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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(PC32):
     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) - (Elf_Addr)where;
     38 		if (*where != tmp)
     39 			*where = tmp;
     40 		rdbg(dodebug, ("PC32 %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(GOT32):
     46 #endif
     47 	case R_TYPE(32):
     48 	case R_TYPE(GLOB_DAT):
     49 		def = _rtld_find_symdef(rela->r_info, obj, &defobj, false);
     50 		if (def == NULL)
     51 			return -1;
     52 
     53 		tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
     54 		    rela->r_addend);
     55 		if (*where != tmp)
     56 			*where = tmp;
     57 		rdbg(dodebug, ("32/GLOB_DAT %s in %s --> %p in %s",
     58 		    defobj->strtab + def->st_name, obj->path,
     59 		    (void *)*where, defobj->path));
     60 		break;
     61 
     62 	case R_TYPE(RELATIVE):
     63 		*where += (Elf_Addr)obj->relocbase;
     64 		rdbg(dodebug, ("RELATIVE in %s --> %p", obj->path,
     65 		    (void *)*where));
     66 		break;
     67 
     68 	case R_TYPE(COPY):
     69 		/*
     70 		 * These are deferred until all other relocations have
     71 		 * been done.  All we do here is make sure that the COPY
     72 		 * relocation is not in a shared library.  They are allowed
     73 		 * only in executable files.
     74 		 */
     75 		if (!obj->mainprog) {
     76 			_rtld_error(
     77 			"%s: Unexpected R_COPY relocation in shared library",
     78 			    obj->path);
     79 			return -1;
     80 		}
     81 		rdbg(dodebug, ("COPY (avoid in main)"));
     82 		break;
     83 
     84 	default:
     85 		def = _rtld_find_symdef(rela->r_info, obj, &defobj, true);
     86 		rdbg(dodebug, ("sym = %lu, type = %lu, offset = %p, "
     87 		    "addend = %p, contents = %p, symbol = %s",
     88 		    (u_long)ELF_R_SYM(rela->r_info),
     89 		    (u_long)ELF_R_TYPE(rela->r_info),
     90 		    (void *)rela->r_offset, (void *)rela->r_addend,
     91 		    (void *)*where,
     92 		    def ? defobj->strtab + def->st_name : "??"));
     93 		_rtld_error("%s: Unsupported relocation type %ld "
     94 		    "in non-PLT relocations\n",
     95 		    obj->path, (u_long) ELF_R_TYPE(rela->r_info));
     96 		return -1;
     97 	}
     98 	return 0;
     99 }
    100