New gdbarch methods breakpoint_kind_from_pc and sw_breakpoint_from_kind

This patch adds two gdbarch methods breakpoint_kind_from_pc and
sw_breakpoint_from_kind, and uses target_info.placed_size as "kind"
of the breakpoint.  This patch updates the usages of
target_info.placed_size.

The "kind" of a breakpoint is determined by gdbarch rather than
target, so we have gdbarch method breakpoint_kind_from_pc, and we
should set target_info.placed_size out of each implementation of
target to_insert_breakpoint.  In this way, each target doesn't have
to set target_info.placed_size any more.

This patch also sets target_info.placed_address before
target_insert_breakpoint too, so that target to_insert_breakpoint
can use it, see record_full_insert_breakpoint.

Before we call target_insert_breakpoint, we set
target_info.placed_address and target_info.placed_size like this,

      CORE_ADDR addr = bl->target_info.reqstd_address;

      bl->target_info.placed_size = gdbarch_breakpoint_kind_from_pc (bl->gdbarch, &addr);
      bl->target_info.placed_address = addr;

      return target_insert_breakpoint (bl->gdbarch, &bl->target_info);

target_insert_breakpoint may fail, but it doesn't matter to the "kind"
and "placed_address" of a breakpoint.  They should be determined by
gdbarch.

gdb:

2016-11-03  Yao Qi  <yao.qi@linaro.org>

	* arch-utils.h (GDBARCH_BREAKPOINT_MANIPULATION): Define
	breakpoint_kind_from_pc and sw_breakpoint_from_kind.
	(GDBARCH_BREAKPOINT_MANIPULATION_ENDIAN): Likewise.
	(SET_GDBARCH_BREAKPOINT_MANIPULATION): Call
	set_gdbarch_breakpoint_kind_from_pc and
	set_gdbarch_sw_breakpoint_from_kind.
	* arm-tdep.c: Add comments.
	* bfin-tdep.c: Likewise.
	* breakpoint.c (breakpoint_kind): New function.
	(insert_bp_location): Set target_info.placed_size and
	target_info.placed_address.
	(bkpt_insert_location): Likewise.
	* cris-tdep.c: Add comments.
	* gdbarch.sh (breakpoint_kind_from_pc): New.
	(sw_breakpoint_from_kind): New.
	* gdbarch.c, gdbarch.h: Regenerated.
	* ia64-tdep.c (ia64_memory_insert_breakpoint): Don't set
	bp_tgt->placed_size.
	(ia64_memory_remove_breakpoint): Don't assert
	bp_tgt->placed_size.
	(ia64_breakpoint_kind_from_pc): New function.
	(ia64_gdbarch_init): Install ia64_breakpoint_kind_from_pc.
	* m32r-tdep.c (m32r_memory_insert_breakpoint): Don't set
	bp_tgt->placed_size.
	* mem-break.c (default_memory_insert_breakpoint): Don't set
	bp_tgt->placed_size.  Call gdbarch_sw_breakpoint_from_kind.
	(default_memory_remove_breakpoint): Call
	gdbarch_sw_breakpoint_from_kind.
	(memory_validate_breakpoint): Don't check bp_tgt->placed_size.
	* mips-tdep.c: Add comments.
	* mt-tdep.c: Likewise.
	* nios2-tdep.c: Likewise.
	* record-full.c (record_full_insert_breakpoint): Don't call
	gdbarch_breakpoint_from_pc.  Don't set bp_tgt->placed_address
	and bp_tgt->placed_size.
	* remote.c (remote_insert_breakpoint): Don't call
	gdbarch_remote_breakpoint_from_pc.  Use bp_tgt->placed_size.
	Don't set bp_tgt->placed_address and bp_tgt->placed_size.
	(remote_insert_hw_breakpoint): Likewise.
	* score-tdep.c: Likewise.
	* sh-tdep.c: Likewise.
	* tic6x-tdep.c: Likewise.
	* v850-tdep.c: Likewise.
	* xtensa-tdep.c: Likewise.

gdb/ChangeLog

@@ -1,3 +1,50 @@
+2016-11-03  Yao Qi  <yao.qi@linaro.org>
+
+	* arch-utils.h (GDBARCH_BREAKPOINT_MANIPULATION): Define
+	breakpoint_kind_from_pc and sw_breakpoint_from_kind.
+	(GDBARCH_BREAKPOINT_MANIPULATION_ENDIAN): Likewise.
+	(SET_GDBARCH_BREAKPOINT_MANIPULATION): Call
+	set_gdbarch_breakpoint_kind_from_pc and
+	set_gdbarch_sw_breakpoint_from_kind.
+	* arm-tdep.c: Add comments.
+	* bfin-tdep.c: Likewise.
+	* breakpoint.c (breakpoint_kind): New function.
+	(insert_bp_location): Set target_info.placed_size and
+	target_info.placed_address.
+	(bkpt_insert_location): Likewise.
+	* cris-tdep.c: Add comments.
+	* gdbarch.sh (breakpoint_kind_from_pc): New.
+	(sw_breakpoint_from_kind): New.
+	* gdbarch.c, gdbarch.h: Regenerated.
+	* ia64-tdep.c (ia64_memory_insert_breakpoint): Don't set
+	bp_tgt->placed_size.
+	(ia64_memory_remove_breakpoint): Don't assert
+	bp_tgt->placed_size.
+	(ia64_breakpoint_kind_from_pc): New function.
+	(ia64_gdbarch_init): Install ia64_breakpoint_kind_from_pc.
+	* m32r-tdep.c (m32r_memory_insert_breakpoint): Don't set
+	bp_tgt->placed_size.
+	* mem-break.c (default_memory_insert_breakpoint): Don't set
+	bp_tgt->placed_size.  Call gdbarch_sw_breakpoint_from_kind.
+	(default_memory_remove_breakpoint): Call
+	gdbarch_sw_breakpoint_from_kind.
+	(memory_validate_breakpoint): Don't check bp_tgt->placed_size.
+	* mips-tdep.c: Add comments.
+	* mt-tdep.c: Likewise.
+	* nios2-tdep.c: Likewise.
+	* record-full.c (record_full_insert_breakpoint): Don't call
+	gdbarch_breakpoint_from_pc.  Don't set bp_tgt->placed_address
+	and bp_tgt->placed_size.
+	* remote.c (remote_insert_breakpoint): Don't call
+	gdbarch_remote_breakpoint_from_pc.  Use bp_tgt->placed_size.
+	Don't set bp_tgt->placed_address and bp_tgt->placed_size.
+	(remote_insert_hw_breakpoint): Likewise.
+	* score-tdep.c: Likewise.
+	* sh-tdep.c: Likewise.
+	* tic6x-tdep.c: Likewise.
+	* v850-tdep.c: Likewise.
+	* xtensa-tdep.c: Likewise.
+
 2016-11-03  Yao Qi  <yao.qi@linaro.org>
 
 	* arch-utils.h (GDBARCH_BREAKPOINT_FROM_PC): New macro.

gdb/arch-utils.h

@@ -38,34 +38,50 @@ struct gdbarch_info;
   }
 
 #define GDBARCH_BREAKPOINT_MANIPULATION(ARCH,BREAK_INSN)	      \
+  static int							      \
+  ARCH##_breakpoint_kind_from_pc (struct gdbarch *gdbarch,	      \
+				  CORE_ADDR *pcptr)		      \
+  {								      \
+    return sizeof (BREAK_INSN);				      \
+  }								      \
   static const gdb_byte *					      \
-  ARCH##_breakpoint_from_pc (struct gdbarch *gdbarch,		      \
-			     CORE_ADDR *pcptr,			      \
-			     int *lenptr)			      \
+  ARCH##_sw_breakpoint_from_kind (struct gdbarch *gdbarch,	      \
+				  int kind, int *size)		      \
   {								      \
-    *lenptr = sizeof (BREAK_INSN);				      \
+    *size = kind;						      \
     return BREAK_INSN;						      \
-  }
+  }								      \
+  GDBARCH_BREAKPOINT_FROM_PC (ARCH)
 
-#define SET_GDBARCH_BREAKPOINT_MANIPULATION(ARCH)	\
-  set_gdbarch_breakpoint_from_pc (gdbarch, ARCH##_breakpoint_from_pc)
+#define SET_GDBARCH_BREAKPOINT_MANIPULATION(ARCH)			\
+  set_gdbarch_breakpoint_from_pc (gdbarch, ARCH##_breakpoint_from_pc);	\
+  set_gdbarch_breakpoint_kind_from_pc (gdbarch,			\
+				       ARCH##_breakpoint_kind_from_pc); \
+  set_gdbarch_sw_breakpoint_from_kind (gdbarch,			\
+				       ARCH##_sw_breakpoint_from_kind)
 
 #define GDBARCH_BREAKPOINT_MANIPULATION_ENDIAN(ARCH, \
 					       LITTLE_BREAK_INSN,	\
 					       BIG_BREAK_INSN)		\
-  static const gdb_byte *						\
-  ARCH##_breakpoint_from_pc (struct gdbarch *gdbarch,			\
-			     CORE_ADDR *pcptr,				\
-			     int *lenptr)				\
+  static int								\
+  ARCH##_breakpoint_kind_from_pc (struct gdbarch *gdbarch,		\
+				  CORE_ADDR *pcptr)			\
   {									\
     gdb_static_assert (ARRAY_SIZE (LITTLE_BREAK_INSN)			\
 		       == ARRAY_SIZE (BIG_BREAK_INSN));		\
-    *lenptr = sizeof (LITTLE_BREAK_INSN);				\
-    if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)		\
-      return BIG_BREAK_INSN;						\
-    else								\
-      return LITTLE_BREAK_INSN;					\
-  }
+    return sizeof (BIG_BREAK_INSN);					\
+  }									\
+  static const gdb_byte *					      \
+  ARCH##_sw_breakpoint_from_kind (struct gdbarch *gdbarch,	      \
+				  int kind, int *size)		      \
+  {								      \
+    *size = kind;						      \
+    if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)	      \
+      return BIG_BREAK_INSN;					      \
+    else							      \
+      return LITTLE_BREAK_INSN;				      \
+  }								      \
+  GDBARCH_BREAKPOINT_FROM_PC (ARCH)
 
 /* An implementation of gdbarch_displaced_step_copy_insn for
    processors that don't need to modify the instruction before

gdb/arm-tdep.c

@@ -7843,6 +7843,8 @@ static const gdb_byte arm_default_arm_be_breakpoint[] = ARM_BE_BREAKPOINT;
 static const gdb_byte arm_default_thumb_le_breakpoint[] = THUMB_LE_BREAKPOINT;
 static const gdb_byte arm_default_thumb_be_breakpoint[] = THUMB_BE_BREAKPOINT;
 
+/* Implement the breakpoint_kind_from_pc gdbarch method.  */
+
 static int
 arm_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr)
 {
@@ -7876,6 +7878,8 @@ arm_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr)
 
 }
 
+/* Implement the sw_breakpoint_from_kind gdbarch method.  */
+
 static const gdb_byte *
 arm_sw_breakpoint_from_kind (struct gdbarch *gdbarch, int kind, int *size)
 {

gdb/bfin-tdep.c

@@ -568,6 +568,8 @@ bfin_reg_to_regnum (struct gdbarch *gdbarch, int reg)
   return map_gcc_gdb[reg];
 }
 
+/* Implement the breakpoint_kind_from_pc gdbarch method.  */
+
 static int
 bfin_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr)
 {
@@ -583,6 +585,8 @@ bfin_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr)
     return 2;
 }
 
+/* Implement the sw_breakpoint_from_kind gdbarch method.  */
+
 static const gdb_byte *
 bfin_sw_breakpoint_from_kind (struct gdbarch *gdbarch, int kind, int *size)
 {

gdb/breakpoint.c

@@ -2603,6 +2603,14 @@ build_target_command_list (struct bp_location *bl)
     bl->target_info.persist = 1;
 }
 
+/* Return the kind of breakpoint on address *ADDR.  */
+
+static int
+breakpoint_kind (struct bp_location *bl, CORE_ADDR *addr)
+{
+  return gdbarch_breakpoint_kind_from_pc (bl->gdbarch, addr);
+}
+
 /* Insert a low-level "breakpoint" of some type.  BL is the breakpoint
    location.  Any error messages are printed to TMP_ERROR_STREAM; and
    DISABLED_BREAKS, and HW_BREAKPOINT_ERROR are used to report problems.
@@ -2762,6 +2770,9 @@ insert_bp_location (struct bp_location *bl,
 		    {
 		      int val;
 
+		      bl->overlay_target_info.placed_size
+			= breakpoint_kind (bl, &addr);
+		      bl->overlay_target_info.placed_address = addr;
 		      val = target_insert_breakpoint (bl->gdbarch,
 						      &bl->overlay_target_info);
 		      if (val)
@@ -13113,6 +13124,11 @@ bkpt_re_set (struct breakpoint *b)
 static int
 bkpt_insert_location (struct bp_location *bl)
 {
+  CORE_ADDR addr = bl->target_info.reqstd_address;
+
+  bl->target_info.placed_size = breakpoint_kind (bl, &addr);
+  bl->target_info.placed_address = addr;
+
   if (bl->loc_type == bp_loc_hardware_breakpoint)
     return target_insert_hw_breakpoint (bl->gdbarch, &bl->target_info);
   else

gdb/cris-tdep.c

@@ -1391,12 +1391,16 @@ cris_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
   return sp;
 }
 
+/* Implement the breakpoint_kind_from_pc gdbarch method.  */
+
 static int
 cris_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr)
 {
   return 2;
 }
 
+/* Implement the sw_breakpoint_from_kind gdbarch method.  */
+
 static const gdb_byte *
 cris_sw_breakpoint_from_kind (struct gdbarch *gdbarch, int kind, int *size)
 {

gdb/gdbarch.c

@@ -230,6 +230,8 @@ struct gdbarch
   gdbarch_skip_entrypoint_ftype *skip_entrypoint;
   gdbarch_inner_than_ftype *inner_than;
   gdbarch_breakpoint_from_pc_ftype *breakpoint_from_pc;
+  gdbarch_breakpoint_kind_from_pc_ftype *breakpoint_kind_from_pc;
+  gdbarch_sw_breakpoint_from_kind_ftype *sw_breakpoint_from_kind;
   gdbarch_remote_breakpoint_from_pc_ftype *remote_breakpoint_from_pc;
   gdbarch_adjust_breakpoint_address_ftype *adjust_breakpoint_address;
   gdbarch_memory_insert_breakpoint_ftype *memory_insert_breakpoint;
@@ -403,6 +405,7 @@ gdbarch_alloc (const struct gdbarch_info *info,
   gdbarch->pointer_to_address = unsigned_pointer_to_address;
   gdbarch->address_to_pointer = unsigned_address_to_pointer;
   gdbarch->return_in_first_hidden_param_p = default_return_in_first_hidden_param_p;
+  gdbarch->sw_breakpoint_from_kind = NULL;
   gdbarch->remote_breakpoint_from_pc = default_remote_breakpoint_from_pc;
   gdbarch->memory_insert_breakpoint = default_memory_insert_breakpoint;
   gdbarch->memory_remove_breakpoint = default_memory_remove_breakpoint;
@@ -583,6 +586,9 @@ verify_gdbarch (struct gdbarch *gdbarch)
     fprintf_unfiltered (log, "\n\tinner_than");
   if (gdbarch->breakpoint_from_pc == 0)
     fprintf_unfiltered (log, "\n\tbreakpoint_from_pc");
+  if (gdbarch->breakpoint_kind_from_pc == 0)
+    fprintf_unfiltered (log, "\n\tbreakpoint_kind_from_pc");
+  /* Skip verify of sw_breakpoint_from_kind, invalid_p == 0 */
   /* Skip verify of remote_breakpoint_from_pc, invalid_p == 0 */
   /* Skip verify of adjust_breakpoint_address, has predicate.  */
   /* Skip verify of memory_insert_breakpoint, invalid_p == 0 */
@@ -792,6 +798,9 @@ gdbarch_dump (struct gdbarch *gdbarch, struct ui_file *file)
   fprintf_unfiltered (file,
                       "gdbarch_dump: breakpoint_from_pc = <%s>\n",
                       host_address_to_string (gdbarch->breakpoint_from_pc));
+  fprintf_unfiltered (file,
+                      "gdbarch_dump: breakpoint_kind_from_pc = <%s>\n",
+                      host_address_to_string (gdbarch->breakpoint_kind_from_pc));
   fprintf_unfiltered (file,
                       "gdbarch_dump: byte_order = %s\n",
                       plongest (gdbarch->byte_order));
@@ -1398,6 +1407,9 @@ gdbarch_dump (struct gdbarch *gdbarch, struct ui_file *file)
   fprintf_unfiltered (file,
                       "gdbarch_dump: static_transform_name = <%s>\n",
                       host_address_to_string (gdbarch->static_transform_name));
+  fprintf_unfiltered (file,
+                      "gdbarch_dump: sw_breakpoint_from_kind = <%s>\n",
+                      host_address_to_string (gdbarch->sw_breakpoint_from_kind));
   fprintf_unfiltered (file,
                       "gdbarch_dump: syscalls_info = %s\n",
                       host_address_to_string (gdbarch->syscalls_info));
@@ -2782,6 +2794,40 @@ set_gdbarch_breakpoint_from_pc (struct gdbarch *gdbarch,
   gdbarch->breakpoint_from_pc = breakpoint_from_pc;
 }
 
+int
+gdbarch_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr)
+{
+  gdb_assert (gdbarch != NULL);
+  gdb_assert (gdbarch->breakpoint_kind_from_pc != NULL);
+  if (gdbarch_debug >= 2)
+    fprintf_unfiltered (gdb_stdlog, "gdbarch_breakpoint_kind_from_pc called\n");
+  return gdbarch->breakpoint_kind_from_pc (gdbarch, pcptr);
+}
+
+void
+set_gdbarch_breakpoint_kind_from_pc (struct gdbarch *gdbarch,
+                                     gdbarch_breakpoint_kind_from_pc_ftype breakpoint_kind_from_pc)
+{
+  gdbarch->breakpoint_kind_from_pc = breakpoint_kind_from_pc;
+}
+
+const gdb_byte *
+gdbarch_sw_breakpoint_from_kind (struct gdbarch *gdbarch, int kind, int *size)
+{
+  gdb_assert (gdbarch != NULL);
+  gdb_assert (gdbarch->sw_breakpoint_from_kind != NULL);
+  if (gdbarch_debug >= 2)
+    fprintf_unfiltered (gdb_stdlog, "gdbarch_sw_breakpoint_from_kind called\n");
+  return gdbarch->sw_breakpoint_from_kind (gdbarch, kind, size);
+}
+
+void
+set_gdbarch_sw_breakpoint_from_kind (struct gdbarch *gdbarch,
+                                     gdbarch_sw_breakpoint_from_kind_ftype sw_breakpoint_from_kind)
+{
+  gdbarch->sw_breakpoint_from_kind = sw_breakpoint_from_kind;
+}
+
 void
 gdbarch_remote_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, int *kindptr)
 {

gdb/gdbarch.h

@@ -550,6 +550,20 @@ typedef const gdb_byte * (gdbarch_breakpoint_from_pc_ftype) (struct gdbarch *gdb
 extern const gdb_byte * gdbarch_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr, int *lenptr);
 extern void set_gdbarch_breakpoint_from_pc (struct gdbarch *gdbarch, gdbarch_breakpoint_from_pc_ftype *breakpoint_from_pc);
 
+/* Return the breakpoint kind for this target based on *PCPTR. */
+
+typedef int (gdbarch_breakpoint_kind_from_pc_ftype) (struct gdbarch *gdbarch, CORE_ADDR *pcptr);
+extern int gdbarch_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr);
+extern void set_gdbarch_breakpoint_kind_from_pc (struct gdbarch *gdbarch, gdbarch_breakpoint_kind_from_pc_ftype *breakpoint_kind_from_pc);
+
+/* Return the software breakpoint from KIND.  KIND can have target
+   specific meaning like the Z0 kind parameter.
+   SIZE is set to the software breakpoint's length in memory. */
+
+typedef const gdb_byte * (gdbarch_sw_breakpoint_from_kind_ftype) (struct gdbarch *gdbarch, int kind, int *size);
+extern const gdb_byte * gdbarch_sw_breakpoint_from_kind (struct gdbarch *gdbarch, int kind, int *size);
+extern void set_gdbarch_sw_breakpoint_from_kind (struct gdbarch *gdbarch, gdbarch_sw_breakpoint_from_kind_ftype *sw_breakpoint_from_kind);
+
 /* Return the adjusted address and kind to use for Z0/Z1 packets.
    KIND is usually the memory length of the breakpoint, but may have a
    different target-specific meaning. */

gdb/gdbarch.sh

@@ -560,6 +560,15 @@ M:CORE_ADDR:skip_entrypoint:CORE_ADDR ip:ip
 
 f:int:inner_than:CORE_ADDR lhs, CORE_ADDR rhs:lhs, rhs:0:0
 m:const gdb_byte *:breakpoint_from_pc:CORE_ADDR *pcptr, int *lenptr:pcptr, lenptr::0:
+
+# Return the breakpoint kind for this target based on *PCPTR.
+m:int:breakpoint_kind_from_pc:CORE_ADDR *pcptr:pcptr::0:
+
+# Return the software breakpoint from KIND.  KIND can have target
+# specific meaning like the Z0 kind parameter.
+# SIZE is set to the software breakpoint's length in memory.
+m:const gdb_byte *:sw_breakpoint_from_kind:int kind, int *size:kind, size::NULL::0
+
 # Return the adjusted address and kind to use for Z0/Z1 packets.
 # KIND is usually the memory length of the breakpoint, but may have a
 # different target-specific meaning.

gdb/ia64-tdep.c

@@ -719,8 +719,6 @@ ia64_memory_insert_breakpoint (struct gdbarch *gdbarch,
 		    paddress (gdbarch, bp_tgt->placed_address));
   replace_slotN_contents (bundle, IA64_BREAKPOINT, slotnum);
 
-  bp_tgt->placed_size = bp_tgt->shadow_len;
-
   val = target_write_memory (addr + shadow_slotnum, bundle + shadow_slotnum,
 			     bp_tgt->shadow_len);
 
@@ -783,8 +781,7 @@ ia64_memory_remove_breakpoint (struct gdbarch *gdbarch,
       slotnum = 2;
     }
 
-  gdb_assert (bp_tgt->placed_size == BUNDLE_LEN - shadow_slotnum);
-  gdb_assert (bp_tgt->placed_size == bp_tgt->shadow_len);
+  gdb_assert (bp_tgt->shadow_len == BUNDLE_LEN - shadow_slotnum);
 
   instr_breakpoint = slotN_contents (bundle_mem, slotnum);
   if (instr_breakpoint != IA64_BREAKPOINT)
@@ -812,6 +809,15 @@ ia64_memory_remove_breakpoint (struct gdbarch *gdbarch,
   return val;
 }
 
+/* Implement the breakpoint_kind_from_pc gdbarch method.  */
+
+static int
+ia64_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr)
+{
+  /* A place holder of gdbarch method breakpoint_kind_from_pc.   */
+  return 0;
+}
+
 /* As gdbarch_breakpoint_from_pc ranges have byte granularity and ia64
    instruction slots ranges are bit-granular (41 bits) we have to provide an
    extended range as described for ia64_memory_insert_breakpoint.  We also take
@@ -4009,6 +4015,7 @@ ia64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   set_gdbarch_memory_remove_breakpoint (gdbarch,
 					ia64_memory_remove_breakpoint);
   set_gdbarch_breakpoint_from_pc (gdbarch, ia64_breakpoint_from_pc);
+  set_gdbarch_breakpoint_kind_from_pc (gdbarch, ia64_breakpoint_kind_from_pc);
   set_gdbarch_read_pc (gdbarch, ia64_read_pc);
   set_gdbarch_write_pc (gdbarch, ia64_write_pc);