1 ;;;; Alpha VM definitions of various system hacking 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 ;;;; type frobbing VOPs
16 (define-vop (lowtag-of)
17 (:translate lowtag-of)
19 (:args (object :scs (any-reg descriptor-reg)))
20 (:results (result :scs (unsigned-reg)))
21 (:result-types positive-fixnum)
23 (inst and object lowtag-mask result)))
25 (define-vop (widetag-of)
26 (:translate widetag-of)
28 (:args (object :scs (descriptor-reg)))
29 (:temporary (:scs (non-descriptor-reg)) ndescr)
30 (:results (result :scs (unsigned-reg)))
31 (:result-types positive-fixnum)
33 ;; Pick off objects with headers.
34 (inst and object lowtag-mask result)
35 (inst cmpeq result other-pointer-lowtag ndescr)
36 (inst bne ndescr other-ptr)
37 (inst cmpeq result fun-pointer-lowtag ndescr)
38 (inst bne ndescr function-ptr)
40 ;; Pick off structure and list pointers.
41 (inst blbs object done)
44 (inst and object fixnum-tag-mask result)
45 (inst beq result done)
47 ;; Must be an other immediate.
48 (inst and object widetag-mask result)
49 (inst br zero-tn done)
52 (load-type result object (- fun-pointer-lowtag))
53 (inst br zero-tn done)
56 (load-type result object (- other-pointer-lowtag))
60 (define-vop (fun-subtype)
61 (:translate fun-subtype)
63 (:args (function :scs (descriptor-reg)))
64 (:results (result :scs (unsigned-reg)))
65 (:result-types positive-fixnum)
67 (load-type result function (- fun-pointer-lowtag))))
69 (define-vop (set-fun-subtype)
70 (:translate (setf fun-subtype))
72 (:args (type :scs (unsigned-reg) :target result)
73 (function :scs (descriptor-reg)))
74 (:arg-types positive-fixnum *)
75 (:temporary (:scs (non-descriptor-reg)) temp)
76 (:results (result :scs (unsigned-reg)))
77 (:result-types positive-fixnum)
79 (inst ldl temp (- fun-pointer-lowtag) function)
80 (inst and temp #xff temp)
81 (inst bis type temp temp)
82 (inst stl temp (- fun-pointer-lowtag) function)
86 (define-vop (get-header-data)
87 (:translate get-header-data)
89 (:args (x :scs (descriptor-reg)))
90 (:results (res :scs (unsigned-reg)))
91 (:result-types positive-fixnum)
93 (loadw res x 0 other-pointer-lowtag)
94 (inst srl res n-widetag-bits res)))
96 (define-vop (get-closure-length)
97 (:translate get-closure-length)
99 (:args (x :scs (descriptor-reg)))
100 (:results (res :scs (unsigned-reg)))
101 (:result-types positive-fixnum)
103 (loadw res x 0 fun-pointer-lowtag)
104 (inst srl res n-widetag-bits res)))
106 (define-vop (set-header-data)
107 (:translate set-header-data)
109 (:args (x :scs (descriptor-reg) :target res)
110 (data :scs (any-reg immediate zero)))
111 (:arg-types * positive-fixnum)
112 (:results (res :scs (descriptor-reg)))
113 (:temporary (:scs (non-descriptor-reg)) t1 t2)
115 (loadw t1 x 0 other-pointer-lowtag)
116 (inst and t1 widetag-mask t1)
119 (inst sll data (- n-widetag-bits 2) t2)
122 (let ((c (ash (tn-value data) n-widetag-bits)))
123 (cond ((<= 0 c (1- (ash 1 8)))
127 (inst bis t1 t2 t1)))))
129 (storew t1 x 0 other-pointer-lowtag)
132 (define-vop (make-fixnum)
133 (:args (ptr :scs (any-reg descriptor-reg)))
134 (:results (res :scs (any-reg descriptor-reg)))
137 ;; Some code (the hash table code) depends on this returning a
138 ;; positive number so make sure it does.
139 (inst sll ptr 35 res)
140 (inst srl res 33 res)))
142 (define-vop (make-other-immediate-type)
143 (:args (val :scs (any-reg descriptor-reg))
144 (type :scs (any-reg descriptor-reg immediate)
146 (:results (res :scs (any-reg descriptor-reg)))
147 (:temporary (:scs (non-descriptor-reg)) temp)
151 (inst sll val n-widetag-bits temp)
152 (inst bis temp (tn-value type) res))
154 (inst sra type n-fixnum-tag-bits temp)
155 (inst sll val (- n-widetag-bits n-fixnum-tag-bits) res)
156 (inst bis res temp res)))))
161 (define-vop (dynamic-space-free-pointer)
162 (:results (int :scs (sap-reg)))
163 (:result-types system-area-pointer)
164 (:translate dynamic-space-free-pointer)
167 (move alloc-tn int)))
169 (define-vop (binding-stack-pointer-sap)
170 (:results (int :scs (sap-reg)))
171 (:result-types system-area-pointer)
172 (:translate binding-stack-pointer-sap)
177 (define-vop (control-stack-pointer-sap)
178 (:results (int :scs (sap-reg)))
179 (:result-types system-area-pointer)
180 (:translate control-stack-pointer-sap)
186 ;;;; code object frobbing
188 (define-vop (code-instructions)
189 (:translate code-instructions)
191 (:args (code :scs (descriptor-reg)))
192 (:temporary (:scs (non-descriptor-reg)) ndescr)
193 (:results (sap :scs (sap-reg)))
194 (:result-types system-area-pointer)
196 (loadw ndescr code 0 other-pointer-lowtag)
197 (inst srl ndescr n-widetag-bits ndescr)
198 (inst sll ndescr word-shift ndescr)
199 (inst subq ndescr other-pointer-lowtag ndescr)
200 (inst addq code ndescr sap)))
202 (define-vop (compute-fun)
203 (:args (code :scs (descriptor-reg))
204 (offset :scs (signed-reg unsigned-reg)))
205 (:arg-types * positive-fixnum)
206 (:results (func :scs (descriptor-reg)))
207 (:temporary (:scs (non-descriptor-reg)) ndescr)
209 (loadw ndescr code 0 other-pointer-lowtag)
210 (inst srl ndescr n-widetag-bits ndescr)
211 (inst sll ndescr word-shift ndescr)
212 (inst addq ndescr offset ndescr)
213 (inst subq ndescr (- other-pointer-lowtag fun-pointer-lowtag) ndescr)
214 (inst addq code ndescr func)))
216 ;;;; other random VOPs.
218 (defknown sb!unix::receive-pending-interrupt () (values))
219 (define-vop (sb!unix::receive-pending-interrupt)
221 (:translate sb!unix::receive-pending-interrupt)
223 (inst gentrap pending-interrupt-trap)))
228 (inst gentrap halt-trap)))
230 (define-vop (istream-memory-barrier)
234 ;;;; dynamic vop count collection support
236 (define-vop (count-me)
237 (:args (count-vector :scs (descriptor-reg)))
239 (:temporary (:scs (non-descriptor-reg)) count)
242 (- (* (+ index vector-data-offset) n-word-bytes)
243 other-pointer-lowtag)))
244 (inst ldl count offset count-vector)
245 (inst addq count 1 count)
246 (inst stl count offset count-vector))))