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
   9
  10 (defun machine-type ()
  11   "Returns a string describing the type of the local machine."
  12   "PowerPC")
  13 \f
  14 ;;;; FIXUP-CODE-OBJECT
  15
  16 (defun fixup-code-object (code offset fixup kind)
  17   (declare (type index offset))
  18   (unless (zerop (rem offset n-word-bytes))
  19     (error "Unaligned instruction?  offset=#x~X." offset))
  20   (without-gcing
  21    (let ((sap (%primitive code-instructions code)))
  22      (ecase kind
  23        (:absolute
  24         (setf (sap-ref-32 sap offset) fixup))
  25        (:b
  26         (error "Can't deal with CALL fixups, yet."))
  27        (:ba
  28         (setf (ldb (byte 24 2) (sap-ref-32 sap offset))
  29               (ash fixup -2)))
  30        (:ha
  31         (let* ((h (ldb (byte 16 16) fixup))
  32                (l (ldb (byte 16 0) fixup)))
  33           ; Compensate for possible sign-extension when the low half
  34           ; is added to the high.  We could avoid this by ORI-ing
  35           ; the low half in 32-bit absolute loads, but it'd be
  36           ; nice to be able to do:
  37           ;  lis rX,foo@ha
  38           ;  lwz rY,foo@l(rX)
  39           ; and lwz/stw and friends all use a signed 16-bit offset.
  40           (setf (ldb (byte 16 0) (sap-ref-32 sap offset))
  41                  (if (logbitp 15 l) (ldb (byte 16 0) (1+ h)) h))))
  42        (:l
  43         (setf (ldb (byte 16 0) (sap-ref-32 sap offset))
  44               (ldb (byte 16 0) fixup)))))))
  45
  46
  47 ;;;; "Sigcontext" access functions, cut & pasted from x86-vm.lisp then
  48 ;;;; hacked for types.
  49
  50 (define-alien-routine ("os_context_pc_addr" context-pc-addr) (* unsigned-long)
  51   (context (* os-context-t)))
  52
  53 (defun context-pc (context)
  54   (declare (type (alien (* os-context-t)) context))
  55   (int-sap (deref (context-pc-addr context))))
  56
  57 (define-alien-routine ("os_context_register_addr" context-register-addr)
  58   (* unsigned-long)
  59   (context (* os-context-t))
  60   (index int))
  61
  62 (defun context-register (context index)
  63   (declare (type (alien (* os-context-t)) context))
  64   (deref (context-register-addr context index)))
  65
  66 (define-alien-routine ("os_context_lr_addr" context-lr-addr) (* unsigned-long)
  67   (context (* os-context-t)))
  68
  69 (defun context-lr (context)
  70   (declare (type (alien (* os-context-t)) context))
  71   (int-sap (deref (context-lr-addr context))))
  72
  73 (defun %set-context-register (context index new)
  74 (declare (type (alien (* os-context-t)) context))
  75 (setf (deref (context-register-addr context index))
  76       new))
  77 ;;; This is like CONTEXT-REGISTER, but returns the value of a float
  78 ;;; register. FORMAT is the type of float to return.
  79
  80 ;;; FIXME: Whether COERCE actually knows how to make a float out of a
  81 ;;; long is another question. This stuff still needs testing.
  82 #+nil
  83 (define-alien-routine ("os_context_fpregister_addr" context-float-register-addr)
  84   (* long)
  85   (context (* os-context-t))
  86   (index int))
  87 #+nil
  88 (defun context-float-register (context index format)
  89   (declare (type (alien (* os-context-t)) context))
  90   (coerce (deref (context-float-register-addr context index)) format))
  91 #+nil
  92 (defun %set-context-float-register (context index format new)
  93   (declare (type (alien (* os-context-t)) context))
  94   (setf (deref (context-float-register-addr context index))
  95         (coerce new format)))
  96
  97 ;;; Given a signal context, return the floating point modes word in
  98 ;;; the same format as returned by FLOATING-POINT-MODES.
  99 ;;;
 100 ;;; FIXME: surely this must be accessible somewhere under Darwin?  Or
 101 ;;; under NetBSD?
 102 #!+linux
 103 (define-alien-routine ("os_context_fp_control" context-floating-point-modes)
 104     (unsigned 32)
 105   (context (* os-context-t)))
 106
 107 \f
 108 ;;;; INTERNAL-ERROR-ARGS.
 109
 110 ;;; GIVEN a (POSIX) signal context, extract the internal error
 111 ;;; arguments from the instruction stream.  This is e.g.
 112
 113 ;;; INTERNAL-ERROR-ARGS -- interface.
 114 ;;;
 115 ;;; Given the sigcontext, extract the internal error arguments from the
 116 ;;; instruction stream.
 117 ;;;
 118 (defun internal-error-args (context)
 119   (declare (type (alien (* os-context-t)) context))
 120   (let* ((pc (context-pc context))
 121          (bad-inst (sap-ref-32 pc 0))
 122          (op (ldb (byte 16 16) bad-inst))
 123          (regnum (ldb (byte 5 0) op)))
 124     (declare (type system-area-pointer pc))
 125     (cond ((= op (logior (ash 3 10) (ash 6 5)))
 126            (let ((error-number (sap-ref-8 pc 4)))
 127              (values error-number
 128                      (sb!kernel::decode-internal-error-args (sap+ pc 5) error-number))))
 129           #!-precise-arg-count-error
 130           ((and (= (ldb (byte 6 10) op) 3)
 131                 (= (ldb (byte 5 5) op) 24))
 132            (let ((prev (sap-ref-32 (int-sap (- (sap-int pc) 4)) 0)))
 133              (if (and (= (ldb (byte 6 26) prev) 3)
 134                       (= (ldb (byte 5 21) prev) 0))
 135                  (values (ldb (byte 16 0) prev)
 136                          (list (make-sc-offset any-reg-sc-number
 137                                                (ldb (byte 5 16) prev))))
 138                  (values #.(error-number-or-lose
 139                             'invalid-arg-count-error)
 140                          (list (make-sc-offset any-reg-sc-number regnum))))))
 141           #!+precise-arg-count-error
 142           ((and (= (ldb (byte 6 10) op) 3) ;; twi
 143                 (or (= regnum #.(sc-offset-offset arg-count-sc))
 144                     (= (ldb (byte 5 5) op) 24))) ;; :ne
 145            ;; Type errors are encoded as
 146            ;; twi 0 value-register error-code
 147            ;; twi :ne temp-register x
 148            (let ((prev (sap-ref-32 (int-sap (- (sap-int pc) 4)) 0)))
 149              (if (and (= (ldb (byte 5 5) op) 24) ;; is the condition :ne?
 150                       (= (ldb (byte 6 26) prev) 3) ;; is it twi?
 151                       (= (ldb (byte 5 21) prev) 0)) ;; is it non-trapping?
 152                  (values (ldb (byte 16 0) prev)
 153                          (list (make-sc-offset any-reg-sc-number
 154                                                (ldb (byte 5 16) prev))))
 155                  ;; arg-count errors are encoded as
 156                  ;; twi {:ne :llt :lgt} nargs arg-count
 157                  (values #.(error-number-or-lose 'invalid-arg-count-error)
 158                          '(#.arg-count-sc)))))
 159           (t
 160            (values #.(error-number-or-lose 'unknown-error) nil)))))
 161