423 lines
13 KiB
C
423 lines
13 KiB
C
/* BFD back-end for HP/UX core files.
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Copyright (C) 1993-2022 Free Software Foundation, Inc.
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Written by Stu Grossman, Cygnus Support.
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Converted to back-end form by Ian Lance Taylor, Cygnus SUpport
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/* This file can only be compiled on systems which use HP/UX style
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core files. */
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#include "sysdep.h"
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#include "bfd.h"
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#include "libbfd.h"
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#if defined (HOST_HPPAHPUX) || defined (HOST_HPPAMPEIX)
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/* FIXME: sys/core.h doesn't exist for HPUX version 7. HPUX version
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5, 6, and 7 core files seem to be standard trad-core.c type core
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files; can we just use trad-core.c in addition to this file? */
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#include <sys/core.h>
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#include <sys/utsname.h>
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#endif /* HOST_HPPAHPUX */
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#ifdef HOST_HPPABSD
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/* Not a very swift place to put it, but that's where the BSD port
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puts them. */
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#include "/hpux/usr/include/sys/core.h"
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#endif /* HOST_HPPABSD */
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#include <sys/param.h>
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#include <dirent.h>
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#include <signal.h>
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#ifdef HPUX_CORE
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#include <machine/reg.h>
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#endif
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#include <sys/file.h>
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/* Kludge: There's no explicit mechanism provided by sys/core.h to
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conditionally know whether a proc_info has thread id fields.
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However, CORE_ANON_SHMEM shows up first at 10.30, which is
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happily also when meaningful thread id's show up in proc_info. */
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#if defined(CORE_ANON_SHMEM)
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#define PROC_INFO_HAS_THREAD_ID (1)
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#endif
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/* This type appears at HP-UX 10.30. Defining it if not defined
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by sys/core.h allows us to build for older HP-UX's, and (since
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it won't be encountered in core-dumps from older HP-UX's) is
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harmless. */
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#if !defined(CORE_ANON_SHMEM)
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#define CORE_ANON_SHMEM 0x00000200 /* anonymous shared memory */
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#endif
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/* These are stored in the bfd's tdata */
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/* .lwpid and .user_tid are only valid if PROC_INFO_HAS_THREAD_ID, else they
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are set to 0. Also, until HP-UX implements MxN threads, .user_tid and
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.lwpid are synonymous. */
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struct hpux_core_struct
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{
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int sig;
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int lwpid; /* Kernel thread ID. */
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unsigned long user_tid; /* User thread ID. */
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char cmd[MAXCOMLEN + 1];
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};
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#define core_hdr(bfd) ((bfd)->tdata.hpux_core_data)
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#define core_signal(bfd) (core_hdr(bfd)->sig)
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#define core_command(bfd) (core_hdr(bfd)->cmd)
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#define core_kernel_thread_id(bfd) (core_hdr(bfd)->lwpid)
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#define core_user_thread_id(bfd) (core_hdr(bfd)->user_tid)
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#define hpux_core_core_file_matches_executable_p generic_core_file_matches_executable_p
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#define hpux_core_core_file_pid _bfd_nocore_core_file_pid
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static asection *make_bfd_asection (bfd *, const char *, flagword,
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bfd_size_type, bfd_vma, unsigned int);
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static bfd_cleanup hpux_core_core_file_p (bfd *);
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static char *hpux_core_core_file_failing_command (bfd *);
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static int hpux_core_core_file_failing_signal (bfd *);
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static void swap_abort (void);
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static asection *
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make_bfd_asection (bfd *abfd, const char *name, flagword flags,
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bfd_size_type size, bfd_vma vma,
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unsigned int alignment_power)
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{
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asection *asect;
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char *newname;
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newname = bfd_alloc (abfd, (bfd_size_type) strlen (name) + 1);
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if (!newname)
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return NULL;
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strcpy (newname, name);
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asect = bfd_make_section_anyway_with_flags (abfd, newname, flags);
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if (!asect)
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return NULL;
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asect->size = size;
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asect->vma = vma;
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asect->filepos = bfd_tell (abfd);
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asect->alignment_power = alignment_power;
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return asect;
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}
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/* Return true if the given core file section corresponds to a thread,
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based on its name. */
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static int
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thread_section_p (bfd *abfd ATTRIBUTE_UNUSED,
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asection *sect,
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void *obj ATTRIBUTE_UNUSED)
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{
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return startswith (sect->name, ".reg/");
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}
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/* this function builds a bfd target if the file is a corefile.
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It returns null or 0 if it finds out thaat it is not a core file.
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The way it checks this is by looking for allowed 'type' field values.
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These are declared in sys/core.h
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There are some values which are 'reserved for future use'. In particular
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CORE_NONE is actually defined as 0. This may be a catch-all for cases
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in which the core file is generated by some non-hpux application.
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(I am just guessing here!)
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*/
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static bfd_cleanup
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hpux_core_core_file_p (bfd *abfd)
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{
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int good_sections = 0;
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int unknown_sections = 0;
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core_hdr (abfd) = (struct hpux_core_struct *)
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bfd_zalloc (abfd, (bfd_size_type) sizeof (struct hpux_core_struct));
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if (!core_hdr (abfd))
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return NULL;
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while (1)
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{
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int val;
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struct corehead core_header;
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val = bfd_bread ((void *) &core_header,
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(bfd_size_type) sizeof core_header, abfd);
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if (val <= 0)
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break;
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switch (core_header.type)
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{
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case CORE_KERNEL:
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case CORE_FORMAT:
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/* Just skip this. */
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bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);
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good_sections++;
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break;
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case CORE_EXEC:
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{
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struct proc_exec proc_exec;
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if (bfd_bread ((void *) &proc_exec, (bfd_size_type) core_header.len,
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abfd) != core_header.len)
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break;
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strncpy (core_command (abfd), proc_exec.cmd, MAXCOMLEN + 1);
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good_sections++;
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}
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break;
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case CORE_PROC:
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{
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struct proc_info proc_info;
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char secname[100]; /* Of arbitrary size, but plenty large. */
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/* We need to read this section, 'cause we need to determine
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whether the core-dumped app was threaded before we create
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any .reg sections. */
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if (bfd_bread (&proc_info, (bfd_size_type) core_header.len, abfd)
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!= core_header.len)
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break;
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/* However, we also want to create those sections with the
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file positioned at the start of the record, it seems. */
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if (bfd_seek (abfd, -((file_ptr) core_header.len), SEEK_CUR) != 0)
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break;
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#if defined(PROC_INFO_HAS_THREAD_ID)
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core_kernel_thread_id (abfd) = proc_info.lwpid;
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core_user_thread_id (abfd) = proc_info.user_tid;
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#else
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core_kernel_thread_id (abfd) = 0;
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core_user_thread_id (abfd) = 0;
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#endif
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/* If the program was unthreaded, then we'll just create a
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.reg section.
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If the program was threaded, then we'll create .reg/XXXXX
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section for each thread, where XXXXX is a printable
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representation of the kernel thread id. We'll also
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create a .reg section for the thread that was running
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and signalled at the time of the core-dump (i.e., this
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is effectively an alias, needed to keep GDB happy.)
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Note that we use `.reg/XXXXX' as opposed to '.regXXXXX'
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because GDB expects that .reg2 will be the floating-
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point registers. */
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if (core_kernel_thread_id (abfd) == 0)
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{
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if (!make_bfd_asection (abfd, ".reg",
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SEC_HAS_CONTENTS,
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core_header.len,
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(bfd_vma) offsetof (struct proc_info,
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hw_regs),
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2))
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goto fail;
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}
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else
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{
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/* There are threads. Is this the one that caused the
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core-dump? We'll claim it was the running thread. */
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if (proc_info.sig != -1)
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{
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if (!make_bfd_asection (abfd, ".reg",
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SEC_HAS_CONTENTS,
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core_header.len,
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(bfd_vma)offsetof (struct proc_info,
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hw_regs),
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2))
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goto fail;
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}
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/* We always make one of these sections, for every thread. */
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sprintf (secname, ".reg/%d", core_kernel_thread_id (abfd));
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if (!make_bfd_asection (abfd, secname,
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SEC_HAS_CONTENTS,
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core_header.len,
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(bfd_vma) offsetof (struct proc_info,
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hw_regs),
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2))
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goto fail;
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}
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core_signal (abfd) = proc_info.sig;
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if (bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR) != 0)
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break;
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good_sections++;
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}
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break;
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case CORE_DATA:
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case CORE_STACK:
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case CORE_TEXT:
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case CORE_MMF:
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case CORE_SHM:
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case CORE_ANON_SHMEM:
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if (!make_bfd_asection (abfd, ".data",
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SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
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core_header.len,
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(bfd_vma) core_header.addr, 2))
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goto fail;
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bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);
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good_sections++;
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break;
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case CORE_NONE:
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/* Let's not punt if we encounter a section of unknown
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type. Rather, let's make a note of it. If we later
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see that there were also "good" sections, then we'll
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declare that this a core file, but we'll also warn that
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it may be incompatible with this gdb.
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*/
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unknown_sections++;
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break;
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default:
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goto fail; /*unrecognized core file type */
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}
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}
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/* OK, we believe you. You're a core file (sure, sure). */
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/* On HP/UX, we sometimes encounter core files where none of the threads
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was found to be the running thread (ie the signal was set to -1 for
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all threads). This happens when the program was aborted externally
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via a TT_CORE ttrace system call. In that case, we just pick one
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thread at random to be the active thread. */
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if (core_kernel_thread_id (abfd) != 0
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&& bfd_get_section_by_name (abfd, ".reg") == NULL)
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{
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asection *asect = bfd_sections_find_if (abfd, thread_section_p, NULL);
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asection *reg_sect;
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if (asect != NULL)
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{
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reg_sect = make_bfd_asection (abfd, ".reg", asect->flags,
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asect->size, asect->vma,
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asect->alignment_power);
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if (reg_sect == NULL)
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goto fail;
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reg_sect->filepos = asect->filepos;
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}
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}
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/* Were there sections of unknown type? If so, yet there were
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at least some complete sections of known type, then, issue
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a warning. Possibly the core file was generated on a version
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of HP-UX that is incompatible with that for which this gdb was
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built.
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*/
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if ((unknown_sections > 0) && (good_sections > 0))
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_bfd_error_handler
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("%pB appears to be a core file,\nbut contains unknown sections."
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" It may have been created on an incompatible\nversion of HP-UX."
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" As a result, some information may be unavailable.\n",
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abfd);
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return _bfd_no_cleanup;
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fail:
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bfd_release (abfd, core_hdr (abfd));
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core_hdr (abfd) = NULL;
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bfd_section_list_clear (abfd);
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return NULL;
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}
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static char *
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hpux_core_core_file_failing_command (bfd *abfd)
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{
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return core_command (abfd);
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}
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static int
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hpux_core_core_file_failing_signal (bfd *abfd)
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{
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return core_signal (abfd);
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}
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/* If somebody calls any byte-swapping routines, shoot them. */
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static void
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swap_abort (void)
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{
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abort(); /* This way doesn't require any declaration for ANSI to fuck up */
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}
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#define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
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#define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
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#define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
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#define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
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#define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
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#define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
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const bfd_target core_hpux_vec =
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{
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"hpux-core",
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bfd_target_unknown_flavour,
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BFD_ENDIAN_BIG, /* target byte order */
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BFD_ENDIAN_BIG, /* target headers byte order */
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(HAS_RELOC | EXEC_P | /* object flags */
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HAS_LINENO | HAS_DEBUG |
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HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
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(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
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0, /* symbol prefix */
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' ', /* ar_pad_char */
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16, /* ar_max_namelen */
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0, /* match priority. */
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TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols. */
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NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */
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NO_GET, NO_GETS, NO_PUT, /* 32 bit data */
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NO_GET, NO_GETS, NO_PUT, /* 16 bit data */
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NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */
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NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */
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NO_GET, NO_GETS, NO_PUT, /* 16 bit hdrs */
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{ /* bfd_check_format */
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_bfd_dummy_target, /* unknown format */
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_bfd_dummy_target, /* object file */
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_bfd_dummy_target, /* archive */
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hpux_core_core_file_p /* a core file */
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},
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{ /* bfd_set_format */
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_bfd_bool_bfd_false_error,
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_bfd_bool_bfd_false_error,
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_bfd_bool_bfd_false_error,
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_bfd_bool_bfd_false_error
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},
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{ /* bfd_write_contents */
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_bfd_bool_bfd_false_error,
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_bfd_bool_bfd_false_error,
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_bfd_bool_bfd_false_error,
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_bfd_bool_bfd_false_error
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},
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BFD_JUMP_TABLE_GENERIC (_bfd_generic),
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BFD_JUMP_TABLE_COPY (_bfd_generic),
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BFD_JUMP_TABLE_CORE (hpux_core),
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BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
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BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
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BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
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BFD_JUMP_TABLE_WRITE (_bfd_generic),
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BFD_JUMP_TABLE_LINK (_bfd_nolink),
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BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
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NULL,
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NULL /* backend_data */
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};
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