+;;;; 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")
(eval-when (:compile-toplevel :load-toplevel :execute)
-(defconstant word-bits 32
- #!+sb-doc
- "Number of bits per word where a word holds one lisp descriptor.")
+;;; number of bits per word where a word holds one lisp descriptor
+(def!constant n-word-bits 32)
-(defconstant byte-bits 8
- #!+sb-doc
- "Number of bits per byte where a byte is the smallest addressable object.")
+;;; the natural width of a machine word (as seen in e.g. register width,
+;;; address space)
+(def!constant n-machine-word-bits 64)
-(defconstant word-shift (1- (integer-length (/ word-bits byte-bits)))
- #!+sb-doc
- "Number of bits to shift between word addresses and byte addresses.")
+;;; number of bits per byte where a byte is the smallest addressable
+;;; object
+(def!constant n-byte-bits 8)
-(defconstant word-bytes (/ word-bits byte-bits)
- #!+sb-doc
- "Number of bytes in a word.")
+(def!constant float-sign-shift 31)
-(defconstant float-sign-shift 31)
-
-(defconstant single-float-bias 126)
+(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)
-(defconstant single-float-normal-exponent-min 1)
-(defconstant single-float-normal-exponent-max 254)
-(defconstant single-float-hidden-bit (ash 1 23))
-(defconstant single-float-trapping-nan-bit (ash 1 22))
+(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))
-(defconstant double-float-bias 1022)
+(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)
-(defconstant double-float-normal-exponent-min 1)
-(defconstant double-float-normal-exponent-max #x7FE)
-(defconstant double-float-hidden-bit (ash 1 20))
-(defconstant double-float-trapping-nan-bit (ash 1 19))
+(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))
-(defconstant single-float-digits
+(def!constant single-float-digits
(+ (byte-size single-float-significand-byte) 1))
-(defconstant double-float-digits
- (+ (byte-size double-float-significand-byte) word-bits 1))
-
-;; Values in 17f code seem to be same as HPPA. These values are from
-;; DEC Assembly Language Programmers guide. The active bits are
-;; actually in (byte 12 52) of the fpcr. (byte 6 52) contain the
-;; exception flags. Bit 63 is the bitwise logor of all exceptions.
-;; The enable and exception bytes are in a software control word
-;; manipulated via OS functions and the bits in the SCP match those
-;; defs. This mapping follows <machine/fpu.h>
-(defconstant float-inexact-trap-bit (ash 1 4)) ; rw
-(defconstant float-underflow-trap-bit (ash 1 3)) ; rw
-(defconstant float-overflow-trap-bit (ash 1 2)) ; ro
-(defconstant float-divide-by-zero-trap-bit (ash 1 1)) ; ro
-(defconstant float-invalid-trap-bit (ash 1 0)) ; ro
-
-(defconstant float-round-to-zero 0)
-(defconstant float-round-to-negative 1)
-(defconstant float-round-to-nearest 2)
-(defconstant float-round-to-positive 3)
-
-;; These aren't quite correct yet. Work in progress.
-(defconstant-eqx float-rounding-mode (byte 2 58) #'equalp) ; hardware fpcr
-(defconstant-eqx float-exceptions-byte (byte 6 52) #'equalp) ; hardware fpcr
-(defconstant-eqx float-sticky-bits (byte 6 17) #'equalp) ; software (clear only)
-(defconstant-eqx float-traps-byte (byte 6 1) #'equalp) ; software fp control word
-(defconstant float-condition-bit (ash 1 63)) ; summary - not used?? XXX
-(defconstant float-fast-bit 0)
+(def!constant double-float-digits
+ (+ (byte-size double-float-significand-byte) n-word-bits 1))
+
+;;; These values are originally from the DEC Assembly Language
+;;; Programmers guide. Where possible we read/write the software
+;;; fp_control word, which apparently is necessary for the OS FPU
+;;; completion (OS handler which fixes up non-IEEE answers that the
+;;; hardware occasionally gives us) to work properly. The rounding
+;;; mode, however, can't be set that way, so we have to deal with that
+;;; directly. (FIXME: we actually don't suport setting the rounding mode
+;;; at the moment anyway)
+
+;;; Short guide to floating point trap terminology: an "exception" is
+;;; cheap and can happen at almost any time. An exception will only
+;;; generate a trap if that trap is enabled, otherwise a default value
+;;; will be substituted. A "trap" will end up somewhere in the
+;;; kernel, which may play by its own rules, (on Alpha it allegedly
+;;; actually fixes up some non-IEEE compliant results to get the
+;;; _right_ answer) but if something is really wrong will eventually
+;;; signal SIGFPE and let us sort it out.
+
+;;; Old comment follows: The active bits are actually in (byte 12 52)
+;;; of the fpcr. (byte 6 52) contain the exception flags. Bit 63 is the
+;;; bitwise logor of all exceptions. The enable and exception bytes
+;;; are in a software control word manipulated via OS functions and the
+;;; bits in the SCP match those defs. This mapping follows
+;;; <machine/fpu.h>
+
+;;; trap enables are set in software (fp_control)
+(def!constant float-inexact-trap-bit (ash 1 4)) ; rw
+(def!constant float-underflow-trap-bit (ash 1 3)) ; rw
+(def!constant float-overflow-trap-bit (ash 1 2)) ; ro
+(def!constant float-divide-by-zero-trap-bit (ash 1 1)) ; ro
+(def!constant float-invalid-trap-bit (ash 1 0)) ; ro
+(defconstant-eqx float-traps-byte (byte 6 1) #'equalp)
+
+;;; exceptions are also read/written in software (by syscalls, no less).
+;;; This is kind of dumb, but has to be done
+(defconstant-eqx float-sticky-bits (byte 6 17) #'equalp) ; fp_control
+
+;;; (We don't actually _have_ "current exceptions" on Alpha; the
+;;; hardware only ever sets bits. So, set this the same as accrued
+;;; exceptions)
+(defconstant-eqx float-exceptions-byte (byte 6 17) #'equalp)
+
+;;; Rounding modes can only be set by frobbing the hardware fpcr directly
+(def!constant float-round-to-zero 0)
+(def!constant float-round-to-negative 1)
+(def!constant float-round-to-nearest 2)
+(def!constant float-round-to-positive 3)
+(defconstant-eqx float-rounding-mode (byte 2 58) #'equalp)
+
+;;; Miscellaneous stuff - I think it's far to say that you deserve
+;;; what you get if you ask for fast mode.
+(def!constant float-fast-bit 0)
); eval-when
#!+linux
(progn
- (defconstant read-only-space-start #x20000000)
- (defconstant read-only-space-end #x24000000)
-
- (defconstant static-space-start #x28000000)
- (defconstant static-space-end #x2c000000)
-
- ;; 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
- (defconstant dynamic-space-start #x30000000)
- (defconstant dynamic-space-end #x38000000)
+ (def!constant read-only-space-start #x20000000)
+ (def!constant read-only-space-end #x24000000))
- (defconstant dynamic-0-space-start #x30000000)
- (defconstant dynamic-0-space-end #x38000000)
-
- (defconstant dynamic-1-space-start #x40000000)
- (defconstant dynamic-1-space-end #x48000000)
+#!+osf1
+(progn
+ (defconstant read-only-space-start #x10000000)
+ (defconstant read-only-space-end #x25000000))
- (defconstant control-stack-start #x50000000)
- (defconstant control-stack-end #x51000000)
- (defconstant binding-stack-start #x70000000)
- (defconstant binding-stack-end #x71000000))
+(def!constant static-space-start #x28000000)
+(def!constant static-space-end #x2c000000)
-#!+osf1 ;as if
-(progn
- (defparameter read-only-space-start #x10000000)
- (defparameter static-space-start #x28000000)
- (defparameter dynamic-space-start #x30000000))
+(def!constant dynamic-0-space-start #x30000000)
+(def!constant dynamic-0-space-end #x3fff0000)
+(def!constant dynamic-1-space-start #x40000000)
+(def!constant dynamic-1-space-end #x4fff0000)
;;; FIXME nothing refers to either of these in alpha or x86 cmucl
;;; backend, so they could probably be removed.
;; The space-register holding the lisp heap.
-(defconstant lisp-heap-space 4)
+(def!constant lisp-heap-space 4)
;; The space-register holding the C text segment.
-(defconstant c-text-space 4)
+(def!constant c-text-space 4)
;;; the X86 port defines *nil-value* as (+ *target-static-space-start* #xB)
;;; here, but it seems to be the only port that needs to know the
;;; location of NIL from lisp.
-
-
\f
-;;;; Other random constants.
-
-(defenum (:suffix -trap :start 8)
- halt
- pending-interrupt
- error
- cerror
- breakpoint
- function-end-breakpoint
- single-step-breakpoint)
-
-(defenum (:prefix trace-table-)
- normal
- call-site
- function-prologue
- function-epilogue)
-
-
+;;;; other miscellaneous constants
+
+(defenum (:start 8)
+ halt-trap
+ pending-interrupt-trap
+ error-trap
+ cerror-trap
+ breakpoint-trap
+ fun-end-breakpoint-trap
+ single-step-breakpoint-trap
+ ;; Stepper actually not implemented on Alpha, but these constants
+ ;; are still needed to avoid undefined variable warnings during sbcl
+ ;; build.
+ single-step-around-trap
+ single-step-before-trap)
\f
-;;;; Static symbols.
+;;;; static symbols
;;; These symbols are loaded into static space directly after NIL so
;;; that the system can compute their address by adding a constant
;;; 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*
- ;;lisp::lisp-environment-list
- ;;lisp::lisp-command-line-list
- sb!impl::*!initial-fdefn-objects*
-
- ;; Functions that the C code needs to call
- sb!impl::%initial-function
- sb!impl::maybe-gc
- sb!kernel::internal-error
- sb!di::handle-breakpoint
- sb!di::handle-function-end-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.
- sb!impl::*current-catch-block*
- sb!impl::*current-unwind-protect-block*
- sb!c::*eval-stack-top*
-
- ;; Interrupt Handling
- sb!impl::*free-interrupt-context-index*
- sb!unix::*interrupts-enabled*
- sb!unix::*interrupt-pending*
- ))
-
-(defparameter *static-functions*
+ (append
+ *common-static-symbols*
+ *c-callable-static-symbols*
+ '()))
+
+(defparameter *static-funs*
'(length
sb!kernel:two-arg-+
sb!kernel:two-arg--
sb!kernel:two-arg-<
sb!kernel:two-arg->
sb!kernel:two-arg-=
- ;; Probably need the following as they are defined in arith.lisp
- ;; two-arg-<= two-arg->= two-arg-/=
+ ;; FIXME: Is this
+ ;; probably need the following as they are defined in
+ ;; arith.lisp: two-arg-<= two-arg->= two-arg-/=
+ ;; a comment from old CMU CL or old old CMU CL or
+ ;; the SBCL alpha port or what? Do we need to worry about it,
+ ;; or can we delete it?
+ 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))
projects / sbcl.git / blobdiff