none/tests/amd64/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 "tests/sys_mman.h"
  10 #include <unistd.h>
  11
  12 struct test {
  13         void (*test)(void);
  14         int sig;
  15         int code;
  16         volatile void *addr;
  17 };
  18
  19 static const struct test *cur_test;
  20
  21 static sigjmp_buf escape;
  22
  23 #define BADADDR ((int *)0x1234)
  24
  25 #define FILESIZE        (16*1024)
  26 #define MAPSIZE         (2*FILESIZE)
  27
  28 static char volatile *volatile mapping;
  29
  30 static int testsig(int sig, int want)
  31 {
  32         if (sig != want) {
  33                 fprintf(stderr, "  FAIL: expected signal %d, not %d\n", want, sig);
  34                 return 0;
  35         }
  36         return 1;
  37 }
  38
  39 static int testcode(int code, int want)
  40 {
  41         if (code != want) {
  42                 fprintf(stderr, "  FAIL: expected si_code==%d, not %d\n", want, code);
  43                 return 0;
  44         }
  45         return 1;
  46 }
  47
  48 static int testaddr(void *addr, volatile void *want)
  49 {
  50         if (addr != want) {
  51                 fprintf(stderr, "  FAIL: expected si_addr==%p, not %p\n", want, addr);
  52                 return 0;
  53         }
  54         return 1;
  55
  56 }
  57
  58 static void handler(int sig, siginfo_t *si, void *uc)
  59 {
  60         int ok = 1;
  61
  62         ok = ok && testsig(sig, cur_test->sig);
  63         ok = ok && testcode(si->si_code, cur_test->code);
  64         if (cur_test->addr)
  65                 ok = ok && testaddr(si->si_addr, cur_test->addr);
  66
  67         if (ok)
  68                 fprintf(stderr, "  PASS\n");
  69
  70         siglongjmp(escape, ok + 1);
  71 }
  72
  73
  74 extern char test1_ill;
  75 static void test1()
  76 {
  77         asm volatile("test1_ill: ud2");
  78 }
  79
  80 static void test2()
  81 {
  82         asm volatile ("int3");
  83 }
  84
  85 static void test3()
  86 {
  87         asm volatile ("int $0x10");
  88 }
  89
  90 int main()
  91 {
  92         int fd, i;
  93         static const int sigs[] = { SIGSEGV, SIGILL, SIGBUS, SIGFPE, SIGTRAP };
  94         struct sigaction sa;
  95
  96         sa.sa_sigaction = handler;
  97         sa.sa_flags = SA_SIGINFO;
  98         sigfillset(&sa.sa_mask);
  99
 100         for(i = 0; i < sizeof(sigs)/sizeof(*sigs); i++)
 101                 sigaction(sigs[i], &sa, NULL);
 102
 103         fd = open("faultstatus.tmp", O_CREAT|O_TRUNC|O_EXCL, 0600);
 104         if (fd == -1) {
 105                 perror("tmpfile");
 106                 exit(1);
 107         }
 108         unlink("faultstatus.tmp");
 109         ftruncate(fd, FILESIZE);
 110
 111         mapping = mmap(0, MAPSIZE, PROT_READ, MAP_PRIVATE, fd, 0);
 112         close(fd);
 113
 114         {
 115                 const struct test tests[] = {
 116 #define T(n, sig, code, addr) { test##n, sig, code, addr }
 117                         T(1, SIGILL,    ILL_ILLOPN,     &test1_ill),
 118
 119                         T(2, SIGTRAP,   128,            0), /* TRAP_BRKPT? */
 120                         T(3, SIGSEGV,   128,            0),
 121 #undef T
 122                 };
 123
 124                 for(i = 0; i < sizeof(tests)/sizeof(*tests); i++) {
 125                         cur_test = &tests[i];
 126
 127                         if (sigsetjmp(escape, 1) == 0) {
 128                                 fprintf(stderr, "Test %d: ", i+1);
 129                                 tests[i].test();
 130                                 fprintf(stderr, "  FAIL: no fault, or handler returned\n");
 131                         }
 132                 }
 133         }
 134
 135         return 0;
 136 }
 137