* linux-nat.c (linux_nat_new_thread): New variable.

	(linux_child_follow_fork): Set inferior_ptid to include LWP ID.  Use
	linux_nat_switch_fork.
	(lwp_list): Make public.
	(add_lwp): Call linux_nat_new_thread.
	(lin_lwp_attach_lwp, linux_nat_attach): Call add_lwp after stopping
	the new thread.
	(resume_callback): Clear lp->siginfo.  Remove unused variable.
	(linux_nat_resume): Assert that the LWP list is already initialized.
	Clear lp->siginfo.
	(save_siginfo): New.
	(stop_wait_callback, linux_nat_wait): Call it.
	(linux_nat_set_new_thread, linux_nat_get_siginfo): New.
	* linux-nat.h (struct lwp_info): Add siginfo.
	(lwp_list, linux_nat_set_new_thread, linux_nat_get_siginfo): Declare.
	(ALL_LWPS): Define.

	* amd64-linux-nat.c (amd64_linux_dr): New.
	(amd64_linux_dr_get): Take a PTID argument.  Correct typo.
	(amd64_linux_dr_set): Take a PTID argument.
	(amd64_linux_dr_set_control, amd64_linux_dr_set_addr): Use ALL_LWPS.
	(amd64_linux_dr_reset_addr): Use amd64_linux_dr_set_addr.
	(amd64_linux_dr_get_status): Pass inferior_ptid to amd64_linux_dr_get.
	(amd64_linux_new_thread): New.
	(_initialize_amd64_linux_nat): Call linux_nat_set_new_thread.
	* i386-linux-nat.c (i386_linux_dr): New.
	(i386_linux_dr_get, i386_linux_dr_set): Take a PTID argument.
	(i386_linux_dr_set_control, i386_linux_dr_set_addr): Use ALL_LWPS.
	(i386_linux_dr_reset_addr): Use i386_linux_dr_set_addr.
	(i386_linux_dr_get_status): Pass inferior_ptid to i386_linux_dr_get.
	(i386_linux_new_thread): New.
	(i386_linux_resume): Remove unnecessary PID check.
	(_initialize_i386_linux_nat): Call linux_nat_set_new_thread.
	* ia64-linux-nat.c (enable_watchpoints_in_psr): Take PTID argument.
	(fetch_debug_register, fetch_debug_register_pair): Delete.
	(debug_registers): New.
	(ia64_linux_insert_watchpoint, ia64_linux_remove_watchpoint): Use
	ALL_LWPS and debug_registers.
	(ia64_linux_new_thread): New.
	(ia64_linux_stopped_data_address): Use linux_nat_get_siginfo.
	(_initialize_ia64_linux_nat): Call linux_nat_set_new_thread.
	* ppc-linux-nat.c (last_stopped_data_address): Delete.
	(saved_dabr_value): New.
	(ppc_linux_insert_watchpoint, ppc_linux_remove_watchpoint): Use
	ALL_LWPS.
	(ppc_linux_new_thread): New.
	(ppc_linux_stopped_data_address): Use linux_nat_get_siginfo.
	(ppc_linux_stopped_by_watchpoint): Call ppc_linux_stopped_data_address.
	(_initialize_ppc_linux_nat): Call linux_nat_set_new_thread.
	* s390-nat.c (s390_stopped_by_watchpoint): Clear the watchpoint status
	after reading it.
	(s390_fix_watch_points): Take a PTID argument.
	(s390_insert_watchpoint, s390_remove_watchpoint): Use ALL_LWPS.
	(_initialize_s390_nat): Call linux_nat_set_new_thread.

1 files changed, 27 insertions, 1 deletions

diff --git a/gdb/linux-nat.h b/gdb/linux-nat.h
index 82cf51b..43686cf 100644
--- a/gdb/linux-nat.h
+++ b/gdb/linux-nat.h
@@ -20,7 +20,11 @@
 
 #include "target.h"
 
-/* Structure describing an LWP.  */
+#include <signal.h>
+
+/* Structure describing an LWP.  This is public only for the purposes
+   of ALL_LWPS; target-specific code should generally not access it
+   directly.  */
 
 struct lwp_info
 {
@@ -54,6 +58,10 @@ struct lwp_info
   /* Non-zero if we were stepping this LWP.  */
   int step;
 
+  /* Non-zero si_signo if this LWP stopped with a trap.  si_addr may
+     be the address of a hardware watchpoint.  */
+  struct siginfo siginfo;
+
   /* If WAITSTATUS->KIND != TARGET_WAITKIND_SPURIOUS, the waitstatus
      for this LWP's last event.  This may correspond to STATUS above,
      or to a local variable in lin_lwp_wait.  */
@@ -63,6 +71,18 @@ struct lwp_info
   struct lwp_info *next;
 };
 
+/* The global list of LWPs, for ALL_LWPS.  Unlike the threads list,
+   there is always at least one LWP on the list while the GNU/Linux
+   native target is active.  */
+extern struct lwp_info *lwp_list;
+
+/* Iterate over the PTID each active thread (light-weight process).  There
+   must be at least one.  */
+#define ALL_LWPS(LP, PTID)						\
+  for ((LP) = lwp_list, (PTID) = (LP)->ptid;				\
+       (LP) != NULL;							\
+       (LP) = (LP)->next, (PTID) = (LP) ? (LP)->ptid : (PTID))
+
 /* Attempt to initialize libthread_db.  */
 void check_for_thread_db (void);
 
@@ -95,6 +115,12 @@ linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int));
    instead of calling add_target directly.  */
 void linux_nat_add_target (struct target_ops *);
 
+/* Register a method to call whenever a new thread is attached.  */
+void linux_nat_set_new_thread (struct target_ops *, void (*) (ptid_t));
+
 /* Update linux-nat internal state when changing from one fork
    to another.  */
 void linux_nat_switch_fork (ptid_t new_ptid);
+
+/* Return the saved siginfo associated with PTID.  */
+struct siginfo *linux_nat_get_siginfo (ptid_t ptid);