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