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 (widetag-of)
  17   (:translate widetag-of)
  18   (:policy :fast-safe)
  19   (:args (object :scs (descriptor-reg) :to (:eval 1)))
  20   (:results (result :scs (unsigned-reg) :from (:eval 0)))
  21   (:result-types positive-fixnum)
  22   (:generator 6
  23     ;; Grab the lowtag.
  24     (inst andcc result object lowtag-mask)
  25     ;; Check for various pointer types.
  26     (inst cmp result list-pointer-lowtag)
  27     (inst b :eq done)
  28     (inst cmp result other-pointer-lowtag)
  29     (inst b :eq other-pointer)
  30     (inst cmp result fun-pointer-lowtag)
  31     (inst b :eq function-pointer)
  32     (inst cmp result instance-pointer-lowtag)
  33     (inst b :eq done)
  34     ;; Okay, it is an immediate.  If fixnum, we want zero.  Otherwise,
  35     ;; we want the low 8 bits.
  36     (inst andcc zero-tn object fixnum-tag-mask)
  37     (inst b :eq done)
  38     (inst li result 0)
  39     ;; It wasn't a fixnum, so get the low 8 bits.
  40     (inst b done)
  41     (inst and result object widetag-mask)
  42
  43     FUNCTION-POINTER
  44     (inst b done)
  45     (load-type result object (- fun-pointer-lowtag))
  46
  47     OTHER-POINTER
  48     (load-type result object (- other-pointer-lowtag))
  49
  50     DONE))
  51
  52 (define-vop (%other-pointer-widetag)
  53   (:translate %other-pointer-widetag)
  54   (:policy :fast-safe)
  55   (:args (object :scs (descriptor-reg)))
  56   (:results (result :scs (unsigned-reg)))
  57   (:result-types positive-fixnum)
  58   (:generator 6
  59     (load-type result object (- other-pointer-lowtag))))
  60
  61 (define-vop (fun-subtype)
  62   (:translate fun-subtype)
  63   (:policy :fast-safe)
  64   (:args (function :scs (descriptor-reg)))
  65   (:results (result :scs (unsigned-reg)))
  66   (:result-types positive-fixnum)
  67   (:generator 6
  68     (load-type result function (- fun-pointer-lowtag))))
  69
  70 (define-vop (get-header-data)
  71   (:translate get-header-data)
  72   (:policy :fast-safe)
  73   (:args (x :scs (descriptor-reg)))
  74   (:results (res :scs (unsigned-reg)))
  75   (:result-types positive-fixnum)
  76   (:generator 6
  77     (loadw res x 0 other-pointer-lowtag)
  78     (inst srl res res n-widetag-bits)))
  79
  80 (define-vop (get-closure-length)
  81   (:translate get-closure-length)
  82   (:policy :fast-safe)
  83   (:args (x :scs (descriptor-reg)))
  84   (:results (res :scs (unsigned-reg)))
  85   (:result-types positive-fixnum)
  86   (:generator 6
  87     (loadw res x 0 fun-pointer-lowtag)
  88     (let* ((n-size-bits (integer-length short-header-max-words))
  89            (lshift (- n-word-bits (+ n-size-bits n-widetag-bits))))
  90       ;; To avoid constructing a 15-bit mask which would require another
  91       ;; instruction, (ldb (byte n-size-bits n-widetag-bits) ...)
  92       ;; is done as "shift left, shift right" discarding bits out both ends.
  93       (inst sll res res lshift)
  94       (inst srl res res (+ lshift n-widetag-bits)))))
  95
  96 (define-vop (set-header-data)
  97   (:translate set-header-data)
  98   (:policy :fast-safe)
  99   (:args (x :scs (descriptor-reg) :target res)
 100          (data :scs (any-reg immediate zero)))
 101   (:arg-types * positive-fixnum)
 102   (:results (res :scs (descriptor-reg)))
 103   (:temporary (:scs (non-descriptor-reg)) t1 t2)
 104   (:generator 6
 105     (loadw t1 x 0 other-pointer-lowtag)
 106     (inst and t1 widetag-mask)
 107     (sc-case data
 108       (any-reg
 109        (inst sll t2 data (- n-widetag-bits n-fixnum-tag-bits))
 110        (inst or t1 t2))
 111       (immediate
 112        (let ((val (ash (tn-value data) n-widetag-bits)))
 113          (cond ((typep val '(signed-byte 13))
 114                 (inst or t1 val))
 115                (t
 116                 (inst li t2 val)
 117                 (inst or t1 t2)))))
 118       (zero))
 119     (storew t1 x 0 other-pointer-lowtag)
 120     (move res x)))
 121
 122
 123 (define-vop (pointer-hash)
 124   (:translate pointer-hash)
 125   (:args (ptr :scs (any-reg descriptor-reg)))
 126   (:results (res :scs (any-reg descriptor-reg)))
 127   (:policy :fast-safe)
 128   (:generator 1
 129     ;; FIXME: It would be better if this would mask the lowtag,
 130     ;; and shift the result into a positive fixnum like on x86.
 131     (inst sll res ptr 3)
 132     (inst srl res res 1)))
 133
 134 \f
 135 ;;;; allocation
 136
 137 (define-vop (dynamic-space-free-pointer)
 138   (:results (int :scs (sap-reg)))
 139   (:result-types system-area-pointer)
 140   (:translate dynamic-space-free-pointer)
 141   (:policy :fast-safe)
 142   (:generator 1
 143     (move int alloc-tn)))
 144
 145 (define-vop (binding-stack-pointer-sap)
 146   (:results (int :scs (sap-reg)))
 147   (:result-types system-area-pointer)
 148   (:translate binding-stack-pointer-sap)
 149   (:policy :fast-safe)
 150   (:generator 1
 151     (move int bsp-tn)))
 152
 153 (define-vop (control-stack-pointer-sap)
 154   (:results (int :scs (sap-reg)))
 155   (:result-types system-area-pointer)
 156   (:translate control-stack-pointer-sap)
 157   (:policy :fast-safe)
 158   (:generator 1
 159     (move int csp-tn)))
 160
 161 \f
 162 ;;;; code object frobbing.
 163
 164 (define-vop (code-instructions)
 165   (:translate code-instructions)
 166   (:policy :fast-safe)
 167   (:args (code :scs (descriptor-reg)))
 168   (:temporary (:scs (non-descriptor-reg)) ndescr)
 169   (:results (sap :scs (sap-reg)))
 170   (:result-types system-area-pointer)
 171   (:generator 10
 172     (loadw ndescr code 0 other-pointer-lowtag)
 173     (inst srl ndescr n-widetag-bits)
 174     (inst sll ndescr word-shift)
 175     (inst sub ndescr other-pointer-lowtag)
 176     (inst add sap code ndescr)))
 177
 178 (define-vop (compute-fun)
 179   (:args (code :scs (descriptor-reg))
 180          (offset :scs (signed-reg unsigned-reg)))
 181   (:arg-types * positive-fixnum)
 182   (:results (func :scs (descriptor-reg)))
 183   (:temporary (:scs (non-descriptor-reg)) ndescr)
 184   (:generator 10
 185     (loadw ndescr code 0 other-pointer-lowtag)
 186     (inst srl ndescr n-widetag-bits)
 187     (inst sll ndescr word-shift)
 188     (inst add ndescr offset)
 189     (inst add ndescr (- fun-pointer-lowtag other-pointer-lowtag))
 190     (inst add func code ndescr)))
 191
 192
 193 \f
 194 ;;;; other random VOPs.
 195
 196
 197 (defknown sb!unix::receive-pending-interrupt () (values))
 198 (define-vop (sb!unix::receive-pending-interrupt)
 199   (:policy :fast-safe)
 200   (:translate sb!unix::receive-pending-interrupt)
 201   (:generator 1
 202     (inst unimp pending-interrupt-trap)))
 203
 204 #!+sb-thread
 205 (error "write a VOP for CURRENT-THREAD-OFFSET-SAP")
 206
 207 (define-vop (halt)
 208   (:generator 1
 209     (inst unimp halt-trap)))
 210
 211
 212 \f
 213 ;;;; dynamic VOP count collection support
 214
 215 (define-vop (count-me)
 216   (:args (count-vector :scs (descriptor-reg)))
 217   (:info index)
 218   (:temporary (:scs (non-descriptor-reg)) count)
 219   (:generator 1
 220     (let ((offset
 221            (- (* (+ index vector-data-offset) n-word-bytes)
 222               other-pointer-lowtag)))
 223       (aver (typep offset '(signed-byte 13)))
 224       (inst ld count count-vector offset)
 225       (inst add count 1)
 226       (inst st count count-vector offset))))
 227
 228 ;;;; Dummy definition for a spin-loop hint VOP
 229 (define-vop (spin-loop-hint)
 230   (:translate spin-loop-hint)
 231   (:policy :fast-safe)
 232   (:generator 0))