On Mon, 27 Jun 2022 14:43:56 +0200
Janis Schoetterl-Glausch <scgl@xxxxxxxxxxxxx> wrote:
> According to the architecture, SET PREFIX must try to access the new
> prefix area and recognize an addressing exception if the area is not
> accessible.
> Test that the exception occurs when we try to set a prefix higher
> than the available memory.
>
> Signed-off-by: Janis Schoetterl-Glausch <scgl@xxxxxxxxxxxxx>
> ---
> s390x/intercept.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/s390x/intercept.c b/s390x/intercept.c
> index 86e57e11..0b90e588 100644
> --- a/s390x/intercept.c
> +++ b/s390x/intercept.c
> @@ -74,6 +74,20 @@ static void test_spx(void)
> expect_pgm_int();
> asm volatile(" spx 0(%0) " : : "r"(-8L));
> check_pgm_int_code(PGM_INT_CODE_ADDRESSING);
> +
> + new_prefix = get_ram_size() & 0x7fffe000;
> + if (get_ram_size() - new_prefix < 2 * PAGE_SIZE) {
> + expect_pgm_int();
> + asm volatile("spx %0 " : : "Q"(new_prefix));
> + check_pgm_int_code(PGM_INT_CODE_ADDRESSING);
> +
> + /*
> + * Cannot test inaccessibility of the second page the same way.
> + * If we try to use the last page as first half of the prefix
> + * area and our ram size is a multiple of 8k, after SPX aligns
> + * the address to 8k we have a completely accessible area.
> + */
> + }
please add something like:
else {
report_skip("Inaccessible prefix");
}
> }
>
> /* Test the STORE CPU ADDRESS instruction */
>
> base-commit: 110c69492b53f0070e1bbce986fb635e72a423b4
