566 lines
15 KiB
C
566 lines
15 KiB
C
/* i387-specific utility functions, for the remote server for GDB.
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Copyright (C) 2000, 2001, 2002, 2005, 2007, 2008, 2009, 2010, 2011
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Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "server.h"
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#include "i387-fp.h"
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#include "i386-xstate.h"
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int num_xmm_registers = 8;
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/* Note: These functions preserve the reserved bits in control registers.
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However, gdbserver promptly throws away that information. */
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/* These structs should have the proper sizes and alignment on both
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i386 and x86-64 machines. */
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struct i387_fsave {
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/* All these are only sixteen bits, plus padding, except for fop (which
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is only eleven bits), and fooff / fioff (which are 32 bits each). */
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unsigned short fctrl;
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unsigned short pad1;
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unsigned short fstat;
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unsigned short pad2;
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unsigned short ftag;
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unsigned short pad3;
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unsigned int fioff;
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unsigned short fiseg;
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unsigned short fop;
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unsigned int fooff;
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unsigned short foseg;
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unsigned short pad4;
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/* Space for eight 80-bit FP values. */
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unsigned char st_space[80];
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};
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struct i387_fxsave {
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/* All these are only sixteen bits, plus padding, except for fop (which
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is only eleven bits), and fooff / fioff (which are 32 bits each). */
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unsigned short fctrl;
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unsigned short fstat;
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unsigned short ftag;
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unsigned short fop;
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unsigned int fioff;
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unsigned short fiseg;
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unsigned short pad1;
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unsigned int fooff;
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unsigned short foseg;
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unsigned short pad12;
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unsigned int mxcsr;
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unsigned int pad3;
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/* Space for eight 80-bit FP values in 128-bit spaces. */
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unsigned char st_space[128];
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/* Space for eight 128-bit XMM values, or 16 on x86-64. */
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unsigned char xmm_space[256];
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};
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struct i387_xsave {
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/* All these are only sixteen bits, plus padding, except for fop (which
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is only eleven bits), and fooff / fioff (which are 32 bits each). */
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unsigned short fctrl;
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unsigned short fstat;
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unsigned short ftag;
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unsigned short fop;
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unsigned int fioff;
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unsigned short fiseg;
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unsigned short pad1;
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unsigned int fooff;
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unsigned short foseg;
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unsigned short pad12;
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unsigned int mxcsr;
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unsigned int mxcsr_mask;
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/* Space for eight 80-bit FP values in 128-bit spaces. */
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unsigned char st_space[128];
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/* Space for eight 128-bit XMM values, or 16 on x86-64. */
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unsigned char xmm_space[256];
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unsigned char reserved1[48];
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/* The extended control register 0 (the XFEATURE_ENABLED_MASK
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register). */
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unsigned long long xcr0;
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unsigned char reserved2[40];
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/* The XSTATE_BV bit vector. */
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unsigned long long xstate_bv;
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unsigned char reserved3[56];
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/* Space for eight upper 128-bit YMM values, or 16 on x86-64. */
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unsigned char ymmh_space[256];
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};
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void
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i387_cache_to_fsave (struct regcache *regcache, void *buf)
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{
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struct i387_fsave *fp = (struct i387_fsave *) buf;
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int i;
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int st0_regnum = find_regno ("st0");
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unsigned long val, val2;
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for (i = 0; i < 8; i++)
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collect_register (regcache, i + st0_regnum,
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((char *) &fp->st_space[0]) + i * 10);
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collect_register_by_name (regcache, "fioff", &fp->fioff);
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collect_register_by_name (regcache, "fooff", &fp->fooff);
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/* This one's 11 bits... */
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collect_register_by_name (regcache, "fop", &val2);
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fp->fop = (val2 & 0x7FF) | (fp->fop & 0xF800);
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/* Some registers are 16-bit. */
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collect_register_by_name (regcache, "fctrl", &val);
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fp->fctrl = val;
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collect_register_by_name (regcache, "fstat", &val);
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val &= 0xFFFF;
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fp->fstat = val;
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collect_register_by_name (regcache, "ftag", &val);
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val &= 0xFFFF;
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fp->ftag = val;
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collect_register_by_name (regcache, "fiseg", &val);
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val &= 0xFFFF;
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fp->fiseg = val;
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collect_register_by_name (regcache, "foseg", &val);
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val &= 0xFFFF;
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fp->foseg = val;
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}
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void
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i387_fsave_to_cache (struct regcache *regcache, const void *buf)
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{
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struct i387_fsave *fp = (struct i387_fsave *) buf;
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int i;
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int st0_regnum = find_regno ("st0");
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unsigned long val;
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for (i = 0; i < 8; i++)
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supply_register (regcache, i + st0_regnum,
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((char *) &fp->st_space[0]) + i * 10);
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supply_register_by_name (regcache, "fioff", &fp->fioff);
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supply_register_by_name (regcache, "fooff", &fp->fooff);
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/* Some registers are 16-bit. */
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val = fp->fctrl & 0xFFFF;
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supply_register_by_name (regcache, "fctrl", &val);
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val = fp->fstat & 0xFFFF;
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supply_register_by_name (regcache, "fstat", &val);
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val = fp->ftag & 0xFFFF;
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supply_register_by_name (regcache, "ftag", &val);
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val = fp->fiseg & 0xFFFF;
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supply_register_by_name (regcache, "fiseg", &val);
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val = fp->foseg & 0xFFFF;
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supply_register_by_name (regcache, "foseg", &val);
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/* fop has only 11 valid bits. */
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val = (fp->fop) & 0x7FF;
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supply_register_by_name (regcache, "fop", &val);
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}
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void
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i387_cache_to_fxsave (struct regcache *regcache, void *buf)
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{
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struct i387_fxsave *fp = (struct i387_fxsave *) buf;
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int i;
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int st0_regnum = find_regno ("st0");
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int xmm0_regnum = find_regno ("xmm0");
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unsigned long val, val2;
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for (i = 0; i < 8; i++)
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collect_register (regcache, i + st0_regnum,
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((char *) &fp->st_space[0]) + i * 16);
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for (i = 0; i < num_xmm_registers; i++)
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collect_register (regcache, i + xmm0_regnum,
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((char *) &fp->xmm_space[0]) + i * 16);
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collect_register_by_name (regcache, "fioff", &fp->fioff);
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collect_register_by_name (regcache, "fooff", &fp->fooff);
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collect_register_by_name (regcache, "mxcsr", &fp->mxcsr);
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/* This one's 11 bits... */
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collect_register_by_name (regcache, "fop", &val2);
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fp->fop = (val2 & 0x7FF) | (fp->fop & 0xF800);
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/* Some registers are 16-bit. */
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collect_register_by_name (regcache, "fctrl", &val);
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fp->fctrl = val;
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collect_register_by_name (regcache, "fstat", &val);
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fp->fstat = val;
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/* Convert to the simplifed tag form stored in fxsave data. */
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collect_register_by_name (regcache, "ftag", &val);
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val &= 0xFFFF;
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val2 = 0;
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for (i = 7; i >= 0; i--)
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{
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int tag = (val >> (i * 2)) & 3;
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if (tag != 3)
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val2 |= (1 << i);
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}
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fp->ftag = val2;
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collect_register_by_name (regcache, "fiseg", &val);
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fp->fiseg = val;
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collect_register_by_name (regcache, "foseg", &val);
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fp->foseg = val;
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}
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void
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i387_cache_to_xsave (struct regcache *regcache, void *buf)
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{
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struct i387_xsave *fp = (struct i387_xsave *) buf;
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int i;
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unsigned long val, val2;
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unsigned int clear_bv;
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unsigned long long xstate_bv = 0;
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char raw[16];
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char *p;
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/* The supported bits in `xstat_bv' are 1 byte. Clear part in
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vector registers if its bit in xstat_bv is zero. */
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clear_bv = (~fp->xstate_bv) & x86_xcr0;
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/* Clear part in x87 and vector registers if its bit in xstat_bv is
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zero. */
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if (clear_bv)
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{
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if ((clear_bv & I386_XSTATE_X87))
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for (i = 0; i < 8; i++)
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memset (((char *) &fp->st_space[0]) + i * 16, 0, 10);
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if ((clear_bv & I386_XSTATE_SSE))
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for (i = 0; i < num_xmm_registers; i++)
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memset (((char *) &fp->xmm_space[0]) + i * 16, 0, 16);
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if ((clear_bv & I386_XSTATE_AVX))
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for (i = 0; i < num_xmm_registers; i++)
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memset (((char *) &fp->ymmh_space[0]) + i * 16, 0, 16);
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}
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/* Check if any x87 registers are changed. */
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if ((x86_xcr0 & I386_XSTATE_X87))
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{
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int st0_regnum = find_regno ("st0");
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for (i = 0; i < 8; i++)
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{
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collect_register (regcache, i + st0_regnum, raw);
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p = ((char *) &fp->st_space[0]) + i * 16;
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if (memcmp (raw, p, 10))
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{
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xstate_bv |= I386_XSTATE_X87;
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memcpy (p, raw, 10);
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}
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}
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}
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/* Check if any SSE registers are changed. */
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if ((x86_xcr0 & I386_XSTATE_SSE))
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{
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int xmm0_regnum = find_regno ("xmm0");
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for (i = 0; i < num_xmm_registers; i++)
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{
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collect_register (regcache, i + xmm0_regnum, raw);
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p = ((char *) &fp->xmm_space[0]) + i * 16;
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if (memcmp (raw, p, 16))
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{
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xstate_bv |= I386_XSTATE_SSE;
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memcpy (p, raw, 16);
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}
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}
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}
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/* Check if any AVX registers are changed. */
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if ((x86_xcr0 & I386_XSTATE_AVX))
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{
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int ymm0h_regnum = find_regno ("ymm0h");
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for (i = 0; i < num_xmm_registers; i++)
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{
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collect_register (regcache, i + ymm0h_regnum, raw);
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p = ((char *) &fp->ymmh_space[0]) + i * 16;
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if (memcmp (raw, p, 16))
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{
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xstate_bv |= I386_XSTATE_AVX;
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memcpy (p, raw, 16);
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}
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}
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}
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/* Update the corresponding bits in xstate_bv if any SSE/AVX
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registers are changed. */
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fp->xstate_bv |= xstate_bv;
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collect_register_by_name (regcache, "fioff", &fp->fioff);
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collect_register_by_name (regcache, "fooff", &fp->fooff);
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collect_register_by_name (regcache, "mxcsr", &fp->mxcsr);
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/* This one's 11 bits... */
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collect_register_by_name (regcache, "fop", &val2);
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fp->fop = (val2 & 0x7FF) | (fp->fop & 0xF800);
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/* Some registers are 16-bit. */
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collect_register_by_name (regcache, "fctrl", &val);
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fp->fctrl = val;
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collect_register_by_name (regcache, "fstat", &val);
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fp->fstat = val;
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/* Convert to the simplifed tag form stored in fxsave data. */
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collect_register_by_name (regcache, "ftag", &val);
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val &= 0xFFFF;
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val2 = 0;
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for (i = 7; i >= 0; i--)
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{
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int tag = (val >> (i * 2)) & 3;
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if (tag != 3)
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val2 |= (1 << i);
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}
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fp->ftag = val2;
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collect_register_by_name (regcache, "fiseg", &val);
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fp->fiseg = val;
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collect_register_by_name (regcache, "foseg", &val);
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fp->foseg = val;
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}
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static int
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i387_ftag (struct i387_fxsave *fp, int regno)
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{
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unsigned char *raw = &fp->st_space[regno * 16];
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unsigned int exponent;
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unsigned long fraction[2];
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int integer;
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integer = raw[7] & 0x80;
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exponent = (((raw[9] & 0x7f) << 8) | raw[8]);
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fraction[0] = ((raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0]);
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fraction[1] = (((raw[7] & 0x7f) << 24) | (raw[6] << 16)
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| (raw[5] << 8) | raw[4]);
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if (exponent == 0x7fff)
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{
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/* Special. */
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return (2);
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}
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else if (exponent == 0x0000)
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{
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if (fraction[0] == 0x0000 && fraction[1] == 0x0000 && !integer)
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{
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/* Zero. */
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return (1);
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}
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else
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{
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/* Special. */
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return (2);
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}
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}
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else
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{
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if (integer)
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{
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/* Valid. */
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return (0);
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}
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else
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{
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/* Special. */
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return (2);
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}
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}
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}
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void
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i387_fxsave_to_cache (struct regcache *regcache, const void *buf)
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{
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struct i387_fxsave *fp = (struct i387_fxsave *) buf;
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int i, top;
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int st0_regnum = find_regno ("st0");
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int xmm0_regnum = find_regno ("xmm0");
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unsigned long val;
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for (i = 0; i < 8; i++)
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supply_register (regcache, i + st0_regnum,
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((char *) &fp->st_space[0]) + i * 16);
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for (i = 0; i < num_xmm_registers; i++)
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supply_register (regcache, i + xmm0_regnum,
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((char *) &fp->xmm_space[0]) + i * 16);
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supply_register_by_name (regcache, "fioff", &fp->fioff);
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supply_register_by_name (regcache, "fooff", &fp->fooff);
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supply_register_by_name (regcache, "mxcsr", &fp->mxcsr);
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/* Some registers are 16-bit. */
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val = fp->fctrl & 0xFFFF;
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supply_register_by_name (regcache, "fctrl", &val);
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val = fp->fstat & 0xFFFF;
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supply_register_by_name (regcache, "fstat", &val);
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/* Generate the form of ftag data that GDB expects. */
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top = (fp->fstat >> 11) & 0x7;
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val = 0;
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for (i = 7; i >= 0; i--)
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{
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int tag;
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if (fp->ftag & (1 << i))
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tag = i387_ftag (fp, (i + 8 - top) % 8);
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else
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tag = 3;
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val |= tag << (2 * i);
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}
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supply_register_by_name (regcache, "ftag", &val);
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val = fp->fiseg & 0xFFFF;
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supply_register_by_name (regcache, "fiseg", &val);
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val = fp->foseg & 0xFFFF;
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supply_register_by_name (regcache, "foseg", &val);
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val = (fp->fop) & 0x7FF;
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supply_register_by_name (regcache, "fop", &val);
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}
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void
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i387_xsave_to_cache (struct regcache *regcache, const void *buf)
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{
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struct i387_xsave *fp = (struct i387_xsave *) buf;
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struct i387_fxsave *fxp = (struct i387_fxsave *) buf;
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int i, top;
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unsigned long val;
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unsigned int clear_bv;
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gdb_byte *p;
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/* The supported bits in `xstat_bv' are 1 byte. Clear part in
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vector registers if its bit in xstat_bv is zero. */
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clear_bv = (~fp->xstate_bv) & x86_xcr0;
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/* Check if any x87 registers are changed. */
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if ((x86_xcr0 & I386_XSTATE_X87) != 0)
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{
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int st0_regnum = find_regno ("st0");
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if ((clear_bv & I386_XSTATE_X87) != 0)
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{
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for (i = 0; i < 8; i++)
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supply_register_zeroed (regcache, i + st0_regnum);
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}
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else
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{
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p = (gdb_byte *) &fp->st_space[0];
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for (i = 0; i < 8; i++)
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supply_register (regcache, i + st0_regnum, p + i * 16);
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}
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}
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if ((x86_xcr0 & I386_XSTATE_SSE) != 0)
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{
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int xmm0_regnum = find_regno ("xmm0");
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if ((clear_bv & I386_XSTATE_SSE))
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{
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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;
|