206 lines
4.8 KiB
C
206 lines
4.8 KiB
C
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/* Very simple endian-ness layer for LTO object file handling
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Copyright 2010 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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/* This header file provides a simple way to handle object files in
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another endian-ness than the host machine. This is necesarry to
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enable cross-compilation with LTO enabled. Targets that use the
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ELF binary object format do not need this (libelf already handles
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endian-ness) but for COFF and Mach-O the functions in this header
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are used in the minimal binary object reader/writer.
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For all functions in this header, the user is responsible for
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making sure that the memory accesses are valid. */
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#ifndef GCC_LTO_ENDIAN_H
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#define GCC_LTO_ENDIAN_H
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#include <stdint.h>
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#include <inttypes.h>
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static inline uint16_t
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get_uint16_le (const unsigned char *ptr)
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{
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return ptr[0] | (ptr[1] << 8);
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}
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static inline uint32_t
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get_uint32_le (const unsigned char *ptr)
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{
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return ptr[0] | (ptr[1] << 8) | (ptr[2] << 16) | (ptr[3] << 24);
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}
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static inline uint64_t
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get_uint64_le (const unsigned char *ptr_)
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{
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#define ptr (uint64_t) ptr_
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return ptr[0] | (ptr[1] << 8) | (ptr[2] << 16) | (ptr[3] << 24)
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| (ptr[4] << 32) | (ptr[5] << 40) | (ptr[6] << 48) | (ptr[7] << 56);
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#undef ptr
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}
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static inline uint16_t
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get_uint16_be (const unsigned char *ptr)
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{
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return ptr[1] | (ptr[2] << 8);
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}
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static inline uint32_t
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get_uint32_be (const unsigned char *ptr)
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{
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return ptr[3] | (ptr[2] << 8) | (ptr[1] << 16) | (ptr[0] << 24);
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}
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static inline uint64_t
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get_uint64_be (const unsigned char *ptr_)
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{
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#define ptr (uint64_t) ptr_
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return ptr[7] | (ptr[6] << 8) | (ptr[5] << 16) | (ptr[4] << 24)
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| (ptr[3] << 32) | (ptr[2] << 40) | (ptr[1] << 48) | (ptr[0] << 56);
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#undef ptr
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}
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static inline void
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put_uint16_le (unsigned char *ptr, uint16_t data)
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{
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ptr[0] = data & 0xff;
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ptr[1] = (data >> 8) & 0xff;
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}
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static inline void
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put_uint32_le (unsigned char *ptr, uint32_t data)
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{
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ptr[0] = data & 0xff;
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ptr[1] = (data >> 8) & 0xff;
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ptr[2] = (data >> 16) & 0xff;
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ptr[3] = (data >> 24) & 0xff;
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}
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static inline void
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put_uint64_le (unsigned char *ptr, uint64_t data)
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{
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ptr[0] = data & 0xff;
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ptr[1] = (data >> 8) & 0xff;
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ptr[2] = (data >> 16) & 0xff;
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ptr[3] = (data >> 24) & 0xff;
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ptr[4] = (data >> 32) & 0xff;
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ptr[5] = (data >> 40) & 0xff;
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ptr[6] = (data >> 48) & 0xff;
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ptr[7] = (data >> 56) & 0xff;
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}
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static inline void
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put_uint16_be (unsigned char *ptr, uint16_t data)
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{
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ptr[1] = data & 0xff;
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ptr[0] = (data >> 8) & 0xff;
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}
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static inline void
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put_uint32_be (unsigned char *ptr, uint32_t data)
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{
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ptr[3] = data & 0xff;
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ptr[2] = (data >> 8) & 0xff;
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ptr[1] = (data >> 16) & 0xff;
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ptr[0] = (data >> 24) & 0xff;
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}
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static inline void
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put_uint64_be (unsigned char *ptr, uint64_t data)
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{
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ptr[7] = data & 0xff;
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ptr[6] = (data >> 8) & 0xff;
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ptr[5] = (data >> 16) & 0xff;
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ptr[4] = (data >> 24) & 0xff;
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ptr[3] = (data >> 32) & 0xff;
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ptr[2] = (data >> 40) & 0xff;
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ptr[1] = (data >> 48) & 0xff;
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ptr[0] = (data >> 56) & 0xff;
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}
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static inline void
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get_string (unsigned char *ptr, char *dest, size_t len)
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{
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memcpy (dest, ptr, len);
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}
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static inline void
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put_string (unsigned char *ptr, char *src, size_t len)
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{
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memcpy (ptr, src, len);
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}
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/* Use the target macro BYTES_BIG_ENDIAN to choose. */
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static inline uint16_t
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get_uint16 (const unsigned char *ptr)
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{
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if (BYTES_BIG_ENDIAN)
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return get_uint16_be (ptr);
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else
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return get_uint16_le (ptr);
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}
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static inline uint32_t
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get_uint32 (const unsigned char *ptr)
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{
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if (BYTES_BIG_ENDIAN)
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return get_uint32_be (ptr);
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else
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return get_uint32_le (ptr);
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}
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static inline uint64_t
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get_uint64 (const unsigned char *ptr)
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{
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if (BYTES_BIG_ENDIAN)
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return get_uint64_be (ptr);
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else
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return get_uint64_le (ptr);
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}
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static inline void
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put_uint16 (unsigned char *ptr, uint16_t data)
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{
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if (BYTES_BIG_ENDIAN)
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put_uint16_be (ptr, data);
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else
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put_uint16_le (ptr, data);
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}
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static inline void
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put_uint32 (unsigned char *ptr, uint32_t data)
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{
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if (BYTES_BIG_ENDIAN)
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put_uint32_be (ptr, data);
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else
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put_uint32_le (ptr, data);
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}
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static inline void
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put_uint64 (unsigned char *ptr, uint64_t data)
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{
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if (BYTES_BIG_ENDIAN)
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put_uint64_be (ptr, data);
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else
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put_uint64_le (ptr, data);
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}
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#endif /* GCC_LTO_ENDIAN_H */
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