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 (defun %set-context-register (context index new)
90 (declare (type (alien (* os-context-t)) context))
91 (setf (deref (context-register-addr context index))
93 ;;; This is like CONTEXT-REGISTER, but returns the value of a float
94 ;;; register. FORMAT is the type of float to return.
96 ;;; FIXME: Whether COERCE actually knows how to make a float out of a
97 ;;; long is another question. This stuff still needs testing.
99 (define-alien-routine ("os_context_fpregister_addr" context-float-register-addr)
101 (context (* os-context-t))
104 (defun context-float-register (context index format)
105 (declare (type (alien (* os-context-t)) context))
106 (coerce (deref (context-float-register-addr context index)) format))
108 (defun %set-context-float-register (context index format new)
109 (declare (type (alien (* os-context-t)) context))
110 (setf (deref (context-float-register-addr context index))
111 (coerce new format)))
113 ;;; Given a signal context, return the floating point modes word in
114 ;;; the same format as returned by FLOATING-POINT-MODES.
116 ;;; FIXME: surely this must be accessible somewhere under Darwin?
118 (define-alien-routine ("os_context_fp_control" context-floating-point-modes)
119 (sb!alien:unsigned 32)
120 (context (* os-context-t)))
123 ;;;; INTERNAL-ERROR-ARGS.
125 ;;; GIVEN a (POSIX) signal context, extract the internal error
126 ;;; arguments from the instruction stream. This is e.g.
128 ;;; INTERNAL-ERROR-ARGS -- interface.
130 ;;; Given the sigcontext, extract the internal error arguments from the
131 ;;; instruction stream.
133 (defun internal-error-args (context)
134 (declare (type (alien (* os-context-t)) context))
135 (let* ((pc (context-pc context))
136 (bad-inst (sap-ref-32 pc 0))
137 (op (ldb (byte 16 16) bad-inst)))
138 (declare (type system-area-pointer pc))
139 (cond ((= op (logior (ash 3 10) (ash 6 5)))
140 (args-for-unimp-inst context))
141 ((and (= (ldb (byte 6 10) op) 3)
142 (= (ldb (byte 5 5) op) 24))
143 (let* ((regnum (ldb (byte 5 0) op))
144 (prev (sap-ref-32 (int-sap (- (sap-int pc) 4)) 0)))
145 (if (and (= (ldb (byte 6 26) prev) 3)
146 (= (ldb (byte 5 21) prev) 0))
147 (values (ldb (byte 16 0) prev)
148 (list (sb!c::make-sc-offset sb!vm:any-reg-sc-number
149 (ldb (byte 5 16) prev))))
150 (values #.(sb!kernel:error-number-or-lose
151 'sb!kernel:invalid-arg-count-error)
152 (list (sb!c::make-sc-offset sb!vm:any-reg-sc-number regnum))))))
155 (values #.(error-number-or-lose 'unknown-error) nil)))))
157 (defun args-for-unimp-inst (context)
158 (declare (type (alien (* os-context-t)) context))
159 (let* ((pc (context-pc context))
160 (length (sap-ref-8 pc 4))
161 (vector (make-array length :element-type '(unsigned-byte 8))))
162 (declare (type system-area-pointer pc)
163 (type (unsigned-byte 8) length)
164 (type (simple-array (unsigned-byte 8) (*)) vector))
165 (copy-from-system-area pc (* sb!vm:n-byte-bits 5)
166 vector (* sb!vm:n-word-bits
167 sb!vm:vector-data-offset)
168 (* length sb!vm:n-byte-bits))
170 (error-number (sb!c:read-var-integer vector index)))
171 (collect ((sc-offsets))
173 (when (>= index length)
175 (sc-offsets (sb!c:read-var-integer vector index)))
176 (values error-number (sc-offsets))))))