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binutils-gdb/gdb/gdbserver/i387-fp.c
Joel Brobecker 28e7fd6234 Update years in copyright notice for the GDB files. 
Two modifications:
  1. The addition of 2013 to the copyright year range for every file;
  2. The use of a single year range, instead of potentially multiple
     year ranges, as approved by the FSF.
2013-01-01 06:33:28 +00:00

565 lines
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/* i387-specific utility functions, for the remote server for GDB.
Copyright (C) 2000-2013 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"
#include "i386-xstate.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];
};
struct i387_xsave {
/* 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 mxcsr_mask;
/* 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];
unsigned char reserved1[48];
/* The extended control register 0 (the XFEATURE_ENABLED_MASK
register). */
unsigned long long xcr0;
unsigned char reserved2[40];
/* The XSTATE_BV bit vector. */
unsigned long long xstate_bv;
unsigned char reserved3[56];
/* Space for eight upper 128-bit YMM values, or 16 on x86-64. */
unsigned char ymmh_space[256];
};
void
i387_cache_to_fsave (struct regcache *regcache, 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 (regcache, i + st0_regnum,
((char *) &fp->st_space[0]) + i * 10);
collect_register_by_name (regcache, "fioff", &fp->fioff);
collect_register_by_name (regcache, "fooff", &fp->fooff);
/* This one's 11 bits... */
collect_register_by_name (regcache, "fop", &val2);
fp->fop = (val2 & 0x7FF) | (fp->fop & 0xF800);
/* Some registers are 16-bit. */
collect_register_by_name (regcache, "fctrl", &val);
fp->fctrl = val;
collect_register_by_name (regcache, "fstat", &val);
val &= 0xFFFF;
fp->fstat = val;
collect_register_by_name (regcache, "ftag", &val);
val &= 0xFFFF;
fp->ftag = val;
collect_register_by_name (regcache, "fiseg", &val);
val &= 0xFFFF;
fp->fiseg = val;
collect_register_by_name (regcache, "foseg", &val);
val &= 0xFFFF;
fp->foseg = val;
}
void
i387_fsave_to_cache (struct regcache *regcache, 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 (regcache, i + st0_regnum,
((char *) &fp->st_space[0]) + i * 10);
supply_register_by_name (regcache, "fioff", &fp->fioff);
supply_register_by_name (regcache, "fooff", &fp->fooff);
/* Some registers are 16-bit. */
val = fp->fctrl & 0xFFFF;
supply_register_by_name (regcache, "fctrl", &val);
val = fp->fstat & 0xFFFF;
supply_register_by_name (regcache, "fstat", &val);
val = fp->ftag & 0xFFFF;
supply_register_by_name (regcache, "ftag", &val);
val = fp->fiseg & 0xFFFF;
supply_register_by_name (regcache, "fiseg", &val);
val = fp->foseg & 0xFFFF;
supply_register_by_name (regcache, "foseg", &val);
/* fop has only 11 valid bits. */
val = (fp->fop) & 0x7FF;
supply_register_by_name (regcache, "fop", &val);
}
void
i387_cache_to_fxsave (struct regcache *regcache, 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 (regcache, i + st0_regnum,
((char *) &fp->st_space[0]) + i * 16);
for (i = 0; i < num_xmm_registers; i++)
collect_register (regcache, i + xmm0_regnum,
((char *) &fp->xmm_space[0]) + i * 16);
collect_register_by_name (regcache, "fioff", &fp->fioff);
collect_register_by_name (regcache, "fooff", &fp->fooff);
collect_register_by_name (regcache, "mxcsr", &fp->mxcsr);
/* This one's 11 bits... */
collect_register_by_name (regcache, "fop", &val2);
fp->fop = (val2 & 0x7FF) | (fp->fop & 0xF800);
/* Some registers are 16-bit. */
collect_register_by_name (regcache, "fctrl", &val);
fp->fctrl = val;
collect_register_by_name (regcache, "fstat", &val);
fp->fstat = val;
/* Convert to the simplifed tag form stored in fxsave data. */
collect_register_by_name (regcache, "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 (regcache, "fiseg", &val);
fp->fiseg = val;
collect_register_by_name (regcache, "foseg", &val);
fp->foseg = val;
}
void
i387_cache_to_xsave (struct regcache *regcache, void *buf)
{
struct i387_xsave *fp = (struct i387_xsave *) buf;
int i;
unsigned long val, val2;
unsigned int clear_bv;
unsigned long long xstate_bv = 0;
char raw[16];
char *p;
/* The supported bits in `xstat_bv' are 1 byte. Clear part in
vector registers if its bit in xstat_bv is zero. */
clear_bv = (~fp->xstate_bv) & x86_xcr0;
/* Clear part in x87 and vector registers if its bit in xstat_bv is
zero. */
if (clear_bv)
{
if ((clear_bv & I386_XSTATE_X87))
for (i = 0; i < 8; i++)
memset (((char *) &fp->st_space[0]) + i * 16, 0, 10);
if ((clear_bv & I386_XSTATE_SSE))
for (i = 0; i < num_xmm_registers; i++)
memset (((char *) &fp->xmm_space[0]) + i * 16, 0, 16);
if ((clear_bv & I386_XSTATE_AVX))
for (i = 0; i < num_xmm_registers; i++)
memset (((char *) &fp->ymmh_space[0]) + i * 16, 0, 16);
}
/* Check if any x87 registers are changed. */
if ((x86_xcr0 & I386_XSTATE_X87))
{
int st0_regnum = find_regno ("st0");
for (i = 0; i < 8; i++)
{
collect_register (regcache, i + st0_regnum, raw);
p = ((char *) &fp->st_space[0]) + i * 16;
if (memcmp (raw, p, 10))
{
xstate_bv |= I386_XSTATE_X87;
memcpy (p, raw, 10);
}
}
}
/* Check if any SSE registers are changed. */
if ((x86_xcr0 & I386_XSTATE_SSE))
{
int xmm0_regnum = find_regno ("xmm0");
for (i = 0; i < num_xmm_registers; i++)
{
collect_register (regcache, i + xmm0_regnum, raw);
p = ((char *) &fp->xmm_space[0]) + i * 16;
if (memcmp (raw, p, 16))
{
xstate_bv |= I386_XSTATE_SSE;
memcpy (p, raw, 16);
}
}
}
/* Check if any AVX registers are changed. */
if ((x86_xcr0 & I386_XSTATE_AVX))
{
int ymm0h_regnum = find_regno ("ymm0h");
for (i = 0; i < num_xmm_registers; i++)
{
collect_register (regcache, i + ymm0h_regnum, raw);
p = ((char *) &fp->ymmh_space[0]) + i * 16;
if (memcmp (raw, p, 16))
{
xstate_bv |= I386_XSTATE_AVX;
memcpy (p, raw, 16);
}
}
}
/* Update the corresponding bits in xstate_bv if any SSE/AVX
registers are changed. */
fp->xstate_bv |= xstate_bv;
collect_register_by_name (regcache, "fioff", &fp->fioff);
collect_register_by_name (regcache, "fooff", &fp->fooff);
collect_register_by_name (regcache, "mxcsr", &fp->mxcsr);
/* This one's 11 bits... */
collect_register_by_name (regcache, "fop", &val2);
fp->fop = (val2 & 0x7FF) | (fp->fop & 0xF800);
/* Some registers are 16-bit. */
collect_register_by_name (regcache, "fctrl", &val);
fp->fctrl = val;
collect_register_by_name (regcache, "fstat", &val);
fp->fstat = val;
/* Convert to the simplifed tag form stored in fxsave data. */
collect_register_by_name (regcache, "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 (regcache, "fiseg", &val);
fp->fiseg = val;
collect_register_by_name (regcache, "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 (struct regcache *regcache, 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 (regcache, i + st0_regnum,
((char *) &fp->st_space[0]) + i * 16);
for (i = 0; i < num_xmm_registers; i++)
supply_register (regcache, i + xmm0_regnum,
((char *) &fp->xmm_space[0]) + i * 16);
supply_register_by_name (regcache, "fioff", &fp->fioff);
supply_register_by_name (regcache, "fooff", &fp->fooff);
supply_register_by_name (regcache, "mxcsr", &fp->mxcsr);
/* Some registers are 16-bit. */
val = fp->fctrl & 0xFFFF;
supply_register_by_name (regcache, "fctrl", &val);
val = fp->fstat & 0xFFFF;
supply_register_by_name (regcache, "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 (regcache, "ftag", &val);
val = fp->fiseg & 0xFFFF;
supply_register_by_name (regcache, "fiseg", &val);
val = fp->foseg & 0xFFFF;
supply_register_by_name (regcache, "foseg", &val);
val = (fp->fop) & 0x7FF;
supply_register_by_name (regcache, "fop", &val);
}
void
i387_xsave_to_cache (struct regcache *regcache, const void *buf)
{
struct i387_xsave *fp = (struct i387_xsave *) buf;
struct i387_fxsave *fxp = (struct i387_fxsave *) buf;
int i, top;
unsigned long val;
unsigned int clear_bv;
gdb_byte *p;
/* The supported bits in `xstat_bv' are 1 byte. Clear part in
vector registers if its bit in xstat_bv is zero. */
clear_bv = (~fp->xstate_bv) & x86_xcr0;
/* Check if any x87 registers are changed. */
if ((x86_xcr0 & I386_XSTATE_X87) != 0)
{
int st0_regnum = find_regno ("st0");
if ((clear_bv & I386_XSTATE_X87) != 0)
{
for (i = 0; i < 8; i++)
supply_register_zeroed (regcache, i + st0_regnum);
}
else
{
p = (gdb_byte *) &fp->st_space[0];
for (i = 0; i < 8; i++)
supply_register (regcache, i + st0_regnum, p + i * 16);
}
}
if ((x86_xcr0 & I386_XSTATE_SSE) != 0)
{
int xmm0_regnum = find_regno ("xmm0");
if ((clear_bv & I386_XSTATE_SSE))
{
for (i = 0; i < num_xmm_registers; i++)
supply_register_zeroed (regcache, i + xmm0_regnum);
}
else
{
p = (gdb_byte *) &fp->xmm_space[0];
for (i = 0; i < num_xmm_registers; i++)
supply_register (regcache, i + xmm0_regnum, p + i * 16);
}
}
if ((x86_xcr0 & I386_XSTATE_AVX) != 0)
{
int ymm0h_regnum = find_regno ("ymm0h");
if ((clear_bv & I386_XSTATE_AVX) != 0)
{
for (i = 0; i < num_xmm_registers; i++)
supply_register_zeroed (regcache, i + ymm0h_regnum);
}
else
{
p = (gdb_byte *) &fp->ymmh_space[0];
for (i = 0; i < num_xmm_registers; i++)
supply_register (regcache, i + ymm0h_regnum, p + i * 16);
}
}
supply_register_by_name (regcache, "fioff", &fp->fioff);
supply_register_by_name (regcache, "fooff", &fp->fooff);
supply_register_by_name (regcache, "mxcsr", &fp->mxcsr);
/* Some registers are 16-bit. */
val = fp->fctrl & 0xFFFF;
supply_register_by_name (regcache, "fctrl", &val);
val = fp->fstat & 0xFFFF;
supply_register_by_name (regcache, "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 (fxp, (i + 8 - top) % 8);
else
tag = 3;
val |= tag << (2 * i);
}
supply_register_by_name (regcache, "ftag", &val);
val = fp->fiseg & 0xFFFF;
supply_register_by_name (regcache, "fiseg", &val);
val = fp->foseg & 0xFFFF;
supply_register_by_name (regcache, "foseg", &val);
val = (fp->fop) & 0x7FF;
supply_register_by_name (regcache, "fop", &val);
}
/* Default to SSE. */
unsigned long long x86_xcr0 = I386_XSTATE_SSE_MASK;
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