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Diffstat (limited to 'gdb/gnu-nat.c')
| -rw-r--r-- | gdb/gnu-nat.c | 2814 |
1 files changed, 2814 insertions, 0 deletions
diff --git a/gdb/gnu-nat.c b/gdb/gnu-nat.c new file mode 100644 index 0000000..2d9cbed --- /dev/null +++ b/gdb/gnu-nat.c @@ -0,0 +1,2814 @@ +/* Interface GDB to the GNU Hurd + Copyright (C) 1992, 1995, 1996 Free Software Foundation, Inc. + + This file is part of GDB. + + Written by Miles Bader <miles@gnu.ai.mit.edu> + + Some code and ideas from m3-nat.c by Jukka Virtanen <jtv@hut.fi> + + 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 2 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, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. +*/ + +#include <stdio.h> +#include <errno.h> +#include <signal.h> +#include <assert.h> +#include <setjmp.h> +#include <limits.h> +#include <sys/ptrace.h> + +/* We include this because we don't need the access macros and they conflict + with gdb's definitions (ick). This is very non standard! */ +#include <waitflags.h> + +#include <mach.h> +#include <mach/message.h> +#include <mach/notify.h> +#include <mach_error.h> +#include <mach/exception.h> +#include <mach/vm_attributes.h> + +#include <hurd/process.h> +#include <hurd/process_request.h> +#include <hurd/msg.h> +#include <hurd/msg_request.h> +#include <hurd/signal.h> +#include <hurd/interrupt.h> +#include <hurd/sigpreempt.h> + +#include "defs.h" +#include "inferior.h" +#include "symtab.h" +#include "value.h" +#include "language.h" +#include "target.h" +#include "wait.h" +#include "gdbcmd.h" +#include "gdbcore.h" + +#include "gnu-nat.h" + +#include "exc_request_S.h" +#include "notify_S.h" +#include "process_reply_S.h" +#include "msg_reply_S.h" + +#include "exc_request_U.h" +#include "msg_U.h" + +static process_t proc_server = MACH_PORT_NULL; + +/* If we've sent a proc_wait_request to the proc server, the pid of the + process we asked about. We can only ever have one outstanding. */ +int proc_wait_pid = 0; + +/* The number of wait requests we've sent, and expect replies from. */ +int proc_waits_pending = 0; + +int gnu_debug_flag = 0; + +/* Forward decls */ + +extern struct target_ops gnu_ops; + +struct inf *make_inf (); +void inf_clear_wait (struct inf *inf); +void inf_cleanup (struct inf *inf); +void inf_startup (struct inf *inf, int pid, task_t task); +int inf_update_suspends (struct inf *inf); +void inf_set_task (struct inf *inf, task_t port); +void inf_validate_procs (struct inf *inf); +void inf_steal_exc_ports (struct inf *inf); +void inf_restore_exc_ports (struct inf *inf); +int inf_update_procs (struct inf *inf); +struct proc *inf_tid_to_proc (struct inf *inf, int tid); +inline void inf_set_threads_resume_sc (struct inf *inf, struct proc + *run_thread, int run_others); +inline int inf_set_threads_resume_sc_for_signal_thread (struct inf *inf); +inline void inf_suspend (struct inf *inf); +inline void inf_resume (struct inf *inf); +void inf_set_step_thread (struct inf *inf, struct proc *proc); +void inf_detach (struct inf *inf); +void inf_attach (struct inf *inf, int pid); +void inf_signal (struct inf *inf, enum target_signal sig); + +#define inf_debug(_inf, msg, args...) \ + do { struct inf *__inf = (_inf); \ + debug ("{inf %d %p}: " msg, __inf->pid, __inf , ##args); } while (0) + +struct proc *make_proc (struct inf *inf, mach_port_t port, int tid); +struct proc *_proc_free (struct proc *proc); +int proc_update_sc (struct proc *proc); +void proc_abort (struct proc *proc, int force); +thread_state_t proc_get_state (struct proc *proc, int force); +error_t proc_get_exception_port (struct proc *proc, mach_port_t *port); +error_t proc_set_exception_port (struct proc *proc, mach_port_t port); +static mach_port_t _proc_get_exc_port (struct proc *proc); +void proc_steal_exc_port (struct proc *proc, mach_port_t exc_port); +void proc_restore_exc_port (struct proc *proc); +int proc_trace (struct proc *proc, int set); +char *proc_string (struct proc *proc); + +/* Evaluate RPC_EXPR in a scope with the variables MSGPORT and REFPORT bound + to INF's msg port and task port respectively. If it has no msg port, + EIEIO is returned. INF must refer to a running process! */ +#define INF_MSGPORT_RPC(inf, rpc_expr) \ + HURD_MSGPORT_RPC (proc_getmsgport (proc_server, inf->pid, &msgport), \ + (refport = inf->task->port, 0), 0, \ + msgport ? (rpc_expr) : EIEIO) + +/* Like INF_MSGPORT_RPC, but will also resume the signal thread to ensure + there's someone around to deal with the RPC (and resuspend things + afterwards). This effects INF's threads' resume_sc count. */ +#define INF_RESUME_MSGPORT_RPC(inf, rpc_expr) \ + (inf_set_threads_resume_sc_for_signal_thread (inf) \ + ? ({ error_t __e; \ + inf_resume (inf); \ + __e = INF_MSGPORT_RPC (inf, rpc_expr); \ + inf_suspend (inf); \ + __e; }) \ + : EIEIO) + +#define MIG_SERVER_DIED EMIG_SERVER_DIED /* XXX */ + +/* The state passed by an exception message. */ +struct exc_state +{ + int exception; /* The exception code */ + int code, subcode; + mach_port_t handler; /* The real exception port to handle this. */ + mach_port_t reply; /* The reply port from the exception call. */ +}; + +/* The results of the last wait an inf did. */ +struct inf_wait +{ + struct target_waitstatus status; /* The status returned to gdb. */ + struct exc_state exc; /* The exception that caused us to return. */ + struct proc *thread; /* The thread in question. */ + int suppress; /* Something trivial happened. */ +}; + +/* The state of an inferior. */ +struct inf +{ + /* Fields describing the current inferior. */ + + struct proc *task; /* The mach task. */ + struct proc *threads; /* A linked list of all threads in TASK. */ + + /* True if THREADS needn't be validated by querying the task. We assume that + we and the task in question are the only ones frobbing the thread list, + so as long as we don't let any code run, we don't have to worry about + THREADS changing. */ + int threads_up_to_date; + + pid_t pid; /* The real system PID. */ + + struct inf_wait wait; /* What to return from target_wait. */ + + /* One thread proc in INF may be in `single-stepping mode'. This is it. */ + struct proc *step_thread; + + /* The thread we think is the signal thread. */ + struct proc *signal_thread; + + mach_port_t event_port; /* Where we receive various msgs. */ + + /* True if we think at least one thread in the inferior could currently be + running. */ + int running : 1; + + /* True if the process has stopped (in the proc server sense). Note that + since a proc server `stop' leaves the signal thread running, the inf can + be RUNNING && STOPPED... */ + int stopped : 1; + + /* True if the inferior is traced. */ + int traced : 1; + + /* True if we shouldn't try waiting for the inferior, usually because we + can't for some reason. */ + int no_wait : 1; + + /* When starting a new inferior, we don't try to validate threads until all + the proper execs have been done. This is a count of how many execs we + expect to happen. */ + unsigned pending_execs; + + /* Fields describing global state */ + + /* The task suspend count used when gdb has control. This is normally 1 to + make things easier for us, but sometimes (like when attaching to vital + system servers) it may be desirable to let the task continue to run + (pausing individual threads as necessary). */ + int pause_sc; + + /* The initial values used for the run_sc and pause_sc of newly discovered + threads -- see the definition of those fields in struct proc. */ + int default_thread_run_sc; + int default_thread_pause_sc; + + /* True if the process should be traced when started/attached. Newly + started processes *must* be traced at first to exec them properly, but + if this is false, tracing is turned off as soon it has done so. */ + int want_signals; + + /* True if exceptions from the inferior process should be trapped. This + must be on to use breakpoints. */ + int want_exceptions; +}; + +int __proc_pid (struct proc *proc) +{ + return proc->inf->pid; +} + +/* Update PROC's real suspend count to match it's desired one. Returns true + if we think PROC is now in a runnable state. */ +int +proc_update_sc (struct proc *proc) +{ + int running; + int err = 0; + int delta = proc->sc - proc->cur_sc; + + if (delta) + proc_debug (proc, "sc: %d --> %d", proc->cur_sc, proc->sc); + + if (proc->sc == 0 && proc->state_changed) + /* Since PROC may start running, we must write back any state changes. */ + { + assert (proc_is_thread (proc)); + proc_debug (proc, "storing back changed thread state"); + err = thread_set_state (proc->port, THREAD_STATE_FLAVOR, + &proc->state, THREAD_STATE_SIZE); + if (! err) + proc->state_changed = 0; + } + + if (delta > 0) + while (delta-- > 0 && !err) + if (proc_is_task (proc)) + err = task_suspend (proc->port); + else + err = thread_suspend (proc->port); + else + while (delta++ < 0 && !err) + if (proc_is_task (proc)) + err = task_resume (proc->port); + else + err = thread_resume (proc->port); + + if (! err) + proc->cur_sc = proc->sc; + + /* If we got an error, then the task/thread has disappeared. */ + running = !err && proc->sc == 0; + + proc_debug (proc, "is %s", err ? "dead" : running ? "running" : "suspended"); + if (err) + proc_debug (proc, "err = %s", strerror (err)); + + if (running) + { + proc->aborted = 0; + proc->state_valid = proc->state_changed = 0; + proc->fetched_regs = 0; + } + + return running; +} + +/* Thread_abort is called on PROC if needed. PROC must be a thread proc. + If PROC is deemed `precious', then nothing is done unless FORCE is true. + In particular, a thread is precious if it's running (in which case forcing + it includes suspending it first), or if it has an exception pending. */ +void +proc_abort (struct proc *proc, int force) +{ + assert (proc_is_thread (proc)); + + if (! proc->aborted) + { + struct inf *inf = proc->inf; + int running = (proc->cur_sc == 0 && inf->task->cur_sc == 0); + + if (running && force) + { + proc->sc = 1; + inf_update_suspends (proc->inf); + running = 0; + warning ("Stopped %s.", proc_string (proc)); + } + else if (proc == inf->wait.thread && inf->wait.exc.reply && !force) + /* An exception is pending on PROC, which don't mess with. */ + running = 1; + + if (! running) + /* We only abort the thread if it's not actually running. */ + { + thread_abort (proc->port); + proc_debug (proc, "aborted"); + proc->aborted = 1; + } + else + proc_debug (proc, "not aborting"); + } +} + +/* Make sure that the state field in PROC is up to date, and return a pointer + to it, or 0 if something is wrong. If WILL_MODIFY is true, makes sure + that the thread is stopped and aborted first, and sets the state_changed + field in PROC to true. */ +thread_state_t +proc_get_state (struct proc *proc, int will_modify) +{ + int was_aborted = proc->aborted; + + proc_debug (proc, "updating state info%s", + will_modify ? " (with intention to modify)" : ""); + + proc_abort (proc, will_modify); + + if (! was_aborted && proc->aborted) + /* PROC's state may have changed since we last fetched it. */ + proc->state_valid = 0; + + if (! proc->state_valid) + { + mach_msg_type_number_t state_size = THREAD_STATE_SIZE; + error_t err = + thread_get_state (proc->port, THREAD_STATE_FLAVOR, + &proc->state, &state_size); + proc_debug (proc, "getting thread state"); + proc->state_valid = !err; + } + + if (proc->state_valid) + { + if (will_modify) + proc->state_changed = 1; + return &proc->state; + } + else + return 0; +} + +error_t +proc_get_exception_port (struct proc *proc, mach_port_t *port) +{ + if (proc_is_task (proc)) + return task_get_exception_port (proc->port, port); + else + return thread_get_exception_port (proc->port, port); +} + +error_t +proc_set_exception_port (struct proc *proc, mach_port_t port) +{ + proc_debug (proc, "setting exception port: %d", port); + if (proc_is_task (proc)) + return task_set_exception_port (proc->port, port); + else + return thread_set_exception_port (proc->port, port); +} + +/* Get PROC's exception port, cleaning up a bit if proc has died. */ +static mach_port_t +_proc_get_exc_port (struct proc *proc) +{ + mach_port_t exc_port; + error_t err = proc_get_exception_port (proc, &exc_port); + + if (err) + /* PROC must be dead. */ + { + if (proc->exc_port) + mach_port_deallocate (mach_task_self (), proc->exc_port); + proc->exc_port = MACH_PORT_NULL; + if (proc->saved_exc_port) + mach_port_deallocate (mach_task_self (), proc->saved_exc_port); + proc->saved_exc_port = MACH_PORT_NULL; + } + + return exc_port; +} + +/* Replace PROC's exception port with EXC_PORT, unless it's already been + done. Stash away any existing exception port so we can restore it later. */ +void +proc_steal_exc_port (struct proc *proc, mach_port_t exc_port) +{ + mach_port_t cur_exc_port = _proc_get_exc_port (proc); + + if (cur_exc_port) + { + error_t err; + + proc_debug (proc, "inserting exception port: %d", exc_port); + + if (cur_exc_port != exc_port) + /* Put in our exception port. */ + err = proc_set_exception_port (proc, exc_port); + + if (err || cur_exc_port == proc->exc_port) + /* We previously set the exception port, and it's still set. So we + just keep the old saved port which is what the proc set. */ + { + if (cur_exc_port) + mach_port_deallocate (mach_task_self (), cur_exc_port); + } + else + /* Keep a copy of PROC's old exception port so it can be restored. */ + { + if (proc->saved_exc_port) + mach_port_deallocate (mach_task_self (), proc->saved_exc_port); + proc->saved_exc_port = cur_exc_port; + } + + proc_debug (proc, "saved exception port: %d", proc->saved_exc_port); + + if (!err) + proc->exc_port = exc_port; + else + warning ("Error setting exception port for %s: %s", + proc_string (proc), strerror (err)); + } +} + +/* If we previously replaced PROC's exception port, put back what we found + there at the time, unless *our* exception port has since be overwritten, + in which case who knows what's going on. */ +void +proc_restore_exc_port (struct proc *proc) +{ + mach_port_t cur_exc_port = _proc_get_exc_port (proc); + + if (cur_exc_port) + { + error_t err = 0; + + proc_debug (proc, "restoring real exception port"); + + if (proc->exc_port == cur_exc_port) + /* Our's is still there. */ + err = proc_set_exception_port (proc, proc->saved_exc_port); + + if (proc->saved_exc_port) + mach_port_deallocate (mach_task_self (), proc->saved_exc_port); + proc->saved_exc_port = MACH_PORT_NULL; + + if (!err) + proc->exc_port = MACH_PORT_NULL; + else + warning ("Error setting exception port for %s: %s", + proc_string (proc), strerror (err)); + } +} + +/* Turns hardware tracing in PROC on or off when SET is true or fals, + respectively. Returns true on success. */ +int +proc_trace (struct proc *proc, int set) +{ + thread_state_t state = proc_get_state (proc, 1); + + if (! state) + return 0; /* the thread must be dead. */ + + proc_debug (proc, "tracing %s", set ? "on" : "off"); + + if (set) + { + /* XXX We don't get the exception unless the thread has its own + exception port???? */ + if (proc->exc_port == MACH_PORT_NULL) + proc_steal_exc_port (proc, proc->inf->event_port); + THREAD_STATE_SET_TRACED (state); + } + else + THREAD_STATE_CLEAR_TRACED (state); + + return 1; +} + +/* A variable from which to assign new TIDs. */ +static int next_thread_id = 1; + +/* Returns a new proc structure with the given fields. Also adds a + notification for PORT becoming dead to be sent to INF's notify port. */ +struct proc * +make_proc (struct inf *inf, mach_port_t port, int tid) +{ + error_t err; + mach_port_t prev_port = MACH_PORT_NULL; + struct proc *proc = malloc (sizeof (struct proc)); + + proc->port = port; + proc->tid = tid; + proc->inf = inf; + proc->next = 0; + proc->saved_exc_port = MACH_PORT_NULL; + proc->exc_port = MACH_PORT_NULL; + proc->sc = 0; + proc->cur_sc = 0; + proc->run_sc = inf->default_thread_run_sc; + proc->pause_sc = inf->default_thread_pause_sc; + proc->resume_sc = proc->run_sc; + proc->aborted = 0; + proc->state_valid = 0; + proc->state_changed = 0; + + proc_debug (proc, "is new"); + + /* Get notified when things die. */ + err = + mach_port_request_notification (mach_task_self(), port, + MACH_NOTIFY_DEAD_NAME, 1, + inf->event_port, + MACH_MSG_TYPE_MAKE_SEND_ONCE, + &prev_port); + if (err) + warning ("Couldn't request notification for port %d: %s", + port, strerror (err)); + else + { + proc_debug (proc, "notifications to: %d", inf->event_port); + if (prev_port != MACH_PORT_NULL) + mach_port_deallocate (mach_task_self (), prev_port); + } + + if (inf->want_exceptions) + if (proc_is_task (proc)) + /* Make the task exception port point to us. */ + proc_steal_exc_port (proc, inf->event_port); + else + /* Just clear thread exception ports -- they default to the task one. */ + proc_steal_exc_port (proc, MACH_PORT_NULL); + + return proc; +} + +/* Frees PROC and any resources it uses, and returns the value of PROC's next + field. */ +struct proc * +_proc_free (struct proc *proc) +{ + struct inf *inf = proc->inf; + struct proc *next = proc->next; + + proc_debug (proc, "freeing..."); + + if (proc == inf->step_thread) + /* Turn off single stepping. */ + inf_set_step_thread (inf, 0); + if (proc == inf->wait.thread) + inf_clear_wait (inf); + if (proc == inf->signal_thread) + inf->signal_thread = 0; + + if (proc->port != MACH_PORT_NULL) + { + if (proc->exc_port != MACH_PORT_NULL) + /* Restore the original exception port. */ + proc_restore_exc_port (proc); + if (proc->cur_sc != 0) + /* Resume the thread/task. */ + { + proc->sc = 0; + proc_update_sc (proc); + } + mach_port_deallocate (mach_task_self (), proc->port); + } + + free (proc); + return next; +} + +struct inf *make_inf () +{ + struct inf *inf = malloc (sizeof (struct inf)); + + if (!inf) + return 0; + + inf->task = 0; + inf->threads = 0; + inf->threads_up_to_date = 0; + inf->pid = 0; + inf->wait.status.kind = TARGET_WAITKIND_SPURIOUS; + inf->wait.thread = 0; + inf->wait.exc.handler = MACH_PORT_NULL; + inf->wait.exc.reply = MACH_PORT_NULL; + inf->step_thread = 0; + inf->signal_thread = 0; + inf->event_port = MACH_PORT_NULL; + inf->stopped = 0; + inf->running = 0; + inf->traced = 0; + inf->no_wait = 0; + inf->pending_execs = 0; + inf->pause_sc = 1; + inf->default_thread_run_sc = 0; + inf->default_thread_pause_sc = 0; + inf->want_signals = 1; /* By default */ + inf->want_exceptions = 1; /* By default */ + + return inf; +} + +void +inf_clear_wait (struct inf *inf) +{ + inf_debug (inf, "clearing wait"); + inf->wait.status.kind = TARGET_WAITKIND_SPURIOUS; + inf->wait.thread = 0; + inf->wait.suppress = 0; + if (inf->wait.exc.handler != MACH_PORT_NULL) + { + mach_port_deallocate (mach_task_self (), inf->wait.exc.handler); + inf->wait.exc.handler = MACH_PORT_NULL; + } + if (inf->wait.exc.reply != MACH_PORT_NULL) + { + mach_port_deallocate (mach_task_self (), inf->wait.exc.reply); + inf->wait.exc.reply = MACH_PORT_NULL; + } +} + +void +inf_cleanup (struct inf *inf) +{ + inf_debug (inf, "cleanup"); + + inf_clear_wait (inf); + + inf_set_task (inf, MACH_PORT_NULL); + inf->pid = 0; + inf->traced = 0; + inf->no_wait = 0; + inf->stopped = 0; + inf->running = 0; + inf->pending_execs = 0; + + if (inf->event_port) + { + mach_port_destroy (mach_task_self (), inf->event_port); + inf->event_port = MACH_PORT_NULL; + } +} + +void +inf_startup (struct inf *inf, int pid, task_t task) +{ + error_t err; + + inf_debug (inf, "startup: pid = %d, task = %d", pid, task); + + inf_cleanup (inf); + + /* Make the port on which we receive all events. */ + err = mach_port_allocate (mach_task_self (), + MACH_PORT_RIGHT_RECEIVE, &inf->event_port); + if (err) + error ("Error allocating event port: %s", strerror (err)); + + /* Make a send right for it, so we can easily copy it for other people. */ + mach_port_insert_right (mach_task_self (), inf->event_port, + inf->event_port, MACH_MSG_TYPE_MAKE_SEND); + + if (inf->pause_sc) + task_suspend (task); + + inf_set_task (inf, task); + + if (inf->task) + { + inf->pid = pid; + if (inf->pause_sc) + inf->task->sc = inf->task->cur_sc = 1; /* Reflect task_suspend above */ + } +} + +void +inf_set_task (struct inf *inf, mach_port_t port) +{ + struct proc *task = inf->task; + + inf_debug (inf, "setting task: %d", port); + + if (task && task->port != port) + { + inf->task = 0; + inf_validate_procs (inf); /* Trash all the threads. */ + _proc_free (task); /* And the task. */ + } + + if (port != MACH_PORT_NULL) + { + inf->task = make_proc (inf, port, PROC_TID_TASK); + inf->threads_up_to_date = 0; + } +} + +/* Validates INF's stopped field from the actual proc server state. */ +static void +inf_validate_stopped (struct inf *inf) +{ + char *noise; + mach_msg_type_number_t noise_len = 0; + struct procinfo *pi; + mach_msg_type_number_t pi_len = 0; + error_t err = + proc_getprocinfo (proc_server, inf->pid, 0, + (procinfo_t *)&pi, &pi_len, &noise, &noise_len); + + if (! err) + { + inf->stopped = !!(pi->state & PI_STOPPED); + vm_deallocate (mach_task_self (), (vm_address_t)pi, pi_len); + if (noise_len > 0) + vm_deallocate (mach_task_self (), (vm_address_t)noise, noise_len); + } +} + +/* Validates INF's task suspend count. */ +static void +inf_validate_task_sc (struct inf *inf) +{ + struct task_basic_info info; + mach_msg_type_number_t info_len = TASK_BASIC_INFO_COUNT; + error_t err = task_info (inf->task->port, TASK_BASIC_INFO, &info, &info_len); + if (! err) + { + if (inf->task->cur_sc < info.suspend_count) + warning ("Pid %d is suspended; continuing will clear existing suspend count.", inf->pid); + inf->task->cur_sc = info.suspend_count; + } +} + +/* Turns tracing for INF on or off, depending on ON, unless it already is. + If INF is running, the resume_sc count of INF's threads will be modified, + and the signal thread will briefly be run to change the trace state. */ +void +inf_set_traced (struct inf *inf, int on) +{ + if (on != inf->traced) + if (inf->task) + /* Make it take effect immediately. */ + { + error_t (*f)(mach_port_t, mach_port_t, int) = + on ? msg_set_some_exec_flags : msg_clear_some_exec_flags; + error_t err = + INF_RESUME_MSGPORT_RPC (inf, (*f)(msgport, refport, EXEC_TRACED)); + if (err == EIEIO) + warning ("Can't modify tracing state for pid %d: No signal thread", + inf->pid); + else if (err) + warning ("Can't modify tracing state for pid %d: %s", + inf->pid, strerror (err)); + else + inf->traced = on; + } + else + inf->traced = on; +} + +/* Makes all the real suspend count deltas of all the procs in INF match the + desired values. Careful to always do thread/task suspend counts in the + safe order. Returns true if at least one thread is thought to be running.*/ +int +inf_update_suspends (struct inf *inf) +{ + struct proc *task = inf->task; + /* We don't have to update INF->threads even though we're iterating over it + because we'll change a thread only if it already has an existing proc + entry. */ + + inf_debug (inf, "updating suspend counts"); + + if (task) + { + struct proc *thread; + int task_running = (task->sc == 0), thread_running = 0; + + if (task->sc > task->cur_sc) + /* The task is becoming _more_ suspended; do before any threads. */ + task_running = proc_update_sc (task); + + if (inf->pending_execs) + /* When we're waiting for an exec, things may be happening behind our + back, so be conservative. */ + thread_running = 1; + + /* Do all the thread suspend counts. */ + for (thread = inf->threads; thread; thread = thread->next) + thread_running |= proc_update_sc (thread); + + if (task->sc != task->cur_sc) + /* We didn't do the task first, because we wanted to wait for the + threads; do it now. */ + task_running = proc_update_sc (task); + + inf_debug (inf, "%srunning...", + (thread_running && task_running) ? "" : "not "); + + inf->running = thread_running && task_running; + + /* Once any thread has executed some code, we can't depend on the + threads list any more. */ + if (inf->running) + inf->threads_up_to_date = 0; + + return inf->running; + } + + return 0; +} + +/* Converts a GDB pid to a struct proc. */ +struct proc * +inf_tid_to_thread (struct inf *inf, int tid) +{ + struct proc *thread = inf->threads; + while (thread) + if (thread->tid == tid) + return thread; + else + thread = thread->next; + return 0; +} + +/* Converts a thread port to a struct proc. */ +struct proc * +inf_port_to_thread (struct inf *inf, mach_port_t port) +{ + struct proc *thread = inf->threads; + while (thread) + if (thread->port == port) + return thread; + else + thread = thread->next; + return 0; +} + +/* Make INF's list of threads be consistent with reality of TASK. */ +void +inf_validate_procs (struct inf *inf) +{ + int i; + thread_array_t threads; + unsigned num_threads; + struct proc *task = inf->task; + + inf->threads_up_to_date = !inf->running; + + if (task) + { + error_t err = task_threads (task->port, &threads, &num_threads); + inf_debug (inf, "fetching threads"); + if (err) + /* TASK must be dead. */ + { + task->port = MACH_PORT_NULL; + _proc_free (task); + task = inf->task = 0; + } + } + + if (!task) + { + num_threads = 0; + inf_debug (inf, "no task"); + } + + { + unsigned search_start = 0; /* Make things normally linear. */ + /* Which thread in PROCS corresponds to each task thread, & the task. */ + struct proc *matched[num_threads + 1]; + /* The last thread in INF->threads, so we can add to the end. */ + struct proc *last = 0; + /* The current thread we're considering. */ + struct proc *thread = inf->threads; + + bzero (matched, sizeof (matched)); + + while (thread) + { + unsigned left; + + for (i = search_start, left = num_threads; left; i++, left--) + { + if (i >= num_threads) + i -= num_threads; /* I wrapped around. */ + if (thread->port == threads[i]) + /* We already know about this thread. */ + { + matched[i] = thread; + last = thread; + thread = thread->next; + search_start++; + break; + } + } + + if (! left) + { + proc_debug (thread, "died!"); + thread->port = MACH_PORT_NULL; + thread = _proc_free (thread); /* THREAD is dead. */ + (last ? last->next : inf->threads) = thread; + } + } + + for (i = 0; i < num_threads; i++) + if (matched[i]) + /* Throw away the duplicate send right. */ + mach_port_deallocate (mach_task_self (), threads[i]); + else + /* THREADS[I] is a thread we don't know about yet! */ + { + thread = make_proc (inf, threads[i], next_thread_id++); + (last ? last->next : inf->threads) = thread; + last = thread; + proc_debug (thread, "new thread: %d", threads[i]); + add_thread (thread->tid); /* Tell GDB's generic thread code. */ + } + + vm_deallocate(mach_task_self(), + (vm_address_t)threads, (num_threads * sizeof(thread_t))); + } +} + +/* Makes sure that INF's thread list is synced with the actual process. */ +inline int +inf_update_procs (struct inf *inf) +{ + if (! inf->task) + return 0; + if (! inf->threads_up_to_date) + inf_validate_procs (inf); + return !!inf->task; +} + +/* Sets the resume_sc of each thread in inf. That of RUN_THREAD is set to 0, + and others are set to their run_sc if RUN_OTHERS is true, and otherwise + their pause_sc. */ +inline void +inf_set_threads_resume_sc (struct inf *inf, + struct proc *run_thread, int run_others) +{ + struct proc *thread; + inf_update_procs (inf); + for (thread = inf->threads; thread; thread = thread->next) + if (thread == run_thread) + thread->resume_sc = 0; + else if (run_others) + thread->resume_sc = thread->run_sc; + else + thread->resume_sc = thread->pause_sc; +} + +/* Cause INF to continue execution immediately; individual threads may still + be suspended (but their suspend counts will be updated). */ +inline void +inf_resume (struct inf *inf) +{ + struct proc *thread; + + inf_update_procs (inf); + + for (thread = inf->threads; thread; thread = thread->next) + thread->sc = thread->resume_sc; + + if (inf->task) + inf->task->sc = 0; + + inf_update_suspends (inf); +} + +/* Cause INF to stop execution immediately; individual threads may still + be running. */ +inline void +inf_suspend (struct inf *inf) +{ + struct proc *thread; + + inf_update_procs (inf); + + for (thread = inf->threads; thread; thread = thread->next) + thread->sc = thread->pause_sc; + + if (inf->task) + inf->task->sc = inf->pause_sc; + + inf_update_suspends (inf); +} + +/* INF has one thread PROC that is in single-stepping mode. This functions + changes it to be PROC, changing any old step_thread to be a normal one. A + PROC of 0 clears an any existing value. */ +void +inf_set_step_thread (struct inf *inf, struct proc *thread) +{ + assert (!thread || proc_is_thread (thread)); + + if (thread) + inf_debug (inf, "setting step thread: %d/%d", inf->pid, thread->tid); + else + inf_debug (inf, "clearing step thread"); + + if (inf->step_thread != thread) + { + if (inf->step_thread && inf->step_thread->port != MACH_PORT_NULL) + if (! proc_trace (inf->step_thread, 0)) + return; + if (thread && proc_trace (thread, 1)) + inf->step_thread = thread; + else + inf->step_thread = 0; + } +} + +/* Set up the thread resume_sc's so that only the signal thread is running + (plus whatever other thread are set to always run). Returns true if we + did so, or false if we can't find a signal thread. */ +inline int +inf_set_threads_resume_sc_for_signal_thread (struct inf *inf) +{ + if (inf->signal_thread) + { + inf_set_threads_resume_sc (inf, inf->signal_thread, 0); + return 1; + } + else + return 0; +} + +static void +inf_update_signal_thread (struct inf *inf) +{ + /* XXX for now we assume that if there's a msgport, the 2nd thread is + the signal thread. */ + inf->signal_thread = inf->threads ? inf->threads->next : 0; +} + +/* Detachs from INF's inferior task, letting it run once again... */ +void +inf_detach (struct inf *inf) +{ + struct proc *task = inf->task; + + inf_debug (inf, "detaching..."); + + inf_clear_wait (inf); + inf_set_step_thread (inf, 0); + + if (task) + { + struct proc *thread; + + inf_set_traced (inf, 0); + if (inf->stopped) + inf_signal (inf, TARGET_SIGNAL_0); + + proc_restore_exc_port (task); + task->sc = 0; + + for (thread = inf->threads; thread; thread = thread->next) + { + proc_restore_exc_port (thread); + thread->sc = 0; + } + + inf_update_suspends (inf); + } + + inf_cleanup (inf); +} + +/* Attaches INF to the process with process id PID, returning it in a suspended + state suitable for debugging. */ +void +inf_attach (struct inf *inf, int pid) +{ + error_t err; + task_t task; + + inf_debug (inf, "attaching: %d", pid); + + err = proc_pid2task (proc_server, pid, &task); + if (err) + error ("Error getting task for pid %d: %s", pid, strerror (err)); + + if (inf->pid) + inf_detach (inf); + + inf_startup (inf, pid, task); +} + +/* Makes sure that we've got our exception ports entrenched in the process. */ +void inf_steal_exc_ports (struct inf *inf) +{ + struct proc *thread; + + inf_debug (inf, "stealing exception ports"); + + inf_set_step_thread (inf, 0); /* The step thread is special. */ + + proc_steal_exc_port (inf->task, inf->event_port); + for (thread = inf->threads; thread; thread = thread->next) + proc_steal_exc_port (thread, MACH_PORT_NULL); +} + +/* Makes sure the process has its own exception ports. */ +void inf_restore_exc_ports (struct inf *inf) +{ + struct proc *thread; + + inf_debug (inf, "restoring exception ports"); + + inf_set_step_thread (inf, 0); /* The step thread is special. */ + + proc_restore_exc_port (inf->task); + for (thread = inf->threads; thread; thread = thread->next) + proc_restore_exc_port (thread); +} + +/* Deliver signal SIG to INF. If INF is stopped, delivering a signal, even + signal 0, will continue it. INF is assumed to be in a paused state, and + the resume_sc's of INF's threads may be affected. */ +void +inf_signal (struct inf *inf, enum target_signal sig) +{ + error_t err = 0; + int host_sig = target_signal_to_host (sig); + +#define NAME target_signal_to_name (sig) + + if (host_sig >= _NSIG) + /* A mach exception. Exceptions are encoded in the signal space by + putting them after _NSIG; this assumes they're positive (and not + extremely large)! */ + { + struct inf_wait *w = &inf->wait; + if (w->status.kind == TARGET_WAITKIND_STOPPED + && w->status.value.sig == sig + && w->thread && !w->thread->aborted) + /* We're passing through the last exception we received. This is + kind of bogus, because exceptions are per-thread whereas gdb + treats signals as per-process. We just forward the exception to + the correct handler, even it's not for the same thread as TID -- + i.e., we pretend it's global. */ + { + struct exc_state *e = &w->exc; + inf_debug (inf, "passing through exception:" + " task = %d, thread = %d, exc = %d" + ", code = %d, subcode = %d", + w->thread->port, inf->task->port, + e->exception, e->code, e->subcode); + err = + exception_raise_request (e->handler, + e->reply, MACH_MSG_TYPE_MOVE_SEND_ONCE, + w->thread->port, inf->task->port, + e->exception, e->code, e->subcode); + } + else + warning ("Can't forward spontaneous exception (%s).", NAME); + } + else + /* A Unix signal. */ + if (inf->stopped) + /* The process is stopped an expecting a signal. Just send off a + request and let it get handled when we resume everything. */ + { + inf_debug (inf, "sending %s to stopped process", NAME); + err = + INF_MSGPORT_RPC (inf, + msg_sig_post_untraced_request (msgport, + inf->event_port, + MACH_MSG_TYPE_MAKE_SEND_ONCE, + host_sig, + refport)); + if (! err) + /* Posting an untraced signal automatically continues it. + We clear this here rather than when we get the reply + because we'd rather assume it's not stopped when it + actually is, than the reverse. */ + inf->stopped = 0; + } + else + /* It's not expecting it. We have to let just the signal thread + run, and wait for it to get into a reasonable state before we + can continue the rest of the process. When we finally resume the + process the signal we request will be the very first thing that + happens. */ + { + inf_debug (inf, "sending %s to unstopped process (so resuming signal thread)", NAME); + err = + INF_RESUME_MSGPORT_RPC (inf, + msg_sig_post_untraced (msgport, + host_sig, refport)); + } + + if (err == EIEIO) + /* Can't do too much... */ + warning ("Can't deliver signal %s: No signal thread.", NAME); + else if (err) + warning ("Delivering signal %s: %s", NAME, strerror (err)); + +#undef NAME +} + +/* The inferior used for all gdb target ops. */ +struct inf *current_inferior = 0; + +/* The inferior being waited for by gnu_wait. Since GDB is decidely not + multi-threaded, we don't bother to lock this. */ +struct inf *waiting_inf; + +/* Wait for something to happen in the inferior, returning what in STATUS. */ +static int +gnu_wait (int tid, struct target_waitstatus *status) +{ + struct msg { + mach_msg_header_t hdr; + mach_msg_type_t type; + int data[8000]; + } msg; + error_t err; + struct proc *thread; + struct inf *inf = current_inferior; + + waiting_inf = inf; + + inf_debug (inf, "waiting for: %d", tid); + + rewait: + if (proc_wait_pid != inf->pid && !inf->no_wait) + /* Always get information on events from the proc server. */ + { + inf_debug (inf, "requesting wait on pid %d", inf->pid); + + if (proc_wait_pid) + /* The proc server is single-threaded, and only allows a single + outstanding wait request, so we have to cancel the previous one. */ + { + inf_debug (inf, "cancelling previous wait on pid %d", proc_wait_pid); + interrupt_operation (proc_server); + } + + err = + proc_wait_request (proc_server, inf->event_port, inf->pid, WUNTRACED); + if (err) + warning ("wait request failed: %s", strerror (err)); + else + { + inf_debug (inf, "waits pending: %d", proc_waits_pending); + proc_wait_pid = inf->pid; + /* Even if proc_waits_pending was > 0 before, we still won't get + any other replies, because it was either from a different INF, + or a different process attached to INF -- and the event port, + which is the wait reply port, changes when you switch processes.*/ + proc_waits_pending = 1; + } + } + + inf_clear_wait (inf); + + /* What can happen? (1) Dead name notification; (2) Exceptions arrive; + (3) wait reply from the proc server. */ + + inf_debug (inf, "waiting for an event..."); + err = _hurd_intr_rpc_mach_msg (&msg.hdr, MACH_RCV_MSG, 0, + sizeof (struct msg), + inf->event_port, MACH_PORT_NULL); + + /* Re-suspend the task. */ + inf_suspend (inf); + + if (err == EINTR) + inf_debug (inf, "interrupted"); + else if (err) + error ("Couldn't wait for an event: %s", strerror (err)); + else + { + struct { + mach_msg_header_t hdr; + mach_msg_type_t err_type; + kern_return_t err; + char noise[200]; + } reply; + + inf_debug (inf, "event: msgid = %d", msg.hdr.msgh_id); + + /* Handle what we got. */ + if (! notify_server (&msg.hdr, &reply.hdr) + && ! exc_server (&msg.hdr, &reply.hdr) + && ! process_reply_server (&msg.hdr, &reply.hdr) + && ! msg_reply_server (&msg.hdr, &reply.hdr)) + /* Whatever it is, it's something strange. */ + error ("Got a strange event, msg id = %d.", msg.hdr.msgh_id); + + if (reply.err) + error ("Handling event, msgid = %d: %s", + msg.hdr.msgh_id, strerror (reply.err)); + } + + if (inf->pending_execs) + /* We're waiting for the inferior to finish execing. */ + { + struct inf_wait *w = &inf->wait; + enum target_waitkind kind = w->status.kind; + + if (kind == TARGET_WAITKIND_SPURIOUS) + /* Since gdb is actually counting the number of times the inferior + stops, expecting one stop per exec, we only return major events + while execing. */ + w->suppress = 1; + else if (kind == TARGET_WAITKIND_STOPPED + && w->status.value.sig == TARGET_SIGNAL_TRAP) + /* Ah hah! A SIGTRAP from the inferior while starting up probably + means we've succesfully completed an exec! */ + if (--inf->pending_execs == 0) + /* We're done! */ + { + prune_threads (1); /* Get rid of the old shell threads */ + renumber_threads (0); /* Give our threads reasonable names. */ + } + } + + if (inf->wait.suppress) + /* Some totally spurious event happened that we don't consider + worth returning to gdb. Just keep waiting. */ + { + inf_debug (inf, "suppressing return, rewaiting..."); + inf_resume (inf); + goto rewait; + } + + /* Pass back out our results. */ + bcopy (&inf->wait.status, status, sizeof (*status)); + + thread = inf->wait.thread; + if (thread) + tid = thread->tid; + else + thread = inf_tid_to_thread (inf, tid); + + if (!thread || thread->port == MACH_PORT_NULL) + /* TID is dead; try and find a new thread. */ + if (inf_update_procs (inf) && inf->threads) + tid = inf->threads->tid; /* The first available thread. */ + else + tid = -1; + + if (thread && tid >= 0 && status->kind != TARGET_WAITKIND_SPURIOUS + && inf->pause_sc == 0 && thread->pause_sc == 0) + /* If something actually happened to THREAD, make sure we suspend it. */ + { + thread->sc = 1; + inf_update_suspends (inf); + } + + inf_debug (inf, "returning tid = %d, status = %s (%d)", tid, + status->kind == TARGET_WAITKIND_EXITED ? "EXITED" + : status->kind == TARGET_WAITKIND_STOPPED ? "STOPPED" + : status->kind == TARGET_WAITKIND_SIGNALLED ? "SIGNALLED" + : status->kind == TARGET_WAITKIND_LOADED ? "LOADED" + : status->kind == TARGET_WAITKIND_SPURIOUS ? "SPURIOUS" + : "?", + status->value.integer); + + return tid; +} + +/* The rpc handler called by exc_server. */ +error_t +S_exception_raise_request (mach_port_t port, mach_port_t reply_port, + thread_t thread_port, task_t task_port, + int exception, int code, int subcode) +{ + struct inf *inf = waiting_inf; + struct proc *thread = inf_port_to_thread (inf, thread_port); + + inf_debug (waiting_inf, + "thread = %d, task = %d, exc = %d, code = %d, subcode = %d", + thread_port, task_port, exception, code); + + if (!thread) + /* We don't know about thread? */ + { + inf_update_procs (inf); + thread = inf_port_to_thread (inf, thread_port); + if (!thread) + /* Give up, the generating thread is gone. */ + return 0; + } + + mach_port_deallocate (mach_task_self (), thread_port); + mach_port_deallocate (mach_task_self (), task_port); + + if (! thread->aborted) + /* THREAD hasn't been aborted since this exception happened (abortion + clears any exception state), so it must be real. */ + { + /* Store away the details; this will destroy any previous info. */ + inf->wait.thread = thread; + + inf->wait.status.kind = TARGET_WAITKIND_STOPPED; + + if (exception == EXC_BREAKPOINT) + /* GDB likes to get SIGTRAP for breakpoints. */ + { + inf->wait.status.value.sig = TARGET_SIGNAL_TRAP; + mach_port_deallocate (mach_task_self (), reply_port); + } + else + /* Record the exception so that we can forward it later. */ + { + if (thread->exc_port == port) + inf->wait.exc.handler = thread->saved_exc_port; + else + { + inf->wait.exc.handler = inf->task->saved_exc_port; + assert (inf->task->exc_port == port); + } + if (inf->wait.exc.handler != MACH_PORT_NULL) + /* Add a reference to the exception handler. */ + mach_port_mod_refs (mach_task_self (), + inf->wait.exc.handler, MACH_PORT_RIGHT_SEND, + 1); + + inf->wait.exc.exception = exception; + inf->wait.exc.code = code; + inf->wait.exc.subcode = subcode; + inf->wait.exc.reply = reply_port; + + /* Exceptions are encoded in the signal space by putting them after + _NSIG; this assumes they're positive (and not extremely large)! */ + inf->wait.status.value.sig = + target_signal_from_host (_NSIG + exception); + } + } + else + /* A supppressed exception, which ignore. */ + { + inf->wait.suppress = 1; + mach_port_deallocate (mach_task_self (), reply_port); + } + + return 0; +} + +/* Fill in INF's wait field after a task has died without giving us more + detailed information. */ +void +inf_task_died_status (struct inf *inf) +{ + warning ("Pid %d died with unknown exit status, using SIGKILL.", inf->pid); + inf->wait.status.kind = TARGET_WAITKIND_SIGNALLED; + inf->wait.status.value.sig = TARGET_SIGNAL_KILL; +} + +/* Notify server routines. The only real one is dead name notification. */ + +error_t +do_mach_notify_dead_name (mach_port_t notify, mach_port_t dead_port) +{ + struct inf *inf = waiting_inf; + + inf_debug (waiting_inf, "port = %d", dead_port); + + if (inf->task && inf->task->port == dead_port) + { + proc_debug (inf->task, "is dead"); + inf->task->port = MACH_PORT_NULL; + if (proc_wait_pid == inf->pid) + /* We have a wait outstanding on the process, which will return more + detailed information, so delay until we get that. */ + inf->wait.suppress = 1; + else + /* We never waited for the process (maybe it wasn't a child), so just + pretend it got a SIGKILL. */ + inf_task_died_status (inf); + } + else + { + struct proc *thread = inf_port_to_thread (inf, dead_port); + if (thread) + { + proc_debug (thread, "is dead"); + thread->port = MACH_PORT_NULL; + } + } + + mach_port_deallocate (mach_task_self (), dead_port); + inf->threads_up_to_date = 0; /* Just in case */ + + return 0; +} + +static error_t +ill_rpc (char *fun) +{ + warning ("illegal rpc: %s", fun); + return 0; +} + +error_t +do_mach_notify_no_senders (mach_port_t notify, mach_port_mscount_t count) +{ + return ill_rpc (__FUNCTION__); +} + +error_t +do_mach_notify_port_deleted (mach_port_t notify, mach_port_t name) +{ + return ill_rpc (__FUNCTION__); +} + +error_t +do_mach_notify_msg_accepted (mach_port_t notify, mach_port_t name) +{ + return ill_rpc (__FUNCTION__); +} + +error_t +do_mach_notify_port_destroyed (mach_port_t notify, mach_port_t name) +{ + return ill_rpc (__FUNCTION__); +} + +error_t +do_mach_notify_send_once (mach_port_t notify) +{ + return ill_rpc (__FUNCTION__); +} + +/* Process_reply server routines. We only use process_wait_reply. */ + +error_t +S_proc_wait_reply (mach_port_t reply, error_t err, + int status, rusage_t rusage, pid_t pid) +{ + struct inf *inf = waiting_inf; + + inf_debug (inf, "err = %s, pid = %d, status = 0x%x", + err ? strerror (err) : "0", pid, status); + + if (err && proc_wait_pid && (!inf->task || !inf->task->port)) + /* Ack. The task has died, but the task-died notification code didn't + tell anyone because it thought a more detailed reply from the + procserver was forthcoming. However, we now learn that won't + happen... So we have to act like the task just died, and this time, + tell the world. */ + inf_task_died_status (inf); + + if (--proc_waits_pending == 0) + /* PROC_WAIT_PID represents the most recent wait. We will always get + replies in order because the proc server is single threaded. */ + proc_wait_pid = 0; + + inf_debug (inf, "waits pending now: %d", proc_waits_pending); + + if (err) + { + if (err != EINTR) + { + warning ("Can't wait for pid %d: %s", inf->pid, strerror (err)); + inf->no_wait = 1; + + /* Since we can't see the inferior's signals, don't trap them. */ + inf_set_traced (inf, 0); + } + } + else if (pid == inf->pid) + { + store_waitstatus (&inf->wait.status, status); + if (inf->wait.status.kind == TARGET_WAITKIND_STOPPED) + /* The process has sent us a signal, and stopped itself in a sane + state pending our actions. */ + { + inf_debug (inf, "process has stopped itself"); + inf->stopped = 1; + + /* We recheck the task suspend count here because the crash server + messes with it in an unfriendly way, right before `stopping'. */ + inf_validate_task_sc (inf); + } + } + else + inf->wait.suppress = 1; /* Something odd happened. Ignore. */ + + return 0; +} + +error_t +S_proc_setmsgport_reply (mach_port_t reply, error_t err, + mach_port_t old_msg_port) +{ + return ill_rpc (__FUNCTION__); +} + +error_t +S_proc_getmsgport_reply (mach_port_t reply, error_t err, mach_port_t msg_port) +{ + return ill_rpc (__FUNCTION__); +} + +/* Msg_reply server routines. We only use msg_sig_post_untraced_reply. */ + +error_t +S_msg_sig_post_untraced_reply (mach_port_t reply, error_t err) +{ + struct inf *inf = waiting_inf; + + if (err == EBUSY) + /* EBUSY is what we get when the crash server has grabbed control of the + process and doesn't like what signal we tried to send it. Just act + like the process stopped (using a signal of 0 should mean that the + *next* time the user continues, it will pass signal 0, which the crash + server should like). */ + { + inf->wait.status.kind = TARGET_WAITKIND_STOPPED; + inf->wait.status.value.sig = TARGET_SIGNAL_0; + } + else if (err) + warning ("Signal delivery failed: %s", strerror (err)); + + if (err) + /* We only get this reply when we've posted a signal to a process which we + thought was stopped, and which we expected to continue after the signal. + Given that the signal has failed for some reason, it's reasonable to + assume it's still stopped. */ + inf->stopped = 1; + else + inf->wait.suppress = 1; + + return 0; +} + +error_t +S_msg_sig_post_reply (mach_port_t reply, error_t err) +{ + return ill_rpc (__FUNCTION__); +} + +/* Returns the number of messages queued for the receive right PORT. */ +static mach_port_msgcount_t +port_msgs_queued (mach_port_t port) +{ + struct mach_port_status status; + error_t err = + mach_port_get_receive_status (mach_task_self (), port, &status); + + if (err) + return 0; + else + return status.mps_msgcount; +} + +/* Resume execution of the inferior process. + + If STEP is nonzero, single-step it. + If SIGNAL is nonzero, give it that signal. + + TID STEP: + -1 true Single step the current thread allowing other threads to run. + -1 false Continue the current thread allowing other threads to run. + X true Single step the given thread, don't allow any others to run. + X false Continue the given thread, do not allow any others to run. + (Where X, of course, is anything except -1) + + Note that a resume may not `take' if there are pending exceptions/&c + still unprocessed from the last resume we did (any given resume may result + in multiple events returned by wait). +*/ +static void +gnu_resume (int tid, int step, enum target_signal sig) +{ + struct proc *step_thread = 0; + struct inf *inf = current_inferior; + + inf_debug (inf, "tid = %d, step = %d, sig = %d", tid, step, sig); + + if (sig != TARGET_SIGNAL_0 || inf->stopped) + inf_signal (inf, sig); + else if (inf->wait.exc.reply != MACH_PORT_NULL) + /* We received an exception to which we have chosen not to forward, so + abort the faulting thread, which will perhaps retake it. */ + { + proc_abort (inf->wait.thread, 1); + warning ("Aborting %s with unforwarded exception %s.", + proc_string (inf->wait.thread), + target_signal_to_name (inf->wait.status.value.sig)); + } + + if (port_msgs_queued (inf->event_port)) + /* If there are still messages in our event queue, don't bother resuming + the process, as we're just going to stop it right away anyway. */ + return; + + if (tid < 0) + /* Allow all threads to run, except perhaps single-stepping one. */ + { + inf_debug (inf, "running all threads; tid = %d", inferior_pid); + tid = inferior_pid; /* What to step. */ + inf_set_threads_resume_sc (inf, 0, 1); + } + else + /* Just allow a single thread to run. */ + { + struct proc *thread = inf_tid_to_thread (inf, tid); + assert (thread); + + inf_debug (inf, "running one thread: %d/%d", inf->pid, thread->tid); + inf_set_threads_resume_sc (inf, thread, 0); + } + + if (step) + { + step_thread = inf_tid_to_thread (inf, tid); + assert (step_thread); + inf_debug (inf, "stepping thread: %d/%d", inf->pid, step_thread->tid); + } + if (step_thread != inf->step_thread) + inf_set_step_thread (inf, step_thread); + + inf_debug (inf, "here we go..."); + inf_resume (inf); +} + +static void +gnu_kill_inferior () +{ + struct proc *task = current_inferior->task; + if (task) + { + proc_debug (task, "terminating..."); + task_terminate (task->port); + task->port = MACH_PORT_NULL; + inf_validate_procs (current_inferior); /* Clear out the thread list &c */ + } + target_mourn_inferior (); +} + +/* Clean up after the inferior dies. */ + +static void +gnu_mourn_inferior () +{ + inf_debug (current_inferior, "rip"); + inf_detach (current_inferior); + unpush_target (&gnu_ops); + generic_mourn_inferior (); +} + +/* Fork an inferior process, and start debugging it. */ + +/* Set INFERIOR_PID to the first thread available in the child, if any. */ +static void +pick_first_thread () +{ + if (current_inferior->task && current_inferior->threads) + /* The first thread. */ + inferior_pid = current_inferior->threads->tid; + else + /* What may be the next thread. */ + inferior_pid = next_thread_id; +} + +static struct inf * +cur_inf () +{ + if (! current_inferior) + current_inferior = make_inf (); + return current_inferior; +} + +static void +gnu_create_inferior (exec_file, allargs, env) + char *exec_file; + char *allargs; + char **env; +{ + struct inf *inf = cur_inf (); + + void trace_me () + { + /* We're in the child; make this process stop as soon as it execs. */ + inf_debug (inf, "tracing self"); + ptrace (PTRACE_TRACEME, 0, 0, 0); + } + void attach_to_child (int pid) + { + /* Attach to the now stopped child, which is actually a shell... */ + inf_debug (inf, "attaching to child: %d", pid); + + inf_attach (inf, pid); + pick_first_thread (); + + attach_flag = 0; + push_target (&gnu_ops); + + inf->pending_execs = 2; + inf->traced = 1; + + /* Now let the child run again, knowing that it will stop immediately + because of the ptrace. */ + inf_resume (inf); + + startup_inferior (pid, inf->pending_execs); + } + + inf_debug (inf, "creating inferior"); + + fork_inferior (exec_file, allargs, env, trace_me, attach_to_child, NULL); + + inf_update_signal_thread (inf); + inf_set_traced (inf, inf->want_signals); + + /* Execing the process will have trashed our exception ports; steal them + back (or make sure they're restored if the user wants that). */ + if (inf->want_exceptions) + inf_steal_exc_ports (inf); + else + inf_restore_exc_ports (inf); + + /* Here we go! */ + proceed ((CORE_ADDR) -1, 0, 0); +} + +/* Mark our target-struct as eligible for stray "run" and "attach" + commands. */ +static int +gnu_can_run () +{ + return 1; +} + +#ifdef ATTACH_DETACH + +/* Attach to process PID, then initialize for debugging it + and wait for the trace-trap that results from attaching. */ +static void +gnu_attach (args, from_tty) + char *args; + int from_tty; +{ + int pid; + char *exec_file; + struct inf *inf = cur_inf (); + + if (!args) + error_no_arg ("PID to attach"); + + pid = atoi (args); + + if (pid == getpid()) /* Trying to masturbate? */ + error ("I refuse to debug myself!"); + + if (from_tty) + { + exec_file = (char *) get_exec_file (0); + + if (exec_file) + printf_unfiltered ("Attaching to program `%s', pid %d\n", + exec_file, pid); + else + printf_unfiltered ("Attaching to pid %d\n", pid); + + gdb_flush (gdb_stdout); + } + + inf_debug (inf, "attaching to pid: %d", pid); + + inf_attach (inf, pid); + inf_update_procs (inf); + + pick_first_thread (); + + attach_flag = 1; + push_target (&gnu_ops); + + inf_update_signal_thread (inf); + inf_set_traced (inf, inf->want_signals); + + /* If the process was stopped before we attached, make it continue the next + time the user does a continue. */ + inf_validate_stopped (inf); + inf_validate_task_sc (inf); +} + +/* 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. For this + to work, it may be necessary for the process to have been + previously attached. It *might* work if the program was + started via fork. */ +static void +gnu_detach (args, from_tty) + char *args; + int from_tty; +{ + if (from_tty) + { + char *exec_file = get_exec_file (0); + if (exec_file) + printf_unfiltered ("Detaching from program `%s' pid %d\n", + exec_file, current_inferior->pid); + else + printf_unfiltered ("Detaching from pid %d\n", current_inferior->pid); + gdb_flush (gdb_stdout); + } + + inf_detach (current_inferior); + + inferior_pid = 0; + + unpush_target (&gnu_ops); /* Pop out of handling an inferior */ +} +#endif /* ATTACH_DETACH */ + +static void +gnu_terminal_init_inferior () +{ + assert (current_inferior); + terminal_init_inferior_with_pgrp (current_inferior->pid); +} + +/* Get ready to modify the registers array. On machines which store + individual registers, this doesn't need to do anything. On machines + which store all the registers in one fell swoop, this makes sure + that registers contains all the registers from the program being + debugged. */ + +static void +gnu_prepare_to_store () +{ +#ifdef CHILD_PREPARE_TO_STORE + CHILD_PREPARE_TO_STORE (); +#endif +} + +static void +gnu_open (arg, from_tty) + char *arg; + int from_tty; +{ + error ("Use the \"run\" command to start a Unix child process."); +} + +static void +gnu_stop () +{ + error ("to_stop target function not implemented"); +} + +static int +gnu_thread_alive (int tid) +{ + inf_update_procs (current_inferior); + return !!inf_tid_to_thread (current_inferior, tid); +} + +/* + * Read inferior task's LEN bytes from ADDR and copy it to MYADDR + * in gdb's address space. + * + * Return 0 on failure; number of bytes read otherwise. + */ +int +gnu_read_inferior (task, addr, myaddr, length) + task_t task; + CORE_ADDR addr; + char *myaddr; + int length; +{ + error_t err; + vm_address_t low_address = (vm_address_t) trunc_page (addr); + vm_size_t aligned_length = + (vm_size_t) round_page (addr+length) - low_address; + pointer_t copied; + int copy_count; + + /* Get memory from inferior with page aligned addresses */ + err = vm_read (task, low_address, aligned_length, &copied, ©_count); + if (err) + return 0; + + err = hurd_safe_copyin (myaddr, (void*)addr - low_address + copied, length); + if (err) + { + warning ("Read from inferior faulted: %s", strerror (err)); + length = 0; + } + + err = vm_deallocate (mach_task_self (), copied, copy_count); + if (err) + warning ("gnu_read_inferior vm_deallocate failed: %s", strerror (err)); + + return length; +} + +#define CHK_GOTO_OUT(str,ret) \ + do if (ret != KERN_SUCCESS) { errstr = #str; goto out; } while(0) + +struct vm_region_list { + struct vm_region_list *next; + vm_prot_t protection; + vm_address_t start; + vm_size_t length; +}; + +struct obstack region_obstack; + +/* + * Write inferior task's LEN bytes from ADDR and copy it to MYADDR + * in gdb's address space. + */ +int +gnu_write_inferior (task, addr, myaddr, length) + task_t task; + CORE_ADDR addr; + char *myaddr; + int length; +{ + error_t err = 0; + vm_address_t low_address = (vm_address_t) trunc_page (addr); + vm_size_t aligned_length = + (vm_size_t) round_page (addr+length) - low_address; + pointer_t copied; + int copy_count; + int deallocate = 0; + + char *errstr = "Bug in gnu_write_inferior"; + + struct vm_region_list *region_element; + struct vm_region_list *region_head = (struct vm_region_list *)NULL; + + /* Get memory from inferior with page aligned addresses */ + err = vm_read (task, + low_address, + aligned_length, + &copied, + ©_count); + CHK_GOTO_OUT ("gnu_write_inferior vm_read failed", err); + + deallocate++; + + err = hurd_safe_copyout ((void*)addr - low_address + copied, myaddr, length); + CHK_GOTO_OUT ("Write to inferior faulted", err); + + obstack_init (®ion_obstack); + + /* Do writes atomically. + * First check for holes and unwritable memory. + */ + { + vm_size_t remaining_length = aligned_length; + vm_address_t region_address = low_address; + + struct vm_region_list *scan; + + while(region_address < low_address + aligned_length) + { + vm_prot_t protection; + vm_prot_t max_protection; + vm_inherit_t inheritance; + boolean_t shared; + mach_port_t object_name; + vm_offset_t offset; + vm_size_t region_length = remaining_length; + vm_address_t old_address = region_address; + + err = vm_region (task, + ®ion_address, + ®ion_length, + &protection, + &max_protection, + &inheritance, + &shared, + &object_name, + &offset); + CHK_GOTO_OUT ("vm_region failed", err); + + /* Check for holes in memory */ + if (old_address != region_address) + { + warning ("No memory at 0x%x. Nothing written", + old_address); + err = KERN_SUCCESS; + length = 0; + goto out; + } + + if (!(max_protection & VM_PROT_WRITE)) + { + warning ("Memory at address 0x%x is unwritable. Nothing written", + old_address); + err = KERN_SUCCESS; + length = 0; + goto out; + } + + /* Chain the regions for later use */ + region_element = + (struct vm_region_list *) + obstack_alloc (®ion_obstack, sizeof (struct vm_region_list)); + + region_element->protection = protection; + region_element->start = region_address; + region_element->length = region_length; + + /* Chain the regions along with protections */ + region_element->next = region_head; + region_head = region_element; + + region_address += region_length; + remaining_length = remaining_length - region_length; + } + + /* If things fail after this, we give up. + * Somebody is messing up inferior_task's mappings. + */ + + /* Enable writes to the chained vm regions */ + for (scan = region_head; scan; scan = scan->next) + { + boolean_t protection_changed = FALSE; + + if (!(scan->protection & VM_PROT_WRITE)) + { + err = vm_protect (task, + scan->start, + scan->length, + FALSE, + scan->protection | VM_PROT_WRITE); + CHK_GOTO_OUT ("vm_protect: enable write failed", err); + } + } + + err = vm_write (task, + low_address, + copied, + aligned_length); + CHK_GOTO_OUT ("vm_write failed", err); + + /* Set up the original region protections, if they were changed */ + for (scan = region_head; scan; scan = scan->next) + { + boolean_t protection_changed = FALSE; + + if (!(scan->protection & VM_PROT_WRITE)) + { + err = vm_protect (task, + scan->start, + scan->length, + FALSE, + scan->protection); + CHK_GOTO_OUT ("vm_protect: enable write failed", err); + } + } + } + + out: + if (deallocate) + { + obstack_free (®ion_obstack, 0); + + (void) vm_deallocate (mach_task_self (), + copied, + copy_count); + } + + if (err != KERN_SUCCESS) + { + warning ("%s: %s", errstr, mach_error_string (err)); + return 0; + } + + return length; +} + +/* Return 0 on failure, number of bytes handled otherwise. */ +static int +gnu_xfer_memory (memaddr, myaddr, len, write, target) + CORE_ADDR memaddr; + char *myaddr; + int len; + int write; + struct target_ops *target; /* IGNORED */ +{ + int result; + task_t task = + current_inferior + ? (current_inferior->task ? current_inferior->task->port : 0) + : 0; + + if (task == MACH_PORT_NULL) + return 0; + else + { + inf_debug (current_inferior, "%s %p[%d] %s %p", + write ? "writing" : "reading", memaddr, len, + write ? "<--" : "-->", myaddr); + if (write) + return gnu_write_inferior (task, memaddr, myaddr, len); + else + return gnu_read_inferior (task, memaddr, myaddr, len); + } +} + +extern void gnu_store_registers (int regno); +extern void gnu_fetch_registers (int regno); + +struct target_ops gnu_ops = { + "GNU", /* to_shortname */ + "GNU Hurd process", /* to_longname */ + "GNU Hurd process", /* to_doc */ + gnu_open, /* to_open */ + 0, /* to_close */ + gnu_attach, /* to_attach */ + gnu_detach, /* to_detach */ + gnu_resume, /* to_resume */ + gnu_wait, /* to_wait */ + gnu_fetch_registers, /* to_fetch_registers */ + gnu_store_registers, /* to_store_registers */ + gnu_prepare_to_store, /* to_prepare_to_store */ + gnu_xfer_memory, /* to_xfer_memory */ + 0, /* to_files_info */ + memory_insert_breakpoint, /* to_insert_breakpoint */ + memory_remove_breakpoint, /* to_remove_breakpoint */ + gnu_terminal_init_inferior, /* to_terminal_init */ + terminal_inferior, /* to_terminal_inferior */ + terminal_ours_for_output, /* to_terminal_ours_for_output */ + terminal_ours, /* to_terminal_ours */ + child_terminal_info, /* to_terminal_info */ + gnu_kill_inferior, /* to_kill */ + 0, /* to_load */ + 0, /* to_lookup_symbol */ + + gnu_create_inferior, /* to_create_inferior */ + gnu_mourn_inferior, /* to_mourn_inferior */ + gnu_can_run, /* to_can_run */ + 0, /* to_notice_signals */ + gnu_thread_alive, /* to_thread_alive */ + gnu_stop, /* to_stop */ + process_stratum, /* to_stratum */ + 0, /* to_next */ + 1, /* to_has_all_memory */ + 1, /* to_has_memory */ + 1, /* to_has_stack */ + 1, /* to_has_registers */ + 1, /* to_has_execution */ + 0, /* sections */ + 0, /* sections_end */ + OPS_MAGIC /* to_magic */ +}; + +char *proc_string (struct proc *proc) +{ + static char tid_str[80]; + if (proc_is_task (proc)) + sprintf (tid_str, "process %d", proc->inf->pid); + else + sprintf (tid_str, "thread %d.%d", + proc->inf->pid, + pid_to_thread_id (proc->tid)); + return tid_str; +} + +char * +gnu_target_pid_to_str (int tid) +{ + struct inf *inf = current_inferior; + struct proc *thread = inf_tid_to_thread (inf, tid); + + if (thread) + return proc_string (thread); + else + { + static char tid_str[80]; + sprintf (tid_str, "bogus thread id %d", tid); + return tid_str; + } +} + +/* User task commands. */ + +struct cmd_list_element *set_task_cmd_list = 0; +struct cmd_list_element *show_task_cmd_list = 0; + +extern struct cmd_list_element *set_thread_default_cmd_list; +extern struct cmd_list_element *show_thread_default_cmd_list; + +static int +_parse_bool_arg (char *args, char *t_val, char *f_val, char *cmd_prefix) +{ + if (!args || strcmp (args, t_val) == 0) + return 1; + else if (strcmp (args, f_val) == 0) + return 0; + else + error ("Illegal argument for \"%s\" command, should be \"%s\" or \"%s\".", + cmd_prefix, t_val, f_val); +} + +#define parse_bool_arg(args, cmd_prefix) \ + _parse_bool_arg (args, "on", "off", cmd_prefix) + +static void +check_empty (char *args, char *cmd_prefix) +{ + if (args) + error ("Garbage after \"%s\" command: `%s'", cmd_prefix, args); +} + +/* Returns the alive thread named by INFERIOR_PID, or signals an error. */ +static struct proc * +cur_thread () +{ + struct inf *inf = cur_inf (); + struct proc *thread = inf_tid_to_thread (inf, inferior_pid); + if (!thread) + error ("No current thread."); + return thread; +} + +static void +set_task_pause_cmd (char *args, int from_tty) +{ + struct inf *inf = cur_inf (); + int old_sc = inf->pause_sc; + + inf->pause_sc = parse_bool_arg (args, "set task pause"); + + if (old_sc == 0 && inf->pause_sc != 0) + /* If the task is currently unsuspended, immediately suspend it, + otherwise wait until the next time it gets control. */ + inf_suspend (inf); +} + +static void +show_task_pause_cmd (char *args, int from_tty) +{ + struct inf *inf = cur_inf (); + check_empty (args, "show task pause"); + printf_unfiltered ("The inferior task %s suspended while gdb has control.\n", + inf->task + ? (inf->pause_sc == 0 ? "isn't" : "is") + : (inf->pause_sc == 0 ? "won't be" : "will be")); +} + +static void +set_thread_default_pause_cmd (char *args, int from_tty) +{ + struct inf *inf = cur_inf (); + inf->default_thread_pause_sc = + parse_bool_arg (args, "set thread default pause") ? 0 : 1; +} + +static void +show_thread_default_pause_cmd (char *args, int from_tty) +{ + struct inf *inf = cur_inf (); + int sc = inf->default_thread_pause_sc; + check_empty (args, "show thread default pause"); + printf_unfiltered ("New threads %s suspended while gdb has control%s.\n", + sc ? "are" : "aren't", + !sc && inf->pause_sc ? "(but the task is)" : ""); +} + +static void +set_thread_default_run_cmd (char *args, int from_tty) +{ + struct inf *inf = cur_inf (); + inf->default_thread_run_sc = + parse_bool_arg (args, "set thread default run") ? 0 : 1; +} + +static void +show_thread_default_run_cmd (char *args, int from_tty) +{ + struct inf *inf = cur_inf (); + check_empty (args, "show thread default run"); + printf_unfiltered ("New threads %s allowed to run.\n", + inf->default_thread_run_sc == 0 ? "are" : "aren't"); +} + +/* Steal a send right called NAME in the inferior task, and make it PROC's + saved exception port. */ +static void +steal_exc_port (struct proc *proc, mach_port_t name) +{ + error_t err; + mach_port_t port; + mach_msg_type_name_t port_type; + + if (!proc || !proc->inf->task) + error ("No inferior task."); + + err = mach_port_extract_right (proc->inf->task->port, + name, MACH_MSG_TYPE_COPY_SEND, + &port, &port_type); + if (err) + error ("Couldn't extract send right %d from inferior: %s", + name, strerror (err)); + + if (proc->saved_exc_port) + /* Get rid of our reference to the old one. */ + mach_port_deallocate (mach_task_self (), proc->saved_exc_port); + + proc->saved_exc_port = port; + + if (! proc->exc_port) + /* If PROC is a thread, we may not have set its exception port before. + We can't use proc_steal_exc_port because it also sets saved_exc_port. */ + { + proc->exc_port = proc->inf->event_port; + err = proc_set_exception_port (proc, proc->exc_port); + error ("Can't set exception port for %s: %s", + proc_string (proc), strerror (err)); + } +} + +static void +set_task_exc_port_cmd (char *args, int from_tty) +{ + struct inf *inf = cur_inf (); + if (!args) + error ("No argument to \"set task exception-port\" command."); + steal_exc_port (inf->task, parse_and_eval_address (args)); +} + +static void +set_signals_cmd (char *args, int from_tty) +{ + int trace; + struct inf *inf = cur_inf (); + + inf->want_signals = parse_bool_arg (args, "set signals"); + + if (inf->task && inf->want_signals != inf->traced) + /* Make this take effect immediately in a running process. */ + inf_set_traced (inf, inf->want_signals); +} + +static void +show_signals_cmd (char *args, int from_tty) +{ + struct inf *inf = cur_inf (); + check_empty (args, "show signals"); + printf_unfiltered ("The inferior process's signals %s intercepted.\n", + inf->task + ? (inf->traced ? "are" : "aren't") + : (inf->want_signals ? "will be" : "won't be")); +} + +static void +set_stopped_cmd (char *args, int from_tty) +{ + cur_inf ()->stopped = _parse_bool_arg (args, "yes", "no", "set stopped"); +} + +static void +show_stopped_cmd (char *args, int from_tty) +{ + struct inf *inf = cur_inf (); + check_empty (args, "show stopped"); + if (! inf->task) + error ("No current process."); + printf_unfiltered ("The inferior process %s stopped.\n", + inf->stopped ? "is" : "isn't"); +} + +static void +set_sig_thread_cmd (char *args, int from_tty) +{ + int tid; + struct inf *inf = cur_inf (); + + if (!args || (! isdigit (*args) && strcmp (args, "none") != 0)) + error ("Illegal argument to \"set signal-thread\" command.\n" + "Should be an integer thread ID, or `none'."); + + if (strcmp (args, "none") == 0) + inf->signal_thread = 0; + else + { + int tid = thread_id_to_pid (atoi (args)); + if (tid < 0) + error ("Thread ID %s not known. Use the \"info threads\" command to\n" + "see the IDs of currently known threads.", args); + inf->signal_thread = inf_tid_to_thread (inf, tid); + } +} + +static void +show_sig_thread_cmd (char *args, int from_tty) +{ + struct inf *inf = cur_inf (); + check_empty (args, "show signal-thread"); + if (! inf->task) + error ("No current process."); + if (inf->signal_thread) + printf_unfiltered ("The signal thread is %s.\n", + proc_string (inf->signal_thread)); + else + printf_unfiltered ("There is no signal thread.\n"); +} + +static void +set_exceptions_cmd (char *args, int from_tty) +{ + struct inf *inf = cur_inf (); + int val = parse_bool_arg (args, "set exceptions"); + + if (inf->task && inf->want_exceptions != val) + /* Make this take effect immediately in a running process. */ + /* XXX */; + + inf->want_exceptions = val; +} + +static void +show_exceptions_cmd (char *args, int from_tty) +{ + struct inf *inf = cur_inf (); + check_empty (args, "show exceptions"); + printf_unfiltered ("Exceptions in the inferior %s trapped.\n", + inf->task + ? (inf->want_exceptions ? "are" : "aren't") + : (inf->want_exceptions ? "will be" : "won't be")); +} + +static void +set_task_cmd (char *args, int from_tty) +{ + printf_unfiltered ("\"set task\" must be followed by the name of a task property.\n"); +} + +static void +show_task_cmd (char *args, int from_tty) +{ + struct inf *inf = cur_inf (); + + check_empty (args, "show task"); + + show_signals_cmd (0, from_tty); + show_exceptions_cmd (0, from_tty); + show_task_pause_cmd (0, from_tty); + + if (inf->pause_sc == 0) + show_thread_default_pause_cmd (0, from_tty); + show_thread_default_run_cmd (0, from_tty); + + if (inf->task) + { + show_stopped_cmd (0, from_tty); + show_sig_thread_cmd (0, from_tty); + } +} + +static void add_task_commands () +{ + add_cmd ("pause", class_run, set_thread_default_pause_cmd, + "Set whether the new threads are suspended while gdb has control.\n" + "This property normally has no effect because the whole task is\n" + "suspended, however, that may be disabled with \"set task pause off\".\n" + "The default value is \"off\".", + &set_thread_default_cmd_list); + add_cmd ("pause", no_class, show_thread_default_pause_cmd, + "Show whether new threads are suspended while gdb has control.", + &show_thread_default_cmd_list); + add_cmd ("run", class_run, set_thread_default_run_cmd, + "Set whether new threads are allowed to run (once gdb has noticed them).", + &set_thread_default_cmd_list); + add_cmd ("run", no_class, show_thread_default_run_cmd, + "Show whether new threads are allowed to run (once gdb has noticed +them).", + &show_thread_default_cmd_list); + + add_cmd ("signals", class_run, set_signals_cmd, + "Set whether the inferior process's signals will be intercepted.\n" + "Mach exceptions (such as breakpoint traps) are not affected.", + &setlist); + add_alias_cmd ("sigs", "signals", class_run, 1, &setlist); + add_cmd ("signals", no_class, show_signals_cmd, + "Show whether the inferior process's signals will be intercepted.", + &showlist); + add_alias_cmd ("sigs", "signals", no_class, 1, &showlist); + + add_cmd ("signal-thread", class_run, set_sig_thread_cmd, + "Set the thread that gdb thinks is the libc signal thread.\n" + "This thread is run when delivering a signal to a non-stopped process.", + &setlist); + add_alias_cmd ("sigthread", "signal-thread", class_run, 1, &setlist); + add_cmd ("signal-thread", no_class, show_sig_thread_cmd, + "Set the thread that gdb thinks is the libc signal thread.", + &showlist); + add_alias_cmd ("sigthread", "signal-thread", no_class, 1, &showlist); + + add_cmd ("stopped", class_run, set_stopped_cmd, + "Set whether gdb thinks the inferior process is stopped as with SIGSTOP.\n" + "Stopped process will be continued by sending them a signal.", + &setlist); + add_cmd ("stopped", no_class, show_signals_cmd, + "Show whether gdb thinks the inferior process is stopped as with SIGSTOP.", + &showlist); + + add_cmd ("exceptions", class_run, set_exceptions_cmd, + "Set whether exceptions in the inferior process will be trapped.\n" + "When exceptions are turned off, neither breakpoints nor single-stepping\n" + "will work.", + &setlist); + /* Allow `set exc' despite conflict with `set exception-port'. */ + add_alias_cmd ("exc", "exceptions", class_run, 1, &setlist); + add_cmd ("exceptions", no_class, show_exceptions_cmd, + "Show whether exceptions in the inferior process will be trapped.", + &showlist); + + + + add_prefix_cmd ("task", no_class, set_task_cmd, + "Command prefix for setting task attributes.", + &set_task_cmd_list, "set task ", 0, &setlist); + add_prefix_cmd ("task", no_class, show_task_cmd, + "Command prefix for showing task attributes.", + &show_task_cmd_list, "show task ", 0, &showlist); + + add_cmd ("pause", class_run, set_task_pause_cmd, + "Set whether the task is suspended while gdb has control.\n" + "A value of \"on\" takes effect immediately, otherwise nothing\n" + "happens until the next time the program is continued.\n" + "When setting this to \"off\", \"set thread default pause on\"\n" + "can be used to pause individual threads by default instead.", + &set_task_cmd_list); + add_cmd ("pause", no_class, show_task_pause_cmd, + "Show whether the task is suspended while gdb has control.", + &show_task_cmd_list); + + add_cmd ("exception-port", no_class, set_task_exc_port_cmd, + "Set the task exception port to which we forward exceptions.\n" + "The argument should be the value of the send right in the task.", + &set_task_cmd_list); + add_alias_cmd ("excp", "exception-port", no_class, 1, &set_task_cmd_list); + add_alias_cmd ("exc-port", "exception-port", no_class, 1, &set_task_cmd_list); +} + +/* User thread commands. */ + +extern struct cmd_list_element *set_thread_cmd_list; +extern struct cmd_list_element *show_thread_cmd_list; + +static void +set_thread_pause_cmd (char *args, int from_tty) +{ + struct proc *thread = cur_thread (); + int old_sc = thread->pause_sc; + thread->pause_sc = parse_bool_arg (args, "set thread pause"); + if (old_sc == 0 && thread->pause_sc != 0 && thread->inf->pause_sc == 0) + /* If the task is currently unsuspended, immediately suspend it, + otherwise wait until the next time it gets control. */ + inf_suspend (thread->inf); +} + +static void +show_thread_pause_cmd (char *args, int from_tty) +{ + struct proc *thread = cur_thread (); + int sc = thread->pause_sc; + check_empty (args, "show task pause"); + printf_unfiltered ("Thread %s %s suspended while gdb has control%s.\n", + proc_string (thread), + sc ? "is" : "isn't", + !sc && thread->inf->pause_sc ? "(but the task is)" : ""); +} + +static void +set_thread_run_cmd (char *args, int from_tty) +{ + struct proc *thread = cur_thread (); + thread->run_sc = parse_bool_arg (args, "set thread run") ? 0 : 1; +} + +static void +show_thread_run_cmd (char *args, int from_tty) +{ + struct proc *thread = cur_thread (); + check_empty (args, "show thread run"); + printf_unfiltered ("Thread %s allowed to run.", + proc_string (thread), + thread->run_sc == 0 ? "is" : "isn't"); +} + +static void +set_thread_exc_port_cmd (char *args, int from_tty) +{ + struct proc *thread = cur_thread (); + if (!args) + error ("No argument to \"set thread exception-port\" command."); + steal_exc_port (thread, parse_and_eval_address (args)); +} + +static void +set_thread_cmd (char *args, int from_tty) +{ + printf_unfiltered ("\"set thread\" must be followed by the name of a thread property.\n"); +} + +static void +show_thread_cmd (char *args, int from_tty) +{ + check_empty (args, "show thread"); + show_thread_run_cmd (0, from_tty); + show_thread_pause_cmd (0, from_tty); +} + +add_thread_commands () +{ + add_cmd ("pause", class_run, set_thread_pause_cmd, + "Set whether the current thread is suspended while gdb has control.\n" + "A value of \"on\" takes effect immediately, otherwise nothing\n" + "happens until the next time the program is continued. This\n" + "property normally has no effect because the whole task is suspended,\n" + "however, that may be disabled with \"set task pause off\".\n" + "The default value is \"off\".", + &set_thread_cmd_list); + add_cmd ("pause", no_class, show_thread_pause_cmd, + "Show whether the current thread is suspended while gdb has control.", + &show_thread_cmd_list); + + add_cmd ("run", class_run, set_thread_run_cmd, + "Set whether the current thread is allowed to run.", + &set_thread_cmd_list); + add_cmd ("run", no_class, show_thread_run_cmd, + "Show whether the current thread is allowed to run.", + &show_thread_cmd_list); + + add_cmd ("exception-port", no_class, set_thread_exc_port_cmd, + "Set the exception port to which we forward exceptions for the\n" + "current thread, overriding the task exception port.\n" + "The argument should be the value of the send right in the task.", + &set_thread_cmd_list); + add_alias_cmd ("excp", "exception-port", no_class, 1, &set_thread_cmd_list); + add_alias_cmd ("exc-port", "exception-port", no_class, 1, &set_thread_cmd_list); +} + +void +_initialize_gnu_nat () +{ + proc_server = getproc (); + + add_target (&gnu_ops); + + add_task_commands (); + add_thread_commands (); + +#if MAINTENANCE_CMDS + add_set_cmd ("gnu-debug", class_maintenance, + var_boolean, (char *)&gnu_debug_flag, + "Set debugging output for the gnu backend.", &maintenancelist); +#endif +} + +#ifdef FLUSH_INFERIOR_CACHE + +/* When over-writing code on some machines the I-Cache must be flushed + explicitly, because it is not kept coherent by the lazy hardware. + This definitely includes breakpoints, for instance, or else we + end up looping in mysterious Bpt traps */ + +void +flush_inferior_icache(pc, amount) + CORE_ADDR pc; +{ + vm_machine_attribute_val_t flush = MATTR_VAL_ICACHE_FLUSH; + error_t ret; + + ret = vm_machine_attribute (current_inferior->task->port, + pc, + amount, + MATTR_CACHE, + &flush); + if (ret != KERN_SUCCESS) + warning ("Error flushing inferior's cache : %s", strerror (ret)); +} +#endif FLUSH_INFERIOR_CACHE |