/* $FreeBSD: /tmp/pcvs/ports/devel/gdb/files/fbsd-threads.c,v 1.1 2010-11-16 20:39:48 skreuzer Exp $ */ /* FreeBSD libthread_db assisted debugging support. Copyright 1999, 2000, 2001 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 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include #include #include #include #include "proc_service.h" #include "thread_db.h" #include "defs.h" #include "bfd.h" #include "elf-bfd.h" #include "gdb_assert.h" #include "gdbcore.h" #include "gdbthread.h" #include "inferior.h" #include "objfiles.h" #include "regcache.h" #include "symfile.h" #include "symtab.h" #include "target.h" #include "observer.h" #include "gdbcmd.h" #include "gregset.h" #ifdef PT_GETXMMREGS #include "i387-tdep.h" #endif #define LIBTHREAD_DB_SO "libthread_db.so" struct ps_prochandle { pid_t pid; }; /* This module's target vectors. */ static struct target_ops fbsd_thread_ops; /* Non-zero if there is a thread module */ static int fbsd_thread_present; /* Non-zero if we're using this module's target vector. */ static int fbsd_thread_active; /* Non-zero if we have to keep this module's target vector active across re-runs. */ static int keep_thread_db; /* Structure that identifies the child process for the interface. */ static struct ps_prochandle proc_handle; /* Connection to the libthread_db library. */ static td_thragent_t *thread_agent; /* The last thread we are single stepping */ static ptid_t last_single_step_thread; /* Pointers to the libthread_db functions. */ static td_err_e (*td_init_p) (void); static td_err_e (*td_ta_new_p) (struct ps_prochandle *ps, td_thragent_t **ta); static td_err_e (*td_ta_delete_p) (td_thragent_t *); static td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt, td_thrhandle_t *__th); static td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, lwpid_t lwpid, td_thrhandle_t *th); static td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, td_thr_iter_f *callback, void *cbdata_p, td_thr_state_e state, int ti_pri, sigset_t *ti_sigmask_p, unsigned int ti_user_flags); static td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, td_event_e event, td_notify_t *ptr); static td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, td_thr_events_t *event); static td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, td_event_msg_t *msg); static td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, td_thrinfo_t *infop); #ifdef PT_GETXMMREGS static td_err_e (*td_thr_getxmmregs_p) (const td_thrhandle_t *th, char *regset); #endif static td_err_e (*td_thr_getfpregs_p) (const td_thrhandle_t *th, prfpregset_t *regset); static td_err_e (*td_thr_getgregs_p) (const td_thrhandle_t *th, prgregset_t gregs); #ifdef PT_GETXMMREGS static td_err_e (*td_thr_setxmmregs_p) (const td_thrhandle_t *th, const char *fpregs); #endif static td_err_e (*td_thr_setfpregs_p) (const td_thrhandle_t *th, const prfpregset_t *fpregs); static td_err_e (*td_thr_setgregs_p) (const td_thrhandle_t *th, prgregset_t gregs); static td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, int event); static td_err_e (*td_thr_sstep_p) (td_thrhandle_t *th, int step); static td_err_e (*td_ta_tsd_iter_p) (const td_thragent_t *ta, td_key_iter_f *func, void *data); static td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, void *map_address, size_t offset, void **address); static td_err_e (*td_thr_dbsuspend_p) (const td_thrhandle_t *); static td_err_e (*td_thr_dbresume_p) (const td_thrhandle_t *); static CORE_ADDR td_create_bp_addr; /* Location of the thread death event breakpoint. */ static CORE_ADDR td_death_bp_addr; /* Prototypes for local functions. */ static void fbsd_thread_find_new_threads (struct target_ops *ops); static int fbsd_thread_alive (struct target_ops *ops, ptid_t ptid); static void attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, const td_thrinfo_t *ti_p, int verbose); static void fbsd_thread_detach (struct target_ops *ops, char *args, int from_tty); /* Building process ids. */ #define GET_PID(ptid) ptid_get_pid (ptid) #define GET_LWP(ptid) ptid_get_lwp (ptid) #define GET_THREAD(ptid) ptid_get_tid (ptid) #define IS_LWP(ptid) (GET_LWP (ptid) != 0) #define IS_THREAD(ptid) (GET_THREAD (ptid) != 0) #define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0) #define BUILD_THREAD(tid, pid) ptid_build (pid, 0, tid) static char * thread_db_err_str (td_err_e err) { static char buf[64]; switch (err) { case TD_OK: return "generic 'call succeeded'"; case TD_ERR: return "generic error"; case TD_NOTHR: return "no thread to satisfy query"; case TD_NOSV: return "no sync handle to satisfy query"; case TD_NOLWP: return "no LWP to satisfy query"; case TD_BADPH: return "invalid process handle"; case TD_BADTH: return "invalid thread handle"; case TD_BADSH: return "invalid synchronization handle"; case TD_BADTA: return "invalid thread agent"; case TD_BADKEY: return "invalid key"; case TD_NOMSG: return "no event message for getmsg"; case TD_NOFPREGS: return "FPU register set not available"; case TD_NOLIBTHREAD: return "application not linked with libthread"; case TD_NOEVENT: return "requested event is not supported"; case TD_NOCAPAB: return "capability not available"; case TD_DBERR: return "debugger service failed"; case TD_NOAPLIC: return "operation not applicable to"; case TD_NOTSD: return "no thread-specific data for this thread"; case TD_MALLOC: return "malloc failed"; case TD_PARTIALREG: return "only part of register set was written/read"; case TD_NOXREGS: return "X register set not available for this thread"; default: snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); return buf; } } static char * thread_db_state_str (td_thr_state_e state) { static char buf[64]; switch (state) { case TD_THR_STOPPED: return "stopped by debugger"; case TD_THR_RUN: return "runnable"; case TD_THR_ACTIVE: return "active"; case TD_THR_ZOMBIE: return "zombie"; case TD_THR_SLEEP: return "sleeping"; case TD_THR_STOPPED_ASLEEP: return "stopped by debugger AND blocked"; default: snprintf (buf, sizeof (buf), "unknown thread_db state %d", state); return buf; } } /* Convert LWP to user-level thread id. */ static ptid_t thread_from_lwp (ptid_t ptid, td_thrhandle_t *th, td_thrinfo_t *ti) { td_err_e err; gdb_assert (IS_LWP (ptid)); if (fbsd_thread_active) { err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (ptid), th); if (err == TD_OK) { err = td_thr_get_info_p (th, ti); if (err != TD_OK) error ("Cannot get thread info: %s", thread_db_err_str (err)); return BUILD_THREAD (ti->ti_tid, GET_PID (ptid)); } } /* the LWP is not mapped to user thread */ return BUILD_LWP (GET_LWP (ptid), GET_PID (ptid)); } static void fbsd_core_get_first_lwp (bfd *abfd, asection *asect, void *obj) { if (strncmp (bfd_section_name (abfd, asect), ".reg/", 5) != 0) return; if (*(lwpid_t *)obj != 0) return; *(lwpid_t *)obj = atoi (bfd_section_name (abfd, asect) + 5); } static long get_current_lwp (int pid) { struct ptrace_lwpinfo pl; lwpid_t lwpid; if (!target_has_execution) { lwpid = 0; bfd_map_over_sections (core_bfd, fbsd_core_get_first_lwp, &lwpid); return lwpid; } if (ptrace (PT_LWPINFO, pid, (caddr_t)&pl, sizeof(pl))) perror_with_name("PT_LWPINFO"); return (long)pl.pl_lwpid; } static void get_current_thread () { td_thrhandle_t th; td_thrinfo_t ti; long lwp; ptid_t tmp, ptid; lwp = get_current_lwp (proc_handle.pid); tmp = BUILD_LWP (lwp, proc_handle.pid); ptid = thread_from_lwp (tmp, &th, &ti); if (!in_thread_list (ptid)) { attach_thread (ptid, &th, &ti, 1); } inferior_ptid = ptid; } static CORE_ADDR extract_func_ptr(void *value) { return (extract_typed_address ((gdb_byte *)value, builtin_type (target_gdbarch)->builtin_func_ptr)); } static CORE_ADDR extract_data_ptr(void *value) { return (extract_typed_address ((gdb_byte *)value, builtin_type (target_gdbarch)->builtin_data_ptr)); } static td_err_e enable_thread_event (td_thragent_t *thread_agent, int event, CORE_ADDR *bp) { td_notify_t notify; td_err_e err; /* Get the breakpoint address for thread EVENT. */ err = td_ta_event_addr_p (thread_agent, event, ¬ify); if (err != TD_OK) return err; /* Set up the breakpoint. */ (*bp) = (gdbarch_convert_from_func_ptr_addr (target_gdbarch, extract_func_ptr(¬ify.u.bptaddr), ¤t_target)); create_thread_event_breakpoint (target_gdbarch, (*bp)); return TD_OK; } static void enable_thread_event_reporting (void) { td_thr_events_t events; td_notify_t notify; td_err_e err; /* We cannot use the thread event reporting facility if these functions aren't available. */ if (td_ta_event_addr_p == NULL || td_ta_set_event_p == NULL || td_ta_event_getmsg_p == NULL || td_thr_event_enable_p == NULL) return; /* Set the process wide mask saying which events we're interested in. */ td_event_emptyset (&events); td_event_addset (&events, TD_CREATE); td_event_addset (&events, TD_DEATH); err = td_ta_set_event_p (thread_agent, &events); if (err != TD_OK) { warning ("Unable to set global thread event mask: %s", thread_db_err_str (err)); return; } /* Delete previous thread event breakpoints, if any. */ remove_thread_event_breakpoints (); td_create_bp_addr = 0; td_death_bp_addr = 0; /* Set up the thread creation event. */ err = enable_thread_event (thread_agent, TD_CREATE, &td_create_bp_addr); if (err != TD_OK) { warning ("Unable to get location for thread creation breakpoint: %s", thread_db_err_str (err)); return; } /* Set up the thread death event. */ err = enable_thread_event (thread_agent, TD_DEATH, &td_death_bp_addr); if (err != TD_OK) { warning ("Unable to get location for thread death breakpoint: %s", thread_db_err_str (err)); return; } } static void disable_thread_event_reporting (void) { td_thr_events_t events; /* Set the process wide mask saying we aren't interested in any events anymore. */ td_event_emptyset (&events); td_ta_set_event_p (thread_agent, &events); td_create_bp_addr = 0; td_death_bp_addr = 0; } static void fbsd_thread_activate (void) { fbsd_thread_active = 1; init_thread_list(); if (target_has_execution) enable_thread_event_reporting (); fbsd_thread_find_new_threads (NULL); get_current_thread (); } static void fbsd_thread_deactivate (void) { if (target_has_execution) disable_thread_event_reporting(); td_ta_delete_p (thread_agent); inferior_ptid = pid_to_ptid (proc_handle.pid); proc_handle.pid = 0; fbsd_thread_active = 0; fbsd_thread_present = 0; } static void check_for_thread_db (void) { td_err_e err; if (td_ta_new_p == NULL) return; /* Nothing to do. The thread library was already detected and the target vector was already activated. */ if (fbsd_thread_active) return; /* Now, initialize libthread_db. This needs to be done after the shared libraries are located because it needs information from the user's thread library. */ err = td_init_p (); if (err != TD_OK) { warning ("Cannot initialize libthread_db: %s", thread_db_err_str (err)); return; } /* Initialize the structure that identifies the child process. Note that at this point there is no guarantee that we actually have a child process. */ proc_handle.pid = GET_PID (inferior_ptid); /* Now attempt to open a connection to the thread library. */ err = td_ta_new_p (&proc_handle, &thread_agent); switch (err) { case TD_NOLIBTHREAD: /* No thread library was detected. */ break; case TD_OK: /* The thread library was detected. Activate the thread_db target. */ push_target(&fbsd_thread_ops); fbsd_thread_present = 1; fbsd_thread_activate(); break; default: warning ("Cannot initialize thread debugging library: %s", thread_db_err_str (err)); break; } } static void fbsd_thread_new_objfile (struct objfile *objfile) { if (objfile != NULL) check_for_thread_db (); } static void fbsd_thread_detach (struct target_ops *ops, char *args, int from_tty) { struct target_ops *beneath = find_target_beneath (ops); fbsd_thread_deactivate (); /* Delete thread event breakpoints, if any. */ remove_thread_event_breakpoints (); unpush_target (&fbsd_thread_ops); beneath->to_detach (beneath, args, from_tty); } static int suspend_thread_callback (const td_thrhandle_t *th_p, void *data) { int err = td_thr_dbsuspend_p (th_p); if (err != 0) fprintf_filtered(gdb_stderr, "%s %s\n", __func__, thread_db_err_str (err)); return (err); } static int resume_thread_callback (const td_thrhandle_t *th_p, void *data) { int err = td_thr_dbresume_p (th_p); if (err != 0) fprintf_filtered(gdb_stderr, "%s %s\n", __func__, thread_db_err_str (err)); return (err); } static void fbsd_thread_resume (struct target_ops *ops, ptid_t ptid, int step, enum target_signal signo) { struct target_ops *beneath = find_target_beneath (ops); td_thrhandle_t th; td_thrinfo_t ti; ptid_t work_ptid; int resume_all, ret; long lwp, thvalid = 0; if (!fbsd_thread_active) { // XXX: I don't think this can happen printf_unfiltered ("%s: called without active threads\n", __func__); beneath->to_resume (beneath, ptid, step, signo); return; } if (GET_PID(ptid) != -1 && step != 0) { resume_all = 0; work_ptid = ptid; } else { resume_all = 1; work_ptid = inferior_ptid; } lwp = GET_LWP (work_ptid); if (lwp == 0) { /* check user thread */ ret = td_ta_map_id2thr_p (thread_agent, GET_THREAD(work_ptid), &th); if (ret) error ("%s: %s", __func__, thread_db_err_str (ret)); /* For M:N thread, we need to tell UTS to set/unset single step flag at context switch time, the flag will be written into thread mailbox. This becauses some architecture may not have machine single step flag in ucontext, so we put the flag in mailbox, when the thread switches back, kse_switchin restores the single step state. */ ret = td_thr_sstep_p (&th, step); if (ret) error ("%s: %s", __func__, thread_db_err_str (ret)); ret = td_thr_get_info_p (&th, &ti); if (ret) error ("%s: %s", __func__, thread_db_err_str (ret)); thvalid = 1; lwp = ti.ti_lid; } if (lwp) { int req = step ? PT_SETSTEP : PT_CLEARSTEP; if (ptrace (req, (pid_t) lwp, (caddr_t) 1, target_signal_to_host(signo))) perror_with_name ("PT_SETSTEP/PT_CLEARSTEP"); } if (!ptid_equal (last_single_step_thread, null_ptid)) { ret = td_ta_thr_iter_p (thread_agent, resume_thread_callback, NULL, TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); if (ret != TD_OK) error ("resume error: %s", thread_db_err_str (ret)); } if (!resume_all) { ret = td_ta_thr_iter_p (thread_agent, suspend_thread_callback, NULL, TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); if (ret != TD_OK) error ("suspend error: %s", thread_db_err_str (ret)); last_single_step_thread = work_ptid; } else last_single_step_thread = null_ptid; if (thvalid) { ret = td_thr_dbresume_p (&th); if (ret != TD_OK) error ("resume error: %s", thread_db_err_str (ret)); } else { /* it is not necessary, put it here for completness */ ret = ptrace(PT_RESUME, lwp, 0, 0); } /* now continue the process, suspended thread wont run */ if (ptrace (PT_CONTINUE, proc_handle.pid , (caddr_t)1, target_signal_to_host(signo))) perror_with_name ("PT_CONTINUE"); } static void attach_thread (ptid_t ptid, const td_thrhandle_t *th_p, const td_thrinfo_t *ti_p, int verbose) { td_err_e err; /* Add the thread to GDB's thread list. */ if (!in_thread_list (ptid)) add_thread (ptid); if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE) return; /* A zombie thread -- do not attach. */ if (! IS_THREAD(ptid)) return; if (!target_has_execution) return; /* Enable thread event reporting for this thread. */ err = td_thr_event_enable_p (th_p, 1); if (err != TD_OK) error ("Cannot enable thread event reporting for %s: %s", target_pid_to_str (ptid), thread_db_err_str (err)); } static void detach_thread (ptid_t ptid, int verbose) { if (verbose) printf_unfiltered ("[%s exited]\n", target_pid_to_str (ptid)); } static void check_event (ptid_t ptid) { struct regcache *regcache = get_thread_regcache (ptid); struct gdbarch *gdbarch = get_regcache_arch (regcache); td_event_msg_t msg; td_thrinfo_t ti; td_err_e err; CORE_ADDR stop_pc; int loop = 0; /* Bail out early if we're not at a thread event breakpoint. */ stop_pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch); if (stop_pc != td_create_bp_addr && stop_pc != td_death_bp_addr) return; loop = 1; do { err = td_ta_event_getmsg_p (thread_agent, &msg); if (err != TD_OK) { if (err == TD_NOMSG) return; error ("Cannot get thread event message: %s", thread_db_err_str (err)); } err = td_thr_get_info_p ((void *)(uintptr_t)msg.th_p, &ti); if (err != TD_OK) error ("Cannot get thread info: %s", thread_db_err_str (err)); ptid = BUILD_THREAD (ti.ti_tid, GET_PID (ptid)); switch (msg.event) { case TD_CREATE: /* We may already know about this thread, for instance when the user has issued the `info threads' command before the SIGTRAP for hitting the thread creation breakpoint was reported. */ attach_thread (ptid, (void *)(uintptr_t)msg.th_p, &ti, 1); break; case TD_DEATH: if (!in_thread_list (ptid)) error ("Spurious thread death event."); detach_thread (ptid, 1); break; default: error ("Spurious thread event."); } } while (loop); } static ptid_t fbsd_thread_wait (struct target_ops *ops, ptid_t ptid, struct target_waitstatus *ourstatus, int options) { struct target_ops *beneath = find_target_beneath (ops); ptid_t ret; long lwp; CORE_ADDR stop_pc; td_thrhandle_t th; td_thrinfo_t ti; ret = beneath->to_wait (beneath, ptid, ourstatus, options); if (GET_PID(ret) >= 0 && ourstatus->kind == TARGET_WAITKIND_STOPPED) { lwp = get_current_lwp (GET_PID(ret)); ret = thread_from_lwp (BUILD_LWP(lwp, GET_PID(ret)), &th, &ti); if (!in_thread_list(ret)) { /* * We have to enable event reporting for initial thread * which was not mapped before. */ attach_thread(ret, &th, &ti, 1); } if (ourstatus->value.sig == TARGET_SIGNAL_TRAP) check_event(ret); /* this is a hack, if an event won't cause gdb to stop, for example, SIGARLM, gdb resumes the process immediatly without setting inferior_ptid to the new thread returned here, this is a bug because inferior_ptid may already not exist there, and passing a none existing thread to fbsd_thread_resume causes error. */ if (!fbsd_thread_alive (ops, inferior_ptid)) { delete_thread (inferior_ptid); inferior_ptid = ret; } } return (ret); } static void fbsd_lwp_fetch_registers (struct target_ops *ops, struct regcache *regcache, int regnum) { gregset_t gregs; fpregset_t fpregs; lwpid_t lwp; #ifdef PT_GETXMMREGS char xmmregs[512]; #endif if (!target_has_execution) { struct target_ops *beneath = find_target_beneath (ops); beneath->to_fetch_registers (ops, regcache, regnum); return; } lwp = GET_LWP (inferior_ptid); if (ptrace (PT_GETREGS, lwp, (caddr_t) &gregs, 0) == -1) error ("Cannot get lwp %d registers: %s\n", lwp, safe_strerror (errno)); supply_gregset (regcache, &gregs); #ifdef PT_GETXMMREGS if (ptrace (PT_GETXMMREGS, lwp, xmmregs, 0) == 0) { i387_supply_fxsave (regcache, -1, xmmregs); } else { #endif if (ptrace (PT_GETFPREGS, lwp, (caddr_t) &fpregs, 0) == -1) error ("Cannot get lwp %d registers: %s\n ", lwp, safe_strerror (errno)); supply_fpregset (regcache, &fpregs); #ifdef PT_GETXMMREGS } #endif } static void fbsd_thread_fetch_registers (struct target_ops *ops, struct regcache *regcache, int regnum) { prgregset_t gregset; prfpregset_t fpregset; td_thrhandle_t th; td_err_e err; #ifdef PT_GETXMMREGS char xmmregs[512]; #endif if (!IS_THREAD (inferior_ptid)) { fbsd_lwp_fetch_registers (ops, regcache, regnum); return; } err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (inferior_ptid), &th); if (err != TD_OK) error ("Cannot find thread %d: Thread ID=%ld, %s", pid_to_thread_id (inferior_ptid), GET_THREAD (inferior_ptid), thread_db_err_str (err)); err = td_thr_getgregs_p (&th, gregset); if (err != TD_OK) error ("Cannot fetch general-purpose registers for thread %d: Thread ID=%ld, %s", pid_to_thread_id (inferior_ptid), GET_THREAD (inferior_ptid), thread_db_err_str (err)); #ifdef PT_GETXMMREGS err = td_thr_getxmmregs_p (&th, xmmregs); if (err == TD_OK) { i387_supply_fxsave (regcache, -1, xmmregs); } else { #endif err = td_thr_getfpregs_p (&th, &fpregset); if (err != TD_OK) error ("Cannot get floating-point registers for thread %d: Thread ID=%ld, %s", pid_to_thread_id (inferior_ptid), GET_THREAD (inferior_ptid), thread_db_err_str (err)); supply_fpregset (regcache, &fpregset); #ifdef PT_GETXMMREGS } #endif supply_gregset (regcache, gregset); } static void fbsd_lwp_store_registers (struct target_ops *ops, struct regcache *regcache, int regnum) { gregset_t gregs; fpregset_t fpregs; lwpid_t lwp; #ifdef PT_GETXMMREGS char xmmregs[512]; #endif /* FIXME, is it possible ? */ if (!IS_LWP (inferior_ptid)) { struct target_ops *beneath = find_target_beneath (ops); beneath->to_store_registers (ops, regcache, regnum); return ; } lwp = GET_LWP (inferior_ptid); if (regnum != -1) if (ptrace (PT_GETREGS, lwp, (caddr_t) &gregs, 0) == -1) error ("Cannot get lwp %d registers: %s\n", lwp, safe_strerror (errno)); fill_gregset (regcache, &gregs, regnum); if (ptrace (PT_SETREGS, lwp, (caddr_t) &gregs, 0) == -1) error ("Cannot set lwp %d registers: %s\n", lwp, safe_strerror (errno)); #ifdef PT_GETXMMREGS if (regnum != -1) if (ptrace (PT_GETXMMREGS, lwp, xmmregs, 0) == -1) goto noxmm; i387_collect_fxsave (regcache, regnum, xmmregs); if (ptrace (PT_SETXMMREGS, lwp, xmmregs, 0) == -1) goto noxmm; return; noxmm: #endif if (regnum != -1) if (ptrace (PT_GETFPREGS, lwp, (caddr_t) &fpregs, 0) == -1) error ("Cannot get lwp %d float registers: %s\n", lwp, safe_strerror (errno)); fill_fpregset (regcache, &fpregs, regnum); if (ptrace (PT_SETFPREGS, lwp, (caddr_t) &fpregs, 0) == -1) error ("Cannot set lwp %d float registers: %s\n", lwp, safe_strerror (errno)); } static void fbsd_thread_store_registers (struct target_ops *ops, struct regcache *regcache, int regnum) { prgregset_t gregset; prfpregset_t fpregset; td_thrhandle_t th; td_err_e err; #ifdef PT_GETXMMREGS char xmmregs[512]; #endif if (!IS_THREAD (inferior_ptid)) { fbsd_lwp_store_registers (ops, regcache, regnum); return; } err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (inferior_ptid), &th); if (err != TD_OK) error ("Cannot find thread %d: Thread ID=%ld, %s", pid_to_thread_id (inferior_ptid), GET_THREAD (inferior_ptid), thread_db_err_str (err)); if (regnum != -1) { char old_value[MAX_REGISTER_SIZE]; regcache_raw_collect (regcache, regnum, old_value); err = td_thr_getgregs_p (&th, gregset); if (err != TD_OK) error ("%s: td_thr_getgregs %s", __func__, thread_db_err_str (err)); #ifdef PT_GETXMMREGS err = td_thr_getxmmregs_p (&th, xmmregs); if (err != TD_OK) { #endif err = td_thr_getfpregs_p (&th, &fpregset); if (err != TD_OK) error ("%s: td_thr_getfpgregs %s", __func__, thread_db_err_str (err)); #ifdef PT_GETXMMREGS } #endif regcache_raw_supply (regcache, regnum, old_value); } fill_gregset (regcache, gregset, regnum); err = td_thr_setgregs_p (&th, gregset); if (err != TD_OK) error ("Cannot store general-purpose registers for thread %d: Thread ID=%ld, %s", pid_to_thread_id (inferior_ptid), GET_THREAD (inferior_ptid), thread_db_err_str (err)); #ifdef PT_GETXMMREGS i387_collect_fxsave (regcache, regnum, xmmregs); err = td_thr_setxmmregs_p (&th, xmmregs); if (err == TD_OK) return; #endif fill_fpregset (regcache, &fpregset, regnum); err = td_thr_setfpregs_p (&th, &fpregset); if (err != TD_OK) error ("Cannot store floating-point registers for thread %d: Thread ID=%ld, %s", pid_to_thread_id (inferior_ptid), GET_THREAD (inferior_ptid), thread_db_err_str (err)); } static void fbsd_thread_mourn_inferior (struct target_ops *ops) { struct target_ops *beneath = find_target_beneath (ops); fbsd_thread_deactivate (); beneath->to_mourn_inferior (beneath); /* Delete thread event breakpoints, if any. */ remove_thread_event_breakpoints (); unpush_target (ops); } static void fbsd_core_check_lwp (bfd *abfd, asection *asect, void *obj) { lwpid_t lwp; if (strncmp (bfd_section_name (abfd, asect), ".reg/", 5) != 0) return; /* already found */ if (*(lwpid_t *)obj == 0) return; lwp = atoi (bfd_section_name (abfd, asect) + 5); if (*(lwpid_t *)obj == lwp) *(lwpid_t *)obj = 0; } static int fbsd_thread_alive (struct target_ops *ops, ptid_t ptid) { td_thrhandle_t th; td_thrinfo_t ti; td_err_e err; gregset_t gregs; lwpid_t lwp; if (IS_THREAD (ptid)) { err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (ptid), &th); if (err != TD_OK) return 0; err = td_thr_get_info_p (&th, &ti); if (err != TD_OK) return 0; /* A zombie thread. */ if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) return 0; return 1; } else if (GET_LWP (ptid) == 0) { /* we sometimes are called with lwp == 0 */ return 1; } if (fbsd_thread_active) { err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (ptid), &th); /* * if the lwp was already mapped to user thread, don't use it * directly, please use user thread id instead. */ if (err == TD_OK) return 0; } if (!target_has_execution) { lwp = GET_LWP (ptid); bfd_map_over_sections (core_bfd, fbsd_core_check_lwp, &lwp); return (lwp == 0); } /* check lwp in kernel */ return ptrace (PT_GETREGS, GET_LWP (ptid), (caddr_t)&gregs, 0) == 0; } static int find_new_threads_callback (const td_thrhandle_t *th_p, void *data) { td_thrinfo_t ti; td_err_e err; ptid_t ptid; err = td_thr_get_info_p (th_p, &ti); if (err != TD_OK) error ("Cannot get thread info: %s", thread_db_err_str (err)); /* Ignore zombie */ if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) return 0; ptid = BUILD_THREAD (ti.ti_tid, proc_handle.pid); attach_thread (ptid, th_p, &ti, 1); return 0; } static void fbsd_thread_find_new_threads (struct target_ops *ops) { td_err_e err; /* Iterate over all user-space threads to discover new threads. */ err = td_ta_thr_iter_p (thread_agent, find_new_threads_callback, NULL, TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); if (err != TD_OK) error ("Cannot find new threads: %s", thread_db_err_str (err)); } static char * fbsd_thread_pid_to_str (struct target_ops *ops, ptid_t ptid) { static char buf[64]; if (IS_THREAD (ptid)) { td_thrhandle_t th; td_thrinfo_t ti; td_err_e err; err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (ptid), &th); if (err != TD_OK) error ("Cannot find thread, Thread ID=%ld, %s", GET_THREAD (ptid), thread_db_err_str (err)); err = td_thr_get_info_p (&th, &ti); if (err != TD_OK) error ("Cannot get thread info, Thread ID=%ld, %s", GET_THREAD (ptid), thread_db_err_str (err)); if (ti.ti_lid != 0) { snprintf (buf, sizeof (buf), "Thread %llx (LWP %d)", (unsigned long long)th.th_thread, ti.ti_lid); } else { snprintf (buf, sizeof (buf), "Thread %llx (%s)", (unsigned long long)th.th_thread, thread_db_state_str (ti.ti_state)); } return buf; } else if (IS_LWP (ptid)) { snprintf (buf, sizeof (buf), "LWP %d", (int) GET_LWP (ptid)); return buf; } return normal_pid_to_str (ptid); } CORE_ADDR fbsd_thread_get_local_address(struct target_ops *ops, ptid_t ptid, CORE_ADDR lm, CORE_ADDR offset) { td_thrhandle_t th; void *address; int ret; if (IS_THREAD (ptid)) { if (!td_thr_tls_get_addr_p) error ("Cannot find thread-local interface in thread_db library."); ret = td_ta_map_id2thr_p (thread_agent, GET_THREAD(ptid), &th); /* get the address of the variable. */ ret = td_thr_tls_get_addr_p (&th, (void *)lm, offset, &address); if (ret != TD_OK) { error ("Cannot find thread-local storage for thread %ld\n%s", (long) GET_THREAD (ptid), thread_db_err_str (ret)); } /* Cast assuming host == target. */ return extract_data_ptr (&address); } return (0); } static int tsd_cb (thread_key_t key, void (*destructor)(void *), void *ignore) { struct minimal_symbol *ms; char *name; ms = lookup_minimal_symbol_by_pc (extract_func_ptr (&destructor)); if (!ms) name = "???"; else name = SYMBOL_PRINT_NAME (ms); printf_filtered ("Destructor %p <%s>\n", destructor, name); return 0; } static void fbsd_thread_tsd_cmd (char *exp, int from_tty) { if (fbsd_thread_active) td_ta_tsd_iter_p (thread_agent, tsd_cb, NULL); } static void fbsd_print_sigset (sigset_t *set) { int i; for (i = 1; i <= _SIG_MAXSIG; ++i) { if (sigismember(set, i)) { if (i < sizeof(sys_signame)/sizeof(sys_signame[0])) printf_filtered("%s ", sys_signame[i]); else printf_filtered("sig%d ", i); } } printf_filtered("\n"); } static void fbsd_thread_signal_cmd (char *exp, int from_tty) { td_thrhandle_t th; td_thrinfo_t ti; td_err_e err; #ifdef PL_FLAG_SI const char *code; #endif if (!fbsd_thread_active || !IS_THREAD(inferior_ptid)) return; err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (inferior_ptid), &th); if (err != TD_OK) return; err = td_thr_get_info_p (&th, &ti); if (err != TD_OK) return; printf_filtered("signal mask:\n"); fbsd_print_sigset(&ti.ti_sigmask); printf_filtered("signal pending:\n"); fbsd_print_sigset(&ti.ti_pending); #ifdef PL_FLAG_SI if (ti.ti_siginfo.si_signo != 0) { printf_filtered("si_signo %d si_errno %d", ti.ti_siginfo.si_signo, ti.ti_siginfo.si_errno); if (ti.ti_siginfo.si_errno != 0) printf_filtered(" (%s)", strerror(ti.ti_siginfo.si_errno)); printf_filtered("\n"); switch (ti.ti_siginfo.si_code) { case SI_NOINFO: code = "NOINFO"; break; case SI_USER: code = "USER"; break; case SI_QUEUE: code = "QUEUE"; break; case SI_TIMER: code = "TIMER"; break; case SI_ASYNCIO: code = "ASYNCIO"; break; case SI_MESGQ: code = "MESGQ"; break; case SI_KERNEL: code = "KERNEL"; break; default: code = "UNKNOWN"; break; } printf_filtered("si_code %s si_pid %d si_uid %d si_status %x si_addr %p\n", code, ti.ti_siginfo.si_pid, ti.ti_siginfo.si_uid, ti.ti_siginfo.si_status, ti.ti_siginfo.si_addr); } #endif } static void init_fbsd_thread_ops (void) { fbsd_thread_ops.to_shortname = "freebsd-threads"; fbsd_thread_ops.to_longname = "FreeBSD multithreaded child process."; fbsd_thread_ops.to_doc = "FreeBSD threads support."; fbsd_thread_ops.to_detach = fbsd_thread_detach; fbsd_thread_ops.to_resume = fbsd_thread_resume; fbsd_thread_ops.to_wait = fbsd_thread_wait; fbsd_thread_ops.to_fetch_registers = fbsd_thread_fetch_registers; fbsd_thread_ops.to_store_registers = fbsd_thread_store_registers; fbsd_thread_ops.to_mourn_inferior = fbsd_thread_mourn_inferior; fbsd_thread_ops.to_thread_alive = fbsd_thread_alive; fbsd_thread_ops.to_find_new_threads = fbsd_thread_find_new_threads; fbsd_thread_ops.to_pid_to_str = fbsd_thread_pid_to_str; fbsd_thread_ops.to_stratum = thread_stratum; fbsd_thread_ops.to_get_thread_local_address = fbsd_thread_get_local_address; fbsd_thread_ops.to_magic = OPS_MAGIC; } static int thread_db_load (void) { void *handle; td_err_e err; handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW); if (handle == NULL) return 0; #define resolve(X) \ if (!(X##_p = dlsym (handle, #X))) \ return 0; resolve(td_init); resolve(td_ta_new); resolve(td_ta_delete); resolve(td_ta_map_id2thr); resolve(td_ta_map_lwp2thr); resolve(td_ta_thr_iter); resolve(td_thr_get_info); #ifdef PT_GETXMMREGS resolve(td_thr_getxmmregs); #endif resolve(td_thr_getfpregs); resolve(td_thr_getgregs); #ifdef PT_GETXMMREGS resolve(td_thr_setxmmregs); #endif resolve(td_thr_setfpregs); resolve(td_thr_setgregs); resolve(td_thr_sstep); resolve(td_ta_tsd_iter); resolve(td_thr_dbsuspend); resolve(td_thr_dbresume); resolve(td_thr_tls_get_addr); /* These are not essential. */ td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr"); td_ta_set_event_p = dlsym (handle, "td_ta_set_event"); td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg"); td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable"); td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr"); return 1; } void _initialize_thread_db (void) { init_fbsd_thread_ops (); if (thread_db_load ()) { add_target (&fbsd_thread_ops); /* "thread tsd" command */ add_cmd ("tsd", class_run, fbsd_thread_tsd_cmd, "Show the thread-specific data keys and destructors " "for the process.\n", &thread_cmd_list); add_cmd ("signal", class_run, fbsd_thread_signal_cmd, "Show the thread signal info.\n", &thread_cmd_list); /* Hook into new_objfile notification. */ observer_attach_new_objfile (fbsd_thread_new_objfile); } else { fprintf_unfiltered (gdb_stderr, "[GDB will not be able to debug user-mode threads: %s]\n", dlerror()); } } /* proc service functions */ void ps_plog (const char *fmt, ...) { va_list args; va_start (args, fmt); vfprintf_filtered (gdb_stderr, fmt, args); va_end (args); } ps_err_e ps_pglobal_lookup (struct ps_prochandle *ph, const char *obj, const char *name, psaddr_t *sym_addr) { struct minimal_symbol *ms; CORE_ADDR addr; ms = lookup_minimal_symbol (name, NULL, NULL); if (ms == NULL) return PS_NOSYM; *sym_addr = SYMBOL_VALUE_ADDRESS (ms); return PS_OK; } ps_err_e ps_pread (struct ps_prochandle *ph, psaddr_t addr, void *buf, size_t len) { int err = target_read_memory (extract_data_ptr (&addr), buf, len); return (err == 0 ? PS_OK : PS_ERR); } ps_err_e ps_pwrite (struct ps_prochandle *ph, psaddr_t addr, const void *buf, size_t len) { int err = target_write_memory (extract_data_ptr (&addr), (void *)buf, len); return (err == 0 ? PS_OK : PS_ERR); } ps_err_e ps_lgetregs (struct ps_prochandle *ph, lwpid_t lwpid, prgregset_t gregset) { struct cleanup *old_chain; struct regcache *regcache; old_chain = save_inferior_ptid (); inferior_ptid = BUILD_LWP (lwpid, ph->pid); regcache = get_thread_arch_regcache (inferior_ptid, target_gdbarch); target_fetch_registers (regcache, -1); fill_gregset (regcache, gregset, -1); do_cleanups (old_chain); return PS_OK; } ps_err_e ps_lsetregs (struct ps_prochandle *ph, lwpid_t lwpid, const prgregset_t gregset) { struct cleanup *old_chain; struct regcache *regcache; old_chain = save_inferior_ptid (); inferior_ptid = BUILD_LWP (lwpid, ph->pid); regcache = get_thread_arch_regcache (inferior_ptid, target_gdbarch); supply_gregset (regcache, gregset); target_store_registers (regcache, -1); do_cleanups (old_chain); return PS_OK; } ps_err_e ps_lgetfpregs (struct ps_prochandle *ph, lwpid_t lwpid, prfpregset_t *fpregset) { struct cleanup *old_chain; struct regcache *regcache; old_chain = save_inferior_ptid (); inferior_ptid = BUILD_LWP (lwpid, ph->pid); regcache = get_thread_arch_regcache (inferior_ptid, target_gdbarch); target_fetch_registers (regcache, -1); fill_fpregset (regcache, fpregset, -1); do_cleanups (old_chain); return PS_OK; } ps_err_e ps_lsetfpregs (struct ps_prochandle *ph, lwpid_t lwpid, const prfpregset_t *fpregset) { struct cleanup *old_chain; struct regcache *regcache; old_chain = save_inferior_ptid (); inferior_ptid = BUILD_LWP (lwpid, ph->pid); regcache = get_thread_arch_regcache (inferior_ptid, target_gdbarch); supply_fpregset (regcache, fpregset); target_store_registers (regcache, -1); do_cleanups (old_chain); return PS_OK; } #ifdef PT_GETXMMREGS ps_err_e ps_lgetxmmregs (struct ps_prochandle *ph, lwpid_t lwpid, char *xmmregs) { struct cleanup *old_chain; struct regcache *regcache; old_chain = save_inferior_ptid (); inferior_ptid = BUILD_LWP (lwpid, ph->pid); regcache = get_thread_arch_regcache (inferior_ptid, target_gdbarch); target_fetch_registers (regcache, -1); i387_collect_fxsave (regcache, -1, xmmregs); do_cleanups (old_chain); return PS_OK; } ps_err_e ps_lsetxmmregs (struct ps_prochandle *ph, lwpid_t lwpid, const char *xmmregs) { struct cleanup *old_chain; struct regcache *regcache; old_chain = save_inferior_ptid (); inferior_ptid = BUILD_LWP (lwpid, ph->pid); regcache = get_thread_arch_regcache (inferior_ptid, target_gdbarch); i387_supply_fxsave (regcache, -1, xmmregs); target_store_registers (regcache, -1); do_cleanups (old_chain); return PS_OK; } #endif ps_err_e ps_lstop(struct ps_prochandle *ph, lwpid_t lwpid) { if (ptrace (PT_SUSPEND, lwpid, 0, 0) == -1) return PS_ERR; return PS_OK; } ps_err_e ps_lcontinue(struct ps_prochandle *ph, lwpid_t lwpid) { if (ptrace (PT_RESUME, lwpid, 0, 0) == -1) return PS_ERR; return PS_OK; } ps_err_e ps_linfo(struct ps_prochandle *ph, lwpid_t lwpid, void *info) { if (!target_has_execution) { /* XXX should verify lwpid and make a pseudo lwp info */ memset(info, 0, sizeof(struct ptrace_lwpinfo)); return PS_OK; } if (ptrace (PT_LWPINFO, lwpid, info, sizeof(struct ptrace_lwpinfo)) == -1) return PS_ERR; return PS_OK; }