356 lines
9.9 KiB
C
356 lines
9.9 KiB
C
/* simple-object-common.h -- common structs for object file manipulation.
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Copyright (C) 2010 Free Software Foundation, Inc.
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This file is part of the libiberty library.
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Libiberty is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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Libiberty is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with libiberty; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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/* Forward reference. */
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struct simple_object_functions;
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/* An object file opened for reading. */
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struct simple_object_read_struct
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{
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/* The file descriptor. */
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int descriptor;
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/* The offset within the file. */
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off_t offset;
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/* The functions which do the actual work. */
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const struct simple_object_functions *functions;
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/* Private data for the object file format. */
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void *data;
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};
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/* Object file attributes. */
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struct simple_object_attributes_struct
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{
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/* The functions which do the actual work. */
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const struct simple_object_functions *functions;
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/* Private data for the object file format. */
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void *data;
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};
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/* An object file being created. */
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struct simple_object_write_struct
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{
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/* The functions which do the actual work. */
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const struct simple_object_functions *functions;
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/* The segment_name argument from the user. */
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char *segment_name;
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/* The start of the list of sections. */
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simple_object_write_section *sections;
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/* The last entry in the list of sections. */
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simple_object_write_section *last_section;
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/* Private data for the object file format. */
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void *data;
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};
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/* A section in an object file being created. */
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struct simple_object_write_section_struct
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{
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/* Next in the list of sections attached to an
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simple_object_write. */
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simple_object_write_section *next;
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/* The name of this section. */
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char *name;
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/* The required alignment. */
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unsigned int align;
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/* The first data attached to this section. */
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struct simple_object_write_section_buffer *buffers;
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/* The last data attached to this section. */
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struct simple_object_write_section_buffer *last_buffer;
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};
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/* Data attached to a section. */
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struct simple_object_write_section_buffer
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{
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/* The next data for this section. */
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struct simple_object_write_section_buffer *next;
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/* The size of the buffer. */
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size_t size;
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/* The actual bytes. */
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const void *buffer;
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/* A buffer to free, or NULL. */
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void *free_buffer;
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};
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/* The number of bytes we read from the start of the file to pass to
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the match function. */
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#define SIMPLE_OBJECT_MATCH_HEADER_LEN (16)
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/* Format-specific object file functions. */
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struct simple_object_functions
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{
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/* If this file matches these functions, return a new value for the
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private data for an simple_object_read. HEADER is the first 16
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bytes of the file. DESCRIPTOR, OFFSET, SEGMENT_NAME, ERRMSG, and
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ERR are as for simple_object_open_read. If this file does not
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match, this function should return NULL with *ERRMSG set to
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NULL. */
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void *(*match) (unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN],
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int descriptor, off_t offset, const char *segment_name,
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const char **errmsg, int *err);
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/* Implement simple_object_find_sections. */
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const char *(*find_sections) (simple_object_read *,
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int (*pfn) (void *, const char *,
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off_t offset, off_t length),
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void *data,
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int *err);
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/* Return the private data for the attributes for SOBJ. */
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void *(*fetch_attributes) (simple_object_read *sobj, const char **errmsg,
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int *err);
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/* Release the private data for an simple_object_read. */
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void (*release_read) (void *);
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/* Merge the private data for the attributes of two files. If they
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could be linked together, return NULL. Otherwise return an error
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message. */
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const char *(*attributes_merge) (void *, void *, int *err);
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/* Release the private data for an simple_object_attributes. */
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void (*release_attributes) (void *);
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/* Start creating an object file. */
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void *(*start_write) (void *attributes_data, const char **errmsg,
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int *err);
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/* Write the complete object file. */
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const char *(*write_to_file) (simple_object_write *sobj, int descriptor,
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int *err);
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/* Release the private data for an simple_object_write. */
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void (*release_write) (void *);
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};
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/* The known object file formats. */
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extern const struct simple_object_functions simple_object_coff_functions;
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extern const struct simple_object_functions simple_object_elf_functions;
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extern const struct simple_object_functions simple_object_mach_o_functions;
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/* Read SIZE bytes from DESCRIPTOR at file offset OFFSET into BUFFER.
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Return non-zero on success. On failure return 0 and set *ERRMSG
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and *ERR. */
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extern int
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simple_object_internal_read (int descriptor, off_t offset,
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unsigned char *buffer, size_t size,
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const char **errmsg, int *err);
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/* Write SIZE bytes from BUFFER to DESCRIPTOR at file offset OFFSET.
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Return non-zero on success. On failure return 0 and set *ERRMSG
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and *ERR. */
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extern int
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simple_object_internal_write (int descriptor, off_t offset,
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const unsigned char *buffer, size_t size,
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const char **errmsg, int *err);
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/* Define ulong_type as an unsigned 64-bit type if available.
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Otherwise just make it unsigned long. */
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#ifdef UNSIGNED_64BIT_TYPE
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__extension__ typedef UNSIGNED_64BIT_TYPE ulong_type;
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#else
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typedef unsigned long ulong_type;
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#endif
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/* Fetch a big-endian 16-bit value. */
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static inline unsigned short
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simple_object_fetch_big_16 (const unsigned char *buf)
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{
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return ((unsigned short) buf[0] << 8) | (unsigned short) buf[1];
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}
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/* Fetch a little-endian 16-bit value. */
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static inline unsigned short
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simple_object_fetch_little_16 (const unsigned char *buf)
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{
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return ((unsigned short) buf[1] << 8) | (unsigned short) buf[0];
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}
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/* Fetch a big-endian 32-bit value. */
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static inline unsigned int
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simple_object_fetch_big_32 (const unsigned char *buf)
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{
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return (((unsigned int) buf[0] << 24)
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| ((unsigned int) buf[1] << 16)
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| ((unsigned int) buf[2] << 8)
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| (unsigned int) buf[3]);
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}
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/* Fetch a little-endian 32-bit value. */
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static inline unsigned int
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simple_object_fetch_little_32 (const unsigned char *buf)
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{
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return (((unsigned int) buf[3] << 24)
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| ((unsigned int) buf[2] << 16)
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| ((unsigned int) buf[1] << 8)
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| (unsigned int) buf[0]);
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}
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/* Fetch a big-endian 32-bit value as a ulong_type. */
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static inline ulong_type
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simple_object_fetch_big_32_ulong (const unsigned char *buf)
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{
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return (ulong_type) simple_object_fetch_big_32 (buf);
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}
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/* Fetch a little-endian 32-bit value as a ulong_type. */
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static inline ulong_type
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simple_object_fetch_little_32_ulong (const unsigned char *buf)
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{
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return (ulong_type) simple_object_fetch_little_32 (buf);
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}
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#ifdef UNSIGNED_64BIT_TYPE
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/* Fetch a big-endian 64-bit value. */
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static inline ulong_type
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simple_object_fetch_big_64 (const unsigned char *buf)
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{
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return (((ulong_type) buf[0] << 56)
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| ((ulong_type) buf[1] << 48)
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| ((ulong_type) buf[2] << 40)
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| ((ulong_type) buf[3] << 32)
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| ((ulong_type) buf[4] << 24)
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| ((ulong_type) buf[5] << 16)
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| ((ulong_type) buf[6] << 8)
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| (ulong_type) buf[7]);
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}
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/* Fetch a little-endian 64-bit value. */
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static inline ulong_type
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simple_object_fetch_little_64 (const unsigned char *buf)
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{
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return (((ulong_type) buf[7] << 56)
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| ((ulong_type) buf[6] << 48)
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| ((ulong_type) buf[5] << 40)
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| ((ulong_type) buf[4] << 32)
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| ((ulong_type) buf[3] << 24)
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| ((ulong_type) buf[2] << 16)
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| ((ulong_type) buf[1] << 8)
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| (ulong_type) buf[0]);
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}
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#endif
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/* Store a big-endian 16-bit value. */
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static inline void
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simple_object_set_big_16 (unsigned char *buf, unsigned short val)
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{
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buf[0] = (val >> 8) & 0xff;
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buf[1] = val & 0xff;
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}
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/* Store a little-endian 16-bit value. */
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static inline void
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simple_object_set_little_16 (unsigned char *buf, unsigned short val)
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{
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buf[1] = (val >> 8) & 0xff;
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buf[0] = val & 0xff;
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}
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/* Store a big-endian 32-bit value. */
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static inline void
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simple_object_set_big_32 (unsigned char *buf, unsigned int val)
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{
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buf[0] = (val >> 24) & 0xff;
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buf[1] = (val >> 16) & 0xff;
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buf[2] = (val >> 8) & 0xff;
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buf[3] = val & 0xff;
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}
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/* Store a little-endian 32-bit value. */
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static inline void
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simple_object_set_little_32 (unsigned char *buf, unsigned int val)
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{
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buf[3] = (val >> 24) & 0xff;
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buf[2] = (val >> 16) & 0xff;
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buf[1] = (val >> 8) & 0xff;
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buf[0] = val & 0xff;
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}
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/* Store a big-endian 32-bit value coming in as a ulong_type. */
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static inline void
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simple_object_set_big_32_ulong (unsigned char *buf, ulong_type val)
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{
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simple_object_set_big_32 (buf, val);
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}
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/* Store a little-endian 32-bit value coming in as a ulong_type. */
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static inline void
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simple_object_set_little_32_ulong (unsigned char *buf, ulong_type val)
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{
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simple_object_set_little_32 (buf, val);
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}
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#ifdef UNSIGNED_64BIT_TYPE
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/* Store a big-endian 64-bit value. */
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static inline void
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simple_object_set_big_64 (unsigned char *buf, ulong_type val)
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{
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buf[0] = (val >> 56) & 0xff;
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buf[1] = (val >> 48) & 0xff;
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buf[2] = (val >> 40) & 0xff;
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buf[3] = (val >> 32) & 0xff;
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buf[4] = (val >> 24) & 0xff;
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buf[5] = (val >> 16) & 0xff;
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buf[6] = (val >> 8) & 0xff;
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buf[7] = val & 0xff;
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}
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/* Store a little-endian 64-bit value. */
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static inline void
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simple_object_set_little_64 (unsigned char *buf, ulong_type val)
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{
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buf[7] = (val >> 56) & 0xff;
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buf[6] = (val >> 48) & 0xff;
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buf[5] = (val >> 40) & 0xff;
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buf[4] = (val >> 32) & 0xff;
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buf[3] = (val >> 24) & 0xff;
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buf[2] = (val >> 16) & 0xff;
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buf[1] = (val >> 8) & 0xff;
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buf[0] = val & 0xff;
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}
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#endif
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