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[3d19a6]: src / compiler / sparc / parms.lisp Maximize Restore History

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;;;; 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")
;;;; Machine Architecture parameters:
(eval-when (:compile-toplevel :load-toplevel :execute)
(def!constant n-word-bits 32
#!+sb-doc
"Number of bits per word where a word holds one lisp descriptor.")
;;; the natural width of a machine word (as seen in e.g. register width,
;;; address space)
(def!constant n-machine-word-bits 32)
(def!constant n-byte-bits 8
#!+sb-doc
"Number of bits per byte where a byte is the smallest addressable object.")
(def!constant word-shift (1- (integer-length (/ n-word-bits n-byte-bits)))
#!+sb-doc
"Number of bits to shift between word addresses and byte addresses.")
(def!constant n-word-bytes (/ n-word-bits n-byte-bits)
#!+sb-doc
"Number of bytes in a word.")
(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))
;;; CMUCL COMMENT:
;;; X These values are for the x86 80 bit format and are no doubt
;;; incorrect for the sparc.
;;; FIXME
(def!constant long-float-bias 16382)
(defconstant-eqx long-float-exponent-byte (byte 15 0) #'equalp)
(defconstant-eqx long-float-significand-byte (byte 31 0) #'equalp)
(def!constant long-float-normal-exponent-min 1)
(def!constant long-float-normal-exponent-max #x7FFE)
(def!constant long-float-hidden-bit (ash 1 31))
(def!constant long-float-trapping-nan-bit (ash 1 30))
(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))
;;; This looks wrong - CSR
(def!constant long-float-digits
(+ (byte-size long-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 30) #'equalp) ; RD
(defconstant-eqx float-sticky-bits (byte 5 5) #'equalp) ; aexc
(defconstant-eqx float-traps-byte (byte 5 23) #'equalp) ; TEM
(defconstant-eqx float-exceptions-byte (byte 5 0) #'equalp) ; cexc
;;; According to the SPARC doc (as opposed to FPU doc), the fast mode
;;; bit (EFM) is "reserved", and should always be zero. However, for
;;; sparc-V8 and sparc-V9, it appears to work, causing denormals to
;;; be truncated to 0 silently.
(def!constant float-fast-bit (ash 1 22))
); eval-when
;;; NUMBER-STACK-DISPLACEMENT
;;;
;;; The number of bytes reserved above the number stack pointer. These
;;; slots are required by architecture for a place to spill register windows.
;;;
;;; FIXME: Where is this used?
(def!constant number-stack-displacement
(* 16 n-word-bytes))
;;;; Description of the target address space.
;;; Where to put the different spaces. Must match the C code!
#!+linux
(progn
(def!constant read-only-space-start #x10000000)
(def!constant read-only-space-end #x15000000)
(def!constant static-space-start #x28000000)
(def!constant static-space-end #x2c000000)
;; From alpha/parms.lisp:
;; this is used in PURIFY as part of a sloppy check to see if a pointer
;; is in dynamic space. Chocolate brownie for the first person to fix it
;; -dan 20010502
(def!constant dynamic-space-start #x30000000)
(def!constant dynamic-space-end #x38000000)
(def!constant dynamic-0-space-start #x30000000)
(def!constant dynamic-0-space-end #x38000000)
(def!constant dynamic-1-space-start #x40000000)
(def!constant dynamic-1-space-end #x48000000))
#!+sunos ; might as well start by trying the same numbers
(progn
(def!constant read-only-space-start #x10000000)
(def!constant read-only-space-end #x15000000)
(def!constant static-space-start #x28000000)
(def!constant static-space-end #x2c000000)
(def!constant dynamic-space-start #x30000000)
(def!constant dynamic-space-end #x38000000)
(def!constant dynamic-0-space-start #x30000000)
(def!constant dynamic-0-space-end #x38000000)
(def!constant dynamic-1-space-start #x40000000)
(def!constant dynamic-1-space-end #x48000000))
;;;; other random constants.
(defenum (:suffix -trap :start 8)
halt
pending-interrupt
error
cerror
breakpoint
fun-end-breakpoint
after-breakpoint)
(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*
sb!impl::*!initial-fdefn-objects*
;; functions that the C code needs to call
sub-gc
sb!kernel::internal-error
sb!kernel::control-stack-exhausted-error
sb!di::handle-breakpoint
sb!di::handle-fun-end-breakpoint
;; 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
two-arg-+ two-arg-- two-arg-* two-arg-/ two-arg-< two-arg-> two-arg-=
two-arg-<= two-arg->= two-arg-/= eql %negate
two-arg-and two-arg-ior two-arg-xor two-arg-eqv
two-arg-gcd two-arg-lcm
))
;;;; Assembler parameters:
;;; The number of bits per element in the assemblers code vector.
(defparameter *assembly-unit-length* 8)
;;;; Pseudo-atomic trap number
;;; KLUDGE: Linux on the SPARC doesn't seem to conform to any kind of
;;; standards at all. So we use an explicitly undefined trap, because
;;; that currently does the right thing. Expect this to break
;;; eventually (but with luck, at that point we'll be able to revert
;;; to the compliant trap number...
;;;
;;; KLUDGE: Maybe this should be called pseudo-atomic-magic-number,
;;; allowing other architectures (which don't necessarily use traps
;;; for pseudo-atomic) to propagate a magic number to C land via
;;; sbcl.h.
#!-linux
(def!constant pseudo-atomic-trap #x10)
#!+linux
(def!constant pseudo-atomic-trap #x40)