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: releng/8.0/sys/amd64/amd64/elf_machdep.c 196761 2009-09-02 10:39:46Z bz $");
   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/sysent.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 elf64_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 ELF64",
   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_LP64
   78 };
   79 
   80 static Elf64_Brandinfo freebsd_brand_info = {
   81         .brand          = ELFOSABI_FREEBSD,
   82         .machine        = EM_X86_64,
   83         .compat_3_brand = "FreeBSD",
   84         .emul_path      = NULL,
   85         .interp_path    = "/libexec/ld-elf.so.1",
   86         .sysvec         = &elf64_freebsd_sysvec,
   87         .interp_newpath = NULL,
   88         .brand_note     = &elf64_freebsd_brandnote,
   89         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
   90 };
   91 
   92 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY,
   93         (sysinit_cfunc_t) elf64_insert_brand_entry,
   94         &freebsd_brand_info);
   95 
   96 static Elf64_Brandinfo freebsd_brand_oinfo = {
   97         .brand          = ELFOSABI_FREEBSD,
   98         .machine        = EM_X86_64,
   99         .compat_3_brand = "FreeBSD",
  100         .emul_path      = NULL,
  101         .interp_path    = "/usr/libexec/ld-elf.so.1",
  102         .sysvec         = &elf64_freebsd_sysvec,
  103         .interp_newpath = NULL,
  104         .brand_note     = &elf64_freebsd_brandnote,
  105         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  106 };
  107 
  108 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
  109         (sysinit_cfunc_t) elf64_insert_brand_entry,
  110         &freebsd_brand_oinfo);
  111 
  112 static Elf64_Brandinfo kfreebsd_brand_info = {
  113         .brand          = ELFOSABI_FREEBSD,
  114         .machine        = EM_X86_64,
  115         .compat_3_brand = "FreeBSD",
  116         .emul_path      = NULL,
  117         .interp_path    = "/lib/ld-kfreebsd-x86-64.so.1",
  118         .sysvec         = &elf64_freebsd_sysvec,
  119         .interp_newpath = NULL,
  120         .brand_note     = &elf64_kfreebsd_brandnote,
  121         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
  122 };
  123 
  124 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY,
  125         (sysinit_cfunc_t) elf64_insert_brand_entry,
  126         &kfreebsd_brand_info);
  127 
  128 
  129 void
  130 elf64_dump_thread(struct thread *td __unused, void *dst __unused,
  131     size_t *off __unused)
  132 {
  133 }
  134 
  135 
  136 /* Process one elf relocation with addend. */
  137 static int
  138 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  139     int type, int local, elf_lookup_fn lookup)
  140 {
  141         Elf64_Addr *where, val;
  142         Elf32_Addr *where32, val32;
  143         Elf_Addr addr;
  144         Elf_Addr addend;
  145         Elf_Size rtype, symidx;
  146         const Elf_Rel *rel;
  147         const Elf_Rela *rela;
  148 
  149         switch (type) {
  150         case ELF_RELOC_REL:
  151                 rel = (const Elf_Rel *)data;
  152                 where = (Elf_Addr *) (relocbase + rel->r_offset);
  153                 rtype = ELF_R_TYPE(rel->r_info);
  154                 symidx = ELF_R_SYM(rel->r_info);
  155                 /* Addend is 32 bit on 32 bit relocs */
  156                 switch (rtype) {
  157                 case R_X86_64_PC32:
  158                 case R_X86_64_32S:
  159                         addend = *(Elf32_Addr *)where;
  160                         break;
  161                 default:
  162                         addend = *where;
  163                         break;
  164                 }
  165                 break;
  166         case ELF_RELOC_RELA:
  167                 rela = (const Elf_Rela *)data;
  168                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  169                 addend = rela->r_addend;
  170                 rtype = ELF_R_TYPE(rela->r_info);
  171                 symidx = ELF_R_SYM(rela->r_info);
  172                 break;
  173         default:
  174                 panic("unknown reloc type %d\n", type);
  175         }
  176 
  177         switch (rtype) {
  178 
  179                 case R_X86_64_NONE:     /* none */
  180                         break;
  181 
  182                 case R_X86_64_64:               /* S + A */
  183                         addr = lookup(lf, symidx, 1);
  184                         val = addr + addend;
  185                         if (addr == 0)
  186                                 return -1;
  187                         if (*where != val)
  188                                 *where = val;
  189                         break;
  190 
  191                 case R_X86_64_PC32:     /* S + A - P */
  192                         addr = lookup(lf, symidx, 1);
  193                         where32 = (Elf32_Addr *)where;
  194                         val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
  195                         if (addr == 0)
  196                                 return -1;
  197                         if (*where32 != val32)
  198                                 *where32 = val32;
  199                         break;
  200 
  201                 case R_X86_64_32S:      /* S + A sign extend */
  202                         addr = lookup(lf, symidx, 1);
  203                         val32 = (Elf32_Addr)(addr + addend);
  204                         where32 = (Elf32_Addr *)where;
  205                         if (addr == 0)
  206                                 return -1;
  207                         if (*where32 != val32)
  208                                 *where32 = val32;
  209                         break;
  210 
  211                 case R_X86_64_COPY:     /* none */
  212                         /*
  213                          * There shouldn't be copy relocations in kernel
  214                          * objects.
  215                          */
  216                         printf("kldload: unexpected R_COPY relocation\n");
  217                         return -1;
  218                         break;
  219 
  220                 case R_X86_64_GLOB_DAT: /* S */
  221                 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
  222                         addr = lookup(lf, symidx, 1);
  223                         if (addr == 0)
  224                                 return -1;
  225                         if (*where != addr)
  226                                 *where = addr;
  227                         break;
  228 
  229                 case R_X86_64_RELATIVE: /* B + A */
  230                         addr = relocbase + addend;
  231                         val = addr;
  232                         if (*where != val)
  233                                 *where = val;
  234                         break;
  235 
  236                 default:
  237                         printf("kldload: unexpected relocation type %ld\n",
  238                                rtype);
  239                         return -1;
  240         }
  241         return(0);
  242 }
  243 
  244 int
  245 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  246     elf_lookup_fn lookup)
  247 {
  248 
  249         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  250 }
  251 
  252 int
  253 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  254     int type, elf_lookup_fn lookup)
  255 {
  256 
  257         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  258 }
  259 
  260 int
  261 elf_cpu_load_file(linker_file_t lf __unused)
  262 {
  263 
  264         return (0);
  265 }
  266 
  267 int
  268 elf_cpu_unload_file(linker_file_t lf __unused)
  269 {
  270 
  271         return (0);
  272 }

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FreeBSD/Linux Kernel Cross Reference sys/amd64/amd64/elf_machdep.c

FreeBSD/Linux Kernel Cross Reference
sys/amd64/amd64/elf_machdep.c