Home | History | Annotate | Line # | Download | only in vax
mdreloc.c revision 1.9 
      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, self, dodebug)
     16 	const Obj_Entry *obj;
     17 	bool self;
     18 	bool dodebug;
     19 {
     20 	const Elf_Rela *rela;
     21 
     22 	for (rela = obj->rela; rela < obj->relalim; rela++) {
     23 		Elf_Addr        *where;
     24 		const Elf_Sym   *def;
     25 		const Obj_Entry *defobj;
     26 		Elf_Addr         tmp;
     27 		unsigned long	 symnum;
     28 
     29 		where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
     30 		symnum = ELF_R_SYM(rela->r_info);
     31 
     32 		switch (ELF_R_TYPE(rela->r_info)) {
     33 		case R_TYPE(NONE):
     34 			break;
     35 
     36 		case R_TYPE(32):	/* word32 S + A */
     37 		case R_TYPE(GLOB_DAT):	/* word32 S + A */
     38 			def = _rtld_find_symdef(symnum, obj, &defobj, false);
     39 			if (def == NULL)
     40 				return -1;
     41 
     42 			tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
     43 			    rela->r_addend);
     44 
     45 			if (*where != tmp)
     46 				*where = tmp;
     47 			rdbg(dodebug, ("32/GLOB_DAT %s in %s --> %p in %s",
     48 			    obj->strtab + obj->symtab[symnum].st_name,
     49 			    obj->path, (void *)*where, defobj->path));
     50 			break;
     51 
     52 		case R_TYPE(RELATIVE):	/* word32 B + A */
     53 			tmp = (Elf_Addr)(obj->relocbase + rela->r_addend);
     54 			if (*where != tmp)
     55 				*where = tmp;
     56 			rdbg(dodebug, ("RELATIVE in %s --> %p", obj->path,
     57 			    (void *)*where));
     58 			break;
     59 
     60 		case R_TYPE(COPY):
     61 			/*
     62 			 * These are deferred until all other relocations have
     63 			 * been done.  All we do here is make sure that the
     64 			 * COPY relocation is not in a shared library.  They
     65 			 * are allowed only in executable files.
     66 			 */
     67 			if (obj->isdynamic) {
     68 				_rtld_error(
     69 			"%s: Unexpected R_COPY relocation in shared library",
     70 				    obj->path);
     71 				return -1;
     72 			}
     73 			rdbg(dodebug, ("COPY (avoid in main)"));
     74 			break;
     75 
     76 		default:
     77 			rdbg(dodebug, ("sym = %lu, type = %lu, offset = %p, "
     78 			    "addend = %p, contents = %p, symbol = %s",
     79 			    symnum, (u_long)ELF_R_TYPE(rela->r_info),
     80 			    (void *)rela->r_offset, (void *)rela->r_addend,
     81 			    (void *)*where,
     82 			    obj->strtab + obj->symtab[symnum].st_name));
     83 			_rtld_error("%s: Unsupported relocation type %ld "
     84 			    "in non-PLT relocations\n",
     85 			    obj->path, (u_long) ELF_R_TYPE(rela->r_info));
     86 			return -1;
     87 		}
     88 	}
     89 	return 0;
     90 }
     91 
     92 int
     93 _rtld_relocate_plt_lazy(obj, dodebug)
     94 	const Obj_Entry *obj;
     95 	bool dodebug;
     96 {
     97 	const Elf_Rela *rela;
     98 
     99 	if (!obj->isdynamic)
    100 		return 0;
    101 
    102 	for (rela = obj->pltrela; rela < obj->pltrelalim; rela++) {
    103 		Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
    104 
    105 		assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
    106 
    107 		/* Just relocate the GOT slots pointing into the PLT */
    108 		*where += (Elf_Addr)obj->relocbase;
    109 		rdbg(dodebug, ("fixup !main in %s --> %p", obj->path,
    110 		    (void *)*where));
    111 	}
    112 
    113 	return 0;
    114 }
    115 
    116 int
    117 _rtld_relocate_plt_object(obj, rela, addrp, dodebug)
    118 	const Obj_Entry *obj;
    119 	const Elf_Rela *rela;
    120 	caddr_t *addrp;
    121 	bool dodebug;
    122 {
    123 	Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
    124 	Elf_Addr new_value;
    125 	const Elf_Sym  *def;
    126 	const Obj_Entry *defobj;
    127 
    128 	assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
    129 
    130 	def = _rtld_find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj, true);
    131 	if (def == NULL)
    132 		return -1;
    133 
    134 	new_value = (Elf_Addr)(defobj->relocbase + def->st_value +
    135 	    rela->r_addend);
    136 	rdbg(dodebug, ("bind now/fixup in %s --> old=%p new=%p",
    137 	    defobj->strtab + def->st_name, (void *)*where, (void *)new_value));
    138 	if (*where != new_value)
    139 		*where = new_value;
    140 
    141 	*addrp = (caddr_t)(new_value - rela->r_addend);
    142 	return 0;
    143 }
    144