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

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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: releng/9.0/sys/i386/i386/elf_machdep.c 219405 2011-03-08 19:01:45Z 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/md_var.h>
   48 
   49 struct sysentvec elf32_freebsd_sysvec = {
   50         .sv_size        = SYS_MAXSYSCALL,
   51         .sv_table       = sysent,
   52         .sv_mask        = 0,
   53         .sv_sigsize     = 0,
   54         .sv_sigtbl      = NULL,
   55         .sv_errsize     = 0,
   56         .sv_errtbl      = NULL,
   57         .sv_transtrap   = NULL,
   58         .sv_fixup       = __elfN(freebsd_fixup),
   59         .sv_sendsig     = sendsig,
   60         .sv_sigcode     = sigcode,
   61         .sv_szsigcode   = &szsigcode,
   62         .sv_prepsyscall = NULL,
   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,
   78         .sv_set_syscall_retval = cpu_set_syscall_retval,
   79         .sv_fetch_syscall_args = cpu_fetch_syscall_args,
   80         .sv_syscallnames = syscallnames,
   81         .sv_schedtail   = NULL,
   82 };
   83 
   84 static Elf32_Brandinfo freebsd_brand_info = {
   85         .brand          = ELFOSABI_FREEBSD,
   86         .machine        = EM_386,
   87         .compat_3_brand = "FreeBSD",
   88         .emul_path      = NULL,
   89         .interp_path    = "/libexec/ld-elf.so.1",
   90         .sysvec         = &elf32_freebsd_sysvec,
   91         .interp_newpath = NULL,
   92         .brand_note     = &elf32_freebsd_brandnote,
   93         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
   94 };
   95 
   96 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
   97         (sysinit_cfunc_t) elf32_insert_brand_entry,
   98         &freebsd_brand_info);
   99 
  100 static Elf32_Brandinfo freebsd_brand_oinfo = {
  101         .brand          = ELFOSABI_FREEBSD,
  102         .machine        = EM_386,
  103         .compat_3_brand = "FreeBSD",
  104         .emul_path      = NULL,
  105         .interp_path    = "/usr/libexec/ld-elf.so.1",
  106         .sysvec         = &elf32_freebsd_sysvec,
  107         .interp_newpath = NULL,
  108         .brand_note     = &elf32_freebsd_brandnote,
  109         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  110 };
  111 
  112 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
  113         (sysinit_cfunc_t) elf32_insert_brand_entry,
  114         &freebsd_brand_oinfo);
  115 
  116 static Elf32_Brandinfo kfreebsd_brand_info = {
  117         .brand          = ELFOSABI_FREEBSD,
  118         .machine        = EM_386,
  119         .compat_3_brand = "FreeBSD",
  120         .emul_path      = NULL,
  121         .interp_path    = "/lib/ld.so.1",
  122         .sysvec         = &elf32_freebsd_sysvec,
  123         .interp_newpath = NULL,
  124         .brand_note     = &elf32_kfreebsd_brandnote,
  125         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
  126 };
  127 
  128 SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY,
  129         (sysinit_cfunc_t) elf32_insert_brand_entry,
  130         &kfreebsd_brand_info);
  131 
  132 
  133 void
  134 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
  135     size_t *off __unused)
  136 {
  137 }
  138 
  139 
  140 /* Process one elf relocation with addend. */
  141 static int
  142 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  143     int type, int local, elf_lookup_fn lookup)
  144 {
  145         Elf_Addr *where;
  146         Elf_Addr addr;
  147         Elf_Addr addend;
  148         Elf_Word rtype, symidx;
  149         const Elf_Rel *rel;
  150         const Elf_Rela *rela;
  151 
  152         switch (type) {
  153         case ELF_RELOC_REL:
  154                 rel = (const Elf_Rel *)data;
  155                 where = (Elf_Addr *) (relocbase + rel->r_offset);
  156                 addend = *where;
  157                 rtype = ELF_R_TYPE(rel->r_info);
  158                 symidx = ELF_R_SYM(rel->r_info);
  159                 break;
  160         case ELF_RELOC_RELA:
  161                 rela = (const Elf_Rela *)data;
  162                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  163                 addend = rela->r_addend;
  164                 rtype = ELF_R_TYPE(rela->r_info);
  165                 symidx = ELF_R_SYM(rela->r_info);
  166                 break;
  167         default:
  168                 panic("unknown reloc type %d\n", type);
  169         }
  170 
  171         if (local) {
  172                 if (rtype == R_386_RELATIVE) {  /* A + B */
  173                         addr = elf_relocaddr(lf, relocbase + addend);
  174                         if (*where != addr)
  175                                 *where = addr;
  176                 }
  177                 return (0);
  178         }
  179 
  180         switch (rtype) {
  181 
  182                 case R_386_NONE:        /* none */
  183                         break;
  184 
  185                 case R_386_32:          /* S + A */
  186                         addr = lookup(lf, symidx, 1);
  187                         if (addr == 0)
  188                                 return -1;
  189                         addr += addend;
  190                         if (*where != addr)
  191                                 *where = addr;
  192                         break;
  193 
  194                 case R_386_PC32:        /* S + A - P */
  195                         addr = lookup(lf, symidx, 1);
  196                         if (addr == 0)
  197                                 return -1;
  198                         addr += addend - (Elf_Addr)where;
  199                         if (*where != addr)
  200                                 *where = addr;
  201                         break;
  202 
  203                 case R_386_COPY:        /* none */
  204                         /*
  205                          * There shouldn't be copy relocations in kernel
  206                          * objects.
  207                          */
  208                         printf("kldload: unexpected R_COPY relocation\n");
  209                         return -1;
  210                         break;
  211 
  212                 case R_386_GLOB_DAT:    /* S */
  213                         addr = lookup(lf, symidx, 1);
  214                         if (addr == 0)
  215                                 return -1;
  216                         if (*where != addr)
  217                                 *where = addr;
  218                         break;
  219 
  220                 case R_386_RELATIVE:
  221                         break;
  222 
  223                 default:
  224                         printf("kldload: unexpected relocation type %d\n",
  225                                rtype);
  226                         return -1;
  227         }
  228         return(0);
  229 }
  230 
  231 int
  232 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  233     elf_lookup_fn lookup)
  234 {
  235 
  236         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  237 }
  238 
  239 int
  240 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  241     int type, elf_lookup_fn lookup)
  242 {
  243 
  244         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  245 }
  246 
  247 int
  248 elf_cpu_load_file(linker_file_t lf __unused)
  249 {
  250 
  251         return (0);
  252 }
  253 
  254 int
  255 elf_cpu_unload_file(linker_file_t lf __unused)
  256 {
  257 
  258         return (0);
  259 }

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