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Diffstat (limited to 'libelf/libelf_align.c')
| -rw-r--r-- | libelf/libelf_align.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/libelf/libelf_align.c b/libelf/libelf_align.c new file mode 100644 index 0000000..42669f1 --- /dev/null +++ b/libelf/libelf_align.c @@ -0,0 +1,154 @@ +/*- + * 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. + */ + +//__FBSDID("$FreeBSD: src/lib/libelf/libelf_align.c,v 1.3.2.2.2.1 2010/12/21 17:09:25 kensmith Exp $"); +#include "_libelf.h" + +struct align { + int a32; + int a64; +}; + +#ifdef __GNUC__ +#define MALIGN(N) { \ + .a32 = __alignof__(Elf32_##N), \ + .a64 = __alignof__(Elf64_##N) \ + } +#define MALIGN64(V) { \ + .a32 = 0, \ + .a64 = __alignof__(Elf64_##V) \ + } +#define MALIGN_WORD() { \ + .a32 = __alignof__(int32_t), \ + .a64 = __alignof__(int64_t) \ + } +#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 __FreeBSD_version >= 700025 + [ELF_T_CAP] = MALIGN(Cap), +#endif + [ELF_T_DYN] = MALIGN(Dyn), + [ELF_T_EHDR] = MALIGN(Ehdr), + [ELF_T_HALF] = MALIGN(Half), +#if __FreeBSD_version >= 700025 + [ELF_T_LWORD] = MALIGN(Lword), + [ELF_T_MOVE] = MALIGN(Move), +#endif + [ELF_T_MOVEP] = UNSUPPORTED(), +#if __FreeBSD_version >= 700025 + [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 __FreeBSD_version >= 700025 + [ELF_T_SYMINFO] = MALIGN(Syminfo), +#endif +#if __FreeBSD_version >= 700009 + [ELF_T_VDEF] = MALIGN(Verdef), + [ELF_T_VNEED] = MALIGN(Verneed), +#endif + [ELF_T_WORD] = MALIGN(Word), + [ELF_T_XWORD] = MALIGN64(Xword), +#if __FreeBSD_version >= 800062 + [ELF_T_GNUHASH] = MALIGN_WORD() +#endif +}; + +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 __FreeBSD_version >= 700025 + [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 __FreeBSD_version >= 700025 + [ELF_T_LWORD] = FALIGN(8,8), + [ELF_T_MOVE] = FALIGN(8,8), +#endif + [ELF_T_MOVEP] = UNSUPPORTED(), +#if __FreeBSD_version >= 700025 + [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 __FreeBSD_version >= 700025 + [ELF_T_SYMINFO] = FALIGN(2,2), +#endif +#if __FreeBSD_version >= 700009 + [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), +#if __FreeBSD_version >= 800062 + [ELF_T_GNUHASH] = FALIGN(4,8) +#endif +}; + +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); +} |