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mdreloc.c revision 1.14 
      1 /*	$NetBSD: mdreloc.c,v 1.14 2002/10/03 20:39:23 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)
     20 	const Obj_Entry *obj;
     21 {
     22 	const Elf_Rela *rela;
     23 
     24 	for (rela = obj->rela; rela < obj->relalim; rela++) {
     25 		Elf_Addr        *where;
     26 		const Elf_Sym   *def;
     27 		const Obj_Entry *defobj;
     28 		Elf_Addr         tmp;
     29 		unsigned long	 symnum;
     30 
     31 		where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
     32 		symnum = ELF_R_SYM(rela->r_info);
     33 
     34 		switch (ELF_R_TYPE(rela->r_info)) {
     35 		case R_TYPE(NONE):
     36 			break;
     37 
     38 #if 1 /* XXX should not occur */
     39 		case R_TYPE(GOT32):
     40 			def = _rtld_find_symdef(symnum, obj, &defobj, false);
     41 			if (def == NULL)
     42 				return -1;
     43 
     44 			tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
     45 			    rela->r_addend);
     46 			if (*where != tmp)
     47 				*where = tmp;
     48 			rdbg(("GOT32 %s in %s --> %p in %s",
     49 			    obj->strtab + obj->symtab[symnum].st_name,
     50 			    obj->path, (void *)*where, defobj->path));
     51 			break;
     52 
     53 		case R_TYPE(REL32):
     54 			def = _rtld_find_symdef(symnum, obj, &defobj, false);
     55 			if (def == NULL)
     56 				return -1;
     57 
     58 			*where += (Elf_Addr)(defobj->relocbase + def->st_value +
     59 			    rela->r_addend) - (Elf_Addr)where;
     60 			rdbg(("PC32 %s in %s --> %p in %s",
     61 			    obj->strtab + obj->symtab[symnum].st_name,
     62 			    obj->path, (void *)*where, defobj->path));
     63 			break;
     64 #endif
     65 
     66 		case R_TYPE(DIR32):
     67 			def = _rtld_find_symdef(symnum, obj, &defobj, false);
     68 			if (def == NULL)
     69 				return -1;
     70 
     71 			*where += (Elf_Addr)(defobj->relocbase + def->st_value +
     72 			    rela->r_addend);
     73 			rdbg(("32 %s in %s --> %p in %s",
     74 			    obj->strtab + obj->symtab[symnum].st_name,
     75 			    obj->path, (void *)*where, defobj->path));
     76 			break;
     77 
     78 		case R_TYPE(GLOB_DAT):
     79 			def = _rtld_find_symdef(symnum, obj, &defobj, false);
     80 			if (def == NULL)
     81 				return -1;
     82 
     83 			tmp = (Elf_Addr)(defobj->relocbase + def->st_value) +
     84 			    rela->r_addend;
     85 			if (*where != tmp)
     86 				*where = tmp;
     87 			rdbg(("GLOB_DAT %s in %s --> %p in %s",
     88 			    obj->strtab + obj->symtab[symnum].st_name,
     89 			    obj->path, (void *)*where, defobj->path));
     90 			break;
     91 
     92 		case R_TYPE(RELATIVE):
     93 			if (rela->r_addend)
     94 				*where = (Elf_Addr)obj->relocbase + rela->r_addend;
     95 			else
     96 				*where += (Elf_Addr)obj->relocbase;
     97 			rdbg(("RELATIVE in %s --> %p", obj->path,
     98 			    (void *)*where));
     99 			break;
    100 
    101 		case R_TYPE(COPY):
    102 			/*
    103 			 * These are deferred until all other relocations have
    104 			 * been done.  All we do here is make sure that the
    105 			 * COPY relocation is not in a shared library.  They
    106 			 * are allowed only in executable files.
    107 			 */
    108 			if (obj->isdynamic) {
    109 				_rtld_error(
    110 			"%s: Unexpected R_COPY relocation in shared library",
    111 				    obj->path);
    112 				return -1;
    113 			}
    114 			rdbg(("COPY (avoid in main)"));
    115 			break;
    116 
    117 		default:
    118 			rdbg(("sym = %lu, type = %lu, offset = %p, "
    119 			    "addend = %p, contents = %p, symbol = %s",
    120 			    symnum, (u_long)ELF_R_TYPE(rela->r_info),
    121 			    (void *)rela->r_offset, (void *)rela->r_addend,
    122 			    (void *)*where,
    123 			    obj->strtab + obj->symtab[symnum].st_name));
    124 			_rtld_error("%s: Unsupported relocation type %ld "
    125 			    "in non-PLT relocations\n",
    126 			    obj->path, (u_long) ELF_R_TYPE(rela->r_info));
    127 			return -1;
    128 		}
    129 	}
    130 	return 0;
    131 }
    132 
    133 int
    134 _rtld_relocate_plt_lazy(obj)
    135 	const Obj_Entry *obj;
    136 {
    137 	const Elf_Rela *rela;
    138 
    139 	if (!obj->relocbase)
    140 		return 0;
    141 
    142 	for (rela = obj->pltrela; rela < obj->pltrelalim; rela++) {
    143 		Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
    144 
    145 		assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
    146 
    147 		/* Just relocate the GOT slots pointing into the PLT */
    148 		*where += (Elf_Addr)obj->relocbase;
    149 		rdbg(("fixup !main in %s --> %p", obj->path, (void *)*where));
    150 	}
    151 
    152 	return 0;
    153 }
    154 
    155 int
    156 _rtld_relocate_plt_object(obj, rela, addrp)
    157 	const Obj_Entry *obj;
    158 	const Elf_Rela *rela;
    159 	caddr_t *addrp;
    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(("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