/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright (c) 1988 AT&T * All Rights Reserved * * Copyright (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved. * Copyright 2024 Oxide Computer Company */ #ifndef _LIBLD_H #define _LIBLD_H #include <stdlib.h> #include <libelf.h> #include <sgs.h> #include <_machelf.h> #include <string_table.h> #include <sys/avl.h> #include <alist.h> #include <elfcap.h> #ifdef __cplusplus extern "C" { #endif /* * Default directory search path manipulation for the link-editor. YLDIR * indicates which directory in LIBPATH is replaced by the -YL option to cc * and ld. YUDIR indicates which directory is replaced by -YU. */ #define YLDIR 1 #define YUDIR 2 /* * Define a hash value that can never be returned from elf_hash(). */ #define SYM_NOHASH (~(Word)0) /* * Macro that can be used to represent both ORDER flags * in a section header. */ #define ALL_SHF_ORDER (SHF_ORDERED | SHF_LINK_ORDER) /* * The linker merges (concatenates) sections with the same name and * compatible section header flags. When comparing these flags, * there are some that should not be included in the decision. * The ALL_SHF_IGNORE constant defines these flags. * * NOTE: SHF_MERGE|SHF_STRINGS: * The compiler is allowed to set the SHF_MERGE|SHF_STRINGS flags in * order to tell the linker that: * * 1) There is nothing in the section except null terminated strings. * 2) Those strings do not contain NULL bytes, except as termination. * 3) All references to these strings occur via standard relocation * records. * * As a result, if two compatible sections both have these flags set, it is * OK to combine the strings they contain into a single merged string table * with duplicates removed and tail strings merged. * * This is a different meaning than the simple concatenating of sections * that the linker always does. It is a hint that an additional optimization * is possible, but not required. This means that sections that do not * share the same SHF_MERGE|SHF_STRINGS values can be concatenated, * but cannot have their duplicate strings combined. Hence, the * SHF_MERGE|SHF_STRINGS flags should be ignored when deciding whether * two sections can be concatenated. */ #define ALL_SHF_IGNORE (ALL_SHF_ORDER | SHF_GROUP | SHF_MERGE | SHF_STRINGS) /* * Define symbol reference types for use in symbol resolution. */ typedef enum { REF_DYN_SEEN, /* a .so symbol has been seen */ REF_DYN_NEED, /* a .so symbol satisfies a .o symbol */ REF_REL_NEED, /* a .o symbol */ REF_NUM /* the number of symbol references */ } Symref; /* * Relocation descriptor cache */ struct rel_cache { APlist *rc_list; /* list of Rel_cachebuf */ Word rc_cnt; /* and count */ }; /* * GOT reference models */ typedef enum { GOT_REF_GENERIC, /* generic symbol reference */ GOT_REF_TLSIE, /* TLS initial exec (gnu) reference */ GOT_REF_TLSLD, /* TLS local dynamic reference */ GOT_REF_TLSGD /* TLS general dynamic reference */ } Gotref; typedef struct { Xword gn_addend; /* addend associated with GOT entry */ Sword gn_gotndx; /* GOT table index */ Gotref gn_gotref; } Gotndx; /* * Got debugging structure. The got index is defined as a signed value as we * do so much mucking around with negative and positive gots on SPARC, and sign * extension is necessary when building 64-bit objects. On intel we explicitly * cast this variable to an unsigned value. */ typedef struct { Sym_desc *gt_sym; Gotndx gt_gndx; } Gottable; /* * The link-editor caches the results of sloppy relocation processing * in a variable of type Rlxrel_cache. Symbols come for processing in sorted * order, so a single item cache suffices to eliminate duplicate lookups. * * When sloppy relocation processing fails, the Rlxrel_rej enum reports * the underlying reason. */ typedef enum { RLXREL_REJ_NONE = 0, /* Replacement symbol was found */ RLXREL_REJ_TARGET, /* Target sec disallows relaxed relocations */ RLXREL_REJ_SECTION, /* Either there is no replacement section, */ /* or its attributes are incompatible */ RLXREL_REJ_SYMBOL, /* Replacement symbol not found */ } Rlxrel_rej; typedef struct sreloc_cache { Sym_desc *sr_osdp; /* Original symbol */ Sym_desc *sr_rsdp; /* Replacement symbol */ Rlxrel_rej sr_rej; /* Reason for failure if NULL sr_rsdp */ } Rlxrel_cache; /* * Nodes in an ofl_wrap AVL tree * * wsn_name is the name of the symbol to be wrapped. wsn_wrapname is used * when we need to refer to the wrap symbol, and consists of the symbol * name with a __wrap_ prefix. */ typedef struct wrap_sym_node { avl_node_t wsn_avlnode; /* AVL book-keeping */ const char *wsn_name; /* Symbol name: XXX */ const char *wsn_wrapname; /* Wrap symbol name: __wrap_XXX */ } WrapSymNode; /* * Capabilities structures, used to maintain a capabilities set. * * Capabilities can be defined within input relocatable objects, and can be * augmented or replaced by mapfile directives. In addition, mapfile directives * can be used to exclude capabilities that would otherwise be carried over to * the output object. * * CA_SUNW_HW_1, CA_SUNW_SF_1 and CA_SUNW_HW_2 values are bitmasks. A current * value, and an exclude value are maintained for each capability. * * There can be multiple CA_SUNW_PLAT and CA_SUNW_MACH entries and thus Alists * are used to collect these entries. A current list for each capability is * maintained as Capstr entries, which provide for maintaining the strings * eventual index into a string table. An exclude list is maintained as a * list of string pointers. */ typedef struct { elfcap_mask_t cm_val; /* bitmask value */ elfcap_mask_t cm_exc; /* bits to exclude from final object */ } Capmask; typedef struct { Alist *cl_val; /* string (Capstr) value */ APlist *cl_exc; /* strings to exclude from final */ } Caplist; /* object */ typedef struct { char *cs_str; /* platform or machine name */ Word cs_ndx; /* the entries output Cap index */ } Capstr; typedef uint_t oc_flag_t; typedef struct { Capmask oc_hw_1; /* CA_SUNW_HW_1 capabilities */ Capmask oc_sf_1; /* CA_SUNW_SF_1 capabilities */ Capmask oc_hw_2; /* CA_SUNW_HW_2 capabilities */ Caplist oc_plat; /* CA_SUNW_PLAT capabilities */ Caplist oc_mach; /* CA_SUNW_MACH capabilities */ Capstr oc_id; /* CA_SUNW_ID capability */ Capmask oc_hw_3; /* CA_SUNW_HW_3 capabilities */ oc_flag_t oc_flags; } Objcapset; #define FLG_OCS_USRDEFID 0x1 /* user defined CA_SUNW_ID */ /* * Bitmasks for a single capability. Capabilities come from input objects, * augmented or replaced by mapfile directives. In addition, mapfile directives * can be used to exclude bits that would otherwise be set in the output object. */ typedef struct { elfcap_mask_t cm_value; /* Bitmask value */ elfcap_mask_t cm_exclude; /* Bits to remove from final object */ } CapMask; /* * Combine the bitmask in a CapMask with the exclusion mask and * return the resulting final value. */ #define CAPMASK_VALUE(_cbmp) ((_cbmp)->cm_value & ~(_cbmp)->cm_exclude) typedef struct { CapMask c_hw_1; /* CA_SUNW_HW_1 capabilities */ CapMask c_sf_1; /* CA_SUNW_SF_1 capabilities */ CapMask c_hw_2; /* CA_SUNW_HW_2 capabilities */ } Outcapset; /* * Output file processing structure */ typedef Lword ofl_flag_t; typedef Word ofl_guideflag_t; struct ofl_desc { char *ofl_sgsid; /* link-editor identification */ const char *ofl_name; /* full file name */ Elf *ofl_elf; /* elf_memory() elf descriptor */ Elf *ofl_welf; /* ELF_C_WRITE elf descriptor */ Ehdr *ofl_dehdr; /* default elf header, and new elf */ Ehdr *ofl_nehdr; /* header describing this file */ Phdr *ofl_phdr; /* program header descriptor */ Phdr *ofl_tlsphdr; /* TLS phdr */ int ofl_fd; /* file descriptor */ size_t ofl_size; /* image size */ APlist *ofl_maps; /* list of input mapfiles */ APlist *ofl_segs; /* list of segments */ APlist *ofl_segs_order; /* SEGMENT_ORDER segments */ avl_tree_t ofl_segs_avl; /* O(log N) access to named segments */ APlist *ofl_ents; /* list of entrance descriptors */ avl_tree_t ofl_ents_avl; /* O(log N) access to named ent. desc */ APlist *ofl_objs; /* relocatable object file list */ Word ofl_objscnt; /* and count */ APlist *ofl_ars; /* archive library list */ Word ofl_arscnt; /* and count */ int ofl_ars_gsandx; /* archive group argv index. 0 means */ /* no current group, < 0 means */ /* error reported. >0 is cur ndx */ Word ofl_ars_gsndx; /* current -zrescan-start ofl_ars ndx */ APlist *ofl_sos; /* shared object list */ Word ofl_soscnt; /* and count */ APlist *ofl_soneed; /* list of implicitly required .so's */ APlist *ofl_socntl; /* list of .so control definitions */ Rel_cache ofl_outrels; /* list of output relocations */ Rel_cache ofl_actrels; /* list of relocations to perform */ APlist *ofl_relaux; /* Rel_aux cache for outrels/actrels */ Word ofl_entrelscnt; /* no of relocations entered */ Alist *ofl_copyrels; /* list of copy relocations */ APlist *ofl_ordered; /* list of shf_ordered sections */ APlist *ofl_symdtent; /* list of syminfo symbols that need */ /* to reference .dynamic entries */ APlist *ofl_ismove; /* list of .SUNW_move sections */ APlist *ofl_ismoverel; /* list of relocation input section */ /* targeting to expanded area */ APlist *ofl_parsyms; /* list of partially initialized */ /* symbols (ie. move symbols) */ APlist *ofl_extrarels; /* relocation sections which have */ /* a NULL sh_info */ avl_tree_t *ofl_groups; /* pointer to head of Groups AVL tree */ APlist *ofl_initarray; /* list of init array func names */ APlist *ofl_finiarray; /* list of fini array func names */ APlist *ofl_preiarray; /* list of preinit array func names */ APlist *ofl_rtldinfo; /* list of rtldinfo syms */ APlist *ofl_osgroups; /* list of output GROUP sections */ APlist *ofl_ostlsseg; /* pointer to sections in TLS segment */ APlist *ofl_unwind; /* list of unwind output sections */ Os_desc *ofl_unwindhdr; /* Unwind hdr */ avl_tree_t ofl_symavl; /* pointer to head of Syms AVL tree */ Sym_desc **ofl_regsyms; /* array of potential register */ Word ofl_regsymsno; /* symbols and array count */ Word ofl_regsymcnt; /* no. of output register symbols */ Word ofl_lregsymcnt; /* no. of local register symbols */ Sym_desc *ofl_dtracesym; /* ld -zdtrace= */ ofl_flag_t ofl_flags; /* various state bits, args etc. */ ofl_flag_t ofl_flags1; /* more flags */ void *ofl_entry; /* entry point (-e and Sym_desc *) */ char *ofl_filtees; /* shared objects we are a filter for */ const char *ofl_soname; /* (-h option) output file name for */ /* dynamic structure */ const char *ofl_interp; /* interpreter name used by exec() */ char *ofl_rpath; /* run path to store in .dynamic */ char *ofl_config; /* config path to store in .dynamic */ APlist *ofl_ulibdirs; /* user supplied library search list */ APlist *ofl_dlibdirs; /* default library search list */ Word ofl_vercnt; /* number of versions to generate */ APlist *ofl_verdesc; /* list of version descriptors */ size_t ofl_verdefsz; /* size of version definition section */ size_t ofl_verneedsz; /* size of version needed section */ Word ofl_entercnt; /* no. of global symbols entered */ Word ofl_globcnt; /* no. of global symbols to output */ Word ofl_scopecnt; /* no. of scoped symbols to output */ Word ofl_dynscopecnt; /* no. scoped syms in .SUNW_ldynsym */ Word ofl_elimcnt; /* no. of eliminated symbols */ Word ofl_locscnt; /* no. of local symbols in .symtab */ Word ofl_dynlocscnt; /* no. local symbols in .SUNW_ldynsym */ Word ofl_dynsymsortcnt; /* no. ndx in .SUNW_dynsymsort */ Word ofl_dyntlssortcnt; /* no. ndx in .SUNW_dyntlssort */ Word ofl_dynshdrcnt; /* no. of output section in .dynsym */ Word ofl_shdrcnt; /* no. of output sections */ Word ofl_caploclcnt; /* no. of local capabilities symbols */ Word ofl_capsymcnt; /* no. of symbol capabilities entries */ /* required */ Word ofl_capchaincnt; /* no. of Capchain symbols */ APlist *ofl_capgroups; /* list of capabilities groups */ avl_tree_t *ofl_capfamilies; /* capability family AVL tree */ Str_tbl *ofl_shdrsttab; /* Str_tbl for shdr strtab */ Str_tbl *ofl_strtab; /* Str_tbl for symtab strtab */ Str_tbl *ofl_dynstrtab; /* Str_tbl for dymsym strtab */ Gotndx *ofl_tlsldgotndx; /* index to LD TLS_index structure */ Xword ofl_relocsz; /* size of output relocations */ Xword ofl_relocgotsz; /* size of .got relocations */ Xword ofl_relocpltsz; /* size of .plt relocations */ Xword ofl_relocbsssz; /* size of .bss (copy) relocations */ Xword ofl_relocrelsz; /* size of .rel[a] relocations */ Word ofl_relocincnt; /* no. of input relocations */ Word ofl_reloccnt; /* tot number of output relocations */ Word ofl_reloccntsub; /* tot numb of output relocations to */ /* skip (-zignore) */ Word ofl_relocrelcnt; /* tot number of relative */ /* relocations */ Word ofl_gotcnt; /* no. of .got entries */ Word ofl_pltcnt; /* no. of .plt entries */ Word ofl_pltpad; /* no. of .plt padd entries */ Word ofl_hashbkts; /* no. of hash buckets required */ Is_desc *ofl_isbss; /* .bss input section (globals) */ Is_desc *ofl_islbss; /* .lbss input section (globals) */ Is_desc *ofl_istlsbss; /* .tlsbss input section (globals) */ Is_desc *ofl_isparexpn; /* -z nopartial .data input section */ Os_desc *ofl_osdynamic; /* .dynamic output section */ Os_desc *ofl_osdynsym; /* .dynsym output section */ Os_desc *ofl_osldynsym; /* .SUNW_ldynsym output section */ Os_desc *ofl_osdynstr; /* .dynstr output section */ Os_desc *ofl_osdynsymsort; /* .SUNW_dynsymsort output section */ Os_desc *ofl_osdyntlssort; /* .SUNW_dyntlssort output section */ Os_desc *ofl_osgot; /* .got output section */ Os_desc *ofl_oshash; /* .hash output section */ Os_desc *ofl_osinitarray; /* .init_array output section */ Os_desc *ofl_osfiniarray; /* .fini_array output section */ Os_desc *ofl_ospreinitarray; /* .preinit_array output section */ Os_desc *ofl_osinterp; /* .interp output section */ Os_desc *ofl_oscap; /* .SUNW_cap output section */ Os_desc *ofl_oscapinfo; /* .SUNW_capinfo output section */ Os_desc *ofl_oscapchain; /* .SUNW_capchain output section */ Os_desc *ofl_osplt; /* .plt output section */ Os_desc *ofl_osmove; /* .SUNW_move output section */ Os_desc *ofl_osrelhead; /* first relocation section */ Os_desc *ofl_osrel; /* .rel[a] relocation section */ Os_desc *ofl_osshstrtab; /* .shstrtab output section */ Os_desc *ofl_osstrtab; /* .strtab output section */ Os_desc *ofl_ossymtab; /* .symtab output section */ Os_desc *ofl_ossymshndx; /* .symtab_shndx output section */ Os_desc *ofl_osdynshndx; /* .dynsym_shndx output section */ Os_desc *ofl_osldynshndx; /* .SUNW_ldynsym_shndx output sec */ Os_desc *ofl_osverdef; /* .version definition output section */ Os_desc *ofl_osverneed; /* .version needed output section */ Os_desc *ofl_osversym; /* .version symbol ndx output section */ Word ofl_dtflags_1; /* DT_FLAGS_1 entries */ Word ofl_dtflags; /* DT_FLAGS entries */ Os_desc *ofl_ossyminfo; /* .SUNW_syminfo output section */ Half ofl_parexpnndx; /* -z nopartial section index */ /* Ref. at perform_outreloc() in */ /* libld/{mach}/machrel.c */ Xword *ofl_checksum; /* DT_CHECKSUM value address */ char *ofl_depaudit; /* dependency auditing required (-P) */ char *ofl_audit; /* object auditing required (-p) */ Alist *ofl_symfltrs; /* per-symbol filtees and their */ Alist *ofl_dtsfltrs; /* associated .dynamic/.dynstrs */ Objcapset ofl_ocapset; /* object capabilities */ Lm_list *ofl_lml; /* runtime link-map list */ Gottable *ofl_gottable; /* debugging got information */ Rlxrel_cache ofl_sr_cache; /* Cache last result from */ /* sloppy_comdat_reloc() */ APlist *ofl_maptext; /* mapfile added text sections */ APlist *ofl_mapdata; /* mapfile added data sections */ avl_tree_t *ofl_wrap; /* -z wrap symbols */ ofl_guideflag_t ofl_guideflags; /* -z guide flags */ APlist *ofl_assdeflib; /* -z assert-deflib exceptions */ int ofl_aslr; /* -z aslr, -1 disable, 1 enable */ APlist *ofl_symasserts; /* assertions about symbols */ /* from mapfiles */ }; #define FLG_OF_DYNAMIC 0x00000001 /* generate dynamic output module */ #define FLG_OF_STATIC 0x00000002 /* generate static output module */ #define FLG_OF_EXEC 0x00000004 /* generate an executable */ #define FLG_OF_RELOBJ 0x00000008 /* generate a relocatable object */ #define FLG_OF_SHAROBJ 0x00000010 /* generate a shared object */ #define FLG_OF_BFLAG 0x00000020 /* do no special plt building: -b */ #define FLG_OF_IGNENV 0x00000040 /* ignore LD_LIBRARY_PATH: -i */ #define FLG_OF_STRIP 0x00000080 /* strip output: -s */ #define FLG_OF_NOWARN 0x00000100 /* disable symbol warnings: -t */ #define FLG_OF_NOUNDEF 0x00000200 /* allow no undefined symbols: -zdefs */ #define FLG_OF_PURETXT 0x00000400 /* allow no text relocations: -ztext */ #define FLG_OF_GENMAP 0x00000800 /* generate a memory map: -m */ #define FLG_OF_DYNLIBS 0x00001000 /* dynamic input allowed: -Bdynamic */ #define FLG_OF_SYMBOLIC 0x00002000 /* bind global symbols: -Bsymbolic */ #define FLG_OF_ADDVERS 0x00004000 /* add version stamp: -Qy */ #define FLG_OF_NOLDYNSYM 0x00008000 /* -znoldynsym set */ #define FLG_OF_IS_ORDER 0x00010000 /* input section ordering within a */ /* segment is required */ #define FLG_OF_EC_FILES 0x00020000 /* Ent_desc exist w/non-NULL ec_files */ #define FLG_OF_TEXTREL 0x00040000 /* text relocations have been found */ #define FLG_OF_MULDEFS 0x00080000 /* multiple symbols are allowed */ #define FLG_OF_TLSPHDR 0x00100000 /* a TLS program header is required */ #define FLG_OF_BLDGOT 0x00200000 /* build GOT table */ #define FLG_OF_VERDEF 0x00400000 /* record version definitions */ #define FLG_OF_VERNEED 0x00800000 /* record version dependencies */ #define FLG_OF_NOVERSEC 0x01000000 /* don't record version sections */ #define FLG_OF_KEY 0x02000000 /* file requires sort keys */ #define FLG_OF_PROCRED 0x04000000 /* process any symbol reductions by */ /* effecting the symbol table */ /* output and relocations */ #define FLG_OF_SYMINFO 0x08000000 /* create a syminfo section */ #define FLG_OF_AUX 0x10000000 /* ofl_filter is an auxiliary filter */ #define FLG_OF_FATAL 0x20000000 /* fatal error during input */ #define FLG_OF_WARN 0x40000000 /* warning during input processing. */ #define FLG_OF_VERBOSE 0x80000000 /* -z verbose flag set */ #define FLG_OF_MAPSYMB 0x000100000000 /* symbolic scope definition seen */ #define FLG_OF_MAPGLOB 0x000200000000 /* global scope definition seen */ #define FLG_OF_COMREL 0x000400000000 /* -z combreloc set, which enables */ /* DT_RELACNT tracking, */ #define FLG_OF_NOCOMREL 0x000800000000 /* -z nocombreloc set */ #define FLG_OF_AUTOLCL 0x001000000000 /* automatically reduce unspecified */ /* global symbols to locals */ #define FLG_OF_AUTOELM 0x002000000000 /* automatically eliminate */ /* unspecified global symbols */ #define FLG_OF_REDLSYM 0x004000000000 /* reduce local symbols */ #define FLG_OF_OS_ORDER 0x008000000000 /* output section ordering required */ #define FLG_OF_OSABI 0x010000000000 /* tag object as ELFOSABI_SOLARIS */ #define FLG_OF_ADJOSCNT 0x020000000000 /* adjust ofl_shdrcnt to accommodate */ /* discarded sections */ #define FLG_OF_OTOSCAP 0x040000000000 /* convert object capabilities to */ /* symbol capabilities */ #define FLG_OF_PTCAP 0x080000000000 /* PT_SUNWCAP required */ #define FLG_OF_CAPSTRS 0x100000000000 /* capability strings are required */ #define FLG_OF_EHFRAME 0x200000000000 /* output contains .eh_frame section */ #define FLG_OF_FATWARN 0x400000000000 /* make warnings fatal */ #define FLG_OF_ADEFLIB 0x800000000000 /* no libraries in default path */ #define FLG_OF_KMOD 0x1000000000000 /* output is a kernel module */ /* * In the flags1 arena, establish any options that are applicable to archive * extraction first, and associate a mask. These values are recorded with any * archive descriptor so that they may be reset should the archive require a * rescan to try and resolve undefined symbols. */ #define FLG_OF1_ALLEXRT 0x0000000001 /* extract all members from an */ /* archive file */ #define FLG_OF1_WEAKEXT 0x0000000002 /* allow archive extraction to */ /* resolve weak references */ #define MSK_OF1_ARCHIVE 0x0000000003 /* archive flags mask */ #define FLG_OF1_NOINTRP 0x0000000008 /* -z nointerp flag set */ #define FLG_OF1_ZDIRECT 0x0000000010 /* -z direct flag set */ #define FLG_OF1_NDIRECT 0x0000000020 /* no-direct bindings specified */ #define FLG_OF1_DEFERRED 0x0000000040 /* deferred dependency recording */ #define FLG_OF1_RELDYN 0x0000000100 /* process .dynamic in rel obj */ #define FLG_OF1_NRLXREL 0x0000000200 /* -z norelaxreloc flag set */ #define FLG_OF1_RLXREL 0x0000000400 /* -z relaxreloc flag set */ #define FLG_OF1_IGNORE 0x0000000800 /* ignore unused dependencies */ #define FLG_OF1_NOSGHND 0x0000001000 /* -z nosighandler flag set */ #define FLG_OF1_TEXTOFF 0x0000002000 /* text relocations are ok */ #define FLG_OF1_ABSEXEC 0x0000004000 /* -zabsexec set */ #define FLG_OF1_LAZYLD 0x0000008000 /* lazy loading of objects enabled */ #define FLG_OF1_GRPPRM 0x0000010000 /* dependencies are to have */ /* GROUPPERM enabled */ #define FLG_OF1_NOPARTI 0x0000040000 /* -znopartial set */ #define FLG_OF1_BSSOREL 0x0000080000 /* output relocation against bss */ /* section */ #define FLG_OF1_TLSOREL 0x0000100000 /* output relocation against .tlsbss */ /* section */ #define FLG_OF1_MEMORY 0x0000200000 /* produce a memory model */ #define FLG_OF1_NGLBDIR 0x0000400000 /* no DT_1_DIRECT flag allowed */ #define FLG_OF1_ENCDIFF 0x0000800000 /* host running linker has different */ /* byte order than output object */ #define FLG_OF1_VADDR 0x0001000000 /* a segment defines explicit vaddr */ #define FLG_OF1_EXTRACT 0x0002000000 /* archive member has been extracted */ #define FLG_OF1_RESCAN 0x0004000000 /* any archives should be rescanned */ #define FLG_OF1_IGNPRC 0x0008000000 /* ignore processing required */ #define FLG_OF1_NCSTTAB 0x0010000000 /* -znocompstrtab set */ #define FLG_OF1_DONE 0x0020000000 /* link-editor processing complete */ #define FLG_OF1_NONREG 0x0040000000 /* non-regular file specified as */ /* the output file */ #define FLG_OF1_ALNODIR 0x0080000000 /* establish NODIRECT for all */ /* exported interfaces. */ #define FLG_OF1_OVHWCAP1 0x0100000000 /* override CA_SUNW_HW_1 capabilities */ #define FLG_OF1_OVSFCAP1 0x0200000000 /* override CA_SUNW_SF_1 capabilities */ #define FLG_OF1_OVHWCAP2 0x0400000000 /* override CA_SUNW_HW_2 capabilities */ #define FLG_OF1_OVMACHCAP 0x0800000000 /* override CA_SUNW_MACH capability */ #define FLG_OF1_OVPLATCAP 0x1000000000 /* override CA_SUNW_PLAT capability */ #define FLG_OF1_OVIDCAP 0x2000000000 /* override CA_SUNW_ID capability */ #define FLG_OF1_OVHWCAP3 0x4000000000 /* override CA_SUNW_HW_3 capabilities */ /* * Guidance flags. The flags with the FLG_OFG_NO_ prefix are used to suppress * messages for a given category, and use the lower 28 bits of the word, * The upper nibble is reserved for other guidance status. */ #define FLG_OFG_ENABLE 0x10000000 /* -z guidance option active */ #define FLG_OFG_ISSUED 0x20000000 /* -z guidance message issued */ #define FLG_OFG_NO_ALL 0x0fffffff /* disable all guidance */ #define FLG_OFG_NO_DEFS 0x00000001 /* specify all dependencies */ #define FLG_OFG_NO_DB 0x00000002 /* use direct bindings */ #define FLG_OFG_NO_LAZY 0x00000004 /* be explicit about lazyload */ #define FLG_OFG_NO_MF 0x00000008 /* use v2 mapfile syntax */ #define FLG_OFG_NO_TEXT 0x00000010 /* verify pure text segment */ #define FLG_OFG_NO_UNUSED 0x00000020 /* remove unused dependency */ #define FLG_OFG_NO_ASSERTS 0x00000040 /* suggest mapfile assertions */ /* * Test to see if a guidance should be given for a given category * or not. _no_flag is one of the FLG_OFG_NO_xxx flags. Returns TRUE * if the guidance should be issued, and FALSE to remain silent. */ #define OFL_GUIDANCE(_ofl, _no_flag) (((_ofl)->ofl_guideflags & \ (FLG_OFG_ENABLE | (_no_flag))) == FLG_OFG_ENABLE) /* * Test to see if the output file would allow the presence of * a .dynsym section. */ #define OFL_ALLOW_DYNSYM(_ofl) (((_ofl)->ofl_flags & \ (FLG_OF_DYNAMIC | FLG_OF_RELOBJ)) == FLG_OF_DYNAMIC) /* * Test to see if the output file would allow the presence of * a .SUNW_ldynsym section. The requirements are that a .dynsym * is allowed, and -znoldynsym has not been specified. Note that * even if the answer is True (1), we will only generate one if there * are local symbols that require it. */ #define OFL_ALLOW_LDYNSYM(_ofl) (((_ofl)->ofl_flags & \ (FLG_OF_DYNAMIC | FLG_OF_RELOBJ | FLG_OF_NOLDYNSYM)) == FLG_OF_DYNAMIC) /* * Test to see if relocation processing should be done. This is normally * true, but can be disabled via the '-z noreloc' option. Note that * relocatable objects are still relocated even if '-z noreloc' is present. */ #define OFL_DO_RELOC(_ofl) (((_ofl)->ofl_flags & FLG_OF_RELOBJ) || \ !((_ofl)->ofl_dtflags_1 & DF_1_NORELOC)) /* * Determine whether a static executable is being built. */ #define OFL_IS_STATIC_EXEC(_ofl) (((_ofl)->ofl_flags & \ (FLG_OF_STATIC | FLG_OF_EXEC)) == (FLG_OF_STATIC | FLG_OF_EXEC)) /* * Determine whether a static object is being built. This macro is used * to select the appropriate string table, and symbol table that other * sections need to reference. */ #define OFL_IS_STATIC_OBJ(_ofl) ((_ofl)->ofl_flags & \ (FLG_OF_RELOBJ | FLG_OF_STATIC)) /* * Macros for counting symbol table entries. These are used to size symbol * tables and associated sections (.syminfo, SUNW_capinfo, .hash, etc.) and * set required sh_info entries (the offset to the first global symbol). */ #define SYMTAB_LOC_CNT(_ofl) /* local .symtab entries */ \ (2 + /* NULL and STT_FILE */ \ (_ofl)->ofl_shdrcnt + /* section symbol */ \ (_ofl)->ofl_caploclcnt + /* local capabilities */ \ (_ofl)->ofl_scopecnt + /* scoped symbols */ \ (_ofl)->ofl_locscnt) /* standard locals */ #define SYMTAB_ALL_CNT(_ofl) /* all .symtab entries */ \ (SYMTAB_LOC_CNT(_ofl) + /* .symtab locals */ \ (_ofl)->ofl_globcnt) /* standard globals */ #define DYNSYM_LOC_CNT(_ofl) /* local .dynsym entries */ \ (1 + /* NULL */ \ (_ofl)->ofl_dynshdrcnt + /* section symbols */ \ (_ofl)->ofl_caploclcnt + /* local capabilities */ \ (_ofl)->ofl_lregsymcnt) /* local register symbols */ #define DYNSYM_ALL_CNT(_ofl) /* all .dynsym entries */ \ (DYNSYM_LOC_CNT(_ofl) + /* .dynsym locals */ \ (_ofl)->ofl_globcnt) /* standard globals */ /* * Define a move descriptor used within relocation structures. */ typedef struct { Move *mr_move; Sym_desc *mr_sym; } Mv_reloc; /* * Relocation (active & output) processing structure - transparent to common * code. There can be millions of these structures in a large link, so it * is important to keep it small. You should only add new items to Rel_desc * if they are critical, apply to most relocations, and cannot be easily * computed from the other information. * * Items that can be derived should be implemented as a function that accepts * a Rel_desc argument, and returns the desired data. ld_reloc_sym_name() is * an example of this. * * Lesser used relocation data is kept in an auxiliary block, Rel_aux, * that is only allocated as necessary. In exchange for adding one pointer * of overhead to Rel_desc (rel_aux), most relocations are reduced in size * by the size of Rel_aux. This strategy relies on the data in Rel_aux * being rarely needed --- otherwise it will backfire badly. * * Note that rel_raddend is primarily only of interest to RELA relocations, * and is set to 0 for REL. However, there is an exception: If FLG_REL_NADDEND * is set, then rel_raddend contains a replacement value for the implicit * addend found in the relocation target. * * Fields should be ordered from largest to smallest, to minimize packing * holes in the struct layout. */ struct rel_desc { Is_desc *rel_isdesc; /* input section reloc is against */ Sym_desc *rel_sym; /* sym relocation is against */ Rel_aux *rel_aux; /* NULL, or auxiliary data */ Xword rel_roffset; /* relocation offset */ Sxword rel_raddend; /* addend from input relocation */ Word rel_flags; /* misc. flags for relocations */ Word rel_rtype; /* relocation type */ }; /* * Data that would be kept in Rel_desc if the size of that structure was * not an issue. This auxiliary block is only allocated as needed, * and must only contain rarely needed items. The goal is for the vast * majority of Rel_desc structs to not have an auxiliary block. * * When a Rel_desc does not have an auxiliary block, a default value * is assumed for each auxiliary item: * * - ra_osdesc: * Output section to which relocation applies. The default * value for this is the output section associated with the * input section (rel_isdesc->is_osdesc), or NULL if there * is no associated input section. * * - ra_usym: * If the symbol associated with a relocation is part of a weak/strong * pair, then ra_usym contains the strong symbol and rel_sym the weak. * Otherwise, the default value is the same value as rel_sym. * * - ra_move: * Move table data. The default value is NULL. * * - ra_typedata: * ELF_R_TYPE_DATA(info). This value applies only to a small * subset of 64-bit sparc relocations, and is otherwise 0. The * default value is 0. * * If any value in Rel_aux is non-default, then an auxiliary block is * necessary, and each field contains its actual value. If all the auxiliary * values are default, no Rel_aux is needed, and the RELAUX_GET_xxx() * macros below are able to supply the proper default. * * To set a Rel_aux value, use the ld_reloc_set_aux_XXX() functions. * These functions are written to avoid unnecessary auxiliary allocations, * and know the rules for each item. */ struct rel_aux { Os_desc *ra_osdesc; /* output section reloc is against */ Sym_desc *ra_usym; /* strong sym if this is a weak pair */ Mv_reloc *ra_move; /* move table information */ Word ra_typedata; /* ELF_R_TYPE_DATA(info) */ }; /* * Test a given auxiliary value to determine if it has the default value * for that item, as described above. If all the auxiliary items have * their default values, no auxiliary place is necessary to represent them. * If any one of them is non-default, the auxiliary block is needed. */ #define RELAUX_ISDEFAULT_MOVE(_rdesc, _mv) (_mv == NULL) #define RELAUX_ISDEFAULT_USYM(_rdesc, _usym) ((_rdesc)->rel_sym == _usym) #define RELAUX_ISDEFAULT_OSDESC(_rdesc, _osdesc) \ ((((_rdesc)->rel_isdesc == NULL) && (_osdesc == NULL)) || \ ((_rdesc)->rel_isdesc && ((_rdesc)->rel_isdesc->is_osdesc == _osdesc))) #define RELAUX_ISDEFAULT_TYPEDATA(_rdesc, _typedata) (_typedata == 0) /* * Retrieve the value of an auxiliary relocation item, preserving the illusion * that every relocation descriptor has an auxiliary block attached. The * real implementation is that an auxiliary block is only present if one or * more auxiliary items have non-default values. These macros return the true * value if an auxiliary block is present, and the default value for the * item otherwise. */ #define RELAUX_GET_MOVE(_rdesc) \ ((_rdesc)->rel_aux ? (_rdesc)->rel_aux->ra_move : NULL) #define RELAUX_GET_USYM(_rdesc) \ ((_rdesc)->rel_aux ? (_rdesc)->rel_aux->ra_usym : (_rdesc)->rel_sym) #define RELAUX_GET_OSDESC(_rdesc) \ ((_rdesc)->rel_aux ? (_rdesc)->rel_aux->ra_osdesc : \ ((_rdesc)->rel_isdesc ? (_rdesc)->rel_isdesc->is_osdesc : NULL)) #define RELAUX_GET_TYPEDATA(_rdesc) \ ((_rdesc)->rel_aux ? (_rdesc)->rel_aux->ra_typedata : 0) /* * common flags used on the Rel_desc structure (defined in machrel.h). */ #define FLG_REL_GOT 0x00000001 /* relocation against GOT */ #define FLG_REL_PLT 0x00000002 /* relocation against PLT */ #define FLG_REL_BSS 0x00000004 /* relocation against BSS */ #define FLG_REL_LOAD 0x00000008 /* section loadable */ #define FLG_REL_SCNNDX 0x00000010 /* use section index for symbol ndx */ #define FLG_REL_CLVAL 0x00000020 /* clear VALUE for active relocation */ #define FLG_REL_ADVAL 0x00000040 /* add VALUE for output relocation, */ /* only relevant to SPARC and */ /* R_SPARC_RELATIVE */ #define FLG_REL_GOTCL 0x00000080 /* clear the GOT entry. This is */ /* relevant to RELA relocations, */ /* not REL (i386) relocations */ #define FLG_REL_MOVETAB 0x00000100 /* Relocation against .SUNW_move */ /* adjustments required before */ /* actual relocation */ #define FLG_REL_NOINFO 0x00000200 /* Relocation comes from a section */ /* with a null sh_info field */ #define FLG_REL_REG 0x00000400 /* Relocation target is reg sym */ #define FLG_REL_FPTR 0x00000800 /* relocation against func. desc. */ #define FLG_REL_RFPTR1 0x00001000 /* Relative relocation against */ /* 1st part of FD */ #define FLG_REL_RFPTR2 0x00002000 /* Relative relocation against */ /* 2nd part of FD */ #define FLG_REL_DISP 0x00004000 /* *disp* relocation */ #define FLG_REL_STLS 0x00008000 /* IE TLS reference to */ /* static TLS GOT index */ #define FLG_REL_DTLS 0x00010000 /* GD TLS reference relative to */ /* dynamic TLS GOT index */ #define FLG_REL_MTLS 0x00020000 /* LD TLS reference against GOT */ #define FLG_REL_STTLS 0x00040000 /* LE TLS reference directly */ /* to static tls index */ #define FLG_REL_TLSFIX 0x00080000 /* relocation points to TLS instr. */ /* which needs updating */ #define FLG_REL_RELA 0x00100000 /* descriptor captures a Rela */ #define FLG_REL_GOTFIX 0x00200000 /* relocation points to GOTOP instr. */ /* which needs updating */ #define FLG_REL_NADDEND 0x00400000 /* Replace implicit addend in dest */ /* with value in rel_raddend */ /* Relevant to REL (i386) */ /* relocations, not to RELA. */ /* * We often need the name of the symbol contained in a relocation descriptor * for diagnostic or error output. This is usually the symbol name, but * we substitute a constructed name in some cases. Hence, the name is * generated on the fly by a private function within libld. This is the * prototype for that function. */ typedef const char *(* rel_desc_sname_func_t)(Rel_desc *); /* * Header for a relocation descriptor cache buffer. */ struct rel_cachebuf { Rel_desc *rc_end; Rel_desc *rc_free; Rel_desc rc_arr[1]; }; /* * Header for a relocation auxiliary descriptor cache buffer. */ struct rel_aux_cachebuf { Rel_aux *rac_end; Rel_aux *rac_free; Rel_aux rac_arr[1]; }; /* * Convenience macro for traversing every relocation descriptor found within * a given relocation cache, transparently handling the cache buffers and * skipping any unallocated descriptors within the buffers. * * entry: * _rel_cache - Relocate descriptor cache (Rel_cache) to traverse * _idx - Aliste index variable for use by the macro * _rcbp - Cache buffer pointer, for use by the macro * _orsp - Rel_desc pointer, which will take on the value of a different * relocation descriptor in the cache in each iteration. * * The caller must not assign new values to _idx, _rcbp, or _orsp within * the scope of REL_CACHE_TRAVERSE. */ #define REL_CACHE_TRAVERSE(_rel_cache, _idx, _rcbp, _orsp) \ for (APLIST_TRAVERSE((_rel_cache)->rc_list, _idx, _rcbp)) \ for (_orsp = _rcbp->rc_arr; _orsp < _rcbp->rc_free; _orsp++) /* * Symbol value descriptor. For relocatable objects, each symbols value is * its offset within its associated section. Therefore, to uniquely define * each symbol within a relocatable object, record and sort the sh_offset and * symbol value. This information is used to search for displacement * relocations as part of copy relocation validation. */ typedef struct { Addr ssv_value; Sym_desc *ssv_sdp; } Ssv_desc; /* * Input file processing structures. */ struct ifl_desc { /* input file descriptor */ const char *ifl_name; /* full file name */ const char *ifl_soname; /* shared object name */ dev_t ifl_stdev; /* device id and inode number for .so */ ino_t ifl_stino; /* multiple inclusion checks */ Ehdr *ifl_ehdr; /* elf header describing this file */ Elf *ifl_elf; /* elf descriptor for this file */ Sym_desc **ifl_oldndx; /* original symbol table indices */ Sym_desc *ifl_locs; /* symbol desc version of locals */ Ssv_desc *ifl_sortsyms; /* sorted list of symbols by value */ Word ifl_locscnt; /* no. of local symbols to process */ Word ifl_symscnt; /* total no. of symbols to process */ Word ifl_sortcnt; /* no. of sorted symbols to process */ Word ifl_shnum; /* number of sections in file */ Word ifl_shstrndx; /* index to .shstrtab */ Word ifl_vercnt; /* number of versions in file */ Half ifl_neededndx; /* index to NEEDED in .dyn section */ Word ifl_flags; /* explicit/implicit reference */ Is_desc **ifl_isdesc; /* isdesc[scn ndx] = Is_desc ptr */ Sdf_desc *ifl_sdfdesc; /* control definition */ Versym *ifl_versym; /* version symbol table array */ Ver_index *ifl_verndx; /* verndx[ver ndx] = Ver_index */ APlist *ifl_verdesc; /* version descriptor list */ APlist *ifl_relsect; /* relocation section list */ Alist *ifl_groups; /* SHT_GROUP section list */ Cap_desc *ifl_caps; /* capabilities descriptor */ }; #define FLG_IF_CMDLINE 0x00000001 /* full filename specified from the */ /* command line (no -l) */ #define FLG_IF_NEEDED 0x00000002 /* shared object should be recorded */ #define FLG_IF_DIRECT 0x00000004 /* establish direct bindings to this */ /* object */ #define FLG_IF_EXTRACT 0x00000008 /* file extracted from an archive */ #define FLG_IF_VERNEED 0x00000010 /* version dependency information is */ /* required */ #define FLG_IF_DEPREQD 0x00000020 /* dependency is required to satisfy */ /* symbol references */ #define FLG_IF_NEEDSTR 0x00000040 /* dependency specified by -Nn */ /* flag */ #define FLG_IF_IGNORE 0x00000080 /* ignore unused dependencies */ #define FLG_IF_NODIRECT 0x00000100 /* object contains symbols that */ /* cannot be directly bound to */ #define FLG_IF_LAZYLD 0x00000200 /* dependency should be lazy loaded */ #define FLG_IF_GRPPRM 0x00000400 /* dependency establishes a group */ #define FLG_IF_DISPPEND 0x00000800 /* displacement relocation done */ /* in the ld time. */ #define FLG_IF_DISPDONE 0x00001000 /* displacement relocation done */ /* at the run time */ #define FLG_IF_MAPFILE 0x00002000 /* file is a mapfile */ #define FLG_IF_HSTRTAB 0x00004000 /* file has a string section */ #define FLG_IF_FILEREF 0x00008000 /* file contains a section which */ /* is included in the output */ /* allocatable image */ #define FLG_IF_GNUVER 0x00010000 /* file used GNU-style versioning */ #define FLG_IF_ORDERED 0x00020000 /* ordered section processing */ /* required */ #define FLG_IF_OTOSCAP 0x00040000 /* convert object capabilities to */ /* symbol capabilities */ #define FLG_IF_DEFERRED 0x00080000 /* dependency is deferred */ #define FLG_IF_RTLDINF 0x00100000 /* dependency has DT_SUNW_RTLTINF set */ #define FLG_IF_GROUPS 0x00200000 /* input file has groups to process */ /* * Symbol states that require the generation of a DT_POSFLAG_1 .dynamic entry. */ #define MSK_IF_POSFLAG1 (FLG_IF_LAZYLD | FLG_IF_GRPPRM | FLG_IF_DEFERRED) /* * Symbol states that require an associated Syminfo entry. */ #define MSK_IF_SYMINFO (FLG_IF_LAZYLD | FLG_IF_DIRECT | FLG_IF_DEFERRED) struct is_desc { /* input section descriptor */ const char *is_name; /* original section name */ const char *is_sym_name; /* NULL, or name string to use for */ /* related STT_SECTION symbols */ Shdr *is_shdr; /* the elf section header */ Ifl_desc *is_file; /* infile desc for this section */ Os_desc *is_osdesc; /* new output section for this */ /* input section */ Elf_Data *is_indata; /* input sections raw data */ Is_desc *is_symshndx; /* related SHT_SYM_SHNDX section */ Is_desc *is_comdatkeep; /* If COMDAT section is discarded, */ /* this is section that was kept */ Word is_scnndx; /* original section index in file */ Word is_ordndx; /* index for section. Used to decide */ /* where to insert section when */ /* reordering sections */ Word is_keyident; /* key for SHF_{ORDERED|LINK_ORDER} */ /* processing and ident used for */ /* placing/ordering sections */ Word is_flags; /* Various flags */ }; #define FLG_IS_ORDERED 0x0001 /* this is a SHF_ORDERED section */ #define FLG_IS_KEY 0x0002 /* section requires sort keys */ #define FLG_IS_DISCARD 0x0004 /* section is to be discarded */ #define FLG_IS_RELUPD 0x0008 /* symbol defined here may have moved */ #define FLG_IS_SECTREF 0x0010 /* section has been referenced */ #define FLG_IS_GDATADEF 0x0020 /* section contains global data sym */ #define FLG_IS_EXTERNAL 0x0040 /* isp from a user file */ #define FLG_IS_INSTRMRG 0x0080 /* Usable SHF_MERGE|SHF_STRINGS sec */ #define FLG_IS_GNSTRMRG 0x0100 /* Generated mergeable string section */ #define FLG_IS_PLACE 0x0400 /* section requires to be placed */ #define FLG_IS_COMDAT 0x0800 /* section is COMDAT */ #define FLG_IS_EHFRAME 0x1000 /* section is .eh_frame */ /* * Output sections contain lists of input sections that are assigned to them. * These items fall into 4 categories: * BEFORE - Ordered sections that specify SHN_BEFORE, in input order. * ORDERED - Ordered sections that are sorted using unsorted sections * as the sort key. * DEFAULT - Sections that are placed into the output section * in input order. * AFTER - Ordered sections that specify SHN_AFTER, in input order. */ #define OS_ISD_BEFORE 0 #define OS_ISD_ORDERED 1 #define OS_ISD_DEFAULT 2 #define OS_ISD_AFTER 3 #define OS_ISD_NUM 4 typedef APlist *os_isdecs_arr[OS_ISD_NUM]; /* * Convenience macro for traversing every input section associated * with a given output section. The primary benefit of this macro * is that it preserves a precious level of code indentation in the * code that uses it. */ #define OS_ISDESCS_TRAVERSE(_list_idx, _osp, _idx, _isp) \ for (_list_idx = 0; _list_idx < OS_ISD_NUM; _list_idx++) \ for (APLIST_TRAVERSE(_osp->os_isdescs[_list_idx], _idx, _isp)) /* * Map file and output file processing structures */ struct os_desc { /* Output section descriptor */ const char *os_name; /* the section name */ Elf_Scn *os_scn; /* the elf section descriptor */ Shdr *os_shdr; /* the elf section header */ Os_desc *os_relosdesc; /* the output relocation section */ APlist *os_relisdescs; /* reloc input section descriptors */ /* for this output section */ os_isdecs_arr os_isdescs; /* lists of input sections in output */ APlist *os_mstrisdescs; /* FLG_IS_INSTRMRG input sections */ Sg_desc *os_sgdesc; /* segment os_desc is placed on */ Elf_Data *os_outdata; /* output sections raw data */ avl_tree_t *os_comdats; /* AVL tree of COMDAT input sections */ /* associated to output section */ Word os_identndx; /* section identifier for input */ /* section processing, followed */ /* by section symbol index */ Word os_ordndx; /* index for section. Used to decide */ /* where to insert section when */ /* reordering sections */ Xword os_szoutrels; /* size of output relocation section */ uint_t os_namehash; /* hash on section name */ uchar_t os_flags; /* various flags */ APlist *os_mstrsyms; /* symbols affected by string merge */ APlist *os_mstrrels; /* section relocs affected by... */ Str_tbl *os_mstrtab; /* merged string table */ Os_desc *os_hashnext; /* next hashed */ }; /* * Hash of output section descriptors, by namehash. */ typedef struct os_desc_hash { Os_desc **osh_hashtab; /* hash table itself */ size_t osh_size; /* number of elements in hash table */ } os_desc_hash_t; #define FLG_OS_KEY 0x01 /* section requires sort keys */ #define FLG_OS_OUTREL 0x02 /* output rel against this section */ #define FLG_OS_SECTREF 0x04 /* isps are not affected by -zignore */ #define FLG_OS_EHFRAME 0x08 /* section is .eh_frame */ /* * The sg_id field of the segment descriptor is used to establish the default * order for program headers and segments in the output object. Segments are * ordered according to the following SGID values that classify them based on * their attributes. The initial set of built in segments are in this order, * and new mapfile defined segments are inserted into these groups. Within a * given SGID group, the position of new segments depends on the syntax * version of the mapfile that creates them. Version 1 (original sysv) * mapfiles place the new segment at the head of their group (reverse creation * order). The newer syntax places them at the end, following the others * (creation order). * * Note that any new segments must always be added after PT_PHDR and * PT_INTERP (refer Generic ABI, Page 5-4). */ #define SGID_PHDR 0 /* PT_PHDR */ #define SGID_INTERP 1 /* PT_INTERP */ #define SGID_SUNWCAP 2 /* PT_SUNWCAP */ #define SGID_TEXT 3 /* PT_LOAD */ #define SGID_DATA 4 /* PT_LOAD */ #define SGID_BSS 5 /* PT_LOAD */ #if defined(_ELF64) #define SGID_LRODATA 6 /* PT_LOAD (amd64-only) */ #define SGID_LDATA 7 /* PT_LOAD (amd64-only) */ #endif #define SGID_TEXT_EMPTY 8 /* PT_LOAD, reserved (?E in version 1 syntax) */ #define SGID_NULL_EMPTY 9 /* PT_NULL, reserved (?E in version 1 syntax) */ #define SGID_DYN 10 /* PT_DYNAMIC */ #define SGID_DTRACE 11 /* PT_SUNWDTRACE */ #define SGID_TLS 12 /* PT_TLS */ #define SGID_UNWIND 13 /* PT_SUNW_UNWIND */ #define SGID_SUNWSTACK 14 /* PT_SUNWSTACK */ #define SGID_NOTE 15 /* PT_NOTE */ #define SGID_NULL 16 /* PT_NULL, mapfile defined empty phdr slots */ /* for use by post processors */ #define SGID_EXTRA 17 /* PT_NULL (final catchall) */ typedef Half sg_flags_t; struct sg_desc { /* output segment descriptor */ Word sg_id; /* segment identifier (for sorting) */ Phdr sg_phdr; /* segment header for output file */ const char *sg_name; /* segment name for PT_LOAD, PT_NOTE, */ /* and PT_NULL, otherwise NULL */ Xword sg_round; /* data rounding required (mapfile) */ Xword sg_length; /* maximum segment length; if 0 */ /* segment is not specified */ APlist *sg_osdescs; /* list of output section descriptors */ APlist *sg_is_order; /* list of entry criteria */ /* giving input section order */ Alist *sg_os_order; /* list specifying output section */ /* ordering for the segment */ sg_flags_t sg_flags; APlist *sg_sizesym; /* size symbols for this segment */ Xword sg_align; /* LCM of sh_addralign */ Elf_Scn *sg_fscn; /* the SCN of the first section. */ avl_node_t sg_avlnode; /* AVL book-keeping */ os_desc_hash_t *sg_hashtab; /* hash table of output descriptors */ }; #define FLG_SG_P_VADDR 0x0001 /* p_vaddr segment attribute set */ #define FLG_SG_P_PADDR 0x0002 /* p_paddr segment attribute set */ #define FLG_SG_LENGTH 0x0004 /* length segment attribute set */ #define FLG_SG_P_ALIGN 0x0008 /* p_align segment attribute set */ #define FLG_SG_ROUND 0x0010 /* round segment attribute set */ #define FLG_SG_P_FLAGS 0x0020 /* p_flags segment attribute set */ #define FLG_SG_P_TYPE 0x0040 /* p_type segment attribute set */ #define FLG_SG_IS_ORDER 0x0080 /* input section ordering is required */ /* for this segment. */ #define FLG_SG_NOHDR 0x0100 /* don't map ELF or phdrs into */ /* this segment */ #define FLG_SG_EMPTY 0x0200 /* an empty segment specification */ /* no input sections will be */ /* associated to this section */ #define FLG_SG_KEY 0x0400 /* segment requires sort keys */ #define FLG_SG_NODISABLE 0x0800 /* FLG_SG_DISABLED is not allowed on */ /* this segment */ #define FLG_SG_DISABLED 0x1000 /* this segment is disabled */ #define FLG_SG_PHREQ 0x2000 /* this segment requires a program */ /* header */ #define FLG_SG_ORDERED 0x4000 /* SEGMENT_ORDER segment */ struct sec_order { const char *sco_secname; /* section name to be ordered */ Half sco_flags; }; #define FLG_SGO_USED 0x0001 /* was ordering used? */ typedef Half ec_flags_t; struct ent_desc { /* input section entrance criteria */ const char *ec_name; /* entrace criteria name, or NULL */ Alist *ec_files; /* files from which to accept */ /* sections */ const char *ec_is_name; /* input section name to match */ /* (NULL if none) */ Word ec_type; /* section type */ Word ec_attrmask; /* section attribute mask (AWX) */ Word ec_attrbits; /* sections attribute bits */ Sg_desc *ec_segment; /* output segment to enter if matched */ Word ec_ordndx; /* index to determine where section */ /* meeting this criteria should */ /* inserted. Used for reordering */ /* of sections. */ ec_flags_t ec_flags; avl_node_t ec_avlnode; /* AVL book-keeping */ }; #define FLG_EC_BUILTIN 0x0001 /* built in descriptor */ #define FLG_EC_USED 0x0002 /* entrance criteria met? */ #define FLG_EC_CATCHALL 0x0004 /* Catches any section */ /* * Ent_desc_file is the type of element maintained in the ec_files Alist * of an entrance criteria descriptor. Each item maintains one file * path, and a set of flags that specify the type of comparison it implies, * and other information about it. The comparison type is maintained in * the bottom byte of the flags. */ #define TYP_ECF_MASK 0x00ff /* Comparison type mask */ #define TYP_ECF_PATH 0 /* Compare to file path */ #define TYP_ECF_BASENAME 1 /* Compare to file basename */ #define TYP_ECF_OBJNAME 2 /* Compare to regular file basename, */ /* or to archive member name */ #define TYP_ECF_NUM 3 #define FLG_ECF_ARMEMBER 0x0100 /* name includes archive member */ typedef struct { Word edf_flags; /* Type of comparison */ const char *edf_name; /* String to compare to */ size_t edf_name_len; /* strlen(edf_name) */ } Ent_desc_file; /* * One structure is allocated for a move entry, and associated to the symbol * against which a move is targeted. */ typedef struct { Move *md_move; /* original Move entry */ Xword md_start; /* start position */ Xword md_len; /* length of initialization */ Word md_oidx; /* output Move entry index */ } Mv_desc; #define SYM_ASSERT_SIZE 0x01 #define SYM_ASSERT_BIND 0x02 #define SYM_ASSERT_TYPE 0x04 #define SYM_ASSERT_BITS 0x08 #define SYM_ASSERT_ALIAS 0x10 typedef struct { Sym_desc *ass_sdp; char *ass_file; Lineno ass_lineno; uchar_t ass_type; uchar_t ass_bind; Lword ass_size; Boolean ass_bits; const char *ass_alias; /* Assertions explicitly enabled by user */ uint_t ass_enabled; } Ass_desc; /* * Symbol descriptor. */ typedef Lword sd_flag_t; struct sym_desc { Alist *sd_GOTndxs; /* list of associated GOT entries */ Sym *sd_sym; /* pointer to symbol table entry */ Sym *sd_osym; /* copy of the original symbol entry */ /* used only for local partial */ Alist *sd_move; /* move information associated with a */ /* partially initialized symbol */ const char *sd_name; /* symbols name */ Ifl_desc *sd_file; /* file where symbol is taken */ Is_desc *sd_isc; /* input section of symbol definition */ Sym_aux *sd_aux; /* auxiliary global symbol info. */ Word sd_symndx; /* index in output symbol table */ Word sd_shndx; /* sect. index sym is associated w/ */ sd_flag_t sd_flags; /* state flags */ Half sd_ref; /* reference definition of symbol */ Ass_desc *sd_ass; /* pointer back to symbol assertions */ }; /* * The auxiliary symbol descriptor contains the additional information (beyond * the symbol descriptor) required to process global symbols. These symbols are * accessed via an internal symbol hash table where locality of reference is * important for performance. */ struct sym_aux { APlist *sa_dfiles; /* files where symbol is defined */ Sym sa_sym; /* copy of symtab entry */ const char *sa_vfile; /* first unavailable definition */ const char *sa_rfile; /* file with first symbol referenced */ Word sa_hash; /* the pure hash value of symbol */ Word sa_PLTndx; /* index into PLT for symbol */ Word sa_PLTGOTndx; /* GOT entry indx for PLT indirection */ Word sa_linkndx; /* index of associated symbol from */ /* ET_DYN file */ Half sa_symspec; /* special symbol ids */ Half sa_overndx; /* output file versioning index */ Half sa_dverndx; /* dependency versioning index */ Os_desc *sa_boundsec; /* output section of SECBOUND_ syms */ }; /* * Nodes used to track symbols in the global AVL symbol dictionary. */ struct sym_avlnode { avl_node_t sav_node; /* AVL node */ Word sav_hash; /* symbol hash value */ const char *sav_name; /* symbol name */ Sym_desc *sav_sdp; /* symbol descriptor */ }; /* * These are the ids for processing of `Special symbols'. They are used * to set the sym->sd_aux->sa_symspec field. */ #define SDAUX_ID_ETEXT 1 /* etext && _etext symbol */ #define SDAUX_ID_EDATA 2 /* edata && _edata symbol */ #define SDAUX_ID_END 3 /* end, _end, && _END_ symbol */ #define SDAUX_ID_DYN 4 /* DYNAMIC && _DYNAMIC symbol */ #define SDAUX_ID_PLT 5 /* _PROCEDURE_LINKAGE_TABLE_ symbol */ #define SDAUX_ID_GOT 6 /* _GLOBAL_OFFSET_TABLE_ symbol */ #define SDAUX_ID_START 7 /* START_ && _START_ symbol */ #define SDAUX_ID_SECBOUND_START 8 /* __start_<section> symbols */ #define SDAUX_ID_SECBOUND_STOP 9 /* __stop_<section> symbols */ /* * Flags for sym_desc.sd_flags */ #define FLG_SY_MVTOCOMM 0x00000001 /* assign symbol to common (.bss) */ /* this is a result of a */ /* copy reloc against sym */ #define FLG_SY_GLOBREF 0x00000002 /* a global reference has been seen */ #define FLG_SY_WEAKDEF 0x00000004 /* a weak definition has been used */ #define FLG_SY_CLEAN 0x00000008 /* `Sym' entry points to original */ /* input file (read-only). */ #define FLG_SY_UPREQD 0x00000010 /* symbol value update is required, */ /* either it's used as an entry */ /* point or for relocation, but */ /* it must be updated even if */ /* the -s flag is in effect */ #define FLG_SY_NOTAVAIL 0x00000020 /* symbol is not available to the */ /* application either because it */ /* originates from an implicitly */ /* referenced shared object, or */ /* because it is not part of a */ /* specified version. */ #define FLG_SY_REDUCED 0x00000040 /* a global is reduced to local */ #define FLG_SY_VERSPROM 0x00000080 /* version definition has been */ /* promoted to output file */ #define FLG_SY_PROT 0x00000100 /* stv_protected visibility seen */ #define FLG_SY_MAPREF 0x00000200 /* symbol reference generated by user */ /* from mapfile */ #define FLG_SY_REFRSD 0x00000400 /* symbols sd_ref has been raised */ /* due to a copy-relocs */ /* weak-strong pairing */ #define FLG_SY_INTPOSE 0x00000800 /* symbol defines an interposer */ #define FLG_SY_INVALID 0x00001000 /* unwanted/erroneous symbol */ #define FLG_SY_SMGOT 0x00002000 /* small got index assigned to symbol */ /* sparc only */ #define FLG_SY_PARENT 0x00004000 /* symbol to be found in parent */ /* only used with direct bindings */ #define FLG_SY_LAZYLD 0x00008000 /* symbol to cause lazyloading of */ /* parent object */ #define FLG_SY_ISDISC 0x00010000 /* symbol is a member of a DISCARDED */ /* section (COMDAT) */ #define FLG_SY_PAREXPN 0x00020000 /* partially init. symbol to be */ /* expanded */ #define FLG_SY_PLTPAD 0x00040000 /* pltpadding has been allocated for */ /* this symbol */ #define FLG_SY_REGSYM 0x00080000 /* REGISTER symbol (sparc only) */ #define FLG_SY_SOFOUND 0x00100000 /* compared against an SO definition */ #define FLG_SY_EXTERN 0x00200000 /* symbol is external, allows -zdefs */ /* error suppression */ #define FLG_SY_MAPUSED 0x00400000 /* mapfile symbol used (occurred */ /* within a relocatable object) */ #define FLG_SY_COMMEXP 0x00800000 /* COMMON symbol which has been */ /* allocated */ #define FLG_SY_CMDREF 0x01000000 /* symbol was referenced from the */ /* command line. (ld -u <>, */ /* ld -zrtldinfo=<>, ...) */ #define FLG_SY_SPECSEC 0x02000000 /* section index is reserved value */ /* ABS, COMMON, ... */ #define FLG_SY_TENTSYM 0x04000000 /* tentative symbol */ #define FLG_SY_VISIBLE 0x08000000 /* symbols visibility determined */ #define FLG_SY_STDFLTR 0x10000000 /* symbol is a standard filter */ #define FLG_SY_AUXFLTR 0x20000000 /* symbol is an auxiliary filter */ #define FLG_SY_DYNSORT 0x40000000 /* req. in dyn[sym|tls]sort section */ #define FLG_SY_NODYNSORT 0x80000000 /* excluded from dyn[sym_tls]sort sec */ #define FLG_SY_DEFAULT 0x0000100000000 /* global symbol, default */ #define FLG_SY_SINGLE 0x0000200000000 /* global symbol, singleton defined */ #define FLG_SY_PROTECT 0x0000400000000 /* global symbol, protected defined */ #define FLG_SY_EXPORT 0x0000800000000 /* global symbol, exported defined */ #define MSK_SY_GLOBAL \ (FLG_SY_DEFAULT | FLG_SY_SINGLE | FLG_SY_PROTECT | FLG_SY_EXPORT) /* this mask indicates that the */ /* symbol has been explicitly */ /* defined within a mapfile */ /* definition, and is a candidate */ /* for versioning */ #define FLG_SY_HIDDEN 0x0001000000000 /* global symbol, reduce to local */ #define FLG_SY_ELIM 0x0002000000000 /* global symbol, eliminate */ #define FLG_SY_IGNORE 0x0004000000000 /* global symbol, ignored */ #define MSK_SY_LOCAL (FLG_SY_HIDDEN | FLG_SY_ELIM | FLG_SY_IGNORE) /* this mask allows all local state */ /* flags to be removed when the */ /* symbol is copy relocated */ #define FLG_SY_EXPDEF 0x0008000000000 /* symbol visibility defined */ /* explicitly */ #define MSK_SY_NOAUTO (FLG_SY_SINGLE | FLG_SY_EXPORT | FLG_SY_EXPDEF) /* this mask indicates that the */ /* symbol is not a candidate for */ /* auto-reduction/elimination */ #define FLG_SY_MAPFILE 0x0010000000000 /* symbol attribute defined in a */ /* mapfile */ #define FLG_SY_DIR 0x0020000000000 /* global symbol, direct bindings */ #define FLG_SY_NDIR 0x0040000000000 /* global symbol, nondirect bindings */ #define FLG_SY_OVERLAP 0x0080000000000 /* move entry overlap detected */ #define FLG_SY_CAP 0x0100000000000 /* symbol is associated with */ /* capabilities */ #define FLG_SY_DEFERRED 0x0200000000000 /* symbol should not be bound to */ /* during BIND_NOW relocations */ #define FLG_SY_MAPASSRT 0x0400000000000 /* Symbol has attribute assertions */ /* * A symbol can only be truly hidden if it is not a capabilities symbol. */ #define SYM_IS_HIDDEN(_sdp) \ (((_sdp)->sd_flags & (FLG_SY_HIDDEN | FLG_SY_CAP)) == FLG_SY_HIDDEN) /* * Create a mask for (sym.st_other & visibility) since the gABI does not yet * define a ELF*_ST_OTHER macro. */ #define MSK_SYM_VISIBILITY 0x7 /* * Structure to manage the shared object definition lists. There are two lists * that use this structure: * * - ofl_soneed; maintain the list of implicitly required dependencies * (ie. shared objects needed by other shared objects). These definitions * may include RPATH's required to locate the dependencies, and any * version requirements. * * - ofl_socntl; maintains the shared object control definitions. These are * provided by the user (via a mapfile) and are used to indicate any * version control requirements. */ struct sdf_desc { const char *sdf_name; /* the shared objects file name */ char *sdf_rpath; /* library search path DT_RPATH */ const char *sdf_rfile; /* referencing file for diagnostics */ Ifl_desc *sdf_file; /* the final input file descriptor */ Alist *sdf_vers; /* list of versions that are required */ /* from this object */ Alist *sdf_verneed; /* list of VERNEEDS to create for */ /* object via mapfile ADDVERS */ Word sdf_flags; }; #define FLG_SDF_SELECT 0x01 /* version control selection required */ #define FLG_SDF_VERIFY 0x02 /* version definition verification */ /* required */ #define FLG_SDF_ADDVER 0x04 /* add VERNEED references */ /* * Structure to manage shared object version usage requirements. */ struct sdv_desc { const char *sdv_name; /* version name */ const char *sdv_ref; /* versions reference */ Word sdv_flags; /* flags */ }; #define FLG_SDV_MATCHED 0x01 /* VERDEF found and matched */ /* * Structures to manage versioning information. Two versioning structures are * defined: * * - a version descriptor maintains a linked list of versions and their * associated dependencies. This is used to build the version definitions * for an image being created (see map_symbol), and to determine the * version dependency graph for any input files that are versioned. * * - a version index array contains each version of an input file that is * being processed. It informs us which versions are available for * binding, and is used to generate any version dependency information. */ struct ver_desc { const char *vd_name; /* version name */ Ifl_desc *vd_file; /* file that defined version */ Word vd_hash; /* hash value of name */ Half vd_ndx; /* coordinates with symbol index */ Half vd_flags; /* version information */ APlist *vd_deps; /* version dependencies */ Ver_desc *vd_ref; /* dependency's first reference */ }; struct ver_index { const char *vi_name; /* dependency version name */ Half vi_flags; /* communicates availability */ Half vi_overndx; /* index assigned to this version in */ /* output object Verneed section */ Ver_desc *vi_desc; /* cross reference to descriptor */ }; /* * Define any internal version descriptor flags ([vd|vi]_flags). Note that the * first byte is reserved for user visible flags (refer VER_FLG's in link.h). */ #define MSK_VER_USER 0x0f /* mask for user visible flags */ #define FLG_VER_AVAIL 0x10 /* version is available for binding */ #define FLG_VER_REFER 0x20 /* version has been referenced */ #define FLG_VER_CYCLIC 0x40 /* a member of cyclic dependency */ /* * isalist(1) descriptor - used to break an isalist string into its component * options. */ struct isa_opt { char *isa_name; /* individual isa option name */ size_t isa_namesz; /* and associated size */ }; struct isa_desc { char *isa_list; /* sysinfo(SI_ISALIST) list */ size_t isa_listsz; /* and associated size */ Isa_opt *isa_opt; /* table of individual isa options */ size_t isa_optno; /* and associated number */ }; /* * uname(2) descriptor - used to break a utsname structure into its component * options (at least those that we're interested in). */ struct uts_desc { char *uts_osname; /* operating system name */ size_t uts_osnamesz; /* and associated size */ char *uts_osrel; /* operating system release */ size_t uts_osrelsz; /* and associated size */ }; /* * SHT_GROUP descriptor - used to track group sections at the global * level to resolve conflicts and determine which to keep. */ struct group_desc { Is_desc *gd_isc; /* input section descriptor */ Is_desc *gd_oisc; /* overriding input section */ /* descriptor when discarded */ const char *gd_name; /* group name (signature symbol) */ Word *gd_data; /* data for group section */ size_t gd_cnt; /* number of entries in group data */ }; /* * Indexes into the ld_support_funcs[] table. */ typedef enum { LDS_VERSION = 0, /* Must be first and have value 0 */ LDS_INPUT_DONE, LDS_START, LDS_ATEXIT, LDS_OPEN, LDS_FILE, LDS_INSEC, LDS_SEC, LDS_NUM } Support_ndx; /* * Structure to manage archive member caching. Each archive has an archive * descriptor (Ar_desc) associated with it. This contains pointers to the * archive symbol table (obtained by elf_getarsym(3ELF)) and an auxiliary * structure (Ar_uax[]) that parallels this symbol table. The member element * of this auxiliary table indicates whether the archive member associated with * the symbol offset has already been extracted (AREXTRACTED) or partially * processed (refer process_member()). */ typedef struct ar_mem { Elf *am_elf; /* elf descriptor for this member */ const char *am_name; /* members name */ const char *am_path; /* path (ie. lib(foo.o)) */ Sym *am_syms; /* start of global symbols */ char *am_strs; /* associated string table start */ Xword am_symn; /* no. of global symbols */ } Ar_mem; typedef struct ar_aux { Sym_desc *au_syms; /* internal symbol descriptor */ Ar_mem *au_mem; /* associated member */ } Ar_aux; #define FLG_ARMEM_PROC (Ar_mem *)-1 typedef struct ar_desc { const char *ad_name; /* archive file name */ Elf *ad_elf; /* elf descriptor for the archive */ Elf_Arsym *ad_start; /* archive symbol table start */ Ar_aux *ad_aux; /* auxiliary symbol information */ dev_t ad_stdev; /* device id and inode number for */ ino_t ad_stino; /* multiple inclusion checks */ ofl_flag_t ad_flags; /* archive specific cmd line flags */ Boolean ad_allextract; /* archive has been allextract'ed */ } Ar_desc; /* * Define any archive descriptor flags. NOTE, make sure they do not clash with * any output file descriptor archive extraction flags, as these are saved in * the same entry (see MSK_OF1_ARCHIVE). */ #define FLG_ARD_EXTRACT 0x00010000 /* archive member has been extracted */ /* Mapfile versions supported by libld */ #define MFV_NONE 0 /* Not a valid version */ #define MFV_SYSV 1 /* Original System V syntax */ #define MFV_SOLARIS 2 /* Solaris mapfile syntax */ #define MFV_NUM 3 /* # of mapfile versions */ /* * Function Declarations. */ #if defined(_ELF64) #define ld_create_outfile ld64_create_outfile #define ld_ent_setup ld64_ent_setup #define ld_init_strings ld64_init_strings #define ld_init_target ld64_init_target #define ld_make_sections ld64_make_sections #define ld_main ld64_main #define ld_ofl_cleanup ld64_ofl_cleanup #define ld_process_mem ld64_process_mem #define ld_reloc_init ld64_reloc_init #define ld_reloc_process ld64_reloc_process #define ld_sym_validate ld64_sym_validate #define ld_update_outfile ld64_update_outfile #else #define ld_create_outfile ld32_create_outfile #define ld_ent_setup ld32_ent_setup #define ld_init_strings ld32_init_strings #define ld_init_target ld32_init_target #define ld_make_sections ld32_make_sections #define ld_main ld32_main #define ld_ofl_cleanup ld32_ofl_cleanup #define ld_process_mem ld32_process_mem #define ld_reloc_init ld32_reloc_init #define ld_reloc_process ld32_reloc_process #define ld_sym_validate ld32_sym_validate #define ld_update_outfile ld32_update_outfile #endif extern int ld_getopt(Lm_list *, int, int, char **); extern int ld32_main(int, char **, Half); extern int ld64_main(int, char **, Half); extern uintptr_t ld_create_outfile(Ofl_desc *); extern uintptr_t ld_ent_setup(Ofl_desc *, Xword); extern uintptr_t ld_init_strings(Ofl_desc *); extern int ld_init_target(Lm_list *, Half mach); extern uintptr_t ld_make_sections(Ofl_desc *); extern void ld_ofl_cleanup(Ofl_desc *); extern Ifl_desc *ld_process_mem(const char *, const char *, char *, size_t, Ofl_desc *, Rej_desc *); extern uintptr_t ld_reloc_init(Ofl_desc *); extern uintptr_t ld_reloc_process(Ofl_desc *); extern uintptr_t ld_sym_validate(Ofl_desc *); extern uintptr_t ld_update_outfile(Ofl_desc *); #ifdef __cplusplus } #endif #endif /* _LIBLD_H */
