forked from Archive/PX4-Autopilot
236 lines
7.1 KiB
C
236 lines
7.1 KiB
C
/****************************************************************************
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* binfmt/libnxflat/libnxflat_addrenv.c
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*
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* Copyright (C) 2012 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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <string.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <nuttx/kmalloc.h>
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#include "libnxflat.h"
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/****************************************************************************
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* Pre-Processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Constant Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxflat_addrenv_alloc
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*
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* Description:
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* Allocate memory for the ELF image (elfalloc). If CONFIG_ADDRENV=n,
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* elfalloc will be allocated using kzalloc(). If CONFIG_ADDRENV-y, then
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* elfalloc will be allocated using up_addrenv_create(). In either case,
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* there will be a unique instance of elfalloc (and stack) for each
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* instance of a process.
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*
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* Input Parameters:
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* loadinfo - Load state information
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* envsize - The size (in bytes) of the address environment needed for the
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* ELF image.
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int nxflat_addrenv_alloc(FAR struct nxflat_loadinfo_s *loadinfo, size_t envsize)
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{
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FAR struct dspace_s *dspace;
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#ifdef CONFIG_ADDRENV
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FAR void *vaddr;
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hw_addrenv_t oldenv;
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int ret;
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#endif
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DEBUGASSERT(!loadinfo->dspace);
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/* Allocate the struct dspace_s container for the D-Space allocation */
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dspace = (FAR struct dspace_s *)kmalloc(sizeof(struct dspace_s));
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if (dspace == 0)
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{
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bdbg("ERROR: Failed to allocate DSpace\n");
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return -ENOMEM;
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}
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#ifdef CONFIG_ADDRENV
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/* Create a D-Space address environment for the new NXFLAT task */
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ret = up_addrenv_create(envsize, &loadinfo->addrenv);
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if (ret < 0)
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{
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bdbg("ERROR: up_addrenv_create failed: %d\n", ret);
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goto errout_with_dspace;
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}
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/* Get the virtual address associated with the start of the address
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* environment. This is the base address that we will need to use to
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* access the D-Space region (but only if the address environment has been
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* selected.
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*/
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ret = up_addrenv_vaddr(loadinfo->addrenv, &vaddr);
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if (ret < 0)
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{
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bdbg("ERROR: up_addrenv_vaddr failed: %d\n", ret);
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goto errout_with_addrenv;
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}
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/* Clear all of the allocated D-Space memory. We have to temporarily
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* selected the D-Space address environment to do this.
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*/
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ret = up_addrenv_select(loadinfo->addrenv, &oldenv);
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if (ret < 0)
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{
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bdbg("ERROR: up_addrenv_select failed: %d\n", ret);
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goto errout_with_addrenv;
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}
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memset(vaddr, 0, envsize);
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ret = up_addrenv_restore(oldenv);
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if (ret < 0)
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{
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bdbg("ERROR: up_addrenv_restore failed: %d\n", ret);
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goto errout_with_addrenv;
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}
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/* Success... save the fruits of our labor */
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loadinfo->dspace = dspace;
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dspace->crefs = 1;
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dspace->region = (FAR uint8_t *)vaddr;
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return OK;
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errout_with_addrenv:
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(void)up_addrenv_destroy(loadinfo->addrenv);
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loadinfo->addrenv = 0;
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errout_with_dspace:
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kfree(dspace);
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return ret;
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#else
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/* Allocate (and zero) memory to hold the ELF image */
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dspace->region = (FAR uint8_t *)kzalloc(envsize);
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if (!dspace->region)
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{
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kfree(dspace);
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return -ENOMEM;
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}
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loadinfo->dspace = dspace;
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dspace->crefs = 1;
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return OK;
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#endif
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}
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/****************************************************************************
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* Name: nxflat_addrenv_free
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*
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* Description:
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* Release the address environment previously created by
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* nxflat_addrenv_create(). This function is called only under certain
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* error conditions after the the module has been loaded but not yet
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* started. After the module has been started, the address environment
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* will automatically be freed when the module exits.
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*
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* Input Parameters:
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* loadinfo - Load state information
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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 nxflat_addrenv_free(FAR struct nxflat_loadinfo_s *loadinfo)
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{
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FAR struct dspace_s *dspace;
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#ifdef CONFIG_ADDRENV
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int ret;
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#endif
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DEBUGASSERT(loadinfo);
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dspace = loadinfo->dspace;
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if (dspace)
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{
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#ifdef CONFIG_ADDRENV
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/* Destroy the address environment */
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ret = up_addrenv_destroy(loadinfo->addrenv);
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if (ret < 0)
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{
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bdbg("ERROR: up_addrenv_destroy failed: %d\n", ret);
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}
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loadinfo->addrenv = 0;
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#else
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/* Free the allocated D-Space region */
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if (dspace->region)
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{
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kfree(dspace->region);
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}
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#endif
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/* Now destroy the D-Space container */
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DEBUGASSERT(dspace->crefs == 1);
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kfree(dspace);
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loadinfo->dspace = NULL;
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}
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}
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