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authorJohn Baldwin <jhb@FreeBSD.org>2015-12-13 21:49:52 -0800
committerJohn Baldwin <jhb@FreeBSD.org>2016-01-19 08:18:30 -0800
commit791174281c341539fab650bd934cc0060b7c9720 (patch)
tree7e2a88f950c6d4d6e56d47ec357544f659305b43 /gdb/fbsd-tdep.c
parent4dfc5dbc4e1b267d440dd515a42fe6fd96a8d860 (diff)
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Display per-thread information for threads in FreeBSD cores.
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.
Diffstat (limited to 'gdb/fbsd-tdep.c')
-rw-r--r--gdb/fbsd-tdep.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/gdb/fbsd-tdep.c b/gdb/fbsd-tdep.c
index 0ef94d6..4284f38 100644
--- a/gdb/fbsd-tdep.c
+++ b/gdb/fbsd-tdep.c
@@ -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);
}