1 ;;; This file contains the PPC specific runtime stuff.
5 (define-alien-type os-context-t (struct os-context-t-struct))
8 ;;;; MACHINE-TYPE and MACHINE-VERSION
10 (defun machine-type ()
11 "Returns a string describing the type of the local machine."
14 ;;; support for CL:MACHINE-VERSION defined OAOO elsewhere
15 (defun get-machine-version ()
17 (with-open-file (stream "/proc/cpuinfo"
18 ;; /proc is optional even in Linux, so
20 :if-does-not-exist nil)
21 (loop with line while (setf line (read-line stream nil))
22 ;; hoping "cpu" exists and gives something useful in
23 ;; all relevant Linuxen...
25 ;; from Lars Brinkhoff sbcl-devel 26 Jun 2003:
26 ;; I examined different versions of Linux/PPC at
27 ;; http://lxr.linux.no/ (the file that outputs
28 ;; /proc/cpuinfo is arch/ppc/kernel/setup.c, if
29 ;; you want to check), and all except 2.0.x
30 ;; seemed to do the same thing as far as the
31 ;; "cpu" field is concerned, i.e. it always
32 ;; starts with the (C-syntax) string "cpu\t\t: ".
33 when (eql (search "cpu" line) 0)
34 return (string-trim " " (subseq line (1+ (position #\: line))))))
38 ;;;; FIXUP-CODE-OBJECT
40 (defun fixup-code-object (code offset fixup kind)
41 (declare (type index offset))
42 (unless (zerop (rem offset n-word-bytes))
43 (error "Unaligned instruction? offset=#x~X." offset))
45 (let ((sap (truly-the system-area-pointer
46 (%primitive sb!kernel::code-instructions code))))
49 (error "Can't deal with CALL fixups, yet."))
51 (setf (ldb (byte 24 2) (sap-ref-32 sap offset))
54 (let* ((h (ldb (byte 16 16) fixup))
55 (l (ldb (byte 16 0) fixup)))
56 ; Compensate for possible sign-extension when the low half
57 ; is added to the high. We could avoid this by ORI-ing
58 ; the low half in 32-bit absolute loads, but it'd be
59 ; nice to be able to do:
62 ; and lwz/stw and friends all use a signed 16-bit offset.
63 (setf (ldb (byte 16 0) (sap-ref-32 sap offset))
64 (if (logbitp 15 l) (ldb (byte 16 0) (1+ h)) h))))
66 (setf (ldb (byte 16 0) (sap-ref-32 sap offset))
67 (ldb (byte 16 0) fixup)))))))
70 ;;;; "Sigcontext" access functions, cut & pasted from x86-vm.lisp then
71 ;;;; hacked for types.
73 (define-alien-routine ("os_context_pc_addr" context-pc-addr) (* unsigned-long)
74 (context (* os-context-t)))
76 (defun context-pc (context)
77 (declare (type (alien (* os-context-t)) context))
78 (int-sap (deref (context-pc-addr context))))
80 (define-alien-routine ("os_context_register_addr" context-register-addr)
82 (context (* os-context-t))
85 (defun context-register (context index)
86 (declare (type (alien (* os-context-t)) context))
87 (deref (context-register-addr context index)))
89 (define-alien-routine ("os_context_lr_addr" context-lr-addr) (* unsigned-long)
90 (context (* os-context-t)))
92 (defun context-lr (context)
93 (declare (type (alien (* os-context-t)) context))
94 (int-sap (deref (context-lr-addr context))))
96 (defun %set-context-register (context index new)
97 (declare (type (alien (* os-context-t)) context))
98 (setf (deref (context-register-addr context index))
100 ;;; This is like CONTEXT-REGISTER, but returns the value of a float
101 ;;; register. FORMAT is the type of float to return.
103 ;;; FIXME: Whether COERCE actually knows how to make a float out of a
104 ;;; long is another question. This stuff still needs testing.
106 (define-alien-routine ("os_context_fpregister_addr" context-float-register-addr)
108 (context (* os-context-t))
111 (defun context-float-register (context index format)
112 (declare (type (alien (* os-context-t)) context))
113 (coerce (deref (context-float-register-addr context index)) format))
115 (defun %set-context-float-register (context index format new)
116 (declare (type (alien (* os-context-t)) context))
117 (setf (deref (context-float-register-addr context index))
118 (coerce new format)))
120 ;;; Given a signal context, return the floating point modes word in
121 ;;; the same format as returned by FLOATING-POINT-MODES.
123 ;;; FIXME: surely this must be accessible somewhere under Darwin?
125 (define-alien-routine ("os_context_fp_control" context-floating-point-modes)
126 (sb!alien:unsigned 32)
127 (context (* os-context-t)))
130 ;;;; INTERNAL-ERROR-ARGS.
132 ;;; GIVEN a (POSIX) signal context, extract the internal error
133 ;;; arguments from the instruction stream. This is e.g.
135 ;;; INTERNAL-ERROR-ARGS -- interface.
137 ;;; Given the sigcontext, extract the internal error arguments from the
138 ;;; instruction stream.
140 (defun internal-error-args (context)
141 (declare (type (alien (* os-context-t)) context))
142 (let* ((pc (context-pc context))
143 (bad-inst (sap-ref-32 pc 0))
144 (op (ldb (byte 16 16) bad-inst)))
145 (declare (type system-area-pointer pc))
146 (cond ((= op (logior (ash 3 10) (ash 6 5)))
147 (args-for-unimp-inst context))
148 ((and (= (ldb (byte 6 10) op) 3)
149 (= (ldb (byte 5 5) op) 24))
150 (let* ((regnum (ldb (byte 5 0) op))
151 (prev (sap-ref-32 (int-sap (- (sap-int pc) 4)) 0)))
152 (if (and (= (ldb (byte 6 26) prev) 3)
153 (= (ldb (byte 5 21) prev) 0))
154 (values (ldb (byte 16 0) prev)
155 (list (sb!c::make-sc-offset sb!vm:any-reg-sc-number
156 (ldb (byte 5 16) prev))))
157 (values #.(sb!kernel:error-number-or-lose
158 'sb!kernel:invalid-arg-count-error)
159 (list (sb!c::make-sc-offset sb!vm:any-reg-sc-number regnum))))))
162 (values #.(error-number-or-lose 'unknown-error) nil)))))
164 (defun args-for-unimp-inst (context)
165 (declare (type (alien (* os-context-t)) context))
166 (let* ((pc (context-pc context))
167 (length (sap-ref-8 pc 4))
168 (vector (make-array length :element-type '(unsigned-byte 8))))
169 (declare (type system-area-pointer pc)
170 (type (unsigned-byte 8) length)
171 (type (simple-array (unsigned-byte 8) (*)) vector))
172 (copy-ub8-from-system-area pc 5 vector 0 length)
174 (error-number (sb!c:read-var-integer vector index)))
175 (collect ((sc-offsets))
177 (when (>= index length)
179 (sc-offsets (sb!c:read-var-integer vector index)))
180 (values error-number (sc-offsets))))))