51 lines
1009 B
C
51 lines
1009 B
C
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#include <sys/mman.h>
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#include <unistd.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <assert.h>
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static void *expected;
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void sigsegv(int sig, siginfo_t *info, void *vuc)
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{
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ucontext_t *uc = vuc;
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assert(info->si_addr == expected);
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uc->uc_mcontext.pc += 4;
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}
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int main()
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{
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struct sigaction sa = {
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.sa_sigaction = sigsegv,
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.sa_flags = SA_SIGINFO
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};
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void *page;
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long ofs;
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if (sigaction(SIGSEGV, &sa, NULL) < 0) {
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perror("sigaction");
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return EXIT_FAILURE;
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}
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page = mmap(0, getpagesize(), PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0);
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if (page == MAP_FAILED) {
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perror("mmap");
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return EXIT_FAILURE;
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}
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ofs = 0x124;
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expected = page + ofs;
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asm("ptrue p0.d, vl1\n\t"
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"dup z0.d, %0\n\t"
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"ldnt1h {z1.d}, p0/z, [z0.d, %1]\n\t"
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"dup z1.d, %1\n\t"
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"ldnt1h {z0.d}, p0/z, [z1.d, %0]"
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: : "r"(page), "r"(ofs) : "v0", "v1");
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return EXIT_SUCCESS;
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}
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