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mdreloc.c revision 1.3 
      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_objects(obj, dodebug)
     16 	Obj_Entry *obj;
     17 	bool dodebug;
     18 {
     19 	const Elf_Rel *rel;
     20 
     21 	for (rel = obj->rel; rel < obj->rellim; rel++) {
     22 		Elf_Addr        *where;
     23 		const Elf_Sym   *def;
     24 		const Obj_Entry *defobj;
     25 		Elf_Addr         tmp;
     26 
     27 		where = (Elf_Addr *)(obj->relocbase + rel->r_offset);
     28 
     29 		switch (ELF_R_TYPE(rel->r_info)) {
     30 		case R_TYPE(NONE):
     31 			break;
     32 
     33 #if 1 /* XXX should not occur */
     34 		case R_TYPE(PC32):
     35 			def = _rtld_find_symdef(rel->r_info, obj, &defobj,
     36 			    false);
     37 			if (def == NULL)
     38 				return -1;
     39 
     40 			*where += (Elf_Addr)(defobj->relocbase + def->st_value) -
     41 			    (Elf_Addr)where;
     42 			rdbg(dodebug, ("PC32 %s in %s --> %p in %s",
     43 			    defobj->strtab + def->st_name, obj->path,
     44 			    (void *)*where, defobj->path));
     45 			break;
     46 
     47 		case R_TYPE(GOT32):
     48 #endif
     49 		case R_TYPE(32):
     50 		case R_TYPE(GLOB_DAT):
     51 			def = _rtld_find_symdef(rel->r_info, obj, &defobj,
     52 			    false);
     53 			if (def == NULL)
     54 				return -1;
     55 
     56 			tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
     57 			    *where);
     58 			if (*where != tmp)
     59 				*where = tmp;
     60 			rdbg(dodebug, ("32/GLOB_DAT %s in %s --> %p in %s",
     61 			    defobj->strtab + def->st_name, obj->path,
     62 			    (void *)*where, defobj->path));
     63 			break;
     64 
     65 		case R_TYPE(RELATIVE):
     66 			*where += (Elf_Addr)obj->relocbase;
     67 			rdbg(dodebug, ("RELATIVE in %s --> %p", obj->path,
     68 			    (void *)*where));
     69 			break;
     70 
     71 		case R_TYPE(COPY):
     72 			/*
     73 			 * These are deferred until all other relocations have
     74 			 * been done.  All we do here is make sure that the
     75 			 * COPY relocation is not in a shared library.  They
     76 			 * are allowed only in executable files.
     77 			 */
     78 			if (!obj->mainprog) {
     79 				_rtld_error(
     80 			"%s: Unexpected R_COPY relocation in shared library",
     81 				    obj->path);
     82 				return -1;
     83 			}
     84 			rdbg(dodebug, ("COPY (avoid in main)"));
     85 			break;
     86 
     87 		default:
     88 			def = _rtld_find_symdef(rel->r_info, obj, &defobj,
     89 			    true);
     90 			rdbg(dodebug, ("sym = %lu, type = %lu, offset = %p, "
     91 			    "contents = %p, symbol = %s",
     92 			    (u_long)ELF_R_SYM(rel->r_info),
     93 			    (u_long)ELF_R_TYPE(rel->r_info),
     94 			    (void *)rel->r_offset, (void *)*where,
     95 			    def ? defobj->strtab + def->st_name : "??"));
     96 			_rtld_error("%s: Unsupported relocation type %ld "
     97 			    "in non-PLT relocations\n",
     98 			    obj->path, (u_long) ELF_R_TYPE(rel->r_info));
     99 			return -1;
    100 		}
    101 	}
    102 	return 0;
    103 }
    104