/* Intel 387 floating point stuff.
- Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc.
+ Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1998, 1999, 2000, 2001
+ Free Software Foundation, Inc.
-This file is part of GDB.
+ This file is part of GDB.
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
-#include <stdio.h>
#include "defs.h"
#include "frame.h"
#include "inferior.h"
#include "language.h"
+#include "value.h"
#include "gdbcore.h"
-#include "ieee-float.h"
+#include "floatformat.h"
+#include "regcache.h"
-#ifdef USG
-#include <sys/types.h>
-#endif
-#include <sys/param.h>
-#include <sys/dir.h>
-#include <signal.h>
-#include <sys/user.h>
-#include <sys/ioctl.h>
-#include <fcntl.h>
+/* FIXME: Eliminate the next two functions when we have the time to
+ change all the callers. */
-#include <sys/file.h>
-#include <sys/stat.h>
+void i387_to_double (char *from, char *to);
+void double_to_i387 (char *from, char *to);
-#include <sys/reg.h>
+void
+i387_to_double (char *from, char *to)
+{
+ floatformat_to_double (&floatformat_i387_ext, from, (double *) to);
+}
-struct ext_format ext_format_i387 = {
-/* tot sbyte smask expbyte manbyte */
- 10, 9, 0x80, 9,8, 4,0 /* i387 */
-};
+void
+double_to_i387 (char *from, char *to)
+{
+ floatformat_from_double (&floatformat_i387_ext, (double *) from, to);
+}
-/* FIXME: Eliminate these routines when we have the time to change all
- the callers. */
+\f
+/* FIXME: The functions on this page are used by the old `info float'
+ implementations that a few of the i386 targets provide. These
+ functions should be removed if all of these have been converted to
+ use the generic implementation based on the new register file
+ layout. */
-void
-i387_to_double (from, to)
- char *from;
- char *to;
+static void print_387_control_bits (unsigned int control);
+static void print_387_status_bits (unsigned int status);
+
+static void
+print_387_control_bits (unsigned int control)
{
- ieee_extended_to_double (&ext_format_i387, from, (double *)to);
+ switch ((control >> 8) & 3)
+ {
+ case 0:
+ puts_unfiltered (" 24 bit; ");
+ break;
+ case 1:
+ puts_unfiltered (" (bad); ");
+ break;
+ case 2:
+ puts_unfiltered (" 53 bit; ");
+ break;
+ case 3:
+ puts_unfiltered (" 64 bit; ");
+ break;
+ }
+ switch ((control >> 10) & 3)
+ {
+ case 0:
+ puts_unfiltered ("NEAR; ");
+ break;
+ case 1:
+ puts_unfiltered ("DOWN; ");
+ break;
+ case 2:
+ puts_unfiltered ("UP; ");
+ break;
+ case 3:
+ puts_unfiltered ("CHOP; ");
+ break;
+ }
+ if (control & 0x3f)
+ {
+ puts_unfiltered ("mask");
+ if (control & 0x0001)
+ puts_unfiltered (" INVAL");
+ if (control & 0x0002)
+ puts_unfiltered (" DENOR");
+ if (control & 0x0004)
+ puts_unfiltered (" DIVZ");
+ if (control & 0x0008)
+ puts_unfiltered (" OVERF");
+ if (control & 0x0010)
+ puts_unfiltered (" UNDER");
+ if (control & 0x0020)
+ puts_unfiltered (" LOS");
+ puts_unfiltered (";");
+ }
+
+ if (control & 0xe080)
+ warning ("\nreserved bits on: %s",
+ local_hex_string (control & 0xe080));
}
void
-double_to_i387 (from, to)
- char *from;
- char *to;
+print_387_control_word (unsigned int control)
{
- double_to_ieee_extended (&ext_format_i387, (double *)from, to);
+ printf_filtered ("control %s:", local_hex_string(control & 0xffff));
+ print_387_control_bits (control);
+ puts_unfiltered ("\n");
+}
+
+static void
+print_387_status_bits (unsigned int status)
+{
+ printf_unfiltered (" flags %d%d%d%d; ",
+ (status & 0x4000) != 0,
+ (status & 0x0400) != 0,
+ (status & 0x0200) != 0,
+ (status & 0x0100) != 0);
+ printf_unfiltered ("top %d; ", (status >> 11) & 7);
+ if (status & 0xff)
+ {
+ puts_unfiltered ("excep");
+ if (status & 0x0001) puts_unfiltered (" INVAL");
+ if (status & 0x0002) puts_unfiltered (" DENOR");
+ if (status & 0x0004) puts_unfiltered (" DIVZ");
+ if (status & 0x0008) puts_unfiltered (" OVERF");
+ if (status & 0x0010) puts_unfiltered (" UNDER");
+ if (status & 0x0020) puts_unfiltered (" LOS");
+ if (status & 0x0040) puts_unfiltered (" STACK");
+ }
}
void
-print_387_control_word (control)
- unsigned int control;
+print_387_status_word (unsigned int status)
+{
+ printf_filtered ("status %s:", local_hex_string (status & 0xffff));
+ print_387_status_bits (status);
+ puts_unfiltered ("\n");
+}
+
+\f
+/* Implement the `info float' layout based on the register definitions
+ in `tm-i386.h'. */
+
+/* Print the floating point number specified by RAW. */
+static void
+print_i387_value (char *raw)
{
- printf ("control %s: ", local_hex_string(control));
- printf ("compute to ");
- switch ((control >> 8) & 3)
+ DOUBLEST value;
+
+ /* Avoid call to floatformat_to_doublest if possible to preserve as
+ much information as possible. */
+
+#ifdef HAVE_LONG_DOUBLE
+ if (sizeof (value) == sizeof (long double)
+ && HOST_LONG_DOUBLE_FORMAT == &floatformat_i387_ext)
{
- case 0: printf ("24 bits; "); break;
- case 1: printf ("(bad); "); break;
- case 2: printf ("53 bits; "); break;
- case 3: printf ("64 bits; "); break;
+ /* Copy straight over, but take care of the padding. */
+ memcpy (&value, raw, FPU_REG_RAW_SIZE);
+ memset ((char *) &value + FPU_REG_RAW_SIZE, 0,
+ sizeof (value) - FPU_REG_RAW_SIZE);
}
- printf ("round ");
- switch ((control >> 10) & 3)
+ else
+#endif
+ floatformat_to_doublest (&floatformat_i387_ext, raw, &value);
+
+ /* We try to print 19 digits. The last digit may or may not contain
+ garbage, but we'd better print one too many. We need enough room
+ to print the value, 1 position for the sign, 1 for the decimal
+ point, 19 for the digits and 6 for the exponent adds up to 27. */
+#ifdef PRINTF_HAS_LONG_DOUBLE
+ printf_filtered (" %-+27.19Lg", (long double) value);
+#else
+ printf_filtered (" %-+27.19g", (double) value);
+#endif
+}
+
+/* Print the classification for the register contents RAW. */
+static void
+print_i387_ext (unsigned char *raw)
+{
+ int sign;
+ int integer;
+ unsigned int exponent;
+ unsigned long fraction[2];
+
+ sign = raw[9] & 0x80;
+ integer = raw[7] & 0x80;
+ exponent = (((raw[9] & 0x7f) << 8) | raw[8]);
+ fraction[0] = ((raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0]);
+ fraction[1] = (((raw[7] & 0x7f) << 24) | (raw[6] << 16)
+ | (raw[5] << 8) | raw[4]);
+
+ if (exponent == 0x7fff && integer)
{
- case 0: printf ("NEAREST; "); break;
- case 1: printf ("DOWN; "); break;
- case 2: printf ("UP; "); break;
- case 3: printf ("CHOP; "); break;
+ if (fraction[0] == 0x00000000 && fraction[1] == 0x00000000)
+ /* Infinity. */
+ printf_filtered (" %cInf", (sign ? '-' : '+'));
+ else if (sign && fraction[0] == 0x00000000 && fraction[1] == 0x40000000)
+ /* Real Indefinite (QNaN). */
+ puts_unfiltered (" Real Indefinite (QNaN)");
+ else if (fraction[1] & 0x40000000)
+ /* QNaN. */
+ puts_filtered (" QNaN");
+ else
+ /* SNaN. */
+ puts_filtered (" SNaN");
}
- if (control & 0x3f)
+ else if (exponent < 0x7fff && exponent > 0x0000 && integer)
+ /* Normal. */
+ print_i387_value (raw);
+ else if (exponent == 0x0000)
{
- printf ("mask:");
- if (control & 0x0001) printf (" INVALID");
- if (control & 0x0002) printf (" DENORM");
- if (control & 0x0004) printf (" DIVZ");
- if (control & 0x0008) printf (" OVERF");
- if (control & 0x0010) printf (" UNDERF");
- if (control & 0x0020) printf (" LOS");
- printf (";");
+ /* Denormal or zero. */
+ print_i387_value (raw);
+
+ if (integer)
+ /* Pseudo-denormal. */
+ puts_filtered (" Pseudo-denormal");
+ else if (fraction[0] || fraction[1])
+ /* Denormal. */
+ puts_filtered (" Denormal");
}
- printf ("\n");
- if (control & 0xe080) printf ("warning: reserved bits on: %s\n",
- local_hex_string(control & 0xe080));
+ else
+ /* Unsupported. */
+ puts_filtered (" Unsupported");
}
-void
-print_387_status_word (status)
- unsigned int status;
+/* Print the status word STATUS. */
+static void
+print_i387_status_word (unsigned int status)
{
- printf ("status %s: ", local_hex_string (status));
- if (status & 0xff)
+ printf_filtered ("Status Word: %s",
+ local_hex_string_custom (status, "04"));
+ puts_filtered (" ");
+ printf_filtered (" %s", (status & 0x0001) ? "IE" : " ");
+ printf_filtered (" %s", (status & 0x0002) ? "DE" : " ");
+ printf_filtered (" %s", (status & 0x0004) ? "ZE" : " ");
+ printf_filtered (" %s", (status & 0x0008) ? "OE" : " ");
+ printf_filtered (" %s", (status & 0x0010) ? "UE" : " ");
+ printf_filtered (" %s", (status & 0x0020) ? "PE" : " ");
+ puts_filtered (" ");
+ printf_filtered (" %s", (status & 0x0080) ? "ES" : " ");
+ puts_filtered (" ");
+ printf_filtered (" %s", (status & 0x0080) ? "SF" : " ");
+ puts_filtered (" ");
+ printf_filtered (" %s", (status & 0x0100) ? "C0" : " ");
+ printf_filtered (" %s", (status & 0x0200) ? "C1" : " ");
+ printf_filtered (" %s", (status & 0x0400) ? "C2" : " ");
+ printf_filtered (" %s", (status & 0x4000) ? "C3" : " ");
+
+ puts_filtered ("\n");
+
+ printf_filtered (" TOP: %d\n", ((status >> 11) & 7));
+}
+
+/* Print the control word CONTROL. */
+static void
+print_i387_control_word (unsigned int control)
+{
+ printf_filtered ("Control Word: %s",
+ local_hex_string_custom (control, "04"));
+ puts_filtered (" ");
+ printf_filtered (" %s", (control & 0x0001) ? "IM" : " ");
+ printf_filtered (" %s", (control & 0x0002) ? "DM" : " ");
+ printf_filtered (" %s", (control & 0x0004) ? "ZM" : " ");
+ printf_filtered (" %s", (control & 0x0008) ? "OM" : " ");
+ printf_filtered (" %s", (control & 0x0010) ? "UM" : " ");
+ printf_filtered (" %s", (control & 0x0020) ? "PM" : " ");
+
+ puts_filtered ("\n");
+
+ puts_filtered (" PC: ");
+ switch ((control >> 8) & 3)
+ {
+ case 0:
+ puts_filtered ("Single Precision (24-bits)\n");
+ break;
+ case 1:
+ puts_filtered ("Reserved\n");
+ break;
+ case 2:
+ puts_filtered ("Double Precision (53-bits)\n");
+ break;
+ case 3:
+ puts_filtered ("Extended Precision (64-bits)\n");
+ break;
+ }
+
+ puts_filtered (" RC: ");
+ switch ((control >> 10) & 3)
{
- printf ("exceptions:");
- if (status & 0x0001) printf (" INVALID");
- if (status & 0x0002) printf (" DENORM");
- if (status & 0x0004) printf (" DIVZ");
- if (status & 0x0008) printf (" OVERF");
- if (status & 0x0010) printf (" UNDERF");
- if (status & 0x0020) printf (" LOS");
- if (status & 0x0040) printf (" FPSTACK");
- printf ("; ");
+ case 0:
+ puts_filtered ("Round to nearest\n");
+ break;
+ case 1:
+ puts_filtered ("Round down\n");
+ break;
+ case 2:
+ puts_filtered ("Round up\n");
+ break;
+ case 3:
+ puts_filtered ("Round toward zero\n");
+ break;
}
- printf ("flags: %d%d%d%d; ",
- (status & 0x4000) != 0,
- (status & 0x0400) != 0,
- (status & 0x0200) != 0,
- (status & 0x0100) != 0);
+}
+
+/* Print out the i387 floating poin state. */
+void
+i387_float_info (void)
+{
+ unsigned int fctrl;
+ unsigned int fstat;
+ unsigned int ftag;
+ unsigned int fiseg;
+ unsigned int fioff;
+ unsigned int foseg;
+ unsigned int fooff;
+ unsigned int fop;
+ int fpreg;
+ int top;
+
+ fctrl = read_register (FCTRL_REGNUM);
+ fstat = read_register (FSTAT_REGNUM);
+ ftag = read_register (FTAG_REGNUM);
+ fiseg = read_register (FCS_REGNUM);
+ fioff = read_register (FCOFF_REGNUM);
+ foseg = read_register (FDS_REGNUM);
+ fooff = read_register (FDOFF_REGNUM);
+ fop = read_register (FOP_REGNUM);
- printf ("top %d\n", (status >> 11) & 7);
+ top = ((fstat >> 11) & 7);
+
+ for (fpreg = 7; fpreg >= 0; fpreg--)
+ {
+ unsigned char raw[FPU_REG_RAW_SIZE];
+ int tag = (ftag >> (fpreg * 2)) & 3;
+ int i;
+
+ printf_filtered ("%sR%d: ", fpreg == top ? "=>" : " ", fpreg);
+
+ switch (tag)
+ {
+ case 0:
+ puts_filtered ("Valid ");
+ break;
+ case 1:
+ puts_filtered ("Zero ");
+ break;
+ case 2:
+ puts_filtered ("Special ");
+ break;
+ case 3:
+ puts_filtered ("Empty ");
+ break;
+ }
+
+ read_register_gen ((fpreg + 8 - top) % 8 + FP0_REGNUM, raw);
+
+ puts_filtered ("0x");
+ for (i = 9; i >= 0; i--)
+ printf_filtered ("%02x", raw[i]);
+
+ if (tag != 3)
+ print_i387_ext (raw);
+
+ puts_filtered ("\n");
+ }
+
+ puts_filtered ("\n");
+
+ print_i387_status_word (fstat);
+ print_i387_control_word (fctrl);
+ printf_filtered ("Tag Word: %s\n",
+ local_hex_string_custom (ftag, "04"));
+ printf_filtered ("Instruction Pointer: %s:",
+ local_hex_string_custom (fiseg, "02"));
+ printf_filtered ("%s\n", local_hex_string_custom (fioff, "08"));
+ printf_filtered ("Operand Pointer: %s:",
+ local_hex_string_custom (foseg, "02"));
+ printf_filtered ("%s\n", local_hex_string_custom (fooff, "08"));
+ printf_filtered ("Opcode: %s\n",
+ local_hex_string_custom (fop ? (fop | 0xd800) : 0, "04"));
}
projects / deliverable / binutils-gdb.git / blobdiff