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      1 /* Xtensa configuration settings loader.
      2    Copyright (C) 2022-2025 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 }
    148