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

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
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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("$FreeBSD$");
   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 elf32_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 ELF32",
   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 Elf32_Brandinfo freebsd_brand_info = {
   78                                                 ELFOSABI_FREEBSD,
   79                                                 EM_386,
   80                                                 "FreeBSD",
   81                                                 NULL,
   82                                                 "/libexec/ld-elf.so.1",
   83                                                 &elf32_freebsd_sysvec,
   84                                                 NULL,
   85                                                 BI_CAN_EXEC_DYN,
   86                                           };
   87 
   88 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY,
   89         (sysinit_cfunc_t) elf32_insert_brand_entry,
   90         &freebsd_brand_info);
   91 
   92 static Elf32_Brandinfo freebsd_brand_oinfo = {
   93                                                 ELFOSABI_FREEBSD,
   94                                                 EM_386,
   95                                                 "FreeBSD",
   96                                                 NULL,
   97                                                 "/usr/libexec/ld-elf.so.1",
   98                                                 &elf32_freebsd_sysvec,
   99                                                 NULL,
  100                                                 BI_CAN_EXEC_DYN,
  101                                           };
  102 
  103 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
  104         (sysinit_cfunc_t) elf32_insert_brand_entry,
  105         &freebsd_brand_oinfo);
  106 
  107 
  108 void
  109 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
  110     size_t *off __unused)
  111 {
  112 }
  113 
  114 
  115 /* Process one elf relocation with addend. */
  116 static int
  117 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  118     int type, int local, elf_lookup_fn lookup)
  119 {
  120         Elf_Addr *where;
  121         Elf_Addr addr;
  122         Elf_Addr addend;
  123         Elf_Word rtype, symidx;
  124         const Elf_Rel *rel;
  125         const Elf_Rela *rela;
  126 
  127         switch (type) {
  128         case ELF_RELOC_REL:
  129                 rel = (const Elf_Rel *)data;
  130                 where = (Elf_Addr *) (relocbase + rel->r_offset);
  131                 addend = *where;
  132                 rtype = ELF_R_TYPE(rel->r_info);
  133                 symidx = ELF_R_SYM(rel->r_info);
  134                 break;
  135         case ELF_RELOC_RELA:
  136                 rela = (const Elf_Rela *)data;
  137                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  138                 addend = rela->r_addend;
  139                 rtype = ELF_R_TYPE(rela->r_info);
  140                 symidx = ELF_R_SYM(rela->r_info);
  141                 break;
  142         default:
  143                 panic("unknown reloc type %d\n", type);
  144         }
  145 
  146         if (local) {
  147                 if (rtype == R_386_RELATIVE) {  /* A + B */
  148                         addr = relocbase + addend;
  149                         if (*where != addr)
  150                                 *where = addr;
  151                 }
  152                 return (0);
  153         }
  154 
  155         switch (rtype) {
  156 
  157                 case R_386_NONE:        /* none */
  158                         break;
  159 
  160                 case R_386_32:          /* S + A */
  161                         addr = lookup(lf, symidx, 1);
  162                         if (addr == 0)
  163                                 return -1;
  164                         addr += addend;
  165                         if (*where != addr)
  166                                 *where = addr;
  167                         break;
  168 
  169                 case R_386_PC32:        /* S + A - P */
  170                         addr = lookup(lf, symidx, 1);
  171                         if (addr == 0)
  172                                 return -1;
  173                         addr += addend - (Elf_Addr)where;
  174                         if (*where != addr)
  175                                 *where = addr;
  176                         break;
  177 
  178                 case R_386_COPY:        /* none */
  179                         /*
  180                          * There shouldn't be copy relocations in kernel
  181                          * objects.
  182                          */
  183                         printf("kldload: unexpected R_COPY relocation\n");
  184                         return -1;
  185                         break;
  186 
  187                 case R_386_GLOB_DAT:    /* S */
  188                         addr = lookup(lf, symidx, 1);
  189                         if (addr == 0)
  190                                 return -1;
  191                         if (*where != addr)
  192                                 *where = addr;
  193                         break;
  194 
  195                 case R_386_RELATIVE:
  196                         break;
  197 
  198                 default:
  199                         printf("kldload: unexpected relocation type %d\n",
  200                                rtype);
  201                         return -1;
  202         }
  203         return(0);
  204 }
  205 
  206 int
  207 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  208     elf_lookup_fn lookup)
  209 {
  210 
  211         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  212 }
  213 
  214 int
  215 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  216     int type, elf_lookup_fn lookup)
  217 {
  218 
  219         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  220 }
  221 
  222 int
  223 elf_cpu_load_file(linker_file_t lf __unused)
  224 {
  225 
  226         return (0);
  227 }
  228 
  229 int
  230 elf_cpu_unload_file(linker_file_t lf __unused)
  231 {
  232 
  233         return (0);
  234 }

Cache object: 73cb456c5a470dc105259b01a19f22ed


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