[PATCH v4 02/14] arm: add initjmp()

[Ilias Apalodimas]

On Tue, 18 Mar 2025 at 12:47, Jerome Forissier
<jerome.forissier at linaro.org> wrote:
>
> Implement initjmp() for Arm.
>
> Signed-off-by: Jerome Forissier <jerome.forissier at linaro.org>
> ---
>  arch/Kconfig                  |  1 +
>  arch/arm/lib/setjmp.S         | 12 ++++++++++++
>  arch/arm/lib/setjmp_aarch64.S | 10 ++++++++++
>  3 files changed, 23 insertions(+)
>
> diff --git a/arch/Kconfig b/arch/Kconfig
> index 14111ca14fb..7a3141e92b3 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -95,6 +95,7 @@ config ARC
>  config ARM
>         bool "ARM architecture"
>         select HAVE_SETJMP
> +       select HAVE_INITJMP
>         select ARCH_SUPPORTS_LTO
>         select CREATE_ARCH_SYMLINK
>         select HAVE_PRIVATE_LIBGCC if !ARM64
> diff --git a/arch/arm/lib/setjmp.S b/arch/arm/lib/setjmp.S
> index 2f041aeef01..81bef578719 100644
> --- a/arch/arm/lib/setjmp.S
> +++ b/arch/arm/lib/setjmp.S
> @@ -34,3 +34,15 @@ ENTRY(longjmp)
>         ret  lr
>  ENDPROC(longjmp)
>  .popsection
> +
> +.pushsection .text.initjmp, "ax"
> +ENTRY(initjmp)
> +       stm  a1, {v1-v8}
> +       /* a2: entry point address, a3: stack base, a4: stack size */
> +       add  a3, a3, a4
> +       str  a3, [a1, #32]  /* where setjmp would save sp */
> +       str  a2, [a1, #36]  /* where setjmp would save lr */
> +       mov  a1, #0
> +       ret  lr
> +ENDPROC(initjmp)
> +.popsection
> diff --git a/arch/arm/lib/setjmp_aarch64.S b/arch/arm/lib/setjmp_aarch64.S
> index 1b8d000eb48..01193ccc426 100644
> --- a/arch/arm/lib/setjmp_aarch64.S
> +++ b/arch/arm/lib/setjmp_aarch64.S
> @@ -39,3 +39,13 @@ ENTRY(longjmp)
>         ret
>  ENDPROC(longjmp)
>  .popsection
> +
> +.pushsection .text.initjmp, "ax"
> +ENTRY(initjmp)
> +       /* x1: entry point address, x2: stack base, x3: stack size */
> +       add x2, x2, x3
> +       stp x1, x2, [x0,#88]
> +       mov  x0, #0
> +       ret
> +ENDPROC(initjmp)
> +.popsection
> --
> 2.43.0
>

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