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

   1 /* Support for reading /etc/ld.so.cache files written by Linux ldconfig.
   2    Copyright (C) 2003-2019 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 <ldconfig.h>
  20
  21 /* For now we only support the natural XLEN ABI length on all targets, so the
  22    only bits that need to go into ld.so.cache are the FLEG ABI length.  */
  23 #if defined __riscv_float_abi_double
  24 # define _DL_CACHE_DEFAULT_ID    (FLAG_RISCV_FLOAT_ABI_DOUBLE | FLAG_ELF_LIBC6)
  25 #else
  26 # define _DL_CACHE_DEFAULT_ID    (FLAG_RISCV_FLOAT_ABI_SOFT | FLAG_ELF_LIBC6)
  27 #endif
  28
  29 #define _dl_cache_check_flags(flags)                                    \
  30   ((flags) == _DL_CACHE_DEFAULT_ID)
  31
  32 /* If given a path to one of our library directories, adds every library
  33    directory via add_dir (), otherwise just adds the giver directory.  On
  34    RISC-V, libraries can be found in paths ending in:
  35      - /lib64/lp64d
  36      - /lib64/lp64
  37      - /lib (only ld.so)
  38    so this will add all of those paths.
  39
  40    According to Joseph Myers:
  41        My reasoning for that would be: generic autoconf-configured (etc.)
  42        software may only know about using the lib directory, so you want the
  43        lib directory to be searched regardless of the ABI - but it's also
  44        useful to be able to e.g. list /usr/local/lib in /etc/ld.so.conf for all
  45        architectures and have that automatically imply /usr/local/lib64/lp64d
  46        etc. so that libraries can be found that come from software that does
  47        use the ABI-specific directories.  */
  48 #define add_system_dir(dir)                                             \
  49   do                                                                    \
  50     {                                                                   \
  51       size_t len = strlen (dir);                                        \
  52       char path[len + 9];                                               \
  53       memcpy (path, dir, len + 1);                                      \
  54       if (len >= 12 && ! memcmp(path + len - 12, "/lib64/lp64d", 12))   \
  55         {                                                               \
  56           len -= 8;                                                     \
  57           path[len] = '\0';                                             \
  58         }                                                               \
  59       if (len >= 11 && ! memcmp(path + len - 11, "/lib64/lp64", 11))    \
  60         {                                                               \
  61           len -= 7;                                                     \
  62           path[len] = '\0';                                             \
  63         }                                                               \
  64       add_dir (path);                                                   \
  65       if (len >= 4 && ! memcmp(path + len - 4, "/lib", 4))              \
  66         {                                                               \
  67           memcpy (path + len, "64/lp64d", 9);                           \
  68           add_dir (path);                                               \
  69           memcpy (path + len, "64/lp64", 8);                            \
  70           add_dir (path);                                               \
  71         }                                                               \
  72     } while (0)
  73
  74
  75 #include_next <dl-cache.h>