gdb: rename displaced_step_closure to displaced_step_copy_insn_closure

Since we're going to introduce other "displaced step" functions and
another kind of displaced step closure, make it clear that this is the
return type of the gdbarch_displaced_step_copy_insn function.

gdb/ChangeLog:

	* infrun.h (get_displaced_step_closure_by_addr): Rename to...
	(get_displaced_step_copy_insn_closure_by_addr): ... this.
	Update all users.
	(displaced_step_closure): Rename to...
	(displaced_step_copy_insn_closure): ... this.  Update all users.
	(displaced_step_closure_up): Rename to...
	(displaced_step_copy_insn_closure_up). ... this.  Update all
	users.
	(buf_displaced_step_closure): Rename to...
	(buf_displaced_step_copy_insn_closure): ... this.  Update all
	users.
	* infrun.c (get_displaced_step_closure_by_addr): Rename to...
	(get_displaced_step_copy_insn_closure_by_addr): ... this.
	Update all users.
	* aarch64-tdep.c (aarch64_displaced_step_closure): Rename to...
	(aarch64_displaced_step_copy_insn_closure): ... this.  Update
	all users.
	* amd64-tdep.c (amd64_displaced_step_closure): Rename to...
	(amd64_displaced_step_copy_insn_closure): ... this.  Update all
	users.
	* arm-tdep.h (arm_displaced_step_closure): Rename to...
	(arm_displaced_step_copy_insn_closure): ... this.  Update all
	users.
	* i386-tdep.h (i386_displaced_step_closure): Rename to...
	(i386_displaced_step_copy_insn_closure): ... this.  Update all
	users.
	* rs6000-tdep.c (ppc_displaced_step_closure): Rename to...
	(ppc_displaced_step_copy_insn_closure): ... this.  Update all
	users.
	* s390-tdep.c (s390_displaced_step_closure): Rename to...
	(s390_displaced_step_copy_insn_closure): ... this.  Update all
	users.
	* gdbarch.h: Re-generate.
	* gdbarch.c: Re-generate.

Change-Id: I11f56dbcd4c3532fb195a08ba93bccf1d12a03c8

18 files changed, 244 insertions, 193 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 416f666..a238bcd 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,42 @@
 2020-12-04  Simon Marchi  <simon.marchi@efficios.com>
 
+	* infrun.h (get_displaced_step_closure_by_addr): Rename to...
+	(get_displaced_step_copy_insn_closure_by_addr): ... this.
+	Update all users.
+	(displaced_step_closure): Rename to...
+	(displaced_step_copy_insn_closure): ... this.  Update all users.
+	(displaced_step_closure_up): Rename to...
+	(displaced_step_copy_insn_closure_up). ... this.  Update all
+	users.
+	(buf_displaced_step_closure): Rename to...
+	(buf_displaced_step_copy_insn_closure): ... this.  Update all
+	users.
+	* infrun.c (get_displaced_step_closure_by_addr): Rename to...
+	(get_displaced_step_copy_insn_closure_by_addr): ... this.
+	Update all users.
+	* aarch64-tdep.c (aarch64_displaced_step_closure): Rename to...
+	(aarch64_displaced_step_copy_insn_closure): ... this.  Update
+	all users.
+	* amd64-tdep.c (amd64_displaced_step_closure): Rename to...
+	(amd64_displaced_step_copy_insn_closure): ... this.  Update all
+	users.
+	* arm-tdep.h (arm_displaced_step_closure): Rename to...
+	(arm_displaced_step_copy_insn_closure): ... this.  Update all
+	users.
+	* i386-tdep.h (i386_displaced_step_closure): Rename to...
+	(i386_displaced_step_copy_insn_closure): ... this.  Update all
+	users.
+	* rs6000-tdep.c (ppc_displaced_step_closure): Rename to...
+	(ppc_displaced_step_copy_insn_closure): ... this.  Update all
+	users.
+	* s390-tdep.c (s390_displaced_step_closure): Rename to...
+	(s390_displaced_step_copy_insn_closure): ... this.  Update all
+	users.
+	* gdbarch.h: Re-generate.
+	* gdbarch.c: Re-generate.
+
+2020-12-04  Simon Marchi  <simon.marchi@efficios.com>
+
 	* gdbthread.h (thread_step_over_chain_enqueue): Rename to...
 	(global_thread_step_over_chain_enqueue): ... this.  Update all
 	users.
diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c
index 680b53f..40c73be 100644
--- a/gdb/aarch64-tdep.c
+++ b/gdb/aarch64-tdep.c
@@ -2899,7 +2899,8 @@ aarch64_software_single_step (struct regcache *regcache)
   return next_pcs;
 }
 
-struct aarch64_displaced_step_closure : public displaced_step_closure
+struct aarch64_displaced_step_copy_insn_closure
+  : public displaced_step_copy_insn_closure
 {
   /* It is true when condition instruction, such as B.CON, TBZ, etc,
      is being displaced stepping.  */
@@ -2925,7 +2926,7 @@ struct aarch64_displaced_step_data
   /* Registers when doing displaced stepping.  */
   struct regcache *regs;
 
-  aarch64_displaced_step_closure *dsc;
+  aarch64_displaced_step_copy_insn_closure *dsc;
 };
 
 /* Implementation of aarch64_insn_visitor method "b".  */
@@ -3134,7 +3135,7 @@ static const struct aarch64_insn_visitor visitor =
 
 /* Implement the "displaced_step_copy_insn" gdbarch method.  */
 
-displaced_step_closure_up
+displaced_step_copy_insn_closure_up
 aarch64_displaced_step_copy_insn (struct gdbarch *gdbarch,
 				  CORE_ADDR from, CORE_ADDR to,
 				  struct regcache *regs)
@@ -3154,8 +3155,8 @@ aarch64_displaced_step_copy_insn (struct gdbarch *gdbarch,
       return NULL;
     }
 
-  std::unique_ptr<aarch64_displaced_step_closure> dsc
-    (new aarch64_displaced_step_closure);
+  std::unique_ptr<aarch64_displaced_step_copy_insn_closure> dsc
+    (new aarch64_displaced_step_copy_insn_closure);
   dsd.base.insn_addr = from;
   dsd.new_addr = to;
   dsd.regs = regs;
@@ -3187,18 +3188,19 @@ aarch64_displaced_step_copy_insn (struct gdbarch *gdbarch,
     }
 
   /* This is a work around for a problem with g++ 4.8.  */
-  return displaced_step_closure_up (dsc.release ());
+  return displaced_step_copy_insn_closure_up (dsc.release ());
 }
 
 /* Implement the "displaced_step_fixup" gdbarch method.  */
 
 void
 aarch64_displaced_step_fixup (struct gdbarch *gdbarch,
-			      struct displaced_step_closure *dsc_,
+			      struct displaced_step_copy_insn_closure *dsc_,
 			      CORE_ADDR from, CORE_ADDR to,
 			      struct regcache *regs)
 {
-  aarch64_displaced_step_closure *dsc = (aarch64_displaced_step_closure *) dsc_;
+  aarch64_displaced_step_copy_insn_closure *dsc
+    = (aarch64_displaced_step_copy_insn_closure *) dsc_;
 
   ULONGEST pc;
 
diff --git a/gdb/aarch64-tdep.h b/gdb/aarch64-tdep.h
index 81ce4d8..895aa59 100644
--- a/gdb/aarch64-tdep.h
+++ b/gdb/aarch64-tdep.h
@@ -107,13 +107,13 @@ const target_desc *aarch64_read_description (uint64_t vq, bool pauth_p);
 extern int aarch64_process_record (struct gdbarch *gdbarch,
 			       struct regcache *regcache, CORE_ADDR addr);
 
-displaced_step_closure_up
+displaced_step_copy_insn_closure_up
   aarch64_displaced_step_copy_insn (struct gdbarch *gdbarch,
 				    CORE_ADDR from, CORE_ADDR to,
 				    struct regcache *regs);
 
 void aarch64_displaced_step_fixup (struct gdbarch *gdbarch,
-				   struct displaced_step_closure *dsc,
+				   displaced_step_copy_insn_closure *dsc,
 				   CORE_ADDR from, CORE_ADDR to,
 				   struct regcache *regs);
 
diff --git a/gdb/amd64-tdep.c b/gdb/amd64-tdep.c
index 31d4d34..d2bcbe1 100644
--- a/gdb/amd64-tdep.c
+++ b/gdb/amd64-tdep.c
@@ -1103,9 +1103,10 @@ struct amd64_insn
   gdb_byte *raw_insn;
 };
 
-struct amd64_displaced_step_closure : public displaced_step_closure
+struct amd64_displaced_step_copy_insn_closure
+  : public displaced_step_copy_insn_closure
 {
-  amd64_displaced_step_closure (int insn_buf_len)
+  amd64_displaced_step_copy_insn_closure (int insn_buf_len)
   : insn_buf (insn_buf_len, 0)
   {}
 
@@ -1386,7 +1387,8 @@ amd64_get_insn_details (gdb_byte *insn, struct amd64_insn *details)
    We set base = pc + insn_length so we can leave disp unchanged.  */
 
 static void
-fixup_riprel (struct gdbarch *gdbarch, amd64_displaced_step_closure *dsc,
+fixup_riprel (struct gdbarch *gdbarch,
+	      amd64_displaced_step_copy_insn_closure *dsc,
 	      CORE_ADDR from, CORE_ADDR to, struct regcache *regs)
 {
   const struct amd64_insn *insn_details = &dsc->insn_details;
@@ -1447,7 +1449,7 @@ fixup_riprel (struct gdbarch *gdbarch, amd64_displaced_step_closure *dsc,
 
 static void
 fixup_displaced_copy (struct gdbarch *gdbarch,
-		      amd64_displaced_step_closure *dsc,
+		      amd64_displaced_step_copy_insn_closure *dsc,
 		      CORE_ADDR from, CORE_ADDR to, struct regcache *regs)
 {
   const struct amd64_insn *details = &dsc->insn_details;
@@ -1465,7 +1467,7 @@ fixup_displaced_copy (struct gdbarch *gdbarch,
     }
 }
 
-displaced_step_closure_up
+displaced_step_copy_insn_closure_up
 amd64_displaced_step_copy_insn (struct gdbarch *gdbarch,
 				CORE_ADDR from, CORE_ADDR to,
 				struct regcache *regs)
@@ -1474,8 +1476,8 @@ amd64_displaced_step_copy_insn (struct gdbarch *gdbarch,
   /* Extra space for sentinels so fixup_{riprel,displaced_copy} don't have to
      continually watch for running off the end of the buffer.  */
   int fixup_sentinel_space = len;
-  std::unique_ptr<amd64_displaced_step_closure> dsc
-    (new amd64_displaced_step_closure (len + fixup_sentinel_space));
+  std::unique_ptr<amd64_displaced_step_copy_insn_closure> dsc
+    (new amd64_displaced_step_copy_insn_closure (len + fixup_sentinel_space));
   gdb_byte *buf = &dsc->insn_buf[0];
   struct amd64_insn *details = &dsc->insn_details;
 
@@ -1509,7 +1511,7 @@ amd64_displaced_step_copy_insn (struct gdbarch *gdbarch,
 			  displaced_step_dump_bytes (buf, len).c_str ());
 
   /* This is a work around for a problem with g++ 4.8.  */
-  return displaced_step_closure_up (dsc.release ());
+  return displaced_step_copy_insn_closure_up (dsc.release ());
 }
 
 static int
@@ -1671,11 +1673,12 @@ amd64_insn_is_jump (struct gdbarch *gdbarch, CORE_ADDR addr)
 
 void
 amd64_displaced_step_fixup (struct gdbarch *gdbarch,
-			    struct displaced_step_closure *dsc_,
+			    struct displaced_step_copy_insn_closure *dsc_,
 			    CORE_ADDR from, CORE_ADDR to,
 			    struct regcache *regs)
 {
-  amd64_displaced_step_closure *dsc = (amd64_displaced_step_closure *) dsc_;
+  amd64_displaced_step_copy_insn_closure *dsc
+    = (amd64_displaced_step_copy_insn_closure *) dsc_;
   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
   /* The offset we applied to the instruction's address.  */
   ULONGEST insn_offset = to - from;
diff --git a/gdb/amd64-tdep.h b/gdb/amd64-tdep.h
index a4e6956..56aef6c 100644
--- a/gdb/amd64-tdep.h
+++ b/gdb/amd64-tdep.h
@@ -88,13 +88,12 @@ enum amd64_regnum
 
 #define AMD64_NUM_REGS		(AMD64_GSBASE_REGNUM + 1)
 
-extern displaced_step_closure_up amd64_displaced_step_copy_insn
+extern displaced_step_copy_insn_closure_up amd64_displaced_step_copy_insn
   (struct gdbarch *gdbarch, CORE_ADDR from, CORE_ADDR to,
    struct regcache *regs);
-extern void amd64_displaced_step_fixup (struct gdbarch *gdbarch,
-					struct displaced_step_closure *closure,
-					CORE_ADDR from, CORE_ADDR to,
-					struct regcache *regs);
+extern void amd64_displaced_step_fixup
+  (struct gdbarch *gdbarch, displaced_step_copy_insn_closure *closure,
+   CORE_ADDR from, CORE_ADDR to, struct regcache *regs);
 
 /* Initialize the ABI for amd64.  Uses DEFAULT_TDESC as fallback
    tdesc, if INFO does not specify one.  */
diff --git a/gdb/arm-linux-tdep.c b/gdb/arm-linux-tdep.c
index 2d563c2..9caae06 100644
--- a/gdb/arm-linux-tdep.c
+++ b/gdb/arm-linux-tdep.c
@@ -946,7 +946,7 @@ arm_linux_software_single_step (struct regcache *regcache)
 static void
 arm_linux_cleanup_svc (struct gdbarch *gdbarch,
 		       struct regcache *regs,
-		       arm_displaced_step_closure *dsc)
+		       arm_displaced_step_copy_insn_closure *dsc)
 {
   ULONGEST apparent_pc;
   int within_scratch;
@@ -970,7 +970,7 @@ arm_linux_cleanup_svc (struct gdbarch *gdbarch,
 
 static int
 arm_linux_copy_svc (struct gdbarch *gdbarch, struct regcache *regs,
-		    arm_displaced_step_closure *dsc)
+		    arm_displaced_step_copy_insn_closure *dsc)
 {
   CORE_ADDR return_to = 0;
 
@@ -1056,7 +1056,7 @@ arm_linux_copy_svc (struct gdbarch *gdbarch, struct regcache *regs,
 static void
 cleanup_kernel_helper_return (struct gdbarch *gdbarch,
 			      struct regcache *regs,
-			      arm_displaced_step_closure *dsc)
+			      arm_displaced_step_copy_insn_closure *dsc)
 {
   displaced_write_reg (regs, dsc, ARM_LR_REGNUM, dsc->tmp[0], CANNOT_WRITE_PC);
   displaced_write_reg (regs, dsc, ARM_PC_REGNUM, dsc->tmp[0], BRANCH_WRITE_PC);
@@ -1065,7 +1065,7 @@ cleanup_kernel_helper_return (struct gdbarch *gdbarch,
 static void
 arm_catch_kernel_helper_return (struct gdbarch *gdbarch, CORE_ADDR from,
 				CORE_ADDR to, struct regcache *regs,
-				arm_displaced_step_closure *dsc)
+				arm_displaced_step_copy_insn_closure *dsc)
 {
   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 
@@ -1094,13 +1094,13 @@ arm_catch_kernel_helper_return (struct gdbarch *gdbarch, CORE_ADDR from,
    the program has stepped into a Linux kernel helper routine (which must be
    handled as a special case).  */
 
-static displaced_step_closure_up
+static displaced_step_copy_insn_closure_up
 arm_linux_displaced_step_copy_insn (struct gdbarch *gdbarch,
 				    CORE_ADDR from, CORE_ADDR to,
 				    struct regcache *regs)
 {
-  std::unique_ptr<arm_displaced_step_closure> dsc
-    (new arm_displaced_step_closure);
+  std::unique_ptr<arm_displaced_step_copy_insn_closure> dsc
+    (new arm_displaced_step_copy_insn_closure);
 
   /* Detect when we enter an (inaccessible by GDB) Linux kernel helper, and
      stop at the return location.  */
@@ -1122,7 +1122,7 @@ arm_linux_displaced_step_copy_insn (struct gdbarch *gdbarch,
   arm_displaced_init_closure (gdbarch, from, to, dsc.get ());
 
   /* This is a work around for a problem with g++ 4.8.  */
-  return displaced_step_closure_up (dsc.release ());
+  return displaced_step_copy_insn_closure_up (dsc.release ());
 }
 
 /* Implementation of `gdbarch_stap_is_single_operand', as defined in
diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c
index d1e3a98..bc086e1 100644
--- a/gdb/arm-tdep.c
+++ b/gdb/arm-tdep.c
@@ -433,9 +433,9 @@ arm_pc_is_thumb (struct gdbarch *gdbarch, CORE_ADDR memaddr)
 {
   struct bound_minimal_symbol sym;
   char type;
-  arm_displaced_step_closure *dsc
-    = ((arm_displaced_step_closure * )
-	get_displaced_step_closure_by_addr (memaddr));
+  arm_displaced_step_copy_insn_closure *dsc
+    = ((arm_displaced_step_copy_insn_closure * )
+	get_displaced_step_copy_insn_closure_by_addr (memaddr));
 
   /* If checking the mode of displaced instruction in copy area, the mode
      should be determined by instruction on the original address.  */
@@ -4474,7 +4474,7 @@ arm_adjust_breakpoint_address (struct gdbarch *gdbarch, CORE_ADDR bpaddr)
    location.  */
 
 ULONGEST
-displaced_read_reg (struct regcache *regs, arm_displaced_step_closure *dsc,
+displaced_read_reg (regcache *regs, arm_displaced_step_copy_insn_closure *dsc,
 		    int regno)
 {
   ULONGEST ret;
@@ -4522,7 +4522,7 @@ displaced_in_arm_mode (struct regcache *regs)
 /* Write to the PC as from a branch instruction.  */
 
 static void
-branch_write_pc (struct regcache *regs, arm_displaced_step_closure *dsc,
+branch_write_pc (regcache *regs, arm_displaced_step_copy_insn_closure *dsc,
 		 ULONGEST val)
 {
   if (!dsc->is_thumb)
@@ -4568,7 +4568,7 @@ bx_write_pc (struct regcache *regs, ULONGEST val)
 /* Write to the PC as if from a load instruction.  */
 
 static void
-load_write_pc (struct regcache *regs, arm_displaced_step_closure *dsc,
+load_write_pc (regcache *regs, arm_displaced_step_copy_insn_closure *dsc,
 	       ULONGEST val)
 {
   if (DISPLACED_STEPPING_ARCH_VERSION >= 5)
@@ -4580,7 +4580,7 @@ load_write_pc (struct regcache *regs, arm_displaced_step_closure *dsc,
 /* Write to the PC as if from an ALU instruction.  */
 
 static void
-alu_write_pc (struct regcache *regs, arm_displaced_step_closure *dsc,
+alu_write_pc (regcache *regs, arm_displaced_step_copy_insn_closure *dsc,
 	      ULONGEST val)
 {
   if (DISPLACED_STEPPING_ARCH_VERSION >= 7 && !dsc->is_thumb)
@@ -4594,7 +4594,7 @@ alu_write_pc (struct regcache *regs, arm_displaced_step_closure *dsc,
    this is controlled by the WRITE_PC argument.  */
 
 void
-displaced_write_reg (struct regcache *regs, arm_displaced_step_closure *dsc,
+displaced_write_reg (regcache *regs, arm_displaced_step_copy_insn_closure *dsc,
 		     int regno, ULONGEST val, enum pc_write_style write_pc)
 {
   if (regno == ARM_PC_REGNUM)
@@ -4675,8 +4675,8 @@ insn_references_pc (uint32_t insn, uint32_t bitmask)
    matter what address they are executed at: in those cases, use this.  */
 
 static int
-arm_copy_unmodified (struct gdbarch *gdbarch, uint32_t insn,
-		     const char *iname, arm_displaced_step_closure *dsc)
+arm_copy_unmodified (struct gdbarch *gdbarch, uint32_t insn, const char *iname,
+		     arm_displaced_step_copy_insn_closure *dsc)
 {
   displaced_debug_printf ("copying insn %.8lx, opcode/class '%s' unmodified",
 			  (unsigned long) insn, iname);
@@ -4689,7 +4689,7 @@ arm_copy_unmodified (struct gdbarch *gdbarch, uint32_t insn,
 static int
 thumb_copy_unmodified_32bit (struct gdbarch *gdbarch, uint16_t insn1,
 			     uint16_t insn2, const char *iname,
-			     arm_displaced_step_closure *dsc)
+			     arm_displaced_step_copy_insn_closure *dsc)
 {
   displaced_debug_printf ("copying insn %.4x %.4x, opcode/class '%s' "
 			  "unmodified", insn1, insn2, iname);
@@ -4706,7 +4706,7 @@ thumb_copy_unmodified_32bit (struct gdbarch *gdbarch, uint16_t insn1,
 static int
 thumb_copy_unmodified_16bit (struct gdbarch *gdbarch, uint16_t insn,
 			     const char *iname,
-			     arm_displaced_step_closure *dsc)
+			     arm_displaced_step_copy_insn_closure *dsc)
 {
   displaced_debug_printf ("copying insn %.4x, opcode/class '%s' unmodified",
 			  insn, iname);
@@ -4719,8 +4719,8 @@ thumb_copy_unmodified_16bit (struct gdbarch *gdbarch, uint16_t insn,
 /* Preload instructions with immediate offset.  */
 
 static void
-cleanup_preload (struct gdbarch *gdbarch,
-		 struct regcache *regs, arm_displaced_step_closure *dsc)
+cleanup_preload (struct gdbarch *gdbarch, regcache *regs,
+		 arm_displaced_step_copy_insn_closure *dsc)
 {
   displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC);
   if (!dsc->u.preload.immed)
@@ -4729,7 +4729,7 @@ cleanup_preload (struct gdbarch *gdbarch,
 
 static void
 install_preload (struct gdbarch *gdbarch, struct regcache *regs,
-		 arm_displaced_step_closure *dsc, unsigned int rn)
+		 arm_displaced_step_copy_insn_closure *dsc, unsigned int rn)
 {
   ULONGEST rn_val;
   /* Preload instructions:
@@ -4748,7 +4748,7 @@ install_preload (struct gdbarch *gdbarch, struct regcache *regs,
 
 static int
 arm_copy_preload (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs,
-		  arm_displaced_step_closure *dsc)
+		  arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int rn = bits (insn, 16, 19);
 
@@ -4766,7 +4766,7 @@ arm_copy_preload (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs,
 
 static int
 thumb2_copy_preload (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2,
-		     struct regcache *regs, arm_displaced_step_closure *dsc)
+		     regcache *regs, arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int rn = bits (insn1, 0, 3);
   unsigned int u_bit = bit (insn1, 7);
@@ -4814,7 +4814,7 @@ thumb2_copy_preload (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2,
 
 static void
 install_preload_reg(struct gdbarch *gdbarch, struct regcache *regs,
-		    arm_displaced_step_closure *dsc, unsigned int rn,
+		    arm_displaced_step_copy_insn_closure *dsc, unsigned int rn,
 		    unsigned int rm)
 {
   ULONGEST rn_val, rm_val;
@@ -4839,7 +4839,7 @@ install_preload_reg(struct gdbarch *gdbarch, struct regcache *regs,
 static int
 arm_copy_preload_reg (struct gdbarch *gdbarch, uint32_t insn,
 		      struct regcache *regs,
-		      arm_displaced_step_closure *dsc)
+		      arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int rn = bits (insn, 16, 19);
   unsigned int rm = bits (insn, 0, 3);
@@ -4862,7 +4862,7 @@ arm_copy_preload_reg (struct gdbarch *gdbarch, uint32_t insn,
 static void
 cleanup_copro_load_store (struct gdbarch *gdbarch,
 			  struct regcache *regs,
-			  arm_displaced_step_closure *dsc)
+			  arm_displaced_step_copy_insn_closure *dsc)
 {
   ULONGEST rn_val = displaced_read_reg (regs, dsc, 0);
 
@@ -4874,7 +4874,7 @@ cleanup_copro_load_store (struct gdbarch *gdbarch,
 
 static void
 install_copro_load_store (struct gdbarch *gdbarch, struct regcache *regs,
-			  arm_displaced_step_closure *dsc,
+			  arm_displaced_step_copy_insn_closure *dsc,
 			  int writeback, unsigned int rn)
 {
   ULONGEST rn_val;
@@ -4902,7 +4902,7 @@ install_copro_load_store (struct gdbarch *gdbarch, struct regcache *regs,
 static int
 arm_copy_copro_load_store (struct gdbarch *gdbarch, uint32_t insn,
 			   struct regcache *regs,
-			   arm_displaced_step_closure *dsc)
+			   arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int rn = bits (insn, 16, 19);
 
@@ -4922,7 +4922,7 @@ arm_copy_copro_load_store (struct gdbarch *gdbarch, uint32_t insn,
 static int
 thumb2_copy_copro_load_store (struct gdbarch *gdbarch, uint16_t insn1,
 			      uint16_t insn2, struct regcache *regs,
-			      arm_displaced_step_closure *dsc)
+			      arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int rn = bits (insn1, 0, 3);
 
@@ -4949,7 +4949,7 @@ thumb2_copy_copro_load_store (struct gdbarch *gdbarch, uint16_t insn1,
 
 static void
 cleanup_branch (struct gdbarch *gdbarch, struct regcache *regs,
-		arm_displaced_step_closure *dsc)
+		arm_displaced_step_copy_insn_closure *dsc)
 {
   uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM);
   int branch_taken = condition_true (dsc->u.branch.cond, status);
@@ -4980,7 +4980,7 @@ cleanup_branch (struct gdbarch *gdbarch, struct regcache *regs,
 
 static void
 install_b_bl_blx (struct gdbarch *gdbarch, struct regcache *regs,
-		  arm_displaced_step_closure *dsc,
+		  arm_displaced_step_copy_insn_closure *dsc,
 		  unsigned int cond, int exchange, int link, long offset)
 {
   /* Implement "BL<cond> <label>" as:
@@ -5009,7 +5009,7 @@ install_b_bl_blx (struct gdbarch *gdbarch, struct regcache *regs,
 }
 static int
 arm_copy_b_bl_blx (struct gdbarch *gdbarch, uint32_t insn,
-		   struct regcache *regs, arm_displaced_step_closure *dsc)
+		   regcache *regs, arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int cond = bits (insn, 28, 31);
   int exchange = (cond == 0xf);
@@ -5038,7 +5038,7 @@ arm_copy_b_bl_blx (struct gdbarch *gdbarch, uint32_t insn,
 static int
 thumb2_copy_b_bl_blx (struct gdbarch *gdbarch, uint16_t insn1,
 		      uint16_t insn2, struct regcache *regs,
-		      arm_displaced_step_closure *dsc)
+		      arm_displaced_step_copy_insn_closure *dsc)
 {
   int link = bit (insn2, 14);
   int exchange = link && !bit (insn2, 12);
@@ -5091,7 +5091,7 @@ thumb2_copy_b_bl_blx (struct gdbarch *gdbarch, uint16_t insn1,
 /* Copy B Thumb instructions.  */
 static int
 thumb_copy_b (struct gdbarch *gdbarch, uint16_t insn,
-	      arm_displaced_step_closure *dsc)
+	      arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int cond = 0;
   int offset = 0;
@@ -5129,7 +5129,7 @@ thumb_copy_b (struct gdbarch *gdbarch, uint16_t insn,
 
 static void
 install_bx_blx_reg (struct gdbarch *gdbarch, struct regcache *regs,
-		    arm_displaced_step_closure *dsc, int link,
+		    arm_displaced_step_copy_insn_closure *dsc, int link,
 		    unsigned int cond, unsigned int rm)
 {
   /* Implement {BX,BLX}<cond> <reg>" as:
@@ -5152,7 +5152,7 @@ install_bx_blx_reg (struct gdbarch *gdbarch, struct regcache *regs,
 
 static int
 arm_copy_bx_blx_reg (struct gdbarch *gdbarch, uint32_t insn,
-		     struct regcache *regs, arm_displaced_step_closure *dsc)
+		     regcache *regs, arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int cond = bits (insn, 28, 31);
   /* BX:  x12xxx1x
@@ -5171,7 +5171,7 @@ arm_copy_bx_blx_reg (struct gdbarch *gdbarch, uint32_t insn,
 static int
 thumb_copy_bx_blx_reg (struct gdbarch *gdbarch, uint16_t insn,
 		       struct regcache *regs,
-		       arm_displaced_step_closure *dsc)
+		       arm_displaced_step_copy_insn_closure *dsc)
 {
   int link = bit (insn, 7);
   unsigned int rm = bits (insn, 3, 6);
@@ -5190,7 +5190,7 @@ thumb_copy_bx_blx_reg (struct gdbarch *gdbarch, uint16_t insn,
 
 static void
 cleanup_alu_imm (struct gdbarch *gdbarch,
-		 struct regcache *regs, arm_displaced_step_closure *dsc)
+		 regcache *regs, arm_displaced_step_copy_insn_closure *dsc)
 {
   ULONGEST rd_val = displaced_read_reg (regs, dsc, 0);
   displaced_write_reg (regs, dsc, 0, dsc->tmp[0], CANNOT_WRITE_PC);
@@ -5200,7 +5200,7 @@ cleanup_alu_imm (struct gdbarch *gdbarch,
 
 static int
 arm_copy_alu_imm (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs,
-		  arm_displaced_step_closure *dsc)
+		  arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int rn = bits (insn, 16, 19);
   unsigned int rd = bits (insn, 12, 15);
@@ -5248,7 +5248,7 @@ arm_copy_alu_imm (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs,
 static int
 thumb2_copy_alu_imm (struct gdbarch *gdbarch, uint16_t insn1,
 		     uint16_t insn2, struct regcache *regs,
-		     arm_displaced_step_closure *dsc)
+		     arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int op = bits (insn1, 5, 8);
   unsigned int rn, rm, rd;
@@ -5299,7 +5299,7 @@ thumb2_copy_alu_imm (struct gdbarch *gdbarch, uint16_t insn1,
 
 static void
 cleanup_alu_reg (struct gdbarch *gdbarch,
-		 struct regcache *regs, arm_displaced_step_closure *dsc)
+		 regcache *regs, arm_displaced_step_copy_insn_closure *dsc)
 {
   ULONGEST rd_val;
   int i;
@@ -5314,7 +5314,7 @@ cleanup_alu_reg (struct gdbarch *gdbarch,
 
 static void
 install_alu_reg (struct gdbarch *gdbarch, struct regcache *regs,
-		 arm_displaced_step_closure *dsc,
+		 arm_displaced_step_copy_insn_closure *dsc,
 		 unsigned int rd, unsigned int rn, unsigned int rm)
 {
   ULONGEST rd_val, rn_val, rm_val;
@@ -5347,7 +5347,7 @@ install_alu_reg (struct gdbarch *gdbarch, struct regcache *regs,
 
 static int
 arm_copy_alu_reg (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs,
-		  arm_displaced_step_closure *dsc)
+		  arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int op = bits (insn, 21, 24);
   int is_mov = (op == 0xd);
@@ -5371,7 +5371,7 @@ arm_copy_alu_reg (struct gdbarch *gdbarch, uint32_t insn, struct regcache *regs,
 static int
 thumb_copy_alu_reg (struct gdbarch *gdbarch, uint16_t insn,
 		    struct regcache *regs,
-		    arm_displaced_step_closure *dsc)
+		    arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned rm, rd;
 
@@ -5395,7 +5395,7 @@ thumb_copy_alu_reg (struct gdbarch *gdbarch, uint16_t insn,
 static void
 cleanup_alu_shifted_reg (struct gdbarch *gdbarch,
 			 struct regcache *regs,
-			 arm_displaced_step_closure *dsc)
+			 arm_displaced_step_copy_insn_closure *dsc)
 {
   ULONGEST rd_val = displaced_read_reg (regs, dsc, 0);
   int i;
@@ -5408,7 +5408,7 @@ cleanup_alu_shifted_reg (struct gdbarch *gdbarch,
 
 static void
 install_alu_shifted_reg (struct gdbarch *gdbarch, struct regcache *regs,
-			 arm_displaced_step_closure *dsc,
+			 arm_displaced_step_copy_insn_closure *dsc,
 			 unsigned int rd, unsigned int rn, unsigned int rm,
 			 unsigned rs)
 {
@@ -5447,7 +5447,7 @@ install_alu_shifted_reg (struct gdbarch *gdbarch, struct regcache *regs,
 static int
 arm_copy_alu_shifted_reg (struct gdbarch *gdbarch, uint32_t insn,
 			  struct regcache *regs,
-			  arm_displaced_step_closure *dsc)
+			  arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int op = bits (insn, 21, 24);
   int is_mov = (op == 0xd);
@@ -5479,7 +5479,7 @@ arm_copy_alu_shifted_reg (struct gdbarch *gdbarch, uint32_t insn,
 
 static void
 cleanup_load (struct gdbarch *gdbarch, struct regcache *regs,
-	      arm_displaced_step_closure *dsc)
+	      arm_displaced_step_copy_insn_closure *dsc)
 {
   ULONGEST rt_val, rt_val2 = 0, rn_val;
 
@@ -5508,7 +5508,7 @@ cleanup_load (struct gdbarch *gdbarch, struct regcache *regs,
 
 static void
 cleanup_store (struct gdbarch *gdbarch, struct regcache *regs,
-	       arm_displaced_step_closure *dsc)
+	       arm_displaced_step_copy_insn_closure *dsc)
 {
   ULONGEST rn_val = displaced_read_reg (regs, dsc, 2);
 
@@ -5531,7 +5531,7 @@ cleanup_store (struct gdbarch *gdbarch, struct regcache *regs,
 
 static int
 arm_copy_extra_ld_st (struct gdbarch *gdbarch, uint32_t insn, int unprivileged,
-		      struct regcache *regs, arm_displaced_step_closure *dsc)
+		      regcache *regs, arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int op1 = bits (insn, 20, 24);
   unsigned int op2 = bits (insn, 5, 6);
@@ -5604,7 +5604,7 @@ arm_copy_extra_ld_st (struct gdbarch *gdbarch, uint32_t insn, int unprivileged,
 
 static void
 install_load_store (struct gdbarch *gdbarch, struct regcache *regs,
-		    arm_displaced_step_closure *dsc, int load,
+		    arm_displaced_step_copy_insn_closure *dsc, int load,
 		    int immed, int writeback, int size, int usermode,
 		    int rt, int rm, int rn)
 {
@@ -5660,7 +5660,7 @@ install_load_store (struct gdbarch *gdbarch, struct regcache *regs,
 static int
 thumb2_copy_load_literal (struct gdbarch *gdbarch, uint16_t insn1,
 			  uint16_t insn2, struct regcache *regs,
-			  arm_displaced_step_closure *dsc, int size)
+			  arm_displaced_step_copy_insn_closure *dsc, int size)
 {
   unsigned int u_bit = bit (insn1, 7);
   unsigned int rt = bits (insn2, 12, 15);
@@ -5714,7 +5714,7 @@ thumb2_copy_load_literal (struct gdbarch *gdbarch, uint16_t insn1,
 static int
 thumb2_copy_load_reg_imm (struct gdbarch *gdbarch, uint16_t insn1,
 			  uint16_t insn2, struct regcache *regs,
-			  arm_displaced_step_closure *dsc,
+			  arm_displaced_step_copy_insn_closure *dsc,
 			  int writeback, int immed)
 {
   unsigned int rt = bits (insn2, 12, 15);
@@ -5761,7 +5761,7 @@ thumb2_copy_load_reg_imm (struct gdbarch *gdbarch, uint16_t insn1,
 static int
 arm_copy_ldr_str_ldrb_strb (struct gdbarch *gdbarch, uint32_t insn,
 			    struct regcache *regs,
-			    arm_displaced_step_closure *dsc,
+			    arm_displaced_step_copy_insn_closure *dsc,
 			    int load, int size, int usermode)
 {
   int immed = !bit (insn, 25);
@@ -5844,7 +5844,7 @@ arm_copy_ldr_str_ldrb_strb (struct gdbarch *gdbarch, uint32_t insn,
 
 static void
 cleanup_block_load_all (struct gdbarch *gdbarch, struct regcache *regs,
-			arm_displaced_step_closure *dsc)
+			arm_displaced_step_copy_insn_closure *dsc)
 {
   int inc = dsc->u.block.increment;
   int bump_before = dsc->u.block.before ? (inc ? 4 : -4) : 0;
@@ -5904,7 +5904,7 @@ cleanup_block_load_all (struct gdbarch *gdbarch, struct regcache *regs,
 
 static void
 cleanup_block_store_pc (struct gdbarch *gdbarch, struct regcache *regs,
-			arm_displaced_step_closure *dsc)
+			arm_displaced_step_copy_insn_closure *dsc)
 {
   uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM);
   int store_executed = condition_true (dsc->u.block.cond, status);
@@ -5955,7 +5955,7 @@ cleanup_block_store_pc (struct gdbarch *gdbarch, struct regcache *regs,
 static void
 cleanup_block_load_pc (struct gdbarch *gdbarch,
 		       struct regcache *regs,
-		       arm_displaced_step_closure *dsc)
+		       arm_displaced_step_copy_insn_closure *dsc)
 {
   uint32_t status = displaced_read_reg (regs, dsc, ARM_PS_REGNUM);
   int load_executed = condition_true (dsc->u.block.cond, status);
@@ -6031,7 +6031,7 @@ cleanup_block_load_pc (struct gdbarch *gdbarch,
 static int
 arm_copy_block_xfer (struct gdbarch *gdbarch, uint32_t insn,
 		     struct regcache *regs,
-		     arm_displaced_step_closure *dsc)
+		     arm_displaced_step_copy_insn_closure *dsc)
 {
   int load = bit (insn, 20);
   int user = bit (insn, 22);
@@ -6143,7 +6143,7 @@ arm_copy_block_xfer (struct gdbarch *gdbarch, uint32_t insn,
 static int
 thumb2_copy_block_xfer (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2,
 			struct regcache *regs,
-			arm_displaced_step_closure *dsc)
+			arm_displaced_step_copy_insn_closure *dsc)
 {
   int rn = bits (insn1, 0, 3);
   int load = bit (insn1, 4);
@@ -6287,7 +6287,7 @@ arm_software_single_step (struct regcache *regcache)
 
 static void
 cleanup_svc (struct gdbarch *gdbarch, struct regcache *regs,
-	     arm_displaced_step_closure *dsc)
+	     arm_displaced_step_copy_insn_closure *dsc)
 {
   CORE_ADDR resume_addr = dsc->insn_addr + dsc->insn_size;
 
@@ -6302,7 +6302,7 @@ cleanup_svc (struct gdbarch *gdbarch, struct regcache *regs,
 
 static int
 install_svc (struct gdbarch *gdbarch, struct regcache *regs,
-	     arm_displaced_step_closure *dsc)
+	     arm_displaced_step_copy_insn_closure *dsc)
 {
   /* Preparation: none.
      Insn: unmodified svc.
@@ -6324,7 +6324,7 @@ install_svc (struct gdbarch *gdbarch, struct regcache *regs,
 
 static int
 arm_copy_svc (struct gdbarch *gdbarch, uint32_t insn,
-	      struct regcache *regs, arm_displaced_step_closure *dsc)
+	      regcache *regs, arm_displaced_step_copy_insn_closure *dsc)
 {
 
   displaced_debug_printf ("copying svc insn %.8lx",
@@ -6337,7 +6337,7 @@ arm_copy_svc (struct gdbarch *gdbarch, uint32_t insn,
 
 static int
 thumb_copy_svc (struct gdbarch *gdbarch, uint16_t insn,
-		struct regcache *regs, arm_displaced_step_closure *dsc)
+		regcache *regs, arm_displaced_step_copy_insn_closure *dsc)
 {
 
   displaced_debug_printf ("copying svc insn %.4x", insn);
@@ -6351,7 +6351,7 @@ thumb_copy_svc (struct gdbarch *gdbarch, uint16_t insn,
 
 static int
 arm_copy_undef (struct gdbarch *gdbarch, uint32_t insn,
-		arm_displaced_step_closure *dsc)
+		arm_displaced_step_copy_insn_closure *dsc)
 {
   displaced_debug_printf ("copying undefined insn %.8lx",
 			  (unsigned long) insn);
@@ -6363,7 +6363,7 @@ arm_copy_undef (struct gdbarch *gdbarch, uint32_t insn,
 
 static int
 thumb_32bit_copy_undef (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2,
-		       arm_displaced_step_closure *dsc)
+			arm_displaced_step_copy_insn_closure *dsc)
 {
 
   displaced_debug_printf ("copying undefined insn %.4x %.4x",
@@ -6380,7 +6380,7 @@ thumb_32bit_copy_undef (struct gdbarch *gdbarch, uint16_t insn1, uint16_t insn2,
 
 static int
 arm_copy_unpred (struct gdbarch *gdbarch, uint32_t insn,
-		 arm_displaced_step_closure *dsc)
+		 arm_displaced_step_copy_insn_closure *dsc)
 {
   displaced_debug_printf ("copying unpredictable insn %.8lx",
 			  (unsigned long) insn);
@@ -6396,7 +6396,7 @@ arm_copy_unpred (struct gdbarch *gdbarch, uint32_t insn,
 static int
 arm_decode_misc_memhint_neon (struct gdbarch *gdbarch, uint32_t insn,
 			      struct regcache *regs,
-			      arm_displaced_step_closure *dsc)
+			      arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int op1 = bits (insn, 20, 26), op2 = bits (insn, 4, 7);
   unsigned int rn = bits (insn, 16, 19);
@@ -6456,7 +6456,7 @@ arm_decode_misc_memhint_neon (struct gdbarch *gdbarch, uint32_t insn,
 static int
 arm_decode_unconditional (struct gdbarch *gdbarch, uint32_t insn,
 			  struct regcache *regs,
-			  arm_displaced_step_closure *dsc)
+			  arm_displaced_step_copy_insn_closure *dsc)
 {
   if (bit (insn, 27) == 0)
     return arm_decode_misc_memhint_neon (gdbarch, insn, regs, dsc);
@@ -6541,7 +6541,7 @@ arm_decode_unconditional (struct gdbarch *gdbarch, uint32_t insn,
 static int
 arm_decode_miscellaneous (struct gdbarch *gdbarch, uint32_t insn,
 			  struct regcache *regs,
-			  arm_displaced_step_closure *dsc)
+			  arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int op2 = bits (insn, 4, 6);
   unsigned int op = bits (insn, 21, 22);
@@ -6592,7 +6592,7 @@ arm_decode_miscellaneous (struct gdbarch *gdbarch, uint32_t insn,
 static int
 arm_decode_dp_misc (struct gdbarch *gdbarch, uint32_t insn,
 		    struct regcache *regs,
-		    arm_displaced_step_closure *dsc)
+		    arm_displaced_step_copy_insn_closure *dsc)
 {
   if (bit (insn, 25))
     switch (bits (insn, 20, 24))
@@ -6638,7 +6638,7 @@ arm_decode_dp_misc (struct gdbarch *gdbarch, uint32_t insn,
 static int
 arm_decode_ld_st_word_ubyte (struct gdbarch *gdbarch, uint32_t insn,
 			     struct regcache *regs,
-			     arm_displaced_step_closure *dsc)
+			     arm_displaced_step_copy_insn_closure *dsc)
 {
   int a = bit (insn, 25), b = bit (insn, 4);
   uint32_t op1 = bits (insn, 20, 24);
@@ -6674,7 +6674,7 @@ arm_decode_ld_st_word_ubyte (struct gdbarch *gdbarch, uint32_t insn,
 
 static int
 arm_decode_media (struct gdbarch *gdbarch, uint32_t insn,
-		  arm_displaced_step_closure *dsc)
+		  arm_displaced_step_copy_insn_closure *dsc)
 {
   switch (bits (insn, 20, 24))
     {
@@ -6731,7 +6731,7 @@ arm_decode_media (struct gdbarch *gdbarch, uint32_t insn,
 static int
 arm_decode_b_bl_ldmstm (struct gdbarch *gdbarch, uint32_t insn,
 			struct regcache *regs,
-			arm_displaced_step_closure *dsc)
+			arm_displaced_step_copy_insn_closure *dsc)
 {
   if (bit (insn, 25))
     return arm_copy_b_bl_blx (gdbarch, insn, regs, dsc);
@@ -6742,7 +6742,7 @@ arm_decode_b_bl_ldmstm (struct gdbarch *gdbarch, uint32_t insn,
 static int
 arm_decode_ext_reg_ld_st (struct gdbarch *gdbarch, uint32_t insn,
 			  struct regcache *regs,
-			  arm_displaced_step_closure *dsc)
+			  arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int opcode = bits (insn, 20, 24);
 
@@ -6775,7 +6775,7 @@ arm_decode_ext_reg_ld_st (struct gdbarch *gdbarch, uint32_t insn,
 static int
 thumb2_decode_dp_shift_reg (struct gdbarch *gdbarch, uint16_t insn1,
 			    uint16_t insn2,  struct regcache *regs,
-			    arm_displaced_step_closure *dsc)
+			    arm_displaced_step_copy_insn_closure *dsc)
 {
   /* PC is only allowed to be used in instruction MOV.  */
 
@@ -6796,7 +6796,7 @@ thumb2_decode_dp_shift_reg (struct gdbarch *gdbarch, uint16_t insn1,
 static int
 thumb2_decode_ext_reg_ld_st (struct gdbarch *gdbarch, uint16_t insn1,
 			     uint16_t insn2,  struct regcache *regs,
-			     arm_displaced_step_closure *dsc)
+			     arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int opcode = bits (insn1, 4, 8);
 
@@ -6831,7 +6831,7 @@ thumb2_decode_ext_reg_ld_st (struct gdbarch *gdbarch, uint16_t insn1,
 
 static int
 arm_decode_svc_copro (struct gdbarch *gdbarch, uint32_t insn,
-		      struct regcache *regs, arm_displaced_step_closure *dsc)
+		      regcache *regs, arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int op1 = bits (insn, 20, 25);
   int op = bit (insn, 4);
@@ -6877,7 +6877,7 @@ arm_decode_svc_copro (struct gdbarch *gdbarch, uint32_t insn,
 static int
 thumb2_decode_svc_copro (struct gdbarch *gdbarch, uint16_t insn1,
 			 uint16_t insn2, struct regcache *regs,
-			 arm_displaced_step_closure *dsc)
+			 arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int coproc = bits (insn2, 8, 11);
   unsigned int bit_5_8 = bits (insn1, 5, 8);
@@ -6917,7 +6917,7 @@ thumb2_decode_svc_copro (struct gdbarch *gdbarch, uint16_t insn1,
 
 static void
 install_pc_relative (struct gdbarch *gdbarch, struct regcache *regs,
-		     arm_displaced_step_closure *dsc, int rd)
+		     arm_displaced_step_copy_insn_closure *dsc, int rd)
 {
   /* ADR Rd, #imm
 
@@ -6935,7 +6935,7 @@ install_pc_relative (struct gdbarch *gdbarch, struct regcache *regs,
 
 static int
 thumb_copy_pc_relative_16bit (struct gdbarch *gdbarch, struct regcache *regs,
-			      arm_displaced_step_closure *dsc,
+			      arm_displaced_step_copy_insn_closure *dsc,
 			      int rd, unsigned int imm)
 {
 
@@ -6950,7 +6950,7 @@ thumb_copy_pc_relative_16bit (struct gdbarch *gdbarch, struct regcache *regs,
 static int
 thumb_decode_pc_relative_16bit (struct gdbarch *gdbarch, uint16_t insn,
 				struct regcache *regs,
-				arm_displaced_step_closure *dsc)
+				arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int rd = bits (insn, 8, 10);
   unsigned int imm8 = bits (insn, 0, 7);
@@ -6964,7 +6964,7 @@ thumb_decode_pc_relative_16bit (struct gdbarch *gdbarch, uint16_t insn,
 static int
 thumb_copy_pc_relative_32bit (struct gdbarch *gdbarch, uint16_t insn1,
 			      uint16_t insn2, struct regcache *regs,
-			      arm_displaced_step_closure *dsc)
+			      arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int rd = bits (insn2, 8, 11);
   /* Since immediate has the same encoding in ADR ADD and SUB, so we simply
@@ -6999,7 +6999,7 @@ thumb_copy_pc_relative_32bit (struct gdbarch *gdbarch, uint16_t insn1,
 static int
 thumb_copy_16bit_ldr_literal (struct gdbarch *gdbarch, uint16_t insn1,
 			      struct regcache *regs,
-			      arm_displaced_step_closure *dsc)
+			      arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned int rt = bits (insn1, 8, 10);
   unsigned int pc;
@@ -7046,7 +7046,7 @@ thumb_copy_16bit_ldr_literal (struct gdbarch *gdbarch, uint16_t insn1,
 static int
 thumb_copy_cbnz_cbz (struct gdbarch *gdbarch, uint16_t insn1,
 		     struct regcache *regs,
-		     arm_displaced_step_closure *dsc)
+		     arm_displaced_step_copy_insn_closure *dsc)
 {
   int non_zero = bit (insn1, 11);
   unsigned int imm5 = (bit (insn1, 9) << 6) | (bits (insn1, 3, 7) << 1);
@@ -7083,7 +7083,7 @@ thumb_copy_cbnz_cbz (struct gdbarch *gdbarch, uint16_t insn1,
 static int
 thumb2_copy_table_branch (struct gdbarch *gdbarch, uint16_t insn1,
 			  uint16_t insn2, struct regcache *regs,
-			  arm_displaced_step_closure *dsc)
+			  arm_displaced_step_copy_insn_closure *dsc)
 {
   ULONGEST rn_val, rm_val;
   int is_tbh = bit (insn2, 4);
@@ -7125,7 +7125,7 @@ thumb2_copy_table_branch (struct gdbarch *gdbarch, uint16_t insn1,
 
 static void
 cleanup_pop_pc_16bit_all (struct gdbarch *gdbarch, struct regcache *regs,
-			  arm_displaced_step_closure *dsc)
+			  arm_displaced_step_copy_insn_closure *dsc)
 {
   /* PC <- r7 */
   int val = displaced_read_reg (regs, dsc, 7);
@@ -7143,7 +7143,7 @@ cleanup_pop_pc_16bit_all (struct gdbarch *gdbarch, struct regcache *regs,
 static int
 thumb_copy_pop_pc_16bit (struct gdbarch *gdbarch, uint16_t insn1,
 			 struct regcache *regs,
-			 arm_displaced_step_closure *dsc)
+			 arm_displaced_step_copy_insn_closure *dsc)
 {
   dsc->u.block.regmask = insn1 & 0x00ff;
 
@@ -7212,7 +7212,7 @@ thumb_copy_pop_pc_16bit (struct gdbarch *gdbarch, uint16_t insn1,
 static void
 thumb_process_displaced_16bit_insn (struct gdbarch *gdbarch, uint16_t insn1,
 				    struct regcache *regs,
-				    arm_displaced_step_closure *dsc)
+				    arm_displaced_step_copy_insn_closure *dsc)
 {
   unsigned short op_bit_12_15 = bits (insn1, 12, 15);
   unsigned short op_bit_10_11 = bits (insn1, 10, 11);
@@ -7316,7 +7316,7 @@ static int
 decode_thumb_32bit_ld_mem_hints (struct gdbarch *gdbarch,
 				 uint16_t insn1, uint16_t insn2,
 				 struct regcache *regs,
-				 arm_displaced_step_closure *dsc)
+				 arm_displaced_step_copy_insn_closure *dsc)
 {
   int rt = bits (insn2, 12, 15);
   int rn = bits (insn1, 0, 3);
@@ -7395,7 +7395,7 @@ decode_thumb_32bit_ld_mem_hints (struct gdbarch *gdbarch,
 static void
 thumb_process_displaced_32bit_insn (struct gdbarch *gdbarch, uint16_t insn1,
 				    uint16_t insn2, struct regcache *regs,
-				    arm_displaced_step_closure *dsc)
+				    arm_displaced_step_copy_insn_closure *dsc)
 {
   int err = 0;
   unsigned short op = bit (insn2, 15);
@@ -7523,7 +7523,7 @@ thumb_process_displaced_32bit_insn (struct gdbarch *gdbarch, uint16_t insn1,
 static void
 thumb_process_displaced_insn (struct gdbarch *gdbarch, CORE_ADDR from,
 			      struct regcache *regs,
-			      arm_displaced_step_closure *dsc)
+			      arm_displaced_step_copy_insn_closure *dsc)
 {
   enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
   uint16_t insn1
@@ -7547,7 +7547,7 @@ thumb_process_displaced_insn (struct gdbarch *gdbarch, CORE_ADDR from,
 void
 arm_process_displaced_insn (struct gdbarch *gdbarch, CORE_ADDR from,
 			    CORE_ADDR to, struct regcache *regs,
-			    arm_displaced_step_closure *dsc)
+			    arm_displaced_step_copy_insn_closure *dsc)
 {
   int err = 0;
   enum bfd_endian byte_order_for_code = gdbarch_byte_order_for_code (gdbarch);
@@ -7604,7 +7604,8 @@ arm_process_displaced_insn (struct gdbarch *gdbarch, CORE_ADDR from,
 
 void
 arm_displaced_init_closure (struct gdbarch *gdbarch, CORE_ADDR from,
-			    CORE_ADDR to, arm_displaced_step_closure *dsc)
+			    CORE_ADDR to,
+			    arm_displaced_step_copy_insn_closure *dsc)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
   unsigned int i, len, offset;
@@ -7654,11 +7655,12 @@ arm_displaced_init_closure (struct gdbarch *gdbarch, CORE_ADDR from,
 
 void
 arm_displaced_step_fixup (struct gdbarch *gdbarch,
-			  struct displaced_step_closure *dsc_,
+			  struct displaced_step_copy_insn_closure *dsc_,
 			  CORE_ADDR from, CORE_ADDR to,
 			  struct regcache *regs)
 {
-  arm_displaced_step_closure *dsc = (arm_displaced_step_closure *) dsc_;
+  arm_displaced_step_copy_insn_closure *dsc
+    = (arm_displaced_step_copy_insn_closure *) dsc_;
 
   if (dsc->cleanup)
     dsc->cleanup (gdbarch, regs, dsc);
diff --git a/gdb/arm-tdep.h b/gdb/arm-tdep.h
index fd7e2ea..b1f52ff 100644
--- a/gdb/arm-tdep.h
+++ b/gdb/arm-tdep.h
@@ -149,7 +149,8 @@ struct gdbarch_tdep
    sequence) and any scratch words, etc.  */
 #define ARM_DISPLACED_MODIFIED_INSNS	8
 
-struct arm_displaced_step_closure : public displaced_step_closure
+struct arm_displaced_step_copy_insn_closure
+  : public displaced_step_copy_insn_closure
 {
   ULONGEST tmp[DISPLACED_TEMPS];
   int rd;
@@ -196,7 +197,7 @@ struct arm_displaced_step_closure : public displaced_step_closure
       /* If non-NULL, override generic SVC handling (e.g. for a particular
 	 OS).  */
       int (*copy_svc_os) (struct gdbarch *gdbarch, struct regcache *regs,
-			  arm_displaced_step_closure *dsc);
+			  arm_displaced_step_copy_insn_closure *dsc);
     } svc;
   } u;
 
@@ -215,7 +216,7 @@ struct arm_displaced_step_closure : public displaced_step_closure
   CORE_ADDR insn_addr;
   CORE_ADDR scratch_base;
   void (*cleanup) (struct gdbarch *, struct regcache *,
-		   arm_displaced_step_closure *);
+		   arm_displaced_step_copy_insn_closure *);
 };
 
 /* Values for the WRITE_PC argument to displaced_write_reg.  If the register
@@ -234,16 +235,17 @@ enum pc_write_style
 extern void
   arm_process_displaced_insn (struct gdbarch *gdbarch, CORE_ADDR from,
 			      CORE_ADDR to, struct regcache *regs,
-			      arm_displaced_step_closure *dsc);
+			      arm_displaced_step_copy_insn_closure *dsc);
 extern void
   arm_displaced_init_closure (struct gdbarch *gdbarch, CORE_ADDR from,
-			      CORE_ADDR to, arm_displaced_step_closure *dsc);
+			      CORE_ADDR to,
+			      arm_displaced_step_copy_insn_closure *dsc);
 extern ULONGEST
-  displaced_read_reg (struct regcache *regs, arm_displaced_step_closure *dsc,
+  displaced_read_reg (regcache *regs, arm_displaced_step_copy_insn_closure *dsc,
 		      int regno);
 extern void
   displaced_write_reg (struct regcache *regs,
-		       arm_displaced_step_closure *dsc, int regno,
+		       arm_displaced_step_copy_insn_closure *dsc, int regno,
 		       ULONGEST val, enum pc_write_style write_pc);
 
 CORE_ADDR arm_skip_stub (struct frame_info *, CORE_ADDR);
@@ -262,7 +264,7 @@ int arm_is_thumb (struct regcache *regcache);
 int arm_frame_is_thumb (struct frame_info *frame);
 
 extern void arm_displaced_step_fixup (struct gdbarch *,
-				      struct displaced_step_closure *,
+				      displaced_step_copy_insn_closure *,
 				      CORE_ADDR, CORE_ADDR, struct regcache *);
 
 /* Return the bit mask in ARM_PS_REGNUM that indicates Thumb mode.  */
diff --git a/gdb/gdbarch.c b/gdb/gdbarch.c
index cd93411..0ec626c 100644
--- a/gdb/gdbarch.c
+++ b/gdb/gdbarch.c
@@ -3969,7 +3969,7 @@ gdbarch_displaced_step_copy_insn_p (struct gdbarch *gdbarch)
   return gdbarch->displaced_step_copy_insn != NULL;
 }
 
-displaced_step_closure_up
+displaced_step_copy_insn_closure_up
 gdbarch_displaced_step_copy_insn (struct gdbarch *gdbarch, CORE_ADDR from, CORE_ADDR to, struct regcache *regs)
 {
   gdb_assert (gdbarch != NULL);
@@ -4011,7 +4011,7 @@ gdbarch_displaced_step_fixup_p (struct gdbarch *gdbarch)
 }
 
 void
-gdbarch_displaced_step_fixup (struct gdbarch *gdbarch, struct displaced_step_closure *closure, CORE_ADDR from, CORE_ADDR to, struct regcache *regs)
+gdbarch_displaced_step_fixup (struct gdbarch *gdbarch, struct displaced_step_copy_insn_closure *closure, CORE_ADDR from, CORE_ADDR to, struct regcache *regs)
 {
   gdb_assert (gdbarch != NULL);
   gdb_assert (gdbarch->displaced_step_fixup != NULL);
diff --git a/gdb/gdbarch.h b/gdb/gdbarch.h
index 70bd8a6..4f52e8c 100644
--- a/gdb/gdbarch.h
+++ b/gdb/gdbarch.h
@@ -1030,8 +1030,8 @@ extern void set_gdbarch_max_insn_length (struct gdbarch *gdbarch, ULONGEST max_i
 
 extern bool gdbarch_displaced_step_copy_insn_p (struct gdbarch *gdbarch);
 
-typedef displaced_step_closure_up (gdbarch_displaced_step_copy_insn_ftype) (struct gdbarch *gdbarch, CORE_ADDR from, CORE_ADDR to, struct regcache *regs);
-extern displaced_step_closure_up gdbarch_displaced_step_copy_insn (struct gdbarch *gdbarch, CORE_ADDR from, CORE_ADDR to, struct regcache *regs);
+typedef displaced_step_copy_insn_closure_up (gdbarch_displaced_step_copy_insn_ftype) (struct gdbarch *gdbarch, CORE_ADDR from, CORE_ADDR to, struct regcache *regs);
+extern displaced_step_copy_insn_closure_up gdbarch_displaced_step_copy_insn (struct gdbarch *gdbarch, CORE_ADDR from, CORE_ADDR to, struct regcache *regs);
 extern void set_gdbarch_displaced_step_copy_insn (struct gdbarch *gdbarch, gdbarch_displaced_step_copy_insn_ftype *displaced_step_copy_insn);
 
 /* Return true if GDB should use hardware single-stepping to execute a displaced
@@ -1066,8 +1066,8 @@ extern void set_gdbarch_displaced_step_hw_singlestep (struct gdbarch *gdbarch, g
 
 extern bool gdbarch_displaced_step_fixup_p (struct gdbarch *gdbarch);
 
-typedef void (gdbarch_displaced_step_fixup_ftype) (struct gdbarch *gdbarch, struct displaced_step_closure *closure, CORE_ADDR from, CORE_ADDR to, struct regcache *regs);
-extern void gdbarch_displaced_step_fixup (struct gdbarch *gdbarch, struct displaced_step_closure *closure, CORE_ADDR from, CORE_ADDR to, struct regcache *regs);
+typedef void (gdbarch_displaced_step_fixup_ftype) (struct gdbarch *gdbarch, struct displaced_step_copy_insn_closure *closure, CORE_ADDR from, CORE_ADDR to, struct regcache *regs);
+extern void gdbarch_displaced_step_fixup (struct gdbarch *gdbarch, struct displaced_step_copy_insn_closure *closure, CORE_ADDR from, CORE_ADDR to, struct regcache *regs);
 extern void set_gdbarch_displaced_step_fixup (struct gdbarch *gdbarch, gdbarch_displaced_step_fixup_ftype *displaced_step_fixup);
 
 /* Return the address of an appropriate place to put displaced
diff --git a/gdb/gdbarch.sh b/gdb/gdbarch.sh
index 86f2c79..f67ec9d 100755
--- a/gdb/gdbarch.sh
+++ b/gdb/gdbarch.sh
@@ -783,7 +783,7 @@ V;ULONGEST;max_insn_length;;;0;0
 # If the instruction cannot execute out of line, return NULL.  The
 # core falls back to stepping past the instruction in-line instead in
 # that case.
-M;displaced_step_closure_up;displaced_step_copy_insn;CORE_ADDR from, CORE_ADDR to, struct regcache *regs;from, to, regs
+M;displaced_step_copy_insn_closure_up;displaced_step_copy_insn;CORE_ADDR from, CORE_ADDR to, struct regcache *regs;from, to, regs
 
 # Return true if GDB should use hardware single-stepping to execute a displaced
 # step instruction.  If false, GDB will simply restart execution at the
@@ -811,7 +811,7 @@ m;bool;displaced_step_hw_singlestep;void;;;default_displaced_step_hw_singlestep;
 #
 # For a general explanation of displaced stepping and how GDB uses it,
 # see the comments in infrun.c.
-M;void;displaced_step_fixup;struct displaced_step_closure *closure, CORE_ADDR from, CORE_ADDR to, struct regcache *regs;closure, from, to, regs;;NULL
+M;void;displaced_step_fixup;struct displaced_step_copy_insn_closure *closure, CORE_ADDR from, CORE_ADDR to, struct regcache *regs;closure, from, to, regs;;NULL
 
 # Return the address of an appropriate place to put displaced
 # instructions while we step over them.  There need only be one such
diff --git a/gdb/i386-linux-tdep.c b/gdb/i386-linux-tdep.c
index b9ec958..ab7d236 100644
--- a/gdb/i386-linux-tdep.c
+++ b/gdb/i386-linux-tdep.c
@@ -789,29 +789,30 @@ i386_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
    PC should get relocated back to its vDSO address.  Hide the 'ret'
    instruction by 'nop' so that i386_displaced_step_fixup is not confused.
    
-   It is not fully correct as the bytes in struct displaced_step_closure will
-   not match the inferior code.  But we would need some new flag in
-   displaced_step_closure otherwise to keep the state that syscall is finishing
-   for the later i386_displaced_step_fixup execution as the syscall execution
-   is already no longer detectable there.  The new flag field would mean
-   i386-linux-tdep.c needs to wrap all the displacement methods of i386-tdep.c
-   which does not seem worth it.  The same effect is achieved by patching that
-   'nop' instruction there instead.  */
-
-static displaced_step_closure_up
+   It is not fully correct as the bytes in struct
+   displaced_step_copy_insn_closure will not match the inferior code.  But we
+   would need some new flag in displaced_step_copy_insn_closure otherwise to
+   keep the state that syscall is finishing for the later
+   i386_displaced_step_fixup execution as the syscall execution is already no
+   longer detectable there.  The new flag field would mean i386-linux-tdep.c
+   needs to wrap all the displacement methods of i386-tdep.c which does not seem
+   worth it.  The same effect is achieved by patching that 'nop' instruction
+   there instead.  */
+
+static displaced_step_copy_insn_closure_up
 i386_linux_displaced_step_copy_insn (struct gdbarch *gdbarch,
 				     CORE_ADDR from, CORE_ADDR to,
 				     struct regcache *regs)
 {
-  displaced_step_closure_up closure_
+  displaced_step_copy_insn_closure_up closure_
     =  i386_displaced_step_copy_insn (gdbarch, from, to, regs);
 
   if (i386_linux_get_syscall_number_from_regcache (regs) != -1)
     {
       /* The closure returned by i386_displaced_step_copy_insn is simply a
 	 buffer with a copy of the instruction. */
-      i386_displaced_step_closure *closure
-	= (i386_displaced_step_closure *) closure_.get ();
+      i386_displaced_step_copy_insn_closure *closure
+	= (i386_displaced_step_copy_insn_closure *) closure_.get ();
 
       /* Fake nop.  */
       closure->buf[0] = 0x90;
diff --git a/gdb/i386-tdep.c b/gdb/i386-tdep.c
index ad02ad6..d59008b 100644
--- a/gdb/i386-tdep.c
+++ b/gdb/i386-tdep.c
@@ -799,14 +799,14 @@ i386_insn_is_jump (struct gdbarch *gdbarch, CORE_ADDR addr)
 
 /* Some kernels may run one past a syscall insn, so we have to cope.  */
 
-displaced_step_closure_up
+displaced_step_copy_insn_closure_up
 i386_displaced_step_copy_insn (struct gdbarch *gdbarch,
 			       CORE_ADDR from, CORE_ADDR to,
 			       struct regcache *regs)
 {
   size_t len = gdbarch_max_insn_length (gdbarch);
-  std::unique_ptr<i386_displaced_step_closure> closure
-    (new i386_displaced_step_closure (len));
+  std::unique_ptr<i386_displaced_step_copy_insn_closure> closure
+    (new i386_displaced_step_copy_insn_closure (len));
   gdb_byte *buf = closure->buf.data ();
 
   read_memory (from, buf, len);
@@ -830,7 +830,7 @@ i386_displaced_step_copy_insn (struct gdbarch *gdbarch,
 			  displaced_step_dump_bytes (buf, len).c_str ());
 
   /* This is a work around for a problem with g++ 4.8.  */
-  return displaced_step_closure_up (closure.release ());
+  return displaced_step_copy_insn_closure_up (closure.release ());
 }
 
 /* Fix up the state of registers and memory after having single-stepped
@@ -838,7 +838,7 @@ i386_displaced_step_copy_insn (struct gdbarch *gdbarch,
 
 void
 i386_displaced_step_fixup (struct gdbarch *gdbarch,
-			   struct displaced_step_closure *closure_,
+			   struct displaced_step_copy_insn_closure *closure_,
 			   CORE_ADDR from, CORE_ADDR to,
 			   struct regcache *regs)
 {
@@ -850,8 +850,8 @@ i386_displaced_step_fixup (struct gdbarch *gdbarch,
      applying it.  */
   ULONGEST insn_offset = to - from;
 
-  i386_displaced_step_closure *closure
-    = (i386_displaced_step_closure *) closure_;
+  i386_displaced_step_copy_insn_closure *closure
+    = (i386_displaced_step_copy_insn_closure *) closure_;
   gdb_byte *insn = closure->buf.data ();
   /* The start of the insn, needed in case we see some prefixes.  */
   gdb_byte *insn_start = insn;
diff --git a/gdb/i386-tdep.h b/gdb/i386-tdep.h
index 45d64eb..f8a93b1 100644
--- a/gdb/i386-tdep.h
+++ b/gdb/i386-tdep.h
@@ -439,15 +439,15 @@ extern void
 				     void *cb_data,
 				     const struct regcache *regcache);
 
-typedef buf_displaced_step_closure i386_displaced_step_closure;
+typedef buf_displaced_step_copy_insn_closure
+  i386_displaced_step_copy_insn_closure;
 
-extern displaced_step_closure_up i386_displaced_step_copy_insn
+extern displaced_step_copy_insn_closure_up i386_displaced_step_copy_insn
   (struct gdbarch *gdbarch, CORE_ADDR from, CORE_ADDR to,
    struct regcache *regs);
-extern void i386_displaced_step_fixup (struct gdbarch *gdbarch,
-				       struct displaced_step_closure *closure,
-				       CORE_ADDR from, CORE_ADDR to,
-				       struct regcache *regs);
+extern void i386_displaced_step_fixup
+  (struct gdbarch *gdbarch, displaced_step_copy_insn_closure *closure,
+   CORE_ADDR from, CORE_ADDR to, regcache *regs);
 
 /* Initialize a basic ELF architecture variant.  */
 extern void i386_elf_init_abi (struct gdbarch_info, struct gdbarch *);
diff --git a/gdb/infrun.c b/gdb/infrun.c
index b965e70..175d095 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -1459,9 +1459,10 @@ step_over_info_valid_p (void)
    displaced step operation on it.  See displaced_step_prepare and
    displaced_step_fixup for details.  */
 
-/* Default destructor for displaced_step_closure.  */
+/* Default destructor for displaced_step_copy_insn_closure.  */
 
-displaced_step_closure::~displaced_step_closure () = default;
+displaced_step_copy_insn_closure::~displaced_step_copy_insn_closure ()
+  = default;
 
 /* Returns true if any inferior has a thread doing a displaced
    step.  */
@@ -1497,11 +1498,11 @@ displaced_step_in_progress (inferior *inf)
 }
 
 /* If inferior is in displaced stepping, and ADDR equals to starting address
-   of copy area, return corresponding displaced_step_closure.  Otherwise,
-   return NULL.  */
+   of copy area, return corresponding displaced_step_copy_insn_closure.
+   Otherwise, return NULL.  */
 
-struct displaced_step_closure*
-get_displaced_step_closure_by_addr (CORE_ADDR addr)
+displaced_step_copy_insn_closure *
+get_displaced_step_copy_insn_closure_by_addr (CORE_ADDR addr)
 {
   displaced_step_inferior_state &displaced
     = current_inferior ()->displaced_step_state;
diff --git a/gdb/infrun.h b/gdb/infrun.h
index ca0774e..a276ddf 100644
--- a/gdb/infrun.h
+++ b/gdb/infrun.h
@@ -239,8 +239,8 @@ extern void clear_exit_convenience_vars (void);
 /* Dump LEN bytes at BUF in hex to a string and return it.  */
 extern std::string displaced_step_dump_bytes (const gdb_byte *buf, size_t len);
 
-extern struct displaced_step_closure *get_displaced_step_closure_by_addr
-    (CORE_ADDR addr);
+extern struct displaced_step_copy_insn_closure *
+  get_displaced_step_copy_insn_closure_by_addr (CORE_ADDR addr);
 
 extern void update_observer_mode (void);
 
@@ -282,18 +282,19 @@ extern void all_uis_on_sync_execution_starting (void);
 
 /* Base class for displaced stepping closures (the arch-specific data).  */
 
-struct displaced_step_closure
+struct displaced_step_copy_insn_closure
 {
-  virtual ~displaced_step_closure () = 0;
+  virtual ~displaced_step_copy_insn_closure () = 0;
 };
 
-using displaced_step_closure_up = std::unique_ptr<displaced_step_closure>;
+using displaced_step_copy_insn_closure_up
+  = std::unique_ptr<displaced_step_copy_insn_closure>;
 
 /* A simple displaced step closure that contains only a byte buffer.  */
 
-struct buf_displaced_step_closure : displaced_step_closure
+struct buf_displaced_step_copy_insn_closure : displaced_step_copy_insn_closure
 {
-  buf_displaced_step_closure (int buf_size)
+  buf_displaced_step_copy_insn_closure (int buf_size)
   : buf (buf_size)
   {}
 
@@ -334,7 +335,7 @@ struct displaced_step_inferior_state
 
   /* The closure provided gdbarch_displaced_step_copy_insn, to be used
      for post-step cleanup.  */
-  displaced_step_closure_up step_closure;
+  displaced_step_copy_insn_closure_up step_closure;
 
   /* The address of the original instruction, and the copy we
      made.  */
diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c
index bde3ee7..626b47e 100644
--- a/gdb/rs6000-tdep.c
+++ b/gdb/rs6000-tdep.c
@@ -851,18 +851,19 @@ typedef BP_MANIPULATION_ENDIAN (little_breakpoint, big_breakpoint)
 					 || (insn & STORE_CONDITIONAL_MASK) == STHCX_INSTRUCTION \
 					 || (insn & STORE_CONDITIONAL_MASK) == STQCX_INSTRUCTION)
 
-typedef buf_displaced_step_closure ppc_displaced_step_closure;
+typedef buf_displaced_step_copy_insn_closure
+  ppc_displaced_step_copy_insn_closure;
 
 /* We can't displaced step atomic sequences.  */
 
-static displaced_step_closure_up
+static displaced_step_copy_insn_closure_up
 ppc_displaced_step_copy_insn (struct gdbarch *gdbarch,
 			      CORE_ADDR from, CORE_ADDR to,
 			      struct regcache *regs)
 {
   size_t len = gdbarch_max_insn_length (gdbarch);
-  std::unique_ptr<ppc_displaced_step_closure> closure
-    (new ppc_displaced_step_closure (len));
+  std::unique_ptr<ppc_displaced_step_copy_insn_closure> closure
+    (new ppc_displaced_step_copy_insn_closure (len));
   gdb_byte *buf = closure->buf.data ();
   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
   int insn;
@@ -887,20 +888,21 @@ ppc_displaced_step_copy_insn (struct gdbarch *gdbarch,
 			  displaced_step_dump_bytes (buf, len).c_str ());;
 
   /* This is a work around for a problem with g++ 4.8.  */
-  return displaced_step_closure_up (closure.release ());
+  return displaced_step_copy_insn_closure_up (closure.release ());
 }
 
 /* Fix up the state of registers and memory after having single-stepped
    a displaced instruction.  */
 static void
 ppc_displaced_step_fixup (struct gdbarch *gdbarch,
-			  struct displaced_step_closure *closure_,
+			  struct displaced_step_copy_insn_closure *closure_,
 			  CORE_ADDR from, CORE_ADDR to,
 			  struct regcache *regs)
 {
   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
   /* Our closure is a copy of the instruction.  */
-  ppc_displaced_step_closure *closure = (ppc_displaced_step_closure *) closure_;
+  ppc_displaced_step_copy_insn_closure *closure
+    = (ppc_displaced_step_copy_insn_closure *) closure_;
   ULONGEST insn  = extract_unsigned_integer (closure->buf.data (),
 					     PPC_INSN_SIZE, byte_order);
   ULONGEST opcode = 0;
diff --git a/gdb/s390-tdep.c b/gdb/s390-tdep.c
index 247adcd..5429d71 100644
--- a/gdb/s390-tdep.c
+++ b/gdb/s390-tdep.c
@@ -421,18 +421,19 @@ is_non_branch_ril (gdb_byte *insn)
   return 0;
 }
 
-typedef buf_displaced_step_closure s390_displaced_step_closure;
+typedef buf_displaced_step_copy_insn_closure
+  s390_displaced_step_copy_insn_closure;
 
 /* Implementation of gdbarch_displaced_step_copy_insn.  */
 
-static displaced_step_closure_up
+static displaced_step_copy_insn_closure_up
 s390_displaced_step_copy_insn (struct gdbarch *gdbarch,
 			       CORE_ADDR from, CORE_ADDR to,
 			       struct regcache *regs)
 {
   size_t len = gdbarch_max_insn_length (gdbarch);
-  std::unique_ptr<s390_displaced_step_closure> closure
-    (new s390_displaced_step_closure (len));
+  std::unique_ptr<s390_displaced_step_copy_insn_closure> closure
+    (new s390_displaced_step_copy_insn_closure (len));
   gdb_byte *buf = closure->buf.data ();
 
   read_memory (from, buf, len);
@@ -470,7 +471,7 @@ s390_displaced_step_copy_insn (struct gdbarch *gdbarch,
 			  displaced_step_dump_bytes (buf, len).c_str ());
 
   /* This is a work around for a problem with g++ 4.8.  */
-  return displaced_step_closure_up (closure.release ());
+  return displaced_step_copy_insn_closure_up (closure.release ());
 }
 
 /* Fix up the state of registers and memory after having single-stepped
@@ -478,13 +479,13 @@ s390_displaced_step_copy_insn (struct gdbarch *gdbarch,
 
 static void
 s390_displaced_step_fixup (struct gdbarch *gdbarch,
-			   struct displaced_step_closure *closure_,
+			   displaced_step_copy_insn_closure *closure_,
 			   CORE_ADDR from, CORE_ADDR to,
 			   struct regcache *regs)
 {
   /* Our closure is a copy of the instruction.  */
-  s390_displaced_step_closure *closure
-    = (s390_displaced_step_closure *) closure_;
+  s390_displaced_step_copy_insn_closure *closure
+    = (s390_displaced_step_copy_insn_closure *) closure_;
   gdb_byte *insn = closure->buf.data ();
   static int s390_instrlen[] = { 2, 4, 4, 6 };
   int insnlen = s390_instrlen[insn[0] >> 6];