| /* Low-level child interface to ttrace. |
| |
| Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| 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 "defs.h" |
| |
| /* The ttrace(2) system call didn't exist before HP-UX 10.30. Don't |
| try to compile this code unless we have it. */ |
| #ifdef HAVE_TTRACE |
| |
| #include "command.h" |
| #include "gdbcore.h" |
| #include "gdbthread.h" |
| #include "inferior.h" |
| #include "terminal.h" |
| #include "target.h" |
| |
| #include "gdb_assert.h" |
| #include "gdb_string.h" |
| #include <sys/mman.h> |
| #include <sys/ttrace.h> |
| #include <signal.h> |
| |
| #include "inf-child.h" |
| #include "inf-ttrace.h" |
| |
| |
| |
| /* HP-UX uses a threading model where each user-space thread |
| corresponds to a kernel thread. These kernel threads are called |
| lwps. The ttrace(2) interface gives us almost full control over |
| the threads, which makes it very easy to support them in GDB. We |
| identify the threads by process ID and lwp ID. The ttrace(2) also |
| provides us with a thread's user ID (in the `tts_user_tid' member |
| of `ttstate_t') but we don't use that (yet) as it isn't necessary |
| to uniquely label the thread. */ |
| |
| /* Number of active lwps. */ |
| static int inf_ttrace_num_lwps; |
| |
| |
| /* On HP-UX versions that have the ttrace(2) system call, we can |
| implement "hardware" watchpoints by fiddling with the protection of |
| pages in the address space that contain the variable being watched. |
| In order to implement this, we keep a dictionary of pages for which |
| we have changed the protection. */ |
| |
| struct inf_ttrace_page |
| { |
| CORE_ADDR addr; /* Page address. */ |
| int prot; /* Protection. */ |
| int refcount; /* Reference count. */ |
| struct inf_ttrace_page *next; |
| struct inf_ttrace_page *prev; |
| }; |
| |
| struct inf_ttrace_page_dict |
| { |
| struct inf_ttrace_page buckets[128]; |
| int pagesize; /* Page size. */ |
| int count; /* Number of pages in this dictionary. */ |
| } inf_ttrace_page_dict; |
| |
| struct inf_ttrace_private_thread_info |
| { |
| int dying; |
| }; |
| |
| /* Number of lwps that are currently in a system call. */ |
| static int inf_ttrace_num_lwps_in_syscall; |
| |
| /* Flag to indicate whether we should re-enable page protections after |
| the next wait. */ |
| static int inf_ttrace_reenable_page_protections; |
| |
| /* Enable system call events for process PID. */ |
| |
| static void |
| inf_ttrace_enable_syscall_events (pid_t pid) |
| { |
| ttevent_t tte; |
| ttstate_t tts; |
| |
| gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); |
| |
| if (ttrace (TT_PROC_GET_EVENT_MASK, pid, 0, |
| (uintptr_t)&tte, sizeof tte, 0) == -1) |
| perror_with_name (("ttrace")); |
| |
| tte.tte_events |= (TTEVT_SYSCALL_ENTRY | TTEVT_SYSCALL_RETURN); |
| |
| if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, |
| (uintptr_t)&tte, sizeof tte, 0) == -1) |
| perror_with_name (("ttrace")); |
| |
| if (ttrace (TT_PROC_GET_FIRST_LWP_STATE, pid, 0, |
| (uintptr_t)&tts, sizeof tts, 0) == -1) |
| perror_with_name (("ttrace")); |
| |
| if (tts.tts_flags & TTS_INSYSCALL) |
| inf_ttrace_num_lwps_in_syscall++; |
| |
| /* FIXME: Handle multiple threads. */ |
| } |
| |
| /* Disable system call events for process PID. */ |
| |
| static void |
| inf_ttrace_disable_syscall_events (pid_t pid) |
| { |
| ttevent_t tte; |
| |
| gdb_assert (inf_ttrace_page_dict.count == 0); |
| |
| if (ttrace (TT_PROC_GET_EVENT_MASK, pid, 0, |
| (uintptr_t)&tte, sizeof tte, 0) == -1) |
| perror_with_name (("ttrace")); |
| |
| tte.tte_events &= ~(TTEVT_SYSCALL_ENTRY | TTEVT_SYSCALL_RETURN); |
| |
| if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, |
| (uintptr_t)&tte, sizeof tte, 0) == -1) |
| perror_with_name (("ttrace")); |
| |
| inf_ttrace_num_lwps_in_syscall = 0; |
| } |
| |
| /* Get information about the page at address ADDR for process PID from |
| the dictionary. */ |
| |
| static struct inf_ttrace_page * |
| inf_ttrace_get_page (pid_t pid, CORE_ADDR addr) |
| { |
| const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); |
| const int pagesize = inf_ttrace_page_dict.pagesize; |
| int bucket; |
| struct inf_ttrace_page *page; |
| |
| bucket = (addr / pagesize) % num_buckets; |
| page = &inf_ttrace_page_dict.buckets[bucket]; |
| while (page) |
| { |
| if (page->addr == addr) |
| break; |
| |
| page = page->next; |
| } |
| |
| return page; |
| } |
| |
| /* Add the page at address ADDR for process PID to the dictionary. */ |
| |
| static struct inf_ttrace_page * |
| inf_ttrace_add_page (pid_t pid, CORE_ADDR addr) |
| { |
| const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); |
| const int pagesize = inf_ttrace_page_dict.pagesize; |
| int bucket; |
| struct inf_ttrace_page *page; |
| struct inf_ttrace_page *prev = NULL; |
| |
| bucket = (addr / pagesize) % num_buckets; |
| page = &inf_ttrace_page_dict.buckets[bucket]; |
| while (page) |
| { |
| if (page->addr == addr) |
| break; |
| |
| prev = page; |
| page = page->next; |
| } |
| |
| if (!page) |
| { |
| int prot; |
| |
| if (ttrace (TT_PROC_GET_MPROTECT, pid, 0, |
| addr, 0, (uintptr_t)&prot) == -1) |
| perror_with_name (("ttrace")); |
| |
| page = XMALLOC (struct inf_ttrace_page); |
| page->addr = addr; |
| page->prot = prot; |
| page->refcount = 0; |
| page->next = NULL; |
| |
| page->prev = prev; |
| prev->next = page; |
| |
| inf_ttrace_page_dict.count++; |
| if (inf_ttrace_page_dict.count == 1) |
| inf_ttrace_enable_syscall_events (pid); |
| |
| if (inf_ttrace_num_lwps_in_syscall == 0) |
| { |
| if (ttrace (TT_PROC_SET_MPROTECT, pid, 0, |
| addr, pagesize, prot & ~PROT_WRITE) == -1) |
| perror_with_name (("ttrace")); |
| } |
| } |
| |
| return page; |
| } |
| |
| /* Insert the page at address ADDR of process PID to the dictionary. */ |
| |
| static void |
| inf_ttrace_insert_page (pid_t pid, CORE_ADDR addr) |
| { |
| struct inf_ttrace_page *page; |
| |
| page = inf_ttrace_get_page (pid, addr); |
| if (!page) |
| page = inf_ttrace_add_page (pid, addr); |
| |
| page->refcount++; |
| } |
| |
| /* Remove the page at address ADDR of process PID from the dictionary. */ |
| |
| static void |
| inf_ttrace_remove_page (pid_t pid, CORE_ADDR addr) |
| { |
| const int pagesize = inf_ttrace_page_dict.pagesize; |
| struct inf_ttrace_page *page; |
| |
| page = inf_ttrace_get_page (pid, addr); |
| page->refcount--; |
| |
| gdb_assert (page->refcount >= 0); |
| |
| if (page->refcount == 0) |
| { |
| if (inf_ttrace_num_lwps_in_syscall == 0) |
| { |
| if (ttrace (TT_PROC_SET_MPROTECT, pid, 0, |
| addr, pagesize, page->prot) == -1) |
| perror_with_name (("ttrace")); |
| } |
| |
| inf_ttrace_page_dict.count--; |
| if (inf_ttrace_page_dict.count == 0) |
| inf_ttrace_disable_syscall_events (pid); |
| |
| page->prev->next = page->next; |
| if (page->next) |
| page->next->prev = page->prev; |
| |
| xfree (page); |
| } |
| } |
| |
| /* Mask the bits in PROT from the page protections that are currently |
| in the dictionary for process PID. */ |
| |
| static void |
| inf_ttrace_mask_page_protections (pid_t pid, int prot) |
| { |
| const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); |
| const int pagesize = inf_ttrace_page_dict.pagesize; |
| int bucket; |
| |
| for (bucket = 0; bucket < num_buckets; bucket++) |
| { |
| struct inf_ttrace_page *page; |
| |
| page = inf_ttrace_page_dict.buckets[bucket].next; |
| while (page) |
| { |
| if (ttrace (TT_PROC_SET_MPROTECT, pid, 0, |
| page->addr, pagesize, page->prot & ~prot) == -1) |
| perror_with_name (("ttrace")); |
| |
| page = page->next; |
| } |
| } |
| } |
| |
| /* Write-protect the pages in the dictionary for process PID. */ |
| |
| static void |
| inf_ttrace_enable_page_protections (pid_t pid) |
| { |
| inf_ttrace_mask_page_protections (pid, PROT_WRITE); |
| } |
| |
| /* Restore the protection of the pages in the dictionary for process |
| PID. */ |
| |
| static void |
| inf_ttrace_disable_page_protections (pid_t pid) |
| { |
| inf_ttrace_mask_page_protections (pid, 0); |
| } |
| |
| /* Insert a "hardware" watchpoint for LEN bytes at address ADDR of |
| type TYPE. */ |
| |
| static int |
| inf_ttrace_insert_watchpoint (CORE_ADDR addr, int len, int type, |
| struct expression *cond) |
| { |
| const int pagesize = inf_ttrace_page_dict.pagesize; |
| pid_t pid = ptid_get_pid (inferior_ptid); |
| CORE_ADDR page_addr; |
| int num_pages; |
| int page; |
| |
| gdb_assert (type == hw_write); |
| |
| page_addr = (addr / pagesize) * pagesize; |
| num_pages = (len + pagesize - 1) / pagesize; |
| |
| for (page = 0; page < num_pages; page++, page_addr += pagesize) |
| inf_ttrace_insert_page (pid, page_addr); |
| |
| return 1; |
| } |
| |
| /* Remove a "hardware" watchpoint for LEN bytes at address ADDR of |
| type TYPE. */ |
| |
| static int |
| inf_ttrace_remove_watchpoint (CORE_ADDR addr, int len, int type, |
| struct expression *cond) |
| { |
| const int pagesize = inf_ttrace_page_dict.pagesize; |
| pid_t pid = ptid_get_pid (inferior_ptid); |
| CORE_ADDR page_addr; |
| int num_pages; |
| int page; |
| |
| gdb_assert (type == hw_write); |
| |
| page_addr = (addr / pagesize) * pagesize; |
| num_pages = (len + pagesize - 1) / pagesize; |
| |
| for (page = 0; page < num_pages; page++, page_addr += pagesize) |
| inf_ttrace_remove_page (pid, page_addr); |
| |
| return 1; |
| } |
| |
| static int |
| inf_ttrace_can_use_hw_breakpoint (int type, int len, int ot) |
| { |
| return (type == bp_hardware_watchpoint); |
| } |
| |
| static int |
| inf_ttrace_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len) |
| { |
| return 1; |
| } |
| |
| /* Return non-zero if the current inferior was (potentially) stopped |
| by hitting a "hardware" watchpoint. */ |
| |
| static int |
| inf_ttrace_stopped_by_watchpoint (void) |
| { |
| pid_t pid = ptid_get_pid (inferior_ptid); |
| lwpid_t lwpid = ptid_get_lwp (inferior_ptid); |
| ttstate_t tts; |
| |
| if (inf_ttrace_page_dict.count > 0) |
| { |
| if (ttrace (TT_LWP_GET_STATE, pid, lwpid, |
| (uintptr_t)&tts, sizeof tts, 0) == -1) |
| perror_with_name (("ttrace")); |
| |
| if (tts.tts_event == TTEVT_SIGNAL |
| && tts.tts_u.tts_signal.tts_signo == SIGBUS) |
| { |
| const int pagesize = inf_ttrace_page_dict.pagesize; |
| void *addr = tts.tts_u.tts_signal.tts_siginfo.si_addr; |
| CORE_ADDR page_addr = ((uintptr_t)addr / pagesize) * pagesize; |
| |
| if (inf_ttrace_get_page (pid, page_addr)) |
| return 1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| |
| /* When tracking a vfork(2), we cannot detach from the parent until |
| after the child has called exec(3) or has exited. If we are still |
| attached to the parent, this variable will be set to the process ID |
| of the parent. Otherwise it will be set to zero. */ |
| static pid_t inf_ttrace_vfork_ppid = -1; |
| |
| static int |
| inf_ttrace_follow_fork (struct target_ops *ops, int follow_child) |
| { |
| pid_t pid, fpid; |
| lwpid_t lwpid, flwpid; |
| ttstate_t tts; |
| struct thread_info *tp = inferior_thread (); |
| |
| gdb_assert (tp->pending_follow.kind == TARGET_WAITKIND_FORKED |
| || tp->pending_follow.kind == TARGET_WAITKIND_VFORKED); |
| |
| pid = ptid_get_pid (inferior_ptid); |
| lwpid = ptid_get_lwp (inferior_ptid); |
| |
| /* Get all important details that core GDB doesn't (and shouldn't) |
| know about. */ |
| if (ttrace (TT_LWP_GET_STATE, pid, lwpid, |
| (uintptr_t)&tts, sizeof tts, 0) == -1) |
| perror_with_name (("ttrace")); |
| |
| gdb_assert (tts.tts_event == TTEVT_FORK || tts.tts_event == TTEVT_VFORK); |
| |
| if (tts.tts_u.tts_fork.tts_isparent) |
| { |
| pid = tts.tts_pid; |
| lwpid = tts.tts_lwpid; |
| fpid = tts.tts_u.tts_fork.tts_fpid; |
| flwpid = tts.tts_u.tts_fork.tts_flwpid; |
| } |
| else |
| { |
| pid = tts.tts_u.tts_fork.tts_fpid; |
| lwpid = tts.tts_u.tts_fork.tts_flwpid; |
| fpid = tts.tts_pid; |
| flwpid = tts.tts_lwpid; |
| } |
| |
| if (follow_child) |
| { |
| struct inferior *inf; |
| struct inferior *parent_inf; |
| |
| parent_inf = find_inferior_pid (pid); |
| |
| inferior_ptid = ptid_build (fpid, flwpid, 0); |
| inf = add_inferior (fpid); |
| inf->attach_flag = parent_inf->attach_flag; |
| inf->pspace = parent_inf->pspace; |
| inf->aspace = parent_inf->aspace; |
| copy_terminal_info (inf, parent_inf); |
| detach_breakpoints (pid); |
| |
| target_terminal_ours (); |
| fprintf_unfiltered (gdb_stdlog, _("\ |
| Attaching after fork to child process %ld.\n"), (long)fpid); |
| } |
| else |
| { |
| inferior_ptid = ptid_build (pid, lwpid, 0); |
| detach_breakpoints (fpid); |
| |
| target_terminal_ours (); |
| fprintf_unfiltered (gdb_stdlog, _("\ |
| Detaching after fork from child process %ld.\n"), (long)fpid); |
| } |
| |
| if (tts.tts_event == TTEVT_VFORK) |
| { |
| gdb_assert (!tts.tts_u.tts_fork.tts_isparent); |
| |
| if (follow_child) |
| { |
| /* We can't detach from the parent yet. */ |
| inf_ttrace_vfork_ppid = pid; |
| |
| reattach_breakpoints (fpid); |
| } |
| else |
| { |
| if (ttrace (TT_PROC_DETACH, fpid, 0, 0, 0, 0) == -1) |
| perror_with_name (("ttrace")); |
| |
| /* Wait till we get the TTEVT_VFORK event in the parent. |
| This indicates that the child has called exec(3) or has |
| exited and that the parent is ready to be traced again. */ |
| if (ttrace_wait (pid, lwpid, TTRACE_WAITOK, &tts, sizeof tts) == -1) |
| perror_with_name (("ttrace_wait")); |
| gdb_assert (tts.tts_event == TTEVT_VFORK); |
| gdb_assert (tts.tts_u.tts_fork.tts_isparent); |
| |
| reattach_breakpoints (pid); |
| } |
| } |
| else |
| { |
| gdb_assert (tts.tts_u.tts_fork.tts_isparent); |
| |
| if (follow_child) |
| { |
| if (ttrace (TT_PROC_DETACH, pid, 0, 0, 0, 0) == -1) |
| perror_with_name (("ttrace")); |
| } |
| else |
| { |
| if (ttrace (TT_PROC_DETACH, fpid, 0, 0, 0, 0) == -1) |
| perror_with_name (("ttrace")); |
| } |
| } |
| |
| if (follow_child) |
| { |
| struct thread_info *ti; |
| |
| /* The child will start out single-threaded. */ |
| inf_ttrace_num_lwps = 1; |
| inf_ttrace_num_lwps_in_syscall = 0; |
| |
| /* Delete parent. */ |
| delete_thread_silent (ptid_build (pid, lwpid, 0)); |
| detach_inferior (pid); |
| |
| /* Add child thread. inferior_ptid was already set above. */ |
| ti = add_thread_silent (inferior_ptid); |
| ti->private = |
| xmalloc (sizeof (struct inf_ttrace_private_thread_info)); |
| memset (ti->private, 0, |
| sizeof (struct inf_ttrace_private_thread_info)); |
| } |
| |
| return 0; |
| } |
| |
| |
| /* File descriptors for pipes used as semaphores during initial |
| startup of an inferior. */ |
| static int inf_ttrace_pfd1[2]; |
| static int inf_ttrace_pfd2[2]; |
| |
| static void |
| do_cleanup_pfds (void *dummy) |
| { |
| close (inf_ttrace_pfd1[0]); |
| close (inf_ttrace_pfd1[1]); |
| close (inf_ttrace_pfd2[0]); |
| close (inf_ttrace_pfd2[1]); |
| } |
| |
| static void |
| inf_ttrace_prepare (void) |
| { |
| if (pipe (inf_ttrace_pfd1) == -1) |
| perror_with_name (("pipe")); |
| |
| if (pipe (inf_ttrace_pfd2) == -1) |
| { |
| close (inf_ttrace_pfd1[0]); |
| close (inf_ttrace_pfd2[0]); |
| perror_with_name (("pipe")); |
| } |
| } |
| |
| /* Prepare to be traced. */ |
| |
| static void |
| inf_ttrace_me (void) |
| { |
| struct cleanup *old_chain = make_cleanup (do_cleanup_pfds, 0); |
| char c; |
| |
| /* "Trace me, Dr. Memory!" */ |
| if (ttrace (TT_PROC_SETTRC, 0, 0, 0, TT_VERSION, 0) == -1) |
| perror_with_name (("ttrace")); |
| |
| /* Tell our parent that we are ready to be traced. */ |
| if (write (inf_ttrace_pfd1[1], &c, sizeof c) != sizeof c) |
| perror_with_name (("write")); |
| |
| /* Wait until our parent has set the initial event mask. */ |
| if (read (inf_ttrace_pfd2[0], &c, sizeof c) != sizeof c) |
| perror_with_name (("read")); |
| |
| do_cleanups (old_chain); |
| } |
| |
| /* Start tracing PID. */ |
| |
| static void |
| inf_ttrace_him (struct target_ops *ops, int pid) |
| { |
| struct cleanup *old_chain = make_cleanup (do_cleanup_pfds, 0); |
| ttevent_t tte; |
| char c; |
| |
| /* Wait until our child is ready to be traced. */ |
| if (read (inf_ttrace_pfd1[0], &c, sizeof c) != sizeof c) |
| perror_with_name (("read")); |
| |
| /* Set the initial event mask. */ |
| memset (&tte, 0, sizeof (tte)); |
| tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT | TTEVT_FORK | TTEVT_VFORK; |
| tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE; |
| #ifdef TTEVT_BPT_SSTEP |
| tte.tte_events |= TTEVT_BPT_SSTEP; |
| #endif |
| tte.tte_opts |= TTEO_PROC_INHERIT; |
| if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, |
| (uintptr_t)&tte, sizeof tte, 0) == -1) |
| perror_with_name (("ttrace")); |
| |
| /* Tell our child that we have set the initial event mask. */ |
| if (write (inf_ttrace_pfd2[1], &c, sizeof c) != sizeof c) |
| perror_with_name (("write")); |
| |
| do_cleanups (old_chain); |
| |
| push_target (ops); |
| |
| /* On some targets, there must be some explicit synchronization |
| between the parent and child processes after the debugger forks, |
| and before the child execs the debuggee program. This call |
| basically gives permission for the child to exec. */ |
| |
| target_acknowledge_created_inferior (pid); |
| |
| /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h, and will |
| be 1 or 2 depending on whether we're starting without or with a |
| shell. */ |
| startup_inferior (START_INFERIOR_TRAPS_EXPECTED); |
| |
| /* On some targets, there must be some explicit actions taken after |
| the inferior has been started up. */ |
| target_post_startup_inferior (pid_to_ptid (pid)); |
| } |
| |
| static void |
| inf_ttrace_create_inferior (struct target_ops *ops, char *exec_file, |
| char *allargs, char **env, int from_tty) |
| { |
| int pid; |
| |
| gdb_assert (inf_ttrace_num_lwps == 0); |
| gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); |
| gdb_assert (inf_ttrace_page_dict.count == 0); |
| gdb_assert (inf_ttrace_reenable_page_protections == 0); |
| gdb_assert (inf_ttrace_vfork_ppid == -1); |
| |
| pid = fork_inferior (exec_file, allargs, env, inf_ttrace_me, NULL, |
| inf_ttrace_prepare, NULL); |
| |
| inf_ttrace_him (ops, pid); |
| } |
| |
| static void |
| inf_ttrace_mourn_inferior (struct target_ops *ops) |
| { |
| const int num_buckets = ARRAY_SIZE (inf_ttrace_page_dict.buckets); |
| int bucket; |
| |
| inf_ttrace_num_lwps = 0; |
| inf_ttrace_num_lwps_in_syscall = 0; |
| |
| for (bucket = 0; bucket < num_buckets; bucket++) |
| { |
| struct inf_ttrace_page *page; |
| struct inf_ttrace_page *next; |
| |
| page = inf_ttrace_page_dict.buckets[bucket].next; |
| while (page) |
| { |
| next = page->next; |
| xfree (page); |
| page = next; |
| } |
| } |
| inf_ttrace_page_dict.count = 0; |
| |
| unpush_target (ops); |
| generic_mourn_inferior (); |
| } |
| |
| static void |
| inf_ttrace_attach (struct target_ops *ops, char *args, int from_tty) |
| { |
| char *exec_file; |
| pid_t pid; |
| ttevent_t tte; |
| struct inferior *inf; |
| |
| pid = parse_pid_to_attach (args); |
| |
| if (pid == getpid ()) /* Trying to masturbate? */ |
| error (_("I refuse to debug myself!")); |
| |
| if (from_tty) |
| { |
| exec_file = get_exec_file (0); |
| |
| if (exec_file) |
| printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
| target_pid_to_str (pid_to_ptid (pid))); |
| else |
| printf_unfiltered (_("Attaching to %s\n"), |
| target_pid_to_str (pid_to_ptid (pid))); |
| |
| gdb_flush (gdb_stdout); |
| } |
| |
| gdb_assert (inf_ttrace_num_lwps == 0); |
| gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); |
| gdb_assert (inf_ttrace_vfork_ppid == -1); |
| |
| if (ttrace (TT_PROC_ATTACH, pid, 0, TT_KILL_ON_EXIT, TT_VERSION, 0) == -1) |
| perror_with_name (("ttrace")); |
| |
| inf = current_inferior (); |
| inferior_appeared (inf, pid); |
| inf->attach_flag = 1; |
| |
| /* Set the initial event mask. */ |
| memset (&tte, 0, sizeof (tte)); |
| tte.tte_events |= TTEVT_EXEC | TTEVT_EXIT | TTEVT_FORK | TTEVT_VFORK; |
| tte.tte_events |= TTEVT_LWP_CREATE | TTEVT_LWP_EXIT | TTEVT_LWP_TERMINATE; |
| #ifdef TTEVT_BPT_SSTEP |
| tte.tte_events |= TTEVT_BPT_SSTEP; |
| #endif |
| tte.tte_opts |= TTEO_PROC_INHERIT; |
| if (ttrace (TT_PROC_SET_EVENT_MASK, pid, 0, |
| (uintptr_t)&tte, sizeof tte, 0) == -1) |
| perror_with_name (("ttrace")); |
| |
| push_target (ops); |
| |
| /* We'll bump inf_ttrace_num_lwps up and add the private data to the |
| thread as soon as we get to inf_ttrace_wait. At this point, we |
| don't have lwpid info yet. */ |
| inferior_ptid = pid_to_ptid (pid); |
| add_thread_silent (inferior_ptid); |
| } |
| |
| static void |
| inf_ttrace_detach (struct target_ops *ops, char *args, int from_tty) |
| { |
| pid_t pid = ptid_get_pid (inferior_ptid); |
| int sig = 0; |
| |
| if (from_tty) |
| { |
| char *exec_file = get_exec_file (0); |
| if (exec_file == 0) |
| exec_file = ""; |
| printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file, |
| target_pid_to_str (pid_to_ptid (pid))); |
| gdb_flush (gdb_stdout); |
| } |
| if (args) |
| sig = atoi (args); |
| |
| /* ??? The HP-UX 11.0 ttrace(2) manual page doesn't mention that we |
| can pass a signal number here. Does this really work? */ |
| if (ttrace (TT_PROC_DETACH, pid, 0, 0, sig, 0) == -1) |
| perror_with_name (("ttrace")); |
| |
| if (inf_ttrace_vfork_ppid != -1) |
| { |
| if (ttrace (TT_PROC_DETACH, inf_ttrace_vfork_ppid, 0, 0, 0, 0) == -1) |
| perror_with_name (("ttrace")); |
| inf_ttrace_vfork_ppid = -1; |
| } |
| |
| inf_ttrace_num_lwps = 0; |
| inf_ttrace_num_lwps_in_syscall = 0; |
| |
| inferior_ptid = null_ptid; |
| detach_inferior (pid); |
| |
| unpush_target (ops); |
| } |
| |
| static void |
| inf_ttrace_kill (struct target_ops *ops) |
| { |
| pid_t pid = ptid_get_pid (inferior_ptid); |
| |
| if (pid == 0) |
| return; |
| |
| if (ttrace (TT_PROC_EXIT, pid, 0, 0, 0, 0) == -1) |
| perror_with_name (("ttrace")); |
| /* ??? Is it necessary to call ttrace_wait() here? */ |
| |
| if (inf_ttrace_vfork_ppid != -1) |
| { |
| if (ttrace (TT_PROC_DETACH, inf_ttrace_vfork_ppid, 0, 0, 0, 0) == -1) |
| perror_with_name (("ttrace")); |
| inf_ttrace_vfork_ppid = -1; |
| } |
| |
| target_mourn_inferior (); |
| } |
| |
| /* Check is a dying thread is dead by now, and delete it from GDBs |
| thread list if so. */ |
| static int |
| inf_ttrace_delete_dead_threads_callback (struct thread_info *info, void *arg) |
| { |
| lwpid_t lwpid; |
| struct inf_ttrace_private_thread_info *p; |
| |
| if (is_exited (info->ptid)) |
| return 0; |
| |
| lwpid = ptid_get_lwp (info->ptid); |
| p = (struct inf_ttrace_private_thread_info *) info->private; |
| |
| /* Check if an lwp that was dying is still there or not. */ |
| if (p->dying && (kill (lwpid, 0) == -1)) |
| /* It's gone now. */ |
| delete_thread (info->ptid); |
| |
| return 0; |
| } |
| |
| /* Resume the lwp pointed to by INFO, with REQUEST, and pass it signal |
| SIG. */ |
| |
| static void |
| inf_ttrace_resume_lwp (struct thread_info *info, ttreq_t request, int sig) |
| { |
| pid_t pid = ptid_get_pid (info->ptid); |
| lwpid_t lwpid = ptid_get_lwp (info->ptid); |
| |
| if (ttrace (request, pid, lwpid, TT_NOPC, sig, 0) == -1) |
| { |
| struct inf_ttrace_private_thread_info *p |
| = (struct inf_ttrace_private_thread_info *) info->private; |
| if (p->dying && errno == EPROTO) |
| /* This is expected, it means the dying lwp is really gone |
| by now. If ttrace had an event to inform the debugger |
| the lwp is really gone, this wouldn't be needed. */ |
| delete_thread (info->ptid); |
| else |
| /* This was really unexpected. */ |
| perror_with_name (("ttrace")); |
| } |
| } |
| |
| /* Callback for iterate_over_threads. */ |
| |
| static int |
| inf_ttrace_resume_callback (struct thread_info *info, void *arg) |
| { |
| if (!ptid_equal (info->ptid, inferior_ptid) && !is_exited (info->ptid)) |
| inf_ttrace_resume_lwp (info, TT_LWP_CONTINUE, 0); |
| |
| return 0; |
| } |
| |
| static void |
| inf_ttrace_resume (struct target_ops *ops, |
| ptid_t ptid, int step, enum target_signal signal) |
| { |
| int resume_all; |
| ttreq_t request = step ? TT_LWP_SINGLE : TT_LWP_CONTINUE; |
| int sig = target_signal_to_host (signal); |
| struct thread_info *info; |
| |
| /* A specific PTID means `step only this process id'. */ |
| resume_all = (ptid_equal (ptid, minus_one_ptid)); |
| |
| /* If resuming all threads, it's the current thread that should be |
| handled specially. */ |
| if (resume_all) |
| ptid = inferior_ptid; |
| |
| info = find_thread_ptid (ptid); |
| inf_ttrace_resume_lwp (info, request, sig); |
| |
| if (resume_all) |
| /* Let all the other threads run too. */ |
| iterate_over_threads (inf_ttrace_resume_callback, NULL); |
| } |
| |
| static ptid_t |
| inf_ttrace_wait (struct target_ops *ops, |
| ptid_t ptid, struct target_waitstatus *ourstatus, int options) |
| { |
| pid_t pid = ptid_get_pid (ptid); |
| lwpid_t lwpid = ptid_get_lwp (ptid); |
| ttstate_t tts; |
| struct thread_info *ti; |
| ptid_t related_ptid; |
| |
| /* Until proven otherwise. */ |
| ourstatus->kind = TARGET_WAITKIND_SPURIOUS; |
| |
| if (pid == -1) |
| pid = lwpid = 0; |
| |
| gdb_assert (pid != 0 || lwpid == 0); |
| |
| do |
| { |
| set_sigint_trap (); |
| |
| if (ttrace_wait (pid, lwpid, TTRACE_WAITOK, &tts, sizeof tts) == -1) |
| perror_with_name (("ttrace_wait")); |
| |
| if (tts.tts_event == TTEVT_VFORK && tts.tts_u.tts_fork.tts_isparent) |
| { |
| if (inf_ttrace_vfork_ppid != -1) |
| { |
| gdb_assert (inf_ttrace_vfork_ppid == tts.tts_pid); |
| |
| if (ttrace (TT_PROC_DETACH, tts.tts_pid, 0, 0, 0, 0) == -1) |
| perror_with_name (("ttrace")); |
| inf_ttrace_vfork_ppid = -1; |
| } |
| |
| tts.tts_event = TTEVT_NONE; |
| } |
| |
| clear_sigint_trap (); |
| } |
| while (tts.tts_event == TTEVT_NONE); |
| |
| /* Now that we've waited, we can re-enable the page protections. */ |
| if (inf_ttrace_reenable_page_protections) |
| { |
| gdb_assert (inf_ttrace_num_lwps_in_syscall == 0); |
| inf_ttrace_enable_page_protections (tts.tts_pid); |
| inf_ttrace_reenable_page_protections = 0; |
| } |
| |
| ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); |
| |
| if (inf_ttrace_num_lwps == 0) |
| { |
| struct thread_info *ti; |
| |
| inf_ttrace_num_lwps = 1; |
| |
| /* This is the earliest we hear about the lwp member of |
| INFERIOR_PTID, after an attach or fork_inferior. */ |
| gdb_assert (ptid_get_lwp (inferior_ptid) == 0); |
| |
| /* We haven't set the private member on the main thread yet. Do |
| it now. */ |
| ti = find_thread_ptid (inferior_ptid); |
| gdb_assert (ti != NULL && ti->private == NULL); |
| ti->private = |
| xmalloc (sizeof (struct inf_ttrace_private_thread_info)); |
| memset (ti->private, 0, |
| sizeof (struct inf_ttrace_private_thread_info)); |
| |
| /* Notify the core that this ptid changed. This changes |
| inferior_ptid as well. */ |
| thread_change_ptid (inferior_ptid, ptid); |
| } |
| |
| switch (tts.tts_event) |
| { |
| #ifdef TTEVT_BPT_SSTEP |
| case TTEVT_BPT_SSTEP: |
| /* Make it look like a breakpoint. */ |
| ourstatus->kind = TARGET_WAITKIND_STOPPED; |
| ourstatus->value.sig = TARGET_SIGNAL_TRAP; |
| break; |
| #endif |
| |
| case TTEVT_EXEC: |
| ourstatus->kind = TARGET_WAITKIND_EXECD; |
| ourstatus->value.execd_pathname = |
| xmalloc (tts.tts_u.tts_exec.tts_pathlen + 1); |
| if (ttrace (TT_PROC_GET_PATHNAME, tts.tts_pid, 0, |
| (uintptr_t)ourstatus->value.execd_pathname, |
| tts.tts_u.tts_exec.tts_pathlen, 0) == -1) |
| perror_with_name (("ttrace")); |
| ourstatus->value.execd_pathname[tts.tts_u.tts_exec.tts_pathlen] = 0; |
| |
| /* At this point, all inserted breakpoints are gone. Doing this |
| as soon as we detect an exec prevents the badness of deleting |
| a breakpoint writing the current "shadow contents" to lift |
| the bp. That shadow is NOT valid after an exec. */ |
| mark_breakpoints_out (); |
| break; |
| |
| case TTEVT_EXIT: |
| store_waitstatus (ourstatus, tts.tts_u.tts_exit.tts_exitcode); |
| inf_ttrace_num_lwps = 0; |
| break; |
| |
| case TTEVT_FORK: |
| related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid, |
| tts.tts_u.tts_fork.tts_flwpid, 0); |
| |
| ourstatus->kind = TARGET_WAITKIND_FORKED; |
| ourstatus->value.related_pid = related_ptid; |
| |
| /* Make sure the other end of the fork is stopped too. */ |
| if (ttrace_wait (tts.tts_u.tts_fork.tts_fpid, |
| tts.tts_u.tts_fork.tts_flwpid, |
| TTRACE_WAITOK, &tts, sizeof tts) == -1) |
| perror_with_name (("ttrace_wait")); |
| |
| gdb_assert (tts.tts_event == TTEVT_FORK); |
| if (tts.tts_u.tts_fork.tts_isparent) |
| { |
| related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid, |
| tts.tts_u.tts_fork.tts_flwpid, 0); |
| ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); |
| ourstatus->value.related_pid = related_ptid; |
| } |
| break; |
| |
| case TTEVT_VFORK: |
| gdb_assert (!tts.tts_u.tts_fork.tts_isparent); |
| |
| related_ptid = ptid_build (tts.tts_u.tts_fork.tts_fpid, |
| tts.tts_u.tts_fork.tts_flwpid, 0); |
| |
| ourstatus->kind = TARGET_WAITKIND_VFORKED; |
| ourstatus->value.related_pid = related_ptid; |
| |
| /* HACK: To avoid touching the parent during the vfork, switch |
| away from it. */ |
| inferior_ptid = ptid; |
| break; |
| |
| case TTEVT_LWP_CREATE: |
| lwpid = tts.tts_u.tts_thread.tts_target_lwpid; |
| ptid = ptid_build (tts.tts_pid, lwpid, 0); |
| ti = add_thread (ptid); |
| ti->private = |
| xmalloc (sizeof (struct inf_ttrace_private_thread_info)); |
| memset (ti->private, 0, |
| sizeof (struct inf_ttrace_private_thread_info)); |
| inf_ttrace_num_lwps++; |
| ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); |
| /* Let the lwp_create-caller thread continue. */ |
| ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid), |
| ptid_get_lwp (ptid), TT_NOPC, 0, 0); |
| /* Return without stopping the whole process. */ |
| ourstatus->kind = TARGET_WAITKIND_IGNORE; |
| return ptid; |
| |
| case TTEVT_LWP_EXIT: |
| if (print_thread_events) |
| printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (ptid)); |
| ti = find_thread_ptid (ptid); |
| gdb_assert (ti != NULL); |
| ((struct inf_ttrace_private_thread_info *)ti->private)->dying = 1; |
| inf_ttrace_num_lwps--; |
| /* Let the thread really exit. */ |
| ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid), |
| ptid_get_lwp (ptid), TT_NOPC, 0, 0); |
| /* Return without stopping the whole process. */ |
| ourstatus->kind = TARGET_WAITKIND_IGNORE; |
| return ptid; |
| |
| case TTEVT_LWP_TERMINATE: |
| lwpid = tts.tts_u.tts_thread.tts_target_lwpid; |
| ptid = ptid_build (tts.tts_pid, lwpid, 0); |
| if (print_thread_events) |
| printf_unfiltered(_("[%s has been terminated]\n"), |
| target_pid_to_str (ptid)); |
| ti = find_thread_ptid (ptid); |
| gdb_assert (ti != NULL); |
| ((struct inf_ttrace_private_thread_info *)ti->private)->dying = 1; |
| inf_ttrace_num_lwps--; |
| |
| /* Resume the lwp_terminate-caller thread. */ |
| ptid = ptid_build (tts.tts_pid, tts.tts_lwpid, 0); |
| ttrace (TT_LWP_CONTINUE, ptid_get_pid (ptid), |
| ptid_get_lwp (ptid), TT_NOPC, 0, 0); |
| /* Return without stopping the whole process. */ |
| ourstatus->kind = TARGET_WAITKIND_IGNORE; |
| return ptid; |
| |
| case TTEVT_SIGNAL: |
| ourstatus->kind = TARGET_WAITKIND_STOPPED; |
| ourstatus->value.sig = |
| target_signal_from_host (tts.tts_u.tts_signal.tts_signo); |
| break; |
| |
| case TTEVT_SYSCALL_ENTRY: |
| gdb_assert (inf_ttrace_reenable_page_protections == 0); |
| inf_ttrace_num_lwps_in_syscall++; |
| if (inf_ttrace_num_lwps_in_syscall == 1) |
| { |
| /* A thread has just entered a system call. Disable any |
| page protections as the kernel can't deal with them. */ |
| inf_ttrace_disable_page_protections (tts.tts_pid); |
| } |
| ourstatus->kind = TARGET_WAITKIND_SYSCALL_ENTRY; |
| ourstatus->value.syscall_number = tts.tts_scno; |
| break; |
| |
| case TTEVT_SYSCALL_RETURN: |
| if (inf_ttrace_num_lwps_in_syscall > 0) |
| { |
| /* If the last thread has just left the system call, this |
| would be a logical place to re-enable the page |
| protections, but that doesn't work. We can't re-enable |
| them until we've done another wait. */ |
| inf_ttrace_reenable_page_protections = |
| (inf_ttrace_num_lwps_in_syscall == 1); |
| inf_ttrace_num_lwps_in_syscall--; |
| } |
| ourstatus->kind = TARGET_WAITKIND_SYSCALL_RETURN; |
| ourstatus->value.syscall_number = tts.tts_scno; |
| break; |
| |
| default: |
| gdb_assert (!"Unexpected ttrace event"); |
| break; |
| } |
| |
| /* Make sure all threads within the process are stopped. */ |
| if (ttrace (TT_PROC_STOP, tts.tts_pid, 0, 0, 0, 0) == -1) |
| perror_with_name (("ttrace")); |
| |
| /* Now that the whole process is stopped, check if any dying thread |
| is really dead by now. If a dying thread is still alive, it will |
| be stopped too, and will still show up in `info threads', tagged |
| with "(Exiting)". We could make `info threads' prune dead |
| threads instead via inf_ttrace_thread_alive, but doing this here |
| has the advantage that a frontend is notificed sooner of thread |
| exits. Note that a dying lwp is still alive, it still has to be |
| resumed, like any other lwp. */ |
| iterate_over_threads (inf_ttrace_delete_dead_threads_callback, NULL); |
| |
| return ptid; |
| } |
| |
| /* Transfer LEN bytes from ADDR in the inferior's memory into READBUF, |
| and transfer LEN bytes from WRITEBUF into the inferior's memory at |
| ADDR. Either READBUF or WRITEBUF may be null, in which case the |
| corresponding transfer doesn't happen. Return the number of bytes |
| actually transferred (which may be zero if an error occurs). */ |
| |
| static LONGEST |
| inf_ttrace_xfer_memory (CORE_ADDR addr, ULONGEST len, |
| void *readbuf, const void *writebuf) |
| { |
| pid_t pid = ptid_get_pid (inferior_ptid); |
| |
| /* HP-UX treats text space and data space differently. GDB however, |
| doesn't really know the difference. Therefore we try both. Try |
| text space before data space though because when we're writing |
| into text space the instruction cache might need to be flushed. */ |
| |
| if (readbuf |
| && ttrace (TT_PROC_RDTEXT, pid, 0, addr, len, (uintptr_t)readbuf) == -1 |
| && ttrace (TT_PROC_RDDATA, pid, 0, addr, len, (uintptr_t)readbuf) == -1) |
| return 0; |
| |
| if (writebuf |
| && ttrace (TT_PROC_WRTEXT, pid, 0, addr, len, (uintptr_t)writebuf) == -1 |
| && ttrace (TT_PROC_WRDATA, pid, 0, addr, len, (uintptr_t)writebuf) == -1) |
| return 0; |
| |
| return len; |
| } |
| |
| static LONGEST |
| inf_ttrace_xfer_partial (struct target_ops *ops, enum target_object object, |
| const char *annex, gdb_byte *readbuf, |
| const gdb_byte *writebuf, ULONGEST offset, LONGEST len) |
| { |
| switch (object) |
| { |
| case TARGET_OBJECT_MEMORY: |
| return inf_ttrace_xfer_memory (offset, len, readbuf, writebuf); |
| |
| case TARGET_OBJECT_UNWIND_TABLE: |
| return -1; |
| |
| case TARGET_OBJECT_AUXV: |
| return -1; |
| |
| case TARGET_OBJECT_WCOOKIE: |
| return -1; |
| |
| default: |
| return -1; |
| } |
| } |
| |
| /* Print status information about what we're accessing. */ |
| |
| static void |
| inf_ttrace_files_info (struct target_ops *ignore) |
| { |
| struct inferior *inf = current_inferior (); |
| printf_filtered (_("\tUsing the running image of %s %s.\n"), |
| inf->attach_flag ? "attached" : "child", |
| target_pid_to_str (inferior_ptid)); |
| } |
| |
| static int |
| inf_ttrace_thread_alive (struct target_ops *ops, ptid_t ptid) |
| { |
| return 1; |
| } |
| |
| /* Return a string describing the state of the thread specified by |
| INFO. */ |
| |
| static char * |
| inf_ttrace_extra_thread_info (struct thread_info *info) |
| { |
| struct inf_ttrace_private_thread_info* private = |
| (struct inf_ttrace_private_thread_info *) info->private; |
| |
| if (private != NULL && private->dying) |
| return "Exiting"; |
| |
| return NULL; |
| } |
| |
| static char * |
| inf_ttrace_pid_to_str (struct target_ops *ops, ptid_t ptid) |
| { |
| pid_t pid = ptid_get_pid (ptid); |
| lwpid_t lwpid = ptid_get_lwp (ptid); |
| static char buf[128]; |
| |
| if (lwpid == 0) |
| xsnprintf (buf, sizeof buf, "process %ld", |
| (long) pid); |
| else |
| xsnprintf (buf, sizeof buf, "process %ld, lwp %ld", |
| (long) pid, (long) lwpid); |
| return buf; |
| } |
| |
| |
| /* Implement the get_ada_task_ptid target_ops method. */ |
| |
| static ptid_t |
| inf_ttrace_get_ada_task_ptid (long lwp, long thread) |
| { |
| return ptid_build (ptid_get_pid (inferior_ptid), lwp, 0); |
| } |
| |
| |
| struct target_ops * |
| inf_ttrace_target (void) |
| { |
| struct target_ops *t = inf_child_target (); |
| |
| t->to_attach = inf_ttrace_attach; |
| t->to_detach = inf_ttrace_detach; |
| t->to_resume = inf_ttrace_resume; |
| t->to_wait = inf_ttrace_wait; |
| t->to_files_info = inf_ttrace_files_info; |
| t->to_can_use_hw_breakpoint = inf_ttrace_can_use_hw_breakpoint; |
| t->to_insert_watchpoint = inf_ttrace_insert_watchpoint; |
| t->to_remove_watchpoint = inf_ttrace_remove_watchpoint; |
| t->to_stopped_by_watchpoint = inf_ttrace_stopped_by_watchpoint; |
| t->to_region_ok_for_hw_watchpoint = |
| inf_ttrace_region_ok_for_hw_watchpoint; |
| t->to_kill = inf_ttrace_kill; |
| t->to_create_inferior = inf_ttrace_create_inferior; |
| t->to_follow_fork = inf_ttrace_follow_fork; |
| t->to_mourn_inferior = inf_ttrace_mourn_inferior; |
| t->to_thread_alive = inf_ttrace_thread_alive; |
| t->to_extra_thread_info = inf_ttrace_extra_thread_info; |
| t->to_pid_to_str = inf_ttrace_pid_to_str; |
| t->to_xfer_partial = inf_ttrace_xfer_partial; |
| t->to_get_ada_task_ptid = inf_ttrace_get_ada_task_ptid; |
| |
| return t; |
| } |
| #endif |
| |
| |
| /* Prevent warning from -Wmissing-prototypes. */ |
| void _initialize_hppa_hpux_nat (void); |
| |
| void |
| _initialize_inf_ttrace (void) |
| { |
| #ifdef HAVE_TTRACE |
| inf_ttrace_page_dict.pagesize = getpagesize(); |
| #endif |
| } |