266 lines
8.8 KiB
C
266 lines
8.8 KiB
C
/****************************************************************************
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* binfmt/libmodule/libmodule.h
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*
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* Copyright (C) 2012, 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __BINFMT_LIBELF_LIBELF_H
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#define __BINFMT_LIBELF_LIBELF_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <elf32.h>
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#include <nuttx/arch.h>
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#include <nuttx/binfmt/module.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/****************************************************************************
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* Name: mod_verifyheader
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*
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* Description:
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* Given the header from a possible ELF executable, verify that it is
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* an ELF executable.
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*
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* Returned Value:
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* 0 (OK) is returned on success and a negated errno is returned on
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* failure.
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*
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****************************************************************************/
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int mod_verifyheader(FAR const Elf32_Ehdr *header);
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/****************************************************************************
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* Name: mod_read
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*
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* Description:
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* Read 'readsize' bytes from the object file at 'offset'. The data is
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* read into 'buffer.'
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*
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* Returned Value:
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* 0 (OK) is returned on success and a negated errno is returned on
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* failure.
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*
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****************************************************************************/
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int mod_read(FAR struct mod_loadinfo_s *loadinfo, FAR uint8_t *buffer,
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size_t readsize, off_t offset);
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/****************************************************************************
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* Name: mod_loadshdrs
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*
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* Description:
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* Loads section headers into memory.
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*
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* Returned Value:
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* 0 (OK) is returned on success and a negated errno is returned on
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* failure.
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*
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****************************************************************************/
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int mod_loadshdrs(FAR struct mod_loadinfo_s *loadinfo);
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/****************************************************************************
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* Name: mod_findsection
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*
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* Description:
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* A section by its name.
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*
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* Input Parameters:
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* loadinfo - Load state information
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* sectname - Name of the section to find
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*
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* Returned Value:
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* On success, the index to the section is returned; A negated errno value
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* is returned on failure.
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*
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****************************************************************************/
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int mod_findsection(FAR struct mod_loadinfo_s *loadinfo,
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FAR const char *sectname);
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/****************************************************************************
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* Name: mod_findsymtab
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*
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* Description:
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* Find the symbol table section.
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*
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* Returned Value:
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* 0 (OK) is returned on success and a negated errno is returned on
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* failure.
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*
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****************************************************************************/
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int mod_findsymtab(FAR struct mod_loadinfo_s *loadinfo);
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/****************************************************************************
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* Name: mod_readsym
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*
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* Description:
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* Read the ELFT symbol structure at the specfied index into memory.
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*
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* Input Parameters:
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* loadinfo - Load state information
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* index - Symbol table index
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* sym - Location to return the table entry
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*
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* Returned Value:
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* 0 (OK) is returned on success and a negated errno is returned on
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* failure.
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*
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****************************************************************************/
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int mod_readsym(FAR struct mod_loadinfo_s *loadinfo, int index,
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FAR Elf32_Sym *sym);
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/****************************************************************************
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* Name: mod_symvalue
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*
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* Description:
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* Get the value of a symbol. The updated value of the symbol is returned
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* in the st_value field of the symbol table entry.
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*
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* Input Parameters:
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* loadinfo - Load state information
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* sym - Symbol table entry (value might be undefined)
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* exports - The symbol table to use for resolving undefined symbols.
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* nexports - Number of symbols in the symbol table.
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*
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* Returned Value:
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* 0 (OK) is returned on success and a negated errno is returned on
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* failure.
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*
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* EINVAL - There is something inconsistent in the symbol table (should only
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* happen if the file is corrupted)
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* ENOSYS - Symbol lies in common
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* ESRCH - Symbol has no name
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* ENOENT - Symbol undefined and not provided via a symbol table
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*
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****************************************************************************/
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int mod_symvalue(FAR struct mod_loadinfo_s *loadinfo, FAR Elf32_Sym *sym,
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FAR const struct symtab_s *exports, int nexports);
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/****************************************************************************
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* Name: mod_freebuffers
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*
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* Description:
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* Release all working buffers.
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*
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* Returned Value:
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* 0 (OK) is returned on success and a negated errno is returned on
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* failure.
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*
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****************************************************************************/
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int mod_freebuffers(FAR struct mod_loadinfo_s *loadinfo);
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/****************************************************************************
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* Name: mod_allocbuffer
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*
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* Description:
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* Perform the initial allocation of the I/O buffer, if it has not already
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* been allocated.
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*
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* Returned Value:
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* 0 (OK) is returned on success and a negated errno is returned on
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* failure.
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*
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****************************************************************************/
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int mod_allocbuffer(FAR struct mod_loadinfo_s *loadinfo);
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/****************************************************************************
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* Name: mod_reallocbuffer
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*
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* Description:
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* Increase the size of I/O buffer by the specified buffer increment.
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*
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* Returned Value:
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* 0 (OK) is returned on success and a negated errno is returned on
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* failure.
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*
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****************************************************************************/
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int mod_reallocbuffer(FAR struct mod_loadinfo_s *loadinfo, size_t increment);
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/****************************************************************************
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* Name: mod_findctors
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*
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* Description:
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* Find C++ static constructors.
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*
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* Input Parameters:
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* loadinfo - Load state information
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*
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* Returned Value:
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* 0 (OK) is returned on success and a negated errno is returned on
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* failure.
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*
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****************************************************************************/
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#ifdef CONFIG_BINFMT_CONSTRUCTORS
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int mod_loadctors(FAR struct mod_loadinfo_s *loadinfo);
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#endif
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/****************************************************************************
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* Name: mod_loaddtors
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*
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* Description:
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* Load pointers to static destructors into an in-memory array.
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*
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* Input Parameters:
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* loadinfo - Load state information
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*
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* Returned Value:
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* 0 (OK) is returned on success and a negated errno is returned on
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* failure.
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*
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****************************************************************************/
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#ifdef CONFIG_BINFMT_CONSTRUCTORS
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int mod_loaddtors(FAR struct mod_loadinfo_s *loadinfo);
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#endif
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#endif /* __BINFMT_LIBELF_LIBELF_H */
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