LXR linux/tools/testing/selftests/x86/test

   1// SPDX-License-Identifier: GPL-2.0
   2#undef _GNU_SOURCE
   3#define _GNU_SOURCE 1
   4#undef __USE_GNU
   5#define __USE_GNU 1
   6#include <unistd.h>
   7#include <stdlib.h>
   8#include <string.h>
   9#include <stdio.h>
  10#include <signal.h>
  11#include <sys/types.h>
  12#include <sys/select.h>
  13#include <sys/time.h>
  14#include <sys/wait.h>
  15
  16#define TEST(insn) \
  17long double __attribute__((noinline)) insn(long flags) \
  18{                                               \
  19        long double out;                        \
  20        asm ("\n"                               \
  21        "       push    %1""\n"                 \
  22        "       popf""\n"                       \
  23        "       fldpi""\n"                      \
  24        "       fld1""\n"                       \
  25        "       " #insn " %%st(1), %%st" "\n"   \
  26        "       ffree   %%st(1)" "\n"           \
  27        : "=t" (out)                            \
  28        : "r" (flags)                           \
  29        );                                      \
  30        return out;                             \
  31}
  32
  33TEST(fcmovb)
  34TEST(fcmove)
  35TEST(fcmovbe)
  36TEST(fcmovu)
  37TEST(fcmovnb)
  38TEST(fcmovne)
  39TEST(fcmovnbe)
  40TEST(fcmovnu)
  41
  42enum {
  43        CF = 1 << 0,
  44        PF = 1 << 2,
  45        ZF = 1 << 6,
  46};
  47
  48void sighandler(int sig)
  49{
  50        printf("[FAIL]\tGot signal %d, exiting\n", sig);
  51        exit(1);
  52}
  53
  54int main(int argc, char **argv, char **envp)
  55{
  56        int err = 0;
  57
  58        /* SIGILL triggers on 32-bit kernels w/o fcomi emulation
  59         * when run with "no387 nofxsr". Other signals are caught
  60         * just in case.
  61         */
  62        signal(SIGILL, sighandler);
  63        signal(SIGFPE, sighandler);
  64        signal(SIGSEGV, sighandler);
  65
  66        printf("[RUN]\tTesting fcmovCC instructions\n");
  67        /* If fcmovCC() returns 1.0, the move wasn't done */
  68        err |= !(fcmovb(0)   == 1.0); err |= !(fcmovnb(0)  != 1.0);
  69        err |= !(fcmove(0)   == 1.0); err |= !(fcmovne(0)  != 1.0);
  70        err |= !(fcmovbe(0)  == 1.0); err |= !(fcmovnbe(0) != 1.0);
  71        err |= !(fcmovu(0)   == 1.0); err |= !(fcmovnu(0)  != 1.0);
  72
  73        err |= !(fcmovb(CF)  != 1.0); err |= !(fcmovnb(CF)  == 1.0);
  74        err |= !(fcmove(CF)  == 1.0); err |= !(fcmovne(CF)  != 1.0);
  75        err |= !(fcmovbe(CF) != 1.0); err |= !(fcmovnbe(CF) == 1.0);
  76        err |= !(fcmovu(CF)  == 1.0); err |= !(fcmovnu(CF)  != 1.0);
  77
  78        err |= !(fcmovb(ZF)  == 1.0); err |= !(fcmovnb(ZF)  != 1.0);
  79        err |= !(fcmove(ZF)  != 1.0); err |= !(fcmovne(ZF)  == 1.0);
  80        err |= !(fcmovbe(ZF) != 1.0); err |= !(fcmovnbe(ZF) == 1.0);
  81        err |= !(fcmovu(ZF)  == 1.0); err |= !(fcmovnu(ZF)  != 1.0);
  82
  83        err |= !(fcmovb(PF)  == 1.0); err |= !(fcmovnb(PF)  != 1.0);
  84        err |= !(fcmove(PF)  == 1.0); err |= !(fcmovne(PF)  != 1.0);
  85        err |= !(fcmovbe(PF) == 1.0); err |= !(fcmovnbe(PF) != 1.0);
  86        err |= !(fcmovu(PF)  != 1.0); err |= !(fcmovnu(PF)  == 1.0);
  87
  88        if (!err)
  89                printf("[OK]\tfcmovCC\n");
  90        else
  91                printf("[FAIL]\tfcmovCC errors: %d\n", err);
  92
  93        return err;
  94}
  95