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 n-fixnum-tag-bits) 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 (pointer-hash)
133 (:translate pointer-hash)
134 (:args (ptr :scs (any-reg descriptor-reg)))
135 (:results (res :scs (any-reg descriptor-reg)))
138 ;; FIXME: It would be better if this would mask the lowtag,
139 ;; and shift the result into a positive fixnum like on x86.
140 (inst sll ptr 35 res)
141 (inst srl res 33 res)))
146 (define-vop (dynamic-space-free-pointer)
147 (:results (int :scs (sap-reg)))
148 (:result-types system-area-pointer)
149 (:translate dynamic-space-free-pointer)
152 (move alloc-tn int)))
154 (define-vop (binding-stack-pointer-sap)
155 (:results (int :scs (sap-reg)))
156 (:result-types system-area-pointer)
157 (:translate binding-stack-pointer-sap)
162 (define-vop (control-stack-pointer-sap)
163 (:results (int :scs (sap-reg)))
164 (:result-types system-area-pointer)
165 (:translate control-stack-pointer-sap)
171 ;;;; code object frobbing
173 (define-vop (code-instructions)
174 (:translate code-instructions)
176 (:args (code :scs (descriptor-reg)))
177 (:temporary (:scs (non-descriptor-reg)) ndescr)
178 (:results (sap :scs (sap-reg)))
179 (:result-types system-area-pointer)
181 (loadw ndescr code 0 other-pointer-lowtag)
182 (inst srl ndescr n-widetag-bits ndescr)
183 (inst sll ndescr word-shift ndescr)
184 (inst subq ndescr other-pointer-lowtag ndescr)
185 (inst addq code ndescr sap)))
187 (define-vop (compute-fun)
188 (:args (code :scs (descriptor-reg))
189 (offset :scs (signed-reg unsigned-reg)))
190 (:arg-types * positive-fixnum)
191 (:results (func :scs (descriptor-reg)))
192 (:temporary (:scs (non-descriptor-reg)) ndescr)
194 (loadw ndescr code 0 other-pointer-lowtag)
195 (inst srl ndescr n-widetag-bits ndescr)
196 (inst sll ndescr word-shift ndescr)
197 (inst addq ndescr offset ndescr)
198 (inst subq ndescr (- other-pointer-lowtag fun-pointer-lowtag) ndescr)
199 (inst addq code ndescr func)))
201 ;;;; other random VOPs.
203 (defknown sb!unix::receive-pending-interrupt () (values))
204 (define-vop (sb!unix::receive-pending-interrupt)
206 (:translate sb!unix::receive-pending-interrupt)
208 (inst gentrap pending-interrupt-trap)))
213 (inst gentrap halt-trap)))
215 (define-vop (istream-memory-barrier)
219 ;;;; dynamic vop count collection support
221 (define-vop (count-me)
222 (:args (count-vector :scs (descriptor-reg)))
224 (:temporary (:scs (non-descriptor-reg)) count)
227 (- (* (+ index vector-data-offset) n-word-bytes)
228 other-pointer-lowtag)))
229 (inst ldl count offset count-vector)
230 (inst addq count 1 count)
231 (inst stl count offset count-vector))))
233 ;;;; Dummy definition for a spin-loop hint VOP
234 (define-vop (spin-loop-hint)
235 (:translate spin-loop-hint)