157 lines
4.7 KiB
C
157 lines
4.7 KiB
C
/****************************************************************************
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* binfmt/binfmt_execsymtab.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 <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include <nuttx/binfmt/symtab.h>
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#ifdef CONFIG_LIBC_EXECFUNCS
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* If CONFIG_LIBC_EXECFUNCS is defined in the configuration, then the
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* following must also be defined:
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*/
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#ifdef CONFIG_EXECFUNCS_HAVE_SYMTAB
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/* Symbol table used by exec[l|v] */
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# ifndef CONFIG_EXECFUNCS_SYMTAB_ARRAY
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# error "CONFIG_EXECFUNCS_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_EXECFUNCS_NSYMBOLS_VAR
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# error "CONFIG_EXECFUNCS_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_EXECFUNCS_HAVE_SYMTAB
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extern const struct symtab_s CONFIG_EXECFUNCS_SYMTAB_ARRAY[];
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extern int CONFIG_EXECFUNCS_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_exec_symtab;
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static int g_exec_nsymbols;
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: exec_getsymtab
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*
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* Description:
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* Get the current 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 exec_getsymtab(FAR const struct symtab_s **symtab, FAR int *nsymbols)
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{
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irqstate_t flags;
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DEBUGASSERT(symtab != NULL && nsymbols != NULL);
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/* Disable interrupts very briefly so that both the symbol table and its
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* size are returned as a single atomic operation.
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*/
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flags = enter_critical_section();
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#ifdef CONFIG_EXECFUNCS_HAVE_SYMTAB
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/* If a bring-up symbol table has been provided and if the exec symbol
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* table has not yet been initialized, then use the provided start-up
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* symbol table.
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*/
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if (g_exec_symtab == NULL)
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{
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g_exec_symtab = CONFIG_EXECFUNCS_SYMTAB_ARRAY;
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g_exec_nsymbols = CONFIG_EXECFUNCS_NSYMBOLS_VAR;
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}
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#endif
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/* Return the symbol table and its size */
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*symtab = g_exec_symtab;
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*nsymbols = g_exec_nsymbols;
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leave_critical_section(flags);
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}
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/****************************************************************************
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* Name: exec_setsymtab
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*
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* Description:
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* Select a new 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 exec_setsymtab(FAR const struct symtab_s *symtab, int nsymbols)
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{
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irqstate_t flags;
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DEBUGASSERT(symtab != NULL);
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/* Disable interrupts very briefly so that both the symbol table and its
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* size are set as a single atomic operation.
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*/
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flags = enter_critical_section();
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g_exec_symtab = symtab;
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g_exec_nsymbols = nsymbols;
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leave_critical_section(flags);
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}
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#endif /* CONFIG_LIBC_EXECFUNCS */
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