/* Intel 387 floating point stuff.
- Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1998, 1999, 2000, 2001
- Free Software Foundation, Inc.
+
+ Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1998, 1999, 2000,
+ 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of GDB.
Boston, MA 02111-1307, USA. */
#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 "gdb_assert.h"
-
-
-/* FIXME: Eliminate the next two functions when we have the time to
- change all the callers. */
-
-void i387_to_double (char *from, char *to);
-void double_to_i387 (char *from, char *to);
-
-void
-i387_to_double (char *from, char *to)
-{
- floatformat_to_double (&floatformat_i387_ext, from, (double *) to);
-}
-
-void
-double_to_i387 (char *from, char *to)
-{
- floatformat_from_double (&floatformat_i387_ext, (double *) from, to);
-}
-
-\f
-/* FIXME: The functions on this page are used by the old `info float'
- implementations that a few of the i386 targets provide. These
- functions should be removed if all of these have been converted to
- use the generic implementation based on the new register file
- layout. */
-
-static void print_387_control_bits (unsigned int control);
-static void print_387_status_bits (unsigned int status);
-
-static void
-print_387_control_bits (unsigned int control)
-{
- switch ((control >> 8) & 3)
- {
- case 0:
- puts_unfiltered (" 24 bit; ");
- break;
- case 1:
- puts_unfiltered (" (bad); ");
- break;
- case 2:
- puts_unfiltered (" 53 bit; ");
- break;
- case 3:
- puts_unfiltered (" 64 bit; ");
- break;
- }
- switch ((control >> 10) & 3)
- {
- case 0:
- puts_unfiltered ("NEAR; ");
- break;
- case 1:
- puts_unfiltered ("DOWN; ");
- break;
- case 2:
- puts_unfiltered ("UP; ");
- break;
- case 3:
- puts_unfiltered ("CHOP; ");
- break;
- }
- if (control & 0x3f)
- {
- puts_unfiltered ("mask");
- if (control & 0x0001)
- puts_unfiltered (" INVAL");
- if (control & 0x0002)
- puts_unfiltered (" DENOR");
- if (control & 0x0004)
- puts_unfiltered (" DIVZ");
- if (control & 0x0008)
- puts_unfiltered (" OVERF");
- if (control & 0x0010)
- puts_unfiltered (" UNDER");
- if (control & 0x0020)
- puts_unfiltered (" LOS");
- puts_unfiltered (";");
- }
-
- if (control & 0xe080)
- warning ("\nreserved bits on: %s",
- local_hex_string (control & 0xe080));
-}
-
-void
-print_387_control_word (unsigned int control)
-{
- printf_filtered ("control %s:", local_hex_string(control & 0xffff));
- print_387_control_bits (control);
- puts_unfiltered ("\n");
-}
+#include "value.h"
-static void
-print_387_status_bits (unsigned int status)
-{
- printf_unfiltered (" flags %d%d%d%d; ",
- (status & 0x4000) != 0,
- (status & 0x0400) != 0,
- (status & 0x0200) != 0,
- (status & 0x0100) != 0);
- printf_unfiltered ("top %d; ", (status >> 11) & 7);
- if (status & 0xff)
- {
- puts_unfiltered ("excep");
- if (status & 0x0001) puts_unfiltered (" INVAL");
- if (status & 0x0002) puts_unfiltered (" DENOR");
- if (status & 0x0004) puts_unfiltered (" DIVZ");
- if (status & 0x0008) puts_unfiltered (" OVERF");
- if (status & 0x0010) puts_unfiltered (" UNDER");
- if (status & 0x0020) puts_unfiltered (" LOS");
- if (status & 0x0040) puts_unfiltered (" STACK");
- }
-}
+#include "gdb_assert.h"
+#include "gdb_string.h"
-void
-print_387_status_word (unsigned int status)
-{
- printf_filtered ("status %s:", local_hex_string (status & 0xffff));
- print_387_status_bits (status);
- puts_unfiltered ("\n");
-}
+#include "i386-tdep.h"
+#include "i387-tdep.h"
-\f
/* 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)
+print_i387_value (char *raw, struct ui_file *file)
{
DOUBLEST value;
- int len = TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT;
- char *tmp = alloca (len);
-
- /* This code only works on targets where ... */
- gdb_assert (TARGET_LONG_DOUBLE_FORMAT == &floatformat_i387_ext);
-
- /* Take care of the padding. FP reg is 80 bits. The same value in
- memory is 96 bits. */
- gdb_assert (FPU_REG_RAW_SIZE < len);
- memcpy (&tmp, raw, FPU_REG_RAW_SIZE);
- memset (&tmp + FPU_REG_RAW_SIZE, 0, len - FPU_REG_RAW_SIZE);
-
- /* Extract the value as a DOUBLEST. */
- /* Use extract_floating() rather than floatformat_to_doublest().
- The latter is lossy in nature. Once GDB gets a host/target
- independent and non-lossy FP it will become possible to bypass
- extract_floating() and call floatformat*() directly. Note also
- the assumptions about TARGET_LONG_DOUBLE above. */
- value = extract_floating (tmp, len);
+
+ /* Using extract_typed_floating here might affect the representation
+ 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);
/* 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
to print the value, 1 position for the sign, 1 for the decimal
point, 19 for the digits and 6 for the exponent adds up to 27. */
#ifdef PRINTF_HAS_LONG_DOUBLE
- printf_filtered (" %-+27.19Lg", (long double) value);
+ fprintf_filtered (file, " %-+27.19Lg", (long double) value);
#else
- printf_filtered (" %-+27.19g", (double) value);
+ fprintf_filtered (file, " %-+27.19g", (double) value);
#endif
}
/* Print the classification for the register contents RAW. */
+
static void
-print_i387_ext (unsigned char *raw)
+print_i387_ext (unsigned char *raw, struct ui_file *file)
{
int sign;
int integer;
{
if (fraction[0] == 0x00000000 && fraction[1] == 0x00000000)
/* Infinity. */
- printf_filtered (" %cInf", (sign ? '-' : '+'));
+ fprintf_filtered (file, " %cInf", (sign ? '-' : '+'));
else if (sign && fraction[0] == 0x00000000 && fraction[1] == 0x40000000)
/* Real Indefinite (QNaN). */
- puts_unfiltered (" Real Indefinite (QNaN)");
+ fputs_unfiltered (" Real Indefinite (QNaN)", file);
else if (fraction[1] & 0x40000000)
/* QNaN. */
- puts_filtered (" QNaN");
+ fputs_filtered (" QNaN", file);
else
/* SNaN. */
- puts_filtered (" SNaN");
+ fputs_filtered (" SNaN", file);
}
else if (exponent < 0x7fff && exponent > 0x0000 && integer)
/* Normal. */
- print_i387_value (raw);
+ print_i387_value (raw, file);
else if (exponent == 0x0000)
{
/* Denormal or zero. */
- print_i387_value (raw);
+ print_i387_value (raw, file);
if (integer)
/* Pseudo-denormal. */
- puts_filtered (" Pseudo-denormal");
+ fputs_filtered (" Pseudo-denormal", file);
else if (fraction[0] || fraction[1])
/* Denormal. */
- puts_filtered (" Denormal");
+ fputs_filtered (" Denormal", file);
}
else
/* Unsupported. */
- puts_filtered (" Unsupported");
+ fputs_filtered (" Unsupported", file);
}
/* Print the status word STATUS. */
+
static void
-print_i387_status_word (unsigned int status)
+print_i387_status_word (unsigned int status, struct ui_file *file)
{
- printf_filtered ("Status Word: %s",
- local_hex_string_custom (status, "04"));
- puts_filtered (" ");
- printf_filtered (" %s", (status & 0x0001) ? "IE" : " ");
- printf_filtered (" %s", (status & 0x0002) ? "DE" : " ");
- printf_filtered (" %s", (status & 0x0004) ? "ZE" : " ");
- printf_filtered (" %s", (status & 0x0008) ? "OE" : " ");
- printf_filtered (" %s", (status & 0x0010) ? "UE" : " ");
- printf_filtered (" %s", (status & 0x0020) ? "PE" : " ");
- puts_filtered (" ");
- printf_filtered (" %s", (status & 0x0080) ? "ES" : " ");
- puts_filtered (" ");
- printf_filtered (" %s", (status & 0x0040) ? "SF" : " ");
- puts_filtered (" ");
- printf_filtered (" %s", (status & 0x0100) ? "C0" : " ");
- printf_filtered (" %s", (status & 0x0200) ? "C1" : " ");
- printf_filtered (" %s", (status & 0x0400) ? "C2" : " ");
- printf_filtered (" %s", (status & 0x4000) ? "C3" : " ");
-
- puts_filtered ("\n");
-
- printf_filtered (" TOP: %d\n", ((status >> 11) & 7));
+ fprintf_filtered (file, "Status Word: %s",
+ hex_string_custom (status, 4));
+ fputs_filtered (" ", file);
+ fprintf_filtered (file, " %s", (status & 0x0001) ? "IE" : " ");
+ fprintf_filtered (file, " %s", (status & 0x0002) ? "DE" : " ");
+ fprintf_filtered (file, " %s", (status & 0x0004) ? "ZE" : " ");
+ fprintf_filtered (file, " %s", (status & 0x0008) ? "OE" : " ");
+ fprintf_filtered (file, " %s", (status & 0x0010) ? "UE" : " ");
+ fprintf_filtered (file, " %s", (status & 0x0020) ? "PE" : " ");
+ fputs_filtered (" ", file);
+ fprintf_filtered (file, " %s", (status & 0x0080) ? "ES" : " ");
+ fputs_filtered (" ", file);
+ fprintf_filtered (file, " %s", (status & 0x0040) ? "SF" : " ");
+ fputs_filtered (" ", file);
+ fprintf_filtered (file, " %s", (status & 0x0100) ? "C0" : " ");
+ fprintf_filtered (file, " %s", (status & 0x0200) ? "C1" : " ");
+ fprintf_filtered (file, " %s", (status & 0x0400) ? "C2" : " ");
+ fprintf_filtered (file, " %s", (status & 0x4000) ? "C3" : " ");
+
+ fputs_filtered ("\n", file);
+
+ fprintf_filtered (file,
+ " TOP: %d\n", ((status >> 11) & 7));
}
/* Print the control word CONTROL. */
+
static void
-print_i387_control_word (unsigned int control)
+print_i387_control_word (unsigned int control, struct ui_file *file)
{
- printf_filtered ("Control Word: %s",
- local_hex_string_custom (control, "04"));
- puts_filtered (" ");
- printf_filtered (" %s", (control & 0x0001) ? "IM" : " ");
- printf_filtered (" %s", (control & 0x0002) ? "DM" : " ");
- printf_filtered (" %s", (control & 0x0004) ? "ZM" : " ");
- printf_filtered (" %s", (control & 0x0008) ? "OM" : " ");
- printf_filtered (" %s", (control & 0x0010) ? "UM" : " ");
- printf_filtered (" %s", (control & 0x0020) ? "PM" : " ");
-
- puts_filtered ("\n");
-
- puts_filtered (" PC: ");
+ fprintf_filtered (file, "Control Word: %s",
+ hex_string_custom (control, 4));
+ fputs_filtered (" ", file);
+ fprintf_filtered (file, " %s", (control & 0x0001) ? "IM" : " ");
+ fprintf_filtered (file, " %s", (control & 0x0002) ? "DM" : " ");
+ fprintf_filtered (file, " %s", (control & 0x0004) ? "ZM" : " ");
+ fprintf_filtered (file, " %s", (control & 0x0008) ? "OM" : " ");
+ fprintf_filtered (file, " %s", (control & 0x0010) ? "UM" : " ");
+ fprintf_filtered (file, " %s", (control & 0x0020) ? "PM" : " ");
+
+ fputs_filtered ("\n", file);
+
+ fputs_filtered (" PC: ", file);
switch ((control >> 8) & 3)
{
case 0:
- puts_filtered ("Single Precision (24-bits)\n");
+ fputs_filtered ("Single Precision (24-bits)\n", file);
break;
case 1:
- puts_filtered ("Reserved\n");
+ fputs_filtered ("Reserved\n", file);
break;
case 2:
- puts_filtered ("Double Precision (53-bits)\n");
+ fputs_filtered ("Double Precision (53-bits)\n", file);
break;
case 3:
- puts_filtered ("Extended Precision (64-bits)\n");
+ fputs_filtered ("Extended Precision (64-bits)\n", file);
break;
}
- puts_filtered (" RC: ");
+ fputs_filtered (" RC: ", file);
switch ((control >> 10) & 3)
{
case 0:
- puts_filtered ("Round to nearest\n");
+ fputs_filtered ("Round to nearest\n", file);
break;
case 1:
- puts_filtered ("Round down\n");
+ fputs_filtered ("Round down\n", file);
break;
case 2:
- puts_filtered ("Round up\n");
+ fputs_filtered ("Round up\n", file);
break;
case 3:
- puts_filtered ("Round toward zero\n");
+ fputs_filtered ("Round toward zero\n", file);
break;
}
}
-/* Print out the i387 floating poin state. */
+/* Print out the i387 floating point state. Note that we ignore FRAME
+ in the code below. That's OK since floating-point registers are
+ never saved on the stack. */
+
void
-i387_float_info (void)
+i387_print_float_info (struct gdbarch *gdbarch, struct ui_file *file,
+ struct frame_info *frame, const char *args)
{
- unsigned int fctrl;
- unsigned int fstat;
- unsigned int ftag;
- unsigned int fiseg;
- unsigned int fioff;
- unsigned int foseg;
- unsigned int fooff;
- unsigned int fop;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (frame));
+ char buf[4];
+ ULONGEST fctrl;
+ ULONGEST fstat;
+ ULONGEST ftag;
+ ULONGEST fiseg;
+ ULONGEST fioff;
+ ULONGEST foseg;
+ ULONGEST fooff;
+ ULONGEST 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);
-
+ gdb_assert (gdbarch == get_frame_arch (frame));
+
+ /* Define I387_ST0_REGNUM such that we use the proper definitions
+ for FRAME's architecture. */
+#define I387_ST0_REGNUM tdep->st0_regnum
+
+ fctrl = get_frame_register_unsigned (frame, I387_FCTRL_REGNUM);
+ fstat = get_frame_register_unsigned (frame, I387_FSTAT_REGNUM);
+ ftag = get_frame_register_unsigned (frame, I387_FTAG_REGNUM);
+ fiseg = get_frame_register_unsigned (frame, I387_FISEG_REGNUM);
+ fioff = get_frame_register_unsigned (frame, I387_FIOFF_REGNUM);
+ foseg = get_frame_register_unsigned (frame, I387_FOSEG_REGNUM);
+ fooff = get_frame_register_unsigned (frame, I387_FOOFF_REGNUM);
+ fop = get_frame_register_unsigned (frame, I387_FOP_REGNUM);
+
top = ((fstat >> 11) & 7);
for (fpreg = 7; fpreg >= 0; fpreg--)
{
- unsigned char raw[FPU_REG_RAW_SIZE];
+ unsigned char raw[I386_MAX_REGISTER_SIZE];
int tag = (ftag >> (fpreg * 2)) & 3;
int i;
- printf_filtered ("%sR%d: ", fpreg == top ? "=>" : " ", fpreg);
+ fprintf_filtered (file, "%sR%d: ", fpreg == top ? "=>" : " ", fpreg);
switch (tag)
{
case 0:
- puts_filtered ("Valid ");
+ fputs_filtered ("Valid ", file);
break;
case 1:
- puts_filtered ("Zero ");
+ fputs_filtered ("Zero ", file);
break;
case 2:
- puts_filtered ("Special ");
+ fputs_filtered ("Special ", file);
break;
case 3:
- puts_filtered ("Empty ");
+ fputs_filtered ("Empty ", file);
break;
}
- read_register_gen ((fpreg + 8 - top) % 8 + FP0_REGNUM, raw);
+ get_frame_register (frame, (fpreg + 8 - top) % 8 + I387_ST0_REGNUM, raw);
- puts_filtered ("0x");
+ fputs_filtered ("0x", file);
for (i = 9; i >= 0; i--)
- printf_filtered ("%02x", raw[i]);
+ fprintf_filtered (file, "%02x", raw[i]);
if (tag != 3)
- print_i387_ext (raw);
+ print_i387_ext (raw, file);
- puts_filtered ("\n");
+ fputs_filtered ("\n", file);
}
- 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"));
+ fputs_filtered ("\n", file);
+
+ print_i387_status_word (fstat, file);
+ print_i387_control_word (fctrl, file);
+ fprintf_filtered (file, "Tag Word: %s\n",
+ hex_string_custom (ftag, 4));
+ fprintf_filtered (file, "Instruction Pointer: %s:",
+ hex_string_custom (fiseg, 2));
+ fprintf_filtered (file, "%s\n", hex_string_custom (fioff, 8));
+ fprintf_filtered (file, "Operand Pointer: %s:",
+ hex_string_custom (foseg, 2));
+ fprintf_filtered (file, "%s\n", hex_string_custom (fooff, 8));
+ fprintf_filtered (file, "Opcode: %s\n",
+ hex_string_custom (fop ? (fop | 0xd800) : 0, 4));
+
+#undef I387_ST0_REGNUM
+}
+\f
+
+/* 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)
+{
+ char 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.");
+ return;
+ }
+
+ /* Convert to TYPE. This should be a no-op if TYPE is equivalent to
+ the extended floating-point format used by the FPU. */
+ get_frame_register (frame, regnum, from);
+ convert_typed_floating (from, builtin_type_i387_ext, to, type);
+}
+
+/* Write the contents FROM of a value of type TYPE into register
+ REGNUM in frame FRAME. */
+
+void
+i387_value_to_register (struct frame_info *frame, int regnum,
+ struct type *type, const void *from)
+{
+ char 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.");
+ 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);
+ put_frame_register (frame, regnum, to);
+}
+\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. */
+
+static int fsave_offset[] =
+{
+ 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 - I387_ST0_REGNUM])
+\f
+
+/* 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_fsave (struct regcache *regcache, int regnum, const void *fsave)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
+ const char *regs = fsave;
+ int i;
+
+ gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM);
+
+ /* 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 (fsave == NULL)
+ {
+ regcache_raw_supply (regcache, i, NULL);
+ continue;
+ }
+
+ /* Most of the FPU control registers occupy only 16 bits in the
+ fsave area. Give those a special treatment. */
+ if (i >= I387_FCTRL_REGNUM
+ && i != I387_FIOFF_REGNUM && i != I387_FOOFF_REGNUM)
+ {
+ unsigned char val[4];
+
+ memcpy (val, FSAVE_ADDR (regs, i), 2);
+ val[2] = val[3] = 0;
+ if (i == I387_FOP_REGNUM)
+ val[1] &= ((1 << 3) - 1);
+ regcache_raw_supply (regcache, i, val);
+ }
+ 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)
+ {
+ char 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 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_collect_fsave (const struct regcache *regcache, int regnum, void *fsave)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ char *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 tdep->st0_regnum
+
+ for (i = I387_ST0_REGNUM; i < I387_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 >= I387_FCTRL_REGNUM
+ && i != I387_FIOFF_REGNUM && i != I387_FOOFF_REGNUM)
+ {
+ unsigned char buf[4];
+
+ regcache_raw_collect (regcache, i, buf);
+
+ if (i == I387_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 (regs, i))[1] & ~((1 << 3) - 1));
+ }
+ memcpy (FSAVE_ADDR (regs, i), buf, 2);
+ }
+ else
+ regcache_raw_collect (regcache, i, FSAVE_ADDR (regs, i));
+ }
+#undef I387_ST0_REGNUM
+}
+
+/* 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. */
+
+void
+i387_fill_fsave (void *fsave, int regnum)
+{
+ i387_collect_fsave (current_regcache, regnum, fsave);
+}
+\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, /* %st(0) through ... */
+ 48,
+ 64,
+ 80,
+ 96,
+ 112,
+ 128,
+ 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 + 4 * 16,
+ 160 + 5 * 16,
+ 160 + 6 * 16,
+ 160 + 7 * 16,
+ 160 + 8 * 16,
+ 160 + 9 * 16,
+ 160 + 10 * 16,
+ 160 + 11 * 16,
+ 160 + 12 * 16,
+ 160 + 13 * 16,
+ 160 + 14 * 16,
+ 160 + 15 * 16, /* ... %xmm15 (128 bits each). */
+};
+
+#define FXSAVE_ADDR(fxsave, regnum) \
+ (fxsave + fxsave_offset[regnum - I387_ST0_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. */
+
+#define FXSAVE_MXCSR_ADDR(fxsave) (fxsave + 24)
+
+static int i387_tag (const unsigned char *raw);
+\f
+
+/* 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 (struct regcache *regcache, int regnum, const void *fxsave)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
+ const char *regs = fxsave;
+ int i;
+
+ gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM);
+ gdb_assert (tdep->num_xmm_regs > 0);
+
+ /* 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_MXCSR_REGNUM; 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 >= I387_FCTRL_REGNUM && i < I387_XMM0_REGNUM
+ && i != I387_FIOFF_REGNUM && i != I387_FOOFF_REGNUM)
+ {
+ unsigned char val[4];
+
+ memcpy (val, FXSAVE_ADDR (regs, i), 2);
+ val[2] = val[3] = 0;
+ if (i == I387_FOP_REGNUM)
+ val[1] &= ((1 << 3) - 1);
+ else if (i== I387_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 (regs, I387_FSTAT_REGNUM))[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;
+ tag = i387_tag (FXSAVE_ADDR (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 (regs, i));
+ }
+
+ if (regnum == I387_MXCSR_REGNUM || regnum == -1)
+ {
+ if (regs == NULL)
+ regcache_raw_supply (regcache, I387_MXCSR_REGNUM, NULL);
+ else
+ regcache_raw_supply (regcache, I387_MXCSR_REGNUM,
+ FXSAVE_MXCSR_ADDR (regs));
+ }
+
+#undef I387_ST0_REGNUM
+#undef I387_NUM_XMM_REGS
+}
+
+/* Fill register REGNUM (if it is a floating-point or SSE register) in
+ *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_collect_fxsave (const struct regcache *regcache, int regnum, void *fxsave)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ char *regs = fxsave;
+ int i;
+
+ gdb_assert (tdep->st0_regnum >= I386_ST0_REGNUM);
+ gdb_assert (tdep->num_xmm_regs > 0);
+
+ /* 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_MXCSR_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 >= I387_FCTRL_REGNUM && i < I387_XMM0_REGNUM
+ && i != I387_FIOFF_REGNUM && i != I387_FOOFF_REGNUM)
+ {
+ unsigned char buf[4];
+
+ regcache_raw_collect (regcache, i, buf);
+
+ if (i == I387_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 (regs, i))[1] & ~((1 << 3) - 1));
+ }
+ else if (i == I387_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 (regs, i), buf, 2);
+ }
+ else
+ regcache_raw_collect (regcache, i, FXSAVE_ADDR (regs, i));
+ }
+
+ if (regnum == I387_MXCSR_REGNUM || regnum == -1)
+ regcache_raw_collect (regcache, I387_MXCSR_REGNUM,
+ FXSAVE_MXCSR_ADDR (regs));
+
+#undef I387_ST0_REGNUM
+#undef I387_NUM_XMM_REGS
+}
+
+/* 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. */
+
+void
+i387_fill_fxsave (void *fxsave, int regnum)
+{
+ i387_collect_fxsave (current_regcache, regnum, fxsave);
+}
+
+/* Recreate the FTW (tag word) valid bits from the 80-bit FP data in
+ *RAW. */
+
+static int
+i387_tag (const 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);
+ }
+ }
+}
+
+/* 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
}
projects / deliverable / binutils-gdb.git / blobdiff