src/compiler/sparc/system.lisp

   1 ;;;; Sparc 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)))
  20   (:results (result :scs (unsigned-reg)))
  21   (:result-types positive-fixnum)
  22   (:generator 1
  23     (inst and result object lowtag-mask)))
  24
  25 (define-vop (widetag-of)
  26   (:translate widetag-of)
  27   (:policy :fast-safe)
  28   (:args (object :scs (descriptor-reg) :to (:eval 1)))
  29   (:results (result :scs (unsigned-reg) :from (:eval 0)))
  30   (:result-types positive-fixnum)
  31   (:generator 6
  32     ;; Grab the lowtag.
  33     (inst andcc result object lowtag-mask)
  34     ;; Check for various pointer types.
  35     (inst cmp result list-pointer-lowtag)
  36     (inst b :eq done)
  37     (inst cmp result other-pointer-lowtag)
  38     (inst b :eq other-pointer)
  39     (inst cmp result fun-pointer-lowtag)
  40     (inst b :eq function-pointer)
  41     (inst cmp result instance-pointer-lowtag)
  42     (inst b :eq done)
  43     ;; Okay, it is an immediate.  If fixnum, we want zero.  Otherwise,
  44     ;; we want the low 8 bits.
  45     (inst andcc zero-tn object #b11)
  46     (inst b :eq done)
  47     (inst li result 0)
  48     ;; It wasn't a fixnum, so get the low 8 bits.
  49     (inst b done)
  50     (inst and result object widetag-mask)
  51
  52     FUNCTION-POINTER
  53     (inst b done)
  54     (load-type result object (- fun-pointer-lowtag))
  55
  56     OTHER-POINTER
  57     (load-type result object (- other-pointer-lowtag))
  58
  59     DONE))
  60
  61
  62 (define-vop (fun-subtype)
  63   (:translate fun-subtype)
  64   (:policy :fast-safe)
  65   (:args (function :scs (descriptor-reg)))
  66   (:results (result :scs (unsigned-reg)))
  67   (:result-types positive-fixnum)
  68   (:generator 6
  69     (load-type result function (- fun-pointer-lowtag))))
  70
  71 ;;; Is this VOP dead? I can't see anywhere that it is used... -- CSR,
  72 ;;; 2002-06-21
  73 (define-vop (set-fun-subtype)
  74   (:translate (setf fun-subtype))
  75   (:policy :fast-safe)
  76   (:args (type :scs (unsigned-reg) :target result)
  77          (function :scs (descriptor-reg)))
  78   (:arg-types positive-fixnum *)
  79   (:results (result :scs (unsigned-reg)))
  80   (:result-types positive-fixnum)
  81   (:generator 6
  82     ;; FIXME: I don't understand what this hardcoded 3 is doing
  83     ;; here. -- CSR, 2002-02-08
  84     (inst stb type function (- 3 fun-pointer-lowtag))
  85     (move result type)))
  86
  87 (define-vop (get-header-data)
  88   (:translate get-header-data)
  89   (:policy :fast-safe)
  90   (:args (x :scs (descriptor-reg)))
  91   (:results (res :scs (unsigned-reg)))
  92   (:result-types positive-fixnum)
  93   (:generator 6
  94     (loadw res x 0 other-pointer-lowtag)
  95     (inst srl res res n-widetag-bits)))
  96
  97 (define-vop (get-closure-length)
  98   (:translate get-closure-length)
  99   (:policy :fast-safe)
 100   (:args (x :scs (descriptor-reg)))
 101   (:results (res :scs (unsigned-reg)))
 102   (:result-types positive-fixnum)
 103   (:generator 6
 104     (loadw res x 0 fun-pointer-lowtag)
 105     (inst srl res res n-widetag-bits)))
 106
 107 (define-vop (set-header-data)
 108   (:translate set-header-data)
 109   (:policy :fast-safe)
 110   (:args (x :scs (descriptor-reg) :target res)
 111          (data :scs (any-reg immediate zero)))
 112   (:arg-types * positive-fixnum)
 113   (:results (res :scs (descriptor-reg)))
 114   (:temporary (:scs (non-descriptor-reg)) t1 t2)
 115   (:generator 6
 116     (loadw t1 x 0 other-pointer-lowtag)
 117     (inst and t1 widetag-mask)
 118     (sc-case data
 119       (any-reg
 120        (inst sll t2 data (- n-widetag-bits 2))
 121        (inst or t1 t2))
 122       (immediate
 123        (inst or t1 (ash (tn-value data) n-widetag-bits)))
 124       (zero))
 125     (storew t1 x 0 other-pointer-lowtag)
 126     (move res x)))
 127
 128
 129 (define-vop (make-fixnum)
 130   (:args (ptr :scs (any-reg descriptor-reg)))
 131   (:results (res :scs (any-reg descriptor-reg)))
 132   (:generator 1
 133     ;; FIXME: CMUCL comment:
 134     ;; Some code (the hash table code) depends on this returning a
 135     ;; positive number so make sure it does.
 136     (inst sll res ptr 3)
 137     (inst srl res res 1)))
 138
 139 (define-vop (make-other-immediate-type)
 140   (:args (val :scs (any-reg descriptor-reg))
 141          (type :scs (any-reg descriptor-reg immediate)
 142                :target temp))
 143   (:results (res :scs (any-reg descriptor-reg)))
 144   (:temporary (:scs (non-descriptor-reg)) temp)
 145   (:generator 2
 146     (sc-case type
 147       (immediate
 148        (inst sll temp val n-widetag-bits)
 149        (inst or res temp (tn-value type)))
 150       (t
 151        (inst sra temp type 2)
 152        (inst sll res val (- n-widetag-bits 2))
 153        (inst or res res temp)))))
 154
 155 \f
 156 ;;;; allocation
 157
 158 (define-vop (dynamic-space-free-pointer)
 159   (:results (int :scs (sap-reg)))
 160   (:result-types system-area-pointer)
 161   (:translate dynamic-space-free-pointer)
 162   (:policy :fast-safe)
 163   (:generator 1
 164     (move int alloc-tn)))
 165
 166 (define-vop (binding-stack-pointer-sap)
 167   (:results (int :scs (sap-reg)))
 168   (:result-types system-area-pointer)
 169   (:translate binding-stack-pointer-sap)
 170   (:policy :fast-safe)
 171   (:generator 1
 172     (move int bsp-tn)))
 173
 174 (define-vop (control-stack-pointer-sap)
 175   (:results (int :scs (sap-reg)))
 176   (:result-types system-area-pointer)
 177   (:translate control-stack-pointer-sap)
 178   (:policy :fast-safe)
 179   (:generator 1
 180     (move int csp-tn)))
 181
 182 \f
 183 ;;;; code object frobbing.
 184
 185 (define-vop (code-instructions)
 186   (:translate code-instructions)
 187   (:policy :fast-safe)
 188   (:args (code :scs (descriptor-reg)))
 189   (:temporary (:scs (non-descriptor-reg)) ndescr)
 190   (:results (sap :scs (sap-reg)))
 191   (:result-types system-area-pointer)
 192   (:generator 10
 193     (loadw ndescr code 0 other-pointer-lowtag)
 194     (inst srl ndescr n-widetag-bits)
 195     (inst sll ndescr word-shift)
 196     (inst sub ndescr other-pointer-lowtag)
 197     (inst add sap code ndescr)))
 198
 199 (define-vop (compute-fun)
 200   (:args (code :scs (descriptor-reg))
 201          (offset :scs (signed-reg unsigned-reg)))
 202   (:arg-types * positive-fixnum)
 203   (:results (func :scs (descriptor-reg)))
 204   (:temporary (:scs (non-descriptor-reg)) ndescr)
 205   (:generator 10
 206     (loadw ndescr code 0 other-pointer-lowtag)
 207     (inst srl ndescr n-widetag-bits)
 208     (inst sll ndescr word-shift)
 209     (inst add ndescr offset)
 210     (inst add ndescr (- fun-pointer-lowtag other-pointer-lowtag))
 211     (inst add func code ndescr)))
 212
 213
 214 \f
 215 ;;;; other random VOPs.
 216
 217
 218 (defknown sb!unix::receive-pending-interrupt () (values))
 219 (define-vop (sb!unix::receive-pending-interrupt)
 220   (:policy :fast-safe)
 221   (:translate sb!unix::receive-pending-interrupt)
 222   (:generator 1
 223     (inst unimp pending-interrupt-trap)))
 224
 225 #!+sb-thread
 226 (error "write a VOP for CURRENT-THREAD-OFFSET-SAP")
 227
 228 (define-vop (halt)
 229   (:generator 1
 230     (inst unimp halt-trap)))
 231
 232
 233 \f
 234 ;;;; dynamic VOP count collection support
 235
 236 (define-vop (count-me)
 237   (:args (count-vector :scs (descriptor-reg)))
 238   (:info index)
 239   (:temporary (:scs (non-descriptor-reg)) count)
 240   (:generator 1
 241     (let ((offset
 242            (- (* (+ index vector-data-offset) n-word-bytes)
 243               other-pointer-lowtag)))
 244       (aver (typep offset '(signed-byte 13)))
 245       (inst ld count count-vector offset)
 246       (inst add count 1)
 247       (inst st count count-vector offset))))