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)))))
1040 (define-instruction fs-segment-prefix (segment)
1042 (emit-byte segment #x64)))
1044 ;;;; flag control instructions
1046 ;;; CLC -- Clear Carry Flag.
1047 (define-instruction clc (segment)
1048 (:printer byte ((op #b11111000)))
1050 (emit-byte segment #b11111000)))
1052 ;;; CLD -- Clear Direction Flag.
1053 (define-instruction cld (segment)
1054 (:printer byte ((op #b11111100)))
1056 (emit-byte segment #b11111100)))
1058 ;;; CLI -- Clear Iterrupt Enable Flag.
1059 (define-instruction cli (segment)
1060 (:printer byte ((op #b11111010)))
1062 (emit-byte segment #b11111010)))
1064 ;;; CMC -- Complement Carry Flag.
1065 (define-instruction cmc (segment)
1066 (:printer byte ((op #b11110101)))
1068 (emit-byte segment #b11110101)))
1070 ;;; LAHF -- Load AH into flags.
1071 (define-instruction lahf (segment)
1072 (:printer byte ((op #b10011111)))
1074 (emit-byte segment #b10011111)))
1076 ;;; POPF -- Pop flags.
1077 (define-instruction popf (segment)
1078 (:printer byte ((op #b10011101)))
1080 (emit-byte segment #b10011101)))
1082 ;;; PUSHF -- push flags.
1083 (define-instruction pushf (segment)
1084 (:printer byte ((op #b10011100)))
1086 (emit-byte segment #b10011100)))
1088 ;;; SAHF -- Store AH into flags.
1089 (define-instruction sahf (segment)
1090 (:printer byte ((op #b10011110)))
1092 (emit-byte segment #b10011110)))
1094 ;;; STC -- Set Carry Flag.
1095 (define-instruction stc (segment)
1096 (:printer byte ((op #b11111001)))
1098 (emit-byte segment #b11111001)))
1100 ;;; STD -- Set Direction Flag.
1101 (define-instruction std (segment)
1102 (:printer byte ((op #b11111101)))
1104 (emit-byte segment #b11111101)))
1106 ;;; STI -- Set Interrupt Enable Flag.
1107 (define-instruction sti (segment)
1108 (:printer byte ((op #b11111011)))
1110 (emit-byte segment #b11111011)))
1114 (defun emit-random-arith-inst (name segment dst src opcode
1115 &optional allow-constants)
1116 (let ((size (matching-operand-size dst src)))
1117 (maybe-emit-operand-size-prefix segment size)
1120 (cond ((and (not (eq size :byte)) (<= -128 src 127))
1121 (emit-byte segment #b10000011)
1122 (emit-ea segment dst opcode allow-constants)
1123 (emit-byte segment src))
1124 ((accumulator-p dst)
1131 (emit-sized-immediate segment size src))
1133 (emit-byte segment (if (eq size :byte) #b10000000 #b10000001))
1134 (emit-ea segment dst opcode allow-constants)
1135 (emit-sized-immediate segment size src))))
1140 (if (eq size :byte) #b00000000 #b00000001)))
1141 (emit-ea segment dst (reg-tn-encoding src) allow-constants))
1146 (if (eq size :byte) #b00000010 #b00000011)))
1147 (emit-ea segment src (reg-tn-encoding dst) allow-constants))
1149 (error "bogus operands to ~A" name)))))
1151 (eval-when (:compile-toplevel :execute)
1152 (defun arith-inst-printer-list (subop)
1153 `((accum-imm ((op ,(dpb subop (byte 3 2) #b0000010))))
1154 (reg/mem-imm ((op (#b1000000 ,subop))))
1155 (reg/mem-imm ((op (#b1000001 ,subop))
1156 (imm nil :type signed-imm-byte)))
1157 (reg-reg/mem-dir ((op ,(dpb subop (byte 3 1) #b000000))))))
1160 (define-instruction add (segment dst src)
1161 (:printer-list (arith-inst-printer-list #b000))
1162 (:emitter (emit-random-arith-inst "ADD" segment dst src #b000)))
1164 (define-instruction adc (segment dst src)
1165 (:printer-list (arith-inst-printer-list #b010))
1166 (:emitter (emit-random-arith-inst "ADC" segment dst src #b010)))
1168 (define-instruction sub (segment dst src)
1169 (:printer-list (arith-inst-printer-list #b101))
1170 (:emitter (emit-random-arith-inst "SUB" segment dst src #b101)))
1172 (define-instruction sbb (segment dst src)
1173 (:printer-list (arith-inst-printer-list #b011))
1174 (:emitter (emit-random-arith-inst "SBB" segment dst src #b011)))
1176 (define-instruction cmp (segment dst src)
1177 (:printer-list (arith-inst-printer-list #b111))
1178 (:emitter (emit-random-arith-inst "CMP" segment dst src #b111 t)))
1180 (define-instruction inc (segment dst)
1182 (:printer reg-no-width ((op #b01000)))
1184 (:printer reg/mem ((op '(#b1111111 #b000))))
1186 (let ((size (operand-size dst)))
1187 (maybe-emit-operand-size-prefix segment size)
1188 (cond ((and (not (eq size :byte)) (register-p dst))
1189 (emit-byte-with-reg segment #b01000 (reg-tn-encoding dst)))
1191 (emit-byte segment (if (eq size :byte) #b11111110 #b11111111))
1192 (emit-ea segment dst #b000))))))
1194 (define-instruction dec (segment dst)
1196 (:printer reg-no-width ((op #b01001)))
1198 (:printer reg/mem ((op '(#b1111111 #b001))))
1200 (let ((size (operand-size dst)))
1201 (maybe-emit-operand-size-prefix segment size)
1202 (cond ((and (not (eq size :byte)) (register-p dst))
1203 (emit-byte-with-reg segment #b01001 (reg-tn-encoding dst)))
1205 (emit-byte segment (if (eq size :byte) #b11111110 #b11111111))
1206 (emit-ea segment dst #b001))))))
1208 (define-instruction neg (segment dst)
1209 (:printer reg/mem ((op '(#b1111011 #b011))))
1211 (let ((size (operand-size dst)))
1212 (maybe-emit-operand-size-prefix segment size)
1213 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1214 (emit-ea segment dst #b011))))
1216 (define-instruction aaa (segment)
1217 (:printer byte ((op #b00110111)))
1219 (emit-byte segment #b00110111)))
1221 (define-instruction aas (segment)
1222 (:printer byte ((op #b00111111)))
1224 (emit-byte segment #b00111111)))
1226 (define-instruction daa (segment)
1227 (:printer byte ((op #b00100111)))
1229 (emit-byte segment #b00100111)))
1231 (define-instruction das (segment)
1232 (:printer byte ((op #b00101111)))
1234 (emit-byte segment #b00101111)))
1236 (define-instruction mul (segment dst src)
1237 (:printer accum-reg/mem ((op '(#b1111011 #b100))))
1239 (let ((size (matching-operand-size dst src)))
1240 (aver (accumulator-p dst))
1241 (maybe-emit-operand-size-prefix segment size)
1242 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1243 (emit-ea segment src #b100))))
1245 (define-instruction imul (segment dst &optional src1 src2)
1246 (:printer accum-reg/mem ((op '(#b1111011 #b101))))
1247 (:printer ext-reg-reg/mem ((op #b1010111)))
1248 (:printer reg-reg/mem ((op #b0110100) (width 1) (imm nil :type 'imm-word))
1249 '(:name :tab reg ", " reg/mem ", " imm))
1250 (:printer reg-reg/mem ((op #b0110101) (width 1)
1251 (imm nil :type 'signed-imm-byte))
1252 '(:name :tab reg ", " reg/mem ", " imm))
1254 (flet ((r/m-with-immed-to-reg (reg r/m immed)
1255 (let* ((size (matching-operand-size reg r/m))
1256 (sx (and (not (eq size :byte)) (<= -128 immed 127))))
1257 (maybe-emit-operand-size-prefix segment size)
1258 (emit-byte segment (if sx #b01101011 #b01101001))
1259 (emit-ea segment r/m (reg-tn-encoding reg))
1261 (emit-byte segment immed)
1262 (emit-sized-immediate segment size immed)))))
1264 (r/m-with-immed-to-reg dst src1 src2))
1267 (r/m-with-immed-to-reg dst dst src1)
1268 (let ((size (matching-operand-size dst src1)))
1269 (maybe-emit-operand-size-prefix segment size)
1270 (emit-byte segment #b00001111)
1271 (emit-byte segment #b10101111)
1272 (emit-ea segment src1 (reg-tn-encoding dst)))))
1274 (let ((size (operand-size dst)))
1275 (maybe-emit-operand-size-prefix segment size)
1276 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1277 (emit-ea segment dst #b101)))))))
1279 (define-instruction div (segment dst src)
1280 (:printer accum-reg/mem ((op '(#b1111011 #b110))))
1282 (let ((size (matching-operand-size dst src)))
1283 (aver (accumulator-p dst))
1284 (maybe-emit-operand-size-prefix segment size)
1285 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1286 (emit-ea segment src #b110))))
1288 (define-instruction idiv (segment dst src)
1289 (:printer accum-reg/mem ((op '(#b1111011 #b111))))
1291 (let ((size (matching-operand-size dst src)))
1292 (aver (accumulator-p dst))
1293 (maybe-emit-operand-size-prefix segment size)
1294 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1295 (emit-ea segment src #b111))))
1297 (define-instruction aad (segment)
1298 (:printer two-bytes ((op '(#b11010101 #b00001010))))
1300 (emit-byte segment #b11010101)
1301 (emit-byte segment #b00001010)))
1303 (define-instruction aam (segment)
1304 (:printer two-bytes ((op '(#b11010100 #b00001010))))
1306 (emit-byte segment #b11010100)
1307 (emit-byte segment #b00001010)))
1309 ;;; CBW -- Convert Byte to Word. AX <- sign_xtnd(AL)
1310 (define-instruction cbw (segment)
1312 (maybe-emit-operand-size-prefix segment :word)
1313 (emit-byte segment #b10011000)))
1315 ;;; CWDE -- Convert Word To Double Word Extened. EAX <- sign_xtnd(AX)
1316 (define-instruction cwde (segment)
1318 (maybe-emit-operand-size-prefix segment :dword)
1319 (emit-byte segment #b10011000)))
1321 ;;; CWD -- Convert Word to Double Word. DX:AX <- sign_xtnd(AX)
1322 (define-instruction cwd (segment)
1324 (maybe-emit-operand-size-prefix segment :word)
1325 (emit-byte segment #b10011001)))
1327 ;;; CDQ -- Convert Double Word to Quad Word. EDX:EAX <- sign_xtnd(EAX)
1328 (define-instruction cdq (segment)
1329 (:printer byte ((op #b10011001)))
1331 (maybe-emit-operand-size-prefix segment :dword)
1332 (emit-byte segment #b10011001)))
1334 (define-instruction xadd (segment dst src)
1335 ;; Register/Memory with Register.
1336 (:printer ext-reg-reg/mem ((op #b1100000)) '(:name :tab reg/mem ", " reg))
1338 (aver (register-p src))
1339 (let ((size (matching-operand-size src dst)))
1340 (maybe-emit-operand-size-prefix segment size)
1341 (emit-byte segment #b00001111)
1342 (emit-byte segment (if (eq size :byte) #b11000000 #b11000001))
1343 (emit-ea segment dst (reg-tn-encoding src)))))
1348 (defun emit-shift-inst (segment dst amount opcode)
1349 (let ((size (operand-size dst)))
1350 (maybe-emit-operand-size-prefix segment size)
1351 (multiple-value-bind (major-opcode immed)
1353 (:cl (values #b11010010 nil))
1354 (1 (values #b11010000 nil))
1355 (t (values #b11000000 t)))
1357 (if (eq size :byte) major-opcode (logior major-opcode 1)))
1358 (emit-ea segment dst opcode)
1360 (emit-byte segment amount)))))
1362 (eval-when (:compile-toplevel :execute)
1363 (defun shift-inst-printer-list (subop)
1364 `((reg/mem ((op (#b1101000 ,subop)))
1365 (:name :tab reg/mem ", 1"))
1366 (reg/mem ((op (#b1101001 ,subop)))
1367 (:name :tab reg/mem ", " 'cl))
1368 (reg/mem-imm ((op (#b1100000 ,subop))
1369 (imm nil :type signed-imm-byte))))))
1371 (define-instruction rol (segment dst amount)
1373 (shift-inst-printer-list #b000))
1375 (emit-shift-inst segment dst amount #b000)))
1377 (define-instruction ror (segment dst amount)
1379 (shift-inst-printer-list #b001))
1381 (emit-shift-inst segment dst amount #b001)))
1383 (define-instruction rcl (segment dst amount)
1385 (shift-inst-printer-list #b010))
1387 (emit-shift-inst segment dst amount #b010)))
1389 (define-instruction rcr (segment dst amount)
1391 (shift-inst-printer-list #b011))
1393 (emit-shift-inst segment dst amount #b011)))
1395 (define-instruction shl (segment dst amount)
1397 (shift-inst-printer-list #b100))
1399 (emit-shift-inst segment dst amount #b100)))
1401 (define-instruction shr (segment dst amount)
1403 (shift-inst-printer-list #b101))
1405 (emit-shift-inst segment dst amount #b101)))
1407 (define-instruction sar (segment dst amount)
1409 (shift-inst-printer-list #b111))
1411 (emit-shift-inst segment dst amount #b111)))
1413 (defun emit-double-shift (segment opcode dst src amt)
1414 (let ((size (matching-operand-size dst src)))
1415 (when (eq size :byte)
1416 (error "Double shifts can only be used with words."))
1417 (maybe-emit-operand-size-prefix segment size)
1418 (emit-byte segment #b00001111)
1419 (emit-byte segment (dpb opcode (byte 1 3)
1420 (if (eq amt :cl) #b10100101 #b10100100)))
1422 (emit-ea segment dst src)
1423 (emit-ea segment dst (reg-tn-encoding src)) ; pw tries this
1424 (unless (eq amt :cl)
1425 (emit-byte segment amt))))
1427 (eval-when (:compile-toplevel :execute)
1428 (defun double-shift-inst-printer-list (op)
1430 (ext-reg-reg/mem-imm ((op ,(logior op #b100))
1431 (imm nil :type signed-imm-byte)))
1432 (ext-reg-reg/mem ((op ,(logior op #b101)))
1433 (:name :tab reg/mem ", " 'cl)))))
1435 (define-instruction shld (segment dst src amt)
1436 (:declare (type (or (member :cl) (mod 32)) amt))
1437 (:printer-list (double-shift-inst-printer-list #b10100000))
1439 (emit-double-shift segment #b0 dst src amt)))
1441 (define-instruction shrd (segment dst src amt)
1442 (:declare (type (or (member :cl) (mod 32)) amt))
1443 (:printer-list (double-shift-inst-printer-list #b10101000))
1445 (emit-double-shift segment #b1 dst src amt)))
1447 (define-instruction and (segment dst src)
1449 (arith-inst-printer-list #b100))
1451 (emit-random-arith-inst "AND" segment dst src #b100)))
1453 (define-instruction test (segment this that)
1454 (:printer accum-imm ((op #b1010100)))
1455 (:printer reg/mem-imm ((op '(#b1111011 #b000))))
1456 (:printer reg-reg/mem ((op #b1000010)))
1458 (let ((size (matching-operand-size this that)))
1459 (maybe-emit-operand-size-prefix segment size)
1460 (flet ((test-immed-and-something (immed something)
1461 (cond ((accumulator-p something)
1463 (if (eq size :byte) #b10101000 #b10101001))
1464 (emit-sized-immediate segment size immed))
1467 (if (eq size :byte) #b11110110 #b11110111))
1468 (emit-ea segment something #b000)
1469 (emit-sized-immediate segment size immed))))
1470 (test-reg-and-something (reg something)
1471 (emit-byte segment (if (eq size :byte) #b10000100 #b10000101))
1472 (emit-ea segment something (reg-tn-encoding reg))))
1473 (cond ((integerp that)
1474 (test-immed-and-something that this))
1476 (test-immed-and-something this that))
1478 (test-reg-and-something this that))
1480 (test-reg-and-something that this))
1482 (error "bogus operands for TEST: ~S and ~S" this that)))))))
1484 (define-instruction or (segment dst src)
1486 (arith-inst-printer-list #b001))
1488 (emit-random-arith-inst "OR" segment dst src #b001)))
1490 (define-instruction xor (segment dst src)
1492 (arith-inst-printer-list #b110))
1494 (emit-random-arith-inst "XOR" segment dst src #b110)))
1496 (define-instruction not (segment dst)
1497 (:printer reg/mem ((op '(#b1111011 #b010))))
1499 (let ((size (operand-size dst)))
1500 (maybe-emit-operand-size-prefix segment size)
1501 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1502 (emit-ea segment dst #b010))))
1504 ;;;; string manipulation
1506 (define-instruction cmps (segment size)
1507 (:printer string-op ((op #b1010011)))
1509 (maybe-emit-operand-size-prefix segment size)
1510 (emit-byte segment (if (eq size :byte) #b10100110 #b10100111))))
1512 (define-instruction ins (segment acc)
1513 (:printer string-op ((op #b0110110)))
1515 (let ((size (operand-size acc)))
1516 (aver (accumulator-p acc))
1517 (maybe-emit-operand-size-prefix segment size)
1518 (emit-byte segment (if (eq size :byte) #b01101100 #b01101101)))))
1520 (define-instruction lods (segment acc)
1521 (:printer string-op ((op #b1010110)))
1523 (let ((size (operand-size acc)))
1524 (aver (accumulator-p acc))
1525 (maybe-emit-operand-size-prefix segment size)
1526 (emit-byte segment (if (eq size :byte) #b10101100 #b10101101)))))
1528 (define-instruction movs (segment size)
1529 (:printer string-op ((op #b1010010)))
1531 (maybe-emit-operand-size-prefix segment size)
1532 (emit-byte segment (if (eq size :byte) #b10100100 #b10100101))))
1534 (define-instruction outs (segment acc)
1535 (:printer string-op ((op #b0110111)))
1537 (let ((size (operand-size acc)))
1538 (aver (accumulator-p acc))
1539 (maybe-emit-operand-size-prefix segment size)
1540 (emit-byte segment (if (eq size :byte) #b01101110 #b01101111)))))
1542 (define-instruction scas (segment acc)
1543 (:printer string-op ((op #b1010111)))
1545 (let ((size (operand-size acc)))
1546 (aver (accumulator-p acc))
1547 (maybe-emit-operand-size-prefix segment size)
1548 (emit-byte segment (if (eq size :byte) #b10101110 #b10101111)))))
1550 (define-instruction stos (segment acc)
1551 (:printer string-op ((op #b1010101)))
1553 (let ((size (operand-size acc)))
1554 (aver (accumulator-p acc))
1555 (maybe-emit-operand-size-prefix segment size)
1556 (emit-byte segment (if (eq size :byte) #b10101010 #b10101011)))))
1558 (define-instruction xlat (segment)
1559 (:printer byte ((op #b11010111)))
1561 (emit-byte segment #b11010111)))
1563 (define-instruction rep (segment)
1565 (emit-byte segment #b11110010)))
1567 (define-instruction repe (segment)
1568 (:printer byte ((op #b11110011)))
1570 (emit-byte segment #b11110011)))
1572 (define-instruction repne (segment)
1573 (:printer byte ((op #b11110010)))
1575 (emit-byte segment #b11110010)))
1578 ;;;; bit manipulation
1580 (define-instruction bsf (segment dst src)
1582 (let ((size (matching-operand-size dst src)))
1583 (when (eq size :byte)
1584 (error "can't scan bytes: ~S" src))
1585 (maybe-emit-operand-size-prefix segment size)
1586 (emit-byte segment #b00001111)
1587 (emit-byte segment #b10111100)
1588 (emit-ea segment src (reg-tn-encoding dst)))))
1590 (define-instruction bsr (segment dst src)
1592 (let ((size (matching-operand-size dst src)))
1593 (when (eq size :byte)
1594 (error "can't scan bytes: ~S" src))
1595 (maybe-emit-operand-size-prefix segment size)
1596 (emit-byte segment #b00001111)
1597 (emit-byte segment #b10111101)
1598 (emit-ea segment src (reg-tn-encoding dst)))))
1600 (defun emit-bit-test-and-mumble (segment src index opcode)
1601 (let ((size (operand-size src)))
1602 (when (eq size :byte)
1603 (error "can't scan bytes: ~S" src))
1604 (maybe-emit-operand-size-prefix segment size)
1605 (emit-byte segment #b00001111)
1606 (cond ((integerp index)
1607 (emit-byte segment #b10111010)
1608 (emit-ea segment src opcode)
1609 (emit-byte segment index))
1611 (emit-byte segment (dpb opcode (byte 3 3) #b10000011))
1612 (emit-ea segment src (reg-tn-encoding index))))))
1614 (define-instruction bt (segment src index)
1616 (emit-bit-test-and-mumble segment src index #b100)))
1618 (define-instruction btc (segment src index)
1620 (emit-bit-test-and-mumble segment src index #b111)))
1622 (define-instruction btr (segment src index)
1624 (emit-bit-test-and-mumble segment src index #b110)))
1626 (define-instruction bts (segment src index)
1628 (emit-bit-test-and-mumble segment src index #b101)))
1631 ;;;; control transfer
1633 (define-instruction call (segment where)
1634 (:printer near-jump ((op #b11101000)))
1635 (:printer reg/mem ((op '(#b1111111 #b010)) (width 1)))
1639 (emit-byte segment #b11101000)
1640 (emit-back-patch segment
1642 (lambda (segment posn)
1644 (- (label-position where)
1647 (emit-byte segment #b11101000)
1648 (emit-relative-fixup segment where))
1650 (emit-byte segment #b11111111)
1651 (emit-ea segment where #b010)))))
1653 (defun emit-byte-displacement-backpatch (segment target)
1654 (emit-back-patch segment
1656 (lambda (segment posn)
1657 (let ((disp (- (label-position target) (1+ posn))))
1658 (aver (<= -128 disp 127))
1659 (emit-byte segment disp)))))
1661 (define-instruction jmp (segment cond &optional where)
1662 ;; conditional jumps
1663 (:printer short-cond-jump ((op #b0111)) '('j cc :tab label))
1664 (:printer near-cond-jump () '('j cc :tab label))
1665 ;; unconditional jumps
1666 (:printer short-jump ((op #b1011)))
1667 (:printer near-jump ((op #b11101001)) )
1668 (:printer reg/mem ((op '(#b1111111 #b100)) (width 1)))
1673 (lambda (segment posn delta-if-after)
1674 (let ((disp (- (label-position where posn delta-if-after)
1676 (when (<= -128 disp 127)
1678 (dpb (conditional-opcode cond)
1681 (emit-byte-displacement-backpatch segment where)
1683 (lambda (segment posn)
1684 (let ((disp (- (label-position where) (+ posn 6))))
1685 (emit-byte segment #b00001111)
1687 (dpb (conditional-opcode cond)
1690 (emit-dword segment disp)))))
1691 ((label-p (setq where cond))
1694 (lambda (segment posn delta-if-after)
1695 (let ((disp (- (label-position where posn delta-if-after)
1697 (when (<= -128 disp 127)
1698 (emit-byte segment #b11101011)
1699 (emit-byte-displacement-backpatch segment where)
1701 (lambda (segment posn)
1702 (let ((disp (- (label-position where) (+ posn 5))))
1703 (emit-byte segment #b11101001)
1704 (emit-dword segment disp)))))
1706 (emit-byte segment #b11101001)
1707 (emit-relative-fixup segment where))
1709 (unless (or (ea-p where) (tn-p where))
1710 (error "don't know what to do with ~A" where))
1711 (emit-byte segment #b11111111)
1712 (emit-ea segment where #b100)))))
1714 (define-instruction jmp-short (segment label)
1716 (emit-byte segment #b11101011)
1717 (emit-byte-displacement-backpatch segment label)))
1719 (define-instruction ret (segment &optional stack-delta)
1720 (:printer byte ((op #b11000011)))
1721 (:printer byte ((op #b11000010) (imm nil :type 'imm-word-16))
1725 (emit-byte segment #b11000010)
1726 (emit-word segment stack-delta))
1728 (emit-byte segment #b11000011)))))
1730 (define-instruction jecxz (segment target)
1731 (:printer short-jump ((op #b0011)))
1733 (emit-byte segment #b11100011)
1734 (emit-byte-displacement-backpatch segment target)))
1736 (define-instruction loop (segment target)
1737 (:printer short-jump ((op #b0010)))
1739 (emit-byte segment #b11100010) ; pfw this was 11100011, or jecxz!!!!
1740 (emit-byte-displacement-backpatch segment target)))
1742 (define-instruction loopz (segment target)
1743 (:printer short-jump ((op #b0001)))
1745 (emit-byte segment #b11100001)
1746 (emit-byte-displacement-backpatch segment target)))
1748 (define-instruction loopnz (segment target)
1749 (:printer short-jump ((op #b0000)))
1751 (emit-byte segment #b11100000)
1752 (emit-byte-displacement-backpatch segment target)))
1754 ;;;; conditional byte set
1756 (define-instruction set (segment dst cond)
1757 (:printer cond-set ())
1759 (emit-byte segment #b00001111)
1760 (emit-byte segment (dpb (conditional-opcode cond) (byte 4 0) #b10010000))
1761 (emit-ea segment dst #b000)))
1765 (define-instruction enter (segment disp &optional (level 0))
1766 (:declare (type (unsigned-byte 16) disp)
1767 (type (unsigned-byte 8) level))
1768 (:printer enter-format ((op #b11001000)))
1770 (emit-byte segment #b11001000)
1771 (emit-word segment disp)
1772 (emit-byte segment level)))
1774 (define-instruction leave (segment)
1775 (:printer byte ((op #b11001001)))
1777 (emit-byte segment #b11001001)))
1779 ;;;; interrupt instructions
1781 (defun snarf-error-junk (sap offset &optional length-only)
1782 (let* ((length (sb!sys:sap-ref-8 sap offset))
1783 (vector (make-array length :element-type '(unsigned-byte 8))))
1784 (declare (type sb!sys:system-area-pointer sap)
1785 (type (unsigned-byte 8) length)
1786 (type (simple-array (unsigned-byte 8) (*)) vector))
1788 (values 0 (1+ length) nil nil))
1790 (sb!kernel:copy-from-system-area sap (* n-byte-bits (1+ offset))
1791 vector (* n-word-bits
1793 (* length n-byte-bits))
1794 (collect ((sc-offsets)
1796 (lengths 1) ; the length byte
1798 (error-number (sb!c:read-var-integer vector index)))
1801 (when (>= index length)
1803 (let ((old-index index))
1804 (sc-offsets (sb!c:read-var-integer vector index))
1805 (lengths (- index old-index))))
1806 (values error-number
1812 (defmacro break-cases (breaknum &body cases)
1813 (let ((bn-temp (gensym)))
1814 (collect ((clauses))
1815 (dolist (case cases)
1816 (clauses `((= ,bn-temp ,(car case)) ,@(cdr case))))
1817 `(let ((,bn-temp ,breaknum))
1818 (cond ,@(clauses))))))
1821 (defun break-control (chunk inst stream dstate)
1822 (declare (ignore inst))
1823 (flet ((nt (x) (if stream (sb!disassem:note x dstate))))
1824 ;; FIXME: Make sure that BYTE-IMM-CODE is defined. The genesis
1825 ;; map has it undefined; and it should be easier to look in the target
1826 ;; Lisp (with (DESCRIBE 'BYTE-IMM-CODE)) than to definitively deduce
1827 ;; from first principles whether it's defined in some way that genesis
1829 (case (byte-imm-code chunk dstate)
1832 (sb!disassem:handle-break-args #'snarf-error-junk stream dstate))
1835 (sb!disassem:handle-break-args #'snarf-error-junk stream dstate))
1837 (nt "breakpoint trap"))
1838 (#.pending-interrupt-trap
1839 (nt "pending interrupt trap"))
1842 (#.fun-end-breakpoint-trap
1843 (nt "function end breakpoint trap")))))
1845 (define-instruction break (segment code)
1846 (:declare (type (unsigned-byte 8) code))
1847 (:printer byte-imm ((op #b11001100)) '(:name :tab code)
1848 :control #'break-control)
1850 (emit-byte segment #b11001100)
1851 (emit-byte segment code)))
1853 (define-instruction int (segment number)
1854 (:declare (type (unsigned-byte 8) number))
1855 (:printer byte-imm ((op #b11001101)))
1859 (emit-byte segment #b11001100))
1861 (emit-byte segment #b11001101)
1862 (emit-byte segment number)))))
1864 (define-instruction into (segment)
1865 (:printer byte ((op #b11001110)))
1867 (emit-byte segment #b11001110)))
1869 (define-instruction bound (segment reg bounds)
1871 (let ((size (matching-operand-size reg bounds)))
1872 (when (eq size :byte)
1873 (error "can't bounds-test bytes: ~S" reg))
1874 (maybe-emit-operand-size-prefix segment size)
1875 (emit-byte segment #b01100010)
1876 (emit-ea segment bounds (reg-tn-encoding reg)))))
1878 (define-instruction iret (segment)
1879 (:printer byte ((op #b11001111)))
1881 (emit-byte segment #b11001111)))
1883 ;;;; processor control
1885 (define-instruction hlt (segment)
1886 (:printer byte ((op #b11110100)))
1888 (emit-byte segment #b11110100)))
1890 (define-instruction nop (segment)
1891 (:printer byte ((op #b10010000)))
1893 (emit-byte segment #b10010000)))
1895 (define-instruction wait (segment)
1896 (:printer byte ((op #b10011011)))
1898 (emit-byte segment #b10011011)))
1900 (define-instruction lock (segment)
1901 (:printer byte ((op #b11110000)))
1903 (emit-byte segment #b11110000)))
1905 ;;;; miscellaneous hackery
1907 (define-instruction byte (segment byte)
1909 (emit-byte segment byte)))
1911 (define-instruction word (segment word)
1913 (emit-word segment word)))
1915 (define-instruction dword (segment dword)
1917 (emit-dword segment dword)))
1919 (defun emit-header-data (segment type)
1920 (emit-back-patch segment
1922 (lambda (segment posn)
1926 (component-header-length))
1930 (define-instruction simple-fun-header-word (segment)
1932 (emit-header-data segment simple-fun-header-widetag)))
1934 (define-instruction lra-header-word (segment)
1936 (emit-header-data segment return-pc-header-widetag)))
1938 ;;;; fp instructions
1940 ;;;; FIXME: This section said "added by jrd", which should end up in CREDITS.
1942 ;;;; Note: We treat the single-precision and double-precision variants
1943 ;;;; as separate instructions.
1945 ;;; Load single to st(0).
1946 (define-instruction fld (segment source)
1947 (:printer floating-point ((op '(#b001 #b000))))
1949 (emit-byte segment #b11011001)
1950 (emit-fp-op segment source #b000)))
1952 ;;; Load double to st(0).
1953 (define-instruction fldd (segment source)
1954 (:printer floating-point ((op '(#b101 #b000))))
1955 (:printer floating-point-fp ((op '(#b001 #b000))))
1957 (if (fp-reg-tn-p source)
1958 (emit-byte segment #b11011001)
1959 (emit-byte segment #b11011101))
1960 (emit-fp-op segment source #b000)))
1962 ;;; Load long to st(0).
1963 (define-instruction fldl (segment source)
1964 (:printer floating-point ((op '(#b011 #b101))))
1966 (emit-byte segment #b11011011)
1967 (emit-fp-op segment source #b101)))
1969 ;;; Store single from st(0).
1970 (define-instruction fst (segment dest)
1971 (:printer floating-point ((op '(#b001 #b010))))
1973 (cond ((fp-reg-tn-p dest)
1974 (emit-byte segment #b11011101)
1975 (emit-fp-op segment dest #b010))
1977 (emit-byte segment #b11011001)
1978 (emit-fp-op segment dest #b010)))))
1980 ;;; Store double from st(0).
1981 (define-instruction fstd (segment dest)
1982 (:printer floating-point ((op '(#b101 #b010))))
1983 (:printer floating-point-fp ((op '(#b101 #b010))))
1985 (cond ((fp-reg-tn-p dest)
1986 (emit-byte segment #b11011101)
1987 (emit-fp-op segment dest #b010))
1989 (emit-byte segment #b11011101)
1990 (emit-fp-op segment dest #b010)))))
1992 ;;; Arithmetic ops are all done with at least one operand at top of
1993 ;;; stack. The other operand is is another register or a 32/64 bit
1996 ;;; dtc: I've tried to follow the Intel ASM386 conventions, but note
1997 ;;; that these conflict with the Gdb conventions for binops. To reduce
1998 ;;; the confusion I've added comments showing the mathamatical
1999 ;;; operation and the two syntaxes. By the ASM386 convention the
2000 ;;; instruction syntax is:
2003 ;;; or Fop Destination, Source
2005 ;;; If only one operand is given then it is the source and the
2006 ;;; destination is ST(0). There are reversed forms of the fsub and
2007 ;;; fdiv instructions inducated by an 'R' suffix.
2009 ;;; The mathematical operation for the non-reverse form is always:
2010 ;;; destination = destination op source
2012 ;;; For the reversed form it is:
2013 ;;; destination = source op destination
2015 ;;; The instructions below only accept one operand at present which is
2016 ;;; usually the source. I've hack in extra instructions to implement
2017 ;;; the fops with a ST(i) destination, these have a -sti suffix and
2018 ;;; the operand is the destination with the source being ST(0).
2021 ;;; st(0) = st(0) + memory or st(i).
2022 (define-instruction fadd (segment source)
2023 (:printer floating-point ((op '(#b000 #b000))))
2025 (emit-byte segment #b11011000)
2026 (emit-fp-op segment source #b000)))
2029 ;;; st(0) = st(0) + memory or st(i).
2030 (define-instruction faddd (segment source)
2031 (:printer floating-point ((op '(#b100 #b000))))
2032 (:printer floating-point-fp ((op '(#b000 #b000))))
2034 (if (fp-reg-tn-p source)
2035 (emit-byte segment #b11011000)
2036 (emit-byte segment #b11011100))
2037 (emit-fp-op segment source #b000)))
2039 ;;; Add double destination st(i):
2040 ;;; st(i) = st(0) + st(i).
2041 (define-instruction fadd-sti (segment destination)
2042 (:printer floating-point-fp ((op '(#b100 #b000))))
2044 (aver (fp-reg-tn-p destination))
2045 (emit-byte segment #b11011100)
2046 (emit-fp-op segment destination #b000)))
2048 (define-instruction faddp-sti (segment destination)
2049 (:printer floating-point-fp ((op '(#b110 #b000))))
2051 (aver (fp-reg-tn-p destination))
2052 (emit-byte segment #b11011110)
2053 (emit-fp-op segment destination #b000)))
2055 ;;; Subtract single:
2056 ;;; st(0) = st(0) - memory or st(i).
2057 (define-instruction fsub (segment source)
2058 (:printer floating-point ((op '(#b000 #b100))))
2060 (emit-byte segment #b11011000)
2061 (emit-fp-op segment source #b100)))
2063 ;;; Subtract single, reverse:
2064 ;;; st(0) = memory or st(i) - st(0).
2065 (define-instruction fsubr (segment source)
2066 (:printer floating-point ((op '(#b000 #b101))))
2068 (emit-byte segment #b11011000)
2069 (emit-fp-op segment source #b101)))
2071 ;;; Subtract double:
2072 ;;; st(0) = st(0) - memory or st(i).
2073 (define-instruction fsubd (segment source)
2074 (:printer floating-point ((op '(#b100 #b100))))
2075 (:printer floating-point-fp ((op '(#b000 #b100))))
2077 (if (fp-reg-tn-p source)
2078 (emit-byte segment #b11011000)
2079 (emit-byte segment #b11011100))
2080 (emit-fp-op segment source #b100)))
2082 ;;; Subtract double, reverse:
2083 ;;; st(0) = memory or st(i) - st(0).
2084 (define-instruction fsubrd (segment source)
2085 (:printer floating-point ((op '(#b100 #b101))))
2086 (:printer floating-point-fp ((op '(#b000 #b101))))
2088 (if (fp-reg-tn-p source)
2089 (emit-byte segment #b11011000)
2090 (emit-byte segment #b11011100))
2091 (emit-fp-op segment source #b101)))
2093 ;;; Subtract double, destination st(i):
2094 ;;; st(i) = st(i) - st(0).
2096 ;;; ASM386 syntax: FSUB ST(i), ST
2097 ;;; Gdb syntax: fsubr %st,%st(i)
2098 (define-instruction fsub-sti (segment destination)
2099 (:printer floating-point-fp ((op '(#b100 #b101))))
2101 (aver (fp-reg-tn-p destination))
2102 (emit-byte segment #b11011100)
2103 (emit-fp-op segment destination #b101)))
2105 (define-instruction fsubp-sti (segment destination)
2106 (:printer floating-point-fp ((op '(#b110 #b101))))
2108 (aver (fp-reg-tn-p destination))
2109 (emit-byte segment #b11011110)
2110 (emit-fp-op segment destination #b101)))
2112 ;;; Subtract double, reverse, destination st(i):
2113 ;;; st(i) = st(0) - st(i).
2115 ;;; ASM386 syntax: FSUBR ST(i), ST
2116 ;;; Gdb syntax: fsub %st,%st(i)
2117 (define-instruction fsubr-sti (segment destination)
2118 (:printer floating-point-fp ((op '(#b100 #b100))))
2120 (aver (fp-reg-tn-p destination))
2121 (emit-byte segment #b11011100)
2122 (emit-fp-op segment destination #b100)))
2124 (define-instruction fsubrp-sti (segment destination)
2125 (:printer floating-point-fp ((op '(#b110 #b100))))
2127 (aver (fp-reg-tn-p destination))
2128 (emit-byte segment #b11011110)
2129 (emit-fp-op segment destination #b100)))
2131 ;;; Multiply single:
2132 ;;; st(0) = st(0) * memory or st(i).
2133 (define-instruction fmul (segment source)
2134 (:printer floating-point ((op '(#b000 #b001))))
2136 (emit-byte segment #b11011000)
2137 (emit-fp-op segment source #b001)))
2139 ;;; Multiply double:
2140 ;;; st(0) = st(0) * memory or st(i).
2141 (define-instruction fmuld (segment source)
2142 (:printer floating-point ((op '(#b100 #b001))))
2143 (:printer floating-point-fp ((op '(#b000 #b001))))
2145 (if (fp-reg-tn-p source)
2146 (emit-byte segment #b11011000)
2147 (emit-byte segment #b11011100))
2148 (emit-fp-op segment source #b001)))
2150 ;;; Multiply double, destination st(i):
2151 ;;; st(i) = st(i) * st(0).
2152 (define-instruction fmul-sti (segment destination)
2153 (:printer floating-point-fp ((op '(#b100 #b001))))
2155 (aver (fp-reg-tn-p destination))
2156 (emit-byte segment #b11011100)
2157 (emit-fp-op segment destination #b001)))
2160 ;;; st(0) = st(0) / memory or st(i).
2161 (define-instruction fdiv (segment source)
2162 (:printer floating-point ((op '(#b000 #b110))))
2164 (emit-byte segment #b11011000)
2165 (emit-fp-op segment source #b110)))
2167 ;;; Divide single, reverse:
2168 ;;; st(0) = memory or st(i) / st(0).
2169 (define-instruction fdivr (segment source)
2170 (:printer floating-point ((op '(#b000 #b111))))
2172 (emit-byte segment #b11011000)
2173 (emit-fp-op segment source #b111)))
2176 ;;; st(0) = st(0) / memory or st(i).
2177 (define-instruction fdivd (segment source)
2178 (:printer floating-point ((op '(#b100 #b110))))
2179 (:printer floating-point-fp ((op '(#b000 #b110))))
2181 (if (fp-reg-tn-p source)
2182 (emit-byte segment #b11011000)
2183 (emit-byte segment #b11011100))
2184 (emit-fp-op segment source #b110)))
2186 ;;; Divide double, reverse:
2187 ;;; st(0) = memory or st(i) / st(0).
2188 (define-instruction fdivrd (segment source)
2189 (:printer floating-point ((op '(#b100 #b111))))
2190 (:printer floating-point-fp ((op '(#b000 #b111))))
2192 (if (fp-reg-tn-p source)
2193 (emit-byte segment #b11011000)
2194 (emit-byte segment #b11011100))
2195 (emit-fp-op segment source #b111)))
2197 ;;; Divide double, destination st(i):
2198 ;;; st(i) = st(i) / st(0).
2200 ;;; ASM386 syntax: FDIV ST(i), ST
2201 ;;; Gdb syntax: fdivr %st,%st(i)
2202 (define-instruction fdiv-sti (segment destination)
2203 (:printer floating-point-fp ((op '(#b100 #b111))))
2205 (aver (fp-reg-tn-p destination))
2206 (emit-byte segment #b11011100)
2207 (emit-fp-op segment destination #b111)))
2209 ;;; Divide double, reverse, destination st(i):
2210 ;;; st(i) = st(0) / st(i).
2212 ;;; ASM386 syntax: FDIVR ST(i), ST
2213 ;;; Gdb syntax: fdiv %st,%st(i)
2214 (define-instruction fdivr-sti (segment destination)
2215 (:printer floating-point-fp ((op '(#b100 #b110))))
2217 (aver (fp-reg-tn-p destination))
2218 (emit-byte segment #b11011100)
2219 (emit-fp-op segment destination #b110)))
2221 ;;; Exchange fr0 with fr(n). (There is no double precision variant.)
2222 (define-instruction fxch (segment source)
2223 (:printer floating-point-fp ((op '(#b001 #b001))))
2225 (unless (and (tn-p source)
2226 (eq (sb-name (sc-sb (tn-sc source))) 'float-registers))
2228 (emit-byte segment #b11011001)
2229 (emit-fp-op segment source #b001)))
2231 ;;; Push 32-bit integer to st0.
2232 (define-instruction fild (segment source)
2233 (:printer floating-point ((op '(#b011 #b000))))
2235 (emit-byte segment #b11011011)
2236 (emit-fp-op segment source #b000)))
2238 ;;; Push 64-bit integer to st0.
2239 (define-instruction fildl (segment source)
2240 (:printer floating-point ((op '(#b111 #b101))))
2242 (emit-byte segment #b11011111)
2243 (emit-fp-op segment source #b101)))
2245 ;;; Store 32-bit integer.
2246 (define-instruction fist (segment dest)
2247 (:printer floating-point ((op '(#b011 #b010))))
2249 (emit-byte segment #b11011011)
2250 (emit-fp-op segment dest #b010)))
2252 ;;; Store and pop 32-bit integer.
2253 (define-instruction fistp (segment dest)
2254 (:printer floating-point ((op '(#b011 #b011))))
2256 (emit-byte segment #b11011011)
2257 (emit-fp-op segment dest #b011)))
2259 ;;; Store and pop 64-bit integer.
2260 (define-instruction fistpl (segment dest)
2261 (:printer floating-point ((op '(#b111 #b111))))
2263 (emit-byte segment #b11011111)
2264 (emit-fp-op segment dest #b111)))
2266 ;;; Store single from st(0) and pop.
2267 (define-instruction fstp (segment dest)
2268 (:printer floating-point ((op '(#b001 #b011))))
2270 (cond ((fp-reg-tn-p dest)
2271 (emit-byte segment #b11011101)
2272 (emit-fp-op segment dest #b011))
2274 (emit-byte segment #b11011001)
2275 (emit-fp-op segment dest #b011)))))
2277 ;;; Store double from st(0) and pop.
2278 (define-instruction fstpd (segment dest)
2279 (:printer floating-point ((op '(#b101 #b011))))
2280 (:printer floating-point-fp ((op '(#b101 #b011))))
2282 (cond ((fp-reg-tn-p dest)
2283 (emit-byte segment #b11011101)
2284 (emit-fp-op segment dest #b011))
2286 (emit-byte segment #b11011101)
2287 (emit-fp-op segment dest #b011)))))
2289 ;;; Store long from st(0) and pop.
2290 (define-instruction fstpl (segment dest)
2291 (:printer floating-point ((op '(#b011 #b111))))
2293 (emit-byte segment #b11011011)
2294 (emit-fp-op segment dest #b111)))
2296 ;;; Decrement stack-top pointer.
2297 (define-instruction fdecstp (segment)
2298 (:printer floating-point-no ((op #b10110)))
2300 (emit-byte segment #b11011001)
2301 (emit-byte segment #b11110110)))
2303 ;;; Increment stack-top pointer.
2304 (define-instruction fincstp (segment)
2305 (:printer floating-point-no ((op #b10111)))
2307 (emit-byte segment #b11011001)
2308 (emit-byte segment #b11110111)))
2310 ;;; Free fp register.
2311 (define-instruction ffree (segment dest)
2312 (:printer floating-point-fp ((op '(#b101 #b000))))
2314 (emit-byte segment #b11011101)
2315 (emit-fp-op segment dest #b000)))
2317 (define-instruction fabs (segment)
2318 (:printer floating-point-no ((op #b00001)))
2320 (emit-byte segment #b11011001)
2321 (emit-byte segment #b11100001)))
2323 (define-instruction fchs (segment)
2324 (:printer floating-point-no ((op #b00000)))
2326 (emit-byte segment #b11011001)
2327 (emit-byte segment #b11100000)))
2329 (define-instruction frndint(segment)
2330 (:printer floating-point-no ((op #b11100)))
2332 (emit-byte segment #b11011001)
2333 (emit-byte segment #b11111100)))
2336 (define-instruction fninit(segment)
2337 (:printer floating-point-5 ((op #b00011)))
2339 (emit-byte segment #b11011011)
2340 (emit-byte segment #b11100011)))
2342 ;;; Store Status Word to AX.
2343 (define-instruction fnstsw(segment)
2344 (:printer floating-point-st ((op #b00000)))
2346 (emit-byte segment #b11011111)
2347 (emit-byte segment #b11100000)))
2349 ;;; Load Control Word.
2351 ;;; src must be a memory location
2352 (define-instruction fldcw(segment src)
2353 (:printer floating-point ((op '(#b001 #b101))))
2355 (emit-byte segment #b11011001)
2356 (emit-fp-op segment src #b101)))
2358 ;;; Store Control Word.
2359 (define-instruction fnstcw(segment dst)
2360 (:printer floating-point ((op '(#b001 #b111))))
2362 (emit-byte segment #b11011001)
2363 (emit-fp-op segment dst #b111)))
2365 ;;; Store FP Environment.
2366 (define-instruction fstenv(segment dst)
2367 (:printer floating-point ((op '(#b001 #b110))))
2369 (emit-byte segment #b11011001)
2370 (emit-fp-op segment dst #b110)))
2372 ;;; Restore FP Environment.
2373 (define-instruction fldenv(segment src)
2374 (:printer floating-point ((op '(#b001 #b100))))
2376 (emit-byte segment #b11011001)
2377 (emit-fp-op segment src #b100)))
2380 (define-instruction fsave(segment dst)
2381 (:printer floating-point ((op '(#b101 #b110))))
2383 (emit-byte segment #b11011101)
2384 (emit-fp-op segment dst #b110)))
2386 ;;; Restore FP State.
2387 (define-instruction frstor(segment src)
2388 (:printer floating-point ((op '(#b101 #b100))))
2390 (emit-byte segment #b11011101)
2391 (emit-fp-op segment src #b100)))
2393 ;;; Clear exceptions.
2394 (define-instruction fnclex(segment)
2395 (:printer floating-point-5 ((op #b00010)))
2397 (emit-byte segment #b11011011)
2398 (emit-byte segment #b11100010)))
2401 (define-instruction fcom (segment src)
2402 (:printer floating-point ((op '(#b000 #b010))))
2404 (emit-byte segment #b11011000)
2405 (emit-fp-op segment src #b010)))
2407 (define-instruction fcomd (segment src)
2408 (:printer floating-point ((op '(#b100 #b010))))
2409 (:printer floating-point-fp ((op '(#b000 #b010))))
2411 (if (fp-reg-tn-p src)
2412 (emit-byte segment #b11011000)
2413 (emit-byte segment #b11011100))
2414 (emit-fp-op segment src #b010)))
2416 ;;; Compare ST1 to ST0, popping the stack twice.
2417 (define-instruction fcompp (segment)
2418 (:printer floating-point-3 ((op '(#b110 #b011001))))
2420 (emit-byte segment #b11011110)
2421 (emit-byte segment #b11011001)))
2423 ;;; unordered comparison
2424 (define-instruction fucom (segment src)
2425 ;; XX Printer conflicts with frstor
2426 ;; (:printer floating-point ((op '(#b101 #b100))))
2428 (aver (fp-reg-tn-p src))
2429 (emit-byte segment #b11011101)
2430 (emit-fp-op segment src #b100)))
2432 (define-instruction ftst (segment)
2433 (:printer floating-point-no ((op #b00100)))
2435 (emit-byte segment #b11011001)
2436 (emit-byte segment #b11100100)))
2440 (define-instruction fsqrt(segment)
2441 (:printer floating-point-no ((op #b11010)))
2443 (emit-byte segment #b11011001)
2444 (emit-byte segment #b11111010)))
2446 (define-instruction fscale(segment)
2447 (:printer floating-point-no ((op #b11101)))
2449 (emit-byte segment #b11011001)
2450 (emit-byte segment #b11111101)))
2452 (define-instruction fxtract(segment)
2453 (:printer floating-point-no ((op #b10100)))
2455 (emit-byte segment #b11011001)
2456 (emit-byte segment #b11110100)))
2458 (define-instruction fsin(segment)
2459 (:printer floating-point-no ((op #b11110)))
2461 (emit-byte segment #b11011001)
2462 (emit-byte segment #b11111110)))
2464 (define-instruction fcos(segment)
2465 (:printer floating-point-no ((op #b11111)))
2467 (emit-byte segment #b11011001)
2468 (emit-byte segment #b11111111)))
2470 (define-instruction fprem1(segment)
2471 (:printer floating-point-no ((op #b10101)))
2473 (emit-byte segment #b11011001)
2474 (emit-byte segment #b11110101)))
2476 (define-instruction fprem(segment)
2477 (:printer floating-point-no ((op #b11000)))
2479 (emit-byte segment #b11011001)
2480 (emit-byte segment #b11111000)))
2482 (define-instruction fxam (segment)
2483 (:printer floating-point-no ((op #b00101)))
2485 (emit-byte segment #b11011001)
2486 (emit-byte segment #b11100101)))
2488 ;;; These do push/pop to stack and need special handling
2489 ;;; in any VOPs that use them. See the book.
2491 ;;; st0 <- st1*log2(st0)
2492 (define-instruction fyl2x(segment) ; pops stack
2493 (:printer floating-point-no ((op #b10001)))
2495 (emit-byte segment #b11011001)
2496 (emit-byte segment #b11110001)))
2498 (define-instruction fyl2xp1(segment)
2499 (:printer floating-point-no ((op #b11001)))
2501 (emit-byte segment #b11011001)
2502 (emit-byte segment #b11111001)))
2504 (define-instruction f2xm1(segment)
2505 (:printer floating-point-no ((op #b10000)))
2507 (emit-byte segment #b11011001)
2508 (emit-byte segment #b11110000)))
2510 (define-instruction fptan(segment) ; st(0) <- 1; st(1) <- tan
2511 (:printer floating-point-no ((op #b10010)))
2513 (emit-byte segment #b11011001)
2514 (emit-byte segment #b11110010)))
2516 (define-instruction fpatan(segment) ; POPS STACK
2517 (:printer floating-point-no ((op #b10011)))
2519 (emit-byte segment #b11011001)
2520 (emit-byte segment #b11110011)))
2522 ;;;; loading constants
2524 (define-instruction fldz(segment)
2525 (:printer floating-point-no ((op #b01110)))
2527 (emit-byte segment #b11011001)
2528 (emit-byte segment #b11101110)))
2530 (define-instruction fld1(segment)
2531 (:printer floating-point-no ((op #b01000)))
2533 (emit-byte segment #b11011001)
2534 (emit-byte segment #b11101000)))
2536 (define-instruction fldpi(segment)
2537 (:printer floating-point-no ((op #b01011)))
2539 (emit-byte segment #b11011001)
2540 (emit-byte segment #b11101011)))
2542 (define-instruction fldl2t(segment)
2543 (:printer floating-point-no ((op #b01001)))
2545 (emit-byte segment #b11011001)
2546 (emit-byte segment #b11101001)))
2548 (define-instruction fldl2e(segment)
2549 (:printer floating-point-no ((op #b01010)))
2551 (emit-byte segment #b11011001)
2552 (emit-byte segment #b11101010)))
2554 (define-instruction fldlg2(segment)
2555 (:printer floating-point-no ((op #b01100)))
2557 (emit-byte segment #b11011001)
2558 (emit-byte segment #b11101100)))
2560 (define-instruction fldln2(segment)
2561 (:printer floating-point-no ((op #b01101)))
2563 (emit-byte segment #b11011001)
2564 (emit-byte segment #b11101101)))