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/11/sys/amd64/amd64/elf_machdep.c 338867 2018-09-21 20:40:37Z markj $");
   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_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_name        = "FreeBSD ELF64",
   62         .sv_coredump    = __elfN(coredump),
   63         .sv_imgact_try  = NULL,
   64         .sv_minsigstksz = MINSIGSTKSZ,
   65         .sv_pagesize    = PAGE_SIZE,
   66         .sv_minuser     = VM_MIN_ADDRESS,
   67         .sv_maxuser     = VM_MAXUSER_ADDRESS,
   68         .sv_usrstack    = USRSTACK,
   69         .sv_psstrings   = PS_STRINGS,
   70         .sv_stackprot   = VM_PROT_ALL,
   71         .sv_copyout_strings     = exec_copyout_strings,
   72         .sv_setregs     = exec_setregs,
   73         .sv_fixlimit    = NULL,
   74         .sv_maxssiz     = NULL,
   75         .sv_flags       = SV_ABI_FREEBSD | SV_LP64 | SV_SHP | SV_TIMEKEEP,
   76         .sv_set_syscall_retval = cpu_set_syscall_retval,
   77         .sv_fetch_syscall_args = cpu_fetch_syscall_args,
   78         .sv_syscallnames = syscallnames,
   79         .sv_shared_page_base = SHAREDPAGE,
   80         .sv_shared_page_len = PAGE_SIZE,
   81         .sv_schedtail   = NULL,
   82         .sv_thread_detach = NULL,
   83         .sv_trap        = NULL,
   84 };
   85 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec);
   86 
   87 void
   88 amd64_lower_shared_page(struct sysentvec *sv)
   89 {
   90         if (hw_lower_amd64_sharedpage != 0) {
   91                 sv->sv_maxuser -= PAGE_SIZE;
   92                 sv->sv_shared_page_base -= PAGE_SIZE;
   93                 sv->sv_usrstack -= PAGE_SIZE;
   94                 sv->sv_psstrings -= PAGE_SIZE;
   95         }
   96 }
   97 
   98 /*
   99  * Do this fixup before INIT_SYSENTVEC (SI_ORDER_ANY) because the latter
  100  * uses the value of sv_shared_page_base.
  101  */
  102 SYSINIT(elf64_sysvec_fixup, SI_SUB_EXEC, SI_ORDER_FIRST,
  103         (sysinit_cfunc_t) amd64_lower_shared_page,
  104         &elf64_freebsd_sysvec);
  105 
  106 static Elf64_Brandinfo freebsd_brand_info = {
  107         .brand          = ELFOSABI_FREEBSD,
  108         .machine        = EM_X86_64,
  109         .compat_3_brand = "FreeBSD",
  110         .emul_path      = NULL,
  111         .interp_path    = "/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(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
  119         (sysinit_cfunc_t) elf64_insert_brand_entry,
  120         &freebsd_brand_info);
  121 
  122 static Elf64_Brandinfo freebsd_brand_oinfo = {
  123         .brand          = ELFOSABI_FREEBSD,
  124         .machine        = EM_X86_64,
  125         .compat_3_brand = "FreeBSD",
  126         .emul_path      = NULL,
  127         .interp_path    = "/usr/libexec/ld-elf.so.1",
  128         .sysvec         = &elf64_freebsd_sysvec,
  129         .interp_newpath = NULL,
  130         .brand_note     = &elf64_freebsd_brandnote,
  131         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  132 };
  133 
  134 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
  135         (sysinit_cfunc_t) elf64_insert_brand_entry,
  136         &freebsd_brand_oinfo);
  137 
  138 static Elf64_Brandinfo kfreebsd_brand_info = {
  139         .brand          = ELFOSABI_FREEBSD,
  140         .machine        = EM_X86_64,
  141         .compat_3_brand = "FreeBSD",
  142         .emul_path      = NULL,
  143         .interp_path    = "/lib/ld-kfreebsd-x86-64.so.1",
  144         .sysvec         = &elf64_freebsd_sysvec,
  145         .interp_newpath = NULL,
  146         .brand_note     = &elf64_kfreebsd_brandnote,
  147         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
  148 };
  149 
  150 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY,
  151         (sysinit_cfunc_t) elf64_insert_brand_entry,
  152         &kfreebsd_brand_info);
  153 
  154 void
  155 elf64_dump_thread(struct thread *td, void *dst, size_t *off)
  156 {
  157         void *buf;
  158         size_t len;
  159 
  160         len = 0;
  161         if (use_xsave) {
  162                 if (dst != NULL) {
  163                         fpugetregs(td);
  164                         len += elf64_populate_note(NT_X86_XSTATE,
  165                             get_pcb_user_save_td(td), dst,
  166                             cpu_max_ext_state_size, &buf);
  167                         *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
  168                             xsave_mask;
  169                 } else
  170                         len += elf64_populate_note(NT_X86_XSTATE, NULL, NULL,
  171                             cpu_max_ext_state_size, NULL);
  172         }
  173         *off = len;
  174 }
  175 
  176 bool
  177 elf_is_ifunc_reloc(Elf_Size r_info)
  178 {
  179 
  180         return (ELF_R_TYPE(r_info) == R_X86_64_IRELATIVE);
  181 }
  182 
  183 /* Process one elf relocation with addend. */
  184 static int
  185 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  186     int type, elf_lookup_fn lookup)
  187 {
  188         Elf64_Addr *where, val;
  189         Elf32_Addr *where32, val32;
  190         Elf_Addr addr;
  191         Elf_Addr addend;
  192         Elf_Size rtype, symidx;
  193         const Elf_Rel *rel;
  194         const Elf_Rela *rela;
  195         int error;
  196 
  197         switch (type) {
  198         case ELF_RELOC_REL:
  199                 rel = (const Elf_Rel *)data;
  200                 where = (Elf_Addr *) (relocbase + rel->r_offset);
  201                 rtype = ELF_R_TYPE(rel->r_info);
  202                 symidx = ELF_R_SYM(rel->r_info);
  203                 /* Addend is 32 bit on 32 bit relocs */
  204                 switch (rtype) {
  205                 case R_X86_64_PC32:
  206                 case R_X86_64_32S:
  207                 case R_X86_64_PLT32:
  208                         addend = *(Elf32_Addr *)where;
  209                         break;
  210                 default:
  211                         addend = *where;
  212                         break;
  213                 }
  214                 break;
  215         case ELF_RELOC_RELA:
  216                 rela = (const Elf_Rela *)data;
  217                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  218                 addend = rela->r_addend;
  219                 rtype = ELF_R_TYPE(rela->r_info);
  220                 symidx = ELF_R_SYM(rela->r_info);
  221                 break;
  222         default:
  223                 panic("unknown reloc type %d\n", type);
  224         }
  225 
  226         switch (rtype) {
  227                 case R_X86_64_NONE:     /* none */
  228                         break;
  229 
  230                 case R_X86_64_64:               /* S + A */
  231                         error = lookup(lf, symidx, 1, &addr);
  232                         val = addr + addend;
  233                         if (error != 0)
  234                                 return -1;
  235                         if (*where != val)
  236                                 *where = val;
  237                         break;
  238 
  239                 case R_X86_64_PC32:     /* S + A - P */
  240                 case R_X86_64_PLT32:    /* L + A - P, L is PLT location for
  241                                            the symbol, which we treat as S */
  242                         error = lookup(lf, symidx, 1, &addr);
  243                         where32 = (Elf32_Addr *)where;
  244                         val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
  245                         if (error != 0)
  246                                 return -1;
  247                         if (*where32 != val32)
  248                                 *where32 = val32;
  249                         break;
  250 
  251                 case R_X86_64_32S:      /* S + A sign extend */
  252                         error = lookup(lf, symidx, 1, &addr);
  253                         val32 = (Elf32_Addr)(addr + addend);
  254                         where32 = (Elf32_Addr *)where;
  255                         if (error != 0)
  256                                 return -1;
  257                         if (*where32 != val32)
  258                                 *where32 = val32;
  259                         break;
  260 
  261                 case R_X86_64_COPY:     /* none */
  262                         /*
  263                          * There shouldn't be copy relocations in kernel
  264                          * objects.
  265                          */
  266                         printf("kldload: unexpected R_COPY relocation\n");
  267                         return (-1);
  268                         break;
  269 
  270                 case R_X86_64_GLOB_DAT: /* S */
  271                 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
  272                         error = lookup(lf, symidx, 1, &addr);
  273                         if (error != 0)
  274                                 return -1;
  275                         if (*where != addr)
  276                                 *where = addr;
  277                         break;
  278 
  279                 case R_X86_64_RELATIVE: /* B + A */
  280                         addr = relocbase + addend;
  281                         val = addr;
  282                         if (*where != val)
  283                                 *where = val;
  284                         break;
  285 
  286                 case R_X86_64_IRELATIVE:
  287                         addr = relocbase + addend;
  288                         val = ((Elf64_Addr (*)(void))addr)();
  289                         if (*where != val)
  290                                 *where = val;
  291                         break;
  292 
  293                 default:
  294                         printf("kldload: unexpected relocation type %ld\n",
  295                                rtype);
  296                         return (-1);
  297         }
  298         return (0);
  299 }
  300 
  301 int
  302 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  303     elf_lookup_fn lookup)
  304 {
  305 
  306         return (elf_reloc_internal(lf, relocbase, data, type, lookup));
  307 }
  308 
  309 int
  310 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  311     int type, elf_lookup_fn lookup)
  312 {
  313 
  314         return (elf_reloc_internal(lf, relocbase, data, type, lookup));
  315 }
  316 
  317 int
  318 elf_cpu_load_file(linker_file_t lf __unused)
  319 {
  320 
  321         return (0);
  322 }
  323 
  324 int
  325 elf_cpu_unload_file(linker_file_t lf __unused)
  326 {
  327 
  328         return (0);
  329 }

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