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>
131 lines
4.1 KiB
C
131 lines
4.1 KiB
C
/****************************************************************************
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* libs/libc/elf/elf_symtab.c
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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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/****************************************************************************
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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 <nuttx/symtab.h>
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#include <nuttx/lib/elf.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifdef CONFIG_LIBC_ELF_HAVE_SYMTAB
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/* Symbol table used by dlsym */
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# ifndef CONFIG_LIBC_ELF_SYMTAB_ARRAY
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# error "CONFIG_LIBC_ELF_SYMTAB_ARRAY must be defined"
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# endif
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/* Number of Symbols in the Table */
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# ifndef CONFIG_LIBC_ELF_NSYMBOLS_VAR
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# error "CONFIG_LIBC_ELF_NSYMBOLS_VAR must be defined"
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# endif
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#endif
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifdef CONFIG_LIBC_ELF_HAVE_SYMTAB
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extern const struct symtab_s CONFIG_LIBC_ELF_SYMTAB_ARRAY[];
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extern int CONFIG_LIBC_ELF_NSYMBOLS_VAR;
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#endif
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static FAR const struct symtab_s *g_libelf_symtab;
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static int g_libelf_nsymbols;
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: libelf_getsymtab
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*
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* Description:
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* Get the current kernel symbol table selection as an atomic operation.
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*
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* Input Parameters:
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* symtab - The location to store the symbol table.
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* nsymbols - The location to store the number of symbols in the symbol
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* table.
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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_getsymtab(FAR const struct symtab_s **symtab, FAR int *nsymbols)
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{
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DEBUGASSERT(symtab != NULL && nsymbols != NULL);
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/* Borrow the registry lock to assure atomic access */
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libelf_registry_lock();
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#ifdef CONFIG_LIBC_ELF_HAVE_SYMTAB
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if (g_libelf_symtab == NULL)
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{
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g_libelf_symtab = CONFIG_LIBC_ELF_SYMTAB_ARRAY;
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g_libelf_nsymbols = CONFIG_LIBC_ELF_NSYMBOLS_VAR;
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}
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#endif
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*symtab = g_libelf_symtab;
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*nsymbols = g_libelf_nsymbols;
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libelf_registry_unlock();
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}
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/****************************************************************************
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* Name: libelf_setsymtab
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*
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* Description:
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* Select a new kernel symbol table selection as an atomic operation.
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*
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* Input Parameters:
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* symtab - The new symbol table.
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* nsymbols - The number of symbols in the symbol table.
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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_setsymtab(FAR const struct symtab_s *symtab, int nsymbols)
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{
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/* Borrow the registry lock to assure atomic access */
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libelf_registry_lock();
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g_libelf_symtab = symtab;
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g_libelf_nsymbols = nsymbols;
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libelf_registry_unlock();
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}
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