src/compiler/x86/system.lisp

   1 ;;;; x86 VM definitions of various system hacking operations
   2
   3 ;;;; This software is part of the SBCL system. See the README file for
   4 ;;;; more information.
   5 ;;;;
   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.
  11
  12 (in-package "SB!VM")
  13 \f
  14 ;;;; type frobbing VOPs
  15
  16 (define-vop (lowtag-of)
  17   (:translate lowtag-of)
  18   (:policy :fast-safe)
  19   (:args (object :scs (any-reg descriptor-reg control-stack)
  20                  :target result))
  21   (:results (result :scs (unsigned-reg)))
  22   (:result-types positive-fixnum)
  23   (:generator 1
  24     (move result object)
  25     (inst and result lowtag-mask)))
  26
  27 (define-vop (widetag-of)
  28   (:translate widetag-of)
  29   (:policy :fast-safe)
  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)
  34   (:generator 6
  35     (inst mov eax object)
  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)
  41
  42     ;; Pick off structures and list pointers.
  43     (inst test al-tn 1)
  44     (inst jmp :ne done)
  45
  46     ;; Pick off fixnums.
  47     (inst and al-tn 3)
  48     (inst jmp :e done)
  49
  50     ;; must be an other immediate
  51     (inst mov eax object)
  52     (inst jmp done)
  53
  54     FUNCTION-PTR
  55     (load-type al-tn object (- fun-pointer-lowtag))
  56     (inst jmp done)
  57
  58     OTHER-PTR
  59     (load-type al-tn object (- other-pointer-lowtag))
  60
  61     DONE
  62     (inst movzx result al-tn)))
  63 \f
  64 (define-vop (fun-subtype)
  65   (:translate fun-subtype)
  66   (:policy :fast-safe)
  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)
  71   (:generator 6
  72     (load-type temp function (- fun-pointer-lowtag))
  73     (inst movzx result temp)))
  74
  75 (define-vop (set-fun-subtype)
  76   (:translate (setf fun-subtype))
  77   (:policy :fast-safe)
  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)
  83               eax)
  84   (:results (result :scs (unsigned-reg)))
  85   (:result-types positive-fixnum)
  86   (:generator 6
  87     (move eax type)
  88     (inst mov
  89           (make-ea :byte :base function :disp (- fun-pointer-lowtag))
  90           al-tn)
  91     (move result eax)))
  92
  93 (define-vop (get-header-data)
  94   (:translate get-header-data)
  95   (:policy :fast-safe)
  96   (:args (x :scs (descriptor-reg)))
  97   (:results (res :scs (unsigned-reg)))
  98   (:result-types positive-fixnum)
  99   (:generator 6
 100     (loadw res x 0 other-pointer-lowtag)
 101     (inst shr res n-widetag-bits)))
 102
 103 (define-vop (get-closure-length)
 104   (:translate get-closure-length)
 105   (:policy :fast-safe)
 106   (:args (x :scs (descriptor-reg)))
 107   (:results (res :scs (unsigned-reg)))
 108   (:result-types positive-fixnum)
 109   (:generator 6
 110     (loadw res x 0 fun-pointer-lowtag)
 111     (inst shr res n-widetag-bits)))
 112
 113 (define-vop (set-header-data)
 114   (:translate set-header-data)
 115   (:policy :fast-safe)
 116   (:args (x :scs (descriptor-reg) :target res :to (:result 0))
 117          (data :scs (any-reg) :target eax))
 118   (:arg-types * positive-fixnum)
 119   (:results (res :scs (descriptor-reg)))
 120   (:temporary (:sc unsigned-reg :offset eax-offset
 121                    :from (:argument 1) :to (:result 0)) eax)
 122   (:generator 6
 123     (move eax data)
 124     (inst shl eax (- n-widetag-bits 2))
 125     (inst mov al-tn (make-ea :byte :base x :disp (- other-pointer-lowtag)))
 126     (storew eax x 0 other-pointer-lowtag)
 127     (move res x)))
 128 \f
 129 (define-vop (make-fixnum)
 130   (:args (ptr :scs (any-reg descriptor-reg) :target res))
 131   (:results (res :scs (any-reg descriptor-reg)))
 132   (:generator 1
 133     ;; Some code (the hash table code) depends on this returning a
 134     ;; positive number so make sure it does.
 135     (move res ptr)
 136     (inst shl res 3)
 137     (inst shr res 1)))
 138
 139 (define-vop (make-other-immediate-type)
 140   (:args (val :scs (any-reg descriptor-reg) :target res)
 141          (type :scs (unsigned-reg immediate)))
 142   (:results (res :scs (any-reg descriptor-reg) :from (:argument 0)))
 143   (:generator 2
 144     (move res val)
 145     (inst shl res (- n-widetag-bits 2))
 146     (inst or res (sc-case type
 147                    (unsigned-reg type)
 148                    (immediate (tn-value type))))))
 149 \f
 150 ;;;; allocation
 151
 152 (define-vop (dynamic-space-free-pointer)
 153   (:results (int :scs (sap-reg)))
 154   (:result-types system-area-pointer)
 155   (:translate dynamic-space-free-pointer)
 156   (:policy :fast-safe)
 157   (:generator 1
 158     (load-symbol-value int *allocation-pointer*)))
 159
 160 (define-vop (binding-stack-pointer-sap)
 161   (:results (int :scs (sap-reg)))
 162   (:result-types system-area-pointer)
 163   (:translate binding-stack-pointer-sap)
 164   (:policy :fast-safe)
 165   (:generator 1
 166     (load-tl-symbol-value int *binding-stack-pointer*)))
 167
 168 (defknown (setf binding-stack-pointer-sap)
 169     (system-area-pointer) system-area-pointer ())
 170
 171 (define-vop (set-binding-stack-pointer-sap)
 172   (:args (new-value :scs (sap-reg) :target int))
 173   (:arg-types system-area-pointer)
 174   (:results (int :scs (sap-reg)))
 175   (:result-types system-area-pointer)
 176   #!+sb-thread (:temporary (:sc any-reg) temp)
 177   (:translate (setf binding-stack-pointer-sap))
 178   (:policy :fast-safe)
 179   (:generator 1
 180     (store-tl-symbol-value new-value *binding-stack-pointer* temp)
 181     (move int new-value)))
 182
 183 (define-vop (control-stack-pointer-sap)
 184   (:results (int :scs (sap-reg)))
 185   (:result-types system-area-pointer)
 186   (:translate control-stack-pointer-sap)
 187   (:policy :fast-safe)
 188   (:generator 1
 189     (move int esp-tn)))
 190 \f
 191 ;;;; code object frobbing
 192
 193 (define-vop (code-instructions)
 194   (:translate code-instructions)
 195   (:policy :fast-safe)
 196   (:args (code :scs (descriptor-reg) :to (:result 0)))
 197   (:results (sap :scs (sap-reg) :from (:argument 0)))
 198   (:result-types system-area-pointer)
 199   (:generator 10
 200     (loadw sap code 0 other-pointer-lowtag)
 201     (inst shr sap n-widetag-bits)
 202     (inst lea sap (make-ea :byte :base code :index sap :scale 4
 203                            :disp (- other-pointer-lowtag)))))
 204
 205 (define-vop (compute-fun)
 206   (:args (code :scs (descriptor-reg) :to (:result 0))
 207          (offset :scs (signed-reg unsigned-reg) :to (:result 0)))
 208   (:arg-types * positive-fixnum)
 209   (:results (func :scs (descriptor-reg) :from (:argument 0)))
 210   (:generator 10
 211     (loadw func code 0 other-pointer-lowtag)
 212     (inst shr func n-widetag-bits)
 213     (inst lea func
 214           (make-ea :byte :base offset :index func :scale 4
 215                    :disp (- fun-pointer-lowtag other-pointer-lowtag)))
 216     (inst add func code)))
 217
 218 (define-vop (%simple-fun-self)
 219   (:policy :fast-safe)
 220   (:translate %simple-fun-self)
 221   (:args (function :scs (descriptor-reg)))
 222   (:results (result :scs (descriptor-reg)))
 223   (:generator 3
 224     (loadw result function simple-fun-self-slot fun-pointer-lowtag)
 225     (inst lea result
 226           (make-ea :byte :base result
 227                    :disp (- fun-pointer-lowtag
 228                             (* simple-fun-code-offset n-word-bytes))))))
 229
 230 ;;; The closure function slot is a pointer to raw code on X86 instead
 231 ;;; of a pointer to the code function object itself. This VOP is used
 232 ;;; to reference the function object given the closure object.
 233 (define-source-transform %closure-fun (closure)
 234   `(%simple-fun-self ,closure))
 235
 236 (define-source-transform %funcallable-instance-fun (fin)
 237   `(%simple-fun-self ,fin))
 238
 239 (define-vop (%set-fun-self)
 240   (:policy :fast-safe)
 241   (:translate (setf %simple-fun-self))
 242   (:args (new-self :scs (descriptor-reg) :target result :to :result)
 243          (function :scs (descriptor-reg) :to :result))
 244   (:temporary (:sc any-reg :from (:argument 0) :to :result) temp)
 245   (:results (result :scs (descriptor-reg)))
 246   (:generator 3
 247     (inst lea temp
 248           (make-ea :byte :base new-self
 249                    :disp (- (ash simple-fun-code-offset word-shift)
 250                             fun-pointer-lowtag)))
 251     (storew temp function simple-fun-self-slot fun-pointer-lowtag)
 252     (move result new-self)))
 253
 254 ;;; KLUDGE: This seems to be some kind of weird override of the way
 255 ;;; that the objdef.lisp code would ordinarily set up the slot
 256 ;;; accessor. It's inherited from CMU CL, and it works, and naively
 257 ;;; deleting it seemed to cause problems, but it's not obvious why
 258 ;;; it's done this way. Any ideas? -- WHN 2001-08-02
 259 (defknown ((setf %funcallable-instance-fun)) (function function) function
 260   (unsafe))
 261 ;;; CMU CL comment:
 262 ;;;   We would have really liked to use a source-transform for this, but
 263 ;;;   they don't work with SETF functions.
 264 ;;; FIXME: Can't we just use DEFSETF or something?
 265 (deftransform (setf %funcallable-instance-fun) ((value fin))
 266   '(setf (%simple-fun-self fin) value))
 267 \f
 268 ;;;; other miscellaneous VOPs
 269
 270 (defknown sb!unix::receive-pending-interrupt () (values))
 271 (define-vop (sb!unix::receive-pending-interrupt)
 272   (:policy :fast-safe)
 273   (:translate sb!unix::receive-pending-interrupt)
 274   (:generator 1
 275     (inst break pending-interrupt-trap)))
 276
 277 (defknown current-thread-offset-sap ((unsigned-byte 32))
 278   system-area-pointer (flushable))
 279
 280 (define-vop (current-thread-offset-sap)
 281   (:results (sap :scs (sap-reg)))
 282   (:result-types system-area-pointer)
 283   (:translate current-thread-offset-sap)
 284   (:args (n :scs (unsigned-reg) #!+sb-thread :target #!+sb-thread sap))
 285   #!-sb-thread (:temporary (:sc unsigned-reg :target sap) temp)
 286   (:arg-types unsigned-num)
 287   (:policy :fast-safe)
 288   #!+sb-thread
 289   (:generator 2
 290     (inst fs-segment-prefix)
 291     (inst mov sap (make-ea :dword :disp 0 :index n :scale 4)))
 292   #!-sb-thread
 293   (:generator 2
 294     (inst mov temp (make-fixup (extern-alien-name "all_threads") :foreign))
 295     (inst mov sap (make-ea :dword :base temp :index n :scale 4))))
 296
 297 (define-vop (halt)
 298   (:generator 1
 299     (inst break halt-trap)))
 300
 301 (defknown float-wait () (values))
 302 (define-vop (float-wait)
 303   (:policy :fast-safe)
 304   (:translate float-wait)
 305   (:vop-var vop)
 306   (:save-p :compute-only)
 307   (:generator 1
 308     (note-next-instruction vop :internal-error)
 309     (inst wait)))
 310 \f
 311 ;;;; dynamic vop count collection support
 312
 313 #!+sb-dyncount
 314 (define-vop (count-me)
 315   (:args (count-vector :scs (descriptor-reg)))
 316   (:info index)
 317   (:generator 0
 318     (inst inc (make-ea :dword :base count-vector
 319                        :disp (- (* (+ vector-data-offset index) n-word-bytes)
 320                                 other-pointer-lowtag)))))