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 
   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 static Elf32_Brandinfo kfreebsd_brand_info = {
  111         .brand          = ELFOSABI_FREEBSD,
  112         .machine        = EM_386,
  113         .compat_3_brand = "FreeBSD",
  114         .emul_path      = NULL,
  115         .interp_path    = "/lib/ld.so.1",
  116         .sysvec         = &elf32_freebsd_sysvec,
  117         .interp_newpath = NULL,
  118         .brand_note     = &elf32_kfreebsd_brandnote,
  119         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
  120 };
  121 
  122 SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY,
  123         (sysinit_cfunc_t) elf32_insert_brand_entry,
  124         &kfreebsd_brand_info);
  125 
  126 
  127 void
  128 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
  129     size_t *off __unused)
  130 {
  131 }
  132 
  133 
  134 /* Process one elf relocation with addend. */
  135 static int
  136 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  137     int type, int local, elf_lookup_fn lookup)
  138 {
  139         Elf_Addr *where;
  140         Elf_Addr addr;
  141         Elf_Addr addend;
  142         Elf_Word rtype, symidx;
  143         const Elf_Rel *rel;
  144         const Elf_Rela *rela;
  145 
  146         switch (type) {
  147         case ELF_RELOC_REL:
  148                 rel = (const Elf_Rel *)data;
  149                 where = (Elf_Addr *) (relocbase + rel->r_offset);
  150                 addend = *where;
  151                 rtype = ELF_R_TYPE(rel->r_info);
  152                 symidx = ELF_R_SYM(rel->r_info);
  153                 break;
  154         case ELF_RELOC_RELA:
  155                 rela = (const Elf_Rela *)data;
  156                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  157                 addend = rela->r_addend;
  158                 rtype = ELF_R_TYPE(rela->r_info);
  159                 symidx = ELF_R_SYM(rela->r_info);
  160                 break;
  161         default:
  162                 panic("unknown reloc type %d\n", type);
  163         }
  164 
  165         if (local) {
  166                 if (rtype == R_386_RELATIVE) {  /* A + B */
  167                         addr = relocbase + addend;
  168                         if (*where != addr)
  169                                 *where = addr;
  170                 }
  171                 return (0);
  172         }
  173 
  174         switch (rtype) {
  175 
  176                 case R_386_NONE:        /* none */
  177                         break;
  178 
  179                 case R_386_32:          /* S + A */
  180                         addr = lookup(lf, symidx, 1);
  181                         if (addr == 0)
  182                                 return -1;
  183                         addr += addend;
  184                         if (*where != addr)
  185                                 *where = addr;
  186                         break;
  187 
  188                 case R_386_PC32:        /* S + A - P */
  189                         addr = lookup(lf, symidx, 1);
  190                         if (addr == 0)
  191                                 return -1;
  192                         addr += addend - (Elf_Addr)where;
  193                         if (*where != addr)
  194                                 *where = addr;
  195                         break;
  196 
  197                 case R_386_COPY:        /* none */
  198                         /*
  199                          * There shouldn't be copy relocations in kernel
  200                          * objects.
  201                          */
  202                         printf("kldload: unexpected R_COPY relocation\n");
  203                         return -1;
  204                         break;
  205 
  206                 case R_386_GLOB_DAT:    /* S */
  207                         addr = lookup(lf, symidx, 1);
  208                         if (addr == 0)
  209                                 return -1;
  210                         if (*where != addr)
  211                                 *where = addr;
  212                         break;
  213 
  214                 case R_386_RELATIVE:
  215                         break;
  216 
  217                 default:
  218                         printf("kldload: unexpected relocation type %d\n",
  219                                rtype);
  220                         return -1;
  221         }
  222         return(0);
  223 }
  224 
  225 int
  226 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  227     elf_lookup_fn lookup)
  228 {
  229 
  230         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  231 }
  232 
  233 int
  234 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  235     int type, elf_lookup_fn lookup)
  236 {
  237 
  238         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  239 }
  240 
  241 int
  242 elf_cpu_load_file(linker_file_t lf __unused)
  243 {
  244 
  245         return (0);
  246 }
  247 
  248 int
  249 elf_cpu_unload_file(linker_file_t lf __unused)
  250 {
  251 
  252         return (0);
  253 }

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