| 1 | #include <sys/mman.h> |
| 2 | #include <unistd.h> |
| 3 | #include <signal.h> |
| 4 | #include <stdlib.h> |
| 5 | #include <stdio.h> |
| 6 | #include <assert.h> |
| 7 | |
| 8 | static void *expected; |
| 9 | |
| 10 | void sigsegv(int sig, siginfo_t *info, void *vuc) |
| 11 | { |
| 12 | ucontext_t *uc = vuc; |
| 13 | |
| 14 | assert(info->si_addr == expected); |
| 15 | uc->uc_mcontext.pc += 4; |
| 16 | } |
| 17 | |
| 18 | int main() |
| 19 | { |
| 20 | struct sigaction sa = { |
| 21 | .sa_sigaction = sigsegv, |
| 22 | .sa_flags = SA_SIGINFO |
| 23 | }; |
| 24 | |
| 25 | void *page; |
| 26 | long ofs; |
| 27 | |
| 28 | if (sigaction(SIGSEGV, &sa, NULL) < 0) { |
| 29 | perror("sigaction"); |
| 30 | return EXIT_FAILURE; |
| 31 | } |
| 32 | |
| 33 | page = mmap(0, getpagesize(), PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0); |
| 34 | if (page == MAP_FAILED) { |
| 35 | perror("mmap"); |
| 36 | return EXIT_FAILURE; |
| 37 | } |
| 38 | |
| 39 | ofs = 0x124; |
| 40 | expected = page + ofs; |
| 41 | |
| 42 | asm("ptrue p0.d, vl1\n\t" |
| 43 | "dup z0.d, %0\n\t" |
| 44 | "ldnt1h {z1.d}, p0/z, [z0.d, %1]\n\t" |
| 45 | "dup z1.d, %1\n\t" |
| 46 | "ldnt1h {z0.d}, p0/z, [z1.d, %0]" |
| 47 | : : "r"(page), "r"(ofs) : "v0", "v1"); |
| 48 | |
| 49 | return EXIT_SUCCESS; |
| 50 | } |