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 struct trampoline
  44 {
  45   grub_uint8_t code[0x28];
  46   grub_uint64_t addr;
  47 };
  48
  49 static const grub_uint8_t trampoline_code[0x28] =
  50 {
  51   /* 0:  */ 0x82, 0x10, 0x00, 0x0f,     /* mov  %o7, %g1 */
  52   /* 4:  */ 0x40, 0x00, 0x00, 0x02,     /* call  0xc */
  53   /* 8:  */ 0x01, 0x00, 0x00, 0x00,     /* nop */
  54   /* c:  */ 0x9e, 0x1b, 0xc0, 0x01,     /* xor  %o7, %g1, %o7 */
  55   /* 10: */ 0x82, 0x18, 0x40, 0x0f,     /* xor  %g1, %o7, %g1 */
  56   /* 14: */ 0x9e, 0x1b, 0xc0, 0x01,     /* xor  %o7, %g1, %o7 */
  57   /* 18: */ 0xc2, 0x58, 0x60, 0x24,     /* ldx  [ %g1 + 0x24 ], %g1 */
  58   /* 1c: */ 0x81, 0xc0, 0x40, 0x00,     /* jmp  %g1 */
  59   /* 20: */ 0x01, 0x00, 0x00, 0x00,     /* nop */
  60   /* 24: */ 0x01, 0x00, 0x00, 0x00,     /* nop */
  61 };
  62
  63 grub_err_t
  64 grub_arch_dl_get_tramp_got_size (const void *ehdr, grub_size_t *tramp,
  65                                  grub_size_t *got)
  66 {
  67   const Elf_Ehdr *e = ehdr;
  68   const Elf_Shdr *s;
  69   unsigned i;
  70
  71   *tramp = 0;
  72   *got = 0;
  73
  74   for (i = 0, s = (const Elf_Shdr *) ((grub_addr_t) e + e->e_shoff);
  75        i < e->e_shnum;
  76        i++, s = (const Elf_Shdr *) ((grub_addr_t) s + e->e_shentsize))
  77     if (s->sh_type == SHT_REL || s->sh_type == SHT_RELA)
  78       {
  79         const Elf_Rel *rel, *max;
  80
  81         for (rel = (const Elf_Rel *) ((grub_addr_t) e + s->sh_offset),
  82                max = rel + s->sh_size / s->sh_entsize;
  83              rel < max;
  84              rel = (const Elf_Rel *) ((grub_addr_t) rel + s->sh_entsize))
  85           switch (ELF_R_TYPE (rel->r_info))
  86             {
  87             case R_SPARC_WDISP30:
  88               {
  89                 *tramp += sizeof (struct trampoline);
  90                 break;
  91               }
  92             }
  93       }
  94
  95   return GRUB_ERR_NONE;
  96 }
  97
  98 /* Relocate symbols.  */
  99 grub_err_t
 100 grub_arch_dl_relocate_symbols (grub_dl_t mod, void *ehdr,
 101                                Elf_Shdr *s, grub_dl_segment_t seg)
 102 {
 103   Elf_Rela *rel, *max;
 104
 105   for (rel = (Elf_Rela *) ((char *) ehdr + s->sh_offset),
 106          max = (Elf_Rela *) ((char *) rel + s->sh_size);
 107        rel < max;
 108        rel = (Elf_Rela *) ((char *) rel + s->sh_entsize))
 109     {
 110       Elf_Word *addr;
 111       Elf_Sym *sym;
 112       Elf_Addr value;
 113
 114       if (seg->size < rel->r_offset)
 115         return grub_error (GRUB_ERR_BAD_MODULE,
 116                            "reloc offset is out of the segment");
 117
 118       addr = (Elf_Word *) ((char *) seg->addr + rel->r_offset);
 119       sym = (Elf_Sym *) ((char *) mod->symtab
 120                          + mod->symsize * ELF_R_SYM (rel->r_info));
 121
 122       value = sym->st_value + rel->r_addend;
 123       switch (ELF_R_TYPE (rel->r_info) & 0xff)
 124         {
 125         case R_SPARC_32: /* 3 V-word32 */
 126           if (value & 0xFFFFFFFF00000000)
 127             return grub_error (GRUB_ERR_BAD_MODULE,
 128                                "address out of 32 bits range");
 129           *addr = value;
 130           break;
 131         case R_SPARC_WDISP30: /* 7 V-disp30 */
 132           if (((value - (Elf_Addr) addr) & 0xFFFFFFFF00000000) &&
 133                (((value - (Elf_Addr) addr) & 0xFFFFFFFF00000000)
 134                 != 0xFFFFFFFF00000000))
 135             {
 136               struct trampoline *tp = mod->trampptr;
 137               mod->trampptr = tp + 1;
 138               grub_memcpy (tp->code, trampoline_code, sizeof (tp->code));
 139               tp->addr = value;
 140               value = (Elf_Addr) tp;
 141             }
 142
 143           if (((value - (Elf_Addr) addr) & 0xFFFFFFFF00000000) &&
 144               (((value - (Elf_Addr) addr) & 0xFFFFFFFF00000000)
 145                != 0xFFFFFFFF00000000))
 146             return grub_error (GRUB_ERR_BAD_MODULE,
 147                                "displacement out of 30 bits range");
 148           *addr = (*addr & 0xC0000000) |
 149             (((grub_int32_t) ((value - (Elf_Addr) addr) >> 2)) &
 150              0x3FFFFFFF);
 151           break;
 152         case R_SPARC_HH22: /* 9 V-imm22 */
 153           *addr = (*addr & 0xFFC00000) | ((value >> 42) & 0x3FFFFF);
 154           break;
 155         case R_SPARC_HM10: /* 12 T-simm13 */
 156           *addr = (*addr & 0xFFFFFC00) | ((value >> 32) & 0x3FF);
 157           break;
 158         case R_SPARC_HI22: /* 9 V-imm22 */
 159           if (value >> 32)
 160             return grub_error (GRUB_ERR_BAD_MODULE,
 161                                "address out of 32 bits range");
 162         case R_SPARC_LM22:
 163           *addr = (*addr & 0xFFC00000) | ((value >> 10) & 0x3FFFFF);
 164           break;
 165         case R_SPARC_LO10: /* 12 T-simm13 */
 166           *addr = (*addr & 0xFFFFFC00) | (value & 0x3FF);
 167           break;
 168         case R_SPARC_64: /* 32 V-xwords64 */
 169           *(Elf_Xword *) addr = value;
 170           break;
 171         case R_SPARC_OLO10:
 172           *addr = (*addr & ~0x1fff)
 173             | (((value & 0x3ff) +
 174                 (ELF_R_TYPE (rel->r_info) >> 8))
 175                & 0x1fff);
 176           break;
 177         default:
 178           return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
 179                              N_("relocation 0x%x is not implemented yet"),
 180                              ELF_R_TYPE (rel->r_info));
 181         }
 182     }
 183
 184   return GRUB_ERR_NONE;
 185 }