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[/] [or1k/] [trunk/] [gdb-5.3/] [gdb/] [gdbserver/] [i387-fp.c] - Rev 1765
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/* i387-specific utility functions, for the remote server for GDB. Copyright 2000, 2001, 2002 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 2 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, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #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 int fctrl; unsigned int fstat; unsigned int ftag; unsigned int fioff; unsigned short fiseg; unsigned short fop; unsigned int fooff; unsigned int foseg; /* Space for eight 80-bit FP values. */ 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 int fiseg; unsigned int fooff; unsigned int foseg; unsigned int mxcsr; unsigned int _pad1; /* Space for eight 80-bit FP values in 128-bit spaces. */ char st_space[128]; /* Space for eight 128-bit XMM values, or 16 on x86-64. */ 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); *(unsigned short *) &fp->fctrl = val; collect_register_by_name ("fstat", &val); val &= 0xFFFF; *(unsigned short *) &fp->fstat = val; collect_register_by_name ("ftag", &val); val &= 0xFFFF; *(unsigned short *) &fp->ftag = val; collect_register_by_name ("fiseg", &val); val &= 0xFFFF; *(unsigned short *) &fp->fiseg = val; collect_register_by_name ("foseg", &val); val &= 0xFFFF; *(unsigned short *) &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); 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); *(unsigned short *) &fp->fctrl = val; collect_register_by_name ("fstat", &val); val &= 0xFFFF; *(unsigned short *) &fp->fstat = val; /* Convert to the simplifed tag form stored in fxsave data. */ collect_register_by_name ("ftag", &val); val &= 0xFFFF; for (i = 7; i >= 0; i--) { int tag = (val >> (i * 2)) & 3; if (tag != 3) val2 |= (1 << i); } *(unsigned short *) &fp->ftag = val2; collect_register_by_name ("fiseg", &val); val &= 0xFFFF; *(unsigned short *) &fp->fiseg = val; collect_register_by_name ("foseg", &val); val &= 0xFFFF; *(unsigned short *) &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 (val & (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); }