diff options
Diffstat (limited to 'nuttx/binfmt/libnxflat/libnxflat_bind.c')
| -rw-r--r-- | nuttx/binfmt/libnxflat/libnxflat_bind.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/nuttx/binfmt/libnxflat/libnxflat_bind.c b/nuttx/binfmt/libnxflat/libnxflat_bind.c new file mode 100644 index 000000000..887fcfe58 --- /dev/null +++ b/nuttx/binfmt/libnxflat/libnxflat_bind.c @@ -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; +} + |