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Add the ability for GDB to printout the thread name along with other

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thread specific informations.

In order to do that, and in order to avoid KBI breakage with existing
infrastructure the following semantic is implemented:
- For live programs, a new member to the PT_LWPINFO is added (pl_tdname)
- For cores, a new ELF note is added (NT_THRMISC) that can be used for
  storing thread specific, miscellaneous, informations. Right now it is
  just popluated with a thread name.

GDB, then, retrieves the correct informations from the corefile via the
BFD interface, as it groks the ELF notes and create appropriate
pseudo-sections.

Sponsored by:	Sandvine Incorporated
Tested by:	gianni
Discussed with:	dim, kan, kib
MFC after:	2 weeks
This commit is contained in:
Attilio Rao 2010-11-22 14:42:13 +00:00
parent 7a3923c00e
commit 7f08176ee8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=215679
14 changed files with 131 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
contrib/binutils/bfd/elf-bfd.h
View File

@ -1673,6 +1673,8 @@ extern char * elfcore_write_pstatus
(bfd *, char *, int *, long, int, const void *);
extern char *elfcore_write_prfpreg
(bfd *, char *, int *, const void *, int);
extern char *elfcore_write_thrmisc
(bfd *, char *, int *, const char *, int);
extern char *elfcore_write_prxfpreg
(bfd *, char *, int *, const void *, int);
extern char *elfcore_write_lwpstatus

38
contrib/binutils/bfd/elf.c
View File

@ -6316,6 +6316,12 @@ _bfd_elf_rel_vtable_reloc_fn
#ifdef HAVE_SYS_PROCFS_H
# include <sys/procfs.h>
/* Define HAVE_THRMISC_T for consistency with other similar GNU-type stubs. */
#undef HAVE_THRMISC_T
#if defined (THRMISC_VERSION)
#define HAVE_THRMISC_T 1
#endif
#endif
/* FIXME: this is kinda wrong, but it's what gdb wants. */
@ -6497,6 +6503,16 @@ elfcore_grok_prxfpreg (bfd *abfd, Elf_Internal_Note *note)
return elfcore_make_note_pseudosection (abfd, ".reg-xfp", note);
}
#if defined (HAVE_THRMISC_T)
static bfd_boolean
elfcore_grok_thrmisc (bfd *abfd, Elf_Internal_Note *note)
{
return elfcore_make_note_pseudosection (abfd, ".tname", note);
}
#endif /* defined (HAVE_THRMISC_T) */
#if defined (HAVE_PRPSINFO_T)
typedef prpsinfo_t elfcore_psinfo_t;
#if defined (HAVE_PRPSINFO32_T) /* Sparc64 cross Sparc32 */
@ -6863,6 +6879,12 @@ elfcore_grok_note (bfd *abfd, Elf_Internal_Note *note)
return TRUE;
}
#if defined (HAVE_THRMISC_T)
case NT_THRMISC:
return elfcore_grok_thrmisc (abfd, note);
#endif
}
}
@ -7244,6 +7266,22 @@ elfcore_write_prfpreg (bfd *abfd,
note_name, NT_FPREGSET, fpregs, size);
}
char *
elfcore_write_thrmisc (bfd *abfd,
char *buf,
int *bufsiz,
const char *tname,
int size)
{
#if defined (HAVE_THRMISC_T)
char *note_name = "CORE";
return elfcore_write_note (abfd, buf, bufsiz,
note_name, NT_THRMISC, tname, size);
#else
return buf;
#endif
}
char *
elfcore_write_prxfpreg (bfd *abfd,
char *buf,

1
contrib/binutils/binutils/readelf.c
View File

@ -9908,6 +9908,7 @@ get_note_type (unsigned e_type)
case NT_PSTATUS: return _("NT_PSTATUS (pstatus structure)");
case NT_FPREGS: return _("NT_FPREGS (floating point registers)");
case NT_PSINFO: return _("NT_PSINFO (psinfo structure)");
case NT_THRMISC: return _("NT_THRMISC (thrmisc structure)");
case NT_LWPSTATUS: return _("NT_LWPSTATUS (lwpstatus_t structure)");
case NT_LWPSINFO: return _("NT_LWPSINFO (lwpsinfo_t structure)");
case NT_WIN32PSTATUS: return _("NT_WIN32PSTATUS (win32_pstatus structure)");

1
contrib/binutils/include/elf/common.h
View File

@ -366,6 +366,7 @@
#define NT_PRPSINFO 3 /* Contains copy of prpsinfo struct */
#define NT_TASKSTRUCT 4 /* Contains copy of task struct */
#define NT_AUXV 6 /* Contains copy of Elfxx_auxv_t */
#define NT_THRMISC 7 /* Contains copy of thrmisc struct */
#define NT_PRXFPREG 0x46e62b7f /* Contains a user_xfpregs_struct; */
/* note name must be "LINUX". */

1
contrib/file/readelf.h
View File

@ -224,6 +224,7 @@ typedef struct {
#define NT_TASKSTRUCT 4
#define NT_PLATFORM 5
#define NT_AUXV 6
#define NT_THRMISC 7
/* Note types used in executables */
/* NetBSD executables (name = "NetBSD") */

5
contrib/gdb/gdb/fbsd-proc.c
View File

@ -124,6 +124,7 @@ fbsd_make_corefile_notes (bfd *obfd, int *note_size)
fpregset_t fpregs;
char *note_data = NULL;
Elf_Internal_Ehdr *i_ehdrp;
char fakename;
/* Put a "FreeBSD" label in the ELF header. */
i_ehdrp = elf_elfheader (obfd);
@ -138,6 +139,10 @@ fbsd_make_corefile_notes (bfd *obfd, int *note_size)
note_data = elfcore_write_prfpreg (obfd, note_data, note_size,
&fpregs, sizeof (fpregs));
fakename = '\0';
note_data = elfcore_write_thrmisc (obfd, note_data, note_size,
&fakename, sizeof (fakename));
if (get_exec_file (0))
{
char *fname = strrchr (get_exec_file (0), '/') + 1;

47
gnu/usr.bin/gdb/libgdb/fbsd-threads.c
View File

@ -426,6 +426,46 @@ fbsd_thread_deactivate (void)
init_thread_list ();
}
static char *
fbsd_thread_get_name (lwpid_t lwpid)
{
static char last_thr_name[MAXCOMLEN + 1];
char section_name[32];
struct ptrace_lwpinfo lwpinfo;
bfd_size_type size;
struct bfd_section *section;
if (target_has_execution)
{
if (ptrace (PT_LWPINFO, lwpid, (caddr_t)&lwpinfo, sizeof (lwpinfo)) == -1)
goto fail;
strncpy (last_thr_name, lwpinfo.pl_tdname, sizeof (last_thr_name) - 1);
}
else
{
snprintf (section_name, sizeof (section_name), ".tname/%u", lwpid);
section = bfd_get_section_by_name (core_bfd, section_name);
if (! section)
goto fail;
/* Section size fix-up. */
size = bfd_section_size (core_bfd, section);
if (size > sizeof (last_thr_name))
size = sizeof (last_thr_name);
if (! bfd_get_section_contents (core_bfd, section, last_thr_name,
(file_ptr)0, size))
goto fail;
if (last_thr_name[0] == '\0')
goto fail;
}
last_thr_name[sizeof (last_thr_name) - 1] = '\0';
return last_thr_name;
fail:
strcpy (last_thr_name, "<unknown>");
return last_thr_name;
}
static void
fbsd_thread_new_objfile (struct objfile *objfile)
{
@ -1158,7 +1198,7 @@ fbsd_thread_find_new_threads (void)
static char *
fbsd_thread_pid_to_str (ptid_t ptid)
{
static char buf[64];
static char buf[64 + MAXCOMLEN];
if (IS_THREAD (ptid))
{
@ -1178,8 +1218,9 @@ fbsd_thread_pid_to_str (ptid_t ptid)
if (ti.ti_lid != 0)
{
snprintf (buf, sizeof (buf), "Thread %llx (LWP %d)",
(unsigned long long)th.th_thread, ti.ti_lid);
snprintf (buf, sizeof (buf), "Thread %llx (LWP %d/%s)",
(unsigned long long)th.th_thread, ti.ti_lid,
fbsd_thread_get_name (ti.ti_lid));
}
else
{

5
sys/compat/freebsd32/freebsd32.h
View File

@ -240,6 +240,11 @@ struct prpsinfo32 {
char pr_psargs[PRARGSZ+1];
};
struct thrmisc32 {
char pr_tname[MAXCOMLEN+1];
u_int _pad;
};
struct mq_attr32 {
int mq_flags;
int mq_maxmsg;

10
sys/kern/imgact_elf.c
View File

@ -1316,12 +1316,14 @@ typedef struct prpsinfo32 elf_prpsinfo_t;
typedef struct fpreg32 elf_prfpregset_t;
typedef struct fpreg32 elf_fpregset_t;
typedef struct reg32 elf_gregset_t;
typedef struct thrmisc32 elf_thrmisc_t;
#else
typedef prstatus_t elf_prstatus_t;
typedef prpsinfo_t elf_prpsinfo_t;
typedef prfpregset_t elf_prfpregset_t;
typedef prfpregset_t elf_fpregset_t;
typedef gregset_t elf_gregset_t;
typedef thrmisc_t elf_thrmisc_t;
#endif
static void
@ -1331,10 +1333,12 @@ __elfN(puthdr)(struct thread *td, void *dst, size_t *off, int numsegs)
elf_prstatus_t status;
elf_prfpregset_t fpregset;
elf_prpsinfo_t psinfo;
elf_thrmisc_t thrmisc;
} *tempdata;
elf_prstatus_t *status;
elf_prfpregset_t *fpregset;
elf_prpsinfo_t *psinfo;
elf_thrmisc_t *thrmisc;
struct proc *p;
struct thread *thr;
size_t ehoff, noteoff, notesz, phoff;
@ -1357,11 +1361,13 @@ __elfN(puthdr)(struct thread *td, void *dst, size_t *off, int numsegs)
status = &tempdata->status;
fpregset = &tempdata->fpregset;
psinfo = &tempdata->psinfo;
thrmisc = &tempdata->thrmisc;
} else {
tempdata = NULL;
status = NULL;
fpregset = NULL;
psinfo = NULL;
thrmisc = NULL;
}
if (dst != NULL) {
@ -1401,11 +1407,15 @@ __elfN(puthdr)(struct thread *td, void *dst, size_t *off, int numsegs)
fill_regs(thr, &status->pr_reg);
fill_fpregs(thr, fpregset);
#endif
memset(&thrmisc->_pad, 0, sizeof (thrmisc->_pad));
strcpy(thrmisc->pr_tname, thr->td_name);
}
__elfN(putnote)(dst, off, "FreeBSD", NT_PRSTATUS, status,
sizeof *status);
__elfN(putnote)(dst, off, "FreeBSD", NT_FPREGSET, fpregset,
sizeof *fpregset);
__elfN(putnote)(dst, off, "FreeBSD", NT_THRMISC, thrmisc,
sizeof *thrmisc);
/*
* Allow for MD specific notes, as well as any MD
* specific preparations for writing MI notes.

3
sys/kern/sys_process.c
View File

@ -93,6 +93,7 @@ struct ptrace_lwpinfo32 {
sigset_t pl_sigmask; /* LWP signal mask */
sigset_t pl_siglist; /* LWP pending signal */
struct siginfo32 pl_siginfo; /* siginfo for signal */
char pl_tdname[MAXCOMLEN + 1]; /* LWP name. */
};
#endif
@ -520,6 +521,7 @@ ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl,
pl32->pl_sigmask = pl->pl_sigmask;
pl32->pl_siglist = pl->pl_siglist;
siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo);
strcpy(pl32->pl_tdname, pl->pl_tdname);
}
#endif /* COMPAT_FREEBSD32 */
@ -1164,6 +1166,7 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
pl->pl_flags |= PL_FLAG_EXEC;
pl->pl_sigmask = td2->td_sigmask;
pl->pl_siglist = td2->td_siglist;
strcpy(pl->pl_tdname, td2->td_name);
#ifdef COMPAT_FREEBSD32
if (wrap32)
ptrace_lwpinfo_to32(pl, pl32);

1
sys/sys/elf_common.h
View File

@ -479,6 +479,7 @@ typedef struct {
#define NT_PRSTATUS 1 /* Process status. */
#define NT_FPREGSET 2 /* Floating point registers. */
#define NT_PRPSINFO 3 /* Process state info. */
#define NT_THRMISC 7 /* Thread miscellaneous info. */
/* Symbol Binding - ELFNN_ST_BIND - st_info */
#define STB_LOCAL 0 /* Local symbol */

7
sys/sys/procfs.h
View File

@ -80,6 +80,13 @@ typedef struct prpsinfo {
char pr_psargs[PRARGSZ+1]; /* Arguments, null terminated (1) */
} prpsinfo_t;
#define THRMISC_VERSION 1 /* Current version of thrmisc_t */
typedef struct thrmisc {
char pr_tname[MAXCOMLEN+1]; /* Thread name, null terminated (1) */
u_int _pad; /* Convenience pad, 0-filled (1) */
} thrmisc_t;
typedef uint64_t psaddr_t; /* An address in the target process. */
#endif /* _SYS_PROCFS_H_ */

2
sys/sys/ptrace.h
View File

@ -34,6 +34,7 @@
#define _SYS_PTRACE_H_
#include <sys/signal.h>
#include <sys/param.h>
#include <machine/reg.h>
#define PT_TRACE_ME 0 /* child declares it's being traced */
@ -106,6 +107,7 @@ struct ptrace_lwpinfo {
sigset_t pl_sigmask; /* LWP signal mask */
sigset_t pl_siglist; /* LWP pending signal */
struct __siginfo pl_siginfo; /* siginfo for signal */
char pl_tdname[MAXCOMLEN + 1]; /* LWP name */
};
/* Argument structure for PT_VM_ENTRY. */

11
usr.bin/gcore/elfcore.c
View File

@ -284,10 +284,12 @@ elf_getstatus(pid_t pid, prpsinfo_t *psinfo)
static void
elf_puthdr(pid_t pid, vm_map_entry_t map, void *dst, size_t *off, int numsegs)
{
struct ptrace_lwpinfo lwpinfo;
struct {
prstatus_t status;
prfpregset_t fpregset;
prpsinfo_t psinfo;
thrmisc_t thrmisc;
} *tempdata;
size_t ehoff;
size_t phoff;
@ -300,6 +302,7 @@ elf_puthdr(pid_t pid, vm_map_entry_t map, void *dst, size_t *off, int numsegs)
prstatus_t *status;
prfpregset_t *fpregset;
prpsinfo_t *psinfo;
thrmisc_t *thrmisc;
ehoff = *off;
*off += sizeof(Elf_Ehdr);
@ -315,11 +318,13 @@ elf_puthdr(pid_t pid, vm_map_entry_t map, void *dst, size_t *off, int numsegs)
status = &tempdata->status;
fpregset = &tempdata->fpregset;
psinfo = &tempdata->psinfo;
thrmisc = &tempdata->thrmisc;
} else {
tempdata = NULL;
status = NULL;
fpregset = NULL;
psinfo = NULL;
thrmisc = NULL;
}
errno = 0;
@ -356,11 +361,17 @@ elf_puthdr(pid_t pid, vm_map_entry_t map, void *dst, size_t *off, int numsegs)
ptrace(PT_GETREGS, tids[i], (void *)&status->pr_reg, 0);
ptrace(PT_GETFPREGS, tids[i], (void *)fpregset, 0);
ptrace(PT_LWPINFO, tids[i], (void *)&lwpinfo,
sizeof(lwpinfo));
memset(&thrmisc->_pad, 0, sizeof(thrmisc->_pad));
strcpy(thrmisc->pr_tname, lwpinfo.pl_tdname);
}
elf_putnote(dst, off, "FreeBSD", NT_PRSTATUS, status,
sizeof *status);
elf_putnote(dst, off, "FreeBSD", NT_FPREGSET, fpregset,
sizeof *fpregset);
elf_putnote(dst, off, "FreeBSD", NT_THRMISC, thrmisc,
sizeof *thrmisc);
}
notesz = *off - noteoff;