elf_machdep.c

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    1 /*-
    2  * Copyright 1996-1998 John D. Polstra.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   24  *
   25  * $FreeBSD$
   26  */
   27 
   28 #include <sys/param.h>
   29 #include <sys/kernel.h>
   30 #include <sys/systm.h>
   31 #include <sys/malloc.h>
   32 #include <sys/proc.h>
   33 #include <sys/namei.h>
   34 #include <sys/fcntl.h>
   35 #include <sys/vnode.h>
   36 #include <sys/linker.h>
   37 #include <machine/elf.h>
   38 
   39 /* Process one elf relocation with addend. */
   40 int
   41 elf_reloc(linker_file_t lf, const void *data, int type, const char *sym)
   42 {
   43         Elf_Addr relocbase = (Elf_Addr) lf->address;
   44         Elf_Addr *where;
   45         Elf_Addr addr;
   46         Elf_Addr addend;
   47         Elf_Word rtype;
   48         const Elf_Rel *rel;
   49         const Elf_Rela *rela;
   50 
   51         switch (type) {
   52         case ELF_RELOC_REL:
   53                 rel = (Elf_Rel *)data;
   54                 where = (Elf_Addr *) (relocbase + rel->r_offset);
   55                 addend = *where;
   56                 rtype = ELF_R_TYPE(rel->r_info);
   57                 break;
   58         case ELF_RELOC_RELA:
   59                 rela = (Elf_Rela *)data;
   60                 where = (Elf_Addr *) (relocbase + rela->r_offset);
   61                 addend = rela->r_addend;
   62                 rtype = ELF_R_TYPE(rela->r_info);
   63                 break;
   64         default:
   65                 panic("unknown reloc type %d\n", type);
   66         }
   67 
   68         switch (rtype) {
   69 
   70                 case R_386_NONE:        /* none */
   71                         break;
   72 
   73                 case R_386_32:          /* S + A */
   74                         if (sym == NULL)
   75                                 return -1;
   76                         addr = (Elf_Addr)linker_file_lookup_symbol(lf, sym, 1);
   77                         if (addr == NULL)
   78                                 return -1;
   79                         addr += addend;
   80                         if (*where != addr)
   81                                 *where = addr;
   82                         break;
   83 
   84                 case R_386_PC32:        /* S + A - P */
   85                         if (sym == NULL)
   86                                 return -1;
   87                         addr = (Elf_Addr)linker_file_lookup_symbol(lf, sym, 1);
   88                         if (addr == NULL)
   89                                 return -1;
   90                         addr += addend - (Elf_Addr)where;
   91                         if (*where != addr)
   92                                 *where = addr;
   93                         break;
   94 
   95                 case R_386_COPY:        /* none */
   96                         /*
   97                          * There shouldn't be copy relocations in kernel
   98                          * objects.
   99                          */
  100                         printf("kldload: unexpected R_COPY relocation\n");
  101                         return -1;
  102                         break;
  103 
  104                 case R_386_GLOB_DAT:    /* S */
  105                         if (sym == NULL)
  106                                 return -1;
  107                         addr = (Elf_Addr)linker_file_lookup_symbol(lf, sym, 1);
  108                         if (addr == NULL)
  109                                 return -1;
  110                         if (*where != addr)
  111                                 *where = addr;
  112                         break;
  113 
  114                 case R_386_RELATIVE:    /* B + A */
  115                         addr = relocbase + addend;
  116                         if (*where != addr)
  117                                 *where = addr;
  118                         break;
  119 
  120                 default:
  121                         printf("kldload: unexpected relocation type %d\n",
  122                                rtype);
  123                         return -1;
  124         }
  125         return(0);
  126 }

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FreeBSD/Linux Kernel Cross Reference sys/i386/i386/elf_machdep.c

FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/elf_machdep.c