LLVM  7.0.0svn
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/Support/Process.h"
12 
13 namespace llvm {
14 namespace orc {
15 
16 void OrcAArch64::writeResolverCode(uint8_t *ResolverMem, JITReentryFn ReentryFn,
17  void *CallbackMgr) {
18 
19  const uint32_t ResolverCode[] = {
20  // resolver_entry:
21  0xa9bf47fd, // 0x000: stp x29, x17, [sp, #-16]!
22  0x910003fd, // 0x004: mov x29, sp
23  0xa9bf73fb, // 0x008: stp x27, x28, [sp, #-16]!
24  0xa9bf6bf9, // 0x00c: stp x25, x26, [sp, #-16]!
25  0xa9bf63f7, // 0x010: stp x23, x24, [sp, #-16]!
26  0xa9bf5bf5, // 0x014: stp x21, x22, [sp, #-16]!
27  0xa9bf53f3, // 0x018: stp x19, x20, [sp, #-16]!
28  0xa9bf3fee, // 0x01c: stp x14, x15, [sp, #-16]!
29  0xa9bf37ec, // 0x020: stp x12, x13, [sp, #-16]!
30  0xa9bf2fea, // 0x024: stp x10, x11, [sp, #-16]!
31  0xa9bf27e8, // 0x028: stp x8, x9, [sp, #-16]!
32  0xa9bf1fe6, // 0x02c: stp x6, x7, [sp, #-16]!
33  0xa9bf17e4, // 0x030: stp x4, x5, [sp, #-16]!
34  0xa9bf0fe2, // 0x034: stp x2, x3, [sp, #-16]!
35  0xa9bf07e0, // 0x038: stp x0, x1, [sp, #-16]!
36  0xadbf7ffe, // 0x03c: stp q30, q31, [sp, #-32]!
37  0xadbf77fc, // 0x040: stp q28, q29, [sp, #-32]!
38  0xadbf6ffa, // 0x044: stp q26, q27, [sp, #-32]!
39  0xadbf67f8, // 0x048: stp q24, q25, [sp, #-32]!
40  0xadbf5ff6, // 0x04c: stp q22, q23, [sp, #-32]!
41  0xadbf57f4, // 0x050: stp q20, q21, [sp, #-32]!
42  0xadbf4ff2, // 0x054: stp q18, q19, [sp, #-32]!
43  0xadbf47f0, // 0x058: stp q16, q17, [sp, #-32]!
44  0xadbf3fee, // 0x05c: stp q14, q15, [sp, #-32]!
45  0xadbf37ec, // 0x060: stp q12, q13, [sp, #-32]!
46  0xadbf2fea, // 0x064: stp q10, q11, [sp, #-32]!
47  0xadbf27e8, // 0x068: stp q8, q9, [sp, #-32]!
48  0xadbf1fe6, // 0x06c: stp q6, q7, [sp, #-32]!
49  0xadbf17e4, // 0x070: stp q4, q5, [sp, #-32]!
50  0xadbf0fe2, // 0x074: stp q2, q3, [sp, #-32]!
51  0xadbf07e0, // 0x078: stp q0, q1, [sp, #-32]!
52  0x580004e0, // 0x07c: ldr x0, Lcallbackmgr
53  0xaa1e03e1, // 0x080: mov x1, x30
54  0xd1003021, // 0x084: sub x1, x1, #12
55  0x58000442, // 0x088: ldr x2, Lreentry_fn_ptr
56  0xd63f0040, // 0x08c: blr x2
57  0xaa0003f1, // 0x090: mov x17, x0
58  0xacc107e0, // 0x094: ldp q0, q1, [sp], #32
59  0xacc10fe2, // 0x098: ldp q2, q3, [sp], #32
60  0xacc117e4, // 0x09c: ldp q4, q5, [sp], #32
61  0xacc11fe6, // 0x0a0: ldp q6, q7, [sp], #32
62  0xacc127e8, // 0x0a4: ldp q8, q9, [sp], #32
63  0xacc12fea, // 0x0a8: ldp q10, q11, [sp], #32
64  0xacc137ec, // 0x0ac: ldp q12, q13, [sp], #32
65  0xacc13fee, // 0x0b0: ldp q14, q15, [sp], #32
66  0xacc147f0, // 0x0b4: ldp q16, q17, [sp], #32
67  0xacc14ff2, // 0x0b8: ldp q18, q19, [sp], #32
68  0xacc157f4, // 0x0bc: ldp q20, q21, [sp], #32
69  0xacc15ff6, // 0x0c0: ldp q22, q23, [sp], #32
70  0xacc167f8, // 0x0c4: ldp q24, q25, [sp], #32
71  0xacc16ffa, // 0x0c8: ldp q26, q27, [sp], #32
72  0xacc177fc, // 0x0cc: ldp q28, q29, [sp], #32
73  0xacc17ffe, // 0x0d0: ldp q30, q31, [sp], #32
74  0xa8c107e0, // 0x0d4: ldp x0, x1, [sp], #16
75  0xa8c10fe2, // 0x0d8: ldp x2, x3, [sp], #16
76  0xa8c117e4, // 0x0dc: ldp x4, x5, [sp], #16
77  0xa8c11fe6, // 0x0e0: ldp x6, x7, [sp], #16
78  0xa8c127e8, // 0x0e4: ldp x8, x9, [sp], #16
79  0xa8c12fea, // 0x0e8: ldp x10, x11, [sp], #16
80  0xa8c137ec, // 0x0ec: ldp x12, x13, [sp], #16
81  0xa8c13fee, // 0x0f0: ldp x14, x15, [sp], #16
82  0xa8c153f3, // 0x0f4: ldp x19, x20, [sp], #16
83  0xa8c15bf5, // 0x0f8: ldp x21, x22, [sp], #16
84  0xa8c163f7, // 0x0fc: ldp x23, x24, [sp], #16
85  0xa8c16bf9, // 0x100: ldp x25, x26, [sp], #16
86  0xa8c173fb, // 0x104: ldp x27, x28, [sp], #16
87  0xa8c17bfd, // 0x108: ldp x29, x30, [sp], #16
88  0xd65f0220, // 0x10c: ret x17
89  0x01234567, // 0x110: Lreentry_fn_ptr:
90  0xdeadbeef, // 0x114: .quad 0
91  0x98765432, // 0x118: Lcallbackmgr:
92  0xcafef00d // 0x11c: .quad 0
93  };
94 
95  const unsigned ReentryFnAddrOffset = 0x110;
96  const unsigned CallbackMgrAddrOffset = 0x118;
97 
98  memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode));
99  memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn));
100  memcpy(ResolverMem + CallbackMgrAddrOffset, &CallbackMgr,
101  sizeof(CallbackMgr));
102 }
103 
104 void OrcAArch64::writeTrampolines(uint8_t *TrampolineMem, void *ResolverAddr,
105  unsigned NumTrampolines) {
106 
107  unsigned OffsetToPtr = alignTo(NumTrampolines * TrampolineSize, 8);
108 
109  memcpy(TrampolineMem + OffsetToPtr, &ResolverAddr, sizeof(void *));
110 
111  // OffsetToPtr is actually the offset from the PC for the 2nd instruction, so
112  // subtract 32-bits.
113  OffsetToPtr -= 4;
114 
115  uint32_t *Trampolines = reinterpret_cast<uint32_t *>(TrampolineMem);
116 
117  for (unsigned I = 0; I < NumTrampolines; ++I, OffsetToPtr -= TrampolineSize) {
118  Trampolines[3 * I + 0] = 0xaa1e03f1; // mov x17, x30
119  Trampolines[3 * I + 1] = 0x58000010 | (OffsetToPtr << 3); // adr x16, Lptr
120  Trampolines[3 * I + 2] = 0xd63f0200; // blr x16
121  }
122 
123 }
124 
126  unsigned MinStubs,
127  void *InitialPtrVal) {
128  // Stub format is:
129  //
130  // .section __orc_stubs
131  // stub1:
132  // ldr x0, ptr1 ; PC-rel load of ptr1
133  // br x0 ; Jump to resolver
134  // stub2:
135  // ldr x0, ptr2 ; PC-rel load of ptr2
136  // br x0 ; Jump to resolver
137  //
138  // ...
139  //
140  // .section __orc_ptrs
141  // ptr1:
142  // .quad 0x0
143  // ptr2:
144  // .quad 0x0
145  //
146  // ...
147 
148  const unsigned StubSize = IndirectStubsInfo::StubSize;
149 
150  // Emit at least MinStubs, rounded up to fill the pages allocated.
151  unsigned PageSize = sys::Process::getPageSize();
152  unsigned NumPages = ((MinStubs * StubSize) + (PageSize - 1)) / PageSize;
153  unsigned NumStubs = (NumPages * PageSize) / StubSize;
154 
155  // Allocate memory for stubs and pointers in one call.
156  std::error_code EC;
158  2 * NumPages * PageSize, nullptr,
160 
161  if (EC)
162  return errorCodeToError(EC);
163 
164  // Create separate MemoryBlocks representing the stubs and pointers.
165  sys::MemoryBlock StubsBlock(StubsMem.base(), NumPages * PageSize);
166  sys::MemoryBlock PtrsBlock(static_cast<char *>(StubsMem.base()) +
167  NumPages * PageSize,
168  NumPages * PageSize);
169 
170  // Populate the stubs page stubs and mark it executable.
171  uint64_t *Stub = reinterpret_cast<uint64_t *>(StubsBlock.base());
172  uint64_t PtrOffsetField = static_cast<uint64_t>(NumPages * PageSize)
173  << 3;
174 
175  for (unsigned I = 0; I < NumStubs; ++I)
176  Stub[I] = 0xd61f020058000010 | PtrOffsetField;
177 
178  if (auto EC = sys::Memory::protectMappedMemory(
180  return errorCodeToError(EC);
181 
182  // Initialize all pointers to point at FailureAddress.
183  void **Ptr = reinterpret_cast<void **>(PtrsBlock.base());
184  for (unsigned I = 0; I < NumStubs; ++I)
185  Ptr[I] = InitialPtrVal;
186 
187  StubsInfo = IndirectStubsInfo(NumStubs, std::move(StubsMem));
188 
189  return Error::success();
190 }
191 
192 void OrcX86_64_Base::writeTrampolines(uint8_t *TrampolineMem,
193  void *ResolverAddr,
194  unsigned NumTrampolines) {
195 
196  unsigned OffsetToPtr = NumTrampolines * TrampolineSize;
197 
198  memcpy(TrampolineMem + OffsetToPtr, &ResolverAddr, sizeof(void *));
199 
200  uint64_t *Trampolines = reinterpret_cast<uint64_t *>(TrampolineMem);
201  uint64_t CallIndirPCRel = 0xf1c40000000015ff;
202 
203  for (unsigned I = 0; I < NumTrampolines; ++I, OffsetToPtr -= TrampolineSize)
204  Trampolines[I] = CallIndirPCRel | ((OffsetToPtr - 6) << 16);
205 }
206 
208  unsigned MinStubs,
209  void *InitialPtrVal) {
210  // Stub format is:
211  //
212  // .section __orc_stubs
213  // stub1:
214  // jmpq *ptr1(%rip)
215  // .byte 0xC4 ; <- Invalid opcode padding.
216  // .byte 0xF1
217  // stub2:
218  // jmpq *ptr2(%rip)
219  //
220  // ...
221  //
222  // .section __orc_ptrs
223  // ptr1:
224  // .quad 0x0
225  // ptr2:
226  // .quad 0x0
227  //
228  // ...
229 
230  const unsigned StubSize = IndirectStubsInfo::StubSize;
231 
232  // Emit at least MinStubs, rounded up to fill the pages allocated.
233  unsigned PageSize = sys::Process::getPageSize();
234  unsigned NumPages = ((MinStubs * StubSize) + (PageSize - 1)) / PageSize;
235  unsigned NumStubs = (NumPages * PageSize) / StubSize;
236 
237  // Allocate memory for stubs and pointers in one call.
238  std::error_code EC;
240  2 * NumPages * PageSize, nullptr,
242 
243  if (EC)
244  return errorCodeToError(EC);
245 
246  // Create separate MemoryBlocks representing the stubs and pointers.
247  sys::MemoryBlock StubsBlock(StubsMem.base(), NumPages * PageSize);
248  sys::MemoryBlock PtrsBlock(static_cast<char *>(StubsMem.base()) +
249  NumPages * PageSize,
250  NumPages * PageSize);
251 
252  // Populate the stubs page stubs and mark it executable.
253  uint64_t *Stub = reinterpret_cast<uint64_t *>(StubsBlock.base());
254  uint64_t PtrOffsetField = static_cast<uint64_t>(NumPages * PageSize - 6)
255  << 16;
256  for (unsigned I = 0; I < NumStubs; ++I)
257  Stub[I] = 0xF1C40000000025ff | PtrOffsetField;
258 
259  if (auto EC = sys::Memory::protectMappedMemory(
261  return errorCodeToError(EC);
262 
263  // Initialize all pointers to point at FailureAddress.
264  void **Ptr = reinterpret_cast<void **>(PtrsBlock.base());
265  for (unsigned I = 0; I < NumStubs; ++I)
266  Ptr[I] = InitialPtrVal;
267 
268  StubsInfo = IndirectStubsInfo(NumStubs, std::move(StubsMem));
269 
270  return Error::success();
271 }
272 
273 void OrcX86_64_SysV::writeResolverCode(uint8_t *ResolverMem,
274  JITReentryFn ReentryFn,
275  void *CallbackMgr) {
276 
277  const uint8_t ResolverCode[] = {
278  // resolver_entry:
279  0x55, // 0x00: pushq %rbp
280  0x48, 0x89, 0xe5, // 0x01: movq %rsp, %rbp
281  0x50, // 0x04: pushq %rax
282  0x53, // 0x05: pushq %rbx
283  0x51, // 0x06: pushq %rcx
284  0x52, // 0x07: pushq %rdx
285  0x56, // 0x08: pushq %rsi
286  0x57, // 0x09: pushq %rdi
287  0x41, 0x50, // 0x0a: pushq %r8
288  0x41, 0x51, // 0x0c: pushq %r9
289  0x41, 0x52, // 0x0e: pushq %r10
290  0x41, 0x53, // 0x10: pushq %r11
291  0x41, 0x54, // 0x12: pushq %r12
292  0x41, 0x55, // 0x14: pushq %r13
293  0x41, 0x56, // 0x16: pushq %r14
294  0x41, 0x57, // 0x18: pushq %r15
295  0x48, 0x81, 0xec, 0x08, 0x02, 0x00, 0x00, // 0x1a: subq 0x208, %rsp
296  0x48, 0x0f, 0xae, 0x04, 0x24, // 0x21: fxsave64 (%rsp)
297  0x48, 0xbf, // 0x26: movabsq <CBMgr>, %rdi
298 
299  // 0x28: Callback manager addr.
300  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
301 
302  0x48, 0x8b, 0x75, 0x08, // 0x30: movq 8(%rbp), %rsi
303  0x48, 0x83, 0xee, 0x06, // 0x34: subq $6, %rsi
304  0x48, 0xb8, // 0x38: movabsq <REntry>, %rax
305 
306  // 0x3a: JIT re-entry fn addr:
307  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
308 
309  0xff, 0xd0, // 0x42: callq *%rax
310  0x48, 0x89, 0x45, 0x08, // 0x44: movq %rax, 8(%rbp)
311  0x48, 0x0f, 0xae, 0x0c, 0x24, // 0x48: fxrstor64 (%rsp)
312  0x48, 0x81, 0xc4, 0x08, 0x02, 0x00, 0x00, // 0x4d: addq 0x208, %rsp
313  0x41, 0x5f, // 0x54: popq %r15
314  0x41, 0x5e, // 0x56: popq %r14
315  0x41, 0x5d, // 0x58: popq %r13
316  0x41, 0x5c, // 0x5a: popq %r12
317  0x41, 0x5b, // 0x5c: popq %r11
318  0x41, 0x5a, // 0x5e: popq %r10
319  0x41, 0x59, // 0x60: popq %r9
320  0x41, 0x58, // 0x62: popq %r8
321  0x5f, // 0x64: popq %rdi
322  0x5e, // 0x65: popq %rsi
323  0x5a, // 0x66: popq %rdx
324  0x59, // 0x67: popq %rcx
325  0x5b, // 0x68: popq %rbx
326  0x58, // 0x69: popq %rax
327  0x5d, // 0x6a: popq %rbp
328  0xc3, // 0x6b: retq
329  };
330 
331  const unsigned ReentryFnAddrOffset = 0x3a;
332  const unsigned CallbackMgrAddrOffset = 0x28;
333 
334  memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode));
335  memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn));
336  memcpy(ResolverMem + CallbackMgrAddrOffset, &CallbackMgr,
337  sizeof(CallbackMgr));
338 }
339 
340 void OrcX86_64_Win32::writeResolverCode(uint8_t *ResolverMem,
341  JITReentryFn ReentryFn,
342  void *CallbackMgr) {
343 
344  // resolverCode is similar to OrcX86_64 with differences specific to windows x64 calling convention:
345  // arguments go into rcx, rdx and come in reverse order, shadow space allocation on stack
346  const uint8_t ResolverCode[] = {
347  // resolver_entry:
348  0x55, // 0x00: pushq %rbp
349  0x48, 0x89, 0xe5, // 0x01: movq %rsp, %rbp
350  0x50, // 0x04: pushq %rax
351  0x53, // 0x05: pushq %rbx
352  0x51, // 0x06: pushq %rcx
353  0x52, // 0x07: pushq %rdx
354  0x56, // 0x08: pushq %rsi
355  0x57, // 0x09: pushq %rdi
356  0x41, 0x50, // 0x0a: pushq %r8
357  0x41, 0x51, // 0x0c: pushq %r9
358  0x41, 0x52, // 0x0e: pushq %r10
359  0x41, 0x53, // 0x10: pushq %r11
360  0x41, 0x54, // 0x12: pushq %r12
361  0x41, 0x55, // 0x14: pushq %r13
362  0x41, 0x56, // 0x16: pushq %r14
363  0x41, 0x57, // 0x18: pushq %r15
364  0x48, 0x81, 0xec, 0x08, 0x02, 0x00, 0x00, // 0x1a: subq 0x208, %rsp
365  0x48, 0x0f, 0xae, 0x04, 0x24, // 0x21: fxsave64 (%rsp)
366 
367  0x48, 0xb9, // 0x26: movabsq <CBMgr>, %rcx
368  // 0x28: Callback manager addr.
369  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
370 
371  0x48, 0x8B, 0x55, 0x08, // 0x30: mov rdx, [rbp+0x8]
372  0x48, 0x83, 0xea, 0x06, // 0x34: sub rdx, 0x6
373 
374  0x48, 0xb8, // 0x38: movabsq <REntry>, %rax
375  // 0x3a: JIT re-entry fn addr:
376  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
377 
378  // 0x42: sub rsp, 0x20 (Allocate shadow space)
379  0x48, 0x83, 0xEC, 0x20,
380  0xff, 0xd0, // 0x46: callq *%rax
381 
382  // 0x48: add rsp, 0x20 (Free shadow space)
383  0x48, 0x83, 0xC4, 0x20,
384 
385  0x48, 0x89, 0x45, 0x08, // 0x4C: movq %rax, 8(%rbp)
386  0x48, 0x0f, 0xae, 0x0c, 0x24, // 0x50: fxrstor64 (%rsp)
387  0x48, 0x81, 0xc4, 0x08, 0x02, 0x00, 0x00, // 0x55: addq 0x208, %rsp
388  0x41, 0x5f, // 0x5C: popq %r15
389  0x41, 0x5e, // 0x5E: popq %r14
390  0x41, 0x5d, // 0x60: popq %r13
391  0x41, 0x5c, // 0x62: popq %r12
392  0x41, 0x5b, // 0x64: popq %r11
393  0x41, 0x5a, // 0x66: popq %r10
394  0x41, 0x59, // 0x68: popq %r9
395  0x41, 0x58, // 0x6a: popq %r8
396  0x5f, // 0x6c: popq %rdi
397  0x5e, // 0x6d: popq %rsi
398  0x5a, // 0x6e: popq %rdx
399  0x59, // 0x6f: popq %rcx
400  0x5b, // 0x70: popq %rbx
401  0x58, // 0x71: popq %rax
402  0x5d, // 0x72: popq %rbp
403  0xc3, // 0x73: retq
404  };
405 
406 
407  const unsigned ReentryFnAddrOffset = 0x3a;
408  const unsigned CallbackMgrAddrOffset = 0x28;
409 
410  memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode));
411  memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn));
412  memcpy(ResolverMem + CallbackMgrAddrOffset, &CallbackMgr,
413  sizeof(CallbackMgr));
414 }
415 
416 void OrcI386::writeResolverCode(uint8_t *ResolverMem, JITReentryFn ReentryFn,
417  void *CallbackMgr) {
418 
419  const uint8_t ResolverCode[] = {
420  // resolver_entry:
421  0x55, // 0x00: pushl %ebp
422  0x89, 0xe5, // 0x01: movl %esp, %ebp
423  0x54, // 0x03: pushl %esp
424  0x83, 0xe4, 0xf0, // 0x04: andl $-0x10, %esp
425  0x50, // 0x07: pushl %eax
426  0x53, // 0x08: pushl %ebx
427  0x51, // 0x09: pushl %ecx
428  0x52, // 0x0a: pushl %edx
429  0x56, // 0x0b: pushl %esi
430  0x57, // 0x0c: pushl %edi
431  0x81, 0xec, 0x18, 0x02, 0x00, 0x00, // 0x0d: subl $0x218, %esp
432  0x0f, 0xae, 0x44, 0x24, 0x10, // 0x13: fxsave 0x10(%esp)
433  0x8b, 0x75, 0x04, // 0x18: movl 0x4(%ebp), %esi
434  0x83, 0xee, 0x05, // 0x1b: subl $0x5, %esi
435  0x89, 0x74, 0x24, 0x04, // 0x1e: movl %esi, 0x4(%esp)
436  0xc7, 0x04, 0x24, 0x00, 0x00, 0x00,
437  0x00, // 0x22: movl <cbmgr>, (%esp)
438  0xb8, 0x00, 0x00, 0x00, 0x00, // 0x29: movl <reentry>, %eax
439  0xff, 0xd0, // 0x2e: calll *%eax
440  0x89, 0x45, 0x04, // 0x30: movl %eax, 0x4(%ebp)
441  0x0f, 0xae, 0x4c, 0x24, 0x10, // 0x33: fxrstor 0x10(%esp)
442  0x81, 0xc4, 0x18, 0x02, 0x00, 0x00, // 0x38: addl $0x218, %esp
443  0x5f, // 0x3e: popl %edi
444  0x5e, // 0x3f: popl %esi
445  0x5a, // 0x40: popl %edx
446  0x59, // 0x41: popl %ecx
447  0x5b, // 0x42: popl %ebx
448  0x58, // 0x43: popl %eax
449  0x8b, 0x65, 0xfc, // 0x44: movl -0x4(%ebp), %esp
450  0x5d, // 0x48: popl %ebp
451  0xc3 // 0x49: retl
452  };
453 
454  const unsigned ReentryFnAddrOffset = 0x2a;
455  const unsigned CallbackMgrAddrOffset = 0x25;
456 
457  memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode));
458  memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn));
459  memcpy(ResolverMem + CallbackMgrAddrOffset, &CallbackMgr,
460  sizeof(CallbackMgr));
461 }
462 
463 void OrcI386::writeTrampolines(uint8_t *TrampolineMem, void *ResolverAddr,
464  unsigned NumTrampolines) {
465 
466  uint64_t CallRelImm = 0xF1C4C400000000e8;
467  uint64_t Resolver = reinterpret_cast<uint64_t>(ResolverAddr);
468  uint64_t ResolverRel =
469  Resolver - reinterpret_cast<uint64_t>(TrampolineMem) - 5;
470 
471  uint64_t *Trampolines = reinterpret_cast<uint64_t *>(TrampolineMem);
472  for (unsigned I = 0; I < NumTrampolines; ++I, ResolverRel -= TrampolineSize)
473  Trampolines[I] = CallRelImm | (ResolverRel << 8);
474 }
475 
477  unsigned MinStubs, void *InitialPtrVal) {
478  // Stub format is:
479  //
480  // .section __orc_stubs
481  // stub1:
482  // jmpq *ptr1
483  // .byte 0xC4 ; <- Invalid opcode padding.
484  // .byte 0xF1
485  // stub2:
486  // jmpq *ptr2
487  //
488  // ...
489  //
490  // .section __orc_ptrs
491  // ptr1:
492  // .quad 0x0
493  // ptr2:
494  // .quad 0x0
495  //
496  // ...
497 
498  const unsigned StubSize = IndirectStubsInfo::StubSize;
499 
500  // Emit at least MinStubs, rounded up to fill the pages allocated.
501  unsigned PageSize = sys::Process::getPageSize();
502  unsigned NumPages = ((MinStubs * StubSize) + (PageSize - 1)) / PageSize;
503  unsigned NumStubs = (NumPages * PageSize) / StubSize;
504 
505  // Allocate memory for stubs and pointers in one call.
506  std::error_code EC;
508  2 * NumPages * PageSize, nullptr,
510 
511  if (EC)
512  return errorCodeToError(EC);
513 
514  // Create separate MemoryBlocks representing the stubs and pointers.
515  sys::MemoryBlock StubsBlock(StubsMem.base(), NumPages * PageSize);
516  sys::MemoryBlock PtrsBlock(static_cast<char *>(StubsMem.base()) +
517  NumPages * PageSize,
518  NumPages * PageSize);
519 
520  // Populate the stubs page stubs and mark it executable.
521  uint64_t *Stub = reinterpret_cast<uint64_t *>(StubsBlock.base());
522  uint64_t PtrAddr = reinterpret_cast<uint64_t>(PtrsBlock.base());
523  for (unsigned I = 0; I < NumStubs; ++I, PtrAddr += 4)
524  Stub[I] = 0xF1C40000000025ff | (PtrAddr << 16);
525 
526  if (auto EC = sys::Memory::protectMappedMemory(
528  return errorCodeToError(EC);
529 
530  // Initialize all pointers to point at FailureAddress.
531  void **Ptr = reinterpret_cast<void **>(PtrsBlock.base());
532  for (unsigned I = 0; I < NumStubs; ++I)
533  Ptr[I] = InitialPtrVal;
534 
535  StubsInfo = IndirectStubsInfo(NumStubs, std::move(StubsMem));
536 
537  return Error::success();
538 }
539 
540 } // End namespace orc.
541 } // 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:685
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 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
Interface for looking up the initializer for a variable name, used by Init::resolveReferences.
Definition: Record.h:1774
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:321
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
static cl::opt< int > PageSize("imp-null-check-page-size", cl::desc("The page size of the target in bytes"), cl::init(4096), cl::Hidden)
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...