281 lines
9.8 KiB
C
281 lines
9.8 KiB
C
/****************************************************************************
|
|
* include/nuttx/binfmt/elf.h
|
|
*
|
|
* Copyright (C) 2012, 2014 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. 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.
|
|
* 3. Neither the name NuttX 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 __INCLUDE_NUTTX_BINFMT_ELF_H
|
|
#define __INCLUDE_NUTTX_BINFMT_ELF_H
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
#include <elf32.h>
|
|
|
|
#include <nuttx/arch.h>
|
|
#include <nuttx/binfmt/binfmt.h>
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
/* Configuration ************************************************************/
|
|
|
|
#ifndef CONFIG_ELF_ALIGN_LOG2
|
|
# define CONFIG_ELF_ALIGN_LOG2 2
|
|
#endif
|
|
|
|
#ifndef CONFIG_ELF_STACKSIZE
|
|
# define CONFIG_ELF_STACKSIZE 2048
|
|
#endif
|
|
|
|
#ifndef CONFIG_ELF_BUFFERSIZE
|
|
# define CONFIG_ELF_BUFFERSIZE 128
|
|
#endif
|
|
|
|
#ifndef CONFIG_ELF_BUFFERINCR
|
|
# define CONFIG_ELF_BUFFERINCR 32
|
|
#endif
|
|
|
|
/* Allocation array size and indices */
|
|
|
|
#define LIBELF_ELF_ALLOC 0
|
|
#ifdef CONFIG_BINFMT_CONSTRUCTORS
|
|
# define LIBELF_CTORS_ALLOC 1
|
|
# define LIBELF_CTPRS_ALLOC 2
|
|
# define LIBELF_NALLOC 3
|
|
#else
|
|
# define LIBELF_NALLOC 1
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Public Types
|
|
****************************************************************************/
|
|
|
|
/* This struct provides a description of the currently loaded instantiation
|
|
* of an ELF binary.
|
|
*/
|
|
|
|
struct elf_loadinfo_s
|
|
{
|
|
/* elfalloc is the base address of the memory that is allocated to hold the
|
|
* ELF program image.
|
|
*
|
|
* If CONFIG_ARCH_ADDRENV=n, elfalloc will be allocated using kmm_malloc() (or
|
|
* kmm_zalloc()). If CONFIG_ARCH_ADDRENV-y, then elfalloc will be allocated using
|
|
* up_addrenv_create(). In either case, there will be a unique instance
|
|
* of elfalloc (and stack) for each instance of a process.
|
|
*
|
|
* The alloc[] array in struct binary_s will hold memory that persists after
|
|
* the ELF module has been loaded.
|
|
*/
|
|
|
|
uintptr_t textalloc; /* .text memory allocated when ELF file was loaded */
|
|
uintptr_t dataalloc; /* .bss/.data memory allocated when ELF file was loaded */
|
|
size_t textsize; /* Size of the ELF .text memory allocation */
|
|
size_t datasize; /* Size of the ELF .bss/.data memory allocation */
|
|
off_t filelen; /* Length of the entire ELF file */
|
|
Elf32_Ehdr ehdr; /* Buffered ELF file header */
|
|
FAR Elf32_Shdr *shdr; /* Buffered ELF section headers */
|
|
uint8_t *iobuffer; /* File I/O buffer */
|
|
|
|
/* Constructors and destructors */
|
|
|
|
#ifdef CONFIG_BINFMT_CONSTRUCTORS
|
|
FAR void *ctoralloc; /* Memory allocated for ctors */
|
|
FAR void *dtoralloc; /* Memory allocated dtors */
|
|
FAR binfmt_ctor_t *ctors; /* Pointer to a list of constructors */
|
|
FAR binfmt_dtor_t *dtors; /* Pointer to a list of destructors */
|
|
uint16_t nctors; /* Number of constructors */
|
|
uint16_t ndtors; /* Number of destructors */
|
|
#endif
|
|
|
|
/* Address environment.
|
|
*
|
|
* addrenv - This is the handle created by up_addrenv_create() that can be
|
|
* used to manage the tasks address space.
|
|
* oldenv - This is a value returned by up_addrenv_select() that must be
|
|
* used to restore the current address environment.
|
|
*/
|
|
|
|
#ifdef CONFIG_ARCH_ADDRENV
|
|
group_addrenv_t addrenv; /* Task group address environment */
|
|
save_addrenv_t oldenv; /* Saved address environment */
|
|
#endif
|
|
|
|
uint16_t symtabidx; /* Symbol table section index */
|
|
uint16_t strtabidx; /* String table section index */
|
|
uint16_t buflen; /* size of iobuffer[] */
|
|
int filfd; /* Descriptor for the file being loaded */
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
#undef EXTERN
|
|
#if defined(__cplusplus)
|
|
#define EXTERN extern "C"
|
|
extern "C"
|
|
{
|
|
#else
|
|
#define EXTERN extern
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* These are APIs exported by libelf (but are used only by the binfmt logic):
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: elf_init
|
|
*
|
|
* Description:
|
|
* This function is called to configure the library to process an ELF
|
|
* program binary.
|
|
*
|
|
* Returned Value:
|
|
* 0 (OK) is returned on success and a negated errno is returned on
|
|
* failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int elf_init(FAR const char *filename, FAR struct elf_loadinfo_s *loadinfo);
|
|
|
|
/****************************************************************************
|
|
* Name: elf_uninit
|
|
*
|
|
* Description:
|
|
* Releases any resources committed by elf_init(). This essentially
|
|
* undoes the actions of elf_init.
|
|
*
|
|
* Returned Value:
|
|
* 0 (OK) is returned on success and a negated errno is returned on
|
|
* failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int elf_uninit(FAR struct elf_loadinfo_s *loadinfo);
|
|
|
|
/****************************************************************************
|
|
* Name: elf_load
|
|
*
|
|
* Description:
|
|
* Loads the binary into memory, allocating memory, performing relocations
|
|
* and initializing the data and bss segments.
|
|
*
|
|
* Returned Value:
|
|
* 0 (OK) is returned on success and a negated errno is returned on
|
|
* failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int elf_load(FAR struct elf_loadinfo_s *loadinfo);
|
|
|
|
/****************************************************************************
|
|
* Name: elf_bind
|
|
*
|
|
* Description:
|
|
* Bind the imported symbol names in the loaded module described by
|
|
* 'loadinfo' using the exported symbol values provided by 'symtab'.
|
|
*
|
|
* Returned Value:
|
|
* 0 (OK) is returned on success and a negated errno is returned on
|
|
* failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
struct symtab_s;
|
|
int elf_bind(FAR struct elf_loadinfo_s *loadinfo,
|
|
FAR const struct symtab_s *exports, int nexports);
|
|
|
|
/****************************************************************************
|
|
* Name: elf_unload
|
|
*
|
|
* Description:
|
|
* This function unloads the object from memory. This essentially undoes
|
|
* the actions of elf_load. It is called only under certain error
|
|
* conditions after the module has been loaded but not yet started.
|
|
*
|
|
* Returned Value:
|
|
* 0 (OK) is returned on success and a negated errno is returned on
|
|
* failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int elf_unload(struct elf_loadinfo_s *loadinfo);
|
|
|
|
/****************************************************************************
|
|
* These are APIs used outside of binfmt by NuttX:
|
|
****************************************************************************/
|
|
/****************************************************************************
|
|
* Name: elf_initialize
|
|
*
|
|
* Description:
|
|
* ELF support is built unconditionally. However, in order to
|
|
* use this binary format, this function must be called during system
|
|
* initialization in order to register the ELF binary format.
|
|
*
|
|
* Returned Value:
|
|
* This is a NuttX internal function so it follows the convention that
|
|
* 0 (OK) is returned on success and a negated errno is returned on
|
|
* failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int elf_initialize(void);
|
|
|
|
/****************************************************************************
|
|
* Name: elf_uninitialize
|
|
*
|
|
* Description:
|
|
* Unregister the ELF binary loader
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
****************************************************************************/
|
|
|
|
void elf_uninitialize(void);
|
|
|
|
#undef EXTERN
|
|
#if defined(__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif /* __INCLUDE_NUTTX_BINFMT_ELF_H */
|