1 // SPDX-License-Identifier: GPL-2.0
3 * ldt_gdt.c - Test cases for LDT and GDT access
4 * Copyright (c) 2011-2015 Andrew Lutomirski
14 #include <sys/syscall.h>
23 # define SYS_getcpu 309
25 # define SYS_getcpu 318
37 typedef long (*getcpu_t)(unsigned *, unsigned *, void *);
39 const getcpu_t vgetcpu = (getcpu_t)VSYS(0xffffffffff600800);
42 void fill_function_pointers()
44 void *vdso = dlopen("linux-vdso.so.1",
45 RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
47 vdso = dlopen("linux-gate.so.1",
48 RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
50 printf("[WARN]\tfailed to find vDSO\n");
54 vdso_getcpu = (getcpu_t)dlsym(vdso, "__vdso_getcpu");
56 printf("Warning: failed to find getcpu in vDSO\n");
59 static long sys_getcpu(unsigned * cpu, unsigned * node,
62 return syscall(__NR_getcpu, cpu, node, cache);
65 static void test_getcpu(void)
67 printf("[RUN]\tTesting getcpu...\n");
69 for (int cpu = 0; ; cpu++) {
72 CPU_SET(cpu, &cpuset);
73 if (sched_setaffinity(0, sizeof(cpuset), &cpuset) != 0)
76 unsigned cpu_sys, cpu_vdso, cpu_vsys,
77 node_sys, node_vdso, node_vsys;
78 long ret_sys, ret_vdso = 1, ret_vsys = 1;
81 ret_sys = sys_getcpu(&cpu_sys, &node_sys, 0);
83 ret_vdso = vdso_getcpu(&cpu_vdso, &node_vdso, 0);
85 ret_vsys = vgetcpu(&cpu_vsys, &node_vsys, 0);
95 if (!ret_sys && (cpu_sys != cpu || node_sys != node))
97 if (!ret_vdso && (cpu_vdso != cpu || node_vdso != node))
99 if (!ret_vsys && (cpu_vsys != cpu || node_vsys != node))
102 printf("[%s]\tCPU %u:", ok ? "OK" : "FAIL", cpu);
104 printf(" syscall: cpu %u, node %u", cpu_sys, node_sys);
106 printf(" vdso: cpu %u, node %u", cpu_vdso, node_vdso);
108 printf(" vsyscall: cpu %u, node %u", cpu_vsys,
117 int main(int argc, char **argv)
119 fill_function_pointers();
123 return nerrs ? 1 : 0;