| /* Intel 387 floating point stuff. |
| Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1998, 1999, 2000, 2001 |
| 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" |
| #include "regcache.h" |
| #include "gdb_assert.h" |
| |
| |
| /* FIXME: Eliminate the next two functions when we have the time to |
| change all the callers. */ |
| |
| void i387_to_double (char *from, char *to); |
| void double_to_i387 (char *from, char *to); |
| |
| void |
| i387_to_double (char *from, char *to) |
| { |
| floatformat_to_double (&floatformat_i387_ext, from, (double *) to); |
| } |
| |
| void |
| double_to_i387 (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 (unsigned int control); |
| static void print_387_status_bits (unsigned int status); |
| |
| static void |
| print_387_control_bits (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 (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 (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 (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; |
| int len = TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT; |
| char *tmp = alloca (len); |
| |
| /* This code only works on targets where ... */ |
| gdb_assert (TARGET_LONG_DOUBLE_FORMAT == &floatformat_i387_ext); |
| |
| /* Take care of the padding. FP reg is 80 bits. The same value in |
| memory is 96 bits. */ |
| gdb_assert (FPU_REG_RAW_SIZE < len); |
| memcpy (tmp, raw, FPU_REG_RAW_SIZE); |
| memset (tmp + FPU_REG_RAW_SIZE, 0, len - FPU_REG_RAW_SIZE); |
| |
| /* Extract the value as a DOUBLEST. */ |
| /* Use extract_floating() rather than floatformat_to_doublest(). |
| The latter is lossy in nature. Once GDB gets a host/target |
| independent and non-lossy FP it will become possible to bypass |
| extract_floating() and call floatformat*() directly. Note also |
| the assumptions about TARGET_LONG_DOUBLE above. */ |
| value = extract_floating (tmp, len); |
| |
| /* 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 & 0x0040) ? "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")); |
| } |