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                                                 BI_CAN_EXEC_DYN,
   89                                           };
   90 
   91 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY,
   92         (sysinit_cfunc_t) elf32_insert_brand_entry,
   93         &freebsd_brand_info);
   94 
   95 static Elf32_Brandinfo freebsd_brand_oinfo = {
   96                                                 ELFOSABI_FREEBSD,
   97                                                 EM_PPC,
   98                                                 "FreeBSD",
   99                                                 NULL,
  100                                                 "/usr/libexec/ld-elf.so.1",
  101                                                 &elf32_freebsd_sysvec,
  102                                                 NULL,
  103                                                 BI_CAN_EXEC_DYN,
  104                                           };
  105 
  106 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
  107         (sysinit_cfunc_t) elf32_insert_brand_entry,
  108         &freebsd_brand_oinfo);
  109 
  110 
  111 void
  112 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
  113     size_t *off __unused)
  114 {
  115 }
  116 
  117 
  118 /* Process one elf relocation with addend. */
  119 static int
  120 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  121     int type, int local, elf_lookup_fn lookup)
  122 {
  123         Elf_Addr *where;
  124         Elf_Half *hwhere;
  125         Elf_Addr addr;
  126         Elf_Addr addend;
  127         Elf_Word rtype, symidx;
  128         const Elf_Rela *rela;
  129 
  130         switch (type) {
  131         case ELF_RELOC_REL:
  132                 panic("PPC only supports RELA relocations");
  133                 break;
  134         case ELF_RELOC_RELA:
  135                 rela = (const Elf_Rela *)data;
  136                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  137                 hwhere = (Elf_Half *) (relocbase + rela->r_offset);
  138                 addend = rela->r_addend;
  139                 rtype = ELF_R_TYPE(rela->r_info);
  140                 symidx = ELF_R_SYM(rela->r_info);
  141                 break;
  142         default:
  143                 panic("elf_reloc: unknown relocation mode %d\n", type);
  144         }
  145 
  146         switch (rtype) {
  147 
  148         case R_PPC_NONE:
  149                 break;
  150 
  151         case R_PPC_ADDR32: /* word32 S + A */
  152                 addr = lookup(lf, symidx, 1);
  153                 if (addr == 0)
  154                         return -1;
  155                 addr += addend;
  156                 *where = addr;
  157                 break;
  158 
  159         case R_PPC_ADDR16_LO: /* #lo(S) */
  160                 addr = lookup(lf, symidx, 1);
  161                 if (addr == 0)
  162                         return -1;
  163                 /*
  164                  * addend values are sometimes relative to sections
  165                  * (i.e. .rodata) in rela, where in reality they
  166                  * are relative to relocbase. Detect this condition.
  167                  */
  168                 if (addr > relocbase && addr <= (relocbase + addend))
  169                         addr = relocbase + addend;
  170                 else
  171                         addr += addend;
  172                 *hwhere = addr & 0xffff;
  173                 break;
  174 
  175         case R_PPC_ADDR16_HA: /* #ha(S) */
  176                 addr = lookup(lf, symidx, 1);
  177                 if (addr == 0)
  178                         return -1;
  179                 /*
  180                  * addend values are sometimes relative to sections
  181                  * (i.e. .rodata) in rela, where in reality they
  182                  * are relative to relocbase. Detect this condition.
  183                  */
  184                 if (addr > relocbase && addr <= (relocbase + addend))
  185                         addr = relocbase + addend;
  186                 else
  187                         addr += addend;
  188                 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0))
  189                     & 0xffff;
  190                 break;
  191 
  192         case R_PPC_RELATIVE: /* word32 B + A */
  193                 *where = relocbase + addend;
  194                 break;
  195 
  196         default:
  197                 printf("kldload: unexpected relocation type %d\n",
  198                     (int) rtype);
  199                 return -1;
  200         }
  201         return(0);
  202 }
  203 
  204 int
  205 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  206     elf_lookup_fn lookup)
  207 {
  208 
  209         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  210 }
  211 
  212 int
  213 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  214     int type, elf_lookup_fn lookup)
  215 {
  216 
  217         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  218 }
  219 
  220 int
  221 elf_cpu_load_file(linker_file_t lf)
  222 {
  223         /* Only sync the cache for non-kernel modules */
  224         if (lf->id != 1)
  225                 __syncicache(lf->address, lf->size);
  226         return (0);
  227 }
  228 
  229 int
  230 elf_cpu_unload_file(linker_file_t lf __unused)
  231 {
  232 
  233         return (0);
  234 }

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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