xref: /illumos-gate/usr/src/cmd/sgs/libld/common/_libld.h (revision 4ba5c7f8)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  *	Copyright (c) 1988 AT&T
24  *	  All Rights Reserved
25  *
26  * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
27  */
28 
29 /*
30  * Local include file for ld library.
31  */
32 
33 #ifndef	_LIBLD_DOT_H
34 #define	_LIBLD_DOT_H
35 
36 #include <libld.h>
37 #include <_libelf.h>
38 #include <debug.h>
39 #include <conv.h>
40 #include <msg.h>
41 #include <reloc_defs.h>
42 
43 #ifdef	__cplusplus
44 extern "C" {
45 #endif
46 
47 /*
48  * In order to allow for cross linking, we need to be able to build
49  * libld with support for multiple targets within a single object.
50  * This is done using a global variable (ld_targ) of type Target to
51  * access target-specific code for the current target via indirection.
52  */
53 
54 /*
55  * Machine information for target
56  */
57 typedef struct {
58 	Half		m_mach;		/* ELF machine code for target */
59 	Half		m_machplus;	/* Alt ELF machine code for target */
60 					/*	Used for EM_SPARC32PLUS */
61 	Word		m_flagsplus;	/* ELF header flags used to identify */
62 					/*	a machplus object */
63 	uchar_t		m_class;	/* Target ELFCLASS */
64 	uchar_t		m_data;		/* Target byte order */
65 
66 	Xword		m_segm_align;	/* segment alignment */
67 	Xword		m_segm_origin;	/* Default 1st segment origin */
68 	Xword		m_segm_aorigin;	/* Alternative 1st segment origin */
69 	Word		m_dataseg_perm;	/* data segment permission mask */
70 	Word		m_stack_perm;	/* ABI default stack permission mask */
71 	Word		m_word_align;	/* alignment to use for Word sections */
72 	const char	*m_def_interp;	/* Def. interpreter for dyn objects */
73 
74 	/* Relocation type codes */
75 	Word		m_r_arrayaddr;
76 	Word		m_r_copy;
77 	Word		m_r_glob_dat;
78 	Word		m_r_jmp_slot;
79 	Word		m_r_num;
80 	Word		m_r_none;
81 	Word		m_r_relative;
82 	Word		m_r_register;
83 
84 	/* Relocation related constants */
85 	Word		m_rel_dt_count;	/* Either DT_REL or DT_RELA */
86 	Word		m_rel_dt_ent;	/* Either DT_RELENT or DT_RELAENT */
87 	Word		m_rel_dt_size;	/* Either DT_RELSZ or DT_RELASZ */
88 	Word		m_rel_dt_type;	/* Either DT_RELCOUNT or DT_RELACOUNT */
89 	Word		m_rel_sht_type;	/* Either SHT_REL or SHT_RELA */
90 
91 	/* GOT related constants */
92 	Word		m_got_entsize;
93 	Word		m_got_xnumber;	/* reserved # of got ents */
94 
95 	/* PLT related constants */
96 	Word		m_plt_align;
97 	Word		m_plt_entsize;
98 	Word		m_plt_reservsz;
99 	Word		m_plt_shf_flags;
100 
101 	/* Section type of .eh_frame/.eh_frame_hdr sections */
102 	Word		m_sht_unwind;
103 
104 	Word		m_dt_register;
105 } Target_mach;
106 
107 
108 /*
109  * Section identifiers, used to order sections in output object
110  */
111 typedef struct {
112 	Word		id_array;
113 	Word		id_bss;
114 	Word		id_cap;
115 	Word		id_capinfo;
116 	Word		id_capchain;
117 	Word		id_data;
118 	Word		id_dynamic;
119 	Word		id_dynsort;
120 	Word		id_dynstr;
121 	Word		id_dynsym;
122 	Word		id_dynsym_ndx;
123 	Word		id_got;
124 	Word		id_gotdata;
125 	Word		id_hash;
126 	Word		id_interp;
127 	Word		id_lbss;
128 	Word		id_ldynsym;
129 	Word		id_note;
130 	Word		id_null;
131 	Word		id_plt;
132 	Word		id_rel;
133 	Word		id_strtab;
134 	Word		id_syminfo;
135 	Word		id_symtab;
136 	Word		id_symtab_ndx;
137 	Word		id_text;
138 	Word		id_tls;
139 	Word		id_tlsbss;
140 	Word		id_unknown;
141 	Word		id_unwind;
142 	Word		id_unwindhdr;
143 	Word		id_user;
144 	Word		id_version;
145 } Target_machid;
146 
147 /*
148  * Target_nullfunc supplies machine code for generating a
149  *
150  *	void (*)(void)
151  *
152  * unnamed function. Such a function can be called, and returns
153  * immediately without doing any work. This is used to back FUNC
154  * symbol definitions added with a mapfile.
155  *
156  * The machine instructions are specified as an array of bytes rather
157  * than a larger integer type in order to avoid byte order issues that
158  * can otherwise occur in cross linking.
159  */
160 typedef struct {
161 	const uchar_t	*nf_template;	/* Array of machine inst. bytes */
162 	size_t		nf_size;	/* # bytes in nf_template */
163 } Target_nullfunc;
164 
165 /*
166  * Target_fill supplies machine code for fill bytes in executable output
167  * sections. Normally, libelf fills the gaps caused by alignment and size
168  * requirements of the constituent input sections with 0. Depending on the
169  * target architecture, it may be desirable to instead fill with executable
170  * NOP instructions. There are two reasons to do this:
171  *
172  *  -	So that .init/.fini sections will not contain unexecutable gaps
173  *	that cause the executing program to trap and die.
174  *
175  *  -	To eliminate confusing garbage instructions between sections containing
176  *	executable code when viewed with a disassembler.
177  *
178  * The ff_execfill function is allowed to be NULL if the underlying target
179  * does not require a special fill for executable sections.
180  */
181 typedef struct {
182 	_elf_execfill_func_t	*ff_execfill;
183 } Target_fillfunc;
184 
185 /*
186  * Target_machrel holds pointers to the reloc_table and machrel functions
187  * for a given target machine.
188  *
189  * The following function pointers are allowed to be NULL, if the
190  * underlying target does not require the specified operation. All
191  * other functions must be supplied:
192  *
193  *	mr_assign_got
194  *	mr_reloc_register
195  *	mr_reloc_GOTOP
196  *	mr_allocate_got
197  */
198 typedef struct {
199 	const Rel_entry	*mr_reloc_table;
200 
201 	Word		(* mr_init_rel)(Rel_desc *, Word *, void *);
202 	void 		(* mr_mach_eflags)(Ehdr *, Ofl_desc *);
203 	void		(* mr_mach_make_dynamic)(Ofl_desc *, size_t *);
204 	void		(* mr_mach_update_odynamic)(Ofl_desc *, Dyn **);
205 	Xword		(* mr_calc_plt_addr)(Sym_desc *, Ofl_desc *);
206 	uintptr_t	(* mr_perform_outreloc)(Rel_desc *, Ofl_desc *,
207 			    Boolean *);
208 	uintptr_t	(* mr_do_activerelocs)(Ofl_desc *);
209 	uintptr_t	(* mr_add_outrel)(Word, Rel_desc *, Ofl_desc *);
210 	uintptr_t	(* mr_reloc_register)(Rel_desc *, Is_desc *,
211 			    Ofl_desc *);
212 	uintptr_t	(* mr_reloc_local)(Rel_desc *, Ofl_desc *);
213 	uintptr_t	(* mr_reloc_GOTOP)(Boolean, Rel_desc *, Ofl_desc *);
214 	uintptr_t	(* mr_reloc_TLS)(Boolean, Rel_desc *, Ofl_desc *);
215 	uintptr_t	(* mr_assign_got)(Ofl_desc *, Sym_desc *);
216 
217 	Gotndx		*(* mr_find_got_ndx)(Alist *, Gotref, Ofl_desc *,
218 			    Rel_desc *);
219 	Xword		(* mr_calc_got_offset)(Rel_desc *, Ofl_desc *);
220 	uintptr_t	(* mr_assign_got_ndx)(Alist **, Gotndx *, Gotref,
221 			    Ofl_desc *, Rel_desc *, Sym_desc *);
222 	void		(* mr_assign_plt_ndx)(Sym_desc *, Ofl_desc *);
223 	uintptr_t	(* mr_allocate_got)(Ofl_desc *);
224 	uintptr_t	(* mr_fillin_gotplt)(Ofl_desc *);
225 } Target_machrel;
226 
227 
228 /*
229  * Target_machsym holds pointers to the machsym functions
230  * for a given target machine.
231  *
232  * These fields are allowed to be NULL for targets that do not require
233  * special handling of register symbols. Register symbols are used by
234  * sparc targets. If any of these fields are non-NULL, all of them are
235  * required to be present (use empty stub routines if necessary).
236  */
237 typedef struct {
238 	int		(* ms_reg_check)(Sym_desc *, Sym *, const char *,
239 			    Ifl_desc *, Ofl_desc *);
240 	int		(* ms_mach_sym_typecheck)(Sym_desc *, Sym *,
241 			    Ifl_desc *, Ofl_desc *);
242 	const char	*(* ms_is_regsym)(Ofl_desc *, Ifl_desc *, Sym *,
243 			    const char *, int, Word, const char *, sd_flag_t *);
244 	Sym_desc	*(* ms_reg_find)(Sym * sym, Ofl_desc * ofl);
245 	int		(* ms_reg_enter)(Sym_desc *, Ofl_desc *);
246 } Target_machsym;
247 
248 typedef struct {
249 	Target_mach	t_m;
250 	Target_machid	t_id;
251 	Target_nullfunc	t_nf;
252 	Target_fillfunc	t_ff;
253 	Target_machrel	t_mr;
254 	Target_machsym	t_ms;
255 } Target;
256 
257 /*
258  * Structure to manage the update of weak symbols from their associated alias.
259  */
260 typedef	struct wk_desc {
261 	Sym		*wk_symtab;	/* the .symtab entry */
262 	Sym		*wk_dynsym;	/* the .dynsym entry */
263 	Sym_desc	*wk_weak;	/* the original weak symbol */
264 	Sym_desc	*wk_alias;	/* the real symbol */
265 } Wk_desc;
266 
267 /*
268  * Structure to manage the support library interfaces.
269  */
270 typedef struct func_list {
271 	const char	*fl_obj;	/* name of support object */
272 					/*	function is from */
273 	void		(*fl_fptr)();	/* function pointer */
274 	uint_t		fl_version;	/* ld_version() level */
275 } Func_list;
276 
277 typedef	struct support_list {
278 	const char	*sup_name;	/* ld_support function name */
279 	Alist		*sup_funcs;	/* list of support functions */
280 } Support_list;
281 
282 /*
283  * Structure to manage a sorted output relocation list.
284  *
285  *	rl_key1		->	pointer to needed ndx
286  *	rl_key2		->	pointer to symbol relocation is against
287  *	rl_key3		->	virtual offset of relocation
288  */
289 typedef struct reloc_list {
290 	Sym_desc	*rl_key2;
291 	Xword		rl_key3;
292 	Rel_desc	*rl_rsp;
293 	Half		rl_key1;
294 } Reloc_list;
295 
296 
297 typedef struct sym_s_list {
298 	Word		sl_hval;
299 	Sym_desc	*sl_sdp;
300 } Sym_s_list;
301 
302 /*
303  * ld heap management structure
304  */
305 typedef struct _ld_heap Ld_heap;
306 struct _ld_heap {
307 	Ld_heap		*lh_next;
308 	void		*lh_free;
309 	void		*lh_end;
310 };
311 
312 #define	HEAPBLOCK	0x800000	/* default allocation block size */
313 #define	HEAPALIGN	0x8		/* heap blocks alignment requirement */
314 
315 /*
316  * Dynamic per-symbol filtee string table descriptor.  This associates filtee
317  * strings that will be created in the .dynstr, with .dynamic entries.
318  */
319 typedef struct {
320 	const char	*dft_str;	/* dynstr string */
321 	Word		dft_flag;	/* auxiliary/filtee type */
322 	Half		dft_ndx;	/* eventual ndx into .dynamic */
323 } Dfltr_desc;
324 
325 /*
326  * Per-symbol filtee descriptor.  This associates symbol definitions with
327  * their filtees.
328  */
329 typedef struct {
330 	Sym_desc	*sft_sdp;	/* symbol descriptor */
331 	Aliste		sft_idx;	/* index into dtstr descriptor */
332 } Sfltr_desc;
333 
334 /*
335  * Capabilities descriptor, and capabilities group descriptor, used to track
336  * the symbol capabilities of any input files and the output file.
337  *
338  * A relocatable object input file may contain one or more symbol capabilities
339  * groups.  The Cap_desc structures keep track of all unique groups that are
340  * collected for the output file.  Relocatable objects that contain an object
341  * capabilities group, and the -z symbolcap option is in effect, have their
342  * object group translated to a symbol capabilities group.
343  *
344  * Individual capabilities groups are maintained with the Cap_group descriptor.
345  * A group can consist of one or more capabilities definitions.  One or more
346  * symbols can be associated with each group.
347  *
348  * For the output file, capabilities families are used to track the symbols of
349  * a given family, each symbol being associated with a different group.  This
350  * collection of data is used to create the final Capinfo structure, and for
351  * dynamic objects, the Capchain structure.
352  *
353  * For example, an object may contain two capabilities groups:
354  *
355  *	CA_SUNW_MACH - sun4u		CA_SUNW_MACH - sun4v
356  *
357  * Two symbols can be associated with each group:
358  *
359  *	foo%sun4u			foo%sun4v
360  *	bar%sun4u			bar%sun4v
361  *
362  * Two families are maintained, and include the generic, or lead, instance of
363  * the capabilities members:
364  *
365  *	foo,  foo%sun4u,  foo%sun4v
366  *	bar,  bar%sun4u,  bar%sun4v
367  */
368 struct cap_desc {
369 	APlist		*ca_groups;	/* capabilities groups (Cap_group) */
370 	APlist		*ca_syms;	/* copies of symbols that are being */
371 					/*	translated from object to */
372 };					/*	symbol capabilities */
373 
374 typedef struct {
375 	Objcapset	cg_set;		/* unpacked SHT_SUNW_cap elements */
376 	APlist		*cg_secs;	/* sections, and hence files, that */
377 					/*	use this descriptor */
378 	Word		cg_num;		/* number of comparable elements in */
379 					/*	the group */
380 	Word		cg_ndx;		/* final capability group index */
381 } Cap_group;
382 
383 /*
384  * A Capabilities family node, extends a symbol node, and provides for tracking
385  * capabilities families.  A family is defined by its lead symbol (for example,
386  * a generic, non-capabilities aware foo()), and one or more capabilities
387  * members (for example, capabilities instances foo%sun4u(), foo%sun4v(), etc.).
388  *
389  * Each member associates a symbol with its group using a Cap_sym structure.
390  */
391 typedef struct {
392 	Sym_avlnode	cn_symavlnode;
393 	APlist		*cn_members;
394 	APlist		*cn_aliases;
395 } Cap_avlnode;
396 
397 typedef struct {
398 	Sym_desc	*cs_sdp;	/* capabilities symbol descriptor */
399 	Cap_group	*cs_group;	/* associated capabilities group */
400 } Cap_sym;
401 
402 /*
403  * Define Alist initialization sizes.
404  */
405 #define	AL_CNT_IFL_GROUPS	20	/* ifl_groups */
406 #define	AL_CNT_IFL_RELSECS	6	/* ifl_relsect */
407 
408 #define	AL_CNT_CAP_DESCS	4	/* symbol capabilities descriptors */
409 #define	AL_CNT_CAP_SYMS		20	/* capabilities symbols */
410 #define	AL_CNT_CAP_SECS		10	/* capabilities sections */
411 #define	AL_CNT_CAP_NAMES	10	/* Objcapset platform and machine */
412 					/*	names */
413 #define	AL_CNT_CAP_MEMS		10	/* capability family members */
414 #define	AL_CNT_CAP_PAIRS	10	/* capability symbol pairs */
415 #define	AL_CNT_CAP_ALIASES	2	/* capability lead symbol aliases */
416 
417 #define	AL_CNT_OFL_DTSFLTRS	4	/* ofl_dtsfltrs */
418 #define	AL_CNT_OFL_SYMFLTRS	20	/* ofl_symfltrs */
419 #define	AL_CNT_OFL_MAPSECS	10	/* ofl_map{text|data} */
420 #define	AL_CNT_OFL_OBJS		50	/* ofl_objs */
421 #define	AL_CNT_OFL_LIBS		10	/* ofl_sos */
422 #define	AL_CNT_OFL_LIBDIRS	10	/* ofl_[ud]libdirs */
423 #define	AL_CNT_OFL_MAPFILES	6	/* ofl_maps */
424 #define	AL_CNT_OFL_ENTRANCE	10	/* ofl_ents */
425 #define	AL_CNT_OFL_RELS		4	/* ofl_outrels */
426 #define	AL_CNT_OFL_COPYRELS	10	/* ofl_copyrels */
427 #define	AL_CNT_OFL_ARRAYS	10	/* ofl_{init|fini|prei}array */
428 #define	AL_CNT_OFL_OSGROUPS	10	/* ofl_osgroups */
429 #define	AL_CNT_OFL_OSTLSSEG	4	/* ofl_ostlsseg */
430 #define	AL_CNT_OFL_ORDERED	4	/* ofl_ordered */
431 #define	AL_CNT_OFL_SYMINFOSYMS	50	/* ofl_syminfsyms */
432 #define	AL_CNT_OFL_MOVE		10	/* ofl_ismove */
433 #define	AL_CNT_OFL_UNWIND	1	/* ofl_unwind */
434 #define	AL_CNT_OFL_PARSYMS	10	/* ofl_parsyms */
435 
436 #define	AL_CNT_OS_MSTRISDESCS	10	/* os_mstrisdescs */
437 #define	AL_CNT_OS_RELISDESCS	100	/* os_relisdescs */
438 #define	AL_CNT_OS_COMDATS	20	/* os_comdats */
439 #define	AL_CNT_OS_ISDESCS_BA	4	/* os_isdesc: BEFORE|AFTER */
440 #define	AL_CNT_OS_ISDESCS	60	/* os_isdesc: ORDERED|DEFAULT */
441 
442 #define	AL_CNT_SG_IS_ORDER	40	/* sg_is_order */
443 #define	AL_CNT_SG_OSDESC	40	/* sg_osdescs */
444 #define	AL_CNT_SG_SECORDER	40	/* sg_secorder */
445 #define	AL_CNT_SG_SIZESYM	1	/* sg_sizesym */
446 
447 #define	AL_CNT_SDP_GOT		1	/* sd_GOTndxs */
448 #define	AL_CNT_SDP_MOVE		1	/* sd_move */
449 #define	AL_CNT_SDP_DFILES	1	/* sa_dfiles */
450 
451 #define	AL_CNT_SDF_VERSIONS	2	/* sdf_{vers|verneed} */
452 
453 #define	AL_CNT_EC_FILES		1	/* ec_files */
454 
455 #define	AL_CNT_VERDESCS		20	/* version desc */
456 #define	AL_CNT_WEAK		20	/* weak desc */
457 #define	AL_CNT_SUPPORT		2	/* support libraries */
458 #define	AL_CNT_STRMRGREL	500	/* ld_make_strmerge() reloc alist cnt */
459 #define	AL_CNT_STRMRGSYM	20	/* ld_make_strmerge() sym alist cnt */
460 #define	AL_CNT_SEGMENTS		20	/* ofl_segs */
461 
462 /*
463  * Return codes for {tls|got}_fixups() routines
464  */
465 typedef enum {
466 	FIX_ERROR,	/* fatal error - time to punt */
467 	FIX_DONE,	/* relocation done - no further processing required */
468 	FIX_RELOC	/* do_reloc() relocation processing required */
469 } Fixupret;
470 
471 #ifndef	FILENAME_MAX
472 #define	FILENAME_MAX	BUFSIZ		/* maximum length of a path name */
473 #endif
474 
475 /*
476  * We pad the end of the .dynstr section with a block of DYNSTR_EXTRA_PAD
477  * bytes, and we insert DYNAMIC_EXTRA_ELTS unused items into the
478  * .dynamic section (with value DT_NULL). This provides the resources needed
479  * to add and/or alter string items in the .dynamic section, such as runpath.
480  */
481 #define	DYNSTR_EXTRA_PAD	512
482 #define	DYNAMIC_EXTRA_ELTS	10
483 
484 /*
485  * Default relocation cache allocation unit. This number should be small
486  * enough to not hurt memory use significantly, but large enough to avoid
487  * the need for too many subsequent allocations.
488  */
489 #define	REL_CACHEBUF_ALLOC	3000
490 #define	RELAUX_CACHEBUF_ALLOC	1500
491 
492 /*
493  * Given a symbol of a type that is allowed within a .SUNW_dynsymsort or
494  * .SUNW_dyntlssort section, examine the symbol attributes to determine
495  * if this particular symbol should be included or not.
496  *
497  * entry:
498  *	The symbol must have an allowed type: Either a type verified by
499  *	dynsymsort_symtype[] or STT_TLS.
500  *
501  *	_sdp - Pointer to symbol descriptor
502  *	_sym - Pointer to symbol referenced by _sdp.
503  *
504  *	_sym is derivable from _sdp: _sdp->sd_sym
505  *	However, most callers assign it to a local variable for efficiency,
506  *	and this macro allows such a variable to be used within. If you
507  *	don't have such a variable, supply _sdp->sd_sym.
508  *
509  * The tests used require some explanation:
510  *
511  *	(_sdp->sd_flags & FLG_SY_DYNSORT)
512  *		Some special symbols are kept even if they don't meet the
513  *		usual requirements. These symbols have the FLG_SY_DYNSORT
514  *		bit set. If this bit isn't set then we look at the other
515  *		attributes.
516  *
517  *	(((_sdp->sd_ref != REF_DYN_NEED) &&
518  *		(_sdp->sd_sym->st_shndx != SHN_UNDEF))
519  *	|| (_sdp->sd_flags & FLG_SY_MVTOCOMM))
520  *		We do not want to include symbols that are not defined within
521  *		the object we are creating. REF_DYN_NEED corresponds to those
522  *		UNDEF items. However, if the symbol is the target of a copy
523  *		relocation, then it effectively becomes defined within the
524  *		object after all. FLG_SY_MVTOCOMM indicates a copy relocation,
525  *		and prevents us from culling those exceptions.
526  *
527  *	(_sym->st_size != 0)
528  *		Symbols with 0 length are labels injected by the compilers
529  *		or the linker for purposes of code generation, and do
530  *		not directly correspond to actual code. In fact, most of the
531  *		symbols we mark with FLG_SY_DYNSORT need that flag set because
532  *		they have size 0. This size test filters out the others.
533  *
534  *	!(_sdp->sd_flags & FLG_SY_NODYNSORT)
535  *		Some symbols are not kept, even though they do meet the usual
536  *		requirements. These symbols have FLG_SY_NODYNSORT set.
537  *		For example, if there are weak and non-weak versions of a given
538  *		symbol, we only want to keep one of them. So, we set
539  *		FLG_SY_NODYNSORT on the one we don't want.
540  */
541 #define	DYNSORT_TEST_ATTR(_sdp, _sym) \
542 	((_sdp->sd_flags & FLG_SY_DYNSORT) || \
543 	((((_sdp->sd_ref != REF_DYN_NEED) && \
544 		(_sdp->sd_sym->st_shndx != SHN_UNDEF)) || \
545 		(_sdp->sd_flags & FLG_SY_MVTOCOMM)) && \
546 	(_sym->st_size != 0) && \
547 	!(_sdp->sd_flags & FLG_SY_NODYNSORT)))
548 
549 /*
550  * We use output section descriptor counters to add up the number of
551  * symbol indexes to put in the .SUNW_dynsort and .SUNW_dyntlssort sections.
552  * Non-TLS symbols are counted by ofl->ofl_dynsymsortcnt, while TLS symbols are
553  * counted by ofl->ofl_dyntlssortcnt. This computation is done inline in
554  * several places. The DYNSORT_COUNT macro allows us to generate this from
555  * a single description.
556  *
557  * entry:
558  *	_sdp, _sym - As per DYNSORT_TEST_ATTR
559  *	_type - Type of symbol (STT_*)
560  *	_inc_or_dec_op - Either ++, or --. This specifies the operation
561  *		to be applied to the counter, and determines whether we
562  *		are adding, or removing, a symbol from .SUNW_dynsymsort.
563  *
564  * Note that _type is derivable from _sym: ELF_ST_TYPE(_sdp->sd_sym->st_info).
565  * Most callers already have it in a variable, so this allows us to use that
566  * variable. If you don't have such a variable, use ELF_ST_TYPE() as shown.
567  */
568 #define	DYNSORT_COUNT(_sdp, _sym, _type, _inc_or_dec_op) \
569 { \
570 	Word *_cnt_var; \
571 	\
572 	if (dynsymsort_symtype[_type]) {	/* Non-TLS counter */ \
573 		_cnt_var = &ofl->ofl_dynsymsortcnt; \
574 	} else if ((_type) == STT_TLS) {	/* TLS counter */ \
575 		_cnt_var = &ofl->ofl_dyntlssortcnt; \
576 	} else {				/* Don't count this symbol */ \
577 		_cnt_var = NULL; \
578 	} \
579 	if ((_cnt_var != NULL) && DYNSORT_TEST_ATTR(_sdp, _sym)) \
580 		(*_cnt_var)_inc_or_dec_op;	/* Increment/Decrement */ \
581 }
582 
583 /*
584  * The OFL_SWAP_RELOC macros are used to determine whether
585  * relocation processing needs to swap the data being relocated.
586  * It is an optimization to ld_swap_reloc_data(), as it avoids
587  * the function call in the case where the linker host and the
588  * target have the same byte order.
589  */
590 #define	OFL_SWAP_RELOC_DATA(_ofl, _rel) \
591 	(((_ofl)->ofl_flags1 & FLG_OF1_ENCDIFF) && \
592 	ld_swap_reloc_data(_ofl, _rel))
593 
594 /*
595  * Define an AVL node for maintaining input section descriptors. AVL trees of
596  * these descriptors are used to process group and COMDAT section.
597  *
598  * Pure COMDAT uses the input section name as the search key, while
599  * SHT_GROUP sections use the name of a special signature symbol. We
600  * support both by using the isd_name field to carry the name. An alternative
601  * design would be to use a separate type for each use, saving the cost
602  * of the unneeded pointer for pure COMDAT. We favor a single implementation
603  * because we believe that SHT_GROUP comdat will be more common going forward,
604  * particularly in the largest objects produced by C++ where SHT_GROUP is
605  * needed to manage the complex section relationships. In contrast, we think
606  * that pure COMDAT is both more rare, and used in smaller objects where the
607  * cost of an extra pointer per node is relatively unimportant.
608  */
609 typedef struct {
610 	avl_node_t	isd_avl;	/* avl book-keeping (see SGSOFFSETOF) */
611 	Is_desc		*isd_isp;	/* input section descriptor */
612 	const char	*isd_name;	/* name used as search key */
613 	uint_t		isd_hash;	/* input section name hash value */
614 } Isd_node;
615 
616 /*
617  * Type used to break down an input file path into its component parts,
618  * as used by ld_place_section() to compare an input file path to
619  * entrance criteria ec_files file strings.
620  *
621  * We define a path in the usual Unix '/' separated manner, augmented
622  * with an optional archive member suffix enclosed in parenthesis:
623  *
624  *	/dir/.../dir/basename(armember)
625  *
626  * The basename is the final path component, and includes the archive
627  * member, if present. The meaning of "object name" depends on whether or
628  * not the file comes from an archive or not. If not an archive, it is the
629  * same as the basename. If an archive, it is the name of the archive member
630  * from within the file.
631  *
632  * Variables of this type are initialized with ld_place_path_info_init().
633  */
634 typedef struct {
635 	const char	*ppi_path;	/* Full path */
636 	const char	*ppi_bname;	/* basename(ppi_path) */
637 	const char	*ppi_oname;	/* object name: Not NULL terminated */
638 	Boolean		ppi_isar;	/* TRUE if path has archive member */
639 	size_t		ppi_path_len;	/* strlen(ppi_path) */
640 	size_t		ppi_bname_len;	/* strlen(ppi_bname) */
641 	size_t		ppi_oname_len;	/* strlen(ppi_oname) */
642 } Place_path_info;
643 
644 /*
645  * Local data items.
646  */
647 extern char		*Plibpath;
648 extern char		*Llibdir;
649 extern char		*Ulibdir;
650 extern Ld_heap		*ld_heap;
651 extern APlist		*lib_support;
652 extern int		demangle_flag;
653 extern const Msg	reject[];
654 extern int		Verbose;
655 extern const int	ldynsym_symtype[];
656 extern const int	dynsymsort_symtype[];
657 
658 /*
659  * Local functions.
660  */
661 extern char		*add_string(char *, char *);
662 extern const char	*demangle(const char *);
663 extern int		cap_names_match(Alist *, Alist *);
664 
665 extern void		lds_atexit(Ofl_desc *, int);
666 
667 extern void		libld_free(void *);
668 extern void		*libld_malloc(size_t);
669 extern void		*libld_realloc(void *, size_t);
670 
671 extern int		isdavl_compare(const void *, const void *);
672 
673 extern Sdf_desc		*sdf_add(const char *, APlist **);
674 extern Sdf_desc		*sdf_find(const char *, APlist *);
675 
676 #if	defined(_ELF64)
677 
678 #define	ld_add_actrel		ld64_add_actrel
679 #define	ld_add_libdir		ld64_add_libdir
680 #define	ld_adj_movereloc	ld64_adj_movereloc
681 #define	ld_am_I_partial		ld64_am_I_partial
682 #define	ld_ar_member		ld64_ar_member
683 #define	ld_ar_setup		ld64_ar_setup
684 #define	ld_assign_got_TLS	ld64_assign_got_TLS
685 #define	ld_bswap_Word		ld64_bswap_Word
686 #define	ld_bswap_Xword		ld64_bswap_Xword
687 #define	ld_cap_add_family	ld64_cap_add_family
688 #define	ld_cap_move_symtoobj	ld64_cap_move_symtoobj
689 #define	ld_disp_errmsg		ld64_disp_errmsg
690 #define	ld_ent_check		ld64_ent_check
691 #define	ld_ent_lookup		ld64_ent_lookup
692 #define	ld_eprintf		ld64_eprintf
693 #define	ld_exit			ld64_exit
694 #define	ld_find_library		ld64_find_library
695 #define	ld_finish_libs		ld64_finish_libs
696 #define	ld_get_group		ld64_get_group
697 #define	ld_group_process	ld64_group_process
698 #define	ld_lib_setup		ld64_lib_setup
699 #define	ld_init_sighandler	ld64_init_sighandler
700 #define	ld_lcm			ld64_lcm
701 #define	ld_make_bss		ld64_make_bss
702 #define	ld_make_data		ld64_make_data
703 #define	ld_make_got		ld64_make_got
704 #define	ld_make_parexpn_data	ld64_make_parexpn_data
705 #define	ld_make_sunwmove	ld64_make_sunmove
706 #define	ld_make_text		ld64_make_text
707 #define	ld_map_out		ld64_map_out
708 #define	ld_map_parse		ld64_map_parse
709 #define	ld_map_post_process	ld64_map_post_process
710 #define	ld_open_outfile		ld64_open_outfile
711 #define	ld_os_first_isdesc	ld64_os_first_isdesc
712 #define	ld_place_path_info_init	ld64_place_path_info_init
713 #define	ld_place_section	ld64_place_section
714 #define	ld_process_archive	ld64_process_archive
715 #define	ld_process_files	ld64_process_files
716 #define	ld_process_flags	ld64_process_flags
717 #define	ld_process_ifl		ld64_process_ifl
718 #define	ld_process_move		ld64_process_move
719 #define	ld_process_open		ld64_process_open
720 #define	ld_process_ordered	ld64_process_ordered
721 #define	ld_process_sym_reloc	ld64_process_sym_reloc
722 #define	ld_reloc_enter		ld64_reloc_enter
723 #define	ld_reloc_GOT_relative	ld64_reloc_GOT_relative
724 #define	ld_reloc_plt		ld64_reloc_plt
725 #define	ld_reloc_remain_entry	ld64_reloc_remain_entry
726 #define	ld_reloc_set_aux_osdesc	ld64_reloc_set_aux_osdesc
727 #define	ld_reloc_set_aux_usym	ld64_reloc_set_aux_usym
728 #define	ld_reloc_sym_name	ld64_reloc_sym_name
729 #define	ld_reloc_targval_get	ld64_reloc_targval_get
730 #define	ld_reloc_targval_set	ld64_reloc_targval_set
731 #define	ld_sec_validate		ld64_sec_validate
732 #define	ld_seg_lookup		ld64_seg_lookup
733 #define	ld_sort_ordered		ld64_sort_ordered
734 #define	ld_stt_section_sym_name	ld64_stt_section_sym_name
735 #define	ld_sunw_ldmach		ld64_sunw_ldmach
736 #define	ld_sup_atexit		ld64_sup_atexit
737 #define	ld_sup_open		ld64_sup_open
738 #define	ld_sup_file		ld64_sup_file
739 #define	ld_sup_loadso		ld64_sup_loadso
740 #define	ld_sup_input_done	ld64_sup_input_done
741 #define	ld_sup_input_section	ld64_sup_input_section
742 #define	ld_sup_section		ld64_sup_section
743 #define	ld_sup_start		ld64_sup_start
744 #define	ld_swap_reloc_data	ld64_swap_reloc_data
745 #define	ld_sym_add_u		ld64_sym_add_u
746 #define	ld_sym_adjust_vis	ld64_sym_adjust_vis
747 #define	ld_sym_avl_comp		ld64_sym_avl_comp
748 #define	ld_sym_copy		ld64_sym_copy
749 #define	ld_sym_enter		ld64_sym_enter
750 #define	ld_sym_find		ld64_sym_find
751 #define	ld_sym_nodirect		ld64_sym_nodirect
752 #define	ld_sym_process		ld64_sym_process
753 #define	ld_sym_resolve		ld64_sym_resolve
754 #define	ld_sym_spec		ld64_sym_spec
755 #define	ld_targ			ld64_targ
756 #define	ld_targ_init_sparc	ld64_targ_init_sparc
757 #define	ld_targ_init_x86	ld64_targ_init_x86
758 #define	ld_unwind_make_hdr	ld64_unwind_make_hdr
759 #define	ld_unwind_populate_hdr	ld64_unwind_populate_hdr
760 #define	ld_unwind_register	ld64_unwind_register
761 #define	ld_vers_base		ld64_vers_base
762 #define	ld_vers_check_defs	ld64_vers_check_defs
763 #define	ld_vers_check_need	ld64_vers_check_need
764 #define	ld_vers_def_process	ld64_vers_def_process
765 #define	ld_vers_desc		ld64_vers_desc
766 #define	ld_vers_find		ld64_vers_find
767 #define	ld_vers_need_process	ld64_vers_need_process
768 #define	ld_vers_promote		ld64_vers_promote
769 #define	ld_vers_sym_process	ld64_vers_sym_process
770 #define	ld_vers_verify		ld64_vers_verify
771 #define	ld_wrap_enter		ld64_wrap_enter
772 
773 #else
774 
775 #define	ld_add_actrel		ld32_add_actrel
776 #define	ld_add_libdir		ld32_add_libdir
777 #define	ld_adj_movereloc	ld32_adj_movereloc
778 #define	ld_am_I_partial		ld32_am_I_partial
779 #define	ld_ar_member		ld32_ar_member
780 #define	ld_ar_setup		ld32_ar_setup
781 #define	ld_assign_got_TLS	ld32_assign_got_TLS
782 #define	ld_bswap_Word		ld32_bswap_Word
783 #define	ld_bswap_Xword		ld32_bswap_Xword
784 #define	ld_cap_add_family	ld32_cap_add_family
785 #define	ld_cap_move_symtoobj	ld32_cap_move_symtoobj
786 #define	ld_disp_errmsg		ld32_disp_errmsg
787 #define	ld_ent_check		ld32_ent_check
788 #define	ld_ent_lookup		ld32_ent_lookup
789 #define	ld_eprintf		ld32_eprintf
790 #define	ld_exit			ld32_exit
791 #define	ld_find_library		ld32_find_library
792 #define	ld_finish_libs		ld32_finish_libs
793 #define	ld_get_group		ld32_get_group
794 #define	ld_group_process	ld32_group_process
795 #define	ld_lib_setup		ld32_lib_setup
796 #define	ld_init_sighandler	ld32_init_sighandler
797 #define	ld_lcm			ld32_lcm
798 #define	ld_make_bss		ld32_make_bss
799 #define	ld_make_data		ld32_make_data
800 #define	ld_make_got		ld32_make_got
801 #define	ld_make_parexpn_data	ld32_make_parexpn_data
802 #define	ld_make_sunwmove	ld32_make_sunmove
803 #define	ld_make_text		ld32_make_text
804 #define	ld_map_out		ld32_map_out
805 #define	ld_map_parse		ld32_map_parse
806 #define	ld_map_post_process	ld32_map_post_process
807 #define	ld_open_outfile		ld32_open_outfile
808 #define	ld_os_first_isdesc	ld32_os_first_isdesc
809 #define	ld_place_path_info_init	ld32_place_path_info_init
810 #define	ld_place_section	ld32_place_section
811 #define	ld_process_archive	ld32_process_archive
812 #define	ld_process_files	ld32_process_files
813 #define	ld_process_flags	ld32_process_flags
814 #define	ld_process_ifl		ld32_process_ifl
815 #define	ld_process_move		ld32_process_move
816 #define	ld_process_open		ld32_process_open
817 #define	ld_process_ordered	ld32_process_ordered
818 #define	ld_process_sym_reloc	ld32_process_sym_reloc
819 #define	ld_reloc_enter		ld32_reloc_enter
820 #define	ld_reloc_GOT_relative	ld32_reloc_GOT_relative
821 #define	ld_reloc_plt		ld32_reloc_plt
822 #define	ld_reloc_remain_entry	ld32_reloc_remain_entry
823 #define	ld_reloc_set_aux_osdesc	ld32_reloc_set_aux_osdesc
824 #define	ld_reloc_set_aux_usym	ld32_reloc_set_aux_usym
825 #define	ld_reloc_sym_name	ld32_reloc_sym_name
826 #define	ld_reloc_targval_get	ld32_reloc_targval_get
827 #define	ld_reloc_targval_set	ld32_reloc_targval_set
828 #define	ld_sec_validate		ld32_sec_validate
829 #define	ld_seg_lookup		ld32_seg_lookup
830 #define	ld_sort_ordered		ld32_sort_ordered
831 #define	ld_stt_section_sym_name	ld32_stt_section_sym_name
832 #define	ld_sunw_ldmach		ld32_sunw_ldmach
833 #define	ld_sup_atexit		ld32_sup_atexit
834 #define	ld_sup_open		ld32_sup_open
835 #define	ld_sup_file		ld32_sup_file
836 #define	ld_sup_loadso		ld32_sup_loadso
837 #define	ld_sup_input_done	ld32_sup_input_done
838 #define	ld_sup_input_section	ld32_sup_input_section
839 #define	ld_sup_section		ld32_sup_section
840 #define	ld_sup_start		ld32_sup_start
841 #define	ld_swap_reloc_data	ld32_swap_reloc_data
842 #define	ld_sym_add_u		ld32_sym_add_u
843 #define	ld_sym_adjust_vis	ld32_sym_adjust_vis
844 #define	ld_sym_avl_comp		ld32_sym_avl_comp
845 #define	ld_sym_copy		ld32_sym_copy
846 #define	ld_sym_enter		ld32_sym_enter
847 #define	ld_sym_find		ld32_sym_find
848 #define	ld_sym_nodirect		ld32_sym_nodirect
849 #define	ld_sym_process		ld32_sym_process
850 #define	ld_sym_resolve		ld32_sym_resolve
851 #define	ld_sym_spec		ld32_sym_spec
852 #define	ld_targ			ld32_targ
853 #define	ld_targ_init_sparc	ld32_targ_init_sparc
854 #define	ld_targ_init_x86	ld32_targ_init_x86
855 #define	ld_unwind_make_hdr	ld32_unwind_make_hdr
856 #define	ld_unwind_populate_hdr	ld32_unwind_populate_hdr
857 #define	ld_unwind_register	ld32_unwind_register
858 #define	ld_vers_base		ld32_vers_base
859 #define	ld_vers_check_defs	ld32_vers_check_defs
860 #define	ld_vers_check_need	ld32_vers_check_need
861 #define	ld_vers_def_process	ld32_vers_def_process
862 #define	ld_vers_desc		ld32_vers_desc
863 #define	ld_vers_find		ld32_vers_find
864 #define	ld_vers_need_process	ld32_vers_need_process
865 #define	ld_vers_promote		ld32_vers_promote
866 #define	ld_vers_sym_process	ld32_vers_sym_process
867 #define	ld_vers_verify		ld32_vers_verify
868 #define	ld_wrap_enter		ld32_wrap_enter
869 
870 #endif
871 
872 extern void		dbg_cleanup(void);
873 extern int		dbg_setup(Ofl_desc *, const char *, int);
874 
875 extern uintptr_t	ld_add_actrel(Word, Rel_desc *, Ofl_desc *);
876 extern uintptr_t	ld_add_libdir(Ofl_desc *, const char *);
877 extern void 		ld_adj_movereloc(Ofl_desc *, Rel_desc *);
878 extern Sym_desc * 	ld_am_I_partial(Rel_desc *, Xword);
879 extern void		ld_ar_member(Ar_desc *, Elf_Arsym *, Ar_aux *,
880 			    Ar_mem *);
881 extern Ar_desc		*ld_ar_setup(const char *, Elf *, Ofl_desc *);
882 extern uintptr_t	ld_assign_got_TLS(Boolean, Rel_desc *, Ofl_desc *,
883 			    Sym_desc *, Gotndx *, Gotref, Word, Word,
884 			    Word, Word);
885 
886 extern Word		ld_bswap_Word(Word);
887 extern Xword		ld_bswap_Xword(Xword);
888 
889 extern uintptr_t	ld_cap_add_family(Ofl_desc *, Sym_desc *, Sym_desc *,
890 			    Cap_group *, APlist **);
891 extern void		ld_cap_move_symtoobj(Ofl_desc *);
892 
893 extern void		ld_disp_errmsg(const char *, Rel_desc *, Ofl_desc *);
894 
895 extern void		ld_ent_check(Ofl_desc *);
896 extern Ent_desc		*ld_ent_lookup(Ofl_desc *, const char *name,
897 			    avl_index_t *where);
898 extern void		ld_eprintf(Ofl_desc *, Error, const char *, ...);
899 extern int		ld_exit(Ofl_desc *);
900 
901 extern uintptr_t	ld_find_library(const char *, Ofl_desc *);
902 extern uintptr_t	ld_finish_libs(Ofl_desc *);
903 
904 extern const char	*ld_stt_section_sym_name(Is_desc *);
905 
906 extern Group_desc	*ld_get_group(Ofl_desc *, Is_desc *);
907 extern uintptr_t	ld_group_process(Is_desc *, Ofl_desc *);
908 
909 extern uintptr_t	ld_lib_setup(Ofl_desc *);
910 
911 extern void		ld_init_sighandler(Ofl_desc *);
912 
913 extern Xword		ld_lcm(Xword, Xword);
914 
915 extern uintptr_t	ld_make_bss(Ofl_desc *, Xword, Xword, uint_t);
916 extern Is_desc		*ld_make_data(Ofl_desc *, size_t);
917 extern uintptr_t	ld_make_got(Ofl_desc *);
918 extern uintptr_t	ld_make_parexpn_data(Ofl_desc *, size_t, Xword);
919 extern uintptr_t	ld_make_sunwmove(Ofl_desc *, int);
920 extern Is_desc		*ld_make_text(Ofl_desc *, size_t);
921 extern void		ld_map_out(Ofl_desc *);
922 extern Boolean		ld_map_parse(const char *, Ofl_desc *);
923 extern Boolean		ld_map_post_process(Ofl_desc *);
924 
925 extern uintptr_t	ld_open_outfile(Ofl_desc *);
926 
927 extern Is_desc		*ld_os_first_isdesc(Os_desc *);
928 extern Place_path_info	*ld_place_path_info_init(Ofl_desc *, Ifl_desc *,
929 			    Place_path_info *);
930 extern Os_desc		*ld_place_section(Ofl_desc *, Is_desc *,
931 			    Place_path_info *path_info,  int, const char *);
932 extern Boolean		ld_process_archive(const char *, int, Ar_desc *,
933 			    Ofl_desc *);
934 extern uintptr_t	ld_process_files(Ofl_desc *, int, char **);
935 extern uintptr_t	ld_process_flags(Ofl_desc *, int, char **);
936 extern uintptr_t	ld_process_ifl(const char *, const char *, int, Elf *,
937 			    Word, Ofl_desc *, Rej_desc *, Ifl_desc **);
938 extern uintptr_t	ld_process_move(Ofl_desc *);
939 extern uintptr_t	ld_process_open(const char *, const char *, int *,
940 			    Ofl_desc *, Word, Rej_desc *, Ifl_desc **);
941 extern uintptr_t	ld_process_ordered(Ofl_desc *, Ifl_desc *,
942 			    Place_path_info *path_info,  Word);
943 extern uintptr_t	ld_process_sym_reloc(Ofl_desc *, Rel_desc *, Rel *,
944 			    Is_desc *, const char *, Word);
945 
946 extern Rel_desc		*ld_reloc_enter(Ofl_desc *, Rel_cache *, Rel_desc *,
947 			    Word);
948 extern uintptr_t	ld_reloc_GOT_relative(Boolean, Rel_desc *, Ofl_desc *);
949 extern uintptr_t	ld_reloc_plt(Rel_desc *, Ofl_desc *);
950 extern void		ld_reloc_remain_entry(Rel_desc *, Os_desc *,
951 			    Ofl_desc *, Boolean *);
952 extern Boolean		ld_reloc_set_aux_osdesc(Ofl_desc *, Rel_desc *,
953 			    Os_desc *);
954 extern Boolean		ld_reloc_set_aux_usym(Ofl_desc *, Rel_desc *,
955 			    Sym_desc *);
956 
957 extern const char	*ld_reloc_sym_name(Rel_desc *);
958 extern int		ld_reloc_targval_get(Ofl_desc *, Rel_desc *,
959 			    uchar_t *, Xword *);
960 extern int		ld_reloc_targval_set(Ofl_desc *, Rel_desc *,
961 			    uchar_t *, Xword);
962 
963 extern Sg_desc		*ld_seg_lookup(Ofl_desc *, const char *,
964 			    avl_index_t *where);
965 extern void		ld_sec_validate(Ofl_desc *);
966 extern uintptr_t	ld_sort_ordered(Ofl_desc *);
967 extern Half		ld_sunw_ldmach();
968 extern void		ld_sup_atexit(Ofl_desc *, int);
969 extern void		ld_sup_open(Ofl_desc *, const char **, const char **,
970 			    int *, int, Elf **, Elf *ref, size_t,
971 			    const Elf_Kind);
972 extern void		ld_sup_file(Ofl_desc *, const char *, const Elf_Kind,
973 			    int flags, Elf *);
974 extern uintptr_t	ld_sup_loadso(Ofl_desc *, const char *);
975 extern void		ld_sup_input_done(Ofl_desc *);
976 extern void		ld_sup_section(Ofl_desc *, const char *, Shdr *, Word,
977 			    Elf_Data *, Elf *);
978 extern uintptr_t	ld_sup_input_section(Ofl_desc*, Ifl_desc *,
979 			    const char *, Shdr **, Word, Elf_Scn *, Elf *);
980 extern void		ld_sup_start(Ofl_desc *, const Half, const char *);
981 extern int		ld_swap_reloc_data(Ofl_desc *, Rel_desc *);
982 extern Sym_desc		*ld_sym_add_u(const char *, Ofl_desc *, Msg);
983 extern void		ld_sym_adjust_vis(Sym_desc *, Ofl_desc *);
984 extern int		ld_sym_avl_comp(const void *, const void *);
985 extern uintptr_t	ld_sym_copy(Sym_desc *);
986 extern Sym_desc		*ld_sym_enter(const char *, Sym *, Word, Ifl_desc *,
987 			    Ofl_desc *, Word, Word, sd_flag_t, avl_index_t *);
988 extern Sym_desc		*ld_sym_find(const char *, Word, avl_index_t *,
989 			    Ofl_desc *);
990 extern uintptr_t	ld_sym_nodirect(Is_desc *, Ifl_desc *, Ofl_desc *);
991 extern uintptr_t	ld_sym_process(Is_desc *, Ifl_desc *, Ofl_desc *);
992 extern uintptr_t	ld_sym_resolve(Sym_desc *, Sym *, Ifl_desc *,
993 			    Ofl_desc *, int, Word, sd_flag_t);
994 extern uintptr_t	ld_sym_spec(Ofl_desc *);
995 
996 extern Target		ld_targ;
997 extern const Target	*ld_targ_init_sparc(void);
998 extern const Target	*ld_targ_init_x86(void);
999 
1000 extern uintptr_t	ld_unwind_make_hdr(Ofl_desc *);
1001 extern uintptr_t	ld_unwind_populate_hdr(Ofl_desc *);
1002 extern uintptr_t	ld_unwind_register(Os_desc *, Ofl_desc *);
1003 
1004 extern Ver_desc		*ld_vers_base(Ofl_desc *);
1005 extern uintptr_t	ld_vers_check_defs(Ofl_desc *);
1006 extern uintptr_t	ld_vers_check_need(Ofl_desc *);
1007 extern uintptr_t	ld_vers_def_process(Is_desc *, Ifl_desc *, Ofl_desc *);
1008 extern Ver_desc		*ld_vers_desc(const char *, Word, APlist **);
1009 extern Ver_desc		*ld_vers_find(const char *, Word, APlist *);
1010 extern uintptr_t	ld_vers_need_process(Is_desc *, Ifl_desc *, Ofl_desc *);
1011 extern void		ld_vers_promote(Sym_desc *, Word, Ifl_desc *,
1012 			    Ofl_desc *);
1013 extern int		ld_vers_sym_process(Ofl_desc *, Is_desc *, Ifl_desc *);
1014 extern int		ld_vers_verify(Ofl_desc *);
1015 extern WrapSymNode	*ld_wrap_enter(Ofl_desc *, const char *);
1016 
1017 extern uintptr_t	add_regsym(Sym_desc *, Ofl_desc *);
1018 extern Word		hashbkts(Word);
1019 extern Xword		lcm(Xword, Xword);
1020 
1021 /*
1022  * Most platforms have both a 32 and 64-bit variant (e.g. EM_SPARC and
1023  * EM_SPARCV9). To support this, there many files in libld that are built
1024  * twice, once for ELFCLASS64 (_ELF64), and once for ELFCLASS32. In these
1025  * files, we sometimes want to supply one value for the ELFCLASS32 case
1026  * and another for ELFCLASS64. The LD_TARG_BYCLASS macro is used to do
1027  * this. It is called with both both alternatives, and yields the one
1028  * that applies to the current compilation environment.
1029  */
1030 #ifdef	_ELF64
1031 #define	LD_TARG_BYCLASS(_ec32, _ec64) (_ec64)
1032 #else
1033 #define	LD_TARG_BYCLASS(_ec32, _ec64) (_ec32)
1034 #endif
1035 
1036 
1037 #ifdef	__cplusplus
1038 }
1039 #endif
1040 
1041 #endif /* _LIBLD_DOT_H */
1042