#include "server.h"
#include "linux-low.h"
+#include "ansidecl.h" /* For ATTRIBUTE_PACKED, must be bug in external.h. */
+#include "elf/common.h"
+#include "elf/external.h"
#include <sys/wait.h>
#include <stdio.h>
#include <pwd.h>
#include <sys/types.h>
#include <dirent.h>
+#include <sys/stat.h>
+#include <sys/vfs.h>
+
+#ifndef SPUFS_MAGIC
+#define SPUFS_MAGIC 0x23c9b64e
+#endif
#ifndef PTRACE_GETSIGINFO
# define PTRACE_GETSIGINFO 0x4202
representation of the thread ID.
``all_lwps'' is keyed by the process ID - which on Linux is (presently)
- the same as the LWP ID. */
+ the same as the LWP ID.
+
+ ``all_processes'' is keyed by the "overall process ID", which
+ GNU/Linux calls tgid, "thread group ID". */
struct inferior_list all_lwps;
/* FIXME make into a target method? */
int using_threads = 1;
-static int thread_db_active;
-static int must_set_ptrace_flags;
-
-/* This flag is true iff we've just created or attached to a new inferior
- but it has not stopped yet. As soon as it does, we need to call the
- low target's arch_setup callback. */
+/* This flag is true iff we've just created or attached to our first
+ inferior but it has not stopped yet. As soon as it does, we need
+ to call the low target's arch_setup callback. Doing this only on
+ the first inferior avoids reinializing the architecture on every
+ inferior, and avoids messing with the register caches of the
+ already running inferiors. NOTE: this assumes all inferiors under
+ control of gdbserver have the same architecture. */
static int new_inferior;
-static void linux_resume_one_lwp (struct inferior_list_entry *entry,
+static void linux_resume_one_lwp (struct lwp_info *lwp,
int step, int signal, siginfo_t *info);
-static void linux_resume (struct thread_resume *resume_info);
+static void linux_resume (struct thread_resume *resume_info, size_t n);
static void stop_all_lwps (void);
-static int linux_wait_for_event (struct thread_info *child);
+static int linux_wait_for_event (ptid_t ptid, int *wstat, int options);
static int check_removed_breakpoint (struct lwp_info *event_child);
-static void *add_lwp (unsigned long pid);
-static int my_waitpid (int pid, int *status, int flags);
+static void *add_lwp (ptid_t ptid);
+static int linux_stopped_by_watchpoint (void);
+static void mark_lwp_dead (struct lwp_info *lwp, int wstat);
struct pending_signals
{
static int num_regsets;
#endif
-#define pid_of(proc) ((proc)->head.id)
+/* The read/write ends of the pipe registered as waitable file in the
+ event loop. */
+static int linux_event_pipe[2] = { -1, -1 };
+
+/* True if we're currently in async mode. */
+#define target_is_async_p() (linux_event_pipe[0] != -1)
+
+static void send_sigstop (struct inferior_list_entry *entry);
+static void wait_for_sigstop (struct inferior_list_entry *entry);
+
+/* Accepts an integer PID; Returns a string representing a file that
+ can be opened to get info for the child process.
+ Space for the result is malloc'd, caller must free. */
+
+char *
+linux_child_pid_to_exec_file (int pid)
+{
+ char *name1, *name2;
+
+ name1 = xmalloc (MAXPATHLEN);
+ name2 = xmalloc (MAXPATHLEN);
+ memset (name2, 0, MAXPATHLEN);
+
+ sprintf (name1, "/proc/%d/exe", pid);
+ if (readlink (name1, name2, MAXPATHLEN) > 0)
+ {
+ free (name1);
+ return name2;
+ }
+ else
+ {
+ free (name2);
+ return name1;
+ }
+}
+
+/* Return non-zero if HEADER is a 64-bit ELF file. */
+
+static int
+elf_64_header_p (const Elf64_External_Ehdr *header)
+{
+ return (header->e_ident[EI_MAG0] == ELFMAG0
+ && header->e_ident[EI_MAG1] == ELFMAG1
+ && header->e_ident[EI_MAG2] == ELFMAG2
+ && header->e_ident[EI_MAG3] == ELFMAG3
+ && header->e_ident[EI_CLASS] == ELFCLASS64);
+}
+
+/* Return non-zero if FILE is a 64-bit ELF file,
+ zero if the file is not a 64-bit ELF file,
+ and -1 if the file is not accessible or doesn't exist. */
+
+int
+elf_64_file_p (const char *file)
+{
+ Elf64_External_Ehdr header;
+ int fd;
+
+ fd = open (file, O_RDONLY);
+ if (fd < 0)
+ return -1;
+
+ if (read (fd, &header, sizeof (header)) != sizeof (header))
+ {
+ close (fd);
+ return 0;
+ }
+ close (fd);
+
+ return elf_64_header_p (&header);
+}
+
+static void
+delete_lwp (struct lwp_info *lwp)
+{
+ remove_thread (get_lwp_thread (lwp));
+ remove_inferior (&all_lwps, &lwp->head);
+ free (lwp->arch_private);
+ free (lwp);
+}
+
+/* Add a process to the common process list, and set its private
+ data. */
+
+static struct process_info *
+linux_add_process (int pid, int attached)
+{
+ struct process_info *proc;
+
+ /* Is this the first process? If so, then set the arch. */
+ if (all_processes.head == NULL)
+ new_inferior = 1;
+
+ proc = add_process (pid, attached);
+ proc->private = xcalloc (1, sizeof (*proc->private));
+
+ if (the_low_target.new_process != NULL)
+ proc->private->arch_private = the_low_target.new_process ();
+
+ return proc;
+}
+
+/* Remove a process from the common process list,
+ also freeing all private data. */
+
+static void
+linux_remove_process (struct process_info *process, int detaching)
+{
+ struct process_info_private *priv = process->private;
+
+#ifdef USE_THREAD_DB
+ thread_db_free (process, detaching);
+#endif
+
+ free (priv->arch_private);
+ free (priv);
+ remove_process (process);
+}
+
+/* Wrapper function for waitpid which handles EINTR, and emulates
+ __WALL for systems where that is not available. */
+
+static int
+my_waitpid (int pid, int *status, int flags)
+{
+ int ret, out_errno;
+
+ if (debug_threads)
+ fprintf (stderr, "my_waitpid (%d, 0x%x)\n", pid, flags);
+
+ if (flags & __WALL)
+ {
+ sigset_t block_mask, org_mask, wake_mask;
+ int wnohang;
+
+ wnohang = (flags & WNOHANG) != 0;
+ flags &= ~(__WALL | __WCLONE);
+ flags |= WNOHANG;
+
+ /* Block all signals while here. This avoids knowing about
+ LinuxThread's signals. */
+ sigfillset (&block_mask);
+ sigprocmask (SIG_BLOCK, &block_mask, &org_mask);
+
+ /* ... except during the sigsuspend below. */
+ sigemptyset (&wake_mask);
+
+ while (1)
+ {
+ /* Since all signals are blocked, there's no need to check
+ for EINTR here. */
+ ret = waitpid (pid, status, flags);
+ out_errno = errno;
+
+ if (ret == -1 && out_errno != ECHILD)
+ break;
+ else if (ret > 0)
+ break;
+
+ if (flags & __WCLONE)
+ {
+ /* We've tried both flavors now. If WNOHANG is set,
+ there's nothing else to do, just bail out. */
+ if (wnohang)
+ break;
+
+ if (debug_threads)
+ fprintf (stderr, "blocking\n");
+
+ /* Block waiting for signals. */
+ sigsuspend (&wake_mask);
+ }
+
+ flags ^= __WCLONE;
+ }
+
+ sigprocmask (SIG_SETMASK, &org_mask, NULL);
+ }
+ else
+ {
+ do
+ ret = waitpid (pid, status, flags);
+ while (ret == -1 && errno == EINTR);
+ out_errno = errno;
+ }
-/* FIXME: Delete eventually. */
-#define inferior_pid (pid_of (get_thread_lwp (current_inferior)))
+ if (debug_threads)
+ fprintf (stderr, "my_waitpid (%d, 0x%x): status(%x), %d\n",
+ pid, flags, status ? *status : -1, ret);
+
+ errno = out_errno;
+ return ret;
+}
+
+/* Handle a GNU/Linux extended wait response. If we see a clone
+ event, we need to add the new LWP to our list (and not report the
+ trap to higher layers). */
static void
handle_extended_wait (struct lwp_info *event_child, int wstat)
if (event == PTRACE_EVENT_CLONE)
{
+ ptid_t ptid;
unsigned long new_pid;
int ret, status = W_STOPCODE (SIGSTOP);
- ptrace (PTRACE_GETEVENTMSG, inferior_pid, 0, &new_pid);
+ ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid);
/* If we haven't already seen the new PID stop, wait for it now. */
if (! pull_pid_from_list (&stopped_pids, new_pid))
ptrace (PTRACE_SETOPTIONS, new_pid, 0, PTRACE_O_TRACECLONE);
- new_lwp = (struct lwp_info *) add_lwp (new_pid);
- add_thread (new_pid, new_lwp, new_pid);
- new_thread_notify (thread_id_to_gdb_id (new_lwp->lwpid));
+ ptid = ptid_build (pid_of (event_child), new_pid, 0);
+ new_lwp = (struct lwp_info *) add_lwp (ptid);
+ add_thread (ptid, new_lwp);
+
+ /* Either we're going to immediately resume the new thread
+ or leave it stopped. linux_resume_one_lwp is a nop if it
+ thinks the thread is currently running, so set this first
+ before calling linux_resume_one_lwp. */
+ new_lwp->stopped = 1;
/* Normally we will get the pending SIGSTOP. But in some cases
we might get another signal delivered to the group first.
If we do get another signal, be sure not to lose it. */
if (WSTOPSIG (status) == SIGSTOP)
{
- if (stopping_threads)
- new_lwp->stopped = 1;
- else
- ptrace (PTRACE_CONT, new_pid, 0, 0);
+ if (! stopping_threads)
+ linux_resume_one_lwp (new_lwp, 0, 0, NULL);
}
else
{
new_lwp->stop_expected = 1;
if (stopping_threads)
{
- new_lwp->stopped = 1;
new_lwp->status_pending_p = 1;
new_lwp->status_pending = status;
}
else
/* Pass the signal on. This is what GDB does - except
shouldn't we really report it instead? */
- ptrace (PTRACE_CONT, new_pid, 0, WSTOPSIG (status));
+ linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL);
}
/* Always resume the current thread. If we are stopping
threads, it will have a pending SIGSTOP; we may as well
collect it now. */
- linux_resume_one_lwp (&event_child->head,
- event_child->stepping, 0, NULL);
+ linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL);
}
}
{
CORE_ADDR stop_pc = (*the_low_target.get_pc) ();
- if (get_thread_lwp (current_inferior)->stepping)
- return stop_pc;
- else
- return stop_pc - the_low_target.decr_pc_after_break;
+ if (! get_thread_lwp (current_inferior)->stepping)
+ stop_pc -= the_low_target.decr_pc_after_break;
+
+ if (debug_threads)
+ fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc);
+
+ return stop_pc;
}
static void *
-add_lwp (unsigned long pid)
+add_lwp (ptid_t ptid)
{
struct lwp_info *lwp;
lwp = (struct lwp_info *) xmalloc (sizeof (*lwp));
memset (lwp, 0, sizeof (*lwp));
- lwp->head.id = pid;
- lwp->lwpid = pid;
+ lwp->head.id = ptid;
+
+ if (the_low_target.new_thread != NULL)
+ lwp->arch_private = the_low_target.new_thread ();
add_inferior_to_list (&all_lwps, &lwp->head);
static int
linux_create_inferior (char *program, char **allargs)
{
- void *new_lwp;
+ struct lwp_info *new_lwp;
int pid;
+ ptid_t ptid;
#if defined(__UCLIBC__) && defined(HAS_NOMMU)
pid = vfork ();
_exit (0177);
}
- new_lwp = add_lwp (pid);
- add_thread (pid, new_lwp, pid);
- must_set_ptrace_flags = 1;
- new_inferior = 1;
+ linux_add_process (pid, 0);
+
+ ptid = ptid_build (pid, pid, 0);
+ new_lwp = add_lwp (ptid);
+ add_thread (ptid, new_lwp);
+ new_lwp->must_set_ptrace_flags = 1;
return pid;
}
/* Attach to an inferior process. */
-void
-linux_attach_lwp (unsigned long pid)
+static void
+linux_attach_lwp_1 (unsigned long lwpid, int initial)
{
+ ptid_t ptid;
struct lwp_info *new_lwp;
- if (ptrace (PTRACE_ATTACH, pid, 0, 0) != 0)
+ if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0)
{
- if (all_threads.head != NULL)
+ if (!initial)
{
/* If we fail to attach to an LWP, just warn. */
- fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", pid,
+ fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid,
strerror (errno), errno);
fflush (stderr);
return;
}
else
/* If we fail to attach to a process, report an error. */
- error ("Cannot attach to process %ld: %s (%d)\n", pid,
+ error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid,
strerror (errno), errno);
}
- /* FIXME: This intermittently fails.
- We need to wait for SIGSTOP first. */
- ptrace (PTRACE_SETOPTIONS, pid, 0, PTRACE_O_TRACECLONE);
+ if (initial)
+ /* NOTE/FIXME: This lwp might have not been the tgid. */
+ ptid = ptid_build (lwpid, lwpid, 0);
+ else
+ {
+ /* Note that extracting the pid from the current inferior is
+ safe, since we're always called in the context of the same
+ process as this new thread. */
+ int pid = pid_of (get_thread_lwp (current_inferior));
+ ptid = ptid_build (pid, lwpid, 0);
+ }
+
+ new_lwp = (struct lwp_info *) add_lwp (ptid);
+ add_thread (ptid, new_lwp);
- new_lwp = (struct lwp_info *) add_lwp (pid);
- add_thread (pid, new_lwp, pid);
- new_thread_notify (thread_id_to_gdb_id (new_lwp->lwpid));
+ /* We need to wait for SIGSTOP before being able to make the next
+ ptrace call on this LWP. */
+ new_lwp->must_set_ptrace_flags = 1;
/* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
brings it to a halt.
new_lwp->stop_expected = 1;
}
+void
+linux_attach_lwp (unsigned long lwpid)
+{
+ linux_attach_lwp_1 (lwpid, 0);
+}
+
int
linux_attach (unsigned long pid)
{
struct lwp_info *lwp;
- linux_attach_lwp (pid);
+ linux_attach_lwp_1 (pid, 1);
- /* Don't ignore the initial SIGSTOP if we just attached to this process.
- It will be collected by wait shortly. */
- lwp = (struct lwp_info *) find_inferior_id (&all_lwps, pid);
- lwp->stop_expected = 0;
+ linux_add_process (pid, 1);
- new_inferior = 1;
+ if (!non_stop)
+ {
+ /* Don't ignore the initial SIGSTOP if we just attached to this
+ process. It will be collected by wait shortly. */
+ lwp = (struct lwp_info *) find_inferior_id (&all_lwps,
+ ptid_build (pid, pid, 0));
+ lwp->stop_expected = 0;
+ }
return 0;
}
-/* Kill the inferior process. Make us have no inferior. */
+struct counter
+{
+ int pid;
+ int count;
+};
-static void
-linux_kill_one_lwp (struct inferior_list_entry *entry)
+static int
+second_thread_of_pid_p (struct inferior_list_entry *entry, void *args)
+{
+ struct counter *counter = args;
+
+ if (ptid_get_pid (entry->id) == counter->pid)
+ {
+ if (++counter->count > 1)
+ return 1;
+ }
+
+ return 0;
+}
+
+static int
+last_thread_of_process_p (struct thread_info *thread)
+{
+ ptid_t ptid = ((struct inferior_list_entry *)thread)->id;
+ int pid = ptid_get_pid (ptid);
+ struct counter counter = { pid , 0 };
+
+ return (find_inferior (&all_threads,
+ second_thread_of_pid_p, &counter) == NULL);
+}
+
+/* Kill the inferior lwp. */
+
+static int
+linux_kill_one_lwp (struct inferior_list_entry *entry, void *args)
{
struct thread_info *thread = (struct thread_info *) entry;
struct lwp_info *lwp = get_thread_lwp (thread);
int wstat;
+ int pid = * (int *) args;
+
+ if (ptid_get_pid (entry->id) != pid)
+ return 0;
/* We avoid killing the first thread here, because of a Linux kernel (at
least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
the children get a chance to be reaped, it will remain a zombie
forever. */
- if (entry == all_threads.head)
- return;
+
+ if (lwpid_of (lwp) == pid)
+ {
+ if (debug_threads)
+ fprintf (stderr, "lkop: is last of process %s\n",
+ target_pid_to_str (entry->id));
+ return 0;
+ }
+
+ /* If we're killing a running inferior, make sure it is stopped
+ first, as PTRACE_KILL will not work otherwise. */
+ if (!lwp->stopped)
+ send_sigstop (&lwp->head);
do
{
- ptrace (PTRACE_KILL, pid_of (lwp), 0, 0);
+ ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0);
/* Make sure it died. The loop is most likely unnecessary. */
- wstat = linux_wait_for_event (thread);
- } while (WIFSTOPPED (wstat));
+ pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL);
+ } while (pid > 0 && WIFSTOPPED (wstat));
+
+ return 0;
}
-static void
-linux_kill (void)
+static int
+linux_kill (int pid)
{
- struct thread_info *thread = (struct thread_info *) all_threads.head;
+ struct process_info *process;
struct lwp_info *lwp;
+ struct thread_info *thread;
int wstat;
+ int lwpid;
- if (thread == NULL)
- return;
+ process = find_process_pid (pid);
+ if (process == NULL)
+ return -1;
- for_each_inferior (&all_threads, linux_kill_one_lwp);
+ find_inferior (&all_threads, linux_kill_one_lwp, &pid);
/* See the comment in linux_kill_one_lwp. We did not kill the first
thread in the list, so do so now. */
- lwp = get_thread_lwp (thread);
+ lwp = find_lwp_pid (pid_to_ptid (pid));
+ thread = get_lwp_thread (lwp);
+
+ if (debug_threads)
+ fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n",
+ lwpid_of (lwp), pid);
+
+ /* If we're killing a running inferior, make sure it is stopped
+ first, as PTRACE_KILL will not work otherwise. */
+ if (!lwp->stopped)
+ send_sigstop (&lwp->head);
+
do
{
- ptrace (PTRACE_KILL, pid_of (lwp), 0, 0);
+ ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0);
/* Make sure it died. The loop is most likely unnecessary. */
- wstat = linux_wait_for_event (thread);
- } while (WIFSTOPPED (wstat));
+ lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL);
+ } while (lwpid > 0 && WIFSTOPPED (wstat));
- clear_inferiors ();
- free (all_lwps.head);
- all_lwps.head = all_lwps.tail = NULL;
+ delete_lwp (lwp);
+ linux_remove_process (process, 0);
+ return 0;
}
-static void
-linux_detach_one_lwp (struct inferior_list_entry *entry)
+static int
+linux_detach_one_lwp (struct inferior_list_entry *entry, void *args)
{
struct thread_info *thread = (struct thread_info *) entry;
struct lwp_info *lwp = get_thread_lwp (thread);
+ int pid = * (int *) args;
+
+ if (ptid_get_pid (entry->id) != pid)
+ return 0;
+
+ /* If we're detaching from a running inferior, make sure it is
+ stopped first, as PTRACE_DETACH will not work otherwise. */
+ if (!lwp->stopped)
+ {
+ int lwpid = lwpid_of (lwp);
+
+ stopping_threads = 1;
+ send_sigstop (&lwp->head);
+
+ /* If this detects a new thread through a clone event, the new
+ thread is appended to the end of the lwp list, so we'll
+ eventually detach from it. */
+ wait_for_sigstop (&lwp->head);
+ stopping_threads = 0;
+
+ /* If LWP exits while we're trying to stop it, there's nothing
+ left to do. */
+ lwp = find_lwp_pid (pid_to_ptid (lwpid));
+ if (lwp == NULL)
+ return 0;
+ }
/* Make sure the process isn't stopped at a breakpoint that's
no longer there. */
to collect the SIGSTOP, but is fairly likely to. */
if (lwp->stop_expected)
{
+ int wstat;
/* Clear stop_expected, so that the SIGSTOP will be reported. */
lwp->stop_expected = 0;
if (lwp->stopped)
- linux_resume_one_lwp (&lwp->head, 0, 0, NULL);
- linux_wait_for_event (thread);
+ linux_resume_one_lwp (lwp, 0, 0, NULL);
+ linux_wait_for_event (lwp->head.id, &wstat, __WALL);
}
/* Flush any pending changes to the process's registers. */
get_lwp_thread (lwp));
/* Finally, let it resume. */
- ptrace (PTRACE_DETACH, pid_of (lwp), 0, 0);
+ ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0);
+
+ delete_lwp (lwp);
+ return 0;
}
static int
-linux_detach (void)
+any_thread_of (struct inferior_list_entry *entry, void *args)
{
+ int *pid_p = args;
+
+ if (ptid_get_pid (entry->id) == *pid_p)
+ return 1;
+
+ return 0;
+}
+
+static int
+linux_detach (int pid)
+{
+ struct process_info *process;
+
+ process = find_process_pid (pid);
+ if (process == NULL)
+ return -1;
+
+ current_inferior =
+ (struct thread_info *) find_inferior (&all_threads, any_thread_of, &pid);
+
delete_all_breakpoints ();
- for_each_inferior (&all_threads, linux_detach_one_lwp);
- clear_inferiors ();
- free (all_lwps.head);
- all_lwps.head = all_lwps.tail = NULL;
+ find_inferior (&all_threads, linux_detach_one_lwp, &pid);
+ linux_remove_process (process, 1);
return 0;
}
static void
-linux_join (void)
+linux_join (int pid)
{
- extern unsigned long signal_pid;
int status, ret;
+ struct process_info *process;
+
+ process = find_process_pid (pid);
+ if (process == NULL)
+ return;
do {
- ret = waitpid (signal_pid, &status, 0);
+ ret = my_waitpid (pid, &status, 0);
if (WIFEXITED (status) || WIFSIGNALED (status))
break;
} while (ret != -1 || errno != ECHILD);
/* Return nonzero if the given thread is still alive. */
static int
-linux_thread_alive (unsigned long lwpid)
+linux_thread_alive (ptid_t ptid)
{
- if (find_inferior_id (&all_threads, lwpid) != NULL)
- return 1;
+ struct lwp_info *lwp = find_lwp_pid (ptid);
+
+ /* We assume we always know if a thread exits. If a whole process
+ exited but we still haven't been able to report it to GDB, we'll
+ hold on to the last lwp of the dead process. */
+ if (lwp != NULL)
+ return !lwp->dead;
else
return 0;
}
if (debug_threads)
fprintf (stderr, "Checking for breakpoint in lwp %ld.\n",
- event_child->lwpid);
+ lwpid_of (event_child));
saved_inferior = current_inferior;
current_inferior = get_lwp_thread (event_child);
decrement. We go immediately from this function to resuming,
and can not safely call get_stop_pc () again. */
if (the_low_target.set_pc != NULL)
- (*the_low_target.set_pc) (stop_pc);
+ {
+ if (debug_threads)
+ fprintf (stderr, "Set pc to 0x%lx\n", (long) stop_pc);
+ (*the_low_target.set_pc) (stop_pc);
+ }
/* We consumed the pending SIGTRAP. */
event_child->pending_is_breakpoint = 0;
/* Return 1 if this lwp has an interesting status pending. This
function may silently resume an inferior lwp. */
static int
-status_pending_p (struct inferior_list_entry *entry, void *dummy)
+status_pending_p (struct inferior_list_entry *entry, void *arg)
{
struct lwp_info *lwp = (struct lwp_info *) entry;
+ ptid_t ptid = * (ptid_t *) arg;
- if (lwp->status_pending_p)
+ /* Check if we're only interested in events from a specific process
+ or its lwps. */
+ if (!ptid_equal (minus_one_ptid, ptid)
+ && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id))
+ return 0;
+
+ if (lwp->status_pending_p && !lwp->suspended)
if (check_removed_breakpoint (lwp))
{
/* This thread was stopped at a breakpoint, and the breakpoint
So instead of reporting the old SIGTRAP, pretend we got to
the breakpoint just after it was removed instead of just
before; resume the process. */
- linux_resume_one_lwp (&lwp->head, 0, 0, NULL);
+ linux_resume_one_lwp (lwp, 0, 0, NULL);
return 0;
}
- return lwp->status_pending_p;
+ return (lwp->status_pending_p && !lwp->suspended);
}
-static void
-linux_wait_for_lwp (struct lwp_info **childp, int *wstatp)
+static int
+same_lwp (struct inferior_list_entry *entry, void *data)
+{
+ ptid_t ptid = *(ptid_t *) data;
+ int lwp;
+
+ if (ptid_get_lwp (ptid) != 0)
+ lwp = ptid_get_lwp (ptid);
+ else
+ lwp = ptid_get_pid (ptid);
+
+ if (ptid_get_lwp (entry->id) == lwp)
+ return 1;
+
+ return 0;
+}
+
+struct lwp_info *
+find_lwp_pid (ptid_t ptid)
+{
+ return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid);
+}
+
+static struct lwp_info *
+linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options)
{
int ret;
int to_wait_for = -1;
+ struct lwp_info *child = NULL;
- if (*childp != NULL)
- to_wait_for = (*childp)->lwpid;
-
-retry:
- while (1)
- {
- ret = waitpid (to_wait_for, wstatp, WNOHANG);
+ if (debug_threads)
+ fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid));
- if (ret == -1)
- {
- if (errno != ECHILD)
- perror_with_name ("waitpid");
- }
- else if (ret > 0)
- break;
+ if (ptid_equal (ptid, minus_one_ptid))
+ to_wait_for = -1; /* any child */
+ else
+ to_wait_for = ptid_get_lwp (ptid); /* this lwp only */
- ret = waitpid (to_wait_for, wstatp, WNOHANG | __WCLONE);
+ options |= __WALL;
- if (ret == -1)
- {
- if (errno != ECHILD)
- perror_with_name ("waitpid (WCLONE)");
- }
- else if (ret > 0)
- break;
+retry:
- usleep (1000);
- }
+ ret = my_waitpid (to_wait_for, wstatp, options);
+ if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG)))
+ return NULL;
+ else if (ret == -1)
+ perror_with_name ("waitpid");
if (debug_threads
&& (!WIFSTOPPED (*wstatp)
&& WSTOPSIG (*wstatp) != 33)))
fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp);
- if (to_wait_for == -1)
- *childp = (struct lwp_info *) find_inferior_id (&all_lwps, ret);
+ child = find_lwp_pid (pid_to_ptid (ret));
/* If we didn't find a process, one of two things presumably happened:
- A process we started and then detached from has exited. Ignore it.
- A process we are controlling has forked and the new child's stop
was reported to us by the kernel. Save its PID. */
- if (*childp == NULL && WIFSTOPPED (*wstatp))
+ if (child == NULL && WIFSTOPPED (*wstatp))
{
add_pid_to_list (&stopped_pids, ret);
goto retry;
}
- else if (*childp == NULL)
+ else if (child == NULL)
goto retry;
- (*childp)->stopped = 1;
- (*childp)->pending_is_breakpoint = 0;
+ child->stopped = 1;
+ child->pending_is_breakpoint = 0;
- (*childp)->last_status = *wstatp;
+ child->last_status = *wstatp;
/* Architecture-specific setup after inferior is running.
This needs to happen after we have attached to the inferior
}
if (debug_threads
- && WIFSTOPPED (*wstatp))
+ && WIFSTOPPED (*wstatp)
+ && the_low_target.get_pc != NULL)
{
struct thread_info *saved_inferior = current_inferior;
+ CORE_ADDR pc;
+
current_inferior = (struct thread_info *)
- find_inferior_id (&all_threads, (*childp)->lwpid);
- /* For testing only; i386_stop_pc prints out a diagnostic. */
- if (the_low_target.get_pc != NULL)
- get_stop_pc ();
+ find_inferior_id (&all_threads, child->head.id);
+ pc = (*the_low_target.get_pc) ();
+ fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc);
current_inferior = saved_inferior;
}
+
+ return child;
}
+/* Wait for an event from child PID. If PID is -1, wait for any
+ child. Store the stop status through the status pointer WSTAT.
+ OPTIONS is passed to the waitpid call. Return 0 if no child stop
+ event was found and OPTIONS contains WNOHANG. Return the PID of
+ the stopped child otherwise. */
+
static int
-linux_wait_for_event (struct thread_info *child)
+linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options)
{
CORE_ADDR stop_pc;
- struct lwp_info *event_child;
- int wstat;
+ struct lwp_info *event_child = NULL;
int bp_status;
+ struct lwp_info *requested_child = NULL;
- /* Check for a process with a pending status. */
+ /* Check for a lwp with a pending status. */
/* It is possible that the user changed the pending task's registers since
it stopped. We correctly handle the change of PC if we hit a breakpoint
(in check_removed_breakpoint); signals should be reported anyway. */
- if (child == NULL)
+
+ if (ptid_equal (ptid, minus_one_ptid)
+ || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid))
{
event_child = (struct lwp_info *)
- find_inferior (&all_lwps, status_pending_p, NULL);
+ find_inferior (&all_lwps, status_pending_p, &ptid);
if (debug_threads && event_child)
- fprintf (stderr, "Got a pending child %ld\n", event_child->lwpid);
+ fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child));
}
else
{
- event_child = get_thread_lwp (child);
- if (event_child->status_pending_p
- && check_removed_breakpoint (event_child))
- event_child = NULL;
+ requested_child = find_lwp_pid (ptid);
+ if (requested_child->status_pending_p
+ && !check_removed_breakpoint (requested_child))
+ event_child = requested_child;
}
if (event_child != NULL)
{
- if (event_child->status_pending_p)
- {
- if (debug_threads)
- fprintf (stderr, "Got an event from pending child %ld (%04x)\n",
- event_child->lwpid, event_child->status_pending);
- wstat = event_child->status_pending;
- event_child->status_pending_p = 0;
- event_child->status_pending = 0;
- current_inferior = get_lwp_thread (event_child);
- return wstat;
- }
+ if (debug_threads)
+ fprintf (stderr, "Got an event from pending child %ld (%04x)\n",
+ lwpid_of (event_child), event_child->status_pending);
+ *wstat = event_child->status_pending;
+ event_child->status_pending_p = 0;
+ event_child->status_pending = 0;
+ current_inferior = get_lwp_thread (event_child);
+ return lwpid_of (event_child);
}
/* We only enter this loop if no process has a pending wait status. Thus
events. */
while (1)
{
- if (child == NULL)
- event_child = NULL;
- else
- event_child = get_thread_lwp (child);
+ event_child = linux_wait_for_lwp (ptid, wstat, options);
- linux_wait_for_lwp (&event_child, &wstat);
+ if ((options & WNOHANG) && event_child == NULL)
+ return 0;
if (event_child == NULL)
error ("event from unknown child");
- current_inferior = (struct thread_info *)
- find_inferior_id (&all_threads, event_child->lwpid);
+ current_inferior = get_lwp_thread (event_child);
/* Check for thread exit. */
- if (! WIFSTOPPED (wstat))
+ if (! WIFSTOPPED (*wstat))
{
if (debug_threads)
- fprintf (stderr, "LWP %ld exiting\n", event_child->head.id);
+ fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child));
/* If the last thread is exiting, just return. */
- if (all_threads.head == all_threads.tail)
- return wstat;
+ if (last_thread_of_process_p (current_inferior))
+ {
+ if (debug_threads)
+ fprintf (stderr, "LWP %ld is last lwp of process\n",
+ lwpid_of (event_child));
+ return lwpid_of (event_child);
+ }
- dead_thread_notify (thread_id_to_gdb_id (event_child->lwpid));
+ delete_lwp (event_child);
- remove_inferior (&all_lwps, &event_child->head);
- free (event_child);
- remove_thread (current_inferior);
- current_inferior = (struct thread_info *) all_threads.head;
+ if (!non_stop)
+ {
+ current_inferior = (struct thread_info *) all_threads.head;
+ if (debug_threads)
+ fprintf (stderr, "Current inferior is now %ld\n",
+ lwpid_of (get_thread_lwp (current_inferior)));
+ }
+ else
+ {
+ current_inferior = NULL;
+ if (debug_threads)
+ fprintf (stderr, "Current inferior is now <NULL>\n");
+ }
/* If we were waiting for this particular child to do something...
well, it did something. */
- if (child != NULL)
- return wstat;
+ if (requested_child != NULL)
+ return lwpid_of (event_child);
/* Wait for a more interesting event. */
continue;
}
- if (WIFSTOPPED (wstat)
- && WSTOPSIG (wstat) == SIGSTOP
+ if (event_child->must_set_ptrace_flags)
+ {
+ ptrace (PTRACE_SETOPTIONS, lwpid_of (event_child),
+ 0, PTRACE_O_TRACECLONE);
+ event_child->must_set_ptrace_flags = 0;
+ }
+
+ if (WIFSTOPPED (*wstat)
+ && WSTOPSIG (*wstat) == SIGSTOP
&& event_child->stop_expected)
{
if (debug_threads)
fprintf (stderr, "Expected stop.\n");
event_child->stop_expected = 0;
- linux_resume_one_lwp (&event_child->head,
- event_child->stepping, 0, NULL);
+ linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL);
continue;
}
- if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP
- && wstat >> 16 != 0)
+ if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP
+ && *wstat >> 16 != 0)
{
- handle_extended_wait (event_child, wstat);
+ handle_extended_wait (event_child, *wstat);
continue;
}
special handling to skip the signal handler. */
/* FIXME drow/2002-06-09: Get signal numbers from the inferior's
thread library? */
- if (WIFSTOPPED (wstat)
+ if (WIFSTOPPED (*wstat)
&& !event_child->stepping
&& (
#ifdef USE_THREAD_DB
- (thread_db_active && (WSTOPSIG (wstat) == __SIGRTMIN
- || WSTOPSIG (wstat) == __SIGRTMIN + 1))
+ (current_process ()->private->thread_db != NULL
+ && (WSTOPSIG (*wstat) == __SIGRTMIN
+ || WSTOPSIG (*wstat) == __SIGRTMIN + 1))
||
#endif
- (pass_signals[target_signal_from_host (WSTOPSIG (wstat))]
- && (WSTOPSIG (wstat) != SIGSTOP || !stopping_threads))))
+ (pass_signals[target_signal_from_host (WSTOPSIG (*wstat))]
+ && (WSTOPSIG (*wstat) != SIGSTOP || !stopping_threads))))
{
siginfo_t info, *info_p;
if (debug_threads)
fprintf (stderr, "Ignored signal %d for LWP %ld.\n",
- WSTOPSIG (wstat), event_child->head.id);
+ WSTOPSIG (*wstat), lwpid_of (event_child));
- if (ptrace (PTRACE_GETSIGINFO, event_child->lwpid, 0, &info) == 0)
+ if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0)
info_p = &info;
else
info_p = NULL;
- linux_resume_one_lwp (&event_child->head,
+ linux_resume_one_lwp (event_child,
event_child->stepping,
- WSTOPSIG (wstat), info_p);
+ WSTOPSIG (*wstat), info_p);
continue;
}
/* If this event was not handled above, and is not a SIGTRAP, report
it. */
- if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGTRAP)
- return wstat;
+ if (!WIFSTOPPED (*wstat) || WSTOPSIG (*wstat) != SIGTRAP)
+ return lwpid_of (event_child);
/* If this target does not support breakpoints, we simply report the
SIGTRAP; it's of no concern to us. */
if (the_low_target.get_pc == NULL)
- return wstat;
+ return lwpid_of (event_child);
stop_pc = get_stop_pc ();
event_child->bp_reinsert = 0;
/* Clear the single-stepping flag and SIGTRAP as we resume. */
- linux_resume_one_lwp (&event_child->head, 0, 0, NULL);
+ linux_resume_one_lwp (event_child, 0, 0, NULL);
continue;
}
Otherwise, call the target function to figure out where we need
our temporary breakpoint, create it, and continue executing this
process. */
+
+ /* NOTE: we're lifting breakpoints in non-stop mode. This
+ is currently only used for thread event breakpoints, so
+ it isn't that bad as long as we have PTRACE_EVENT_CLONE
+ events. */
if (bp_status == 2)
/* No need to reinsert. */
- linux_resume_one_lwp (&event_child->head, 0, 0, NULL);
+ linux_resume_one_lwp (event_child, 0, 0, NULL);
else if (the_low_target.breakpoint_reinsert_addr == NULL)
{
event_child->bp_reinsert = stop_pc;
uninsert_breakpoint (stop_pc);
- linux_resume_one_lwp (&event_child->head, 1, 0, NULL);
+ linux_resume_one_lwp (event_child, 1, 0, NULL);
}
else
{
reinsert_breakpoint_by_bp
(stop_pc, (*the_low_target.breakpoint_reinsert_addr) ());
- linux_resume_one_lwp (&event_child->head, 0, 0, NULL);
+ linux_resume_one_lwp (event_child, 0, 0, NULL);
}
continue;
fprintf (stderr, "Hit a non-gdbserver breakpoint.\n");
/* If we were single-stepping, we definitely want to report the
- SIGTRAP. The single-step operation has completed, so also
- clear the stepping flag; in general this does not matter,
- because the SIGTRAP will be reported to the client, which
- will give us a new action for this thread, but clear it for
- consistency anyway. It's safe to clear the stepping flag
- because the only consumer of get_stop_pc () after this point
- is check_removed_breakpoint, and pending_is_breakpoint is not
- set. It might be wiser to use a step_completed flag instead. */
+ SIGTRAP. Although the single-step operation has completed,
+ do not clear clear the stepping flag yet; we need to check it
+ in wait_for_sigstop. */
if (event_child->stepping)
- {
- event_child->stepping = 0;
- return wstat;
- }
+ return lwpid_of (event_child);
/* A SIGTRAP that we can't explain. It may have been a breakpoint.
Check if it is a breakpoint, and if so mark the process information
event_child->pending_stop_pc = stop_pc;
}
- return wstat;
+ return lwpid_of (event_child);
}
/* NOTREACHED */
return 0;
}
+static int
+linux_wait_for_event (ptid_t ptid, int *wstat, int options)
+{
+ ptid_t wait_ptid;
+
+ if (ptid_is_pid (ptid))
+ {
+ /* A request to wait for a specific tgid. This is not possible
+ with waitpid, so instead, we wait for any child, and leave
+ children we're not interested in right now with a pending
+ status to report later. */
+ wait_ptid = minus_one_ptid;
+ }
+ else
+ wait_ptid = ptid;
+
+ while (1)
+ {
+ int event_pid;
+
+ event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options);
+
+ if (event_pid > 0
+ && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid)
+ {
+ struct lwp_info *event_child = find_lwp_pid (pid_to_ptid (event_pid));
+
+ if (! WIFSTOPPED (*wstat))
+ mark_lwp_dead (event_child, *wstat);
+ else
+ {
+ event_child->status_pending_p = 1;
+ event_child->status_pending = *wstat;
+ }
+ }
+ else
+ return event_pid;
+ }
+}
+
/* Wait for process, returns status. */
-static unsigned char
-linux_wait (char *status)
+static ptid_t
+linux_wait_1 (ptid_t ptid,
+ struct target_waitstatus *ourstatus, int target_options)
{
int w;
- struct thread_info *child = NULL;
+ struct thread_info *thread = NULL;
+ struct lwp_info *lwp = NULL;
+ int options;
+ int pid;
+
+ /* Translate generic target options into linux options. */
+ options = __WALL;
+ if (target_options & TARGET_WNOHANG)
+ options |= WNOHANG;
retry:
+ ourstatus->kind = TARGET_WAITKIND_IGNORE;
+
/* If we were only supposed to resume one thread, only wait for
that thread - if it's still alive. If it died, however - which
can happen if we're coming from the thread death case below -
then we need to make sure we restart the other threads. We could
pick a thread at random or restart all; restarting all is less
arbitrary. */
- if (cont_thread != 0 && cont_thread != -1)
+ if (!non_stop
+ && !ptid_equal (cont_thread, null_ptid)
+ && !ptid_equal (cont_thread, minus_one_ptid))
{
- child = (struct thread_info *) find_inferior_id (&all_threads,
- cont_thread);
+ thread = (struct thread_info *) find_inferior_id (&all_threads,
+ cont_thread);
/* No stepping, no signal - unless one is pending already, of course. */
- if (child == NULL)
+ if (thread == NULL)
{
struct thread_resume resume_info;
- resume_info.thread = -1;
- resume_info.step = resume_info.sig = resume_info.leave_stopped = 0;
- linux_resume (&resume_info);
+ resume_info.thread = minus_one_ptid;
+ resume_info.kind = resume_continue;
+ resume_info.sig = 0;
+ linux_resume (&resume_info, 1);
}
+ else
+ ptid = cont_thread;
}
- w = linux_wait_for_event (child);
- stop_all_lwps ();
+ pid = linux_wait_for_event (ptid, &w, options);
+ if (pid == 0) /* only if TARGET_WNOHANG */
+ return null_ptid;
- if (must_set_ptrace_flags)
- {
- ptrace (PTRACE_SETOPTIONS, inferior_pid, 0, PTRACE_O_TRACECLONE);
- must_set_ptrace_flags = 0;
- }
+ lwp = get_thread_lwp (current_inferior);
/* If we are waiting for a particular child, and it exited,
linux_wait_for_event will return its exit status. Similarly if
Report the exit status of the last thread to exit. This matches
LinuxThreads' behavior. */
- if (all_threads.head == all_threads.tail)
+ if (last_thread_of_process_p (current_inferior))
{
- if (WIFEXITED (w))
- {
- fprintf (stderr, "\nChild exited with retcode = %x \n",
- WEXITSTATUS (w));
- *status = 'W';
- clear_inferiors ();
- free (all_lwps.head);
- all_lwps.head = all_lwps.tail = NULL;
- return WEXITSTATUS (w);
- }
- else if (!WIFSTOPPED (w))
+ if (WIFEXITED (w) || WIFSIGNALED (w))
{
- fprintf (stderr, "\nChild terminated with signal = %x \n",
- WTERMSIG (w));
- *status = 'X';
- clear_inferiors ();
- free (all_lwps.head);
- all_lwps.head = all_lwps.tail = NULL;
- return target_signal_from_host (WTERMSIG (w));
+ int pid = pid_of (lwp);
+ struct process_info *process = find_process_pid (pid);
+
+ delete_lwp (lwp);
+ linux_remove_process (process, 0);
+
+ current_inferior = NULL;
+
+ if (WIFEXITED (w))
+ {
+ ourstatus->kind = TARGET_WAITKIND_EXITED;
+ ourstatus->value.integer = WEXITSTATUS (w);
+
+ if (debug_threads)
+ fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
+ }
+ else
+ {
+ ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
+ ourstatus->value.sig = target_signal_from_host (WTERMSIG (w));
+
+ if (debug_threads)
+ fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
+
+ }
+
+ return pid_to_ptid (pid);
}
}
else
goto retry;
}
- *status = 'T';
- return target_signal_from_host (WSTOPSIG (w));
+ /* In all-stop, stop all threads. Be careful to only do this if
+ we're about to report an event to GDB. */
+ if (!non_stop)
+ stop_all_lwps ();
+
+ ourstatus->kind = TARGET_WAITKIND_STOPPED;
+
+ if (lwp->suspended && WSTOPSIG (w) == SIGSTOP)
+ {
+ /* A thread that has been requested to stop by GDB with vCont;t,
+ and it stopped cleanly, so report as SIG0. The use of
+ SIGSTOP is an implementation detail. */
+ ourstatus->value.sig = TARGET_SIGNAL_0;
+ }
+ else if (lwp->suspended && WSTOPSIG (w) != SIGSTOP)
+ {
+ /* A thread that has been requested to stop by GDB with vCont;t,
+ but, it stopped for other reasons. Set stop_expected so the
+ pending SIGSTOP is ignored and the LWP is resumed. */
+ lwp->stop_expected = 1;
+ ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w));
+ }
+ else
+ {
+ ourstatus->value.sig = target_signal_from_host (WSTOPSIG (w));
+ }
+
+ if (debug_threads)
+ fprintf (stderr, "linux_wait ret = %s, %d, %d\n",
+ target_pid_to_str (lwp->head.id),
+ ourstatus->kind,
+ ourstatus->value.sig);
+
+ return lwp->head.id;
+}
+
+/* Get rid of any pending event in the pipe. */
+static void
+async_file_flush (void)
+{
+ int ret;
+ char buf;
+
+ do
+ ret = read (linux_event_pipe[0], &buf, 1);
+ while (ret >= 0 || (ret == -1 && errno == EINTR));
+}
+
+/* Put something in the pipe, so the event loop wakes up. */
+static void
+async_file_mark (void)
+{
+ int ret;
+
+ async_file_flush ();
+
+ do
+ ret = write (linux_event_pipe[1], "+", 1);
+ while (ret == 0 || (ret == -1 && errno == EINTR));
+
+ /* Ignore EAGAIN. If the pipe is full, the event loop will already
+ be awakened anyway. */
+}
+
+static ptid_t
+linux_wait (ptid_t ptid,
+ struct target_waitstatus *ourstatus, int target_options)
+{
+ ptid_t event_ptid;
+
+ if (debug_threads)
+ fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid));
+
+ /* Flush the async file first. */
+ if (target_is_async_p ())
+ async_file_flush ();
+
+ event_ptid = linux_wait_1 (ptid, ourstatus, target_options);
+
+ /* If at least one stop was reported, there may be more. A single
+ SIGCHLD can signal more than one child stop. */
+ if (target_is_async_p ()
+ && (target_options & TARGET_WNOHANG) != 0
+ && !ptid_equal (event_ptid, null_ptid))
+ async_file_mark ();
+
+ return event_ptid;
}
-/* Send a signal to an LWP. For LinuxThreads, kill is enough; however, if
- thread groups are in use, we need to use tkill. */
+/* Send a signal to an LWP. */
static int
kill_lwp (unsigned long lwpid, int signo)
{
- static int tkill_failed;
+ /* Use tkill, if possible, in case we are using nptl threads. If tkill
+ fails, then we are not using nptl threads and we should be using kill. */
- errno = 0;
+#ifdef __NR_tkill
+ {
+ static int tkill_failed;
-#ifdef SYS_tkill
- if (!tkill_failed)
- {
- int ret = syscall (SYS_tkill, lwpid, signo);
- if (errno != ENOSYS)
- return ret;
- errno = 0;
- tkill_failed = 1;
- }
+ if (!tkill_failed)
+ {
+ int ret;
+
+ errno = 0;
+ ret = syscall (__NR_tkill, lwpid, signo);
+ if (errno != ENOSYS)
+ return ret;
+ tkill_failed = 1;
+ }
+ }
#endif
return kill (lwpid, signo);
send_sigstop (struct inferior_list_entry *entry)
{
struct lwp_info *lwp = (struct lwp_info *) entry;
+ int pid;
if (lwp->stopped)
return;
+ pid = lwpid_of (lwp);
+
/* If we already have a pending stop signal for this process, don't
send another. */
if (lwp->stop_expected)
{
if (debug_threads)
- fprintf (stderr, "Have pending sigstop for lwp %ld\n",
- lwp->lwpid);
+ fprintf (stderr, "Have pending sigstop for lwp %d\n", pid);
/* We clear the stop_expected flag so that wait_for_sigstop
will receive the SIGSTOP event (instead of silently resuming and
}
if (debug_threads)
- fprintf (stderr, "Sending sigstop to lwp %ld\n", lwp->head.id);
+ fprintf (stderr, "Sending sigstop to lwp %d\n", pid);
+
+ kill_lwp (pid, SIGSTOP);
+}
+
+static void
+mark_lwp_dead (struct lwp_info *lwp, int wstat)
+{
+ /* It's dead, really. */
+ lwp->dead = 1;
+
+ /* Store the exit status for later. */
+ lwp->status_pending_p = 1;
+ lwp->status_pending = wstat;
+
+ /* So that check_removed_breakpoint doesn't try to figure out if
+ this is stopped at a breakpoint. */
+ lwp->pending_is_breakpoint = 0;
- kill_lwp (lwp->head.id, SIGSTOP);
+ /* Prevent trying to stop it. */
+ lwp->stopped = 1;
+
+ /* No further stops are expected from a dead lwp. */
+ lwp->stop_expected = 0;
}
static void
wait_for_sigstop (struct inferior_list_entry *entry)
{
struct lwp_info *lwp = (struct lwp_info *) entry;
- struct thread_info *saved_inferior, *thread;
+ struct thread_info *saved_inferior;
int wstat;
- unsigned long saved_tid;
+ ptid_t saved_tid;
+ ptid_t ptid;
if (lwp->stopped)
return;
saved_inferior = current_inferior;
- saved_tid = ((struct inferior_list_entry *) saved_inferior)->id;
- thread = (struct thread_info *) find_inferior_id (&all_threads,
- lwp->lwpid);
- wstat = linux_wait_for_event (thread);
+ if (saved_inferior != NULL)
+ saved_tid = ((struct inferior_list_entry *) saved_inferior)->id;
+ else
+ saved_tid = null_ptid; /* avoid bogus unused warning */
+
+ ptid = lwp->head.id;
+
+ linux_wait_for_event (ptid, &wstat, __WALL);
/* If we stopped with a non-SIGSTOP signal, save it for later
and record the pending SIGSTOP. If the process exited, just
{
if (debug_threads)
fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n",
- lwp->lwpid, wstat);
- lwp->status_pending_p = 1;
- lwp->status_pending = wstat;
+ lwpid_of (lwp), wstat);
+
+ /* Do not leave a pending single-step finish to be reported to
+ the client. The client will give us a new action for this
+ thread, possibly a continue request --- otherwise, the client
+ would consider this pending SIGTRAP reported later a spurious
+ signal. */
+ if (WSTOPSIG (wstat) == SIGTRAP
+ && lwp->stepping
+ && !linux_stopped_by_watchpoint ())
+ {
+ if (debug_threads)
+ fprintf (stderr, " single-step SIGTRAP ignored\n");
+ }
+ else
+ {
+ lwp->status_pending_p = 1;
+ lwp->status_pending = wstat;
+ }
lwp->stop_expected = 1;
}
+ else if (!WIFSTOPPED (wstat))
+ {
+ if (debug_threads)
+ fprintf (stderr, "Process %ld exited while stopping LWPs\n",
+ lwpid_of (lwp));
+
+ /* Leave this status pending for the next time we're able to
+ report it. In the mean time, we'll report this lwp as dead
+ to GDB, so GDB doesn't try to read registers and memory from
+ it. */
+ mark_lwp_dead (lwp, wstat);
+ }
- if (linux_thread_alive (saved_tid))
+ if (saved_inferior == NULL || linux_thread_alive (saved_tid))
current_inferior = saved_inferior;
else
{
if (debug_threads)
fprintf (stderr, "Previously current thread died.\n");
- /* Set a valid thread as current. */
- set_desired_inferior (0);
+ if (non_stop)
+ {
+ /* We can't change the current inferior behind GDB's back,
+ otherwise, a subsequent command may apply to the wrong
+ process. */
+ current_inferior = NULL;
+ }
+ else
+ {
+ /* Set a valid thread as current. */
+ set_desired_inferior (0);
+ }
}
}
If SIGNAL is nonzero, give it that signal. */
static void
-linux_resume_one_lwp (struct inferior_list_entry *entry,
+linux_resume_one_lwp (struct lwp_info *lwp,
int step, int signal, siginfo_t *info)
{
- struct lwp_info *lwp = (struct lwp_info *) entry;
struct thread_info *saved_inferior;
if (lwp->stopped == 0)
if (debug_threads)
fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n",
- inferior_pid, step ? "step" : "continue", signal,
+ lwpid_of (lwp), step ? "step" : "continue", signal,
lwp->stop_expected ? "expected" : "not expected");
/* This bit needs some thinking about. If we get a signal that
if (debug_threads && the_low_target.get_pc != NULL)
{
- fprintf (stderr, " ");
- (*the_low_target.get_pc) ();
+ CORE_ADDR pc = (*the_low_target.get_pc) ();
+ fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc);
}
/* If we have pending signals, consume one unless we are trying to reinsert
signal = (*p_sig)->signal;
if ((*p_sig)->info.si_signo != 0)
- ptrace (PTRACE_SETSIGINFO, lwp->lwpid, 0, &(*p_sig)->info);
+ ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info);
free (*p_sig);
*p_sig = NULL;
}
+ if (the_low_target.prepare_to_resume != NULL)
+ the_low_target.prepare_to_resume (lwp);
+
regcache_invalidate_one ((struct inferior_list_entry *)
get_lwp_thread (lwp));
errno = 0;
lwp->stopped = 0;
lwp->stepping = step;
- ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwp->lwpid, 0, signal);
+ ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), 0, signal);
current_inferior = saved_inferior;
if (errno)
}
}
-static struct thread_resume *resume_ptr;
+struct thread_resume_array
+{
+ struct thread_resume *resume;
+ size_t n;
+};
/* This function is called once per thread. We look up the thread
in RESUME_PTR, and mark the thread with a pointer to the appropriate
This algorithm is O(threads * resume elements), but resume elements
is small (and will remain small at least until GDB supports thread
suspension). */
-static void
-linux_set_resume_request (struct inferior_list_entry *entry)
+static int
+linux_set_resume_request (struct inferior_list_entry *entry, void *arg)
{
struct lwp_info *lwp;
struct thread_info *thread;
int ndx;
+ struct thread_resume_array *r;
thread = (struct thread_info *) entry;
lwp = get_thread_lwp (thread);
+ r = arg;
+
+ for (ndx = 0; ndx < r->n; ndx++)
+ {
+ ptid_t ptid = r->resume[ndx].thread;
+ if (ptid_equal (ptid, minus_one_ptid)
+ || ptid_equal (ptid, entry->id)
+ || (ptid_is_pid (ptid)
+ && (ptid_get_pid (ptid) == pid_of (lwp)))
+ || (ptid_get_lwp (ptid) == -1
+ && (ptid_get_pid (ptid) == pid_of (lwp))))
+ {
+ lwp->resume = &r->resume[ndx];
+ return 0;
+ }
+ }
- ndx = 0;
- while (resume_ptr[ndx].thread != -1 && resume_ptr[ndx].thread != entry->id)
- ndx++;
+ /* No resume action for this thread. */
+ lwp->resume = NULL;
- lwp->resume = &resume_ptr[ndx];
+ return 0;
}
-/* This function is called once per thread. We check the thread's resume
- request, which will tell us whether to resume, step, or leave the thread
- stopped; and what signal, if any, it should be sent. For threads which
- we aren't explicitly told otherwise, we preserve the stepping flag; this
- is used for stepping over gdbserver-placed breakpoints. */
-static void
-linux_continue_one_thread (struct inferior_list_entry *entry)
+/* Set *FLAG_P if this lwp has an interesting status pending. */
+static int
+resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p)
{
- struct lwp_info *lwp;
- struct thread_info *thread;
- int step;
-
- thread = (struct thread_info *) entry;
- lwp = get_thread_lwp (thread);
+ struct lwp_info *lwp = (struct lwp_info *) entry;
- if (lwp->resume->leave_stopped)
- return;
+ /* LWPs which will not be resumed are not interesting, because
+ we might not wait for them next time through linux_wait. */
+ if (lwp->resume == NULL)
+ return 0;
- if (lwp->resume->thread == -1)
- step = lwp->stepping || lwp->resume->step;
- else
- step = lwp->resume->step;
+ /* If this thread has a removed breakpoint, we won't have any
+ events to report later, so check now. check_removed_breakpoint
+ may clear status_pending_p. We avoid calling check_removed_breakpoint
+ for any thread that we are not otherwise going to resume - this
+ lets us preserve stopped status when two threads hit a breakpoint.
+ GDB removes the breakpoint to single-step a particular thread
+ past it, then re-inserts it and resumes all threads. We want
+ to report the second thread without resuming it in the interim. */
+ if (lwp->status_pending_p)
+ check_removed_breakpoint (lwp);
- linux_resume_one_lwp (&lwp->head, step, lwp->resume->sig, NULL);
+ if (lwp->status_pending_p)
+ * (int *) flag_p = 1;
- lwp->resume = NULL;
+ return 0;
}
/* This function is called once per thread. We check the thread's resume
request, which will tell us whether to resume, step, or leave the thread
- stopped; and what signal, if any, it should be sent. We queue any needed
- signals, since we won't actually resume. We already have a pending event
- to report, so we don't need to preserve any step requests; they should
- be re-issued if necessary. */
+ stopped; and what signal, if any, it should be sent.
-static void
-linux_queue_one_thread (struct inferior_list_entry *entry)
+ For threads which we aren't explicitly told otherwise, we preserve
+ the stepping flag; this is used for stepping over gdbserver-placed
+ breakpoints.
+
+ If pending_flags was set in any thread, we queue any needed
+ signals, since we won't actually resume. We already have a pending
+ event to report, so we don't need to preserve any step requests;
+ they should be re-issued if necessary. */
+
+static int
+linux_resume_one_thread (struct inferior_list_entry *entry, void *arg)
{
struct lwp_info *lwp;
struct thread_info *thread;
+ int step;
+ int pending_flag = * (int *) arg;
thread = (struct thread_info *) entry;
lwp = get_thread_lwp (thread);
- if (lwp->resume->leave_stopped)
- return;
+ if (lwp->resume == NULL)
+ return 0;
- /* If we have a new signal, enqueue the signal. */
- if (lwp->resume->sig != 0)
+ if (lwp->resume->kind == resume_stop)
{
- struct pending_signals *p_sig;
- p_sig = xmalloc (sizeof (*p_sig));
- p_sig->prev = lwp->pending_signals;
- p_sig->signal = lwp->resume->sig;
- memset (&p_sig->info, 0, sizeof (siginfo_t));
+ if (debug_threads)
+ fprintf (stderr, "suspending LWP %ld\n", lwpid_of (lwp));
- /* If this is the same signal we were previously stopped by,
- make sure to queue its siginfo. We can ignore the return
- value of ptrace; if it fails, we'll skip
- PTRACE_SETSIGINFO. */
- if (WIFSTOPPED (lwp->last_status)
- && WSTOPSIG (lwp->last_status) == lwp->resume->sig)
- ptrace (PTRACE_GETSIGINFO, lwp->lwpid, 0, &p_sig->info);
+ if (!lwp->stopped)
+ {
+ if (debug_threads)
+ fprintf (stderr, "running -> suspending LWP %ld\n", lwpid_of (lwp));
- lwp->pending_signals = p_sig;
+ lwp->suspended = 1;
+ send_sigstop (&lwp->head);
+ }
+ else
+ {
+ if (debug_threads)
+ {
+ if (lwp->suspended)
+ fprintf (stderr, "already stopped/suspended LWP %ld\n",
+ lwpid_of (lwp));
+ else
+ fprintf (stderr, "already stopped/not suspended LWP %ld\n",
+ lwpid_of (lwp));
+ }
+
+ /* Make sure we leave the LWP suspended, so we don't try to
+ resume it without GDB telling us to. FIXME: The LWP may
+ have been stopped in an internal event that was not meant
+ to be notified back to GDB (e.g., gdbserver breakpoint),
+ so we should be reporting a stop event in that case
+ too. */
+ lwp->suspended = 1;
+ }
+
+ /* For stop requests, we're done. */
+ lwp->resume = NULL;
+ return 0;
}
+ else
+ lwp->suspended = 0;
- lwp->resume = NULL;
-}
+ /* If this thread which is about to be resumed has a pending status,
+ then don't resume any threads - we can just report the pending
+ status. Make sure to queue any signals that would otherwise be
+ sent. In all-stop mode, we do this decision based on if *any*
+ thread has a pending status. */
+ if (non_stop)
+ resume_status_pending_p (&lwp->head, &pending_flag);
-/* Set DUMMY if this process has an interesting status pending. */
-static int
-resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p)
-{
- struct lwp_info *lwp = (struct lwp_info *) entry;
+ if (!pending_flag)
+ {
+ if (debug_threads)
+ fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp));
- /* Processes which will not be resumed are not interesting, because
- we might not wait for them next time through linux_wait. */
- if (lwp->resume->leave_stopped)
- return 0;
+ if (ptid_equal (lwp->resume->thread, minus_one_ptid)
+ && lwp->stepping
+ && lwp->pending_is_breakpoint)
+ step = 1;
+ else
+ step = (lwp->resume->kind == resume_step);
- /* If this thread has a removed breakpoint, we won't have any
- events to report later, so check now. check_removed_breakpoint
- may clear status_pending_p. We avoid calling check_removed_breakpoint
- for any thread that we are not otherwise going to resume - this
- lets us preserve stopped status when two threads hit a breakpoint.
- GDB removes the breakpoint to single-step a particular thread
- past it, then re-inserts it and resumes all threads. We want
- to report the second thread without resuming it in the interim. */
- if (lwp->status_pending_p)
- check_removed_breakpoint (lwp);
+ linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL);
+ }
+ else
+ {
+ if (debug_threads)
+ fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp));
- if (lwp->status_pending_p)
- * (int *) flag_p = 1;
+ /* If we have a new signal, enqueue the signal. */
+ if (lwp->resume->sig != 0)
+ {
+ struct pending_signals *p_sig;
+ p_sig = xmalloc (sizeof (*p_sig));
+ p_sig->prev = lwp->pending_signals;
+ p_sig->signal = lwp->resume->sig;
+ memset (&p_sig->info, 0, sizeof (siginfo_t));
+
+ /* If this is the same signal we were previously stopped by,
+ make sure to queue its siginfo. We can ignore the return
+ value of ptrace; if it fails, we'll skip
+ PTRACE_SETSIGINFO. */
+ if (WIFSTOPPED (lwp->last_status)
+ && WSTOPSIG (lwp->last_status) == lwp->resume->sig)
+ ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info);
+
+ lwp->pending_signals = p_sig;
+ }
+ }
+ lwp->resume = NULL;
return 0;
}
static void
-linux_resume (struct thread_resume *resume_info)
+linux_resume (struct thread_resume *resume_info, size_t n)
{
int pending_flag;
+ struct thread_resume_array array = { resume_info, n };
- /* Yes, the use of a global here is rather ugly. */
- resume_ptr = resume_info;
-
- for_each_inferior (&all_threads, linux_set_resume_request);
+ find_inferior (&all_threads, linux_set_resume_request, &array);
/* If there is a thread which would otherwise be resumed, which
has a pending status, then don't resume any threads - we can just
report the pending status. Make sure to queue any signals
- that would otherwise be sent. */
+ that would otherwise be sent. In non-stop mode, we'll apply this
+ logic to each thread individually. */
pending_flag = 0;
- find_inferior (&all_lwps, resume_status_pending_p, &pending_flag);
+ if (!non_stop)
+ find_inferior (&all_lwps, resume_status_pending_p, &pending_flag);
if (debug_threads)
{
fprintf (stderr, "Resuming, no pending status\n");
}
- if (pending_flag)
- for_each_inferior (&all_threads, linux_queue_one_thread);
- else
- for_each_inferior (&all_threads, linux_continue_one_thread);
+ find_inferior (&all_threads, linux_resume_one_thread, &pending_flag);
}
#ifdef HAVE_LINUX_USRREGS
CORE_ADDR regaddr;
int i, size;
char *buf;
+ int pid;
if (regno >= the_low_target.num_regs)
return;
regaddr = register_addr (regno);
if (regaddr == -1)
return;
+
+ pid = lwpid_of (get_thread_lwp (current_inferior));
size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1)
& - sizeof (PTRACE_XFER_TYPE));
buf = alloca (size);
{
errno = 0;
*(PTRACE_XFER_TYPE *) (buf + i) =
- ptrace (PTRACE_PEEKUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, 0);
+ ptrace (PTRACE_PEEKUSER, pid, (PTRACE_ARG3_TYPE) regaddr, 0);
regaddr += sizeof (PTRACE_XFER_TYPE);
if (errno != 0)
{
static void
usr_fetch_inferior_registers (int regno)
{
- if (regno == -1 || regno == 0)
+ if (regno == -1)
for (regno = 0; regno < the_low_target.num_regs; regno++)
fetch_register (regno);
else
CORE_ADDR regaddr;
int i, size;
char *buf;
+ int pid;
if (regno >= 0)
{
else
collect_register (regno, buf);
+ pid = lwpid_of (get_thread_lwp (current_inferior));
for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE))
{
errno = 0;
- ptrace (PTRACE_POKEUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
+ ptrace (PTRACE_POKEUSER, pid, (PTRACE_ARG3_TYPE) regaddr,
*(PTRACE_XFER_TYPE *) (buf + i));
if (errno != 0)
{
{
struct regset_info *regset;
int saw_general_regs = 0;
+ int pid;
regset = target_regsets;
+ pid = lwpid_of (get_thread_lwp (current_inferior));
while (regset->size >= 0)
{
void *buf;
buf = xmalloc (regset->size);
#ifndef __sparc__
- res = ptrace (regset->get_request, inferior_pid, 0, buf);
+ res = ptrace (regset->get_request, pid, 0, buf);
#else
- res = ptrace (regset->get_request, inferior_pid, buf, 0);
+ res = ptrace (regset->get_request, pid, buf, 0);
#endif
if (res < 0)
{
/* If we get EIO on a regset, do not try it again for
this process. */
disabled_regsets[regset - target_regsets] = 1;
+ free (buf);
continue;
}
else
{
char s[256];
- sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%ld",
- inferior_pid);
+ sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d",
+ pid);
perror (s);
}
}
saw_general_regs = 1;
regset->store_function (buf);
regset ++;
+ free (buf);
}
if (saw_general_regs)
return 0;
{
struct regset_info *regset;
int saw_general_regs = 0;
+ int pid;
regset = target_regsets;
+ pid = lwpid_of (get_thread_lwp (current_inferior));
while (regset->size >= 0)
{
void *buf;
in case there are any items in the kernel's regset that are
not in gdbserver's regcache. */
#ifndef __sparc__
- res = ptrace (regset->get_request, inferior_pid, 0, buf);
+ res = ptrace (regset->get_request, pid, 0, buf);
#else
- res = ptrace (regset->get_request, inferior_pid, buf, 0);
+ res = ptrace (regset->get_request, pid, buf, 0);
#endif
if (res == 0)
/* Only now do we write the register set. */
#ifndef __sparc__
- res = ptrace (regset->set_request, inferior_pid, 0, buf);
+ res = ptrace (regset->set_request, pid, 0, buf);
#else
- res = ptrace (regset->set_request, inferior_pid, buf, 0);
+ res = ptrace (regset->set_request, pid, buf, 0);
#endif
}
/* If we get EIO on a regset, do not try it again for
this process. */
disabled_regsets[regset - target_regsets] = 1;
+ free (buf);
continue;
}
else if (errno == ESRCH)
already gone, in which case we simply ignore attempts
to change its registers. See also the related
comment in linux_resume_one_lwp. */
+ free (buf);
return 0;
}
else
= (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
int fd;
char filename[64];
+ int pid = lwpid_of (get_thread_lwp (current_inferior));
/* Try using /proc. Don't bother for one word. */
if (len >= 3 * sizeof (long))
{
/* We could keep this file open and cache it - possibly one per
thread. That requires some juggling, but is even faster. */
- sprintf (filename, "/proc/%ld/mem", inferior_pid);
+ sprintf (filename, "/proc/%d/mem", pid);
fd = open (filename, O_RDONLY | O_LARGEFILE);
if (fd == -1)
goto no_proc;
#ifdef HAVE_PREAD64
if (pread64 (fd, myaddr, len, memaddr) != len)
#else
- if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, memaddr, len) != len)
+ if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, myaddr, len) != len)
#endif
{
close (fd);
for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
{
errno = 0;
- buffer[i] = ptrace (PTRACE_PEEKTEXT, inferior_pid,
- (PTRACE_ARG3_TYPE) addr, 0);
+ buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0);
if (errno)
return errno;
}
= (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE);
/* Allocate buffer of that many longwords. */
register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
+ int pid = lwpid_of (get_thread_lwp (current_inferior));
if (debug_threads)
{
- fprintf (stderr, "Writing %02x to %08lx\n", (unsigned)myaddr[0], (long)memaddr);
+ /* Dump up to four bytes. */
+ unsigned int val = * (unsigned int *) myaddr;
+ if (len == 1)
+ val = val & 0xff;
+ else if (len == 2)
+ val = val & 0xffff;
+ else if (len == 3)
+ val = val & 0xffffff;
+ fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4),
+ val, (long)memaddr);
}
/* Fill start and end extra bytes of buffer with existing memory data. */
- buffer[0] = ptrace (PTRACE_PEEKTEXT, inferior_pid,
- (PTRACE_ARG3_TYPE) addr, 0);
+ buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, (PTRACE_ARG3_TYPE) addr, 0);
if (count > 1)
{
buffer[count - 1]
- = ptrace (PTRACE_PEEKTEXT, inferior_pid,
+ = ptrace (PTRACE_PEEKTEXT, pid,
(PTRACE_ARG3_TYPE) (addr + (count - 1)
* sizeof (PTRACE_XFER_TYPE)),
0);
for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
{
errno = 0;
- ptrace (PTRACE_POKETEXT, inferior_pid, (PTRACE_ARG3_TYPE) addr, buffer[i]);
+ ptrace (PTRACE_POKETEXT, pid, (PTRACE_ARG3_TYPE) addr, buffer[i]);
if (errno)
return errno;
}
_exit (0);
}
-/* Wrapper function for waitpid which handles EINTR. */
-
-static int
-my_waitpid (int pid, int *status, int flags)
-{
- int ret;
- do
- {
- ret = waitpid (pid, status, flags);
- }
- while (ret == -1 && errno == EINTR);
-
- return ret;
-}
-
/* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make
sure that we can enable the option, and that it had the desired
effect. */
linux_look_up_symbols (void)
{
#ifdef USE_THREAD_DB
- if (thread_db_active)
+ struct process_info *proc = current_process ();
+
+ if (proc->private->thread_db != NULL)
return;
- thread_db_active = thread_db_init (!linux_supports_tracefork_flag);
+ thread_db_init (!linux_supports_tracefork_flag);
#endif
}
{
extern unsigned long signal_pid;
- if (cont_thread != 0 && cont_thread != -1)
+ if (!ptid_equal (cont_thread, null_ptid)
+ && !ptid_equal (cont_thread, minus_one_ptid))
{
struct lwp_info *lwp;
+ int lwpid;
lwp = get_thread_lwp (current_inferior);
- kill_lwp (lwp->lwpid, SIGINT);
+ lwpid = lwpid_of (lwp);
+ kill_lwp (lwpid, SIGINT);
}
else
kill_lwp (signal_pid, SIGINT);
{
char filename[PATH_MAX];
int fd, n;
+ int pid = lwpid_of (get_thread_lwp (current_inferior));
- snprintf (filename, sizeof filename, "/proc/%ld/auxv", inferior_pid);
+ snprintf (filename, sizeof filename, "/proc/%d/auxv", pid);
fd = open (filename, O_RDONLY);
if (fd < 0)
return n;
}
-/* These watchpoint related wrapper functions simply pass on the function call
- if the target has registered a corresponding function. */
+/* These breakpoint and watchpoint related wrapper functions simply
+ pass on the function call if the target has registered a
+ corresponding function. */
static int
-linux_insert_watchpoint (char type, CORE_ADDR addr, int len)
+linux_insert_point (char type, CORE_ADDR addr, int len)
{
- if (the_low_target.insert_watchpoint != NULL)
- return the_low_target.insert_watchpoint (type, addr, len);
+ if (the_low_target.insert_point != NULL)
+ return the_low_target.insert_point (type, addr, len);
else
/* Unsupported (see target.h). */
return 1;
}
static int
-linux_remove_watchpoint (char type, CORE_ADDR addr, int len)
+linux_remove_point (char type, CORE_ADDR addr, int len)
{
- if (the_low_target.remove_watchpoint != NULL)
- return the_low_target.remove_watchpoint (type, addr, len);
+ if (the_low_target.remove_point != NULL)
+ return the_low_target.remove_point (type, addr, len);
else
/* Unsupported (see target.h). */
return 1;
{
#if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR)
unsigned long text, text_end, data;
- int pid = get_thread_lwp (current_inferior)->head.id;
+ int pid = lwpid_of (get_thread_lwp (current_inferior));
errno = 0;
return len;
}
+/* Convert a native/host siginfo object, into/from the siginfo in the
+ layout of the inferiors' architecture. */
+
+static void
+siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction)
+{
+ int done = 0;
+
+ if (the_low_target.siginfo_fixup != NULL)
+ done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction);
+
+ /* If there was no callback, or the callback didn't do anything,
+ then just do a straight memcpy. */
+ if (!done)
+ {
+ if (direction == 1)
+ memcpy (siginfo, inf_siginfo, sizeof (struct siginfo));
+ else
+ memcpy (inf_siginfo, siginfo, sizeof (struct siginfo));
+ }
+}
+
static int
linux_xfer_siginfo (const char *annex, unsigned char *readbuf,
unsigned const char *writebuf, CORE_ADDR offset, int len)
{
+ int pid;
struct siginfo siginfo;
- long pid = -1;
+ char inf_siginfo[sizeof (struct siginfo)];
if (current_inferior == NULL)
return -1;
- pid = pid_of (get_thread_lwp (current_inferior));
+ pid = lwpid_of (get_thread_lwp (current_inferior));
if (debug_threads)
- fprintf (stderr, "%s siginfo for lwp %ld.\n",
+ fprintf (stderr, "%s siginfo for lwp %d.\n",
readbuf != NULL ? "Reading" : "Writing",
pid);
if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0)
return -1;
+ /* When GDBSERVER is built as a 64-bit application, ptrace writes into
+ SIGINFO an object with 64-bit layout. Since debugging a 32-bit
+ inferior with a 64-bit GDBSERVER should look the same as debugging it
+ with a 32-bit GDBSERVER, we need to convert it. */
+ siginfo_fixup (&siginfo, inf_siginfo, 0);
+
if (offset + len > sizeof (siginfo))
len = sizeof (siginfo) - offset;
if (readbuf != NULL)
- memcpy (readbuf, (char *) &siginfo + offset, len);
+ memcpy (readbuf, inf_siginfo + offset, len);
else
{
- memcpy ((char *) &siginfo + offset, writebuf, len);
+ memcpy (inf_siginfo + offset, writebuf, len);
+
+ /* Convert back to ptrace layout before flushing it out. */
+ siginfo_fixup (&siginfo, inf_siginfo, 1);
+
if (ptrace (PTRACE_SETSIGINFO, pid, 0, &siginfo) != 0)
return -1;
}
return len;
}
+/* SIGCHLD handler that serves two purposes: In non-stop/async mode,
+ so we notice when children change state; as the handler for the
+ sigsuspend in my_waitpid. */
+
+static void
+sigchld_handler (int signo)
+{
+ int old_errno = errno;
+
+ if (debug_threads)
+ /* fprintf is not async-signal-safe, so call write directly. */
+ write (2, "sigchld_handler\n", sizeof ("sigchld_handler\n") - 1);
+
+ if (target_is_async_p ())
+ async_file_mark (); /* trigger a linux_wait */
+
+ errno = old_errno;
+}
+
+static int
+linux_supports_non_stop (void)
+{
+ return 1;
+}
+
+static int
+linux_async (int enable)
+{
+ int previous = (linux_event_pipe[0] != -1);
+
+ if (previous != enable)
+ {
+ sigset_t mask;
+ sigemptyset (&mask);
+ sigaddset (&mask, SIGCHLD);
+
+ sigprocmask (SIG_BLOCK, &mask, NULL);
+
+ if (enable)
+ {
+ if (pipe (linux_event_pipe) == -1)
+ fatal ("creating event pipe failed.");
+
+ fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK);
+ fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK);
+
+ /* Register the event loop handler. */
+ add_file_handler (linux_event_pipe[0],
+ handle_target_event, NULL);
+
+ /* Always trigger a linux_wait. */
+ async_file_mark ();
+ }
+ else
+ {
+ delete_file_handler (linux_event_pipe[0]);
+
+ close (linux_event_pipe[0]);
+ close (linux_event_pipe[1]);
+ linux_event_pipe[0] = -1;
+ linux_event_pipe[1] = -1;
+ }
+
+ sigprocmask (SIG_UNBLOCK, &mask, NULL);
+ }
+
+ return previous;
+}
+
+static int
+linux_start_non_stop (int nonstop)
+{
+ /* Register or unregister from event-loop accordingly. */
+ linux_async (nonstop);
+ return 0;
+}
+
+static int
+linux_supports_multi_process (void)
+{
+ return 1;
+}
+
+
+/* Enumerate spufs IDs for process PID. */
+static int
+spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len)
+{
+ int pos = 0;
+ int written = 0;
+ char path[128];
+ DIR *dir;
+ struct dirent *entry;
+
+ sprintf (path, "/proc/%ld/fd", pid);
+ dir = opendir (path);
+ if (!dir)
+ return -1;
+
+ rewinddir (dir);
+ while ((entry = readdir (dir)) != NULL)
+ {
+ struct stat st;
+ struct statfs stfs;
+ int fd;
+
+ fd = atoi (entry->d_name);
+ if (!fd)
+ continue;
+
+ sprintf (path, "/proc/%ld/fd/%d", pid, fd);
+ if (stat (path, &st) != 0)
+ continue;
+ if (!S_ISDIR (st.st_mode))
+ continue;
+
+ if (statfs (path, &stfs) != 0)
+ continue;
+ if (stfs.f_type != SPUFS_MAGIC)
+ continue;
+
+ if (pos >= offset && pos + 4 <= offset + len)
+ {
+ *(unsigned int *)(buf + pos - offset) = fd;
+ written += 4;
+ }
+ pos += 4;
+ }
+
+ closedir (dir);
+ return written;
+}
+
+/* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU
+ object type, using the /proc file system. */
+static int
+linux_qxfer_spu (const char *annex, unsigned char *readbuf,
+ unsigned const char *writebuf,
+ CORE_ADDR offset, int len)
+{
+ long pid = lwpid_of (get_thread_lwp (current_inferior));
+ char buf[128];
+ int fd = 0;
+ int ret = 0;
+
+ if (!writebuf && !readbuf)
+ return -1;
+
+ if (!*annex)
+ {
+ if (!readbuf)
+ return -1;
+ else
+ return spu_enumerate_spu_ids (pid, readbuf, offset, len);
+ }
+
+ sprintf (buf, "/proc/%ld/fd/%s", pid, annex);
+ fd = open (buf, writebuf? O_WRONLY : O_RDONLY);
+ if (fd <= 0)
+ return -1;
+
+ if (offset != 0
+ && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset)
+ {
+ close (fd);
+ return 0;
+ }
+
+ if (writebuf)
+ ret = write (fd, writebuf, (size_t) len);
+ else
+ ret = read (fd, readbuf, (size_t) len);
+
+ close (fd);
+ return ret;
+}
+
static struct target_ops linux_target_ops = {
linux_create_inferior,
linux_attach,
linux_look_up_symbols,
linux_request_interrupt,
linux_read_auxv,
- linux_insert_watchpoint,
- linux_remove_watchpoint,
+ linux_insert_point,
+ linux_remove_point,
linux_stopped_by_watchpoint,
linux_stopped_data_address,
#if defined(__UCLIBC__) && defined(HAS_NOMMU)
#else
NULL,
#endif
- NULL,
+ linux_qxfer_spu,
hostio_last_error_from_errno,
linux_qxfer_osdata,
linux_xfer_siginfo,
+ linux_supports_non_stop,
+ linux_async,
+ linux_start_non_stop,
+ linux_supports_multi_process,
+#ifdef USE_THREAD_DB
+ thread_db_handle_monitor_command
+#else
+ NULL
+#endif
};
static void
void
initialize_low (void)
{
- thread_db_active = 0;
+ struct sigaction sigchld_action;
+ memset (&sigchld_action, 0, sizeof (sigchld_action));
set_target_ops (&linux_target_ops);
set_breakpoint_data (the_low_target.breakpoint,
the_low_target.breakpoint_len);
;
disabled_regsets = xmalloc (num_regsets);
#endif
+
+ sigchld_action.sa_handler = sigchld_handler;
+ sigemptyset (&sigchld_action.sa_mask);
+ sigchld_action.sa_flags = SA_RESTART;
+ sigaction (SIGCHLD, &sigchld_action, NULL);
}
projects / deliverable / binutils-gdb.git / blobdiff