468 lines
15 KiB
C
468 lines
15 KiB
C
/****************************************************************************
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* sched/module/module.h
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*
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* Copyright (C) 2015, 2017 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 __SCHED_MODULE_MODULE_H
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#define __SCHED_MODULE_MODULE_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/module.h>
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* This describes the file to be loaded. */
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struct symtab_s;
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struct module_s
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{
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FAR struct module_s *flink; /* Supports a singly linked list */
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FAR char modulename[MODULENAME_MAX]; /* Module name */
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#if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_FS_PROCFS_EXCLUDE_MODULE)
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mod_initializer_t initializer; /* Module initializer function */
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#endif
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struct mod_info_s modinfo; /* Module information */
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FAR void *alloc; /* Allocated kernel memory */
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#if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_FS_PROCFS_EXCLUDE_MODULE)
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size_t textsize; /* Size of the kernel .text memory allocation */
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size_t datasize; /* Size of the kernel .bss/.data memory allocation */
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#endif
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};
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/* This struct provides a description of the currently loaded instantiation
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* of the kernel module.
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*/
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struct mod_loadinfo_s
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{
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/* elfalloc is the base address of the memory that is allocated to hold the
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* module image.
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*
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* The alloc[] array in struct module_s will hold memory that persists after
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* the module has been loaded.
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*/
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uintptr_t textalloc; /* .text memory allocated when module was loaded */
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uintptr_t datastart; /* Start of.bss/.data memory in .text allocation */
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size_t textsize; /* Size of the module .text memory allocation */
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size_t datasize; /* Size of the module .bss/.data memory allocation */
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off_t filelen; /* Length of the entire module file */
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Elf32_Ehdr ehdr; /* Buffered module file header */
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FAR Elf32_Shdr *shdr; /* Buffered module section headers */
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uint8_t *iobuffer; /* File I/O buffer */
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uint16_t symtabidx; /* Symbol table section index */
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uint16_t strtabidx; /* String table section index */
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uint16_t buflen; /* size of iobuffer[] */
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int filfd; /* Descriptor for the file being loaded */
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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FAR const struct symtab_s *g_mod_symtab;
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FAR int g_mod_nsymbols;
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: mod_initialize
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*
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* Description:
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* This function is called to configure the library to process an kernel
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* module.
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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_initialize(FAR const char *filename,
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FAR struct mod_loadinfo_s *loadinfo);
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/****************************************************************************
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* Name: mod_uninitialize
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*
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* Description:
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* Releases any resources committed by mod_init(). This essentially
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* undoes the actions of mod_initialize.
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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_uninitialize(FAR struct mod_loadinfo_s *loadinfo);
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/****************************************************************************
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* Name: mod_load
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*
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* Description:
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* Loads the binary into memory, allocating memory, performing relocations
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* and initializing the data and bss segments.
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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_load(FAR struct mod_loadinfo_s *loadinfo);
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/****************************************************************************
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* Name: mod_bind
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*
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* Description:
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* Bind the imported symbol names in the loaded module described by
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* 'loadinfo' using the exported symbol values provided by mod_setsymtab().
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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_bind(FAR struct mod_loadinfo_s *loadinfo);
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/****************************************************************************
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* Name: mod_unload
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*
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* Description:
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* This function unloads the object from memory. This essentially undoes
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* the actions of mod_load. It is called only under certain error
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* conditions after the module has been loaded but not yet started.
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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_unload(struct mod_loadinfo_s *loadinfo);
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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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*
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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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/****************************************************************************
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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_registry_lock
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*
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* Description:
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* Get exclusive access to the module registry.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void mod_registry_lock(void);
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/****************************************************************************
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* Name: mod_registry_unlock
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*
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* Description:
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* Relinquish the lock on the module registry
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void mod_registry_unlock(void);
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/****************************************************************************
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* Name: mod_registry_add
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*
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* Description:
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* Add a new entry to the module registry.
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*
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* Input Parameters:
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* modp - The module data structure to be registered.
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* The caller holds the lock on the module registry.
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*
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****************************************************************************/
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void mod_registry_add(FAR struct module_s *modp);
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/****************************************************************************
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* Name: mod_registry_del
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*
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* Description:
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* Remove a module entry from the registry
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*
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* Input Parameters:
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* modp - The registry entry to be removed.
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*
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* Returned Value:
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* Zero (OK) is returned if the registry entry was deleted. Otherwise,
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* a negated errno value is returned.
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*
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* Assumptions:
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* The caller holds the lock on the module registry.
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*
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****************************************************************************/
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int mod_registry_del(FAR struct module_s *modp);
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/****************************************************************************
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* Name: mod_registry_find
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*
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* Description:
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* Find an entry in the module registry using the name of the module.
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*
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* Input Parameters:
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* modulename - The name of the module to be found
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*
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* Returned Value:
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* If the registry entry is found, a pointer to the module entry is
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* returned. NULL is returned if the they entry is not found.
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*
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* Assumptions:
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* The caller holds the lock on the module registry.
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*
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****************************************************************************/
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FAR struct module_s *mod_registry_find(FAR const char *modulename);
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/****************************************************************************
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* Name: mod_registry_verify
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*
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* Description:
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* Verify that a module handle is valid by traversing the module list and
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* assuring that the module still resides in the list. If it does not,
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* the handle is probably a stale pointer.
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*
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* Input Parameters:
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* modp - The registry entry to be verified.
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*
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* Returned Value:
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* Returns OK is the module is valid; -ENOENT otherwise.
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*
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* Assumptions:
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* The caller holds the lock on the module registry.
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*
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****************************************************************************/
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int mod_registry_verify(FAR struct module_s *modp);
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#endif /* __SCHED_MODULE_MODULE_H */
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