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Diffstat (limited to 'gdb/i387-tdep.c')
| -rw-r--r-- | gdb/i387-tdep.c | 710 |
1 files changed, 0 insertions, 710 deletions
diff --git a/gdb/i387-tdep.c b/gdb/i387-tdep.c deleted file mode 100644 index 3d4b397..0000000 --- a/gdb/i387-tdep.c +++ /dev/null @@ -1,710 +0,0 @@ -/* Intel 387 floating point stuff. - Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1998, 1999, 2000, - 2001, 2002 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" -#include "gdb_string.h" -#include "doublest.h" - -#include "i386-tdep.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, struct ui_file *file) -{ - 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 - fprintf_filtered (file, " %-+27.19Lg", (long double) value); -#else - fprintf_filtered (file, " %-+27.19g", (double) value); -#endif -} - -/* Print the classification for the register contents RAW. */ -static void -print_i387_ext (unsigned char *raw, struct ui_file *file) -{ - 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. */ - fprintf_filtered (file, " %cInf", (sign ? '-' : '+')); - else if (sign && fraction[0] == 0x00000000 && fraction[1] == 0x40000000) - /* Real Indefinite (QNaN). */ - fputs_unfiltered (" Real Indefinite (QNaN)", file); - else if (fraction[1] & 0x40000000) - /* QNaN. */ - fputs_filtered (" QNaN", file); - else - /* SNaN. */ - fputs_filtered (" SNaN", file); - } - else if (exponent < 0x7fff && exponent > 0x0000 && integer) - /* Normal. */ - print_i387_value (raw, file); - else if (exponent == 0x0000) - { - /* Denormal or zero. */ - print_i387_value (raw, file); - - if (integer) - /* Pseudo-denormal. */ - fputs_filtered (" Pseudo-denormal", file); - else if (fraction[0] || fraction[1]) - /* Denormal. */ - fputs_filtered (" Denormal", file); - } - else - /* Unsupported. */ - fputs_filtered (" Unsupported", file); -} - -/* Print the status word STATUS. */ -static void -print_i387_status_word (unsigned int status, struct ui_file *file) -{ - fprintf_filtered (file, "Status Word: %s", - local_hex_string_custom (status, "04")); - fputs_filtered (" ", file); - fprintf_filtered (file, " %s", (status & 0x0001) ? "IE" : " "); - fprintf_filtered (file, " %s", (status & 0x0002) ? "DE" : " "); - fprintf_filtered (file, " %s", (status & 0x0004) ? "ZE" : " "); - fprintf_filtered (file, " %s", (status & 0x0008) ? "OE" : " "); - fprintf_filtered (file, " %s", (status & 0x0010) ? "UE" : " "); - fprintf_filtered (file, " %s", (status & 0x0020) ? "PE" : " "); - fputs_filtered (" ", file); - fprintf_filtered (file, " %s", (status & 0x0080) ? "ES" : " "); - fputs_filtered (" ", file); - fprintf_filtered (file, " %s", (status & 0x0040) ? "SF" : " "); - fputs_filtered (" ", file); - fprintf_filtered (file, " %s", (status & 0x0100) ? "C0" : " "); - fprintf_filtered (file, " %s", (status & 0x0200) ? "C1" : " "); - fprintf_filtered (file, " %s", (status & 0x0400) ? "C2" : " "); - fprintf_filtered (file, " %s", (status & 0x4000) ? "C3" : " "); - - fputs_filtered ("\n", file); - - fprintf_filtered (file, - " TOP: %d\n", ((status >> 11) & 7)); -} - -/* Print the control word CONTROL. */ -static void -print_i387_control_word (unsigned int control, struct ui_file *file) -{ - fprintf_filtered (file, "Control Word: %s", - local_hex_string_custom (control, "04")); - fputs_filtered (" ", file); - fprintf_filtered (file, " %s", (control & 0x0001) ? "IM" : " "); - fprintf_filtered (file, " %s", (control & 0x0002) ? "DM" : " "); - fprintf_filtered (file, " %s", (control & 0x0004) ? "ZM" : " "); - fprintf_filtered (file, " %s", (control & 0x0008) ? "OM" : " "); - fprintf_filtered (file, " %s", (control & 0x0010) ? "UM" : " "); - fprintf_filtered (file, " %s", (control & 0x0020) ? "PM" : " "); - - fputs_filtered ("\n", file); - - fputs_filtered (" PC: ", file); - switch ((control >> 8) & 3) - { - case 0: - fputs_filtered ("Single Precision (24-bits)\n", file); - break; - case 1: - fputs_filtered ("Reserved\n", file); - break; - case 2: - fputs_filtered ("Double Precision (53-bits)\n", file); - break; - case 3: - fputs_filtered ("Extended Precision (64-bits)\n", file); - break; - } - - fputs_filtered (" RC: ", file); - switch ((control >> 10) & 3) - { - case 0: - fputs_filtered ("Round to nearest\n", file); - break; - case 1: - fputs_filtered ("Round down\n", file); - break; - case 2: - fputs_filtered ("Round up\n", file); - break; - case 3: - fputs_filtered ("Round toward zero\n", file); - break; - } -} - -/* Print out the i387 floating point state. Note that we ignore FRAME - in the code below. That's OK since floating-point registers are - never saved on the stack. */ - -void -i387_print_float_info (struct gdbarch *gdbarch, struct ui_file *file, - struct frame_info *frame, const char *args) -{ - 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; - - fprintf_filtered (file, "%sR%d: ", fpreg == top ? "=>" : " ", fpreg); - - switch (tag) - { - case 0: - fputs_filtered ("Valid ", file); - break; - case 1: - fputs_filtered ("Zero ", file); - break; - case 2: - fputs_filtered ("Special ", file); - break; - case 3: - fputs_filtered ("Empty ", file); - break; - } - - read_register_gen ((fpreg + 8 - top) % 8 + FP0_REGNUM, raw); - - fputs_filtered ("0x", file); - for (i = 9; i >= 0; i--) - fprintf_filtered (file, "%02x", raw[i]); - - if (tag != 3) - print_i387_ext (raw, file); - - fputs_filtered ("\n", file); - } - - puts_filtered ("\n"); - - print_i387_status_word (fstat, file); - print_i387_control_word (fctrl, file); - fprintf_filtered (file, "Tag Word: %s\n", - local_hex_string_custom (ftag, "04")); - fprintf_filtered (file, "Instruction Pointer: %s:", - local_hex_string_custom (fiseg, "02")); - fprintf_filtered (file, "%s\n", local_hex_string_custom (fioff, "08")); - fprintf_filtered (file, "Operand Pointer: %s:", - local_hex_string_custom (foseg, "02")); - fprintf_filtered (file, "%s\n", local_hex_string_custom (fooff, "08")); - fprintf_filtered (file, "Opcode: %s\n", - local_hex_string_custom (fop ? (fop | 0xd800) : 0, "04")); -} - -/* FIXME: kettenis/2000-05-21: Right now more than a few i386 targets - define their own routines to manage the floating-point registers in - GDB's register array. Most (if not all) of these targets use the - format used by the "fsave" instruction in their communication with - the OS. They should all be converted to use the routines below. */ - -/* At fsave_offset[REGNUM] you'll find the offset to the location in - the data structure used by the "fsave" instruction where GDB - register REGNUM is stored. */ - -static int fsave_offset[] = -{ - 28 + 0 * FPU_REG_RAW_SIZE, /* FP0_REGNUM through ... */ - 28 + 1 * FPU_REG_RAW_SIZE, - 28 + 2 * FPU_REG_RAW_SIZE, - 28 + 3 * FPU_REG_RAW_SIZE, - 28 + 4 * FPU_REG_RAW_SIZE, - 28 + 5 * FPU_REG_RAW_SIZE, - 28 + 6 * FPU_REG_RAW_SIZE, - 28 + 7 * FPU_REG_RAW_SIZE, /* ... FP7_REGNUM. */ - 0, /* FCTRL_REGNUM (16 bits). */ - 4, /* FSTAT_REGNUM (16 bits). */ - 8, /* FTAG_REGNUM (16 bits). */ - 16, /* FISEG_REGNUM (16 bits). */ - 12, /* FIOFF_REGNUM. */ - 24, /* FOSEG_REGNUM. */ - 20, /* FOOFF_REGNUM. */ - 18 /* FOP_REGNUM (bottom 11 bits). */ -}; - -#define FSAVE_ADDR(fsave, regnum) (fsave + fsave_offset[regnum - FP0_REGNUM]) - - -/* Fill register REGNUM in GDB's register array with the appropriate - value from *FSAVE. This function masks off any of the reserved - bits in *FSAVE. */ - -void -i387_supply_register (int regnum, char *fsave) -{ - /* Most of the FPU control registers occupy only 16 bits in - the fsave area. Give those a special treatment. */ - if (regnum >= FPC_REGNUM - && regnum != FIOFF_REGNUM && regnum != FOOFF_REGNUM) - { - unsigned char val[4]; - - memcpy (val, FSAVE_ADDR (fsave, regnum), 2); - val[2] = val[3] = 0; - if (regnum == FOP_REGNUM) - val[1] &= ((1 << 3) - 1); - supply_register (regnum, val); - } - else - supply_register (regnum, FSAVE_ADDR (fsave, regnum)); -} - -/* Fill GDB's register array with the floating-point register values - in *FSAVE. This function masks off any of the reserved - bits in *FSAVE. */ - -void -i387_supply_fsave (char *fsave) -{ - int i; - - for (i = FP0_REGNUM; i < XMM0_REGNUM; i++) - i387_supply_register (i, fsave); -} - -/* Fill register REGNUM (if it is a floating-point register) in *FSAVE - with the value in GDB's register array. If REGNUM is -1, do this - for all registers. This function doesn't touch any of the reserved - bits in *FSAVE. */ - -void -i387_fill_fsave (char *fsave, int regnum) -{ - int i; - - for (i = FP0_REGNUM; i < XMM0_REGNUM; i++) - if (regnum == -1 || regnum == i) - { - /* Most of the FPU control registers occupy only 16 bits in - the fsave area. Give those a special treatment. */ - if (i >= FPC_REGNUM - && i != FIOFF_REGNUM && i != FOOFF_REGNUM) - { - unsigned char buf[4]; - - regcache_collect (i, buf); - - if (i == FOP_REGNUM) - { - /* The opcode occupies only 11 bits. Make sure we - don't touch the other bits. */ - buf[1] &= ((1 << 3) - 1); - buf[1] |= ((FSAVE_ADDR (fsave, i))[1] & ~((1 << 3) - 1)); - } - memcpy (FSAVE_ADDR (fsave, i), buf, 2); - } - else - regcache_collect (i, FSAVE_ADDR (fsave, i)); - } -} - - -/* At fxsave_offset[REGNUM] you'll find the offset to the location in - the data structure used by the "fxsave" instruction where GDB - register REGNUM is stored. */ - -static int fxsave_offset[] = -{ - 32, /* FP0_REGNUM through ... */ - 48, - 64, - 80, - 96, - 112, - 128, - 144, /* ... FP7_REGNUM (80 bits each). */ - 0, /* FCTRL_REGNUM (16 bits). */ - 2, /* FSTAT_REGNUM (16 bits). */ - 4, /* FTAG_REGNUM (16 bits). */ - 12, /* FISEG_REGNUM (16 bits). */ - 8, /* FIOFF_REGNUM. */ - 20, /* FOSEG_REGNUM (16 bits). */ - 16, /* FOOFF_REGNUM. */ - 6, /* FOP_REGNUM (bottom 11 bits). */ - 160, /* XMM0_REGNUM through ... */ - 176, - 192, - 208, - 224, - 240, - 256, - 272, /* ... XMM7_REGNUM (128 bits each). */ - 24, /* MXCSR_REGNUM. */ -}; - -#define FXSAVE_ADDR(fxsave, regnum) \ - (fxsave + fxsave_offset[regnum - FP0_REGNUM]) - -static int i387_tag (unsigned char *raw); - - -/* Fill GDB's register array with the floating-point and SSE register - values in *FXSAVE. This function masks off any of the reserved - bits in *FXSAVE. */ - -void -i387_supply_fxsave (char *fxsave) -{ - int i, last_regnum = MXCSR_REGNUM; - - if (gdbarch_tdep (current_gdbarch)->num_xmm_regs == 0) - last_regnum = FOP_REGNUM; - - for (i = FP0_REGNUM; i <= last_regnum; i++) - { - /* Most of the FPU control registers occupy only 16 bits in - the fxsave area. Give those a special treatment. */ - if (i >= FPC_REGNUM && i < XMM0_REGNUM - && i != FIOFF_REGNUM && i != FOOFF_REGNUM) - { - unsigned char val[4]; - - memcpy (val, FXSAVE_ADDR (fxsave, i), 2); - val[2] = val[3] = 0; - if (i == FOP_REGNUM) - val[1] &= ((1 << 3) - 1); - else if (i== FTAG_REGNUM) - { - /* The fxsave area contains a simplified version of the - tag word. We have to look at the actual 80-bit FP - data to recreate the traditional i387 tag word. */ - - unsigned long ftag = 0; - int fpreg; - int top; - - top = (((FXSAVE_ADDR (fxsave, FSTAT_REGNUM))[1] >> 3) & 0x7); - - for (fpreg = 7; fpreg >= 0; fpreg--) - { - int tag; - - if (val[0] & (1 << fpreg)) - { - int regnum = (fpreg + 8 - top) % 8 + FP0_REGNUM; - tag = i387_tag (FXSAVE_ADDR (fxsave, regnum)); - } - else - tag = 3; /* Empty */ - - ftag |= tag << (2 * fpreg); - } - val[0] = ftag & 0xff; - val[1] = (ftag >> 8) & 0xff; - } - supply_register (i, val); - } - else - supply_register (i, FXSAVE_ADDR (fxsave, i)); - } -} - -/* Fill register REGNUM (if it is a floating-point or SSE register) in - *FXSAVE with the value in GDB's register array. If REGNUM is -1, do - this for all registers. This function doesn't touch any of the - reserved bits in *FXSAVE. */ - -void -i387_fill_fxsave (char *fxsave, int regnum) -{ - int i, last_regnum = MXCSR_REGNUM; - - if (gdbarch_tdep (current_gdbarch)->num_xmm_regs == 0) - last_regnum = FOP_REGNUM; - - for (i = FP0_REGNUM; i <= last_regnum; i++) - if (regnum == -1 || regnum == i) - { - /* Most of the FPU control registers occupy only 16 bits in - the fxsave area. Give those a special treatment. */ - if (i >= FPC_REGNUM && i < XMM0_REGNUM - && i != FIOFF_REGNUM && i != FDOFF_REGNUM) - { - unsigned char buf[4]; - - regcache_collect (i, buf); - - if (i == FOP_REGNUM) - { - /* The opcode occupies only 11 bits. Make sure we - don't touch the other bits. */ - buf[1] &= ((1 << 3) - 1); - buf[1] |= ((FXSAVE_ADDR (fxsave, i))[1] & ~((1 << 3) - 1)); - } - else if (i == FTAG_REGNUM) - { - /* Converting back is much easier. */ - - unsigned short ftag; - int fpreg; - - ftag = (buf[1] << 8) | buf[0]; - buf[0] = 0; - buf[1] = 0; - - for (fpreg = 7; fpreg >= 0; fpreg--) - { - int tag = (ftag >> (fpreg * 2)) & 3; - - if (tag != 3) - buf[0] |= (1 << fpreg); - } - } - memcpy (FXSAVE_ADDR (fxsave, i), buf, 2); - } - else - regcache_collect (i, FXSAVE_ADDR (fxsave, i)); - } -} - -/* Recreate the FTW (tag word) valid bits from the 80-bit FP data in - *RAW. */ - -static int -i387_tag (unsigned char *raw) -{ - int integer; - unsigned int exponent; - unsigned long fraction[2]; - - 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) - { - /* Special. */ - return (2); - } - else if (exponent == 0x0000) - { - if (fraction[0] == 0x0000 && fraction[1] == 0x0000 && !integer) - { - /* Zero. */ - return (1); - } - else - { - /* Special. */ - return (2); - } - } - else - { - if (integer) - { - /* Valid. */ - return (0); - } - else - { - /* Special. */ - return (2); - } - } -} |