none/tests/x86/faultstatus.c

   1 /*
   2    Check that a fault signal handler gets the expected info
   3  */
   4 #include <signal.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <fcntl.h>
   8 #include <setjmp.h>
   9 #include <unistd.h>
  10 #include "tests/asm.h"
  11 #include "tests/sys_mman.h"
  12
  13 struct test {
  14         void (*test)(void);
  15         int sig;
  16         int code;
  17         volatile void *addr;
  18 };
  19
  20 static const struct test *cur_test;
  21
  22
  23
  24 static jmp_buf escape;
  25
  26 #define BADADDR ((int *)0x1234)
  27
  28 #define FILESIZE        (16*1024)
  29 #define MAPSIZE         (2*FILESIZE)
  30
  31 static char volatile *volatile mapping;
  32
  33 static int testsig(int sig, int want)
  34 {
  35         if (sig != want) {
  36                 fprintf(stderr, "  FAIL: expected signal %d, not %d\n", want, sig);
  37                 return 0;
  38         }
  39         return 1;
  40 }
  41
  42 static int testcode(int code, int want)
  43 {
  44         if (code != want) {
  45                 fprintf(stderr, "  FAIL: expected si_code==%d, not %d\n", want, code);
  46                 return 0;
  47         }
  48         return 1;
  49 }
  50
  51 static int testaddr(void *addr, volatile void *want)
  52 {
  53         if (addr != want) {
  54                 fprintf(stderr, "  FAIL: expected si_addr==%p, not %p\n", want, addr);
  55                 return 0;
  56         }
  57         return 1;
  58
  59 }
  60
  61 static void handler(int sig, siginfo_t *si, void *uc)
  62 {
  63         int ok = 1;
  64
  65         ok = ok && testsig(sig, cur_test->sig);
  66         ok = ok && testcode(si->si_code, cur_test->code);
  67         if (cur_test->addr)
  68                 ok = ok && testaddr(si->si_addr, cur_test->addr);
  69
  70         if (ok)
  71                 fprintf(stderr, "  PASS\n");
  72
  73         siglongjmp(escape, ok + 1);
  74 }
  75
  76
  77 extern char test1_ill;
  78 static void test1()
  79 {
  80         asm volatile(VG_SYM(test1_ill) ": ud2");
  81 }
  82
  83 static void test2()
  84 {
  85         asm volatile ("int3");
  86 }
  87
  88 static void test3()
  89 {
  90         asm volatile ("int $0x10");
  91 }
  92
  93 static void test4()
  94 {
  95         volatile int a;
  96         asm volatile ("add $1, %0;"/* set OF */
  97                       "into"
  98                       : "=a" (a) : "0" (0x7fffffff) : "cc");
  99 }
 100
 101 static void test5()
 102 {
 103         static int limit[2] = { 0, 10 };
 104
 105         asm volatile ("bound %0, %1" : : "r" (11), "m" (limit[0]));
 106 }
 107
 108 int main()
 109 {
 110         int fd, i;
 111         static const int sigs[] = { SIGSEGV, SIGILL, SIGBUS, SIGFPE, SIGTRAP };
 112         struct sigaction sa;
 113
 114         sa.sa_sigaction = handler;
 115         sa.sa_flags = SA_SIGINFO;
 116         sigfillset(&sa.sa_mask);
 117
 118         for(i = 0; i < sizeof(sigs)/sizeof(*sigs); i++)
 119                 sigaction(sigs[i], &sa, NULL);
 120
 121         fd = open("faultstatus.tmp", O_CREAT|O_TRUNC|O_EXCL, 0600);
 122         if (fd == -1) {
 123                 perror("tmpfile");
 124                 exit(1);
 125         }
 126         unlink("faultstatus.tmp");
 127         ftruncate(fd, FILESIZE);
 128
 129         mapping = mmap(0, MAPSIZE, PROT_READ, MAP_PRIVATE, fd, 0);
 130         close(fd);
 131
 132         {
 133                 const struct test tests[] = {
 134 #define T(n, sig, code, addr) { test##n, sig, code, addr }
 135                         T(1, SIGILL,    ILL_ILLOPN,     &test1_ill),
 136
 137                         T(2, SIGTRAP,   128,            0), /* TRAP_BRKPT? */
 138                         T(3, SIGSEGV,   128,            0),
 139                         T(4, SIGSEGV,   128,            0),
 140
 141                         /* This is an expected failure - Valgrind
 142                            doesn't implement the BOUND instruction,
 143                            and so issues a SIGILL instead. */
 144                         T(5, SIGSEGV,   128,            0),
 145 #undef T
 146                 };
 147
 148                 for(i = 0; i < sizeof(tests)/sizeof(*tests); i++) {
 149                         cur_test = &tests[i];
 150
 151                         if (sigsetjmp(escape, 1) == 0) {
 152                                 fprintf(stderr, "Test %d: ", i+1);
 153                                 tests[i].test();
 154                                 fprintf(stderr, "  FAIL: no fault, or handler returned\n");
 155                         }
 156                 }
 157         }
 158
 159         return 0;
 160 }
 161