* dcache.c: Add prototypes. Make many functions static.

* (dcache_peek dcache_fetch dcache_poke):  Make dcache_fetch and
	dcache_poke call dcache_xfer_memory directly in order to fix
	problems with turning off dcache.  dcache_peek is now unnecessary,
	so it goes away.

	* defs.h:  Define new macros HOST_{FLOAT DOUBLE	LONG_DOUBLE}_FORMAT
	and TARGET_{FLOAT DOUBLE LONG_DOUBLE}_FORMAT to specify a pointer
	to a struct floatformat.  This allows for better handling of
	targets whose floating point formats differ from the host by more
	than just byte order.
	* (floatformat_to_long_double floatformat_from_long_double):
	Prototypes for new functions in utils.c.
	* (floatformat_to_doublest floatformat_from_doublest):  Prototypes
	for pointers to floating point conversion functions.  The actual
	function uses either double or long double if the host supports it.
	* findvar.c (floatformat_to_doublest floatformat_from_doublest):
	Initialize to point at correct function depending on HAVE_LONG_DOUBLE.
	* (extract_floating store_floating):  Rewrite.  Now, if host fp
	format is the same as the target, we just do a copy.  Otherwise,
	we call floatformat_{to from}_doublest.
	* remote-nindy.c (nindy_xfer_inferior_memory):  Change param
	`write' to `should_write'.
	* utils.c (floatformat_to_long_double
	floatformat_from_long_double):  New routines that implement long
	double versions of functions in libiberty/floatformat.c.
	* config/i960/tm-i960.h (TARGET_LONG_DOUBLE_FORMAT):  Define this for
	i960 extended real (80 bit) numbers.
	* nindy-share/nindy.c (ninMemGet ninMemPut):  Return number of bytes
	actually read or written.

gdb/defs.h

@@ -21,6 +21,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
 #ifndef DEFS_H
 #define DEFS_H
 
+#include "config.h"		/* Generated by configure */
 #include <stdio.h>
 #include <errno.h>		/* System call error return status */
 
@@ -811,6 +812,8 @@ extern LONGEST extract_signed_integer PARAMS ((void *, int));
 
 extern unsigned LONGEST extract_unsigned_integer PARAMS ((void *, int));
 
+extern int extract_long_unsigned_integer PARAMS ((void *, int, LONGEST *));
+
 extern CORE_ADDR extract_address PARAMS ((void *, int));
 
 extern void store_signed_integer PARAMS ((void *, int, LONGEST));
@@ -819,9 +822,101 @@ extern void store_unsigned_integer PARAMS ((void *, int, unsigned LONGEST));
 
 extern void store_address PARAMS ((void *, int, CORE_ADDR));
 
-extern double extract_floating PARAMS ((void *, int));
+/* Setup definitions for host and target floating point formats.  We need to
+   consider the format for `float', `double', and `long double' for both target
+   and host.  We need to do this so that we know what kind of conversions need
+   to be done when converting target numbers to and from the hosts DOUBLEST
+   data type.  */
 
-extern void store_floating PARAMS ((void *, int, double));
+/* This is used to indicate that we don't know the format of the floating point
+   number.  Typically, this is useful for native ports, where the actual format
+   is irrelevant, since no conversions will be taking place.  */
+
+extern const struct floatformat floatformat_unknown;
+
+#if HOST_BYTE_ORDER == BIG_ENDIAN
+#  ifndef HOST_FLOAT_FORMAT
+#    define HOST_FLOAT_FORMAT &floatformat_ieee_single_big
+#  endif
+#  ifndef HOST_DOUBLE_FORMAT
+#    define HOST_DOUBLE_FORMAT &floatformat_ieee_double_big
+#  endif
+#else				/* LITTLE_ENDIAN */
+#  ifndef HOST_FLOAT_FORMAT
+#    define HOST_FLOAT_FORMAT &floatformat_ieee_single_little
+#  endif
+#  ifndef HOST_DOUBLE_FORMAT
+#    define HOST_DOUBLE_FORMAT &floatformat_ieee_double_little
+#  endif
+#endif
+
+#ifndef HOST_LONG_DOUBLE_FORMAT
+#define HOST_LONG_DOUBLE_FORMAT &floatformat_unknown
+#endif
+
+#ifndef TARGET_BYTE_ORDER_SELECTABLE
+#  if TARGET_BYTE_ORDER == BIG_ENDIAN
+#    ifndef TARGET_FLOAT_FORMAT
+#      define TARGET_FLOAT_FORMAT &floatformat_ieee_single_big
+#    endif
+#    ifndef TARGET_DOUBLE_FORMAT
+#      define TARGET_DOUBLE_FORMAT &floatformat_ieee_double_big
+#    endif
+#  else /* LITTLE_ENDIAN */
+#    ifndef TARGET_FLOAT_FORMAT
+#      define TARGET_FLOAT_FORMAT &floatformat_ieee_single_little
+#    endif
+#    ifndef TARGET_DOUBLE_FORMAT
+#      define TARGET_DOUBLE_FORMAT &floatformat_ieee_double_little
+#    endif
+#  endif
+#  ifndef TARGET_LONG_DOUBLE_FORMAT
+#    define TARGET_LONG_DOUBLE_FORMAT &floatformat_unknown
+#  endif
+#else				/* TARGET_BYTE_ORDER_SELECTABLE */
+#  ifndef TARGET_FLOAT_FORMAT
+	Need a definition for target float format
+#  endif
+#  ifndef TARGET_DOUBLE_FORMAT
+	Need a definition for target double format
+#  endif
+#  ifndef TARGET_LONG_DOUBLE_FORMAT
+	Need a definition for target long double format
+#  endif
+#endif
+
+/* Use `long double' if the host compiler supports it.  (Note that this is not
+   necessarily any longer than `double'.  On SunOS/gcc, it's the same as
+   double.)  This is necessary because GDB internally converts all floating
+   point values to the widest type supported by the host.
+
+   There are problems however, when the target `long double' is longer than the
+   host's `long double'.  In general, we'll probably reduce the precision of
+   any such values and print a warning.  */
+
+#ifdef HAVE_LONG_DOUBLE
+typedef long double DOUBLEST;
+extern void floatformat_to_long_double PARAMS ((const struct floatformat *,
+						char *, DOUBLEST *));
+extern void floatformat_from_long_double PARAMS ((const struct floatformat *,
+						  DOUBLEST *, char *));
+#else
+typedef double DOUBLEST;
+#endif
+
+/* Pointer to appropriate conversion routine to convert between target floating
+   point format and DOUBLEST.  */
+
+extern void
+(*floatformat_to_doublest) PARAMS ((const struct floatformat *,
+				    char *, DOUBLEST *));
+extern void
+(*floatformat_from_doublest) PARAMS ((const struct floatformat *,
+				      DOUBLEST *, char *));
+
+extern DOUBLEST extract_floating PARAMS ((void *, int));
+
+extern void store_floating PARAMS ((void *, int, DOUBLEST));
 
 /* On some machines there are bits in addresses which are not really
    part of the address, but are used by the kernel, the hardware, etc.