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 (enter-format 32
592 :default-printer '(:name
594 (:unless (:constant 0)
596 (op :field (byte 8 0))
597 (disp :field (byte 16 8))
598 (level :field (byte 8 24)))
600 ;;; Single byte instruction with an immediate byte argument.
601 (sb!disassem:define-instruction-format (byte-imm 16
602 :default-printer '(:name :tab code))
603 (op :field (byte 8 0))
604 (code :field (byte 8 8)))
606 ;;;; primitive emitters
608 (define-bitfield-emitter emit-word 16
611 (define-bitfield-emitter emit-dword 32
614 (define-bitfield-emitter emit-byte-with-reg 8
615 (byte 5 3) (byte 3 0))
617 (define-bitfield-emitter emit-mod-reg-r/m-byte 8
618 (byte 2 6) (byte 3 3) (byte 3 0))
620 (define-bitfield-emitter emit-sib-byte 8
621 (byte 2 6) (byte 3 3) (byte 3 0))
625 (defun emit-absolute-fixup (segment fixup)
626 (note-fixup segment :absolute fixup)
627 (let ((offset (fixup-offset fixup)))
629 (emit-back-patch segment
630 4 ; FIXME: sb!vm:n-word-bytes
631 (lambda (segment posn)
632 (declare (ignore posn))
634 (- (+ (component-header-length)
635 (or (label-position offset)
637 other-pointer-lowtag))))
638 (emit-dword segment (or offset 0)))))
640 (defun emit-relative-fixup (segment fixup)
641 (note-fixup segment :relative fixup)
642 (emit-dword segment (or (fixup-offset fixup) 0)))
644 ;;;; the effective-address (ea) structure
646 (defun reg-tn-encoding (tn)
647 (declare (type tn tn))
648 (aver (eq (sb-name (sc-sb (tn-sc tn))) 'registers))
649 (let ((offset (tn-offset tn)))
650 (logior (ash (logand offset 1) 2)
653 (defstruct (ea (:constructor make-ea (size &key base index scale disp))
655 (size nil :type (member :byte :word :dword))
656 (base nil :type (or tn null))
657 (index nil :type (or tn null))
658 (scale 1 :type (member 1 2 4 8))
659 (disp 0 :type (or (signed-byte 32) fixup)))
660 (def!method print-object ((ea ea) stream)
661 (cond ((or *print-escape* *print-readably*)
662 (print-unreadable-object (ea stream :type t)
664 "~S~@[ base=~S~]~@[ index=~S~]~@[ scale=~S~]~@[ disp=~S~]"
668 (let ((scale (ea-scale ea)))
669 (if (= scale 1) nil scale))
672 (format stream "~A PTR [" (symbol-name (ea-size ea)))
674 (write-string (sb!c::location-print-name (ea-base ea)) stream)
676 (write-string "+" stream)))
678 (write-string (sb!c::location-print-name (ea-index ea)) stream))
679 (unless (= (ea-scale ea) 1)
680 (format stream "*~A" (ea-scale ea)))
681 (typecase (ea-disp ea)
684 (format stream "~@D" (ea-disp ea)))
686 (format stream "+~A" (ea-disp ea))))
687 (write-char #\] stream))))
689 (defun emit-ea (segment thing reg &optional allow-constants)
692 (ecase (sb-name (sc-sb (tn-sc thing)))
694 (emit-mod-reg-r/m-byte segment #b11 reg (reg-tn-encoding thing)))
696 ;; Convert stack tns into an index off of EBP.
697 (let ((disp (- (* (1+ (tn-offset thing)) n-word-bytes))))
698 (cond ((< -128 disp 127)
699 (emit-mod-reg-r/m-byte segment #b01 reg #b101)
700 (emit-byte segment disp))
702 (emit-mod-reg-r/m-byte segment #b10 reg #b101)
703 (emit-dword segment disp)))))
705 (unless allow-constants
707 "Constant TNs can only be directly used in MOV, PUSH, and CMP."))
708 (emit-mod-reg-r/m-byte segment #b00 reg #b101)
709 (emit-absolute-fixup segment
712 (- (* (tn-offset thing) n-word-bytes)
713 other-pointer-lowtag))))))
715 (let* ((base (ea-base thing))
716 (index (ea-index thing))
717 (scale (ea-scale thing))
718 (disp (ea-disp thing))
719 (mod (cond ((or (null base)
721 (not (= (reg-tn-encoding base) #b101))))
723 ((and (fixnump disp) (<= -128 disp 127))
727 (r/m (cond (index #b100)
729 (t (reg-tn-encoding base)))))
730 (emit-mod-reg-r/m-byte segment mod reg r/m)
732 (let ((ss (1- (integer-length scale)))
733 (index (if (null index)
735 (let ((index (reg-tn-encoding index)))
737 (error "can't index off of ESP")
739 (base (if (null base)
741 (reg-tn-encoding base))))
742 (emit-sib-byte segment ss index base)))
744 (emit-byte segment disp))
745 ((or (= mod #b10) (null base))
747 (emit-absolute-fixup segment disp)
748 (emit-dword segment disp))))))
750 (emit-mod-reg-r/m-byte segment #b00 reg #b101)
751 (emit-absolute-fixup segment thing))))
753 (defun fp-reg-tn-p (thing)
755 (eq (sb-name (sc-sb (tn-sc thing))) 'float-registers)))
757 ;;; like the above, but for fp-instructions--jrd
758 (defun emit-fp-op (segment thing op)
759 (if (fp-reg-tn-p thing)
760 (emit-byte segment (dpb op (byte 3 3) (dpb (tn-offset thing)
763 (emit-ea segment thing op)))
765 (defun byte-reg-p (thing)
767 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)
768 (member (sc-name (tn-sc thing)) *byte-sc-names*)
771 (defun byte-ea-p (thing)
773 (ea (eq (ea-size thing) :byte))
775 (and (member (sc-name (tn-sc thing)) *byte-sc-names*) t))
778 (defun word-reg-p (thing)
780 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)
781 (member (sc-name (tn-sc thing)) *word-sc-names*)
784 (defun word-ea-p (thing)
786 (ea (eq (ea-size thing) :word))
787 (tn (and (member (sc-name (tn-sc thing)) *word-sc-names*) t))
790 (defun dword-reg-p (thing)
792 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)
793 (member (sc-name (tn-sc thing)) *dword-sc-names*)
796 (defun dword-ea-p (thing)
798 (ea (eq (ea-size thing) :dword))
800 (and (member (sc-name (tn-sc thing)) *dword-sc-names*) t))
803 (defun register-p (thing)
805 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)))
807 (defun accumulator-p (thing)
808 (and (register-p thing)
809 (= (tn-offset thing) 0)))
813 (def!constant +operand-size-prefix-byte+ #b01100110)
815 (defun maybe-emit-operand-size-prefix (segment size)
816 (unless (or (eq size :byte) (eq size +default-operand-size+))
817 (emit-byte segment +operand-size-prefix-byte+)))
819 (defun operand-size (thing)
822 ;; FIXME: might as well be COND instead of having to use #. readmacro
823 ;; to hack up the code
824 (case (sc-name (tn-sc thing))
831 ;; added by jrd: float-registers is a separate size (?)
837 (error "can't tell the size of ~S ~S" thing (sc-name (tn-sc thing))))))
843 (defun matching-operand-size (dst src)
844 (let ((dst-size (operand-size dst))
845 (src-size (operand-size src)))
848 (if (eq dst-size src-size)
850 (error "size mismatch: ~S is a ~S and ~S is a ~S."
851 dst dst-size src src-size))
855 (error "can't tell the size of either ~S or ~S" dst src)))))
857 (defun emit-sized-immediate (segment size value)
860 (emit-byte segment value))
862 (emit-word segment value))
864 (emit-dword segment value))))
866 ;;;; general data transfer
868 (define-instruction mov (segment dst src)
869 ;; immediate to register
870 (:printer reg ((op #b1011) (imm nil :type 'imm-data))
871 '(:name :tab reg ", " imm))
872 ;; absolute mem to/from accumulator
873 (:printer simple-dir ((op #b101000) (imm nil :type 'imm-addr))
874 `(:name :tab ,(swap-if 'dir 'accum ", " '("[" imm "]"))))
875 ;; register to/from register/memory
876 (:printer reg-reg/mem-dir ((op #b100010)))
877 ;; immediate to register/memory
878 (:printer reg/mem-imm ((op '(#b1100011 #b000))))
881 (let ((size (matching-operand-size dst src)))
882 (maybe-emit-operand-size-prefix segment size)
883 (cond ((register-p dst)
884 (cond ((integerp src)
885 (emit-byte-with-reg segment
889 (reg-tn-encoding dst))
890 (emit-sized-immediate segment size src))
891 ((and (fixup-p src) (accumulator-p dst))
896 (emit-absolute-fixup segment src))
902 (emit-ea segment src (reg-tn-encoding dst) t))))
903 ((and (fixup-p dst) (accumulator-p src))
904 (emit-byte segment (if (eq size :byte) #b10100010 #b10100011))
905 (emit-absolute-fixup segment dst))
907 (emit-byte segment (if (eq size :byte) #b11000110 #b11000111))
908 (emit-ea segment dst #b000)
909 (emit-sized-immediate segment size src))
911 (emit-byte segment (if (eq size :byte) #b10001000 #b10001001))
912 (emit-ea segment dst (reg-tn-encoding src)))
914 (aver (eq size :dword))
915 (emit-byte segment #b11000111)
916 (emit-ea segment dst #b000)
917 (emit-absolute-fixup segment src))
919 (error "bogus arguments to MOV: ~S ~S" dst src))))))
921 (defun emit-move-with-extension (segment dst src opcode)
922 (aver (register-p dst))
923 (let ((dst-size (operand-size dst))
924 (src-size (operand-size src)))
927 (aver (eq src-size :byte))
928 (maybe-emit-operand-size-prefix segment :word)
929 (emit-byte segment #b00001111)
930 (emit-byte segment opcode)
931 (emit-ea segment src (reg-tn-encoding dst)))
935 (maybe-emit-operand-size-prefix segment :dword)
936 (emit-byte segment #b00001111)
937 (emit-byte segment opcode)
938 (emit-ea segment src (reg-tn-encoding dst)))
940 (emit-byte segment #b00001111)
941 (emit-byte segment (logior opcode 1))
942 (emit-ea segment src (reg-tn-encoding dst))))))))
944 (define-instruction movsx (segment dst src)
945 (:printer ext-reg-reg/mem ((op #b1011111) (reg nil :type 'word-reg)))
946 (:emitter (emit-move-with-extension segment dst src #b10111110)))
948 (define-instruction movzx (segment dst src)
949 (:printer ext-reg-reg/mem ((op #b1011011) (reg nil :type 'word-reg)))
950 (:emitter (emit-move-with-extension segment dst src #b10110110)))
952 (define-instruction push (segment src)
954 (:printer reg-no-width ((op #b01010)))
956 (:printer reg/mem ((op '(#b1111111 #b110)) (width 1)))
958 (:printer byte ((op #b01101010) (imm nil :type 'signed-imm-byte))
960 (:printer byte ((op #b01101000) (imm nil :type 'imm-word))
962 ;; ### segment registers?
965 (cond ((integerp src)
966 (cond ((<= -128 src 127)
967 (emit-byte segment #b01101010)
968 (emit-byte segment src))
970 (emit-byte segment #b01101000)
971 (emit-dword segment src))))
973 ;; Interpret the fixup as an immediate dword to push.
974 (emit-byte segment #b01101000)
975 (emit-absolute-fixup segment src))
977 (let ((size (operand-size src)))
978 (aver (not (eq size :byte)))
979 (maybe-emit-operand-size-prefix segment size)
980 (cond ((register-p src)
981 (emit-byte-with-reg segment #b01010 (reg-tn-encoding src)))
983 (emit-byte segment #b11111111)
984 (emit-ea segment src #b110 t))))))))
986 (define-instruction pusha (segment)
987 (:printer byte ((op #b01100000)))
989 (emit-byte segment #b01100000)))
991 (define-instruction pop (segment dst)
992 (:printer reg-no-width ((op #b01011)))
993 (:printer reg/mem ((op '(#b1000111 #b000)) (width 1)))
995 (let ((size (operand-size dst)))
996 (aver (not (eq size :byte)))
997 (maybe-emit-operand-size-prefix segment size)
998 (cond ((register-p dst)
999 (emit-byte-with-reg segment #b01011 (reg-tn-encoding dst)))
1001 (emit-byte segment #b10001111)
1002 (emit-ea segment dst #b000))))))
1004 (define-instruction popa (segment)
1005 (:printer byte ((op #b01100001)))
1007 (emit-byte segment #b01100001)))
1009 (define-instruction xchg (segment operand1 operand2)
1010 ;; Register with accumulator.
1011 (:printer reg-no-width ((op #b10010)) '(:name :tab accum ", " reg))
1012 ;; Register/Memory with Register.
1013 (:printer reg-reg/mem ((op #b1000011)))
1015 (let ((size (matching-operand-size operand1 operand2)))
1016 (maybe-emit-operand-size-prefix segment size)
1017 (labels ((xchg-acc-with-something (acc something)
1018 (if (and (not (eq size :byte)) (register-p something))
1019 (emit-byte-with-reg segment
1021 (reg-tn-encoding something))
1022 (xchg-reg-with-something acc something)))
1023 (xchg-reg-with-something (reg something)
1024 (emit-byte segment (if (eq size :byte) #b10000110 #b10000111))
1025 (emit-ea segment something (reg-tn-encoding reg))))
1026 (cond ((accumulator-p operand1)
1027 (xchg-acc-with-something operand1 operand2))
1028 ((accumulator-p operand2)
1029 (xchg-acc-with-something operand2 operand1))
1030 ((register-p operand1)
1031 (xchg-reg-with-something operand1 operand2))
1032 ((register-p operand2)
1033 (xchg-reg-with-something operand2 operand1))
1035 (error "bogus args to XCHG: ~S ~S" operand1 operand2)))))))
1037 (define-instruction lea (segment dst src)
1038 (:printer reg-reg/mem ((op #b1000110) (width 1)))
1040 (aver (dword-reg-p dst))
1041 (emit-byte segment #b10001101)
1042 (emit-ea segment src (reg-tn-encoding dst))))
1044 (define-instruction cmpxchg (segment dst src)
1045 ;; Register/Memory with Register.
1046 (:printer ext-reg-reg/mem ((op #b1011000)) '(:name :tab reg/mem ", " reg))
1048 (aver (register-p src))
1049 (let ((size (matching-operand-size src dst)))
1050 (maybe-emit-operand-size-prefix segment size)
1051 (emit-byte segment #b00001111)
1052 (emit-byte segment (if (eq size :byte) #b10110000 #b10110001))
1053 (emit-ea segment dst (reg-tn-encoding src)))))
1057 (define-instruction fs-segment-prefix (segment)
1059 (emit-byte segment #x64)))
1061 ;;;; flag control instructions
1063 ;;; CLC -- Clear Carry Flag.
1064 (define-instruction clc (segment)
1065 (:printer byte ((op #b11111000)))
1067 (emit-byte segment #b11111000)))
1069 ;;; CLD -- Clear Direction Flag.
1070 (define-instruction cld (segment)
1071 (:printer byte ((op #b11111100)))
1073 (emit-byte segment #b11111100)))
1075 ;;; CLI -- Clear Iterrupt Enable Flag.
1076 (define-instruction cli (segment)
1077 (:printer byte ((op #b11111010)))
1079 (emit-byte segment #b11111010)))
1081 ;;; CMC -- Complement Carry Flag.
1082 (define-instruction cmc (segment)
1083 (:printer byte ((op #b11110101)))
1085 (emit-byte segment #b11110101)))
1087 ;;; LAHF -- Load AH into flags.
1088 (define-instruction lahf (segment)
1089 (:printer byte ((op #b10011111)))
1091 (emit-byte segment #b10011111)))
1093 ;;; POPF -- Pop flags.
1094 (define-instruction popf (segment)
1095 (:printer byte ((op #b10011101)))
1097 (emit-byte segment #b10011101)))
1099 ;;; PUSHF -- push flags.
1100 (define-instruction pushf (segment)
1101 (:printer byte ((op #b10011100)))
1103 (emit-byte segment #b10011100)))
1105 ;;; SAHF -- Store AH into flags.
1106 (define-instruction sahf (segment)
1107 (:printer byte ((op #b10011110)))
1109 (emit-byte segment #b10011110)))
1111 ;;; STC -- Set Carry Flag.
1112 (define-instruction stc (segment)
1113 (:printer byte ((op #b11111001)))
1115 (emit-byte segment #b11111001)))
1117 ;;; STD -- Set Direction Flag.
1118 (define-instruction std (segment)
1119 (:printer byte ((op #b11111101)))
1121 (emit-byte segment #b11111101)))
1123 ;;; STI -- Set Interrupt Enable Flag.
1124 (define-instruction sti (segment)
1125 (:printer byte ((op #b11111011)))
1127 (emit-byte segment #b11111011)))
1131 (defun emit-random-arith-inst (name segment dst src opcode
1132 &optional allow-constants)
1133 (let ((size (matching-operand-size dst src)))
1134 (maybe-emit-operand-size-prefix segment size)
1137 (cond ((and (not (eq size :byte)) (<= -128 src 127))
1138 (emit-byte segment #b10000011)
1139 (emit-ea segment dst opcode allow-constants)
1140 (emit-byte segment src))
1141 ((accumulator-p dst)
1148 (emit-sized-immediate segment size src))
1150 (emit-byte segment (if (eq size :byte) #b10000000 #b10000001))
1151 (emit-ea segment dst opcode allow-constants)
1152 (emit-sized-immediate segment size src))))
1157 (if (eq size :byte) #b00000000 #b00000001)))
1158 (emit-ea segment dst (reg-tn-encoding src) allow-constants))
1163 (if (eq size :byte) #b00000010 #b00000011)))
1164 (emit-ea segment src (reg-tn-encoding dst) allow-constants))
1166 (error "bogus operands to ~A" name)))))
1168 (eval-when (:compile-toplevel :execute)
1169 (defun arith-inst-printer-list (subop)
1170 `((accum-imm ((op ,(dpb subop (byte 3 2) #b0000010))))
1171 (reg/mem-imm ((op (#b1000000 ,subop))))
1172 (reg/mem-imm ((op (#b1000001 ,subop))
1173 (imm nil :type signed-imm-byte)))
1174 (reg-reg/mem-dir ((op ,(dpb subop (byte 3 1) #b000000))))))
1177 (define-instruction add (segment dst src)
1178 (:printer-list (arith-inst-printer-list #b000))
1179 (:emitter (emit-random-arith-inst "ADD" segment dst src #b000)))
1181 (define-instruction adc (segment dst src)
1182 (:printer-list (arith-inst-printer-list #b010))
1183 (:emitter (emit-random-arith-inst "ADC" segment dst src #b010)))
1185 (define-instruction sub (segment dst src)
1186 (:printer-list (arith-inst-printer-list #b101))
1187 (:emitter (emit-random-arith-inst "SUB" segment dst src #b101)))
1189 (define-instruction sbb (segment dst src)
1190 (:printer-list (arith-inst-printer-list #b011))
1191 (:emitter (emit-random-arith-inst "SBB" segment dst src #b011)))
1193 (define-instruction cmp (segment dst src)
1194 (:printer-list (arith-inst-printer-list #b111))
1195 (:emitter (emit-random-arith-inst "CMP" segment dst src #b111 t)))
1197 (define-instruction inc (segment dst)
1199 (:printer reg-no-width ((op #b01000)))
1201 (:printer reg/mem ((op '(#b1111111 #b000))))
1203 (let ((size (operand-size dst)))
1204 (maybe-emit-operand-size-prefix segment size)
1205 (cond ((and (not (eq size :byte)) (register-p dst))
1206 (emit-byte-with-reg segment #b01000 (reg-tn-encoding dst)))
1208 (emit-byte segment (if (eq size :byte) #b11111110 #b11111111))
1209 (emit-ea segment dst #b000))))))
1211 (define-instruction dec (segment dst)
1213 (:printer reg-no-width ((op #b01001)))
1215 (:printer reg/mem ((op '(#b1111111 #b001))))
1217 (let ((size (operand-size dst)))
1218 (maybe-emit-operand-size-prefix segment size)
1219 (cond ((and (not (eq size :byte)) (register-p dst))
1220 (emit-byte-with-reg segment #b01001 (reg-tn-encoding dst)))
1222 (emit-byte segment (if (eq size :byte) #b11111110 #b11111111))
1223 (emit-ea segment dst #b001))))))
1225 (define-instruction neg (segment dst)
1226 (:printer reg/mem ((op '(#b1111011 #b011))))
1228 (let ((size (operand-size dst)))
1229 (maybe-emit-operand-size-prefix segment size)
1230 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1231 (emit-ea segment dst #b011))))
1233 (define-instruction aaa (segment)
1234 (:printer byte ((op #b00110111)))
1236 (emit-byte segment #b00110111)))
1238 (define-instruction aas (segment)
1239 (:printer byte ((op #b00111111)))
1241 (emit-byte segment #b00111111)))
1243 (define-instruction daa (segment)
1244 (:printer byte ((op #b00100111)))
1246 (emit-byte segment #b00100111)))
1248 (define-instruction das (segment)
1249 (:printer byte ((op #b00101111)))
1251 (emit-byte segment #b00101111)))
1253 (define-instruction mul (segment dst src)
1254 (:printer accum-reg/mem ((op '(#b1111011 #b100))))
1256 (let ((size (matching-operand-size dst src)))
1257 (aver (accumulator-p dst))
1258 (maybe-emit-operand-size-prefix segment size)
1259 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1260 (emit-ea segment src #b100))))
1262 (define-instruction imul (segment dst &optional src1 src2)
1263 (:printer accum-reg/mem ((op '(#b1111011 #b101))))
1264 (:printer ext-reg-reg/mem ((op #b1010111)))
1265 (:printer reg-reg/mem ((op #b0110100) (width 1) (imm nil :type 'imm-word))
1266 '(:name :tab reg ", " reg/mem ", " imm))
1267 (:printer reg-reg/mem ((op #b0110101) (width 1)
1268 (imm nil :type 'signed-imm-byte))
1269 '(:name :tab reg ", " reg/mem ", " imm))
1271 (flet ((r/m-with-immed-to-reg (reg r/m immed)
1272 (let* ((size (matching-operand-size reg r/m))
1273 (sx (and (not (eq size :byte)) (<= -128 immed 127))))
1274 (maybe-emit-operand-size-prefix segment size)
1275 (emit-byte segment (if sx #b01101011 #b01101001))
1276 (emit-ea segment r/m (reg-tn-encoding reg))
1278 (emit-byte segment immed)
1279 (emit-sized-immediate segment size immed)))))
1281 (r/m-with-immed-to-reg dst src1 src2))
1284 (r/m-with-immed-to-reg dst dst src1)
1285 (let ((size (matching-operand-size dst src1)))
1286 (maybe-emit-operand-size-prefix segment size)
1287 (emit-byte segment #b00001111)
1288 (emit-byte segment #b10101111)
1289 (emit-ea segment src1 (reg-tn-encoding dst)))))
1291 (let ((size (operand-size dst)))
1292 (maybe-emit-operand-size-prefix segment size)
1293 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1294 (emit-ea segment dst #b101)))))))
1296 (define-instruction div (segment dst src)
1297 (:printer accum-reg/mem ((op '(#b1111011 #b110))))
1299 (let ((size (matching-operand-size dst src)))
1300 (aver (accumulator-p dst))
1301 (maybe-emit-operand-size-prefix segment size)
1302 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1303 (emit-ea segment src #b110))))
1305 (define-instruction idiv (segment dst src)
1306 (:printer accum-reg/mem ((op '(#b1111011 #b111))))
1308 (let ((size (matching-operand-size dst src)))
1309 (aver (accumulator-p dst))
1310 (maybe-emit-operand-size-prefix segment size)
1311 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1312 (emit-ea segment src #b111))))
1314 (define-instruction aad (segment)
1315 (:printer two-bytes ((op '(#b11010101 #b00001010))))
1317 (emit-byte segment #b11010101)
1318 (emit-byte segment #b00001010)))
1320 (define-instruction aam (segment)
1321 (:printer two-bytes ((op '(#b11010100 #b00001010))))
1323 (emit-byte segment #b11010100)
1324 (emit-byte segment #b00001010)))
1326 ;;; CBW -- Convert Byte to Word. AX <- sign_xtnd(AL)
1327 (define-instruction cbw (segment)
1329 (maybe-emit-operand-size-prefix segment :word)
1330 (emit-byte segment #b10011000)))
1332 ;;; CWDE -- Convert Word To Double Word Extened. EAX <- sign_xtnd(AX)
1333 (define-instruction cwde (segment)
1335 (maybe-emit-operand-size-prefix segment :dword)
1336 (emit-byte segment #b10011000)))
1338 ;;; CWD -- Convert Word to Double Word. DX:AX <- sign_xtnd(AX)
1339 (define-instruction cwd (segment)
1341 (maybe-emit-operand-size-prefix segment :word)
1342 (emit-byte segment #b10011001)))
1344 ;;; CDQ -- Convert Double Word to Quad Word. EDX:EAX <- sign_xtnd(EAX)
1345 (define-instruction cdq (segment)
1346 (:printer byte ((op #b10011001)))
1348 (maybe-emit-operand-size-prefix segment :dword)
1349 (emit-byte segment #b10011001)))
1351 (define-instruction xadd (segment dst src)
1352 ;; Register/Memory with Register.
1353 (:printer ext-reg-reg/mem ((op #b1100000)) '(:name :tab reg/mem ", " reg))
1355 (aver (register-p src))
1356 (let ((size (matching-operand-size src dst)))
1357 (maybe-emit-operand-size-prefix segment size)
1358 (emit-byte segment #b00001111)
1359 (emit-byte segment (if (eq size :byte) #b11000000 #b11000001))
1360 (emit-ea segment dst (reg-tn-encoding src)))))
1365 (defun emit-shift-inst (segment dst amount opcode)
1366 (let ((size (operand-size dst)))
1367 (maybe-emit-operand-size-prefix segment size)
1368 (multiple-value-bind (major-opcode immed)
1370 (:cl (values #b11010010 nil))
1371 (1 (values #b11010000 nil))
1372 (t (values #b11000000 t)))
1374 (if (eq size :byte) major-opcode (logior major-opcode 1)))
1375 (emit-ea segment dst opcode)
1377 (emit-byte segment amount)))))
1379 (eval-when (:compile-toplevel :execute)
1380 (defun shift-inst-printer-list (subop)
1381 `((reg/mem ((op (#b1101000 ,subop)))
1382 (:name :tab reg/mem ", 1"))
1383 (reg/mem ((op (#b1101001 ,subop)))
1384 (:name :tab reg/mem ", " 'cl))
1385 (reg/mem-imm ((op (#b1100000 ,subop))
1386 (imm nil :type signed-imm-byte))))))
1388 (define-instruction rol (segment dst amount)
1390 (shift-inst-printer-list #b000))
1392 (emit-shift-inst segment dst amount #b000)))
1394 (define-instruction ror (segment dst amount)
1396 (shift-inst-printer-list #b001))
1398 (emit-shift-inst segment dst amount #b001)))
1400 (define-instruction rcl (segment dst amount)
1402 (shift-inst-printer-list #b010))
1404 (emit-shift-inst segment dst amount #b010)))
1406 (define-instruction rcr (segment dst amount)
1408 (shift-inst-printer-list #b011))
1410 (emit-shift-inst segment dst amount #b011)))
1412 (define-instruction shl (segment dst amount)
1414 (shift-inst-printer-list #b100))
1416 (emit-shift-inst segment dst amount #b100)))
1418 (define-instruction shr (segment dst amount)
1420 (shift-inst-printer-list #b101))
1422 (emit-shift-inst segment dst amount #b101)))
1424 (define-instruction sar (segment dst amount)
1426 (shift-inst-printer-list #b111))
1428 (emit-shift-inst segment dst amount #b111)))
1430 (defun emit-double-shift (segment opcode dst src amt)
1431 (let ((size (matching-operand-size dst src)))
1432 (when (eq size :byte)
1433 (error "Double shifts can only be used with words."))
1434 (maybe-emit-operand-size-prefix segment size)
1435 (emit-byte segment #b00001111)
1436 (emit-byte segment (dpb opcode (byte 1 3)
1437 (if (eq amt :cl) #b10100101 #b10100100)))
1439 (emit-ea segment dst src)
1440 (emit-ea segment dst (reg-tn-encoding src)) ; pw tries this
1441 (unless (eq amt :cl)
1442 (emit-byte segment amt))))
1444 (eval-when (:compile-toplevel :execute)
1445 (defun double-shift-inst-printer-list (op)
1447 (ext-reg-reg/mem-imm ((op ,(logior op #b100))
1448 (imm nil :type signed-imm-byte)))
1449 (ext-reg-reg/mem ((op ,(logior op #b101)))
1450 (:name :tab reg/mem ", " 'cl)))))
1452 (define-instruction shld (segment dst src amt)
1453 (:declare (type (or (member :cl) (mod 32)) amt))
1454 (:printer-list (double-shift-inst-printer-list #b10100000))
1456 (emit-double-shift segment #b0 dst src amt)))
1458 (define-instruction shrd (segment dst src amt)
1459 (:declare (type (or (member :cl) (mod 32)) amt))
1460 (:printer-list (double-shift-inst-printer-list #b10101000))
1462 (emit-double-shift segment #b1 dst src amt)))
1464 (define-instruction and (segment dst src)
1466 (arith-inst-printer-list #b100))
1468 (emit-random-arith-inst "AND" segment dst src #b100)))
1470 (define-instruction test (segment this that)
1471 (:printer accum-imm ((op #b1010100)))
1472 (:printer reg/mem-imm ((op '(#b1111011 #b000))))
1473 (:printer reg-reg/mem ((op #b1000010)))
1475 (let ((size (matching-operand-size this that)))
1476 (maybe-emit-operand-size-prefix segment size)
1477 (flet ((test-immed-and-something (immed something)
1478 (cond ((accumulator-p something)
1480 (if (eq size :byte) #b10101000 #b10101001))
1481 (emit-sized-immediate segment size immed))
1484 (if (eq size :byte) #b11110110 #b11110111))
1485 (emit-ea segment something #b000)
1486 (emit-sized-immediate segment size immed))))
1487 (test-reg-and-something (reg something)
1488 (emit-byte segment (if (eq size :byte) #b10000100 #b10000101))
1489 (emit-ea segment something (reg-tn-encoding reg))))
1490 (cond ((integerp that)
1491 (test-immed-and-something that this))
1493 (test-immed-and-something this that))
1495 (test-reg-and-something this that))
1497 (test-reg-and-something that this))
1499 (error "bogus operands for TEST: ~S and ~S" this that)))))))
1501 (define-instruction or (segment dst src)
1503 (arith-inst-printer-list #b001))
1505 (emit-random-arith-inst "OR" segment dst src #b001)))
1507 (define-instruction xor (segment dst src)
1509 (arith-inst-printer-list #b110))
1511 (emit-random-arith-inst "XOR" segment dst src #b110)))
1513 (define-instruction not (segment dst)
1514 (:printer reg/mem ((op '(#b1111011 #b010))))
1516 (let ((size (operand-size dst)))
1517 (maybe-emit-operand-size-prefix segment size)
1518 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1519 (emit-ea segment dst #b010))))
1521 ;;;; string manipulation
1523 (define-instruction cmps (segment size)
1524 (:printer string-op ((op #b1010011)))
1526 (maybe-emit-operand-size-prefix segment size)
1527 (emit-byte segment (if (eq size :byte) #b10100110 #b10100111))))
1529 (define-instruction ins (segment acc)
1530 (:printer string-op ((op #b0110110)))
1532 (let ((size (operand-size acc)))
1533 (aver (accumulator-p acc))
1534 (maybe-emit-operand-size-prefix segment size)
1535 (emit-byte segment (if (eq size :byte) #b01101100 #b01101101)))))
1537 (define-instruction lods (segment acc)
1538 (:printer string-op ((op #b1010110)))
1540 (let ((size (operand-size acc)))
1541 (aver (accumulator-p acc))
1542 (maybe-emit-operand-size-prefix segment size)
1543 (emit-byte segment (if (eq size :byte) #b10101100 #b10101101)))))
1545 (define-instruction movs (segment size)
1546 (:printer string-op ((op #b1010010)))
1548 (maybe-emit-operand-size-prefix segment size)
1549 (emit-byte segment (if (eq size :byte) #b10100100 #b10100101))))
1551 (define-instruction outs (segment acc)
1552 (:printer string-op ((op #b0110111)))
1554 (let ((size (operand-size acc)))
1555 (aver (accumulator-p acc))
1556 (maybe-emit-operand-size-prefix segment size)
1557 (emit-byte segment (if (eq size :byte) #b01101110 #b01101111)))))
1559 (define-instruction scas (segment acc)
1560 (:printer string-op ((op #b1010111)))
1562 (let ((size (operand-size acc)))
1563 (aver (accumulator-p acc))
1564 (maybe-emit-operand-size-prefix segment size)
1565 (emit-byte segment (if (eq size :byte) #b10101110 #b10101111)))))
1567 (define-instruction stos (segment acc)
1568 (:printer string-op ((op #b1010101)))
1570 (let ((size (operand-size acc)))
1571 (aver (accumulator-p acc))
1572 (maybe-emit-operand-size-prefix segment size)
1573 (emit-byte segment (if (eq size :byte) #b10101010 #b10101011)))))
1575 (define-instruction xlat (segment)
1576 (:printer byte ((op #b11010111)))
1578 (emit-byte segment #b11010111)))
1580 (define-instruction rep (segment)
1582 (emit-byte segment #b11110010)))
1584 (define-instruction repe (segment)
1585 (:printer byte ((op #b11110011)))
1587 (emit-byte segment #b11110011)))
1589 (define-instruction repne (segment)
1590 (:printer byte ((op #b11110010)))
1592 (emit-byte segment #b11110010)))
1595 ;;;; bit manipulation
1597 (define-instruction bsf (segment dst src)
1598 (:printer ext-reg-reg/mem ((op #b1011110) (width 0)))
1600 (let ((size (matching-operand-size dst src)))
1601 (when (eq size :byte)
1602 (error "can't scan bytes: ~S" src))
1603 (maybe-emit-operand-size-prefix segment size)
1604 (emit-byte segment #b00001111)
1605 (emit-byte segment #b10111100)
1606 (emit-ea segment src (reg-tn-encoding dst)))))
1608 (define-instruction bsr (segment dst src)
1609 (:printer ext-reg-reg/mem ((op #b1011110) (width 1)))
1611 (let ((size (matching-operand-size dst src)))
1612 (when (eq size :byte)
1613 (error "can't scan bytes: ~S" src))
1614 (maybe-emit-operand-size-prefix segment size)
1615 (emit-byte segment #b00001111)
1616 (emit-byte segment #b10111101)
1617 (emit-ea segment src (reg-tn-encoding dst)))))
1619 (defun emit-bit-test-and-mumble (segment src index opcode)
1620 (let ((size (operand-size src)))
1621 (when (eq size :byte)
1622 (error "can't scan bytes: ~S" src))
1623 (maybe-emit-operand-size-prefix segment size)
1624 (emit-byte segment #b00001111)
1625 (cond ((integerp index)
1626 (emit-byte segment #b10111010)
1627 (emit-ea segment src opcode)
1628 (emit-byte segment index))
1630 (emit-byte segment (dpb opcode (byte 3 3) #b10000011))
1631 (emit-ea segment src (reg-tn-encoding index))))))
1633 (eval-when (:compile-toplevel :execute)
1634 (defun bit-test-inst-printer-list (subop)
1635 `((ext-reg/mem-imm ((op (#b1011101 ,subop))
1636 (reg/mem nil :type word-reg/mem)
1637 (imm nil :type imm-data)
1639 (ext-reg-reg/mem ((op ,(dpb subop (byte 3 2) #b1000001))
1641 (:name :tab reg/mem ", " reg)))))
1643 (define-instruction bt (segment src index)
1644 (:printer-list (bit-test-inst-printer-list #b100))
1646 (emit-bit-test-and-mumble segment src index #b100)))
1648 (define-instruction btc (segment src index)
1649 (:printer-list (bit-test-inst-printer-list #b111))
1651 (emit-bit-test-and-mumble segment src index #b111)))
1653 (define-instruction btr (segment src index)
1654 (:printer-list (bit-test-inst-printer-list #b110))
1656 (emit-bit-test-and-mumble segment src index #b110)))
1658 (define-instruction bts (segment src index)
1659 (:printer-list (bit-test-inst-printer-list #b101))
1661 (emit-bit-test-and-mumble segment src index #b101)))
1664 ;;;; control transfer
1666 (define-instruction call (segment where)
1667 (:printer near-jump ((op #b11101000)))
1668 (:printer reg/mem ((op '(#b1111111 #b010)) (width 1)))
1672 (emit-byte segment #b11101000)
1673 (emit-back-patch segment
1675 (lambda (segment posn)
1677 (- (label-position where)
1680 (emit-byte segment #b11101000)
1681 (emit-relative-fixup segment where))
1683 (emit-byte segment #b11111111)
1684 (emit-ea segment where #b010)))))
1686 (defun emit-byte-displacement-backpatch (segment target)
1687 (emit-back-patch segment
1689 (lambda (segment posn)
1690 (let ((disp (- (label-position target) (1+ posn))))
1691 (aver (<= -128 disp 127))
1692 (emit-byte segment disp)))))
1694 (define-instruction jmp (segment cond &optional where)
1695 ;; conditional jumps
1696 (:printer short-cond-jump ((op #b0111)) '('j cc :tab label))
1697 (:printer near-cond-jump () '('j cc :tab label))
1698 ;; unconditional jumps
1699 (:printer short-jump ((op #b1011)))
1700 (:printer near-jump ((op #b11101001)) )
1701 (:printer reg/mem ((op '(#b1111111 #b100)) (width 1)))
1706 (lambda (segment posn delta-if-after)
1707 (let ((disp (- (label-position where posn delta-if-after)
1709 (when (<= -128 disp 127)
1711 (dpb (conditional-opcode cond)
1714 (emit-byte-displacement-backpatch segment where)
1716 (lambda (segment posn)
1717 (let ((disp (- (label-position where) (+ posn 6))))
1718 (emit-byte segment #b00001111)
1720 (dpb (conditional-opcode cond)
1723 (emit-dword segment disp)))))
1724 ((label-p (setq where cond))
1727 (lambda (segment posn delta-if-after)
1728 (let ((disp (- (label-position where posn delta-if-after)
1730 (when (<= -128 disp 127)
1731 (emit-byte segment #b11101011)
1732 (emit-byte-displacement-backpatch segment where)
1734 (lambda (segment posn)
1735 (let ((disp (- (label-position where) (+ posn 5))))
1736 (emit-byte segment #b11101001)
1737 (emit-dword segment disp)))))
1739 (emit-byte segment #b11101001)
1740 (emit-relative-fixup segment where))
1742 (unless (or (ea-p where) (tn-p where))
1743 (error "don't know what to do with ~A" where))
1744 (emit-byte segment #b11111111)
1745 (emit-ea segment where #b100)))))
1747 (define-instruction jmp-short (segment label)
1749 (emit-byte segment #b11101011)
1750 (emit-byte-displacement-backpatch segment label)))
1752 (define-instruction ret (segment &optional stack-delta)
1753 (:printer byte ((op #b11000011)))
1754 (:printer byte ((op #b11000010) (imm nil :type 'imm-word-16))
1758 (emit-byte segment #b11000010)
1759 (emit-word segment stack-delta))
1761 (emit-byte segment #b11000011)))))
1763 (define-instruction jecxz (segment target)
1764 (:printer short-jump ((op #b0011)))
1766 (emit-byte segment #b11100011)
1767 (emit-byte-displacement-backpatch segment target)))
1769 (define-instruction loop (segment target)
1770 (:printer short-jump ((op #b0010)))
1772 (emit-byte segment #b11100010) ; pfw this was 11100011, or jecxz!!!!
1773 (emit-byte-displacement-backpatch segment target)))
1775 (define-instruction loopz (segment target)
1776 (:printer short-jump ((op #b0001)))
1778 (emit-byte segment #b11100001)
1779 (emit-byte-displacement-backpatch segment target)))
1781 (define-instruction loopnz (segment target)
1782 (:printer short-jump ((op #b0000)))
1784 (emit-byte segment #b11100000)
1785 (emit-byte-displacement-backpatch segment target)))
1787 ;;;; conditional byte set
1789 (define-instruction set (segment dst cond)
1790 (:printer cond-set ())
1792 (emit-byte segment #b00001111)
1793 (emit-byte segment (dpb (conditional-opcode cond) (byte 4 0) #b10010000))
1794 (emit-ea segment dst #b000)))
1798 (define-instruction enter (segment disp &optional (level 0))
1799 (:declare (type (unsigned-byte 16) disp)
1800 (type (unsigned-byte 8) level))
1801 (:printer enter-format ((op #b11001000)))
1803 (emit-byte segment #b11001000)
1804 (emit-word segment disp)
1805 (emit-byte segment level)))
1807 (define-instruction leave (segment)
1808 (:printer byte ((op #b11001001)))
1810 (emit-byte segment #b11001001)))
1812 ;;;; interrupt instructions
1814 (defun snarf-error-junk (sap offset &optional length-only)
1815 (let* ((length (sb!sys:sap-ref-8 sap offset))
1816 (vector (make-array length :element-type '(unsigned-byte 8))))
1817 (declare (type sb!sys:system-area-pointer sap)
1818 (type (unsigned-byte 8) length)
1819 (type (simple-array (unsigned-byte 8) (*)) vector))
1821 (values 0 (1+ length) nil nil))
1823 (sb!kernel:copy-from-system-area sap (* n-byte-bits (1+ offset))
1824 vector (* n-word-bits
1826 (* length n-byte-bits))
1827 (collect ((sc-offsets)
1829 (lengths 1) ; the length byte
1831 (error-number (sb!c:read-var-integer vector index)))
1834 (when (>= index length)
1836 (let ((old-index index))
1837 (sc-offsets (sb!c:read-var-integer vector index))
1838 (lengths (- index old-index))))
1839 (values error-number
1845 (defmacro break-cases (breaknum &body cases)
1846 (let ((bn-temp (gensym)))
1847 (collect ((clauses))
1848 (dolist (case cases)
1849 (clauses `((= ,bn-temp ,(car case)) ,@(cdr case))))
1850 `(let ((,bn-temp ,breaknum))
1851 (cond ,@(clauses))))))
1854 (defun break-control (chunk inst stream dstate)
1855 (declare (ignore inst))
1856 (flet ((nt (x) (if stream (sb!disassem:note x dstate))))
1857 ;; FIXME: Make sure that BYTE-IMM-CODE is defined. The genesis
1858 ;; map has it undefined; and it should be easier to look in the target
1859 ;; Lisp (with (DESCRIBE 'BYTE-IMM-CODE)) than to definitively deduce
1860 ;; from first principles whether it's defined in some way that genesis
1862 (case (byte-imm-code chunk dstate)
1865 (sb!disassem:handle-break-args #'snarf-error-junk stream dstate))
1868 (sb!disassem:handle-break-args #'snarf-error-junk stream dstate))
1870 (nt "breakpoint trap"))
1871 (#.pending-interrupt-trap
1872 (nt "pending interrupt trap"))
1875 (#.fun-end-breakpoint-trap
1876 (nt "function end breakpoint trap")))))
1878 (define-instruction break (segment code)
1879 (:declare (type (unsigned-byte 8) code))
1880 (:printer byte-imm ((op #b11001100)) '(:name :tab code)
1881 :control #'break-control)
1883 (emit-byte segment #b11001100)
1884 (emit-byte segment code)))
1886 (define-instruction int (segment number)
1887 (:declare (type (unsigned-byte 8) number))
1888 (:printer byte-imm ((op #b11001101)))
1892 (emit-byte segment #b11001100))
1894 (emit-byte segment #b11001101)
1895 (emit-byte segment number)))))
1897 (define-instruction into (segment)
1898 (:printer byte ((op #b11001110)))
1900 (emit-byte segment #b11001110)))
1902 (define-instruction bound (segment reg bounds)
1904 (let ((size (matching-operand-size reg bounds)))
1905 (when (eq size :byte)
1906 (error "can't bounds-test bytes: ~S" reg))
1907 (maybe-emit-operand-size-prefix segment size)
1908 (emit-byte segment #b01100010)
1909 (emit-ea segment bounds (reg-tn-encoding reg)))))
1911 (define-instruction iret (segment)
1912 (:printer byte ((op #b11001111)))
1914 (emit-byte segment #b11001111)))
1916 ;;;; processor control
1918 (define-instruction hlt (segment)
1919 (:printer byte ((op #b11110100)))
1921 (emit-byte segment #b11110100)))
1923 (define-instruction nop (segment)
1924 (:printer byte ((op #b10010000)))
1926 (emit-byte segment #b10010000)))
1928 (define-instruction wait (segment)
1929 (:printer byte ((op #b10011011)))
1931 (emit-byte segment #b10011011)))
1933 (define-instruction lock (segment)
1934 (:printer byte ((op #b11110000)))
1936 (emit-byte segment #b11110000)))
1938 ;;;; miscellaneous hackery
1940 (define-instruction byte (segment byte)
1942 (emit-byte segment byte)))
1944 (define-instruction word (segment word)
1946 (emit-word segment word)))
1948 (define-instruction dword (segment dword)
1950 (emit-dword segment dword)))
1952 (defun emit-header-data (segment type)
1953 (emit-back-patch segment
1955 (lambda (segment posn)
1959 (component-header-length))
1963 (define-instruction simple-fun-header-word (segment)
1965 (emit-header-data segment simple-fun-header-widetag)))
1967 (define-instruction lra-header-word (segment)
1969 (emit-header-data segment return-pc-header-widetag)))
1971 ;;;; fp instructions
1973 ;;;; FIXME: This section said "added by jrd", which should end up in CREDITS.
1975 ;;;; Note: We treat the single-precision and double-precision variants
1976 ;;;; as separate instructions.
1978 ;;; Load single to st(0).
1979 (define-instruction fld (segment source)
1980 (:printer floating-point ((op '(#b001 #b000))))
1982 (emit-byte segment #b11011001)
1983 (emit-fp-op segment source #b000)))
1985 ;;; Load double to st(0).
1986 (define-instruction fldd (segment source)
1987 (:printer floating-point ((op '(#b101 #b000))))
1988 (:printer floating-point-fp ((op '(#b001 #b000))))
1990 (if (fp-reg-tn-p source)
1991 (emit-byte segment #b11011001)
1992 (emit-byte segment #b11011101))
1993 (emit-fp-op segment source #b000)))
1995 ;;; Load long to st(0).
1996 (define-instruction fldl (segment source)
1997 (:printer floating-point ((op '(#b011 #b101))))
1999 (emit-byte segment #b11011011)
2000 (emit-fp-op segment source #b101)))
2002 ;;; Store single from st(0).
2003 (define-instruction fst (segment dest)
2004 (:printer floating-point ((op '(#b001 #b010))))
2006 (cond ((fp-reg-tn-p dest)
2007 (emit-byte segment #b11011101)
2008 (emit-fp-op segment dest #b010))
2010 (emit-byte segment #b11011001)
2011 (emit-fp-op segment dest #b010)))))
2013 ;;; Store double from st(0).
2014 (define-instruction fstd (segment dest)
2015 (:printer floating-point ((op '(#b101 #b010))))
2016 (:printer floating-point-fp ((op '(#b101 #b010))))
2018 (cond ((fp-reg-tn-p dest)
2019 (emit-byte segment #b11011101)
2020 (emit-fp-op segment dest #b010))
2022 (emit-byte segment #b11011101)
2023 (emit-fp-op segment dest #b010)))))
2025 ;;; Arithmetic ops are all done with at least one operand at top of
2026 ;;; stack. The other operand is is another register or a 32/64 bit
2029 ;;; dtc: I've tried to follow the Intel ASM386 conventions, but note
2030 ;;; that these conflict with the Gdb conventions for binops. To reduce
2031 ;;; the confusion I've added comments showing the mathamatical
2032 ;;; operation and the two syntaxes. By the ASM386 convention the
2033 ;;; instruction syntax is:
2036 ;;; or Fop Destination, Source
2038 ;;; If only one operand is given then it is the source and the
2039 ;;; destination is ST(0). There are reversed forms of the fsub and
2040 ;;; fdiv instructions inducated by an 'R' suffix.
2042 ;;; The mathematical operation for the non-reverse form is always:
2043 ;;; destination = destination op source
2045 ;;; For the reversed form it is:
2046 ;;; destination = source op destination
2048 ;;; The instructions below only accept one operand at present which is
2049 ;;; usually the source. I've hack in extra instructions to implement
2050 ;;; the fops with a ST(i) destination, these have a -sti suffix and
2051 ;;; the operand is the destination with the source being ST(0).
2054 ;;; st(0) = st(0) + memory or st(i).
2055 (define-instruction fadd (segment source)
2056 (:printer floating-point ((op '(#b000 #b000))))
2058 (emit-byte segment #b11011000)
2059 (emit-fp-op segment source #b000)))
2062 ;;; st(0) = st(0) + memory or st(i).
2063 (define-instruction faddd (segment source)
2064 (:printer floating-point ((op '(#b100 #b000))))
2065 (:printer floating-point-fp ((op '(#b000 #b000))))
2067 (if (fp-reg-tn-p source)
2068 (emit-byte segment #b11011000)
2069 (emit-byte segment #b11011100))
2070 (emit-fp-op segment source #b000)))
2072 ;;; Add double destination st(i):
2073 ;;; st(i) = st(0) + st(i).
2074 (define-instruction fadd-sti (segment destination)
2075 (:printer floating-point-fp ((op '(#b100 #b000))))
2077 (aver (fp-reg-tn-p destination))
2078 (emit-byte segment #b11011100)
2079 (emit-fp-op segment destination #b000)))
2081 (define-instruction faddp-sti (segment destination)
2082 (:printer floating-point-fp ((op '(#b110 #b000))))
2084 (aver (fp-reg-tn-p destination))
2085 (emit-byte segment #b11011110)
2086 (emit-fp-op segment destination #b000)))
2088 ;;; Subtract single:
2089 ;;; st(0) = st(0) - memory or st(i).
2090 (define-instruction fsub (segment source)
2091 (:printer floating-point ((op '(#b000 #b100))))
2093 (emit-byte segment #b11011000)
2094 (emit-fp-op segment source #b100)))
2096 ;;; Subtract single, reverse:
2097 ;;; st(0) = memory or st(i) - st(0).
2098 (define-instruction fsubr (segment source)
2099 (:printer floating-point ((op '(#b000 #b101))))
2101 (emit-byte segment #b11011000)
2102 (emit-fp-op segment source #b101)))
2104 ;;; Subtract double:
2105 ;;; st(0) = st(0) - memory or st(i).
2106 (define-instruction fsubd (segment source)
2107 (:printer floating-point ((op '(#b100 #b100))))
2108 (:printer floating-point-fp ((op '(#b000 #b100))))
2110 (if (fp-reg-tn-p source)
2111 (emit-byte segment #b11011000)
2112 (emit-byte segment #b11011100))
2113 (emit-fp-op segment source #b100)))
2115 ;;; Subtract double, reverse:
2116 ;;; st(0) = memory or st(i) - st(0).
2117 (define-instruction fsubrd (segment source)
2118 (:printer floating-point ((op '(#b100 #b101))))
2119 (:printer floating-point-fp ((op '(#b000 #b101))))
2121 (if (fp-reg-tn-p source)
2122 (emit-byte segment #b11011000)
2123 (emit-byte segment #b11011100))
2124 (emit-fp-op segment source #b101)))
2126 ;;; Subtract double, destination st(i):
2127 ;;; st(i) = st(i) - st(0).
2129 ;;; ASM386 syntax: FSUB ST(i), ST
2130 ;;; Gdb syntax: fsubr %st,%st(i)
2131 (define-instruction fsub-sti (segment destination)
2132 (:printer floating-point-fp ((op '(#b100 #b101))))
2134 (aver (fp-reg-tn-p destination))
2135 (emit-byte segment #b11011100)
2136 (emit-fp-op segment destination #b101)))
2138 (define-instruction fsubp-sti (segment destination)
2139 (:printer floating-point-fp ((op '(#b110 #b101))))
2141 (aver (fp-reg-tn-p destination))
2142 (emit-byte segment #b11011110)
2143 (emit-fp-op segment destination #b101)))
2145 ;;; Subtract double, reverse, destination st(i):
2146 ;;; st(i) = st(0) - st(i).
2148 ;;; ASM386 syntax: FSUBR ST(i), ST
2149 ;;; Gdb syntax: fsub %st,%st(i)
2150 (define-instruction fsubr-sti (segment destination)
2151 (:printer floating-point-fp ((op '(#b100 #b100))))
2153 (aver (fp-reg-tn-p destination))
2154 (emit-byte segment #b11011100)
2155 (emit-fp-op segment destination #b100)))
2157 (define-instruction fsubrp-sti (segment destination)
2158 (:printer floating-point-fp ((op '(#b110 #b100))))
2160 (aver (fp-reg-tn-p destination))
2161 (emit-byte segment #b11011110)
2162 (emit-fp-op segment destination #b100)))
2164 ;;; Multiply single:
2165 ;;; st(0) = st(0) * memory or st(i).
2166 (define-instruction fmul (segment source)
2167 (:printer floating-point ((op '(#b000 #b001))))
2169 (emit-byte segment #b11011000)
2170 (emit-fp-op segment source #b001)))
2172 ;;; Multiply double:
2173 ;;; st(0) = st(0) * memory or st(i).
2174 (define-instruction fmuld (segment source)
2175 (:printer floating-point ((op '(#b100 #b001))))
2176 (:printer floating-point-fp ((op '(#b000 #b001))))
2178 (if (fp-reg-tn-p source)
2179 (emit-byte segment #b11011000)
2180 (emit-byte segment #b11011100))
2181 (emit-fp-op segment source #b001)))
2183 ;;; Multiply double, destination st(i):
2184 ;;; st(i) = st(i) * st(0).
2185 (define-instruction fmul-sti (segment destination)
2186 (:printer floating-point-fp ((op '(#b100 #b001))))
2188 (aver (fp-reg-tn-p destination))
2189 (emit-byte segment #b11011100)
2190 (emit-fp-op segment destination #b001)))
2193 ;;; st(0) = st(0) / memory or st(i).
2194 (define-instruction fdiv (segment source)
2195 (:printer floating-point ((op '(#b000 #b110))))
2197 (emit-byte segment #b11011000)
2198 (emit-fp-op segment source #b110)))
2200 ;;; Divide single, reverse:
2201 ;;; st(0) = memory or st(i) / st(0).
2202 (define-instruction fdivr (segment source)
2203 (:printer floating-point ((op '(#b000 #b111))))
2205 (emit-byte segment #b11011000)
2206 (emit-fp-op segment source #b111)))
2209 ;;; st(0) = st(0) / memory or st(i).
2210 (define-instruction fdivd (segment source)
2211 (:printer floating-point ((op '(#b100 #b110))))
2212 (:printer floating-point-fp ((op '(#b000 #b110))))
2214 (if (fp-reg-tn-p source)
2215 (emit-byte segment #b11011000)
2216 (emit-byte segment #b11011100))
2217 (emit-fp-op segment source #b110)))
2219 ;;; Divide double, reverse:
2220 ;;; st(0) = memory or st(i) / st(0).
2221 (define-instruction fdivrd (segment source)
2222 (:printer floating-point ((op '(#b100 #b111))))
2223 (:printer floating-point-fp ((op '(#b000 #b111))))
2225 (if (fp-reg-tn-p source)
2226 (emit-byte segment #b11011000)
2227 (emit-byte segment #b11011100))
2228 (emit-fp-op segment source #b111)))
2230 ;;; Divide double, destination st(i):
2231 ;;; st(i) = st(i) / st(0).
2233 ;;; ASM386 syntax: FDIV ST(i), ST
2234 ;;; Gdb syntax: fdivr %st,%st(i)
2235 (define-instruction fdiv-sti (segment destination)
2236 (:printer floating-point-fp ((op '(#b100 #b111))))
2238 (aver (fp-reg-tn-p destination))
2239 (emit-byte segment #b11011100)
2240 (emit-fp-op segment destination #b111)))
2242 ;;; Divide double, reverse, destination st(i):
2243 ;;; st(i) = st(0) / st(i).
2245 ;;; ASM386 syntax: FDIVR ST(i), ST
2246 ;;; Gdb syntax: fdiv %st,%st(i)
2247 (define-instruction fdivr-sti (segment destination)
2248 (:printer floating-point-fp ((op '(#b100 #b110))))
2250 (aver (fp-reg-tn-p destination))
2251 (emit-byte segment #b11011100)
2252 (emit-fp-op segment destination #b110)))
2254 ;;; Exchange fr0 with fr(n). (There is no double precision variant.)
2255 (define-instruction fxch (segment source)
2256 (:printer floating-point-fp ((op '(#b001 #b001))))
2258 (unless (and (tn-p source)
2259 (eq (sb-name (sc-sb (tn-sc source))) 'float-registers))
2261 (emit-byte segment #b11011001)
2262 (emit-fp-op segment source #b001)))
2264 ;;; Push 32-bit integer to st0.
2265 (define-instruction fild (segment source)
2266 (:printer floating-point ((op '(#b011 #b000))))
2268 (emit-byte segment #b11011011)
2269 (emit-fp-op segment source #b000)))
2271 ;;; Push 64-bit integer to st0.
2272 (define-instruction fildl (segment source)
2273 (:printer floating-point ((op '(#b111 #b101))))
2275 (emit-byte segment #b11011111)
2276 (emit-fp-op segment source #b101)))
2278 ;;; Store 32-bit integer.
2279 (define-instruction fist (segment dest)
2280 (:printer floating-point ((op '(#b011 #b010))))
2282 (emit-byte segment #b11011011)
2283 (emit-fp-op segment dest #b010)))
2285 ;;; Store and pop 32-bit integer.
2286 (define-instruction fistp (segment dest)
2287 (:printer floating-point ((op '(#b011 #b011))))
2289 (emit-byte segment #b11011011)
2290 (emit-fp-op segment dest #b011)))
2292 ;;; Store and pop 64-bit integer.
2293 (define-instruction fistpl (segment dest)
2294 (:printer floating-point ((op '(#b111 #b111))))
2296 (emit-byte segment #b11011111)
2297 (emit-fp-op segment dest #b111)))
2299 ;;; Store single from st(0) and pop.
2300 (define-instruction fstp (segment dest)
2301 (:printer floating-point ((op '(#b001 #b011))))
2303 (cond ((fp-reg-tn-p dest)
2304 (emit-byte segment #b11011101)
2305 (emit-fp-op segment dest #b011))
2307 (emit-byte segment #b11011001)
2308 (emit-fp-op segment dest #b011)))))
2310 ;;; Store double from st(0) and pop.
2311 (define-instruction fstpd (segment dest)
2312 (:printer floating-point ((op '(#b101 #b011))))
2313 (:printer floating-point-fp ((op '(#b101 #b011))))
2315 (cond ((fp-reg-tn-p dest)
2316 (emit-byte segment #b11011101)
2317 (emit-fp-op segment dest #b011))
2319 (emit-byte segment #b11011101)
2320 (emit-fp-op segment dest #b011)))))
2322 ;;; Store long from st(0) and pop.
2323 (define-instruction fstpl (segment dest)
2324 (:printer floating-point ((op '(#b011 #b111))))
2326 (emit-byte segment #b11011011)
2327 (emit-fp-op segment dest #b111)))
2329 ;;; Decrement stack-top pointer.
2330 (define-instruction fdecstp (segment)
2331 (:printer floating-point-no ((op #b10110)))
2333 (emit-byte segment #b11011001)
2334 (emit-byte segment #b11110110)))
2336 ;;; Increment stack-top pointer.
2337 (define-instruction fincstp (segment)
2338 (:printer floating-point-no ((op #b10111)))
2340 (emit-byte segment #b11011001)
2341 (emit-byte segment #b11110111)))
2343 ;;; Free fp register.
2344 (define-instruction ffree (segment dest)
2345 (:printer floating-point-fp ((op '(#b101 #b000))))
2347 (emit-byte segment #b11011101)
2348 (emit-fp-op segment dest #b000)))
2350 (define-instruction fabs (segment)
2351 (:printer floating-point-no ((op #b00001)))
2353 (emit-byte segment #b11011001)
2354 (emit-byte segment #b11100001)))
2356 (define-instruction fchs (segment)
2357 (:printer floating-point-no ((op #b00000)))
2359 (emit-byte segment #b11011001)
2360 (emit-byte segment #b11100000)))
2362 (define-instruction frndint(segment)
2363 (:printer floating-point-no ((op #b11100)))
2365 (emit-byte segment #b11011001)
2366 (emit-byte segment #b11111100)))
2369 (define-instruction fninit(segment)
2370 (:printer floating-point-5 ((op #b00011)))
2372 (emit-byte segment #b11011011)
2373 (emit-byte segment #b11100011)))
2375 ;;; Store Status Word to AX.
2376 (define-instruction fnstsw(segment)
2377 (:printer floating-point-st ((op #b00000)))
2379 (emit-byte segment #b11011111)
2380 (emit-byte segment #b11100000)))
2382 ;;; Load Control Word.
2384 ;;; src must be a memory location
2385 (define-instruction fldcw(segment src)
2386 (:printer floating-point ((op '(#b001 #b101))))
2388 (emit-byte segment #b11011001)
2389 (emit-fp-op segment src #b101)))
2391 ;;; Store Control Word.
2392 (define-instruction fnstcw(segment dst)
2393 (:printer floating-point ((op '(#b001 #b111))))
2395 (emit-byte segment #b11011001)
2396 (emit-fp-op segment dst #b111)))
2398 ;;; Store FP Environment.
2399 (define-instruction fstenv(segment dst)
2400 (:printer floating-point ((op '(#b001 #b110))))
2402 (emit-byte segment #b11011001)
2403 (emit-fp-op segment dst #b110)))
2405 ;;; Restore FP Environment.
2406 (define-instruction fldenv(segment src)
2407 (:printer floating-point ((op '(#b001 #b100))))
2409 (emit-byte segment #b11011001)
2410 (emit-fp-op segment src #b100)))
2413 (define-instruction fsave(segment dst)
2414 (:printer floating-point ((op '(#b101 #b110))))
2416 (emit-byte segment #b11011101)
2417 (emit-fp-op segment dst #b110)))
2419 ;;; Restore FP State.
2420 (define-instruction frstor(segment src)
2421 (:printer floating-point ((op '(#b101 #b100))))
2423 (emit-byte segment #b11011101)
2424 (emit-fp-op segment src #b100)))
2426 ;;; Clear exceptions.
2427 (define-instruction fnclex(segment)
2428 (:printer floating-point-5 ((op #b00010)))
2430 (emit-byte segment #b11011011)
2431 (emit-byte segment #b11100010)))
2434 (define-instruction fcom (segment src)
2435 (:printer floating-point ((op '(#b000 #b010))))
2437 (emit-byte segment #b11011000)
2438 (emit-fp-op segment src #b010)))
2440 (define-instruction fcomd (segment src)
2441 (:printer floating-point ((op '(#b100 #b010))))
2442 (:printer floating-point-fp ((op '(#b000 #b010))))
2444 (if (fp-reg-tn-p src)
2445 (emit-byte segment #b11011000)
2446 (emit-byte segment #b11011100))
2447 (emit-fp-op segment src #b010)))
2449 ;;; Compare ST1 to ST0, popping the stack twice.
2450 (define-instruction fcompp (segment)
2451 (:printer floating-point-3 ((op '(#b110 #b011001))))
2453 (emit-byte segment #b11011110)
2454 (emit-byte segment #b11011001)))
2456 ;;; unordered comparison
2457 (define-instruction fucom (segment src)
2458 (:printer floating-point-fp ((op '(#b101 #b100))))
2460 (aver (fp-reg-tn-p src))
2461 (emit-byte segment #b11011101)
2462 (emit-fp-op segment src #b100)))
2464 (define-instruction ftst (segment)
2465 (:printer floating-point-no ((op #b00100)))
2467 (emit-byte segment #b11011001)
2468 (emit-byte segment #b11100100)))
2472 (define-instruction fsqrt(segment)
2473 (:printer floating-point-no ((op #b11010)))
2475 (emit-byte segment #b11011001)
2476 (emit-byte segment #b11111010)))
2478 (define-instruction fscale(segment)
2479 (:printer floating-point-no ((op #b11101)))
2481 (emit-byte segment #b11011001)
2482 (emit-byte segment #b11111101)))
2484 (define-instruction fxtract(segment)
2485 (:printer floating-point-no ((op #b10100)))
2487 (emit-byte segment #b11011001)
2488 (emit-byte segment #b11110100)))
2490 (define-instruction fsin(segment)
2491 (:printer floating-point-no ((op #b11110)))
2493 (emit-byte segment #b11011001)
2494 (emit-byte segment #b11111110)))
2496 (define-instruction fcos(segment)
2497 (:printer floating-point-no ((op #b11111)))
2499 (emit-byte segment #b11011001)
2500 (emit-byte segment #b11111111)))
2502 (define-instruction fprem1(segment)
2503 (:printer floating-point-no ((op #b10101)))
2505 (emit-byte segment #b11011001)
2506 (emit-byte segment #b11110101)))
2508 (define-instruction fprem(segment)
2509 (:printer floating-point-no ((op #b11000)))
2511 (emit-byte segment #b11011001)
2512 (emit-byte segment #b11111000)))
2514 (define-instruction fxam (segment)
2515 (:printer floating-point-no ((op #b00101)))
2517 (emit-byte segment #b11011001)
2518 (emit-byte segment #b11100101)))
2520 ;;; These do push/pop to stack and need special handling
2521 ;;; in any VOPs that use them. See the book.
2523 ;;; st0 <- st1*log2(st0)
2524 (define-instruction fyl2x(segment) ; pops stack
2525 (:printer floating-point-no ((op #b10001)))
2527 (emit-byte segment #b11011001)
2528 (emit-byte segment #b11110001)))
2530 (define-instruction fyl2xp1(segment)
2531 (:printer floating-point-no ((op #b11001)))
2533 (emit-byte segment #b11011001)
2534 (emit-byte segment #b11111001)))
2536 (define-instruction f2xm1(segment)
2537 (:printer floating-point-no ((op #b10000)))
2539 (emit-byte segment #b11011001)
2540 (emit-byte segment #b11110000)))
2542 (define-instruction fptan(segment) ; st(0) <- 1; st(1) <- tan
2543 (:printer floating-point-no ((op #b10010)))
2545 (emit-byte segment #b11011001)
2546 (emit-byte segment #b11110010)))
2548 (define-instruction fpatan(segment) ; POPS STACK
2549 (:printer floating-point-no ((op #b10011)))
2551 (emit-byte segment #b11011001)
2552 (emit-byte segment #b11110011)))
2554 ;;;; loading constants
2556 (define-instruction fldz(segment)
2557 (:printer floating-point-no ((op #b01110)))
2559 (emit-byte segment #b11011001)
2560 (emit-byte segment #b11101110)))
2562 (define-instruction fld1(segment)
2563 (:printer floating-point-no ((op #b01000)))
2565 (emit-byte segment #b11011001)
2566 (emit-byte segment #b11101000)))
2568 (define-instruction fldpi(segment)
2569 (:printer floating-point-no ((op #b01011)))
2571 (emit-byte segment #b11011001)
2572 (emit-byte segment #b11101011)))
2574 (define-instruction fldl2t(segment)
2575 (:printer floating-point-no ((op #b01001)))
2577 (emit-byte segment #b11011001)
2578 (emit-byte segment #b11101001)))
2580 (define-instruction fldl2e(segment)
2581 (:printer floating-point-no ((op #b01010)))
2583 (emit-byte segment #b11011001)
2584 (emit-byte segment #b11101010)))
2586 (define-instruction fldlg2(segment)
2587 (:printer floating-point-no ((op #b01100)))
2589 (emit-byte segment #b11011001)
2590 (emit-byte segment #b11101100)))
2592 (define-instruction fldln2(segment)
2593 (:printer floating-point-no ((op #b01101)))
2595 (emit-byte segment #b11011001)
2596 (emit-byte segment #b11101101)))