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Re: ptrace for mips n32 and n64
On Mar 14, 2003, Daniel Jacobowitz <drow at mvista dot com> wrote:
> On Fri, Mar 14, 2003 at 11:35:42AM -0300, Alexandre Oliva wrote:
>> Yay. Lots of code duplication. I'm sure Uli will love this patch.
>> :-/ Ok? (the point being that ptrace must take as argument and return
>> 64-bit values on n32)
> Why must it?
Because that's the ABI defined by the kernel, as much as I dislike
it. Of course, glibc could adapt the interface and return longs even
though the kernel gives it a long long, and pass a long long where it
gets just a long. I don't know much about the interface of ptrace,
anyway. I just did what Kevin told me he needed for his debugging
code to work.
> I can't think of any reason for it to take 64-bit
> values. It'll also be a tremendous headache, since you'll have to cast
> any pointers passed to ptrace.
If you pass a pointer to ptrace, it will be sign-extended to 64 bits,
just as it should. No hassle.
--
Alexandre Oliva Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer aoliva at {redhat dot com, gcc.gnu.org}
CS PhD student at IC-Unicamp oliva at {lsd dot ic dot unicamp dot br, gnu.org}
Free Software Evangelist Professional serial bug killer