Subject:
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Re: NQC v. LegOS / size
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 9 Feb 1999 22:05:15 GMT
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Original-From:
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John A. Tamplin <JAT@TRAVELLER.COMspamcake>
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Viewed:
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1452 times
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On Tue, 9 Feb 1999, dave madden wrote:
> That's where they would be, if there were any. I don't think GCC has
> code for the helpers; as I recall, it relies on the native C compiler
> to produce object files which are archived into libgcc.a. For
> systems where GCC *is* the native compiler, it either has to be able
> to "open code" the operations (i.e. express them as raw machine
> instructions), or the helpers have to have been provided by some other
> means. (I think the creation of libgcc.a is where some people have
> been having trouble building the cross-compiler.)
In most cross-compilers, there is assembly code for those helper
functions. In EGCS, those are in config/h8300/lib1funcs.asm.
> Can your installation of gcc/egcs compile _& LINK_ this program:
>
> int main( )
> {
> extern int x;
> extern int y;
>
> return x / y;
> }
>
> Mine tries to call a helper function for the divide, and I don't have
> it anywhere in the material from EGCS that I was able to build &
> install.
It calls __divhi3, which is defined in config/h8300/lib1funcs.asm. I
built egcs-1.1.1 without any changes (that I remember :), and it put
those in libgcc1.a, which then gets merged into libgcc.a. In addition
to the 16-bit routines your example uses, it also has 32-bit multiply and
divide functions (__mulsi3, etc). I don't have it still around, but I am
pretty sure egcs-1.1a also properly handled this. I have not ever built
gcc 2.8 or egcs-1.1 as a cross compiler for the H8, so if you are using
one of those it may not have the helper functions.
Did you configure it as a cross compiler (setting --target h8300-hitachi-hms
and --host to whatever your host platform is)?
John A. Tamplin Traveller Information Services
jat@Traveller.COM 2104 West Ferry Way
256/705-7007 - FAX 256/705-7100 Huntsville, AL 35801
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 3 Replies:
 | | Re: NQC v. LegOS / size
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| (...) There are two problems with lib1funcs.asm. First, all the functions are in one .asm file. That means you have the code for all math functions even if you use only one of them. Second, most of the routines are already in ROM, so if you can take (...) (25 years ago, 9-Feb-99, to lugnet.robotics)
| | | Re: NQC v. LegOS / size
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| =>From: "John A. Tamplin" <jat@Traveller.COM> =>... =>It calls __divhi3, which is defined in config/h8300/lib1funcs.asm. I =>built egcs-1.1.1 without any changes (that I remember :), and it put =>those in libgcc1.a, which then gets merged into (...) (25 years ago, 10-Feb-99, to lugnet.robotics)
| | | Re: NQC v. LegOS / size
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| Hi John, (...) I'm currently working on compiler details with Chris. He sent me some patches to produce cleaner code for ROM calls (register allocation issues), and after we have consolidated these, there'll be both patches and binary releases for (...) (25 years ago, 10-Feb-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: NQC v. LegOS / size
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| =>From: "John A. Tamplin" <jat@Traveller.COM> =>... =>On Tue, 9 Feb 1999, dave madden wrote: => =>> Yes, the H8 divide instruction can only do (16 bits)/(8 bits), so GCC =>> calls a helper routine [...] => =>Are you linking libgcc.a? I believe it (...) (25 years ago, 9-Feb-99, to lugnet.robotics)
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