Re: Fwd: Re: Registers used for exception handling on Linux/m68k?

[John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>]

Hi Nathan!

Thanks for the explanations!

On 10/1/20 2:27 PM, Nathan Sidwell wrote:
> do you know what those 2 functions you mention provide on say x86?  Then it might be easier to map onto 68k.

>From [1]:

Register X86TargetLowering::getExceptionPointerRegister(
    const Constant *PersonalityFn) const {
  if (classifyEHPersonality(PersonalityFn) == EHPersonality::CoreCLR)
    return Subtarget.isTarget64BitLP64() ? X86::RDX : X86::EDX;

  return Subtarget.isTarget64BitLP64() ? X86::RAX : X86::EAX;
}

Register X86TargetLowering::getExceptionSelectorRegister(
    const Constant *PersonalityFn) const {
  // Funclet personalities don't use selectors (the runtime does the selection).
  assert(!isFuncletEHPersonality(classifyEHPersonality(PersonalityFn)));
  return Subtarget.isTarget64BitLP64() ? X86::RDX : X86::EDX;
}

Adrian

> [1] https://raw.githubusercontent.com/llvm/llvm-project/master/llvm/lib/Target/X86/X86ISelLowering.cpp

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 .''`.  John Paul Adrian Glaubitz
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