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-label (value stream dstate)
112 (declare (ignore dstate))
113 (sb!disassem:princ16 value stream))
115 ;;; Returns either an integer, meaning a register, or a list of
116 ;;; (BASE-REG OFFSET INDEX-REG INDEX-SCALE), where any component
117 ;;; may be missing or nil to indicate that it's not used or has the
118 ;;; obvious default value (e.g., 1 for the index-scale).
119 (defun prefilter-reg/mem (value dstate)
120 (declare (type list value)
121 (type sb!disassem:disassem-state dstate))
122 (let ((mod (car value))
124 (declare (type (unsigned-byte 2) mod)
125 (type (unsigned-byte 3) r/m))
131 (let ((sib (sb!disassem:read-suffix 8 dstate)))
132 (declare (type (unsigned-byte 8) sib))
133 (let ((base-reg (ldb (byte 3 0) sib))
134 (index-reg (ldb (byte 3 3) sib))
135 (index-scale (ldb (byte 2 6) sib)))
136 (declare (type (unsigned-byte 3) base-reg index-reg)
137 (type (unsigned-byte 2) index-scale))
141 (if (= base-reg #b101)
142 (sb!disassem:read-signed-suffix 32 dstate)
145 (sb!disassem:read-signed-suffix 8 dstate))
147 (sb!disassem:read-signed-suffix 32 dstate)))))
148 (list (if (and (= mod #b00) (= base-reg #b101)) nil base-reg)
150 (if (= index-reg #b100) nil index-reg)
151 (ash 1 index-scale))))))
152 ((and (= mod #b00) (= r/m #b101))
153 (list nil (sb!disassem:read-signed-suffix 32 dstate)) )
157 (list r/m (sb!disassem:read-signed-suffix 8 dstate)))
159 (list r/m (sb!disassem:read-signed-suffix 32 dstate))))))
162 ;;; This is a sort of bogus prefilter that just stores the info globally for
163 ;;; other people to use; it probably never gets printed.
164 (defun prefilter-width (value dstate)
165 (setf (sb!disassem:dstate-get-prop dstate 'width)
169 ;; set by a prefix instruction
170 (or (sb!disassem:dstate-get-prop dstate 'word-width)
171 +default-operand-size+)))
172 (when (not (eql word-width +default-operand-size+))
174 (setf (sb!disassem:dstate-get-prop dstate 'word-width)
175 +default-operand-size+))
178 (defun read-address (value dstate)
179 (declare (ignore value)) ; always nil anyway
180 (sb!disassem:read-suffix (width-bits *default-address-size*) dstate))
182 (defun width-bits (width)
192 ;;;; disassembler argument types
194 (sb!disassem:define-arg-type displacement
196 :use-label #'offset-next
197 :printer (lambda (value stream dstate)
198 (sb!disassem:maybe-note-assembler-routine value nil dstate)
199 (print-label value stream dstate)))
201 (sb!disassem:define-arg-type accum
202 :printer (lambda (value stream dstate)
203 (declare (ignore value)
205 (type sb!disassem:disassem-state dstate))
206 (print-reg 0 stream dstate)))
208 (sb!disassem:define-arg-type word-accum
209 :printer (lambda (value stream dstate)
210 (declare (ignore value)
212 (type sb!disassem:disassem-state dstate))
213 (print-word-reg 0 stream dstate)))
215 (sb!disassem:define-arg-type reg
216 :printer #'print-reg)
218 (sb!disassem:define-arg-type addr-reg
219 :printer #'print-addr-reg)
221 (sb!disassem:define-arg-type word-reg
222 :printer #'print-word-reg)
224 (sb!disassem:define-arg-type imm-addr
225 :prefilter #'read-address
226 :printer #'print-label)
228 (sb!disassem:define-arg-type imm-data
229 :prefilter (lambda (value dstate)
230 (declare (ignore value)) ; always nil anyway
231 (sb!disassem:read-suffix
232 (width-bits (sb!disassem:dstate-get-prop dstate 'width))
235 (sb!disassem:define-arg-type signed-imm-data
236 :prefilter (lambda (value dstate)
237 (declare (ignore value)) ; always nil anyway
238 (let ((width (sb!disassem:dstate-get-prop dstate 'width)))
239 (sb!disassem:read-signed-suffix (width-bits width) dstate))))
241 (sb!disassem:define-arg-type signed-imm-byte
242 :prefilter (lambda (value dstate)
243 (declare (ignore value)) ; always nil anyway
244 (sb!disassem:read-signed-suffix 8 dstate)))
246 (sb!disassem:define-arg-type signed-imm-dword
247 :prefilter (lambda (value dstate)
248 (declare (ignore value)) ; always nil anyway
249 (sb!disassem:read-signed-suffix 32 dstate)))
251 (sb!disassem:define-arg-type imm-word
252 :prefilter (lambda (value dstate)
253 (declare (ignore value)) ; always nil anyway
255 (or (sb!disassem:dstate-get-prop dstate 'word-width)
256 +default-operand-size+)))
257 (sb!disassem:read-suffix (width-bits width) dstate))))
259 ;;; needed for the ret imm16 instruction
260 (sb!disassem:define-arg-type imm-word-16
261 :prefilter (lambda (value dstate)
262 (declare (ignore value)) ; always nil anyway
263 (sb!disassem:read-suffix 16 dstate)))
265 (sb!disassem:define-arg-type reg/mem
266 :prefilter #'prefilter-reg/mem
267 :printer #'print-reg/mem)
268 (sb!disassem:define-arg-type sized-reg/mem
269 ;; Same as reg/mem, but prints an explicit size indicator for
270 ;; memory references.
271 :prefilter #'prefilter-reg/mem
272 :printer #'print-sized-reg/mem)
273 (sb!disassem:define-arg-type byte-reg/mem
274 :prefilter #'prefilter-reg/mem
275 :printer #'print-byte-reg/mem)
278 (eval-when (:compile-toplevel :load-toplevel :execute)
279 (defun print-fp-reg (value stream dstate)
280 (declare (ignore dstate))
281 (format stream "FR~D" value))
282 (defun prefilter-fp-reg (value dstate)
284 (declare (ignore dstate))
287 (sb!disassem:define-arg-type fp-reg
288 :prefilter #'prefilter-fp-reg
289 :printer #'print-fp-reg)
291 (sb!disassem:define-arg-type width
292 :prefilter #'prefilter-width
293 :printer (lambda (value stream dstate)
296 (and (numberp value) (zerop value))) ; zzz jrd
299 ;; set by a prefix instruction
300 (or (sb!disassem:dstate-get-prop dstate 'word-width)
301 +default-operand-size+)))
302 (princ (schar (symbol-name word-width) 0) stream)))))
304 (eval-when (:compile-toplevel :load-toplevel :execute)
305 (defparameter *conditions*
308 (:b . 2) (:nae . 2) (:c . 2)
309 (:nb . 3) (:ae . 3) (:nc . 3)
310 (:eq . 4) (:e . 4) (:z . 4)
317 (:np . 11) (:po . 11)
318 (:l . 12) (:nge . 12)
319 (:nl . 13) (:ge . 13)
320 (:le . 14) (:ng . 14)
321 (:nle . 15) (:g . 15)))
322 (defparameter *condition-name-vec*
323 (let ((vec (make-array 16 :initial-element nil)))
324 (dolist (cond *conditions*)
325 (when (null (aref vec (cdr cond)))
326 (setf (aref vec (cdr cond)) (car cond))))
330 ;;; Set assembler parameters. (In CMU CL, this was done with
331 ;;; a call to a macro DEF-ASSEMBLER-PARAMS.)
332 (eval-when (:compile-toplevel :load-toplevel :execute)
333 (setf sb!assem:*assem-scheduler-p* nil))
335 (sb!disassem:define-arg-type condition-code
336 :printer *condition-name-vec*)
338 (defun conditional-opcode (condition)
339 (cdr (assoc condition *conditions* :test #'eq)))
341 ;;;; disassembler instruction formats
343 (eval-when (:compile-toplevel :execute)
344 (defun swap-if (direction field1 separator field2)
345 `(:if (,direction :constant 0)
346 (,field1 ,separator ,field2)
347 (,field2 ,separator ,field1))))
349 (sb!disassem:define-instruction-format (byte 8 :default-printer '(:name))
350 (op :field (byte 8 0))
355 (sb!disassem:define-instruction-format (simple 8)
356 (op :field (byte 7 1))
357 (width :field (byte 1 0) :type 'width)
362 ;;; Same as simple, but with direction bit
363 (sb!disassem:define-instruction-format (simple-dir 8 :include 'simple)
364 (op :field (byte 6 2))
365 (dir :field (byte 1 1)))
367 ;;; Same as simple, but with the immediate value occurring by default,
368 ;;; and with an appropiate printer.
369 (sb!disassem:define-instruction-format (accum-imm 8
371 :default-printer '(:name
372 :tab accum ", " imm))
373 (imm :type 'imm-data))
375 (sb!disassem:define-instruction-format (reg-no-width 8
376 :default-printer '(:name :tab reg))
377 (op :field (byte 5 3))
378 (reg :field (byte 3 0) :type 'word-reg)
380 (accum :type 'word-accum)
383 ;;; adds a width field to reg-no-width
384 (sb!disassem:define-instruction-format (reg 8
385 :default-printer '(:name :tab reg))
386 (op :field (byte 4 4))
387 (width :field (byte 1 3) :type 'width)
388 (reg :field (byte 3 0) :type 'reg)
394 ;;; Same as reg, but with direction bit
395 (sb!disassem:define-instruction-format (reg-dir 8 :include 'reg)
396 (op :field (byte 3 5))
397 (dir :field (byte 1 4)))
399 (sb!disassem:define-instruction-format (two-bytes 16
400 :default-printer '(:name))
401 (op :fields (list (byte 8 0) (byte 8 8))))
403 (sb!disassem:define-instruction-format (reg-reg/mem 16
405 `(:name :tab reg ", " reg/mem))
406 (op :field (byte 7 1))
407 (width :field (byte 1 0) :type 'width)
408 (reg/mem :fields (list (byte 2 14) (byte 3 8))
410 (reg :field (byte 3 11) :type 'reg)
414 ;;; same as reg-reg/mem, but with direction bit
415 (sb!disassem:define-instruction-format (reg-reg/mem-dir 16
416 :include 'reg-reg/mem
420 ,(swap-if 'dir 'reg/mem ", " 'reg)))
421 (op :field (byte 6 2))
422 (dir :field (byte 1 1)))
424 ;;; Same as reg-rem/mem, but uses the reg field as a second op code.
425 (sb!disassem:define-instruction-format (reg/mem 16
426 :default-printer '(:name :tab reg/mem))
427 (op :fields (list (byte 7 1) (byte 3 11)))
428 (width :field (byte 1 0) :type 'width)
429 (reg/mem :fields (list (byte 2 14) (byte 3 8))
430 :type 'sized-reg/mem)
434 ;;; Same as reg/mem, but with the immediate value occurring by default,
435 ;;; and with an appropiate printer.
436 (sb!disassem:define-instruction-format (reg/mem-imm 16
439 '(:name :tab reg/mem ", " imm))
440 (reg/mem :type 'sized-reg/mem)
441 (imm :type 'imm-data))
443 ;;; Same as reg/mem, but with using the accumulator in the default printer
444 (sb!disassem:define-instruction-format
446 :include 'reg/mem :default-printer '(:name :tab accum ", " reg/mem))
447 (reg/mem :type 'reg/mem) ; don't need a size
448 (accum :type 'accum))
450 ;;; Same as reg-reg/mem, but with a prefix of #b00001111
451 (sb!disassem:define-instruction-format (ext-reg-reg/mem 24
453 `(:name :tab reg ", " reg/mem))
454 (prefix :field (byte 8 0) :value #b00001111)
455 (op :field (byte 7 9))
456 (width :field (byte 1 8) :type 'width)
457 (reg/mem :fields (list (byte 2 22) (byte 3 16))
459 (reg :field (byte 3 19) :type 'reg)
463 ;;; Same as reg/mem, but with a prefix of #b00001111
464 (sb!disassem:define-instruction-format (ext-reg/mem 24
465 :default-printer '(:name :tab reg/mem))
466 (prefix :field (byte 8 0) :value #b00001111)
467 (op :fields (list (byte 7 9) (byte 3 19)))
468 (width :field (byte 1 8) :type 'width)
469 (reg/mem :fields (list (byte 2 22) (byte 3 16))
470 :type 'sized-reg/mem)
474 ;;;; This section was added by jrd, for fp instructions.
476 ;;; regular fp inst to/from registers/memory
477 (sb!disassem:define-instruction-format (floating-point 16
479 `(:name :tab reg/mem))
480 (prefix :field (byte 5 3) :value #b11011)
481 (op :fields (list (byte 3 0) (byte 3 11)))
482 (reg/mem :fields (list (byte 2 14) (byte 3 8)) :type 'reg/mem))
484 ;;; fp insn to/from fp reg
485 (sb!disassem:define-instruction-format (floating-point-fp 16
486 :default-printer `(:name :tab fp-reg))
487 (prefix :field (byte 5 3) :value #b11011)
488 (suffix :field (byte 2 14) :value #b11)
489 (op :fields (list (byte 3 0) (byte 3 11)))
490 (fp-reg :field (byte 3 8) :type 'fp-reg))
492 ;;; fp insn to/from fp reg, with the reversed source/destination flag.
493 (sb!disassem:define-instruction-format
494 (floating-point-fp-d 16
495 :default-printer `(:name :tab ,(swap-if 'd "ST0" ", " 'fp-reg)))
496 (prefix :field (byte 5 3) :value #b11011)
497 (suffix :field (byte 2 14) :value #b11)
498 (op :fields (list (byte 2 0) (byte 3 11)))
499 (d :field (byte 1 2))
500 (fp-reg :field (byte 3 8) :type 'fp-reg))
503 ;;; (added by (?) pfw)
504 ;;; fp no operand isns
505 (sb!disassem:define-instruction-format (floating-point-no 16
506 :default-printer '(:name))
507 (prefix :field (byte 8 0) :value #b11011001)
508 (suffix :field (byte 3 13) :value #b111)
509 (op :field (byte 5 8)))
511 (sb!disassem:define-instruction-format (floating-point-3 16
512 :default-printer '(:name))
513 (prefix :field (byte 5 3) :value #b11011)
514 (suffix :field (byte 2 14) :value #b11)
515 (op :fields (list (byte 3 0) (byte 6 8))))
517 (sb!disassem:define-instruction-format (floating-point-5 16
518 :default-printer '(:name))
519 (prefix :field (byte 8 0) :value #b11011011)
520 (suffix :field (byte 3 13) :value #b111)
521 (op :field (byte 5 8)))
523 (sb!disassem:define-instruction-format (floating-point-st 16
524 :default-printer '(:name))
525 (prefix :field (byte 8 0) :value #b11011111)
526 (suffix :field (byte 3 13) :value #b111)
527 (op :field (byte 5 8)))
529 (sb!disassem:define-instruction-format (string-op 8
531 :default-printer '(:name width)))
533 (sb!disassem:define-instruction-format (short-cond-jump 16)
534 (op :field (byte 4 4))
535 (cc :field (byte 4 0) :type 'condition-code)
536 (label :field (byte 8 8) :type 'displacement))
538 (sb!disassem:define-instruction-format (short-jump 16
539 :default-printer '(:name :tab label))
540 (const :field (byte 4 4) :value #b1110)
541 (op :field (byte 4 0))
542 (label :field (byte 8 8) :type 'displacement))
544 (sb!disassem:define-instruction-format (near-cond-jump 16)
545 (op :fields (list (byte 8 0) (byte 4 12)) :value '(#b00001111 #b1000))
546 (cc :field (byte 4 8) :type 'condition-code)
547 ;; The disassembler currently doesn't let you have an instruction > 32 bits
548 ;; long, so we fake it by using a prefilter to read the offset.
549 (label :type 'displacement
550 :prefilter (lambda (value dstate)
551 (declare (ignore value)) ; always nil anyway
552 (sb!disassem:read-signed-suffix 32 dstate))))
554 (sb!disassem:define-instruction-format (near-jump 8
555 :default-printer '(:name :tab label))
556 (op :field (byte 8 0))
557 ;; The disassembler currently doesn't let you have an instruction > 32 bits
558 ;; long, so we fake it by using a prefilter to read the address.
559 (label :type 'displacement
560 :prefilter (lambda (value dstate)
561 (declare (ignore value)) ; always nil anyway
562 (sb!disassem:read-signed-suffix 32 dstate))))
565 (sb!disassem:define-instruction-format (cond-set 24
566 :default-printer '('set cc :tab reg/mem))
567 (prefix :field (byte 8 0) :value #b00001111)
568 (op :field (byte 4 12) :value #b1001)
569 (cc :field (byte 4 8) :type 'condition-code)
570 (reg/mem :fields (list (byte 2 22) (byte 3 16))
572 (reg :field (byte 3 19) :value #b000))
574 (sb!disassem:define-instruction-format (enter-format 32
575 :default-printer '(:name
577 (:unless (:constant 0)
579 (op :field (byte 8 0))
580 (disp :field (byte 16 8))
581 (level :field (byte 8 24)))
583 ;;; Single byte instruction with an immediate byte argument.
584 (sb!disassem:define-instruction-format (byte-imm 16
585 :default-printer '(:name :tab code))
586 (op :field (byte 8 0))
587 (code :field (byte 8 8)))
589 ;;;; primitive emitters
591 (define-bitfield-emitter emit-word 16
594 (define-bitfield-emitter emit-dword 32
597 (define-bitfield-emitter emit-byte-with-reg 8
598 (byte 5 3) (byte 3 0))
600 (define-bitfield-emitter emit-mod-reg-r/m-byte 8
601 (byte 2 6) (byte 3 3) (byte 3 0))
603 (define-bitfield-emitter emit-sib-byte 8
604 (byte 2 6) (byte 3 3) (byte 3 0))
608 (defun emit-absolute-fixup (segment fixup)
609 (note-fixup segment :absolute fixup)
610 (let ((offset (fixup-offset fixup)))
612 (emit-back-patch segment
613 4 ; FIXME: sb!vm:n-word-bytes
614 (lambda (segment posn)
615 (declare (ignore posn))
617 (- (+ (component-header-length)
618 (or (label-position offset)
620 other-pointer-lowtag))))
621 (emit-dword segment (or offset 0)))))
623 (defun emit-relative-fixup (segment fixup)
624 (note-fixup segment :relative fixup)
625 (emit-dword segment (or (fixup-offset fixup) 0)))
627 ;;;; the effective-address (ea) structure
629 (defun reg-tn-encoding (tn)
630 (declare (type tn tn))
631 (aver (eq (sb-name (sc-sb (tn-sc tn))) 'registers))
632 (let ((offset (tn-offset tn)))
633 (logior (ash (logand offset 1) 2)
636 (defstruct (ea (:constructor make-ea (size &key base index scale disp))
638 (size nil :type (member :byte :word :dword))
639 (base nil :type (or tn null))
640 (index nil :type (or tn null))
641 (scale 1 :type (member 1 2 4 8))
642 (disp 0 :type (or (signed-byte 32) fixup)))
643 (def!method print-object ((ea ea) stream)
644 (cond ((or *print-escape* *print-readably*)
645 (print-unreadable-object (ea stream :type t)
647 "~S~@[ base=~S~]~@[ index=~S~]~@[ scale=~S~]~@[ disp=~S~]"
651 (let ((scale (ea-scale ea)))
652 (if (= scale 1) nil scale))
655 (format stream "~A PTR [" (symbol-name (ea-size ea)))
657 (write-string (sb!c::location-print-name (ea-base ea)) stream)
659 (write-string "+" stream)))
661 (write-string (sb!c::location-print-name (ea-index ea)) stream))
662 (unless (= (ea-scale ea) 1)
663 (format stream "*~A" (ea-scale ea)))
664 (typecase (ea-disp ea)
667 (format stream "~@D" (ea-disp ea)))
669 (format stream "+~A" (ea-disp ea))))
670 (write-char #\] stream))))
672 (defun emit-ea (segment thing reg &optional allow-constants)
675 (ecase (sb-name (sc-sb (tn-sc thing)))
677 (emit-mod-reg-r/m-byte segment #b11 reg (reg-tn-encoding thing)))
679 ;; Convert stack tns into an index off of EBP.
680 (let ((disp (- (* (1+ (tn-offset thing)) n-word-bytes))))
681 (cond ((< -128 disp 127)
682 (emit-mod-reg-r/m-byte segment #b01 reg #b101)
683 (emit-byte segment disp))
685 (emit-mod-reg-r/m-byte segment #b10 reg #b101)
686 (emit-dword segment disp)))))
688 (unless allow-constants
690 "Constant TNs can only be directly used in MOV, PUSH, and CMP."))
691 (emit-mod-reg-r/m-byte segment #b00 reg #b101)
692 (emit-absolute-fixup segment
695 (- (* (tn-offset thing) n-word-bytes)
696 other-pointer-lowtag))))))
698 (let* ((base (ea-base thing))
699 (index (ea-index thing))
700 (scale (ea-scale thing))
701 (disp (ea-disp thing))
702 (mod (cond ((or (null base)
704 (not (= (reg-tn-encoding base) #b101))))
706 ((and (fixnump disp) (<= -128 disp 127))
710 (r/m (cond (index #b100)
712 (t (reg-tn-encoding base)))))
713 (emit-mod-reg-r/m-byte segment mod reg r/m)
715 (let ((ss (1- (integer-length scale)))
716 (index (if (null index)
718 (let ((index (reg-tn-encoding index)))
720 (error "can't index off of ESP")
722 (base (if (null base)
724 (reg-tn-encoding base))))
725 (emit-sib-byte segment ss index base)))
727 (emit-byte segment disp))
728 ((or (= mod #b10) (null base))
730 (emit-absolute-fixup segment disp)
731 (emit-dword segment disp))))))
733 (emit-mod-reg-r/m-byte segment #b00 reg #b101)
734 (emit-absolute-fixup segment thing))))
736 (defun fp-reg-tn-p (thing)
738 (eq (sb-name (sc-sb (tn-sc thing))) 'float-registers)))
740 ;;; like the above, but for fp-instructions--jrd
741 (defun emit-fp-op (segment thing op)
742 (if (fp-reg-tn-p thing)
743 (emit-byte segment (dpb op (byte 3 3) (dpb (tn-offset thing)
746 (emit-ea segment thing op)))
748 (defun byte-reg-p (thing)
750 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)
751 (member (sc-name (tn-sc thing)) *byte-sc-names*)
754 (defun byte-ea-p (thing)
756 (ea (eq (ea-size thing) :byte))
758 (and (member (sc-name (tn-sc thing)) *byte-sc-names*) t))
761 (defun word-reg-p (thing)
763 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)
764 (member (sc-name (tn-sc thing)) *word-sc-names*)
767 (defun word-ea-p (thing)
769 (ea (eq (ea-size thing) :word))
770 (tn (and (member (sc-name (tn-sc thing)) *word-sc-names*) t))
773 (defun dword-reg-p (thing)
775 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)
776 (member (sc-name (tn-sc thing)) *dword-sc-names*)
779 (defun dword-ea-p (thing)
781 (ea (eq (ea-size thing) :dword))
783 (and (member (sc-name (tn-sc thing)) *dword-sc-names*) t))
786 (defun register-p (thing)
788 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)))
790 (defun accumulator-p (thing)
791 (and (register-p thing)
792 (= (tn-offset thing) 0)))
796 (def!constant +operand-size-prefix-byte+ #b01100110)
798 (defun maybe-emit-operand-size-prefix (segment size)
799 (unless (or (eq size :byte) (eq size +default-operand-size+))
800 (emit-byte segment +operand-size-prefix-byte+)))
802 (defun operand-size (thing)
805 ;; FIXME: might as well be COND instead of having to use #. readmacro
806 ;; to hack up the code
807 (case (sc-name (tn-sc thing))
814 ;; added by jrd: float-registers is a separate size (?)
820 (error "can't tell the size of ~S ~S" thing (sc-name (tn-sc thing))))))
826 (defun matching-operand-size (dst src)
827 (let ((dst-size (operand-size dst))
828 (src-size (operand-size src)))
831 (if (eq dst-size src-size)
833 (error "size mismatch: ~S is a ~S and ~S is a ~S."
834 dst dst-size src src-size))
838 (error "can't tell the size of either ~S or ~S" dst src)))))
840 (defun emit-sized-immediate (segment size value)
843 (emit-byte segment value))
845 (emit-word segment value))
847 (emit-dword segment value))))
849 ;;;; general data transfer
851 (define-instruction mov (segment dst src)
852 ;; immediate to register
853 (:printer reg ((op #b1011) (imm nil :type 'imm-data))
854 '(:name :tab reg ", " imm))
855 ;; absolute mem to/from accumulator
856 (:printer simple-dir ((op #b101000) (imm nil :type 'imm-addr))
857 `(:name :tab ,(swap-if 'dir 'accum ", " '("[" imm "]"))))
858 ;; register to/from register/memory
859 (:printer reg-reg/mem-dir ((op #b100010)))
860 ;; immediate to register/memory
861 (:printer reg/mem-imm ((op '(#b1100011 #b000))))
864 (let ((size (matching-operand-size dst src)))
865 (maybe-emit-operand-size-prefix segment size)
866 (cond ((register-p dst)
867 (cond ((integerp src)
868 (emit-byte-with-reg segment
872 (reg-tn-encoding dst))
873 (emit-sized-immediate segment size src))
874 ((and (fixup-p src) (accumulator-p dst))
879 (emit-absolute-fixup segment src))
885 (emit-ea segment src (reg-tn-encoding dst) t))))
886 ((and (fixup-p dst) (accumulator-p src))
887 (emit-byte segment (if (eq size :byte) #b10100010 #b10100011))
888 (emit-absolute-fixup segment dst))
890 (emit-byte segment (if (eq size :byte) #b11000110 #b11000111))
891 (emit-ea segment dst #b000)
892 (emit-sized-immediate segment size src))
894 (emit-byte segment (if (eq size :byte) #b10001000 #b10001001))
895 (emit-ea segment dst (reg-tn-encoding src)))
897 (aver (eq size :dword))
898 (emit-byte segment #b11000111)
899 (emit-ea segment dst #b000)
900 (emit-absolute-fixup segment src))
902 (error "bogus arguments to MOV: ~S ~S" dst src))))))
904 (defun emit-move-with-extension (segment dst src opcode)
905 (aver (register-p dst))
906 (let ((dst-size (operand-size dst))
907 (src-size (operand-size src)))
910 (aver (eq src-size :byte))
911 (maybe-emit-operand-size-prefix segment :word)
912 (emit-byte segment #b00001111)
913 (emit-byte segment opcode)
914 (emit-ea segment src (reg-tn-encoding dst)))
918 (maybe-emit-operand-size-prefix segment :dword)
919 (emit-byte segment #b00001111)
920 (emit-byte segment opcode)
921 (emit-ea segment src (reg-tn-encoding dst)))
923 (emit-byte segment #b00001111)
924 (emit-byte segment (logior opcode 1))
925 (emit-ea segment src (reg-tn-encoding dst))))))))
927 (define-instruction movsx (segment dst src)
928 (:printer ext-reg-reg/mem ((op #b1011111) (reg nil :type 'word-reg)))
929 (:emitter (emit-move-with-extension segment dst src #b10111110)))
931 (define-instruction movzx (segment dst src)
932 (:printer ext-reg-reg/mem ((op #b1011011) (reg nil :type 'word-reg)))
933 (:emitter (emit-move-with-extension segment dst src #b10110110)))
935 (define-instruction push (segment src)
937 (:printer reg-no-width ((op #b01010)))
939 (:printer reg/mem ((op '(#b1111111 #b110)) (width 1)))
941 (:printer byte ((op #b01101010) (imm nil :type 'signed-imm-byte))
943 (:printer byte ((op #b01101000) (imm nil :type 'imm-word))
945 ;; ### segment registers?
948 (cond ((integerp src)
949 (cond ((<= -128 src 127)
950 (emit-byte segment #b01101010)
951 (emit-byte segment src))
953 (emit-byte segment #b01101000)
954 (emit-dword segment src))))
956 ;; Interpret the fixup as an immediate dword to push.
957 (emit-byte segment #b01101000)
958 (emit-absolute-fixup segment src))
960 (let ((size (operand-size src)))
961 (aver (not (eq size :byte)))
962 (maybe-emit-operand-size-prefix segment size)
963 (cond ((register-p src)
964 (emit-byte-with-reg segment #b01010 (reg-tn-encoding src)))
966 (emit-byte segment #b11111111)
967 (emit-ea segment src #b110 t))))))))
969 (define-instruction pusha (segment)
970 (:printer byte ((op #b01100000)))
972 (emit-byte segment #b01100000)))
974 (define-instruction pop (segment dst)
975 (:printer reg-no-width ((op #b01011)))
976 (:printer reg/mem ((op '(#b1000111 #b000)) (width 1)))
978 (let ((size (operand-size dst)))
979 (aver (not (eq size :byte)))
980 (maybe-emit-operand-size-prefix segment size)
981 (cond ((register-p dst)
982 (emit-byte-with-reg segment #b01011 (reg-tn-encoding dst)))
984 (emit-byte segment #b10001111)
985 (emit-ea segment dst #b000))))))
987 (define-instruction popa (segment)
988 (:printer byte ((op #b01100001)))
990 (emit-byte segment #b01100001)))
992 (define-instruction xchg (segment operand1 operand2)
993 ;; Register with accumulator.
994 (:printer reg-no-width ((op #b10010)) '(:name :tab accum ", " reg))
995 ;; Register/Memory with Register.
996 (:printer reg-reg/mem ((op #b1000011)))
998 (let ((size (matching-operand-size operand1 operand2)))
999 (maybe-emit-operand-size-prefix segment size)
1000 (labels ((xchg-acc-with-something (acc something)
1001 (if (and (not (eq size :byte)) (register-p something))
1002 (emit-byte-with-reg segment
1004 (reg-tn-encoding something))
1005 (xchg-reg-with-something acc something)))
1006 (xchg-reg-with-something (reg something)
1007 (emit-byte segment (if (eq size :byte) #b10000110 #b10000111))
1008 (emit-ea segment something (reg-tn-encoding reg))))
1009 (cond ((accumulator-p operand1)
1010 (xchg-acc-with-something operand1 operand2))
1011 ((accumulator-p operand2)
1012 (xchg-acc-with-something operand2 operand1))
1013 ((register-p operand1)
1014 (xchg-reg-with-something operand1 operand2))
1015 ((register-p operand2)
1016 (xchg-reg-with-something operand2 operand1))
1018 (error "bogus args to XCHG: ~S ~S" operand1 operand2)))))))
1020 (define-instruction lea (segment dst src)
1021 (:printer reg-reg/mem ((op #b1000110) (width 1)))
1023 (aver (dword-reg-p dst))
1024 (emit-byte segment #b10001101)
1025 (emit-ea segment src (reg-tn-encoding dst))))
1027 (define-instruction cmpxchg (segment dst src)
1028 ;; Register/Memory with Register.
1029 (:printer ext-reg-reg/mem ((op #b1011000)) '(:name :tab reg/mem ", " reg))
1031 (aver (register-p src))
1032 (let ((size (matching-operand-size src dst)))
1033 (maybe-emit-operand-size-prefix segment size)
1034 (emit-byte segment #b00001111)
1035 (emit-byte segment (if (eq size :byte) #b10110000 #b10110001))
1036 (emit-ea segment dst (reg-tn-encoding src)))))
1039 ;;;; flag control instructions
1041 ;;; CLC -- Clear Carry Flag.
1042 (define-instruction clc (segment)
1043 (:printer byte ((op #b11111000)))
1045 (emit-byte segment #b11111000)))
1047 ;;; CLD -- Clear Direction Flag.
1048 (define-instruction cld (segment)
1049 (:printer byte ((op #b11111100)))
1051 (emit-byte segment #b11111100)))
1053 ;;; CLI -- Clear Iterrupt Enable Flag.
1054 (define-instruction cli (segment)
1055 (:printer byte ((op #b11111010)))
1057 (emit-byte segment #b11111010)))
1059 ;;; CMC -- Complement Carry Flag.
1060 (define-instruction cmc (segment)
1061 (:printer byte ((op #b11110101)))
1063 (emit-byte segment #b11110101)))
1065 ;;; LAHF -- Load AH into flags.
1066 (define-instruction lahf (segment)
1067 (:printer byte ((op #b10011111)))
1069 (emit-byte segment #b10011111)))
1071 ;;; POPF -- Pop flags.
1072 (define-instruction popf (segment)
1073 (:printer byte ((op #b10011101)))
1075 (emit-byte segment #b10011101)))
1077 ;;; PUSHF -- push flags.
1078 (define-instruction pushf (segment)
1079 (:printer byte ((op #b10011100)))
1081 (emit-byte segment #b10011100)))
1083 ;;; SAHF -- Store AH into flags.
1084 (define-instruction sahf (segment)
1085 (:printer byte ((op #b10011110)))
1087 (emit-byte segment #b10011110)))
1089 ;;; STC -- Set Carry Flag.
1090 (define-instruction stc (segment)
1091 (:printer byte ((op #b11111001)))
1093 (emit-byte segment #b11111001)))
1095 ;;; STD -- Set Direction Flag.
1096 (define-instruction std (segment)
1097 (:printer byte ((op #b11111101)))
1099 (emit-byte segment #b11111101)))
1101 ;;; STI -- Set Interrupt Enable Flag.
1102 (define-instruction sti (segment)
1103 (:printer byte ((op #b11111011)))
1105 (emit-byte segment #b11111011)))
1109 (defun emit-random-arith-inst (name segment dst src opcode
1110 &optional allow-constants)
1111 (let ((size (matching-operand-size dst src)))
1112 (maybe-emit-operand-size-prefix segment size)
1115 (cond ((and (not (eq size :byte)) (<= -128 src 127))
1116 (emit-byte segment #b10000011)
1117 (emit-ea segment dst opcode allow-constants)
1118 (emit-byte segment src))
1119 ((accumulator-p dst)
1126 (emit-sized-immediate segment size src))
1128 (emit-byte segment (if (eq size :byte) #b10000000 #b10000001))
1129 (emit-ea segment dst opcode allow-constants)
1130 (emit-sized-immediate segment size src))))
1135 (if (eq size :byte) #b00000000 #b00000001)))
1136 (emit-ea segment dst (reg-tn-encoding src) allow-constants))
1141 (if (eq size :byte) #b00000010 #b00000011)))
1142 (emit-ea segment src (reg-tn-encoding dst) allow-constants))
1144 (error "bogus operands to ~A" name)))))
1146 (eval-when (:compile-toplevel :execute)
1147 (defun arith-inst-printer-list (subop)
1148 `((accum-imm ((op ,(dpb subop (byte 3 2) #b0000010))))
1149 (reg/mem-imm ((op (#b1000000 ,subop))))
1150 (reg/mem-imm ((op (#b1000001 ,subop))
1151 (imm nil :type signed-imm-byte)))
1152 (reg-reg/mem-dir ((op ,(dpb subop (byte 3 1) #b000000))))))
1155 (define-instruction add (segment dst src)
1156 (:printer-list (arith-inst-printer-list #b000))
1157 (:emitter (emit-random-arith-inst "ADD" segment dst src #b000)))
1159 (define-instruction adc (segment dst src)
1160 (:printer-list (arith-inst-printer-list #b010))
1161 (:emitter (emit-random-arith-inst "ADC" segment dst src #b010)))
1163 (define-instruction sub (segment dst src)
1164 (:printer-list (arith-inst-printer-list #b101))
1165 (:emitter (emit-random-arith-inst "SUB" segment dst src #b101)))
1167 (define-instruction sbb (segment dst src)
1168 (:printer-list (arith-inst-printer-list #b011))
1169 (:emitter (emit-random-arith-inst "SBB" segment dst src #b011)))
1171 (define-instruction cmp (segment dst src)
1172 (:printer-list (arith-inst-printer-list #b111))
1173 (:emitter (emit-random-arith-inst "CMP" segment dst src #b111 t)))
1175 (define-instruction inc (segment dst)
1177 (:printer reg-no-width ((op #b01000)))
1179 (:printer reg/mem ((op '(#b1111111 #b000))))
1181 (let ((size (operand-size dst)))
1182 (maybe-emit-operand-size-prefix segment size)
1183 (cond ((and (not (eq size :byte)) (register-p dst))
1184 (emit-byte-with-reg segment #b01000 (reg-tn-encoding dst)))
1186 (emit-byte segment (if (eq size :byte) #b11111110 #b11111111))
1187 (emit-ea segment dst #b000))))))
1189 (define-instruction dec (segment dst)
1191 (:printer reg-no-width ((op #b01001)))
1193 (:printer reg/mem ((op '(#b1111111 #b001))))
1195 (let ((size (operand-size dst)))
1196 (maybe-emit-operand-size-prefix segment size)
1197 (cond ((and (not (eq size :byte)) (register-p dst))
1198 (emit-byte-with-reg segment #b01001 (reg-tn-encoding dst)))
1200 (emit-byte segment (if (eq size :byte) #b11111110 #b11111111))
1201 (emit-ea segment dst #b001))))))
1203 (define-instruction neg (segment dst)
1204 (:printer reg/mem ((op '(#b1111011 #b011))))
1206 (let ((size (operand-size dst)))
1207 (maybe-emit-operand-size-prefix segment size)
1208 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1209 (emit-ea segment dst #b011))))
1211 (define-instruction aaa (segment)
1212 (:printer byte ((op #b00110111)))
1214 (emit-byte segment #b00110111)))
1216 (define-instruction aas (segment)
1217 (:printer byte ((op #b00111111)))
1219 (emit-byte segment #b00111111)))
1221 (define-instruction daa (segment)
1222 (:printer byte ((op #b00100111)))
1224 (emit-byte segment #b00100111)))
1226 (define-instruction das (segment)
1227 (:printer byte ((op #b00101111)))
1229 (emit-byte segment #b00101111)))
1231 (define-instruction mul (segment dst src)
1232 (:printer accum-reg/mem ((op '(#b1111011 #b100))))
1234 (let ((size (matching-operand-size dst src)))
1235 (aver (accumulator-p dst))
1236 (maybe-emit-operand-size-prefix segment size)
1237 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1238 (emit-ea segment src #b100))))
1240 (define-instruction imul (segment dst &optional src1 src2)
1241 (:printer accum-reg/mem ((op '(#b1111011 #b101))))
1242 (:printer ext-reg-reg/mem ((op #b1010111)))
1243 (:printer reg-reg/mem ((op #b0110100) (width 1) (imm nil :type 'imm-word))
1244 '(:name :tab reg ", " reg/mem ", " imm))
1245 (:printer reg-reg/mem ((op #b0110101) (width 1)
1246 (imm nil :type 'signed-imm-byte))
1247 '(:name :tab reg ", " reg/mem ", " imm))
1249 (flet ((r/m-with-immed-to-reg (reg r/m immed)
1250 (let* ((size (matching-operand-size reg r/m))
1251 (sx (and (not (eq size :byte)) (<= -128 immed 127))))
1252 (maybe-emit-operand-size-prefix segment size)
1253 (emit-byte segment (if sx #b01101011 #b01101001))
1254 (emit-ea segment r/m (reg-tn-encoding reg))
1256 (emit-byte segment immed)
1257 (emit-sized-immediate segment size immed)))))
1259 (r/m-with-immed-to-reg dst src1 src2))
1262 (r/m-with-immed-to-reg dst dst src1)
1263 (let ((size (matching-operand-size dst src1)))
1264 (maybe-emit-operand-size-prefix segment size)
1265 (emit-byte segment #b00001111)
1266 (emit-byte segment #b10101111)
1267 (emit-ea segment src1 (reg-tn-encoding dst)))))
1269 (let ((size (operand-size dst)))
1270 (maybe-emit-operand-size-prefix segment size)
1271 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1272 (emit-ea segment dst #b101)))))))
1274 (define-instruction div (segment dst src)
1275 (:printer accum-reg/mem ((op '(#b1111011 #b110))))
1277 (let ((size (matching-operand-size dst src)))
1278 (aver (accumulator-p dst))
1279 (maybe-emit-operand-size-prefix segment size)
1280 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1281 (emit-ea segment src #b110))))
1283 (define-instruction idiv (segment dst src)
1284 (:printer accum-reg/mem ((op '(#b1111011 #b111))))
1286 (let ((size (matching-operand-size dst src)))
1287 (aver (accumulator-p dst))
1288 (maybe-emit-operand-size-prefix segment size)
1289 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1290 (emit-ea segment src #b111))))
1292 (define-instruction aad (segment)
1293 (:printer two-bytes ((op '(#b11010101 #b00001010))))
1295 (emit-byte segment #b11010101)
1296 (emit-byte segment #b00001010)))
1298 (define-instruction aam (segment)
1299 (:printer two-bytes ((op '(#b11010100 #b00001010))))
1301 (emit-byte segment #b11010100)
1302 (emit-byte segment #b00001010)))
1304 ;;; CBW -- Convert Byte to Word. AX <- sign_xtnd(AL)
1305 (define-instruction cbw (segment)
1307 (maybe-emit-operand-size-prefix segment :word)
1308 (emit-byte segment #b10011000)))
1310 ;;; CWDE -- Convert Word To Double Word Extened. EAX <- sign_xtnd(AX)
1311 (define-instruction cwde (segment)
1313 (maybe-emit-operand-size-prefix segment :dword)
1314 (emit-byte segment #b10011000)))
1316 ;;; CWD -- Convert Word to Double Word. DX:AX <- sign_xtnd(AX)
1317 (define-instruction cwd (segment)
1319 (maybe-emit-operand-size-prefix segment :word)
1320 (emit-byte segment #b10011001)))
1322 ;;; CDQ -- Convert Double Word to Quad Word. EDX:EAX <- sign_xtnd(EAX)
1323 (define-instruction cdq (segment)
1324 (:printer byte ((op #b10011001)))
1326 (maybe-emit-operand-size-prefix segment :dword)
1327 (emit-byte segment #b10011001)))
1329 (define-instruction xadd (segment dst src)
1330 ;; Register/Memory with Register.
1331 (:printer ext-reg-reg/mem ((op #b1100000)) '(:name :tab reg/mem ", " reg))
1333 (aver (register-p src))
1334 (let ((size (matching-operand-size src dst)))
1335 (maybe-emit-operand-size-prefix segment size)
1336 (emit-byte segment #b00001111)
1337 (emit-byte segment (if (eq size :byte) #b11000000 #b11000001))
1338 (emit-ea segment dst (reg-tn-encoding src)))))
1343 (defun emit-shift-inst (segment dst amount opcode)
1344 (let ((size (operand-size dst)))
1345 (maybe-emit-operand-size-prefix segment size)
1346 (multiple-value-bind (major-opcode immed)
1348 (:cl (values #b11010010 nil))
1349 (1 (values #b11010000 nil))
1350 (t (values #b11000000 t)))
1352 (if (eq size :byte) major-opcode (logior major-opcode 1)))
1353 (emit-ea segment dst opcode)
1355 (emit-byte segment amount)))))
1357 (eval-when (:compile-toplevel :execute)
1358 (defun shift-inst-printer-list (subop)
1359 `((reg/mem ((op (#b1101000 ,subop)))
1360 (:name :tab reg/mem ", 1"))
1361 (reg/mem ((op (#b1101001 ,subop)))
1362 (:name :tab reg/mem ", " 'cl))
1363 (reg/mem-imm ((op (#b1100000 ,subop))
1364 (imm nil :type signed-imm-byte))))))
1366 (define-instruction rol (segment dst amount)
1368 (shift-inst-printer-list #b000))
1370 (emit-shift-inst segment dst amount #b000)))
1372 (define-instruction ror (segment dst amount)
1374 (shift-inst-printer-list #b001))
1376 (emit-shift-inst segment dst amount #b001)))
1378 (define-instruction rcl (segment dst amount)
1380 (shift-inst-printer-list #b010))
1382 (emit-shift-inst segment dst amount #b010)))
1384 (define-instruction rcr (segment dst amount)
1386 (shift-inst-printer-list #b011))
1388 (emit-shift-inst segment dst amount #b011)))
1390 (define-instruction shl (segment dst amount)
1392 (shift-inst-printer-list #b100))
1394 (emit-shift-inst segment dst amount #b100)))
1396 (define-instruction shr (segment dst amount)
1398 (shift-inst-printer-list #b101))
1400 (emit-shift-inst segment dst amount #b101)))
1402 (define-instruction sar (segment dst amount)
1404 (shift-inst-printer-list #b111))
1406 (emit-shift-inst segment dst amount #b111)))
1408 (defun emit-double-shift (segment opcode dst src amt)
1409 (let ((size (matching-operand-size dst src)))
1410 (when (eq size :byte)
1411 (error "Double shifts can only be used with words."))
1412 (maybe-emit-operand-size-prefix segment size)
1413 (emit-byte segment #b00001111)
1414 (emit-byte segment (dpb opcode (byte 1 3)
1415 (if (eq amt :cl) #b10100101 #b10100100)))
1417 (emit-ea segment dst src)
1418 (emit-ea segment dst (reg-tn-encoding src)) ; pw tries this
1419 (unless (eq amt :cl)
1420 (emit-byte segment amt))))
1422 (eval-when (:compile-toplevel :execute)
1423 (defun double-shift-inst-printer-list (op)
1425 (ext-reg-reg/mem-imm ((op ,(logior op #b100))
1426 (imm nil :type signed-imm-byte)))
1427 (ext-reg-reg/mem ((op ,(logior op #b101)))
1428 (:name :tab reg/mem ", " 'cl)))))
1430 (define-instruction shld (segment dst src amt)
1431 (:declare (type (or (member :cl) (mod 32)) amt))
1432 (:printer-list (double-shift-inst-printer-list #b10100000))
1434 (emit-double-shift segment #b0 dst src amt)))
1436 (define-instruction shrd (segment dst src amt)
1437 (:declare (type (or (member :cl) (mod 32)) amt))
1438 (:printer-list (double-shift-inst-printer-list #b10101000))
1440 (emit-double-shift segment #b1 dst src amt)))
1442 (define-instruction and (segment dst src)
1444 (arith-inst-printer-list #b100))
1446 (emit-random-arith-inst "AND" segment dst src #b100)))
1448 (define-instruction test (segment this that)
1449 (:printer accum-imm ((op #b1010100)))
1450 (:printer reg/mem-imm ((op '(#b1111011 #b000))))
1451 (:printer reg-reg/mem ((op #b1000010)))
1453 (let ((size (matching-operand-size this that)))
1454 (maybe-emit-operand-size-prefix segment size)
1455 (flet ((test-immed-and-something (immed something)
1456 (cond ((accumulator-p something)
1458 (if (eq size :byte) #b10101000 #b10101001))
1459 (emit-sized-immediate segment size immed))
1462 (if (eq size :byte) #b11110110 #b11110111))
1463 (emit-ea segment something #b000)
1464 (emit-sized-immediate segment size immed))))
1465 (test-reg-and-something (reg something)
1466 (emit-byte segment (if (eq size :byte) #b10000100 #b10000101))
1467 (emit-ea segment something (reg-tn-encoding reg))))
1468 (cond ((integerp that)
1469 (test-immed-and-something that this))
1471 (test-immed-and-something this that))
1473 (test-reg-and-something this that))
1475 (test-reg-and-something that this))
1477 (error "bogus operands for TEST: ~S and ~S" this that)))))))
1479 (define-instruction or (segment dst src)
1481 (arith-inst-printer-list #b001))
1483 (emit-random-arith-inst "OR" segment dst src #b001)))
1485 (define-instruction xor (segment dst src)
1487 (arith-inst-printer-list #b110))
1489 (emit-random-arith-inst "XOR" segment dst src #b110)))
1491 (define-instruction not (segment dst)
1492 (:printer reg/mem ((op '(#b1111011 #b010))))
1494 (let ((size (operand-size dst)))
1495 (maybe-emit-operand-size-prefix segment size)
1496 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1497 (emit-ea segment dst #b010))))
1499 ;;;; string manipulation
1501 (define-instruction cmps (segment size)
1502 (:printer string-op ((op #b1010011)))
1504 (maybe-emit-operand-size-prefix segment size)
1505 (emit-byte segment (if (eq size :byte) #b10100110 #b10100111))))
1507 (define-instruction ins (segment acc)
1508 (:printer string-op ((op #b0110110)))
1510 (let ((size (operand-size acc)))
1511 (aver (accumulator-p acc))
1512 (maybe-emit-operand-size-prefix segment size)
1513 (emit-byte segment (if (eq size :byte) #b01101100 #b01101101)))))
1515 (define-instruction lods (segment acc)
1516 (:printer string-op ((op #b1010110)))
1518 (let ((size (operand-size acc)))
1519 (aver (accumulator-p acc))
1520 (maybe-emit-operand-size-prefix segment size)
1521 (emit-byte segment (if (eq size :byte) #b10101100 #b10101101)))))
1523 (define-instruction movs (segment size)
1524 (:printer string-op ((op #b1010010)))
1526 (maybe-emit-operand-size-prefix segment size)
1527 (emit-byte segment (if (eq size :byte) #b10100100 #b10100101))))
1529 (define-instruction outs (segment acc)
1530 (:printer string-op ((op #b0110111)))
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) #b01101110 #b01101111)))))
1537 (define-instruction scas (segment acc)
1538 (:printer string-op ((op #b1010111)))
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) #b10101110 #b10101111)))))
1545 (define-instruction stos (segment acc)
1546 (:printer string-op ((op #b1010101)))
1548 (let ((size (operand-size acc)))
1549 (aver (accumulator-p acc))
1550 (maybe-emit-operand-size-prefix segment size)
1551 (emit-byte segment (if (eq size :byte) #b10101010 #b10101011)))))
1553 (define-instruction xlat (segment)
1554 (:printer byte ((op #b11010111)))
1556 (emit-byte segment #b11010111)))
1558 (define-instruction rep (segment)
1560 (emit-byte segment #b11110010)))
1562 (define-instruction repe (segment)
1563 (:printer byte ((op #b11110011)))
1565 (emit-byte segment #b11110011)))
1567 (define-instruction repne (segment)
1568 (:printer byte ((op #b11110010)))
1570 (emit-byte segment #b11110010)))
1573 ;;;; bit manipulation
1575 (define-instruction bsf (segment dst src)
1577 (let ((size (matching-operand-size dst src)))
1578 (when (eq size :byte)
1579 (error "can't scan bytes: ~S" src))
1580 (maybe-emit-operand-size-prefix segment size)
1581 (emit-byte segment #b00001111)
1582 (emit-byte segment #b10111100)
1583 (emit-ea segment src (reg-tn-encoding dst)))))
1585 (define-instruction bsr (segment dst src)
1587 (let ((size (matching-operand-size dst src)))
1588 (when (eq size :byte)
1589 (error "can't scan bytes: ~S" src))
1590 (maybe-emit-operand-size-prefix segment size)
1591 (emit-byte segment #b00001111)
1592 (emit-byte segment #b10111101)
1593 (emit-ea segment src (reg-tn-encoding dst)))))
1595 (defun emit-bit-test-and-mumble (segment src index opcode)
1596 (let ((size (operand-size src)))
1597 (when (eq size :byte)
1598 (error "can't scan bytes: ~S" src))
1599 (maybe-emit-operand-size-prefix segment size)
1600 (emit-byte segment #b00001111)
1601 (cond ((integerp index)
1602 (emit-byte segment #b10111010)
1603 (emit-ea segment src opcode)
1604 (emit-byte segment index))
1606 (emit-byte segment (dpb opcode (byte 3 3) #b10000011))
1607 (emit-ea segment src (reg-tn-encoding index))))))
1609 (define-instruction bt (segment src index)
1611 (emit-bit-test-and-mumble segment src index #b100)))
1613 (define-instruction btc (segment src index)
1615 (emit-bit-test-and-mumble segment src index #b111)))
1617 (define-instruction btr (segment src index)
1619 (emit-bit-test-and-mumble segment src index #b110)))
1621 (define-instruction bts (segment src index)
1623 (emit-bit-test-and-mumble segment src index #b101)))
1626 ;;;; control transfer
1628 (define-instruction call (segment where)
1629 (:printer near-jump ((op #b11101000)))
1630 (:printer reg/mem ((op '(#b1111111 #b010)) (width 1)))
1634 (emit-byte segment #b11101000)
1635 (emit-back-patch segment
1637 (lambda (segment posn)
1639 (- (label-position where)
1642 (emit-byte segment #b11101000)
1643 (emit-relative-fixup segment where))
1645 (emit-byte segment #b11111111)
1646 (emit-ea segment where #b010)))))
1648 (defun emit-byte-displacement-backpatch (segment target)
1649 (emit-back-patch segment
1651 (lambda (segment posn)
1652 (let ((disp (- (label-position target) (1+ posn))))
1653 (aver (<= -128 disp 127))
1654 (emit-byte segment disp)))))
1656 (define-instruction jmp (segment cond &optional where)
1657 ;; conditional jumps
1658 (:printer short-cond-jump ((op #b0111)) '('j cc :tab label))
1659 (:printer near-cond-jump () '('j cc :tab label))
1660 ;; unconditional jumps
1661 (:printer short-jump ((op #b1011)))
1662 (:printer near-jump ((op #b11101001)) )
1663 (:printer reg/mem ((op '(#b1111111 #b100)) (width 1)))
1668 (lambda (segment posn delta-if-after)
1669 (let ((disp (- (label-position where posn delta-if-after)
1671 (when (<= -128 disp 127)
1673 (dpb (conditional-opcode cond)
1676 (emit-byte-displacement-backpatch segment where)
1678 (lambda (segment posn)
1679 (let ((disp (- (label-position where) (+ posn 6))))
1680 (emit-byte segment #b00001111)
1682 (dpb (conditional-opcode cond)
1685 (emit-dword segment disp)))))
1686 ((label-p (setq where cond))
1689 (lambda (segment posn delta-if-after)
1690 (let ((disp (- (label-position where posn delta-if-after)
1692 (when (<= -128 disp 127)
1693 (emit-byte segment #b11101011)
1694 (emit-byte-displacement-backpatch segment where)
1696 (lambda (segment posn)
1697 (let ((disp (- (label-position where) (+ posn 5))))
1698 (emit-byte segment #b11101001)
1699 (emit-dword segment disp)))))
1701 (emit-byte segment #b11101001)
1702 (emit-relative-fixup segment where))
1704 (unless (or (ea-p where) (tn-p where))
1705 (error "don't know what to do with ~A" where))
1706 (emit-byte segment #b11111111)
1707 (emit-ea segment where #b100)))))
1709 (define-instruction jmp-short (segment label)
1711 (emit-byte segment #b11101011)
1712 (emit-byte-displacement-backpatch segment label)))
1714 (define-instruction ret (segment &optional stack-delta)
1715 (:printer byte ((op #b11000011)))
1716 (:printer byte ((op #b11000010) (imm nil :type 'imm-word-16))
1720 (emit-byte segment #b11000010)
1721 (emit-word segment stack-delta))
1723 (emit-byte segment #b11000011)))))
1725 (define-instruction jecxz (segment target)
1726 (:printer short-jump ((op #b0011)))
1728 (emit-byte segment #b11100011)
1729 (emit-byte-displacement-backpatch segment target)))
1731 (define-instruction loop (segment target)
1732 (:printer short-jump ((op #b0010)))
1734 (emit-byte segment #b11100010) ; pfw this was 11100011, or jecxz!!!!
1735 (emit-byte-displacement-backpatch segment target)))
1737 (define-instruction loopz (segment target)
1738 (:printer short-jump ((op #b0001)))
1740 (emit-byte segment #b11100001)
1741 (emit-byte-displacement-backpatch segment target)))
1743 (define-instruction loopnz (segment target)
1744 (:printer short-jump ((op #b0000)))
1746 (emit-byte segment #b11100000)
1747 (emit-byte-displacement-backpatch segment target)))
1749 ;;;; conditional byte set
1751 (define-instruction set (segment dst cond)
1752 (:printer cond-set ())
1754 (emit-byte segment #b00001111)
1755 (emit-byte segment (dpb (conditional-opcode cond) (byte 4 0) #b10010000))
1756 (emit-ea segment dst #b000)))
1760 (define-instruction enter (segment disp &optional (level 0))
1761 (:declare (type (unsigned-byte 16) disp)
1762 (type (unsigned-byte 8) level))
1763 (:printer enter-format ((op #b11001000)))
1765 (emit-byte segment #b11001000)
1766 (emit-word segment disp)
1767 (emit-byte segment level)))
1769 (define-instruction leave (segment)
1770 (:printer byte ((op #b11001001)))
1772 (emit-byte segment #b11001001)))
1774 ;;;; interrupt instructions
1776 (defun snarf-error-junk (sap offset &optional length-only)
1777 (let* ((length (sb!sys:sap-ref-8 sap offset))
1778 (vector (make-array length :element-type '(unsigned-byte 8))))
1779 (declare (type sb!sys:system-area-pointer sap)
1780 (type (unsigned-byte 8) length)
1781 (type (simple-array (unsigned-byte 8) (*)) vector))
1783 (values 0 (1+ length) nil nil))
1785 (sb!kernel:copy-from-system-area sap (* n-byte-bits (1+ offset))
1786 vector (* n-word-bits
1788 (* length n-byte-bits))
1789 (collect ((sc-offsets)
1791 (lengths 1) ; the length byte
1793 (error-number (sb!c:read-var-integer vector index)))
1796 (when (>= index length)
1798 (let ((old-index index))
1799 (sc-offsets (sb!c:read-var-integer vector index))
1800 (lengths (- index old-index))))
1801 (values error-number
1807 (defmacro break-cases (breaknum &body cases)
1808 (let ((bn-temp (gensym)))
1809 (collect ((clauses))
1810 (dolist (case cases)
1811 (clauses `((= ,bn-temp ,(car case)) ,@(cdr case))))
1812 `(let ((,bn-temp ,breaknum))
1813 (cond ,@(clauses))))))
1816 (defun break-control (chunk inst stream dstate)
1817 (declare (ignore inst))
1818 (flet ((nt (x) (if stream (sb!disassem:note x dstate))))
1819 ;; FIXME: Make sure that BYTE-IMM-CODE is defined. The genesis
1820 ;; map has it undefined; and it should be easier to look in the target
1821 ;; Lisp (with (DESCRIBE 'BYTE-IMM-CODE)) than to definitively deduce
1822 ;; from first principles whether it's defined in some way that genesis
1824 (case (byte-imm-code chunk dstate)
1827 (sb!disassem:handle-break-args #'snarf-error-junk stream dstate))
1830 (sb!disassem:handle-break-args #'snarf-error-junk stream dstate))
1832 (nt "breakpoint trap"))
1833 (#.pending-interrupt-trap
1834 (nt "pending interrupt trap"))
1837 (#.fun-end-breakpoint-trap
1838 (nt "function end breakpoint trap")))))
1840 (define-instruction break (segment code)
1841 (:declare (type (unsigned-byte 8) code))
1842 (:printer byte-imm ((op #b11001100)) '(:name :tab code)
1843 :control #'break-control)
1845 (emit-byte segment #b11001100)
1846 (emit-byte segment code)))
1848 (define-instruction int (segment number)
1849 (:declare (type (unsigned-byte 8) number))
1850 (:printer byte-imm ((op #b11001101)))
1854 (emit-byte segment #b11001100))
1856 (emit-byte segment #b11001101)
1857 (emit-byte segment number)))))
1859 (define-instruction into (segment)
1860 (:printer byte ((op #b11001110)))
1862 (emit-byte segment #b11001110)))
1864 (define-instruction bound (segment reg bounds)
1866 (let ((size (matching-operand-size reg bounds)))
1867 (when (eq size :byte)
1868 (error "can't bounds-test bytes: ~S" reg))
1869 (maybe-emit-operand-size-prefix segment size)
1870 (emit-byte segment #b01100010)
1871 (emit-ea segment bounds (reg-tn-encoding reg)))))
1873 (define-instruction iret (segment)
1874 (:printer byte ((op #b11001111)))
1876 (emit-byte segment #b11001111)))
1878 ;;;; processor control
1880 (define-instruction hlt (segment)
1881 (:printer byte ((op #b11110100)))
1883 (emit-byte segment #b11110100)))
1885 (define-instruction nop (segment)
1886 (:printer byte ((op #b10010000)))
1888 (emit-byte segment #b10010000)))
1890 (define-instruction wait (segment)
1891 (:printer byte ((op #b10011011)))
1893 (emit-byte segment #b10011011)))
1895 (define-instruction lock (segment)
1896 (:printer byte ((op #b11110000)))
1898 (emit-byte segment #b11110000)))
1900 ;;;; miscellaneous hackery
1902 (define-instruction byte (segment byte)
1904 (emit-byte segment byte)))
1906 (define-instruction word (segment word)
1908 (emit-word segment word)))
1910 (define-instruction dword (segment dword)
1912 (emit-dword segment dword)))
1914 (defun emit-header-data (segment type)
1915 (emit-back-patch segment
1917 (lambda (segment posn)
1921 (component-header-length))
1925 (define-instruction simple-fun-header-word (segment)
1927 (emit-header-data segment simple-fun-header-widetag)))
1929 (define-instruction lra-header-word (segment)
1931 (emit-header-data segment return-pc-header-widetag)))
1933 ;;;; fp instructions
1935 ;;;; FIXME: This section said "added by jrd", which should end up in CREDITS.
1937 ;;;; Note: We treat the single-precision and double-precision variants
1938 ;;;; as separate instructions.
1940 ;;; Load single to st(0).
1941 (define-instruction fld (segment source)
1942 (:printer floating-point ((op '(#b001 #b000))))
1944 (emit-byte segment #b11011001)
1945 (emit-fp-op segment source #b000)))
1947 ;;; Load double to st(0).
1948 (define-instruction fldd (segment source)
1949 (:printer floating-point ((op '(#b101 #b000))))
1950 (:printer floating-point-fp ((op '(#b001 #b000))))
1952 (if (fp-reg-tn-p source)
1953 (emit-byte segment #b11011001)
1954 (emit-byte segment #b11011101))
1955 (emit-fp-op segment source #b000)))
1957 ;;; Load long to st(0).
1958 (define-instruction fldl (segment source)
1959 (:printer floating-point ((op '(#b011 #b101))))
1961 (emit-byte segment #b11011011)
1962 (emit-fp-op segment source #b101)))
1964 ;;; Store single from st(0).
1965 (define-instruction fst (segment dest)
1966 (:printer floating-point ((op '(#b001 #b010))))
1968 (cond ((fp-reg-tn-p dest)
1969 (emit-byte segment #b11011101)
1970 (emit-fp-op segment dest #b010))
1972 (emit-byte segment #b11011001)
1973 (emit-fp-op segment dest #b010)))))
1975 ;;; Store double from st(0).
1976 (define-instruction fstd (segment dest)
1977 (:printer floating-point ((op '(#b101 #b010))))
1978 (:printer floating-point-fp ((op '(#b101 #b010))))
1980 (cond ((fp-reg-tn-p dest)
1981 (emit-byte segment #b11011101)
1982 (emit-fp-op segment dest #b010))
1984 (emit-byte segment #b11011101)
1985 (emit-fp-op segment dest #b010)))))
1987 ;;; Arithmetic ops are all done with at least one operand at top of
1988 ;;; stack. The other operand is is another register or a 32/64 bit
1991 ;;; dtc: I've tried to follow the Intel ASM386 conventions, but note
1992 ;;; that these conflict with the Gdb conventions for binops. To reduce
1993 ;;; the confusion I've added comments showing the mathamatical
1994 ;;; operation and the two syntaxes. By the ASM386 convention the
1995 ;;; instruction syntax is:
1998 ;;; or Fop Destination, Source
2000 ;;; If only one operand is given then it is the source and the
2001 ;;; destination is ST(0). There are reversed forms of the fsub and
2002 ;;; fdiv instructions inducated by an 'R' suffix.
2004 ;;; The mathematical operation for the non-reverse form is always:
2005 ;;; destination = destination op source
2007 ;;; For the reversed form it is:
2008 ;;; destination = source op destination
2010 ;;; The instructions below only accept one operand at present which is
2011 ;;; usually the source. I've hack in extra instructions to implement
2012 ;;; the fops with a ST(i) destination, these have a -sti suffix and
2013 ;;; the operand is the destination with the source being ST(0).
2016 ;;; st(0) = st(0) + memory or st(i).
2017 (define-instruction fadd (segment source)
2018 (:printer floating-point ((op '(#b000 #b000))))
2020 (emit-byte segment #b11011000)
2021 (emit-fp-op segment source #b000)))
2024 ;;; st(0) = st(0) + memory or st(i).
2025 (define-instruction faddd (segment source)
2026 (:printer floating-point ((op '(#b100 #b000))))
2027 (:printer floating-point-fp ((op '(#b000 #b000))))
2029 (if (fp-reg-tn-p source)
2030 (emit-byte segment #b11011000)
2031 (emit-byte segment #b11011100))
2032 (emit-fp-op segment source #b000)))
2034 ;;; Add double destination st(i):
2035 ;;; st(i) = st(0) + st(i).
2036 (define-instruction fadd-sti (segment destination)
2037 (:printer floating-point-fp ((op '(#b100 #b000))))
2039 (aver (fp-reg-tn-p destination))
2040 (emit-byte segment #b11011100)
2041 (emit-fp-op segment destination #b000)))
2043 (define-instruction faddp-sti (segment destination)
2044 (:printer floating-point-fp ((op '(#b110 #b000))))
2046 (aver (fp-reg-tn-p destination))
2047 (emit-byte segment #b11011110)
2048 (emit-fp-op segment destination #b000)))
2050 ;;; Subtract single:
2051 ;;; st(0) = st(0) - memory or st(i).
2052 (define-instruction fsub (segment source)
2053 (:printer floating-point ((op '(#b000 #b100))))
2055 (emit-byte segment #b11011000)
2056 (emit-fp-op segment source #b100)))
2058 ;;; Subtract single, reverse:
2059 ;;; st(0) = memory or st(i) - st(0).
2060 (define-instruction fsubr (segment source)
2061 (:printer floating-point ((op '(#b000 #b101))))
2063 (emit-byte segment #b11011000)
2064 (emit-fp-op segment source #b101)))
2066 ;;; Subtract double:
2067 ;;; st(0) = st(0) - memory or st(i).
2068 (define-instruction fsubd (segment source)
2069 (:printer floating-point ((op '(#b100 #b100))))
2070 (:printer floating-point-fp ((op '(#b000 #b100))))
2072 (if (fp-reg-tn-p source)
2073 (emit-byte segment #b11011000)
2074 (emit-byte segment #b11011100))
2075 (emit-fp-op segment source #b100)))
2077 ;;; Subtract double, reverse:
2078 ;;; st(0) = memory or st(i) - st(0).
2079 (define-instruction fsubrd (segment source)
2080 (:printer floating-point ((op '(#b100 #b101))))
2081 (:printer floating-point-fp ((op '(#b000 #b101))))
2083 (if (fp-reg-tn-p source)
2084 (emit-byte segment #b11011000)
2085 (emit-byte segment #b11011100))
2086 (emit-fp-op segment source #b101)))
2088 ;;; Subtract double, destination st(i):
2089 ;;; st(i) = st(i) - st(0).
2091 ;;; ASM386 syntax: FSUB ST(i), ST
2092 ;;; Gdb syntax: fsubr %st,%st(i)
2093 (define-instruction fsub-sti (segment destination)
2094 (:printer floating-point-fp ((op '(#b100 #b101))))
2096 (aver (fp-reg-tn-p destination))
2097 (emit-byte segment #b11011100)
2098 (emit-fp-op segment destination #b101)))
2100 (define-instruction fsubp-sti (segment destination)
2101 (:printer floating-point-fp ((op '(#b110 #b101))))
2103 (aver (fp-reg-tn-p destination))
2104 (emit-byte segment #b11011110)
2105 (emit-fp-op segment destination #b101)))
2107 ;;; Subtract double, reverse, destination st(i):
2108 ;;; st(i) = st(0) - st(i).
2110 ;;; ASM386 syntax: FSUBR ST(i), ST
2111 ;;; Gdb syntax: fsub %st,%st(i)
2112 (define-instruction fsubr-sti (segment destination)
2113 (:printer floating-point-fp ((op '(#b100 #b100))))
2115 (aver (fp-reg-tn-p destination))
2116 (emit-byte segment #b11011100)
2117 (emit-fp-op segment destination #b100)))
2119 (define-instruction fsubrp-sti (segment destination)
2120 (:printer floating-point-fp ((op '(#b110 #b100))))
2122 (aver (fp-reg-tn-p destination))
2123 (emit-byte segment #b11011110)
2124 (emit-fp-op segment destination #b100)))
2126 ;;; Multiply single:
2127 ;;; st(0) = st(0) * memory or st(i).
2128 (define-instruction fmul (segment source)
2129 (:printer floating-point ((op '(#b000 #b001))))
2131 (emit-byte segment #b11011000)
2132 (emit-fp-op segment source #b001)))
2134 ;;; Multiply double:
2135 ;;; st(0) = st(0) * memory or st(i).
2136 (define-instruction fmuld (segment source)
2137 (:printer floating-point ((op '(#b100 #b001))))
2138 (:printer floating-point-fp ((op '(#b000 #b001))))
2140 (if (fp-reg-tn-p source)
2141 (emit-byte segment #b11011000)
2142 (emit-byte segment #b11011100))
2143 (emit-fp-op segment source #b001)))
2145 ;;; Multiply double, destination st(i):
2146 ;;; st(i) = st(i) * st(0).
2147 (define-instruction fmul-sti (segment destination)
2148 (:printer floating-point-fp ((op '(#b100 #b001))))
2150 (aver (fp-reg-tn-p destination))
2151 (emit-byte segment #b11011100)
2152 (emit-fp-op segment destination #b001)))
2155 ;;; st(0) = st(0) / memory or st(i).
2156 (define-instruction fdiv (segment source)
2157 (:printer floating-point ((op '(#b000 #b110))))
2159 (emit-byte segment #b11011000)
2160 (emit-fp-op segment source #b110)))
2162 ;;; Divide single, reverse:
2163 ;;; st(0) = memory or st(i) / st(0).
2164 (define-instruction fdivr (segment source)
2165 (:printer floating-point ((op '(#b000 #b111))))
2167 (emit-byte segment #b11011000)
2168 (emit-fp-op segment source #b111)))
2171 ;;; st(0) = st(0) / memory or st(i).
2172 (define-instruction fdivd (segment source)
2173 (:printer floating-point ((op '(#b100 #b110))))
2174 (:printer floating-point-fp ((op '(#b000 #b110))))
2176 (if (fp-reg-tn-p source)
2177 (emit-byte segment #b11011000)
2178 (emit-byte segment #b11011100))
2179 (emit-fp-op segment source #b110)))
2181 ;;; Divide double, reverse:
2182 ;;; st(0) = memory or st(i) / st(0).
2183 (define-instruction fdivrd (segment source)
2184 (:printer floating-point ((op '(#b100 #b111))))
2185 (:printer floating-point-fp ((op '(#b000 #b111))))
2187 (if (fp-reg-tn-p source)
2188 (emit-byte segment #b11011000)
2189 (emit-byte segment #b11011100))
2190 (emit-fp-op segment source #b111)))
2192 ;;; Divide double, destination st(i):
2193 ;;; st(i) = st(i) / st(0).
2195 ;;; ASM386 syntax: FDIV ST(i), ST
2196 ;;; Gdb syntax: fdivr %st,%st(i)
2197 (define-instruction fdiv-sti (segment destination)
2198 (:printer floating-point-fp ((op '(#b100 #b111))))
2200 (aver (fp-reg-tn-p destination))
2201 (emit-byte segment #b11011100)
2202 (emit-fp-op segment destination #b111)))
2204 ;;; Divide double, reverse, destination st(i):
2205 ;;; st(i) = st(0) / st(i).
2207 ;;; ASM386 syntax: FDIVR ST(i), ST
2208 ;;; Gdb syntax: fdiv %st,%st(i)
2209 (define-instruction fdivr-sti (segment destination)
2210 (:printer floating-point-fp ((op '(#b100 #b110))))
2212 (aver (fp-reg-tn-p destination))
2213 (emit-byte segment #b11011100)
2214 (emit-fp-op segment destination #b110)))
2216 ;;; Exchange fr0 with fr(n). (There is no double precision variant.)
2217 (define-instruction fxch (segment source)
2218 (:printer floating-point-fp ((op '(#b001 #b001))))
2220 (unless (and (tn-p source)
2221 (eq (sb-name (sc-sb (tn-sc source))) 'float-registers))
2223 (emit-byte segment #b11011001)
2224 (emit-fp-op segment source #b001)))
2226 ;;; Push 32-bit integer to st0.
2227 (define-instruction fild (segment source)
2228 (:printer floating-point ((op '(#b011 #b000))))
2230 (emit-byte segment #b11011011)
2231 (emit-fp-op segment source #b000)))
2233 ;;; Push 64-bit integer to st0.
2234 (define-instruction fildl (segment source)
2235 (:printer floating-point ((op '(#b111 #b101))))
2237 (emit-byte segment #b11011111)
2238 (emit-fp-op segment source #b101)))
2240 ;;; Store 32-bit integer.
2241 (define-instruction fist (segment dest)
2242 (:printer floating-point ((op '(#b011 #b010))))
2244 (emit-byte segment #b11011011)
2245 (emit-fp-op segment dest #b010)))
2247 ;;; Store and pop 32-bit integer.
2248 (define-instruction fistp (segment dest)
2249 (:printer floating-point ((op '(#b011 #b011))))
2251 (emit-byte segment #b11011011)
2252 (emit-fp-op segment dest #b011)))
2254 ;;; Store and pop 64-bit integer.
2255 (define-instruction fistpl (segment dest)
2256 (:printer floating-point ((op '(#b111 #b111))))
2258 (emit-byte segment #b11011111)
2259 (emit-fp-op segment dest #b111)))
2261 ;;; Store single from st(0) and pop.
2262 (define-instruction fstp (segment dest)
2263 (:printer floating-point ((op '(#b001 #b011))))
2265 (cond ((fp-reg-tn-p dest)
2266 (emit-byte segment #b11011101)
2267 (emit-fp-op segment dest #b011))
2269 (emit-byte segment #b11011001)
2270 (emit-fp-op segment dest #b011)))))
2272 ;;; Store double from st(0) and pop.
2273 (define-instruction fstpd (segment dest)
2274 (:printer floating-point ((op '(#b101 #b011))))
2275 (:printer floating-point-fp ((op '(#b101 #b011))))
2277 (cond ((fp-reg-tn-p dest)
2278 (emit-byte segment #b11011101)
2279 (emit-fp-op segment dest #b011))
2281 (emit-byte segment #b11011101)
2282 (emit-fp-op segment dest #b011)))))
2284 ;;; Store long from st(0) and pop.
2285 (define-instruction fstpl (segment dest)
2286 (:printer floating-point ((op '(#b011 #b111))))
2288 (emit-byte segment #b11011011)
2289 (emit-fp-op segment dest #b111)))
2291 ;;; Decrement stack-top pointer.
2292 (define-instruction fdecstp (segment)
2293 (:printer floating-point-no ((op #b10110)))
2295 (emit-byte segment #b11011001)
2296 (emit-byte segment #b11110110)))
2298 ;;; Increment stack-top pointer.
2299 (define-instruction fincstp (segment)
2300 (:printer floating-point-no ((op #b10111)))
2302 (emit-byte segment #b11011001)
2303 (emit-byte segment #b11110111)))
2305 ;;; Free fp register.
2306 (define-instruction ffree (segment dest)
2307 (:printer floating-point-fp ((op '(#b101 #b000))))
2309 (emit-byte segment #b11011101)
2310 (emit-fp-op segment dest #b000)))
2312 (define-instruction fabs (segment)
2313 (:printer floating-point-no ((op #b00001)))
2315 (emit-byte segment #b11011001)
2316 (emit-byte segment #b11100001)))
2318 (define-instruction fchs (segment)
2319 (:printer floating-point-no ((op #b00000)))
2321 (emit-byte segment #b11011001)
2322 (emit-byte segment #b11100000)))
2324 (define-instruction frndint(segment)
2325 (:printer floating-point-no ((op #b11100)))
2327 (emit-byte segment #b11011001)
2328 (emit-byte segment #b11111100)))
2331 (define-instruction fninit(segment)
2332 (:printer floating-point-5 ((op #b00011)))
2334 (emit-byte segment #b11011011)
2335 (emit-byte segment #b11100011)))
2337 ;;; Store Status Word to AX.
2338 (define-instruction fnstsw(segment)
2339 (:printer floating-point-st ((op #b00000)))
2341 (emit-byte segment #b11011111)
2342 (emit-byte segment #b11100000)))
2344 ;;; Load Control Word.
2346 ;;; src must be a memory location
2347 (define-instruction fldcw(segment src)
2348 (:printer floating-point ((op '(#b001 #b101))))
2350 (emit-byte segment #b11011001)
2351 (emit-fp-op segment src #b101)))
2353 ;;; Store Control Word.
2354 (define-instruction fnstcw(segment dst)
2355 (:printer floating-point ((op '(#b001 #b111))))
2357 (emit-byte segment #b11011001)
2358 (emit-fp-op segment dst #b111)))
2360 ;;; Store FP Environment.
2361 (define-instruction fstenv(segment dst)
2362 (:printer floating-point ((op '(#b001 #b110))))
2364 (emit-byte segment #b11011001)
2365 (emit-fp-op segment dst #b110)))
2367 ;;; Restore FP Environment.
2368 (define-instruction fldenv(segment src)
2369 (:printer floating-point ((op '(#b001 #b100))))
2371 (emit-byte segment #b11011001)
2372 (emit-fp-op segment src #b100)))
2375 (define-instruction fsave(segment dst)
2376 (:printer floating-point ((op '(#b101 #b110))))
2378 (emit-byte segment #b11011101)
2379 (emit-fp-op segment dst #b110)))
2381 ;;; Restore FP State.
2382 (define-instruction frstor(segment src)
2383 (:printer floating-point ((op '(#b101 #b100))))
2385 (emit-byte segment #b11011101)
2386 (emit-fp-op segment src #b100)))
2388 ;;; Clear exceptions.
2389 (define-instruction fnclex(segment)
2390 (:printer floating-point-5 ((op #b00010)))
2392 (emit-byte segment #b11011011)
2393 (emit-byte segment #b11100010)))
2396 (define-instruction fcom (segment src)
2397 (:printer floating-point ((op '(#b000 #b010))))
2399 (emit-byte segment #b11011000)
2400 (emit-fp-op segment src #b010)))
2402 (define-instruction fcomd (segment src)
2403 (:printer floating-point ((op '(#b100 #b010))))
2404 (:printer floating-point-fp ((op '(#b000 #b010))))
2406 (if (fp-reg-tn-p src)
2407 (emit-byte segment #b11011000)
2408 (emit-byte segment #b11011100))
2409 (emit-fp-op segment src #b010)))
2411 ;;; Compare ST1 to ST0, popping the stack twice.
2412 (define-instruction fcompp (segment)
2413 (:printer floating-point-3 ((op '(#b110 #b011001))))
2415 (emit-byte segment #b11011110)
2416 (emit-byte segment #b11011001)))
2418 ;;; unordered comparison
2419 (define-instruction fucom (segment src)
2420 ;; XX Printer conflicts with frstor
2421 ;; (:printer floating-point ((op '(#b101 #b100))))
2423 (aver (fp-reg-tn-p src))
2424 (emit-byte segment #b11011101)
2425 (emit-fp-op segment src #b100)))
2427 (define-instruction ftst (segment)
2428 (:printer floating-point-no ((op #b00100)))
2430 (emit-byte segment #b11011001)
2431 (emit-byte segment #b11100100)))
2435 (define-instruction fsqrt(segment)
2436 (:printer floating-point-no ((op #b11010)))
2438 (emit-byte segment #b11011001)
2439 (emit-byte segment #b11111010)))
2441 (define-instruction fscale(segment)
2442 (:printer floating-point-no ((op #b11101)))
2444 (emit-byte segment #b11011001)
2445 (emit-byte segment #b11111101)))
2447 (define-instruction fxtract(segment)
2448 (:printer floating-point-no ((op #b10100)))
2450 (emit-byte segment #b11011001)
2451 (emit-byte segment #b11110100)))
2453 (define-instruction fsin(segment)
2454 (:printer floating-point-no ((op #b11110)))
2456 (emit-byte segment #b11011001)
2457 (emit-byte segment #b11111110)))
2459 (define-instruction fcos(segment)
2460 (:printer floating-point-no ((op #b11111)))
2462 (emit-byte segment #b11011001)
2463 (emit-byte segment #b11111111)))
2465 (define-instruction fprem1(segment)
2466 (:printer floating-point-no ((op #b10101)))
2468 (emit-byte segment #b11011001)
2469 (emit-byte segment #b11110101)))
2471 (define-instruction fprem(segment)
2472 (:printer floating-point-no ((op #b11000)))
2474 (emit-byte segment #b11011001)
2475 (emit-byte segment #b11111000)))
2477 (define-instruction fxam (segment)
2478 (:printer floating-point-no ((op #b00101)))
2480 (emit-byte segment #b11011001)
2481 (emit-byte segment #b11100101)))
2483 ;;; These do push/pop to stack and need special handling
2484 ;;; in any VOPs that use them. See the book.
2486 ;;; st0 <- st1*log2(st0)
2487 (define-instruction fyl2x(segment) ; pops stack
2488 (:printer floating-point-no ((op #b10001)))
2490 (emit-byte segment #b11011001)
2491 (emit-byte segment #b11110001)))
2493 (define-instruction fyl2xp1(segment)
2494 (:printer floating-point-no ((op #b11001)))
2496 (emit-byte segment #b11011001)
2497 (emit-byte segment #b11111001)))
2499 (define-instruction f2xm1(segment)
2500 (:printer floating-point-no ((op #b10000)))
2502 (emit-byte segment #b11011001)
2503 (emit-byte segment #b11110000)))
2505 (define-instruction fptan(segment) ; st(0) <- 1; st(1) <- tan
2506 (:printer floating-point-no ((op #b10010)))
2508 (emit-byte segment #b11011001)
2509 (emit-byte segment #b11110010)))
2511 (define-instruction fpatan(segment) ; POPS STACK
2512 (:printer floating-point-no ((op #b10011)))
2514 (emit-byte segment #b11011001)
2515 (emit-byte segment #b11110011)))
2517 ;;;; loading constants
2519 (define-instruction fldz(segment)
2520 (:printer floating-point-no ((op #b01110)))
2522 (emit-byte segment #b11011001)
2523 (emit-byte segment #b11101110)))
2525 (define-instruction fld1(segment)
2526 (:printer floating-point-no ((op #b01000)))
2528 (emit-byte segment #b11011001)
2529 (emit-byte segment #b11101000)))
2531 (define-instruction fldpi(segment)
2532 (:printer floating-point-no ((op #b01011)))
2534 (emit-byte segment #b11011001)
2535 (emit-byte segment #b11101011)))
2537 (define-instruction fldl2t(segment)
2538 (:printer floating-point-no ((op #b01001)))
2540 (emit-byte segment #b11011001)
2541 (emit-byte segment #b11101001)))
2543 (define-instruction fldl2e(segment)
2544 (:printer floating-point-no ((op #b01010)))
2546 (emit-byte segment #b11011001)
2547 (emit-byte segment #b11101010)))
2549 (define-instruction fldlg2(segment)
2550 (:printer floating-point-no ((op #b01100)))
2552 (emit-byte segment #b11011001)
2553 (emit-byte segment #b11101100)))
2555 (define-instruction fldln2(segment)
2556 (:printer floating-point-no ((op #b01101)))
2558 (emit-byte segment #b11011001)
2559 (emit-byte segment #b11101101)))