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("$FreeBSD$");
   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         .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 ELF64",
   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 Elf64_Brandinfo freebsd_brand_info = {
   79         .brand          = ELFOSABI_FREEBSD,
   80         .machine        = EM_X86_64,
   81         .compat_3_brand = "FreeBSD",
   82         .emul_path      = NULL,
   83         .interp_path    = "/libexec/ld-elf.so.1",
   84         .sysvec         = &elf64_freebsd_sysvec,
   85         .interp_newpath = NULL,
   86         .brand_note     = &elf64_freebsd_brandnote,
   87         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
   88 };
   89 
   90 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY,
   91         (sysinit_cfunc_t) elf64_insert_brand_entry,
   92         &freebsd_brand_info);
   93 
   94 static Elf64_Brandinfo freebsd_brand_oinfo = {
   95         .brand          = ELFOSABI_FREEBSD,
   96         .machine        = EM_X86_64,
   97         .compat_3_brand = "FreeBSD",
   98         .emul_path      = NULL,
   99         .interp_path    = "/usr/libexec/ld-elf.so.1",
  100         .sysvec         = &elf64_freebsd_sysvec,
  101         .interp_newpath = NULL,
  102         .brand_note     = &elf64_freebsd_brandnote,
  103         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  104 };
  105 
  106 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
  107         (sysinit_cfunc_t) elf64_insert_brand_entry,
  108         &freebsd_brand_oinfo);
  109 
  110 
  111 void
  112 elf64_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         Elf64_Addr *where, val;
  124         Elf32_Addr *where32, val32;
  125         Elf_Addr addr;
  126         Elf_Addr addend;
  127         Elf_Size rtype, symidx;
  128         const Elf_Rel *rel;
  129         const Elf_Rela *rela;
  130 
  131         switch (type) {
  132         case ELF_RELOC_REL:
  133                 rel = (const Elf_Rel *)data;
  134                 where = (Elf_Addr *) (relocbase + rel->r_offset);
  135                 rtype = ELF_R_TYPE(rel->r_info);
  136                 symidx = ELF_R_SYM(rel->r_info);
  137                 /* Addend is 32 bit on 32 bit relocs */
  138                 switch (rtype) {
  139                 case R_X86_64_PC32:
  140                 case R_X86_64_32S:
  141                         addend = *(Elf32_Addr *)where;
  142                         break;
  143                 default:
  144                         addend = *where;
  145                         break;
  146                 }
  147                 break;
  148         case ELF_RELOC_RELA:
  149                 rela = (const Elf_Rela *)data;
  150                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  151                 addend = rela->r_addend;
  152                 rtype = ELF_R_TYPE(rela->r_info);
  153                 symidx = ELF_R_SYM(rela->r_info);
  154                 break;
  155         default:
  156                 panic("unknown reloc type %d\n", type);
  157         }
  158 
  159         switch (rtype) {
  160 
  161                 case R_X86_64_NONE:     /* none */
  162                         break;
  163 
  164                 case R_X86_64_64:               /* S + A */
  165                         addr = lookup(lf, symidx, 1);
  166                         val = addr + addend;
  167                         if (addr == 0)
  168                                 return -1;
  169                         if (*where != val)
  170                                 *where = val;
  171                         break;
  172 
  173                 case R_X86_64_PC32:     /* S + A - P */
  174                         addr = lookup(lf, symidx, 1);
  175                         where32 = (Elf32_Addr *)where;
  176                         val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
  177                         if (addr == 0)
  178                                 return -1;
  179                         if (*where32 != val32)
  180                                 *where32 = val32;
  181                         break;
  182 
  183                 case R_X86_64_32S:      /* S + A sign extend */
  184                         addr = lookup(lf, symidx, 1);
  185                         val32 = (Elf32_Addr)(addr + addend);
  186                         where32 = (Elf32_Addr *)where;
  187                         if (addr == 0)
  188                                 return -1;
  189                         if (*where32 != val32)
  190                                 *where32 = val32;
  191                         break;
  192 
  193                 case R_X86_64_COPY:     /* none */
  194                         /*
  195                          * There shouldn't be copy relocations in kernel
  196                          * objects.
  197                          */
  198                         printf("kldload: unexpected R_COPY relocation\n");
  199                         return -1;
  200                         break;
  201 
  202                 case R_X86_64_GLOB_DAT: /* S */
  203                 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
  204                         addr = lookup(lf, symidx, 1);
  205                         if (addr == 0)
  206                                 return -1;
  207                         if (*where != addr)
  208                                 *where = addr;
  209                         break;
  210 
  211                 case R_X86_64_RELATIVE: /* B + A */
  212                         addr = relocbase + addend;
  213                         val = addr;
  214                         if (*where != val)
  215                                 *where = val;
  216                         break;
  217 
  218                 default:
  219                         printf("kldload: unexpected relocation type %ld\n",
  220                                rtype);
  221                         return -1;
  222         }
  223         return(0);
  224 }
  225 
  226 int
  227 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  228     elf_lookup_fn lookup)
  229 {
  230 
  231         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  232 }
  233 
  234 int
  235 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  236     int type, elf_lookup_fn lookup)
  237 {
  238 
  239         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  240 }
  241 
  242 int
  243 elf_cpu_load_file(linker_file_t lf __unused)
  244 {
  245 
  246         return (0);
  247 }
  248 
  249 int
  250 elf_cpu_unload_file(linker_file_t lf __unused)
  251 {
  252 
  253         return (0);
  254 }

Cache object: 339e2cba905e31f270a5e3868d041980


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