src/compiler/arm64/parms.lisp

   1 ;;;; This file contains some parameterizations of various VM
   2 ;;;; attributes for the ARM.  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 (def!constant n-word-bits 64)
  18
  19 ;;; the natural width of a machine word (as seen in e.g. register width,
  20 ;;; address space)
  21 (def!constant n-machine-word-bits 64)
  22
  23 ;;; number of bits per byte where a byte is the smallest addressable
  24 ;;; object
  25 (def!constant n-byte-bits 8)
  26
  27 ;;; Floating-point related constants, both format descriptions and FPU
  28 ;;; control register descriptions.  These don't exactly match up with
  29 ;;; what the machine manuals say because the Common Lisp standard
  30 ;;; defines floating-point values somewhat differently than the IEEE
  31 ;;; standard does.
  32
  33 (def!constant float-sign-shift 31)
  34
  35 (def!constant single-float-bias 126)
  36 (defconstant-eqx single-float-exponent-byte (byte 8 23) #'equalp)
  37 (defconstant-eqx single-float-significand-byte (byte 23 0) #'equalp)
  38 (def!constant single-float-normal-exponent-min 1)
  39 (def!constant single-float-normal-exponent-max 254)
  40 (def!constant single-float-hidden-bit (ash 1 23))
  41 (def!constant single-float-trapping-nan-bit (ash 1 22))
  42
  43 (def!constant double-float-bias 1022)
  44 (defconstant-eqx double-float-exponent-byte (byte 11 20) #'equalp)
  45 (defconstant-eqx double-float-significand-byte (byte 20 0) #'equalp)
  46 (def!constant double-float-normal-exponent-min 1)
  47 (def!constant double-float-normal-exponent-max #x7FE)
  48 (def!constant double-float-hidden-bit (ash 1 20))
  49 (def!constant double-float-trapping-nan-bit (ash 1 19))
  50
  51 (def!constant single-float-digits
  52   (+ (byte-size single-float-significand-byte) 1))
  53
  54 (def!constant double-float-digits
  55   (+ (byte-size double-float-significand-byte) 32 1))
  56
  57
  58 (progn
  59   (def!constant float-invalid-trap-bit (ash 1 0))
  60   (def!constant float-divide-by-zero-trap-bit (ash 1 1))
  61   (def!constant float-overflow-trap-bit (ash 1 2))
  62   (def!constant float-underflow-trap-bit (ash 1 3))
  63   (def!constant float-inexact-trap-bit (ash 1 4))
  64   (def!constant float-input-denormal-trap-bit (ash 1 7))
  65
  66   (def!constant float-round-to-nearest 0)
  67   (def!constant float-round-to-positive 1)
  68   (def!constant float-round-to-negative 2)
  69   (def!constant float-round-to-zero 3)
  70
  71   (defconstant-eqx float-rounding-mode (byte 2 22) #'equalp)
  72
  73   (defconstant-eqx float-sticky-bits (byte 8 0) #'equalp)
  74   (defconstant-eqx float-traps-byte (byte 8 8) #'equalp)
  75   (defconstant-eqx float-exceptions-byte (byte 8 0) #'equalp)
  76
  77   (def!constant float-fast-bit (ash 1 24))) ;; Flush-to-zero mode
  78 \f
  79 ;;;; Where to put the different spaces.
  80
  81 ;;; On non-gencgc we need large dynamic and static spaces for PURIFY
  82 #!-gencgc
  83 (progn
  84   (def!constant read-only-space-start #x04000000)
  85   (def!constant read-only-space-end   #x07ff8000)
  86   (def!constant static-space-start    #x08000000)
  87   (def!constant static-space-end      #x097fff00)
  88
  89   (def!constant linkage-table-space-start #x0a000000)
  90   (def!constant linkage-table-space-end   #x0b000000))
  91
  92 #!+gencgc
  93 (!gencgc-space-setup #x04000000 :dynamic-space-start #x4f000000)
  94
  95 (def!constant linkage-table-entry-size 16)
  96
  97 #!+linux
  98 (progn
  99   #!-gencgc
 100   (progn
 101     (def!constant dynamic-0-space-start #x4f000000)
 102     (def!constant dynamic-0-space-end   #x66fff000)
 103     (def!constant dynamic-1-space-start #x67000000)
 104     (def!constant dynamic-1-space-end   #x7efff000)))
 105 \f
 106 ;;;; other miscellaneous constants
 107
 108 (defenum (:start 8)
 109   halt-trap
 110   pending-interrupt-trap
 111   error-trap
 112   cerror-trap
 113   breakpoint-trap
 114   fun-end-breakpoint-trap
 115   single-step-around-trap
 116   single-step-before-trap
 117   invalid-arg-count-trap)
 118 \f
 119 ;;;; Static symbols.
 120
 121 ;;; These symbols are loaded into static space directly after NIL so
 122 ;;; that the system can compute their address by adding a constant
 123 ;;; amount to NIL.
 124 ;;;
 125 ;;; The fdefn objects for the static functions are loaded into static
 126 ;;; space directly after the static symbols.  That way, the raw-addr
 127 ;;; can be loaded directly out of them by indirecting relative to NIL.
 128 ;;;
 129 (defparameter *static-symbols*
 130   (append
 131    #!-sb-thread
 132    '(*binding-stack-pointer*
 133      *pseudo-atomic-atomic*
 134      *pseudo-atomic-interrupted*)
 135    '(*allocation-pointer*
 136      ;; interrupt handling
 137
 138
 139      ;; Needed for callbacks to work across saving cores. see
 140      ;; ALIEN-CALLBACK-ASSEMBLER-WRAPPER in c-call.lisp for gory
 141      ;; details.
 142      sb!alien::*enter-alien-callback*
 143      #!+gencgc *restart-lisp-function*)
 144    *common-static-symbols*
 145    *c-callable-static-symbols*))
 146
 147 (defparameter *static-funs*
 148   '(two-arg-gcd two-arg-lcm
 149     two-arg-+ two-arg-- two-arg-* two-arg-/
 150     two-arg-< two-arg-> two-arg-=
 151     two-arg-and two-arg-ior two-arg-xor two-arg-eqv
 152
 153     eql
 154     sb!kernel:%negate))
 155
 156 \f
 157 ;;;; Assembler parameters:
 158
 159 ;;; The number of bits per element in the assemblers code vector.
 160 ;;;
 161 (defparameter *assembly-unit-length* 8)
 162
 163 (defvar *allocation-pointer*)