Home | History | Annotate | Line # | Download | only in arm
mdreloc.c revision 1.2 
      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_object(obj, rela, dodebug)
     16 	Obj_Entry *obj;
     17 	const Elf_Rela *rela;
     18 	bool dodebug;
     19 {
     20 	Elf_Addr        *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
     21 	const Elf_Sym   *def;
     22 	const Obj_Entry *defobj;
     23 	Elf_Addr         tmp;
     24 
     25 	switch (ELF_R_TYPE(rela->r_info)) {
     26 
     27 	case R_TYPE(NONE):
     28 		break;
     29 
     30 #if 1 /* XXX should not occur */
     31 	case R_TYPE(PC24): {	/* word32 S - P + A */
     32 		Elf32_Sword addend;
     33 
     34 		/*
     35 		 * Extract addend and sign-extend if needed.
     36 		 */
     37 		addend = *where;
     38 		if (addend & 0x00800000)
     39 			addend |= 0xff000000;
     40 
     41 		def = _rtld_find_symdef(rela->r_info, obj, &defobj, false);
     42 		if (def == NULL)
     43 			return -1;
     44 		tmp = (Elf_Addr)obj->relocbase + def->st_value
     45 		    - (Elf_Addr)where + (addend << 2);
     46 		if ((tmp & 0xfe000000) != 0xfe000000 &&
     47 		    (tmp & 0xfe000000) != 0) {
     48 			_rtld_error(
     49 			"%s: R_ARM_PC24 relocation @ %p to %s failed "
     50 			"(displacement %ld (%#lx) out of range)",
     51 			    obj->path, where, defobj->strtab + def->st_name,
     52 			    (long) tmp, (long) tmp);
     53 			return -1;
     54 		}
     55 		tmp >>= 2;
     56 		*where = (*where & 0xff000000) | (tmp & 0x00ffffff);
     57 		rdbg(dodebug, ("PC24 %s in %s --> %p @ %p in %s",
     58 		    defobj->strtab + def->st_name, obj->path,
     59 		    (void *)*where, where, defobj->path));
     60 		break;
     61 	}
     62 #endif
     63 
     64 	case R_TYPE(ABS32):	/* word32 B + S + A */
     65 		def = _rtld_find_symdef(rela->r_info, obj, &defobj, false);
     66 		if (def == NULL)
     67 			return -1;
     68 		*where += (Elf_Addr)defobj->relocbase + def->st_value;
     69 		rdbg(dodebug, ("ABS32 %s in %s --> %p @ %p in %s",
     70 		    defobj->strtab + def->st_name, obj->path,
     71 		    (void *)*where, where, defobj->path));
     72 		break;
     73 
     74 	case R_TYPE(GLOB_DAT):	/* word32 B + S */
     75 		def = _rtld_find_symdef(rela->r_info, obj, &defobj, false);
     76 		if (def == NULL)
     77 			return -1;
     78 		*where = (Elf_Addr)(defobj->relocbase + def->st_value);
     79 		rdbg(dodebug, ("GLOB_DAT %s in %s --> %p @ %p in %s",
     80 		    defobj->strtab + def->st_name, obj->path,
     81 		    (void *)*where, where, defobj->path));
     82 		break;
     83 
     84 	case R_TYPE(RELATIVE):	/* word32 B + A */
     85 		*where += (Elf_Addr)obj->relocbase;
     86 		rdbg(dodebug, ("RELATIVE in %s --> %p @ %p", obj->path,
     87 		    (void *)*where, where));
     88 		break;
     89 
     90 	case R_TYPE(COPY):
     91 		/*
     92 		 * These are deferred until all other relocations have
     93 		 * been done.  All we do here is make sure that the COPY
     94 		 * relocation is not in a shared library.  They are allowed
     95 		 * only in executable files.
     96 		 */
     97 		if (!obj->mainprog) {
     98 			_rtld_error(
     99 			"%s: Unexpected R_COPY relocation in shared library",
    100 			    obj->path);
    101 			return -1;
    102 		}
    103 		rdbg(dodebug, ("COPY (avoid in main)"));
    104 		break;
    105 
    106 	default:
    107 		def = _rtld_find_symdef(rela->r_info, obj, &defobj, true);
    108 		rdbg(dodebug, ("sym = %lu, type = %lu, offset = %p, "
    109 		    "addend = %p, contents = %p, symbol = %s",
    110 		    (u_long)ELF_R_SYM(rela->r_info),
    111 		    (u_long)ELF_R_TYPE(rela->r_info),
    112 		    (void *)rela->r_offset, (void *)rela->r_addend,
    113 		    (void *)*where,
    114 		    def ? defobj->strtab + def->st_name : "??"));
    115 		_rtld_error("%s: Unsupported relocation type %ld "
    116 		    "in non-PLT relocations\n",
    117 		    obj->path, (u_long) ELF_R_TYPE(rela->r_info));
    118 		return -1;
    119 	}
    120 	return 0;
    121 }
    122