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/regset.h>
   9 #include <sys/syscall.h>
  10 #include <sys/ucontext.h>
  11
  12 #define OBIT(eflags) (!!((eflags) & (1 << 11)))
  13 #define SBIT(eflags) (!!((eflags) & (1 << 7)))
  14
  15 static siginfo_t si;
  16 static ucontext_t uc;
  17
  18 static void sighandler(int sig, siginfo_t *sip, void *arg)
  19 {
  20    si = *sip;
  21    uc = *((ucontext_t *) arg);
  22 }
  23
  24 int main(void)
  25 {
  26    struct sigaction sa;
  27    pid_t pid;
  28    int eflags;
  29
  30    sa.sa_sigaction = sighandler;
  31    sa.sa_flags = SA_SIGINFO;
  32    if (sigfillset(&sa.sa_mask)) {
  33       perror("sigfillset");
  34       return 1;
  35    }
  36    if (sigaction(SIGUSR1, &sa, NULL)) {
  37       perror("sigaction");
  38       return 1;
  39    }
  40
  41    pid = getpid();
  42
  43    __asm__ __volatile__(
  44       /* Set overflow and sign flags. */
  45       "movl   $1, %%edx\n"
  46       "addl   $0x7fffffff, %%edx\n"
  47
  48       /* Prepare syscall parameters. */
  49       "pushl  %[sig]\n"
  50       "pushl  %[pid]\n"
  51       "pushl  $0xdeadbeef\n"
  52       "movl   %[scall], %%eax\n"
  53
  54       /* Trigger the signal handler. */
  55       "int    $0x91\n"
  56       "pushfl\n"
  57       "popl   %%edx\n"
  58       "addl   $12, %%esp\n"
  59       : "=d" (eflags)
  60       : [scall] "i" (SYS_kill), [pid] "a" (pid), [sig] "i" (SIGUSR1)
  61       : "cc", "memory");
  62
  63    printf("Values in the signal handler:\n");
  64    printf("  overflow=%d, sign=%d\n",
  65           OBIT(uc.uc_mcontext.gregs[EFL]), SBIT(uc.uc_mcontext.gregs[EFL]));
  66
  67    printf("Values after the return from the signal handler:\n");
  68    printf("  overflow=%d, sign=%d\n", OBIT(eflags), SBIT(eflags));
  69
  70    return 0;
  71 }
  72