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/i386/i386/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/11.2/sys/i386/i386/elf_machdep.c 333720 2018-05-17 15:24:53Z kib $");
   28 
   29 #include "opt_cpu.h"
   30 
   31 #include <sys/param.h>
   32 #include <sys/kernel.h>
   33 #include <sys/systm.h>
   34 #include <sys/exec.h>
   35 #include <sys/imgact.h>
   36 #include <sys/linker.h>
   37 #include <sys/proc.h>
   38 #include <sys/sysent.h>
   39 #include <sys/imgact_elf.h>
   40 #include <sys/syscall.h>
   41 #include <sys/signalvar.h>
   42 #include <sys/vnode.h>
   43 
   44 #include <vm/vm.h>
   45 #include <vm/pmap.h>
   46 #include <vm/vm_param.h>
   47 
   48 #include <machine/elf.h>
   49 #include <machine/md_var.h>
   50 #include <machine/npx.h>
   51 
   52 struct sysentvec elf32_freebsd_sysvec = {
   53         .sv_size        = SYS_MAXSYSCALL,
   54         .sv_table       = sysent,
   55         .sv_mask        = 0,
   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_name        = "FreeBSD ELF32",
   64         .sv_coredump    = __elfN(coredump),
   65         .sv_imgact_try  = NULL,
   66         .sv_minsigstksz = MINSIGSTKSZ,
   67         .sv_pagesize    = PAGE_SIZE,
   68         .sv_minuser     = VM_MIN_ADDRESS,
   69         .sv_maxuser     = VM_MAXUSER_ADDRESS,
   70         .sv_usrstack    = USRSTACK,
   71         .sv_psstrings   = PS_STRINGS,
   72         .sv_stackprot   = VM_PROT_ALL,
   73         .sv_copyout_strings     = exec_copyout_strings,
   74         .sv_setregs     = exec_setregs,
   75         .sv_fixlimit    = NULL,
   76         .sv_maxssiz     = NULL,
   77         .sv_flags       = SV_ABI_FREEBSD | SV_IA32 | SV_ILP32 | SV_SHP |
   78                             SV_TIMEKEEP,
   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(elf32_sysvec, &elf32_freebsd_sysvec);
   89 
   90 static Elf32_Brandinfo freebsd_brand_info = {
   91         .brand          = ELFOSABI_FREEBSD,
   92         .machine        = EM_386,
   93         .compat_3_brand = "FreeBSD",
   94         .emul_path      = NULL,
   95         .interp_path    = "/libexec/ld-elf.so.1",
   96         .sysvec         = &elf32_freebsd_sysvec,
   97         .interp_newpath = NULL,
   98         .brand_note     = &elf32_freebsd_brandnote,
   99         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  100 };
  101 
  102 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
  103         (sysinit_cfunc_t) elf32_insert_brand_entry,
  104         &freebsd_brand_info);
  105 
  106 static Elf32_Brandinfo freebsd_brand_oinfo = {
  107         .brand          = ELFOSABI_FREEBSD,
  108         .machine        = EM_386,
  109         .compat_3_brand = "FreeBSD",
  110         .emul_path      = NULL,
  111         .interp_path    = "/usr/libexec/ld-elf.so.1",
  112         .sysvec         = &elf32_freebsd_sysvec,
  113         .interp_newpath = NULL,
  114         .brand_note     = &elf32_freebsd_brandnote,
  115         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  116 };
  117 
  118 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
  119         (sysinit_cfunc_t) elf32_insert_brand_entry,
  120         &freebsd_brand_oinfo);
  121 
  122 static Elf32_Brandinfo kfreebsd_brand_info = {
  123         .brand          = ELFOSABI_FREEBSD,
  124         .machine        = EM_386,
  125         .compat_3_brand = "FreeBSD",
  126         .emul_path      = NULL,
  127         .interp_path    = "/lib/ld.so.1",
  128         .sysvec         = &elf32_freebsd_sysvec,
  129         .interp_newpath = NULL,
  130         .brand_note     = &elf32_kfreebsd_brandnote,
  131         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
  132 };
  133 
  134 SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY,
  135         (sysinit_cfunc_t) elf32_insert_brand_entry,
  136         &kfreebsd_brand_info);
  137 
  138 
  139 void
  140 elf32_dump_thread(struct thread *td, void *dst, size_t *off)
  141 {
  142         void *buf;
  143         size_t len;
  144 
  145         len = 0;
  146         if (use_xsave) {
  147                 if (dst != NULL) {
  148                         npxgetregs(td);
  149                         len += elf32_populate_note(NT_X86_XSTATE,
  150                             get_pcb_user_save_td(td), dst,
  151                             cpu_max_ext_state_size, &buf);
  152                         *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
  153                             xsave_mask;
  154                 } else
  155                         len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL,
  156                             cpu_max_ext_state_size, NULL);
  157         }
  158         *off = len;
  159 }
  160 
  161 #define ERI_LOCAL       0x0001
  162 #define ERI_ONLYIFUNC   0x0002
  163 
  164 /* Process one elf relocation with addend. */
  165 static int
  166 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  167     int type, elf_lookup_fn lookup, int flags)
  168 {
  169         Elf_Addr *where;
  170         Elf_Addr addr;
  171         Elf_Addr addend;
  172         Elf_Word rtype, symidx;
  173         const Elf_Rel *rel;
  174         const Elf_Rela *rela;
  175         int error;
  176 
  177         switch (type) {
  178         case ELF_RELOC_REL:
  179                 rel = (const Elf_Rel *)data;
  180                 where = (Elf_Addr *) (relocbase + rel->r_offset);
  181                 addend = *where;
  182                 rtype = ELF_R_TYPE(rel->r_info);
  183                 symidx = ELF_R_SYM(rel->r_info);
  184                 break;
  185         case ELF_RELOC_RELA:
  186                 rela = (const Elf_Rela *)data;
  187                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  188                 addend = rela->r_addend;
  189                 rtype = ELF_R_TYPE(rela->r_info);
  190                 symidx = ELF_R_SYM(rela->r_info);
  191                 break;
  192         default:
  193                 panic("unknown reloc type %d\n", type);
  194         }
  195 
  196         if (((flags & ERI_ONLYIFUNC) == 0) ^ (rtype != R_386_IRELATIVE))
  197                 return (0);
  198 
  199         if ((flags & ERI_LOCAL) != 0) {
  200                 if (rtype == R_386_RELATIVE) {  /* A + B */
  201                         addr = elf_relocaddr(lf, relocbase + addend);
  202                         if (*where != addr)
  203                                 *where = addr;
  204                 }
  205                 return (0);
  206         }
  207 
  208         switch (rtype) {
  209 
  210                 case R_386_NONE:        /* none */
  211                         break;
  212 
  213                 case R_386_32:          /* S + A */
  214                         error = lookup(lf, symidx, 1, &addr);
  215                         if (error != 0)
  216                                 return -1;
  217                         addr += addend;
  218                         if (*where != addr)
  219                                 *where = addr;
  220                         break;
  221 
  222                 case R_386_PC32:        /* S + A - P */
  223                         error = lookup(lf, symidx, 1, &addr);
  224                         if (error != 0)
  225                                 return -1;
  226                         addr += addend - (Elf_Addr)where;
  227                         if (*where != addr)
  228                                 *where = addr;
  229                         break;
  230 
  231                 case R_386_COPY:        /* none */
  232                         /*
  233                          * There shouldn't be copy relocations in kernel
  234                          * objects.
  235                          */
  236                         printf("kldload: unexpected R_COPY relocation\n");
  237                         return -1;
  238                         break;
  239 
  240                 case R_386_GLOB_DAT:    /* S */
  241                         error = lookup(lf, symidx, 1, &addr);
  242                         if (error != 0)
  243                                 return -1;
  244                         if (*where != addr)
  245                                 *where = addr;
  246                         break;
  247 
  248                 case R_386_RELATIVE:
  249                         break;
  250 
  251                 case R_386_IRELATIVE:
  252                         addr = relocbase + addend;
  253                         addr = ((Elf_Addr (*)(void))addr)();
  254                         if (*where != addr)
  255                                 *where = addr;
  256                         break;
  257                 default:
  258                         printf("kldload: unexpected relocation type %d\n",
  259                                rtype);
  260                         return -1;
  261         }
  262         return(0);
  263 }
  264 
  265 int
  266 elf_reloc_ifunc(linker_file_t lf, Elf_Addr relocbase, const void *data,
  267     int type, elf_lookup_fn lookup)
  268 {
  269 
  270         return (elf_reloc_internal(lf, relocbase, data, type, lookup,
  271             ERI_ONLYIFUNC));
  272 }
  273 
  274 int
  275 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  276     elf_lookup_fn lookup)
  277 {
  278 
  279         return (elf_reloc_internal(lf, relocbase, data, type, lookup, 0));
  280 }
  281 
  282 int
  283 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  284     int type, elf_lookup_fn lookup)
  285 {
  286 
  287         return (elf_reloc_internal(lf, relocbase, data, type, lookup,
  288             ERI_LOCAL));
  289 }
  290 
  291 int
  292 elf_cpu_load_file(linker_file_t lf __unused)
  293 {
  294 
  295         return (0);
  296 }
  297 
  298 int
  299 elf_cpu_unload_file(linker_file_t lf __unused)
  300 {
  301 
  302         return (0);
  303 }

Cache object: 112b876af15f7b4a0c8298a7aed5a283


[ 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.