gdb/

	* regcache.h (regcache_raw_read, regcache_raw_read_signed)
	(regcache_raw_read_unsigned, regcache_raw_read_signed)
	(regcache_raw_read_unsigned, regcache_raw_read_part)
	(regcache_cooked_read, regcache_cooked_read_signed)
	(regcache_cooked_read_unsigned, regcache_cooked_read_part)
	(regcache_cooked_read_ftype): Change return to enum
	register_status.
	* regcache.c: Include exceptions.h
	(regcache_save): Adjust to handle REG_UNAVAILABLE registers.
	(do_cooked_read): Change return to enum register_status.  Always
	forward to regcache_cooked_read.
	(regcache_raw_read): Change return to enum register_status.  If
	the register is not REG_VALID, memset the buffer.  Return the
	register's status.
	(regcache_raw_read_signed): Handle non-REG_VALID registers and
	return the register's status.
	(regcache_raw_read_unsigned): Ditto.
	(regcache_cooked_read): Change return to enum register_status.
	Assert that with read-only regcaches, the register's status must
	be known.  If the regcache is read-only, and the register is not
	REG_VALID, memset the buffer.  Return the register's status.
	(regcache_cooked_read_signed): Change return to enum
	register_status.  Handle non-REG_VALID registers and return the
	register's status.
	(regcache_cooked_read_unsigned): Change return to enum
	register_status.  Handle non-REG_VALID registers and return the
	register's status.
	(regcache_xfer_part, regcache_raw_read_part)
	(regcache_cooked_read_part): Change return to enum
	register_status.  Return the register's status.
	(regcache_read_pc): Throw NOT_AVAILABLE_ERROR if the register is
	unavailable.
	(regcache_dump): Handle unavailable cooked registers.
	* frame.c (do_frame_register_read): Adjust interface to match
	regcache_cooked_read_ftype.
	* gdbarch.sh (pseudo_register_read): Change return to enum
	register_status.
	* gdbarch.h, gdbarch.c: Regenerate.

	* i386-tdep.h (i386_pseudo_register_read): Change return to enum
	register_status.
	* i386-tdep.c (i386_pseudo_register_read): Change return to enum
	register_status.  If reading a raw register indicates the raw
	register is not valid, return the raw register's status,
	otherwise, return REG_VALID.
	* amd64-tdep.c (amd64_pseudo_register_read): Change return to enum
	register_status.  Handle non-REG_VALID raw registers and return
	the register's status.
	* arm-tdep.c (arm_neon_quad_read)
	(arm_pseudo_read): Change return to enum register_status.  Handle
	non-REG_VALID raw registers and return the register's status.
	* avr-tdep.c (avr_pseudo_register_read): Ditto.
	* frv-tdep.c (frv_pseudo_register_read): Ditto.
	* h8300-tdep.c (h8300_pseudo_register_read): Ditto.
	* hppa-tdep.c (hppa_pseudo_register_read): Ditto.
	* m32c-tdep.c (m32c_move_reg_t): Change return to enum
	register_status.
	(m32c_raw_read, m32c_raw_write, m32c_banked_read)
	(m32c_banked_write, m32c_sb_read, m32c_sb_write, m32c_part_read)
	(m32c_part_write, m32c_cat_read, m32c_cat_write)
	(m32c_r3r2r1r0_read, m32c_r3r2r1r0_write)
	(m32c_pseudo_register_read): Change return to enum
	register_status.  Adjust.
	* m68hc11-tdep.c (m68hc11_pseudo_register_read): Change return to
	enum register_status.  Return the register's status.
	* mep-tdep.c (mep_pseudo_cr32_read): Change return to enum
	register_status.  Return the register's status.
	(mep_pseudo_cr64_read, mep_pseudo_register_read): Ditto.
	* mips-tdep.c (mips_pseudo_register_read): Ditto.
	* mt-tdep.c (mt_pseudo_register_read): Ditto.
	* rs6000-tdep.c (move_ev_register_func): New typedef.
	(e500_move_ev_register): Use it.  Change return to enum
	register_status.  Return the register's status.
	(do_regcache_raw_read): New function.
	(do_regcache_raw_write): New function.
	(e500_pseudo_register_read): Change return to enum
	register_status.  Return the register's status.  Use
	do_regcache_raw_read.
	(e500_pseudo_register_write): Adjust.  Use do_regcache_raw_write.
	(dfp_pseudo_register_read): Change return to enum register_status.
	Return the register's status.
	(vsx_pseudo_register_read): Ditto.
	(efpr_pseudo_register_read): Ditto.
	(rs6000_pseudo_register_read): Ditto.
	* s390-tdep.c (s390_pseudo_register_read): Change return to enum
	register_status.  Return the register's status.
	* sh64-tdep.c (pseudo_register_read_portions): New function.
	(sh64_pseudo_register_read): Change return to enum
	register_status.  Use pseudo_register_read_portions.  Return the
	register's status.
	* ia64-tdep.c (ia64_pseudo_register_read): Change return to enum
	register_status.  Return the register's status.
	* sh-tdep.c (pseudo_register_read_portions): New function.
	(sh_pseudo_register_read): Change return to enum register_status.
	Use pseudo_register_read_portions.  Return the register's status.
	* sparc-tdep.c (sparc32_pseudo_register_read): Change return to
	enum register_status.  Return the register's status.
	* sparc64-tdep.c (sparc64_pseudo_register_read): Ditto.
	* spu-tdep.c (spu_pseudo_register_read_spu)
	(spu_pseudo_register_read): Ditto.
	* xtensa-tdep.c (xtensa_register_read_masked)
	(xtensa_pseudo_register_read): Ditto.
	* bfin-tdep.c (bfin_pseudo_register_read): Ditto.

1 files changed, 22 insertions, 14 deletions

diff --git a/gdb/xtensa-tdep.c b/gdb/xtensa-tdep.c
index 1bb97ba1730..316a8cf5194 100644
--- a/gdb/xtensa-tdep.c
+++ b/gdb/xtensa-tdep.c
@@ -453,7 +453,7 @@ xtensa_register_write_masked (struct regcache *regcache,
 /* Read a tie state or mapped registers.  Read the masked areas
    of the registers and assemble them into a single value.  */
 
-static void
+static enum register_status
 xtensa_register_read_masked (struct regcache *regcache,
 			     xtensa_register_t *reg, gdb_byte *buffer)
 {
@@ -479,8 +479,12 @@ xtensa_register_read_masked (struct regcache *regcache,
       int r = mask->mask[i].reg_num;
       if (r >= 0)
 	{
+	  enum register_status status;
 	  ULONGEST val;
-	  regcache_cooked_read_unsigned (regcache, r, &val);
+
+	  status = regcache_cooked_read_unsigned (regcache, r, &val);
+	  if (status != REG_VALID)
+	    return status;
 	  regval = (unsigned int) val;
 	}
       else
@@ -535,12 +539,14 @@ xtensa_register_read_masked (struct regcache *regcache,
 	buffer[i] = mem & 0xff;
 	mem >>= 8;
       }
+
+  return REG_VALID;
 }
 
 
 /* Read pseudo registers.  */
 
-static void
+static enum register_status
 xtensa_pseudo_register_read (struct gdbarch *gdbarch,
 			     struct regcache *regcache,
 			     int regnum,
@@ -561,16 +567,20 @@ xtensa_pseudo_register_read (struct gdbarch *gdbarch,
       && (regnum <= gdbarch_tdep (gdbarch)->a0_base + 15))
     {
       gdb_byte *buf = (gdb_byte *) alloca (MAX_REGISTER_SIZE);
+      enum register_status status;
 
-      regcache_raw_read (regcache, gdbarch_tdep (gdbarch)->wb_regnum, buf);
+      status = regcache_raw_read (regcache,
+				  gdbarch_tdep (gdbarch)->wb_regnum,
+				  buf);
+      if (status != REG_VALID)
+	return status;
       regnum = arreg_number (gdbarch, regnum,
 			     extract_unsigned_integer (buf, 4, byte_order));
     }
 
   /* We can always read non-pseudo registers.  */
   if (regnum >= 0 && regnum < gdbarch_num_regs (gdbarch))
-    regcache_raw_read (regcache, regnum, buffer);
-
+    return regcache_raw_read (regcache, regnum, buffer);
 
   /* We have to find out how to deal with priveleged registers.
      Let's treat them as pseudo-registers, but we cannot read/write them.  */
@@ -581,6 +591,7 @@ xtensa_pseudo_register_read (struct gdbarch *gdbarch,
       buffer[1] = (gdb_byte)0;
       buffer[2] = (gdb_byte)0;
       buffer[3] = (gdb_byte)0;
+      return REG_VALID;
     }
   /* Pseudo registers.  */
   else if (regnum >= 0
@@ -598,7 +609,7 @@ xtensa_pseudo_register_read (struct gdbarch *gdbarch,
 	    {
 	      warning (_("cannot read register %s"),
 		       xtensa_register_name (gdbarch, regnum));
-	      return;
+	      return REG_VALID;
 	    }
 	}
 
@@ -609,26 +620,23 @@ xtensa_pseudo_register_read (struct gdbarch *gdbarch,
 	  if (flags & xtTargetFlagsUseFetchStore)
 	    {
 	      warning (_("cannot read register"));
-	      return;
+	      return REG_VALID;
 	    }
 
 	  /* On some targets (esp. simulators), we can always read the reg.  */
 	  else if ((flags & xtTargetFlagsNonVisibleRegs) == 0)
 	    {
 	      warning (_("cannot read register"));
-	      return;
+	      return REG_VALID;
 	    }
 	}
 
       /* We can always read mapped registers.  */
       else if (type == xtRegisterTypeMapped || type == xtRegisterTypeTieState)
-        {
-	  xtensa_register_read_masked (regcache, reg, buffer);
-	  return;
-	}
+	return xtensa_register_read_masked (regcache, reg, buffer);
 
       /* Assume that we can read the register.  */
-      regcache_raw_read (regcache, regnum, buffer);
+      return regcache_raw_read (regcache, regnum, buffer);
     }
   else
     internal_error (__FILE__, __LINE__,