projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 3200ca80 AL |
2 | /* |
| 3 | * ldt_gdt.c - Test cases for LDT and GDT access | |
| 4 | * Copyright (c) 2011-2015 Andrew Lutomirski | |
| 5 | */ | |
| 6 | ||
| 7 | #define _GNU_SOURCE | |
| 8 | ||
| 9 | #include <stdio.h> | |
| 10 | #include <sys/time.h> | |
| 11 | #include <time.h> | |
| 12 | #include <stdlib.h> | |
| 13 | #include <unistd.h> | |
| 14 | #include <sys/syscall.h> | |
| 15 | #include <dlfcn.h> | |
| 16 | #include <string.h> | |
| 17 | #include <errno.h> | |
| 18 | #include <sched.h> | |
| 19 | #include <stdbool.h> | |
| 20 | ||
| 21 | #ifndef SYS_getcpu | |
| 22 | # ifdef __x86_64__ | |
| 23 | # define SYS_getcpu 309 | |
| 24 | # else | |
| 25 | # define SYS_getcpu 318 | |
| 26 | # endif | |
| 27 | #endif | |
| 28 | ||
| 29 | int nerrs = 0; | |
| 30 | ||
| 31 | #ifdef __x86_64__ | |
| 32 | # define VSYS(x) (x) | |
| 33 | #else | |
| 34 | # define VSYS(x) 0 | |
| 35 | #endif | |
| 36 | ||
| 37 | typedef long (*getcpu_t)(unsigned *, unsigned *, void *); | |
| 38 | ||
| 39 | const getcpu_t vgetcpu = (getcpu_t)VSYS(0xffffffffff600800); | |
| 40 | getcpu_t vdso_getcpu; | |
| 41 | ||
| 42 | void fill_function_pointers() | |
| 43 | { | |
| 44 | void *vdso = dlopen("linux-vdso.so.1", | |
| 45 | RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD); | |
| 46 | if (!vdso) | |
| 47 | vdso = dlopen("linux-gate.so.1", | |
| 48 | RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD); | |
| 49 | if (!vdso) { | |
| 50 | printf("[WARN]\tfailed to find vDSO\n"); | |
| 51 | return; | |
| 52 | } | |
| 53 | ||
| 54 | vdso_getcpu = (getcpu_t)dlsym(vdso, "__vdso_getcpu"); | |
| 55 | if (!vdso_getcpu) | |
| 56 | printf("Warning: failed to find getcpu in vDSO\n"); | |
| 57 | } | |
| 58 | ||
| 59 | static long sys_getcpu(unsigned * cpu, unsigned * node, | |
| 60 | void* cache) | |
| 61 | { | |
| 62 | return syscall(__NR_getcpu, cpu, node, cache); | |
| 63 | } | |
| 64 | ||
| 65 | static void test_getcpu(void) | |
| 66 | { | |
| 67 | printf("[RUN]\tTesting getcpu...\n"); | |
| 68 | ||
| 69 | for (int cpu = 0; ; cpu++) { | |
| 70 | cpu_set_t cpuset; | |
| 71 | CPU_ZERO(&cpuset); | |
| 72 | CPU_SET(cpu, &cpuset); | |
| 73 | if (sched_setaffinity(0, sizeof(cpuset), &cpuset) != 0) | |
| 74 | return; | |
| 75 | ||
| 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; | |
| 79 | unsigned node; | |
| 80 | ||
| 81 | ret_sys = sys_getcpu(&cpu_sys, &node_sys, 0); | |
| 82 | if (vdso_getcpu) | |
| 83 | ret_vdso = vdso_getcpu(&cpu_vdso, &node_vdso, 0); | |
| 84 | if (vgetcpu) | |
| 85 | ret_vsys = vgetcpu(&cpu_vsys, &node_vsys, 0); | |
| 86 | ||
| 87 | if (!ret_sys) | |
| 88 | node = node_sys; | |
| 89 | else if (!ret_vdso) | |
| 90 | node = node_vdso; | |
| 91 | else if (!ret_vsys) | |
| 92 | node = node_vsys; | |
| 93 | ||
| 94 | bool ok = true; | |
| 95 | if (!ret_sys && (cpu_sys != cpu || node_sys != node)) | |
| 96 | ok = false; | |
| 97 | if (!ret_vdso && (cpu_vdso != cpu || node_vdso != node)) | |
| 98 | ok = false; | |
| 99 | if (!ret_vsys && (cpu_vsys != cpu || node_vsys != node)) | |
| 100 | ok = false; | |
| 101 | ||
| 102 | printf("[%s]\tCPU %u:", ok ? "OK" : "FAIL", cpu); | |
| 103 | if (!ret_sys) | |
| 104 | printf(" syscall: cpu %u, node %u", cpu_sys, node_sys); | |
| 105 | if (!ret_vdso) | |
| 106 | printf(" vdso: cpu %u, node %u", cpu_vdso, node_vdso); | |
| 107 | if (!ret_vsys) | |
| 108 | printf(" vsyscall: cpu %u, node %u", cpu_vsys, | |
| 109 | node_vsys); | |
| 110 | printf("\n"); | |
| 111 | ||
| 112 | if (!ok) | |
| 113 | nerrs++; | |
| 114 | } | |
| 115 | } | |
| 116 | ||
| 117 | int main(int argc, char **argv) | |
| 118 | { | |
| 119 | fill_function_pointers(); | |
| 120 | ||
| 121 | test_getcpu(); | |
| 122 | ||
| 123 | return nerrs ? 1 : 0; | |
| 124 | } |