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* Added an "add-on" interface for the runtime loader. Pre-loaded images

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can export a structure containing callback hooks invoked by the
  runtime loader when certain image events occur (image loaded,
  relocated, initialized, etc.).
* Also added a mechanism to patch image symbols. For an image callback
  functions can be installed that patch symbols exported or imported by
  the image.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@28475 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold
2008-11-03 13:27:14 +00:00
parent 56eb43e3ca
commit 10b4b5d175
2 changed files with 377 additions and 45 deletions
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headers/private/runtime_loader/runtime_loader.h
+51
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@@ -48,6 +48,8 @@ extern struct rld_export *__gRuntimeLoader;
// #pragma mark - runtime loader debugger interface
struct RuntimeLoaderSymbolPatcher;
typedef struct elf_region_t {
area_id id;
addr_t start;
@@ -103,6 +105,11 @@ typedef struct image_t {
uint32 symbol_resolution_image_count;
struct image_t **symbol_resolution_images;
// Singly-linked list of symbol patchers for symbols defined respectively
// referenced by this image.
struct RuntimeLoaderSymbolPatcher *defined_symbol_patchers;
struct RuntimeLoaderSymbolPatcher *undefined_symbol_patchers;
// describes the text and data regions
uint32 num_regions;
elf_region_t regions[1];
@@ -134,4 +141,48 @@ typedef struct runtime_loader_debug_area {
image_queue_t *loaded_images;
} runtime_loader_debug_area;
// #pragma mark - runtime loader add-on interface
// symbol patcher callback
typedef void runtime_loader_symbol_patcher(void* cookie,
struct image_t* rootImage, struct image_t* image, const char* name,
struct image_t** foundInImage, void** symbol, int32* type);
// interface provided to add-ons
struct runtime_loader_add_on_export {
status_t (*register_defined_symbol_patcher)(struct image_t* image,
runtime_loader_symbol_patcher* patcher, void* cookie);
void (*unregister_defined_symbol_patcher)(struct image_t* image,
runtime_loader_symbol_patcher* patcher, void* cookie);
status_t (*register_undefined_symbol_patcher)(struct image_t* image,
runtime_loader_symbol_patcher* patcher, void* cookie);
void (*unregister_undefined_symbol_patcher)(struct image_t* image,
runtime_loader_symbol_patcher* patcher, void* cookie);
};
#define RUNTIME_LOADER_ADD_ON_VERSION 1
typedef struct runtime_loader_add_on {
uint32 version;
uint32 flags;
// called after the add-on image has been loaded
void (*init)(struct rld_export* standardInterface,
struct runtime_loader_add_on_export* addOnInterface);
// called whenever the respective image event occurs
void (*image_loaded)(struct image_t* image);
void (*image_relocated)(struct image_t* image);
void (*image_initialized)(struct image_t* image);
void (*image_uninitializing)(struct image_t* image);
void (*image_unloading)(struct image_t* image);
} runtime_loader_add_on;
// This is the variable a preloaded shared object has to export to get picked up
// by the runtime loader as an add-on.
extern runtime_loader_add_on __gRuntimeLoaderAddOn;
#endif // _RUNTIME_LOADER_H