On Tue, 18 Mar 2025 at 12:47, Jerome Forissier
<jerome.foriss...@linaro.org> wrote:
>
> Implement initjmp() for Arm.
>
> Signed-off-by: Jerome Forissier <jerome.foriss...@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.apalodi...@linaro.org>
