Re: [Qemu-arm] [Qemu-devel] [PATCH 19/20] target/arm: Implement secure function return

[Richard Henderson]

On 09/22/2017 11:00 AM, Peter Maydell wrote:
> Secure function return happens when a non-secure function has been
> called using BLXNS and so has a particular magic LR value (either
> 0xfefffffe or 0xfeffffff). The function return via BX behaves
> specially when the new PC value is this magic value, in the same
> way that exception returns are handled.
> 
> Adjust our BX excret guards so that they recognize the function
> return magic number as well, and perform the function-return
> unstacking in do_v7m_exception_exit().
> 
> Signed-off-by: Peter Maydell <address@hidden>
> ---
>  target/arm/internals.h |   7 +++
>  target/arm/helper.c    | 115 
> +++++++++++++++++++++++++++++++++++++++++++++----
>  target/arm/translate.c |  14 +++++-
>  3 files changed, 126 insertions(+), 10 deletions(-)

Reviewed-by: Richard Henderson <address@hidden>


r~