src/compiler/x86-64/parms.lisp

   1 ;;;; This file contains some parameterizations of various VM
   2 ;;;; attributes for the x86. 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 ;;; ### Note: we simultaneously use ``word'' to mean a 32 bit quantity
  17 ;;; and a 16 bit quantity depending on context. This is because Intel
  18 ;;; insists on calling 16 bit things words and 32 bit things
  19 ;;; double-words (or dwords). Therefore, in the instruction definition
  20 ;;; and register specs, we use the Intel convention. But whenever we
  21 ;;; are talking about stuff the rest of the lisp system might be
  22 ;;; interested in, we use ``word'' to mean the size of a descriptor
  23 ;;; object, which is 32 bits.
  24 \f
  25 ;;;; machine architecture parameters
  26
  27 ;;; the number of bits per word, where a word holds one lisp descriptor
  28 (def!constant n-word-bits 64)
  29
  30 ;;; the natural width of a machine word (as seen in e.g. register width,
  31 ;;; address space)
  32 (def!constant n-machine-word-bits 64)
  33
  34 ;;; the number of bits per byte, where a byte is the smallest
  35 ;;; addressable object
  36 (def!constant n-byte-bits 8)
  37
  38 (def!constant float-sign-shift 31)
  39
  40 ;;; comment from CMU CL:
  41 ;;;   These values were taken from the alpha code. The values for
  42 ;;;   bias and exponent min/max are not the same as shown in the 486 book.
  43 ;;;   They may be correct for how Python uses them.
  44 (def!constant single-float-bias 126)    ; Intel says 127.
  45 (defconstant-eqx single-float-exponent-byte    (byte 8 23) #'equalp)
  46 (defconstant-eqx single-float-significand-byte (byte 23 0) #'equalp)
  47 ;;; comment from CMU CL:
  48 ;;;   The 486 book shows the exponent range -126 to +127. The Lisp
  49 ;;;   code that uses these values seems to want already biased numbers.
  50 (def!constant single-float-normal-exponent-min 1)
  51 (def!constant single-float-normal-exponent-max 254)
  52 (def!constant single-float-hidden-bit (ash 1 23))
  53 (def!constant single-float-trapping-nan-bit (ash 1 22))
  54
  55 (def!constant double-float-bias 1022)
  56 (defconstant-eqx double-float-exponent-byte    (byte 11 20) #'equalp)
  57 (defconstant-eqx double-float-significand-byte (byte 20 0)  #'equalp)
  58 (def!constant double-float-normal-exponent-min 1)
  59 (def!constant double-float-normal-exponent-max #x7FE)
  60 (def!constant double-float-hidden-bit (ash 1 20))
  61 (def!constant double-float-trapping-nan-bit (ash 1 19))
  62
  63 (def!constant single-float-digits
  64   (+ (byte-size single-float-significand-byte) 1))
  65
  66 (def!constant double-float-digits
  67   (+ (byte-size double-float-significand-byte) 32 1))
  68
  69 ;;; from AMD64 Architecture manual
  70 (def!constant float-invalid-trap-bit       (ash 1 0))
  71 (def!constant float-denormal-trap-bit       (ash 1 1))
  72 (def!constant float-divide-by-zero-trap-bit (ash 1 2))
  73 (def!constant float-overflow-trap-bit       (ash 1 3))
  74 (def!constant float-underflow-trap-bit      (ash 1 4))
  75 (def!constant float-inexact-trap-bit       (ash 1 5))
  76
  77 (def!constant float-round-to-nearest  0)
  78 (def!constant float-round-to-negative 1)
  79 (def!constant float-round-to-positive 2)
  80 (def!constant float-round-to-zero     3)
  81
  82 (defconstant-eqx float-rounding-mode     (byte 2 13) #'equalp)
  83 (defconstant-eqx float-sticky-bits       (byte 6  0) #'equalp)
  84 (defconstant-eqx float-traps-byte        (byte 6  7) #'equalp)
  85 (defconstant-eqx float-exceptions-byte   (byte 6  0) #'equalp)
  86 (def!constant float-fast-bit 0) ; no fast mode on x86-64
  87 \f
  88 ;;;; description of the target address space
  89
  90 ;;; where to put the different spaces.
  91
  92 ;;; Currently the read-only and static spaces must be located in low
  93 ;;; memory (certainly under the 4GB limit, very probably under 2GB
  94 ;;; limit). This is due to the inability of using immediate values of
  95 ;;; more than 32 bits (31 bits if you take sign extension into
  96 ;;; account) in any other instructions except MOV. Removing this limit
  97 ;;; would be possible, but probably not worth the time and code bloat
  98 ;;; it would cause. -- JES, 2005-12-11
  99
 100 (def!constant read-only-space-start     #x20000000)
 101 (def!constant read-only-space-end       #x27ff0000)
 102
 103 (def!constant static-space-start        #x40000000)
 104 (def!constant static-space-end          #x47fff000)
 105
 106 (def!constant dynamic-space-start   #x1000000000)
 107 (def!constant dynamic-space-end     #x11ffff0000)
 108
 109 (def!constant linkage-table-space-start #x60000000)
 110 (def!constant linkage-table-space-end   #x63fff000)
 111
 112 (def!constant linkage-table-entry-size 16)
 113 \f
 114 ;;;; other miscellaneous constants
 115
 116 (defenum (:suffix -trap :start 8)
 117   halt
 118   pending-interrupt
 119   error
 120   cerror
 121   breakpoint
 122   fun-end-breakpoint
 123   single-step-around
 124   single-step-before)
 125 ;;; FIXME: It'd be nice to replace all the DEFENUMs with something like
 126 ;;;   (WITH-DEF-ENUM (:START 8)
 127 ;;;     (DEF-ENUM HALT-TRAP)
 128 ;;;     (DEF-ENUM PENDING-INTERRUPT-TRAP)
 129 ;;;     ..)
 130 ;;; for the benefit of anyone doing a lexical search for definitions
 131 ;;; of these symbols.
 132
 133 (defenum (:prefix object-not- :suffix -trap :start 24)
 134   list
 135   instance)
 136
 137 (defenum (:prefix trace-table-)
 138   normal
 139   call-site
 140   fun-prologue
 141   fun-epilogue)
 142 \f
 143 ;;;; static symbols
 144
 145 ;;; These symbols are loaded into static space directly after NIL so
 146 ;;; that the system can compute their address by adding a constant
 147 ;;; amount to NIL.
 148 ;;;
 149 ;;; The fdefn objects for the static functions are loaded into static
 150 ;;; space directly after the static symbols. That way, the raw-addr
 151 ;;; can be loaded directly out of them by indirecting relative to NIL.
 152 ;;;
 153 ;;; we could profitably keep these in registers on x86-64 now we have
 154 ;;; r8-r15 as well
 155 ;;;     Note these spaces grow from low to high addresses.
 156 (defvar *allocation-pointer*)
 157 (defvar *binding-stack-pointer*)
 158
 159 (defparameter *static-symbols*
 160   (append
 161    *common-static-symbols*
 162    *c-callable-static-symbols*
 163    '(*alien-stack*
 164
 165      ;; interrupt handling
 166      *pseudo-atomic-bits*
 167
 168      #!+sb-thread *stop-for-gc-pending*
 169
 170      #!+sb-thread *free-tls-index*
 171      #!+sb-thread *tls-index-lock*
 172
 173      *allocation-pointer*
 174      *binding-stack-pointer*
 175
 176      ;; the floating point constants
 177      *fp-constant-0d0*
 178      *fp-constant-1d0*
 179      *fp-constant-0f0*
 180      *fp-constant-1f0*
 181
 182      ;; For GC-AND-SAVE
 183      *restart-lisp-function*
 184
 185      ;; Needed for callbacks to work across saving cores. see
 186      ;; ALIEN-CALLBACK-ASSEMBLER-WRAPPER in c-call.lisp for gory
 187      ;; details.
 188      sb!alien::*enter-alien-callback*
 189
 190      ;; The ..SLOT-UNBOUND.. symbol is static in order to optimise the
 191      ;; common slot unbound check.
 192      ;;
 193      ;; FIXME: In SBCL, the CLOS code has become sufficiently tightly
 194      ;; integrated into the system that it'd probably make sense to
 195      ;; use the ordinary unbound marker for this.
 196      ;;
 197      ;; FIXME II: if it doesn't make sense, why is this X86-ish only?
 198      sb!pcl::..slot-unbound..)))
 199
 200 (defparameter *static-funs*
 201   '(length
 202     sb!kernel:two-arg-+
 203     sb!kernel:two-arg--
 204     sb!kernel:two-arg-*
 205     sb!kernel:two-arg-/
 206     sb!kernel:two-arg-<
 207     sb!kernel:two-arg->
 208     sb!kernel:two-arg-=
 209     eql
 210     sb!kernel:%negate
 211     sb!kernel:two-arg-and
 212     sb!kernel:two-arg-ior
 213     sb!kernel:two-arg-xor
 214     sb!kernel:two-arg-gcd
 215     sb!kernel:two-arg-lcm))