/* $NetBSD: libelf_align.c,v 1.5 2010/02/22 10:48:32 darran Exp $ */ /*- * Copyright (c) 2006 Joseph Koshy * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #if HAVE_NBTOOL_CONFIG_H # include "nbtool_config.h" #endif #include /* __FBSDID("$FreeBSD: src/lib/libelf/libelf_align.c,v 1.3.2.1.2.1 2009/10/25 01:10:29 kensmith Exp $"); */ #include #include #include #include "_libelf.h" struct align { int a32; int a64; }; #if defined(__lint__) #define MALIGN(N) { \ .a32 = sizeof(Elf32_##N), \ .a64 = sizeof(Elf64_##N) \ } #define MALIGN64(V) { \ .a32 = 0, \ .a64 = sizeof(Elf64_##V) \ } #elif defined(__GNUC__) #define MALIGN(N) { \ .a32 = __alignof__(Elf32_##N), \ .a64 = __alignof__(Elf64_##N) \ } #define MALIGN64(V) { \ .a32 = 0, \ .a64 = __alignof__(Elf64_##V) \ } #else #error Need the __alignof__ builtin. #endif #define UNSUPPORTED() { \ .a32 = 0, \ .a64 = 0 \ } static struct align malign[ELF_T_NUM] = { [ELF_T_ADDR] = MALIGN(Addr), [ELF_T_BYTE] = { .a32 = 1, .a64 = 1 }, #if defined(__LIBELF_HAVE_ELF_CAP) [ELF_T_CAP] = MALIGN(Cap), #endif [ELF_T_DYN] = MALIGN(Dyn), [ELF_T_EHDR] = MALIGN(Ehdr), [ELF_T_HALF] = MALIGN(Half), #if defined(__LIBELF_HAVE_ELF_MOVE) [ELF_T_LWORD] = MALIGN(Lword), [ELF_T_MOVE] = MALIGN(Move), #endif [ELF_T_MOVEP] = UNSUPPORTED(), #if defined(__LIBELF_HAVE_ELF_NOTE) [ELF_T_NOTE] = MALIGN(Nhdr), #endif [ELF_T_OFF] = MALIGN(Off), [ELF_T_PHDR] = MALIGN(Phdr), [ELF_T_REL] = MALIGN(Rel), [ELF_T_RELA] = MALIGN(Rela), [ELF_T_SHDR] = MALIGN(Shdr), [ELF_T_SWORD] = MALIGN(Sword), [ELF_T_SXWORD] = MALIGN64(Sxword), [ELF_T_SYM] = MALIGN(Sym), #if defined(__LIBELF_HAVE_ELF_SYMINFO) [ELF_T_SYMINFO] = MALIGN(Syminfo), #endif #if defined(__LIBELF_HAVE_ELF_VERS) [ELF_T_VDEF] = MALIGN(Verdef), [ELF_T_VNEED] = MALIGN(Verneed), #endif [ELF_T_WORD] = MALIGN(Word), [ELF_T_XWORD] = MALIGN64(Xword) }; int _libelf_malign(Elf_Type t, int elfclass) { if (t >= ELF_T_NUM || (int) t < 0) return (0); return (elfclass == ELFCLASS32 ? malign[t].a32 : malign[t].a64); } #define FALIGN(A32,A64) { .a32 = (A32), .a64 = (A64) } static struct align falign[ELF_T_NUM] = { [ELF_T_ADDR] = FALIGN(4,8), [ELF_T_BYTE] = FALIGN(1,1), #if defined(__LIBELF_HAVE_ELF_CAP) [ELF_T_CAP] = FALIGN(4,8), #endif [ELF_T_DYN] = FALIGN(4,8), [ELF_T_EHDR] = FALIGN(4,8), [ELF_T_HALF] = FALIGN(2,2), #if defined(__LIBELF_HAVE_ELF_MOVE) [ELF_T_LWORD] = FALIGN(8,8), [ELF_T_MOVE] = FALIGN(8,8), #endif [ELF_T_MOVEP] = UNSUPPORTED(), #if defined(__LIBELF_HAVE_ELF_NOTE) [ELF_T_NOTE] = FALIGN(1,1), #endif [ELF_T_OFF] = FALIGN(4,8), [ELF_T_PHDR] = FALIGN(4,8), [ELF_T_REL] = FALIGN(4,8), [ELF_T_RELA] = FALIGN(4,8), [ELF_T_SHDR] = FALIGN(4,8), [ELF_T_SWORD] = FALIGN(4,4), [ELF_T_SXWORD] = FALIGN(0,8), [ELF_T_SYM] = FALIGN(4,8), #if defined(__LIBELF_HAVE_ELF_SYMINFO) [ELF_T_SYMINFO] = FALIGN(2,2), #endif #if defined(__LIBELF_HAVE_ELF_VERS) [ELF_T_VDEF] = FALIGN(4,4), [ELF_T_VNEED] = FALIGN(4,4), #endif [ELF_T_WORD] = FALIGN(4,4), [ELF_T_XWORD] = FALIGN(0,8) }; int _libelf_falign(Elf_Type t, int elfclass) { if (t >= ELF_T_NUM || (int) t < 0) return (0); return (elfclass == ELFCLASS32 ? falign[t].a32 : falign[t].a64); }