xref: /titanic_41/usr/src/cmd/sgs/libld/common/machrel.amd.c (revision 49f9b365248ee858ee91baa36eab27c5200f6dca)
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) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
24  */
25 
26 /* Get the x86 version of the relocation engine */
27 #define	DO_RELOC_LIBLD_X86
28 
29 #include	<string.h>
30 #include	<stdio.h>
31 #include	<strings.h>
32 #include	<sys/elf_amd64.h>
33 #include	<debug.h>
34 #include	<reloc.h>
35 #include	<i386/machdep_x86.h>
36 #include	"msg.h"
37 #include	"_libld.h"
38 
39 /*
40  * This module uses do_reloc_ld() to execute several synthesized relocations.
41  * That function expects to be passed two things that we need to construct
42  * here:
43  *
44  * 1)	A Rel_desc descriptor for each relocation type, from which the
45  *	rel_rtype field, and nothing else, is obtained. This is easily
46  *	handled by constructing the necessary descriptors.
47  *
48  * 2)	A function, which called with the Rel_desc descriptor, returns
49  *	a string representing the name of the symbol associated with
50  *	the descriptor. The usual function for this is ld_reloc_sym_name().
51  *	However, that function will not work in this case, as these synthetic
52  *	relocations do not have an associated symbol. We supply the
53  *	syn_rdesc_sym_name() function to simply return the fixed name.
54  */
55 static Rel_desc rdesc_r_amd64_gotpcrel = {
56     NULL, NULL, NULL, 0, 0, 0, R_AMD64_GOTPCREL };
57 static Rel_desc rdesc_r_amd64_32 = {
58     NULL, NULL, NULL, 0, 0, 0, R_AMD64_32 };
59 static Rel_desc rdesc_r_amd64_pc32 = {
60     NULL, NULL, NULL, 0, 0, 0, R_AMD64_PC32 };
61 
62 /*ARGSUSED*/
63 static const char *
syn_rdesc_sym_name(Rel_desc * rdesc)64 syn_rdesc_sym_name(Rel_desc *rdesc)
65 {
66 	return (MSG_ORIG(MSG_SYM_PLTENT));
67 }
68 
69 /*
70  * Search the GOT index list for a GOT entry with a matching reference and the
71  * proper addend.
72  */
73 static Gotndx *
ld_find_got_ndx(Alist * alp,Gotref gref,Ofl_desc * ofl,Rel_desc * rdesc)74 ld_find_got_ndx(Alist *alp, Gotref gref, Ofl_desc *ofl, Rel_desc *rdesc)
75 {
76 	Aliste	idx;
77 	Gotndx	*gnp;
78 
79 	assert(rdesc != 0);
80 
81 	if ((gref == GOT_REF_TLSLD) && ofl->ofl_tlsldgotndx)
82 		return (ofl->ofl_tlsldgotndx);
83 
84 	for (ALIST_TRAVERSE(alp, idx, gnp)) {
85 		if ((rdesc->rel_raddend == gnp->gn_addend) &&
86 		    (gnp->gn_gotref == gref)) {
87 			return (gnp);
88 		}
89 	}
90 	return (NULL);
91 }
92 
93 static Xword
ld_calc_got_offset(Rel_desc * rdesc,Ofl_desc * ofl)94 ld_calc_got_offset(Rel_desc *rdesc, Ofl_desc *ofl)
95 {
96 	Os_desc		*osp = ofl->ofl_osgot;
97 	Sym_desc	*sdp = rdesc->rel_sym;
98 	Xword		gotndx;
99 	Gotref		gref;
100 	Gotndx		*gnp;
101 
102 	if (rdesc->rel_flags & FLG_REL_DTLS)
103 		gref = GOT_REF_TLSGD;
104 	else if (rdesc->rel_flags & FLG_REL_MTLS)
105 		gref = GOT_REF_TLSLD;
106 	else if (rdesc->rel_flags & FLG_REL_STLS)
107 		gref = GOT_REF_TLSIE;
108 	else
109 		gref = GOT_REF_GENERIC;
110 
111 	gnp = ld_find_got_ndx(sdp->sd_GOTndxs, gref, ofl, rdesc);
112 	assert(gnp);
113 
114 	gotndx = (Xword)gnp->gn_gotndx;
115 
116 	if ((rdesc->rel_flags & FLG_REL_DTLS) &&
117 	    (rdesc->rel_rtype == R_AMD64_DTPOFF64))
118 		gotndx++;
119 
120 	return ((Xword)(osp->os_shdr->sh_addr + (gotndx * M_GOT_ENTSIZE)));
121 }
122 
123 static Word
ld_init_rel(Rel_desc * reld,Word * typedata,void * reloc)124 ld_init_rel(Rel_desc *reld, Word *typedata, void *reloc)
125 {
126 	Rela	*rel = (Rela *)reloc;
127 
128 	/* LINTED */
129 	reld->rel_rtype = (Word)ELF_R_TYPE(rel->r_info, M_MACH);
130 	reld->rel_roffset = rel->r_offset;
131 	reld->rel_raddend = rel->r_addend;
132 	*typedata = 0;
133 
134 	reld->rel_flags |= FLG_REL_RELA;
135 
136 	return ((Word)ELF_R_SYM(rel->r_info));
137 }
138 
139 static void
ld_mach_eflags(Ehdr * ehdr,Ofl_desc * ofl)140 ld_mach_eflags(Ehdr *ehdr, Ofl_desc *ofl)
141 {
142 	ofl->ofl_dehdr->e_flags |= ehdr->e_flags;
143 }
144 
145 static void
ld_mach_make_dynamic(Ofl_desc * ofl,size_t * cnt)146 ld_mach_make_dynamic(Ofl_desc *ofl, size_t *cnt)
147 {
148 	if (!(ofl->ofl_flags & FLG_OF_RELOBJ)) {
149 		/*
150 		 * Create this entry if we are going to create a PLT table.
151 		 */
152 		if (ofl->ofl_pltcnt)
153 			(*cnt)++;		/* DT_PLTGOT */
154 	}
155 }
156 
157 static void
ld_mach_update_odynamic(Ofl_desc * ofl,Dyn ** dyn)158 ld_mach_update_odynamic(Ofl_desc *ofl, Dyn **dyn)
159 {
160 	if (((ofl->ofl_flags & FLG_OF_RELOBJ) == 0) && ofl->ofl_pltcnt) {
161 		(*dyn)->d_tag = DT_PLTGOT;
162 		if (ofl->ofl_osgot)
163 			(*dyn)->d_un.d_ptr = ofl->ofl_osgot->os_shdr->sh_addr;
164 		else
165 			(*dyn)->d_un.d_ptr = 0;
166 		(*dyn)++;
167 	}
168 }
169 
170 static Xword
ld_calc_plt_addr(Sym_desc * sdp,Ofl_desc * ofl)171 ld_calc_plt_addr(Sym_desc *sdp, Ofl_desc *ofl)
172 {
173 	Xword	value;
174 
175 	value = (Xword)(ofl->ofl_osplt->os_shdr->sh_addr) +
176 	    M_PLT_RESERVSZ + ((sdp->sd_aux->sa_PLTndx - 1) * M_PLT_ENTSIZE);
177 	return (value);
178 }
179 
180 /*
181  *  Build a single plt entry - code is:
182  *	JMP	*name1@GOTPCREL(%rip)
183  *	PUSHL	$index
184  *	JMP	.PLT0
185  */
186 static uchar_t pltn_entry[M_PLT_ENTSIZE] = {
187 /* 0x00 jmpq *name1@GOTPCREL(%rip) */	0xff, 0x25, 0x00, 0x00, 0x00, 0x00,
188 /* 0x06 pushq $index */			0x68, 0x00, 0x00, 0x00, 0x00,
189 /* 0x0b jmpq  .plt0(%rip) */		0xe9, 0x00, 0x00, 0x00, 0x00
190 /* 0x10 */
191 };
192 
193 static uintptr_t
plt_entry(Ofl_desc * ofl,Sym_desc * sdp)194 plt_entry(Ofl_desc * ofl, Sym_desc * sdp)
195 {
196 	uchar_t		*plt0, *pltent, *gotent;
197 	Sword		plt_off;
198 	Word		got_off;
199 	Xword		val1;
200 	int		bswap = (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) != 0;
201 
202 	got_off = sdp->sd_aux->sa_PLTGOTndx * M_GOT_ENTSIZE;
203 	plt_off = M_PLT_RESERVSZ + ((sdp->sd_aux->sa_PLTndx - 1) *
204 	    M_PLT_ENTSIZE);
205 	plt0 = (uchar_t *)(ofl->ofl_osplt->os_outdata->d_buf);
206 	pltent = plt0 + plt_off;
207 	gotent = (uchar_t *)(ofl->ofl_osgot->os_outdata->d_buf) + got_off;
208 
209 	bcopy(pltn_entry, pltent, sizeof (pltn_entry));
210 	/*
211 	 * Fill in the got entry with the address of the next instruction.
212 	 */
213 	/* LINTED */
214 	*(Word *)gotent = ofl->ofl_osplt->os_shdr->sh_addr + plt_off +
215 	    M_PLT_INSSIZE;
216 	if (bswap)
217 		/* LINTED */
218 		*(Word *)gotent = ld_bswap_Word(*(Word *)gotent);
219 
220 	/*
221 	 * If '-z noreloc' is specified - skip the do_reloc_ld
222 	 * stage.
223 	 */
224 	if (!OFL_DO_RELOC(ofl))
225 		return (1);
226 
227 	/*
228 	 * patchup:
229 	 *	jmpq	*name1@gotpcrel(%rip)
230 	 *
231 	 * NOTE: 0x06 represents next instruction.
232 	 */
233 	val1 = (ofl->ofl_osgot->os_shdr->sh_addr + got_off) -
234 	    (ofl->ofl_osplt->os_shdr->sh_addr + plt_off) - 0x06;
235 
236 	if (do_reloc_ld(&rdesc_r_amd64_gotpcrel, &pltent[0x02], &val1,
237 	    syn_rdesc_sym_name, MSG_ORIG(MSG_SPECFIL_PLTENT), bswap,
238 	    ofl->ofl_lml) == 0) {
239 		ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_PLT_PLTNFAIL),
240 		    sdp->sd_aux->sa_PLTndx, demangle(sdp->sd_name));
241 		return (S_ERROR);
242 	}
243 
244 	/*
245 	 * patchup:
246 	 *	pushq	$pltndx
247 	 */
248 	val1 = (Xword)(sdp->sd_aux->sa_PLTndx - 1);
249 
250 	if (do_reloc_ld(&rdesc_r_amd64_32, &pltent[0x07], &val1,
251 	    syn_rdesc_sym_name, MSG_ORIG(MSG_SPECFIL_PLTENT), bswap,
252 	    ofl->ofl_lml) == 0) {
253 		ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_PLT_PLTNFAIL),
254 		    sdp->sd_aux->sa_PLTndx, demangle(sdp->sd_name));
255 		return (S_ERROR);
256 	}
257 
258 	/*
259 	 * patchup:
260 	 *	jmpq	.plt0(%rip)
261 	 * NOTE: 0x10 represents next instruction. The rather complex
262 	 * series of casts is necessary to sign extend an offset into
263 	 * a 64-bit value while satisfying various compiler error
264 	 * checks.  Handle with care.
265 	 */
266 	val1 = (Xword)((intptr_t)((uintptr_t)plt0 -
267 	    (uintptr_t)(&pltent[0x10])));
268 
269 	if (do_reloc_ld(&rdesc_r_amd64_pc32, &pltent[0x0c], &val1,
270 	    syn_rdesc_sym_name, MSG_ORIG(MSG_SPECFIL_PLTENT), bswap,
271 	    ofl->ofl_lml) == 0) {
272 		ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_PLT_PLTNFAIL),
273 		    sdp->sd_aux->sa_PLTndx, demangle(sdp->sd_name));
274 		return (S_ERROR);
275 	}
276 
277 	return (1);
278 }
279 
280 static uintptr_t
ld_perform_outreloc(Rel_desc * orsp,Ofl_desc * ofl,Boolean * remain_seen)281 ld_perform_outreloc(Rel_desc * orsp, Ofl_desc * ofl, Boolean *remain_seen)
282 {
283 	Os_desc *	relosp, * osp = 0;
284 	Word		ndx;
285 	Xword		roffset, value;
286 	Sxword		raddend;
287 	Rela		rea;
288 	char		*relbits;
289 	Sym_desc *	sdp, * psym = (Sym_desc *)0;
290 	int		sectmoved = 0;
291 
292 	raddend = orsp->rel_raddend;
293 	sdp = orsp->rel_sym;
294 
295 	/*
296 	 * If the section this relocation is against has been discarded
297 	 * (-zignore), then also discard (skip) the relocation itself.
298 	 */
299 	if (orsp->rel_isdesc && ((orsp->rel_flags &
300 	    (FLG_REL_GOT | FLG_REL_BSS | FLG_REL_PLT | FLG_REL_NOINFO)) == 0) &&
301 	    (orsp->rel_isdesc->is_flags & FLG_IS_DISCARD)) {
302 		DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, M_MACH, orsp));
303 		return (1);
304 	}
305 
306 	/*
307 	 * If this is a relocation against a move table, or expanded move
308 	 * table, adjust the relocation entries.
309 	 */
310 	if (RELAUX_GET_MOVE(orsp))
311 		ld_adj_movereloc(ofl, orsp);
312 
313 	/*
314 	 * If this is a relocation against a section then we need to adjust the
315 	 * raddend field to compensate for the new position of the input section
316 	 * within the new output section.
317 	 */
318 	if (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION) {
319 		if (ofl->ofl_parsyms &&
320 		    (sdp->sd_isc->is_flags & FLG_IS_RELUPD) &&
321 		    /* LINTED */
322 		    (psym = ld_am_I_partial(orsp, orsp->rel_raddend))) {
323 			DBG_CALL(Dbg_move_outsctadj(ofl->ofl_lml, psym));
324 			sectmoved = 1;
325 			if (ofl->ofl_flags & FLG_OF_RELOBJ)
326 				raddend = psym->sd_sym->st_value;
327 			else
328 				raddend = psym->sd_sym->st_value -
329 				    psym->sd_isc->is_osdesc->os_shdr->sh_addr;
330 			/* LINTED */
331 			raddend += (Off)_elf_getxoff(psym->sd_isc->is_indata);
332 			if (psym->sd_isc->is_shdr->sh_flags & SHF_ALLOC)
333 				raddend +=
334 				    psym->sd_isc->is_osdesc->os_shdr->sh_addr;
335 		} else {
336 			/* LINTED */
337 			raddend += (Off)_elf_getxoff(sdp->sd_isc->is_indata);
338 			if (sdp->sd_isc->is_shdr->sh_flags & SHF_ALLOC)
339 				raddend +=
340 				    sdp->sd_isc->is_osdesc->os_shdr->sh_addr;
341 		}
342 	}
343 
344 	value = sdp->sd_sym->st_value;
345 
346 	if (orsp->rel_flags & FLG_REL_GOT) {
347 		/*
348 		 * Note: for GOT relative relocations on amd64
349 		 *	 we discard the addend.  It was relevant
350 		 *	 to the reference - not to the data item
351 		 *	 being referenced (ie: that -4 thing).
352 		 */
353 		raddend = 0;
354 		osp = ofl->ofl_osgot;
355 		roffset = ld_calc_got_offset(orsp, ofl);
356 
357 	} else if (orsp->rel_flags & FLG_REL_PLT) {
358 		/*
359 		 * Note that relocations for PLT's actually
360 		 * cause a relocation againt the GOT.
361 		 */
362 		osp = ofl->ofl_osplt;
363 		roffset = (ofl->ofl_osgot->os_shdr->sh_addr) +
364 		    sdp->sd_aux->sa_PLTGOTndx * M_GOT_ENTSIZE;
365 		raddend = 0;
366 		if (plt_entry(ofl, sdp) == S_ERROR)
367 			return (S_ERROR);
368 
369 	} else if (orsp->rel_flags & FLG_REL_BSS) {
370 		/*
371 		 * This must be a R_AMD64_COPY.  For these set the roffset to
372 		 * point to the new symbols location.
373 		 */
374 		osp = ofl->ofl_isbss->is_osdesc;
375 		roffset = value;
376 
377 		/*
378 		 * The raddend doesn't mean anything in a R_SPARC_COPY
379 		 * relocation.  Null it out because it can confuse people.
380 		 */
381 		raddend = 0;
382 	} else {
383 		osp = RELAUX_GET_OSDESC(orsp);
384 
385 		/*
386 		 * Calculate virtual offset of reference point; equals offset
387 		 * into section + vaddr of section for loadable sections, or
388 		 * offset plus section displacement for nonloadable sections.
389 		 */
390 		roffset = orsp->rel_roffset +
391 		    (Off)_elf_getxoff(orsp->rel_isdesc->is_indata);
392 		if (!(ofl->ofl_flags & FLG_OF_RELOBJ))
393 			roffset += orsp->rel_isdesc->is_osdesc->
394 			    os_shdr->sh_addr;
395 	}
396 
397 	if ((osp == 0) || ((relosp = osp->os_relosdesc) == 0))
398 		relosp = ofl->ofl_osrel;
399 
400 	/*
401 	 * Assign the symbols index for the output relocation.  If the
402 	 * relocation refers to a SECTION symbol then it's index is based upon
403 	 * the output sections symbols index.  Otherwise the index can be
404 	 * derived from the symbols index itself.
405 	 */
406 	if (orsp->rel_rtype == R_AMD64_RELATIVE)
407 		ndx = STN_UNDEF;
408 	else if ((orsp->rel_flags & FLG_REL_SCNNDX) ||
409 	    (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION)) {
410 		if (sectmoved == 0) {
411 			/*
412 			 * Check for a null input section. This can
413 			 * occur if this relocation references a symbol
414 			 * generated by sym_add_sym().
415 			 */
416 			if (sdp->sd_isc && sdp->sd_isc->is_osdesc)
417 				ndx = sdp->sd_isc->is_osdesc->os_identndx;
418 			else
419 				ndx = sdp->sd_shndx;
420 		} else
421 			ndx = ofl->ofl_parexpnndx;
422 	} else
423 		ndx = sdp->sd_symndx;
424 
425 	/*
426 	 * Add the symbols 'value' to the addend field.
427 	 */
428 	if (orsp->rel_flags & FLG_REL_ADVAL)
429 		raddend += value;
430 
431 	/*
432 	 * The addend field for R_AMD64_DTPMOD64 means nothing.  The addend
433 	 * is propagated in the corresponding R_AMD64_DTPOFF64 relocation.
434 	 */
435 	if (orsp->rel_rtype == R_AMD64_DTPMOD64)
436 		raddend = 0;
437 
438 	relbits = (char *)relosp->os_outdata->d_buf;
439 
440 	rea.r_info = ELF_R_INFO(ndx, orsp->rel_rtype);
441 	rea.r_offset = roffset;
442 	rea.r_addend = raddend;
443 	DBG_CALL(Dbg_reloc_out(ofl, ELF_DBG_LD, SHT_RELA, &rea, relosp->os_name,
444 	    ld_reloc_sym_name(orsp)));
445 
446 	/*
447 	 * Assert we haven't walked off the end of our relocation table.
448 	 */
449 	assert(relosp->os_szoutrels <= relosp->os_shdr->sh_size);
450 
451 	(void) memcpy((relbits + relosp->os_szoutrels),
452 	    (char *)&rea, sizeof (Rela));
453 	relosp->os_szoutrels += (Xword)sizeof (Rela);
454 
455 	/*
456 	 * Determine if this relocation is against a non-writable, allocatable
457 	 * section.  If so we may need to provide a text relocation diagnostic.
458 	 * Note that relocations against the .plt (R_AMD64_JUMP_SLOT) actually
459 	 * result in modifications to the .got.
460 	 */
461 	if (orsp->rel_rtype == R_AMD64_JUMP_SLOT)
462 		osp = ofl->ofl_osgot;
463 
464 	ld_reloc_remain_entry(orsp, osp, ofl, remain_seen);
465 	return (1);
466 }
467 
468 /*
469  * amd64 Instructions for TLS processing
470  */
471 static uchar_t tlsinstr_gd_ie[] = {
472 	/*
473 	 *	0x00 movq %fs:0, %rax
474 	 */
475 	0x64, 0x48, 0x8b, 0x04, 0x25,
476 	0x00, 0x00, 0x00, 0x00,
477 	/*
478 	 *	0x09 addq x@gottpoff(%rip), %rax
479 	 */
480 	0x48, 0x03, 0x05, 0x00, 0x00,
481 	0x00, 0x00
482 };
483 
484 static uchar_t tlsinstr_gd_le[] = {
485 	/*
486 	 *	0x00 movq %fs:0, %rax
487 	 */
488 	0x64, 0x48, 0x8b, 0x04, 0x25,
489 	0x00, 0x00, 0x00, 0x00,
490 	/*
491 	 *	0x09 leaq x@gottpoff(%rip), %rax
492 	 */
493 	0x48, 0x8d, 0x80, 0x00, 0x00,
494 	0x00, 0x00
495 };
496 
497 static uchar_t tlsinstr_ld_le[] = {
498 	/*
499 	 * .byte 0x66
500 	 */
501 	0x66,
502 	/*
503 	 * .byte 0x66
504 	 */
505 	0x66,
506 	/*
507 	 * .byte 0x66
508 	 */
509 	0x66,
510 	/*
511 	 * movq %fs:0, %rax
512 	 */
513 	0x64, 0x48, 0x8b, 0x04, 0x25,
514 	0x00, 0x00, 0x00, 0x00
515 };
516 
517 #define	REX_B		0x1
518 #define	REX_X		0x2
519 #define	REX_R		0x4
520 #define	REX_W		0x8
521 #define	REX_PREFIX	0x40
522 
523 #define	REX_RW		(REX_PREFIX | REX_R | REX_W)
524 #define	REX_BW		(REX_PREFIX | REX_B | REX_W)
525 #define	REX_BRW		(REX_PREFIX | REX_B | REX_R | REX_W)
526 
527 #define	REG_ESP		0x4
528 
529 #define	INSN_ADDMR	0x03	/* addq mem,reg */
530 #define	INSN_ADDIR	0x81	/* addq imm,reg */
531 #define	INSN_MOVMR	0x8b	/* movq mem,reg */
532 #define	INSN_MOVIR	0xc7	/* movq imm,reg */
533 #define	INSN_LEA	0x8d	/* leaq mem,reg */
534 
535 static Fixupret
tls_fixups(Ofl_desc * ofl,Rel_desc * arsp)536 tls_fixups(Ofl_desc *ofl, Rel_desc *arsp)
537 {
538 	Sym_desc	*sdp = arsp->rel_sym;
539 	Word		rtype = arsp->rel_rtype;
540 	uchar_t		*offset;
541 
542 	offset = (uchar_t *)((uintptr_t)arsp->rel_roffset +
543 	    (uintptr_t)_elf_getxoff(arsp->rel_isdesc->is_indata) +
544 	    (uintptr_t)RELAUX_GET_OSDESC(arsp)->os_outdata->d_buf);
545 
546 	/*
547 	 * Note that in certain of the original insn sequences below, the
548 	 * instructions are not necessarily adjacent
549 	 */
550 	if (sdp->sd_ref == REF_DYN_NEED) {
551 		/*
552 		 * IE reference model
553 		 */
554 		switch (rtype) {
555 		case R_AMD64_TLSGD:
556 			/*
557 			 *  GD -> IE
558 			 *
559 			 * Transition:
560 			 *	0x00 .byte 0x66
561 			 *	0x01 leaq x@tlsgd(%rip), %rdi
562 			 *	0x08 .word 0x6666
563 			 *	0x0a rex64
564 			 *	0x0b call __tls_get_addr@plt
565 			 *	0x10
566 			 * To:
567 			 *	0x00 movq %fs:0, %rax
568 			 *	0x09 addq x@gottpoff(%rip), %rax
569 			 *	0x10
570 			 */
571 			DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
572 			    R_AMD64_GOTTPOFF, arsp, ld_reloc_sym_name));
573 			arsp->rel_rtype = R_AMD64_GOTTPOFF;
574 			arsp->rel_roffset += 8;
575 			arsp->rel_raddend = (Sxword)-4;
576 
577 			/*
578 			 * Adjust 'offset' to beginning of instruction
579 			 * sequence.
580 			 */
581 			offset -= 4;
582 			(void) memcpy(offset, tlsinstr_gd_ie,
583 			    sizeof (tlsinstr_gd_ie));
584 			return (FIX_RELOC);
585 
586 		case R_AMD64_PLT32:
587 			/*
588 			 * Fixup done via the TLS_GD relocation.
589 			 */
590 			DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
591 			    R_AMD64_NONE, arsp, ld_reloc_sym_name));
592 			return (FIX_DONE);
593 		}
594 	}
595 
596 	/*
597 	 * LE reference model
598 	 */
599 	switch (rtype) {
600 	case R_AMD64_TLSGD:
601 		/*
602 		 * GD -> LE
603 		 *
604 		 * Transition:
605 		 *	0x00 .byte 0x66
606 		 *	0x01 leaq x@tlsgd(%rip), %rdi
607 		 *	0x08 .word 0x6666
608 		 *	0x0a rex64
609 		 *	0x0b call __tls_get_addr@plt
610 		 *	0x10
611 		 * To:
612 		 *	0x00 movq %fs:0, %rax
613 		 *	0x09 leaq x@tpoff(%rax), %rax
614 		 *	0x10
615 		 */
616 		DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
617 		    R_AMD64_TPOFF32, arsp, ld_reloc_sym_name));
618 		arsp->rel_rtype = R_AMD64_TPOFF32;
619 		arsp->rel_roffset += 8;
620 		arsp->rel_raddend = 0;
621 
622 		/*
623 		 * Adjust 'offset' to beginning of instruction sequence.
624 		 */
625 		offset -= 4;
626 		(void) memcpy(offset, tlsinstr_gd_le, sizeof (tlsinstr_gd_le));
627 		return (FIX_RELOC);
628 
629 	case R_AMD64_GOTTPOFF: {
630 		/*
631 		 * IE -> LE
632 		 *
633 		 * Transition 1:
634 		 *	movq %fs:0, %reg
635 		 *	addq x@gottpoff(%rip), %reg
636 		 * To:
637 		 *	movq %fs:0, %reg
638 		 *	leaq x@tpoff(%reg), %reg
639 		 *
640 		 * Transition (as a special case):
641 		 *	movq %fs:0, %r12/%rsp
642 		 *	addq x@gottpoff(%rip), %r12/%rsp
643 		 * To:
644 		 *	movq %fs:0, %r12/%rsp
645 		 *	addq x@tpoff(%rax), %r12/%rsp
646 		 *
647 		 * Transition 2:
648 		 *	movq x@gottpoff(%rip), %reg
649 		 *	movq %fs:(%reg), %reg
650 		 * To:
651 		 *	movq x@tpoff(%reg), %reg
652 		 *	movq %fs:(%reg), %reg
653 		 */
654 		Conv_inv_buf_t	inv_buf;
655 		uint8_t reg;		/* Register */
656 
657 		offset -= 3;
658 
659 		reg = offset[2] >> 3; /* Encoded dest. reg. operand */
660 
661 		DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
662 		    R_AMD64_TPOFF32, arsp, ld_reloc_sym_name));
663 		arsp->rel_rtype = R_AMD64_TPOFF32;
664 		arsp->rel_raddend = 0;
665 
666 		/*
667 		 * This is transition 2, and the special case of form 1 where
668 		 * a normal transition would index %rsp or %r12 and need a SIB
669 		 * byte in the leaq for which we lack space
670 		 */
671 		if ((offset[1] == INSN_MOVMR) ||
672 		    ((offset[1] == INSN_ADDMR) && (reg == REG_ESP))) {
673 			/*
674 			 * If we needed an extra bit of MOD.reg to refer to
675 			 * this register as the dest of the original movq we
676 			 * need an extra bit of MOD.rm to refer to it in the
677 			 * dest of the replacement movq or addq.
678 			 */
679 			if (offset[0] == REX_RW)
680 				offset[0] = REX_BW;
681 
682 			offset[1] = (offset[1] == INSN_MOVMR) ?
683 			    INSN_MOVIR : INSN_ADDIR;
684 			offset[2] = 0xc0 | reg;
685 
686 			return (FIX_RELOC);
687 		} else if (offset[1] == INSN_ADDMR) {
688 			/*
689 			 * If we needed an extra bit of MOD.reg to refer to
690 			 * this register in the dest of the addq we need an
691 			 * extra bit of both MOD.reg and MOD.rm to refer to it
692 			 * in the source and dest of the leaq
693 			 */
694 			if (offset[0] == REX_RW)
695 				offset[0] = REX_BRW;
696 
697 			offset[1] = INSN_LEA;
698 			offset[2] = 0x80 | (reg << 3) | reg;
699 
700 			return (FIX_RELOC);
701 		}
702 
703 		ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_REL_BADTLSINS),
704 		    conv_reloc_amd64_type(arsp->rel_rtype, 0, &inv_buf),
705 		    arsp->rel_isdesc->is_file->ifl_name,
706 		    ld_reloc_sym_name(arsp),
707 		    arsp->rel_isdesc->is_name,
708 		    EC_OFF(arsp->rel_roffset));
709 		return (FIX_ERROR);
710 	}
711 	case R_AMD64_TLSLD:
712 		/*
713 		 * LD -> LE
714 		 *
715 		 * Transition
716 		 *	0x00 leaq x1@tlsgd(%rip), %rdi
717 		 *	0x07 call __tls_get_addr@plt
718 		 *	0x0c
719 		 * To:
720 		 *	0x00 .byte 0x66
721 		 *	0x01 .byte 0x66
722 		 *	0x02 .byte 0x66
723 		 *	0x03 movq %fs:0, %rax
724 		 */
725 		DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
726 		    R_AMD64_NONE, arsp, ld_reloc_sym_name));
727 		offset -= 3;
728 		(void) memcpy(offset, tlsinstr_ld_le, sizeof (tlsinstr_ld_le));
729 		return (FIX_DONE);
730 
731 	case R_AMD64_DTPOFF32:
732 		/*
733 		 * LD->LE
734 		 *
735 		 * Transition:
736 		 *	0x00 leaq x1@dtpoff(%rax), %rcx
737 		 * To:
738 		 *	0x00 leaq x1@tpoff(%rax), %rcx
739 		 */
740 		DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
741 		    R_AMD64_TPOFF32, arsp, ld_reloc_sym_name));
742 		arsp->rel_rtype = R_AMD64_TPOFF32;
743 		arsp->rel_raddend = 0;
744 		return (FIX_RELOC);
745 	}
746 
747 	return (FIX_RELOC);
748 }
749 
750 static uintptr_t
ld_do_activerelocs(Ofl_desc * ofl)751 ld_do_activerelocs(Ofl_desc *ofl)
752 {
753 	Rel_desc	*arsp;
754 	Rel_cachebuf	*rcbp;
755 	Aliste		idx;
756 	uintptr_t	return_code = 1;
757 	ofl_flag_t	flags = ofl->ofl_flags;
758 
759 	if (aplist_nitems(ofl->ofl_actrels.rc_list) != 0)
760 		DBG_CALL(Dbg_reloc_doact_title(ofl->ofl_lml));
761 
762 	/*
763 	 * Process active relocations.
764 	 */
765 	REL_CACHE_TRAVERSE(&ofl->ofl_actrels, idx, rcbp, arsp) {
766 		uchar_t		*addr;
767 		Xword 		value;
768 		Sym_desc	*sdp;
769 		const char	*ifl_name;
770 		Xword		refaddr;
771 		int		moved = 0;
772 		Gotref		gref;
773 		Os_desc		*osp;
774 
775 		/*
776 		 * If the section this relocation is against has been discarded
777 		 * (-zignore), then discard (skip) the relocation itself.
778 		 */
779 		if ((arsp->rel_isdesc->is_flags & FLG_IS_DISCARD) &&
780 		    ((arsp->rel_flags & (FLG_REL_GOT | FLG_REL_BSS |
781 		    FLG_REL_PLT | FLG_REL_NOINFO)) == 0)) {
782 			DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, M_MACH, arsp));
783 			continue;
784 		}
785 
786 		/*
787 		 * We determine what the 'got reference' model (if required)
788 		 * is at this point.  This needs to be done before tls_fixup()
789 		 * since it may 'transition' our instructions.
790 		 *
791 		 * The got table entries have already been assigned,
792 		 * and we bind to those initial entries.
793 		 */
794 		if (arsp->rel_flags & FLG_REL_DTLS)
795 			gref = GOT_REF_TLSGD;
796 		else if (arsp->rel_flags & FLG_REL_MTLS)
797 			gref = GOT_REF_TLSLD;
798 		else if (arsp->rel_flags & FLG_REL_STLS)
799 			gref = GOT_REF_TLSIE;
800 		else
801 			gref = GOT_REF_GENERIC;
802 
803 		/*
804 		 * Perform any required TLS fixups.
805 		 */
806 		if (arsp->rel_flags & FLG_REL_TLSFIX) {
807 			Fixupret	ret;
808 
809 			if ((ret = tls_fixups(ofl, arsp)) == FIX_ERROR)
810 				return (S_ERROR);
811 			if (ret == FIX_DONE)
812 				continue;
813 		}
814 
815 		/*
816 		 * If this is a relocation against a move table, or
817 		 * expanded move table, adjust the relocation entries.
818 		 */
819 		if (RELAUX_GET_MOVE(arsp))
820 			ld_adj_movereloc(ofl, arsp);
821 
822 		sdp = arsp->rel_sym;
823 		refaddr = arsp->rel_roffset +
824 		    (Off)_elf_getxoff(arsp->rel_isdesc->is_indata);
825 
826 		if ((arsp->rel_flags & FLG_REL_CLVAL) ||
827 		    (arsp->rel_flags & FLG_REL_GOTCL))
828 			value = 0;
829 		else if (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION) {
830 			Sym_desc	*sym;
831 
832 			/*
833 			 * The value for a symbol pointing to a SECTION
834 			 * is based off of that sections position.
835 			 */
836 			if ((sdp->sd_isc->is_flags & FLG_IS_RELUPD) &&
837 			    /* LINTED */
838 			    (sym = ld_am_I_partial(arsp, arsp->rel_raddend))) {
839 				/*
840 				 * The symbol was moved, so adjust the value
841 				 * relative to the new section.
842 				 */
843 				value = sym->sd_sym->st_value;
844 				moved = 1;
845 
846 				/*
847 				 * The original raddend covers the displacement
848 				 * from the section start to the desired
849 				 * address. The value computed above gets us
850 				 * from the section start to the start of the
851 				 * symbol range. Adjust the old raddend to
852 				 * remove the offset from section start to
853 				 * symbol start, leaving the displacement
854 				 * within the range of the symbol.
855 				 */
856 				arsp->rel_raddend -= sym->sd_osym->st_value;
857 			} else {
858 				value = _elf_getxoff(sdp->sd_isc->is_indata);
859 				if (sdp->sd_isc->is_shdr->sh_flags & SHF_ALLOC)
860 					value += sdp->sd_isc->is_osdesc->
861 					    os_shdr->sh_addr;
862 			}
863 			if (sdp->sd_isc->is_shdr->sh_flags & SHF_TLS)
864 				value -= ofl->ofl_tlsphdr->p_vaddr;
865 
866 		} else if (IS_SIZE(arsp->rel_rtype)) {
867 			/*
868 			 * Size relocations require the symbols size.
869 			 */
870 			value = sdp->sd_sym->st_size;
871 
872 		} else if ((sdp->sd_flags & FLG_SY_CAP) &&
873 		    sdp->sd_aux && sdp->sd_aux->sa_PLTndx) {
874 			/*
875 			 * If relocation is against a capabilities symbol, we
876 			 * need to jump to an associated PLT, so that at runtime
877 			 * ld.so.1 is involved to determine the best binding
878 			 * choice. Otherwise, the value is the symbols value.
879 			 */
880 			value = ld_calc_plt_addr(sdp, ofl);
881 		} else
882 			value = sdp->sd_sym->st_value;
883 
884 		/*
885 		 * Relocation against the GLOBAL_OFFSET_TABLE.
886 		 */
887 		if ((arsp->rel_flags & FLG_REL_GOT) &&
888 		    !ld_reloc_set_aux_osdesc(ofl, arsp, ofl->ofl_osgot))
889 			return (S_ERROR);
890 		osp = RELAUX_GET_OSDESC(arsp);
891 
892 		/*
893 		 * If loadable and not producing a relocatable object add the
894 		 * sections virtual address to the reference address.
895 		 */
896 		if ((arsp->rel_flags & FLG_REL_LOAD) &&
897 		    ((flags & FLG_OF_RELOBJ) == 0))
898 			refaddr += arsp->rel_isdesc->is_osdesc->
899 			    os_shdr->sh_addr;
900 
901 		/*
902 		 * If this entry has a PLT assigned to it, its value is actually
903 		 * the address of the PLT (and not the address of the function).
904 		 */
905 		if (IS_PLT(arsp->rel_rtype)) {
906 			if (sdp->sd_aux && sdp->sd_aux->sa_PLTndx)
907 				value = ld_calc_plt_addr(sdp, ofl);
908 		}
909 
910 		/*
911 		 * Add relocations addend to value.  Add extra
912 		 * relocation addend if needed.
913 		 *
914 		 * Note: For GOT relative relocations on amd64 we discard the
915 		 * addend.  It was relevant to the reference - not to the
916 		 * data item being referenced (ie: that -4 thing).
917 		 */
918 		if ((arsp->rel_flags & FLG_REL_GOT) == 0)
919 			value += arsp->rel_raddend;
920 
921 		/*
922 		 * Determine whether the value needs further adjustment. Filter
923 		 * through the attributes of the relocation to determine what
924 		 * adjustment is required.  Note, many of the following cases
925 		 * are only applicable when a .got is present.  As a .got is
926 		 * not generated when a relocatable object is being built,
927 		 * any adjustments that require a .got need to be skipped.
928 		 */
929 		if ((arsp->rel_flags & FLG_REL_GOT) &&
930 		    ((flags & FLG_OF_RELOBJ) == 0)) {
931 			Xword		R1addr;
932 			uintptr_t	R2addr;
933 			Word		gotndx;
934 			Gotndx		*gnp;
935 
936 			/*
937 			 * Perform relocation against GOT table. Since this
938 			 * doesn't fit exactly into a relocation we place the
939 			 * appropriate byte in the GOT directly
940 			 *
941 			 * Calculate offset into GOT at which to apply
942 			 * the relocation.
943 			 */
944 			gnp = ld_find_got_ndx(sdp->sd_GOTndxs, gref, ofl, arsp);
945 			assert(gnp);
946 
947 			if (arsp->rel_rtype == R_AMD64_DTPOFF64)
948 				gotndx = gnp->gn_gotndx + 1;
949 			else
950 				gotndx = gnp->gn_gotndx;
951 
952 			R1addr = (Xword)(gotndx * M_GOT_ENTSIZE);
953 
954 			/*
955 			 * Add the GOTs data's offset.
956 			 */
957 			R2addr = R1addr + (uintptr_t)osp->os_outdata->d_buf;
958 
959 			DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, ELF_DBG_LD_ACT,
960 			    M_MACH, SHT_RELA, arsp, R1addr, value,
961 			    ld_reloc_sym_name));
962 
963 			/*
964 			 * And do it.
965 			 */
966 			if (ofl->ofl_flags1 & FLG_OF1_ENCDIFF)
967 				*(Xword *)R2addr = ld_bswap_Xword(value);
968 			else
969 				*(Xword *)R2addr = value;
970 			continue;
971 
972 		} else if (IS_GOT_BASED(arsp->rel_rtype) &&
973 		    ((flags & FLG_OF_RELOBJ) == 0)) {
974 			value -= ofl->ofl_osgot->os_shdr->sh_addr;
975 
976 		} else if (IS_GOTPCREL(arsp->rel_rtype) &&
977 		    ((flags & FLG_OF_RELOBJ) == 0)) {
978 			Gotndx *gnp;
979 
980 			/*
981 			 * Calculation:
982 			 *	G + GOT + A - P
983 			 */
984 			gnp = ld_find_got_ndx(sdp->sd_GOTndxs, gref, ofl, arsp);
985 			assert(gnp);
986 			value = (Xword)(ofl->ofl_osgot->os_shdr-> sh_addr) +
987 			    ((Xword)gnp->gn_gotndx * M_GOT_ENTSIZE) +
988 			    arsp->rel_raddend - refaddr;
989 
990 		} else if (IS_GOT_PC(arsp->rel_rtype) &&
991 		    ((flags & FLG_OF_RELOBJ) == 0)) {
992 			value = (Xword)(ofl->ofl_osgot->os_shdr->
993 			    sh_addr) - refaddr + arsp->rel_raddend;
994 
995 		} else if ((IS_PC_RELATIVE(arsp->rel_rtype)) &&
996 		    (((flags & FLG_OF_RELOBJ) == 0) ||
997 		    (osp == sdp->sd_isc->is_osdesc))) {
998 			value -= refaddr;
999 
1000 		} else if (IS_TLS_INS(arsp->rel_rtype) &&
1001 		    IS_GOT_RELATIVE(arsp->rel_rtype) &&
1002 		    ((flags & FLG_OF_RELOBJ) == 0)) {
1003 			Gotndx	*gnp;
1004 
1005 			gnp = ld_find_got_ndx(sdp->sd_GOTndxs, gref, ofl, arsp);
1006 			assert(gnp);
1007 			value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE;
1008 
1009 		} else if (IS_GOT_RELATIVE(arsp->rel_rtype) &&
1010 		    ((flags & FLG_OF_RELOBJ) == 0)) {
1011 			Gotndx *gnp;
1012 
1013 			gnp = ld_find_got_ndx(sdp->sd_GOTndxs, gref, ofl, arsp);
1014 			assert(gnp);
1015 			value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE;
1016 
1017 		} else if ((arsp->rel_flags & FLG_REL_STLS) &&
1018 		    ((flags & FLG_OF_RELOBJ) == 0)) {
1019 			Xword	tlsstatsize;
1020 
1021 			/*
1022 			 * This is the LE TLS reference model.  Static
1023 			 * offset is hard-coded.
1024 			 */
1025 			tlsstatsize = S_ROUND(ofl->ofl_tlsphdr->p_memsz,
1026 			    M_TLSSTATALIGN);
1027 			value = tlsstatsize - value;
1028 
1029 			/*
1030 			 * Since this code is fixed up, it assumes a negative
1031 			 * offset that can be added to the thread pointer.
1032 			 */
1033 			if (arsp->rel_rtype == R_AMD64_TPOFF32)
1034 				value = -value;
1035 		}
1036 
1037 		if (arsp->rel_isdesc->is_file)
1038 			ifl_name = arsp->rel_isdesc->is_file->ifl_name;
1039 		else
1040 			ifl_name = MSG_INTL(MSG_STR_NULL);
1041 
1042 		/*
1043 		 * Make sure we have data to relocate.  Compiler and assembler
1044 		 * developers have been known to generate relocations against
1045 		 * invalid sections (normally .bss), so for their benefit give
1046 		 * them sufficient information to help analyze the problem.
1047 		 * End users should never see this.
1048 		 */
1049 		if (arsp->rel_isdesc->is_indata->d_buf == 0) {
1050 			Conv_inv_buf_t inv_buf;
1051 
1052 			ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_REL_EMPTYSEC),
1053 			    conv_reloc_amd64_type(arsp->rel_rtype, 0, &inv_buf),
1054 			    ifl_name, ld_reloc_sym_name(arsp),
1055 			    EC_WORD(arsp->rel_isdesc->is_scnndx),
1056 			    arsp->rel_isdesc->is_name);
1057 			return (S_ERROR);
1058 		}
1059 
1060 		/*
1061 		 * Get the address of the data item we need to modify.
1062 		 */
1063 		addr = (uchar_t *)((uintptr_t)arsp->rel_roffset +
1064 		    (uintptr_t)_elf_getxoff(arsp->rel_isdesc->is_indata));
1065 
1066 		DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, ELF_DBG_LD_ACT,
1067 		    M_MACH, SHT_RELA, arsp, EC_NATPTR(addr), value,
1068 		    ld_reloc_sym_name));
1069 		addr += (uintptr_t)osp->os_outdata->d_buf;
1070 
1071 		if ((((uintptr_t)addr - (uintptr_t)ofl->ofl_nehdr) >
1072 		    ofl->ofl_size) || (arsp->rel_roffset >
1073 		    osp->os_shdr->sh_size)) {
1074 			int		class;
1075 			Conv_inv_buf_t inv_buf;
1076 
1077 			if (((uintptr_t)addr - (uintptr_t)ofl->ofl_nehdr) >
1078 			    ofl->ofl_size)
1079 				class = ERR_FATAL;
1080 			else
1081 				class = ERR_WARNING;
1082 
1083 			ld_eprintf(ofl, class, MSG_INTL(MSG_REL_INVALOFFSET),
1084 			    conv_reloc_amd64_type(arsp->rel_rtype, 0, &inv_buf),
1085 			    ifl_name, EC_WORD(arsp->rel_isdesc->is_scnndx),
1086 			    arsp->rel_isdesc->is_name, ld_reloc_sym_name(arsp),
1087 			    EC_ADDR((uintptr_t)addr -
1088 			    (uintptr_t)ofl->ofl_nehdr));
1089 
1090 			if (class == ERR_FATAL) {
1091 				return_code = S_ERROR;
1092 				continue;
1093 			}
1094 		}
1095 
1096 		/*
1097 		 * The relocation is additive.  Ignore the previous symbol
1098 		 * value if this local partial symbol is expanded.
1099 		 */
1100 		if (moved)
1101 			value -= *addr;
1102 
1103 		/*
1104 		 * If '-z noreloc' is specified - skip the do_reloc_ld stage.
1105 		 */
1106 		if (OFL_DO_RELOC(ofl)) {
1107 			/*
1108 			 * If this is a PROGBITS section and the running linker
1109 			 * has a different byte order than the target host,
1110 			 * tell do_reloc_ld() to swap bytes.
1111 			 */
1112 			if (do_reloc_ld(arsp, addr, &value, ld_reloc_sym_name,
1113 			    ifl_name, OFL_SWAP_RELOC_DATA(ofl, arsp),
1114 			    ofl->ofl_lml) == 0) {
1115 				ofl->ofl_flags |= FLG_OF_FATAL;
1116 				return_code = S_ERROR;
1117 			}
1118 		}
1119 	}
1120 	return (return_code);
1121 }
1122 
1123 static uintptr_t
ld_add_outrel(Word flags,Rel_desc * rsp,Ofl_desc * ofl)1124 ld_add_outrel(Word flags, Rel_desc *rsp, Ofl_desc *ofl)
1125 {
1126 	Rel_desc	*orsp;
1127 	Sym_desc	*sdp = rsp->rel_sym;
1128 
1129 	/*
1130 	 * Static executables *do not* want any relocations against them.
1131 	 * Since our engine still creates relocations against a WEAK UNDEFINED
1132 	 * symbol in a static executable, it's best to disable them here
1133 	 * instead of through out the relocation code.
1134 	 */
1135 	if (OFL_IS_STATIC_EXEC(ofl))
1136 		return (1);
1137 
1138 	/*
1139 	 * If we are adding a output relocation against a section
1140 	 * symbol (non-RELATIVE) then mark that section.  These sections
1141 	 * will be added to the .dynsym symbol table.
1142 	 */
1143 	if (sdp && (rsp->rel_rtype != M_R_RELATIVE) &&
1144 	    ((flags & FLG_REL_SCNNDX) ||
1145 	    (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION))) {
1146 
1147 		/*
1148 		 * If this is a COMMON symbol - no output section
1149 		 * exists yet - (it's created as part of sym_validate()).
1150 		 * So - we mark here that when it's created it should
1151 		 * be tagged with the FLG_OS_OUTREL flag.
1152 		 */
1153 		if ((sdp->sd_flags & FLG_SY_SPECSEC) &&
1154 		    (sdp->sd_sym->st_shndx == SHN_COMMON)) {
1155 			if (ELF_ST_TYPE(sdp->sd_sym->st_info) != STT_TLS)
1156 				ofl->ofl_flags1 |= FLG_OF1_BSSOREL;
1157 			else
1158 				ofl->ofl_flags1 |= FLG_OF1_TLSOREL;
1159 		} else {
1160 			Os_desc *osp;
1161 			Is_desc *isp = sdp->sd_isc;
1162 
1163 			if (isp && ((osp = isp->is_osdesc) != NULL) &&
1164 			    ((osp->os_flags & FLG_OS_OUTREL) == 0)) {
1165 				ofl->ofl_dynshdrcnt++;
1166 				osp->os_flags |= FLG_OS_OUTREL;
1167 			}
1168 		}
1169 	}
1170 
1171 	/* Enter it into the output relocation cache */
1172 	if ((orsp = ld_reloc_enter(ofl, &ofl->ofl_outrels, rsp, flags)) == NULL)
1173 		return (S_ERROR);
1174 
1175 	if (flags & FLG_REL_GOT)
1176 		ofl->ofl_relocgotsz += (Xword)sizeof (Rela);
1177 	else if (flags & FLG_REL_PLT)
1178 		ofl->ofl_relocpltsz += (Xword)sizeof (Rela);
1179 	else if (flags & FLG_REL_BSS)
1180 		ofl->ofl_relocbsssz += (Xword)sizeof (Rela);
1181 	else if (flags & FLG_REL_NOINFO)
1182 		ofl->ofl_relocrelsz += (Xword)sizeof (Rela);
1183 	else
1184 		RELAUX_GET_OSDESC(orsp)->os_szoutrels += (Xword)sizeof (Rela);
1185 
1186 	if (orsp->rel_rtype == M_R_RELATIVE)
1187 		ofl->ofl_relocrelcnt++;
1188 
1189 	/*
1190 	 * We don't perform sorting on PLT relocations because
1191 	 * they have already been assigned a PLT index and if we
1192 	 * were to sort them we would have to re-assign the plt indexes.
1193 	 */
1194 	if (!(flags & FLG_REL_PLT))
1195 		ofl->ofl_reloccnt++;
1196 
1197 	/*
1198 	 * Insure a GLOBAL_OFFSET_TABLE is generated if required.
1199 	 */
1200 	if (IS_GOT_REQUIRED(orsp->rel_rtype))
1201 		ofl->ofl_flags |= FLG_OF_BLDGOT;
1202 
1203 	/*
1204 	 * Identify and possibly warn of a displacement relocation.
1205 	 */
1206 	if (orsp->rel_flags & FLG_REL_DISP) {
1207 		ofl->ofl_dtflags_1 |= DF_1_DISPRELPND;
1208 
1209 		if (ofl->ofl_flags & FLG_OF_VERBOSE)
1210 			ld_disp_errmsg(MSG_INTL(MSG_REL_DISPREL4), orsp, ofl);
1211 	}
1212 	DBG_CALL(Dbg_reloc_ors_entry(ofl->ofl_lml, ELF_DBG_LD, SHT_RELA,
1213 	    M_MACH, orsp));
1214 	return (1);
1215 }
1216 
1217 /*
1218  * process relocation for a LOCAL symbol
1219  */
1220 static uintptr_t
ld_reloc_local(Rel_desc * rsp,Ofl_desc * ofl)1221 ld_reloc_local(Rel_desc * rsp, Ofl_desc * ofl)
1222 {
1223 	ofl_flag_t	flags = ofl->ofl_flags;
1224 	Sym_desc	*sdp = rsp->rel_sym;
1225 	Word		shndx = sdp->sd_sym->st_shndx;
1226 	Word		ortype = rsp->rel_rtype;
1227 
1228 	/*
1229 	 * if ((shared object) and (not pc relative relocation) and
1230 	 *    (not against ABS symbol))
1231 	 * then
1232 	 *	build R_AMD64_RELATIVE
1233 	 * fi
1234 	 */
1235 	if ((flags & FLG_OF_SHAROBJ) && (rsp->rel_flags & FLG_REL_LOAD) &&
1236 	    !(IS_PC_RELATIVE(rsp->rel_rtype)) && !(IS_SIZE(rsp->rel_rtype)) &&
1237 	    !(IS_GOT_BASED(rsp->rel_rtype)) &&
1238 	    !(rsp->rel_isdesc != NULL &&
1239 	    (rsp->rel_isdesc->is_shdr->sh_type == SHT_SUNW_dof)) &&
1240 	    (((sdp->sd_flags & FLG_SY_SPECSEC) == 0) ||
1241 	    (shndx != SHN_ABS) || (sdp->sd_aux && sdp->sd_aux->sa_symspec))) {
1242 
1243 		/*
1244 		 * R_AMD64_RELATIVE updates a 64bit address, if this
1245 		 * relocation isn't a 64bit binding then we can not
1246 		 * simplify it to a RELATIVE relocation.
1247 		 */
1248 		if (reloc_table[ortype].re_fsize != sizeof (Addr)) {
1249 			return (ld_add_outrel(0, rsp, ofl));
1250 		}
1251 
1252 		rsp->rel_rtype = R_AMD64_RELATIVE;
1253 		if (ld_add_outrel(FLG_REL_ADVAL, rsp, ofl) == S_ERROR)
1254 			return (S_ERROR);
1255 		rsp->rel_rtype = ortype;
1256 		return (1);
1257 	}
1258 
1259 	/*
1260 	 * If the relocation is against a 'non-allocatable' section
1261 	 * and we can not resolve it now - then give a warning
1262 	 * message.
1263 	 *
1264 	 * We can not resolve the symbol if either:
1265 	 *	a) it's undefined
1266 	 *	b) it's defined in a shared library and a
1267 	 *	   COPY relocation hasn't moved it to the executable
1268 	 *
1269 	 * Note: because we process all of the relocations against the
1270 	 *	text segment before any others - we know whether
1271 	 *	or not a copy relocation will be generated before
1272 	 *	we get here (see reloc_init()->reloc_segments()).
1273 	 */
1274 	if (!(rsp->rel_flags & FLG_REL_LOAD) &&
1275 	    ((shndx == SHN_UNDEF) ||
1276 	    ((sdp->sd_ref == REF_DYN_NEED) &&
1277 	    ((sdp->sd_flags & FLG_SY_MVTOCOMM) == 0)))) {
1278 		Conv_inv_buf_t	inv_buf;
1279 		Os_desc		*osp = RELAUX_GET_OSDESC(rsp);
1280 
1281 		/*
1282 		 * If the relocation is against a SHT_SUNW_ANNOTATE
1283 		 * section - then silently ignore that the relocation
1284 		 * can not be resolved.
1285 		 */
1286 		if (osp && (osp->os_shdr->sh_type == SHT_SUNW_ANNOTATE))
1287 			return (0);
1288 		ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_REL_EXTERNSYM),
1289 		    conv_reloc_amd64_type(rsp->rel_rtype, 0, &inv_buf),
1290 		    rsp->rel_isdesc->is_file->ifl_name,
1291 		    ld_reloc_sym_name(rsp), osp->os_name);
1292 		return (1);
1293 	}
1294 
1295 	/*
1296 	 * Perform relocation.
1297 	 */
1298 	return (ld_add_actrel(NULL, rsp, ofl));
1299 }
1300 
1301 
1302 static uintptr_t
ld_reloc_TLS(Boolean local,Rel_desc * rsp,Ofl_desc * ofl)1303 ld_reloc_TLS(Boolean local, Rel_desc * rsp, Ofl_desc * ofl)
1304 {
1305 	Word		rtype = rsp->rel_rtype;
1306 	Sym_desc	*sdp = rsp->rel_sym;
1307 	ofl_flag_t	flags = ofl->ofl_flags;
1308 	Gotndx		*gnp;
1309 
1310 	/*
1311 	 * If we're building an executable - use either the IE or LE access
1312 	 * model.  If we're building a shared object process any IE model.
1313 	 */
1314 	if ((flags & FLG_OF_EXEC) || (IS_TLS_IE(rtype))) {
1315 		/*
1316 		 * Set the DF_STATIC_TLS flag.
1317 		 */
1318 		ofl->ofl_dtflags |= DF_STATIC_TLS;
1319 
1320 		if (!local || ((flags & FLG_OF_EXEC) == 0)) {
1321 			/*
1322 			 * Assign a GOT entry for static TLS references.
1323 			 */
1324 			if ((gnp = ld_find_got_ndx(sdp->sd_GOTndxs,
1325 			    GOT_REF_TLSIE, ofl, rsp)) == NULL) {
1326 
1327 				if (ld_assign_got_TLS(local, rsp, ofl, sdp,
1328 				    gnp, GOT_REF_TLSIE, FLG_REL_STLS,
1329 				    rtype, R_AMD64_TPOFF64, 0) == S_ERROR)
1330 					return (S_ERROR);
1331 			}
1332 
1333 			/*
1334 			 * IE access model.
1335 			 */
1336 			if (IS_TLS_IE(rtype))
1337 				return (ld_add_actrel(FLG_REL_STLS, rsp, ofl));
1338 
1339 			/*
1340 			 * Fixups are required for other executable models.
1341 			 */
1342 			return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS),
1343 			    rsp, ofl));
1344 		}
1345 
1346 		/*
1347 		 * LE access model.
1348 		 */
1349 		if (IS_TLS_LE(rtype))
1350 			return (ld_add_actrel(FLG_REL_STLS, rsp, ofl));
1351 
1352 		return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS),
1353 		    rsp, ofl));
1354 	}
1355 
1356 	/*
1357 	 * Building a shared object.
1358 	 *
1359 	 * Assign a GOT entry for a dynamic TLS reference.
1360 	 */
1361 	if (IS_TLS_LD(rtype) && ((gnp = ld_find_got_ndx(sdp->sd_GOTndxs,
1362 	    GOT_REF_TLSLD, ofl, rsp)) == NULL)) {
1363 
1364 		if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSLD,
1365 		    FLG_REL_MTLS, rtype, R_AMD64_DTPMOD64, NULL) == S_ERROR)
1366 			return (S_ERROR);
1367 
1368 	} else if (IS_TLS_GD(rtype) &&
1369 	    ((gnp = ld_find_got_ndx(sdp->sd_GOTndxs, GOT_REF_TLSGD,
1370 	    ofl, rsp)) == NULL)) {
1371 
1372 		if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSGD,
1373 		    FLG_REL_DTLS, rtype, R_AMD64_DTPMOD64,
1374 		    R_AMD64_DTPOFF64) == S_ERROR)
1375 			return (S_ERROR);
1376 	}
1377 
1378 	if (IS_TLS_LD(rtype))
1379 		return (ld_add_actrel(FLG_REL_MTLS, rsp, ofl));
1380 
1381 	return (ld_add_actrel(FLG_REL_DTLS, rsp, ofl));
1382 }
1383 
1384 /* ARGSUSED5 */
1385 static uintptr_t
ld_assign_got_ndx(Alist ** alpp,Gotndx * pgnp,Gotref gref,Ofl_desc * ofl,Rel_desc * rsp,Sym_desc * sdp)1386 ld_assign_got_ndx(Alist **alpp, Gotndx *pgnp, Gotref gref, Ofl_desc *ofl,
1387     Rel_desc *rsp, Sym_desc *sdp)
1388 {
1389 	Xword		raddend;
1390 	Gotndx		gn, *gnp;
1391 	Aliste		idx;
1392 	uint_t		gotents;
1393 
1394 	raddend = rsp->rel_raddend;
1395 	if (pgnp && (pgnp->gn_addend == raddend) && (pgnp->gn_gotref == gref))
1396 		return (1);
1397 
1398 	if ((gref == GOT_REF_TLSGD) || (gref == GOT_REF_TLSLD))
1399 		gotents = 2;
1400 	else
1401 		gotents = 1;
1402 
1403 	gn.gn_addend = raddend;
1404 	gn.gn_gotndx = ofl->ofl_gotcnt;
1405 	gn.gn_gotref = gref;
1406 
1407 	ofl->ofl_gotcnt += gotents;
1408 
1409 	if (gref == GOT_REF_TLSLD) {
1410 		if (ofl->ofl_tlsldgotndx == NULL) {
1411 			if ((gnp = libld_malloc(sizeof (Gotndx))) == NULL)
1412 				return (S_ERROR);
1413 			(void) memcpy(gnp, &gn, sizeof (Gotndx));
1414 			ofl->ofl_tlsldgotndx = gnp;
1415 		}
1416 		return (1);
1417 	}
1418 
1419 	idx = 0;
1420 	for (ALIST_TRAVERSE(*alpp, idx, gnp)) {
1421 		if (gnp->gn_addend > raddend)
1422 			break;
1423 	}
1424 
1425 	/*
1426 	 * GOT indexes are maintained on an Alist, where there is typically
1427 	 * only one index.  The usage of this list is to scan the list to find
1428 	 * an index, and then apply that index immediately to a relocation.
1429 	 * Thus there are no external references to these GOT index structures
1430 	 * that can be compromised by the Alist being reallocated.
1431 	 */
1432 	if (alist_insert(alpp, &gn, sizeof (Gotndx),
1433 	    AL_CNT_SDP_GOT, idx) == NULL)
1434 		return (S_ERROR);
1435 
1436 	return (1);
1437 }
1438 
1439 static void
ld_assign_plt_ndx(Sym_desc * sdp,Ofl_desc * ofl)1440 ld_assign_plt_ndx(Sym_desc * sdp, Ofl_desc *ofl)
1441 {
1442 	sdp->sd_aux->sa_PLTndx = 1 + ofl->ofl_pltcnt++;
1443 	sdp->sd_aux->sa_PLTGOTndx = ofl->ofl_gotcnt++;
1444 	ofl->ofl_flags |= FLG_OF_BLDGOT;
1445 }
1446 
1447 static uchar_t plt0_template[M_PLT_ENTSIZE] = {
1448 /* 0x00 PUSHQ GOT+8(%rip) */	0xff, 0x35, 0x00, 0x00, 0x00, 0x00,
1449 /* 0x06 JMP   *GOT+16(%rip) */	0xff, 0x25, 0x00, 0x00, 0x00, 0x00,
1450 /* 0x0c NOP */			0x90,
1451 /* 0x0d NOP */			0x90,
1452 /* 0x0e NOP */			0x90,
1453 /* 0x0f NOP */			0x90
1454 };
1455 
1456 /*
1457  * Initializes .got[0] with the _DYNAMIC symbol value.
1458  */
1459 static uintptr_t
ld_fillin_gotplt(Ofl_desc * ofl)1460 ld_fillin_gotplt(Ofl_desc *ofl)
1461 {
1462 	int	bswap = (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) != 0;
1463 
1464 	if (ofl->ofl_osgot) {
1465 		Sym_desc	*sdp;
1466 
1467 		if ((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_DYNAMIC_U),
1468 		    SYM_NOHASH, NULL, ofl)) != NULL) {
1469 			uchar_t	*genptr;
1470 
1471 			genptr = ((uchar_t *)ofl->ofl_osgot->os_outdata->d_buf +
1472 			    (M_GOT_XDYNAMIC * M_GOT_ENTSIZE));
1473 			/* LINTED */
1474 			*(Xword *)genptr = sdp->sd_sym->st_value;
1475 			if (bswap)
1476 				/* LINTED */
1477 				*(Xword *)genptr =
1478 				    /* LINTED */
1479 				    ld_bswap_Xword(*(Xword *)genptr);
1480 		}
1481 	}
1482 
1483 	/*
1484 	 * Fill in the reserved slot in the procedure linkage table the first
1485 	 * entry is:
1486 	 *	0x00 PUSHQ	GOT+8(%rip)	    # GOT[1]
1487 	 *	0x06 JMP	*GOT+16(%rip)	    # GOT[2]
1488 	 *	0x0c NOP
1489 	 *	0x0d NOP
1490 	 *	0x0e NOP
1491 	 *	0x0f NOP
1492 	 */
1493 	if ((ofl->ofl_flags & FLG_OF_DYNAMIC) && ofl->ofl_osplt) {
1494 		uchar_t	*pltent;
1495 		Xword	val1;
1496 
1497 		pltent = (uchar_t *)ofl->ofl_osplt->os_outdata->d_buf;
1498 		bcopy(plt0_template, pltent, sizeof (plt0_template));
1499 
1500 		/*
1501 		 * If '-z noreloc' is specified - skip the do_reloc_ld
1502 		 * stage.
1503 		 */
1504 		if (!OFL_DO_RELOC(ofl))
1505 			return (1);
1506 
1507 		/*
1508 		 * filin:
1509 		 *	PUSHQ GOT + 8(%rip)
1510 		 *
1511 		 * Note: 0x06 below represents the offset to the
1512 		 *	 next instruction - which is what %rip will
1513 		 *	 be pointing at.
1514 		 */
1515 		val1 = (ofl->ofl_osgot->os_shdr->sh_addr) +
1516 		    (M_GOT_XLINKMAP * M_GOT_ENTSIZE) -
1517 		    ofl->ofl_osplt->os_shdr->sh_addr - 0x06;
1518 
1519 		if (do_reloc_ld(&rdesc_r_amd64_gotpcrel, &pltent[0x02],
1520 		    &val1, syn_rdesc_sym_name, MSG_ORIG(MSG_SPECFIL_PLTENT),
1521 		    bswap, ofl->ofl_lml) == 0) {
1522 			ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_PLT_PLT0FAIL));
1523 			return (S_ERROR);
1524 		}
1525 
1526 		/*
1527 		 * filin:
1528 		 *  JMP	*GOT+16(%rip)
1529 		 */
1530 		val1 = (ofl->ofl_osgot->os_shdr->sh_addr) +
1531 		    (M_GOT_XRTLD * M_GOT_ENTSIZE) -
1532 		    ofl->ofl_osplt->os_shdr->sh_addr - 0x0c;
1533 
1534 		if (do_reloc_ld(&rdesc_r_amd64_gotpcrel, &pltent[0x08],
1535 		    &val1, syn_rdesc_sym_name, MSG_ORIG(MSG_SPECFIL_PLTENT),
1536 		    bswap, ofl->ofl_lml) == 0) {
1537 			ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_PLT_PLT0FAIL));
1538 			return (S_ERROR);
1539 		}
1540 	}
1541 
1542 	return (1);
1543 }
1544 
1545 
1546 
1547 /*
1548  * Template for generating "void (*)(void)" function
1549  */
1550 static const uchar_t nullfunc_tmpl[] = {	/* amd64 */
1551 /* 0x00 */	0x55,				/* pushq  %rbp */
1552 /* 0x01 */	0x48, 0x8b, 0xec,		/* movq   %rsp,%rbp */
1553 /* 0x04 */	0x48, 0x8b, 0xe5,		/* movq   %rbp,%rsp */
1554 /* 0x07 */	0x5d,				/* popq   %rbp */
1555 /* 0x08 */	0xc3				/* ret */
1556 };
1557 
1558 
1559 /*
1560  * Function used to provide fill padding in SHF_EXECINSTR sections
1561  *
1562  * entry:
1563  *
1564  *	base - base address of section being filled
1565  *	offset - starting offset for fill within memory referenced by base
1566  *	cnt - # bytes to be filled
1567  *
1568  * exit:
1569  *	The fill has been completed.
1570  */
1571 static void
execfill(void * base,off_t off,size_t cnt)1572 execfill(void *base, off_t off, size_t cnt)
1573 {
1574 	/*
1575 	 * 0x90 is an X86 NOP instruction in both 32 and 64-bit worlds.
1576 	 * There are no alignment constraints.
1577 	 */
1578 	(void) memset(off + (char *)base, 0x90, cnt);
1579 }
1580 
1581 
1582 /*
1583  * Return the ld_targ definition for this target.
1584  */
1585 const Target *
ld_targ_init_x86(void)1586 ld_targ_init_x86(void)
1587 {
1588 	static const Target _ld_targ = {
1589 		{			/* Target_mach */
1590 			M_MACH,			/* m_mach */
1591 			M_MACHPLUS,		/* m_machplus */
1592 			M_FLAGSPLUS,		/* m_flagsplus */
1593 			M_CLASS,		/* m_class */
1594 			M_DATA,			/* m_data */
1595 
1596 			M_SEGM_ALIGN,		/* m_segm_align */
1597 			M_SEGM_ORIGIN,		/* m_segm_origin */
1598 			M_SEGM_AORIGIN,		/* m_segm_aorigin */
1599 			M_DATASEG_PERM,		/* m_dataseg_perm */
1600 			M_STACK_PERM,		/* m_stack_perm */
1601 			M_WORD_ALIGN,		/* m_word_align */
1602 			MSG_ORIG(MSG_PTH_RTLD_AMD64), /* m_def_interp */
1603 
1604 			/* Relocation type codes */
1605 			M_R_ARRAYADDR,		/* m_r_arrayaddr */
1606 			M_R_COPY,		/* m_r_copy */
1607 			M_R_GLOB_DAT,		/* m_r_glob_dat */
1608 			M_R_JMP_SLOT,		/* m_r_jmp_slot */
1609 			M_R_NUM,		/* m_r_num */
1610 			M_R_NONE,		/* m_r_none */
1611 			M_R_RELATIVE,		/* m_r_relative */
1612 			M_R_REGISTER,		/* m_r_register */
1613 
1614 			/* Relocation related constants */
1615 			M_REL_DT_COUNT,		/* m_rel_dt_count */
1616 			M_REL_DT_ENT,		/* m_rel_dt_ent */
1617 			M_REL_DT_SIZE,		/* m_rel_dt_size */
1618 			M_REL_DT_TYPE,		/* m_rel_dt_type */
1619 			M_REL_SHT_TYPE,		/* m_rel_sht_type */
1620 
1621 			/* GOT related constants */
1622 			M_GOT_ENTSIZE,		/* m_got_entsize */
1623 			M_GOT_XNumber,		/* m_got_xnumber */
1624 
1625 			/* PLT related constants */
1626 			M_PLT_ALIGN,		/* m_plt_align */
1627 			M_PLT_ENTSIZE,		/* m_plt_entsize */
1628 			M_PLT_RESERVSZ,		/* m_plt_reservsz */
1629 			M_PLT_SHF_FLAGS,	/* m_plt_shf_flags */
1630 
1631 			/* Section type of .eh_frame/.eh_frame_hdr sections */
1632 			SHT_AMD64_UNWIND,	/* m_sht_unwind */
1633 
1634 			M_DT_REGISTER,		/* m_dt_register */
1635 		},
1636 		{			/* Target_machid */
1637 			M_ID_ARRAY,		/* id_array */
1638 			M_ID_BSS,		/* id_bss */
1639 			M_ID_CAP,		/* id_cap */
1640 			M_ID_CAPINFO,		/* id_capinfo */
1641 			M_ID_CAPCHAIN,		/* id_capchain */
1642 			M_ID_DATA,		/* id_data */
1643 			M_ID_DYNAMIC,		/* id_dynamic */
1644 			M_ID_DYNSORT,		/* id_dynsort */
1645 			M_ID_DYNSTR,		/* id_dynstr */
1646 			M_ID_DYNSYM,		/* id_dynsym */
1647 			M_ID_DYNSYM_NDX,	/* id_dynsym_ndx */
1648 			M_ID_GOT,		/* id_got */
1649 			M_ID_UNKNOWN,		/* id_gotdata (unused) */
1650 			M_ID_HASH,		/* id_hash */
1651 			M_ID_INTERP,		/* id_interp */
1652 			M_ID_LBSS,		/* id_lbss */
1653 			M_ID_LDYNSYM,		/* id_ldynsym */
1654 			M_ID_NOTE,		/* id_note */
1655 			M_ID_NULL,		/* id_null */
1656 			M_ID_PLT,		/* id_plt */
1657 			M_ID_REL,		/* id_rel */
1658 			M_ID_STRTAB,		/* id_strtab */
1659 			M_ID_SYMINFO,		/* id_syminfo */
1660 			M_ID_SYMTAB,		/* id_symtab */
1661 			M_ID_SYMTAB_NDX,	/* id_symtab_ndx */
1662 			M_ID_TEXT,		/* id_text */
1663 			M_ID_TLS,		/* id_tls */
1664 			M_ID_TLSBSS,		/* id_tlsbss */
1665 			M_ID_UNKNOWN,		/* id_unknown */
1666 			M_ID_UNWIND,		/* id_unwind */
1667 			M_ID_UNWINDHDR,		/* id_unwindhdr */
1668 			M_ID_USER,		/* id_user */
1669 			M_ID_VERSION,		/* id_version */
1670 		},
1671 		{			/* Target_nullfunc */
1672 			nullfunc_tmpl,		/* nf_template */
1673 			sizeof (nullfunc_tmpl),	/* nf_size */
1674 		},
1675 		{			/* Target_fillfunc */
1676 			execfill		/* ff_execfill */
1677 		},
1678 		{			/* Target_machrel */
1679 			reloc_table,
1680 
1681 			ld_init_rel,		/* mr_init_rel */
1682 			ld_mach_eflags,		/* mr_mach_eflags */
1683 			ld_mach_make_dynamic,	/* mr_mach_make_dynamic */
1684 			ld_mach_update_odynamic, /* mr_mach_update_odynamic */
1685 			ld_calc_plt_addr,	/* mr_calc_plt_addr */
1686 			ld_perform_outreloc,	/* mr_perform_outreloc */
1687 			ld_do_activerelocs,	/* mr_do_activerelocs */
1688 			ld_add_outrel,		/* mr_add_outrel */
1689 			NULL,			/* mr_reloc_register */
1690 			ld_reloc_local,		/* mr_reloc_local */
1691 			NULL,			/* mr_reloc_GOTOP */
1692 			ld_reloc_TLS,		/* mr_reloc_TLS */
1693 			NULL,			/* mr_assign_got */
1694 			ld_find_got_ndx,	/* mr_find_got_ndx */
1695 			ld_calc_got_offset,	/* mr_calc_got_offset */
1696 			ld_assign_got_ndx,	/* mr_assign_got_ndx */
1697 			ld_assign_plt_ndx,	/* mr_assign_plt_ndx */
1698 			NULL,			/* mr_allocate_got */
1699 			ld_fillin_gotplt,	/* mr_fillin_gotplt */
1700 		},
1701 		{			/* Target_machsym */
1702 			NULL,			/* ms_reg_check */
1703 			NULL,			/* ms_mach_sym_typecheck */
1704 			NULL,			/* ms_is_regsym */
1705 			NULL,			/* ms_reg_find */
1706 			NULL			/* ms_reg_enter */
1707 		}
1708 	};
1709 
1710 	return (&_ld_targ);
1711 }
1712