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1 /* |
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2 byteswap.h - functions and macros for byte swapping. |
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3 Copyright (C) 1995 - 2001 Michael Riepe |
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4 |
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5 This library is free software; you can redistribute it and/or |
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6 modify it under the terms of the GNU Library General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2 of the License, or (at your option) any later version. |
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9 |
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10 This library is distributed in the hope that it will be useful, |
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 Library General Public License for more details. |
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14 |
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15 You should have received a copy of the GNU Library General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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18 */ |
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19 |
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20 /* @(#) $Id: byteswap.h,v 1.6 2005/05/21 15:39:20 michael Exp $ */ |
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21 |
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22 #ifndef _BYTESWAP_H |
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23 #define _BYTESWAP_H |
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24 |
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25 #define lu(from,i,s) (((__libelf_u32_t)((unsigned char*)(from))[i])<<(s)) |
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26 #define li(from,i,s) (((__libelf_i32_t)(( signed char*)(from))[i])<<(s)) |
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27 |
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28 #define __load_u16L(from) ((__libelf_u32_t) \ |
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29 (lu(from,1,8) | lu(from,0,0))) |
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30 #define __load_u16M(from) ((__libelf_u32_t) \ |
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31 (lu(from,0,8) | lu(from,1,0))) |
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32 #define __load_i16L(from) ((__libelf_i32_t) \ |
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33 (li(from,1,8) | lu(from,0,0))) |
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34 #define __load_i16M(from) ((__libelf_i32_t) \ |
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35 (li(from,0,8) | lu(from,1,0))) |
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36 |
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37 #define __load_u32L(from) ((__libelf_u32_t) \ |
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38 (lu(from,3,24) | lu(from,2,16) | lu(from,1,8) | lu(from,0,0))) |
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39 #define __load_u32M(from) ((__libelf_u32_t) \ |
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40 (lu(from,0,24) | lu(from,1,16) | lu(from,2,8) | lu(from,3,0))) |
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41 #define __load_i32L(from) ((__libelf_i32_t) \ |
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42 (li(from,3,24) | lu(from,2,16) | lu(from,1,8) | lu(from,0,0))) |
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43 #define __load_i32M(from) ((__libelf_i32_t) \ |
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44 (li(from,0,24) | lu(from,1,16) | lu(from,2,8) | lu(from,3,0))) |
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45 |
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46 #define su(to,i,v,s) (((char*)(to))[i]=((__libelf_u32_t)(v)>>(s))) |
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47 #define si(to,i,v,s) (((char*)(to))[i]=((__libelf_i32_t)(v)>>(s))) |
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48 |
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49 #define __store_u16L(to,v) \ |
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50 (su(to,1,v,8), su(to,0,v,0)) |
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51 #define __store_u16M(to,v) \ |
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52 (su(to,0,v,8), su(to,1,v,0)) |
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53 #define __store_i16L(to,v) \ |
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54 (si(to,1,v,8), si(to,0,v,0)) |
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55 #define __store_i16M(to,v) \ |
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56 (si(to,0,v,8), si(to,1,v,0)) |
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57 |
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58 #define __store_u32L(to,v) \ |
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59 (su(to,3,v,24), su(to,2,v,16), su(to,1,v,8), su(to,0,v,0)) |
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60 #define __store_u32M(to,v) \ |
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61 (su(to,0,v,24), su(to,1,v,16), su(to,2,v,8), su(to,3,v,0)) |
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62 #define __store_i32L(to,v) \ |
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63 (si(to,3,v,24), si(to,2,v,16), si(to,1,v,8), si(to,0,v,0)) |
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64 #define __store_i32M(to,v) \ |
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65 (si(to,0,v,24), si(to,1,v,16), si(to,2,v,8), si(to,3,v,0)) |
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66 |
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67 #if __LIBELF64 |
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68 |
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69 /* |
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70 * conversion functions from swap64.c |
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71 */ |
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72 extern __libelf_u64_t _elf_load_u64L(const unsigned char *from); |
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73 extern __libelf_u64_t _elf_load_u64M(const unsigned char *from); |
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74 extern __libelf_i64_t _elf_load_i64L(const unsigned char *from); |
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75 extern __libelf_i64_t _elf_load_i64M(const unsigned char *from); |
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76 extern void _elf_store_u64L(unsigned char *to, __libelf_u64_t v); |
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77 extern void _elf_store_u64M(unsigned char *to, __libelf_u64_t v); |
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78 extern void _elf_store_i64L(unsigned char *to, __libelf_u64_t v); |
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79 extern void _elf_store_i64M(unsigned char *to, __libelf_u64_t v); |
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80 |
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81 /* |
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82 * aliases for existing conversion code |
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83 */ |
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84 #define __load_u64L _elf_load_u64L |
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85 #define __load_u64M _elf_load_u64M |
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86 #define __load_i64L _elf_load_i64L |
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87 #define __load_i64M _elf_load_i64M |
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88 #define __store_u64L _elf_store_u64L |
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89 #define __store_u64M _elf_store_u64M |
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90 #define __store_i64L _elf_store_i64L |
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91 #define __store_i64M _elf_store_i64M |
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92 |
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93 #endif /* __LIBELF64 */ |
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94 |
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95 #endif /* _BYTESWAP_H */ |