127 lines
3.4 KiB
C
127 lines
3.4 KiB
C
/*-
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* Copyright 1996-1998 John D. Polstra.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: elf_machdep.c,v 1.4 1998/12/07 21:58:18 archie Exp $
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/namei.h>
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#include <sys/fcntl.h>
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#include <sys/vnode.h>
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#include <sys/linker.h>
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#include <machine/elf.h>
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/* Process one elf relocation with addend. */
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int
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elf_reloc(linker_file_t lf, const void *data, int type, const char *sym)
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{
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Elf_Addr relocbase = (Elf_Addr) lf->address;
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Elf_Addr *where;
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Elf_Addr addr;
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Elf_Addr addend;
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Elf_Word rtype;
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const Elf_Rel *rel;
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const Elf_Rela *rela;
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switch (type) {
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case ELF_RELOC_REL:
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rel = (const Elf_Rel *)data;
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where = (Elf_Addr *) (relocbase + rel->r_offset);
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addend = *where;
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rtype = ELF_R_TYPE(rel->r_info);
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break;
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case ELF_RELOC_RELA:
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rela = (const Elf_Rela *)data;
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where = (Elf_Addr *) (relocbase + rela->r_offset);
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addend = rela->r_addend;
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rtype = ELF_R_TYPE(rela->r_info);
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break;
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default:
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panic("unknown reloc type %d\n", type);
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}
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switch (rtype) {
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case R_386_NONE: /* none */
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break;
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case R_386_32: /* S + A */
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if (sym == NULL)
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return -1;
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addr = (Elf_Addr)linker_file_lookup_symbol(lf, sym, 1);
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if (addr == NULL)
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return -1;
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addr += addend;
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if (*where != addr)
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*where = addr;
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break;
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case R_386_PC32: /* S + A - P */
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if (sym == NULL)
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return -1;
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addr = (Elf_Addr)linker_file_lookup_symbol(lf, sym, 1);
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if (addr == NULL)
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return -1;
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addr += addend - (Elf_Addr)where;
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if (*where != addr)
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*where = addr;
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break;
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case R_386_COPY: /* none */
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/*
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* There shouldn't be copy relocations in kernel
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* objects.
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*/
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printf("kldload: unexpected R_COPY relocation\n");
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return -1;
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break;
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case R_386_GLOB_DAT: /* S */
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if (sym == NULL)
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return -1;
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addr = (Elf_Addr)linker_file_lookup_symbol(lf, sym, 1);
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if (addr == NULL)
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return -1;
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if (*where != addr)
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*where = addr;
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break;
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case R_386_RELATIVE: /* B + A */
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addr = relocbase + addend;
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if (*where != addr)
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*where = addr;
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break;
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default:
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printf("kldload: unexpected relocation type %d\n",
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rtype);
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return -1;
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}
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return(0);
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}
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