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nto-procfs.c
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nto-procfs.c
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/* Machine independent support for QNX Neutrino /proc (process file system)
for GDB. Written by Colin Burgess at QNX Software Systems Limited.
Copyright (C) 2003-2024 Free Software Foundation, Inc.
Contributed by QNX Software Systems Ltd.
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 <fcntl.h>
#include <spawn.h>
#include <sys/debug.h>
#include <sys/procfs.h>
#include <sys/neutrino.h>
#include <sys/syspage.h>
#include <dirent.h>
#include <sys/netmgr.h>
#include <sys/auxv.h>
#include "gdbcore.h"
#include "inferior.h"
#include "target.h"
#include "objfiles.h"
#include "gdbthread.h"
#include "nto-tdep.h"
#include "command.h"
#include "regcache.h"
#include "solib.h"
#include "inf-child.h"
#include "gdbsupport/filestuff.h"
#include "gdbsupport/scoped_fd.h"
#define NULL_PID 0
#define _DEBUG_FLAG_TRACE (_DEBUG_FLAG_TRACE_EXEC|_DEBUG_FLAG_TRACE_RD|\
_DEBUG_FLAG_TRACE_WR|_DEBUG_FLAG_TRACE_MODIFY)
int ctl_fd;
static sighandler_t ofunc;
static procfs_run run;
/* Create the "native" and "procfs" targets. */
struct nto_procfs_target : public inf_child_target
{
void open (const char *arg, int from_tty) override;
void attach (const char *, int) override = 0;
void post_attach (int);
void detach (inferior *, int) override;
void resume (ptid_t, int, enum gdb_signal) override;
ptid_t wait (ptid_t, struct target_waitstatus *, target_wait_flags) override;
void fetch_registers (struct regcache *, int) override;
void store_registers (struct regcache *, int) override;
enum target_xfer_status xfer_partial (enum target_object object,
const char *annex,
gdb_byte *readbuf,
const gdb_byte *writebuf,
ULONGEST offset, ULONGEST len,
ULONGEST *xfered_len) override;
void files_info () override;
int insert_breakpoint (struct gdbarch *, struct bp_target_info *) override;
int remove_breakpoint (struct gdbarch *, struct bp_target_info *,
enum remove_bp_reason) override;
int can_use_hw_breakpoint (enum bptype, int, int) override;
int insert_hw_breakpoint (struct gdbarch *, struct bp_target_info *) override;
int remove_hw_breakpoint (struct gdbarch *, struct bp_target_info *) override;
int insert_watchpoint (CORE_ADDR, int, enum target_hw_bp_type,
struct expression *) override;
int remove_watchpoint (CORE_ADDR, int, enum target_hw_bp_type,
struct expression *) override;
bool stopped_by_watchpoint () override;
void kill () override;
void create_inferior (const char *, const std::string &,
char **, int) override;
void mourn_inferior () override;
void pass_signals (gdb::array_view<const unsigned char>) override;
bool thread_alive (ptid_t ptid) override;
void update_thread_list () override;
std::string pid_to_str (ptid_t) override;
void interrupt () override;
const char *extra_thread_info (struct thread_info *) override;
const char *pid_to_exec_file (int pid) override;
};
/* For "target native". */
static const target_info nto_native_target_info = {
"native",
N_("QNX Neutrino local process"),
N_("QNX Neutrino local process (started by the \"run\" command).")
};
class nto_procfs_target_native final : public nto_procfs_target
{
const target_info &info () const override
{ return nto_native_target_info; }
};
/* For "target procfs <node>". */
static const target_info nto_procfs_target_info = {
"procfs",
N_("QNX Neutrino local or remote process"),
N_("QNX Neutrino process. target procfs NODE")
};
struct nto_procfs_target_procfs final : public nto_procfs_target
{
const target_info &info () const override
{ return nto_procfs_target_info; }
};
static ptid_t do_attach (ptid_t ptid);
/* These two globals are only ever set in procfs_open_1, but are
referenced elsewhere. 'nto_procfs_node' is a flag used to say
whether we are local, or we should get the current node descriptor
for the remote QNX node. */
static char *nodestr;
static unsigned nto_procfs_node = ND_LOCAL_NODE;
/* Return the current QNX Node, or error out. This is a simple
wrapper for the netmgr_strtond() function. The reason this
is required is because QNX node descriptors are transient so
we have to re-acquire them every time. */
static unsigned
nto_node (void)
{
unsigned node;
if (ND_NODE_CMP (nto_procfs_node, ND_LOCAL_NODE) == 0
|| nodestr == NULL)
return ND_LOCAL_NODE;
node = netmgr_strtond (nodestr, 0);
if (node == -1)
error (_("Lost the QNX node. Debug session probably over."));
return (node);
}
static enum gdb_osabi
procfs_is_nto_target (bfd *abfd)
{
return GDB_OSABI_QNXNTO;
}
/* This is called when we call 'target native' or 'target procfs
<arg>' from the (gdb) prompt. For QNX6 (nto), the only valid arg
will be a QNX node string, eg: "/net/some_node". If arg is not a
valid QNX node, we will default to local. */
void
nto_procfs_target::open (const char *arg, int from_tty)
{
char *endstr;
char buffer[50];
int total_size;
procfs_sysinfo *sysinfo;
char nto_procfs_path[PATH_MAX];
/* Offer to kill previous inferiors before opening this target. */
target_preopen (from_tty);
nto_is_nto_target = procfs_is_nto_target;
/* Set the default node used for spawning to this one,
and only override it if there is a valid arg. */
xfree (nodestr);
nodestr = NULL;
nto_procfs_node = ND_LOCAL_NODE;
nodestr = (arg != NULL) ? xstrdup (arg) : NULL;
if (nodestr)
{
nto_procfs_node = netmgr_strtond (nodestr, &endstr);
if (nto_procfs_node == -1)
{
if (errno == ENOTSUP)
gdb_printf ("QNX Net Manager not found.\n");
gdb_printf ("Invalid QNX node %s: error %d (%s).\n", nodestr,
errno, safe_strerror (errno));
xfree (nodestr);
nodestr = NULL;
nto_procfs_node = ND_LOCAL_NODE;
}
else if (*endstr)
{
if (*(endstr - 1) == '/')
*(endstr - 1) = 0;
else
*endstr = 0;
}
}
snprintf (nto_procfs_path, PATH_MAX - 1, "%s%s",
(nodestr != NULL) ? nodestr : "", "/proc");
scoped_fd fd (open (nto_procfs_path, O_RDONLY));
if (fd.get () == -1)
{
gdb_printf ("Error opening %s : %d (%s)\n", nto_procfs_path, errno,
safe_strerror (errno));
error (_("Invalid procfs arg"));
}
sysinfo = (void *) buffer;
if (devctl (fd.get (), DCMD_PROC_SYSINFO, sysinfo, sizeof buffer, 0) != EOK)
{
gdb_printf ("Error getting size: %d (%s)\n", errno,
safe_strerror (errno));
error (_("Devctl failed."));
}
else
{
total_size = sysinfo->total_size;
sysinfo = alloca (total_size);
if (sysinfo == NULL)
{
gdb_printf ("Memory error: %d (%s)\n", errno,
safe_strerror (errno));
error (_("alloca failed."));
}
else
{
if (devctl (fd.get (), DCMD_PROC_SYSINFO, sysinfo, total_size, 0)
!= EOK)
{
gdb_printf ("Error getting sysinfo: %d (%s)\n", errno,
safe_strerror (errno));
error (_("Devctl failed."));
}
else
{
if (sysinfo->type !=
nto_map_arch_to_cputype
(gdbarch_bfd_arch_info
(current_inferior ()->arch ())->arch_name))
error (_("Invalid target CPU."));
}
}
}
inf_child_target::open (arg, from_tty);
gdb_printf ("Debugging using %s\n", nto_procfs_path);
}
static void
procfs_set_thread (ptid_t ptid)
{
pid_t tid;
tid = ptid.tid ();
devctl (ctl_fd, DCMD_PROC_CURTHREAD, &tid, sizeof (tid), 0);
}
/* Return true if the thread TH is still alive. */
bool
nto_procfs_target::thread_alive (ptid_t ptid)
{
pid_t tid;
pid_t pid;
procfs_status status;
int err;
tid = ptid.tid ();
pid = ptid.pid ();
if (kill (pid, 0) == -1)
return false;
status.tid = tid;
if ((err = devctl (ctl_fd, DCMD_PROC_TIDSTATUS,
&status, sizeof (status), 0)) != EOK)
return false;
/* Thread is alive or dead but not yet joined,
or dead and there is an alive (or dead unjoined) thread with
higher tid.
If the tid is not the same as requested, requested tid is dead. */
return (status.tid == tid) && (status.state != STATE_DEAD);
}
static void
update_thread_private_data_name (struct thread_info *new_thread,
const char *newname)
{
nto_thread_info *pti = get_nto_thread_info (new_thread);
gdb_assert (newname != NULL);
gdb_assert (new_thread != NULL);
if (pti)
{
pti = new nto_thread_info;
new_thread->priv.reset (pti);
}
pti->name = newname;
}
static void
update_thread_private_data (struct thread_info *new_thread,
pthread_t tid, int state, int flags)
{
procfs_info pidinfo;
struct _thread_name *tn;
procfs_threadctl tctl;
#if _NTO_VERSION > 630
gdb_assert (new_thread != NULL);
if (devctl (ctl_fd, DCMD_PROC_INFO, &pidinfo,
sizeof(pidinfo), 0) != EOK)
return;
memset (&tctl, 0, sizeof (tctl));
tctl.cmd = _NTO_TCTL_NAME;
tn = (struct _thread_name *) (&tctl.data);
/* Fetch name for the given thread. */
tctl.tid = tid;
tn->name_buf_len = sizeof (tctl.data) - sizeof (*tn);
tn->new_name_len = -1; /* Getting, not setting. */
if (devctl (ctl_fd, DCMD_PROC_THREADCTL, &tctl, sizeof (tctl), NULL) != EOK)
tn->name_buf[0] = '\0';
tn->name_buf[_NTO_THREAD_NAME_MAX] = '\0';
update_thread_private_data_name (new_thread, tn->name_buf);
nto_thread_info *pti = get_nto_thread_info (new_thread);
pti->tid = tid;
pti->state = state;
pti->flags = flags;
#endif /* _NTO_VERSION */
}
void
nto_procfs_target::update_thread_list ()
{
procfs_status status;
pid_t pid;
ptid_t ptid;
pthread_t tid;
struct thread_info *new_thread;
if (ctl_fd == -1)
return;
prune_threads ();
pid = current_inferior ()->pid;
status.tid = 1;
for (tid = 1;; ++tid)
{
if (status.tid == tid
&& (devctl (ctl_fd, DCMD_PROC_TIDSTATUS, &status, sizeof (status), 0)
!= EOK))
break;
if (status.tid != tid)
/* The reason why this would not be equal is that devctl might have
returned different tid, meaning the requested tid no longer exists
(e.g. thread exited). */
continue;
ptid = ptid_t (pid, 0, tid);
new_thread = this->find_thread (ptid);
if (!new_thread)
new_thread = add_thread (ptid);
update_thread_private_data (new_thread, tid, status.state, 0);
status.tid++;
}
return;
}
static void
procfs_pidlist (const char *args, int from_tty)
{
struct dirent *dirp = NULL;
char buf[PATH_MAX];
procfs_info *pidinfo = NULL;
procfs_debuginfo *info = NULL;
procfs_status *status = NULL;
pid_t num_threads = 0;
pid_t pid;
char name[512];
char procfs_dir[PATH_MAX];
snprintf (procfs_dir, sizeof (procfs_dir), "%s%s",
(nodestr != NULL) ? nodestr : "", "/proc");
gdb_dir_up dp (opendir (procfs_dir));
if (dp == NULL)
{
gdb_printf (gdb_stderr, "failed to opendir \"%s\" - %d (%s)",
procfs_dir, errno, safe_strerror (errno));
return;
}
/* Start scan at first pid. */
rewinddir (dp.get ());
do
{
/* Get the right pid and procfs path for the pid. */
do
{
dirp = readdir (dp.get ());
if (dirp == NULL)
return;
snprintf (buf, sizeof (buf), "%s%s/%s/as",
(nodestr != NULL) ? nodestr : "",
"/proc", dirp->d_name);
pid = atoi (dirp->d_name);
}
while (pid == 0);
/* Open the procfs path. */
scoped_fd fd (open (buf, O_RDONLY));
if (fd.get () == -1)
{
gdb_printf (gdb_stderr, "failed to open %s - %d (%s)\n",
buf, errno, safe_strerror (errno));
continue;
}
pidinfo = (procfs_info *) buf;
if (devctl (fd.get (), DCMD_PROC_INFO, pidinfo, sizeof (buf), 0) != EOK)
{
gdb_printf (gdb_stderr,
"devctl DCMD_PROC_INFO failed - %d (%s)\n",
errno, safe_strerror (errno));
break;
}
num_threads = pidinfo->num_threads;
info = (procfs_debuginfo *) buf;
if (devctl (fd.get (), DCMD_PROC_MAPDEBUG_BASE, info, sizeof (buf), 0)
!= EOK)
strcpy (name, "unavailable");
else
strcpy (name, info->path);
/* Collect state info on all the threads. */
status = (procfs_status *) buf;
for (status->tid = 1; status->tid <= num_threads; status->tid++)
{
const int err
= devctl (fd.get (), DCMD_PROC_TIDSTATUS, status, sizeof (buf), 0);
gdb_printf ("%s - %d", name, pid);
if (err == EOK && status->tid != 0)
gdb_printf ("/%d\n", status->tid);
else
{
gdb_printf ("\n");
break;
}
}
}
while (dirp != NULL);
}
static void
procfs_meminfo (const char *args, int from_tty)
{
procfs_mapinfo *mapinfos = NULL;
static int num_mapinfos = 0;
procfs_mapinfo *mapinfo_p, *mapinfo_p2;
int flags = ~0, err, num, i, j;
struct
{
procfs_debuginfo info;
char buff[_POSIX_PATH_MAX];
} map;
struct info
{
unsigned addr;
unsigned size;
unsigned flags;
unsigned debug_vaddr;
unsigned long long offset;
};
struct printinfo
{
unsigned long long ino;
unsigned dev;
struct info text;
struct info data;
char name[256];
} printme;
/* Get the number of map entrys. */
err = devctl (ctl_fd, DCMD_PROC_MAPINFO, NULL, 0, &num);
if (err != EOK)
{
printf ("failed devctl num mapinfos - %d (%s)\n", err,
safe_strerror (err));
return;
}
mapinfos = XNEWVEC (procfs_mapinfo, num);
num_mapinfos = num;
mapinfo_p = mapinfos;
/* Fill the map entrys. */
err = devctl (ctl_fd, DCMD_PROC_MAPINFO, mapinfo_p, num
* sizeof (procfs_mapinfo), &num);
if (err != EOK)
{
printf ("failed devctl mapinfos - %d (%s)\n", err, safe_strerror (err));
xfree (mapinfos);
return;
}
num = std::min (num, num_mapinfos);
/* Run through the list of mapinfos, and store the data and text info
so we can print it at the bottom of the loop. */
for (mapinfo_p = mapinfos, i = 0; i < num; i++, mapinfo_p++)
{
if (!(mapinfo_p->flags & flags))
mapinfo_p->ino = 0;
if (mapinfo_p->ino == 0) /* Already visited. */
continue;
map.info.vaddr = mapinfo_p->vaddr;
err = devctl (ctl_fd, DCMD_PROC_MAPDEBUG, &map, sizeof (map), 0);
if (err != EOK)
continue;
memset (&printme, 0, sizeof printme);
printme.dev = mapinfo_p->dev;
printme.ino = mapinfo_p->ino;
printme.text.addr = mapinfo_p->vaddr;
printme.text.size = mapinfo_p->size;
printme.text.flags = mapinfo_p->flags;
printme.text.offset = mapinfo_p->offset;
printme.text.debug_vaddr = map.info.vaddr;
strcpy (printme.name, map.info.path);
/* Check for matching data. */
for (mapinfo_p2 = mapinfos, j = 0; j < num; j++, mapinfo_p2++)
{
if (mapinfo_p2->vaddr != mapinfo_p->vaddr
&& mapinfo_p2->ino == mapinfo_p->ino
&& mapinfo_p2->dev == mapinfo_p->dev)
{
map.info.vaddr = mapinfo_p2->vaddr;
err =
devctl (ctl_fd, DCMD_PROC_MAPDEBUG, &map, sizeof (map), 0);
if (err != EOK)
continue;
if (strcmp (map.info.path, printme.name))
continue;
/* Lower debug_vaddr is always text, if necessary, swap. */
if ((int) map.info.vaddr < (int) printme.text.debug_vaddr)
{
memcpy (&(printme.data), &(printme.text),
sizeof (printme.data));
printme.text.addr = mapinfo_p2->vaddr;
printme.text.size = mapinfo_p2->size;
printme.text.flags = mapinfo_p2->flags;
printme.text.offset = mapinfo_p2->offset;
printme.text.debug_vaddr = map.info.vaddr;
}
else
{
printme.data.addr = mapinfo_p2->vaddr;
printme.data.size = mapinfo_p2->size;
printme.data.flags = mapinfo_p2->flags;
printme.data.offset = mapinfo_p2->offset;
printme.data.debug_vaddr = map.info.vaddr;
}
mapinfo_p2->ino = 0;
}
}
mapinfo_p->ino = 0;
gdb_printf ("%s\n", printme.name);
gdb_printf ("\ttext=%08x bytes @ 0x%08x\n", printme.text.size,
printme.text.addr);
gdb_printf ("\t\tflags=%08x\n", printme.text.flags);
gdb_printf ("\t\tdebug=%08x\n", printme.text.debug_vaddr);
gdb_printf ("\t\toffset=%s\n", phex (printme.text.offset, 8));
if (printme.data.size)
{
gdb_printf ("\tdata=%08x bytes @ 0x%08x\n", printme.data.size,
printme.data.addr);
gdb_printf ("\t\tflags=%08x\n", printme.data.flags);
gdb_printf ("\t\tdebug=%08x\n", printme.data.debug_vaddr);
gdb_printf ("\t\toffset=%s\n", phex (printme.data.offset, 8));
}
gdb_printf ("\tdev=0x%x\n", printme.dev);
gdb_printf ("\tino=0x%x\n", (unsigned int) printme.ino);
}
xfree (mapinfos);
return;
}
/* Print status information about what we're accessing. */
void
nto_procfs_target::files_info ()
{
struct inferior *inf = current_inferior ();
gdb_printf ("\tUsing the running image of %s %s via %s.\n",
inf->attach_flag ? "attached" : "child",
target_pid_to_str (ptid_t (inf->pid)).c_str (),
(nodestr != NULL) ? nodestr : "local node");
}
/* Target to_pid_to_exec_file implementation. */
const char *
nto_procfs_target::pid_to_exec_file (const int pid)
{
int proc_fd;
static char proc_path[PATH_MAX];
ssize_t rd;
/* Read exe file name. */
snprintf (proc_path, sizeof (proc_path), "%s/proc/%d/exefile",
(nodestr != NULL) ? nodestr : "", pid);
proc_fd = open (proc_path, O_RDONLY);
if (proc_fd == -1)
return NULL;
rd = read (proc_fd, proc_path, sizeof (proc_path) - 1);
close (proc_fd);
if (rd <= 0)
{
proc_path[0] = '\0';
return NULL;
}
proc_path[rd] = '\0';
return proc_path;
}
/* Attach to process PID, then initialize for debugging it. */
void
nto_procfs_target::attach (const char *args, int from_tty)
{
int pid;
struct inferior *inf;
pid = parse_pid_to_attach (args);
if (pid == getpid ())
error (_("Attaching GDB to itself is not a good idea..."));
target_announce_attach (from_tty, pid);
ptid_t ptid = do_attach (ptid_t (pid));
inf = current_inferior ();
inferior_appeared (inf, pid);
inf->attach_flag = true;
if (!inf->target_is_pushed (ops))
inf->push_target (ops);
update_thread_list ();
switch_to_thread (this->find_thread (ptid));
}
void
nto_procfs_target::post_attach (pid_t pid)
{
if (current_program_space->exec_bfd ())
solib_create_inferior_hook (0);
}
static ptid_t
do_attach (ptid_t ptid)
{
procfs_status status;
struct sigevent event;
char path[PATH_MAX];
snprintf (path, PATH_MAX - 1, "%s%s/%d/as",
(nodestr != NULL) ? nodestr : "", "/proc", ptid.pid ());
ctl_fd = open (path, O_RDWR);
if (ctl_fd == -1)
error (_("Couldn't open proc file %s, error %d (%s)"), path, errno,
safe_strerror (errno));
if (devctl (ctl_fd, DCMD_PROC_STOP, &status, sizeof (status), 0) != EOK)
error (_("Couldn't stop process"));
/* Define a sigevent for process stopped notification. */
event.sigev_notify = SIGEV_SIGNAL_THREAD;
event.sigev_signo = SIGUSR1;
event.sigev_code = 0;
event.sigev_value.sival_ptr = NULL;
event.sigev_priority = -1;
devctl (ctl_fd, DCMD_PROC_EVENT, &event, sizeof (event), 0);
if (devctl (ctl_fd, DCMD_PROC_STATUS, &status, sizeof (status), 0) == EOK
&& status.flags & _DEBUG_FLAG_STOPPED)
SignalKill (nto_node (), ptid.pid (), 0, SIGCONT, 0, 0);
nto_init_solib_absolute_prefix ();
return ptid_t (ptid.pid (), 0, status.tid);
}
/* Ask the user what to do when an interrupt is received. */
static void
interrupt_query (void)
{
if (query (_("Interrupted while waiting for the program.\n\
Give up (and stop debugging it)? ")))
{
target_mourn_inferior (inferior_ptid);
quit ();
}
}
/* The user typed ^C twice. */
static void
nto_handle_sigint_twice (int signo)
{
signal (signo, ofunc);
interrupt_query ();
signal (signo, nto_handle_sigint_twice);
}
static void
nto_handle_sigint (int signo)
{
/* If this doesn't work, try more severe steps. */
signal (signo, nto_handle_sigint_twice);
target_interrupt ();
}
sptid_t
nto_procfs_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
target_wait_flags options)
{
sigset_t set;
siginfo_t info;
procfs_status status;
static int exit_signo = 0; /* To track signals that cause termination. */
ourstatus->set_spurious ();
if (inferior_ptid == null_ptid)
{
ourstatus->set_stopped (GDB_SIGNAL_0);
exit_signo = 0;
return null_ptid;
}
sigemptyset (&set);
sigaddset (&set, SIGUSR1);
devctl (ctl_fd, DCMD_PROC_STATUS, &status, sizeof (status), 0);
while (!(status.flags & _DEBUG_FLAG_ISTOP))
{
ofunc = signal (SIGINT, nto_handle_sigint);
sigwaitinfo (&set, &info);
signal (SIGINT, ofunc);
devctl (ctl_fd, DCMD_PROC_STATUS, &status, sizeof (status), 0);
}
nto_inferior_data (NULL)->stopped_flags = status.flags;
nto_inferior_data (NULL)->stopped_pc = status.ip;
if (status.flags & _DEBUG_FLAG_SSTEP)
ourstatus->set_stopped (GDB_SIGNAL_TRAP);
/* Was it a breakpoint? */
else if (status.flags & _DEBUG_FLAG_TRACE)
ourstatus->set_stopped (GDB_SIGNAL_TRAP);
else if (status.flags & _DEBUG_FLAG_ISTOP)
{
switch (status.why)
{
case _DEBUG_WHY_SIGNALLED:
ourstatus->set_stopped (gdb_signal_from_host (status.info.si_signo));
exit_signo = 0;
break;
case _DEBUG_WHY_FAULTED:
if (status.info.si_signo == SIGTRAP)
{
ourstatus->set_stopped (0);
exit_signo = 0;
}
else
{
ourstatus->set_stopped
(gdb_signal_from_host (status.info.si_signo));
exit_signo = ourstatus->sig ();
}
break;
case _DEBUG_WHY_TERMINATED:
{
int waitval = 0;
waitpid (inferior_ptid.pid (), &waitval, WNOHANG);
if (exit_signo)
{
/* Abnormal death. */
ourstatus->set_signalled (exit_signo);
}
else
{
/* Normal death. */
ourstatus->set_exited (WEXITSTATUS (waitval));
}
exit_signo = 0;
break;
}
case _DEBUG_WHY_REQUESTED:
/* We are assuming a requested stop is due to a SIGINT. */
ourstatus->set_stopped (GDB_SIGNAL_INT);
exit_signo = 0;
break;
}
}
return ptid_t (status.pid, 0, status.tid);
}
/* Read the current values of the inferior's registers, both the
general register set and floating point registers (if supported)
and update gdb's idea of their current values. */
void
nto_procfs_target::fetch_registers (struct regcache *regcache, int regno)
{
union
{
procfs_greg greg;
procfs_fpreg fpreg;
procfs_altreg altreg;
}
reg;
int regsize;
procfs_set_thread (regcache->ptid ());
if (devctl (ctl_fd, DCMD_PROC_GETGREG, ®, sizeof (reg), ®size) == EOK)
nto_supply_gregset (regcache, (char *) ®.greg);
if (devctl (ctl_fd, DCMD_PROC_GETFPREG, ®, sizeof (reg), ®size)
== EOK)
nto_supply_fpregset (regcache, (char *) ®.fpreg);
if (devctl (ctl_fd, DCMD_PROC_GETALTREG, ®, sizeof (reg), ®size)
== EOK)
nto_supply_altregset (regcache, (char *) ®.altreg);
}
/* Helper for procfs_xfer_partial that handles memory transfers.
Arguments are like target_xfer_partial. */
static enum target_xfer_status
procfs_xfer_memory (gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST memaddr, ULONGEST len, ULONGEST *xfered_len)
{
int nbytes;
if (lseek (ctl_fd, (off_t) memaddr, SEEK_SET) != (off_t) memaddr)
return TARGET_XFER_E_IO;
if (writebuf != NULL)
nbytes = write (ctl_fd, writebuf, len);
else
nbytes = read (ctl_fd, readbuf, len);
if (nbytes <= 0)
return TARGET_XFER_E_IO;
*xfered_len = nbytes;
return TARGET_XFER_OK;
}
/* Target to_xfer_partial implementation. */
enum target_xfer_status
nto_procfs_target::xfer_partial (enum target_object object,
const char *annex, gdb_byte *readbuf,
const gdb_byte *writebuf, ULONGEST offset,
ULONGEST len, ULONGEST *xfered_len)
{
switch (object)
{
case TARGET_OBJECT_MEMORY:
return procfs_xfer_memory (readbuf, writebuf, offset, len, xfered_len);
case TARGET_OBJECT_AUXV:
if (readbuf != NULL)
{
int err;
CORE_ADDR initial_stack;
debug_process_t procinfo;
/* For 32-bit architecture, size of auxv_t is 8 bytes. */
const unsigned int sizeof_auxv_t = sizeof (auxv_t);
const unsigned int sizeof_tempbuf = 20 * sizeof_auxv_t;
int tempread;
gdb_byte *const tempbuf = alloca (sizeof_tempbuf);
if (tempbuf == NULL)
return TARGET_XFER_E_IO;
err = devctl (ctl_fd, DCMD_PROC_INFO, &procinfo,
sizeof procinfo, 0);
if (err != EOK)
return TARGET_XFER_E_IO;
initial_stack = procinfo.initial_stack;
/* procfs is always 'self-hosted', no byte-order manipulation. */
tempread = nto_read_auxv_from_initial_stack (initial_stack, tempbuf,
sizeof_tempbuf,
sizeof (auxv_t));
tempread = std::min (tempread, len) - offset;
memcpy (readbuf, tempbuf + offset, tempread);
*xfered_len = tempread;
return tempread ? TARGET_XFER_OK : TARGET_XFER_EOF;
}
/* Fallthru */
default:
return this->beneath ()->xfer_partial (object, annex,
readbuf, writebuf, offset, len,
xfered_len);
}
}
/* Take a program previously attached to and detaches it.
The program resumes execution and will no longer stop
on signals, etc. We'd better not have left any breakpoints
in the program or it'll die when it hits one. */
void
nto_procfs_target::detach (inferior *inf, int from_tty)
{
target_announce_detach ();
if (siggnal)
SignalKill (nto_node (), inf->pid, 0, 0, 0, 0);
close (ctl_fd);
ctl_fd = -1;
switch_to_no_thread ();
detach_inferior (inf->pid);
init_thread_list ();
inf_child_maybe_unpush_target (ops);
}
static int
procfs_breakpoint (CORE_ADDR addr, int type, int size)
{