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Add EBC, FTW, Crc32SectionExtract, NullMemoryTest modules.
[mirror_edk2.git] / MdeModulePkg / Universal / Ebc / Dxe / Ipf / EbcSupport.c
1 /*++
2
3 Copyright (c) 2006, Intel Corporation
4 All rights reserved. This program and the accompanying materials
5 are licensed and made available under the terms and conditions of the BSD License
6 which accompanies this distribution. The full text of the license may be found at
7 http://opensource.org/licenses/bsd-license.php
8
9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
11
12 Module Name:
13
14 EbcSupport.c
15
16 Abstract:
17
18 This module contains EBC support routines that are customized based on
19 the target processor.
20
21 --*/
22
23 #include "EbcInt.h"
24 #include "EbcExecute.h"
25 #include "EbcSupport.h"
26
27 STATIC
28 EFI_STATUS
29 WriteBundle (
30 IN VOID *MemPtr,
31 IN UINT8 Template,
32 IN UINT64 Slot0,
33 IN UINT64 Slot1,
34 IN UINT64 Slot2
35 );
36
37 STATIC
38 VOID
39 PushU64 (
40 VM_CONTEXT *VmPtr,
41 UINT64 Arg
42 )
43 {
44 //
45 // Advance the VM stack down, and then copy the argument to the stack.
46 // Hope it's aligned.
47 //
48 VmPtr->R[0] -= sizeof (UINT64);
49 *(UINT64 *) VmPtr->R[0] = Arg;
50 }
51
52 STATIC
53 UINT64
54 EbcInterpret (
55 UINT64 Arg1,
56 ...
57 )
58 {
59 //
60 // Create a new VM context on the stack
61 //
62 VM_CONTEXT VmContext;
63 UINTN Addr;
64 EFI_STATUS Status;
65 UINTN StackIndex;
66 VA_LIST List;
67 UINT64 Arg2;
68 UINT64 Arg3;
69 UINT64 Arg4;
70 UINT64 Arg5;
71 UINT64 Arg6;
72 UINT64 Arg7;
73 UINT64 Arg8;
74 UINT64 Arg9;
75 UINT64 Arg10;
76 UINT64 Arg11;
77 UINT64 Arg12;
78 UINT64 Arg13;
79 UINT64 Arg14;
80 UINT64 Arg15;
81 UINT64 Arg16;
82 //
83 // Get the EBC entry point from the processor register. Make sure you don't
84 // call any functions before this or you could mess up the register the
85 // entry point is passed in.
86 //
87 Addr = EbcLLGetEbcEntryPoint ();
88 //
89 // Need the args off the stack.
90 //
91 VA_START (List, Arg1);
92 Arg2 = VA_ARG (List, UINT64);
93 Arg3 = VA_ARG (List, UINT64);
94 Arg4 = VA_ARG (List, UINT64);
95 Arg5 = VA_ARG (List, UINT64);
96 Arg6 = VA_ARG (List, UINT64);
97 Arg7 = VA_ARG (List, UINT64);
98 Arg8 = VA_ARG (List, UINT64);
99 Arg9 = VA_ARG (List, UINT64);
100 Arg10 = VA_ARG (List, UINT64);
101 Arg11 = VA_ARG (List, UINT64);
102 Arg12 = VA_ARG (List, UINT64);
103 Arg13 = VA_ARG (List, UINT64);
104 Arg14 = VA_ARG (List, UINT64);
105 Arg15 = VA_ARG (List, UINT64);
106 Arg16 = VA_ARG (List, UINT64);
107 //
108 // Now clear out our context
109 //
110 ZeroMem ((VOID *) &VmContext, sizeof (VM_CONTEXT));
111 //
112 // Set the VM instruction pointer to the correct location in memory.
113 //
114 VmContext.Ip = (VMIP) Addr;
115 //
116 // Initialize the stack pointer for the EBC. Get the current system stack
117 // pointer and adjust it down by the max needed for the interpreter.
118 //
119 //
120 // NOTE: Eventually we should have the interpreter allocate memory
121 // for stack space which it will use during its execution. This
122 // would likely improve performance because the interpreter would
123 // no longer be required to test each memory access and adjust
124 // those reading from the stack gap.
125 //
126 // For IPF, the stack looks like (assuming 10 args passed)
127 // arg10
128 // arg9 (Bottom of high stack)
129 // [ stack gap for interpreter execution ]
130 // [ magic value for detection of stack corruption ]
131 // arg8 (Top of low stack)
132 // arg7....
133 // arg1
134 // [ 64-bit return address ]
135 // [ ebc stack ]
136 // If the EBC accesses memory in the stack gap, then we assume that it's
137 // actually trying to access args9 and greater. Therefore we need to
138 // adjust memory accesses in this region to point above the stack gap.
139 //
140 //
141 // Now adjust the EBC stack pointer down to leave a gap for interpreter
142 // execution. Then stuff a magic value there.
143 //
144
145 Status = GetEBCStack((EFI_HANDLE)(UINTN)-1, &VmContext.StackPool, &StackIndex);
146 if (EFI_ERROR(Status)) {
147 return Status;
148 }
149 VmContext.StackTop = (UINT8*)VmContext.StackPool + (STACK_REMAIN_SIZE);
150 VmContext.R[0] = (UINT64) ((UINT8*)VmContext.StackPool + STACK_POOL_SIZE);
151 VmContext.HighStackBottom = (UINTN) VmContext.R[0];
152 VmContext.R[0] -= sizeof (UINTN);
153
154
155 PushU64 (&VmContext, (UINT64) VM_STACK_KEY_VALUE);
156 VmContext.StackMagicPtr = (UINTN *) VmContext.R[0];
157 VmContext.LowStackTop = (UINTN) VmContext.R[0];
158 //
159 // Push the EBC arguments on the stack. Does not matter that they may not
160 // all be valid.
161 //
162 PushU64 (&VmContext, Arg16);
163 PushU64 (&VmContext, Arg15);
164 PushU64 (&VmContext, Arg14);
165 PushU64 (&VmContext, Arg13);
166 PushU64 (&VmContext, Arg12);
167 PushU64 (&VmContext, Arg11);
168 PushU64 (&VmContext, Arg10);
169 PushU64 (&VmContext, Arg9);
170 PushU64 (&VmContext, Arg8);
171 PushU64 (&VmContext, Arg7);
172 PushU64 (&VmContext, Arg6);
173 PushU64 (&VmContext, Arg5);
174 PushU64 (&VmContext, Arg4);
175 PushU64 (&VmContext, Arg3);
176 PushU64 (&VmContext, Arg2);
177 PushU64 (&VmContext, Arg1);
178 //
179 // Push a bogus return address on the EBC stack because the
180 // interpreter expects one there. For stack alignment purposes on IPF,
181 // EBC return addresses are always 16 bytes. Push a bogus value as well.
182 //
183 PushU64 (&VmContext, 0);
184 PushU64 (&VmContext, 0xDEADBEEFDEADBEEF);
185 VmContext.StackRetAddr = (UINT64) VmContext.R[0];
186 //
187 // Begin executing the EBC code
188 //
189 EbcExecute (&VmContext);
190 //
191 // Return the value in R[7] unless there was an error
192 //
193 ReturnEBCStack(StackIndex);
194 return (UINT64) VmContext.R[7];
195 }
196
197 STATIC
198 UINT64
199 ExecuteEbcImageEntryPoint (
200 IN EFI_HANDLE ImageHandle,
201 IN EFI_SYSTEM_TABLE *SystemTable
202 )
203 /*++
204
205 Routine Description:
206
207 IPF implementation.
208
209 Begin executing an EBC image. The address of the entry point is passed
210 in via a processor register, so we'll need to make a call to get the
211 value.
212
213 Arguments:
214
215 ImageHandle - image handle for the EBC application we're executing
216 SystemTable - standard system table passed into an driver's entry point
217
218 Returns:
219
220 The value returned by the EBC application we're going to run.
221
222 --*/
223 {
224 //
225 // Create a new VM context on the stack
226 //
227 VM_CONTEXT VmContext;
228 UINTN Addr;
229 EFI_STATUS Status;
230 UINTN StackIndex;
231
232 //
233 // Get the EBC entry point from the processor register. Make sure you don't
234 // call any functions before this or you could mess up the register the
235 // entry point is passed in.
236 //
237 Addr = EbcLLGetEbcEntryPoint ();
238
239 //
240 // Now clear out our context
241 //
242 ZeroMem ((VOID *) &VmContext, sizeof (VM_CONTEXT));
243
244 //
245 // Save the image handle so we can track the thunks created for this image
246 //
247 VmContext.ImageHandle = ImageHandle;
248 VmContext.SystemTable = SystemTable;
249
250 //
251 // Set the VM instruction pointer to the correct location in memory.
252 //
253 VmContext.Ip = (VMIP) Addr;
254
255 //
256 // Get the stack pointer. This is the bottom of the upper stack.
257 //
258 Addr = EbcLLGetStackPointer ();
259
260 Status = GetEBCStack(ImageHandle, &VmContext.StackPool, &StackIndex);
261 if (EFI_ERROR(Status)) {
262 return Status;
263 }
264 VmContext.StackTop = (UINT8*)VmContext.StackPool + (STACK_REMAIN_SIZE);
265 VmContext.R[0] = (UINT64) ((UINT8*)VmContext.StackPool + STACK_POOL_SIZE);
266 VmContext.HighStackBottom = (UINTN) VmContext.R[0];
267 VmContext.R[0] -= sizeof (UINTN);
268
269
270 //
271 // Allocate stack space for the interpreter. Then put a magic value
272 // at the bottom so we can detect stack corruption.
273 //
274 PushU64 (&VmContext, (UINT64) VM_STACK_KEY_VALUE);
275 VmContext.StackMagicPtr = (UINTN *) (UINTN) VmContext.R[0];
276
277 //
278 // When we thunk to external native code, we copy the last 8 qwords from
279 // the EBC stack into the processor registers, and adjust the stack pointer
280 // up. If the caller is not passing 8 parameters, then we've moved the
281 // stack pointer up into the stack gap. If this happens, then the caller
282 // can mess up the stack gap contents (in particular our magic value).
283 // Therefore, leave another gap below the magic value. Pick 10 qwords down,
284 // just as a starting point.
285 //
286 VmContext.R[0] -= 10 * sizeof (UINT64);
287
288 //
289 // Align the stack pointer such that after pushing the system table,
290 // image handle, and return address on the stack, it's aligned on a 16-byte
291 // boundary as required for IPF.
292 //
293 VmContext.R[0] &= (INT64)~0x0f;
294 VmContext.LowStackTop = (UINTN) VmContext.R[0];
295 //
296 // Simply copy the image handle and system table onto the EBC stack.
297 // Greatly simplifies things by not having to spill the args
298 //
299 PushU64 (&VmContext, (UINT64) SystemTable);
300 PushU64 (&VmContext, (UINT64) ImageHandle);
301
302 //
303 // Interpreter assumes 64-bit return address is pushed on the stack.
304 // IPF does not do this so pad the stack accordingly. Also, a
305 // "return address" is 16 bytes as required for IPF stack alignments.
306 //
307 PushU64 (&VmContext, (UINT64) 0);
308 PushU64 (&VmContext, (UINT64) 0x1234567887654321);
309 VmContext.StackRetAddr = (UINT64) VmContext.R[0];
310
311 //
312 // Begin executing the EBC code
313 //
314 EbcExecute (&VmContext);
315
316 //
317 // Return the value in R[7] unless there was an error
318 //
319 ReturnEBCStack(StackIndex);
320 return (UINT64) VmContext.R[7];
321 }
322
323 EFI_STATUS
324 EbcCreateThunks (
325 IN EFI_HANDLE ImageHandle,
326 IN VOID *EbcEntryPoint,
327 OUT VOID **Thunk,
328 IN UINT32 Flags
329 )
330 /*++
331
332 Routine Description:
333
334 Create thunks for an EBC image entry point, or an EBC protocol service.
335
336 Arguments:
337
338 ImageHandle - Image handle for the EBC image. If not null, then we're
339 creating a thunk for an image entry point.
340 EbcEntryPoint - Address of the EBC code that the thunk is to call
341 Thunk - Returned thunk we create here
342 Flags - Flags indicating options for creating the thunk
343
344 Returns:
345
346 Standard EFI status.
347
348 --*/
349 {
350 UINT8 *Ptr;
351 UINT8 *ThunkBase;
352 UINT64 Addr;
353 UINT64 Code[3]; // Code in a bundle
354 UINT64 RegNum; // register number for MOVL
355 UINT64 I; // bits of MOVL immediate data
356 UINT64 Ic; // bits of MOVL immediate data
357 UINT64 Imm5c; // bits of MOVL immediate data
358 UINT64 Imm9d; // bits of MOVL immediate data
359 UINT64 Imm7b; // bits of MOVL immediate data
360 UINT64 Br; // branch register for loading and jumping
361 UINT64 *Data64Ptr;
362 UINT32 ThunkSize;
363 UINT32 Size;
364
365 //
366 // Check alignment of pointer to EBC code, which must always be aligned
367 // on a 2-byte boundary.
368 //
369 if ((UINT32) (UINTN) EbcEntryPoint & 0x01) {
370 return EFI_INVALID_PARAMETER;
371 }
372 //
373 // Allocate memory for the thunk. Make the (most likely incorrect) assumption
374 // that the returned buffer is not aligned, so round up to the next
375 // alignment size.
376 //
377 Size = EBC_THUNK_SIZE + EBC_THUNK_ALIGNMENT - 1;
378 ThunkSize = Size;
379 Ptr = AllocatePool (Size);
380
381 if (Ptr == NULL) {
382 return EFI_OUT_OF_RESOURCES;
383 }
384 //
385 // Save the start address of the buffer.
386 //
387 ThunkBase = Ptr;
388
389 //
390 // Make sure it's aligned for code execution. If not, then
391 // round up.
392 //
393 if ((UINT32) (UINTN) Ptr & (EBC_THUNK_ALIGNMENT - 1)) {
394 Ptr = (UINT8 *) (((UINTN) Ptr + (EBC_THUNK_ALIGNMENT - 1)) &~ (UINT64) (EBC_THUNK_ALIGNMENT - 1));
395 }
396 //
397 // Return the pointer to the thunk to the caller to user as the
398 // image entry point.
399 //
400 *Thunk = (VOID *) Ptr;
401
402 //
403 // Clear out the thunk entry
404 // ZeroMem(Ptr, Size);
405 //
406 // For IPF, when you do a call via a function pointer, the function pointer
407 // actually points to a function descriptor which consists of a 64-bit
408 // address of the function, followed by a 64-bit gp for the function being
409 // called. See the the Software Conventions and Runtime Architecture Guide
410 // for details.
411 // So first off in our thunk, create a descriptor for our actual thunk code.
412 // This means we need to create a pointer to the thunk code (which follows
413 // the descriptor we're going to create), followed by the gp of the Vm
414 // interpret function we're going to eventually execute.
415 //
416 Data64Ptr = (UINT64 *) Ptr;
417
418 //
419 // Write the function's entry point (which is our thunk code that follows
420 // this descriptor we're creating).
421 //
422 *Data64Ptr = (UINT64) (Data64Ptr + 2);
423 //
424 // Get the gp from the descriptor for EbcInterpret and stuff it in our thunk
425 // descriptor.
426 //
427 *(Data64Ptr + 1) = *(UINT64 *) ((UINT64 *) (UINTN) EbcInterpret + 1);
428 //
429 // Advance our thunk data pointer past the descriptor. Since the
430 // descriptor consists of 16 bytes, the pointer is still aligned for
431 // IPF code execution (on 16-byte boundary).
432 //
433 Ptr += sizeof (UINT64) * 2;
434
435 //
436 // *************************** MAGIC BUNDLE ********************************
437 //
438 // Write magic code bundle for: movl r8 = 0xca112ebcca112ebc to help the VM
439 // to recognize it is a thunk.
440 //
441 Addr = (UINT64) 0xCA112EBCCA112EBC;
442
443 //
444 // Now generate the code bytes. First is nop.m 0x0
445 //
446 Code[0] = OPCODE_NOP;
447
448 //
449 // Next is simply Addr[62:22] (41 bits) of the address
450 //
451 Code[1] = RShiftU64 (Addr, 22) & 0x1ffffffffff;
452
453 //
454 // Extract bits from the address for insertion into the instruction
455 // i = Addr[63:63]
456 //
457 I = RShiftU64 (Addr, 63) & 0x01;
458 //
459 // ic = Addr[21:21]
460 //
461 Ic = RShiftU64 (Addr, 21) & 0x01;
462 //
463 // imm5c = Addr[20:16] for 5 bits
464 //
465 Imm5c = RShiftU64 (Addr, 16) & 0x1F;
466 //
467 // imm9d = Addr[15:7] for 9 bits
468 //
469 Imm9d = RShiftU64 (Addr, 7) & 0x1FF;
470 //
471 // imm7b = Addr[6:0] for 7 bits
472 //
473 Imm7b = Addr & 0x7F;
474
475 //
476 // The EBC entry point will be put into r8, so r8 can be used here
477 // temporary. R8 is general register and is auto-serialized.
478 //
479 RegNum = 8;
480
481 //
482 // Next is jumbled data, including opcode and rest of address
483 //
484 Code[2] = LShiftU64 (Imm7b, 13);
485 Code[2] = Code[2] | LShiftU64 (0x00, 20); // vc
486 Code[2] = Code[2] | LShiftU64 (Ic, 21);
487 Code[2] = Code[2] | LShiftU64 (Imm5c, 22);
488 Code[2] = Code[2] | LShiftU64 (Imm9d, 27);
489 Code[2] = Code[2] | LShiftU64 (I, 36);
490 Code[2] = Code[2] | LShiftU64 ((UINT64)MOVL_OPCODE, 37);
491 Code[2] = Code[2] | LShiftU64 ((RegNum & 0x7F), 6);
492
493 WriteBundle ((VOID *) Ptr, 0x05, Code[0], Code[1], Code[2]);
494
495 //
496 // *************************** FIRST BUNDLE ********************************
497 //
498 // Write code bundle for: movl r8 = EBC_ENTRY_POINT so we pass
499 // the ebc entry point in to the interpreter function via a processor
500 // register.
501 // Note -- we could easily change this to pass in a pointer to a structure
502 // that contained, among other things, the EBC image's entry point. But
503 // for now pass it directly.
504 //
505 Ptr += 16;
506 Addr = (UINT64) EbcEntryPoint;
507
508 //
509 // Now generate the code bytes. First is nop.m 0x0
510 //
511 Code[0] = OPCODE_NOP;
512
513 //
514 // Next is simply Addr[62:22] (41 bits) of the address
515 //
516 Code[1] = RShiftU64 (Addr, 22) & 0x1ffffffffff;
517
518 //
519 // Extract bits from the address for insertion into the instruction
520 // i = Addr[63:63]
521 //
522 I = RShiftU64 (Addr, 63) & 0x01;
523 //
524 // ic = Addr[21:21]
525 //
526 Ic = RShiftU64 (Addr, 21) & 0x01;
527 //
528 // imm5c = Addr[20:16] for 5 bits
529 //
530 Imm5c = RShiftU64 (Addr, 16) & 0x1F;
531 //
532 // imm9d = Addr[15:7] for 9 bits
533 //
534 Imm9d = RShiftU64 (Addr, 7) & 0x1FF;
535 //
536 // imm7b = Addr[6:0] for 7 bits
537 //
538 Imm7b = Addr & 0x7F;
539
540 //
541 // Put the EBC entry point in r8, which is the location of the return value
542 // for functions.
543 //
544 RegNum = 8;
545
546 //
547 // Next is jumbled data, including opcode and rest of address
548 //
549 Code[2] = LShiftU64 (Imm7b, 13);
550 Code[2] = Code[2] | LShiftU64 (0x00, 20); // vc
551 Code[2] = Code[2] | LShiftU64 (Ic, 21);
552 Code[2] = Code[2] | LShiftU64 (Imm5c, 22);
553 Code[2] = Code[2] | LShiftU64 (Imm9d, 27);
554 Code[2] = Code[2] | LShiftU64 (I, 36);
555 Code[2] = Code[2] | LShiftU64 ((UINT64)MOVL_OPCODE, 37);
556 Code[2] = Code[2] | LShiftU64 ((RegNum & 0x7F), 6);
557
558 WriteBundle ((VOID *) Ptr, 0x05, Code[0], Code[1], Code[2]);
559
560 //
561 // *************************** NEXT BUNDLE *********************************
562 //
563 // Write code bundle for:
564 // movl rx = offset_of(EbcInterpret|ExecuteEbcImageEntryPoint)
565 //
566 // Advance pointer to next bundle, then compute the offset from this bundle
567 // to the address of the entry point of the interpreter.
568 //
569 Ptr += 16;
570 if (Flags & FLAG_THUNK_ENTRY_POINT) {
571 Addr = (UINT64) ExecuteEbcImageEntryPoint;
572 } else {
573 Addr = (UINT64) EbcInterpret;
574 }
575 //
576 // Indirection on Itanium-based systems
577 //
578 Addr = *(UINT64 *) Addr;
579
580 //
581 // Now write the code to load the offset into a register
582 //
583 Code[0] = OPCODE_NOP;
584
585 //
586 // Next is simply Addr[62:22] (41 bits) of the address
587 //
588 Code[1] = RShiftU64 (Addr, 22) & 0x1ffffffffff;
589
590 //
591 // Extract bits from the address for insertion into the instruction
592 // i = Addr[63:63]
593 //
594 I = RShiftU64 (Addr, 63) & 0x01;
595 //
596 // ic = Addr[21:21]
597 //
598 Ic = RShiftU64 (Addr, 21) & 0x01;
599 //
600 // imm5c = Addr[20:16] for 5 bits
601 //
602 Imm5c = RShiftU64 (Addr, 16) & 0x1F;
603 //
604 // imm9d = Addr[15:7] for 9 bits
605 //
606 Imm9d = RShiftU64 (Addr, 7) & 0x1FF;
607 //
608 // imm7b = Addr[6:0] for 7 bits
609 //
610 Imm7b = Addr & 0x7F;
611
612 //
613 // Put it in r31, a scratch register
614 //
615 RegNum = 31;
616
617 //
618 // Next is jumbled data, including opcode and rest of address
619 //
620 Code[2] = LShiftU64(Imm7b, 13);
621 Code[2] = Code[2] | LShiftU64 (0x00, 20); // vc
622 Code[2] = Code[2] | LShiftU64 (Ic, 21);
623 Code[2] = Code[2] | LShiftU64 (Imm5c, 22);
624 Code[2] = Code[2] | LShiftU64 (Imm9d, 27);
625 Code[2] = Code[2] | LShiftU64 (I, 36);
626 Code[2] = Code[2] | LShiftU64 ((UINT64)MOVL_OPCODE, 37);
627 Code[2] = Code[2] | LShiftU64 ((RegNum & 0x7F), 6);
628
629 WriteBundle ((VOID *) Ptr, 0x05, Code[0], Code[1], Code[2]);
630
631 //
632 // *************************** NEXT BUNDLE *********************************
633 //
634 // Load branch register with EbcInterpret() function offset from the bundle
635 // address: mov b6 = RegNum
636 //
637 // See volume 3 page 4-29 of the Arch. Software Developer's Manual.
638 //
639 // Advance pointer to next bundle
640 //
641 Ptr += 16;
642 Code[0] = OPCODE_NOP;
643 Code[1] = OPCODE_NOP;
644 Code[2] = OPCODE_MOV_BX_RX;
645
646 //
647 // Pick a branch register to use. Then fill in the bits for the branch
648 // register and user register (same user register as previous bundle).
649 //
650 Br = 6;
651 Code[2] |= LShiftU64 (Br, 6);
652 Code[2] |= LShiftU64 (RegNum, 13);
653 WriteBundle ((VOID *) Ptr, 0x0d, Code[0], Code[1], Code[2]);
654
655 //
656 // *************************** NEXT BUNDLE *********************************
657 //
658 // Now do the branch: (p0) br.cond.sptk.few b6
659 //
660 // Advance pointer to next bundle.
661 // Fill in the bits for the branch register (same reg as previous bundle)
662 //
663 Ptr += 16;
664 Code[0] = OPCODE_NOP;
665 Code[1] = OPCODE_NOP;
666 Code[2] = OPCODE_BR_COND_SPTK_FEW;
667 Code[2] |= LShiftU64 (Br, 13);
668 WriteBundle ((VOID *) Ptr, 0x1d, Code[0], Code[1], Code[2]);
669
670 //
671 // Add the thunk to our list of allocated thunks so we can do some cleanup
672 // when the image is unloaded. Do this last since the Add function flushes
673 // the instruction cache for us.
674 //
675 EbcAddImageThunk (ImageHandle, (VOID *) ThunkBase, ThunkSize);
676
677 //
678 // Done
679 //
680 return EFI_SUCCESS;
681 }
682
683 STATIC
684 EFI_STATUS
685 WriteBundle (
686 IN VOID *MemPtr,
687 IN UINT8 Template,
688 IN UINT64 Slot0,
689 IN UINT64 Slot1,
690 IN UINT64 Slot2
691 )
692 /*++
693
694 Routine Description:
695
696 Given raw bytes of Itanium based code, format them into a bundle and
697 write them out.
698
699 Arguments:
700
701 MemPtr - pointer to memory location to write the bundles to
702 Template - 5-bit template
703 Slot0-2 - instruction slot data for the bundle
704
705 Returns:
706
707 EFI_INVALID_PARAMETER - Pointer is not aligned
708 - No more than 5 bits in template
709 - More than 41 bits used in code
710 EFI_SUCCESS - All data is written.
711
712 --*/
713 {
714 UINT8 *BPtr;
715 UINT32 Index;
716 UINT64 Low64;
717 UINT64 High64;
718
719 //
720 // Verify pointer is aligned
721 //
722 if ((UINT64) MemPtr & 0xF) {
723 return EFI_INVALID_PARAMETER;
724 }
725 //
726 // Verify no more than 5 bits in template
727 //
728 if (Template &~0x1F) {
729 return EFI_INVALID_PARAMETER;
730 }
731 //
732 // Verify max of 41 bits used in code
733 //
734 if ((Slot0 | Slot1 | Slot2) &~0x1ffffffffff) {
735 return EFI_INVALID_PARAMETER;
736 }
737
738 Low64 = LShiftU64 (Slot1, 46);
739 Low64 = Low64 | LShiftU64 (Slot0, 5) | Template;
740
741 High64 = RShiftU64 (Slot1, 18);
742 High64 = High64 | LShiftU64 (Slot2, 23);
743
744 //
745 // Now write it all out
746 //
747 BPtr = (UINT8 *) MemPtr;
748 for (Index = 0; Index < 8; Index++) {
749 *BPtr = (UINT8) Low64;
750 Low64 = RShiftU64 (Low64, 8);
751 BPtr++;
752 }
753
754 for (Index = 0; Index < 8; Index++) {
755 *BPtr = (UINT8) High64;
756 High64 = RShiftU64 (High64, 8);
757 BPtr++;
758 }
759
760 return EFI_SUCCESS;
761 }
762
763 VOID
764 EbcLLCALLEX (
765 IN VM_CONTEXT *VmPtr,
766 IN UINTN FuncAddr,
767 IN UINTN NewStackPointer,
768 IN VOID *FramePtr,
769 IN UINT8 Size
770 )
771 /*++
772
773 Routine Description:
774
775 This function is called to execute an EBC CALLEX instruction.
776 The function check the callee's content to see whether it is common native
777 code or a thunk to another piece of EBC code.
778 If the callee is common native code, use EbcLLCAllEXASM to manipulate,
779 otherwise, set the VM->IP to target EBC code directly to avoid another VM
780 be startup which cost time and stack space.
781
782 Arguments:
783
784 VmPtr - Pointer to a VM context.
785 FuncAddr - Callee's address
786 NewStackPointer - New stack pointer after the call
787 FramePtr - New frame pointer after the call
788 Size - The size of call instruction
789
790 Returns:
791
792 None.
793
794 --*/
795 {
796 UINTN IsThunk;
797 UINTN TargetEbcAddr;
798 UINTN CodeOne18;
799 UINTN CodeOne23;
800 UINTN CodeTwoI;
801 UINTN CodeTwoIc;
802 UINTN CodeTwo7b;
803 UINTN CodeTwo5c;
804 UINTN CodeTwo9d;
805 UINTN CalleeAddr;
806
807 IsThunk = 1;
808 TargetEbcAddr = 0;
809
810 //
811 // FuncAddr points to the descriptor of the target instructions.
812 //
813 CalleeAddr = *((UINT64 *)FuncAddr);
814
815 //
816 // Processor specific code to check whether the callee is a thunk to EBC.
817 //
818 if (*((UINT64 *)CalleeAddr) != 0xBCCA000100000005) {
819 IsThunk = 0;
820 goto Action;
821 }
822 if (*((UINT64 *)CalleeAddr + 1) != 0x697623C1004A112E) {
823 IsThunk = 0;
824 goto Action;
825 }
826
827 CodeOne18 = RShiftU64 (*((UINT64 *)CalleeAddr + 2), 46) & 0x3FFFF;
828 CodeOne23 = (*((UINT64 *)CalleeAddr + 3)) & 0x7FFFFF;
829 CodeTwoI = RShiftU64 (*((UINT64 *)CalleeAddr + 3), 59) & 0x1;
830 CodeTwoIc = RShiftU64 (*((UINT64 *)CalleeAddr + 3), 44) & 0x1;
831 CodeTwo7b = RShiftU64 (*((UINT64 *)CalleeAddr + 3), 36) & 0x7F;
832 CodeTwo5c = RShiftU64 (*((UINT64 *)CalleeAddr + 3), 45) & 0x1F;
833 CodeTwo9d = RShiftU64 (*((UINT64 *)CalleeAddr + 3), 50) & 0x1FF;
834
835 TargetEbcAddr = CodeTwo7b;
836 TargetEbcAddr = TargetEbcAddr | LShiftU64 (CodeTwo9d, 7);
837 TargetEbcAddr = TargetEbcAddr | LShiftU64 (CodeTwo5c, 16);
838 TargetEbcAddr = TargetEbcAddr | LShiftU64 (CodeTwoIc, 21);
839 TargetEbcAddr = TargetEbcAddr | LShiftU64 (CodeOne18, 22);
840 TargetEbcAddr = TargetEbcAddr | LShiftU64 (CodeOne23, 40);
841 TargetEbcAddr = TargetEbcAddr | LShiftU64 (CodeTwoI, 63);
842
843 Action:
844 if (IsThunk == 1){
845 //
846 // The callee is a thunk to EBC, adjust the stack pointer down 16 bytes and
847 // put our return address and frame pointer on the VM stack.
848 // Then set the VM's IP to new EBC code.
849 //
850 VmPtr->R[0] -= 8;
851 VmWriteMemN (VmPtr, (UINTN) VmPtr->R[0], (UINTN) FramePtr);
852 VmPtr->FramePtr = (VOID *) (UINTN) VmPtr->R[0];
853 VmPtr->R[0] -= 8;
854 VmWriteMem64 (VmPtr, (UINTN) VmPtr->R[0], (UINT64) (VmPtr->Ip + Size));
855
856 VmPtr->Ip = (VMIP) (UINTN) TargetEbcAddr;
857 } else {
858 //
859 // The callee is not a thunk to EBC, call native code.
860 //
861 EbcLLCALLEXNative (FuncAddr, NewStackPointer, FramePtr);
862
863 //
864 // Get return value and advance the IP.
865 //
866 VmPtr->R[7] = EbcLLGetReturnValue ();
867 VmPtr->Ip += Size;
868 }
869 }
EFI Development Kit II mirror for PVE