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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_Rela *rela;
     20 
     21 	for (rela = obj->rela; rela < obj->relalim; rela++) {
     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 + rela->r_offset);
     28 
     29 		switch (ELF_R_TYPE(rela->r_info)) {
     30 		case R_TYPE(NONE):
     31 			break;
     32 
     33 #if 1 /* XXX should not occur */
     34 		case R_TYPE(GOT32):
     35 			def = _rtld_find_symdef(rela->r_info, obj, &defobj,
     36 			    false);
     37 			if (def == NULL)
     38 				return -1;
     39 
     40 			tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
     41 			    rela->r_addend);
     42 			if (*where != tmp)
     43 				*where = tmp;
     44 			rdbg(dodebug, ("GOT32 %s in %s --> %p in %s",
     45 			    defobj->strtab + def->st_name, obj->path,
     46 			    (void *)*where, defobj->path));
     47 			break;
     48 
     49 		case R_TYPE(REL32):
     50 			def = _rtld_find_symdef(rela->r_info, obj, &defobj,
     51 			    false);
     52 			if (def == NULL)
     53 				return -1;
     54 
     55 			*where += (Elf_Addr)(defobj->relocbase + def->st_value +
     56 			    rela->r_addend) - (Elf_Addr)where;
     57 			rdbg(dodebug, ("PC32 %s in %s --> %p in %s",
     58 			    defobj->strtab + def->st_name, obj->path,
     59 			    (void *)*where, defobj->path));
     60 			break;
     61 #endif
     62 
     63 		case R_TYPE(DIR32):
     64 			def = _rtld_find_symdef(rela->r_info, obj, &defobj,
     65 			    false);
     66 			if (def == NULL)
     67 				return -1;
     68 
     69 			*where += (Elf_Addr)(defobj->relocbase + def->st_value +
     70 			    rela->r_addend);
     71 			rdbg(dodebug, ("32 %s in %s --> %p in %s",
     72 			    defobj->strtab + def->st_name, obj->path,
     73 			    (void *)*where, defobj->path));
     74 			break;
     75 
     76 		case R_TYPE(GLOB_DAT):
     77 			def = _rtld_find_symdef(rela->r_info, obj, &defobj,
     78 			    false);
     79 			if (def == NULL)
     80 				return -1;
     81 
     82 			tmp = (Elf_Addr)(defobj->relocbase + def->st_value) +
     83 			    rela->r_addend;
     84 			if (*where != tmp)
     85 				*where = tmp;
     86 			rdbg(dodebug, ("GLOB_DAT %s in %s --> %p in %s",
     87 			    defobj->strtab + def->st_name, obj->path,
     88 			    (void *)*where, defobj->path));
     89 			break;
     90 
     91 		case R_TYPE(RELATIVE):
     92 			if (rela->r_addend)
     93 				*where = (Elf_Addr)obj->relocbase + rela->r_addend;
     94 			else
     95 				*where += (Elf_Addr)obj->relocbase;
     96 			rdbg(dodebug, ("RELATIVE in %s --> %p", obj->path,
     97 			    (void *)*where));
     98 			break;
     99 
    100 		case R_TYPE(COPY):
    101 			/*
    102 			 * These are deferred until all other relocations have
    103 			 * been done.  All we do here is make sure that the
    104 			 * COPY relocation is not in a shared library.  They
    105 			 * are allowed only in executable files.
    106 			 */
    107 			if (!obj->mainprog) {
    108 				_rtld_error(
    109 			"%s: Unexpected R_COPY relocation in shared library",
    110 				    obj->path);
    111 				return -1;
    112 			}
    113 			rdbg(dodebug, ("COPY (avoid in main)"));
    114 			break;
    115 
    116 		default:
    117 			def = _rtld_find_symdef(rela->r_info, obj, &defobj,
    118 			    true);
    119 			rdbg(dodebug, ("sym = %lu, type = %lu, offset = %p, "
    120 			    "addend = %p, contents = %p, symbol = %s",
    121 			    (u_long)ELF_R_SYM(rela->r_info),
    122 			    (u_long)ELF_R_TYPE(rela->r_info),
    123 			    (void *)rela->r_offset, (void *)rela->r_addend,
    124 			    (void *)*where,
    125 			    def ? defobj->strtab + def->st_name : "??"));
    126 			_rtld_error("%s: Unsupported relocation type %ld "
    127 			    "in non-PLT relocations\n",
    128 			    obj->path, (u_long) ELF_R_TYPE(rela->r_info));
    129 			return -1;
    130 		}
    131 	}
    132 	return 0;
    133 }
    134