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))
289 (defun prefilter-fp-reg (value dstate)
291 (declare (ignore dstate))
294 (sb!disassem:define-argument-type fp-reg
295 :prefilter #'prefilter-fp-reg
296 :printer #'print-fp-reg)
298 (sb!disassem:define-argument-type width
299 :prefilter #'prefilter-width
300 :printer #'(lambda (value stream dstate)
303 (and (numberp value) (zerop value))) ; zzz jrd
306 ;; set by a prefix instruction
307 (or (sb!disassem:dstate-get-prop dstate 'word-width)
308 +default-operand-size+)))
309 (princ (schar (symbol-name word-width) 0) stream)))))
311 (eval-when (:compile-toplevel :load-toplevel :execute)
312 (defconstant conditions
315 (:b . 2) (:nae . 2) (:c . 2)
316 (:nb . 3) (:ae . 3) (:nc . 3)
317 (:eq . 4) (:e . 4) (:z . 4)
324 (:np . 11) (:po . 11)
325 (:l . 12) (:nge . 12)
326 (:nl . 13) (:ge . 13)
327 (:le . 14) (:ng . 14)
328 (:nle . 15) (:g . 15)))
330 (defparameter *condition-name-vec*
331 (let ((vec (make-array 16 :initial-element nil)))
332 (dolist (cond conditions)
333 (when (null (aref vec (cdr cond)))
334 (setf (aref vec (cdr cond)) (car cond))))
338 ;;; Set assembler parameters. (In CMU CL, this was done with
339 ;;; a call to a macro DEF-ASSEMBLER-PARAMS.)
340 (eval-when (:compile-toplevel :load-toplevel :execute)
341 (setf sb!assem:*assem-scheduler-p* nil))
343 (sb!disassem:define-argument-type condition-code
344 :printer *condition-name-vec*)
346 (defun conditional-opcode (condition)
347 (cdr (assoc condition conditions :test #'eq)))
349 ;;;; disassembler instruction formats
351 (eval-when (:compile-toplevel :execute)
352 (defun swap-if (direction field1 separator field2)
353 `(:if (,direction :constant 0)
354 (,field1 ,separator ,field2)
355 (,field2 ,separator ,field1))))
357 (sb!disassem:define-instruction-format (byte 8 :default-printer '(:name))
358 (op :field (byte 8 0))
363 (sb!disassem:define-instruction-format (simple 8)
364 (op :field (byte 7 1))
365 (width :field (byte 1 0) :type 'width)
370 ;;; Same as simple, but with direction bit
371 (sb!disassem:define-instruction-format (simple-dir 8 :include 'simple)
372 (op :field (byte 6 2))
373 (dir :field (byte 1 1)))
375 ;;; Same as simple, but with the immediate value occurring by default,
376 ;;; and with an appropiate printer.
377 (sb!disassem:define-instruction-format (accum-imm 8
379 :default-printer '(:name
380 :tab accum ", " imm))
381 (imm :type 'imm-data))
383 (sb!disassem:define-instruction-format (reg-no-width 8
384 :default-printer '(:name :tab reg))
385 (op :field (byte 5 3))
386 (reg :field (byte 3 0) :type 'word-reg)
388 (accum :type 'word-accum)
391 ;;; adds a width field to reg-no-width
392 (sb!disassem:define-instruction-format (reg 8
393 :default-printer '(:name :tab reg))
394 (op :field (byte 4 4))
395 (width :field (byte 1 3) :type 'width)
396 (reg :field (byte 3 0) :type 'reg)
402 ;;; Same as reg, but with direction bit
403 (sb!disassem:define-instruction-format (reg-dir 8 :include 'reg)
404 (op :field (byte 3 5))
405 (dir :field (byte 1 4)))
407 (sb!disassem:define-instruction-format (two-bytes 16
408 :default-printer '(:name))
409 (op :fields (list (byte 8 0) (byte 8 8))))
411 (sb!disassem:define-instruction-format (reg-reg/mem 16
413 `(:name :tab reg ", " reg/mem))
414 (op :field (byte 7 1))
415 (width :field (byte 1 0) :type 'width)
416 (reg/mem :fields (list (byte 2 14) (byte 3 8))
418 (reg :field (byte 3 11) :type 'reg)
422 ;;; same as reg-reg/mem, but with direction bit
423 (sb!disassem:define-instruction-format (reg-reg/mem-dir 16
424 :include 'reg-reg/mem
428 ,(swap-if 'dir 'reg/mem ", " 'reg)))
429 (op :field (byte 6 2))
430 (dir :field (byte 1 1)))
432 ;;; Same as reg-rem/mem, but uses the reg field as a second op code.
433 (sb!disassem:define-instruction-format (reg/mem 16
434 :default-printer '(:name :tab reg/mem))
435 (op :fields (list (byte 7 1) (byte 3 11)))
436 (width :field (byte 1 0) :type 'width)
437 (reg/mem :fields (list (byte 2 14) (byte 3 8))
438 :type 'sized-reg/mem)
442 ;;; Same as reg/mem, but with the immediate value occurring by default,
443 ;;; and with an appropiate printer.
444 (sb!disassem:define-instruction-format (reg/mem-imm 16
447 '(:name :tab reg/mem ", " imm))
448 (reg/mem :type 'sized-reg/mem)
449 (imm :type 'imm-data))
451 ;;; Same as reg/mem, but with using the accumulator in the default printer
452 (sb!disassem:define-instruction-format
454 :include 'reg/mem :default-printer '(:name :tab accum ", " reg/mem))
455 (reg/mem :type 'reg/mem) ; don't need a size
456 (accum :type 'accum))
458 ;;; Same as reg-reg/mem, but with a prefix of #b00001111
459 (sb!disassem:define-instruction-format (ext-reg-reg/mem 24
461 `(:name :tab reg ", " reg/mem))
462 (prefix :field (byte 8 0) :value #b00001111)
463 (op :field (byte 7 9))
464 (width :field (byte 1 8) :type 'width)
465 (reg/mem :fields (list (byte 2 22) (byte 3 16))
467 (reg :field (byte 3 19) :type 'reg)
471 ;;; Same as reg/mem, but with a prefix of #b00001111
472 (sb!disassem:define-instruction-format (ext-reg/mem 24
473 :default-printer '(:name :tab reg/mem))
474 (prefix :field (byte 8 0) :value #b00001111)
475 (op :fields (list (byte 7 9) (byte 3 19)))
476 (width :field (byte 1 8) :type 'width)
477 (reg/mem :fields (list (byte 2 22) (byte 3 16))
478 :type 'sized-reg/mem)
482 ;;;; This section was added by jrd, for fp instructions.
484 ;;; regular fp inst to/from registers/memory
485 (sb!disassem:define-instruction-format (floating-point 16
487 `(:name :tab reg/mem))
488 (prefix :field (byte 5 3) :value #b11011)
489 (op :fields (list (byte 3 0) (byte 3 11)))
490 (reg/mem :fields (list (byte 2 14) (byte 3 8)) :type 'reg/mem))
492 ;;; fp insn to/from fp reg
493 (sb!disassem:define-instruction-format (floating-point-fp 16
494 :default-printer `(:name :tab fp-reg))
495 (prefix :field (byte 5 3) :value #b11011)
496 (suffix :field (byte 2 14) :value #b11)
497 (op :fields (list (byte 3 0) (byte 3 11)))
498 (fp-reg :field (byte 3 8) :type 'fp-reg))
500 ;;; fp insn to/from fp reg, with the reversed source/destination flag.
501 (sb!disassem:define-instruction-format
502 (floating-point-fp-d 16
503 :default-printer `(:name :tab ,(swap-if 'd "ST0" ", " 'fp-reg)))
504 (prefix :field (byte 5 3) :value #b11011)
505 (suffix :field (byte 2 14) :value #b11)
506 (op :fields (list (byte 2 0) (byte 3 11)))
507 (d :field (byte 1 2))
508 (fp-reg :field (byte 3 8) :type 'fp-reg))
511 ;;; (added by (?) pfw)
512 ;;; fp no operand isns
513 (sb!disassem:define-instruction-format (floating-point-no 16
514 :default-printer '(:name))
515 (prefix :field (byte 8 0) :value #b11011001)
516 (suffix :field (byte 3 13) :value #b111)
517 (op :field (byte 5 8)))
519 (sb!disassem:define-instruction-format (floating-point-3 16
520 :default-printer '(:name))
521 (prefix :field (byte 5 3) :value #b11011)
522 (suffix :field (byte 2 14) :value #b11)
523 (op :fields (list (byte 3 0) (byte 6 8))))
525 (sb!disassem:define-instruction-format (floating-point-5 16
526 :default-printer '(:name))
527 (prefix :field (byte 8 0) :value #b11011011)
528 (suffix :field (byte 3 13) :value #b111)
529 (op :field (byte 5 8)))
531 (sb!disassem:define-instruction-format (floating-point-st 16
532 :default-printer '(:name))
533 (prefix :field (byte 8 0) :value #b11011111)
534 (suffix :field (byte 3 13) :value #b111)
535 (op :field (byte 5 8)))
537 (sb!disassem:define-instruction-format (string-op 8
539 :default-printer '(:name width)))
541 (sb!disassem:define-instruction-format (short-cond-jump 16)
542 (op :field (byte 4 4))
543 (cc :field (byte 4 0) :type 'condition-code)
544 (label :field (byte 8 8) :type 'displacement))
546 (sb!disassem:define-instruction-format (short-jump 16
547 :default-printer '(:name :tab label))
548 (const :field (byte 4 4) :value #b1110)
549 (op :field (byte 4 0))
550 (label :field (byte 8 8) :type 'displacement))
552 (sb!disassem:define-instruction-format (near-cond-jump 16)
553 (op :fields (list (byte 8 0) (byte 4 12)) :value '(#b00001111 #b1000))
554 (cc :field (byte 4 8) :type 'condition-code)
555 ;; The disassembler currently doesn't let you have an instruction > 32 bits
556 ;; long, so we fake it by using a prefilter to read the offset.
557 (label :type 'displacement
558 :prefilter #'(lambda (value dstate)
559 (declare (ignore value)) ; always nil anyway
560 (sb!disassem:read-signed-suffix 32 dstate))))
562 (sb!disassem:define-instruction-format (near-jump 8
563 :default-printer '(:name :tab label))
564 (op :field (byte 8 0))
565 ;; The disassembler currently doesn't let you have an instruction > 32 bits
566 ;; long, so we fake it by using a prefilter to read the address.
567 (label :type 'displacement
568 :prefilter #'(lambda (value dstate)
569 (declare (ignore value)) ; always nil anyway
570 (sb!disassem:read-signed-suffix 32 dstate))))
573 (sb!disassem:define-instruction-format (cond-set 24
574 :default-printer '('set cc :tab reg/mem))
575 (prefix :field (byte 8 0) :value #b00001111)
576 (op :field (byte 4 12) :value #b1001)
577 (cc :field (byte 4 8) :type 'condition-code)
578 (reg/mem :fields (list (byte 2 22) (byte 3 16))
580 (reg :field (byte 3 19) :value #b000))
582 (sb!disassem:define-instruction-format (enter-format 32
583 :default-printer '(:name
585 (:unless (:constant 0)
587 (op :field (byte 8 0))
588 (disp :field (byte 16 8))
589 (level :field (byte 8 24)))
591 ;;; Single byte instruction with an immediate byte argument.
592 (sb!disassem:define-instruction-format (byte-imm 16
593 :default-printer '(:name :tab code))
594 (op :field (byte 8 0))
595 (code :field (byte 8 8)))
597 ;;;; primitive emitters
599 (define-bitfield-emitter emit-word 16
602 (define-bitfield-emitter emit-dword 32
605 (define-bitfield-emitter emit-byte-with-reg 8
606 (byte 5 3) (byte 3 0))
608 (define-bitfield-emitter emit-mod-reg-r/m-byte 8
609 (byte 2 6) (byte 3 3) (byte 3 0))
611 (define-bitfield-emitter emit-sib-byte 8
612 (byte 2 6) (byte 3 3) (byte 3 0))
616 (defun emit-absolute-fixup (segment fixup)
617 (note-fixup segment :absolute fixup)
618 (let ((offset (fixup-offset fixup)))
620 (emit-back-patch segment
621 4 ; FIXME: sb!vm:word-bytes
622 #'(lambda (segment posn)
623 (declare (ignore posn))
625 (- (+ (component-header-length)
626 (or (label-position offset)
628 other-pointer-type))))
629 (emit-dword segment (or offset 0)))))
631 (defun emit-relative-fixup (segment fixup)
632 (note-fixup segment :relative fixup)
633 (emit-dword segment (or (fixup-offset fixup) 0)))
635 ;;;; the effective-address (ea) structure
637 (defun reg-tn-encoding (tn)
638 (declare (type tn tn))
639 (assert (eq (sb-name (sc-sb (tn-sc tn))) 'registers))
640 (let ((offset (tn-offset tn)))
641 (logior (ash (logand offset 1) 2)
644 (defstruct (ea (:constructor make-ea (size &key base index scale disp)))
645 (size nil :type (member :byte :word :dword))
646 (base nil :type (or tn null))
647 (index nil :type (or tn null))
648 (scale 1 :type (member 1 2 4 8))
649 (disp 0 :type (or (signed-byte 32) fixup)))
650 (def!method print-object ((ea ea) stream)
651 (cond ((or *print-escape* *print-readably*)
652 (print-unreadable-object (ea stream :type t)
654 "~S~@[ base=~S~]~@[ index=~S~]~@[ scale=~S~]~@[ disp=~S~]"
658 (let ((scale (ea-scale ea)))
659 (if (= scale 1) nil scale))
662 (format stream "~A PTR [" (symbol-name (ea-size ea)))
664 (write-string (x86-location-print-name (ea-base ea)) stream)
666 (write-string "+" stream)))
668 (write-string (x86-location-print-name (ea-index ea)) stream))
669 (unless (= (ea-scale ea) 1)
670 (format stream "*~A" (ea-scale ea)))
671 (typecase (ea-disp ea)
674 (format stream "~@D" (ea-disp ea)))
676 (format stream "+~A" (ea-disp ea))))
677 (write-char #\] stream))))
679 (defun emit-ea (segment thing reg &optional allow-constants)
682 (ecase (sb-name (sc-sb (tn-sc thing)))
684 (emit-mod-reg-r/m-byte segment #b11 reg (reg-tn-encoding thing)))
686 ;; Convert stack tns into an index off of EBP.
687 (let ((disp (- (* (1+ (tn-offset thing)) word-bytes))))
688 (cond ((< -128 disp 127)
689 (emit-mod-reg-r/m-byte segment #b01 reg #b101)
690 (emit-byte segment disp))
692 (emit-mod-reg-r/m-byte segment #b10 reg #b101)
693 (emit-dword segment disp)))))
695 (unless allow-constants
697 "Constant TNs can only be directly used in MOV, PUSH, and CMP."))
698 (emit-mod-reg-r/m-byte segment #b00 reg #b101)
699 (emit-absolute-fixup segment
702 (- (* (tn-offset thing) word-bytes)
703 other-pointer-type))))))
705 (let* ((base (ea-base thing))
706 (index (ea-index thing))
707 (scale (ea-scale thing))
708 (disp (ea-disp thing))
709 (mod (cond ((or (null base)
711 (not (= (reg-tn-encoding base) #b101))))
713 ((and (target-fixnump disp) (<= -128 disp 127))
717 (r/m (cond (index #b100)
719 (t (reg-tn-encoding base)))))
720 (emit-mod-reg-r/m-byte segment mod reg r/m)
722 (let ((ss (1- (integer-length scale)))
723 (index (if (null index)
725 (let ((index (reg-tn-encoding index)))
727 (error "can't index off of ESP")
729 (base (if (null base)
731 (reg-tn-encoding base))))
732 (emit-sib-byte segment ss index base)))
734 (emit-byte segment disp))
735 ((or (= mod #b10) (null base))
737 (emit-absolute-fixup segment disp)
738 (emit-dword segment disp))))))
740 (emit-mod-reg-r/m-byte segment #b00 reg #b101)
741 (emit-absolute-fixup segment thing))))
743 (defun fp-reg-tn-p (thing)
745 (eq (sb-name (sc-sb (tn-sc thing))) 'float-registers)))
747 ;;; like the above, but for fp-instructions--jrd
748 (defun emit-fp-op (segment thing op)
749 (if (fp-reg-tn-p thing)
750 (emit-byte segment (dpb op (byte 3 3) (dpb (tn-offset thing)
753 (emit-ea segment thing op)))
755 (defun byte-reg-p (thing)
757 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)
758 (member (sc-name (tn-sc thing)) byte-sc-names)
761 (defun byte-ea-p (thing)
763 (ea (eq (ea-size thing) :byte))
765 (and (member (sc-name (tn-sc thing)) byte-sc-names) t))
768 (defun word-reg-p (thing)
770 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)
771 (member (sc-name (tn-sc thing)) word-sc-names)
774 (defun word-ea-p (thing)
776 (ea (eq (ea-size thing) :word))
777 (tn (and (member (sc-name (tn-sc thing)) word-sc-names) t))
780 (defun dword-reg-p (thing)
782 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)
783 (member (sc-name (tn-sc thing)) dword-sc-names)
786 (defun dword-ea-p (thing)
788 (ea (eq (ea-size thing) :dword))
790 (and (member (sc-name (tn-sc thing)) dword-sc-names) t))
793 (defun register-p (thing)
795 (eq (sb-name (sc-sb (tn-sc thing))) 'registers)))
797 (defun accumulator-p (thing)
798 (and (register-p thing)
799 (= (tn-offset thing) 0)))
803 (defconstant +operand-size-prefix-byte+ #b01100110)
805 (defconstant +default-operand-size+ :dword)
807 (defun maybe-emit-operand-size-prefix (segment size)
808 (unless (or (eq size :byte) (eq size +default-operand-size+))
809 (emit-byte segment +operand-size-prefix-byte+)))
811 (defun operand-size (thing)
814 (case (sc-name (tn-sc thing))
821 ;; added by jrd. float-registers is a separate size (?)
827 (error "can't tell the size of ~S ~S" thing (sc-name (tn-sc thing))))))
833 (defun matching-operand-size (dst src)
834 (let ((dst-size (operand-size dst))
835 (src-size (operand-size src)))
838 (if (eq dst-size src-size)
840 (error "size mismatch: ~S is a ~S and ~S is a ~S."
841 dst dst-size src src-size))
845 (error "can't tell the size of either ~S or ~S" dst src)))))
847 (defun emit-sized-immediate (segment size value)
850 (emit-byte segment value))
852 (emit-word segment value))
854 (emit-dword segment value))))
856 ;;;; general data transfer
858 (define-instruction mov (segment dst src)
859 ;; immediate to register
860 (:printer reg ((op #b1011) (imm nil :type 'imm-data))
861 '(:name :tab reg ", " imm))
862 ;; absolute mem to/from accumulator
863 (:printer simple-dir ((op #b101000) (imm nil :type 'imm-addr))
864 `(:name :tab ,(swap-if 'dir 'accum ", " '("[" imm "]"))))
865 ;; register to/from register/memory
866 (:printer reg-reg/mem-dir ((op #b100010)))
867 ;; immediate to register/memory
868 (:printer reg/mem-imm ((op '(#b1100011 #b000))))
871 (let ((size (matching-operand-size dst src)))
872 (maybe-emit-operand-size-prefix segment size)
873 (cond ((register-p dst)
874 (cond ((integerp src)
875 (emit-byte-with-reg segment
879 (reg-tn-encoding dst))
880 (emit-sized-immediate segment size src))
881 ((and (fixup-p src) (accumulator-p dst))
886 (emit-absolute-fixup segment src))
892 (emit-ea segment src (reg-tn-encoding dst) t))))
893 ((and (fixup-p dst) (accumulator-p src))
894 (emit-byte segment (if (eq size :byte) #b10100010 #b10100011))
895 (emit-absolute-fixup segment dst))
897 (emit-byte segment (if (eq size :byte) #b11000110 #b11000111))
898 (emit-ea segment dst #b000)
899 (emit-sized-immediate segment size src))
901 (emit-byte segment (if (eq size :byte) #b10001000 #b10001001))
902 (emit-ea segment dst (reg-tn-encoding src)))
904 (assert (eq size :dword))
905 (emit-byte segment #b11000111)
906 (emit-ea segment dst #b000)
907 (emit-absolute-fixup segment src))
909 (error "bogus arguments to MOV: ~S ~S" dst src))))))
911 (defun emit-move-with-extension (segment dst src opcode)
912 (assert (register-p dst))
913 (let ((dst-size (operand-size dst))
914 (src-size (operand-size src)))
917 (assert (eq src-size :byte))
918 (maybe-emit-operand-size-prefix segment :word)
919 (emit-byte segment #b00001111)
920 (emit-byte segment opcode)
921 (emit-ea segment src (reg-tn-encoding dst)))
925 (maybe-emit-operand-size-prefix segment :dword)
926 (emit-byte segment #b00001111)
927 (emit-byte segment opcode)
928 (emit-ea segment src (reg-tn-encoding dst)))
930 (emit-byte segment #b00001111)
931 (emit-byte segment (logior opcode 1))
932 (emit-ea segment src (reg-tn-encoding dst))))))))
934 (define-instruction movsx (segment dst src)
935 (:printer ext-reg-reg/mem ((op #b1011111) (reg nil :type 'word-reg)))
936 (:emitter (emit-move-with-extension segment dst src #b10111110)))
938 (define-instruction movzx (segment dst src)
939 (:printer ext-reg-reg/mem ((op #b1011011) (reg nil :type 'word-reg)))
940 (:emitter (emit-move-with-extension segment dst src #b10110110)))
942 (define-instruction push (segment src)
944 (:printer reg-no-width ((op #b01010)))
946 (:printer reg/mem ((op '(#b1111111 #b110)) (width 1)))
948 (:printer byte ((op #b01101010) (imm nil :type 'signed-imm-byte))
950 (:printer byte ((op #b01101000) (imm nil :type 'imm-word))
952 ;; ### segment registers?
955 (cond ((integerp src)
956 (cond ((<= -128 src 127)
957 (emit-byte segment #b01101010)
958 (emit-byte segment src))
960 (emit-byte segment #b01101000)
961 (emit-dword segment src))))
963 ;; Interpret the fixup as an immediate dword to push.
964 (emit-byte segment #b01101000)
965 (emit-absolute-fixup segment src))
967 (let ((size (operand-size src)))
968 (assert (not (eq size :byte)))
969 (maybe-emit-operand-size-prefix segment size)
970 (cond ((register-p src)
971 (emit-byte-with-reg segment #b01010 (reg-tn-encoding src)))
973 (emit-byte segment #b11111111)
974 (emit-ea segment src #b110 t))))))))
976 (define-instruction pusha (segment)
977 (:printer byte ((op #b01100000)))
979 (emit-byte segment #b01100000)))
981 (define-instruction pop (segment dst)
982 (:printer reg-no-width ((op #b01011)))
983 (:printer reg/mem ((op '(#b1000111 #b000)) (width 1)))
985 (let ((size (operand-size dst)))
986 (assert (not (eq size :byte)))
987 (maybe-emit-operand-size-prefix segment size)
988 (cond ((register-p dst)
989 (emit-byte-with-reg segment #b01011 (reg-tn-encoding dst)))
991 (emit-byte segment #b10001111)
992 (emit-ea segment dst #b000))))))
994 (define-instruction popa (segment)
995 (:printer byte ((op #b01100001)))
997 (emit-byte segment #b01100001)))
999 (define-instruction xchg (segment operand1 operand2)
1000 ;; Register with accumulator.
1001 (:printer reg-no-width ((op #b10010)) '(:name :tab accum ", " reg))
1002 ;; Register/Memory with Register.
1003 (:printer reg-reg/mem ((op #b1000011)))
1005 (let ((size (matching-operand-size operand1 operand2)))
1006 (maybe-emit-operand-size-prefix segment size)
1007 (labels ((xchg-acc-with-something (acc something)
1008 (if (and (not (eq size :byte)) (register-p something))
1009 (emit-byte-with-reg segment
1011 (reg-tn-encoding something))
1012 (xchg-reg-with-something acc something)))
1013 (xchg-reg-with-something (reg something)
1014 (emit-byte segment (if (eq size :byte) #b10000110 #b10000111))
1015 (emit-ea segment something (reg-tn-encoding reg))))
1016 (cond ((accumulator-p operand1)
1017 (xchg-acc-with-something operand1 operand2))
1018 ((accumulator-p operand2)
1019 (xchg-acc-with-something operand2 operand1))
1020 ((register-p operand1)
1021 (xchg-reg-with-something operand1 operand2))
1022 ((register-p operand2)
1023 (xchg-reg-with-something operand2 operand1))
1025 (error "bogus args to XCHG: ~S ~S" operand1 operand2)))))))
1027 (define-instruction lea (segment dst src)
1028 (:printer reg-reg/mem ((op #b1000110) (width 1)))
1030 (assert (dword-reg-p dst))
1031 (emit-byte segment #b10001101)
1032 (emit-ea segment src (reg-tn-encoding dst))))
1034 (define-instruction cmpxchg (segment dst src)
1035 ;; Register/Memory with Register.
1036 (:printer ext-reg-reg/mem ((op #b1011000)) '(:name :tab reg/mem ", " reg))
1038 (assert (register-p src))
1039 (let ((size (matching-operand-size src dst)))
1040 (maybe-emit-operand-size-prefix segment size)
1041 (emit-byte segment #b00001111)
1042 (emit-byte segment (if (eq size :byte) #b10110000 #b10110001))
1043 (emit-ea segment dst (reg-tn-encoding src)))))
1046 ;;;; flag control instructions
1048 ;;; CLC -- Clear Carry Flag.
1049 (define-instruction clc (segment)
1050 (:printer byte ((op #b11111000)))
1052 (emit-byte segment #b11111000)))
1054 ;;; CLD -- Clear Direction Flag.
1055 (define-instruction cld (segment)
1056 (:printer byte ((op #b11111100)))
1058 (emit-byte segment #b11111100)))
1060 ;;; CLI -- Clear Iterrupt Enable Flag.
1061 (define-instruction cli (segment)
1062 (:printer byte ((op #b11111010)))
1064 (emit-byte segment #b11111010)))
1066 ;;; CMC -- Complement Carry Flag.
1067 (define-instruction cmc (segment)
1068 (:printer byte ((op #b11110101)))
1070 (emit-byte segment #b11110101)))
1072 ;;; LAHF -- Load AH into flags.
1073 (define-instruction lahf (segment)
1074 (:printer byte ((op #b10011111)))
1076 (emit-byte segment #b10011111)))
1078 ;;; POPF -- Pop flags.
1079 (define-instruction popf (segment)
1080 (:printer byte ((op #b10011101)))
1082 (emit-byte segment #b10011101)))
1084 ;;; PUSHF -- push flags.
1085 (define-instruction pushf (segment)
1086 (:printer byte ((op #b10011100)))
1088 (emit-byte segment #b10011100)))
1090 ;;; SAHF -- Store AH into flags.
1091 (define-instruction sahf (segment)
1092 (:printer byte ((op #b10011110)))
1094 (emit-byte segment #b10011110)))
1096 ;;; STC -- Set Carry Flag.
1097 (define-instruction stc (segment)
1098 (:printer byte ((op #b11111001)))
1100 (emit-byte segment #b11111001)))
1102 ;;; STD -- Set Direction Flag.
1103 (define-instruction std (segment)
1104 (:printer byte ((op #b11111101)))
1106 (emit-byte segment #b11111101)))
1108 ;;; STI -- Set Interrupt Enable Flag.
1109 (define-instruction sti (segment)
1110 (:printer byte ((op #b11111011)))
1112 (emit-byte segment #b11111011)))
1116 (defun emit-random-arith-inst (name segment dst src opcode
1117 &optional allow-constants)
1118 (let ((size (matching-operand-size dst src)))
1119 (maybe-emit-operand-size-prefix segment size)
1122 (cond ((and (not (eq size :byte)) (<= -128 src 127))
1123 (emit-byte segment #b10000011)
1124 (emit-ea segment dst opcode)
1125 (emit-byte segment src))
1126 ((accumulator-p dst)
1133 (emit-sized-immediate segment size src))
1135 (emit-byte segment (if (eq size :byte) #b10000000 #b10000001))
1136 (emit-ea segment dst opcode)
1137 (emit-sized-immediate segment size src))))
1142 (if (eq size :byte) #b00000000 #b00000001)))
1143 (emit-ea segment dst (reg-tn-encoding src) allow-constants))
1148 (if (eq size :byte) #b00000010 #b00000011)))
1149 (emit-ea segment src (reg-tn-encoding dst) allow-constants))
1151 (error "bogus operands to ~A" name)))))
1153 (eval-when (:compile-toplevel :execute)
1154 (defun arith-inst-printer-list (subop)
1155 `((accum-imm ((op ,(dpb subop (byte 3 2) #b0000010))))
1156 (reg/mem-imm ((op (#b1000000 ,subop))))
1157 (reg/mem-imm ((op (#b1000001 ,subop))
1158 (imm nil :type signed-imm-byte)))
1159 (reg-reg/mem-dir ((op ,(dpb subop (byte 3 1) #b000000))))))
1162 (define-instruction add (segment dst src)
1163 (:printer-list (arith-inst-printer-list #b000))
1164 (:emitter (emit-random-arith-inst "ADD" segment dst src #b000)))
1166 (define-instruction adc (segment dst src)
1167 (:printer-list (arith-inst-printer-list #b010))
1168 (:emitter (emit-random-arith-inst "ADC" segment dst src #b010)))
1170 (define-instruction sub (segment dst src)
1171 (:printer-list (arith-inst-printer-list #b101))
1172 (:emitter (emit-random-arith-inst "SUB" segment dst src #b101)))
1174 (define-instruction sbb (segment dst src)
1175 (:printer-list (arith-inst-printer-list #b011))
1176 (:emitter (emit-random-arith-inst "SBB" segment dst src #b011)))
1178 (define-instruction cmp (segment dst src)
1179 (:printer-list (arith-inst-printer-list #b111))
1180 (:emitter (emit-random-arith-inst "CMP" segment dst src #b111 t)))
1182 (define-instruction inc (segment dst)
1184 (:printer reg-no-width ((op #b01000)))
1186 (:printer reg/mem ((op '(#b1111111 #b000))))
1188 (let ((size (operand-size dst)))
1189 (maybe-emit-operand-size-prefix segment size)
1190 (cond ((and (not (eq size :byte)) (register-p dst))
1191 (emit-byte-with-reg segment #b01000 (reg-tn-encoding dst)))
1193 (emit-byte segment (if (eq size :byte) #b11111110 #b11111111))
1194 (emit-ea segment dst #b000))))))
1196 (define-instruction dec (segment dst)
1198 (:printer reg-no-width ((op #b01001)))
1200 (:printer reg/mem ((op '(#b1111111 #b001))))
1202 (let ((size (operand-size dst)))
1203 (maybe-emit-operand-size-prefix segment size)
1204 (cond ((and (not (eq size :byte)) (register-p dst))
1205 (emit-byte-with-reg segment #b01001 (reg-tn-encoding dst)))
1207 (emit-byte segment (if (eq size :byte) #b11111110 #b11111111))
1208 (emit-ea segment dst #b001))))))
1210 (define-instruction neg (segment dst)
1211 (:printer reg/mem ((op '(#b1111011 #b011))))
1213 (let ((size (operand-size dst)))
1214 (maybe-emit-operand-size-prefix segment size)
1215 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1216 (emit-ea segment dst #b011))))
1218 (define-instruction aaa (segment)
1219 (:printer byte ((op #b00110111)))
1221 (emit-byte segment #b00110111)))
1223 (define-instruction aas (segment)
1224 (:printer byte ((op #b00111111)))
1226 (emit-byte segment #b00111111)))
1228 (define-instruction daa (segment)
1229 (:printer byte ((op #b00100111)))
1231 (emit-byte segment #b00100111)))
1233 (define-instruction das (segment)
1234 (:printer byte ((op #b00101111)))
1236 (emit-byte segment #b00101111)))
1238 (define-instruction mul (segment dst src)
1239 (:printer accum-reg/mem ((op '(#b1111011 #b100))))
1241 (let ((size (matching-operand-size dst src)))
1242 (assert (accumulator-p dst))
1243 (maybe-emit-operand-size-prefix segment size)
1244 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1245 (emit-ea segment src #b100))))
1247 (define-instruction imul (segment dst &optional src1 src2)
1248 (:printer accum-reg/mem ((op '(#b1111011 #b101))))
1249 (:printer ext-reg-reg/mem ((op #b1010111)))
1250 (:printer reg-reg/mem ((op #b0110100) (width 1) (imm nil :type 'imm-word))
1251 '(:name :tab reg ", " reg/mem ", " imm))
1252 (:printer reg-reg/mem ((op #b0110101) (width 1)
1253 (imm nil :type 'signed-imm-byte))
1254 '(:name :tab reg ", " reg/mem ", " imm))
1256 (flet ((r/m-with-immed-to-reg (reg r/m immed)
1257 (let* ((size (matching-operand-size reg r/m))
1258 (sx (and (not (eq size :byte)) (<= -128 immed 127))))
1259 (maybe-emit-operand-size-prefix segment size)
1260 (emit-byte segment (if sx #b01101011 #b01101001))
1261 (emit-ea segment r/m (reg-tn-encoding reg))
1263 (emit-byte segment immed)
1264 (emit-sized-immediate segment size immed)))))
1266 (r/m-with-immed-to-reg dst src1 src2))
1269 (r/m-with-immed-to-reg dst dst src1)
1270 (let ((size (matching-operand-size dst src1)))
1271 (maybe-emit-operand-size-prefix segment size)
1272 (emit-byte segment #b00001111)
1273 (emit-byte segment #b10101111)
1274 (emit-ea segment src1 (reg-tn-encoding dst)))))
1276 (let ((size (operand-size dst)))
1277 (maybe-emit-operand-size-prefix segment size)
1278 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1279 (emit-ea segment dst #b101)))))))
1281 (define-instruction div (segment dst src)
1282 (:printer accum-reg/mem ((op '(#b1111011 #b110))))
1284 (let ((size (matching-operand-size dst src)))
1285 (assert (accumulator-p dst))
1286 (maybe-emit-operand-size-prefix segment size)
1287 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1288 (emit-ea segment src #b110))))
1290 (define-instruction idiv (segment dst src)
1291 (:printer accum-reg/mem ((op '(#b1111011 #b111))))
1293 (let ((size (matching-operand-size dst src)))
1294 (assert (accumulator-p dst))
1295 (maybe-emit-operand-size-prefix segment size)
1296 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1297 (emit-ea segment src #b111))))
1299 (define-instruction aad (segment)
1300 (:printer two-bytes ((op '(#b11010101 #b00001010))))
1302 (emit-byte segment #b11010101)
1303 (emit-byte segment #b00001010)))
1305 (define-instruction aam (segment)
1306 (:printer two-bytes ((op '(#b11010100 #b00001010))))
1308 (emit-byte segment #b11010100)
1309 (emit-byte segment #b00001010)))
1311 ;;; CBW -- Convert Byte to Word. AX <- sign_xtnd(AL)
1312 (define-instruction cbw (segment)
1314 (maybe-emit-operand-size-prefix segment :word)
1315 (emit-byte segment #b10011000)))
1317 ;;; CWDE -- Convert Word To Double Word Extened. EAX <- sign_xtnd(AX)
1318 (define-instruction cwde (segment)
1320 (maybe-emit-operand-size-prefix segment :dword)
1321 (emit-byte segment #b10011000)))
1323 ;;; CWD -- Convert Word to Double Word. DX:AX <- sign_xtnd(AX)
1324 (define-instruction cwd (segment)
1326 (maybe-emit-operand-size-prefix segment :word)
1327 (emit-byte segment #b10011001)))
1329 ;;; CDQ -- Convert Double Word to Quad Word. EDX:EAX <- sign_xtnd(EAX)
1330 (define-instruction cdq (segment)
1331 (:printer byte ((op #b10011001)))
1333 (maybe-emit-operand-size-prefix segment :dword)
1334 (emit-byte segment #b10011001)))
1336 (define-instruction xadd (segment dst src)
1337 ;; Register/Memory with Register.
1338 (:printer ext-reg-reg/mem ((op #b1100000)) '(:name :tab reg/mem ", " reg))
1340 (assert (register-p src))
1341 (let ((size (matching-operand-size src dst)))
1342 (maybe-emit-operand-size-prefix segment size)
1343 (emit-byte segment #b00001111)
1344 (emit-byte segment (if (eq size :byte) #b11000000 #b11000001))
1345 (emit-ea segment dst (reg-tn-encoding src)))))
1350 (defun emit-shift-inst (segment dst amount opcode)
1351 (let ((size (operand-size dst)))
1352 (maybe-emit-operand-size-prefix segment size)
1353 (multiple-value-bind (major-opcode immed)
1355 (:cl (values #b11010010 nil))
1356 (1 (values #b11010000 nil))
1357 (t (values #b11000000 t)))
1359 (if (eq size :byte) major-opcode (logior major-opcode 1)))
1360 (emit-ea segment dst opcode)
1362 (emit-byte segment amount)))))
1364 (eval-when (:compile-toplevel :execute)
1365 (defun shift-inst-printer-list (subop)
1366 `((reg/mem ((op (#b1101000 ,subop)))
1367 (:name :tab reg/mem ", 1"))
1368 (reg/mem ((op (#b1101001 ,subop)))
1369 (:name :tab reg/mem ", " 'cl))
1370 (reg/mem-imm ((op (#b1100000 ,subop))
1371 (imm nil :type signed-imm-byte))))))
1373 (define-instruction rol (segment dst amount)
1375 (shift-inst-printer-list #b000))
1377 (emit-shift-inst segment dst amount #b000)))
1379 (define-instruction ror (segment dst amount)
1381 (shift-inst-printer-list #b001))
1383 (emit-shift-inst segment dst amount #b001)))
1385 (define-instruction rcl (segment dst amount)
1387 (shift-inst-printer-list #b010))
1389 (emit-shift-inst segment dst amount #b010)))
1391 (define-instruction rcr (segment dst amount)
1393 (shift-inst-printer-list #b011))
1395 (emit-shift-inst segment dst amount #b011)))
1397 (define-instruction shl (segment dst amount)
1399 (shift-inst-printer-list #b100))
1401 (emit-shift-inst segment dst amount #b100)))
1403 (define-instruction shr (segment dst amount)
1405 (shift-inst-printer-list #b101))
1407 (emit-shift-inst segment dst amount #b101)))
1409 (define-instruction sar (segment dst amount)
1411 (shift-inst-printer-list #b111))
1413 (emit-shift-inst segment dst amount #b111)))
1415 (defun emit-double-shift (segment opcode dst src amt)
1416 (let ((size (matching-operand-size dst src)))
1417 (when (eq size :byte)
1418 (error "Double shifts can only be used with words."))
1419 (maybe-emit-operand-size-prefix segment size)
1420 (emit-byte segment #b00001111)
1421 (emit-byte segment (dpb opcode (byte 1 3)
1422 (if (eq amt :cl) #b10100101 #b10100100)))
1424 (emit-ea segment dst src)
1425 (emit-ea segment dst (reg-tn-encoding src)) ; pw tries this
1426 (unless (eq amt :cl)
1427 (emit-byte segment amt))))
1429 (eval-when (:compile-toplevel :execute)
1430 (defun double-shift-inst-printer-list (op)
1432 (ext-reg-reg/mem-imm ((op ,(logior op #b100))
1433 (imm nil :type signed-imm-byte)))
1434 (ext-reg-reg/mem ((op ,(logior op #b101)))
1435 (:name :tab reg/mem ", " 'cl)))))
1437 (define-instruction shld (segment dst src amt)
1438 (:declare (type (or (member :cl) (mod 32)) amt))
1439 (:printer-list (double-shift-inst-printer-list #b10100000))
1441 (emit-double-shift segment #b0 dst src amt)))
1443 (define-instruction shrd (segment dst src amt)
1444 (:declare (type (or (member :cl) (mod 32)) amt))
1445 (:printer-list (double-shift-inst-printer-list #b10101000))
1447 (emit-double-shift segment #b1 dst src amt)))
1449 (define-instruction and (segment dst src)
1451 (arith-inst-printer-list #b100))
1453 (emit-random-arith-inst "AND" segment dst src #b100)))
1455 (define-instruction test (segment this that)
1456 (:printer accum-imm ((op #b1010100)))
1457 (:printer reg/mem-imm ((op '(#b1111011 #b000))))
1458 (:printer reg-reg/mem ((op #b1000010)))
1460 (let ((size (matching-operand-size this that)))
1461 (maybe-emit-operand-size-prefix segment size)
1462 (flet ((test-immed-and-something (immed something)
1463 (cond ((accumulator-p something)
1465 (if (eq size :byte) #b10101000 #b10101001))
1466 (emit-sized-immediate segment size immed))
1469 (if (eq size :byte) #b11110110 #b11110111))
1470 (emit-ea segment something #b000)
1471 (emit-sized-immediate segment size immed))))
1472 (test-reg-and-something (reg something)
1473 (emit-byte segment (if (eq size :byte) #b10000100 #b10000101))
1474 (emit-ea segment something (reg-tn-encoding reg))))
1475 (cond ((integerp that)
1476 (test-immed-and-something that this))
1478 (test-immed-and-something this that))
1480 (test-reg-and-something this that))
1482 (test-reg-and-something that this))
1484 (error "bogus operands for TEST: ~S and ~S" this that)))))))
1486 (define-instruction or (segment dst src)
1488 (arith-inst-printer-list #b001))
1490 (emit-random-arith-inst "OR" segment dst src #b001)))
1492 (define-instruction xor (segment dst src)
1494 (arith-inst-printer-list #b110))
1496 (emit-random-arith-inst "XOR" segment dst src #b110)))
1498 (define-instruction not (segment dst)
1499 (:printer reg/mem ((op '(#b1111011 #b010))))
1501 (let ((size (operand-size dst)))
1502 (maybe-emit-operand-size-prefix segment size)
1503 (emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
1504 (emit-ea segment dst #b010))))
1506 ;;;; string manipulation
1508 (define-instruction cmps (segment size)
1509 (:printer string-op ((op #b1010011)))
1511 (maybe-emit-operand-size-prefix segment size)
1512 (emit-byte segment (if (eq size :byte) #b10100110 #b10100111))))
1514 (define-instruction ins (segment acc)
1515 (:printer string-op ((op #b0110110)))
1517 (let ((size (operand-size acc)))
1518 (assert (accumulator-p acc))
1519 (maybe-emit-operand-size-prefix segment size)
1520 (emit-byte segment (if (eq size :byte) #b01101100 #b01101101)))))
1522 (define-instruction lods (segment acc)
1523 (:printer string-op ((op #b1010110)))
1525 (let ((size (operand-size acc)))
1526 (assert (accumulator-p acc))
1527 (maybe-emit-operand-size-prefix segment size)
1528 (emit-byte segment (if (eq size :byte) #b10101100 #b10101101)))))
1530 (define-instruction movs (segment size)
1531 (:printer string-op ((op #b1010010)))
1533 (maybe-emit-operand-size-prefix segment size)
1534 (emit-byte segment (if (eq size :byte) #b10100100 #b10100101))))
1536 (define-instruction outs (segment acc)
1537 (:printer string-op ((op #b0110111)))
1539 (let ((size (operand-size acc)))
1540 (assert (accumulator-p acc))
1541 (maybe-emit-operand-size-prefix segment size)
1542 (emit-byte segment (if (eq size :byte) #b01101110 #b01101111)))))
1544 (define-instruction scas (segment acc)
1545 (:printer string-op ((op #b1010111)))
1547 (let ((size (operand-size acc)))
1548 (assert (accumulator-p acc))
1549 (maybe-emit-operand-size-prefix segment size)
1550 (emit-byte segment (if (eq size :byte) #b10101110 #b10101111)))))
1552 (define-instruction stos (segment acc)
1553 (:printer string-op ((op #b1010101)))
1555 (let ((size (operand-size acc)))
1556 (assert (accumulator-p acc))
1557 (maybe-emit-operand-size-prefix segment size)
1558 (emit-byte segment (if (eq size :byte) #b10101010 #b10101011)))))
1560 (define-instruction xlat (segment)
1561 (:printer byte ((op #b11010111)))
1563 (emit-byte segment #b11010111)))
1565 (define-instruction rep (segment)
1567 (emit-byte segment #b11110010)))
1569 (define-instruction repe (segment)
1570 (:printer byte ((op #b11110011)))
1572 (emit-byte segment #b11110011)))
1574 (define-instruction repne (segment)
1575 (:printer byte ((op #b11110010)))
1577 (emit-byte segment #b11110010)))
1580 ;;;; bit manipulation
1582 (define-instruction bsf (segment dst src)
1584 (let ((size (matching-operand-size dst src)))
1585 (when (eq size :byte)
1586 (error "can't scan bytes: ~S" src))
1587 (maybe-emit-operand-size-prefix segment size)
1588 (emit-byte segment #b00001111)
1589 (emit-byte segment #b10111100)
1590 (emit-ea segment src (reg-tn-encoding dst)))))
1592 (define-instruction bsr (segment dst src)
1594 (let ((size (matching-operand-size dst src)))
1595 (when (eq size :byte)
1596 (error "can't scan bytes: ~S" src))
1597 (maybe-emit-operand-size-prefix segment size)
1598 (emit-byte segment #b00001111)
1599 (emit-byte segment #b10111101)
1600 (emit-ea segment src (reg-tn-encoding dst)))))
1602 (defun emit-bit-test-and-mumble (segment src index opcode)
1603 (let ((size (operand-size src)))
1604 (when (eq size :byte)
1605 (error "can't scan bytes: ~S" src))
1606 (maybe-emit-operand-size-prefix segment size)
1607 (emit-byte segment #b00001111)
1608 (cond ((integerp index)
1609 (emit-byte segment #b10111010)
1610 (emit-ea segment src opcode)
1611 (emit-byte segment index))
1613 (emit-byte segment (dpb opcode (byte 3 3) #b10000011))
1614 (emit-ea segment src (reg-tn-encoding index))))))
1616 (define-instruction bt (segment src index)
1618 (emit-bit-test-and-mumble segment src index #b100)))
1620 (define-instruction btc (segment src index)
1622 (emit-bit-test-and-mumble segment src index #b111)))
1624 (define-instruction btr (segment src index)
1626 (emit-bit-test-and-mumble segment src index #b110)))
1628 (define-instruction bts (segment src index)
1630 (emit-bit-test-and-mumble segment src index #b101)))
1633 ;;;; control transfer
1635 (define-instruction call (segment where)
1636 (:printer near-jump ((op #b11101000)))
1637 (:printer reg/mem ((op '(#b1111111 #b010)) (width 1)))
1641 (emit-byte segment #b11101000)
1642 (emit-back-patch segment
1644 #'(lambda (segment posn)
1646 (- (label-position where)
1649 (emit-byte segment #b11101000)
1650 (emit-relative-fixup segment where))
1652 (emit-byte segment #b11111111)
1653 (emit-ea segment where #b010)))))
1655 (defun emit-byte-displacement-backpatch (segment target)
1656 (emit-back-patch segment
1658 #'(lambda (segment posn)
1659 (let ((disp (- (label-position target) (1+ posn))))
1660 (assert (<= -128 disp 127))
1661 (emit-byte segment disp)))))
1663 (define-instruction jmp (segment cond &optional where)
1664 ;; conditional jumps
1665 (:printer short-cond-jump ((op #b0111)) '('j cc :tab label))
1666 (:printer near-cond-jump () '('j cc :tab label))
1667 ;; unconditional jumps
1668 (:printer short-jump ((op #b1011)))
1669 (:printer near-jump ((op #b11101001)) )
1670 (:printer reg/mem ((op '(#b1111111 #b100)) (width 1)))
1675 #'(lambda (segment posn delta-if-after)
1676 (let ((disp (- (label-position where posn delta-if-after)
1678 (when (<= -128 disp 127)
1680 (dpb (conditional-opcode cond)
1683 (emit-byte-displacement-backpatch segment where)
1685 #'(lambda (segment posn)
1686 (let ((disp (- (label-position where) (+ posn 6))))
1687 (emit-byte segment #b00001111)
1689 (dpb (conditional-opcode cond)
1692 (emit-dword segment disp)))))
1693 ((label-p (setq where cond))
1696 #'(lambda (segment posn delta-if-after)
1697 (let ((disp (- (label-position where posn delta-if-after)
1699 (when (<= -128 disp 127)
1700 (emit-byte segment #b11101011)
1701 (emit-byte-displacement-backpatch segment where)
1703 #'(lambda (segment posn)
1704 (let ((disp (- (label-position where) (+ posn 5))))
1705 (emit-byte segment #b11101001)
1706 (emit-dword segment disp))
1709 (emit-byte segment #b11101001)
1710 (emit-relative-fixup segment where))
1712 (unless (or (ea-p where) (tn-p where))
1713 (error "don't know what to do with ~A" where))
1714 (emit-byte segment #b11111111)
1715 (emit-ea segment where #b100)))))
1717 (define-instruction jmp-short (segment label)
1719 (emit-byte segment #b11101011)
1720 (emit-byte-displacement-backpatch segment label)))
1722 (define-instruction ret (segment &optional stack-delta)
1723 (:printer byte ((op #b11000011)))
1724 (:printer byte ((op #b11000010) (imm nil :type 'imm-word-16))
1728 (emit-byte segment #b11000010)
1729 (emit-word segment stack-delta))
1731 (emit-byte segment #b11000011)))))
1733 (define-instruction jecxz (segment target)
1734 (:printer short-jump ((op #b0011)))
1736 (emit-byte segment #b11100011)
1737 (emit-byte-displacement-backpatch segment target)))
1739 (define-instruction loop (segment target)
1740 (:printer short-jump ((op #b0010)))
1742 (emit-byte segment #b11100010) ; pfw this was 11100011, or jecxz!!!!
1743 (emit-byte-displacement-backpatch segment target)))
1745 (define-instruction loopz (segment target)
1746 (:printer short-jump ((op #b0001)))
1748 (emit-byte segment #b11100001)
1749 (emit-byte-displacement-backpatch segment target)))
1751 (define-instruction loopnz (segment target)
1752 (:printer short-jump ((op #b0000)))
1754 (emit-byte segment #b11100000)
1755 (emit-byte-displacement-backpatch segment target)))
1757 ;;;; conditional byte set
1759 (define-instruction set (segment dst cond)
1760 (:printer cond-set ())
1762 (emit-byte segment #b00001111)
1763 (emit-byte segment (dpb (conditional-opcode cond) (byte 4 0) #b10010000))
1764 (emit-ea segment dst #b000)))
1768 (define-instruction enter (segment disp &optional (level 0))
1769 (:declare (type (unsigned-byte 16) disp)
1770 (type (unsigned-byte 8) level))
1771 (:printer enter-format ((op #b11001000)))
1773 (emit-byte segment #b11001000)
1774 (emit-word segment disp)
1775 (emit-byte segment level)))
1777 (define-instruction leave (segment)
1778 (:printer byte ((op #b11001001)))
1780 (emit-byte segment #b11001001)))
1782 ;;;; interrupt instructions
1784 (defun snarf-error-junk (sap offset &optional length-only)
1785 (let* ((length (sb!sys:sap-ref-8 sap offset))
1786 (vector (make-array length :element-type '(unsigned-byte 8))))
1787 (declare (type sb!sys:system-area-pointer sap)
1788 (type (unsigned-byte 8) length)
1789 (type (simple-array (unsigned-byte 8) (*)) vector))
1791 (values 0 (1+ length) nil nil))
1793 (sb!kernel:copy-from-system-area sap (* byte-bits (1+ offset))
1796 (* length byte-bits))
1797 (collect ((sc-offsets)
1799 (lengths 1) ; the length byte
1801 (error-number (sb!c::read-var-integer vector index)))
1804 (when (>= index length)
1806 (let ((old-index index))
1807 (sc-offsets (sb!c::read-var-integer vector index))
1808 (lengths (- index old-index))))
1809 (values error-number
1815 (defmacro break-cases (breaknum &body cases)
1816 (let ((bn-temp (gensym)))
1817 (collect ((clauses))
1818 (dolist (case cases)
1819 (clauses `((= ,bn-temp ,(car case)) ,@(cdr case))))
1820 `(let ((,bn-temp ,breaknum))
1821 (cond ,@(clauses))))))
1824 (defun break-control (chunk inst stream dstate)
1825 (declare (ignore inst))
1826 (flet ((nt (x) (if stream (sb!disassem:note x dstate))))
1827 ;; FIXME: Make sure that BYTE-IMM-CODE is defined. The genesis
1828 ;; map has it undefined; and it should be easier to look in the target
1829 ;; Lisp (with (DESCRIBE 'BYTE-IMM-CODE)) than to definitively deduce
1830 ;; from first principles whether it's defined in some way that genesis
1832 (case (byte-imm-code chunk dstate)
1835 (sb!disassem:handle-break-args #'snarf-error-junk stream dstate))
1836 (#.sb!vm:cerror-trap
1838 (sb!disassem:handle-break-args #'snarf-error-junk stream dstate))
1839 (#.sb!vm:breakpoint-trap
1840 (nt "breakpoint trap"))
1841 (#.sb!vm:pending-interrupt-trap
1842 (nt "pending interrupt trap"))
1845 (#.sb!vm:function-end-breakpoint-trap
1846 (nt "function end breakpoint trap")))))
1848 (define-instruction break (segment code)
1849 (:declare (type (unsigned-byte 8) code))
1850 (:printer byte-imm ((op #b11001100)) '(:name :tab code)
1851 :control #'break-control)
1853 (emit-byte segment #b11001100)
1854 (emit-byte segment code)))
1856 (define-instruction int (segment number)
1857 (:declare (type (unsigned-byte 8) number))
1858 (:printer byte-imm ((op #b11001101)))
1862 (emit-byte segment #b11001100))
1864 (emit-byte segment #b11001101)
1865 (emit-byte segment number)))))
1867 (define-instruction into (segment)
1868 (:printer byte ((op #b11001110)))
1870 (emit-byte segment #b11001110)))
1872 (define-instruction bound (segment reg bounds)
1874 (let ((size (matching-operand-size reg bounds)))
1875 (when (eq size :byte)
1876 (error "can't bounds-test bytes: ~S" reg))
1877 (maybe-emit-operand-size-prefix segment size)
1878 (emit-byte segment #b01100010)
1879 (emit-ea segment bounds (reg-tn-encoding reg)))))
1881 (define-instruction iret (segment)
1882 (:printer byte ((op #b11001111)))
1884 (emit-byte segment #b11001111)))
1886 ;;;; processor control
1888 (define-instruction hlt (segment)
1889 (:printer byte ((op #b11110100)))
1891 (emit-byte segment #b11110100)))
1893 (define-instruction nop (segment)
1894 (:printer byte ((op #b10010000)))
1896 (emit-byte segment #b10010000)))
1898 (define-instruction wait (segment)
1899 (:printer byte ((op #b10011011)))
1901 (emit-byte segment #b10011011)))
1903 (define-instruction lock (segment)
1904 (:printer byte ((op #b11110000)))
1906 (emit-byte segment #b11110000)))
1908 ;;;; miscellaneous hackery
1910 (define-instruction byte (segment byte)
1912 (emit-byte segment byte)))
1914 (define-instruction word (segment word)
1916 (emit-word segment word)))
1918 (define-instruction dword (segment dword)
1920 (emit-dword segment dword)))
1922 (defun emit-header-data (segment type)
1923 (emit-back-patch segment
1925 (lambda (segment posn)
1929 (component-header-length))
1933 (define-instruction function-header-word (segment)
1935 (emit-header-data segment function-header-type)))
1937 (define-instruction lra-header-word (segment)
1939 (emit-header-data segment return-pc-header-type)))
1941 ;;;; fp instructions
1943 ;;;; FIXME: This section said "added by jrd", which should end up in CREDITS.
1945 ;;;; Note: We treat the single-precision and double-precision variants
1946 ;;;; as separate instructions.
1948 ;;; Load single to st(0).
1949 (define-instruction fld (segment source)
1950 (:printer floating-point ((op '(#b001 #b000))))
1952 (emit-byte segment #b11011001)
1953 (emit-fp-op segment source #b000)))
1955 ;;; Load double to st(0).
1956 (define-instruction fldd (segment source)
1957 (:printer floating-point ((op '(#b101 #b000))))
1958 (:printer floating-point-fp ((op '(#b001 #b000))))
1960 (if (fp-reg-tn-p source)
1961 (emit-byte segment #b11011001)
1962 (emit-byte segment #b11011101))
1963 (emit-fp-op segment source #b000)))
1965 ;;; Load long to st(0).
1966 (define-instruction fldl (segment source)
1967 (:printer floating-point ((op '(#b011 #b101))))
1969 (emit-byte segment #b11011011)
1970 (emit-fp-op segment source #b101)))
1972 ;;; Store single from st(0).
1973 (define-instruction fst (segment dest)
1974 (:printer floating-point ((op '(#b001 #b010))))
1976 (cond ((fp-reg-tn-p dest)
1977 (emit-byte segment #b11011101)
1978 (emit-fp-op segment dest #b010))
1980 (emit-byte segment #b11011001)
1981 (emit-fp-op segment dest #b010)))))
1983 ;;; Store double from st(0).
1984 (define-instruction fstd (segment dest)
1985 (:printer floating-point ((op '(#b101 #b010))))
1986 (:printer floating-point-fp ((op '(#b101 #b010))))
1988 (cond ((fp-reg-tn-p dest)
1989 (emit-byte segment #b11011101)
1990 (emit-fp-op segment dest #b010))
1992 (emit-byte segment #b11011101)
1993 (emit-fp-op segment dest #b010)))))
1995 ;;; Arithmetic ops are all done with at least one operand at top of
1996 ;;; stack. The other operand is is another register or a 32/64 bit
1999 ;;; dtc: I've tried to follow the Intel ASM386 conventions, but note
2000 ;;; that these conflict with the Gdb conventions for binops. To reduce
2001 ;;; the confusion I've added comments showing the mathamatical
2002 ;;; operation and the two syntaxes. By the ASM386 convention the
2003 ;;; instruction syntax is:
2006 ;;; or Fop Destination, Source
2008 ;;; If only one operand is given then it is the source and the
2009 ;;; destination is ST(0). There are reversed forms of the fsub and
2010 ;;; fdiv instructions inducated by an 'R' suffix.
2012 ;;; The mathematical operation for the non-reverse form is always:
2013 ;;; destination = destination op source
2015 ;;; For the reversed form it is:
2016 ;;; destination = source op destination
2018 ;;; The instructions below only accept one operand at present which is
2019 ;;; usually the source. I've hack in extra instructions to implement
2020 ;;; the fops with a ST(i) destination, these have a -sti suffix and
2021 ;;; the operand is the destination with the source being ST(0).
2024 ;;; st(0) = st(0) + memory or st(i).
2025 (define-instruction fadd (segment source)
2026 (:printer floating-point ((op '(#b000 #b000))))
2028 (emit-byte segment #b11011000)
2029 (emit-fp-op segment source #b000)))
2032 ;;; st(0) = st(0) + memory or st(i).
2033 (define-instruction faddd (segment source)
2034 (:printer floating-point ((op '(#b100 #b000))))
2035 (:printer floating-point-fp ((op '(#b000 #b000))))
2037 (if (fp-reg-tn-p source)
2038 (emit-byte segment #b11011000)
2039 (emit-byte segment #b11011100))
2040 (emit-fp-op segment source #b000)))
2042 ;;; Add double destination st(i):
2043 ;;; st(i) = st(0) + st(i).
2044 (define-instruction fadd-sti (segment destination)
2045 (:printer floating-point-fp ((op '(#b100 #b000))))
2047 (assert (fp-reg-tn-p destination))
2048 (emit-byte segment #b11011100)
2049 (emit-fp-op segment destination #b000)))
2051 (define-instruction faddp-sti (segment destination)
2052 (:printer floating-point-fp ((op '(#b110 #b000))))
2054 (assert (fp-reg-tn-p destination))
2055 (emit-byte segment #b11011110)
2056 (emit-fp-op segment destination #b000)))
2058 ;;; Subtract single:
2059 ;;; st(0) = st(0) - memory or st(i).
2060 (define-instruction fsub (segment source)
2061 (:printer floating-point ((op '(#b000 #b100))))
2063 (emit-byte segment #b11011000)
2064 (emit-fp-op segment source #b100)))
2066 ;;; Subtract single, reverse:
2067 ;;; st(0) = memory or st(i) - st(0).
2068 (define-instruction fsubr (segment source)
2069 (:printer floating-point ((op '(#b000 #b101))))
2071 (emit-byte segment #b11011000)
2072 (emit-fp-op segment source #b101)))
2074 ;;; Subtract double:
2075 ;;; st(0) = st(0) - memory or st(i).
2076 (define-instruction fsubd (segment source)
2077 (:printer floating-point ((op '(#b100 #b100))))
2078 (:printer floating-point-fp ((op '(#b000 #b100))))
2080 (if (fp-reg-tn-p source)
2081 (emit-byte segment #b11011000)
2082 (emit-byte segment #b11011100))
2083 (emit-fp-op segment source #b100)))
2085 ;;; Subtract double, reverse:
2086 ;;; st(0) = memory or st(i) - st(0).
2087 (define-instruction fsubrd (segment source)
2088 (:printer floating-point ((op '(#b100 #b101))))
2089 (:printer floating-point-fp ((op '(#b000 #b101))))
2091 (if (fp-reg-tn-p source)
2092 (emit-byte segment #b11011000)
2093 (emit-byte segment #b11011100))
2094 (emit-fp-op segment source #b101)))
2096 ;;; Subtract double, destination st(i):
2097 ;;; st(i) = st(i) - st(0).
2099 ;;; ASM386 syntax: FSUB ST(i), ST
2100 ;;; Gdb syntax: fsubr %st,%st(i)
2101 (define-instruction fsub-sti (segment destination)
2102 (:printer floating-point-fp ((op '(#b100 #b101))))
2104 (assert (fp-reg-tn-p destination))
2105 (emit-byte segment #b11011100)
2106 (emit-fp-op segment destination #b101)))
2108 (define-instruction fsubp-sti (segment destination)
2109 (:printer floating-point-fp ((op '(#b110 #b101))))
2111 (assert (fp-reg-tn-p destination))
2112 (emit-byte segment #b11011110)
2113 (emit-fp-op segment destination #b101)))
2115 ;;; Subtract double, reverse, destination st(i):
2116 ;;; st(i) = st(0) - st(i).
2118 ;;; ASM386 syntax: FSUBR ST(i), ST
2119 ;;; Gdb syntax: fsub %st,%st(i)
2120 (define-instruction fsubr-sti (segment destination)
2121 (:printer floating-point-fp ((op '(#b100 #b100))))
2123 (assert (fp-reg-tn-p destination))
2124 (emit-byte segment #b11011100)
2125 (emit-fp-op segment destination #b100)))
2127 (define-instruction fsubrp-sti (segment destination)
2128 (:printer floating-point-fp ((op '(#b110 #b100))))
2130 (assert (fp-reg-tn-p destination))
2131 (emit-byte segment #b11011110)
2132 (emit-fp-op segment destination #b100)))
2134 ;;; Multiply single:
2135 ;;; st(0) = st(0) * memory or st(i).
2136 (define-instruction fmul (segment source)
2137 (:printer floating-point ((op '(#b000 #b001))))
2139 (emit-byte segment #b11011000)
2140 (emit-fp-op segment source #b001)))
2142 ;;; Multiply double:
2143 ;;; st(0) = st(0) * memory or st(i).
2144 (define-instruction fmuld (segment source)
2145 (:printer floating-point ((op '(#b100 #b001))))
2146 (:printer floating-point-fp ((op '(#b000 #b001))))
2148 (if (fp-reg-tn-p source)
2149 (emit-byte segment #b11011000)
2150 (emit-byte segment #b11011100))
2151 (emit-fp-op segment source #b001)))
2153 ;;; Multiply double, destination st(i):
2154 ;;; st(i) = st(i) * st(0).
2155 (define-instruction fmul-sti (segment destination)
2156 (:printer floating-point-fp ((op '(#b100 #b001))))
2158 (assert (fp-reg-tn-p destination))
2159 (emit-byte segment #b11011100)
2160 (emit-fp-op segment destination #b001)))
2163 ;;; st(0) = st(0) / memory or st(i).
2164 (define-instruction fdiv (segment source)
2165 (:printer floating-point ((op '(#b000 #b110))))
2167 (emit-byte segment #b11011000)
2168 (emit-fp-op segment source #b110)))
2170 ;;; Divide single, reverse:
2171 ;;; st(0) = memory or st(i) / st(0).
2172 (define-instruction fdivr (segment source)
2173 (:printer floating-point ((op '(#b000 #b111))))
2175 (emit-byte segment #b11011000)
2176 (emit-fp-op segment source #b111)))
2179 ;;; st(0) = st(0) / memory or st(i).
2180 (define-instruction fdivd (segment source)
2181 (:printer floating-point ((op '(#b100 #b110))))
2182 (:printer floating-point-fp ((op '(#b000 #b110))))
2184 (if (fp-reg-tn-p source)
2185 (emit-byte segment #b11011000)
2186 (emit-byte segment #b11011100))
2187 (emit-fp-op segment source #b110)))
2189 ;;; Divide double, reverse:
2190 ;;; st(0) = memory or st(i) / st(0).
2191 (define-instruction fdivrd (segment source)
2192 (:printer floating-point ((op '(#b100 #b111))))
2193 (:printer floating-point-fp ((op '(#b000 #b111))))
2195 (if (fp-reg-tn-p source)
2196 (emit-byte segment #b11011000)
2197 (emit-byte segment #b11011100))
2198 (emit-fp-op segment source #b111)))
2200 ;;; Divide double, destination st(i):
2201 ;;; st(i) = st(i) / st(0).
2203 ;;; ASM386 syntax: FDIV ST(i), ST
2204 ;;; Gdb syntax: fdivr %st,%st(i)
2205 (define-instruction fdiv-sti (segment destination)
2206 (:printer floating-point-fp ((op '(#b100 #b111))))
2208 (assert (fp-reg-tn-p destination))
2209 (emit-byte segment #b11011100)
2210 (emit-fp-op segment destination #b111)))
2212 ;;; Divide double, reverse, destination st(i):
2213 ;;; st(i) = st(0) / st(i).
2215 ;;; ASM386 syntax: FDIVR ST(i), ST
2216 ;;; Gdb syntax: fdiv %st,%st(i)
2217 (define-instruction fdivr-sti (segment destination)
2218 (:printer floating-point-fp ((op '(#b100 #b110))))
2220 (assert (fp-reg-tn-p destination))
2221 (emit-byte segment #b11011100)
2222 (emit-fp-op segment destination #b110)))
2224 ;;; Exchange fr0 with fr(n). (There is no double precision variant.)
2225 (define-instruction fxch (segment source)
2226 (:printer floating-point-fp ((op '(#b001 #b001))))
2228 (unless (and (tn-p source)
2229 (eq (sb-name (sc-sb (tn-sc source))) 'float-registers))
2231 (emit-byte segment #b11011001)
2232 (emit-fp-op segment source #b001)))
2234 ;;; Push 32-bit integer to st0.
2235 (define-instruction fild (segment source)
2236 (:printer floating-point ((op '(#b011 #b000))))
2238 (emit-byte segment #b11011011)
2239 (emit-fp-op segment source #b000)))
2241 ;;; Push 64-bit integer to st0.
2242 (define-instruction fildl (segment source)
2243 (:printer floating-point ((op '(#b111 #b101))))
2245 (emit-byte segment #b11011111)
2246 (emit-fp-op segment source #b101)))
2248 ;;; Store 32-bit integer.
2249 (define-instruction fist (segment dest)
2250 (:printer floating-point ((op '(#b011 #b010))))
2252 (emit-byte segment #b11011011)
2253 (emit-fp-op segment dest #b010)))
2255 ;;; Store and pop 32-bit integer.
2256 (define-instruction fistp (segment dest)
2257 (:printer floating-point ((op '(#b011 #b011))))
2259 (emit-byte segment #b11011011)
2260 (emit-fp-op segment dest #b011)))
2262 ;;; Store and pop 64-bit integer.
2263 (define-instruction fistpl (segment dest)
2264 (:printer floating-point ((op '(#b111 #b111))))
2266 (emit-byte segment #b11011111)
2267 (emit-fp-op segment dest #b111)))
2269 ;;; Store single from st(0) and pop.
2270 (define-instruction fstp (segment dest)
2271 (:printer floating-point ((op '(#b001 #b011))))
2273 (cond ((fp-reg-tn-p dest)
2274 (emit-byte segment #b11011101)
2275 (emit-fp-op segment dest #b011))
2277 (emit-byte segment #b11011001)
2278 (emit-fp-op segment dest #b011)))))
2280 ;;; Store double from st(0) and pop.
2281 (define-instruction fstpd (segment dest)
2282 (:printer floating-point ((op '(#b101 #b011))))
2283 (:printer floating-point-fp ((op '(#b101 #b011))))
2285 (cond ((fp-reg-tn-p dest)
2286 (emit-byte segment #b11011101)
2287 (emit-fp-op segment dest #b011))
2289 (emit-byte segment #b11011101)
2290 (emit-fp-op segment dest #b011)))))
2292 ;;; Store long from st(0) and pop.
2293 (define-instruction fstpl (segment dest)
2294 (:printer floating-point ((op '(#b011 #b111))))
2296 (emit-byte segment #b11011011)
2297 (emit-fp-op segment dest #b111)))
2299 ;;; Decrement stack-top pointer.
2300 (define-instruction fdecstp (segment)
2301 (:printer floating-point-no ((op #b10110)))
2303 (emit-byte segment #b11011001)
2304 (emit-byte segment #b11110110)))
2306 ;;; Increment stack-top pointer.
2307 (define-instruction fincstp (segment)
2308 (:printer floating-point-no ((op #b10111)))
2310 (emit-byte segment #b11011001)
2311 (emit-byte segment #b11110111)))
2313 ;;; Free fp register.
2314 (define-instruction ffree (segment dest)
2315 (:printer floating-point-fp ((op '(#b101 #b000))))
2317 (emit-byte segment #b11011101)
2318 (emit-fp-op segment dest #b000)))
2320 (define-instruction fabs (segment)
2321 (:printer floating-point-no ((op #b00001)))
2323 (emit-byte segment #b11011001)
2324 (emit-byte segment #b11100001)))
2326 (define-instruction fchs (segment)
2327 (:printer floating-point-no ((op #b00000)))
2329 (emit-byte segment #b11011001)
2330 (emit-byte segment #b11100000)))
2332 (define-instruction frndint(segment)
2333 (:printer floating-point-no ((op #b11100)))
2335 (emit-byte segment #b11011001)
2336 (emit-byte segment #b11111100)))
2339 (define-instruction fninit(segment)
2340 (:printer floating-point-5 ((op #b00011)))
2342 (emit-byte segment #b11011011)
2343 (emit-byte segment #b11100011)))
2345 ;;; Store Status Word to AX.
2346 (define-instruction fnstsw(segment)
2347 (:printer floating-point-st ((op #b00000)))
2349 (emit-byte segment #b11011111)
2350 (emit-byte segment #b11100000)))
2352 ;;; Load Control Word.
2354 ;;; src must be a memory location
2355 (define-instruction fldcw(segment src)
2356 (:printer floating-point ((op '(#b001 #b101))))
2358 (emit-byte segment #b11011001)
2359 (emit-fp-op segment src #b101)))
2361 ;;; Store Control Word.
2362 (define-instruction fnstcw(segment dst)
2363 (:printer floating-point ((op '(#b001 #b111))))
2365 (emit-byte segment #b11011001)
2366 (emit-fp-op segment dst #b111)))
2368 ;;; Store FP Environment.
2369 (define-instruction fstenv(segment dst)
2370 (:printer floating-point ((op '(#b001 #b110))))
2372 (emit-byte segment #b11011001)
2373 (emit-fp-op segment dst #b110)))
2375 ;;; Restore FP Environment.
2376 (define-instruction fldenv(segment src)
2377 (:printer floating-point ((op '(#b001 #b100))))
2379 (emit-byte segment #b11011001)
2380 (emit-fp-op segment src #b100)))
2383 (define-instruction fsave(segment dst)
2384 (:printer floating-point ((op '(#b101 #b110))))
2386 (emit-byte segment #b11011101)
2387 (emit-fp-op segment dst #b110)))
2389 ;;; Restore FP State.
2390 (define-instruction frstor(segment src)
2391 (:printer floating-point ((op '(#b101 #b100))))
2393 (emit-byte segment #b11011101)
2394 (emit-fp-op segment src #b100)))
2396 ;;; Clear exceptions.
2397 (define-instruction fnclex(segment)
2398 (:printer floating-point-5 ((op #b00010)))
2400 (emit-byte segment #b11011011)
2401 (emit-byte segment #b11100010)))
2404 (define-instruction fcom (segment src)
2405 (:printer floating-point ((op '(#b000 #b010))))
2407 (emit-byte segment #b11011000)
2408 (emit-fp-op segment src #b010)))
2410 (define-instruction fcomd (segment src)
2411 (:printer floating-point ((op '(#b100 #b010))))
2412 (:printer floating-point-fp ((op '(#b000 #b010))))
2414 (if (fp-reg-tn-p src)
2415 (emit-byte segment #b11011000)
2416 (emit-byte segment #b11011100))
2417 (emit-fp-op segment src #b010)))
2419 ;;; Compare ST1 to ST0, popping the stack twice.
2420 (define-instruction fcompp (segment)
2421 (:printer floating-point-3 ((op '(#b110 #b011001))))
2423 (emit-byte segment #b11011110)
2424 (emit-byte segment #b11011001)))
2426 ;;; unordered comparison
2427 (define-instruction fucom (segment src)
2428 ;; XX Printer conflicts with frstor
2429 ;; (:printer floating-point ((op '(#b101 #b100))))
2431 (assert (fp-reg-tn-p src))
2432 (emit-byte segment #b11011101)
2433 (emit-fp-op segment src #b100)))
2435 (define-instruction ftst (segment)
2436 (:printer floating-point-no ((op #b00100)))
2438 (emit-byte segment #b11011001)
2439 (emit-byte segment #b11100100)))
2443 (define-instruction fsqrt(segment)
2444 (:printer floating-point-no ((op #b11010)))
2446 (emit-byte segment #b11011001)
2447 (emit-byte segment #b11111010)))
2449 (define-instruction fscale(segment)
2450 (:printer floating-point-no ((op #b11101)))
2452 (emit-byte segment #b11011001)
2453 (emit-byte segment #b11111101)))
2455 (define-instruction fxtract(segment)
2456 (:printer floating-point-no ((op #b10100)))
2458 (emit-byte segment #b11011001)
2459 (emit-byte segment #b11110100)))
2461 (define-instruction fsin(segment)
2462 (:printer floating-point-no ((op #b11110)))
2464 (emit-byte segment #b11011001)
2465 (emit-byte segment #b11111110)))
2467 (define-instruction fcos(segment)
2468 (:printer floating-point-no ((op #b11111)))
2470 (emit-byte segment #b11011001)
2471 (emit-byte segment #b11111111)))
2473 (define-instruction fprem1(segment)
2474 (:printer floating-point-no ((op #b10101)))
2476 (emit-byte segment #b11011001)
2477 (emit-byte segment #b11110101)))
2479 (define-instruction fprem(segment)
2480 (:printer floating-point-no ((op #b11000)))
2482 (emit-byte segment #b11011001)
2483 (emit-byte segment #b11111000)))
2485 (define-instruction fxam (segment)
2486 (:printer floating-point-no ((op #b00101)))
2488 (emit-byte segment #b11011001)
2489 (emit-byte segment #b11100101)))
2491 ;;; These do push/pop to stack and need special handling
2492 ;;; in any VOPs that use them. See the book.
2494 ;;; st0 <- st1*log2(st0)
2495 (define-instruction fyl2x(segment) ; pops stack
2496 (:printer floating-point-no ((op #b10001)))
2498 (emit-byte segment #b11011001)
2499 (emit-byte segment #b11110001)))
2501 (define-instruction fyl2xp1(segment)
2502 (:printer floating-point-no ((op #b11001)))
2504 (emit-byte segment #b11011001)
2505 (emit-byte segment #b11111001)))
2507 (define-instruction f2xm1(segment)
2508 (:printer floating-point-no ((op #b10000)))
2510 (emit-byte segment #b11011001)
2511 (emit-byte segment #b11110000)))
2513 (define-instruction fptan(segment) ; st(0) <- 1; st(1) <- tan
2514 (:printer floating-point-no ((op #b10010)))
2516 (emit-byte segment #b11011001)
2517 (emit-byte segment #b11110010)))
2519 (define-instruction fpatan(segment) ; POPS STACK
2520 (:printer floating-point-no ((op #b10011)))
2522 (emit-byte segment #b11011001)
2523 (emit-byte segment #b11110011)))
2525 ;;;; loading constants
2527 (define-instruction fldz(segment)
2528 (:printer floating-point-no ((op #b01110)))
2530 (emit-byte segment #b11011001)
2531 (emit-byte segment #b11101110)))
2533 (define-instruction fld1(segment)
2534 (:printer floating-point-no ((op #b01000)))
2536 (emit-byte segment #b11011001)
2537 (emit-byte segment #b11101000)))
2539 (define-instruction fldpi(segment)
2540 (:printer floating-point-no ((op #b01011)))
2542 (emit-byte segment #b11011001)
2543 (emit-byte segment #b11101011)))
2545 (define-instruction fldl2t(segment)
2546 (:printer floating-point-no ((op #b01001)))
2548 (emit-byte segment #b11011001)
2549 (emit-byte segment #b11101001)))
2551 (define-instruction fldl2e(segment)
2552 (:printer floating-point-no ((op #b01010)))
2554 (emit-byte segment #b11011001)
2555 (emit-byte segment #b11101010)))
2557 (define-instruction fldlg2(segment)
2558 (:printer floating-point-no ((op #b01100)))
2560 (emit-byte segment #b11011001)
2561 (emit-byte segment #b11101100)))
2563 (define-instruction fldln2(segment)
2564 (:printer floating-point-no ((op #b01101)))
2566 (emit-byte segment #b11011001)
2567 (emit-byte segment #b11101101)))