/* 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, 2002 Free Software Foundation, Inc.
This file is part of GDB.
#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);
}
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);
}
-void
-print_387_control_word (control)
- unsigned int control;
+\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. */
+
+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)
{
case 0:
- printf_unfiltered ("24 bits; ");
+ puts_unfiltered (" 24 bit; ");
break;
case 1:
- printf_unfiltered ("(bad); ");
+ puts_unfiltered (" (bad); ");
break;
case 2:
- printf_unfiltered ("53 bits; ");
+ puts_unfiltered (" 53 bit; ");
break;
case 3:
- printf_unfiltered ("64 bits; ");
+ puts_unfiltered (" 64 bit; ");
break;
}
- printf_unfiltered ("round ");
switch ((control >> 10) & 3)
{
case 0:
- printf_unfiltered ("NEAREST; ");
+ puts_unfiltered ("NEAR; ");
break;
case 1:
- printf_unfiltered ("DOWN; ");
+ puts_unfiltered ("DOWN; ");
break;
case 2:
- printf_unfiltered ("UP; ");
+ puts_unfiltered ("UP; ");
break;
case 3:
- printf_unfiltered ("CHOP; ");
+ puts_unfiltered ("CHOP; ");
break;
}
if (control & 0x3f)
{
- printf_unfiltered ("mask:");
+ puts_unfiltered ("mask");
if (control & 0x0001)
- printf_unfiltered (" INVALID");
+ puts_unfiltered (" INVAL");
if (control & 0x0002)
- printf_unfiltered (" DENORM");
+ puts_unfiltered (" DENOR");
if (control & 0x0004)
- printf_unfiltered (" DIVZ");
+ puts_unfiltered (" DIVZ");
if (control & 0x0008)
- printf_unfiltered (" OVERF");
+ puts_unfiltered (" OVERF");
if (control & 0x0010)
- printf_unfiltered (" UNDERF");
+ puts_unfiltered (" UNDER");
if (control & 0x0020)
- printf_unfiltered (" LOS");
- printf_unfiltered (";");
+ puts_unfiltered (" LOS");
+ puts_unfiltered (";");
}
- printf_unfiltered ("\n");
+
if (control & 0xe080)
- warning ("reserved bits on: %s\n",
+ 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_unfiltered ("status %s: ", local_hex_string (status));
- 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 ("; ");
- }
- printf_unfiltered ("flags: %d%d%d%d; ",
+ 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");
+}
+
+\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, 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);
- printf_unfiltered ("top %d\n", (status >> 11) & 7);
+ 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])
+\f
+
+/* 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));
+ }
+}
+\f
+
+/* 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);
+\f
+
+/* 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);
+ }
+ }
}
projects / deliverable / binutils-gdb.git / blobdiff