| 1 | /* |
| 2 | * Test that PERFORM RANDOM NUMBER OPERATION TRNG is interruptible. |
| 3 | * |
| 4 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 5 | */ |
| 6 | #include <assert.h> |
| 7 | #include <signal.h> |
| 8 | #include <stdio.h> |
| 9 | #include <stdlib.h> |
| 10 | #include <string.h> |
| 11 | #include <sys/time.h> |
| 12 | #include <asm/ucontext.h> |
| 13 | |
| 14 | static unsigned char buf1[16 * 1024 * 1024]; |
| 15 | static unsigned char buf2[16 * 1024 * 1024]; |
| 16 | |
| 17 | static volatile sig_atomic_t interrupted; |
| 18 | |
| 19 | static void sigprof_handler(int sig, siginfo_t *info, void *ucontext) |
| 20 | { |
| 21 | struct ucontext *uc = ucontext; |
| 22 | unsigned long addr = uc->uc_mcontext.regs.psw.addr; |
| 23 | |
| 24 | if (*(unsigned short *)(addr - 4) == 0xb93c) { |
| 25 | interrupted++; |
| 26 | } |
| 27 | } |
| 28 | |
| 29 | static void prno_trng(void *b1, unsigned long l1, void *b2, unsigned long l2) |
| 30 | { |
| 31 | register unsigned long r0 asm("r0") = 114; /* TRNG */ |
| 32 | register unsigned long r2 asm("r2") = (unsigned long)b1; |
| 33 | register unsigned long r3 asm("r3") = l1; |
| 34 | register unsigned long r4 asm("r4") = (unsigned long)b2; |
| 35 | register unsigned long r5 asm("r5") = l2; |
| 36 | |
| 37 | asm volatile("0: ppno %[r2],%[r4]\n" /* prno alias for old toolchains */ |
| 38 | " jo 0b" |
| 39 | : [r2] "+r" (r2), [r3] "+r" (r3) |
| 40 | , [r4] "+r" (r4), [r5] "+r" (r5) |
| 41 | : "r" (r0) |
| 42 | : "cc", "memory"); |
| 43 | } |
| 44 | |
| 45 | int main(void) |
| 46 | { |
| 47 | struct itimerval it = { |
| 48 | .it_interval = { .tv_usec = 10000 }, /* 0.01s */ |
| 49 | .it_value = { .tv_usec = 10000 }, |
| 50 | }; |
| 51 | struct sigaction act = { |
| 52 | .sa_sigaction = sigprof_handler, |
| 53 | .sa_flags = SA_SIGINFO, |
| 54 | }; |
| 55 | int err; |
| 56 | |
| 57 | err = sigaction(SIGPROF, &act, NULL); |
| 58 | assert(err == 0); |
| 59 | err = setitimer(ITIMER_PROF, &it, NULL); |
| 60 | assert(err == 0); |
| 61 | |
| 62 | prno_trng(buf1, sizeof(buf1), buf2, sizeof(buf2)); |
| 63 | printf("interrupted %d times\n", interrupted); |
| 64 | assert(interrupted >= 3); |
| 65 | |
| 66 | return EXIT_SUCCESS; |
| 67 | } |