fec789047a
* libs/libc/machine/arm/armv7-m/arch_elf.c
- Fix cast of error message parameters
* build-globals.sh
- Build the modlib_globals.S file used to resolve symbols when dynamically loading
* libs/libc/modlib/Make.defs
- Build modlib_globals.S for all targets
* libs/libc/modlib/modlib_load.c
- Calculate sizes and text/data addresses based on program headers rather than section headers
- Handle objects with no program headers
* libs/libc/modlib/modlib_bind.c
- Call modlib_readsym with pointer to symbol table
- Add modlib_relocatedyn to manage relocation of symbols with shared object (ET_DYN)
- Differentiate between ET_REL and ET_DYN objects
- Use arch independent symbol ELF_R_SYM
- Cast sizes to avoid warnings
* libs/libc/modlib/modlib_load.c
- Cast sizes to avoid warnings
* include/elf.h
- Add definitions that may be found in shared objects
* include/nuttx/lib/modlib.h
- Add parameter to modlib_readsym prototype
- Add prototypes for:
- modlib_insertsymtab
- modlib_findglobal
- Define Elf_Dyn and Elf_Off according to the elf architecture
- Add fields to mod_loadifno_s:
- Program headers
- Exported symbols
- Data section address
- Padding requirement
- Section index for dynamic symbol table
- Number of symbols exported
- Add prottotype for modlib_freesymtab
* libs/libc/dlfcn/lib_dlclose.c
- Free the symbol table when the dll is closed
* libs/libc/dlfcn/lib_dlopen.c
- Add dump of program headers to debug routine
- Differentiate between ET_REL and ET_DYN objects
* libs/libc/machine/arm/armv7-m/arch_elf.c
- Add handling of R_ARM_RELATIVE and R_ARM_JUMP slot relocation types
* libs/libc/modlib/modlib_loadshdrs.c
- Rename modlib_loadshdrs.c to modlib_loadhdrs.c
- Rename modlib_loadshdrs to modlib_loadhdrs
- Add code to load program headers
* libs/libc/modlib/modlib_symbols.c
- Define entry point structure
- Add offset parameter to modlib_symname() and use to find symbol names
- Add symtab section header parameter to modlib_readsym()
- Add offset parameter to modlib_symvalue() to locate symbol names
- Add modlib_insertsyntab() to create a symbol table for exporting and resolution
- Add findEP() to resolve a symbol in the modlib_global table
- Add modlib_findglobal() to find symbol in the modlib_global table
- Add modlib_freesymtab() to free the symbol table
* libs/libc/modlib/modlib_uninit.c
- Free header and sections from a module_loadinfo_s control block
* libs/libc/modlib/modlib_verify.c
- Handle ET_DYN shared objects
* libs/libc/modlib/modlib_globals.S
- Multi-target global table
- Define library APIs that may be resolved when loading a shared object
144 lines
4.4 KiB
C
144 lines
4.4 KiB
C
/****************************************************************************
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* libs/libc/modlib/modlib_loadhdrs.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/lib/modlib.h>
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#include "libc.h"
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#include "modlib/modlib.h"
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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: modlib_loadhdrs
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*
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* Description:
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* Loads program and section headers into memory.
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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 modlib_loadhdrs(FAR struct mod_loadinfo_s *loadinfo)
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{
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size_t shdrsize;
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size_t phdrsize;
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int ret;
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DEBUGASSERT(loadinfo->shdr == NULL);
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DEBUGASSERT(loadinfo->phdr == NULL);
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/* Verify that there are sections */
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if (loadinfo->ehdr.e_shnum < 1)
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{
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berr("ERROR: No sections(?)\n");
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return -EINVAL;
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}
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/* Verify that there are program headers */
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if (loadinfo->ehdr.e_phnum < 1)
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{
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berr("ERROR: No program headers(?)\n");
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return -EINVAL;
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}
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/* Get the total size of the section header table */
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shdrsize = (size_t)loadinfo->ehdr.e_shentsize *
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(size_t)loadinfo->ehdr.e_shnum;
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if (loadinfo->ehdr.e_shoff + shdrsize > loadinfo->filelen)
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{
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berr("ERROR: Insufficient space in file for section header table\n");
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return -ESPIPE;
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}
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/* Get the total size of the program header table */
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phdrsize = (size_t)loadinfo->ehdr.e_phentsize *
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(size_t)loadinfo->ehdr.e_phnum;
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if (loadinfo->ehdr.e_phoff + phdrsize > loadinfo->filelen)
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{
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berr("ERROR: Insufficent space in file for program header table\n");
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return -ESPIPE;
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}
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/* Allocate memory to hold a working copy of the sector header table */
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loadinfo->shdr = (FAR FAR Elf_Shdr *)lib_malloc(shdrsize);
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if (!loadinfo->shdr)
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{
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berr("ERROR: Failed to allocate the section header table. Size: %ld\n",
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(long)shdrsize);
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return -ENOMEM;
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}
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/* Read the section header table into memory */
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ret = modlib_read(loadinfo, (FAR uint8_t *)loadinfo->shdr, shdrsize,
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loadinfo->ehdr.e_shoff);
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if (ret < 0)
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{
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berr("ERROR: Failed to read section header table: %d\n", ret);
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}
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/* Allocate memory to hold a working copy of the program header table */
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loadinfo->phdr = (FAR FAR Elf_Phdr *)lib_malloc(phdrsize);
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if (!loadinfo->shdr)
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{
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lib_free((FAR void *)loadinfo->shdr);
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berr("ERROR: Failed to allocate the program header table. Size: %ld\n",
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(long)phdrsize);
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return -ENOMEM;
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}
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/* Read the program header table into memory */
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ret = modlib_read(loadinfo, (FAR uint8_t *)loadinfo->phdr, phdrsize,
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loadinfo->ehdr.e_phoff);
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if (ret < 0)
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{
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berr("ERROR: Failed to read program header table: %d\n", ret);
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lib_free((FAR void *)loadinfo->phdr);
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lib_free((FAR void *)loadinfo->shdr);
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}
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return ret;
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}
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