mdreloc.c revision 1.2
1 1.1 mycroft #include <sys/types.h> 2 1.1 mycroft #include <sys/stat.h> 3 1.1 mycroft 4 1.1 mycroft #include "debug.h" 5 1.1 mycroft #include "rtld.h" 6 1.1 mycroft 7 1.1 mycroft void 8 1.1 mycroft _rtld_setup_pltgot(const Obj_Entry *obj) 9 1.1 mycroft { 10 1.1 mycroft obj->pltgot[1] = (Elf_Addr) obj; 11 1.1 mycroft obj->pltgot[2] = (Elf_Addr) &_rtld_bind_start; 12 1.1 mycroft } 13 1.2 mycroft 14 1.2 mycroft int 15 1.2 mycroft _rtld_relocate_nonplt_object(obj, rela, dodebug) 16 1.2 mycroft Obj_Entry *obj; 17 1.2 mycroft const Elf_Rela *rela; 18 1.2 mycroft bool dodebug; 19 1.2 mycroft { 20 1.2 mycroft Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset); 21 1.2 mycroft const Elf_Sym *def; 22 1.2 mycroft const Obj_Entry *defobj; 23 1.2 mycroft Elf_Addr tmp; 24 1.2 mycroft 25 1.2 mycroft switch (ELF_R_TYPE(rela->r_info)) { 26 1.2 mycroft 27 1.2 mycroft case R_TYPE(NONE): 28 1.2 mycroft break; 29 1.2 mycroft 30 1.2 mycroft #if 1 /* XXX should not occur */ 31 1.2 mycroft case R_TYPE(PC32): 32 1.2 mycroft def = _rtld_find_symdef(rela->r_info, obj, &defobj, false); 33 1.2 mycroft if (def == NULL) 34 1.2 mycroft return -1; 35 1.2 mycroft 36 1.2 mycroft *where += (Elf_Addr)(defobj->relocbase + def->st_value) - 37 1.2 mycroft (Elf_Addr)where; 38 1.2 mycroft rdbg(dodebug, ("PC32 %s in %s --> %p in %s", 39 1.2 mycroft defobj->strtab + def->st_name, obj->path, 40 1.2 mycroft (void *)*where, defobj->path)); 41 1.2 mycroft break; 42 1.2 mycroft 43 1.2 mycroft case R_TYPE(GOT32): 44 1.2 mycroft #endif 45 1.2 mycroft case R_TYPE(32): 46 1.2 mycroft case R_TYPE(GLOB_DAT): 47 1.2 mycroft def = _rtld_find_symdef(rela->r_info, obj, &defobj, false); 48 1.2 mycroft if (def == NULL) 49 1.2 mycroft return -1; 50 1.2 mycroft 51 1.2 mycroft tmp = (Elf_Addr)(defobj->relocbase + def->st_value + 52 1.2 mycroft rela->r_addend); 53 1.2 mycroft if (*where != tmp) 54 1.2 mycroft *where = tmp; 55 1.2 mycroft rdbg(dodebug, ("32/GLOB_DAT %s in %s --> %p in %s", 56 1.2 mycroft defobj->strtab + def->st_name, obj->path, 57 1.2 mycroft (void *)*where, defobj->path)); 58 1.2 mycroft break; 59 1.2 mycroft 60 1.2 mycroft case R_TYPE(RELATIVE): 61 1.2 mycroft *where += (Elf_Addr)obj->relocbase; 62 1.2 mycroft rdbg(dodebug, ("RELATIVE in %s --> %p", obj->path, 63 1.2 mycroft (void *)*where)); 64 1.2 mycroft break; 65 1.2 mycroft 66 1.2 mycroft case R_TYPE(COPY): 67 1.2 mycroft /* 68 1.2 mycroft * These are deferred until all other relocations have 69 1.2 mycroft * been done. All we do here is make sure that the COPY 70 1.2 mycroft * relocation is not in a shared library. They are allowed 71 1.2 mycroft * only in executable files. 72 1.2 mycroft */ 73 1.2 mycroft if (!obj->mainprog) { 74 1.2 mycroft _rtld_error( 75 1.2 mycroft "%s: Unexpected R_COPY relocation in shared library", 76 1.2 mycroft obj->path); 77 1.2 mycroft return -1; 78 1.2 mycroft } 79 1.2 mycroft rdbg(dodebug, ("COPY (avoid in main)")); 80 1.2 mycroft break; 81 1.2 mycroft 82 1.2 mycroft default: 83 1.2 mycroft def = _rtld_find_symdef(rela->r_info, obj, &defobj, true); 84 1.2 mycroft rdbg(dodebug, ("sym = %lu, type = %lu, offset = %p, " 85 1.2 mycroft "addend = %p, contents = %p, symbol = %s", 86 1.2 mycroft (u_long)ELF_R_SYM(rela->r_info), 87 1.2 mycroft (u_long)ELF_R_TYPE(rela->r_info), 88 1.2 mycroft (void *)rela->r_offset, (void *)rela->r_addend, 89 1.2 mycroft (void *)*where, 90 1.2 mycroft def ? defobj->strtab + def->st_name : "??")); 91 1.2 mycroft _rtld_error("%s: Unsupported relocation type %ld " 92 1.2 mycroft "in non-PLT relocations\n", 93 1.2 mycroft obj->path, (u_long) ELF_R_TYPE(rela->r_info)); 94 1.2 mycroft return -1; 95 1.2 mycroft } 96 1.2 mycroft return 0; 97 1.2 mycroft } 98
Indexes created Sun Sep 28 16:09:52 GMT 2025