/* IEEE floating point support routines, for GDB, the GNU Debugger.
- Copyright (C) 1991, 1994, 1999, 2000 Free Software Foundation, Inc.
+ Copyright (C) 1991, 1994, 1999, 2000, 2003 Free Software Foundation, Inc.
This file is part of GDB.
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+#include "ansidecl.h"
#include "floatformat.h"
#include <math.h> /* ldexp */
-#ifdef __STDC__
+#ifdef ANSI_PROTOTYPES
#include <stddef.h>
extern void *memcpy (void *s1, const void *s2, size_t n);
extern void *memset (void *s, int c, size_t n);
extern char *memset ();
#endif
+static unsigned long get_field PARAMS ((const unsigned char *,
+ enum floatformat_byteorders,
+ unsigned int,
+ unsigned int,
+ unsigned int));
+static int floatformat_always_valid PARAMS ((const struct floatformat *fmt,
+ const char *from));
+
+static int
+floatformat_always_valid (fmt, from)
+ const struct floatformat *fmt;
+ const char *from;
+{
+ return 1;
+}
+
/* The odds that CHAR_BIT will be anything but 8 are low enough that I'm not
going to bother with trying to muck around with whether it is defined in
a system header, what we do if not, etc. */
{
floatformat_big, 32, 0, 1, 8, 127, 255, 9, 23,
floatformat_intbit_no,
- "floatformat_ieee_single_big"
+ "floatformat_ieee_single_big",
+ floatformat_always_valid
};
const struct floatformat floatformat_ieee_single_little =
{
floatformat_little, 32, 0, 1, 8, 127, 255, 9, 23,
floatformat_intbit_no,
- "floatformat_ieee_single_little"
+ "floatformat_ieee_single_little",
+ floatformat_always_valid
};
const struct floatformat floatformat_ieee_double_big =
{
floatformat_big, 64, 0, 1, 11, 1023, 2047, 12, 52,
floatformat_intbit_no,
- "floatformat_ieee_double_big"
+ "floatformat_ieee_double_big",
+ floatformat_always_valid
};
const struct floatformat floatformat_ieee_double_little =
{
floatformat_little, 64, 0, 1, 11, 1023, 2047, 12, 52,
floatformat_intbit_no,
- "floatformat_ieee_double_little"
+ "floatformat_ieee_double_little",
+ floatformat_always_valid
};
/* floatformat for IEEE double, little endian byte order, with big endian word
{
floatformat_littlebyte_bigword, 64, 0, 1, 11, 1023, 2047, 12, 52,
floatformat_intbit_no,
- "floatformat_ieee_double_littlebyte_bigword"
+ "floatformat_ieee_double_littlebyte_bigword",
+ floatformat_always_valid
};
+static int floatformat_i387_ext_is_valid PARAMS ((const struct floatformat *fmt, const char *from));
+
+static int
+floatformat_i387_ext_is_valid (fmt, from)
+ const struct floatformat *fmt;
+ const char *from;
+{
+ /* In the i387 double-extended format, if the exponent is all ones,
+ then the integer bit must be set. If the exponent is neither 0
+ nor ~0, the intbit must also be set. Only if the exponent is
+ zero can it be zero, and then it must be zero. */
+ unsigned long exponent, int_bit;
+ const unsigned char *ufrom = (const unsigned char *) from;
+
+ exponent = get_field (ufrom, fmt->byteorder, fmt->totalsize,
+ fmt->exp_start, fmt->exp_len);
+ int_bit = get_field (ufrom, fmt->byteorder, fmt->totalsize,
+ fmt->man_start, 1);
+
+ if ((exponent == 0) != (int_bit == 0))
+ return 0;
+ else
+ return 1;
+}
+
const struct floatformat floatformat_i387_ext =
{
floatformat_little, 80, 0, 1, 15, 0x3fff, 0x7fff, 16, 64,
floatformat_intbit_yes,
- "floatformat_i387_ext"
+ "floatformat_i387_ext",
+ floatformat_i387_ext_is_valid
};
const struct floatformat floatformat_m68881_ext =
{
/* Note that the bits from 16 to 31 are unused. */
floatformat_big, 96, 0, 1, 15, 0x3fff, 0x7fff, 32, 64,
floatformat_intbit_yes,
- "floatformat_m68881_ext"
+ "floatformat_m68881_ext",
+ floatformat_always_valid
};
const struct floatformat floatformat_i960_ext =
{
/* Note that the bits from 0 to 15 are unused. */
floatformat_little, 96, 16, 17, 15, 0x3fff, 0x7fff, 32, 64,
floatformat_intbit_yes,
- "floatformat_i960_ext"
+ "floatformat_i960_ext",
+ floatformat_always_valid
};
const struct floatformat floatformat_m88110_ext =
{
floatformat_big, 80, 0, 1, 15, 0x3fff, 0x7fff, 16, 64,
floatformat_intbit_yes,
- "floatformat_m88110_ext"
+ "floatformat_m88110_ext",
+ floatformat_always_valid
};
const struct floatformat floatformat_m88110_harris_ext =
{
double, and the last 64 bits are wasted. */
floatformat_big,128, 0, 1, 11, 0x3ff, 0x7ff, 12, 52,
floatformat_intbit_no,
- "floatformat_m88110_ext_harris"
-};
-const struct floatformat floatformat_arm_ext =
-{
- /* Bits 1 to 16 are unused. */
- floatformat_big, 96, 0, 17, 15, 0x3fff, 0x7fff, 32, 64,
- floatformat_intbit_yes,
- "floatformat_arm_ext"
+ "floatformat_m88110_ext_harris",
+ floatformat_always_valid
};
const struct floatformat floatformat_arm_ext_big =
{
/* Bits 1 to 16 are unused. */
floatformat_big, 96, 0, 17, 15, 0x3fff, 0x7fff, 32, 64,
floatformat_intbit_yes,
- "floatformat_arm_ext_big"
+ "floatformat_arm_ext_big",
+ floatformat_always_valid
};
const struct floatformat floatformat_arm_ext_littlebyte_bigword =
{
/* Bits 1 to 16 are unused. */
floatformat_littlebyte_bigword, 96, 0, 17, 15, 0x3fff, 0x7fff, 32, 64,
floatformat_intbit_yes,
- "floatformat_arm_ext_littlebyte_bigword"
+ "floatformat_arm_ext_littlebyte_bigword",
+ floatformat_always_valid
};
const struct floatformat floatformat_ia64_spill_big =
{
floatformat_big, 128, 0, 1, 17, 65535, 0x1ffff, 18, 64,
floatformat_intbit_yes,
- "floatformat_ia64_spill_big"
+ "floatformat_ia64_spill_big",
+ floatformat_always_valid
};
const struct floatformat floatformat_ia64_spill_little =
{
floatformat_little, 128, 0, 1, 17, 65535, 0x1ffff, 18, 64,
floatformat_intbit_yes,
- "floatformat_ia64_spill_little"
+ "floatformat_ia64_spill_little",
+ floatformat_always_valid
};
const struct floatformat floatformat_ia64_quad_big =
{
floatformat_big, 128, 0, 1, 15, 16383, 0x7fff, 16, 112,
floatformat_intbit_no,
- "floatformat_ia64_quad_big"
+ "floatformat_ia64_quad_big",
+ floatformat_always_valid
};
const struct floatformat floatformat_ia64_quad_little =
{
floatformat_little, 128, 0, 1, 15, 16383, 0x7fff, 16, 112,
floatformat_intbit_no,
- "floatformat_ia64_quad_little"
+ "floatformat_ia64_quad_little",
+ floatformat_always_valid
};
\f
-static unsigned long get_field PARAMS ((unsigned char *,
- enum floatformat_byteorders,
- unsigned int,
- unsigned int,
- unsigned int));
-
-/* Extract a field which starts at START and is LEN bytes long. DATA and
+/* Extract a field which starts at START and is LEN bits long. DATA and
TOTAL_LEN are the thing we are extracting it from, in byteorder ORDER. */
static unsigned long
get_field (data, order, total_len, start, len)
- unsigned char *data;
+ const unsigned char *data;
enum floatformat_byteorders order;
unsigned int total_len;
unsigned int start;
void
floatformat_to_double (fmt, from, to)
const struct floatformat *fmt;
- char *from;
+ const char *from;
double *to;
{
- unsigned char *ufrom = (unsigned char *)from;
+ const unsigned char *ufrom = (const unsigned char *)from;
double dto;
long exponent;
unsigned long mant;
unsigned int,
unsigned long));
-/* Set a field which starts at START and is LEN bytes long. DATA and
+/* Set a field which starts at START and is LEN bits long. DATA and
TOTAL_LEN are the thing we are extracting it from, in byteorder ORDER. */
static void
put_field (data, order, total_len, start, len, stuff_to_put)
void
floatformat_from_double (fmt, from, to)
const struct floatformat *fmt;
- double *from;
+ const double *from;
char *to;
{
double dfrom;
}
}
+/* Return non-zero iff the data at FROM is a valid number in format FMT. */
+
+int
+floatformat_is_valid (fmt, from)
+ const struct floatformat *fmt;
+ const char *from;
+{
+ return fmt->is_valid (fmt, from);
+}
+
#ifdef IEEE_DEBUG
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