diff options
Diffstat (limited to 'lib/Target/ARM')
| -rw-r--r-- | lib/Target/ARM/ARMJITInfo.cpp | 45 | ||||
| -rw-r--r-- | lib/Target/ARM/ARMJITInfo.h | 4 |
2 files changed, 30 insertions, 19 deletions
diff --git a/lib/Target/ARM/ARMJITInfo.cpp b/lib/Target/ARM/ARMJITInfo.cpp index 7031640471..aa50cfd307 100644 --- a/lib/Target/ARM/ARMJITInfo.cpp +++ b/lib/Target/ARM/ARMJITInfo.cpp @@ -154,15 +154,22 @@ void *ARMJITInfo::emitGlobalValueIndirectSym(const GlobalValue *GV, void *Ptr, return PtrAddr; } +TargetJITInfo::StubLayout ARMJITInfo::getStubLayout() { + // The stub contains up to 3 4-byte instructions, aligned at 4 bytes, and a + // 4-byte address. See emitFunctionStub for details. + StubLayout Result = {16, 4}; + return Result; +} + void *ARMJITInfo::emitFunctionStub(const Function* F, void *Fn, JITCodeEmitter &JCE) { - MachineCodeEmitter::BufferState BS; + void *Addr; // If this is just a call to an external function, emit a branch instead of a // call. The code is the same except for one bit of the last instruction. if (Fn != (void*)(intptr_t)ARMCompilationCallback) { // Branch to the corresponding function addr. if (IsPIC) { - // The stub is 8-byte size and 4-aligned. + // The stub is 16-byte size and 4-aligned. intptr_t LazyPtr = getIndirectSymAddr(Fn); if (!LazyPtr) { // In PIC mode, the function stub is loading a lazy-ptr. @@ -174,30 +181,30 @@ void *ARMJITInfo::emitFunctionStub(const Function* F, void *Fn, errs() << "JIT: Stub emitted at [" << LazyPtr << "] for external function at '" << Fn << "'\n"); } - JCE.startGVStub(BS, F, 16, 4); - intptr_t Addr = (intptr_t)JCE.getCurrentPCValue(); - if (!sys::Memory::setRangeWritable((void*)Addr, 16)) { + JCE.emitAlignment(4); + Addr = (void*)JCE.getCurrentPCValue(); + if (!sys::Memory::setRangeWritable(Addr, 16)) { llvm_unreachable("ERROR: Unable to mark stub writable"); } JCE.emitWordLE(0xe59fc004); // ldr ip, [pc, #+4] JCE.emitWordLE(0xe08fc00c); // L_func$scv: add ip, pc, ip JCE.emitWordLE(0xe59cf000); // ldr pc, [ip] - JCE.emitWordLE(LazyPtr - (Addr+4+8)); // func - (L_func$scv+8) - sys::Memory::InvalidateInstructionCache((void*)Addr, 16); - if (!sys::Memory::setRangeExecutable((void*)Addr, 16)) { + JCE.emitWordLE(LazyPtr - (intptr_t(Addr)+4+8)); // func - (L_func$scv+8) + sys::Memory::InvalidateInstructionCache(Addr, 16); + if (!sys::Memory::setRangeExecutable(Addr, 16)) { llvm_unreachable("ERROR: Unable to mark stub executable"); } } else { // The stub is 8-byte size and 4-aligned. - JCE.startGVStub(BS, F, 8, 4); - intptr_t Addr = (intptr_t)JCE.getCurrentPCValue(); - if (!sys::Memory::setRangeWritable((void*)Addr, 8)) { + JCE.emitAlignment(4); + Addr = (void*)JCE.getCurrentPCValue(); + if (!sys::Memory::setRangeWritable(Addr, 8)) { llvm_unreachable("ERROR: Unable to mark stub writable"); } JCE.emitWordLE(0xe51ff004); // ldr pc, [pc, #-4] JCE.emitWordLE((intptr_t)Fn); // addr of function - sys::Memory::InvalidateInstructionCache((void*)Addr, 8); - if (!sys::Memory::setRangeExecutable((void*)Addr, 8)) { + sys::Memory::InvalidateInstructionCache(Addr, 8); + if (!sys::Memory::setRangeExecutable(Addr, 8)) { llvm_unreachable("ERROR: Unable to mark stub executable"); } } @@ -209,9 +216,9 @@ void *ARMJITInfo::emitFunctionStub(const Function* F, void *Fn, // // Branch and link to the compilation callback. // The stub is 16-byte size and 4-byte aligned. - JCE.startGVStub(BS, F, 16, 4); - intptr_t Addr = (intptr_t)JCE.getCurrentPCValue(); - if (!sys::Memory::setRangeWritable((void*)Addr, 16)) { + JCE.emitAlignment(4); + Addr = (void*)JCE.getCurrentPCValue(); + if (!sys::Memory::setRangeWritable(Addr, 16)) { llvm_unreachable("ERROR: Unable to mark stub writable"); } // Save LR so the callback can determine which stub called it. @@ -224,13 +231,13 @@ void *ARMJITInfo::emitFunctionStub(const Function* F, void *Fn, JCE.emitWordLE(0xe51ff004); // ldr pc, [pc, #-4] // The address of the compilation callback. JCE.emitWordLE((intptr_t)ARMCompilationCallback); - sys::Memory::InvalidateInstructionCache((void*)Addr, 16); - if (!sys::Memory::setRangeExecutable((void*)Addr, 16)) { + sys::Memory::InvalidateInstructionCache(Addr, 16); + if (!sys::Memory::setRangeExecutable(Addr, 16)) { llvm_unreachable("ERROR: Unable to mark stub executable"); } } - return JCE.finishGVStub(BS); + return Addr; } intptr_t ARMJITInfo::resolveRelocDestAddr(MachineRelocation *MR) const { diff --git a/lib/Target/ARM/ARMJITInfo.h b/lib/Target/ARM/ARMJITInfo.h index 7dfeed8b7b..ff332b7ee1 100644 --- a/lib/Target/ARM/ARMJITInfo.h +++ b/lib/Target/ARM/ARMJITInfo.h @@ -61,6 +61,10 @@ namespace llvm { virtual void *emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr, JITCodeEmitter &JCE); + // getStubLayout - Returns the size and alignment of the largest call stub + // on ARM. + virtual StubLayout getStubLayout(); + /// emitFunctionStub - Use the specified JITCodeEmitter object to emit a /// small native function that simply calls the function at the specified /// address. |