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author | Lorenz Meier <lm@inf.ethz.ch> | 2013-01-26 12:07:01 +0100 |
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committer | Lorenz Meier <lm@inf.ethz.ch> | 2013-01-26 12:07:01 +0100 |
commit | beb463874808e94d8ca99ab14402895c10cfb63e (patch) | |
tree | 33efd417f138b964660d21deaf74bfb733b03c24 /nuttx/libc/unistd/lib_execsymtab.c | |
parent | 7459169230c4fbb738aaa79f61592048e537cf02 (diff) | |
parent | beb45222985f1eb9fbe21b22b95c30ab8ca5bbac (diff) | |
download | px4-firmware-beb463874808e94d8ca99ab14402895c10cfb63e.tar.gz px4-firmware-beb463874808e94d8ca99ab14402895c10cfb63e.tar.bz2 px4-firmware-beb463874808e94d8ca99ab14402895c10cfb63e.zip |
Merge branch 'master' of github.com:PX4/Firmware into statemachine_docs
Diffstat (limited to 'nuttx/libc/unistd/lib_execsymtab.c')
-rw-r--r-- | nuttx/libc/unistd/lib_execsymtab.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/nuttx/libc/unistd/lib_execsymtab.c b/nuttx/libc/unistd/lib_execsymtab.c new file mode 100644 index 000000000..34b798bb4 --- /dev/null +++ b/nuttx/libc/unistd/lib_execsymtab.c @@ -0,0 +1,147 @@ +/**************************************************************************** + * libc/unistd/lib_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: + */ + +/* 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 + +/**************************************************************************** + * Public Variables + ****************************************************************************/ + +extern const struct symtab_s CONFIG_EXECFUNCS_SYMTAB; + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +static FAR const struct symtab_s *g_exec_symtab = &CONFIG_EXECFUNCS_SYMTAB; +static int g_exec_nsymbols = CONFIG_EXECFUNCS_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 && 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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