/* 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, 2009 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 "floatformat.h"
#include "frame.h"
+#include "gdbcore.h"
#include "inferior.h"
#include "language.h"
-#include "value.h"
-#include "gdbcore.h"
-#include "floatformat.h"
#include "regcache.h"
+#include "value.h"
+
#include "gdb_assert.h"
#include "gdb_string.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 (struct gdbarch *gdbarch,
+ const gdb_byte *raw, struct ui_file *file)
{
DOUBLEST value;
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);
+ value = extract_typed_floating (raw, i387_ext_type (gdbarch));
/* 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
}
/* Print the classification for the register contents RAW. */
+
static void
-print_i387_ext (unsigned char *raw, struct ui_file *file)
+print_i387_ext (struct gdbarch *gdbarch,
+ const gdb_byte *raw, struct ui_file *file)
{
int sign;
int integer;
}
else if (exponent < 0x7fff && exponent > 0x0000 && integer)
/* Normal. */
- print_i387_value (raw, file);
+ print_i387_value (gdbarch, raw, file);
else if (exponent == 0x0000)
{
/* Denormal or zero. */
- print_i387_value (raw, file);
+ print_i387_value (gdbarch, raw, file);
if (integer)
/* Pseudo-denormal. */
}
/* 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"));
+ hex_string_custom (status, 4));
fputs_filtered (" ", file);
fprintf_filtered (file, " %s", (status & 0x0001) ? "IE" : " ");
fprintf_filtered (file, " %s", (status & 0x0002) ? "DE" : " ");
}
/* 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"));
+ hex_string_custom (control, 4));
fputs_filtered (" ", file);
fprintf_filtered (file, " %s", (control & 0x0001) ? "IM" : " ");
fprintf_filtered (file, " %s", (control & 0x0002) ? "DM" : " ");
i387_print_float_info (struct gdbarch *gdbarch, struct ui_file *file,
struct frame_info *frame, const char *args)
{
- char buf[4];
+ struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (frame));
+ gdb_byte buf[4];
ULONGEST fctrl;
ULONGEST fstat;
ULONGEST ftag;
int fpreg;
int top;
- frame_register_read (frame, FCTRL_REGNUM, buf);
- fctrl = extract_unsigned_integer (buf, 4);
- frame_register_read (frame, FSTAT_REGNUM, buf);
- fstat = extract_unsigned_integer (buf, 4);
- frame_register_read (frame, FTAG_REGNUM, buf);
- ftag = extract_unsigned_integer (buf, 4);
- frame_register_read (frame, FISEG_REGNUM, buf);
- fiseg = extract_unsigned_integer (buf, 4);
- frame_register_read (frame, FIOFF_REGNUM, buf);
- fioff = extract_unsigned_integer (buf, 4);
- frame_register_read (frame, FOSEG_REGNUM, buf);
- foseg = extract_unsigned_integer (buf, 4);
- frame_register_read (frame, FOOFF_REGNUM, buf);
- fooff = extract_unsigned_integer (buf, 4);
- frame_register_read (frame, FOP_REGNUM, buf);
- fop = extract_unsigned_integer (buf, 4);
+ gdb_assert (gdbarch == get_frame_arch (frame));
+
+ fctrl = get_frame_register_unsigned (frame, I387_FCTRL_REGNUM (tdep));
+ fstat = get_frame_register_unsigned (frame, I387_FSTAT_REGNUM (tdep));
+ ftag = get_frame_register_unsigned (frame, I387_FTAG_REGNUM (tdep));
+ fiseg = get_frame_register_unsigned (frame, I387_FISEG_REGNUM (tdep));
+ fioff = get_frame_register_unsigned (frame, I387_FIOFF_REGNUM (tdep));
+ foseg = get_frame_register_unsigned (frame, I387_FOSEG_REGNUM (tdep));
+ fooff = get_frame_register_unsigned (frame, I387_FOOFF_REGNUM (tdep));
+ fop = get_frame_register_unsigned (frame, I387_FOP_REGNUM (tdep));
top = ((fstat >> 11) & 7);
for (fpreg = 7; fpreg >= 0; fpreg--)
{
- unsigned char raw[FPU_REG_RAW_SIZE];
+ gdb_byte raw[I386_MAX_REGISTER_SIZE];
int tag = (ftag >> (fpreg * 2)) & 3;
int i;
break;
}
- frame_register_read (frame, (fpreg + 8 - top) % 8 + FP0_REGNUM, raw);
+ get_frame_register (frame, (fpreg + 8 - top) % 8 + I387_ST0_REGNUM (tdep),
+ 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);
+ print_i387_ext (gdbarch, raw, file);
fputs_filtered ("\n", file);
}
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));
}
\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 (gdbarch, regnum))
+ {
+ /* Floating point registers must be converted unless we are
+ accessing them in their hardware type. */
+ if (type == i387_ext_type (gdbarch))
+ 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];
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ gdb_byte from[I386_MAX_REGISTER_SIZE];
- gdb_assert (i386_fp_regnum_p (regnum));
+ gdb_assert (i386_fp_regnum_p (gdbarch, 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. */
- frame_read_register (frame, regnum, from);
- convert_typed_floating (from, builtin_type_i387_ext, to, type);
+ /* Convert to TYPE. */
+ get_frame_register (frame, regnum, from);
+ convert_typed_floating (from, i387_ext_type (gdbarch), to, type);
}
/* Write the contents FROM of a value of type TYPE into register
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];
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ gdb_byte to[I386_MAX_REGISTER_SIZE];
- gdb_assert (i386_fp_regnum_p (regnum));
+ gdb_assert (i386_fp_regnum_p (gdbarch, 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_typed_floating (from, type, to, builtin_type_i387_ext);
+ /* Convert from TYPE. */
+ convert_typed_floating (from, type, to, i387_ext_type (gdbarch));
put_frame_register (frame, regnum, to);
}
\f
-/* 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. */
+/* Handle FSAVE and FXSAVE formats. */
/* At fsave_offset[REGNUM] you'll find the offset to the location in
the data structure used by the "fsave" instruction where GDB
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). */
+ 28 + 0 * 10, /* %st(0) ... */
+ 28 + 1 * 10,
+ 28 + 2 * 10,
+ 28 + 3 * 10,
+ 28 + 4 * 10,
+ 28 + 5 * 10,
+ 28 + 6 * 10,
+ 28 + 7 * 10, /* ... %st(7). */
+ 0, /* `fctrl' (16 bits). */
+ 4, /* `fstat' (16 bits). */
+ 8, /* `ftag' (16 bits). */
+ 16, /* `fiseg' (16 bits). */
+ 12, /* `fioff'. */
+ 24, /* `foseg' (16 bits). */
+ 20, /* `fooff'. */
+ 18 /* `fop' (bottom 11 bits). */
};
-#define FSAVE_ADDR(fsave, regnum) (fsave + fsave_offset[regnum - FP0_REGNUM])
+#define FSAVE_ADDR(tdep, fsave, regnum) \
+ (fsave + fsave_offset[regnum - I387_ST0_REGNUM (tdep)])
\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. */
+/* Fill register REGNUM in REGCACHE 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)
+i387_supply_fsave (struct regcache *regcache, int regnum, const void *fsave)
{
- if (fsave == NULL)
- {
- supply_register (regnum, NULL);
- return;
- }
+ struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
+ const gdb_byte *regs = fsave;
+ int i;
- /* 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];
+ gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM);
- 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));
-}
+ for (i = I387_ST0_REGNUM (tdep); i < I387_XMM0_REGNUM (tdep); i++)
+ if (regnum == -1 || regnum == i)
+ {
+ if (fsave == NULL)
+ {
+ regcache_raw_supply (regcache, i, NULL);
+ continue;
+ }
-/* Fill GDB's register array with the floating-point register values
- in *FSAVE. This function masks off any of the reserved
- bits in *FSAVE. */
+ /* Most of the FPU control registers occupy only 16 bits in the
+ fsave area. Give those a special treatment. */
+ if (i >= I387_FCTRL_REGNUM (tdep)
+ && i != I387_FIOFF_REGNUM (tdep) && i != I387_FOOFF_REGNUM (tdep))
+ {
+ gdb_byte val[4];
-void
-i387_supply_fsave (char *fsave)
-{
- int i;
+ memcpy (val, FSAVE_ADDR (tdep, regs, i), 2);
+ val[2] = val[3] = 0;
+ if (i == I387_FOP_REGNUM (tdep))
+ val[1] &= ((1 << 3) - 1);
+ regcache_raw_supply (regcache, i, val);
+ }
+ else
+ regcache_raw_supply (regcache, i, FSAVE_ADDR (tdep, regs, i));
+ }
+
+ /* Provide dummy values for the SSE registers. */
+ for (i = I387_XMM0_REGNUM (tdep); i < I387_MXCSR_REGNUM (tdep); i++)
+ if (regnum == -1 || regnum == i)
+ regcache_raw_supply (regcache, i, NULL);
+ if (regnum == -1 || regnum == I387_MXCSR_REGNUM (tdep))
+ {
+ gdb_byte buf[4];
- for (i = FP0_REGNUM; i < XMM0_REGNUM; i++)
- i387_supply_register (i, fsave);
+ store_unsigned_integer (buf, 4, 0x1f80);
+ regcache_raw_supply (regcache, I387_MXCSR_REGNUM (tdep), buf);
+ }
}
/* 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. */
+ 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 (char *fsave, int regnum)
+i387_collect_fsave (const struct regcache *regcache, int regnum, void *fsave)
{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
+ gdb_byte *regs = fsave;
int i;
- for (i = FP0_REGNUM; i < XMM0_REGNUM; i++)
+ gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM);
+
+ for (i = I387_ST0_REGNUM (tdep); i < I387_XMM0_REGNUM (tdep); 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)
+ if (i >= I387_FCTRL_REGNUM (tdep)
+ && i != I387_FIOFF_REGNUM (tdep) && i != I387_FOOFF_REGNUM (tdep))
{
- unsigned char buf[4];
+ gdb_byte buf[4];
- regcache_collect (i, buf);
+ regcache_raw_collect (regcache, i, buf);
- if (i == FOP_REGNUM)
+ if (i == I387_FOP_REGNUM (tdep))
{
/* 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));
+ buf[1] |= ((FSAVE_ADDR (tdep, regs, i))[1] & ~((1 << 3) - 1));
}
- memcpy (FSAVE_ADDR (fsave, i), buf, 2);
+ memcpy (FSAVE_ADDR (tdep, regs, i), buf, 2);
}
else
- regcache_collect (i, FSAVE_ADDR (fsave, i));
+ regcache_raw_collect (regcache, i, FSAVE_ADDR (tdep, regs, i));
}
}
\f
static int fxsave_offset[] =
{
- 32, /* FP0_REGNUM through ... */
+ 32, /* %st(0) 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 + 0 * 16, /* XMM0_REGNUM through ... */
+ 144, /* ... %st(7) (80 bits each). */
+ 0, /* `fctrl' (16 bits). */
+ 2, /* `fstat' (16 bits). */
+ 4, /* `ftag' (16 bits). */
+ 12, /* `fiseg' (16 bits). */
+ 8, /* `fioff'. */
+ 20, /* `foseg' (16 bits). */
+ 16, /* `fooff'. */
+ 6, /* `fop' (bottom 11 bits). */
+ 160 + 0 * 16, /* %xmm0 through ... */
160 + 1 * 16,
160 + 2 * 16,
160 + 3 * 16,
160 + 12 * 16,
160 + 13 * 16,
160 + 14 * 16,
- 160 + 15 * 16, /* ... XMM15_REGNUM (128 bits each). */
- 24 /* MXCSR_REGNUM. */
+ 160 + 15 * 16, /* ... %xmm15 (128 bits each). */
};
-/* FIXME: kettenis/20030430: We made an unfortunate choice in putting
- %mxcsr after the SSE registers %xmm0-%xmm7 instead of before, since
- it makes supporting the registers %xmm8-%xmm15 on x86-64 a bit
- involved. Hack around it by explicitly overriding the offset for
- %mxcsr here. */
+#define FXSAVE_ADDR(tdep, fxsave, regnum) \
+ (fxsave + fxsave_offset[regnum - I387_ST0_REGNUM (tdep)])
-#define FXSAVE_ADDR(fxsave, regnum) \
- ((regnum == MXCSR_REGNUM) ? (fxsave + 24) : \
- (fxsave + fxsave_offset[regnum - FP0_REGNUM]))
+/* We made an unfortunate choice in putting %mxcsr after the SSE
+ registers %xmm0-%xmm7 instead of before, since it makes supporting
+ the registers %xmm8-%xmm15 on AMD64 a bit involved. Therefore we
+ don't include the offset for %mxcsr here above. */
-static int i387_tag (unsigned char *raw);
+#define FXSAVE_MXCSR_ADDR(fxsave) (fxsave + 24)
+
+static int i387_tag (const gdb_byte *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. */
+/* Fill register REGNUM in REGCACHE with the appropriate
+ floating-point or SSE register value from *FXSAVE. This function
+ masks off any of the reserved bits in *FXSAVE. */
void
-i387_supply_fxsave (char *fxsave)
+i387_supply_fxsave (struct regcache *regcache, int regnum, const void *fxsave)
{
- int i, last_regnum = MXCSR_REGNUM;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
+ const gdb_byte *regs = fxsave;
+ int i;
- if (gdbarch_tdep (current_gdbarch)->num_xmm_regs == 0)
- last_regnum = FOP_REGNUM;
+ gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM);
+ gdb_assert (tdep->num_xmm_regs > 0);
- for (i = FP0_REGNUM; i <= last_regnum; i++)
- {
- if (fxsave == NULL)
- {
- supply_register (i, NULL);
- continue;
- }
+ for (i = I387_ST0_REGNUM (tdep); i < I387_MXCSR_REGNUM (tdep); i++)
+ if (regnum == -1 || regnum == i)
+ {
+ if (regs == NULL)
+ {
+ regcache_raw_supply (regcache, i, NULL);
+ continue;
+ }
- /* 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);
- }
+ /* Most of the FPU control registers occupy only 16 bits in
+ the fxsave area. Give those a special treatment. */
+ if (i >= I387_FCTRL_REGNUM (tdep) && i < I387_XMM0_REGNUM (tdep)
+ && i != I387_FIOFF_REGNUM (tdep) && i != I387_FOOFF_REGNUM (tdep))
+ {
+ gdb_byte val[4];
+
+ memcpy (val, FXSAVE_ADDR (tdep, regs, i), 2);
+ val[2] = val[3] = 0;
+ if (i == I387_FOP_REGNUM (tdep))
+ val[1] &= ((1 << 3) - 1);
+ else if (i== I387_FTAG_REGNUM (tdep))
+ {
+ /* 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 (tdep, regs,
+ I387_FSTAT_REGNUM (tdep)))[1] >> 3);
+ top &= 0x7;
+
+ for (fpreg = 7; fpreg >= 0; fpreg--)
+ {
+ int tag;
+
+ if (val[0] & (1 << fpreg))
+ {
+ int regnum = (fpreg + 8 - top) % 8
+ + I387_ST0_REGNUM (tdep);
+ tag = i387_tag (FXSAVE_ADDR (tdep, regs, regnum));
+ }
+ else
+ tag = 3; /* Empty */
+
+ ftag |= tag << (2 * fpreg);
+ }
+ val[0] = ftag & 0xff;
+ val[1] = (ftag >> 8) & 0xff;
+ }
+ regcache_raw_supply (regcache, i, val);
+ }
+ else
+ regcache_raw_supply (regcache, i, FXSAVE_ADDR (tdep, regs, i));
+ }
+
+ if (regnum == I387_MXCSR_REGNUM (tdep) || regnum == -1)
+ {
+ if (regs == NULL)
+ regcache_raw_supply (regcache, I387_MXCSR_REGNUM (tdep), NULL);
else
- supply_register (i, FXSAVE_ADDR (fxsave, i));
+ regcache_raw_supply (regcache, I387_MXCSR_REGNUM (tdep),
+ FXSAVE_MXCSR_ADDR (regs));
}
}
/* 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. */
+ *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 (char *fxsave, int regnum)
+i387_collect_fxsave (const struct regcache *regcache, int regnum, void *fxsave)
{
- int i, last_regnum = MXCSR_REGNUM;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
+ gdb_byte *regs = fxsave;
+ int i;
- if (gdbarch_tdep (current_gdbarch)->num_xmm_regs == 0)
- last_regnum = FOP_REGNUM;
+ gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM);
+ gdb_assert (tdep->num_xmm_regs > 0);
- for (i = FP0_REGNUM; i <= last_regnum; i++)
+ for (i = I387_ST0_REGNUM (tdep); i < I387_MXCSR_REGNUM (tdep); 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 != FOOFF_REGNUM)
+ if (i >= I387_FCTRL_REGNUM (tdep) && i < I387_XMM0_REGNUM (tdep)
+ && i != I387_FIOFF_REGNUM (tdep) && i != I387_FOOFF_REGNUM (tdep))
{
- unsigned char buf[4];
+ gdb_byte buf[4];
- regcache_collect (i, buf);
+ regcache_raw_collect (regcache, i, buf);
- if (i == FOP_REGNUM)
+ if (i == I387_FOP_REGNUM (tdep))
{
/* 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));
+ buf[1] |= ((FXSAVE_ADDR (tdep, regs, i))[1] & ~((1 << 3) - 1));
}
- else if (i == FTAG_REGNUM)
+ else if (i == I387_FTAG_REGNUM (tdep))
{
/* Converting back is much easier. */
buf[0] |= (1 << fpreg);
}
}
- memcpy (FXSAVE_ADDR (fxsave, i), buf, 2);
+ memcpy (FXSAVE_ADDR (tdep, regs, i), buf, 2);
}
else
- regcache_collect (i, FXSAVE_ADDR (fxsave, i));
+ regcache_raw_collect (regcache, i, FXSAVE_ADDR (tdep, regs, i));
}
+
+ if (regnum == I387_MXCSR_REGNUM (tdep) || regnum == -1)
+ regcache_raw_collect (regcache, I387_MXCSR_REGNUM (tdep),
+ FXSAVE_MXCSR_ADDR (regs));
}
/* Recreate the FTW (tag word) valid bits from the 80-bit FP data in
*RAW. */
static int
-i387_tag (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;
+
+ /* 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 (tdep), &fstat);
+ fstat |= (7 << 11);
+ regcache_raw_write_unsigned (regcache, I387_FSTAT_REGNUM (tdep), 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 (tdep), 0x3fff);
+
+}
projects / deliverable / binutils-gdb.git / blobdiff