[PATCH 02/11] riscv: update asm call site in `call_on_irq_stack` to setup correct label

[Heinrich Schuchardt]

On 25.07.25 01:36, Deepak Gupta wrote:
> Call sites written in asm performing indirect call, they need to setup
> label register (t2/x7) with correct label.
> 
> Currently first kernel was compiled with `-save-temps` option and
> normalized function signature string is captured and then placed at the
> asm callsite.
> 
> TODO: to write a macro wrapper with toolchain support.
> 
> Signed-off-by: Deepak Gupta <debug at rivosinc.com>
> ---
>   arch/riscv/kernel/entry.S | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
> index 2660faf52232..598e17e800ae 100644
> --- a/arch/riscv/kernel/entry.S
> +++ b/arch/riscv/kernel/entry.S
> @@ -389,6 +389,7 @@ SYM_FUNC_START(call_on_irq_stack)
>   	load_per_cpu t0, irq_stack_ptr, t1
>   	li	t1, IRQ_STACK_SIZE
>   	add	sp, t0, t1
> +	lui t2, %lpad_hash("FvP7pt_regsE")

In patch 1 you use lpad 0 due to missing tool support for signature hashing.

Wouldn't it be preferable to have a first patch series introducing 
landing pad support with lpad 0 and once tool support for signature 
hashing has landed create a second patch series using tags?

Such a first patch series would not have to be an RFC but might be 
merged soon.

Best regards

Heinrich

>   	jalr	a1
>   
>   	/* Switch back to the thread shadow call stack */
>