* i387-nat.h (i387_supply_fsave, i387_fill_fsave): Make extern.

(i387_supply_fxsave, i387_fill_fxsave): New prototypes.
* i387-nat.c (i387_supply_fsave): Declare `val' as `unsigned int'.
(fxsave_offset): New variable.
(FXSAVE_ADDR): New macro.
(i387_supply_fxsave, i387_fill_fxsave, i387_tag): New functions.

1 files changed, 209 insertions, 2 deletions

diff --git a/gdb/i387-nat.c b/gdb/i387-nat.c
index 17e67b47a32..76986080e12 100644
--- a/gdb/i387-nat.c
+++ b/gdb/i387-nat.c
@@ -1,5 +1,5 @@
 /* Native-dependent code for the i387.
-   Copyright (C) 2000 Free Software Foundation, Inc.
+   Copyright 2000 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -71,7 +71,7 @@ i387_supply_fsave (char *fsave)
       if (i >= FIRST_FPU_CTRL_REGNUM
 	  && i != FCOFF_REGNUM && i != FDOFF_REGNUM)
 	{
-	  unsigned val = *(unsigned short *) (FSAVE_ADDR (fsave, i));
+	  unsigned int val = *(unsigned short *) (FSAVE_ADDR (fsave, i));
 
 	  if (i == FOP_REGNUM)
 	    {
@@ -123,3 +123,210 @@ i387_fill_fsave (char *fsave, int regno)
 		  REGISTER_RAW_SIZE (i));
       }
 }
+
+
+/* At fxsave_offset[REGNO] you'll find the offset to the location in
+   the data structure used by the "fxsave" instruction where GDB
+   register REGNO 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,				/* FCS_REGNUM (16 bits).  */
+  8,				/* FCOFF_REGNUM.  */
+  20,				/* FDS_REGNUM (16 bits).  */
+  16,				/* FDOFF_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;
+
+  for (i = FP0_REGNUM; i <= MXCSR_REGNUM; i++)
+    {
+      /* Most of the FPU control registers occupy only 16 bits in
+	 the fxsave area.  Give those a special treatment.  */
+      if (i >= FIRST_FPU_CTRL_REGNUM && i < XMM0_REGNUM
+	  && i != FCOFF_REGNUM && i != FDOFF_REGNUM)
+	{
+	  unsigned long val = *(unsigned short *) (FXSAVE_ADDR (fxsave, i));
+
+	  if (i == FOP_REGNUM)
+	    {
+	      val &= ((1 << 11) - 1);
+	      supply_register (i, (char *) &val);
+	    }
+	  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;
+	      unsigned long fstat;
+	      int fpreg;
+	      int top;
+
+	      fstat = *(unsigned short *) (FXSAVE_ADDR (fxsave, FSTAT_REGNUM));
+	      top = ((fstat >> 11) & 0x111);
+
+	      for (fpreg = 7; fpreg >= 0; fpreg--)
+		{
+		  int tag = 0x11;
+
+		  if (val & (1 << fpreg))
+		    {
+		      int regnum = (fpreg + 8 - top) % 8 + FP0_REGNUM;
+		      tag = i387_tag (FXSAVE_ADDR (fxsave, regnum));
+		    }
+
+		  ftag |= tag << (2 * fpreg);
+		}
+	      supply_register (i, (char *) &ftag);
+	    }
+	  else
+	    supply_register (i, (char *) &val);
+	}
+      else
+	supply_register (i, FXSAVE_ADDR (fxsave, i));
+    }
+}
+
+/* Fill register REGNO (if it is a floating-point or SSE register) in
+   *FXSAVE with the value in GDB's register array.  If REGNO 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 regno)
+{
+  int i;
+
+  for (i = FP0_REGNUM; i <= MXCSR_REGNUM; i++)
+    if (regno == -1 || regno == i)
+      {
+	/* Most of the FPU control registers occupy only 16 bits in
+           the fxsave area.  Give those a special treatment.  */
+	if (i >= FIRST_FPU_CTRL_REGNUM && i < XMM0_REGNUM
+	    && i != FCOFF_REGNUM && i != FDOFF_REGNUM)
+	  {
+	    if (i == FOP_REGNUM)
+	      {
+		unsigned short oldval, newval;
+
+		/* The opcode occupies only 11 bits.  */
+		oldval = (*(unsigned short *) (FXSAVE_ADDR (fxsave, i)));
+		newval = *(unsigned short *) &registers[REGISTER_BYTE (i)];
+		newval &= ((1 << 11) - 1);
+		newval |= oldval & ~((1 << 11) - 1);
+		memcpy (FXSAVE_ADDR (fxsave, i), &newval, 2);
+	      }
+	    else if (i == FTAG_REGNUM)
+	      {
+		/* Converting back is much easier.  */
+
+		unsigned char val = 0;
+		unsigned short ftag;
+		int fpreg;
+
+		ftag = *(unsigned short *) &registers[REGISTER_BYTE (i)];
+
+		for (fpreg = 7; fpreg >= 0; fpreg--)
+		  {
+		    int tag = (ftag >> (fpreg * 2)) & 0x11;
+
+		    if (tag != 0x11)
+		      val |= (1 << fpreg);
+		  }
+
+		memcpy (FXSAVE_ADDR (fxsave, i), &val, 2);
+	      }
+	    else
+	      memcpy (FXSAVE_ADDR (fxsave, i),
+		      &registers[REGISTER_BYTE (i)], 2);
+	  }
+	else
+	  memcpy (FXSAVE_ADDR (fxsave, i), &registers[REGISTER_BYTE (i)],
+		  REGISTER_RAW_SIZE (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 (0x10);
+    }
+  else if (exponent == 0x0000)
+    {
+      if (integer)
+	{
+	  /* Valid.  */
+	  return (0x00);
+	}
+      else
+	{
+	  /* Special.  */
+	  return (0x10);
+	}
+    }
+  else
+    {
+      if (fraction[0] == 0x0000 && fraction[1] == 0x0000 && !integer)
+	{
+	  /* Zero.  */
+	  return (0x01);
+	}
+      else
+	{
+	  /* Special.  */
+	  return (0x10);
+	}
+    }
+}