1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright (c) 1988 AT&T 24 * All Rights Reserved 25 * 26 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29 30 #ifndef _LIBLD_H 31 #define _LIBLD_H 32 33 #include <stdlib.h> 34 #include <libelf.h> 35 #include <sgs.h> 36 #include <_machelf.h> 37 #include <string_table.h> 38 #include <sys/avl.h> 39 #include <alist.h> 40 41 #ifdef __cplusplus 42 extern "C" { 43 #endif 44 45 /* 46 * Default directory search path manipulation for the link-editor. YLDIR 47 * indicates which directory in LIBPATH is replaced by the -YL option to cc 48 * and ld. YUDIR indicates which directory is replaced by -YU. 49 */ 50 #define YLDIR 1 51 #define YUDIR 2 52 53 /* 54 * Define a hash value that can never be returned from elf_hash(). 55 */ 56 #define SYM_NOHASH (~(Word)0) 57 58 /* 59 * Macro that can be used to represent both ORDER flags 60 * in a section header. 61 */ 62 #define ALL_SHF_ORDER (SHF_ORDERED | SHF_LINK_ORDER) 63 64 /* 65 * The linker merges (concatenates) sections with the same name and 66 * compatible section header flags. When comparing these flags, 67 * there are some that should not be included in the decision. 68 * The ALL_SHF_IGNORE constant defines these flags. 69 * 70 * NOTE: SHF_MERGE|SHF_STRINGS: 71 * The compiler is allowed to set the SHF_MERGE|SHF_STRINGS flags in 72 * order to tell the linker that: 73 * 74 * 1) There is nothing in the section except null terminated strings. 75 * 2) Those strings do not contain NULL bytes, except as termination. 76 * 3) All references to these strings occur via standard relocation 77 * records. 78 * 79 * As a result, if two compatible sections both have these flags set, it is 80 * OK to combine the strings they contain into a single merged string table 81 * with duplicates removed and tail strings merged. 82 * 83 * This is a different meaning than the simple concatenating of sections 84 * that the linker always does. It is a hint that an additional optimization 85 * is possible, but not required. This means that sections that do not 86 * share the same SHF_MERGE|SHF_STRINGS values can be concatenated, 87 * but cannot have their duplicate strings combined. Hence, the 88 * SHF_MERGE|SHF_STRINGS flags should be ignored when deciding whether 89 * two sections can be concatenated. 90 */ 91 #define ALL_SHF_IGNORE (ALL_SHF_ORDER | SHF_GROUP | SHF_MERGE | SHF_STRINGS) 92 93 /* 94 * Define symbol reference types for use in symbol resolution. 95 */ 96 typedef enum { 97 REF_DYN_SEEN, /* a .so symbol has been seen */ 98 REF_DYN_NEED, /* a .so symbol satisfies a .o symbol */ 99 REF_REL_NEED, /* a .o symbol */ 100 REF_NUM /* the number of symbol references */ 101 } Symref; 102 103 /* 104 * GOT reference models 105 */ 106 typedef enum { 107 GOT_REF_GENERIC, /* generic symbol reference */ 108 GOT_REF_TLSIE, /* TLS initial exec (gnu) reference */ 109 GOT_REF_TLSLD, /* TLS local dynamic reference */ 110 GOT_REF_TLSGD /* TLS general dynamic reference */ 111 } Gotref; 112 113 typedef struct { 114 Xword gn_addend; /* addend associated with GOT entry */ 115 Sword gn_gotndx; /* GOT table index */ 116 Gotref gn_gotref; 117 } Gotndx; 118 119 /* 120 * Got debugging structure. The got index is defined as a signed value as we 121 * do so much mucking around with negative and positive gots on SPARC, and sign 122 * extension is necessary when building 64-bit objects. On intel we explicitly 123 * cast this variable to an unsigned value. 124 */ 125 typedef struct { 126 Sym_desc *gt_sym; 127 Gotndx gt_gndx; 128 } Gottable; 129 130 /* 131 * The link-editor caches the results of sloppy relocation processing 132 * in a variable of type Rlxrel_cache. Symbols come for processing in sorted 133 * order, so a single item cache suffices to eliminate duplicate lookups. 134 * 135 * When sloppy relocation processing fails, the Rlxrel_rej enum reports 136 * the underlying reason. 137 */ 138 typedef enum { 139 RLXREL_REJ_NONE = 0, /* Replacement symbol was found */ 140 RLXREL_REJ_TARGET, /* Target sec disallows relaxed relocations */ 141 RLXREL_REJ_SECTION, /* Either there is no replacement section, */ 142 /* or its attributes are incompatible */ 143 RLXREL_REJ_SYMBOL, /* Replacement symbol not found */ 144 } Rlxrel_rej; 145 146 typedef struct sreloc_cache { 147 Sym_desc *sr_osdp; /* Original symbol */ 148 Sym_desc *sr_rsdp; /* Replacement symbol */ 149 Rlxrel_rej sr_rej; /* Reason for failure if NULL sr_rsdp */ 150 } Rlxrel_cache; 151 152 /* 153 * Output file processing structure 154 */ 155 typedef Lword ofl_flag_t; 156 struct ofl_desc { 157 char *ofl_sgsid; /* link-editor identification */ 158 const char *ofl_name; /* full file name */ 159 Elf *ofl_elf; /* elf_memory() elf descriptor */ 160 Elf *ofl_welf; /* ELF_C_WRITE elf descriptor */ 161 Ehdr *ofl_dehdr; /* default elf header, and new elf */ 162 Ehdr *ofl_nehdr; /* header describing this file */ 163 Phdr *ofl_phdr; /* program header descriptor */ 164 Phdr *ofl_tlsphdr; /* TLS phdr */ 165 int ofl_fd; /* file descriptor */ 166 size_t ofl_size; /* image size */ 167 APlist *ofl_maps; /* list of input mapfiles */ 168 APlist *ofl_segs; /* list of segments */ 169 Alist *ofl_ents; /* list of entrance descriptors */ 170 APlist *ofl_objs; /* relocatable object file list */ 171 Word ofl_objscnt; /* and count */ 172 APlist *ofl_ars; /* archive library list */ 173 Word ofl_arscnt; /* and count */ 174 int ofl_ars_gsandx; /* archive group argv index. 0 means */ 175 /* no current group, < 0 means */ 176 /* error reported. >0 is cur ndx */ 177 Word ofl_ars_gsndx; /* current -zrescan-start ofl_ars ndx */ 178 APlist *ofl_sos; /* shared object list */ 179 Word ofl_soscnt; /* and count */ 180 APlist *ofl_soneed; /* list of implicitly required .so's */ 181 APlist *ofl_socntl; /* list of .so control definitions */ 182 APlist *ofl_outrels; /* list of output relocations */ 183 Word ofl_outrelscnt; /* and count */ 184 APlist *ofl_actrels; /* list of relocations to perform */ 185 Word ofl_actrelscnt; /* and count */ 186 Word ofl_entrelscnt; /* no of relocations entered */ 187 Alist *ofl_copyrels; /* list of copy relocations */ 188 APlist *ofl_ordered; /* list of shf_ordered sections */ 189 APlist *ofl_syminfsyms; /* list of interesting syms */ 190 /* for syminfo processing */ 191 APlist *ofl_ismove; /* list of .SUNW_move sections */ 192 APlist *ofl_ismoverel; /* list of relocation input section */ 193 /* targeting to expanded area */ 194 APlist *ofl_parsyms; /* list of partially initialized */ 195 /* symbols (ie. move symbols) */ 196 APlist *ofl_extrarels; /* relocation sections which have */ 197 /* a NULL sh_info */ 198 avl_tree_t *ofl_groups; /* pointer to head of Groups AVL tree */ 199 APlist *ofl_initarray; /* list of init array func names */ 200 APlist *ofl_finiarray; /* list of fini array func names */ 201 APlist *ofl_preiarray; /* list of preinit array func names */ 202 APlist *ofl_rtldinfo; /* list of rtldinfo syms */ 203 APlist *ofl_osgroups; /* list of output GROUP sections */ 204 APlist *ofl_ostlsseg; /* pointer to sections in TLS segment */ 205 APlist *ofl_unwind; /* list of unwind output sections */ 206 Os_desc *ofl_unwindhdr; /* Unwind hdr */ 207 avl_tree_t ofl_symavl; /* pointer to head of Syms AVL tree */ 208 Sym_desc **ofl_regsyms; /* array of potential register */ 209 Word ofl_regsymsno; /* symbols and array count */ 210 Word ofl_regsymcnt; /* no. of output register symbols */ 211 Word ofl_lregsymcnt; /* no. of local register symbols */ 212 Sym_desc *ofl_dtracesym; /* ld -zdtrace= */ 213 ofl_flag_t ofl_flags; /* various state bits, args etc. */ 214 ofl_flag_t ofl_flags1; /* more flags */ 215 void *ofl_entry; /* entry point (-e and Sym_desc *) */ 216 char *ofl_filtees; /* shared objects we are a filter for */ 217 const char *ofl_soname; /* (-h option) output file name for */ 218 /* dynamic structure */ 219 const char *ofl_interp; /* interpreter name used by exec() */ 220 char *ofl_rpath; /* run path to store in .dynamic */ 221 char *ofl_config; /* config path to store in .dynamic */ 222 APlist *ofl_ulibdirs; /* user supplied library search list */ 223 APlist *ofl_dlibdirs; /* default library search list */ 224 Word ofl_vercnt; /* number of versions to generate */ 225 APlist *ofl_verdesc; /* list of version descriptors */ 226 size_t ofl_verdefsz; /* size of version definition section */ 227 size_t ofl_verneedsz; /* size of version needed section */ 228 Word ofl_entercnt; /* no. of global symbols entered */ 229 Word ofl_globcnt; /* no. of global symbols to output */ 230 Word ofl_scopecnt; /* no. of scoped symbols to output */ 231 Word ofl_dynscopecnt; /* no. scoped syms in .SUNW_ldynsym */ 232 Word ofl_elimcnt; /* no. of eliminated symbols */ 233 Word ofl_locscnt; /* no. of local symbols in .symtab */ 234 Word ofl_dynlocscnt; /* no. local symbols in .SUNW_ldynsym */ 235 Word ofl_dynsymsortcnt; /* no. ndx in .SUNW_dynsymsort */ 236 Word ofl_dyntlssortcnt; /* no. ndx in .SUNW_dyntlssort */ 237 Word ofl_dynshdrcnt; /* no. of output section in .dynsym */ 238 Word ofl_shdrcnt; /* no. of output sections */ 239 Str_tbl *ofl_shdrsttab; /* Str_tbl for shdr strtab */ 240 Str_tbl *ofl_strtab; /* Str_tbl for symtab strtab */ 241 Str_tbl *ofl_dynstrtab; /* Str_tbl for dymsym strtab */ 242 Gotndx *ofl_tlsldgotndx; /* index to LD TLS_index structure */ 243 Xword ofl_relocsz; /* size of output relocations */ 244 Xword ofl_relocgotsz; /* size of .got relocations */ 245 Xword ofl_relocpltsz; /* size of .plt relocations */ 246 Xword ofl_relocbsssz; /* size of .bss (copy) relocations */ 247 Xword ofl_relocrelsz; /* size of .rel[a] relocations */ 248 Word ofl_relocincnt; /* no. of input relocations */ 249 Word ofl_reloccnt; /* tot number of output relocations */ 250 Word ofl_reloccntsub; /* tot numb of output relocations to */ 251 /* skip (-zignore) */ 252 Word ofl_relocrelcnt; /* tot number of relative */ 253 /* relocations */ 254 Word ofl_gotcnt; /* no. of .got entries */ 255 Word ofl_pltcnt; /* no. of .plt entries */ 256 Word ofl_pltpad; /* no. of .plt padd entries */ 257 Word ofl_hashbkts; /* no. of hash buckets required */ 258 Is_desc *ofl_isbss; /* .bss input section (globals) */ 259 Is_desc *ofl_islbss; /* .lbss input section (globals) */ 260 Is_desc *ofl_istlsbss; /* .tlsbss input section (globals) */ 261 Is_desc *ofl_isparexpn; /* -z nopartial .data input section */ 262 Os_desc *ofl_osdynamic; /* .dynamic output section */ 263 Os_desc *ofl_osdynsym; /* .dynsym output section */ 264 Os_desc *ofl_osldynsym; /* .SUNW_ldynsym output section */ 265 Os_desc *ofl_osdynstr; /* .dynstr output section */ 266 Os_desc *ofl_osdynsymsort; /* .SUNW_dynsymsort output section */ 267 Os_desc *ofl_osdyntlssort; /* .SUNW_dyntlssort output section */ 268 Os_desc *ofl_osgot; /* .got output section */ 269 Os_desc *ofl_oshash; /* .hash output section */ 270 Os_desc *ofl_osinitarray; /* .initarray output section */ 271 Os_desc *ofl_osfiniarray; /* .finiarray output section */ 272 Os_desc *ofl_ospreinitarray; /* .preinitarray output section */ 273 Os_desc *ofl_osinterp; /* .interp output section */ 274 Os_desc *ofl_oscap; /* .SUNW_cap output section */ 275 Os_desc *ofl_osplt; /* .plt output section */ 276 Os_desc *ofl_osmove; /* .SUNW_move output section */ 277 Os_desc *ofl_osrelhead; /* first relocation section */ 278 Os_desc *ofl_osrel; /* .rel[a] relocation section */ 279 Os_desc *ofl_osshstrtab; /* .shstrtab output section */ 280 Os_desc *ofl_osstrtab; /* .strtab output section */ 281 Os_desc *ofl_ossymtab; /* .symtab output section */ 282 Os_desc *ofl_ossymshndx; /* .symtab_shndx output section */ 283 Os_desc *ofl_osdynshndx; /* .dynsym_shndx output section */ 284 Os_desc *ofl_osldynshndx; /* .SUNW_ldynsym_shndx output sec */ 285 Os_desc *ofl_osverdef; /* .version definition output section */ 286 Os_desc *ofl_osverneed; /* .version needed output section */ 287 Os_desc *ofl_osversym; /* .version symbol ndx output section */ 288 Word ofl_dtflags_1; /* DT_FLAGS_1 entries */ 289 Word ofl_dtflags; /* DT_FLAGS entries */ 290 Os_desc *ofl_ossyminfo; /* .SUNW_syminfo output section */ 291 Half ofl_parexpnndx; /* -z nopartial section index */ 292 /* Ref. at perform_outreloc() in */ 293 /* libld/{mach}/machrel.c */ 294 Xword *ofl_checksum; /* DT_CHECKSUM value address */ 295 char *ofl_depaudit; /* dependency auditing required (-P) */ 296 char *ofl_audit; /* object auditing required (-p) */ 297 Alist *ofl_symfltrs; /* per-symbol filtees and their */ 298 Alist *ofl_dtsfltrs; /* associated .dynamic/.dynstrs */ 299 Xword ofl_hwcap_1; /* hardware capabilities */ 300 Xword ofl_sfcap_1; /* software capabilities */ 301 Lm_list *ofl_lml; /* runtime link-map list */ 302 Gottable *ofl_gottable; /* debugging got information */ 303 Rlxrel_cache ofl_sr_cache; /* Cache last result from */ 304 /* sloppy_comdat_reloc() */ 305 APlist *ofl_maptext; /* mapfile added text sections */ 306 APlist *ofl_mapdata; /* mapfile added data sections */ 307 }; 308 309 #define FLG_OF_DYNAMIC 0x00000001 /* generate dynamic output module */ 310 #define FLG_OF_STATIC 0x00000002 /* generate static output module */ 311 #define FLG_OF_EXEC 0x00000004 /* generate an executable */ 312 #define FLG_OF_RELOBJ 0x00000008 /* generate a relocatable object */ 313 #define FLG_OF_SHAROBJ 0x00000010 /* generate a shared object */ 314 #define FLG_OF_BFLAG 0x00000020 /* do no special plt building: -b */ 315 #define FLG_OF_IGNENV 0x00000040 /* ignore LD_LIBRARY_PATH: -i */ 316 #define FLG_OF_STRIP 0x00000080 /* strip output: -s */ 317 #define FLG_OF_NOWARN 0x00000100 /* disable symbol warnings: -t */ 318 #define FLG_OF_NOUNDEF 0x00000200 /* allow no undefined symbols: -zdefs */ 319 #define FLG_OF_PURETXT 0x00000400 /* allow no text relocations: -ztext */ 320 #define FLG_OF_GENMAP 0x00000800 /* generate a memory map: -m */ 321 #define FLG_OF_DYNLIBS 0x00001000 /* dynamic input allowed: -Bdynamic */ 322 #define FLG_OF_SYMBOLIC 0x00002000 /* bind global symbols: -Bsymbolic */ 323 #define FLG_OF_ADDVERS 0x00004000 /* add version stamp: -Qy */ 324 #define FLG_OF_NOLDYNSYM 0x00008000 /* -znoldynsym set */ 325 #define FLG_OF_SEGORDER 0x00010000 /* segment ordering is required */ 326 #define FLG_OF_SEGSORT 0x00020000 /* segment sorting is required */ 327 #define FLG_OF_TEXTREL 0x00040000 /* text relocations have been found */ 328 #define FLG_OF_MULDEFS 0x00080000 /* multiple symbols are allowed */ 329 #define FLG_OF_TLSPHDR 0x00100000 /* a TLS program header is required */ 330 #define FLG_OF_BLDGOT 0x00200000 /* build GOT table */ 331 #define FLG_OF_VERDEF 0x00400000 /* record version definitions */ 332 #define FLG_OF_VERNEED 0x00800000 /* record version dependencies */ 333 #define FLG_OF_NOVERSEC 0x01000000 /* don't record version sections */ 334 #define FLG_OF_KEY 0x02000000 /* file requires sort keys */ 335 #define FLG_OF_PROCRED 0x04000000 /* process any symbol reductions by */ 336 /* effecting the symbol table */ 337 /* output and relocations */ 338 #define FLG_OF_SYMINFO 0x08000000 /* create a syminfo section */ 339 #define FLG_OF_AUX 0x10000000 /* ofl_filter is an auxiliary filter */ 340 #define FLG_OF_FATAL 0x20000000 /* fatal error during input */ 341 #define FLG_OF_WARN 0x40000000 /* warning during input processing. */ 342 #define FLG_OF_VERBOSE 0x80000000 /* -z verbose flag set */ 343 344 #define FLG_OF_MAPSYMB 0x000100000000 /* symbolic scope definition seen */ 345 #define FLG_OF_MAPGLOB 0x000200000000 /* global scope definition seen */ 346 #define FLG_OF_COMREL 0x000400000000 /* -z combreloc set, which enables */ 347 /* DT_RELACNT tracking, */ 348 #define FLG_OF_NOCOMREL 0x000800000000 /* -z nocombreloc set */ 349 #define FLG_OF_AUTOLCL 0x001000000000 /* automatically reduce unspecified */ 350 /* global symbols to locals */ 351 #define FLG_OF_AUTOELM 0x002000000000 /* automatically eliminate */ 352 /* unspecified global symbols */ 353 #define FLG_OF_REDLSYM 0x004000000000 /* reduce local symbols */ 354 #define FLG_OF_SECORDER 0x008000000000 /* section ordering is required */ 355 #define FLG_OF_OSABI 0x010000000000 /* Tag object as ELFOSABI_SOLARIS */ 356 357 /* 358 * In the flags1 arena, establish any options that are applicable to archive 359 * extraction first, and associate a mask. These values are recorded with any 360 * archive descriptor so that they may be reset should the archive require a 361 * rescan to try and resolve undefined symbols. 362 */ 363 #define FLG_OF1_ALLEXRT 0x00000001 /* extract all members from an */ 364 /* archive file */ 365 #define FLG_OF1_WEAKEXT 0x00000002 /* allow archive extraction to */ 366 /* resolve weak references */ 367 #define MSK_OF1_ARCHIVE 0x00000003 /* archive flags mask */ 368 369 #define FLG_OF1_NOINTRP 0x00000008 /* -z nointerp flag set */ 370 #define FLG_OF1_ZDIRECT 0x00000010 /* -z direct flag set */ 371 #define FLG_OF1_NDIRECT 0x00000020 /* no-direct bindings specified */ 372 #define FLG_OF1_OVHWCAP 0x00000040 /* override any input hardware or */ 373 #define FLG_OF1_OVSFCAP 0x00000080 /* software capabilities */ 374 #define FLG_OF1_RELDYN 0x00000100 /* process .dynamic in rel obj */ 375 #define FLG_OF1_NRLXREL 0x00000200 /* -z norelaxreloc flag set */ 376 #define FLG_OF1_RLXREL 0x00000400 /* -z relaxreloc flag set */ 377 #define FLG_OF1_IGNORE 0x00000800 /* ignore unused dependencies */ 378 379 #define FLG_OF1_TEXTOFF 0x00002000 /* text relocations are ok */ 380 #define FLG_OF1_ABSEXEC 0x00004000 /* -zabsexec set */ 381 #define FLG_OF1_LAZYLD 0x00008000 /* lazy loading of objects enabled */ 382 #define FLG_OF1_GRPPRM 0x00010000 /* dependencies are to have */ 383 /* GROUPPERM enabled */ 384 #define FLG_OF1_OVRFLW 0x00020000 /* size exceeds 32-bit limitation */ 385 /* of 32-bit libld */ 386 #define FLG_OF1_NOPARTI 0x00040000 /* -znopartial set */ 387 #define FLG_OF1_BSSOREL 0x00080000 /* output relocation against bss */ 388 /* section */ 389 #define FLG_OF1_TLSOREL 0x00100000 /* output relocation against .tlsbss */ 390 /* section */ 391 #define FLG_OF1_MEMORY 0x00200000 /* produce a memory model */ 392 393 #define FLG_OF1_ENCDIFF 0x00800000 /* Host running linker has different */ 394 /* byte order than output object */ 395 #define FLG_OF1_VADDR 0x01000000 /* user segment defines a vaddr */ 396 #define FLG_OF1_EXTRACT 0x02000000 /* archive member has been extracted */ 397 #define FLG_OF1_RESCAN 0x04000000 /* any archives should be rescanned */ 398 #define FLG_OF1_IGNPRC 0x08000000 /* ignore processing required */ 399 #define FLG_OF1_NCSTTAB 0x10000000 /* -znocompstrtab set */ 400 #define FLG_OF1_DONE 0x20000000 /* link-editor processing complete */ 401 #define FLG_OF1_NONREG 0x40000000 /* non-regular file specified as */ 402 /* the output file */ 403 #define FLG_OF1_ALNODIR 0x80000000 /* establish NODIRECT for all */ 404 /* exported interfaces. */ 405 406 /* 407 * Test to see if the output file would allow the presence of 408 * a .dynsym section. 409 */ 410 #define OFL_ALLOW_DYNSYM(_ofl) (((_ofl)->ofl_flags & \ 411 (FLG_OF_DYNAMIC | FLG_OF_RELOBJ)) == FLG_OF_DYNAMIC) 412 413 /* 414 * Test to see if the output file would allow the presence of 415 * a .SUNW_ldynsym section. The requirements are that a .dynsym 416 * is allowed, and -znoldynsym has not been specified. Note that 417 * even if the answer is True (1), we will only generate one if there 418 * are local symbols that require it. 419 */ 420 #define OFL_ALLOW_LDYNSYM(_ofl) (((_ofl)->ofl_flags & \ 421 (FLG_OF_DYNAMIC | FLG_OF_RELOBJ | FLG_OF_NOLDYNSYM)) == FLG_OF_DYNAMIC) 422 423 /* 424 * Test to see if relocation processing should be done. This is normally 425 * true, but can be disabled via the '-z noreloc' option. Note that 426 * relocatable objects are still relocated even if '-z noreloc' is present. 427 */ 428 #define OFL_DO_RELOC(_ofl) (((_ofl)->ofl_flags & FLG_OF_RELOBJ) || \ 429 !((_ofl)->ofl_dtflags_1 & DF_1_NORELOC)) 430 431 /* 432 * Define a move descriptor used within relocation structures. 433 */ 434 typedef struct { 435 Move *mr_move; 436 Sym_desc *mr_sym; 437 } Mv_reloc; 438 439 /* 440 * Relocation (active & output) processing structure - transparent to common 441 * code. 442 * 443 * Note that rel_raddend is primarily only of interest to RELA relocations, 444 * and is set to 0 for REL. However, there is an exception: If FLG_REL_NADDEND 445 * is set, then rel_raddend contains a replacement value for the implicit 446 * addend found in the relocation target. 447 */ 448 struct rel_desc { 449 Os_desc *rel_osdesc; /* output section reloc is against */ 450 Is_desc *rel_isdesc; /* input section reloc is against */ 451 const char *rel_sname; /* symbol name (may be "unknown") */ 452 Sym_desc *rel_sym; /* sym relocation is against */ 453 Sym_desc *rel_usym; /* strong sym if this is a weak pair */ 454 Mv_reloc *rel_move; /* move table information */ 455 Word rel_flags; /* misc. flags for relocations */ 456 Word rel_rtype; /* relocation type */ 457 Xword rel_roffset; /* relocation offset */ 458 Sxword rel_raddend; /* addend from input relocation */ 459 Word rel_typedata; /* ELF_R_TYPE_DATA(info) */ 460 }; 461 462 /* 463 * common flags used on the Rel_desc structure (defined in machrel.h). 464 */ 465 #define FLG_REL_GOT 0x00000001 /* relocation against GOT */ 466 #define FLG_REL_PLT 0x00000002 /* relocation against PLT */ 467 #define FLG_REL_BSS 0x00000004 /* relocation against BSS */ 468 #define FLG_REL_LOAD 0x00000008 /* section loadable */ 469 #define FLG_REL_SCNNDX 0x00000010 /* use section index for symbol ndx */ 470 #define FLG_REL_CLVAL 0x00000020 /* clear VALUE for active relocation */ 471 #define FLG_REL_ADVAL 0x00000040 /* add VALUE for output relocation, */ 472 /* only relevant to SPARC and */ 473 /* R_SPARC_RELATIVE */ 474 #define FLG_REL_GOTCL 0x00000080 /* clear the GOT entry. This is */ 475 /* relevant to RELA relocations, */ 476 /* not REL (i386) relocations */ 477 #define FLG_REL_MOVETAB 0x00000100 /* Relocation against .SUNW_move */ 478 /* adjustments required before */ 479 /* actual relocation */ 480 #define FLG_REL_NOINFO 0x00000200 /* Relocation comes from a section */ 481 /* with a null sh_info field */ 482 #define FLG_REL_REG 0x00000400 /* Relocation target is reg sym */ 483 #define FLG_REL_FPTR 0x00000800 /* relocation against func. desc. */ 484 #define FLG_REL_RFPTR1 0x00001000 /* Relative relocation against */ 485 /* 1st part of FD */ 486 #define FLG_REL_RFPTR2 0x00002000 /* Relative relocation against */ 487 /* 2nd part of FD */ 488 #define FLG_REL_DISP 0x00004000 /* *disp* relocation */ 489 #define FLG_REL_STLS 0x00008000 /* IE TLS reference to */ 490 /* static TLS GOT index */ 491 #define FLG_REL_DTLS 0x00010000 /* GD TLS reference relative to */ 492 /* dynamic TLS GOT index */ 493 #define FLG_REL_MTLS 0x00020000 /* LD TLS reference against GOT */ 494 #define FLG_REL_STTLS 0x00040000 /* LE TLS reference directly */ 495 /* to static tls index */ 496 #define FLG_REL_TLSFIX 0x00080000 /* relocation points to TLS instr. */ 497 /* which needs updating */ 498 #define FLG_REL_RELA 0x00100000 /* descriptor captures a Rela */ 499 #define FLG_REL_GOTFIX 0x00200000 /* relocation points to GOTOP instr. */ 500 /* which needs updating */ 501 #define FLG_REL_NADDEND 0x00400000 /* Replace implicit addend in dest */ 502 /* with value in rel_raddend */ 503 /* Relevant to REL (i386) */ 504 /* relocations, not to RELA. */ 505 506 /* 507 * Structure to hold a cache of Relocations. 508 */ 509 struct rel_cache { 510 Rel_desc *rc_end; 511 Rel_desc *rc_free; 512 }; 513 514 /* 515 * Symbol value descriptor. For relocatable objects, each symbols value is 516 * its offset within its associated section. Therefore, to uniquely define 517 * each symbol within a reloctable object, record and sort the sh_offset and 518 * symbol value. This information is used to seach for displacement 519 * relocations as part of copy relocation validation. 520 */ 521 typedef struct { 522 Addr ssv_value; 523 Sym_desc *ssv_sdp; 524 } Ssv_desc; 525 526 /* 527 * Input file processing structures. 528 */ 529 struct ifl_desc { /* input file descriptor */ 530 const char *ifl_name; /* full file name */ 531 const char *ifl_soname; /* shared object name */ 532 dev_t ifl_stdev; /* device id and inode number for .so */ 533 ino_t ifl_stino; /* multiple inclusion checks */ 534 Ehdr *ifl_ehdr; /* elf header describing this file */ 535 Elf *ifl_elf; /* elf descriptor for this file */ 536 Sym_desc **ifl_oldndx; /* original symbol table indices */ 537 Sym_desc *ifl_locs; /* symbol desc version of locals */ 538 Ssv_desc *ifl_sortsyms; /* sorted list of symbols by value */ 539 Word ifl_locscnt; /* no. of local symbols to process */ 540 Word ifl_symscnt; /* total no. of symbols to process */ 541 Word ifl_sortcnt; /* no. of sorted symbols to process */ 542 Word ifl_shnum; /* number of sections in file */ 543 Word ifl_shstrndx; /* index to .shstrtab */ 544 Word ifl_vercnt; /* number of versions in file */ 545 Half ifl_neededndx; /* index to NEEDED in .dyn section */ 546 Word ifl_flags; /* Explicit/implicit reference */ 547 Is_desc **ifl_isdesc; /* isdesc[scn ndx] = Is_desc ptr */ 548 Sdf_desc *ifl_sdfdesc; /* control definition */ 549 Versym *ifl_versym; /* version symbol table array */ 550 Ver_index *ifl_verndx; /* verndx[ver ndx] = Ver_index */ 551 APlist *ifl_verdesc; /* version descriptor list */ 552 APlist *ifl_relsect; /* relocation section list */ 553 Alist *ifl_groups; /* SHT_GROUP section list */ 554 }; 555 556 #define FLG_IF_CMDLINE 0x00000001 /* full filename specified from the */ 557 /* command line (no -l) */ 558 #define FLG_IF_NEEDED 0x00000002 /* shared object should be recorded */ 559 #define FLG_IF_DIRECT 0x00000004 /* establish direct bindings to this */ 560 /* object */ 561 #define FLG_IF_EXTRACT 0x00000008 /* file extracted from an archive */ 562 #define FLG_IF_VERNEED 0x00000010 /* version dependency information is */ 563 /* required */ 564 #define FLG_IF_DEPREQD 0x00000020 /* dependency is required to satisfy */ 565 /* symbol references */ 566 #define FLG_IF_NEEDSTR 0x00000040 /* dependency specified by -Nn */ 567 /* flag */ 568 #define FLG_IF_IGNORE 0x00000080 /* ignore unused dependencies */ 569 #define FLG_IF_NODIRECT 0x00000100 /* object contains symbols that */ 570 /* cannot be directly bound to. */ 571 #define FLG_IF_LAZYLD 0x00000200 /* bindings to this object should be */ 572 /* lazy loaded */ 573 #define FLG_IF_GRPPRM 0x00000400 /* this dependency should have the */ 574 /* DF_P1_GROUPPERM flag set */ 575 #define FLG_IF_DISPPEND 0x00000800 /* displacement relocation done */ 576 /* in the ld time. */ 577 #define FLG_IF_DISPDONE 0x00001000 /* displacement relocation done */ 578 /* at the run time */ 579 #define FLG_IF_MAPFILE 0x00002000 /* file is a mapfile */ 580 #define FLG_IF_HSTRTAB 0x00004000 /* file has a string section */ 581 #define FLG_IF_FILEREF 0x00008000 /* file contains a section which */ 582 /* is included in the output */ 583 /* allocatable image */ 584 #define FLG_IF_GNUVER 0x00010000 /* file used GNU-style versioning */ 585 #define FLG_IF_ORDERED 0x00020000 /* ordered section processing */ 586 /* required */ 587 588 struct is_desc { /* input section descriptor */ 589 const char *is_name; /* original section name */ 590 Shdr *is_shdr; /* the elf section header */ 591 Ifl_desc *is_file; /* infile desc for this section */ 592 Os_desc *is_osdesc; /* new output section for this */ 593 /* input section */ 594 Elf_Data *is_indata; /* input sections raw data */ 595 Is_desc *is_symshndx; /* related SHT_SYM_SHNDX section */ 596 Is_desc *is_comdatkeep; /* If COMDAT section is discarded, */ 597 /* this is section that was kept */ 598 Word is_scnndx; /* original section index in file */ 599 Word is_ordndx; /* Index for section. Used to decide */ 600 /* where to insert section when */ 601 /* reordering sections */ 602 Word is_keyident; /* key for SHF_ORDERED processing */ 603 /* and identifier used for */ 604 /* placing/ordering sections */ 605 Word is_flags; /* Various flags */ 606 }; 607 608 #define FLG_IS_ORDERED 0x0001 /* this is a SHF_ORDERED section */ 609 #define FLG_IS_KEY 0x0002 /* section requires sort keys */ 610 #define FLG_IS_DISCARD 0x0004 /* section is to be discarded */ 611 #define FLG_IS_RELUPD 0x0008 /* symbol defined here may have moved */ 612 #define FLG_IS_SECTREF 0x0010 /* section has been referenced */ 613 #define FLG_IS_GDATADEF 0x0020 /* section contains global data sym */ 614 #define FLG_IS_EXTERNAL 0x0040 /* isp from an user file */ 615 #define FLG_IS_INSTRMRG 0x0080 /* Usable SHF_MERGE|SHF_STRINGS sec */ 616 #define FLG_IS_GNSTRMRG 0x0100 /* Generated mergeable string section */ 617 #define FLG_IS_GROUPS 0x0200 /* section has groups to process */ 618 #define FLG_IS_PLACE 0x0400 /* section requires to be placed */ 619 #define FLG_IS_COMDAT 0x0800 /* section is COMDAT */ 620 #define FLG_IS_EHFRAME 0x1000 /* section is .eh_frame */ 621 622 /* 623 * Map file and output file processing structures 624 */ 625 struct os_desc { /* Output section descriptor */ 626 const char *os_name; /* the section name */ 627 Elf_Scn *os_scn; /* the elf section descriptor */ 628 Shdr *os_shdr; /* the elf section header */ 629 Os_desc *os_relosdesc; /* the output relocation section */ 630 APlist *os_relisdescs; /* reloc input section descriptors */ 631 /* for this output section */ 632 APlist *os_isdescs; /* list of input sections in output */ 633 APlist *os_mstrisdescs; /* FLG_IS_INSTRMRG input sections */ 634 Sort_desc *os_sort; /* used for sorting sections */ 635 Sg_desc *os_sgdesc; /* segment os_desc is placed on */ 636 Elf_Data *os_outdata; /* output sections raw data */ 637 avl_tree_t *os_comdats; /* AVL tree of COMDAT input sections */ 638 /* associated to output section */ 639 Word os_identndx; /* section identifier for input */ 640 /* section processing, followed */ 641 /* by section symbol index */ 642 Word os_ordndx; /* index for section. Used to decide */ 643 /* where to insert section when */ 644 /* reordering sections */ 645 Xword os_szoutrels; /* size of output relocation section */ 646 uint_t os_namehash; /* hash on section name */ 647 uchar_t os_flags; /* various flags */ 648 }; 649 650 #define FLG_OS_KEY 0x01 /* section requires sort keys */ 651 #define FLG_OS_OUTREL 0x02 /* output rel against this section */ 652 #define FLG_OS_SECTREF 0x04 /* isps are not affected by -zignore */ 653 654 /* 655 * For sorting sections. 656 */ 657 struct sort_desc { 658 Is_desc **st_order; 659 Word st_ordercnt; 660 Is_desc **st_before; 661 Word st_beforecnt; 662 Is_desc **st_after; 663 Word st_aftercnt; 664 }; 665 666 /* 667 * Types of segment index. 668 */ 669 typedef enum { 670 LD_PHDR, 671 LD_INTERP, 672 LD_SUNWCAP, 673 LD_TEXT, 674 LD_DATA, 675 LD_BSS, 676 #if defined(_ELF64) 677 LD_LRODATA, /* (amd64-only) */ 678 LD_LDATA, /* (amd64-only) */ 679 #endif 680 LD_DYN, 681 LD_DTRACE, 682 LD_TLS, 683 LD_UNWIND, 684 LD_NOTE, 685 LD_EXTRA, 686 LD_NUM 687 } Segment_id; 688 689 struct sg_desc { /* output segment descriptor */ 690 Segment_id sg_id; /* segment identifier (for sorting) */ 691 Phdr sg_phdr; /* segment header for output file */ 692 const char *sg_name; /* segment name */ 693 Xword sg_round; /* data rounding required (mapfile) */ 694 Xword sg_length; /* maximum segment length; if 0 */ 695 /* segment is not specified */ 696 APlist *sg_osdescs; /* list of output section descriptors */ 697 APlist *sg_secorder; /* list specifying section ordering */ 698 /* for the segment */ 699 Half sg_flags; 700 Sym_desc *sg_sizesym; /* size symbol for this segment */ 701 Xword sg_addralign; /* LCM of sh_addralign */ 702 Elf_Scn *sg_fscn; /* the SCN of the first section. */ 703 }; 704 705 #define FLG_SG_VADDR 0x0001 /* vaddr segment attribute set */ 706 #define FLG_SG_PADDR 0x0002 /* paddr segment attribute set */ 707 #define FLG_SG_LENGTH 0x0004 /* length segment attribute set */ 708 #define FLG_SG_ALIGN 0x0008 /* align segment attribute set */ 709 #define FLG_SG_ROUND 0x0010 /* round segment attribute set */ 710 #define FLG_SG_FLAGS 0x0020 /* flags segment attribute set */ 711 #define FLG_SG_TYPE 0x0040 /* type segment attribute set */ 712 #define FLG_SG_ORDER 0x0080 /* has ordering been turned on for */ 713 /* this segment. */ 714 /* i.e. ?[O] option in mapfile */ 715 #define FLG_SG_NOHDR 0x0100 /* don't map ELF or phdrs into */ 716 /* this segment */ 717 #define FLG_SG_EMPTY 0x0200 /* an empty segment specification */ 718 /* no input sections will be */ 719 /* associated to this section */ 720 #define FLG_SG_KEY 0x0400 /* segment requires sort keys */ 721 #define FLG_SG_DISABLED 0x0800 /* this segment is disabled */ 722 #define FLG_SG_PHREQ 0x1000 /* this segment requires a program */ 723 /* header */ 724 725 struct sec_order { 726 const char *sco_secname; /* section name to be ordered */ 727 Word sco_index; /* ordering index for section */ 728 Half sco_flags; 729 }; 730 731 #define FLG_SGO_USED 0x0001 /* was ordering used? */ 732 733 struct ent_desc { /* input section entrance criteria */ 734 APlist *ec_files; /* files from which to accept */ 735 /* sections */ 736 const char *ec_name; /* name to match (NULL if none) */ 737 Word ec_type; /* section type */ 738 Word ec_attrmask; /* section attribute mask (AWX) */ 739 Word ec_attrbits; /* sections attribute bits */ 740 Sg_desc *ec_segment; /* output segment to enter if matched */ 741 Word ec_ordndx; /* index to determine where section */ 742 /* meeting this criteria should */ 743 /* inserted. Used for reordering */ 744 /* of sections. */ 745 Half ec_flags; 746 }; 747 748 #define FLG_EC_BUILTIN 0x0001 /* built in descriptor */ 749 #define FLG_EC_USED 0x0002 /* entrance criteria met? */ 750 751 /* 752 * One structure is allocated for a move entry, and associated to the symbol 753 * against which a move is targeted. 754 */ 755 typedef struct { 756 Move *md_move; /* original Move entry */ 757 Xword md_start; /* start position */ 758 Xword md_len; /* length of initialization */ 759 Word md_oidx; /* output Move entry index */ 760 } Mv_desc; 761 762 /* 763 * Symbol descriptor. 764 */ 765 struct sym_desc { 766 Alist *sd_GOTndxs; /* list of associated GOT entries */ 767 Sym *sd_sym; /* pointer to symbol table entry */ 768 Sym *sd_osym; /* copy of the original symbol entry */ 769 /* used only for local partial */ 770 Alist *sd_move; /* move information associated with a */ 771 /* partially initialized symbol */ 772 const char *sd_name; /* symbols name */ 773 Ifl_desc *sd_file; /* file where symbol is taken */ 774 Is_desc *sd_isc; /* input section of symbol definition */ 775 Sym_aux *sd_aux; /* auxiliary global symbol info. */ 776 Word sd_symndx; /* index in output symbol table */ 777 Word sd_shndx; /* sect. index sym is associated w/ */ 778 Word sd_flags; /* state flags */ 779 Half sd_flags1; /* more symbol flags */ 780 Half sd_ref; /* reference definition of symbol */ 781 }; 782 783 /* 784 * The auxiliary symbol descriptor contains the additional information (beyond 785 * the symbol descriptor) required to process global symbols. These symbols are 786 * accessed via an internal symbol hash table where locality of reference is 787 * important for performance. 788 */ 789 struct sym_aux { 790 APlist *sa_dfiles; /* files where symbol is defined */ 791 Sym sa_sym; /* copy of symtab entry */ 792 const char *sa_vfile; /* first unavailable definition */ 793 Ifl_desc *sa_bindto; /* symbol to bind to - for translator */ 794 const char *sa_rfile; /* file with first symbol referenced */ 795 Word sa_hash; /* the pure hash value of symbol */ 796 Word sa_PLTndx; /* index into PLT for symbol */ 797 Word sa_PLTGOTndx; /* GOT entry indx for PLT indirection */ 798 Word sa_linkndx; /* index of associated symbol from */ 799 /* ET_DYN file */ 800 Half sa_symspec; /* special symbol ids */ 801 Half sa_overndx; /* output file versioning index */ 802 Half sa_dverndx; /* dependency versioning index */ 803 }; 804 805 /* 806 * Nodes used to track symbols in the global AVL symbol dictionary. 807 */ 808 struct sym_avlnode { 809 avl_node_t sav_node; /* AVL node */ 810 Word sav_hash; /* symbol hash value */ 811 const char *sav_name; /* symbol name */ 812 Sym_desc *sav_symdesc; /* SymDesc entry */ 813 }; 814 815 /* 816 * These are the ids for processing of `Special symbols'. They are used 817 * to set the sym->sd_aux->sa_symspec field. 818 */ 819 #define SDAUX_ID_ETEXT 1 /* etext && _etext symbol */ 820 #define SDAUX_ID_EDATA 2 /* edata && _edata symbol */ 821 #define SDAUX_ID_END 3 /* end, _end, && _END_ symbol */ 822 #define SDAUX_ID_DYN 4 /* DYNAMIC && _DYNAMIC symbol */ 823 #define SDAUX_ID_PLT 5 /* _PROCEDURE_LINKAGE_TABLE_ symbol */ 824 #define SDAUX_ID_GOT 6 /* _GLOBAL_OFFSET_TABLE_ symbol */ 825 #define SDAUX_ID_START 7 /* START_ && _START_ symbol */ 826 827 /* 828 * Flags for sym_desc.sd_flags 829 */ 830 #define FLG_SY_MVTOCOMM 0x00000001 /* assign symbol to common (.bss) */ 831 /* this is a result of a */ 832 /* copy reloc against sym */ 833 #define FLG_SY_GLOBREF 0x00000002 /* a global reference has been seen */ 834 #define FLG_SY_WEAKDEF 0x00000004 /* a weak definition has been used */ 835 #define FLG_SY_CLEAN 0x00000008 /* `Sym' entry points to original */ 836 /* input file (read-only). */ 837 #define FLG_SY_UPREQD 0x00000010 /* symbol value update is required, */ 838 /* either it's used as an entry */ 839 /* point or for relocation, but */ 840 /* it must be updated even if */ 841 /* the -s flag is in effect */ 842 #define FLG_SY_NOTAVAIL 0x00000020 /* symbol is not available to the */ 843 /* application either because it */ 844 /* originates from an implicitly */ 845 /* referenced shared object, or */ 846 /* because it is not part of a */ 847 /* specified version. */ 848 #define FLG_SY_REDUCED 0x00000040 /* a global is reduced to local */ 849 #define FLG_SY_VERSPROM 0x00000080 /* version definition has been */ 850 /* promoted to output file */ 851 #define FLG_SY_PROT 0x00000100 /* stv_protected visibility seen */ 852 853 #define FLG_SY_MAPREF 0x00000200 /* symbol reference generated by user */ 854 /* from mapfile */ 855 #define FLG_SY_REFRSD 0x00000400 /* symbols sd_ref has been raised */ 856 /* due to a copy-relocs */ 857 /* weak-strong pairing */ 858 #define FLG_SY_INTPOSE 0x00000800 /* symbol defines an interposer */ 859 #define FLG_SY_INVALID 0x00001000 /* unwanted/erroneous symbol */ 860 #define FLG_SY_SMGOT 0x00002000 /* small got index assigned to symbol */ 861 /* sparc only */ 862 #define FLG_SY_PARENT 0x00004000 /* symbol to be found in parent */ 863 /* only used with direct bindings */ 864 #define FLG_SY_LAZYLD 0x00008000 /* symbol to cause lazyloading of */ 865 /* parent object */ 866 #define FLG_SY_ISDISC 0x00010000 /* symbol is a member of a DISCARDED */ 867 /* section (COMDAT) */ 868 #define FLG_SY_PAREXPN 0x00020000 /* partially init. symbol to be */ 869 /* expanded */ 870 #define FLG_SY_PLTPAD 0x00040000 /* pltpadding has been allocated for */ 871 /* this symbol */ 872 #define FLG_SY_REGSYM 0x00080000 /* REGISTER symbol (sparc only) */ 873 #define FLG_SY_SOFOUND 0x00100000 /* compared against an SO definition */ 874 #define FLG_SY_EXTERN 0x00200000 /* symbol is external, allows -zdefs */ 875 /* error suppression */ 876 #define FLG_SY_MAPUSED 0x00400000 /* mapfile symbol used (occurred */ 877 /* within a relocatable object) */ 878 #define FLG_SY_COMMEXP 0x00800000 /* COMMON symbol which has been */ 879 /* allocated */ 880 #define FLG_SY_CMDREF 0x01000000 /* symbol was referenced from the */ 881 /* command line. (ld -u <>, */ 882 /* ld -zrtldinfo=<>, ...) */ 883 #define FLG_SY_SPECSEC 0x02000000 /* section index is reserved value */ 884 /* ABS, COMMON, ... */ 885 #define FLG_SY_TENTSYM 0x04000000 /* tentative symbol */ 886 #define FLG_SY_VISIBLE 0x08000000 /* symbols visibility determined */ 887 #define FLG_SY_STDFLTR 0x10000000 /* symbol is a standard filter */ 888 #define FLG_SY_AUXFLTR 0x20000000 /* symbol is an auxiliary filter */ 889 #define FLG_SY_DYNSORT 0x40000000 /* req. in dyn[sym|tls]sort section */ 890 #define FLG_SY_NODYNSORT 0x80000000 /* excluded from dyn[sym_tls]sort sec */ 891 892 /* 893 * Sym_desc.sd_flags1 894 */ 895 #define FLG_SY1_DEFAULT 0x00000001 /* global symbol, default */ 896 #define FLG_SY1_SINGLE 0x00000002 /* global symbol, singleton defined */ 897 #define FLG_SY1_PROTECT 0x00000004 /* global symbol, protected defined */ 898 #define FLG_SY1_EXPORT 0x00000008 /* global symbol, exported defined */ 899 900 #define MSK_SY1_GLOBAL \ 901 (FLG_SY1_DEFAULT | FLG_SY1_SINGLE | FLG_SY1_PROTECT | FLG_SY1_EXPORT) 902 /* this mask indicates that the */ 903 /* symbol has been explicitly */ 904 /* defined within a mapfile */ 905 /* definition, and is a candidate */ 906 /* for versioning */ 907 908 #define FLG_SY1_HIDDEN 0x00000010 /* global symbol, reduce to local */ 909 #define FLG_SY1_ELIM 0x00000020 /* global symbol, eliminate */ 910 #define FLG_SY1_IGNORE 0x00000040 /* global symbol, ignored */ 911 912 #define MSK_SY1_LOCAL (FLG_SY1_HIDDEN | FLG_SY1_ELIM | FLG_SY1_IGNORE) 913 /* this mask allows all local state */ 914 /* flags to be removed when the */ 915 /* symbol is copy relocated */ 916 917 #define FLG_SY1_EXPDEF 0x00000100 /* symbol visibility defined */ 918 /* explicitly */ 919 920 #define MSK_SY1_NOAUTO (FLG_SY1_SINGLE | FLG_SY1_EXPORT | FLG_SY1_EXPDEF) 921 /* this mask indicates that the */ 922 /* symbol is not a candidate for */ 923 /* auto-reduction/elimination */ 924 925 #define FLG_SY1_MAPFILE 0x00000200 /* symbol attribute defined in a */ 926 /* mapfile */ 927 #define FLG_SY1_DIR 0x00000400 /* global symbol, direct bindings */ 928 #define FLG_SY1_NDIR 0x00000800 /* global symbol, nondirect bindings */ 929 #define FLG_SY1_OVERLAP 0x00001000 /* Move entry overlap detected */ 930 931 /* 932 * Create a mask for (sym.st_other & visibility) since the gABI does not yet 933 * define a ELF*_ST_OTHER macro. 934 */ 935 #define MSK_SYM_VISIBILITY 0x7 936 937 /* 938 * Structure to manage the shared object definition lists. There are two lists 939 * that use this structure: 940 * 941 * o ofl_soneed; maintain the list of implicitly required dependencies 942 * (ie. shared objects needed by other shared objects). These definitions 943 * may include RPATH's required to locate the dependencies, and any 944 * version requirements. 945 * 946 * o ofl_socntl; maintains the shared object control definitions. These are 947 * provided by the user (via a mapfile) and are used to indicate any 948 * SONAME translations and verion control requirements. 949 */ 950 struct sdf_desc { 951 const char *sdf_name; /* the shared objects file name */ 952 const char *sdf_soname; /* the shared objects SONAME */ 953 char *sdf_rpath; /* library search path DT_RPATH */ 954 const char *sdf_rfile; /* referencing file for diagnostics */ 955 Ifl_desc *sdf_file; /* the final input file descriptor */ 956 Alist *sdf_vers; /* list of versions that are required */ 957 /* from this object */ 958 Alist *sdf_verneed; /* list of VERNEEDS to create for */ 959 /* this object (via SPECVERS or */ 960 /* ADDVERS) */ 961 Word sdf_flags; 962 }; 963 964 #define FLG_SDF_SONAME 0x02 /* An alternative SONAME is supplied */ 965 #define FLG_SDF_SELECT 0x04 /* version control selection required */ 966 #define FLG_SDF_VERIFY 0x08 /* version definition verification */ 967 /* required */ 968 #define FLG_SDF_SPECVER 0x10 /* specify VERNEEDS */ 969 #define FLG_SDF_ADDVER 0x20 /* add VERNEED references */ 970 971 /* 972 * Structure to manage shared object version usage requirements. 973 */ 974 struct sdv_desc { 975 const char *sdv_name; /* version name */ 976 const char *sdv_ref; /* versions reference */ 977 Word sdv_flags; /* flags */ 978 }; 979 980 #define FLG_SDV_MATCHED 0x01 /* VERDEF found and matched */ 981 982 /* 983 * Structures to manage versioning information. Two versioning structures are 984 * defined: 985 * 986 * o a version descriptor maintains a linked list of versions and their 987 * associated dependencies. This is used to build the version definitions 988 * for an image being created (see map_symbol), and to determine the 989 * version dependency graph for any input files that are versioned. 990 * 991 * o a version index array contains each version of an input file that is 992 * being processed. It informs us which versions are available for 993 * binding, and is used to generate any version dependency information. 994 */ 995 struct ver_desc { 996 const char *vd_name; /* version name */ 997 Ifl_desc *vd_file; /* file that defined version */ 998 Word vd_hash; /* hash value of name */ 999 Half vd_ndx; /* coordinates with symbol index */ 1000 Half vd_flags; /* version information */ 1001 APlist *vd_deps; /* version dependencies */ 1002 Ver_desc *vd_ref; /* dependency's first reference */ 1003 }; 1004 1005 struct ver_index { 1006 const char *vi_name; /* dependency version name */ 1007 Half vi_flags; /* communicates availability */ 1008 Half vi_overndx; /* Index asssigned to this version in */ 1009 /* output object Verneed section */ 1010 Ver_desc *vi_desc; /* cross reference to descriptor */ 1011 }; 1012 1013 /* 1014 * Define any internal version descriptor flags ([vd|vi]_flags). Note that the 1015 * first byte is reserved for user visible flags (refer VER_FLG's in link.h). 1016 */ 1017 #define MSK_VER_USER 0x0f /* mask for user visible flags */ 1018 1019 #define FLG_VER_AVAIL 0x10 /* version is available for binding */ 1020 #define FLG_VER_REFER 0x20 /* version has been referenced */ 1021 #define FLG_VER_SPECVER 0x40 /* via $SPECVERS in mapfile. */ 1022 /* Cannot be normalized away */ 1023 #define FLG_VER_CYCLIC 0x80 /* a member of cyclic dependency */ 1024 1025 /* 1026 * isalist(1) descriptor - used to break an isalist string into its component 1027 * options. 1028 */ 1029 struct isa_opt { 1030 char *isa_name; /* individual isa option name */ 1031 size_t isa_namesz; /* and associated size */ 1032 }; 1033 1034 struct isa_desc { 1035 char *isa_list; /* sysinfo(SI_ISALIST) list */ 1036 size_t isa_listsz; /* and associated size */ 1037 Isa_opt *isa_opt; /* table of individual isa options */ 1038 size_t isa_optno; /* and associated number */ 1039 }; 1040 1041 /* 1042 * uname(2) descriptor - used to break a utsname structure into its component 1043 * options (at least those that we're interested in). 1044 */ 1045 struct uts_desc { 1046 char *uts_osname; /* operating system name */ 1047 size_t uts_osnamesz; /* and associated size */ 1048 char *uts_osrel; /* operating system release */ 1049 size_t uts_osrelsz; /* and associated size */ 1050 }; 1051 1052 /* 1053 * SHT_GROUP descriptor - used to track group sections at the global 1054 * level to resolve conflicts and determine which to keep. 1055 */ 1056 struct group_desc { 1057 Is_desc *gd_isc; /* input section descriptor */ 1058 Is_desc *gd_oisc; /* overriding input section */ 1059 /* descriptor when discarded */ 1060 const char *gd_name; /* group name (signature symbol) */ 1061 Word *gd_data; /* data for group section */ 1062 size_t gd_cnt; /* number of entries in group data */ 1063 }; 1064 1065 /* 1066 * Indexes into the ld_support_funcs[] table. 1067 */ 1068 typedef enum { 1069 LDS_VERSION = 0, /* Must be first and have value 0 */ 1070 LDS_INPUT_DONE, 1071 LDS_START, 1072 LDS_ATEXIT, 1073 LDS_OPEN, 1074 LDS_FILE, 1075 LDS_INSEC, 1076 LDS_SEC, 1077 LDS_NUM 1078 } Support_ndx; 1079 1080 /* 1081 * Structure to manage archive member caching. Each archive has an archive 1082 * descriptor (Ar_desc) associated with it. This contains pointers to the 1083 * archive symbol table (obtained by elf_getarsyms(3e)) and an auxiliary 1084 * structure (Ar_uax[]) that parallels this symbol table. The member element 1085 * of this auxiliary table indicates whether the archive member associated with 1086 * the symbol offset has already been extracted (AREXTRACTED) or partially 1087 * processed (refer process_member()). 1088 */ 1089 typedef struct ar_mem { 1090 Elf *am_elf; /* elf descriptor for this member */ 1091 char *am_name; /* members name */ 1092 char *am_path; /* path (ie. lib(foo.o)) */ 1093 Sym *am_syms; /* start of global symbols */ 1094 char *am_strs; /* associated string table start */ 1095 Xword am_symn; /* no. of global symbols */ 1096 } Ar_mem; 1097 1098 typedef struct ar_aux { 1099 Sym_desc *au_syms; /* internal symbol descriptor */ 1100 Ar_mem *au_mem; /* associated member */ 1101 } Ar_aux; 1102 1103 #define FLG_ARMEM_PROC (Ar_mem *)-1 1104 1105 typedef struct ar_desc { 1106 const char *ad_name; /* archive file name */ 1107 Elf *ad_elf; /* elf descriptor for the archive */ 1108 Elf_Arsym *ad_start; /* archive symbol table start */ 1109 Ar_aux *ad_aux; /* auxiliary symbol information */ 1110 dev_t ad_stdev; /* device id and inode number for */ 1111 ino_t ad_stino; /* multiple inclusion checks */ 1112 ofl_flag_t ad_flags; /* archive specific cmd line flags */ 1113 } Ar_desc; 1114 1115 /* 1116 * Define any archive descriptor flags. NOTE, make sure they do not clash with 1117 * any output file descriptor archive extraction flags, as these are saved in 1118 * the same entry (see MSK_OF1_ARCHIVE). 1119 */ 1120 #define FLG_ARD_EXTRACT 0x00010000 /* archive member has been extracted */ 1121 1122 /* 1123 * Function Declarations. 1124 */ 1125 #if defined(_ELF64) 1126 1127 #define ld_create_outfile ld64_create_outfile 1128 #define ld_ent_setup ld64_ent_setup 1129 #define ld_init_strings ld64_init_strings 1130 #define ld_init_target ld64_init_target 1131 #define ld_make_sections ld64_make_sections 1132 #define ld_main ld64_main 1133 #define ld_ofl_cleanup ld64_ofl_cleanup 1134 #define ld_process_mem ld64_process_mem 1135 #define ld_reloc_init ld64_reloc_init 1136 #define ld_reloc_process ld64_reloc_process 1137 #define ld_sym_validate ld64_sym_validate 1138 #define ld_update_outfile ld64_update_outfile 1139 1140 #else 1141 1142 #define ld_create_outfile ld32_create_outfile 1143 #define ld_ent_setup ld32_ent_setup 1144 #define ld_init_strings ld32_init_strings 1145 #define ld_init_target ld32_init_target 1146 #define ld_make_sections ld32_make_sections 1147 #define ld_main ld32_main 1148 #define ld_ofl_cleanup ld32_ofl_cleanup 1149 #define ld_process_mem ld32_process_mem 1150 #define ld_reloc_init ld32_reloc_init 1151 #define ld_reloc_process ld32_reloc_process 1152 #define ld_sym_validate ld32_sym_validate 1153 #define ld_update_outfile ld32_update_outfile 1154 1155 #endif 1156 1157 extern int ld_getopt(Lm_list *, int, int, char **); 1158 1159 extern int ld32_main(int, char **, Half); 1160 extern int ld64_main(int, char **, Half); 1161 1162 extern uintptr_t ld_create_outfile(Ofl_desc *); 1163 extern uintptr_t ld_ent_setup(Ofl_desc *, Xword); 1164 extern uintptr_t ld_init_strings(Ofl_desc *); 1165 extern int ld_init_target(Lm_list *, Half mach); 1166 extern uintptr_t ld_make_sections(Ofl_desc *); 1167 extern void ld_ofl_cleanup(Ofl_desc *); 1168 extern Ifl_desc *ld_process_mem(const char *, const char *, char *, 1169 size_t, Ofl_desc *, Rej_desc *); 1170 extern uintptr_t ld_reloc_init(Ofl_desc *); 1171 extern uintptr_t ld_reloc_process(Ofl_desc *); 1172 extern uintptr_t ld_sym_validate(Ofl_desc *); 1173 extern uintptr_t ld_update_outfile(Ofl_desc *); 1174 1175 #ifdef __cplusplus 1176 } 1177 #endif 1178 1179 #endif /* _LIBLD_H */ 1180