Re: [Qemu-devel] [PATCH 20/20] target/arm: Implement BXNS, and banked stack pointers

[Richard Henderson]

On 08/22/2017 08:08 AM, Peter Maydell wrote:
> Implement the BXNS v8M instruction, which is like BX but will do a
> jump-and-switch-to-NonSecure if the branch target address has bit 0
> clear.
> 
> This is the first piece of code which implements "switch to the
> other security state", so the commit also includes the code to
> switch the stack pointers around, which is the only complicated
> part of switching security state.
> 
> BLXNS is more complicated than just "BXNS but set the link register",
> so we leave it for a separate commit.
> 
> Signed-off-by: Peter Maydell <address@hidden>
> ---
>  target/arm/cpu.h       | 13 +++++++++
>  target/arm/helper.h    |  2 ++
>  target/arm/translate.h |  1 +
>  target/arm/helper.c    | 79 
> ++++++++++++++++++++++++++++++++++++++++++++++++++
>  target/arm/machine.c   |  2 ++
>  target/arm/translate.c | 42 ++++++++++++++++++++++++++-
>  6 files changed, 138 insertions(+), 1 deletion(-)

Reviewed-by: Richard Henderson <address@hidden>


r~