The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/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/systm.h>
   30 #include <sys/linker.h>
   31 #include <machine/elf.h>
   32 
   33 /* Process one elf relocation with addend. */
   34 int
   35 elf_reloc(linker_file_t lf, const void *data, int type, const char *sym)
   36 {
   37         Elf_Addr relocbase = (Elf_Addr) lf->address;
   38         Elf_Addr *where;
   39         Elf_Addr addr;
   40         Elf_Addr addend;
   41         Elf_Word rtype;
   42         const Elf_Rel *rel;
   43         const Elf_Rela *rela;
   44 
   45         switch (type) {
   46         case ELF_RELOC_REL:
   47                 rel = (const Elf_Rel *)data;
   48                 where = (Elf_Addr *) (relocbase + rel->r_offset);
   49                 addend = *where;
   50                 rtype = ELF_R_TYPE(rel->r_info);
   51                 break;
   52         case ELF_RELOC_RELA:
   53                 rela = (const Elf_Rela *)data;
   54                 where = (Elf_Addr *) (relocbase + rela->r_offset);
   55                 addend = rela->r_addend;
   56                 rtype = ELF_R_TYPE(rela->r_info);
   57                 break;
   58         default:
   59                 panic("unknown reloc type %d\n", type);
   60         }
   61 
   62         switch (rtype) {
   63 
   64                 case R_386_NONE:        /* none */
   65                         break;
   66 
   67                 case R_386_32:          /* S + A */
   68                         if (sym == NULL)
   69                                 return -1;
   70                         addr = (Elf_Addr)linker_file_lookup_symbol(lf, sym, 1);
   71                         if (addr == 0)
   72                                 return -1;
   73                         addr += addend;
   74                         if (*where != addr)
   75                                 *where = addr;
   76                         break;
   77 
   78                 case R_386_PC32:        /* S + A - P */
   79                         if (sym == NULL)
   80                                 return -1;
   81                         addr = (Elf_Addr)linker_file_lookup_symbol(lf, sym, 1);
   82                         if (addr == 0)
   83                                 return -1;
   84                         addr += addend - (Elf_Addr)where;
   85                         if (*where != addr)
   86                                 *where = addr;
   87                         break;
   88 
   89                 case R_386_COPY:        /* none */
   90                         /*
   91                          * There shouldn't be copy relocations in kernel
   92                          * objects.
   93                          */
   94                         printf("kldload: unexpected R_COPY relocation\n");
   95                         return -1;
   96                         break;
   97 
   98                 case R_386_GLOB_DAT:    /* S */
   99                         if (sym == NULL)
  100                                 return -1;
  101                         addr = (Elf_Addr)linker_file_lookup_symbol(lf, sym, 1);
  102                         if (addr == 0)
  103                                 return -1;
  104                         if (*where != addr)
  105                                 *where = addr;
  106                         break;
  107 
  108                 case R_386_RELATIVE:    /* B + A */
  109                         addr = relocbase + addend;
  110                         if (*where != addr)
  111                                 *where = addr;
  112                         break;
  113 
  114                 default:
  115                         printf("kldload: unexpected relocation type %d\n",
  116                                rtype);
  117                         return -1;
  118         }
  119         return(0);
  120 }

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