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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(GOT32):
     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 			if (*where != tmp)
     45 				*where = tmp;
     46 			rdbg(dodebug, ("GOT32 %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(REL32):
     52 			def = _rtld_find_symdef(symnum, obj, &defobj, false);
     53 			if (def == NULL)
     54 				return -1;
     55 
     56 			*where += (Elf_Addr)(defobj->relocbase + def->st_value +
     57 			    rela->r_addend) - (Elf_Addr)where;
     58 			rdbg(dodebug, ("PC32 %s in %s --> %p in %s",
     59 			    obj->strtab + obj->symtab[symnum].st_name,
     60 			    obj->path, (void *)*where, defobj->path));
     61 			break;
     62 #endif
     63 
     64 		case R_TYPE(DIR32):
     65 			def = _rtld_find_symdef(symnum, obj, &defobj, false);
     66 			if (def == NULL)
     67 				return -1;
     68 
     69 			*where += (Elf_Addr)(defobj->relocbase + def->st_value +
     70 			    rela->r_addend);
     71 			rdbg(dodebug, ("32 %s in %s --> %p in %s",
     72 			    obj->strtab + obj->symtab[symnum].st_name,
     73 			    obj->path, (void *)*where, defobj->path));
     74 			break;
     75 
     76 		case R_TYPE(GLOB_DAT):
     77 			def = _rtld_find_symdef(symnum, obj, &defobj, false);
     78 			if (def == NULL)
     79 				return -1;
     80 
     81 			tmp = (Elf_Addr)(defobj->relocbase + def->st_value) +
     82 			    rela->r_addend;
     83 			if (*where != tmp)
     84 				*where = tmp;
     85 			rdbg(dodebug, ("GLOB_DAT %s in %s --> %p in %s",
     86 			    obj->strtab + obj->symtab[symnum].st_name,
     87 			    obj->path, (void *)*where, defobj->path));
     88 			break;
     89 
     90 		case R_TYPE(RELATIVE):
     91 			if (rela->r_addend)
     92 				*where = (Elf_Addr)obj->relocbase + rela->r_addend;
     93 			else
     94 				*where += (Elf_Addr)obj->relocbase;
     95 			rdbg(dodebug, ("RELATIVE in %s --> %p", obj->path,
     96 			    (void *)*where));
     97 			break;
     98 
     99 		case R_TYPE(COPY):
    100 			/*
    101 			 * These are deferred until all other relocations have
    102 			 * been done.  All we do here is make sure that the
    103 			 * COPY relocation is not in a shared library.  They
    104 			 * are allowed only in executable files.
    105 			 */
    106 			if (obj->isdynamic) {
    107 				_rtld_error(
    108 			"%s: Unexpected R_COPY relocation in shared library",
    109 				    obj->path);
    110 				return -1;
    111 			}
    112 			rdbg(dodebug, ("COPY (avoid in main)"));
    113 			break;
    114 
    115 		default:
    116 			rdbg(dodebug, ("sym = %lu, type = %lu, offset = %p, "
    117 			    "addend = %p, contents = %p, symbol = %s",
    118 			    symnum, (u_long)ELF_R_TYPE(rela->r_info),
    119 			    (void *)rela->r_offset, (void *)rela->r_addend,
    120 			    (void *)*where,
    121 			    obj->strtab + obj->symtab[symnum].st_name));
    122 			_rtld_error("%s: Unsupported relocation type %ld "
    123 			    "in non-PLT relocations\n",
    124 			    obj->path, (u_long) ELF_R_TYPE(rela->r_info));
    125 			return -1;
    126 		}
    127 	}
    128 	return 0;
    129 }
    130 
    131 int
    132 _rtld_relocate_plt_lazy(obj, dodebug)
    133 	const Obj_Entry *obj;
    134 	bool dodebug;
    135 {
    136 	const Elf_Rela *rela;
    137 
    138 	if (!obj->isdynamic)
    139 		return 0;
    140 
    141 	for (rela = obj->pltrela; rela < obj->pltrelalim; rela++) {
    142 		Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
    143 
    144 		assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
    145 
    146 		/* Just relocate the GOT slots pointing into the PLT */
    147 		*where += (Elf_Addr)obj->relocbase;
    148 		rdbg(dodebug, ("fixup !main in %s --> %p", obj->path,
    149 		    (void *)*where));
    150 	}
    151 
    152 	return 0;
    153 }
    154 
    155 int
    156 _rtld_relocate_plt_object(obj, rela, addrp, dodebug)
    157 	const Obj_Entry *obj;
    158 	const Elf_Rela *rela;
    159 	caddr_t *addrp;
    160 	bool dodebug;
    161 {
    162 	Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
    163 	Elf_Addr new_value;
    164 	const Elf_Sym  *def;
    165 	const Obj_Entry *defobj;
    166 
    167 	assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
    168 
    169 	def = _rtld_find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj, true);
    170 	if (def == NULL)
    171 		return -1;
    172 
    173 	new_value = (Elf_Addr)(defobj->relocbase + def->st_value +
    174 	    rela->r_addend);
    175 	rdbg(dodebug, ("bind now/fixup in %s --> old=%p new=%p",
    176 	    defobj->strtab + def->st_name, (void *)*where, (void *)new_value));
    177 	if (*where != new_value)
    178 		*where = new_value;
    179 
    180 	*addrp = (caddr_t)new_value;
    181 	return 0;
    182 }
    183