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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
105 lines
3.2 KiB
C
105 lines
3.2 KiB
C
/****************************************************************************
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* libs/libc/modlib/modlib_verify.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 <string.h>
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#include <debug.h>
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#include <errno.h>
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#include <nuttx/arch.h>
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#include <nuttx/elf.h>
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#include <nuttx/lib/modlib.h>
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/****************************************************************************
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* Private Constant Data
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****************************************************************************/
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static const char g_modmagic[EI_MAGIC_SIZE] =
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{
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0x7f, 'E', 'L', 'F'
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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_verifyheader
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*
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* Description:
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* Given the header from a possible ELF executable, verify that it
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* is an ELF executable.
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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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* -ENOEXEC : Not an ELF file
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* -EINVAL : Not a relocatable ELF file or not supported by the current,
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* configured architecture.
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*
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****************************************************************************/
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int modlib_verifyheader(FAR const Elf_Ehdr *ehdr)
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{
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if (!ehdr)
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{
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berr("ERROR: NULL ELF header!");
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return -ENOEXEC;
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}
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/* Verify that the magic number indicates an ELF file */
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if (memcmp(ehdr->e_ident, g_modmagic, EI_MAGIC_SIZE) != 0)
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{
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binfo("Not ELF magic {%02x, %02x, %02x, %02x}\n",
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ehdr->e_ident[0], ehdr->e_ident[1], ehdr->e_ident[2],
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ehdr->e_ident[3]);
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return -ENOEXEC;
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}
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/* Verify that this is a relocatable file */
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if (ehdr->e_type != ET_REL)
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{
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if (ehdr->e_type != ET_DYN)
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{
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berr("ERROR: Not a relocatable file: e_type=%d\n", ehdr->e_type);
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return -EINVAL;
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}
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}
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/* Verify that this file works with the currently configured architecture */
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if (!up_checkarch(ehdr))
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{
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berr("ERROR: Not a supported architecture\n");
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return -ENOEXEC;
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}
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/* Looks good so far... we still might find some problems later. */
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return OK;
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}
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