Re: GCC-3.3.6 and MIPS instruction "EHB"

[David Daney <ddaney at avtrex dot com>]

Mohamed Bamakhrama wrote:
> Hi *,
> I am using GCC-3.3.6 for MIPS and tried to use the instruction "EHB"
> (Execution Hazard Barrier). However, I get the following error:
>
> Assembler messages:
> Error: opcode not supported on this processor: mips32 (mips32) 'ehb'
>
> Does anyone know if this instruction is supported in that version of
> GCC or any later versions?
> Moreover, is there any equivalent instructions that can be used instead?

ehb is only available on mips32r2.  If you were using gcc 3.4.x or later 
you could pass -mips32r2 to GCC to enable the mips32r2 ISA.  You may be 
able to do: -Wa,-mips32r2 to pass the option directly to gas.

Alternatively you could try something like this in your code:

	.set	push
	.set	mips32r2
	ehb
	.set	pop

The processor reference manuals are available on mips.com.

David Daney.