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

   1 /*      $NetBSD: mdreloc.c,v 1.25 2009/03/16 02:46:47 lukem Exp $       */
   2
   3 #include <sys/cdefs.h>
   4 #ifndef lint
   5 __RCSID("$NetBSD: mdreloc.c,v 1.25 2009/03/16 02:46:47 lukem Exp $");
   6 #endif /* not lint */
   7
   8 #include <sys/cdefs.h>
   9 #ifndef lint
  10 __RCSID("$NetBSD: mdreloc.c,v 1.25 2009/03/16 02:46:47 lukem Exp $");
  11 #endif /* not lint */
  12
  13 #include <sys/types.h>
  14 #include <sys/stat.h>
  15
  16 #include "debug.h"
  17 #include "rtld.h"
  18
  19 void _rtld_bind_start(void);
  20 void _rtld_relocate_nonplt_self(Elf_Dyn *, Elf_Addr);
  21 caddr_t _rtld_bind(const Obj_Entry *, Elf_Word);
  22 static inline int _rtld_relocate_plt_object(const Obj_Entry *,
  23     const Elf_Rela *, Elf_Addr *);
  24
  25 void
  26 _rtld_setup_pltgot(const Obj_Entry *obj)
  27 {
  28         obj->pltgot[1] = (Elf_Addr) obj;
  29         obj->pltgot[2] = (Elf_Addr) &_rtld_bind_start;
  30 }
  31
  32 void
  33 _rtld_relocate_nonplt_self(Elf_Dyn *dynp, Elf_Addr relocbase)
  34 {
  35         const Elf_Rela *rela = 0, *relalim;
  36         Elf_Addr relasz = 0;
  37         Elf_Addr *where;
  38
  39         for (; dynp->d_tag != DT_NULL; dynp++) {
  40                 switch (dynp->d_tag) {
  41                 case DT_RELA:
  42                         rela = (const Elf_Rela *)(relocbase + dynp->d_un.d_ptr);
  43                         break;
  44                 case DT_RELASZ:
  45                         relasz = dynp->d_un.d_val;
  46                         break;
  47                 }
  48         }
  49         relalim = (const Elf_Rela *)((const uint8_t *)rela + relasz);
  50         for (; rela < relalim; rela++) {
  51                 where = (Elf_Addr *)(relocbase + rela->r_offset);
  52                 *where = (Elf_Addr)(relocbase + rela->r_addend);
  53         }
  54 }
  55
  56 int
  57 _rtld_relocate_nonplt_objects(const Obj_Entry *obj)
  58 {
  59         const Elf_Rela *rela;
  60
  61         for (rela = obj->rela; rela < obj->relalim; rela++) {
  62                 Elf_Addr        *where;
  63                 const Elf_Sym   *def;
  64                 const Obj_Entry *defobj;
  65                 Elf_Addr         tmp;
  66                 unsigned long    symnum;
  67
  68                 where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
  69                 symnum = ELF_R_SYM(rela->r_info);
  70
  71                 switch (ELF_R_TYPE(rela->r_info)) {
  72                 case R_TYPE(NONE):
  73                         break;
  74
  75 #if 1 /* XXX should not occur */
  76                 case R_TYPE(GOT32):
  77                         def = _rtld_find_symdef(symnum, obj, &defobj, false);
  78                         if (def == NULL)
  79                                 return -1;
  80
  81                         tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
  82                             rela->r_addend);
  83                         if (*where != tmp)
  84                                 *where = tmp;
  85                         rdbg(("GOT32 %s in %s --> %p in %s",
  86                             obj->strtab + obj->symtab[symnum].st_name,
  87                             obj->path, (void *)*where, defobj->path));
  88                         break;
  89
  90                 case R_TYPE(REL32):
  91                         def = _rtld_find_symdef(symnum, obj, &defobj, false);
  92                         if (def == NULL)
  93                                 return -1;
  94
  95                         tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
  96                             rela->r_addend) - (Elf_Addr)where;
  97                         if (*where != tmp)
  98                                 *where = tmp;
  99                         rdbg(("PC32 %s in %s --> %p in %s",
 100                             obj->strtab + obj->symtab[symnum].st_name,
 101                             obj->path, (void *)*where, defobj->path));
 102                         break;
 103 #endif
 104
 105                 case R_TYPE(DIR32):
 106                         def = _rtld_find_symdef(symnum, obj, &defobj, false);
 107                         if (def == NULL)
 108                                 return -1;
 109
 110                         tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
 111                             rela->r_addend);
 112                         if (*where != tmp)
 113                                 *where = tmp;
 114                         rdbg(("32 %s in %s --> %p in %s",
 115                             obj->strtab + obj->symtab[symnum].st_name,
 116                             obj->path, (void *)*where, defobj->path));
 117                         break;
 118
 119                 case R_TYPE(GLOB_DAT):
 120                         def = _rtld_find_symdef(symnum, obj, &defobj, false);
 121                         if (def == NULL)
 122                                 return -1;
 123
 124                         tmp = (Elf_Addr)(defobj->relocbase + def->st_value) +
 125                             rela->r_addend;
 126                         if (*where != tmp)
 127                                 *where = tmp;
 128                         rdbg(("GLOB_DAT %s in %s --> %p in %s",
 129                             obj->strtab + obj->symtab[symnum].st_name,
 130                             obj->path, (void *)*where, defobj->path));
 131                         break;
 132
 133                 case R_TYPE(RELATIVE):
 134                         if (rela->r_addend)
 135                                 *where = (Elf_Addr)obj->relocbase + rela->r_addend;
 136                         else
 137                                 *where += (Elf_Addr)obj->relocbase;
 138                         rdbg(("RELATIVE in %s --> %p", obj->path,
 139                             (void *)*where));
 140                         break;
 141
 142                 case R_TYPE(COPY):
 143                         /*
 144                          * These are deferred until all other relocations have
 145                          * been done.  All we do here is make sure that the
 146                          * COPY relocation is not in a shared library.  They
 147                          * are allowed only in executable files.
 148                          */
 149                         if (obj->isdynamic) {
 150                                 _rtld_error(
 151                         "%s: Unexpected R_COPY relocation in shared library",
 152                                     obj->path);
 153                                 return -1;
 154                         }
 155                         rdbg(("COPY (avoid in main)"));
 156                         break;
 157
 158                 default:
 159                         rdbg(("sym = %lu, type = %lu, offset = %p, "
 160                             "addend = %p, contents = %p, symbol = %s",
 161                             symnum, (u_long)ELF_R_TYPE(rela->r_info),
 162                             (void *)rela->r_offset, (void *)rela->r_addend,
 163                             (void *)*where,
 164                             obj->strtab + obj->symtab[symnum].st_name));
 165                         _rtld_error("%s: Unsupported relocation type %ld "
 166                             "in non-PLT relocations",
 167                             obj->path, (u_long) ELF_R_TYPE(rela->r_info));
 168                         return -1;
 169                 }
 170         }
 171         return 0;
 172 }
 173
 174 int
 175 _rtld_relocate_plt_lazy(const Obj_Entry *obj)
 176 {
 177         const Elf_Rela *rela;
 178
 179         if (!obj->relocbase)
 180                 return 0;
 181
 182         for (rela = obj->pltrela; rela < obj->pltrelalim; rela++) {
 183                 Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
 184
 185                 assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
 186
 187                 /* Just relocate the GOT slots pointing into the PLT */
 188                 *where += (Elf_Addr)obj->relocbase;
 189                 rdbg(("fixup !main in %s --> %p", obj->path, (void *)*where));
 190         }
 191
 192         return 0;
 193 }
 194
 195 caddr_t
 196 _rtld_bind(const Obj_Entry *obj, Elf_Word reloff)
 197 {
 198         const Elf_Rela *rela = (const Elf_Rela *)((const uint8_t *)obj->pltrela + reloff);
 199         Elf_Addr new_value;
 200         int err;
 201
 202         new_value = 0;  /* XXX gcc */
 203
 204         err = _rtld_relocate_plt_object(obj, rela, &new_value);
 205         if (err || new_value == 0)
 206                 _rtld_die();
 207
 208         return (caddr_t)new_value;
 209 }
 210
 211 int
 212 _rtld_relocate_plt_objects(const Obj_Entry *obj)
 213 {
 214         const Elf_Rela *rela = obj->pltrela;
 215
 216         for (; rela < obj->pltrelalim; rela++)
 217                 if (_rtld_relocate_plt_object(obj, rela, NULL) < 0)
 218                         return -1;
 219
 220         return 0;
 221 }
 222
 223 static inline int
 224 _rtld_relocate_plt_object(const Obj_Entry *obj, const Elf_Rela *rela, Elf_Addr *tp)
 225 {
 226         Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
 227         Elf_Addr new_value;
 228         const Elf_Sym  *def;
 229         const Obj_Entry *defobj;
 230
 231         assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
 232
 233         def = _rtld_find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj, true);
 234         if (def == NULL)
 235                 return -1;
 236
 237         new_value = (Elf_Addr)(defobj->relocbase + def->st_value);
 238         rdbg(("bind now/fixup in %s --> old=%p new=%p",
 239             defobj->strtab + def->st_name, (void *)*where, (void *)new_value));
 240         if (*where != new_value)
 241                 *where = new_value;
 242
 243         if (tp)
 244                 *tp = new_value;
 245
 246         return 0;
 247 }