modify nuttx bug of lack of files

2021-06-11 11:25:07 +08:00
parent 4a7f51a5e9
commit 6d0f2ca39a
6752 changed files with 1528133 additions and 0 deletions
@@ -0,0 +1,206 @@
+/****************************************************************************
+ * libs/libc/modlib/modlib_sections.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+#include <assert.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/lib/modlib.h>
+
+#include "libc.h"
+#include "modlib/modlib.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: modlib_sectname
+ *
+ * Description:
+ *   Get the symbol name in loadinfo->iobuffer[].
+ *
+ * Returned Value:
+ *   0 (OK) is returned on success and a negated errno is returned on
+ *   failure.
+ *
+ ****************************************************************************/
+
+static inline int modlib_sectname(FAR struct mod_loadinfo_s *loadinfo,
+                                  FAR const Elf_Shdr *shdr)
+{
+  FAR Elf_Shdr *shstr;
+  FAR uint8_t *buffer;
+  off_t  offset;
+  size_t readlen;
+  size_t bytesread;
+  int shstrndx;
+  int ret;
+
+  /* Get the section header table index of the entry associated with the
+   * section name string table. If the file has no section name string table,
+   * this member holds the value SH_UNDEF.
+   */
+
+  shstrndx = loadinfo->ehdr.e_shstrndx;
+  if (shstrndx == SHN_UNDEF)
+    {
+      berr("ERROR: No section header string table\n");
+      return -EINVAL;
+    }
+
+  /* Get the section name string table section header */
+
+  shstr = &loadinfo->shdr[shstrndx];
+
+  /* Get the file offset to the string that is the name of the section. This
+   * is the sum of:
+   *
+   *   shstr->sh_offset: The file offset to the first byte of the section
+   *     header string table data.
+   *   shdr->sh_name: The offset to the name of the section in the section
+   *     name table
+   */
+
+  offset = shstr->sh_offset + shdr->sh_name;
+
+  /* Loop until we get the entire section name into memory */
+
+  bytesread = 0;
+
+  for (; ; )
+    {
+      /* Get the number of bytes to read */
+
+      readlen = loadinfo->buflen - bytesread;
+      if (offset + readlen > loadinfo->filelen)
+        {
+          if (loadinfo->filelen <= offset)
+            {
+              berr("ERROR: At end of file\n");
+              return -EINVAL;
+            }
+
+          readlen = loadinfo->filelen - offset;
+        }
+
+      /* Read that number of bytes into the array */
+
+      buffer = &loadinfo->iobuffer[bytesread];
+      ret = modlib_read(loadinfo, buffer, readlen, offset);
+      if (ret < 0)
+        {
+          berr("ERROR: Failed to read section name: %d\n", ret);
+          return ret;
+        }
+
+      bytesread += readlen;
+
+      /* Did we read the NUL terminator? */
+
+      if (memchr(buffer, '\0', readlen) != NULL)
+        {
+          /* Yes, the buffer contains a NUL terminator. */
+
+          return OK;
+        }
+
+      /* No.. then we have to read more */
+
+      ret = modlib_reallocbuffer(loadinfo, CONFIG_MODLIB_BUFFERINCR);
+      if (ret < 0)
+        {
+          berr("ERROR: mod_reallocbuffer failed: %d\n", ret);
+          return ret;
+        }
+    }
+
+  /* We will not get here */
+
+  return OK;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: modlib_findsection
+ *
+ * Description:
+ *   A section by its name.
+ *
+ * Input Parameters:
+ *   loadinfo - Load state information
+ *   sectname - Name of the section to find
+ *
+ * Returned Value:
+ *   On success, the index to the section is returned; A negated errno value
+ *   is returned on failure.
+ *
+ ****************************************************************************/
+
+int modlib_findsection(FAR struct mod_loadinfo_s *loadinfo,
+                       FAR const char *sectname)
+{
+  FAR const Elf_Shdr *shdr;
+  int ret;
+  int i;
+
+  /* Search through the shdr[] array in loadinfo for a section named
+   * 'sectname'
+   */
+
+  for (i = 0; i < loadinfo->ehdr.e_shnum; i++)
+    {
+      /* Get the name of this section */
+
+      shdr = &loadinfo->shdr[i];
+      ret  = modlib_sectname(loadinfo, shdr);
+      if (ret < 0)
+        {
+          berr("ERROR: modlib_sectname failed: %d\n", ret);
+          return ret;
+        }
+
+      /* Check if the name of this section is 'sectname' */
+
+      binfo("%d. Comparing \"%s\" and .\"%s\"\n",
+            i, loadinfo->iobuffer, sectname);
+
+      if (strcmp((FAR const char *)loadinfo->iobuffer, sectname) == 0)
+        {
+          /* We found it... return the index */
+
+          return i;
+        }
+    }
+
+  /* We failed to find a section with this name. */
+
+  return -ENOENT;
+}