Re: [libopcodes] Switching manually between print_insn_arm and print_insn_thumb(16|32)

["Dr. David Alan Gilbert" <dave at treblig dot org>]

* Emmanuel Fleury (fleury@labri.fr) wrote:
> Hello,
> 
> I am writing a small disassembler for ARM based on libopcodes. For now,
> I managed to get the full ARM mode to be operational (32 bits
> instructions).
> 
> But, once I get the disassembler_ftype (I simplified the code):
> 
>   abfd->arch_info = bfd_scan_arch ("arm");
>   this->disassembler_fn = disassembler(abfd);
> 
> How can I switch to thumb mode on demand ?
> 
> I would like to get access to print_insn_thumb(16|32) when needed.
> 
> 
> I also have a second question which is somehow a bit similar. I would
> like to be able to decide what endianness is selected in the abdf
> structure. I tried to access directly to the field and set it:
> 
>   (abfd)->xvec->byteorder = BFD_ENDIAN_BIG;
> 
> But, the xvec created by new_bfd() seems to be read-only. Is there a way
> to work around and be able to modify endianness on-the-fly ?

I used the following to do it:

https://github.com/penguin42/pocketdisassembler/blob/master/jni/binutilsglue.c#L46

there's also an option you can pass to force thumb mode. I think it's 'force-thumb'

Dave

> 
> Regards
> -- 
> Emmanuel Fleury
> 
> Computer Science is no more about computers than astronomy is
> about telescopes.
>   -- Edsger Dijkstra
> 


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