bfd/xtensa-dynconfig.c

   1 /* Xtensa configuration settings loader.
   2    Copyright (C) 2022-2023 Free Software Foundation, Inc.
   3
   4    This file is part of BFD, the Binary File Descriptor library.
   5
   6    GCC is free software; you can redistribute it and/or modify it under
   7    the terms of the GNU General Public License as published by the Free
   8    Software Foundation; either version 3, or (at your option) any later
   9    version.
  10
  11    GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12    WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14    for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with GCC; see the file COPYING3.  If not see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include "sysdep.h"
  21 #include "bfd.h"
  22 #include "libbfd.h"
  23
  24 #define XTENSA_CONFIG_DEFINITION
  25 #include "xtensa-config.h"
  26 #include "xtensa-dynconfig.h"
  27
  28 #if defined (HAVE_DLFCN_H)
  29 #include <dlfcn.h>
  30 #elif defined (HAVE_WINDOWS_H)
  31 #include <windows.h>
  32 #endif
  33
  34 #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H)
  35
  36 #define RTLD_LAZY 0      /* Dummy value.  */
  37
  38 static void *
  39 dlopen (const char *file, int mode ATTRIBUTE_UNUSED)
  40 {
  41   return LoadLibrary (file);
  42 }
  43
  44 static void *
  45 dlsym (void *handle, const char *name)
  46 {
  47   return (void *) GetProcAddress ((HMODULE) handle, name);
  48 }
  49
  50 static int ATTRIBUTE_UNUSED
  51 dlclose (void *handle)
  52 {
  53   FreeLibrary ((HMODULE) handle);
  54   return 0;
  55 }
  56
  57 static const char *
  58 dlerror (void)
  59 {
  60   return _("Unable to load DLL.");
  61 }
  62
  63 #endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H)  */
  64
  65 #define CONFIG_ENV_NAME "XTENSA_GNU_CONFIG"
  66
  67 const void *xtensa_load_config (const char *name ATTRIBUTE_UNUSED,
  68                                 const void *no_plugin_def,
  69                                 const void *no_name_def ATTRIBUTE_UNUSED)
  70 {
  71   static int init;
  72 #if BFD_SUPPORTS_PLUGINS
  73   static void *handle;
  74   void *p;
  75
  76   if (!init)
  77     {
  78       const char *path = getenv (CONFIG_ENV_NAME);
  79
  80       init = 1;
  81       if (!path)
  82         return no_plugin_def;
  83       handle = dlopen (path, RTLD_LAZY);
  84       if (!handle)
  85         {
  86           _bfd_error_handler (_("%s is defined but could not be loaded: %s"),
  87                               CONFIG_ENV_NAME, dlerror ());
  88           abort ();
  89         }
  90     }
  91   else if (!handle)
  92     {
  93       return no_plugin_def;
  94     }
  95
  96   p = dlsym (handle, name);
  97   if (!p)
  98     {
  99       if (no_name_def)
 100         return no_name_def;
 101
 102       _bfd_error_handler (_("%s is loaded but symbol \"%s\" is not found: %s"),
 103                           CONFIG_ENV_NAME, name, dlerror ());
 104       abort ();
 105     }
 106   return p;
 107 #else
 108   if (!init)
 109     {
 110       const char *path = getenv (CONFIG_ENV_NAME);
 111
 112       init = 1;
 113       if (path)
 114         {
 115           _bfd_error_handler (_("%s is defined but plugin support is disabled"),
 116                               CONFIG_ENV_NAME);
 117           abort ();
 118         }
 119     }
 120   return no_plugin_def;
 121 #endif
 122 }
 123
 124 XTENSA_CONFIG_INSTANCE_LIST;
 125
 126 const struct xtensa_config_v1 *xtensa_get_config_v1 (void)
 127 {
 128   static const struct xtensa_config_v1 *config;
 129
 130   if (!config)
 131     config = (const struct xtensa_config_v1 *) xtensa_load_config ("xtensa_config_v1",
 132                                                                    &xtensa_config_v1,
 133                                                                    NULL);
 134   return config;
 135 }
 136
 137 const struct xtensa_config_v2 *xtensa_get_config_v2 (void)
 138 {
 139   static const struct xtensa_config_v2 *config;
 140   static const struct xtensa_config_v2 def;
 141
 142   if (!config)
 143     config = (const struct xtensa_config_v2 *) xtensa_load_config ("xtensa_config_v2",
 144                                                                    &xtensa_config_v2,
 145                                                                    &def);
 146   return config;
 147 }