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Re: Handling R_ARM_JUMP24 with inter-working
- From: Richard Earnshaw <rearnsha at arm dot com>
- To: Ben Gamari <bgamari dot foss at gmail dot com>
- Cc: "binutils at sourceware dot org" <binutils at sourceware dot org>, "gcc at gcc dot gnu dot org" <gcc at gcc dot gnu dot org>
- Date: Fri, 14 Oct 2011 18:34:35 +0100
- Subject: Re: Handling R_ARM_JUMP24 with inter-working
- References: <87ty7bttlh.fsf@gmail.com>
On 14/10/11 17:40, Ben Gamari wrote:
> According to the ELF for ARM specification, this case requires the
> generation of veneer code to handle the instruction set switch. My
> question is where can one reliably place this veneer such that it is
> within the 2^11 window permitted by the relevant instructions. This is
> made difficult considering the fact that in the general case .text
> itself may be over 2^11 bytes long. It seems that the ELF for ARM
> specification gives a format for veneer symbol naming in appendix B, but
> compilers are not required to support this. How does one generally handle
> placing these relocations?
You might have to put such veneers *between* the components of the .text
section (I really wouldn't expect a single *input* .text to be this
large, and it's reasonable to just say "sorry, I can't do that" if
anybody tries).
R.