execv() is a basic system interface. It should not be in libc/ but rather in sched/task. Its symboltable helper logic also belongs in the kernel but belings in binfmt/ with the other symbol table logic

2026-06-05 15:58:59 +08:00 · 2014-09-15 10:15:19 -06:00
parent 62880f60c4
commit da7a440b35
7 changed files with 356 additions and 14 deletions
@@ -0,0 +1,156 @@
+/****************************************************************************
+ * 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 */