1 ;;;; Alpha-specific implementation stuff
3 ;;;; This software is part of the SBCL system. See the README file for
6 ;;;; This software is derived from the CMU CL system, which was
7 ;;;; written at Carnegie Mellon University and released into the
8 ;;;; public domain. The software is in the public domain and is
9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
10 ;;;; files for more information.
15 (defun machine-type ()
16 "Return a string describing the type of the local machine."
20 (defun fixup-code-object (code offset value kind
)
21 (unless (zerop (rem offset n-word-bytes
))
22 (error "Unaligned instruction? offset=#x~X." offset
))
24 (let ((sap (code-instructions code
)))
27 (aver (zerop (ldb (byte 2 0) value
)))
29 (setf (sap-ref-16 sap offset
)
30 (logior (sap-ref-16 sap offset
)
31 (ldb (byte 14 0) (ash value -
2)))))
33 (let* ((value (if (logbitp 15 value
) (+ value
(ash 1 16)) value
))
34 (value (if (logbitp 31 value
) (+ value
(ash 1 32)) value
))
35 (value (if (logbitp 47 value
) (+ value
(ash 1 48)) value
)))
36 (setf (sap-ref-8 sap offset
) (ldb (byte 8 48) value
))
37 (setf (sap-ref-8 sap
(1+ offset
)) (ldb (byte 8 56) value
))))
39 (let* ((value (if (logbitp 15 value
) (+ value
(ash 1 16)) value
))
40 (value (if (logbitp 31 value
) (+ value
(ash 1 32)) value
)))
41 (setf (sap-ref-8 sap offset
) (ldb (byte 8 32) value
))
42 (setf (sap-ref-8 sap
(1+ offset
)) (ldb (byte 8 40) value
))))
44 (let ((value (if (logbitp 15 value
) (+ value
(ash 1 16)) value
)))
45 (setf (sap-ref-8 sap offset
) (ldb (byte 8 16) value
))
46 (setf (sap-ref-8 sap
(1+ offset
)) (ldb (byte 8 24) value
))))
48 (setf (sap-ref-8 sap offset
) (ldb (byte 8 0) value
))
49 (setf (sap-ref-8 sap
(1+ offset
)) (ldb (byte 8 8) value
)))
51 (setf (sap-ref-32 sap offset
) value
)))))))
53 ;;;; "sigcontext" access functions, cut & pasted from x86-vm.lisp then
54 ;;;; hacked for types.
56 ;;;; KLUDGE: The alpha has 64-bit registers, so these potentially
57 ;;;; return 64 bit numbers (which means bignums ... ew) We think that
58 ;;;; 99 times of 100 (i.e. unless something is badly wrong) we'll get
59 ;;;; answers that fit in 32 bits anyway. Which probably won't help us
60 ;;;; stop passing bignums around as the compiler can't prove they fit
61 ;;;; in 32 bits. But maybe the stuff it does on x86 to unbox 32-bit
62 ;;;; constants happens magically for 64-bit constants here. Just
63 ;;;; maybe. -- Dan Barlow, ca. 2001-05-05
65 ;;;; See also x86-vm for commentary on signed vs unsigned.
68 ;;; This is like CONTEXT-REGISTER, but returns the value of a float
69 ;;; register. FORMAT is the type of float to return.
71 ;;; FIXME: Whether COERCE actually knows how to make a float out of a
72 ;;; long is another question. This stuff still needs testing.
73 (define-alien-routine ("os_context_float_register_addr"
74 context-float-register-addr
)
76 (context (* os-context-t
))
78 (defun context-float-register (context index format
)
79 (declare (type (alien (* os-context-t
)) context
))
80 (coerce (deref (context-float-register-addr context index
)) format
))
81 (defun %set-context-float-register
(context index format new
)
82 (declare (type (alien (* os-context-t
)) context
))
83 (setf (deref (context-float-register-addr context index
))
86 ;;; This sets the software fp_control word, which is not the same
87 ;;; thing as the hardware fpcr. We have to do this so that OS FPU
88 ;;; completion works properly
90 ;;; Note that this means we can't set rounding modes; we'd have to do
91 ;;; that separately. That said, almost everybody seems to agree that
92 ;;; changing the rounding mode is rarely a good idea, because it upsets
93 ;;; libm functions. So adding that is not a priority. Sorry.
97 ("arch_get_fp_control" floating-point-modes
) (unsigned 64))
100 ("arch_set_fp_control" %floating-point-modes-setter
) void
(fp (unsigned 64)))
102 (defun (setf floating-point-modes
) (val) (%floating-point-modes-setter val
))
104 ;;; Given a signal context, return the floating point modes word in
105 ;;; the same format as returned by FLOATING-POINT-MODES.
106 (define-alien-routine ("os_context_fp_control" context-floating-point-modes
)
107 (unsigned 64) (context (* os-context-t
)))
110 ;;;; INTERNAL-ERROR-ARGS
111 (defun internal-error-args (context)
112 (declare (type (alien (* os-context-t
)) context
))
113 (let* ((pc (context-pc context
))
114 (error-number (sap-ref-8 pc
4)))
115 (declare (type system-area-pointer pc
))
117 (sb!kernel
::decode-internal-error-args
(sap+ pc
5) error-number
))))