[Orc] Rename OrcArchitectureSupport to OrcABISupport and add Win32 ABI support.
This enables lazy JITing on Windows x86-64.
Patch by David. Thanks David!
llvm-svn: 268845
diff --git a/llvm/lib/ExecutionEngine/Orc/OrcABISupport.cpp b/llvm/lib/ExecutionEngine/Orc/OrcABISupport.cpp
new file mode 100644
index 0000000..9869b6c
--- /dev/null
+++ b/llvm/lib/ExecutionEngine/Orc/OrcABISupport.cpp
@@ -0,0 +1,542 @@
+//===------------- OrcABISupport.cpp - ABI specific support code ----------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ExecutionEngine/Orc/OrcABISupport.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/Support/Process.h"
+
+namespace llvm {
+namespace orc {
+
+void OrcAArch64::writeResolverCode(uint8_t *ResolverMem, JITReentryFn ReentryFn,
+ void *CallbackMgr) {
+
+ const uint32_t ResolverCode[] = {
+ // resolver_entry:
+ 0xa9bf47fd, // 0x000: stp x29, x17, [sp, #-16]!
+ 0x910003fd, // 0x004: mov x29, sp
+ 0xa9bf73fb, // 0x008: stp x27, x28, [sp, #-16]!
+ 0xa9bf6bf9, // 0x00c: stp x25, x26, [sp, #-16]!
+ 0xa9bf63f7, // 0x010: stp x23, x24, [sp, #-16]!
+ 0xa9bf5bf5, // 0x014: stp x21, x22, [sp, #-16]!
+ 0xa9bf53f3, // 0x018: stp x19, x20, [sp, #-16]!
+ 0xa9bf3fee, // 0x01c: stp x14, x15, [sp, #-16]!
+ 0xa9bf37ec, // 0x020: stp x12, x13, [sp, #-16]!
+ 0xa9bf2fea, // 0x024: stp x10, x11, [sp, #-16]!
+ 0xa9bf27e8, // 0x028: stp x8, x9, [sp, #-16]!
+ 0xa9bf1fe6, // 0x02c: stp x6, x7, [sp, #-16]!
+ 0xa9bf17e4, // 0x030: stp x4, x5, [sp, #-16]!
+ 0xa9bf0fe2, // 0x034: stp x2, x3, [sp, #-16]!
+ 0xa9bf07e0, // 0x038: stp x0, x1, [sp, #-16]!
+ 0xadbf7ffe, // 0x03c: stp q30, q31, [sp, #-32]!
+ 0xadbf77fc, // 0x040: stp q28, q29, [sp, #-32]!
+ 0xadbf6ffa, // 0x044: stp q26, q27, [sp, #-32]!
+ 0xadbf67f8, // 0x048: stp q24, q25, [sp, #-32]!
+ 0xadbf5ff6, // 0x04c: stp q22, q23, [sp, #-32]!
+ 0xadbf57f4, // 0x050: stp q20, q21, [sp, #-32]!
+ 0xadbf4ff2, // 0x054: stp q18, q19, [sp, #-32]!
+ 0xadbf47f0, // 0x058: stp q16, q17, [sp, #-32]!
+ 0xadbf3fee, // 0x05c: stp q14, q15, [sp, #-32]!
+ 0xadbf37ec, // 0x060: stp q12, q13, [sp, #-32]!
+ 0xadbf2fea, // 0x064: stp q10, q11, [sp, #-32]!
+ 0xadbf27e8, // 0x068: stp q8, q9, [sp, #-32]!
+ 0xadbf1fe6, // 0x06c: stp q6, q7, [sp, #-32]!
+ 0xadbf17e4, // 0x070: stp q4, q5, [sp, #-32]!
+ 0xadbf0fe2, // 0x074: stp q2, q3, [sp, #-32]!
+ 0xadbf07e0, // 0x078: stp q0, q1, [sp, #-32]!
+ 0x580004e0, // 0x07c: ldr x0, Lcallbackmgr
+ 0xaa1e03e1, // 0x080: mov x1, x30
+ 0xd1003021, // 0x084: sub x1, x1, #12
+ 0x58000442, // 0x088: ldr x2, Lreentry_fn_ptr
+ 0xd63f0040, // 0x08c: blr x2
+ 0xaa0003f1, // 0x090: mov x17, x0
+ 0xacc107e0, // 0x094: ldp q0, q1, [sp], #32
+ 0xacc10fe2, // 0x098: ldp q2, q3, [sp], #32
+ 0xacc117e4, // 0x09c: ldp q4, q5, [sp], #32
+ 0xacc11fe6, // 0x0a0: ldp q6, q7, [sp], #32
+ 0xacc127e8, // 0x0a4: ldp q8, q9, [sp], #32
+ 0xacc12fea, // 0x0a8: ldp q10, q11, [sp], #32
+ 0xacc137ec, // 0x0ac: ldp q12, q13, [sp], #32
+ 0xacc13fee, // 0x0b0: ldp q14, q15, [sp], #32
+ 0xacc147f0, // 0x0b4: ldp q16, q17, [sp], #32
+ 0xacc14ff2, // 0x0b8: ldp q18, q19, [sp], #32
+ 0xacc157f4, // 0x0bc: ldp q20, q21, [sp], #32
+ 0xacc15ff6, // 0x0c0: ldp q22, q23, [sp], #32
+ 0xacc167f8, // 0x0c4: ldp q24, q25, [sp], #32
+ 0xacc16ffa, // 0x0c8: ldp q26, q27, [sp], #32
+ 0xacc177fc, // 0x0cc: ldp q28, q29, [sp], #32
+ 0xacc17ffe, // 0x0d0: ldp q30, q31, [sp], #32
+ 0xa8c107e0, // 0x0d4: ldp x0, x1, [sp], #16
+ 0xa8c10fe2, // 0x0d8: ldp x2, x3, [sp], #16
+ 0xa8c117e4, // 0x0dc: ldp x4, x5, [sp], #16
+ 0xa8c11fe6, // 0x0e0: ldp x6, x7, [sp], #16
+ 0xa8c127e8, // 0x0e4: ldp x8, x9, [sp], #16
+ 0xa8c12fea, // 0x0e8: ldp x10, x11, [sp], #16
+ 0xa8c137ec, // 0x0ec: ldp x12, x13, [sp], #16
+ 0xa8c13fee, // 0x0f0: ldp x14, x15, [sp], #16
+ 0xa8c153f3, // 0x0f4: ldp x19, x20, [sp], #16
+ 0xa8c15bf5, // 0x0f8: ldp x21, x22, [sp], #16
+ 0xa8c163f7, // 0x0fc: ldp x23, x24, [sp], #16
+ 0xa8c16bf9, // 0x100: ldp x25, x26, [sp], #16
+ 0xa8c173fb, // 0x104: ldp x27, x28, [sp], #16
+ 0xa8c17bfd, // 0x108: ldp x29, x30, [sp], #16
+ 0xd65f0220, // 0x10c: ret x17
+ 0x01234567, // 0x110: Lreentry_fn_ptr:
+ 0xdeadbeef, // 0x114: .quad 0
+ 0x98765432, // 0x118: Lcallbackmgr:
+ 0xcafef00d // 0x11c: .quad 0
+ };
+
+ const unsigned ReentryFnAddrOffset = 0x110;
+ const unsigned CallbackMgrAddrOffset = 0x118;
+
+ memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode));
+ memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn));
+ memcpy(ResolverMem + CallbackMgrAddrOffset, &CallbackMgr,
+ sizeof(CallbackMgr));
+}
+
+void OrcAArch64::writeTrampolines(uint8_t *TrampolineMem, void *ResolverAddr,
+ unsigned NumTrampolines) {
+
+ unsigned OffsetToPtr = alignTo(NumTrampolines * TrampolineSize, 8);
+
+ memcpy(TrampolineMem + OffsetToPtr, &ResolverAddr, sizeof(void *));
+
+ // OffsetToPtr is actually the offset from the PC for the 2nd instruction, so
+ // subtract 32-bits.
+ OffsetToPtr -= 4;
+
+ uint32_t *Trampolines = reinterpret_cast<uint32_t *>(TrampolineMem);
+
+ for (unsigned I = 0; I < NumTrampolines; ++I, OffsetToPtr -= TrampolineSize) {
+ Trampolines[3 * I + 0] = 0xaa1e03f1; // mov x17, x30
+ Trampolines[3 * I + 1] = 0x58000010 | (OffsetToPtr << 3); // mov x16, Lptr
+ Trampolines[3 * I + 2] = 0xd63f0200; // blr x16
+ }
+
+}
+
+Error OrcAArch64::emitIndirectStubsBlock(IndirectStubsInfo &StubsInfo,
+ unsigned MinStubs,
+ void *InitialPtrVal) {
+ // Stub format is:
+ //
+ // .section __orc_stubs
+ // stub1:
+ // ldr x0, ptr1 ; PC-rel load of ptr1
+ // br x0 ; Jump to resolver
+ // stub2:
+ // ldr x0, ptr2 ; PC-rel load of ptr2
+ // br x0 ; Jump to resolver
+ //
+ // ...
+ //
+ // .section __orc_ptrs
+ // ptr1:
+ // .quad 0x0
+ // ptr2:
+ // .quad 0x0
+ //
+ // ...
+
+ const unsigned StubSize = IndirectStubsInfo::StubSize;
+
+ // Emit at least MinStubs, rounded up to fill the pages allocated.
+ unsigned PageSize = sys::Process::getPageSize();
+ unsigned NumPages = ((MinStubs * StubSize) + (PageSize - 1)) / PageSize;
+ unsigned NumStubs = (NumPages * PageSize) / StubSize;
+
+ // Allocate memory for stubs and pointers in one call.
+ std::error_code EC;
+ auto StubsMem = sys::OwningMemoryBlock(sys::Memory::allocateMappedMemory(
+ 2 * NumPages * PageSize, nullptr,
+ sys::Memory::MF_READ | sys::Memory::MF_WRITE, EC));
+
+ if (EC)
+ return errorCodeToError(EC);
+
+ // Create separate MemoryBlocks representing the stubs and pointers.
+ sys::MemoryBlock StubsBlock(StubsMem.base(), NumPages * PageSize);
+ sys::MemoryBlock PtrsBlock(static_cast<char *>(StubsMem.base()) +
+ NumPages * PageSize,
+ NumPages * PageSize);
+
+ // Populate the stubs page stubs and mark it executable.
+ uint64_t *Stub = reinterpret_cast<uint64_t *>(StubsBlock.base());
+ uint64_t PtrOffsetField = static_cast<uint64_t>(NumPages * PageSize)
+ << 3;
+
+ for (unsigned I = 0; I < NumStubs; ++I)
+ Stub[I] = 0xd61f020058000010 | PtrOffsetField;
+
+ if (auto EC = sys::Memory::protectMappedMemory(
+ StubsBlock, sys::Memory::MF_READ | sys::Memory::MF_EXEC))
+ return errorCodeToError(EC);
+
+ // Initialize all pointers to point at FailureAddress.
+ void **Ptr = reinterpret_cast<void **>(PtrsBlock.base());
+ for (unsigned I = 0; I < NumStubs; ++I)
+ Ptr[I] = InitialPtrVal;
+
+ StubsInfo = IndirectStubsInfo(NumStubs, std::move(StubsMem));
+
+ return Error::success();
+}
+
+void OrcX86_64_Base::writeTrampolines(uint8_t *TrampolineMem,
+ void *ResolverAddr,
+ unsigned NumTrampolines) {
+
+ unsigned OffsetToPtr = NumTrampolines * TrampolineSize;
+
+ memcpy(TrampolineMem + OffsetToPtr, &ResolverAddr, sizeof(void *));
+
+ uint64_t *Trampolines = reinterpret_cast<uint64_t *>(TrampolineMem);
+ uint64_t CallIndirPCRel = 0xf1c40000000015ff;
+
+ for (unsigned I = 0; I < NumTrampolines; ++I, OffsetToPtr -= TrampolineSize)
+ Trampolines[I] = CallIndirPCRel | ((OffsetToPtr - 6) << 16);
+}
+
+Error OrcX86_64_Base::emitIndirectStubsBlock(IndirectStubsInfo &StubsInfo,
+ unsigned MinStubs,
+ void *InitialPtrVal) {
+ // Stub format is:
+ //
+ // .section __orc_stubs
+ // stub1:
+ // jmpq *ptr1(%rip)
+ // .byte 0xC4 ; <- Invalid opcode padding.
+ // .byte 0xF1
+ // stub2:
+ // jmpq *ptr2(%rip)
+ //
+ // ...
+ //
+ // .section __orc_ptrs
+ // ptr1:
+ // .quad 0x0
+ // ptr2:
+ // .quad 0x0
+ //
+ // ...
+
+ const unsigned StubSize = IndirectStubsInfo::StubSize;
+
+ // Emit at least MinStubs, rounded up to fill the pages allocated.
+ unsigned PageSize = sys::Process::getPageSize();
+ unsigned NumPages = ((MinStubs * StubSize) + (PageSize - 1)) / PageSize;
+ unsigned NumStubs = (NumPages * PageSize) / StubSize;
+
+ // Allocate memory for stubs and pointers in one call.
+ std::error_code EC;
+ auto StubsMem = sys::OwningMemoryBlock(sys::Memory::allocateMappedMemory(
+ 2 * NumPages * PageSize, nullptr,
+ sys::Memory::MF_READ | sys::Memory::MF_WRITE, EC));
+
+ if (EC)
+ return errorCodeToError(EC);
+
+ // Create separate MemoryBlocks representing the stubs and pointers.
+ sys::MemoryBlock StubsBlock(StubsMem.base(), NumPages * PageSize);
+ sys::MemoryBlock PtrsBlock(static_cast<char *>(StubsMem.base()) +
+ NumPages * PageSize,
+ NumPages * PageSize);
+
+ // Populate the stubs page stubs and mark it executable.
+ uint64_t *Stub = reinterpret_cast<uint64_t *>(StubsBlock.base());
+ uint64_t PtrOffsetField = static_cast<uint64_t>(NumPages * PageSize - 6)
+ << 16;
+ for (unsigned I = 0; I < NumStubs; ++I)
+ Stub[I] = 0xF1C40000000025ff | PtrOffsetField;
+
+ if (auto EC = sys::Memory::protectMappedMemory(
+ StubsBlock, sys::Memory::MF_READ | sys::Memory::MF_EXEC))
+ return errorCodeToError(EC);
+
+ // Initialize all pointers to point at FailureAddress.
+ void **Ptr = reinterpret_cast<void **>(PtrsBlock.base());
+ for (unsigned I = 0; I < NumStubs; ++I)
+ Ptr[I] = InitialPtrVal;
+
+ StubsInfo = IndirectStubsInfo(NumStubs, std::move(StubsMem));
+
+ return Error::success();
+}
+
+void OrcX86_64_SysV::writeResolverCode(uint8_t *ResolverMem,
+ JITReentryFn ReentryFn,
+ void *CallbackMgr) {
+
+ const uint8_t ResolverCode[] = {
+ // resolver_entry:
+ 0x55, // 0x00: pushq %rbp
+ 0x48, 0x89, 0xe5, // 0x01: movq %rsp, %rbp
+ 0x50, // 0x04: pushq %rax
+ 0x53, // 0x05: pushq %rbx
+ 0x51, // 0x06: pushq %rcx
+ 0x52, // 0x07: pushq %rdx
+ 0x56, // 0x08: pushq %rsi
+ 0x57, // 0x09: pushq %rdi
+ 0x41, 0x50, // 0x0a: pushq %r8
+ 0x41, 0x51, // 0x0c: pushq %r9
+ 0x41, 0x52, // 0x0e: pushq %r10
+ 0x41, 0x53, // 0x10: pushq %r11
+ 0x41, 0x54, // 0x12: pushq %r12
+ 0x41, 0x55, // 0x14: pushq %r13
+ 0x41, 0x56, // 0x16: pushq %r14
+ 0x41, 0x57, // 0x18: pushq %r15
+ 0x48, 0x81, 0xec, 0x08, 0x02, 0x00, 0x00, // 0x1a: subq 0x208, %rsp
+ 0x48, 0x0f, 0xae, 0x04, 0x24, // 0x21: fxsave64 (%rsp)
+ 0x48, 0xbf, // 0x26: movabsq <CBMgr>, %rdi
+
+ // 0x28: Callback manager addr.
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+ 0x48, 0x8b, 0x75, 0x08, // 0x30: movq 8(%rbp), %rsi
+ 0x48, 0x83, 0xee, 0x06, // 0x34: subq $6, %rsi
+ 0x48, 0xb8, // 0x38: movabsq <REntry>, %rax
+
+ // 0x3a: JIT re-entry fn addr:
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+ 0xff, 0xd0, // 0x42: callq *%rax
+ 0x48, 0x89, 0x45, 0x08, // 0x44: movq %rax, 8(%rbp)
+ 0x48, 0x0f, 0xae, 0x0c, 0x24, // 0x48: fxrstor64 (%rsp)
+ 0x48, 0x81, 0xc4, 0x08, 0x02, 0x00, 0x00, // 0x4d: addq 0x208, %rsp
+ 0x41, 0x5f, // 0x54: popq %r15
+ 0x41, 0x5e, // 0x56: popq %r14
+ 0x41, 0x5d, // 0x58: popq %r13
+ 0x41, 0x5c, // 0x5a: popq %r12
+ 0x41, 0x5b, // 0x5c: popq %r11
+ 0x41, 0x5a, // 0x5e: popq %r10
+ 0x41, 0x59, // 0x60: popq %r9
+ 0x41, 0x58, // 0x62: popq %r8
+ 0x5f, // 0x64: popq %rdi
+ 0x5e, // 0x65: popq %rsi
+ 0x5a, // 0x66: popq %rdx
+ 0x59, // 0x67: popq %rcx
+ 0x5b, // 0x68: popq %rbx
+ 0x58, // 0x69: popq %rax
+ 0x5d, // 0x6a: popq %rbp
+ 0xc3, // 0x6b: retq
+ };
+
+ const unsigned ReentryFnAddrOffset = 0x3a;
+ const unsigned CallbackMgrAddrOffset = 0x28;
+
+ memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode));
+ memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn));
+ memcpy(ResolverMem + CallbackMgrAddrOffset, &CallbackMgr,
+ sizeof(CallbackMgr));
+}
+
+void OrcX86_64_Win32::writeResolverCode(uint8_t *ResolverMem,
+ JITReentryFn ReentryFn,
+ void *CallbackMgr) {
+
+ // resolverCode is similar to OrcX86_64 with differences specific to windows x64 calling convention:
+ // arguments go into rcx, rdx and come in reverse order, shadow space allocation on stack
+ const uint8_t ResolverCode[] = {
+ // resolver_entry:
+ 0x55, // 0x00: pushq %rbp
+ 0x48, 0x89, 0xe5, // 0x01: movq %rsp, %rbp
+ 0x50, // 0x04: pushq %rax
+ 0x53, // 0x05: pushq %rbx
+ 0x51, // 0x06: pushq %rcx
+ 0x52, // 0x07: pushq %rdx
+ 0x56, // 0x08: pushq %rsi
+ 0x57, // 0x09: pushq %rdi
+ 0x41, 0x50, // 0x0a: pushq %r8
+ 0x41, 0x51, // 0x0c: pushq %r9
+ 0x41, 0x52, // 0x0e: pushq %r10
+ 0x41, 0x53, // 0x10: pushq %r11
+ 0x41, 0x54, // 0x12: pushq %r12
+ 0x41, 0x55, // 0x14: pushq %r13
+ 0x41, 0x56, // 0x16: pushq %r14
+ 0x41, 0x57, // 0x18: pushq %r15
+ 0x48, 0x81, 0xec, 0x08, 0x02, 0x00, 0x00, // 0x1a: subq 0x208, %rsp
+ 0x48, 0x0f, 0xae, 0x04, 0x24, // 0x21: fxsave64 (%rsp)
+
+ 0x48, 0xb9, // 0x26: movabsq <CBMgr>, %rcx
+ // 0x28: Callback manager addr.
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+ 0x48, 0x8B, 0x55, 0x08, // 0x30: mov rdx, [rbp+0x8]
+ 0x48, 0x83, 0xea, 0x06, // 0x34: sub rdx, 0x6
+
+ 0x48, 0xb8, // 0x38: movabsq <REntry>, %rax
+ // 0x3a: JIT re-entry fn addr:
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+ // 0x42: sub rsp, 0x20 (Allocate shadow space)
+ 0x48, 0x83, 0xEC, 0x20,
+ 0xff, 0xd0, // 0x46: callq *%rax
+
+ // 0x48: add rsp, 0x20 (Free shadow space)
+ 0x48, 0x83, 0xC4, 0x20,
+
+ 0x48, 0x89, 0x45, 0x08, // 0x4C: movq %rax, 8(%rbp)
+ 0x48, 0x0f, 0xae, 0x0c, 0x24, // 0x50: fxrstor64 (%rsp)
+ 0x48, 0x81, 0xc4, 0x08, 0x02, 0x00, 0x00, // 0x55: addq 0x208, %rsp
+ 0x41, 0x5f, // 0x5C: popq %r15
+ 0x41, 0x5e, // 0x5E: popq %r14
+ 0x41, 0x5d, // 0x60: popq %r13
+ 0x41, 0x5c, // 0x62: popq %r12
+ 0x41, 0x5b, // 0x64: popq %r11
+ 0x41, 0x5a, // 0x66: popq %r10
+ 0x41, 0x59, // 0x68: popq %r9
+ 0x41, 0x58, // 0x6a: popq %r8
+ 0x5f, // 0x6c: popq %rdi
+ 0x5e, // 0x6d: popq %rsi
+ 0x5a, // 0x6e: popq %rdx
+ 0x59, // 0x6f: popq %rcx
+ 0x5b, // 0x70: popq %rbx
+ 0x58, // 0x71: popq %rax
+ 0x5d, // 0x72: popq %rbp
+ 0xc3, // 0x73: retq
+ };
+
+
+ const unsigned ReentryFnAddrOffset = 0x3a;
+ const unsigned CallbackMgrAddrOffset = 0x28;
+
+ memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode));
+ memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn));
+ memcpy(ResolverMem + CallbackMgrAddrOffset, &CallbackMgr,
+ sizeof(CallbackMgr));
+}
+
+void OrcI386::writeResolverCode(uint8_t *ResolverMem, JITReentryFn ReentryFn,
+ void *CallbackMgr) {
+
+ const uint8_t ResolverCode[] = {
+ // resolver_entry:
+ 0x55, // 0x00: pushl %ebp
+ 0x89, 0xe5, // 0x01: movl %esp, %ebp
+ 0x54, // 0x03: pushl %esp
+ 0x83, 0xe4, 0xf0, // 0x04: andl $-0x10, %esp
+ 0x50, // 0x07: pushl %eax
+ 0x53, // 0x08: pushl %ebx
+ 0x51, // 0x09: pushl %ecx
+ 0x52, // 0x0a: pushl %edx
+ 0x56, // 0x0b: pushl %esi
+ 0x57, // 0x0c: pushl %edi
+ 0x81, 0xec, 0x18, 0x02, 0x00, 0x00, // 0x0d: subl $0x218, %esp
+ 0x0f, 0xae, 0x44, 0x24, 0x10, // 0x13: fxsave 0x10(%esp)
+ 0x8b, 0x75, 0x04, // 0x18: movl 0x4(%ebp), %esi
+ 0x83, 0xee, 0x05, // 0x1b: subl $0x5, %esi
+ 0x89, 0x74, 0x24, 0x04, // 0x1e: movl %esi, 0x4(%esp)
+ 0xc7, 0x04, 0x24, 0x00, 0x00, 0x00,
+ 0x00, // 0x22: movl <cbmgr>, (%esp)
+ 0xb8, 0x00, 0x00, 0x00, 0x00, // 0x29: movl <reentry>, %eax
+ 0xff, 0xd0, // 0x2e: calll *%eax
+ 0x89, 0x45, 0x04, // 0x30: movl %eax, 0x4(%ebp)
+ 0x0f, 0xae, 0x4c, 0x24, 0x10, // 0x33: fxrstor 0x10(%esp)
+ 0x81, 0xc4, 0x18, 0x02, 0x00, 0x00, // 0x38: addl $0x218, %esp
+ 0x5f, // 0x3e: popl %edi
+ 0x5e, // 0x3f: popl %esi
+ 0x5a, // 0x40: popl %edx
+ 0x59, // 0x41: popl %ecx
+ 0x5b, // 0x42: popl %ebx
+ 0x58, // 0x43: popl %eax
+ 0x8b, 0x65, 0xfc, // 0x44: movl -0x4(%ebp), %esp
+ 0x5d, // 0x48: popl %ebp
+ 0xc3 // 0x49: retl
+ };
+
+ const unsigned ReentryFnAddrOffset = 0x2a;
+ const unsigned CallbackMgrAddrOffset = 0x25;
+
+ memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode));
+ memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn));
+ memcpy(ResolverMem + CallbackMgrAddrOffset, &CallbackMgr,
+ sizeof(CallbackMgr));
+}
+
+void OrcI386::writeTrampolines(uint8_t *TrampolineMem, void *ResolverAddr,
+ unsigned NumTrampolines) {
+
+ uint64_t CallRelImm = 0xF1C4C400000000e8;
+ uint64_t Resolver = reinterpret_cast<uint64_t>(ResolverAddr);
+ uint64_t ResolverRel =
+ Resolver - reinterpret_cast<uint64_t>(TrampolineMem) - 5;
+
+ uint64_t *Trampolines = reinterpret_cast<uint64_t *>(TrampolineMem);
+ for (unsigned I = 0; I < NumTrampolines; ++I, ResolverRel -= TrampolineSize)
+ Trampolines[I] = CallRelImm | (ResolverRel << 8);
+}
+
+Error OrcI386::emitIndirectStubsBlock(IndirectStubsInfo &StubsInfo,
+ unsigned MinStubs, void *InitialPtrVal) {
+ // Stub format is:
+ //
+ // .section __orc_stubs
+ // stub1:
+ // jmpq *ptr1
+ // .byte 0xC4 ; <- Invalid opcode padding.
+ // .byte 0xF1
+ // stub2:
+ // jmpq *ptr2
+ //
+ // ...
+ //
+ // .section __orc_ptrs
+ // ptr1:
+ // .quad 0x0
+ // ptr2:
+ // .quad 0x0
+ //
+ // ...
+
+ const unsigned StubSize = IndirectStubsInfo::StubSize;
+
+ // Emit at least MinStubs, rounded up to fill the pages allocated.
+ unsigned PageSize = sys::Process::getPageSize();
+ unsigned NumPages = ((MinStubs * StubSize) + (PageSize - 1)) / PageSize;
+ unsigned NumStubs = (NumPages * PageSize) / StubSize;
+
+ // Allocate memory for stubs and pointers in one call.
+ std::error_code EC;
+ auto StubsMem = sys::OwningMemoryBlock(sys::Memory::allocateMappedMemory(
+ 2 * NumPages * PageSize, nullptr,
+ sys::Memory::MF_READ | sys::Memory::MF_WRITE, EC));
+
+ if (EC)
+ return errorCodeToError(EC);
+
+ // Create separate MemoryBlocks representing the stubs and pointers.
+ sys::MemoryBlock StubsBlock(StubsMem.base(), NumPages * PageSize);
+ sys::MemoryBlock PtrsBlock(static_cast<char *>(StubsMem.base()) +
+ NumPages * PageSize,
+ NumPages * PageSize);
+
+ // Populate the stubs page stubs and mark it executable.
+ uint64_t *Stub = reinterpret_cast<uint64_t *>(StubsBlock.base());
+ uint64_t PtrAddr = reinterpret_cast<uint64_t>(PtrsBlock.base());
+ for (unsigned I = 0; I < NumStubs; ++I, PtrAddr += 4)
+ Stub[I] = 0xF1C40000000025ff | (PtrAddr << 16);
+
+ if (auto EC = sys::Memory::protectMappedMemory(
+ StubsBlock, sys::Memory::MF_READ | sys::Memory::MF_EXEC))
+ return errorCodeToError(EC);
+
+ // Initialize all pointers to point at FailureAddress.
+ void **Ptr = reinterpret_cast<void **>(PtrsBlock.base());
+ for (unsigned I = 0; I < NumStubs; ++I)
+ Ptr[I] = InitialPtrVal;
+
+ StubsInfo = IndirectStubsInfo(NumStubs, std::move(StubsMem));
+
+ return Error::success();
+}
+
+} // End namespace orc.
+} // End namespace llvm.