src/code/ppc-vm.lisp

   1 ;;; This file contains the PPC specific runtime stuff.
   2 ;;;
   3 (in-package "SB!VM")
   4
   5 (define-alien-type os-context-t (struct os-context-t-struct))
   6
   7 \f
   8 ;;;; MACHINE-TYPE and MACHINE-VERSION
   9
  10 (defun machine-type ()
  11   "Returns a string describing the type of the local machine."
  12   "PowerPC")
  13
  14 ;;; support for CL:MACHINE-VERSION defined OAOO elsewhere
  15 (defun get-machine-version ()
  16   #!+linux
  17   (with-open-file (stream "/proc/cpuinfo"
  18                           ;; /proc is optional even in Linux, so
  19                           ;; fail gracefully.
  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...
  24           ;;
  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))))))
  35   #!-linux
  36   nil)
  37 \f
  38 ;;;; FIXUP-CODE-OBJECT
  39
  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))
  44   (sb!sys:without-gcing
  45    (let ((sap (truly-the system-area-pointer
  46                          (%primitive sb!kernel::code-instructions code))))
  47      (ecase kind
  48        (:b
  49         (error "Can't deal with CALL fixups, yet."))
  50        (:ba
  51         (setf (ldb (byte 24 2) (sap-ref-32 sap offset))
  52               (ash fixup -2)))
  53        (:ha
  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:
  60           ;  lis rX,foo@ha
  61           ;  lwz rY,foo@l(rX)
  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))))
  65        (:l
  66         (setf (ldb (byte 16 0) (sap-ref-32 sap offset))
  67               (ldb (byte 16 0) fixup)))))))
  68
  69
  70 ;;;; "Sigcontext" access functions, cut & pasted from x86-vm.lisp then
  71 ;;;; hacked for types.
  72
  73 (define-alien-routine ("os_context_pc_addr" context-pc-addr) (* unsigned-long)
  74   (context (* os-context-t)))
  75
  76 (defun context-pc (context)
  77   (declare (type (alien (* os-context-t)) context))
  78   (int-sap (deref (context-pc-addr context))))
  79
  80 (define-alien-routine ("os_context_register_addr" context-register-addr)
  81   (* unsigned-long)
  82   (context (* os-context-t))
  83   (index int))
  84
  85 (defun context-register (context index)
  86   (declare (type (alien (* os-context-t)) context))
  87   (deref (context-register-addr context index)))
  88
  89 (define-alien-routine ("os_context_lr_addr" context-lr-addr) (* unsigned-long)
  90   (context (* os-context-t)))
  91
  92 (defun context-lr (context)
  93   (declare (type (alien (* os-context-t)) context))
  94   (int-sap (deref (context-lr-addr context))))
  95
  96 (defun %set-context-register (context index new)
  97 (declare (type (alien (* os-context-t)) context))
  98 (setf (deref (context-register-addr context index))
  99       new))
 100 ;;; This is like CONTEXT-REGISTER, but returns the value of a float
 101 ;;; register. FORMAT is the type of float to return.
 102
 103 ;;; FIXME: Whether COERCE actually knows how to make a float out of a
 104 ;;; long is another question. This stuff still needs testing.
 105 #+nil
 106 (define-alien-routine ("os_context_fpregister_addr" context-float-register-addr)
 107   (* long)
 108   (context (* os-context-t))
 109   (index int))
 110 #+nil
 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))
 114 #+nil
 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)))
 119
 120 ;;; Given a signal context, return the floating point modes word in
 121 ;;; the same format as returned by FLOATING-POINT-MODES.
 122 ;;;
 123 ;;; FIXME: surely this must be accessible somewhere under Darwin?  Or
 124 ;;; under NetBSD?
 125 #!+linux
 126 (define-alien-routine ("os_context_fp_control" context-floating-point-modes)
 127     (sb!alien:unsigned 32)
 128   (context (* os-context-t)))
 129
 130 \f
 131 ;;;; INTERNAL-ERROR-ARGS.
 132
 133 ;;; GIVEN a (POSIX) signal context, extract the internal error
 134 ;;; arguments from the instruction stream.  This is e.g.
 135
 136 ;;; INTERNAL-ERROR-ARGS -- interface.
 137 ;;;
 138 ;;; Given the sigcontext, extract the internal error arguments from the
 139 ;;; instruction stream.
 140 ;;;
 141 (defun internal-error-args (context)
 142   (declare (type (alien (* os-context-t)) context))
 143   (let* ((pc (context-pc context))
 144          (bad-inst (sap-ref-32 pc 0))
 145          (op (ldb (byte 16 16) bad-inst)))
 146     (declare (type system-area-pointer pc))
 147     (cond ((= op (logior (ash 3 10) (ash 6 5)))
 148            (args-for-unimp-inst context))
 149           ((and (= (ldb (byte 6 10) op) 3)
 150                 (= (ldb (byte 5 5) op) 24))
 151            (let* ((regnum (ldb (byte 5 0) op))
 152                   (prev (sap-ref-32 (int-sap (- (sap-int pc) 4)) 0)))
 153              (if (and (= (ldb (byte 6 26) prev) 3)
 154                       (= (ldb (byte 5 21) prev) 0))
 155                  (values (ldb (byte 16 0) prev)
 156                          (list (sb!c::make-sc-offset sb!vm:any-reg-sc-number
 157                                                      (ldb (byte 5 16) prev))))
 158                  (values #.(sb!kernel:error-number-or-lose
 159                             'sb!kernel:invalid-arg-count-error)
 160                          (list (sb!c::make-sc-offset sb!vm:any-reg-sc-number regnum))))))
 161
 162           (t
 163            (values #.(error-number-or-lose 'unknown-error) nil)))))
 164
 165 (defun args-for-unimp-inst (context)
 166   (declare (type (alien (* os-context-t)) context))
 167   (let* ((pc (context-pc context))
 168          (length (sap-ref-8 pc 4))
 169          (vector (make-array length :element-type '(unsigned-byte 8))))
 170     (declare (type system-area-pointer pc)
 171              (type (unsigned-byte 8) length)
 172              (type (simple-array (unsigned-byte 8) (*)) vector))
 173     (copy-ub8-from-system-area pc 5 vector 0 length)
 174     (let* ((index 0)
 175            (error-number (sb!c:read-var-integer vector index)))
 176       (collect ((sc-offsets))
 177                (loop
 178                 (when (>= index length)
 179                   (return))
 180                 (sc-offsets (sb!c:read-var-integer vector index)))
 181                (values error-number (sc-offsets))))))
 182