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/****************************************************************************
* binfmt/binfmt_execsymtab.c
*
* Copyright (C) 2013 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/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
# error "CONFIG_EXECFUNCS_SYMTAB must be defined"
# endif
/* Number of Symbols in the Table */
# ifndef CONFIG_EXECFUNCS_NSYMBOLS
# error "CONFIG_EXECFUNCS_NSYMBOLS must be defined"
# endif
#endif
/****************************************************************************
* Public Variables
****************************************************************************/
#ifdef CONFIG_EXECFUNCS_HAVE_SYMTAB
extern const struct symtab_s CONFIG_EXECFUNCS_SYMTAB;
#endif
/****************************************************************************
* Private Data
****************************************************************************/
#ifdef CONFIG_EXECFUNCS_HAVE_SYMTAB
static FAR const struct symtab_s *g_exec_symtab = &CONFIG_EXECFUNCS_SYMTAB;
static int g_exec_nsymbols = CONFIG_EXECFUNCS_NSYMBOLS;
#else
static FAR const struct symtab_s *g_exec_symtab;
static int g_exec_nsymbols;
#endif
/****************************************************************************
* 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 && nsymbols);
/* Disable interrupts very briefly so that both the symbol table and its
* size are returned as a single atomic operation.
*/
flags = irqsave();
*symtab = g_exec_symtab;
*nsymbols = g_exec_nsymbols;
irqrestore(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);
/* Disable interrupts very briefly so that both the symbol table and its
* size are set as a single atomic operation.
*/
flags = irqsave();
g_exec_symtab = symtab;
g_exec_nsymbols = nsymbols;
irqrestore(flags);
}
#endif /* CONFIG_LIBC_EXECFUNCS */
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