external/bsd/elftoolchain/dist/libelf/libelf_align.c

   1 /*      $NetBSD: libelf_align.c,v 1.3 2014/04/18 02:28:06 christos Exp $        */
   2
   3 /*-
   4  * Copyright (c) 2006,2008 Joseph Koshy
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #if HAVE_NBTOOL_CONFIG_H
  30 # include "nbtool_config.h"
  31 #endif
  32
  33 #include <sys/cdefs.h>
  34
  35 #include <sys/types.h>
  36
  37 #include <libelf.h>
  38
  39 #include "_libelf.h"
  40
  41 __RCSID("$NetBSD: libelf_align.c,v 1.3 2014/04/18 02:28:06 christos Exp $");
  42 ELFTC_VCSID("Id: libelf_align.c 2225 2011-11-26 18:55:54Z jkoshy ");
  43
  44 struct align {
  45         int a32;
  46         int a64;
  47 };
  48
  49 #if defined(__GNUC__) || defined(__lint__)
  50 #define MALIGN(N)       {                                       \
  51                 .a32 = __alignof__(Elf32_##N),                  \
  52                 .a64 = __alignof__(Elf64_##N)                   \
  53         }
  54 #define MALIGN64(V)       {                                     \
  55                 .a32 = 0,                                       \
  56                 .a64 = __alignof__(Elf64_##V)                   \
  57         }
  58 #define MALIGN_WORD()   {                                       \
  59                 .a32 = __alignof__(int32_t),                    \
  60                 .a64 = __alignof__(int64_t)                     \
  61             }
  62 #else
  63 #error  Need the __alignof__ builtin.
  64 #endif
  65 #define UNSUPPORTED()   {                                       \
  66                 .a32 = 0,                                       \
  67                 .a64 = 0                                        \
  68         }
  69
  70 static struct align malign[ELF_T_NUM] = {
  71         [ELF_T_ADDR]    = MALIGN(Addr),
  72         [ELF_T_BYTE]    = { .a32 = 1, .a64 = 1 },
  73         [ELF_T_CAP]     = MALIGN(Cap),
  74         [ELF_T_DYN]     = MALIGN(Dyn),
  75         [ELF_T_EHDR]    = MALIGN(Ehdr),
  76         [ELF_T_HALF]    = MALIGN(Half),
  77         [ELF_T_LWORD]   = MALIGN(Lword),
  78         [ELF_T_MOVE]    = MALIGN(Move),
  79         [ELF_T_MOVEP]   = UNSUPPORTED(),
  80         [ELF_T_NOTE]    = MALIGN(Nhdr),
  81         [ELF_T_OFF]     = MALIGN(Off),
  82         [ELF_T_PHDR]    = MALIGN(Phdr),
  83         [ELF_T_REL]     = MALIGN(Rel),
  84         [ELF_T_RELA]    = MALIGN(Rela),
  85         [ELF_T_SHDR]    = MALIGN(Shdr),
  86         [ELF_T_SWORD]   = MALIGN(Sword),
  87         [ELF_T_SXWORD]  = MALIGN64(Sxword),
  88         [ELF_T_SYM]     = MALIGN(Sym),
  89         [ELF_T_SYMINFO] = MALIGN(Syminfo),
  90         [ELF_T_VDEF]    = MALIGN(Verdef),
  91         [ELF_T_VNEED]   = MALIGN(Verneed),
  92         [ELF_T_WORD]    = MALIGN(Word),
  93         [ELF_T_XWORD]   = MALIGN64(Xword),
  94         [ELF_T_GNUHASH] = MALIGN_WORD()
  95 };
  96
  97 int
  98 _libelf_malign(Elf_Type t, int elfclass)
  99 {
 100         if (t >= ELF_T_NUM || (int) t < 0)
 101                 return (0);
 102
 103         return (elfclass == ELFCLASS32 ? malign[t].a32 :
 104             malign[t].a64);
 105 }
 106
 107 #define FALIGN(A32,A64) { .a32 = (A32), .a64 = (A64) }
 108
 109 static struct align falign[ELF_T_NUM] = {
 110         [ELF_T_ADDR]    = FALIGN(4,8),
 111         [ELF_T_BYTE]    = FALIGN(1,1),
 112         [ELF_T_CAP]     = FALIGN(4,8),
 113         [ELF_T_DYN]     = FALIGN(4,8),
 114         [ELF_T_EHDR]    = FALIGN(4,8),
 115         [ELF_T_HALF]    = FALIGN(2,2),
 116         [ELF_T_LWORD]   = FALIGN(8,8),
 117         [ELF_T_MOVE]    = FALIGN(8,8),
 118         [ELF_T_MOVEP]   = UNSUPPORTED(),
 119         [ELF_T_NOTE]    = FALIGN(4,4),
 120         [ELF_T_OFF]     = FALIGN(4,8),
 121         [ELF_T_PHDR]    = FALIGN(4,8),
 122         [ELF_T_REL]     = FALIGN(4,8),
 123         [ELF_T_RELA]    = FALIGN(4,8),
 124         [ELF_T_SHDR]    = FALIGN(4,8),
 125         [ELF_T_SWORD]   = FALIGN(4,4),
 126         [ELF_T_SXWORD]  = FALIGN(0,8),
 127         [ELF_T_SYM]     = FALIGN(4,8),
 128         [ELF_T_SYMINFO] = FALIGN(2,2),
 129         [ELF_T_VDEF]    = FALIGN(4,4),
 130         [ELF_T_VNEED]   = FALIGN(4,4),
 131         [ELF_T_WORD]    = FALIGN(4,4),
 132         [ELF_T_XWORD]   = FALIGN(0,8),
 133         [ELF_T_GNUHASH] = FALIGN(4,8)
 134 };
 135
 136 int
 137 _libelf_falign(Elf_Type t, int elfclass)
 138 {
 139         if (t >= ELF_T_NUM || (int) t < 0)
 140                 return (0);
 141
 142         return (elfclass == ELFCLASS32 ? falign[t].a32 :
 143             falign[t].a64);
 144 }