src/compiler/ppc/parms.lisp

   1 ;;;; This file contains some parameterizations of various VM
   2 ;;;; attributes for the PPC.  This file is separate from other stuff so
   3 ;;;; that it can be compiled and loaded earlier.
   4
   5 ;;;; This software is part of the SBCL system. See the README file for
   6 ;;;; more information.
   7 ;;;;
   8 ;;;; This software is derived from the CMU CL system, which was
   9 ;;;; written at Carnegie Mellon University and released into the
  10 ;;;; public domain. The software is in the public domain and is
  11 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
  12 ;;;; files for more information.
  13
  14 (in-package "SB!VM")
  15
  16 ;;; number of bits per word where a word holds one lisp descriptor
  17 (defconstant n-word-bits 32)
  18
  19 ;;; the natural width of a machine word (as seen in e.g. register width,
  20 ;;; address space)
  21 (defconstant n-machine-word-bits 32)
  22
  23 ;;; flags for the generational garbage collector
  24 (defconstant pseudo-atomic-interrupted-flag 1)
  25 (defconstant pseudo-atomic-flag 4)
  26
  27 (defconstant float-sign-shift 31)
  28
  29 (defconstant single-float-bias 126)
  30 (defconstant-eqx single-float-exponent-byte (byte 8 23) #'equalp)
  31 (defconstant-eqx single-float-significand-byte (byte 23 0) #'equalp)
  32 (defconstant single-float-normal-exponent-min 1)
  33 (defconstant single-float-normal-exponent-max 254)
  34 (defconstant single-float-hidden-bit (ash 1 23))
  35 (defconstant single-float-trapping-nan-bit (ash 1 22))
  36
  37 (defconstant double-float-bias 1022)
  38 (defconstant-eqx double-float-exponent-byte (byte 11 20) #'equalp)
  39 (defconstant-eqx double-float-significand-byte (byte 20 0) #'equalp)
  40 (defconstant double-float-normal-exponent-min 1)
  41 (defconstant double-float-normal-exponent-max #x7FE)
  42 (defconstant double-float-hidden-bit (ash 1 20))
  43 (defconstant double-float-trapping-nan-bit (ash 1 19))
  44
  45 (defconstant single-float-digits
  46   (+ (byte-size single-float-significand-byte) 1))
  47
  48 (defconstant double-float-digits
  49   (+ (byte-size double-float-significand-byte) n-word-bits 1))
  50
  51
  52 (defconstant float-inexact-trap-bit (ash 1 0))
  53 (defconstant float-divide-by-zero-trap-bit (ash 1 1))
  54 (defconstant float-underflow-trap-bit (ash 1 2))
  55 (defconstant float-overflow-trap-bit (ash 1 3))
  56 (defconstant float-invalid-trap-bit (ash 1 4))
  57
  58 (defconstant float-round-to-nearest 0)
  59 (defconstant float-round-to-zero 1)
  60 (defconstant float-round-to-positive 2)
  61 (defconstant float-round-to-negative 3)
  62
  63 (defconstant-eqx float-rounding-mode (byte 2 0) #'equalp)         ; RD
  64 ;;; FIXME I: Beware, all ye who trespass here. Despite its name,
  65 ;;; FLOAT-STICKY-BITS is not the byte specifier for sticky bits in the
  66 ;;; floating point control word. It is more like "accrued exceptions"
  67 ;;; where FLOAT-EXCEPTIONS-BYTE is "current exceptions". Consequently,
  68 ;;; on architectures where there is no "current exceptions"
  69 ;;; FLOAT-EXCEPTIONS-BYTE and FLOAT-STICKY-BITS had better be the
  70 ;;; same.
  71 ;;;
  72 ;;; FIXME II: So, I've now documented this in comments in the PowerPC
  73 ;;; tree. This may not make it easy to find for when new architectures
  74 ;;; get backends written...
  75 ;;;
  76 ;;; CSR, 2002-06-11
  77 (defconstant-eqx float-sticky-bits (byte 5 25) #'equalp)
  78 (defconstant-eqx float-traps-byte (byte 5 3) #'equalp)
  79 (defconstant-eqx float-exceptions-byte (byte 5 25) #'equalp)      ; cexc
  80
  81 (defconstant float-fast-bit 2)         ; Non-IEEE mode
  82
  83 \f
  84 ;;;; Where to put the different spaces.
  85
  86 ;;; On non-gencgc we need large dynamic and static spaces for PURIFY
  87 #!-gencgc
  88 (progn
  89   (defconstant read-only-space-start #x04000000)
  90   (defconstant read-only-space-end   #x07ff8000)
  91   (defconstant static-space-start    #x08000000)
  92   (defconstant static-space-end      #x097fff00)
  93
  94   (defconstant linkage-table-space-start #x0a000000)
  95   (defconstant linkage-table-space-end   #x0b000000))
  96
  97 ;;; While on gencgc we don't.
  98 #!+gencgc
  99 (!gencgc-space-setup #x04000000
 100                      :dynamic-space-start
 101                      #!+linux   #x4f000000
 102                      #!+netbsd  #x4f000000
 103                      #!+openbsd #x4f000000
 104                      #!+darwin  #x10000000)
 105
 106 (defconstant linkage-table-entry-size 16)
 107
 108 #!+linux
 109 (progn
 110   #!-gencgc
 111   (progn
 112     (defconstant dynamic-0-space-start #x4f000000)
 113     (defconstant dynamic-0-space-end   #x66fff000)
 114     (defconstant dynamic-1-space-start #x67000000)
 115     (defconstant dynamic-1-space-end   #x7efff000)))
 116
 117 #!+netbsd
 118 (progn
 119   #!-gencgc
 120   (progn
 121     (defconstant dynamic-0-space-start #x4f000000)
 122     (defconstant dynamic-0-space-end   #x66fff000)
 123     (defconstant dynamic-1-space-start #x67000000)
 124     (defconstant dynamic-1-space-end   #x7efff000)))
 125
 126 ;;; Text and data segments start at #x01800000.  Range for randomized
 127 ;;; malloc() starts #x20000000 (MAXDSIZ) after end of data seg and
 128 ;;; extends 256 MB.  Use 512 - 64 MB for dynamic space so we can run
 129 ;;; under default resource limits.
 130 ;;; FIXME: MAXDSIZ is a kernel parameter, and can vary as high as 1GB.
 131 ;;; These parameters should probably be tested under such a configuration,
 132 ;;; as rare as it might or might not be.
 133 #!+openbsd
 134 (progn
 135   #!-gencgc
 136   (progn
 137     (defconstant dynamic-0-space-start #x4f000000)
 138     (defconstant dynamic-0-space-end   #x5cfff000)
 139     (defconstant dynamic-1-space-start #x5f000000)
 140     (defconstant dynamic-1-space-end   #x6cfff000)))
 141
 142 #!+darwin
 143 (progn
 144   #!-gencgc
 145   (progn
 146     (defconstant dynamic-0-space-start #x10000000)
 147     (defconstant dynamic-0-space-end   #x3ffff000)
 148
 149     (defconstant dynamic-1-space-start #x40000000)
 150     (defconstant dynamic-1-space-end   #x6ffff000)))
 151 \f
 152 ;;;; Other miscellaneous constants.
 153
 154 (defenum (:start 8)
 155   halt-trap
 156   pending-interrupt-trap
 157   error-trap
 158   cerror-trap
 159   breakpoint-trap
 160   fun-end-breakpoint-trap
 161   after-breakpoint-trap
 162   single-step-around-trap
 163   single-step-before-trap)
 164 \f
 165 ;;;; Static symbols.
 166
 167
 168 ;;; These symbols are loaded into static space directly after NIL so
 169 ;;; that the system can compute their address by adding a constant
 170 ;;; amount to NIL.
 171 ;;;
 172 ;;; The fdefn objects for the static functions are loaded into static
 173 ;;; space directly after the static symbols.  That way, the raw-addr
 174 ;;; can be loaded directly out of them by indirecting relative to NIL.
 175 ;;;
 176 (defparameter *static-symbols*
 177   (append
 178    *common-static-symbols*
 179    *c-callable-static-symbols*
 180    '(
 181      #!+gencgc *restart-lisp-function*
 182
 183      ;; CLH: 20060210 Taken from x86-64/parms.lisp per JES' suggestion
 184      ;; Needed for callbacks to work across saving cores. see
 185      ;; ALIEN-CALLBACK-ASSEMBLER-WRAPPER in c-call.lisp for gory
 186      ;; details.
 187      sb!alien::*enter-alien-callback*)))
 188
 189 (defparameter *static-funs*
 190   '(length
 191     two-arg-+
 192     two-arg--
 193     two-arg-*
 194     two-arg-/
 195     two-arg-<
 196     two-arg->
 197     two-arg-=
 198     two-arg-<=
 199     two-arg->=
 200     two-arg-/=
 201     eql
 202     %negate
 203     two-arg-and
 204     two-arg-ior
 205     two-arg-xor
 206     two-arg-eqv
 207     two-arg-gcd
 208     two-arg-lcm))