On Thu, Oct 27, 2022 at 5:10 PM Chris Johns <chr...@rtems.org> wrote:
> On 28/10/2022 9:05 am, Kinsey Moore wrote: > > RTEMS may be booted from a dirty environment. Ensure that FPU trap > > settings are consistent. > > --- > > bsps/aarch64/shared/start/start.S | 10 ++++++++++ > > 1 file changed, 10 insertions(+) > > > > diff --git a/bsps/aarch64/shared/start/start.S > b/bsps/aarch64/shared/start/start.S > > index 8bd4f86f4e..de0fdf4c80 100644 > > --- a/bsps/aarch64/shared/start/start.S > > +++ b/bsps/aarch64/shared/start/start.S > > @@ -307,6 +307,16 @@ _el1_start: > > > > /* FPU does not need to be enabled on AArch64 */ > > > > + /* Ensure FPU traps are disabled by default */ > > + mrs x0, FPCR > > + bic x0, x0, #(1 << 8) > > + bic x0, x0, #(1 << 9) > > + bic x0, x0, #(1 << 10) > > + bic x0, x0, #(1 << 11) > > + bic x0, x0, #(1 << 12) > > + bic x0, x0, #(1 << 15) > > Does `bic x0, x0, #((1 << 8) | (1 << 9) | (1 << 10) | ...)` work? > The assembler complains about the operand being out of range. I can split it into 8-12 in one and 15 by itself and everything seems to work. Kinsey
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