1 /* IBM RS/6000 "XCOFF" back-end for BFD.
2 Copyright (C) 1990-2018 Free Software Foundation, Inc.
3 Written by Metin G. Ozisik, Mimi Phuong-Thao Vo, and John Gilmore.
4 Archive support from Damon A. Permezel.
5 Contributed by IBM Corporation and Cygnus Support.
7 This file is part of BFD, the Binary File Descriptor library.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
25 /* This port currently only handles reading object files, except when
26 compiled on an RS/6000 host. -- no archive support, no core files.
27 In all cases, it does not support writing.
29 This is in a separate file from coff-rs6000.c, because it includes
30 system include files that conflict with coff/rs6000.h. */
32 /* Internalcoff.h and coffcode.h modify themselves based on this flag. */
33 #define RS6000COFF_C 1
35 /* The AIX 4.1 kernel is obviously compiled with -D_LONG_LONG, so
36 we have to define _LONG_LONG for older versions of gcc to get the
37 proper alignments in the user structure. */
38 #if defined(_AIX41) && !defined(_LONG_LONG)
48 /* AOUTHDR is defined by the above. We need another defn of it, from the
49 system include files. Punt the old one and get us a new name for the
50 typedef in the system include files. */
54 #define AOUTHDR second_AOUTHDR
58 /* Support for core file stuff. */
61 #define __LDINFO_PTRACE32__ /* for __ld_info32 */
62 #define __LDINFO_PTRACE64__ /* for __ld_info64 */
65 #include <sys/systemcfg.h>
67 /* Borrowed from <sys/inttypes.h> on recent AIX versions. */
68 typedef unsigned long ptr_to_uint;
70 #define core_hdr(bfd) ((CoreHdr *) bfd->tdata.any)
72 /* AIX 4.1 changed the names and locations of a few items in the core file.
73 AIX 4.3 defined an entirely new structure, core_dumpx, but kept support for
74 the previous 4.1 structure, core_dump.
76 AIX_CORE_DUMPX_CORE is defined (by configure) on AIX 4.3+, and
77 CORE_VERSION_1 is defined (by AIX core.h) as 2 on AIX 4.3+ and as 1 on AIX
78 4.1 and 4.2. AIX pre-4.1 (aka 3.x) either doesn't define CORE_VERSION_1
79 or else defines it as 0. */
81 #if defined(CORE_VERSION_1) && !CORE_VERSION_1
82 # undef CORE_VERSION_1
85 /* The following union and macros allow this module to compile on all AIX
86 versions and to handle both core_dumpx and core_dump on 4.3+. CNEW_*()
87 and COLD_*() macros respectively retrieve core_dumpx and core_dump
90 /* Union of 32-bit and 64-bit versions of ld_info. */
94 #if defined (__ld_info32) || defined (__ld_info64)
95 struct __ld_info32 l32;
96 struct __ld_info64 l64;
103 /* Union of old and new core dump structures. */
107 #ifdef AIX_CORE_DUMPX_CORE
108 struct core_dumpx new_dump; /* New AIX 4.3+ core dump. */
110 struct core_dump new_dump; /* For simpler coding. */
112 #ifndef BFD64 /* Use old only if gdb is 32-bit. */
113 struct core_dump old; /* Old AIX 4.2- core dump, still used on
114 4.3+ with appropriate SMIT config. */
118 /* Union of old and new vm_info structures. */
120 #ifdef CORE_VERSION_1
123 #ifdef AIX_CORE_DUMPX_CORE
124 struct vm_infox new_dump;
126 struct vm_info new_dump;
134 /* Return whether CoreHdr C is in new or old format. */
136 #ifdef AIX_CORE_DUMPX_CORE
138 # define CORE_NEW(c) (!(c).old.c_entries)
140 # define CORE_NEW(c) 1
143 # define CORE_NEW(c) 0
146 /* Return whether CoreHdr C usese core_dumpxx structure.
148 FIXME: the core file format version number used here definitely indicates
149 that struct core_dumpxx should be used to represent the core file header,
150 but that may not be the only such format version number. */
153 # define CORE_DUMPXX_VERSION 267312562
154 # define CNEW_IS_CORE_DUMPXX(c) ((c).new_dump.c_version == CORE_DUMPXX_VERSION)
156 # define CNEW_IS_CORE_DUMPXX(c) 0
159 /* Return the c_stackorg field from struct core_dumpx C. */
161 #ifdef AIX_CORE_DUMPX_CORE
162 # define CNEW_STACKORG(c) (c).c_stackorg
164 # define CNEW_STACKORG(c) 0
167 /* Return the offset to the loader region from struct core_dump C. */
169 #ifdef AIX_CORE_DUMPX_CORE
170 # define CNEW_LOADER(c) (c).c_loader
172 # define CNEW_LOADER(c) 0
175 /* Return the offset to the loader region from struct core_dump C. */
177 #define COLD_LOADER(c) (c).c_tab
179 /* Return the c_lsize field from struct core_dumpx C. */
181 #ifdef AIX_CORE_DUMPX_CORE
182 # define CNEW_LSIZE(c) (c).c_lsize
184 # define CNEW_LSIZE(c) 0
187 /* Return the c_dataorg field from struct core_dumpx C. */
189 #ifdef AIX_CORE_DUMPX_CORE
190 # define CNEW_DATAORG(c) (c).c_dataorg
192 # define CNEW_DATAORG(c) 0
195 /* Return the c_datasize field from struct core_dumpx C. */
197 #ifdef AIX_CORE_DUMPX_CORE
198 # define CNEW_DATASIZE(c) (c).c_datasize
200 # define CNEW_DATASIZE(c) 0
203 /* Return the c_impl field from struct core_dumpx C. */
205 #if defined (HAVE_ST_C_IMPL) || defined (AIX_5_CORE)
206 # define CNEW_IMPL(c) (c).c_impl
208 # define CNEW_IMPL(c) 0
211 /* Return the command string from struct core_dumpx C. */
213 #ifdef AIX_CORE_DUMPX_CORE
214 # define CNEW_COMM(c) (c).c_u.U_proc.pi_comm
216 # define CNEW_COMM(c) 0
219 /* Return the command string from struct core_dump C. */
221 #ifdef CORE_VERSION_1
222 # define COLD_COMM(c) (c).c_u.U_comm
224 # define COLD_COMM(c) (c).c_u.u_comm
227 /* Return the struct __context64 pointer from struct core_dumpx C. */
229 #ifdef AIX_CORE_DUMPX_CORE
230 # define CNEW_CONTEXT64(c) (c).c_flt.hctx.r64
232 # define CNEW_CONTEXT64(c) c
235 /* Return the struct mstsave pointer from struct core_dumpx C. */
237 #ifdef AIX_CORE_DUMPX_CORE
238 # define CNEW_MSTSAVE(c) (c).c_flt.hctx.r32
240 # define CNEW_MSTSAVE(c) c
243 /* Return the struct mstsave pointer from struct core_dump C. */
245 #ifdef CORE_VERSION_1
246 # define COLD_MSTSAVE(c) (c).c_mst
248 # define COLD_MSTSAVE(c) (c).c_u.u_save
251 /* Return whether struct core_dumpx is from a 64-bit process. */
253 #ifdef AIX_CORE_DUMPX_CORE
254 # define CNEW_PROC64(c) IS_PROC64(&(c).c_u.U_proc)
256 # define CNEW_PROC64(c) 0
259 /* Magic end-of-stack addresses for old core dumps. This is _very_ fragile,
260 but I don't see any easy way to get that info right now. */
262 #ifdef CORE_VERSION_1
263 # define COLD_STACKEND 0x2ff23000
265 # define COLD_STACKEND 0x2ff80000
268 /* Size of the leading portion that old and new core dump structures have in
270 #ifdef AIX_CORE_DUMPX_CORE
271 #define CORE_COMMONSZ ((long) &((struct core_dumpx *) 0)->c_entries \
272 + sizeof (((struct core_dumpx *) 0)->c_entries))
274 #define CORE_COMMONSZ ((int) &((struct core_dump *) 0)->c_entries \
275 + sizeof (((struct core_dump *) 0)->c_entries))
277 /* Define prototypes for certain functions, to avoid a compiler warning
278 saying that they are missing. */
280 const bfd_target * rs6000coff_core_p (bfd *abfd);
281 bfd_boolean rs6000coff_core_file_matches_executable_p (bfd *core_bfd,
283 char * rs6000coff_core_file_failing_command (bfd *abfd);
284 int rs6000coff_core_file_failing_signal (bfd *abfd);
286 /* Try to read into CORE the header from the core file associated with ABFD.
290 read_hdr (bfd *abfd, CoreHdr *core)
294 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
297 /* Read the leading portion that old and new core dump structures have in
299 size = CORE_COMMONSZ;
300 if (bfd_bread (core, size, abfd) != size)
303 /* Read the trailing portion of the structure. */
304 if (CORE_NEW (*core))
305 size = sizeof (core->new_dump);
308 size = sizeof (core->old);
310 size -= CORE_COMMONSZ;
311 return bfd_bread ((char *) core + CORE_COMMONSZ, size, abfd) == size;
315 make_bfd_asection (bfd *abfd, const char *name, flagword flags,
316 bfd_size_type size, bfd_vma vma, file_ptr filepos)
320 asect = bfd_make_section_anyway_with_flags (abfd, name, flags);
326 asect->filepos = filepos;
327 asect->alignment_power = 8;
332 /* Decide if a given bfd represents a `core' file or not. There really is no
333 magic number or anything like, in rs6000coff. */
336 rs6000coff_core_p (bfd *abfd)
343 /* Values from new and old core structures. */
345 file_ptr c_stack, c_regoff, c_loader;
346 bfd_size_type c_size, c_regsize, c_lsize;
351 if (!read_hdr (abfd, &core))
353 if (bfd_get_error () != bfd_error_system_call)
354 bfd_set_error (bfd_error_wrong_format);
358 /* This isn't the right handler for 64-bit core files on AIX 5.x. */
359 if (CORE_NEW (core) && CNEW_IS_CORE_DUMPXX (core))
361 bfd_set_error (bfd_error_wrong_format);
365 /* Copy fields from new or old core structure. */
368 c_flag = core.new_dump.c_flag;
369 c_stack = (file_ptr) core.new_dump.c_stack;
370 c_size = core.new_dump.c_size;
371 c_stackend = CNEW_STACKORG (core.new_dump) + c_size;
372 c_lsize = CNEW_LSIZE (core.new_dump);
373 c_loader = CNEW_LOADER (core.new_dump);
375 proc64 = CNEW_PROC64 (core.new_dump);
379 c_flag = core.old.c_flag;
380 c_stack = (file_ptr) (ptr_to_uint) core.old.c_stack;
381 c_size = core.old.c_size;
382 c_stackend = COLD_STACKEND;
384 c_loader = (file_ptr) (ptr_to_uint) COLD_LOADER (core.old);
391 c_regsize = sizeof (CNEW_CONTEXT64 (core.new_dump));
392 c_regptr = &CNEW_CONTEXT64 (core.new_dump);
394 else if (CORE_NEW (core))
396 c_regsize = sizeof (CNEW_MSTSAVE (core.new_dump));
397 c_regptr = &CNEW_MSTSAVE (core.new_dump);
402 c_regsize = sizeof (COLD_MSTSAVE (core.old));
403 c_regptr = &COLD_MSTSAVE (core.old);
406 c_regoff = (char *) c_regptr - (char *) &core;
408 if (bfd_stat (abfd, &statbuf) < 0)
410 bfd_set_error (bfd_error_system_call);
414 /* If the core file ulimit is too small, the system will first
415 omit the data segment, then omit the stack, then decline to
416 dump core altogether (as far as I know UBLOCK_VALID and LE_VALID
417 are always set) (this is based on experimentation on AIX 3.2).
418 Now, the thing is that GDB users will be surprised
419 if segments just silently don't appear (well, maybe they would
420 think to check "info files", I don't know).
422 For the data segment, we have no choice but to keep going if it's
423 not there, since the default behavior is not to dump it (regardless
424 of the ulimit, it's based on SA_FULLDUMP). But for the stack segment,
425 if it's not there, we refuse to have anything to do with this core
426 file. The usefulness of a core dump without a stack segment is pretty
429 if (!(c_flag & UBLOCK_VALID)
430 || !(c_flag & LE_VALID))
432 bfd_set_error (bfd_error_wrong_format);
436 if (!(c_flag & USTACK_VALID))
438 bfd_set_error (bfd_error_file_truncated);
442 /* Don't check the core file size for a full core, AIX 4.1 includes
443 additional shared library sections in a full core. */
444 if (!(c_flag & (FULL_CORE | CORE_TRUNC)))
446 /* If the size is wrong, it means we're misinterpreting something. */
447 if (c_stack + (file_ptr) c_size != statbuf.st_size)
449 bfd_set_error (bfd_error_wrong_format);
454 /* Sanity check on the c_tab field. */
458 c_loader < (file_ptr) sizeof core.old
460 c_loader < (file_ptr) sizeof core.new_dump
462 || c_loader >= statbuf.st_size
463 || c_loader >= c_stack))
465 bfd_set_error (bfd_error_wrong_format);
469 /* Issue warning if the core file was truncated during writing. */
470 if (c_flag & CORE_TRUNC)
471 _bfd_error_handler (_("%pB: warning core file truncated"), abfd);
473 /* Allocate core file header. */
475 size = CORE_NEW (core) ? sizeof (core.new_dump) : sizeof (core.old);
477 size = sizeof (core.new_dump);
479 tmpptr = (char *) bfd_zalloc (abfd, (bfd_size_type) size);
483 /* Copy core file header. */
484 memcpy (tmpptr, &core, size);
485 set_tdata (abfd, tmpptr);
487 /* Set architecture. */
490 enum bfd_architecture arch;
493 switch (CNEW_IMPL (core.new_dump))
498 arch = bfd_arch_rs6000;
499 mach = bfd_mach_rs6k;
502 arch = bfd_arch_powerpc;
506 bfd_default_set_arch_mach (abfd, arch, mach);
509 /* .stack section. */
510 if (!make_bfd_asection (abfd, ".stack",
511 SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
512 c_size, c_stackend - c_size, c_stack))
515 /* .reg section for all registers. */
516 if (!make_bfd_asection (abfd, ".reg",
518 c_regsize, (bfd_vma) 0, c_regoff))
522 To actually find out how long this section is in this particular
523 core dump would require going down the whole list of struct ld_info's.
524 See if we can just fake it. */
525 if (!make_bfd_asection (abfd, ".ldinfo",
527 c_lsize, (bfd_vma) 0, c_loader))
530 #ifndef CORE_VERSION_1
531 /* .data section if present.
532 AIX 3 dumps the complete data section and sets FULL_CORE if the
533 ulimit is large enough, otherwise the data section is omitted.
534 AIX 4 sets FULL_CORE even if the core file is truncated, we have
535 to examine core.c_datasize below to find out the actual size of
536 the .data section. */
537 if (c_flag & FULL_CORE)
539 if (!make_bfd_asection (abfd, ".data",
540 SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
541 (bfd_size_type) core.old.c_u.u_dsize,
543 CDATA_ADDR (core.old.c_u.u_dsize),
549 #ifdef CORE_VERSION_1
550 /* AIX 4 adds data sections from loaded objects to the core file,
551 which can be found by examining ldinfo, and anonymously mmapped
555 bfd_size_type ldi_datasize;
559 bfd_vma core_dataorg;
561 /* Fields from new and old core structures. */
562 bfd_size_type c_datasize, c_vmregions;
563 file_ptr c_data, c_vmm;
567 c_datasize = CNEW_DATASIZE (core.new_dump);
568 c_data = (file_ptr) core.new_dump.c_data;
569 c_vmregions = core.new_dump.c_vmregions;
570 c_vmm = (file_ptr) core.new_dump.c_vmm;
575 c_datasize = core.old.c_datasize;
576 c_data = (file_ptr) (ptr_to_uint) core.old.c_data;
577 c_vmregions = core.old.c_vmregions;
578 c_vmm = (file_ptr) (ptr_to_uint) core.old.c_vmm;
582 /* .data section from executable. */
585 /* If Large Memory Model is used, then the .data segment should start from
586 BDATAORG which has been defined in the system header files. */
588 if (c_flag & CORE_BIGDATA)
589 core_dataorg = BDATAORG;
591 core_dataorg = CDATA_ADDR (c_datasize);
593 if (!make_bfd_asection (abfd, ".data",
594 SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
596 (bfd_vma) core_dataorg,
601 /* .data sections from loaded objects. */
603 size = (unsigned long) ((LdInfo *) 0)->l64.ldinfo_filename;
605 size = (unsigned long) ((LdInfo *) 0)->l32.ldinfo_filename;
609 if (bfd_seek (abfd, c_loader, SEEK_SET) != 0)
611 if (bfd_bread (&ldinfo, size, abfd) != size)
616 ldi_core = ldinfo.l64.ldinfo_core;
617 ldi_datasize = ldinfo.l64.ldinfo_datasize;
618 ldi_dataorg = (bfd_vma) ldinfo.l64.ldinfo_dataorg;
619 ldi_next = ldinfo.l64.ldinfo_next;
623 ldi_core = ldinfo.l32.ldinfo_core;
624 ldi_datasize = ldinfo.l32.ldinfo_datasize;
625 ldi_dataorg = (bfd_vma) (ptr_to_uint) ldinfo.l32.ldinfo_dataorg;
626 ldi_next = ldinfo.l32.ldinfo_next;
630 if (!make_bfd_asection (abfd, ".data",
631 SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
632 ldi_datasize, ldi_dataorg, ldi_core))
637 c_loader += ldi_next;
640 /* .vmdata sections from anonymously mmapped regions. */
645 if (bfd_seek (abfd, c_vmm, SEEK_SET) != 0)
648 for (i = 0; i < c_vmregions; i++)
651 bfd_size_type vminfo_size;
652 file_ptr vminfo_offset;
656 size = CORE_NEW (core) ? sizeof (vminfo.new_dump) : sizeof (vminfo.old);
658 size = sizeof (vminfo.new_dump);
660 if (bfd_bread (&vminfo, size, abfd) != size)
665 vminfo_addr = (bfd_vma) vminfo.new_dump.vminfo_addr;
666 vminfo_size = vminfo.new_dump.vminfo_size;
667 vminfo_offset = vminfo.new_dump.vminfo_offset;
672 vminfo_addr = (bfd_vma) (ptr_to_uint) vminfo.old.vminfo_addr;
673 vminfo_size = vminfo.old.vminfo_size;
674 vminfo_offset = vminfo.old.vminfo_offset;
679 if (!make_bfd_asection (abfd, ".vmdata",
680 SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
681 vminfo_size, vminfo_addr,
689 return abfd->xvec; /* This is garbage for now. */
692 bfd_release (abfd, abfd->tdata.any);
693 abfd->tdata.any = NULL;
694 bfd_section_list_clear (abfd);
698 /* Return `TRUE' if given core is from the given executable. */
701 rs6000coff_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd)
707 const char *str1, *str2;
711 if (!read_hdr (core_bfd, &core))
715 c_loader = CNEW_LOADER (core.new_dump);
718 c_loader = (file_ptr) (ptr_to_uint) COLD_LOADER (core.old);
721 if (CORE_NEW (core) && CNEW_PROC64 (core.new_dump))
722 size = (int) ((LdInfo *) 0)->l64.ldinfo_filename;
724 size = (int) ((LdInfo *) 0)->l32.ldinfo_filename;
726 if (bfd_seek (core_bfd, c_loader + size, SEEK_SET) != 0)
730 path = bfd_malloc ((bfd_size_type) alloc);
737 if (bfd_bread (s, (bfd_size_type) 1, core_bfd) != 1)
745 if (s == path + alloc)
750 n = bfd_realloc (path, (bfd_size_type) alloc);
761 str1 = strrchr (path, '/');
762 str2 = strrchr (exec_bfd->filename, '/');
764 /* step over character '/' */
765 str1 = str1 != NULL ? str1 + 1 : path;
766 str2 = str2 != NULL ? str2 + 1 : exec_bfd->filename;
768 if (strcmp (str1, str2) == 0)
779 rs6000coff_core_file_failing_command (bfd *abfd)
781 CoreHdr *core = core_hdr (abfd);
783 char *com = CORE_NEW (*core) ?
784 CNEW_COMM (core->new_dump) : COLD_COMM (core->old);
786 char *com = CNEW_COMM (core->new_dump);
796 rs6000coff_core_file_failing_signal (bfd *abfd)
798 CoreHdr *core = core_hdr (abfd);
800 return CORE_NEW (*core) ? core->new_dump.c_signo : core->old.c_signo;
802 return core->new_dump.c_signo;
806 #endif /* AIX_CORE */