| 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 | } |