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incubator-nuttx/sched/module/mod_insmod.c

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/****************************************************************************
* sched/module/mod_insmod.c
*
* 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <string.h>
#include <elf32.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/kmalloc.h>
#include <nuttx/module.h>
#include <nuttx/lib/modlib.h>
#ifdef CONFIG_MODULE
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifndef MIN
# define MIN(a,b) (a < b ? a : b)
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: mod_dumploadinfo
****************************************************************************/
#if defined(CONFIG_DEBUG_INFO) && defined(CONFIG_DEBUG_BINFMT)
static void mod_dumploadinfo(FAR struct mod_loadinfo_s *loadinfo)
{
int i;
binfo("LOAD_INFO:\n");
binfo(" textalloc: %08lx\n", (long)loadinfo->textalloc);
binfo(" datastart: %08lx\n", (long)loadinfo->datastart);
binfo(" textsize: %ld\n", (long)loadinfo->textsize);
binfo(" datasize: %ld\n", (long)loadinfo->datasize);
binfo(" filelen: %ld\n", (long)loadinfo->filelen);
binfo(" filfd: %d\n", loadinfo->filfd);
binfo(" symtabidx: %d\n", loadinfo->symtabidx);
binfo(" strtabidx: %d\n", loadinfo->strtabidx);
binfo("ELF Header:\n");
binfo(" e_ident: %02x %02x %02x %02x\n",
loadinfo->ehdr.e_ident[0], loadinfo->ehdr.e_ident[1],
loadinfo->ehdr.e_ident[2], loadinfo->ehdr.e_ident[3]);
binfo(" e_type: %04x\n", loadinfo->ehdr.e_type);
binfo(" e_machine: %04x\n", loadinfo->ehdr.e_machine);
binfo(" e_version: %08x\n", loadinfo->ehdr.e_version);
binfo(" e_entry: %08lx\n", (long)loadinfo->ehdr.e_entry);
binfo(" e_phoff: %d\n", loadinfo->ehdr.e_phoff);
binfo(" e_shoff: %d\n", loadinfo->ehdr.e_shoff);
binfo(" e_flags: %08x\n", loadinfo->ehdr.e_flags);
binfo(" e_ehsize: %d\n", loadinfo->ehdr.e_ehsize);
binfo(" e_phentsize: %d\n", loadinfo->ehdr.e_phentsize);
binfo(" e_phnum: %d\n", loadinfo->ehdr.e_phnum);
binfo(" e_shentsize: %d\n", loadinfo->ehdr.e_shentsize);
binfo(" e_shnum: %d\n", loadinfo->ehdr.e_shnum);
binfo(" e_shstrndx: %d\n", loadinfo->ehdr.e_shstrndx);
if (loadinfo->shdr && loadinfo->ehdr.e_shnum > 0)
{
for (i = 0; i < loadinfo->ehdr.e_shnum; i++)
{
FAR Elf32_Shdr *shdr = &loadinfo->shdr[i];
binfo("Sections %d:\n", i);
binfo(" sh_name: %08x\n", shdr->sh_name);
binfo(" sh_type: %08x\n", shdr->sh_type);
binfo(" sh_flags: %08x\n", shdr->sh_flags);
binfo(" sh_addr: %08x\n", shdr->sh_addr);
binfo(" sh_offset: %d\n", shdr->sh_offset);
binfo(" sh_size: %d\n", shdr->sh_size);
binfo(" sh_link: %d\n", shdr->sh_link);
binfo(" sh_info: %d\n", shdr->sh_info);
binfo(" sh_addralign: %d\n", shdr->sh_addralign);
binfo(" sh_entsize: %d\n", shdr->sh_entsize);
}
}
}
#else
# define mod_dumploadinfo(i)
#endif
/****************************************************************************
* Name: mod_dumpinitializer
****************************************************************************/
#ifdef CONFIG_MODLIB_DUMPBUFFER
static void mod_dumpinitializer(mod_initializer_t initializer,
FAR struct mod_loadinfo_s *loadinfo)
{
modlib_dumpbuffer("Initializer code", (FAR const uint8_t *)initializer,
MIN(loadinfo->textsize - loadinfo->ehdr.e_entry, 512));
}
#else
# define mod_dumpinitializer(b,l)
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: insmod
*
* Description:
* Verify that the file is an ELF module binary and, if so, load the
* module into kernel memory and initialize it for use.
*
* NOTE: modlib_setsymtab() had to have been called in board-specific OS
* logic prior to calling this function from application logic (perhaps via
* boardctl(BOARDIOC_OS_SYMTAB). Otherwise, insmod will be unable to
* resolve symbols in the OS module.
*
* Input Parameters:
*
* filename - Full path to the module binary to be loaded
* modname - The name that can be used to refer to the module after
* it has been loaded.
*
* Returned Value:
* A non-NULL module handle that can be used on subsequent calls to other
* module interfaces is returned on success. If insmod() was unable to
* load the module insmod() will return a NULL handle and the errno
* variable will be set appropriately.
*
****************************************************************************/
FAR void *insmod(FAR const char *filename, FAR const char *modname)
{
struct mod_loadinfo_s loadinfo;
FAR struct module_s *modp;
mod_initializer_t initializer;
int ret;
DEBUGASSERT(filename != NULL && modname != NULL);
binfo("Loading file: %s\n", filename);
/* Get exclusive access to the module registry */
modlib_registry_lock();
/* Check if this module is already installed */
if (modlib_registry_find(modname) != NULL)
{
modlib_registry_unlock();
ret = -EEXIST;
goto errout_with_lock;
}
/* Initialize the ELF library to load the program binary. */
ret = modlib_initialize(filename, &loadinfo);
mod_dumploadinfo(&loadinfo);
if (ret != 0)
{
serr("ERROR: Failed to initialize to load module: %d\n", ret);
goto errout_with_lock;
}
/* Allocate a module registry entry to hold the module data */
modp = (FAR struct module_s *)kmm_zalloc(sizeof(struct module_s));
if (ret != 0)
{
binfo("Failed to initialize for load of ELF program: %d\n", ret);
goto errout_with_loadinfo;
}
/* Save the module name in the registry entry */
strncpy(modp->modname, modname, MODLIB_NAMEMAX);
/* Load the program binary */
ret = modlib_load(&loadinfo);
mod_dumploadinfo(&loadinfo);
if (ret != 0)
{
binfo("Failed to load ELF program binary: %d\n", ret);
goto errout_with_registry_entry;
}
/* Bind the program to the kernel symbol table */
ret = modlib_bind(modp, &loadinfo);
if (ret != 0)
{
binfo("Failed to bind symbols program binary: %d\n", ret);
goto errout_with_load;
}
/* Save the load information */
modp->alloc = (FAR void *)loadinfo.textalloc;
#if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_FS_PROCFS_EXCLUDE_MODULE)
modp->textsize = loadinfo.textsize;
modp->datasize = loadinfo.datasize;
#endif
/* Get the module initializer entry point */
initializer = (mod_initializer_t)(loadinfo.textalloc + loadinfo.ehdr.e_entry);
#if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_FS_PROCFS_EXCLUDE_MODULE)
modp->initializer = initializer;
#endif
mod_dumpinitializer(initializer, &loadinfo);
/* Call the module initializer */
ret = initializer(&modp->modinfo);
if (ret < 0)
{
binfo("Failed to initialize the module: %d\n", ret);
goto errout_with_load;
}
/* Add the new module entry to the registry */
modlib_registry_add(modp);
modlib_uninitialize(&loadinfo);
modlib_registry_unlock();
return (FAR void *)modp;
errout_with_load:
modlib_unload(&loadinfo);
(void)modlib_undepend(modp);
errout_with_registry_entry:
kmm_free(modp);
errout_with_loadinfo:
modlib_uninitialize(&loadinfo);
errout_with_lock:
modlib_registry_unlock();
set_errno(-ret);
return NULL;
}
#endif /* CONFIG_MODULE */
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