208 lines
7.3 KiB
C
208 lines
7.3 KiB
C
/****************************************************************************
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* binfmt/libnxflat/libnxflat_load.c
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*
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* Copyright (C) 2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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 <sys/types.h>
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#include <sys/mman.h>
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#include <stdlib.h>
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#include <nxflat.h>
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#include <debug.h>
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#include <errno.h>
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#include <arpa/inet.h>
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#include <nuttx/nxflat.h>
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/****************************************************************************
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* Pre-Processor Definitions
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****************************************************************************/
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#ifndef MAX
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#define MAX(x,y) ((x) > (y) ? (x) : (y))
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#endif
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/****************************************************************************
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* Private Constant Data
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****************************************************************************/
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#if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_BINFMT)
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static const char g_relocrel32i[] = "RELOC_REL32I";
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static const char g_relocrel32d[] = "RELOC_REL32D";
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static const char g_relocabs32[] = "RELOC_AB32";
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static const char g_undefined[] = "UNDEFINED";
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static const char *g_reloctype[] =
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{
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g_relocrel32i,
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g_relocrel32d,
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g_relocabs32,
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g_undefined
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};
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# define RELONAME(rl) g_reloctype[NXFLAT_RELOC_TYPE(rl)]
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#else
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# define RELONAME(rl) "(no name)"
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#endif
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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_load
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*
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* Description:
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* Loads the binary specified by nxflat_init into memory, mapping
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* the I-space executable regions, allocating the D-Space region,
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* and inializing the data segment (relocation information is
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* temporarily loaded into the BSS region. BSS will be cleared
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* by nxflat_bind() after the relocation data has been processed).
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*
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* Returned Value:
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* 0 (OK) is returned on success and a negated errno is returned on
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* failure.
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*
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****************************************************************************/
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int nxflat_load(struct nxflat_loadinfo_s *loadinfo)
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{
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off_t doffset; /* Offset to .data in the NXFLAT file */
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uint32 dreadsize; /* Total number of bytes of .data to be read */
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uint32 relocsize; /* Memory needed to hold relocations */
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uint32 extrasize; /* MAX(BSS size, relocsize) */
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int ret = OK;
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/* Calculate the extra space we need to allocate. This extra space will be
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* the size of the BSS section. This extra space will also be used
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* temporarily to hold relocation information. So the allocated size of this
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* region will either be the size of .data + size of.bss section OR, the
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* size of .data + the relocation entries, whichever is larger
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*
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* This is the amount of memory that we have to have to hold the
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* relocations.
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*/
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relocsize = loadinfo->reloccount * sizeof(struct nxflat_reloc_s);
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/* In the file, the relocations should lie at the same offset as BSS.
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* The additional amount that we allocate have to be either (1) the
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* BSS size, or (2) the size of the relocation records, whicher is
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* larger.
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*/
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extrasize = MAX(loadinfo->bsssize, relocsize);
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/* Use this additional amount to adjust the total size of the dspace
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* region.
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*/
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loadinfo->dsize = loadinfo->datasize + extrasize;
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/* The number of bytes of data that we have to read from the file is
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* the data size plus the size of the relocation table.
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*/
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dreadsize = loadinfo->datasize + relocsize;
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/* We'll need this a few times. */
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doffset = loadinfo->isize;
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/* We will make two mmap calls create an address space for the executable.
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* We will attempt to map the file to get the ISpace address space and
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* to allocate RAM to get the DSpace address space. If the filesystem does
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* not support file mapping, the map() implementation should do the
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* right thing.
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*/
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/* The following call will give as a pointer to the mapped file ISpace.
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* This may be in ROM, RAM, Flash, ... We don't really care where the memory
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* resides as long as it is fully initialized and ready to execute.
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*/
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loadinfo->ispace = (uint32)mmap(NULL, loadinfo->isize, PROT_READ,
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MAP_SHARED|MAP_FILE, loadinfo->filfd, 0);
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if (loadinfo->ispace == (uint32)MAP_FAILED)
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{
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bdbg("Failed to map NXFLAT ISpace: %d\n", errno);
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return -errno;
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}
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bvdbg("Mapped ISpace (%d bytes) at %08x\n", loadinfo->isize, loadinfo->ispace);
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/* The following call will give a pointer to the allocated but
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* uninitialized ISpace memory.
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*/
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loadinfo->dspace = (struct dspace_s *)malloc(SIZEOF_DSPACE_S(loadinfo->dsize));
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if (loadinfo->dspace == 0)
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{
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bdbg("Failed to allocate DSpace\n");
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ret = -ENOMEM;
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goto errout;
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}
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loadinfo->dspace->crefs = 1;
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bvdbg("Allocated DSpace (%d bytes) at %p\n", loadinfo->dsize, loadinfo->dspace->region);
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/* Now, read the data into allocated DSpace at doffset into the
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* allocated DSpace memory.
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*/
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ret = nxflat_read(loadinfo, (char*)loadinfo->dspace->region, dreadsize, doffset);
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if (ret < 0)
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{
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bdbg("Failed to read .data section: %d\n", ret);
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goto errout;
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}
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bvdbg("TEXT: %08x Entry point offset: %08x Data offset: %08x\n",
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loadinfo->ispace, loadinfo->entryoffs, doffset);
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return OK;
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errout:
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(void)nxflat_unload(loadinfo);
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return ret;
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}
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