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/9/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 | SV_SHP,
   79         .sv_set_syscall_retval = cpu_set_syscall_retval,
   80         .sv_fetch_syscall_args = cpu_fetch_syscall_args,
   81         .sv_syscallnames = syscallnames,
   82         .sv_shared_page_base = SHAREDPAGE,
   83         .sv_shared_page_len = PAGE_SIZE,
   84         .sv_schedtail   = NULL,
   85 };
   86 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec);
   87 
   88 static Elf64_Brandinfo freebsd_brand_info = {
   89         .brand          = ELFOSABI_FREEBSD,
   90         .machine        = EM_X86_64,
   91         .compat_3_brand = "FreeBSD",
   92         .emul_path      = NULL,
   93         .interp_path    = "/libexec/ld-elf.so.1",
   94         .sysvec         = &elf64_freebsd_sysvec,
   95         .interp_newpath = NULL,
   96         .brand_note     = &elf64_freebsd_brandnote,
   97         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
   98 };
   99 
  100 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
  101         (sysinit_cfunc_t) elf64_insert_brand_entry,
  102         &freebsd_brand_info);
  103 
  104 static Elf64_Brandinfo freebsd_brand_oinfo = {
  105         .brand          = ELFOSABI_FREEBSD,
  106         .machine        = EM_X86_64,
  107         .compat_3_brand = "FreeBSD",
  108         .emul_path      = NULL,
  109         .interp_path    = "/usr/libexec/ld-elf.so.1",
  110         .sysvec         = &elf64_freebsd_sysvec,
  111         .interp_newpath = NULL,
  112         .brand_note     = &elf64_freebsd_brandnote,
  113         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  114 };
  115 
  116 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
  117         (sysinit_cfunc_t) elf64_insert_brand_entry,
  118         &freebsd_brand_oinfo);
  119 
  120 static Elf64_Brandinfo kfreebsd_brand_info = {
  121         .brand          = ELFOSABI_FREEBSD,
  122         .machine        = EM_X86_64,
  123         .compat_3_brand = "FreeBSD",
  124         .emul_path      = NULL,
  125         .interp_path    = "/lib/ld-kfreebsd-x86-64.so.1",
  126         .sysvec         = &elf64_freebsd_sysvec,
  127         .interp_newpath = NULL,
  128         .brand_note     = &elf64_kfreebsd_brandnote,
  129         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
  130 };
  131 
  132 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY,
  133         (sysinit_cfunc_t) elf64_insert_brand_entry,
  134         &kfreebsd_brand_info);
  135 
  136 void
  137 elf64_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         Elf64_Addr *where, val;
  149         Elf32_Addr *where32, val32;
  150         Elf_Addr addr;
  151         Elf_Addr addend;
  152         Elf_Size rtype, symidx;
  153         const Elf_Rel *rel;
  154         const Elf_Rela *rela;
  155 
  156         switch (type) {
  157         case ELF_RELOC_REL:
  158                 rel = (const Elf_Rel *)data;
  159                 where = (Elf_Addr *) (relocbase + rel->r_offset);
  160                 rtype = ELF_R_TYPE(rel->r_info);
  161                 symidx = ELF_R_SYM(rel->r_info);
  162                 /* Addend is 32 bit on 32 bit relocs */
  163                 switch (rtype) {
  164                 case R_X86_64_PC32:
  165                 case R_X86_64_32S:
  166                 case R_X86_64_PLT32:
  167                         addend = *(Elf32_Addr *)where;
  168                         break;
  169                 default:
  170                         addend = *where;
  171                         break;
  172                 }
  173                 break;
  174         case ELF_RELOC_RELA:
  175                 rela = (const Elf_Rela *)data;
  176                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  177                 addend = rela->r_addend;
  178                 rtype = ELF_R_TYPE(rela->r_info);
  179                 symidx = ELF_R_SYM(rela->r_info);
  180                 break;
  181         default:
  182                 panic("unknown reloc type %d\n", type);
  183         }
  184 
  185         switch (rtype) {
  186 
  187                 case R_X86_64_NONE:     /* none */
  188                         break;
  189 
  190                 case R_X86_64_64:               /* S + A */
  191                         addr = lookup(lf, symidx, 1);
  192                         val = addr + addend;
  193                         if (addr == 0)
  194                                 return -1;
  195                         if (*where != val)
  196                                 *where = val;
  197                         break;
  198 
  199                 case R_X86_64_PC32:     /* S + A - P */
  200                 case R_X86_64_PLT32:    /* L + A - P, L is PLT location for
  201                                            the symbol, which we treat as S */
  202                         addr = lookup(lf, symidx, 1);
  203                         where32 = (Elf32_Addr *)where;
  204                         val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
  205                         if (addr == 0)
  206                                 return -1;
  207                         if (*where32 != val32)
  208                                 *where32 = val32;
  209                         break;
  210 
  211                 case R_X86_64_32S:      /* S + A sign extend */
  212                         addr = lookup(lf, symidx, 1);
  213                         val32 = (Elf32_Addr)(addr + addend);
  214                         where32 = (Elf32_Addr *)where;
  215                         if (addr == 0)
  216                                 return -1;
  217                         if (*where32 != val32)
  218                                 *where32 = val32;
  219                         break;
  220 
  221                 case R_X86_64_COPY:     /* none */
  222                         /*
  223                          * There shouldn't be copy relocations in kernel
  224                          * objects.
  225                          */
  226                         printf("kldload: unexpected R_COPY relocation\n");
  227                         return -1;
  228                         break;
  229 
  230                 case R_X86_64_GLOB_DAT: /* S */
  231                 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
  232                         addr = lookup(lf, symidx, 1);
  233                         if (addr == 0)
  234                                 return -1;
  235                         if (*where != addr)
  236                                 *where = addr;
  237                         break;
  238 
  239                 case R_X86_64_RELATIVE: /* B + A */
  240                         addr = relocbase + addend;
  241                         val = addr;
  242                         if (*where != val)
  243                                 *where = val;
  244                         break;
  245 
  246                 default:
  247                         printf("kldload: unexpected relocation type %ld\n",
  248                                rtype);
  249                         return -1;
  250         }
  251         return(0);
  252 }
  253 
  254 int
  255 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  256     elf_lookup_fn lookup)
  257 {
  258 
  259         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  260 }
  261 
  262 int
  263 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  264     int type, elf_lookup_fn lookup)
  265 {
  266 
  267         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  268 }
  269 
  270 int
  271 elf_cpu_load_file(linker_file_t lf __unused)
  272 {
  273 
  274         return (0);
  275 }
  276 
  277 int
  278 elf_cpu_unload_file(linker_file_t lf __unused)
  279 {
  280 
  281         return (0);
  282 }

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