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235 lines
7.1 KiB
235 lines
7.1 KiB
/**************************************************************************** |
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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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