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mdreloc.c revision 1.2 
      1 #include <sys/types.h>
      2 #include <sys/stat.h>
      3 
      4 #include "debug.h"
      5 #include "rtld.h"
      6 
      7 void
      8 _rtld_setup_pltgot(const Obj_Entry *obj)
      9 {
     10 	obj->pltgot[1] = (Elf_Addr) obj;
     11 	obj->pltgot[2] = (Elf_Addr) &_rtld_bind_start;
     12 }
     13 
     14 int
     15 _rtld_relocate_nonplt_object(obj, rela, dodebug)
     16 	Obj_Entry *obj;
     17 	const Elf_Rela *rela;
     18 	bool dodebug;
     19 {
     20 	Elf_Addr        *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
     21 	const Elf_Sym   *def;
     22 	const Obj_Entry *defobj;
     23 	Elf_Addr         tmp;
     24 
     25 	switch (ELF_R_TYPE(rela->r_info)) {
     26 
     27 	case R_TYPE(NONE):
     28 		break;
     29 
     30 #if 1 /* XXX should not occur */
     31 	case R_TYPE(GOT32):
     32 		def = _rtld_find_symdef(rela->r_info, obj, &defobj, false);
     33 		if (def == NULL)
     34 			return -1;
     35 
     36 		tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
     37 		    rela->r_addend);
     38 		if (*where != tmp)
     39 			*where = tmp;
     40 		rdbg(dodebug, ("GOT32 %s in %s --> %p in %s",
     41 		    defobj->strtab + def->st_name, obj->path,
     42 		    (void *)*where, defobj->path));
     43 		break;
     44 
     45 	case R_TYPE(REL32):
     46 		def = _rtld_find_symdef(rela->r_info, obj, &defobj, false);
     47 		if (def == NULL)
     48 			return -1;
     49 
     50 		*where += (Elf_Addr)(defobj->relocbase + def->st_value +
     51 		    rela->r_addend) - (Elf_Addr)where;
     52 		rdbg(dodebug, ("PC32 %s in %s --> %p in %s",
     53 		    defobj->strtab + def->st_name, obj->path,
     54 		    (void *)*where, defobj->path));
     55 		break;
     56 #endif
     57 
     58 	case R_TYPE(DIR32):
     59 		def = _rtld_find_symdef(rela->r_info, obj, &defobj, false);
     60 		if (def == NULL)
     61 			return -1;
     62 
     63 		*where += (Elf_Addr)(defobj->relocbase + def->st_value +
     64 		    rela->r_addend);
     65 		rdbg(dodebug, ("32 %s in %s --> %p in %s",
     66 		    defobj->strtab + def->st_name, obj->path,
     67 		    (void *)*where, defobj->path));
     68 		break;
     69 
     70 	case R_TYPE(GLOB_DAT):
     71 		def = _rtld_find_symdef(rela->r_info, obj, &defobj, false);
     72 		if (def == NULL)
     73 			return -1;
     74 
     75 		tmp = (Elf_Addr)(defobj->relocbase + def->st_value) +
     76 		    rela->r_addend;
     77 		if (*where != tmp)
     78 			*where = tmp;
     79 		rdbg(dodebug, ("GLOB_DAT %s in %s --> %p in %s",
     80 		    defobj->strtab + def->st_name, obj->path,
     81 		    (void *)*where, defobj->path));
     82 		break;
     83 
     84 	case R_TYPE(RELATIVE):
     85 		if (rela->r_addend)
     86 			*where = (Elf_Addr)obj->relocbase + rela->r_addend;
     87 		else
     88 			*where += (Elf_Addr)obj->relocbase;
     89 		rdbg(dodebug, ("RELATIVE in %s --> %p", obj->path,
     90 		    (void *)*where));
     91 		break;
     92 
     93 	case R_TYPE(COPY):
     94 		/*
     95 		 * These are deferred until all other relocations have
     96 		 * been done.  All we do here is make sure that the COPY
     97 		 * relocation is not in a shared library.  They are allowed
     98 		 * only in executable files.
     99 		 */
    100 		if (!obj->mainprog) {
    101 			_rtld_error(
    102 			"%s: Unexpected R_COPY relocation in shared library",
    103 			    obj->path);
    104 			return -1;
    105 		}
    106 		rdbg(dodebug, ("COPY (avoid in main)"));
    107 		break;
    108 
    109 	default:
    110 		def = _rtld_find_symdef(rela->r_info, obj, &defobj, true);
    111 		rdbg(dodebug, ("sym = %lu, type = %lu, offset = %p, "
    112 		    "addend = %p, contents = %p, symbol = %s",
    113 		    (u_long)ELF_R_SYM(rela->r_info),
    114 		    (u_long)ELF_R_TYPE(rela->r_info),
    115 		    (void *)rela->r_offset, (void *)rela->r_addend,
    116 		    (void *)*where,
    117 		    def ? defobj->strtab + def->st_name : "??"));
    118 		_rtld_error("%s: Unsupported relocation type %ld "
    119 		    "in non-PLT relocations\n",
    120 		    obj->path, (u_long) ELF_R_TYPE(rela->r_info));
    121 		return -1;
    122 	}
    123 	return 0;
    124 }
    125