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/amd64/amd64/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 
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/5.2/sys/amd64/amd64/elf_machdep.c 120422 2003-09-25 01:10:26Z peter $");
   28 
   29 #include <sys/param.h>
   30 #include <sys/kernel.h>
   31 #include <sys/systm.h>
   32 #include <sys/exec.h>
   33 #include <sys/imgact.h>
   34 #include <sys/linker.h>
   35 #include <sys/sysent.h>
   36 #include <sys/imgact_elf.h>
   37 #include <sys/syscall.h>
   38 #include <sys/signalvar.h>
   39 #include <sys/vnode.h>
   40 
   41 #include <vm/vm.h>
   42 #include <vm/pmap.h>
   43 #include <vm/vm_param.h>
   44 
   45 #include <machine/elf.h>
   46 #include <machine/md_var.h>
   47 
   48 struct sysentvec elf64_freebsd_sysvec = {
   49         SYS_MAXSYSCALL,
   50         sysent,
   51         0,
   52         0,
   53         NULL,
   54         0,
   55         NULL,
   56         NULL,
   57         __elfN(freebsd_fixup),
   58         sendsig,
   59         sigcode,
   60         &szsigcode,
   61         NULL,
   62         "FreeBSD ELF64",
   63         __elfN(coredump),
   64         NULL,
   65         MINSIGSTKSZ,
   66         PAGE_SIZE,
   67         VM_MIN_ADDRESS,
   68         VM_MAXUSER_ADDRESS,
   69         USRSTACK,
   70         PS_STRINGS,
   71         VM_PROT_ALL,
   72         exec_copyout_strings,
   73         exec_setregs,
   74         NULL
   75 };
   76 
   77 static Elf64_Brandinfo freebsd_brand_info = {
   78                                                 ELFOSABI_FREEBSD,
   79                                                 EM_X86_64,
   80                                                 "FreeBSD",
   81                                                 "",
   82                                                 "/libexec/ld-elf.so.1",
   83                                                 &elf64_freebsd_sysvec
   84                                           };
   85 
   86 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY,
   87         (sysinit_cfunc_t) elf64_insert_brand_entry,
   88         &freebsd_brand_info);
   89 
   90 /* Process one elf relocation with addend. */
   91 static int
   92 elf_reloc_internal(linker_file_t lf, const void *data, int type, int local)
   93 {
   94         Elf_Addr relocbase = (Elf_Addr) lf->address;
   95         Elf_Addr *where;
   96         Elf_Addr addr;
   97         Elf_Addr addend;
   98         Elf_Word rtype, symidx;
   99         const Elf_Rel *rel;
  100         const Elf_Rela *rela;
  101 
  102         switch (type) {
  103         case ELF_RELOC_REL:
  104                 rel = (const Elf_Rel *)data;
  105                 where = (Elf_Addr *) (relocbase + rel->r_offset);
  106                 addend = *where;
  107                 rtype = ELF_R_TYPE(rel->r_info);
  108                 symidx = ELF_R_SYM(rel->r_info);
  109                 break;
  110         case ELF_RELOC_RELA:
  111                 rela = (const Elf_Rela *)data;
  112                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  113                 addend = rela->r_addend;
  114                 rtype = ELF_R_TYPE(rela->r_info);
  115                 symidx = ELF_R_SYM(rela->r_info);
  116                 break;
  117         default:
  118                 panic("unknown reloc type %d\n", type);
  119         }
  120 
  121         if (local) {
  122                 if (rtype == R_X86_64_RELATIVE) {       /* A + B */
  123                         addr = relocbase + addend;
  124                         if (*where != addr)
  125                                 *where = addr;
  126                 }
  127                 return (0);
  128         }
  129 
  130         switch (rtype) {
  131 
  132                 case R_X86_64_NONE:     /* none */
  133                         break;
  134 
  135                 case R_X86_64_64:               /* S + A */
  136                         addr = elf_lookup(lf, symidx, 1);
  137                         if (addr == 0)
  138                                 return -1;
  139                         addr += addend;
  140                         if (*where != addr)
  141                                 *where = addr;
  142                         break;
  143 
  144                 case R_X86_64_PC32:     /* S + A - P */
  145                         addr = elf_lookup(lf, symidx, 1);
  146                         if (addr == 0)
  147                                 return -1;
  148                         addr += addend - (Elf_Addr)where;
  149                         /* XXX needs to be 32 bit *where, not 64 bit */
  150                         if (*where != addr)
  151                                 *where = addr;
  152                         break;
  153 
  154                 case R_X86_64_COPY:     /* none */
  155                         /*
  156                          * There shouldn't be copy relocations in kernel
  157                          * objects.
  158                          */
  159                         printf("kldload: unexpected R_COPY relocation\n");
  160                         return -1;
  161                         break;
  162 
  163                 case R_X86_64_GLOB_DAT: /* S */
  164                         addr = elf_lookup(lf, symidx, 1);
  165                         if (addr == 0)
  166                                 return -1;
  167                         if (*where != addr)
  168                                 *where = addr;
  169                         break;
  170 
  171                 case R_X86_64_RELATIVE: /* B + A */
  172                         break;
  173 
  174                 default:
  175                         printf("kldload: unexpected relocation type %ld\n",
  176                                rtype);
  177                         return -1;
  178         }
  179         return(0);
  180 }
  181 
  182 int
  183 elf_reloc(linker_file_t lf, const void *data, int type)
  184 {
  185 
  186         return (elf_reloc_internal(lf, data, type, 0));
  187 }
  188 
  189 int
  190 elf_reloc_local(linker_file_t lf, const void *data, int type)
  191 {
  192 
  193         return (elf_reloc_internal(lf, data, type, 1));
  194 }
  195 
  196 int
  197 elf_cpu_load_file(linker_file_t lf __unused)
  198 {
  199 
  200         return (0);
  201 }
  202 
  203 int
  204 elf_cpu_unload_file(linker_file_t lf __unused)
  205 {
  206 
  207         return (0);
  208 }

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