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52482219c8
Renaming "modlib" to "libelf" is more in line with the implementation content, which makes it easier for individual developers to understand the capabilities of this module. CONFIG_LIBC_MODLIB -> CONFIG_LIBC_ELF Signed-off-by: chao an <anchao.archer@bytedance.com>
325 lines
11 KiB
C
325 lines
11 KiB
C
/****************************************************************************
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* libs/libc/elf/elf.h
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*
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* SPDX-License-Identifier: Apache-2.0
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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_LIBC_ELF_LIBC_ELF_H
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#define __LIBS_LIBC_LIBC_ELF_LIBC_ELF_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/addrenv.h>
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#include <nuttx/lib/elf.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: libelf_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 libelf_verifyheader(FAR const Elf_Ehdr *header);
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/****************************************************************************
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* Name: libelf_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 libelf_findsymtab(FAR struct mod_loadinfo_s *loadinfo);
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/****************************************************************************
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* Name: libelf_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 libelf_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: libelf_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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* sh_offset - Offset of strtab
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* exports - Pointer to the symbol table
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* nexports - Number of symbols in the symbol table*
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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 libelf_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 sh_offset,
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FAR const struct symtab_s *exports, int nexports);
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/****************************************************************************
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* Name: libelf_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 libelf_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: libelf_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 *libelf_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: libelf_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 libelf_loadhdrs(FAR struct mod_loadinfo_s *loadinfo);
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/****************************************************************************
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* Name: libelf_sectname
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*
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* Description:
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* Get the symbol name in loadinfo->iobuffer[].
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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 libelf_sectname(FAR struct mod_loadinfo_s *loadinfo,
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FAR const Elf_Shdr *shdr);
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/****************************************************************************
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* Name: libelf_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 libelf_allocbuffer(FAR struct mod_loadinfo_s *loadinfo);
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/****************************************************************************
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* Name: libelf_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 libelf_reallocbuffer(FAR struct mod_loadinfo_s *loadinfo,
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size_t increment);
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/****************************************************************************
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* Name: libelf_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 libelf_freebuffers(FAR struct mod_loadinfo_s *loadinfo);
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#ifdef CONFIG_ARCH_ADDRENV
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/****************************************************************************
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* Name: libelf_addrenv_alloc
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*
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* Description:
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* Allocate memory for the ELF image (textalloc and datastart). If
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* CONFIG_ARCH_ADDRENV=n, textalloc will be allocated using kmm_zalloc()
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* and datastart will be a offset from textalloc. If
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* CONFIG_ARCH_ADDRENV=y, then textalloc and datastart will be allocated
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* using up_addrenv_create(). In either case, there will be a unique
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* instance of textalloc and datastart (and stack) for each instance of a
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* process.
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*
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* Input Parameters:
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* loadinfo - Load state information
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* textsize - The size (in bytes) of the .text address environment needed
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* for the ELF image (read/execute).
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* datasize - The size (in bytes) of the .bss/.data address environment
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* needed for the ELF image (read/write).
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int libelf_addrenv_alloc(FAR struct mod_loadinfo_s *loadinfo,
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size_t textsize, size_t datasize);
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/****************************************************************************
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* Name: libelf_addrenv_select
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*
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* Description:
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* Temporarily select the task's address environment.
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*
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* Input Parameters:
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* loadinfo - Load state information
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int libelf_addrenv_select(FAR struct mod_loadinfo_s *loadinfo);
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/****************************************************************************
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* Name: libelf_addrenv_restore
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*
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* Description:
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* Restore the address environment before libelf_addrenv_select() was
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* called.
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*
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* Input Parameters:
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* loadinfo - Load state information
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int libelf_addrenv_restore(FAR struct mod_loadinfo_s *loadinfo);
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/****************************************************************************
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* Name: libelf_addrenv_free
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*
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* Description:
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* Release the address environment previously created by
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* libelf_addrenv_alloc(). This function is called only under certain
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* error conditions after the module has been loaded but not yet started.
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* After the module has been started, the address environment will
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* automatically be freed when the module exits.
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*
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* Input Parameters:
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* loadinfo - Load state information
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*
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* Returned Value:
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* None.
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*
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****************************************************************************/
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void libelf_addrenv_free(FAR struct mod_loadinfo_s *loadinfo);
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#endif /* CONFIG_ARCH_ADDRENV */
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#endif /* __LIBS_LIBC_LIBC_ELF_LIBC_ELF_H */
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