| /* 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); |
| } |