10d6c8cd3f
(alpha-linux-nat.o, sparc-linux-nat.o): New rules. (amd64-linux-nat.o, arm-linux-nat.o, hppa-linux-nat.o) (i386-linux-nat.o, ia64-linux-nat.o, linux-nat.o, m32r-linux-nat.o) (m68klinux-nat.o, mips-linux-nat.o, ppc-linux-nat.o, s390-nat.o) (sparc64-linux-nat.o): Update dependencies. * alpha-linux-nat.c, sparc-linux-nat.c: New files. * amd64-linux-nat.c (amd64_linux_fetch_inferior_registers): Renamed from fetch_inferior_registers and made static. (amd64_linux_store_inferior_registers): Renamed from store_inferior_registers and made static. (amd64_linux_child_post_start_inferior): Renamed from child_post_startup_inferior and made static. Call super_post_startup_inferior. (super_post_startup_inferior): New. (_initialize_amd64_linux_nat): Set it. Call linux_target and add_target. * arm-linux-nat.c (arm_linux_fetch_inferior_registers): Renamed from fetch_inferior_registers and made static. (arm_linux_store_inferior_registers): Renamed from store_inferior_registers and made static. (_initialize_arm_linux_nat): Add a prototype. Use linux_target and add_target. * hppa-linux-nat.c (hppa_linux_fetch_inferior_registers): Renamed from fetch_inferior_registers and made static. (hppa_linux_store_inferior_registers): Renamed from store_inferior_registers and made static. (_initialize_hppa_linux_nat): New function. * i386-linux-nat.c (i386_linux_fetch_inferior_registers): Renamed from fetch_inferior_registers and made static. (i386_linux_store_inferior_registers): Renamed from store_inferior_registers and made static. (i386_linux_resume): Renamed from child_resume and made static. (i386_linux_child_post_start_inferior): Renamed from child_post_startup_inferior and made static. Call super_post_startup_inferior. (super_post_startup_inferior): New. (_initialize_i386_linux_nat): New function. * i386-nat.c: Remove LINUX_CHILD_POST_STARTUP_INFERIOR #ifndef. * ia64-linux-nat.c (ia64_linux_xfer_unwind_table): Remove. (super_xfer_partial): New. (ia64_linux_xfer_partial): New function. Use it. (_initialize_ia64_linux_nat): New function. * ia64-tdep.c (getunwind_table): Revert 2005-06-08 change; use target_read_partial and document the problem. * inf-ptrace.c (inf_ptrace_fetch_register): Use CANNOT_FETCH_REGISTER. Fix some comments. (inf_ptrace_store_register): Use CANNOT_STORE_REGISTER. Fix some comments. * linux-nat.c: Include "inf-ptrace.h" and "auxv.h". (linux_ops, super_xfer_partial): New variables. (linux_child_post_startup_inferior): Make static. (child_post_startup_inferior): Delete. (linux_nat_attach, linux_nat_detach, resume_callback) (linux_nat_resume, linux_nat_wait, linux_nat_create_inferior) (linux_nat_mourn_inferior): Use linux_ops instead of deprecated_child_ops. (child_wait): Do not depend on CHILD_WAIT. (linux_nat_xfer_memory): Remove, replace by ... (linux_nat_xfer_partial): ... this. Use linux_ops->to_xfer_partial instead of linux_proc_xfer_memory and child_xfer_memory. (linux_nat_fetch_registers, linux_nat_store_registers) (linux_nat_child_post_startup_inferior): New functions. (init_linux_nat_ops): Use the new functions. (linux_proc_xfer_memory): Remove, replace by ... (linux_proc_xfer_partial): ... this. Make static. (linux_xfer_partial, linux_register_u_offset, linux_target): New functions. (_initialize_linux_nat): Do not modify deprecated_child_ops. * linux-nat.h (linux_proc_xfer_memory): Remove prototype. (struct mem_attrib, struct target_ops): Remove forward declarations. (linux_child_post_startup_inferior): Remove prototype. (linux_target): Add prototype. * linux-thread-db.c (thread_db_xfer_memory): Remove, replace by ... (thread_db_xfer_partial): ... this. (init_thread_db_ops): Set to_xfer_partial instead of deprecated_xfer_memory. * m32r-linux-nat.c (m32r_linux_fetch_inferior_registers): Renamed from fetch_inferior_registers and made static. (m32r_linux_store_inferior_registers): Renamed from store_inferior_registers and made static. (_initialize_m32r_linux_nat): New function. * m68klinux-nat.c (m68k_linux_fetch_inferior_registers): Renamed from fetch_inferior_registers and made static. (m68k_linux_store_inferior_registers): Renamed from store_inferior_registers and made static. (old_fetch_inferior_registers, old_store_inferior_registers): Made static. (_initialize_m68k_linux_nat): Use linux_target and add_target. * mips-linux-nat.c (_initialize_mips_linux_nat): New function. * ppc-linux-nat.c (ppc_linux_fetch_inferior_registers): Renamed from fetch_inferior_registers and made static. (ppc_linux_store_inferior_registers): Renamed from store_inferior_registers and made static. (_initialize_ppc_linux_nat): New function. * s390-nat.c (s390_linux_fetch_inferior_registers): Renamed from fetch_inferior_registers and made static. (s390_linux_store_inferior_registers): Renamed from store_inferior_registers and made static. (_initialize_s390_nat): New function. * sparc64-linux-nat.c (_initialize_sparc64_linux_nat): Use linux_target and add_target. * config/nm-linux.h: Don't include "auxv.h". (struct target_waitstatus, child_wait, CHILD_WAIT) (CHILD_PID_TO_EXEC_FILE, CHILD_INSERT_FORK_CATCHPOINT) (CHILD_INSERT_VFORK_CATCHPOINT, CHILD_INSERT_EXEC_CATCHPOINT) (CHILD_POST_STARTUP_INFERIOR, CHILD_POST_ATTACH, CHILD_FOLLOW_FORK) (DEPRECATED_KILL_INFERIOR, NATIVE_XFER_AUXV): Delete. * config/alpha/alpha-linux.mh (NATDEPFILES): Replace infptrace.o and inftarg.o with inf-ptrace.o and alpha-linux-nat.o. * config/sparc/linux.mh (NATDEPFILES): Replace infptrace.o and inftarg.o with sparc-linux-nat.o. * config/sparc/linux64.mh (NATDEPFILES): Remove infptrace.o and inftarg.o. * config/arm/linux.mh (NATDEPFILES): Replace infptrace.o and inftarg.o with inf-ptrace.o. * config/i386/linux.mh (NATDEPFILES): Likewise. * config/i386/linux64.mh (NATDEPFILES): Likewise. * config/ia64/linux.mh (NATDEPFILES): Likewise. * config/m32r/linux.mh (NATDEPFILES): Likewise. * config/m68k/linux.mh (NATDEPFILES): Likewise. * config/mips/linux.mh (NATDEPFILES): Likewise. * config/pa/linux.mh (NATDEPFILES): Likewise. * config/powerpc/linux.mh (NATDEPFILES): Likewise. * config/powerpc/ppc64-linux.mh (NATDEPFILES): Likewise. * config/s390/s390.mh (NATDEPFILES): Likewise. * config/i386/nm-linux.h (DEPRECATED_CHILD_RESUME): Don't define. (LINUX_CHILD_POST_STARTUP_INFERIOR): Don't define. * config/i386/nm-linux64.h (LINUX_CHILD_POST_STARTUP_INFERIOR): Don't define. * config/ia64/nm-linux.h: Don't include "target.h". (NATIVE_XFER_UNWIND_TABLE, ia64_linux_xfer_unwind_table): Remove. * config/djgpp/fnchange.lst: Add alpha-linux-tdep.c, alpha-linux-nat.c, sparc-linux-tdep.c, and sparc-linux-nat.c.
1330 lines
38 KiB
C
1330 lines
38 KiB
C
/* libthread_db assisted debugging support, generic parts.
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Copyright 1999, 2000, 2001, 2003, 2004, 2005
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Free Software Foundation, Inc.
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This file is part of GDB.
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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
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
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||
|
||
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,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "gdb_assert.h"
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#include <dlfcn.h>
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#include "gdb_proc_service.h"
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#include "gdb_thread_db.h"
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#include "bfd.h"
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#include "exceptions.h"
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#include "gdbthread.h"
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#include "inferior.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "target.h"
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#include "regcache.h"
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#include "solib-svr4.h"
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#ifdef HAVE_GNU_LIBC_VERSION_H
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#include <gnu/libc-version.h>
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#endif
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#ifndef LIBTHREAD_DB_SO
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#define LIBTHREAD_DB_SO "libthread_db.so.1"
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#endif
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/* If we're running on GNU/Linux, we must explicitly attach to any new
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threads. */
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/* FIXME: There is certainly some room for improvements:
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- Cache LWP ids.
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- Bypass libthread_db when fetching or storing registers for
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threads bound to a LWP. */
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/* This module's target vector. */
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static struct target_ops thread_db_ops;
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/* The target vector that we call for things this module can't handle. */
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static struct target_ops *target_beneath;
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/* Pointer to the next function on the objfile event chain. */
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static void (*target_new_objfile_chain) (struct objfile * objfile);
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/* Non-zero if we're using this module's target vector. */
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static int using_thread_db;
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/* Non-zero if we have determined the signals used by the threads
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library. */
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static int thread_signals;
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static sigset_t thread_stop_set;
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static sigset_t thread_print_set;
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/* Structure that identifies the child process for the
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<proc_service.h> interface. */
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static struct ps_prochandle proc_handle;
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/* Connection to the libthread_db library. */
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static td_thragent_t *thread_agent;
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/* Pointers to the libthread_db functions. */
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static td_err_e (*td_init_p) (void);
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static td_err_e (*td_ta_new_p) (struct ps_prochandle * ps,
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td_thragent_t **ta);
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static td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt,
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td_thrhandle_t *__th);
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static td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta,
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lwpid_t lwpid, td_thrhandle_t *th);
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static td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta,
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td_thr_iter_f *callback, void *cbdata_p,
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td_thr_state_e state, int ti_pri,
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sigset_t *ti_sigmask_p,
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unsigned int ti_user_flags);
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static td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta,
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td_event_e event, td_notify_t *ptr);
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static td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta,
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td_thr_events_t *event);
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static td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta,
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td_event_msg_t *msg);
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static td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th);
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static td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th,
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td_thrinfo_t *infop);
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static td_err_e (*td_thr_getfpregs_p) (const td_thrhandle_t *th,
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gdb_prfpregset_t *regset);
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static td_err_e (*td_thr_getgregs_p) (const td_thrhandle_t *th,
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prgregset_t gregs);
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static td_err_e (*td_thr_setfpregs_p) (const td_thrhandle_t *th,
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const gdb_prfpregset_t *fpregs);
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static td_err_e (*td_thr_setgregs_p) (const td_thrhandle_t *th,
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prgregset_t gregs);
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static td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th,
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int event);
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static td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th,
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void *map_address,
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size_t offset, void **address);
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/* Location of the thread creation event breakpoint. The code at this
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location in the child process will be called by the pthread library
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whenever a new thread is created. By setting a special breakpoint
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at this location, GDB can detect when a new thread is created. We
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obtain this location via the td_ta_event_addr call. */
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static CORE_ADDR td_create_bp_addr;
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/* Location of the thread death event breakpoint. */
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static CORE_ADDR td_death_bp_addr;
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/* Prototypes for local functions. */
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static void thread_db_find_new_threads (void);
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static void attach_thread (ptid_t ptid, const td_thrhandle_t *th_p,
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const td_thrinfo_t *ti_p, int verbose);
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static void detach_thread (ptid_t ptid, int verbose);
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/* Building process ids. */
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#define GET_PID(ptid) ptid_get_pid (ptid)
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#define GET_LWP(ptid) ptid_get_lwp (ptid)
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#define GET_THREAD(ptid) ptid_get_tid (ptid)
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#define is_lwp(ptid) (GET_LWP (ptid) != 0)
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#define is_thread(ptid) (GET_THREAD (ptid) != 0)
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#define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0)
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/* Use "struct private_thread_info" to cache thread state. This is
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a substantial optimization. */
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struct private_thread_info
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{
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/* Flag set when we see a TD_DEATH event for this thread. */
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unsigned int dying:1;
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/* Cached thread state. */
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unsigned int th_valid:1;
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unsigned int ti_valid:1;
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td_thrhandle_t th;
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td_thrinfo_t ti;
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};
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static char *
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thread_db_err_str (td_err_e err)
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{
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static char buf[64];
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switch (err)
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{
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case TD_OK:
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return "generic 'call succeeded'";
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case TD_ERR:
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return "generic error";
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case TD_NOTHR:
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return "no thread to satisfy query";
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case TD_NOSV:
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return "no sync handle to satisfy query";
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case TD_NOLWP:
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return "no LWP to satisfy query";
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case TD_BADPH:
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return "invalid process handle";
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case TD_BADTH:
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return "invalid thread handle";
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case TD_BADSH:
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return "invalid synchronization handle";
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case TD_BADTA:
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return "invalid thread agent";
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case TD_BADKEY:
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return "invalid key";
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case TD_NOMSG:
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return "no event message for getmsg";
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case TD_NOFPREGS:
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return "FPU register set not available";
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case TD_NOLIBTHREAD:
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return "application not linked with libthread";
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case TD_NOEVENT:
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return "requested event is not supported";
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case TD_NOCAPAB:
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return "capability not available";
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case TD_DBERR:
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return "debugger service failed";
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case TD_NOAPLIC:
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return "operation not applicable to";
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case TD_NOTSD:
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return "no thread-specific data for this thread";
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case TD_MALLOC:
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return "malloc failed";
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case TD_PARTIALREG:
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return "only part of register set was written/read";
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case TD_NOXREGS:
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return "X register set not available for this thread";
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default:
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snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err);
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return buf;
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}
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}
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static char *
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thread_db_state_str (td_thr_state_e state)
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{
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static char buf[64];
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switch (state)
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{
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case TD_THR_STOPPED:
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return "stopped by debugger";
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case TD_THR_RUN:
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return "runnable";
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case TD_THR_ACTIVE:
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return "active";
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case TD_THR_ZOMBIE:
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return "zombie";
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case TD_THR_SLEEP:
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return "sleeping";
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case TD_THR_STOPPED_ASLEEP:
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return "stopped by debugger AND blocked";
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default:
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snprintf (buf, sizeof (buf), "unknown thread_db state %d", state);
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return buf;
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}
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}
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/* A callback function for td_ta_thr_iter, which we use to map all
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threads to LWPs.
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THP is a handle to the current thread; if INFOP is not NULL, the
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struct thread_info associated with this thread is returned in
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*INFOP.
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If the thread is a zombie, TD_THR_ZOMBIE is returned. Otherwise,
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zero is returned to indicate success. */
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static int
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thread_get_info_callback (const td_thrhandle_t *thp, void *infop)
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{
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td_thrinfo_t ti;
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td_err_e err;
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struct thread_info *thread_info;
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ptid_t thread_ptid;
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err = td_thr_get_info_p (thp, &ti);
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if (err != TD_OK)
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error (_("thread_get_info_callback: cannot get thread info: %s"),
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thread_db_err_str (err));
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/* Fill the cache. */
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thread_ptid = ptid_build (GET_PID (inferior_ptid), ti.ti_lid, ti.ti_tid);
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thread_info = find_thread_pid (thread_ptid);
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/* In the case of a zombie thread, don't continue. We don't want to
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attach to it thinking it is a new thread. */
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if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE)
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{
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if (infop != NULL)
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*(struct thread_info **) infop = thread_info;
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if (thread_info != NULL)
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{
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memcpy (&thread_info->private->th, thp, sizeof (*thp));
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thread_info->private->th_valid = 1;
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memcpy (&thread_info->private->ti, &ti, sizeof (ti));
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thread_info->private->ti_valid = 1;
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}
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return TD_THR_ZOMBIE;
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||
}
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||
|
||
if (thread_info == NULL)
|
||
{
|
||
/* New thread. Attach to it now (why wait?). */
|
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attach_thread (thread_ptid, thp, &ti, 1);
|
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thread_info = find_thread_pid (thread_ptid);
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gdb_assert (thread_info != NULL);
|
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}
|
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|
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memcpy (&thread_info->private->th, thp, sizeof (*thp));
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thread_info->private->th_valid = 1;
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memcpy (&thread_info->private->ti, &ti, sizeof (ti));
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thread_info->private->ti_valid = 1;
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||
|
||
if (infop != NULL)
|
||
*(struct thread_info **) infop = thread_info;
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Accessor functions for the thread_db information, with caching. */
|
||
|
||
static void
|
||
thread_db_map_id2thr (struct thread_info *thread_info, int fatal)
|
||
{
|
||
td_err_e err;
|
||
|
||
if (thread_info->private->th_valid)
|
||
return;
|
||
|
||
err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (thread_info->ptid),
|
||
&thread_info->private->th);
|
||
if (err != TD_OK)
|
||
{
|
||
if (fatal)
|
||
error (_("Cannot find thread %ld: %s"),
|
||
(long) GET_THREAD (thread_info->ptid),
|
||
thread_db_err_str (err));
|
||
}
|
||
else
|
||
thread_info->private->th_valid = 1;
|
||
}
|
||
|
||
static td_thrinfo_t *
|
||
thread_db_get_info (struct thread_info *thread_info)
|
||
{
|
||
td_err_e err;
|
||
|
||
if (thread_info->private->ti_valid)
|
||
return &thread_info->private->ti;
|
||
|
||
if (!thread_info->private->th_valid)
|
||
thread_db_map_id2thr (thread_info, 1);
|
||
|
||
err =
|
||
td_thr_get_info_p (&thread_info->private->th, &thread_info->private->ti);
|
||
if (err != TD_OK)
|
||
error (_("thread_db_get_info: cannot get thread info: %s"),
|
||
thread_db_err_str (err));
|
||
|
||
thread_info->private->ti_valid = 1;
|
||
return &thread_info->private->ti;
|
||
}
|
||
|
||
/* Convert between user-level thread ids and LWP ids. */
|
||
|
||
static ptid_t
|
||
thread_from_lwp (ptid_t ptid)
|
||
{
|
||
td_thrhandle_t th;
|
||
td_err_e err;
|
||
struct thread_info *thread_info;
|
||
ptid_t thread_ptid;
|
||
|
||
if (GET_LWP (ptid) == 0)
|
||
ptid = BUILD_LWP (GET_PID (ptid), GET_PID (ptid));
|
||
|
||
gdb_assert (is_lwp (ptid));
|
||
|
||
err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (ptid), &th);
|
||
if (err != TD_OK)
|
||
error (_("Cannot find user-level thread for LWP %ld: %s"),
|
||
GET_LWP (ptid), thread_db_err_str (err));
|
||
|
||
thread_info = NULL;
|
||
|
||
/* Fetch the thread info. If we get back TD_THR_ZOMBIE, then the
|
||
event thread has already died. If another gdb interface has called
|
||
thread_alive() previously, the thread won't be found on the thread list
|
||
anymore. In that case, we don't want to process this ptid anymore
|
||
to avoid the possibility of later treating it as a newly
|
||
discovered thread id that we should add to the list. Thus,
|
||
we return a -1 ptid which is also how the thread list marks a
|
||
dead thread. */
|
||
if (thread_get_info_callback (&th, &thread_info) == TD_THR_ZOMBIE
|
||
&& thread_info == NULL)
|
||
return pid_to_ptid (-1);
|
||
|
||
gdb_assert (thread_info && thread_info->private->ti_valid);
|
||
|
||
return ptid_build (GET_PID (ptid), GET_LWP (ptid),
|
||
thread_info->private->ti.ti_tid);
|
||
}
|
||
|
||
static ptid_t
|
||
lwp_from_thread (ptid_t ptid)
|
||
{
|
||
return BUILD_LWP (GET_LWP (ptid), GET_PID (ptid));
|
||
}
|
||
|
||
|
||
void
|
||
thread_db_init (struct target_ops *target)
|
||
{
|
||
target_beneath = target;
|
||
}
|
||
|
||
static void *
|
||
verbose_dlsym (void *handle, const char *name)
|
||
{
|
||
void *sym = dlsym (handle, name);
|
||
if (sym == NULL)
|
||
warning (_("Symbol \"%s\" not found in libthread_db: %s"), name, dlerror ());
|
||
return sym;
|
||
}
|
||
|
||
static int
|
||
thread_db_load (void)
|
||
{
|
||
void *handle;
|
||
td_err_e err;
|
||
|
||
handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW);
|
||
if (handle == NULL)
|
||
{
|
||
fprintf_filtered (gdb_stderr, "\n\ndlopen failed on '%s' - %s\n",
|
||
LIBTHREAD_DB_SO, dlerror ());
|
||
fprintf_filtered (gdb_stderr,
|
||
"GDB will not be able to debug pthreads.\n\n");
|
||
return 0;
|
||
}
|
||
|
||
/* Initialize pointers to the dynamic library functions we will use.
|
||
Essential functions first. */
|
||
|
||
td_init_p = verbose_dlsym (handle, "td_init");
|
||
if (td_init_p == NULL)
|
||
return 0;
|
||
|
||
td_ta_new_p = verbose_dlsym (handle, "td_ta_new");
|
||
if (td_ta_new_p == NULL)
|
||
return 0;
|
||
|
||
td_ta_map_id2thr_p = verbose_dlsym (handle, "td_ta_map_id2thr");
|
||
if (td_ta_map_id2thr_p == NULL)
|
||
return 0;
|
||
|
||
td_ta_map_lwp2thr_p = verbose_dlsym (handle, "td_ta_map_lwp2thr");
|
||
if (td_ta_map_lwp2thr_p == NULL)
|
||
return 0;
|
||
|
||
td_ta_thr_iter_p = verbose_dlsym (handle, "td_ta_thr_iter");
|
||
if (td_ta_thr_iter_p == NULL)
|
||
return 0;
|
||
|
||
td_thr_validate_p = verbose_dlsym (handle, "td_thr_validate");
|
||
if (td_thr_validate_p == NULL)
|
||
return 0;
|
||
|
||
td_thr_get_info_p = verbose_dlsym (handle, "td_thr_get_info");
|
||
if (td_thr_get_info_p == NULL)
|
||
return 0;
|
||
|
||
td_thr_getfpregs_p = verbose_dlsym (handle, "td_thr_getfpregs");
|
||
if (td_thr_getfpregs_p == NULL)
|
||
return 0;
|
||
|
||
td_thr_getgregs_p = verbose_dlsym (handle, "td_thr_getgregs");
|
||
if (td_thr_getgregs_p == NULL)
|
||
return 0;
|
||
|
||
td_thr_setfpregs_p = verbose_dlsym (handle, "td_thr_setfpregs");
|
||
if (td_thr_setfpregs_p == NULL)
|
||
return 0;
|
||
|
||
td_thr_setgregs_p = verbose_dlsym (handle, "td_thr_setgregs");
|
||
if (td_thr_setgregs_p == NULL)
|
||
return 0;
|
||
|
||
/* Initialize the library. */
|
||
err = td_init_p ();
|
||
if (err != TD_OK)
|
||
{
|
||
warning (_("Cannot initialize libthread_db: %s"), thread_db_err_str (err));
|
||
return 0;
|
||
}
|
||
|
||
/* 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;
|
||
}
|
||
|
||
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 (current_gdbarch,
|
||
(CORE_ADDR) notify.u.bptaddr,
|
||
¤t_target);
|
||
create_thread_event_breakpoint ((*bp));
|
||
|
||
return TD_OK;
|
||
}
|
||
|
||
static void
|
||
enable_thread_event_reporting (void)
|
||
{
|
||
td_thr_events_t events;
|
||
td_notify_t notify;
|
||
td_err_e err;
|
||
#ifdef HAVE_GNU_LIBC_VERSION_H
|
||
const char *libc_version;
|
||
int libc_major, libc_minor;
|
||
#endif
|
||
|
||
/* 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);
|
||
|
||
#ifdef HAVE_GNU_LIBC_VERSION_H
|
||
/* FIXME: kettenis/2000-04-23: The event reporting facility is
|
||
broken for TD_DEATH events in glibc 2.1.3, so don't enable it for
|
||
now. */
|
||
libc_version = gnu_get_libc_version ();
|
||
if (sscanf (libc_version, "%d.%d", &libc_major, &libc_minor) == 2
|
||
&& (libc_major > 2 || (libc_major == 2 && libc_minor > 1)))
|
||
#endif
|
||
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);
|
||
|
||
/* Delete thread event breakpoints, if any. */
|
||
remove_thread_event_breakpoints ();
|
||
td_create_bp_addr = 0;
|
||
td_death_bp_addr = 0;
|
||
}
|
||
|
||
static void
|
||
check_thread_signals (void)
|
||
{
|
||
#ifdef GET_THREAD_SIGNALS
|
||
if (!thread_signals)
|
||
{
|
||
sigset_t mask;
|
||
int i;
|
||
|
||
GET_THREAD_SIGNALS (&mask);
|
||
sigemptyset (&thread_stop_set);
|
||
sigemptyset (&thread_print_set);
|
||
|
||
for (i = 1; i < NSIG; i++)
|
||
{
|
||
if (sigismember (&mask, i))
|
||
{
|
||
if (signal_stop_update (target_signal_from_host (i), 0))
|
||
sigaddset (&thread_stop_set, i);
|
||
if (signal_print_update (target_signal_from_host (i), 0))
|
||
sigaddset (&thread_print_set, i);
|
||
thread_signals = 1;
|
||
}
|
||
}
|
||
}
|
||
#endif
|
||
}
|
||
|
||
static void
|
||
thread_db_new_objfile (struct objfile *objfile)
|
||
{
|
||
td_err_e err;
|
||
|
||
/* First time through, report that libthread_db was successfuly
|
||
loaded. Can't print this in in thread_db_load as, at that stage,
|
||
the interpreter and it's console haven't started. The real
|
||
problem here is that libthread_db is loaded too early - it should
|
||
only be loaded when there is a program to debug. */
|
||
{
|
||
static int dejavu;
|
||
if (!dejavu)
|
||
{
|
||
Dl_info info;
|
||
const char *library = NULL;
|
||
/* Try dladdr. */
|
||
if (dladdr ((*td_ta_new_p), &info) != 0)
|
||
library = info.dli_fname;
|
||
/* Try dlinfo? */
|
||
if (library == NULL)
|
||
/* Paranoid - don't let a NULL path slip through. */
|
||
library = LIBTHREAD_DB_SO;
|
||
printf_unfiltered (_("Using host libthread_db library \"%s\".\n"),
|
||
library);
|
||
dejavu = 1;
|
||
}
|
||
}
|
||
|
||
/* Don't attempt to use thread_db on targets which can not run
|
||
(core files). */
|
||
if (objfile == NULL || !target_has_execution)
|
||
{
|
||
/* All symbols have been discarded. If the thread_db target is
|
||
active, deactivate it now. */
|
||
if (using_thread_db)
|
||
{
|
||
gdb_assert (proc_handle.pid == 0);
|
||
unpush_target (&thread_db_ops);
|
||
using_thread_db = 0;
|
||
}
|
||
|
||
goto quit;
|
||
}
|
||
|
||
if (using_thread_db)
|
||
/* Nothing to do. The thread library was already detected and the
|
||
target vector was already activated. */
|
||
goto quit;
|
||
|
||
/* 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:
|
||
printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n"));
|
||
|
||
/* The thread library was detected. Activate the thread_db target. */
|
||
push_target (&thread_db_ops);
|
||
using_thread_db = 1;
|
||
|
||
enable_thread_event_reporting ();
|
||
thread_db_find_new_threads ();
|
||
break;
|
||
|
||
default:
|
||
warning (_("Cannot initialize thread debugging library: %s"),
|
||
thread_db_err_str (err));
|
||
break;
|
||
}
|
||
|
||
quit:
|
||
if (target_new_objfile_chain)
|
||
target_new_objfile_chain (objfile);
|
||
}
|
||
|
||
/* Attach to a new thread. This function is called when we receive a
|
||
TD_CREATE event or when we iterate over all threads and find one
|
||
that wasn't already in our list. */
|
||
|
||
static void
|
||
attach_thread (ptid_t ptid, const td_thrhandle_t *th_p,
|
||
const td_thrinfo_t *ti_p, int verbose)
|
||
{
|
||
struct thread_info *tp;
|
||
td_err_e err;
|
||
|
||
/* If we're being called after a TD_CREATE event, we may already
|
||
know about this thread. There are two ways this can happen. We
|
||
may have iterated over all threads between the thread creation
|
||
and the TD_CREATE event, for instance when the user has issued
|
||
the `info threads' command before the SIGTRAP for hitting the
|
||
thread creation breakpoint was reported. Alternatively, the
|
||
thread may have exited and a new one been created with the same
|
||
thread ID. In the first case we don't need to do anything; in
|
||
the second case we should discard information about the dead
|
||
thread and attach to the new one. */
|
||
if (in_thread_list (ptid))
|
||
{
|
||
tp = find_thread_pid (ptid);
|
||
gdb_assert (tp != NULL);
|
||
|
||
if (!tp->private->dying)
|
||
return;
|
||
|
||
delete_thread (ptid);
|
||
}
|
||
|
||
check_thread_signals ();
|
||
|
||
/* Add the thread to GDB's thread list. */
|
||
tp = add_thread (ptid);
|
||
tp->private = xmalloc (sizeof (struct private_thread_info));
|
||
memset (tp->private, 0, sizeof (struct private_thread_info));
|
||
|
||
if (verbose)
|
||
printf_unfiltered (_("[New %s]\n"), target_pid_to_str (ptid));
|
||
|
||
if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE)
|
||
return; /* A zombie thread -- do not attach. */
|
||
|
||
/* Under GNU/Linux, we have to attach to each and every thread. */
|
||
#ifdef ATTACH_LWP
|
||
ATTACH_LWP (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid)), 0);
|
||
#endif
|
||
|
||
/* 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
|
||
thread_db_attach (char *args, int from_tty)
|
||
{
|
||
target_beneath->to_attach (args, from_tty);
|
||
|
||
/* Destroy thread info; it's no longer valid. */
|
||
init_thread_list ();
|
||
|
||
/* The child process is now the actual multi-threaded
|
||
program. Snatch its process ID... */
|
||
proc_handle.pid = GET_PID (inferior_ptid);
|
||
|
||
/* ...and perform the remaining initialization steps. */
|
||
enable_thread_event_reporting ();
|
||
thread_db_find_new_threads ();
|
||
}
|
||
|
||
static void
|
||
detach_thread (ptid_t ptid, int verbose)
|
||
{
|
||
struct thread_info *thread_info;
|
||
|
||
if (verbose)
|
||
printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (ptid));
|
||
|
||
/* Don't delete the thread now, because it still reports as active
|
||
until it has executed a few instructions after the event
|
||
breakpoint - if we deleted it now, "info threads" would cause us
|
||
to re-attach to it. Just mark it as having had a TD_DEATH
|
||
event. This means that we won't delete it from our thread list
|
||
until we notice that it's dead (via prune_threads), or until
|
||
something re-uses its thread ID. */
|
||
thread_info = find_thread_pid (ptid);
|
||
gdb_assert (thread_info != NULL);
|
||
thread_info->private->dying = 1;
|
||
}
|
||
|
||
static void
|
||
thread_db_detach (char *args, int from_tty)
|
||
{
|
||
disable_thread_event_reporting ();
|
||
|
||
/* There's no need to save & restore inferior_ptid here, since the
|
||
inferior is supposed to be survive this function call. */
|
||
inferior_ptid = lwp_from_thread (inferior_ptid);
|
||
|
||
/* Forget about the child's process ID. We shouldn't need it
|
||
anymore. */
|
||
proc_handle.pid = 0;
|
||
|
||
target_beneath->to_detach (args, from_tty);
|
||
}
|
||
|
||
static int
|
||
clear_lwpid_callback (struct thread_info *thread, void *dummy)
|
||
{
|
||
/* If we know that our thread implementation is 1-to-1, we could save
|
||
a certain amount of information; it's not clear how much, so we
|
||
are always conservative. */
|
||
|
||
thread->private->th_valid = 0;
|
||
thread->private->ti_valid = 0;
|
||
|
||
return 0;
|
||
}
|
||
|
||
static void
|
||
thread_db_resume (ptid_t ptid, int step, enum target_signal signo)
|
||
{
|
||
struct cleanup *old_chain = save_inferior_ptid ();
|
||
|
||
if (GET_PID (ptid) == -1)
|
||
inferior_ptid = lwp_from_thread (inferior_ptid);
|
||
else if (is_thread (ptid))
|
||
ptid = lwp_from_thread (ptid);
|
||
|
||
/* Clear cached data which may not be valid after the resume. */
|
||
iterate_over_threads (clear_lwpid_callback, NULL);
|
||
|
||
target_beneath->to_resume (ptid, step, signo);
|
||
|
||
do_cleanups (old_chain);
|
||
}
|
||
|
||
/* Check if PID is currently stopped at the location of a thread event
|
||
breakpoint location. If it is, read the event message and act upon
|
||
the event. */
|
||
|
||
static void
|
||
check_event (ptid_t ptid)
|
||
{
|
||
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 = read_pc_pid (ptid) - DECR_PC_AFTER_BREAK;
|
||
if (stop_pc != td_create_bp_addr && stop_pc != td_death_bp_addr)
|
||
return;
|
||
|
||
/* If we are at a create breakpoint, we do not know what new lwp
|
||
was created and cannot specifically locate the event message for it.
|
||
We have to call td_ta_event_getmsg() to get
|
||
the latest message. Since we have no way of correlating whether
|
||
the event message we get back corresponds to our breakpoint, we must
|
||
loop and read all event messages, processing them appropriately.
|
||
This guarantees we will process the correct message before continuing
|
||
from the breakpoint.
|
||
|
||
Currently, death events are not enabled. If they are enabled,
|
||
the death event can use the td_thr_event_getmsg() interface to
|
||
get the message specifically for that lwp and avoid looping
|
||
below. */
|
||
|
||
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 (msg.th_p, &ti);
|
||
if (err != TD_OK)
|
||
error (_("Cannot get thread info: %s"), thread_db_err_str (err));
|
||
|
||
ptid = ptid_build (GET_PID (ptid), ti.ti_lid, ti.ti_tid);
|
||
|
||
switch (msg.event)
|
||
{
|
||
case TD_CREATE:
|
||
/* Call attach_thread whether or not we already know about a
|
||
thread with this thread ID. */
|
||
attach_thread (ptid, 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
|
||
thread_db_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
|
||
{
|
||
extern ptid_t trap_ptid;
|
||
|
||
if (GET_PID (ptid) != -1 && is_thread (ptid))
|
||
ptid = lwp_from_thread (ptid);
|
||
|
||
ptid = target_beneath->to_wait (ptid, ourstatus);
|
||
|
||
if (proc_handle.pid == 0)
|
||
/* The current child process isn't the actual multi-threaded
|
||
program yet, so don't try to do any special thread-specific
|
||
post-processing and bail out early. */
|
||
return ptid;
|
||
|
||
if (ourstatus->kind == TARGET_WAITKIND_EXITED)
|
||
return pid_to_ptid (-1);
|
||
|
||
if (ourstatus->kind == TARGET_WAITKIND_STOPPED
|
||
&& ourstatus->value.sig == TARGET_SIGNAL_TRAP)
|
||
/* Check for a thread event. */
|
||
check_event (ptid);
|
||
|
||
if (!ptid_equal (trap_ptid, null_ptid))
|
||
trap_ptid = thread_from_lwp (trap_ptid);
|
||
|
||
/* Change the ptid back into the higher level PID + TID format.
|
||
If the thread is dead and no longer on the thread list, we will
|
||
get back a dead ptid. This can occur if the thread death event
|
||
gets postponed by other simultaneous events. In such a case,
|
||
we want to just ignore the event and continue on. */
|
||
ptid = thread_from_lwp (ptid);
|
||
if (GET_PID (ptid) == -1)
|
||
ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
|
||
|
||
return ptid;
|
||
}
|
||
|
||
static LONGEST
|
||
thread_db_xfer_partial (struct target_ops *ops, enum target_object object,
|
||
const char *annex, gdb_byte *readbuf,
|
||
const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
|
||
{
|
||
struct cleanup *old_chain = save_inferior_ptid ();
|
||
LONGEST xfer;
|
||
|
||
if (is_thread (inferior_ptid))
|
||
{
|
||
/* FIXME: This seems to be necessary to make sure breakpoints
|
||
are removed. */
|
||
if (!target_thread_alive (inferior_ptid))
|
||
inferior_ptid = pid_to_ptid (GET_PID (inferior_ptid));
|
||
else
|
||
inferior_ptid = lwp_from_thread (inferior_ptid);
|
||
}
|
||
|
||
xfer = target_beneath->to_xfer_partial (ops, object, annex,
|
||
readbuf, writebuf, offset, len);
|
||
|
||
do_cleanups (old_chain);
|
||
return xfer;
|
||
}
|
||
|
||
static void
|
||
thread_db_fetch_registers (int regno)
|
||
{
|
||
struct thread_info *thread_info;
|
||
prgregset_t gregset;
|
||
gdb_prfpregset_t fpregset;
|
||
td_err_e err;
|
||
|
||
if (!is_thread (inferior_ptid))
|
||
{
|
||
/* Pass the request to the target beneath us. */
|
||
target_beneath->to_fetch_registers (regno);
|
||
return;
|
||
}
|
||
|
||
thread_info = find_thread_pid (inferior_ptid);
|
||
thread_db_map_id2thr (thread_info, 1);
|
||
|
||
err = td_thr_getgregs_p (&thread_info->private->th, gregset);
|
||
if (err != TD_OK)
|
||
error (_("Cannot fetch general-purpose registers for thread %ld: %s"),
|
||
(long) GET_THREAD (inferior_ptid), thread_db_err_str (err));
|
||
|
||
err = td_thr_getfpregs_p (&thread_info->private->th, &fpregset);
|
||
if (err != TD_OK)
|
||
error (_("Cannot get floating-point registers for thread %ld: %s"),
|
||
(long) GET_THREAD (inferior_ptid), thread_db_err_str (err));
|
||
|
||
/* Note that we must call supply_gregset after calling the thread_db
|
||
routines because the thread_db routines call ps_lgetgregs and
|
||
friends which clobber GDB's register cache. */
|
||
supply_gregset ((gdb_gregset_t *) gregset);
|
||
supply_fpregset (&fpregset);
|
||
}
|
||
|
||
static void
|
||
thread_db_store_registers (int regno)
|
||
{
|
||
prgregset_t gregset;
|
||
gdb_prfpregset_t fpregset;
|
||
td_err_e err;
|
||
struct thread_info *thread_info;
|
||
|
||
if (!is_thread (inferior_ptid))
|
||
{
|
||
/* Pass the request to the target beneath us. */
|
||
target_beneath->to_store_registers (regno);
|
||
return;
|
||
}
|
||
|
||
thread_info = find_thread_pid (inferior_ptid);
|
||
thread_db_map_id2thr (thread_info, 1);
|
||
|
||
if (regno != -1)
|
||
{
|
||
char raw[MAX_REGISTER_SIZE];
|
||
|
||
deprecated_read_register_gen (regno, raw);
|
||
thread_db_fetch_registers (-1);
|
||
regcache_raw_supply (current_regcache, regno, raw);
|
||
}
|
||
|
||
fill_gregset ((gdb_gregset_t *) gregset, -1);
|
||
fill_fpregset (&fpregset, -1);
|
||
|
||
err = td_thr_setgregs_p (&thread_info->private->th, gregset);
|
||
if (err != TD_OK)
|
||
error (_("Cannot store general-purpose registers for thread %ld: %s"),
|
||
(long) GET_THREAD (inferior_ptid), thread_db_err_str (err));
|
||
err = td_thr_setfpregs_p (&thread_info->private->th, &fpregset);
|
||
if (err != TD_OK)
|
||
error (_("Cannot store floating-point registers for thread %ld: %s"),
|
||
(long) GET_THREAD (inferior_ptid), thread_db_err_str (err));
|
||
}
|
||
|
||
static void
|
||
thread_db_kill (void)
|
||
{
|
||
/* There's no need to save & restore inferior_ptid here, since the
|
||
inferior isn't supposed to survive this function call. */
|
||
inferior_ptid = lwp_from_thread (inferior_ptid);
|
||
target_beneath->to_kill ();
|
||
}
|
||
|
||
static void
|
||
thread_db_create_inferior (char *exec_file, char *allargs, char **env,
|
||
int from_tty)
|
||
{
|
||
unpush_target (&thread_db_ops);
|
||
using_thread_db = 0;
|
||
target_beneath->to_create_inferior (exec_file, allargs, env, from_tty);
|
||
}
|
||
|
||
static void
|
||
thread_db_post_startup_inferior (ptid_t ptid)
|
||
{
|
||
if (proc_handle.pid == 0)
|
||
{
|
||
/* The child process is now the actual multi-threaded
|
||
program. Snatch its process ID... */
|
||
proc_handle.pid = GET_PID (ptid);
|
||
|
||
/* ...and perform the remaining initialization steps. */
|
||
enable_thread_event_reporting ();
|
||
thread_db_find_new_threads ();
|
||
}
|
||
}
|
||
|
||
static void
|
||
thread_db_mourn_inferior (void)
|
||
{
|
||
remove_thread_event_breakpoints ();
|
||
|
||
/* Forget about the child's process ID. We shouldn't need it
|
||
anymore. */
|
||
proc_handle.pid = 0;
|
||
|
||
target_beneath->to_mourn_inferior ();
|
||
|
||
/* Detach thread_db target ops. */
|
||
unpush_target (&thread_db_ops);
|
||
using_thread_db = 0;
|
||
}
|
||
|
||
static int
|
||
thread_db_thread_alive (ptid_t ptid)
|
||
{
|
||
td_thrhandle_t th;
|
||
td_err_e err;
|
||
|
||
if (is_thread (ptid))
|
||
{
|
||
struct thread_info *thread_info;
|
||
thread_info = find_thread_pid (ptid);
|
||
|
||
thread_db_map_id2thr (thread_info, 0);
|
||
if (!thread_info->private->th_valid)
|
||
return 0;
|
||
|
||
err = td_thr_validate_p (&thread_info->private->th);
|
||
if (err != TD_OK)
|
||
return 0;
|
||
|
||
if (!thread_info->private->ti_valid)
|
||
{
|
||
err =
|
||
td_thr_get_info_p (&thread_info->private->th,
|
||
&thread_info->private->ti);
|
||
if (err != TD_OK)
|
||
return 0;
|
||
thread_info->private->ti_valid = 1;
|
||
}
|
||
|
||
if (thread_info->private->ti.ti_state == TD_THR_UNKNOWN
|
||
|| thread_info->private->ti.ti_state == TD_THR_ZOMBIE)
|
||
return 0; /* A zombie thread. */
|
||
|
||
return 1;
|
||
}
|
||
|
||
if (target_beneath->to_thread_alive)
|
||
return target_beneath->to_thread_alive (ptid);
|
||
|
||
return 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 (_("find_new_threads_callback: cannot get thread info: %s"),
|
||
thread_db_err_str (err));
|
||
|
||
if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE)
|
||
return 0; /* A zombie -- ignore. */
|
||
|
||
ptid = ptid_build (GET_PID (inferior_ptid), ti.ti_lid, ti.ti_tid);
|
||
|
||
if (!in_thread_list (ptid))
|
||
attach_thread (ptid, th_p, &ti, 1);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static void
|
||
thread_db_find_new_threads (void)
|
||
{
|
||
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 *
|
||
thread_db_pid_to_str (ptid_t ptid)
|
||
{
|
||
if (is_thread (ptid))
|
||
{
|
||
static char buf[64];
|
||
td_thrinfo_t *ti_p;
|
||
td_err_e err;
|
||
struct thread_info *thread_info;
|
||
|
||
thread_info = find_thread_pid (ptid);
|
||
thread_db_map_id2thr (thread_info, 0);
|
||
if (!thread_info->private->th_valid)
|
||
{
|
||
snprintf (buf, sizeof (buf), "Thread %ld (Missing)",
|
||
GET_THREAD (ptid));
|
||
return buf;
|
||
}
|
||
|
||
ti_p = thread_db_get_info (thread_info);
|
||
|
||
if (ti_p->ti_state == TD_THR_ACTIVE && ti_p->ti_lid != 0)
|
||
{
|
||
snprintf (buf, sizeof (buf), "Thread %ld (LWP %d)",
|
||
(long) ti_p->ti_tid, ti_p->ti_lid);
|
||
}
|
||
else
|
||
{
|
||
snprintf (buf, sizeof (buf), "Thread %ld (%s)",
|
||
(long) ti_p->ti_tid,
|
||
thread_db_state_str (ti_p->ti_state));
|
||
}
|
||
|
||
return buf;
|
||
}
|
||
|
||
if (target_beneath->to_pid_to_str (ptid))
|
||
return target_beneath->to_pid_to_str (ptid);
|
||
|
||
return normal_pid_to_str (ptid);
|
||
}
|
||
|
||
/* Get the address of the thread local variable in load module LM which
|
||
is stored at OFFSET within the thread local storage for thread PTID. */
|
||
|
||
static CORE_ADDR
|
||
thread_db_get_thread_local_address (ptid_t ptid,
|
||
CORE_ADDR lm,
|
||
CORE_ADDR offset)
|
||
{
|
||
if (is_thread (ptid))
|
||
{
|
||
td_err_e err;
|
||
void *address;
|
||
struct thread_info *thread_info;
|
||
|
||
/* glibc doesn't provide the needed interface. */
|
||
if (!td_thr_tls_get_addr_p)
|
||
throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR,
|
||
_("No TLS library support"));
|
||
|
||
/* Caller should have verified that lm != 0. */
|
||
gdb_assert (lm != 0);
|
||
|
||
/* Get info about the thread. */
|
||
thread_info = find_thread_pid (ptid);
|
||
thread_db_map_id2thr (thread_info, 1);
|
||
|
||
/* Finally, get the address of the variable. */
|
||
err = td_thr_tls_get_addr_p (&thread_info->private->th, (void *) lm,
|
||
offset, &address);
|
||
|
||
#ifdef THREAD_DB_HAS_TD_NOTALLOC
|
||
/* The memory hasn't been allocated, yet. */
|
||
if (err == TD_NOTALLOC)
|
||
/* Now, if libthread_db provided the initialization image's
|
||
address, we *could* try to build a non-lvalue value from
|
||
the initialization image. */
|
||
throw_error (TLS_NOT_ALLOCATED_YET_ERROR,
|
||
_("TLS not allocated yet"));
|
||
#endif
|
||
|
||
/* Something else went wrong. */
|
||
if (err != TD_OK)
|
||
throw_error (TLS_GENERIC_ERROR,
|
||
(("%s")), thread_db_err_str (err));
|
||
|
||
/* Cast assuming host == target. Joy. */
|
||
return (CORE_ADDR) address;
|
||
}
|
||
|
||
if (target_beneath->to_get_thread_local_address)
|
||
return target_beneath->to_get_thread_local_address (ptid, lm, offset);
|
||
else
|
||
throw_error (TLS_GENERIC_ERROR,
|
||
_("TLS not supported on this target"));
|
||
}
|
||
|
||
static void
|
||
init_thread_db_ops (void)
|
||
{
|
||
thread_db_ops.to_shortname = "multi-thread";
|
||
thread_db_ops.to_longname = "multi-threaded child process.";
|
||
thread_db_ops.to_doc = "Threads and pthreads support.";
|
||
thread_db_ops.to_attach = thread_db_attach;
|
||
thread_db_ops.to_detach = thread_db_detach;
|
||
thread_db_ops.to_resume = thread_db_resume;
|
||
thread_db_ops.to_wait = thread_db_wait;
|
||
thread_db_ops.to_fetch_registers = thread_db_fetch_registers;
|
||
thread_db_ops.to_store_registers = thread_db_store_registers;
|
||
thread_db_ops.to_xfer_partial = thread_db_xfer_partial;
|
||
thread_db_ops.to_kill = thread_db_kill;
|
||
thread_db_ops.to_create_inferior = thread_db_create_inferior;
|
||
thread_db_ops.to_post_startup_inferior = thread_db_post_startup_inferior;
|
||
thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior;
|
||
thread_db_ops.to_thread_alive = thread_db_thread_alive;
|
||
thread_db_ops.to_find_new_threads = thread_db_find_new_threads;
|
||
thread_db_ops.to_pid_to_str = thread_db_pid_to_str;
|
||
thread_db_ops.to_stratum = thread_stratum;
|
||
thread_db_ops.to_has_thread_control = tc_schedlock;
|
||
thread_db_ops.to_get_thread_local_address
|
||
= thread_db_get_thread_local_address;
|
||
thread_db_ops.to_magic = OPS_MAGIC;
|
||
}
|
||
|
||
void
|
||
_initialize_thread_db (void)
|
||
{
|
||
/* Only initialize the module if we can load libthread_db. */
|
||
if (thread_db_load ())
|
||
{
|
||
init_thread_db_ops ();
|
||
add_target (&thread_db_ops);
|
||
|
||
/* Add ourselves to objfile event chain. */
|
||
target_new_objfile_chain = deprecated_target_new_objfile_hook;
|
||
deprecated_target_new_objfile_hook = thread_db_new_objfile;
|
||
}
|
||
}
|