sysdeps/unix/sysv/linux/i386/dl-cache.h

   1 /* Support for reading /etc/ld.so.cache files written by Linux ldconfig.
   2    Copyright (C) 2004 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 static inline int
  21 is_ia64 (void)
  22 {
  23   unsigned int fl1, fl2;
  24
  25   /* See if we can use cpuid.  */
  26   __asm__ ("pushfl; pushfl; popl %0; movl %0,%1; xorl %2,%0;"
  27            "pushl %0; popfl; pushfl; popl %0; popfl"
  28            : "=&r" (fl1), "=&r" (fl2)
  29            : "i" (0x00200000));
  30   if (((fl1 ^ fl2) & 0x00200000) == 0)
  31     return 0;
  32
  33   /* Host supports cpuid.  See if cpuid gives capabilities, try
  34      CPUID(0).  Preserve %ebx and %ecx; cpuid insn clobbers these, we
  35      don't need their CPUID values here, and %ebx may be the PIC
  36      register.  */
  37   __asm__ ("pushl %%ecx; pushl %%ebx; cpuid; popl %%ebx; popl %%ecx"
  38            : "=a" (fl1) : "0" (0) : "edx", "cc");
  39   if (fl1 == 0)
  40     return 0;
  41
  42   /* Invoke CPUID(1), return %edx; caller can examine bits to
  43      determine what's supported.  */
  44   __asm__ ("pushl %%ecx; pushl %%ebx; cpuid; popl %%ebx; popl %%ecx"
  45            : "=d" (fl2), "=a" (fl1) : "1" (1) : "cc");
  46   return (fl2 & (1 << 30)) != 0;
  47 }
  48
  49 #define arch_startup(argc, argv) \
  50   do {                                                                  \
  51     /* On IA-64, try to execute 64-bit ldconfig if possible.            \
  52        This is because the badly designed /emul/ia32-linux hack         \
  53        will cause 32-bit ldconfig to do all sorts of weird things.  */  \
  54     if (is_ia64 ())                                                     \
  55       execv ("/emul/ia32-linux/../../sbin/ldconfig",                    \
  56              (char *const *) argv);                                     \
  57   } while (0)
  58
  59 #include_next <dl-cache.h>