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;;;; This file contains some parameterizations of various VM
;;;; attributes for the PPC. This file is separate from other stuff so
;;;; that it can be compiled and loaded earlier.
;;;; This software is part of the SBCL system. See the README file for
;;;; more information.
;;;;
;;;; This software is derived from the CMU CL system, which was
;;;; written at Carnegie Mellon University and released into the
;;;; public domain. The software is in the public domain and is
;;;; provided with absolutely no warranty. See the COPYING and CREDITS
;;;; files for more information.
(in-package "SB!VM")
;;; number of bits per word where a word holds one lisp descriptor
(def!constant n-word-bits 32)
;;; the natural width of a machine word (as seen in e.g. register width,
;;; address space)
(def!constant n-machine-word-bits 32)
;;; number of bits per byte where a byte is the smallest addressable
;;; object
(def!constant n-byte-bits 8)
(def!constant float-sign-shift 31)
(def!constant single-float-bias 126)
(defconstant-eqx single-float-exponent-byte (byte 8 23) #'equalp)
(defconstant-eqx single-float-significand-byte (byte 23 0) #'equalp)
(def!constant single-float-normal-exponent-min 1)
(def!constant single-float-normal-exponent-max 254)
(def!constant single-float-hidden-bit (ash 1 23))
(def!constant single-float-trapping-nan-bit (ash 1 22))
(def!constant double-float-bias 1022)
(defconstant-eqx double-float-exponent-byte (byte 11 20) #'equalp)
(defconstant-eqx double-float-significand-byte (byte 20 0) #'equalp)
(def!constant double-float-normal-exponent-min 1)
(def!constant double-float-normal-exponent-max #x7FE)
(def!constant double-float-hidden-bit (ash 1 20))
(def!constant double-float-trapping-nan-bit (ash 1 19))
(def!constant single-float-digits
(+ (byte-size single-float-significand-byte) 1))
(def!constant double-float-digits
(+ (byte-size double-float-significand-byte) n-word-bits 1))
(def!constant float-inexact-trap-bit (ash 1 0))
(def!constant float-divide-by-zero-trap-bit (ash 1 1))
(def!constant float-underflow-trap-bit (ash 1 2))
(def!constant float-overflow-trap-bit (ash 1 3))
(def!constant float-invalid-trap-bit (ash 1 4))
(def!constant float-round-to-nearest 0)
(def!constant float-round-to-zero 1)
(def!constant float-round-to-positive 2)
(def!constant float-round-to-negative 3)
(defconstant-eqx float-rounding-mode (byte 2 0) #'equalp) ; RD
;;; FIXME I: Beware, all ye who trespass here. Despite its name,
;;; FLOAT-STICKY-BITS is not the byte specifier for sticky bits in the
;;; floating point control word. It is more like "accrued exceptions"
;;; where FLOAT-EXCEPTIONS-BYTE is "current exceptions". Consequently,
;;; on architectures where there is no "current exceptions"
;;; FLOAT-EXCEPTIONS-BYTE and FLOAT-STICKY-BITS had better be the
;;; same.
;;;
;;; FIXME II: So, I've now documented this in comments in the PowerPC
;;; tree. This may not make it easy to find for when new architectures
;;; get backends written...
;;;
;;; CSR, 2002-06-11
(defconstant-eqx float-sticky-bits (byte 5 25) #'equalp)
(defconstant-eqx float-traps-byte (byte 5 3) #'equalp)
(defconstant-eqx float-exceptions-byte (byte 5 25) #'equalp) ; cexc
(def!constant float-fast-bit 2) ; Non-IEEE mode
;;; Where to put the different spaces.
(def!constant read-only-space-start #x01000000)
(def!constant read-only-space-end #x04ff8000)
(def!constant static-space-start #x08000000)
(def!constant static-space-end #x097fff00)
;;; FIXME: this is a gross violation of OAOO, done purely to support
;;; the #define of DYNAMIC_SPACE_SIZE in validate.c -- CSR, 2002-02-25
;;; (these numbers should match dynamic-0-*)
(def!constant dynamic-space-start #x40000000)
(def!constant dynamic-space-end #x47fff000)
;;; nothing _seems_ to be using these addresses
(def!constant dynamic-0-space-start #x40000000)
(def!constant dynamic-0-space-end #x47fff000)
(def!constant dynamic-1-space-start #x48000000)
(def!constant dynamic-1-space-end #x4ffff000)
#+darwin
(progn
(def!constant linkage-table-space-start #x50000000)
(def!constant linkage-table-space-end #x51000000)
(def!constant linkage-table-entry-size 16))
;;;; Other random constants.
(defenum (:suffix -trap :start 8)
halt
pending-interrupt
error
cerror
breakpoint
fun-end-breakpoint
after-breakpoint
fixnum-additive-overflow)
(defenum (:prefix object-not- :suffix -trap :start 16)
list
instance)
(defenum (:prefix trace-table-)
normal
call-site
fun-prologue
fun-epilogue)
;;;; Static symbols.
;;; These symbols are loaded into static space directly after NIL so
;;; that the system can compute their address by adding a constant
;;; amount to NIL.
;;;
;;; The fdefn objects for the static functions are loaded into static
;;; space directly after the static symbols. That way, the raw-addr
;;; can be loaded directly out of them by indirecting relative to NIL.
;;;
(defparameter *static-symbols*
'(t
;; The C startup code must fill these in.
*posix-argv*
;; functions that the C code needs to call
sb!impl::sub-gc
sb!kernel::internal-error
sb!kernel::control-stack-exhausted-error
sb!kernel::undefined-alien-error
sb!di::handle-breakpoint
sb!impl::fdefinition-object
;; free pointers
*read-only-space-free-pointer*
*static-space-free-pointer*
*initial-dynamic-space-free-pointer*
;; things needed for non-local exit
*current-catch-block*
*current-unwind-protect-block*
*binding-stack-start*
*control-stack-start*
*control-stack-end*
;; interrupt handling
*free-interrupt-context-index*
sb!unix::*interrupts-enabled*
sb!unix::*interrupt-pending*
))
(defparameter *static-funs*
'(length
sb!kernel:two-arg-+
sb!kernel:two-arg--
sb!kernel:two-arg-*
sb!kernel:two-arg-/
sb!kernel:two-arg-<
sb!kernel:two-arg->
sb!kernel:two-arg-=
sb!kernel:two-arg-<=
sb!kernel:two-arg->=
sb!kernel:two-arg-/=
eql
sb!kernel:%negate
sb!kernel:two-arg-and
sb!kernel:two-arg-ior
sb!kernel:two-arg-xor
sb!kernel:two-arg-eqv
sb!kernel:two-arg-gcd
sb!kernel:two-arg-lcm))
;;;; Assembler parameters:
;;; The number of bits per element in the assemblers code vector.
;;;
(defparameter *assembly-unit-length* 8)