sysdeps/x86_64/x32/test-size_t.h

   1 /* Test string/memory functions with size_t in the lower 32 bits of
   2    64-bit register.
   3    Copyright (C) 2019-2023 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #define TEST_MAIN
  21 #include <string/test-string.h>
  22
  23 /* On x32, parameter_t may be passed in a 64-bit register with the LEN
  24    field in the lower 32 bits.  When the LEN field of 64-bit register
  25    is passed to string/memory function as the size_t parameter, only
  26    the lower 32 bits can be used.  */
  27 typedef struct
  28 {
  29   union
  30     {
  31       size_t len;
  32       void (*fn) (void);
  33     };
  34   void *p;
  35 } parameter_t;