libexec/ld.elf_so/arch/sh3/mdreloc.c

   1 /*      $NetBSD: mdreloc.c,v 1.28 2010/08/06 16:33:18 joerg Exp $       */
   2
   3 #include <sys/cdefs.h>
   4 #ifndef lint
   5 __RCSID("$NetBSD: mdreloc.c,v 1.28 2010/08/06 16:33:18 joerg Exp $");
   6 #endif /* not lint */
   7
   8 #include <sys/cdefs.h>
   9 #ifndef lint
  10 __RCSID("$NetBSD: mdreloc.c,v 1.28 2010/08/06 16:33:18 joerg Exp $");
  11 #endif /* not lint */
  12
  13 #include <sys/types.h>
  14
  15 #include "debug.h"
  16 #include "rtld.h"
  17
  18 void _rtld_bind_start(void);
  19 void _rtld_relocate_nonplt_self(Elf_Dyn *, Elf_Addr);
  20 caddr_t _rtld_bind(const Obj_Entry *, Elf_Word);
  21 static inline int _rtld_relocate_plt_object(const Obj_Entry *,
  22     const Elf_Rela *, Elf_Addr *);
  23
  24 void
  25 _rtld_setup_pltgot(const Obj_Entry *obj)
  26 {
  27         obj->pltgot[1] = (Elf_Addr) obj;
  28         obj->pltgot[2] = (Elf_Addr) &_rtld_bind_start;
  29 }
  30
  31 void
  32 _rtld_relocate_nonplt_self(Elf_Dyn *dynp, Elf_Addr relocbase)
  33 {
  34         const Elf_Rela *rela = 0, *relalim;
  35         Elf_Addr relasz = 0;
  36         Elf_Addr *where;
  37
  38         for (; dynp->d_tag != DT_NULL; dynp++) {
  39                 switch (dynp->d_tag) {
  40                 case DT_RELA:
  41                         rela = (const Elf_Rela *)(relocbase + dynp->d_un.d_ptr);
  42                         break;
  43                 case DT_RELASZ:
  44                         relasz = dynp->d_un.d_val;
  45                         break;
  46                 }
  47         }
  48         relalim = (const Elf_Rela *)((const uint8_t *)rela + relasz);
  49         for (; rela < relalim; rela++) {
  50                 where = (Elf_Addr *)(relocbase + rela->r_offset);
  51                 *where = (Elf_Addr)(relocbase + rela->r_addend);
  52         }
  53 }
  54
  55 int
  56 _rtld_relocate_nonplt_objects(Obj_Entry *obj)
  57 {
  58         const Elf_Rela *rela;
  59
  60         for (rela = obj->rela; rela < obj->relalim; rela++) {
  61                 Elf_Addr        *where;
  62                 const Elf_Sym   *def;
  63                 const Obj_Entry *defobj;
  64                 Elf_Addr         tmp;
  65                 unsigned long    symnum;
  66
  67                 where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
  68                 symnum = ELF_R_SYM(rela->r_info);
  69
  70                 switch (ELF_R_TYPE(rela->r_info)) {
  71                 case R_TYPE(NONE):
  72                         break;
  73
  74 #if 1 /* XXX should not occur */
  75                 case R_TYPE(GOT32):
  76                         def = _rtld_find_symdef(symnum, obj, &defobj, false);
  77                         if (def == NULL)
  78                                 return -1;
  79
  80                         tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
  81                             rela->r_addend);
  82                         if (*where != tmp)
  83                                 *where = tmp;
  84                         rdbg(("GOT32 %s in %s --> %p in %s",
  85                             obj->strtab + obj->symtab[symnum].st_name,
  86                             obj->path, (void *)*where, defobj->path));
  87                         break;
  88
  89                 case R_TYPE(REL32):
  90                         def = _rtld_find_symdef(symnum, obj, &defobj, false);
  91                         if (def == NULL)
  92                                 return -1;
  93
  94                         tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
  95                             rela->r_addend) - (Elf_Addr)where;
  96                         if (*where != tmp)
  97                                 *where = tmp;
  98                         rdbg(("PC32 %s in %s --> %p in %s",
  99                             obj->strtab + obj->symtab[symnum].st_name,
 100                             obj->path, (void *)*where, defobj->path));
 101                         break;
 102 #endif
 103
 104                 case R_TYPE(DIR32):
 105                         def = _rtld_find_symdef(symnum, obj, &defobj, false);
 106                         if (def == NULL)
 107                                 return -1;
 108
 109                         tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
 110                             rela->r_addend);
 111                         if (*where != tmp)
 112                                 *where = tmp;
 113                         rdbg(("32 %s in %s --> %p in %s",
 114                             obj->strtab + obj->symtab[symnum].st_name,
 115                             obj->path, (void *)*where, defobj->path));
 116                         break;
 117
 118                 case R_TYPE(GLOB_DAT):
 119                         def = _rtld_find_symdef(symnum, obj, &defobj, false);
 120                         if (def == NULL)
 121                                 return -1;
 122
 123                         tmp = (Elf_Addr)(defobj->relocbase + def->st_value) +
 124                             rela->r_addend;
 125                         if (*where != tmp)
 126                                 *where = tmp;
 127                         rdbg(("GLOB_DAT %s in %s --> %p in %s",
 128                             obj->strtab + obj->symtab[symnum].st_name,
 129                             obj->path, (void *)*where, defobj->path));
 130                         break;
 131
 132                 case R_TYPE(RELATIVE):
 133                         if (rela->r_addend)
 134                                 *where = (Elf_Addr)obj->relocbase + rela->r_addend;
 135                         else
 136                                 *where += (Elf_Addr)obj->relocbase;
 137                         rdbg(("RELATIVE in %s --> %p", obj->path,
 138                             (void *)*where));
 139                         break;
 140
 141                 case R_TYPE(COPY):
 142                         /*
 143                          * These are deferred until all other relocations have
 144                          * been done.  All we do here is make sure that the
 145                          * COPY relocation is not in a shared library.  They
 146                          * are allowed only in executable files.
 147                          */
 148                         if (obj->isdynamic) {
 149                                 _rtld_error(
 150                         "%s: Unexpected R_COPY relocation in shared library",
 151                                     obj->path);
 152                                 return -1;
 153                         }
 154                         rdbg(("COPY (avoid in main)"));
 155                         break;
 156
 157                 default:
 158                         rdbg(("sym = %lu, type = %lu, offset = %p, "
 159                             "addend = %p, contents = %p, symbol = %s",
 160                             symnum, (u_long)ELF_R_TYPE(rela->r_info),
 161                             (void *)rela->r_offset, (void *)rela->r_addend,
 162                             (void *)*where,
 163                             obj->strtab + obj->symtab[symnum].st_name));
 164                         _rtld_error("%s: Unsupported relocation type %ld "
 165                             "in non-PLT relocations",
 166                             obj->path, (u_long) ELF_R_TYPE(rela->r_info));
 167                         return -1;
 168                 }
 169         }
 170         return 0;
 171 }
 172
 173 int
 174 _rtld_relocate_plt_lazy(const Obj_Entry *obj)
 175 {
 176         const Elf_Rela *rela;
 177
 178         if (!obj->relocbase)
 179                 return 0;
 180
 181         for (rela = obj->pltrela; rela < obj->pltrelalim; rela++) {
 182                 Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
 183
 184                 assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
 185
 186                 /* Just relocate the GOT slots pointing into the PLT */
 187                 *where += (Elf_Addr)obj->relocbase;
 188                 rdbg(("fixup !main in %s --> %p", obj->path, (void *)*where));
 189         }
 190
 191         return 0;
 192 }
 193
 194 caddr_t
 195 _rtld_bind(const Obj_Entry *obj, Elf_Word reloff)
 196 {
 197         const Elf_Rela *rela = (const Elf_Rela *)((const uint8_t *)obj->pltrela + reloff);
 198         Elf_Addr new_value;
 199         int err;
 200
 201         new_value = 0;  /* XXX gcc */
 202
 203         err = _rtld_relocate_plt_object(obj, rela, &new_value);
 204         if (err)
 205                 _rtld_die();
 206
 207         return (caddr_t)new_value;
 208 }
 209
 210 int
 211 _rtld_relocate_plt_objects(const Obj_Entry *obj)
 212 {
 213         const Elf_Rela *rela = obj->pltrela;
 214
 215         for (; rela < obj->pltrelalim; rela++)
 216                 if (_rtld_relocate_plt_object(obj, rela, NULL) < 0)
 217                         return -1;
 218
 219         return 0;
 220 }
 221
 222 static inline int
 223 _rtld_relocate_plt_object(const Obj_Entry *obj, const Elf_Rela *rela, Elf_Addr *tp)
 224 {
 225         Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
 226         Elf_Addr new_value;
 227         const Elf_Sym  *def;
 228         const Obj_Entry *defobj;
 229         unsigned long info = rela->r_info;
 230
 231         assert(ELF_R_TYPE(info) == R_TYPE(JMP_SLOT));
 232
 233         def = _rtld_find_plt_symdef(ELF_R_SYM(info), obj, &defobj, tp != NULL);
 234         if (__predict_false(def == NULL))
 235                 return -1;
 236         if (__predict_false(def == &_rtld_sym_zero))
 237                 return 0;
 238
 239         new_value = (Elf_Addr)(defobj->relocbase + def->st_value);
 240         rdbg(("bind now/fixup in %s --> old=%p new=%p",
 241             defobj->strtab + def->st_name, (void *)*where, (void *)new_value));
 242         if (*where != new_value)
 243                 *where = new_value;
 244
 245         if (tp)
 246                 *tp = new_value;
 247
 248         return 0;
 249 }