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
244 lines
7.9 KiB
C
244 lines
7.9 KiB
C
/****************************************************************************
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* libs/libc/modlib/modlib.h
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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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#ifndef __LIBS_LIBC_MODLIB_MODLIB_H
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#define __LIBS_LIBC_MODLIB_MODLIB_H
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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 <sys/types.h>
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#include <nuttx/arch.h>
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#include <nuttx/lib/modlib.h>
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/****************************************************************************
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* Public Function Prototypes
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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 is
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* 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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****************************************************************************/
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int modlib_verifyheader(FAR const Elf_Ehdr *header);
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/****************************************************************************
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* Name: modlib_findsymtab
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*
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* Description:
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* Find the symbol table section.
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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_findsymtab(FAR struct mod_loadinfo_s *loadinfo);
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/****************************************************************************
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* Name: modlib_readsym
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*
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* Description:
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* Read the ELF symbol structure at the specified index into memory.
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*
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* Input Parameters:
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* loadinfo - Load state information
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* index - Symbol table index
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* sym - Location to return the table entry
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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_readsym(FAR struct mod_loadinfo_s *loadinfo, int index,
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FAR Elf_Sym *sym, FAR Elf_Shdr *shdr);
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/****************************************************************************
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* Name: modlib_symvalue
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*
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* Description:
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* Get the value of a symbol. The updated value of the symbol is returned
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* in the st_value field of the symbol table entry.
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*
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* Input Parameters:
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* modp - Module state information
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* loadinfo - Load state information
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* sym - Symbol table entry (value might be undefined)
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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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* EINVAL - There is something inconsistent in the symbol table (should
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* only happen if the file is corrupted)
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* ENOSYS - Symbol lies in common
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* ESRCH - Symbol has no name
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* ENOENT - Symbol undefined and not provided via a symbol table
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*
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****************************************************************************/
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int modlib_symvalue(FAR struct module_s *modp,
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FAR struct mod_loadinfo_s *loadinfo, FAR Elf_Sym *sym,
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Elf_Off offset);
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/****************************************************************************
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* Name: modlib_insertsymtab
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*
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* Description:
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* Insert a symbol table for the current module.
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*
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* Input Parameters:
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* modp - Module state information
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* loadinfo - Module load information
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* shdr - Symbol table section header
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* sym - Symbol table entry
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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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* ENOMEM - Symbol undefined and not provided via a symbol table
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*
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****************************************************************************/
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int modlib_insertsymtab(FAR struct module_s *modp,
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FAR struct mod_loadinfo_s *loadinfo,
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FAR Elf_Shdr *shdr,
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FAR Elf_Sym *sym);
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/****************************************************************************
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* Name: modlib_findglobal
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*
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* Description:
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* Find a symbol in the global symbol table
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*
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* Input Parameters:
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* modp - Module state information
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* loadinfo - Module load information
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* shdr - Symbol table section header
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* sym - Symbol table entry
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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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* ENOMEM - Symbol undefined and not provided via a symbol table
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*
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****************************************************************************/
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void *modlib_findglobal(FAR struct module_s *modp,
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FAR struct mod_loadinfo_s *loadinfo,
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FAR Elf_Shdr *shdr,
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FAR Elf_Sym *sym);
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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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* Name: modlib_findsection
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*
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* Description:
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* A section by its name.
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*
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* Input Parameters:
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* loadinfo - Load state information
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* sectname - Name of the section to find
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*
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* Returned Value:
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* On success, the index to the section is returned; A negated errno value
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* is returned on failure.
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*
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****************************************************************************/
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int modlib_findsection(FAR struct mod_loadinfo_s *loadinfo,
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FAR const char *sectname);
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/****************************************************************************
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* Name: modlib_allocbuffer
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*
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* Description:
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* Perform the initial allocation of the I/O buffer, if it has not already
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* been allocated.
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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_allocbuffer(FAR struct mod_loadinfo_s *loadinfo);
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/****************************************************************************
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* Name: modlib_reallocbuffer
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*
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* Description:
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* Increase the size of I/O buffer by the specified buffer increment.
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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_reallocbuffer(FAR struct mod_loadinfo_s *loadinfo,
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size_t increment);
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/****************************************************************************
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* Name: modlib_freebuffers
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*
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* Description:
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* Release all working buffers.
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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_freebuffers(FAR struct mod_loadinfo_s *loadinfo);
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#endif /* __LIBS_LIBC_MODLIB_MODLIB_H */
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