repositories / deb_xorg-server.git / blame
| Commit | Line | Data |
|---|---|---|
| a09e091a JB |
1 | /**************************************************************************** |
| 2 | * | |
| 3 | * Realmode X86 Emulator Library | |
| 4 | * | |
| 5 | * Copyright (C) 1996-1999 SciTech Software, Inc. | |
| 6 | * Copyright (C) David Mosberger-Tang | |
| 7 | * Copyright (C) 1999 Egbert Eich | |
| 8 | * | |
| 9 | * ======================================================================== | |
| 10 | * | |
| 11 | * Permission to use, copy, modify, distribute, and sell this software and | |
| 12 | * its documentation for any purpose is hereby granted without fee, | |
| 13 | * provided that the above copyright notice appear in all copies and that | |
| 14 | * both that copyright notice and this permission notice appear in | |
| 15 | * supporting documentation, and that the name of the authors not be used | |
| 16 | * in advertising or publicity pertaining to distribution of the software | |
| 17 | * without specific, written prior permission. The authors makes no | |
| 18 | * representations about the suitability of this software for any purpose. | |
| 19 | * It is provided "as is" without express or implied warranty. | |
| 20 | * | |
| 21 | * THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, | |
| 22 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO | |
| 23 | * EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR | |
| 24 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF | |
| 25 | * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR | |
| 26 | * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR | |
| 27 | * PERFORMANCE OF THIS SOFTWARE. | |
| 28 | * | |
| 29 | * ======================================================================== | |
| 30 | * | |
| 31 | * Language: ANSI C | |
| 32 | * Environment: Any | |
| 33 | * Developer: Kendall Bennett | |
| 34 | * | |
| 35 | * Description: This file includes subroutines which are related to | |
| 36 | * instruction decoding and accessess of immediate data via IP. etc. | |
| 37 | * | |
| 38 | ****************************************************************************/ | |
| 39 | ||
| 40 | #include <stdlib.h> | |
| 41 | ||
| 42 | #if defined(__sun) && defined(CS) /* avoid conflicts with Solaris sys/regset.h */ | |
| 43 | # undef CS | |
| 44 | # undef DS | |
| 45 | # undef SS | |
| 46 | # undef ES | |
| 47 | # undef FS | |
| 48 | # undef GS | |
| 49 | #endif | |
| 50 | ||
| 51 | #include "x86emu/x86emui.h" | |
| 52 | ||
| 53 | /*----------------------------- Implementation ----------------------------*/ | |
| 54 | ||
| 55 | /**************************************************************************** | |
| 56 | REMARKS: | |
| 57 | Handles any pending asychronous interrupts. | |
| 58 | ****************************************************************************/ | |
| 59 | static void | |
| 60 | x86emu_intr_handle(void) | |
| 61 | { | |
| 62 | u8 intno; | |
| 63 | ||
| 64 | if (M.x86.intr & INTR_SYNCH) { | |
| 65 | intno = M.x86.intno; | |
| 66 | if (_X86EMU_intrTab[intno]) { | |
| 67 | (*_X86EMU_intrTab[intno]) (intno); | |
| 68 | } | |
| 69 | else { | |
| 70 | push_word((u16) M.x86.R_FLG); | |
| 71 | CLEAR_FLAG(F_IF); | |
| 72 | CLEAR_FLAG(F_TF); | |
| 73 | push_word(M.x86.R_CS); | |
| 74 | M.x86.R_CS = mem_access_word(intno * 4 + 2); | |
| 75 | push_word(M.x86.R_IP); | |
| 76 | M.x86.R_IP = mem_access_word(intno * 4); | |
| 77 | M.x86.intr = 0; | |
| 78 | } | |
| 79 | } | |
| 80 | } | |
| 81 | ||
| 82 | /**************************************************************************** | |
| 83 | PARAMETERS: | |
| 84 | intrnum - Interrupt number to raise | |
| 85 | ||
| 86 | REMARKS: | |
| 87 | Raise the specified interrupt to be handled before the execution of the | |
| 88 | next instruction. | |
| 89 | ****************************************************************************/ | |
| 90 | void | |
| 91 | x86emu_intr_raise(u8 intrnum) | |
| 92 | { | |
| 93 | M.x86.intno = intrnum; | |
| 94 | M.x86.intr |= INTR_SYNCH; | |
| 95 | } | |
| 96 | ||
| 97 | /**************************************************************************** | |
| 98 | REMARKS: | |
| 99 | Main execution loop for the emulator. We return from here when the system | |
| 100 | halts, which is normally caused by a stack fault when we return from the | |
| 101 | original real mode call. | |
| 102 | ****************************************************************************/ | |
| 103 | void | |
| 104 | X86EMU_exec(void) | |
| 105 | { | |
| 106 | u8 op1; | |
| 107 | ||
| 108 | M.x86.intr = 0; | |
| 109 | DB(x86emu_end_instr(); | |
| 110 | ) | |
| 111 | ||
| 112 | for (;;) { | |
| 113 | DB(if (CHECK_IP_FETCH()) | |
| 114 | x86emu_check_ip_access();) | |
| 115 | /* If debugging, save the IP and CS values. */ | |
| 116 | SAVE_IP_CS(M.x86.R_CS, M.x86.R_IP); | |
| 117 | INC_DECODED_INST_LEN(1); | |
| 118 | if (M.x86.intr) { | |
| 119 | if (M.x86.intr & INTR_HALTED) { | |
| 120 | DB(if (M.x86.R_SP != 0) { | |
| 121 | printk("halted\n"); X86EMU_trace_regs();} | |
| 122 | else { | |
| 123 | if (M.x86.debug) | |
| 124 | printk("Service completed successfully\n");} | |
| 125 | ) | |
| 126 | return; | |
| 127 | } | |
| 128 | if (((M.x86.intr & INTR_SYNCH) && | |
| 129 | (M.x86.intno == 0 || M.x86.intno == 2)) || | |
| 130 | !ACCESS_FLAG(F_IF)) { | |
| 131 | x86emu_intr_handle(); | |
| 132 | } | |
| 133 | } | |
| 134 | op1 = (*sys_rdb) (((u32) M.x86.R_CS << 4) + (M.x86.R_IP++)); | |
| 135 | (*x86emu_optab[op1]) (op1); | |
| 136 | if (M.x86.debug & DEBUG_EXIT) { | |
| 137 | M.x86.debug &= ~DEBUG_EXIT; | |
| 138 | return; | |
| 139 | } | |
| 140 | } | |
| 141 | } | |
| 142 | ||
| 143 | /**************************************************************************** | |
| 144 | REMARKS: | |
| 145 | Halts the system by setting the halted system flag. | |
| 146 | ****************************************************************************/ | |
| 147 | void | |
| 148 | X86EMU_halt_sys(void) | |
| 149 | { | |
| 150 | M.x86.intr |= INTR_HALTED; | |
| 151 | } | |
| 152 | ||
| 153 | /**************************************************************************** | |
| 154 | PARAMETERS: | |
| 155 | mod - Mod value from decoded byte | |
| 156 | regh - Reg h value from decoded byte | |
| 157 | regl - Reg l value from decoded byte | |
| 158 | ||
| 159 | REMARKS: | |
| 160 | Raise the specified interrupt to be handled before the execution of the | |
| 161 | next instruction. | |
| 162 | ||
| 163 | NOTE: Do not inline this function, as (*sys_rdb) is already inline! | |
| 164 | ****************************************************************************/ | |
| 165 | void | |
| 166 | fetch_decode_modrm(int *mod, int *regh, int *regl) | |
| 167 | { | |
| 168 | int fetched; | |
| 169 | ||
| 170 | DB(if (CHECK_IP_FETCH()) | |
| 171 | x86emu_check_ip_access();) | |
| 172 | fetched = (*sys_rdb) (((u32) M.x86.R_CS << 4) + (M.x86.R_IP++)); | |
| 173 | INC_DECODED_INST_LEN(1); | |
| 174 | *mod = (fetched >> 6) & 0x03; | |
| 175 | *regh = (fetched >> 3) & 0x07; | |
| 176 | *regl = (fetched >> 0) & 0x07; | |
| 177 | } | |
| 178 | ||
| 179 | /**************************************************************************** | |
| 180 | RETURNS: | |
| 181 | Immediate byte value read from instruction queue | |
| 182 | ||
| 183 | REMARKS: | |
| 184 | This function returns the immediate byte from the instruction queue, and | |
| 185 | moves the instruction pointer to the next value. | |
| 186 | ||
| 187 | NOTE: Do not inline this function, as (*sys_rdb) is already inline! | |
| 188 | ****************************************************************************/ | |
| 189 | u8 | |
| 190 | fetch_byte_imm(void) | |
| 191 | { | |
| 192 | u8 fetched; | |
| 193 | ||
| 194 | DB(if (CHECK_IP_FETCH()) | |
| 195 | x86emu_check_ip_access();) | |
| 196 | fetched = (*sys_rdb) (((u32) M.x86.R_CS << 4) + (M.x86.R_IP++)); | |
| 197 | INC_DECODED_INST_LEN(1); | |
| 198 | return fetched; | |
| 199 | } | |
| 200 | ||
| 201 | /**************************************************************************** | |
| 202 | RETURNS: | |
| 203 | Immediate word value read from instruction queue | |
| 204 | ||
| 205 | REMARKS: | |
| 206 | This function returns the immediate byte from the instruction queue, and | |
| 207 | moves the instruction pointer to the next value. | |
| 208 | ||
| 209 | NOTE: Do not inline this function, as (*sys_rdw) is already inline! | |
| 210 | ****************************************************************************/ | |
| 211 | u16 | |
| 212 | fetch_word_imm(void) | |
| 213 | { | |
| 214 | u16 fetched; | |
| 215 | ||
| 216 | DB(if (CHECK_IP_FETCH()) | |
| 217 | x86emu_check_ip_access();) | |
| 218 | fetched = (*sys_rdw) (((u32) M.x86.R_CS << 4) + (M.x86.R_IP)); | |
| 219 | M.x86.R_IP += 2; | |
| 220 | INC_DECODED_INST_LEN(2); | |
| 221 | return fetched; | |
| 222 | } | |
| 223 | ||
| 224 | /**************************************************************************** | |
| 225 | RETURNS: | |
| 226 | Immediate lone value read from instruction queue | |
| 227 | ||
| 228 | REMARKS: | |
| 229 | This function returns the immediate byte from the instruction queue, and | |
| 230 | moves the instruction pointer to the next value. | |
| 231 | ||
| 232 | NOTE: Do not inline this function, as (*sys_rdw) is already inline! | |
| 233 | ****************************************************************************/ | |
| 234 | u32 | |
| 235 | fetch_long_imm(void) | |
| 236 | { | |
| 237 | u32 fetched; | |
| 238 | ||
| 239 | DB(if (CHECK_IP_FETCH()) | |
| 240 | x86emu_check_ip_access();) | |
| 241 | fetched = (*sys_rdl) (((u32) M.x86.R_CS << 4) + (M.x86.R_IP)); | |
| 242 | M.x86.R_IP += 4; | |
| 243 | INC_DECODED_INST_LEN(4); | |
| 244 | return fetched; | |
| 245 | } | |
| 246 | ||
| 247 | /**************************************************************************** | |
| 248 | RETURNS: | |
| 249 | Value of the default data segment | |
| 250 | ||
| 251 | REMARKS: | |
| 252 | Inline function that returns the default data segment for the current | |
| 253 | instruction. | |
| 254 | ||
| 255 | On the x86 processor, the default segment is not always DS if there is | |
| 256 | no segment override. Address modes such as -3[BP] or 10[BP+SI] all refer to | |
| 257 | addresses relative to SS (ie: on the stack). So, at the minimum, all | |
| 258 | decodings of addressing modes would have to set/clear a bit describing | |
| 259 | whether the access is relative to DS or SS. That is the function of the | |
| 260 | cpu-state-varible M.x86.mode. There are several potential states: | |
| 261 | ||
| 262 | repe prefix seen (handled elsewhere) | |
| 263 | repne prefix seen (ditto) | |
| 264 | ||
| 265 | cs segment override | |
| 266 | ds segment override | |
| 267 | es segment override | |
| 268 | fs segment override | |
| 269 | gs segment override | |
| 270 | ss segment override | |
| 271 | ||
| 272 | ds/ss select (in absense of override) | |
| 273 | ||
| 274 | Each of the above 7 items are handled with a bit in the mode field. | |
| 275 | ****************************************************************************/ | |
| 276 | _INLINE u32 | |
| 277 | get_data_segment(void) | |
| 278 | { | |
| 279 | #define GET_SEGMENT(segment) | |
| 280 | switch (M.x86.mode & SYSMODE_SEGMASK) { | |
| 281 | case 0: /* default case: use ds register */ | |
| 282 | case SYSMODE_SEGOVR_DS: | |
| 283 | case SYSMODE_SEGOVR_DS | SYSMODE_SEG_DS_SS: | |
| 284 | return M.x86.R_DS; | |
| 285 | case SYSMODE_SEG_DS_SS: /* non-overridden, use ss register */ | |
| 286 | return M.x86.R_SS; | |
| 287 | case SYSMODE_SEGOVR_CS: | |
| 288 | case SYSMODE_SEGOVR_CS | SYSMODE_SEG_DS_SS: | |
| 289 | return M.x86.R_CS; | |
| 290 | case SYSMODE_SEGOVR_ES: | |
| 291 | case SYSMODE_SEGOVR_ES | SYSMODE_SEG_DS_SS: | |
| 292 | return M.x86.R_ES; | |
| 293 | case SYSMODE_SEGOVR_FS: | |
| 294 | case SYSMODE_SEGOVR_FS | SYSMODE_SEG_DS_SS: | |
| 295 | return M.x86.R_FS; | |
| 296 | case SYSMODE_SEGOVR_GS: | |
| 297 | case SYSMODE_SEGOVR_GS | SYSMODE_SEG_DS_SS: | |
| 298 | return M.x86.R_GS; | |
| 299 | case SYSMODE_SEGOVR_SS: | |
| 300 | case SYSMODE_SEGOVR_SS | SYSMODE_SEG_DS_SS: | |
| 301 | return M.x86.R_SS; | |
| 302 | default: | |
| 303 | #ifdef DEBUG | |
| 304 | printk("error: should not happen: multiple overrides.\n"); | |
| 305 | #endif | |
| 306 | HALT_SYS(); | |
| 307 | return 0; | |
| 308 | } | |
| 309 | } | |
| 310 | ||
| 311 | /**************************************************************************** | |
| 312 | PARAMETERS: | |
| 313 | offset - Offset to load data from | |
| 314 | ||
| 315 | RETURNS: | |
| 316 | Byte value read from the absolute memory location. | |
| 317 | ||
| 318 | NOTE: Do not inline this function as (*sys_rdX) is already inline! | |
| 319 | ****************************************************************************/ | |
| 320 | u8 | |
| 321 | fetch_data_byte(uint offset) | |
| 322 | { | |
| 323 | #ifdef DEBUG | |
| 324 | if (CHECK_DATA_ACCESS()) | |
| 325 | x86emu_check_data_access((u16) get_data_segment(), offset); | |
| 326 | #endif | |
| 327 | return (*sys_rdb) ((get_data_segment() << 4) + offset); | |
| 328 | } | |
| 329 | ||
| 330 | /**************************************************************************** | |
| 331 | PARAMETERS: | |
| 332 | offset - Offset to load data from | |
| 333 | ||
| 334 | RETURNS: | |
| 335 | Word value read from the absolute memory location. | |
| 336 | ||
| 337 | NOTE: Do not inline this function as (*sys_rdX) is already inline! | |
| 338 | ****************************************************************************/ | |
| 339 | u16 | |
| 340 | fetch_data_word(uint offset) | |
| 341 | { | |
| 342 | #ifdef DEBUG | |
| 343 | if (CHECK_DATA_ACCESS()) | |
| 344 | x86emu_check_data_access((u16) get_data_segment(), offset); | |
| 345 | #endif | |
| 346 | return (*sys_rdw) ((get_data_segment() << 4) + offset); | |
| 347 | } | |
| 348 | ||
| 349 | /**************************************************************************** | |
| 350 | PARAMETERS: | |
| 351 | offset - Offset to load data from | |
| 352 | ||
| 353 | RETURNS: | |
| 354 | Long value read from the absolute memory location. | |
| 355 | ||
| 356 | NOTE: Do not inline this function as (*sys_rdX) is already inline! | |
| 357 | ****************************************************************************/ | |
| 358 | u32 | |
| 359 | fetch_data_long(uint offset) | |
| 360 | { | |
| 361 | #ifdef DEBUG | |
| 362 | if (CHECK_DATA_ACCESS()) | |
| 363 | x86emu_check_data_access((u16) get_data_segment(), offset); | |
| 364 | #endif | |
| 365 | return (*sys_rdl) ((get_data_segment() << 4) + offset); | |
| 366 | } | |
| 367 | ||
| 368 | /**************************************************************************** | |
| 369 | PARAMETERS: | |
| 370 | segment - Segment to load data from | |
| 371 | offset - Offset to load data from | |
| 372 | ||
| 373 | RETURNS: | |
| 374 | Byte value read from the absolute memory location. | |
| 375 | ||
| 376 | NOTE: Do not inline this function as (*sys_rdX) is already inline! | |
| 377 | ****************************************************************************/ | |
| 378 | u8 | |
| 379 | fetch_data_byte_abs(uint segment, uint offset) | |
| 380 | { | |
| 381 | #ifdef DEBUG | |
| 382 | if (CHECK_DATA_ACCESS()) | |
| 383 | x86emu_check_data_access(segment, offset); | |
| 384 | #endif | |
| 385 | return (*sys_rdb) (((u32) segment << 4) + offset); | |
| 386 | } | |
| 387 | ||
| 388 | /**************************************************************************** | |
| 389 | PARAMETERS: | |
| 390 | segment - Segment to load data from | |
| 391 | offset - Offset to load data from | |
| 392 | ||
| 393 | RETURNS: | |
| 394 | Word value read from the absolute memory location. | |
| 395 | ||
| 396 | NOTE: Do not inline this function as (*sys_rdX) is already inline! | |
| 397 | ****************************************************************************/ | |
| 398 | u16 | |
| 399 | fetch_data_word_abs(uint segment, uint offset) | |
| 400 | { | |
| 401 | #ifdef DEBUG | |
| 402 | if (CHECK_DATA_ACCESS()) | |
| 403 | x86emu_check_data_access(segment, offset); | |
| 404 | #endif | |
| 405 | return (*sys_rdw) (((u32) segment << 4) + offset); | |
| 406 | } | |
| 407 | ||
| 408 | /**************************************************************************** | |
| 409 | PARAMETERS: | |
| 410 | segment - Segment to load data from | |
| 411 | offset - Offset to load data from | |
| 412 | ||
| 413 | RETURNS: | |
| 414 | Long value read from the absolute memory location. | |
| 415 | ||
| 416 | NOTE: Do not inline this function as (*sys_rdX) is already inline! | |
| 417 | ****************************************************************************/ | |
| 418 | u32 | |
| 419 | fetch_data_long_abs(uint segment, uint offset) | |
| 420 | { | |
| 421 | #ifdef DEBUG | |
| 422 | if (CHECK_DATA_ACCESS()) | |
| 423 | x86emu_check_data_access(segment, offset); | |
| 424 | #endif | |
| 425 | return (*sys_rdl) (((u32) segment << 4) + offset); | |
| 426 | } | |
| 427 | ||
| 428 | /**************************************************************************** | |
| 429 | PARAMETERS: | |
| 430 | offset - Offset to store data at | |
| 431 | val - Value to store | |
| 432 | ||
| 433 | REMARKS: | |
| 434 | Writes a word value to an segmented memory location. The segment used is | |
| 435 | the current 'default' segment, which may have been overridden. | |
| 436 | ||
| 437 | NOTE: Do not inline this function as (*sys_wrX) is already inline! | |
| 438 | ****************************************************************************/ | |
| 439 | void | |
| 440 | store_data_byte(uint offset, u8 val) | |
| 441 | { | |
| 442 | #ifdef DEBUG | |
| 443 | if (CHECK_DATA_ACCESS()) | |
| 444 | x86emu_check_data_access((u16) get_data_segment(), offset); | |
| 445 | #endif | |
| 446 | (*sys_wrb) ((get_data_segment() << 4) + offset, val); | |
| 447 | } | |
| 448 | ||
| 449 | /**************************************************************************** | |
| 450 | PARAMETERS: | |
| 451 | offset - Offset to store data at | |
| 452 | val - Value to store | |
| 453 | ||
| 454 | REMARKS: | |
| 455 | Writes a word value to an segmented memory location. The segment used is | |
| 456 | the current 'default' segment, which may have been overridden. | |
| 457 | ||
| 458 | NOTE: Do not inline this function as (*sys_wrX) is already inline! | |
| 459 | ****************************************************************************/ | |
| 460 | void | |
| 461 | store_data_word(uint offset, u16 val) | |
| 462 | { | |
| 463 | #ifdef DEBUG | |
| 464 | if (CHECK_DATA_ACCESS()) | |
| 465 | x86emu_check_data_access((u16) get_data_segment(), offset); | |
| 466 | #endif | |
| 467 | (*sys_wrw) ((get_data_segment() << 4) + offset, val); | |
| 468 | } | |
| 469 | ||
| 470 | /**************************************************************************** | |
| 471 | PARAMETERS: | |
| 472 | offset - Offset to store data at | |
| 473 | val - Value to store | |
| 474 | ||
| 475 | REMARKS: | |
| 476 | Writes a long value to an segmented memory location. The segment used is | |
| 477 | the current 'default' segment, which may have been overridden. | |
| 478 | ||
| 479 | NOTE: Do not inline this function as (*sys_wrX) is already inline! | |
| 480 | ****************************************************************************/ | |
| 481 | void | |
| 482 | store_data_long(uint offset, u32 val) | |
| 483 | { | |
| 484 | #ifdef DEBUG | |
| 485 | if (CHECK_DATA_ACCESS()) | |
| 486 | x86emu_check_data_access((u16) get_data_segment(), offset); | |
| 487 | #endif | |
| 488 | (*sys_wrl) ((get_data_segment() << 4) + offset, val); | |
| 489 | } | |
| 490 | ||
| 491 | /**************************************************************************** | |
| 492 | PARAMETERS: | |
| 493 | segment - Segment to store data at | |
| 494 | offset - Offset to store data at | |
| 495 | val - Value to store | |
| 496 | ||
| 497 | REMARKS: | |
| 498 | Writes a byte value to an absolute memory location. | |
| 499 | ||
| 500 | NOTE: Do not inline this function as (*sys_wrX) is already inline! | |
| 501 | ****************************************************************************/ | |
| 502 | void | |
| 503 | store_data_byte_abs(uint segment, uint offset, u8 val) | |
| 504 | { | |
| 505 | #ifdef DEBUG | |
| 506 | if (CHECK_DATA_ACCESS()) | |
| 507 | x86emu_check_data_access(segment, offset); | |
| 508 | #endif | |
| 509 | (*sys_wrb) (((u32) segment << 4) + offset, val); | |
| 510 | } | |
| 511 | ||
| 512 | /**************************************************************************** | |
| 513 | PARAMETERS: | |
| 514 | segment - Segment to store data at | |
| 515 | offset - Offset to store data at | |
| 516 | val - Value to store | |
| 517 | ||
| 518 | REMARKS: | |
| 519 | Writes a word value to an absolute memory location. | |
| 520 | ||
| 521 | NOTE: Do not inline this function as (*sys_wrX) is already inline! | |
| 522 | ****************************************************************************/ | |
| 523 | void | |
| 524 | store_data_word_abs(uint segment, uint offset, u16 val) | |
| 525 | { | |
| 526 | #ifdef DEBUG | |
| 527 | if (CHECK_DATA_ACCESS()) | |
| 528 | x86emu_check_data_access(segment, offset); | |
| 529 | #endif | |
| 530 | (*sys_wrw) (((u32) segment << 4) + offset, val); | |
| 531 | } | |
| 532 | ||
| 533 | /**************************************************************************** | |
| 534 | PARAMETERS: | |
| 535 | segment - Segment to store data at | |
| 536 | offset - Offset to store data at | |
| 537 | val - Value to store | |
| 538 | ||
| 539 | REMARKS: | |
| 540 | Writes a long value to an absolute memory location. | |
| 541 | ||
| 542 | NOTE: Do not inline this function as (*sys_wrX) is already inline! | |
| 543 | ****************************************************************************/ | |
| 544 | void | |
| 545 | store_data_long_abs(uint segment, uint offset, u32 val) | |
| 546 | { | |
| 547 | #ifdef DEBUG | |
| 548 | if (CHECK_DATA_ACCESS()) | |
| 549 | x86emu_check_data_access(segment, offset); | |
| 550 | #endif | |
| 551 | (*sys_wrl) (((u32) segment << 4) + offset, val); | |
| 552 | } | |
| 553 | ||
| 554 | /**************************************************************************** | |
| 555 | PARAMETERS: | |
| 556 | reg - Register to decode | |
| 557 | ||
| 558 | RETURNS: | |
| 559 | Pointer to the appropriate register | |
| 560 | ||
| 561 | REMARKS: | |
| 562 | Return a pointer to the register given by the R/RM field of the | |
| 563 | modrm byte, for byte operands. Also enables the decoding of instructions. | |
| 564 | ****************************************************************************/ | |
| 565 | u8 * | |
| 566 | decode_rm_byte_register(int reg) | |
| 567 | { | |
| 568 | switch (reg) { | |
| 569 | case 0: | |
| 570 | DECODE_PRINTF("AL"); | |
| 571 | return &M.x86.R_AL; | |
| 572 | case 1: | |
| 573 | DECODE_PRINTF("CL"); | |
| 574 | return &M.x86.R_CL; | |
| 575 | case 2: | |
| 576 | DECODE_PRINTF("DL"); | |
| 577 | return &M.x86.R_DL; | |
| 578 | case 3: | |
| 579 | DECODE_PRINTF("BL"); | |
| 580 | return &M.x86.R_BL; | |
| 581 | case 4: | |
| 582 | DECODE_PRINTF("AH"); | |
| 583 | return &M.x86.R_AH; | |
| 584 | case 5: | |
| 585 | DECODE_PRINTF("CH"); | |
| 586 | return &M.x86.R_CH; | |
| 587 | case 6: | |
| 588 | DECODE_PRINTF("DH"); | |
| 589 | return &M.x86.R_DH; | |
| 590 | case 7: | |
| 591 | DECODE_PRINTF("BH"); | |
| 592 | return &M.x86.R_BH; | |
| 593 | } | |
| 594 | HALT_SYS(); | |
| 595 | return NULL; /* NOT REACHED OR REACHED ON ERROR */ | |
| 596 | } | |
| 597 | ||
| 598 | /**************************************************************************** | |
| 599 | PARAMETERS: | |
| 600 | reg - Register to decode | |
| 601 | ||
| 602 | RETURNS: | |
| 603 | Pointer to the appropriate register | |
| 604 | ||
| 605 | REMARKS: | |
| 606 | Return a pointer to the register given by the R/RM field of the | |
| 607 | modrm byte, for word operands. Also enables the decoding of instructions. | |
| 608 | ****************************************************************************/ | |
| 609 | u16 * | |
| 610 | decode_rm_word_register(int reg) | |
| 611 | { | |
| 612 | switch (reg) { | |
| 613 | case 0: | |
| 614 | DECODE_PRINTF("AX"); | |
| 615 | return &M.x86.R_AX; | |
| 616 | case 1: | |
| 617 | DECODE_PRINTF("CX"); | |
| 618 | return &M.x86.R_CX; | |
| 619 | case 2: | |
| 620 | DECODE_PRINTF("DX"); | |
| 621 | return &M.x86.R_DX; | |
| 622 | case 3: | |
| 623 | DECODE_PRINTF("BX"); | |
| 624 | return &M.x86.R_BX; | |
| 625 | case 4: | |
| 626 | DECODE_PRINTF("SP"); | |
| 627 | return &M.x86.R_SP; | |
| 628 | case 5: | |
| 629 | DECODE_PRINTF("BP"); | |
| 630 | return &M.x86.R_BP; | |
| 631 | case 6: | |
| 632 | DECODE_PRINTF("SI"); | |
| 633 | return &M.x86.R_SI; | |
| 634 | case 7: | |
| 635 | DECODE_PRINTF("DI"); | |
| 636 | return &M.x86.R_DI; | |
| 637 | } | |
| 638 | HALT_SYS(); | |
| 639 | return NULL; /* NOTREACHED OR REACHED ON ERROR */ | |
| 640 | } | |
| 641 | ||
| 642 | /**************************************************************************** | |
| 643 | PARAMETERS: | |
| 644 | reg - Register to decode | |
| 645 | ||
| 646 | RETURNS: | |
| 647 | Pointer to the appropriate register | |
| 648 | ||
| 649 | REMARKS: | |
| 650 | Return a pointer to the register given by the R/RM field of the | |
| 651 | modrm byte, for dword operands. Also enables the decoding of instructions. | |
| 652 | ****************************************************************************/ | |
| 653 | u32 * | |
| 654 | decode_rm_long_register(int reg) | |
| 655 | { | |
| 656 | switch (reg) { | |
| 657 | case 0: | |
| 658 | DECODE_PRINTF("EAX"); | |
| 659 | return &M.x86.R_EAX; | |
| 660 | case 1: | |
| 661 | DECODE_PRINTF("ECX"); | |
| 662 | return &M.x86.R_ECX; | |
| 663 | case 2: | |
| 664 | DECODE_PRINTF("EDX"); | |
| 665 | return &M.x86.R_EDX; | |
| 666 | case 3: | |
| 667 | DECODE_PRINTF("EBX"); | |
| 668 | return &M.x86.R_EBX; | |
| 669 | case 4: | |
| 670 | DECODE_PRINTF("ESP"); | |
| 671 | return &M.x86.R_ESP; | |
| 672 | case 5: | |
| 673 | DECODE_PRINTF("EBP"); | |
| 674 | return &M.x86.R_EBP; | |
| 675 | case 6: | |
| 676 | DECODE_PRINTF("ESI"); | |
| 677 | return &M.x86.R_ESI; | |
| 678 | case 7: | |
| 679 | DECODE_PRINTF("EDI"); | |
| 680 | return &M.x86.R_EDI; | |
| 681 | } | |
| 682 | HALT_SYS(); | |
| 683 | return NULL; /* NOTREACHED OR REACHED ON ERROR */ | |
| 684 | } | |
| 685 | ||
| 686 | /**************************************************************************** | |
| 687 | PARAMETERS: | |
| 688 | reg - Register to decode | |
| 689 | ||
| 690 | RETURNS: | |
| 691 | Pointer to the appropriate register | |
| 692 | ||
| 693 | REMARKS: | |
| 694 | Return a pointer to the register given by the R/RM field of the | |
| 695 | modrm byte, for word operands, modified from above for the weirdo | |
| 696 | special case of segreg operands. Also enables the decoding of instructions. | |
| 697 | ****************************************************************************/ | |
| 698 | u16 * | |
| 699 | decode_rm_seg_register(int reg) | |
| 700 | { | |
| 701 | switch (reg) { | |
| 702 | case 0: | |
| 703 | DECODE_PRINTF("ES"); | |
| 704 | return &M.x86.R_ES; | |
| 705 | case 1: | |
| 706 | DECODE_PRINTF("CS"); | |
| 707 | return &M.x86.R_CS; | |
| 708 | case 2: | |
| 709 | DECODE_PRINTF("SS"); | |
| 710 | return &M.x86.R_SS; | |
| 711 | case 3: | |
| 712 | DECODE_PRINTF("DS"); | |
| 713 | return &M.x86.R_DS; | |
| 714 | case 4: | |
| 715 | DECODE_PRINTF("FS"); | |
| 716 | return &M.x86.R_FS; | |
| 717 | case 5: | |
| 718 | DECODE_PRINTF("GS"); | |
| 719 | return &M.x86.R_GS; | |
| 720 | case 6: | |
| 721 | case 7: | |
| 722 | DECODE_PRINTF("ILLEGAL SEGREG"); | |
| 723 | break; | |
| 724 | } | |
| 725 | HALT_SYS(); | |
| 726 | return NULL; /* NOT REACHED OR REACHED ON ERROR */ | |
| 727 | } | |
| 728 | ||
| 729 | /* | |
| 730 | * | |
| 731 | * return offset from the SIB Byte | |
| 732 | */ | |
| 733 | u32 | |
| 734 | decode_sib_address(int sib, int mod) | |
| 735 | { | |
| 736 | u32 base = 0, i = 0, scale = 1; | |
| 737 | ||
| 738 | switch (sib & 0x07) { | |
| 739 | case 0: | |
| 740 | DECODE_PRINTF("[EAX]"); | |
| 741 | base = M.x86.R_EAX; | |
| 742 | break; | |
| 743 | case 1: | |
| 744 | DECODE_PRINTF("[ECX]"); | |
| 745 | base = M.x86.R_ECX; | |
| 746 | break; | |
| 747 | case 2: | |
| 748 | DECODE_PRINTF("[EDX]"); | |
| 749 | base = M.x86.R_EDX; | |
| 750 | break; | |
| 751 | case 3: | |
| 752 | DECODE_PRINTF("[EBX]"); | |
| 753 | base = M.x86.R_EBX; | |
| 754 | break; | |
| 755 | case 4: | |
| 756 | DECODE_PRINTF("[ESP]"); | |
| 757 | base = M.x86.R_ESP; | |
| 758 | M.x86.mode |= SYSMODE_SEG_DS_SS; | |
| 759 | break; | |
| 760 | case 5: | |
| 761 | if (mod == 0) { | |
| 762 | base = fetch_long_imm(); | |
| 763 | DECODE_PRINTF2("%08x", base); | |
| 764 | } | |
| 765 | else { | |
| 766 | DECODE_PRINTF("[EBP]"); | |
| 767 | base = M.x86.R_ESP; | |
| 768 | M.x86.mode |= SYSMODE_SEG_DS_SS; | |
| 769 | } | |
| 770 | break; | |
| 771 | case 6: | |
| 772 | DECODE_PRINTF("[ESI]"); | |
| 773 | base = M.x86.R_ESI; | |
| 774 | break; | |
| 775 | case 7: | |
| 776 | DECODE_PRINTF("[EDI]"); | |
| 777 | base = M.x86.R_EDI; | |
| 778 | break; | |
| 779 | } | |
| 780 | switch ((sib >> 3) & 0x07) { | |
| 781 | case 0: | |
| 782 | DECODE_PRINTF("[EAX"); | |
| 783 | i = M.x86.R_EAX; | |
| 784 | break; | |
| 785 | case 1: | |
| 786 | DECODE_PRINTF("[ECX"); | |
| 787 | i = M.x86.R_ECX; | |
| 788 | break; | |
| 789 | case 2: | |
| 790 | DECODE_PRINTF("[EDX"); | |
| 791 | i = M.x86.R_EDX; | |
| 792 | break; | |
| 793 | case 3: | |
| 794 | DECODE_PRINTF("[EBX"); | |
| 795 | i = M.x86.R_EBX; | |
| 796 | break; | |
| 797 | case 4: | |
| 798 | i = 0; | |
| 799 | break; | |
| 800 | case 5: | |
| 801 | DECODE_PRINTF("[EBP"); | |
| 802 | i = M.x86.R_EBP; | |
| 803 | break; | |
| 804 | case 6: | |
| 805 | DECODE_PRINTF("[ESI"); | |
| 806 | i = M.x86.R_ESI; | |
| 807 | break; | |
| 808 | case 7: | |
| 809 | DECODE_PRINTF("[EDI"); | |
| 810 | i = M.x86.R_EDI; | |
| 811 | break; | |
| 812 | } | |
| 813 | scale = 1 << ((sib >> 6) & 0x03); | |
| 814 | if (((sib >> 3) & 0x07) != 4) { | |
| 815 | if (scale == 1) { | |
| 816 | DECODE_PRINTF("]"); | |
| 817 | } | |
| 818 | else { | |
| 819 | DECODE_PRINTF2("*%d]", scale); | |
| 820 | } | |
| 821 | } | |
| 822 | return base + (i * scale); | |
| 823 | } | |
| 824 | ||
| 825 | /**************************************************************************** | |
| 826 | PARAMETERS: | |
| 827 | rm - RM value to decode | |
| 828 | ||
| 829 | RETURNS: | |
| 830 | Offset in memory for the address decoding | |
| 831 | ||
| 832 | REMARKS: | |
| 833 | Return the offset given by mod=00 addressing. Also enables the | |
| 834 | decoding of instructions. | |
| 835 | ||
| 836 | NOTE: The code which specifies the corresponding segment (ds vs ss) | |
| 837 | below in the case of [BP+..]. The assumption here is that at the | |
| 838 | point that this subroutine is called, the bit corresponding to | |
| 839 | SYSMODE_SEG_DS_SS will be zero. After every instruction | |
| 840 | except the segment override instructions, this bit (as well | |
| 841 | as any bits indicating segment overrides) will be clear. So | |
| 842 | if a SS access is needed, set this bit. Otherwise, DS access | |
| 843 | occurs (unless any of the segment override bits are set). | |
| 844 | ****************************************************************************/ | |
| 845 | u32 | |
| 846 | decode_rm00_address(int rm) | |
| 847 | { | |
| 848 | u32 offset; | |
| 849 | int sib; | |
| 850 | ||
| 851 | if (M.x86.mode & SYSMODE_PREFIX_ADDR) { | |
| 852 | /* 32-bit addressing */ | |
| 853 | switch (rm) { | |
| 854 | case 0: | |
| 855 | DECODE_PRINTF("[EAX]"); | |
| 856 | return M.x86.R_EAX; | |
| 857 | case 1: | |
| 858 | DECODE_PRINTF("[ECX]"); | |
| 859 | return M.x86.R_ECX; | |
| 860 | case 2: | |
| 861 | DECODE_PRINTF("[EDX]"); | |
| 862 | return M.x86.R_EDX; | |
| 863 | case 3: | |
| 864 | DECODE_PRINTF("[EBX]"); | |
| 865 | return M.x86.R_EBX; | |
| 866 | case 4: | |
| 867 | sib = fetch_byte_imm(); | |
| 868 | return decode_sib_address(sib, 0); | |
| 869 | case 5: | |
| 870 | offset = fetch_long_imm(); | |
| 871 | DECODE_PRINTF2("[%08x]", offset); | |
| 872 | return offset; | |
| 873 | case 6: | |
| 874 | DECODE_PRINTF("[ESI]"); | |
| 875 | return M.x86.R_ESI; | |
| 876 | case 7: | |
| 877 | DECODE_PRINTF("[EDI]"); | |
| 878 | return M.x86.R_EDI; | |
| 879 | } | |
| 880 | HALT_SYS(); | |
| 881 | } | |
| 882 | else { | |
| 883 | /* 16-bit addressing */ | |
| 884 | switch (rm) { | |
| 885 | case 0: | |
| 886 | DECODE_PRINTF("[BX+SI]"); | |
| 887 | return (M.x86.R_BX + M.x86.R_SI) & 0xffff; | |
| 888 | case 1: | |
| 889 | DECODE_PRINTF("[BX+DI]"); | |
| 890 | return (M.x86.R_BX + M.x86.R_DI) & 0xffff; | |
| 891 | case 2: | |
| 892 | DECODE_PRINTF("[BP+SI]"); | |
| 893 | M.x86.mode |= SYSMODE_SEG_DS_SS; | |
| 894 | return (M.x86.R_BP + M.x86.R_SI) & 0xffff; | |
| 895 | case 3: | |
| 896 | DECODE_PRINTF("[BP+DI]"); | |
| 897 | M.x86.mode |= SYSMODE_SEG_DS_SS; | |
| 898 | return (M.x86.R_BP + M.x86.R_DI) & 0xffff; | |
| 899 | case 4: | |
| 900 | DECODE_PRINTF("[SI]"); | |
| 901 | return M.x86.R_SI; | |
| 902 | case 5: | |
| 903 | DECODE_PRINTF("[DI]"); | |
| 904 | return M.x86.R_DI; | |
| 905 | case 6: | |
| 906 | offset = fetch_word_imm(); | |
| 907 | DECODE_PRINTF2("[%04x]", offset); | |
| 908 | return offset; | |
| 909 | case 7: | |
| 910 | DECODE_PRINTF("[BX]"); | |
| 911 | return M.x86.R_BX; | |
| 912 | } | |
| 913 | HALT_SYS(); | |
| 914 | } | |
| 915 | return 0; | |
| 916 | } | |
| 917 | ||
| 918 | /**************************************************************************** | |
| 919 | PARAMETERS: | |
| 920 | rm - RM value to decode | |
| 921 | ||
| 922 | RETURNS: | |
| 923 | Offset in memory for the address decoding | |
| 924 | ||
| 925 | REMARKS: | |
| 926 | Return the offset given by mod=01 addressing. Also enables the | |
| 927 | decoding of instructions. | |
| 928 | ****************************************************************************/ | |
| 929 | u32 | |
| 930 | decode_rm01_address(int rm) | |
| 931 | { | |
| 932 | int displacement = 0; | |
| 933 | int sib; | |
| 934 | ||
| 935 | /* Fetch disp8 if no SIB byte */ | |
| 936 | if (!((M.x86.mode & SYSMODE_PREFIX_ADDR) && (rm == 4))) | |
| 937 | displacement = (s8) fetch_byte_imm(); | |
| 938 | ||
| 939 | if (M.x86.mode & SYSMODE_PREFIX_ADDR) { | |
| 940 | /* 32-bit addressing */ | |
| 941 | switch (rm) { | |
| 942 | case 0: | |
| 943 | DECODE_PRINTF2("%d[EAX]", displacement); | |
| 944 | return M.x86.R_EAX + displacement; | |
| 945 | case 1: | |
| 946 | DECODE_PRINTF2("%d[ECX]", displacement); | |
| 947 | return M.x86.R_ECX + displacement; | |
| 948 | case 2: | |
| 949 | DECODE_PRINTF2("%d[EDX]", displacement); | |
| 950 | return M.x86.R_EDX + displacement; | |
| 951 | case 3: | |
| 952 | DECODE_PRINTF2("%d[EBX]", displacement); | |
| 953 | return M.x86.R_EBX + displacement; | |
| 954 | case 4: | |
| 955 | sib = fetch_byte_imm(); | |
| 956 | displacement = (s8) fetch_byte_imm(); | |
| 957 | DECODE_PRINTF2("%d", displacement); | |
| 958 | return decode_sib_address(sib, 1) + displacement; | |
| 959 | case 5: | |
| 960 | DECODE_PRINTF2("%d[EBP]", displacement); | |
| 961 | return M.x86.R_EBP + displacement; | |
| 962 | case 6: | |
| 963 | DECODE_PRINTF2("%d[ESI]", displacement); | |
| 964 | return M.x86.R_ESI + displacement; | |
| 965 | case 7: | |
| 966 | DECODE_PRINTF2("%d[EDI]", displacement); | |
| 967 | return M.x86.R_EDI + displacement; | |
| 968 | } | |
| 969 | HALT_SYS(); | |
| 970 | } | |
| 971 | else { | |
| 972 | /* 16-bit addressing */ | |
| 973 | switch (rm) { | |
| 974 | case 0: | |
| 975 | DECODE_PRINTF2("%d[BX+SI]", displacement); | |
| 976 | return (M.x86.R_BX + M.x86.R_SI + displacement) & 0xffff; | |
| 977 | case 1: | |
| 978 | DECODE_PRINTF2("%d[BX+DI]", displacement); | |
| 979 | return (M.x86.R_BX + M.x86.R_DI + displacement) & 0xffff; | |
| 980 | case 2: | |
| 981 | DECODE_PRINTF2("%d[BP+SI]", displacement); | |
| 982 | M.x86.mode |= SYSMODE_SEG_DS_SS; | |
| 983 | return (M.x86.R_BP + M.x86.R_SI + displacement) & 0xffff; | |
| 984 | case 3: | |
| 985 | DECODE_PRINTF2("%d[BP+DI]", displacement); | |
| 986 | M.x86.mode |= SYSMODE_SEG_DS_SS; | |
| 987 | return (M.x86.R_BP + M.x86.R_DI + displacement) & 0xffff; | |
| 988 | case 4: | |
| 989 | DECODE_PRINTF2("%d[SI]", displacement); | |
| 990 | return (M.x86.R_SI + displacement) & 0xffff; | |
| 991 | case 5: | |
| 992 | DECODE_PRINTF2("%d[DI]", displacement); | |
| 993 | return (M.x86.R_DI + displacement) & 0xffff; | |
| 994 | case 6: | |
| 995 | DECODE_PRINTF2("%d[BP]", displacement); | |
| 996 | M.x86.mode |= SYSMODE_SEG_DS_SS; | |
| 997 | return (M.x86.R_BP + displacement) & 0xffff; | |
| 998 | case 7: | |
| 999 | DECODE_PRINTF2("%d[BX]", displacement); | |
| 1000 | return (M.x86.R_BX + displacement) & 0xffff; | |
| 1001 | } | |
| 1002 | HALT_SYS(); | |
| 1003 | } | |
| 1004 | return 0; /* SHOULD NOT HAPPEN */ | |
| 1005 | } | |
| 1006 | ||
| 1007 | /**************************************************************************** | |
| 1008 | PARAMETERS: | |
| 1009 | rm - RM value to decode | |
| 1010 | ||
| 1011 | RETURNS: | |
| 1012 | Offset in memory for the address decoding | |
| 1013 | ||
| 1014 | REMARKS: | |
| 1015 | Return the offset given by mod=10 addressing. Also enables the | |
| 1016 | decoding of instructions. | |
| 1017 | ****************************************************************************/ | |
| 1018 | u32 | |
| 1019 | decode_rm10_address(int rm) | |
| 1020 | { | |
| 1021 | u32 displacement = 0; | |
| 1022 | int sib; | |
| 1023 | ||
| 1024 | /* Fetch disp16 if 16-bit addr mode */ | |
| 1025 | if (!(M.x86.mode & SYSMODE_PREFIX_ADDR)) | |
| 1026 | displacement = (u16) fetch_word_imm(); | |
| 1027 | else { | |
| 1028 | /* Fetch disp32 if no SIB byte */ | |
| 1029 | if (rm != 4) | |
| 1030 | displacement = (u32) fetch_long_imm(); | |
| 1031 | } | |
| 1032 | ||
| 1033 | if (M.x86.mode & SYSMODE_PREFIX_ADDR) { | |
| 1034 | /* 32-bit addressing */ | |
| 1035 | switch (rm) { | |
| 1036 | case 0: | |
| 1037 | DECODE_PRINTF2("%08x[EAX]", displacement); | |
| 1038 | return M.x86.R_EAX + displacement; | |
| 1039 | case 1: | |
| 1040 | DECODE_PRINTF2("%08x[ECX]", displacement); | |
| 1041 | return M.x86.R_ECX + displacement; | |
| 1042 | case 2: | |
| 1043 | DECODE_PRINTF2("%08x[EDX]", displacement); | |
| 1044 | M.x86.mode |= SYSMODE_SEG_DS_SS; | |
| 1045 | return M.x86.R_EDX + displacement; | |
| 1046 | case 3: | |
| 1047 | DECODE_PRINTF2("%08x[EBX]", displacement); | |
| 1048 | return M.x86.R_EBX + displacement; | |
| 1049 | case 4: | |
| 1050 | sib = fetch_byte_imm(); | |
| 1051 | displacement = (u32) fetch_long_imm(); | |
| 1052 | DECODE_PRINTF2("%08x", displacement); | |
| 1053 | return decode_sib_address(sib, 2) + displacement; | |
| 1054 | break; | |
| 1055 | case 5: | |
| 1056 | DECODE_PRINTF2("%08x[EBP]", displacement); | |
| 1057 | return M.x86.R_EBP + displacement; | |
| 1058 | case 6: | |
| 1059 | DECODE_PRINTF2("%08x[ESI]", displacement); | |
| 1060 | return M.x86.R_ESI + displacement; | |
| 1061 | case 7: | |
| 1062 | DECODE_PRINTF2("%08x[EDI]", displacement); | |
| 1063 | return M.x86.R_EDI + displacement; | |
| 1064 | } | |
| 1065 | HALT_SYS(); | |
| 1066 | } | |
| 1067 | else { | |
| 1068 | /* 16-bit addressing */ | |
| 1069 | switch (rm) { | |
| 1070 | case 0: | |
| 1071 | DECODE_PRINTF2("%04x[BX+SI]", displacement); | |
| 1072 | return (M.x86.R_BX + M.x86.R_SI + displacement) & 0xffff; | |
| 1073 | case 1: | |
| 1074 | DECODE_PRINTF2("%04x[BX+DI]", displacement); | |
| 1075 | return (M.x86.R_BX + M.x86.R_DI + displacement) & 0xffff; | |
| 1076 | case 2: | |
| 1077 | DECODE_PRINTF2("%04x[BP+SI]", displacement); | |
| 1078 | M.x86.mode |= SYSMODE_SEG_DS_SS; | |
| 1079 | return (M.x86.R_BP + M.x86.R_SI + displacement) & 0xffff; | |
| 1080 | case 3: | |
| 1081 | DECODE_PRINTF2("%04x[BP+DI]", displacement); | |
| 1082 | M.x86.mode |= SYSMODE_SEG_DS_SS; | |
| 1083 | return (M.x86.R_BP + M.x86.R_DI + displacement) & 0xffff; | |
| 1084 | case 4: | |
| 1085 | DECODE_PRINTF2("%04x[SI]", displacement); | |
| 1086 | return (M.x86.R_SI + displacement) & 0xffff; | |
| 1087 | case 5: | |
| 1088 | DECODE_PRINTF2("%04x[DI]", displacement); | |
| 1089 | return (M.x86.R_DI + displacement) & 0xffff; | |
| 1090 | case 6: | |
| 1091 | DECODE_PRINTF2("%04x[BP]", displacement); | |
| 1092 | M.x86.mode |= SYSMODE_SEG_DS_SS; | |
| 1093 | return (M.x86.R_BP + displacement) & 0xffff; | |
| 1094 | case 7: | |
| 1095 | DECODE_PRINTF2("%04x[BX]", displacement); | |
| 1096 | return (M.x86.R_BX + displacement) & 0xffff; | |
| 1097 | } | |
| 1098 | HALT_SYS(); | |
| 1099 | } | |
| 1100 | return 0; | |
| 1101 | /*NOTREACHED */ | |
| 1102 | } |