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mdreloc.c revision 1.5 
      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 #ifdef COMBRELOC
     21 	unsigned long lastsym = -1;
     22 #endif
     23 	Elf_Addr target;
     24 
     25 	for (rel = obj->rel; rel < obj->rellim; rel++) {
     26 		Elf_Addr        *where;
     27 		const Elf_Sym   *def;
     28 		const Obj_Entry *defobj;
     29 		Elf_Addr         tmp;
     30 		unsigned long	 symnum;
     31 
     32 		where = (Elf_Addr *)(obj->relocbase + rel->r_offset);
     33 		symnum = ELF_R_SYM(rel->r_info);
     34 
     35 		switch (ELF_R_TYPE(rel->r_info)) {
     36 		case R_TYPE(NONE):
     37 			break;
     38 
     39 #if 1 /* XXX should not occur */
     40 		case R_TYPE(PC32):
     41 #ifdef COMBRELOC
     42 			if (symnum != lastsym) {
     43 #endif
     44 				def = _rtld_find_symdef(symnum, obj, &defobj,
     45 				    false);
     46 				if (def == NULL)
     47 					return -1;
     48 				target = (Elf_Addr)(defobj->relocbase +
     49 				    def->st_value);
     50 #ifdef COMBRELOC
     51 				lastsym = symnum;
     52 			}
     53 #endif
     54 
     55 			*where += target - (Elf_Addr)where;
     56 			rdbg(dodebug, ("PC32 %s in %s --> %p in %s",
     57 			    obj->strtab + obj->symtab[symnum].st_name,
     58 			    obj->path, (void *)*where, defobj->path));
     59 			break;
     60 
     61 		case R_TYPE(GOT32):
     62 #endif
     63 		case R_TYPE(32):
     64 		case R_TYPE(GLOB_DAT):
     65 #ifdef COMBRELOC
     66 			if (symnum != lastsym) {
     67 #endif
     68 				def = _rtld_find_symdef(symnum, obj, &defobj,
     69 				    false);
     70 				if (def == NULL)
     71 					return -1;
     72 				target = (Elf_Addr)(defobj->relocbase +
     73 				    def->st_value);
     74 #ifdef COMBRELOC
     75 				lastsym = symnum;
     76 			}
     77 #endif
     78 
     79 			tmp = target + *where;
     80 			if (*where != tmp)
     81 				*where = tmp;
     82 			rdbg(dodebug, ("32/GLOB_DAT %s in %s --> %p in %s",
     83 			    obj->strtab + obj->symtab[symnum].st_name,
     84 			    obj->path, (void *)*where, defobj->path));
     85 			break;
     86 
     87 		case R_TYPE(RELATIVE):
     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
     97 			 * COPY relocation is not in a shared library.  They
     98 			 * are allowed 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 			rdbg(dodebug, ("sym = %lu, type = %lu, offset = %p, "
    111 			    "contents = %p, symbol = %s",
    112 			    symnum, (u_long)ELF_R_TYPE(rel->r_info),
    113 			    (void *)rel->r_offset, (void *)*where,
    114 			    obj->strtab + obj->symtab[symnum].st_name));
    115 			_rtld_error("%s: Unsupported relocation type %ld "
    116 			    "in non-PLT relocations\n",
    117 			    obj->path, (u_long) ELF_R_TYPE(rel->r_info));
    118 			return -1;
    119 		}
    120 	}
    121 	return 0;
    122 }
    123