diff options
Diffstat (limited to 'contrib/gdb/gdb/i387-tdep.c')
| -rw-r--r-- | contrib/gdb/gdb/i387-tdep.c | 421 |
1 files changed, 350 insertions, 71 deletions
diff --git a/contrib/gdb/gdb/i387-tdep.c b/contrib/gdb/gdb/i387-tdep.c index 869ab9a..2a6f77c 100644 --- a/contrib/gdb/gdb/i387-tdep.c +++ b/contrib/gdb/gdb/i387-tdep.c @@ -1,111 +1,390 @@ /* Intel 387 floating point stuff. - Copyright (C) 1988, 1989, 1991, 1998 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 "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" +#include "doublest.h" -void i387_to_double PARAMS ((char *, char *)); +#include "i386-tdep.h" -void double_to_i387 PARAMS ((char *, char *)); +/* FIXME: Eliminate the next two functions when we have the time to + change all the callers. */ -/* FIXME: Eliminate these routines 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 (from, to) - char *from; - char *to; +i387_to_double (char *from, char *to) { - floatformat_to_double (&floatformat_i387_ext, from, (double *)to); + floatformat_to_double (&floatformat_i387_ext, from, (double *) to); } void -double_to_i387 (from, to) - char *from; - char *to; +double_to_i387 (char *from, char *to) { - floatformat_from_double (&floatformat_i387_ext, (double *)from, to); + floatformat_from_double (&floatformat_i387_ext, (double *) from, to); } -void -print_387_control_word (control) - unsigned int control; + +/* 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) { - printf_unfiltered ("control %s: ", local_hex_string(control)); - printf_unfiltered ("compute to "); - switch ((control >> 8) & 3) + switch ((control >> 8) & 3) { - case 0: printf_unfiltered ("24 bits; "); break; - case 1: printf_unfiltered ("(bad); "); break; - case 2: printf_unfiltered ("53 bits; "); break; - case 3: printf_unfiltered ("64 bits; "); break; + 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; } - printf_unfiltered ("round "); - switch ((control >> 10) & 3) + switch ((control >> 10) & 3) { - case 0: printf_unfiltered ("NEAREST; "); break; - case 1: printf_unfiltered ("DOWN; "); break; - case 2: printf_unfiltered ("UP; "); break; - case 3: printf_unfiltered ("CHOP; "); break; + 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) + if (control & 0x3f) { - printf_unfiltered ("mask:"); - if (control & 0x0001) printf_unfiltered (" INVALID"); - if (control & 0x0002) printf_unfiltered (" DENORM"); - if (control & 0x0004) printf_unfiltered (" DIVZ"); - if (control & 0x0008) printf_unfiltered (" OVERF"); - if (control & 0x0010) printf_unfiltered (" UNDERF"); - if (control & 0x0020) printf_unfiltered (" LOS"); - printf_unfiltered (";"); + 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 (";"); } - printf_unfiltered ("\n"); - if (control & 0xe080) warning ("reserved bits on: %s\n", - local_hex_string(control & 0xe080)); + + if (control & 0xe080) + warning ("\nreserved bits on: %s", + local_hex_string (control & 0xe080)); } void -print_387_status_word (status) - unsigned int status; +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 ("status %s: ", local_hex_string (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) { - printf_unfiltered ("exceptions:"); - if (status & 0x0001) printf_unfiltered (" INVALID"); - if (status & 0x0002) printf_unfiltered (" DENORM"); - if (status & 0x0004) printf_unfiltered (" DIVZ"); - if (status & 0x0008) printf_unfiltered (" OVERF"); - if (status & 0x0010) printf_unfiltered (" UNDERF"); - if (status & 0x0020) printf_unfiltered (" LOS"); - if (status & 0x0040) printf_unfiltered (" FPSTACK"); - printf_unfiltered ("; "); + 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; + + /* Using extract_typed_floating here might affect the representation + of certain numbers such as NaNs, even if GDB is running natively. + This is fine since our caller already detects such special + numbers and we print the hexadecimal representation anyway. */ + value = extract_typed_floating (raw, builtin_type_i387_ext); + + /* 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"); } - printf_unfiltered ("flags: %d%d%d%d; ", - (status & 0x4000) != 0, - (status & 0x0400) != 0, - (status & 0x0200) != 0, - (status & 0x0100) != 0); + 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"); - printf_unfiltered ("top %d\n", (status >> 11) & 7); + 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")); } |
