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: stable/8/sys/amd64/amd64/elf_machdep.c 338756 2018-09-18 20:46:55Z dim $");
   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/sysent.h>
   40 #include <sys/signalvar.h>
   41 #include <sys/vnode.h>
   42 
   43 #include <vm/vm.h>
   44 #include <vm/pmap.h>
   45 #include <vm/vm_param.h>
   46 
   47 #include <machine/elf.h>
   48 #include <machine/md_var.h>
   49 
   50 struct sysentvec elf64_freebsd_sysvec = {
   51         .sv_size        = SYS_MAXSYSCALL,
   52         .sv_table       = sysent,
   53         .sv_mask        = 0,
   54         .sv_sigsize     = 0,
   55         .sv_sigtbl      = NULL,
   56         .sv_errsize     = 0,
   57         .sv_errtbl      = NULL,
   58         .sv_transtrap   = NULL,
   59         .sv_fixup       = __elfN(freebsd_fixup),
   60         .sv_sendsig     = sendsig,
   61         .sv_sigcode     = sigcode,
   62         .sv_szsigcode   = &szsigcode,
   63         .sv_prepsyscall = NULL,
   64         .sv_name        = "FreeBSD ELF64",
   65         .sv_coredump    = __elfN(coredump),
   66         .sv_imgact_try  = NULL,
   67         .sv_minsigstksz = MINSIGSTKSZ,
   68         .sv_pagesize    = PAGE_SIZE,
   69         .sv_minuser     = VM_MIN_ADDRESS,
   70         .sv_maxuser     = VM_MAXUSER_ADDRESS,
   71         .sv_usrstack    = USRSTACK,
   72         .sv_psstrings   = PS_STRINGS,
   73         .sv_stackprot   = VM_PROT_ALL,
   74         .sv_copyout_strings     = exec_copyout_strings,
   75         .sv_setregs     = exec_setregs,
   76         .sv_fixlimit    = NULL,
   77         .sv_maxssiz     = NULL,
   78         .sv_flags       = SV_ABI_FREEBSD | SV_LP64,
   79         .sv_set_syscall_retval = cpu_set_syscall_retval,
   80         .sv_fetch_syscall_args = cpu_fetch_syscall_args,
   81         .sv_syscallnames = syscallnames,
   82         .sv_schedtail   = NULL,
   83 };
   84 
   85 static Elf64_Brandinfo freebsd_brand_info = {
   86         .brand          = ELFOSABI_FREEBSD,
   87         .machine        = EM_X86_64,
   88         .compat_3_brand = "FreeBSD",
   89         .emul_path      = NULL,
   90         .interp_path    = "/libexec/ld-elf.so.1",
   91         .sysvec         = &elf64_freebsd_sysvec,
   92         .interp_newpath = NULL,
   93         .brand_note     = &elf64_freebsd_brandnote,
   94         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
   95 };
   96 
   97 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
   98         (sysinit_cfunc_t) elf64_insert_brand_entry,
   99         &freebsd_brand_info);
  100 
  101 static Elf64_Brandinfo freebsd_brand_oinfo = {
  102         .brand          = ELFOSABI_FREEBSD,
  103         .machine        = EM_X86_64,
  104         .compat_3_brand = "FreeBSD",
  105         .emul_path      = NULL,
  106         .interp_path    = "/usr/libexec/ld-elf.so.1",
  107         .sysvec         = &elf64_freebsd_sysvec,
  108         .interp_newpath = NULL,
  109         .brand_note     = &elf64_freebsd_brandnote,
  110         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  111 };
  112 
  113 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
  114         (sysinit_cfunc_t) elf64_insert_brand_entry,
  115         &freebsd_brand_oinfo);
  116 
  117 static Elf64_Brandinfo kfreebsd_brand_info = {
  118         .brand          = ELFOSABI_FREEBSD,
  119         .machine        = EM_X86_64,
  120         .compat_3_brand = "FreeBSD",
  121         .emul_path      = NULL,
  122         .interp_path    = "/lib/ld-kfreebsd-x86-64.so.1",
  123         .sysvec         = &elf64_freebsd_sysvec,
  124         .interp_newpath = NULL,
  125         .brand_note     = &elf64_kfreebsd_brandnote,
  126         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
  127 };
  128 
  129 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY,
  130         (sysinit_cfunc_t) elf64_insert_brand_entry,
  131         &kfreebsd_brand_info);
  132 
  133 
  134 void
  135 elf64_dump_thread(struct thread *td __unused, void *dst __unused,
  136     size_t *off __unused)
  137 {
  138 }
  139 
  140 
  141 /* Process one elf relocation with addend. */
  142 static int
  143 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  144     int type, int local, elf_lookup_fn lookup)
  145 {
  146         Elf64_Addr *where, val;
  147         Elf32_Addr *where32, val32;
  148         Elf_Addr addr;
  149         Elf_Addr addend;
  150         Elf_Size rtype, symidx;
  151         const Elf_Rel *rel;
  152         const Elf_Rela *rela;
  153 
  154         switch (type) {
  155         case ELF_RELOC_REL:
  156                 rel = (const Elf_Rel *)data;
  157                 where = (Elf_Addr *) (relocbase + rel->r_offset);
  158                 rtype = ELF_R_TYPE(rel->r_info);
  159                 symidx = ELF_R_SYM(rel->r_info);
  160                 /* Addend is 32 bit on 32 bit relocs */
  161                 switch (rtype) {
  162                 case R_X86_64_PC32:
  163                 case R_X86_64_32S:
  164                 case R_X86_64_PLT32:
  165                         addend = *(Elf32_Addr *)where;
  166                         break;
  167                 default:
  168                         addend = *where;
  169                         break;
  170                 }
  171                 break;
  172         case ELF_RELOC_RELA:
  173                 rela = (const Elf_Rela *)data;
  174                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  175                 addend = rela->r_addend;
  176                 rtype = ELF_R_TYPE(rela->r_info);
  177                 symidx = ELF_R_SYM(rela->r_info);
  178                 break;
  179         default:
  180                 panic("unknown reloc type %d\n", type);
  181         }
  182 
  183         switch (rtype) {
  184 
  185                 case R_X86_64_NONE:     /* none */
  186                         break;
  187 
  188                 case R_X86_64_64:               /* S + A */
  189                         addr = lookup(lf, symidx, 1);
  190                         val = addr + addend;
  191                         if (addr == 0)
  192                                 return -1;
  193                         if (*where != val)
  194                                 *where = val;
  195                         break;
  196 
  197                 case R_X86_64_PC32:     /* S + A - P */
  198                 case R_X86_64_PLT32:    /* L + A - P, L is PLT location for
  199                                            the symbol, which we treat as S */
  200                         addr = lookup(lf, symidx, 1);
  201                         where32 = (Elf32_Addr *)where;
  202                         val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
  203                         if (addr == 0)
  204                                 return -1;
  205                         if (*where32 != val32)
  206                                 *where32 = val32;
  207                         break;
  208 
  209                 case R_X86_64_32S:      /* S + A sign extend */
  210                         addr = lookup(lf, symidx, 1);
  211                         val32 = (Elf32_Addr)(addr + addend);
  212                         where32 = (Elf32_Addr *)where;
  213                         if (addr == 0)
  214                                 return -1;
  215                         if (*where32 != val32)
  216                                 *where32 = val32;
  217                         break;
  218 
  219                 case R_X86_64_COPY:     /* none */
  220                         /*
  221                          * There shouldn't be copy relocations in kernel
  222                          * objects.
  223                          */
  224                         printf("kldload: unexpected R_COPY relocation\n");
  225                         return -1;
  226                         break;
  227 
  228                 case R_X86_64_GLOB_DAT: /* S */
  229                 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
  230                         addr = lookup(lf, symidx, 1);
  231                         if (addr == 0)
  232                                 return -1;
  233                         if (*where != addr)
  234                                 *where = addr;
  235                         break;
  236 
  237                 case R_X86_64_RELATIVE: /* B + A */
  238                         addr = relocbase + addend;
  239                         val = addr;
  240                         if (*where != val)
  241                                 *where = val;
  242                         break;
  243 
  244                 default:
  245                         printf("kldload: unexpected relocation type %ld\n",
  246                                rtype);
  247                         return -1;
  248         }
  249         return(0);
  250 }
  251 
  252 int
  253 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  254     elf_lookup_fn lookup)
  255 {
  256 
  257         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  258 }
  259 
  260 int
  261 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  262     int type, elf_lookup_fn lookup)
  263 {
  264 
  265         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  266 }
  267 
  268 int
  269 elf_cpu_load_file(linker_file_t lf __unused)
  270 {
  271 
  272         return (0);
  273 }
  274 
  275 int
  276 elf_cpu_unload_file(linker_file_t lf __unused)
  277 {
  278 
  279         return (0);
  280 }

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