1 /* IBM RS/6000 "XCOFF" back-end for BFD.
2 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2000,
3 2001, 2002, 2004, 2006, 2007, 2008
4 Free Software Foundation, Inc.
5 Written by Metin G. Ozisik, Mimi Phuong-Thao Vo, and John Gilmore.
6 Archive support from Damon A. Permezel.
7 Contributed by IBM Corporation and Cygnus Support.
9 This file is part of BFD, the Binary File Descriptor library.
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program; if not, write to the Free Software
23 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
24 MA 02110-1301, USA. */
27 /* This port currently only handles reading object files, except when
28 compiled on an RS/6000 host. -- no archive support, no core files.
29 In all cases, it does not support writing.
31 This is in a separate file from coff-rs6000.c, because it includes
32 system include files that conflict with coff/rs6000.h. */
34 /* Internalcoff.h and coffcode.h modify themselves based on this flag. */
35 #define RS6000COFF_C 1
37 /* The AIX 4.1 kernel is obviously compiled with -D_LONG_LONG, so
38 we have to define _LONG_LONG for older versions of gcc to get the
39 proper alignments in the user structure. */
40 #if defined(_AIX41) && !defined(_LONG_LONG)
50 /* AOUTHDR is defined by the above. We need another defn of it, from the
51 system include files. Punt the old one and get us a new name for the
52 typedef in the system include files. */
56 #define AOUTHDR second_AOUTHDR
60 /* ------------------------------------------------------------------------ */
61 /* Support for core file stuff.. */
62 /* ------------------------------------------------------------------------ */
65 #define __LDINFO_PTRACE32__ /* for __ld_info32 */
66 #define __LDINFO_PTRACE64__ /* for __ld_info64 */
69 #include <sys/systemcfg.h>
71 /* Borrowed from <sys/inttypes.h> on recent AIX versions. */
72 typedef unsigned long ptr_to_uint;
74 #define core_hdr(bfd) ((CoreHdr *) bfd->tdata.any)
76 /* AIX 4.1 changed the names and locations of a few items in the core file.
77 AIX 4.3 defined an entirely new structure, core_dumpx, but kept support for
78 the previous 4.1 structure, core_dump.
80 AIX_CORE_DUMPX_CORE is defined (by configure) on AIX 4.3+, and
81 CORE_VERSION_1 is defined (by AIX core.h) as 2 on AIX 4.3+ and as 1 on AIX
82 4.1 and 4.2. AIX pre-4.1 (aka 3.x) either doesn't define CORE_VERSION_1
83 or else defines it as 0. */
85 #if defined(CORE_VERSION_1) && !CORE_VERSION_1
86 # undef CORE_VERSION_1
89 /* The following union and macros allow this module to compile on all AIX
90 versions and to handle both core_dumpx and core_dump on 4.3+. CNEW_*()
91 and COLD_*() macros respectively retrieve core_dumpx and core_dump
94 /* Union of 32-bit and 64-bit versions of ld_info. */
98 struct __ld_info32 l32;
99 struct __ld_info64 l64;
106 /* Union of old and new core dump structures. */
109 #ifdef AIX_CORE_DUMPX_CORE
110 struct core_dumpx new; /* new AIX 4.3+ core dump */
112 struct core_dump new; /* for simpler coding */
114 struct core_dump old; /* old AIX 4.2- core dump, still used on
115 4.3+ with appropriate SMIT config */
118 /* Union of old and new vm_info structures. */
120 #ifdef CORE_VERSION_1
122 #ifdef AIX_CORE_DUMPX_CORE
131 /* Return whether CoreHdr C is in new or old format. */
133 #ifdef AIX_CORE_DUMPX_CORE
134 # define CORE_NEW(c) (!(c).old.c_entries)
136 # define CORE_NEW(c) 0
139 /* Return whether CoreHdr C usese core_dumpxx structure.
141 FIXME: the core file format version number used here definitely indicates
142 that struct core_dumpxx should be used to represent the core file header,
143 but that may not be the only such format version number. */
146 # define CORE_DUMPXX_VERSION 267312562
147 # define CNEW_IS_CORE_DUMPXX(c) ((c).new.c_version == CORE_DUMPXX_VERSION)
149 # define CNEW_IS_CORE_DUMPXX(c) 0
152 /* Return the c_stackorg field from struct core_dumpx C. */
154 #ifdef AIX_CORE_DUMPX_CORE
155 # define CNEW_STACKORG(c) (c).c_stackorg
157 # define CNEW_STACKORG(c) 0
160 /* Return the offset to the loader region from struct core_dump C. */
162 #ifdef AIX_CORE_DUMPX_CORE
163 # define CNEW_LOADER(c) (c).c_loader
165 # define CNEW_LOADER(c) 0
168 /* Return the offset to the loader region from struct core_dump C. */
170 #define COLD_LOADER(c) (c).c_tab
172 /* Return the c_lsize field from struct core_dumpx C. */
174 #ifdef AIX_CORE_DUMPX_CORE
175 # define CNEW_LSIZE(c) (c).c_lsize
177 # define CNEW_LSIZE(c) 0
180 /* Return the c_dataorg field from struct core_dumpx C. */
182 #ifdef AIX_CORE_DUMPX_CORE
183 # define CNEW_DATAORG(c) (c).c_dataorg
185 # define CNEW_DATAORG(c) 0
188 /* Return the c_datasize field from struct core_dumpx C. */
190 #ifdef AIX_CORE_DUMPX_CORE
191 # define CNEW_DATASIZE(c) (c).c_datasize
193 # define CNEW_DATASIZE(c) 0
196 /* Return the c_impl field from struct core_dumpx C. */
198 #if defined (HAVE_ST_C_IMPL) || defined (AIX_5_CORE)
199 # define CNEW_IMPL(c) (c).c_impl
201 # define CNEW_IMPL(c) 0
204 /* Return the command string from struct core_dumpx C. */
206 #ifdef AIX_CORE_DUMPX_CORE
207 # define CNEW_COMM(c) (c).c_u.U_proc.pi_comm
209 # define CNEW_COMM(c) 0
212 /* Return the command string from struct core_dump C. */
214 #ifdef CORE_VERSION_1
215 # define COLD_COMM(c) (c).c_u.U_comm
217 # define COLD_COMM(c) (c).c_u.u_comm
220 /* Return the struct __context64 pointer from struct core_dumpx C. */
222 #ifdef AIX_CORE_DUMPX_CORE
223 # define CNEW_CONTEXT64(c) (c).c_flt.hctx.r64
225 # define CNEW_CONTEXT64(c) c
228 /* Return the struct mstsave pointer from struct core_dumpx C. */
230 #ifdef AIX_CORE_DUMPX_CORE
231 # define CNEW_MSTSAVE(c) (c).c_flt.hctx.r32
233 # define CNEW_MSTSAVE(c) c
236 /* Return the struct mstsave pointer from struct core_dump C. */
238 #ifdef CORE_VERSION_1
239 # define COLD_MSTSAVE(c) (c).c_mst
241 # define COLD_MSTSAVE(c) (c).c_u.u_save
244 /* Return whether struct core_dumpx is from a 64-bit process. */
246 #ifdef AIX_CORE_DUMPX_CORE
247 # define CNEW_PROC64(c) IS_PROC64(&(c).c_u.U_proc)
249 # define CNEW_PROC64(c) 0
252 /* Magic end-of-stack addresses for old core dumps. This is _very_ fragile,
253 but I don't see any easy way to get that info right now. */
255 #ifdef CORE_VERSION_1
256 # define COLD_STACKEND 0x2ff23000
258 # define COLD_STACKEND 0x2ff80000
261 /* Size of the leading portion that old and new core dump structures have in
263 #define CORE_COMMONSZ ((int) &((struct core_dump *) 0)->c_entries \
264 + sizeof (((struct core_dump *) 0)->c_entries))
266 /* Define prototypes for certain functions, to avoid a compiler warning
267 saying that they are missing. */
269 const bfd_target * rs6000coff_core_p (bfd *abfd);
270 bfd_boolean rs6000coff_core_file_matches_executable_p (bfd *core_bfd,
272 char * rs6000coff_core_file_failing_command (bfd *abfd);
273 int rs6000coff_core_file_failing_signal (bfd *abfd);
275 /* Try to read into CORE the header from the core file associated with ABFD.
279 read_hdr (bfd *abfd, CoreHdr *core)
283 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
286 /* Read the leading portion that old and new core dump structures have in
288 size = CORE_COMMONSZ;
289 if (bfd_bread (core, size, abfd) != size)
292 /* Read the trailing portion of the structure. */
293 if (CORE_NEW (*core))
294 size = sizeof (core->new);
296 size = sizeof (core->old);
297 size -= CORE_COMMONSZ;
298 return bfd_bread ((char *) core + CORE_COMMONSZ, size, abfd) == size;
302 make_bfd_asection (bfd *abfd, const char *name, flagword flags,
303 bfd_size_type size, bfd_vma vma, file_ptr filepos)
307 asect = bfd_make_section_anyway_with_flags (abfd, name, flags);
313 asect->filepos = filepos;
314 asect->alignment_power = 8;
319 /* Decide if a given bfd represents a `core' file or not. There really is no
320 magic number or anything like, in rs6000coff. */
323 rs6000coff_core_p (bfd *abfd)
330 /* Values from new and old core structures. */
332 file_ptr c_stack, c_regoff, c_loader;
333 bfd_size_type c_size, c_regsize, c_lsize;
338 if (!read_hdr (abfd, &core))
340 if (bfd_get_error () != bfd_error_system_call)
341 bfd_set_error (bfd_error_wrong_format);
345 /* This isn't the right handler for 64-bit core files on AIX 5.x. */
346 if (CORE_NEW (core) && CNEW_IS_CORE_DUMPXX (core))
348 bfd_set_error (bfd_error_wrong_format);
352 /* Copy fields from new or old core structure. */
355 c_flag = core.new.c_flag;
356 c_stack = (file_ptr) core.new.c_stack;
357 c_size = core.new.c_size;
358 c_stackend = CNEW_STACKORG (core.new) + c_size;
359 c_lsize = CNEW_LSIZE (core.new);
360 c_loader = CNEW_LOADER (core.new);
361 proc64 = CNEW_PROC64 (core.new);
365 c_flag = core.old.c_flag;
366 c_stack = (file_ptr) (ptr_to_uint) core.old.c_stack;
367 c_size = core.old.c_size;
368 c_stackend = COLD_STACKEND;
370 c_loader = (file_ptr) (ptr_to_uint) COLD_LOADER (core.old);
376 c_regsize = sizeof (CNEW_CONTEXT64 (core.new));
377 c_regptr = &CNEW_CONTEXT64 (core.new);
379 else if (CORE_NEW (core))
381 c_regsize = sizeof (CNEW_MSTSAVE (core.new));
382 c_regptr = &CNEW_MSTSAVE (core.new);
386 c_regsize = sizeof (COLD_MSTSAVE (core.old));
387 c_regptr = &COLD_MSTSAVE (core.old);
389 c_regoff = (char *) c_regptr - (char *) &core;
391 if (bfd_stat (abfd, &statbuf) < 0)
393 bfd_set_error (bfd_error_system_call);
397 /* If the core file ulimit is too small, the system will first
398 omit the data segment, then omit the stack, then decline to
399 dump core altogether (as far as I know UBLOCK_VALID and LE_VALID
400 are always set) (this is based on experimentation on AIX 3.2).
401 Now, the thing is that GDB users will be surprised
402 if segments just silently don't appear (well, maybe they would
403 think to check "info files", I don't know).
405 For the data segment, we have no choice but to keep going if it's
406 not there, since the default behavior is not to dump it (regardless
407 of the ulimit, it's based on SA_FULLDUMP). But for the stack segment,
408 if it's not there, we refuse to have anything to do with this core
409 file. The usefulness of a core dump without a stack segment is pretty
412 if (!(c_flag & UBLOCK_VALID)
413 || !(c_flag & LE_VALID))
415 bfd_set_error (bfd_error_wrong_format);
419 if (!(c_flag & USTACK_VALID))
421 bfd_set_error (bfd_error_file_truncated);
425 /* Don't check the core file size for a full core, AIX 4.1 includes
426 additional shared library sections in a full core. */
427 if (!(c_flag & (FULL_CORE | CORE_TRUNC)))
429 /* If the size is wrong, it means we're misinterpreting something. */
430 if (c_stack + (file_ptr) c_size != statbuf.st_size)
432 bfd_set_error (bfd_error_wrong_format);
437 /* Sanity check on the c_tab field. */
438 if (!CORE_NEW (core) && (c_loader < (file_ptr) sizeof core.old ||
439 c_loader >= statbuf.st_size ||
440 c_loader >= c_stack))
442 bfd_set_error (bfd_error_wrong_format);
446 /* Issue warning if the core file was truncated during writing. */
447 if (c_flag & CORE_TRUNC)
448 (*_bfd_error_handler) (_("%s: warning core file truncated"),
449 bfd_get_filename (abfd));
451 /* Allocate core file header. */
452 size = CORE_NEW (core) ? sizeof (core.new) : sizeof (core.old);
453 tmpptr = (char *) bfd_zalloc (abfd, (bfd_size_type) size);
457 /* Copy core file header. */
458 memcpy (tmpptr, &core, size);
459 set_tdata (abfd, tmpptr);
461 /* Set architecture. */
464 enum bfd_architecture arch;
467 switch (CNEW_IMPL (core.new))
472 arch = bfd_arch_rs6000;
473 mach = bfd_mach_rs6k;
476 arch = bfd_arch_powerpc;
480 bfd_default_set_arch_mach (abfd, arch, mach);
483 /* .stack section. */
484 if (!make_bfd_asection (abfd, ".stack",
485 SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
486 c_size, c_stackend - c_size, c_stack))
489 /* .reg section for all registers. */
490 if (!make_bfd_asection (abfd, ".reg",
492 c_regsize, (bfd_vma) 0, c_regoff))
496 To actually find out how long this section is in this particular
497 core dump would require going down the whole list of struct ld_info's.
498 See if we can just fake it. */
499 if (!make_bfd_asection (abfd, ".ldinfo",
501 c_lsize, (bfd_vma) 0, c_loader))
504 #ifndef CORE_VERSION_1
505 /* .data section if present.
506 AIX 3 dumps the complete data section and sets FULL_CORE if the
507 ulimit is large enough, otherwise the data section is omitted.
508 AIX 4 sets FULL_CORE even if the core file is truncated, we have
509 to examine core.c_datasize below to find out the actual size of
510 the .data section. */
511 if (c_flag & FULL_CORE)
513 if (!make_bfd_asection (abfd, ".data",
514 SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
515 (bfd_size_type) core.old.c_u.u_dsize,
517 CDATA_ADDR (core.old.c_u.u_dsize),
523 #ifdef CORE_VERSION_1
524 /* AIX 4 adds data sections from loaded objects to the core file,
525 which can be found by examining ldinfo, and anonymously mmapped
529 bfd_size_type ldi_datasize;
534 /* Fields from new and old core structures. */
535 bfd_size_type c_datasize, c_vmregions;
536 file_ptr c_data, c_vmm;
540 c_datasize = CNEW_DATASIZE (core.new);
541 c_data = (file_ptr) core.new.c_data;
542 c_vmregions = core.new.c_vmregions;
543 c_vmm = (file_ptr) core.new.c_vmm;
547 c_datasize = core.old.c_datasize;
548 c_data = (file_ptr) (ptr_to_uint) core.old.c_data;
549 c_vmregions = core.old.c_vmregions;
550 c_vmm = (file_ptr) (ptr_to_uint) core.old.c_vmm;
553 /* .data section from executable. */
556 if (!make_bfd_asection (abfd, ".data",
557 SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
559 (bfd_vma) CDATA_ADDR (c_datasize),
564 /* .data sections from loaded objects. */
566 size = (int) ((LdInfo *) 0)->l64.ldinfo_filename;
568 size = (int) ((LdInfo *) 0)->l32.ldinfo_filename;
572 if (bfd_seek (abfd, c_loader, SEEK_SET) != 0)
574 if (bfd_bread (&ldinfo, size, abfd) != size)
579 ldi_core = ldinfo.l64.ldinfo_core;
580 ldi_datasize = ldinfo.l64.ldinfo_datasize;
581 ldi_dataorg = (bfd_vma) ldinfo.l64.ldinfo_dataorg;
582 ldi_next = ldinfo.l64.ldinfo_next;
586 ldi_core = ldinfo.l32.ldinfo_core;
587 ldi_datasize = ldinfo.l32.ldinfo_datasize;
588 ldi_dataorg = (bfd_vma) (long) ldinfo.l32.ldinfo_dataorg;
589 ldi_next = ldinfo.l32.ldinfo_next;
593 if (!make_bfd_asection (abfd, ".data",
594 SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
595 ldi_datasize, ldi_dataorg, ldi_core))
600 c_loader += ldi_next;
603 /* .vmdata sections from anonymously mmapped regions. */
608 if (bfd_seek (abfd, c_vmm, SEEK_SET) != 0)
611 for (i = 0; i < c_vmregions; i++)
614 bfd_size_type vminfo_size;
615 file_ptr vminfo_offset;
618 size = CORE_NEW (core) ? sizeof (vminfo.new) : sizeof (vminfo.old);
619 if (bfd_bread (&vminfo, size, abfd) != size)
624 vminfo_addr = (bfd_vma) vminfo.new.vminfo_addr;
625 vminfo_size = vminfo.new.vminfo_size;
626 vminfo_offset = vminfo.new.vminfo_offset;
630 vminfo_addr = (bfd_vma) (long) vminfo.old.vminfo_addr;
631 vminfo_size = vminfo.old.vminfo_size;
632 vminfo_offset = vminfo.old.vminfo_offset;
636 if (!make_bfd_asection (abfd, ".vmdata",
637 SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
638 vminfo_size, vminfo_addr,
646 return abfd->xvec; /* This is garbage for now. */
649 bfd_release (abfd, abfd->tdata.any);
650 abfd->tdata.any = NULL;
651 bfd_section_list_clear (abfd);
655 /* Return `TRUE' if given core is from the given executable. */
658 rs6000coff_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd)
664 const char *str1, *str2;
668 if (!read_hdr (core_bfd, &core))
672 c_loader = CNEW_LOADER (core.new);
674 c_loader = (file_ptr) (ptr_to_uint) COLD_LOADER (core.old);
676 if (CORE_NEW (core) && CNEW_PROC64 (core.new))
677 size = (int) ((LdInfo *) 0)->l64.ldinfo_filename;
679 size = (int) ((LdInfo *) 0)->l32.ldinfo_filename;
681 if (bfd_seek (core_bfd, c_loader + size, SEEK_SET) != 0)
685 path = bfd_malloc ((bfd_size_type) alloc);
692 if (bfd_bread (s, (bfd_size_type) 1, core_bfd) != 1)
700 if (s == path + alloc)
705 n = bfd_realloc (path, (bfd_size_type) alloc);
716 str1 = strrchr (path, '/');
717 str2 = strrchr (exec_bfd->filename, '/');
719 /* step over character '/' */
720 str1 = str1 != NULL ? str1 + 1 : path;
721 str2 = str2 != NULL ? str2 + 1 : exec_bfd->filename;
723 if (strcmp (str1, str2) == 0)
734 rs6000coff_core_file_failing_command (bfd *abfd)
736 CoreHdr *core = core_hdr (abfd);
737 char *com = CORE_NEW (*core) ?
738 CNEW_COMM (core->new) : COLD_COMM (core->old);
747 rs6000coff_core_file_failing_signal (bfd *abfd)
749 CoreHdr *core = core_hdr (abfd);
750 return CORE_NEW (*core) ? core->new.c_signo : core->old.c_signo;
753 #endif /* AIX_CORE */