| 1 | /* |
| 2 | * Test that a faulting STORE CLOCK FAST does not clobber the condition code. |
| 3 | * |
| 4 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 5 | */ |
| 6 | #include <assert.h> |
| 7 | #include <signal.h> |
| 8 | #include <stdlib.h> |
| 9 | #include <unistd.h> |
| 10 | |
| 11 | static void handle_sigsegv(int sig, siginfo_t *info, void *ucontext) |
| 12 | { |
| 13 | mcontext_t *mcontext = &((ucontext_t *)ucontext)->uc_mcontext; |
| 14 | |
| 15 | /* The condition code must be the one set by SLGR, not garbage. */ |
| 16 | _exit(((mcontext->psw.mask >> 44) & 3) == 3 ? EXIT_SUCCESS : EXIT_FAILURE); |
| 17 | } |
| 18 | |
| 19 | int main(void) |
| 20 | { |
| 21 | struct sigaction act = { |
| 22 | .sa_sigaction = handle_sigsegv, |
| 23 | .sa_flags = SA_SIGINFO, |
| 24 | }; |
| 25 | int err; |
| 26 | |
| 27 | err = sigaction(SIGSEGV, &act, NULL); |
| 28 | assert(err == 0); |
| 29 | |
| 30 | asm volatile( |
| 31 | "lghi %%r1,100\n" |
| 32 | "lghi %%r2,0\n" |
| 33 | "clgr %%r1,%%r2\n" /* CC_OP_LTUGTU_64 */ |
| 34 | /* cc_src=100 is not valid for CC_OP_SUBU */ |
| 35 | "ipm %%r0\n" /* force cc_src to env */ |
| 36 | "lghi %%r3,5\n" |
| 37 | "lghi %%r4,3\n" |
| 38 | "slgr %%r3,%%r4\n" /* CC_OP_SUBU, cc=3 */ |
| 39 | "lghi %%r5,0\n" |
| 40 | "stckf 0(%%r5)\n" /* faults; cc must stay 3 */ |
| 41 | : : : "r0", "r1", "r2", "r3", "r4", "r5", "cc", "memory"); |
| 42 | |
| 43 | return EXIT_FAILURE; |
| 44 | } |