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1 | /** @file\r | |
2 | Main routines for the EBC interpreter. Includes the initialization and\r | |
3 | main interpreter routines.\r | |
4 | \r | |
5 | Copyright (c) 2006 - 2010, Intel Corporation. <BR>\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 | \r | |
16 | #ifndef _EBC_INT_H_\r | |
17 | #define _EBC_INT_H_\r | |
18 | \r | |
19 | \r | |
20 | #include <Uefi.h>\r | |
21 | \r | |
22 | #include <Protocol/DebugSupport.h>\r | |
23 | #include <Protocol/Ebc.h>\r | |
24 | \r | |
25 | #include <Library/BaseLib.h>\r | |
26 | #include <Library/DebugLib.h>\r | |
27 | #include <Library/UefiDriverEntryPoint.h>\r | |
28 | #include <Library/BaseMemoryLib.h>\r | |
29 | #include <Library/UefiBootServicesTableLib.h>\r | |
30 | #include <Library/MemoryAllocationLib.h>\r | |
31 | \r | |
32 | typedef INT64 VM_REGISTER;\r | |
33 | typedef UINT8 *VMIP; // instruction pointer for the VM\r | |
34 | typedef UINT32 EXCEPTION_FLAGS;\r | |
35 | \r | |
36 | typedef struct {\r | |
37 | VM_REGISTER Gpr[8]; // General purpose registers.\r | |
38 | UINT64 Flags; // Flags register:\r | |
39 | // 0 Set to 1 if the result of the last compare was true\r | |
40 | // 1 Set to 1 if stepping\r | |
41 | // 2..63 Reserved.\r | |
42 | VMIP Ip; // Instruction pointer.\r | |
43 | UINTN LastException; //\r | |
44 | EXCEPTION_FLAGS ExceptionFlags; // to keep track of exceptions\r | |
45 | UINT32 StopFlags;\r | |
46 | UINT32 CompilerVersion; // via break(6)\r | |
47 | UINTN HighStackBottom; // bottom of the upper stack\r | |
48 | UINTN LowStackTop; // top of the lower stack\r | |
49 | UINT64 StackRetAddr; // location of final return address on stack\r | |
50 | UINTN *StackMagicPtr; // pointer to magic value on stack to detect corruption\r | |
51 | EFI_HANDLE ImageHandle; // for this EBC driver\r | |
52 | EFI_SYSTEM_TABLE *SystemTable; // for debugging only\r | |
53 | UINTN LastAddrConverted; // for debug\r | |
54 | UINTN LastAddrConvertedValue; // for debug\r | |
55 | VOID *FramePtr;\r | |
56 | VOID *EntryPoint; // entry point of EBC image\r | |
57 | UINTN ImageBase;\r | |
58 | VOID *StackPool;\r | |
59 | VOID *StackTop;\r | |
60 | } VM_CONTEXT;\r | |
61 | \r | |
62 | extern VM_CONTEXT *mVmPtr;\r | |
63 | \r | |
64 | //\r | |
65 | // Bits of exception flags field of VM context\r | |
66 | //\r | |
67 | #define EXCEPTION_FLAG_FATAL 0x80000000 // can't continue\r | |
68 | #define EXCEPTION_FLAG_ERROR 0x40000000 // bad, but try to continue\r | |
69 | #define EXCEPTION_FLAG_WARNING 0x20000000 // harmless problem\r | |
70 | #define EXCEPTION_FLAG_NONE 0x00000000 // for normal return\r | |
71 | //\r | |
72 | // Flags passed to the internal create-thunks function.\r | |
73 | //\r | |
74 | #define FLAG_THUNK_ENTRY_POINT 0x01 // thunk for an image entry point\r | |
75 | #define FLAG_THUNK_PROTOCOL 0x00 // thunk for an EBC protocol service\r | |
76 | //\r | |
77 | // Put this value at the bottom of the VM's stack gap so we can check it on\r | |
78 | // occasion to make sure the stack has not been corrupted.\r | |
79 | //\r | |
80 | #define VM_STACK_KEY_VALUE 0xDEADBEEF\r | |
81 | \r | |
82 | /**\r | |
83 | Create thunks for an EBC image entry point, or an EBC protocol service.\r | |
84 | \r | |
85 | @param ImageHandle Image handle for the EBC image. If not null, then\r | |
86 | we're creating a thunk for an image entry point.\r | |
87 | @param EbcEntryPoint Address of the EBC code that the thunk is to call\r | |
88 | @param Thunk Returned thunk we create here\r | |
89 | @param Flags Flags indicating options for creating the thunk\r | |
90 | \r | |
91 | @retval EFI_SUCCESS The thunk was created successfully.\r | |
92 | @retval EFI_INVALID_PARAMETER The parameter of EbcEntryPoint is not 16-bit\r | |
93 | aligned.\r | |
94 | @retval EFI_OUT_OF_RESOURCES There is not enough memory to created the EBC\r | |
95 | Thunk.\r | |
96 | @retval EFI_BUFFER_TOO_SMALL EBC_THUNK_SIZE is not larger enough.\r | |
97 | \r | |
98 | **/\r | |
99 | EFI_STATUS\r | |
100 | EbcCreateThunks (\r | |
101 | IN EFI_HANDLE ImageHandle,\r | |
102 | IN VOID *EbcEntryPoint,\r | |
103 | OUT VOID **Thunk,\r | |
104 | IN UINT32 Flags\r | |
105 | );\r | |
106 | \r | |
107 | /**\r | |
108 | Add a thunk to our list of thunks for a given image handle.\r | |
109 | Also flush the instruction cache since we've written thunk code\r | |
110 | to memory that will be executed eventually.\r | |
111 | \r | |
112 | @param ImageHandle The image handle to which the thunk is tied.\r | |
113 | @param ThunkBuffer The buffer that has been created/allocated.\r | |
114 | @param ThunkSize The size of the thunk memory allocated.\r | |
115 | \r | |
116 | @retval EFI_OUT_OF_RESOURCES Memory allocation failed.\r | |
117 | @retval EFI_SUCCESS The function completed successfully.\r | |
118 | \r | |
119 | **/\r | |
120 | EFI_STATUS\r | |
121 | EbcAddImageThunk (\r | |
122 | IN EFI_HANDLE ImageHandle,\r | |
123 | IN VOID *ThunkBuffer,\r | |
124 | IN UINT32 ThunkSize\r | |
125 | );\r | |
126 | \r | |
127 | //\r | |
128 | // The interpreter calls these when an exception is detected,\r | |
129 | // or as a periodic callback.\r | |
130 | //\r | |
131 | /**\r | |
132 | The VM interpreter calls this function when an exception is detected.\r | |
133 | \r | |
134 | @param ExceptionType Specifies the processor exception detected.\r | |
135 | @param ExceptionFlags Specifies the exception context.\r | |
136 | @param VmPtr Pointer to a VM context for passing info to the\r | |
137 | EFI debugger.\r | |
138 | \r | |
139 | @retval EFI_SUCCESS This function completed successfully.\r | |
140 | \r | |
141 | **/\r | |
142 | EFI_STATUS\r | |
143 | EbcDebugSignalException (\r | |
144 | IN EFI_EXCEPTION_TYPE ExceptionType,\r | |
145 | IN EXCEPTION_FLAGS ExceptionFlags,\r | |
146 | IN VM_CONTEXT *VmPtr\r | |
147 | );\r | |
148 | \r | |
149 | //\r | |
150 | // Define a constant of how often to call the debugger periodic callback\r | |
151 | // function.\r | |
152 | //\r | |
153 | #define EFI_TIMER_UNIT_1MS (1000 * 10)\r | |
154 | #define EBC_VM_PERIODIC_CALLBACK_RATE (1000 * EFI_TIMER_UNIT_1MS)\r | |
155 | #define STACK_POOL_SIZE (1024 * 1020)\r | |
156 | #define MAX_STACK_NUM 4\r | |
157 | \r | |
158 | //\r | |
159 | // External low level functions that are native-processor dependent\r | |
160 | //\r | |
161 | /**\r | |
162 | The VM thunk code stuffs an EBC entry point into a processor\r | |
163 | register. Since we can't use inline assembly to get it from\r | |
164 | the interpreter C code, stuff it into the return value\r | |
165 | register and return.\r | |
166 | \r | |
167 | @return The contents of the register in which the entry point is passed.\r | |
168 | \r | |
169 | **/\r | |
170 | UINTN\r | |
171 | EFIAPI\r | |
172 | EbcLLGetEbcEntryPoint (\r | |
173 | VOID\r | |
174 | );\r | |
175 | \r | |
176 | /**\r | |
177 | Returns the caller's value of the stack pointer.\r | |
178 | \r | |
179 | We adjust it by 4 here because when they called us, the return address\r | |
180 | is put on the stack, thereby lowering it by 4 bytes.\r | |
181 | \r | |
182 | @return The current value of the stack pointer for the caller.\r | |
183 | \r | |
184 | **/\r | |
185 | UINTN\r | |
186 | EFIAPI\r | |
187 | EbcLLGetStackPointer (\r | |
188 | VOID\r | |
189 | );\r | |
190 | \r | |
191 | /**\r | |
192 | This function is called to execute an EBC CALLEX instruction.\r | |
193 | This instruction requires that we thunk out to external native\r | |
194 | code. For x64, we switch stacks, copy the arguments to the stack\r | |
195 | and jump to the specified function.\r | |
196 | On return, we restore the stack pointer to its original location.\r | |
197 | Destroys no working registers.\r | |
198 | \r | |
199 | @param CallAddr The function address.\r | |
200 | @param EbcSp The new EBC stack pointer.\r | |
201 | @param FramePtr The frame pointer.\r | |
202 | \r | |
203 | **/\r | |
204 | VOID\r | |
205 | EFIAPI\r | |
206 | EbcLLCALLEXNative (\r | |
207 | IN UINTN CallAddr,\r | |
208 | IN UINTN EbcSp,\r | |
209 | IN VOID *FramePtr\r | |
210 | );\r | |
211 | \r | |
212 | /**\r | |
213 | This function is called to execute an EBC CALLEX instruction.\r | |
214 | The function check the callee's content to see whether it is common native\r | |
215 | code or a thunk to another piece of EBC code.\r | |
216 | If the callee is common native code, use EbcLLCAllEXASM to manipulate,\r | |
217 | otherwise, set the VM->IP to target EBC code directly to avoid another VM\r | |
218 | be startup which cost time and stack space.\r | |
219 | \r | |
220 | @param VmPtr Pointer to a VM context.\r | |
221 | @param FuncAddr Callee's address\r | |
222 | @param NewStackPointer New stack pointer after the call\r | |
223 | @param FramePtr New frame pointer after the call\r | |
224 | @param Size The size of call instruction\r | |
225 | \r | |
226 | **/\r | |
227 | VOID\r | |
228 | EbcLLCALLEX (\r | |
229 | IN VM_CONTEXT *VmPtr,\r | |
230 | IN UINTN FuncAddr,\r | |
231 | IN UINTN NewStackPointer,\r | |
232 | IN VOID *FramePtr,\r | |
233 | IN UINT8 Size\r | |
234 | );\r | |
235 | \r | |
236 | /**\r | |
237 | When EBC calls native, on return the VM has to stuff the return\r | |
238 | value into a VM register. It's assumed here that the value is still\r | |
239 | in the register, so simply return and the caller should get the\r | |
240 | return result properly.\r | |
241 | \r | |
242 | @return The unmodified value returned by the native code.\r | |
243 | \r | |
244 | **/\r | |
245 | INT64\r | |
246 | EFIAPI\r | |
247 | EbcLLGetReturnValue (\r | |
248 | VOID\r | |
249 | );\r | |
250 | \r | |
251 | /**\r | |
252 | Returns the stack index and buffer assosicated with the Handle parameter.\r | |
253 | \r | |
254 | @param Handle The EFI handle as the index to the EBC stack.\r | |
255 | @param StackBuffer A pointer to hold the returned stack buffer.\r | |
256 | @param BufferIndex A pointer to hold the returned stack index.\r | |
257 | \r | |
258 | @retval EFI_OUT_OF_RESOURCES The Handle parameter does not correspond to any\r | |
259 | existing EBC stack.\r | |
260 | @retval EFI_SUCCESS The stack index and buffer were found and\r | |
261 | returned to the caller.\r | |
262 | \r | |
263 | **/\r | |
264 | EFI_STATUS\r | |
265 | GetEBCStack(\r | |
266 | IN EFI_HANDLE Handle,\r | |
267 | OUT VOID **StackBuffer,\r | |
268 | OUT UINTN *BufferIndex\r | |
269 | );\r | |
270 | \r | |
271 | /**\r | |
272 | Returns from the EBC stack by stack Index.\r | |
273 | \r | |
274 | @param Index Specifies which EBC stack to return from.\r | |
275 | \r | |
276 | @retval EFI_SUCCESS The function completed successfully.\r | |
277 | \r | |
278 | **/\r | |
279 | EFI_STATUS\r | |
280 | ReturnEBCStack(\r | |
281 | IN UINTN Index\r | |
282 | );\r | |
283 | \r | |
284 | /**\r | |
285 | Allocates memory to hold all the EBC stacks.\r | |
286 | \r | |
287 | @retval EFI_SUCCESS The EBC stacks were allocated successfully.\r | |
288 | @retval EFI_OUT_OF_RESOURCES Not enough memory available for EBC stacks.\r | |
289 | \r | |
290 | **/\r | |
291 | EFI_STATUS\r | |
292 | InitEBCStack (\r | |
293 | VOID\r | |
294 | );\r | |
295 | \r | |
296 | /**\r | |
297 | Free all EBC stacks allocated before.\r | |
298 | \r | |
299 | @retval EFI_SUCCESS All the EBC stacks were freed.\r | |
300 | \r | |
301 | **/\r | |
302 | EFI_STATUS\r | |
303 | FreeEBCStack(\r | |
304 | VOID\r | |
305 | );\r | |
306 | \r | |
307 | /**\r | |
308 | Returns from the EBC stack associated with the Handle parameter.\r | |
309 | \r | |
310 | @param Handle Specifies the EFI handle to find the EBC stack with.\r | |
311 | \r | |
312 | @retval EFI_SUCCESS The function completed successfully.\r | |
313 | \r | |
314 | **/\r | |
315 | EFI_STATUS\r | |
316 | ReturnEBCStackByHandle(\r | |
317 | IN EFI_HANDLE Handle\r | |
318 | );\r | |
319 | \r | |
320 | \r | |
321 | //\r | |
322 | // Defines for a simple EBC debugger interface\r | |
323 | //\r | |
324 | typedef struct _EFI_EBC_SIMPLE_DEBUGGER_PROTOCOL EFI_EBC_SIMPLE_DEBUGGER_PROTOCOL;\r | |
325 | \r | |
326 | #define EFI_EBC_SIMPLE_DEBUGGER_PROTOCOL_GUID \\r | |
327 | { \\r | |
328 | 0x2a72d11e, 0x7376, 0x40f6, { 0x9c, 0x68, 0x23, 0xfa, 0x2f, 0xe3, 0x63, 0xf1 } \\r | |
329 | }\r | |
330 | \r | |
331 | typedef\r | |
332 | EFI_STATUS\r | |
333 | (*EBC_DEBUGGER_SIGNAL_EXCEPTION) (\r | |
334 | IN EFI_EBC_SIMPLE_DEBUGGER_PROTOCOL *This,\r | |
335 | IN VM_CONTEXT *VmPtr,\r | |
336 | IN EFI_EXCEPTION_TYPE ExceptionType\r | |
337 | );\r | |
338 | \r | |
339 | typedef\r | |
340 | VOID\r | |
341 | (*EBC_DEBUGGER_DEBUG) (\r | |
342 | IN EFI_EBC_SIMPLE_DEBUGGER_PROTOCOL *This,\r | |
343 | IN VM_CONTEXT *VmPtr\r | |
344 | );\r | |
345 | \r | |
346 | typedef\r | |
347 | UINT32\r | |
348 | (*EBC_DEBUGGER_DASM) (\r | |
349 | IN EFI_EBC_SIMPLE_DEBUGGER_PROTOCOL *This,\r | |
350 | IN VM_CONTEXT *VmPtr,\r | |
351 | IN UINT16 *DasmString OPTIONAL,\r | |
352 | IN UINT32 DasmStringSize\r | |
353 | );\r | |
354 | \r | |
355 | //\r | |
356 | // This interface allows you to configure the EBC debug support\r | |
357 | // driver. For example, turn on or off saving and printing of\r | |
358 | // delta VM even if called. Or to even disable the entire interface,\r | |
359 | // in which case all functions become no-ops.\r | |
360 | //\r | |
361 | typedef\r | |
362 | EFI_STATUS\r | |
363 | (*EBC_DEBUGGER_CONFIGURE) (\r | |
364 | IN EFI_EBC_SIMPLE_DEBUGGER_PROTOCOL *This,\r | |
365 | IN UINT32 ConfigId,\r | |
366 | IN UINTN ConfigValue\r | |
367 | );\r | |
368 | \r | |
369 | //\r | |
370 | // Prototype for the actual EBC debug support protocol interface\r | |
371 | //\r | |
372 | struct _EFI_EBC_SIMPLE_DEBUGGER_PROTOCOL {\r | |
373 | EBC_DEBUGGER_DEBUG Debugger;\r | |
374 | EBC_DEBUGGER_SIGNAL_EXCEPTION SignalException;\r | |
375 | EBC_DEBUGGER_DASM Dasm;\r | |
376 | EBC_DEBUGGER_CONFIGURE Configure;\r | |
377 | };\r | |
378 | \r | |
379 | typedef struct {\r | |
380 | EFI_EBC_PROTOCOL *This;\r | |
381 | VOID *EntryPoint;\r | |
382 | EFI_HANDLE ImageHandle;\r | |
383 | VM_CONTEXT VmContext;\r | |
384 | } EFI_EBC_THUNK_DATA;\r | |
385 | \r | |
386 | #define EBC_PROTOCOL_PRIVATE_DATA_SIGNATURE SIGNATURE_32 ('e', 'b', 'c', 'p')\r | |
387 | \r | |
388 | \r | |
389 | #define EBC_PROTOCOL_PRIVATE_DATA_FROM_THIS(a) \\r | |
390 | CR(a, EBC_PROTOCOL_PRIVATE_DATA, EbcProtocol, EBC_PROTOCOL_PRIVATE_DATA_SIGNATURE)\r | |
391 | \r | |
392 | \r | |
393 | #endif // #ifndef _EBC_INT_H_\r |