Requesting D ABI clarifications

[Gregor Richards]

<preface>
I'm writing a D compiler using C as an intermediary language et cetera 
et cetera http://www.dsource.org/projects/tdc/
</preface>

I have the lofty goal of DMD compatibility on those systems that DMD 
supports, but unfortunately the ABI spec on the page isn't complete ... 
I believe I have everything right (it seems to work) except for:

A) Function calling semantics
	- Some initial tests putting 'this' in %eax generated almost 100% 
compatible code, but there were occasional strange, difficult to trace 
errors - these could just be my mistakes, or I could be doing calling 
semantics improperly.  Is that the only major difference from C calling 
conventions, or is there something else specific I need to do?

B) Exception handling
	- For GNU/Linux, DMD's exception handling is for all intents and 
purposes undocumed ... it mentions that it has a static location for 
exception handling buffers, but that's about it.  I think I should be 
able to get SEH working (I've found a few nice docs on it), but don't 
have much of a base point for GNU/Linux ... all I know is a few symbols 
(_deh_end et al).


Could somebody (Walter?) either explain how these work in DMD or point 
me to where these are explained?  I would really like to be compatible, 
or at least as compatible as possible, with the reference ABI ... 
hopefully this is doable from C (I'm willing to use GCC __attribute__'s 
and inline assembly where necessary, this is how I got a parameter into 
%eax).

Thanks for any response.

  - Gregor Richards