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call_lock
2017 Mar 04
2
Figuring out return address of a call
...ff ff callq func
105: .marker
100: ff d0 callq *%rax
102: .marker
My approach is to find call addresses through a function pass, split the
basic block *after* the call instruction, then generate a BlockAddress
as follows:
if (auto CL = dyn_cast<CallInst>(&*I)) {
BasicBlock *callblock = (*CL)->getParent();
BasicBlock *postblock =
callblock->splitBasicBlock((*CL)->getNextNode());
BlockAddress *retaddr = BlockAddress::get(postblock);
...
}
This works well except that the BlockAddress is slightly off. I run into
the problem that during code generation, my BlockA...