src/compiler/mips/parms.lisp

   1 ;;;; This software is part of the SBCL system. See the README file for
   2 ;;;; more information.
   3 ;;;;
   4 ;;;; This software is derived from the CMU CL system, which was
   5 ;;;; written at Carnegie Mellon University and released into the
   6 ;;;; public domain. The software is in the public domain and is
   7 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
   8 ;;;; files for more information.
   9
  10 (in-package "SB!VM")
  11 \f
  12 ;;;; Machine Architecture parameters:
  13 (eval-when (:compile-toplevel :load-toplevel :execute)
  14
  15 ;;; number of bits per word where a word holds one lisp descriptor
  16 (def!constant n-word-bits 32)
  17
  18 ;;; the natural width of a machine word (as seen in e.g. register width,
  19 ;;; address space)
  20 (def!constant n-machine-word-bits 32)
  21
  22 ;;; number of bits per byte where a byte is the smallest addressable
  23 ;;; object
  24 (def!constant n-byte-bits 8)
  25
  26 (def!constant float-sign-shift 31)
  27
  28 (def!constant single-float-bias 126)
  29 (defconstant-eqx single-float-exponent-byte (byte 8 23) #'equalp)
  30 (defconstant-eqx single-float-significand-byte (byte 23 0) #'equalp)
  31 (def!constant single-float-normal-exponent-min 1)
  32 (def!constant single-float-normal-exponent-max 254)
  33 (def!constant single-float-hidden-bit (ash 1 23))
  34 (def!constant single-float-trapping-nan-bit (ash 1 22))
  35
  36 (def!constant double-float-bias 1022)
  37 (defconstant-eqx double-float-exponent-byte (byte 11 20) #'equalp)
  38 (defconstant-eqx double-float-significand-byte (byte 20 0) #'equalp)
  39 (def!constant double-float-normal-exponent-min 1)
  40 (def!constant double-float-normal-exponent-max #x7FE)
  41 (def!constant double-float-hidden-bit (ash 1 20))
  42 (def!constant double-float-trapping-nan-bit (ash 1 19))
  43
  44 (def!constant single-float-digits
  45   (+ (byte-size single-float-significand-byte) 1))
  46
  47 (def!constant double-float-digits
  48   (+ (byte-size double-float-significand-byte) n-word-bits 1))
  49
  50 (def!constant float-inexact-trap-bit (ash 1 0))
  51 (def!constant float-underflow-trap-bit (ash 1 1))
  52 (def!constant float-overflow-trap-bit (ash 1 2))
  53 (def!constant float-divide-by-zero-trap-bit (ash 1 3))
  54 (def!constant float-invalid-trap-bit (ash 1 4))
  55 (def!constant float-unimplemented-trap-bit (ash 1 5))
  56
  57 (def!constant float-round-to-nearest 0)
  58 (def!constant float-round-to-zero 1)
  59 (def!constant float-round-to-positive 2)
  60 (def!constant float-round-to-negative 3)
  61
  62 (defconstant-eqx float-rounding-mode (byte 2 0) #'equalp)
  63 (defconstant-eqx float-sticky-bits (byte 5 2) #'equalp)
  64 (defconstant-eqx float-traps-byte (byte 5 7) #'equalp)
  65 (defconstant-eqx float-exceptions-byte (byte 6 12) #'equalp)
  66 (defconstant-eqx float-condition-bit (ash 1 23) #'equalp)
  67 (def!constant float-fast-bit (ash 1 24))
  68
  69 ;;;; Description of the target address space.
  70
  71 #!+irix
  72 (progn
  73   ;; Where to put the different spaces.
  74   ;; Old definitions, might be still relevant for an IRIX port.
  75   ;;
  76   (def!constant read-only-space-start #x01000000)
  77   (def!constant read-only-space-end   #x05000000)
  78
  79   (def!constant static-space-start    #x06000000)
  80   (def!constant static-space-end      #x08000000)
  81
  82   (def!constant dynamic-0-space-start #x08000000)
  83   (def!constant dynamic-0-space-end   #x0c000000)
  84   (def!constant dynamic-1-space-start #x0c000000)
  85   (def!constant dynamic-1-space-end   #x10000000))
  86
  87 #!+linux
  88 (progn
  89   ;; Where to put the address spaces on Linux.
  90   ;;
  91   ;; C runtime executable segment starts at 0x00400000
  92   (def!constant read-only-space-start #x01000000)
  93   (def!constant read-only-space-end   #x07ff0000)
  94
  95   (def!constant static-space-start    #x08000000)
  96   (def!constant static-space-end      #x0fff0000)
  97   ;; C runtime read/write segment starts at 0x10000000, heap and DSOs
  98   ;; start at 0x2a000000
  99   (def!constant dynamic-0-space-start #x30000000)
 100   (def!constant dynamic-0-space-end   #x4fff0000)
 101   (def!constant dynamic-1-space-start #x50000000)
 102   (def!constant dynamic-1-space-end   #x6fff0000)
 103
 104   (def!constant linkage-table-space-start #x70000000)
 105   (def!constant linkage-table-space-end   #x71000000)
 106   (def!constant linkage-table-entry-size 16)
 107
 108   ;; C stack grows downward from 0x80000000
 109   )
 110
 111 ); eval-when
 112
 113 \f
 114 ;;;; Other non-type constants.
 115
 116 (defenum ()
 117   atomic-flag
 118   interrupted-flag)
 119
 120 (defenum (:start 8)
 121   halt-trap
 122   pending-interrupt-trap
 123   error-trap
 124   cerror-trap
 125   breakpoint-trap
 126   fun-end-breakpoint-trap
 127   after-breakpoint-trap
 128   unused-trap
 129   pseudo-atomic-trap
 130   object-not-list-trap
 131   object-not-instance-trap
 132   single-step-around-trap
 133   single-step-before-trap)
 134 \f
 135 ;;;; Static symbols.
 136
 137 ;;; Static symbols are loaded into static space directly after NIL so
 138 ;;; that the system can compute their address by adding a constant
 139 ;;; amount to NIL.
 140 ;;;
 141 ;;; The fdefn objects for the static functions are loaded into static
 142 ;;; space directly after the static symbols.  That way, the raw-addr
 143 ;;; can be loaded directly out of them by indirecting relative to NIL.
 144 (defparameter *static-symbols*
 145   (append
 146    *common-static-symbols*
 147    *c-callable-static-symbols*
 148    '()))
 149
 150 (defparameter *static-funs*
 151   '(two-arg-+
 152     two-arg--
 153     two-arg-*
 154     two-arg-/
 155     two-arg-<
 156     two-arg->
 157     two-arg-=
 158     two-arg-<=
 159     two-arg->=
 160     two-arg-/=
 161     eql
 162     %negate
 163     two-arg-and
 164     two-arg-ior
 165     two-arg-xor
 166     length
 167     two-arg-gcd
 168     two-arg-lcm))