* 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, 41 insertions, 19 deletions

diff --git a/gdb/amd64-linux-nat.c b/gdb/amd64-linux-nat.c
index 9e9e30f..e7643ac 100644
--- a/gdb/amd64-linux-nat.c
+++ b/gdb/amd64-linux-nat.c
@@ -233,25 +233,27 @@ amd64_linux_store_inferior_registers (struct regcache *regcache, int regnum)
     }
 }
 
+/* Support for debug registers.  */
+
+static unsigned long amd64_linux_dr[DR_CONTROL + 1];
 
 static unsigned long
-amd64_linux_dr_get (int regnum)
+amd64_linux_dr_get (ptid_t ptid, int regnum)
 {
   int tid;
   unsigned long value;
 
-  /* FIXME: kettenis/2001-01-29: It's not clear what we should do with
-     multi-threaded processes here.  For now, pretend there is just
-     one thread.  */
-  tid = PIDGET (inferior_ptid);
+  tid = TIDGET (ptid);
+  if (tid == 0)
+    tid = PIDGET (ptid);
 
   /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the
      ptrace call fails breaks debugging remote targets.  The correct
      way to fix this is to add the hardware breakpoint and watchpoint
-     stuff to the target vectore.  For now, just return zero if the
+     stuff to the target vector.  For now, just return zero if the
      ptrace call fails.  */
   errno = 0;
-  value = ptrace (PT_READ_U, tid,
+  value = ptrace (PTRACE_PEEKUSER, tid,
 		  offsetof (struct user, u_debugreg[regnum]), 0);
   if (errno != 0)
 #if 0
@@ -264,17 +266,17 @@ amd64_linux_dr_get (int regnum)
 }
 
 static void
-amd64_linux_dr_set (int regnum, unsigned long value)
+amd64_linux_dr_set (ptid_t ptid, int regnum, unsigned long value)
 {
   int tid;
 
-  /* FIXME: kettenis/2001-01-29: It's not clear what we should do with
-     multi-threaded processes here.  For now, pretend there is just
-     one thread.  */
-  tid = PIDGET (inferior_ptid);
+  tid = TIDGET (ptid);
+  if (tid == 0)
+    tid = PIDGET (ptid);
 
   errno = 0;
-  ptrace (PT_WRITE_U, tid, offsetof (struct user, u_debugreg[regnum]), value);
+  ptrace (PTRACE_POKEUSER, tid,
+	  offsetof (struct user, u_debugreg[regnum]), value);
   if (errno != 0)
     perror_with_name (_("Couldn't write debug register"));
 }
@@ -282,29 +284,48 @@ amd64_linux_dr_set (int regnum, unsigned long value)
 void
 amd64_linux_dr_set_control (unsigned long control)
 {
-  amd64_linux_dr_set (DR_CONTROL, control);
+  struct lwp_info *lp;
+  ptid_t ptid;
+
+  amd64_linux_dr[DR_CONTROL] = control;
+  ALL_LWPS (lp, ptid)
+    amd64_linux_dr_set (ptid, DR_CONTROL, control);
 }
 
 void
 amd64_linux_dr_set_addr (int regnum, CORE_ADDR addr)
 {
+  struct lwp_info *lp;
+  ptid_t ptid;
+
   gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
 
-  amd64_linux_dr_set (DR_FIRSTADDR + regnum, addr);
+  amd64_linux_dr[DR_FIRSTADDR + regnum] = addr;
+  ALL_LWPS (lp, ptid)
+    amd64_linux_dr_set (ptid, DR_FIRSTADDR + regnum, addr);
 }
 
 void
 amd64_linux_dr_reset_addr (int regnum)
 {
-  gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
-
-  amd64_linux_dr_set (DR_FIRSTADDR + regnum, 0L);
+  amd64_linux_dr_set_addr (regnum, 0);
 }
 
 unsigned long
 amd64_linux_dr_get_status (void)
 {
-  return amd64_linux_dr_get (DR_STATUS);
+  return amd64_linux_dr_get (inferior_ptid, DR_STATUS);
+}
+
+static void
+amd64_linux_new_thread (ptid_t ptid)
+{
+  int i;
+
+  for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
+    amd64_linux_dr_set (ptid, i, amd64_linux_dr[i]);
+
+  amd64_linux_dr_set (ptid, DR_CONTROL, amd64_linux_dr[DR_CONTROL]);
 }
 
 
@@ -408,4 +429,5 @@ _initialize_amd64_linux_nat (void)
 
   /* Register the target.  */
   linux_nat_add_target (t);
+  linux_nat_set_new_thread (t, amd64_linux_new_thread);
 }