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/10/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/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/fpu.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         .sv_thread_detach = NULL,
   86         .sv_trap        = NULL,
   87 };
   88 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec);
   89 
   90 static Elf64_Brandinfo freebsd_brand_info = {
   91         .brand          = ELFOSABI_FREEBSD,
   92         .machine        = EM_X86_64,
   93         .compat_3_brand = "FreeBSD",
   94         .emul_path      = NULL,
   95         .interp_path    = "/libexec/ld-elf.so.1",
   96         .sysvec         = &elf64_freebsd_sysvec,
   97         .interp_newpath = NULL,
   98         .brand_note     = &elf64_freebsd_brandnote,
   99         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  100 };
  101 
  102 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
  103         (sysinit_cfunc_t) elf64_insert_brand_entry,
  104         &freebsd_brand_info);
  105 
  106 static Elf64_Brandinfo freebsd_brand_oinfo = {
  107         .brand          = ELFOSABI_FREEBSD,
  108         .machine        = EM_X86_64,
  109         .compat_3_brand = "FreeBSD",
  110         .emul_path      = NULL,
  111         .interp_path    = "/usr/libexec/ld-elf.so.1",
  112         .sysvec         = &elf64_freebsd_sysvec,
  113         .interp_newpath = NULL,
  114         .brand_note     = &elf64_freebsd_brandnote,
  115         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  116 };
  117 
  118 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
  119         (sysinit_cfunc_t) elf64_insert_brand_entry,
  120         &freebsd_brand_oinfo);
  121 
  122 static Elf64_Brandinfo kfreebsd_brand_info = {
  123         .brand          = ELFOSABI_FREEBSD,
  124         .machine        = EM_X86_64,
  125         .compat_3_brand = "FreeBSD",
  126         .emul_path      = NULL,
  127         .interp_path    = "/lib/ld-kfreebsd-x86-64.so.1",
  128         .sysvec         = &elf64_freebsd_sysvec,
  129         .interp_newpath = NULL,
  130         .brand_note     = &elf64_kfreebsd_brandnote,
  131         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
  132 };
  133 
  134 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY,
  135         (sysinit_cfunc_t) elf64_insert_brand_entry,
  136         &kfreebsd_brand_info);
  137 
  138 void
  139 elf64_dump_thread(struct thread *td, void *dst, size_t *off)
  140 {
  141         void *buf;
  142         size_t len;
  143 
  144         len = 0;
  145         if (use_xsave) {
  146                 if (dst != NULL) {
  147                         fpugetregs(td);
  148                         len += elf64_populate_note(NT_X86_XSTATE,
  149                             get_pcb_user_save_td(td), dst,
  150                             cpu_max_ext_state_size, &buf);
  151                         *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
  152                             xsave_mask;
  153                 } else
  154                         len += elf64_populate_note(NT_X86_XSTATE, NULL, NULL,
  155                             cpu_max_ext_state_size, NULL);
  156         }
  157         *off = len;
  158 }
  159 
  160 /* Process one elf relocation with addend. */
  161 static int
  162 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  163     int type, int local, elf_lookup_fn lookup)
  164 {
  165         Elf64_Addr *where, val;
  166         Elf32_Addr *where32, val32;
  167         Elf_Addr addr;
  168         Elf_Addr addend;
  169         Elf_Size rtype, symidx;
  170         const Elf_Rel *rel;
  171         const Elf_Rela *rela;
  172         int error;
  173 
  174         switch (type) {
  175         case ELF_RELOC_REL:
  176                 rel = (const Elf_Rel *)data;
  177                 where = (Elf_Addr *) (relocbase + rel->r_offset);
  178                 rtype = ELF_R_TYPE(rel->r_info);
  179                 symidx = ELF_R_SYM(rel->r_info);
  180                 /* Addend is 32 bit on 32 bit relocs */
  181                 switch (rtype) {
  182                 case R_X86_64_PC32:
  183                 case R_X86_64_32S:
  184                 case R_X86_64_PLT32:
  185                         addend = *(Elf32_Addr *)where;
  186                         break;
  187                 default:
  188                         addend = *where;
  189                         break;
  190                 }
  191                 break;
  192         case ELF_RELOC_RELA:
  193                 rela = (const Elf_Rela *)data;
  194                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  195                 addend = rela->r_addend;
  196                 rtype = ELF_R_TYPE(rela->r_info);
  197                 symidx = ELF_R_SYM(rela->r_info);
  198                 break;
  199         default:
  200                 panic("unknown reloc type %d\n", type);
  201         }
  202 
  203         switch (rtype) {
  204 
  205                 case R_X86_64_NONE:     /* none */
  206                         break;
  207 
  208                 case R_X86_64_64:               /* S + A */
  209                         error = lookup(lf, symidx, 1, &addr);
  210                         val = addr + addend;
  211                         if (error != 0)
  212                                 return -1;
  213                         if (*where != val)
  214                                 *where = val;
  215                         break;
  216 
  217                 case R_X86_64_PC32:     /* S + A - P */
  218                 case R_X86_64_PLT32:    /* L + A - P, L is PLT location for
  219                                            the symbol, which we treat as S */
  220                         error = lookup(lf, symidx, 1, &addr);
  221                         where32 = (Elf32_Addr *)where;
  222                         val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
  223                         if (error != 0)
  224                                 return -1;
  225                         if (*where32 != val32)
  226                                 *where32 = val32;
  227                         break;
  228 
  229                 case R_X86_64_32S:      /* S + A sign extend */
  230                         error = lookup(lf, symidx, 1, &addr);
  231                         val32 = (Elf32_Addr)(addr + addend);
  232                         where32 = (Elf32_Addr *)where;
  233                         if (error != 0)
  234                                 return -1;
  235                         if (*where32 != val32)
  236                                 *where32 = val32;
  237                         break;
  238 
  239                 case R_X86_64_COPY:     /* none */
  240                         /*
  241                          * There shouldn't be copy relocations in kernel
  242                          * objects.
  243                          */
  244                         printf("kldload: unexpected R_COPY relocation\n");
  245                         return -1;
  246                         break;
  247 
  248                 case R_X86_64_GLOB_DAT: /* S */
  249                 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
  250                         error = lookup(lf, symidx, 1, &addr);
  251                         if (error != 0)
  252                                 return -1;
  253                         if (*where != addr)
  254                                 *where = addr;
  255                         break;
  256 
  257                 case R_X86_64_RELATIVE: /* B + A */
  258                         addr = relocbase + addend;
  259                         val = addr;
  260                         if (*where != val)
  261                                 *where = val;
  262                         break;
  263 
  264                 default:
  265                         printf("kldload: unexpected relocation type %ld\n",
  266                                rtype);
  267                         return -1;
  268         }
  269         return(0);
  270 }
  271 
  272 int
  273 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  274     elf_lookup_fn lookup)
  275 {
  276 
  277         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  278 }
  279 
  280 int
  281 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  282     int type, elf_lookup_fn lookup)
  283 {
  284 
  285         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  286 }
  287 
  288 int
  289 elf_cpu_load_file(linker_file_t lf __unused)
  290 {
  291 
  292         return (0);
  293 }
  294 
  295 int
  296 elf_cpu_unload_file(linker_file_t lf __unused)
  297 {
  298 
  299         return (0);
  300 }

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