| 1 | /* Intel 387 floating point stuff. |
| 2 | Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1998, 1999, 2000, 2001 |
| 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 "defs.h" |
| 23 | #include "frame.h" |
| 24 | #include "inferior.h" |
| 25 | #include "language.h" |
| 26 | #include "value.h" |
| 27 | #include "gdbcore.h" |
| 28 | #include "floatformat.h" |
| 29 | #include "regcache.h" |
| 30 | |
| 31 | |
| 32 | /* FIXME: Eliminate the next two functions when we have the time to |
| 33 | change all the callers. */ |
| 34 | |
| 35 | void i387_to_double (char *from, char *to); |
| 36 | void double_to_i387 (char *from, char *to); |
| 37 | |
| 38 | void |
| 39 | i387_to_double (char *from, char *to) |
| 40 | { |
| 41 | floatformat_to_double (&floatformat_i387_ext, from, (double *) to); |
| 42 | } |
| 43 | |
| 44 | void |
| 45 | double_to_i387 (char *from, char *to) |
| 46 | { |
| 47 | floatformat_from_double (&floatformat_i387_ext, (double *) from, to); |
| 48 | } |
| 49 | |
| 50 | \f |
| 51 | /* FIXME: The functions on this page are used by the old `info float' |
| 52 | implementations that a few of the i386 targets provide. These |
| 53 | functions should be removed if all of these have been converted to |
| 54 | use the generic implementation based on the new register file |
| 55 | layout. */ |
| 56 | |
| 57 | static void print_387_control_bits (unsigned int control); |
| 58 | static void print_387_status_bits (unsigned int status); |
| 59 | |
| 60 | static void |
| 61 | print_387_control_bits (unsigned int control) |
| 62 | { |
| 63 | switch ((control >> 8) & 3) |
| 64 | { |
| 65 | case 0: |
| 66 | puts_unfiltered (" 24 bit; "); |
| 67 | break; |
| 68 | case 1: |
| 69 | puts_unfiltered (" (bad); "); |
| 70 | break; |
| 71 | case 2: |
| 72 | puts_unfiltered (" 53 bit; "); |
| 73 | break; |
| 74 | case 3: |
| 75 | puts_unfiltered (" 64 bit; "); |
| 76 | break; |
| 77 | } |
| 78 | switch ((control >> 10) & 3) |
| 79 | { |
| 80 | case 0: |
| 81 | puts_unfiltered ("NEAR; "); |
| 82 | break; |
| 83 | case 1: |
| 84 | puts_unfiltered ("DOWN; "); |
| 85 | break; |
| 86 | case 2: |
| 87 | puts_unfiltered ("UP; "); |
| 88 | break; |
| 89 | case 3: |
| 90 | puts_unfiltered ("CHOP; "); |
| 91 | break; |
| 92 | } |
| 93 | if (control & 0x3f) |
| 94 | { |
| 95 | puts_unfiltered ("mask"); |
| 96 | if (control & 0x0001) |
| 97 | puts_unfiltered (" INVAL"); |
| 98 | if (control & 0x0002) |
| 99 | puts_unfiltered (" DENOR"); |
| 100 | if (control & 0x0004) |
| 101 | puts_unfiltered (" DIVZ"); |
| 102 | if (control & 0x0008) |
| 103 | puts_unfiltered (" OVERF"); |
| 104 | if (control & 0x0010) |
| 105 | puts_unfiltered (" UNDER"); |
| 106 | if (control & 0x0020) |
| 107 | puts_unfiltered (" LOS"); |
| 108 | puts_unfiltered (";"); |
| 109 | } |
| 110 | |
| 111 | if (control & 0xe080) |
| 112 | warning ("\nreserved bits on: %s", |
| 113 | local_hex_string (control & 0xe080)); |
| 114 | } |
| 115 | |
| 116 | void |
| 117 | print_387_control_word (unsigned int control) |
| 118 | { |
| 119 | printf_filtered ("control %s:", local_hex_string(control & 0xffff)); |
| 120 | print_387_control_bits (control); |
| 121 | puts_unfiltered ("\n"); |
| 122 | } |
| 123 | |
| 124 | static void |
| 125 | print_387_status_bits (unsigned int status) |
| 126 | { |
| 127 | printf_unfiltered (" flags %d%d%d%d; ", |
| 128 | (status & 0x4000) != 0, |
| 129 | (status & 0x0400) != 0, |
| 130 | (status & 0x0200) != 0, |
| 131 | (status & 0x0100) != 0); |
| 132 | printf_unfiltered ("top %d; ", (status >> 11) & 7); |
| 133 | if (status & 0xff) |
| 134 | { |
| 135 | puts_unfiltered ("excep"); |
| 136 | if (status & 0x0001) puts_unfiltered (" INVAL"); |
| 137 | if (status & 0x0002) puts_unfiltered (" DENOR"); |
| 138 | if (status & 0x0004) puts_unfiltered (" DIVZ"); |
| 139 | if (status & 0x0008) puts_unfiltered (" OVERF"); |
| 140 | if (status & 0x0010) puts_unfiltered (" UNDER"); |
| 141 | if (status & 0x0020) puts_unfiltered (" LOS"); |
| 142 | if (status & 0x0040) puts_unfiltered (" STACK"); |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | void |
| 147 | print_387_status_word (unsigned int status) |
| 148 | { |
| 149 | printf_filtered ("status %s:", local_hex_string (status & 0xffff)); |
| 150 | print_387_status_bits (status); |
| 151 | puts_unfiltered ("\n"); |
| 152 | } |
| 153 | |
| 154 | \f |
| 155 | /* Implement the `info float' layout based on the register definitions |
| 156 | in `tm-i386.h'. */ |
| 157 | |
| 158 | /* Print the floating point number specified by RAW. */ |
| 159 | static void |
| 160 | print_i387_value (char *raw) |
| 161 | { |
| 162 | DOUBLEST value; |
| 163 | |
| 164 | /* Avoid call to floatformat_to_doublest if possible to preserve as |
| 165 | much information as possible. */ |
| 166 | |
| 167 | #ifdef HAVE_LONG_DOUBLE |
| 168 | if (sizeof (value) == sizeof (long double) |
| 169 | && HOST_LONG_DOUBLE_FORMAT == &floatformat_i387_ext) |
| 170 | { |
| 171 | /* Copy straight over, but take care of the padding. */ |
| 172 | memcpy (&value, raw, FPU_REG_RAW_SIZE); |
| 173 | memset ((char *) &value + FPU_REG_RAW_SIZE, 0, |
| 174 | sizeof (value) - FPU_REG_RAW_SIZE); |
| 175 | } |
| 176 | else |
| 177 | #endif |
| 178 | floatformat_to_doublest (&floatformat_i387_ext, raw, &value); |
| 179 | |
| 180 | /* We try to print 19 digits. The last digit may or may not contain |
| 181 | garbage, but we'd better print one too many. We need enough room |
| 182 | to print the value, 1 position for the sign, 1 for the decimal |
| 183 | point, 19 for the digits and 6 for the exponent adds up to 27. */ |
| 184 | #ifdef PRINTF_HAS_LONG_DOUBLE |
| 185 | printf_filtered (" %-+27.19Lg", (long double) value); |
| 186 | #else |
| 187 | printf_filtered (" %-+27.19g", (double) value); |
| 188 | #endif |
| 189 | } |
| 190 | |
| 191 | /* Print the classification for the register contents RAW. */ |
| 192 | static void |
| 193 | print_i387_ext (unsigned char *raw) |
| 194 | { |
| 195 | int sign; |
| 196 | int integer; |
| 197 | unsigned int exponent; |
| 198 | unsigned long fraction[2]; |
| 199 | |
| 200 | sign = raw[9] & 0x80; |
| 201 | integer = raw[7] & 0x80; |
| 202 | exponent = (((raw[9] & 0x7f) << 8) | raw[8]); |
| 203 | fraction[0] = ((raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0]); |
| 204 | fraction[1] = (((raw[7] & 0x7f) << 24) | (raw[6] << 16) |
| 205 | | (raw[5] << 8) | raw[4]); |
| 206 | |
| 207 | if (exponent == 0x7fff && integer) |
| 208 | { |
| 209 | if (fraction[0] == 0x00000000 && fraction[1] == 0x00000000) |
| 210 | /* Infinity. */ |
| 211 | printf_filtered (" %cInf", (sign ? '-' : '+')); |
| 212 | else if (sign && fraction[0] == 0x00000000 && fraction[1] == 0x40000000) |
| 213 | /* Real Indefinite (QNaN). */ |
| 214 | puts_unfiltered (" Real Indefinite (QNaN)"); |
| 215 | else if (fraction[1] & 0x40000000) |
| 216 | /* QNaN. */ |
| 217 | puts_filtered (" QNaN"); |
| 218 | else |
| 219 | /* SNaN. */ |
| 220 | puts_filtered (" SNaN"); |
| 221 | } |
| 222 | else if (exponent < 0x7fff && exponent > 0x0000 && integer) |
| 223 | /* Normal. */ |
| 224 | print_i387_value (raw); |
| 225 | else if (exponent == 0x0000) |
| 226 | { |
| 227 | /* Denormal or zero. */ |
| 228 | print_i387_value (raw); |
| 229 | |
| 230 | if (integer) |
| 231 | /* Pseudo-denormal. */ |
| 232 | puts_filtered (" Pseudo-denormal"); |
| 233 | else if (fraction[0] || fraction[1]) |
| 234 | /* Denormal. */ |
| 235 | puts_filtered (" Denormal"); |
| 236 | } |
| 237 | else |
| 238 | /* Unsupported. */ |
| 239 | puts_filtered (" Unsupported"); |
| 240 | } |
| 241 | |
| 242 | /* Print the status word STATUS. */ |
| 243 | static void |
| 244 | print_i387_status_word (unsigned int status) |
| 245 | { |
| 246 | printf_filtered ("Status Word: %s", |
| 247 | local_hex_string_custom (status, "04")); |
| 248 | puts_filtered (" "); |
| 249 | printf_filtered (" %s", (status & 0x0001) ? "IE" : " "); |
| 250 | printf_filtered (" %s", (status & 0x0002) ? "DE" : " "); |
| 251 | printf_filtered (" %s", (status & 0x0004) ? "ZE" : " "); |
| 252 | printf_filtered (" %s", (status & 0x0008) ? "OE" : " "); |
| 253 | printf_filtered (" %s", (status & 0x0010) ? "UE" : " "); |
| 254 | printf_filtered (" %s", (status & 0x0020) ? "PE" : " "); |
| 255 | puts_filtered (" "); |
| 256 | printf_filtered (" %s", (status & 0x0080) ? "ES" : " "); |
| 257 | puts_filtered (" "); |
| 258 | printf_filtered (" %s", (status & 0x0040) ? "SF" : " "); |
| 259 | puts_filtered (" "); |
| 260 | printf_filtered (" %s", (status & 0x0100) ? "C0" : " "); |
| 261 | printf_filtered (" %s", (status & 0x0200) ? "C1" : " "); |
| 262 | printf_filtered (" %s", (status & 0x0400) ? "C2" : " "); |
| 263 | printf_filtered (" %s", (status & 0x4000) ? "C3" : " "); |
| 264 | |
| 265 | puts_filtered ("\n"); |
| 266 | |
| 267 | printf_filtered (" TOP: %d\n", ((status >> 11) & 7)); |
| 268 | } |
| 269 | |
| 270 | /* Print the control word CONTROL. */ |
| 271 | static void |
| 272 | print_i387_control_word (unsigned int control) |
| 273 | { |
| 274 | printf_filtered ("Control Word: %s", |
| 275 | local_hex_string_custom (control, "04")); |
| 276 | puts_filtered (" "); |
| 277 | printf_filtered (" %s", (control & 0x0001) ? "IM" : " "); |
| 278 | printf_filtered (" %s", (control & 0x0002) ? "DM" : " "); |
| 279 | printf_filtered (" %s", (control & 0x0004) ? "ZM" : " "); |
| 280 | printf_filtered (" %s", (control & 0x0008) ? "OM" : " "); |
| 281 | printf_filtered (" %s", (control & 0x0010) ? "UM" : " "); |
| 282 | printf_filtered (" %s", (control & 0x0020) ? "PM" : " "); |
| 283 | |
| 284 | puts_filtered ("\n"); |
| 285 | |
| 286 | puts_filtered (" PC: "); |
| 287 | switch ((control >> 8) & 3) |
| 288 | { |
| 289 | case 0: |
| 290 | puts_filtered ("Single Precision (24-bits)\n"); |
| 291 | break; |
| 292 | case 1: |
| 293 | puts_filtered ("Reserved\n"); |
| 294 | break; |
| 295 | case 2: |
| 296 | puts_filtered ("Double Precision (53-bits)\n"); |
| 297 | break; |
| 298 | case 3: |
| 299 | puts_filtered ("Extended Precision (64-bits)\n"); |
| 300 | break; |
| 301 | } |
| 302 | |
| 303 | puts_filtered (" RC: "); |
| 304 | switch ((control >> 10) & 3) |
| 305 | { |
| 306 | case 0: |
| 307 | puts_filtered ("Round to nearest\n"); |
| 308 | break; |
| 309 | case 1: |
| 310 | puts_filtered ("Round down\n"); |
| 311 | break; |
| 312 | case 2: |
| 313 | puts_filtered ("Round up\n"); |
| 314 | break; |
| 315 | case 3: |
| 316 | puts_filtered ("Round toward zero\n"); |
| 317 | break; |
| 318 | } |
| 319 | } |
| 320 | |
| 321 | /* Print out the i387 floating poin state. */ |
| 322 | void |
| 323 | i387_float_info (void) |
| 324 | { |
| 325 | unsigned int fctrl; |
| 326 | unsigned int fstat; |
| 327 | unsigned int ftag; |
| 328 | unsigned int fiseg; |
| 329 | unsigned int fioff; |
| 330 | unsigned int foseg; |
| 331 | unsigned int fooff; |
| 332 | unsigned int fop; |
| 333 | int fpreg; |
| 334 | int top; |
| 335 | |
| 336 | fctrl = read_register (FCTRL_REGNUM); |
| 337 | fstat = read_register (FSTAT_REGNUM); |
| 338 | ftag = read_register (FTAG_REGNUM); |
| 339 | fiseg = read_register (FCS_REGNUM); |
| 340 | fioff = read_register (FCOFF_REGNUM); |
| 341 | foseg = read_register (FDS_REGNUM); |
| 342 | fooff = read_register (FDOFF_REGNUM); |
| 343 | fop = read_register (FOP_REGNUM); |
| 344 | |
| 345 | top = ((fstat >> 11) & 7); |
| 346 | |
| 347 | for (fpreg = 7; fpreg >= 0; fpreg--) |
| 348 | { |
| 349 | unsigned char raw[FPU_REG_RAW_SIZE]; |
| 350 | int tag = (ftag >> (fpreg * 2)) & 3; |
| 351 | int i; |
| 352 | |
| 353 | printf_filtered ("%sR%d: ", fpreg == top ? "=>" : " ", fpreg); |
| 354 | |
| 355 | switch (tag) |
| 356 | { |
| 357 | case 0: |
| 358 | puts_filtered ("Valid "); |
| 359 | break; |
| 360 | case 1: |
| 361 | puts_filtered ("Zero "); |
| 362 | break; |
| 363 | case 2: |
| 364 | puts_filtered ("Special "); |
| 365 | break; |
| 366 | case 3: |
| 367 | puts_filtered ("Empty "); |
| 368 | break; |
| 369 | } |
| 370 | |
| 371 | read_register_gen ((fpreg + 8 - top) % 8 + FP0_REGNUM, raw); |
| 372 | |
| 373 | puts_filtered ("0x"); |
| 374 | for (i = 9; i >= 0; i--) |
| 375 | printf_filtered ("%02x", raw[i]); |
| 376 | |
| 377 | if (tag != 3) |
| 378 | print_i387_ext (raw); |
| 379 | |
| 380 | puts_filtered ("\n"); |
| 381 | } |
| 382 | |
| 383 | puts_filtered ("\n"); |
| 384 | |
| 385 | print_i387_status_word (fstat); |
| 386 | print_i387_control_word (fctrl); |
| 387 | printf_filtered ("Tag Word: %s\n", |
| 388 | local_hex_string_custom (ftag, "04")); |
| 389 | printf_filtered ("Instruction Pointer: %s:", |
| 390 | local_hex_string_custom (fiseg, "02")); |
| 391 | printf_filtered ("%s\n", local_hex_string_custom (fioff, "08")); |
| 392 | printf_filtered ("Operand Pointer: %s:", |
| 393 | local_hex_string_custom (foseg, "02")); |
| 394 | printf_filtered ("%s\n", local_hex_string_custom (fooff, "08")); |
| 395 | printf_filtered ("Opcode: %s\n", |
| 396 | local_hex_string_custom (fop ? (fop | 0xd800) : 0, "04")); |
| 397 | } |