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 (def!constant read-only-space-start     #x20000000)
  93 (def!constant read-only-space-end       #x27ff0000)
  94
  95 (def!constant static-space-start        #x40000000)
  96 (def!constant static-space-end          #x47fff000)
  97
  98 (def!constant dynamic-space-start   #x1000000000)
  99 (def!constant dynamic-space-end     #x11ffff0000)
 100
 101 (def!constant linkage-table-space-start #x60000000)
 102 (def!constant linkage-table-space-end   #x63fff000)
 103
 104 (def!constant linkage-table-entry-size 16)
 105 \f
 106 ;;;; other miscellaneous constants
 107
 108 (defenum (:suffix -trap :start 8)
 109   halt
 110   pending-interrupt
 111   error
 112   cerror
 113   breakpoint
 114   fun-end-breakpoint
 115   single-step-breakpoint)
 116 ;;; FIXME: It'd be nice to replace all the DEFENUMs with something like
 117 ;;;   (WITH-DEF-ENUM (:START 8)
 118 ;;;     (DEF-ENUM HALT-TRAP)
 119 ;;;     (DEF-ENUM PENDING-INTERRUPT-TRAP)
 120 ;;;     ..)
 121 ;;; for the benefit of anyone doing a lexical search for definitions
 122 ;;; of these symbols.
 123
 124 (defenum (:prefix object-not- :suffix -trap :start 16)
 125   list
 126   instance)
 127
 128 (defenum (:prefix trace-table-)
 129   normal
 130   call-site
 131   fun-prologue
 132   fun-epilogue)
 133 \f
 134 ;;;; static symbols
 135
 136 ;;; These symbols are loaded into static space directly after NIL so
 137 ;;; that the system can compute their address by adding a constant
 138 ;;; amount to NIL.
 139 ;;;
 140 ;;; The fdefn objects for the static functions are loaded into static
 141 ;;; space directly after the static symbols. That way, the raw-addr
 142 ;;; can be loaded directly out of them by indirecting relative to NIL.
 143 ;;;
 144 ;;; we could profitably keep these in registers on x86-64 now we have
 145 ;;; r8-r15 as well
 146 ;;;     Note these spaces grow from low to high addresses.
 147 (defvar *allocation-pointer*)
 148 (defvar *binding-stack-pointer*)
 149
 150 ;;; FIXME: !COLD-INIT probably doesn't need
 151 ;;; to be in the static symbols table any more.
 152 ;;;
 153 ;;; FIXME: some of these symbols are shared by all backends,
 154 ;;; and should be factored out into a common file.
 155 (defparameter *static-symbols*
 156   '(t
 157
 158     ;; The C startup code must fill these in.
 159     *posix-argv*
 160
 161     ;; functions that the C code needs to call.  When adding to this list,
 162     ;; also add a `frob' form in genesis.lisp finish-symbols.
 163     sub-gc
 164     sb!kernel::internal-error
 165     sb!kernel::control-stack-exhausted-error
 166     sb!kernel::undefined-alien-variable-error
 167     sb!kernel::undefined-alien-function-error
 168     sb!kernel::memory-fault-error
 169     sb!di::handle-breakpoint
 170     fdefinition-object
 171
 172     ;; free pointers
 173     ;;
 174     ;; Note that these are FIXNUM word counts, not (as one might
 175     ;; expect) byte counts or SAPs. The reason seems to be that by
 176     ;; representing them this way, we can avoid consing bignums.
 177     ;; -- WHN 2000-10-02
 178     *read-only-space-free-pointer*
 179     *static-space-free-pointer*
 180     *initial-dynamic-space-free-pointer*
 181
 182     ;; things needed for non-local exit
 183     *current-catch-block*
 184     *current-unwind-protect-block*
 185     *alien-stack*
 186
 187     ;; interrupt handling
 188     *pseudo-atomic-atomic*
 189     *pseudo-atomic-interrupted*
 190     sb!unix::*interrupts-enabled*
 191     sb!unix::*interrupt-pending*
 192     *free-interrupt-context-index*
 193     *gc-inhibit*
 194     #!+sb-thread *stop-for-gc-pending*
 195     *gc-pending*
 196
 197     *free-tls-index*
 198
 199     *allocation-pointer*
 200     *binding-stack-pointer*
 201     *binding-stack-start*
 202     *control-stack-start*
 203     *control-stack-end*
 204
 205     ;; the floating point constants
 206     *fp-constant-0d0*
 207     *fp-constant-1d0*
 208     *fp-constant-0f0*
 209     *fp-constant-1f0*
 210
 211     ;; The ..SLOT-UNBOUND.. symbol is static in order to optimise the
 212     ;; common slot unbound check.
 213     ;;
 214     ;; FIXME: In SBCL, the CLOS code has become sufficiently tightly
 215     ;; integrated into the system that it'd probably make sense to use
 216     ;; the ordinary unbound marker for this.
 217     sb!pcl::..slot-unbound..))
 218
 219 (defparameter *static-funs*
 220   '(length
 221     sb!kernel:two-arg-+
 222     sb!kernel:two-arg--
 223     sb!kernel:two-arg-*
 224     sb!kernel:two-arg-/
 225     sb!kernel:two-arg-<
 226     sb!kernel:two-arg->
 227     sb!kernel:two-arg-=
 228     eql
 229     sb!kernel:%negate
 230     sb!kernel:two-arg-and
 231     sb!kernel:two-arg-ior
 232     sb!kernel:two-arg-xor
 233     sb!kernel:two-arg-gcd
 234     sb!kernel:two-arg-lcm))