memcheck/tests/x86-solaris/context_eflags.c

   1 /* x86 variant of the amd64-solaris/context_rflags.c test. */
   2
   3 #include <assert.h>
   4 #include <signal.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <unistd.h>
   8 #include <sys/syscall.h>
   9 #include <sys/ucontext.h>
  10
  11 #define OBIT(eflags) (!!((eflags) & (1 << 11)))
  12 #define SBIT(eflags) (!!((eflags) & (1 << 7)))
  13
  14 static siginfo_t si;
  15 static ucontext_t uc;
  16
  17 static void sighandler(int sig, siginfo_t *sip, ucontext_t *ucp)
  18 {
  19    si = *sip;
  20    uc = *ucp;
  21 }
  22
  23 int main(void)
  24 {
  25    struct sigaction sa;
  26    pid_t pid;
  27    int eflags;
  28
  29    sa.sa_handler = sighandler;
  30    sa.sa_flags = SA_SIGINFO;
  31    if (sigfillset(&sa.sa_mask)) {
  32       perror("sigfillset");
  33       return 1;
  34    }
  35    if (sigaction(SIGUSR1, &sa, NULL)) {
  36       perror("sigaction");
  37       return 1;
  38    }
  39
  40    pid = getpid();
  41
  42    __asm__ __volatile__(
  43       /* Set overflow and sign flags. */
  44       "movl   $1, %%edx\n"
  45       "addl   $0x7fffffff, %%edx\n"
  46
  47       /* Prepare syscall parameters. */
  48       "pushl  %[sig]\n"
  49       "pushl  %[pid]\n"
  50       "pushl  $0xdeadbeef\n"
  51       "movl   %[scall], %%eax\n"
  52
  53       /* Trigger the signal handler. */
  54       "int    $0x91\n"
  55       "pushfl\n"
  56       "popl   %%edx\n"
  57       "addl   $12, %%esp\n"
  58       : "=d" (eflags)
  59       : [scall] "i" (SYS_kill), [pid] "a" (pid), [sig] "i" (SIGUSR1)
  60       : "cc", "memory");
  61
  62    printf("Values in the signal handler:\n");
  63    printf("  overflow=%d, sign=%d\n",
  64           OBIT(uc.uc_mcontext.gregs[EFL]), SBIT(uc.uc_mcontext.gregs[EFL]));
  65
  66    printf("Values after the return from the signal handler:\n");
  67    printf("  overflow=%d, sign=%d\n", OBIT(eflags), SBIT(eflags));
  68
  69    return 0;
  70 }
  71