[PATCH] New i387 native files.
Mark Kettenis
kettenis@wins.uva.nl
Tue May 23 16:53:00 GMT 2000
When I found myself writing yet another way of moving data from an
i387 FSAVE area to GDB's register array for FreeBSD/i386 I decided
that it would be useful to have a generic pair of functions to do
this. Hence the birth of two new files. The FreeBSD/i386 port will
use this, and it is my intention to convert the other i386 native
configurations to use them too.
Mark
2000-05-24 Mark Kettenis <kettenis@gnu.org>
* i387-nat.h, i387-nat.c: New files.
--- /dev/null Thu Feb 19 16:30:24 1998
+++ i387-nat.h Wed May 24 01:35:31 2000
@@ -0,0 +1,37 @@
+/* Native-dependent code for the i387.
+ Copyright (C) 2000 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. */
+
+#ifndef I387_NAT_H
+#define I387_NAT_H
+
+/* 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);
+
+/* Fill register REGNO (if it is a floating-point register) in *FSAVE
+ 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 *FSAVE. */
+
+void i387_fill_fsave (char *fsave, int regno);
+
+#endif /* i387-nat.h */
--- /dev/null Thu Feb 19 16:30:24 1998
+++ i387-nat.c Mon May 22 02:23:55 2000
@@ -0,0 +1,125 @@
+/* Native-dependent code for the i387.
+ Copyright (C) 2000 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 "inferior.h"
+#include "value.h"
+
+/* 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[REGNO] you'll find the offset to the location in
+ the data structure used by the "fsave" instruction where GDB
+ register REGNO 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, /* FCS_REGNUM (16 bits). */
+ 12, /* FCOFF_REGNUM. */
+ 24, /* FDS_REGNUM. */
+ 20, /* FDOFF_REGNUM. */
+ 18 /* FOP_REGNUM (bottom 11 bits). */
+};
+
+#define FSAVE_ADDR(fsave, regnum) (fsave + fsave_offset[regnum - FP0_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 <= LAST_FPU_CTRL_REGNUM; i++)
+ {
+ /* Most of the FPU control registers occupy only 16 bits in
+ the fsave area. Give those a special treatment. */
+ if (i >= FIRST_FPU_CTRL_REGNUM
+ && i != FCOFF_REGNUM && i != FDOFF_REGNUM)
+ {
+ unsigned val = *(unsigned short *) (FSAVE_ADDR (fsave, i));
+
+ if (i == FOP_REGNUM)
+ {
+ val &= ((1 << 11) - 1);
+ supply_register (i, (char *) &val);
+ }
+ else
+ supply_register (i, (char *) &val);
+ }
+ else
+ supply_register (i, FSAVE_ADDR (fsave, i));
+ }
+}
+
+/* Fill register REGNO (if it is a floating-point register) in *FSAVE
+ 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 *FSAVE. */
+
+void
+i387_fill_fsave (char *fsave, int regno)
+{
+ int i;
+
+ for (i = FP0_REGNUM; i <= LAST_FPU_CTRL_REGNUM; i++)
+ if (regno == -1 || regno == i)
+ {
+ /* Most of the FPU control registers occupy only 16 bits in
+ the fsave area. Give those a special treatment. */
+ if (i >= FIRST_FPU_CTRL_REGNUM
+ && i != FCOFF_REGNUM && i != FDOFF_REGNUM)
+ {
+ if (i == FOP_REGNUM)
+ {
+ unsigned short oldval, newval;
+
+ /* The opcode occupies only 11 bits. */
+ oldval = (*(unsigned short *) (FSAVE_ADDR (fsave, i)));
+ newval = *(unsigned short *) ®isters[REGISTER_BYTE (i)];
+ newval &= ((1 << 11) - 1);
+ newval |= oldval & ~((1 << 11) - 1);
+ memcpy (FSAVE_ADDR (fsave, i), &newval, 2);
+ }
+ else
+ memcpy (FSAVE_ADDR (fsave, i), ®isters[REGISTER_BYTE (i)], 2);
+ }
+ else
+ memcpy (FSAVE_ADDR (fsave, i), ®isters[REGISTER_BYTE (i)],
+ REGISTER_RAW_SIZE (i));
+ }
+}
More information about the Gdb-patches
mailing list