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/****************************************************************************
* binfmt/libnxflat/libnxflat_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 <string.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/kmalloc.h>
#include "libnxflat.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifndef MIN
# define MIN(x,y) ((x) < (y) ? (x) : (y))
#endif
/****************************************************************************
* Private Constant Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nxflat_addrenv_alloc
*
* Description:
* Allocate data memory for the NXFLAT image. If CONFIG_ARCH_ADDRENV=n,
* memory will be allocated using kmm_zalloc(). If CONFIG_ARCH_ADDRENV-y,
* then memory will be allocated using up_addrenv_create().
*
* Input Parameters:
* loadinfo - Load state information
* envsize - The size (in bytes) of the address environment needed for the
* ELF image.
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int nxflat_addrenv_alloc(FAR struct nxflat_loadinfo_s *loadinfo, size_t envsize)
{
FAR struct dspace_s *dspace;
#ifdef CONFIG_ARCH_ADDRENV
FAR void *vdata;
save_addrenv_t oldenv;
size_t heapsize;
int ret;
#endif
DEBUGASSERT(!loadinfo->dspace);
/* Allocate the struct dspace_s container for the D-Space allocation */
dspace = (FAR struct dspace_s *)kmm_malloc(sizeof(struct dspace_s));
if (dspace == 0)
{
bdbg("ERROR: Failed to allocate DSpace\n");
return -ENOMEM;
}
#ifdef CONFIG_ARCH_ADDRENV
/* Determine the heapsize to allocate. If there is no dynamic stack then
* heapsize must at least as big as the fixed stack size since the stack
* will be allocated from the heap in that case.
*/
#ifdef CONFIG_ARCH_STACK_DYNAMIC
heapsize = ARCH_HEAP_SIZE;
#else
heapsize = MIN(loadinfo->stacksize, ARCH_HEAP_SIZE);
#endif
/* Create a D-Space address environment for the new NXFLAT task */
ret = up_addrenv_create(0, envsize, heapsize, &loadinfo->addrenv);
if (ret < 0)
{
bdbg("ERROR: up_addrenv_create failed: %d\n", ret);
goto errout_with_dspace;
}
/* 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 D-Space region (but only if the address environment has been
* selected.
*/
ret = up_addrenv_vdata(&loadinfo->addrenv, 0, &vdata);
if (ret < 0)
{
bdbg("ERROR: up_addrenv_vdata failed: %d\n", ret);
goto errout_with_addrenv;
}
/* Clear all of the allocated D-Space memory. We have to temporarily
* selected the D-Space address environment to do this.
*/
ret = up_addrenv_select(loadinfo->addrenv, &oldenv);
if (ret < 0)
{
bdbg("ERROR: up_addrenv_select failed: %d\n", ret);
goto errout_with_addrenv;
}
memset(vdata, 0, envsize);
ret = up_addrenv_restore(oldenv);
if (ret < 0)
{
bdbg("ERROR: up_addrenv_restore failed: %d\n", ret);
goto errout_with_addrenv;
}
/* Success... save the fruits of our labor */
loadinfo->dspace = dspace;
dspace->crefs = 1;
dspace->region = (FAR uint8_t *)vdata;
return OK;
errout_with_addrenv:
(void)up_addrenv_destroy(&loadinfo->addrenv);
loadinfo->addrenv = 0;
errout_with_dspace:
kmm_free(dspace);
return ret;
#else
/* Allocate (and zero) memory to hold the ELF image */
dspace->region = (FAR uint8_t *)kumm_zalloc(envsize);
if (!dspace->region)
{
kmm_free(dspace);
return -ENOMEM;
}
loadinfo->dspace = dspace;
dspace->crefs = 1;
return OK;
#endif
}
/****************************************************************************
* Name: nxflat_addrenv_free
*
* Description:
* Release the address environment previously created by
* nxflat_addrenv_create(). 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 nxflat_addrenv_free(FAR struct nxflat_loadinfo_s *loadinfo)
{
FAR struct dspace_s *dspace;
#ifdef CONFIG_ARCH_ADDRENV
int ret;
#endif
DEBUGASSERT(loadinfo);
dspace = loadinfo->dspace;
if (dspace)
{
#ifdef CONFIG_ARCH_ADDRENV
/* Destroy the address environment */
ret = up_addrenv_destroy(loadinfo->addrenv);
if (ret < 0)
{
bdbg("ERROR: up_addrenv_destroy failed: %d\n", ret);
}
loadinfo->addrenv = 0;
#else
/* Free the allocated D-Space region */
if (dspace->region)
{
kumm_free(dspace->region);
}
#endif
/* Now destroy the D-Space container */
DEBUGASSERT(dspace->crefs == 1);
kmm_free(dspace);
loadinfo->dspace = NULL;
}
}
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