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, 35 insertions, 19 deletions

diff --git a/gdb/s390-tdep.c b/gdb/s390-tdep.c
index 85e4c130001..d74bbf05814 100644
--- a/gdb/s390-tdep.c
+++ b/gdb/s390-tdep.c
@@ -216,7 +216,7 @@ s390_pseudo_register_type (struct gdbarch *gdbarch, int regnum)
   internal_error (__FILE__, __LINE__, _("invalid regnum"));
 }
 
-static void
+static enum register_status
 s390_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
 			   int regnum, gdb_byte *buf)
 {
@@ -227,37 +227,53 @@ s390_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
 
   if (regnum == tdep->pc_regnum)
     {
-      regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &val);
-      if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
-	val &= 0x7fffffff;
-      store_unsigned_integer (buf, regsize, byte_order, val);
-      return;
+      enum register_status status;
+
+      status = regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &val);
+      if (status == REG_VALID)
+	{
+	  if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
+	    val &= 0x7fffffff;
+	  store_unsigned_integer (buf, regsize, byte_order, val);
+	}
+      return status;
     }
 
   if (regnum == tdep->cc_regnum)
     {
-      regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &val);
-      if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
-	val = (val >> 12) & 3;
-      else
-	val = (val >> 44) & 3;
-      store_unsigned_integer (buf, regsize, byte_order, val);
-      return;
+      enum register_status status;
+
+      status = regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &val);
+      if (status == REG_VALID)
+	{
+	  if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
+	    val = (val >> 12) & 3;
+	  else
+	    val = (val >> 44) & 3;
+	  store_unsigned_integer (buf, regsize, byte_order, val);
+	}
+      return status;
     }
 
   if (tdep->gpr_full_regnum != -1
       && regnum >= tdep->gpr_full_regnum
       && regnum < tdep->gpr_full_regnum + 16)
     {
+      enum register_status status;
       ULONGEST val_upper;
+
       regnum -= tdep->gpr_full_regnum;
 
-      regcache_raw_read_unsigned (regcache, S390_R0_REGNUM + regnum, &val);
-      regcache_raw_read_unsigned (regcache, S390_R0_UPPER_REGNUM + regnum,
-				  &val_upper);
-      val |= val_upper << 32;
-      store_unsigned_integer (buf, regsize, byte_order, val);
-      return;
+      status = regcache_raw_read_unsigned (regcache, S390_R0_REGNUM + regnum, &val);
+      if (status == REG_VALID)
+	status = regcache_raw_read_unsigned (regcache, S390_R0_UPPER_REGNUM + regnum,
+					     &val_upper);
+      if (status == REG_VALID)
+	{
+	  val |= val_upper << 32;
+	  store_unsigned_integer (buf, regsize, byte_order, val);
+	}
+      return status;
     }
 
   internal_error (__FILE__, __LINE__, _("invalid regnum"));