help: question for porting gas/ld to MIPS-X3

help: question for porting gas/ld to MIPS-X3

[David Zhang]

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Hi all,
   I'm trying to port Gas and Ld to a MIPS-X3 processor. Is there a port to 
X3 already under way?
   I have found the gas/ld port examples in the maillist. But I am a 
novice, the testsuite confused me. I don't know what's function of the 
"*.s" and "*.d" files in the testsuite directory and how to build 
testsuite. I can't find the doc introducing them. Could you give me some 
pointers in this regard?
   Thanks a lot.




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Testing (was: Re: help: question for porting gas/ld to MIPS-X3)

[Hans-Peter Nilsson]

On Sun, 24 Feb 2002, David Zhang wrote:

>    I have found the gas/ld port examples in the maillist. But I am a
> novice, the testsuite confused me. I don't know what's function of the
> "*.s" and "*.d" files in the testsuite directory and how to build
> testsuite. I can't find the doc introducing them. Could you give me some
> pointers in this regard?

(To all: There really should be a document describing this
procedure, besides the generalizations in the dejagnu manual at
<URL:http://www.gnu.org/manual/dejagnu-1.3/dejagnu.html>.
Maybe there is; if so I've only forgotten where I've read this.
Maybe someone told me or I read it myself on this list long ago;
I honestly don't remember.)

I think you are referring to the test files for run_dump_tests,
as run from for example ld/testsuite/ld-mips-elf/mips-elf.exp
(or better IMHO: ld/testsuite/ld-mmix/mmix.exp).

You write the .s file(s) yourself, as you add functionality or
investigate a bug that is causing errors or incorrect object
files to be generated by gas or ld.  Then you write the head
part of the .d file.  You have to decide on what kind of
"inspection program" you want to run for the test.  The most
common ones are readelf and objdump.  See run_dump_test in
ld/testsuite/lib/ld-lib.exp for what little documentation there
is about this.

The simplest way forward then is that you run just that test,
for example for ld/testsuite/ld-mmix/bpo-1.d with
 "make check-ld RUNTESTFLAGS=mmix.exp=bpo-1".
The test will fail at this point because the expected output is
empty.  The point is that you use the output generated in
ld/tmpdir/dump.out when running the test, and paste it at the
end of the .d file. In the text you pasted in, you have to add \
escapes in front of regexp metacharacters, and you should
replace the output parts that are likely to change and that are
uninteresting for your test, with generalized regexps.

You don't have to do it the way it's described in the paragraph
above (I've just found that to be easiest for me); you can of
course for example run the "inspection program" manually or
cut-and-paste and use the command lines logged in
ld/testsuite/ld.log.

Note the "#..." and "#pass" run_dump_test match features.
Also, note that the gas run_dump_test differs from the ld one.

A run_dump_test doesn't cover all types of tests, and some
features are lacking, for example the ability to test that some
specific output does *not* appear.  One other type of test is
that invalid input is caught correctly in the assembler.  It is
best done with a "dg" test.  Perhaps the best reading for that
is /usr/share/dejagnu/dg.exp (your filepaths may vary) or by
example from grepping for dg-do in the gas testsuited.  I think
it's also described to some extent in the dejagnu manual.

Hope this helps.  If there's anything that I didn't explain good
enough, please don't hesitate to ask (on the list, as always).

brgds, H-P

Re: help: question for porting gas/ld to MIPS-X3

[Eric Christopher]

Hello David,

>    I'm trying to port Gas and Ld to a MIPS-X3 processor. Is there a port to 
> X3 already under way?

I've not heard of the X3 so I cannot tell you whether or not a port is
underway - no port currently exists to my knowledge though. I see that
someone else has already answered your question about the testsuite, so
I'll just suggest that you scan the existing mips gas testsuite to come
up with ideas for your own tests. (src/gas/testsuite/gas/mips/*.[sd]) 

Good Luck.

-eric

-- 
I will not use abbrev.

Re: Testing (was: Re: help: question for porting gas/ld to MIPS-X3)

[Nick Clifton]

Hi Hans-Peter,

> (To all: There really should be a document describing this
> procedure, besides the generalizations in the dejagnu manual at
> <URL:http://www.gnu.org/manual/dejagnu-1.3/dejagnu.html>.
> Maybe there is; if so I've only forgotten where I've read this.
> Maybe someone told me or I read it myself on this list long ago;
> I honestly don't remember.)

There is some documentation in gas/doc/internals.texi.  Perhaps this
is what you were thinking of ?

Cheers
        Nick