sysdeps/powerpc/tst-tlsifunc.c

   1 /* Test if an executable can read from the TLS from an STT_GNU_IFUNC resolver.
   2    Copyright (C) 2017 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <stdint.h>
  22 #include <inttypes.h>
  23 #include <libc-symbols.h>
  24 #include <tls-macros.h>
  25
  26 __thread int bar;
  27 static int *bar_ptr = NULL;
  28
  29 static uint32_t resolver_platform = 0;
  30
  31 int foo (void);
  32
  33 int tcb_test (void);
  34
  35 /* Offsets copied from tcb-offsets.h.  */
  36 #ifdef __powerpc64__
  37 # define __TPREG     "r13"
  38 # define __ATPLATOFF -28764
  39 #else
  40 # define __TPREG     "r2"
  41 # define __ATPLATOFF -28724
  42 #endif
  43
  44 uint32_t
  45 get_platform (void)
  46 {
  47   register unsigned long tp __asm__ (__TPREG);
  48   uint32_t tmp;
  49
  50   __asm__  ("lwz %0,%1(%2)\n"
  51             : "=r" (tmp)
  52             : "i" (__ATPLATOFF), "b" (tp));
  53
  54   return tmp;
  55 }
  56
  57 void
  58 init_foo (void)
  59 {
  60   bar_ptr = TLS_GD (bar);
  61 }
  62
  63 int
  64 my_foo (void)
  65 {
  66   printf ("&bar = %p and bar_ptr = %p.\n", &bar, bar_ptr);
  67   return bar_ptr != NULL;
  68 }
  69
  70 __ifunc (foo, foo, my_foo, void, init_foo);
  71
  72 void
  73 init_tcb_test (void)
  74 {
  75   resolver_platform = get_platform ();
  76 }
  77
  78 int
  79 my_tcb_test (void)
  80 {
  81   printf ("resolver_platform = 0x%"PRIx32
  82           " and current platform = 0x%"PRIx32".\n",
  83           resolver_platform, get_platform ());
  84   return resolver_platform != 0;
  85 }
  86
  87 __ifunc (tcb_test, tcb_test, my_tcb_test, void, init_tcb_test);
  88
  89 static int
  90 do_test (void)
  91 {
  92   int ret = 0;
  93
  94   if (foo ())
  95     printf ("PASS: foo IFUNC resolver called once.\n");
  96   else
  97     {
  98       printf ("FAIL: foo IFUNC resolver not called once.\n");
  99       ret = 1;
 100     }
 101
 102   if (&bar == bar_ptr)
 103     printf ("PASS: bar address read from IFUNC resolver is correct.\n");
 104   else
 105     {
 106       printf ("FAIL: bar address read from IFUNC resolver is incorrect.\n");
 107       ret = 1;
 108     }
 109
 110   if (tcb_test ())
 111     printf ("PASS: tcb_test IFUNC resolver called once.\n");
 112   else
 113     {
 114       printf ("FAIL: tcb_test IFUNC resolver not called once.\n");
 115       ret = 1;
 116     }
 117
 118   if (resolver_platform == get_platform ())
 119     printf ("PASS: platform read from IFUNC resolver is correct.\n");
 120   else
 121     {
 122       printf ("FAIL: platform read from IFUNC resolver is incorrect.\n");
 123       ret = 1;
 124     }
 125
 126   return ret;
 127 }
 128
 129 #include <support/test-driver.c>