Re: [PATCH 09/12] tests/tcg/s390x: Test LARL with a large offset

[David Hildenbrand <david@redhat.com>]

On 03.07.23 17:50, Ilya Leoshkevich wrote:
> Add a small test to prevent regressions.
> 
> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
> ---
>   tests/tcg/s390x/Makefile.target |  1 +
>   tests/tcg/s390x/larl.c          | 17 +++++++++++++++++
>   2 files changed, 18 insertions(+)
>   create mode 100644 tests/tcg/s390x/larl.c
> 
> diff --git a/tests/tcg/s390x/Makefile.target b/tests/tcg/s390x/Makefile.target
> index 2ef22c88d95..dbf64c991e9 100644
> --- a/tests/tcg/s390x/Makefile.target
> +++ b/tests/tcg/s390x/Makefile.target
> @@ -37,6 +37,7 @@ TESTS+=ex-relative-long
>   TESTS+=ex-branch
>   TESTS+=mxdb
>   TESTS+=epsw
> +TESTS+=larl
>   
>   cdsg: CFLAGS+=-pthread
>   cdsg: LDFLAGS+=-pthread
> diff --git a/tests/tcg/s390x/larl.c b/tests/tcg/s390x/larl.c
> new file mode 100644
> index 00000000000..b9ced99a023
> --- /dev/null
> +++ b/tests/tcg/s390x/larl.c
> @@ -0,0 +1,17 @@
> +/*
> + * Test the LARL instruction.
> + *
> + * SPDX-License-Identifier: GPL-2.0-or-later
> + */
> +#include <stdlib.h>
> +
> +int main(void)
> +{
> +    long algfi = (long)main;
> +    long larl;
> +
> +    asm("algfi %[r],0xd0000000" : [r] "+r" (algfi) : : "cc");
> +    asm("larl %[r],main+0xd0000000" : [r] "=r" (larl));

Not sure if worth combining both statements.

> +
> +    return algfi == larl ? EXIT_SUCCESS : EXIT_FAILURE;
> +}

Acked-by: David Hildenbrand <david@redhat.com>

-- 
Cheers,

David / dhildenb