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/arm/arm/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/8.1/sys/arm/arm/elf_machdep.c 200165 2009-12-05 20:43:15Z bz $");
   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/sysent.h>
   36 #include <sys/imgact_elf.h>
   37 #include <sys/syscall.h>
   38 #include <sys/signalvar.h>
   39 #include <sys/vnode.h>
   40 
   41 #include <vm/vm.h>
   42 #include <vm/pmap.h>
   43 #include <vm/vm_param.h>
   44 
   45 #include <machine/elf.h>
   46 #include <machine/md_var.h>
   47 
   48 struct sysentvec elf32_freebsd_sysvec = {
   49         .sv_size        = SYS_MAXSYSCALL,
   50         .sv_table       = sysent,
   51         .sv_mask        = 0,
   52         .sv_sigsize     = 0,
   53         .sv_sigtbl      = NULL,
   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_prepsyscall = NULL,
   62         .sv_name        = "FreeBSD ELF32",
   63         .sv_coredump    = __elfN(coredump),
   64         .sv_imgact_try  = NULL,
   65         .sv_minsigstksz = MINSIGSTKSZ,
   66         .sv_pagesize    = PAGE_SIZE,
   67         .sv_minuser     = VM_MIN_ADDRESS,
   68         .sv_maxuser     = VM_MAXUSER_ADDRESS,
   69         .sv_usrstack    = USRSTACK,
   70         .sv_psstrings   = PS_STRINGS,
   71         .sv_stackprot   = VM_PROT_ALL,
   72         .sv_copyout_strings = exec_copyout_strings,
   73         .sv_setregs     = exec_setregs,
   74         .sv_fixlimit    = NULL,
   75         .sv_maxssiz     = NULL,
   76         .sv_flags       = SV_ABI_FREEBSD | SV_ILP32
   77 };
   78 
   79 static Elf32_Brandinfo freebsd_brand_info = {
   80         .brand          = ELFOSABI_FREEBSD,
   81         .machine        = EM_ARM,
   82         .compat_3_brand = "FreeBSD",
   83         .emul_path      = NULL,
   84         .interp_path    = "/libexec/ld-elf.so.1",
   85         .sysvec         = &elf32_freebsd_sysvec,
   86         .interp_newpath = NULL,
   87         .brand_note     = &elf32_freebsd_brandnote,
   88         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
   89 };
   90 
   91 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
   92         (sysinit_cfunc_t) elf32_insert_brand_entry,
   93         &freebsd_brand_info);
   94 
   95 static Elf32_Brandinfo freebsd_brand_oinfo = {
   96         .brand          = ELFOSABI_FREEBSD,
   97         .machine        = EM_ARM,
   98         .compat_3_brand = "FreeBSD",
   99         .emul_path      = NULL,
  100         .interp_path    = "/usr/libexec/ld-elf.so.1",
  101         .sysvec         = &elf32_freebsd_sysvec,
  102         .interp_newpath = NULL,
  103         .brand_note     = &elf32_freebsd_brandnote,
  104         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  105 };
  106 
  107 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
  108         (sysinit_cfunc_t) elf32_insert_brand_entry,
  109         &freebsd_brand_oinfo);
  110 
  111 
  112 void
  113 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
  114     size_t *off __unused)
  115 {
  116 }
  117 
  118 
  119 /* Process one elf relocation with addend. */
  120 static int
  121 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  122     int type, int local, elf_lookup_fn lookup)
  123 {
  124         Elf_Addr *where;
  125         Elf_Addr addr;
  126         Elf_Addr addend;
  127         Elf_Word rtype, symidx;
  128         const Elf_Rel *rel;
  129         const Elf_Rela *rela;
  130 
  131         switch (type) {
  132         case ELF_RELOC_REL:
  133                 rel = (const Elf_Rel *)data;
  134                 where = (Elf_Addr *) (relocbase + rel->r_offset);
  135                 addend = *where;
  136                 rtype = ELF_R_TYPE(rel->r_info);
  137                 symidx = ELF_R_SYM(rel->r_info);
  138                 break;
  139         case ELF_RELOC_RELA:
  140                 rela = (const Elf_Rela *)data;
  141                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  142                 addend = rela->r_addend;
  143                 rtype = ELF_R_TYPE(rela->r_info);
  144                 symidx = ELF_R_SYM(rela->r_info);
  145                 break;
  146         default:
  147                 panic("unknown reloc type %d\n", type);
  148         }
  149 
  150         if (local) {
  151                 if (rtype == R_ARM_RELATIVE) {  /* A + B */
  152                         addr = elf_relocaddr(lf, relocbase + addend);
  153                         if (*where != addr)
  154                                 *where = addr;
  155                 }
  156                 return (0);
  157         }
  158 
  159         switch (rtype) {
  160 
  161                 case R_ARM_NONE:        /* none */
  162                         break;
  163 
  164                 case R_ARM_ABS32:
  165                         addr = lookup(lf, symidx, 1);
  166                         if (addr == 0)
  167                                 return -1;
  168                         if (*where != addr)
  169                                 *where = addr;
  170 
  171                         break;
  172 
  173                 case R_ARM_COPY:        /* none */
  174                         /*
  175                          * There shouldn't be copy relocations in kernel
  176                          * objects.
  177                          */
  178                         printf("kldload: unexpected R_COPY relocation\n");
  179                         return -1;
  180                         break;
  181 
  182                 case R_ARM_JUMP_SLOT:
  183                         addr = lookup(lf, symidx, 1);
  184                         if (addr) {
  185                                 *where = addr;
  186                                 return (0);
  187                         }
  188                         return (-1);
  189                 case R_ARM_RELATIVE:
  190                         break;
  191 
  192                 default:
  193                         printf("kldload: unexpected relocation type %d\n",
  194                                rtype);
  195                         return -1;
  196         }
  197         return(0);
  198 }
  199 
  200 int
  201 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  202     elf_lookup_fn lookup)
  203 {
  204 
  205         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  206 }
  207 
  208 int
  209 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  210     int type, elf_lookup_fn lookup)
  211 {
  212 
  213         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  214 }
  215 
  216 int
  217 elf_cpu_load_file(linker_file_t lf __unused)
  218 {
  219 
  220         cpu_idcache_wbinv_all();
  221         cpu_l2cache_wbinv_all();
  222         cpu_tlb_flushID();
  223         return (0);
  224 }
  225 
  226 int
  227 elf_cpu_unload_file(linker_file_t lf __unused)
  228 {
  229 
  230         return (0);
  231 }

Cache object: 0655187e0cef91f9a3fd67a1ea35990d


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