Home | History | Annotate | Line # | Download | only in vax
mdreloc.c revision 1.10 
      1 /*	$NetBSD: mdreloc.c,v 1.10 2002/09/11 14:19:31 junyoung Exp $	*/
      2 
      3 #include <sys/types.h>
      4 #include <sys/stat.h>
      5 
      6 #include "debug.h"
      7 #include "rtld.h"
      8 
      9 void
     10 _rtld_setup_pltgot(const Obj_Entry *obj)
     11 {
     12 	obj->pltgot[1] = (Elf_Addr) obj;
     13 	obj->pltgot[2] = (Elf_Addr) &_rtld_bind_start;
     14 }
     15 
     16 int
     17 _rtld_relocate_nonplt_objects(obj, self, dodebug)
     18 	const Obj_Entry *obj;
     19 	bool self;
     20 	bool dodebug;
     21 {
     22 	const Elf_Rela *rela;
     23 
     24 	for (rela = obj->rela; rela < obj->relalim; rela++) {
     25 		Elf_Addr        *where;
     26 		const Elf_Sym   *def;
     27 		const Obj_Entry *defobj;
     28 		Elf_Addr         tmp;
     29 		unsigned long	 symnum;
     30 
     31 		where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
     32 		symnum = ELF_R_SYM(rela->r_info);
     33 
     34 		switch (ELF_R_TYPE(rela->r_info)) {
     35 		case R_TYPE(NONE):
     36 			break;
     37 
     38 		case R_TYPE(32):	/* word32 S + A */
     39 		case R_TYPE(GLOB_DAT):	/* word32 S + A */
     40 			def = _rtld_find_symdef(symnum, obj, &defobj, false);
     41 			if (def == NULL)
     42 				return -1;
     43 
     44 			tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
     45 			    rela->r_addend);
     46 
     47 			if (*where != tmp)
     48 				*where = tmp;
     49 			rdbg(dodebug, ("32/GLOB_DAT %s in %s --> %p in %s",
     50 			    obj->strtab + obj->symtab[symnum].st_name,
     51 			    obj->path, (void *)*where, defobj->path));
     52 			break;
     53 
     54 		case R_TYPE(RELATIVE):	/* word32 B + A */
     55 			tmp = (Elf_Addr)(obj->relocbase + rela->r_addend);
     56 			if (*where != tmp)
     57 				*where = tmp;
     58 			rdbg(dodebug, ("RELATIVE in %s --> %p", obj->path,
     59 			    (void *)*where));
     60 			break;
     61 
     62 		case R_TYPE(COPY):
     63 			/*
     64 			 * These are deferred until all other relocations have
     65 			 * been done.  All we do here is make sure that the
     66 			 * COPY relocation is not in a shared library.  They
     67 			 * are allowed only in executable files.
     68 			 */
     69 			if (obj->isdynamic) {
     70 				_rtld_error(
     71 			"%s: Unexpected R_COPY relocation in shared library",
     72 				    obj->path);
     73 				return -1;
     74 			}
     75 			rdbg(dodebug, ("COPY (avoid in main)"));
     76 			break;
     77 
     78 		default:
     79 			rdbg(dodebug, ("sym = %lu, type = %lu, offset = %p, "
     80 			    "addend = %p, contents = %p, symbol = %s",
     81 			    symnum, (u_long)ELF_R_TYPE(rela->r_info),
     82 			    (void *)rela->r_offset, (void *)rela->r_addend,
     83 			    (void *)*where,
     84 			    obj->strtab + obj->symtab[symnum].st_name));
     85 			_rtld_error("%s: Unsupported relocation type %ld "
     86 			    "in non-PLT relocations\n",
     87 			    obj->path, (u_long) ELF_R_TYPE(rela->r_info));
     88 			return -1;
     89 		}
     90 	}
     91 	return 0;
     92 }
     93 
     94 int
     95 _rtld_relocate_plt_lazy(obj, dodebug)
     96 	const Obj_Entry *obj;
     97 	bool dodebug;
     98 {
     99 	const Elf_Rela *rela;
    100 
    101 	if (!obj->isdynamic)
    102 		return 0;
    103 
    104 	for (rela = obj->pltrela; rela < obj->pltrelalim; rela++) {
    105 		Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
    106 
    107 		assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
    108 
    109 		/* Just relocate the GOT slots pointing into the PLT */
    110 		*where += (Elf_Addr)obj->relocbase;
    111 		rdbg(dodebug, ("fixup !main in %s --> %p", obj->path,
    112 		    (void *)*where));
    113 	}
    114 
    115 	return 0;
    116 }
    117 
    118 int
    119 _rtld_relocate_plt_object(obj, rela, addrp, dodebug)
    120 	const Obj_Entry *obj;
    121 	const Elf_Rela *rela;
    122 	caddr_t *addrp;
    123 	bool dodebug;
    124 {
    125 	Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
    126 	Elf_Addr new_value;
    127 	const Elf_Sym  *def;
    128 	const Obj_Entry *defobj;
    129 
    130 	assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
    131 
    132 	def = _rtld_find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj, true);
    133 	if (def == NULL)
    134 		return -1;
    135 
    136 	new_value = (Elf_Addr)(defobj->relocbase + def->st_value +
    137 	    rela->r_addend);
    138 	rdbg(dodebug, ("bind now/fixup in %s --> old=%p new=%p",
    139 	    defobj->strtab + def->st_name, (void *)*where, (void *)new_value));
    140 	if (*where != new_value)
    141 		*where = new_value;
    142 
    143 	*addrp = (caddr_t)(new_value - rela->r_addend);
    144 	return 0;
    145 }
    146