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Re: [PATCH] Enable use of ARMv5t BLX for Thumb-mode calls via PLT
- From: Paul Brook <paul at codesourcery dot com>
- To: binutils at sources dot redhat dot com
- Cc: Julian Brown <julian at codesourcery dot com>
- Date: Mon, 11 Apr 2005 20:39:17 +0100
- Subject: Re: [PATCH] Enable use of ARMv5t BLX for Thumb-mode calls via PLT
- Organization: CodeSourcery
- References: <425AC810.5040408@codesourcery.com>
On Monday 11 April 2005 19:55, Julian Brown wrote:
> Hi,
>
> This patch allows the ARMv5t Thumb BLX instruction to be used
> (optionally) to call PLT entries, which should provide a slight speed
> boost. A previous, SymbianOS-specific version of the patch was posted here:
>
> http://sourceware.org/ml/binutils/2005-03/msg00433.html
>
> With this patch, the option "--use-thumb-blx" can be passed to the
> linker to enable the use of the BLX instruction when the target supports
> it. The format of the PLT itself isn't changed by this patch: there is
> still a Thumb stub before each ARM PLT entry, but it is now unused. The
> ARM mode entry is called directly instead.
I'd call the option to --use-blx, than way we can use it for other [not yet
written] patches to eliminate interworking stubs.
I can't approve the patch, but it looks ok to me.
Paul