1 ;;;; SAP operations for the x86 VM
3 ;;;; This software is part of the SBCL system. See the README file for
6 ;;;; This software is derived from the CMU CL system, which was
7 ;;;; written at Carnegie Mellon University and released into the
8 ;;;; public domain. The software is in the public domain and is
9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
10 ;;;; files for more information.
14 ;;;; moves and coercions
16 ;;; Move a tagged SAP to an untagged representation.
17 (define-vop (move-to-sap)
18 (:args (x :scs (descriptor-reg)))
19 (:results (y :scs (sap-reg)))
20 (:note "pointer to SAP coercion")
22 (loadw y x sap-pointer-slot other-pointer-lowtag)))
23 (define-move-vop move-to-sap :move
24 (descriptor-reg) (sap-reg))
26 ;;; Move an untagged SAP to a tagged representation.
27 (define-vop (move-from-sap)
28 (:args (sap :scs (sap-reg) :to :result))
29 (:results (res :scs (descriptor-reg) :from :argument))
30 (:note "SAP to pointer coercion")
33 (with-fixed-allocation (res sap-widetag sap-size node)
34 (storew sap res sap-pointer-slot other-pointer-lowtag))))
35 (define-move-vop move-from-sap :move
36 (sap-reg) (descriptor-reg))
38 ;;; Move untagged sap values.
39 (define-vop (sap-move)
42 :load-if (not (location= x y))))
43 (:results (y :scs (sap-reg)
44 :load-if (not (location= x y))))
50 (define-move-vop sap-move :move
53 ;;; Move untagged sap arguments/return-values.
54 (define-vop (move-sap-arg)
58 :load-if (not (sc-is y sap-reg))))
60 (:note "SAP argument move")
66 (if (= (tn-offset fp) esp-offset)
67 (storew x fp (tn-offset y)) ; c-call
68 (storew x fp (- (1+ (tn-offset y)))))))))
69 (define-move-vop move-sap-arg :move-arg
70 (descriptor-reg sap-reg) (sap-reg))
72 ;;; Use standard MOVE-ARG + coercion to move an untagged sap to a
73 ;;; descriptor passing location.
74 (define-move-vop move-arg :move-arg
75 (sap-reg) (descriptor-reg))
77 ;;;; SAP-INT and INT-SAP
79 ;;; The function SAP-INT is used to generate an integer corresponding
80 ;;; to the system area pointer, suitable for passing to the kernel
81 ;;; interfaces (which want all addresses specified as integers). The
82 ;;; function INT-SAP is used to do the opposite conversion. The
83 ;;; integer representation of a SAP is the byte offset of the SAP from
84 ;;; the start of the address space.
86 (:args (sap :scs (sap-reg) :target int))
87 (:arg-types system-area-pointer)
88 (:results (int :scs (unsigned-reg)))
89 (:result-types unsigned-num)
95 (:args (int :scs (unsigned-reg) :target sap))
96 (:arg-types unsigned-num)
97 (:results (sap :scs (sap-reg)))
98 (:result-types system-area-pointer)
104 ;;;; POINTER+ and POINTER-
106 (define-vop (pointer+)
108 (:args (ptr :scs (sap-reg) :target res
109 :load-if (not (location= ptr res)))
110 (offset :scs (signed-reg immediate)))
111 (:arg-types system-area-pointer signed-num)
112 (:results (res :scs (sap-reg) :from (:argument 0)
113 :load-if (not (location= ptr res))))
114 (:result-types system-area-pointer)
117 (cond ((and (sc-is ptr sap-reg) (sc-is res sap-reg)
118 (not (location= ptr res)))
121 (inst lea res (make-ea :dword :base ptr :index offset :scale 1)))
123 (inst lea res (make-ea :dword :base ptr
124 :disp (tn-value offset))))))
129 (inst add res offset))
131 (inst add res (tn-value offset))))))))
133 (define-vop (pointer-)
135 (:args (ptr1 :scs (sap-reg) :target res)
136 (ptr2 :scs (sap-reg)))
137 (:arg-types system-area-pointer system-area-pointer)
139 (:results (res :scs (signed-reg) :from (:argument 0)))
140 (:result-types signed-num)
143 (inst sub res ptr2)))
145 ;;;; mumble-SYSTEM-REF and mumble-SYSTEM-SET
147 (macrolet ((def-system-ref-and-set (ref-name
153 (let ((ref-name-c (symbolicate ref-name "-C"))
154 (set-name-c (symbolicate set-name "-C"))
155 (temp-sc (symbolicate size "-REG")))
157 (define-vop (,ref-name)
158 (:translate ,ref-name)
160 (:args (sap :scs (sap-reg))
161 (offset :scs (signed-reg immediate)))
162 (:arg-types system-area-pointer signed-num)
163 (:results (result :scs (,sc)))
164 (:result-types ,type)
166 ,(let ((mov-inst (cond
167 ((eq size :dword) 'mov)
172 (inst ,mov-inst result
173 (make-ea ,size :base sap
174 :disp (tn-value offset))))
175 (t (inst ,mov-inst result
176 (make-ea ,size :base sap
178 (define-vop (,set-name)
179 (:translate ,set-name)
181 (:args (sap :scs (sap-reg) :to (:eval 0))
182 (offset :scs (signed-reg immediate) :to (:eval 0))
184 :target ,(if (eq size :dword)
187 (:arg-types system-area-pointer signed-num ,type)
188 ,@(unless (eq size :dword)
189 `((:temporary (:sc ,temp-sc :offset eax-offset
190 :from (:argument 2) :to (:result 0)
193 (:results (result :scs (,sc)))
194 (:result-types ,type)
196 ,@(unless (eq size :dword)
197 `((move eax-tn value)))
198 (inst mov (sc-case offset
200 (make-ea ,size :base sap
201 :disp (tn-value offset)))
205 ,(if (eq size :dword) 'value 'temp))
207 ,(if (eq size :dword) 'value 'eax-tn))))))))
209 (def-system-ref-and-set sap-ref-8 %set-sap-ref-8
210 unsigned-reg positive-fixnum :byte nil)
211 (def-system-ref-and-set signed-sap-ref-8 %set-signed-sap-ref-8
212 signed-reg tagged-num :byte t)
213 (def-system-ref-and-set sap-ref-16 %set-sap-ref-16
214 unsigned-reg positive-fixnum :word nil)
215 (def-system-ref-and-set signed-sap-ref-16 %set-signed-sap-ref-16
216 signed-reg tagged-num :word t)
217 (def-system-ref-and-set sap-ref-32 %set-sap-ref-32
218 unsigned-reg unsigned-num :dword nil)
219 (def-system-ref-and-set signed-sap-ref-32 %set-signed-sap-ref-32
220 signed-reg signed-num :dword t)
221 (def-system-ref-and-set sap-ref-sap %set-sap-ref-sap
222 sap-reg system-area-pointer :dword))
226 (define-vop (sap-ref-double)
227 (:translate sap-ref-double)
229 (:args (sap :scs (sap-reg))
230 (offset :scs (signed-reg)))
231 (:arg-types system-area-pointer signed-num)
232 (:results (result :scs (double-reg)))
233 (:result-types double-float)
235 (with-empty-tn@fp-top(result)
236 (inst fldd (make-ea :dword :base sap :index offset)))))
238 (define-vop (sap-ref-double-c)
239 (:translate sap-ref-double)
241 (:args (sap :scs (sap-reg)))
242 (:arg-types system-area-pointer (:constant (signed-byte 32)))
244 (:results (result :scs (double-reg)))
245 (:result-types double-float)
247 (with-empty-tn@fp-top(result)
248 (inst fldd (make-ea :dword :base sap :disp offset)))))
250 (define-vop (%set-sap-ref-double)
251 (:translate %set-sap-ref-double)
253 (:args (sap :scs (sap-reg) :to (:eval 0))
254 (offset :scs (signed-reg) :to (:eval 0))
255 (value :scs (double-reg)))
256 (:arg-types system-area-pointer signed-num double-float)
257 (:results (result :scs (double-reg)))
258 (:result-types double-float)
260 (cond ((zerop (tn-offset value))
262 (inst fstd (make-ea :dword :base sap :index offset))
263 (unless (zerop (tn-offset result))
264 ;; Value is in ST0 but not result.
267 ;; Value is not in ST0.
269 (inst fstd (make-ea :dword :base sap :index offset))
270 (cond ((zerop (tn-offset result))
271 ;; The result is in ST0.
274 ;; Neither value or result are in ST0.
275 (unless (location= value result)
277 (inst fxch value)))))))
279 (define-vop (%set-sap-ref-double-c)
280 (:translate %set-sap-ref-double)
282 (:args (sap :scs (sap-reg) :to (:eval 0))
283 (value :scs (double-reg)))
284 (:arg-types system-area-pointer (:constant (signed-byte 32)) double-float)
286 (:results (result :scs (double-reg)))
287 (:result-types double-float)
289 (cond ((zerop (tn-offset value))
291 (inst fstd (make-ea :dword :base sap :disp offset))
292 (unless (zerop (tn-offset result))
293 ;; Value is in ST0 but not result.
296 ;; Value is not in ST0.
298 (inst fstd (make-ea :dword :base sap :disp offset))
299 (cond ((zerop (tn-offset result))
300 ;; The result is in ST0.
303 ;; Neither value or result are in ST0.
304 (unless (location= value result)
306 (inst fxch value)))))))
310 (define-vop (sap-ref-single)
311 (:translate sap-ref-single)
313 (:args (sap :scs (sap-reg))
314 (offset :scs (signed-reg)))
315 (:arg-types system-area-pointer signed-num)
316 (:results (result :scs (single-reg)))
317 (:result-types single-float)
319 (with-empty-tn@fp-top(result)
320 (inst fld (make-ea :dword :base sap :index offset)))))
322 (define-vop (sap-ref-single-c)
323 (:translate sap-ref-single)
325 (:args (sap :scs (sap-reg)))
326 (:arg-types system-area-pointer (:constant (signed-byte 32)))
328 (:results (result :scs (single-reg)))
329 (:result-types single-float)
331 (with-empty-tn@fp-top(result)
332 (inst fld (make-ea :dword :base sap :disp offset)))))
334 (define-vop (%set-sap-ref-single)
335 (:translate %set-sap-ref-single)
337 (:args (sap :scs (sap-reg) :to (:eval 0))
338 (offset :scs (signed-reg) :to (:eval 0))
339 (value :scs (single-reg)))
340 (:arg-types system-area-pointer signed-num single-float)
341 (:results (result :scs (single-reg)))
342 (:result-types single-float)
344 (cond ((zerop (tn-offset value))
346 (inst fst (make-ea :dword :base sap :index offset))
347 (unless (zerop (tn-offset result))
348 ;; Value is in ST0 but not result.
351 ;; Value is not in ST0.
353 (inst fst (make-ea :dword :base sap :index offset))
354 (cond ((zerop (tn-offset result))
355 ;; The result is in ST0.
358 ;; Neither value or result are in ST0
359 (unless (location= value result)
361 (inst fxch value)))))))
363 (define-vop (%set-sap-ref-single-c)
364 (:translate %set-sap-ref-single)
366 (:args (sap :scs (sap-reg) :to (:eval 0))
367 (value :scs (single-reg)))
368 (:arg-types system-area-pointer (:constant (signed-byte 32)) single-float)
370 (:results (result :scs (single-reg)))
371 (:result-types single-float)
373 (cond ((zerop (tn-offset value))
375 (inst fst (make-ea :dword :base sap :disp offset))
376 (unless (zerop (tn-offset result))
377 ;; Value is in ST0 but not result.
380 ;; Value is not in ST0.
382 (inst fst (make-ea :dword :base sap :disp offset))
383 (cond ((zerop (tn-offset result))
384 ;; The result is in ST0.
387 ;; Neither value or result are in ST0
388 (unless (location= value result)
390 (inst fxch value)))))))
394 (define-vop (sap-ref-long)
395 (:translate sap-ref-long)
397 (:args (sap :scs (sap-reg))
398 (offset :scs (signed-reg)))
399 (:arg-types system-area-pointer signed-num)
400 (:results (result :scs (#!+long-float long-reg #!-long-float double-reg)))
401 (:result-types #!+long-float long-float #!-long-float double-float)
403 (with-empty-tn@fp-top(result)
404 (inst fldl (make-ea :dword :base sap :index offset)))))
406 (define-vop (sap-ref-long-c)
407 (:translate sap-ref-long)
409 (:args (sap :scs (sap-reg)))
410 (:arg-types system-area-pointer (:constant (signed-byte 32)))
412 (:results (result :scs (#!+long-float long-reg #!-long-float double-reg)))
413 (:result-types #!+long-float long-float #!-long-float double-float)
415 (with-empty-tn@fp-top(result)
416 (inst fldl (make-ea :dword :base sap :disp offset)))))
419 (define-vop (%set-sap-ref-long)
420 (:translate %set-sap-ref-long)
422 (:args (sap :scs (sap-reg) :to (:eval 0))
423 (offset :scs (signed-reg) :to (:eval 0))
424 (value :scs (long-reg)))
425 (:arg-types system-area-pointer signed-num long-float)
426 (:results (result :scs (long-reg)))
427 (:result-types long-float)
429 (cond ((zerop (tn-offset value))
431 (store-long-float (make-ea :dword :base sap :index offset))
432 (unless (zerop (tn-offset result))
433 ;; Value is in ST0 but not result.
436 ;; Value is not in ST0.
438 (store-long-float (make-ea :dword :base sap :index offset))
439 (cond ((zerop (tn-offset result))
440 ;; The result is in ST0.
443 ;; Neither value or result are in ST0
444 (unless (location= value result)
446 (inst fxch value)))))))
448 ;;; noise to convert normal lisp data objects into SAPs
450 (define-vop (vector-sap)
451 (:translate vector-sap)
453 (:args (vector :scs (descriptor-reg) :target sap))
454 (:results (sap :scs (sap-reg)))
455 (:result-types system-area-pointer)
460 (- (* vector-data-offset n-word-bytes) other-pointer-lowtag))))
462 ;;; Transforms for 64-bit SAP accessors.
464 (deftransform sap-ref-64 ((sap offset) (* *))
465 '(logior (sap-ref-32 sap offset)
466 (ash (sap-ref-32 sap (+ offset 4)) 32)))
468 (deftransform signed-sap-ref-64 ((sap offset) (* *))
469 '(logior (sap-ref-32 sap offset)
470 (ash (signed-sap-ref-32 sap (+ offset 4)) 32)))
472 (deftransform %set-sap-ref-64 ((sap offset value) (* * *))
474 (%set-sap-ref-32 sap offset (logand value #xffffffff))
475 (%set-sap-ref-32 sap (+ offset 4) (ash value -32))))
477 (deftransform %set-signed-sap-ref-64 ((sap offset value) (* * *))
479 (%set-sap-ref-32 sap offset (logand value #xffffffff))
480 (%set-signed-sap-ref-32 sap (+ offset 4) (ash value -32))))