On Wed, 18 May 2016, James Hogan wrote:
> The versions of the __write_{32,64}bit_gc0_register() macros for when
> there is no virt support in the assembler use the "J" inline asm
> constraint to allow integer zero, but this needs to be accompanied by
> the "z" formatting string so that it turns into $0. Fix both macros to
> do this.
NB `z' here is an "operand code" in GCC-speak. There's a list of the
MIPS-specific ones in gcc/config/mips/mips.c above `mips_print_operand'.
There are a few generic operand codes as well, most notably `a' to print
an address, matching the `p' constraint. I think it would be good to have
this all documented in the GCC manual sometime.
> Fixes: bad50d79255a ("MIPS: Fix VZ probe gas errors with binutils <2.24")
> Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
> Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
> Cc: linux-mips@xxxxxxxxxxxxxx
> ---
Reviewed-by: Maciej W. Rozycki <macro@xxxxxxxxxx>
Maciej
