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mdreloc.c revision 1.8 
      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 	const 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 		unsigned long	 symnum;
     27 
     28 		where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
     29 		symnum = ELF_R_SYM(rela->r_info);
     30 
     31 		switch (ELF_R_TYPE(rela->r_info)) {
     32 		case R_TYPE(NONE):
     33 			break;
     34 
     35 #if 1 /* XXX should not occur */
     36 		case R_TYPE(PC32):
     37 			def = _rtld_find_symdef(symnum, obj, &defobj, false);
     38 			if (def == NULL)
     39 				return -1;
     40 
     41 			tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
     42 			    rela->r_addend) - (Elf_Addr)where;
     43 			if (*where != tmp)
     44 				*where = tmp;
     45 			rdbg(dodebug, ("PC32 %s in %s --> %p in %s",
     46 			    obj->strtab + obj->symtab[symnum].st_name,
     47 			    obj->path, (void *)*where, defobj->path));
     48 			break;
     49 
     50 		case R_TYPE(GOT32):
     51 #endif
     52 		case R_TYPE(32):
     53 		case R_TYPE(GLOB_DAT):
     54 			def = _rtld_find_symdef(symnum, obj, &defobj, false);
     55 			if (def == NULL)
     56 				return -1;
     57 
     58 			tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
     59 			    rela->r_addend);
     60 			if (*where != tmp)
     61 				*where = tmp;
     62 			rdbg(dodebug, ("32/GLOB_DAT %s in %s --> %p in %s",
     63 			    obj->strtab + obj->symtab[symnum].st_name,
     64 			    obj->path, (void *)*where, defobj->path));
     65 			break;
     66 
     67 		case R_TYPE(RELATIVE):
     68 			*where += (Elf_Addr)obj->relocbase;
     69 			rdbg(dodebug, ("RELATIVE in %s --> %p", obj->path,
     70 			    (void *)*where));
     71 			break;
     72 
     73 		case R_TYPE(COPY):
     74 			/*
     75 			 * These are deferred until all other relocations have
     76 			 * been done.  All we do here is make sure that the
     77 			 * COPY relocation is not in a shared library.  They
     78 			 * are allowed only in executable files.
     79 			 */
     80 			if (obj->isdynamic) {
     81 				_rtld_error(
     82 			"%s: Unexpected R_COPY relocation in shared library",
     83 				    obj->path);
     84 				return -1;
     85 			}
     86 			rdbg(dodebug, ("COPY (avoid in main)"));
     87 			break;
     88 
     89 		default:
     90 			rdbg(dodebug, ("sym = %lu, type = %lu, offset = %p, "
     91 			    "addend = %p, contents = %p, symbol = %s",
     92 			    symnum, (u_long)ELF_R_TYPE(rela->r_info),
     93 			    (void *)rela->r_offset, (void *)rela->r_addend,
     94 			    (void *)*where,
     95 			    obj->strtab + obj->symtab[symnum].st_name));
     96 			_rtld_error("%s: Unsupported relocation type %ld "
     97 			    "in non-PLT relocations\n",
     98 			    obj->path, (u_long) ELF_R_TYPE(rela->r_info));
     99 			return -1;
    100 		}
    101 	}
    102 	return 0;
    103 }
    104 
    105 int
    106 _rtld_relocate_plt_lazy(obj, dodebug)
    107 	const Obj_Entry *obj;
    108 	bool dodebug;
    109 {
    110 	const Elf_Rela *rela;
    111 
    112 	if (!obj->isdynamic)
    113 		return 0;
    114 
    115 	for (rela = obj->pltrela; rela < obj->pltrelalim; rela++) {
    116 		Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
    117 
    118 		assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
    119 
    120 		/* Just relocate the GOT slots pointing into the PLT */
    121 		*where += (Elf_Addr)obj->relocbase;
    122 		rdbg(dodebug, ("fixup !main in %s --> %p", obj->path,
    123 		    (void *)*where));
    124 	}
    125 
    126 	return 0;
    127 }
    128 
    129 int
    130 _rtld_relocate_plt_object(obj, rela, addrp, dodebug)
    131 	const Obj_Entry *obj;
    132 	const Elf_Rela *rela;
    133 	caddr_t *addrp;
    134 	bool dodebug;
    135 {
    136 	Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
    137 	Elf_Addr new_value;
    138 	const Elf_Sym  *def;
    139 	const Obj_Entry *defobj;
    140 
    141 	assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
    142 
    143 	def = _rtld_find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj, true);
    144 	if (def == NULL)
    145 		return -1;
    146 
    147 	new_value = (Elf_Addr)(defobj->relocbase + def->st_value);
    148 	rdbg(dodebug, ("bind now/fixup in %s --> old=%p new=%p",
    149 	    defobj->strtab + def->st_name, (void *)*where, (void *)new_value));
    150 	if (*where != new_value)
    151 		*where = new_value;
    152 
    153 	*addrp = (caddr_t)new_value;
    154 	return 0;
    155 }
    156