1 ;;;; x86 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 control-stack)
21 (:results (result :scs (unsigned-reg)))
22 (:result-types positive-fixnum)
25 (inst and result lowtag-mask)))
27 (define-vop (widetag-of)
28 (:translate widetag-of)
30 (:args (object :scs (descriptor-reg)))
31 (:temporary (:sc unsigned-reg :offset eax-offset :to (:result 0)) eax)
32 (:results (result :scs (unsigned-reg)))
33 (:result-types positive-fixnum)
36 (inst and al-tn lowtag-mask)
37 (inst cmp al-tn other-pointer-lowtag)
38 (inst jmp :e other-ptr)
39 (inst cmp al-tn fun-pointer-lowtag)
40 (inst jmp :e function-ptr)
42 ;; Pick off structures and list pointers.
50 ;; must be an other immediate
55 (load-type al-tn object (- fun-pointer-lowtag))
59 (load-type al-tn object (- other-pointer-lowtag))
62 (inst movzx result al-tn)))
64 (define-vop (fun-subtype)
65 (:translate fun-subtype)
67 (:args (function :scs (descriptor-reg)))
68 (:temporary (:sc byte-reg :from (:eval 0) :to (:eval 1)) temp)
69 (:results (result :scs (unsigned-reg)))
70 (:result-types positive-fixnum)
72 (load-type temp function (- fun-pointer-lowtag))
73 (inst movzx result temp)))
75 (define-vop (set-fun-subtype)
76 (:translate (setf fun-subtype))
78 (:args (type :scs (unsigned-reg) :target eax)
79 (function :scs (descriptor-reg)))
80 (:arg-types positive-fixnum *)
81 (:temporary (:sc unsigned-reg :offset eax-offset :from (:argument 0)
82 :to (:result 0) :target result)
84 (:results (result :scs (unsigned-reg)))
85 (:result-types positive-fixnum)
88 (storeb al-tn function 0 fun-pointer-lowtag)
91 (define-vop (get-header-data)
92 (:translate get-header-data)
94 (:args (x :scs (descriptor-reg)))
95 (:results (res :scs (unsigned-reg)))
96 (:result-types positive-fixnum)
98 (loadw res x 0 other-pointer-lowtag)
99 (inst shr res n-widetag-bits)))
101 (define-vop (get-closure-length)
102 (:translate get-closure-length)
104 (:args (x :scs (descriptor-reg)))
105 (:results (res :scs (unsigned-reg)))
106 (:result-types positive-fixnum)
108 (loadw res x 0 fun-pointer-lowtag)
109 (inst shr res n-widetag-bits)))
111 (define-vop (set-header-data)
112 (:translate set-header-data)
114 (:args (x :scs (descriptor-reg) :target res :to (:result 0))
115 (data :scs (any-reg) :target eax))
116 (:arg-types * positive-fixnum)
117 (:results (res :scs (descriptor-reg)))
118 (:temporary (:sc unsigned-reg :offset eax-offset
119 :from (:argument 1) :to (:result 0)) eax)
122 (inst shl eax (- n-widetag-bits 2))
123 (inst mov al-tn (make-ea :byte :base x :disp (- other-pointer-lowtag)))
124 (storew eax x 0 other-pointer-lowtag)
127 (define-vop (make-fixnum)
128 (:args (ptr :scs (any-reg descriptor-reg) :target res))
129 (:results (res :scs (any-reg descriptor-reg)))
131 ;; Some code (the hash table code) depends on this returning a
132 ;; positive number so make sure it does.
137 (define-vop (make-other-immediate-type)
138 (:args (val :scs (any-reg descriptor-reg) :target res)
139 (type :scs (unsigned-reg immediate)))
140 (:results (res :scs (any-reg descriptor-reg) :from (:argument 0)))
143 (inst shl res (- n-widetag-bits 2))
144 (inst or res (sc-case type
146 (immediate (tn-value type))))))
150 (define-vop (dynamic-space-free-pointer)
151 (:results (int :scs (sap-reg)))
152 (:result-types system-area-pointer)
153 (:translate dynamic-space-free-pointer)
156 (load-symbol-value int *allocation-pointer*)))
158 (define-vop (binding-stack-pointer-sap)
159 (:results (int :scs (sap-reg)))
160 (:result-types system-area-pointer)
161 (:translate binding-stack-pointer-sap)
164 (load-binding-stack-pointer int)))
166 (defknown (setf binding-stack-pointer-sap)
167 (system-area-pointer) system-area-pointer ())
169 (define-vop (set-binding-stack-pointer-sap)
170 (:args (new-value :scs (sap-reg) :target int))
171 (:arg-types system-area-pointer)
172 (:results (int :scs (sap-reg)))
173 (:result-types system-area-pointer)
174 (:translate (setf binding-stack-pointer-sap))
177 (store-binding-stack-pointer new-value)
178 (move int new-value)))
180 (define-vop (control-stack-pointer-sap)
181 (:results (int :scs (sap-reg)))
182 (:result-types system-area-pointer)
183 (:translate control-stack-pointer-sap)
188 ;;;; code object frobbing
190 (define-vop (code-instructions)
191 (:translate code-instructions)
193 (:args (code :scs (descriptor-reg) :to (:result 0)))
194 (:results (sap :scs (sap-reg) :from (:argument 0)))
195 (:result-types system-area-pointer)
197 (loadw sap code 0 other-pointer-lowtag)
198 (inst shr sap n-widetag-bits)
199 (inst lea sap (make-ea :byte :base code :index sap :scale 4
200 :disp (- other-pointer-lowtag)))))
202 (define-vop (compute-fun)
203 (:args (code :scs (descriptor-reg) :to (:result 0))
204 (offset :scs (signed-reg unsigned-reg) :to (:result 0)))
205 (:arg-types * positive-fixnum)
206 (:results (func :scs (descriptor-reg) :from (:argument 0)))
208 (loadw func code 0 other-pointer-lowtag)
209 (inst shr func n-widetag-bits)
211 (make-ea :byte :base offset :index func :scale 4
212 :disp (- fun-pointer-lowtag other-pointer-lowtag)))
213 (inst add func code)))
215 (define-vop (%simple-fun-self)
217 (:translate %simple-fun-self)
218 (:args (function :scs (descriptor-reg)))
219 (:results (result :scs (descriptor-reg)))
221 (loadw result function simple-fun-self-slot fun-pointer-lowtag)
223 (make-ea :byte :base result
224 :disp (- fun-pointer-lowtag
225 (* simple-fun-code-offset n-word-bytes))))))
227 ;;; The closure function slot is a pointer to raw code on X86 instead
228 ;;; of a pointer to the code function object itself. This VOP is used
229 ;;; to reference the function object given the closure object.
230 (define-source-transform %closure-fun (closure)
231 `(%simple-fun-self ,closure))
233 (define-vop (%set-fun-self)
235 (:translate (setf %simple-fun-self))
236 (:args (new-self :scs (descriptor-reg) :target result :to :result)
237 (function :scs (descriptor-reg) :to :result))
238 (:temporary (:sc any-reg :from (:argument 0) :to :result) temp)
239 (:results (result :scs (descriptor-reg)))
241 (inst lea temp (make-ea-for-object-slot new-self simple-fun-code-offset
243 (storew temp function simple-fun-self-slot fun-pointer-lowtag)
244 (move result new-self)))
246 ;;;; other miscellaneous VOPs
248 (defknown sb!unix::receive-pending-interrupt () (values))
249 (define-vop (sb!unix::receive-pending-interrupt)
251 (:translate sb!unix::receive-pending-interrupt)
253 (inst break pending-interrupt-trap)))
256 (defknown current-thread-offset-sap ((unsigned-byte 32))
257 system-area-pointer (flushable))
260 (define-vop (current-thread-offset-sap)
261 (:results (sap :scs (sap-reg)))
262 (:result-types system-area-pointer)
263 (:translate current-thread-offset-sap)
264 (:args (n :scs (unsigned-reg) :target sap))
265 (:arg-types unsigned-num)
268 (inst fs-segment-prefix)
269 (inst mov sap (make-ea :dword :disp 0 :index n :scale 4))))
273 (inst break halt-trap)))
275 (defknown float-wait () (values))
276 (define-vop (float-wait)
278 (:translate float-wait)
280 (:save-p :compute-only)
282 (note-next-instruction vop :internal-error)
285 ;;;; dynamic vop count collection support
288 (define-vop (count-me)
289 (:args (count-vector :scs (descriptor-reg)))
292 (inst inc (make-ea-for-vector-data count-vector :offset index))))