1 /* i387-specific utility functions, for the remote server for GDB. 2 Copyright 2000, 2001, 2002 3 Free Software Foundation, Inc. 4 5 This file is part of GDB. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 59 Temple Place - Suite 330, 20 Boston, MA 02111-1307, USA. */ 21 22 #include "server.h" 23 #include "i387-fp.h" 24 25 int num_xmm_registers = 8; 26 27 /* Note: These functions preserve the reserved bits in control registers. 28 However, gdbserver promptly throws away that information. */ 29 30 /* These structs should have the proper sizes and alignment on both 31 i386 and x86-64 machines. */ 32 33 struct i387_fsave { 34 /* All these are only sixteen bits, plus padding, except for fop (which 35 is only eleven bits), and fooff / fioff (which are 32 bits each). */ 36 unsigned int fctrl; 37 unsigned int fstat; 38 unsigned int ftag; 39 unsigned int fioff; 40 unsigned short fiseg; 41 unsigned short fop; 42 unsigned int fooff; 43 unsigned int foseg; 44 45 /* Space for eight 80-bit FP values. */ 46 char st_space[80]; 47 }; 48 49 struct i387_fxsave { 50 /* All these are only sixteen bits, plus padding, except for fop (which 51 is only eleven bits), and fooff / fioff (which are 32 bits each). */ 52 unsigned short fctrl; 53 unsigned short fstat; 54 unsigned short ftag; 55 unsigned short fop; 56 unsigned int fioff; 57 unsigned int fiseg; 58 unsigned int fooff; 59 unsigned int foseg; 60 61 unsigned int mxcsr; 62 63 unsigned int _pad1; 64 65 /* Space for eight 80-bit FP values in 128-bit spaces. */ 66 char st_space[128]; 67 68 /* Space for eight 128-bit XMM values, or 16 on x86-64. */ 69 char xmm_space[256]; 70 }; 71 72 void 73 i387_cache_to_fsave (void *buf) 74 { 75 struct i387_fsave *fp = (struct i387_fsave *) buf; 76 int i; 77 int st0_regnum = find_regno ("st0"); 78 unsigned long val, val2; 79 80 for (i = 0; i < 8; i++) 81 collect_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 10); 82 83 collect_register_by_name ("fioff", &fp->fioff); 84 collect_register_by_name ("fooff", &fp->fooff); 85 86 /* This one's 11 bits... */ 87 collect_register_by_name ("fop", &val2); 88 fp->fop = (val2 & 0x7FF) | (fp->fop & 0xF800); 89 90 /* Some registers are 16-bit. */ 91 collect_register_by_name ("fctrl", &val); 92 *(unsigned short *) &fp->fctrl = val; 93 94 collect_register_by_name ("fstat", &val); 95 val &= 0xFFFF; 96 *(unsigned short *) &fp->fstat = val; 97 98 collect_register_by_name ("ftag", &val); 99 val &= 0xFFFF; 100 *(unsigned short *) &fp->ftag = val; 101 102 collect_register_by_name ("fiseg", &val); 103 val &= 0xFFFF; 104 *(unsigned short *) &fp->fiseg = val; 105 106 collect_register_by_name ("foseg", &val); 107 val &= 0xFFFF; 108 *(unsigned short *) &fp->foseg = val; 109 } 110 111 void 112 i387_fsave_to_cache (const void *buf) 113 { 114 struct i387_fsave *fp = (struct i387_fsave *) buf; 115 int i; 116 int st0_regnum = find_regno ("st0"); 117 unsigned long val; 118 119 for (i = 0; i < 8; i++) 120 supply_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 10); 121 122 supply_register_by_name ("fioff", &fp->fioff); 123 supply_register_by_name ("fooff", &fp->fooff); 124 125 /* Some registers are 16-bit. */ 126 val = fp->fctrl & 0xFFFF; 127 supply_register_by_name ("fctrl", &val); 128 129 val = fp->fstat & 0xFFFF; 130 supply_register_by_name ("fstat", &val); 131 132 val = fp->ftag & 0xFFFF; 133 supply_register_by_name ("ftag", &val); 134 135 val = fp->fiseg & 0xFFFF; 136 supply_register_by_name ("fiseg", &val); 137 138 val = fp->foseg & 0xFFFF; 139 supply_register_by_name ("foseg", &val); 140 141 val = (fp->fop) & 0x7FF; 142 supply_register_by_name ("fop", &val); 143 } 144 145 void 146 i387_cache_to_fxsave (void *buf) 147 { 148 struct i387_fxsave *fp = (struct i387_fxsave *) buf; 149 int i; 150 int st0_regnum = find_regno ("st0"); 151 int xmm0_regnum = find_regno ("xmm0"); 152 unsigned long val, val2; 153 154 for (i = 0; i < 8; i++) 155 collect_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 16); 156 for (i = 0; i < num_xmm_registers; i++) 157 collect_register (i + xmm0_regnum, ((char *) &fp->xmm_space[0]) + i * 16); 158 159 collect_register_by_name ("fioff", &fp->fioff); 160 collect_register_by_name ("fooff", &fp->fooff); 161 collect_register_by_name ("mxcsr", &fp->mxcsr); 162 163 /* This one's 11 bits... */ 164 collect_register_by_name ("fop", &val2); 165 fp->fop = (val2 & 0x7FF) | (fp->fop & 0xF800); 166 167 /* Some registers are 16-bit. */ 168 collect_register_by_name ("fctrl", &val); 169 *(unsigned short *) &fp->fctrl = val; 170 171 collect_register_by_name ("fstat", &val); 172 val &= 0xFFFF; 173 *(unsigned short *) &fp->fstat = val; 174 175 /* Convert to the simplifed tag form stored in fxsave data. */ 176 collect_register_by_name ("ftag", &val); 177 val &= 0xFFFF; 178 for (i = 7; i >= 0; i--) 179 { 180 int tag = (val >> (i * 2)) & 3; 181 182 if (tag != 3) 183 val2 |= (1 << i); 184 } 185 *(unsigned short *) &fp->ftag = val2; 186 187 collect_register_by_name ("fiseg", &val); 188 val &= 0xFFFF; 189 *(unsigned short *) &fp->fiseg = val; 190 191 collect_register_by_name ("foseg", &val); 192 val &= 0xFFFF; 193 *(unsigned short *) &fp->foseg = val; 194 } 195 196 static int 197 i387_ftag (struct i387_fxsave *fp, int regno) 198 { 199 unsigned char *raw = &fp->st_space[regno * 16]; 200 unsigned int exponent; 201 unsigned long fraction[2]; 202 int integer; 203 204 integer = raw[7] & 0x80; 205 exponent = (((raw[9] & 0x7f) << 8) | raw[8]); 206 fraction[0] = ((raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0]); 207 fraction[1] = (((raw[7] & 0x7f) << 24) | (raw[6] << 16) 208 | (raw[5] << 8) | raw[4]); 209 210 if (exponent == 0x7fff) 211 { 212 /* Special. */ 213 return (2); 214 } 215 else if (exponent == 0x0000) 216 { 217 if (fraction[0] == 0x0000 && fraction[1] == 0x0000 && !integer) 218 { 219 /* Zero. */ 220 return (1); 221 } 222 else 223 { 224 /* Special. */ 225 return (2); 226 } 227 } 228 else 229 { 230 if (integer) 231 { 232 /* Valid. */ 233 return (0); 234 } 235 else 236 { 237 /* Special. */ 238 return (2); 239 } 240 } 241 } 242 243 void 244 i387_fxsave_to_cache (const void *buf) 245 { 246 struct i387_fxsave *fp = (struct i387_fxsave *) buf; 247 int i, top; 248 int st0_regnum = find_regno ("st0"); 249 int xmm0_regnum = find_regno ("xmm0"); 250 unsigned long val; 251 252 for (i = 0; i < 8; i++) 253 supply_register (i + st0_regnum, ((char *) &fp->st_space[0]) + i * 16); 254 for (i = 0; i < num_xmm_registers; i++) 255 supply_register (i + xmm0_regnum, ((char *) &fp->xmm_space[0]) + i * 16); 256 257 supply_register_by_name ("fioff", &fp->fioff); 258 supply_register_by_name ("fooff", &fp->fooff); 259 supply_register_by_name ("mxcsr", &fp->mxcsr); 260 261 /* Some registers are 16-bit. */ 262 val = fp->fctrl & 0xFFFF; 263 supply_register_by_name ("fctrl", &val); 264 265 val = fp->fstat & 0xFFFF; 266 supply_register_by_name ("fstat", &val); 267 268 /* Generate the form of ftag data that GDB expects. */ 269 top = (fp->fstat >> 11) & 0x7; 270 val = 0; 271 for (i = 7; i >= 0; i--) 272 { 273 int tag; 274 if (val & (1 << i)) 275 tag = i387_ftag (fp, (i + 8 - top) % 8); 276 else 277 tag = 3; 278 val |= tag << (2 * i); 279 } 280 supply_register_by_name ("ftag", &val); 281 282 val = fp->fiseg & 0xFFFF; 283 supply_register_by_name ("fiseg", &val); 284 285 val = fp->foseg & 0xFFFF; 286 supply_register_by_name ("foseg", &val); 287 288 val = (fp->fop) & 0x7FF; 289 supply_register_by_name ("fop", &val); 290 } 291