elf/ifuncmain9.c

   1 /* Test for IFUNC handling with local definitions.
   2    Copyright (C) 2019-2021 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 /* This test is based on gcc.dg/attr-ifunc-4.c.  */
  20
  21 #include <config.h>
  22
  23 # include <stdbool.h>
  24 # include <stdio.h>
  25
  26 /* Do not use the test framework, so that the process setup is not
  27    disturbed.  */
  28
  29 static volatile int implementation_called;
  30 static volatile int resolver_called;
  31
  32 /* Just a random constant, to check that we called the right
  33    function.  */
  34 enum { random_constant = 0x3a88d66d };
  35
  36 static int
  37 implementation (void)
  38 {
  39   ++implementation_called;
  40   return random_constant;
  41 }
  42
  43 static __typeof__ (implementation) *
  44 inhibit_stack_protector
  45 resolver (void)
  46 {
  47   ++resolver_called;
  48   return implementation;
  49 }
  50
  51 static int magic (void) __attribute__ ((ifunc ("resolver")));
  52
  53 int
  54 main (void)
  55 {
  56   bool errors = false;
  57
  58   if (implementation_called != 0)
  59     {
  60       printf ("error: initial value of implementation_called is not zero:"
  61               " %d\n", implementation_called);
  62       errors = true;
  63     }
  64
  65   /* This can be zero if the reference is bound lazily.  */
  66   printf ("info: initial value of resolver_called: %d\n", resolver_called);
  67
  68   int magic_value = magic ();
  69   if (magic_value != random_constant)
  70     {
  71       printf ("error: invalid magic value: 0x%x\n", magic_value);
  72       errors = true;
  73     }
  74
  75   printf ("info: resolver_called value: %d\n", resolver_called);
  76   if (resolver_called == 0)
  77     {
  78       /* In theory, the resolver could be called multiple times if
  79          several relocations are needed.  */
  80       puts ("error: invalid resolver_called value (must not be zero)");
  81       errors = true;
  82     }
  83
  84   printf ("info: implementation_called value: %d\n", implementation_called);
  85   if (implementation_called != 1)
  86     {
  87       puts ("error: invalid implementation_called value (must be 1)");
  88       errors = true;
  89     }
  90
  91   return errors;
  92 }