src/compiler/arm/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 32)
  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 32)
  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) n-word-bits 1))
  56
  57 #!+arm-vfp
  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-zero 1)
  68   (def!constant float-round-to-positive 2)
  69   (def!constant float-round-to-negative 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 ;; NOTE: As with the FLOAT-REGISTERS SB in vm.lisp, if you define this
  79 ;; for non-VFP systems, please use a specific positive feature
  80 ;; conditional.
  81 #!-arm-vfp
  82 (error "Don't know how to set the FPU control word layout on non-VFP systems")
  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   (def!constant read-only-space-start #x04000000)
  90   (def!constant read-only-space-end   #x07ff8000)
  91   (def!constant static-space-start    #x08000000)
  92   (def!constant static-space-end      #x097fff00)
  93
  94   (def!constant linkage-table-space-start #x0a000000)
  95   (def!constant linkage-table-space-end   #x0b000000))
  96
  97 (def!constant linkage-table-entry-size 16)
  98
  99 #!+linux
 100 (progn
 101   #!-gencgc
 102   (progn
 103     (def!constant dynamic-0-space-start #x4f000000)
 104     (def!constant dynamic-0-space-end   #x66fff000)
 105     (def!constant dynamic-1-space-start #x67000000)
 106     (def!constant dynamic-1-space-end   #x7efff000)))
 107 \f
 108 ;;;; other miscellaneous constants
 109
 110 (defenum (:start 8)
 111   halt-trap
 112   pending-interrupt-trap
 113   error-trap
 114   cerror-trap
 115   breakpoint-trap
 116   fun-end-breakpoint-trap
 117   single-step-around-trap
 118   single-step-before-trap)
 119 \f
 120 ;;;; Static symbols.
 121
 122 ;;; These symbols are loaded into static space directly after NIL so
 123 ;;; that the system can compute their address by adding a constant
 124 ;;; amount to NIL.
 125 ;;;
 126 ;;; The fdefn objects for the static functions are loaded into static
 127 ;;; space directly after the static symbols.  That way, the raw-addr
 128 ;;; can be loaded directly out of them by indirecting relative to NIL.
 129 ;;;
 130 (defparameter *static-symbols*
 131   (append
 132    *common-static-symbols*
 133    *c-callable-static-symbols*
 134    '(*allocation-pointer*
 135
 136      *binding-stack-pointer*
 137      *number-stack-pointer*
 138
 139      ;; interrupt handling
 140      *pseudo-atomic-atomic*
 141      *pseudo-atomic-interrupted*)))
 142
 143 (defparameter *static-funs*
 144   '(two-arg-gcd two-arg-lcm
 145     two-arg-+ two-arg-- two-arg-* two-arg-/
 146     two-arg-< two-arg-> two-arg-=
 147     two-arg-and two-arg-ior two-arg-xor two-arg-eqv))
 148
 149 \f
 150 ;;;; Assembler parameters:
 151
 152 ;;; The number of bits per element in the assemblers code vector.
 153 ;;;
 154 (defparameter *assembly-unit-length* 8)