src/compiler/mips/system.lisp

   1 ;;;; MIPS 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
  14 \f
  15 ;;;; Type frobbing VOPs
  16
  17 (define-vop (lowtag-of)
  18   (:translate lowtag-of)
  19   (:policy :fast-safe)
  20   (:args (object :scs (any-reg descriptor-reg)))
  21   (:results (result :scs (unsigned-reg)))
  22   (:result-types positive-fixnum)
  23   (:generator 1
  24     (inst and result object lowtag-mask)))
  25
  26 (define-vop (widetag-of)
  27   (:translate widetag-of)
  28   (:policy :fast-safe)
  29   (:args (object :scs (descriptor-reg)))
  30   (:temporary (:scs (non-descriptor-reg)) ndescr)
  31   (:results (result :scs (unsigned-reg)))
  32   (:result-types positive-fixnum)
  33   (:generator 6
  34     ;; Pick off objects with headers.
  35     (inst and ndescr object lowtag-mask)
  36     (inst xor ndescr other-pointer-lowtag)
  37     (inst beq ndescr other-ptr)
  38     (inst xor ndescr (logxor other-pointer-lowtag fun-pointer-lowtag))
  39     (inst beq ndescr function-ptr)
  40
  41     ;; Pick off fixnums.
  42     (inst and result object 3)
  43     (inst beq result done)
  44
  45     ;; Pick off structure and list pointers.
  46     (inst and result object 1)
  47     (inst bne result lowtag-only)
  48     (inst nop)
  49
  50       ;; Must be an other immediate.
  51     (inst b done)
  52     (inst and result object widetag-mask)
  53
  54     FUNCTION-PTR
  55     (load-type result object (- fun-pointer-lowtag))
  56     (inst b done)
  57     (inst nop)
  58
  59     LOWTAG-ONLY
  60     (inst b done)
  61     (inst and result object lowtag-mask)
  62
  63     OTHER-PTR
  64     (load-type result object (- other-pointer-lowtag))
  65     (inst nop)
  66
  67     DONE))
  68
  69 (define-vop (fun-subtype)
  70   (:translate fun-subtype)
  71   (:policy :fast-safe)
  72   (:args (function :scs (descriptor-reg)))
  73   (:results (result :scs (unsigned-reg)))
  74   (:result-types positive-fixnum)
  75   (:generator 6
  76     (load-type result function (- fun-pointer-lowtag))
  77     (inst nop)))
  78
  79 (define-vop (set-fun-subtype)
  80   (:translate (setf fun-subtype))
  81   (:policy :fast-safe)
  82   (:args (type :scs (unsigned-reg) :target result)
  83          (function :scs (descriptor-reg)))
  84   (:arg-types positive-fixnum *)
  85   (:results (result :scs (unsigned-reg)))
  86   (:result-types positive-fixnum)
  87   (:generator 6
  88     (inst sb type function (- fun-pointer-lowtag))
  89     (move result type)))
  90
  91
  92 (define-vop (get-header-data)
  93   (:translate get-header-data)
  94   (:policy :fast-safe)
  95   (:args (x :scs (descriptor-reg)))
  96   (:results (res :scs (unsigned-reg)))
  97   (:result-types positive-fixnum)
  98   (:generator 6
  99     (loadw res x 0 other-pointer-lowtag)
 100     (inst srl res res n-widetag-bits)))
 101
 102 (define-vop (get-closure-length)
 103   (:translate get-closure-length)
 104   (:policy :fast-safe)
 105   (:args (x :scs (descriptor-reg)))
 106   (:results (res :scs (unsigned-reg)))
 107   (:result-types positive-fixnum)
 108   (:generator 6
 109     (loadw res x 0 fun-pointer-lowtag)
 110     (inst srl res res n-widetag-bits)))
 111
 112 (define-vop (set-header-data)
 113   (:translate set-header-data)
 114   (:policy :fast-safe)
 115   (:args (x :scs (descriptor-reg) :target res)
 116          (data :scs (any-reg immediate zero)))
 117   (:arg-types * positive-fixnum)
 118   (:results (res :scs (descriptor-reg)))
 119   (:temporary (:scs (non-descriptor-reg)) t1 t2)
 120   (:generator 6
 121     (loadw t1 x 0 other-pointer-lowtag)
 122     (inst and t1 widetag-mask)
 123     (sc-case data
 124       (any-reg
 125        (inst sll t2 data (- n-widetag-bits 2))
 126        (inst or t1 t2))
 127       (immediate
 128        (inst or t1 (ash (tn-value data) n-widetag-bits)))
 129       (zero))
 130     (storew t1 x 0 other-pointer-lowtag)
 131     (move res x)))
 132
 133 (define-vop (pointer-hash)
 134   (:translate pointer-hash)
 135   (:args (ptr :scs (any-reg descriptor-reg)))
 136   (:results (res :scs (any-reg descriptor-reg)))
 137   (:policy :fast-safe)
 138   (:generator 1
 139     ;; FIXME: It would be better if this would mask the lowtag,
 140     ;; and shift the result into a positive fixnum like on x86.
 141     (inst sll res ptr 3)
 142     (inst srl res res 1)))
 143
 144 (define-vop (make-other-immediate-type)
 145   (:args (val :scs (any-reg descriptor-reg))
 146          (type :scs (any-reg descriptor-reg immediate)
 147                :target temp))
 148   (:results (res :scs (any-reg descriptor-reg)))
 149   (:temporary (:scs (non-descriptor-reg)) temp)
 150   (:generator 2
 151     (sc-case type
 152       ((immediate)
 153        (inst sll temp val n-widetag-bits)
 154        (inst or res temp (tn-value type)))
 155       (t
 156        (inst sra temp type 2)
 157        (inst sll res val (- n-widetag-bits 2))
 158        (inst or res res temp)))))
 159
 160 \f
 161 ;;;; Allocation
 162
 163 (define-vop (dynamic-space-free-pointer)
 164   (:results (int :scs (sap-reg)))
 165   (:result-types system-area-pointer)
 166   (:translate dynamic-space-free-pointer)
 167   (:policy :fast-safe)
 168   (:generator 1
 169     (move int alloc-tn)))
 170
 171 (define-vop (binding-stack-pointer-sap)
 172   (:results (int :scs (sap-reg)))
 173   (:result-types system-area-pointer)
 174   (:translate binding-stack-pointer-sap)
 175   (:policy :fast-safe)
 176   (:generator 1
 177     (move int bsp-tn)))
 178
 179 (define-vop (control-stack-pointer-sap)
 180   (:results (int :scs (sap-reg)))
 181   (:result-types system-area-pointer)
 182   (:translate control-stack-pointer-sap)
 183   (:policy :fast-safe)
 184   (:generator 1
 185     (move int csp-tn)))
 186
 187 \f
 188 ;;;; Code object frobbing.
 189
 190 (define-vop (code-instructions)
 191   (:translate code-instructions)
 192   (:policy :fast-safe)
 193   (:args (code :scs (descriptor-reg)))
 194   (:temporary (:scs (non-descriptor-reg)) ndescr)
 195   (:results (sap :scs (sap-reg)))
 196   (:result-types system-area-pointer)
 197   (:generator 10
 198     (loadw ndescr code 0 other-pointer-lowtag)
 199     (inst srl ndescr n-widetag-bits)
 200     (inst sll ndescr word-shift)
 201     (inst subu ndescr other-pointer-lowtag)
 202     (inst addu sap code ndescr)))
 203
 204 (define-vop (compute-fun)
 205   (:args (code :scs (descriptor-reg))
 206          (offset :scs (signed-reg unsigned-reg)))
 207   (:arg-types * positive-fixnum)
 208   (:results (func :scs (descriptor-reg)))
 209   (:temporary (:scs (non-descriptor-reg)) ndescr)
 210   (:generator 10
 211     (loadw ndescr code 0 other-pointer-lowtag)
 212     (inst srl ndescr n-widetag-bits)
 213     (inst sll ndescr word-shift)
 214     (inst addu ndescr offset)
 215     (inst addu ndescr (- fun-pointer-lowtag other-pointer-lowtag))
 216     (inst addu func code ndescr)))
 217
 218 \f
 219 ;;;; Other random VOPs.
 220
 221
 222 (defknown sb!unix::receive-pending-interrupt () (values))
 223 (define-vop (sb!unix::receive-pending-interrupt)
 224   (:policy :fast-safe)
 225   (:translate sb!unix::receive-pending-interrupt)
 226   (:generator 1
 227     (inst break 0 pending-interrupt-trap)))
 228
 229
 230 (define-vop (halt)
 231   (:generator 1
 232     (inst break 0 halt-trap)))
 233
 234 \f
 235 ;;;; Dynamic vop count collection support
 236
 237 (define-vop (count-me)
 238   (:args (count-vector :scs (descriptor-reg)))
 239   (:info index)
 240   (:temporary (:scs (non-descriptor-reg)) count)
 241   (:generator 1
 242     (let ((offset
 243            (- (* (+ index vector-data-offset) n-word-bytes) other-pointer-lowtag)))
 244       (inst lw count count-vector offset)
 245       (inst nop)
 246       (inst addu count 1)
 247       (inst sw count count-vector offset))))