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/* simple-object-common.h -- common structs for object file manipulation.
Copyright (C) 2010-2022 Free Software Foundation, Inc.
This file is part of the libiberty library.
Libiberty is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
Libiberty is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with libiberty; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, USA. */
/* Forward reference. */
struct simple_object_functions;
/* An object file opened for reading. */
struct simple_object_read_struct
{
/* The file descriptor. */
int descriptor;
/* The offset within the file. */
off_t offset;
/* The functions which do the actual work. */
const struct simple_object_functions *functions;
/* Private data for the object file format. */
void *data;
};
/* Object file attributes. */
struct simple_object_attributes_struct
{
/* The functions which do the actual work. */
const struct simple_object_functions *functions;
/* Private data for the object file format. */
void *data;
};
/* An object file being created. */
struct simple_object_write_struct
{
/* The functions which do the actual work. */
const struct simple_object_functions *functions;
/* The segment_name argument from the user. */
char *segment_name;
/* The start of the list of sections. */
simple_object_write_section *sections;
/* The last entry in the list of sections. */
simple_object_write_section *last_section;
/* Private data for the object file format. */
void *data;
};
/* A section in an object file being created. */
struct simple_object_write_section_struct
{
/* Next in the list of sections attached to an
simple_object_write. */
simple_object_write_section *next;
/* The name of this section. */
char *name;
/* The required alignment. */
unsigned int align;
/* The first data attached to this section. */
struct simple_object_write_section_buffer *buffers;
/* The last data attached to this section. */
struct simple_object_write_section_buffer *last_buffer;
};
/* Data attached to a section. */
struct simple_object_write_section_buffer
{
/* The next data for this section. */
struct simple_object_write_section_buffer *next;
/* The size of the buffer. */
size_t size;
/* The actual bytes. */
const void *buffer;
/* A buffer to free, or NULL. */
void *free_buffer;
};
/* The number of bytes we read from the start of the file to pass to
the match function. */
#define SIMPLE_OBJECT_MATCH_HEADER_LEN (16)
/* Format-specific object file functions. */
struct simple_object_functions
{
/* If this file matches these functions, return a new value for the
private data for an simple_object_read. HEADER is the first 16
bytes of the file. DESCRIPTOR, OFFSET, SEGMENT_NAME, ERRMSG, and
ERR are as for simple_object_open_read. If this file does not
match, this function should return NULL with *ERRMSG set to
NULL. */
void *(*match) (unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN],
int descriptor, off_t offset, const char *segment_name,
const char **errmsg, int *err);
/* Implement simple_object_find_sections. */
const char *(*find_sections) (simple_object_read *,
int (*pfn) (void *, const char *,
off_t offset, off_t length),
void *data,
int *err);
/* Return the private data for the attributes for SOBJ. */
void *(*fetch_attributes) (simple_object_read *sobj, const char **errmsg,
int *err);
/* Release the private data for an simple_object_read. */
void (*release_read) (void *);
/* Merge the private data for the attributes of two files. If they
could be linked together, return NULL. Otherwise return an error
message. */
const char *(*attributes_merge) (void *, void *, int *err);
/* Release the private data for an simple_object_attributes. */
void (*release_attributes) (void *);
/* Start creating an object file. */
void *(*start_write) (void *attributes_data, const char **errmsg,
int *err);
/* Write the complete object file. */
const char *(*write_to_file) (simple_object_write *sobj, int descriptor,
int *err);
/* Release the private data for an simple_object_write. */
void (*release_write) (void *);
/* Copy LTO debug sections. */
const char *(*copy_lto_debug_sections) (simple_object_read *sobj,
simple_object_write *dobj,
char *(*pfn) (const char *),
int *err);
};
/* The known object file formats. */
extern const struct simple_object_functions simple_object_coff_functions;
extern const struct simple_object_functions simple_object_elf_functions;
extern const struct simple_object_functions simple_object_mach_o_functions;
extern const struct simple_object_functions simple_object_xcoff_functions;
/* Read SIZE bytes from DESCRIPTOR at file offset OFFSET into BUFFER.
Return non-zero on success. On failure return 0 and set *ERRMSG
and *ERR. */
extern int
simple_object_internal_read (int descriptor, off_t offset,
unsigned char *buffer, size_t size,
const char **errmsg, int *err);
/* Write SIZE bytes from BUFFER to DESCRIPTOR at file offset OFFSET.
Return non-zero on success. On failure return 0 and set *ERRMSG
and *ERR. */
extern int
simple_object_internal_write (int descriptor, off_t offset,
const unsigned char *buffer, size_t size,
const char **errmsg, int *err);
/* Define ulong_type as an unsigned 64-bit type if available.
Otherwise just make it unsigned long. */
#ifdef UNSIGNED_64BIT_TYPE
__extension__ typedef UNSIGNED_64BIT_TYPE ulong_type;
#else
typedef unsigned long ulong_type;
#endif
/* Fetch a big-endian 16-bit value. */
static inline unsigned short
simple_object_fetch_big_16 (const unsigned char *buf)
{
return ((unsigned short) buf[0] << 8) | (unsigned short) buf[1];
}
/* Fetch a little-endian 16-bit value. */
static inline unsigned short
simple_object_fetch_little_16 (const unsigned char *buf)
{
return ((unsigned short) buf[1] << 8) | (unsigned short) buf[0];
}
/* Fetch a big-endian 32-bit value. */
static inline unsigned int
simple_object_fetch_big_32 (const unsigned char *buf)
{
return (((unsigned int) buf[0] << 24)
| ((unsigned int) buf[1] << 16)
| ((unsigned int) buf[2] << 8)
| (unsigned int) buf[3]);
}
/* Fetch a little-endian 32-bit value. */
static inline unsigned int
simple_object_fetch_little_32 (const unsigned char *buf)
{
return (((unsigned int) buf[3] << 24)
| ((unsigned int) buf[2] << 16)
| ((unsigned int) buf[1] << 8)
| (unsigned int) buf[0]);
}
/* Fetch a big-endian 32-bit value as a ulong_type. */
static inline ulong_type
simple_object_fetch_big_32_ulong (const unsigned char *buf)
{
return (ulong_type) simple_object_fetch_big_32 (buf);
}
/* Fetch a little-endian 32-bit value as a ulong_type. */
static inline ulong_type
simple_object_fetch_little_32_ulong (const unsigned char *buf)
{
return (ulong_type) simple_object_fetch_little_32 (buf);
}
#ifdef UNSIGNED_64BIT_TYPE
/* Fetch a big-endian 64-bit value. */
static inline ulong_type
simple_object_fetch_big_64 (const unsigned char *buf)
{
return (((ulong_type) buf[0] << 56)
| ((ulong_type) buf[1] << 48)
| ((ulong_type) buf[2] << 40)
| ((ulong_type) buf[3] << 32)
| ((ulong_type) buf[4] << 24)
| ((ulong_type) buf[5] << 16)
| ((ulong_type) buf[6] << 8)
| (ulong_type) buf[7]);
}
/* Fetch a little-endian 64-bit value. */
static inline ulong_type
simple_object_fetch_little_64 (const unsigned char *buf)
{
return (((ulong_type) buf[7] << 56)
| ((ulong_type) buf[6] << 48)
| ((ulong_type) buf[5] << 40)
| ((ulong_type) buf[4] << 32)
| ((ulong_type) buf[3] << 24)
| ((ulong_type) buf[2] << 16)
| ((ulong_type) buf[1] << 8)
| (ulong_type) buf[0]);
}
#endif
/* Store a big-endian 16-bit value. */
static inline void
simple_object_set_big_16 (unsigned char *buf, unsigned short val)
{
buf[0] = (val >> 8) & 0xff;
buf[1] = val & 0xff;
}
/* Store a little-endian 16-bit value. */
static inline void
simple_object_set_little_16 (unsigned char *buf, unsigned short val)
{
buf[1] = (val >> 8) & 0xff;
buf[0] = val & 0xff;
}
/* Store a big-endian 32-bit value. */
static inline void
simple_object_set_big_32 (unsigned char *buf, unsigned int val)
{
buf[0] = (val >> 24) & 0xff;
buf[1] = (val >> 16) & 0xff;
buf[2] = (val >> 8) & 0xff;
buf[3] = val & 0xff;
}
/* Store a little-endian 32-bit value. */
static inline void
simple_object_set_little_32 (unsigned char *buf, unsigned int val)
{
buf[3] = (val >> 24) & 0xff;
buf[2] = (val >> 16) & 0xff;
buf[1] = (val >> 8) & 0xff;
buf[0] = val & 0xff;
}
/* Store a big-endian 32-bit value coming in as a ulong_type. */
static inline void
simple_object_set_big_32_ulong (unsigned char *buf, ulong_type val)
{
simple_object_set_big_32 (buf, val);
}
/* Store a little-endian 32-bit value coming in as a ulong_type. */
static inline void
simple_object_set_little_32_ulong (unsigned char *buf, ulong_type val)
{
simple_object_set_little_32 (buf, val);
}
#ifdef UNSIGNED_64BIT_TYPE
/* Store a big-endian 64-bit value. */
static inline void
simple_object_set_big_64 (unsigned char *buf, ulong_type val)
{
buf[0] = (val >> 56) & 0xff;
buf[1] = (val >> 48) & 0xff;
buf[2] = (val >> 40) & 0xff;
buf[3] = (val >> 32) & 0xff;
buf[4] = (val >> 24) & 0xff;
buf[5] = (val >> 16) & 0xff;
buf[6] = (val >> 8) & 0xff;
buf[7] = val & 0xff;
}
/* Store a little-endian 64-bit value. */
static inline void
simple_object_set_little_64 (unsigned char *buf, ulong_type val)
{
buf[7] = (val >> 56) & 0xff;
buf[6] = (val >> 48) & 0xff;
buf[5] = (val >> 40) & 0xff;
buf[4] = (val >> 32) & 0xff;
buf[3] = (val >> 24) & 0xff;
buf[2] = (val >> 16) & 0xff;
buf[1] = (val >> 8) & 0xff;
buf[0] = val & 0xff;
}
#endif
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