1  /* Check ISA level on shared object in glibc-hwcaps subdirectories.
       2     Copyright (C) 2021-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <stdbool.h>
      20  #include <stdlib.h>
      21  #include <stdio.h>
      22  #include <elf.h>
      23  #include <get-isa-level.h>
      24  #include <support/check.h>
      25  #include <support/test-driver.h>
      26  
      27  extern int dso_isa_level (void);
      28  
      29  static int
      30  do_test (void)
      31  {
      32    const struct cpu_features *cpu_features = __get_cpu_features ();
      33    unsigned int isa_level = get_isa_level (cpu_features);
      34    bool has_isa_baseline = ((isa_level & GNU_PROPERTY_X86_ISA_1_BASELINE)
      35  			   == GNU_PROPERTY_X86_ISA_1_BASELINE);
      36    bool has_isa_v2 = ((isa_level & GNU_PROPERTY_X86_ISA_1_V2)
      37  			   == GNU_PROPERTY_X86_ISA_1_V2);
      38    bool has_isa_v3 = ((isa_level & GNU_PROPERTY_X86_ISA_1_V3)
      39  			   == GNU_PROPERTY_X86_ISA_1_V3);
      40    bool has_isa_v4 = ((isa_level & GNU_PROPERTY_X86_ISA_1_V4)
      41  			   == GNU_PROPERTY_X86_ISA_1_V4);
      42  
      43    if (!has_isa_baseline)
      44      return EXIT_FAILURE;
      45  
      46    int level = dso_isa_level ();
      47    int ret;
      48    switch (level)
      49      {
      50      case 1:
      51      case 2:
      52        /* The default libx86-64-isa-level.so is used.  */
      53        printf ("The default shared library is used.\n");
      54        if (has_isa_v3 || has_isa_v4 || (!has_isa_v2 && level == 2))
      55  	ret = EXIT_FAILURE;
      56        else
      57  	ret = EXIT_SUCCESS;
      58        break;
      59      case 3:
      60        /* libx86-64-isa-level.so marked as x86-64 ISA level 3 needed in
      61  	 x86-64-v2 should be ignored on lesser CPU.  */
      62        printf ("x86-64 ISA level 3 shared library is used.\n");
      63        if (has_isa_v4 || !has_isa_v3)
      64  	ret = EXIT_FAILURE;
      65        else
      66  	ret = EXIT_SUCCESS;
      67        break;
      68      case 4:
      69        /* libx86-64-isa-level.so marked as x86-64 ISA level 4 needed in
      70  	 x86-64-v3 should be ignored on lesser CPU.  */
      71        printf ("x86-64 ISA level 4 shared library is used.\n");
      72        if (has_isa_v4)
      73  	ret = EXIT_SUCCESS;
      74        else
      75  	ret = EXIT_FAILURE;
      76        break;
      77      default:
      78        abort ();
      79      }
      80    return ret;
      81  }
      82  
      83  #include <support/test-driver.c>