src/compiler/sparc/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 object
  23 (def!constant n-byte-bits 8)
  24
  25 ;;; flags for the generational garbage collector
  26 (def!constant pseudo-atomic-interrupted-flag 1)
  27 (def!constant pseudo-atomic-flag
  28     ;; Must be (ash 1 (1- sb-vm:n-lowtag-bits)) for cheneygc ALLOCATION.
  29     4)
  30
  31 (def!constant float-sign-shift 31)
  32
  33 (def!constant single-float-bias 126)
  34 (defconstant-eqx single-float-exponent-byte (byte 8 23) #'equalp)
  35 (defconstant-eqx single-float-significand-byte (byte 23 0) #'equalp)
  36 (def!constant single-float-normal-exponent-min 1)
  37 (def!constant single-float-normal-exponent-max 254)
  38 (def!constant single-float-hidden-bit (ash 1 23))
  39 (def!constant single-float-trapping-nan-bit (ash 1 22))
  40
  41 (def!constant double-float-bias 1022)
  42 (defconstant-eqx double-float-exponent-byte (byte 11 20) #'equalp)
  43 (defconstant-eqx double-float-significand-byte (byte 20 0) #'equalp)
  44 (def!constant double-float-normal-exponent-min 1)
  45 (def!constant double-float-normal-exponent-max #x7FE)
  46 (def!constant double-float-hidden-bit (ash 1 20))
  47 (def!constant double-float-trapping-nan-bit (ash 1 19))
  48
  49 ;;; CMUCL COMMENT:
  50 ;;;   X These values are for the x86 80 bit format and are no doubt
  51 ;;;   incorrect for the sparc.
  52 ;;; FIXME
  53 (def!constant long-float-bias 16382)
  54 (defconstant-eqx long-float-exponent-byte (byte 15 0) #'equalp)
  55 (defconstant-eqx long-float-significand-byte (byte 31 0) #'equalp)
  56 (def!constant long-float-normal-exponent-min 1)
  57 (def!constant long-float-normal-exponent-max #x7FFE)
  58 (def!constant long-float-hidden-bit (ash 1 31))
  59 (def!constant long-float-trapping-nan-bit (ash 1 30))
  60
  61 (def!constant single-float-digits
  62   (+ (byte-size single-float-significand-byte) 1))
  63
  64 (def!constant double-float-digits
  65   (+ (byte-size double-float-significand-byte) n-word-bits 1))
  66
  67 ;;; This looks wrong - CSR
  68 (def!constant long-float-digits
  69   (+ (byte-size long-float-significand-byte) n-word-bits 1))
  70
  71 (def!constant float-inexact-trap-bit (ash 1 0))
  72 (def!constant float-divide-by-zero-trap-bit (ash 1 1))
  73 (def!constant float-underflow-trap-bit (ash 1 2))
  74 (def!constant float-overflow-trap-bit (ash 1 3))
  75 (def!constant float-invalid-trap-bit (ash 1 4))
  76
  77 (def!constant float-round-to-nearest 0)
  78 (def!constant float-round-to-zero 1)
  79 (def!constant float-round-to-positive 2)
  80 (def!constant float-round-to-negative 3)
  81
  82 (defconstant-eqx float-rounding-mode (byte 2 30) #'equalp)        ; RD
  83 (defconstant-eqx float-sticky-bits (byte 5 5) #'equalp)   ; aexc
  84 (defconstant-eqx float-traps-byte (byte 5 23) #'equalp)   ; TEM
  85 (defconstant-eqx float-exceptions-byte (byte 5 0) #'equalp)       ; cexc
  86
  87 ;;; According to the SPARC doc (as opposed to FPU doc), the fast mode
  88 ;;; bit (EFM) is "reserved", and should always be zero.  However, for
  89 ;;; sparc-V8 and sparc-V9, it appears to work, causing denormals to
  90 ;;; be truncated to 0 silently.
  91 (def!constant float-fast-bit (ash 1 22))
  92
  93 ); eval-when
  94
  95 \f
  96 ;;;; Description of the target address space.
  97
  98 ;;; Where to put the different spaces.  Must match the C code!
  99 #!+(and linux cheneygc)
 100 (progn
 101   (def!constant linkage-table-space-start #x0f800000)
 102   (def!constant linkage-table-space-end   #x10000000)
 103
 104   (def!constant read-only-space-start     #x11000000)
 105   (def!constant read-only-space-end       #x15000000)
 106
 107   (def!constant static-space-start        #x28000000)
 108   (def!constant static-space-end          #x2c000000)
 109
 110   (def!constant dynamic-0-space-start #x30000000)
 111   (def!constant dynamic-0-space-end   #x38000000)
 112
 113   (def!constant dynamic-1-space-start #x40000000)
 114   (def!constant dynamic-1-space-end   #x48000000))
 115
 116 #!+(and linux gencgc) ; sensibly small read-only and static spaces
 117 (progn
 118   (def!constant linkage-table-space-start #x0f800000)
 119   (def!constant linkage-table-space-end   #x10000000)
 120
 121   (def!constant read-only-space-start     #x11000000)
 122   (def!constant read-only-space-end       #x110ff000)
 123
 124   (def!constant static-space-start        #x11100000)
 125   (def!constant static-space-end          #x111ff000)
 126
 127   (def!constant dynamic-space-start       #x30000000)
 128   (def!constant dynamic-space-end         (!configure-dynamic-space-end)))
 129
 130 #!+(and sunos cheneygc) ; might as well start by trying the same numbers
 131 (progn
 132   (def!constant linkage-table-space-start #x0f800000)
 133   (def!constant linkage-table-space-end   #x10000000)
 134
 135   (def!constant read-only-space-start     #x11000000)
 136   (def!constant read-only-space-end       #x15000000)
 137
 138   (def!constant static-space-start        #x28000000)
 139   (def!constant static-space-end          #x2c000000)
 140
 141   (def!constant dynamic-0-space-start     #x30000000)
 142   (def!constant dynamic-0-space-end       #x38000000)
 143
 144   (def!constant dynamic-1-space-start     #x40000000)
 145   (def!constant dynamic-1-space-end       #x48000000))
 146
 147 #!+(and sunos gencgc) ; sensibly small read-only and static spaces
 148 (progn
 149   (def!constant linkage-table-space-start #x0f800000)
 150   (def!constant linkage-table-space-end   #x10000000)
 151
 152   (def!constant read-only-space-start     #x11000000)
 153   (def!constant read-only-space-end       #x110ff000)
 154
 155   (def!constant static-space-start        #x11100000)
 156   (def!constant static-space-end          #x111ff000)
 157
 158   (def!constant dynamic-space-start       #x30000000)
 159   (def!constant dynamic-space-end         (!configure-dynamic-space-end)))
 160
 161 #!+netbsd ; Need a gap at 0x4000000 for shared libraries
 162 (progn
 163   (def!constant linkage-table-space-start #x0f800000)
 164   (def!constant linkage-table-space-end   #x10000000)
 165
 166   (def!constant read-only-space-start     #x11000000)
 167   (def!constant read-only-space-end       #x15000000)
 168
 169   (def!constant static-space-start        #x18000000)
 170   (def!constant static-space-end          #x1c000000)
 171
 172   (def!constant dynamic-0-space-start     #x48000000)
 173   (def!constant dynamic-0-space-end       #x5ffff000)
 174
 175   (def!constant dynamic-1-space-start     #x60000000)
 176   (def!constant dynamic-1-space-end       #x77fff000))
 177
 178 ;; Size of one linkage-table entry in bytes. See comment in
 179 ;; src/runtime/sparc-arch.c
 180 (def!constant linkage-table-entry-size 16)
 181
 182 \f
 183 ;;;; other random constants.
 184
 185 (defenum (:start 8)
 186   halt-trap
 187   pending-interrupt-trap
 188   error-trap
 189   cerror-trap
 190   breakpoint-trap
 191   fun-end-breakpoint-trap
 192   after-breakpoint-trap
 193   single-step-around-trap
 194   single-step-before-trap
 195   #!+gencgc allocation-trap)
 196
 197 (defenum (:start 24)
 198   object-not-list-trap
 199   object-not-instance-trap)
 200 \f
 201 ;;;; static symbols.
 202
 203 ;;; These symbols are loaded into static space directly after NIL so
 204 ;;; that the system can compute their address by adding a constant
 205 ;;; amount to NIL.
 206 ;;;
 207 ;;; The fdefn objects for the static functions are loaded into static
 208 ;;; space directly after the static symbols.  That way, the raw-addr
 209 ;;; can be loaded directly out of them by indirecting relative to NIL.
 210 ;;;
 211 (defparameter *static-symbols*
 212   (append
 213    *common-static-symbols*
 214    *c-callable-static-symbols*
 215    '(#!+gencgc *restart-lisp-function*)))
 216
 217 (defparameter *static-funs*
 218   '(length
 219     two-arg-+ two-arg-- two-arg-* two-arg-/ two-arg-< two-arg-> two-arg-=
 220     two-arg-<= two-arg->= two-arg-/= eql %negate
 221     two-arg-and two-arg-ior two-arg-xor two-arg-eqv
 222     two-arg-gcd two-arg-lcm))
 223 \f
 224 ;;;; Pseudo-atomic trap number
 225
 226 ;;; KLUDGE: Linux on the SPARC doesn't seem to conform to any kind of
 227 ;;; standards at all. So we use an explicitly undefined trap, because
 228 ;;; that currently does the right thing. Expect this to break
 229 ;;; eventually (but with luck, at that point we'll be able to revert
 230 ;;; to the compliant trap number...
 231 ;;;
 232 ;;; KLUDGE: Maybe this should be called pseudo-atomic-magic-number,
 233 ;;; allowing other architectures (which don't necessarily use traps
 234 ;;; for pseudo-atomic) to propagate a magic number to C land via
 235 ;;; sbcl.h.
 236 #!-linux
 237 (def!constant pseudo-atomic-trap #x10)
 238 #!+linux
 239 (def!constant pseudo-atomic-trap #x40)