LLVM  6.0.0svn
OrcABISupport.cpp
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1 //===------------- OrcABISupport.cpp - ABI specific support code ----------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
11 #include "llvm/ADT/Triple.h"
12 #include "llvm/Support/Process.h"
13 
14 namespace llvm {
15 namespace orc {
16 
17 void OrcAArch64::writeResolverCode(uint8_t *ResolverMem, JITReentryFn ReentryFn,
18  void *CallbackMgr) {
19 
20  const uint32_t ResolverCode[] = {
21  // resolver_entry:
22  0xa9bf47fd, // 0x000: stp x29, x17, [sp, #-16]!
23  0x910003fd, // 0x004: mov x29, sp
24  0xa9bf73fb, // 0x008: stp x27, x28, [sp, #-16]!
25  0xa9bf6bf9, // 0x00c: stp x25, x26, [sp, #-16]!
26  0xa9bf63f7, // 0x010: stp x23, x24, [sp, #-16]!
27  0xa9bf5bf5, // 0x014: stp x21, x22, [sp, #-16]!
28  0xa9bf53f3, // 0x018: stp x19, x20, [sp, #-16]!
29  0xa9bf3fee, // 0x01c: stp x14, x15, [sp, #-16]!
30  0xa9bf37ec, // 0x020: stp x12, x13, [sp, #-16]!
31  0xa9bf2fea, // 0x024: stp x10, x11, [sp, #-16]!
32  0xa9bf27e8, // 0x028: stp x8, x9, [sp, #-16]!
33  0xa9bf1fe6, // 0x02c: stp x6, x7, [sp, #-16]!
34  0xa9bf17e4, // 0x030: stp x4, x5, [sp, #-16]!
35  0xa9bf0fe2, // 0x034: stp x2, x3, [sp, #-16]!
36  0xa9bf07e0, // 0x038: stp x0, x1, [sp, #-16]!
37  0xadbf7ffe, // 0x03c: stp q30, q31, [sp, #-32]!
38  0xadbf77fc, // 0x040: stp q28, q29, [sp, #-32]!
39  0xadbf6ffa, // 0x044: stp q26, q27, [sp, #-32]!
40  0xadbf67f8, // 0x048: stp q24, q25, [sp, #-32]!
41  0xadbf5ff6, // 0x04c: stp q22, q23, [sp, #-32]!
42  0xadbf57f4, // 0x050: stp q20, q21, [sp, #-32]!
43  0xadbf4ff2, // 0x054: stp q18, q19, [sp, #-32]!
44  0xadbf47f0, // 0x058: stp q16, q17, [sp, #-32]!
45  0xadbf3fee, // 0x05c: stp q14, q15, [sp, #-32]!
46  0xadbf37ec, // 0x060: stp q12, q13, [sp, #-32]!
47  0xadbf2fea, // 0x064: stp q10, q11, [sp, #-32]!
48  0xadbf27e8, // 0x068: stp q8, q9, [sp, #-32]!
49  0xadbf1fe6, // 0x06c: stp q6, q7, [sp, #-32]!
50  0xadbf17e4, // 0x070: stp q4, q5, [sp, #-32]!
51  0xadbf0fe2, // 0x074: stp q2, q3, [sp, #-32]!
52  0xadbf07e0, // 0x078: stp q0, q1, [sp, #-32]!
53  0x580004e0, // 0x07c: ldr x0, Lcallbackmgr
54  0xaa1e03e1, // 0x080: mov x1, x30
55  0xd1003021, // 0x084: sub x1, x1, #12
56  0x58000442, // 0x088: ldr x2, Lreentry_fn_ptr
57  0xd63f0040, // 0x08c: blr x2
58  0xaa0003f1, // 0x090: mov x17, x0
59  0xacc107e0, // 0x094: ldp q0, q1, [sp], #32
60  0xacc10fe2, // 0x098: ldp q2, q3, [sp], #32
61  0xacc117e4, // 0x09c: ldp q4, q5, [sp], #32
62  0xacc11fe6, // 0x0a0: ldp q6, q7, [sp], #32
63  0xacc127e8, // 0x0a4: ldp q8, q9, [sp], #32
64  0xacc12fea, // 0x0a8: ldp q10, q11, [sp], #32
65  0xacc137ec, // 0x0ac: ldp q12, q13, [sp], #32
66  0xacc13fee, // 0x0b0: ldp q14, q15, [sp], #32
67  0xacc147f0, // 0x0b4: ldp q16, q17, [sp], #32
68  0xacc14ff2, // 0x0b8: ldp q18, q19, [sp], #32
69  0xacc157f4, // 0x0bc: ldp q20, q21, [sp], #32
70  0xacc15ff6, // 0x0c0: ldp q22, q23, [sp], #32
71  0xacc167f8, // 0x0c4: ldp q24, q25, [sp], #32
72  0xacc16ffa, // 0x0c8: ldp q26, q27, [sp], #32
73  0xacc177fc, // 0x0cc: ldp q28, q29, [sp], #32
74  0xacc17ffe, // 0x0d0: ldp q30, q31, [sp], #32
75  0xa8c107e0, // 0x0d4: ldp x0, x1, [sp], #16
76  0xa8c10fe2, // 0x0d8: ldp x2, x3, [sp], #16
77  0xa8c117e4, // 0x0dc: ldp x4, x5, [sp], #16
78  0xa8c11fe6, // 0x0e0: ldp x6, x7, [sp], #16
79  0xa8c127e8, // 0x0e4: ldp x8, x9, [sp], #16
80  0xa8c12fea, // 0x0e8: ldp x10, x11, [sp], #16
81  0xa8c137ec, // 0x0ec: ldp x12, x13, [sp], #16
82  0xa8c13fee, // 0x0f0: ldp x14, x15, [sp], #16
83  0xa8c153f3, // 0x0f4: ldp x19, x20, [sp], #16
84  0xa8c15bf5, // 0x0f8: ldp x21, x22, [sp], #16
85  0xa8c163f7, // 0x0fc: ldp x23, x24, [sp], #16
86  0xa8c16bf9, // 0x100: ldp x25, x26, [sp], #16
87  0xa8c173fb, // 0x104: ldp x27, x28, [sp], #16
88  0xa8c17bfd, // 0x108: ldp x29, x30, [sp], #16
89  0xd65f0220, // 0x10c: ret x17
90  0x01234567, // 0x110: Lreentry_fn_ptr:
91  0xdeadbeef, // 0x114: .quad 0
92  0x98765432, // 0x118: Lcallbackmgr:
93  0xcafef00d // 0x11c: .quad 0
94  };
95 
96  const unsigned ReentryFnAddrOffset = 0x110;
97  const unsigned CallbackMgrAddrOffset = 0x118;
98 
99  memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode));
100  memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn));
101  memcpy(ResolverMem + CallbackMgrAddrOffset, &CallbackMgr,
102  sizeof(CallbackMgr));
103 }
104 
105 void OrcAArch64::writeTrampolines(uint8_t *TrampolineMem, void *ResolverAddr,
106  unsigned NumTrampolines) {
107 
108  unsigned OffsetToPtr = alignTo(NumTrampolines * TrampolineSize, 8);
109 
110  memcpy(TrampolineMem + OffsetToPtr, &ResolverAddr, sizeof(void *));
111 
112  // OffsetToPtr is actually the offset from the PC for the 2nd instruction, so
113  // subtract 32-bits.
114  OffsetToPtr -= 4;
115 
116  uint32_t *Trampolines = reinterpret_cast<uint32_t *>(TrampolineMem);
117 
118  for (unsigned I = 0; I < NumTrampolines; ++I, OffsetToPtr -= TrampolineSize) {
119  Trampolines[3 * I + 0] = 0xaa1e03f1; // mov x17, x30
120  Trampolines[3 * I + 1] = 0x58000010 | (OffsetToPtr << 3); // adr x16, Lptr
121  Trampolines[3 * I + 2] = 0xd63f0200; // blr x16
122  }
123 
124 }
125 
127  unsigned MinStubs,
128  void *InitialPtrVal) {
129  // Stub format is:
130  //
131  // .section __orc_stubs
132  // stub1:
133  // ldr x0, ptr1 ; PC-rel load of ptr1
134  // br x0 ; Jump to resolver
135  // stub2:
136  // ldr x0, ptr2 ; PC-rel load of ptr2
137  // br x0 ; Jump to resolver
138  //
139  // ...
140  //
141  // .section __orc_ptrs
142  // ptr1:
143  // .quad 0x0
144  // ptr2:
145  // .quad 0x0
146  //
147  // ...
148 
149  const unsigned StubSize = IndirectStubsInfo::StubSize;
150 
151  // Emit at least MinStubs, rounded up to fill the pages allocated.
152  unsigned PageSize = sys::Process::getPageSize();
153  unsigned NumPages = ((MinStubs * StubSize) + (PageSize - 1)) / PageSize;
154  unsigned NumStubs = (NumPages * PageSize) / StubSize;
155 
156  // Allocate memory for stubs and pointers in one call.
157  std::error_code EC;
159  2 * NumPages * PageSize, nullptr,
161 
162  if (EC)
163  return errorCodeToError(EC);
164 
165  // Create separate MemoryBlocks representing the stubs and pointers.
166  sys::MemoryBlock StubsBlock(StubsMem.base(), NumPages * PageSize);
167  sys::MemoryBlock PtrsBlock(static_cast<char *>(StubsMem.base()) +
168  NumPages * PageSize,
169  NumPages * PageSize);
170 
171  // Populate the stubs page stubs and mark it executable.
172  uint64_t *Stub = reinterpret_cast<uint64_t *>(StubsBlock.base());
173  uint64_t PtrOffsetField = static_cast<uint64_t>(NumPages * PageSize)
174  << 3;
175 
176  for (unsigned I = 0; I < NumStubs; ++I)
177  Stub[I] = 0xd61f020058000010 | PtrOffsetField;
178 
179  if (auto EC = sys::Memory::protectMappedMemory(
181  return errorCodeToError(EC);
182 
183  // Initialize all pointers to point at FailureAddress.
184  void **Ptr = reinterpret_cast<void **>(PtrsBlock.base());
185  for (unsigned I = 0; I < NumStubs; ++I)
186  Ptr[I] = InitialPtrVal;
187 
188  StubsInfo = IndirectStubsInfo(NumStubs, std::move(StubsMem));
189 
190  return Error::success();
191 }
192 
193 void OrcX86_64_Base::writeTrampolines(uint8_t *TrampolineMem,
194  void *ResolverAddr,
195  unsigned NumTrampolines) {
196 
197  unsigned OffsetToPtr = NumTrampolines * TrampolineSize;
198 
199  memcpy(TrampolineMem + OffsetToPtr, &ResolverAddr, sizeof(void *));
200 
201  uint64_t *Trampolines = reinterpret_cast<uint64_t *>(TrampolineMem);
202  uint64_t CallIndirPCRel = 0xf1c40000000015ff;
203 
204  for (unsigned I = 0; I < NumTrampolines; ++I, OffsetToPtr -= TrampolineSize)
205  Trampolines[I] = CallIndirPCRel | ((OffsetToPtr - 6) << 16);
206 }
207 
209  unsigned MinStubs,
210  void *InitialPtrVal) {
211  // Stub format is:
212  //
213  // .section __orc_stubs
214  // stub1:
215  // jmpq *ptr1(%rip)
216  // .byte 0xC4 ; <- Invalid opcode padding.
217  // .byte 0xF1
218  // stub2:
219  // jmpq *ptr2(%rip)
220  //
221  // ...
222  //
223  // .section __orc_ptrs
224  // ptr1:
225  // .quad 0x0
226  // ptr2:
227  // .quad 0x0
228  //
229  // ...
230 
231  const unsigned StubSize = IndirectStubsInfo::StubSize;
232 
233  // Emit at least MinStubs, rounded up to fill the pages allocated.
234  unsigned PageSize = sys::Process::getPageSize();
235  unsigned NumPages = ((MinStubs * StubSize) + (PageSize - 1)) / PageSize;
236  unsigned NumStubs = (NumPages * PageSize) / StubSize;
237 
238  // Allocate memory for stubs and pointers in one call.
239  std::error_code EC;
241  2 * NumPages * PageSize, nullptr,
243 
244  if (EC)
245  return errorCodeToError(EC);
246 
247  // Create separate MemoryBlocks representing the stubs and pointers.
248  sys::MemoryBlock StubsBlock(StubsMem.base(), NumPages * PageSize);
249  sys::MemoryBlock PtrsBlock(static_cast<char *>(StubsMem.base()) +
250  NumPages * PageSize,
251  NumPages * PageSize);
252 
253  // Populate the stubs page stubs and mark it executable.
254  uint64_t *Stub = reinterpret_cast<uint64_t *>(StubsBlock.base());
255  uint64_t PtrOffsetField = static_cast<uint64_t>(NumPages * PageSize - 6)
256  << 16;
257  for (unsigned I = 0; I < NumStubs; ++I)
258  Stub[I] = 0xF1C40000000025ff | PtrOffsetField;
259 
260  if (auto EC = sys::Memory::protectMappedMemory(
262  return errorCodeToError(EC);
263 
264  // Initialize all pointers to point at FailureAddress.
265  void **Ptr = reinterpret_cast<void **>(PtrsBlock.base());
266  for (unsigned I = 0; I < NumStubs; ++I)
267  Ptr[I] = InitialPtrVal;
268 
269  StubsInfo = IndirectStubsInfo(NumStubs, std::move(StubsMem));
270 
271  return Error::success();
272 }
273 
274 void OrcX86_64_SysV::writeResolverCode(uint8_t *ResolverMem,
275  JITReentryFn ReentryFn,
276  void *CallbackMgr) {
277 
278  const uint8_t ResolverCode[] = {
279  // resolver_entry:
280  0x55, // 0x00: pushq %rbp
281  0x48, 0x89, 0xe5, // 0x01: movq %rsp, %rbp
282  0x50, // 0x04: pushq %rax
283  0x53, // 0x05: pushq %rbx
284  0x51, // 0x06: pushq %rcx
285  0x52, // 0x07: pushq %rdx
286  0x56, // 0x08: pushq %rsi
287  0x57, // 0x09: pushq %rdi
288  0x41, 0x50, // 0x0a: pushq %r8
289  0x41, 0x51, // 0x0c: pushq %r9
290  0x41, 0x52, // 0x0e: pushq %r10
291  0x41, 0x53, // 0x10: pushq %r11
292  0x41, 0x54, // 0x12: pushq %r12
293  0x41, 0x55, // 0x14: pushq %r13
294  0x41, 0x56, // 0x16: pushq %r14
295  0x41, 0x57, // 0x18: pushq %r15
296  0x48, 0x81, 0xec, 0x08, 0x02, 0x00, 0x00, // 0x1a: subq 0x208, %rsp
297  0x48, 0x0f, 0xae, 0x04, 0x24, // 0x21: fxsave64 (%rsp)
298  0x48, 0xbf, // 0x26: movabsq <CBMgr>, %rdi
299 
300  // 0x28: Callback manager addr.
301  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
302 
303  0x48, 0x8b, 0x75, 0x08, // 0x30: movq 8(%rbp), %rsi
304  0x48, 0x83, 0xee, 0x06, // 0x34: subq $6, %rsi
305  0x48, 0xb8, // 0x38: movabsq <REntry>, %rax
306 
307  // 0x3a: JIT re-entry fn addr:
308  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
309 
310  0xff, 0xd0, // 0x42: callq *%rax
311  0x48, 0x89, 0x45, 0x08, // 0x44: movq %rax, 8(%rbp)
312  0x48, 0x0f, 0xae, 0x0c, 0x24, // 0x48: fxrstor64 (%rsp)
313  0x48, 0x81, 0xc4, 0x08, 0x02, 0x00, 0x00, // 0x4d: addq 0x208, %rsp
314  0x41, 0x5f, // 0x54: popq %r15
315  0x41, 0x5e, // 0x56: popq %r14
316  0x41, 0x5d, // 0x58: popq %r13
317  0x41, 0x5c, // 0x5a: popq %r12
318  0x41, 0x5b, // 0x5c: popq %r11
319  0x41, 0x5a, // 0x5e: popq %r10
320  0x41, 0x59, // 0x60: popq %r9
321  0x41, 0x58, // 0x62: popq %r8
322  0x5f, // 0x64: popq %rdi
323  0x5e, // 0x65: popq %rsi
324  0x5a, // 0x66: popq %rdx
325  0x59, // 0x67: popq %rcx
326  0x5b, // 0x68: popq %rbx
327  0x58, // 0x69: popq %rax
328  0x5d, // 0x6a: popq %rbp
329  0xc3, // 0x6b: retq
330  };
331 
332  const unsigned ReentryFnAddrOffset = 0x3a;
333  const unsigned CallbackMgrAddrOffset = 0x28;
334 
335  memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode));
336  memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn));
337  memcpy(ResolverMem + CallbackMgrAddrOffset, &CallbackMgr,
338  sizeof(CallbackMgr));
339 }
340 
341 void OrcX86_64_Win32::writeResolverCode(uint8_t *ResolverMem,
342  JITReentryFn ReentryFn,
343  void *CallbackMgr) {
344 
345  // resolverCode is similar to OrcX86_64 with differences specific to windows x64 calling convention:
346  // arguments go into rcx, rdx and come in reverse order, shadow space allocation on stack
347  const uint8_t ResolverCode[] = {
348  // resolver_entry:
349  0x55, // 0x00: pushq %rbp
350  0x48, 0x89, 0xe5, // 0x01: movq %rsp, %rbp
351  0x50, // 0x04: pushq %rax
352  0x53, // 0x05: pushq %rbx
353  0x51, // 0x06: pushq %rcx
354  0x52, // 0x07: pushq %rdx
355  0x56, // 0x08: pushq %rsi
356  0x57, // 0x09: pushq %rdi
357  0x41, 0x50, // 0x0a: pushq %r8
358  0x41, 0x51, // 0x0c: pushq %r9
359  0x41, 0x52, // 0x0e: pushq %r10
360  0x41, 0x53, // 0x10: pushq %r11
361  0x41, 0x54, // 0x12: pushq %r12
362  0x41, 0x55, // 0x14: pushq %r13
363  0x41, 0x56, // 0x16: pushq %r14
364  0x41, 0x57, // 0x18: pushq %r15
365  0x48, 0x81, 0xec, 0x08, 0x02, 0x00, 0x00, // 0x1a: subq 0x208, %rsp
366  0x48, 0x0f, 0xae, 0x04, 0x24, // 0x21: fxsave64 (%rsp)
367 
368  0x48, 0xb9, // 0x26: movabsq <CBMgr>, %rcx
369  // 0x28: Callback manager addr.
370  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
371 
372  0x48, 0x8B, 0x55, 0x08, // 0x30: mov rdx, [rbp+0x8]
373  0x48, 0x83, 0xea, 0x06, // 0x34: sub rdx, 0x6
374 
375  0x48, 0xb8, // 0x38: movabsq <REntry>, %rax
376  // 0x3a: JIT re-entry fn addr:
377  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
378 
379  // 0x42: sub rsp, 0x20 (Allocate shadow space)
380  0x48, 0x83, 0xEC, 0x20,
381  0xff, 0xd0, // 0x46: callq *%rax
382 
383  // 0x48: add rsp, 0x20 (Free shadow space)
384  0x48, 0x83, 0xC4, 0x20,
385 
386  0x48, 0x89, 0x45, 0x08, // 0x4C: movq %rax, 8(%rbp)
387  0x48, 0x0f, 0xae, 0x0c, 0x24, // 0x50: fxrstor64 (%rsp)
388  0x48, 0x81, 0xc4, 0x08, 0x02, 0x00, 0x00, // 0x55: addq 0x208, %rsp
389  0x41, 0x5f, // 0x5C: popq %r15
390  0x41, 0x5e, // 0x5E: popq %r14
391  0x41, 0x5d, // 0x60: popq %r13
392  0x41, 0x5c, // 0x62: popq %r12
393  0x41, 0x5b, // 0x64: popq %r11
394  0x41, 0x5a, // 0x66: popq %r10
395  0x41, 0x59, // 0x68: popq %r9
396  0x41, 0x58, // 0x6a: popq %r8
397  0x5f, // 0x6c: popq %rdi
398  0x5e, // 0x6d: popq %rsi
399  0x5a, // 0x6e: popq %rdx
400  0x59, // 0x6f: popq %rcx
401  0x5b, // 0x70: popq %rbx
402  0x58, // 0x71: popq %rax
403  0x5d, // 0x72: popq %rbp
404  0xc3, // 0x73: retq
405  };
406 
407 
408  const unsigned ReentryFnAddrOffset = 0x3a;
409  const unsigned CallbackMgrAddrOffset = 0x28;
410 
411  memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode));
412  memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn));
413  memcpy(ResolverMem + CallbackMgrAddrOffset, &CallbackMgr,
414  sizeof(CallbackMgr));
415 }
416 
417 void OrcI386::writeResolverCode(uint8_t *ResolverMem, JITReentryFn ReentryFn,
418  void *CallbackMgr) {
419 
420  const uint8_t ResolverCode[] = {
421  // resolver_entry:
422  0x55, // 0x00: pushl %ebp
423  0x89, 0xe5, // 0x01: movl %esp, %ebp
424  0x54, // 0x03: pushl %esp
425  0x83, 0xe4, 0xf0, // 0x04: andl $-0x10, %esp
426  0x50, // 0x07: pushl %eax
427  0x53, // 0x08: pushl %ebx
428  0x51, // 0x09: pushl %ecx
429  0x52, // 0x0a: pushl %edx
430  0x56, // 0x0b: pushl %esi
431  0x57, // 0x0c: pushl %edi
432  0x81, 0xec, 0x18, 0x02, 0x00, 0x00, // 0x0d: subl $0x218, %esp
433  0x0f, 0xae, 0x44, 0x24, 0x10, // 0x13: fxsave 0x10(%esp)
434  0x8b, 0x75, 0x04, // 0x18: movl 0x4(%ebp), %esi
435  0x83, 0xee, 0x05, // 0x1b: subl $0x5, %esi
436  0x89, 0x74, 0x24, 0x04, // 0x1e: movl %esi, 0x4(%esp)
437  0xc7, 0x04, 0x24, 0x00, 0x00, 0x00,
438  0x00, // 0x22: movl <cbmgr>, (%esp)
439  0xb8, 0x00, 0x00, 0x00, 0x00, // 0x29: movl <reentry>, %eax
440  0xff, 0xd0, // 0x2e: calll *%eax
441  0x89, 0x45, 0x04, // 0x30: movl %eax, 0x4(%ebp)
442  0x0f, 0xae, 0x4c, 0x24, 0x10, // 0x33: fxrstor 0x10(%esp)
443  0x81, 0xc4, 0x18, 0x02, 0x00, 0x00, // 0x38: addl $0x218, %esp
444  0x5f, // 0x3e: popl %edi
445  0x5e, // 0x3f: popl %esi
446  0x5a, // 0x40: popl %edx
447  0x59, // 0x41: popl %ecx
448  0x5b, // 0x42: popl %ebx
449  0x58, // 0x43: popl %eax
450  0x8b, 0x65, 0xfc, // 0x44: movl -0x4(%ebp), %esp
451  0x5d, // 0x48: popl %ebp
452  0xc3 // 0x49: retl
453  };
454 
455  const unsigned ReentryFnAddrOffset = 0x2a;
456  const unsigned CallbackMgrAddrOffset = 0x25;
457 
458  memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode));
459  memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn));
460  memcpy(ResolverMem + CallbackMgrAddrOffset, &CallbackMgr,
461  sizeof(CallbackMgr));
462 }
463 
464 void OrcI386::writeTrampolines(uint8_t *TrampolineMem, void *ResolverAddr,
465  unsigned NumTrampolines) {
466 
467  uint64_t CallRelImm = 0xF1C4C400000000e8;
468  uint64_t Resolver = reinterpret_cast<uint64_t>(ResolverAddr);
469  uint64_t ResolverRel =
470  Resolver - reinterpret_cast<uint64_t>(TrampolineMem) - 5;
471 
472  uint64_t *Trampolines = reinterpret_cast<uint64_t *>(TrampolineMem);
473  for (unsigned I = 0; I < NumTrampolines; ++I, ResolverRel -= TrampolineSize)
474  Trampolines[I] = CallRelImm | (ResolverRel << 8);
475 }
476 
478  unsigned MinStubs, void *InitialPtrVal) {
479  // Stub format is:
480  //
481  // .section __orc_stubs
482  // stub1:
483  // jmpq *ptr1
484  // .byte 0xC4 ; <- Invalid opcode padding.
485  // .byte 0xF1
486  // stub2:
487  // jmpq *ptr2
488  //
489  // ...
490  //
491  // .section __orc_ptrs
492  // ptr1:
493  // .quad 0x0
494  // ptr2:
495  // .quad 0x0
496  //
497  // ...
498 
499  const unsigned StubSize = IndirectStubsInfo::StubSize;
500 
501  // Emit at least MinStubs, rounded up to fill the pages allocated.
502  unsigned PageSize = sys::Process::getPageSize();
503  unsigned NumPages = ((MinStubs * StubSize) + (PageSize - 1)) / PageSize;
504  unsigned NumStubs = (NumPages * PageSize) / StubSize;
505 
506  // Allocate memory for stubs and pointers in one call.
507  std::error_code EC;
509  2 * NumPages * PageSize, nullptr,
511 
512  if (EC)
513  return errorCodeToError(EC);
514 
515  // Create separate MemoryBlocks representing the stubs and pointers.
516  sys::MemoryBlock StubsBlock(StubsMem.base(), NumPages * PageSize);
517  sys::MemoryBlock PtrsBlock(static_cast<char *>(StubsMem.base()) +
518  NumPages * PageSize,
519  NumPages * PageSize);
520 
521  // Populate the stubs page stubs and mark it executable.
522  uint64_t *Stub = reinterpret_cast<uint64_t *>(StubsBlock.base());
523  uint64_t PtrAddr = reinterpret_cast<uint64_t>(PtrsBlock.base());
524  for (unsigned I = 0; I < NumStubs; ++I, PtrAddr += 4)
525  Stub[I] = 0xF1C40000000025ff | (PtrAddr << 16);
526 
527  if (auto EC = sys::Memory::protectMappedMemory(
529  return errorCodeToError(EC);
530 
531  // Initialize all pointers to point at FailureAddress.
532  void **Ptr = reinterpret_cast<void **>(PtrsBlock.base());
533  for (unsigned I = 0; I < NumStubs; ++I)
534  Ptr[I] = InitialPtrVal;
535 
536  StubsInfo = IndirectStubsInfo(NumStubs, std::move(StubsMem));
537 
538  return Error::success();
539 }
540 
541 } // End namespace orc.
542 } // End namespace llvm.
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
static void writeResolverCode(uint8_t *ResolveMem, JITReentryFn Reentry, void *CallbackMgr)
Write the resolver code into the given memory.
static const unsigned StubSize
Definition: OrcABISupport.h:78
Provide information about stub blocks generated by the makeIndirectStubsBlock function.
Definition: OrcABISupport.h:76
JITTargetAddress(*)(void *CallbackMgr, void *TrampolineId) JITReentryFn
uint64_t alignTo(uint64_t Value, uint64_t Align, uint64_t Skew=0)
Returns the next integer (mod 2**64) that is greater than or equal to Value and is a multiple of Alig...
Definition: MathExtras.h:677
static void writeResolverCode(uint8_t *ResolveMem, JITReentryFn Reentry, void *CallbackMgr)
Write the resolver code into the given memory.
static MemoryBlock allocateMappedMemory(size_t NumBytes, const MemoryBlock *const NearBlock, unsigned Flags, std::error_code &EC)
This method allocates a block of memory that is suitable for loading dynamically generated code (e...
static Error emitIndirectStubsBlock(IndirectStubsInfo &StubsInfo, unsigned MinStubs, void *InitialPtrVal)
Emit at least MinStubs worth of indirect call stubs, rounded out to the nearest page size...
static void writeResolverCode(uint8_t *ResolveMem, JITReentryFn Reentry, void *CallbackMgr)
Write the resolver code into the given memory.
static cl::opt< int > PageSize("imp-null-check-page-size", cl::desc("The page size of the target in bytes"), cl::init(4096))
static Error emitIndirectStubsBlock(IndirectStubsInfo &StubsInfo, unsigned MinStubs, void *InitialPtrVal)
Emit at least MinStubs worth of indirect call stubs, rounded out to the nearest page size...
Error errorCodeToError(std::error_code EC)
Helper for converting an std::error_code to a Error.
Definition: Error.cpp:78
static const unsigned TrampolineSize
JITTargetAddress(*)(void *CallbackMgr, void *TrampolineId) JITReentryFn
JITTargetAddress(*)(void *CallbackMgr, void *TrampolineId) JITReentryFn
static unsigned getPageSize()
GenericIndirectStubsInfo< 8 > IndirectStubsInfo
static ErrorSuccess success()
Create a success value.
Definition: Error.h:313
static void writeTrampolines(uint8_t *TrampolineMem, void *ResolverAddr, unsigned NumTrampolines)
Write the requsted number of trampolines into the given memory, which must be big enough to hold 1 po...
This class encapsulates the notion of a memory block which has an address and a size.
Definition: Memory.h:29
JITTargetAddress(*)(void *CallbackMgr, void *TrampolineId) JITReentryFn
Owning version of MemoryBlock.
Definition: Memory.h:119
static void writeResolverCode(uint8_t *ResolveMem, JITReentryFn Reentry, void *CallbackMgr)
Write the resolver code into the given memory.
static void writeTrampolines(uint8_t *TrampolineMem, void *ResolverAddr, unsigned NumTrampolines)
Write the requsted number of trampolines into the given memory, which must be big enough to hold 1 po...
Provides a library for accessing information about this process and other processes on the operating ...
static void writeTrampolines(uint8_t *TrampolineMem, void *ResolverAddr, unsigned NumTrampolines)
Write the requsted number of trampolines into the given memory, which must be big enough to hold 1 po...
#define I(x, y, z)
Definition: MD5.cpp:58
Lightweight error class with error context and mandatory checking.
Definition: Error.h:156
static Error emitIndirectStubsBlock(IndirectStubsInfo &StubsInfo, unsigned MinStubs, void *InitialPtrVal)
Emit at least MinStubs worth of indirect call stubs, rounded out to the nearest page size...
static std::error_code protectMappedMemory(const MemoryBlock &Block, unsigned Flags)
This method sets the protection flags for a block of memory to the state specified by /p Flags...