diff options
Diffstat (limited to 'usr.sbin/kldxref/ef_i386.c')
-rw-r--r-- | usr.sbin/kldxref/ef_i386.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/usr.sbin/kldxref/ef_i386.c b/usr.sbin/kldxref/ef_i386.c new file mode 100644 index 0000000..9b10c7d --- /dev/null +++ b/usr.sbin/kldxref/ef_i386.c @@ -0,0 +1,97 @@ +/*- + * Copyright (c) 2003 Jake Burkholder. + * Copyright 1996-1998 John D. Polstra. + * 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. + * + * $FreeBSD$ + */ + +#include <sys/types.h> +#include <machine/elf.h> + +#include <err.h> +#include <errno.h> +#include <string.h> + +#include "ef.h" + +/* + * Apply relocations to the values we got from the file. `relbase' is the + * target relocation address of the section, and `dataoff' is the target + * relocation address of the data in `dest'. + */ +int +ef_reloc(struct elf_file *ef, const void *reldata, int reltype, Elf_Off relbase, + Elf_Off dataoff, size_t len, void *_dest) +{ + Elf_Addr *where, addr, addend; + Elf_Size rtype, symidx; + const Elf_Rel *rel; + const Elf_Rela *rela; + char *dest = _dest; + + switch (reltype) { + case EF_RELOC_REL: + rel = (const Elf_Rel *)reldata; + where = (Elf_Addr *)(dest + relbase + rel->r_offset - dataoff); + addend = 0; + rtype = ELF_R_TYPE(rel->r_info); + symidx = ELF_R_SYM(rel->r_info); + break; + case EF_RELOC_RELA: + rela = (const Elf_Rela *)reldata; + where = (Elf_Addr *)(dest + relbase + rela->r_offset - dataoff); + addend = rela->r_addend; + rtype = ELF_R_TYPE(rela->r_info); + symidx = ELF_R_SYM(rela->r_info); + break; + default: + return (EINVAL); + } + + if ((char *)where < (char *)dest || (char *)where >= (char *)dest + len) + return (0); + + if (reltype == EF_RELOC_REL) + addend = *where; + + switch (rtype) { + case R_386_RELATIVE: /* A + B */ + addr = (Elf_Addr)addend + relbase; + *where = addr; + break; + case R_386_32: /* S + A - P */ + addr = EF_SYMADDR(ef, symidx); + addr += addend; + *where = addr; + break; + case R_386_GLOB_DAT: /* S */ + addr = EF_SYMADDR(ef, symidx); + *where = addr; + break; + default: + warnx("unhandled relocation type %d", (int)rtype); + } + return (0); +} |