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.
17 ;;;; moves and coercions
19 ;;; Move a tagged SAP to an untagged representation.
20 (define-vop (move-to-sap)
21 (:args (x :scs (descriptor-reg)))
22 (:results (y :scs (sap-reg)))
23 (:note "pointer to SAP coercion")
25 (loadw y x sap-pointer-slot other-pointer-type)))
26 (define-move-vop move-to-sap :move
27 (descriptor-reg) (sap-reg))
29 ;;; Move an untagged SAP to a tagged representation.
30 (define-vop (move-from-sap)
31 (:args (sap :scs (sap-reg) :to :result))
32 (:results (res :scs (descriptor-reg) :from :argument))
33 (:note "SAP to pointer coercion")
36 (with-fixed-allocation (res sap-type sap-size node)
37 (storew sap res sap-pointer-slot other-pointer-type))))
38 (define-move-vop move-from-sap :move
39 (sap-reg) (descriptor-reg))
41 ;;; Move untagged sap values.
42 (define-vop (sap-move)
45 :load-if (not (location= x y))))
46 (:results (y :scs (sap-reg)
47 :load-if (not (location= x y))))
53 (define-move-vop sap-move :move
56 ;;; Move untagged sap arguments/return-values.
57 (define-vop (move-sap-argument)
61 :load-if (not (sc-is y sap-reg))))
63 (:note "SAP argument move")
69 (if (= (tn-offset fp) esp-offset)
70 (storew x fp (tn-offset y)) ; c-call
71 (storew x fp (- (1+ (tn-offset y)))))))))
72 (define-move-vop move-sap-argument :move-argument
73 (descriptor-reg sap-reg) (sap-reg))
75 ;;; Use standard MOVE-ARGUMENT + coercion to move an untagged sap to a
76 ;;; descriptor passing location.
77 (define-move-vop move-argument :move-argument
78 (sap-reg) (descriptor-reg))
80 ;;;; SAP-INT and INT-SAP
83 (:args (sap :scs (sap-reg) :target int))
84 (:arg-types system-area-pointer)
85 (:results (int :scs (unsigned-reg)))
86 (:result-types unsigned-num)
93 (:args (int :scs (unsigned-reg) :target sap))
94 (:arg-types unsigned-num)
95 (:results (sap :scs (sap-reg)))
96 (:result-types system-area-pointer)
102 ;;;; POINTER+ and POINTER-
104 (define-vop (pointer+)
106 (:args (ptr :scs (sap-reg) :target res
107 :load-if (not (location= ptr res)))
108 (offset :scs (signed-reg immediate)))
109 (:arg-types system-area-pointer signed-num)
110 (:results (res :scs (sap-reg) :from (:argument 0)
111 :load-if (not (location= ptr res))))
112 (:result-types system-area-pointer)
115 (cond ((and (sc-is ptr sap-reg) (sc-is res sap-reg)
116 (not (location= ptr res)))
119 (inst lea res (make-ea :dword :base ptr :index offset :scale 1)))
121 (inst lea res (make-ea :dword :base ptr
122 :disp (tn-value offset))))))
127 (inst add res offset))
129 (inst add res (tn-value offset))))))))
131 (define-vop (pointer-)
133 (:args (ptr1 :scs (sap-reg) :target res)
134 (ptr2 :scs (sap-reg)))
135 (:arg-types system-area-pointer system-area-pointer)
137 (:results (res :scs (signed-reg) :from (:argument 0)))
138 (:result-types signed-num)
141 (inst sub res ptr2)))
143 ;;;; mumble-SYSTEM-REF and mumble-SYSTEM-SET
145 (macrolet ((def-system-ref-and-set (ref-name
151 (let ((ref-name-c (symbolicate ref-name "-C"))
152 (set-name-c (symbolicate set-name "-C"))
153 (temp-sc (symbolicate size "-REG")))
155 (define-vop (,ref-name)
156 (:translate ,ref-name)
158 (:args (sap :scs (sap-reg))
159 (offset :scs (signed-reg)))
160 (:arg-types system-area-pointer signed-num)
161 ,@(unless (eq size :dword)
162 `((:temporary (:sc ,temp-sc
166 (:results (result :scs (,sc)))
167 (:result-types ,type)
169 (inst mov ,(if (eq size :dword) 'result 'temp)
170 (make-ea ,size :base sap :index offset))
171 ,@(unless (eq size :dword)
172 `((inst ,(if signed 'movsx 'movzx)
174 (define-vop (,ref-name-c)
175 (:translate ,ref-name)
177 (:args (sap :scs (sap-reg)))
178 (:arg-types system-area-pointer
179 (:constant (signed-byte 32)))
181 ,@(unless (eq size :dword)
182 `((:temporary (:sc ,temp-sc
186 (:results (result :scs (,sc)))
187 (:result-types ,type)
189 (inst mov ,(if (eq size :dword) 'result 'temp)
190 (make-ea ,size :base sap :disp offset))
191 ,@(unless (eq size :dword)
192 `((inst ,(if signed 'movsx 'movzx)
194 (define-vop (,set-name)
195 (:translate ,set-name)
197 (:args (sap :scs (sap-reg) :to (:eval 0))
198 (offset :scs (signed-reg) :to (:eval 0))
200 :target ,(if (eq size :dword)
203 (:arg-types system-area-pointer signed-num ,type)
204 ,@(unless (eq size :dword)
205 `((:temporary (:sc ,temp-sc :offset eax-offset
206 :from (:argument 2) :to (:result 0)
209 (:results (result :scs (,sc)))
210 (:result-types ,type)
212 ,@(unless (eq size :dword)
213 `((move eax-tn value)))
214 (inst mov (make-ea ,size
217 ,(if (eq size :dword) 'value 'temp))
219 ,(if (eq size :dword) 'value 'eax-tn))))
220 (define-vop (,set-name-c)
221 (:translate ,set-name)
223 (:args (sap :scs (sap-reg) :to (:eval 0))
225 :target ,(if (eq size :dword)
228 (:arg-types system-area-pointer
229 (:constant (signed-byte 32)) ,type)
231 ,@(unless (eq size :dword)
232 `((:temporary (:sc ,temp-sc :offset eax-offset
233 :from (:argument 2) :to (:result 0)
236 (:results (result :scs (,sc)))
237 (:result-types ,type)
239 ,@(unless (eq size :dword)
240 `((move eax-tn value)))
242 (make-ea ,size :base sap :disp offset)
243 ,(if (eq size :dword) 'value 'temp))
244 (move result ,(if (eq size :dword)
248 (def-system-ref-and-set sap-ref-8 %set-sap-ref-8
249 unsigned-reg positive-fixnum :byte nil)
250 (def-system-ref-and-set signed-sap-ref-8 %set-signed-sap-ref-8
251 signed-reg tagged-num :byte t)
252 (def-system-ref-and-set sap-ref-16 %set-sap-ref-16
253 unsigned-reg positive-fixnum :word nil)
254 (def-system-ref-and-set signed-sap-ref-16 %set-signed-sap-ref-16
255 signed-reg tagged-num :word t)
256 (def-system-ref-and-set sap-ref-32 %set-sap-ref-32
257 unsigned-reg unsigned-num :dword nil)
258 (def-system-ref-and-set signed-sap-ref-32 %set-signed-sap-ref-32
259 signed-reg signed-num :dword t)
260 (def-system-ref-and-set sap-ref-sap %set-sap-ref-sap
261 sap-reg system-area-pointer :dword))
265 (define-vop (sap-ref-double)
266 (:translate sap-ref-double)
268 (:args (sap :scs (sap-reg))
269 (offset :scs (signed-reg)))
270 (:arg-types system-area-pointer signed-num)
271 (:results (result :scs (double-reg)))
272 (:result-types double-float)
274 (with-empty-tn@fp-top(result)
275 (inst fldd (make-ea :dword :base sap :index offset)))))
277 (define-vop (sap-ref-double-c)
278 (:translate sap-ref-double)
280 (:args (sap :scs (sap-reg)))
281 (:arg-types system-area-pointer (:constant (signed-byte 32)))
283 (:results (result :scs (double-reg)))
284 (:result-types double-float)
286 (with-empty-tn@fp-top(result)
287 (inst fldd (make-ea :dword :base sap :disp offset)))))
289 (define-vop (%set-sap-ref-double)
290 (:translate %set-sap-ref-double)
292 (:args (sap :scs (sap-reg) :to (:eval 0))
293 (offset :scs (signed-reg) :to (:eval 0))
294 (value :scs (double-reg)))
295 (:arg-types system-area-pointer signed-num double-float)
296 (:results (result :scs (double-reg)))
297 (:result-types double-float)
299 (cond ((zerop (tn-offset value))
301 (inst fstd (make-ea :dword :base sap :index offset))
302 (unless (zerop (tn-offset result))
303 ;; Value is in ST0 but not result.
306 ;; Value is not in ST0.
308 (inst fstd (make-ea :dword :base sap :index offset))
309 (cond ((zerop (tn-offset result))
310 ;; The result is in ST0.
313 ;; Neither value or result are in ST0.
314 (unless (location= value result)
316 (inst fxch value)))))))
318 (define-vop (%set-sap-ref-double-c)
319 (:translate %set-sap-ref-double)
321 (:args (sap :scs (sap-reg) :to (:eval 0))
322 (value :scs (double-reg)))
323 (:arg-types system-area-pointer (:constant (signed-byte 32)) double-float)
325 (:results (result :scs (double-reg)))
326 (:result-types double-float)
328 (cond ((zerop (tn-offset value))
330 (inst fstd (make-ea :dword :base sap :disp offset))
331 (unless (zerop (tn-offset result))
332 ;; Value is in ST0 but not result.
335 ;; Value is not in ST0.
337 (inst fstd (make-ea :dword :base sap :disp offset))
338 (cond ((zerop (tn-offset result))
339 ;; The result is in ST0.
342 ;; Neither value or result are in ST0.
343 (unless (location= value result)
345 (inst fxch value)))))))
349 (define-vop (sap-ref-single)
350 (:translate sap-ref-single)
352 (:args (sap :scs (sap-reg))
353 (offset :scs (signed-reg)))
354 (:arg-types system-area-pointer signed-num)
355 (:results (result :scs (single-reg)))
356 (:result-types single-float)
358 (with-empty-tn@fp-top(result)
359 (inst fld (make-ea :dword :base sap :index offset)))))
361 (define-vop (sap-ref-single-c)
362 (:translate sap-ref-single)
364 (:args (sap :scs (sap-reg)))
365 (:arg-types system-area-pointer (:constant (signed-byte 32)))
367 (:results (result :scs (single-reg)))
368 (:result-types single-float)
370 (with-empty-tn@fp-top(result)
371 (inst fld (make-ea :dword :base sap :disp offset)))))
373 (define-vop (%set-sap-ref-single)
374 (:translate %set-sap-ref-single)
376 (:args (sap :scs (sap-reg) :to (:eval 0))
377 (offset :scs (signed-reg) :to (:eval 0))
378 (value :scs (single-reg)))
379 (:arg-types system-area-pointer signed-num single-float)
380 (:results (result :scs (single-reg)))
381 (:result-types single-float)
383 (cond ((zerop (tn-offset value))
385 (inst fst (make-ea :dword :base sap :index offset))
386 (unless (zerop (tn-offset result))
387 ;; Value is in ST0 but not result.
390 ;; Value is not in ST0.
392 (inst fst (make-ea :dword :base sap :index offset))
393 (cond ((zerop (tn-offset result))
394 ;; The result is in ST0.
397 ;; Neither value or result are in ST0
398 (unless (location= value result)
400 (inst fxch value)))))))
402 (define-vop (%set-sap-ref-single-c)
403 (:translate %set-sap-ref-single)
405 (:args (sap :scs (sap-reg) :to (:eval 0))
406 (value :scs (single-reg)))
407 (:arg-types system-area-pointer (:constant (signed-byte 32)) single-float)
409 (:results (result :scs (single-reg)))
410 (:result-types single-float)
412 (cond ((zerop (tn-offset value))
414 (inst fst (make-ea :dword :base sap :disp offset))
415 (unless (zerop (tn-offset result))
416 ;; Value is in ST0 but not result.
419 ;; Value is not in ST0.
421 (inst fst (make-ea :dword :base sap :disp offset))
422 (cond ((zerop (tn-offset result))
423 ;; The result is in ST0.
426 ;; Neither value or result are in ST0
427 (unless (location= value result)
429 (inst fxch value)))))))
433 (define-vop (sap-ref-long)
434 (:translate sap-ref-long)
436 (:args (sap :scs (sap-reg))
437 (offset :scs (signed-reg)))
438 (:arg-types system-area-pointer signed-num)
439 (:results (result :scs (#!+long-float long-reg #!-long-float double-reg)))
440 (:result-types #!+long-float long-float #!-long-float double-float)
442 (with-empty-tn@fp-top(result)
443 (inst fldl (make-ea :dword :base sap :index offset)))))
445 (define-vop (sap-ref-long-c)
446 (:translate sap-ref-long)
448 (:args (sap :scs (sap-reg)))
449 (:arg-types system-area-pointer (:constant (signed-byte 32)))
451 (:results (result :scs (#!+long-float long-reg #!-long-float double-reg)))
452 (:result-types #!+long-float long-float #!-long-float double-float)
454 (with-empty-tn@fp-top(result)
455 (inst fldl (make-ea :dword :base sap :disp offset)))))
458 (define-vop (%set-sap-ref-long)
459 (:translate %set-sap-ref-long)
461 (:args (sap :scs (sap-reg) :to (:eval 0))
462 (offset :scs (signed-reg) :to (:eval 0))
463 (value :scs (long-reg)))
464 (:arg-types system-area-pointer signed-num long-float)
465 (:results (result :scs (long-reg)))
466 (:result-types long-float)
468 (cond ((zerop (tn-offset value))
470 (store-long-float (make-ea :dword :base sap :index offset))
471 (unless (zerop (tn-offset result))
472 ;; Value is in ST0 but not result.
475 ;; Value is not in ST0.
477 (store-long-float (make-ea :dword :base sap :index offset))
478 (cond ((zerop (tn-offset result))
479 ;; The result is in ST0.
482 ;; Neither value or result are in ST0
483 (unless (location= value result)
485 (inst fxch value)))))))
487 ;;; noise to convert normal lisp data objects into SAPs
489 (define-vop (vector-sap)
490 (:translate vector-sap)
492 (:args (vector :scs (descriptor-reg) :target sap))
493 (:results (sap :scs (sap-reg)))
494 (:result-types system-area-pointer)
497 (inst add sap (- (* vector-data-offset word-bytes) other-pointer-type))))