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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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 
SearchContext: -  none  -  3  -  10 

    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/proc.h>
   36 #include <sys/sysent.h>
   37 #include <sys/imgact_elf.h>
   38 #include <sys/syscall.h>
   39 #include <sys/signalvar.h>
   40 #include <sys/vnode.h>
   41 
   42 #include <vm/vm.h>
   43 #include <vm/pmap.h>
   44 #include <vm/vm_param.h>
   45 
   46 #include <machine/elf.h>
   47 #include <machine/md_var.h>
   48 
   49 struct sysentvec elf32_freebsd_sysvec = {
   50         .sv_size        = SYS_MAXSYSCALL,
   51         .sv_table       = sysent,
   52         .sv_mask        = 0,
   53         .sv_sigsize     = 0,
   54         .sv_sigtbl      = NULL,
   55         .sv_errsize     = 0,
   56         .sv_errtbl      = NULL,
   57         .sv_transtrap   = NULL,
   58         .sv_fixup       = __elfN(freebsd_fixup),
   59         .sv_sendsig     = sendsig,
   60         .sv_sigcode     = sigcode,
   61         .sv_szsigcode   = &szsigcode,
   62         .sv_prepsyscall = NULL,
   63         .sv_name        = "FreeBSD ELF32",
   64         .sv_coredump    = __elfN(coredump),
   65         .sv_imgact_try  = NULL,
   66         .sv_minsigstksz = MINSIGSTKSZ,
   67         .sv_pagesize    = PAGE_SIZE,
   68         .sv_minuser     = VM_MIN_ADDRESS,
   69         .sv_maxuser     = VM_MAXUSER_ADDRESS,
   70         .sv_usrstack    = USRSTACK,
   71         .sv_psstrings   = PS_STRINGS,
   72         .sv_stackprot   = VM_PROT_ALL,
   73         .sv_copyout_strings     = exec_copyout_strings,
   74         .sv_setregs     = exec_setregs,
   75         .sv_fixlimit    = NULL,
   76         .sv_maxssiz     = NULL,
   77         .sv_flags       = SV_ABI_FREEBSD | SV_IA32 | SV_ILP32 | SV_SHP,
   78         .sv_set_syscall_retval = cpu_set_syscall_retval,
   79         .sv_fetch_syscall_args = cpu_fetch_syscall_args,
   80         .sv_syscallnames = syscallnames,
   81         .sv_shared_page_base = SHAREDPAGE,
   82         .sv_shared_page_len = PAGE_SIZE,
   83         .sv_schedtail   = NULL,
   84 };
   85 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
   86 
   87 static Elf32_Brandinfo freebsd_brand_info = {
   88         .brand          = ELFOSABI_FREEBSD,
   89         .machine        = EM_386,
   90         .compat_3_brand = "FreeBSD",
   91         .emul_path      = NULL,
   92         .interp_path    = "/libexec/ld-elf.so.1",
   93         .sysvec         = &elf32_freebsd_sysvec,
   94         .interp_newpath = NULL,
   95         .brand_note     = &elf32_freebsd_brandnote,
   96         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
   97 };
   98 
   99 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
  100         (sysinit_cfunc_t) elf32_insert_brand_entry,
  101         &freebsd_brand_info);
  102 
  103 static Elf32_Brandinfo freebsd_brand_oinfo = {
  104         .brand          = ELFOSABI_FREEBSD,
  105         .machine        = EM_386,
  106         .compat_3_brand = "FreeBSD",
  107         .emul_path      = NULL,
  108         .interp_path    = "/usr/libexec/ld-elf.so.1",
  109         .sysvec         = &elf32_freebsd_sysvec,
  110         .interp_newpath = NULL,
  111         .brand_note     = &elf32_freebsd_brandnote,
  112         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  113 };
  114 
  115 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
  116         (sysinit_cfunc_t) elf32_insert_brand_entry,
  117         &freebsd_brand_oinfo);
  118 
  119 static Elf32_Brandinfo kfreebsd_brand_info = {
  120         .brand          = ELFOSABI_FREEBSD,
  121         .machine        = EM_386,
  122         .compat_3_brand = "FreeBSD",
  123         .emul_path      = NULL,
  124         .interp_path    = "/lib/ld.so.1",
  125         .sysvec         = &elf32_freebsd_sysvec,
  126         .interp_newpath = NULL,
  127         .brand_note     = &elf32_kfreebsd_brandnote,
  128         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
  129 };
  130 
  131 SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY,
  132         (sysinit_cfunc_t) elf32_insert_brand_entry,
  133         &kfreebsd_brand_info);
  134 
  135 
  136 void
  137 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
  138     size_t *off __unused)
  139 {
  140 }
  141 
  142 
  143 /* Process one elf relocation with addend. */
  144 static int
  145 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  146     int type, int local, elf_lookup_fn lookup)
  147 {
  148         Elf_Addr *where;
  149         Elf_Addr addr;
  150         Elf_Addr addend;
  151         Elf_Word rtype, symidx;
  152         const Elf_Rel *rel;
  153         const Elf_Rela *rela;
  154 
  155         switch (type) {
  156         case ELF_RELOC_REL:
  157                 rel = (const Elf_Rel *)data;
  158                 where = (Elf_Addr *) (relocbase + rel->r_offset);
  159                 addend = *where;
  160                 rtype = ELF_R_TYPE(rel->r_info);
  161                 symidx = ELF_R_SYM(rel->r_info);
  162                 break;
  163         case ELF_RELOC_RELA:
  164                 rela = (const Elf_Rela *)data;
  165                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  166                 addend = rela->r_addend;
  167                 rtype = ELF_R_TYPE(rela->r_info);
  168                 symidx = ELF_R_SYM(rela->r_info);
  169                 break;
  170         default:
  171                 panic("unknown reloc type %d\n", type);
  172         }
  173 
  174         if (local) {
  175                 if (rtype == R_386_RELATIVE) {  /* A + B */
  176                         addr = elf_relocaddr(lf, relocbase + addend);
  177                         if (*where != addr)
  178                                 *where = addr;
  179                 }
  180                 return (0);
  181         }
  182 
  183         switch (rtype) {
  184 
  185                 case R_386_NONE:        /* none */
  186                         break;
  187 
  188                 case R_386_32:          /* S + A */
  189                         addr = lookup(lf, symidx, 1);
  190                         if (addr == 0)
  191                                 return -1;
  192                         addr += addend;
  193                         if (*where != addr)
  194                                 *where = addr;
  195                         break;
  196 
  197                 case R_386_PC32:        /* S + A - P */
  198                         addr = lookup(lf, symidx, 1);
  199                         if (addr == 0)
  200                                 return -1;
  201                         addr += addend - (Elf_Addr)where;
  202                         if (*where != addr)
  203                                 *where = addr;
  204                         break;
  205 
  206                 case R_386_COPY:        /* none */
  207                         /*
  208                          * There shouldn't be copy relocations in kernel
  209                          * objects.
  210                          */
  211                         printf("kldload: unexpected R_COPY relocation\n");
  212                         return -1;
  213                         break;
  214 
  215                 case R_386_GLOB_DAT:    /* S */
  216                         addr = lookup(lf, symidx, 1);
  217                         if (addr == 0)
  218                                 return -1;
  219                         if (*where != addr)
  220                                 *where = addr;
  221                         break;
  222 
  223                 case R_386_RELATIVE:
  224                         break;
  225 
  226                 default:
  227                         printf("kldload: unexpected relocation type %d\n",
  228                                rtype);
  229                         return -1;
  230         }
  231         return(0);
  232 }
  233 
  234 int
  235 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  236     elf_lookup_fn lookup)
  237 {
  238 
  239         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  240 }
  241 
  242 int
  243 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  244     int type, elf_lookup_fn lookup)
  245 {
  246 
  247         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  248 }
  249 
  250 int
  251 elf_cpu_load_file(linker_file_t lf __unused)
  252 {
  253 
  254         return (0);
  255 }
  256 
  257 int
  258 elf_cpu_unload_file(linker_file_t lf __unused)
  259 {
  260 
  261         return (0);
  262 }

Cache object: f3804c384d232370e34596e8616f8949


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.