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         .sv_size        = SYS_MAXSYSCALL,
   50         .sv_table       = sysent,
   51         .sv_mask        = 0,
   52         .sv_sigsize     = 0,
   53         .sv_sigtbl      = NULL,
   54         .sv_errsize     = 0,
   55         .sv_errtbl      = NULL,
   56         .sv_transtrap   = NULL,
   57         .sv_fixup       = __elfN(freebsd_fixup),
   58         .sv_sendsig     = sendsig,
   59         .sv_sigcode     = sigcode,
   60         .sv_szsigcode   = &szsigcode,
   61         .sv_prepsyscall = NULL,
   62         .sv_name        = "FreeBSD ELF32",
   63         .sv_coredump    = __elfN(coredump),
   64         .sv_imgact_try  = NULL,
   65         .sv_minsigstksz = MINSIGSTKSZ,
   66         .sv_pagesize    = PAGE_SIZE,
   67         .sv_minuser     = VM_MIN_ADDRESS,
   68         .sv_maxuser     = VM_MAXUSER_ADDRESS,
   69         .sv_usrstack    = USRSTACK,
   70         .sv_psstrings   = PS_STRINGS,
   71         .sv_stackprot   = VM_PROT_ALL,
   72         .sv_copyout_strings     = exec_copyout_strings,
   73         .sv_setregs     = exec_setregs,
   74         .sv_fixlimit    = NULL,
   75         .sv_maxssiz     = NULL
   76 };
   77 
   78 static Elf32_Brandinfo freebsd_brand_info = {
   79         .brand          = ELFOSABI_FREEBSD,
   80         .machine        = EM_386,
   81         .compat_3_brand = "FreeBSD",
   82         .emul_path      = NULL,
   83         .interp_path    = "/libexec/ld-elf.so.1",
   84         .sysvec         = &elf32_freebsd_sysvec,
   85         .interp_newpath = NULL,
   86         .brand_note     = &elf32_freebsd_brandnote,
   87         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
   88 };
   89 
   90 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY,
   91         (sysinit_cfunc_t) elf32_insert_brand_entry,
   92         &freebsd_brand_info);
   93 
   94 static Elf32_Brandinfo freebsd_brand_oinfo = {
   95         .brand          = ELFOSABI_FREEBSD,
   96         .machine        = EM_386,
   97         .compat_3_brand = "FreeBSD",
   98         .emul_path      = NULL,
   99         .interp_path    = "/usr/libexec/ld-elf.so.1",
  100         .sysvec         = &elf32_freebsd_sysvec,
  101         .interp_newpath = NULL,
  102         .brand_note     = &elf32_freebsd_brandnote,
  103         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  104 };
  105 
  106 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
  107         (sysinit_cfunc_t) elf32_insert_brand_entry,
  108         &freebsd_brand_oinfo);
  109 
  110 
  111 void
  112 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
  113     size_t *off __unused)
  114 {
  115 }
  116 
  117 
  118 /* Process one elf relocation with addend. */
  119 static int
  120 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  121     int type, int local, elf_lookup_fn lookup)
  122 {
  123         Elf_Addr *where;
  124         Elf_Addr addr;
  125         Elf_Addr addend;
  126         Elf_Word rtype, symidx;
  127         const Elf_Rel *rel;
  128         const Elf_Rela *rela;
  129 
  130         switch (type) {
  131         case ELF_RELOC_REL:
  132                 rel = (const Elf_Rel *)data;
  133                 where = (Elf_Addr *) (relocbase + rel->r_offset);
  134                 addend = *where;
  135                 rtype = ELF_R_TYPE(rel->r_info);
  136                 symidx = ELF_R_SYM(rel->r_info);
  137                 break;
  138         case ELF_RELOC_RELA:
  139                 rela = (const Elf_Rela *)data;
  140                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  141                 addend = rela->r_addend;
  142                 rtype = ELF_R_TYPE(rela->r_info);
  143                 symidx = ELF_R_SYM(rela->r_info);
  144                 break;
  145         default:
  146                 panic("unknown reloc type %d\n", type);
  147         }
  148 
  149         if (local) {
  150                 if (rtype == R_386_RELATIVE) {  /* A + B */
  151                         addr = relocbase + addend;
  152                         if (*where != addr)
  153                                 *where = addr;
  154                 }
  155                 return (0);
  156         }
  157 
  158         switch (rtype) {
  159 
  160                 case R_386_NONE:        /* none */
  161                         break;
  162 
  163                 case R_386_32:          /* S + A */
  164                         addr = lookup(lf, symidx, 1);
  165                         if (addr == 0)
  166                                 return -1;
  167                         addr += addend;
  168                         if (*where != addr)
  169                                 *where = addr;
  170                         break;
  171 
  172                 case R_386_PC32:        /* S + A - P */
  173                         addr = lookup(lf, symidx, 1);
  174                         if (addr == 0)
  175                                 return -1;
  176                         addr += addend - (Elf_Addr)where;
  177                         if (*where != addr)
  178                                 *where = addr;
  179                         break;
  180 
  181                 case R_386_COPY:        /* none */
  182                         /*
  183                          * There shouldn't be copy relocations in kernel
  184                          * objects.
  185                          */
  186                         printf("kldload: unexpected R_COPY relocation\n");
  187                         return -1;
  188                         break;
  189 
  190                 case R_386_GLOB_DAT:    /* S */
  191                         addr = lookup(lf, symidx, 1);
  192                         if (addr == 0)
  193                                 return -1;
  194                         if (*where != addr)
  195                                 *where = addr;
  196                         break;
  197 
  198                 case R_386_RELATIVE:
  199                         break;
  200 
  201                 default:
  202                         printf("kldload: unexpected relocation type %d\n",
  203                                rtype);
  204                         return -1;
  205         }
  206         return(0);
  207 }
  208 
  209 int
  210 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  211     elf_lookup_fn lookup)
  212 {
  213 
  214         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  215 }
  216 
  217 int
  218 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  219     int type, elf_lookup_fn lookup)
  220 {
  221 
  222         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  223 }
  224 
  225 int
  226 elf_cpu_load_file(linker_file_t lf __unused)
  227 {
  228 
  229         return (0);
  230 }
  231 
  232 int
  233 elf_cpu_unload_file(linker_file_t lf __unused)
  234 {
  235 
  236         return (0);
  237 }

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