Re: [PATCH] tools/nolibc: add 64-bit parisc support

[David Laight <david.laight.linux@gmail.com>]

On Thu, 20 Aug 2026 11:32:50 +0200
Thomas Weißschuh <linux@weissschuh.net> wrote:

> Extend the existing parisc support to also handle 64-bit mode.
> 
> Some peculiarities:
> * The nonstandard ftruncate64 system call requires a workaround.
> * The linker defaults to main() as entry point, which needs to be
>   switched to _start() explicitly.
> * The linker defaults to dynamic linking, which needs to be disabled
>   explicitly.
> * With the default -Os, gcc does not use 64-bit multiplication
>   instructions, requiring libgcc. Use -O2 instead.
> * There is no qemu-user available.
> * CONFIG_COMPAT needs to be disabled to avoid build errors due to a
>   missing 32-bit vDSO compiler.
...
> diff --git a/tools/testing/selftests/nolibc/run-tests.sh b/tools/testing/selftests/nolibc/run-tests.sh
> index 3da806e2b302..a50a47d9df2c 100755
> --- a/tools/testing/selftests/nolibc/run-tests.sh
> +++ b/tools/testing/selftests/nolibc/run-tests.sh
> @@ -29,7 +29,7 @@ all_archs=(
>  	sparc32 sparc64
>  	m68k
>  	sh4
> -	parisc32
> +	parisc32 parisc64
>  	alpha
>  	hexagon
>  )
> @@ -122,6 +122,7 @@ crosstool_arch() {
>  	sparc*) echo sparc64;;
>  	x32*) echo x86_64;;
>  	parisc32) echo hppa;;
> +	parisc64) echo hppa64;;
>  	*) echo "$1";;
>  	esac
>  }
> @@ -206,11 +207,11 @@ test_arch() {
>  			exit 1
>  	esac
>  	printf '%-15s' "$arch:"
> -	if [ "$arch" = "m68k" -o "$arch" = "sh4" -o "$arch" = "openrisc" -o "$arch" = "parisc32" -o "$arch" = "alpha" ] && [ "$llvm" = "1" ]; then
> +	if [ "$arch" = "m68k" -o "$arch" = "sh4" -o "$arch" = "openrisc" -o "$arch" = "parisc*" -o "$arch" = "alpha" ] && [ "$llvm" = "1" ]; then

Would it be better to put the llvm condition first?

>  		echo "Unsupported configuration"

"Unsupported compiler" ?

>  		return
>  	fi
> -	if [ "$arch" = "x32" ] && [ "$test_mode" = "user" ]; then
> +	if [ "$arch" = "x32" -o "$arch" = "parisc64" ] && [ "$test_mode" = "user" ]; then

Ditto.

David

>  		echo "Unsupported configuration"
>  		return
>  	fi
> 
> ---
> base-commit: 7f4233794df172ab1d286dc0fbd70da2cc837654
> change-id: 20260407-nolibc-parisc64-3ca0547c2af9
> 
> Best regards,
> --  
> Thomas Weißschuh <linux@weissschuh.net>
> 
>