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mdreloc.c revision 1.7 
      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(GOT32):
     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);
     43 			if (*where != tmp)
     44 				*where = tmp;
     45 			rdbg(dodebug, ("GOT32 %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(REL32):
     51 			def = _rtld_find_symdef(symnum, obj, &defobj, false);
     52 			if (def == NULL)
     53 				return -1;
     54 
     55 			*where += (Elf_Addr)(defobj->relocbase + def->st_value +
     56 			    rela->r_addend) - (Elf_Addr)where;
     57 			rdbg(dodebug, ("PC32 %s in %s --> %p in %s",
     58 			    obj->strtab + obj->symtab[symnum].st_name,
     59 			    obj->path, (void *)*where, defobj->path));
     60 			break;
     61 #endif
     62 
     63 		case R_TYPE(DIR32):
     64 			def = _rtld_find_symdef(symnum, obj, &defobj, false);
     65 			if (def == NULL)
     66 				return -1;
     67 
     68 			*where += (Elf_Addr)(defobj->relocbase + def->st_value +
     69 			    rela->r_addend);
     70 			rdbg(dodebug, ("32 %s in %s --> %p in %s",
     71 			    obj->strtab + obj->symtab[symnum].st_name,
     72 			    obj->path, (void *)*where, defobj->path));
     73 			break;
     74 
     75 		case R_TYPE(GLOB_DAT):
     76 			def = _rtld_find_symdef(symnum, obj, &defobj, false);
     77 			if (def == NULL)
     78 				return -1;
     79 
     80 			tmp = (Elf_Addr)(defobj->relocbase + def->st_value) +
     81 			    rela->r_addend;
     82 			if (*where != tmp)
     83 				*where = tmp;
     84 			rdbg(dodebug, ("GLOB_DAT %s in %s --> %p in %s",
     85 			    obj->strtab + obj->symtab[symnum].st_name,
     86 			    obj->path, (void *)*where, defobj->path));
     87 			break;
     88 
     89 		case R_TYPE(RELATIVE):
     90 			if (rela->r_addend)
     91 				*where = (Elf_Addr)obj->relocbase + rela->r_addend;
     92 			else
     93 				*where += (Elf_Addr)obj->relocbase;
     94 			rdbg(dodebug, ("RELATIVE in %s --> %p", obj->path,
     95 			    (void *)*where));
     96 			break;
     97 
     98 		case R_TYPE(COPY):
     99 			/*
    100 			 * These are deferred until all other relocations have
    101 			 * been done.  All we do here is make sure that the
    102 			 * COPY relocation is not in a shared library.  They
    103 			 * are allowed only in executable files.
    104 			 */
    105 			if (!obj->mainprog) {
    106 				_rtld_error(
    107 			"%s: Unexpected R_COPY relocation in shared library",
    108 				    obj->path);
    109 				return -1;
    110 			}
    111 			rdbg(dodebug, ("COPY (avoid in main)"));
    112 			break;
    113 
    114 		default:
    115 			rdbg(dodebug, ("sym = %lu, type = %lu, offset = %p, "
    116 			    "addend = %p, contents = %p, symbol = %s",
    117 			    symnum, (u_long)ELF_R_TYPE(rela->r_info),
    118 			    (void *)rela->r_offset, (void *)rela->r_addend,
    119 			    (void *)*where,
    120 			    obj->strtab + obj->symtab[symnum].st_name));
    121 			_rtld_error("%s: Unsupported relocation type %ld "
    122 			    "in non-PLT relocations\n",
    123 			    obj->path, (u_long) ELF_R_TYPE(rela->r_info));
    124 			return -1;
    125 		}
    126 	}
    127 	return 0;
    128 }
    129 
    130 int
    131 _rtld_relocate_plt_lazy(obj, dodebug)
    132 	const Obj_Entry *obj;
    133 	bool dodebug;
    134 {
    135 	const Elf_Rela *rela;
    136 
    137 	if (obj->mainprog)
    138 		return 0;
    139 
    140 	for (rela = obj->pltrela; rela < obj->pltrelalim; rela++) {
    141 		Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
    142 
    143 		assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
    144 
    145 		/* Just relocate the GOT slots pointing into the PLT */
    146 		*where += (Elf_Addr)obj->relocbase;
    147 		rdbg(dodebug, ("fixup !main in %s --> %p", obj->path,
    148 		    (void *)*where));
    149 	}
    150 
    151 	return 0;
    152 }
    153 
    154 int
    155 _rtld_relocate_plt_object(obj, rela, addrp, dodebug)
    156 	const Obj_Entry *obj;
    157 	const Elf_Rela *rela;
    158 	caddr_t *addrp;
    159 	bool dodebug;
    160 {
    161 	Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
    162 	Elf_Addr new_value;
    163 	const Elf_Sym  *def;
    164 	const Obj_Entry *defobj;
    165 
    166 	assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
    167 
    168 	def = _rtld_find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj, true);
    169 	if (def == NULL)
    170 		return -1;
    171 
    172 	new_value = (Elf_Addr)(defobj->relocbase + def->st_value +
    173 	    rela->r_addend);
    174 	rdbg(dodebug, ("bind now/fixup in %s --> old=%p new=%p",
    175 	    defobj->strtab + def->st_name, (void *)*where, (void *)new_value));
    176 	if (*where != new_value)
    177 		*where = new_value;
    178 
    179 	*addrp = (caddr_t)new_value;
    180 	return 0;
    181 }
    182