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mdreloc.c revision 1.10 
      1 /*	$NetBSD: mdreloc.c,v 1.10 2002/09/11 14:19:30 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 #if 1 /* XXX should not occur */
     39 		case R_TYPE(PC32):
     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) - (Elf_Addr)where;
     46 			if (*where != tmp)
     47 				*where = tmp;
     48 			rdbg(dodebug, ("PC32 %s in %s --> %p in %s",
     49 			    obj->strtab + obj->symtab[symnum].st_name,
     50 			    obj->path, (void *)*where, defobj->path));
     51 			break;
     52 
     53 		case R_TYPE(GOT32):
     54 #endif
     55 		case R_TYPE(32):
     56 		case R_TYPE(GLOB_DAT):
     57 			def = _rtld_find_symdef(symnum, obj, &defobj, false);
     58 			if (def == NULL)
     59 				return -1;
     60 
     61 			tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
     62 			    rela->r_addend);
     63 			if (*where != tmp)
     64 				*where = tmp;
     65 			rdbg(dodebug, ("32/GLOB_DAT %s in %s --> %p in %s",
     66 			    obj->strtab + obj->symtab[symnum].st_name,
     67 			    obj->path, (void *)*where, defobj->path));
     68 			break;
     69 
     70 		case R_TYPE(RELATIVE):
     71 			*where += (Elf_Addr)obj->relocbase;
     72 			rdbg(dodebug, ("RELATIVE in %s --> %p", obj->path,
     73 			    (void *)*where));
     74 			break;
     75 
     76 		case R_TYPE(COPY):
     77 			/*
     78 			 * These are deferred until all other relocations have
     79 			 * been done.  All we do here is make sure that the
     80 			 * COPY relocation is not in a shared library.  They
     81 			 * are allowed only in executable files.
     82 			 */
     83 			if (obj->isdynamic) {
     84 				_rtld_error(
     85 			"%s: Unexpected R_COPY relocation in shared library",
     86 				    obj->path);
     87 				return -1;
     88 			}
     89 			rdbg(dodebug, ("COPY (avoid in main)"));
     90 			break;
     91 
     92 		default:
     93 			rdbg(dodebug, ("sym = %lu, type = %lu, offset = %p, "
     94 			    "addend = %p, contents = %p, symbol = %s",
     95 			    symnum, (u_long)ELF_R_TYPE(rela->r_info),
     96 			    (void *)rela->r_offset, (void *)rela->r_addend,
     97 			    (void *)*where,
     98 			    obj->strtab + obj->symtab[symnum].st_name));
     99 			_rtld_error("%s: Unsupported relocation type %ld "
    100 			    "in non-PLT relocations\n",
    101 			    obj->path, (u_long) ELF_R_TYPE(rela->r_info));
    102 			return -1;
    103 		}
    104 	}
    105 	return 0;
    106 }
    107 
    108 int
    109 _rtld_relocate_plt_lazy(obj, dodebug)
    110 	const Obj_Entry *obj;
    111 	bool dodebug;
    112 {
    113 	const Elf_Rela *rela;
    114 
    115 	if (!obj->isdynamic)
    116 		return 0;
    117 
    118 	for (rela = obj->pltrela; rela < obj->pltrelalim; rela++) {
    119 		Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
    120 
    121 		assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
    122 
    123 		/* Just relocate the GOT slots pointing into the PLT */
    124 		*where += (Elf_Addr)obj->relocbase;
    125 		rdbg(dodebug, ("fixup !main in %s --> %p", obj->path,
    126 		    (void *)*where));
    127 	}
    128 
    129 	return 0;
    130 }
    131 
    132 int
    133 _rtld_relocate_plt_object(obj, rela, addrp, dodebug)
    134 	const Obj_Entry *obj;
    135 	const Elf_Rela *rela;
    136 	caddr_t *addrp;
    137 	bool dodebug;
    138 {
    139 	Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
    140 	Elf_Addr new_value;
    141 	const Elf_Sym  *def;
    142 	const Obj_Entry *defobj;
    143 
    144 	assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
    145 
    146 	def = _rtld_find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj, true);
    147 	if (def == NULL)
    148 		return -1;
    149 
    150 	new_value = (Elf_Addr)(defobj->relocbase + def->st_value);
    151 	rdbg(dodebug, ("bind now/fixup in %s --> old=%p new=%p",
    152 	    defobj->strtab + def->st_name, (void *)*where, (void *)new_value));
    153 	if (*where != new_value)
    154 		*where = new_value;
    155 
    156 	*addrp = (caddr_t)new_value;
    157 	return 0;
    158 }
    159