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  * $FreeBSD$
   26  */
   27 
   28 #include <sys/param.h>
   29 #include <sys/kernel.h>
   30 #include <sys/systm.h>
   31 #include <sys/exec.h>
   32 #include <sys/imgact.h>
   33 #include <sys/malloc.h>
   34 #include <sys/proc.h>
   35 #include <sys/namei.h>
   36 #include <sys/fcntl.h>
   37 #include <sys/sysent.h>
   38 #include <sys/imgact_elf.h>
   39 #include <sys/syscall.h>
   40 #include <sys/signalvar.h>
   41 #include <sys/vnode.h>
   42 #include <sys/linker.h>
   43 
   44 #include <vm/vm.h>
   45 #include <vm/vm_param.h>
   46 
   47 #include <machine/cpu.h>
   48 #include <machine/elf.h>
   49 #include <machine/md_var.h>
   50 
   51 struct sysentvec elf32_freebsd_sysvec = {
   52         SYS_MAXSYSCALL,
   53         sysent,
   54         0,
   55         0,
   56         NULL,
   57         0,
   58         NULL,
   59         NULL,
   60         __elfN(freebsd_fixup),
   61         sendsig,
   62         sigcode,
   63         &szsigcode,
   64         NULL,
   65         "FreeBSD ELF32",
   66         __elfN(coredump),
   67         NULL,
   68         MINSIGSTKSZ,
   69         PAGE_SIZE,
   70         VM_MIN_ADDRESS,
   71         VM_MAXUSER_ADDRESS,
   72         USRSTACK,
   73         PS_STRINGS,
   74         VM_PROT_ALL,
   75         exec_copyout_strings,
   76         exec_setregs,
   77         NULL
   78 };
   79 
   80 static Elf32_Brandinfo freebsd_brand_info = {
   81                                                 ELFOSABI_FREEBSD,
   82                                                 EM_PPC,
   83                                                 "FreeBSD",
   84                                                 NULL,
   85                                                 "/libexec/ld-elf.so.1",
   86                                                 &elf32_freebsd_sysvec,
   87                                                 NULL,
   88                                           };
   89 
   90 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY,
   91         (sysinit_cfunc_t) elf32_insert_brand_entry,
   92         &freebsd_brand_info);
   93 
   94 static Elf32_Brandinfo freebsd_brand_oinfo = {
   95                                                 ELFOSABI_FREEBSD,
   96                                                 EM_PPC,
   97                                                 "FreeBSD",
   98                                                 NULL,
   99                                                 "/usr/libexec/ld-elf.so.1",
  100                                                 &elf32_freebsd_sysvec,
  101                                                 NULL,
  102                                           };
  103 
  104 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
  105         (sysinit_cfunc_t) elf32_insert_brand_entry,
  106         &freebsd_brand_oinfo);
  107 
  108 
  109 void
  110 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
  111     size_t *off __unused)
  112 {
  113 }
  114 
  115 
  116 /* Process one elf relocation with addend. */
  117 static int
  118 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  119     int type, int local, elf_lookup_fn lookup)
  120 {
  121         Elf_Addr *where;
  122         Elf_Half *hwhere;
  123         Elf_Addr addr;
  124         Elf_Addr addend;
  125         Elf_Word rtype, symidx;
  126         const Elf_Rela *rela;
  127 
  128         switch (type) {
  129         case ELF_RELOC_REL:
  130                 panic("PPC only supports RELA relocations");
  131                 break;
  132         case ELF_RELOC_RELA:
  133                 rela = (const Elf_Rela *)data;
  134                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  135                 hwhere = (Elf_Half *) (relocbase + rela->r_offset);
  136                 addend = rela->r_addend;
  137                 rtype = ELF_R_TYPE(rela->r_info);
  138                 symidx = ELF_R_SYM(rela->r_info);
  139                 break;
  140         default:
  141                 panic("elf_reloc: unknown relocation mode %d\n", type);
  142         }
  143 
  144         switch (rtype) {
  145 
  146         case R_PPC_NONE:
  147                 break;
  148 
  149         case R_PPC_ADDR32: /* word32 S + A */
  150                 addr = lookup(lf, symidx, 1);
  151                 if (addr == 0)
  152                         return -1;
  153                 addr += addend;
  154                 *where = addr;
  155                 break;
  156 
  157         case R_PPC_ADDR16_LO: /* #lo(S) */
  158                 addr = lookup(lf, symidx, 1);
  159                 if (addr == 0)
  160                         return -1;
  161                 /*
  162                  * addend values are sometimes relative to sections
  163                  * (i.e. .rodata) in rela, where in reality they
  164                  * are relative to relocbase. Detect this condition.
  165                  */
  166                 if (addr > relocbase && addr <= (relocbase + addend))
  167                         addr = relocbase + addend;
  168                 else
  169                         addr += addend;
  170                 *hwhere = addr & 0xffff;
  171                 break;
  172 
  173         case R_PPC_ADDR16_HA: /* #ha(S) */
  174                 addr = lookup(lf, symidx, 1);
  175                 if (addr == 0)
  176                         return -1;
  177                 /*
  178                  * addend values are sometimes relative to sections
  179                  * (i.e. .rodata) in rela, where in reality they
  180                  * are relative to relocbase. Detect this condition.
  181                  */
  182                 if (addr > relocbase && addr <= (relocbase + addend))
  183                         addr = relocbase + addend;
  184                 else
  185                         addr += addend;
  186                 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0))
  187                     & 0xffff;
  188                 break;
  189 
  190         case R_PPC_RELATIVE: /* word32 B + A */
  191                 *where = relocbase + addend;
  192                 break;
  193 
  194         default:
  195                 printf("kldload: unexpected relocation type %d\n",
  196                     (int) rtype);
  197                 return -1;
  198         }
  199         return(0);
  200 }
  201 
  202 int
  203 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  204     elf_lookup_fn lookup)
  205 {
  206 
  207         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  208 }
  209 
  210 int
  211 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  212     int type, elf_lookup_fn lookup)
  213 {
  214 
  215         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  216 }
  217 
  218 int
  219 elf_cpu_load_file(linker_file_t lf)
  220 {
  221         /* Only sync the cache for non-kernel modules */
  222         if (lf->id != 1)
  223                 __syncicache(lf->address, lf->size);
  224         return (0);
  225 }
  226 
  227 int
  228 elf_cpu_unload_file(linker_file_t lf __unused)
  229 {
  230 
  231         return (0);
  232 }

Cache object: 1a652e4dff70c9bf0898af74af15fc23

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

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