[PATCH v2 01/14] arch: introduce symbol HAVE_INITJMP

[Ilias Apalodimas]

Hi Jerome,


On Tue, 25 Feb 2025 at 18:35, Jerome Forissier
<jerome.forissier at linaro.org> wrote:
>
> HAVE_INIJMP will be set by architectures that support initjmp(), a
> non-standard extension to setjmp()/longjmp() allowing to initialize a
> jump buffer with a function pointer and a stack pointer. This will be
> useful to later introduce threads. With this new function it becomes
> possible to longjmp() to a particular function pointer (rather than
> to a point previously reached during program execution as is the case
> with setjmp()), and with a custom stack. Both things are needed to
> spin off a new thread. Then the usual setjmp()/ longjmp() pair is
> enough to save and restore a context, i.e., switch thread.
>
> Signed-off-by: Jerome Forissier <jerome.forissier at linaro.org>
> ---
>  arch/Kconfig | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/arch/Kconfig b/arch/Kconfig
> index 35b19f9bfdc..8d5b54031b3 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -13,6 +13,12 @@ config HAVE_SETJMP
>         help
>          The architecture supports setjmp() and longjmp().
>
> +config HAVE_INITJMP
> +       bool
> +       help
> +        The architecture supports initjmp(), a non-standard companion to
> +        setjmp() and longjmp().
> +
>  config SUPPORT_BIG_ENDIAN
>         bool
>
> --
> 2.43.0
>\


Reviewed-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>