52482219c8
Renaming "modlib" to "libelf" is more in line with the implementation content, which makes it easier for individual developers to understand the capabilities of this module. CONFIG_LIBC_MODLIB -> CONFIG_LIBC_ELF Signed-off-by: chao an <anchao.archer@bytedance.com>
132 lines
4.2 KiB
C
132 lines
4.2 KiB
C
/****************************************************************************
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* libs/libc/elf/elf_read.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <sys/types.h>
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#include <inttypes.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <string.h>
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#include <debug.h>
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#include <errno.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/lib/elf.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#undef ELF_DUMP_READDATA /* Define to dump all file data read */
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: libelf_dumpreaddata
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****************************************************************************/
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#ifdef ELF_DUMP_READDATA
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# define libelf_dumpreaddata(b,n) binfodumpbuffer("libelf_read",b,n)
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#else
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# define libelf_dumpreaddata(b,n)
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: libelf_read
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*
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* Description:
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* Read 'readsize' bytes from the object file at 'offset'. The data is
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* read into 'buffer.'
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*
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* Returned Value:
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* 0 (OK) is returned on success and a negated errno is returned on
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* failure.
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*
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****************************************************************************/
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int libelf_read(FAR struct mod_loadinfo_s *loadinfo, FAR uint8_t *buffer,
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size_t readsize, off_t offset)
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{
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size_t nsize = readsize;
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ssize_t nbytes; /* Number of bytes read */
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off_t rpos; /* Position returned by lseek */
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int errval;
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binfo("Read %zu bytes from offset %" PRIdOFF "\n", readsize, offset);
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/* Loop until all of the requested data has been read. */
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/* Seek to the read position */
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rpos = _NX_SEEK(loadinfo->filfd, offset, SEEK_SET);
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if (rpos != offset)
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{
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errval = _NX_GETERRNO(rpos);
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berr("ERROR: Failed to seek to position %" PRIdOFF ": %d\n",
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offset, errval);
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return -errval;
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}
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while (readsize > 0)
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{
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/* Read the file data at offset into the user buffer */
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nbytes = _NX_READ(loadinfo->filfd,
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buffer + nsize - readsize, readsize);
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if (nbytes < 0)
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{
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errval = _NX_GETERRNO(nbytes);
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/* EINTR just means that we received a signal */
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if (errval != EINTR)
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{
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berr("ERROR: Read from offset %" PRIdOFF " failed: %d\n",
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(off_t)(offset + nsize - readsize), errval);
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return -errval;
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}
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}
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else if (nbytes == 0)
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{
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berr("ERROR: Unexpected end of file\n");
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return -ENODATA;
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}
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else
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{
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readsize -= nbytes;
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}
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}
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libelf_dumpreaddata(buffer, nsize);
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return OK;
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}
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