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[/] [or1k/] [trunk/] [gdb-5.0/] [gdb/] [i387-tdep.c] - Rev 105
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/* Intel 387 floating point stuff. Copyright (C) 1988, 89, 91, 98, 99, 2000 Free Software Foundation, Inc. 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 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "defs.h" #include "frame.h" #include "inferior.h" #include "language.h" #include "value.h" #include "gdbcore.h" #include "floatformat.h" /* FIXME: Eliminate the next two functions when we have the time to change all the callers. */ void i387_to_double PARAMS ((char *from, char *to)); void double_to_i387 PARAMS ((char *from, char *to)); void i387_to_double (from, to) char *from; char *to; { floatformat_to_double (&floatformat_i387_ext, from, (double *) to); } void double_to_i387 (from, to) char *from; char *to; { floatformat_from_double (&floatformat_i387_ext, (double *) from, to); } /* 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. */ static void print_387_control_bits PARAMS ((unsigned int control)); static void print_387_status_bits PARAMS ((unsigned int status)); static void print_387_control_bits (control) unsigned int control; { 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 print_387_control_word (control) unsigned int control; { printf_filtered ("control %s:", local_hex_string(control & 0xffff)); print_387_control_bits (control); puts_unfiltered ("\n"); } static void print_387_status_bits (status) 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_status_word (status) unsigned int status; { printf_filtered ("status %s:", local_hex_string (status & 0xffff)); print_387_status_bits (status); puts_unfiltered ("\n"); } /* 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) { 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) { /* Copy straight over, but take care of the padding. */ memcpy (&value, raw, FPU_REG_RAW_SIZE); memset (&value + FPU_REG_RAW_SIZE, 0, sizeof (value) - FPU_REG_RAW_SIZE); } 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) { 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"); } else if (exponent < 0x7fff && exponent > 0x0000 && integer) /* Normal. */ print_i387_value (raw); else if (exponent == 0x0000) { /* 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"); } else /* Unsupported. */ puts_filtered (" Unsupported"); } /* Print the status word STATUS. */ static void print_i387_status_word (unsigned int status) { 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) { 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; } } /* 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); 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")); }
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