kern/sparc64/dl.c

   1 /* dl.c - arch-dependent part of loadable module support */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2002,2004,2005,2007  Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <grub/dl.h>
  21 #include <grub/elf.h>
  22 #include <grub/misc.h>
  23 #include <grub/err.h>
  24
  25 /* Check if EHDR is a valid ELF header.  */
  26 grub_err_t
  27 grub_arch_dl_check_header (void *ehdr)
  28 {
  29   Elf_Ehdr *e = ehdr;
  30
  31   /* Check the magic numbers.  */
  32   if (e->e_ident[EI_CLASS] != ELFCLASS64
  33       || e->e_ident[EI_DATA] != ELFDATA2MSB
  34       || e->e_machine != EM_SPARCV9)
  35     return grub_error (GRUB_ERR_BAD_OS, "invalid arch specific ELF magic");
  36
  37   return GRUB_ERR_NONE;
  38 }
  39
  40
  41 /* Relocate symbols.  */
  42 grub_err_t
  43 grub_arch_dl_relocate_symbols (grub_dl_t mod, void *ehdr)
  44 {
  45   Elf_Ehdr *e = ehdr;
  46   Elf_Shdr *s;
  47   Elf_Word entsize;
  48   unsigned i;
  49
  50   /* Find a symbol table.  */
  51   for (i = 0, s = (Elf_Shdr *) ((char *) e + e->e_shoff);
  52        i < e->e_shnum;
  53        i++, s = (Elf_Shdr *) ((char *) s + e->e_shentsize))
  54     if (s->sh_type == SHT_SYMTAB)
  55       break;
  56
  57   if (i == e->e_shnum)
  58     return grub_error (GRUB_ERR_BAD_MODULE, "no symtab found");
  59
  60   entsize = s->sh_entsize;
  61
  62   for (i = 0, s = (Elf_Shdr *) ((char *) e + e->e_shoff);
  63        i < e->e_shnum;
  64        i++, s = (Elf_Shdr *) ((char *) s + e->e_shentsize))
  65     if (s->sh_type == SHT_RELA)
  66       {
  67         grub_dl_segment_t seg;
  68
  69         /* Find the target segment.  */
  70         for (seg = mod->segment; seg; seg = seg->next)
  71           if (seg->section == s->sh_info)
  72             break;
  73
  74         if (seg)
  75           {
  76             Elf_Rela *rel, *max;
  77
  78             for (rel = (Elf_Rela *) ((char *) e + s->sh_offset),
  79                    max = rel + s->sh_size / s->sh_entsize;
  80                  rel < max;
  81                  rel++)
  82               {
  83                 Elf_Word *addr;
  84                 Elf_Sym *sym;
  85                 Elf_Addr value;
  86
  87                 if (seg->size < rel->r_offset)
  88                   return grub_error (GRUB_ERR_BAD_MODULE,
  89                                      "reloc offset is out of the segment");
  90
  91                 addr = (Elf_Word *) ((char *) seg->addr + rel->r_offset);
  92                 sym = (Elf_Sym *) ((char *) mod->symtab
  93                                      + entsize * ELF_R_SYM (rel->r_info));
  94
  95                 value = sym->st_value + rel->r_addend;
  96                 switch (ELF_R_TYPE (rel->r_info) & 0xff)
  97                   {
  98                   case R_SPARC_32: /* 3 V-word32 */
  99                     if (value & 0xFFFFFFFF00000000)
 100                       return grub_error (GRUB_ERR_BAD_MODULE,
 101                                          "Address out of 32 bits range");
 102                     *addr = value;
 103                     break;
 104                   case R_SPARC_WDISP30: /* 7 V-disp30 */
 105                     if (((value - (Elf_Addr) addr) & 0xFFFFFFFF00000000) &&
 106                         (((value - (Elf_Addr) addr) & 0xFFFFFFFF00000000)
 107                          != 0xFFFFFFFF00000000))
 108                       return grub_error (GRUB_ERR_BAD_MODULE,
 109                                          "Displacement out of 30 bits range");
 110                     *addr = (*addr & 0xC0000000) |
 111                       (((grub_int32_t) ((value - (Elf_Addr) addr) >> 2)) &
 112                        0x3FFFFFFF);
 113                     break;
 114                   case R_SPARC_HI22: /* 9 V-imm22 */
 115                     if (((grub_int32_t) value) & 0xFF00000000)
 116                       return grub_error (GRUB_ERR_BAD_MODULE,
 117                                          "High address out of 22 bits range");
 118                     *addr = (*addr & 0xFFC00000) | ((value >> 10) & 0x3FFFFF);
 119                     break;
 120                   case R_SPARC_LO10: /* 12 T-simm13 */
 121                     *addr = (*addr & 0xFFFFFC00) | (value & 0x3FF);
 122                     break;
 123                   case R_SPARC_64: /* 32 V-xwords64 */
 124                     *(Elf_Xword *) addr = value;
 125                     break;
 126                   case R_SPARC_OLO10:
 127                     *addr = (*addr & ~0x1fff)
 128                       | (((value & 0x3ff) +
 129                           (ELF_R_TYPE (rel->r_info) >> 8))
 130                          & 0x1fff);
 131                     break;
 132                   default:
 133                     return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
 134                                        "This relocation (%d) is not implemented yet",
 135                                        ELF_R_TYPE (rel->r_info));
 136                   }
 137               }
 138           }
 139       }
 140
 141   return GRUB_ERR_NONE;
 142 }