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 ;;; FIXME: In CMU CL, the code in this file seems to be fully
19 ;;; compiled, not byte compiled. I'm not sure that's reasonable:
20 ;;; there's a lot of code in this file, and considering the overall
21 ;;; speed of the compiler, having some byte-interpretation overhead
22 ;;; for every few bytes emitted doesn't seem likely to be noticeable.
23 ;;; I'd like to see what happens if I come back and byte-compile this
26 ;;; Note: In CMU CL, this used to be a call to SET-DISASSEM-PARAMS.
27 (setf sb!disassem:*disassem-inst-alignment-bytes* 1)
29 (deftype reg () '(unsigned-byte 3))
31 (eval-when (#-sb-xc :compile-toplevel :load-toplevel :execute)
33 (defun offset-next (value dstate)
34 (declare (type integer value)
35 (type sb!disassem:disassem-state dstate))
36 (+ (sb!disassem:dstate-next-addr dstate) value))
38 (defparameter *default-address-size*
39 ;; Actually, :DWORD is the only one really supported.
42 (defparameter *byte-reg-names*
43 #(al cl dl bl ah ch dh bh))
44 (defparameter *word-reg-names*
45 #(ax cx dx bx sp bp si di))
46 (defparameter *dword-reg-names*
47 #(eax ecx edx ebx esp ebp esi edi))
49 (defun print-reg-with-width (value width stream dstate)
50 (declare (ignore dstate))
51 (princ (aref (ecase width
52 (:byte *byte-reg-names*)
53 (:word *word-reg-names*)
54 (:dword *dword-reg-names*))
57 ;; XXX plus should do some source-var notes
60 (defun print-reg (value stream dstate)
61 (declare (type reg value)
63 (type sb!disassem:disassem-state dstate))
64 (print-reg-with-width value
65 (sb!disassem:dstate-get-prop dstate 'width)
69 (defun print-word-reg (value stream dstate)
70 (declare (type reg value)
72 (type sb!disassem:disassem-state dstate))
73 (print-reg-with-width value
74 (or (sb!disassem:dstate-get-prop dstate 'word-width)
75 +default-operand-size+)
79 (defun print-byte-reg (value stream dstate)
80 (declare (type reg value)
82 (type sb!disassem:disassem-state dstate))
83 (print-reg-with-width value :byte stream dstate))
85 (defun print-addr-reg (value stream dstate)
86 (declare (type reg value)
88 (type sb!disassem:disassem-state dstate))
89 (print-reg-with-width value *default-address-size* stream dstate))
91 (defun print-reg/mem (value stream dstate)
92 (declare (type (or list reg) value)
94 (type sb!disassem:disassem-state dstate))
95 (if (typep value 'reg)
96 (print-reg value stream dstate)
97 (print-mem-access value stream nil dstate)))
99 ;; Same as print-reg/mem, but prints an explicit size indicator for
100 ;; memory references.
101 (defun print-sized-reg/mem (value stream dstate)
102 (declare (type (or list reg) value)
104 (type sb!disassem:disassem-state dstate))
105 (if (typep value 'reg)
106 (print-reg value stream dstate)
107 (print-mem-access value stream t dstate)))
109 (defun print-byte-reg/mem (value stream dstate)
110 (declare (type (or list reg) value)
112 (type sb!disassem:disassem-state dstate))
113 (if (typep value 'reg)
114 (print-byte-reg value stream dstate)
115 (print-mem-access value stream t dstate)))
117 (defun print-label (value stream dstate)
118 (declare (ignore dstate))
119 (sb!disassem:princ16 value stream))
121 ;;; Returns either an integer, meaning a register, or a list of
122 ;;; (BASE-REG OFFSET INDEX-REG INDEX-SCALE), where any component
123 ;;; may be missing or nil to indicate that it's not used or has the
124 ;;; obvious default value (e.g., 1 for the index-scale).
125 (defun prefilter-reg/mem (value dstate)
126 (declare (type list value)
127 (type sb!disassem:disassem-state dstate))
128 (let ((mod (car value))
130 (declare (type (unsigned-byte 2) mod)
131 (type (unsigned-byte 3) r/m))
137 (let ((sib (sb!disassem:read-suffix 8 dstate)))
138 (declare (type (unsigned-byte 8) sib))
139 (let ((base-reg (ldb (byte 3 0) sib))
140 (index-reg (ldb (byte 3 3) sib))
141 (index-scale (ldb (byte 2 6) sib)))
142 (declare (type (unsigned-byte 3) base-reg index-reg)
143 (type (unsigned-byte 2) index-scale))
147 (if (= base-reg #b101)
148 (sb!disassem:read-signed-suffix 32 dstate)
151 (sb!disassem:read-signed-suffix 8 dstate))
153 (sb!disassem:read-signed-suffix 32 dstate)))))
154 (list (if (and (= mod #b00) (= base-reg #b101)) nil base-reg)
156 (if (= index-reg #b100) nil index-reg)
157 (ash 1 index-scale))))))
158 ((and (= mod #b00) (= r/m #b101))
159 (list nil (sb!disassem:read-signed-suffix 32 dstate)) )
163 (list r/m (sb!disassem:read-signed-suffix 8 dstate)))
165 (list r/m (sb!disassem:read-signed-suffix 32 dstate))))))
168 ;;; This is a sort of bogus prefilter that just stores the info globally for
169 ;;; other people to use; it probably never gets printed.
170 (defun prefilter-width (value dstate)
171 (setf (sb!disassem:dstate-get-prop dstate 'width)
175 ;; set by a prefix instruction
176 (or (sb!disassem:dstate-get-prop dstate 'word-width)
177 +default-operand-size+)))
178 (when (not (eql word-width +default-operand-size+))
180 (setf (sb!disassem:dstate-get-prop dstate 'word-width)
181 +default-operand-size+))
184 (defun read-address (value dstate)
185 (declare (ignore value)) ; always nil anyway
186 (sb!disassem:read-suffix (width-bits *default-address-size*) dstate))
188 (defun width-bits (width)
198 ;;;; disassembler argument types
200 (sb!disassem:define-argument-type displacement
202 :use-label #'offset-next)
204 (sb!disassem:define-argument-type accum
205 :printer #'(lambda (value stream dstate)
206 (declare (ignore value)
208 (type sb!disassem:disassem-state dstate))
209 (print-reg 0 stream dstate))
212 (sb!disassem:define-argument-type word-accum
213 :printer #'(lambda (value stream dstate)
214 (declare (ignore value)
216 (type sb!disassem:disassem-state dstate))
217 (print-word-reg 0 stream dstate)))
219 (sb!disassem:define-argument-type reg
220 :printer #'print-reg)
222 (sb!disassem:define-argument-type addr-reg
223 :printer #'print-addr-reg)
225 (sb!disassem:define-argument-type word-reg
226 :printer #'print-word-reg)
228 (sb!disassem:define-argument-type imm-addr
229 :prefilter #'read-address
230 :printer #'print-label)
232 (sb!disassem:define-argument-type imm-data
233 :prefilter #'(lambda (value dstate)
234 (declare (ignore value)) ; always nil anyway
235 (sb!disassem:read-suffix
236 (width-bits (sb!disassem:dstate-get-prop dstate 'width))
240 (sb!disassem:define-argument-type signed-imm-data
241 :prefilter #'(lambda (value dstate)
242 (declare (ignore value)) ; always nil anyway
243 (let ((width (sb!disassem:dstate-get-prop dstate 'width)))
244 (sb!disassem:read-signed-suffix (width-bits width) dstate)))
247 (sb!disassem:define-argument-type signed-imm-byte
248 :prefilter #'(lambda (value dstate)
249 (declare (ignore value)) ; always nil anyway
250 (sb!disassem:read-signed-suffix 8 dstate)))
252 (sb!disassem:define-argument-type signed-imm-dword
253 :prefilter #'(lambda (value dstate)
254 (declare (ignore value)) ; always nil anyway
255 (sb!disassem:read-signed-suffix 32 dstate)))
257 (sb!disassem:define-argument-type imm-word
258 :prefilter #'(lambda (value dstate)
259 (declare (ignore value)) ; always nil anyway
261 (or (sb!disassem:dstate-get-prop dstate 'word-width)
262 +default-operand-size+)))
263 (sb!disassem:read-suffix (width-bits width) dstate))))
265 ;;; needed for the ret imm16 instruction
266 (sb!disassem:define-argument-type imm-word-16
267 :prefilter #'(lambda (value dstate)
268 (declare (ignore value)) ; always nil anyway
269 (sb!disassem:read-suffix 16 dstate)))
271 (sb!disassem:define-argument-type reg/mem
272 :prefilter #'prefilter-reg/mem
273 :printer #'print-reg/mem)
274 (sb!disassem:define-argument-type sized-reg/mem
275 ;; Same as reg/mem, but prints an explicit size indicator for
276 ;; memory references.
277 :prefilter #'prefilter-reg/mem
278 :printer #'print-sized-reg/mem)
279 (sb!disassem:define-argument-type byte-reg/mem
280 :prefilter #'prefilter-reg/mem
281 :printer #'print-byte-reg/mem)
284 (eval-when (:compile-toplevel :load-toplevel :execute)
285 (defun print-fp-reg (value stream dstate)
286 (declare (ignore dstate))
287 (format stream "FR~D" value))
288 (defun prefilter-fp-reg (value dstate)
290 (declare (ignore dstate))
293 (sb!disassem:define-argument-type fp-reg
294 :prefilter #'prefilter-fp-reg
295 :printer #'print-fp-reg)
297 (sb!disassem:define-argument-type width
298 :prefilter #'prefilter-width
299 :printer #'(lambda (value stream dstate)
302 (and (numberp value) (zerop value))) ; zzz jrd
305 ;; set by a prefix instruction
306 (or (sb!disassem:dstate-get-prop dstate 'word-width)
307 +default-operand-size+)))
308 (princ (schar (symbol-name word-width) 0) stream)))))
310 (eval-when (:compile-toplevel :load-toplevel :execute)
311 (defparameter *conditions*
314 (:b . 2) (:nae . 2) (:c . 2)
315 (:nb . 3) (:ae . 3) (:nc . 3)
316 (:eq . 4) (:e . 4) (:z . 4)
323 (:np . 11) (:po . 11)
324 (:l . 12) (:nge . 12)
325 (:nl . 13) (:ge . 13)
326 (:le . 14) (:ng . 14)
327 (:nle . 15) (:g . 15)))
328 (defparameter *condition-name-vec*
329 (let ((vec (make-array 16 :initial-element nil)))
330 (dolist (cond *conditions*)
331 (when (null (aref vec (cdr cond)))
332 (setf (aref vec (cdr cond)) (car cond))))
336 ;;; Set assembler parameters. (In CMU CL, this was done with
337 ;;; a call to a macro DEF-ASSEMBLER-PARAMS.)
338 (eval-when (:compile-toplevel :load-toplevel :execute)
339 (setf sb!assem:*assem-scheduler-p* nil))
341 (sb!disassem:define-argument-type condition-code
342 :printer *condition-name-vec*)
344 (defun conditional-opcode (condition)
345 (cdr (assoc condition *conditions* :test #'eq)))
347 ;;;; disassembler instruction formats
349 (eval-when (:compile-toplevel :execute)
350 (defun swap-if (direction field1 separator field2)
351 `(:if (,direction :constant 0)
352 (,field1 ,separator ,field2)
353 (,field2 ,separator ,field1))))
355 (sb!disassem:define-instruction-format (byte 8 :default-printer '(:name))
356 (op :field (byte 8 0))
361 (sb!disassem:define-instruction-format (simple 8)
362 (op :field (byte 7 1))
363 (width :field (byte 1 0) :type 'width)
368 ;;; Same as simple, but with direction bit
369 (sb!disassem:define-instruction-format (simple-dir 8 :include 'simple)
370 (op :field (byte 6 2))
371 (dir :field (byte 1 1)))
373 ;;; Same as simple, but with the immediate value occurring by default,
374 ;;; and with an appropiate printer.
375 (sb!disassem:define-instruction-format (accum-imm 8
377 :default-printer '(:name
378 :tab accum ", " imm))
379 (imm :type 'imm-data))
381 (sb!disassem:define-instruction-format (reg-no-width 8
382 :default-printer '(:name :tab reg))
383 (op :field (byte 5 3))
384 (reg :field (byte 3 0) :type 'word-reg)
386 (accum :type 'word-accum)
389 ;;; adds a width field to reg-no-width
390 (sb!disassem:define-instruction-format (reg 8
391 :default-printer '(:name :tab reg))
392 (op :field (byte 4 4))
393 (width :field (byte 1 3) :type 'width)
394 (reg :field (byte 3 0) :type 'reg)
400 ;;; Same as reg, but with direction bit
401 (sb!disassem:define-instruction-format (reg-dir 8 :include 'reg)
402 (op :field (byte 3 5))
403 (dir :field (byte 1 4)))
405 (sb!disassem:define-instruction-format (two-bytes 16
406 :default-printer '(:name))
407 (op :fields (list (byte 8 0) (byte 8 8))))
409 (sb!disassem:define-instruction-format (reg-reg/mem 16
411 `(:name :tab reg ", " reg/mem))
412 (op :field (byte 7 1))
413 (width :field (byte 1 0) :type 'width)
414 (reg/mem :fields (list (byte 2 14) (byte 3 8))
416 (reg :field (byte 3 11) :type 'reg)
420 ;;; same as reg-reg/mem, but with direction bit
421 (sb!disassem:define-instruction-format (reg-reg/mem-dir 16
422 :include 'reg-reg/mem
426 ,(swap-if 'dir 'reg/mem ", " 'reg)))
427 (op :field (byte 6 2))
428 (dir :field (byte 1 1)))
430 ;;; Same as reg-rem/mem, but uses the reg field as a second op code.
431 (sb!disassem:define-instruction-format (reg/mem 16
432 :default-printer '(:name :tab reg/mem))
433 (op :fields (list (byte 7 1) (byte 3 11)))
434 (width :field (byte 1 0) :type 'width)
435 (reg/mem :fields (list (byte 2 14) (byte 3 8))
436 :type 'sized-reg/mem)
440 ;;; Same as reg/mem, but with the immediate value occurring by default,
441 ;;; and with an appropiate printer.
442 (sb!disassem:define-instruction-format (reg/mem-imm 16
445 '(:name :tab reg/mem ", " imm))
446 (reg/mem :type 'sized-reg/mem)
447 (imm :type 'imm-data))
449 ;;; Same as reg/mem, but with using the accumulator in the default printer
450 (sb!disassem:define-instruction-format
452 :include 'reg/mem :default-printer '(:name :tab accum ", " reg/mem))
453 (reg/mem :type 'reg/mem) ; don't need a size
454 (accum :type 'accum))
456 ;;; Same as reg-reg/mem, but with a prefix of #b00001111
457 (sb!disassem:define-instruction-format (ext-reg-reg/mem 24
459 `(:name :tab reg ", " reg/mem))
460 (prefix :field (byte 8 0) :value #b00001111)
461 (op :field (byte 7 9))
462 (width :field (byte 1 8) :type 'width)
463 (reg/mem :fields (list (byte 2 22) (byte 3 16))
465 (reg :field (byte 3 19) :type 'reg)
469 ;;; Same as reg/mem, but with a prefix of #b00001111
470 (sb!disassem:define-instruction-format (ext-reg/mem 24
471 :default-printer '(:name :tab reg/mem))
472 (prefix :field (byte 8 0) :value #b00001111)
473 (op :fields (list (byte 7 9) (byte 3 19)))
474 (width :field (byte 1 8) :type 'width)
475 (reg/mem :fields (list (byte 2 22) (byte 3 16))
476 :type 'sized-reg/mem)
480 ;;;; This section was added by jrd, for fp instructions.
482 ;;; regular fp inst to/from registers/memory
483 (sb!disassem:define-instruction-format (floating-point 16
485 `(:name :tab reg/mem))
486 (prefix :field (byte 5 3) :value #b11011)
487 (op :fields (list (byte 3 0) (byte 3 11)))
488 (reg/mem :fields (list (byte 2 14) (byte 3 8)) :type 'reg/mem))
490 ;;; fp insn to/from fp reg
491 (sb!disassem:define-instruction-format (floating-point-fp 16
492 :default-printer `(:name :tab fp-reg))
493 (prefix :field (byte 5 3) :value #b11011)
494 (suffix :field (byte 2 14) :value #b11)
495 (op :fields (list (byte 3 0) (byte 3 11)))
496 (fp-reg :field (byte 3 8) :type 'fp-reg))
498 ;;; fp insn to/from fp reg, with the reversed source/destination flag.
499 (sb!disassem:define-instruction-format
500 (floating-point-fp-d 16
501 :default-printer `(:name :tab ,(swap-if 'd "ST0" ", " 'fp-reg)))
502 (prefix :field (byte 5 3) :value #b11011)
503 (suffix :field (byte 2 14) :value #b11)
504 (op :fields (list (byte 2 0) (byte 3 11)))
505 (d :field (byte 1 2))
506 (fp-reg :field (byte 3 8) :type 'fp-reg))
509 ;;; (added by (?) pfw)
510 ;;; fp no operand isns
511 (sb!disassem:define-instruction-format (floating-point-no 16
512 :default-printer '(:name))
513 (prefix :field (byte 8 0) :value #b11011001)
514 (suffix :field (byte 3 13) :value #b111)
515 (op :field (byte 5 8)))
517 (sb!disassem:define-instruction-format (floating-point-3 16
518 :default-printer '(:name))
519 (prefix :field (byte 5 3) :value #b11011)
520 (suffix :field (byte 2 14) :value #b11)
521 (op :fields (list (byte 3 0) (byte 6 8))))
523 (sb!disassem:define-instruction-format (floating-point-5 16
524 :default-printer '(:name))
525 (prefix :field (byte 8 0) :value #b11011011)
526 (suffix :field (byte 3 13) :value #b111)
527 (op :field (byte 5 8)))
529 (sb!disassem:define-instruction-format (floating-point-st 16
530 :default-printer '(:name))
531 (prefix :field (byte 8 0) :value #b11011111)
532 (suffix :field (byte 3 13) :value #b111)
533 (op :field (byte 5 8)))
535 (sb!disassem:define-instruction-format (string-op 8
537 :default-printer '(:name width)))
539 (sb!disassem:define-instruction-format (short-cond-jump 16)
540 (op :field (byte 4 4))
541 (cc :field (byte 4 0) :type 'condition-code)
542 (label :field (byte 8 8) :type 'displacement))
544 (sb!disassem:define-instruction-format (short-jump 16
545 :default-printer '(:name :tab label))
546 (const :field (byte 4 4) :value #b1110)
547 (op :field (byte 4 0))
548 (label :field (byte 8 8) :type 'displacement))
550 (sb!disassem:define-instruction-format (near-cond-jump 16)
551 (op :fields (list (byte 8 0) (byte 4 12)) :value '(#b00001111 #b1000))
552 (cc :field (byte 4 8) :type 'condition-code)
553 ;; The disassembler currently doesn't let you have an instruction > 32 bits
554 ;; long, so we fake it by using a prefilter to read the offset.
555 (label :type 'displacement
556 :prefilter #'(lambda (value dstate)
557 (declare (ignore value)) ; always nil anyway
558 (sb!disassem:read-signed-suffix 32 dstate))))
560 (sb!disassem:define-instruction-format (near-jump 8
561 :default-printer '(:name :tab label))
562 (op :field (byte 8 0))
563 ;; The disassembler currently doesn't let you have an instruction > 32 bits
564 ;; long, so we fake it by using a prefilter to read the address.
565 (label :type 'displacement
566 :prefilter #'(lambda (value dstate)
567 (declare (ignore value)) ; always nil anyway
568 (sb!disassem:read-signed-suffix 32 dstate))))
571 (sb!disassem:define-instruction-format (cond-set 24
572 :default-printer '('set cc :tab reg/mem))
573 (prefix :field (byte 8 0) :value #b00001111)
574 (op :field (byte 4 12) :value #b1001)
575 (cc :field (byte 4 8) :type 'condition-code)
576 (reg/mem :fields (list (byte 2 22) (byte 3 16))
578 (reg :field (byte 3 19) :value #b000))
580 (sb!disassem:define-instruction-format (enter-format 32
581 :default-printer '(:name
583 (:unless (:constant 0)
585 (op :field (byte 8 0))
586 (disp :field (byte 16 8))
587 (level :field (byte 8 24)))
589 ;;; Single byte instruction with an immediate byte argument.
590 (sb!disassem:define-instruction-format (byte-imm 16
591 :default-printer '(:name :tab code))
592 (op :field (byte 8 0))
593 (code :field (byte 8 8)))
595 ;;;; primitive emitters
597 (define-bitfield-emitter emit-word 16
600 (define-bitfield-emitter emit-dword 32
603 (define-bitfield-emitter emit-byte-with-reg 8
604 (byte 5 3) (byte 3 0))
606 (define-bitfield-emitter emit-mod-reg-r/m-byte 8
607 (byte 2 6) (byte 3 3) (byte 3 0))
609 (define-bitfield-emitter emit-sib-byte 8
610 (byte 2 6) (byte 3 3) (byte 3 0))
614 (defun emit-absolute-fixup (segment fixup)
615 (note-fixup segment :absolute fixup)
616 (let ((offset (fixup-offset fixup)))
618 (emit-back-patch segment
619 4 ; FIXME: sb!vm:word-bytes
620 #'(lambda (segment posn)
621 (declare (ignore posn))
623 (- (+ (component-header-length)
624 (or (label-position offset)
626 other-pointer-type))))
627 (emit-dword segment (or offset 0)))))
629 (defun emit-relative-fixup (segment fixup)
630 (note-fixup segment :relative fixup)
631 (emit-dword segment (or (fixup-offset fixup) 0)))
633 ;;;; the effective-address (ea) structure
635 (defun reg-tn-encoding (tn)
636 (declare (type tn tn))
637 (aver (eq (sb-name (sc-sb (tn-sc tn))) 'registers))
638 (let ((offset (tn-offset tn)))
639 (logior (ash (logand offset 1) 2)
642 (defstruct (ea (:constructor make-ea (size &key base index scale disp))
644 (size nil :type (member :byte :word :dword))
645 (base nil :type (or tn null))
646 (index nil :type (or tn null))
647 (scale 1 :type (member 1 2 4 8))
648 (disp 0 :type (or (signed-byte 32) fixup)))
649 (def!method print-object ((ea ea) stream)
650 (cond ((or *print-escape* *print-readably*)
651 (print-unreadable-object (ea stream :type t)
653 "~S~@[ base=~S~]~@[ index=~S~]~@[ scale=~S~]~@[ disp=~S~]"
657 (let ((scale (ea-scale ea)))
658 (if (= scale 1) nil scale))
661 (format stream "~A PTR [" (symbol-name (ea-size ea)))
663 (write-string (x86-location-print-name (ea-base ea)) stream)
665 (write-string "+" stream)))
667 (write-string (x86-location-print-name (ea-index ea)) stream))
668 (unless (= (ea-scale ea) 1)
669 (format stream "*~A" (ea-scale ea)))
670 (typecase (ea-disp ea)
673 (format stream "~@D" (ea-disp ea)))
675 (format stream "+~A" (ea-disp ea))))
676 (write-char #\] stream))))
678 (defun emit-ea (segment thing reg &optional allow-constants)
681 (ecase (sb-name (sc-sb (tn-sc thing)))
683 (emit-mod-reg-r/m-byte segment #b11 reg (reg-tn-encoding thing)))
685 ;; Convert stack tns into an index off of EBP.
686 (let ((disp (- (* (1+ (tn-offset thing)) word-bytes))))
687 (cond ((< -128 disp 127)
688 (emit-mod-reg-r/m-byte segment #b01 reg #b101)
689 (emit-byte segment disp))
691 (emit-mod-reg-r/m-byte segment #b10 reg #b101)
692 (emit-dword segment disp)))))
694 (unless allow-constants
696 "Constant TNs can only be directly used in MOV, PUSH, and CMP."))
697 (emit-mod-reg-r/m-byte segment #b00 reg #b101)
698 (emit-absolute-fixup segment
701 (- (* (tn-offset thing) word-bytes)
702 other-pointer-type))))))
704 (let* ((base (ea-base thing))
705 (index (ea-index thing))
706 (scale (ea-scale thing))
707 (disp (ea-disp thing))
708 (mod (cond ((or (null base)
710 (not (= (reg-tn-encoding base) #b101))))
712 ((and (fixnump disp) (<= -128 disp 127))
716 (r/m (cond (index #b100)
718 (t (reg-tn-encoding base)))))
719 (emit-mod-reg-r/m-byte segment mod reg r/m)
721 (let ((ss (1- (integer-length scale)))
722 (index (if (null index)
724 (let ((index (reg-tn-encoding index)))
726 (error "can't index off of ESP")
728 (base (if (null base)
730 (reg-tn-encoding base))))
731 (emit-sib-byte segment ss index base)))
733 (emit-byte segment disp))
734 ((or (= mod #b10) (null base))
736 (emit-absolute-fixup segment disp)
737 (emit-dword segment disp))))))
739 (emit-mod-reg-r/m-byte segment #b00 reg #b101)
740 (emit-absolute-fixup segment thing))))
742 (defun fp-reg-tn-p (thing)
744 (eq (sb-name (sc-sb (tn-sc thing))) 'float-registers)))
746 ;;; like the above, but for fp-instructions--jrd
747 (defun emit-fp-op (segment thing op)
748 (if (fp-reg-tn-p thing)
749 (emit-byte segment (dpb op (byte 3 3) (dpb (tn-offset thing)
752 (emit-ea segment thing op)))
754 (defun byte-reg-p (thing)
756 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)
757 (member (sc-name (tn-sc thing)) *byte-sc-names*)
760 (defun byte-ea-p (thing)
762 (ea (eq (ea-size thing) :byte))
764 (and (member (sc-name (tn-sc thing)) *byte-sc-names*) t))
767 (defun word-reg-p (thing)
769 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)
770 (member (sc-name (tn-sc thing)) *word-sc-names*)
773 (defun word-ea-p (thing)
775 (ea (eq (ea-size thing) :word))
776 (tn (and (member (sc-name (tn-sc thing)) *word-sc-names*) t))
779 (defun dword-reg-p (thing)
781 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)
782 (member (sc-name (tn-sc thing)) *dword-sc-names*)
785 (defun dword-ea-p (thing)
787 (ea (eq (ea-size thing) :dword))
789 (and (member (sc-name (tn-sc thing)) *dword-sc-names*) t))
792 (defun register-p (thing)
794 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)))
796 (defun accumulator-p (thing)
797 (and (register-p thing)
798 (= (tn-offset thing) 0)))
802 (defconstant +operand-size-prefix-byte+ #b01100110)
804 (defconstant +default-operand-size+ :dword)
806 (defun maybe-emit-operand-size-prefix (segment size)
807 (unless (or (eq size :byte) (eq size +default-operand-size+))
808 (emit-byte segment +operand-size-prefix-byte+)))
810 (defun operand-size (thing)
813 ;; FIXME: might as well be COND instead of having to use #. readmacro
814 ;; to hack up the code
815 (case (sc-name (tn-sc thing))
822 ;; added by jrd: float-registers is a separate size (?)
828 (error "can't tell the size of ~S ~S" thing (sc-name (tn-sc thing))))))
834 (defun matching-operand-size (dst src)
835 (let ((dst-size (operand-size dst))
836 (src-size (operand-size src)))
839 (if (eq dst-size src-size)
841 (error "size mismatch: ~S is a ~S and ~S is a ~S."
842 dst dst-size src src-size))
846 (error "can't tell the size of either ~S or ~S" dst src)))))
848 (defun emit-sized-immediate (segment size value)
851 (emit-byte segment value))
853 (emit-word segment value))
855 (emit-dword segment value))))
857 ;;;; general data transfer
859 (define-instruction mov (segment dst src)
860 ;; immediate to register
861 (:printer reg ((op #b1011) (imm nil :type 'imm-data))
862 '(:name :tab reg ", " imm))
863 ;; absolute mem to/from accumulator
864 (:printer simple-dir ((op #b101000) (imm nil :type 'imm-addr))
865 `(:name :tab ,(swap-if 'dir 'accum ", " '("[" imm "]"))))
866 ;; register to/from register/memory
867 (:printer reg-reg/mem-dir ((op #b100010)))
868 ;; immediate to register/memory
869 (:printer reg/mem-imm ((op '(#b1100011 #b000))))
872 (let ((size (matching-operand-size dst src)))
873 (maybe-emit-operand-size-prefix segment size)
874 (cond ((register-p dst)
875 (cond ((integerp src)
876 (emit-byte-with-reg segment
880 (reg-tn-encoding dst))
881 (emit-sized-immediate segment size src))
882 ((and (fixup-p src) (accumulator-p dst))
887 (emit-absolute-fixup segment src))
893 (emit-ea segment src (reg-tn-encoding dst) t))))
894 ((and (fixup-p dst) (accumulator-p src))
895 (emit-byte segment (if (eq size :byte) #b10100010 #b10100011))
896 (emit-absolute-fixup segment dst))
898 (emit-byte segment (if (eq size :byte) #b11000110 #b11000111))
899 (emit-ea segment dst #b000)
900 (emit-sized-immediate segment size src))
902 (emit-byte segment (if (eq size :byte) #b10001000 #b10001001))
903 (emit-ea segment dst (reg-tn-encoding src)))
905 (aver (eq size :dword))
906 (emit-byte segment #b11000111)
907 (emit-ea segment dst #b000)
908 (emit-absolute-fixup segment src))
910 (error "bogus arguments to MOV: ~S ~S" dst src))))))
912 (defun emit-move-with-extension (segment dst src opcode)
913 (aver (register-p dst))
914 (let ((dst-size (operand-size dst))
915 (src-size (operand-size src)))
918 (aver (eq src-size :byte))
919 (maybe-emit-operand-size-prefix segment :word)
920 (emit-byte segment #b00001111)
921 (emit-byte segment opcode)
922 (emit-ea segment src (reg-tn-encoding dst)))
926 (maybe-emit-operand-size-prefix segment :dword)
927 (emit-byte segment #b00001111)
928 (emit-byte segment opcode)
929 (emit-ea segment src (reg-tn-encoding dst)))
931 (emit-byte segment #b00001111)
932 (emit-byte segment (logior opcode 1))
933 (emit-ea segment src (reg-tn-encoding dst))))))))
935 (define-instruction movsx (segment dst src)
936 (:printer ext-reg-reg/mem ((op #b1011111) (reg nil :type 'word-reg)))
937 (:emitter (emit-move-with-extension segment dst src #b10111110)))
939 (define-instruction movzx (segment dst src)
940 (:printer ext-reg-reg/mem ((op #b1011011) (reg nil :type 'word-reg)))
941 (:emitter (emit-move-with-extension segment dst src #b10110110)))
943 (define-instruction push (segment src)
945 (:printer reg-no-width ((op #b01010)))
947 (:printer reg/mem ((op '(#b1111111 #b110)) (width 1)))
949 (:printer byte ((op #b01101010) (imm nil :type 'signed-imm-byte))
951 (:printer byte ((op #b01101000) (imm nil :type 'imm-word))
953 ;; ### segment registers?
956 (cond ((integerp src)
957 (cond ((<= -128 src 127)
958 (emit-byte segment #b01101010)
959 (emit-byte segment src))
961 (emit-byte segment #b01101000)
962 (emit-dword segment src))))
964 ;; Interpret the fixup as an immediate dword to push.
965 (emit-byte segment #b01101000)
966 (emit-absolute-fixup segment src))
968 (let ((size (operand-size src)))
969 (aver (not (eq size :byte)))
970 (maybe-emit-operand-size-prefix segment size)
971 (cond ((register-p src)
972 (emit-byte-with-reg segment #b01010 (reg-tn-encoding src)))
974 (emit-byte segment #b11111111)
975 (emit-ea segment src #b110 t))))))))
977 (define-instruction pusha (segment)
978 (:printer byte ((op #b01100000)))
980 (emit-byte segment #b01100000)))
982 (define-instruction pop (segment dst)
983 (:printer reg-no-width ((op #b01011)))
984 (:printer reg/mem ((op '(#b1000111 #b000)) (width 1)))
986 (let ((size (operand-size dst)))
987 (aver (not (eq size :byte)))
988 (maybe-emit-operand-size-prefix segment size)
989 (cond ((register-p dst)
990 (emit-byte-with-reg segment #b01011 (reg-tn-encoding dst)))
992 (emit-byte segment #b10001111)
993 (emit-ea segment dst #b000))))))
995 (define-instruction popa (segment)
996 (:printer byte ((op #b01100001)))
998 (emit-byte segment #b01100001)))
1000 (define-instruction xchg (segment operand1 operand2)
1001 ;; Register with accumulator.
1002 (:printer reg-no-width ((op #b10010)) '(:name :tab accum ", " reg))
1003 ;; Register/Memory with Register.
1004 (:printer reg-reg/mem ((op #b1000011)))
1006 (let ((size (matching-operand-size operand1 operand2)))
1007 (maybe-emit-operand-size-prefix segment size)
1008 (labels ((xchg-acc-with-something (acc something)
1009 (if (and (not (eq size :byte)) (register-p something))
1010 (emit-byte-with-reg segment
1012 (reg-tn-encoding something))
1013 (xchg-reg-with-something acc something)))
1014 (xchg-reg-with-something (reg something)
1015 (emit-byte segment (if (eq size :byte) #b10000110 #b10000111))
1016 (emit-ea segment something (reg-tn-encoding reg))))
1017 (cond ((accumulator-p operand1)
1018 (xchg-acc-with-something operand1 operand2))
1019 ((accumulator-p operand2)
1020 (xchg-acc-with-something operand2 operand1))
1021 ((register-p operand1)
1022 (xchg-reg-with-something operand1 operand2))
1023 ((register-p operand2)
1024 (xchg-reg-with-something operand2 operand1))
1026 (error "bogus args to XCHG: ~S ~S" operand1 operand2)))))))
1028 (define-instruction lea (segment dst src)
1029 (:printer reg-reg/mem ((op #b1000110) (width 1)))
1031 (aver (dword-reg-p dst))
1032 (emit-byte segment #b10001101)
1033 (emit-ea segment src (reg-tn-encoding dst))))
1035 (define-instruction cmpxchg (segment dst src)
1036 ;; Register/Memory with Register.
1037 (:printer ext-reg-reg/mem ((op #b1011000)) '(:name :tab reg/mem ", " reg))
1039 (aver (register-p src))
1040 (let ((size (matching-operand-size src dst)))
1041 (maybe-emit-operand-size-prefix segment size)
1042 (emit-byte segment #b00001111)
1043 (emit-byte segment (if (eq size :byte) #b10110000 #b10110001))
1044 (emit-ea segment dst (reg-tn-encoding src)))))
1047 ;;;; flag control instructions
1049 ;;; CLC -- Clear Carry Flag.
1050 (define-instruction clc (segment)
1051 (:printer byte ((op #b11111000)))
1053 (emit-byte segment #b11111000)))
1055 ;;; CLD -- Clear Direction Flag.
1056 (define-instruction cld (segment)
1057 (:printer byte ((op #b11111100)))
1059 (emit-byte segment #b11111100)))
1061 ;;; CLI -- Clear Iterrupt Enable Flag.
1062 (define-instruction cli (segment)
1063 (:printer byte ((op #b11111010)))
1065 (emit-byte segment #b11111010)))
1067 ;;; CMC -- Complement Carry Flag.
1068 (define-instruction cmc (segment)
1069 (:printer byte ((op #b11110101)))
1071 (emit-byte segment #b11110101)))
1073 ;;; LAHF -- Load AH into flags.
1074 (define-instruction lahf (segment)
1075 (:printer byte ((op #b10011111)))
1077 (emit-byte segment #b10011111)))
1079 ;;; POPF -- Pop flags.
1080 (define-instruction popf (segment)
1081 (:printer byte ((op #b10011101)))
1083 (emit-byte segment #b10011101)))
1085 ;;; PUSHF -- push flags.
1086 (define-instruction pushf (segment)
1087 (:printer byte ((op #b10011100)))
1089 (emit-byte segment #b10011100)))
1091 ;;; SAHF -- Store AH into flags.
1092 (define-instruction sahf (segment)
1093 (:printer byte ((op #b10011110)))
1095 (emit-byte segment #b10011110)))
1097 ;;; STC -- Set Carry Flag.
1098 (define-instruction stc (segment)
1099 (:printer byte ((op #b11111001)))
1101 (emit-byte segment #b11111001)))
1103 ;;; STD -- Set Direction Flag.
1104 (define-instruction std (segment)
1105 (:printer byte ((op #b11111101)))
1107 (emit-byte segment #b11111101)))
1109 ;;; STI -- Set Interrupt Enable Flag.
1110 (define-instruction sti (segment)
1111 (:printer byte ((op #b11111011)))
1113 (emit-byte segment #b11111011)))
1117 (defun emit-random-arith-inst (name segment dst src opcode
1118 &optional allow-constants)
1119 (let ((size (matching-operand-size dst src)))
1120 (maybe-emit-operand-size-prefix segment size)
1123 (cond ((and (not (eq size :byte)) (<= -128 src 127))
1124 (emit-byte segment #b10000011)
1125 (emit-ea segment dst opcode)
1126 (emit-byte segment src))
1127 ((accumulator-p dst)
1134 (emit-sized-immediate segment size src))
1136 (emit-byte segment (if (eq size :byte) #b10000000 #b10000001))
1137 (emit-ea segment dst opcode)
1138 (emit-sized-immediate segment size src))))
1143 (if (eq size :byte) #b00000000 #b00000001)))
1144 (emit-ea segment dst (reg-tn-encoding src) allow-constants))
1149 (if (eq size :byte) #b00000010 #b00000011)))
1150 (emit-ea segment src (reg-tn-encoding dst) allow-constants))
1152 (error "bogus operands to ~A" name)))))
1154 (eval-when (:compile-toplevel :execute)
1155 (defun arith-inst-printer-list (subop)
1156 `((accum-imm ((op ,(dpb subop (byte 3 2) #b0000010))))
1157 (reg/mem-imm ((op (#b1000000 ,subop))))
1158 (reg/mem-imm ((op (#b1000001 ,subop))
1159 (imm nil :type signed-imm-byte)))
1160 (reg-reg/mem-dir ((op ,(dpb subop (byte 3 1) #b000000))))))
1163 (define-instruction add (segment dst src)
1164 (:printer-list (arith-inst-printer-list #b000))
1165 (:emitter (emit-random-arith-inst "ADD" segment dst src #b000)))
1167 (define-instruction adc (segment dst src)
1168 (:printer-list (arith-inst-printer-list #b010))
1169 (:emitter (emit-random-arith-inst "ADC" segment dst src #b010)))
1171 (define-instruction sub (segment dst src)
1172 (:printer-list (arith-inst-printer-list #b101))
1173 (:emitter (emit-random-arith-inst "SUB" segment dst src #b101)))
1175 (define-instruction sbb (segment dst src)
1176 (:printer-list (arith-inst-printer-list #b011))
1177 (:emitter (emit-random-arith-inst "SBB" segment dst src #b011)))
1179 (define-instruction cmp (segment dst src)
1180 (:printer-list (arith-inst-printer-list #b111))
1181 (:emitter (emit-random-arith-inst "CMP" segment dst src #b111 t)))
1183 (define-instruction inc (segment dst)
1185 (:printer reg-no-width ((op #b01000)))
1187 (:printer reg/mem ((op '(#b1111111 #b000))))
1189 (let ((size (operand-size dst)))
1190 (maybe-emit-operand-size-prefix segment size)
1191 (cond ((and (not (eq size :byte)) (register-p dst))
1192 (emit-byte-with-reg segment #b01000 (reg-tn-encoding dst)))
1194 (emit-byte segment (if (eq size :byte) #b11111110 #b11111111))
1195 (emit-ea segment dst #b000))))))
1197 (define-instruction dec (segment dst)
1199 (:printer reg-no-width ((op #b01001)))
1201 (:printer reg/mem ((op '(#b1111111 #b001))))
1203 (let ((size (operand-size dst)))
1204 (maybe-emit-operand-size-prefix segment size)
1205 (cond ((and (not (eq size :byte)) (register-p dst))
1206 (emit-byte-with-reg segment #b01001 (reg-tn-encoding dst)))
1208 (emit-byte segment (if (eq size :byte) #b11111110 #b11111111))
1209 (emit-ea segment dst #b001))))))
1211 (define-instruction neg (segment dst)
1212 (:printer reg/mem ((op '(#b1111011 #b011))))
1214 (let ((size (operand-size dst)))
1215 (maybe-emit-operand-size-prefix segment size)
1216 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1217 (emit-ea segment dst #b011))))
1219 (define-instruction aaa (segment)
1220 (:printer byte ((op #b00110111)))
1222 (emit-byte segment #b00110111)))
1224 (define-instruction aas (segment)
1225 (:printer byte ((op #b00111111)))
1227 (emit-byte segment #b00111111)))
1229 (define-instruction daa (segment)
1230 (:printer byte ((op #b00100111)))
1232 (emit-byte segment #b00100111)))
1234 (define-instruction das (segment)
1235 (:printer byte ((op #b00101111)))
1237 (emit-byte segment #b00101111)))
1239 (define-instruction mul (segment dst src)
1240 (:printer accum-reg/mem ((op '(#b1111011 #b100))))
1242 (let ((size (matching-operand-size dst src)))
1243 (aver (accumulator-p dst))
1244 (maybe-emit-operand-size-prefix segment size)
1245 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1246 (emit-ea segment src #b100))))
1248 (define-instruction imul (segment dst &optional src1 src2)
1249 (:printer accum-reg/mem ((op '(#b1111011 #b101))))
1250 (:printer ext-reg-reg/mem ((op #b1010111)))
1251 (:printer reg-reg/mem ((op #b0110100) (width 1) (imm nil :type 'imm-word))
1252 '(:name :tab reg ", " reg/mem ", " imm))
1253 (:printer reg-reg/mem ((op #b0110101) (width 1)
1254 (imm nil :type 'signed-imm-byte))
1255 '(:name :tab reg ", " reg/mem ", " imm))
1257 (flet ((r/m-with-immed-to-reg (reg r/m immed)
1258 (let* ((size (matching-operand-size reg r/m))
1259 (sx (and (not (eq size :byte)) (<= -128 immed 127))))
1260 (maybe-emit-operand-size-prefix segment size)
1261 (emit-byte segment (if sx #b01101011 #b01101001))
1262 (emit-ea segment r/m (reg-tn-encoding reg))
1264 (emit-byte segment immed)
1265 (emit-sized-immediate segment size immed)))))
1267 (r/m-with-immed-to-reg dst src1 src2))
1270 (r/m-with-immed-to-reg dst dst src1)
1271 (let ((size (matching-operand-size dst src1)))
1272 (maybe-emit-operand-size-prefix segment size)
1273 (emit-byte segment #b00001111)
1274 (emit-byte segment #b10101111)
1275 (emit-ea segment src1 (reg-tn-encoding dst)))))
1277 (let ((size (operand-size dst)))
1278 (maybe-emit-operand-size-prefix segment size)
1279 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1280 (emit-ea segment dst #b101)))))))
1282 (define-instruction div (segment dst src)
1283 (:printer accum-reg/mem ((op '(#b1111011 #b110))))
1285 (let ((size (matching-operand-size dst src)))
1286 (aver (accumulator-p dst))
1287 (maybe-emit-operand-size-prefix segment size)
1288 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1289 (emit-ea segment src #b110))))
1291 (define-instruction idiv (segment dst src)
1292 (:printer accum-reg/mem ((op '(#b1111011 #b111))))
1294 (let ((size (matching-operand-size dst src)))
1295 (aver (accumulator-p dst))
1296 (maybe-emit-operand-size-prefix segment size)
1297 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1298 (emit-ea segment src #b111))))
1300 (define-instruction aad (segment)
1301 (:printer two-bytes ((op '(#b11010101 #b00001010))))
1303 (emit-byte segment #b11010101)
1304 (emit-byte segment #b00001010)))
1306 (define-instruction aam (segment)
1307 (:printer two-bytes ((op '(#b11010100 #b00001010))))
1309 (emit-byte segment #b11010100)
1310 (emit-byte segment #b00001010)))
1312 ;;; CBW -- Convert Byte to Word. AX <- sign_xtnd(AL)
1313 (define-instruction cbw (segment)
1315 (maybe-emit-operand-size-prefix segment :word)
1316 (emit-byte segment #b10011000)))
1318 ;;; CWDE -- Convert Word To Double Word Extened. EAX <- sign_xtnd(AX)
1319 (define-instruction cwde (segment)
1321 (maybe-emit-operand-size-prefix segment :dword)
1322 (emit-byte segment #b10011000)))
1324 ;;; CWD -- Convert Word to Double Word. DX:AX <- sign_xtnd(AX)
1325 (define-instruction cwd (segment)
1327 (maybe-emit-operand-size-prefix segment :word)
1328 (emit-byte segment #b10011001)))
1330 ;;; CDQ -- Convert Double Word to Quad Word. EDX:EAX <- sign_xtnd(EAX)
1331 (define-instruction cdq (segment)
1332 (:printer byte ((op #b10011001)))
1334 (maybe-emit-operand-size-prefix segment :dword)
1335 (emit-byte segment #b10011001)))
1337 (define-instruction xadd (segment dst src)
1338 ;; Register/Memory with Register.
1339 (:printer ext-reg-reg/mem ((op #b1100000)) '(:name :tab reg/mem ", " reg))
1341 (aver (register-p src))
1342 (let ((size (matching-operand-size src dst)))
1343 (maybe-emit-operand-size-prefix segment size)
1344 (emit-byte segment #b00001111)
1345 (emit-byte segment (if (eq size :byte) #b11000000 #b11000001))
1346 (emit-ea segment dst (reg-tn-encoding src)))))
1351 (defun emit-shift-inst (segment dst amount opcode)
1352 (let ((size (operand-size dst)))
1353 (maybe-emit-operand-size-prefix segment size)
1354 (multiple-value-bind (major-opcode immed)
1356 (:cl (values #b11010010 nil))
1357 (1 (values #b11010000 nil))
1358 (t (values #b11000000 t)))
1360 (if (eq size :byte) major-opcode (logior major-opcode 1)))
1361 (emit-ea segment dst opcode)
1363 (emit-byte segment amount)))))
1365 (eval-when (:compile-toplevel :execute)
1366 (defun shift-inst-printer-list (subop)
1367 `((reg/mem ((op (#b1101000 ,subop)))
1368 (:name :tab reg/mem ", 1"))
1369 (reg/mem ((op (#b1101001 ,subop)))
1370 (:name :tab reg/mem ", " 'cl))
1371 (reg/mem-imm ((op (#b1100000 ,subop))
1372 (imm nil :type signed-imm-byte))))))
1374 (define-instruction rol (segment dst amount)
1376 (shift-inst-printer-list #b000))
1378 (emit-shift-inst segment dst amount #b000)))
1380 (define-instruction ror (segment dst amount)
1382 (shift-inst-printer-list #b001))
1384 (emit-shift-inst segment dst amount #b001)))
1386 (define-instruction rcl (segment dst amount)
1388 (shift-inst-printer-list #b010))
1390 (emit-shift-inst segment dst amount #b010)))
1392 (define-instruction rcr (segment dst amount)
1394 (shift-inst-printer-list #b011))
1396 (emit-shift-inst segment dst amount #b011)))
1398 (define-instruction shl (segment dst amount)
1400 (shift-inst-printer-list #b100))
1402 (emit-shift-inst segment dst amount #b100)))
1404 (define-instruction shr (segment dst amount)
1406 (shift-inst-printer-list #b101))
1408 (emit-shift-inst segment dst amount #b101)))
1410 (define-instruction sar (segment dst amount)
1412 (shift-inst-printer-list #b111))
1414 (emit-shift-inst segment dst amount #b111)))
1416 (defun emit-double-shift (segment opcode dst src amt)
1417 (let ((size (matching-operand-size dst src)))
1418 (when (eq size :byte)
1419 (error "Double shifts can only be used with words."))
1420 (maybe-emit-operand-size-prefix segment size)
1421 (emit-byte segment #b00001111)
1422 (emit-byte segment (dpb opcode (byte 1 3)
1423 (if (eq amt :cl) #b10100101 #b10100100)))
1425 (emit-ea segment dst src)
1426 (emit-ea segment dst (reg-tn-encoding src)) ; pw tries this
1427 (unless (eq amt :cl)
1428 (emit-byte segment amt))))
1430 (eval-when (:compile-toplevel :execute)
1431 (defun double-shift-inst-printer-list (op)
1433 (ext-reg-reg/mem-imm ((op ,(logior op #b100))
1434 (imm nil :type signed-imm-byte)))
1435 (ext-reg-reg/mem ((op ,(logior op #b101)))
1436 (:name :tab reg/mem ", " 'cl)))))
1438 (define-instruction shld (segment dst src amt)
1439 (:declare (type (or (member :cl) (mod 32)) amt))
1440 (:printer-list (double-shift-inst-printer-list #b10100000))
1442 (emit-double-shift segment #b0 dst src amt)))
1444 (define-instruction shrd (segment dst src amt)
1445 (:declare (type (or (member :cl) (mod 32)) amt))
1446 (:printer-list (double-shift-inst-printer-list #b10101000))
1448 (emit-double-shift segment #b1 dst src amt)))
1450 (define-instruction and (segment dst src)
1452 (arith-inst-printer-list #b100))
1454 (emit-random-arith-inst "AND" segment dst src #b100)))
1456 (define-instruction test (segment this that)
1457 (:printer accum-imm ((op #b1010100)))
1458 (:printer reg/mem-imm ((op '(#b1111011 #b000))))
1459 (:printer reg-reg/mem ((op #b1000010)))
1461 (let ((size (matching-operand-size this that)))
1462 (maybe-emit-operand-size-prefix segment size)
1463 (flet ((test-immed-and-something (immed something)
1464 (cond ((accumulator-p something)
1466 (if (eq size :byte) #b10101000 #b10101001))
1467 (emit-sized-immediate segment size immed))
1470 (if (eq size :byte) #b11110110 #b11110111))
1471 (emit-ea segment something #b000)
1472 (emit-sized-immediate segment size immed))))
1473 (test-reg-and-something (reg something)
1474 (emit-byte segment (if (eq size :byte) #b10000100 #b10000101))
1475 (emit-ea segment something (reg-tn-encoding reg))))
1476 (cond ((integerp that)
1477 (test-immed-and-something that this))
1479 (test-immed-and-something this that))
1481 (test-reg-and-something this that))
1483 (test-reg-and-something that this))
1485 (error "bogus operands for TEST: ~S and ~S" this that)))))))
1487 (define-instruction or (segment dst src)
1489 (arith-inst-printer-list #b001))
1491 (emit-random-arith-inst "OR" segment dst src #b001)))
1493 (define-instruction xor (segment dst src)
1495 (arith-inst-printer-list #b110))
1497 (emit-random-arith-inst "XOR" segment dst src #b110)))
1499 (define-instruction not (segment dst)
1500 (:printer reg/mem ((op '(#b1111011 #b010))))
1502 (let ((size (operand-size dst)))
1503 (maybe-emit-operand-size-prefix segment size)
1504 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1505 (emit-ea segment dst #b010))))
1507 ;;;; string manipulation
1509 (define-instruction cmps (segment size)
1510 (:printer string-op ((op #b1010011)))
1512 (maybe-emit-operand-size-prefix segment size)
1513 (emit-byte segment (if (eq size :byte) #b10100110 #b10100111))))
1515 (define-instruction ins (segment acc)
1516 (:printer string-op ((op #b0110110)))
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) #b01101100 #b01101101)))))
1523 (define-instruction lods (segment acc)
1524 (:printer string-op ((op #b1010110)))
1526 (let ((size (operand-size acc)))
1527 (aver (accumulator-p acc))
1528 (maybe-emit-operand-size-prefix segment size)
1529 (emit-byte segment (if (eq size :byte) #b10101100 #b10101101)))))
1531 (define-instruction movs (segment size)
1532 (:printer string-op ((op #b1010010)))
1534 (maybe-emit-operand-size-prefix segment size)
1535 (emit-byte segment (if (eq size :byte) #b10100100 #b10100101))))
1537 (define-instruction outs (segment acc)
1538 (:printer string-op ((op #b0110111)))
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) #b01101110 #b01101111)))))
1545 (define-instruction scas (segment acc)
1546 (:printer string-op ((op #b1010111)))
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) #b10101110 #b10101111)))))
1553 (define-instruction stos (segment acc)
1554 (:printer string-op ((op #b1010101)))
1556 (let ((size (operand-size acc)))
1557 (aver (accumulator-p acc))
1558 (maybe-emit-operand-size-prefix segment size)
1559 (emit-byte segment (if (eq size :byte) #b10101010 #b10101011)))))
1561 (define-instruction xlat (segment)
1562 (:printer byte ((op #b11010111)))
1564 (emit-byte segment #b11010111)))
1566 (define-instruction rep (segment)
1568 (emit-byte segment #b11110010)))
1570 (define-instruction repe (segment)
1571 (:printer byte ((op #b11110011)))
1573 (emit-byte segment #b11110011)))
1575 (define-instruction repne (segment)
1576 (:printer byte ((op #b11110010)))
1578 (emit-byte segment #b11110010)))
1581 ;;;; bit manipulation
1583 (define-instruction bsf (segment dst src)
1585 (let ((size (matching-operand-size dst src)))
1586 (when (eq size :byte)
1587 (error "can't scan bytes: ~S" src))
1588 (maybe-emit-operand-size-prefix segment size)
1589 (emit-byte segment #b00001111)
1590 (emit-byte segment #b10111100)
1591 (emit-ea segment src (reg-tn-encoding dst)))))
1593 (define-instruction bsr (segment dst src)
1595 (let ((size (matching-operand-size dst src)))
1596 (when (eq size :byte)
1597 (error "can't scan bytes: ~S" src))
1598 (maybe-emit-operand-size-prefix segment size)
1599 (emit-byte segment #b00001111)
1600 (emit-byte segment #b10111101)
1601 (emit-ea segment src (reg-tn-encoding dst)))))
1603 (defun emit-bit-test-and-mumble (segment src index opcode)
1604 (let ((size (operand-size src)))
1605 (when (eq size :byte)
1606 (error "can't scan bytes: ~S" src))
1607 (maybe-emit-operand-size-prefix segment size)
1608 (emit-byte segment #b00001111)
1609 (cond ((integerp index)
1610 (emit-byte segment #b10111010)
1611 (emit-ea segment src opcode)
1612 (emit-byte segment index))
1614 (emit-byte segment (dpb opcode (byte 3 3) #b10000011))
1615 (emit-ea segment src (reg-tn-encoding index))))))
1617 (define-instruction bt (segment src index)
1619 (emit-bit-test-and-mumble segment src index #b100)))
1621 (define-instruction btc (segment src index)
1623 (emit-bit-test-and-mumble segment src index #b111)))
1625 (define-instruction btr (segment src index)
1627 (emit-bit-test-and-mumble segment src index #b110)))
1629 (define-instruction bts (segment src index)
1631 (emit-bit-test-and-mumble segment src index #b101)))
1634 ;;;; control transfer
1636 (define-instruction call (segment where)
1637 (:printer near-jump ((op #b11101000)))
1638 (:printer reg/mem ((op '(#b1111111 #b010)) (width 1)))
1642 (emit-byte segment #b11101000)
1643 (emit-back-patch segment
1645 #'(lambda (segment posn)
1647 (- (label-position where)
1650 (emit-byte segment #b11101000)
1651 (emit-relative-fixup segment where))
1653 (emit-byte segment #b11111111)
1654 (emit-ea segment where #b010)))))
1656 (defun emit-byte-displacement-backpatch (segment target)
1657 (emit-back-patch segment
1659 #'(lambda (segment posn)
1660 (let ((disp (- (label-position target) (1+ posn))))
1661 (aver (<= -128 disp 127))
1662 (emit-byte segment disp)))))
1664 (define-instruction jmp (segment cond &optional where)
1665 ;; conditional jumps
1666 (:printer short-cond-jump ((op #b0111)) '('j cc :tab label))
1667 (:printer near-cond-jump () '('j cc :tab label))
1668 ;; unconditional jumps
1669 (:printer short-jump ((op #b1011)))
1670 (:printer near-jump ((op #b11101001)) )
1671 (:printer reg/mem ((op '(#b1111111 #b100)) (width 1)))
1676 #'(lambda (segment posn delta-if-after)
1677 (let ((disp (- (label-position where posn delta-if-after)
1679 (when (<= -128 disp 127)
1681 (dpb (conditional-opcode cond)
1684 (emit-byte-displacement-backpatch segment where)
1686 #'(lambda (segment posn)
1687 (let ((disp (- (label-position where) (+ posn 6))))
1688 (emit-byte segment #b00001111)
1690 (dpb (conditional-opcode cond)
1693 (emit-dword segment disp)))))
1694 ((label-p (setq where cond))
1697 #'(lambda (segment posn delta-if-after)
1698 (let ((disp (- (label-position where posn delta-if-after)
1700 (when (<= -128 disp 127)
1701 (emit-byte segment #b11101011)
1702 (emit-byte-displacement-backpatch segment where)
1704 #'(lambda (segment posn)
1705 (let ((disp (- (label-position where) (+ posn 5))))
1706 (emit-byte segment #b11101001)
1707 (emit-dword segment disp))
1710 (emit-byte segment #b11101001)
1711 (emit-relative-fixup segment where))
1713 (unless (or (ea-p where) (tn-p where))
1714 (error "don't know what to do with ~A" where))
1715 (emit-byte segment #b11111111)
1716 (emit-ea segment where #b100)))))
1718 (define-instruction jmp-short (segment label)
1720 (emit-byte segment #b11101011)
1721 (emit-byte-displacement-backpatch segment label)))
1723 (define-instruction ret (segment &optional stack-delta)
1724 (:printer byte ((op #b11000011)))
1725 (:printer byte ((op #b11000010) (imm nil :type 'imm-word-16))
1729 (emit-byte segment #b11000010)
1730 (emit-word segment stack-delta))
1732 (emit-byte segment #b11000011)))))
1734 (define-instruction jecxz (segment target)
1735 (:printer short-jump ((op #b0011)))
1737 (emit-byte segment #b11100011)
1738 (emit-byte-displacement-backpatch segment target)))
1740 (define-instruction loop (segment target)
1741 (:printer short-jump ((op #b0010)))
1743 (emit-byte segment #b11100010) ; pfw this was 11100011, or jecxz!!!!
1744 (emit-byte-displacement-backpatch segment target)))
1746 (define-instruction loopz (segment target)
1747 (:printer short-jump ((op #b0001)))
1749 (emit-byte segment #b11100001)
1750 (emit-byte-displacement-backpatch segment target)))
1752 (define-instruction loopnz (segment target)
1753 (:printer short-jump ((op #b0000)))
1755 (emit-byte segment #b11100000)
1756 (emit-byte-displacement-backpatch segment target)))
1758 ;;;; conditional byte set
1760 (define-instruction set (segment dst cond)
1761 (:printer cond-set ())
1763 (emit-byte segment #b00001111)
1764 (emit-byte segment (dpb (conditional-opcode cond) (byte 4 0) #b10010000))
1765 (emit-ea segment dst #b000)))
1769 (define-instruction enter (segment disp &optional (level 0))
1770 (:declare (type (unsigned-byte 16) disp)
1771 (type (unsigned-byte 8) level))
1772 (:printer enter-format ((op #b11001000)))
1774 (emit-byte segment #b11001000)
1775 (emit-word segment disp)
1776 (emit-byte segment level)))
1778 (define-instruction leave (segment)
1779 (:printer byte ((op #b11001001)))
1781 (emit-byte segment #b11001001)))
1783 ;;;; interrupt instructions
1785 (defun snarf-error-junk (sap offset &optional length-only)
1786 (let* ((length (sb!sys:sap-ref-8 sap offset))
1787 (vector (make-array length :element-type '(unsigned-byte 8))))
1788 (declare (type sb!sys:system-area-pointer sap)
1789 (type (unsigned-byte 8) length)
1790 (type (simple-array (unsigned-byte 8) (*)) vector))
1792 (values 0 (1+ length) nil nil))
1794 (sb!kernel:copy-from-system-area sap (* byte-bits (1+ offset))
1797 (* length byte-bits))
1798 (collect ((sc-offsets)
1800 (lengths 1) ; the length byte
1802 (error-number (sb!c::read-var-integer vector index)))
1805 (when (>= index length)
1807 (let ((old-index index))
1808 (sc-offsets (sb!c::read-var-integer vector index))
1809 (lengths (- index old-index))))
1810 (values error-number
1816 (defmacro break-cases (breaknum &body cases)
1817 (let ((bn-temp (gensym)))
1818 (collect ((clauses))
1819 (dolist (case cases)
1820 (clauses `((= ,bn-temp ,(car case)) ,@(cdr case))))
1821 `(let ((,bn-temp ,breaknum))
1822 (cond ,@(clauses))))))
1825 (defun break-control (chunk inst stream dstate)
1826 (declare (ignore inst))
1827 (flet ((nt (x) (if stream (sb!disassem:note x dstate))))
1828 ;; FIXME: Make sure that BYTE-IMM-CODE is defined. The genesis
1829 ;; map has it undefined; and it should be easier to look in the target
1830 ;; Lisp (with (DESCRIBE 'BYTE-IMM-CODE)) than to definitively deduce
1831 ;; from first principles whether it's defined in some way that genesis
1833 (case (byte-imm-code chunk dstate)
1836 (sb!disassem:handle-break-args #'snarf-error-junk stream dstate))
1837 (#.sb!vm:cerror-trap
1839 (sb!disassem:handle-break-args #'snarf-error-junk stream dstate))
1840 (#.sb!vm:breakpoint-trap
1841 (nt "breakpoint trap"))
1842 (#.sb!vm:pending-interrupt-trap
1843 (nt "pending interrupt trap"))
1846 (#.sb!vm:function-end-breakpoint-trap
1847 (nt "function end breakpoint trap")))))
1849 (define-instruction break (segment code)
1850 (:declare (type (unsigned-byte 8) code))
1851 (:printer byte-imm ((op #b11001100)) '(:name :tab code)
1852 :control #'break-control)
1854 (emit-byte segment #b11001100)
1855 (emit-byte segment code)))
1857 (define-instruction int (segment number)
1858 (:declare (type (unsigned-byte 8) number))
1859 (:printer byte-imm ((op #b11001101)))
1863 (emit-byte segment #b11001100))
1865 (emit-byte segment #b11001101)
1866 (emit-byte segment number)))))
1868 (define-instruction into (segment)
1869 (:printer byte ((op #b11001110)))
1871 (emit-byte segment #b11001110)))
1873 (define-instruction bound (segment reg bounds)
1875 (let ((size (matching-operand-size reg bounds)))
1876 (when (eq size :byte)
1877 (error "can't bounds-test bytes: ~S" reg))
1878 (maybe-emit-operand-size-prefix segment size)
1879 (emit-byte segment #b01100010)
1880 (emit-ea segment bounds (reg-tn-encoding reg)))))
1882 (define-instruction iret (segment)
1883 (:printer byte ((op #b11001111)))
1885 (emit-byte segment #b11001111)))
1887 ;;;; processor control
1889 (define-instruction hlt (segment)
1890 (:printer byte ((op #b11110100)))
1892 (emit-byte segment #b11110100)))
1894 (define-instruction nop (segment)
1895 (:printer byte ((op #b10010000)))
1897 (emit-byte segment #b10010000)))
1899 (define-instruction wait (segment)
1900 (:printer byte ((op #b10011011)))
1902 (emit-byte segment #b10011011)))
1904 (define-instruction lock (segment)
1905 (:printer byte ((op #b11110000)))
1907 (emit-byte segment #b11110000)))
1909 ;;;; miscellaneous hackery
1911 (define-instruction byte (segment byte)
1913 (emit-byte segment byte)))
1915 (define-instruction word (segment word)
1917 (emit-word segment word)))
1919 (define-instruction dword (segment dword)
1921 (emit-dword segment dword)))
1923 (defun emit-header-data (segment type)
1924 (emit-back-patch segment
1926 (lambda (segment posn)
1930 (component-header-length))
1934 (define-instruction function-header-word (segment)
1936 (emit-header-data segment function-header-type)))
1938 (define-instruction lra-header-word (segment)
1940 (emit-header-data segment return-pc-header-type)))
1942 ;;;; fp instructions
1944 ;;;; FIXME: This section said "added by jrd", which should end up in CREDITS.
1946 ;;;; Note: We treat the single-precision and double-precision variants
1947 ;;;; as separate instructions.
1949 ;;; Load single to st(0).
1950 (define-instruction fld (segment source)
1951 (:printer floating-point ((op '(#b001 #b000))))
1953 (emit-byte segment #b11011001)
1954 (emit-fp-op segment source #b000)))
1956 ;;; Load double to st(0).
1957 (define-instruction fldd (segment source)
1958 (:printer floating-point ((op '(#b101 #b000))))
1959 (:printer floating-point-fp ((op '(#b001 #b000))))
1961 (if (fp-reg-tn-p source)
1962 (emit-byte segment #b11011001)
1963 (emit-byte segment #b11011101))
1964 (emit-fp-op segment source #b000)))
1966 ;;; Load long to st(0).
1967 (define-instruction fldl (segment source)
1968 (:printer floating-point ((op '(#b011 #b101))))
1970 (emit-byte segment #b11011011)
1971 (emit-fp-op segment source #b101)))
1973 ;;; Store single from st(0).
1974 (define-instruction fst (segment dest)
1975 (:printer floating-point ((op '(#b001 #b010))))
1977 (cond ((fp-reg-tn-p dest)
1978 (emit-byte segment #b11011101)
1979 (emit-fp-op segment dest #b010))
1981 (emit-byte segment #b11011001)
1982 (emit-fp-op segment dest #b010)))))
1984 ;;; Store double from st(0).
1985 (define-instruction fstd (segment dest)
1986 (:printer floating-point ((op '(#b101 #b010))))
1987 (:printer floating-point-fp ((op '(#b101 #b010))))
1989 (cond ((fp-reg-tn-p dest)
1990 (emit-byte segment #b11011101)
1991 (emit-fp-op segment dest #b010))
1993 (emit-byte segment #b11011101)
1994 (emit-fp-op segment dest #b010)))))
1996 ;;; Arithmetic ops are all done with at least one operand at top of
1997 ;;; stack. The other operand is is another register or a 32/64 bit
2000 ;;; dtc: I've tried to follow the Intel ASM386 conventions, but note
2001 ;;; that these conflict with the Gdb conventions for binops. To reduce
2002 ;;; the confusion I've added comments showing the mathamatical
2003 ;;; operation and the two syntaxes. By the ASM386 convention the
2004 ;;; instruction syntax is:
2007 ;;; or Fop Destination, Source
2009 ;;; If only one operand is given then it is the source and the
2010 ;;; destination is ST(0). There are reversed forms of the fsub and
2011 ;;; fdiv instructions inducated by an 'R' suffix.
2013 ;;; The mathematical operation for the non-reverse form is always:
2014 ;;; destination = destination op source
2016 ;;; For the reversed form it is:
2017 ;;; destination = source op destination
2019 ;;; The instructions below only accept one operand at present which is
2020 ;;; usually the source. I've hack in extra instructions to implement
2021 ;;; the fops with a ST(i) destination, these have a -sti suffix and
2022 ;;; the operand is the destination with the source being ST(0).
2025 ;;; st(0) = st(0) + memory or st(i).
2026 (define-instruction fadd (segment source)
2027 (:printer floating-point ((op '(#b000 #b000))))
2029 (emit-byte segment #b11011000)
2030 (emit-fp-op segment source #b000)))
2033 ;;; st(0) = st(0) + memory or st(i).
2034 (define-instruction faddd (segment source)
2035 (:printer floating-point ((op '(#b100 #b000))))
2036 (:printer floating-point-fp ((op '(#b000 #b000))))
2038 (if (fp-reg-tn-p source)
2039 (emit-byte segment #b11011000)
2040 (emit-byte segment #b11011100))
2041 (emit-fp-op segment source #b000)))
2043 ;;; Add double destination st(i):
2044 ;;; st(i) = st(0) + st(i).
2045 (define-instruction fadd-sti (segment destination)
2046 (:printer floating-point-fp ((op '(#b100 #b000))))
2048 (aver (fp-reg-tn-p destination))
2049 (emit-byte segment #b11011100)
2050 (emit-fp-op segment destination #b000)))
2052 (define-instruction faddp-sti (segment destination)
2053 (:printer floating-point-fp ((op '(#b110 #b000))))
2055 (aver (fp-reg-tn-p destination))
2056 (emit-byte segment #b11011110)
2057 (emit-fp-op segment destination #b000)))
2059 ;;; Subtract single:
2060 ;;; st(0) = st(0) - memory or st(i).
2061 (define-instruction fsub (segment source)
2062 (:printer floating-point ((op '(#b000 #b100))))
2064 (emit-byte segment #b11011000)
2065 (emit-fp-op segment source #b100)))
2067 ;;; Subtract single, reverse:
2068 ;;; st(0) = memory or st(i) - st(0).
2069 (define-instruction fsubr (segment source)
2070 (:printer floating-point ((op '(#b000 #b101))))
2072 (emit-byte segment #b11011000)
2073 (emit-fp-op segment source #b101)))
2075 ;;; Subtract double:
2076 ;;; st(0) = st(0) - memory or st(i).
2077 (define-instruction fsubd (segment source)
2078 (:printer floating-point ((op '(#b100 #b100))))
2079 (:printer floating-point-fp ((op '(#b000 #b100))))
2081 (if (fp-reg-tn-p source)
2082 (emit-byte segment #b11011000)
2083 (emit-byte segment #b11011100))
2084 (emit-fp-op segment source #b100)))
2086 ;;; Subtract double, reverse:
2087 ;;; st(0) = memory or st(i) - st(0).
2088 (define-instruction fsubrd (segment source)
2089 (:printer floating-point ((op '(#b100 #b101))))
2090 (:printer floating-point-fp ((op '(#b000 #b101))))
2092 (if (fp-reg-tn-p source)
2093 (emit-byte segment #b11011000)
2094 (emit-byte segment #b11011100))
2095 (emit-fp-op segment source #b101)))
2097 ;;; Subtract double, destination st(i):
2098 ;;; st(i) = st(i) - st(0).
2100 ;;; ASM386 syntax: FSUB ST(i), ST
2101 ;;; Gdb syntax: fsubr %st,%st(i)
2102 (define-instruction fsub-sti (segment destination)
2103 (:printer floating-point-fp ((op '(#b100 #b101))))
2105 (aver (fp-reg-tn-p destination))
2106 (emit-byte segment #b11011100)
2107 (emit-fp-op segment destination #b101)))
2109 (define-instruction fsubp-sti (segment destination)
2110 (:printer floating-point-fp ((op '(#b110 #b101))))
2112 (aver (fp-reg-tn-p destination))
2113 (emit-byte segment #b11011110)
2114 (emit-fp-op segment destination #b101)))
2116 ;;; Subtract double, reverse, destination st(i):
2117 ;;; st(i) = st(0) - st(i).
2119 ;;; ASM386 syntax: FSUBR ST(i), ST
2120 ;;; Gdb syntax: fsub %st,%st(i)
2121 (define-instruction fsubr-sti (segment destination)
2122 (:printer floating-point-fp ((op '(#b100 #b100))))
2124 (aver (fp-reg-tn-p destination))
2125 (emit-byte segment #b11011100)
2126 (emit-fp-op segment destination #b100)))
2128 (define-instruction fsubrp-sti (segment destination)
2129 (:printer floating-point-fp ((op '(#b110 #b100))))
2131 (aver (fp-reg-tn-p destination))
2132 (emit-byte segment #b11011110)
2133 (emit-fp-op segment destination #b100)))
2135 ;;; Multiply single:
2136 ;;; st(0) = st(0) * memory or st(i).
2137 (define-instruction fmul (segment source)
2138 (:printer floating-point ((op '(#b000 #b001))))
2140 (emit-byte segment #b11011000)
2141 (emit-fp-op segment source #b001)))
2143 ;;; Multiply double:
2144 ;;; st(0) = st(0) * memory or st(i).
2145 (define-instruction fmuld (segment source)
2146 (:printer floating-point ((op '(#b100 #b001))))
2147 (:printer floating-point-fp ((op '(#b000 #b001))))
2149 (if (fp-reg-tn-p source)
2150 (emit-byte segment #b11011000)
2151 (emit-byte segment #b11011100))
2152 (emit-fp-op segment source #b001)))
2154 ;;; Multiply double, destination st(i):
2155 ;;; st(i) = st(i) * st(0).
2156 (define-instruction fmul-sti (segment destination)
2157 (:printer floating-point-fp ((op '(#b100 #b001))))
2159 (aver (fp-reg-tn-p destination))
2160 (emit-byte segment #b11011100)
2161 (emit-fp-op segment destination #b001)))
2164 ;;; st(0) = st(0) / memory or st(i).
2165 (define-instruction fdiv (segment source)
2166 (:printer floating-point ((op '(#b000 #b110))))
2168 (emit-byte segment #b11011000)
2169 (emit-fp-op segment source #b110)))
2171 ;;; Divide single, reverse:
2172 ;;; st(0) = memory or st(i) / st(0).
2173 (define-instruction fdivr (segment source)
2174 (:printer floating-point ((op '(#b000 #b111))))
2176 (emit-byte segment #b11011000)
2177 (emit-fp-op segment source #b111)))
2180 ;;; st(0) = st(0) / memory or st(i).
2181 (define-instruction fdivd (segment source)
2182 (:printer floating-point ((op '(#b100 #b110))))
2183 (:printer floating-point-fp ((op '(#b000 #b110))))
2185 (if (fp-reg-tn-p source)
2186 (emit-byte segment #b11011000)
2187 (emit-byte segment #b11011100))
2188 (emit-fp-op segment source #b110)))
2190 ;;; Divide double, reverse:
2191 ;;; st(0) = memory or st(i) / st(0).
2192 (define-instruction fdivrd (segment source)
2193 (:printer floating-point ((op '(#b100 #b111))))
2194 (:printer floating-point-fp ((op '(#b000 #b111))))
2196 (if (fp-reg-tn-p source)
2197 (emit-byte segment #b11011000)
2198 (emit-byte segment #b11011100))
2199 (emit-fp-op segment source #b111)))
2201 ;;; Divide double, destination st(i):
2202 ;;; st(i) = st(i) / st(0).
2204 ;;; ASM386 syntax: FDIV ST(i), ST
2205 ;;; Gdb syntax: fdivr %st,%st(i)
2206 (define-instruction fdiv-sti (segment destination)
2207 (:printer floating-point-fp ((op '(#b100 #b111))))
2209 (aver (fp-reg-tn-p destination))
2210 (emit-byte segment #b11011100)
2211 (emit-fp-op segment destination #b111)))
2213 ;;; Divide double, reverse, destination st(i):
2214 ;;; st(i) = st(0) / st(i).
2216 ;;; ASM386 syntax: FDIVR ST(i), ST
2217 ;;; Gdb syntax: fdiv %st,%st(i)
2218 (define-instruction fdivr-sti (segment destination)
2219 (:printer floating-point-fp ((op '(#b100 #b110))))
2221 (aver (fp-reg-tn-p destination))
2222 (emit-byte segment #b11011100)
2223 (emit-fp-op segment destination #b110)))
2225 ;;; Exchange fr0 with fr(n). (There is no double precision variant.)
2226 (define-instruction fxch (segment source)
2227 (:printer floating-point-fp ((op '(#b001 #b001))))
2229 (unless (and (tn-p source)
2230 (eq (sb-name (sc-sb (tn-sc source))) 'float-registers))
2232 (emit-byte segment #b11011001)
2233 (emit-fp-op segment source #b001)))
2235 ;;; Push 32-bit integer to st0.
2236 (define-instruction fild (segment source)
2237 (:printer floating-point ((op '(#b011 #b000))))
2239 (emit-byte segment #b11011011)
2240 (emit-fp-op segment source #b000)))
2242 ;;; Push 64-bit integer to st0.
2243 (define-instruction fildl (segment source)
2244 (:printer floating-point ((op '(#b111 #b101))))
2246 (emit-byte segment #b11011111)
2247 (emit-fp-op segment source #b101)))
2249 ;;; Store 32-bit integer.
2250 (define-instruction fist (segment dest)
2251 (:printer floating-point ((op '(#b011 #b010))))
2253 (emit-byte segment #b11011011)
2254 (emit-fp-op segment dest #b010)))
2256 ;;; Store and pop 32-bit integer.
2257 (define-instruction fistp (segment dest)
2258 (:printer floating-point ((op '(#b011 #b011))))
2260 (emit-byte segment #b11011011)
2261 (emit-fp-op segment dest #b011)))
2263 ;;; Store and pop 64-bit integer.
2264 (define-instruction fistpl (segment dest)
2265 (:printer floating-point ((op '(#b111 #b111))))
2267 (emit-byte segment #b11011111)
2268 (emit-fp-op segment dest #b111)))
2270 ;;; Store single from st(0) and pop.
2271 (define-instruction fstp (segment dest)
2272 (:printer floating-point ((op '(#b001 #b011))))
2274 (cond ((fp-reg-tn-p dest)
2275 (emit-byte segment #b11011101)
2276 (emit-fp-op segment dest #b011))
2278 (emit-byte segment #b11011001)
2279 (emit-fp-op segment dest #b011)))))
2281 ;;; Store double from st(0) and pop.
2282 (define-instruction fstpd (segment dest)
2283 (:printer floating-point ((op '(#b101 #b011))))
2284 (:printer floating-point-fp ((op '(#b101 #b011))))
2286 (cond ((fp-reg-tn-p dest)
2287 (emit-byte segment #b11011101)
2288 (emit-fp-op segment dest #b011))
2290 (emit-byte segment #b11011101)
2291 (emit-fp-op segment dest #b011)))))
2293 ;;; Store long from st(0) and pop.
2294 (define-instruction fstpl (segment dest)
2295 (:printer floating-point ((op '(#b011 #b111))))
2297 (emit-byte segment #b11011011)
2298 (emit-fp-op segment dest #b111)))
2300 ;;; Decrement stack-top pointer.
2301 (define-instruction fdecstp (segment)
2302 (:printer floating-point-no ((op #b10110)))
2304 (emit-byte segment #b11011001)
2305 (emit-byte segment #b11110110)))
2307 ;;; Increment stack-top pointer.
2308 (define-instruction fincstp (segment)
2309 (:printer floating-point-no ((op #b10111)))
2311 (emit-byte segment #b11011001)
2312 (emit-byte segment #b11110111)))
2314 ;;; Free fp register.
2315 (define-instruction ffree (segment dest)
2316 (:printer floating-point-fp ((op '(#b101 #b000))))
2318 (emit-byte segment #b11011101)
2319 (emit-fp-op segment dest #b000)))
2321 (define-instruction fabs (segment)
2322 (:printer floating-point-no ((op #b00001)))
2324 (emit-byte segment #b11011001)
2325 (emit-byte segment #b11100001)))
2327 (define-instruction fchs (segment)
2328 (:printer floating-point-no ((op #b00000)))
2330 (emit-byte segment #b11011001)
2331 (emit-byte segment #b11100000)))
2333 (define-instruction frndint(segment)
2334 (:printer floating-point-no ((op #b11100)))
2336 (emit-byte segment #b11011001)
2337 (emit-byte segment #b11111100)))
2340 (define-instruction fninit(segment)
2341 (:printer floating-point-5 ((op #b00011)))
2343 (emit-byte segment #b11011011)
2344 (emit-byte segment #b11100011)))
2346 ;;; Store Status Word to AX.
2347 (define-instruction fnstsw(segment)
2348 (:printer floating-point-st ((op #b00000)))
2350 (emit-byte segment #b11011111)
2351 (emit-byte segment #b11100000)))
2353 ;;; Load Control Word.
2355 ;;; src must be a memory location
2356 (define-instruction fldcw(segment src)
2357 (:printer floating-point ((op '(#b001 #b101))))
2359 (emit-byte segment #b11011001)
2360 (emit-fp-op segment src #b101)))
2362 ;;; Store Control Word.
2363 (define-instruction fnstcw(segment dst)
2364 (:printer floating-point ((op '(#b001 #b111))))
2366 (emit-byte segment #b11011001)
2367 (emit-fp-op segment dst #b111)))
2369 ;;; Store FP Environment.
2370 (define-instruction fstenv(segment dst)
2371 (:printer floating-point ((op '(#b001 #b110))))
2373 (emit-byte segment #b11011001)
2374 (emit-fp-op segment dst #b110)))
2376 ;;; Restore FP Environment.
2377 (define-instruction fldenv(segment src)
2378 (:printer floating-point ((op '(#b001 #b100))))
2380 (emit-byte segment #b11011001)
2381 (emit-fp-op segment src #b100)))
2384 (define-instruction fsave(segment dst)
2385 (:printer floating-point ((op '(#b101 #b110))))
2387 (emit-byte segment #b11011101)
2388 (emit-fp-op segment dst #b110)))
2390 ;;; Restore FP State.
2391 (define-instruction frstor(segment src)
2392 (:printer floating-point ((op '(#b101 #b100))))
2394 (emit-byte segment #b11011101)
2395 (emit-fp-op segment src #b100)))
2397 ;;; Clear exceptions.
2398 (define-instruction fnclex(segment)
2399 (:printer floating-point-5 ((op #b00010)))
2401 (emit-byte segment #b11011011)
2402 (emit-byte segment #b11100010)))
2405 (define-instruction fcom (segment src)
2406 (:printer floating-point ((op '(#b000 #b010))))
2408 (emit-byte segment #b11011000)
2409 (emit-fp-op segment src #b010)))
2411 (define-instruction fcomd (segment src)
2412 (:printer floating-point ((op '(#b100 #b010))))
2413 (:printer floating-point-fp ((op '(#b000 #b010))))
2415 (if (fp-reg-tn-p src)
2416 (emit-byte segment #b11011000)
2417 (emit-byte segment #b11011100))
2418 (emit-fp-op segment src #b010)))
2420 ;;; Compare ST1 to ST0, popping the stack twice.
2421 (define-instruction fcompp (segment)
2422 (:printer floating-point-3 ((op '(#b110 #b011001))))
2424 (emit-byte segment #b11011110)
2425 (emit-byte segment #b11011001)))
2427 ;;; unordered comparison
2428 (define-instruction fucom (segment src)
2429 ;; XX Printer conflicts with frstor
2430 ;; (:printer floating-point ((op '(#b101 #b100))))
2432 (aver (fp-reg-tn-p src))
2433 (emit-byte segment #b11011101)
2434 (emit-fp-op segment src #b100)))
2436 (define-instruction ftst (segment)
2437 (:printer floating-point-no ((op #b00100)))
2439 (emit-byte segment #b11011001)
2440 (emit-byte segment #b11100100)))
2444 (define-instruction fsqrt(segment)
2445 (:printer floating-point-no ((op #b11010)))
2447 (emit-byte segment #b11011001)
2448 (emit-byte segment #b11111010)))
2450 (define-instruction fscale(segment)
2451 (:printer floating-point-no ((op #b11101)))
2453 (emit-byte segment #b11011001)
2454 (emit-byte segment #b11111101)))
2456 (define-instruction fxtract(segment)
2457 (:printer floating-point-no ((op #b10100)))
2459 (emit-byte segment #b11011001)
2460 (emit-byte segment #b11110100)))
2462 (define-instruction fsin(segment)
2463 (:printer floating-point-no ((op #b11110)))
2465 (emit-byte segment #b11011001)
2466 (emit-byte segment #b11111110)))
2468 (define-instruction fcos(segment)
2469 (:printer floating-point-no ((op #b11111)))
2471 (emit-byte segment #b11011001)
2472 (emit-byte segment #b11111111)))
2474 (define-instruction fprem1(segment)
2475 (:printer floating-point-no ((op #b10101)))
2477 (emit-byte segment #b11011001)
2478 (emit-byte segment #b11110101)))
2480 (define-instruction fprem(segment)
2481 (:printer floating-point-no ((op #b11000)))
2483 (emit-byte segment #b11011001)
2484 (emit-byte segment #b11111000)))
2486 (define-instruction fxam (segment)
2487 (:printer floating-point-no ((op #b00101)))
2489 (emit-byte segment #b11011001)
2490 (emit-byte segment #b11100101)))
2492 ;;; These do push/pop to stack and need special handling
2493 ;;; in any VOPs that use them. See the book.
2495 ;;; st0 <- st1*log2(st0)
2496 (define-instruction fyl2x(segment) ; pops stack
2497 (:printer floating-point-no ((op #b10001)))
2499 (emit-byte segment #b11011001)
2500 (emit-byte segment #b11110001)))
2502 (define-instruction fyl2xp1(segment)
2503 (:printer floating-point-no ((op #b11001)))
2505 (emit-byte segment #b11011001)
2506 (emit-byte segment #b11111001)))
2508 (define-instruction f2xm1(segment)
2509 (:printer floating-point-no ((op #b10000)))
2511 (emit-byte segment #b11011001)
2512 (emit-byte segment #b11110000)))
2514 (define-instruction fptan(segment) ; st(0) <- 1; st(1) <- tan
2515 (:printer floating-point-no ((op #b10010)))
2517 (emit-byte segment #b11011001)
2518 (emit-byte segment #b11110010)))
2520 (define-instruction fpatan(segment) ; POPS STACK
2521 (:printer floating-point-no ((op #b10011)))
2523 (emit-byte segment #b11011001)
2524 (emit-byte segment #b11110011)))
2526 ;;;; loading constants
2528 (define-instruction fldz(segment)
2529 (:printer floating-point-no ((op #b01110)))
2531 (emit-byte segment #b11011001)
2532 (emit-byte segment #b11101110)))
2534 (define-instruction fld1(segment)
2535 (:printer floating-point-no ((op #b01000)))
2537 (emit-byte segment #b11011001)
2538 (emit-byte segment #b11101000)))
2540 (define-instruction fldpi(segment)
2541 (:printer floating-point-no ((op #b01011)))
2543 (emit-byte segment #b11011001)
2544 (emit-byte segment #b11101011)))
2546 (define-instruction fldl2t(segment)
2547 (:printer floating-point-no ((op #b01001)))
2549 (emit-byte segment #b11011001)
2550 (emit-byte segment #b11101001)))
2552 (define-instruction fldl2e(segment)
2553 (:printer floating-point-no ((op #b01010)))
2555 (emit-byte segment #b11011001)
2556 (emit-byte segment #b11101010)))
2558 (define-instruction fldlg2(segment)
2559 (:printer floating-point-no ((op #b01100)))
2561 (emit-byte segment #b11011001)
2562 (emit-byte segment #b11101100)))
2564 (define-instruction fldln2(segment)
2565 (:printer floating-point-no ((op #b01101)))
2567 (emit-byte segment #b11011001)
2568 (emit-byte segment #b11101101)))