Date: Wed, 22 Jun 2011 15:09:26 +0200 From: Damjan Marion <damjan.marion@gmail.com> To: toolchain@freebsd.org Subject: ARM issue with old binutils Message-ID: <0C35FE0F-3301-44C6-AC40-233F6C446EBC@gmail.com>
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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"=20
while new ARM ARM defines same instruction as "rrx r0,r0".=20
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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