#include "defs.h"
#include "frame.h"
#include "inferior.h"
#include "language.h"
#include "value.h"
#include "gdbcore.h"
#include "floatformat.h"
#include "regcache.h"
#include "gdb_assert.h"
#include "gdb_string.h"
#include "doublest.h"
#include "i386-tdep.h"
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);
}
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");
}
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");
}
}
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");
}
static void
print_i387_value (char *raw, struct ui_file *file)
{
DOUBLEST value;
value = extract_typed_floating (raw, builtin_type_i387_ext);
#ifdef PRINTF_HAS_LONG_DOUBLE
fprintf_filtered (file, " %-+27.19Lg", (long double) value);
#else
fprintf_filtered (file, " %-+27.19g", (double) value);
#endif
}
static void
print_i387_ext (unsigned char *raw, struct ui_file *file)
{
int sign;
int integer;
unsigned int exponent;
unsigned long fraction[2];
sign = raw[9] & 0x80;
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 && integer)
{
if (fraction[0] == 0x00000000 && fraction[1] == 0x00000000)
fprintf_filtered (file, " %cInf", (sign ? '-' : '+'));
else if (sign && fraction[0] == 0x00000000 && fraction[1] == 0x40000000)
fputs_unfiltered (" Real Indefinite (QNaN)", file);
else if (fraction[1] & 0x40000000)
fputs_filtered (" QNaN", file);
else
fputs_filtered (" SNaN", file);
}
else if (exponent < 0x7fff && exponent > 0x0000 && integer)
print_i387_value (raw, file);
else if (exponent == 0x0000)
{
print_i387_value (raw, file);
if (integer)
fputs_filtered (" Pseudo-denormal", file);
else if (fraction[0] || fraction[1])
fputs_filtered (" Denormal", file);
}
else
fputs_filtered (" Unsupported", file);
}
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"));
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));
}
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"));
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:
fputs_filtered ("Single Precision (24-bits)\n", file);
break;
case 1:
fputs_filtered ("Reserved\n", file);
break;
case 2:
fputs_filtered ("Double Precision (53-bits)\n", file);
break;
case 3:
fputs_filtered ("Extended Precision (64-bits)\n", file);
break;
}
fputs_filtered (" RC: ", file);
switch ((control >> 10) & 3)
{
case 0:
fputs_filtered ("Round to nearest\n", file);
break;
case 1:
fputs_filtered ("Round down\n", file);
break;
case 2:
fputs_filtered ("Round up\n", file);
break;
case 3:
fputs_filtered ("Round toward zero\n", file);
break;
}
}
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;
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);
top = ((fstat >> 11) & 7);
for (fpreg = 7; fpreg >= 0; fpreg--)
{
unsigned char raw[FPU_REG_RAW_SIZE];
int tag = (ftag >> (fpreg * 2)) & 3;
int i;
fprintf_filtered (file, "%sR%d: ", fpreg == top ? "=>" : " ", fpreg);
switch (tag)
{
case 0:
fputs_filtered ("Valid ", file);
break;
case 1:
fputs_filtered ("Zero ", file);
break;
case 2:
fputs_filtered ("Special ", file);
break;
case 3:
fputs_filtered ("Empty ", file);
break;
}
read_register_gen ((fpreg + 8 - top) % 8 + FP0_REGNUM, 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);
fputs_filtered ("\n", file);
}
puts_filtered ("\n");
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"));
fprintf_filtered (file, "Instruction Pointer: %s:",
local_hex_string_custom (fiseg, "02"));
fprintf_filtered (file, "%s\n", local_hex_string_custom (fioff, "08"));
fprintf_filtered (file, "Operand Pointer: %s:",
local_hex_string_custom (foseg, "02"));
fprintf_filtered (file, "%s\n", local_hex_string_custom (fooff, "08"));
fprintf_filtered (file, "Opcode: %s\n",
local_hex_string_custom (fop ? (fop | 0xd800) : 0, "04"));
}
static int fsave_offset[] =
{
28 + 0 * FPU_REG_RAW_SIZE,
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,
0,
4,
8,
16,
12,
24,
20,
18
};
#define FSAVE_ADDR(fsave, regnum) (fsave + fsave_offset[regnum - FP0_REGNUM])
void
i387_supply_register (int regnum, char *fsave)
{
if (fsave == NULL)
{
supply_register (regnum, NULL);
return;
}
if (regnum >= FPC_REGNUM
&& regnum != FIOFF_REGNUM && regnum != FOOFF_REGNUM)
{
unsigned char val[4];
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));
}
void
i387_supply_fsave (char *fsave)
{
int i;
for (i = FP0_REGNUM; i < XMM0_REGNUM; i++)
i387_supply_register (i, fsave);
}
void
i387_fill_fsave (char *fsave, int regnum)
{
int i;
for (i = FP0_REGNUM; i < XMM0_REGNUM; i++)
if (regnum == -1 || regnum == i)
{
if (i >= FPC_REGNUM
&& i != FIOFF_REGNUM && i != FOOFF_REGNUM)
{
unsigned char buf[4];
regcache_collect (i, buf);
if (i == FOP_REGNUM)
{
buf[1] &= ((1 << 3) - 1);
buf[1] |= ((FSAVE_ADDR (fsave, i))[1] & ~((1 << 3) - 1));
}
memcpy (FSAVE_ADDR (fsave, i), buf, 2);
}
else
regcache_collect (i, FSAVE_ADDR (fsave, i));
}
}
static int fxsave_offset[] =
{
32,
48,
64,
80,
96,
112,
128,
144,
0,
2,
4,
12,
8,
20,
16,
6,
160,
176,
192,
208,
224,
240,
256,
272,
24,
};
#define FXSAVE_ADDR(fxsave, regnum) \
(fxsave + fxsave_offset[regnum - FP0_REGNUM])
static int i387_tag (unsigned char *raw);
void
i387_supply_fxsave (char *fxsave)
{
int i, last_regnum = MXCSR_REGNUM;
if (gdbarch_tdep (current_gdbarch)->num_xmm_regs == 0)
last_regnum = FOP_REGNUM;
for (i = FP0_REGNUM; i <= last_regnum; i++)
{
if (fxsave == NULL)
{
supply_register (i, NULL);
continue;
}
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)
{
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;
ftag |= tag << (2 * fpreg);
}
val[0] = ftag & 0xff;
val[1] = (ftag >> 8) & 0xff;
}
supply_register (i, val);
}
else
supply_register (i, FXSAVE_ADDR (fxsave, i));
}
}
void
i387_fill_fxsave (char *fxsave, int regnum)
{
int i, last_regnum = MXCSR_REGNUM;
if (gdbarch_tdep (current_gdbarch)->num_xmm_regs == 0)
last_regnum = FOP_REGNUM;
for (i = FP0_REGNUM; i <= last_regnum; i++)
if (regnum == -1 || regnum == i)
{
if (i >= FPC_REGNUM && i < XMM0_REGNUM
&& i != FIOFF_REGNUM && i != FDOFF_REGNUM)
{
unsigned char buf[4];
regcache_collect (i, buf);
if (i == FOP_REGNUM)
{
buf[1] &= ((1 << 3) - 1);
buf[1] |= ((FXSAVE_ADDR (fxsave, i))[1] & ~((1 << 3) - 1));
}
else if (i == FTAG_REGNUM)
{
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 (fxsave, i), buf, 2);
}
else
regcache_collect (i, FXSAVE_ADDR (fxsave, i));
}
}
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)
{
return (2);
}
else if (exponent == 0x0000)
{
if (fraction[0] == 0x0000 && fraction[1] == 0x0000 && !integer)
{
return (1);
}
else
{
return (2);
}
}
else
{
if (integer)
{
return (0);
}
else
{
return (2);
}
}
}