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/*
* dload.h
*
* Define internal data structures used by core dynamic loader.
*
* Copyright (C) 2009-2014 Texas Instruments Incorporated - http://www.ti.com/
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* Neither the name of Texas Instruments Incorporated nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef DLOAD_H
#define DLOAD_H
#include "ArrayList.h"
#include "Queue.h"
#include "Stack.h"
#include "elf32.h"
#include "dload_api.h"
#include "util.h"
/*---------------------------------------------------------------------------*/
/* Contains strings with names of files the loader is in process of loading. */
/* This list is used to keep track of what objects are in the process of */
/* loading while their dependents are being loaded so that we can detect */
/* circular dependencies. */
/*---------------------------------------------------------------------------*/
extern Array_List DLIMP_module_dependency_list;
/*---------------------------------------------------------------------------*/
/* DLIMP_Loaded_Segment */
/* */
/* This structure represents a segment loaded on memory. */
/* */
/* This data structure should be created using host memory when a module */
/* is being loaded into target memory. The data structure should persist */
/* as long as the module stays resident in target memory. It should be */
/* removed when the last use of the module is unloaded from the target. */
/*---------------------------------------------------------------------------*/
typedef struct
{
struct Elf32_Phdr phdr;
Elf32_Addr input_vaddr; /* original segment load addr */
BOOL modified;
struct DLOAD_MEMORY_SEGMENT *obj_desc;
void * host_address;
} DLIMP_Loaded_Segment;
/*---------------------------------------------------------------------------*/
/* DLIMP_Loaded_Module */
/* */
/* This structure contains all the information the dynamic loader needs */
/* to retain after loading an object file's segments into target memory. */
/* The data structure is created while the object file is being loaded, */
/* and should persist until the last use of the module is unloaded from */
/* target memory. */
/* */
/* The information contained here is used by the dynamic loader to */
/* perform dynamic symbol resolution, to track the use count, and to */
/* finally deallocate the module's segments when the module is unloaded. */
/*---------------------------------------------------------------------------*/
typedef struct
{
char *name; /* Local copy of so_name */
int32_t file_handle;
int32_t use_count;
Elf32_Addr entry_point; /* Entry point address into module */
struct Elf32_Sym *gsymtab; /* Module's global symbol table */
Elf32_Word gsymnum; /* # global symbols */
char *gstrtab; /* Module's global symbol names */
Elf32_Word gstrsz; /* Size of global string table */
Array_List loaded_segments; /* List of DLIMP_Loaded_Segment(s) */
Array_List dependencies; /* List of dependent file handles */
BOOL direct_dependent_only;
Elf32_Addr fini; /* .fini function/section address */
Elf32_Addr fini_array; /* .fini_array term fcn ary addr */
int32_t fini_arraysz; /* sizeof .fini_array */
uint8_t *c_args; /* address of module's .args sect */
uint8_t *static_base; /* address of module's STATIC_BASE */
} DLIMP_Loaded_Module;
/*---------------------------------------------------------------------------*/
/* DLIMP_loaded_objects */
/* */
/* A list of loaded module objects (DLIMP_Loaded_Module *) that the */
/* loader has placed into target memory. */
/*---------------------------------------------------------------------------*/
TYPE_QUEUE_DEFINITION(DLIMP_Loaded_Module*, loaded_module_ptr)
extern loaded_module_ptr_Queue DLIMP_loaded_objects;
/*---------------------------------------------------------------------------*/
/* DLIMP_Dynamic_Module */
/* */
/* This structure represents a dynamic module to be loaded by the dynamic */
/* loader. It contains all the information necessary to load and relocate */
/* the module. It actually contains most of the headers, dynamic info, */
/* dynamic symbol table, string table etc. */
/* */
/* This structure is allocated in host memory while an ELF object file is */
/* being loaded and will be destructed after the file has been */
/* successfully loaded. To simplify loading and relocation of the object */
/* file's segments, this data structure maintains a link to the loaded */
/* module. This link is severed when the load is successfully completed. */
/* The loaded module data structure will persist until the module is */
/* actually unloaded from target memory, but this data structure will be */
/* freed. */
/* */
/* If the load of the object file is not successful for any reason, then */
/* the loaded module will not be detached from the dynamic module. In */
/* such case, the destructor for the dynamic module will assume */
/* responsibility for freeing any host memory associated with the loaded */
/* module and its segments. */
/*---------------------------------------------------------------------------*/
typedef struct
{
char *name; /* Local copy of so_name */
LOADER_FILE_DESC *fd; /* Access to ELF object file */
struct Elf32_Ehdr fhdr; /* ELF Object File Header */
struct Elf32_Phdr *phdr; /* ELF Program Header Table */
Elf32_Word phnum; /* # entries in program header table */
char* strtab; /* String Table */
Elf32_Word strsz; /* String Table size in bytes */
struct Elf32_Dyn *dyntab; /* Elf Dynamic Table (.dynamic scn) */
/* This contains a list of dynamic */
/* tags which is terminated by a NULL */
/* record. */
struct Elf32_Sym *symtab; /* Elf Dynamic Symbol Table */
Elf32_Word symnum; /* # symbols in dynamic symbol table */
Elf32_Word gsymtab_offset;/* Offset into symbol table where */
/* global symbols start. */
Elf32_Word gstrtab_offset;/* Offset into string table where */
/* global symbol names start. */
uint8_t *c_args;
uint8_t *static_base; /* address of module's STATIC_BASE */
int32_t argc;
char **argv;
DLIMP_Loaded_Module *loaded_module;
int32_t wrong_endian;
BOOL direct_dependent_only;
BOOL relocatable; /* TRUE if module can be relocated */
/* at load-time. FALSE if module is */
/* a static executable. */
BOOL relocate_entry_point; /* TRUE if the entry point has */
/* not been relocated */
int32_t dsbt_index; /* DSBT index requested/assigned */
uint32_t dsbt_size; /* DSBT size for this module */
int32_t dsbt_base_tagidx;/* Location of DSBT base dyn tag */
int32_t preinit_array_idx; /* DT_PREINIT_ARRAY dyn tag loc */
int32_t preinit_arraysz; /* sizeof pre-init array */
int32_t init_idx; /* DT_INIT dynamic tag location */
int32_t init_array_idx; /* DT_INIT_ARRAY dyn tag location */
int32_t init_arraysz; /* sizeof init array */
} DLIMP_Dynamic_Module;
/*---------------------------------------------------------------------------*/
/* DLIMP_dependency_stack */
/* */
/* A LIFO stack of dynamic module objects (DLIMP_Dynamic_Module *) that */
/* is retained while dependent files are being loaded and allocated. It */
/* is used to guide which dynamic modules need to be relocated after all */
/* items in the dependency graph have been allocated. The stack is only */
/* used when the client asks the core loader to load a dynamic executable */
/* or library. When relocation is completed, this stack should be empty. */
/*---------------------------------------------------------------------------*/
TYPE_STACK_DEFINITION(DLIMP_Dynamic_Module*, dynamic_module_ptr)
extern dynamic_module_ptr_Stack DLIMP_dependency_stack;
/*---------------------------------------------------------------------------*/
/* Private Loader Object instance. */
/*---------------------------------------------------------------------------*/
typedef struct
{
/*-----------------------------------------------------------------------*/
/* Contains filenames (type const char*) the system is in the process of */
/* loading. Used to detect cycles in incorrectly compiled ELF binaries. */
/*-----------------------------------------------------------------------*/
Array_List DLIMP_module_dependency_list;
/*-----------------------------------------------------------------------*/
/* Contains objects (type DLIMP_Loaded_Module) that the system has loaded*/
/* into target memory. */
/*-----------------------------------------------------------------------*/
loaded_module_ptr_Queue DLIMP_loaded_objects;
/*-----------------------------------------------------------------------*/
/* Dependency Graph Queue - FIFO queue of dynamic modules that are loaded*/
/* when client asks to load a dynamic executable or library. Note that */
/* dependents that have already been loaded with another module will not */
/* appear on this queue. */
/*-----------------------------------------------------------------------*/
dynamic_module_ptr_Stack DLIMP_dependency_stack;
/*-----------------------------------------------------------------------*/
/* Counter for generating unique IDs for file handles. */
/* NOTE: File handle is assigned sequencially but is never reclaimed */
/* when the modules are unloaded. It is conceivable that a loader*/
/* running for a long time and loading and unloading modules */
/* could wrap-around. The loader generates error in this case. */
/* Presumably each loader instance has a list of file handles, one for */
/* each file that it loads, and the file handle serves as an index into */
/* the list. Therefore even if the same file is loaded by two loader */
/* instances, both loader instances have a different file handle for the */
/* file - the file is mapped uniquely to it's appopriate file handle per */
/* loader instance. */
/*-----------------------------------------------------------------------*/
int32_t file_handle;
/*-----------------------------------------------------------------------*/
/* Client token, passed in via DLOAD_create() */
/*-----------------------------------------------------------------------*/
void * client_handle;
} LOADER_OBJECT;
/*****************************************************************************/
/* IF data : Below are the data structures used to store init-fini data. */
/*****************************************************************************/
typedef struct
{
TARGET_ADDRESS sect_addr;
int32_t size;
}
IF_single_record;
TYPE_QUEUE_DEFINITION(IF_single_record*, IF_table)
extern IF_table_Queue TI_init_table;
/*****************************************************************************/
/* Container used to read in argc, argv from the .srgs section. */
/*****************************************************************************/
typedef struct { int argc; char *argv[1]; } ARGS_CONTAINER;
/*****************************************************************************/
/* is_DSBT_module() */
/* */
/* return true if the module uses DSBT model */
/*****************************************************************************/
static inline BOOL is_dsbt_module(DLIMP_Dynamic_Module *dyn_module)
{
return (dyn_module->dsbt_size != 0);
}
/*****************************************************************************/
/* is_arm_module() */
/* */
/* return true if the module being processed is for ARM */
/*****************************************************************************/
static inline BOOL is_arm_module(struct Elf32_Ehdr* fhdr)
{
return fhdr->e_machine == EM_ARM;
}
/*****************************************************************************/
/* is_c60_module() */
/* */
/* return true if the module being processed is for C60 */
/*****************************************************************************/
static inline BOOL is_c60_module(struct Elf32_Ehdr* fhdr)
{
return fhdr->e_machine == EM_TI_C6000;
}
/*---------------------------------------------------------------------------*/
/* DLIMP_update_dyntag_section_address() */
/* */
/* Given the index of a dynamic tag which we happen to know points to a */
/* section address, find the program header table entry associated with */
/* the specified address and update the tag value with the real address */
/* of the section. */
/* */
/*---------------------------------------------------------------------------*/
extern BOOL DLIMP_update_dyntag_section_address(DLIMP_Dynamic_Module *dyn_module,
int32_t i);
extern uint32_t DLIMP_get_first_dyntag(int tag, struct Elf32_Dyn* dyn_table);
/*---------------------------------------------------------------------------*/
/* Global flags to help manage internal debug and profiling efforts. */
/*---------------------------------------------------------------------------*/
#ifndef __TI_COMPILER_VERSION__
#define LOADER_DEBUG 1
#else
#define LOADER_DEBUG 0
#endif
#undef LOADER_DEBUG
#define LOADER_DEBUG 1
#define LOADER_PROFILE 1
#if LOADER_DEBUG
extern BOOL debugging_on;
#endif
#if LOADER_DEBUG || LOADER_PROFILE
extern BOOL profiling_on;
#endif
#endif
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