diff options
Diffstat (limited to 'nuttx/binfmt/libelf/libelf_read.c')
-rw-r--r-- | nuttx/binfmt/libelf/libelf_read.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/nuttx/binfmt/libelf/libelf_read.c b/nuttx/binfmt/libelf/libelf_read.c new file mode 100644 index 000000000..5f00a531e --- /dev/null +++ b/nuttx/binfmt/libelf/libelf_read.c @@ -0,0 +1,165 @@ +/**************************************************************************** + * binfmt/libelf/libelf_read.c + * + * Copyright (C) 2012 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 <sys/types.h> +#include <stdint.h> +#include <unistd.h> +#include <string.h> +#include <elf.h> +#include <debug.h> +#include <errno.h> + +#include <arpa/inet.h> +#include <nuttx/elf.h> + +/**************************************************************************** + * Pre-Processor Definitions + ****************************************************************************/ + +#undef ELF_DUMP_READDATA /* Define to dump all file data read */ +#define DUMPER lib_rawprintf /* If ELF_DUMP_READDATA is defined, this + * is the API used to dump data */ + +/**************************************************************************** + * Private Constant Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: elf_dumpreaddata + ****************************************************************************/ + +#if defined(ELF_DUMP_READDATA) +static inline void elf_dumpreaddata(char *buffer, int buflen) +{ + uint32_t *buf32 = (uint32_t*)buffer; + int i; + int j; + + for (i = 0; i < buflen; i += 32) + { + DUMPER("%04x:", i); + for (j = 0; j < 32; j += sizeof(uint32_t)) + { + DUMPER(" %08x", *buf32++); + } + DUMPER("\n"); + } +} +#else +# define elf_dumpreaddata(b,n) +#endif + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: elf_read + * + * Description: + * Read 'readsize' bytes from the object file at 'offset' + * + * Returned Value: + * 0 (OK) is returned on success and a negated errno is returned on + * failure. + * + ****************************************************************************/ + +int elf_read(struct elf_loadinfo_s *loadinfo, char *buffer, int readsize, int offset) +{ + ssize_t nbytes; /* Number of bytes read */ + off_t rpos; /* Position returned by lseek */ + char *bufptr; /* Next buffer location to read into */ + int bytesleft; /* Number of bytes of .data left to read */ + int bytesread; /* Total number of bytes read */ + + bvdbg("Read %d bytes from offset %d\n", readsize, offset); + + /* Seek to the position in the object file where the initialized + * data is saved. + */ + + bytesread = 0; + bufptr = buffer; + bytesleft = readsize; + do + { + rpos = lseek(loadinfo->filfd, offset, SEEK_SET); + if (rpos != offset) + { + bdbg("Failed to seek to position %d: %d\n", offset, errno); + return -errno; + } + + /* Read the file data at offset into the user buffer */ + + nbytes = read(loadinfo->filfd, bufptr, bytesleft); + if (nbytes < 0) + { + if (errno != EINTR) + { + bdbg("Read of .data failed: %d\n", errno); + return -errno; + } + } + else if (nbytes == 0) + { + bdbg("Unexpected end of file\n"); + return -ENODATA; + } + else + { + bytesread += nbytes; + bytesleft -= nbytes; + bufptr += nbytes; + offset += nbytes; + } + } + while (bytesread < readsize); + + elf_dumpreaddata(buffer, readsize); + return OK; +} + |