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Add NXFLAT dynamic binding logic

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1919 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
2009-06-21 13:41:39 +00:00
parent 57deccf919
commit f99eb7d89b
7 changed files with 227 additions and 16 deletions
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binfmt/binfmt_loadmodule.c
+4 -4
View File
@@ -74,7 +74,8 @@
* Name: load_module
*
* Description:
* Load a module into memory and prep it for execution.
* Load a module into memory, bind it to an exported symbol take, and
* prep the module for execution.
*
* Returned Value:
* This is an end-user function, so it follows the normal convention:
@@ -83,7 +84,7 @@
*
****************************************************************************/
int load_module(const char *filename, FAR struct binary_s *bin)
int load_module(FAR struct binary_s *bin)
{
FAR struct binfmt_s *binfmt;
int ret;
@@ -96,7 +97,7 @@ int load_module(const char *filename, FAR struct binary_s *bin)
else
#endif
{
bdbg("Loading %s\n", filename);
bdbg("Loading %s\n", bin->filename);
/* Disabling pre-emption should be sufficient protection while
* accessing the list of registered binary format handlers.
@@ -116,7 +117,6 @@ int load_module(const char *filename, FAR struct binary_s *bin)
ret = binfmt->load(bin);
if (ret == OK)
{
/* Successfully loaded -- break out with ret == 0 */
dump_module(bin);
binfmt/libnxflat/Make.defs
+2 -1
View File
@@ -35,4 +35,5 @@
LIBNXFLAT_ASRCS =
LIBNXFLAT_CSRCS = libnxflat_init.c libnxflat_uninit.c libnxflat_load.c \
libnxflat_unload.c libnxflat_verify.c libnxflat_read.c
libnxflat_unload.c libnxflat_verify.c libnxflat_read.c \
libnxflat_bind.c
binfmt/libnxflat/libnxflat_bind.c
+172
View File
@@ -0,0 +1,172 @@
/****************************************************************************
* binfmt/libnxflat/libnxflat_bind.c
*
* Copyright (C) 2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 <sys/types.h>
#include <nxflat.h>
#include <errno.h>
#include <assert.h>
#include <debug.h>
#include <arpa/inet.h>
#include <nuttx/nxflat.h>
#include <nuttx/symtab.h>
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/***********************************************************************
* Name: nxflat_bind
*
* Description:
* Bind the imported symbol names in the loaded module described by
* 'loadinfo' using the exported symbol values provided by 'symtab'
*
* Returned Value:
* 0 (OK) is returned on success and a negated errno is returned on
* failure.
*
***********************************************************************/
int nxflat_bind(FAR struct nxflat_loadinfo_s *loadinfo,
FAR const struct symtab_s *exports, int nexports)
{
FAR struct nxflat_import_s *imports;
FAR struct nxflat_hdr_s *hdr;
FAR const struct symtab_s *symbol;
char *symname;
uint32 offset;
uint16 nimports;
int i;
/* Get the ISpace load address of the module. The NXFLAT header is the
* first thing at the beginning of the ISpace.
*/
hdr = (FAR struct nxflat_hdr_s*)loadinfo->ispace;
/* From this, we can get the offset to the list of symbols imported by
* this module and the number of symbols imported by this module.
*/
offset = ntohl(hdr->h_importsymbols);
nimports = ntohs(hdr->h_importcount);
/* Verify that this module requires imported symbols */
if (offset != 0 && nimports > 0)
{
/* It does.. make sure that exported symbols are provided */
DEBUGASSERT(symtab && nexports > 0);
/* If non-zero, the value of the imported symbol list that we get
* from the header is a file offset. We will have to convert this
* to an offset into the DSpace segment to get the pointer to the
* beginning of the imported symbol list.
*/
DEBUGASSERT(offset >= loadinfo->isize &&
offset < loadinfo->isize + loadinfo->dsize);
imports = (struct nxflat_import_s*)
(offset - loadinfo->isize + loadinfo->dspace);
/* Now, search the list of imported symbols and attempt to bind
* each symbol to the value exported by from the exported symbol
* table.
*/
for (i = 0; i < nimports; i++)
{
/* Get a pointer to the imported symbol name. The name itself
* lies in the TEXT segment. But the reference to the name
* lies in DATA segment. Therefore, the name reference should
* have been relocated when the module was loaded.
*/
offset = imports[i].i_funcname;
DEBUGASSERT(offset < loadinfo->isize);
symname = (char*)(offset + loadinfo->ispace);
/* Find the exported symbol value for this this symbol name. */
#ifdef CONFIG_SYMTAB_ORDEREDBYNAME
symbol = symtab_findorderedbyname(exports, symname, nexports);
#else
symbol = symtab_findbyname(exports, symname, nexports);
#endif
if (!symbol)
{
bdbg("Exported symbol \"%s\" not found\n", symname);
return -ENOENT;
}
/* And put this into the module's import structure. */
imports[i].i_funcaddress = (uint32)symbol->sym_value;
bvdbg("Bound imported function '%s' to address %08x\n",
symname, imports[i].function_address);
}
}
return OK;
}
binfmt/nxflat.c
+10
View File
@@ -173,6 +173,16 @@ static int nxflat_loadbinary(struct binary_s *binp)
return ret;
}
/* Bind the program to the exported symbol table */
ret = nxflat_bind(&loadinfo, binp->exports, binp->nexports);
if (ret != 0)
{
bdbg("Failed to bind symbols program binary: %d\n", ret);
nxflat_uninit(&loadinfo);
return ret;
}
/* Return the load information */
binp->entrypt = (main_t)(loadinfo.ispace + loadinfo.entryoffs);