+ 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"));
+}
+
+/* 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);
+ }
+ }