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 (%primitive sb!kernel::code-instructions code)))
  46      (ecase kind
  47        (:b
  48         (error "Can't deal with CALL fixups, yet."))
  49        (:ba
  50         (setf (ldb (byte 24 2) (sap-ref-32 sap offset))
  51               (ash fixup -2)))
  52        (:ha
  53         (let* ((h (ldb (byte 16 16) fixup))
  54                (l (ldb (byte 16 0) fixup)))
  55           ; Compensate for possible sign-extension when the low half
  56           ; is added to the high.  We could avoid this by ORI-ing
  57           ; the low half in 32-bit absolute loads, but it'd be
  58           ; nice to be able to do:
  59           ;  lis rX,foo@ha
  60           ;  lwz rY,foo@l(rX)
  61           ; and lwz/stw and friends all use a signed 16-bit offset.
  62           (setf (ldb (byte 16 0) (sap-ref-32 sap offset))
  63                  (if (logbitp 15 l) (ldb (byte 16 0) (1+ h)) h))))
  64        (:l
  65         (setf (ldb (byte 16 0) (sap-ref-32 sap offset))
  66               (ldb (byte 16 0) fixup)))))))
  67
  68
  69 ;;;; "Sigcontext" access functions, cut & pasted from x86-vm.lisp then
  70 ;;;; hacked for types.
  71
  72 (define-alien-routine ("os_context_pc_addr" context-pc-addr) (* unsigned-long)
  73   (context (* os-context-t)))
  74
  75 (defun context-pc (context)
  76   (declare (type (alien (* os-context-t)) context))
  77   (int-sap (deref (context-pc-addr context))))
  78
  79 (define-alien-routine ("os_context_register_addr" context-register-addr)
  80   (* unsigned-long)
  81   (context (* os-context-t))
  82   (index int))
  83
  84 (defun context-register (context index)
  85   (declare (type (alien (* os-context-t)) context))
  86   (deref (context-register-addr context index)))
  87
  88 (define-alien-routine ("os_context_lr_addr" context-lr-addr) (* unsigned-long)
  89   (context (* os-context-t)))
  90
  91 (defun context-lr (context)
  92   (declare (type (alien (* os-context-t)) context))
  93   (int-sap (deref (context-lr-addr context))))
  94
  95 (defun %set-context-register (context index new)
  96 (declare (type (alien (* os-context-t)) context))
  97 (setf (deref (context-register-addr context index))
  98       new))
  99 ;;; This is like CONTEXT-REGISTER, but returns the value of a float
 100 ;;; register. FORMAT is the type of float to return.
 101
 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 #+nil
 105 (define-alien-routine ("os_context_fpregister_addr" context-float-register-addr)
 106   (* long)
 107   (context (* os-context-t))
 108   (index int))
 109 #+nil
 110 (defun context-float-register (context index format)
 111   (declare (type (alien (* os-context-t)) context))
 112   (coerce (deref (context-float-register-addr context index)) format))
 113 #+nil
 114 (defun %set-context-float-register (context index format new)
 115   (declare (type (alien (* os-context-t)) context))
 116   (setf (deref (context-float-register-addr context index))
 117         (coerce new format)))
 118
 119 ;;; Given a signal context, return the floating point modes word in
 120 ;;; the same format as returned by FLOATING-POINT-MODES.
 121 ;;;
 122 ;;; FIXME: surely this must be accessible somewhere under Darwin?  Or
 123 ;;; under NetBSD?
 124 #!+linux
 125 (define-alien-routine ("os_context_fp_control" context-floating-point-modes)
 126     (sb!alien:unsigned 32)
 127   (context (* os-context-t)))
 128
 129 \f
 130 ;;;; INTERNAL-ERROR-ARGS.
 131
 132 ;;; GIVEN a (POSIX) signal context, extract the internal error
 133 ;;; arguments from the instruction stream.  This is e.g.
 134
 135 ;;; INTERNAL-ERROR-ARGS -- interface.
 136 ;;;
 137 ;;; Given the sigcontext, extract the internal error arguments from the
 138 ;;; instruction stream.
 139 ;;;
 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))))))
 160
 161           (t
 162            (values #.(error-number-or-lose 'unknown-error) nil)))))
 163
 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)
 173     (let* ((index 0)
 174            (error-number (sb!c:read-var-integer vector index)))
 175       (collect ((sc-offsets))
 176                (loop
 177                 (when (>= index length)
 178                   (return))
 179                 (sc-offsets (sb!c:read-var-integer vector index)))
 180                (values error-number (sc-offsets))))))
 181