1 ;;;; that part of the description of the x86 instruction set (for
2 ;;;; 80386 and above) which can live on the cross-compilation host
4 ;;;; This software is part of the SBCL system. See the README file for
7 ;;;; This software is derived from the CMU CL system, which was
8 ;;;; written at Carnegie Mellon University and released into the
9 ;;;; public domain. The software is in the public domain and is
10 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
11 ;;;; files for more information.
14 ;;; FIXME: SB!DISASSEM: prefixes are used so widely in this file that
15 ;;; I wonder whether the separation of the disassembler from the
16 ;;; virtual machine is valid or adds value.
21 ;;; FIXME: In CMU CL, the code in this file seems to be fully
22 ;;; compiled, not byte compiled. I'm not sure that's reasonable:
23 ;;; there's a lot of code in this file, and considering the overall
24 ;;; speed of the compiler, having some byte-interpretation overhead
25 ;;; for every few bytes emitted doesn't seem likely to be noticeable.
26 ;;; I'd like to see what happens if I come back and byte-compile this
29 ;;; Note: In CMU CL, this used to be a call to SET-DISASSEM-PARAMS.
30 (setf sb!disassem:*disassem-inst-alignment-bytes* 1)
32 (deftype reg () '(unsigned-byte 3))
34 (eval-when (#-sb-xc :compile-toplevel :load-toplevel :execute)
36 (defun offset-next (value dstate)
37 (declare (type integer value)
38 (type sb!disassem:disassem-state dstate))
39 (+ (sb!disassem:dstate-next-addr dstate) value))
41 (defparameter *default-address-size*
42 ;; Actually, :DWORD is the only one really supported.
45 (defparameter *byte-reg-names*
46 #(al cl dl bl ah ch dh bh))
47 (defparameter *word-reg-names*
48 #(ax cx dx bx sp bp si di))
49 (defparameter *dword-reg-names*
50 #(eax ecx edx ebx esp ebp esi edi))
52 (defun print-reg-with-width (value width stream dstate)
53 (declare (ignore dstate))
54 (princ (aref (ecase width
55 (:byte *byte-reg-names*)
56 (:word *word-reg-names*)
57 (:dword *dword-reg-names*))
60 ;; XXX plus should do some source-var notes
63 (defun print-reg (value stream dstate)
64 (declare (type reg value)
66 (type sb!disassem:disassem-state dstate))
67 (print-reg-with-width value
68 (sb!disassem:dstate-get-prop dstate 'width)
72 (defun print-word-reg (value stream dstate)
73 (declare (type reg value)
75 (type sb!disassem:disassem-state dstate))
76 (print-reg-with-width value
77 (or (sb!disassem:dstate-get-prop dstate 'word-width)
78 +default-operand-size+)
82 (defun print-byte-reg (value stream dstate)
83 (declare (type reg value)
85 (type sb!disassem:disassem-state dstate))
86 (print-reg-with-width value :byte stream dstate))
88 (defun print-addr-reg (value stream dstate)
89 (declare (type reg value)
91 (type sb!disassem:disassem-state dstate))
92 (print-reg-with-width value *default-address-size* stream dstate))
94 (defun print-reg/mem (value stream dstate)
95 (declare (type (or list reg) value)
97 (type sb!disassem:disassem-state dstate))
98 (if (typep value 'reg)
99 (print-reg value stream dstate)
100 (print-mem-access value stream nil dstate)))
102 ;; Same as print-reg/mem, but prints an explicit size indicator for
103 ;; memory references.
104 (defun print-sized-reg/mem (value stream dstate)
105 (declare (type (or list reg) value)
107 (type sb!disassem:disassem-state dstate))
108 (if (typep value 'reg)
109 (print-reg value stream dstate)
110 (print-mem-access value stream t dstate)))
112 (defun print-byte-reg/mem (value stream dstate)
113 (declare (type (or list reg) value)
115 (type sb!disassem:disassem-state dstate))
116 (if (typep value 'reg)
117 (print-byte-reg value stream dstate)
118 (print-mem-access value stream t dstate)))
120 (defun print-label (value stream dstate)
121 (declare (ignore dstate))
122 (sb!disassem:princ16 value stream))
124 ;;; Returns either an integer, meaning a register, or a list of
125 ;;; (BASE-REG OFFSET INDEX-REG INDEX-SCALE), where any component
126 ;;; may be missing or nil to indicate that it's not used or has the
127 ;;; obvious default value (e.g., 1 for the index-scale).
128 (defun prefilter-reg/mem (value dstate)
129 (declare (type list value)
130 (type sb!disassem:disassem-state dstate))
131 (let ((mod (car value))
133 (declare (type (unsigned-byte 2) mod)
134 (type (unsigned-byte 3) r/m))
140 (let ((sib (sb!disassem:read-suffix 8 dstate)))
141 (declare (type (unsigned-byte 8) sib))
142 (let ((base-reg (ldb (byte 3 0) sib))
143 (index-reg (ldb (byte 3 3) sib))
144 (index-scale (ldb (byte 2 6) sib)))
145 (declare (type (unsigned-byte 3) base-reg index-reg)
146 (type (unsigned-byte 2) index-scale))
150 (if (= base-reg #b101)
151 (sb!disassem:read-signed-suffix 32 dstate)
154 (sb!disassem:read-signed-suffix 8 dstate))
156 (sb!disassem:read-signed-suffix 32 dstate)))))
157 (list (if (and (= mod #b00) (= base-reg #b101)) nil base-reg)
159 (if (= index-reg #b100) nil index-reg)
160 (ash 1 index-scale))))))
161 ((and (= mod #b00) (= r/m #b101))
162 (list nil (sb!disassem:read-signed-suffix 32 dstate)) )
166 (list r/m (sb!disassem:read-signed-suffix 8 dstate)))
168 (list r/m (sb!disassem:read-signed-suffix 32 dstate))))))
171 ;;; This is a sort of bogus prefilter that just stores the info globally for
172 ;;; other people to use; it probably never gets printed.
173 (defun prefilter-width (value dstate)
174 (setf (sb!disassem:dstate-get-prop dstate 'width)
178 ;; set by a prefix instruction
179 (or (sb!disassem:dstate-get-prop dstate 'word-width)
180 +default-operand-size+)))
181 (when (not (eql word-width +default-operand-size+))
183 (setf (sb!disassem:dstate-get-prop dstate 'word-width)
184 +default-operand-size+))
187 (defun read-address (value dstate)
188 (declare (ignore value)) ; always nil anyway
189 (sb!disassem:read-suffix (width-bits *default-address-size*) dstate))
191 (defun width-bits (width)
201 ;;;; disassembler argument types
203 (sb!disassem:define-argument-type displacement
205 :use-label #'offset-next)
207 (sb!disassem:define-argument-type accum
208 :printer #'(lambda (value stream dstate)
209 (declare (ignore value)
211 (type sb!disassem:disassem-state dstate))
212 (print-reg 0 stream dstate))
215 (sb!disassem:define-argument-type word-accum
216 :printer #'(lambda (value stream dstate)
217 (declare (ignore value)
219 (type sb!disassem:disassem-state dstate))
220 (print-word-reg 0 stream dstate)))
222 (sb!disassem:define-argument-type reg
223 :printer #'print-reg)
225 (sb!disassem:define-argument-type addr-reg
226 :printer #'print-addr-reg)
228 (sb!disassem:define-argument-type word-reg
229 :printer #'print-word-reg)
231 (sb!disassem:define-argument-type imm-addr
232 :prefilter #'read-address
233 :printer #'print-label)
235 (sb!disassem:define-argument-type imm-data
236 :prefilter #'(lambda (value dstate)
237 (declare (ignore value)) ; always nil anyway
238 (sb!disassem:read-suffix
239 (width-bits (sb!disassem:dstate-get-prop dstate 'width))
243 (sb!disassem:define-argument-type signed-imm-data
244 :prefilter #'(lambda (value dstate)
245 (declare (ignore value)) ; always nil anyway
246 (let ((width (sb!disassem:dstate-get-prop dstate 'width)))
247 (sb!disassem:read-signed-suffix (width-bits width) dstate)))
250 (sb!disassem:define-argument-type signed-imm-byte
251 :prefilter #'(lambda (value dstate)
252 (declare (ignore value)) ; always nil anyway
253 (sb!disassem:read-signed-suffix 8 dstate)))
255 (sb!disassem:define-argument-type signed-imm-dword
256 :prefilter #'(lambda (value dstate)
257 (declare (ignore value)) ; always nil anyway
258 (sb!disassem:read-signed-suffix 32 dstate)))
260 (sb!disassem:define-argument-type imm-word
261 :prefilter #'(lambda (value dstate)
262 (declare (ignore value)) ; always nil anyway
264 (or (sb!disassem:dstate-get-prop dstate 'word-width)
265 +default-operand-size+)))
266 (sb!disassem:read-suffix (width-bits width) dstate))))
268 ;;; needed for the ret imm16 instruction
269 (sb!disassem:define-argument-type imm-word-16
270 :prefilter #'(lambda (value dstate)
271 (declare (ignore value)) ; always nil anyway
272 (sb!disassem:read-suffix 16 dstate)))
274 (sb!disassem:define-argument-type reg/mem
275 :prefilter #'prefilter-reg/mem
276 :printer #'print-reg/mem)
277 (sb!disassem:define-argument-type sized-reg/mem
278 ;; Same as reg/mem, but prints an explicit size indicator for
279 ;; memory references.
280 :prefilter #'prefilter-reg/mem
281 :printer #'print-sized-reg/mem)
282 (sb!disassem:define-argument-type byte-reg/mem
283 :prefilter #'prefilter-reg/mem
284 :printer #'print-byte-reg/mem)
287 (eval-when (:compile-toplevel :load-toplevel :execute)
288 (defun print-fp-reg (value stream dstate)
289 (declare (ignore dstate))
290 (format stream "FR~D" value))
292 (defun prefilter-fp-reg (value dstate)
294 (declare (ignore dstate))
297 (sb!disassem:define-argument-type fp-reg
298 :prefilter #'prefilter-fp-reg
299 :printer #'print-fp-reg)
301 (sb!disassem:define-argument-type width
302 :prefilter #'prefilter-width
303 :printer #'(lambda (value stream dstate)
306 (and (numberp value) (zerop value))) ; zzz jrd
309 ;; set by a prefix instruction
310 (or (sb!disassem:dstate-get-prop dstate 'word-width)
311 +default-operand-size+)))
312 (princ (schar (symbol-name word-width) 0) stream)))))
314 (eval-when (:compile-toplevel :load-toplevel :execute)
315 (defconstant conditions
318 (:b . 2) (:nae . 2) (:c . 2)
319 (:nb . 3) (:ae . 3) (:nc . 3)
320 (:eq . 4) (:e . 4) (:z . 4)
327 (:np . 11) (:po . 11)
328 (:l . 12) (:nge . 12)
329 (:nl . 13) (:ge . 13)
330 (:le . 14) (:ng . 14)
331 (:nle . 15) (:g . 15)))
333 (defparameter *condition-name-vec*
334 (let ((vec (make-array 16 :initial-element nil)))
335 (dolist (cond conditions)
336 (when (null (aref vec (cdr cond)))
337 (setf (aref vec (cdr cond)) (car cond))))
341 ;;; Set assembler parameters. (In CMU CL, this was done with
342 ;;; a call to a macro DEF-ASSEMBLER-PARAMS.)
343 (eval-when (:compile-toplevel :load-toplevel :execute)
344 (setf sb!assem:*assem-scheduler-p* nil))
346 (sb!disassem:define-argument-type condition-code
347 :printer *condition-name-vec*)
349 (defun conditional-opcode (condition)
350 (cdr (assoc condition conditions :test #'eq)))
352 ;;;; disassembler instruction formats
354 (eval-when (:compile-toplevel :execute)
355 (defun swap-if (direction field1 separator field2)
356 `(:if (,direction :constant 0)
357 (,field1 ,separator ,field2)
358 (,field2 ,separator ,field1))))
360 (sb!disassem:define-instruction-format (byte 8 :default-printer '(:name))
361 (op :field (byte 8 0))
366 (sb!disassem:define-instruction-format (simple 8)
367 (op :field (byte 7 1))
368 (width :field (byte 1 0) :type 'width)
373 ;;; Same as simple, but with direction bit
374 (sb!disassem:define-instruction-format (simple-dir 8 :include 'simple)
375 (op :field (byte 6 2))
376 (dir :field (byte 1 1)))
378 ;;; Same as simple, but with the immediate value occurring by default,
379 ;;; and with an appropiate printer.
380 (sb!disassem:define-instruction-format (accum-imm 8
382 :default-printer '(:name
383 :tab accum ", " imm))
384 (imm :type 'imm-data))
386 (sb!disassem:define-instruction-format (reg-no-width 8
387 :default-printer '(:name :tab reg))
388 (op :field (byte 5 3))
389 (reg :field (byte 3 0) :type 'word-reg)
391 (accum :type 'word-accum)
394 ;;; adds a width field to reg-no-width
395 (sb!disassem:define-instruction-format (reg 8
396 :default-printer '(:name :tab reg))
397 (op :field (byte 4 4))
398 (width :field (byte 1 3) :type 'width)
399 (reg :field (byte 3 0) :type 'reg)
405 ;;; Same as reg, but with direction bit
406 (sb!disassem:define-instruction-format (reg-dir 8 :include 'reg)
407 (op :field (byte 3 5))
408 (dir :field (byte 1 4)))
410 (sb!disassem:define-instruction-format (two-bytes 16
411 :default-printer '(:name))
412 (op :fields (list (byte 8 0) (byte 8 8))))
414 (sb!disassem:define-instruction-format (reg-reg/mem 16
416 `(:name :tab reg ", " reg/mem))
417 (op :field (byte 7 1))
418 (width :field (byte 1 0) :type 'width)
419 (reg/mem :fields (list (byte 2 14) (byte 3 8))
421 (reg :field (byte 3 11) :type 'reg)
425 ;;; same as reg-reg/mem, but with direction bit
426 (sb!disassem:define-instruction-format (reg-reg/mem-dir 16
427 :include 'reg-reg/mem
431 ,(swap-if 'dir 'reg/mem ", " 'reg)))
432 (op :field (byte 6 2))
433 (dir :field (byte 1 1)))
435 ;;; Same as reg-rem/mem, but uses the reg field as a second op code.
436 (sb!disassem:define-instruction-format (reg/mem 16
437 :default-printer '(:name :tab reg/mem))
438 (op :fields (list (byte 7 1) (byte 3 11)))
439 (width :field (byte 1 0) :type 'width)
440 (reg/mem :fields (list (byte 2 14) (byte 3 8))
441 :type 'sized-reg/mem)
445 ;;; Same as reg/mem, but with the immediate value occurring by default,
446 ;;; and with an appropiate printer.
447 (sb!disassem:define-instruction-format (reg/mem-imm 16
450 '(:name :tab reg/mem ", " imm))
451 (reg/mem :type 'sized-reg/mem)
452 (imm :type 'imm-data))
454 ;;; Same as reg/mem, but with using the accumulator in the default printer
455 (sb!disassem:define-instruction-format
457 :include 'reg/mem :default-printer '(:name :tab accum ", " reg/mem))
458 (reg/mem :type 'reg/mem) ; don't need a size
459 (accum :type 'accum))
461 ;;; Same as reg-reg/mem, but with a prefix of #b00001111
462 (sb!disassem:define-instruction-format (ext-reg-reg/mem 24
464 `(:name :tab reg ", " reg/mem))
465 (prefix :field (byte 8 0) :value #b00001111)
466 (op :field (byte 7 9))
467 (width :field (byte 1 8) :type 'width)
468 (reg/mem :fields (list (byte 2 22) (byte 3 16))
470 (reg :field (byte 3 19) :type 'reg)
474 ;;; Same as reg/mem, but with a prefix of #b00001111
475 (sb!disassem:define-instruction-format (ext-reg/mem 24
476 :default-printer '(:name :tab reg/mem))
477 (prefix :field (byte 8 0) :value #b00001111)
478 (op :fields (list (byte 7 9) (byte 3 19)))
479 (width :field (byte 1 8) :type 'width)
480 (reg/mem :fields (list (byte 2 22) (byte 3 16))
481 :type 'sized-reg/mem)
485 ;;;; This section was added by jrd, for fp instructions.
487 ;;; regular fp inst to/from registers/memory
488 (sb!disassem:define-instruction-format (floating-point 16
490 `(:name :tab reg/mem))
491 (prefix :field (byte 5 3) :value #b11011)
492 (op :fields (list (byte 3 0) (byte 3 11)))
493 (reg/mem :fields (list (byte 2 14) (byte 3 8)) :type 'reg/mem))
495 ;;; fp insn to/from fp reg
496 (sb!disassem:define-instruction-format (floating-point-fp 16
497 :default-printer `(:name :tab fp-reg))
498 (prefix :field (byte 5 3) :value #b11011)
499 (suffix :field (byte 2 14) :value #b11)
500 (op :fields (list (byte 3 0) (byte 3 11)))
501 (fp-reg :field (byte 3 8) :type 'fp-reg))
503 ;;; fp insn to/from fp reg, with the reversed source/destination flag.
504 (sb!disassem:define-instruction-format
505 (floating-point-fp-d 16
506 :default-printer `(:name :tab ,(swap-if 'd "ST0" ", " 'fp-reg)))
507 (prefix :field (byte 5 3) :value #b11011)
508 (suffix :field (byte 2 14) :value #b11)
509 (op :fields (list (byte 2 0) (byte 3 11)))
510 (d :field (byte 1 2))
511 (fp-reg :field (byte 3 8) :type 'fp-reg))
514 ;;; (added by (?) pfw)
515 ;;; fp no operand isns
516 (sb!disassem:define-instruction-format (floating-point-no 16
517 :default-printer '(:name))
518 (prefix :field (byte 8 0) :value #b11011001)
519 (suffix :field (byte 3 13) :value #b111)
520 (op :field (byte 5 8)))
522 (sb!disassem:define-instruction-format (floating-point-3 16
523 :default-printer '(:name))
524 (prefix :field (byte 5 3) :value #b11011)
525 (suffix :field (byte 2 14) :value #b11)
526 (op :fields (list (byte 3 0) (byte 6 8))))
528 (sb!disassem:define-instruction-format (floating-point-5 16
529 :default-printer '(:name))
530 (prefix :field (byte 8 0) :value #b11011011)
531 (suffix :field (byte 3 13) :value #b111)
532 (op :field (byte 5 8)))
534 (sb!disassem:define-instruction-format (floating-point-st 16
535 :default-printer '(:name))
536 (prefix :field (byte 8 0) :value #b11011111)
537 (suffix :field (byte 3 13) :value #b111)
538 (op :field (byte 5 8)))
540 (sb!disassem:define-instruction-format (string-op 8
542 :default-printer '(:name width)))
544 (sb!disassem:define-instruction-format (short-cond-jump 16)
545 (op :field (byte 4 4))
546 (cc :field (byte 4 0) :type 'condition-code)
547 (label :field (byte 8 8) :type 'displacement))
549 (sb!disassem:define-instruction-format (short-jump 16
550 :default-printer '(:name :tab label))
551 (const :field (byte 4 4) :value #b1110)
552 (op :field (byte 4 0))
553 (label :field (byte 8 8) :type 'displacement))
555 (sb!disassem:define-instruction-format (near-cond-jump 16)
556 (op :fields (list (byte 8 0) (byte 4 12)) :value '(#b00001111 #b1000))
557 (cc :field (byte 4 8) :type 'condition-code)
558 ;; The disassembler currently doesn't let you have an instruction > 32 bits
559 ;; long, so we fake it by using a prefilter to read the offset.
560 (label :type 'displacement
561 :prefilter #'(lambda (value dstate)
562 (declare (ignore value)) ; always nil anyway
563 (sb!disassem:read-signed-suffix 32 dstate))))
565 (sb!disassem:define-instruction-format (near-jump 8
566 :default-printer '(:name :tab label))
567 (op :field (byte 8 0))
568 ;; The disassembler currently doesn't let you have an instruction > 32 bits
569 ;; long, so we fake it by using a prefilter to read the address.
570 (label :type 'displacement
571 :prefilter #'(lambda (value dstate)
572 (declare (ignore value)) ; always nil anyway
573 (sb!disassem:read-signed-suffix 32 dstate))))
576 (sb!disassem:define-instruction-format (cond-set 24
577 :default-printer '('set cc :tab reg/mem))
578 (prefix :field (byte 8 0) :value #b00001111)
579 (op :field (byte 4 12) :value #b1001)
580 (cc :field (byte 4 8) :type 'condition-code)
581 (reg/mem :fields (list (byte 2 22) (byte 3 16))
583 (reg :field (byte 3 19) :value #b000))
585 (sb!disassem:define-instruction-format (enter-format 32
586 :default-printer '(:name
588 (:unless (:constant 0)
590 (op :field (byte 8 0))
591 (disp :field (byte 16 8))
592 (level :field (byte 8 24)))
594 ;;; Single byte instruction with an immediate byte argument.
595 (sb!disassem:define-instruction-format (byte-imm 16
596 :default-printer '(:name :tab code))
597 (op :field (byte 8 0))
598 (code :field (byte 8 8)))
600 ;;;; primitive emitters
602 (define-bitfield-emitter emit-word 16
605 (define-bitfield-emitter emit-dword 32
608 (define-bitfield-emitter emit-byte-with-reg 8
609 (byte 5 3) (byte 3 0))
611 (define-bitfield-emitter emit-mod-reg-r/m-byte 8
612 (byte 2 6) (byte 3 3) (byte 3 0))
614 (define-bitfield-emitter emit-sib-byte 8
615 (byte 2 6) (byte 3 3) (byte 3 0))
619 (defun emit-absolute-fixup (segment fixup)
620 (note-fixup segment :absolute fixup)
621 (let ((offset (fixup-offset fixup)))
623 (emit-back-patch segment
624 4 ; FIXME: sb!vm:word-bytes
625 #'(lambda (segment posn)
626 (declare (ignore posn))
628 (- (+ (component-header-length)
629 (or (label-position offset)
631 other-pointer-type))))
632 (emit-dword segment (or offset 0)))))
634 (defun emit-relative-fixup (segment fixup)
635 (note-fixup segment :relative fixup)
636 (emit-dword segment (or (fixup-offset fixup) 0)))
638 ;;;; the effective-address (ea) structure
640 (defun reg-tn-encoding (tn)
641 (declare (type tn tn))
642 (assert (eq (sb-name (sc-sb (tn-sc tn))) 'registers))
643 (let ((offset (tn-offset tn)))
644 (logior (ash (logand offset 1) 2)
647 (defstruct (ea (:constructor make-ea (size &key base index scale disp)))
648 (size nil :type (member :byte :word :dword))
649 (base nil :type (or tn null))
650 (index nil :type (or tn null))
651 (scale 1 :type (member 1 2 4 8))
652 (disp 0 :type (or (signed-byte 32) fixup)))
653 (def!method print-object ((ea ea) stream)
654 (cond ((or *print-escape* *print-readably*)
655 (print-unreadable-object (ea stream :type t)
657 "~S~@[ base=~S~]~@[ index=~S~]~@[ scale=~S~]~@[ disp=~S~]"
661 (let ((scale (ea-scale ea)))
662 (if (= scale 1) nil scale))
665 (format stream "~A PTR [" (symbol-name (ea-size ea)))
667 (write-string (x86-location-print-name (ea-base ea)) stream)
669 (write-string "+" stream)))
671 (write-string (x86-location-print-name (ea-index ea)) stream))
672 (unless (= (ea-scale ea) 1)
673 (format stream "*~A" (ea-scale ea)))
674 (typecase (ea-disp ea)
677 (format stream "~@D" (ea-disp ea)))
679 (format stream "+~A" (ea-disp ea))))
680 (write-char #\] stream))))
682 (defun emit-ea (segment thing reg &optional allow-constants)
685 (ecase (sb-name (sc-sb (tn-sc thing)))
687 (emit-mod-reg-r/m-byte segment #b11 reg (reg-tn-encoding thing)))
689 ;; Convert stack tns into an index off of EBP.
690 (let ((disp (- (* (1+ (tn-offset thing)) word-bytes))))
691 (cond ((< -128 disp 127)
692 (emit-mod-reg-r/m-byte segment #b01 reg #b101)
693 (emit-byte segment disp))
695 (emit-mod-reg-r/m-byte segment #b10 reg #b101)
696 (emit-dword segment disp)))))
698 (unless allow-constants
700 "Constant TNs can only be directly used in MOV, PUSH, and CMP."))
701 (emit-mod-reg-r/m-byte segment #b00 reg #b101)
702 (emit-absolute-fixup segment
705 (- (* (tn-offset thing) word-bytes)
706 other-pointer-type))))))
708 (let* ((base (ea-base thing))
709 (index (ea-index thing))
710 (scale (ea-scale thing))
711 (disp (ea-disp thing))
712 (mod (cond ((or (null base)
714 (not (= (reg-tn-encoding base) #b101))))
716 ((and (target-fixnump disp) (<= -128 disp 127))
720 (r/m (cond (index #b100)
722 (t (reg-tn-encoding base)))))
723 (emit-mod-reg-r/m-byte segment mod reg r/m)
725 (let ((ss (1- (integer-length scale)))
726 (index (if (null index)
728 (let ((index (reg-tn-encoding index)))
730 (error "can't index off of ESP")
732 (base (if (null base)
734 (reg-tn-encoding base))))
735 (emit-sib-byte segment ss index base)))
737 (emit-byte segment disp))
738 ((or (= mod #b10) (null base))
740 (emit-absolute-fixup segment disp)
741 (emit-dword segment disp))))))
743 (emit-mod-reg-r/m-byte segment #b00 reg #b101)
744 (emit-absolute-fixup segment thing))))
746 (defun fp-reg-tn-p (thing)
748 (eq (sb-name (sc-sb (tn-sc thing))) 'float-registers)))
750 ;;; like the above, but for fp-instructions--jrd
751 (defun emit-fp-op (segment thing op)
752 (if (fp-reg-tn-p thing)
753 (emit-byte segment (dpb op (byte 3 3) (dpb (tn-offset thing)
756 (emit-ea segment thing op)))
758 (defun byte-reg-p (thing)
760 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)
761 (member (sc-name (tn-sc thing)) byte-sc-names)
764 (defun byte-ea-p (thing)
766 (ea (eq (ea-size thing) :byte))
768 (and (member (sc-name (tn-sc thing)) byte-sc-names) t))
771 (defun word-reg-p (thing)
773 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)
774 (member (sc-name (tn-sc thing)) word-sc-names)
777 (defun word-ea-p (thing)
779 (ea (eq (ea-size thing) :word))
780 (tn (and (member (sc-name (tn-sc thing)) word-sc-names) t))
783 (defun dword-reg-p (thing)
785 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)
786 (member (sc-name (tn-sc thing)) dword-sc-names)
789 (defun dword-ea-p (thing)
791 (ea (eq (ea-size thing) :dword))
793 (and (member (sc-name (tn-sc thing)) dword-sc-names) t))
796 (defun register-p (thing)
798 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)))
800 (defun accumulator-p (thing)
801 (and (register-p thing)
802 (= (tn-offset thing) 0)))
806 (defconstant +operand-size-prefix-byte+ #b01100110)
808 (defconstant +default-operand-size+ :dword)
810 (defun maybe-emit-operand-size-prefix (segment size)
811 (unless (or (eq size :byte) (eq size +default-operand-size+))
812 (emit-byte segment +operand-size-prefix-byte+)))
814 (defun operand-size (thing)
817 (case (sc-name (tn-sc thing))
824 ;; added by jrd. float-registers is a separate size (?)
830 (error "can't tell the size of ~S ~S" thing (sc-name (tn-sc thing))))))
836 (defun matching-operand-size (dst src)
837 (let ((dst-size (operand-size dst))
838 (src-size (operand-size src)))
841 (if (eq dst-size src-size)
843 (error "size mismatch: ~S is a ~S and ~S is a ~S."
844 dst dst-size src src-size))
848 (error "can't tell the size of either ~S or ~S" dst src)))))
850 (defun emit-sized-immediate (segment size value)
853 (emit-byte segment value))
855 (emit-word segment value))
857 (emit-dword segment value))))
859 ;;;; general data transfer
861 (define-instruction mov (segment dst src)
862 ;; immediate to register
863 (:printer reg ((op #b1011) (imm nil :type 'imm-data))
864 '(:name :tab reg ", " imm))
865 ;; absolute mem to/from accumulator
866 (:printer simple-dir ((op #b101000) (imm nil :type 'imm-addr))
867 `(:name :tab ,(swap-if 'dir 'accum ", " '("[" imm "]"))))
868 ;; register to/from register/memory
869 (:printer reg-reg/mem-dir ((op #b100010)))
870 ;; immediate to register/memory
871 (:printer reg/mem-imm ((op '(#b1100011 #b000))))
874 (let ((size (matching-operand-size dst src)))
875 (maybe-emit-operand-size-prefix segment size)
876 (cond ((register-p dst)
877 (cond ((integerp src)
878 (emit-byte-with-reg segment
882 (reg-tn-encoding dst))
883 (emit-sized-immediate segment size src))
884 ((and (fixup-p src) (accumulator-p dst))
889 (emit-absolute-fixup segment src))
895 (emit-ea segment src (reg-tn-encoding dst) t))))
896 ((and (fixup-p dst) (accumulator-p src))
897 (emit-byte segment (if (eq size :byte) #b10100010 #b10100011))
898 (emit-absolute-fixup segment dst))
900 (emit-byte segment (if (eq size :byte) #b11000110 #b11000111))
901 (emit-ea segment dst #b000)
902 (emit-sized-immediate segment size src))
904 (emit-byte segment (if (eq size :byte) #b10001000 #b10001001))
905 (emit-ea segment dst (reg-tn-encoding src)))
907 (assert (eq size :dword))
908 (emit-byte segment #b11000111)
909 (emit-ea segment dst #b000)
910 (emit-absolute-fixup segment src))
912 (error "bogus arguments to MOV: ~S ~S" dst src))))))
914 (defun emit-move-with-extension (segment dst src opcode)
915 (assert (register-p dst))
916 (let ((dst-size (operand-size dst))
917 (src-size (operand-size src)))
920 (assert (eq src-size :byte))
921 (maybe-emit-operand-size-prefix segment :word)
922 (emit-byte segment #b00001111)
923 (emit-byte segment opcode)
924 (emit-ea segment src (reg-tn-encoding dst)))
928 (maybe-emit-operand-size-prefix segment :dword)
929 (emit-byte segment #b00001111)
930 (emit-byte segment opcode)
931 (emit-ea segment src (reg-tn-encoding dst)))
933 (emit-byte segment #b00001111)
934 (emit-byte segment (logior opcode 1))
935 (emit-ea segment src (reg-tn-encoding dst))))))))
937 (define-instruction movsx (segment dst src)
938 (:printer ext-reg-reg/mem ((op #b1011111) (reg nil :type 'word-reg)))
939 (:emitter (emit-move-with-extension segment dst src #b10111110)))
941 (define-instruction movzx (segment dst src)
942 (:printer ext-reg-reg/mem ((op #b1011011) (reg nil :type 'word-reg)))
943 (:emitter (emit-move-with-extension segment dst src #b10110110)))
945 (define-instruction push (segment src)
947 (:printer reg-no-width ((op #b01010)))
949 (:printer reg/mem ((op '(#b1111111 #b110)) (width 1)))
951 (:printer byte ((op #b01101010) (imm nil :type 'signed-imm-byte))
953 (:printer byte ((op #b01101000) (imm nil :type 'imm-word))
955 ;; ### segment registers?
958 (cond ((integerp src)
959 (cond ((<= -128 src 127)
960 (emit-byte segment #b01101010)
961 (emit-byte segment src))
963 (emit-byte segment #b01101000)
964 (emit-dword segment src))))
966 ;; Interpret the fixup as an immediate dword to push.
967 (emit-byte segment #b01101000)
968 (emit-absolute-fixup segment src))
970 (let ((size (operand-size src)))
971 (assert (not (eq size :byte)))
972 (maybe-emit-operand-size-prefix segment size)
973 (cond ((register-p src)
974 (emit-byte-with-reg segment #b01010 (reg-tn-encoding src)))
976 (emit-byte segment #b11111111)
977 (emit-ea segment src #b110 t))))))))
979 (define-instruction pusha (segment)
980 (:printer byte ((op #b01100000)))
982 (emit-byte segment #b01100000)))
984 (define-instruction pop (segment dst)
985 (:printer reg-no-width ((op #b01011)))
986 (:printer reg/mem ((op '(#b1000111 #b000)) (width 1)))
988 (let ((size (operand-size dst)))
989 (assert (not (eq size :byte)))
990 (maybe-emit-operand-size-prefix segment size)
991 (cond ((register-p dst)
992 (emit-byte-with-reg segment #b01011 (reg-tn-encoding dst)))
994 (emit-byte segment #b10001111)
995 (emit-ea segment dst #b000))))))
997 (define-instruction popa (segment)
998 (:printer byte ((op #b01100001)))
1000 (emit-byte segment #b01100001)))
1002 (define-instruction xchg (segment operand1 operand2)
1003 ;; Register with accumulator.
1004 (:printer reg-no-width ((op #b10010)) '(:name :tab accum ", " reg))
1005 ;; Register/Memory with Register.
1006 (:printer reg-reg/mem ((op #b1000011)))
1008 (let ((size (matching-operand-size operand1 operand2)))
1009 (maybe-emit-operand-size-prefix segment size)
1010 (labels ((xchg-acc-with-something (acc something)
1011 (if (and (not (eq size :byte)) (register-p something))
1012 (emit-byte-with-reg segment
1014 (reg-tn-encoding something))
1015 (xchg-reg-with-something acc something)))
1016 (xchg-reg-with-something (reg something)
1017 (emit-byte segment (if (eq size :byte) #b10000110 #b10000111))
1018 (emit-ea segment something (reg-tn-encoding reg))))
1019 (cond ((accumulator-p operand1)
1020 (xchg-acc-with-something operand1 operand2))
1021 ((accumulator-p operand2)
1022 (xchg-acc-with-something operand2 operand1))
1023 ((register-p operand1)
1024 (xchg-reg-with-something operand1 operand2))
1025 ((register-p operand2)
1026 (xchg-reg-with-something operand2 operand1))
1028 (error "bogus args to XCHG: ~S ~S" operand1 operand2)))))))
1030 (define-instruction lea (segment dst src)
1031 (:printer reg-reg/mem ((op #b1000110) (width 1)))
1033 (assert (dword-reg-p dst))
1034 (emit-byte segment #b10001101)
1035 (emit-ea segment src (reg-tn-encoding dst))))
1037 (define-instruction cmpxchg (segment dst src)
1038 ;; Register/Memory with Register.
1039 (:printer ext-reg-reg/mem ((op #b1011000)) '(:name :tab reg/mem ", " reg))
1041 (assert (register-p src))
1042 (let ((size (matching-operand-size src dst)))
1043 (maybe-emit-operand-size-prefix segment size)
1044 (emit-byte segment #b00001111)
1045 (emit-byte segment (if (eq size :byte) #b10110000 #b10110001))
1046 (emit-ea segment dst (reg-tn-encoding src)))))
1049 ;;;; flag control instructions
1051 ;;; CLC -- Clear Carry Flag.
1052 (define-instruction clc (segment)
1053 (:printer byte ((op #b11111000)))
1055 (emit-byte segment #b11111000)))
1057 ;;; CLD -- Clear Direction Flag.
1058 (define-instruction cld (segment)
1059 (:printer byte ((op #b11111100)))
1061 (emit-byte segment #b11111100)))
1063 ;;; CLI -- Clear Iterrupt Enable Flag.
1064 (define-instruction cli (segment)
1065 (:printer byte ((op #b11111010)))
1067 (emit-byte segment #b11111010)))
1069 ;;; CMC -- Complement Carry Flag.
1070 (define-instruction cmc (segment)
1071 (:printer byte ((op #b11110101)))
1073 (emit-byte segment #b11110101)))
1075 ;;; LAHF -- Load AH into flags.
1076 (define-instruction lahf (segment)
1077 (:printer byte ((op #b10011111)))
1079 (emit-byte segment #b10011111)))
1081 ;;; POPF -- Pop flags.
1082 (define-instruction popf (segment)
1083 (:printer byte ((op #b10011101)))
1085 (emit-byte segment #b10011101)))
1087 ;;; PUSHF -- push flags.
1088 (define-instruction pushf (segment)
1089 (:printer byte ((op #b10011100)))
1091 (emit-byte segment #b10011100)))
1093 ;;; SAHF -- Store AH into flags.
1094 (define-instruction sahf (segment)
1095 (:printer byte ((op #b10011110)))
1097 (emit-byte segment #b10011110)))
1099 ;;; STC -- Set Carry Flag.
1100 (define-instruction stc (segment)
1101 (:printer byte ((op #b11111001)))
1103 (emit-byte segment #b11111001)))
1105 ;;; STD -- Set Direction Flag.
1106 (define-instruction std (segment)
1107 (:printer byte ((op #b11111101)))
1109 (emit-byte segment #b11111101)))
1111 ;;; STI -- Set Interrupt Enable Flag.
1112 (define-instruction sti (segment)
1113 (:printer byte ((op #b11111011)))
1115 (emit-byte segment #b11111011)))
1119 (defun emit-random-arith-inst (name segment dst src opcode
1120 &optional allow-constants)
1121 (let ((size (matching-operand-size dst src)))
1122 (maybe-emit-operand-size-prefix segment size)
1125 (cond ((and (not (eq size :byte)) (<= -128 src 127))
1126 (emit-byte segment #b10000011)
1127 (emit-ea segment dst opcode)
1128 (emit-byte segment src))
1129 ((accumulator-p dst)
1136 (emit-sized-immediate segment size src))
1138 (emit-byte segment (if (eq size :byte) #b10000000 #b10000001))
1139 (emit-ea segment dst opcode)
1140 (emit-sized-immediate segment size src))))
1145 (if (eq size :byte) #b00000000 #b00000001)))
1146 (emit-ea segment dst (reg-tn-encoding src) allow-constants))
1151 (if (eq size :byte) #b00000010 #b00000011)))
1152 (emit-ea segment src (reg-tn-encoding dst) allow-constants))
1154 (error "bogus operands to ~A" name)))))
1156 (eval-when (:compile-toplevel :execute)
1157 (defun arith-inst-printer-list (subop)
1158 `((accum-imm ((op ,(dpb subop (byte 3 2) #b0000010))))
1159 (reg/mem-imm ((op (#b1000000 ,subop))))
1160 (reg/mem-imm ((op (#b1000001 ,subop))
1161 (imm nil :type signed-imm-byte)))
1162 (reg-reg/mem-dir ((op ,(dpb subop (byte 3 1) #b000000))))))
1165 (define-instruction add (segment dst src)
1166 (:printer-list (arith-inst-printer-list #b000))
1167 (:emitter (emit-random-arith-inst "ADD" segment dst src #b000)))
1169 (define-instruction adc (segment dst src)
1170 (:printer-list (arith-inst-printer-list #b010))
1171 (:emitter (emit-random-arith-inst "ADC" segment dst src #b010)))
1173 (define-instruction sub (segment dst src)
1174 (:printer-list (arith-inst-printer-list #b101))
1175 (:emitter (emit-random-arith-inst "SUB" segment dst src #b101)))
1177 (define-instruction sbb (segment dst src)
1178 (:printer-list (arith-inst-printer-list #b011))
1179 (:emitter (emit-random-arith-inst "SBB" segment dst src #b011)))
1181 (define-instruction cmp (segment dst src)
1182 (:printer-list (arith-inst-printer-list #b111))
1183 (:emitter (emit-random-arith-inst "CMP" segment dst src #b111 t)))
1185 (define-instruction inc (segment dst)
1187 (:printer reg-no-width ((op #b01000)))
1189 (:printer reg/mem ((op '(#b1111111 #b000))))
1191 (let ((size (operand-size dst)))
1192 (maybe-emit-operand-size-prefix segment size)
1193 (cond ((and (not (eq size :byte)) (register-p dst))
1194 (emit-byte-with-reg segment #b01000 (reg-tn-encoding dst)))
1196 (emit-byte segment (if (eq size :byte) #b11111110 #b11111111))
1197 (emit-ea segment dst #b000))))))
1199 (define-instruction dec (segment dst)
1201 (:printer reg-no-width ((op #b01001)))
1203 (:printer reg/mem ((op '(#b1111111 #b001))))
1205 (let ((size (operand-size dst)))
1206 (maybe-emit-operand-size-prefix segment size)
1207 (cond ((and (not (eq size :byte)) (register-p dst))
1208 (emit-byte-with-reg segment #b01001 (reg-tn-encoding dst)))
1210 (emit-byte segment (if (eq size :byte) #b11111110 #b11111111))
1211 (emit-ea segment dst #b001))))))
1213 (define-instruction neg (segment dst)
1214 (:printer reg/mem ((op '(#b1111011 #b011))))
1216 (let ((size (operand-size dst)))
1217 (maybe-emit-operand-size-prefix segment size)
1218 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1219 (emit-ea segment dst #b011))))
1221 (define-instruction aaa (segment)
1222 (:printer byte ((op #b00110111)))
1224 (emit-byte segment #b00110111)))
1226 (define-instruction aas (segment)
1227 (:printer byte ((op #b00111111)))
1229 (emit-byte segment #b00111111)))
1231 (define-instruction daa (segment)
1232 (:printer byte ((op #b00100111)))
1234 (emit-byte segment #b00100111)))
1236 (define-instruction das (segment)
1237 (:printer byte ((op #b00101111)))
1239 (emit-byte segment #b00101111)))
1241 (define-instruction mul (segment dst src)
1242 (:printer accum-reg/mem ((op '(#b1111011 #b100))))
1244 (let ((size (matching-operand-size dst src)))
1245 (assert (accumulator-p dst))
1246 (maybe-emit-operand-size-prefix segment size)
1247 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1248 (emit-ea segment src #b100))))
1250 (define-instruction imul (segment dst &optional src1 src2)
1251 (:printer accum-reg/mem ((op '(#b1111011 #b101))))
1252 (:printer ext-reg-reg/mem ((op #b1010111)))
1253 (:printer reg-reg/mem ((op #b0110100) (width 1) (imm nil :type 'imm-word))
1254 '(:name :tab reg ", " reg/mem ", " imm))
1255 (:printer reg-reg/mem ((op #b0110101) (width 1)
1256 (imm nil :type 'signed-imm-byte))
1257 '(:name :tab reg ", " reg/mem ", " imm))
1259 (flet ((r/m-with-immed-to-reg (reg r/m immed)
1260 (let* ((size (matching-operand-size reg r/m))
1261 (sx (and (not (eq size :byte)) (<= -128 immed 127))))
1262 (maybe-emit-operand-size-prefix segment size)
1263 (emit-byte segment (if sx #b01101011 #b01101001))
1264 (emit-ea segment r/m (reg-tn-encoding reg))
1266 (emit-byte segment immed)
1267 (emit-sized-immediate segment size immed)))))
1269 (r/m-with-immed-to-reg dst src1 src2))
1272 (r/m-with-immed-to-reg dst dst src1)
1273 (let ((size (matching-operand-size dst src1)))
1274 (maybe-emit-operand-size-prefix segment size)
1275 (emit-byte segment #b00001111)
1276 (emit-byte segment #b10101111)
1277 (emit-ea segment src1 (reg-tn-encoding dst)))))
1279 (let ((size (operand-size dst)))
1280 (maybe-emit-operand-size-prefix segment size)
1281 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1282 (emit-ea segment dst #b101)))))))
1284 (define-instruction div (segment dst src)
1285 (:printer accum-reg/mem ((op '(#b1111011 #b110))))
1287 (let ((size (matching-operand-size dst src)))
1288 (assert (accumulator-p dst))
1289 (maybe-emit-operand-size-prefix segment size)
1290 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1291 (emit-ea segment src #b110))))
1293 (define-instruction idiv (segment dst src)
1294 (:printer accum-reg/mem ((op '(#b1111011 #b111))))
1296 (let ((size (matching-operand-size dst src)))
1297 (assert (accumulator-p dst))
1298 (maybe-emit-operand-size-prefix segment size)
1299 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1300 (emit-ea segment src #b111))))
1302 (define-instruction aad (segment)
1303 (:printer two-bytes ((op '(#b11010101 #b00001010))))
1305 (emit-byte segment #b11010101)
1306 (emit-byte segment #b00001010)))
1308 (define-instruction aam (segment)
1309 (:printer two-bytes ((op '(#b11010100 #b00001010))))
1311 (emit-byte segment #b11010100)
1312 (emit-byte segment #b00001010)))
1314 ;;; CBW -- Convert Byte to Word. AX <- sign_xtnd(AL)
1315 (define-instruction cbw (segment)
1317 (maybe-emit-operand-size-prefix segment :word)
1318 (emit-byte segment #b10011000)))
1320 ;;; CWDE -- Convert Word To Double Word Extened. EAX <- sign_xtnd(AX)
1321 (define-instruction cwde (segment)
1323 (maybe-emit-operand-size-prefix segment :dword)
1324 (emit-byte segment #b10011000)))
1326 ;;; CWD -- Convert Word to Double Word. DX:AX <- sign_xtnd(AX)
1327 (define-instruction cwd (segment)
1329 (maybe-emit-operand-size-prefix segment :word)
1330 (emit-byte segment #b10011001)))
1332 ;;; CDQ -- Convert Double Word to Quad Word. EDX:EAX <- sign_xtnd(EAX)
1333 (define-instruction cdq (segment)
1334 (:printer byte ((op #b10011001)))
1336 (maybe-emit-operand-size-prefix segment :dword)
1337 (emit-byte segment #b10011001)))
1339 (define-instruction xadd (segment dst src)
1340 ;; Register/Memory with Register.
1341 (:printer ext-reg-reg/mem ((op #b1100000)) '(:name :tab reg/mem ", " reg))
1343 (assert (register-p src))
1344 (let ((size (matching-operand-size src dst)))
1345 (maybe-emit-operand-size-prefix segment size)
1346 (emit-byte segment #b00001111)
1347 (emit-byte segment (if (eq size :byte) #b11000000 #b11000001))
1348 (emit-ea segment dst (reg-tn-encoding src)))))
1353 (defun emit-shift-inst (segment dst amount opcode)
1354 (let ((size (operand-size dst)))
1355 (maybe-emit-operand-size-prefix segment size)
1356 (multiple-value-bind (major-opcode immed)
1358 (:cl (values #b11010010 nil))
1359 (1 (values #b11010000 nil))
1360 (t (values #b11000000 t)))
1362 (if (eq size :byte) major-opcode (logior major-opcode 1)))
1363 (emit-ea segment dst opcode)
1365 (emit-byte segment amount)))))
1367 (eval-when (:compile-toplevel :execute)
1368 (defun shift-inst-printer-list (subop)
1369 `((reg/mem ((op (#b1101000 ,subop)))
1370 (:name :tab reg/mem ", 1"))
1371 (reg/mem ((op (#b1101001 ,subop)))
1372 (:name :tab reg/mem ", " 'cl))
1373 (reg/mem-imm ((op (#b1100000 ,subop))
1374 (imm nil :type signed-imm-byte))))))
1376 (define-instruction rol (segment dst amount)
1378 (shift-inst-printer-list #b000))
1380 (emit-shift-inst segment dst amount #b000)))
1382 (define-instruction ror (segment dst amount)
1384 (shift-inst-printer-list #b001))
1386 (emit-shift-inst segment dst amount #b001)))
1388 (define-instruction rcl (segment dst amount)
1390 (shift-inst-printer-list #b010))
1392 (emit-shift-inst segment dst amount #b010)))
1394 (define-instruction rcr (segment dst amount)
1396 (shift-inst-printer-list #b011))
1398 (emit-shift-inst segment dst amount #b011)))
1400 (define-instruction shl (segment dst amount)
1402 (shift-inst-printer-list #b100))
1404 (emit-shift-inst segment dst amount #b100)))
1406 (define-instruction shr (segment dst amount)
1408 (shift-inst-printer-list #b101))
1410 (emit-shift-inst segment dst amount #b101)))
1412 (define-instruction sar (segment dst amount)
1414 (shift-inst-printer-list #b111))
1416 (emit-shift-inst segment dst amount #b111)))
1418 (defun emit-double-shift (segment opcode dst src amt)
1419 (let ((size (matching-operand-size dst src)))
1420 (when (eq size :byte)
1421 (error "Double shifts can only be used with words."))
1422 (maybe-emit-operand-size-prefix segment size)
1423 (emit-byte segment #b00001111)
1424 (emit-byte segment (dpb opcode (byte 1 3)
1425 (if (eq amt :cl) #b10100101 #b10100100)))
1427 (emit-ea segment dst src)
1428 (emit-ea segment dst (reg-tn-encoding src)) ; pw tries this
1429 (unless (eq amt :cl)
1430 (emit-byte segment amt))))
1432 (eval-when (:compile-toplevel :execute)
1433 (defun double-shift-inst-printer-list (op)
1435 (ext-reg-reg/mem-imm ((op ,(logior op #b100))
1436 (imm nil :type signed-imm-byte)))
1437 (ext-reg-reg/mem ((op ,(logior op #b101)))
1438 (:name :tab reg/mem ", " 'cl)))))
1440 (define-instruction shld (segment dst src amt)
1441 (:declare (type (or (member :cl) (mod 32)) amt))
1442 (:printer-list (double-shift-inst-printer-list #b10100000))
1444 (emit-double-shift segment #b0 dst src amt)))
1446 (define-instruction shrd (segment dst src amt)
1447 (:declare (type (or (member :cl) (mod 32)) amt))
1448 (:printer-list (double-shift-inst-printer-list #b10101000))
1450 (emit-double-shift segment #b1 dst src amt)))
1452 (define-instruction and (segment dst src)
1454 (arith-inst-printer-list #b100))
1456 (emit-random-arith-inst "AND" segment dst src #b100)))
1458 (define-instruction test (segment this that)
1459 (:printer accum-imm ((op #b1010100)))
1460 (:printer reg/mem-imm ((op '(#b1111011 #b000))))
1461 (:printer reg-reg/mem ((op #b1000010)))
1463 (let ((size (matching-operand-size this that)))
1464 (maybe-emit-operand-size-prefix segment size)
1465 (flet ((test-immed-and-something (immed something)
1466 (cond ((accumulator-p something)
1468 (if (eq size :byte) #b10101000 #b10101001))
1469 (emit-sized-immediate segment size immed))
1472 (if (eq size :byte) #b11110110 #b11110111))
1473 (emit-ea segment something #b000)
1474 (emit-sized-immediate segment size immed))))
1475 (test-reg-and-something (reg something)
1476 (emit-byte segment (if (eq size :byte) #b10000100 #b10000101))
1477 (emit-ea segment something (reg-tn-encoding reg))))
1478 (cond ((integerp that)
1479 (test-immed-and-something that this))
1481 (test-immed-and-something this that))
1483 (test-reg-and-something this that))
1485 (test-reg-and-something that this))
1487 (error "bogus operands for TEST: ~S and ~S" this that)))))))
1489 (define-instruction or (segment dst src)
1491 (arith-inst-printer-list #b001))
1493 (emit-random-arith-inst "OR" segment dst src #b001)))
1495 (define-instruction xor (segment dst src)
1497 (arith-inst-printer-list #b110))
1499 (emit-random-arith-inst "XOR" segment dst src #b110)))
1501 (define-instruction not (segment dst)
1502 (:printer reg/mem ((op '(#b1111011 #b010))))
1504 (let ((size (operand-size dst)))
1505 (maybe-emit-operand-size-prefix segment size)
1506 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1507 (emit-ea segment dst #b010))))
1509 ;;;; string manipulation
1511 (define-instruction cmps (segment size)
1512 (:printer string-op ((op #b1010011)))
1514 (maybe-emit-operand-size-prefix segment size)
1515 (emit-byte segment (if (eq size :byte) #b10100110 #b10100111))))
1517 (define-instruction ins (segment acc)
1518 (:printer string-op ((op #b0110110)))
1520 (let ((size (operand-size acc)))
1521 (assert (accumulator-p acc))
1522 (maybe-emit-operand-size-prefix segment size)
1523 (emit-byte segment (if (eq size :byte) #b01101100 #b01101101)))))
1525 (define-instruction lods (segment acc)
1526 (:printer string-op ((op #b1010110)))
1528 (let ((size (operand-size acc)))
1529 (assert (accumulator-p acc))
1530 (maybe-emit-operand-size-prefix segment size)
1531 (emit-byte segment (if (eq size :byte) #b10101100 #b10101101)))))
1533 (define-instruction movs (segment size)
1534 (:printer string-op ((op #b1010010)))
1536 (maybe-emit-operand-size-prefix segment size)
1537 (emit-byte segment (if (eq size :byte) #b10100100 #b10100101))))
1539 (define-instruction outs (segment acc)
1540 (:printer string-op ((op #b0110111)))
1542 (let ((size (operand-size acc)))
1543 (assert (accumulator-p acc))
1544 (maybe-emit-operand-size-prefix segment size)
1545 (emit-byte segment (if (eq size :byte) #b01101110 #b01101111)))))
1547 (define-instruction scas (segment acc)
1548 (:printer string-op ((op #b1010111)))
1550 (let ((size (operand-size acc)))
1551 (assert (accumulator-p acc))
1552 (maybe-emit-operand-size-prefix segment size)
1553 (emit-byte segment (if (eq size :byte) #b10101110 #b10101111)))))
1555 (define-instruction stos (segment acc)
1556 (:printer string-op ((op #b1010101)))
1558 (let ((size (operand-size acc)))
1559 (assert (accumulator-p acc))
1560 (maybe-emit-operand-size-prefix segment size)
1561 (emit-byte segment (if (eq size :byte) #b10101010 #b10101011)))))
1563 (define-instruction xlat (segment)
1564 (:printer byte ((op #b11010111)))
1566 (emit-byte segment #b11010111)))
1568 (define-instruction rep (segment)
1570 (emit-byte segment #b11110010)))
1572 (define-instruction repe (segment)
1573 (:printer byte ((op #b11110011)))
1575 (emit-byte segment #b11110011)))
1577 (define-instruction repne (segment)
1578 (:printer byte ((op #b11110010)))
1580 (emit-byte segment #b11110010)))
1583 ;;;; bit manipulation
1585 (define-instruction bsf (segment dst src)
1587 (let ((size (matching-operand-size dst src)))
1588 (when (eq size :byte)
1589 (error "can't scan bytes: ~S" src))
1590 (maybe-emit-operand-size-prefix segment size)
1591 (emit-byte segment #b00001111)
1592 (emit-byte segment #b10111100)
1593 (emit-ea segment src (reg-tn-encoding dst)))))
1595 (define-instruction bsr (segment dst src)
1597 (let ((size (matching-operand-size dst src)))
1598 (when (eq size :byte)
1599 (error "can't scan bytes: ~S" src))
1600 (maybe-emit-operand-size-prefix segment size)
1601 (emit-byte segment #b00001111)
1602 (emit-byte segment #b10111101)
1603 (emit-ea segment src (reg-tn-encoding dst)))))
1605 (defun emit-bit-test-and-mumble (segment src index opcode)
1606 (let ((size (operand-size src)))
1607 (when (eq size :byte)
1608 (error "can't scan bytes: ~S" src))
1609 (maybe-emit-operand-size-prefix segment size)
1610 (emit-byte segment #b00001111)
1611 (cond ((integerp index)
1612 (emit-byte segment #b10111010)
1613 (emit-ea segment src opcode)
1614 (emit-byte segment index))
1616 (emit-byte segment (dpb opcode (byte 3 3) #b10000011))
1617 (emit-ea segment src (reg-tn-encoding index))))))
1619 (define-instruction bt (segment src index)
1621 (emit-bit-test-and-mumble segment src index #b100)))
1623 (define-instruction btc (segment src index)
1625 (emit-bit-test-and-mumble segment src index #b111)))
1627 (define-instruction btr (segment src index)
1629 (emit-bit-test-and-mumble segment src index #b110)))
1631 (define-instruction bts (segment src index)
1633 (emit-bit-test-and-mumble segment src index #b101)))
1636 ;;;; control transfer
1638 (define-instruction call (segment where)
1639 (:printer near-jump ((op #b11101000)))
1640 (:printer reg/mem ((op '(#b1111111 #b010)) (width 1)))
1644 (emit-byte segment #b11101000)
1645 (emit-back-patch segment
1647 #'(lambda (segment posn)
1649 (- (label-position where)
1652 (emit-byte segment #b11101000)
1653 (emit-relative-fixup segment where))
1655 (emit-byte segment #b11111111)
1656 (emit-ea segment where #b010)))))
1658 (defun emit-byte-displacement-backpatch (segment target)
1659 (emit-back-patch segment
1661 #'(lambda (segment posn)
1662 (let ((disp (- (label-position target) (1+ posn))))
1663 (assert (<= -128 disp 127))
1664 (emit-byte segment disp)))))
1666 (define-instruction jmp (segment cond &optional where)
1667 ;; conditional jumps
1668 (:printer short-cond-jump ((op #b0111)) '('j cc :tab label))
1669 (:printer near-cond-jump () '('j cc :tab label))
1670 ;; unconditional jumps
1671 (:printer short-jump ((op #b1011)))
1672 (:printer near-jump ((op #b11101001)) )
1673 (:printer reg/mem ((op '(#b1111111 #b100)) (width 1)))
1678 #'(lambda (segment posn delta-if-after)
1679 (let ((disp (- (label-position where posn delta-if-after)
1681 (when (<= -128 disp 127)
1683 (dpb (conditional-opcode cond)
1686 (emit-byte-displacement-backpatch segment where)
1688 #'(lambda (segment posn)
1689 (let ((disp (- (label-position where) (+ posn 6))))
1690 (emit-byte segment #b00001111)
1692 (dpb (conditional-opcode cond)
1695 (emit-dword segment disp)))))
1696 ((label-p (setq where cond))
1699 #'(lambda (segment posn delta-if-after)
1700 (let ((disp (- (label-position where posn delta-if-after)
1702 (when (<= -128 disp 127)
1703 (emit-byte segment #b11101011)
1704 (emit-byte-displacement-backpatch segment where)
1706 #'(lambda (segment posn)
1707 (let ((disp (- (label-position where) (+ posn 5))))
1708 (emit-byte segment #b11101001)
1709 (emit-dword segment disp))
1712 (emit-byte segment #b11101001)
1713 (emit-relative-fixup segment where))
1715 (unless (or (ea-p where) (tn-p where))
1716 (error "don't know what to do with ~A" where))
1717 (emit-byte segment #b11111111)
1718 (emit-ea segment where #b100)))))
1720 (define-instruction jmp-short (segment label)
1722 (emit-byte segment #b11101011)
1723 (emit-byte-displacement-backpatch segment label)))
1725 (define-instruction ret (segment &optional stack-delta)
1726 (:printer byte ((op #b11000011)))
1727 (:printer byte ((op #b11000010) (imm nil :type 'imm-word-16))
1731 (emit-byte segment #b11000010)
1732 (emit-word segment stack-delta))
1734 (emit-byte segment #b11000011)))))
1736 (define-instruction jecxz (segment target)
1737 (:printer short-jump ((op #b0011)))
1739 (emit-byte segment #b11100011)
1740 (emit-byte-displacement-backpatch segment target)))
1742 (define-instruction loop (segment target)
1743 (:printer short-jump ((op #b0010)))
1745 (emit-byte segment #b11100010) ; pfw this was 11100011, or jecxz!!!!
1746 (emit-byte-displacement-backpatch segment target)))
1748 (define-instruction loopz (segment target)
1749 (:printer short-jump ((op #b0001)))
1751 (emit-byte segment #b11100001)
1752 (emit-byte-displacement-backpatch segment target)))
1754 (define-instruction loopnz (segment target)
1755 (:printer short-jump ((op #b0000)))
1757 (emit-byte segment #b11100000)
1758 (emit-byte-displacement-backpatch segment target)))
1760 ;;;; conditional byte set
1762 (define-instruction set (segment dst cond)
1763 (:printer cond-set ())
1765 (emit-byte segment #b00001111)
1766 (emit-byte segment (dpb (conditional-opcode cond) (byte 4 0) #b10010000))
1767 (emit-ea segment dst #b000)))
1771 (define-instruction enter (segment disp &optional (level 0))
1772 (:declare (type (unsigned-byte 16) disp)
1773 (type (unsigned-byte 8) level))
1774 (:printer enter-format ((op #b11001000)))
1776 (emit-byte segment #b11001000)
1777 (emit-word segment disp)
1778 (emit-byte segment level)))
1780 (define-instruction leave (segment)
1781 (:printer byte ((op #b11001001)))
1783 (emit-byte segment #b11001001)))
1785 ;;;; interrupt instructions
1787 (defun snarf-error-junk (sap offset &optional length-only)
1788 (let* ((length (sb!sys:sap-ref-8 sap offset))
1789 (vector (make-array length :element-type '(unsigned-byte 8))))
1790 (declare (type sb!sys:system-area-pointer sap)
1791 (type (unsigned-byte 8) length)
1792 (type (simple-array (unsigned-byte 8) (*)) vector))
1794 (values 0 (1+ length) nil nil))
1796 (sb!kernel:copy-from-system-area sap (* byte-bits (1+ offset))
1799 (* length byte-bits))
1800 (collect ((sc-offsets)
1802 (lengths 1) ; the length byte
1804 (error-number (sb!c::read-var-integer vector index)))
1807 (when (>= index length)
1809 (let ((old-index index))
1810 (sc-offsets (sb!c::read-var-integer vector index))
1811 (lengths (- index old-index))))
1812 (values error-number
1818 (defmacro break-cases (breaknum &body cases)
1819 (let ((bn-temp (gensym)))
1820 (collect ((clauses))
1821 (dolist (case cases)
1822 (clauses `((= ,bn-temp ,(car case)) ,@(cdr case))))
1823 `(let ((,bn-temp ,breaknum))
1824 (cond ,@(clauses))))))
1827 (defun break-control (chunk inst stream dstate)
1828 (declare (ignore inst))
1829 (flet ((nt (x) (if stream (sb!disassem:note x dstate))))
1830 ;; FIXME: Make sure that BYTE-IMM-CODE is defined. The genesis
1831 ;; map has it undefined; and it should be easier to look in the target
1832 ;; Lisp (with (DESCRIBE 'BYTE-IMM-CODE)) than to definitively deduce
1833 ;; from first principles whether it's defined in some way that genesis
1835 (case (byte-imm-code chunk dstate)
1838 (sb!disassem:handle-break-args #'snarf-error-junk stream dstate))
1839 (#.sb!vm:cerror-trap
1841 (sb!disassem:handle-break-args #'snarf-error-junk stream dstate))
1842 (#.sb!vm:breakpoint-trap
1843 (nt "breakpoint trap"))
1844 (#.sb!vm:pending-interrupt-trap
1845 (nt "pending interrupt trap"))
1848 (#.sb!vm:function-end-breakpoint-trap
1849 (nt "function end breakpoint trap")))))
1851 (define-instruction break (segment code)
1852 (:declare (type (unsigned-byte 8) code))
1853 (:printer byte-imm ((op #b11001100)) '(:name :tab code)
1854 :control #'break-control)
1856 (emit-byte segment #b11001100)
1857 (emit-byte segment code)))
1859 (define-instruction int (segment number)
1860 (:declare (type (unsigned-byte 8) number))
1861 (:printer byte-imm ((op #b11001101)))
1865 (emit-byte segment #b11001100))
1867 (emit-byte segment #b11001101)
1868 (emit-byte segment number)))))
1870 (define-instruction into (segment)
1871 (:printer byte ((op #b11001110)))
1873 (emit-byte segment #b11001110)))
1875 (define-instruction bound (segment reg bounds)
1877 (let ((size (matching-operand-size reg bounds)))
1878 (when (eq size :byte)
1879 (error "can't bounds-test bytes: ~S" reg))
1880 (maybe-emit-operand-size-prefix segment size)
1881 (emit-byte segment #b01100010)
1882 (emit-ea segment bounds (reg-tn-encoding reg)))))
1884 (define-instruction iret (segment)
1885 (:printer byte ((op #b11001111)))
1887 (emit-byte segment #b11001111)))
1889 ;;;; processor control
1891 (define-instruction hlt (segment)
1892 (:printer byte ((op #b11110100)))
1894 (emit-byte segment #b11110100)))
1896 (define-instruction nop (segment)
1897 (:printer byte ((op #b10010000)))
1899 (emit-byte segment #b10010000)))
1901 (define-instruction wait (segment)
1902 (:printer byte ((op #b10011011)))
1904 (emit-byte segment #b10011011)))
1906 (define-instruction lock (segment)
1907 (:printer byte ((op #b11110000)))
1909 (emit-byte segment #b11110000)))
1911 ;;;; miscellaneous hackery
1913 (define-instruction byte (segment byte)
1915 (emit-byte segment byte)))
1917 (define-instruction word (segment word)
1919 (emit-word segment word)))
1921 (define-instruction dword (segment dword)
1923 (emit-dword segment dword)))
1925 (defun emit-header-data (segment type)
1926 (emit-back-patch segment
1928 (lambda (segment posn)
1932 (component-header-length))
1936 (define-instruction function-header-word (segment)
1938 (emit-header-data segment function-header-type)))
1940 (define-instruction lra-header-word (segment)
1942 (emit-header-data segment return-pc-header-type)))
1944 ;;;; fp instructions
1946 ;;;; FIXME: This section said "added by jrd", which should end up in CREDITS.
1948 ;;;; Note: We treat the single-precision and double-precision variants
1949 ;;;; as separate instructions.
1951 ;;; Load single to st(0).
1952 (define-instruction fld (segment source)
1953 (:printer floating-point ((op '(#b001 #b000))))
1955 (emit-byte segment #b11011001)
1956 (emit-fp-op segment source #b000)))
1958 ;;; Load double to st(0).
1959 (define-instruction fldd (segment source)
1960 (:printer floating-point ((op '(#b101 #b000))))
1961 (:printer floating-point-fp ((op '(#b001 #b000))))
1963 (if (fp-reg-tn-p source)
1964 (emit-byte segment #b11011001)
1965 (emit-byte segment #b11011101))
1966 (emit-fp-op segment source #b000)))
1968 ;;; Load long to st(0).
1969 (define-instruction fldl (segment source)
1970 (:printer floating-point ((op '(#b011 #b101))))
1972 (emit-byte segment #b11011011)
1973 (emit-fp-op segment source #b101)))
1975 ;;; Store single from st(0).
1976 (define-instruction fst (segment dest)
1977 (:printer floating-point ((op '(#b001 #b010))))
1979 (cond ((fp-reg-tn-p dest)
1980 (emit-byte segment #b11011101)
1981 (emit-fp-op segment dest #b010))
1983 (emit-byte segment #b11011001)
1984 (emit-fp-op segment dest #b010)))))
1986 ;;; Store double from st(0).
1987 (define-instruction fstd (segment dest)
1988 (:printer floating-point ((op '(#b101 #b010))))
1989 (:printer floating-point-fp ((op '(#b101 #b010))))
1991 (cond ((fp-reg-tn-p dest)
1992 (emit-byte segment #b11011101)
1993 (emit-fp-op segment dest #b010))
1995 (emit-byte segment #b11011101)
1996 (emit-fp-op segment dest #b010)))))
1998 ;;; Arithmetic ops are all done with at least one operand at top of
1999 ;;; stack. The other operand is is another register or a 32/64 bit
2002 ;;; dtc: I've tried to follow the Intel ASM386 conventions, but note
2003 ;;; that these conflict with the Gdb conventions for binops. To reduce
2004 ;;; the confusion I've added comments showing the mathamatical
2005 ;;; operation and the two syntaxes. By the ASM386 convention the
2006 ;;; instruction syntax is:
2009 ;;; or Fop Destination, Source
2011 ;;; If only one operand is given then it is the source and the
2012 ;;; destination is ST(0). There are reversed forms of the fsub and
2013 ;;; fdiv instructions inducated by an 'R' suffix.
2015 ;;; The mathematical operation for the non-reverse form is always:
2016 ;;; destination = destination op source
2018 ;;; For the reversed form it is:
2019 ;;; destination = source op destination
2021 ;;; The instructions below only accept one operand at present which is
2022 ;;; usually the source. I've hack in extra instructions to implement
2023 ;;; the fops with a ST(i) destination, these have a -sti suffix and
2024 ;;; the operand is the destination with the source being ST(0).
2027 ;;; st(0) = st(0) + memory or st(i).
2028 (define-instruction fadd (segment source)
2029 (:printer floating-point ((op '(#b000 #b000))))
2031 (emit-byte segment #b11011000)
2032 (emit-fp-op segment source #b000)))
2035 ;;; st(0) = st(0) + memory or st(i).
2036 (define-instruction faddd (segment source)
2037 (:printer floating-point ((op '(#b100 #b000))))
2038 (:printer floating-point-fp ((op '(#b000 #b000))))
2040 (if (fp-reg-tn-p source)
2041 (emit-byte segment #b11011000)
2042 (emit-byte segment #b11011100))
2043 (emit-fp-op segment source #b000)))
2045 ;;; Add double destination st(i):
2046 ;;; st(i) = st(0) + st(i).
2047 (define-instruction fadd-sti (segment destination)
2048 (:printer floating-point-fp ((op '(#b100 #b000))))
2050 (assert (fp-reg-tn-p destination))
2051 (emit-byte segment #b11011100)
2052 (emit-fp-op segment destination #b000)))
2054 (define-instruction faddp-sti (segment destination)
2055 (:printer floating-point-fp ((op '(#b110 #b000))))
2057 (assert (fp-reg-tn-p destination))
2058 (emit-byte segment #b11011110)
2059 (emit-fp-op segment destination #b000)))
2061 ;;; Subtract single:
2062 ;;; st(0) = st(0) - memory or st(i).
2063 (define-instruction fsub (segment source)
2064 (:printer floating-point ((op '(#b000 #b100))))
2066 (emit-byte segment #b11011000)
2067 (emit-fp-op segment source #b100)))
2069 ;;; Subtract single, reverse:
2070 ;;; st(0) = memory or st(i) - st(0).
2071 (define-instruction fsubr (segment source)
2072 (:printer floating-point ((op '(#b000 #b101))))
2074 (emit-byte segment #b11011000)
2075 (emit-fp-op segment source #b101)))
2077 ;;; Subtract double:
2078 ;;; st(0) = st(0) - memory or st(i).
2079 (define-instruction fsubd (segment source)
2080 (:printer floating-point ((op '(#b100 #b100))))
2081 (:printer floating-point-fp ((op '(#b000 #b100))))
2083 (if (fp-reg-tn-p source)
2084 (emit-byte segment #b11011000)
2085 (emit-byte segment #b11011100))
2086 (emit-fp-op segment source #b100)))
2088 ;;; Subtract double, reverse:
2089 ;;; st(0) = memory or st(i) - st(0).
2090 (define-instruction fsubrd (segment source)
2091 (:printer floating-point ((op '(#b100 #b101))))
2092 (:printer floating-point-fp ((op '(#b000 #b101))))
2094 (if (fp-reg-tn-p source)
2095 (emit-byte segment #b11011000)
2096 (emit-byte segment #b11011100))
2097 (emit-fp-op segment source #b101)))
2099 ;;; Subtract double, destination st(i):
2100 ;;; st(i) = st(i) - st(0).
2102 ;;; ASM386 syntax: FSUB ST(i), ST
2103 ;;; Gdb syntax: fsubr %st,%st(i)
2104 (define-instruction fsub-sti (segment destination)
2105 (:printer floating-point-fp ((op '(#b100 #b101))))
2107 (assert (fp-reg-tn-p destination))
2108 (emit-byte segment #b11011100)
2109 (emit-fp-op segment destination #b101)))
2111 (define-instruction fsubp-sti (segment destination)
2112 (:printer floating-point-fp ((op '(#b110 #b101))))
2114 (assert (fp-reg-tn-p destination))
2115 (emit-byte segment #b11011110)
2116 (emit-fp-op segment destination #b101)))
2118 ;;; Subtract double, reverse, destination st(i):
2119 ;;; st(i) = st(0) - st(i).
2121 ;;; ASM386 syntax: FSUBR ST(i), ST
2122 ;;; Gdb syntax: fsub %st,%st(i)
2123 (define-instruction fsubr-sti (segment destination)
2124 (:printer floating-point-fp ((op '(#b100 #b100))))
2126 (assert (fp-reg-tn-p destination))
2127 (emit-byte segment #b11011100)
2128 (emit-fp-op segment destination #b100)))
2130 (define-instruction fsubrp-sti (segment destination)
2131 (:printer floating-point-fp ((op '(#b110 #b100))))
2133 (assert (fp-reg-tn-p destination))
2134 (emit-byte segment #b11011110)
2135 (emit-fp-op segment destination #b100)))
2137 ;;; Multiply single:
2138 ;;; st(0) = st(0) * memory or st(i).
2139 (define-instruction fmul (segment source)
2140 (:printer floating-point ((op '(#b000 #b001))))
2142 (emit-byte segment #b11011000)
2143 (emit-fp-op segment source #b001)))
2145 ;;; Multiply double:
2146 ;;; st(0) = st(0) * memory or st(i).
2147 (define-instruction fmuld (segment source)
2148 (:printer floating-point ((op '(#b100 #b001))))
2149 (:printer floating-point-fp ((op '(#b000 #b001))))
2151 (if (fp-reg-tn-p source)
2152 (emit-byte segment #b11011000)
2153 (emit-byte segment #b11011100))
2154 (emit-fp-op segment source #b001)))
2156 ;;; Multiply double, destination st(i):
2157 ;;; st(i) = st(i) * st(0).
2158 (define-instruction fmul-sti (segment destination)
2159 (:printer floating-point-fp ((op '(#b100 #b001))))
2161 (assert (fp-reg-tn-p destination))
2162 (emit-byte segment #b11011100)
2163 (emit-fp-op segment destination #b001)))
2166 ;;; st(0) = st(0) / memory or st(i).
2167 (define-instruction fdiv (segment source)
2168 (:printer floating-point ((op '(#b000 #b110))))
2170 (emit-byte segment #b11011000)
2171 (emit-fp-op segment source #b110)))
2173 ;;; Divide single, reverse:
2174 ;;; st(0) = memory or st(i) / st(0).
2175 (define-instruction fdivr (segment source)
2176 (:printer floating-point ((op '(#b000 #b111))))
2178 (emit-byte segment #b11011000)
2179 (emit-fp-op segment source #b111)))
2182 ;;; st(0) = st(0) / memory or st(i).
2183 (define-instruction fdivd (segment source)
2184 (:printer floating-point ((op '(#b100 #b110))))
2185 (:printer floating-point-fp ((op '(#b000 #b110))))
2187 (if (fp-reg-tn-p source)
2188 (emit-byte segment #b11011000)
2189 (emit-byte segment #b11011100))
2190 (emit-fp-op segment source #b110)))
2192 ;;; Divide double, reverse:
2193 ;;; st(0) = memory or st(i) / st(0).
2194 (define-instruction fdivrd (segment source)
2195 (:printer floating-point ((op '(#b100 #b111))))
2196 (:printer floating-point-fp ((op '(#b000 #b111))))
2198 (if (fp-reg-tn-p source)
2199 (emit-byte segment #b11011000)
2200 (emit-byte segment #b11011100))
2201 (emit-fp-op segment source #b111)))
2203 ;;; Divide double, destination st(i):
2204 ;;; st(i) = st(i) / st(0).
2206 ;;; ASM386 syntax: FDIV ST(i), ST
2207 ;;; Gdb syntax: fdivr %st,%st(i)
2208 (define-instruction fdiv-sti (segment destination)
2209 (:printer floating-point-fp ((op '(#b100 #b111))))
2211 (assert (fp-reg-tn-p destination))
2212 (emit-byte segment #b11011100)
2213 (emit-fp-op segment destination #b111)))
2215 ;;; Divide double, reverse, destination st(i):
2216 ;;; st(i) = st(0) / st(i).
2218 ;;; ASM386 syntax: FDIVR ST(i), ST
2219 ;;; Gdb syntax: fdiv %st,%st(i)
2220 (define-instruction fdivr-sti (segment destination)
2221 (:printer floating-point-fp ((op '(#b100 #b110))))
2223 (assert (fp-reg-tn-p destination))
2224 (emit-byte segment #b11011100)
2225 (emit-fp-op segment destination #b110)))
2227 ;;; Exchange fr0 with fr(n). (There is no double precision variant.)
2228 (define-instruction fxch (segment source)
2229 (:printer floating-point-fp ((op '(#b001 #b001))))
2231 (unless (and (tn-p source)
2232 (eq (sb-name (sc-sb (tn-sc source))) 'float-registers))
2234 (emit-byte segment #b11011001)
2235 (emit-fp-op segment source #b001)))
2237 ;;; Push 32-bit integer to st0.
2238 (define-instruction fild (segment source)
2239 (:printer floating-point ((op '(#b011 #b000))))
2241 (emit-byte segment #b11011011)
2242 (emit-fp-op segment source #b000)))
2244 ;;; Push 64-bit integer to st0.
2245 (define-instruction fildl (segment source)
2246 (:printer floating-point ((op '(#b111 #b101))))
2248 (emit-byte segment #b11011111)
2249 (emit-fp-op segment source #b101)))
2251 ;;; Store 32-bit integer.
2252 (define-instruction fist (segment dest)
2253 (:printer floating-point ((op '(#b011 #b010))))
2255 (emit-byte segment #b11011011)
2256 (emit-fp-op segment dest #b010)))
2258 ;;; Store and pop 32-bit integer.
2259 (define-instruction fistp (segment dest)
2260 (:printer floating-point ((op '(#b011 #b011))))
2262 (emit-byte segment #b11011011)
2263 (emit-fp-op segment dest #b011)))
2265 ;;; Store and pop 64-bit integer.
2266 (define-instruction fistpl (segment dest)
2267 (:printer floating-point ((op '(#b111 #b111))))
2269 (emit-byte segment #b11011111)
2270 (emit-fp-op segment dest #b111)))
2272 ;;; Store single from st(0) and pop.
2273 (define-instruction fstp (segment dest)
2274 (:printer floating-point ((op '(#b001 #b011))))
2276 (cond ((fp-reg-tn-p dest)
2277 (emit-byte segment #b11011101)
2278 (emit-fp-op segment dest #b011))
2280 (emit-byte segment #b11011001)
2281 (emit-fp-op segment dest #b011)))))
2283 ;;; Store double from st(0) and pop.
2284 (define-instruction fstpd (segment dest)
2285 (:printer floating-point ((op '(#b101 #b011))))
2286 (:printer floating-point-fp ((op '(#b101 #b011))))
2288 (cond ((fp-reg-tn-p dest)
2289 (emit-byte segment #b11011101)
2290 (emit-fp-op segment dest #b011))
2292 (emit-byte segment #b11011101)
2293 (emit-fp-op segment dest #b011)))))
2295 ;;; Store long from st(0) and pop.
2296 (define-instruction fstpl (segment dest)
2297 (:printer floating-point ((op '(#b011 #b111))))
2299 (emit-byte segment #b11011011)
2300 (emit-fp-op segment dest #b111)))
2302 ;;; Decrement stack-top pointer.
2303 (define-instruction fdecstp (segment)
2304 (:printer floating-point-no ((op #b10110)))
2306 (emit-byte segment #b11011001)
2307 (emit-byte segment #b11110110)))
2309 ;;; Increment stack-top pointer.
2310 (define-instruction fincstp (segment)
2311 (:printer floating-point-no ((op #b10111)))
2313 (emit-byte segment #b11011001)
2314 (emit-byte segment #b11110111)))
2316 ;;; Free fp register.
2317 (define-instruction ffree (segment dest)
2318 (:printer floating-point-fp ((op '(#b101 #b000))))
2320 (emit-byte segment #b11011101)
2321 (emit-fp-op segment dest #b000)))
2323 (define-instruction fabs (segment)
2324 (:printer floating-point-no ((op #b00001)))
2326 (emit-byte segment #b11011001)
2327 (emit-byte segment #b11100001)))
2329 (define-instruction fchs (segment)
2330 (:printer floating-point-no ((op #b00000)))
2332 (emit-byte segment #b11011001)
2333 (emit-byte segment #b11100000)))
2335 (define-instruction frndint(segment)
2336 (:printer floating-point-no ((op #b11100)))
2338 (emit-byte segment #b11011001)
2339 (emit-byte segment #b11111100)))
2342 (define-instruction fninit(segment)
2343 (:printer floating-point-5 ((op #b00011)))
2345 (emit-byte segment #b11011011)
2346 (emit-byte segment #b11100011)))
2348 ;;; Store Status Word to AX.
2349 (define-instruction fnstsw(segment)
2350 (:printer floating-point-st ((op #b00000)))
2352 (emit-byte segment #b11011111)
2353 (emit-byte segment #b11100000)))
2355 ;;; Load Control Word.
2357 ;;; src must be a memory location
2358 (define-instruction fldcw(segment src)
2359 (:printer floating-point ((op '(#b001 #b101))))
2361 (emit-byte segment #b11011001)
2362 (emit-fp-op segment src #b101)))
2364 ;;; Store Control Word.
2365 (define-instruction fnstcw(segment dst)
2366 (:printer floating-point ((op '(#b001 #b111))))
2368 (emit-byte segment #b11011001)
2369 (emit-fp-op segment dst #b111)))
2371 ;;; Store FP Environment.
2372 (define-instruction fstenv(segment dst)
2373 (:printer floating-point ((op '(#b001 #b110))))
2375 (emit-byte segment #b11011001)
2376 (emit-fp-op segment dst #b110)))
2378 ;;; Restore FP Environment.
2379 (define-instruction fldenv(segment src)
2380 (:printer floating-point ((op '(#b001 #b100))))
2382 (emit-byte segment #b11011001)
2383 (emit-fp-op segment src #b100)))
2386 (define-instruction fsave(segment dst)
2387 (:printer floating-point ((op '(#b101 #b110))))
2389 (emit-byte segment #b11011101)
2390 (emit-fp-op segment dst #b110)))
2392 ;;; Restore FP State.
2393 (define-instruction frstor(segment src)
2394 (:printer floating-point ((op '(#b101 #b100))))
2396 (emit-byte segment #b11011101)
2397 (emit-fp-op segment src #b100)))
2399 ;;; Clear exceptions.
2400 (define-instruction fnclex(segment)
2401 (:printer floating-point-5 ((op #b00010)))
2403 (emit-byte segment #b11011011)
2404 (emit-byte segment #b11100010)))
2407 (define-instruction fcom (segment src)
2408 (:printer floating-point ((op '(#b000 #b010))))
2410 (emit-byte segment #b11011000)
2411 (emit-fp-op segment src #b010)))
2413 (define-instruction fcomd (segment src)
2414 (:printer floating-point ((op '(#b100 #b010))))
2415 (:printer floating-point-fp ((op '(#b000 #b010))))
2417 (if (fp-reg-tn-p src)
2418 (emit-byte segment #b11011000)
2419 (emit-byte segment #b11011100))
2420 (emit-fp-op segment src #b010)))
2422 ;;; Compare ST1 to ST0, popping the stack twice.
2423 (define-instruction fcompp (segment)
2424 (:printer floating-point-3 ((op '(#b110 #b011001))))
2426 (emit-byte segment #b11011110)
2427 (emit-byte segment #b11011001)))
2429 ;;; unordered comparison
2430 (define-instruction fucom (segment src)
2431 ;; XX Printer conflicts with frstor
2432 ;; (:printer floating-point ((op '(#b101 #b100))))
2434 (assert (fp-reg-tn-p src))
2435 (emit-byte segment #b11011101)
2436 (emit-fp-op segment src #b100)))
2438 (define-instruction ftst (segment)
2439 (:printer floating-point-no ((op #b00100)))
2441 (emit-byte segment #b11011001)
2442 (emit-byte segment #b11100100)))
2446 (define-instruction fsqrt(segment)
2447 (:printer floating-point-no ((op #b11010)))
2449 (emit-byte segment #b11011001)
2450 (emit-byte segment #b11111010)))
2452 (define-instruction fscale(segment)
2453 (:printer floating-point-no ((op #b11101)))
2455 (emit-byte segment #b11011001)
2456 (emit-byte segment #b11111101)))
2458 (define-instruction fxtract(segment)
2459 (:printer floating-point-no ((op #b10100)))
2461 (emit-byte segment #b11011001)
2462 (emit-byte segment #b11110100)))
2464 (define-instruction fsin(segment)
2465 (:printer floating-point-no ((op #b11110)))
2467 (emit-byte segment #b11011001)
2468 (emit-byte segment #b11111110)))
2470 (define-instruction fcos(segment)
2471 (:printer floating-point-no ((op #b11111)))
2473 (emit-byte segment #b11011001)
2474 (emit-byte segment #b11111111)))
2476 (define-instruction fprem1(segment)
2477 (:printer floating-point-no ((op #b10101)))
2479 (emit-byte segment #b11011001)
2480 (emit-byte segment #b11110101)))
2482 (define-instruction fprem(segment)
2483 (:printer floating-point-no ((op #b11000)))
2485 (emit-byte segment #b11011001)
2486 (emit-byte segment #b11111000)))
2488 (define-instruction fxam (segment)
2489 (:printer floating-point-no ((op #b00101)))
2491 (emit-byte segment #b11011001)
2492 (emit-byte segment #b11100101)))
2494 ;;; These do push/pop to stack and need special handling
2495 ;;; in any VOPs that use them. See the book.
2497 ;;; st0 <- st1*log2(st0)
2498 (define-instruction fyl2x(segment) ; pops stack
2499 (:printer floating-point-no ((op #b10001)))
2501 (emit-byte segment #b11011001)
2502 (emit-byte segment #b11110001)))
2504 (define-instruction fyl2xp1(segment)
2505 (:printer floating-point-no ((op #b11001)))
2507 (emit-byte segment #b11011001)
2508 (emit-byte segment #b11111001)))
2510 (define-instruction f2xm1(segment)
2511 (:printer floating-point-no ((op #b10000)))
2513 (emit-byte segment #b11011001)
2514 (emit-byte segment #b11110000)))
2516 (define-instruction fptan(segment) ; st(0) <- 1; st(1) <- tan
2517 (:printer floating-point-no ((op #b10010)))
2519 (emit-byte segment #b11011001)
2520 (emit-byte segment #b11110010)))
2522 (define-instruction fpatan(segment) ; POPS STACK
2523 (:printer floating-point-no ((op #b10011)))
2525 (emit-byte segment #b11011001)
2526 (emit-byte segment #b11110011)))
2528 ;;;; loading constants
2530 (define-instruction fldz(segment)
2531 (:printer floating-point-no ((op #b01110)))
2533 (emit-byte segment #b11011001)
2534 (emit-byte segment #b11101110)))
2536 (define-instruction fld1(segment)
2537 (:printer floating-point-no ((op #b01000)))
2539 (emit-byte segment #b11011001)
2540 (emit-byte segment #b11101000)))
2542 (define-instruction fldpi(segment)
2543 (:printer floating-point-no ((op #b01011)))
2545 (emit-byte segment #b11011001)
2546 (emit-byte segment #b11101011)))
2548 (define-instruction fldl2t(segment)
2549 (:printer floating-point-no ((op #b01001)))
2551 (emit-byte segment #b11011001)
2552 (emit-byte segment #b11101001)))
2554 (define-instruction fldl2e(segment)
2555 (:printer floating-point-no ((op #b01010)))
2557 (emit-byte segment #b11011001)
2558 (emit-byte segment #b11101010)))
2560 (define-instruction fldlg2(segment)
2561 (:printer floating-point-no ((op #b01100)))
2563 (emit-byte segment #b11011001)
2564 (emit-byte segment #b11101100)))
2566 (define-instruction fldln2(segment)
2567 (:printer floating-point-no ((op #b01101)))
2569 (emit-byte segment #b11011001)
2570 (emit-byte segment #b11101101)))