Blame view
arch/x86/math-emu/fpu_entry.c
22.2 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 |
/*---------------------------------------------------------------------------+ | fpu_entry.c | | | | The entry functions for wm-FPU-emu | | | | Copyright (C) 1992,1993,1994,1996,1997 | | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia | | E-mail billm@suburbia.net | | | | See the files "README" and "COPYING" for further copyright and warranty | | information. | | | +---------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------+ | Note: | | The file contains code which accesses user memory. | | Emulator static data may change when user memory is accessed, due to | | other processes using the emulator while swapping is in progress. | +---------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------+ | math_emulate(), restore_i387_soft() and save_i387_soft() are the only | | entry points for wm-FPU-emu. | +---------------------------------------------------------------------------*/ #include <linux/signal.h> |
ff0ebb23c x86: x86 user_reg... |
28 |
#include <linux/regset.h> |
1da177e4c Linux-2.6.12-rc2 |
29 30 31 |
#include <asm/uaccess.h> #include <asm/desc.h> |
ff0ebb23c x86: x86 user_reg... |
32 |
#include <asm/user.h> |
e8a496ac8 x86: fix broken m... |
33 |
#include <asm/i387.h> |
1da177e4c Linux-2.6.12-rc2 |
34 35 36 37 38 39 |
#include "fpu_system.h" #include "fpu_emu.h" #include "exception.h" #include "control_w.h" #include "status_w.h" |
3d0d14f98 x86: lindent arch... |
40 |
#define __BAD__ FPU_illegal /* Illegal on an 80486, causes SIGILL */ |
1da177e4c Linux-2.6.12-rc2 |
41 |
|
3d0d14f98 x86: lindent arch... |
42 |
#ifndef NO_UNDOC_CODE /* Un-documented FPU op-codes supported by default. */ |
1da177e4c Linux-2.6.12-rc2 |
43 44 45 46 47 |
/* WARNING: These codes are not documented by Intel in their 80486 manual and may not work on FPU clones or later Intel FPUs. */ /* Changes to support the un-doc codes provided by Linus Torvalds. */ |
3d0d14f98 x86: lindent arch... |
48 49 50 51 52 53 54 55 56 |
#define _d9_d8_ fstp_i /* unofficial code (19) */ #define _dc_d0_ fcom_st /* unofficial code (14) */ #define _dc_d8_ fcompst /* unofficial code (1c) */ #define _dd_c8_ fxch_i /* unofficial code (0d) */ #define _de_d0_ fcompst /* unofficial code (16) */ #define _df_c0_ ffreep /* unofficial code (07) ffree + pop */ #define _df_c8_ fxch_i /* unofficial code (0f) */ #define _df_d0_ fstp_i /* unofficial code (17) */ #define _df_d8_ fstp_i /* unofficial code (1f) */ |
1da177e4c Linux-2.6.12-rc2 |
57 58 |
static FUNC const st_instr_table[64] = { |
3d0d14f98 x86: lindent arch... |
59 60 61 62 63 64 65 66 |
fadd__, fld_i_, __BAD__, __BAD__, fadd_i, ffree_, faddp_, _df_c0_, fmul__, fxch_i, __BAD__, __BAD__, fmul_i, _dd_c8_, fmulp_, _df_c8_, fcom_st, fp_nop, __BAD__, __BAD__, _dc_d0_, fst_i_, _de_d0_, _df_d0_, fcompst, _d9_d8_, __BAD__, __BAD__, _dc_d8_, fstp_i, fcompp, _df_d8_, fsub__, FPU_etc, __BAD__, finit_, fsubri, fucom_, fsubrp, fstsw_, fsubr_, fconst, fucompp, __BAD__, fsub_i, fucomp, fsubp_, __BAD__, fdiv__, FPU_triga, __BAD__, __BAD__, fdivri, __BAD__, fdivrp, __BAD__, fdivr_, FPU_trigb, __BAD__, __BAD__, fdiv_i, __BAD__, fdivp_, __BAD__, |
1da177e4c Linux-2.6.12-rc2 |
67 |
}; |
3d0d14f98 x86: lindent arch... |
68 |
#else /* Support only documented FPU op-codes */ |
1da177e4c Linux-2.6.12-rc2 |
69 70 |
static FUNC const st_instr_table[64] = { |
3d0d14f98 x86: lindent arch... |
71 72 73 74 75 76 77 78 |
fadd__, fld_i_, __BAD__, __BAD__, fadd_i, ffree_, faddp_, __BAD__, fmul__, fxch_i, __BAD__, __BAD__, fmul_i, __BAD__, fmulp_, __BAD__, fcom_st, fp_nop, __BAD__, __BAD__, __BAD__, fst_i_, __BAD__, __BAD__, fcompst, __BAD__, __BAD__, __BAD__, __BAD__, fstp_i, fcompp, __BAD__, fsub__, FPU_etc, __BAD__, finit_, fsubri, fucom_, fsubrp, fstsw_, fsubr_, fconst, fucompp, __BAD__, fsub_i, fucomp, fsubp_, __BAD__, fdiv__, FPU_triga, __BAD__, __BAD__, fdivri, __BAD__, fdivrp, __BAD__, fdivr_, FPU_trigb, __BAD__, __BAD__, fdiv_i, __BAD__, fdivp_, __BAD__, |
1da177e4c Linux-2.6.12-rc2 |
79 80 81 |
}; #endif /* NO_UNDOC_CODE */ |
3d0d14f98 x86: lindent arch... |
82 83 84 85 86 87 88 89 90 91 |
#define _NONE_ 0 /* Take no special action */ #define _REG0_ 1 /* Need to check for not empty st(0) */ #define _REGI_ 2 /* Need to check for not empty st(0) and st(rm) */ #define _REGi_ 0 /* Uses st(rm) */ #define _PUSH_ 3 /* Need to check for space to push onto stack */ #define _null_ 4 /* Function illegal or not implemented */ #define _REGIi 5 /* Uses st(0) and st(rm), result to st(rm) */ #define _REGIp 6 /* Uses st(0) and st(rm), result to st(rm) then pop */ #define _REGIc 0 /* Compare st(0) and st(rm) */ #define _REGIn 0 /* Uses st(0) and st(rm), but handle checks later */ |
1da177e4c Linux-2.6.12-rc2 |
92 93 94 95 96 97 |
#ifndef NO_UNDOC_CODE /* Un-documented FPU op-codes supported by default. (see above) */ static u_char const type_table[64] = { |
3d0d14f98 x86: lindent arch... |
98 99 100 101 102 103 104 105 |
_REGI_, _NONE_, _null_, _null_, _REGIi, _REGi_, _REGIp, _REGi_, _REGI_, _REGIn, _null_, _null_, _REGIi, _REGI_, _REGIp, _REGI_, _REGIc, _NONE_, _null_, _null_, _REGIc, _REG0_, _REGIc, _REG0_, _REGIc, _REG0_, _null_, _null_, _REGIc, _REG0_, _REGIc, _REG0_, _REGI_, _NONE_, _null_, _NONE_, _REGIi, _REGIc, _REGIp, _NONE_, _REGI_, _NONE_, _REGIc, _null_, _REGIi, _REGIc, _REGIp, _null_, _REGI_, _NONE_, _null_, _null_, _REGIi, _null_, _REGIp, _null_, _REGI_, _NONE_, _null_, _null_, _REGIi, _null_, _REGIp, _null_ |
1da177e4c Linux-2.6.12-rc2 |
106 |
}; |
3d0d14f98 x86: lindent arch... |
107 |
#else /* Support only documented FPU op-codes */ |
1da177e4c Linux-2.6.12-rc2 |
108 109 |
static u_char const type_table[64] = { |
3d0d14f98 x86: lindent arch... |
110 111 112 113 114 115 116 117 |
_REGI_, _NONE_, _null_, _null_, _REGIi, _REGi_, _REGIp, _null_, _REGI_, _REGIn, _null_, _null_, _REGIi, _null_, _REGIp, _null_, _REGIc, _NONE_, _null_, _null_, _null_, _REG0_, _null_, _null_, _REGIc, _null_, _null_, _null_, _null_, _REG0_, _REGIc, _null_, _REGI_, _NONE_, _null_, _NONE_, _REGIi, _REGIc, _REGIp, _NONE_, _REGI_, _NONE_, _REGIc, _null_, _REGIi, _REGIc, _REGIp, _null_, _REGI_, _NONE_, _null_, _null_, _REGIi, _null_, _REGIp, _null_, _REGI_, _NONE_, _null_, _null_, _REGIi, _null_, _REGIp, _null_ |
1da177e4c Linux-2.6.12-rc2 |
118 119 120 |
}; #endif /* NO_UNDOC_CODE */ |
1da177e4c Linux-2.6.12-rc2 |
121 |
#ifdef RE_ENTRANT_CHECKING |
3d0d14f98 x86: lindent arch... |
122 |
u_char emulating = 0; |
1da177e4c Linux-2.6.12-rc2 |
123 |
#endif /* RE_ENTRANT_CHECKING */ |
e8d591dc7 x86: lindent arch... |
124 |
static int valid_prefix(u_char *Byte, u_char __user ** fpu_eip, |
3d0d14f98 x86: lindent arch... |
125 |
overrides * override); |
1da177e4c Linux-2.6.12-rc2 |
126 |
|
d315760ff x86: fix math_emu... |
127 |
void math_emulate(struct math_emu_info *info) |
1da177e4c Linux-2.6.12-rc2 |
128 |
{ |
3d0d14f98 x86: lindent arch... |
129 130 131 132 133 134 135 136 137 138 139 140 141 |
u_char FPU_modrm, byte1; unsigned short code; fpu_addr_modes addr_modes; int unmasked; FPU_REG loaded_data; FPU_REG *st0_ptr; u_char loaded_tag, st0_tag; void __user *data_address; struct address data_sel_off; struct address entry_sel_off; unsigned long code_base = 0; unsigned long code_limit = 0; /* Initialized to stop compiler warnings */ struct desc_struct code_descriptor; |
1da177e4c Linux-2.6.12-rc2 |
142 |
|
e8a496ac8 x86: fix broken m... |
143 144 145 146 147 148 |
if (!used_math()) { if (init_fpu(current)) { do_group_exit(SIGKILL); return; } } |
1da177e4c Linux-2.6.12-rc2 |
149 |
#ifdef RE_ENTRANT_CHECKING |
3d0d14f98 x86: lindent arch... |
150 151 152 153 154 |
if (emulating) { printk("ERROR: wm-FPU-emu is not RE-ENTRANT! "); } RE_ENTRANT_CHECK_ON; |
1da177e4c Linux-2.6.12-rc2 |
155 |
#endif /* RE_ENTRANT_CHECKING */ |
d315760ff x86: fix math_emu... |
156 |
FPU_info = info; |
3d0d14f98 x86: lindent arch... |
157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 |
FPU_ORIG_EIP = FPU_EIP; if ((FPU_EFLAGS & 0x00020000) != 0) { /* Virtual 8086 mode */ addr_modes.default_mode = VM86; FPU_EIP += code_base = FPU_CS << 4; code_limit = code_base + 0xffff; /* Assumes code_base <= 0xffff0000 */ } else if (FPU_CS == __USER_CS && FPU_DS == __USER_DS) { addr_modes.default_mode = 0; } else if (FPU_CS == __KERNEL_CS) { printk("math_emulate: %04x:%08lx ", FPU_CS, FPU_EIP); panic("Math emulation needed in kernel"); } else { if ((FPU_CS & 4) != 4) { /* Must be in the LDT */ /* Can only handle segmented addressing via the LDT for now, and it must be 16 bit */ printk("FPU emulator: Unsupported addressing mode "); math_abort(FPU_info, SIGILL); } code_descriptor = LDT_DESCRIPTOR(FPU_CS); if (SEG_D_SIZE(code_descriptor)) { /* The above test may be wrong, the book is not clear */ /* Segmented 32 bit protected mode */ addr_modes.default_mode = SEG32; } else { /* 16 bit protected mode */ addr_modes.default_mode = PM16; } FPU_EIP += code_base = SEG_BASE_ADDR(code_descriptor); code_limit = code_base + (SEG_LIMIT(code_descriptor) + 1) * SEG_GRANULARITY(code_descriptor) - 1; if (code_limit < code_base) code_limit = 0xffffffff; |
1da177e4c Linux-2.6.12-rc2 |
197 |
} |
3d0d14f98 x86: lindent arch... |
198 |
|
ff0ebb23c x86: x86 user_reg... |
199 |
FPU_lookahead = !(FPU_EFLAGS & X86_EFLAGS_TF); |
3d0d14f98 x86: lindent arch... |
200 201 202 203 204 205 206 207 208 209 210 211 212 |
if (!valid_prefix(&byte1, (u_char __user **) & FPU_EIP, &addr_modes.override)) { RE_ENTRANT_CHECK_OFF; printk ("FPU emulator: Unknown prefix byte 0x%02x, probably due to " "FPU emulator: self-modifying code! (emulation impossible) ", byte1); RE_ENTRANT_CHECK_ON; EXCEPTION(EX_INTERNAL | 0x126); math_abort(FPU_info, SIGILL); |
1da177e4c Linux-2.6.12-rc2 |
213 |
} |
3d0d14f98 x86: lindent arch... |
214 215 216 217 218 219 220 221 222 223 224 225 |
do_another_FPU_instruction: no_ip_update = 0; FPU_EIP++; /* We have fetched the prefix and first code bytes. */ if (addr_modes.default_mode) { /* This checks for the minimum instruction bytes. We also need to check any extra (address mode) code access. */ if (FPU_EIP > code_limit) math_abort(FPU_info, SIGSEGV); |
1da177e4c Linux-2.6.12-rc2 |
226 |
} |
3d0d14f98 x86: lindent arch... |
227 228 229 230 231 232 233 234 |
if ((byte1 & 0xf8) != 0xd8) { if (byte1 == FWAIT_OPCODE) { if (partial_status & SW_Summary) goto do_the_FPU_interrupt; else goto FPU_fwait_done; } |
1da177e4c Linux-2.6.12-rc2 |
235 |
#ifdef PARANOID |
3d0d14f98 x86: lindent arch... |
236 237 |
EXCEPTION(EX_INTERNAL | 0x128); math_abort(FPU_info, SIGILL); |
1da177e4c Linux-2.6.12-rc2 |
238 |
#endif /* PARANOID */ |
1da177e4c Linux-2.6.12-rc2 |
239 |
} |
3d0d14f98 x86: lindent arch... |
240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 |
RE_ENTRANT_CHECK_OFF; FPU_code_access_ok(1); FPU_get_user(FPU_modrm, (u_char __user *) FPU_EIP); RE_ENTRANT_CHECK_ON; FPU_EIP++; if (partial_status & SW_Summary) { /* Ignore the error for now if the current instruction is a no-wait control instruction */ /* The 80486 manual contradicts itself on this topic, but a real 80486 uses the following instructions: fninit, fnstenv, fnsave, fnstsw, fnstenv, fnclex. */ code = (FPU_modrm << 8) | byte1; if (!((((code & 0xf803) == 0xe003) || /* fnclex, fninit, fnstsw */ (((code & 0x3003) == 0x3001) && /* fnsave, fnstcw, fnstenv, fnstsw */ ((code & 0xc000) != 0xc000))))) { /* * We need to simulate the action of the kernel to FPU * interrupts here. */ do_the_FPU_interrupt: FPU_EIP = FPU_ORIG_EIP; /* Point to current FPU instruction. */ RE_ENTRANT_CHECK_OFF; current->thread.trap_no = 16; current->thread.error_code = 0; send_sig(SIGFPE, current, 1); return; |
1da177e4c Linux-2.6.12-rc2 |
271 |
} |
3d0d14f98 x86: lindent arch... |
272 |
} |
1da177e4c Linux-2.6.12-rc2 |
273 |
|
3d0d14f98 x86: lindent arch... |
274 275 276 |
entry_sel_off.offset = FPU_ORIG_EIP; entry_sel_off.selector = FPU_CS; entry_sel_off.opcode = (byte1 << 8) | FPU_modrm; |
cc7594e42 i386: arch/x86/ma... |
277 |
entry_sel_off.empty = 0; |
1da177e4c Linux-2.6.12-rc2 |
278 |
|
3d0d14f98 x86: lindent arch... |
279 |
FPU_rm = FPU_modrm & 7; |
1da177e4c Linux-2.6.12-rc2 |
280 |
|
3d0d14f98 x86: lindent arch... |
281 282 |
if (FPU_modrm < 0300) { /* All of these instructions use the mod/rm byte to get a data address */ |
1da177e4c Linux-2.6.12-rc2 |
283 |
|
3d0d14f98 x86: lindent arch... |
284 285 286 287 288 289 290 291 292 293 294 295 296 |
if ((addr_modes.default_mode & SIXTEEN) ^ (addr_modes.override.address_size == ADDR_SIZE_PREFIX)) data_address = FPU_get_address_16(FPU_modrm, &FPU_EIP, &data_sel_off, addr_modes); else data_address = FPU_get_address(FPU_modrm, &FPU_EIP, &data_sel_off, addr_modes); if (addr_modes.default_mode) { if (FPU_EIP - 1 > code_limit) math_abort(FPU_info, SIGSEGV); |
1da177e4c Linux-2.6.12-rc2 |
297 |
} |
3d0d14f98 x86: lindent arch... |
298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 |
if (!(byte1 & 1)) { unsigned short status1 = partial_status; st0_ptr = &st(0); st0_tag = FPU_gettag0(); /* Stack underflow has priority */ if (NOT_EMPTY_ST0) { if (addr_modes.default_mode & PROTECTED) { /* This table works for 16 and 32 bit protected mode */ if (access_limit < data_sizes_16[(byte1 >> 1) & 3]) math_abort(FPU_info, SIGSEGV); } unmasked = 0; /* Do this here to stop compiler warnings. */ switch ((byte1 >> 1) & 3) { case 0: unmasked = FPU_load_single((float __user *) data_address, &loaded_data); loaded_tag = unmasked & 0xff; unmasked &= ~0xff; break; case 1: loaded_tag = FPU_load_int32((long __user *) data_address, &loaded_data); break; case 2: unmasked = FPU_load_double((double __user *) data_address, &loaded_data); loaded_tag = unmasked & 0xff; unmasked &= ~0xff; break; case 3: default: /* Used here to suppress gcc warnings. */ loaded_tag = FPU_load_int16((short __user *) data_address, &loaded_data); break; } /* No more access to user memory, it is safe to use static data now */ /* NaN operands have the next priority. */ /* We have to delay looking at st(0) until after loading the data, because that data might contain an SNaN */ if (((st0_tag == TAG_Special) && isNaN(st0_ptr)) || ((loaded_tag == TAG_Special) && isNaN(&loaded_data))) { /* Restore the status word; we might have loaded a denormal. */ partial_status = status1; if ((FPU_modrm & 0x30) == 0x10) { /* fcom or fcomp */ EXCEPTION(EX_Invalid); setcc(SW_C3 | SW_C2 | SW_C0); if ((FPU_modrm & 0x08) && (control_word & CW_Invalid)) FPU_pop(); /* fcomp, masked, so we pop. */ } else { if (loaded_tag == TAG_Special) loaded_tag = FPU_Special (&loaded_data); #ifdef PECULIAR_486 /* This is not really needed, but gives behaviour identical to an 80486 */ if ((FPU_modrm & 0x28) == 0x20) /* fdiv or fsub */ real_2op_NaN (&loaded_data, loaded_tag, 0, &loaded_data); else #endif /* PECULIAR_486 */ /* fadd, fdivr, fmul, or fsubr */ real_2op_NaN (&loaded_data, loaded_tag, 0, st0_ptr); } goto reg_mem_instr_done; } if (unmasked && !((FPU_modrm & 0x30) == 0x10)) { /* Is not a comparison instruction. */ if ((FPU_modrm & 0x38) == 0x38) { /* fdivr */ if ((st0_tag == TAG_Zero) && ((loaded_tag == TAG_Valid) || (loaded_tag == TAG_Special && isdenormal (&loaded_data)))) { if (FPU_divide_by_zero (0, getsign (&loaded_data)) < 0) { /* We use the fact here that the unmasked exception in the loaded data was for a denormal operand */ /* Restore the state of the denormal op bit */ partial_status &= ~SW_Denorm_Op; partial_status |= status1 & SW_Denorm_Op; } else setsign(st0_ptr, getsign (&loaded_data)); } } goto reg_mem_instr_done; } switch ((FPU_modrm >> 3) & 7) { case 0: /* fadd */ clear_C1(); FPU_add(&loaded_data, loaded_tag, 0, control_word); break; case 1: /* fmul */ clear_C1(); FPU_mul(&loaded_data, loaded_tag, 0, control_word); break; case 2: /* fcom */ FPU_compare_st_data(&loaded_data, loaded_tag); break; case 3: /* fcomp */ if (!FPU_compare_st_data (&loaded_data, loaded_tag) && !unmasked) FPU_pop(); break; case 4: /* fsub */ clear_C1(); FPU_sub(LOADED | loaded_tag, (int)&loaded_data, control_word); break; case 5: /* fsubr */ clear_C1(); FPU_sub(REV | LOADED | loaded_tag, (int)&loaded_data, control_word); break; case 6: /* fdiv */ clear_C1(); FPU_div(LOADED | loaded_tag, (int)&loaded_data, control_word); break; case 7: /* fdivr */ clear_C1(); if (st0_tag == TAG_Zero) partial_status = status1; /* Undo any denorm tag, zero-divide has priority. */ FPU_div(REV | LOADED | loaded_tag, (int)&loaded_data, control_word); break; } } else { if ((FPU_modrm & 0x30) == 0x10) { /* The instruction is fcom or fcomp */ EXCEPTION(EX_StackUnder); setcc(SW_C3 | SW_C2 | SW_C0); if ((FPU_modrm & 0x08) && (control_word & CW_Invalid)) FPU_pop(); /* fcomp */ } else FPU_stack_underflow(); } reg_mem_instr_done: operand_address = data_sel_off; } else { if (!(no_ip_update = FPU_load_store(((FPU_modrm & 0x38) | (byte1 & 6)) >> 1, addr_modes, data_address))) { operand_address = data_sel_off; } |
1da177e4c Linux-2.6.12-rc2 |
496 |
} |
1da177e4c Linux-2.6.12-rc2 |
497 |
|
3d0d14f98 x86: lindent arch... |
498 499 500 |
} else { /* None of these instructions access user memory */ u_char instr_index = (FPU_modrm & 0x38) | (byte1 & 7); |
1da177e4c Linux-2.6.12-rc2 |
501 502 |
#ifdef PECULIAR_486 |
3d0d14f98 x86: lindent arch... |
503 504 505 506 |
/* This is supposed to be undefined, but a real 80486 seems to do this: */ operand_address.offset = 0; operand_address.selector = FPU_DS; |
1da177e4c Linux-2.6.12-rc2 |
507 |
#endif /* PECULIAR_486 */ |
3d0d14f98 x86: lindent arch... |
508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 |
st0_ptr = &st(0); st0_tag = FPU_gettag0(); switch (type_table[(int)instr_index]) { case _NONE_: /* also _REGIc: _REGIn */ break; case _REG0_: if (!NOT_EMPTY_ST0) { FPU_stack_underflow(); goto FPU_instruction_done; } break; case _REGIi: if (!NOT_EMPTY_ST0 || !NOT_EMPTY(FPU_rm)) { FPU_stack_underflow_i(FPU_rm); goto FPU_instruction_done; } break; case _REGIp: if (!NOT_EMPTY_ST0 || !NOT_EMPTY(FPU_rm)) { FPU_stack_underflow_pop(FPU_rm); goto FPU_instruction_done; } break; case _REGI_: if (!NOT_EMPTY_ST0 || !NOT_EMPTY(FPU_rm)) { FPU_stack_underflow(); goto FPU_instruction_done; } break; case _PUSH_: /* Only used by the fld st(i) instruction */ break; case _null_: FPU_illegal(); goto FPU_instruction_done; default: EXCEPTION(EX_INTERNAL | 0x111); goto FPU_instruction_done; } (*st_instr_table[(int)instr_index]) (); |
1da177e4c Linux-2.6.12-rc2 |
547 |
|
3d0d14f98 x86: lindent arch... |
548 549 550 |
FPU_instruction_done: ; } |
1da177e4c Linux-2.6.12-rc2 |
551 |
|
3d0d14f98 x86: lindent arch... |
552 553 |
if (!no_ip_update) instruction_address = entry_sel_off; |
1da177e4c Linux-2.6.12-rc2 |
554 |
|
3d0d14f98 x86: lindent arch... |
555 |
FPU_fwait_done: |
1da177e4c Linux-2.6.12-rc2 |
556 557 |
#ifdef DEBUG |
3d0d14f98 x86: lindent arch... |
558 559 560 |
RE_ENTRANT_CHECK_OFF; FPU_printall(); RE_ENTRANT_CHECK_ON; |
1da177e4c Linux-2.6.12-rc2 |
561 |
#endif /* DEBUG */ |
3d0d14f98 x86: lindent arch... |
562 563 564 565 566 567 |
if (FPU_lookahead && !need_resched()) { FPU_ORIG_EIP = FPU_EIP - code_base; if (valid_prefix(&byte1, (u_char __user **) & FPU_EIP, &addr_modes.override)) goto do_another_FPU_instruction; } |
1da177e4c Linux-2.6.12-rc2 |
568 |
|
3d0d14f98 x86: lindent arch... |
569 570 |
if (addr_modes.default_mode) FPU_EIP -= code_base; |
1da177e4c Linux-2.6.12-rc2 |
571 |
|
3d0d14f98 x86: lindent arch... |
572 |
RE_ENTRANT_CHECK_OFF; |
1da177e4c Linux-2.6.12-rc2 |
573 |
} |
1da177e4c Linux-2.6.12-rc2 |
574 575 576 577 |
/* Support for prefix bytes is not yet complete. To properly handle all prefix bytes, further changes are needed in the emulator code which accesses user address space. Access to separate segments is important for msdos emulation. */ |
e8d591dc7 x86: lindent arch... |
578 |
static int valid_prefix(u_char *Byte, u_char __user **fpu_eip, |
3d0d14f98 x86: lindent arch... |
579 |
overrides * override) |
1da177e4c Linux-2.6.12-rc2 |
580 |
{ |
3d0d14f98 x86: lindent arch... |
581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 |
u_char byte; u_char __user *ip = *fpu_eip; *override = (overrides) { 0, 0, PREFIX_DEFAULT}; /* defaults */ RE_ENTRANT_CHECK_OFF; FPU_code_access_ok(1); FPU_get_user(byte, ip); RE_ENTRANT_CHECK_ON; while (1) { switch (byte) { case ADDR_SIZE_PREFIX: override->address_size = ADDR_SIZE_PREFIX; goto do_next_byte; case OP_SIZE_PREFIX: override->operand_size = OP_SIZE_PREFIX; goto do_next_byte; case PREFIX_CS: override->segment = PREFIX_CS_; goto do_next_byte; case PREFIX_ES: override->segment = PREFIX_ES_; goto do_next_byte; case PREFIX_SS: override->segment = PREFIX_SS_; goto do_next_byte; case PREFIX_FS: override->segment = PREFIX_FS_; goto do_next_byte; case PREFIX_GS: override->segment = PREFIX_GS_; goto do_next_byte; case PREFIX_DS: override->segment = PREFIX_DS_; goto do_next_byte; |
1da177e4c Linux-2.6.12-rc2 |
620 621 622 623 |
/* lock is not a valid prefix for FPU instructions, let the cpu handle it to generate a SIGILL. */ /* case PREFIX_LOCK: */ |
3d0d14f98 x86: lindent arch... |
624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 |
/* rep.. prefixes have no meaning for FPU instructions */ case PREFIX_REPE: case PREFIX_REPNE: do_next_byte: ip++; RE_ENTRANT_CHECK_OFF; FPU_code_access_ok(1); FPU_get_user(byte, ip); RE_ENTRANT_CHECK_ON; break; case FWAIT_OPCODE: *Byte = byte; return 1; default: if ((byte & 0xf8) == 0xd8) { *Byte = byte; *fpu_eip = ip; return 1; } else { /* Not a valid sequence of prefix bytes followed by an FPU instruction. */ *Byte = byte; /* Needed for error message. */ return 0; } } |
1da177e4c Linux-2.6.12-rc2 |
650 |
} |
1da177e4c Linux-2.6.12-rc2 |
651 |
} |
ae6af41f5 x86: math_emu inf... |
652 |
void math_abort(struct math_emu_info *info, unsigned int signal) |
1da177e4c Linux-2.6.12-rc2 |
653 654 655 656 |
{ FPU_EIP = FPU_ORIG_EIP; current->thread.trap_no = 16; current->thread.error_code = 0; |
3d0d14f98 x86: lindent arch... |
657 |
send_sig(signal, current, 1); |
1da177e4c Linux-2.6.12-rc2 |
658 |
RE_ENTRANT_CHECK_OFF; |
3d0d14f98 x86: lindent arch... |
659 |
__asm__("movl %0,%%esp ; ret": :"g"(((long)info) - 4)); |
1da177e4c Linux-2.6.12-rc2 |
660 |
#ifdef PARANOID |
3d0d14f98 x86: lindent arch... |
661 662 |
printk("ERROR: wm-FPU-emu math_abort failed! "); |
1da177e4c Linux-2.6.12-rc2 |
663 664 |
#endif /* PARANOID */ } |
1da177e4c Linux-2.6.12-rc2 |
665 666 667 |
#define S387 ((struct i387_soft_struct *)s387) #define sstatus_word() \ ((S387->swd & ~SW_Top & 0xffff) | ((S387->ftop << SW_Top_Shift) & SW_Top)) |
ff0ebb23c x86: x86 user_reg... |
668 669 670 671 |
int fpregs_soft_set(struct task_struct *target, const struct user_regset *regset, unsigned int pos, unsigned int count, const void *kbuf, const void __user *ubuf) |
1da177e4c Linux-2.6.12-rc2 |
672 |
{ |
c3f8978ea x86, fpu: Unbreak... |
673 |
struct i387_soft_struct *s387 = &target->thread.fpu.state->soft; |
ff0ebb23c x86: x86 user_reg... |
674 675 |
void *space = s387->st_space; int ret; |
3d0d14f98 x86: lindent arch... |
676 677 678 |
int offset, other, i, tags, regnr, tag, newtop; RE_ENTRANT_CHECK_OFF; |
ff0ebb23c x86: x86 user_reg... |
679 680 |
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, s387, 0, offsetof(struct i387_soft_struct, st_space)); |
3d0d14f98 x86: lindent arch... |
681 |
RE_ENTRANT_CHECK_ON; |
ff0ebb23c x86: x86 user_reg... |
682 683 |
if (ret) return ret; |
3d0d14f98 x86: lindent arch... |
684 685 686 687 688 689 |
S387->ftop = (S387->swd >> SW_Top_Shift) & 7; offset = (S387->ftop & 7) * 10; other = 80 - offset; RE_ENTRANT_CHECK_OFF; |
ff0ebb23c x86: x86 user_reg... |
690 |
|
3d0d14f98 x86: lindent arch... |
691 |
/* Copy all registers in stack order. */ |
ff0ebb23c x86: x86 user_reg... |
692 693 694 695 696 |
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, space + offset, 0, other); if (!ret && offset) ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, space, 0, offset); |
3d0d14f98 x86: lindent arch... |
697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 |
RE_ENTRANT_CHECK_ON; /* The tags may need to be corrected now. */ tags = S387->twd; newtop = S387->ftop; for (i = 0; i < 8; i++) { regnr = (i + newtop) & 7; if (((tags >> ((regnr & 7) * 2)) & 3) != TAG_Empty) { /* The loaded data over-rides all other cases. */ tag = FPU_tagof((FPU_REG *) ((u_char *) S387->st_space + 10 * regnr)); tags &= ~(3 << (regnr * 2)); tags |= (tag & 3) << (regnr * 2); } |
1da177e4c Linux-2.6.12-rc2 |
712 |
} |
3d0d14f98 x86: lindent arch... |
713 |
S387->twd = tags; |
1da177e4c Linux-2.6.12-rc2 |
714 |
|
ff0ebb23c x86: x86 user_reg... |
715 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
716 |
} |
ff0ebb23c x86: x86 user_reg... |
717 718 719 720 |
int fpregs_soft_get(struct task_struct *target, const struct user_regset *regset, unsigned int pos, unsigned int count, void *kbuf, void __user *ubuf) |
1da177e4c Linux-2.6.12-rc2 |
721 |
{ |
c3f8978ea x86, fpu: Unbreak... |
722 |
struct i387_soft_struct *s387 = &target->thread.fpu.state->soft; |
ff0ebb23c x86: x86 user_reg... |
723 724 |
const void *space = s387->st_space; int ret; |
3d0d14f98 x86: lindent arch... |
725 |
int offset = (S387->ftop & 7) * 10, other = 80 - offset; |
1da177e4c Linux-2.6.12-rc2 |
726 |
|
3d0d14f98 x86: lindent arch... |
727 |
RE_ENTRANT_CHECK_OFF; |
ff0ebb23c x86: x86 user_reg... |
728 |
|
1da177e4c Linux-2.6.12-rc2 |
729 |
#ifdef PECULIAR_486 |
3d0d14f98 x86: lindent arch... |
730 731 732 733 734 735 736 |
S387->cwd &= ~0xe080; /* An 80486 sets nearly all of the reserved bits to 1. */ S387->cwd |= 0xffff0040; S387->swd = sstatus_word() | 0xffff0000; S387->twd |= 0xffff0000; S387->fcs &= ~0xf8000000; S387->fos |= 0xffff0000; |
1da177e4c Linux-2.6.12-rc2 |
737 |
#endif /* PECULIAR_486 */ |
3d0d14f98 x86: lindent arch... |
738 |
|
ff0ebb23c x86: x86 user_reg... |
739 740 |
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, s387, 0, offsetof(struct i387_soft_struct, st_space)); |
3d0d14f98 x86: lindent arch... |
741 |
|
3d0d14f98 x86: lindent arch... |
742 |
/* Copy all registers in stack order. */ |
ff0ebb23c x86: x86 user_reg... |
743 744 745 746 747 748 |
if (!ret) ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, space + offset, 0, other); if (!ret) ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, space, 0, offset); |
3d0d14f98 x86: lindent arch... |
749 |
RE_ENTRANT_CHECK_ON; |
ff0ebb23c x86: x86 user_reg... |
750 751 |
return ret; } |