| /* Low level interface to ptrace, for the remote server for GDB. |
| Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, |
| 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "server.h" |
| #include "linux-low.h" |
| |
| #include <sys/wait.h> |
| #include <stdio.h> |
| #include <sys/param.h> |
| #include <sys/ptrace.h> |
| #include <signal.h> |
| #include <sys/ioctl.h> |
| #include <fcntl.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <sys/syscall.h> |
| #include <sched.h> |
| #include <ctype.h> |
| #include <pwd.h> |
| #include <sys/types.h> |
| #include <dirent.h> |
| |
| #ifndef PTRACE_GETSIGINFO |
| # define PTRACE_GETSIGINFO 0x4202 |
| # define PTRACE_SETSIGINFO 0x4203 |
| #endif |
| |
| #ifndef O_LARGEFILE |
| #define O_LARGEFILE 0 |
| #endif |
| |
| /* If the system headers did not provide the constants, hard-code the normal |
| values. */ |
| #ifndef PTRACE_EVENT_FORK |
| |
| #define PTRACE_SETOPTIONS 0x4200 |
| #define PTRACE_GETEVENTMSG 0x4201 |
| |
| /* options set using PTRACE_SETOPTIONS */ |
| #define PTRACE_O_TRACESYSGOOD 0x00000001 |
| #define PTRACE_O_TRACEFORK 0x00000002 |
| #define PTRACE_O_TRACEVFORK 0x00000004 |
| #define PTRACE_O_TRACECLONE 0x00000008 |
| #define PTRACE_O_TRACEEXEC 0x00000010 |
| #define PTRACE_O_TRACEVFORKDONE 0x00000020 |
| #define PTRACE_O_TRACEEXIT 0x00000040 |
| |
| /* Wait extended result codes for the above trace options. */ |
| #define PTRACE_EVENT_FORK 1 |
| #define PTRACE_EVENT_VFORK 2 |
| #define PTRACE_EVENT_CLONE 3 |
| #define PTRACE_EVENT_EXEC 4 |
| #define PTRACE_EVENT_VFORK_DONE 5 |
| #define PTRACE_EVENT_EXIT 6 |
| |
| #endif /* PTRACE_EVENT_FORK */ |
| |
| /* We can't always assume that this flag is available, but all systems |
| with the ptrace event handlers also have __WALL, so it's safe to use |
| in some contexts. */ |
| #ifndef __WALL |
| #define __WALL 0x40000000 /* Wait for any child. */ |
| #endif |
| |
| #ifdef __UCLIBC__ |
| #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__)) |
| #define HAS_NOMMU |
| #endif |
| #endif |
| |
| /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol |
| representation of the thread ID. |
| |
| ``all_processes'' is keyed by the process ID - which on Linux is (presently) |
| the same as the LWP ID. */ |
| |
| struct inferior_list all_processes; |
| |
| /* A list of all unknown processes which receive stop signals. Some other |
| process will presumably claim each of these as forked children |
| momentarily. */ |
| |
| struct inferior_list stopped_pids; |
| |
| /* FIXME this is a bit of a hack, and could be removed. */ |
| int stopping_threads; |
| |
| /* 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. */ |
| static int new_inferior; |
| |
| static void linux_resume_one_process (struct inferior_list_entry *entry, |
| int step, int signal, siginfo_t *info); |
| static void linux_resume (struct thread_resume *resume_info); |
| static void stop_all_processes (void); |
| static int linux_wait_for_event (struct thread_info *child); |
| static int check_removed_breakpoint (struct process_info *event_child); |
| static void *add_process (unsigned long pid); |
| static int my_waitpid (int pid, int *status, int flags); |
| |
| struct pending_signals |
| { |
| int signal; |
| siginfo_t info; |
| struct pending_signals *prev; |
| }; |
| |
| #define PTRACE_ARG3_TYPE long |
| #define PTRACE_XFER_TYPE long |
| |
| #ifdef HAVE_LINUX_REGSETS |
| static char *disabled_regsets; |
| static int num_regsets; |
| #endif |
| |
| #define pid_of(proc) ((proc)->head.id) |
| |
| /* FIXME: Delete eventually. */ |
| #define inferior_pid (pid_of (get_thread_process (current_inferior))) |
| |
| static void |
| handle_extended_wait (struct process_info *event_child, int wstat) |
| { |
| int event = wstat >> 16; |
| struct process_info *new_process; |
| |
| if (event == PTRACE_EVENT_CLONE) |
| { |
| unsigned long new_pid; |
| int ret, status = W_STOPCODE (SIGSTOP); |
| |
| ptrace (PTRACE_GETEVENTMSG, inferior_pid, 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)) |
| { |
| /* The new child has a pending SIGSTOP. We can't affect it until it |
| hits the SIGSTOP, but we're already attached. */ |
| |
| ret = my_waitpid (new_pid, &status, __WALL); |
| |
| if (ret == -1) |
| perror_with_name ("waiting for new child"); |
| else if (ret != new_pid) |
| warning ("wait returned unexpected PID %d", ret); |
| else if (!WIFSTOPPED (status)) |
| warning ("wait returned unexpected status 0x%x", status); |
| } |
| |
| ptrace (PTRACE_SETOPTIONS, new_pid, 0, PTRACE_O_TRACECLONE); |
| |
| new_process = (struct process_info *) add_process (new_pid); |
| add_thread (new_pid, new_process, new_pid); |
| new_thread_notify (thread_id_to_gdb_id (new_process->lwpid)); |
| |
| /* 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_process->stopped = 1; |
| else |
| ptrace (PTRACE_CONT, new_pid, 0, 0); |
| } |
| else |
| { |
| new_process->stop_expected = 1; |
| if (stopping_threads) |
| { |
| new_process->stopped = 1; |
| new_process->status_pending_p = 1; |
| new_process->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)); |
| } |
| |
| /* 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_process (&event_child->head, |
| event_child->stepping, 0, NULL); |
| } |
| } |
| |
| /* This function should only be called if the process got a SIGTRAP. |
| The SIGTRAP could mean several things. |
| |
| On i386, where decr_pc_after_break is non-zero: |
| If we were single-stepping this process using PTRACE_SINGLESTEP, |
| we will get only the one SIGTRAP (even if the instruction we |
| stepped over was a breakpoint). The value of $eip will be the |
| next instruction. |
| If we continue the process using PTRACE_CONT, we will get a |
| SIGTRAP when we hit a breakpoint. The value of $eip will be |
| the instruction after the breakpoint (i.e. needs to be |
| decremented). If we report the SIGTRAP to GDB, we must also |
| report the undecremented PC. If we cancel the SIGTRAP, we |
| must resume at the decremented PC. |
| |
| (Presumably, not yet tested) On a non-decr_pc_after_break machine |
| with hardware or kernel single-step: |
| If we single-step over a breakpoint instruction, our PC will |
| point at the following instruction. If we continue and hit a |
| breakpoint instruction, our PC will point at the breakpoint |
| instruction. */ |
| |
| static CORE_ADDR |
| get_stop_pc (void) |
| { |
| CORE_ADDR stop_pc = (*the_low_target.get_pc) (); |
| |
| if (get_thread_process (current_inferior)->stepping) |
| return stop_pc; |
| else |
| return stop_pc - the_low_target.decr_pc_after_break; |
| } |
| |
| static void * |
| add_process (unsigned long pid) |
| { |
| struct process_info *process; |
| |
| process = (struct process_info *) xmalloc (sizeof (*process)); |
| memset (process, 0, sizeof (*process)); |
| |
| process->head.id = pid; |
| process->lwpid = pid; |
| |
| add_inferior_to_list (&all_processes, &process->head); |
| |
| return process; |
| } |
| |
| /* Start an inferior process and returns its pid. |
| ALLARGS is a vector of program-name and args. */ |
| |
| static int |
| linux_create_inferior (char *program, char **allargs) |
| { |
| void *new_process; |
| int pid; |
| |
| #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
| pid = vfork (); |
| #else |
| pid = fork (); |
| #endif |
| if (pid < 0) |
| perror_with_name ("fork"); |
| |
| if (pid == 0) |
| { |
| ptrace (PTRACE_TRACEME, 0, 0, 0); |
| |
| signal (__SIGRTMIN + 1, SIG_DFL); |
| |
| setpgid (0, 0); |
| |
| execv (program, allargs); |
| if (errno == ENOENT) |
| execvp (program, allargs); |
| |
| fprintf (stderr, "Cannot exec %s: %s.\n", program, |
| strerror (errno)); |
| fflush (stderr); |
| _exit (0177); |
| } |
| |
| new_process = add_process (pid); |
| add_thread (pid, new_process, pid); |
| must_set_ptrace_flags = 1; |
| new_inferior = 1; |
| |
| return pid; |
| } |
| |
| /* Attach to an inferior process. */ |
| |
| void |
| linux_attach_lwp (unsigned long pid) |
| { |
| struct process_info *new_process; |
| |
| if (ptrace (PTRACE_ATTACH, pid, 0, 0) != 0) |
| { |
| if (all_threads.head != NULL) |
| { |
| /* If we fail to attach to an LWP, just warn. */ |
| fprintf (stderr, "Cannot attach to process %ld: %s (%d)\n", pid, |
| 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, |
| strerror (errno), errno); |
| } |
| |
| /* FIXME: This intermittently fails. |
| We need to wait for SIGSTOP first. */ |
| ptrace (PTRACE_SETOPTIONS, pid, 0, PTRACE_O_TRACECLONE); |
| |
| new_process = (struct process_info *) add_process (pid); |
| add_thread (pid, new_process, pid); |
| new_thread_notify (thread_id_to_gdb_id (new_process->lwpid)); |
| |
| /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
| brings it to a halt. |
| |
| There are several cases to consider here: |
| |
| 1) gdbserver has already attached to the process and is being notified |
| of a new thread that is being created. |
| In this case we should ignore that SIGSTOP and resume the process. |
| This is handled below by setting stop_expected = 1. |
| |
| 2) This is the first thread (the process thread), and we're attaching |
| to it via attach_inferior. |
| In this case we want the process thread to stop. |
| This is handled by having linux_attach clear stop_expected after |
| we return. |
| ??? If the process already has several threads we leave the other |
| threads running. |
| |
| 3) GDB is connecting to gdbserver and is requesting an enumeration of all |
| existing threads. |
| In this case we want the thread to stop. |
| FIXME: This case is currently not properly handled. |
| We should wait for the SIGSTOP but don't. Things work apparently |
| because enough time passes between when we ptrace (ATTACH) and when |
| gdb makes the next ptrace call on the thread. |
| |
| On the other hand, if we are currently trying to stop all threads, we |
| should treat the new thread as if we had sent it a SIGSTOP. This works |
| because we are guaranteed that the add_process call above added us to the |
| end of the list, and so the new thread has not yet reached |
| wait_for_sigstop (but will). */ |
| if (! stopping_threads) |
| new_process->stop_expected = 1; |
| } |
| |
| int |
| linux_attach (unsigned long pid) |
| { |
| struct process_info *process; |
| |
| linux_attach_lwp (pid); |
| |
| /* Don't ignore the initial SIGSTOP if we just attached to this process. |
| It will be collected by wait shortly. */ |
| process = (struct process_info *) find_inferior_id (&all_processes, pid); |
| process->stop_expected = 0; |
| |
| new_inferior = 1; |
| |
| return 0; |
| } |
| |
| /* Kill the inferior process. Make us have no inferior. */ |
| |
| static void |
| linux_kill_one_process (struct inferior_list_entry *entry) |
| { |
| struct thread_info *thread = (struct thread_info *) entry; |
| struct process_info *process = get_thread_process (thread); |
| int wstat; |
| |
| /* 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; |
| |
| do |
| { |
| ptrace (PTRACE_KILL, pid_of (process), 0, 0); |
| |
| /* Make sure it died. The loop is most likely unnecessary. */ |
| wstat = linux_wait_for_event (thread); |
| } while (WIFSTOPPED (wstat)); |
| } |
| |
| static void |
| linux_kill (void) |
| { |
| struct thread_info *thread = (struct thread_info *) all_threads.head; |
| struct process_info *process; |
| int wstat; |
| |
| if (thread == NULL) |
| return; |
| |
| for_each_inferior (&all_threads, linux_kill_one_process); |
| |
| /* See the comment in linux_kill_one_process. We did not kill the first |
| thread in the list, so do so now. */ |
| process = get_thread_process (thread); |
| do |
| { |
| ptrace (PTRACE_KILL, pid_of (process), 0, 0); |
| |
| /* Make sure it died. The loop is most likely unnecessary. */ |
| wstat = linux_wait_for_event (thread); |
| } while (WIFSTOPPED (wstat)); |
| |
| clear_inferiors (); |
| free (all_processes.head); |
| all_processes.head = all_processes.tail = NULL; |
| } |
| |
| static void |
| linux_detach_one_process (struct inferior_list_entry *entry) |
| { |
| struct thread_info *thread = (struct thread_info *) entry; |
| struct process_info *process = get_thread_process (thread); |
| |
| /* Make sure the process isn't stopped at a breakpoint that's |
| no longer there. */ |
| check_removed_breakpoint (process); |
| |
| /* If this process is stopped but is expecting a SIGSTOP, then make |
| sure we take care of that now. This isn't absolutely guaranteed |
| to collect the SIGSTOP, but is fairly likely to. */ |
| if (process->stop_expected) |
| { |
| /* Clear stop_expected, so that the SIGSTOP will be reported. */ |
| process->stop_expected = 0; |
| if (process->stopped) |
| linux_resume_one_process (&process->head, 0, 0, NULL); |
| linux_wait_for_event (thread); |
| } |
| |
| /* Flush any pending changes to the process's registers. */ |
| regcache_invalidate_one ((struct inferior_list_entry *) |
| get_process_thread (process)); |
| |
| /* Finally, let it resume. */ |
| ptrace (PTRACE_DETACH, pid_of (process), 0, 0); |
| } |
| |
| static int |
| linux_detach (void) |
| { |
| delete_all_breakpoints (); |
| for_each_inferior (&all_threads, linux_detach_one_process); |
| clear_inferiors (); |
| free (all_processes.head); |
| all_processes.head = all_processes.tail = NULL; |
| return 0; |
| } |
| |
| static void |
| linux_join (void) |
| { |
| extern unsigned long signal_pid; |
| int status, ret; |
| |
| do { |
| ret = waitpid (signal_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) |
| { |
| if (find_inferior_id (&all_threads, lwpid) != NULL) |
| return 1; |
| else |
| return 0; |
| } |
| |
| /* Return nonzero if this process stopped at a breakpoint which |
| no longer appears to be inserted. Also adjust the PC |
| appropriately to resume where the breakpoint used to be. */ |
| static int |
| check_removed_breakpoint (struct process_info *event_child) |
| { |
| CORE_ADDR stop_pc; |
| struct thread_info *saved_inferior; |
| |
| if (event_child->pending_is_breakpoint == 0) |
| return 0; |
| |
| if (debug_threads) |
| fprintf (stderr, "Checking for breakpoint in process %ld.\n", |
| event_child->lwpid); |
| |
| saved_inferior = current_inferior; |
| current_inferior = get_process_thread (event_child); |
| |
| stop_pc = get_stop_pc (); |
| |
| /* If the PC has changed since we stopped, then we shouldn't do |
| anything. This happens if, for instance, GDB handled the |
| decr_pc_after_break subtraction itself. */ |
| if (stop_pc != event_child->pending_stop_pc) |
| { |
| if (debug_threads) |
| fprintf (stderr, "Ignoring, PC was changed. Old PC was 0x%08llx\n", |
| event_child->pending_stop_pc); |
| |
| event_child->pending_is_breakpoint = 0; |
| current_inferior = saved_inferior; |
| return 0; |
| } |
| |
| /* If the breakpoint is still there, we will report hitting it. */ |
| if ((*the_low_target.breakpoint_at) (stop_pc)) |
| { |
| if (debug_threads) |
| fprintf (stderr, "Ignoring, breakpoint is still present.\n"); |
| current_inferior = saved_inferior; |
| return 0; |
| } |
| |
| if (debug_threads) |
| fprintf (stderr, "Removed breakpoint.\n"); |
| |
| /* For decr_pc_after_break targets, here is where we perform the |
| 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); |
| |
| /* We consumed the pending SIGTRAP. */ |
| event_child->pending_is_breakpoint = 0; |
| event_child->status_pending_p = 0; |
| event_child->status_pending = 0; |
| |
| current_inferior = saved_inferior; |
| return 1; |
| } |
| |
| /* Return 1 if this process has an interesting status pending. This function |
| may silently resume an inferior process. */ |
| static int |
| status_pending_p (struct inferior_list_entry *entry, void *dummy) |
| { |
| struct process_info *process = (struct process_info *) entry; |
| |
| if (process->status_pending_p) |
| if (check_removed_breakpoint (process)) |
| { |
| /* This thread was stopped at a breakpoint, and the breakpoint |
| is now gone. We were told to continue (or step...) all threads, |
| so GDB isn't trying to single-step past this 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_process (&process->head, 0, 0, NULL); |
| return 0; |
| } |
| |
| return process->status_pending_p; |
| } |
| |
| static void |
| linux_wait_for_process (struct process_info **childp, int *wstatp) |
| { |
| int ret; |
| int to_wait_for = -1; |
| |
| if (*childp != NULL) |
| to_wait_for = (*childp)->lwpid; |
| |
| retry: |
| while (1) |
| { |
| ret = waitpid (to_wait_for, wstatp, WNOHANG); |
| |
| if (ret == -1) |
| { |
| if (errno != ECHILD) |
| perror_with_name ("waitpid"); |
| } |
| else if (ret > 0) |
| break; |
| |
| ret = waitpid (to_wait_for, wstatp, WNOHANG | __WCLONE); |
| |
| if (ret == -1) |
| { |
| if (errno != ECHILD) |
| perror_with_name ("waitpid (WCLONE)"); |
| } |
| else if (ret > 0) |
| break; |
| |
| usleep (1000); |
| } |
| |
| if (debug_threads |
| && (!WIFSTOPPED (*wstatp) |
| || (WSTOPSIG (*wstatp) != 32 |
| && WSTOPSIG (*wstatp) != 33))) |
| fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); |
| |
| if (to_wait_for == -1) |
| *childp = (struct process_info *) find_inferior_id (&all_processes, 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)) |
| { |
| add_pid_to_list (&stopped_pids, ret); |
| goto retry; |
| } |
| else if (*childp == NULL) |
| goto retry; |
| |
| (*childp)->stopped = 1; |
| (*childp)->pending_is_breakpoint = 0; |
| |
| (*childp)->last_status = *wstatp; |
| |
| /* Architecture-specific setup after inferior is running. |
| This needs to happen after we have attached to the inferior |
| and it is stopped for the first time, but before we access |
| any inferior registers. */ |
| if (new_inferior) |
| { |
| the_low_target.arch_setup (); |
| #ifdef HAVE_LINUX_REGSETS |
| memset (disabled_regsets, 0, num_regsets); |
| #endif |
| new_inferior = 0; |
| } |
| |
| if (debug_threads |
| && WIFSTOPPED (*wstatp)) |
| { |
| struct thread_info *saved_inferior = current_inferior; |
| 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 (); |
| current_inferior = saved_inferior; |
| } |
| } |
| |
| static int |
| linux_wait_for_event (struct thread_info *child) |
| { |
| CORE_ADDR stop_pc; |
| struct process_info *event_child; |
| int wstat; |
| int bp_status; |
| |
| /* Check for a process 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) |
| { |
| event_child = (struct process_info *) |
| find_inferior (&all_processes, status_pending_p, NULL); |
| if (debug_threads && event_child) |
| fprintf (stderr, "Got a pending child %ld\n", event_child->lwpid); |
| } |
| else |
| { |
| event_child = get_thread_process (child); |
| if (event_child->status_pending_p |
| && check_removed_breakpoint (event_child)) |
| event_child = NULL; |
| } |
| |
| 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_process_thread (event_child); |
| return wstat; |
| } |
| } |
| |
| /* We only enter this loop if no process has a pending wait status. Thus |
| any action taken in response to a wait status inside this loop is |
| responding as soon as we detect the status, not after any pending |
| events. */ |
| while (1) |
| { |
| if (child == NULL) |
| event_child = NULL; |
| else |
| event_child = get_thread_process (child); |
| |
| linux_wait_for_process (&event_child, &wstat); |
| |
| if (event_child == NULL) |
| error ("event from unknown child"); |
| |
| current_inferior = (struct thread_info *) |
| find_inferior_id (&all_threads, event_child->lwpid); |
| |
| /* Check for thread exit. */ |
| if (! WIFSTOPPED (wstat)) |
| { |
| if (debug_threads) |
| fprintf (stderr, "LWP %ld exiting\n", event_child->head.id); |
| |
| /* If the last thread is exiting, just return. */ |
| if (all_threads.head == all_threads.tail) |
| return wstat; |
| |
| dead_thread_notify (thread_id_to_gdb_id (event_child->lwpid)); |
| |
| remove_inferior (&all_processes, &event_child->head); |
| free (event_child); |
| remove_thread (current_inferior); |
| current_inferior = (struct thread_info *) all_threads.head; |
| |
| /* If we were waiting for this particular child to do something... |
| well, it did something. */ |
| if (child != NULL) |
| return wstat; |
| |
| /* Wait for a more interesting event. */ |
| continue; |
| } |
| |
| 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_process (&event_child->head, |
| event_child->stepping, 0, NULL); |
| continue; |
| } |
| |
| if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
| && wstat >> 16 != 0) |
| { |
| handle_extended_wait (event_child, wstat); |
| continue; |
| } |
| |
| /* If GDB is not interested in this signal, don't stop other |
| threads, and don't report it to GDB. Just resume the |
| inferior right away. We do this for threading-related |
| signals as well as any that GDB specifically requested we |
| ignore. But never ignore SIGSTOP if we sent it ourselves, |
| and do not ignore signals when stepping - they may require |
| special handling to skip the signal handler. */ |
| /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
| thread library? */ |
| if (WIFSTOPPED (wstat) |
| && !event_child->stepping |
| && ( |
| #ifdef USE_THREAD_DB |
| (thread_db_active && (WSTOPSIG (wstat) == __SIGRTMIN |
| || WSTOPSIG (wstat) == __SIGRTMIN + 1)) |
| || |
| #endif |
| (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); |
| |
| if (ptrace (PTRACE_GETSIGINFO, event_child->lwpid, 0, &info) == 0) |
| info_p = &info; |
| else |
| info_p = NULL; |
| linux_resume_one_process (&event_child->head, |
| event_child->stepping, |
| 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 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; |
| |
| stop_pc = get_stop_pc (); |
| |
| /* bp_reinsert will only be set if we were single-stepping. |
| Notice that we will resume the process after hitting |
| a gdbserver breakpoint; single-stepping to/over one |
| is not supported (yet). */ |
| if (event_child->bp_reinsert != 0) |
| { |
| if (debug_threads) |
| fprintf (stderr, "Reinserted breakpoint.\n"); |
| reinsert_breakpoint (event_child->bp_reinsert); |
| event_child->bp_reinsert = 0; |
| |
| /* Clear the single-stepping flag and SIGTRAP as we resume. */ |
| linux_resume_one_process (&event_child->head, 0, 0, NULL); |
| continue; |
| } |
| |
| bp_status = check_breakpoints (stop_pc); |
| |
| if (bp_status != 0) |
| { |
| if (debug_threads) |
| fprintf (stderr, "Hit a gdbserver breakpoint.\n"); |
| |
| /* We hit one of our own breakpoints. We mark it as a pending |
| breakpoint, so that check_removed_breakpoint () will do the PC |
| adjustment for us at the appropriate time. */ |
| event_child->pending_is_breakpoint = 1; |
| event_child->pending_stop_pc = stop_pc; |
| |
| /* We may need to put the breakpoint back. We continue in the event |
| loop instead of simply replacing the breakpoint right away, |
| in order to not lose signals sent to the thread that hit the |
| breakpoint. Unfortunately this increases the window where another |
| thread could sneak past the removed breakpoint. For the current |
| use of server-side breakpoints (thread creation) this is |
| acceptable; but it needs to be considered before this breakpoint |
| mechanism can be used in more general ways. For some breakpoints |
| it may be necessary to stop all other threads, but that should |
| be avoided where possible. |
| |
| If breakpoint_reinsert_addr is NULL, that means that we can |
| use PTRACE_SINGLESTEP on this platform. Uninsert the breakpoint, |
| mark it for reinsertion, and single-step. |
| |
| Otherwise, call the target function to figure out where we need |
| our temporary breakpoint, create it, and continue executing this |
| process. */ |
| if (bp_status == 2) |
| /* No need to reinsert. */ |
| linux_resume_one_process (&event_child->head, 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_process (&event_child->head, 1, 0, NULL); |
| } |
| else |
| { |
| reinsert_breakpoint_by_bp |
| (stop_pc, (*the_low_target.breakpoint_reinsert_addr) ()); |
| linux_resume_one_process (&event_child->head, 0, 0, NULL); |
| } |
| |
| continue; |
| } |
| |
| if (debug_threads) |
| 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. */ |
| if (event_child->stepping) |
| { |
| event_child->stepping = 0; |
| return wstat; |
| } |
| |
| /* 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 |
| accordingly. This will handle both the necessary fiddling with the |
| PC on decr_pc_after_break targets and suppressing extra threads |
| hitting a breakpoint if two hit it at once and then GDB removes it |
| after the first is reported. Arguably it would be better to report |
| multiple threads hitting breakpoints simultaneously, but the current |
| remote protocol does not allow this. */ |
| if ((*the_low_target.breakpoint_at) (stop_pc)) |
| { |
| event_child->pending_is_breakpoint = 1; |
| event_child->pending_stop_pc = stop_pc; |
| } |
| |
| return wstat; |
| } |
| |
| /* NOTREACHED */ |
| return 0; |
| } |
| |
| /* Wait for process, returns status. */ |
| |
| static unsigned char |
| linux_wait (char *status) |
| { |
| int w; |
| struct thread_info *child = NULL; |
| |
| retry: |
| /* 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) |
| { |
| child = (struct thread_info *) find_inferior_id (&all_threads, |
| cont_thread); |
| |
| /* No stepping, no signal - unless one is pending already, of course. */ |
| if (child == 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); |
| } |
| } |
| |
| w = linux_wait_for_event (child); |
| stop_all_processes (); |
| |
| if (must_set_ptrace_flags) |
| { |
| ptrace (PTRACE_SETOPTIONS, inferior_pid, 0, PTRACE_O_TRACECLONE); |
| must_set_ptrace_flags = 0; |
| } |
| |
| /* If we are waiting for a particular child, and it exited, |
| linux_wait_for_event will return its exit status. Similarly if |
| the last child exited. If this is not the last child, however, |
| do not report it as exited until there is a 'thread exited' response |
| available in the remote protocol. Instead, just wait for another event. |
| This should be safe, because if the thread crashed we will already |
| have reported the termination signal to GDB; that should stop any |
| in-progress stepping operations, etc. |
| |
| Report the exit status of the last thread to exit. This matches |
| LinuxThreads' behavior. */ |
| |
| if (all_threads.head == all_threads.tail) |
| { |
| if (WIFEXITED (w)) |
| { |
| fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w)); |
| *status = 'W'; |
| clear_inferiors (); |
| free (all_processes.head); |
| all_processes.head = all_processes.tail = NULL; |
| return WEXITSTATUS (w); |
| } |
| else if (!WIFSTOPPED (w)) |
| { |
| fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w)); |
| *status = 'X'; |
| clear_inferiors (); |
| free (all_processes.head); |
| all_processes.head = all_processes.tail = NULL; |
| return target_signal_from_host (WTERMSIG (w)); |
| } |
| } |
| else |
| { |
| if (!WIFSTOPPED (w)) |
| goto retry; |
| } |
| |
| *status = 'T'; |
| return target_signal_from_host (WSTOPSIG (w)); |
| } |
| |
| /* Send a signal to an LWP. For LinuxThreads, kill is enough; however, if |
| thread groups are in use, we need to use tkill. */ |
| |
| static int |
| kill_lwp (unsigned long lwpid, int signo) |
| { |
| static int tkill_failed; |
| |
| errno = 0; |
| |
| #ifdef SYS_tkill |
| if (!tkill_failed) |
| { |
| int ret = syscall (SYS_tkill, lwpid, signo); |
| if (errno != ENOSYS) |
| return ret; |
| errno = 0; |
| tkill_failed = 1; |
| } |
| #endif |
| |
| return kill (lwpid, signo); |
| } |
| |
| static void |
| send_sigstop (struct inferior_list_entry *entry) |
| { |
| struct process_info *process = (struct process_info *) entry; |
| |
| if (process->stopped) |
| return; |
| |
| /* If we already have a pending stop signal for this process, don't |
| send another. */ |
| if (process->stop_expected) |
| { |
| if (debug_threads) |
| fprintf (stderr, "Have pending sigstop for process %ld\n", |
| process->lwpid); |
| |
| /* We clear the stop_expected flag so that wait_for_sigstop |
| will receive the SIGSTOP event (instead of silently resuming and |
| waiting again). It'll be reset below. */ |
| process->stop_expected = 0; |
| return; |
| } |
| |
| if (debug_threads) |
| fprintf (stderr, "Sending sigstop to process %ld\n", process->head.id); |
| |
| kill_lwp (process->head.id, SIGSTOP); |
| } |
| |
| static void |
| wait_for_sigstop (struct inferior_list_entry *entry) |
| { |
| struct process_info *process = (struct process_info *) entry; |
| struct thread_info *saved_inferior, *thread; |
| int wstat; |
| unsigned long saved_tid; |
| |
| if (process->stopped) |
| return; |
| |
| saved_inferior = current_inferior; |
| saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; |
| thread = (struct thread_info *) find_inferior_id (&all_threads, |
| process->lwpid); |
| wstat = linux_wait_for_event (thread); |
| |
| /* If we stopped with a non-SIGSTOP signal, save it for later |
| and record the pending SIGSTOP. If the process exited, just |
| return. */ |
| if (WIFSTOPPED (wstat) |
| && WSTOPSIG (wstat) != SIGSTOP) |
| { |
| if (debug_threads) |
| fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
| process->lwpid, wstat); |
| process->status_pending_p = 1; |
| process->status_pending = wstat; |
| process->stop_expected = 1; |
| } |
| |
| if (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); |
| } |
| } |
| |
| static void |
| stop_all_processes (void) |
| { |
| stopping_threads = 1; |
| for_each_inferior (&all_processes, send_sigstop); |
| for_each_inferior (&all_processes, wait_for_sigstop); |
| stopping_threads = 0; |
| } |
| |
| /* Resume execution of the inferior process. |
| If STEP is nonzero, single-step it. |
| If SIGNAL is nonzero, give it that signal. */ |
| |
| static void |
| linux_resume_one_process (struct inferior_list_entry *entry, |
| int step, int signal, siginfo_t *info) |
| { |
| struct process_info *process = (struct process_info *) entry; |
| struct thread_info *saved_inferior; |
| |
| if (process->stopped == 0) |
| return; |
| |
| /* If we have pending signals or status, and a new signal, enqueue the |
| signal. Also enqueue the signal if we are waiting to reinsert a |
| breakpoint; it will be picked up again below. */ |
| if (signal != 0 |
| && (process->status_pending_p || process->pending_signals != NULL |
| || process->bp_reinsert != 0)) |
| { |
| struct pending_signals *p_sig; |
| p_sig = xmalloc (sizeof (*p_sig)); |
| p_sig->prev = process->pending_signals; |
| p_sig->signal = signal; |
| if (info == NULL) |
| memset (&p_sig->info, 0, sizeof (siginfo_t)); |
| else |
| memcpy (&p_sig->info, info, sizeof (siginfo_t)); |
| process->pending_signals = p_sig; |
| } |
| |
| if (process->status_pending_p && !check_removed_breakpoint (process)) |
| return; |
| |
| saved_inferior = current_inferior; |
| current_inferior = get_process_thread (process); |
| |
| if (debug_threads) |
| fprintf (stderr, "Resuming process %ld (%s, signal %d, stop %s)\n", inferior_pid, |
| step ? "step" : "continue", signal, |
| process->stop_expected ? "expected" : "not expected"); |
| |
| /* This bit needs some thinking about. If we get a signal that |
| we must report while a single-step reinsert is still pending, |
| we often end up resuming the thread. It might be better to |
| (ew) allow a stack of pending events; then we could be sure that |
| the reinsert happened right away and not lose any signals. |
| |
| Making this stack would also shrink the window in which breakpoints are |
| uninserted (see comment in linux_wait_for_process) but not enough for |
| complete correctness, so it won't solve that problem. It may be |
| worthwhile just to solve this one, however. */ |
| if (process->bp_reinsert != 0) |
| { |
| if (debug_threads) |
| fprintf (stderr, " pending reinsert at %08lx", (long)process->bp_reinsert); |
| if (step == 0) |
| fprintf (stderr, "BAD - reinserting but not stepping.\n"); |
| step = 1; |
| |
| /* Postpone any pending signal. It was enqueued above. */ |
| signal = 0; |
| } |
| |
| check_removed_breakpoint (process); |
| |
| if (debug_threads && the_low_target.get_pc != NULL) |
| { |
| fprintf (stderr, " "); |
| (*the_low_target.get_pc) (); |
| } |
| |
| /* If we have pending signals, consume one unless we are trying to reinsert |
| a breakpoint. */ |
| if (process->pending_signals != NULL && process->bp_reinsert == 0) |
| { |
| struct pending_signals **p_sig; |
| |
| p_sig = &process->pending_signals; |
| while ((*p_sig)->prev != NULL) |
| p_sig = &(*p_sig)->prev; |
| |
| signal = (*p_sig)->signal; |
| if ((*p_sig)->info.si_signo != 0) |
| ptrace (PTRACE_SETSIGINFO, process->lwpid, 0, &(*p_sig)->info); |
| |
| free (*p_sig); |
| *p_sig = NULL; |
| } |
| |
| regcache_invalidate_one ((struct inferior_list_entry *) |
| get_process_thread (process)); |
| errno = 0; |
| process->stopped = 0; |
| process->stepping = step; |
| ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, process->lwpid, 0, signal); |
| |
| current_inferior = saved_inferior; |
| if (errno) |
| { |
| /* ESRCH from ptrace either means that the thread was already |
| running (an error) or that it is gone (a race condition). If |
| it's gone, we will get a notification the next time we wait, |
| so we can ignore the error. We could differentiate these |
| two, but it's tricky without waiting; the thread still exists |
| as a zombie, so sending it signal 0 would succeed. So just |
| ignore ESRCH. */ |
| if (errno == ESRCH) |
| return; |
| |
| perror_with_name ("ptrace"); |
| } |
| } |
| |
| static struct thread_resume *resume_ptr; |
| |
| /* 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 |
| resume request. |
| |
| 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) |
| { |
| struct process_info *process; |
| struct thread_info *thread; |
| int ndx; |
| |
| thread = (struct thread_info *) entry; |
| process = get_thread_process (thread); |
| |
| ndx = 0; |
| while (resume_ptr[ndx].thread != -1 && resume_ptr[ndx].thread != entry->id) |
| ndx++; |
| |
| process->resume = &resume_ptr[ndx]; |
| } |
| |
| /* 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) |
| { |
| struct process_info *process; |
| struct thread_info *thread; |
| int step; |
| |
| thread = (struct thread_info *) entry; |
| process = get_thread_process (thread); |
| |
| if (process->resume->leave_stopped) |
| return; |
| |
| if (process->resume->thread == -1) |
| step = process->stepping || process->resume->step; |
| else |
| step = process->resume->step; |
| |
| linux_resume_one_process (&process->head, step, process->resume->sig, NULL); |
| |
| process->resume = NULL; |
| } |
| |
| /* 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. */ |
| |
| static void |
| linux_queue_one_thread (struct inferior_list_entry *entry) |
| { |
| struct process_info *process; |
| struct thread_info *thread; |
| |
| thread = (struct thread_info *) entry; |
| process = get_thread_process (thread); |
| |
| if (process->resume->leave_stopped) |
| return; |
| |
| /* If we have a new signal, enqueue the signal. */ |
| if (process->resume->sig != 0) |
| { |
| struct pending_signals *p_sig; |
| p_sig = xmalloc (sizeof (*p_sig)); |
| p_sig->prev = process->pending_signals; |
| p_sig->signal = process->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 (process->last_status) |
| && WSTOPSIG (process->last_status) == process->resume->sig) |
| ptrace (PTRACE_GETSIGINFO, process->lwpid, 0, &p_sig->info); |
| |
| process->pending_signals = p_sig; |
| } |
| |
| process->resume = NULL; |
| } |
| |
| /* 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 process_info *process = (struct process_info *) entry; |
| |
| /* Processes which will not be resumed are not interesting, because |
| we might not wait for them next time through linux_wait. */ |
| if (process->resume->leave_stopped) |
| return 0; |
| |
| /* 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 (process->status_pending_p) |
| check_removed_breakpoint (process); |
| |
| if (process->status_pending_p) |
| * (int *) flag_p = 1; |
| |
| return 0; |
| } |
| |
| static void |
| linux_resume (struct thread_resume *resume_info) |
| { |
| int pending_flag; |
| |
| /* Yes, the use of a global here is rather ugly. */ |
| resume_ptr = resume_info; |
| |
| for_each_inferior (&all_threads, linux_set_resume_request); |
| |
| /* 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. */ |
| pending_flag = 0; |
| find_inferior (&all_processes, resume_status_pending_p, &pending_flag); |
| |
| if (debug_threads) |
| { |
| if (pending_flag) |
| fprintf (stderr, "Not resuming, pending status\n"); |
| else |
| 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); |
| } |
| |
| #ifdef HAVE_LINUX_USRREGS |
| |
| int |
| register_addr (int regnum) |
| { |
| int addr; |
| |
| if (regnum < 0 || regnum >= the_low_target.num_regs) |
| error ("Invalid register number %d.", regnum); |
| |
| addr = the_low_target.regmap[regnum]; |
| |
| return addr; |
| } |
| |
| /* Fetch one register. */ |
| static void |
| fetch_register (int regno) |
| { |
| CORE_ADDR regaddr; |
| int i, size; |
| char *buf; |
| |
| if (regno >= the_low_target.num_regs) |
| return; |
| if ((*the_low_target.cannot_fetch_register) (regno)) |
| return; |
| |
| regaddr = register_addr (regno); |
| if (regaddr == -1) |
| return; |
| size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
| & - sizeof (PTRACE_XFER_TYPE); |
| buf = alloca (size); |
| for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
| { |
| errno = 0; |
| *(PTRACE_XFER_TYPE *) (buf + i) = |
| ptrace (PTRACE_PEEKUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, 0); |
| regaddr += sizeof (PTRACE_XFER_TYPE); |
| if (errno != 0) |
| { |
| /* Warning, not error, in case we are attached; sometimes the |
| kernel doesn't let us at the registers. */ |
| char *err = strerror (errno); |
| char *msg = alloca (strlen (err) + 128); |
| sprintf (msg, "reading register %d: %s", regno, err); |
| error (msg); |
| goto error_exit; |
| } |
| } |
| |
| if (the_low_target.supply_ptrace_register) |
| the_low_target.supply_ptrace_register (regno, buf); |
| else |
| supply_register (regno, buf); |
| |
| error_exit:; |
| } |
| |
| /* Fetch all registers, or just one, from the child process. */ |
| static void |
| usr_fetch_inferior_registers (int regno) |
| { |
| if (regno == -1 || regno == 0) |
| for (regno = 0; regno < the_low_target.num_regs; regno++) |
| fetch_register (regno); |
| else |
| fetch_register (regno); |
| } |
| |
| /* Store our register values back into the inferior. |
| If REGNO is -1, do this for all registers. |
| Otherwise, REGNO specifies which register (so we can save time). */ |
| static void |
| usr_store_inferior_registers (int regno) |
| { |
| CORE_ADDR regaddr; |
| int i, size; |
| char *buf; |
| |
| if (regno >= 0) |
| { |
| if (regno >= the_low_target.num_regs) |
| return; |
| |
| if ((*the_low_target.cannot_store_register) (regno) == 1) |
| return; |
| |
| regaddr = register_addr (regno); |
| if (regaddr == -1) |
| return; |
| errno = 0; |
| size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1) |
| & - sizeof (PTRACE_XFER_TYPE); |
| buf = alloca (size); |
| memset (buf, 0, size); |
| |
| if (the_low_target.collect_ptrace_register) |
| the_low_target.collect_ptrace_register (regno, buf); |
| else |
| collect_register (regno, buf); |
| |
| for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
| { |
| errno = 0; |
| ptrace (PTRACE_POKEUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, |
| *(PTRACE_XFER_TYPE *) (buf + i)); |
| if (errno != 0) |
| { |
| /* At this point, ESRCH should mean the process is already gone, |
| in which case we simply ignore attempts to change its registers. |
| See also the related comment in linux_resume_one_process. */ |
| if (errno == ESRCH) |
| return; |
| |
| if ((*the_low_target.cannot_store_register) (regno) == 0) |
| { |
| char *err = strerror (errno); |
| char *msg = alloca (strlen (err) + 128); |
| sprintf (msg, "writing register %d: %s", |
| regno, err); |
| error (msg); |
| return; |
| } |
| } |
| regaddr += sizeof (PTRACE_XFER_TYPE); |
| } |
| } |
| else |
| for (regno = 0; regno < the_low_target.num_regs; regno++) |
| usr_store_inferior_registers (regno); |
| } |
| #endif /* HAVE_LINUX_USRREGS */ |
| |
| |
| |
| #ifdef HAVE_LINUX_REGSETS |
| |
| static int |
| regsets_fetch_inferior_registers () |
| { |
| struct regset_info *regset; |
| int saw_general_regs = 0; |
| |
| regset = target_regsets; |
| |
| while (regset->size >= 0) |
| { |
| void *buf; |
| int res; |
| |
| if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
| { |
| regset ++; |
| continue; |
| } |
| |
| buf = xmalloc (regset->size); |
| #ifndef __sparc__ |
| res = ptrace (regset->get_request, inferior_pid, 0, buf); |
| #else |
| res = ptrace (regset->get_request, inferior_pid, buf, 0); |
| #endif |
| if (res < 0) |
| { |
| if (errno == EIO) |
| { |
| /* If we get EIO on a regset, do not try it again for |
| this process. */ |
| disabled_regsets[regset - target_regsets] = 1; |
| continue; |
| } |
| else |
| { |
| char s[256]; |
| sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%ld", |
| inferior_pid); |
| perror (s); |
| } |
| } |
| else if (regset->type == GENERAL_REGS) |
| saw_general_regs = 1; |
| regset->store_function (buf); |
| regset ++; |
| } |
| if (saw_general_regs) |
| return 0; |
| else |
| return 1; |
| } |
| |
| static int |
| regsets_store_inferior_registers () |
| { |
| struct regset_info *regset; |
| int saw_general_regs = 0; |
| |
| regset = target_regsets; |
| |
| while (regset->size >= 0) |
| { |
| void *buf; |
| int res; |
| |
| if (regset->size == 0 || disabled_regsets[regset - target_regsets]) |
| { |
| regset ++; |
| continue; |
| } |
| |
| buf = xmalloc (regset->size); |
| |
| /* First fill the buffer with the current register set contents, |
| 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); |
| #else |
| res = ptrace (regset->get_request, inferior_pid, buf, 0); |
| #endif |
| |
| if (res == 0) |
| { |
| /* Then overlay our cached registers on that. */ |
| regset->fill_function (buf); |
| |
| /* Only now do we write the register set. */ |
| #ifndef __sparc__ |
| res = ptrace (regset->set_request, inferior_pid, 0, buf); |
| #else |
| res = ptrace (regset->set_request, inferior_pid, buf, 0); |
| #endif |
| } |
| |
| if (res < 0) |
| { |
| if (errno == EIO) |
| { |
| /* If we get EIO on a regset, do not try it again for |
| this process. */ |
| disabled_regsets[regset - target_regsets] = 1; |
| continue; |
| } |
| else if (errno == ESRCH) |
| { |
| /* At this point, ESRCH should mean the process is already gone, |
| in which case we simply ignore attempts to change its registers. |
| See also the related comment in linux_resume_one_process. */ |
| return 0; |
| } |
| else |
| { |
| perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
| } |
| } |
| else if (regset->type == GENERAL_REGS) |
| saw_general_regs = 1; |
| regset ++; |
| free (buf); |
| } |
| if (saw_general_regs) |
| return 0; |
| else |
| return 1; |
| return 0; |
| } |
| |
| #endif /* HAVE_LINUX_REGSETS */ |
| |
| |
| void |
| linux_fetch_registers (int regno) |
| { |
| #ifdef HAVE_LINUX_REGSETS |
| if (regsets_fetch_inferior_registers () == 0) |
| return; |
| #endif |
| #ifdef HAVE_LINUX_USRREGS |
| usr_fetch_inferior_registers (regno); |
| #endif |
| } |
| |
| void |
| linux_store_registers (int regno) |
| { |
| #ifdef HAVE_LINUX_REGSETS |
| if (regsets_store_inferior_registers () == 0) |
| return; |
| #endif |
| #ifdef HAVE_LINUX_USRREGS |
| usr_store_inferior_registers (regno); |
| #endif |
| } |
| |
| |
| /* Copy LEN bytes from inferior's memory starting at MEMADDR |
| to debugger memory starting at MYADDR. */ |
| |
| static int |
| linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
| { |
| register int i; |
| /* Round starting address down to longword boundary. */ |
| register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); |
| /* Round ending address up; get number of longwords that makes. */ |
| register int count |
| = (((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 fd; |
| char filename[64]; |
| |
| /* 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); |
| fd = open (filename, O_RDONLY | O_LARGEFILE); |
| if (fd == -1) |
| goto no_proc; |
| |
| /* If pread64 is available, use it. It's faster if the kernel |
| supports it (only one syscall), and it's 64-bit safe even on |
| 32-bit platforms (for instance, SPARC debugging a SPARC64 |
| application). */ |
| #ifdef HAVE_PREAD64 |
| if (pread64 (fd, myaddr, len, memaddr) != len) |
| #else |
| if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, memaddr, len) != len) |
| #endif |
| { |
| close (fd); |
| goto no_proc; |
| } |
| |
| close (fd); |
| return 0; |
| } |
| |
| no_proc: |
| /* Read all the longwords */ |
| 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); |
| if (errno) |
| return errno; |
| } |
| |
| /* Copy appropriate bytes out of the buffer. */ |
| memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), len); |
| |
| return 0; |
| } |
| |
| /* Copy LEN bytes of data from debugger memory at MYADDR |
| to inferior's memory at MEMADDR. |
| On failure (cannot write the inferior) |
| returns the value of errno. */ |
| |
| static int |
| linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
| { |
| register int i; |
| /* Round starting address down to longword boundary. */ |
| register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); |
| /* Round ending address up; get number of longwords that makes. */ |
| register int count |
| = (((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)); |
| |
| if (debug_threads) |
| { |
| fprintf (stderr, "Writing %02x to %08lx\n", (unsigned)myaddr[0], (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); |
| |
| if (count > 1) |
| { |
| buffer[count - 1] |
| = ptrace (PTRACE_PEEKTEXT, inferior_pid, |
| (PTRACE_ARG3_TYPE) (addr + (count - 1) |
| * sizeof (PTRACE_XFER_TYPE)), |
| 0); |
| } |
| |
| /* Copy data to be written over corresponding part of buffer */ |
| |
| memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); |
| |
| /* Write the entire buffer. */ |
| |
| for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
| { |
| errno = 0; |
| ptrace (PTRACE_POKETEXT, inferior_pid, (PTRACE_ARG3_TYPE) addr, buffer[i]); |
| if (errno) |
| return errno; |
| } |
| |
| return 0; |
| } |
| |
| static int linux_supports_tracefork_flag; |
| |
| /* Helper functions for linux_test_for_tracefork, called via clone (). */ |
| |
| static int |
| linux_tracefork_grandchild (void *arg) |
| { |
| _exit (0); |
| } |
| |
| #define STACK_SIZE 4096 |
| |
| static int |
| linux_tracefork_child (void *arg) |
| { |
| ptrace (PTRACE_TRACEME, 0, 0, 0); |
| kill (getpid (), SIGSTOP); |
| #ifdef __ia64__ |
| __clone2 (linux_tracefork_grandchild, arg, STACK_SIZE, |
| CLONE_VM | SIGCHLD, NULL); |
| #else |
| clone (linux_tracefork_grandchild, arg + STACK_SIZE, |
| CLONE_VM | SIGCHLD, NULL); |
| #endif |
| _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. */ |
| |
| static void |
| linux_test_for_tracefork (void) |
| { |
| int child_pid, ret, status; |
| long second_pid; |
| char *stack = xmalloc (STACK_SIZE * 4); |
| |
| linux_supports_tracefork_flag = 0; |
| |
| /* Use CLONE_VM instead of fork, to support uClinux (no MMU). */ |
| #ifdef __ia64__ |
| child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE, |
| CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); |
| #else |
| child_pid = clone (linux_tracefork_child, stack + STACK_SIZE, |
| CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2); |
| #endif |
| if (child_pid == -1) |
| perror_with_name ("clone"); |
| |
| ret = my_waitpid (child_pid, &status, 0); |
| if (ret == -1) |
| perror_with_name ("waitpid"); |
| else if (ret != child_pid) |
| error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret); |
| if (! WIFSTOPPED (status)) |
| error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status); |
| |
| ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); |
| if (ret != 0) |
| { |
| ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
| if (ret != 0) |
| { |
| warning ("linux_test_for_tracefork: failed to kill child"); |
| return; |
| } |
| |
| ret = my_waitpid (child_pid, &status, 0); |
| if (ret != child_pid) |
| warning ("linux_test_for_tracefork: failed to wait for killed child"); |
| else if (!WIFSIGNALED (status)) |
| warning ("linux_test_for_tracefork: unexpected wait status 0x%x from " |
| "killed child", status); |
| |
| return; |
| } |
| |
| ret = ptrace (PTRACE_CONT, child_pid, 0, 0); |
| if (ret != 0) |
| warning ("linux_test_for_tracefork: failed to resume child"); |
| |
| ret = my_waitpid (child_pid, &status, 0); |
| |
| if (ret == child_pid && WIFSTOPPED (status) |
| && status >> 16 == PTRACE_EVENT_FORK) |
| { |
| second_pid = 0; |
| ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); |
| if (ret == 0 && second_pid != 0) |
| { |
| int second_status; |
| |
| linux_supports_tracefork_flag = 1; |
| my_waitpid (second_pid, &second_status, 0); |
| ret = ptrace (PTRACE_KILL, second_pid, 0, 0); |
| if (ret != 0) |
| warning ("linux_test_for_tracefork: failed to kill second child"); |
| my_waitpid (second_pid, &status, 0); |
| } |
| } |
| else |
| warning ("linux_test_for_tracefork: unexpected result from waitpid " |
| "(%d, status 0x%x)", ret, status); |
| |
| do |
| { |
| ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
| if (ret != 0) |
| warning ("linux_test_for_tracefork: failed to kill child"); |
| my_waitpid (child_pid, &status, 0); |
| } |
| while (WIFSTOPPED (status)); |
| |
| free (stack); |
| } |
| |
| |
| static void |
| linux_look_up_symbols (void) |
| { |
| #ifdef USE_THREAD_DB |
| if (thread_db_active) |
| return; |
| |
| thread_db_active = thread_db_init (!linux_supports_tracefork_flag); |
| #endif |
| } |
| |
| static void |
| linux_request_interrupt (void) |
| { |
| extern unsigned long signal_pid; |
| |
| if (cont_thread != 0 && cont_thread != -1) |
| { |
| struct process_info *process; |
| |
| process = get_thread_process (current_inferior); |
| kill_lwp (process->lwpid, SIGINT); |
| } |
| else |
| kill_lwp (signal_pid, SIGINT); |
| } |
| |
| /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
| to debugger memory starting at MYADDR. */ |
| |
| static int |
| linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
| { |
| char filename[PATH_MAX]; |
| int fd, n; |
| |
| snprintf (filename, sizeof filename, "/proc/%ld/auxv", inferior_pid); |
| |
| fd = open (filename, O_RDONLY); |
| if (fd < 0) |
| return -1; |
| |
| if (offset != (CORE_ADDR) 0 |
| && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) |
| n = -1; |
| else |
| n = read (fd, myaddr, len); |
| |
| close (fd); |
| |
| return n; |
| } |
| |
| /* These 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) |
| { |
| if (the_low_target.insert_watchpoint != NULL) |
| return the_low_target.insert_watchpoint (type, addr, len); |
| else |
| /* Unsupported (see target.h). */ |
| return 1; |
| } |
| |
| static int |
| linux_remove_watchpoint (char type, CORE_ADDR addr, int len) |
| { |
| if (the_low_target.remove_watchpoint != NULL) |
| return the_low_target.remove_watchpoint (type, addr, len); |
| else |
| /* Unsupported (see target.h). */ |
| return 1; |
| } |
| |
| static int |
| linux_stopped_by_watchpoint (void) |
| { |
| if (the_low_target.stopped_by_watchpoint != NULL) |
| return the_low_target.stopped_by_watchpoint (); |
| else |
| return 0; |
| } |
| |
| static CORE_ADDR |
| linux_stopped_data_address (void) |
| { |
| if (the_low_target.stopped_data_address != NULL) |
| return the_low_target.stopped_data_address (); |
| else |
| return 0; |
| } |
| |
| #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
| #if defined(__mcoldfire__) |
| /* These should really be defined in the kernel's ptrace.h header. */ |
| #define PT_TEXT_ADDR 49*4 |
| #define PT_DATA_ADDR 50*4 |
| #define PT_TEXT_END_ADDR 51*4 |
| #endif |
| |
| /* Under uClinux, programs are loaded at non-zero offsets, which we need |
| to tell gdb about. */ |
| |
| static int |
| linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) |
| { |
| #if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR) |
| unsigned long text, text_end, data; |
| int pid = get_thread_process (current_inferior)->head.id; |
| |
| errno = 0; |
| |
| text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0); |
| text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0); |
| data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0); |
| |
| if (errno == 0) |
| { |
| /* Both text and data offsets produced at compile-time (and so |
| used by gdb) are relative to the beginning of the program, |
| with the data segment immediately following the text segment. |
| However, the actual runtime layout in memory may put the data |
| somewhere else, so when we send gdb a data base-address, we |
| use the real data base address and subtract the compile-time |
| data base-address from it (which is just the length of the |
| text segment). BSS immediately follows data in both |
| cases. */ |
| *text_p = text; |
| *data_p = data - (text_end - text); |
| |
| return 1; |
| } |
| #endif |
| return 0; |
| } |
| #endif |
| |
| static int |
| linux_qxfer_osdata (const char *annex, |
| unsigned char *readbuf, unsigned const char *writebuf, |
| CORE_ADDR offset, int len) |
| { |
| /* We make the process list snapshot when the object starts to be |
| read. */ |
| static const char *buf; |
| static long len_avail = -1; |
| static struct buffer buffer; |
| |
| DIR *dirp; |
| |
| if (strcmp (annex, "processes") != 0) |
| return 0; |
| |
| if (!readbuf || writebuf) |
| return 0; |
| |
| if (offset == 0) |
| { |
| if (len_avail != -1 && len_avail != 0) |
| buffer_free (&buffer); |
| len_avail = 0; |
| buf = NULL; |
| buffer_init (&buffer); |
| buffer_grow_str (&buffer, "<osdata type=\"processes\">"); |
| |
| dirp = opendir ("/proc"); |
| if (dirp) |
| { |
| struct dirent *dp; |
| while ((dp = readdir (dirp)) != NULL) |
| { |
| struct stat statbuf; |
| char procentry[sizeof ("/proc/4294967295")]; |
| |
| if (!isdigit (dp->d_name[0]) |
| || strlen (dp->d_name) > sizeof ("4294967295") - 1) |
| continue; |
| |
| sprintf (procentry, "/proc/%s", dp->d_name); |
| if (stat (procentry, &statbuf) == 0 |
| && S_ISDIR (statbuf.st_mode)) |
| { |
| char pathname[128]; |
| FILE *f; |
| char cmd[MAXPATHLEN + 1]; |
| struct passwd *entry; |
| |
| sprintf (pathname, "/proc/%s/cmdline", dp->d_name); |
| entry = getpwuid (statbuf.st_uid); |
| |
| if ((f = fopen (pathname, "r")) != NULL) |
| { |
| size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); |
| if (len > 0) |
| { |
| int i; |
| for (i = 0; i < len; i++) |
| if (cmd[i] == '\0') |
| cmd[i] = ' '; |
| cmd[len] = '\0'; |
| |
| buffer_xml_printf ( |
| &buffer, |
| "<item>" |
| "<column name=\"pid\">%s</column>" |
| "<column name=\"user\">%s</column>" |
| "<column name=\"command\">%s</column>" |
| "</item>", |
| dp->d_name, |
| entry ? entry->pw_name : "?", |
| cmd); |
| } |
| fclose (f); |
| } |
| } |
| } |
| |
| closedir (dirp); |
| } |
| buffer_grow_str0 (&buffer, "</osdata>\n"); |
| buf = buffer_finish (&buffer); |
| len_avail = strlen (buf); |
| } |
| |
| if (offset >= len_avail) |
| { |
| /* Done. Get rid of the data. */ |
| buffer_free (&buffer); |
| buf = NULL; |
| len_avail = 0; |
| return 0; |
| } |
| |
| if (len > len_avail - offset) |
| len = len_avail - offset; |
| memcpy (readbuf, buf + offset, len); |
| |
| return len; |
| } |
| |
| static struct target_ops linux_target_ops = { |
| linux_create_inferior, |
| linux_attach, |
| linux_kill, |
| linux_detach, |
| linux_join, |
| linux_thread_alive, |
| linux_resume, |
| linux_wait, |
| linux_fetch_registers, |
| linux_store_registers, |
| linux_read_memory, |
| linux_write_memory, |
| linux_look_up_symbols, |
| linux_request_interrupt, |
| linux_read_auxv, |
| linux_insert_watchpoint, |
| linux_remove_watchpoint, |
| linux_stopped_by_watchpoint, |
| linux_stopped_data_address, |
| #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
| linux_read_offsets, |
| #else |
| NULL, |
| #endif |
| #ifdef USE_THREAD_DB |
| thread_db_get_tls_address, |
| #else |
| NULL, |
| #endif |
| NULL, |
| hostio_last_error_from_errno, |
| linux_qxfer_osdata, |
| }; |
| |
| static void |
| linux_init_signals () |
| { |
| /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads |
| to find what the cancel signal actually is. */ |
| signal (__SIGRTMIN+1, SIG_IGN); |
| } |
| |
| void |
| initialize_low (void) |
| { |
| thread_db_active = 0; |
| set_target_ops (&linux_target_ops); |
| set_breakpoint_data (the_low_target.breakpoint, |
| the_low_target.breakpoint_len); |
| linux_init_signals (); |
| linux_test_for_tracefork (); |
| #ifdef HAVE_LINUX_REGSETS |
| for (num_regsets = 0; target_regsets[num_regsets].size >= 0; num_regsets++) |
| ; |
| disabled_regsets = xmalloc (num_regsets); |
| #endif |
| } |