1 /* 2 * Test execution of DC CVAP instruction. 3 * 4 * Copyright (c) 2023 Zhuojia Shen <chaosdefinition@hotmail.com> 5 * SPDX-License-Identifier: GPL-2.0-or-later 6 */ 7 8 #include <asm/hwcap.h> 9 #include <sys/auxv.h> 10 11 #include <signal.h> 12 #include <stdbool.h> 13 #include <stdio.h> 14 #include <stdlib.h> 15 16 #ifndef HWCAP_DCPOP 17 #define HWCAP_DCPOP (1 << 16) 18 #endif 19 20 bool should_fail = false; 21 22 static void signal_handler(int sig, siginfo_t *si, void *data) 23 { 24 ucontext_t *uc = (ucontext_t *)data; 25 26 if (should_fail) { 27 uc->uc_mcontext.pc += 4; 28 } else { 29 exit(EXIT_FAILURE); 30 } 31 } 32 33 static int do_dc_cvap(void) 34 { 35 struct sigaction sa = { 36 .sa_flags = SA_SIGINFO, 37 .sa_sigaction = signal_handler, 38 }; 39 40 sigemptyset(&sa.sa_mask); 41 if (sigaction(SIGSEGV, &sa, NULL) < 0) { 42 perror("sigaction"); 43 return EXIT_FAILURE; 44 } 45 46 asm volatile("dc cvap, %0\n\t" :: "r"(&sa)); 47 48 should_fail = true; 49 asm volatile("dc cvap, %0\n\t" :: "r"(NULL)); 50 should_fail = false; 51 52 return EXIT_SUCCESS; 53 } 54 55 int main(void) 56 { 57 if (getauxval(AT_HWCAP) & HWCAP_DCPOP) { 58 return do_dc_cvap(); 59 } else { 60 printf("SKIP: no HWCAP_DCPOP on this system\n"); 61 return EXIT_SUCCESS; 62 } 63 } 64