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Correct PIC function stub codegen.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59006 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -19,6 +19,7 @@
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#include "llvm/Function.h"
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#include "llvm/CodeGen/MachineCodeEmitter.h"
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#include "llvm/Config/alloca.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/Streams.h"
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#include "llvm/System/Memory.h"
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#include <cstdlib>
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@ -133,7 +134,9 @@ void *ARMJITInfo::emitGlobalValueIndirectSym(const GlobalValue *GV, void *Ptr,
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MachineCodeEmitter &MCE) {
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MCE.startGVStub(GV, 4, 4);
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MCE.emitWordLE((intptr_t)Ptr);
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return MCE.finishGVStub(GV);
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void *PtrAddr = MCE.finishGVStub(GV);
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addIndirectSymAddr(Ptr, (intptr_t)PtrAddr);
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return PtrAddr;
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}
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void *ARMJITInfo::emitFunctionStub(const Function* F, void *Fn,
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@ -142,12 +145,34 @@ void *ARMJITInfo::emitFunctionStub(const Function* F, void *Fn,
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// call. The code is the same except for one bit of the last instruction.
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if (Fn != (void*)(intptr_t)ARMCompilationCallback) {
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// Branch to the corresponding function addr.
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// The stub is 8-byte size and 4-aligned.
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MCE.startGVStub(F, 8, 4);
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intptr_t Addr = (intptr_t)MCE.getCurrentPCValue();
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MCE.emitWordLE(0xe51ff004); // ldr pc, [pc, #-4]
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MCE.emitWordLE((intptr_t)Fn); // addr of function
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sys::Memory::InvalidateInstructionCache((void*)Addr, 8);
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if (IsPIC) {
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// The stub is 8-byte size and 4-aligned.
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intptr_t LazyPtr = getIndirectSymAddr(Fn);
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if (!LazyPtr) {
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// In PIC mode, the function stub is loading a lazy-ptr.
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LazyPtr= (intptr_t)emitGlobalValueIndirectSym((GlobalValue*)F, Fn, MCE);
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if (F)
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DOUT << "JIT: Indirect symbol emitted at [" << LazyPtr << "] for GV '"
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<< F->getName() << "'\n";
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else
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DOUT << "JIT: Stub emitted at [" << LazyPtr
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<< "] for external function at '" << Fn << "'\n";
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}
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MCE.startGVStub(F, 16, 4);
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intptr_t Addr = (intptr_t)MCE.getCurrentPCValue();
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MCE.emitWordLE(0xe59fc004); // ldr pc, [pc, #+4]
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MCE.emitWordLE(0xe08fc00c); // L_func$scv: add ip, pc, ip
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MCE.emitWordLE(0xe59cf000); // ldr pc, [ip]
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MCE.emitWordLE(LazyPtr - (Addr+4+8)); // func - (L_func$scv+8)
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sys::Memory::InvalidateInstructionCache((void*)Addr, 16);
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} else {
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// The stub is 8-byte size and 4-aligned.
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MCE.startGVStub(F, 8, 4);
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intptr_t Addr = (intptr_t)MCE.getCurrentPCValue();
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MCE.emitWordLE(0xe51ff004); // ldr pc, [pc, #-4]
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MCE.emitWordLE((intptr_t)Fn); // addr of function
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sys::Memory::InvalidateInstructionCache((void*)Addr, 8);
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}
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} else {
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// The compilation callback will overwrite the first two words of this
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// stub with indirect branch instructions targeting the compiled code.
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@ -37,6 +37,10 @@ namespace llvm {
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// PCLabelMap - A map from PC labels to addresses.
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DenseMap<unsigned, intptr_t> PCLabelMap;
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// Sym2IndirectSymMap - A map from symbol (GlobalValue and ExternalSymbol)
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// addresses to their indirect symbol addresses.
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DenseMap<void*, intptr_t> Sym2IndirectSymMap;
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// IsPIC - True if the relocation model is PIC. This is used to determine
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// how to codegen function stubs.
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bool IsPIC;
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@ -147,6 +151,22 @@ namespace llvm {
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PCLabelMap.insert(std::make_pair(Id, Addr));
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}
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/// getIndirectSymAddr - Retrieve the address of the indirect symbol of the
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/// specified symbol located at address. Returns 0 if the indirect symbol
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/// has not been emitted.
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intptr_t getIndirectSymAddr(void *Addr) const {
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DenseMap<void*,intptr_t>::const_iterator I= Sym2IndirectSymMap.find(Addr);
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if (I != Sym2IndirectSymMap.end())
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return I->second;
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return 0;
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}
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/// addIndirectSymAddr - Add a mapping from address of an emitted symbol to
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/// its indirect symbol address.
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void addIndirectSymAddr(void *SymAddr, intptr_t IndSymAddr) {
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Sym2IndirectSymMap.insert(std::make_pair(SymAddr, IndSymAddr));
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}
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private:
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/// resolveRelocDestAddr - Resolve the resulting address of the relocation
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/// if it's not already solved. Constantpool entries must be resolved by
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