/* Intel 387 floating point stuff.
- Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1998, 1999, 2000,
- 2001, 2002, 2003 Free Software Foundation, Inc.
+ Copyright (C) 1988, 1989, 1991, 1992, 1993, 1994, 1998, 1999, 2000, 2001,
+ 2002, 2003, 2004, 2005, 2007, 2008 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
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
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. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "doublest.h"
#include "i386-tdep.h"
#include "i387-tdep.h"
-/* 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)
+print_i387_value (const gdb_byte *raw, struct ui_file *file)
{
DOUBLEST value;
/* Print the classification for the register contents RAW. */
static void
-print_i387_ext (unsigned char *raw, struct ui_file *file)
+print_i387_ext (const gdb_byte *raw, struct ui_file *file)
{
int sign;
int integer;
print_i387_status_word (unsigned int status, struct ui_file *file)
{
fprintf_filtered (file, "Status Word: %s",
- local_hex_string_custom (status, "04"));
+ hex_string_custom (status, 4));
fputs_filtered (" ", file);
fprintf_filtered (file, " %s", (status & 0x0001) ? "IE" : " ");
fprintf_filtered (file, " %s", (status & 0x0002) ? "DE" : " ");
print_i387_control_word (unsigned int control, struct ui_file *file)
{
fprintf_filtered (file, "Control Word: %s",
- local_hex_string_custom (control, "04"));
+ hex_string_custom (control, 4));
fputs_filtered (" ", file);
fprintf_filtered (file, " %s", (control & 0x0001) ? "IM" : " ");
fprintf_filtered (file, " %s", (control & 0x0002) ? "DM" : " ");
struct frame_info *frame, const char *args)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (frame));
- char buf[4];
+ gdb_byte buf[4];
ULONGEST fctrl;
ULONGEST fstat;
ULONGEST ftag;
for (fpreg = 7; fpreg >= 0; fpreg--)
{
- unsigned char raw[I386_MAX_REGISTER_SIZE];
+ gdb_byte raw[I386_MAX_REGISTER_SIZE];
int tag = (ftag >> (fpreg * 2)) & 3;
int i;
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"));
+ hex_string_custom (ftag, 4));
fprintf_filtered (file, "Instruction Pointer: %s:",
- local_hex_string_custom (fiseg, "02"));
- fprintf_filtered (file, "%s\n", local_hex_string_custom (fioff, "08"));
+ hex_string_custom (fiseg, 2));
+ fprintf_filtered (file, "%s\n", hex_string_custom (fioff, 8));
fprintf_filtered (file, "Operand Pointer: %s:",
- local_hex_string_custom (foseg, "02"));
- fprintf_filtered (file, "%s\n", local_hex_string_custom (fooff, "08"));
+ hex_string_custom (foseg, 2));
+ fprintf_filtered (file, "%s\n", hex_string_custom (fooff, 8));
fprintf_filtered (file, "Opcode: %s\n",
- local_hex_string_custom (fop ? (fop | 0xd800) : 0, "04"));
+ hex_string_custom (fop ? (fop | 0xd800) : 0, 4));
#undef I387_ST0_REGNUM
}
\f
+/* Return nonzero if a value of type TYPE stored in register REGNUM
+ needs any special handling. */
+
+int
+i387_convert_register_p (struct gdbarch *gdbarch, int regnum, struct type *type)
+{
+ if (i386_fp_regnum_p (regnum))
+ {
+ /* Floating point registers must be converted unless we are
+ accessing them in their hardware type. */
+ if (type == builtin_type_i387_ext)
+ return 0;
+ else
+ return 1;
+ }
+
+ return 0;
+}
+
/* Read a value of type TYPE from register REGNUM in frame FRAME, and
return its contents in TO. */
void
i387_register_to_value (struct frame_info *frame, int regnum,
- struct type *type, void *to)
+ struct type *type, gdb_byte *to)
{
- char from[I386_MAX_REGISTER_SIZE];
+ gdb_byte from[I386_MAX_REGISTER_SIZE];
gdb_assert (i386_fp_regnum_p (regnum));
/* We only support floating-point values. */
if (TYPE_CODE (type) != TYPE_CODE_FLT)
{
- warning ("Cannot convert floating-point register value "
- "to non-floating-point type.");
+ warning (_("Cannot convert floating-point register value "
+ "to non-floating-point type."));
return;
}
- /* Convert to TYPE. This should be a no-op if TYPE is equivalent to
- the extended floating-point format used by the FPU. */
+ /* Convert to TYPE. */
get_frame_register (frame, regnum, from);
convert_typed_floating (from, builtin_type_i387_ext, to, type);
}
void
i387_value_to_register (struct frame_info *frame, int regnum,
- struct type *type, const void *from)
+ struct type *type, const gdb_byte *from)
{
- char to[I386_MAX_REGISTER_SIZE];
+ gdb_byte to[I386_MAX_REGISTER_SIZE];
gdb_assert (i386_fp_regnum_p (regnum));
/* We only support floating-point values. */
if (TYPE_CODE (type) != TYPE_CODE_FLT)
{
- warning ("Cannot convert non-floating-point type "
- "to floating-point register value.");
+ warning (_("Cannot convert non-floating-point type "
+ "to floating-point register value."));
return;
}
- /* Convert from TYPE. This should be a no-op if TYPE is equivalent
- to the extended floating-point format used by the FPU. */
+ /* Convert from TYPE. */
convert_typed_floating (from, type, to, builtin_type_i387_ext);
put_frame_register (frame, regnum, to);
}
\f
-\f
/* Handle FSAVE and FXSAVE formats. */
-/* FIXME: kettenis/20030927: The functions below should accept a
- `regcache' argument, but I don't want to change the function
- signature just yet. There's some band-aid in the functions below
- in the form of the `regcache' local variables. This will ease the
- transition later on. */
-
/* 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. */
i387_supply_fsave (struct regcache *regcache, int regnum, const void *fsave)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
- const char *regs = fsave;
+ const gdb_byte *regs = fsave;
int i;
gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM);
- /* Define I387_ST0_REGNUM such that we use the proper definitions
- for REGCACHE's architecture. */
+ /* Define I387_ST0_REGNUM and I387_NUM_XMM_REGS such that we use the
+ proper definitions for REGCACHE's architecture. */
+
#define I387_ST0_REGNUM tdep->st0_regnum
+#define I387_NUM_XMM_REGS tdep->num_xmm_regs
for (i = I387_ST0_REGNUM; i < I387_XMM0_REGNUM; i++)
if (regnum == -1 || regnum == i)
if (i >= I387_FCTRL_REGNUM
&& i != I387_FIOFF_REGNUM && i != I387_FOOFF_REGNUM)
{
- unsigned char val[4];
+ gdb_byte val[4];
memcpy (val, FSAVE_ADDR (regs, i), 2);
val[2] = val[3] = 0;
else
regcache_raw_supply (regcache, i, FSAVE_ADDR (regs, i));
}
+
+ /* Provide dummy values for the SSE registers. */
+ for (i = I387_XMM0_REGNUM; i < I387_MXCSR_REGNUM; i++)
+ if (regnum == -1 || regnum == i)
+ regcache_raw_supply (regcache, i, NULL);
+ if (regnum == -1 || regnum == I387_MXCSR_REGNUM)
+ {
+ gdb_byte buf[4];
+
+ store_unsigned_integer (buf, 4, 0x1f80);
+ regcache_raw_supply (regcache, I387_MXCSR_REGNUM, buf);
+ }
+
#undef I387_ST0_REGNUM
+#undef I387_NUM_XMM_REGS
}
/* Fill register REGNUM (if it is a floating-point register) in *FSAVE
- with the value in GDB's register cache. If REGNUM is -1, do this
- for all registers. This function doesn't touch any of the reserved
- bits in *FSAVE. */
+ with the value from REGCACHE. 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 (void *fsave, int regnum)
+i387_collect_fsave (const struct regcache *regcache, int regnum, void *fsave)
{
- struct regcache *regcache = current_regcache;
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
- char *regs = fsave;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
+ gdb_byte *regs = fsave;
int i;
gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM);
if (i >= I387_FCTRL_REGNUM
&& i != I387_FIOFF_REGNUM && i != I387_FOOFF_REGNUM)
{
- unsigned char buf[4];
+ gdb_byte buf[4];
regcache_raw_collect (regcache, i, buf);
#define FXSAVE_MXCSR_ADDR(fxsave) (fxsave + 24)
-static int i387_tag (const unsigned char *raw);
+static int i387_tag (const gdb_byte *raw);
\f
/* Fill register REGNUM in REGCACHE with the appropriate
i387_supply_fxsave (struct regcache *regcache, int regnum, const void *fxsave)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
- const char *regs = fxsave;
+ const gdb_byte *regs = fxsave;
int i;
gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM);
if (i >= I387_FCTRL_REGNUM && i < I387_XMM0_REGNUM
&& i != I387_FIOFF_REGNUM && i != I387_FOOFF_REGNUM)
{
- unsigned char val[4];
+ gdb_byte val[4];
memcpy (val, FXSAVE_ADDR (regs, i), 2);
val[2] = val[3] = 0;
}
/* Fill register REGNUM (if it is a floating-point or SSE register) in
- *FXSAVE with the value in GDB's register cache. If REGNUM is -1, do
- this for all registers. This function doesn't touch any of the
- reserved bits in *FXSAVE. */
+ *FXSAVE with the value from REGCACHE. 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 (void *fxsave, int regnum)
+i387_collect_fxsave (const struct regcache *regcache, int regnum, void *fxsave)
{
- struct regcache *regcache = current_regcache;
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
- char *regs = fxsave;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
+ gdb_byte *regs = fxsave;
int i;
gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM);
if (i >= I387_FCTRL_REGNUM && i < I387_XMM0_REGNUM
&& i != I387_FIOFF_REGNUM && i != I387_FOOFF_REGNUM)
{
- unsigned char buf[4];
+ gdb_byte buf[4];
regcache_raw_collect (regcache, i, buf);
*RAW. */
static int
-i387_tag (const unsigned char *raw)
+i387_tag (const gdb_byte *raw)
{
int integer;
unsigned int exponent;
}
}
}
+
+/* Prepare the FPU stack in REGCACHE for a function return. */
+
+void
+i387_return_value (struct gdbarch *gdbarch, struct regcache *regcache)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ ULONGEST fstat;
+
+ /* Define I387_ST0_REGNUM such that we use the proper
+ definitions for the architecture. */
+#define I387_ST0_REGNUM tdep->st0_regnum
+
+ /* Set the top of the floating-point register stack to 7. The
+ actual value doesn't really matter, but 7 is what a normal
+ function return would end up with if the program started out with
+ a freshly initialized FPU. */
+ regcache_raw_read_unsigned (regcache, I387_FSTAT_REGNUM, &fstat);
+ fstat |= (7 << 11);
+ regcache_raw_write_unsigned (regcache, I387_FSTAT_REGNUM, fstat);
+
+ /* Mark %st(1) through %st(7) as empty. Since we set the top of the
+ floating-point register stack to 7, the appropriate value for the
+ tag word is 0x3fff. */
+ regcache_raw_write_unsigned (regcache, I387_FTAG_REGNUM, 0x3fff);
+
+#undef I387_ST0_REGNUM
+}
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