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/i386/i386/elf_machdep.c

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
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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("$FreeBSD$");
   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 bool
  162 elf_is_ifunc_reloc(Elf_Size r_info)
  163 {
  164 
  165         return (ELF_R_TYPE(r_info) == R_386_IRELATIVE);
  166 }
  167 
  168 #define ERI_LOCAL       0x0001
  169 
  170 /* Process one elf relocation with addend. */
  171 static int
  172 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  173     int type, elf_lookup_fn lookup, int flags)
  174 {
  175         Elf_Addr *where;
  176         Elf_Addr addr;
  177         Elf_Addr addend;
  178         Elf_Word rtype, symidx;
  179         const Elf_Rel *rel;
  180         const Elf_Rela *rela;
  181         int error;
  182 
  183         switch (type) {
  184         case ELF_RELOC_REL:
  185                 rel = (const Elf_Rel *)data;
  186                 where = (Elf_Addr *) (relocbase + rel->r_offset);
  187                 addend = *where;
  188                 rtype = ELF_R_TYPE(rel->r_info);
  189                 symidx = ELF_R_SYM(rel->r_info);
  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         if ((flags & ERI_LOCAL) != 0) {
  203                 if (rtype == R_386_RELATIVE) {  /* A + B */
  204                         addr = elf_relocaddr(lf, relocbase + addend);
  205                         if (*where != addr)
  206                                 *where = addr;
  207                 }
  208                 return (0);
  209         }
  210 
  211         switch (rtype) {
  212 
  213                 case R_386_NONE:        /* none */
  214                         break;
  215 
  216                 case R_386_32:          /* S + A */
  217                         error = lookup(lf, symidx, 1, &addr);
  218                         if (error != 0)
  219                                 return -1;
  220                         addr += addend;
  221                         if (*where != addr)
  222                                 *where = addr;
  223                         break;
  224 
  225                 case R_386_PC32:        /* S + A - P */
  226                         error = lookup(lf, symidx, 1, &addr);
  227                         if (error != 0)
  228                                 return -1;
  229                         addr += addend - (Elf_Addr)where;
  230                         if (*where != addr)
  231                                 *where = addr;
  232                         break;
  233 
  234                 case R_386_COPY:        /* none */
  235                         /*
  236                          * There shouldn't be copy relocations in kernel
  237                          * objects.
  238                          */
  239                         printf("kldload: unexpected R_COPY relocation\n");
  240                         return -1;
  241                         break;
  242 
  243                 case R_386_GLOB_DAT:    /* S */
  244                         error = lookup(lf, symidx, 1, &addr);
  245                         if (error != 0)
  246                                 return -1;
  247                         if (*where != addr)
  248                                 *where = addr;
  249                         break;
  250 
  251                 case R_386_RELATIVE:
  252                         break;
  253 
  254                 case R_386_IRELATIVE:
  255                         addr = relocbase + addend;
  256                         addr = ((Elf_Addr (*)(void))addr)();
  257                         if (*where != addr)
  258                                 *where = addr;
  259                         break;
  260                 default:
  261                         printf("kldload: unexpected relocation type %d\n",
  262                                rtype);
  263                         return -1;
  264         }
  265         return(0);
  266 }
  267 
  268 int
  269 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  270     elf_lookup_fn lookup)
  271 {
  272 
  273         return (elf_reloc_internal(lf, relocbase, data, type, lookup, 0));
  274 }
  275 
  276 int
  277 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  278     int type, elf_lookup_fn lookup)
  279 {
  280 
  281         return (elf_reloc_internal(lf, relocbase, data, type, lookup,
  282             ERI_LOCAL));
  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 }

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