Re: position independent code on MIPS

Re: position independent code on MIPS

[Paul Kohout]

I see. So the -mabicalls is the only way to get the code position
independent.

So what would a dynamic linker have to do differently using "-mabicalls
-fpic -G 0" versus "-membedded-pic"? I assume that there would be some
processing of relocation tables. Is this documented somewhere?

Thanks again,
-Paul

>>> Ian Lance Taylor <ian@airs.com> 01/16/06 2:51 PM >>>
"Paul Kohout" <pkohout@evitechnology.com> writes:

> How do I generate position independent code using a gcc v4.0.2
> cross-compiler targeted for the mips-elf platform?
> 
> In the past, I have used the -membedded-pic option with gcc v3.3.1,
but
> this seems to have been deprecated in v4.0.2. I tried using the
-fpic
> option, but it does not seem to create any dynamic relocation table
> entries for the .text section, just for data sections. Also, I've
tried
> using the -mabicalls option, but I can't get it to work either.

It normally works to use -mabicalls -fpic -G 0.

But note that this is not the same as -membedded-pic.

Ian

Re: position independent code on MIPS

[Ian Lance Taylor]

"Paul Kohout" <pkohout@evitechnology.com> writes:

> So what would a dynamic linker have to do differently using "-mabicalls
> -fpic -G 0" versus "-membedded-pic"? I assume that there would be some
> processing of relocation tables. Is this documented somewhere?

The -mabicalls case works with ELF.  See the MIPS ELF Processor
Supplement:
    http://refspecs.freestandards.org/elf/mipsabi.pdf

The -membedded-pic case works with a very simpleminded format I
designed a long time ago.

Ian

Re: position independent code on MIPS

[Ian Lance Taylor]

"Paul Kohout" <pkohout@evitechnology.com> writes:

> How do I generate position independent code using a gcc v4.0.2
> cross-compiler targeted for the mips-elf platform?
> 
> In the past, I have used the -membedded-pic option with gcc v3.3.1, but
> this seems to have been deprecated in v4.0.2. I tried using the -fpic
> option, but it does not seem to create any dynamic relocation table
> entries for the .text section, just for data sections. Also, I've tried
> using the -mabicalls option, but I can't get it to work either.

It normally works to use -mabicalls -fpic -G 0.

But note that this is not the same as -membedded-pic.

Ian

position independent code on MIPS

[Paul Kohout]

How do I generate position independent code using a gcc v4.0.2
cross-compiler targeted for the mips-elf platform?

In the past, I have used the -membedded-pic option with gcc v3.3.1, but
this seems to have been deprecated in v4.0.2. I tried using the -fpic
option, but it does not seem to create any dynamic relocation table
entries for the .text section, just for data sections. Also, I've tried
using the -mabicalls option, but I can't get it to work either.

Any help would be greatly appreciated.

Thanks,
Paul