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.
18 ;;; Note: In CMU CL, this used to be a call to SET-DISASSEM-PARAMS.
19 (setf sb!disassem:*disassem-inst-alignment-bytes* 1)
21 (deftype reg () '(unsigned-byte 3))
23 (def!constant +default-operand-size+ :dword)
25 (eval-when (#-sb-xc :compile-toplevel :load-toplevel :execute)
27 (defun offset-next (value dstate)
28 (declare (type integer value)
29 (type sb!disassem:disassem-state dstate))
30 (+ (sb!disassem:dstate-next-addr dstate) value))
32 (defparameter *default-address-size*
33 ;; Actually, :DWORD is the only one really supported.
36 (defparameter *byte-reg-names*
37 #(al cl dl bl ah ch dh bh))
38 (defparameter *word-reg-names*
39 #(ax cx dx bx sp bp si di))
40 (defparameter *dword-reg-names*
41 #(eax ecx edx ebx esp ebp esi edi))
43 (defun print-reg-with-width (value width stream dstate)
44 (declare (ignore dstate))
45 (princ (aref (ecase width
46 (:byte *byte-reg-names*)
47 (:word *word-reg-names*)
48 (:dword *dword-reg-names*))
51 ;; XXX plus should do some source-var notes
54 (defun print-reg (value stream dstate)
55 (declare (type reg value)
57 (type sb!disassem:disassem-state dstate))
58 (print-reg-with-width value
59 (sb!disassem:dstate-get-prop dstate 'width)
63 (defun print-word-reg (value stream dstate)
64 (declare (type reg value)
66 (type sb!disassem:disassem-state dstate))
67 (print-reg-with-width value
68 (or (sb!disassem:dstate-get-prop dstate 'word-width)
69 +default-operand-size+)
73 (defun print-byte-reg (value stream dstate)
74 (declare (type reg value)
76 (type sb!disassem:disassem-state dstate))
77 (print-reg-with-width value :byte stream dstate))
79 (defun print-addr-reg (value stream dstate)
80 (declare (type reg value)
82 (type sb!disassem:disassem-state dstate))
83 (print-reg-with-width value *default-address-size* stream dstate))
85 (defun print-reg/mem (value stream dstate)
86 (declare (type (or list reg) value)
88 (type sb!disassem:disassem-state dstate))
89 (if (typep value 'reg)
90 (print-reg value stream dstate)
91 (print-mem-access value stream nil dstate)))
93 ;; Same as print-reg/mem, but prints an explicit size indicator for
95 (defun print-sized-reg/mem (value stream dstate)
96 (declare (type (or list reg) value)
98 (type sb!disassem:disassem-state dstate))
99 (if (typep value 'reg)
100 (print-reg value stream dstate)
101 (print-mem-access value stream t dstate)))
103 (defun print-byte-reg/mem (value stream dstate)
104 (declare (type (or list reg) value)
106 (type sb!disassem:disassem-state dstate))
107 (if (typep value 'reg)
108 (print-byte-reg value stream dstate)
109 (print-mem-access value stream t dstate)))
111 (defun print-word-reg/mem (value stream dstate)
112 (declare (type (or list reg) value)
114 (type sb!disassem:disassem-state dstate))
115 (if (typep value 'reg)
116 (print-word-reg value stream dstate)
117 (print-mem-access value stream nil dstate)))
119 (defun print-label (value stream dstate)
120 (declare (ignore dstate))
121 (sb!disassem:princ16 value stream))
123 ;;; Returns either an integer, meaning a register, or a list of
124 ;;; (BASE-REG OFFSET INDEX-REG INDEX-SCALE), where any component
125 ;;; may be missing or nil to indicate that it's not used or has the
126 ;;; obvious default value (e.g., 1 for the index-scale).
127 (defun prefilter-reg/mem (value dstate)
128 (declare (type list value)
129 (type sb!disassem:disassem-state dstate))
130 (let ((mod (car value))
132 (declare (type (unsigned-byte 2) mod)
133 (type (unsigned-byte 3) r/m))
139 (let ((sib (sb!disassem:read-suffix 8 dstate)))
140 (declare (type (unsigned-byte 8) sib))
141 (let ((base-reg (ldb (byte 3 0) sib))
142 (index-reg (ldb (byte 3 3) sib))
143 (index-scale (ldb (byte 2 6) sib)))
144 (declare (type (unsigned-byte 3) base-reg index-reg)
145 (type (unsigned-byte 2) index-scale))
149 (if (= base-reg #b101)
150 (sb!disassem:read-signed-suffix 32 dstate)
153 (sb!disassem:read-signed-suffix 8 dstate))
155 (sb!disassem:read-signed-suffix 32 dstate)))))
156 (list (if (and (= mod #b00) (= base-reg #b101)) nil base-reg)
158 (if (= index-reg #b100) nil index-reg)
159 (ash 1 index-scale))))))
160 ((and (= mod #b00) (= r/m #b101))
161 (list nil (sb!disassem:read-signed-suffix 32 dstate)) )
165 (list r/m (sb!disassem:read-signed-suffix 8 dstate)))
167 (list r/m (sb!disassem:read-signed-suffix 32 dstate))))))
170 ;;; This is a sort of bogus prefilter that just stores the info globally for
171 ;;; other people to use; it probably never gets printed.
172 (defun prefilter-width (value dstate)
173 (setf (sb!disassem:dstate-get-prop dstate 'width)
177 ;; set by a prefix instruction
178 (or (sb!disassem:dstate-get-prop dstate 'word-width)
179 +default-operand-size+)))
180 (when (not (eql word-width +default-operand-size+))
182 (setf (sb!disassem:dstate-get-prop dstate 'word-width)
183 +default-operand-size+))
186 (defun read-address (value dstate)
187 (declare (ignore value)) ; always nil anyway
188 (sb!disassem:read-suffix (width-bits *default-address-size*) dstate))
190 (defun width-bits (width)
200 ;;;; disassembler argument types
202 (sb!disassem:define-arg-type displacement
204 :use-label #'offset-next
205 :printer (lambda (value stream dstate)
206 (sb!disassem:maybe-note-assembler-routine value nil dstate)
207 (print-label value stream dstate)))
209 (sb!disassem:define-arg-type accum
210 :printer (lambda (value stream dstate)
211 (declare (ignore value)
213 (type sb!disassem:disassem-state dstate))
214 (print-reg 0 stream dstate)))
216 (sb!disassem:define-arg-type word-accum
217 :printer (lambda (value stream dstate)
218 (declare (ignore value)
220 (type sb!disassem:disassem-state dstate))
221 (print-word-reg 0 stream dstate)))
223 (sb!disassem:define-arg-type reg
224 :printer #'print-reg)
226 (sb!disassem:define-arg-type addr-reg
227 :printer #'print-addr-reg)
229 (sb!disassem:define-arg-type word-reg
230 :printer #'print-word-reg)
232 (sb!disassem:define-arg-type imm-addr
233 :prefilter #'read-address
234 :printer #'print-label)
236 (sb!disassem:define-arg-type imm-data
237 :prefilter (lambda (value dstate)
238 (declare (ignore value)) ; always nil anyway
239 (sb!disassem:read-suffix
240 (width-bits (sb!disassem:dstate-get-prop dstate 'width))
243 (sb!disassem:define-arg-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))))
249 (sb!disassem:define-arg-type signed-imm-byte
250 :prefilter (lambda (value dstate)
251 (declare (ignore value)) ; always nil anyway
252 (sb!disassem:read-signed-suffix 8 dstate)))
254 (sb!disassem:define-arg-type signed-imm-dword
255 :prefilter (lambda (value dstate)
256 (declare (ignore value)) ; always nil anyway
257 (sb!disassem:read-signed-suffix 32 dstate)))
259 (sb!disassem:define-arg-type imm-word
260 :prefilter (lambda (value dstate)
261 (declare (ignore value)) ; always nil anyway
263 (or (sb!disassem:dstate-get-prop dstate 'word-width)
264 +default-operand-size+)))
265 (sb!disassem:read-suffix (width-bits width) dstate))))
267 ;;; needed for the ret imm16 instruction
268 (sb!disassem:define-arg-type imm-word-16
269 :prefilter (lambda (value dstate)
270 (declare (ignore value)) ; always nil anyway
271 (sb!disassem:read-suffix 16 dstate)))
273 (sb!disassem:define-arg-type reg/mem
274 :prefilter #'prefilter-reg/mem
275 :printer #'print-reg/mem)
276 (sb!disassem:define-arg-type sized-reg/mem
277 ;; Same as reg/mem, but prints an explicit size indicator for
278 ;; memory references.
279 :prefilter #'prefilter-reg/mem
280 :printer #'print-sized-reg/mem)
281 (sb!disassem:define-arg-type byte-reg/mem
282 :prefilter #'prefilter-reg/mem
283 :printer #'print-byte-reg/mem)
284 (sb!disassem:define-arg-type word-reg/mem
285 :prefilter #'prefilter-reg/mem
286 :printer #'print-word-reg/mem)
289 (eval-when (#-sb-xc :compile-toplevel :load-toplevel :execute)
290 (defun print-fp-reg (value stream dstate)
291 (declare (ignore dstate))
292 (format stream "FR~D" value))
293 (defun prefilter-fp-reg (value dstate)
295 (declare (ignore dstate))
298 (sb!disassem:define-arg-type fp-reg
299 :prefilter #'prefilter-fp-reg
300 :printer #'print-fp-reg)
302 (sb!disassem:define-arg-type width
303 :prefilter #'prefilter-width
304 :printer (lambda (value stream dstate)
307 (and (numberp value) (zerop value))) ; zzz jrd
310 ;; set by a prefix instruction
311 (or (sb!disassem:dstate-get-prop dstate 'word-width)
312 +default-operand-size+)))
313 (princ (schar (symbol-name word-width) 0) stream)))))
315 (eval-when (:compile-toplevel :load-toplevel :execute)
316 (defparameter *conditions*
319 (:b . 2) (:nae . 2) (:c . 2)
320 (:nb . 3) (:ae . 3) (:nc . 3)
321 (:eq . 4) (:e . 4) (:z . 4)
328 (:np . 11) (:po . 11)
329 (:l . 12) (:nge . 12)
330 (:nl . 13) (:ge . 13)
331 (:le . 14) (:ng . 14)
332 (: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-arg-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 (sb!disassem:define-instruction-format (ext-reg/mem-imm 24
486 :include 'ext-reg/mem
488 '(:name :tab reg/mem ", " imm))
489 (imm :type 'imm-data))
491 ;;;; This section was added by jrd, for fp instructions.
493 ;;; regular fp inst to/from registers/memory
494 (sb!disassem:define-instruction-format (floating-point 16
496 `(:name :tab reg/mem))
497 (prefix :field (byte 5 3) :value #b11011)
498 (op :fields (list (byte 3 0) (byte 3 11)))
499 (reg/mem :fields (list (byte 2 14) (byte 3 8)) :type 'reg/mem))
501 ;;; fp insn to/from fp reg
502 (sb!disassem:define-instruction-format (floating-point-fp 16
503 :default-printer `(:name :tab fp-reg))
504 (prefix :field (byte 5 3) :value #b11011)
505 (suffix :field (byte 2 14) :value #b11)
506 (op :fields (list (byte 3 0) (byte 3 11)))
507 (fp-reg :field (byte 3 8) :type 'fp-reg))
509 ;;; fp insn to/from fp reg, with the reversed source/destination flag.
510 (sb!disassem:define-instruction-format
511 (floating-point-fp-d 16
512 :default-printer `(:name :tab ,(swap-if 'd "ST0" ", " 'fp-reg)))
513 (prefix :field (byte 5 3) :value #b11011)
514 (suffix :field (byte 2 14) :value #b11)
515 (op :fields (list (byte 2 0) (byte 3 11)))
516 (d :field (byte 1 2))
517 (fp-reg :field (byte 3 8) :type 'fp-reg))
520 ;;; (added by (?) pfw)
521 ;;; fp no operand isns
522 (sb!disassem:define-instruction-format (floating-point-no 16
523 :default-printer '(:name))
524 (prefix :field (byte 8 0) :value #b11011001)
525 (suffix :field (byte 3 13) :value #b111)
526 (op :field (byte 5 8)))
528 (sb!disassem:define-instruction-format (floating-point-3 16
529 :default-printer '(:name))
530 (prefix :field (byte 5 3) :value #b11011)
531 (suffix :field (byte 2 14) :value #b11)
532 (op :fields (list (byte 3 0) (byte 6 8))))
534 (sb!disassem:define-instruction-format (floating-point-5 16
535 :default-printer '(:name))
536 (prefix :field (byte 8 0) :value #b11011011)
537 (suffix :field (byte 3 13) :value #b111)
538 (op :field (byte 5 8)))
540 (sb!disassem:define-instruction-format (floating-point-st 16
541 :default-printer '(:name))
542 (prefix :field (byte 8 0) :value #b11011111)
543 (suffix :field (byte 3 13) :value #b111)
544 (op :field (byte 5 8)))
546 (sb!disassem:define-instruction-format (string-op 8
548 :default-printer '(:name width)))
550 (sb!disassem:define-instruction-format (short-cond-jump 16)
551 (op :field (byte 4 4))
552 (cc :field (byte 4 0) :type 'condition-code)
553 (label :field (byte 8 8) :type 'displacement))
555 (sb!disassem:define-instruction-format (short-jump 16
556 :default-printer '(:name :tab label))
557 (const :field (byte 4 4) :value #b1110)
558 (op :field (byte 4 0))
559 (label :field (byte 8 8) :type 'displacement))
561 (sb!disassem:define-instruction-format (near-cond-jump 16)
562 (op :fields (list (byte 8 0) (byte 4 12)) :value '(#b00001111 #b1000))
563 (cc :field (byte 4 8) :type 'condition-code)
564 ;; The disassembler currently doesn't let you have an instruction > 32 bits
565 ;; long, so we fake it by using a prefilter to read the offset.
566 (label :type 'displacement
567 :prefilter (lambda (value dstate)
568 (declare (ignore value)) ; always nil anyway
569 (sb!disassem:read-signed-suffix 32 dstate))))
571 (sb!disassem:define-instruction-format (near-jump 8
572 :default-printer '(:name :tab label))
573 (op :field (byte 8 0))
574 ;; The disassembler currently doesn't let you have an instruction > 32 bits
575 ;; long, so we fake it by using a prefilter to read the address.
576 (label :type 'displacement
577 :prefilter (lambda (value dstate)
578 (declare (ignore value)) ; always nil anyway
579 (sb!disassem:read-signed-suffix 32 dstate))))
582 (sb!disassem:define-instruction-format (cond-set 24
583 :default-printer '('set cc :tab reg/mem))
584 (prefix :field (byte 8 0) :value #b00001111)
585 (op :field (byte 4 12) :value #b1001)
586 (cc :field (byte 4 8) :type 'condition-code)
587 (reg/mem :fields (list (byte 2 22) (byte 3 16))
589 (reg :field (byte 3 19) :value #b000))
591 (sb!disassem:define-instruction-format (cond-move 24
593 '('cmov cc :tab reg ", " reg/mem))
594 (prefix :field (byte 8 0) :value #b00001111)
595 (op :field (byte 4 12) :value #b0100)
596 (cc :field (byte 4 8) :type 'condition-code)
597 (reg/mem :fields (list (byte 2 22) (byte 3 16))
599 (reg :field (byte 3 19) :type 'reg))
601 (sb!disassem:define-instruction-format (enter-format 32
602 :default-printer '(:name
604 (:unless (:constant 0)
606 (op :field (byte 8 0))
607 (disp :field (byte 16 8))
608 (level :field (byte 8 24)))
610 ;;; Single byte instruction with an immediate byte argument.
611 (sb!disassem:define-instruction-format (byte-imm 16
612 :default-printer '(:name :tab code))
613 (op :field (byte 8 0))
614 (code :field (byte 8 8)))
616 ;;;; primitive emitters
618 (define-bitfield-emitter emit-word 16
621 (define-bitfield-emitter emit-dword 32
624 (define-bitfield-emitter emit-byte-with-reg 8
625 (byte 5 3) (byte 3 0))
627 (define-bitfield-emitter emit-mod-reg-r/m-byte 8
628 (byte 2 6) (byte 3 3) (byte 3 0))
630 (define-bitfield-emitter emit-sib-byte 8
631 (byte 2 6) (byte 3 3) (byte 3 0))
635 (defun emit-absolute-fixup (segment fixup)
636 (note-fixup segment :absolute fixup)
637 (let ((offset (fixup-offset fixup)))
639 (emit-back-patch segment
640 4 ; FIXME: n-word-bytes
641 (lambda (segment posn)
642 (declare (ignore posn))
644 (- (+ (component-header-length)
645 (or (label-position offset)
647 other-pointer-lowtag))))
648 (emit-dword segment (or offset 0)))))
650 (defun emit-relative-fixup (segment fixup)
651 (note-fixup segment :relative fixup)
652 (emit-dword segment (or (fixup-offset fixup) 0)))
654 ;;;; the effective-address (ea) structure
656 (defun reg-tn-encoding (tn)
657 (declare (type tn tn))
658 (aver (eq (sb-name (sc-sb (tn-sc tn))) 'registers))
659 (let ((offset (tn-offset tn)))
660 (logior (ash (logand offset 1) 2)
663 (defstruct (ea (:constructor make-ea (size &key base index scale disp))
665 (size nil :type (member :byte :word :dword))
666 (base nil :type (or tn null))
667 (index nil :type (or tn null))
668 (scale 1 :type (member 1 2 4 8))
669 (disp 0 :type (or (unsigned-byte 32) (signed-byte 32) fixup)))
670 (def!method print-object ((ea ea) stream)
671 (cond ((or *print-escape* *print-readably*)
672 (print-unreadable-object (ea stream :type t)
674 "~S~@[ base=~S~]~@[ index=~S~]~@[ scale=~S~]~@[ disp=~S~]"
678 (let ((scale (ea-scale ea)))
679 (if (= scale 1) nil scale))
682 (format stream "~A PTR [" (symbol-name (ea-size ea)))
684 (write-string (sb!c::location-print-name (ea-base ea)) stream)
686 (write-string "+" stream)))
688 (write-string (sb!c::location-print-name (ea-index ea)) stream))
689 (unless (= (ea-scale ea) 1)
690 (format stream "*~A" (ea-scale ea)))
691 (typecase (ea-disp ea)
694 (format stream "~@D" (ea-disp ea)))
696 (format stream "+~A" (ea-disp ea))))
697 (write-char #\] stream))))
699 (defun emit-ea (segment thing reg &optional allow-constants)
702 (ecase (sb-name (sc-sb (tn-sc thing)))
704 (emit-mod-reg-r/m-byte segment #b11 reg (reg-tn-encoding thing)))
706 ;; Convert stack tns into an index off of EBP.
707 (let ((disp (- (* (1+ (tn-offset thing)) n-word-bytes))))
708 (cond ((< -128 disp 127)
709 (emit-mod-reg-r/m-byte segment #b01 reg #b101)
710 (emit-byte segment disp))
712 (emit-mod-reg-r/m-byte segment #b10 reg #b101)
713 (emit-dword segment disp)))))
715 (unless allow-constants
717 "Constant TNs can only be directly used in MOV, PUSH, and CMP."))
718 (emit-mod-reg-r/m-byte segment #b00 reg #b101)
719 (emit-absolute-fixup segment
722 (- (* (tn-offset thing) n-word-bytes)
723 other-pointer-lowtag))))))
725 (let* ((base (ea-base thing))
726 (index (ea-index thing))
727 (scale (ea-scale thing))
728 (disp (ea-disp thing))
729 (mod (cond ((or (null base)
731 (not (= (reg-tn-encoding base) #b101))))
733 ((and (fixnump disp) (<= -128 disp 127))
737 (r/m (cond (index #b100)
739 (t (reg-tn-encoding base)))))
740 (emit-mod-reg-r/m-byte segment mod reg r/m)
742 (let ((ss (1- (integer-length scale)))
743 (index (if (null index)
745 (let ((index (reg-tn-encoding index)))
747 (error "can't index off of ESP")
749 (base (if (null base)
751 (reg-tn-encoding base))))
752 (emit-sib-byte segment ss index base)))
754 (emit-byte segment disp))
755 ((or (= mod #b10) (null base))
757 (emit-absolute-fixup segment disp)
758 (emit-dword segment disp))))))
760 (emit-mod-reg-r/m-byte segment #b00 reg #b101)
761 (emit-absolute-fixup segment thing))))
763 (defun fp-reg-tn-p (thing)
765 (eq (sb-name (sc-sb (tn-sc thing))) 'float-registers)))
767 ;;; like the above, but for fp-instructions--jrd
768 (defun emit-fp-op (segment thing op)
769 (if (fp-reg-tn-p thing)
770 (emit-byte segment (dpb op (byte 3 3) (dpb (tn-offset thing)
773 (emit-ea segment thing op)))
775 (defun byte-reg-p (thing)
777 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)
778 (member (sc-name (tn-sc thing)) *byte-sc-names*)
781 (defun byte-ea-p (thing)
783 (ea (eq (ea-size thing) :byte))
785 (and (member (sc-name (tn-sc thing)) *byte-sc-names*) t))
788 (defun word-reg-p (thing)
790 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)
791 (member (sc-name (tn-sc thing)) *word-sc-names*)
794 (defun word-ea-p (thing)
796 (ea (eq (ea-size thing) :word))
797 (tn (and (member (sc-name (tn-sc thing)) *word-sc-names*) t))
800 (defun dword-reg-p (thing)
802 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)
803 (member (sc-name (tn-sc thing)) *dword-sc-names*)
806 (defun dword-ea-p (thing)
808 (ea (eq (ea-size thing) :dword))
810 (and (member (sc-name (tn-sc thing)) *dword-sc-names*) t))
813 (defun register-p (thing)
815 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)))
817 (defun accumulator-p (thing)
818 (and (register-p thing)
819 (= (tn-offset thing) 0)))
823 (def!constant +operand-size-prefix-byte+ #b01100110)
825 (defun maybe-emit-operand-size-prefix (segment size)
826 (unless (or (eq size :byte) (eq size +default-operand-size+))
827 (emit-byte segment +operand-size-prefix-byte+)))
829 (defun operand-size (thing)
832 ;; FIXME: might as well be COND instead of having to use #. readmacro
833 ;; to hack up the code
834 (case (sc-name (tn-sc thing))
841 ;; added by jrd: float-registers is a separate size (?)
847 (error "can't tell the size of ~S ~S" thing (sc-name (tn-sc thing))))))
853 (defun matching-operand-size (dst src)
854 (let ((dst-size (operand-size dst))
855 (src-size (operand-size src)))
858 (if (eq dst-size src-size)
860 (error "size mismatch: ~S is a ~S and ~S is a ~S."
861 dst dst-size src src-size))
865 (error "can't tell the size of either ~S or ~S" dst src)))))
867 (defun emit-sized-immediate (segment size value)
870 (emit-byte segment value))
872 (emit-word segment value))
874 (emit-dword segment value))))
876 ;;;; general data transfer
878 (define-instruction mov (segment dst src)
879 ;; immediate to register
880 (:printer reg ((op #b1011) (imm nil :type 'imm-data))
881 '(:name :tab reg ", " imm))
882 ;; absolute mem to/from accumulator
883 (:printer simple-dir ((op #b101000) (imm nil :type 'imm-addr))
884 `(:name :tab ,(swap-if 'dir 'accum ", " '("[" imm "]"))))
885 ;; register to/from register/memory
886 (:printer reg-reg/mem-dir ((op #b100010)))
887 ;; immediate to register/memory
888 (:printer reg/mem-imm ((op '(#b1100011 #b000))))
891 (let ((size (matching-operand-size dst src)))
892 (maybe-emit-operand-size-prefix segment size)
893 (cond ((register-p dst)
894 (cond ((integerp src)
895 (emit-byte-with-reg segment
899 (reg-tn-encoding dst))
900 (emit-sized-immediate segment size src))
901 ((and (fixup-p src) (accumulator-p dst))
906 (emit-absolute-fixup segment src))
912 (emit-ea segment src (reg-tn-encoding dst) t))))
913 ((and (fixup-p dst) (accumulator-p src))
914 (emit-byte segment (if (eq size :byte) #b10100010 #b10100011))
915 (emit-absolute-fixup segment dst))
917 (emit-byte segment (if (eq size :byte) #b11000110 #b11000111))
918 (emit-ea segment dst #b000)
919 (emit-sized-immediate segment size src))
921 (emit-byte segment (if (eq size :byte) #b10001000 #b10001001))
922 (emit-ea segment dst (reg-tn-encoding src)))
924 (aver (eq size :dword))
925 (emit-byte segment #b11000111)
926 (emit-ea segment dst #b000)
927 (emit-absolute-fixup segment src))
929 (error "bogus arguments to MOV: ~S ~S" dst src))))))
931 (defun emit-move-with-extension (segment dst src opcode)
932 (aver (register-p dst))
933 (let ((dst-size (operand-size dst))
934 (src-size (operand-size src)))
937 (aver (eq src-size :byte))
938 (maybe-emit-operand-size-prefix segment :word)
939 (emit-byte segment #b00001111)
940 (emit-byte segment opcode)
941 (emit-ea segment src (reg-tn-encoding dst)))
945 (maybe-emit-operand-size-prefix segment :dword)
946 (emit-byte segment #b00001111)
947 (emit-byte segment opcode)
948 (emit-ea segment src (reg-tn-encoding dst)))
950 (emit-byte segment #b00001111)
951 (emit-byte segment (logior opcode 1))
952 (emit-ea segment src (reg-tn-encoding dst))))))))
954 (define-instruction movsx (segment dst src)
955 (:printer ext-reg-reg/mem ((op #b1011111) (reg nil :type 'word-reg)))
956 (:emitter (emit-move-with-extension segment dst src #b10111110)))
958 (define-instruction movzx (segment dst src)
959 (:printer ext-reg-reg/mem ((op #b1011011) (reg nil :type 'word-reg)))
960 (:emitter (emit-move-with-extension segment dst src #b10110110)))
962 (define-instruction push (segment src)
964 (:printer reg-no-width ((op #b01010)))
966 (:printer reg/mem ((op '(#b1111111 #b110)) (width 1)))
968 (:printer byte ((op #b01101010) (imm nil :type 'signed-imm-byte))
970 (:printer byte ((op #b01101000) (imm nil :type 'imm-word))
972 ;; ### segment registers?
975 (cond ((integerp src)
976 (cond ((<= -128 src 127)
977 (emit-byte segment #b01101010)
978 (emit-byte segment src))
980 (emit-byte segment #b01101000)
981 (emit-dword segment src))))
983 ;; Interpret the fixup as an immediate dword to push.
984 (emit-byte segment #b01101000)
985 (emit-absolute-fixup segment src))
987 (let ((size (operand-size src)))
988 (aver (not (eq size :byte)))
989 (maybe-emit-operand-size-prefix segment size)
990 (cond ((register-p src)
991 (emit-byte-with-reg segment #b01010 (reg-tn-encoding src)))
993 (emit-byte segment #b11111111)
994 (emit-ea segment src #b110 t))))))))
996 (define-instruction pusha (segment)
997 (:printer byte ((op #b01100000)))
999 (emit-byte segment #b01100000)))
1001 (define-instruction pop (segment dst)
1002 (:printer reg-no-width ((op #b01011)))
1003 (:printer reg/mem ((op '(#b1000111 #b000)) (width 1)))
1005 (let ((size (operand-size dst)))
1006 (aver (not (eq size :byte)))
1007 (maybe-emit-operand-size-prefix segment size)
1008 (cond ((register-p dst)
1009 (emit-byte-with-reg segment #b01011 (reg-tn-encoding dst)))
1011 (emit-byte segment #b10001111)
1012 (emit-ea segment dst #b000))))))
1014 (define-instruction popa (segment)
1015 (:printer byte ((op #b01100001)))
1017 (emit-byte segment #b01100001)))
1019 (define-instruction xchg (segment operand1 operand2)
1020 ;; Register with accumulator.
1021 (:printer reg-no-width ((op #b10010)) '(:name :tab accum ", " reg))
1022 ;; Register/Memory with Register.
1023 (:printer reg-reg/mem ((op #b1000011)))
1025 (let ((size (matching-operand-size operand1 operand2)))
1026 (maybe-emit-operand-size-prefix segment size)
1027 (labels ((xchg-acc-with-something (acc something)
1028 (if (and (not (eq size :byte)) (register-p something))
1029 (emit-byte-with-reg segment
1031 (reg-tn-encoding something))
1032 (xchg-reg-with-something acc something)))
1033 (xchg-reg-with-something (reg something)
1034 (emit-byte segment (if (eq size :byte) #b10000110 #b10000111))
1035 (emit-ea segment something (reg-tn-encoding reg))))
1036 (cond ((accumulator-p operand1)
1037 (xchg-acc-with-something operand1 operand2))
1038 ((accumulator-p operand2)
1039 (xchg-acc-with-something operand2 operand1))
1040 ((register-p operand1)
1041 (xchg-reg-with-something operand1 operand2))
1042 ((register-p operand2)
1043 (xchg-reg-with-something operand2 operand1))
1045 (error "bogus args to XCHG: ~S ~S" operand1 operand2)))))))
1047 (define-instruction lea (segment dst src)
1048 (:printer reg-reg/mem ((op #b1000110) (width 1)))
1050 (aver (dword-reg-p dst))
1051 (emit-byte segment #b10001101)
1052 (emit-ea segment src (reg-tn-encoding dst))))
1054 (define-instruction cmpxchg (segment dst src)
1055 ;; Register/Memory with Register.
1056 (:printer ext-reg-reg/mem ((op #b1011000)) '(:name :tab reg/mem ", " reg))
1058 (aver (register-p src))
1059 (let ((size (matching-operand-size src dst)))
1060 (maybe-emit-operand-size-prefix segment size)
1061 (emit-byte segment #b00001111)
1062 (emit-byte segment (if (eq size :byte) #b10110000 #b10110001))
1063 (emit-ea segment dst (reg-tn-encoding src)))))
1067 (define-instruction fs-segment-prefix (segment)
1069 (emit-byte segment #x64)))
1071 ;;;; flag control instructions
1073 ;;; CLC -- Clear Carry Flag.
1074 (define-instruction clc (segment)
1075 (:printer byte ((op #b11111000)))
1077 (emit-byte segment #b11111000)))
1079 ;;; CLD -- Clear Direction Flag.
1080 (define-instruction cld (segment)
1081 (:printer byte ((op #b11111100)))
1083 (emit-byte segment #b11111100)))
1085 ;;; CLI -- Clear Iterrupt Enable Flag.
1086 (define-instruction cli (segment)
1087 (:printer byte ((op #b11111010)))
1089 (emit-byte segment #b11111010)))
1091 ;;; CMC -- Complement Carry Flag.
1092 (define-instruction cmc (segment)
1093 (:printer byte ((op #b11110101)))
1095 (emit-byte segment #b11110101)))
1097 ;;; LAHF -- Load AH into flags.
1098 (define-instruction lahf (segment)
1099 (:printer byte ((op #b10011111)))
1101 (emit-byte segment #b10011111)))
1103 ;;; POPF -- Pop flags.
1104 (define-instruction popf (segment)
1105 (:printer byte ((op #b10011101)))
1107 (emit-byte segment #b10011101)))
1109 ;;; PUSHF -- push flags.
1110 (define-instruction pushf (segment)
1111 (:printer byte ((op #b10011100)))
1113 (emit-byte segment #b10011100)))
1115 ;;; SAHF -- Store AH into flags.
1116 (define-instruction sahf (segment)
1117 (:printer byte ((op #b10011110)))
1119 (emit-byte segment #b10011110)))
1121 ;;; STC -- Set Carry Flag.
1122 (define-instruction stc (segment)
1123 (:printer byte ((op #b11111001)))
1125 (emit-byte segment #b11111001)))
1127 ;;; STD -- Set Direction Flag.
1128 (define-instruction std (segment)
1129 (:printer byte ((op #b11111101)))
1131 (emit-byte segment #b11111101)))
1133 ;;; STI -- Set Interrupt Enable Flag.
1134 (define-instruction sti (segment)
1135 (:printer byte ((op #b11111011)))
1137 (emit-byte segment #b11111011)))
1141 (defun emit-random-arith-inst (name segment dst src opcode
1142 &optional allow-constants)
1143 (let ((size (matching-operand-size dst src)))
1144 (maybe-emit-operand-size-prefix segment size)
1147 (cond ((and (not (eq size :byte)) (<= -128 src 127))
1148 (emit-byte segment #b10000011)
1149 (emit-ea segment dst opcode allow-constants)
1150 (emit-byte segment src))
1151 ((accumulator-p dst)
1158 (emit-sized-immediate segment size src))
1160 (emit-byte segment (if (eq size :byte) #b10000000 #b10000001))
1161 (emit-ea segment dst opcode allow-constants)
1162 (emit-sized-immediate segment size src))))
1167 (if (eq size :byte) #b00000000 #b00000001)))
1168 (emit-ea segment dst (reg-tn-encoding src) allow-constants))
1173 (if (eq size :byte) #b00000010 #b00000011)))
1174 (emit-ea segment src (reg-tn-encoding dst) allow-constants))
1176 (error "bogus operands to ~A" name)))))
1178 (eval-when (:compile-toplevel :execute)
1179 (defun arith-inst-printer-list (subop)
1180 `((accum-imm ((op ,(dpb subop (byte 3 2) #b0000010))))
1181 (reg/mem-imm ((op (#b1000000 ,subop))))
1182 (reg/mem-imm ((op (#b1000001 ,subop))
1183 (imm nil :type signed-imm-byte)))
1184 (reg-reg/mem-dir ((op ,(dpb subop (byte 3 1) #b000000))))))
1187 (define-instruction add (segment dst src)
1188 (:printer-list (arith-inst-printer-list #b000))
1189 (:emitter (emit-random-arith-inst "ADD" segment dst src #b000)))
1191 (define-instruction adc (segment dst src)
1192 (:printer-list (arith-inst-printer-list #b010))
1193 (:emitter (emit-random-arith-inst "ADC" segment dst src #b010)))
1195 (define-instruction sub (segment dst src)
1196 (:printer-list (arith-inst-printer-list #b101))
1197 (:emitter (emit-random-arith-inst "SUB" segment dst src #b101)))
1199 (define-instruction sbb (segment dst src)
1200 (:printer-list (arith-inst-printer-list #b011))
1201 (:emitter (emit-random-arith-inst "SBB" segment dst src #b011)))
1203 (define-instruction cmp (segment dst src)
1204 (:printer-list (arith-inst-printer-list #b111))
1205 (:emitter (emit-random-arith-inst "CMP" segment dst src #b111 t)))
1207 (define-instruction inc (segment dst)
1209 (:printer reg-no-width ((op #b01000)))
1211 (:printer reg/mem ((op '(#b1111111 #b000))))
1213 (let ((size (operand-size dst)))
1214 (maybe-emit-operand-size-prefix segment size)
1215 (cond ((and (not (eq size :byte)) (register-p dst))
1216 (emit-byte-with-reg segment #b01000 (reg-tn-encoding dst)))
1218 (emit-byte segment (if (eq size :byte) #b11111110 #b11111111))
1219 (emit-ea segment dst #b000))))))
1221 (define-instruction dec (segment dst)
1223 (:printer reg-no-width ((op #b01001)))
1225 (:printer reg/mem ((op '(#b1111111 #b001))))
1227 (let ((size (operand-size dst)))
1228 (maybe-emit-operand-size-prefix segment size)
1229 (cond ((and (not (eq size :byte)) (register-p dst))
1230 (emit-byte-with-reg segment #b01001 (reg-tn-encoding dst)))
1232 (emit-byte segment (if (eq size :byte) #b11111110 #b11111111))
1233 (emit-ea segment dst #b001))))))
1235 (define-instruction neg (segment dst)
1236 (:printer reg/mem ((op '(#b1111011 #b011))))
1238 (let ((size (operand-size dst)))
1239 (maybe-emit-operand-size-prefix segment size)
1240 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1241 (emit-ea segment dst #b011))))
1243 (define-instruction aaa (segment)
1244 (:printer byte ((op #b00110111)))
1246 (emit-byte segment #b00110111)))
1248 (define-instruction aas (segment)
1249 (:printer byte ((op #b00111111)))
1251 (emit-byte segment #b00111111)))
1253 (define-instruction daa (segment)
1254 (:printer byte ((op #b00100111)))
1256 (emit-byte segment #b00100111)))
1258 (define-instruction das (segment)
1259 (:printer byte ((op #b00101111)))
1261 (emit-byte segment #b00101111)))
1263 (define-instruction mul (segment dst src)
1264 (:printer accum-reg/mem ((op '(#b1111011 #b100))))
1266 (let ((size (matching-operand-size dst src)))
1267 (aver (accumulator-p dst))
1268 (maybe-emit-operand-size-prefix segment size)
1269 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1270 (emit-ea segment src #b100))))
1272 (define-instruction imul (segment dst &optional src1 src2)
1273 (:printer accum-reg/mem ((op '(#b1111011 #b101))))
1274 (:printer ext-reg-reg/mem ((op #b1010111)))
1275 (:printer reg-reg/mem ((op #b0110100) (width 1) (imm nil :type 'imm-word))
1276 '(:name :tab reg ", " reg/mem ", " imm))
1277 (:printer reg-reg/mem ((op #b0110101) (width 1)
1278 (imm nil :type 'signed-imm-byte))
1279 '(:name :tab reg ", " reg/mem ", " imm))
1281 (flet ((r/m-with-immed-to-reg (reg r/m immed)
1282 (let* ((size (matching-operand-size reg r/m))
1283 (sx (and (not (eq size :byte)) (<= -128 immed 127))))
1284 (maybe-emit-operand-size-prefix segment size)
1285 (emit-byte segment (if sx #b01101011 #b01101001))
1286 (emit-ea segment r/m (reg-tn-encoding reg))
1288 (emit-byte segment immed)
1289 (emit-sized-immediate segment size immed)))))
1291 (r/m-with-immed-to-reg dst src1 src2))
1294 (r/m-with-immed-to-reg dst dst src1)
1295 (let ((size (matching-operand-size dst src1)))
1296 (maybe-emit-operand-size-prefix segment size)
1297 (emit-byte segment #b00001111)
1298 (emit-byte segment #b10101111)
1299 (emit-ea segment src1 (reg-tn-encoding dst)))))
1301 (let ((size (operand-size dst)))
1302 (maybe-emit-operand-size-prefix segment size)
1303 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1304 (emit-ea segment dst #b101)))))))
1306 (define-instruction div (segment dst src)
1307 (:printer accum-reg/mem ((op '(#b1111011 #b110))))
1309 (let ((size (matching-operand-size dst src)))
1310 (aver (accumulator-p dst))
1311 (maybe-emit-operand-size-prefix segment size)
1312 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1313 (emit-ea segment src #b110))))
1315 (define-instruction idiv (segment dst src)
1316 (:printer accum-reg/mem ((op '(#b1111011 #b111))))
1318 (let ((size (matching-operand-size dst src)))
1319 (aver (accumulator-p dst))
1320 (maybe-emit-operand-size-prefix segment size)
1321 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1322 (emit-ea segment src #b111))))
1324 (define-instruction aad (segment)
1325 (:printer two-bytes ((op '(#b11010101 #b00001010))))
1327 (emit-byte segment #b11010101)
1328 (emit-byte segment #b00001010)))
1330 (define-instruction aam (segment)
1331 (:printer two-bytes ((op '(#b11010100 #b00001010))))
1333 (emit-byte segment #b11010100)
1334 (emit-byte segment #b00001010)))
1336 ;;; CBW -- Convert Byte to Word. AX <- sign_xtnd(AL)
1337 (define-instruction cbw (segment)
1339 (maybe-emit-operand-size-prefix segment :word)
1340 (emit-byte segment #b10011000)))
1342 ;;; CWDE -- Convert Word To Double Word Extened. EAX <- sign_xtnd(AX)
1343 (define-instruction cwde (segment)
1345 (maybe-emit-operand-size-prefix segment :dword)
1346 (emit-byte segment #b10011000)))
1348 ;;; CWD -- Convert Word to Double Word. DX:AX <- sign_xtnd(AX)
1349 (define-instruction cwd (segment)
1351 (maybe-emit-operand-size-prefix segment :word)
1352 (emit-byte segment #b10011001)))
1354 ;;; CDQ -- Convert Double Word to Quad Word. EDX:EAX <- sign_xtnd(EAX)
1355 (define-instruction cdq (segment)
1356 (:printer byte ((op #b10011001)))
1358 (maybe-emit-operand-size-prefix segment :dword)
1359 (emit-byte segment #b10011001)))
1361 (define-instruction xadd (segment dst src)
1362 ;; Register/Memory with Register.
1363 (:printer ext-reg-reg/mem ((op #b1100000)) '(:name :tab reg/mem ", " reg))
1365 (aver (register-p src))
1366 (let ((size (matching-operand-size src dst)))
1367 (maybe-emit-operand-size-prefix segment size)
1368 (emit-byte segment #b00001111)
1369 (emit-byte segment (if (eq size :byte) #b11000000 #b11000001))
1370 (emit-ea segment dst (reg-tn-encoding src)))))
1375 (defun emit-shift-inst (segment dst amount opcode)
1376 (let ((size (operand-size dst)))
1377 (maybe-emit-operand-size-prefix segment size)
1378 (multiple-value-bind (major-opcode immed)
1380 (:cl (values #b11010010 nil))
1381 (1 (values #b11010000 nil))
1382 (t (values #b11000000 t)))
1384 (if (eq size :byte) major-opcode (logior major-opcode 1)))
1385 (emit-ea segment dst opcode)
1387 (emit-byte segment amount)))))
1389 (eval-when (:compile-toplevel :execute)
1390 (defun shift-inst-printer-list (subop)
1391 `((reg/mem ((op (#b1101000 ,subop)))
1392 (:name :tab reg/mem ", 1"))
1393 (reg/mem ((op (#b1101001 ,subop)))
1394 (:name :tab reg/mem ", " 'cl))
1395 (reg/mem-imm ((op (#b1100000 ,subop))
1396 (imm nil :type signed-imm-byte))))))
1398 (define-instruction rol (segment dst amount)
1400 (shift-inst-printer-list #b000))
1402 (emit-shift-inst segment dst amount #b000)))
1404 (define-instruction ror (segment dst amount)
1406 (shift-inst-printer-list #b001))
1408 (emit-shift-inst segment dst amount #b001)))
1410 (define-instruction rcl (segment dst amount)
1412 (shift-inst-printer-list #b010))
1414 (emit-shift-inst segment dst amount #b010)))
1416 (define-instruction rcr (segment dst amount)
1418 (shift-inst-printer-list #b011))
1420 (emit-shift-inst segment dst amount #b011)))
1422 (define-instruction shl (segment dst amount)
1424 (shift-inst-printer-list #b100))
1426 (emit-shift-inst segment dst amount #b100)))
1428 (define-instruction shr (segment dst amount)
1430 (shift-inst-printer-list #b101))
1432 (emit-shift-inst segment dst amount #b101)))
1434 (define-instruction sar (segment dst amount)
1436 (shift-inst-printer-list #b111))
1438 (emit-shift-inst segment dst amount #b111)))
1440 (defun emit-double-shift (segment opcode dst src amt)
1441 (let ((size (matching-operand-size dst src)))
1442 (when (eq size :byte)
1443 (error "Double shifts can only be used with words."))
1444 (maybe-emit-operand-size-prefix segment size)
1445 (emit-byte segment #b00001111)
1446 (emit-byte segment (dpb opcode (byte 1 3)
1447 (if (eq amt :cl) #b10100101 #b10100100)))
1449 (emit-ea segment dst src)
1450 (emit-ea segment dst (reg-tn-encoding src)) ; pw tries this
1451 (unless (eq amt :cl)
1452 (emit-byte segment amt))))
1454 (eval-when (:compile-toplevel :execute)
1455 (defun double-shift-inst-printer-list (op)
1457 (ext-reg-reg/mem-imm ((op ,(logior op #b100))
1458 (imm nil :type signed-imm-byte)))
1459 (ext-reg-reg/mem ((op ,(logior op #b101)))
1460 (:name :tab reg/mem ", " 'cl)))))
1462 (define-instruction shld (segment dst src amt)
1463 (:declare (type (or (member :cl) (mod 32)) amt))
1464 (:printer-list (double-shift-inst-printer-list #b10100000))
1466 (emit-double-shift segment #b0 dst src amt)))
1468 (define-instruction shrd (segment dst src amt)
1469 (:declare (type (or (member :cl) (mod 32)) amt))
1470 (:printer-list (double-shift-inst-printer-list #b10101000))
1472 (emit-double-shift segment #b1 dst src amt)))
1474 (define-instruction and (segment dst src)
1476 (arith-inst-printer-list #b100))
1478 (emit-random-arith-inst "AND" segment dst src #b100)))
1480 (define-instruction test (segment this that)
1481 (:printer accum-imm ((op #b1010100)))
1482 (:printer reg/mem-imm ((op '(#b1111011 #b000))))
1483 (:printer reg-reg/mem ((op #b1000010)))
1485 (let ((size (matching-operand-size this that)))
1486 (maybe-emit-operand-size-prefix segment size)
1487 (flet ((test-immed-and-something (immed something)
1488 (cond ((accumulator-p something)
1490 (if (eq size :byte) #b10101000 #b10101001))
1491 (emit-sized-immediate segment size immed))
1494 (if (eq size :byte) #b11110110 #b11110111))
1495 (emit-ea segment something #b000)
1496 (emit-sized-immediate segment size immed))))
1497 (test-reg-and-something (reg something)
1498 (emit-byte segment (if (eq size :byte) #b10000100 #b10000101))
1499 (emit-ea segment something (reg-tn-encoding reg))))
1500 (cond ((integerp that)
1501 (test-immed-and-something that this))
1503 (test-immed-and-something this that))
1505 (test-reg-and-something this that))
1507 (test-reg-and-something that this))
1509 (error "bogus operands for TEST: ~S and ~S" this that)))))))
1511 (define-instruction or (segment dst src)
1513 (arith-inst-printer-list #b001))
1515 (emit-random-arith-inst "OR" segment dst src #b001)))
1517 (define-instruction xor (segment dst src)
1519 (arith-inst-printer-list #b110))
1521 (emit-random-arith-inst "XOR" segment dst src #b110)))
1523 (define-instruction not (segment dst)
1524 (:printer reg/mem ((op '(#b1111011 #b010))))
1526 (let ((size (operand-size dst)))
1527 (maybe-emit-operand-size-prefix segment size)
1528 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1529 (emit-ea segment dst #b010))))
1531 ;;;; string manipulation
1533 (define-instruction cmps (segment size)
1534 (:printer string-op ((op #b1010011)))
1536 (maybe-emit-operand-size-prefix segment size)
1537 (emit-byte segment (if (eq size :byte) #b10100110 #b10100111))))
1539 (define-instruction ins (segment acc)
1540 (:printer string-op ((op #b0110110)))
1542 (let ((size (operand-size acc)))
1543 (aver (accumulator-p acc))
1544 (maybe-emit-operand-size-prefix segment size)
1545 (emit-byte segment (if (eq size :byte) #b01101100 #b01101101)))))
1547 (define-instruction lods (segment acc)
1548 (:printer string-op ((op #b1010110)))
1550 (let ((size (operand-size acc)))
1551 (aver (accumulator-p acc))
1552 (maybe-emit-operand-size-prefix segment size)
1553 (emit-byte segment (if (eq size :byte) #b10101100 #b10101101)))))
1555 (define-instruction movs (segment size)
1556 (:printer string-op ((op #b1010010)))
1558 (maybe-emit-operand-size-prefix segment size)
1559 (emit-byte segment (if (eq size :byte) #b10100100 #b10100101))))
1561 (define-instruction outs (segment acc)
1562 (:printer string-op ((op #b0110111)))
1564 (let ((size (operand-size acc)))
1565 (aver (accumulator-p acc))
1566 (maybe-emit-operand-size-prefix segment size)
1567 (emit-byte segment (if (eq size :byte) #b01101110 #b01101111)))))
1569 (define-instruction scas (segment acc)
1570 (:printer string-op ((op #b1010111)))
1572 (let ((size (operand-size acc)))
1573 (aver (accumulator-p acc))
1574 (maybe-emit-operand-size-prefix segment size)
1575 (emit-byte segment (if (eq size :byte) #b10101110 #b10101111)))))
1577 (define-instruction stos (segment acc)
1578 (:printer string-op ((op #b1010101)))
1580 (let ((size (operand-size acc)))
1581 (aver (accumulator-p acc))
1582 (maybe-emit-operand-size-prefix segment size)
1583 (emit-byte segment (if (eq size :byte) #b10101010 #b10101011)))))
1585 (define-instruction xlat (segment)
1586 (:printer byte ((op #b11010111)))
1588 (emit-byte segment #b11010111)))
1590 (define-instruction rep (segment)
1592 (emit-byte segment #b11110010)))
1594 (define-instruction repe (segment)
1595 (:printer byte ((op #b11110011)))
1597 (emit-byte segment #b11110011)))
1599 (define-instruction repne (segment)
1600 (:printer byte ((op #b11110010)))
1602 (emit-byte segment #b11110010)))
1605 ;;;; bit manipulation
1607 (define-instruction bsf (segment dst src)
1608 (:printer ext-reg-reg/mem ((op #b1011110) (width 0)))
1610 (let ((size (matching-operand-size dst src)))
1611 (when (eq size :byte)
1612 (error "can't scan bytes: ~S" src))
1613 (maybe-emit-operand-size-prefix segment size)
1614 (emit-byte segment #b00001111)
1615 (emit-byte segment #b10111100)
1616 (emit-ea segment src (reg-tn-encoding dst)))))
1618 (define-instruction bsr (segment dst src)
1619 (:printer ext-reg-reg/mem ((op #b1011110) (width 1)))
1621 (let ((size (matching-operand-size dst src)))
1622 (when (eq size :byte)
1623 (error "can't scan bytes: ~S" src))
1624 (maybe-emit-operand-size-prefix segment size)
1625 (emit-byte segment #b00001111)
1626 (emit-byte segment #b10111101)
1627 (emit-ea segment src (reg-tn-encoding dst)))))
1629 (defun emit-bit-test-and-mumble (segment src index opcode)
1630 (let ((size (operand-size src)))
1631 (when (eq size :byte)
1632 (error "can't scan bytes: ~S" src))
1633 (maybe-emit-operand-size-prefix segment size)
1634 (emit-byte segment #b00001111)
1635 (cond ((integerp index)
1636 (emit-byte segment #b10111010)
1637 (emit-ea segment src opcode)
1638 (emit-byte segment index))
1640 (emit-byte segment (dpb opcode (byte 3 3) #b10000011))
1641 (emit-ea segment src (reg-tn-encoding index))))))
1643 (eval-when (:compile-toplevel :execute)
1644 (defun bit-test-inst-printer-list (subop)
1645 `((ext-reg/mem-imm ((op (#b1011101 ,subop))
1646 (reg/mem nil :type word-reg/mem)
1647 (imm nil :type imm-data)
1649 (ext-reg-reg/mem ((op ,(dpb subop (byte 3 2) #b1000001))
1651 (:name :tab reg/mem ", " reg)))))
1653 (define-instruction bt (segment src index)
1654 (:printer-list (bit-test-inst-printer-list #b100))
1656 (emit-bit-test-and-mumble segment src index #b100)))
1658 (define-instruction btc (segment src index)
1659 (:printer-list (bit-test-inst-printer-list #b111))
1661 (emit-bit-test-and-mumble segment src index #b111)))
1663 (define-instruction btr (segment src index)
1664 (:printer-list (bit-test-inst-printer-list #b110))
1666 (emit-bit-test-and-mumble segment src index #b110)))
1668 (define-instruction bts (segment src index)
1669 (:printer-list (bit-test-inst-printer-list #b101))
1671 (emit-bit-test-and-mumble segment src index #b101)))
1674 ;;;; control transfer
1676 (define-instruction call (segment where)
1677 (:printer near-jump ((op #b11101000)))
1678 (:printer reg/mem ((op '(#b1111111 #b010)) (width 1)))
1682 (emit-byte segment #b11101000)
1683 (emit-back-patch segment
1685 (lambda (segment posn)
1687 (- (label-position where)
1690 (emit-byte segment #b11101000)
1691 (emit-relative-fixup segment where))
1693 (emit-byte segment #b11111111)
1694 (emit-ea segment where #b010)))))
1696 (defun emit-byte-displacement-backpatch (segment target)
1697 (emit-back-patch segment
1699 (lambda (segment posn)
1700 (let ((disp (- (label-position target) (1+ posn))))
1701 (aver (<= -128 disp 127))
1702 (emit-byte segment disp)))))
1704 (define-instruction jmp (segment cond &optional where)
1705 ;; conditional jumps
1706 (:printer short-cond-jump ((op #b0111)) '('j cc :tab label))
1707 (:printer near-cond-jump () '('j cc :tab label))
1708 ;; unconditional jumps
1709 (:printer short-jump ((op #b1011)))
1710 (:printer near-jump ((op #b11101001)) )
1711 (:printer reg/mem ((op '(#b1111111 #b100)) (width 1)))
1716 (lambda (segment posn delta-if-after)
1717 (let ((disp (- (label-position where posn delta-if-after)
1719 (when (<= -128 disp 127)
1721 (dpb (conditional-opcode cond)
1724 (emit-byte-displacement-backpatch segment where)
1726 (lambda (segment posn)
1727 (let ((disp (- (label-position where) (+ posn 6))))
1728 (emit-byte segment #b00001111)
1730 (dpb (conditional-opcode cond)
1733 (emit-dword segment disp)))))
1734 ((label-p (setq where cond))
1737 (lambda (segment posn delta-if-after)
1738 (let ((disp (- (label-position where posn delta-if-after)
1740 (when (<= -128 disp 127)
1741 (emit-byte segment #b11101011)
1742 (emit-byte-displacement-backpatch segment where)
1744 (lambda (segment posn)
1745 (let ((disp (- (label-position where) (+ posn 5))))
1746 (emit-byte segment #b11101001)
1747 (emit-dword segment disp)))))
1749 (emit-byte segment #b11101001)
1750 (emit-relative-fixup segment where))
1752 (unless (or (ea-p where) (tn-p where))
1753 (error "don't know what to do with ~A" where))
1754 (emit-byte segment #b11111111)
1755 (emit-ea segment where #b100)))))
1757 (define-instruction jmp-short (segment label)
1759 (emit-byte segment #b11101011)
1760 (emit-byte-displacement-backpatch segment label)))
1762 (define-instruction ret (segment &optional stack-delta)
1763 (:printer byte ((op #b11000011)))
1764 (:printer byte ((op #b11000010) (imm nil :type 'imm-word-16))
1768 (emit-byte segment #b11000010)
1769 (emit-word segment stack-delta))
1771 (emit-byte segment #b11000011)))))
1773 (define-instruction jecxz (segment target)
1774 (:printer short-jump ((op #b0011)))
1776 (emit-byte segment #b11100011)
1777 (emit-byte-displacement-backpatch segment target)))
1779 (define-instruction loop (segment target)
1780 (:printer short-jump ((op #b0010)))
1782 (emit-byte segment #b11100010) ; pfw this was 11100011, or jecxz!!!!
1783 (emit-byte-displacement-backpatch segment target)))
1785 (define-instruction loopz (segment target)
1786 (:printer short-jump ((op #b0001)))
1788 (emit-byte segment #b11100001)
1789 (emit-byte-displacement-backpatch segment target)))
1791 (define-instruction loopnz (segment target)
1792 (:printer short-jump ((op #b0000)))
1794 (emit-byte segment #b11100000)
1795 (emit-byte-displacement-backpatch segment target)))
1797 ;;;; conditional move
1798 (define-instruction cmov (segment cond dst src)
1799 (:printer cond-move ())
1801 (aver (register-p dst))
1802 (let ((size (matching-operand-size dst src)))
1803 (aver (or (eq size :word) (eq size :dword)))
1804 (maybe-emit-operand-size-prefix segment size))
1805 (emit-byte segment #b00001111)
1806 (emit-byte segment (dpb (conditional-opcode cond) (byte 4 0) #b01000000))
1807 (emit-ea segment src (reg-tn-encoding dst))))
1809 ;;;; conditional byte set
1811 (define-instruction set (segment dst cond)
1812 (:printer cond-set ())
1814 (emit-byte segment #b00001111)
1815 (emit-byte segment (dpb (conditional-opcode cond) (byte 4 0) #b10010000))
1816 (emit-ea segment dst #b000)))
1820 (define-instruction enter (segment disp &optional (level 0))
1821 (:declare (type (unsigned-byte 16) disp)
1822 (type (unsigned-byte 8) level))
1823 (:printer enter-format ((op #b11001000)))
1825 (emit-byte segment #b11001000)
1826 (emit-word segment disp)
1827 (emit-byte segment level)))
1829 (define-instruction leave (segment)
1830 (:printer byte ((op #b11001001)))
1832 (emit-byte segment #b11001001)))
1834 ;;;; interrupt instructions
1836 (defun snarf-error-junk (sap offset &optional length-only)
1837 (let* ((length (sb!sys:sap-ref-8 sap offset))
1838 (vector (make-array length :element-type '(unsigned-byte 8))))
1839 (declare (type sb!sys:system-area-pointer sap)
1840 (type (unsigned-byte 8) length)
1841 (type (simple-array (unsigned-byte 8) (*)) vector))
1843 (values 0 (1+ length) nil nil))
1845 (sb!kernel:copy-from-system-area sap (* n-byte-bits (1+ offset))
1846 vector (* n-word-bits
1848 (* length n-byte-bits))
1849 (collect ((sc-offsets)
1851 (lengths 1) ; the length byte
1853 (error-number (sb!c:read-var-integer vector index)))
1856 (when (>= index length)
1858 (let ((old-index index))
1859 (sc-offsets (sb!c:read-var-integer vector index))
1860 (lengths (- index old-index))))
1861 (values error-number
1867 (defmacro break-cases (breaknum &body cases)
1868 (let ((bn-temp (gensym)))
1869 (collect ((clauses))
1870 (dolist (case cases)
1871 (clauses `((= ,bn-temp ,(car case)) ,@(cdr case))))
1872 `(let ((,bn-temp ,breaknum))
1873 (cond ,@(clauses))))))
1876 (defun break-control (chunk inst stream dstate)
1877 (declare (ignore inst))
1878 (flet ((nt (x) (if stream (sb!disassem:note x dstate))))
1879 ;; FIXME: Make sure that BYTE-IMM-CODE is defined. The genesis
1880 ;; map has it undefined; and it should be easier to look in the target
1881 ;; Lisp (with (DESCRIBE 'BYTE-IMM-CODE)) than to definitively deduce
1882 ;; from first principles whether it's defined in some way that genesis
1884 (case (byte-imm-code chunk dstate)
1887 (sb!disassem:handle-break-args #'snarf-error-junk stream dstate))
1890 (sb!disassem:handle-break-args #'snarf-error-junk stream dstate))
1892 (nt "breakpoint trap"))
1893 (#.pending-interrupt-trap
1894 (nt "pending interrupt trap"))
1897 (#.fun-end-breakpoint-trap
1898 (nt "function end breakpoint trap")))))
1900 (define-instruction break (segment code)
1901 (:declare (type (unsigned-byte 8) code))
1902 (:printer byte-imm ((op #b11001100)) '(:name :tab code)
1903 :control #'break-control)
1905 (emit-byte segment #b11001100)
1906 (emit-byte segment code)))
1908 (define-instruction int (segment number)
1909 (:declare (type (unsigned-byte 8) number))
1910 (:printer byte-imm ((op #b11001101)))
1914 (emit-byte segment #b11001100))
1916 (emit-byte segment #b11001101)
1917 (emit-byte segment number)))))
1919 (define-instruction into (segment)
1920 (:printer byte ((op #b11001110)))
1922 (emit-byte segment #b11001110)))
1924 (define-instruction bound (segment reg bounds)
1926 (let ((size (matching-operand-size reg bounds)))
1927 (when (eq size :byte)
1928 (error "can't bounds-test bytes: ~S" reg))
1929 (maybe-emit-operand-size-prefix segment size)
1930 (emit-byte segment #b01100010)
1931 (emit-ea segment bounds (reg-tn-encoding reg)))))
1933 (define-instruction iret (segment)
1934 (:printer byte ((op #b11001111)))
1936 (emit-byte segment #b11001111)))
1938 ;;;; processor control
1940 (define-instruction hlt (segment)
1941 (:printer byte ((op #b11110100)))
1943 (emit-byte segment #b11110100)))
1945 (define-instruction nop (segment)
1946 (:printer byte ((op #b10010000)))
1948 (emit-byte segment #b10010000)))
1950 (define-instruction wait (segment)
1951 (:printer byte ((op #b10011011)))
1953 (emit-byte segment #b10011011)))
1955 (define-instruction lock (segment)
1956 (:printer byte ((op #b11110000)))
1958 (emit-byte segment #b11110000)))
1960 ;;;; miscellaneous hackery
1962 (define-instruction byte (segment byte)
1964 (emit-byte segment byte)))
1966 (define-instruction word (segment word)
1968 (emit-word segment word)))
1970 (define-instruction dword (segment dword)
1972 (emit-dword segment dword)))
1974 (defun emit-header-data (segment type)
1975 (emit-back-patch segment
1977 (lambda (segment posn)
1981 (component-header-length))
1985 (define-instruction simple-fun-header-word (segment)
1987 (emit-header-data segment simple-fun-header-widetag)))
1989 (define-instruction lra-header-word (segment)
1991 (emit-header-data segment return-pc-header-widetag)))
1993 ;;;; fp instructions
1995 ;;;; FIXME: This section said "added by jrd", which should end up in CREDITS.
1997 ;;;; Note: We treat the single-precision and double-precision variants
1998 ;;;; as separate instructions.
2000 ;;; Load single to st(0).
2001 (define-instruction fld (segment source)
2002 (:printer floating-point ((op '(#b001 #b000))))
2004 (emit-byte segment #b11011001)
2005 (emit-fp-op segment source #b000)))
2007 ;;; Load double to st(0).
2008 (define-instruction fldd (segment source)
2009 (:printer floating-point ((op '(#b101 #b000))))
2010 (:printer floating-point-fp ((op '(#b001 #b000))))
2012 (if (fp-reg-tn-p source)
2013 (emit-byte segment #b11011001)
2014 (emit-byte segment #b11011101))
2015 (emit-fp-op segment source #b000)))
2017 ;;; Load long to st(0).
2018 (define-instruction fldl (segment source)
2019 (:printer floating-point ((op '(#b011 #b101))))
2021 (emit-byte segment #b11011011)
2022 (emit-fp-op segment source #b101)))
2024 ;;; Store single from st(0).
2025 (define-instruction fst (segment dest)
2026 (:printer floating-point ((op '(#b001 #b010))))
2028 (cond ((fp-reg-tn-p dest)
2029 (emit-byte segment #b11011101)
2030 (emit-fp-op segment dest #b010))
2032 (emit-byte segment #b11011001)
2033 (emit-fp-op segment dest #b010)))))
2035 ;;; Store double from st(0).
2036 (define-instruction fstd (segment dest)
2037 (:printer floating-point ((op '(#b101 #b010))))
2038 (:printer floating-point-fp ((op '(#b101 #b010))))
2040 (cond ((fp-reg-tn-p dest)
2041 (emit-byte segment #b11011101)
2042 (emit-fp-op segment dest #b010))
2044 (emit-byte segment #b11011101)
2045 (emit-fp-op segment dest #b010)))))
2047 ;;; Arithmetic ops are all done with at least one operand at top of
2048 ;;; stack. The other operand is is another register or a 32/64 bit
2051 ;;; dtc: I've tried to follow the Intel ASM386 conventions, but note
2052 ;;; that these conflict with the Gdb conventions for binops. To reduce
2053 ;;; the confusion I've added comments showing the mathamatical
2054 ;;; operation and the two syntaxes. By the ASM386 convention the
2055 ;;; instruction syntax is:
2058 ;;; or Fop Destination, Source
2060 ;;; If only one operand is given then it is the source and the
2061 ;;; destination is ST(0). There are reversed forms of the fsub and
2062 ;;; fdiv instructions inducated by an 'R' suffix.
2064 ;;; The mathematical operation for the non-reverse form is always:
2065 ;;; destination = destination op source
2067 ;;; For the reversed form it is:
2068 ;;; destination = source op destination
2070 ;;; The instructions below only accept one operand at present which is
2071 ;;; usually the source. I've hack in extra instructions to implement
2072 ;;; the fops with a ST(i) destination, these have a -sti suffix and
2073 ;;; the operand is the destination with the source being ST(0).
2076 ;;; st(0) = st(0) + memory or st(i).
2077 (define-instruction fadd (segment source)
2078 (:printer floating-point ((op '(#b000 #b000))))
2080 (emit-byte segment #b11011000)
2081 (emit-fp-op segment source #b000)))
2084 ;;; st(0) = st(0) + memory or st(i).
2085 (define-instruction faddd (segment source)
2086 (:printer floating-point ((op '(#b100 #b000))))
2087 (:printer floating-point-fp ((op '(#b000 #b000))))
2089 (if (fp-reg-tn-p source)
2090 (emit-byte segment #b11011000)
2091 (emit-byte segment #b11011100))
2092 (emit-fp-op segment source #b000)))
2094 ;;; Add double destination st(i):
2095 ;;; st(i) = st(0) + st(i).
2096 (define-instruction fadd-sti (segment destination)
2097 (:printer floating-point-fp ((op '(#b100 #b000))))
2099 (aver (fp-reg-tn-p destination))
2100 (emit-byte segment #b11011100)
2101 (emit-fp-op segment destination #b000)))
2103 (define-instruction faddp-sti (segment destination)
2104 (:printer floating-point-fp ((op '(#b110 #b000))))
2106 (aver (fp-reg-tn-p destination))
2107 (emit-byte segment #b11011110)
2108 (emit-fp-op segment destination #b000)))
2110 ;;; Subtract single:
2111 ;;; st(0) = st(0) - memory or st(i).
2112 (define-instruction fsub (segment source)
2113 (:printer floating-point ((op '(#b000 #b100))))
2115 (emit-byte segment #b11011000)
2116 (emit-fp-op segment source #b100)))
2118 ;;; Subtract single, reverse:
2119 ;;; st(0) = memory or st(i) - st(0).
2120 (define-instruction fsubr (segment source)
2121 (:printer floating-point ((op '(#b000 #b101))))
2123 (emit-byte segment #b11011000)
2124 (emit-fp-op segment source #b101)))
2126 ;;; Subtract double:
2127 ;;; st(0) = st(0) - memory or st(i).
2128 (define-instruction fsubd (segment source)
2129 (:printer floating-point ((op '(#b100 #b100))))
2130 (:printer floating-point-fp ((op '(#b000 #b100))))
2132 (if (fp-reg-tn-p source)
2133 (emit-byte segment #b11011000)
2134 (emit-byte segment #b11011100))
2135 (emit-fp-op segment source #b100)))
2137 ;;; Subtract double, reverse:
2138 ;;; st(0) = memory or st(i) - st(0).
2139 (define-instruction fsubrd (segment source)
2140 (:printer floating-point ((op '(#b100 #b101))))
2141 (:printer floating-point-fp ((op '(#b000 #b101))))
2143 (if (fp-reg-tn-p source)
2144 (emit-byte segment #b11011000)
2145 (emit-byte segment #b11011100))
2146 (emit-fp-op segment source #b101)))
2148 ;;; Subtract double, destination st(i):
2149 ;;; st(i) = st(i) - st(0).
2151 ;;; ASM386 syntax: FSUB ST(i), ST
2152 ;;; Gdb syntax: fsubr %st,%st(i)
2153 (define-instruction fsub-sti (segment destination)
2154 (:printer floating-point-fp ((op '(#b100 #b101))))
2156 (aver (fp-reg-tn-p destination))
2157 (emit-byte segment #b11011100)
2158 (emit-fp-op segment destination #b101)))
2160 (define-instruction fsubp-sti (segment destination)
2161 (:printer floating-point-fp ((op '(#b110 #b101))))
2163 (aver (fp-reg-tn-p destination))
2164 (emit-byte segment #b11011110)
2165 (emit-fp-op segment destination #b101)))
2167 ;;; Subtract double, reverse, destination st(i):
2168 ;;; st(i) = st(0) - st(i).
2170 ;;; ASM386 syntax: FSUBR ST(i), ST
2171 ;;; Gdb syntax: fsub %st,%st(i)
2172 (define-instruction fsubr-sti (segment destination)
2173 (:printer floating-point-fp ((op '(#b100 #b100))))
2175 (aver (fp-reg-tn-p destination))
2176 (emit-byte segment #b11011100)
2177 (emit-fp-op segment destination #b100)))
2179 (define-instruction fsubrp-sti (segment destination)
2180 (:printer floating-point-fp ((op '(#b110 #b100))))
2182 (aver (fp-reg-tn-p destination))
2183 (emit-byte segment #b11011110)
2184 (emit-fp-op segment destination #b100)))
2186 ;;; Multiply single:
2187 ;;; st(0) = st(0) * memory or st(i).
2188 (define-instruction fmul (segment source)
2189 (:printer floating-point ((op '(#b000 #b001))))
2191 (emit-byte segment #b11011000)
2192 (emit-fp-op segment source #b001)))
2194 ;;; Multiply double:
2195 ;;; st(0) = st(0) * memory or st(i).
2196 (define-instruction fmuld (segment source)
2197 (:printer floating-point ((op '(#b100 #b001))))
2198 (:printer floating-point-fp ((op '(#b000 #b001))))
2200 (if (fp-reg-tn-p source)
2201 (emit-byte segment #b11011000)
2202 (emit-byte segment #b11011100))
2203 (emit-fp-op segment source #b001)))
2205 ;;; Multiply double, destination st(i):
2206 ;;; st(i) = st(i) * st(0).
2207 (define-instruction fmul-sti (segment destination)
2208 (:printer floating-point-fp ((op '(#b100 #b001))))
2210 (aver (fp-reg-tn-p destination))
2211 (emit-byte segment #b11011100)
2212 (emit-fp-op segment destination #b001)))
2215 ;;; st(0) = st(0) / memory or st(i).
2216 (define-instruction fdiv (segment source)
2217 (:printer floating-point ((op '(#b000 #b110))))
2219 (emit-byte segment #b11011000)
2220 (emit-fp-op segment source #b110)))
2222 ;;; Divide single, reverse:
2223 ;;; st(0) = memory or st(i) / st(0).
2224 (define-instruction fdivr (segment source)
2225 (:printer floating-point ((op '(#b000 #b111))))
2227 (emit-byte segment #b11011000)
2228 (emit-fp-op segment source #b111)))
2231 ;;; st(0) = st(0) / memory or st(i).
2232 (define-instruction fdivd (segment source)
2233 (:printer floating-point ((op '(#b100 #b110))))
2234 (:printer floating-point-fp ((op '(#b000 #b110))))
2236 (if (fp-reg-tn-p source)
2237 (emit-byte segment #b11011000)
2238 (emit-byte segment #b11011100))
2239 (emit-fp-op segment source #b110)))
2241 ;;; Divide double, reverse:
2242 ;;; st(0) = memory or st(i) / st(0).
2243 (define-instruction fdivrd (segment source)
2244 (:printer floating-point ((op '(#b100 #b111))))
2245 (:printer floating-point-fp ((op '(#b000 #b111))))
2247 (if (fp-reg-tn-p source)
2248 (emit-byte segment #b11011000)
2249 (emit-byte segment #b11011100))
2250 (emit-fp-op segment source #b111)))
2252 ;;; Divide double, destination st(i):
2253 ;;; st(i) = st(i) / st(0).
2255 ;;; ASM386 syntax: FDIV ST(i), ST
2256 ;;; Gdb syntax: fdivr %st,%st(i)
2257 (define-instruction fdiv-sti (segment destination)
2258 (:printer floating-point-fp ((op '(#b100 #b111))))
2260 (aver (fp-reg-tn-p destination))
2261 (emit-byte segment #b11011100)
2262 (emit-fp-op segment destination #b111)))
2264 ;;; Divide double, reverse, destination st(i):
2265 ;;; st(i) = st(0) / st(i).
2267 ;;; ASM386 syntax: FDIVR ST(i), ST
2268 ;;; Gdb syntax: fdiv %st,%st(i)
2269 (define-instruction fdivr-sti (segment destination)
2270 (:printer floating-point-fp ((op '(#b100 #b110))))
2272 (aver (fp-reg-tn-p destination))
2273 (emit-byte segment #b11011100)
2274 (emit-fp-op segment destination #b110)))
2276 ;;; Exchange fr0 with fr(n). (There is no double precision variant.)
2277 (define-instruction fxch (segment source)
2278 (:printer floating-point-fp ((op '(#b001 #b001))))
2280 (unless (and (tn-p source)
2281 (eq (sb-name (sc-sb (tn-sc source))) 'float-registers))
2283 (emit-byte segment #b11011001)
2284 (emit-fp-op segment source #b001)))
2286 ;;; Push 32-bit integer to st0.
2287 (define-instruction fild (segment source)
2288 (:printer floating-point ((op '(#b011 #b000))))
2290 (emit-byte segment #b11011011)
2291 (emit-fp-op segment source #b000)))
2293 ;;; Push 64-bit integer to st0.
2294 (define-instruction fildl (segment source)
2295 (:printer floating-point ((op '(#b111 #b101))))
2297 (emit-byte segment #b11011111)
2298 (emit-fp-op segment source #b101)))
2300 ;;; Store 32-bit integer.
2301 (define-instruction fist (segment dest)
2302 (:printer floating-point ((op '(#b011 #b010))))
2304 (emit-byte segment #b11011011)
2305 (emit-fp-op segment dest #b010)))
2307 ;;; Store and pop 32-bit integer.
2308 (define-instruction fistp (segment dest)
2309 (:printer floating-point ((op '(#b011 #b011))))
2311 (emit-byte segment #b11011011)
2312 (emit-fp-op segment dest #b011)))
2314 ;;; Store and pop 64-bit integer.
2315 (define-instruction fistpl (segment dest)
2316 (:printer floating-point ((op '(#b111 #b111))))
2318 (emit-byte segment #b11011111)
2319 (emit-fp-op segment dest #b111)))
2321 ;;; Store single from st(0) and pop.
2322 (define-instruction fstp (segment dest)
2323 (:printer floating-point ((op '(#b001 #b011))))
2325 (cond ((fp-reg-tn-p dest)
2326 (emit-byte segment #b11011101)
2327 (emit-fp-op segment dest #b011))
2329 (emit-byte segment #b11011001)
2330 (emit-fp-op segment dest #b011)))))
2332 ;;; Store double from st(0) and pop.
2333 (define-instruction fstpd (segment dest)
2334 (:printer floating-point ((op '(#b101 #b011))))
2335 (:printer floating-point-fp ((op '(#b101 #b011))))
2337 (cond ((fp-reg-tn-p dest)
2338 (emit-byte segment #b11011101)
2339 (emit-fp-op segment dest #b011))
2341 (emit-byte segment #b11011101)
2342 (emit-fp-op segment dest #b011)))))
2344 ;;; Store long from st(0) and pop.
2345 (define-instruction fstpl (segment dest)
2346 (:printer floating-point ((op '(#b011 #b111))))
2348 (emit-byte segment #b11011011)
2349 (emit-fp-op segment dest #b111)))
2351 ;;; Decrement stack-top pointer.
2352 (define-instruction fdecstp (segment)
2353 (:printer floating-point-no ((op #b10110)))
2355 (emit-byte segment #b11011001)
2356 (emit-byte segment #b11110110)))
2358 ;;; Increment stack-top pointer.
2359 (define-instruction fincstp (segment)
2360 (:printer floating-point-no ((op #b10111)))
2362 (emit-byte segment #b11011001)
2363 (emit-byte segment #b11110111)))
2365 ;;; Free fp register.
2366 (define-instruction ffree (segment dest)
2367 (:printer floating-point-fp ((op '(#b101 #b000))))
2369 (emit-byte segment #b11011101)
2370 (emit-fp-op segment dest #b000)))
2372 (define-instruction fabs (segment)
2373 (:printer floating-point-no ((op #b00001)))
2375 (emit-byte segment #b11011001)
2376 (emit-byte segment #b11100001)))
2378 (define-instruction fchs (segment)
2379 (:printer floating-point-no ((op #b00000)))
2381 (emit-byte segment #b11011001)
2382 (emit-byte segment #b11100000)))
2384 (define-instruction frndint(segment)
2385 (:printer floating-point-no ((op #b11100)))
2387 (emit-byte segment #b11011001)
2388 (emit-byte segment #b11111100)))
2391 (define-instruction fninit(segment)
2392 (:printer floating-point-5 ((op #b00011)))
2394 (emit-byte segment #b11011011)
2395 (emit-byte segment #b11100011)))
2397 ;;; Store Status Word to AX.
2398 (define-instruction fnstsw(segment)
2399 (:printer floating-point-st ((op #b00000)))
2401 (emit-byte segment #b11011111)
2402 (emit-byte segment #b11100000)))
2404 ;;; Load Control Word.
2406 ;;; src must be a memory location
2407 (define-instruction fldcw(segment src)
2408 (:printer floating-point ((op '(#b001 #b101))))
2410 (emit-byte segment #b11011001)
2411 (emit-fp-op segment src #b101)))
2413 ;;; Store Control Word.
2414 (define-instruction fnstcw(segment dst)
2415 (:printer floating-point ((op '(#b001 #b111))))
2417 (emit-byte segment #b11011001)
2418 (emit-fp-op segment dst #b111)))
2420 ;;; Store FP Environment.
2421 (define-instruction fstenv(segment dst)
2422 (:printer floating-point ((op '(#b001 #b110))))
2424 (emit-byte segment #b11011001)
2425 (emit-fp-op segment dst #b110)))
2427 ;;; Restore FP Environment.
2428 (define-instruction fldenv(segment src)
2429 (:printer floating-point ((op '(#b001 #b100))))
2431 (emit-byte segment #b11011001)
2432 (emit-fp-op segment src #b100)))
2435 (define-instruction fsave(segment dst)
2436 (:printer floating-point ((op '(#b101 #b110))))
2438 (emit-byte segment #b11011101)
2439 (emit-fp-op segment dst #b110)))
2441 ;;; Restore FP State.
2442 (define-instruction frstor(segment src)
2443 (:printer floating-point ((op '(#b101 #b100))))
2445 (emit-byte segment #b11011101)
2446 (emit-fp-op segment src #b100)))
2448 ;;; Clear exceptions.
2449 (define-instruction fnclex(segment)
2450 (:printer floating-point-5 ((op #b00010)))
2452 (emit-byte segment #b11011011)
2453 (emit-byte segment #b11100010)))
2456 (define-instruction fcom (segment src)
2457 (:printer floating-point ((op '(#b000 #b010))))
2459 (emit-byte segment #b11011000)
2460 (emit-fp-op segment src #b010)))
2462 (define-instruction fcomd (segment src)
2463 (:printer floating-point ((op '(#b100 #b010))))
2464 (:printer floating-point-fp ((op '(#b000 #b010))))
2466 (if (fp-reg-tn-p src)
2467 (emit-byte segment #b11011000)
2468 (emit-byte segment #b11011100))
2469 (emit-fp-op segment src #b010)))
2471 ;;; Compare ST1 to ST0, popping the stack twice.
2472 (define-instruction fcompp (segment)
2473 (:printer floating-point-3 ((op '(#b110 #b011001))))
2475 (emit-byte segment #b11011110)
2476 (emit-byte segment #b11011001)))
2478 ;;; unordered comparison
2479 (define-instruction fucom (segment src)
2480 (:printer floating-point-fp ((op '(#b101 #b100))))
2482 (aver (fp-reg-tn-p src))
2483 (emit-byte segment #b11011101)
2484 (emit-fp-op segment src #b100)))
2486 (define-instruction ftst (segment)
2487 (:printer floating-point-no ((op #b00100)))
2489 (emit-byte segment #b11011001)
2490 (emit-byte segment #b11100100)))
2494 (define-instruction fsqrt(segment)
2495 (:printer floating-point-no ((op #b11010)))
2497 (emit-byte segment #b11011001)
2498 (emit-byte segment #b11111010)))
2500 (define-instruction fscale(segment)
2501 (:printer floating-point-no ((op #b11101)))
2503 (emit-byte segment #b11011001)
2504 (emit-byte segment #b11111101)))
2506 (define-instruction fxtract(segment)
2507 (:printer floating-point-no ((op #b10100)))
2509 (emit-byte segment #b11011001)
2510 (emit-byte segment #b11110100)))
2512 (define-instruction fsin(segment)
2513 (:printer floating-point-no ((op #b11110)))
2515 (emit-byte segment #b11011001)
2516 (emit-byte segment #b11111110)))
2518 (define-instruction fcos(segment)
2519 (:printer floating-point-no ((op #b11111)))
2521 (emit-byte segment #b11011001)
2522 (emit-byte segment #b11111111)))
2524 (define-instruction fprem1(segment)
2525 (:printer floating-point-no ((op #b10101)))
2527 (emit-byte segment #b11011001)
2528 (emit-byte segment #b11110101)))
2530 (define-instruction fprem(segment)
2531 (:printer floating-point-no ((op #b11000)))
2533 (emit-byte segment #b11011001)
2534 (emit-byte segment #b11111000)))
2536 (define-instruction fxam (segment)
2537 (:printer floating-point-no ((op #b00101)))
2539 (emit-byte segment #b11011001)
2540 (emit-byte segment #b11100101)))
2542 ;;; These do push/pop to stack and need special handling
2543 ;;; in any VOPs that use them. See the book.
2545 ;;; st0 <- st1*log2(st0)
2546 (define-instruction fyl2x(segment) ; pops stack
2547 (:printer floating-point-no ((op #b10001)))
2549 (emit-byte segment #b11011001)
2550 (emit-byte segment #b11110001)))
2552 (define-instruction fyl2xp1(segment)
2553 (:printer floating-point-no ((op #b11001)))
2555 (emit-byte segment #b11011001)
2556 (emit-byte segment #b11111001)))
2558 (define-instruction f2xm1(segment)
2559 (:printer floating-point-no ((op #b10000)))
2561 (emit-byte segment #b11011001)
2562 (emit-byte segment #b11110000)))
2564 (define-instruction fptan(segment) ; st(0) <- 1; st(1) <- tan
2565 (:printer floating-point-no ((op #b10010)))
2567 (emit-byte segment #b11011001)
2568 (emit-byte segment #b11110010)))
2570 (define-instruction fpatan(segment) ; POPS STACK
2571 (:printer floating-point-no ((op #b10011)))
2573 (emit-byte segment #b11011001)
2574 (emit-byte segment #b11110011)))
2576 ;;;; loading constants
2578 (define-instruction fldz(segment)
2579 (:printer floating-point-no ((op #b01110)))
2581 (emit-byte segment #b11011001)
2582 (emit-byte segment #b11101110)))
2584 (define-instruction fld1(segment)
2585 (:printer floating-point-no ((op #b01000)))
2587 (emit-byte segment #b11011001)
2588 (emit-byte segment #b11101000)))
2590 (define-instruction fldpi(segment)
2591 (:printer floating-point-no ((op #b01011)))
2593 (emit-byte segment #b11011001)
2594 (emit-byte segment #b11101011)))
2596 (define-instruction fldl2t(segment)
2597 (:printer floating-point-no ((op #b01001)))
2599 (emit-byte segment #b11011001)
2600 (emit-byte segment #b11101001)))
2602 (define-instruction fldl2e(segment)
2603 (:printer floating-point-no ((op #b01010)))
2605 (emit-byte segment #b11011001)
2606 (emit-byte segment #b11101010)))
2608 (define-instruction fldlg2(segment)
2609 (:printer floating-point-no ((op #b01100)))
2611 (emit-byte segment #b11011001)
2612 (emit-byte segment #b11101100)))
2614 (define-instruction fldln2(segment)
2615 (:printer floating-point-no ((op #b01101)))
2617 (emit-byte segment #b11011001)
2618 (emit-byte segment #b11101101)))