| 1 | /* Sequent Symmetry host interface, for GDB when running under Unix. |
| 2 | Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | GDB is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 1, or (at your option) |
| 9 | any later version. |
| 10 | |
| 11 | GDB is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with GDB; see the file COPYING. If not, write to |
| 18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | /* many 387-specific items of use taken from i386-dep.c */ |
| 21 | |
| 22 | #include <stdio.h> |
| 23 | #include "defs.h" |
| 24 | #include "param.h" |
| 25 | #include "frame.h" |
| 26 | #include "inferior.h" |
| 27 | #include "symtab.h" |
| 28 | |
| 29 | #include <signal.h> |
| 30 | #include <sys/param.h> |
| 31 | #include <sys/user.h> |
| 32 | #include <sys/dir.h> |
| 33 | #include <sys/ioctl.h> |
| 34 | #include <sys/stat.h> |
| 35 | #include "gdbcore.h" |
| 36 | #include <fcntl.h> |
| 37 | |
| 38 | static long i386_get_frame_setup (); |
| 39 | static i386_follow_jump (); |
| 40 | |
| 41 | #include <sgtty.h> |
| 42 | #define TERMINAL struct sgttyb |
| 43 | |
| 44 | store_inferior_registers(regno) |
| 45 | int regno; |
| 46 | { |
| 47 | struct pt_regset regs; |
| 48 | int reg_tmp, i; |
| 49 | extern char registers[]; |
| 50 | |
| 51 | #if 0 |
| 52 | /* PREPARE_TO_STORE deals with this. */ |
| 53 | if (-1 == regno) |
| 54 | { |
| 55 | #endif |
| 56 | regs.pr_eax = *(int *)®isters[REGISTER_BYTE(0)]; |
| 57 | regs.pr_ebx = *(int *)®isters[REGISTER_BYTE(5)]; |
| 58 | regs.pr_ecx = *(int *)®isters[REGISTER_BYTE(2)]; |
| 59 | regs.pr_edx = *(int *)®isters[REGISTER_BYTE(1)]; |
| 60 | regs.pr_esi = *(int *)®isters[REGISTER_BYTE(6)]; |
| 61 | regs.pr_edi = *(int *)®isters[REGISTER_BYTE(7)]; |
| 62 | regs.pr_esp = *(int *)®isters[REGISTER_BYTE(14)]; |
| 63 | regs.pr_ebp = *(int *)®isters[REGISTER_BYTE(15)]; |
| 64 | regs.pr_eip = *(int *)®isters[REGISTER_BYTE(16)]; |
| 65 | regs.pr_flags = *(int *)®isters[REGISTER_BYTE(17)]; |
| 66 | for (i = 0; i < 31; i++) { |
| 67 | regs.pr_fpa.fpa_regs[i] = |
| 68 | *(int *)®isters[REGISTER_BYTE(FP1_REGNUM+i)]; |
| 69 | } |
| 70 | #if 0 |
| 71 | } |
| 72 | else |
| 73 | { |
| 74 | reg_tmp = *(int *)®isters[REGISTER_BYTE(regno)]; |
| 75 | ptrace(XPT_RREGS, inferior_pid, ®s, 0); |
| 76 | switch (regno) |
| 77 | { |
| 78 | case 0: |
| 79 | regs.pr_eax = *(int *)®isters[REGISTER_BYTE(0)]; |
| 80 | break; |
| 81 | case 5: |
| 82 | regs.pr_ebx = *(int *)®isters[REGISTER_BYTE(5)]; |
| 83 | break; |
| 84 | case 2: |
| 85 | regs.pr_ecx = *(int *)®isters[REGISTER_BYTE(2)]; |
| 86 | break; |
| 87 | case 1: |
| 88 | regs.pr_edx = *(int *)®isters[REGISTER_BYTE(1)]; |
| 89 | break; |
| 90 | case 6: |
| 91 | regs.pr_esi = *(int *)®isters[REGISTER_BYTE(6)]; |
| 92 | break; |
| 93 | case 7: |
| 94 | regs.pr_edi = *(int *)®isters[REGISTER_BYTE(7)]; |
| 95 | break; |
| 96 | case 15: |
| 97 | regs.pr_ebp = *(int *)®isters[REGISTER_BYTE(15)]; |
| 98 | break; |
| 99 | case 14: |
| 100 | regs.pr_esp = *(int *)®isters[REGISTER_BYTE(14)]; |
| 101 | break; |
| 102 | case 16: |
| 103 | regs.pr_eip = *(int *)®isters[REGISTER_BYTE(16)]; |
| 104 | break; |
| 105 | case 17: |
| 106 | regs.pr_flags = *(int *)®isters[REGISTER_BYTE(17)]; |
| 107 | break; |
| 108 | } |
| 109 | } |
| 110 | #endif /* 0 */ |
| 111 | ptrace(XPT_WREGS, inferior_pid, ®s, 0); |
| 112 | } |
| 113 | |
| 114 | void |
| 115 | fetch_inferior_registers() |
| 116 | { |
| 117 | int i; |
| 118 | struct pt_regset regs; |
| 119 | extern char registers[]; |
| 120 | |
| 121 | registers_fetched (); |
| 122 | |
| 123 | ptrace(XPT_RREGS, inferior_pid, ®s, 0); |
| 124 | *(int *)®isters[REGISTER_BYTE(0)] = regs.pr_eax; |
| 125 | *(int *)®isters[REGISTER_BYTE(5)] = regs.pr_ebx; |
| 126 | *(int *)®isters[REGISTER_BYTE(2)] = regs.pr_ecx; |
| 127 | *(int *)®isters[REGISTER_BYTE(1)] = regs.pr_edx; |
| 128 | *(int *)®isters[REGISTER_BYTE(6)] = regs.pr_esi; |
| 129 | *(int *)®isters[REGISTER_BYTE(7)] = regs.pr_edi; |
| 130 | *(int *)®isters[REGISTER_BYTE(15)] = regs.pr_ebp; |
| 131 | *(int *)®isters[REGISTER_BYTE(14)] = regs.pr_esp; |
| 132 | *(int *)®isters[REGISTER_BYTE(16)] = regs.pr_eip; |
| 133 | *(int *)®isters[REGISTER_BYTE(17)] = regs.pr_flags; |
| 134 | for (i = 0; i < FPA_NREGS; i++) { |
| 135 | *(int *)®isters[REGISTER_BYTE(FP1_REGNUM+i)] = regs.pr_fpa.fpa_regs[i]; |
| 136 | } |
| 137 | bcopy(regs.pr_fpu.fpu_stack[0], ®isters[REGISTER_BYTE(3)], 10); |
| 138 | bcopy(regs.pr_fpu.fpu_stack[1], ®isters[REGISTER_BYTE(4)], 10); |
| 139 | bcopy(regs.pr_fpu.fpu_stack[2], ®isters[REGISTER_BYTE(8)], 10); |
| 140 | bcopy(regs.pr_fpu.fpu_stack[3], ®isters[REGISTER_BYTE(9)], 10); |
| 141 | bcopy(regs.pr_fpu.fpu_stack[4], ®isters[REGISTER_BYTE(10)], 10); |
| 142 | bcopy(regs.pr_fpu.fpu_stack[5], ®isters[REGISTER_BYTE(11)], 10); |
| 143 | bcopy(regs.pr_fpu.fpu_stack[6], ®isters[REGISTER_BYTE(12)], 10); |
| 144 | bcopy(regs.pr_fpu.fpu_stack[7], ®isters[REGISTER_BYTE(13)], 10); |
| 145 | } |
| 146 | |
| 147 | \f |
| 148 | /* Work with core dump and executable files, for GDB. |
| 149 | This code would be in core.c if it weren't machine-dependent. */ |
| 150 | |
| 151 | #include "gdbcore.h" |
| 152 | |
| 153 | void |
| 154 | core_file_command (filename, from_tty) |
| 155 | char *filename; |
| 156 | int from_tty; |
| 157 | { |
| 158 | int val; |
| 159 | extern char registers[]; |
| 160 | |
| 161 | /* Discard all vestiges of any previous core file |
| 162 | and mark data and stack spaces as empty. */ |
| 163 | |
| 164 | if (corefile) |
| 165 | free (corefile); |
| 166 | corefile = 0; |
| 167 | |
| 168 | if (corechan >= 0) |
| 169 | close (corechan); |
| 170 | corechan = -1; |
| 171 | |
| 172 | data_start = 0; |
| 173 | data_end = 0; |
| 174 | stack_start = STACK_END_ADDR; |
| 175 | stack_end = STACK_END_ADDR; |
| 176 | |
| 177 | /* Now, if a new core file was specified, open it and digest it. */ |
| 178 | |
| 179 | if (filename) |
| 180 | { |
| 181 | filename = tilde_expand (filename); |
| 182 | make_cleanup (free, filename); |
| 183 | |
| 184 | if (have_inferior_p ()) |
| 185 | error ("To look at a core file, you must kill the inferior with \"kill\"."); |
| 186 | corechan = open (filename, O_RDONLY, 0); |
| 187 | if (corechan < 0) |
| 188 | perror_with_name (filename); |
| 189 | /* 4.2-style (and perhaps also sysV-style) core dump file. */ |
| 190 | { |
| 191 | struct user u; |
| 192 | int reg_offset; |
| 193 | |
| 194 | val = myread (corechan, &u, sizeof u); |
| 195 | if (val < 0) |
| 196 | perror_with_name (filename); |
| 197 | data_start = exec_data_start; |
| 198 | |
| 199 | data_end = data_start + NBPG * (u.u_dsize - u.u_tsize); |
| 200 | stack_start = stack_end - NBPG * u.u_ssize; |
| 201 | data_offset = NBPG * UPAGES; |
| 202 | stack_offset = ctob(UPAGES + u.u_dsize - u.u_tsize); |
| 203 | reg_offset = (int) u.u_ar0 - KERNEL_U_ADDR; |
| 204 | printf("u.u_tsize= %#x, u.u_dsize= %#x, u.u_ssize= %#x, stack_off= %#x\n", |
| 205 | u.u_tsize, u.u_dsize, u.u_ssize, stack_offset); |
| 206 | |
| 207 | core_aouthdr.a_magic = 0; |
| 208 | |
| 209 | /* Read the register values out of the core file and store |
| 210 | them where `read_register' will find them. */ |
| 211 | |
| 212 | { |
| 213 | register int regno; |
| 214 | |
| 215 | for (regno = 0; regno < NUM_REGS; regno++) |
| 216 | { |
| 217 | char buf[MAX_REGISTER_RAW_SIZE]; |
| 218 | |
| 219 | val = lseek (corechan, register_addr (regno, reg_offset), 0); |
| 220 | if (val < 0) |
| 221 | perror_with_name (filename); |
| 222 | |
| 223 | val = myread (corechan, buf, sizeof buf); |
| 224 | if (val < 0) |
| 225 | perror_with_name (filename); |
| 226 | supply_register (regno, buf); |
| 227 | } |
| 228 | } |
| 229 | } |
| 230 | if (filename[0] == '/') |
| 231 | corefile = savestring (filename, strlen (filename)); |
| 232 | else |
| 233 | { |
| 234 | corefile = concat (current_directory, "/", filename); |
| 235 | } |
| 236 | |
| 237 | set_current_frame(create_new_frame(read_register(FP_REGNUM), |
| 238 | read_pc())); |
| 239 | /* set_current_frame (read_register (FP_REGNUM));*/ |
| 240 | select_frame (get_current_frame (), 0); |
| 241 | validate_files (); |
| 242 | } |
| 243 | else if (from_tty) |
| 244 | printf ("No core file now.\n"); |
| 245 | } |
| 246 | |
| 247 | /* from i386-dep.c */ |
| 248 | static |
| 249 | print_387_control_word (control) |
| 250 | unsigned short control; |
| 251 | { |
| 252 | printf ("control 0x%04x: ", control); |
| 253 | printf ("compute to "); |
| 254 | switch ((control >> 8) & 3) |
| 255 | { |
| 256 | case 0: printf ("24 bits; "); break; |
| 257 | case 1: printf ("(bad); "); break; |
| 258 | case 2: printf ("53 bits; "); break; |
| 259 | case 3: printf ("64 bits; "); break; |
| 260 | } |
| 261 | printf ("round "); |
| 262 | switch ((control >> 10) & 3) |
| 263 | { |
| 264 | case 0: printf ("NEAREST; "); break; |
| 265 | case 1: printf ("DOWN; "); break; |
| 266 | case 2: printf ("UP; "); break; |
| 267 | case 3: printf ("CHOP; "); break; |
| 268 | } |
| 269 | if (control & 0x3f) |
| 270 | { |
| 271 | printf ("mask:"); |
| 272 | if (control & 0x0001) printf (" INVALID"); |
| 273 | if (control & 0x0002) printf (" DENORM"); |
| 274 | if (control & 0x0004) printf (" DIVZ"); |
| 275 | if (control & 0x0008) printf (" OVERF"); |
| 276 | if (control & 0x0010) printf (" UNDERF"); |
| 277 | if (control & 0x0020) printf (" LOS"); |
| 278 | printf (";"); |
| 279 | } |
| 280 | printf ("\n"); |
| 281 | if (control & 0xe080) printf ("warning: reserved bits on 0x%x\n", |
| 282 | control & 0xe080); |
| 283 | } |
| 284 | |
| 285 | static |
| 286 | print_387_status_word (status) |
| 287 | unsigned short status; |
| 288 | { |
| 289 | printf ("status %#04x: ", status); |
| 290 | if (status & 0xff) { |
| 291 | printf ("exceptions:"); /* exception names match <machine/fpu.h> */ |
| 292 | if (status & 0x0001) printf (" FLTINV"); |
| 293 | if (status & 0x0002) printf (" FLTDEN"); |
| 294 | if (status & 0x0004) printf (" FLTDIV"); |
| 295 | if (status & 0x0008) printf (" FLTOVF"); |
| 296 | if (status & 0x0010) printf (" FLTUND"); |
| 297 | if (status & 0x0020) printf (" FLTPRE"); |
| 298 | if (status & 0x0040) printf (" FLTSTK"); |
| 299 | printf ("; "); |
| 300 | } |
| 301 | printf ("flags: %d%d%d%d; ", |
| 302 | (status & 0x4000) != 0, |
| 303 | (status & 0x0400) != 0, |
| 304 | (status & 0x0200) != 0, |
| 305 | (status & 0x0100) != 0); |
| 306 | |
| 307 | printf ("top %d\n", (status >> 11) & 7); |
| 308 | } |
| 309 | |
| 310 | static |
| 311 | print_fpu_status(ep) |
| 312 | struct pt_regset ep; |
| 313 | |
| 314 | { |
| 315 | int i; |
| 316 | int bothstatus; |
| 317 | int top; |
| 318 | int fpreg; |
| 319 | unsigned char *p; |
| 320 | |
| 321 | printf("80387:"); |
| 322 | if (ep.pr_fpu.fpu_ip == 0) { |
| 323 | printf(" not in use.\n"); |
| 324 | return; |
| 325 | } else { |
| 326 | printf("\n"); |
| 327 | } |
| 328 | if (ep.pr_fpu.fpu_status != 0) { |
| 329 | print_387_status_word (ep.pr_fpu.fpu_status); |
| 330 | } |
| 331 | print_387_control_word (ep.pr_fpu.fpu_control); |
| 332 | printf ("last exception: "); |
| 333 | printf ("opcode 0x%x; ", ep.pr_fpu.fpu_rsvd4); |
| 334 | printf ("pc 0x%x:0x%x; ", ep.pr_fpu.fpu_cs, ep.pr_fpu.fpu_ip); |
| 335 | printf ("operand 0x%x:0x%x\n", ep.pr_fpu.fpu_data_offset, ep.pr_fpu.fpu_op_sel); |
| 336 | |
| 337 | top = (ep.pr_fpu.fpu_status >> 11) & 7; |
| 338 | |
| 339 | printf ("regno tag msb lsb value\n"); |
| 340 | for (fpreg = 7; fpreg >= 0; fpreg--) |
| 341 | { |
| 342 | double val; |
| 343 | |
| 344 | printf ("%s %d: ", fpreg == top ? "=>" : " ", fpreg); |
| 345 | |
| 346 | switch ((ep.pr_fpu.fpu_tag >> (fpreg * 2)) & 3) |
| 347 | { |
| 348 | case 0: printf ("valid "); break; |
| 349 | case 1: printf ("zero "); break; |
| 350 | case 2: printf ("trap "); break; |
| 351 | case 3: printf ("empty "); break; |
| 352 | } |
| 353 | for (i = 9; i >= 0; i--) |
| 354 | printf ("%02x", ep.pr_fpu.fpu_stack[fpreg][i]); |
| 355 | |
| 356 | i387_to_double (ep.pr_fpu.fpu_stack[fpreg], (char *)&val); |
| 357 | printf (" %g\n", val); |
| 358 | } |
| 359 | if (ep.pr_fpu.fpu_rsvd1) |
| 360 | printf ("warning: rsvd1 is 0x%x\n", ep.pr_fpu.fpu_rsvd1); |
| 361 | if (ep.pr_fpu.fpu_rsvd2) |
| 362 | printf ("warning: rsvd2 is 0x%x\n", ep.pr_fpu.fpu_rsvd2); |
| 363 | if (ep.pr_fpu.fpu_rsvd3) |
| 364 | printf ("warning: rsvd3 is 0x%x\n", ep.pr_fpu.fpu_rsvd3); |
| 365 | if (ep.pr_fpu.fpu_rsvd5) |
| 366 | printf ("warning: rsvd5 is 0x%x\n", ep.pr_fpu.fpu_rsvd5); |
| 367 | } |
| 368 | |
| 369 | |
| 370 | print_1167_control_word(pcr) |
| 371 | unsigned int pcr; |
| 372 | |
| 373 | { |
| 374 | int pcr_tmp; |
| 375 | |
| 376 | pcr_tmp = pcr & FPA_PCR_MODE; |
| 377 | printf("\tMODE= %#x; RND= %#x ", pcr_tmp, pcr_tmp & 12); |
| 378 | switch (pcr_tmp & 12) { |
| 379 | case 0: |
| 380 | printf("RN (Nearest Value)"); |
| 381 | break; |
| 382 | case 1: |
| 383 | printf("RZ (Zero)"); |
| 384 | break; |
| 385 | case 2: |
| 386 | printf("RP (Positive Infinity)"); |
| 387 | break; |
| 388 | case 3: |
| 389 | printf("RM (Negative Infinity)"); |
| 390 | break; |
| 391 | } |
| 392 | printf("; IRND= %d ", pcr_tmp & 2); |
| 393 | if (0 == pcr_tmp & 2) { |
| 394 | printf("(same as RND)\n"); |
| 395 | } else { |
| 396 | printf("(toward zero)\n"); |
| 397 | } |
| 398 | pcr_tmp = pcr & FPA_PCR_EM; |
| 399 | printf("\tEM= %#x", pcr_tmp); |
| 400 | if (pcr_tmp & FPA_PCR_EM_DM) printf(" DM"); |
| 401 | if (pcr_tmp & FPA_PCR_EM_UOM) printf(" UOM"); |
| 402 | if (pcr_tmp & FPA_PCR_EM_PM) printf(" PM"); |
| 403 | if (pcr_tmp & FPA_PCR_EM_UM) printf(" UM"); |
| 404 | if (pcr_tmp & FPA_PCR_EM_OM) printf(" OM"); |
| 405 | if (pcr_tmp & FPA_PCR_EM_ZM) printf(" ZM"); |
| 406 | if (pcr_tmp & FPA_PCR_EM_IM) printf(" IM"); |
| 407 | printf("\n"); |
| 408 | pcr_tmp = FPA_PCR_CC; |
| 409 | printf("\tCC= %#x", pcr_tmp); |
| 410 | if (pcr_tmp & FPA_PCR_20MHZ) printf(" 20MHZ"); |
| 411 | if (pcr_tmp & FPA_PCR_CC_Z) printf(" Z"); |
| 412 | if (pcr_tmp & FPA_PCR_CC_C2) printf(" C2"); |
| 413 | if (pcr_tmp & FPA_PCR_CC_C1) printf(" C1"); |
| 414 | switch (pcr_tmp) { |
| 415 | case FPA_PCR_CC_Z: |
| 416 | printf(" (Equal)"); |
| 417 | break; |
| 418 | case FPA_PCR_CC_C1: |
| 419 | printf(" (Less than)"); |
| 420 | break; |
| 421 | case 0: |
| 422 | printf(" (Greater than)"); |
| 423 | break; |
| 424 | case FPA_PCR_CC_Z | FPA_PCR_CC_C1 | FPA_PCR_CC_C2: |
| 425 | printf(" (Unordered)"); |
| 426 | break; |
| 427 | default: |
| 428 | printf(" (Undefined)"); |
| 429 | break; |
| 430 | } |
| 431 | printf("\n"); |
| 432 | pcr_tmp = pcr & FPA_PCR_AE; |
| 433 | printf("\tAE= %#x", pcr_tmp); |
| 434 | if (pcr_tmp & FPA_PCR_AE_DE) printf(" DE"); |
| 435 | if (pcr_tmp & FPA_PCR_AE_UOE) printf(" UOE"); |
| 436 | if (pcr_tmp & FPA_PCR_AE_PE) printf(" PE"); |
| 437 | if (pcr_tmp & FPA_PCR_AE_UE) printf(" UE"); |
| 438 | if (pcr_tmp & FPA_PCR_AE_OE) printf(" OE"); |
| 439 | if (pcr_tmp & FPA_PCR_AE_ZE) printf(" ZE"); |
| 440 | if (pcr_tmp & FPA_PCR_AE_EE) printf(" EE"); |
| 441 | if (pcr_tmp & FPA_PCR_AE_IE) printf(" IE"); |
| 442 | printf("\n"); |
| 443 | } |
| 444 | |
| 445 | print_1167_regs(regs) |
| 446 | long regs[FPA_NREGS]; |
| 447 | |
| 448 | { |
| 449 | int i; |
| 450 | |
| 451 | union { |
| 452 | double d; |
| 453 | long l[2]; |
| 454 | } xd; |
| 455 | union { |
| 456 | float f; |
| 457 | long l; |
| 458 | } xf; |
| 459 | |
| 460 | |
| 461 | for (i = 0; i < FPA_NREGS; i++) { |
| 462 | xf.l = regs[i]; |
| 463 | printf("%%fp%d: raw= %#x, single= %f", i+1, regs[i], xf.f); |
| 464 | if (!(i & 1)) { |
| 465 | printf("\n"); |
| 466 | } else { |
| 467 | xd.l[1] = regs[i]; |
| 468 | xd.l[0] = regs[i+1]; |
| 469 | printf(", double= %f\n", xd.d); |
| 470 | } |
| 471 | } |
| 472 | } |
| 473 | |
| 474 | print_fpa_status(ep) |
| 475 | struct pt_regset ep; |
| 476 | |
| 477 | { |
| 478 | |
| 479 | printf("WTL 1167:"); |
| 480 | if (ep.pr_fpa.fpa_pcr !=0) { |
| 481 | printf("\n"); |
| 482 | print_1167_control_word(ep.pr_fpa.fpa_pcr); |
| 483 | print_1167_regs(ep.pr_fpa.fpa_regs); |
| 484 | } else { |
| 485 | printf(" not in use.\n"); |
| 486 | } |
| 487 | } |
| 488 | |
| 489 | i386_float_info () |
| 490 | |
| 491 | { |
| 492 | char ubuf[UPAGES*NBPG]; |
| 493 | struct pt_regset regset; |
| 494 | extern int corechan; |
| 495 | |
| 496 | if (have_inferior_p()) { |
| 497 | call_ptrace(XPT_RREGS, inferior_pid, ®set, 0); |
| 498 | } else { |
| 499 | if (lseek (corechan, 0, 0) < 0) { |
| 500 | perror ("seek on core file"); |
| 501 | } |
| 502 | if (myread (corechan, ubuf, UPAGES*NBPG) < 0) { |
| 503 | perror ("read on core file"); |
| 504 | } |
| 505 | /* only interested in the floating point registers */ |
| 506 | regset.pr_fpu = ((struct user *) ubuf)->u_fpusave; |
| 507 | regset.pr_fpa = ((struct user *) ubuf)->u_fpasave; |
| 508 | } |
| 509 | print_fpu_status(regset); |
| 510 | print_fpa_status(regset); |
| 511 | } |
| 512 | |
| 513 | i387_to_double (from, to) |
| 514 | char *from; |
| 515 | char *to; |
| 516 | { |
| 517 | long *lp; |
| 518 | /* push extended mode on 387 stack, then pop in double mode |
| 519 | * |
| 520 | * first, set exception masks so no error is generated - |
| 521 | * number will be rounded to inf or 0, if necessary |
| 522 | */ |
| 523 | asm ("pushl %eax"); /* grab a stack slot */ |
| 524 | asm ("fstcw (%esp)"); /* get 387 control word */ |
| 525 | asm ("movl (%esp),%eax"); /* save old value */ |
| 526 | asm ("orl $0x3f,%eax"); /* mask all exceptions */ |
| 527 | asm ("pushl %eax"); |
| 528 | asm ("fldcw (%esp)"); /* load new value into 387 */ |
| 529 | |
| 530 | asm ("movl 8(%ebp),%eax"); |
| 531 | asm ("fldt (%eax)"); /* push extended number on 387 stack */ |
| 532 | asm ("fwait"); |
| 533 | asm ("movl 12(%ebp),%eax"); |
| 534 | asm ("fstpl (%eax)"); /* pop double */ |
| 535 | asm ("fwait"); |
| 536 | |
| 537 | asm ("popl %eax"); /* flush modified control word */ |
| 538 | asm ("fnclex"); /* clear exceptions */ |
| 539 | asm ("fldcw (%esp)"); /* restore original control word */ |
| 540 | asm ("popl %eax"); /* flush saved copy */ |
| 541 | } |
| 542 | |
| 543 | double_to_i387 (from, to) |
| 544 | char *from; |
| 545 | char *to; |
| 546 | { |
| 547 | /* push double mode on 387 stack, then pop in extended mode |
| 548 | * no errors are possible because every 64-bit pattern |
| 549 | * can be converted to an extended |
| 550 | */ |
| 551 | asm ("movl 8(%ebp),%eax"); |
| 552 | asm ("fldl (%eax)"); |
| 553 | asm ("fwait"); |
| 554 | asm ("movl 12(%ebp),%eax"); |
| 555 | asm ("fstpt (%eax)"); |
| 556 | asm ("fwait"); |
| 557 | } |