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/* Target-dependent code for FreeBSD, architecture-independent.
Copyright (C) 2002-2016 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "gdbcore.h"
#include "inferior.h"
#include "regcache.h"
#include "regset.h"
#include "gdbthread.h"
#include "elf-bfd.h"
#include "fbsd-tdep.h"
/* This is how we want PTIDs from core files to be printed. */
static char *
fbsd_core_pid_to_str (struct gdbarch *gdbarch, ptid_t ptid)
{
static char buf[80];
if (ptid_get_lwp (ptid) != 0)
{
xsnprintf (buf, sizeof buf, "LWP %ld", ptid_get_lwp (ptid));
return buf;
}
return normal_pid_to_str (ptid);
}
/* Extract the name assigned to a thread from a core. Returns the
string in a static buffer. */
static const char *
fbsd_core_thread_name (struct gdbarch *gdbarch, struct thread_info *thr)
{
static char buf[80];
struct bfd_section *section;
bfd_size_type size;
char sectionstr[32];
if (ptid_get_lwp (thr->ptid) != 0)
{
/* FreeBSD includes a NT_FREEBSD_THRMISC note for each thread
whose contents are defined by a "struct thrmisc" declared in
<sys/procfs.h> on FreeBSD. The per-thread name is stored as
a null-terminated string as the first member of the
structure. Rather than define the full structure here, just
extract the null-terminated name from the start of the
note. */
xsnprintf (sectionstr, sizeof sectionstr, ".thrmisc/%ld",
ptid_get_lwp (thr->ptid));
section = bfd_get_section_by_name (core_bfd, sectionstr);
if (section != NULL && bfd_section_size (core_bfd, section) > 0)
{
/* Truncate the name if it is longer than "buf". */
size = bfd_section_size (core_bfd, section);
if (size > sizeof buf - 1)
size = sizeof buf - 1;
if (bfd_get_section_contents (core_bfd, section, buf, (file_ptr) 0,
size)
&& buf[0] != '\0')
{
buf[size] = '\0';
/* Note that each thread will report the process command
as its thread name instead of an empty name if a name
has not been set explicitly. Return a NULL name in
that case. */
if (strcmp (buf, elf_tdata (core_bfd)->core->program) != 0)
return buf;
}
}
}
return NULL;
}
static int
find_signalled_thread (struct thread_info *info, void *data)
{
if (info->suspend.stop_signal != GDB_SIGNAL_0
&& ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid))
return 1;
return 0;
}
static enum gdb_signal
find_stop_signal (void)
{
struct thread_info *info =
iterate_over_threads (find_signalled_thread, NULL);
if (info)
return info->suspend.stop_signal;
else
return GDB_SIGNAL_0;
}
struct fbsd_collect_regset_section_cb_data
{
const struct regcache *regcache;
bfd *obfd;
char *note_data;
int *note_size;
};
static void
fbsd_collect_regset_section_cb (const char *sect_name, int size,
const struct regset *regset,
const char *human_name, void *cb_data)
{
char *buf;
struct fbsd_collect_regset_section_cb_data *data
= (struct fbsd_collect_regset_section_cb_data *) cb_data;
gdb_assert (regset->collect_regset);
buf = (char *) xmalloc (size);
regset->collect_regset (regset, data->regcache, -1, buf, size);
/* PRSTATUS still needs to be treated specially. */
if (strcmp (sect_name, ".reg") == 0)
data->note_data = (char *) elfcore_write_prstatus
(data->obfd, data->note_data, data->note_size,
ptid_get_pid (inferior_ptid), find_stop_signal (), buf);
else
data->note_data = (char *) elfcore_write_register_note
(data->obfd, data->note_data, data->note_size,
sect_name, buf, size);
xfree (buf);
}
/* Create appropriate note sections for a corefile, returning them in
allocated memory. */
static char *
fbsd_make_corefile_notes (struct gdbarch *gdbarch, bfd *obfd, int *note_size)
{
struct regcache *regcache = get_current_regcache ();
char *note_data;
Elf_Internal_Ehdr *i_ehdrp;
struct fbsd_collect_regset_section_cb_data data;
/* Put a "FreeBSD" label in the ELF header. */
i_ehdrp = elf_elfheader (obfd);
i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
gdb_assert (gdbarch_iterate_over_regset_sections_p (gdbarch));
data.regcache = regcache;
data.obfd = obfd;
data.note_data = NULL;
data.note_size = note_size;
target_fetch_registers (regcache, -1);
gdbarch_iterate_over_regset_sections (gdbarch,
fbsd_collect_regset_section_cb,
&data, regcache);
note_data = data.note_data;
if (get_exec_file (0))
{
const char *fname = lbasename (get_exec_file (0));
char *psargs = xstrdup (fname);
if (get_inferior_args ())
psargs = reconcat (psargs, psargs, " ", get_inferior_args (),
(char *) NULL);
note_data = elfcore_write_prpsinfo (obfd, note_data, note_size,
fname, psargs);
}
return note_data;
}
/* To be called from GDB_OSABI_FREEBSD_ELF handlers. */
void
fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
set_gdbarch_core_pid_to_str (gdbarch, fbsd_core_pid_to_str);
set_gdbarch_core_thread_name (gdbarch, fbsd_core_thread_name);
set_gdbarch_make_corefile_notes (gdbarch, fbsd_make_corefile_notes);
}
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