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Moved InvalidateInstructionCache to ARMJITInfo::emitFunctionStub which knows size of stub.

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llvm-svn: 58899
This commit is contained in:
Evan Cheng 2008-11-08 08:16:49 +00:00
parent 7f1eececb4
commit e5b6b3f81f
1 changed files with 21 additions and 22 deletions
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31
lib/Target/ARM/ARMJITInfo.cpp
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@ -111,17 +111,13 @@ extern "C" void ARMCompilationCallbackC(intptr_t StubAddr) {
// stub with:
// ldr pc, [pc,#-4]
// <addr>
bool ok = sys::Memory::setRangeWritable((void*)StubAddr, 8);
if (!ok)
{
if (!sys::Memory::setRangeWritable((void*)StubAddr, 8)) {
cerr << "ERROR: Unable to mark stub writable\n";
abort();
}
*(intptr_t *)StubAddr = 0xe51ff004;
*(intptr_t *)StubAddr = 0xe51ff004; // ldr pc, [pc, #-4]
*(intptr_t *)(StubAddr+4) = NewVal;
ok = sys::Memory::setRangeExecutable((void*)StubAddr, 8);
if (!ok)
{
if (!sys::Memory::setRangeExecutable((void*)StubAddr, 8)) {
cerr << "ERROR: Unable to mark stub executable\n";
abort();
}
@ -142,15 +138,16 @@ void *ARMJITInfo::emitGlobalValueNonLazyPtr(const GlobalValue *GV, void *Ptr,
void *ARMJITInfo::emitFunctionStub(const Function* F, void *Fn,
MachineCodeEmitter &MCE) {
unsigned addr = (intptr_t)Fn;
// 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.
// The stub is 8-byte size and 4-aligned.
MCE.startGVStub(F, 8, 4);
MCE.emitWordLE(0xe51ff004); // LDR PC, [PC,#-4]
MCE.emitWordLE(addr); // addr of function
intptr_t Addr = (intptr_t)MCE.getCurrentPCValue();
MCE.emitWordLE(0xe51ff004); // ldr pc, [pc, #-4]
MCE.emitWordLE((intptr_t)Fn); // addr of function
sys::Memory::InvalidateInstructionCache((void*)Addr, 8);
} else {
// The compilation callback will overwrite the first two words of this
// stub with indirect branch instructions targeting the compiled code.
@ -160,16 +157,18 @@ 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.
MCE.startGVStub(F, 16, 4);
intptr_t Addr = (intptr_t)MCE.getCurrentPCValue();
// Save LR so the callback can determine which stub called it.
// The compilation callback is responsible for popping this prior
// to returning.
MCE.emitWordLE(0xe92d4000); // PUSH {lr}
// Set the return address to go back to the start of this stub
MCE.emitWordLE(0xe24fe00c); // SUB LR, PC, #12
// Invoke the compilation callback
MCE.emitWordLE(0xe51ff004); // LDR PC, [PC,#-4]
// The address of the compilation callback
MCE.emitWordLE(0xe92d4000); // push {lr}
// Set the return address to go back to the start of this stub.
MCE.emitWordLE(0xe24fe00c); // sub lr, pc, #12
// Invoke the compilation callback.
MCE.emitWordLE(0xe51ff004); // ldr pc, [pc, #-4]
// The address of the compilation callback.
MCE.emitWordLE((intptr_t)ARMCompilationCallback);
sys::Memory::InvalidateInstructionCache((void*)Addr, 16);
}
return MCE.finishGVStub(F);