Re: arm-elf-as truncates branch offsets w/o warning

[Scott Bambrough <scottb at netwinder dot org>]

Hi Grant,

Would you have a testcase for this as well?

Scott

Grant Edwards wrote:
> 
> > I just noticed that a recent snapshot (000309) of the ARM
> > assembler truncates branch offsets without warning.  I haven't
> > had a chance yet to take look at the ARM assembler source.
> 
> There are two different (but related) problems:
> 
>   1) Legal, non-relocatible branch destinations >= 0x0400,00000
>      are not handled correctly and bad code is generated with
>      no error or warning messages.
> 
>   2) Illegal branches to non-relocatible branch destinations
>      with offsets >= +/- 0x0200,00000 aren't detected and bad
>      code is generated (also silently).
> 
> So far I've had a look at #1.  I can't see a way to fix it
> easily, but I've attached a patch to gas/config/tc-arm.c that
> will generate an error when a non-relocatible branch destination
> is too large for gas to deal with.
> 
> I'll work on #2 next.
> 
> --
> Grant Edwards
> grante@visi.com
> 
>   --------------------------------------------------------------------------------
> 
>    gas-tc-arm.patchName: gas-tc-arm.patch
>                    Type: Plain Text (text/plain)

-- 
Scott Bambrough - Software Engineer
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