123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840841842843844845846847848849850851852853854855856857858859860861862863864865866867868869870871872873874875876877878879880881882883884885886887888889890891892893894895896897898899900901902903904905906907908909910911912913914915916917918919920921922923924925926927928929930931932933934935936937938939940941942943944945946947948949950951952953954955956957958959960961962963964965966967968969970971972973974975976977978979980981982983984985986987988989990991992993994995996997998999100010011002100310041005100610071008100910101011101210131014101510161017101810191020102110221023102410251026102710281029103010311032103310341035103610371038103910401041104210431044104510461047104810491050105110521053105410551056105710581059106010611062106310641065106610671068106910701071107210731074107510761077107810791080108110821083108410851086108710881089109010911092109310941095109610971098109911001101110211031104110511061107110811091110111111121113111411151116111711181119112011211122112311241125112611271128112911301131113211331134113511361137113811391140114111421143114411451146114711481149115011511152115311541155115611571158115911601161116211631164116511661167116811691170117111721173117411751176117711781179118011811182118311841185118611871188118911901191119211931194119511961197119811991200120112021203120412051206120712081209121012111212121312141215121612171218121912201221122212231224122512261227122812291230123112321233123412351236123712381239124012411242124312441245124612471248124912501251125212531254125512561257125812591260126112621263126412651266126712681269127012711272127312741275127612771278127912801281128212831284128512861287128812891290129112921293129412951296129712981299130013011302130313041305130613071308130913101311131213131314131513161317131813191320132113221323132413251326132713281329133013311332133313341335133613371338133913401341134213431344134513461347134813491350135113521353135413551356135713581359136013611362136313641365136613671368136913701371137213731374137513761377137813791380138113821383138413851386138713881389139013911392139313941395139613971398139914001401140214031404140514061407140814091410141114121413141414151416141714181419142014211422142314241425142614271428142914301431143214331434143514361437143814391440144114421443144414451446144714481449145014511452145314541455145614571458145914601461146214631464146514661467146814691470147114721473147414751476147714781479148014811482148314841485148614871488148914901491149214931494149514961497149814991500150115021503150415051506150715081509151015111512151315141515151615171518151915201521152215231524152515261527152815291530153115321533153415351536153715381539154015411542154315441545154615471548154915501551155215531554155515561557155815591560156115621563156415651566156715681569157015711572157315741575157615771578157915801581158215831584158515861587158815891590159115921593159415951596159715981599160016011602160316041605160616071608160916101611161216131614161516161617161816191620162116221623162416251626162716281629163016311632163316341635163616371638163916401641164216431644164516461647164816491650165116521653165416551656165716581659166016611662166316641665166616671668166916701671167216731674167516761677167816791680168116821683168416851686168716881689169016911692169316941695169616971698169917001701170217031704170517061707170817091710171117121713171417151716171717181719172017211722172317241725172617271728172917301731173217331734173517361737173817391740174117421743174417451746174717481749175017511752175317541755175617571758175917601761176217631764176517661767176817691770177117721773177417751776177717781779178017811782178317841785178617871788178917901791179217931794179517961797179817991800180118021803180418051806180718081809181018111812181318141815181618171818181918201821182218231824182518261827182818291830183118321833183418351836183718381839184018411842184318441845184618471848184918501851185218531854185518561857185818591860186118621863186418651866186718681869187018711872187318741875187618771878187918801881188218831884188518861887188818891890189118921893189418951896189718981899190019011902190319041905190619071908190919101911191219131914191519161917191819191920192119221923192419251926192719281929193019311932193319341935193619371938193919401941194219431944194519461947194819491950195119521953195419551956195719581959196019611962196319641965196619671968196919701971197219731974197519761977197819791980198119821983198419851986198719881989199019911992199319941995199619971998199920002001200220032004200520062007200820092010201120122013201420152016201720182019202020212022202320242025202620272028202920302031203220332034203520362037203820392040204120422043204420452046204720482049205020512052205320542055205620572058205920602061206220632064206520662067206820692070207120722073207420752076207720782079208020812082208320842085208620872088208920902091209220932094209520962097209820992100210121022103210421052106210721082109211021112112211321142115211621172118211921202121212221232124212521262127212821292130213121322133213421352136213721382139214021412142214321442145214621472148214921502151215221532154215521562157215821592160216121622163216421652166216721682169217021712172217321742175217621772178217921802181218221832184218521862187218821892190219121922193219421952196219721982199220022012202220322042205220622072208220922102211221222132214221522162217221822192220222122222223222422252226222722282229223022312232223322342235223622372238223922402241224222432244224522462247224822492250225122522253225422552256225722582259226022612262226322642265226622672268226922702271227222732274227522762277227822792280228122822283228422852286228722882289229022912292229322942295229622972298229923002301230223032304230523062307230823092310231123122313231423152316231723182319232023212322232323242325232623272328232923302331233223332334233523362337233823392340234123422343234423452346234723482349235023512352235323542355235623572358235923602361236223632364236523662367236823692370237123722373237423752376237723782379238023812382238323842385238623872388238923902391239223932394239523962397239823992400240124022403240424052406240724082409241024112412241324142415241624172418241924202421242224232424242524262427242824292430243124322433243424352436243724382439244024412442244324442445244624472448244924502451245224532454245524562457245824592460246124622463246424652466246724682469247024712472247324742475247624772478247924802481248224832484248524862487248824892490249124922493249424952496249724982499250025012502250325042505250625072508250925102511251225132514251525162517251825192520252125222523252425252526252725282529253025312532253325342535253625372538253925402541254225432544254525462547254825492550255125522553255425552556255725582559256025612562256325642565256625672568256925702571257225732574257525762577257825792580258125822583258425852586258725882589259025912592259325942595259625972598259926002601260226032604260526062607260826092610261126122613261426152616261726182619262026212622262326242625262626272628262926302631263226332634263526362637263826392640264126422643264426452646264726482649265026512652265326542655265626572658265926602661266226632664266526662667266826692670267126722673267426752676267726782679268026812682268326842685268626872688268926902691269226932694269526962697269826992700270127022703270427052706270727082709271027112712271327142715271627172718271927202721272227232724272527262727272827292730273127322733273427352736273727382739274027412742274327442745274627472748274927502751275227532754275527562757275827592760276127622763276427652766276727682769277027712772277327742775277627772778277927802781278227832784278527862787278827892790279127922793279427952796279727982799280028012802280328042805280628072808280928102811281228132814281528162817281828192820282128222823282428252826282728282829283028312832283328342835283628372838283928402841284228432844284528462847284828492850285128522853285428552856285728582859286028612862286328642865286628672868286928702871287228732874287528762877287828792880288128822883288428852886288728882889289028912892289328942895289628972898289929002901290229032904290529062907290829092910291129122913291429152916291729182919292029212922292329242925292629272928292929302931293229332934293529362937293829392940294129422943294429452946294729482949295029512952295329542955295629572958295929602961296229632964296529662967296829692970297129722973297429752976297729782979298029812982298329842985298629872988298929902991299229932994299529962997299829993000300130023003300430053006300730083009301030113012301330143015301630173018301930203021302230233024302530263027302830293030303130323033303430353036303730383039304030413042304330443045304630473048304930503051305230533054305530563057305830593060306130623063306430653066306730683069307030713072307330743075307630773078307930803081308230833084308530863087308830893090309130923093309430953096309730983099310031013102310331043105310631073108310931103111311231133114311531163117311831193120312131223123312431253126312731283129313031313132313331343135313631373138313931403141314231433144314531463147314831493150315131523153315431553156315731583159316031613162316331643165316631673168316931703171317231733174317531763177317831793180318131823183318431853186318731883189319031913192319331943195319631973198319932003201320232033204320532063207320832093210321132123213321432153216321732183219322032213222322332243225322632273228322932303231323232333234323532363237323832393240324132423243324432453246324732483249 |
- /* write.c - emit .o file
- Copyright (C) 1986-2022 Free Software Foundation, Inc.
- This file is part of GAS, the GNU Assembler.
- GAS is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3, or (at your option)
- any later version.
- GAS is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with GAS; see the file COPYING. If not, write to the Free
- Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
- 02110-1301, USA. */
- /* This thing should be set up to do byte ordering correctly. But... */
- #include "as.h"
- #include "subsegs.h"
- #include "obstack.h"
- #include "output-file.h"
- #include "dwarf2dbg.h"
- #include "compress-debug.h"
- #ifndef TC_FORCE_RELOCATION
- #define TC_FORCE_RELOCATION(FIX) \
- (generic_force_reloc (FIX))
- #endif
- #ifndef TC_FORCE_RELOCATION_ABS
- #define TC_FORCE_RELOCATION_ABS(FIX) \
- (TC_FORCE_RELOCATION (FIX))
- #endif
- #define GENERIC_FORCE_RELOCATION_LOCAL(FIX) \
- (!(FIX)->fx_pcrel \
- || TC_FORCE_RELOCATION (FIX))
- #ifndef TC_FORCE_RELOCATION_LOCAL
- #define TC_FORCE_RELOCATION_LOCAL GENERIC_FORCE_RELOCATION_LOCAL
- #endif
- #define GENERIC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \
- (!SEG_NORMAL (SEG))
- #ifndef TC_FORCE_RELOCATION_SUB_SAME
- #define TC_FORCE_RELOCATION_SUB_SAME GENERIC_FORCE_RELOCATION_SUB_SAME
- #endif
- #ifndef md_register_arithmetic
- # define md_register_arithmetic 1
- #endif
- #ifndef TC_FORCE_RELOCATION_SUB_ABS
- #define TC_FORCE_RELOCATION_SUB_ABS(FIX, SEG) \
- (!md_register_arithmetic && (SEG) == reg_section)
- #endif
- #ifndef TC_FORCE_RELOCATION_SUB_LOCAL
- #ifdef DIFF_EXPR_OK
- #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) \
- (!md_register_arithmetic && (SEG) == reg_section)
- #else
- #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) 1
- #endif
- #endif
- #ifndef TC_VALIDATE_FIX_SUB
- #define TC_VALIDATE_FIX_SUB(FIX, SEG) 0
- #endif
- #ifndef TC_LINKRELAX_FIXUP
- #define TC_LINKRELAX_FIXUP(SEG) 1
- #endif
- #ifndef MD_APPLY_SYM_VALUE
- #define MD_APPLY_SYM_VALUE(FIX) 1
- #endif
- #ifndef TC_FINALIZE_SYMS_BEFORE_SIZE_SEG
- #define TC_FINALIZE_SYMS_BEFORE_SIZE_SEG 1
- #endif
- #ifndef MD_PCREL_FROM_SECTION
- #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from (FIX)
- #endif
- #ifndef TC_FAKE_LABEL
- #define TC_FAKE_LABEL(NAME) (strcmp ((NAME), FAKE_LABEL_NAME) == 0)
- #endif
- /* Positive values of TC_FX_SIZE_SLACK allow a target to define
- fixups that far past the end of a frag. Having such fixups
- is of course most most likely a bug in setting fx_size correctly.
- A negative value disables the fixup check entirely, which is
- appropriate for something like the Renesas / SuperH SH_COUNT
- reloc. */
- #ifndef TC_FX_SIZE_SLACK
- #define TC_FX_SIZE_SLACK(FIX) 0
- #endif
- /* Used to control final evaluation of expressions. */
- int finalize_syms = 0;
- int symbol_table_frozen;
- symbolS *abs_section_sym;
- /* Remember the value of dot when parsing expressions. */
- addressT dot_value;
- /* The frag that dot_value is based from. */
- fragS *dot_frag;
- /* Relocs generated by ".reloc" pseudo. */
- struct reloc_list* reloc_list;
- void print_fixup (fixS *);
- /* We generally attach relocs to frag chains. However, after we have
- chained these all together into a segment, any relocs we add after
- that must be attached to a segment. This will include relocs added
- in md_estimate_size_for_relax, for example. */
- static int frags_chained = 0;
- static int n_fixups;
- #define RELOC_ENUM enum bfd_reloc_code_real
- /* Create a fixS in obstack 'notes'. */
- static fixS *
- fix_new_internal (fragS *frag, /* Which frag? */
- unsigned long where, /* Where in that frag? */
- unsigned long size, /* 1, 2, or 4 usually. */
- symbolS *add_symbol, /* X_add_symbol. */
- symbolS *sub_symbol, /* X_op_symbol. */
- offsetT offset, /* X_add_number. */
- int pcrel, /* TRUE if PC-relative relocation. */
- RELOC_ENUM r_type /* Relocation type. */,
- int at_beginning) /* Add to the start of the list? */
- {
- fixS *fixP;
- n_fixups++;
- fixP = (fixS *) obstack_alloc (¬es, sizeof (fixS));
- fixP->fx_frag = frag;
- fixP->fx_where = where;
- fixP->fx_size = size;
- /* We've made fx_size a narrow field; check that it's wide enough. */
- if (fixP->fx_size != size)
- {
- as_bad (_("field fx_size too small to hold %lu"), size);
- abort ();
- }
- fixP->fx_addsy = add_symbol;
- fixP->fx_subsy = sub_symbol;
- fixP->fx_offset = offset;
- fixP->fx_dot_value = dot_value;
- fixP->fx_dot_frag = dot_frag;
- fixP->fx_pcrel = pcrel;
- fixP->fx_r_type = r_type;
- fixP->fx_pcrel_adjust = 0;
- fixP->fx_addnumber = 0;
- fixP->fx_tcbit = 0;
- fixP->fx_tcbit2 = 0;
- fixP->fx_done = 0;
- fixP->fx_no_overflow = 0;
- fixP->fx_signed = 0;
- #ifdef USING_CGEN
- fixP->fx_cgen.insn = NULL;
- fixP->fx_cgen.opinfo = 0;
- #endif
- #ifdef TC_FIX_TYPE
- TC_INIT_FIX_DATA (fixP);
- #endif
- fixP->fx_file = as_where (&fixP->fx_line);
- {
- fixS **seg_fix_rootP = (frags_chained
- ? &seg_info (now_seg)->fix_root
- : &frchain_now->fix_root);
- fixS **seg_fix_tailP = (frags_chained
- ? &seg_info (now_seg)->fix_tail
- : &frchain_now->fix_tail);
- if (at_beginning)
- {
- fixP->fx_next = *seg_fix_rootP;
- *seg_fix_rootP = fixP;
- if (fixP->fx_next == NULL)
- *seg_fix_tailP = fixP;
- }
- else
- {
- fixP->fx_next = NULL;
- if (*seg_fix_tailP)
- (*seg_fix_tailP)->fx_next = fixP;
- else
- *seg_fix_rootP = fixP;
- *seg_fix_tailP = fixP;
- }
- }
- return fixP;
- }
- /* Create a fixup relative to a symbol (plus a constant). */
- fixS *
- fix_new (fragS *frag, /* Which frag? */
- unsigned long where, /* Where in that frag? */
- unsigned long size, /* 1, 2, or 4 usually. */
- symbolS *add_symbol, /* X_add_symbol. */
- offsetT offset, /* X_add_number. */
- int pcrel, /* TRUE if PC-relative relocation. */
- RELOC_ENUM r_type /* Relocation type. */)
- {
- return fix_new_internal (frag, where, size, add_symbol,
- (symbolS *) NULL, offset, pcrel, r_type, false);
- }
- /* Create a fixup for an expression. Currently we only support fixups
- for difference expressions. That is itself more than most object
- file formats support anyhow. */
- fixS *
- fix_new_exp (fragS *frag, /* Which frag? */
- unsigned long where, /* Where in that frag? */
- unsigned long size, /* 1, 2, or 4 usually. */
- expressionS *exp, /* Expression. */
- int pcrel, /* TRUE if PC-relative relocation. */
- RELOC_ENUM r_type /* Relocation type. */)
- {
- symbolS *add = NULL;
- symbolS *sub = NULL;
- offsetT off = 0;
- switch (exp->X_op)
- {
- case O_absent:
- break;
- case O_register:
- as_bad (_("register value used as expression"));
- break;
- case O_add:
- /* This comes up when _GLOBAL_OFFSET_TABLE_+(.-L0) is read, if
- the difference expression cannot immediately be reduced. */
- {
- symbolS *stmp = make_expr_symbol (exp);
- exp->X_op = O_symbol;
- exp->X_op_symbol = 0;
- exp->X_add_symbol = stmp;
- exp->X_add_number = 0;
- return fix_new_exp (frag, where, size, exp, pcrel, r_type);
- }
- case O_symbol_rva:
- add = exp->X_add_symbol;
- off = exp->X_add_number;
- r_type = BFD_RELOC_RVA;
- break;
- case O_uminus:
- sub = exp->X_add_symbol;
- off = exp->X_add_number;
- break;
- case O_subtract:
- sub = exp->X_op_symbol;
- /* Fall through. */
- case O_symbol:
- add = exp->X_add_symbol;
- /* Fall through. */
- case O_constant:
- off = exp->X_add_number;
- break;
- default:
- add = make_expr_symbol (exp);
- break;
- }
- return fix_new_internal (frag, where, size, add, sub, off, pcrel,
- r_type, false);
- }
- /* Create a fixup at the beginning of FRAG. The arguments are the same
- as for fix_new, except that WHERE is implicitly 0. */
- fixS *
- fix_at_start (fragS *frag, unsigned long size, symbolS *add_symbol,
- offsetT offset, int pcrel, RELOC_ENUM r_type)
- {
- return fix_new_internal (frag, 0, size, add_symbol,
- (symbolS *) NULL, offset, pcrel, r_type, true);
- }
- /* Generic function to determine whether a fixup requires a relocation. */
- int
- generic_force_reloc (fixS *fix)
- {
- if (fix->fx_r_type == BFD_RELOC_VTABLE_INHERIT
- || fix->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
- return 1;
- if (fix->fx_addsy == NULL)
- return 0;
- return S_FORCE_RELOC (fix->fx_addsy, fix->fx_subsy == NULL);
- }
- /* Append a string onto another string, bumping the pointer along. */
- void
- append (char **charPP, char *fromP, unsigned long length)
- {
- /* Don't trust memcpy() of 0 chars. */
- if (length == 0)
- return;
- memcpy (*charPP, fromP, length);
- *charPP += length;
- }
- /* This routine records the largest alignment seen for each segment.
- If the beginning of the segment is aligned on the worst-case
- boundary, all of the other alignments within it will work. At
- least one object format really uses this info. */
- void
- record_alignment (/* Segment to which alignment pertains. */
- segT seg,
- /* Alignment, as a power of 2 (e.g., 1 => 2-byte
- boundary, 2 => 4-byte boundary, etc.) */
- unsigned int align)
- {
- if (seg == absolute_section)
- return;
- if (align > bfd_section_alignment (seg))
- bfd_set_section_alignment (seg, align);
- }
- int
- get_recorded_alignment (segT seg)
- {
- if (seg == absolute_section)
- return 0;
- return bfd_section_alignment (seg);
- }
- /* Reset the section indices after removing the gas created sections. */
- static void
- renumber_sections (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *countparg)
- {
- int *countp = (int *) countparg;
- sec->index = *countp;
- ++*countp;
- }
- static fragS *
- chain_frchains_together_1 (segT section, struct frchain *frchp)
- {
- fragS dummy, *prev_frag = &dummy;
- fixS fix_dummy, *prev_fix = &fix_dummy;
- for (; frchp; frchp = frchp->frch_next)
- {
- prev_frag->fr_next = frchp->frch_root;
- prev_frag = frchp->frch_last;
- gas_assert (prev_frag->fr_type != 0);
- if (frchp->fix_root != (fixS *) NULL)
- {
- if (seg_info (section)->fix_root == (fixS *) NULL)
- seg_info (section)->fix_root = frchp->fix_root;
- prev_fix->fx_next = frchp->fix_root;
- seg_info (section)->fix_tail = frchp->fix_tail;
- prev_fix = frchp->fix_tail;
- }
- }
- gas_assert (prev_frag != &dummy
- && prev_frag->fr_type != 0);
- prev_frag->fr_next = 0;
- return prev_frag;
- }
- static void
- chain_frchains_together (bfd *abfd ATTRIBUTE_UNUSED,
- segT section,
- void *xxx ATTRIBUTE_UNUSED)
- {
- segment_info_type *info;
- /* BFD may have introduced its own sections without using
- subseg_new, so it is possible that seg_info is NULL. */
- info = seg_info (section);
- if (info != (segment_info_type *) NULL)
- info->frchainP->frch_last
- = chain_frchains_together_1 (section, info->frchainP);
- /* Now that we've chained the frags together, we must add new fixups
- to the segment, not to the frag chain. */
- frags_chained = 1;
- }
- static void
- cvt_frag_to_fill (segT sec ATTRIBUTE_UNUSED, fragS *fragP)
- {
- switch (fragP->fr_type)
- {
- case rs_space_nop:
- goto skip_align;
- case rs_align:
- case rs_align_code:
- case rs_align_test:
- case rs_org:
- case rs_space:
- #ifdef HANDLE_ALIGN
- HANDLE_ALIGN (fragP);
- #endif
- skip_align:
- know (fragP->fr_next != NULL);
- fragP->fr_offset = (fragP->fr_next->fr_address
- - fragP->fr_address
- - fragP->fr_fix) / fragP->fr_var;
- if (fragP->fr_offset < 0)
- {
- as_bad_where (fragP->fr_file, fragP->fr_line,
- _("attempt to .org/.space/.nops backwards? (%ld)"),
- (long) fragP->fr_offset);
- fragP->fr_offset = 0;
- }
- if (fragP->fr_type == rs_space_nop)
- fragP->fr_type = rs_fill_nop;
- else
- fragP->fr_type = rs_fill;
- break;
- case rs_fill:
- case rs_fill_nop:
- break;
- case rs_leb128:
- {
- valueT value = S_GET_VALUE (fragP->fr_symbol);
- int size;
- if (!S_IS_DEFINED (fragP->fr_symbol))
- {
- as_bad_where (fragP->fr_file, fragP->fr_line,
- _("leb128 operand is an undefined symbol: %s"),
- S_GET_NAME (fragP->fr_symbol));
- }
- size = output_leb128 (fragP->fr_literal + fragP->fr_fix, value,
- fragP->fr_subtype);
- fragP->fr_fix += size;
- fragP->fr_type = rs_fill;
- fragP->fr_var = 0;
- fragP->fr_offset = 0;
- fragP->fr_symbol = NULL;
- }
- break;
- case rs_cfa:
- eh_frame_convert_frag (fragP);
- break;
- case rs_dwarf2dbg:
- dwarf2dbg_convert_frag (fragP);
- break;
- case rs_machine_dependent:
- md_convert_frag (stdoutput, sec, fragP);
- gas_assert (fragP->fr_next == NULL
- || (fragP->fr_next->fr_address - fragP->fr_address
- == fragP->fr_fix));
- /* After md_convert_frag, we make the frag into a ".space 0".
- md_convert_frag() should set up any fixSs and constants
- required. */
- frag_wane (fragP);
- break;
- #ifndef WORKING_DOT_WORD
- case rs_broken_word:
- {
- struct broken_word *lie;
- if (fragP->fr_subtype)
- {
- fragP->fr_fix += md_short_jump_size;
- for (lie = (struct broken_word *) (fragP->fr_symbol);
- lie && lie->dispfrag == fragP;
- lie = lie->next_broken_word)
- if (lie->added == 1)
- fragP->fr_fix += md_long_jump_size;
- }
- frag_wane (fragP);
- }
- break;
- #endif
- default:
- BAD_CASE (fragP->fr_type);
- break;
- }
- #ifdef md_frag_check
- md_frag_check (fragP);
- #endif
- }
- struct relax_seg_info
- {
- int pass;
- int changed;
- };
- static void
- relax_seg (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *xxx)
- {
- segment_info_type *seginfo = seg_info (sec);
- struct relax_seg_info *info = (struct relax_seg_info *) xxx;
- if (seginfo && seginfo->frchainP
- && relax_segment (seginfo->frchainP->frch_root, sec, info->pass))
- info->changed = 1;
- }
- static void
- size_seg (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *xxx ATTRIBUTE_UNUSED)
- {
- flagword flags;
- fragS *fragp;
- segment_info_type *seginfo;
- int x;
- valueT size, newsize;
- subseg_change (sec, 0);
- seginfo = seg_info (sec);
- if (seginfo && seginfo->frchainP)
- {
- for (fragp = seginfo->frchainP->frch_root; fragp; fragp = fragp->fr_next)
- cvt_frag_to_fill (sec, fragp);
- for (fragp = seginfo->frchainP->frch_root;
- fragp->fr_next;
- fragp = fragp->fr_next)
- /* Walk to last elt. */
- ;
- size = fragp->fr_address + fragp->fr_fix;
- }
- else
- size = 0;
- flags = bfd_section_flags (sec);
- if (size == 0 && bfd_section_size (sec) != 0 &&
- (flags & SEC_HAS_CONTENTS) != 0)
- return;
- if (size > 0 && ! seginfo->bss)
- flags |= SEC_HAS_CONTENTS;
- flags &= ~SEC_RELOC;
- x = bfd_set_section_flags (sec, flags);
- gas_assert (x);
- /* If permitted, allow the backend to pad out the section
- to some alignment boundary. */
- if (do_not_pad_sections_to_alignment)
- newsize = size;
- else
- newsize = md_section_align (sec, size);
- x = bfd_set_section_size (sec, newsize);
- gas_assert (x);
- /* If the size had to be rounded up, add some padding in the last
- non-empty frag. */
- gas_assert (newsize >= size);
- if (size != newsize)
- {
- fragS *last = seginfo->frchainP->frch_last;
- fragp = seginfo->frchainP->frch_root;
- while (fragp->fr_next != last)
- fragp = fragp->fr_next;
- last->fr_address = size;
- if ((newsize - size) % fragp->fr_var == 0)
- fragp->fr_offset += (newsize - size) / fragp->fr_var;
- else
- /* If we hit this abort, it's likely due to subsegs_finish not
- providing sufficient alignment on the last frag, and the
- machine dependent code using alignment frags with fr_var
- greater than 1. */
- abort ();
- }
- #ifdef tc_frob_section
- tc_frob_section (sec);
- #endif
- #ifdef obj_frob_section
- obj_frob_section (sec);
- #endif
- }
- #ifdef DEBUG2
- static void
- dump_section_relocs (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, FILE *stream)
- {
- segment_info_type *seginfo = seg_info (sec);
- fixS *fixp = seginfo->fix_root;
- if (!fixp)
- return;
- fprintf (stream, "sec %s relocs:\n", sec->name);
- while (fixp)
- {
- symbolS *s = fixp->fx_addsy;
- fprintf (stream, " %08lx: type %d ", (unsigned long) fixp,
- (int) fixp->fx_r_type);
- if (s == NULL)
- fprintf (stream, "no sym\n");
- else
- {
- print_symbol_value_1 (stream, s);
- fprintf (stream, "\n");
- }
- fixp = fixp->fx_next;
- }
- }
- #else
- #define dump_section_relocs(ABFD,SEC,STREAM) ((void) 0)
- #endif
- #ifndef EMIT_SECTION_SYMBOLS
- #define EMIT_SECTION_SYMBOLS 1
- #endif
- /* Resolve U.A.OFFSET_SYM and U.A.SYM fields of RELOC_LIST entries,
- and check for validity. Convert RELOC_LIST from using U.A fields
- to U.B fields. */
- static void
- resolve_reloc_expr_symbols (void)
- {
- bfd_vma addr_mask = 1;
- struct reloc_list *r;
- /* Avoid a shift by the width of type. */
- addr_mask <<= bfd_arch_bits_per_address (stdoutput) - 1;
- addr_mask <<= 1;
- addr_mask -= 1;
- for (r = reloc_list; r; r = r->next)
- {
- reloc_howto_type *howto = r->u.a.howto;
- expressionS *symval;
- symbolS *sym;
- bfd_vma offset, addend;
- asection *sec;
- resolve_symbol_value (r->u.a.offset_sym);
- symval = symbol_get_value_expression (r->u.a.offset_sym);
- offset = 0;
- sym = NULL;
- if (symval->X_op == O_constant)
- sym = r->u.a.offset_sym;
- else if (symval->X_op == O_symbol)
- {
- sym = symval->X_add_symbol;
- offset = symval->X_add_number;
- symval = symbol_get_value_expression (symval->X_add_symbol);
- }
- if (sym == NULL
- || symval->X_op != O_constant
- || (sec = S_GET_SEGMENT (sym)) == NULL
- || !SEG_NORMAL (sec))
- {
- as_bad_where (r->file, r->line, _("invalid offset expression"));
- sec = NULL;
- }
- else
- offset += S_GET_VALUE (sym);
- sym = NULL;
- addend = r->u.a.addend;
- if (r->u.a.sym != NULL)
- {
- resolve_symbol_value (r->u.a.sym);
- symval = symbol_get_value_expression (r->u.a.sym);
- if (symval->X_op == O_constant)
- sym = r->u.a.sym;
- else if (symval->X_op == O_symbol)
- {
- sym = symval->X_add_symbol;
- addend += symval->X_add_number;
- symval = symbol_get_value_expression (symval->X_add_symbol);
- }
- if (symval->X_op != O_constant)
- {
- as_bad_where (r->file, r->line, _("invalid reloc expression"));
- sec = NULL;
- }
- else if (sym != NULL && sec != NULL)
- {
- /* Convert relocs against local symbols to refer to the
- corresponding section symbol plus offset instead. Keep
- PC-relative relocs of the REL variety intact though to
- prevent the offset from overflowing the relocated field,
- unless it has enough bits to cover the whole address
- space. */
- if (S_IS_LOCAL (sym)
- && S_IS_DEFINED (sym)
- && !symbol_section_p (sym)
- && (sec->use_rela_p
- || (howto->partial_inplace
- && (!howto->pc_relative
- || howto->src_mask == addr_mask))))
- {
- asection *symsec = S_GET_SEGMENT (sym);
- if (!(((symsec->flags & SEC_MERGE) != 0
- && addend != 0)
- || (symsec->flags & SEC_THREAD_LOCAL) != 0))
- {
- addend += S_GET_VALUE (sym);
- sym = section_symbol (symsec);
- }
- }
- symbol_mark_used_in_reloc (sym);
- }
- }
- if (sym == NULL)
- {
- if (abs_section_sym == NULL)
- abs_section_sym = section_symbol (absolute_section);
- sym = abs_section_sym;
- }
- r->u.b.sec = sec;
- r->u.b.s = symbol_get_bfdsym (sym);
- r->u.b.r.sym_ptr_ptr = &r->u.b.s;
- r->u.b.r.address = offset;
- r->u.b.r.addend = addend;
- r->u.b.r.howto = howto;
- }
- }
- /* This pass over fixups decides whether symbols can be replaced with
- section symbols. */
- static void
- adjust_reloc_syms (bfd *abfd ATTRIBUTE_UNUSED,
- asection *sec,
- void *xxx ATTRIBUTE_UNUSED)
- {
- segment_info_type *seginfo = seg_info (sec);
- fixS *fixp;
- if (seginfo == NULL)
- return;
- dump_section_relocs (abfd, sec, stderr);
- for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
- if (fixp->fx_done)
- /* Ignore it. */
- ;
- else if (fixp->fx_addsy)
- {
- symbolS *sym;
- asection *symsec;
- #ifdef DEBUG5
- fprintf (stderr, "\n\nadjusting fixup:\n");
- print_fixup (fixp);
- #endif
- sym = fixp->fx_addsy;
- /* All symbols should have already been resolved at this
- point. It is possible to see unresolved expression
- symbols, though, since they are not in the regular symbol
- table. */
- resolve_symbol_value (sym);
- if (fixp->fx_subsy != NULL)
- resolve_symbol_value (fixp->fx_subsy);
- /* If this symbol is equated to an undefined or common symbol,
- convert the fixup to being against that symbol. */
- while (symbol_equated_reloc_p (sym)
- || S_IS_WEAKREFR (sym))
- {
- symbolS *newsym = symbol_get_value_expression (sym)->X_add_symbol;
- if (sym == newsym)
- break;
- fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
- fixp->fx_addsy = newsym;
- sym = newsym;
- }
- if (symbol_mri_common_p (sym))
- {
- fixp->fx_offset += S_GET_VALUE (sym);
- fixp->fx_addsy = symbol_get_value_expression (sym)->X_add_symbol;
- continue;
- }
- /* If the symbol is undefined, common, weak, or global (ELF
- shared libs), we can't replace it with the section symbol. */
- if (S_FORCE_RELOC (fixp->fx_addsy, 1))
- continue;
- /* Is there some other (target cpu dependent) reason we can't adjust
- this one? (E.g. relocations involving function addresses on
- the PA. */
- #ifdef tc_fix_adjustable
- if (! tc_fix_adjustable (fixp))
- continue;
- #endif
- /* Since we're reducing to section symbols, don't attempt to reduce
- anything that's already using one. */
- if (symbol_section_p (sym))
- {
- /* Mark the section symbol used in relocation so that it will
- be included in the symbol table. */
- symbol_mark_used_in_reloc (sym);
- continue;
- }
- symsec = S_GET_SEGMENT (sym);
- if (symsec == NULL)
- abort ();
- if (bfd_is_abs_section (symsec)
- || symsec == reg_section)
- {
- /* The fixup_segment routine normally will not use this
- symbol in a relocation. */
- continue;
- }
- /* Don't try to reduce relocs which refer to non-local symbols
- in .linkonce sections. It can lead to confusion when a
- debugging section refers to a .linkonce section. I hope
- this will always be correct. */
- if (symsec != sec && ! S_IS_LOCAL (sym))
- {
- if ((symsec->flags & SEC_LINK_ONCE) != 0
- || (IS_ELF
- /* The GNU toolchain uses an extension for ELF: a
- section beginning with the magic string
- .gnu.linkonce is a linkonce section. */
- && startswith (segment_name (symsec), ".gnu.linkonce")))
- continue;
- }
- /* Never adjust a reloc against local symbol in a merge section
- with non-zero addend. */
- if ((symsec->flags & SEC_MERGE) != 0
- && (fixp->fx_offset != 0 || fixp->fx_subsy != NULL))
- continue;
- /* Never adjust a reloc against TLS local symbol. */
- if ((symsec->flags & SEC_THREAD_LOCAL) != 0)
- continue;
- /* We refetch the segment when calling section_symbol, rather
- than using symsec, because S_GET_VALUE may wind up changing
- the section when it calls resolve_symbol_value. */
- fixp->fx_offset += S_GET_VALUE (sym);
- fixp->fx_addsy = section_symbol (S_GET_SEGMENT (sym));
- #ifdef DEBUG5
- fprintf (stderr, "\nadjusted fixup:\n");
- print_fixup (fixp);
- #endif
- }
- dump_section_relocs (abfd, sec, stderr);
- }
- void
- as_bad_subtract (fixS *fixp)
- {
- as_bad_where (fixp->fx_file, fixp->fx_line,
- _("can't resolve %s - %s"),
- fixp->fx_addsy ? S_GET_NAME (fixp->fx_addsy) : "0",
- S_GET_NAME (fixp->fx_subsy));
- }
- /* fixup_segment()
- Go through all the fixS's in a segment and see which ones can be
- handled now. (These consist of fixS where we have since discovered
- the value of a symbol, or the address of the frag involved.)
- For each one, call md_apply_fix to put the fix into the frag data.
- Ones that we couldn't completely handle here will be output later
- by emit_relocations. */
- static void
- fixup_segment (fixS *fixP, segT this_segment)
- {
- valueT add_number;
- fragS *fragP;
- if (fixP != NULL && abs_section_sym == NULL)
- abs_section_sym = section_symbol (absolute_section);
- /* If the linker is doing the relaxing, we must not do any fixups.
- Well, strictly speaking that's not true -- we could do any that
- are PC-relative and don't cross regions that could change size. */
- if (linkrelax && TC_LINKRELAX_FIXUP (this_segment))
- {
- for (; fixP; fixP = fixP->fx_next)
- if (!fixP->fx_done)
- {
- if (fixP->fx_addsy == NULL)
- {
- /* There was no symbol required by this relocation.
- However, BFD doesn't really handle relocations
- without symbols well. So fake up a local symbol in
- the absolute section. */
- fixP->fx_addsy = abs_section_sym;
- }
- symbol_mark_used_in_reloc (fixP->fx_addsy);
- if (fixP->fx_subsy != NULL)
- symbol_mark_used_in_reloc (fixP->fx_subsy);
- }
- return;
- }
- for (; fixP; fixP = fixP->fx_next)
- {
- segT add_symbol_segment = absolute_section;
- #ifdef DEBUG5
- fprintf (stderr, "\nprocessing fixup:\n");
- print_fixup (fixP);
- #endif
- fragP = fixP->fx_frag;
- know (fragP);
- #ifdef TC_VALIDATE_FIX
- TC_VALIDATE_FIX (fixP, this_segment, skip);
- #endif
- add_number = fixP->fx_offset;
- if (fixP->fx_addsy != NULL)
- add_symbol_segment = S_GET_SEGMENT (fixP->fx_addsy);
- if (fixP->fx_subsy != NULL)
- {
- segT sub_symbol_segment;
- resolve_symbol_value (fixP->fx_subsy);
- sub_symbol_segment = S_GET_SEGMENT (fixP->fx_subsy);
- if (fixP->fx_addsy != NULL
- && sub_symbol_segment == add_symbol_segment
- && !S_FORCE_RELOC (fixP->fx_addsy, 0)
- && !S_FORCE_RELOC (fixP->fx_subsy, 0)
- && !TC_FORCE_RELOCATION_SUB_SAME (fixP, add_symbol_segment))
- {
- add_number += S_GET_VALUE (fixP->fx_addsy);
- add_number -= S_GET_VALUE (fixP->fx_subsy);
- fixP->fx_offset = add_number;
- fixP->fx_addsy = NULL;
- fixP->fx_subsy = NULL;
- #ifdef TC_M68K
- /* See the comment below about 68k weirdness. */
- fixP->fx_pcrel = 0;
- #endif
- }
- else if (sub_symbol_segment == absolute_section
- && !S_FORCE_RELOC (fixP->fx_subsy, 0)
- && !TC_FORCE_RELOCATION_SUB_ABS (fixP, add_symbol_segment))
- {
- add_number -= S_GET_VALUE (fixP->fx_subsy);
- fixP->fx_offset = add_number;
- fixP->fx_subsy = NULL;
- }
- else if (sub_symbol_segment == this_segment
- && !S_FORCE_RELOC (fixP->fx_subsy, 0)
- && !TC_FORCE_RELOCATION_SUB_LOCAL (fixP, add_symbol_segment))
- {
- add_number -= S_GET_VALUE (fixP->fx_subsy);
- fixP->fx_offset = (add_number + fixP->fx_dot_value
- + fixP->fx_dot_frag->fr_address);
- /* Make it pc-relative. If the back-end code has not
- selected a pc-relative reloc, cancel the adjustment
- we do later on all pc-relative relocs. */
- if (0
- #ifdef TC_M68K
- /* Do this for m68k even if it's already described
- as pc-relative. On the m68k, an operand of
- "pc@(foo-.-2)" should address "foo" in a
- pc-relative mode. */
- || 1
- #endif
- || !fixP->fx_pcrel)
- add_number += MD_PCREL_FROM_SECTION (fixP, this_segment);
- fixP->fx_subsy = NULL;
- fixP->fx_pcrel = 1;
- }
- else if (!TC_VALIDATE_FIX_SUB (fixP, add_symbol_segment))
- {
- if (!md_register_arithmetic
- && (add_symbol_segment == reg_section
- || sub_symbol_segment == reg_section))
- as_bad_where (fixP->fx_file, fixP->fx_line,
- _("register value used as expression"));
- else
- as_bad_subtract (fixP);
- }
- else if (sub_symbol_segment != undefined_section
- && ! bfd_is_com_section (sub_symbol_segment)
- && MD_APPLY_SYM_VALUE (fixP))
- add_number -= S_GET_VALUE (fixP->fx_subsy);
- }
- if (fixP->fx_addsy)
- {
- if (add_symbol_segment == this_segment
- && !S_FORCE_RELOC (fixP->fx_addsy, 0)
- && !TC_FORCE_RELOCATION_LOCAL (fixP))
- {
- /* This fixup was made when the symbol's segment was
- SEG_UNKNOWN, but it is now in the local segment.
- So we know how to do the address without relocation. */
- add_number += S_GET_VALUE (fixP->fx_addsy);
- fixP->fx_offset = add_number;
- if (fixP->fx_pcrel)
- add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
- fixP->fx_addsy = NULL;
- fixP->fx_pcrel = 0;
- }
- else if (add_symbol_segment == absolute_section
- && !S_FORCE_RELOC (fixP->fx_addsy, 0)
- && !TC_FORCE_RELOCATION_ABS (fixP))
- {
- add_number += S_GET_VALUE (fixP->fx_addsy);
- fixP->fx_offset = add_number;
- fixP->fx_addsy = NULL;
- }
- else if (add_symbol_segment != undefined_section
- && ! bfd_is_com_section (add_symbol_segment)
- && MD_APPLY_SYM_VALUE (fixP))
- add_number += S_GET_VALUE (fixP->fx_addsy);
- }
- if (fixP->fx_pcrel)
- {
- add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment);
- if (!fixP->fx_done && fixP->fx_addsy == NULL)
- {
- /* There was no symbol required by this relocation.
- However, BFD doesn't really handle relocations
- without symbols well. So fake up a local symbol in
- the absolute section. */
- fixP->fx_addsy = abs_section_sym;
- }
- }
- if (!fixP->fx_done)
- md_apply_fix (fixP, &add_number, this_segment);
- if (!fixP->fx_done)
- {
- if (fixP->fx_addsy == NULL)
- fixP->fx_addsy = abs_section_sym;
- symbol_mark_used_in_reloc (fixP->fx_addsy);
- if (fixP->fx_subsy != NULL)
- symbol_mark_used_in_reloc (fixP->fx_subsy);
- }
- if (!fixP->fx_no_overflow && fixP->fx_size != 0)
- {
- if (fixP->fx_size < sizeof (valueT))
- {
- valueT mask;
- mask = 0;
- mask--; /* Set all bits to one. */
- mask <<= fixP->fx_size * 8 - (fixP->fx_signed ? 1 : 0);
- if ((add_number & mask) != 0
- && (fixP->fx_signed
- ? (add_number & mask) != mask
- : (-add_number & mask) != 0))
- {
- char buf[50], buf2[50];
- bfd_sprintf_vma (stdoutput, buf, fragP->fr_address + fixP->fx_where);
- if (add_number > 1000)
- bfd_sprintf_vma (stdoutput, buf2, add_number);
- else
- sprintf (buf2, "%ld", (long) add_number);
- as_bad_where (fixP->fx_file, fixP->fx_line,
- ngettext ("value of %s too large for field "
- "of %d byte at %s",
- "value of %s too large for field "
- "of %d bytes at %s",
- fixP->fx_size),
- buf2, fixP->fx_size, buf);
- } /* Generic error checking. */
- }
- #ifdef WARN_SIGNED_OVERFLOW_WORD
- /* Warn if a .word value is too large when treated as a signed
- number. We already know it is not too negative. This is to
- catch over-large switches generated by gcc on the 68k. */
- if (!flag_signed_overflow_ok
- && fixP->fx_size == 2
- && add_number > 0x7fff)
- as_bad_where (fixP->fx_file, fixP->fx_line,
- _("signed .word overflow; switch may be too large; %ld at 0x%lx"),
- (long) add_number,
- (long) (fragP->fr_address + fixP->fx_where));
- #endif
- }
- #ifdef TC_VALIDATE_FIX
- skip: ATTRIBUTE_UNUSED_LABEL
- ;
- #endif
- #ifdef DEBUG5
- fprintf (stderr, "result:\n");
- print_fixup (fixP);
- #endif
- } /* For each fixS in this segment. */
- }
- static void
- fix_segment (bfd *abfd ATTRIBUTE_UNUSED,
- asection *sec,
- void *xxx ATTRIBUTE_UNUSED)
- {
- segment_info_type *seginfo = seg_info (sec);
- fixup_segment (seginfo->fix_root, sec);
- }
- static void
- install_reloc (asection *sec, arelent *reloc, fragS *fragp,
- const char *file, unsigned int line)
- {
- char *err;
- bfd_reloc_status_type s;
- asymbol *sym;
- if (reloc->sym_ptr_ptr != NULL
- && (sym = *reloc->sym_ptr_ptr) != NULL
- && (sym->flags & BSF_KEEP) == 0
- && ((sym->flags & BSF_SECTION_SYM) == 0
- || (EMIT_SECTION_SYMBOLS
- && !bfd_is_abs_section (sym->section))))
- as_bad_where (file, line, _("redefined symbol cannot be used on reloc"));
- s = bfd_install_relocation (stdoutput, reloc,
- fragp->fr_literal, fragp->fr_address,
- sec, &err);
- switch (s)
- {
- case bfd_reloc_ok:
- break;
- case bfd_reloc_overflow:
- as_bad_where (file, line, _("relocation overflow"));
- break;
- case bfd_reloc_outofrange:
- as_bad_where (file, line, _("relocation out of range"));
- break;
- default:
- as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
- file, line, s);
- }
- }
- static fragS *
- get_frag_for_reloc (fragS *last_frag,
- const segment_info_type *seginfo,
- const struct reloc_list *r)
- {
- fragS *f;
- for (f = last_frag; f != NULL; f = f->fr_next)
- if (f->fr_address <= r->u.b.r.address
- && r->u.b.r.address < f->fr_address + f->fr_fix)
- return f;
- for (f = seginfo->frchainP->frch_root; f != NULL; f = f->fr_next)
- if (f->fr_address <= r->u.b.r.address
- && r->u.b.r.address < f->fr_address + f->fr_fix)
- return f;
- for (f = seginfo->frchainP->frch_root; f != NULL; f = f->fr_next)
- if (f->fr_address <= r->u.b.r.address
- && r->u.b.r.address <= f->fr_address + f->fr_fix)
- return f;
- as_bad_where (r->file, r->line,
- _("reloc not within (fixed part of) section"));
- return NULL;
- }
- static void
- write_relocs (bfd *abfd ATTRIBUTE_UNUSED, asection *sec,
- void *xxx ATTRIBUTE_UNUSED)
- {
- segment_info_type *seginfo = seg_info (sec);
- unsigned int n;
- struct reloc_list *my_reloc_list, **rp, *r;
- arelent **relocs;
- fixS *fixp;
- fragS *last_frag;
- /* If seginfo is NULL, we did not create this section; don't do
- anything with it. */
- if (seginfo == NULL)
- return;
- n = 0;
- for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
- if (!fixp->fx_done)
- n++;
- #ifdef RELOC_EXPANSION_POSSIBLE
- n *= MAX_RELOC_EXPANSION;
- #endif
- /* Extract relocs for this section from reloc_list. */
- rp = &reloc_list;
- my_reloc_list = NULL;
- while ((r = *rp) != NULL)
- {
- if (r->u.b.sec == sec)
- {
- *rp = r->next;
- r->next = my_reloc_list;
- my_reloc_list = r;
- n++;
- }
- else
- rp = &r->next;
- }
- relocs = XCNEWVEC (arelent *, n);
- n = 0;
- r = my_reloc_list;
- last_frag = NULL;
- for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
- {
- int fx_size, slack;
- valueT loc;
- arelent **reloc;
- #ifndef RELOC_EXPANSION_POSSIBLE
- arelent *rel;
- reloc = &rel;
- #endif
- if (fixp->fx_done)
- continue;
- fx_size = fixp->fx_size;
- slack = TC_FX_SIZE_SLACK (fixp);
- if (slack > 0)
- fx_size = fx_size > slack ? fx_size - slack : 0;
- loc = fixp->fx_where + fx_size;
- if (slack >= 0 && loc > fixp->fx_frag->fr_fix)
- as_bad_where (fixp->fx_file, fixp->fx_line,
- _("internal error: fixup not contained within frag"));
- #ifdef obj_fixup_removed_symbol
- if (fixp->fx_addsy && symbol_removed_p (fixp->fx_addsy))
- obj_fixup_removed_symbol (&fixp->fx_addsy);
- if (fixp->fx_subsy && symbol_removed_p (fixp->fx_subsy))
- obj_fixup_removed_symbol (&fixp->fx_subsy);
- #endif
- #ifndef RELOC_EXPANSION_POSSIBLE
- *reloc = tc_gen_reloc (sec, fixp);
- #else
- reloc = tc_gen_reloc (sec, fixp);
- #endif
- while (*reloc)
- {
- while (r != NULL && r->u.b.r.address < (*reloc)->address)
- {
- fragS *f = get_frag_for_reloc (last_frag, seginfo, r);
- if (f != NULL)
- {
- last_frag = f;
- relocs[n++] = &r->u.b.r;
- install_reloc (sec, &r->u.b.r, f, r->file, r->line);
- }
- r = r->next;
- }
- #ifdef GAS_SORT_RELOCS
- if (n != 0 && (*reloc)->address < relocs[n - 1]->address)
- {
- size_t lo = 0;
- size_t hi = n - 1;
- bfd_vma look = (*reloc)->address;
- while (lo < hi)
- {
- size_t mid = (lo + hi) / 2;
- if (relocs[mid]->address > look)
- hi = mid;
- else
- {
- lo = mid + 1;
- if (relocs[mid]->address == look)
- break;
- }
- }
- while (lo < hi && relocs[lo]->address == look)
- lo++;
- memmove (relocs + lo + 1, relocs + lo,
- (n - lo) * sizeof (*relocs));
- n++;
- relocs[lo] = *reloc;
- }
- else
- #endif
- relocs[n++] = *reloc;
- install_reloc (sec, *reloc, fixp->fx_frag,
- fixp->fx_file, fixp->fx_line);
- #ifndef RELOC_EXPANSION_POSSIBLE
- break;
- #else
- reloc++;
- #endif
- }
- }
- while (r != NULL)
- {
- fragS *f = get_frag_for_reloc (last_frag, seginfo, r);
- if (f != NULL)
- {
- last_frag = f;
- relocs[n++] = &r->u.b.r;
- install_reloc (sec, &r->u.b.r, f, r->file, r->line);
- }
- r = r->next;
- }
- #ifdef DEBUG4
- {
- unsigned int k, j, nsyms;
- asymbol **sympp;
- sympp = bfd_get_outsymbols (stdoutput);
- nsyms = bfd_get_symcount (stdoutput);
- for (k = 0; k < n; k++)
- if (((*relocs[k]->sym_ptr_ptr)->flags & BSF_SECTION_SYM) == 0)
- {
- for (j = 0; j < nsyms; j++)
- if (sympp[j] == *relocs[k]->sym_ptr_ptr)
- break;
- if (j == nsyms)
- abort ();
- }
- }
- #endif
- if (n)
- {
- flagword flags = bfd_section_flags (sec);
- flags |= SEC_RELOC;
- bfd_set_section_flags (sec, flags);
- bfd_set_reloc (stdoutput, sec, relocs, n);
- }
- #ifdef SET_SECTION_RELOCS
- SET_SECTION_RELOCS (sec, relocs, n);
- #endif
- #ifdef DEBUG3
- {
- unsigned int k;
- fprintf (stderr, "relocs for sec %s\n", sec->name);
- for (k = 0; k < n; k++)
- {
- arelent *rel = relocs[k];
- asymbol *s = *rel->sym_ptr_ptr;
- fprintf (stderr, " reloc %2d @%p off %4lx : sym %-10s addend %lx\n",
- k, rel, (unsigned long)rel->address, s->name,
- (unsigned long)rel->addend);
- }
- }
- #endif
- }
- static int
- compress_frag (struct z_stream_s *strm, const char *contents, int in_size,
- fragS **last_newf, struct obstack *ob)
- {
- int out_size;
- int total_out_size = 0;
- fragS *f = *last_newf;
- char *next_out;
- int avail_out;
- /* Call the compression routine repeatedly until it has finished
- processing the frag. */
- while (in_size > 0)
- {
- /* Reserve all the space available in the current chunk.
- If none is available, start a new frag. */
- avail_out = obstack_room (ob);
- if (avail_out <= 0)
- {
- obstack_finish (ob);
- f = frag_alloc (ob);
- f->fr_type = rs_fill;
- (*last_newf)->fr_next = f;
- *last_newf = f;
- avail_out = obstack_room (ob);
- }
- if (avail_out <= 0)
- as_fatal (_("can't extend frag"));
- next_out = obstack_next_free (ob);
- obstack_blank_fast (ob, avail_out);
- out_size = compress_data (strm, &contents, &in_size,
- &next_out, &avail_out);
- if (out_size < 0)
- return -1;
- f->fr_fix += out_size;
- total_out_size += out_size;
- /* Return unused space. */
- if (avail_out > 0)
- obstack_blank_fast (ob, -avail_out);
- }
- return total_out_size;
- }
- static void
- compress_debug (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
- {
- segment_info_type *seginfo = seg_info (sec);
- fragS *f;
- fragS *first_newf;
- fragS *last_newf;
- struct obstack *ob = &seginfo->frchainP->frch_obstack;
- bfd_size_type uncompressed_size = (bfd_size_type) sec->size;
- bfd_size_type compressed_size;
- const char *section_name;
- char *compressed_name;
- char *header;
- struct z_stream_s *strm;
- int x;
- flagword flags = bfd_section_flags (sec);
- unsigned int header_size, compression_header_size;
- if (seginfo == NULL
- || sec->size < 32
- || (flags & (SEC_ALLOC | SEC_HAS_CONTENTS)) == SEC_ALLOC)
- return;
- section_name = bfd_section_name (sec);
- if (!startswith (section_name, ".debug_"))
- return;
- strm = compress_init ();
- if (strm == NULL)
- return;
- if (flag_compress_debug == COMPRESS_DEBUG_GABI_ZLIB)
- {
- compression_header_size
- = bfd_get_compression_header_size (stdoutput, NULL);
- header_size = compression_header_size;
- }
- else
- {
- compression_header_size = 0;
- header_size = 12;
- }
- /* Create a new frag to contain the compression header. */
- first_newf = frag_alloc (ob);
- if (obstack_room (ob) < header_size)
- first_newf = frag_alloc (ob);
- if (obstack_room (ob) < header_size)
- as_fatal (ngettext ("can't extend frag %lu char",
- "can't extend frag %lu chars",
- (unsigned long) header_size),
- (unsigned long) header_size);
- last_newf = first_newf;
- obstack_blank_fast (ob, header_size);
- last_newf->fr_type = rs_fill;
- last_newf->fr_fix = header_size;
- header = last_newf->fr_literal;
- compressed_size = header_size;
- /* Stream the frags through the compression engine, adding new frags
- as necessary to accommodate the compressed output. */
- for (f = seginfo->frchainP->frch_root;
- f;
- f = f->fr_next)
- {
- offsetT fill_size;
- char *fill_literal;
- offsetT count;
- int out_size;
- gas_assert (f->fr_type == rs_fill);
- if (f->fr_fix)
- {
- out_size = compress_frag (strm, f->fr_literal, f->fr_fix,
- &last_newf, ob);
- if (out_size < 0)
- return;
- compressed_size += out_size;
- }
- fill_literal = f->fr_literal + f->fr_fix;
- fill_size = f->fr_var;
- count = f->fr_offset;
- gas_assert (count >= 0);
- if (fill_size && count)
- {
- while (count--)
- {
- out_size = compress_frag (strm, fill_literal, (int) fill_size,
- &last_newf, ob);
- if (out_size < 0)
- return;
- compressed_size += out_size;
- }
- }
- }
- /* Flush the compression state. */
- for (;;)
- {
- int avail_out;
- char *next_out;
- int out_size;
- /* Reserve all the space available in the current chunk.
- If none is available, start a new frag. */
- avail_out = obstack_room (ob);
- if (avail_out <= 0)
- {
- fragS *newf;
- obstack_finish (ob);
- newf = frag_alloc (ob);
- newf->fr_type = rs_fill;
- last_newf->fr_next = newf;
- last_newf = newf;
- avail_out = obstack_room (ob);
- }
- if (avail_out <= 0)
- as_fatal (_("can't extend frag"));
- next_out = obstack_next_free (ob);
- obstack_blank_fast (ob, avail_out);
- x = compress_finish (strm, &next_out, &avail_out, &out_size);
- if (x < 0)
- return;
- last_newf->fr_fix += out_size;
- compressed_size += out_size;
- /* Return unused space. */
- if (avail_out > 0)
- obstack_blank_fast (ob, -avail_out);
- if (x == 0)
- break;
- }
- /* PR binutils/18087: If compression didn't make the section smaller,
- just keep it uncompressed. */
- if (compressed_size >= uncompressed_size)
- return;
- /* Replace the uncompressed frag list with the compressed frag list. */
- seginfo->frchainP->frch_root = first_newf;
- seginfo->frchainP->frch_last = last_newf;
- /* Update the section size and its name. */
- bfd_update_compression_header (abfd, (bfd_byte *) header, sec);
- x = bfd_set_section_size (sec, compressed_size);
- gas_assert (x);
- if (!compression_header_size)
- {
- compressed_name = concat (".z", section_name + 1, (char *) NULL);
- bfd_rename_section (sec, compressed_name);
- }
- }
- #ifndef md_generate_nops
- /* Genenerate COUNT bytes of no-op instructions to WHERE. A target
- backend must override this with proper no-op instructions. */
- static void
- md_generate_nops (fragS *f ATTRIBUTE_UNUSED,
- char *where ATTRIBUTE_UNUSED,
- offsetT count ATTRIBUTE_UNUSED,
- int control ATTRIBUTE_UNUSED)
- {
- as_bad (_("unimplemented .nops directive"));
- }
- #endif
- static void
- write_contents (bfd *abfd ATTRIBUTE_UNUSED,
- asection *sec,
- void *xxx ATTRIBUTE_UNUSED)
- {
- segment_info_type *seginfo = seg_info (sec);
- addressT offset = 0;
- fragS *f;
- /* Write out the frags. */
- if (seginfo == NULL
- || !(bfd_section_flags (sec) & SEC_HAS_CONTENTS))
- return;
- for (f = seginfo->frchainP->frch_root;
- f;
- f = f->fr_next)
- {
- int x;
- addressT fill_size;
- char *fill_literal;
- offsetT count;
- gas_assert (f->fr_type == rs_fill || f->fr_type == rs_fill_nop);
- if (f->fr_fix)
- {
- x = bfd_set_section_contents (stdoutput, sec,
- f->fr_literal, (file_ptr) offset,
- (bfd_size_type) f->fr_fix);
- if (!x)
- as_fatal (ngettext ("can't write %ld byte "
- "to section %s of %s: '%s'",
- "can't write %ld bytes "
- "to section %s of %s: '%s'",
- (long) f->fr_fix),
- (long) f->fr_fix,
- bfd_section_name (sec), bfd_get_filename (stdoutput),
- bfd_errmsg (bfd_get_error ()));
- offset += f->fr_fix;
- }
- fill_size = f->fr_var;
- count = f->fr_offset;
- fill_literal = f->fr_literal + f->fr_fix;
- if (f->fr_type == rs_fill_nop)
- {
- gas_assert (count >= 0 && fill_size == 1);
- if (count > 0)
- {
- char *buf = xmalloc (count);
- md_generate_nops (f, buf, count, *fill_literal);
- x = bfd_set_section_contents
- (stdoutput, sec, buf, (file_ptr) offset,
- (bfd_size_type) count);
- if (!x)
- as_fatal (ngettext ("can't fill %ld byte "
- "in section %s of %s: '%s'",
- "can't fill %ld bytes "
- "in section %s of %s: '%s'",
- (long) count),
- (long) count,
- bfd_section_name (sec),
- bfd_get_filename (stdoutput),
- bfd_errmsg (bfd_get_error ()));
- offset += count;
- free (buf);
- }
- continue;
- }
- gas_assert (count >= 0);
- if (fill_size && count)
- {
- char buf[256];
- if (fill_size > sizeof (buf))
- {
- /* Do it the old way. Can this ever happen? */
- while (count--)
- {
- x = bfd_set_section_contents (stdoutput, sec,
- fill_literal,
- (file_ptr) offset,
- (bfd_size_type) fill_size);
- if (!x)
- as_fatal (ngettext ("can't fill %ld byte "
- "in section %s of %s: '%s'",
- "can't fill %ld bytes "
- "in section %s of %s: '%s'",
- (long) fill_size),
- (long) fill_size,
- bfd_section_name (sec),
- bfd_get_filename (stdoutput),
- bfd_errmsg (bfd_get_error ()));
- offset += fill_size;
- }
- }
- else
- {
- /* Build a buffer full of fill objects and output it as
- often as necessary. This saves on the overhead of
- potentially lots of bfd_set_section_contents calls. */
- int n_per_buf, i;
- if (fill_size == 1)
- {
- n_per_buf = sizeof (buf);
- memset (buf, *fill_literal, n_per_buf);
- }
- else
- {
- char *bufp;
- n_per_buf = sizeof (buf) / fill_size;
- for (i = n_per_buf, bufp = buf; i; i--, bufp += fill_size)
- memcpy (bufp, fill_literal, fill_size);
- }
- for (; count > 0; count -= n_per_buf)
- {
- n_per_buf = n_per_buf > count ? count : n_per_buf;
- x = bfd_set_section_contents
- (stdoutput, sec, buf, (file_ptr) offset,
- (bfd_size_type) n_per_buf * fill_size);
- if (!x)
- as_fatal (ngettext ("can't fill %ld byte "
- "in section %s of %s: '%s'",
- "can't fill %ld bytes "
- "in section %s of %s: '%s'",
- (long) (n_per_buf * fill_size)),
- (long) (n_per_buf * fill_size),
- bfd_section_name (sec),
- bfd_get_filename (stdoutput),
- bfd_errmsg (bfd_get_error ()));
- offset += n_per_buf * fill_size;
- }
- }
- }
- }
- }
- static void
- merge_data_into_text (void)
- {
- seg_info (text_section)->frchainP->frch_last->fr_next =
- seg_info (data_section)->frchainP->frch_root;
- seg_info (text_section)->frchainP->frch_last =
- seg_info (data_section)->frchainP->frch_last;
- seg_info (data_section)->frchainP = 0;
- }
- static void
- set_symtab (void)
- {
- int nsyms;
- asymbol **asympp;
- symbolS *symp;
- bool result;
- /* Count symbols. We can't rely on a count made by the loop in
- write_object_file, because *_frob_file may add a new symbol or
- two. Generate unused section symbols only if needed. */
- nsyms = 0;
- for (symp = symbol_rootP; symp; symp = symbol_next (symp))
- if (!symbol_removed_p (symp)
- && (bfd_keep_unused_section_symbols (stdoutput)
- || !symbol_section_p (symp)
- || symbol_used_in_reloc_p (symp)))
- nsyms++;
- if (nsyms)
- {
- int i;
- bfd_size_type amt = (bfd_size_type) nsyms * sizeof (asymbol *);
- asympp = (asymbol **) bfd_alloc (stdoutput, amt);
- symp = symbol_rootP;
- for (i = 0; i < nsyms; symp = symbol_next (symp))
- if (!symbol_removed_p (symp)
- && (bfd_keep_unused_section_symbols (stdoutput)
- || !symbol_section_p (symp)
- || symbol_used_in_reloc_p (symp)))
- {
- asympp[i] = symbol_get_bfdsym (symp);
- if (asympp[i]->flags != BSF_SECTION_SYM
- || !(bfd_is_const_section (asympp[i]->section)
- && asympp[i]->section->symbol == asympp[i]))
- asympp[i]->flags |= BSF_KEEP;
- symbol_mark_written (symp);
- /* Include this section symbol in the symbol table. */
- if (symbol_section_p (symp))
- asympp[i]->flags |= BSF_SECTION_SYM_USED;
- i++;
- }
- }
- else
- asympp = 0;
- result = bfd_set_symtab (stdoutput, asympp, nsyms);
- gas_assert (result);
- symbol_table_frozen = 1;
- }
- /* Finish the subsegments. After every sub-segment, we fake an
- ".align ...". This conforms to BSD4.2 brain-damage. We then fake
- ".fill 0" because that is the kind of frag that requires least
- thought. ".align" frags like to have a following frag since that
- makes calculating their intended length trivial. */
- #ifndef SUB_SEGMENT_ALIGN
- #ifdef HANDLE_ALIGN
- /* The last subsegment gets an alignment corresponding to the alignment
- of the section. This allows proper nop-filling at the end of
- code-bearing sections. */
- #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \
- (!(FRCHAIN)->frch_next && subseg_text_p (SEG) \
- && !do_not_pad_sections_to_alignment \
- ? get_recorded_alignment (SEG) \
- : 0)
- #else
- #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
- #endif
- #endif
- static void
- subsegs_finish_section (asection *s)
- {
- struct frchain *frchainP;
- segment_info_type *seginfo = seg_info (s);
- if (!seginfo)
- return;
- for (frchainP = seginfo->frchainP;
- frchainP != NULL;
- frchainP = frchainP->frch_next)
- {
- int alignment;
- subseg_set (s, frchainP->frch_subseg);
- /* This now gets called even if we had errors. In that case,
- any alignment is meaningless, and, moreover, will look weird
- if we are generating a listing. */
- if (had_errors ())
- do_not_pad_sections_to_alignment = 1;
- alignment = SUB_SEGMENT_ALIGN (now_seg, frchainP);
- if ((bfd_section_flags (now_seg) & SEC_MERGE)
- && now_seg->entsize)
- {
- unsigned int entsize = now_seg->entsize;
- int entalign = 0;
- while ((entsize & 1) == 0)
- {
- ++entalign;
- entsize >>= 1;
- }
- if (entalign > alignment)
- alignment = entalign;
- }
- if (subseg_text_p (now_seg))
- frag_align_code (alignment, 0);
- else
- frag_align (alignment, 0, 0);
- /* frag_align will have left a new frag.
- Use this last frag for an empty ".fill".
- For this segment ...
- Create a last frag. Do not leave a "being filled in frag". */
- frag_wane (frag_now);
- frag_now->fr_fix = 0;
- know (frag_now->fr_next == NULL);
- }
- }
- static void
- subsegs_finish (void)
- {
- asection *s;
- for (s = stdoutput->sections; s; s = s->next)
- subsegs_finish_section (s);
- }
- #ifdef OBJ_ELF
- static void
- create_obj_attrs_section (void)
- {
- segT s;
- char *p;
- offsetT size;
- const char *name;
- size = bfd_elf_obj_attr_size (stdoutput);
- if (size == 0)
- return;
- name = get_elf_backend_data (stdoutput)->obj_attrs_section;
- if (!name)
- name = ".gnu.attributes";
- s = subseg_new (name, 0);
- elf_section_type (s)
- = get_elf_backend_data (stdoutput)->obj_attrs_section_type;
- bfd_set_section_flags (s, SEC_READONLY | SEC_DATA);
- frag_now_fix ();
- p = frag_more (size);
- bfd_elf_set_obj_attr_contents (stdoutput, (bfd_byte *)p, size);
- subsegs_finish_section (s);
- relax_segment (seg_info (s)->frchainP->frch_root, s, 0);
- size_seg (stdoutput, s, NULL);
- }
- /* Create a relocation against an entry in a GNU Build attribute section. */
- static void
- create_note_reloc (segT sec,
- symbolS * sym,
- bfd_size_type note_offset,
- bfd_size_type desc2_offset,
- offsetT desc2_size,
- int reloc_type,
- bfd_vma addend,
- char * note)
- {
- struct reloc_list * reloc;
- reloc = XNEW (struct reloc_list);
- /* We create a .b type reloc as resolve_reloc_expr_symbols() has already been called. */
- reloc->u.b.sec = sec;
- reloc->u.b.s = symbol_get_bfdsym (sym);
- reloc->u.b.r.sym_ptr_ptr = & reloc->u.b.s;
- reloc->u.b.r.address = note_offset + desc2_offset;
- reloc->u.b.r.addend = addend;
- reloc->u.b.r.howto = bfd_reloc_type_lookup (stdoutput, reloc_type);
- if (reloc->u.b.r.howto == NULL)
- {
- as_bad (_("unable to create reloc for build note"));
- return;
- }
- reloc->file = N_("<gnu build note>");
- reloc->line = 0;
- reloc->next = reloc_list;
- reloc_list = reloc;
- /* For REL relocs, store the addend in the section. */
- if (! sec->use_rela_p
- /* The SH target is a special case that uses RELA relocs
- but still stores the addend in the word being relocated. */
- || strstr (bfd_get_target (stdoutput), "-sh") != NULL)
- {
- offsetT i;
- /* Zero out the addend, since it is now stored in the note. */
- reloc->u.b.r.addend = 0;
- if (target_big_endian)
- {
- for (i = desc2_size; addend != 0 && i > 0; addend >>= 8, i--)
- note[desc2_offset + i - 1] = (addend & 0xff);
- }
- else
- {
- for (i = 0; addend != 0 && i < desc2_size; addend >>= 8, i++)
- note[desc2_offset + i] = (addend & 0xff);
- }
- }
- }
- static void
- maybe_generate_build_notes (void)
- {
- segT sec;
- char * note;
- offsetT note_size;
- offsetT total_size;
- offsetT desc_size;
- offsetT desc2_offset;
- int desc_reloc;
- symbolS * sym;
- asymbol * bsym;
- if (! flag_generate_build_notes
- || bfd_get_section_by_name (stdoutput,
- GNU_BUILD_ATTRS_SECTION_NAME) != NULL)
- return;
- /* Create a GNU Build Attribute section. */
- sec = subseg_new (GNU_BUILD_ATTRS_SECTION_NAME, false);
- elf_section_type (sec) = SHT_NOTE;
- bfd_set_section_flags (sec, (SEC_READONLY | SEC_HAS_CONTENTS | SEC_DATA
- | SEC_OCTETS));
- bfd_set_section_alignment (sec, 2);
- /* Work out the size of the notes that we will create,
- and the relocation we should use. */
- if (bfd_arch_bits_per_address (stdoutput) <= 32)
- {
- note_size = 28;
- desc_size = 8; /* Two 4-byte offsets. */
- desc2_offset = 24;
- /* FIXME: The BFD backend for the CRX target does not support the
- BFD_RELOC_32, even though it really should. Likewise for the
- CR16 target. So we have special case code here... */
- if (strstr (bfd_get_target (stdoutput), "-crx") != NULL)
- desc_reloc = BFD_RELOC_CRX_NUM32;
- else if (strstr (bfd_get_target (stdoutput), "-cr16") != NULL)
- desc_reloc = BFD_RELOC_CR16_NUM32;
- else
- desc_reloc = BFD_RELOC_32;
- }
- else
- {
- note_size = 36;
- desc_size = 16; /* Two 8-byte offsets. */
- desc2_offset = 28;
- /* FIXME: The BFD backend for the IA64 target does not support the
- BFD_RELOC_64, even though it really should. The HPPA backend
- has a similar issue, although it does not support BFD_RELOCs at
- all! So we have special case code to handle these targets. */
- if (strstr (bfd_get_target (stdoutput), "-ia64") != NULL)
- desc_reloc = target_big_endian ? BFD_RELOC_IA64_DIR32MSB : BFD_RELOC_IA64_DIR32LSB;
- else if (strstr (bfd_get_target (stdoutput), "-hppa") != NULL)
- desc_reloc = 80; /* R_PARISC_DIR64. */
- else
- desc_reloc = BFD_RELOC_64;
- }
-
- /* We have to create a note for *each* code section.
- Linker garbage collection might discard some. */
- total_size = 0;
- note = NULL;
- for (sym = symbol_rootP; sym != NULL; sym = symbol_next (sym))
- if ((bsym = symbol_get_bfdsym (sym)) != NULL
- && bsym->flags & BSF_SECTION_SYM
- && bsym->section != NULL
- /* Skip linkonce sections - we cannot use these section symbols as they may disappear. */
- && (bsym->section->flags & (SEC_CODE | SEC_LINK_ONCE)) == SEC_CODE
- /* Not all linkonce sections are flagged... */
- && !startswith (S_GET_NAME (sym), ".gnu.linkonce"))
- {
- /* Create a version note. */
- frag_now_fix ();
- note = frag_more (note_size);
- memset (note, 0, note_size);
- if (target_big_endian)
- {
- note[3] = 8; /* strlen (name) + 1. */
- note[7] = desc_size; /* Two N-byte offsets. */
- note[10] = NT_GNU_BUILD_ATTRIBUTE_OPEN >> 8;
- note[11] = NT_GNU_BUILD_ATTRIBUTE_OPEN & 0xff;
- }
- else
- {
- note[0] = 8; /* strlen (name) + 1. */
- note[4] = desc_size; /* Two N-byte offsets. */
- note[8] = NT_GNU_BUILD_ATTRIBUTE_OPEN & 0xff;
- note[9] = NT_GNU_BUILD_ATTRIBUTE_OPEN >> 8;
- }
- /* The a1 version number indicates that this note was
- generated by the assembler and not the gcc annobin plugin. */
- memcpy (note + 12, "GA$3a1", 8);
- /* Create a relocation to install the start address of the note... */
- create_note_reloc (sec, sym, total_size, 20, desc_size / 2, desc_reloc, 0, note);
- /* ...and another one to install the end address. */
- create_note_reloc (sec, sym, total_size, desc2_offset,
- desc_size / 2,
- desc_reloc,
- bfd_section_size (bsym->section),
- note);
- /* Mark the section symbol used in relocation so that it will be
- included in the symbol table. */
- symbol_mark_used_in_reloc (sym);
- total_size += note_size;
- /* FIXME: Maybe add a note recording the assembler command line and version ? */
- }
- /* Install the note(s) into the section. */
- if (total_size)
- bfd_set_section_contents (stdoutput, sec, (bfd_byte *) note, 0, total_size);
- subsegs_finish_section (sec);
- relax_segment (seg_info (sec)->frchainP->frch_root, sec, 0);
- size_seg (stdoutput, sec, NULL);
- }
- #endif /* OBJ_ELF */
- /* Write the object file. */
- void
- write_object_file (void)
- {
- struct relax_seg_info rsi;
- #ifndef WORKING_DOT_WORD
- fragS *fragP; /* Track along all frags. */
- #endif
- subsegs_finish ();
- #ifdef md_pre_output_hook
- md_pre_output_hook;
- #endif
- #ifdef md_pre_relax_hook
- md_pre_relax_hook;
- #endif
- /* From now on, we don't care about sub-segments. Build one frag chain
- for each segment. Linked through fr_next. */
- /* Remove the sections created by gas for its own purposes. */
- {
- int i;
- bfd_section_list_remove (stdoutput, reg_section);
- bfd_section_list_remove (stdoutput, expr_section);
- stdoutput->section_count -= 2;
- i = 0;
- bfd_map_over_sections (stdoutput, renumber_sections, &i);
- }
- bfd_map_over_sections (stdoutput, chain_frchains_together, (char *) 0);
- /* We have two segments. If user gave -R flag, then we must put the
- data frags into the text segment. Do this before relaxing so
- we know to take advantage of -R and make shorter addresses. */
- if (flag_readonly_data_in_text)
- {
- merge_data_into_text ();
- }
- rsi.pass = 0;
- while (1)
- {
- #ifndef WORKING_DOT_WORD
- /* We need to reset the markers in the broken word list and
- associated frags between calls to relax_segment (via
- relax_seg). Since the broken word list is global, we do it
- once per round, rather than locally in relax_segment for each
- segment. */
- struct broken_word *brokp;
- for (brokp = broken_words;
- brokp != (struct broken_word *) NULL;
- brokp = brokp->next_broken_word)
- {
- brokp->added = 0;
- if (brokp->dispfrag != (fragS *) NULL
- && brokp->dispfrag->fr_type == rs_broken_word)
- brokp->dispfrag->fr_subtype = 0;
- }
- #endif
- rsi.changed = 0;
- bfd_map_over_sections (stdoutput, relax_seg, &rsi);
- rsi.pass++;
- if (!rsi.changed)
- break;
- }
- /* Note - Most ports will use the default value of
- TC_FINALIZE_SYMS_BEFORE_SIZE_SEG, which 1. This will force
- local symbols to be resolved, removing their frag information.
- Some ports however, will not have finished relaxing all of
- their frags and will still need the local symbol frag
- information. These ports can set
- TC_FINALIZE_SYMS_BEFORE_SIZE_SEG to 0. */
- finalize_syms = TC_FINALIZE_SYMS_BEFORE_SIZE_SEG;
- bfd_map_over_sections (stdoutput, size_seg, (char *) 0);
- /* Relaxation has completed. Freeze all syms. */
- finalize_syms = 1;
- dwarf2dbg_final_check ();
- #ifdef md_post_relax_hook
- md_post_relax_hook;
- #endif
- #ifdef OBJ_ELF
- if (IS_ELF)
- create_obj_attrs_section ();
- #endif
- #ifndef WORKING_DOT_WORD
- {
- struct broken_word *lie;
- struct broken_word **prevP;
- prevP = &broken_words;
- for (lie = broken_words; lie; lie = lie->next_broken_word)
- if (!lie->added)
- {
- expressionS exp;
- subseg_change (lie->seg, lie->subseg);
- exp.X_op = O_subtract;
- exp.X_add_symbol = lie->add;
- exp.X_op_symbol = lie->sub;
- exp.X_add_number = lie->addnum;
- #ifdef TC_CONS_FIX_NEW
- TC_CONS_FIX_NEW (lie->frag,
- lie->word_goes_here - lie->frag->fr_literal,
- 2, &exp, TC_PARSE_CONS_RETURN_NONE);
- #else
- fix_new_exp (lie->frag,
- lie->word_goes_here - lie->frag->fr_literal,
- 2, &exp, 0, BFD_RELOC_16);
- #endif
- *prevP = lie->next_broken_word;
- }
- else
- prevP = &(lie->next_broken_word);
- for (lie = broken_words; lie;)
- {
- struct broken_word *untruth;
- char *table_ptr;
- addressT table_addr;
- addressT from_addr, to_addr;
- int n, m;
- subseg_change (lie->seg, lie->subseg);
- fragP = lie->dispfrag;
- /* Find out how many broken_words go here. */
- n = 0;
- for (untruth = lie;
- untruth && untruth->dispfrag == fragP;
- untruth = untruth->next_broken_word)
- if (untruth->added == 1)
- n++;
- table_ptr = lie->dispfrag->fr_opcode;
- table_addr = (lie->dispfrag->fr_address
- + (table_ptr - lie->dispfrag->fr_literal));
- /* Create the jump around the long jumps. This is a short
- jump from table_ptr+0 to table_ptr+n*long_jump_size. */
- from_addr = table_addr;
- to_addr = table_addr + md_short_jump_size + n * md_long_jump_size;
- md_create_short_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
- lie->add);
- table_ptr += md_short_jump_size;
- table_addr += md_short_jump_size;
- for (m = 0;
- lie && lie->dispfrag == fragP;
- m++, lie = lie->next_broken_word)
- {
- if (lie->added == 2)
- continue;
- /* Patch the jump table. */
- for (untruth = (struct broken_word *) (fragP->fr_symbol);
- untruth && untruth->dispfrag == fragP;
- untruth = untruth->next_broken_word)
- {
- if (untruth->use_jump == lie)
- {
- /* This is the offset from ??? to table_ptr+0.
- The target is the same for all users of this
- md_long_jump, but the "sub" bases (and hence the
- offsets) may be different. */
- addressT to_word = table_addr - S_GET_VALUE (untruth->sub);
- #ifdef TC_CHECK_ADJUSTED_BROKEN_DOT_WORD
- TC_CHECK_ADJUSTED_BROKEN_DOT_WORD (to_word, untruth);
- #endif
- md_number_to_chars (untruth->word_goes_here, to_word, 2);
- }
- }
- /* Install the long jump. */
- /* This is a long jump from table_ptr+0 to the final target. */
- from_addr = table_addr;
- to_addr = S_GET_VALUE (lie->add) + lie->addnum;
- md_create_long_jump (table_ptr, from_addr, to_addr, lie->dispfrag,
- lie->add);
- table_ptr += md_long_jump_size;
- table_addr += md_long_jump_size;
- }
- }
- }
- #endif /* not WORKING_DOT_WORD */
- /* Resolve symbol values. This needs to be done before processing
- the relocations. */
- if (symbol_rootP)
- {
- symbolS *symp;
- for (symp = symbol_rootP; symp; symp = symbol_next (symp))
- resolve_symbol_value (symp);
- }
- resolve_local_symbol_values ();
- resolve_reloc_expr_symbols ();
- #ifdef OBJ_ELF
- if (IS_ELF)
- maybe_generate_build_notes ();
- #endif
- PROGRESS (1);
- #ifdef tc_frob_file_before_adjust
- tc_frob_file_before_adjust ();
- #endif
- #ifdef obj_frob_file_before_adjust
- obj_frob_file_before_adjust ();
- #endif
- bfd_map_over_sections (stdoutput, adjust_reloc_syms, (char *) 0);
- #ifdef tc_frob_file_before_fix
- tc_frob_file_before_fix ();
- #endif
- #ifdef obj_frob_file_before_fix
- obj_frob_file_before_fix ();
- #endif
- bfd_map_over_sections (stdoutput, fix_segment, (char *) 0);
- /* Set up symbol table, and write it out. */
- if (symbol_rootP)
- {
- symbolS *symp;
- bool skip_next_symbol = false;
- for (symp = symbol_rootP; symp; symp = symbol_next (symp))
- {
- int punt = 0;
- const char *name;
- if (skip_next_symbol)
- {
- /* Don't do anything besides moving the value of the
- symbol from the GAS value-field to the BFD value-field. */
- symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
- skip_next_symbol = false;
- continue;
- }
- if (symbol_mri_common_p (symp))
- {
- if (S_IS_EXTERNAL (symp))
- as_bad (_("%s: global symbols not supported in common sections"),
- S_GET_NAME (symp));
- symbol_remove (symp, &symbol_rootP, &symbol_lastP);
- continue;
- }
- name = S_GET_NAME (symp);
- if (name)
- {
- const char *name2 =
- decode_local_label_name ((char *) S_GET_NAME (symp));
- /* They only differ if `name' is a fb or dollar local
- label name. */
- if (name2 != name && ! S_IS_DEFINED (symp))
- as_bad (_("local label `%s' is not defined"), name2);
- }
- /* Do it again, because adjust_reloc_syms might introduce
- more symbols. They'll probably only be section symbols,
- but they'll still need to have the values computed. */
- resolve_symbol_value (symp);
- /* Skip symbols which were equated to undefined or common
- symbols. */
- if (symbol_equated_reloc_p (symp)
- || S_IS_WEAKREFR (symp))
- {
- const char *sname = S_GET_NAME (symp);
- if (S_IS_COMMON (symp)
- && !TC_FAKE_LABEL (sname)
- && !S_IS_WEAKREFR (symp))
- {
- expressionS *e = symbol_get_value_expression (symp);
- as_bad (_("`%s' can't be equated to common symbol `%s'"),
- sname, S_GET_NAME (e->X_add_symbol));
- }
- if (S_GET_SEGMENT (symp) == reg_section)
- {
- /* Report error only if we know the symbol name. */
- if (S_GET_NAME (symp) != reg_section->name)
- as_bad (_("can't make global register symbol `%s'"),
- sname);
- }
- symbol_remove (symp, &symbol_rootP, &symbol_lastP);
- continue;
- }
- #ifdef obj_frob_symbol
- obj_frob_symbol (symp, punt);
- #endif
- #ifdef tc_frob_symbol
- if (! punt || symbol_used_in_reloc_p (symp))
- tc_frob_symbol (symp, punt);
- #endif
- /* If we don't want to keep this symbol, splice it out of
- the chain now. If EMIT_SECTION_SYMBOLS is 0, we never
- want section symbols. Otherwise, we skip local symbols
- and symbols that the frob_symbol macros told us to punt,
- but we keep such symbols if they are used in relocs. */
- if (symp == abs_section_sym
- || (! EMIT_SECTION_SYMBOLS
- && symbol_section_p (symp))
- /* Note that S_IS_EXTERNAL and S_IS_LOCAL are not always
- opposites. Sometimes the former checks flags and the
- latter examines the name... */
- || (!S_IS_EXTERNAL (symp)
- && (punt || S_IS_LOCAL (symp) ||
- (S_IS_WEAKREFD (symp) && ! symbol_used_p (symp)))
- && ! symbol_used_in_reloc_p (symp)))
- {
- symbol_remove (symp, &symbol_rootP, &symbol_lastP);
- /* After symbol_remove, symbol_next(symp) still returns
- the one that came after it in the chain. So we don't
- need to do any extra cleanup work here. */
- continue;
- }
- /* Make sure we really got a value for the symbol. */
- if (! symbol_resolved_p (symp))
- {
- as_bad (_("can't resolve value for symbol `%s'"),
- S_GET_NAME (symp));
- symbol_mark_resolved (symp);
- }
- /* Set the value into the BFD symbol. Up til now the value
- has only been kept in the gas symbolS struct. */
- symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp);
- /* A warning construct is a warning symbol followed by the
- symbol warned about. Don't let anything object-format or
- target-specific muck with it; it's ready for output. */
- if (symbol_get_bfdsym (symp)->flags & BSF_WARNING)
- skip_next_symbol = true;
- }
- }
- PROGRESS (1);
- /* Now do any format-specific adjustments to the symbol table, such
- as adding file symbols. */
- #ifdef tc_adjust_symtab
- tc_adjust_symtab ();
- #endif
- #ifdef obj_adjust_symtab
- obj_adjust_symtab ();
- #endif
- /* Stop if there is an error. */
- if (!flag_always_generate_output && had_errors ())
- return;
- /* Now that all the sizes are known, and contents correct, we can
- start writing to the file. */
- set_symtab ();
- /* If *_frob_file changes the symbol value at this point, it is
- responsible for moving the changed value into symp->bsym->value
- as well. Hopefully all symbol value changing can be done in
- *_frob_symbol. */
- #ifdef tc_frob_file
- tc_frob_file ();
- #endif
- #ifdef obj_frob_file
- obj_frob_file ();
- #endif
- #ifdef obj_coff_generate_pdata
- obj_coff_generate_pdata ();
- #endif
- bfd_map_over_sections (stdoutput, write_relocs, (char *) 0);
- #ifdef tc_frob_file_after_relocs
- tc_frob_file_after_relocs ();
- #endif
- #ifdef obj_frob_file_after_relocs
- obj_frob_file_after_relocs ();
- #endif
- #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
- if (IS_ELF && flag_use_elf_stt_common)
- stdoutput->flags |= BFD_CONVERT_ELF_COMMON | BFD_USE_ELF_STT_COMMON;
- #endif
- /* Once all relocations have been written, we can compress the
- contents of the debug sections. This needs to be done before
- we start writing any sections, because it will affect the file
- layout, which is fixed once we start writing contents. */
- if (flag_compress_debug)
- {
- if (flag_compress_debug == COMPRESS_DEBUG_GABI_ZLIB)
- stdoutput->flags |= BFD_COMPRESS | BFD_COMPRESS_GABI;
- else
- stdoutput->flags |= BFD_COMPRESS;
- bfd_map_over_sections (stdoutput, compress_debug, (char *) 0);
- }
- bfd_map_over_sections (stdoutput, write_contents, (char *) 0);
- }
- #ifdef TC_GENERIC_RELAX_TABLE
- #ifndef md_generic_table_relax_frag
- #define md_generic_table_relax_frag relax_frag
- #endif
- /* Relax a fragment by scanning TC_GENERIC_RELAX_TABLE. */
- long
- relax_frag (segT segment, fragS *fragP, long stretch)
- {
- const relax_typeS *this_type;
- const relax_typeS *start_type;
- relax_substateT next_state;
- relax_substateT this_state;
- offsetT growth;
- offsetT aim;
- addressT target;
- addressT address;
- symbolS *symbolP;
- const relax_typeS *table;
- target = fragP->fr_offset;
- address = fragP->fr_address + fragP->fr_fix;
- table = TC_GENERIC_RELAX_TABLE;
- this_state = fragP->fr_subtype;
- start_type = this_type = table + this_state;
- symbolP = fragP->fr_symbol;
- if (symbolP)
- {
- fragS *sym_frag;
- sym_frag = symbol_get_frag (symbolP);
- #ifndef DIFF_EXPR_OK
- know (sym_frag != NULL);
- #endif
- know (S_GET_SEGMENT (symbolP) != absolute_section
- || sym_frag == &zero_address_frag);
- target += S_GET_VALUE (symbolP);
- /* If SYM_FRAG has yet to be reached on this pass, assume it
- will move by STRETCH just as we did, unless there is an
- alignment frag between here and SYM_FRAG. An alignment may
- well absorb any STRETCH, and we don't want to choose a larger
- branch insn by overestimating the needed reach of this
- branch. It isn't critical to calculate TARGET exactly; We
- know we'll be doing another pass if STRETCH is non-zero. */
- if (stretch != 0
- && sym_frag->relax_marker != fragP->relax_marker
- && S_GET_SEGMENT (symbolP) == segment)
- {
- if (stretch < 0
- || sym_frag->region == fragP->region)
- target += stretch;
- /* If we get here we know we have a forward branch. This
- relax pass may have stretched previous instructions so
- far that omitting STRETCH would make the branch
- negative. Don't allow this in case the negative reach is
- large enough to require a larger branch instruction. */
- else if (target < address)
- return 0;
- }
- }
- aim = target - address;
- #ifdef TC_PCREL_ADJUST
- /* Currently only the ns32k and arc needs this. */
- aim += TC_PCREL_ADJUST (fragP);
- #endif
- #ifdef md_prepare_relax_scan
- /* Formerly called M68K_AIM_KLUDGE. */
- md_prepare_relax_scan (fragP, address, aim, this_state, this_type);
- #endif
- if (aim < 0)
- {
- /* Look backwards. */
- for (next_state = this_type->rlx_more; next_state;)
- if (aim >= this_type->rlx_backward)
- next_state = 0;
- else
- {
- /* Grow to next state. */
- this_state = next_state;
- this_type = table + this_state;
- next_state = this_type->rlx_more;
- }
- }
- else
- {
- /* Look forwards. */
- for (next_state = this_type->rlx_more; next_state;)
- if (aim <= this_type->rlx_forward)
- next_state = 0;
- else
- {
- /* Grow to next state. */
- this_state = next_state;
- this_type = table + this_state;
- next_state = this_type->rlx_more;
- }
- }
- growth = this_type->rlx_length - start_type->rlx_length;
- if (growth != 0)
- fragP->fr_subtype = this_state;
- return growth;
- }
- #endif /* defined (TC_GENERIC_RELAX_TABLE) */
- /* Relax_align. Advance location counter to next address that has 'alignment'
- lowest order bits all 0s, return size of adjustment made. */
- static relax_addressT
- relax_align (relax_addressT address, /* Address now. */
- int alignment /* Alignment (binary). */)
- {
- relax_addressT mask;
- relax_addressT new_address;
- mask = ~((relax_addressT) ~0 << alignment);
- new_address = (address + mask) & (~mask);
- #ifdef LINKER_RELAXING_SHRINKS_ONLY
- if (linkrelax)
- /* We must provide lots of padding, so the linker can discard it
- when needed. The linker will not add extra space, ever. */
- new_address += (1 << alignment);
- #endif
- return (new_address - address);
- }
- /* Now we have a segment, not a crowd of sub-segments, we can make
- fr_address values.
- Relax the frags.
- After this, all frags in this segment have addresses that are correct
- within the segment. Since segments live in different file addresses,
- these frag addresses may not be the same as final object-file
- addresses. */
- int
- relax_segment (struct frag *segment_frag_root, segT segment, int pass)
- {
- unsigned long frag_count;
- struct frag *fragP;
- relax_addressT address;
- int region;
- int ret;
- /* In case md_estimate_size_before_relax() wants to make fixSs. */
- subseg_change (segment, 0);
- /* For each frag in segment: count and store (a 1st guess of)
- fr_address. */
- address = 0;
- region = 0;
- for (frag_count = 0, fragP = segment_frag_root;
- fragP;
- fragP = fragP->fr_next, frag_count ++)
- {
- fragP->region = region;
- fragP->relax_marker = 0;
- fragP->fr_address = address;
- address += fragP->fr_fix;
- switch (fragP->fr_type)
- {
- case rs_fill:
- address += fragP->fr_offset * fragP->fr_var;
- break;
- case rs_align:
- case rs_align_code:
- case rs_align_test:
- {
- addressT offset = relax_align (address, (int) fragP->fr_offset);
- if (fragP->fr_subtype != 0 && offset > fragP->fr_subtype)
- offset = 0;
- if (offset % fragP->fr_var != 0)
- {
- as_bad_where (fragP->fr_file, fragP->fr_line,
- ngettext ("alignment padding (%lu byte) "
- "not a multiple of %ld",
- "alignment padding (%lu bytes) "
- "not a multiple of %ld",
- (unsigned long) offset),
- (unsigned long) offset, (long) fragP->fr_var);
- offset -= (offset % fragP->fr_var);
- }
- address += offset;
- region += 1;
- }
- break;
- case rs_org:
- /* Assume .org is nugatory. It will grow with 1st relax. */
- region += 1;
- break;
- case rs_space:
- case rs_space_nop:
- break;
- case rs_machine_dependent:
- /* If fr_symbol is an expression, this call to
- resolve_symbol_value sets up the correct segment, which will
- likely be needed in md_estimate_size_before_relax. */
- if (fragP->fr_symbol)
- resolve_symbol_value (fragP->fr_symbol);
- address += md_estimate_size_before_relax (fragP, segment);
- break;
- #ifndef WORKING_DOT_WORD
- /* Broken words don't concern us yet. */
- case rs_broken_word:
- break;
- #endif
- case rs_leb128:
- /* Initial guess is always 1; doing otherwise can result in
- stable solutions that are larger than the minimum. */
- address += fragP->fr_offset = 1;
- break;
- case rs_cfa:
- address += eh_frame_estimate_size_before_relax (fragP);
- break;
- case rs_dwarf2dbg:
- address += dwarf2dbg_estimate_size_before_relax (fragP);
- break;
- default:
- BAD_CASE (fragP->fr_type);
- break;
- }
- }
- /* Do relax(). */
- {
- unsigned long max_iterations;
- /* Cumulative address adjustment. */
- offsetT stretch;
- /* Have we made any adjustment this pass? We can't just test
- stretch because one piece of code may have grown and another
- shrank. */
- int stretched;
- /* Most horrible, but gcc may give us some exception data that
- is impossible to assemble, of the form
- .align 4
- .byte 0, 0
- .uleb128 end - start
- start:
- .space 128*128 - 1
- .align 4
- end:
- If the leb128 is two bytes in size, then end-start is 128*128,
- which requires a three byte leb128. If the leb128 is three
- bytes in size, then end-start is 128*128-1, which requires a
- two byte leb128. We work around this dilemma by inserting
- an extra 4 bytes of alignment just after the .align. This
- works because the data after the align is accessed relative to
- the end label.
- This counter is used in a tiny state machine to detect
- whether a leb128 followed by an align is impossible to
- relax. */
- int rs_leb128_fudge = 0;
- /* We want to prevent going into an infinite loop where one frag grows
- depending upon the location of a symbol which is in turn moved by
- the growing frag. eg:
- foo = .
- .org foo+16
- foo = .
- So we dictate that this algorithm can be at most O2. */
- max_iterations = frag_count * frag_count;
- /* Check for overflow. */
- if (max_iterations < frag_count)
- max_iterations = frag_count;
- ret = 0;
- do
- {
- stretch = 0;
- stretched = 0;
- for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
- {
- offsetT growth = 0;
- addressT was_address;
- offsetT offset;
- symbolS *symbolP;
- fragP->relax_marker ^= 1;
- was_address = fragP->fr_address;
- address = fragP->fr_address += stretch;
- symbolP = fragP->fr_symbol;
- offset = fragP->fr_offset;
- switch (fragP->fr_type)
- {
- case rs_fill: /* .fill never relaxes. */
- growth = 0;
- break;
- #ifndef WORKING_DOT_WORD
- /* JF: This is RMS's idea. I do *NOT* want to be blamed
- for it I do not want to write it. I do not want to have
- anything to do with it. This is not the proper way to
- implement this misfeature. */
- case rs_broken_word:
- {
- struct broken_word *lie;
- struct broken_word *untruth;
- /* Yes this is ugly (storing the broken_word pointer
- in the symbol slot). Still, this whole chunk of
- code is ugly, and I don't feel like doing anything
- about it. Think of it as stubbornness in action. */
- growth = 0;
- for (lie = (struct broken_word *) (fragP->fr_symbol);
- lie && lie->dispfrag == fragP;
- lie = lie->next_broken_word)
- {
- if (lie->added)
- continue;
- offset = (S_GET_VALUE (lie->add)
- + lie->addnum
- - S_GET_VALUE (lie->sub));
- if (offset <= -32768 || offset >= 32767)
- {
- if (flag_warn_displacement)
- {
- char buf[50];
- bfd_sprintf_vma (stdoutput, buf,
- (addressT) lie->addnum);
- as_warn_where (fragP->fr_file, fragP->fr_line,
- _(".word %s-%s+%s didn't fit"),
- S_GET_NAME (lie->add),
- S_GET_NAME (lie->sub),
- buf);
- }
- if (fragP->fr_subtype == 0)
- {
- fragP->fr_subtype++;
- growth += md_short_jump_size;
- }
- /* Redirect *all* words of this table with the same
- target, lest we have to handle the case where the
- same target but with a offset that fits on this
- round overflows at the next relaxation round. */
- for (untruth = (struct broken_word *) (fragP->fr_symbol);
- untruth && untruth->dispfrag == lie->dispfrag;
- untruth = untruth->next_broken_word)
- if ((symbol_get_frag (untruth->add)
- == symbol_get_frag (lie->add))
- && (S_GET_VALUE (untruth->add)
- == S_GET_VALUE (lie->add)))
- {
- untruth->added = 2;
- untruth->use_jump = lie;
- }
- lie->added = 1;
- growth += md_long_jump_size;
- }
- }
- break;
- } /* case rs_broken_word */
- #endif
- case rs_align:
- case rs_align_code:
- case rs_align_test:
- {
- addressT oldoff, newoff;
- oldoff = relax_align (was_address + fragP->fr_fix,
- (int) offset);
- newoff = relax_align (address + fragP->fr_fix,
- (int) offset);
- if (fragP->fr_subtype != 0)
- {
- if (oldoff > fragP->fr_subtype)
- oldoff = 0;
- if (newoff > fragP->fr_subtype)
- newoff = 0;
- }
- growth = newoff - oldoff;
- /* If this align happens to follow a leb128 and
- we have determined that the leb128 is bouncing
- in size, then break the cycle by inserting an
- extra alignment. */
- if (growth < 0
- && (rs_leb128_fudge & 16) != 0
- && (rs_leb128_fudge & 15) >= 2)
- {
- segment_info_type *seginfo = seg_info (segment);
- struct obstack *ob = &seginfo->frchainP->frch_obstack;
- struct frag *newf;
- newf = frag_alloc (ob);
- obstack_blank_fast (ob, fragP->fr_var);
- obstack_finish (ob);
- memcpy (newf, fragP, SIZEOF_STRUCT_FRAG);
- memcpy (newf->fr_literal,
- fragP->fr_literal + fragP->fr_fix,
- fragP->fr_var);
- newf->fr_type = rs_fill;
- newf->fr_address = address + fragP->fr_fix + newoff;
- newf->fr_fix = 0;
- newf->fr_offset = (((offsetT) 1 << fragP->fr_offset)
- / fragP->fr_var);
- if (newf->fr_offset * newf->fr_var
- != (offsetT) 1 << fragP->fr_offset)
- {
- newf->fr_offset = (offsetT) 1 << fragP->fr_offset;
- newf->fr_var = 1;
- }
- /* Include size of new frag in GROWTH. */
- growth += newf->fr_offset * newf->fr_var;
- /* Adjust the new frag address for the amount
- we'll add when we process the new frag. */
- newf->fr_address -= stretch + growth;
- newf->relax_marker ^= 1;
- fragP->fr_next = newf;
- #ifdef DEBUG
- as_warn (_("padding added"));
- #endif
- }
- }
- break;
- case rs_org:
- {
- offsetT target = offset;
- addressT after;
- if (symbolP)
- {
- /* Convert from an actual address to an octet offset
- into the section. Here it is assumed that the
- section's VMA is zero, and can omit subtracting it
- from the symbol's value to get the address offset. */
- know (S_GET_SEGMENT (symbolP)->vma == 0);
- target += S_GET_VALUE (symbolP) * OCTETS_PER_BYTE;
- }
- know (fragP->fr_next);
- after = fragP->fr_next->fr_address + stretch;
- growth = target - after;
- /* Growth may be negative, but variable part of frag
- cannot have fewer than 0 chars. That is, we can't
- .org backwards. */
- if ((offsetT) (address + fragP->fr_fix) > target)
- {
- growth = 0;
- /* Don't error on first few frag relax passes.
- The symbol might be an expression involving
- symbol values from other sections. If those
- sections have not yet been processed their
- frags will all have zero addresses, so we
- will calculate incorrect values for them. The
- number of passes we allow before giving an
- error is somewhat arbitrary. It should be at
- least one, with larger values requiring
- increasingly contrived dependencies between
- frags to trigger a false error. */
- if (pass < 2)
- {
- /* Force another pass. */
- ret = 1;
- break;
- }
- as_bad_where (fragP->fr_file, fragP->fr_line,
- _("attempt to move .org backwards"));
- /* We've issued an error message. Change the
- frag to avoid cascading errors. */
- fragP->fr_type = rs_align;
- fragP->fr_subtype = 0;
- fragP->fr_offset = 0;
- fragP->fr_fix = after - address;
- }
- }
- break;
- case rs_space:
- case rs_space_nop:
- growth = 0;
- if (symbolP)
- {
- offsetT amount;
- amount = S_GET_VALUE (symbolP);
- if (S_GET_SEGMENT (symbolP) != absolute_section
- || S_IS_COMMON (symbolP)
- || ! S_IS_DEFINED (symbolP))
- {
- as_bad_where (fragP->fr_file, fragP->fr_line,
- _(".space, .nops or .fill specifies non-absolute value"));
- /* Prevent repeat of this error message. */
- fragP->fr_symbol = 0;
- }
- else if (amount < 0)
- {
- /* Don't error on first few frag relax passes.
- See rs_org comment for a longer explanation. */
- if (pass < 2)
- {
- ret = 1;
- break;
- }
- as_warn_where (fragP->fr_file, fragP->fr_line,
- _(".space, .nops or .fill with negative value, ignored"));
- fragP->fr_symbol = 0;
- }
- else
- growth = (was_address + fragP->fr_fix + amount
- - fragP->fr_next->fr_address);
- }
- break;
- case rs_machine_dependent:
- #ifdef md_relax_frag
- growth = md_relax_frag (segment, fragP, stretch);
- #else
- #ifdef TC_GENERIC_RELAX_TABLE
- /* The default way to relax a frag is to look through
- TC_GENERIC_RELAX_TABLE. */
- growth = md_generic_table_relax_frag (segment, fragP,
- stretch);
- #endif /* TC_GENERIC_RELAX_TABLE */
- #endif
- break;
- case rs_leb128:
- {
- valueT value;
- offsetT size;
- value = resolve_symbol_value (fragP->fr_symbol);
- size = sizeof_leb128 (value, fragP->fr_subtype);
- growth = size - fragP->fr_offset;
- fragP->fr_offset = size;
- }
- break;
- case rs_cfa:
- growth = eh_frame_relax_frag (fragP);
- break;
- case rs_dwarf2dbg:
- growth = dwarf2dbg_relax_frag (fragP);
- break;
- default:
- BAD_CASE (fragP->fr_type);
- break;
- }
- if (growth)
- {
- stretch += growth;
- stretched = 1;
- if (fragP->fr_type == rs_leb128)
- rs_leb128_fudge += 16;
- else if (fragP->fr_type == rs_align
- && (rs_leb128_fudge & 16) != 0
- && stretch == 0)
- rs_leb128_fudge += 16;
- else
- rs_leb128_fudge = 0;
- }
- }
- if (stretch == 0
- && (rs_leb128_fudge & 16) == 0
- && (rs_leb128_fudge & -16) != 0)
- rs_leb128_fudge += 1;
- else
- rs_leb128_fudge = 0;
- }
- /* Until nothing further to relax. */
- while (stretched && -- max_iterations);
- if (stretched)
- as_fatal (_("Infinite loop encountered whilst attempting to compute the addresses of symbols in section %s"),
- segment_name (segment));
- }
- for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
- if (fragP->last_fr_address != fragP->fr_address)
- {
- fragP->last_fr_address = fragP->fr_address;
- ret = 1;
- }
- return ret;
- }
- void
- number_to_chars_bigendian (char *buf, valueT val, int n)
- {
- if (n <= 0)
- abort ();
- while (n--)
- {
- buf[n] = val & 0xff;
- val >>= 8;
- }
- }
- void
- number_to_chars_littleendian (char *buf, valueT val, int n)
- {
- if (n <= 0)
- abort ();
- while (n--)
- {
- *buf++ = val & 0xff;
- val >>= 8;
- }
- }
- void
- write_print_statistics (FILE *file)
- {
- fprintf (file, "fixups: %d\n", n_fixups);
- }
- /* For debugging. */
- extern int indent_level;
- void
- print_fixup (fixS *fixp)
- {
- indent_level = 1;
- fprintf (stderr, "fix ");
- fprintf_vma (stderr, (bfd_vma)((bfd_hostptr_t) fixp));
- fprintf (stderr, " %s:%d",fixp->fx_file, fixp->fx_line);
- if (fixp->fx_pcrel)
- fprintf (stderr, " pcrel");
- if (fixp->fx_pcrel_adjust)
- fprintf (stderr, " pcrel_adjust=%d", fixp->fx_pcrel_adjust);
- if (fixp->fx_tcbit)
- fprintf (stderr, " tcbit");
- if (fixp->fx_done)
- fprintf (stderr, " done");
- fprintf (stderr, "\n size=%d frag=", fixp->fx_size);
- fprintf_vma (stderr, (bfd_vma) ((bfd_hostptr_t) fixp->fx_frag));
- fprintf (stderr, " where=%ld offset=%lx addnumber=%lx",
- (long) fixp->fx_where,
- (unsigned long) fixp->fx_offset,
- (unsigned long) fixp->fx_addnumber);
- fprintf (stderr, "\n %s (%d)", bfd_get_reloc_code_name (fixp->fx_r_type),
- fixp->fx_r_type);
- if (fixp->fx_addsy)
- {
- fprintf (stderr, "\n +<");
- print_symbol_value_1 (stderr, fixp->fx_addsy);
- fprintf (stderr, ">");
- }
- if (fixp->fx_subsy)
- {
- fprintf (stderr, "\n -<");
- print_symbol_value_1 (stderr, fixp->fx_subsy);
- fprintf (stderr, ">");
- }
- fprintf (stderr, "\n");
- #ifdef TC_FIX_DATA_PRINT
- TC_FIX_DATA_PRINT (stderr, fixp);
- #endif
- }
|