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
10 #include "llvm/ExecutionEngine/Orc/OrcABISupport.h"
11 #include "llvm/Support/Process.h"
12
13 namespace llvm {
14 namespace orc {
15
writeResolverCode(uint8_t * ResolverMem,JITReentryFn ReentryFn,void * CallbackMgr)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
writeTrampolines(uint8_t * TrampolineMem,void * ResolverAddr,unsigned NumTrampolines)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
emitIndirectStubsBlock(IndirectStubsInfo & StubsInfo,unsigned MinStubs,void * InitialPtrVal)125 Error OrcAArch64::emitIndirectStubsBlock(IndirectStubsInfo &StubsInfo,
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;
157 auto StubsMem = sys::OwningMemoryBlock(sys::Memory::allocateMappedMemory(
158 2 * NumPages * PageSize, nullptr,
159 sys::Memory::MF_READ | sys::Memory::MF_WRITE, EC));
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(
179 StubsBlock, sys::Memory::MF_READ | sys::Memory::MF_EXEC))
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
writeTrampolines(uint8_t * TrampolineMem,void * ResolverAddr,unsigned NumTrampolines)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
emitIndirectStubsBlock(IndirectStubsInfo & StubsInfo,unsigned MinStubs,void * InitialPtrVal)207 Error OrcX86_64_Base::emitIndirectStubsBlock(IndirectStubsInfo &StubsInfo,
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;
239 auto StubsMem = sys::OwningMemoryBlock(sys::Memory::allocateMappedMemory(
240 2 * NumPages * PageSize, nullptr,
241 sys::Memory::MF_READ | sys::Memory::MF_WRITE, EC));
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(
260 StubsBlock, sys::Memory::MF_READ | sys::Memory::MF_EXEC))
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
writeResolverCode(uint8_t * ResolverMem,JITReentryFn ReentryFn,void * CallbackMgr)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
writeResolverCode(uint8_t * ResolverMem,JITReentryFn ReentryFn,void * CallbackMgr)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
writeResolverCode(uint8_t * ResolverMem,JITReentryFn ReentryFn,void * CallbackMgr)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
writeTrampolines(uint8_t * TrampolineMem,void * ResolverAddr,unsigned NumTrampolines)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
emitIndirectStubsBlock(IndirectStubsInfo & StubsInfo,unsigned MinStubs,void * InitialPtrVal)476 Error OrcI386::emitIndirectStubsBlock(IndirectStubsInfo &StubsInfo,
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;
507 auto StubsMem = sys::OwningMemoryBlock(sys::Memory::allocateMappedMemory(
508 2 * NumPages * PageSize, nullptr,
509 sys::Memory::MF_READ | sys::Memory::MF_WRITE, EC));
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(
527 StubsBlock, sys::Memory::MF_READ | sys::Memory::MF_EXEC))
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.
542