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

["Thomas Weißschuh" <linux@weissschuh.net>]

On 2026-08-24 09:19:58+0100, David Laight wrote:
> 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?

Ack, I'll switch this in a preparatory patch.

> 
> >  		echo "Unsupported configuration"
> 
> "Unsupported compiler" ?

Not much difference IMO.

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

Ack, as above.


Thanks,
Thomas