/* Native-dependent code for FreeBSD.
- Copyright (C) 2002, 2003, 2004, 2007, 2008, 2009, 2010, 2011
- Free Software Foundation, Inc.
+ Copyright (C) 2002-2020 Free Software Foundation, Inc.
This file is part of GDB.
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
+#include "gdbsupport/byte-vector.h"
#include "gdbcore.h"
#include "inferior.h"
#include "regcache.h"
#include "regset.h"
+#include "gdbarch.h"
+#include "gdbcmd.h"
#include "gdbthread.h"
-
-#include "gdb_assert.h"
-#include "gdb_string.h"
+#include "gdbsupport/gdb_wait.h"
+#include "inf-ptrace.h"
#include <sys/types.h>
#include <sys/procfs.h>
+#include <sys/ptrace.h>
+#include <sys/signal.h>
#include <sys/sysctl.h>
+#include <sys/user.h>
+#if defined(HAVE_KINFO_GETFILE) || defined(HAVE_KINFO_GETVMMAP)
+#include <libutil.h>
+#endif
+#if !defined(HAVE_KINFO_GETVMMAP)
+#include "gdbsupport/filestuff.h"
+#endif
#include "elf-bfd.h"
#include "fbsd-nat.h"
+#include "fbsd-tdep.h"
+
+#include <list>
-/* Return a the name of file that can be opened to get the symbols for
+/* Return the name of a file that can be opened to get the symbols for
the child process identified by PID. */
char *
-fbsd_pid_to_exec_file (int pid)
+fbsd_nat_target::pid_to_exec_file (int pid)
{
- size_t len = MAXPATHLEN;
- char *buf = xcalloc (len, sizeof (char));
- char *path;
+ ssize_t len;
+ static char buf[PATH_MAX];
+ char name[PATH_MAX];
#ifdef KERN_PROC_PATHNAME
+ size_t buflen;
int mib[4];
mib[0] = CTL_KERN;
mib[1] = KERN_PROC;
mib[2] = KERN_PROC_PATHNAME;
mib[3] = pid;
- if (sysctl (mib, 4, buf, &len, NULL, 0) == 0)
- return buf;
+ buflen = sizeof buf;
+ if (sysctl (mib, 4, buf, &buflen, NULL, 0) == 0)
+ /* The kern.proc.pathname.<pid> sysctl returns a length of zero
+ for processes without an associated executable such as kernel
+ processes. */
+ return buflen == 0 ? NULL : buf;
#endif
- path = xstrprintf ("/proc/%d/file", pid);
- if (readlink (path, buf, MAXPATHLEN) == -1)
+ xsnprintf (name, PATH_MAX, "/proc/%d/exe", pid);
+ len = readlink (name, buf, PATH_MAX - 1);
+ if (len != -1)
{
- xfree (buf);
- buf = NULL;
+ buf[len] = '\0';
+ return buf;
}
- xfree (path);
- return buf;
+ return NULL;
}
+#ifdef HAVE_KINFO_GETVMMAP
+/* Iterate over all the memory regions in the current inferior,
+ calling FUNC for each memory region. OBFD is passed as the last
+ argument to FUNC. */
+
+int
+fbsd_nat_target::find_memory_regions (find_memory_region_ftype func,
+ void *obfd)
+{
+ pid_t pid = inferior_ptid.pid ();
+ struct kinfo_vmentry *kve;
+ uint64_t size;
+ int i, nitems;
+
+ gdb::unique_xmalloc_ptr<struct kinfo_vmentry>
+ vmentl (kinfo_getvmmap (pid, &nitems));
+ if (vmentl == NULL)
+ perror_with_name (_("Couldn't fetch VM map entries."));
+
+ for (i = 0, kve = vmentl.get (); i < nitems; i++, kve++)
+ {
+ /* Skip unreadable segments and those where MAP_NOCORE has been set. */
+ if (!(kve->kve_protection & KVME_PROT_READ)
+ || kve->kve_flags & KVME_FLAG_NOCOREDUMP)
+ continue;
+
+ /* Skip segments with an invalid type. */
+ if (kve->kve_type != KVME_TYPE_DEFAULT
+ && kve->kve_type != KVME_TYPE_VNODE
+ && kve->kve_type != KVME_TYPE_SWAP
+ && kve->kve_type != KVME_TYPE_PHYS)
+ continue;
+
+ size = kve->kve_end - kve->kve_start;
+ if (info_verbose)
+ {
+ fprintf_filtered (gdb_stdout,
+ "Save segment, %ld bytes at %s (%c%c%c)\n",
+ (long) size,
+ paddress (target_gdbarch (), kve->kve_start),
+ kve->kve_protection & KVME_PROT_READ ? 'r' : '-',
+ kve->kve_protection & KVME_PROT_WRITE ? 'w' : '-',
+ kve->kve_protection & KVME_PROT_EXEC ? 'x' : '-');
+ }
+
+ /* Invoke the callback function to create the corefile segment.
+ Pass MODIFIED as true, we do not know the real modification state. */
+ func (kve->kve_start, size, kve->kve_protection & KVME_PROT_READ,
+ kve->kve_protection & KVME_PROT_WRITE,
+ kve->kve_protection & KVME_PROT_EXEC, 1, obfd);
+ }
+ return 0;
+}
+#else
static int
fbsd_read_mapping (FILE *mapfile, unsigned long *start, unsigned long *end,
char *protection)
argument to FUNC. */
int
-fbsd_find_memory_regions (find_memory_region_ftype func, void *obfd)
+fbsd_nat_target::find_memory_regions (find_memory_region_ftype func,
+ void *obfd)
{
- pid_t pid = ptid_get_pid (inferior_ptid);
- char *mapfilename;
- FILE *mapfile;
+ pid_t pid = inferior_ptid.pid ();
unsigned long start, end, size;
char protection[4];
int read, write, exec;
- struct cleanup *cleanup;
- mapfilename = xstrprintf ("/proc/%ld/map", (long) pid);
- cleanup = make_cleanup (xfree, mapfilename);
- mapfile = fopen (mapfilename, "r");
+ std::string mapfilename = string_printf ("/proc/%ld/map", (long) pid);
+ gdb_file_up mapfile (fopen (mapfilename.c_str (), "r"));
if (mapfile == NULL)
- error (_("Couldn't open %s."), mapfilename);
- make_cleanup_fclose (mapfile);
+ error (_("Couldn't open %s."), mapfilename.c_str ());
if (info_verbose)
fprintf_filtered (gdb_stdout,
- "Reading memory regions from %s\n", mapfilename);
+ "Reading memory regions from %s\n", mapfilename.c_str ());
/* Now iterate until end-of-file. */
- while (fbsd_read_mapping (mapfile, &start, &end, &protection[0]))
+ while (fbsd_read_mapping (mapfile.get (), &start, &end, &protection[0]))
{
size = end - start;
{
fprintf_filtered (gdb_stdout,
"Save segment, %ld bytes at %s (%c%c%c)\n",
- size, paddress (target_gdbarch, start),
+ size, paddress (target_gdbarch (), start),
read ? 'r' : '-',
write ? 'w' : '-',
exec ? 'x' : '-');
}
- /* Invoke the callback function to create the corefile segment. */
- func (start, size, read, write, exec, obfd);
+ /* Invoke the callback function to create the corefile segment.
+ Pass MODIFIED as true, we do not know the real modification state. */
+ func (start, size, read, write, exec, 1, obfd);
}
- do_cleanups (cleanup);
return 0;
}
+#endif
-static int
-find_signalled_thread (struct thread_info *info, void *data)
+/* Fetch the command line for a running process. */
+
+static gdb::unique_xmalloc_ptr<char>
+fbsd_fetch_cmdline (pid_t pid)
+{
+ size_t len;
+ int mib[4];
+
+ len = 0;
+ mib[0] = CTL_KERN;
+ mib[1] = KERN_PROC;
+ mib[2] = KERN_PROC_ARGS;
+ mib[3] = pid;
+ if (sysctl (mib, 4, NULL, &len, NULL, 0) == -1)
+ return nullptr;
+
+ if (len == 0)
+ return nullptr;
+
+ gdb::unique_xmalloc_ptr<char> cmdline ((char *) xmalloc (len));
+ if (sysctl (mib, 4, cmdline.get (), &len, NULL, 0) == -1)
+ return nullptr;
+
+ /* Join the arguments with spaces to form a single string. */
+ char *cp = cmdline.get ();
+ for (size_t i = 0; i < len - 1; i++)
+ if (cp[i] == '\0')
+ cp[i] = ' ';
+ cp[len - 1] = '\0';
+
+ return cmdline;
+}
+
+/* Fetch the external variant of the kernel's internal process
+ structure for the process PID into KP. */
+
+static bool
+fbsd_fetch_kinfo_proc (pid_t pid, struct kinfo_proc *kp)
+{
+ size_t len;
+ int mib[4];
+
+ len = sizeof *kp;
+ mib[0] = CTL_KERN;
+ mib[1] = KERN_PROC;
+ mib[2] = KERN_PROC_PID;
+ mib[3] = pid;
+ return (sysctl (mib, 4, kp, &len, NULL, 0) == 0);
+}
+
+/* Implement the "info_proc" target_ops method. */
+
+bool
+fbsd_nat_target::info_proc (const char *args, enum info_proc_what what)
+{
+#ifdef HAVE_KINFO_GETFILE
+ gdb::unique_xmalloc_ptr<struct kinfo_file> fdtbl;
+ int nfd = 0;
+#endif
+ struct kinfo_proc kp;
+ pid_t pid;
+ bool do_cmdline = false;
+ bool do_cwd = false;
+ bool do_exe = false;
+#ifdef HAVE_KINFO_GETFILE
+ bool do_files = false;
+#endif
+#ifdef HAVE_KINFO_GETVMMAP
+ bool do_mappings = false;
+#endif
+ bool do_status = false;
+
+ switch (what)
+ {
+ case IP_MINIMAL:
+ do_cmdline = true;
+ do_cwd = true;
+ do_exe = true;
+ break;
+#ifdef HAVE_KINFO_GETVMMAP
+ case IP_MAPPINGS:
+ do_mappings = true;
+ break;
+#endif
+ case IP_STATUS:
+ case IP_STAT:
+ do_status = true;
+ break;
+ case IP_CMDLINE:
+ do_cmdline = true;
+ break;
+ case IP_EXE:
+ do_exe = true;
+ break;
+ case IP_CWD:
+ do_cwd = true;
+ break;
+#ifdef HAVE_KINFO_GETFILE
+ case IP_FILES:
+ do_files = true;
+ break;
+#endif
+ case IP_ALL:
+ do_cmdline = true;
+ do_cwd = true;
+ do_exe = true;
+#ifdef HAVE_KINFO_GETFILE
+ do_files = true;
+#endif
+#ifdef HAVE_KINFO_GETVMMAP
+ do_mappings = true;
+#endif
+ do_status = true;
+ break;
+ default:
+ error (_("Not supported on this target."));
+ }
+
+ gdb_argv built_argv (args);
+ if (built_argv.count () == 0)
+ {
+ pid = inferior_ptid.pid ();
+ if (pid == 0)
+ error (_("No current process: you must name one."));
+ }
+ else if (built_argv.count () == 1 && isdigit (built_argv[0][0]))
+ pid = strtol (built_argv[0], NULL, 10);
+ else
+ error (_("Invalid arguments."));
+
+ printf_filtered (_("process %d\n"), pid);
+#ifdef HAVE_KINFO_GETFILE
+ if (do_cwd || do_exe || do_files)
+ fdtbl.reset (kinfo_getfile (pid, &nfd));
+#endif
+
+ if (do_cmdline)
+ {
+ gdb::unique_xmalloc_ptr<char> cmdline = fbsd_fetch_cmdline (pid);
+ if (cmdline != nullptr)
+ printf_filtered ("cmdline = '%s'\n", cmdline.get ());
+ else
+ warning (_("unable to fetch command line"));
+ }
+ if (do_cwd)
+ {
+ const char *cwd = NULL;
+#ifdef HAVE_KINFO_GETFILE
+ struct kinfo_file *kf = fdtbl.get ();
+ for (int i = 0; i < nfd; i++, kf++)
+ {
+ if (kf->kf_type == KF_TYPE_VNODE && kf->kf_fd == KF_FD_TYPE_CWD)
+ {
+ cwd = kf->kf_path;
+ break;
+ }
+ }
+#endif
+ if (cwd != NULL)
+ printf_filtered ("cwd = '%s'\n", cwd);
+ else
+ warning (_("unable to fetch current working directory"));
+ }
+ if (do_exe)
+ {
+ const char *exe = NULL;
+#ifdef HAVE_KINFO_GETFILE
+ struct kinfo_file *kf = fdtbl.get ();
+ for (int i = 0; i < nfd; i++, kf++)
+ {
+ if (kf->kf_type == KF_TYPE_VNODE && kf->kf_fd == KF_FD_TYPE_TEXT)
+ {
+ exe = kf->kf_path;
+ break;
+ }
+ }
+#endif
+ if (exe == NULL)
+ exe = pid_to_exec_file (pid);
+ if (exe != NULL)
+ printf_filtered ("exe = '%s'\n", exe);
+ else
+ warning (_("unable to fetch executable path name"));
+ }
+#ifdef HAVE_KINFO_GETFILE
+ if (do_files)
+ {
+ struct kinfo_file *kf = fdtbl.get ();
+
+ if (nfd > 0)
+ {
+ fbsd_info_proc_files_header ();
+ for (int i = 0; i < nfd; i++, kf++)
+ fbsd_info_proc_files_entry (kf->kf_type, kf->kf_fd, kf->kf_flags,
+ kf->kf_offset, kf->kf_vnode_type,
+ kf->kf_sock_domain, kf->kf_sock_type,
+ kf->kf_sock_protocol, &kf->kf_sa_local,
+ &kf->kf_sa_peer, kf->kf_path);
+ }
+ else
+ warning (_("unable to fetch list of open files"));
+ }
+#endif
+#ifdef HAVE_KINFO_GETVMMAP
+ if (do_mappings)
+ {
+ int nvment;
+ gdb::unique_xmalloc_ptr<struct kinfo_vmentry>
+ vmentl (kinfo_getvmmap (pid, &nvment));
+
+ if (vmentl != nullptr)
+ {
+ int addr_bit = TARGET_CHAR_BIT * sizeof (void *);
+ fbsd_info_proc_mappings_header (addr_bit);
+
+ struct kinfo_vmentry *kve = vmentl.get ();
+ for (int i = 0; i < nvment; i++, kve++)
+ fbsd_info_proc_mappings_entry (addr_bit, kve->kve_start,
+ kve->kve_end, kve->kve_offset,
+ kve->kve_flags, kve->kve_protection,
+ kve->kve_path);
+ }
+ else
+ warning (_("unable to fetch virtual memory map"));
+ }
+#endif
+ if (do_status)
+ {
+ if (!fbsd_fetch_kinfo_proc (pid, &kp))
+ warning (_("Failed to fetch process information"));
+ else
+ {
+ const char *state;
+ int pgtok;
+
+ printf_filtered ("Name: %s\n", kp.ki_comm);
+ switch (kp.ki_stat)
+ {
+ case SIDL:
+ state = "I (idle)";
+ break;
+ case SRUN:
+ state = "R (running)";
+ break;
+ case SSTOP:
+ state = "T (stopped)";
+ break;
+ case SZOMB:
+ state = "Z (zombie)";
+ break;
+ case SSLEEP:
+ state = "S (sleeping)";
+ break;
+ case SWAIT:
+ state = "W (interrupt wait)";
+ break;
+ case SLOCK:
+ state = "L (blocked on lock)";
+ break;
+ default:
+ state = "? (unknown)";
+ break;
+ }
+ printf_filtered ("State: %s\n", state);
+ printf_filtered ("Parent process: %d\n", kp.ki_ppid);
+ printf_filtered ("Process group: %d\n", kp.ki_pgid);
+ printf_filtered ("Session id: %d\n", kp.ki_sid);
+ printf_filtered ("TTY: %ju\n", (uintmax_t) kp.ki_tdev);
+ printf_filtered ("TTY owner process group: %d\n", kp.ki_tpgid);
+ printf_filtered ("User IDs (real, effective, saved): %d %d %d\n",
+ kp.ki_ruid, kp.ki_uid, kp.ki_svuid);
+ printf_filtered ("Group IDs (real, effective, saved): %d %d %d\n",
+ kp.ki_rgid, kp.ki_groups[0], kp.ki_svgid);
+ printf_filtered ("Groups: ");
+ for (int i = 0; i < kp.ki_ngroups; i++)
+ printf_filtered ("%d ", kp.ki_groups[i]);
+ printf_filtered ("\n");
+ printf_filtered ("Minor faults (no memory page): %ld\n",
+ kp.ki_rusage.ru_minflt);
+ printf_filtered ("Minor faults, children: %ld\n",
+ kp.ki_rusage_ch.ru_minflt);
+ printf_filtered ("Major faults (memory page faults): %ld\n",
+ kp.ki_rusage.ru_majflt);
+ printf_filtered ("Major faults, children: %ld\n",
+ kp.ki_rusage_ch.ru_majflt);
+ printf_filtered ("utime: %jd.%06ld\n",
+ (intmax_t) kp.ki_rusage.ru_utime.tv_sec,
+ kp.ki_rusage.ru_utime.tv_usec);
+ printf_filtered ("stime: %jd.%06ld\n",
+ (intmax_t) kp.ki_rusage.ru_stime.tv_sec,
+ kp.ki_rusage.ru_stime.tv_usec);
+ printf_filtered ("utime, children: %jd.%06ld\n",
+ (intmax_t) kp.ki_rusage_ch.ru_utime.tv_sec,
+ kp.ki_rusage_ch.ru_utime.tv_usec);
+ printf_filtered ("stime, children: %jd.%06ld\n",
+ (intmax_t) kp.ki_rusage_ch.ru_stime.tv_sec,
+ kp.ki_rusage_ch.ru_stime.tv_usec);
+ printf_filtered ("'nice' value: %d\n", kp.ki_nice);
+ printf_filtered ("Start time: %jd.%06ld\n", kp.ki_start.tv_sec,
+ kp.ki_start.tv_usec);
+ pgtok = getpagesize () / 1024;
+ printf_filtered ("Virtual memory size: %ju kB\n",
+ (uintmax_t) kp.ki_size / 1024);
+ printf_filtered ("Data size: %ju kB\n",
+ (uintmax_t) kp.ki_dsize * pgtok);
+ printf_filtered ("Stack size: %ju kB\n",
+ (uintmax_t) kp.ki_ssize * pgtok);
+ printf_filtered ("Text size: %ju kB\n",
+ (uintmax_t) kp.ki_tsize * pgtok);
+ printf_filtered ("Resident set size: %ju kB\n",
+ (uintmax_t) kp.ki_rssize * pgtok);
+ printf_filtered ("Maximum RSS: %ju kB\n",
+ (uintmax_t) kp.ki_rusage.ru_maxrss);
+ printf_filtered ("Pending Signals: ");
+ for (int i = 0; i < _SIG_WORDS; i++)
+ printf_filtered ("%08x ", kp.ki_siglist.__bits[i]);
+ printf_filtered ("\n");
+ printf_filtered ("Ignored Signals: ");
+ for (int i = 0; i < _SIG_WORDS; i++)
+ printf_filtered ("%08x ", kp.ki_sigignore.__bits[i]);
+ printf_filtered ("\n");
+ printf_filtered ("Caught Signals: ");
+ for (int i = 0; i < _SIG_WORDS; i++)
+ printf_filtered ("%08x ", kp.ki_sigcatch.__bits[i]);
+ printf_filtered ("\n");
+ }
+ }
+
+ return true;
+}
+
+/*
+ * The current layout of siginfo_t on FreeBSD was adopted in SVN
+ * revision 153154 which shipped in FreeBSD versions 7.0 and later.
+ * Don't bother supporting the older layout on older kernels. The
+ * older format was also never used in core dump notes.
+ */
+#if __FreeBSD_version >= 700009
+#define USE_SIGINFO
+#endif
+
+#ifdef USE_SIGINFO
+/* Return the size of siginfo for the current inferior. */
+
+#ifdef __LP64__
+union sigval32 {
+ int sival_int;
+ uint32_t sival_ptr;
+};
+
+/* This structure matches the naming and layout of `siginfo_t' in
+ <sys/signal.h>. In particular, the `si_foo' macros defined in that
+ header can be used with both types to copy fields in the `_reason'
+ union. */
+
+struct siginfo32
+{
+ int si_signo;
+ int si_errno;
+ int si_code;
+ __pid_t si_pid;
+ __uid_t si_uid;
+ int si_status;
+ uint32_t si_addr;
+ union sigval32 si_value;
+ union
+ {
+ struct
+ {
+ int _trapno;
+ } _fault;
+ struct
+ {
+ int _timerid;
+ int _overrun;
+ } _timer;
+ struct
+ {
+ int _mqd;
+ } _mesgq;
+ struct
+ {
+ int32_t _band;
+ } _poll;
+ struct
+ {
+ int32_t __spare1__;
+ int __spare2__[7];
+ } __spare__;
+ } _reason;
+};
+#endif
+
+static size_t
+fbsd_siginfo_size ()
+{
+#ifdef __LP64__
+ struct gdbarch *gdbarch = get_frame_arch (get_current_frame ());
+
+ /* Is the inferior 32-bit? If so, use the 32-bit siginfo size. */
+ if (gdbarch_long_bit (gdbarch) == 32)
+ return sizeof (struct siginfo32);
+#endif
+ return sizeof (siginfo_t);
+}
+
+/* Convert a native 64-bit siginfo object to a 32-bit object. Note
+ that FreeBSD doesn't support writing to $_siginfo, so this only
+ needs to convert one way. */
+
+static void
+fbsd_convert_siginfo (siginfo_t *si)
+{
+#ifdef __LP64__
+ struct gdbarch *gdbarch = get_frame_arch (get_current_frame ());
+
+ /* Is the inferior 32-bit? If not, nothing to do. */
+ if (gdbarch_long_bit (gdbarch) != 32)
+ return;
+
+ struct siginfo32 si32;
+
+ si32.si_signo = si->si_signo;
+ si32.si_errno = si->si_errno;
+ si32.si_code = si->si_code;
+ si32.si_pid = si->si_pid;
+ si32.si_uid = si->si_uid;
+ si32.si_status = si->si_status;
+ si32.si_addr = (uintptr_t) si->si_addr;
+
+ /* If sival_ptr is being used instead of sival_int on a big-endian
+ platform, then sival_int will be zero since it holds the upper
+ 32-bits of the pointer value. */
+#if _BYTE_ORDER == _BIG_ENDIAN
+ if (si->si_value.sival_int == 0)
+ si32.si_value.sival_ptr = (uintptr_t) si->si_value.sival_ptr;
+ else
+ si32.si_value.sival_int = si->si_value.sival_int;
+#else
+ si32.si_value.sival_int = si->si_value.sival_int;
+#endif
+
+ /* Always copy the spare fields and then possibly overwrite them for
+ signal-specific or code-specific fields. */
+ si32._reason.__spare__.__spare1__ = si->_reason.__spare__.__spare1__;
+ for (int i = 0; i < 7; i++)
+ si32._reason.__spare__.__spare2__[i] = si->_reason.__spare__.__spare2__[i];
+ switch (si->si_signo) {
+ case SIGILL:
+ case SIGFPE:
+ case SIGSEGV:
+ case SIGBUS:
+ si32.si_trapno = si->si_trapno;
+ break;
+ }
+ switch (si->si_code) {
+ case SI_TIMER:
+ si32.si_timerid = si->si_timerid;
+ si32.si_overrun = si->si_overrun;
+ break;
+ case SI_MESGQ:
+ si32.si_mqd = si->si_mqd;
+ break;
+ }
+
+ memcpy(si, &si32, sizeof (si32));
+#endif
+}
+#endif
+
+/* Implement the "xfer_partial" target_ops method. */
+
+enum target_xfer_status
+fbsd_nat_target::xfer_partial (enum target_object object,
+ const char *annex, gdb_byte *readbuf,
+ const gdb_byte *writebuf,
+ ULONGEST offset, ULONGEST len,
+ ULONGEST *xfered_len)
+{
+ pid_t pid = inferior_ptid.pid ();
+
+ switch (object)
+ {
+#ifdef USE_SIGINFO
+ case TARGET_OBJECT_SIGNAL_INFO:
+ {
+ struct ptrace_lwpinfo pl;
+ size_t siginfo_size;
+
+ /* FreeBSD doesn't support writing to $_siginfo. */
+ if (writebuf != NULL)
+ return TARGET_XFER_E_IO;
+
+ if (inferior_ptid.lwp_p ())
+ pid = inferior_ptid.lwp ();
+
+ siginfo_size = fbsd_siginfo_size ();
+ if (offset > siginfo_size)
+ return TARGET_XFER_E_IO;
+
+ if (ptrace (PT_LWPINFO, pid, (PTRACE_TYPE_ARG3) &pl, sizeof (pl)) == -1)
+ return TARGET_XFER_E_IO;
+
+ if (!(pl.pl_flags & PL_FLAG_SI))
+ return TARGET_XFER_E_IO;
+
+ fbsd_convert_siginfo (&pl.pl_siginfo);
+ if (offset + len > siginfo_size)
+ len = siginfo_size - offset;
+
+ memcpy (readbuf, ((gdb_byte *) &pl.pl_siginfo) + offset, len);
+ *xfered_len = len;
+ return TARGET_XFER_OK;
+ }
+#endif
+#ifdef KERN_PROC_AUXV
+ case TARGET_OBJECT_AUXV:
+ {
+ gdb::byte_vector buf_storage;
+ gdb_byte *buf;
+ size_t buflen;
+ int mib[4];
+
+ if (writebuf != NULL)
+ return TARGET_XFER_E_IO;
+ mib[0] = CTL_KERN;
+ mib[1] = KERN_PROC;
+ mib[2] = KERN_PROC_AUXV;
+ mib[3] = pid;
+ if (offset == 0)
+ {
+ buf = readbuf;
+ buflen = len;
+ }
+ else
+ {
+ buflen = offset + len;
+ buf_storage.resize (buflen);
+ buf = buf_storage.data ();
+ }
+ if (sysctl (mib, 4, buf, &buflen, NULL, 0) == 0)
+ {
+ if (offset != 0)
+ {
+ if (buflen > offset)
+ {
+ buflen -= offset;
+ memcpy (readbuf, buf + offset, buflen);
+ }
+ else
+ buflen = 0;
+ }
+ *xfered_len = buflen;
+ return (buflen == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK;
+ }
+ return TARGET_XFER_E_IO;
+ }
+#endif
+#if defined(KERN_PROC_VMMAP) && defined(KERN_PROC_PS_STRINGS)
+ case TARGET_OBJECT_FREEBSD_VMMAP:
+ case TARGET_OBJECT_FREEBSD_PS_STRINGS:
+ {
+ gdb::byte_vector buf_storage;
+ gdb_byte *buf;
+ size_t buflen;
+ int mib[4];
+
+ int proc_target;
+ uint32_t struct_size;
+ switch (object)
+ {
+ case TARGET_OBJECT_FREEBSD_VMMAP:
+ proc_target = KERN_PROC_VMMAP;
+ struct_size = sizeof (struct kinfo_vmentry);
+ break;
+ case TARGET_OBJECT_FREEBSD_PS_STRINGS:
+ proc_target = KERN_PROC_PS_STRINGS;
+ struct_size = sizeof (void *);
+ break;
+ }
+
+ if (writebuf != NULL)
+ return TARGET_XFER_E_IO;
+
+ mib[0] = CTL_KERN;
+ mib[1] = KERN_PROC;
+ mib[2] = proc_target;
+ mib[3] = pid;
+
+ if (sysctl (mib, 4, NULL, &buflen, NULL, 0) != 0)
+ return TARGET_XFER_E_IO;
+ buflen += sizeof (struct_size);
+
+ if (offset >= buflen)
+ {
+ *xfered_len = 0;
+ return TARGET_XFER_EOF;
+ }
+
+ buf_storage.resize (buflen);
+ buf = buf_storage.data ();
+
+ memcpy (buf, &struct_size, sizeof (struct_size));
+ buflen -= sizeof (struct_size);
+ if (sysctl (mib, 4, buf + sizeof (struct_size), &buflen, NULL, 0) != 0)
+ return TARGET_XFER_E_IO;
+ buflen += sizeof (struct_size);
+
+ if (buflen - offset < len)
+ len = buflen - offset;
+ memcpy (readbuf, buf + offset, len);
+ *xfered_len = len;
+ return TARGET_XFER_OK;
+ }
+#endif
+ default:
+ return inf_ptrace_target::xfer_partial (object, annex,
+ readbuf, writebuf, offset,
+ len, xfered_len);
+ }
+}
+
+#ifdef PT_LWPINFO
+static bool debug_fbsd_lwp;
+static bool debug_fbsd_nat;
+
+static void
+show_fbsd_lwp_debug (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("Debugging of FreeBSD lwp module is %s.\n"), value);
+}
+
+static void
+show_fbsd_nat_debug (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("Debugging of FreeBSD native target is %s.\n"),
+ value);
+}
+
+/*
+ FreeBSD's first thread support was via a "reentrant" version of libc
+ (libc_r) that first shipped in 2.2.7. This library multiplexed all
+ of the threads in a process onto a single kernel thread. This
+ library was supported via the bsd-uthread target.
+
+ FreeBSD 5.1 introduced two new threading libraries that made use of
+ multiple kernel threads. The first (libkse) scheduled M user
+ threads onto N (<= M) kernel threads (LWPs). The second (libthr)
+ bound each user thread to a dedicated kernel thread. libkse shipped
+ as the default threading library (libpthread).
+
+ FreeBSD 5.3 added a libthread_db to abstract the interface across
+ the various thread libraries (libc_r, libkse, and libthr).
+
+ FreeBSD 7.0 switched the default threading library from from libkse
+ to libpthread and removed libc_r.
+
+ FreeBSD 8.0 removed libkse and the in-kernel support for it. The
+ only threading library supported by 8.0 and later is libthr which
+ ties each user thread directly to an LWP. To simplify the
+ implementation, this target only supports LWP-backed threads using
+ ptrace directly rather than libthread_db.
+
+ FreeBSD 11.0 introduced LWP event reporting via PT_LWP_EVENTS.
+*/
+
+/* Return true if PTID is still active in the inferior. */
+
+bool
+fbsd_nat_target::thread_alive (ptid_t ptid)
+{
+ if (ptid.lwp_p ())
+ {
+ struct ptrace_lwpinfo pl;
+
+ if (ptrace (PT_LWPINFO, ptid.lwp (), (caddr_t) &pl, sizeof pl)
+ == -1)
+ return false;
+#ifdef PL_FLAG_EXITED
+ if (pl.pl_flags & PL_FLAG_EXITED)
+ return false;
+#endif
+ }
+
+ return true;
+}
+
+/* Convert PTID to a string. */
+
+std::string
+fbsd_nat_target::pid_to_str (ptid_t ptid)
+{
+ lwpid_t lwp;
+
+ lwp = ptid.lwp ();
+ if (lwp != 0)
+ {
+ int pid = ptid.pid ();
+
+ return string_printf ("LWP %d of process %d", lwp, pid);
+ }
+
+ return normal_pid_to_str (ptid);
+}
+
+#ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME
+/* Return the name assigned to a thread by an application. Returns
+ the string in a static buffer. */
+
+const char *
+fbsd_nat_target::thread_name (struct thread_info *thr)
+{
+ struct ptrace_lwpinfo pl;
+ struct kinfo_proc kp;
+ int pid = thr->ptid.pid ();
+ long lwp = thr->ptid.lwp ();
+ static char buf[sizeof pl.pl_tdname + 1];
+
+ /* Note that ptrace_lwpinfo returns the process command in pl_tdname
+ if a name has not been set explicitly. Return a NULL name in
+ that case. */
+ if (!fbsd_fetch_kinfo_proc (pid, &kp))
+ perror_with_name (_("Failed to fetch process information"));
+ if (ptrace (PT_LWPINFO, lwp, (caddr_t) &pl, sizeof pl) == -1)
+ perror_with_name (("ptrace"));
+ if (strcmp (kp.ki_comm, pl.pl_tdname) == 0)
+ return NULL;
+ xsnprintf (buf, sizeof buf, "%s", pl.pl_tdname);
+ return buf;
+}
+#endif
+
+/* Enable additional event reporting on new processes.
+
+ To catch fork events, PTRACE_FORK is set on every traced process
+ to enable stops on returns from fork or vfork. Note that both the
+ parent and child will always stop, even if system call stops are
+ not enabled.
+
+ To catch LWP events, PTRACE_EVENTS is set on every traced process.
+ This enables stops on the birth for new LWPs (excluding the "main" LWP)
+ and the death of LWPs (excluding the last LWP in a process). Note
+ that unlike fork events, the LWP that creates a new LWP does not
+ report an event. */
+
+static void
+fbsd_enable_proc_events (pid_t pid)
+{
+#ifdef PT_GET_EVENT_MASK
+ int events;
+
+ if (ptrace (PT_GET_EVENT_MASK, pid, (PTRACE_TYPE_ARG3)&events,
+ sizeof (events)) == -1)
+ perror_with_name (("ptrace"));
+ events |= PTRACE_FORK | PTRACE_LWP;
+#ifdef PTRACE_VFORK
+ events |= PTRACE_VFORK;
+#endif
+ if (ptrace (PT_SET_EVENT_MASK, pid, (PTRACE_TYPE_ARG3)&events,
+ sizeof (events)) == -1)
+ perror_with_name (("ptrace"));
+#else
+#ifdef TDP_RFPPWAIT
+ if (ptrace (PT_FOLLOW_FORK, pid, (PTRACE_TYPE_ARG3)0, 1) == -1)
+ perror_with_name (("ptrace"));
+#endif
+#ifdef PT_LWP_EVENTS
+ if (ptrace (PT_LWP_EVENTS, pid, (PTRACE_TYPE_ARG3)0, 1) == -1)
+ perror_with_name (("ptrace"));
+#endif
+#endif
+}
+
+/* Add threads for any new LWPs in a process.
+
+ When LWP events are used, this function is only used to detect existing
+ threads when attaching to a process. On older systems, this function is
+ called to discover new threads each time the thread list is updated. */
+
+static void
+fbsd_add_threads (fbsd_nat_target *target, pid_t pid)
+{
+ int i, nlwps;
+
+ gdb_assert (!in_thread_list (target, ptid_t (pid)));
+ nlwps = ptrace (PT_GETNUMLWPS, pid, NULL, 0);
+ if (nlwps == -1)
+ perror_with_name (("ptrace"));
+
+ gdb::unique_xmalloc_ptr<lwpid_t[]> lwps (XCNEWVEC (lwpid_t, nlwps));
+
+ nlwps = ptrace (PT_GETLWPLIST, pid, (caddr_t) lwps.get (), nlwps);
+ if (nlwps == -1)
+ perror_with_name (("ptrace"));
+
+ for (i = 0; i < nlwps; i++)
+ {
+ ptid_t ptid = ptid_t (pid, lwps[i], 0);
+
+ if (!in_thread_list (target, ptid))
+ {
+#ifdef PT_LWP_EVENTS
+ struct ptrace_lwpinfo pl;
+
+ /* Don't add exited threads. Note that this is only called
+ when attaching to a multi-threaded process. */
+ if (ptrace (PT_LWPINFO, lwps[i], (caddr_t) &pl, sizeof pl) == -1)
+ perror_with_name (("ptrace"));
+ if (pl.pl_flags & PL_FLAG_EXITED)
+ continue;
+#endif
+ if (debug_fbsd_lwp)
+ fprintf_unfiltered (gdb_stdlog,
+ "FLWP: adding thread for LWP %u\n",
+ lwps[i]);
+ add_thread (target, ptid);
+ }
+ }
+}
+
+/* Implement the "update_thread_list" target_ops method. */
+
+void
+fbsd_nat_target::update_thread_list ()
{
- if (info->suspend.stop_signal != TARGET_SIGNAL_0
- && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid))
- return 1;
+#ifdef PT_LWP_EVENTS
+ /* With support for thread events, threads are added/deleted from the
+ list as events are reported, so just try deleting exited threads. */
+ delete_exited_threads ();
+#else
+ prune_threads ();
+
+ fbsd_add_threads (this, inferior_ptid.pid ());
+#endif
+}
+#ifdef TDP_RFPPWAIT
+/*
+ To catch fork events, PT_FOLLOW_FORK is set on every traced process
+ to enable stops on returns from fork or vfork. Note that both the
+ parent and child will always stop, even if system call stops are not
+ enabled.
+
+ After a fork, both the child and parent process will stop and report
+ an event. However, there is no guarantee of order. If the parent
+ reports its stop first, then fbsd_wait explicitly waits for the new
+ child before returning. If the child reports its stop first, then
+ the event is saved on a list and ignored until the parent's stop is
+ reported. fbsd_wait could have been changed to fetch the parent PID
+ of the new child and used that to wait for the parent explicitly.
+ However, if two threads in the parent fork at the same time, then
+ the wait on the parent might return the "wrong" fork event.
+
+ The initial version of PT_FOLLOW_FORK did not set PL_FLAG_CHILD for
+ the new child process. This flag could be inferred by treating any
+ events for an unknown pid as a new child.
+
+ In addition, the initial version of PT_FOLLOW_FORK did not report a
+ stop event for the parent process of a vfork until after the child
+ process executed a new program or exited. The kernel was changed to
+ defer the wait for exit or exec of the child until after posting the
+ stop event shortly after the change to introduce PL_FLAG_CHILD.
+ This could be worked around by reporting a vfork event when the
+ child event posted and ignoring the subsequent event from the
+ parent.
+
+ This implementation requires both of these fixes for simplicity's
+ sake. FreeBSD versions newer than 9.1 contain both fixes.
+*/
+
+static std::list<ptid_t> fbsd_pending_children;
+
+/* Record a new child process event that is reported before the
+ corresponding fork event in the parent. */
+
+static void
+fbsd_remember_child (ptid_t pid)
+{
+ fbsd_pending_children.push_front (pid);
+}
+
+/* Check for a previously-recorded new child process event for PID.
+ If one is found, remove it from the list and return the PTID. */
+
+static ptid_t
+fbsd_is_child_pending (pid_t pid)
+{
+ for (auto it = fbsd_pending_children.begin ();
+ it != fbsd_pending_children.end (); it++)
+ if (it->pid () == pid)
+ {
+ ptid_t ptid = *it;
+ fbsd_pending_children.erase (it);
+ return ptid;
+ }
+ return null_ptid;
+}
+
+#ifndef PTRACE_VFORK
+static std::forward_list<ptid_t> fbsd_pending_vfork_done;
+
+/* Record a pending vfork done event. */
+
+static void
+fbsd_add_vfork_done (ptid_t pid)
+{
+ fbsd_pending_vfork_done.push_front (pid);
+}
+
+/* Check for a pending vfork done event for a specific PID. */
+
+static int
+fbsd_is_vfork_done_pending (pid_t pid)
+{
+ for (auto it = fbsd_pending_vfork_done.begin ();
+ it != fbsd_pending_vfork_done.end (); it++)
+ if (it->pid () == pid)
+ return 1;
return 0;
}
-static enum target_signal
-find_stop_signal (void)
+/* Check for a pending vfork done event. If one is found, remove it
+ from the list and return the PTID. */
+
+static ptid_t
+fbsd_next_vfork_done (void)
{
- struct thread_info *info =
- iterate_over_threads (find_signalled_thread, NULL);
+ if (!fbsd_pending_vfork_done.empty ())
+ {
+ ptid_t ptid = fbsd_pending_vfork_done.front ();
+ fbsd_pending_vfork_done.pop_front ();
+ return ptid;
+ }
+ return null_ptid;
+}
+#endif
+#endif
+
+/* Implement the "resume" target_ops method. */
- if (info)
- return info->suspend.stop_signal;
+void
+fbsd_nat_target::resume (ptid_t ptid, int step, enum gdb_signal signo)
+{
+#if defined(TDP_RFPPWAIT) && !defined(PTRACE_VFORK)
+ pid_t pid;
+
+ /* Don't PT_CONTINUE a process which has a pending vfork done event. */
+ if (minus_one_ptid == ptid)
+ pid = inferior_ptid.pid ();
else
- return TARGET_SIGNAL_0;
+ pid = ptid.pid ();
+ if (fbsd_is_vfork_done_pending (pid))
+ return;
+#endif
+
+ if (debug_fbsd_lwp)
+ fprintf_unfiltered (gdb_stdlog,
+ "FLWP: fbsd_resume for ptid (%d, %ld, %ld)\n",
+ ptid.pid (), ptid.lwp (),
+ ptid.tid ());
+ if (ptid.lwp_p ())
+ {
+ /* If ptid is a specific LWP, suspend all other LWPs in the process. */
+ inferior *inf = find_inferior_ptid (this, ptid);
+
+ for (thread_info *tp : inf->non_exited_threads ())
+ {
+ int request;
+
+ if (tp->ptid.lwp () == ptid.lwp ())
+ request = PT_RESUME;
+ else
+ request = PT_SUSPEND;
+
+ if (ptrace (request, tp->ptid.lwp (), NULL, 0) == -1)
+ perror_with_name (("ptrace"));
+ }
+ }
+ else
+ {
+ /* If ptid is a wildcard, resume all matching threads (they won't run
+ until the process is continued however). */
+ for (thread_info *tp : all_non_exited_threads (this, ptid))
+ if (ptrace (PT_RESUME, tp->ptid.lwp (), NULL, 0) == -1)
+ perror_with_name (("ptrace"));
+ ptid = inferior_ptid;
+ }
+
+#if __FreeBSD_version < 1200052
+ /* When multiple threads within a process wish to report STOPPED
+ events from wait(), the kernel picks one thread event as the
+ thread event to report. The chosen thread event is retrieved via
+ PT_LWPINFO by passing the process ID as the request pid. If
+ multiple events are pending, then the subsequent wait() after
+ resuming a process will report another STOPPED event after
+ resuming the process to handle the next thread event and so on.
+
+ A single thread event is cleared as a side effect of resuming the
+ process with PT_CONTINUE, PT_STEP, etc. In older kernels,
+ however, the request pid was used to select which thread's event
+ was cleared rather than always clearing the event that was just
+ reported. To avoid clearing the event of the wrong LWP, always
+ pass the process ID instead of an LWP ID to PT_CONTINUE or
+ PT_SYSCALL.
+
+ In the case of stepping, the process ID cannot be used with
+ PT_STEP since it would step the thread that reported an event
+ which may not be the thread indicated by PTID. For stepping, use
+ PT_SETSTEP to enable stepping on the desired thread before
+ resuming the process via PT_CONTINUE instead of using
+ PT_STEP. */
+ if (step)
+ {
+ if (ptrace (PT_SETSTEP, get_ptrace_pid (ptid), NULL, 0) == -1)
+ perror_with_name (("ptrace"));
+ step = 0;
+ }
+ ptid = ptid_t (ptid.pid ());
+#endif
+ inf_ptrace_target::resume (ptid, step, signo);
}
-/* Create appropriate note sections for a corefile, returning them in
- allocated memory. */
+#ifdef USE_SIGTRAP_SIGINFO
+/* Handle breakpoint and trace traps reported via SIGTRAP. If the
+ trap was a breakpoint or trace trap that should be reported to the
+ core, return true. */
-char *
-fbsd_make_corefile_notes (bfd *obfd, int *note_size)
+static bool
+fbsd_handle_debug_trap (fbsd_nat_target *target, ptid_t ptid,
+ const struct ptrace_lwpinfo &pl)
+{
+
+ /* Ignore traps without valid siginfo or for signals other than
+ SIGTRAP.
+
+ FreeBSD kernels prior to r341800 can return stale siginfo for at
+ least some events, but those events can be identified by
+ additional flags set in pl_flags. True breakpoint and
+ single-step traps should not have other flags set in
+ pl_flags. */
+ if (pl.pl_flags != PL_FLAG_SI || pl.pl_siginfo.si_signo != SIGTRAP)
+ return false;
+
+ /* Trace traps are either a single step or a hardware watchpoint or
+ breakpoint. */
+ if (pl.pl_siginfo.si_code == TRAP_TRACE)
+ {
+ if (debug_fbsd_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "FNAT: trace trap for LWP %ld\n", ptid.lwp ());
+ return true;
+ }
+
+ if (pl.pl_siginfo.si_code == TRAP_BRKPT)
+ {
+ /* Fixup PC for the software breakpoint. */
+ struct regcache *regcache = get_thread_regcache (target, ptid);
+ struct gdbarch *gdbarch = regcache->arch ();
+ int decr_pc = gdbarch_decr_pc_after_break (gdbarch);
+
+ if (debug_fbsd_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "FNAT: sw breakpoint trap for LWP %ld\n",
+ ptid.lwp ());
+ if (decr_pc != 0)
+ {
+ CORE_ADDR pc;
+
+ pc = regcache_read_pc (regcache);
+ regcache_write_pc (regcache, pc - decr_pc);
+ }
+ return true;
+ }
+
+ return false;
+}
+#endif
+
+/* Wait for the child specified by PTID to do something. Return the
+ process ID of the child, or MINUS_ONE_PTID in case of error; store
+ the status in *OURSTATUS. */
+
+ptid_t
+fbsd_nat_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
+ int target_options)
{
- const struct regcache *regcache = get_current_regcache ();
- struct gdbarch *gdbarch = get_regcache_arch (regcache);
- gregset_t gregs;
- fpregset_t fpregs;
- char *note_data = NULL;
- Elf_Internal_Ehdr *i_ehdrp;
- const struct regset *regset;
- size_t size;
+ ptid_t wptid;
+
+ while (1)
+ {
+#ifndef PTRACE_VFORK
+ wptid = fbsd_next_vfork_done ();
+ if (wptid != null_ptid)
+ {
+ ourstatus->kind = TARGET_WAITKIND_VFORK_DONE;
+ return wptid;
+ }
+#endif
+ wptid = inf_ptrace_target::wait (ptid, ourstatus, target_options);
+ if (ourstatus->kind == TARGET_WAITKIND_STOPPED)
+ {
+ struct ptrace_lwpinfo pl;
+ pid_t pid;
+ int status;
+
+ pid = wptid.pid ();
+ if (ptrace (PT_LWPINFO, pid, (caddr_t) &pl, sizeof pl) == -1)
+ perror_with_name (("ptrace"));
+
+ wptid = ptid_t (pid, pl.pl_lwpid, 0);
- /* Put a "FreeBSD" label in the ELF header. */
- i_ehdrp = elf_elfheader (obfd);
- i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
+ if (debug_fbsd_nat)
+ {
+ fprintf_unfiltered (gdb_stdlog,
+ "FNAT: stop for LWP %u event %d flags %#x\n",
+ pl.pl_lwpid, pl.pl_event, pl.pl_flags);
+ if (pl.pl_flags & PL_FLAG_SI)
+ fprintf_unfiltered (gdb_stdlog,
+ "FNAT: si_signo %u si_code %u\n",
+ pl.pl_siginfo.si_signo,
+ pl.pl_siginfo.si_code);
+ }
- gdb_assert (gdbarch_regset_from_core_section_p (gdbarch));
+#ifdef PT_LWP_EVENTS
+ if (pl.pl_flags & PL_FLAG_EXITED)
+ {
+ /* If GDB attaches to a multi-threaded process, exiting
+ threads might be skipped during post_attach that
+ have not yet reported their PL_FLAG_EXITED event.
+ Ignore EXITED events for an unknown LWP. */
+ thread_info *thr = find_thread_ptid (this, wptid);
+ if (thr != nullptr)
+ {
+ if (debug_fbsd_lwp)
+ fprintf_unfiltered (gdb_stdlog,
+ "FLWP: deleting thread for LWP %u\n",
+ pl.pl_lwpid);
+ if (print_thread_events)
+ printf_unfiltered (_("[%s exited]\n"),
+ target_pid_to_str (wptid).c_str ());
+ delete_thread (thr);
+ }
+ if (ptrace (PT_CONTINUE, pid, (caddr_t) 1, 0) == -1)
+ perror_with_name (("ptrace"));
+ continue;
+ }
+#endif
+
+ /* Switch to an LWP PTID on the first stop in a new process.
+ This is done after handling PL_FLAG_EXITED to avoid
+ switching to an exited LWP. It is done before checking
+ PL_FLAG_BORN in case the first stop reported after
+ attaching to an existing process is a PL_FLAG_BORN
+ event. */
+ if (in_thread_list (this, ptid_t (pid)))
+ {
+ if (debug_fbsd_lwp)
+ fprintf_unfiltered (gdb_stdlog,
+ "FLWP: using LWP %u for first thread\n",
+ pl.pl_lwpid);
+ thread_change_ptid (this, ptid_t (pid), wptid);
+ }
+
+#ifdef PT_LWP_EVENTS
+ if (pl.pl_flags & PL_FLAG_BORN)
+ {
+ /* If GDB attaches to a multi-threaded process, newborn
+ threads might be added by fbsd_add_threads that have
+ not yet reported their PL_FLAG_BORN event. Ignore
+ BORN events for an already-known LWP. */
+ if (!in_thread_list (this, wptid))
+ {
+ if (debug_fbsd_lwp)
+ fprintf_unfiltered (gdb_stdlog,
+ "FLWP: adding thread for LWP %u\n",
+ pl.pl_lwpid);
+ add_thread (this, wptid);
+ }
+ ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
+ return wptid;
+ }
+#endif
+
+#ifdef TDP_RFPPWAIT
+ if (pl.pl_flags & PL_FLAG_FORKED)
+ {
+#ifndef PTRACE_VFORK
+ struct kinfo_proc kp;
+#endif
+ ptid_t child_ptid;
+ pid_t child;
+
+ child = pl.pl_child_pid;
+ ourstatus->kind = TARGET_WAITKIND_FORKED;
+#ifdef PTRACE_VFORK
+ if (pl.pl_flags & PL_FLAG_VFORKED)
+ ourstatus->kind = TARGET_WAITKIND_VFORKED;
+#endif
+
+ /* Make sure the other end of the fork is stopped too. */
+ child_ptid = fbsd_is_child_pending (child);
+ if (child_ptid == null_ptid)
+ {
+ pid = waitpid (child, &status, 0);
+ if (pid == -1)
+ perror_with_name (("waitpid"));
+
+ gdb_assert (pid == child);
+
+ if (ptrace (PT_LWPINFO, child, (caddr_t)&pl, sizeof pl) == -1)
+ perror_with_name (("ptrace"));
+
+ gdb_assert (pl.pl_flags & PL_FLAG_CHILD);
+ child_ptid = ptid_t (child, pl.pl_lwpid, 0);
+ }
+
+ /* Enable additional events on the child process. */
+ fbsd_enable_proc_events (child_ptid.pid ());
- size = sizeof gregs;
- regset = gdbarch_regset_from_core_section (gdbarch, ".reg", size);
- gdb_assert (regset && regset->collect_regset);
- regset->collect_regset (regset, regcache, -1, &gregs, size);
+#ifndef PTRACE_VFORK
+ /* For vfork, the child process will have the P_PPWAIT
+ flag set. */
+ if (fbsd_fetch_kinfo_proc (child, &kp))
+ {
+ if (kp.ki_flag & P_PPWAIT)
+ ourstatus->kind = TARGET_WAITKIND_VFORKED;
+ }
+ else
+ warning (_("Failed to fetch process information"));
+#endif
+ ourstatus->value.related_pid = child_ptid;
+
+ return wptid;
+ }
- note_data = elfcore_write_prstatus (obfd, note_data, note_size,
- ptid_get_pid (inferior_ptid),
- find_stop_signal (), &gregs);
+ if (pl.pl_flags & PL_FLAG_CHILD)
+ {
+ /* Remember that this child forked, but do not report it
+ until the parent reports its corresponding fork
+ event. */
+ fbsd_remember_child (wptid);
+ continue;
+ }
+
+#ifdef PTRACE_VFORK
+ if (pl.pl_flags & PL_FLAG_VFORK_DONE)
+ {
+ ourstatus->kind = TARGET_WAITKIND_VFORK_DONE;
+ return wptid;
+ }
+#endif
+#endif
+
+#ifdef PL_FLAG_EXEC
+ if (pl.pl_flags & PL_FLAG_EXEC)
+ {
+ ourstatus->kind = TARGET_WAITKIND_EXECD;
+ ourstatus->value.execd_pathname
+ = xstrdup (pid_to_exec_file (pid));
+ return wptid;
+ }
+#endif
- size = sizeof fpregs;
- regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", size);
- gdb_assert (regset && regset->collect_regset);
- regset->collect_regset (regset, regcache, -1, &fpregs, size);
+#ifdef USE_SIGTRAP_SIGINFO
+ if (fbsd_handle_debug_trap (this, wptid, pl))
+ return wptid;
+#endif
+
+ /* Note that PL_FLAG_SCE is set for any event reported while
+ a thread is executing a system call in the kernel. In
+ particular, signals that interrupt a sleep in a system
+ call will report this flag as part of their event. Stops
+ explicitly for system call entry and exit always use
+ SIGTRAP, so only treat SIGTRAP events as system call
+ entry/exit events. */
+ if (pl.pl_flags & (PL_FLAG_SCE | PL_FLAG_SCX)
+ && ourstatus->value.sig == SIGTRAP)
+ {
+#ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE
+ if (catch_syscall_enabled ())
+ {
+ if (catching_syscall_number (pl.pl_syscall_code))
+ {
+ if (pl.pl_flags & PL_FLAG_SCE)
+ ourstatus->kind = TARGET_WAITKIND_SYSCALL_ENTRY;
+ else
+ ourstatus->kind = TARGET_WAITKIND_SYSCALL_RETURN;
+ ourstatus->value.syscall_number = pl.pl_syscall_code;
+ return wptid;
+ }
+ }
+#endif
+ /* If the core isn't interested in this event, just
+ continue the process explicitly and wait for another
+ event. Note that PT_SYSCALL is "sticky" on FreeBSD
+ and once system call stops are enabled on a process
+ it stops for all system call entries and exits. */
+ if (ptrace (PT_CONTINUE, pid, (caddr_t) 1, 0) == -1)
+ perror_with_name (("ptrace"));
+ continue;
+ }
+ }
+ return wptid;
+ }
+}
- note_data = elfcore_write_prfpreg (obfd, note_data, note_size,
- &fpregs, sizeof (fpregs));
+#ifdef USE_SIGTRAP_SIGINFO
+/* Implement the "stopped_by_sw_breakpoint" target_ops method. */
- if (get_exec_file (0))
+bool
+fbsd_nat_target::stopped_by_sw_breakpoint ()
+{
+ struct ptrace_lwpinfo pl;
+
+ if (ptrace (PT_LWPINFO, get_ptrace_pid (inferior_ptid), (caddr_t) &pl,
+ sizeof pl) == -1)
+ return false;
+
+ return (pl.pl_flags == PL_FLAG_SI
+ && pl.pl_siginfo.si_signo == SIGTRAP
+ && pl.pl_siginfo.si_code == TRAP_BRKPT);
+}
+
+/* Implement the "supports_stopped_by_sw_breakpoint" target_ops
+ method. */
+
+bool
+fbsd_nat_target::supports_stopped_by_sw_breakpoint ()
+{
+ return true;
+}
+#endif
+
+#ifdef TDP_RFPPWAIT
+/* Target hook for follow_fork. On entry and at return inferior_ptid is
+ the ptid of the followed inferior. */
+
+int
+fbsd_nat_target::follow_fork (int follow_child, int detach_fork)
+{
+ if (!follow_child && detach_fork)
{
- char *fname = strrchr (get_exec_file (0), '/') + 1;
- char *psargs = xstrdup (fname);
+ struct thread_info *tp = inferior_thread ();
+ pid_t child_pid = tp->pending_follow.value.related_pid.pid ();
- if (get_inferior_args ())
- psargs = reconcat (psargs, psargs, " ", get_inferior_args (),
- (char *) NULL);
+ /* Breakpoints have already been detached from the child by
+ infrun.c. */
- note_data = elfcore_write_prpsinfo (obfd, note_data, note_size,
- fname, psargs);
+ if (ptrace (PT_DETACH, child_pid, (PTRACE_TYPE_ARG3)1, 0) == -1)
+ perror_with_name (("ptrace"));
+
+#ifndef PTRACE_VFORK
+ if (tp->pending_follow.kind == TARGET_WAITKIND_VFORKED)
+ {
+ /* We can't insert breakpoints until the child process has
+ finished with the shared memory region. The parent
+ process doesn't wait for the child process to exit or
+ exec until after it has been resumed from the ptrace stop
+ to report the fork. Once it has been resumed it doesn't
+ stop again before returning to userland, so there is no
+ reliable way to wait on the parent.
+
+ We can't stay attached to the child to wait for an exec
+ or exit because it may invoke ptrace(PT_TRACE_ME)
+ (e.g. if the parent process is a debugger forking a new
+ child process).
+
+ In the end, the best we can do is to make sure it runs
+ for a little while. Hopefully it will be out of range of
+ any breakpoints we reinsert. Usually this is only the
+ single-step breakpoint at vfork's return point. */
+
+ usleep (10000);
+
+ /* Schedule a fake VFORK_DONE event to report on the next
+ wait. */
+ fbsd_add_vfork_done (inferior_ptid);
+ }
+#endif
}
- make_cleanup (xfree, note_data);
- return note_data;
+ return 0;
+}
+
+int
+fbsd_nat_target::insert_fork_catchpoint (int pid)
+{
+ return 0;
+}
+
+int
+fbsd_nat_target::remove_fork_catchpoint (int pid)
+{
+ return 0;
+}
+
+int
+fbsd_nat_target::insert_vfork_catchpoint (int pid)
+{
+ return 0;
+}
+
+int
+fbsd_nat_target::remove_vfork_catchpoint (int pid)
+{
+ return 0;
+}
+#endif
+
+/* Implement the "post_startup_inferior" target_ops method. */
+
+void
+fbsd_nat_target::post_startup_inferior (ptid_t pid)
+{
+ fbsd_enable_proc_events (pid.pid ());
+}
+
+/* Implement the "post_attach" target_ops method. */
+
+void
+fbsd_nat_target::post_attach (int pid)
+{
+ fbsd_enable_proc_events (pid);
+ fbsd_add_threads (this, pid);
+}
+
+#ifdef PL_FLAG_EXEC
+/* If the FreeBSD kernel supports PL_FLAG_EXEC, then traced processes
+ will always stop after exec. */
+
+int
+fbsd_nat_target::insert_exec_catchpoint (int pid)
+{
+ return 0;
+}
+
+int
+fbsd_nat_target::remove_exec_catchpoint (int pid)
+{
+ return 0;
+}
+#endif
+
+#ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE
+int
+fbsd_nat_target::set_syscall_catchpoint (int pid, bool needed,
+ int any_count,
+ gdb::array_view<const int> syscall_counts)
+{
+
+ /* Ignore the arguments. inf-ptrace.c will use PT_SYSCALL which
+ will catch all system call entries and exits. The system calls
+ are filtered by GDB rather than the kernel. */
+ return 0;
+}
+#endif
+#endif
+
+void
+_initialize_fbsd_nat (void)
+{
+#ifdef PT_LWPINFO
+ add_setshow_boolean_cmd ("fbsd-lwp", class_maintenance,
+ &debug_fbsd_lwp, _("\
+Set debugging of FreeBSD lwp module."), _("\
+Show debugging of FreeBSD lwp module."), _("\
+Enables printf debugging output."),
+ NULL,
+ &show_fbsd_lwp_debug,
+ &setdebuglist, &showdebuglist);
+ add_setshow_boolean_cmd ("fbsd-nat", class_maintenance,
+ &debug_fbsd_nat, _("\
+Set debugging of FreeBSD native target."), _("\
+Show debugging of FreeBSD native target."), _("\
+Enables printf debugging output."),
+ NULL,
+ &show_fbsd_nat_debug,
+ &setdebuglist, &showdebuglist);
+#endif
}
projects / deliverable / binutils-gdb.git / blobdiff