Patchwork [02/10] class readable_regcache and pass readable_regcache to gdbarch pseudo_register_read and pseudo_register_read_value

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Submitter Yao Qi
Date Feb. 7, 2018, 10:32 a.m.
Message ID <1517999572-14987-3-git-send-email-yao.qi@linaro.org>
Download mbox | patch
Permalink /patch/25850/
State New
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Comments

Yao Qi - Feb. 7, 2018, 10:32 a.m.
pseudo registers are either from raw registers or memory, so
gdbarch methods pseudo_register_read and pseudo_register_read_value
should have regcache object which only have read methods.  In other
words, we should disallow writing to regcache in these two gdbarch
methods.  In order to apply this restriction, this patch adds a new
class readable_regcache, derived from reg_buffer, and it only has
raw_read and cooked_read methods.  regcache is derived from
readable_regcache.  This patch also passes readable_regcache instead of
regcache to gdbarch methods pseudo_register_read and
pseudo_register_read_value.

This patch moves raw_read* and cooked_read* methods to readable_regcache,
which is straightforward.  One thing not straightforward is that I split
regcache::xfer_part to readable_regcache::read_part and regcache::write_part,
because readable_regcache can only have methods to read.

readable_regcache is an abstract base class, and it has a pure virtual
function raw_update, because I don't want readable_regcache know where
these raw registers are from.  They can be from either the target
(readwrite regcache) or the regcache itself (readonly regcache).

gdb:

2017-11-29  Yao Qi  <yao.qi@linaro.org>

	* aarch64-tdep.c (aarch64_pseudo_register_read_value): Change
	parameter type to 'readable_regcache *'.
	* amd64-tdep.c (amd64_pseudo_register_read_value): Likewise.
	* arm-tdep.c (arm_neon_quad_read): Likewise.
	(arm_pseudo_read): Likewise.
	* avr-tdep.c (avr_pseudo_register_read): Likewise.
	* bfin-tdep.c (bfin_pseudo_register_read): Likewise.
	* frv-tdep.c (frv_pseudo_register_read): Likewise.
	* gdbarch.c: Re-generated.
	* gdbarch.h: Re-generated.
	* gdbarch.sh (pseudo_register_read): Change parameter type to
	'readable_regcache *'.
	(pseudo_register_read_value): Likewise.
	* h8300-tdep.c (pseudo_from_raw_register): Likewise.
	(h8300_pseudo_register_read): Likewise.
	* hppa-tdep.c (hppa_pseudo_register_read): Likewise.
	* i386-tdep.c (i386_mmx_regnum_to_fp_regnum): Likewise.
	(i386_pseudo_register_read_into_value): Likewise.
	(i386_pseudo_register_read_value): Likewise.
	* i386-tdep.h (i386_pseudo_register_read_into_value): Update
	declaration.
	* ia64-tdep.c (ia64_pseudo_register_read): Likewise.
	* m32c-tdep.c (m32c_raw_read): Likewise.
	(m32c_read_flg): Likewise.
	(m32c_banked_register): Likewise.
	(m32c_banked_read): Likewise.
	(m32c_sb_read): Likewise.
	(m32c_part_read): Likewise.
	(m32c_cat_read): Likewise.
	(m32c_r3r2r1r0_read): Likewise.
	(m32c_pseudo_register_read): Likewise.
	* m68hc11-tdep.c (m68hc11_pseudo_register_read): Likewise.
	* mep-tdep.c (mep_pseudo_cr32_read): Likewise.
	(mep_pseudo_cr64_read): Likewise.
	(mep_pseudo_register_read): Likewise.
	* mips-tdep.c (mips_pseudo_register_read): Likewise.
	* msp430-tdep.c (msp430_pseudo_register_read): Likewise.
	* nds32-tdep.c (nds32_pseudo_register_read): Likewise.
	* regcache.c (regcache::raw_read): Move it to readable_regcache.
	(regcache::cooked_read): Likewise.
	(regcache::cooked_read_value): Likewise.
	(regcache_cooked_read_signed):
	(regcache::cooked_read): Likewise.
	* regcache.h (readable_regcache): New class.
	(regcache): Inherit readable_regcache.  Move some methods to
	readable_regcache.
	* rl78-tdep.c (rl78_pseudo_register_read): Change
	parameter type to 'readable_regcache *'.
	* rs6000-tdep.c (do_regcache_raw_read): Remove.
	(e500_pseudo_register_read): Change parameter type to
	'readable_regcache *'.
	(dfp_pseudo_register_read): Likewise.
	(vsx_pseudo_register_read): Likewise.
	(efpr_pseudo_register_read): Likewise.
	* s390-tdep.c (s390_pseudo_register_read): Likewise.
	* sh-tdep.c (sh_pseudo_register_read): Likewise.
	* sh64-tdep.c (pseudo_register_read_portions): Likewise.
	(sh64_pseudo_register_read): Likewise.
	* sparc-tdep.c (sparc32_pseudo_register_read): Likewise.
	* sparc64-tdep.c (sparc64_pseudo_register_read): Likewise.
	* spu-tdep.c (spu_pseudo_register_read_spu): Likewise.
	(spu_pseudo_register_read): Likewise.
	* xtensa-tdep.c	(xtensa_register_read_masked): Likewise.
	(xtensa_pseudo_register_read): Likewise.
---
 gdb/aarch64-tdep.c |  2 +-
 gdb/amd64-tdep.c   |  2 +-
 gdb/arm-tdep.c     |  6 ++--
 gdb/avr-tdep.c     |  2 +-
 gdb/bfin-tdep.c    |  2 +-
 gdb/frv-tdep.c     |  2 +-
 gdb/gdbarch.c      |  4 +--
 gdb/gdbarch.h      |  8 +++---
 gdb/gdbarch.sh     |  4 +--
 gdb/h8300-tdep.c   |  4 +--
 gdb/hppa-tdep.c    |  2 +-
 gdb/i386-tdep.c    |  6 ++--
 gdb/i386-tdep.h    |  2 +-
 gdb/ia64-tdep.c    |  2 +-
 gdb/m32c-tdep.c    | 20 ++++++-------
 gdb/m68hc11-tdep.c |  2 +-
 gdb/mep-tdep.c     |  6 ++--
 gdb/mips-tdep.c    |  2 +-
 gdb/msp430-tdep.c  |  2 +-
 gdb/nds32-tdep.c   |  2 +-
 gdb/regcache.c     | 84 ++++++++++++++++++++++++++++++++++--------------------
 gdb/regcache.h     | 60 ++++++++++++++++++++++++--------------
 gdb/rl78-tdep.c    |  2 +-
 gdb/rs6000-tdep.c  | 52 ++++++++++++++++++++++-----------
 gdb/s390-tdep.c    |  2 +-
 gdb/sh-tdep.c      |  4 +--
 gdb/sh64-tdep.c    |  4 +--
 gdb/sparc-tdep.c   |  2 +-
 gdb/sparc64-tdep.c |  2 +-
 gdb/spu-tdep.c     |  4 +--
 gdb/xtensa-tdep.c  |  4 +--
 31 files changed, 180 insertions(+), 122 deletions(-)

Patch

diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c
index 6b59f03..f08945e 100644
--- a/gdb/aarch64-tdep.c
+++ b/gdb/aarch64-tdep.c
@@ -2225,7 +2225,7 @@  aarch64_pseudo_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 
 static struct value *
 aarch64_pseudo_read_value (struct gdbarch *gdbarch,
-			   struct regcache *regcache,
+			   readable_regcache *regcache,
 			   int regnum)
 {
   gdb_byte reg_buf[V_REGISTER_SIZE];
diff --git a/gdb/amd64-tdep.c b/gdb/amd64-tdep.c
index b589d93..6b92c92 100644
--- a/gdb/amd64-tdep.c
+++ b/gdb/amd64-tdep.c
@@ -347,7 +347,7 @@  amd64_pseudo_register_name (struct gdbarch *gdbarch, int regnum)
 
 static struct value *
 amd64_pseudo_register_read_value (struct gdbarch *gdbarch,
-				  struct regcache *regcache,
+				  readable_regcache *regcache,
 				  int regnum)
 {
   gdb_byte *raw_buf = (gdb_byte *) alloca (register_size (gdbarch, regnum));
diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c
index 8be0d4d..ef7e66b 100644
--- a/gdb/arm-tdep.c
+++ b/gdb/arm-tdep.c
@@ -227,7 +227,7 @@  static void show_disassembly_style_sfunc (struct ui_file *, int,
 					  const char *);
 
 static enum register_status arm_neon_quad_read (struct gdbarch *gdbarch,
-						struct regcache *regcache,
+						readable_regcache *regcache,
 						int regnum, gdb_byte *buf);
 static void arm_neon_quad_write (struct gdbarch *gdbarch,
 				 struct regcache *regcache,
@@ -8678,7 +8678,7 @@  arm_write_pc (struct regcache *regcache, CORE_ADDR pc)
    the quad register, in [0, 15].  */
 
 static enum register_status
-arm_neon_quad_read (struct gdbarch *gdbarch, struct regcache *regcache,
+arm_neon_quad_read (struct gdbarch *gdbarch, readable_regcache *regcache,
 		    int regnum, gdb_byte *buf)
 {
   char name_buf[4];
@@ -8711,7 +8711,7 @@  arm_neon_quad_read (struct gdbarch *gdbarch, struct regcache *regcache,
 }
 
 static enum register_status
-arm_pseudo_read (struct gdbarch *gdbarch, struct regcache *regcache,
+arm_pseudo_read (struct gdbarch *gdbarch, readable_regcache *regcache,
 		 int regnum, gdb_byte *buf)
 {
   const int num_regs = gdbarch_num_regs (gdbarch);
diff --git a/gdb/avr-tdep.c b/gdb/avr-tdep.c
index 177717f..7f88e8f 100644
--- a/gdb/avr-tdep.c
+++ b/gdb/avr-tdep.c
@@ -382,7 +382,7 @@  avr_write_pc (struct regcache *regcache, CORE_ADDR val)
 }
 
 static enum register_status
-avr_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+avr_pseudo_register_read (struct gdbarch *gdbarch, readable_regcache *regcache,
                           int regnum, gdb_byte *buf)
 {
   ULONGEST val;
diff --git a/gdb/bfin-tdep.c b/gdb/bfin-tdep.c
index db8de82..63fbf62 100644
--- a/gdb/bfin-tdep.c
+++ b/gdb/bfin-tdep.c
@@ -688,7 +688,7 @@  bfin_register_name (struct gdbarch *gdbarch, int i)
 }
 
 static enum register_status
-bfin_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+bfin_pseudo_register_read (struct gdbarch *gdbarch, readable_regcache *regcache,
 			   int regnum, gdb_byte *buffer)
 {
   gdb_byte buf[BFIN_MAX_REGISTER_SIZE];
diff --git a/gdb/frv-tdep.c b/gdb/frv-tdep.c
index b6906fa..2f9a8d2 100644
--- a/gdb/frv-tdep.c
+++ b/gdb/frv-tdep.c
@@ -295,7 +295,7 @@  frv_register_type (struct gdbarch *gdbarch, int reg)
 }
 
 static enum register_status
-frv_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+frv_pseudo_register_read (struct gdbarch *gdbarch, readable_regcache *regcache,
                           int reg, gdb_byte *buffer)
 {
   enum register_status status;
diff --git a/gdb/gdbarch.c b/gdb/gdbarch.c
index fe3c12e..705a6d3 100644
--- a/gdb/gdbarch.c
+++ b/gdb/gdbarch.c
@@ -1971,7 +1971,7 @@  gdbarch_pseudo_register_read_p (struct gdbarch *gdbarch)
 }
 
 enum register_status
-gdbarch_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache, int cookednum, gdb_byte *buf)
+gdbarch_pseudo_register_read (struct gdbarch *gdbarch, readable_regcache *regcache, int cookednum, gdb_byte *buf)
 {
   gdb_assert (gdbarch != NULL);
   gdb_assert (gdbarch->pseudo_register_read != NULL);
@@ -1995,7 +1995,7 @@  gdbarch_pseudo_register_read_value_p (struct gdbarch *gdbarch)
 }
 
 struct value *
-gdbarch_pseudo_register_read_value (struct gdbarch *gdbarch, struct regcache *regcache, int cookednum)
+gdbarch_pseudo_register_read_value (struct gdbarch *gdbarch, readable_regcache *regcache, int cookednum)
 {
   gdb_assert (gdbarch != NULL);
   gdb_assert (gdbarch->pseudo_register_read_value != NULL);
diff --git a/gdb/gdbarch.h b/gdb/gdbarch.h
index 5664c4d..249ad61 100644
--- a/gdb/gdbarch.h
+++ b/gdb/gdbarch.h
@@ -265,8 +265,8 @@  extern void set_gdbarch_virtual_frame_pointer (struct gdbarch *gdbarch, gdbarch_
 
 extern int gdbarch_pseudo_register_read_p (struct gdbarch *gdbarch);
 
-typedef enum register_status (gdbarch_pseudo_register_read_ftype) (struct gdbarch *gdbarch, struct regcache *regcache, int cookednum, gdb_byte *buf);
-extern enum register_status gdbarch_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache, int cookednum, gdb_byte *buf);
+typedef enum register_status (gdbarch_pseudo_register_read_ftype) (struct gdbarch *gdbarch, readable_regcache *regcache, int cookednum, gdb_byte *buf);
+extern enum register_status gdbarch_pseudo_register_read (struct gdbarch *gdbarch, readable_regcache *regcache, int cookednum, gdb_byte *buf);
 extern void set_gdbarch_pseudo_register_read (struct gdbarch *gdbarch, gdbarch_pseudo_register_read_ftype *pseudo_register_read);
 
 /* Read a register into a new struct value.  If the register is wholly
@@ -276,8 +276,8 @@  extern void set_gdbarch_pseudo_register_read (struct gdbarch *gdbarch, gdbarch_p
 
 extern int gdbarch_pseudo_register_read_value_p (struct gdbarch *gdbarch);
 
-typedef struct value * (gdbarch_pseudo_register_read_value_ftype) (struct gdbarch *gdbarch, struct regcache *regcache, int cookednum);
-extern struct value * gdbarch_pseudo_register_read_value (struct gdbarch *gdbarch, struct regcache *regcache, int cookednum);
+typedef struct value * (gdbarch_pseudo_register_read_value_ftype) (struct gdbarch *gdbarch, readable_regcache *regcache, int cookednum);
+extern struct value * gdbarch_pseudo_register_read_value (struct gdbarch *gdbarch, readable_regcache *regcache, int cookednum);
 extern void set_gdbarch_pseudo_register_read_value (struct gdbarch *gdbarch, gdbarch_pseudo_register_read_value_ftype *pseudo_register_read_value);
 
 extern int gdbarch_pseudo_register_write_p (struct gdbarch *gdbarch);
diff --git a/gdb/gdbarch.sh b/gdb/gdbarch.sh
index a929e13..8477dd7 100755
--- a/gdb/gdbarch.sh
+++ b/gdb/gdbarch.sh
@@ -429,12 +429,12 @@  F;void;write_pc;struct regcache *regcache, CORE_ADDR val;regcache, val
 # serious shakedown.
 m;void;virtual_frame_pointer;CORE_ADDR pc, int *frame_regnum, LONGEST *frame_offset;pc, frame_regnum, frame_offset;0;legacy_virtual_frame_pointer;;0
 #
-M;enum register_status;pseudo_register_read;struct regcache *regcache, int cookednum, gdb_byte *buf;regcache, cookednum, buf
+M;enum register_status;pseudo_register_read;readable_regcache *regcache, int cookednum, gdb_byte *buf;regcache, cookednum, buf
 # Read a register into a new struct value.  If the register is wholly
 # or partly unavailable, this should call mark_value_bytes_unavailable
 # as appropriate.  If this is defined, then pseudo_register_read will
 # never be called.
-M;struct value *;pseudo_register_read_value;struct regcache *regcache, int cookednum;regcache, cookednum
+M;struct value *;pseudo_register_read_value;readable_regcache *regcache, int cookednum;regcache, cookednum
 M;void;pseudo_register_write;struct regcache *regcache, int cookednum, const gdb_byte *buf;regcache, cookednum, buf
 #
 v;int;num_regs;;;0;-1
diff --git a/gdb/h8300-tdep.c b/gdb/h8300-tdep.c
index bf5b9ec..55e77b6 100644
--- a/gdb/h8300-tdep.c
+++ b/gdb/h8300-tdep.c
@@ -1160,7 +1160,7 @@  h8300_register_type (struct gdbarch *gdbarch, int regno)
    raw registers.  These helpers extend/narrow the values.  */
 
 static enum register_status
-pseudo_from_raw_register (struct gdbarch *gdbarch, struct regcache *regcache,
+pseudo_from_raw_register (struct gdbarch *gdbarch, readable_regcache *regcache,
 			  gdb_byte *buf, int pseudo_regno, int raw_regno)
 {
   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
@@ -1191,7 +1191,7 @@  raw_from_pseudo_register (struct gdbarch *gdbarch, struct regcache *regcache,
 
 static enum register_status
 h8300_pseudo_register_read (struct gdbarch *gdbarch,
-			    struct regcache *regcache, int regno,
+			    readable_regcache *regcache, int regno,
 			    gdb_byte *buf)
 {
   if (regno == E_PSEUDO_CCR_REGNUM (gdbarch))
diff --git a/gdb/hppa-tdep.c b/gdb/hppa-tdep.c
index 814b8a8..cc9434e 100644
--- a/gdb/hppa-tdep.c
+++ b/gdb/hppa-tdep.c
@@ -2747,7 +2747,7 @@  hppa_fetch_pointer_argument (struct frame_info *frame, int argi,
 }
 
 static enum register_status
-hppa_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+hppa_pseudo_register_read (struct gdbarch *gdbarch, readable_regcache *regcache,
 			   int regnum, gdb_byte *buf)
 {
   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
diff --git a/gdb/i386-tdep.c b/gdb/i386-tdep.c
index cd56642..6b59278 100644
--- a/gdb/i386-tdep.c
+++ b/gdb/i386-tdep.c
@@ -3248,7 +3248,7 @@  i386_pseudo_register_type (struct gdbarch *gdbarch, int regnum)
    the MMX registers need to be mapped onto floating point registers.  */
 
 static int
-i386_mmx_regnum_to_fp_regnum (struct regcache *regcache, int regnum)
+i386_mmx_regnum_to_fp_regnum (readable_regcache *regcache, int regnum)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (regcache->arch ());
   int mmxreg, fpreg;
@@ -3269,7 +3269,7 @@  i386_mmx_regnum_to_fp_regnum (struct regcache *regcache, int regnum)
 
 void
 i386_pseudo_register_read_into_value (struct gdbarch *gdbarch,
-				      struct regcache *regcache,
+				      readable_regcache *regcache,
 				      int regnum,
 				      struct value *result_value)
 {
@@ -3448,7 +3448,7 @@  i386_pseudo_register_read_into_value (struct gdbarch *gdbarch,
 
 static struct value *
 i386_pseudo_register_read_value (struct gdbarch *gdbarch,
-				 struct regcache *regcache,
+				 readable_regcache *regcache,
 				 int regnum)
 {
   struct value *result;
diff --git a/gdb/i386-tdep.h b/gdb/i386-tdep.h
index a71c103..81a93f1 100644
--- a/gdb/i386-tdep.h
+++ b/gdb/i386-tdep.h
@@ -364,7 +364,7 @@  extern struct type *i386_pseudo_register_type (struct gdbarch *gdbarch,
 					       int regnum);
 
 extern void i386_pseudo_register_read_into_value (struct gdbarch *gdbarch,
-						  struct regcache *regcache,
+						  readable_regcache *regcache,
 						  int regnum,
 						  struct value *result);
 
diff --git a/gdb/ia64-tdep.c b/gdb/ia64-tdep.c
index 18f517d..6c9b341 100644
--- a/gdb/ia64-tdep.c
+++ b/gdb/ia64-tdep.c
@@ -927,7 +927,7 @@  rse_address_add(CORE_ADDR addr, int nslots)
 }
 
 static enum register_status
-ia64_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+ia64_pseudo_register_read (struct gdbarch *gdbarch, readable_regcache *regcache,
                            int regnum, gdb_byte *buf)
 {
   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
diff --git a/gdb/m32c-tdep.c b/gdb/m32c-tdep.c
index 45dc438..173e8a4 100644
--- a/gdb/m32c-tdep.c
+++ b/gdb/m32c-tdep.c
@@ -51,7 +51,7 @@  typedef enum register_status (m32c_write_reg_t) (struct m32c_reg *reg,
 						 const gdb_byte *buf);
 
 typedef enum register_status (m32c_read_reg_t) (struct m32c_reg *reg,
-						struct regcache *cache,
+						readable_regcache *cache,
 						gdb_byte *buf);
 
 struct m32c_reg
@@ -310,7 +310,7 @@  static m32c_write_reg_t m32c_r3r2r1r0_write;
 
 /* Copy the value of the raw register REG from CACHE to BUF.  */
 static enum register_status
-m32c_raw_read (struct m32c_reg *reg, struct regcache *cache, gdb_byte *buf)
+m32c_raw_read (struct m32c_reg *reg, readable_regcache *cache, gdb_byte *buf)
 {
   return cache->raw_read (reg->num, buf);
 }
@@ -329,7 +329,7 @@  m32c_raw_write (struct m32c_reg *reg, struct regcache *cache,
 
 /* Return the value of the 'flg' register in CACHE.  */
 static int
-m32c_read_flg (struct regcache *cache)
+m32c_read_flg (readable_regcache *cache)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (cache->arch ());
   ULONGEST flg;
@@ -341,7 +341,7 @@  m32c_read_flg (struct regcache *cache)
 
 /* Evaluate the real register number of a banked register.  */
 static struct m32c_reg *
-m32c_banked_register (struct m32c_reg *reg, struct regcache *cache)
+m32c_banked_register (struct m32c_reg *reg, readable_regcache *cache)
 {
   return ((m32c_read_flg (cache) & reg->n) ? reg->ry : reg->rx);
 }
@@ -352,7 +352,7 @@  m32c_banked_register (struct m32c_reg *reg, struct regcache *cache)
    masked in REG->n set, then read REG->ry.  Otherwise, read
    REG->rx.  */
 static enum register_status
-m32c_banked_read (struct m32c_reg *reg, struct regcache *cache, gdb_byte *buf)
+m32c_banked_read (struct m32c_reg *reg, readable_regcache *cache, gdb_byte *buf)
 {
   struct m32c_reg *bank_reg = m32c_banked_register (reg, cache);
   return cache->raw_read (bank_reg->num, buf);
@@ -377,7 +377,7 @@  m32c_banked_write (struct m32c_reg *reg, struct regcache *cache,
 /* Move the value of SB from CACHE to BUF.  On bfd_mach_m32c, SB is a
    banked register; on bfd_mach_m16c, it's not.  */
 static enum register_status
-m32c_sb_read (struct m32c_reg *reg, struct regcache *cache, gdb_byte *buf)
+m32c_sb_read (struct m32c_reg *reg, readable_regcache *cache, gdb_byte *buf)
 {
   if (gdbarch_bfd_arch_info (reg->arch)->mach == bfd_mach_m16c)
     return m32c_raw_read (reg->rx, cache, buf);
@@ -442,7 +442,7 @@  m32c_find_part (struct m32c_reg *reg, int *offset_p, int *len_p)
    REG->type values, where higher indices refer to more significant
    bits, read the value of the REG->n'th element.  */
 static enum register_status
-m32c_part_read (struct m32c_reg *reg, struct regcache *cache, gdb_byte *buf)
+m32c_part_read (struct m32c_reg *reg, readable_regcache *cache, gdb_byte *buf)
 {
   int offset, len;
 
@@ -473,7 +473,7 @@  m32c_part_write (struct m32c_reg *reg, struct regcache *cache,
    concatenation of the values of the registers REG->rx and REG->ry,
    with REG->rx contributing the more significant bits.  */
 static enum register_status
-m32c_cat_read (struct m32c_reg *reg, struct regcache *cache, gdb_byte *buf)
+m32c_cat_read (struct m32c_reg *reg, readable_regcache *cache, gdb_byte *buf)
 {
   int high_bytes = TYPE_LENGTH (reg->rx->type);
   int low_bytes  = TYPE_LENGTH (reg->ry->type);
@@ -528,7 +528,7 @@  m32c_cat_write (struct m32c_reg *reg, struct regcache *cache,
    the concatenation (from most significant to least) of r3, r2, r1,
    and r0.  */
 static enum register_status
-m32c_r3r2r1r0_read (struct m32c_reg *reg, struct regcache *cache, gdb_byte *buf)
+m32c_r3r2r1r0_read (struct m32c_reg *reg, readable_regcache *cache, gdb_byte *buf)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (reg->arch);
   int len = TYPE_LENGTH (tdep->r0->type);
@@ -590,7 +590,7 @@  m32c_r3r2r1r0_write (struct m32c_reg *reg, struct regcache *cache,
 
 static enum register_status
 m32c_pseudo_register_read (struct gdbarch *arch,
-			   struct regcache *cache,
+			   readable_regcache *cache,
 			   int cookednum,
 			   gdb_byte *buf)
 {
diff --git a/gdb/m68hc11-tdep.c b/gdb/m68hc11-tdep.c
index b34548b..58ef4a3 100644
--- a/gdb/m68hc11-tdep.c
+++ b/gdb/m68hc11-tdep.c
@@ -279,7 +279,7 @@  m68hc11_which_soft_register (CORE_ADDR addr)
    fetch into a memory read.  */
 static enum register_status
 m68hc11_pseudo_register_read (struct gdbarch *gdbarch,
-			      struct regcache *regcache,
+			      readable_regcache *regcache,
 			      int regno, gdb_byte *buf)
 {
   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
diff --git a/gdb/mep-tdep.c b/gdb/mep-tdep.c
index 7b1fb23..1cda2b3 100644
--- a/gdb/mep-tdep.c
+++ b/gdb/mep-tdep.c
@@ -1114,7 +1114,7 @@  mep_register_type (struct gdbarch *gdbarch, int reg_nr)
 
 static enum register_status
 mep_pseudo_cr32_read (struct gdbarch *gdbarch,
-                      struct regcache *regcache,
+		      readable_regcache *regcache,
                       int cookednum,
                       gdb_byte *buf)
 {
@@ -1140,7 +1140,7 @@  mep_pseudo_cr32_read (struct gdbarch *gdbarch,
 
 static enum register_status
 mep_pseudo_cr64_read (struct gdbarch *gdbarch,
-                      struct regcache *regcache,
+                      readable_regcache *regcache,
                       int cookednum,
                       gdb_byte *buf)
 {
@@ -1150,7 +1150,7 @@  mep_pseudo_cr64_read (struct gdbarch *gdbarch,
 
 static enum register_status
 mep_pseudo_register_read (struct gdbarch *gdbarch,
-                          struct regcache *regcache,
+			  readable_regcache *regcache,
                           int cookednum,
                           gdb_byte *buf)
 {
diff --git a/gdb/mips-tdep.c b/gdb/mips-tdep.c
index 6b78093..2c1a8f0 100644
--- a/gdb/mips-tdep.c
+++ b/gdb/mips-tdep.c
@@ -737,7 +737,7 @@  mips_tdesc_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
    registers.  Take care of alignment and size problems.  */
 
 static enum register_status
-mips_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+mips_pseudo_register_read (struct gdbarch *gdbarch, readable_regcache *regcache,
 			   int cookednum, gdb_byte *buf)
 {
   int rawnum = cookednum % gdbarch_num_regs (gdbarch);
diff --git a/gdb/msp430-tdep.c b/gdb/msp430-tdep.c
index 4ae71f7..169b7e9 100644
--- a/gdb/msp430-tdep.c
+++ b/gdb/msp430-tdep.c
@@ -218,7 +218,7 @@  msp430_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 
 static enum register_status
 msp430_pseudo_register_read (struct gdbarch *gdbarch,
-			     struct regcache *regcache,
+			     readable_regcache *regcache,
 			     int regnum, gdb_byte *buffer)
 {
   if (MSP430_NUM_REGS <= regnum && regnum < MSP430_NUM_TOTAL_REGS)
diff --git a/gdb/nds32-tdep.c b/gdb/nds32-tdep.c
index 73a71b9..8cc9d5b 100644
--- a/gdb/nds32-tdep.c
+++ b/gdb/nds32-tdep.c
@@ -437,7 +437,7 @@  nds32_pseudo_register_name (struct gdbarch *gdbarch, int regnum)
 
 static enum register_status
 nds32_pseudo_register_read (struct gdbarch *gdbarch,
-			    struct regcache *regcache, int regnum,
+			    readable_regcache *regcache, int regnum,
 			    gdb_byte *buf)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
diff --git a/gdb/regcache.c b/gdb/regcache.c
index 8addc82..ad5e0a2 100644
--- a/gdb/regcache.c
+++ b/gdb/regcache.c
@@ -205,7 +205,7 @@  regcache::regcache (gdbarch *gdbarch, const address_space *aspace_,
 /* The register buffers.  A read-only register cache can hold the
    full [0 .. gdbarch_num_regs + gdbarch_num_pseudo_regs) while a
    read/write register cache can only hold [0 .. gdbarch_num_regs).  */
-  : reg_buffer (gdbarch, readonly_p_),
+  : readable_regcache (gdbarch, readonly_p_),
     m_aspace (aspace_), m_readonly_p (readonly_p_)
 {
   m_ptid = minus_one_ptid;
@@ -581,7 +581,7 @@  regcache_raw_read (struct regcache *regcache, int regnum, gdb_byte *buf)
 }
 
 enum register_status
-regcache::raw_read (int regnum, gdb_byte *buf)
+readable_regcache::raw_read (int regnum, gdb_byte *buf)
 {
   gdb_assert (buf != NULL);
   raw_update (regnum);
@@ -604,7 +604,7 @@  regcache_raw_read_signed (struct regcache *regcache, int regnum, LONGEST *val)
 
 template<typename T, typename>
 enum register_status
-regcache::raw_read (int regnum, T *val)
+readable_regcache::raw_read (int regnum, T *val)
 {
   gdb_byte *buf;
   enum register_status status;
@@ -677,17 +677,15 @@  regcache_cooked_read (struct regcache *regcache, int regnum, gdb_byte *buf)
 }
 
 enum register_status
-regcache::cooked_read (int regnum, gdb_byte *buf)
+readable_regcache::cooked_read (int regnum, gdb_byte *buf)
 {
   gdb_assert (regnum >= 0);
   gdb_assert (regnum < m_descr->nr_cooked_registers);
   if (regnum < num_raw_registers ())
     return raw_read (regnum, buf);
-  else if (m_readonly_p
+  else if (m_has_pseudo
 	   && m_register_status[regnum] != REG_UNKNOWN)
     {
-      /* Read-only register cache, perhaps the cooked value was
-	 cached?  */
       if (m_register_status[regnum] == REG_VALID)
 	memcpy (buf, register_buffer (regnum),
 		m_descr->sizeof_register[regnum]);
@@ -730,13 +728,13 @@  regcache_cooked_read_value (struct regcache *regcache, int regnum)
 }
 
 struct value *
-regcache::cooked_read_value (int regnum)
+readable_regcache::cooked_read_value (int regnum)
 {
   gdb_assert (regnum >= 0);
   gdb_assert (regnum < m_descr->nr_cooked_registers);
 
   if (regnum < num_raw_registers ()
-      || (m_readonly_p && m_register_status[regnum] != REG_UNKNOWN)
+      || (m_has_pseudo && m_register_status[regnum] != REG_UNKNOWN)
       || !gdbarch_pseudo_register_read_value_p (m_descr->gdbarch))
     {
       struct value *result;
@@ -770,7 +768,7 @@  regcache_cooked_read_signed (struct regcache *regcache, int regnum,
 
 template<typename T, typename>
 enum register_status
-regcache::cooked_read (int regnum, T *val)
+readable_regcache::cooked_read (int regnum, T *val)
 {
   enum register_status status;
   gdb_byte *buf;
@@ -910,20 +908,49 @@  typedef void (regcache_write_ftype) (struct regcache *regcache, int regnum,
 				     const void *buf);
 
 enum register_status
-regcache::xfer_part (int regnum, int offset, int len, void *in,
+readable_regcache::read_part (int regnum, int offset, int len, void *in,
+			      bool is_raw)
+{
+  struct gdbarch *gdbarch = arch ();
+  gdb_byte *reg = (gdb_byte *) alloca (register_size (gdbarch, regnum));
+
+  gdb_assert (in != NULL);
+  gdb_assert (offset >= 0 && offset <= m_descr->sizeof_register[regnum]);
+  gdb_assert (len >= 0 && offset + len <= m_descr->sizeof_register[regnum]);
+  /* Something to do?  */
+  if (offset + len == 0)
+    return REG_VALID;
+  /* Read (when needed) ...  */
+  enum register_status status;
+
+  if (is_raw)
+    status = raw_read (regnum, reg);
+  else
+    status = cooked_read (regnum, reg);
+  if (status != REG_VALID)
+    return status;
+
+  /* ... modify ...  */
+  memcpy (in, reg + offset, len);
+
+  return REG_VALID;
+}
+
+enum register_status
+regcache::write_part (int regnum, int offset, int len,
 		     const void *out, bool is_raw)
 {
   struct gdbarch *gdbarch = arch ();
   gdb_byte *reg = (gdb_byte *) alloca (register_size (gdbarch, regnum));
 
+  gdb_assert (out != NULL);
   gdb_assert (offset >= 0 && offset <= m_descr->sizeof_register[regnum]);
   gdb_assert (len >= 0 && offset + len <= m_descr->sizeof_register[regnum]);
   /* Something to do?  */
   if (offset + len == 0)
     return REG_VALID;
   /* Read (when needed) ...  */
-  if (in != NULL
-      || offset > 0
+  if (offset > 0
       || offset + len < m_descr->sizeof_register[regnum])
     {
       enum register_status status;
@@ -935,19 +962,13 @@  regcache::xfer_part (int regnum, int offset, int len, void *in,
       if (status != REG_VALID)
 	return status;
     }
-  /* ... modify ...  */
-  if (in != NULL)
-    memcpy (in, reg + offset, len);
-  if (out != NULL)
-    memcpy (reg + offset, out, len);
+
+  memcpy (reg + offset, out, len);
   /* ... write (when needed).  */
-  if (out != NULL)
-    {
-      if (is_raw)
-	raw_write (regnum, reg);
-      else
-	cooked_write (regnum, reg);
-    }
+  if (is_raw)
+    raw_write (regnum, reg);
+  else
+    cooked_write (regnum, reg);
 
   return REG_VALID;
 }
@@ -960,10 +981,10 @@  regcache_raw_read_part (struct regcache *regcache, int regnum,
 }
 
 enum register_status
-regcache::raw_read_part (int regnum, int offset, int len, gdb_byte *buf)
+readable_regcache::raw_read_part (int regnum, int offset, int len, gdb_byte *buf)
 {
   assert_regnum (regnum);
-  return xfer_part (regnum, offset, len, buf, NULL, true);
+  return read_part (regnum, offset, len, buf, true);
 }
 
 void
@@ -978,7 +999,7 @@  regcache::raw_write_part (int regnum, int offset, int len,
 			  const gdb_byte *buf)
 {
   assert_regnum (regnum);
-  xfer_part (regnum, offset, len, NULL, buf, true);
+  write_part (regnum, offset, len, buf, true);
 }
 
 enum register_status
@@ -990,10 +1011,11 @@  regcache_cooked_read_part (struct regcache *regcache, int regnum,
 
 
 enum register_status
-regcache::cooked_read_part (int regnum, int offset, int len, gdb_byte *buf)
+readable_regcache::cooked_read_part (int regnum, int offset, int len,
+				     gdb_byte *buf)
 {
   gdb_assert (regnum >= 0 && regnum < m_descr->nr_cooked_registers);
-  return xfer_part (regnum, offset, len, buf, NULL, false);
+  return read_part (regnum, offset, len, buf, false);
 }
 
 void
@@ -1008,7 +1030,7 @@  regcache::cooked_write_part (int regnum, int offset, int len,
 			     const gdb_byte *buf)
 {
   gdb_assert (regnum >= 0 && regnum < m_descr->nr_cooked_registers);
-  xfer_part (regnum, offset, len, NULL, buf, false);
+  write_part (regnum, offset, len, buf, false);
 }
 
 /* Supply register REGNUM, whose contents are stored in BUF, to REGCACHE.  */
diff --git a/gdb/regcache.h b/gdb/regcache.h
index e2c7621..1c7ee8c 100644
--- a/gdb/regcache.h
+++ b/gdb/regcache.h
@@ -262,9 +262,41 @@  protected:
   signed char *m_register_status;
 };
 
+/* An abstract class which only has methods doing read.  */
+
+class readable_regcache : public reg_buffer
+{
+public:
+  readable_regcache (gdbarch *gdbarch, bool has_pseudo)
+    : reg_buffer (gdbarch, has_pseudo)
+  {}
+
+  enum register_status raw_read (int regnum, gdb_byte *buf);
+  template<typename T, typename = RequireLongest<T>>
+  enum register_status raw_read (int regnum, T *val);
+
+  enum register_status raw_read_part (int regnum, int offset, int len,
+				      gdb_byte *buf);
+
+  virtual void raw_update (int regnum) = 0;
+
+  enum register_status cooked_read (int regnum, gdb_byte *buf);
+  template<typename T, typename = RequireLongest<T>>
+  enum register_status cooked_read (int regnum, T *val);
+
+  enum register_status cooked_read_part (int regnum, int offset, int len,
+					 gdb_byte *buf);
+
+  struct value *cooked_read_value (int regnum);
+
+protected:
+  enum register_status read_part (int regnum, int offset, int len, void *in,
+				  bool is_raw);
+};
+
 /* The register cache for storing raw register values.  */
 
-class regcache : public reg_buffer
+class regcache : public readable_regcache
 {
 public:
   regcache (gdbarch *gdbarch)
@@ -287,28 +319,17 @@  public:
 
   void save (regcache_cooked_read_ftype *cooked_read, void *src);
 
-  enum register_status cooked_read (int regnum, gdb_byte *buf);
   void cooked_write (int regnum, const gdb_byte *buf);
 
-  enum register_status raw_read (int regnum, gdb_byte *buf);
-
   void raw_write (int regnum, const gdb_byte *buf);
 
   template<typename T, typename = RequireLongest<T>>
-  enum register_status raw_read (int regnum, T *val);
-
-  template<typename T, typename = RequireLongest<T>>
   void raw_write (int regnum, T val);
 
-  struct value *cooked_read_value (int regnum);
-
-  template<typename T, typename = RequireLongest<T>>
-  enum register_status cooked_read (int regnum, T *val);
-
   template<typename T, typename = RequireLongest<T>>
   void cooked_write (int regnum, T val);
 
-  void raw_update (int regnum);
+  void raw_update (int regnum) override;
 
   void raw_collect (int regnum, void *buf) const;
 
@@ -328,14 +349,8 @@  public:
 
   void invalidate (int regnum);
 
-  enum register_status raw_read_part (int regnum, int offset, int len,
-				      gdb_byte *buf);
-
   void raw_write_part (int regnum, int offset, int len, const gdb_byte *buf);
 
-  enum register_status cooked_read_part (int regnum, int offset, int len,
-					 gdb_byte *buf);
-
   void cooked_write_part (int regnum, int offset, int len,
 			  const gdb_byte *buf);
 
@@ -370,14 +385,15 @@  protected:
 private:
   void restore (struct regcache *src);
 
-  enum register_status xfer_part (int regnum, int offset, int len, void *in,
-				  const void *out, bool is_raw);
-
   void transfer_regset (const struct regset *regset,
 			struct regcache *out_regcache,
 			int regnum, const void *in_buf,
 			void *out_buf, size_t size) const;
 
+  enum register_status write_part (int regnum, int offset, int len,
+				   const void *out, bool is_raw);
+
+
   /* The address space of this register cache (for registers where it
      makes sense, like PC or SP).  */
   const address_space * const m_aspace;
diff --git a/gdb/rl78-tdep.c b/gdb/rl78-tdep.c
index 55653db..af6a089 100644
--- a/gdb/rl78-tdep.c
+++ b/gdb/rl78-tdep.c
@@ -640,7 +640,7 @@  rl78_make_data_address (CORE_ADDR addr)
 
 static enum register_status
 rl78_pseudo_register_read (struct gdbarch *gdbarch,
-                           struct regcache *regcache,
+			   readable_regcache *regcache,
                            int reg, gdb_byte *buffer)
 {
   enum register_status status;
diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c
index 70dc55f..a5b7091 100644
--- a/gdb/rs6000-tdep.c
+++ b/gdb/rs6000-tdep.c
@@ -2706,12 +2706,6 @@  e500_move_ev_register (move_ev_register_func move,
 }
 
 static enum register_status
-do_regcache_raw_read (struct regcache *regcache, int regnum, void *buffer)
-{
-  return regcache_raw_read (regcache, regnum, (gdb_byte *) buffer);
-}
-
-static enum register_status
 do_regcache_raw_write (struct regcache *regcache, int regnum, void *buffer)
 {
   regcache_raw_write (regcache, regnum, (const gdb_byte *) buffer);
@@ -2720,10 +2714,36 @@  do_regcache_raw_write (struct regcache *regcache, int regnum, void *buffer)
 }
 
 static enum register_status
-e500_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
-			   int reg_nr, gdb_byte *buffer)
+e500_pseudo_register_read (struct gdbarch *gdbarch, readable_regcache *regcache,
+			   int ev_reg, gdb_byte *buffer)
 {
-  return e500_move_ev_register (do_regcache_raw_read, regcache, reg_nr, buffer);
+  struct gdbarch *arch = regcache->arch ();
+  struct gdbarch_tdep *tdep = gdbarch_tdep (arch);
+  int reg_index;
+  enum register_status status;
+
+  gdb_assert (IS_SPE_PSEUDOREG (tdep, ev_reg));
+
+  reg_index = ev_reg - tdep->ppc_ev0_regnum;
+
+  if (gdbarch_byte_order (arch) == BFD_ENDIAN_BIG)
+    {
+      status = regcache->raw_read (tdep->ppc_ev0_upper_regnum + reg_index,
+				   buffer);
+      if (status == REG_VALID)
+	status = regcache->raw_read (tdep->ppc_gp0_regnum + reg_index,
+				     buffer + 4);
+    }
+  else
+    {
+      status = regcache->raw_read (tdep->ppc_gp0_regnum + reg_index, buffer);
+      if (status == REG_VALID)
+	status = regcache->raw_read (tdep->ppc_ev0_upper_regnum + reg_index,
+				     buffer + 4);
+    }
+
+  return status;
+
 }
 
 static void
@@ -2736,7 +2756,7 @@  e500_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
 
 /* Read method for DFP pseudo-registers.  */
 static enum register_status
-dfp_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+dfp_pseudo_register_read (struct gdbarch *gdbarch, readable_regcache *regcache,
 			   int reg_nr, gdb_byte *buffer)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
@@ -2792,7 +2812,7 @@  dfp_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
 
 /* Read method for POWER7 VSX pseudo-registers.  */
 static enum register_status
-vsx_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+vsx_pseudo_register_read (struct gdbarch *gdbarch, readable_regcache *regcache,
 			   int reg_nr, gdb_byte *buffer)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
@@ -2857,7 +2877,7 @@  vsx_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
 
 /* Read method for POWER7 Extended FP pseudo-registers.  */
 static enum register_status
-efpr_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+efpr_pseudo_register_read (struct gdbarch *gdbarch, readable_regcache *regcache,
 			   int reg_nr, gdb_byte *buffer)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
@@ -2865,9 +2885,9 @@  efpr_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
   int offset = gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG ? 0 : 8;
 
   /* Read the portion that overlaps the VMX register.  */
-  return regcache_raw_read_part (regcache, tdep->ppc_vr0_regnum + reg_index,
-				 offset, register_size (gdbarch, reg_nr),
-				 buffer);
+  return regcache->raw_read_part (tdep->ppc_vr0_regnum + reg_index,
+				  offset, register_size (gdbarch, reg_nr),
+				  buffer);
 }
 
 /* Write method for POWER7 Extended FP pseudo-registers.  */
@@ -2887,7 +2907,7 @@  efpr_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
 
 static enum register_status
 rs6000_pseudo_register_read (struct gdbarch *gdbarch,
-			     struct regcache *regcache,
+			     readable_regcache *regcache,
 			     int reg_nr, gdb_byte *buffer)
 {
   struct gdbarch *regcache_arch = regcache->arch ();
diff --git a/gdb/s390-tdep.c b/gdb/s390-tdep.c
index 9626e05..408bb87 100644
--- a/gdb/s390-tdep.c
+++ b/gdb/s390-tdep.c
@@ -1281,7 +1281,7 @@  s390_pseudo_register_type (struct gdbarch *gdbarch, int regnum)
 /* Implement pseudo_register_read gdbarch method.  */
 
 static enum register_status
-s390_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+s390_pseudo_register_read (struct gdbarch *gdbarch, readable_regcache *regcache,
 			   int regnum, gdb_byte *buf)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
diff --git a/gdb/sh-tdep.c b/gdb/sh-tdep.c
index a82c5b3..75ea673 100644
--- a/gdb/sh-tdep.c
+++ b/gdb/sh-tdep.c
@@ -1628,7 +1628,7 @@  dr_reg_base_num (struct gdbarch *gdbarch, int dr_regnum)
 
 static enum register_status
 pseudo_register_read_portions (struct gdbarch *gdbarch,
-			       struct regcache *regcache,
+			       readable_regcache *regcache,
 			       int portions,
 			       int base_regnum, gdb_byte *buffer)
 {
@@ -1649,7 +1649,7 @@  pseudo_register_read_portions (struct gdbarch *gdbarch,
 }
 
 static enum register_status
-sh_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+sh_pseudo_register_read (struct gdbarch *gdbarch, readable_regcache *regcache,
 			 int reg_nr, gdb_byte *buffer)
 {
   int base_regnum;
diff --git a/gdb/sh64-tdep.c b/gdb/sh64-tdep.c
index 5da517a..8eb88eb 100644
--- a/gdb/sh64-tdep.c
+++ b/gdb/sh64-tdep.c
@@ -1504,7 +1504,7 @@  sh64_register_convert_to_raw (struct gdbarch *gdbarch, struct type *type,
 
 static enum register_status
 pseudo_register_read_portions (struct gdbarch *gdbarch,
-			       struct regcache *regcache,
+			       readable_regcache *regcache,
 			       int portions,
 			       int base_regnum, gdb_byte *buffer)
 {
@@ -1525,7 +1525,7 @@  pseudo_register_read_portions (struct gdbarch *gdbarch,
 }
 
 static enum register_status
-sh64_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+sh64_pseudo_register_read (struct gdbarch *gdbarch, readable_regcache *regcache,
 			   int reg_nr, gdb_byte *buffer)
 {
   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
diff --git a/gdb/sparc-tdep.c b/gdb/sparc-tdep.c
index 1ce7ee0..633bd68 100644
--- a/gdb/sparc-tdep.c
+++ b/gdb/sparc-tdep.c
@@ -503,7 +503,7 @@  sparc32_register_type (struct gdbarch *gdbarch, int regnum)
 
 static enum register_status
 sparc32_pseudo_register_read (struct gdbarch *gdbarch,
-			      struct regcache *regcache,
+			      readable_regcache *regcache,
 			      int regnum, gdb_byte *buf)
 {
   enum register_status status;
diff --git a/gdb/sparc64-tdep.c b/gdb/sparc64-tdep.c
index 67103cc..6f3ca19 100644
--- a/gdb/sparc64-tdep.c
+++ b/gdb/sparc64-tdep.c
@@ -899,7 +899,7 @@  sparc64_register_type (struct gdbarch *gdbarch, int regnum)
 
 static enum register_status
 sparc64_pseudo_register_read (struct gdbarch *gdbarch,
-			      struct regcache *regcache,
+			      readable_regcache *regcache,
 			      int regnum, gdb_byte *buf)
 {
   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
diff --git a/gdb/spu-tdep.c b/gdb/spu-tdep.c
index f2f4f65..da7b937 100644
--- a/gdb/spu-tdep.c
+++ b/gdb/spu-tdep.c
@@ -182,7 +182,7 @@  spu_register_type (struct gdbarch *gdbarch, int reg_nr)
 /* Pseudo registers for preferred slots - stack pointer.  */
 
 static enum register_status
-spu_pseudo_register_read_spu (struct regcache *regcache, const char *regname,
+spu_pseudo_register_read_spu (readable_regcache *regcache, const char *regname,
 			      gdb_byte *buf)
 {
   struct gdbarch *gdbarch = regcache->arch ();
@@ -207,7 +207,7 @@  spu_pseudo_register_read_spu (struct regcache *regcache, const char *regname,
 }
 
 static enum register_status
-spu_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+spu_pseudo_register_read (struct gdbarch *gdbarch, readable_regcache *regcache,
                           int regnum, gdb_byte *buf)
 {
   gdb_byte reg[16];
diff --git a/gdb/xtensa-tdep.c b/gdb/xtensa-tdep.c
index 6eb6fd3..a1ecf5f 100644
--- a/gdb/xtensa-tdep.c
+++ b/gdb/xtensa-tdep.c
@@ -453,7 +453,7 @@  xtensa_register_write_masked (struct regcache *regcache,
    of the registers and assemble them into a single value.  */
 
 static enum register_status
-xtensa_register_read_masked (struct regcache *regcache,
+xtensa_register_read_masked (readable_regcache *regcache,
 			     xtensa_register_t *reg, gdb_byte *buffer)
 {
   unsigned int value[(XTENSA_MAX_REGISTER_SIZE + 3) / 4];
@@ -547,7 +547,7 @@  xtensa_register_read_masked (struct regcache *regcache,
 
 static enum register_status
 xtensa_pseudo_register_read (struct gdbarch *gdbarch,
-			     struct regcache *regcache,
+			     readable_regcache *regcache,
 			     int regnum,
 			     gdb_byte *buffer)
 {