ARM issue with old binutils

Warner Losh imp at bsdimp.com
Wed Jun 22 15:42:46 UTC 2011


I'd be inclined to include a small patch to FreeBSD's binutils to implement this.  You might be able to snag it from a newer version of binutils if you can track down the author of that code and ask if you can include it in a GPLv2 version of binutils.

Warner

On Jun 22, 2011, at 7:09 AM, Damjan Marion wrote:

> 
> Hi,
> 
> On my ongoing effort to support clang cross-compiling of world for ARM architecture I hit one weird issue:
> 
> Problem is that old ARM Architecture Reference Manual (ARMv5) specifies mnemonics "mov r0, r0, rrx" 
> while new ARM ARM defines same instruction as "rrx r0,r0". 
> 
> Both have same opcode: 0xe1a00060.
> 
> Problem is that clang currently uses GAS to assemble files and GAS version we have (2.17.50)  doesn't have a clue about new mnemonics "rrx r0,r0".
> 
> I see 3 options to fix this:
> 
> 1. Ask clang folks to patch llvm to use old mnemonics  ("mov r0, r0, rrx" instead of "rrx r0,r0")
> 2. Maintain same patch for freebsd only
> 3. patch binutils to support this new mnemonics
> 
> Any thoughts how to proceed?
> 
> Thanks,
> 
> Damjan
> 
> 
> 
> 
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