IN UINT64 Arg\r | |
53c71d09 | 107 | )\r |
53c71d09 | 108 | {\r |
109 | //\r | |
110 | // Advance the VM stack down, and then copy the argument to the stack.\r | |
111 | // Hope it's aligned.\r | |
112 | //\r | |
1ccdbf2a | 113 | VmPtr->Gpr[0] -= sizeof (UINT64);\r |
114 | *(UINT64 *) VmPtr->Gpr[0] = Arg;\r | |
53c71d09 | 115 | return;\r |
116 | }\r | |
117 | \r | |
fb0b259e | 118 | \r |
119 | /**\r | |
7102b199 | 120 | Begin executing an EBC image.\r |
fb0b259e | 121 | \r |
122 | This is a thunk function. Microsoft x64 compiler only provide fast_call\r | |
123 | calling convention, so the first four arguments are passed by rcx, rdx,\r | |
124 | r8, and r9, while other arguments are passed in stack.\r | |
125 | \r | |
7102b199 | 126 | @param EntryPoint The entrypoint of EBC code.\r |
8e3bc754 | 127 | @param Arg1 The 1st argument.\r |
128 | @param Arg2 The 2nd argument.\r | |
129 | @param Arg3 The 3rd argument.\r | |
130 | @param Arg4 The 4th argument.\r | |
131 | @param Arg5 The 5th argument.\r | |
132 | @param Arg6 The 6th argument.\r | |
133 | @param Arg7 The 7th argument.\r | |
134 | @param Arg8 The 8th argument.\r | |
135 | @param Arg9 The 9th argument.\r | |
136 | @param Arg10 The 10th argument.\r | |
137 | @param Arg11 The 11th argument.\r | |
138 | @param Arg12 The 12th argument.\r | |
139 | @param Arg13 The 13th argument.\r | |
140 | @param Arg14 The 14th argument.\r | |
141 | @param Arg15 The 15th argument.\r | |
142 | @param Arg16 The 16th argument.\r | |
143 | \r | |
fb0b259e | 144 | @return The value returned by the EBC application we're going to run.\r |
145 | \r | |
146 | **/\r | |
53c71d09 | 147 | UINT64\r |
fa97cbf4 | 148 | EFIAPI\r |
53c71d09 | 149 | EbcInterpret (\r |
7102b199 JY |
150 | IN UINTN EntryPoint,\r |
151 | IN UINTN Arg1,\r | |
152 | IN UINTN Arg2,\r | |
153 | IN UINTN Arg3,\r | |
154 | IN UINTN Arg4,\r | |
155 | IN UINTN Arg5,\r | |
156 | IN UINTN Arg6,\r | |
157 | IN UINTN Arg7,\r | |
158 | IN UINTN Arg8,\r | |
159 | IN UINTN Arg9,\r | |
160 | IN UINTN Arg10,\r | |
161 | IN UINTN Arg11,\r | |
162 | IN UINTN Arg12,\r | |
163 | IN UINTN Arg13,\r | |
164 | IN UINTN Arg14,\r | |
165 | IN UINTN Arg15,\r | |
166 | IN UINTN Arg16\r | |
53c71d09 | 167 | )\r |
53c71d09 | 168 | {\r |
169 | //\r | |
170 | // Create a new VM context on the stack\r | |
171 | //\r | |
172 | VM_CONTEXT VmContext;\r | |
173 | UINTN Addr;\r | |
174 | EFI_STATUS Status;\r | |
175 | UINTN StackIndex;\r | |
176 | \r | |
177 | //\r | |
7102b199 | 178 | // Get the EBC entry point\r |
53c71d09 | 179 | //\r |
7102b199 | 180 | Addr = EntryPoint;\r |
53c71d09 | 181 | \r |
182 | //\r | |
183 | // Now clear out our context\r | |
184 | //\r | |
185 | ZeroMem ((VOID *) &VmContext, sizeof (VM_CONTEXT));\r | |
186 | \r | |
187 | //\r | |
188 | // Set the VM instruction pointer to the correct location in memory.\r | |
189 | //\r | |
190 | VmContext.Ip = (VMIP) Addr;\r | |
191 | \r | |
192 | //\r | |
193 | // Initialize the stack pointer for the EBC. Get the current system stack\r | |
194 | // pointer and adjust it down by the max needed for the interpreter.\r | |
195 | //\r | |
53c71d09 | 196 | \r |
197 | //\r | |
198 | // Adjust the VM's stack pointer down.\r | |
199 | //\r | |
fb0b259e | 200 | \r |
53c71d09 | 201 | Status = GetEBCStack((EFI_HANDLE)(UINTN)-1, &VmContext.StackPool, &StackIndex);\r |
202 | if (EFI_ERROR(Status)) {\r | |
203 | return Status;\r | |
204 | }\r | |
205 | VmContext.StackTop = (UINT8*)VmContext.StackPool + (STACK_REMAIN_SIZE);\r | |
1ccdbf2a | 206 | VmContext.Gpr[0] = (UINT64) ((UINT8*)VmContext.StackPool + STACK_POOL_SIZE);\r |
207 | VmContext.HighStackBottom = (UINTN) VmContext.Gpr[0];\r | |
208 | VmContext.Gpr[0] -= sizeof (UINTN);\r | |
53c71d09 | 209 | \r |
210 | //\r | |
211 | // Align the stack on a natural boundary.\r | |
212 | //\r | |
6e1e5405 | 213 | VmContext.Gpr[0] &= ~(VM_REGISTER)(sizeof (UINTN) - 1);\r |
53c71d09 | 214 | \r |
215 | //\r | |
216 | // Put a magic value in the stack gap, then adjust down again.\r | |
217 | //\r | |
1ccdbf2a | 218 | *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) VM_STACK_KEY_VALUE;\r |
219 | VmContext.StackMagicPtr = (UINTN *) (UINTN) VmContext.Gpr[0];\r | |
53c71d09 | 220 | \r |
221 | //\r | |
222 | // The stack upper to LowStackTop is belong to the VM.\r | |
223 | //\r | |
1ccdbf2a | 224 | VmContext.LowStackTop = (UINTN) VmContext.Gpr[0];\r |
53c71d09 | 225 | \r |
226 | //\r | |
227 | // For the worst case, assume there are 4 arguments passed in registers, store\r | |
228 | // them to VM's stack.\r | |
229 | //\r | |
230 | PushU64 (&VmContext, (UINT64) Arg16);\r | |
231 | PushU64 (&VmContext, (UINT64) Arg15);\r | |
232 | PushU64 (&VmContext, (UINT64) Arg14);\r | |
233 | PushU64 (&VmContext, (UINT64) Arg13);\r | |
234 | PushU64 (&VmContext, (UINT64) Arg12);\r | |
235 | PushU64 (&VmContext, (UINT64) Arg11);\r | |
236 | PushU64 (&VmContext, (UINT64) Arg10);\r | |
237 | PushU64 (&VmContext, (UINT64) Arg9);\r | |
238 | PushU64 (&VmContext, (UINT64) Arg8);\r | |
239 | PushU64 (&VmContext, (UINT64) Arg7);\r | |
240 | PushU64 (&VmContext, (UINT64) Arg6);\r | |
241 | PushU64 (&VmContext, (UINT64) Arg5);\r | |
242 | PushU64 (&VmContext, (UINT64) Arg4);\r | |
243 | PushU64 (&VmContext, (UINT64) Arg3);\r | |
244 | PushU64 (&VmContext, (UINT64) Arg2);\r | |
245 | PushU64 (&VmContext, (UINT64) Arg1);\r | |
246 | \r | |
247 | //\r | |
248 | // Interpreter assumes 64-bit return address is pushed on the stack.\r | |
249 | // The x64 does not do this so pad the stack accordingly.\r | |
250 | //\r | |
251 | PushU64 (&VmContext, (UINT64) 0);\r | |
252 | PushU64 (&VmContext, (UINT64) 0x1234567887654321ULL);\r | |
253 | \r | |
254 | //\r | |
255 | // For x64, this is where we say our return address is\r | |
256 | //\r | |
1ccdbf2a | 257 | VmContext.StackRetAddr = (UINT64) VmContext.Gpr[0];\r |
53c71d09 | 258 | \r |
259 | //\r | |
260 | // We need to keep track of where the EBC stack starts. This way, if the EBC\r | |
261 | // accesses any stack variables above its initial stack setting, then we know\r | |
262 | // it's accessing variables passed into it, which means the data is on the\r | |
263 | // VM's stack.\r | |
264 | // When we're called, on the stack (high to low) we have the parameters, the\r | |
265 | // return address, then the saved ebp. Save the pointer to the return address.\r | |
266 | // EBC code knows that's there, so should look above it for function parameters.\r | |
267 | // The offset is the size of locals (VMContext + Addr + saved ebp).\r | |
268 | // Note that the interpreter assumes there is a 16 bytes of return address on\r | |
269 | // the stack too, so adjust accordingly.\r | |
270 | // VmContext.HighStackBottom = (UINTN)(Addr + sizeof (VmContext) + sizeof (Addr));\r | |
271 | //\r | |
272 | \r | |
273 | //\r | |
274 | // Begin executing the EBC code\r | |
275 | //\r | |
6f0a3cd2 | 276 | EbcDebuggerHookEbcInterpret (&VmContext);\r |
53c71d09 | 277 | EbcExecute (&VmContext);\r |
278 | \r | |
279 | //\r | |
6f0a3cd2 | 280 | // Return the value in Gpr[7] unless there was an error\r |
53c71d09 | 281 | //\r |
282 | ReturnEBCStack(StackIndex);\r | |
1ccdbf2a | 283 | return (UINT64) VmContext.Gpr[7];\r |
53c71d09 | 284 | }\r |
285 | \r | |
53c71d09 | 286 | \r |
fb0b259e | 287 | /**\r |
7102b199 | 288 | Begin executing an EBC image.\r |
53c71d09 | 289 | \r |
7102b199 | 290 | @param EntryPoint The entrypoint of EBC code.\r |
fb0b259e | 291 | @param ImageHandle image handle for the EBC application we're executing\r |
292 | @param SystemTable standard system table passed into an driver's entry\r | |
293 | point\r | |
53c71d09 | 294 | \r |
fb0b259e | 295 | @return The value returned by the EBC application we're going to run.\r |
53c71d09 | 296 | \r |
fb0b259e | 297 | **/\r |
fb0b259e | 298 | UINT64\r |
fa97cbf4 | 299 | EFIAPI\r |
fb0b259e | 300 | ExecuteEbcImageEntryPoint (\r |
7102b199 | 301 | IN UINTN EntryPoint,\r |
fb0b259e | 302 | IN EFI_HANDLE ImageHandle,\r |
303 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
304 | )\r | |
53c71d09 | 305 | {\r |
306 | //\r | |
307 | // Create a new VM context on the stack\r | |
308 | //\r | |
309 | VM_CONTEXT VmContext;\r | |
310 | UINTN Addr;\r | |
311 | EFI_STATUS Status;\r | |
312 | UINTN StackIndex;\r | |
313 | \r | |
314 | //\r | |
7102b199 | 315 | // Get the EBC entry point\r |
53c71d09 | 316 | //\r |
7102b199 | 317 | Addr = EntryPoint;\r |
53c71d09 | 318 | \r |
319 | //\r | |
320 | // Now clear out our context\r | |
321 | //\r | |
322 | ZeroMem ((VOID *) &VmContext, sizeof (VM_CONTEXT));\r | |
323 | \r | |
324 | //\r | |
325 | // Save the image handle so we can track the thunks created for this image\r | |
326 | //\r | |
327 | VmContext.ImageHandle = ImageHandle;\r | |
328 | VmContext.SystemTable = SystemTable;\r | |
329 | \r | |
330 | //\r | |
331 | // Set the VM instruction pointer to the correct location in memory.\r | |
332 | //\r | |
333 | VmContext.Ip = (VMIP) Addr;\r | |
334 | \r | |
335 | //\r | |
336 | // Initialize the stack pointer for the EBC. Get the current system stack\r | |
337 | // pointer and adjust it down by the max needed for the interpreter.\r | |
338 | //\r | |
53c71d09 | 339 | \r |
340 | Status = GetEBCStack(ImageHandle, &VmContext.StackPool, &StackIndex);\r | |
341 | if (EFI_ERROR(Status)) {\r | |
342 | return Status;\r | |
343 | }\r | |
344 | VmContext.StackTop = (UINT8*)VmContext.StackPool + (STACK_REMAIN_SIZE);\r | |
1ccdbf2a | 345 | VmContext.Gpr[0] = (UINT64) ((UINT8*)VmContext.StackPool + STACK_POOL_SIZE);\r |
346 | VmContext.HighStackBottom = (UINTN) VmContext.Gpr[0];\r | |
347 | VmContext.Gpr[0] -= sizeof (UINTN);\r | |
53c71d09 | 348 | \r |
349 | \r | |
350 | //\r | |
351 | // Put a magic value in the stack gap, then adjust down again\r | |
352 | //\r | |
1ccdbf2a | 353 | *(UINTN *) (UINTN) (VmContext.Gpr[0]) = (UINTN) VM_STACK_KEY_VALUE;\r |
354 | VmContext.StackMagicPtr = (UINTN *) (UINTN) VmContext.Gpr[0];\r | |
53c71d09 | 355 | \r |
356 | //\r | |
357 | // Align the stack on a natural boundary\r | |
6e1e5405 | 358 | VmContext.Gpr[0] &= ~(VM_REGISTER)(sizeof(UINTN) - 1);\r |
53c71d09 | 359 | //\r |
1ccdbf2a | 360 | VmContext.LowStackTop = (UINTN) VmContext.Gpr[0];\r |
53c71d09 | 361 | \r |
362 | //\r | |
363 | // Simply copy the image handle and system table onto the EBC stack.\r | |
364 | // Greatly simplifies things by not having to spill the args.\r | |
365 | //\r | |
366 | PushU64 (&VmContext, (UINT64) SystemTable);\r | |
367 | PushU64 (&VmContext, (UINT64) ImageHandle);\r | |
368 | \r | |
369 | //\r | |
370 | // VM pushes 16-bytes for return address. Simulate that here.\r | |
371 | //\r | |
372 | PushU64 (&VmContext, (UINT64) 0);\r | |
373 | PushU64 (&VmContext, (UINT64) 0x1234567887654321ULL);\r | |
374 | \r | |
375 | //\r | |
376 | // For x64, this is where we say our return address is\r | |
377 | //\r | |
1ccdbf2a | 378 | VmContext.StackRetAddr = (UINT64) VmContext.Gpr[0];\r |
53c71d09 | 379 | \r |
380 | //\r | |
381 | // Entry function needn't access high stack context, simply\r | |
382 | // put the stack pointer here.\r | |
383 | //\r | |
384 | \r | |
385 | //\r | |
386 | // Begin executing the EBC code\r | |
387 | //\r | |
6f0a3cd2 | 388 | EbcDebuggerHookExecuteEbcImageEntryPoint (&VmContext);\r |
53c71d09 | 389 | EbcExecute (&VmContext);\r |
390 | \r | |
391 | //\r | |
6f0a3cd2 | 392 | // Return the value in Gpr[7] unless there was an error\r |
53c71d09 | 393 | //\r |
394 | ReturnEBCStack(StackIndex);\r | |
1ccdbf2a | 395 | return (UINT64) VmContext.Gpr[7];\r |
53c71d09 | 396 | }\r |
397 | \r | |
fb0b259e | 398 | \r |
399 | /**\r | |
8e3bc754 | 400 | Create thunks for an EBC image entry point, or an EBC protocol service.\r |
fb0b259e | 401 | \r |
8e3bc754 | 402 | @param ImageHandle Image handle for the EBC image. If not null, then\r |
403 | we're creating a thunk for an image entry point.\r | |
404 | @param EbcEntryPoint Address of the EBC code that the thunk is to call\r | |
405 | @param Thunk Returned thunk we create here\r | |
406 | @param Flags Flags indicating options for creating the thunk\r | |
fb0b259e | 407 | \r |
8e3bc754 | 408 | @retval EFI_SUCCESS The thunk was created successfully.\r |
409 | @retval EFI_INVALID_PARAMETER The parameter of EbcEntryPoint is not 16-bit\r | |
410 | aligned.\r | |
411 | @retval EFI_OUT_OF_RESOURCES There is not enough memory to created the EBC\r | |
412 | Thunk.\r | |
413 | @retval EFI_BUFFER_TOO_SMALL EBC_THUNK_SIZE is not larger enough.\r | |
fb0b259e | 414 | \r |
415 | **/\r | |
53c71d09 | 416 | EFI_STATUS\r |
417 | EbcCreateThunks (\r | |
418 | IN EFI_HANDLE ImageHandle,\r | |
419 | IN VOID *EbcEntryPoint,\r | |
420 | OUT VOID **Thunk,\r | |
421 | IN UINT32 Flags\r | |
422 | )\r | |
53c71d09 | 423 | {\r |
424 | UINT8 *Ptr;\r | |
425 | UINT8 *ThunkBase;\r | |
8e3bc754 | 426 | UINT32 Index;\r |
53c71d09 | 427 | INT32 ThunkSize;\r |
428 | \r | |
429 | //\r | |
430 | // Check alignment of pointer to EBC code\r | |
431 | //\r | |
432 | if ((UINT32) (UINTN) EbcEntryPoint & 0x01) {\r | |
433 | return EFI_INVALID_PARAMETER;\r | |
434 | }\r | |
435 | \r | |
21d13c61 | 436 | ThunkSize = sizeof(mInstructionBufferTemplate);\r |
53c71d09 | 437 | \r |
16dc5b68 | 438 | Ptr = EbcAllocatePoolForThunk (sizeof(mInstructionBufferTemplate));\r |
53c71d09 | 439 | \r |
440 | if (Ptr == NULL) {\r | |
441 | return EFI_OUT_OF_RESOURCES;\r | |
442 | }\r | |
443 | //\r | |
444 | // Print(L"Allocate TH: 0x%X\n", (UINT32)Ptr);\r | |
445 | //\r | |
446 | // Save the start address so we can add a pointer to it to a list later.\r | |
447 | //\r | |
448 | ThunkBase = Ptr;\r | |
449 | \r | |
450 | //\r | |
451 | // Give them the address of our buffer we're going to fix up\r | |
452 | //\r | |
453 | *Thunk = (VOID *) Ptr;\r | |
454 | \r | |
455 | //\r | |
21d13c61 | 456 | // Copy whole thunk instruction buffer template\r |
53c71d09 | 457 | //\r |
21d13c61 | 458 | CopyMem (Ptr, mInstructionBufferTemplate, sizeof(mInstructionBufferTemplate));\r |
53c71d09 | 459 | \r |
460 | //\r | |
21d13c61 | 461 | // Patch EbcEntryPoint and EbcLLEbcInterpret\r |
53c71d09 | 462 | //\r |
21d13c61 JY |
463 | for (Index = 0; Index < sizeof(mInstructionBufferTemplate) - sizeof(UINTN); Index++) {\r |
464 | if (*(UINTN *)&Ptr[Index] == EBC_ENTRYPOINT_SIGNATURE) {\r | |
465 | *(UINTN *)&Ptr[Index] = (UINTN)EbcEntryPoint;\r | |
466 | }\r | |
467 | if (*(UINTN *)&Ptr[Index] == EBC_LL_EBC_ENTRYPOINT_SIGNATURE) {\r | |
468 | if ((Flags & FLAG_THUNK_ENTRY_POINT) != 0) {\r | |
469 | *(UINTN *)&Ptr[Index] = (UINTN)EbcLLExecuteEbcImageEntryPoint;\r | |
470 | } else {\r | |
471 | *(UINTN *)&Ptr[Index] = (UINTN)EbcLLEbcInterpret;\r | |
472 | }\r | |
473 | }\r | |
53c71d09 | 474 | }\r |
475 | \r | |
53c71d09 | 476 | //\r |
477 | // Add the thunk to the list for this image. Do this last since the add\r | |
478 | // function flushes the cache for us.\r | |
479 | //\r | |
480 | EbcAddImageThunk (ImageHandle, (VOID *) ThunkBase, ThunkSize);\r | |
481 | \r | |
482 | return EFI_SUCCESS;\r | |
483 | }\r | |
484 | \r | |
53c71d09 | 485 | \r |
fb0b259e | 486 | /**\r |
487 | This function is called to execute an EBC CALLEX instruction.\r | |
53c71d09 | 488 | The function check the callee's content to see whether it is common native\r |
489 | code or a thunk to another piece of EBC code.\r | |
490 | If the callee is common native code, use EbcLLCAllEXASM to manipulate,\r | |
491 | otherwise, set the VM->IP to target EBC code directly to avoid another VM\r | |
492 | be startup which cost time and stack space.\r | |
53c71d09 | 493 | \r |
fb0b259e | 494 | @param VmPtr Pointer to a VM context.\r |
495 | @param FuncAddr Callee's address\r | |
496 | @param NewStackPointer New stack pointer after the call\r | |
497 | @param FramePtr New frame pointer after the call\r | |
498 | @param Size The size of call instruction\r | |
53c71d09 | 499 | \r |
fb0b259e | 500 | **/\r |
501 | VOID\r | |
502 | EbcLLCALLEX (\r | |
503 | IN VM_CONTEXT *VmPtr,\r | |
504 | IN UINTN FuncAddr,\r | |
505 | IN UINTN NewStackPointer,\r | |
506 | IN VOID *FramePtr,\r | |
507 | IN UINT8 Size\r | |
508 | )\r | |
53c71d09 | 509 | {\r |
510 | UINTN IsThunk;\r | |
511 | UINTN TargetEbcAddr;\r | |
21d13c61 JY |
512 | UINT8 InstructionBuffer[sizeof(mInstructionBufferTemplate)];\r |
513 | UINTN Index;\r | |
514 | UINTN IndexOfEbcEntrypoint;\r | |
53c71d09 | 515 | \r |
516 | IsThunk = 1;\r | |
517 | TargetEbcAddr = 0;\r | |
21d13c61 | 518 | IndexOfEbcEntrypoint = 0;\r |
53c71d09 | 519 | \r |
520 | //\r | |
521 | // Processor specific code to check whether the callee is a thunk to EBC.\r | |
522 | //\r | |
21d13c61 JY |
523 | CopyMem (InstructionBuffer, (VOID *)FuncAddr, sizeof(InstructionBuffer));\r |
524 | //\r | |
525 | // Fill the signature according to mInstructionBufferTemplate\r | |
526 | //\r | |
527 | for (Index = 0; Index < sizeof(mInstructionBufferTemplate) - sizeof(UINTN); Index++) {\r | |
528 | if (*(UINTN *)&mInstructionBufferTemplate[Index] == EBC_ENTRYPOINT_SIGNATURE) {\r | |
529 | *(UINTN *)&InstructionBuffer[Index] = EBC_ENTRYPOINT_SIGNATURE;\r | |
530 | IndexOfEbcEntrypoint = Index;\r | |
531 | }\r | |
532 | if (*(UINTN *)&mInstructionBufferTemplate[Index] == EBC_LL_EBC_ENTRYPOINT_SIGNATURE) {\r | |
533 | *(UINTN *)&InstructionBuffer[Index] = EBC_LL_EBC_ENTRYPOINT_SIGNATURE;\r | |
534 | }\r | |
53c71d09 | 535 | }\r |
21d13c61 JY |
536 | //\r |
537 | // Check if we need thunk to native\r | |
538 | //\r | |
539 | if (CompareMem (InstructionBuffer, mInstructionBufferTemplate, sizeof(mInstructionBufferTemplate)) != 0) {\r | |
53c71d09 | 540 | IsThunk = 0;\r |
53c71d09 | 541 | }\r |
542 | \r | |
53c71d09 | 543 | if (IsThunk == 1){\r |
544 | //\r | |
545 | // The callee is a thunk to EBC, adjust the stack pointer down 16 bytes and\r | |
546 | // put our return address and frame pointer on the VM stack.\r | |
547 | // Then set the VM's IP to new EBC code.\r | |
548 | //\r | |
1ccdbf2a | 549 | VmPtr->Gpr[0] -= 8;\r |
550 | VmWriteMemN (VmPtr, (UINTN) VmPtr->Gpr[0], (UINTN) FramePtr);\r | |
551 | VmPtr->FramePtr = (VOID *) (UINTN) VmPtr->Gpr[0];\r | |
552 | VmPtr->Gpr[0] -= 8;\r | |
21d13c61 | 553 | VmWriteMem64 (VmPtr, (UINTN) VmPtr->Gpr[0], (UINT64) (UINTN) (VmPtr->Ip + Size));\r |
53c71d09 | 554 | \r |
21d13c61 | 555 | CopyMem (&TargetEbcAddr, (UINT8 *)FuncAddr + IndexOfEbcEntrypoint, sizeof(UINTN));\r |
53c71d09 | 556 | VmPtr->Ip = (VMIP) (UINTN) TargetEbcAddr;\r |
557 | } else {\r | |
558 | //\r | |
fa97cbf4 JY |
559 | // The callee is not a thunk to EBC, call native code,\r |
560 | // and get return value.\r | |
53c71d09 | 561 | //\r |
fa97cbf4 | 562 | VmPtr->Gpr[7] = EbcLLCALLEXNative (FuncAddr, NewStackPointer, FramePtr);\r |
53c71d09 | 563 | \r |
564 | //\r | |
fa97cbf4 | 565 | // Advance the IP.\r |
53c71d09 | 566 | //\r |
53c71d09 | 567 | VmPtr->Ip += Size;\r |
568 | }\r | |
569 | }\r | |
570 | \r |