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ARM Vs GCC assembler
Offline
Gerald Murphy
over 7 years ago
Note: This was originally posted on 25th January 2013 at http://forums.arm.com
Hi,
I have a question regarding the ARM and GCC assemblers i.e. ARMASM and GAS.
MOV.W R4,#0x87C0 is translated to F248_74C0 by ARMASM.
However, GAS throws up the error "invalid constant (87c0) after fixup" for the same instruction. Why does GAS give an error for this?
I realise the operand is 16-bit but I'm using the '.syntax unified'. I thought GAS supports .W and .N suffixes. Even without the .W suffix, GAS gives the same error whereas ARMASM quietly expands the 16-bit instruction to 32-bit.
I'm using 'GCC version 4.7.2 (Sourcety CodeBench Lite 2012.09-63).
Any insight as to why GAS is giving an error is appreciated. The workaround is to use two instructions. The following 2 instructions compile OK.
MOVW R4 ,#0xC0
MOVT R4 ,#0x87
Thanks and regards,
Ger
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Offline
Gerald Murphy
over 7 years ago
Note: This was originally posted on 4th February 2013 at
http://forums.arm.com
Thanks for the reply.
Yes, I missed the fact that T2 specifies a 12-bit immediate value.
I tried "MOV.W R4,0x87C" and I still get the 'invalid constant (0x87C) after fixup' error with GAS.
Regards,
Ger
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Offline
Gerald Murphy
over 7 years ago
Note: This was originally posted on 4th February 2013 at
http://forums.arm.com
Thanks for the reply.
Yes, I missed the fact that T2 specifies a 12-bit immediate value.
I tried "MOV.W R4,0x87C" and I still get the 'invalid constant (0x87C) after fixup' error with GAS.
Regards,
Ger
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