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.
14 (defvar *number-of-signals* 64)
15 (defvar *bits-per-word* 64)
17 ;;; See x86-vm.lisp for a description of this.
18 (def-alien-type os-context-t (struct os-context-t-struct))
20 ;;;; MACHINE-TYPE and MACHINE-VERSION
22 (defun machine-type ()
23 "Return a string describing the type of the local machine."
25 (defun machine-version ()
26 "Return a string describing the version of the local machine."
29 (defun fixup-code-object (code offset value kind)
30 (unless (zerop (rem offset n-word-bytes))
31 (error "Unaligned instruction? offset=#x~X." offset))
33 (let ((sap (truly-the system-area-pointer
34 (%primitive sb!kernel::code-instructions code))))
37 (assert (zerop (ldb (byte 2 0) value)))
39 (setf (sap-ref-16 sap offset)
40 (logior (sap-ref-16 sap offset) (ldb (byte 14 0) (ash value -2)))))
42 (let* ((value (if (logbitp 15 value) (+ value (ash 1 16)) value))
43 (value (if (logbitp 31 value) (+ value (ash 1 32)) value))
44 (value (if (logbitp 47 value) (+ value (ash 1 48)) value)))
45 (setf (sap-ref-8 sap offset) (ldb (byte 8 48) value))
46 (setf (sap-ref-8 sap (1+ offset)) (ldb (byte 8 56) value))))
48 (let* ((value (if (logbitp 15 value) (+ value (ash 1 16)) value))
49 (value (if (logbitp 31 value) (+ value (ash 1 32)) value)))
50 (setf (sap-ref-8 sap offset) (ldb (byte 8 32) value))
51 (setf (sap-ref-8 sap (1+ offset)) (ldb (byte 8 40) value))))
53 (let ((value (if (logbitp 15 value) (+ value (ash 1 16)) value)))
54 (setf (sap-ref-8 sap offset) (ldb (byte 8 16) value))
55 (setf (sap-ref-8 sap (1+ offset)) (ldb (byte 8 24) value))))
57 (setf (sap-ref-8 sap offset) (ldb (byte 8 0) value))
58 (setf (sap-ref-8 sap (1+ offset)) (ldb (byte 8 8) value)))))))
60 ;;;; "Sigcontext" access functions, cut & pasted from x86-vm.lisp then
61 ;;;; hacked for types.
63 ;;;; KLUDGE: The alpha has 64-bit registers, so these potentially
64 ;;;; return 64 bit numbers (which means bignums ... ew) We think that
65 ;;;; 99 times of 100 (i.e. unless something is badly wrong) we'll get
66 ;;;; answers that fit in 32 bits anyway. Which probably won't help us
67 ;;;; stop passing bignums around as the compiler can't prove they fit
68 ;;;; in 32 bits. But maybe the stuff it does on x86 to unbox 32-bit
69 ;;;; constants happens magically for 64-bit constants here. Just
70 ;;;; maybe. -- Dan Barlow, ca. 2001-05-05
72 ;;;; See also x86-vm for commentary on signed vs unsigned.
74 (def-alien-routine ("os_context_pc_addr" context-pc-addr) (* unsigned-long)
75 (context (* os-context-t)))
77 (defun context-pc (context)
78 (declare (type (alien (* os-context-t)) context))
79 (int-sap (deref (context-pc-addr context))))
81 (def-alien-routine ("os_context_register_addr" context-register-addr)
83 (context (* os-context-t))
86 ;;; FIXME: Should this and CONTEXT-PC be INLINE to reduce consing?
87 ;;; (Are they used in anything time-critical, or just the debugger?)
88 (defun context-register (context index)
89 (declare (type (alien (* os-context-t)) context))
90 (deref (the (alien (* unsigned-long))
91 (context-register-addr context index))))
93 (defun %set-context-register (context index new)
94 (declare (type (alien (* os-context-t)) context))
95 (setf (deref (the (alien (* unsigned-long))
96 (context-register-addr context index)))
99 ;;; This is like CONTEXT-REGISTER, but returns the value of a float
100 ;;; register. FORMAT is the type of float to return.
102 ;;; FIXME: Whether COERCE actually knows how to make a float out of a
103 ;;; long is another question. This stuff still needs testing.
104 (def-alien-routine ("os_context_fpregister_addr" context-float-register-addr)
106 (context (* os-context-t))
108 (defun context-float-register (context index format)
109 (declare (type (alien (* os-context-t)) context))
110 (coerce (deref (context-float-register-addr context index)) format))
111 (defun %set-context-float-register (context index format new)
112 (declare (type (alien (* os-context-t)) context))
113 (setf (deref (context-float-register-addr context index))
114 (coerce new format)))
116 ;;; Given a signal context, return the floating point modes word in
117 ;;; the same format as returned by FLOATING-POINT-MODES.
118 (defun context-floating-point-modes (context)
119 ;; FIXME: As of sbcl-0.6.7 and the big rewrite of signal handling for
120 ;; POSIXness and (at the Lisp level) opaque signal contexts,
121 ;; this is stubified. It needs to be rewritten as an
123 (warn "stub CONTEXT-FLOATING-POINT-MODES")
125 ;; old code for Linux:
127 (let ((cw (slot (deref (slot context 'fpstate) 0) 'cw))
128 (sw (slot (deref (slot context 'fpstate) 0) 'sw)))
129 ;;(format t "cw = ~4X~%sw = ~4X~%" cw sw)
130 ;; NOT TESTED -- Clear sticky bits to clear interrupt condition.
131 (setf (slot (deref (slot context 'fpstate) 0) 'sw) (logandc2 sw #x3f))
132 ;;(format t "new sw = ~X~%" (slot (deref (slot context 'fpstate) 0) 'sw))
133 ;; Simulate floating-point-modes VOP.
134 (logior (ash (logand sw #xffff) 16) (logxor (logand cw #xffff) #x3f)))
138 ;;;; INTERNAL-ERROR-ARGUMENTS
140 ;;; Given a (POSIX) signal context, extract the internal error
141 ;;; arguments from the instruction stream. This is e.g.
142 ;;; 4 23 254 240 2 0 0 0
143 ;;; | ~~~~~~~~~~~~~~~~~~~~~~~~~
144 ;;; length data (everything is an octet)
146 ;;; (example from undefined_tramp: "(gdb) x/40ub 0x10148" for yourself
148 (defun internal-error-arguments (context)
149 (declare (type (alien (* os-context-t)) context))
150 (let ((pc (context-pc context)))
151 (declare (type system-area-pointer pc))
152 ;; pc is a SAP pointing at - or actually, shortly after -
153 ;; the instruction that got us into this mess in the first place
154 (let* ((length (sap-ref-8 pc 4))
155 (vector (make-array length :element-type '(unsigned-byte 8))))
156 (declare (type (unsigned-byte 8) length)
157 (type (simple-array (unsigned-byte 8) (*)) vector))
158 (copy-from-system-area pc (* n-byte-bits 5)
159 vector (* n-word-bits vector-data-offset)
160 (* length n-byte-bits))
162 (error-number (sb!c::read-var-integer vector index)))
163 (collect ((sc-offsets))
165 (when (>= index length)
167 (sc-offsets (sb!c::read-var-integer vector index)))
168 (values error-number (sc-offsets)))))))
170 ;;; The loader uses this to convert alien names to the form they
171 ;;; occure in the symbol table (for example, prepending an
173 (defun extern-alien-name (name)
174 (declare (type simple-base-string name))
175 ;; On the Alpha we don't do anything.
178 ;;;; Do whatever is necessary to make the given code component
181 ;;;; XXX do we really not have to flush caches or something here? I
182 ;;;; need an architecture manual
183 (defun sanctify-for-execution (component)
184 (declare (ignore component))