src/system/runtime_loader/export.cpp

   1 /*
   2  * Copyright 2003-2011, Axel Dörfler, axeld@pinc-software.de.
   3  * Distributed under the terms of the MIT License.
   4  *
   5  * Copyright 2002, Manuel J. Petit. All rights reserved.
   6  * Distributed under the terms of the NewOS License.
   7  */
   8
   9
  10 #include "runtime_loader_private.h"
  11 #include "elf_tls.h"
  12
  13
  14 // exported via the rld_export structure in user space program arguments
  15
  16
  17 static image_id
  18 export_load_add_on(char const *name, uint32 flags)
  19 {
  20         void* handle;
  21         return load_library(name, flags, true, &handle);
  22 }
  23
  24
  25 static status_t
  26 export_unload_add_on(image_id id)
  27 {
  28         return unload_library(NULL, id, true);
  29 }
  30
  31
  32 static image_id
  33 export_load_library(char const *name, uint32 flags, void **_handle)
  34 {
  35         return load_library(name, flags, false, _handle);
  36 }
  37
  38
  39 static status_t
  40 export_unload_library(void* handle)
  41 {
  42         return unload_library(handle, -1, false);
  43 }
  44
  45
  46 struct rld_export gRuntimeLoader = {
  47         // dynamic loading support API
  48         export_load_add_on,
  49         export_unload_add_on,
  50         export_load_library,
  51         export_unload_library,
  52         get_symbol,
  53         get_library_symbol,
  54         get_nth_symbol,
  55         get_nearest_symbol_at_address,
  56         test_executable,
  57         get_executable_architecture,
  58         get_next_image_dependency,
  59         get_tls_address,
  60         destroy_thread_tls,
  61
  62         elf_reinit_after_fork,
  63         NULL, // call_atexit_hooks_for_range
  64         terminate_program,
  65
  66         // the following values will be set later
  67         NULL,   // program_args
  68         NULL,   // commpage_address
  69         0               // ABI version
  70 };
  71
  72 rld_export* __gRuntimeLoader = &gRuntimeLoader;
  73
  74
  75 void
  76 rldexport_init(void)
  77 {
  78         gRuntimeLoader.program_args = gProgramArgs;
  79         gRuntimeLoader.commpage_address = __gCommPageAddress;
  80 }
  81
  82
  83 /*!     Is called for all images, and sets the minimum ABI version found to the
  84         gRuntimeLoader.abi_version field.
  85 */
  86 void
  87 set_abi_version(int abi_version)
  88 {
  89         if (gRuntimeLoader.abi_version == 0
  90                 || gRuntimeLoader.abi_version > abi_version) {
  91                 gRuntimeLoader.abi_version = abi_version;
  92         }
  93 }