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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  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
23  * Use is subject to license terms.
24  */
25
26 #pragma ident   "%Z%%M% %I%     %E% SMI"
27
28 /*
29  * Routines for preparing tdata trees for conversion into CTF data, and
30  * for placing the resulting data into an output file.
31  */
32
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <strings.h>
36 #include <sys/types.h>
37 #include <sys/stat.h>
38 #include <fcntl.h>
39 #include <libelf.h>
40 #include <gelf.h>
41 #include <unistd.h>
42
43 #include "ctftools.h"
44 #include "list.h"
45 #include "memory.h"
46 #include "traverse.h"
47 #include "symbol.h"
48
49 typedef struct iidesc_match {
50         int iim_fuzzy;
51         iidesc_t *iim_ret;
52         char *iim_name;
53         char *iim_file;
54         uchar_t iim_bind;
55 } iidesc_match_t;
56
57 static int
58 burst_iitypes(void *data, void *arg)
59 {
60         iidesc_t *ii = data;
61         iiburst_t *iiburst = arg;
62
63         switch (ii->ii_type) {
64         case II_GFUN:
65         case II_SFUN:
66         case II_GVAR:
67         case II_SVAR:
68                 if (!(ii->ii_flags & IIDESC_F_USED))
69                         return (0);
70                 break;
71         default:
72                 break;
73         }
74
75         ii->ii_dtype->t_flags |= TDESC_F_ISROOT;
76         (void) iitraverse_td(ii, iiburst->iib_tdtd);
77         return (1);
78 }
79
80 /*ARGSUSED1*/
81 static int
82 save_type_by_id(tdesc_t *tdp, tdesc_t **tdpp __unused, void *private)
83 {
84         iiburst_t *iiburst = private;
85
86         /*
87          * Doing this on every node is horribly inefficient, but given that
88          * we may be suppressing some types, we can't trust nextid in the
89          * tdata_t.
90          */
91         if (tdp->t_id > iiburst->iib_maxtypeid)
92                 iiburst->iib_maxtypeid = tdp->t_id;
93
94         slist_add(&iiburst->iib_types, tdp, tdesc_idcmp);
95
96         return (1);
97 }
98
99 static tdtrav_cb_f burst_types_cbs[] = {
100         NULL,
101         save_type_by_id,        /* intrinsic */
102         save_type_by_id,        /* pointer */
103         save_type_by_id,        /* array */
104         save_type_by_id,        /* function */
105         save_type_by_id,        /* struct */
106         save_type_by_id,        /* union */
107         save_type_by_id,        /* enum */
108         save_type_by_id,        /* forward */
109         save_type_by_id,        /* typedef */
110         tdtrav_assert,          /* typedef_unres */
111         save_type_by_id,        /* volatile */
112         save_type_by_id,        /* const */
113         save_type_by_id         /* restrict */
114 };
115
116
117 static iiburst_t *
118 iiburst_new(tdata_t *td, int max)
119 {
120         iiburst_t *iiburst = xcalloc(sizeof (iiburst_t));
121         iiburst->iib_td = td;
122         iiburst->iib_funcs = xcalloc(sizeof (iidesc_t *) * max);
123         iiburst->iib_nfuncs = 0;
124         iiburst->iib_objts = xcalloc(sizeof (iidesc_t *) * max);
125         iiburst->iib_nobjts = 0;
126         return (iiburst);
127 }
128
129 static void
130 iiburst_types(iiburst_t *iiburst)
131 {
132         tdtrav_data_t tdtd;
133
134         tdtrav_init(&tdtd, &iiburst->iib_td->td_curvgen, NULL, burst_types_cbs,
135             NULL, (void *)iiburst);
136
137         iiburst->iib_tdtd = &tdtd;
138
139         (void) hash_iter(iiburst->iib_td->td_iihash, burst_iitypes, iiburst);
140 }
141
142 static void
143 iiburst_free(iiburst_t *iiburst)
144 {
145         free(iiburst->iib_funcs);
146         free(iiburst->iib_objts);
147         list_free(iiburst->iib_types, NULL, NULL);
148         free(iiburst);
149 }
150
151 /*
152  * See if this iidesc matches the ELF symbol data we pass in.
153  *
154  * A fuzzy match is where we have a local symbol matching the name of a
155  * global type description. This is common when a mapfile is used for a
156  * DSO, but we don't accept it by default.
157  *
158  * A weak fuzzy match is when a weak symbol was resolved and matched to
159  * a global type description.
160  */
161 static int
162 matching_iidesc(void *arg1, void *arg2)
163 {
164         iidesc_t *iidesc = arg1;
165         iidesc_match_t *match = arg2;
166         if (streq(iidesc->ii_name, match->iim_name) == 0)
167                 return (0);
168
169         switch (iidesc->ii_type) {
170         case II_GFUN:
171         case II_GVAR:
172                 if (match->iim_bind == STB_GLOBAL) {
173                         match->iim_ret = iidesc;
174                         return (-1);
175                 } else if (match->iim_fuzzy && match->iim_ret == NULL) {
176                         match->iim_ret = iidesc;
177                         /* continue to look for strong match */
178                         return (0);
179                 }
180                 break;
181         case II_SFUN:
182         case II_SVAR:
183                 if (match->iim_bind == STB_LOCAL &&
184                     match->iim_file != NULL &&
185                     streq(iidesc->ii_owner, match->iim_file)) {
186                         match->iim_ret = iidesc;
187                         return (-1);
188                 }
189                 break;
190         default:
191                 break;
192         }
193         return (0);
194 }
195
196 static iidesc_t *
197 find_iidesc(tdata_t *td, iidesc_match_t *match)
198 {
199         match->iim_ret = NULL;
200         iter_iidescs_by_name(td, match->iim_name,
201             matching_iidesc, match);
202         return (match->iim_ret);
203 }
204
205 /*
206  * If we have a weak symbol, attempt to find the strong symbol it will
207  * resolve to.  Note: the code where this actually happens is in
208  * sym_process() in cmd/sgs/libld/common/syms.c
209  *
210  * Finding the matching symbol is unfortunately not trivial.  For a
211  * symbol to be a candidate, it must:
212  *
213  * - have the same type (function, object)
214  * - have the same value (address)
215  * - have the same size
216  * - not be another weak symbol
217  * - belong to the same section (checked via section index)
218  *
219  * If such a candidate is global, then we assume we've found it.  The
220  * linker generates the symbol table such that the curfile might be
221  * incorrect; this is OK for global symbols, since find_iidesc() doesn't
222  * need to check for the source file for the symbol.
223  *
224  * We might have found a strong local symbol, where the curfile is
225  * accurate and matches that of the weak symbol.  We assume this is a
226  * reasonable match.
227  *
228  * If we've got a local symbol with a non-matching curfile, there are
229  * two possibilities.  Either this is a completely different symbol, or
230  * it's a once-global symbol that was scoped to local via a mapfile.  In
231  * the latter case, curfile is likely inaccurate since the linker does
232  * not preserve the needed curfile in the order of the symbol table (see
233  * the comments about locally scoped symbols in libld's update_osym()).
234  * As we can't tell this case from the former one, we use this symbol
235  * iff no other matching symbol is found.
236  *
237  * What we really need here is a SUNW section containing weak<->strong
238  * mappings that we can consume.
239  */
240 static int
241 check_for_weak(GElf_Sym *weak, char const *weakfile,
242     Elf_Data *data, int nent, Elf_Data *strdata,
243     GElf_Sym *retsym, char **curfilep)
244 {
245         char *curfile = NULL;
246         char *tmpfile1 = NULL;
247         GElf_Sym tmpsym;
248         int candidate = 0;
249         int i;
250         tmpsym.st_info = 0;
251         tmpsym.st_name = 0;
252
253         if (GELF_ST_BIND(weak->st_info) != STB_WEAK)
254                 return (0);
255
256         for (i = 0; i < nent; i++) {
257                 GElf_Sym sym;
258                 uchar_t type;
259
260                 if (gelf_getsym(data, i, &sym) == NULL)
261                         continue;
262
263                 type = GELF_ST_TYPE(sym.st_info);
264
265                 if (type == STT_FILE)
266                         curfile = (char *)strdata->d_buf + sym.st_name;
267
268                 if (GELF_ST_TYPE(weak->st_info) != type ||
269                     weak->st_value != sym.st_value)
270                         continue;
271
272                 if (weak->st_size != sym.st_size)
273                         continue;
274
275                 if (GELF_ST_BIND(sym.st_info) == STB_WEAK)
276                         continue;
277
278                 if (sym.st_shndx != weak->st_shndx)
279                         continue;
280
281                 if (GELF_ST_BIND(sym.st_info) == STB_LOCAL &&
282                     (curfile == NULL || weakfile == NULL ||
283                     strcmp(curfile, weakfile) != 0)) {
284                         candidate = 1;
285                         tmpfile1 = curfile;
286                         tmpsym = sym;
287                         continue;
288                 }
289
290                 *curfilep = curfile;
291                 *retsym = sym;
292                 return (1);
293         }
294
295         if (candidate) {
296                 *curfilep = tmpfile1;
297                 *retsym = tmpsym;
298                 return (1);
299         }
300
301         return (0);
302 }
303
304 /*
305  * When we've found the underlying symbol's type description
306  * for a weak symbol, we need to copy it and rename it to match
307  * the weak symbol. We also need to add it to the td so it's
308  * handled along with the others later.
309  */
310 static iidesc_t *
311 copy_from_strong(tdata_t *td, GElf_Sym *sym, iidesc_t *strongdesc,
312     const char *weakname, const char *weakfile)
313 {
314         iidesc_t *new = iidesc_dup_rename(strongdesc, weakname, weakfile);
315         uchar_t type = GELF_ST_TYPE(sym->st_info);
316
317         switch (type) {
318         case STT_OBJECT:
319                 new->ii_type = II_GVAR;
320                 break;
321         case STT_FUNC:
322                 new->ii_type = II_GFUN;
323                 break;
324         }
325
326         hash_add(td->td_iihash, new);
327
328         return (new);
329 }
330
331 /*
332  * Process the symbol table of the output file, associating each symbol
333  * with a type description if possible, and sorting them into functions
334  * and data, maintaining symbol table order.
335  */
336 static iiburst_t *
337 sort_iidescs(Elf *elf, const char *file, tdata_t *td, int fuzzymatch,
338     int dynsym)
339 {
340         iiburst_t *iiburst;
341         Elf_Scn *scn;
342         GElf_Shdr shdr;
343         Elf_Data *data, *strdata;
344         int i, stidx;
345         int nent;
346         iidesc_match_t match;
347
348         match.iim_fuzzy = fuzzymatch;
349         match.iim_file = NULL;
350
351         if ((stidx = findelfsecidx(elf, file,
352             dynsym ? ".dynsym" : ".symtab")) < 0)
353                 terminate("%s: Can't open symbol table\n", file);
354         scn = elf_getscn(elf, stidx);
355         data = elf_getdata(scn, NULL);
356         gelf_getshdr(scn, &shdr);
357         nent = shdr.sh_size / shdr.sh_entsize;
358
359         scn = elf_getscn(elf, shdr.sh_link);
360         strdata = elf_getdata(scn, NULL);
361
362         iiburst = iiburst_new(td, nent);
363
364         for (i = 0; i < nent; i++) {
365                 GElf_Sym sym;
366                 char *bname;
367                 iidesc_t **tolist;
368                 GElf_Sym ssym;
369                 iidesc_match_t smatch;
370                 int *curr;
371                 iidesc_t *iidesc;
372
373                 if (gelf_getsym(data, i, &sym) == NULL)
374                         elfterminate(file, "Couldn't read symbol %d", i);
375
376                 match.iim_name = (char *)strdata->d_buf + sym.st_name;
377                 match.iim_bind = GELF_ST_BIND(sym.st_info);
378
379                 switch (GELF_ST_TYPE(sym.st_info)) {
380                 case STT_FILE:
381                         bname = strrchr(match.iim_name, '/');
382                         match.iim_file = bname == NULL ? match.iim_name : bname + 1;
383                         continue;
384                 case STT_OBJECT:
385                         tolist = iiburst->iib_objts;
386                         curr = &iiburst->iib_nobjts;
387                         break;
388                 case STT_FUNC:
389                         tolist = iiburst->iib_funcs;
390                         curr = &iiburst->iib_nfuncs;
391                         break;
392                 default:
393                         continue;
394                 }
395
396                 if (ignore_symbol(&sym, match.iim_name))
397                         continue;
398
399                 iidesc = find_iidesc(td, &match);
400
401                 if (iidesc != NULL) {
402                         tolist[*curr] = iidesc;
403                         iidesc->ii_flags |= IIDESC_F_USED;
404                         (*curr)++;
405                         continue;
406                 }
407
408                 if (!check_for_weak(&sym, match.iim_file, data, nent, strdata,
409                     &ssym, &smatch.iim_file)) {
410                         (*curr)++;
411                         continue;
412                 }
413
414                 smatch.iim_fuzzy = fuzzymatch;
415                 smatch.iim_name = (char *)strdata->d_buf + ssym.st_name;
416                 smatch.iim_bind = GELF_ST_BIND(ssym.st_info);
417
418                 debug(3, "Weak symbol %s resolved to %s\n", match.iim_name,
419                     smatch.iim_name);
420
421                 iidesc = find_iidesc(td, &smatch);
422
423                 if (iidesc != NULL) {
424                         tolist[*curr] = copy_from_strong(td, &sym,
425                             iidesc, match.iim_name, match.iim_file);
426                         tolist[*curr]->ii_flags |= IIDESC_F_USED;
427                 }
428
429                 (*curr)++;
430         }
431
432         /*
433          * Stabs are generated for every function declared in a given C source
434          * file.  When converting an object file, we may encounter a stab that
435          * has no symbol table entry because the optimizer has decided to omit
436          * that item (for example, an unreferenced static function).  We may
437          * see iidescs that do not have an associated symtab entry, and so
438          * we do not write records for those functions into the CTF data.
439          * All others get marked as a root by this function.
440          */
441         iiburst_types(iiburst);
442
443         /*
444          * By not adding some of the functions and/or objects, we may have
445          * caused some types that were referenced solely by those
446          * functions/objects to be suppressed.  This could cause a label,
447          * generated prior to the evisceration, to be incorrect.  Find the
448          * highest type index, and change the label indicies to be no higher
449          * than this value.
450          */
451         tdata_label_newmax(td, iiburst->iib_maxtypeid);
452
453         return (iiburst);
454 }
455
456 static void
457 write_file(Elf *src, const char *srcname, Elf *dst, const char *dstname,
458     caddr_t ctfdata, size_t ctfsize, int flags)
459 {
460         GElf_Ehdr sehdr, dehdr;
461         Elf_Scn *sscn, *dscn;
462         Elf_Data *sdata, *ddata;
463         GElf_Shdr shdr;
464         GElf_Word symtab_type;
465         int symtab_idx = -1;
466         off_t new_offset = 0;
467         off_t ctfnameoff = 0;
468         int dynsym = (flags & CTF_USE_DYNSYM);
469         int keep_stabs = (flags & CTF_KEEP_STABS);
470         int *secxlate;
471         int srcidx, dstidx;
472         int curnmoff = 0;
473         int changing = 0;
474         int pad;
475         int i;
476
477         if (gelf_newehdr(dst, gelf_getclass(src)) == NULL)
478                 elfterminate(dstname, "Cannot copy ehdr to temp file");
479         gelf_getehdr(src, &sehdr);
480         memcpy(&dehdr, &sehdr, sizeof (GElf_Ehdr));
481         gelf_update_ehdr(dst, &dehdr);
482
483         symtab_type = dynsym ? SHT_DYNSYM : SHT_SYMTAB;
484
485         /*
486          * Neither the existing stab sections nor the SUNW_ctf sections (new or
487          * existing) are SHF_ALLOC'd, so they won't be in areas referenced by
488          * program headers.  As such, we can just blindly copy the program
489          * headers from the existing file to the new file.
490          */
491         if (sehdr.e_phnum != 0) {
492                 (void) elf_flagelf(dst, ELF_C_SET, ELF_F_LAYOUT);
493                 if (gelf_newphdr(dst, sehdr.e_phnum) == NULL)
494                         elfterminate(dstname, "Cannot make phdrs in temp file");
495
496                 for (i = 0; i < sehdr.e_phnum; i++) {
497                         GElf_Phdr phdr;
498
499                         gelf_getphdr(src, i, &phdr);
500                         gelf_update_phdr(dst, i, &phdr);
501                 }
502         }
503
504         secxlate = xmalloc(sizeof (int) * sehdr.e_shnum);
505         for (srcidx = dstidx = 0; srcidx < sehdr.e_shnum; srcidx++) {
506                 Elf_Scn *scn = elf_getscn(src, srcidx);
507                 GElf_Shdr shdr1;
508                 char *sname;
509
510                 gelf_getshdr(scn, &shdr1);
511                 sname = elf_strptr(src, sehdr.e_shstrndx, shdr1.sh_name);
512                 if (sname == NULL) {
513                         elfterminate(srcname, "Can't find string at %u",
514                             shdr1.sh_name);
515                 }
516
517                 if (strcmp(sname, CTF_ELF_SCN_NAME) == 0) {
518                         secxlate[srcidx] = -1;
519                 } else if (!keep_stabs &&
520                     (strncmp(sname, ".stab", 5) == 0 ||
521                     strncmp(sname, ".debug", 6) == 0 ||
522                     strncmp(sname, ".rel.debug", 10) == 0 ||
523                     strncmp(sname, ".rela.debug", 11) == 0)) {
524                         secxlate[srcidx] = -1;
525                 } else if (dynsym && shdr1.sh_type == SHT_SYMTAB) {
526                         /*
527                          * If we're building CTF against the dynsym,
528                          * we'll rip out the symtab so debuggers aren't
529                          * confused.
530                          */
531                         secxlate[srcidx] = -1;
532                 } else {
533                         secxlate[srcidx] = dstidx++;
534                         curnmoff += strlen(sname) + 1;
535                 }
536
537                 new_offset = (off_t)dehdr.e_phoff;
538         }
539
540         for (srcidx = 1; srcidx < sehdr.e_shnum; srcidx++) {
541                 char *sname;
542
543                 sscn = elf_getscn(src, srcidx);
544                 gelf_getshdr(sscn, &shdr);
545
546                 if (secxlate[srcidx] == -1) {
547                         changing = 1;
548                         continue;
549                 }
550
551                 dscn = elf_newscn(dst);
552
553                 /*
554                  * If this file has program headers, we need to explicitly lay
555                  * out sections.  If none of the sections prior to this one have
556                  * been removed, then we can just use the existing location.  If
557                  * one or more sections have been changed, then we need to
558                  * adjust this one to avoid holes.
559                  */
560                 if (changing && sehdr.e_phnum != 0) {
561                         pad = new_offset % shdr.sh_addralign;
562
563                         if (pad)
564                                 new_offset += shdr.sh_addralign - pad;
565                         shdr.sh_offset = new_offset;
566                 }
567
568                 shdr.sh_link = secxlate[shdr.sh_link];
569
570                 if (shdr.sh_type == SHT_REL || shdr.sh_type == SHT_RELA)
571                         shdr.sh_info = secxlate[shdr.sh_info];
572
573                 sname = elf_strptr(src, sehdr.e_shstrndx, shdr.sh_name);
574                 if (sname == NULL) {
575                         elfterminate(srcname, "Can't find string at %u",
576                             shdr.sh_name);
577                 }
578
579 #if !defined(sun)
580                 if (gelf_update_shdr(dscn, &shdr) == 0)
581                         elfterminate(dstname, "Cannot update sect %s", sname);
582 #endif
583
584                 if ((sdata = elf_getdata(sscn, NULL)) == NULL)
585                         elfterminate(srcname, "Cannot get sect %s data", sname);
586                 if ((ddata = elf_newdata(dscn)) == NULL)
587                         elfterminate(dstname, "Can't make sect %s data", sname);
588 #if defined(sun)
589                 bcopy(sdata, ddata, sizeof (Elf_Data));
590 #else
591                 /*
592                  * FreeBSD's Elf_Data has private fields which the
593                  * elf_* routines manage. Simply copying the 
594                  * entire structure corrupts the data. So we need
595                  * to copy the public fields explictly.
596                  */
597                 ddata->d_align = sdata->d_align;
598                 ddata->d_off = sdata->d_off;
599                 ddata->d_size = sdata->d_size;
600                 ddata->d_type = sdata->d_type;
601                 ddata->d_version = sdata->d_version;
602 #endif
603
604                 if (srcidx == sehdr.e_shstrndx) {
605                         char seclen = strlen(CTF_ELF_SCN_NAME);
606
607                         ddata->d_buf = xmalloc(ddata->d_size + shdr.sh_size +
608                             seclen + 1);
609                         bcopy(sdata->d_buf, ddata->d_buf, shdr.sh_size);
610                         strcpy((caddr_t)ddata->d_buf + shdr.sh_size,
611                             CTF_ELF_SCN_NAME);
612                         ctfnameoff = (off_t)shdr.sh_size;
613                         shdr.sh_size += seclen + 1;
614                         ddata->d_size += seclen + 1;
615
616                         if (sehdr.e_phnum != 0)
617                                 changing = 1;
618                 }
619
620                 if (shdr.sh_type == symtab_type && shdr.sh_entsize != 0) {
621                         int nsym = shdr.sh_size / shdr.sh_entsize;
622
623                         symtab_idx = secxlate[srcidx];
624
625                         ddata->d_buf = xmalloc(shdr.sh_size);
626                         bcopy(sdata->d_buf, ddata->d_buf, shdr.sh_size);
627
628                         for (i = 0; i < nsym; i++) {
629                                 GElf_Sym sym;
630                                 short newscn;
631
632                                 if (gelf_getsym(ddata, i, &sym) == NULL)
633                                         printf("Could not get symbol %d\n",i);
634
635                                 if (sym.st_shndx >= SHN_LORESERVE)
636                                         continue;
637
638                                 if ((newscn = secxlate[sym.st_shndx]) !=
639                                     sym.st_shndx) {
640                                         sym.st_shndx =
641                                             (newscn == -1 ? 1 : newscn);
642
643                                         gelf_update_sym(ddata, i, &sym);
644                                 }
645                         }
646                 }
647
648 #if !defined(sun)
649                 if (ddata->d_buf == NULL && sdata->d_buf != NULL) {
650                         ddata->d_buf = xmalloc(shdr.sh_size);
651                         bcopy(sdata->d_buf, ddata->d_buf, shdr.sh_size);
652                 }
653 #endif
654
655                 if (gelf_update_shdr(dscn, &shdr) == 0)
656                         elfterminate(dstname, "Cannot update sect %s", sname);
657
658                 new_offset = (off_t)shdr.sh_offset;
659                 if (shdr.sh_type != SHT_NOBITS)
660                         new_offset += shdr.sh_size;
661         }
662
663         if (symtab_idx == -1) {
664                 terminate("%s: Cannot find %s section\n", srcname,
665                     dynsym ? "SHT_DYNSYM" : "SHT_SYMTAB");
666         }
667
668         /* Add the ctf section */
669         dscn = elf_newscn(dst);
670         gelf_getshdr(dscn, &shdr);
671         shdr.sh_name = ctfnameoff;
672         shdr.sh_type = SHT_PROGBITS;
673         shdr.sh_size = ctfsize;
674         shdr.sh_link = symtab_idx;
675         shdr.sh_addralign = 4;
676         if (changing && sehdr.e_phnum != 0) {
677                 pad = new_offset % shdr.sh_addralign;
678
679                 if (pad)
680                         new_offset += shdr.sh_addralign - pad;
681
682                 shdr.sh_offset = new_offset;
683                 new_offset += shdr.sh_size;
684         }
685
686         ddata = elf_newdata(dscn);
687         ddata->d_buf = ctfdata;
688         ddata->d_size = ctfsize;
689         ddata->d_align = shdr.sh_addralign;
690         ddata->d_off = 0;
691
692         gelf_update_shdr(dscn, &shdr);
693
694         /* update the section header location */
695         if (sehdr.e_phnum != 0) {
696                 size_t align = gelf_fsize(dst, ELF_T_ADDR, 1, EV_CURRENT);
697                 size_t r = new_offset % align;
698
699                 if (r)
700                         new_offset += align - r;
701
702                 dehdr.e_shoff = new_offset;
703         }
704
705         /* commit to disk */
706         dehdr.e_shstrndx = secxlate[sehdr.e_shstrndx];
707         gelf_update_ehdr(dst, &dehdr);
708         if (elf_update(dst, ELF_C_WRITE) < 0)
709                 elfterminate(dstname, "Cannot finalize temp file");
710
711         free(secxlate);
712 }
713
714 static caddr_t
715 make_ctf_data(tdata_t *td, Elf *elf, const char *file, size_t *lenp, int flags)
716 {
717         iiburst_t *iiburst;
718         caddr_t data;
719
720         iiburst = sort_iidescs(elf, file, td, flags & CTF_FUZZY_MATCH,
721             flags & CTF_USE_DYNSYM);
722         data = ctf_gen(iiburst, lenp, flags & CTF_COMPRESS);
723
724         iiburst_free(iiburst);
725
726         return (data);
727 }
728
729 void
730 write_ctf(tdata_t *td, const char *curname, const char *newname, int flags)
731 {
732         struct stat st;
733         Elf *elf = NULL;
734         Elf *telf = NULL;
735         caddr_t data;
736         size_t len;
737         int fd = -1;
738         int tfd = -1;
739
740         (void) elf_version(EV_CURRENT);
741         if ((fd = open(curname, O_RDONLY)) < 0 || fstat(fd, &st) < 0)
742                 terminate("%s: Cannot open for re-reading", curname);
743         if ((elf = elf_begin(fd, ELF_C_READ, NULL)) == NULL)
744                 elfterminate(curname, "Cannot re-read");
745
746         if ((tfd = open(newname, O_RDWR | O_CREAT | O_TRUNC, st.st_mode)) < 0)
747                 terminate("Cannot open temp file %s for writing", newname);
748         if ((telf = elf_begin(tfd, ELF_C_WRITE, NULL)) == NULL)
749                 elfterminate(curname, "Cannot write");
750
751         data = make_ctf_data(td, elf, curname, &len, flags);
752         write_file(elf, curname, telf, newname, data, len, flags);
753         free(data);
754
755         elf_end(telf);
756         elf_end(elf);
757         (void) close(fd);
758         (void) close(tfd);
759 }