447 lines
15 KiB
C
447 lines
15 KiB
C
/****************************************************************************
|
|
* sched/module/module.h
|
|
*
|
|
* Copyright (C) 2015, 2017 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 __SCHED_MODULE_MODULE_H
|
|
#define __SCHED_MODULE_MODULE_H
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <sys/types.h>
|
|
#include <elf32.h>
|
|
|
|
#include <nuttx/arch.h>
|
|
#include <nuttx/module.h>
|
|
|
|
/****************************************************************************
|
|
* Public Types
|
|
****************************************************************************/
|
|
|
|
/* This describes the file to be loaded. */
|
|
|
|
struct symtab_s;
|
|
struct module_s
|
|
{
|
|
FAR struct module_s *flink; /* Supports a singly linked list */
|
|
FAR char modulename[MODULENAME_MAX]; /* Module name */
|
|
#if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_FS_PROCFS_EXCLUDE_MODULE)
|
|
mod_initializer_t initializer; /* Module initializer function */
|
|
#endif
|
|
struct mod_info_s modinfo; /* Module information */
|
|
FAR void *alloc; /* Allocated kernel memory */
|
|
#if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_FS_PROCFS_EXCLUDE_MODULE)
|
|
size_t textsize; /* Size of the kernel .text memory allocation */
|
|
size_t datasize; /* Size of the kernel .bss/.data memory allocation */
|
|
#endif
|
|
};
|
|
|
|
/* This struct provides a description of the currently loaded instantiation
|
|
* of the kernel module.
|
|
*/
|
|
|
|
struct mod_loadinfo_s
|
|
{
|
|
/* elfalloc is the base address of the memory that is allocated to hold the
|
|
* module image.
|
|
*
|
|
* The alloc[] array in struct module_s will hold memory that persists after
|
|
* the module has been loaded.
|
|
*/
|
|
|
|
uintptr_t textalloc; /* .text memory allocated when module was loaded */
|
|
uintptr_t datastart; /* Start of.bss/.data memory in .text allocation */
|
|
size_t textsize; /* Size of the module .text memory allocation */
|
|
size_t datasize; /* Size of the module .bss/.data memory allocation */
|
|
off_t filelen; /* Length of the entire module file */
|
|
Elf32_Ehdr ehdr; /* Buffered module file header */
|
|
FAR Elf32_Shdr *shdr; /* Buffered module section headers */
|
|
uint8_t *iobuffer; /* File I/O buffer */
|
|
|
|
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 Data
|
|
****************************************************************************/
|
|
|
|
FAR const struct symtab_s *g_mod_symtab;
|
|
FAR int g_mod_nsymbols;
|
|
|
|
/****************************************************************************
|
|
* Public Function Prototypes
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: mod_initialize
|
|
*
|
|
* Description:
|
|
* This function is called to configure the library to process an kernel
|
|
* module.
|
|
*
|
|
* Returned Value:
|
|
* 0 (OK) is returned on success and a negated errno is returned on
|
|
* failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int mod_initialize(FAR const char *filename,
|
|
FAR struct mod_loadinfo_s *loadinfo);
|
|
|
|
/****************************************************************************
|
|
* Name: mod_uninitialize
|
|
*
|
|
* Description:
|
|
* Releases any resources committed by mod_init(). This essentially
|
|
* undoes the actions of mod_initialize.
|
|
*
|
|
* Returned Value:
|
|
* 0 (OK) is returned on success and a negated errno is returned on
|
|
* failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int mod_uninitialize(FAR struct mod_loadinfo_s *loadinfo);
|
|
|
|
/****************************************************************************
|
|
* Name: mod_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 mod_load(FAR struct mod_loadinfo_s *loadinfo);
|
|
|
|
/****************************************************************************
|
|
* Name: mod_bind
|
|
*
|
|
* Description:
|
|
* Bind the imported symbol names in the loaded module described by
|
|
* 'loadinfo' using the exported symbol values provided by mod_setsymtab().
|
|
*
|
|
* Returned Value:
|
|
* 0 (OK) is returned on success and a negated errno is returned on
|
|
* failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int mod_bind(FAR struct mod_loadinfo_s *loadinfo);
|
|
|
|
/****************************************************************************
|
|
* Name: mod_unload
|
|
*
|
|
* Description:
|
|
* This function unloads the object from memory. This essentially undoes
|
|
* the actions of mod_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 mod_unload(struct mod_loadinfo_s *loadinfo);
|
|
|
|
/****************************************************************************
|
|
* Name: mod_verifyheader
|
|
*
|
|
* Description:
|
|
* Given the header from a possible ELF executable, verify that it is
|
|
* an ELF executable.
|
|
*
|
|
* Returned Value:
|
|
* 0 (OK) is returned on success and a negated errno is returned on
|
|
* failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int mod_verifyheader(FAR const Elf32_Ehdr *header);
|
|
|
|
/****************************************************************************
|
|
* Name: mod_read
|
|
*
|
|
* Description:
|
|
* Read 'readsize' bytes from the object file at 'offset'. The data is
|
|
* read into 'buffer.'
|
|
*
|
|
* Returned Value:
|
|
* 0 (OK) is returned on success and a negated errno is returned on
|
|
* failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int mod_read(FAR struct mod_loadinfo_s *loadinfo, FAR uint8_t *buffer,
|
|
size_t readsize, off_t offset);
|
|
|
|
/****************************************************************************
|
|
* Name: mod_loadshdrs
|
|
*
|
|
* Description:
|
|
* Loads section headers into memory.
|
|
*
|
|
* Returned Value:
|
|
* 0 (OK) is returned on success and a negated errno is returned on
|
|
* failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int mod_loadshdrs(FAR struct mod_loadinfo_s *loadinfo);
|
|
|
|
/****************************************************************************
|
|
* Name: mod_findsection
|
|
*
|
|
* Description:
|
|
* A section by its name.
|
|
*
|
|
* Input Parameters:
|
|
* loadinfo - Load state information
|
|
* sectname - Name of the section to find
|
|
*
|
|
* Returned Value:
|
|
* On success, the index to the section is returned; A negated errno value
|
|
* is returned on failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int mod_findsection(FAR struct mod_loadinfo_s *loadinfo,
|
|
FAR const char *sectname);
|
|
|
|
/****************************************************************************
|
|
* Name: mod_findsymtab
|
|
*
|
|
* Description:
|
|
* Find the symbol table section.
|
|
*
|
|
* Returned Value:
|
|
* 0 (OK) is returned on success and a negated errno is returned on
|
|
* failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int mod_findsymtab(FAR struct mod_loadinfo_s *loadinfo);
|
|
|
|
/****************************************************************************
|
|
* Name: mod_readsym
|
|
*
|
|
* Description:
|
|
* Read the ELFT symbol structure at the specfied index into memory.
|
|
*
|
|
* Input Parameters:
|
|
* loadinfo - Load state information
|
|
* index - Symbol table index
|
|
* sym - Location to return the table entry
|
|
*
|
|
* Returned Value:
|
|
* 0 (OK) is returned on success and a negated errno is returned on
|
|
* failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int mod_readsym(FAR struct mod_loadinfo_s *loadinfo, int index,
|
|
FAR Elf32_Sym *sym);
|
|
|
|
/****************************************************************************
|
|
* Name: mod_symvalue
|
|
*
|
|
* Description:
|
|
* Get the value of a symbol. The updated value of the symbol is returned
|
|
* in the st_value field of the symbol table entry.
|
|
*
|
|
* Input Parameters:
|
|
* loadinfo - Load state information
|
|
* sym - Symbol table entry (value might be undefined)
|
|
*
|
|
* Returned Value:
|
|
* 0 (OK) is returned on success and a negated errno is returned on
|
|
* failure.
|
|
*
|
|
* EINVAL - There is something inconsistent in the symbol table (should only
|
|
* happen if the file is corrupted)
|
|
* ENOSYS - Symbol lies in common
|
|
* ESRCH - Symbol has no name
|
|
* ENOENT - Symbol undefined and not provided via a symbol table
|
|
*
|
|
****************************************************************************/
|
|
|
|
int mod_symvalue(FAR struct mod_loadinfo_s *loadinfo, FAR Elf32_Sym *sym);
|
|
|
|
/****************************************************************************
|
|
* Name: mod_freebuffers
|
|
*
|
|
* Description:
|
|
* Release all working buffers.
|
|
*
|
|
* Returned Value:
|
|
* 0 (OK) is returned on success and a negated errno is returned on
|
|
* failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int mod_freebuffers(FAR struct mod_loadinfo_s *loadinfo);
|
|
|
|
/****************************************************************************
|
|
* Name: mod_allocbuffer
|
|
*
|
|
* Description:
|
|
* Perform the initial allocation of the I/O buffer, if it has not already
|
|
* been allocated.
|
|
*
|
|
* Returned Value:
|
|
* 0 (OK) is returned on success and a negated errno is returned on
|
|
* failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int mod_allocbuffer(FAR struct mod_loadinfo_s *loadinfo);
|
|
|
|
/****************************************************************************
|
|
* Name: mod_reallocbuffer
|
|
*
|
|
* Description:
|
|
* Increase the size of I/O buffer by the specified buffer increment.
|
|
*
|
|
* Returned Value:
|
|
* 0 (OK) is returned on success and a negated errno is returned on
|
|
* failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int mod_reallocbuffer(FAR struct mod_loadinfo_s *loadinfo, size_t increment);
|
|
|
|
/****************************************************************************
|
|
* Name: mod_registry_lock
|
|
*
|
|
* Description:
|
|
* Get exclusive access to the module registry.
|
|
*
|
|
* Input Parameters:
|
|
* None
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
****************************************************************************/
|
|
|
|
void mod_registry_lock(void);
|
|
|
|
/****************************************************************************
|
|
* Name: mod_registry_unlock
|
|
*
|
|
* Description:
|
|
* Relinquish the lock on the module registry
|
|
*
|
|
* Input Parameters:
|
|
* None
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
****************************************************************************/
|
|
|
|
void mod_registry_unlock(void);
|
|
|
|
/****************************************************************************
|
|
* Name: mod_registry_add
|
|
*
|
|
* Description:
|
|
* Add a new entry to the module registry.
|
|
*
|
|
* Input Parameters:
|
|
* modp - The module data structure to be registered.
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* The caller holds the lock on the module registry.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void mod_registry_add(FAR struct module_s *modp);
|
|
|
|
/****************************************************************************
|
|
* Name: mod_registry_del
|
|
*
|
|
* Description:
|
|
* Remove a module entry from the registry
|
|
*
|
|
* Input Parameters:
|
|
* modp - The registry entry to be removed.
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) is returned if the registry entry was deleted. Otherwise,
|
|
* a negated errno value is returned.
|
|
*
|
|
* Assumptions:
|
|
* The caller holds the lock on the module registry.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int mod_registry_del(FAR struct module_s *modp);
|
|
|
|
/****************************************************************************
|
|
* Name: mod_registry_find
|
|
*
|
|
* Description:
|
|
* Find an entry in the module registry using the name of the module.
|
|
*
|
|
* Input Parameters:
|
|
* modulename - The name of the module to be found
|
|
*
|
|
* Returned Value:
|
|
* If the registry entry is found, a pointer to the module entry is
|
|
* returned. NULL is returned if the they entry is not found.
|
|
*
|
|
* Assumptions:
|
|
* The caller holds the lock on the module registry.
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct module_s *mod_registry_find(FAR const char *modulename);
|
|
|
|
#endif /* __SCHED_MODULE_MODULE_H */
|