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/****************************************************************************
* binfmt/libelf/libelf_addrenv.c
*
* Copyright (C) 2012 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 <errno.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/kmalloc.h>
#include "libelf.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Constant Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: elf_addrenv_alloc
*
* Description:
* Allocate memory for the ELF image (textalloc and dataalloc). If
* CONFIG_ARCH_ADDRENV=n, textalloc will be allocated using kmm_zalloc() and
* dataalloc will be a offset from textalloc. If CONFIG_ARCH_ADDRENV-y, then
* textalloc and dataalloc will be allocated using up_addrenv_create(). In
* either case, there will be a unique instance of textalloc and dataalloc
* (and stack) for each instance of a process.
*
* Input Parameters:
* loadinfo - Load state information
* textsize - The size (in bytes) of the .text address environment needed
* for the ELF image (read/execute).
* datasize - The size (in bytes) of the .bss/.data address environment
* needed for the ELF image (read/write).
* heapsize - The initial size (in bytes) of the heap address environment
* needed by the task. This region may be read/write only.
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int elf_addrenv_alloc(FAR struct elf_loadinfo_s *loadinfo, size_t textsize,
size_t datasize, size_t heapsize)
{
#ifdef CONFIG_ARCH_ADDRENV
FAR void *vtext;
FAR void *vdata;
int ret;
/* Create an address environment for the new ELF task */
ret = up_addrenv_create(textsize, datasize, heapsize, &loadinfo->addrenv);
if (ret < 0)
{
bdbg("ERROR: up_addrenv_create failed: %d\n", ret);
return ret;
}
/* Get the virtual address associated with the start of the address
* environment. This is the base address that we will need to use to
* access the ELF image (but only if the address environment has been
* selected.
*/
ret = up_addrenv_vtext(&loadinfo->addrenv, &vtext);
if (ret < 0)
{
bdbg("ERROR: up_addrenv_vtext failed: %d\n", ret);
return ret;
}
ret = up_addrenv_vdata(&loadinfo->addrenv, textsize, &vdata);
if (ret < 0)
{
bdbg("ERROR: up_adup_addrenv_vdatadrenv_vtext failed: %d\n", ret);
return ret;
}
loadinfo->textalloc = (uintptr_t)vtext;
loadinfo->dataalloc = (uintptr_t)vdata;
return OK;
#else
/* Allocate memory to hold the ELF image */
loadinfo->textalloc = (uintptr_t)kumm_zalloc(textsize + datasize);
if (!loadinfo->textalloc)
{
return -ENOMEM;
}
loadinfo->dataalloc = loadinfo->textalloc + textsize;
return OK;
#endif
}
/****************************************************************************
* Name: elf_addrenv_free
*
* Description:
* Release the address environment previously created by
* elf_addrenv_alloc(). This function is called only under certain error
* conditions after the module has been loaded but not yet started.
* After the module has been started, the address environment will
* automatically be freed when the module exits.
*
* Input Parameters:
* loadinfo - Load state information
*
* Returned Value:
* None.
*
****************************************************************************/
void elf_addrenv_free(FAR struct elf_loadinfo_s *loadinfo)
{
#ifdef CONFIG_ARCH_ADDRENV
int ret;
/* Free the address environment */
ret = up_addrenv_destroy(&loadinfo->addrenv);
if (ret < 0)
{
bdbg("ERROR: up_addrenv_destroy failed: %d\n", ret);
}
#else
/* If there is an allocation for the ELF image, free it */
if (loadinfo->textalloc != 0)
{
kumm_free((FAR void *)loadinfo->textalloc);
}
#endif
/* Clear out all indications of the allocated address environment */
loadinfo->textalloc = 0;
loadinfo->dataalloc = 0;
loadinfo->textsize = 0;
loadinfo->datasize = 0;
}
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