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Display per-thread information for threads in FreeBSD cores.

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Display the LWP ID of each thread in a FreeBSD core.  Extract thread
names from the per-thread THRMISC note.

gdb/ChangeLog:

	* fbsd_tdep.c (fbsd_core_pid_to_str): New function.
	(fbsd_core_thread_name): New function.
	(fbsd_init_abi): Add "core_pid_to_str" gdbarch method.
	Add "core_thread_name" gdbarch method.
This commit is contained in:
John Baldwin 2015-12-13 21:49:52 -08:00
parent 4dfc5dbc4e
commit 791174281c
2 changed files with 73 additions and 0 deletions
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7
gdb/ChangeLog
View File

@ -1,3 +1,10 @@
2016-01-19 John Baldwin <jhb@FreeBSD.org>
* fbsd_tdep.c (fbsd_core_pid_to_str): New function.
(fbsd_core_thread_name): New function.
(fbsd_init_abi): Add "core_pid_to_str" gdbarch method.
Add "core_thread_name" gdbarch method.
2016-01-19 John Baldwin <jhb@FreeBSD.org>
* corelow.c (core_thread_name): New function.

66
gdb/fbsd-tdep.c
View File

@ -28,6 +28,70 @@
#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)
{
@ -132,5 +196,7 @@ fbsd_make_corefile_notes (struct gdbarch *gdbarch, bfd *obfd, int *note_size)
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);
}