arch/all-pc/boot/grub2-aros/grub-core/kern/sparc64/dl.c

   1 /* dl.c - arch-dependent part of loadable module support */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2002,2004,2005,2007,2009  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 #include <grub/i18n.h>
  25
  26 /* Check if EHDR is a valid ELF header.  */
  27 grub_err_t
  28 grub_arch_dl_check_header (void *ehdr)
  29 {
  30   Elf_Ehdr *e = ehdr;
  31
  32   /* Check the magic numbers.  */
  33   if (e->e_ident[EI_CLASS] != ELFCLASS64
  34       || e->e_ident[EI_DATA] != ELFDATA2MSB
  35       || e->e_machine != EM_SPARCV9)
  36     return grub_error (GRUB_ERR_BAD_OS, N_("invalid arch-dependent ELF magic"));
  37
  38   return GRUB_ERR_NONE;
  39 }
  40
  41 #pragma GCC diagnostic ignored "-Wcast-align"
  42
  43 /* Relocate symbols.  */
  44 grub_err_t
  45 grub_arch_dl_relocate_symbols (grub_dl_t mod, void *ehdr)
  46 {
  47   Elf_Ehdr *e = ehdr;
  48   Elf_Shdr *s;
  49   Elf_Word entsize;
  50   unsigned i;
  51
  52   /* Find a symbol table.  */
  53   for (i = 0, s = (Elf_Shdr *) ((char *) e + e->e_shoff);
  54        i < e->e_shnum;
  55        i++, s = (Elf_Shdr *) ((char *) s + e->e_shentsize))
  56     if (s->sh_type == SHT_SYMTAB)
  57       break;
  58
  59   if (i == e->e_shnum)
  60     return grub_error (GRUB_ERR_BAD_MODULE, N_("no symbol table"));
  61
  62   entsize = s->sh_entsize;
  63
  64   for (i = 0, s = (Elf_Shdr *) ((char *) e + e->e_shoff);
  65        i < e->e_shnum;
  66        i++, s = (Elf_Shdr *) ((char *) s + e->e_shentsize))
  67     if (s->sh_type == SHT_RELA)
  68       {
  69         grub_dl_segment_t seg;
  70
  71         /* Find the target segment.  */
  72         for (seg = mod->segment; seg; seg = seg->next)
  73           if (seg->section == s->sh_info)
  74             break;
  75
  76         if (seg)
  77           {
  78             Elf_Rela *rel, *max;
  79
  80             for (rel = (Elf_Rela *) ((char *) e + s->sh_offset),
  81                    max = rel + s->sh_size / s->sh_entsize;
  82                  rel < max;
  83                  rel++)
  84               {
  85                 Elf_Word *addr;
  86                 Elf_Sym *sym;
  87                 Elf_Addr value;
  88
  89                 if (seg->size < rel->r_offset)
  90                   return grub_error (GRUB_ERR_BAD_MODULE,
  91                                      "reloc offset is out of the segment");
  92
  93                 addr = (Elf_Word *) ((char *) seg->addr + rel->r_offset);
  94                 sym = (Elf_Sym *) ((char *) mod->symtab
  95                                      + entsize * ELF_R_SYM (rel->r_info));
  96
  97                 value = sym->st_value + rel->r_addend;
  98                 switch (ELF_R_TYPE (rel->r_info) & 0xff)
  99                   {
 100                   case R_SPARC_32: /* 3 V-word32 */
 101                     if (value & 0xFFFFFFFF00000000)
 102                       return grub_error (GRUB_ERR_BAD_MODULE,
 103                                          "address out of 32 bits range");
 104                     *addr = value;
 105                     break;
 106                   case R_SPARC_WDISP30: /* 7 V-disp30 */
 107                     if (((value - (Elf_Addr) addr) & 0xFFFFFFFF00000000) &&
 108                         (((value - (Elf_Addr) addr) & 0xFFFFFFFF00000000)
 109                          != 0xFFFFFFFF00000000))
 110                       return grub_error (GRUB_ERR_BAD_MODULE,
 111                                          "displacement out of 30 bits range");
 112                     *addr = (*addr & 0xC0000000) |
 113                       (((grub_int32_t) ((value - (Elf_Addr) addr) >> 2)) &
 114                        0x3FFFFFFF);
 115                     break;
 116                   case R_SPARC_HH22: /* 9 V-imm22 */
 117                     *addr = (*addr & 0xFFC00000) | ((value >> 42) & 0x3FFFFF);
 118                     break;
 119                   case R_SPARC_HM10: /* 12 T-simm13 */
 120                     *addr = (*addr & 0xFFFFFC00) | ((value >> 32) & 0x3FF);
 121                     break;
 122                   case R_SPARC_HI22: /* 9 V-imm22 */
 123                     *addr = (*addr & 0xFFC00000) | ((value >> 10) & 0x3FFFFF);
 124                     break;
 125                   case R_SPARC_LO10: /* 12 T-simm13 */
 126                     *addr = (*addr & 0xFFFFFC00) | (value & 0x3FF);
 127                     break;
 128                   case R_SPARC_64: /* 32 V-xwords64 */
 129                     *(Elf_Xword *) addr = value;
 130                     break;
 131                   case R_SPARC_OLO10:
 132                     *addr = (*addr & ~0x1fff)
 133                       | (((value & 0x3ff) +
 134                           (ELF_R_TYPE (rel->r_info) >> 8))
 135                          & 0x1fff);
 136                     break;
 137                   default:
 138                     return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
 139                                        N_("relocation 0x%x is not implemented yet"),
 140                                        ELF_R_TYPE (rel->r_info));
 141                   }
 142               }
 143           }
 144       }
 145
 146   return GRUB_ERR_NONE;
 147 }