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- /****************************************************************************
- * binfmt/binfmt_execsymtab.c
- *
- * Copyright (C) 2013, 2016, 2018 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <assert.h>
- #include <nuttx/irq.h>
- #include <nuttx/arch.h>
- #include <nuttx/binfmt/symtab.h>
- #ifdef CONFIG_LIBC_EXECFUNCS
- /****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
- /* If CONFIG_LIBC_EXECFUNCS is defined in the configuration, then the
- * following must also be defined:
- */
- #ifdef CONFIG_EXECFUNCS_HAVE_SYMTAB
- /* Symbol table used by exec[l|v] */
- # ifndef CONFIG_EXECFUNCS_SYMTAB_ARRAY
- # error "CONFIG_EXECFUNCS_SYMTAB_ARRAY must be defined"
- # endif
- /* Number of Symbols in the Table */
- # ifndef CONFIG_EXECFUNCS_NSYMBOLS_VAR
- # error "CONFIG_EXECFUNCS_NSYMBOLS_VAR must be defined"
- # endif
- #endif
- /****************************************************************************
- * Public Data
- ****************************************************************************/
- #ifdef CONFIG_EXECFUNCS_HAVE_SYMTAB
- extern const struct symtab_s CONFIG_EXECFUNCS_SYMTAB_ARRAY[];
- extern int CONFIG_EXECFUNCS_NSYMBOLS_VAR;
- #endif
- /****************************************************************************
- * Private Data
- ****************************************************************************/
- static FAR const struct symtab_s *g_exec_symtab;
- static int g_exec_nsymbols;
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: exec_getsymtab
- *
- * Description:
- * Get the current symbol table selection as an atomic operation.
- *
- * Input Parameters:
- * symtab - The location to store the symbol table.
- * nsymbols - The location to store the number of symbols in the symbol table.
- *
- * Returned Value:
- * None
- *
- ****************************************************************************/
- void exec_getsymtab(FAR const struct symtab_s **symtab, FAR int *nsymbols)
- {
- irqstate_t flags;
- DEBUGASSERT(symtab != NULL && nsymbols != NULL);
- /* Disable interrupts very briefly so that both the symbol table and its
- * size are returned as a single atomic operation.
- */
- flags = enter_critical_section();
- #ifdef CONFIG_EXECFUNCS_HAVE_SYMTAB
- /* If a bring-up symbol table has been provided and if the exec symbol
- * table has not yet been initialized, then use the provided start-up
- * symbol table.
- */
- if (g_exec_symtab == NULL)
- {
- g_exec_symtab = CONFIG_EXECFUNCS_SYMTAB_ARRAY;
- g_exec_nsymbols = CONFIG_EXECFUNCS_NSYMBOLS_VAR;
- }
- #endif
- /* Return the symbol table and its size */
- *symtab = g_exec_symtab;
- *nsymbols = g_exec_nsymbols;
- leave_critical_section(flags);
- }
- /****************************************************************************
- * Name: exec_setsymtab
- *
- * Description:
- * Select a new symbol table selection as an atomic operation.
- *
- * Input Parameters:
- * symtab - The new symbol table.
- * nsymbols - The number of symbols in the symbol table.
- *
- * Returned Value:
- * None
- *
- ****************************************************************************/
- void exec_setsymtab(FAR const struct symtab_s *symtab, int nsymbols)
- {
- irqstate_t flags;
- DEBUGASSERT(symtab != NULL);
- /* Disable interrupts very briefly so that both the symbol table and its
- * size are set as a single atomic operation.
- */
- flags = enter_critical_section();
- g_exec_symtab = symtab;
- g_exec_nsymbols = nsymbols;
- leave_critical_section(flags);
- }
- #endif /* CONFIG_LIBC_EXECFUNCS */
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