1 ;;;; the MIPS VM definition of SAP operations
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 "system area pointer indirection")
22 (loadw y x sap-pointer-slot other-pointer-lowtag)))
24 (define-move-vop move-to-sap :move
25 (descriptor-reg) (sap-reg))
28 ;;; Move an untagged SAP to a tagged representation.
29 (define-vop (move-from-sap)
30 (:args (x :scs (sap-reg) :to (:eval 1)))
31 (:temporary (:scs (non-descriptor-reg)) ndescr)
32 (:results (y :scs (descriptor-reg) :from (:eval 0)))
33 (:note "system area pointer allocation")
35 (with-fixed-allocation (y ndescr sap-widetag sap-size)
36 (storew x y sap-pointer-slot other-pointer-lowtag))))
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))))
68 (storew x fp (tn-offset y))))))
70 (define-move-vop move-sap-argument :move-arg
71 (descriptor-reg sap-reg) (sap-reg))
73 ;;; Use standard MOVE-ARG + coercion to move an untagged sap to a
74 ;;; descriptor passing location.
75 (define-move-vop move-argument :move-arg
76 (sap-reg) (descriptor-reg))
78 ;;;; SAP-INT and INT-SAP
80 (:args (sap :scs (sap-reg) :target int))
81 (:arg-types system-area-pointer)
82 (:results (int :scs (unsigned-reg)))
83 (:result-types unsigned-num)
90 (:args (int :scs (unsigned-reg) :target sap))
91 (:arg-types unsigned-num)
92 (:results (sap :scs (sap-reg)))
93 (:result-types system-area-pointer)
99 ;;;; POINTER+ and POINTER-
100 (define-vop (pointer+)
102 (:args (ptr :scs (sap-reg) :target res)
103 (offset :scs (signed-reg)))
104 (:arg-types system-area-pointer signed-num)
105 (:results (res :scs (sap-reg)))
106 (:result-types system-area-pointer)
109 (inst add ptr offset res)))
111 (define-vop (pointer+-c)
113 (:args (ptr :scs (sap-reg)))
115 (:arg-types system-area-pointer (:constant (signed-byte 11)))
116 (:results (res :scs (sap-reg)))
117 (:result-types system-area-pointer)
120 (inst addi offset ptr res)))
122 (define-vop (pointer-)
124 (:args (ptr1 :scs (sap-reg))
125 (ptr2 :scs (sap-reg)))
126 (:arg-types system-area-pointer system-area-pointer)
128 (:results (res :scs (signed-reg)))
129 (:result-types signed-num)
131 (inst sub ptr1 ptr2 res)))
133 ;;;; mumble-SYSTEM-REF and mumble-SYSTEM-SET
134 (macrolet ((def-system-ref-and-set
135 (ref-name set-name sc type size &optional signed)
136 (let ((ref-name-c (symbolicate ref-name "-C"))
137 (set-name-c (symbolicate set-name "-C")))
139 (define-vop (,ref-name)
140 (:translate ,ref-name)
142 (:args (object :scs (sap-reg))
143 (offset :scs (signed-reg)))
144 (:arg-types system-area-pointer signed-num)
145 (:results (result :scs (,sc)))
146 (:result-types ,type)
153 offset object result)
154 ,@(when (and signed (not (eq size :long)))
155 `((inst extrs result 31 ,(ecase size
159 (define-vop (,ref-name-c)
160 (:translate ,ref-name)
162 (:args (object :scs (sap-reg)))
163 (:arg-types system-area-pointer
164 (:constant ,(if (eq size :float)
168 (:results (result :scs (,sc)))
169 (:result-types ,type)
176 offset object result)
177 ,@(when (and signed (not (eq size :long)))
178 `((inst extrs result 31 ,(ecase size
182 (define-vop (,set-name)
183 (:translate ,set-name)
185 (:args (object :scs (sap-reg)
186 ,@(unless (eq size :float) '(:target sap)))
187 (offset :scs (signed-reg))
188 (value :scs (,sc) :target result))
189 (:arg-types system-area-pointer signed-num ,type)
190 (:results (result :scs (,sc)))
191 (:result-types ,type)
192 ,@(unless (eq size :float)
193 '((:temporary (:scs (sap-reg) :from (:argument 0)) sap)))
195 ,@(if (eq size :float)
196 `((inst fstx value offset object)
197 (unless (location= value result)
198 (inst funop :copy value result)))
199 `((inst add object offset sap)
200 (inst ,(ecase size (:byte 'stb) (:short 'sth) (:long 'stw))
202 (move value result)))))
203 (define-vop (,set-name-c)
204 (:translate ,set-name)
206 (:args (object :scs (sap-reg))
207 (value :scs (,sc) :target result))
208 (:arg-types system-area-pointer
209 (:constant ,(if (eq size :float)
214 (:results (result :scs (,sc)))
215 (:result-types ,type)
217 ,@(if (eq size :float)
218 `((inst fsts value offset object)
219 (unless (location= value result)
220 (inst funop :copy value result)))
221 `((inst ,(ecase size (:byte 'stb) (:short 'sth) (:long 'stw))
223 (move value result)))))))))
224 (def-system-ref-and-set sap-ref-8 %set-sap-ref-8
225 unsigned-reg positive-fixnum :byte nil)
226 (def-system-ref-and-set signed-sap-ref-8 %set-signed-sap-ref-8
227 signed-reg tagged-num :byte t)
228 (def-system-ref-and-set sap-ref-16 %set-sap-ref-16
229 unsigned-reg positive-fixnum :short nil)
230 (def-system-ref-and-set signed-sap-ref-16 %set-signed-sap-ref-16
231 signed-reg tagged-num :short t)
232 (def-system-ref-and-set sap-ref-32 %set-sap-ref-32
233 unsigned-reg unsigned-num :long nil)
234 (def-system-ref-and-set signed-sap-ref-32 %set-signed-sap-ref-32
235 signed-reg signed-num :long t)
236 (def-system-ref-and-set sap-ref-sap %set-sap-ref-sap
237 sap-reg system-area-pointer :long)
238 (def-system-ref-and-set sap-ref-single %set-sap-ref-single
239 single-reg single-float :float)
240 (def-system-ref-and-set sap-ref-double %set-sap-ref-double
241 double-reg double-float :float))
243 ;;; Noise to convert normal lisp data objects into SAPs.
244 (define-vop (vector-sap)
245 (:translate vector-sap)
247 (:args (vector :scs (descriptor-reg)))
248 (:results (sap :scs (sap-reg)))
249 (:result-types system-area-pointer)
252 (- (* vector-data-offset n-word-bytes) other-pointer-lowtag)
256 ;;; Transforms for 64-bit SAP accessors.
258 (deftransform sap-ref-64 ((sap offset) (* *))
259 '(logior (ash (sap-ref-32 sap offset) 32)
260 (sap-ref-32 sap (+ offset 4))))
262 (deftransform signed-sap-ref-64 ((sap offset) (* *))
263 '(logior (ash (signed-sap-ref-32 sap offset) 32)
264 (sap-ref-32 sap (+ 4 offset))))
266 (deftransform %set-sap-ref-64 ((sap offset value) (* * *))
268 (%set-sap-ref-32 sap offset (ash value -32))
269 (%set-sap-ref-32 sap (+ offset 4) (logand value #xffffffff))))
271 (deftransform %set-signed-sap-ref-64 ((sap offset value) (* * *))
273 (%set-signed-sap-ref-32 sap offset (ash value -32))
274 (%set-sap-ref-32 sap (+ 4 offset) (logand value #xffffffff))))