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incubator-nuttx/binfmt/libnxflat/libnxflat_bind.c

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/****************************************************************************
* 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 <string.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>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* CONFIG_DEBUG, CONFIG_DEBUG_VERBOSE, and CONFIG_DEBUG_BINFMT have to be
* defined or CONFIG_NXFLAT_DUMPBUFFER does nothing.
*/
#if !defined(CONFIG_DEBUG_VERBOSE) || !defined (CONFIG_DEBUG_BINFMT)
# undef CONFIG_NXFLAT_DUMPBUFFER
#endif
#ifdef CONFIG_NXFLAT_DUMPBUFFER
# define nxflat_dumpbuffer(m,b,n) bvdbgdumpbuffer(m,b,n)
#else
# define nxflat_dumpbuffer(m,b,n)
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: nxflat_bindrel32i
*
* Description:
* Perform the NXFLAT_RELOC_TYPE_REL32I binding:
*
* Meaning: Object file contains a 32-bit offset into I-Space at the offset.
* Fixup: Add mapped I-Space address to the offset.
*
* Returned Value:
* 0 (OK) is returned on success and a negated errno is returned on
* failure.
*
****************************************************************************/
static inline int nxflat_bindrel32i(FAR struct nxflat_loadinfo_s *loadinfo,
uint32 offset)
{
uint32 *addr;
bvdbg("NXFLAT_RELOC_TYPE_REL32I Offset: %08x I-Space: %p\n",
offset, loadinfo->ispace + sizeof(struct nxflat_hdr_s));
if (offset < loadinfo->dsize)
{
addr = (uint32*)(offset + loadinfo->dspace->region);
bvdbg(" Before: %08x\n", *addr);
*addr += (uint32)(loadinfo->ispace + sizeof(struct nxflat_hdr_s));
bvdbg(" After: %08x\n", *addr);
return OK;
}
else
{
bdbg("Offset: %08 does not lie in D-Space size: %08x\n",
offset, loadinfo->dsize);
return -EINVAL;
}
}
/****************************************************************************
* Name: nxflat_bindrel32d
*
* Description:
* Perform the NXFLAT_RELOC_TYPE_REL32D binding:
*
* Meaning: Object file contains a 32-bit offset into D-Space at the offset.
* Fixup: Add allocated D-Space address to the offset.
*
* Returned Value:
* 0 (OK) is returned on success and a negated errno is returned on
* failure.
*
****************************************************************************/
static inline int nxflat_bindrel32d(FAR struct nxflat_loadinfo_s *loadinfo,
uint32 offset)
{
uint32 *addr;
bvdbg("NXFLAT_RELOC_TYPE_REL32D Offset: %08x D-Space: %p\n",
offset, loadinfo->dspace->region);
if (offset < loadinfo->dsize)
{
addr = (uint32*)(offset + loadinfo->dspace->region);
bvdbg(" Before: %08x\n", *addr);
*addr += (uint32)(loadinfo->dspace->region);
bvdbg(" After: %08x\n", *addr);
return OK;
}
else
{
bdbg("Offset: %08 does not lie in D-Space size: %08x\n",
offset, loadinfo->dsize);
return -EINVAL;
}
}
/****************************************************************************
* Name: nxflat_bindrel32id
*
* Description:
* Perform the NXFLAT_RELOC_TYPE_REL32ID binding:
*
* Meaning: Object file contains a 32-bit offset into I-Space at the offset
* that will unfortunately be references relative to the GOT
* Fixup: Add allocated the mapped I-Space address MINUS the allocated
* D-Space address to the offset.
*
* Returned Value:
* 0 (OK) is returned on success and a negated errno is returned on
* failure.
*
****************************************************************************/
#ifdef NXFLAT_RELOC_TYPE_REL32ID
static inline int nxflat_bindrel32id(FAR struct nxflat_loadinfo_s *loadinfo,
uint32 offset)
{
uint32 *addr;
bvdbg("NXFLAT_RELOC_TYPE_REL32D Offset: %08x D-Space: %p\n",
offset, loadinfo->dspace->region);
if (offset < loadinfo->dsize)
{
addr = (uint32*)(offset + loadinfo->dspace->region);
bvdbg(" Before: %08x\n", *addr);
*addr += ((uint32)loadinfo->ispace - (uint32)(loadinfo->dspace->region));
bvdbg(" After: %08x\n", *addr);
return OK;
}
else
{
bdbg("Offset: %08 does not lie in D-Space size: %08x\n",
offset, loadinfo->dsize);
return -EINVAL;
}
}
#endif
/****************************************************************************
* Name: nxflat_gotrelocs
*
* Description:
* Bind all of the GOT relocations in the loaded module described by
* 'loadinfo'
*
* Returned Value:
* 0 (OK) is returned on success and a negated errno is returned on
* failure.
*
****************************************************************************/
static inline int nxflat_gotrelocs(FAR struct nxflat_loadinfo_s *loadinfo)
{
FAR struct nxflat_reloc_s *relocs;
FAR struct nxflat_reloc_s reloc;
FAR struct nxflat_hdr_s *hdr;
uint32 offset;
uint16 nrelocs;
int ret;
int result;
int i;
/* 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 list of relocation entries. */
/* From this, we can get the offset to the list of relocation entries */
offset = ntohl(hdr->h_relocstart);
nrelocs = ntohs(hdr->h_reloccount);
bvdbg("offset: %08lx nrelocs: %d\n", (long)offset, nrelocs);
/* The value of the relocation 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 relocation
* list.
*/
DEBUGASSERT(offset >= loadinfo->isize);
DEBUGASSERT(offset + nrelocs * sizeof(struct nxflat_reloc_s)
<= (loadinfo->isize + loadinfo->dsize));
relocs = (FAR struct nxflat_reloc_s*)
(offset - loadinfo->isize + loadinfo->dspace->region);
bvdbg("isize: %08lx dpsace: %p relocs: %p\n",
(long)loadinfo->isize, loadinfo->dspace->region, relocs);
/* Now, traverse the relocation list of and bind each GOT relocation. */
ret = OK; /* Assume success */
for (i = 0; i < nrelocs; i++)
{
/* Handle the relocation by the relocation type */
reloc = *relocs++;
result = OK;
switch (NXFLAT_RELOC_TYPE(reloc.r_info))
{
/* NXFLAT_RELOC_TYPE_REL32I Meaning: Object file contains a 32-bit offset
* into I-Space at the offset.
* Fixup: Add mapped I-Space address to the offset.
*/
case NXFLAT_RELOC_TYPE_REL32I:
{
result = nxflat_bindrel32i(loadinfo, NXFLAT_RELOC_OFFSET(reloc.r_info));
}
break;
/* NXFLAT_RELOC_TYPE_REL32D Meaning: Object file contains a 32-bit offset
* into D-Space at the offset.
* Fixup: Add allocated D-Space address to the
* offset.
*/
case NXFLAT_RELOC_TYPE_REL32D:
{
result = nxflat_bindrel32d(loadinfo, NXFLAT_RELOC_OFFSET(reloc.r_info));
}
break;
/* NXFLAT_RELOC_TYPE_REL32ID Meaning: Object file contains a 32-bit offset
* into I-Space at the offset that will
* unfortunately be references relative
* to the GOT
* Fixup: Add allocated the mapped I-Space
* address MINUS the allocated D-Space
* address to the offset.
*/
#ifdef NXFLAT_RELOC_TYPE_REL32ID
case NXFLAT_RELOC_TYPE_REL32ID:
{
result = nxflat_bindrel32id(loadinfo, NXFLAT_RELOC_OFFSET(reloc.r_info));
}
break;
#endif
default:
{
bdbg("ERROR: Unrecognized relocation type: %d\n", NXFLAT_RELOC_TYPE(reloc.r_info));
result = -EINVAL;
}
break;
}
/* Check for failures */
if (result < 0 && ret == OK)
{
ret = result;
}
}
/* Dump the relocation got */
#ifdef CONFIG_NXFLAT_DUMPBUFFER
if (ret == OK && nrelocs > 0)
{
relocs = (FAR struct nxflat_reloc_s*)(offset - loadinfo->isize + loadinfo->dspace->region);
nxflat_dumpbuffer("GOT", (FAR const ubyte*)relocs, nrelocs * sizeof(struct nxflat_reloc_s));
}
#endif
return ret;
}
/****************************************************************************
* Name: nxflat_bindimports
*
* 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.
*
****************************************************************************/
static inline int nxflat_bindimports(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;
/* 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);
bvdbg("Imports offset: %08x nimports: %d\n", offset, nimports);
/* Verify that this module requires imported symbols */
if (offset != 0 && nimports > 0)
{
/* It does.. make sure that exported symbols are provided */
DEBUGASSERT(exports && 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->region);
/* Now, traverse 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++)
{
bvdbg("Import[%d] (%08p) offset: %08x func: %08x\n",
i, &imports[i], imports[i].i_funcname, imports[i].i_funcaddress);
/* 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 + sizeof(struct nxflat_hdr_s));
/* 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 import[%d] (%08p) to export '%s' (%08x)\n",
i, &imports[i], symname, imports[i].i_funcaddress);
}
}
/* Dump the relocation import table */
#ifdef CONFIG_NXFLAT_DUMPBUFFER
if (nimports > 0)
{
nxflat_dumpbuffer("Imports", (FAR const ubyte*)imports, nimports * sizeof(struct nxflat_import_s));
}
#endif
return OK;
}
/****************************************************************************
* 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'.
* After binding the module, clear the BSS region (which held the relocation
* data) in preparation for execution.
*
* 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)
{
/* Bind the imported symbol, absolute relocations separately. This is done
* before the standard relocations because that logic may modify the
* import list (for the better hopefully, but we don't want to depend on it).
*/
int ret = nxflat_bindimports(loadinfo, exports, nexports);
if (ret == OK)
{
/* Then bind all GOT relocations */
ret = nxflat_gotrelocs(loadinfo);
if (ret == OK)
{
/* Zero the BSS area, trashing the relocations that lived in that
* space in the loaded file.
*/
memset((void*)(loadinfo->dspace->region + loadinfo->datasize),
0, loadinfo->bsssize);
}
}
return ret;
}
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