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