;;; pathname), or NIL if we're not currently cold loading any object file
(defvar *cold-load-filename* nil)
(declaim (type (or string null) *cold-load-filename*))
-
-;;; This is vestigial support for the CMU CL byte-swapping code. CMU
-;;; CL code tested for whether it needed to swap bytes in GENESIS by
-;;; comparing the byte order of *BACKEND* to the byte order of
-;;; *NATIVE-BACKEND*, a concept which doesn't exist in SBCL. Instead,
-;;; in SBCL byte order swapping would need to be explicitly requested
-;;; with a &KEY argument to GENESIS.
-;;;
-;;; I'm not sure whether this is a problem or not, and I don't have a
-;;; machine with different byte order to test to find out for sure.
-;;; The version of the system which is fed to the cross-compiler is
-;;; now written in a subset of Common Lisp which doesn't require
-;;; dumping a lot of things in such a way that machine byte order
-;;; matters. (Mostly this is a matter of not using any specialized
-;;; array type unless there's portable, high-level code to dump it.)
-;;; If it *is* a problem, and you're trying to resurrect this code,
-;;; please test particularly carefully, since I haven't had a chance
-;;; to test the byte-swapping code at all. -- WHN 19990816
-;;;
-;;; When this variable is non-NIL, byte-swapping is enabled wherever
-;;; classic GENESIS would have done it. I.e. the value of this variable
-;;; is the logical complement of
-;;; (EQ (SB!C:BACKEND-BYTE-ORDER SB!C:*NATIVE-BACKEND*)
-;;; (SB!C:BACKEND-BYTE-ORDER SB!C:*BACKEND*))
-;;; from CMU CL.
-(defvar *genesis-byte-order-swap-p*)
\f
;;;; miscellaneous stuff to read and write the core memory
"Push THING onto the given cold-load LIST."
`(setq ,list (cold-cons ,thing ,list)))
-(defun maybe-byte-swap (word)
- (declare (type (unsigned-byte 32) word))
- (aver (= sb!vm:n-word-bits 32))
- (aver (= sb!vm:n-byte-bits 8))
- (if (not *genesis-byte-order-swap-p*)
- word
- (logior (ash (ldb (byte 8 0) word) 24)
- (ash (ldb (byte 8 8) word) 16)
- (ash (ldb (byte 8 16) word) 8)
- (ldb (byte 8 24) word))))
-
-(defun maybe-byte-swap-short (short)
- (declare (type (unsigned-byte 16) short))
- (aver (= sb!vm:n-word-bits 32))
- (aver (= sb!vm:n-byte-bits 8))
- (if (not *genesis-byte-order-swap-p*)
- short
- (logior (ash (ldb (byte 8 0) short) 8)
- (ldb (byte 8 8) short))))
-
;;; BYTE-VECTOR-REF-32 and friends. These are like SAP-REF-n, except
;;; that instead of a SAP we use a byte vector
(macrolet ((make-byte-vector-ref-n
(bytes (gspace-bytes gspace))
(byte-index (ash (+ index (descriptor-word-offset address))
sb!vm:word-shift))
- ;; KLUDGE: Do we really need to do byte swap here? It seems
- ;; as though we shouldn't.. (This attempts to be a literal
- ;; translation of CMU CL code, and I don't have a big-endian
- ;; machine to test it.) -- WHN 19990817
- (value (maybe-byte-swap (byte-vector-ref-32 bytes byte-index))))
+ (value (byte-vector-ref-32 bytes byte-index)))
(make-random-descriptor value)))
(declaim (ftype (function (descriptor) descriptor) read-memory))
sb!vm:lowtag-mask)
(ash index sb!vm:word-shift))
value)
- ;; Note: There's a MAYBE-BYTE-SWAP in here in CMU CL, which I
- ;; think is unnecessary now that we're doing the write
- ;; byte-by-byte at high level. (I can't test this, though..) --
- ;; WHN 19990817
(let* ((bytes (gspace-bytes (descriptor-intuit-gspace address)))
(byte-index (ash (+ index (descriptor-word-offset address))
sb!vm:word-shift)))
(setf (byte-vector-ref-32 bytes byte-index)
- (maybe-byte-swap (descriptor-bits value))))))
+ (descriptor-bits value)))))
(declaim (ftype (function (descriptor descriptor)) write-memory))
(defun write-memory (address value)
;;; the executable which will load the core.
;;; MAP-FILE-NAME gets (?) a map file. (dunno about this -- WHN 19990815)
;;;
-;;; other arguments:
-;;; BYTE-ORDER-SWAP-P controls whether GENESIS tries to swap bytes
-;;; in some places in the output. It's only appropriate when
-;;; cross-compiling from a machine with one byte order to a
-;;; machine with the opposite byte order, which is irrelevant in
-;;; current (19990816) SBCL, since only the X86 architecture is
-;;; supported. If you're trying to add support for more
-;;; architectures, see the comments on DEFVAR
-;;; *GENESIS-BYTE-ORDER-SWAP-P* for more information.
-;;;
;;; FIXME: GENESIS doesn't belong in SB!VM. Perhaps in %KERNEL for now,
;;; perhaps eventually in SB-LD or SB-BOOT.
(defun sb!vm:genesis (&key
symbol-table-file-name
core-file-name
map-file-name
- c-header-file-name
- byte-order-swap-p)
+ c-header-file-name)
(when (and core-file-name
(not symbol-table-file-name))
(let* ((*foreign-symbol-placeholder-value* (if core-file-name nil 0))
(*load-time-value-counter* 0)
- (*genesis-byte-order-swap-p* byte-order-swap-p)
(*cold-fdefn-objects* (make-hash-table :test 'equal))
(*cold-symbols* (make-hash-table :test 'equal))
(*cold-package-symbols* nil)
projects / sbcl.git / blobdiff