The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    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/10.3/sys/amd64/amd64/elf_machdep.c 294136 2016-01-16 07:56:49Z dchagin $");
   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                         addend = *(Elf32_Addr *)where;
  185                         break;
  186                 default:
  187                         addend = *where;
  188                         break;
  189                 }
  190                 break;
  191         case ELF_RELOC_RELA:
  192                 rela = (const Elf_Rela *)data;
  193                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  194                 addend = rela->r_addend;
  195                 rtype = ELF_R_TYPE(rela->r_info);
  196                 symidx = ELF_R_SYM(rela->r_info);
  197                 break;
  198         default:
  199                 panic("unknown reloc type %d\n", type);
  200         }
  201 
  202         switch (rtype) {
  203 
  204                 case R_X86_64_NONE:     /* none */
  205                         break;
  206 
  207                 case R_X86_64_64:               /* S + A */
  208                         error = lookup(lf, symidx, 1, &addr);
  209                         val = addr + addend;
  210                         if (error != 0)
  211                                 return -1;
  212                         if (*where != val)
  213                                 *where = val;
  214                         break;
  215 
  216                 case R_X86_64_PC32:     /* S + A - P */
  217                         error = lookup(lf, symidx, 1, &addr);
  218                         where32 = (Elf32_Addr *)where;
  219                         val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
  220                         if (error != 0)
  221                                 return -1;
  222                         if (*where32 != val32)
  223                                 *where32 = val32;
  224                         break;
  225 
  226                 case R_X86_64_32S:      /* S + A sign extend */
  227                         error = lookup(lf, symidx, 1, &addr);
  228                         val32 = (Elf32_Addr)(addr + addend);
  229                         where32 = (Elf32_Addr *)where;
  230                         if (error != 0)
  231                                 return -1;
  232                         if (*where32 != val32)
  233                                 *where32 = val32;
  234                         break;
  235 
  236                 case R_X86_64_COPY:     /* none */
  237                         /*
  238                          * There shouldn't be copy relocations in kernel
  239                          * objects.
  240                          */
  241                         printf("kldload: unexpected R_COPY relocation\n");
  242                         return -1;
  243                         break;
  244 
  245                 case R_X86_64_GLOB_DAT: /* S */
  246                 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
  247                         error = lookup(lf, symidx, 1, &addr);
  248                         if (error != 0)
  249                                 return -1;
  250                         if (*where != addr)
  251                                 *where = addr;
  252                         break;
  253 
  254                 case R_X86_64_RELATIVE: /* B + A */
  255                         addr = relocbase + addend;
  256                         val = addr;
  257                         if (*where != val)
  258                                 *where = val;
  259                         break;
  260 
  261                 default:
  262                         printf("kldload: unexpected relocation type %ld\n",
  263                                rtype);
  264                         return -1;
  265         }
  266         return(0);
  267 }
  268 
  269 int
  270 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  271     elf_lookup_fn lookup)
  272 {
  273 
  274         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  275 }
  276 
  277 int
  278 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  279     int type, elf_lookup_fn lookup)
  280 {
  281 
  282         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  283 }
  284 
  285 int
  286 elf_cpu_load_file(linker_file_t lf __unused)
  287 {
  288 
  289         return (0);
  290 }
  291 
  292 int
  293 elf_cpu_unload_file(linker_file_t lf __unused)
  294 {
  295 
  296         return (0);
  297 }

Cache object: 085b576b4b1b8f67755f6441fedb665c


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.