forked from Archive/PX4-Autopilot
147 lines
4.9 KiB
C
147 lines
4.9 KiB
C
/****************************************************************************
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* libc/unistd/lib_execsymtab.c
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*
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* Copyright (C) 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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/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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/* Symbol table used by exec[l|v] */
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#ifndef CONFIG_EXECFUNCS_SYMTAB
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# error "CONFIG_EXECFUNCS_SYMTAB 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
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# error "CONFIG_EXECFUNCS_NSYMBOLS must be defined"
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#endif
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/****************************************************************************
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* Public Variables
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****************************************************************************/
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extern const struct symtab_s CONFIG_EXECFUNCS_SYMTAB;
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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 = &CONFIG_EXECFUNCS_SYMTAB;
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static int g_exec_nsymbols = CONFIG_EXECFUNCS_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 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 && nsymbols);
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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 = irqsave();
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*symtab = g_exec_symtab;
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*nsymbols = g_exec_nsymbols;
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irqrestore(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);
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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 = irqsave();
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g_exec_symtab = symtab;
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g_exec_nsymbols = nsymbols;
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irqrestore(flags);
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}
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#endif /* CONFIG_LIBC_EXECFUNCS */ |