From: Ilya Leoshkevich <[email protected]> Add a small test to prevent regressions.
Signed-off-by: Ilya Leoshkevich <[email protected]> Reviewed-by: Eric Farman <[email protected]> Link: https://lore.kernel.org/qemu-devel/[email protected] Signed-off-by: Eric Farman <[email protected]> --- tests/tcg/s390x/Makefile.target | 1 + tests/tcg/s390x/stckf.c | 44 +++++++++++++++++++++++++++++++++ 2 files changed, 45 insertions(+) create mode 100644 tests/tcg/s390x/stckf.c diff --git a/tests/tcg/s390x/Makefile.target b/tests/tcg/s390x/Makefile.target index 48cba4cdfa..97c0f02190 100644 --- a/tests/tcg/s390x/Makefile.target +++ b/tests/tcg/s390x/Makefile.target @@ -50,6 +50,7 @@ TESTS+=cvb TESTS+=ts TESTS+=ex-smc TESTS+=divide-to-integer +TESTS+=stckf cdsg: CFLAGS+=-pthread cdsg: LDFLAGS+=-pthread diff --git a/tests/tcg/s390x/stckf.c b/tests/tcg/s390x/stckf.c new file mode 100644 index 0000000000..51c8c9df9f --- /dev/null +++ b/tests/tcg/s390x/stckf.c @@ -0,0 +1,44 @@ +/* + * Test that a faulting STORE CLOCK FAST does not clobber the condition code. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ +#include <assert.h> +#include <signal.h> +#include <stdlib.h> +#include <unistd.h> + +static void handle_sigsegv(int sig, siginfo_t *info, void *ucontext) +{ + mcontext_t *mcontext = &((ucontext_t *)ucontext)->uc_mcontext; + + /* The condition code must be the one set by SLGR, not garbage. */ + _exit(((mcontext->psw.mask >> 44) & 3) == 3 ? EXIT_SUCCESS : EXIT_FAILURE); +} + +int main(void) +{ + struct sigaction act = { + .sa_sigaction = handle_sigsegv, + .sa_flags = SA_SIGINFO, + }; + int err; + + err = sigaction(SIGSEGV, &act, NULL); + assert(err == 0); + + asm volatile( + "lghi %%r1,100\n" + "lghi %%r2,0\n" + "clgr %%r1,%%r2\n" /* CC_OP_LTUGTU_64 */ + /* cc_src=100 is not valid for CC_OP_SUBU */ + "ipm %%r0\n" /* force cc_src to env */ + "lghi %%r3,5\n" + "lghi %%r4,3\n" + "slgr %%r3,%%r4\n" /* CC_OP_SUBU, cc=3 */ + "lghi %%r5,0\n" + "stckf 0(%%r5)\n" /* faults; cc must stay 3 */ + : : : "r0", "r1", "r2", "r3", "r4", "r5", "cc", "memory"); + + return EXIT_FAILURE; +} -- 2.55.0
