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mdreloc.c revision 1.12 
      1 /*	$NetBSD: mdreloc.c,v 1.12 2002/09/12 22:56:31 mycroft Exp $	*/
      2 
      3 #include <sys/types.h>
      4 #include <sys/stat.h>
      5 
      6 #include "debug.h"
      7 #include "rtld.h"
      8 
      9 void _rtld_bind_start(void);
     10 
     11 void
     12 _rtld_setup_pltgot(const Obj_Entry *obj)
     13 {
     14 	obj->pltgot[1] = (Elf_Addr) obj;
     15 	obj->pltgot[2] = (Elf_Addr) &_rtld_bind_start;
     16 }
     17 
     18 int
     19 _rtld_relocate_nonplt_objects(obj, self)
     20 	const Obj_Entry *obj;
     21 	bool self;
     22 {
     23 	const Elf_Rela *rela;
     24 
     25 	for (rela = obj->rela; rela < obj->relalim; rela++) {
     26 		Elf_Addr        *where;
     27 		const Elf_Sym   *def;
     28 		const Obj_Entry *defobj;
     29 		Elf_Addr         tmp;
     30 		unsigned long	 symnum;
     31 
     32 		where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
     33 		symnum = ELF_R_SYM(rela->r_info);
     34 
     35 		switch (ELF_R_TYPE(rela->r_info)) {
     36 		case R_TYPE(NONE):
     37 			break;
     38 
     39 #if 1 /* XXX should not occur */
     40 		case R_TYPE(GOT32):
     41 			def = _rtld_find_symdef(symnum, obj, &defobj, false);
     42 			if (def == NULL)
     43 				return -1;
     44 
     45 			tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
     46 			    rela->r_addend);
     47 			if (*where != tmp)
     48 				*where = tmp;
     49 			rdbg(("GOT32 %s in %s --> %p in %s",
     50 			    obj->strtab + obj->symtab[symnum].st_name,
     51 			    obj->path, (void *)*where, defobj->path));
     52 			break;
     53 
     54 		case R_TYPE(REL32):
     55 			def = _rtld_find_symdef(symnum, obj, &defobj, false);
     56 			if (def == NULL)
     57 				return -1;
     58 
     59 			*where += (Elf_Addr)(defobj->relocbase + def->st_value +
     60 			    rela->r_addend) - (Elf_Addr)where;
     61 			rdbg(("PC32 %s in %s --> %p in %s",
     62 			    obj->strtab + obj->symtab[symnum].st_name,
     63 			    obj->path, (void *)*where, defobj->path));
     64 			break;
     65 #endif
     66 
     67 		case R_TYPE(DIR32):
     68 			def = _rtld_find_symdef(symnum, obj, &defobj, false);
     69 			if (def == NULL)
     70 				return -1;
     71 
     72 			*where += (Elf_Addr)(defobj->relocbase + def->st_value +
     73 			    rela->r_addend);
     74 			rdbg(("32 %s in %s --> %p in %s",
     75 			    obj->strtab + obj->symtab[symnum].st_name,
     76 			    obj->path, (void *)*where, defobj->path));
     77 			break;
     78 
     79 		case R_TYPE(GLOB_DAT):
     80 			def = _rtld_find_symdef(symnum, obj, &defobj, false);
     81 			if (def == NULL)
     82 				return -1;
     83 
     84 			tmp = (Elf_Addr)(defobj->relocbase + def->st_value) +
     85 			    rela->r_addend;
     86 			if (*where != tmp)
     87 				*where = tmp;
     88 			rdbg(("GLOB_DAT %s in %s --> %p in %s",
     89 			    obj->strtab + obj->symtab[symnum].st_name,
     90 			    obj->path, (void *)*where, defobj->path));
     91 			break;
     92 
     93 		case R_TYPE(RELATIVE):
     94 			if (rela->r_addend)
     95 				*where = (Elf_Addr)obj->relocbase + rela->r_addend;
     96 			else
     97 				*where += (Elf_Addr)obj->relocbase;
     98 			rdbg(("RELATIVE in %s --> %p", obj->path,
     99 			    (void *)*where));
    100 			break;
    101 
    102 		case R_TYPE(COPY):
    103 			/*
    104 			 * These are deferred until all other relocations have
    105 			 * been done.  All we do here is make sure that the
    106 			 * COPY relocation is not in a shared library.  They
    107 			 * are allowed only in executable files.
    108 			 */
    109 			if (obj->isdynamic) {
    110 				_rtld_error(
    111 			"%s: Unexpected R_COPY relocation in shared library",
    112 				    obj->path);
    113 				return -1;
    114 			}
    115 			rdbg(("COPY (avoid in main)"));
    116 			break;
    117 
    118 		default:
    119 			rdbg(("sym = %lu, type = %lu, offset = %p, "
    120 			    "addend = %p, contents = %p, symbol = %s",
    121 			    symnum, (u_long)ELF_R_TYPE(rela->r_info),
    122 			    (void *)rela->r_offset, (void *)rela->r_addend,
    123 			    (void *)*where,
    124 			    obj->strtab + obj->symtab[symnum].st_name));
    125 			_rtld_error("%s: Unsupported relocation type %ld "
    126 			    "in non-PLT relocations\n",
    127 			    obj->path, (u_long) ELF_R_TYPE(rela->r_info));
    128 			return -1;
    129 		}
    130 	}
    131 	return 0;
    132 }
    133 
    134 int
    135 _rtld_relocate_plt_lazy(obj)
    136 	const Obj_Entry *obj;
    137 {
    138 	const Elf_Rela *rela;
    139 
    140 	if (!obj->isdynamic)
    141 		return 0;
    142 
    143 	for (rela = obj->pltrela; rela < obj->pltrelalim; rela++) {
    144 		Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
    145 
    146 		assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
    147 
    148 		/* Just relocate the GOT slots pointing into the PLT */
    149 		*where += (Elf_Addr)obj->relocbase;
    150 		rdbg(("fixup !main in %s --> %p", obj->path, (void *)*where));
    151 	}
    152 
    153 	return 0;
    154 }
    155 
    156 int
    157 _rtld_relocate_plt_object(obj, rela, addrp)
    158 	const Obj_Entry *obj;
    159 	const Elf_Rela *rela;
    160 	caddr_t *addrp;
    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(("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