293 lines
7.5 KiB
C
293 lines
7.5 KiB
C
/* i387-specific utility functions, for the remote server for GDB.
|
|
Copyright (C) 2000, 2001, 2002, 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 3 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, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#include "server.h"
|
|
#include "i387-fp.h"
|
|
|
|
int num_xmm_registers = 8;
|
|
|
|
/* Note: These functions preserve the reserved bits in control registers.
|
|
However, gdbserver promptly throws away that information. */
|
|
|
|
/* These structs should have the proper sizes and alignment on both
|
|
i386 and x86-64 machines. */
|
|
|
|
struct i387_fsave {
|
|
/* All these are only sixteen bits, plus padding, except for fop (which
|
|
is only eleven bits), and fooff / fioff (which are 32 bits each). */
|
|
unsigned short fctrl;
|
|
unsigned short pad1;
|
|
unsigned short fstat;
|
|
unsigned short pad2;
|
|
unsigned short ftag;
|
|
unsigned short pad3;
|
|
unsigned int fioff;
|
|
unsigned short fiseg;
|
|
unsigned short fop;
|
|
unsigned int fooff;
|
|
unsigned short foseg;
|
|
unsigned short pad4;
|
|
|
|
/* Space for eight 80-bit FP values. */
|
|
unsigned char st_space[80];
|
|
};
|
|
|
|
struct i387_fxsave {
|
|
/* All these are only sixteen bits, plus padding, except for fop (which
|
|
is only eleven bits), and fooff / fioff (which are 32 bits each). */
|
|
unsigned short fctrl;
|
|
unsigned short fstat;
|
|
unsigned short ftag;
|
|
unsigned short fop;
|
|
unsigned int fioff;
|
|
unsigned short fiseg;
|
|
unsigned short pad1;
|
|
unsigned int fooff;
|
|
unsigned short foseg;
|
|
unsigned short pad12;
|
|
|
|
unsigned int mxcsr;
|
|
unsigned int pad3;
|
|
|
|
/* Space for eight 80-bit FP values in 128-bit spaces. */
|
|
unsigned char st_space[128];
|
|
|
|
/* Space for eight 128-bit XMM values, or 16 on x86-64. */
|
|
unsigned char xmm_space[256];
|
|
};
|
|
|
|
void
|
|
i387_cache_to_fsave (void *buf)
|
|
{
|
|
struct i387_fsave *fp = (struct i387_fsave *) buf;
|
|
int i;
|
|
int st0_regnum = find_regno ("st0");
|
|
unsigned long val, val2;
|
|
|
|
for (i = 0; i < 8; i++)
|
|
collect_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 10);
|
|
|
|
collect_register_by_name ("fioff", &fp->fioff);
|
|
collect_register_by_name ("fooff", &fp->fooff);
|
|
|
|
/* This one's 11 bits... */
|
|
collect_register_by_name ("fop", &val2);
|
|
fp->fop = (val2 & 0x7FF) | (fp->fop & 0xF800);
|
|
|
|
/* Some registers are 16-bit. */
|
|
collect_register_by_name ("fctrl", &val);
|
|
fp->fctrl = val;
|
|
|
|
collect_register_by_name ("fstat", &val);
|
|
val &= 0xFFFF;
|
|
fp->fstat = val;
|
|
|
|
collect_register_by_name ("ftag", &val);
|
|
val &= 0xFFFF;
|
|
fp->ftag = val;
|
|
|
|
collect_register_by_name ("fiseg", &val);
|
|
val &= 0xFFFF;
|
|
fp->fiseg = val;
|
|
|
|
collect_register_by_name ("foseg", &val);
|
|
val &= 0xFFFF;
|
|
fp->foseg = val;
|
|
}
|
|
|
|
void
|
|
i387_fsave_to_cache (const void *buf)
|
|
{
|
|
struct i387_fsave *fp = (struct i387_fsave *) buf;
|
|
int i;
|
|
int st0_regnum = find_regno ("st0");
|
|
unsigned long val;
|
|
|
|
for (i = 0; i < 8; i++)
|
|
supply_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 10);
|
|
|
|
supply_register_by_name ("fioff", &fp->fioff);
|
|
supply_register_by_name ("fooff", &fp->fooff);
|
|
|
|
/* Some registers are 16-bit. */
|
|
val = fp->fctrl & 0xFFFF;
|
|
supply_register_by_name ("fctrl", &val);
|
|
|
|
val = fp->fstat & 0xFFFF;
|
|
supply_register_by_name ("fstat", &val);
|
|
|
|
val = fp->ftag & 0xFFFF;
|
|
supply_register_by_name ("ftag", &val);
|
|
|
|
val = fp->fiseg & 0xFFFF;
|
|
supply_register_by_name ("fiseg", &val);
|
|
|
|
val = fp->foseg & 0xFFFF;
|
|
supply_register_by_name ("foseg", &val);
|
|
|
|
/* fop has only 11 valid bits. */
|
|
val = (fp->fop) & 0x7FF;
|
|
supply_register_by_name ("fop", &val);
|
|
}
|
|
|
|
void
|
|
i387_cache_to_fxsave (void *buf)
|
|
{
|
|
struct i387_fxsave *fp = (struct i387_fxsave *) buf;
|
|
int i;
|
|
int st0_regnum = find_regno ("st0");
|
|
int xmm0_regnum = find_regno ("xmm0");
|
|
unsigned long val, val2;
|
|
|
|
for (i = 0; i < 8; i++)
|
|
collect_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 16);
|
|
for (i = 0; i < num_xmm_registers; i++)
|
|
collect_register (i + xmm0_regnum, ((char *) &fp->xmm_space[0]) + i * 16);
|
|
|
|
collect_register_by_name ("fioff", &fp->fioff);
|
|
collect_register_by_name ("fooff", &fp->fooff);
|
|
collect_register_by_name ("mxcsr", &fp->mxcsr);
|
|
|
|
/* This one's 11 bits... */
|
|
collect_register_by_name ("fop", &val2);
|
|
fp->fop = (val2 & 0x7FF) | (fp->fop & 0xF800);
|
|
|
|
/* Some registers are 16-bit. */
|
|
collect_register_by_name ("fctrl", &val);
|
|
fp->fctrl = val;
|
|
|
|
collect_register_by_name ("fstat", &val);
|
|
fp->fstat = val;
|
|
|
|
/* Convert to the simplifed tag form stored in fxsave data. */
|
|
collect_register_by_name ("ftag", &val);
|
|
val &= 0xFFFF;
|
|
val2 = 0;
|
|
for (i = 7; i >= 0; i--)
|
|
{
|
|
int tag = (val >> (i * 2)) & 3;
|
|
|
|
if (tag != 3)
|
|
val2 |= (1 << i);
|
|
}
|
|
fp->ftag = val2;
|
|
|
|
collect_register_by_name ("fiseg", &val);
|
|
fp->fiseg = val;
|
|
|
|
collect_register_by_name ("foseg", &val);
|
|
fp->foseg = val;
|
|
}
|
|
|
|
static int
|
|
i387_ftag (struct i387_fxsave *fp, int regno)
|
|
{
|
|
unsigned char *raw = &fp->st_space[regno * 16];
|
|
unsigned int exponent;
|
|
unsigned long fraction[2];
|
|
int integer;
|
|
|
|
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);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
i387_fxsave_to_cache (const void *buf)
|
|
{
|
|
struct i387_fxsave *fp = (struct i387_fxsave *) buf;
|
|
int i, top;
|
|
int st0_regnum = find_regno ("st0");
|
|
int xmm0_regnum = find_regno ("xmm0");
|
|
unsigned long val;
|
|
|
|
for (i = 0; i < 8; i++)
|
|
supply_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 16);
|
|
for (i = 0; i < num_xmm_registers; i++)
|
|
supply_register (i + xmm0_regnum, ((char *) &fp->xmm_space[0]) + i * 16);
|
|
|
|
supply_register_by_name ("fioff", &fp->fioff);
|
|
supply_register_by_name ("fooff", &fp->fooff);
|
|
supply_register_by_name ("mxcsr", &fp->mxcsr);
|
|
|
|
/* Some registers are 16-bit. */
|
|
val = fp->fctrl & 0xFFFF;
|
|
supply_register_by_name ("fctrl", &val);
|
|
|
|
val = fp->fstat & 0xFFFF;
|
|
supply_register_by_name ("fstat", &val);
|
|
|
|
/* Generate the form of ftag data that GDB expects. */
|
|
top = (fp->fstat >> 11) & 0x7;
|
|
val = 0;
|
|
for (i = 7; i >= 0; i--)
|
|
{
|
|
int tag;
|
|
if (fp->ftag & (1 << i))
|
|
tag = i387_ftag (fp, (i + 8 - top) % 8);
|
|
else
|
|
tag = 3;
|
|
val |= tag << (2 * i);
|
|
}
|
|
supply_register_by_name ("ftag", &val);
|
|
|
|
val = fp->fiseg & 0xFFFF;
|
|
supply_register_by_name ("fiseg", &val);
|
|
|
|
val = fp->foseg & 0xFFFF;
|
|
supply_register_by_name ("foseg", &val);
|
|
|
|
val = (fp->fop) & 0x7FF;
|
|
supply_register_by_name ("fop", &val);
|
|
}
|