/[cmucl]/src/code/sparc-vm.lisp
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Contents of /src/code/sparc-vm.lisp

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Revision 1.5 - (hide annotations)
Thu Dec 6 17:40:17 1990 UTC (23 years, 4 months ago) by ram
Branch: MAIN
Changes since 1.4: +15 -1 lines
Added SIGCONTEXT-FLOATING-POINT-MODES for finding the floating-point
hardware state when there is a floating-point error.
1 wlott 1.1 ;;; -*- Package: VM -*-
2     ;;;
3     ;;; **********************************************************************
4     ;;; This code was written as part of the Spice Lisp project at
5     ;;; Carnegie-Mellon University, and has been placed in the public domain.
6     ;;; If you want to use this code or any part of Spice Lisp, please contact
7     ;;; Scott Fahlman (FAHLMAN@CMUC).
8     ;;; **********************************************************************
9     ;;;
10 ram 1.5 ;;; $Header: /tiger/var/lib/cvsroots/cmucl/src/code/sparc-vm.lisp,v 1.5 1990/12/06 17:40:17 ram Exp $
11 wlott 1.1 ;;;
12     ;;; This file contains the SPARC specific runtime stuff.
13     ;;;
14     (in-package "SPARC")
15     (use-package "SYSTEM")
16    
17 wlott 1.2 (export '(fixup-code-object internal-error-arguments))
18 wlott 1.1
19    
20     ;;;; Add machine specific features to *features*
21    
22     (pushnew :SPARCstation *features*)
23     (pushnew :sparc *features*)
24     (pushnew :sun4 *features*)
25    
26    
27    
28     ;;; FIXUP-CODE-OBJECT -- Interface
29     ;;;
30     (defun fixup-code-object (code offset fixup kind)
31     (multiple-value-bind (word-offset rem) (truncate offset word-bytes)
32     (unless (zerop rem)
33     (error "Unaligned instruction? offset=#x~X." offset))
34     (system:without-gcing
35     (let ((sap (truly-the system-area-pointer
36     (%primitive c::code-instructions code))))
37     (ecase kind
38     (:call
39     (error "Can't deal with CALL fixups, yet."))
40     (:sethi
41     (setf (ldb (byte 22 0) (sap-ref-32 sap word-offset))
42     (ldb (byte 22 10) fixup)))
43     (:add
44     (setf (ldb (byte 10 0) (sap-ref-32 sap word-offset))
45     (ldb (byte 10 0) fixup))))))))
46 wlott 1.2
47    
48    
49     ;;;; Internal-error-arguments.
50    
51     ;;; INTERNAL-ERROR-ARGUMENTS -- interface.
52     ;;;
53     ;;; Given the sigcontext, extract the internal error arguments from the
54     ;;; instruction stream.
55     ;;;
56 wlott 1.3 (defun internal-error-arguments (sc)
57     (alien-bind ((sc sc mach:sigcontext t))
58 wlott 1.2 (let* ((pc (alien-access (mach:sigcontext-pc (alien-value sc))))
59     (length (sap-ref-8 pc 4))
60     (vector (make-array length :element-type '(unsigned-byte 8))))
61 wlott 1.3 (declare (type system-area-pointer pc)
62     (type (unsigned-byte 8) length)
63 wlott 1.4 (type (simple-array (unsigned-byte 8) (*)) vector))
64 wlott 1.2 (copy-from-system-area pc (* vm:byte-bits 5)
65     vector (* vm:word-bits
66     vm:vector-data-offset)
67     (* length vm:byte-bits))
68     (let* ((index 0)
69     (error-number (c::read-var-integer vector index)))
70     (collect ((sc-offsets))
71     (loop
72     (when (>= index length)
73     (return))
74     (sc-offsets (c::read-var-integer vector index)))
75     (values error-number (sc-offsets)))))))
76 ram 1.5
77    
78     ;;; SIGCONTEXT-FLOATING-POINT-MODES -- Interface
79     ;;;
80     ;;; Given a sigcontext pointer, return the floating point modes word in the
81     ;;; same format as returned by FLOATING-POINT-MODES.
82     ;;;
83     (defun sigcontext-floating-point-modes (scp)
84     (alien-bind ((sc (make-alien 'mach:sigcontext
85     #.(ext:c-sizeof 'mach:sigcontext)
86     scp)
87     mach:sigcontext
88     t))
89     (alien-access (mach:sigcontext-fsr (alien-value sc)))))

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